Method and communication device for monitoring control information

Abstract

The present application provides a method and communication device for monitoring control information. In this method, if a first condition is met, a first device can release the DRX function of the first device, and the first device does not need to monitor the control information based on the DRX function of the first device. In this way, the first device's monitoring of first control information sent by the second device is not restricted by the activation time of the DRX function of the first device, and can monitor the first control information sent by the second device at any time, thereby reducing latency.

Description

Technical Field

[0001] The present application relates to the field of communications, and more particularly to a method and a communication device for monitoring control information in the field of communications. Background Art

[0002] In existing communication systems, in order to reduce device power consumption, a discontinuous reception (DRX) function can be defined. The device can receive information during the activation time of the DRX function and not receive information during the inactivation time of the DRX function. In this way, the power consumption of the device can be reduced.

[0003] However, some devices may not be able to receive information during the DRX inactive period, which may result in failure to meet transmission latency requirements. This is especially true when the DRX inactive period is long and the device has high transmission latency requirements. Summary of the Invention

[0004] The embodiments of the present application provide a method and a communication device for monitoring control information, which can reduce transmission delay and help meet transmission requirements.

[0005] In a first aspect, a method for monitoring control information is provided, which is applicable to a first device, and includes: if a first condition is met, releasing a discontinuous reception (DRX) function of the first device, wherein the DRX function enables the first device to monitor control information within an activation time of discontinuous reception; and monitoring first control information sent by a second device, wherein the first control information is used to schedule a data channel.

[0006] In the above scheme, if the first condition is met, the first device can release the DRX function of the first device, and the first device does not need to monitor the control information according to the DRX function of the first device. In this way, the first device monitors the first control information sent by the second device without being restricted by the activation time of the DRX function of the first device, and can monitor the first control information sent by the second device at any time, thereby reducing the delay and helping to meet the transmission requirements.

[0007] Optionally, the method also includes: receiving a data channel from the second device according to the first control information, the data channel is used to carry the second message for entering the RRC connection state, thereby reducing the delay in entering the RRC connection state, for example, the data channel is used to carry the second message for the remote terminal device to enter the RRC connection state.

[0008] Optionally, monitoring the first control information sent by the second device includes: in response to releasing a discontinuous reception (DRX) function of the first device, monitoring the first control information sent by the second device.

[0009] Optionally, the DRX function of the first device is that the first device monitors control information during an activation time of discontinuous reception, and does not monitor control information during an inactivation time of discontinuous reception.

[0010] Optionally, the first device is a remote terminal device, the second device is a relay terminal device, and the DRX function of the first device is a sidelink (SL) DRX function of the remote terminal device. Optionally, the first control information is sidelink control information (SCI).

[0011] Optionally, the first device is a relay terminal device, the second device is a remote terminal device, and the DRX function of the first device is an SL DRX function of the relay terminal device. Optionally, the first control information is an SCI.

[0012] Optionally, the first device is a relay terminal device, the second device is a network device, and the DRX function of the first device is a Uu DRX function of the relay terminal device. Optionally, the first control information is downlink control information (DCI).

[0013] Optionally, the first condition may implicitly trigger the release of the discontinuous reception (DRX) function of the first device.

[0014] In some possible implementations, the first device is a remote terminal device, and the second device is a relay terminal device; the first condition includes that the first device sends a first message to the network device through the second device; the first message is an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0015] In the above scheme, if the remote terminal device has a DRX function, the remote terminal device can send a first message to the network device through the relay terminal device, triggering the remote terminal device to release the DRX function of the remote terminal device. When the first message is an RRC establishment request message, the delay in establishing the RRC connection can be reduced; when the first message is an RRC recovery request message, the delay in restoring the RRC connection can be reduced; and when the first message is an RRC re-establishment request message, the delay in re-establishing the RRC connection can be reduced.

[0016] Optionally, the DRX function of the remote terminal device may be an SL DRX function of the remote terminal device.

[0017] Optionally, the first device sending the first message to the network device through the second device may include: the first device sending data on a Uu SRBO to the second device, where the data on the Uu SRBO includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message; and the second device sending the data on the Uu SRBO from the first device to the network device.

[0018] In some possible implementations, the method further includes: receiving the data channel from the second device according to the first control information, where the data channel is used to carry the second message;

[0019] In a case where the first message is the RRC establishment request message, the second message is an RRC establishment message of the first device;

[0020] In a case where the first message is the RRC recovery request message, the second message is an RRC recovery message of the first device;

[0021] In a case where the first message is the RRC re-establishment request message, the second message is an RRC re-establishment message of the first device.

[0022] In the above scheme, the remote terminal device sends an RRC establishment request message to the network device through the relay terminal device, triggering the remote terminal device to release the SL DRX function of the remote terminal device. After the remote terminal device releases the SL DRX function of the remote terminal device, the first control information received by the remote terminal device is not restricted by the SL DRX function of the remote terminal device. Since the data channel scheduled by the first control information carries the RRC establishment message sent by the relay terminal device, the time delay for the remote terminal device to establish the RRC connection can be reduced. Or the remote terminal device sends an RRC recovery request message to the network device through the relay terminal device, triggering the remote terminal device to release the SL DRX function of the remote terminal device. After the remote terminal device releases the SL DRX function of the remote terminal device, the first control information received by the remote terminal device is not restricted by the SL DRX function of the remote terminal device. Since the data channel scheduled by the first control information carries the RRC recovery message sent by the relay terminal device, the time delay for the remote terminal device to recover the RRC connection can be reduced. Alternatively, the remote terminal device sends an RRC re-establishment request message to the network device through the relay terminal device, triggering the remote terminal device to release the SL DRX function of the remote terminal device. After the remote terminal device releases the SL DRX function of the remote terminal device, the first control information received by the remote terminal device is not restricted by the SL DRX function of the remote terminal device. Since the data channel scheduled by the first control information carries the RRC re-establishment message of the relay terminal device, the delay for the remote terminal device to re-establish the RRC connection can be reduced.

[0023] Optionally, the RRC establishment message of the first device is an RRC establishment message for the first device to establish an RRC connection. Optionally, the RRC recovery message of the first device is an RRC recovery message for the first device to recover the RRC connection. Optionally, the RRC re-establishment message of the first device is an RRC re-establishment message for the first device to re-establish the RRC connection.

[0024] Optionally, the second message carried by the data channel is used for the second device to enter an RRC connected state.

[0025] Optionally, the data channel is used to carry data on Uu SRB0 when the first device enters the RRC connected state, and the data on Uu SRB0 may include an RRC establishment message. Optionally, the data channel is used to carry data on Uu SRB1 when the first device enters the RRC connected state, and the data on Uu SRB1 may include an RRC recovery message or an RRC re-establishment request message.

[0026] In some possible implementations, the first device is a remote terminal device, and the second device is a relay terminal device;

[0027] The first condition includes the first device receiving first indication information sent by the second device, where the first indication information indicates that a radio link failure RLF between the second device and the network device or a successful RRC connection re-establishment between the second device and the network device.

[0028] In the above scheme, after the RLF between the relay terminal device and the network device, the relay terminal device can indicate to the remote terminal device that the RLF between the relay terminal device and the network device or the RRC connection between the relay terminal device and the network device has been successfully re-established. In this way, when the remote terminal device receives the first indication information, the remote terminal device is triggered to release the SL DRX function of the remote terminal device, thereby reducing the delay for the remote terminal device to re-establish the RRC connection.

[0029] Optionally, after the remote terminal device receives the first indication information, the method further includes: the remote terminal device can send an RRC re-establishment request message to the network device through the relay terminal device, and the remote terminal device can receive the RRC re-establishment message through the relay terminal device, thereby reducing the delay of the remote terminal device in re-establishing the RRC connection. Optionally, the remote terminal device can receive the SCI of the scheduled RRC re-establishment message sent by the relay terminal device, the relay terminal device sends the RRC re-establishment message to the remote terminal device according to the SCI, and the remote terminal device receives the RRC re-establishment message sent by the relay according to the SCI. Among them, the remote terminal device is not restricted by the SL DRX function of the remote terminal device in the process of receiving the SCI of the scheduled RRC re-establishment message, thereby reducing the delay.

[0030] Optionally, the relay terminal device sends an RRC re-establishment message to the remote terminal device, which can be replaced by: the relay terminal device sends data on Uu SRB1 to the remote terminal device, and the data on Uu SRB1 includes the RRC re-establishment message.

[0031] In some possible implementations, the first device is a relay terminal device, and the second device is a remote terminal device; the first condition includes that the first device receives data on a Uu signaling radio bearer SRB0 from the second device; or,

[0032] The first condition includes that the first device sends data on Uu SRBO from the second device to the network device; or

[0033] The first condition includes a first preset time period after the first device receives data from the second device on the Uu SRBO; or

[0034] The first condition includes that the first device receives data sent by the network device on Uu SRBO or Uu SRBl of the second device; or

[0035] The first condition includes that the first device forwards to the second device data sent by a network device over Uu SRBO or data sent over Uu SRBl of the second device.

[0036] Optionally, the DRX function of the first device may be an SL DRX function of a relay terminal device.

[0037] Optionally, the data on the Uu SRBO from the second device includes an RRC establishment request message, an RRC re-establishment request message, or an RRC recovery request message.

[0038] Optionally, the data sent by the network device on the Uu SRB0 of the second device includes an RRC establishment message; optionally, the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message or an RRC re-establishment message.

[0039] In the above scheme, if the relay terminal device receives data on Uu SRB0 from a remote terminal device, it can trigger the relay terminal device to release the SL DRX function of the relay terminal device. Or if the relay terminal device forwards data on Uu SRB0 from a terminal device to a network device, it can trigger the relay terminal device to release the SL DRX function of the relay terminal device. Or after the relay terminal device receives data on Uu SRB0 from a remote terminal device for a first preset time period, it can trigger the relay terminal device to release the SL DRX function of the relay terminal device. Or when the relay terminal device receives data on Uu SRB0 or ​​UuSRB0 sent from a network device to a remote terminal device, it can trigger the relay terminal device to release the SL DRX function of the relay terminal device. Or if the relay terminal device forwards data on Uu SRB0 or ​​Uu SRB1 sent from a network device to a remote terminal device to a remote terminal device, it can trigger the relay terminal device to release the SL DRX function of the relay terminal device. This can reduce latency.

[0040] In some possible implementations, the method further includes: receiving the data channel from the second device according to the first control information, where the data channel is used to carry the second message;

[0041] In a case where the data on the Uu SRBO from the second device includes an RRC setup request message, the second message is an RRC setup complete message of the second device; or

[0042] In a case where the data on the Uu SRBO from the second device includes an RRC re-establishment request message, the second message is an RRC re-establishment completion message of the second device; or,

[0043] In a case where the data on the Uu SRBO from the second device includes an RRC recovery request message, the second message is an RRC recovery complete message of the second device; or,

[0044] In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, the second message is an RRC establishment completion message of the second device; or

[0045] In a case where the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message, the second message is an RRC recovery complete message of the second device; or

[0046] In a case where the data sent by the network device on the Uu SRBl of the second device includes an RRC re-establishment message, the second message is an RRC re-establishment complete message of the second device.

[0047] In the above scheme, the relay terminal device receives data on the Uu SRB0 of the remote terminal device, which can trigger the relay terminal device to release the DRX function of the relay terminal device. In the case where the data on the Uu SRB0 includes an RRC establishment request message, the first control information can be sent by the remote terminal device to the relay terminal device for scheduling the RRC establishment completion message, that is, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device sending the RRC establishment completion message. Thereby, the speed of RRC establishment can be improved. Or the relay terminal device receives data on the Uu SRB0 of the remote terminal device, which can trigger the relay terminal device to release the DRX function of the relay terminal device. In the case where the data on the Uu SRB0 includes an RRC recovery request message, the first control information can be sent by the remote terminal device to the relay terminal device for scheduling the RRC recovery completion message, that is, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device sending the RRC recovery completion message. Thereby, the speed of RRC recovery can be improved. Or the data received by the relay terminal device on the Uu SRB0 of the remote terminal device can trigger the relay terminal device to release the DRX function of the relay terminal device. In the case where the data on the Uu SRB0 includes an RRC re-establishment request message, the first control information can be sent by the remote terminal device to the relay terminal device for scheduling the RRC re-establishment completion message. That is to say, the time for the remote terminal device to send the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device in sending the RRC re-establishment completion message. Thereby, the speed of RRC re-establishment can be improved. Or the data received by the relay terminal device on the Uu SRB0 of the network device can trigger the relay terminal device to release the DRX function of the relay terminal device. In the case where the data on the Uu SRB0 includes an RRC establishment message, the first control information can be sent by the remote terminal device to the relay terminal device for scheduling the RRC establishment completion message. In other words, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device in sending the RRC establishment completion message. This can increase the speed of RRC establishment.Or the relay terminal device receives data on the Uu SRB1 of the remote terminal device, which can trigger the relay terminal device to release the DRX function of the relay terminal device. In the case where the data on the Uu SRB1 includes an RRC recovery message, the first control information can be sent by the remote terminal device to the relay terminal device for scheduling the RRC recovery completion message. In other words, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device sending the RRC recovery completion message. Or the relay terminal device receives data on the Uu SRB0 of the remote terminal device, which can trigger the relay terminal device to release the DRX function of the relay terminal device. In the case where the data on the Uu SRB1 includes an RRC re-establishment message, the first control information can be sent by the remote terminal device to the relay terminal device for scheduling the RRC re-establishment completion message. In other words, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device sending the RRC re-establishment completion message. Thus, the speed of RRC re-establishment can be improved.

[0048] Optionally, the RRC establishment complete message for the second device is an RRC establishment complete message for the second device to establish an RRC connection. Optionally, the RRC recovery complete message for the second device is an RRC recovery complete message for the second device to recover the RRC connection. Optionally, the RRC re-establishment complete message for the second device is an RRC re-establishment complete message for the second device to re-establish the RRC connection.

[0049] In some possible implementations, the first device is a relay terminal device, and the second device is a remote terminal device; the first condition includes the first device indicating to the second device that the second device is paged, or the first device sending a paging message to the second device to page the second device.

[0050] In the above scheme, if the relay terminal device indicates to the remote terminal device that the remote terminal device is paged, or sends a paging message to the remote terminal device to page the remote terminal device, it can trigger the relay terminal device to release the SL DRX function of the relay terminal device. After the relay terminal device releases the SL DRX function of the relay terminal device, the remote terminal device can initiate RRC recovery or RRC re-establishment, thereby reducing the delay for the remote terminal device to initiate RRC recovery or RRC re-establishment.

[0051] Optionally, after the remote terminal device indicates to the relay terminal device that the second device is paged, or sends a paging message to the second device to page the second device, the relay terminal device will receive the first control information from the remote terminal device for scheduling the RRC recovery request message or the RRC re-establishment request, that is, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device sending the RRC recovery request message or the RRC re-establishment request. Alternatively, the relay terminal device will receive the first control information from the remote terminal device for scheduling the RRC recovery completion message or the RRC re-establishment completion message, that is, the time when the remote terminal device sends the first control information is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device sending the RRC recovery completion message or the RRC re-establishment completion message.

[0052] In some possible implementations, the first device is a relay terminal device, and the second device is a remote terminal device; the first condition includes the first device sending first indication information to the second device, and the first indication information indicates the RLF between the first device and the network device or the RRC connection between the first device and the network device is successfully re-established.

[0053] In the above scheme, after the RLF between the relay terminal device and the network device, the relay terminal device can indicate to the remote terminal device that the RLF between the relay terminal device and the network device or the RRC connection between the relay terminal device and the network device has been successfully re-established. In this way, when the relay terminal device sends the first indication information, the relay terminal device is triggered to release the SL DRX function of the relay terminal device, thereby reducing the delay for the remote terminal device to re-establish the RRC connection.

[0054] Optionally, after the remote terminal device receives the first indication information, the method further includes: the remote terminal device can send an RRC re-establishment request message to the network device through the relay terminal device, and the time for the relay terminal device to receive the RRC re-establishment request message is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay of the remote terminal device in re-establishing the RRC connection. Optionally, the relay terminal device can receive the SCI of the scheduled RRC re-establishment request message sent by the remote terminal device, and the remote terminal device sends the RRC re-establishment request message to the relay terminal device according to the SCI, and the relay terminal device receives the RRC re-establishment request message sent by the remote terminal device according to the SCI. Among them, the SCI of the scheduled RRC re-establishment request message sent by the remote terminal device is not limited by the SL DRX function of the relay terminal device, and the relay terminal device is not limited by the SL DRX function of the relay terminal device in the process of receiving the SCI of the scheduled RRC re-establishment request message, thereby reducing the delay. Optionally, after the remote terminal device receives the first indication information, the method further includes: the remote terminal device may send an RRC re-establishment completion message to the network device through the relay terminal device, and the time for the relay terminal device to receive the RRC re-establishment completion message is not limited by the SL DRX function of the relay terminal device, thereby reducing the delay for the remote terminal device to re-establish the RRC connection. Optionally, the relay terminal device may receive the SCI of the scheduled RRC re-establishment completion message sent by the remote terminal device, the remote terminal device sends the RRC re-establishment completion message to the relay terminal device according to the SCI, and the relay terminal device receives the RRC re-establishment completion message sent by the remote terminal device according to the SCI. Among them, the SCI for the remote terminal device to send the scheduled RRC re-establishment completion message is not limited by the SL DRX function of the relay terminal device, and the relay terminal device is not limited by the SL DRX function of the relay terminal device in the process of receiving the SCI of the scheduled RRC re-establishment completion message, thereby reducing the delay.

[0055] Optionally, the remote terminal device sends an RRC re-establishment request message to the relay terminal device, which can be replaced by: the remote terminal device sends data on Uu SRB0 to the relay terminal device, and the data on Uu SRB0 includes the RRC re-establishment request message.

[0056] Optionally, the remote terminal device sends an RRC re-establishment completion message to the relay terminal device, which can be replaced by: the remote terminal device sends data on Uu SRB1 to the relay terminal device, and the data on Uu SRB1 includes the RRC re-establishment completion message.

[0057] In some possible implementations, the first device is a relay terminal device, and the second device is a network device;

[0058] The first condition includes that the first device receives data on Uu SRB0 or ​​data on Uu SRB1 from the remote terminal device, or the first device sends data on Uu SRB0 of the remote terminal device to the second device.

[0059] Optionally, the data on the Uu SRB0 from the remote terminal device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0060] Optionally, the DRX function of the first device may be a Uu DRX function of a relay terminal device.

[0061] In the above scheme, when the relay terminal device receives data on the Uu SRB0 of the remote terminal device or forwards the data on the Uu SRB0 of the remote terminal device to the network device, it can trigger the release of the DRX function of the relay terminal device. When the data on the Uu SRB0 includes an RRC establishment request message, the RRC establishment delay can be reduced. When the data on the Uu SRB0 includes an RRC recovery request message, the RRC recovery delay can be reduced. When the data on the Uu SRB0 includes an RRC re-establishment request message, the RRC re-establishment delay can be reduced.

[0062] In some possible implementations, the method further includes: receiving the data channel from the second device according to the first control information, where the data channel is used to carry the second message;

[0063] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC establishment request message, the second message is an RRC establishment message of the remote terminal device; or,

[0064] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC recovery request message, the second message is an RRC recovery message of the remote terminal device; or,

[0065] In a case where the data on the Uu SRB0 of the remote terminal device includes an RRC re-establishment request message, the second message is the RRC re-establishment message of the remote terminal device.

[0066] Optionally, the first control information may be DCI.

[0067] In the above scheme, the relay terminal device receives the data on the Uu SRB0 of the remote terminal device or forwards the data on the Uu SRB0 of the remote terminal device to the network device, which can trigger the relay terminal device to release the Uu DRX function of the relay terminal device. In the case where the data on the Uu SRB0 includes an RRC establishment request message, the first control information can be sent by the network device to the relay terminal device for scheduling the RRC establishment message, that is, the time when the network device sends the first control information is not limited by the Uu DRX function of the relay terminal device, thereby reducing the delay of the network device sending the RRC establishment message. In this way, the speed of RRC establishment can be improved. In the case where the data on the Uu SRB0 includes an RRC recovery request message, the first control information can be sent by the network device to the relay terminal device for scheduling the RRC recovery message, that is, the time when the network device sends the first control information is not limited by the Uu DRX function of the relay terminal device, thereby reducing the delay of the network device sending the RRC recovery message. In this way, the speed of RRC recovery can be improved. In the case where the data on the Uu SRB0 includes an RRC re-establishment request message, the first control information may be sent by the network device to the relayed terminal device for scheduling the RRC re-establishment message. In other words, the time at which the network device sends the first control information is not limited by the Uu DRX function of the relayed terminal device, thereby reducing the delay of the network device in sending the RRC re-establishment message. This can thereby increase the speed of RRC re-establishment.

[0068] Optionally, the RRC establishment message of the remote terminal device is an RRC establishment message used to establish an RRC connection for the remote terminal device. Optionally, the RRC recovery message of the remote terminal device is an RRC recovery message used to restore the RRC connection for the remote terminal device. Optionally, the RRC re-establishment message of the remote terminal device is an RRC re-establishment message used to re-establish the RRC connection for the remote terminal device.

[0069] In the second aspect, a method for monitoring control information is provided, which is applicable to a second device, including: if a second condition is met, releasing the discontinuous reception DRX function corresponding to the first device, the DRX function enabling the first device to monitor control information within the activation time of the discontinuous reception; sending first control information to the first device, the first control information being used to schedule a data channel.

[0070] In the above scheme, if the second condition is met, the second device can locally release the DRX function of the first device, and the second device does not need to send control information according to the DRX function of the first device. In this way, the second device is not restricted by the activation time of the DRX function of the first device when sending the first control information, and can send the first control information at any time, thereby reducing the delay.

[0071] Optionally, the method also includes: sending a data channel to the second device according to the first control information, the data channel is used to carry the second message, thereby reducing the delay in sending the second message, for example, the data channel is used to carry the second message, and the second message is used for the remote terminal device to enter the RRC connection state, thereby reducing the delay for the remote terminal device to enter the RRC connection state.

[0072] Optionally, the second device releases the discontinuous reception DRX function corresponding to the first device, which can be understood as: the second device releases the DRX function of the local or local first device.

[0073] Optionally, sending first control information to the first device includes: sending the first control information to the first device in response to releasing a discontinuous reception (DRX) function corresponding to the first device.

[0074] Optionally, the DRX function of the first device is that the first device monitors control information during an activation time of discontinuous reception, and does not monitor control information during an inactivation time of discontinuous reception.

[0075] Optionally, the first device is a remote terminal device, the second device is a relay terminal device, and the DRX function of the first device is the SL DRX function of the remote terminal device. Optionally, the first control information is SCI.

[0076] Optionally, the first device is a relay terminal device, the second device is a remote terminal device, and the DRX function of the first device is an SL DRX function of the relay terminal device. Optionally, the first control information is an SCI.

[0077] Optionally, the first device is a relay terminal device, the second device is a network device, and the DRX function of the first device is a Uu DRX function of the relay terminal device. Optionally, the first control information is DCI.

[0078] In some possible implementations, the second device is a relay terminal device, and the first device is a remote terminal device;

[0079] The second condition includes the second device receiving data on the Uu signaling radio bearer SRB0 of the first device from the first device.

[0080] Optionally, the data on the Uu SRBO of the first device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0081] In some possible implementations, the method further includes:

[0082] Sending the data channel to the first device, where the data channel is used to carry the second message;

[0083] In a case where the data on the Uu SRBO of the first device includes an RRC establishment request message, the second message is an RRC establishment message of the first device; or,

[0084] In a case where the data on the Uu SRBO of the first device includes an RRC recovery request message, the second message is an RRC recovery message of the first device; or,

[0085] In a case where the data on the Uu SRBO of the first device includes an RRC re-establishment request message, the second message is an RRC re-establishment message of the first device.

[0086] In some possible implementations, the second device is a relay terminal device, and the first device is a remote terminal device;

[0087] The second condition includes that the second device sends first indication information to the first device, where the first indication information indicates that a radio link failure RLF between the second device and the network device or a successful RRC connection re-establishment between the second device and the network device.

[0088] In some possible implementations, the second device is a remote terminal device, and the first device is a relay terminal device;

[0089] The second condition includes that the second device sends data on the Uu SRBO of the second device to the first device; or

[0090] The second condition includes a first preset time period after the second device sends data on the Uu SRBO of the second device to the first device; or

[0091] The second condition includes that the second device receives, from the first device, data sent by a network device over Uu SRBO of the second device or data sent over Uu SRBl.

[0092] Optionally, the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, and the data sent by the network device on the Uu SRBl of the second device includes an RRC recovery message or an RRC re-establishment message.

[0093] Optionally, the data on the Uu SRBO of the second device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0094] In some possible implementations, the method further includes:

[0095] Sending the data channel to the first device, where the data channel is used to carry the second message;

[0096] In a case where the data on the Uu SRBO of the second device includes an RRC establishment request message, the second message is an RRC establishment completion message of the second device; or

[0097] In a case where the data on the Uu SRBO of the second device includes an RRC recovery request message, the second message is an RRC recovery complete message of the second device; or,

[0098] In a case where the data on the Uu SRBO of the second device includes an RRC re-establishment request message, the second message is an RRC re-establishment completion message of the second device; or,

[0099] In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, the second message is an RRC establishment completion message of the second device; or

[0100] In a case where the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message, the second message is an RRC recovery complete message of the second device; or,

[0101] In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC re-establishment message, the second message is an RRC re-establishment completion message of the second device.

[0102] In some possible implementations, the second device is a remote terminal device, and the first device is a relay terminal device;

[0103] The second condition includes learning from the first device that the second device is paged, or receiving from the first device a paging message for paging the second device; or,

[0104] The second condition includes receiving first indication information from the first device, where the first indication information indicates an RLF between the first device and the network device or a successful RRC connection re-establishment between the first device and the network device.

[0105] In some possible implementations, the first device is a relay terminal device, and the second device is a network device;

[0106] The second condition includes that the second device receives data on the Uu SRBO of the remote terminal device from the first device.

[0107] Optionally, the data on the Uu SRB0 of the remote terminal device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0108] In some possible implementations, the method further includes:

[0109] Sending the data channel to the first device, where the data channel is used to carry the second message;

[0110] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC establishment request message, the second message is an RRC establishment message of the remote terminal device; or,

[0111] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC recovery request message, the second message is an RRC recovery message of the remote terminal device; or,

[0112] In a case where the data on the Uu SRB0 of the remote terminal device includes an RRC re-establishment request message, the second message is the RRC re-establishment message of the remote terminal device.

[0113] Specifically, the detailed description of the second aspect refers to the description of the first aspect, and in order to avoid redundancy, it is not described in detail.

[0114] In a third aspect, a method for monitoring control information is provided, which is applicable to a first device and includes: based on a third condition, the first device starts a first timer; and monitors first control information during the operation of the first timer, where the first control information is used to schedule a data channel.

[0115] In the above solution, the first device can start the first timer based on the third condition. In this way, when monitoring the first control information, the first device does not need to pay attention to the DRX function of the first device. The first device only needs to monitor the first control information during the running period of the first timer, thereby reducing latency.

[0116] Optionally, if the data channel scheduled by the first control information is used to carry the second message, the delay in transmitting the second message can be reduced. Optionally, the second message is used for the remote terminal device to enter the RRC connection state, thus reducing the delay for the remote terminal device to enter the RRC connection state.

[0117] Optionally, the first device is a remote terminal device, the second device is a relay terminal device, and the DRX function of the first device is the SL DRX function of the remote terminal device. Optionally, the first control information is SCI.

[0118] Optionally, the first device is a relay terminal device, the second device is a remote terminal device, and the DRX function of the first device is an SL DRX function of the relay terminal device. Optionally, the first control information is an SCI.

[0119] Optionally, the first device is a relay terminal device, the second device is a network device, and the DRX function of the first device is a Uu DRX function of the relay terminal device. Optionally, the first control information is DCI.

[0120] Optionally, the third condition may implicitly trigger the first device to start the first timer.

[0121] In some possible implementations, the first device is configured to monitor control information from the second device according to a discontinuous reception (DRX) function of the first device, where the DRX function causes the first device to monitor the control information during an activation time of the discontinuous reception, where the activation time includes the running time of the first timer. In other words, the activation time of the DRX function of the first device may be increased by the running time of the first timer. This allows the first device to monitor the first control information for a longer period of time, thereby reducing transmission latency.

[0122] Optionally, the first timer may be specified by a protocol or configured by a network device. If the first device is a relay terminal device and the second device is a remote terminal device, the first timer may be configured by the remote terminal device.

[0123] In some possible implementations, the first device starts a first timer based on the third condition, including: if the third condition is met, the first device starts a second timer, and after the second timer times out, starts the first timer.

[0124] In the above solution, if the third condition is met, the first device is triggered to start the second timer, and the first timer is started after the second timer times out, thereby avoiding power consumption caused by starting the first timer in advance.

[0125] Optionally, the second timer may be specified by a protocol or configured by a network device.

[0126] Optionally, if the first device is a remote terminal device and the second device is a relay terminal device, the duration of the second timer is related to the RRC state of the relay terminal device. For example, when the relay terminal device is in the RRC_IDLE state or the RRC_INACTIVE state, the duration of the second timer is longer, and when the relay terminal device is in the RRC_CONNECTED state, the duration of the second timer is shorter. That is to say, since the relay terminal device needs to spend a longer time to enter the RRC_CONNECTED state from the RRC_IDLE state or the RRC_INACTIVE state, the relay terminal device and the remote terminal device can start the first timer later. If the relay terminal device and the remote terminal device start the first timer in advance, but the RRC connection between the relay terminal device and the network device is not established, it is necessary to wait for the time for the relay terminal device and the network device to establish the RRC connection, resulting in relatively large power consumption of the relay terminal device and the remote terminal device.

[0127] In some possible implementations, the method further includes: receiving the data channel from the second device according to the first control information, where the data channel is used to carry the second message; and after receiving the data channel, triggering the first timer to stop.

[0128] In the above solution, if the first device is able to receive the data channel, the first timer may be triggered to stop.

[0129] In some possible implementations, the first device is a remote terminal device, and the second device is a relay terminal device; the third condition includes the first device sending a first message to the network device through the second device; the first message is an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0130] In some possible implementations, the method further includes: receiving the data channel from the second device according to the first control information, where the data channel is used to carry a second message that the first device enters an RRC connected state;

[0131] In the case where the first message is an RRC establishment request message, the second message is an RRC establishment message of the first device; or,

[0132] In the case where the first message is an RRC recovery request message, the second message is an RRC recovery message of the first device; or,

[0133] In the case that the first message is an RRC re-establishment request message, the second message is an RRC re-establishment message of the first device.

[0134] In some possible implementations, the first device is a remote terminal device, and the second device is a relay terminal device;

[0135] The third condition includes that the first device receives first indication information sent by the second device, and the first indication information indicates that the radio link failure RLF between the second device and the network device or the RRC connection re-establishment between the second device and the network device is successful.

[0136] In some possible implementations, the first device is a relay terminal device, and the second device is a remote terminal device;

[0137] The third condition includes that the first device receives data on the Uu signaling radio bearer SRB0 from the second device; or

[0138] The third condition includes that the first device sends data on UuSRB0 from the second device to the network device; or

[0139] The third condition includes a first preset time period after the first device receives data on the Uu SRBO from the second device; or

[0140] The third condition includes that the first device receives data sent by the network device on Uu SRBO or UuSRB1 of the second device; or

[0141] The third condition includes forwarding to the second device the data sent by the network device over Uu SRBO or Uu SRBl of the second device.

[0142] Optionally, the data on the Uu SRBO from the second device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0143] Optionally, the data sent by the network device on the Uu SRB0 of the second device includes an RRC establishment message; optionally, the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message or an RRC re-establishment message.

[0144] In some possible implementations, the method further includes:

[0145] receiving the data channel from the second device according to the first control information, where the data channel is used to carry a second message;

[0146] In a case where the data on the Uu SRBO from the second device includes an RRC setup request message, the second message is an RRC setup complete message of the second device; or

[0147] In a case where the data on the Uu SRBO from the second device includes an RRC recovery request message, the second message is an RRC recovery complete message of the second device; or,

[0148] In a case where the data on the Uu SRBO from the second device includes an RRC re-establishment request message, the second message is an RRC re-establishment completion message of the second device; or,

[0149] In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, the second message is an RRC establishment completion message of the second device; or

[0150] In a case where the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message, the second message is an RRC recovery complete message of the second device; or

[0151] In a case where the data sent by the network device on the Uu SRBl of the second device includes an RRC re-establishment message, the second message is an RRC re-establishment complete message of the second device.

[0152] In some possible implementations, the first device is a relay terminal device, and the second device is a remote terminal device;

[0153] The third condition includes the first device indicating to the second device that the second device is paged, or the first device sending a paging message to the second device to page the second device; or,

[0154] The third condition includes that the first device sends first indication information to the second device, where the first indication information indicates that an RLF between the first device and the network device or a successful RRC connection re-establishment between the first device and the network device is successful.

[0155] In some possible implementations, the first device is a relay terminal device, and the second device is a network device;

[0156] The third condition includes that the first device receives data on the Uu SRBO of the remote terminal device, or the first device sends data on the Uu SRBO of the remote terminal device to the second device.

[0157] Optionally, the data on the Uu SRB0 of the remote terminal device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0158] In some possible implementations, the method further includes: receiving the data channel from the second device according to the first control information, where the data channel is used to carry the second message;

[0159] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC establishment request message, the second message is an RRC establishment message of the remote terminal device; or,

[0160] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC recovery request message, the second message is an RRC recovery message of the remote terminal device; or,

[0161] In a case where the data on the Uu SRB0 of the remote terminal device includes an RRC re-establishment request message, the second message is the RRC re-establishment message of the remote terminal device.

[0162] Specifically, the description of the third aspect can refer to the description of the first aspect, and in order to avoid redundancy, the embodiments of the present application are not described in detail.

[0163] In a fourth aspect, a method for monitoring control information is provided, comprising: based on a fourth condition, the second device starting a third timer;

[0164] During the running of the third timer, first control information is sent to the first device, where the first control information is used to schedule a data channel.

[0165] In the above solution, the second device can start the third timer based on the fourth condition. In this way, when the second device sends the first control information to the first device, it does not need to pay attention to the DRX function of the first device. The second device only needs to send the first control information during the running period of the third timer, thereby reducing latency.

[0166] Optionally, if the data channel scheduled by the first control information is used to carry the second message, the delay in transmitting the second message can be reduced. Optionally, the second message is used for the remote terminal device to enter the RRC connection state, which can reduce the delay for the remote terminal device to enter the RRC connection state.

[0167] In some possible implementations, the second device is used to send control information to the first device based on the discontinuous reception DRX function of the first device, and the DRX function is for the first device to monitor the control information within the activation time of the discontinuous reception, and the activation time includes the running time of the third timer.

[0168] In some possible implementations, the second device starting a third timer based on the fourth condition includes:

[0169] If the fourth condition is met, the second device starts a fourth timer, and after the fourth timer times out, starts the third timer.

[0170] In some possible implementations, the method further includes:

[0171] sending a data channel to the first device according to the first control information, where the data channel is used to carry a second message;

[0172] After sending the data channel, the third timer is triggered to stop.

[0173] In some possible implementations, the second device is a relay terminal device, and the first device is a remote terminal device;

[0174] The fourth condition includes the second device receiving data on the Uu signaling radio bearer SRB0 of the first device from the first device.

[0175] Optionally, the data on the Uu signaling radio bearer SRB0 of the first device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0176] In some possible implementations, the method further includes: sending a data channel to the first device, where the data channel is used to carry the second message;

[0177] In a case where the data on the Uu SRBO of the first device includes an RRC establishment request message, the second message is an RRC establishment message of the first device; or,

[0178] In a case where the data on the Uu SRBO of the first device includes an RRC recovery request message, the second message is an RRC recovery message of the first device; or,

[0179] In a case where the data on the Uu SRBO of the first device includes an RRC re-establishment request message, the second message is an RRC re-establishment message of the first device.

[0180] In some possible implementations, the second device is a relay terminal device, and the first device is a remote terminal device;

[0181] The fourth condition includes that the second device sends first indication information to the first device, and the first indication information indicates that the radio link between the second device and the network device fails RLF or the RRC connection between the second device and the network device is successfully re-established.

[0182] In some possible implementations, the second device is a remote terminal device, and the first device is a relay terminal device;

[0183] The fourth condition includes that the second device sends data on the Uu SRBO of the second device to the first device; or

[0184] The fourth condition includes that the second device sends the data of the second device on Uu SRBO to the first device within a first preset time period; or

[0185] The fourth condition includes that the second device receives from the first device data sent by the network device over Uu SRBO of the second device or data sent over Uu SRBl.

[0186] Optionally, the data on the Uu SRBO of the second device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0187] Optionally, the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message. Optionally, the data sent by the network device on the Uu SRBl of the second device includes an RRC recovery message or an RRC re-establishment message.

[0188] In some possible implementations, the method further includes:

[0189] Sending the data channel to the first device, where the data channel is used to carry the second message;

[0190] In a case where the data on the Uu SRBO of the second device includes an RRC establishment request message, the second message is an RRC establishment completion message of the second device; or

[0191] In a case where the data on the Uu SRBO of the second device includes an RRC recovery request message, the second message is an RRC recovery complete message of the second device; or,

[0192] In a case where the data on the Uu SRBO of the second device includes an RRC re-establishment request message, the second message is an RRC re-establishment completion message of the second device; or,

[0193] In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, the second message is an RRC establishment completion message of the second device; or

[0194] In a case where the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message, the second message is an RRC recovery complete message of the second device; or,

[0195] In a case where the data sent by the network device on the Uu SRBl of the second device includes an RRC re-establishment message, the second message is an RRC re-establishment complete message of the second device.

[0196] In some possible implementations, the second device is a remote terminal device, and the first device is a relay terminal device;

[0197] The fourth condition includes learning from the first device that the second device is paged, or receiving from the first device a paging message for paging the second device; or,

[0198] The fourth condition includes receiving first indication information from the first device, where the first indication information indicates an RLF between the first device and the network device or a successful RRC connection re-establishment between the first device and the network device.

[0199] In some possible implementations, the first device is a relay terminal device, and the second device is a network device;

[0200] The fourth condition includes that the second device receives data on the Uu SRBO of the remote terminal device from the first device.

[0201] Optionally, the data on the Uu SRB0 of the remote terminal device includes an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

[0202] In some possible implementations, the method further includes: sending a data channel to the first device, where the data channel is used to carry the second message;

[0203] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC establishment request message, the second message is an RRC establishment message of the remote terminal device; or,

[0204] In the case where the data on the Uu SRBO of the remote terminal device includes an RRC recovery request message, the second message is an RRC recovery message of the remote terminal device; or,

[0205] In the case that the data on the Uu SRB0 of the remote terminal device includes an RRC re-establishment request message, the second message is the RRC re-establishment message of the remote terminal device.

[0206] Specifically, the description of the fourth aspect can refer to the description of the first and third aspects. In order to avoid redundancy, the embodiments of the present application are not described in detail.

[0207] In a fifth aspect, a communication device for monitoring control information is provided, the communication device being configured to perform the method of any possible implementation of the first aspect. Specifically, the communication device may include a processing unit and a transceiver unit. The transceiver unit may communicate with an external device, and the processing unit may perform data processing. The transceiver unit may also be referred to as a communication interface or a communication unit.

[0208] The communication device can be used to execute the actions performed by the first device in any possible implementation of the first aspect. In this case, the communication device can be called the first device, the transceiver unit is used to execute the transceiver-related operations on the first device side in any possible implementation of the first aspect, and the processing unit is used to execute the processing-related operations on the first device side in any possible implementation of the first aspect.

[0209] In a sixth aspect, a communication device for monitoring control information is provided, the communication device being configured to perform the method of any possible implementation of the second aspect. Specifically, the communication device may include a processing unit and a transceiver unit. The transceiver unit may communicate with an external device, and the processing unit may perform data processing. The transceiver unit may also be referred to as a communication interface or a communication unit.

[0210] The communication device can be used to execute the actions performed by the second device in any possible implementation of the second aspect. In this case, the communication device can be called the second device, the transceiver unit is used to execute the transceiver-related operations on the second device side in any possible implementation of the second aspect, and the processing unit is used to execute the processing-related operations on the second device side in any possible implementation of the second aspect.

[0211] In a seventh aspect, a communication device for monitoring control information is provided, the communication device being configured to perform the method of any possible implementation of the third aspect. Specifically, the communication device may include a processing unit and a transceiver unit. The transceiver unit may communicate with an external device, and the processing unit may perform data processing. The transceiver unit may also be referred to as a communication interface or a communication unit.

[0212] The communication device can be used to execute the actions performed by the first device in any possible implementation of the third aspect. In this case, the communication device can be called the first device, the transceiver unit is used to execute the transceiver-related operations on the first device side in any possible implementation of the third aspect, and the processing unit is used to execute the processing-related operations on the first device side in any possible implementation of the third aspect.

[0213] In an eighth aspect, a communication device for monitoring control information is provided, the communication device being configured to perform the method of any possible implementation of the fourth aspect. Specifically, the communication device may include a processing unit and a transceiver unit. The transceiver unit may communicate with an external device, and the processing unit may be configured to perform data processing. The transceiver unit may also be referred to as a communication interface or a communication unit.

[0214] The communication device can be used to execute the actions performed by the second device in any possible implementation of the fourth aspect. In this case, the communication device can be called the second device, the transceiver unit is used to execute the transceiver-related operations on the second device side in any possible implementation of the fourth aspect, and the processing unit is used to execute the processing-related operations on the second device side in any possible implementation of the fourth aspect.

[0215] In a ninth aspect, a communication device is provided, which includes a processor and a memory, the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions stored in the memory, so that the method in the above-mentioned first aspect or any possible implementation of the first aspect is executed.

[0216] For example, the processor is used to execute a computer program or instruction stored in the memory, so that the communication device executes the method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0217] Optionally, the communication device includes one or more processors.

[0218] Optionally, the communication device may further include a memory coupled to the processor.

[0219] Optionally, the communication device may include one or more memories.

[0220] Optionally, the memory may be integrated with the processor or provided separately.

[0221] Optionally, the communication device may further include a transceiver.

[0222] In a tenth aspect, a communication device is provided, which includes a processor and a memory, the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions stored in the memory, so that the method in the above-mentioned second aspect or any possible implementation of the second aspect is executed.

[0223] For example, the processor is used to execute a computer program or instruction stored in the memory, so that the communication device executes the method in the above-mentioned second aspect or any possible implementation manner of the second aspect.

[0224] Optionally, the communication device includes one or more processors.

[0225] Optionally, the communication device may further include a memory coupled to the processor.

[0226] Optionally, the communication device may include one or more memories.

[0227] Optionally, the memory may be integrated with the processor or provided separately.

[0228] Optionally, the communication device may further include a transceiver.

[0229] In the eleventh aspect, a communication device is provided, which includes a processor and a memory, the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions stored in the memory, so that the method in the above-mentioned third aspect or any possible implementation of the third aspect is executed.

[0230] For example, the processor is used to execute a computer program or instruction stored in the memory, so that the communication device executes the method in the above-mentioned third aspect or any possible implementation manner of the third aspect.

[0231] Optionally, the communication device includes one or more processors.

[0232] Optionally, the communication device may further include a memory coupled to the processor.

[0233] Optionally, the communication device may include one or more memories.

[0234] Optionally, the memory may be integrated with the processor or provided separately.

[0235] Optionally, the communication device may further include a transceiver.

[0236] In the twelfth aspect, a communication device is provided, which includes a processor and a memory, the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions stored in the memory, so that the method in the above-mentioned fourth aspect or any possible implementation of the fourth aspect is executed.

[0237] For example, the processor is used to execute a computer program or instruction stored in the memory, so that the communication device executes the method in the above-mentioned fourth aspect or any possible implementation of the fourth aspect.

[0238] Optionally, the communication device includes one or more processors.

[0239] Optionally, the communication device may further include a memory coupled to the processor.

[0240] Optionally, the communication device may include one or more memories.

[0241] Optionally, the memory may be integrated with the processor or provided separately.

[0242] Optionally, the communication device may further include a transceiver.

[0243] In a thirteenth aspect, a communication system is provided, which includes the communication device in the fifth aspect or any possible implementation of the fifth aspect and the communication device in the sixth aspect or any possible implementation of the sixth aspect; or the communication system includes: the communication device in the seventh aspect or any possible implementation of the seventh aspect and the communication device in the eighth aspect or any possible implementation of the eighth aspect; or the communication system includes the communication device in the ninth aspect or any possible implementation of the ninth aspect and the communication device in the tenth aspect or any possible implementation of the tenth aspect. Or the communication system includes the communication device in the eleventh aspect or any possible implementation of the eleventh aspect and the communication device in the twelfth aspect or any possible implementation of the twelfth aspect.

[0244] In a fourteenth aspect, a computer-readable storage medium is provided, on which a computer program (also referred to as instructions or codes) for implementing the methods in various aspects or any possible implementation of various aspects is stored.

[0245] For example, when the computer program is executed by a computer, the computer can perform the method in any aspect or any possible implementation of the aspect. The computer can be a communication device.

[0246] In a fifteenth aspect, the present application provides a chip including a processor, wherein the processor is configured to read and execute a computer program stored in a memory to perform the methods in various aspects and any possible implementation thereof.

[0247] Optionally, the chip further includes a memory, and the memory is connected to the processor via a circuit or wire.

[0248] Further optionally, the chip also includes a communication interface.

[0249] In the sixteenth aspect, the present application provides a computer program product, which includes a computer program (also referred to as instructions or codes), which, when executed by a computer, enables the computer to implement methods in various aspects or any possible implementation of various aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0250] Figure 1 It is a schematic diagram of a communication system provided in an embodiment of the present application.

[0251] Figure 2 It is a schematic diagram of another communication system provided in an embodiment of the present application.

[0252] Figure 3 This is a schematic diagram of the activation time of the DRX function provided in an embodiment of the present application.

[0253] Figure 4 This is a schematic diagram of establishing an RRC connection provided in an embodiment of the present application.

[0254] Figure 5 This is a schematic diagram of the delay in the process of establishing an RRC connection provided in an embodiment of the present application.

[0255] Figure 6 This is a schematic diagram of restoring an RRC connection provided in an embodiment of the present application.

[0256] Figure 7 This is a schematic diagram of the delay in the process of restoring the RRC connection provided in an embodiment of the present application.

[0257] Figure 8 This is a schematic diagram of re-establishing an RRC connection provided in an embodiment of the present application.

[0258] Figure 9 This is a schematic diagram of the delay in the process of re-establishing the RRC connection provided in an embodiment of the present application.

[0259] Figure 10 It is a schematic diagram of a method for monitoring control information provided in an embodiment of the present application.

[0260] Figure 11This is a schematic diagram of releasing the SL DRX function of the first terminal device during the process of establishing an RRC connection provided by an embodiment of the present application.

[0261] Figure 12 This is a schematic diagram of releasing the SL DRX function of the first terminal device during the RRC connection restoration process provided in an embodiment of the present application.

[0262] Figure 13 This is a schematic diagram of releasing the SL DRX function of the first terminal device during the process of re-establishing the RRC connection provided in an embodiment of the present application.

[0263] Figure 14 This is a schematic diagram of releasing the SL DRX function of the first terminal device during the process of re-establishing the RRC connection provided in an embodiment of the present application.

[0264] Figure 15 This is a schematic diagram of releasing the SLDRX function of the first terminal device during the paging of the second terminal device provided in an embodiment of the present application.

[0265] Figure 16 This is a schematic diagram of releasing the SL DRX function of the second terminal device during the process of establishing an RRC connection provided by an embodiment of the present application.

[0266] Figure 17 This is a schematic diagram of releasing the SL DRX function of the second terminal device during the RRC connection restoration process provided in an embodiment of the present application.

[0267] Figure 18 This is a schematic diagram of releasing the SL DRX function of the second terminal device during the process of re-establishing the RRC connection provided by an embodiment of the present application.

[0268] Figure 19 This is a schematic diagram of releasing the SL DRX function of the second terminal device during the process of re-establishing the RRC connection provided in an embodiment of the present application.

[0269] Figure 20 This is a schematic diagram of releasing the SLDRX function of the second terminal device during the paging process of the second terminal device provided in an embodiment of the present application.

[0270] Figure 21 This is a schematic diagram of releasing the Uu DRX function of the first terminal device during the process of establishing an RRC connection provided by an embodiment of the present application.

[0271] Figure 22 This is a schematic diagram of releasing the Uu DRX function of the first terminal device during the RRC connection restoration process provided in an embodiment of the present application.

[0272] Figure 23This is a schematic diagram of releasing the Uu DRX function of the first terminal device during the process of re-establishing the RRC connection provided in an embodiment of the present application.

[0273] Figure 24 This is a schematic diagram of another method for monitoring control information provided in an embodiment of the present application.

[0274] Figure 25 This is a schematic block diagram of an apparatus for monitoring control information provided in an embodiment of the present application.

[0275] Figure 26 This is a schematic block diagram of another device for monitoring control information provided by an embodiment of the present application. DETAILED DESCRIPTION

[0276] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0277] It should be understood that the methods, situations, categories and divisions of the embodiments in the present application are only for the convenience of description and should not constitute special limitations. The features of various methods, categories, situations and embodiments can be combined without contradiction.

[0278] It should also be understood that the terms "first," "second," and "third" in the embodiments of this application are for distinction only and should not constitute any limitation on this application. It should also be understood that in the various embodiments of this application, the order of the sequence numbers of the processes does not imply a specific order of execution. The order of execution of the processes should be determined by their functions and inherent logic, and should not constitute any limitation on the implementation of the embodiments of this application.

[0279] Figure 1 and Figure 2 is a schematic diagram of an inter-device communication system. The wireless communication system may include one or more network devices, such as Figure 1 The wireless communication system may include a first terminal device 120 and a second terminal device 130. Figure 1 and Figure 2 In the example, the network device 110 can communicate with the first terminal device 120. The link where the first terminal device 120 sends data to the network device 110 is called an uplink, and the link where the first terminal device 120 receives data sent by the network device 110 is called a downlink. Figure 1 and Figure 2 As shown, the wireless communication system may also include multiple terminal devices, including Figure 1 and Figure 2In the second terminal device 130, the first terminal device 120 and the second terminal device 130 can communicate directly. Alternatively, the first terminal device 120 can be a relay device for the second terminal device 130. In this way, the second terminal device 130 can communicate with the network device 110 through the first terminal device 120. Specifically, the second terminal device 130 can send data to the first terminal device 120 via the sidelink with the first terminal device 120, and the first terminal device 120 can send data from the second terminal device 130 to the network device 110 via the uplink between the first terminal device 120 and the network device 110. When the network device 110 has data to send to the second terminal device 130, the network device 110 can first send the data to the first terminal device 120, and the first terminal device 120 forwards the data to the second terminal device 130. The link for transmitting data between the first terminal device 120 and the second terminal device 130 is called a sidelink (SL). For example, the second terminal device 130 can send data to the first terminal device 120 via a sidelink, and the first terminal device 120 can send data to the second terminal device 130 via a sidelink. Sidelinks are generally used in scenarios where direct communication between devices is possible, such as vehicle-to-everything (V2X) or device-to-device (D2D). V2X communication can be considered a special case of D2D communication.

[0280] If the second terminal device 130 is far away from the network device 110 (for example, Figure 2 As shown, the second terminal device 130 is not within the coverage of the network device 110), or as Figure 1As shown, the second terminal device 130 is at the coverage edge of the network device 110, or the link quality between the second terminal device 130 and the network device 110 is poor, or the second terminal device 130 cannot be directly served by the network device 110, or the second terminal device 130 is not provided with a Uu port, or the second terminal device 130 has low power, or the second terminal device 130 is in energy-saving mode, or the second terminal device 130 wants to reduce power consumption. The second terminal device 130 can communicate with the network device 110 through the first terminal device 120. For example, the first terminal device 120 is a relay terminal device and the second terminal device 130 is a remote terminal device. The first terminal device 120 acts as a relay device for the second terminal device 130, which can improve the coverage capability of the network device 110, improve the efficiency of the second terminal device 130, and avoid the situation where the second terminal device 130 cannot access the network. In some embodiments, the first terminal device 120 can be a terminal device that provides network access for the second terminal device 130. In some embodiments, the first terminal device 120 provides relay services for the second terminal device 130. The first terminal device 120 provides relay services for the second terminal device 130, which can be understood as the information or data sent by the second terminal device 130 to the network device 110 is forwarded to the network device 110 through the first terminal device 110, and the information or data sent by the network device 110 to the second terminal device 130 is also forwarded to the second terminal device 130 through the first terminal device 120.

[0281] Figure 1 and Figure 2 The interface between the first terminal device 120 and the second terminal device 130 is called a PC5 interface. The PC5 interface is an interface between terminal devices and is also called a PC5 reference point. Figure 1 and Figure 2 The interface between the first terminal device 120 and the network device 110 is called the Uu interface. The Uu interface is the interface between the terminal device and the network device. The Uu interface is also called the Uu reference point. The network device can be Figure 1 and Figure 2The network device 110 in the embodiment may be a radio access network, which may be a next generation-radio access network (NG-RAN) or an evolved UMTS terrestrial radio access network (E-UTRAN), where UMTS is the abbreviation of universal mobile telecommunications system.

[0282] In some embodiments, Figure 1 and Figure 2 The first terminal device 120 may be a ProSe UE-to-Network Relay or a 5G ProSe UE-to-Network Relay.

[0283] In some embodiments, Figure 1 and Figure 2 The second terminal device 130 may be a UE connected to a network or a public data network (PDN) or a data network (DN) through ProSe UE-to-Network Relay / 5G ProSe UE-to-UE Relay.

[0284] In some embodiments, the network device 110, the first terminal device 120, and the second terminal device 130 respectively include a service data adaptation protocol (SDAP) layer, an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a media access control (MAC) layer, and a physical (PHY) layer. The first terminal device 120 acts as a relay device for the second terminal device 130. When relaying data of the second terminal device 130, the data is transmitted through the RLC layer, MAC layer, and PHY layer of the first terminal device 120, without passing through the PDCP layer, SDAP layer, and RRC layer of the first terminal device 120. When an RRC connection is established between the second terminal device 130 and the network device 110, the RRC signaling between the second terminal device 130 and the network device 110 passes through the PDCP layer and RRC layer of the second terminal device 130 and the network device 110 on the Uu interface between the second terminal device 130 and the network device 110, passes through the RLC layer, MAC layer and PHY layer of the second terminal device 130 and the first terminal device 120 on the PC5 interface between the second terminal device 130 and the first terminal device 120, and passes through the RLC layer, MAC layer and PHY layer of the first terminal device 120 and the network device 110 on the Uu interface between the first terminal device 120 and the network device 110.

[0285] The first terminal device 120 and the second terminal device 130 may be fixed in position or movable. Figure 1 and Figure 2 This is just a schematic diagram. The communication system may also include other network devices, such as wireless backhaul equipment. Figure 1 The embodiments of the present application do not limit the types and quantities of network devices and terminal devices included in the mobile communication system.

[0286] In a mobile communication system, the network device 110 may be: a base station, an evolved node B (eNB), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc. It may also be a gNB in ​​an NR system, or it may be a component or part of a base station, such as a central unit (CU), a distributed unit (DU) or a baseband unit (BBU), etc.

[0287] The first terminal device 120 or the second terminal device 130 in the mobile communication system may also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, or a wireless terminal used in scenarios such as virtual reality (VR), augmented reality (AR), industrial control (industrial control), self-driving, remote medical, smart grid, transportation safety, smart city, and smart home. In this application, the aforementioned terminal devices and chips applicable to the aforementioned terminal devices are collectively referred to as terminal devices. It should be understood that the embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal devices.

[0288] It should be understood that Figure 1 and Figure 2 The first terminal device 120, the second terminal device 130 and the network device 110 are schematically shown for ease of understanding only, but this should not constitute any limitation to the present application. The wireless communication system can also have a larger number of network devices and can also include a larger or smaller number of terminal devices, and the present application does not limit this.

[0289] For the convenience of description, the number of the first terminal device is omitted below. For example, the first terminal device below is represented by Figure 1 or Figure 2 The second terminal device below represents the “first terminal device 120” Figure 1 or Figure 2 "Second terminal device 130".

[0290] In order to reduce the power consumption of the terminal device, the terminal device can be made to receive information or data for a period of time, and be in a dormant state for another period of time without receiving information or data. In this way, the power consumption of the terminal device can be reduced. For example, the power consumption of the terminal device can be reduced by the discontinuous reception (DRX) function of the terminal device. For example, the DRX function can be a DRX function between terminal devices, and the DRX function between terminal devices is called an SL DRX function; for another example, the DRX function can be a DRX function between a terminal device and a network device, and the DRX function between a terminal device and a network device can be called a Uu DRX function. The following is combined with Figure 1 and Figure 2 The first terminal device or the second terminal device describes the SL DRX function and the Uu DRX function.

[0291] SL DRX function of the first terminal device

[0292] The network device or the second terminal device can configure the SL DRX function of the first terminal device. If the SL DRX function of the first terminal device is configured by the network device, the network device can configure the SL DRX function of the first terminal device to the first terminal device and the second terminal device respectively, so that the second terminal device sends sidelink control information (SCI) within the activation time corresponding to the SL DRX function of the first terminal device, and the first terminal device can monitor the SCI within the activation time corresponding to the SL DRX function of the first terminal device, and the first terminal device does not monitor the SCI during the inactivation time of the SL DRX function of the first terminal device. For example, Figure 3 As shown, Figure 3 The activation time shown may be the activation time corresponding to the SL DRX function of the first terminal device, and the time other than the activation time is the non-activation time corresponding to the SL DRX function of the first terminal device.

[0293] Optionally, the network device or the second terminal device can configure the parameters corresponding to the SL DRX function of the first terminal device. The parameters corresponding to the SL DRX function of the first terminal device include at least one of sl-drx-onDurationTimer, sl-drx-InactivityTimer, sl-drx-HARQ-RTT-Timer or sl-drx-RetransmissionTimer. Among them, sl-drx-OnDurationTimer is used to indicate a period of time after the start of the SL DRX cycle, that is, the first terminal device starts the sl-drx-OnDurationTimer after the start of the SL DRX cycle. sl-drx-InactivityTimer is used to indicate a period of time after an SCI indicating a new SL transmission, that is, the first terminal device starts the sl-drx-InactivityTimer after receiving the SCI indicating a new SL transmission. sl-drx-RetransmissionTimer is used to indicate the maximum time to receive an SCI indicating SL retransmission, that is, if the SL data is not received successfully, the first terminal device starts the sl-drx-RetransmissionTimer and listens to the SCI during the operation of the sl-drx-RetransmissionTimer, so that the retransmitted SL data can be received. sl-drx-HARQ-RTT-Timer is used to indicate the minimum time before the expected receipt of an SCI indicating SL retransmission, that is, after the first terminal device receives an SL transmission, it starts the sl-drx-HARQ-RTT-Timer, and during the operation of the sl-drx-HARQ-RTT-Timer, the second terminal device as the transmitter will not send a retransmission. After the sl-drx-HARQ-RTT-Timer times out, the first terminal device starts the sl-drx-RetransmissionTimer.

[0294] Optionally, the activation time corresponding to the SL DRX function of the first terminal device may be the running time of at least one of sl-drx-OnDurationTimer, sl-drx-InactivityTimer or sl-drx-RetransmissionTimer.

[0295] SL DRX function of the second terminal device

[0296] The network device or the first terminal device can configure the SL DRX function of the second terminal device. The first terminal device can send SCI during the activation time corresponding to the SL DRX function of the second terminal device, and the second terminal device can monitor SCI during the activation time corresponding to the SL DRX function of the second terminal device. The second terminal device does not monitor SCI during the inactivation time of the SL DRX function of the second terminal device. For example, Figure 3 As shown, Figure 3 The activation time shown may be the activation time corresponding to the SL DRX function of the second terminal device, and the time other than the activation time may be the inactivation time corresponding to the SL DRX function of the second terminal device.

[0297] Optionally, the first terminal device may configure parameters corresponding to the SL DRX function of the second terminal device, and the parameters corresponding to the SL DRX function of the second terminal device include: at least one of sl-drx-onDurationTimer, sl-drx-InactivityTimer, sl-drx-HARQ-RTT-Timer or sl-drx-RetransmissionTimer. Among them, sl-drx-OnDurationTimer is used to indicate a period of time at the start of the SL DRX cycle, that is, the second terminal device starts the sl-drx-OnDurationTimer after the start of the SL DRX cycle. sl-drx-InactivityTimer is used to indicate a period of time after an SCI indicating a new SL transmission, that is, the second terminal device starts the sl-drx-InactivityTimer after receiving the SCI indicating a new SL transmission. sl-drx-RetransmissionTimer is used to indicate the maximum time to receive an SCI indicating SL retransmission, that is, if the SL data is not received successfully, the second terminal device starts the sl-drx-RetransmissionTimer and listens to the SCI during the operation of the sl-drx-RetransmissionTimer, so that the retransmitted SL data can be received. sl-drx-HARQ-RTT-Timer is used to indicate the minimum time before the expected receipt of an SCI indicating SL retransmission, that is, after the second terminal device receives an SL transmission, it starts the sl-drx-HARQ-RTT-Timer. During the operation of the sl-drx-HARQ-RTT-Timer, the first terminal device as the transmitter will not send a retransmission. After the sl-drx-HARQ-RTT-Timer times out, the second terminal device starts the sl-drx-RetransmissionTimer.

[0298] Optionally, the activation time corresponding to the SL DRX function of the second terminal device may be the running time of at least one of sl-drx-OnDurationTimer, sl-drx-InactivityTimer or sl-drx-RetransmissionTimer.

[0299] In the above description of the SL DRX of the first terminal device and the SL DRX of the second terminal device, SCI is mentioned. Optionally, in the embodiment of the present application, SCI includes two stages of SCI. The two stages of SCI are the first stage SCI (1 st stage SCI) and second stage SCI (2 nd stage SCI), physical sidelink control channel (PSCCH) carries 1 st stage SCI, physical sidelink shared channel (PSSCH) carries 2 nd stage SCI.

[0300] Uu DRX function of the first terminal device

[0301] When the first terminal device is in the RRC connection state, the network device can configure the Uu DRX function of the first terminal device. The network device can send DCI or downlink physical control channel (physical downlink control channel, PDCCH) during the activation time corresponding to the Uu DRX function of the first terminal device, and the first terminal device monitors DCI or PDCCH during the activation time corresponding to the Uu DRX function of the first terminal device. The first terminal device does not monitor DCI or PDCCH during the inactive time corresponding to the Uu DRX function of the first terminal device. For example, Figure 3 As shown, Figure 3 The activation time shown may be the activation time corresponding to the Uu DRX function of the first terminal device, and the time other than the activation time may be the inactivation time corresponding to the Uu DRX function of the first terminal device.

[0302] Optionally, the network device can configure parameters corresponding to the Uu DRX function of the first terminal device, and the parameters corresponding to the Uu DRX function of the first terminal device include: at least one of drx-onDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, drx-RetransmissionTimerDL, drx-HARQ-RTT-TimerUL, drx-RetransmissionTimerUL, drx-HARQ-RTT-TimerSL or drx-RetransmissionTimerSL. Among them, drx-OnDurationTimer is used to indicate a period of time at the start of the Uu DRX cycle, that is, the first terminal device starts the drx-OnDurationTimer after the start of the Uu DRX cycle. drx-InactivityTimer is used to indicate a period of time after a DCI indicating a new transmission of DL, UL or SL, that is, the first terminal device starts the sl-drx-InactivityTimer after receiving the DCI indicating a new transmission. drx-RetransmissionTimerDL is used to indicate the maximum time to receive a DCI indicating a DL retransmission, that is, if the DL data is not received successfully, the first terminal device starts the drx-RetransmissionTimerDL and listens to the DCI during the operation of the drx-RetransmissionTimerDL, so that the retransmitted DL data can be received. drx-HARQ-RTT-TimerDL is used to indicate the minimum time before the expected reception of a DCI indicating a DL retransmission, that is, after the first terminal device receives a DL transmission, it starts the drx-HARQ-RTT-TimerDL, and during the operation of the drx-HARQ-RTT-TimerDL, the network device as the sending end will not send a retransmission. After the drx-HARQ-RTT-TimerDL times out, the first terminal device starts the drx-RetransmissionTimerDL.drx-RetransmissionTimerUL is used to indicate the maximum time for receiving a DCI indicating UL retransmission, that is, if the UL data is not sent successfully, the first terminal device starts the drx-RetransmissionTimerUL and listens to the DCI during the operation of the drx-RetransmissionTimerUL, so that the retransmitted UL data can be sent. drx-HARQ-RTT-TimerUL is used to indicate the shortest time before expecting to receive a DCI indicating UL retransmission, that is, after the first terminal device sends a UL transmission, it starts the drx-HARQ-RTT-TimerUL, and during the operation of the drx-HARQ-RTT-TimerUL, the first terminal device will not send a retransmission. After drx-HARQ-RTT-TimerDL times out, the first terminal device starts drx-RetransmissionTimerDL. drx-RetransmissionTimerSL is used to indicate the maximum time to receive a DCI indicating SL retransmission, that is, if the SL data is not transmitted successfully, the first terminal device starts the drx-RetransmissionTimerSL and listens to the DCI during the operation of the drx-RetransmissionTimerSL so that the SL data can be retransmitted. drx-HARQ-RTT-TimerSL is used to indicate the minimum time before expecting to receive a DCI indicating SL retransmission, that is, after the first terminal device sends an SL transmission, it starts the drx-HARQ-RTT-TimerSL. During the operation of the drx-HARQ-RTT-TimerUL, the transmitter will not send a retransmission. After drx-HARQ-RTT-TimerSL times out, the first terminal device starts drx-RetransmissionTimerSL.

[0303] Optionally, the Uu DRX function activation time of the first terminal device may be the running time of at least one of drx-OnDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL or drx-RetransmissionTimerSL.

[0304] For the RRC layer, Figure 1 and Figure 2The second terminal device in the RRC_CONNECTED state usually exists in three states, namely, the RRC_IDLE state, the RRC_INACTIVE state, and the RRC_CONNECTED state. The following explains these three states respectively.

[0305] RRC_CONNECTED state

[0306] If the second terminal device establishes an RRC connection with the network device, the second terminal device is in the RRC_CONNECTED state. In the RRC_CONNECTED state, the second terminal device can establish a user plane and control plane connection with the network device, and the second terminal device can transmit user plane data and control plane signaling with the network device through the first terminal device.

[0307] RRC_IDLE state

[0308] If the second terminal device has not established an RRC connection with the network device, the second terminal device is in the RRC_IDLE state. When the second terminal device is in the RRC_IDLE state, the second terminal device can select a public land mobile network (PLMN); the second terminal device can receive system messages broadcast by the network device through the first terminal device; the second terminal device can reselect a cell; and the second terminal device can receive a paging message or receive indication information for the second terminal device to be paged through the first terminal device.

[0309] RRC_INACTIVE state

[0310] If the second terminal device establishes an RRC connection with the network device, the second terminal device enters the RRC_CONNECTED state. If the second terminal device has no data transmission needs with the network device within the preset time period in the RRC_CONNECTED state, the network device can determine that the second terminal device has entered the RRC_INACTIVE state, and the network device can send an RRC release (RRCRelease with suspend indication) message carrying a suspension indication to the second terminal device through the first terminal device. After the second terminal device receives the RRCRelease with suspend indication message, the second terminal device retains its own context and enters the RRC_INACTIVE state.

[0311] When the second terminal device needs to receive downlink data sent by the network device or send uplink data to the network device, it needs to enter the RRC_CONNECTED state. Figure 4 and Figure 5Describe the process of the second terminal device entering the RRC_CONNECTED state from the RRC_IDLE state. Figure 4 As shown, the following steps are included:

[0312] S410, the second terminal device sends an RRC setup request (RRCSetupRequest) message to the first terminal device.

[0313] Optionally, before S410, the second terminal device is in the RRC_IDLE state. When the second terminal device has uplink data to send to the network device, the second terminal device may be triggered to execute S410.

[0314] Optionally, before S410, when the network device has data to send to the second terminal device, the network device may send a paging message that includes the identifier of the second terminal device. After the first terminal device receives the paging message from the network device, it determines that the identifier carried in the paging message is the identifier of the second terminal device. Therefore, the first terminal device forwards the paging message to the second terminal device, and the second terminal device executes S410 after receiving the paging message from the first terminal device; or the first terminal device sends an indication that the second terminal device is being paged to the second terminal device, and the second terminal device executes S410 after receiving the indication that it is being paged.

[0315] Optionally, the RRC setup request (RRCSetupRequest) message may include at least one of an identifier of the second terminal device or a reason for establishing the RRC connection.

[0316] Optionally, before S410, after a PC5 unicast connection (also called a unicast link) is established between the second terminal device and the first terminal device, the second terminal device may execute S410 if the first terminal device can provide a relay service for the second terminal device. Optionally, after the PC5 unicast connection between the second terminal device and the first terminal device is established, a corresponding PC5 RRC connection is also established. A PC5 RRC connection is a logical connection between a source and a destination pair.

[0317] S420, the first terminal device forwards the RRC setup request (RRCSetupRequest) message from the second terminal device to the network device.

[0318] S430, the network device sends an RRC setup (RRCSetup) message to the first terminal device, and the first terminal device receives the RRC (RRCSetup) message sent by the network device.

[0319] Among them, S430 includes: in response to the RRC setup request (RRCSetupRequest) message, the network device sends an RRC setup (RRCSetup) message to the first terminal device.

[0320] Optionally, the RRC setup (RRCSetup) message includes at least one of radio bearer configuration or cell group configuration.

[0321] S440, the first terminal device forwards the RRC setup (RRCSetup) message in S430 to the second terminal device.

[0322] S450, the second terminal device sends an RRC setup complete (RRCSetupComplete) message to the first terminal device.

[0323] Among them, S450 includes: in response to the RRC setup (RRCSetup) message, the second terminal device sends an RRC setup completion (RRCSetupComplete) message to the first terminal device.

[0324] S460, the first terminal device forwards the RRC setup complete (RRCSetupComplete) message from the second terminal device to the network device.

[0325] After the above S410-S460, the second terminal device enters the RRC_CONNECTED state from the RRC_IDLE state.

[0326] In the above-mentioned process of establishing the RRC connection of the second terminal device, if the speed of sending and receiving messages is faster, the process of establishing the RRC connection is faster. However, it is possible that the SL DRX function of the second terminal device will limit the speed at which the second terminal device receives the RRC establishment (RRCSetup) message in S440, and / or, the SL DRX function of the first terminal device will limit the speed at which the first terminal device receives the RRC establishment request (RRCSetupRequest) message in S410 and the RRC establishment completion (RRCSetupComplete) message in S450, and / or, the Uu function of the first terminal device will limit the speed at which the first terminal device receives the RRC establishment (RRCSetup) message in S430. That is to say, at least one of the SL DRX function of the first terminal device, the Uu DRX function of the first terminal device, or the SL DRX function of the second terminal device may cause the second terminal device to establish an RRC connection more slowly, thereby affecting the transmission delay of the second terminal device. In other words, if the second terminal device establishes an RRC connection slowly, the data between the second terminal device and the network device cannot be transmitted quickly, or if the process of establishing an RRC connection by the second terminal device is too long, it may time out, resulting in a failure to establish an RRC connection. Figure 5 As shown, in S420, after the first terminal device forwards the RRC setup request (RRCSetupRequest) message to the network device, when the network device needs to send the RRC setup (RRCSetup) message in S430 to the first terminal device, the network device needs to send the control information of the RRC setup (RRCSetup) message in S430 during the activation time corresponding to the Uu DRX function of the first terminal device, and the first terminal device monitors the control information during the activation time corresponding to the Uu DRX function. The network device sends the RRC setup (RRCSetup) message of S430 on the resources indicated by the control information, and the first terminal device receives the RRC setup (RRCSetup) message of S430 on the resources indicated by the control information. That is to say, the network device cannot send the control information of the scheduling RRC establishment (RRCSetup) message to the first terminal device immediately after receiving the RRC establishment request (RRCSetupRequest) message in S420. It is necessary to send the control information of the scheduling RRC establishment (RRCSetup) message to the first terminal device within the activation time corresponding to the Uu DRX function of the first terminal device. Only then can the first terminal device receive the RRC establishment (RRCSetup) message of S430 on the resources indicated by the control information. This will increase the delay in establishing the RRC connection for the second terminal device. Figure 5The delay 1 shown, that is, the delay in establishing the RRC connection of the second terminal device will be increased by delay 1 due to the Uu DRX function of the first terminal device. After the first terminal device receives the RRC setup (RRCSetup) message of S430, when forwarding the RRC setup (RRCSetup) message to the second terminal device, it is necessary to send the SCI of the RRC setup (RRCSetup) message scheduled S440 within the activation time corresponding to the SL DRX function of the second terminal device. The second terminal device monitors the SCI within the activation time corresponding to the SL DRX function. The first terminal device sends the RRC setup (RRCSetup) message of S440 on the data channel scheduled by the SCI, and the second terminal device receives the RRC setup (RRCSetup) message of S440 on the resources indicated by the control information. That is to say, the first terminal device cannot send the SCI of the scheduled RRC setup (RRCSetup) message to the second terminal device immediately after receiving the RRC setup (RRCSetup) message. It is necessary to send the SCI of the RRC setup (RRCSetup) message scheduling S440 to the second terminal device within the activation time corresponding to the SL DRX function of the second terminal device. Only then can the second terminal device receive the RRC setup (RRCSetup) message on the data channel scheduled by SCI. This will increase the delay for the second terminal device to establish an RRC connection. Figure 5The delay 2 shown, that is, the delay of the second terminal device in establishing the RRC connection will be increased by delay 2 due to the SL DRX function of the second terminal device. After the second terminal device receives the RRC Setup (RRCSetup) message in S440, when sending the RRC Setup Complete (RRCSetupComplete) message to the first terminal device in S450, the second terminal device needs to send the SCI that schedules the RRC Setup Complete (RRCSetupComplete) message in S450 within the activation time corresponding to the SL DRX function of the first terminal device, and the first terminal device listens to the SCI within the activation time corresponding to the SL DRX function. The second terminal device sends the RRC Setup Complete (RRCSetupComplete) message in S450 on the data channel scheduled by the SCI, and the first terminal device listens to the RRC Setup Complete (RRCSetupComplete) message in S450 on the data channel scheduled by the SCI. That is to say, the second terminal device cannot send the SCI of the scheduled RRC setup completion (RRCSetupComplete) message to the first terminal device immediately after receiving the RRC setup (RRCSetup) message. It is necessary to send the SCI of the scheduled RRC setup completion (RRCSetupComplete) message to the first terminal device within the activation time corresponding to the SL DRX function of the first terminal device. Only then can the first terminal device receive the RRC setup completion (RRCSetupComplete) message in S450 on the data channel scheduled by the SCI. This will increase the delay for the second terminal device to establish an RRC connection. Figure 5 The delay 3 shown, that is, the SLDRX function of the first terminal device will cause the delay of the second terminal device to establish RRC to increase by delay 3.

[0327] That is to say, if the Uu DRX function of the first terminal device exists, the delay for the second terminal device to establish an RRC connection will increase by delay 1; if the SL DRX function of the first terminal device exists, the delay for the second terminal device to establish an RRC connection will increase by delay 3; if the SL DRX function of the second terminal device exists, the delay for the second terminal device to establish an RRC connection will increase by delay 2; if the Uu DRX function of the first terminal device and the SL DRX function of the first terminal device exist, the delay for the second terminal device to establish an RRC connection will increase by delay 1+delay 3; if the Uu DRX function of the first terminal device and the SL DRX function of the second terminal device exist, the delay for the second terminal device to establish an RRC connection will increase by delay 1+delay 2; if the SL DRX function of the first terminal device and the SL DRX function of the second terminal device exist, the delay for the second terminal device to establish an RRC connection will increase by delay 2+delay 3; if the Uu DRX function of the first terminal device, the SL DRX function of the first terminal device and the SL DRX function of the second terminal device exist If the DRX functions exist, the delay for the second terminal device to establish the RRC connection will increase by delay 1 + delay 2 + delay 3. And if the time for the second terminal device to establish the RRC connection exceeds the timer duration, it will cause the RRC connection to fail to be established. Therefore, in order to reduce the delay for the second terminal device to establish the RRC connection or improve the success rate of establishing the RRC connection, it is necessary to enable or release or deactivate the Uu DRX function of the first terminal device, and / or to enable or release or deactivate the SL DRX function of the first terminal device, and / or to enable or release or deactivate the SL DRX function of the second terminal device. In other words, it is necessary to invalidate the Uu DRX function of the first terminal device, and / or to invalidate the SL DRX function of the first terminal device, and / or to invalidate the SL DRX function of the second terminal device; or to make the process of the second terminal device establishing the RRC connection not restricted by the SL DRX function of the first terminal device, and / or not restricted by the SL DRX function of the second terminal device, and / or not restricted by the SL DRX function of the first terminal device.

[0328] The following combination Figure 6 and Figure 7 Describe the process of the second terminal device entering the RRC_CONNECTED state from the RRC_INACTIVE state; Figure 6 As shown, the following steps are included:

[0329] S610, the second terminal device sends an RRC recovery request (RRCResumeRequest) message to the first terminal device.

[0330] Optionally, before S610, the second terminal device is in the RRC_INACTIVE state. When the second terminal device has uplink data to send to the network device, the second terminal device may be triggered to execute S610.

[0331] Optionally, before S610, when the network device has data to send to the second terminal device, the network device may send a paging message that includes the identifier of the second terminal device. After the first terminal device receives the paging message sent by the network device, it determines that the identifier carried in the paging message is the identifier of the second terminal device. Therefore, the first terminal device forwards the paging message to the second terminal device, and the second terminal device executes S610 after receiving the paging message from the first terminal device. Alternatively, the first terminal device sends an indication that the second terminal device is being paged to the second terminal device, and the second terminal device executes S610 after receiving the indication that it is being paged.

[0332] Optionally, the RRC recovery request (RRCResumeRequest) message may include at least one of: a recovery identifier, a recovery integrity message authentication code, or a recovery reason.

[0333] Optionally, before S610, after a PC5 unicast connection (also called a unicast link) is established between the second terminal device and the first terminal device, the second terminal device may execute S610 if the first terminal device can provide a relay service for the second terminal device. Optionally, after the PC5 unicast connection between the second terminal device and the first terminal device is established, a corresponding PC5 RRC connection is also established. A PC5 RRC connection is a logical connection between a source and a destination pair.

[0334] S620, the first terminal device forwards the RRC recovery request (RRCResumeRequest) message from the second terminal device to the network device.

[0335] S630, the network device sends an RRC recovery (RRCResume) message to the first terminal device, and the first terminal device receives the RRC recovery (RRCResume) message sent by the network device.

[0336] Among them, S630 includes: in response to the RRC recovery request (RRCResumeRequest) message, the network device sends an RRC recovery message (RRCResume) to the first terminal device.

[0337] Optionally, the RRC recovery message (RRCResume) includes at least one of radio bearer configuration, cell group configuration or measurement configuration.

[0338] S640, the first terminal device forwards the RRC recovery message (RRCResume) in S630 to the second terminal device.

[0339] S650, the second terminal device sends an RRC recovery complete (RRCResumeComplete) message to the first terminal device.

[0340] Among them, S650 includes: in response to the RRC recovery message (RRCResume), the second terminal device sends an RRC recovery completion (RRCResumeComplete) message to the first terminal device.

[0341] S660, the first terminal device forwards the RRC recovery completion (RRCResumeComplete) message from the second terminal device to the network device.

[0342] After the above S610-S660, the second terminal device enters the RRC_CONNECTED state from the RRC_INACTIVE state.

[0343] In the above-mentioned process of restoring the RRC connection of the second terminal device, if the speed of sending and receiving messages is faster, the process of restoring the RRC connection is faster. However, it is possible that the SL DRX function of the second terminal device will limit the speed at which the second terminal device receives the RRC recovery message (RRCResume) in S640, and / or, the SL DRX function of the first terminal device will limit the speed at which the first terminal device receives the RRC recovery request (RRCResumeRequest) message in S610 and the RRC recovery completion (RRCResumeComplete) message in S650, and / or, the Uu function of the first terminal device will limit the speed at which the first terminal device receives the RRC recovery (RRCResume) message in S630. That is to say, at least one of the SLDRX function of the first terminal device, the Uu DRX function of the first terminal device, or the SL DRX function of the second terminal device may cause the second terminal device to recover the RRC connection more slowly, thereby affecting the transmission delay of the second terminal device. In other words, if the second terminal device recovers the RRC connection slowly, the data between the second terminal device and the network device cannot be transmitted quickly, or if the process of the second terminal device recovering the RRC connection is too long, it may time out, resulting in a failure to recover the RRC connection. Figure 7As shown, in S620, after the first terminal device forwards the RRC recovery request (RRCResumeRequest) message to the network device, when the network device needs to send the RRC recovery (RRCResume) message in S630 to the first terminal device, it needs to send control information for scheduling the RRC recovery (RRCResume) message in S630 within the activation time corresponding to the Uu DRX function of the first terminal device, and the first terminal device monitors the control information within the activation time corresponding to the Uu DRX function. The network device sends the RRC recovery (RRCResume) message of S630 on the resources indicated by the control information, and the first terminal device receives the RRC recovery (RRCResume) message of S630 on the resources indicated by the control information. That is to say, the network device cannot send the control information of the scheduling RRC recovery (RRCResume) message to the first terminal device immediately after receiving the RRC recovery request (RRCResumeRequest) message in S620. It is necessary to send the control information of the scheduling RRC recovery (RRCResume) message to the first terminal device within the activation time corresponding to the Uu DRX function of the first terminal device. Only then can the first terminal device receive the RRC recovery (RRCResume) message of S630 on the resources indicated by the control information. This will cause the delay of the second terminal device to restore the RRC connection to increase. Figure 7The delay 4 shown, that is, the delay of the second terminal device in restoring the RRC connection will be increased by a delay of 4 due to the Uu DRX function of the first terminal device. After the first terminal device receives the RRC recovery (RRCResume) message of S630, when forwarding the RRC recovery (RRCResume) message to the second terminal device, the first terminal device needs to send the SCI of the RRC recovery (RRCResume) message scheduled S640 within the activation time corresponding to the SL DRX function of the second terminal device, the second terminal device monitors the SCI within the activation time corresponding to the SL DRX function, the first terminal device sends the RRC recovery (RRCResume) message of S640 on the data channel scheduled by the SCI, and the second terminal device receives the RRC recovery (RRCResume) message of S640 on the resources indicated by the SCI. That is to say, the first terminal device cannot send the SCI of the scheduled RRC recovery (RRCResume) message to the second terminal device immediately after receiving the RRC recovery (RRCResume) message. It is necessary to send the SCI of the RRC recovery (RRCResume) message in the scheduling S640 to the second terminal device within the activation time corresponding to the SL DRX function of the second terminal device. Only then can the second terminal device receive the RRC recovery (RRCResume) message on the data channel scheduled by the SCI. This will increase the delay of the second terminal device in restoring the RRC connection. Figure 7The delay 5 shown, that is, the SL DRX function of the second terminal device will cause the delay of the second terminal device to restore the RRC connection to increase by a delay of 5. After the second terminal device receives the RRC recovery (RRCResume) message in S640, when sending the RRC recovery complete (RRCResumeComplete) message to the first terminal device in S650, the second terminal device needs to send the SCI that schedules the RRC recovery complete (RRCResumeComplete) message in S650 within the activation time corresponding to the SL DRX function of the first terminal device, and the first terminal device listens to the SCI within the activation time corresponding to the SL DRX function. The second terminal device sends the RRC recovery complete (RRCResumeComplete) message in S650 on the data channel scheduled by the SCI, and the first terminal device listens to the RRC recovery complete (RRCResumeComplete) message in S650 on the data channel scheduled by the SCI. That is to say, the second terminal device cannot send the SCI of the scheduled RRC recovery complete (RRCResumeComplete) message to the first terminal device immediately after receiving the RRC recovery (RRCResume) message. It is necessary to send the SCI of the scheduled RRC recovery complete (RRCResumeComplete) message to the first terminal device within the activation time corresponding to the SL DRX function of the first terminal device. Only then can the first terminal device receive the RRC recovery complete (RRCResumeComplete) message in S650 on the data channel scheduled by SCI. This will cause the delay of the second terminal device to restore the RRC connection to increase. Figure 7 The delay shown is 6, that is, the SL DRX function of the first terminal device will cause the delay of the second terminal device to restore the RRC connection to increase by a delay of 6.

[0344] That is to say, if the Uu DRX function of the first terminal device exists, the delay of the second terminal device in restoring the RRC connection will increase by delay 4; if the SL DRX function of the first terminal device exists, the delay of the second terminal device in restoring the RRC connection will increase by delay 6; if the SL DRX function of the second terminal device exists, the delay of the second terminal device in restoring the RRC connection will increase by delay 5; if the Uu DRX function of the first terminal device and the SL DRX function of the first terminal device exist, the delay of the second terminal device in restoring the RRC connection will increase by delay 4+delay 6; if the Uu DRX function of the first terminal device and the SL DRX function of the second terminal device exist, the delay of the second terminal device in restoring the RRC connection will increase by delay 4+delay 5; if the SL DRX function of the first terminal device and the SL DRX function of the second terminal device exist, the delay of the second terminal device in restoring the RRC connection will increase by delay 5+delay 6; if the Uu DRX function of the first terminal device, the SL DRX function of the first terminal device and the SL DRX function of the second terminal device exist If both DRX functions exist, the delay for the second terminal device to restore the RRC connection will increase by Delay 4 + Delay 5 + Delay 6. And if the time for the second terminal device to restore the RRC connection exceeds the timer length, it will cause the RRC connection to fail to be restored. Therefore, in order to reduce the delay for the second terminal device to restore the RRC connection or improve the success rate of restoring the RRC connection, it is necessary to enable or release the UuDRX function of the first terminal device, and / or to enable or release the SL DRX function of the first terminal device, and / or to enable or release the SL DRX function of the second terminal device. In other words, it is necessary to invalidate the Uu DRX function of the first terminal device, and / or to invalidate the SL DRX function of the first terminal device, and / or to invalidate the SL DRX function of the second terminal device; or to make the process of the second terminal device restoring the RRC connection not restricted by the SL DRX function of the first terminal device, and / or not restricted by the SL DRX function of the second terminal device, and / or not restricted by the SL DRX function of the first terminal device.

[0345] The following combination Figure 8 and Figure 9 Describe the process of initiating RRC re-establishment when the second terminal device is in the RRC_CONNECTED state.

[0346] S810, the second terminal device sends an RRC reestablishment request (RRCReestablishmentRequest) message to the first terminal device.

[0347] Optionally, before S810, the second terminal device is in the RRC_CONNECTED state. When the second terminal device determines that the timing advance (TA) is invalid, that is, the second terminal device is out of sync with the network device, the second terminal device may be triggered to execute S810. Specifically, when the uplink advance timer (TAT) of the second terminal device keeps running, the second terminal device maintains uplink synchronization. When the TAT of the second terminal device times out, the uplink synchronization of the second terminal device fails, and S810 is triggered to execute.

[0348] Optionally, the RRC reestablishment request (RRCReestablishmentRequest) message may include at least one of an identifier of the second terminal device or a reestablishment reason.

[0349] Optionally, before S810, after a PC5 unicast connection (also called a unicast link) is established between the second terminal device and the first terminal device, the first terminal device may provide a relay service for the second terminal device. Optionally, after the PC5 unicast connection between the second terminal device and the first terminal device is established, a corresponding PC5 RRC connection is also established. A PC5 RRC connection is a logical connection between a source and a destination pair.

[0350] S820, the first terminal device forwards the RRC re-establishment request (RRCReestablishmentRequest) message from the second terminal device to the network device.

[0351] S830, the network device sends an RRC re-establishment (RRCReestablishment) message to the first terminal device, and the first terminal device receives the RRC re-establishment (RRCReestablishment) message sent by the network device.

[0352] Among them, S830 includes: in response to the RRC re-establishment request (RRCReestablishmentRequest) message, the network device sends an RRC re-establishment (RRCReestablishment) message to the first terminal device.

[0353] Optionally, the RRC reestablishment (RRCReestablishment) message includes a next hop chaining count (nextHopChainingCount).

[0354] S840, the first terminal device forwards the RRC reestablishment (RRCReestablishment) message in S830 to the second terminal device.

[0355] S850, the second terminal device sends an RRC reestablishment complete (RRCReestablishmentComplete) message to the first terminal device.

[0356] Among them, S850 includes: in response to the RRC reestablishment (RRCReestablishment) message, the second terminal device sends an RRC reestablishment completion (RRCReestablishmentComplete) message to the first terminal device.

[0357] S860, the first terminal device forwards the RRC reestablishment completion (RRCReestablishmentComplete) message from the second terminal device to the network device.

[0358] After the above S810-S860, the second terminal device successfully initiates the re-establishment of the RRC connection in the RRC_CONNECTED state.

[0359] In the process of re-establishing the RRC connection of the above-mentioned second terminal device, if the speed of sending and receiving messages is faster, the process of re-establishing the RRC connection is faster. However, it is possible that the SL DRX function of the second terminal device will limit the speed at which the second terminal device receives the RRC re-establishment (RRCReestablishment) message in S840, and / or, the SL DRX function of the first terminal device will limit the speed at which the first terminal device receives the RRC re-establishment request (RRCReestablishmentRequest) message in S810 and the RRC re-establishment completion (RRCReestablishmentComplete) message in S850, and / or, the Uu function of the first terminal device will limit the speed at which the first terminal device receives the RRC re-establishment (RRCReestablishmentComplete) message in S830. That is to say, at least one of the SL DRX function of the first terminal device, the Uu DRX function of the first terminal device, or the SL DRX function of the second terminal device may cause the second terminal device to re-establish the RRC connection slowly, thereby affecting the transmission delay of the second terminal device. In other words, if the second terminal device re-establishes the RRC connection slowly, the data between the second terminal device and the network device cannot be transmitted quickly, or if the process of the second terminal device re-establishing the RRC connection is too long, it may time out, resulting in a failure to re-establish the RRC connection. Figure 9As shown, in S820, after the first terminal device forwards the RRC Reestablishment Request (RRCReestablishmentRequest) message to the network device, when the network device needs to send the RRC Reestablishment (RRCReestablishment) message in S830 to the first terminal device, it needs to send control information for scheduling the RRC Reestablishment (RRCReestablishment) message in S830 within the activation time corresponding to the Uu DRX function of the first terminal device, and the first terminal device monitors the control information within the activation time corresponding to the Uu DRX function. The network device sends the RRC Reestablishment (RRCReestablishment) message of S830 on the resources indicated by the control information, and the first terminal device receives the RRC Reestablishment (RRCReestablishment) message of S830 on the resources indicated by the control information. That is to say, the network device cannot send the control information of the scheduling RRC re-establishment (RRCReestablishment) message to the first terminal device immediately after receiving the RRC re-establishment request (RRCReestablishmentRequest) message in S820. It is necessary to send the control information of the scheduling RRC re-establishment (RRCReestablishment) message to the first terminal device within the activation time corresponding to the Uu DRX function of the first terminal device. Only then can the first terminal device receive the RRC re-establishment (RRCReestablishment) message of S830 on the resources indicated by the control information. This will cause the delay of the second terminal device to re-establish the RRC connection to increase. Figure 9The delay 7 shown, that is, the delay of the second terminal device re-establishing the RRC connection will be increased by delay 7 due to the Uu DRX function of the first terminal device. After the first terminal device receives the RRC re-establishment (RRCReestablishment) message of S830, when forwarding the RRC re-establishment (RRCReestablishment) message to the second terminal device, the first terminal device needs to send the SCI of the RRC re-establishment (RRCReestablishment) message scheduled S840 within the activation time corresponding to the SL DRX function of the second terminal device, the second terminal device monitors the SCI within the activation time corresponding to the SL DRX function, the first terminal device sends the RRC re-establishment (RRCReestablishment) message of S840 on the data channel scheduled by the SCI, and the second terminal device receives the RRC re-establishment (RRCReestablishment) message of S840 on the resources indicated by the SCI. That is to say, the first terminal device cannot send the SCI of the scheduled RRC reestablishment (RRCReestablishment) message to the second terminal device immediately after receiving the RRC reestablishment (RRCReestablishment) message. It is necessary to send the SCI of the RRC reestablishment (RRCReestablishment) message in scheduling S840 to the second terminal device within the activation time corresponding to the SL DRX function of the second terminal device. Only then can the second terminal device receive the RRC reestablishment (RRCReestablishment) message on the data channel scheduled by SCI. This will cause the delay of the second terminal device to reestablish the RRC connection to increase. Figure 9The delay 8 shown, that is, the delay of the second terminal device in re-establishing the RRC connection will be increased by 8 due to the SL DRX function of the second terminal device. After the second terminal device receives the RRC re-establishment (RRCReestablishment) message in S840, when sending the RRC re-establishment complete (RRCReestablishmentComplete) message to the first terminal device in S850, the second terminal device needs to send the SCI that schedules the RRC re-establishment complete (RRCReestablishmentComplete) message in S850 within the activation time corresponding to the SL DRX function of the first terminal device, and the first terminal device listens to the SCI within the activation time corresponding to the SL DRX function. The second terminal device sends the RRC re-establishment complete (RRCReestablishmentComplete) message in S850 on the data channel scheduled by the SCI, and the first terminal device listens to the RRC re-establishment complete (RRCReestablishmentComplete) message in S850 on the data channel scheduled by the SCI. That is to say, the second terminal device cannot send the SCI of the scheduled RRC re-establishment completion (RRCReestablishmentComplete) message to the first terminal device immediately after receiving the RRC re-establishment (RRCReestablishment) message. It is necessary to send the SCI of the scheduled RRC re-establishment completion (RRCReestablishmentComplete) message to the first terminal device within the activation time corresponding to the SL DRX function of the first terminal device. Only then can the first terminal device receive the RRC re-establishment completion (RRCReestablishmentComplete) message on the data channel scheduled by the SCI. This will cause the delay of the second terminal device to re-establish the RRC connection to increase. Figure 9 The delay 9 shown, that is, the delay of the second terminal device establishing RRC will be increased by delay 9 due to the SL DRX function of the first terminal device.

[0360] That is to say, if the Uu DRX function of the first terminal device exists, the delay for the second terminal device to re-establish the RRC connection will increase by delay 7; if the SL DRX function of the first terminal device exists, the delay for the second terminal device to re-establish the RRC connection will increase by delay 9; if the SL DRX function of the second terminal device exists, the delay for the second terminal device to re-establish the RRC connection will increase by delay 8; if the Uu DRX function of the first terminal device and the SL DRX function of the first terminal device exist, the delay for the second terminal device to re-establish the RRC connection will increase by delay 7+delay 9; if the Uu DRX function of the first terminal device and the SL DRX function of the second terminal device exist, the delay for the second terminal device to re-establish the RRC connection will increase by delay 7+delay 8; if the SL DRX function of the first terminal device and the SL DRX function of the second terminal device exist, the delay for the second terminal device to re-establish the RRC connection will increase by delay 8+delay 9; if the Uu DRX function of the first terminal device, the SL DRX function of the first terminal device and the SL DRX function of the second terminal device exist If the DRX functions exist, the delay for the second terminal device to re-establish the RRC connection will increase by delay 7 + delay 8 + delay 9. And if the time for the second terminal device to re-establish the RRC connection exceeds the timer duration, it will cause the re-establishment of the RRC connection to fail. Therefore, in order to reduce the delay for the second terminal device to re-establish the RRC connection or improve the success rate of establishing the RRC connection, it is necessary to enable or release or deactivate the Uu DRX function of the first terminal device, and / or, to enable or release or deactivate the SL DRX function of the first terminal device, and / or, to enable or release or deactivate the SL DRX function of the second terminal device. In other words, it is necessary to invalidate the Uu DRX function of the first terminal device, and / or, to invalidate the SL DRX function of the first terminal device, and / or, to invalidate the SL DRX function of the second terminal device; or to make the process of the second terminal device re-establishing the RRC connection not restricted by the SL DRX function of the first terminal device, and / or, not restricted by the SL DRX function of the second terminal device, and / or, not restricted by the SL DRX function of the first terminal device.

[0361] It should be noted that Figure 4-Figure 9 In the embodiment, the first terminal device forwards the RRC message between the second terminal device and the network device, which means that the first terminal device forwards the data containing the RRC message through the lower layer below the RRC layer (excluding the RRC layer), and the lower layer below the RRC layer includes the RLC layer, the MAC layer and the PHY layer.

[0362] Combined with the above Figure 4-Figure 9In order to reduce the delay in establishing an RRC connection or restoring an RRC connection or re-establishing an RRC connection, it is necessary to invalidate the Uu DRX function of the first terminal device, and / or invalidate the SL DRX function of the first terminal device, and / or invalidate the SL DRX function of the second terminal device; or to make the process of the second terminal device re-establishing the RRC connection not restricted by the SL DRX function of the first terminal device, and / or not restricted by the SL DRX function of the second terminal device, and / or not restricted by the SL DRX function of the first terminal device. The following is a process for monitoring control information provided in conjunction with an embodiment of the present application.

[0363] In one possible implementation, if the network device configures the Uu DRX function of the first terminal device through additional RRC signaling, the network device can release the Uu DRX function of the first terminal device through additional RRC signaling (such as an RRC reconfiguration message), and the first terminal device no longer detects DCI or PDCCH based on the Uu DRX function of the first terminal device, thereby reducing the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. However, if the network device releases the Uu DRX function of the first terminal device through additional RRC signaling, since it is necessary to select resources for sending additional RRC signaling, and the transmission delay of the additional RRC signaling is large, that is, if additional RRC signaling is used to release the Uu DRX function of the first terminal device, the release will be slower, and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased.

[0364] In one possible implementation, if the network device can configure the SL DRX function of the first terminal device for the first terminal device and the second terminal device respectively, the network device can also release the SL DRX function of the first terminal device through additional RRC signaling (such as an RRC reconfiguration message). For example, the network device sends additional RRC signaling to the first terminal device to release the SL DRX function of the first terminal device, and the network device sends additional RRC signaling to the second terminal device to release the SL DRX function of the first terminal device. In this way, the second terminal device releases the SL DRX function of the first terminal device according to the additional RRC signaling, and the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the first terminal device is not restricted by the SL DRX of the first terminal device when receiving the SCI, thereby reducing the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. However, if the network device releases the SL DRX function of the first terminal device through additional RRC signaling, it is necessary to select resources for sending additional RRC signaling, and the transmission delay of the additional RRC signaling is relatively large. That is to say, if additional RRC signaling is used to release the SL DRX function of the first terminal device, the release will be slower, and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased.

[0365] In another possible implementation, the network device configures the SLDRX function of the first terminal device for the second terminal device, and the network device may also release the SL DRX function of the first terminal device through additional RRC signaling (such as an RRC reconfiguration message), for example, the network device sends additional RRC signaling to the second terminal device to release the SLDRX function of the first terminal device, and then the second terminal device sends PC5 RRC signaling to the first terminal device to release the SLDRX function of the first terminal device, so that the first terminal device releases the SL DRX function of the first terminal device according to the PC5 RRC signaling. Alternatively, the network device may configure the SL DRX function of the first terminal device for the first terminal device, and the network device may also release the SL DRX function of the first terminal device through additional RRC signaling (such as an RRC reconfiguration message), for example, the network device sends additional RRC signaling to the first terminal device to release the SL DRX function of the first terminal device, and the first terminal device sends PC5 RRC signaling to the second terminal device to release the SL DRX function of the first terminal device, so that the second terminal device releases the SL DRX function of the first terminal device according to the PC5 RRC signaling. The SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the first terminal device is not restricted by the SL DRX function of the first terminal device in receiving the SCI, thereby reducing the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. However, if the network device releases the SL DRX function of the first terminal device through additional RRC signaling, since it is necessary to select resources for sending additional RRC signaling, and the transmission delay of the additional RRC signaling is relatively large, that is, if additional RRC signaling is used to release the SL DRX function of the first terminal device, it will result in a slower release and increase the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. The first terminal device or the second terminal device releases the SL DRX function of the first terminal device through PC5 RRC signaling. Since it is necessary to select resources for sending PC5 RRC signaling and the transmission delay of PC5 RRC signaling is large, that is to say, if PC5RRC signaling is used to release the SLDRX function of the first terminal device, the release will be slower and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased.

[0366] In another possible implementation, if the second terminal device is configured with the SL DRX function of the first terminal device, the second terminal device can release the SL DRX function of the first terminal device through PC5 RRC signaling. In this way, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the first terminal device is not restricted by the SL DRX of the first terminal device in receiving the SCI, thereby reducing the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. However, if the SL DRX function of the first terminal device is released through PC5 RRC signaling, since it is necessary to select resources for sending PC5 RRC signaling, and the transmission delay of PC5 RRC signaling is relatively large, that is, if PC5 RRC signaling is used to release the SL DRX function of the first terminal device, the release will be slower, and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased.

[0367] In one possible implementation, if the network device configures the SL DRX function of the second terminal device for the first terminal device and the second terminal device respectively, the network device may also release the SL DRX function of the second terminal device through additional RRC signaling (such as an RRC reconfiguration message), for example, the network device sends additional RRC signaling to the first terminal device to release the SL DRX function of the second terminal device, and the network device sends additional RRC signaling to the second terminal device to release the SL DRX function of the second terminal device. In this way, the first terminal device releases the SL DRX function of the second terminal device according to the additional RRC signaling, and the second terminal device releases the SL DRX function of the second terminal device according to the additional RRC signaling. In this way, the SCI sent by the first terminal device to the second terminal device is not restricted by the SL DRX function of the second terminal device, and the second terminal device is not restricted by the SL DRX of the second terminal device when receiving the SCI, thereby reducing the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. However, if the network device releases the SL DRX function of the second terminal device through additional RRC signaling, it is necessary to select resources for sending additional RRC signaling, and the transmission delay of the additional RRC signaling is relatively large. That is to say, if additional RRC signaling is used to release the SL DRX function of the second terminal device, the release will be slower, and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased.

[0368] In another possible implementation, if the network device configures the SLDRX function of the second terminal device for the first terminal device, the network device may also release the SL DRX function of the second terminal device through additional RRC signaling (such as an RRC reconfiguration message). For example, the network device sends additional RRC signaling to the first terminal device to release the SLDRX function of the second terminal device, and then the first terminal device sends PC5 RRC signaling to the second terminal device to release the SL DRX function of the second terminal device. In this way, the second terminal device releases the SL DRX function of the second terminal device according to the PC5 RRC signaling. The SCI sent by the first terminal device to the second terminal device is not restricted by the SL DRX function of the second terminal device, and the second terminal device is not restricted by the SL DRX function of the second terminal device when receiving the SCI, thereby reducing the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection. However, if the network device releases the SL DRX function of the second terminal device through additional RRC signaling, it is necessary to select resources for sending additional RRC signaling, and the transmission delay of the additional RRC signaling is relatively large. That is, if additional RRC signaling is used to release the SL DRX function of the second terminal device, the release will be slower, and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased. The first terminal device releases the SL DRX function of the second terminal device through PC5 RRC signaling. It is necessary to select resources for sending PC5 RRC signaling, and the transmission delay of PC5 RRC signaling is relatively large. That is, if PC5 RRC signaling is used to release the SL DRX function of the second terminal device, the release will be slower, and the delay for the second terminal device to establish an RRC connection, re-establish an RRC connection, or restore an RRC connection will be increased.

[0369] The following describes a method for monitoring control information provided by an embodiment of the present application. The first device may be the aforementioned first terminal device, and the DRX function of the first device may be the SL DRX function of the first terminal device or the Uu DRX function of the first terminal device. In the case where the DRX function of the first device is the SL DRX function of the first terminal device, the second device may be the second terminal device, and in the case where the DRX function of the first device is the Uu DRX function of the first terminal device, the second device may be a network device. Optionally, the first device may be the aforementioned second terminal device, the DRX function of the first device may be the SL DRX function of the second terminal device, and the second device may be the first terminal device.

[0370] In the method for monitoring control information provided in an embodiment of the present application, if a first condition is met, a first device may release the DRX function of the first device. The DRX function enables the first device to monitor control information during the activation time of discontinuous reception. In this way, when the first device monitors first control information sent by a second device, it is not restricted by the DRX function of the first device. This can reduce the latency of monitoring control information, thereby facilitating improved transmission speed. For example, in scenarios where an RRC connection is established, this can help reduce the latency of establishing the RRC connection; in scenarios where an RRC connection is reestablished, this can help reduce the latency of reestablishing the RRC connection; and in scenarios where an RRC connection is restored, this can help reduce the latency of resuming the RRC connection.

[0371] like Figure 10 FIG. 1 shows a method 1000 for monitoring control information according to an embodiment of the present application. The method 1000 includes:

[0372] S1010: If a first condition is met, the first device releases a DRX function of the first device, where the DRX function of the first device is for the first device to monitor control information within an activation time of discontinuous reception.

[0373] Optionally, the DRX function of the first device is to enable the first device to monitor control information during an active period of discontinuous reception and not monitor control information during an inactive period of discontinuous reception. In other words, to reduce power consumption of the first device, the first device may monitor control information during the active period and not monitor control information during the inactive period.

[0374] Optionally, the inactive time of the discontinuous reception may be a time other than the active time of the discontinuous reception. In other words, after the first device determines the active time, the time other than the active time in the time domain is the inactive time.

[0375] Optionally, the first device releasing the DRX function of the first device can be understood as the DRX function of the first device being invalid, or the DRX function of the first device being disabled, or the DRX function of the first device being deactivated, or the DRX function of the first device being restricted, or the operation of the first device monitoring control information is not restricted by the DRX function of the first device, or the first device continuously monitors the control information, or the first device cannot non-continuously monitor the control information, or the first device monitors the control information at any time.

[0376] Optionally, the first condition may be an explicit or implicit condition. The first condition may be understood as a condition that triggers the first device to release the DRX function of the first device.

[0377] S1020: If the second condition is met, the second device releases the DRX function corresponding to the first device.

[0378] It is understandable that the second device releasing the DRX function corresponding to the first device can be understood as: the second device releasing the DRX function of the local or local first device. After the second device releases the DRX function corresponding to the first device, the operation of the second device sending control information is not restricted by the DRX function of the first device.

[0379] It is understandable that there is no restriction on the order of S1010 and S1020, and S1010 can be performed before, after, or simultaneously with S1020.

[0380] Optionally, the second device releases the DRX function of the first device, which can be understood as: the DRX function of the first device is invalid, or the DRX function of the first device is disabled, or the DRX function of the first device is deactivated, or the DRX function of the first device is restricted, or the operation of the second device to send control information is not restricted by the DRX function of the first device, or the second device can send control information continuously, or the second device can send control information to the first device at any time.

[0381] Optionally, the second condition may correspond to the first condition, or the first condition may correspond to the second condition. In other words, under normal circumstances, the condition that triggers the first device to release the DRX function of the first device corresponds to the condition that triggers the second device to release the DRX function corresponding to the first device. In this way, after the second device releases the DRX function of the first device, it is not necessary to send control information according to the DRX function of the first device. After the first device releases the DRX function of the first device, it is not necessary to receive control information according to the DRX function of the first device. In this way, the sending and receiving control information can be consistent, thereby saving signaling overhead. For example, if the first condition is that the first device sends a message to the second device, the second condition may be that the second device receives the message. For another example, if the first condition is that the first device receives a message sent by the second device, the second condition is that the second device sends the message.

[0382] S1030: The second device sends first control information to the first device, and the first device monitors the first control information.

[0383] Specifically, after the second device releases the DRX function corresponding to the first device, the second device sends the first control information to the first device. After the first device releases the DRX function of the first device, the first device may monitor the first control information. In other words, after the first device and the second device release the DRX function of the first device, the second device may not send control information to the first device based on the DRX function of the first device, and the first device may not monitor control information from the second device based on the DRX function of the first device.

[0384] Optionally, the second device may be a network device, the first device may be a first terminal device, and the first control information may be downlink control information (DCI).

[0385] Optionally, the second device may be a first terminal device, the first device may be a second terminal device, and the first control information may be sidelink control information (SCI) sent by the first terminal device to the second terminal device.

[0386] Optionally, the second device may be a second terminal device, the first device may be a first terminal device, and the first control information may be an SCI sent by the second terminal device to the first terminal device.

[0387] Optionally, the second device sends the first control information to the first device, including: in response to the second device releasing a DRX function corresponding to the first device, the second device sends the first control information to the first device.

[0388] Optionally, the first device monitors the first control information, including: in response to the first device releasing a DRX function of the first device, the first device monitors the first control information.

[0389] Optionally, the first condition for the first device to release the DRX function of the first device and the second condition for the second device to release the DRX function corresponding to the first device may be the same or different, and this embodiment of the present application is not limited.

[0390] Optionally, the method 1000 further includes:

[0391] S1040: The second device sends a data channel to the first device. The first device receives the data channel according to the first control information. The data channel is used to carry the second message.

[0392] Optionally, the second device may send a data channel to the first device according to the first control information.

[0393] Optionally, the first control information may indicate resources for the second device to send a data channel, the second device may send the data channel on the resources indicated by the first control information, and the first device may receive the data channel on the resources indicated by the first control information.

[0394] Optionally, the second message is a message for the second terminal device to enter the RRC connected state. In this way, the process of the second terminal device entering the RRC connected state may not be restricted by the DRX function of the first device.

[0395] In the above solution, the first device can release the DRX function of the first device based on the first condition, and the second device can release the DRX function corresponding to the first device based on the second condition. In this way, when the second device sends the first control information to the first device, it does not need to consider the DRX function of the first device, and when the first device monitors the first control information, it does not need to consider the DRX function of the first device, thereby reducing latency. In particular, when the second message is used to enter the RRC connected state, the latency of entering the RRC connected state can be reduced.

[0396] The following describes the DRX functions of different devices. Figure 11-Figure 15 The first device may be a first terminal device, and the DRX function of the first device may be an SL DRX function of the first terminal device. The first terminal device and the second terminal device release the SL DRX function of the first terminal device. Figures 16-20 The first device may be the second terminal device, the DRX function of the first device may be the SL DRX function of the second terminal device, and the first terminal device and the second terminal device release the SL DRX function of the second terminal device. Figure 21-23 The first device may be a first terminal device, and the DRX function of the first device may be a Uu DRX function of the first terminal device.

[0397] The first terminal device is configured, activated, or enabled with the SL DRX function. The following describes releasing the SL DRX function of the first terminal device.

[0398] like Figure 11 As shown, in the process of establishing an RRC connection, the first terminal device and the second terminal device can release the SL DRX function of the first terminal device, and the first terminal device can be a relay device of the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 11 As shown, the method 1100 includes:

[0399] S1101: A second terminal device sends data on a Uu signaling radio bearer (SRB) 0 of the second terminal device to a first terminal device, and the first terminal device receives the data on the Uu SRB0 of the second terminal device. In one embodiment, the data on the Uu SRB0 of the second terminal device includes an RRC setup request (RRCSetupRequest) message.

[0400] Optionally, S1101 may be replaced by: the second terminal device sends an RRC setup request (RRCSetupRequest) message through the first terminal device. The first terminal device receives the RRC setup request (RRCSetupRequest) message sent by the second terminal device.

[0401] Optionally, S1101 can be replaced by: the second terminal device initiates the RRC establishment process through the first terminal device.

[0402] Optionally, S1101 may be replaced by: the second terminal device sends a data packet to the first terminal device on a PC5 radio link control (RLC) bearer corresponding to Uu SRB0 of the second terminal device. The first terminal device receives the data packet on a PC5 RLC bearer corresponding to Uu SRB0 of the second terminal device.

[0403] Optionally, S1101 may be replaced by: the second terminal device sends a data packet to the first terminal device on a sidelink logical channel corresponding to Uu SRB0. The first terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0404] It can be understood that, before S1102 and S1103 or before method 1100 , the first terminal device is configured or activated or enabled with the SL DRX function.

[0405] S1102, the second terminal device releases the SL DRX function corresponding to the first terminal device.

[0406] Among them, after the second terminal device releases the SL DRX function corresponding to the first terminal device, the second terminal device sending the SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device. That is, the time when the second terminal device sends the SCI to the first terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0407] S1103, the first terminal device releases the SL DRX function of the first terminal device.

[0408] Among them, after the first terminal device releases the SL DRX function of the first terminal device, the operation of the first terminal device receiving SCI is not restricted by the SL DRX function of the first terminal device, that is, the time for the first terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0409] S1104: The first terminal device forwards the data on the Uu SRBO of the second terminal device to the network device, and the network device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO includes an RRC setup request (RRCSetupRequest) message.

[0410] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC setup request (RRCSetupRequest) of the second terminal device has been received. If the network device agrees to establish an RRC connection with the second terminal device, S1105 is executed.

[0411] Optionally, if the network device receives data on the Uu SRB0 of the second terminal device from the first terminal device, and then rejects the second terminal device from establishing an RRC connection, the network device sends the data on the Uu SRB0 of the second terminal device to the first terminal device in S1105, including an RRC Reject message. Therefore, S1107-S1109 do not exist.

[0412] S1105, the network device sends data to the first terminal device on the Uu SRB0 of the second terminal device, and the first terminal device receives the data sent by the network device on the Uu SRB0 of the second terminal device from the network device. The data sent by the network device on the Uu SRB0 of the second terminal device includes an RRC establishment (RRCSetup) message.

[0413] Optionally, S1105 may be replaced by: the first terminal device receives an RRC setup (RRCSetup) message sent from the network device to the second terminal device.

[0414] Optionally, S1105 may be replaced by: the first terminal device receives a data packet at PC5RLC corresponding to Uu SRB0 of the second terminal device.

[0415] Optionally, S1105 can be replaced by the first terminal device receiving a data packet on a sidelink logical channel (sidelink logical channel) corresponding to UuSRB0 of the second terminal device from the network device.

[0416] S1106: The first terminal device forwards data sent by the network device on the Uu SRBO of the second terminal device to the second terminal device, and the second terminal device receives data sent by the network device on the Uu SRBO of the second terminal device from the first terminal device. In one embodiment, the data sent by the network device on the Uu SRBO of the second terminal device includes an RRC Setup message.

[0417] Optionally, S1106 may be replaced by: the first terminal device sends an RRC setup (RRCSetup) message sent by the network device to the second terminal device to the second terminal device. The second terminal device receives the RRC setup (RRCSetup) message sent by the network device from the first terminal device to the second terminal device.

[0418] Optionally, S1106 may be replaced by: the first terminal device sends a data packet on a PC5 RLC bearer corresponding to Uu SRB0 of the second terminal device to the second terminal device. The second terminal device receives a data packet on a PC5 radio link control (RLC) bearer corresponding to Uu SRB0 of the second terminal device.

[0419] Optionally, S1106 may be replaced by: the first terminal device sends a data packet to the second terminal device on a sidelink logical channel corresponding to Uu SRB0 of the second terminal device. The second terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0420] After S1105 , the second terminal device executes S1107 .

[0421] S1107, the second terminal device sends an SCI to the first terminal device, the first terminal device receives the SCI, and the data channel scheduled by the SCI carries an RRC setup complete (RRCSetupComplete) message sent by the second terminal device to the network device.

[0422] It can be understood that the first control information in method 1000 can be the SCI in S1107, and the second message carried by the data channel can be an RRC setup completion (RRCSetupComplete) message for the second terminal device to establish an RRC connection.

[0423] S1108: The second terminal device sends the data on the Uu SRB1 of the second terminal device on the SCI scheduled data channel, and the first terminal device receives the data on the Uu SRB1 of the second terminal device on the SCI scheduled data channel. In one embodiment, the data on the Uu SRB1 of the second terminal device includes an RRC setup complete (RRCSetupComplete) message.

[0424] S1109, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1108 to the network device.

[0425] It should be noted that in method 1100, the order of S1102 and / or S1103 and any step from S1104 to S1106 is not limited, and S1102 and / or S1103 can be performed before, after, or simultaneously with any step from S1104 to S1106.

[0426] In method 1100, the second condition may trigger execution of S1102, and the first condition may trigger execution of S1103. The first condition and the second condition may be different steps in method 1100, and are discussed below in two cases.

[0427] Case 1: The second condition is that in S1101, the second terminal device sends data on Uu SRB0 to the first terminal device, that is, after the second terminal device sends the data on Uu SRB0 of the second terminal device (including the RRCSetupRequest message), S1102 is triggered. The first condition can be that in S1101, the first terminal device receives data on Uu SRB0 of the second terminal device, that is, the first terminal device receives data on Uu SRB0 of the second terminal device, which triggers the execution of S1103; or the second condition is that in S1106, the second terminal device receives data sent by the network device on Uu SRB0 of the second terminal device from the first terminal device, that is, the second terminal device receives data (including the RRCSetup message) sent by the network device on UuSRB0 of the second terminal device from the first terminal device, which triggers the execution of S1102; the first condition is that in S1106, the first terminal device forwards the data sent by the network device on Uu SRB0 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data sent by the network device on Uu SRB0 of the second terminal device to the second terminal device, which triggers the execution of S1103. Alternatively, in S1104, the first condition may be that the first terminal device forwards the data (including the RRCSetupRequest message) on the UuSRB0 of the second terminal device to the network device, that is, the first terminal device triggers the execution of S1103 after forwarding the data (including the RRCSetupRequest message) on the Uu SRB0 of the second terminal device to the network device; or in S1105, the first condition may be that the first terminal device receives the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device from the network device, that is, the first terminal device triggers the execution of S1103 after receiving the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device from the network device; or in S1106, the first condition may be that the first terminal device forwards the data (including the RRCSetup message) sent by the network device on the UuSRB0 of the second terminal device received by the network device to the second terminal device, that is, the first terminal device triggers the execution of S1103 after forwarding the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device received by the network device to the second terminal device. That is to say, after S1101 or S1106, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and after S1101 or S1104 or S1105 or S1106, the SCI monitored by the first terminal device is not restricted by the SL DRX function of the first terminal device.Therefore, in S1107, when the second terminal device sends the SCI to the first terminal device, it is not necessary to send it according to the SL DRX function of the first terminal device, but only needs to execute S1107 immediately after S1106. This can reduce the delay of sending the RRC Setup Complete message, thereby reducing. Figure 5 In this way, the time for establishing the RRC connection of the second terminal device can be shortened by delay 3.

[0428] Case 2: The second condition is the first preset time period after the second terminal device sends data on Uu SRB0 to the first terminal device in S1101, that is, S1102 is triggered after the first preset time period after the second terminal device sends data on Uu SRB0 to the first terminal device. The first condition may be the first preset time period after the first terminal device receives the data on UuSRB0 of the second terminal device in S1101, that is, the first preset time period after the first terminal device receives the data on Uu SRB0 of the second terminal device triggers the execution of S1103; or the second condition may be the first preset time period after the second terminal device receives the data sent by the network device on Uu SRB0 of the second terminal device from the first terminal device in S1106, that is, the first preset time period after the second terminal device receives the data sent by the network device on Uu SRB0 of the second terminal device from the first terminal device, triggers the execution of S1102; the first condition may be the first preset time period after the first terminal device forwards the data sent by the network device on Uu SRB0 of the second terminal device to the second terminal device in S1106, that is, the first preset time period after the first terminal device forwards the data sent by the network device on Uu SRB0 of the second terminal device to the second terminal device, triggers the execution of S1103. Alternatively, in S1104, the first condition may be the first preset time period after the first terminal device forwards the data (including the RRCSetupRequest message) on the Uu SRB0 of the second terminal device to the network device, that is, the first preset time period after the first terminal device forwards the data (including the RRCSetupRequest message) on the Uu SRB0 of the second terminal device to the network device triggers the execution of S1103; or in S1105, the first condition may be the first preset time period after the first terminal device receives the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device from the network device, that is, the first terminal device receives the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device from the network device, that is, the first preset time period after the first terminal device receives the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device from the network device triggers the execution of S1103; or in S1106, the first condition may be the first preset time period after the first terminal device forwards the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data (including the RRCSetup message) sent by the network device on the Uu After the data (including the RRCSetup message) is sent on SRB0, S1103 is executed.That is to say, after the first preset time period after S1101 or S1106, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and in the first preset time period after S1101 or S1104 or S1105 or S1106, the first terminal device monitors SCI and is not restricted by the SL DRX function of the first terminal device. Therefore, in S1107, when the second terminal device sends SCI to the first terminal device, it is not necessary to send it according to the SL DRX function of the first terminal device, but only needs to execute S1107 immediately after S1106. This can reduce the delay in sending the RRC Setup Complete (RRCSetupComplete) message, and therefore, can reduce. Figure 5 In this way, the time for establishing the RRC connection of the second terminal device can be shortened by delay 3.

[0429] It should be noted that, in method 1100, the conditions for the first terminal device and the second terminal device to release the DRX function of the first terminal device may be the same or different, and this embodiment of the application is not limited thereto. For example, S1101 or S1104 or S1105 or S1106 triggers the first terminal device to release the DRX function of the first terminal device, and S1101 or S1106 triggers the second terminal device to release the DRX function of the first terminal device.

[0430] It should also be noted that, in order to describe that after the DRX function of the first terminal device is released, the SCI for sending the scheduling RRC setup completion (RRCSetupComplete) message is not restricted by the DRX function of the first terminal device, method 1100 only describes the SCI for sending the scheduling RRC setup completion (RRCSetupComplete) message. In actual applications, the RRC setup request (RRCSetupRequest) message in S1101 also requires SCI scheduling, and the RRC setup (RRCSetup) message in S1106 also requires SCI scheduling. In order to avoid redundancy, it is not described in detail.

[0431] above Figure 11 The method 1100 describes the process of establishing an RRC connection with the second terminal device. Figure 12Describes the process of the second terminal device restoring the RRC connection. If the second terminal device has no need to transmit data for a long time, the second terminal device can enter the RRC_INACTIVE state. If the second terminal device has the need to transmit data, the second terminal device needs to enter the RRC_CONNECTED state from RRC_INACTIVE. Therefore, in the process of restoring the RRC connection, the first terminal device and the second terminal device can release the SL DRX function of the first terminal device. The first terminal device can be a relay device for the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 12 As shown, the method 1200 includes:

[0432] S1201, the second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC resume request (RRCResumeRequest) message.

[0433] Optionally, S1201 may be replaced by: the second terminal device sends an RRC resume request (RRCResumeRequest) message through the first terminal device. The first terminal device receives the RRC resume request (RRCResumeRequest) message sent by the second terminal device.

[0434] Optionally, S1201 can be replaced by: the second terminal device initiates the RRC recovery process through the first terminal device.

[0435] Optionally, S1201 may be replaced by: the second terminal device sends a data packet to the first terminal device on a PC5 radio link control (RLC) bearer corresponding to Uu SRB0 of the second terminal device. The first terminal device receives the data packet on a PC5 RLC bearer corresponding to Uu SRB0 of the second terminal device.

[0436] Optionally, S1201 may be replaced by: the second terminal device sends a data packet to the first terminal device on a sidelink logical channel corresponding to Uu SRB0. The first terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0437] It can be understood that, before S1202 and S1203 or before method 1200 , the first terminal device is configured or activated or enabled with the SL DRX function.

[0438] S1202: The second terminal device releases the SL DRX function corresponding to the first terminal device.

[0439] Among them, after the second terminal device releases the SL DRX function corresponding to the first terminal device, the second terminal device sending SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device. That is, the time when the second terminal device sends SCI to the first terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0440] S1203, the first terminal device releases the SL DRX function of the first terminal device.

[0441] Among them, after the first terminal device releases the SL DRX function of the first terminal device, the operation of the first terminal device receiving SCI is not restricted by the SL DRX function of the first terminal device, that is, the time for the first terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0442] S1204: The first terminal device forwards the data on the Uu SRBO of the second terminal device to the network device, and the network device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO includes an RRC resume request (RRCResumeRequest) message.

[0443] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC resume request (RRCResumeRequest) message of the second terminal device has been received. If the network device agrees that the second terminal device resumes the RRC connection, S1205 is executed.

[0444] Optionally, if the network device receives the data on the Uu SRB0 of the second terminal device from the first terminal device, and then refuses the second terminal device to restore the RRC connection, the network device sends the data on the Uu SRB0 of the second terminal device to the first terminal device, including an RRC Reject message. Therefore, S1207-S1209 do not exist.

[0445] Optionally, if the network device receives data on Uu SRB0 of the second terminal device from the first terminal device, and then determines to release the RRC connection of the second terminal device, the network device sends the data on Uu SRB1 of the second terminal device to the first terminal device in S1205, including an RRC release (RRCRelease) message. Therefore, S1207-S1209 do not exist.

[0446] S1205, the network device sends data to the first terminal device on the Uu SRB1 of the second terminal device, and the first terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device from the network device. The data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC resume (RRCResume) message.

[0447] Optionally, S1205 may be replaced by: the first terminal device receives an RRC resume (RRCResume) message sent from the network device to the second terminal device.

[0448] Optionally, S1205 may be replaced by: the first terminal device receives a data packet at the PC5RLC corresponding to the Uu SRB1 of the second terminal device.

[0449] Optionally, S1205 may be replaced by the first terminal device receiving a data packet on a sidelink logical channel corresponding to UuSRB1 of the second terminal device from the network device.

[0450] S1206: The first terminal device forwards data sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, and the second terminal device receives data sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device. In one embodiment, the data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC resume (RRCResume) message.

[0451] Optionally, S1206 may be replaced by: the first terminal device sends an RRC resume (RRCResume) message sent by the network device to the second terminal device to the second terminal device. The second terminal device receives an RRC resume (RRCResume) message sent by the network device from the first terminal device to the second terminal device.

[0452] Optionally, S1206 may be replaced by: the first terminal device sends a data packet on the PC5 RLC bearer corresponding to the Uu SRB1 of the second terminal device to the second terminal device, and the second terminal device receives the data packet on the PC5 RLC bearer corresponding to the Uu SRB1 of the second terminal device.

[0453] Optionally, S1206 may be replaced by: the first terminal device sends a data packet to the second terminal device on a sidelink logical channel corresponding to the Uu SRB1 of the second terminal device. The second terminal device receives the data packet on the sidelink logical channel corresponding to the Uu SRB1 of the second terminal device.

[0454] After S1205 , the second terminal device executes S1207 .

[0455] S1207, the second terminal device sends an SCI to the first terminal device, and the data channel scheduled by the SCI carries the RRC recovery completion (RRCResumeComplete) sent by the second terminal device to the network device.

[0456] It can be understood that the first control information in method 1000 can be the SCI in S1207, and the second message carried by the data channel can be the RRC recovery complete (RRCResumeComplete) message used by the second terminal device in S1207 to restore the RRC connection.

[0457] S1208: The second terminal device transmits the data on the Uu SRB1 of the second terminal device on the data channel scheduled by the SCI, and the first terminal device receives the data on the Uu SRB1 of the second terminal device on the data channel scheduled by the SCI. In one embodiment, the data on the Uu SRB1 of the second terminal device includes an RRC recovery complete (RRCResumeComplete) message.

[0458] S1209, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1208 to the network device.

[0459] It should be noted that in method 1200, the order of S1202 and / or S1203 and any step from S1204 to S1206 is not limited, and S1202 and / or S1203 can be performed before, after, or simultaneously with any step from S1204 to S1206.

[0460] In method 1200, the second condition may trigger execution of S1202, and the first condition may trigger execution of S1203. The first condition and the second condition may be different steps in method 1200, and are discussed below in two cases.

[0461] Case 1: The second condition is that in S1201, the second terminal device sends data on Uu SRB0 to the first terminal device, that is, after the second terminal device sends the data on Uu SRB0 of the second terminal device (including the RRCResumeRequest message), S1202 is triggered. The first condition can be that in S1201, the first terminal device receives data on UuSRB0 of the second terminal device, that is, the first terminal device receives data on Uu SRB0 of the second terminal device, which triggers the execution of S1203; or the second condition is that in S1206, the second terminal device receives data sent by the network device on UuSRB1 of the second terminal device from the first terminal device, that is, the second terminal device receives data (including the RRCResume message) sent by the network device on Uu SRB1 of the second terminal device from the first terminal device, which triggers the execution of S1202; the first condition is that in S1206, the first terminal device forwards the data sent by the network device on Uu SRB1 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data sent by the network device on Uu SRB1 of the second terminal device to the second terminal device, which triggers the execution of S1203. Alternatively, in S1204, the first condition may be that the first terminal device forwards the data (including the RRCResumeRequest message) on the UuSRB1 of the second terminal device to the network device, that is, the first terminal device triggers the execution of S1203 after forwarding the data (including the RRCResumeRequest message) on the Uu SRB1 of the second terminal device to the network device; or in S1205, the first condition may be that the first terminal device receives the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device from the network device, that is, the first terminal device triggers the execution of S1203 after receiving the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device from the network device; or in S1206, the first condition may be that the first terminal device forwards the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device received by the network device to the second terminal device, that is, the first terminal device triggers the execution of S1203 after forwarding the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device received by the network device to the second terminal device. That is to say, after S1201 or S1206, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and after S1201 or S1204 or S1205 or S1206, the SCI monitored by the first terminal device is not restricted by the SL DRX function of the first terminal device.Therefore, in S1207, when the second terminal device sends the SCI to the first terminal device, it is not necessary to send it according to the SL DRX function of the first terminal device, but only needs to execute S1207 immediately after S1206. This can reduce the delay in sending the RRC recovery complete (RRCResumeComplete) message, thereby reducing. Figure 7 In this way, the time for restoring the RRC connection of the second terminal device can be shortened by 6.

[0462] Case 2: The second condition is the first preset time period after the second terminal device sends data on Uu SRB0 to the first terminal device in S1201, that is, the second terminal device triggers the execution of S1202 after the first preset time period after sending data on Uu SRB0 to the first terminal device. The first condition may be the first preset time period after the first terminal device receives the data on UuSRB0 of the second terminal device in S1201, that is, the first preset time period after the first terminal device receives the data on Uu SRB0 of the second terminal device triggers the execution of S1203; or the second condition may be the first preset time period after the second terminal device receives the data sent by the network device on Uu SRB1 of the second terminal device from the first terminal device in S1206, that is, the first preset time period after the second terminal device receives the data sent by the network device on Uu SRB1 of the second terminal device from the first terminal device, triggers the execution of S1202; the first condition may be the first preset time period after the first terminal device forwards the data sent by the network device on Uu SRB1 of the second terminal device to the second terminal device in S1206, that is, the first preset time period after the first terminal device forwards the data sent by the network device on Uu SRB1 of the second terminal device to the second terminal device, triggers the execution of S1203. Or in S1204, the first condition may be the first preset time period after the first terminal device forwards the data (including the RRCResumeRequest message) on the Uu SRB0 of the second terminal device to the network device, that is, the first terminal device forwards the data (including the RRCResumeRequest message) on the Uu SRB0 of the second terminal device to the network device, triggering the execution of S1203 after the first preset time period; or in S1205, the first condition may be the first preset time period after the first terminal device receives the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device from the network device, that is, the first terminal device receives the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device from the network device, that is, the first terminal device triggers the execution of S1203 after the first preset time period; or in S1206, the first condition may be the first preset time period after the first terminal device forwards the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device. Execute S1203 after the data (including RRCResume message) is sent on SRB1.That is to say, after the first preset time period after S1201 or S1206, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and in the first preset time period after S1201 or S1204 or S1205 or S1206, the first terminal device monitors SCI and is not restricted by the SL DRX function of the first terminal device. Therefore, in S1207, when the second terminal device sends SCI to the first terminal device, it is not necessary to send it according to the SL DRX function of the first terminal device, but only needs to execute S1207 immediately after S1206. Thereby, the delay in sending the RRC recovery complete (RRCResumeComplete) message can be reduced, and therefore, it can be reduced. Figure 7 In this way, the time for restoring the RRC connection of the second terminal device can be shortened by 6.

[0463] It should be noted that, in method 1200, the conditions for the first terminal device and the second terminal device to release the DRX function of the first terminal device may be the same or different, and this embodiment of the present application is not limited thereto. For example, S1201 or S1204 or S1205 or S1206 triggers the first terminal device to release the DRX function of the first terminal device, and S1201 or S1206 triggers the second terminal device to release the DRX function of the first terminal device.

[0464] It should also be noted that, in order to describe that after the DRX function of the first terminal device is released, the SCI for sending the scheduling RRC recovery completion (RRCResumeComplete) message is not restricted by the DRX function of the first terminal device, method 1200 only describes the SCI for sending the scheduling RRC recovery completion (RRCResumeComplete) message. In actual applications, the RRC recovery request (RRCResumeRequest) message in S1201 also requires SCI scheduling, and the RRC recovery (RRCResume) message in S1206 also requires SCI scheduling. In order to avoid redundancy, it is not described in detail.

[0465] above Figure 11 Method 1100 describes a process for a second terminal device to establish an RRC connection. Figure 12 The method 1200 describes the process of the second terminal device restoring the RRC connection. Figure 13Describe the process of the second terminal device re-establishing the RRC connection. If the second terminal device is in the RRC_CONNECTED state, if the wireless link fails, the second terminal device needs to initiate the re-establishment of the RRC connection, that is, the second terminal device needs to re-enter the RRC_CONNECTED state. Therefore, in the process of re-establishing the RRC connection, the first terminal device and the second terminal device can release the SL DRX function of the first terminal device. The first terminal device can be a relay device for the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 13 As shown, the method 1300 includes:

[0466] S1301, the second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC reestablishment request (RRCReestablishmentRequest) message.

[0467] Optionally, S1301 may be replaced by: the second terminal device sends an RRC reestablishment request (RRCReestablishmentRequest) message through the first terminal device. The first terminal device receives the RRC reestablishment request (RRCReestablishmentRequest) message sent by the second terminal device.

[0468] Optionally, S1301 can be replaced by: the second terminal device initiates the RRC re-establishment process through the first terminal device.

[0469] Optionally, S1301 may be replaced by: the second terminal device sends a data packet to the first terminal device on a PC5 radio link control (RLC) bearer corresponding to Uu SRB0 of the second terminal device. The first terminal device receives the data packet on a PC5 RLC bearer corresponding to Uu SRB0 of the second terminal device.

[0470] Optionally, S1301 may be replaced by: the second terminal device sends a data packet to the first terminal device on a sidelink logical channel corresponding to Uu SRB0. The first terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0471] It can be understood that, before S1302 and S1303 or before method 1300, the first terminal device is configured or activated or enabled with the SL DRX function.

[0472] S1302: The second terminal device releases the SL DRX function corresponding to the first terminal device.

[0473] Among them, after the second terminal device releases the SL DRX function corresponding to the first terminal device, the second terminal device sending the SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device. That is, the time when the second terminal device sends the SCI to the first terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0474] S1303, the first terminal device releases the SL DRX function of the first terminal device.

[0475] Among them, after the first terminal device releases the SL DRX function of the first terminal device, the operation of the first terminal device receiving SCI is not restricted by the SL DRX function of the first terminal device, that is, the time for the first terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0476] S1304: The first terminal device forwards the data on the Uu SRBO of the second terminal device to the network device, and the network device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO includes an RRC Reestablishment Request message.

[0477] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC reestablishment request (RRCReestablishmentRequest) message of the second terminal device has been received. If the network device agrees that the second terminal device restores the RRC connection, S1305 is executed.

[0478] S1305, the network device sends data to the first terminal device on the Uu SRB1 of the second terminal device, and the first terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device from the network device. The data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC Reestablishment message.

[0479] Optionally, S1305 may be replaced by: the first terminal device receives an RRC reestablishment (RRCReestablishment) message sent from the network device to the second terminal device.

[0480] Optionally, S1305 may be replaced by: the first terminal device receives a data packet from the network device, and PC5 RLC corresponding to UuSRB1 of the second terminal device is received.

[0481] Optionally, S1305 may be replaced by the first terminal device receiving a data packet on a sidelink logical channel corresponding to UuSRB1 of the second terminal device from the network device.

[0482] S1306: The first terminal device forwards data sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, and the second terminal device receives data sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device. In one embodiment, the data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC Reestablishment message.

[0483] Optionally, S1306 may be replaced by: the first terminal device sends an RRC reestablishment message sent by the network device to the second terminal device to the second terminal device. The second terminal device receives an RRC reestablishment message sent by the network device from the first terminal device to the second terminal device.

[0484] Optionally, S1306 may be replaced by: the first terminal device forwards the data packet on the PC5 RLC bearer corresponding to the Uu SRB1 of the second terminal device from the network device to the second terminal device. The second terminal device receives the data packet on the PC5 RLC bearer corresponding to the Uu SRB1 of the second terminal device.

[0485] Optionally, S1306 may be replaced by: the first terminal device sends a data packet to the second terminal device on a sidelink logical channel corresponding to the Uu SRB1 of the second terminal device. The first terminal device receives the data packet on the sidelink logical channel corresponding to the Uu SRB1 of the second terminal device.

[0486] After S1302, the second terminal device executes S1307.

[0487] S1307, the second terminal device sends an SCI to the first terminal device, and the data channel scheduled by the SCI carries the SCI of RRC re-establishment completion (RRCReestablishmentComplete) sent by the second terminal device to the network device.

[0488] It can be understood that the first control information in method 1000 can be the SCI in S1307, and the second message carried by the data channel can be an RRC reestablishment complete (RRCReestablishmentComplete) message for the second terminal device to reestablish the RRC connection.

[0489] S1308: The second terminal device sends the data on the Uu SRB1 of the second terminal device on the data channel scheduled by the SCI, and the first terminal device receives the data on the Uu SRB1 of the second terminal device on the data channel scheduled by the SCI. In one embodiment, the data on the Uu SRB1 of the second terminal device includes an RRC Reestablishment Complete message.

[0490] S1309, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1308 to the network device.

[0491] It should be noted that in method 1300, the order of S1302 and / or S1303 and any step from S1304 to S1306 is not limited, and S1202 and / or S1303 can be performed before, after, or simultaneously with any step from S1304 to S1306.

[0492] In method 1300, the second condition may trigger execution of S1302, and the first condition may trigger execution of S1303. The first condition and the second condition may be different steps in method 1300, and are discussed below in two cases.

[0493] Case 1: The second condition is that the second terminal device sends data on Uu SRB0 to the first terminal device in S1301, that is, after the second terminal device sends the data on Uu SRB0 of the second terminal device (including RRCReestablishmentRequest message), S1302 is triggered. The first condition may be that the first terminal device receives data on the Uu SRB0 of the second terminal device in S1301, that is, the first terminal device receives data on the Uu SRB0 of the second terminal device, triggering the execution of S1303; or the second condition may be that the second terminal device receives data sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device in S1306, that is, the second terminal device receives data (including RRCReestablishmente message) sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device, triggering the execution of S1302; the first condition may be that the first terminal device forwards the data sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device in S1306, that is, the first terminal device forwards the data sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, triggering the execution of S1303. Alternatively, in S1304, the first condition may be that the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB1 of the second terminal device to the network device, that is, the first terminal device triggers the execution of S1303 after forwarding the data (including the RRCReestablishmentRequest message) on the Uu SRB1 of the second terminal device to the network device; or in S1305, the first condition may be that the first terminal device receives the data (including the RRCReestablishmente message) sent by the network device on the Uu SRB1 of the second terminal device from the network device, that is, the first terminal device triggers the execution of S1303 after receiving the data (including the RRCReestablishmente message) sent by the network device on the Uu SRB1 of the second terminal device from the network device; or in S1306, the first condition may be that the first terminal device forwards the data (including the RRCReestablishmente message) sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data (including the RRCReestablishmente message) sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data (including the RRCReestablishmente message) received by the network device on the Uu The data sent on SRB1 (including the RRCReestablishmente message) then triggers the execution of S1303.That is to say, after S1301 or S1306, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and after S1301 or S1304 or S1305 or S1306, the first terminal device monitoring SCI is not restricted by the SL DRX function of the first terminal device. Therefore, in S1307, when the second terminal device sends SCI to the first terminal device, it is not necessary to send it according to the DRX function of the first terminal device, but only needs to execute S1307 immediately after S1306. Thereby, the delay in sending the RRC Reestablishment Complete (RRCReestablishmentComplete) message can be reduced, and therefore, it can be reduced. Figure 9 The delay is 9, so that the time for re-establishing the RRC connection of the second terminal device can be shortened by delay 9.

[0494] Case 2: The second condition is the first preset time period after the second terminal device sends data on Uu SRB0 to the first terminal device in S1301, that is, the second terminal device triggers the execution of S1302 after the first preset time period after sending data on Uu SRB0 to the first terminal device. The first condition may be the first preset time period after the first terminal device receives the data on UuSRB0 of the second terminal device in S1301, that is, the first preset time period after the first terminal device receives the data on Uu SRB0 of the second terminal device triggers the execution of S1303; or the second condition may be the first preset time period after the second terminal device receives the data sent by the network device on Uu SRB1 of the second terminal device from the first terminal device in S1306, that is, the first preset time period after the second terminal device receives the data sent by the network device on Uu SRB1 of the second terminal device from the first terminal device, triggers the execution of S1302; the first condition may be the first preset time period after the first terminal device forwards the data sent by the network device on Uu SRB1 of the second terminal device to the second terminal device in S1306, that is, the first preset time period after the first terminal device forwards the data sent by the network device on Uu SRB1 of the second terminal device to the second terminal device, triggers the execution of S1303. Alternatively, in S1304, the first condition may be the first preset time period after the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB0 of the second terminal device to the network device, that is, the first preset time period after the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB0 of the second terminal device to the network device triggers the execution of S1303; or in S1305, the first condition may be the first preset time period after the first terminal device receives the data (including the RRCReestablishment message) sent by the network device on the Uu SRB1 of the second terminal device from the network device, that is, the first terminal device receives the data (including the RRCReestablishment message) sent by the network device on the Uu SRB1 of the second terminal device from the network device, that is, the first preset time period after the first terminal device receives the data (including the RRCReestablishment message) sent by the network device on the Uu SRB1 of the second terminal device from the network device triggers the execution of S1303; or in S1306, the first condition may be the first preset time period after the first terminal device forwards the data (including the RRCReestablishment message) sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device, that is, the first terminal device forwards the data (including the RRCReestablishment message) sent by the network device on the Uu After the data (including the RRCReestablishment message) is sent on SRB1, S1303 is executed.That is to say, after the first preset time period after S1301 or S1306, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and in the first preset time period after S1301 or S1304 or S1305 or S1306, the first terminal device monitors SCI and is not restricted by the SL DRX function of the first terminal device. Therefore, in S1307, when the second terminal device sends SCI to the first terminal device, it is not necessary to send it according to the DRX function of the first terminal device, but only needs to execute S1307 immediately after S1306. Thereby, the delay in sending the RRC Reestablishment Complete (RRCReestablishmentComplete) message can be reduced, and therefore, it can be reduced. Figure 9 The delay is 9, so that the time for re-establishing the RRC connection of the second terminal device can be shortened by 9.

[0495] It should be noted that, in method 1300, the conditions for the first terminal device and the second terminal device to release the DRX function of the first terminal device may be the same or different, and this embodiment of the present application is not limited thereto. For example, S1301 or S1304 or S1305 or S1306 triggers the first terminal device to release the DRX function of the first terminal device, and S1301 or S1306 triggers the second terminal device to release the DRX function of the first terminal device.

[0496] It should also be noted that, in order to describe that after releasing the DRX function of the first terminal device, the SCI for sending the scheduling RRC re-establishment completion (RRCReestablishmentComplete) is not restricted by the DRX function of the first terminal device, method 1300 only describes the SCI for sending the scheduling RRC re-establishment completion (RRCReestablishmentComplete) message. In actual applications, the RRC re-establishment request (RRCReestablishmentRequest) message in S1301 also requires SCI scheduling, and the RRC re-establishment (RRCReestablishment) message in S1306 also requires SCI scheduling. In order to avoid redundancy, it is not described in detail.

[0497] above Figure 11-13 The first terminal device has an RRC connection, the second terminal device has an RRC connection, and the second terminal device has an RRC connection. The second terminal device has an RRC connection, and a step in the process of re-establishing the RRC connection can trigger the release of the SL DRX function of the first terminal device. If the radio link failure (RLF) between the first terminal device and the network device fails, the second terminal device will have to re-establish the RRC connection. Figure 14Describes the SL DRX function of releasing the first terminal device during the process of re-establishing the RRC connection due to RLF between the first terminal device and the network device.

[0498] like Figure 14 As shown, the method 1400 includes:

[0499] S1401, the first terminal device sends first indication information to the second terminal device, the first indication information indicates RLF between the first terminal device and the network device or is used to indicate that RRC re-establishment between the first terminal device and the network device is successful.

[0500] Optionally, the first indication information may also instruct the second terminal device to re-establish the RRC connection.

[0501] Optionally, the first terminal device is configured with or has an SL DRX function activated.

[0502] Optionally, the second terminal device is in RRC_CONNECTED state.

[0503] Optionally, RLF between the first terminal device and the network device. Since the RRC connection between the second terminal device and the network device is established through the RRC connection between the first terminal device and the network device, the first terminal device acts as a relay device for the second terminal device. When the wireless link between the first terminal device and the network device fails, the second terminal device needs to re-establish the RRC connection, that is, the second terminal device needs to re-enter the RRC_CONNECTED state. Therefore, the first indication information can indicate the RLF between the first terminal device and the network device. If the first terminal device and the network device successfully re-establish the RRC connection after the wireless link between the first terminal device and the network device fails, the first indication information can indicate that the RRC re-establishment between the first terminal device and the network device is successful.

[0504] Optionally, the first indication information is also used to indicate the cell information reselected by the first terminal device and / or to indicate parameters for the second terminal device to perform RRC re-establishment.

[0505] Among them, S1401 triggers S1402 and S1403. That is, the first terminal device sends the first indication information to the second terminal device to trigger the first terminal device to release the SL DRX function of the first terminal device, and the second terminal device receives the first indication information from the first terminal device to trigger the second terminal device to release the SL DRX function corresponding to the first terminal device.

[0506] S1402, the first terminal device releases the SL DRX function of the first terminal device.

[0507] Among them, after the first terminal device releases the SL DRX function of the first terminal device, the operation of the first terminal device receiving SCI is not restricted by the SL DRX function of the first terminal device, that is, the time for the first terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0508] S1403: The second terminal device releases the SL DRX function corresponding to the first terminal device.

[0509] Among them, after the second terminal device releases the SL DRX function corresponding to the first terminal device, the second terminal device sending the SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device. That is, the time when the second terminal device sends the SCI to the first terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0510] S1404, the second terminal device sends an SCI to the first terminal device, and the data channel scheduled by the SCI carries an RRC re-establishment request (RRCReestablishmentRequest) message.

[0511] S1405, the second terminal device sends an RRC re-establishment request (RRCReestablishmentRequest) message to the first terminal device on the data channel scheduled by the SCI in S1404, and the first terminal device receives the RRC re-establishment request (RRCReestablishmentRequest) message on the data channel scheduled by the SCI in S1404.

[0512] It can be understood that the first control information in method 1000 may be the SCI in S1404, and the second message carried by the data channel may be an RRC reestablishment request (RRCReestablishmentRequest) message used by the second terminal device to reestablish the RRC connection.

[0513] Optionally, if the first indication information indicates the cell information reselected by the first terminal device and / or the parameters used to instruct the second terminal device to perform RRC re-establishment, the second terminal device may send an RRC re-establishment request (RRCReestablishmentRequest) message according to the cell information reselected by the first terminal device and / or the parameters used for the second terminal device to perform RRC re-establishment indicated by the first indication information.

[0514] Optionally, in S1405, the second terminal device may send data on the Uu SRB0 of the second terminal device to the first terminal device, where the data on the Uu SRB0 of the second terminal device includes an RRC re-establishment request (RRCReestablishmentRequest) message.

[0515] It is understandable that after S1405, you can execute Figure 8 S820-S860 are not described in detail to avoid redundancy.

[0516] Optionally, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the data channel scheduled by the SCI carries the RRC re-establishment request (RRCReestablishmentRequest) message, so the speed of sending the RRC re-establishment request (RRCReestablishmentRequest) message can also be increased. Thereby, the speed of re-establishing the RRC connection can be increased. Optionally, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, so the speed of sending the RRC re-establishment complete (RRCReestablishmentComplete) message can be increased, thereby further increasing the speed of re-establishing the RRC connection. In other words, since both the first terminal device and the second terminal device have released the DRX function of the first terminal device, during the process of the second terminal device re-establishing the RRC connection, Figure 8 The SCIs of S810 and S850 shown are not restricted by the DRX function of the first terminal device, and thus can increase the speed at which the second terminal device re-establishes the RRC connection.

[0517] The following describes that when the second terminal device is in the RRC_IDLE state or the RRC_INACTIVE state, a certain step in the process of the second terminal device being paged triggers the first terminal device and the second terminal device to release the SL DRX function of the first terminal device. The first terminal device can be a relay device of the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 15 As shown, method 1500 includes:

[0518] S1501, the network device sends a paging message, and the first terminal device can receive the paging message.

[0519] Optionally, in S1501, after the network device determines that there is data to be sent to the second terminal device, S1501 may be executed. The paging message includes an identifier of the second terminal device.

[0520] Optionally, the network device may broadcast a paging message, and the first terminal device may receive the paging message.

[0521] Optionally, after the network device determines to page the second terminal device, the network device may send a paging message to the first terminal device, a relay device of the second terminal device, where the paging message includes an identifier of the second terminal device.

[0522] Optionally, the second terminal device is in RRC_IDLE state or RRC_INACTIVE state.

[0523] S1502: The first terminal device indicates to the second terminal device that the second terminal device is paged, or sends a paging message to the second terminal device to page the second terminal device.

[0524] Optionally, after the first terminal device receives the paging message of S1501, it can parse the paging message. Since the paging message includes the identifier of the second terminal device, the first terminal device can send a paging message to the second terminal device to page the second terminal device. In other words, after the first terminal device parses the paging message, it finds that the first terminal device is not paged and the second terminal device is paged, so it forwards the paging message to the second terminal device.

[0525] Optionally, after receiving the paging message of S1501, the first terminal device can parse the paging message. Since the paging message includes the identifier of the second terminal device, the first terminal device determines that the second terminal device is paged. The first terminal device can send an indication to the second terminal device that the second terminal device is paged.

[0526] It can be understood that, before S1503 and S1504 or before method 1500, the first terminal device is configured or activated or enabled with the SL DRX function.

[0527] S1503, the first terminal device releases the SL DRX function of the first terminal device.

[0528] Among them, after the first terminal device releases the SL DRX function of the first terminal device, the operation of the first terminal device receiving SCI is not restricted by the SL DRX function of the first terminal device, that is, the time for the first terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0529] S1504: The second terminal device releases the SL DRX function corresponding to the first terminal device.

[0530] Among them, after the second terminal device releases the SL DRX function corresponding to the first terminal device, the second terminal device sending the SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device. That is, the time when the second terminal device sends the SCI to the first terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the first terminal device.

[0531] S1505, the second terminal device sends an SCI to the first terminal device, and the data channel scheduled by the SCI carries the RRC recovery request (RRCResumeRequest) message sent by the second terminal device to the network device.

[0532] S1506, the second terminal device sends an RRC recovery request (RRCResumeRequest) message to the network device through the first terminal device on the data channel scheduled by the SCI in S1505.

[0533] It can be understood that the first control information in method 1000 can be the SCI in S1504, and the second message carried by the data channel can be an RRC recovery request (RRCResumeRequest) message for the second terminal device to restore the RRC connection.

[0534] Optionally, in S1506, the second terminal device may send data on the Uu SRB0 of the second terminal device to the first terminal device, where the data on the Uu SRB0 of the second terminal device includes an RRC recovery request (RRCResumeRequest) message.

[0535] It is understandable that after S1506, you can execute Figure 6 S620-S660 are not described in detail to avoid redundancy.

[0536] That is to say, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the data channel scheduled by the SCI carries the RRC recovery request (RRCResumeRequest) message sent by the second terminal device to the network device. Therefore, the speed of sending the RRC recovery request (RRCResumeRequest) message can be increased, thereby increasing the speed of restoring the RRC connection. Optionally, the SCI sent by the second terminal device to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the data channel scheduled by the SCI carries the RRC recovery complete (RRCResumeComplete) message sent by the second terminal device to the network device. Therefore, the speed of sending the RRC recovery complete (RRCResumeComplete) message can be increased, thereby further increasing the speed of restoring the RRC connection. In other words, since both the first terminal device and the second terminal device have released the DRX function of the first terminal device, during the process of the second terminal device restoring the RRC connection, Figure 6 The SCIs of S610 and S650 shown are not restricted by the DRX function of the first terminal device, and thus can increase the speed at which the second terminal device recovers the RRC connection.

[0537] As an alternative to S1506, the second terminal device sends an RRC re-establishment request (RRCReestablishmentRequest) message to the network device through the first terminal device on the SCI scheduled data channel, and the SCI scheduled data channel carries the RRC re-establishment request (RRCReestablishmentRequest) message.

[0538] In an alternative embodiment of S1505 and S1506, the first control information in method 1000 may be the SCI in S1505, and the second message carried by the data channel may be an RRC reestablishment request (RRCReestablishmentRequest) message for the second terminal device to reestablish the RRC connection.

[0539] It is understandable that after S1506 is replaced, it can be executed Figure 8 S820-S860 are not described in detail to avoid redundancy.

[0540] Optionally, in an alternative manner to S1506, the second terminal device may send data on the Uu SRB0 of the second terminal device to the first terminal device, where the data on the Uu SRB0 of the second terminal device includes an RRC reestablishment request (RRCReestablishmentRequest) message.

[0541] That is to say, the second terminal device sending SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the data channel scheduled by SCI carries the RRC re-establishment request (RRCReestablishmentRequest) message. Therefore, the speed of sending the RRC re-establishment request (RRCReestablishmentRequest) message can also be increased. Thus, the speed of re-establishing the RRC connection can be increased. Optionally, the second terminal device sending SCI to the first terminal device is not restricted by the SL DRX function of the first terminal device, and the data channel scheduled by SCI carries the RRC re-establishment complete (RRCReestablishmentComplete) message. Therefore, the speed of sending the RRC re-establishment complete (RRCReestablishmentComplete) message can be increased, thereby further increasing the speed of re-establishing the RRC connection. In other words, since both the first terminal device and the second terminal device have released the DRX function of the first terminal device, during the process of the second terminal device re-establishing the RRC connection, Figure 8 The SCIs of S810 and S850 shown are not restricted by the DRX function of the first terminal device, and thus can increase the speed at which the second terminal device re-establishes the RRC connection.

[0542] Optionally, in methods 1100 to 1500, the first terminal device and the second terminal device want to release the SL DRX function of the first terminal device. Specifically, the media access control (MAC) entity or RLC entity of the first terminal device or the second terminal device notifies the RRC entity of the first condition, and the RRC entity releases or disables the SL DRX function of the first terminal device after receiving the first condition. Alternatively, the MAC entity or RLC entity of the first terminal device or the second terminal device notifies the RRC entity of the release or disabling of the SL DRX of the first terminal device, and the RRC entity releases or disables the SL DRX function of the first terminal device. Among them, the MAC entity may also be referred to as the MAC layer, the RLC entity may also be referred to as the RLC layer, and the RRC entity may also be referred to as the RRC layer.

[0543] The second terminal device is configured, activated, or enabled with the SL DRX function. The following describes releasing the SL DRX function of the second terminal device.

[0544] like Figure 16 As shown, in the process of establishing an RRC connection, the first terminal device and the second terminal device can release the SL DRX function of the second terminal device, and the first terminal device can be a relay device of the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 16 As shown, the method 1600 includes:

[0545] S1601: The second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC setup request (RRCSetupRequest) message.

[0546] Optionally, S1601 may be replaced by: the second terminal device sends an RRC setup request (RRCSetupRequest) message through the first terminal device. The first terminal device receives the RRC setup request (RRCSetupRequest) message sent by the second terminal device.

[0547] Optionally, S1601 can be replaced by: the second terminal device initiates the RRC establishment process through the first terminal device.

[0548] Optionally, S1601 may be replaced by: the second terminal device sends a data packet to the first terminal device over the PC5 RLC bearer corresponding to the Uu SRB0 of the second terminal device. The first terminal device receives the data packet over the PC5 RLC bearer corresponding to the Uu SRB0 of the second terminal device.

[0549] Optionally, S1601 may be replaced by: the second terminal device sends a data packet to the first terminal device on the sidelink logical channel corresponding to Uu SRB0. The first terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0550] It is understandable that, before S1602 and S1603 or before method 1600 , the second terminal device is configured or activated or enabled with the SL DRX function.

[0551] S1602, the second terminal device releases the SL DRX function of the second terminal device.

[0552] Among them, after the second terminal device releases the SL DRX function of the second terminal device, the operation of the second terminal device receiving SCI is not restricted by the SL DRX function of the second terminal device, that is, the time for the second terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0553] S1603, the first terminal device releases the SL DRX function corresponding to the second terminal device.

[0554] Among them, after the first terminal device releases the SL DRX function corresponding to the second terminal device, the first terminal device sending the SCI to the second terminal device is not restricted by the SL DRX function of the second terminal device. That is, the time when the first terminal device sends the SCI to the second terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0555] S1604, the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device, where the data on the Uu SRB0 includes an RRC setup request (RRCSetupRequest) message, and the network device receives the data on the Uu SRB0 of the second terminal device.

[0556] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC setup request (RRCSetupRequest) of the second terminal device has been received. If the network device agrees to establish an RRC connection with the second terminal device, S1605 is executed.

[0557] Optionally, if the network device receives data on the Uu SRB0 of the second terminal device from the first terminal device, and then rejects the second terminal device from establishing an RRC connection, the network device sends the data on the Uu SRB0 of the second terminal device to the first terminal device in S1605, including an RRC Reject message. Therefore, S1608 and S1609 do not exist.

[0558] S1605: The network device sends data to the first terminal device over the Uu SRBO of the second terminal device, and the first terminal device receives the data sent by the network device over the Uu SRBO of the second terminal device from the network device. In one embodiment, the data sent by the network device over the Uu SRBO of the second terminal device includes an RRC Setup message.

[0559] Optionally, S1605 may be replaced by: the first terminal device receives an RRC setup (RRCSetup) message sent from the network device to the second terminal device.

[0560] Optionally, S1605 may be replaced by: the first terminal device receives a data packet at PC5RLC corresponding to Uu SRB0 of the second terminal device.

[0561] Optionally, S1605 may be replaced by the first terminal device receiving a data packet on a sidelink logical channel corresponding to UuSRB0 of the second terminal device from the network device.

[0562] S1606, the first terminal device sends an SCI to the second terminal device, and the data channel scheduled by the SCI carries an RRC setup (RRCSetup) message.

[0563] After S1605 , the first terminal device executes S1606 .

[0564] S1607: The first terminal device transmits the data sent by the network device on the second terminal device's Uu SRB0 to the second terminal device on the data channel scheduled by the SCI in S1606, and the second terminal device receives the data sent by the network device on the second terminal device's Uu SRB0 from the first terminal device on the data channel scheduled by the SCI in S1606. In one embodiment, the data sent by the network device on the second terminal device's Uu SRB0 includes an RRC Setup message.

[0565] It can be understood that the first control information in method 1000 can be the SCI that schedules the RRC setup (RRCSetup) message, and the second message carried by the data channel can be the RRC setup (RRCSetup) used by the second terminal device in S1607 to establish the RRC connection.

[0566] S1608, the second terminal device sends the data on the Uu SRB1 of the second terminal device to the first terminal device, where the data on the Uu SRB1 of the second terminal device includes an RRC setup complete (RRCSetupComplete) message.

[0567] S1609, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1608 to the network device.

[0568] It should be noted that in method 1600, the order of S1602 and / or S1603 and any one of steps S1604 and S1605 is not limited, and S1602 and / or S1603 can be performed before, after or simultaneously with any one of steps S1604 and S1605.

[0569] In method 1600, the first condition may trigger execution of S1602, and the second condition may trigger execution of S1603. The first condition and the second condition may be different steps in method 1600, and are discussed below in two cases.

[0570] In case one, the first condition may be that in S1601, the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCSetupRequest message) to the first terminal device, that is, the second terminal device triggers the execution of S1602 after sending the data on the Uu SRB0 of the second terminal device (including the RRCSetupRequest message) to the first terminal device. The second condition may be that the first terminal device receives the data (including the RRCSetupRequest message) on the Uu SRB0 of the second terminal device in S1601, that is, the execution of S1603 is triggered after the data (including the RRCSetupRequest message) on the Uu SRB0 of the second terminal device is received; or in S1604, the second condition may be that the first terminal device forwards the data (including the RRCSetupRequest message) on the Uu SRB0 of the second terminal device to the network device, that is, the execution of S1603 is triggered after the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device; or in S1605, the second condition may be that the first terminal device receives the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device, that is, the execution of S1603 is triggered after the first terminal device receives the data (including the RRCSetup message) sent by the network device on the Uu SRB0 of the second terminal device, that is, the DRX function of the second terminal device is released. That is to say, after S1601, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device. After S1601 or S1604 or S1605, the SCI sent by the first terminal device to the second terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1606, when the first terminal device sends SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device. It only needs to execute S1606 immediately after S1605. This can reduce the delay in sending the RRC Setup message, thereby reducing the time delay of the RRC Setup message. Figure 5 In this way, the time for establishing the RRC connection of the second terminal device can be shortened by delay 2.

[0571] In case 2, the first condition may be that the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device to the first terminal device in S1601 (including the RRCSetupRequest message), that is, the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device to the first terminal device (including the RRCSetupRequest message). The second condition may be that the first preset time period after the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCSetupRequest message) in S1601, that is, the first preset time period after the data on the Uu SRB0 of the second terminal device (including the RRCSetupRequest message) is triggered to execute S1603; or in S1604, the second condition may be that the first preset time period after the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device (including the RRCSetupRequest message), that is, the first preset time period after the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device, that is, the execution of S1603 is triggered to release the DRX function of the second terminal device. That is to say, after the first preset time period after S1601, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device. In the first preset time period after S1601 or S1604, the SCI sent by the second terminal device to the first terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1606, when the first terminal device sends SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device. It is only necessary to execute S1606 immediately after S1605. This can reduce the delay in sending the RRC Setup message, thereby reducing the time delay of the RRC Setup message. Figure 5 In this way, the time for establishing the RRC connection of the second terminal device can be shortened by delay 2.

[0572] It should be noted that, in method 1600, the conditions for the first terminal device and the second terminal device to release the DRX function of the second terminal device may be the same or different, and this embodiment of the present application is not limited thereto. For example, S1601 or S1604 or S1605 triggers the first terminal device to release the DRX function of the second terminal device, and S1601 triggers the second terminal device to release the DRX function of the second terminal device.

[0573] It should also be noted that, in order to describe that after the DRX function of the second terminal device is released, the sending of the RRC setup (RRCSetup) message is not restricted by the DRX function of the second terminal device, method 1600 only describes the SCI for sending the scheduled RRC setup (RRCSetup) message. In actual applications, the RRC setup request (RRCSetupRequest) message in S1601 also requires SCI scheduling, and the RRC setup completion (RRCSetupComplete) message in S1608 also requires SCI scheduling. In order to avoid redundancy, it is not described in detail.

[0574] like Figure 17 As shown, in the process of restoring RRC, the first terminal device and the second terminal device can release the SL DRX function of the second terminal device, and the first terminal device can be a relay device of the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 17 As shown, method 1700 includes:

[0575] S1701, the second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC resume request (RRCResumeRequest) message.

[0576] Optionally, S1701 may be replaced by: the second terminal device sends an RRC resume request (RRCResumeRequest) message through the first terminal device. The first terminal device receives the RRC resume request (RRCResumeRequest) message sent by the second terminal device.

[0577] Optionally, S1701 can be replaced by: the second terminal device initiates the RRC recovery process through the first terminal device.

[0578] Optionally, S1701 may be replaced by: the second terminal device sends a data packet to the first terminal device over the PC5 RLC bearer corresponding to the Uu SRB0 of the second terminal device. The first terminal device receives the data packet over the PC5 RLC bearer corresponding to the Uu SRB0 of the second terminal device.

[0579] Optionally, S1701 may be replaced by: the second terminal device sends a data packet to the first terminal device on the sidelink logical channel corresponding to Uu SRB0. The first terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0580] It is understandable that, before S1702 and S1703 or before method 1700, the second terminal device is configured or activated or enabled with the SL DRX function.

[0581] S1702, the second terminal device releases the SL DRX function of the second terminal device.

[0582] Among them, after the second terminal device releases the SL DRX function of the second terminal device, the operation of the second terminal device receiving SCI is not restricted by the SL DRX function of the second terminal device, that is, the time for the second terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0583] S1703, the first terminal device releases the SL DRX function corresponding to the second terminal device.

[0584] Among them, after the first terminal device releases the SL DRX function corresponding to the second terminal device, the first terminal device sending the SCI to the second terminal device is not restricted by the SL DRX function of the second terminal device. That is, the time when the first terminal device sends the SCI to the second terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0585] S1704, the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device, the data on the Uu SRB0 includes an RRC recovery request (RRCResumeRequest) message, and the network device receives the data on the Uu SRB0 of the second terminal device.

[0586] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC resume request (RRCResumeRequest) message of the second terminal device has been received. If the network device agrees that the second terminal device resumes the RRC connection, S1705 is executed.

[0587] Optionally, if the network device receives the data on the Uu SRB0 of the second terminal device from the first terminal device, and then refuses the second terminal device to restore the RRC connection, the network device sends the data on the Uu SRB0 of the second terminal device to the first terminal device, including an RRC Reject message. Therefore, S1708-S1709 do not exist.

[0588] Optionally, if the network device receives data on Uu SRB0 of the second terminal device from the first terminal device, and then determines to release the RRC connection of the second terminal device, the network device sends the data on Uu SRB1 of the second terminal device to the first terminal device in S1705, including an RRC release (RRCRelease) message. Therefore, S1707-S1709 do not exist.

[0589] S1705: The network device sends data to the first terminal device over the Uu SRB1 of the second terminal device, and the first terminal device receives the data sent by the network device over the Uu SRB1 of the second terminal device from the network device. In one embodiment, the data sent by the network device over the Uu SRB1 of the second terminal device includes an RRC resume (RRCResume) message.

[0590] Optionally, S1705 can be replaced by: the first terminal device receives an RRC resume (RRCResume) message sent from the network device to the second terminal device.

[0591] Optionally, S1705 may be replaced by: the first terminal device receives a data packet at the PC5RLC corresponding to the Uu SRB1 of the second terminal device.

[0592] Optionally, S1705 may be replaced by the first terminal device receiving a data packet on a sidelink logical channel corresponding to UuSRB1 of the second terminal device from the network device.

[0593] S1706, the first terminal device sends SCI to the second terminal device, and the data channel scheduled by SCI carries the RRC recovery (RRCResume) message.

[0594] After S1705 , the first terminal device executes S1706 .

[0595] In step S1707, the first terminal device transmits the data sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device on the data channel scheduled by the SCI in step S1706. The second terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device on the data channel scheduled by the SCI in step S1706. In one embodiment, the data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC resume (RRCResume) message.

[0596] It can be understood that the first control information in method 1000 can be the SCI in S1706, and the second message carried by the data channel can be the RRC recovery (RRCResume) message used by the second terminal device to restore the RRC connection in S1707.

[0597] S1708, the second terminal device sends the data on the Uu SRB1 of the second terminal device to the first terminal device, where the data on the Uu SRB1 of the second terminal device includes an RRC recovery complete (RRCResumeComplete) message.

[0598] S1709, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1708 to the network device.

[0599] It should be noted that in method 1700, the order of S1702 and / or S1703 and any one of steps S1704 and S1705 is not limited, and S1702 and / or S1703 can be performed before, after or simultaneously with any one of steps S1704 and S1705.

[0600] In method 1700, the first condition may trigger execution of S1702, and the second condition may trigger execution of S1703. The first condition and the second condition may be different steps in method 1700, and are discussed below in two cases.

[0601] In case one, the first condition may be that in S1701, the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCResumeRequest message) to the first terminal device, that is, the second terminal device triggers the execution of S1702 after sending the data on the Uu SRB0 of the second terminal device (including the RRCResumeRequest message) to the first terminal device. The second condition may be that the first terminal device receives the data (including the RRCResumeRequest message) on the Uu SRB0 of the second terminal device in S1701, that is, the execution of S1703 is triggered after the data (including the RRCResumeRequest message) on the Uu SRB0 of the second terminal device is received; or in S1704, the second condition may be that the first terminal device forwards the data (including the RRCResumeRequest message) on the Uu SRB0 of the second terminal device to the network device, that is, the execution of S1703 is triggered after the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device; or in S1705, the second condition may be that the first terminal device receives the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device, that is, the execution of S1703 is triggered after the first terminal device receives the data (including the RRCResume message) sent by the network device on the Uu SRB1 of the second terminal device, that is, the DRX function of the second terminal device is released. That is to say, after S1701, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device. After S1701 or S1704 or S1705, the SCI sent by the first terminal device to the second terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1706, when the first terminal device sends SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device. It is only necessary to execute S1706 immediately after S1705. This can reduce the delay in sending the RRC recovery (RRCResume) message, thereby reducing Figure 7 The delay is 5, so that the time to restore the RRC connection of the second terminal device can be shortened by 5.

[0602] In case two, the first condition may be the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device to the first terminal device in S1701 (including the RRCResumeRequest message), that is, the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device to the first terminal device (including the RRCResumeRequest message). The second condition may be the first preset time period after the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCResumeRequest message) in S1701, that is, the first preset time period after the data on the Uu SRB0 of the second terminal device (including the RRCResumeRequest message) is triggered to execute S1703; or in S1704, the second condition may be the first preset time period after the first terminal device forwards the data on the Uu SRB0 of the second terminal device (including the RRCResumeRequest message) to the network device, that is, the first preset time period after the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device. The execution of S1703 is triggered to execute after the first preset time period. That is to say, after the first preset time period after S1701, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device. In the first preset time period after S1701 or S1704, the SCI sent by the second terminal device to the first terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1706, when the first terminal device sends SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device. It is only necessary to execute S1706 immediately after S1705. This can reduce the delay in sending the RRC recovery (RRCResume) message, thereby reducing Figure 7 The delay is 5, so that the time to restore the RRC connection of the second terminal device can be shortened by 5.

[0603] It should be noted that, in method 1700, the conditions for the first terminal device and the second terminal device to release the DRX function of the second terminal device may be the same or different, and this embodiment of the application is not limited thereto. For example, S1701 or S1704 or S1705 triggers the first terminal device to release the DRX function of the second terminal device, and S1701 triggers the second terminal device to release the DRX function of the second terminal device.

[0604] It should also be noted that, in order to describe that after releasing the DRX function of the second terminal device, the sending of the RRC recovery (RRCResume) message is not restricted by the DRX function of the second terminal device, method 1700 only describes the SCI for sending the scheduled RRC recovery (RRCResume) message. In actual applications, the RRC recovery request (RRCResumeRequest) message in S1701 also requires SCI scheduling, and the RRC recovery completion (RRCResumeComplete) message in S1708 also requires SCI scheduling. In order to avoid redundancy, it is not described in detail.

[0605] like Figure 18 As shown, in the process of re-establishing the RRC connection, the first terminal device and the second terminal device can release the SL DRX function of the second terminal device, and the first terminal device can be a relay device of the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 18 As shown, method 1800 includes:

[0606] S1801, the second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC Reestablishment Request message.

[0607] Optionally, S1801 may be replaced by: the second terminal device sends an RRC reestablishment request (RRCReestablishmentRequest) message through the first terminal device. The first terminal device receives the RRC reestablishment request (RRCReestablishmentRequest) message sent by the second terminal device.

[0608] Optionally, S1801 can be replaced by: the second terminal device initiates the RRC re-establishment process through the first terminal device.

[0609] Optionally, S1801 may be replaced by: the second terminal device sends a data packet to the first terminal device over the PC5 RLC bearer corresponding to the Uu SRB0 of the second terminal device. The first terminal device receives the data packet over the PC5 RLC bearer corresponding to the Uu SRB0 of the second terminal device.

[0610] Optionally, S1801 may be replaced by: the second terminal device sends a data packet to the first terminal device on the sidelink logical channel corresponding to Uu SRB0. The first terminal device receives the data packet on the sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0611] It is understandable that, before S1802 and S1803 or before method 1800 , the second terminal device is configured or activated or has the SL DRX function enabled.

[0612] S1802, the second terminal device releases the SL DRX function of the second terminal device.

[0613] Among them, after the second terminal device releases the SL DRX function of the second terminal device, the operation of the second terminal device receiving SCI is not restricted by the SL DRX function of the second terminal device, that is, the time for the second terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0614] S1803, the first terminal device releases the SL DRX function corresponding to the second terminal device.

[0615] Among them, after the first terminal device releases the SL DRX function corresponding to the second terminal device, the first terminal device sending the SCI to the second terminal device is not restricted by the SL DRX function of the second terminal device. That is, the time when the first terminal device sends the SCI to the second terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0616] S1804, the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device, where the data on the Uu SRB0 includes an RRC reestablishment request (RRCReestablishmentRequest) message, and the network device receives the data on the Uu SRB1 of the second terminal device.

[0617] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC reestablishment request (RRCReestablishmentRequest) of the second terminal device has been received. If the network device agrees with the second terminal device to reestablish the RRC connection, S1805 is executed.

[0618] S1805: The network device sends data to the first terminal device over the Uu SRB1 of the second terminal device, and the first terminal device receives the data sent by the network device over the Uu SRB1 of the second terminal device from the network device. In one embodiment, the data sent by the network device over the Uu SRB1 of the second terminal device includes an RRC Reestablishment message.

[0619] Optionally, S1805 may be replaced by: the first terminal device receives an RRC reestablishment (RRCReestablishment) message sent from the network device to the second terminal device.

[0620] Optionally, S1805 may be replaced by: the first terminal device receives a data packet at the PC5RLC corresponding to the Uu SRB1 of the second terminal device.

[0621] Optionally, S1805 may be replaced by the first terminal device receiving a data packet on a sidelink logical channel corresponding to UuSRB1 of the second terminal device from the network device.

[0622] S1806, the first terminal device sends an SCI to the second terminal device, and the data channel scheduled by the SCI carries an RRC reestablishment (RRCReestablishment) message.

[0623] After S1805 , the first terminal device executes S1806 .

[0624] In step S1807, the first terminal device transmits the data sent by the network device on the Uu SRB1 of the second terminal device to the second terminal device on the data channel scheduled by the SCI in step S1806, and the second terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device on the data channel scheduled by the SCI in step S1806. In one embodiment, the data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC reestablishment message.

[0625] It can be understood that the first control information in method 1000 can be the SCI in S1806, and the second message carried by the data channel can be the RRC reestablishment (RRCReestablishment) message used by the second terminal device to reestablish the RRC connection in S1807.

[0626] S1808, the second terminal device sends the data on the Uu SRB1 of the second terminal device to the first terminal device, where the data on the Uu SRB1 of the second terminal device includes an RRC Reestablishment Complete (RRCReestablishmentComplete) message.

[0627] S1809, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1808 to the network device.

[0628] It should be noted that in method 1800, the order of S1802 and / or S1803 and any one of steps S1804 and S1805 is not limited, and S1802 and / or S1803 can be performed before, after or simultaneously with any one of steps S1804 and S1805.

[0629] In method 1800, the first condition may trigger execution of S1802, and the second condition may trigger execution of S1803. The first condition and the second condition may be different steps in method 1800, and are discussed below in two cases.

[0630] In case one, the first condition may be that in S1801, the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) to the first terminal device, that is, the second terminal device triggers the execution of S1802 after sending the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) to the first terminal device. The second condition may be that the first terminal device receives data (including RRCResumeRequest message) on UuSRB0 of the second terminal device in S1801, that is, triggers execution of S1803 after data (including RRCResumeRequest message) on Uu SRB0 of the second terminal device; or in S1804, the second condition may be that the first terminal device forwards data (including RRCReestablishmentRequest message) on Uu SRB0 of the second terminal device to the network device, that is, triggers execution of S1803 after the first terminal device forwards data on Uu SRB0 of the second terminal device to the network device; or in S1805, the second condition may be that the first terminal device receives data (including RRCReestablishment message) sent by the network device on Uu SRB0 of the second terminal device, that is, triggers execution of S1803 after the first terminal device receives data (including RRCReestablishment message) sent by the network device on Uu SRB0 of the second terminal device, that is, releases the DRX function of the second terminal device. That is to say, after S1801, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device, and after S1801 or S1804 or S1805, the SCI sent by the first terminal device to the second terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1806, when the first terminal device sends SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device, but only needs to execute S1806 immediately after S1805. This can reduce the delay in sending the RRC Reestablishment message, thereby reducing Figure 9 The delay is 8, so that the time for re-establishing the RRC connection of the second terminal device can be shortened by the delay 8.

[0631] Case 2: The first condition may be the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device to the first terminal device in S1801 (including the RRCReestablishmentRequest message), that is, the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device to the first terminal device (including the RRCReestablishmentRequest message), triggering the execution of S1802. The second condition may be the first preset time period after the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) in S1801, that is, the first preset time period after the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) is triggered to execute S1803; or in S1804, the second condition may be the first preset time period after the first terminal device forwards the data on the Uu SRB0 of the second terminal device (including the RRCResumeRequest message) to the network device, that is, the first preset time period after the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device, triggering the execution of S1803. That is to say, after the first preset time period after S1801, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device. In the first preset time period after S1801 or S1804, the SCI sent by the second terminal device to the first terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1806, when the first terminal device sends SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device. It is only necessary to execute S1806 immediately after S1805. This can reduce the delay in sending the RRC Reestablishment message, thereby reducing Figure 9 The delay is 8, so that the time for restoring the RRC connection of the second terminal device can be shortened by the delay 8.

[0632] It should be noted that, in method 1800, the conditions for the first terminal device and the second terminal device to release the DRX function of the second terminal device may be the same or different, and this embodiment of the present application is not limited thereto. For example, S1801 or S1804 or S1805 triggers the first terminal device to release the DRX function of the second terminal device, and S1801 triggers the second terminal device to release the DRX function of the second terminal device.

[0633] It should also be noted that, in order to describe that after releasing the DRX function of the second terminal device, the sending of the RRC re-establishment (RRCReestablishment) message is not restricted by the DRX function of the second terminal device, method 1800 only describes that the SCI-scheduled data channel carries the RRC re-establishment (RRCReestablishment) message. In actual applications, the RRC re-establishment request (RRCReestablishmentRequest) in S1801 also needs to be carried by the SCI-scheduled data channel, and the RRC re-establishment completion (RRCReestablishmentComplete) message in S1808 also needs to be carried by the SCI-scheduled data channel. In order to avoid redundancy, it is not described in detail.

[0634] above Figure 16-Figure 18 They are the process of establishing an RRC connection by the second terminal device, the process of restoring the RRC connection by the second terminal device, and a certain step in the process of re-establishing the RRC connection by the second terminal device can trigger the release of the SL DRX function of the second terminal device. If the radio link failure (RLF) between the first terminal device and the network device fails, it will cause the second terminal device to re-establish the RRC connection. Figure 19 Describes the SL DRX function of releasing the second terminal device during the process of re-establishing the RRC connection due to RLF between the first terminal device and the network device.

[0635] like Figure 19 As shown, method 1900 includes:

[0636] S1901, the first terminal device sends first indication information to the second terminal device, the first indication information indicates RLF between the first terminal device and the network device or is used to indicate that RRC re-establishment between the first terminal device and the network device is successful.

[0637] Optionally, the first indication information may also instruct the second terminal device to re-establish the RRC connection.

[0638] Optionally, the second terminal device is configured with or has an SL DRX function activated.

[0639] Optionally, the second terminal device is in RRC_CONNECTED state.

[0640] Optionally, in the case of RLF between the first terminal device and the network device, since the RRC connection between the second terminal device and the network device is established through the RRC connection between the first terminal device and the network device, the first terminal device acts as a relay device for the second terminal device. When the wireless link between the first terminal device and the network device fails, the second terminal device needs to re-establish the RRC connection, that is, the second terminal device needs to re-enter the RRC_CONNECTED state. Therefore, the first indication information can indicate the RLF between the first terminal device and the network device. If the first terminal device and the network device successfully re-establish the RRC connection after the wireless link between the first terminal device and the network device fails, the first indication information can indicate that the RRC re-establishment between the first terminal device and the network device is successful.

[0641] Optionally, the first indication information is also used to indicate the cell information reselected by the first terminal device and / or to indicate parameters for the second terminal device to perform RRC re-establishment.

[0642] Among them, S1901 triggers S1902 and S1903. The first terminal device sends the first indication information to the second terminal device to trigger the first terminal device to release the SL DRX function corresponding to the second terminal device, and the second terminal device receives the first indication information from the first terminal device to trigger the second terminal device to release the SL DRX function of the second terminal device.

[0643] S1902, the second terminal device releases the SL DRX function of the second terminal device.

[0644] Among them, after the second terminal device releases the SL DRX function of the second terminal device, the operation of the second terminal device receiving SCI is not restricted by the SL DRX function of the second terminal device, that is, the time for the second terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0645] S1903, the first terminal device releases the SL DRX function corresponding to the second terminal device.

[0646] Among them, after the first terminal device releases the SL DRX function corresponding to the second terminal device, the first terminal device sending the SCI to the second terminal device is not restricted by the SL DRX function of the second terminal device. That is, the time when the first terminal device sends the SCI to the second terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0647] S1904, the second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRBO of the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC Reestablishment Request message.

[0648] Optionally, if the first indication information indicates the cell information reselected by the first terminal device and / or the parameters used for the second terminal device to perform RRC re-establishment, the second terminal device may execute S1904 according to the cell information reselected by the first terminal device and / or the parameters used for the second terminal device to perform RRC re-establishment indicated by the first indication information.

[0649] S1905, the first terminal device forwards the data on the Uu SRB0 of the second terminal device to the network device, where the data on the Uu SRB0 includes an RRC reestablishment request (RRCReestablishmentRequest) message, and the network device receives the data on the Uu SRB0 of the second terminal device.

[0650] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC reestablishment request (RRCReestablishmentRequest) message of the second terminal device has been received. If the network device agrees with the second terminal device to reestablish the RRC connection, S1906 is executed.

[0651] S1906: The network device sends data to the first terminal device on the Uu SRB1 of the second terminal device, and the first terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device from the network device. In one embodiment, the data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC Reestablishment message.

[0652] Optionally, S1906 may be replaced by: the first terminal device receives an RRC reestablishment (RRCReestablishment) message sent from the network device to the second terminal device.

[0653] Optionally, S1906 may be replaced by: the first terminal device receives a data packet from the network device at PC5 RLC corresponding to UuSRB1 of the second terminal device.

[0654] Optionally, S1906 may be replaced by the first terminal device receiving a data packet on the sidelink logical channel corresponding to UuSRB1 of the second terminal device from the network device.

[0655] After S1903, the first terminal device executes S1907.

[0656] S1907, the first terminal device sends SCI to the second terminal device. The data channel scheduled by SCI carries the data sent by the network device on the Uu SRB1 of the second terminal device. The data on the Uu SRB1 of the second terminal device includes an RRC reestablishment (RRCReestablishment) message.

[0657] It can be understood that the first control information in method 1000 may be the SCI in scheduling S1907. The second message carried by the data channel may be an RRC reestablishment message for the second terminal device to reestablish the RRC connection.

[0658] In step S1908, the first terminal device forwards the data sent by the network device on the Uu SRB1 of the second terminal device in step S1906 to the second terminal device on the data channel scheduled by the SCI in step S1907, and the second terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device from the first terminal device on the data channel scheduled by the SCI. In one embodiment, the data sent by the network device on the Uu SRB1 of the second terminal device includes an RRC reestablishment message.

[0659] Optionally, S1908 may be replaced by: the first terminal device sends an RRC reestablishment (RRCReestablishment) message to the second terminal device. The second terminal device receives the RRC reestablishment (RRCReestablishment) message from the first terminal device.

[0660] Optionally, S1908 may be replaced by: the first terminal device forwards the data packet on the PC5 RLC bearer corresponding to the Uu SRB1 of the second terminal device from the network device to the second terminal device. The second terminal device receives the data packet on the PC5 RLC bearer corresponding to the Uu SRB1 of the second terminal device.

[0661] Optionally, S1908 may be replaced by: the first terminal device sends a data packet to the second terminal device on a sidelink logical channel corresponding to Uu SRB1. The first terminal device receives the data packet on a sidelink logical channel corresponding to Uu SRB0 of the second terminal device.

[0662] The second terminal device receives data sent by the network device on the Uu SRB1 of the second terminal device in S1908. After the network device sends the RRC reestablishment message on the Uu SRB1 of the second terminal device, S1909 is executed.

[0663] S1909, the second terminal device sends data on the Uu SRB1 of the second terminal device to the first terminal device, and the first terminal device receives the data on the Uu SRB1 of the second terminal device. The data on the Uu SRB1 of the second terminal device includes an RRCReestablishmentComplete message.

[0664] S1910, the first terminal device forwards the data on the Uu SRB1 of the second terminal device in S1909 to the network device.

[0665] It should be noted that in method 1900, the order of S1902 and / or S1903 and any step from S1904 to S1906 is not limited, and S1902 and / or S1903 can be performed before, after, or simultaneously with any step from S1904 to S1906.

[0666] In method 1900, the first condition may trigger execution of S1902, and the second condition may trigger execution of S1903. The first condition and the second condition may be different steps in method 1900, and are discussed below in two cases.

[0667] In case one, the first condition may be that the second terminal device receives the first indication information from the first terminal device in S1901, that is, the second terminal device receives the first indication information from the first terminal device to trigger the execution of S1902. The second condition may be that the first terminal device sends the first indication information to the second terminal device in S1901, that is, the first terminal device sends the first indication information to the second terminal device to trigger the execution of S1902; or the first condition may be that the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) to the first terminal device in S1904, that is, the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) to the first terminal device and then triggers the execution of S1902; or the second condition may be that the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) from the second terminal device in S1904, that is, the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) from the second terminal device to trigger the execution of S1903. Or the second condition is that in S1905 the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB0 of the second terminal device to the network device, that is, the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB0 of the second terminal device to the network device, triggering the execution of S1903. Or the second condition is that in S1906 the first terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device, that is, the first terminal device receives the data sent by the network device on the Uu SRB1 of the second terminal device, triggering the execution of S1903. That is to say, after S1901 or S1904, the second terminal device's monitoring of SCI is not restricted by the DRX function of the second terminal device, and after S1901 or S1904 or S1905 or S1906, the SCI sent by the first terminal device to the second terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1907, when the first terminal device sends the SCI to the second terminal device, it is not necessary to send it according to the DRX function of the second terminal device, but only to execute S1907 immediately after S1906. This can reduce the delay in sending the RRC Reestablishment Complete message, thereby reducing the delay in sending the RRC Reestablishment Complete message. Figure 9 The delay is 8, so that the time for re-establishing the RRC connection of the second terminal device can be shortened by the delay 8.

[0668] In case two, the first condition may be the first preset time period after the second terminal device receives the first indication information from the first terminal device in S1901, that is, the second terminal device triggers the execution of S1902 after the first preset time period after receiving the first indication information from the first terminal device. The second condition may be the first preset time period after the first terminal device sends the first indication information to the second terminal device in S1901, that is, the first preset time period after the first terminal device sends the first indication information to the second terminal device triggers the execution of S1902; or the first condition may be the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) to the first terminal device in S1904, that is, the first preset time period after the second terminal device sends the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) to the first terminal device, triggers the execution of S1902; or the second condition may be the first preset time period after the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) from the second terminal device in S1904, that is, the first preset time period after the first terminal device receives the data on the Uu SRB0 of the second terminal device (including the RRCReestablishmentRequest message) from the second terminal device, triggers the execution of S1903. Or the second condition is the first preset time period after the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB0 of the second terminal device to the network device in S1905, that is, the first preset time period after the first terminal device forwards the data (including the RRCReestablishmentRequest message) on the Uu SRB0 of the second terminal device to the network device triggers the execution of S1903. That is to say, after the first preset time period after S1901 or S1904, the second terminal device monitors SCI without being restricted by the DRX function of the second terminal device, and in the first preset time period after S1901 or S1904 or S1905, the SCI sent by the first terminal device to the second terminal device is not restricted by the DRX function of the second terminal device. Therefore, in S1907, when the first terminal device sends SCI to the second terminal device, it does not need to be sent according to the DRX function of the second terminal device, but only needs to execute S1907 immediately after S1906. Thereby, the delay in sending the RRC Reestablishment Complete (RRCReestablishmentComplete) message can be reduced, and therefore, it can be reduced. Figure 9The delay is 8, so that the time for re-establishing the RRC connection of the second terminal device can be shortened by the delay 8.

[0669] It should be noted that, in method 1900, the conditions for the first terminal device and the second terminal device to release the DRX function of the second terminal device may be the same or different, and this embodiment of the present application is not limited thereto. For example, S1901 or S1904 or S1905 or S1906 triggers the first terminal device to release the DRX function of the second terminal device, and S1901 or S1904 triggers the second terminal device to release the DRX function of the first terminal device.

[0670] It should also be noted that, in order to describe that after the DRX function of the second terminal device is released, the SCI of the data on the Uu SRB1 of the second terminal device that sends the scheduling S1906 is not restricted by the DRX function of the first terminal device, and the data on the Uu SRB1 of the second terminal device includes an RRC Reestablishment Request (RRCReestablishmentRequest) message. Therefore, in method 1900, only the SCI for sending the scheduling RRC Reestablishment Request (RRCReestablishmentRequest) message is described. In actual applications, the RRC Reestablishment Request (RRCReestablishmentRequest) message in S1904 also requires SCI scheduling, and the RRC Reestablishment Complete (RRCReestablishmentComplete) message in S1909 also requires SCI scheduling. In order to avoid redundancy, it is not described in detail.

[0671] The following describes that when the second terminal device is in the RRC_IDLE state or the RRC_INACTIVE state, a certain step in the process of the second terminal device being paged triggers the first terminal device and the second terminal device to release the SL DRX function of the second terminal device. The first terminal device can be a relay device of the second terminal device, that is, the first terminal device is a relay terminal device, and the second terminal device is a remote terminal device. Figure 20 As shown, the method 2000 includes:

[0672] S2001, the network device sends a paging message, and the first terminal device can receive the paging message.

[0673] Optionally, in S2001, after the network device determines that there is data to be sent to the second terminal device, S2001 may be executed. The paging message includes an identifier of the second terminal device.

[0674] Optionally, the network device may broadcast a paging message, and the first terminal device may receive the paging message.

[0675] Optionally, after the network device determines to page the second terminal device, the network device may send a paging message to the first terminal device, a relay device of the second terminal device, where the paging message includes an identifier of the second terminal device.

[0676] Optionally, the second terminal device is in RRC_IDLE state or RRC_INACTIVE state.

[0677] S2002: The first terminal device indicates to the second terminal device that the second terminal device is being paged, or sends a paging message to the second terminal device to page the second terminal device.

[0678] Optionally, after the first terminal device receives the paging message of S2001, it can parse the paging message. Since the paging message includes the identifier of the second terminal device, the first terminal device can send a paging message to the second terminal device to page the second terminal device. In other words, after the first terminal device parses the paging message, it finds that the first terminal device is not paged and the second terminal device is paged, so it forwards the paging message to the second terminal device.

[0679] Optionally, after receiving the paging message of S2001, the first terminal device can parse the paging message. Since the paging message includes the identifier of the second terminal device, the first terminal device determines that the second terminal device is paged. The first terminal device can send an indication to the second terminal device that the second terminal device is paged.

[0680] It can be understood that, before S2003 and S2004 or before method 2000, the second terminal device is configured or activated or enabled with the SL DRX function.

[0681] S2003, the second terminal device releases the SL DRX function of the second terminal device.

[0682] Among them, after the second terminal device releases the SL DRX function of the second terminal device, the operation of the second terminal device receiving SCI is not restricted by the SL DRX function of the second terminal device, that is, the time for the second terminal device to monitor SCI is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0683] S2004: The first terminal device releases the SL DRX function corresponding to the second terminal device.

[0684] Among them, after the first terminal device releases the SL DRX function corresponding to the second terminal device, the first terminal device sending the SCI to the second terminal device is not restricted by the SL DRX function of the second terminal device. That is, the time when the first terminal device sends the SCI to the second terminal device is not restricted by the activation time and inactivation time of the SL DRX function of the second terminal device.

[0685] S2005: The second terminal device sends data on the Uu SRBO of the second terminal device to the first terminal device, and the first terminal device receives data on the Uu SRBO of the second terminal device from the second terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC resume request (RRCResumeRequest) message.

[0686] S2006: The first terminal device forwards the data on the Uu SRBO of the second terminal device in S2005 to the network device, and the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device. In one embodiment, the data on the Uu SRBO of the second terminal device includes an RRC resume request (RRCResumeRequest) message.

[0687] After the network device receives the data on the Uu SRBO of the second terminal device from the first terminal device, the network device determines that an RRC resume request (RRCResumeRequest) message of the second terminal device has been received. If the network device agrees that the second terminal device resumes the RRC connection, S2007 is executed.

[0688] Optionally, if the network device receives the data on the Uu SRB0 of the second terminal device from the first terminal device, and then rejects the second terminal device's request to restore the RRC connection, the network device sends the data on the Uu SRB0 of the second terminal device to the first terminal device, including an RRC Reject message. Therefore, S2009-S2011 do not exist.

[0689] Optionally, if the network device releases the RRC connection of the second terminal device after receiving the data on Uu SRB0 from the first terminal device, the network device sends the data on Uu SRB1 of the second terminal device to the first terminal device in S2007, including an RRC release (RRCRelease) message. Therefore, S2009-S2011 do not exist.

[0690] S2007: The network device sends data to the first terminal device over the Uu SRB1 of the second terminal device, and the first terminal device receives the data sent by the network device over the Uu SRB1 of the second terminal device from the network device. In one embodiment, the data sent by the network device over the Uu SRB1 of the second terminal device includes an RRC resume (RRCResume) message.

[0691] Optionally, S2007 may be replaced by: the first terminal device receives an RRC resume (RRCResume) message sent from the network device to the second terminal device.

[0692] Optionally, S2007 may be replaced by: the first terminal device receives a data packet from the network device, and PC5 RLC corresponding to UuSRB1 of the s...

Claims

1. A method for monitoring control information, characterized in that: The method is applicable to a first device and includes: If the first condition is met, releasing a discontinuous reception (DRX) function of the first device, where the DRX function of the first device is that the first device monitors control information during an activation time of the discontinuous reception and does not monitor control information during an inactivation time of the discontinuous reception; In response to releasing the discontinuous reception (DRX) function of the first device, first control information sent by the second device is monitored, where the first control information is used to schedule a data channel.

2. The method according to claim 1, characterized in that The first device is a remote terminal device, and the second device is a relay terminal device; The first condition includes that the first device sends a first message to the network device through the second device; The first message is an RRC establishment request message, an RRC recovery request message, or an RRC re-establishment request message.

3. The method according to claim 2, characterized in that The method further comprises: receiving the data channel from the second device according to the first control information, where the data channel is used to carry a second message; In a case where the first message is the RRC establishment request message, the second message is an RRC establishment message of the first device; In a case where the first message is the RRC recovery request message, the second message is an RRC recovery message of the first device; In the case that the first message is an RRC re-establishment request message, the second message is an RRC re-establishment message of the first device.

4. The method according to claim 1, wherein The first device is a remote terminal device, and the second device is a relay terminal device; The first condition includes the first device receiving first indication information sent by the second device, where the first indication information indicates that a radio link failure RLF between the second device and the network device or a successful RRC connection re-establishment between the second device and the network device.

5. The method according to claim 1, wherein The first device is a relay terminal device, and the second device is a remote terminal device; The first condition includes that the first device receives data on a Uu signaling radio bearer SRB0 from the second device; or The first condition includes that the first device sends data on Uu SRBO from the second device to the network device; or The first condition includes a first preset time period after the first device receives data from the second device on the Uu SRBO; or The first condition includes that the first device receives data sent by the network device on Uu SRBO or Uu SRBl of the second device; or The first condition includes that the first device forwards to the second device data sent by a network device over UuSRB0 or ​​Uu SRB1 of the second device.

6. The method according to claim 5, characterized in that The method further comprises: receiving the data channel from the second device according to the first control information, where the data channel is used to carry a second message; In a case where the data on the Uu SRBO from the second device includes an RRC setup request message, the second message is an RRC setup complete message of the second device; or In a case where the data on the Uu SRBO from the second device includes an RRC re-establishment request message, the second message is an RRC re-establishment completion message of the second device; or In a case where the data on the Uu SRBO from the second device includes an RRC recovery request message, the second message is an RRC recovery complete message of the second device; or In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, the second message is an RRC establishment completion message of the second device; or In a case where the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message, the second message is an RRC recovery complete message of the second device; or In a case where the data sent by the network device on the Uu SRBl of the second device includes an RRC re-establishment message, the second message is an RRC re-establishment complete message of the second device.

7. The method according to claim 1, characterized in that The first device is a relay terminal device, and the second device is a remote terminal device; The first condition includes the first device indicating to the second device that the second device is paged, or the first device sending a paging message to the second device to page the second device; or The first condition includes that the first device sends first indication information to the second device, where the first indication information indicates an RLF between the first device and the network device or a successful re-establishment of an RRC connection between the first device and the network device.

8. The method according to claim 1, characterized in that The first device is a relay terminal device, and the second device is a network device; The first condition includes that the first device receives data on the Uu SRB0 of the remote terminal device, or the first device sends data on the Uu SRB0 of the remote terminal device to the second device.

9. The method according to claim 8, characterized in that The method further comprises: receiving the data channel from the second device according to the first control information, where the data channel is used to carry a second message; In the case where the data on the Uu SRBO of the remote terminal device includes an RRC establishment request message, the second message is an RRC establishment message of the remote terminal device; or, In the case where the data on the Uu SRBO of the remote terminal device includes an RRC recovery request message, the second message is an RRC recovery message of the remote terminal device; or, In a case where the data on the Uu SRB0 of the remote terminal device includes an RRC re-establishment request message, the second message is the RRC re-establishment message of the remote terminal device.

10. A method for monitoring control information, characterized in that: The method is applicable to the second device, comprising: If the second condition is met, releasing a discontinuous reception (DRX) function corresponding to the first device, wherein the DRX function is that the first device monitors control information during an active time of the discontinuous reception and does not monitor control information during an inactive time of the discontinuous reception; In response to releasing a discontinuous reception (DRX) function corresponding to a first device, first control information is sent to the first device, where the first control information is used to schedule a data channel.

11. The method according to claim 10, characterized in that The second device is a relay terminal device, and the first device is a remote terminal device; The second condition includes the second device receiving data on the Uu signaling radio bearer SRB0 of the first device from the first device.

12. The method according to claim 11, characterized in that The method further comprises: Sending the data channel to the first device, where the data channel is used to carry the second message; In a case where the data on the Uu SRBO of the first device includes an RRC establishment request message, the second message is an RRC establishment message of the first device; or, In a case where the data on the Uu SRBO of the first device includes an RRC recovery request message, the second message is an RRC recovery message of the first device; or, In a case where the data on the Uu SRBO of the first device includes an RRC re-establishment request message, the second message is an RRC re-establishment message of the first device.

13. The method according to claim 10, characterized in that The second device is a relay terminal device, and the first device is a remote terminal device; The second condition includes that the second device sends first indication information to the first device, where the first indication information indicates that a radio link failure RLF between the second device and the network device or a successful RRC connection re-establishment between the second device and the network device.

14. The method according to claim 10, characterized in that The second device is a remote terminal device, and the first device is a relay terminal device; The second condition includes that the second device sends data on the Uu SRBO of the second device to the first device; or The second condition includes a first preset time period after the second device sends data on the Uu SRBO of the second device to the first device; or The second condition includes that the second device receives, from the first device, data sent by a network device over Uu SRBO of the second device or data sent over Uu SRBl.

15. The method according to claim 14, characterized in that The method further comprises: Sending the data channel to the first device, where the data channel is used to carry the second message; In a case where the data on the Uu SRBO of the second device includes an RRC establishment request message, the second message is an RRC establishment completion message of the second device; or, In a case where the data on the Uu SRBO of the second device includes an RRC recovery request message, the second message is an RRC recovery complete message of the second device; or, In a case where the data on the Uu SRBO of the second device includes an RRC re-establishment request message, the second message is an RRC re-establishment completion message of the second device; or, In a case where the data sent by the network device on the Uu SRBO of the second device includes an RRC establishment message, the second message is an RRC establishment completion message of the second device; or In a case where the data sent by the network device on the Uu SRB1 of the second device includes an RRC recovery message, the second message is an RRC recovery complete message of the second device; or, In a case where the data sent by the network device over the Uu SRBO of the second device includes an RRC re-establishment message, the second message is an RRC re-establishment completion message of the second device.

16. The method according to claim 10, characterized in that The second device is a remote terminal device, and the first device is a relay terminal device; The second condition includes learning from the first device that the second device is paged, or receiving from the first device a paging message for paging the second device; or, The second condition includes receiving first indication information from the first device, where the first indication information indicates an RLF between the first device and a network device or a successful RRC connection re-establishment between the first device and the network device.

17. The method according to claim 10, wherein: The first device is a relay terminal device, and the second device is a network device; The second condition includes that the second device receives data on the Uu SRBO of a remote terminal device from the first device.

18. The method according to claim 17, characterized in that The method further comprises: Sending the data channel to the first device, where the data channel is used to carry the second message; In the case where the data on the Uu SRBO of the remote terminal device includes an RRC establishment request message, the second message is an RRC establishment message of the remote terminal device; or, In the case where the data on the Uu SRBO of the remote terminal device includes an RRC recovery request message, the second message is an RRC recovery message of the remote terminal device; or, In a case where the data on the Uu SRB0 of the remote terminal device includes an RRC re-establishment request message, the second message is the RRC re-establishment message of the remote terminal device.

19. A communication device, characterized in that: The method comprises a processor and a memory, wherein the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer program or instructions in the memory, so that the method according to any one of claims 1 to 9 is executed.

20. A communication device, characterized in that: The method comprises a processor and a memory, wherein the processor is coupled to the memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer program or instructions in the memory, so that the method according to any one of claims 10 to 18 is executed.

21. A computer-readable storage medium, characterized in that A program or instruction for implementing the method according to any one of claims 1 to 9 is stored.

22. A computer-readable storage medium, characterized in that A program or instruction for implementing the method according to any one of claims 10 to 18 is stored.

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