Method, device and communication system for transmitting and receiving information

Abstract

In an embodiment of the present invention, an apparatus for transmitting and receiving information, which is applied to a first terminal device (remote UE), is provided, the apparatus including a first transceiver unit, which is configured as follows: establishes a PC5 connection with a second terminal device (relay UE); and the first transceiver unit receives at least one of a radio resource control resume (RRC) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message via the second terminal device (relay UE) by default configuration.

Description

[Technical Field]

[0001] The present invention relates to the field of communications. [Background technology]

[0002] 5G Release 17 (R17) is researching sidelink relay (SL relay) technology, which includes a scenario in which a terminal device (e.g., a UE (also known as terminal equipment)) relays to a network device (UE-to-Network Relay). The relay terminal device (relay UE) uses a New Air Interface (NR) Uu link on its Uu interface, and an NR sidelink link is assumed to be used on the PC5 interface between the remote terminal device (remote UE) and the relay UE. In a UE-to-Network Relay scenario, the relay UE is also referred to as a UE-to-Network relay UE.

[0003] FIG. 1 illustrates a relay scenario from a terminal device to a network device.

[0004] As shown in Scenario 1 of FIG. 1, the remote UE 101 is out of coverage (OOC) of the network device 100, and the relay UE 102 is in coverage (IC) of the network device 100.

[0005] As shown in scenario 2 of FIG. 1, a remote UE 101 is in coverage (IC) of the network device 100, and a relay UE 102 is in coverage (IC) of the network device 100.

[0006] As shown in scenario 3 of FIG. 1, remote UE 101 is in coverage (IC) of network device 100a, relay UE 102 is in coverage (IC) of network device 100, and network device 100a is different from network device 100.

[0007] The Release 17 Layer 2 Sidelink Relay (R17 L2 SL relay) protocol stack introduces the Sidelink Relay Adaptation Protocol (SRAP). For UE-to-Network relay, at the PC5 and Uu interfaces, the SRAP sublayers are all above the Radio Link Control (RLC) sublayer for the control and user plane protocol stacks. The Uu Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP), and Radio Resource Control (RRC) are terminated between the remote UE and the network device (e.g., gNB), while the SRAP, RLC, Medium Access Control (MAC), and Physical (PHY) layers are terminated on each link (i.e., the link between the remote UE and relay UE and the link between the relay UE and gNB).

[0008] FIG. 2 is a diagram showing the control plane protocol stack of UE-to-Network relay.

[0009] In the case of UE-to-Network relay, the SRAP sublayer on the PC5 interface is used only for bearer mapping purposes. For relaying messages on the remote UE's Broadcast Control Channel (BCCH) and Paging Control Channel (PCCH), the SRAP sublayer does not appear in the PC5 hop. For messages on the remote UE's Signaling Radio Bearer 0 (SRB0), the SRAP sublayer does not appear in the PC5 hop, but the SRAP sublayer does appear in the Uu hop for downlink (DL) and uplink (UL).

[0010] In the case of L2 UE-to-Network relay, in the uplink: - The Uu SRAP sublayer supports uplink bearer mapping between ingress PC5 radio link control channels (PC5 RLC channels) used for relay and egress Uu RLC channels on the Relay UE Uu interface; The Uu SRAP sublayer supports remote UE identification for uplink traffic. In the uplink, the Uu SRAP header includes the ID information of the remote UE's Uu Radio Bearer and one local remote UE ID, allowing the gNB to associate received data packets for a specific PDCP entity with the remote UE's correct Uu Radio Bearer; - the PC5 SRAP sublayer of the Relay UE supports uplink (UL) bearer mapping between the Uu radio bearer of the remote UE and the egress Uu RLC channel; and - The PC5 SRAP sublayer of the remote UE supports UL bearer mapping between the Uu radio bearer of the remote UE and the egress PC5 RLC channel.

[0011] In the case of L2 UE-to-Network relay, in the downlink, - The Uu SRAP sublayer on the gNB side supports DL bearer mapping, mapping end-to-end radio bearers (e.g., SRBs and / or DRBs) of the remote UE to Uu RLC channels on the Uu interface of the relay UE; - The Uu SRAP sublayer supports remote UE identification for downlink traffic. In the downlink, the gNB places the indicator information of the remote UE's Uu radio bearer and one local remote UE ID in the Uu SRAP header, so that the relay UE can map data packets received from the remote UE's Uu radio bearer to the associated PC5 RLC channel; and - The PC5 SRAP sublayer of the Relay UE supports downlink bearer mapping between the Uu radio bearer of the remote UE and the egress PC5 RLC channel.

[0012] It should be noted that the introduction of the above background art is intended to clearly and completely explain the technical solutions of the present invention and to facilitate understanding by those skilled in the art, and these technical solutions described in the background art of the present invention should not be construed as being known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0013] In UE-to-Network relay, a Remote UE can access a network device through a relay UE and communicate with the network device via the relay UE. Figure 3 shows an RRC connection establishment procedure when a Remote UE accesses a network device through a relay UE, and the RRC connection re-establishment and RRC resume procedures are similar.

[0014] As shown in Figure 3, the RRC connection establishment procedure includes the following operations (steps): The procedure is described as follows:

[0015] 1. The Remote UE and Relay UE perform a discovery procedure and establish a PC5-RRC connection using the NR V2X procedure.

[0016] 2. The Remote UE sends a first RRC message (e.g., RRCSetupRequest) to establish a connection between the Remote UE and the gNB via the Relay UE, using the specified PC5 RLC bearer configuration. If the Relay UE is not in RRC connected mode (RRC_CONNECTED), the Relay UE must perform its own connection establishment upon receiving the message on the specified PC5 RLC bearer. The gNB responds with an RRCSetup message to the Remote UE. This RRCSetup transmission to the Remote UE uses the specified PC5 RLC bearer configuration.

[0017] 3. The gNB and Relay UE perform a relay channel establishment procedure on the Uu interface. Based on the gNB configuration, the Relay UE and remote UE establish an RLC channel for relaying SRB1 from the PC5 interface to the remote UE.

[0018] 4. The Remote UE sends an RRC Setup Complete message to the gNB using the relay channel of SRB1 on PC5 and the SRB1 relay channel on Uu configured for the relay UE, after which the Remote UE has an RRC connection on the Uu interface.

[0019] 5. The remote UE and gNB establish security according to the Uu interface procedure, and the security message is forwarded by the relay UE.

[0020] 6. The gNB sends an RRC Reconfiguration message to the Remote UE via the relay UE, thereby establishing SRB2 / DRBs for relaying. The Remote UE responds by sending an RRC Reconfiguration Complete message to the gNB via the relay UE. The gNB also establishes an additional RLC bearer or channel between the gNB and the relay UE for relaying traffic.

[0021] Regarding the procedure of Figure 3, the relevant settings of the SRAP are included in the RRC Reconfiguration message (corresponding to operation 6 in Figure 3), and for SRB0, no SRAP appears on the PC5 interface; for other SRBs (e.g., SRB1 or SRB2) and DRBs, an SRAP appears on the PC5 interface by default, i.e., using the bearer mapping function of the SRAP.

[0022] The inventors of the present invention have discovered that in the procedure shown in Figure 3, an RRC setup complete message is sent using SRB1, and according to the prior art, the SRAP function must be used on PC5; in the RRC re-establishment and RRC resume procedures, the RRC re-establishment message, the RRC re-establishment complete message, the RRC resume message, and the RRC resume complete message are all sent using SRB1; these SRB1 messages are transmitted before the RRC reconfiguration procedure, and at this time, the remote UE has not yet received the PC5 SRAP configuration, so it is unclear how to transmit these SRB1 messages using SRAP on the PC5 interface.

[0023] In view of at least one of the above-mentioned problems, embodiments of the present invention provide a method, a device, and a communication system for transmitting and receiving information, in which a first terminal device (e.g., a remote UE) establishes a PC5 connection with a second terminal device (e.g., a relay UE), and the first terminal device (remote UE) receives at least one of a radio resource control resume (RRC) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message via the second terminal device (relay UE) according to a default configuration; and / or the first terminal device (e.g., the remote UE) establishes a PC5 connection with the second terminal device (e.g., the relay UE), and at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message received by the first terminal device via the second terminal device includes a sidelink relay adaptation protocol (SRAP) related configuration. This allows the remote UE and the relay UE to adopt accurate settings to send and / or receive relevant RRC messages, thereby preventing message transmission failures due to mismatched settings between the remote UE and the relay UE, and facilitating the remote UE to connect or restore connection with the network device via the relay UE, thereby ensuring the service quality and user experience of the remote UE. [Means for solving the problem]

[0024] According to one aspect of an embodiment of the present invention, an apparatus for transmitting and receiving information is provided, which is applied to a first terminal device (remote UE), and the apparatus includes a first transceiver unit, and the first transceiver unit is configured as follows: Establishing a PC5 connection with a second terminal device (relay UE); and The first transceiver unit receives at least one of a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message via the second terminal device (relay UE) by default.

[0025] According to another aspect of an embodiment of the present invention, an apparatus for transmitting and receiving information is provided, which is applied to a second terminal device (relay UE), and the apparatus includes a second transceiver unit, and the second transceiver unit is configured as follows: The second transceiver unit establishes a PC5 connection with a first terminal device (remote UE); and The second transceiver unit sends at least one of a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message to the first terminal device (remote UE) according to a default setting.

[0026] According to another aspect of an embodiment of the present invention, there is provided an apparatus for transmitting and receiving information, which is applied to a first terminal device (remote UE), and the apparatus includes a third transceiver unit, the third transceiver unit being configured as follows: The third transceiver unit establishes a PC5 connection with a second terminal device (relay UE); and The third transceiver unit receives at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message via the second terminal device (relay UE); At least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0027] According to another aspect of an embodiment of the present invention, there is provided an apparatus for transmitting and receiving information, which is applied to a second terminal device (relay UE), and the apparatus includes a fourth transceiver unit, and the fourth transceiver unit is configured as follows: The fourth transceiver unit establishes a PC5 connection with a first terminal device (remote UE); and The fourth transceiver unit sends at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message to the first terminal device (remote UE); At least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration. [Effects of the Invention]

[0028] The advantageous effects of the embodiment of the present invention are at least as follows: by enabling the remote UE and the relay UE to adopt accurate settings to transmit and / or receive related RRC messages, it is possible to prevent message transmission failures caused by mismatched settings between the remote UE and the relay UE, and it is advantageous for the remote UE to connect or restore connection with the network device via the relay UE, thereby ensuring the service quality and user experience of the remote UE.

[0029] The following description and the accompanying drawings disclose in detail specific embodiments of the present invention and illustrate ways in which the principles of the present invention may be employed. However, the scope of the present invention is not limited thereto. The embodiments of the present invention may include various changes, modifications, and alternatives within the scope of the appended claims.

[0030] Additionally, features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0031] It should be noted that when used in this specification, terms such as "comprise / have" refer to the presence of a feature, element, step, or assembly, but do not exclude the presence or addition of one or more other features, elements, steps, or assemblies. [Brief explanation of the drawings]

[0032] Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals are used to indicate corresponding parts in several drawings and to indicate corresponding parts used in several embodiments. [Figure 1] FIG. 1 illustrates a relay scenario from a terminal device to a network device. [Figure 2] A diagram showing the control plane protocol stack for UE-to-Network relay. [Figure 3] A diagram showing an RRC connection establishment procedure when a remote UE accesses a network device via a relay UE. [Figure 4] 1 is a diagram illustrating a method for transmitting and receiving information in an embodiment of the first aspect. [Figure 5] FIG. 10 is a diagram showing the flow of establishing a UE-to-Network relay connection corresponding to implementation method 1. [Figure 6]FIG. 10A is a diagram showing a flow of an RRC re-establishment procedure, and FIG. 10B is a diagram showing another flow of an RRC re-establishment procedure. [Figure 7] FIG. 10 illustrates an apparatus for transmitting and receiving information in an embodiment of the third aspect. [Figure 8] FIG. 10 illustrates an apparatus for transmitting and receiving information in an embodiment of the fourth aspect. [Figure 9] FIG. 10 illustrates an apparatus for transmitting and receiving information in an embodiment of the fifth aspect. [Figure 10] FIG. 10 illustrates an apparatus for transmitting and receiving information in an embodiment of the sixth aspect. [Figure 11] FIG. 10 illustrates an apparatus for transmitting and receiving information in an embodiment of the seventh aspect. [Figure 12] FIG. 10 is a diagram illustrating an apparatus for transmitting and receiving information in an embodiment of the eighth aspect. [Figure 13] FIG. 13 is a diagram illustrating an apparatus for transmitting and receiving information in an embodiment of the ninth aspect. [Figure 14] FIG. 13 is a diagram illustrating a terminal device in a communication system according to an embodiment of the eighth aspect. [Figure 15] FIG. 10 is a diagram illustrating a network device in a communication system according to an embodiment of the tenth aspect. DETAILED DESCRIPTION OF THE INVENTION

[0033] The foregoing and other features of the present invention will become more apparent from the following detailed description and drawings, which are provided to illustrate, by way of example, the principles of the present invention and are not to be construed as limiting the scope of the invention.

[0034] In embodiments of the present invention, the terms "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0035] Additionally, communications between devices in a communications system may occur according to any level of communications protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, New Radio (NR), and / or other conventional or future-developed communications protocols.

[0036] In the embodiments of the present invention, the term "network device" refers to a device that connects a terminal device to a communication network and provides services to the terminal device, for example, in a communication system. The network device may include, but is not limited to, an IAB-node, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a network gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0037] The base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), a 5G base station (gNB), etc., and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low-power node (e.g., femto, pico, etc.). The term "base station" may include some or all of the functions thereof, and each base station can provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or the area it covers, depending on the context of the term.

[0038] In embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives services from the network, for example, via a network device. A User Equipment may be fixed or mobile, and may also be referred to as a Mobile Station (MS), a terminal, a Subscriber Station (SS), an Access Terminal (AT), a station, etc.

[0039] Among these, user devices may include, but are not limited to, cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, mobile devices, machine-type communication devices, laptop computers, cordless phones, smartphones, smart watches, digital cameras, etc.

[0040] Furthermore, for example, in a scenario such as the Internet of Things (IoT), the user equipment may also be a monitoring or measuring device or apparatus, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0041] Furthermore, the term "network side" or "network device side" refers to the network side, which may be a base station or may include one or more network devices as described above. The term "user side" or "terminal side" or "terminal device side" refers to the user or terminal side, which may be a UE or may include one or more terminal devices as described above.

[0042] In an embodiment of the present invention, the higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, for example, referred to as an RRC message, including, for example, MIB, system information, and dedicated RRC messages, or referred to as an RRC information element (RRC IE). The higher layer signaling may also be, for example, Medium Access Control (MAC) signaling, or referred to as a MAC control element (MAC CE). However, the present invention is not limited thereto.

[0043] In each embodiment of the present invention, the first terminal device may be the remote UE 101 shown in FIG. 1, the second terminal device may be the relay UE 102 shown in FIG. 1, and the network device may be the network device 100 shown in FIG. 1.

[0044] Under the UE-to-Network relay scenario, a first terminal device can communicate with a network device through a second terminal device, that is, the communication path is an indirect path.

[0045] In each embodiment of the present invention, a second terminal device (e.g., a relay UE) sends a message to a first terminal device (e.g., a remote UE), which means that the second terminal device sends a message generated by itself to the first terminal device, or the second terminal device forwards a message received from a network device to the first terminal device, where the second terminal device does not analyze the message, or the second terminal device does not analyze the message using the protocol layer corresponding to the message, or the second terminal device transmits the message transparently, etc. For example, a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message, a radio resource control reconfiguration (RRC reconfiguration) message, etc. are forwarded by the second terminal device to the first terminal device.

[0046] Similarly, the second terminal device (e.g., a relay UE) sends a message to a network device (e.g., a gNB), which means that the second terminal device sends a message generated by itself to the network device, or the second terminal device forwards a message received from the first terminal device to the network device, where the second terminal device does not analyze the message, or the second terminal device does not analyze the message using the protocol layer corresponding to the message, or the second terminal device transmits the message transparently, etc. For example, a radio resource control re-establishment complete message, a radio resource control reconfiguration complete message, etc. are forwarded by the second terminal device to the network device.

[0047] <Example of the first aspect> In an embodiment of a first aspect of the present invention, a method for transmitting and receiving information is provided.

[0048] 4 is a diagram illustrating a method for transmitting and receiving information in an embodiment of the first aspect. As shown in FIG. 4, the method for transmitting and receiving information includes the following operations (steps):

[0049] Operation 401: A first terminal device establishes a PC5 connection with a second terminal device; Operation 402: The first terminal device receives at least one of a radio resource control resume (RRC) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message via the second terminal device with default settings, and / or at least one of the radio resource control setup (RRC setup) message, the radio resource control resume (RRC resume) message, and the radio resource control re-establishment (RRC re-establishment) message received by the first terminal device via the second terminal device includes related settings of a sidelink relay adaptation protocol (SRAP).

[0050] In operation 402, the default configuration may include, for example, a default sidelink radio link control bearer configuration and / or a default SRAP related configuration, and the default configuration may be a predefined or pre-defined configuration.

[0051] In some embodiments, the default sidelink radio link control bearer configuration may be a default configuration used by the sidelink RLC bearer (or sidelink RLC channel) for transmitting SRB0 messages of the first terminal device, and the sidelink RLC bearer using this default configuration is referred to as SL-RLC0, and the default configuration is referred to as the default configuration of SL-RLC0.

[0052] In some embodiments, the default settings for SL-RLC0 may include at least one of the following: RLC mode (e.g., transparent mode TM or acknowledged mode AM), serial number length (sn-field Length, e.g., value 12), reassembly timer (t-Reassembly), logical channel identification (ID) (e.g., value 4), priority (e.g., value 1), preferred bit rate (e.g., value infinity), and logical channel group (e.g., value 0).

[0053] In some other embodiments, the default sidelink radio link control bearer configuration may be a default configuration used by a sidelink RLC bearer (or sidelink RLC channel) for transmitting a specific SRB1 message of the first terminal device, where the specific SRB1 message may include at least one of an RRC resume, an RRC re-establishment, and an RRC reconfiguration message, and the sidelink RLC bearer using the default configuration is referred to as SL-RLC1, and the default configuration is referred to as the default configuration of SL-RLC1.

[0054] In some embodiments, the default settings of SL-RLC1 may include at least one of the following: RLC mode (e.g., acknowledged mode AM), RLC serial number length (sn-field Length, e.g., value 12), reassembly timer (t-Reassembly), logical channel indicator (e.g., value 4), priority (e.g., value 1), prioritized bit rate (e.g., value infinity), and logical channel group (e.g., value 0).

[0055] In some embodiments, the associated configuration of the default SRAP may include at least one of the following: a local / temporary identifier of the first terminal device (remote UE), an additional mapping list, and a deletion mapping list, where the additional mapping list may include at least one of the following: a radio bearer identity (RB-Identity) of the remote UE and PC5 RLC channel configuration information (or sidelink RLC bearer configuration information) corresponding to the radio bearer.

[0056] In some embodiments, the associated settings of the default SRAP include a default SRAP setting for SRB0 and / or a default SRAP setting for SRB1.

[0057] In some embodiments, for a default SRAP configuration of SRB0, the value of the RB-Identity of the remote UE may be 0 or SRB0, and the PC5 RLC channel configuration information (or sidelink RLC bearer configuration information) may be a sidelink RLC bearer configuration index, e.g., a value of 0, which may correspond to a sidelink RLC configuration and / or a sidelink MAC logical channel configuration. The sidelink RLC configuration includes an RLC mode (e.g., TM or AM) and its corresponding parameters. For example, when the RLC mode is AM, the corresponding parameters may include at least one of the following: a sidelink serial number length (e.g., a value of 12), a polling retransmission time (sl-T-PollRetransmit), a polling PDU (sl-PollPDU), a polling byte (sl-PollByte), a maximum retransmission threshold, etc. The sidelink MAC logical channel configuration may include at least one of the following: a priority (e.g., 1), a priority bit, etc. The mapping list for deletion may include a rate (e.g., infinite), a length of the token bucket size (e.g., infinite), whether to allow grants of type 1 configuration (e.g., not allow), whether to enable HARQ feedback (e.g., the value is enabled), a list of allowed subcarrier spacings (e.g., all subcarrier spacings are allowed), a maximum PUSCH duration (e.g., a value of 0.25 ms, 0.5 ms, etc.), a logical channel group (e.g., a value of 0), a scheduling request indicator (e.g., a value of 0), whether to apply a sidelink logical channel SR delay timer (e.g., not to apply the SR delay timer), etc. The above-mentioned deletion mapping list may also include a radio bearer identity (RB-Identity) of the remote UE, e.g., a value of 0 or SRB0.

[0058] In some embodiments, for a default SRAP configuration of SRB1, the value of the RB-Identity of the remote UE may be 1 or SRB1, and the PC5 RLC channel configuration information (or sidelink RLC bearer configuration information) may be a sidelink RLC bearer configuration index, which may be an integer between 1 and 512, e.g., 1 by default. The sidelink RLC bearer configuration index may correspond to a sidelink RLC configuration and / or a sidelink MAC logical channel configuration. The sidelink RLC configuration may include an RLC mode AM and its corresponding parameters, which may include at least one of the following: a sidelink serial number length (e.g., a value of 12), a polling retransmission time (sl-T-PollRetransmit), a polling PDU (sl-PollPDU), a polling byte (sl-PollByte), a maximum retransmission threshold, etc. The sidelink MAC logical channel configuration may include at least one of the following: priority (e.g., 1), prioritized bit rate (e.g., infinity), token size (e.g., 0), and token size (e.g., 1). The mapping list for deletion may include the length of the size of the subcarrier bucket (e.g., infinite), whether to allow grants of type 1 configuration (e.g., not allow), whether to enable HARQ feedback (e.g., the value is enabled), a list of allowed subcarrier spacings (e.g., all subcarrier spacings are allowed), the maximum PUSCH duration (e.g., the value is 0.25 ms, 0.5 ms, etc.), a logical channel group (e.g., the value is 0), a scheduling request indicator (e.g., the value is 0), whether to apply the sidelink logical channel SR delay timer (e.g., not apply the SR delay timer), etc. The above-mentioned mapping list for deletion may also include the radio bearer identity (RB-Identity) of the remote UE, e.g., the value is 1 or SRB1.

[0059] For example, when the first terminal device sends a radio resource control re-establishment request (RRC re-establishment request) message or a radio resource control resume request (RRC resume request) message, or when the first terminal device initiates a radio resource control re-establishment procedure or a radio resource control resume procedure, it may use the default SRAP associated settings of SRB1 and / or the default settings of SL-RLC1 for SRB1.

[0060] According to an embodiment of the first aspect, during an RRC connection establishment procedure, a re-establishment procedure, or a resume procedure, a first terminal device (e.g., a remote UE) and a second terminal device (e.g., a relay UE) can adopt accurate settings on the PC5 interface to send and / or receive related RRC messages, thereby preventing message transmission failures due to mismatched settings between the remote UE and the relay UE, and favoring the remote UE re-establishing or restoring a connection with a network device via the relay UE, thereby ensuring the service quality and user experience of the remote UE.

[0061] The operation 402 will be described below together with a specific implementation method.

[0062] (Implementation Method 1) In implementation mode 1, the RRC setup message (for example, the message is transmitted using SRB0) includes the relevant configuration of SRAP, which is as follows:

[0063] The SRAP-related configuration includes the SRAP-related configuration for SRB1. For example, the SRAP-related configuration for SRB1 may include at least one of the following: a local / temporary identifier of the first terminal device (remote UE) and an additional mapping list. The additional mapping list may include at least one of the following: a radio bearer identity (RB-Identity) of the remote UE and PC5 RLC channel configuration information (or sidelink RLC bearer configuration information) corresponding to the radio bearer. For example, the RB-Identity of the remote UE may be 1 or SRB1, and the PC5 RLC channel configuration information (or sidelink RLC bearer configuration information) may be a sidelink RLC bearer configuration index, which may correspond to a sidelink RLC configuration and / or a sidelink MAC logical channel configuration. Wherein, the sidelink RLC configuration includes RLC mode AM and its corresponding parameters, which may include at least one of sidelink serial number length, polling retransmission time, polling PDU, polling byte, max retransmission threshold, etc.; and the sidelink MAC logical channel configuration may include at least one of the following, namely priority, prioritized bit rate, token bucket size length, whether to allow Type 1 configuration grant, whether to enable HARQ feedback, allowed subcarrier spacing list, max PUSCH duration, logical channel group, scheduling request indicator, whether to apply sidelink logical channel SR delay timer, etc.

[0064] - The RRC setup request message (sent by the remote UE to the gNB via the relay UE) and the RRC setup message (sent by the gNB to the remote UE via the relay UE) are transmitted using the default setting of SL-RLC0 on the PC5 interface.

[0065] After receiving the SRAP-related configuration in the RRC setup message, the remote UE may perform at least one of the following operations: establish an SRAP entity, configure the parameters of the SRAP entity based on the SRAP-related configuration, apply the UE indicator (e.g., UE-IdentityRemote) in the RRC setup message as the Cell Radio Network Temporary Identifier (C-RNTI) of the remote UE, and send a Radio Resource Control Establishment Complete (RRC setup complete) message based on the SRAP-related configuration (e.g., using the parameters of the configured SRAP entity).

[0066] Figure 5 is a diagram illustrating a UE-to-Network relay connection establishment flow corresponding to implementation mode 1. As shown in Figure 5, the flow includes the following operations (steps):

[0067] Operation 1: The Remote UE discovers the Relay UE, and a PC5 connection is established between them.

[0068] Operation 2: The remote UE sends an RRC setup request message to the relay UE.

[0069] Operation 3a to Operation 3b: The Relay UE reports the L2 ID of the remote UE to the gNB through a Sidelink User Equipment Information (SUI) message, and the gNB sends an RRC reconfiguration message to the relay UE, in which the SRAP settings of the relay UE are configured, which may include the SRAP settings of the Uu interface, the SRAP settings of the PC5 interface, etc.

[0070] Operation 4: The relay UE forwards the RRC setup request sent by the remote UE in operation 2 to the gNB.

[0071] Operation 5: The gNB sends an RRC setup message to the relay UE, where the RRC setup message includes the associated configuration of the SRAP for the remote UE.

[0072] Operation 6: The relay UE forwards an RRC setup message to the remote UE.

[0073] Operation 7: The remote UE performs an operation corresponding to the SRAP-related settings, such as establishing an SRAP entity; and / or configuring parameters of the SRAP entity based on the SRAP-related settings; and / or applying the UE indicator (e.g., UE-IdentityRemote) in the RRC setup message as the Cell Radio Network Temporary Identifier (C-RNTI) of the remote UE.

[0074] Operation 8: The Remote UE sends a radio resource control setup complete (RRC setup complete) message based on the associated configuration of the SRAP (for example, using the parameters of the configured SRAP entity).

[0075] Operation 9: The Relay UE forwards the RRC setup complete message sent by the Remote UE to the gNB.

[0076] (Implementation Method 2) In implementation manner 2, the default configuration in operation 402 may be, for example, a default SRAP configuration of SRB1 and / or a default configuration of SL-RLC1. For an RRC resume message and / or an RRC re-establishment message, since these two messages are transmitted using SRB1, when the relay UE receives the message from the gNB, it sends the message to the remote UE using the associated configuration of the default SRAP and / or the default configuration of SL-RLC1 over the PC5 interface.

[0077] In one embodiment of implementation mode 2, the network device has already configured the relay UE with an SRAP configuration of the Uu interface and an SRAP configuration of the PC5 interface. When the relay UE receives an SRB1 message over the Uu interface that the gNB sends to the remote UE via the relay UE, the relay UE needs to determine whether to send the SRB1 message to the remote UE over the PC5 interface using the default configuration, or to send the SRB1 message to the remote UE using the SRAP configuration of the PC5 interface configured by the network device. For example, if the SRB1 message received by the relay UE is the first SRB1 message received after the remote UE sends an SRB0 message to the gNB, or if the relay UE receives an SRB1 bearer RRC resume message or RRC re-establishment message, the relay UE sends the message to the remote UE over the PC5 interface using the default configuration; otherwise, the relay UE sends the message to the remote UE over the PC5 interface using the SRAP configuration of the PC5 interface configured by the network device.

[0078] In implementation method 2, when the remote UE sends an RRC re-establishment request message or an RRC resume request message (these two messages are sent on SRB0), it uses the default SRAP related configuration and / or the default SL-RLC1 configuration for SRB1, thereby receiving the RRC resume message or RRC re-establishment message sent by the gNB using SRB1.

[0079] Figure 6a shows a flow diagram of an RRC re-establishment procedure. Figure 6b shows another flow diagram of an RRC re-establishment procedure. The RRC resume procedure is similar to the RRC re-establishment procedure, that is, the remote UE sends an RRC resume request via the relay UE, receives an RRC resume message sent by the gNB via the relay UE, and sends an RRC resume complete message to the gNB via the relay UE.

[0080] Corresponding to Figure 6a described below, in one embodiment of implementation mode 2, the RRC resume complete message and / or the RRC re-establishment complete message sent by the remote UE to the relay UE may adopt default SRAP-related settings and / or default SL-RLC1 settings.

[0081] In another embodiment of implementation mode 2, which corresponds to b in Figure 6 described below, the RRC resume message and / or RRC re-establishment message may include SRAP-related configuration of the remote UE, and the remote UE may use the SRAP-related configuration to send an RRC resume complete message and / or RRC re-establishment complete message. The SRAP-related configuration can be described in implementation mode 1.

[0082] The RRC re-establishment procedures shown in Fig. 6a and Fig. 6b will be described below.

[0083] The flow shown in FIG. 6a includes the following operations:

[0084] Operation 1: The Remote UE and the Relay UE perform a discovery procedure and establish a PC5-RRC connection using the NR V2X procedure.

[0085] Operation 2: The remote UE adopts the default configuration of SL-RLC0 and sends an RRC re-establishment request message to the relay UE (transmitted using SRB0). For SRB1, the remote UE uses the default SRAP-related configuration (e.g., the default SRAP configuration of SRB1) and / or the default configuration of SL-RLC1.

[0086] Steps 3 and 4: The Relay UE reports the L2 ID of the remote UE to the gNB via a Sidelink UE Information (SUI) message, and the gNB sends an RRC reconfiguration message to the relay UE, in which the SRAP settings of the relay UE are configured, which may include the SRAP settings of the Uu interface and the SRAP settings of the PC5 interface.

[0087] Operation 5: The Relay UE forwards the RRC re-establishment request message of the remote UE to the gNB using the Uu SRAP configuration.

[0088] Operation 6: The gNB sends an RRC re-establishment message to the remote UE via the relay UE. The Relay UE can determine that the received message is an SRB1 message of the remote UE based on the information in the Uu SRAP header.

[0089] Operation 7: The Relay UE sends the SRB1 message to the remote UE via the PC5 interface using the associated configuration of the default SRAP and / or the default configuration of the SL-RLC1.

[0090] Operation 8: The remote UE sends an RRC re-establishment complete message to the relay UE using the default SRAP related configuration and / or the default configuration of SL-RLC1.

[0091] Operation 9: The Relay UE forwards the RRC re-establishment complete message to the gNB.

[0092] Operation 10: The gNB sends an RRC reconfiguration message to the remote UE via the relay UE, where the RRC reconfiguration message may include an SRAP-related configuration of the remote UE, and the RRC reconfiguration message may be sent using a default SRAP-related configuration and / or a default SL-RLC1 configuration.

[0093] Operation 11: The remote UE applies the relevant configuration of the SRAP of the remote UE included in the RRC reconfiguration message.

[0094] Operation 12: The Remote UE sends an RRC reconfiguration complete message to the gNB via the relay UE.

[0095] The flow shown in FIG. 6b includes the following operations:

[0096] Steps 1 to 5 are the same as steps 1 to 5 in the flow shown in FIG. 6a.

[0097] Operation 6: The gNB sends an RRC re-establishment message to the remote UE via the relay UE, which includes the relevant configuration of the SRAP of the remote UE. Based on the information in the Uu SRAP header, the Relay UE can determine that the received message is the SRB1 message of the remote UE.

[0098] Operation 7: The Relay UE sends the received SRB1 message of the remote UE to the remote UE through the PC5 interface using the default SRAP related configuration and / or the default configuration of SL-RLC1.

[0099] Operation 8: The Remote UE performs corresponding operations according to the SRAP related configuration carried in the RRC re-establishment message, such as establishing an SRAP entity and performing the SRAP related configuration.

[0100] Operation 9a: The Remote UE sends an RRC re-establishment complete message on the PC5 interface with the associated configuration of the SRAP.

[0101] Operation 9b: The RRC re-establishment complete message is forwarded by the relay UE to the gNB via the Uu interface.

[0102] (Implementation Method 3) In implementation manner 3, the default configuration in operation 402 may be, for example, a default SRAP configuration of SRB0 and / or a default configuration of SL-RLC0. For example, the relay UE sends an RRC resume message and / or an RRC re-establishment message to the remote UE via the PC5 interface using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0.

[0103] The RRC re-establishment procedure corresponding to implementation mode 3 is similar to that shown in Figures 6a and 6b, with the following differences:

[0104] In operation 7, the Relay UE does not use SRAP on the PC5 interface (or SRAP does not appear, etc.) and sends an RRC re-establishment message or an RRC resume message using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0. Correspondingly, the Remote UE does not use SRAP to receive the RRC re-establishment message or the RRC resume message, but receives it using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0.

[0105] If the RRC re-establishment message or the RRC resume message does not include SRAP configuration (similar to a in Fig. 6), in operation 8, the remote UE sends an RRC re-establishment complete message or an RRC resume complete message to the relay UE using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0. In operation 10, the relay UE may send an RRC reconfiguration message to the remote UE using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0.

[0106] - If the RRC re-establishment message or the RRC resume message includes an SRAP configuration (similar to b in Figure 6), in operation 8, the remote UE applies the relevant configuration of the SRAP, and in operation 9, the remote UE sends an RRC re-establishment complete message or an RRC resume complete message to the relay UE based on the corresponding SRAP configuration.

[0107] According to an embodiment of the first aspect, during an RRC connection establishment procedure, a re-establishment procedure, or a resume procedure, a first terminal device (e.g., a remote UE) and a second terminal device (e.g., a relay UE) can adopt accurate settings to send and / or receive related RRC messages, thereby preventing message transmission failures due to mismatched settings between the remote UE and the relay UE, and advantageously allowing the remote UE to connect or restore connection with a network device via the relay UE, thereby ensuring the service quality and user experience of the remote UE.

[0108] <Example of the second aspect> In accordance with an embodiment of a second aspect of the present invention, a method for transmitting and receiving information is provided.

[0109] In at least one embodiment, the method for transmitting and receiving information may include operating a Relay Adaptation Protocol (SRAP) entity in the remote UE.

[0110] The operation on the SRAP entity of the remote UE may include establishing, configuring, reconfiguring, modifying, or releasing the SRAP entity, and the SRAP may include a PC5 SRAP or a Sidelink Relay Adaptation Protocol (SL SRAP).

[0111] For example, the establishment of an SRAP (eg, PC5 SRAP or SL SRAP) entity by the remote UE may be performed by at least one of the following processes.

[0112] A first terminal device (remote UE) selects or reselects a second terminal device (relay UE); A first terminal device (remote UE) initiates an RRC connection establishment procedure and / or an RRC re-establishment procedure and / or an RRC resume procedure via a second terminal device (relay UE); A first terminal device (remote UE) sends an RRC setup request and / or an RRC re-establishment request and / or an RRC resume request via a second terminal device (relay UE); A first terminal device (remote UE) receives an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message via a second terminal device (relay UE); and The first terminal device (remote UE) receives an RRC reconfiguration message from the gNB indicating that the path is switched to the second terminal device (relay UE) (direct-to-indirect path switch).

[0113] Also, for example, the remote UE may configure, reconfigure, or change the entity of an SRAP (PC5 SRAP or SL SRAP) through at least one of the following processes.

[0114] The first terminal device (remote UE) uses the default SRAP related settings; and A first terminal device (remote UE) receives SRAP-related configurations included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message.

[0115] Furthermore, for example, the release of an SRAP (PC5 SRAP or SL SRAP) entity by a remote UE may be performed by at least one of the following processes.

[0116] The first terminal device (remote UE) switches from communicating with the gNB via a relay to communicating directly with the gNB (indirect-to-direct path switch); A PC5 connection (e.g., a PC5-RRC connection or a PC5 unicast link) between a first terminal device (remote UE) and a second terminal device (relay UE) is released; and A first terminal device (remote UE) enters a radio resource control idle (RRC_Idle) or radio resource control inactive (RRC_Inactive) state.

[0117] In at least another embodiment, the method for transmitting and receiving information may include operating a Relay Adaptation Protocol (SRAP) entity by the relay UE, where operating the SRAP entity by the relay UE may include establishing, configuring, reconfiguring, modifying, or releasing the SRAP entity. The SRAP may include a PC5 SRAP, a Uu SRAP, or a SL SRAP.

[0118] For example, the establishment of an SRAP (PC5 SRAP or SL SRAP) entity by the relay UE may be performed by at least one of the following processes.

[0119] be authorized and / or authenticated as a second terminal device (relay UE); Establish a PC5 connection with a first terminal device (remote UE) (for example, establish a PC5 connection with a first first terminal device (remote UE)); receiving an RRC setup request and / or an RRC re-establishment request and / or an RRC resume request transmitted by a first terminal device (remote UE); and Receive the relevant configuration of the SRAP of the SL included in the RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB.

[0120] Also, for example, the establishment, re-establishment or change of the PC5 SRAP or SL SRAP entity by the relay UE may be performed under the following conditions: Receive the relevant configuration of the SRAP of the SL included in the RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB.

[0121] Also, for example, the release of a PC5 SRAP or SL SRAP entity by a relay UE may be performed by at least one of the following processes.

[0122] A first terminal device (remote UE) switches from communicating with a network device via the second terminal device to communicating directly with the network device (indirect-to-direct path switch); A PC5 connection (e.g., a PC5-RRC connection or a PC5 unicast link) between a first terminal device (remote UE) and a second terminal device (relay UE) is released; and There is no PC5 connection between the first terminal device (remote UE) and the second terminal device (relay UE).

[0123] Also, for example, the establishment of a Uu SRAP entity by the relay UE may be performed by at least one of the following processes.

[0124] be authorized and / or authenticated as a second terminal device (relay UE); Establish a PC5 connection with a first terminal device (remote UE), for example, establish a PC5 connection with a first first terminal device (remote UE); and Receive the relevant configuration of the SRAP of the Uu included in the RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message sent by the gNB.

[0125] Also, for example, the establishment, re-establishment or change of the Uu SRAP entity by the relay UE may be performed under the following conditions: Receive the relevant configuration of the SRAP of the SL included in the RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB.

[0126] Also, for example, the release of the Uu SRAP entity by the relay UE may be performed under the following conditions: The second terminal device (relay UE) no longer has a PC5 connection with one first terminal device (remote UE).

[0127] According to an embodiment of the second aspect of the present invention, the associated operation of the PC5 SRAP entity and / or the SL SRAP entity by the remote UE and the relay UE is defined, which is advantageous for the remote UE and the relay UE to accurately use the SRAP capabilities and settings for message transmission, and can ensure that the network device accurately identifies the remote UE and its radio bearer.

[0128] <Example of the third aspect> In an embodiment of the third aspect, an information transmitting and receiving device is provided, which is applied to a first terminal device, for example, remote UE 101 in Fig. 1. The function of the information transmitting and receiving device corresponds to the operation of the first terminal device in the method of transmitting and receiving information in the embodiment of the first aspect.

[0129] 7 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the third aspect. As shown in FIG. 7, the information transmitting and receiving device 700 includes a first transceiver unit 701. The first transceiver unit 701 is configured as follows:

[0130] Establishing a PC5 connection with a second terminal device (relay UE); and The first transceiver unit receives at least one of a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message via the second terminal device (relay UE) by default.

[0131] In at least one embodiment, the default configuration includes a default sidelink radio link control bearer configuration and / or a default sidelink relay adaptation protocol (SRAP) related configuration.

[0132] Wherein, the default sidelink radio link control bearer configuration is the default configuration of sidelink radio link control 0 (SL-RLC0) or the default configuration of sidelink radio link control 1 (SL-RLC1).

[0133] The associated settings of the default SRAP include at least one of the following: a local or temporary identifier of the first terminal device (remote UE), a mapping list to be added, and a mapping list to be deleted.

[0134] The associated configuration of the default SRAP includes a default SRAP configuration for signaling radio bearer 0 (SRB0) and / or a default SRAP configuration for signaling radio bearer 1 (SRB1).

[0135] In at least one embodiment, the first transceiver unit 701 receives a signaling radio bearer 1 (SRB1) message using a sidelink radio link control bearer establishment 1 (SL-RLC1) on a PC5 interface between a first terminal device (remote UE) and a second terminal device (relay UE), the SRB1 message carrying the radio resource control resume (RRC) message and / or the radio resource control re-establishment (RRC re-establishment) message, or the SRB1 message is the first SRB1 message received by the first terminal device (remote UE) after the signaling radio bearer 0 (SRB0) message of the first terminal device (remote UE) is sent to a network device.

[0136] In at least one embodiment, the first transceiver unit 701 is further configured as follows.

[0137] When the first terminal device (remote UE) sends a radio resource control re-establishment request (RRC re-establishment request) message or a radio resource control resume (RRC resume request) message, or when the first terminal device (remote UE) initiates a radio resource control re-establishment procedure or a radio resource control resume procedure, the first transceiver unit uses the default SRA configuration of SRB1 and / or the default configuration of SL-RLC1 for SRB1.

[0138] For example, the RRC resume message or the RRC re-establishment message does not include a Sidelink Relay Adaptation Protocol (SRAP)-related configuration, whereby the first transceiver unit 701 sends the RRC resume complete message and / or the RRC re-establishment complete message via the PC5 interface between the first terminal device (remote UE) and the second terminal device (relay UE) using the default SRAP configuration of SRB1 and / or the default configuration of SL-RLC1.

[0139] For example, the RRC resume message or the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration, and the first transceiver unit 701 uses the SRAP related configuration to send the RRC resume complete message and / or the RRC re-establishment complete message.

[0140] In at least another embodiment, a first transceiver unit receives the radio resource control resume (RRC resume) message and / or the radio resource control re-establishment (RRC re-establishment) message using a default SRAP configuration of SRB0 and / or a sidelink radio link control bearer configuration 0 (SL-RLC0) on a PC5 interface of the first terminal device (remote UE) and the second terminal device (relay UE).

[0141] In one example, the radio resource control resume (RRC resume) message or the radio resource control re-establishment (RRC re-establishment) message does not include any configuration related to a sidelink relay adaptation protocol (SRAP).

[0142] Wherein, the first transceiver unit 701 sends a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message via the PC5 interface between the first terminal device (remote UE) and the second terminal device (relay UE) using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0.

[0143] Among them, the first transceiver unit 701 is further configured as follows: receive a radio resource control reconfiguration (RRC reconfiguration) message using the default SRAP configuration of the SRB0 and / or the default configuration of the SL-RLC0 on the PC5 interface of the first terminal device (remote UE) and the second terminal device (relay UE).

[0144] In another example, the Radio Resource Control resume (RRC) message or the Radio Resource Control re-establishment (RRC re-establishment) message includes related configuration of a Sidelink Relay Adaptation Protocol (SRAP).

[0145] Wherein, the first transceiver unit 701 applies the relevant configuration of the SRAP, and sends a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message on the PC5 interface between the first terminal device (remote UE) and the second terminal device (relay UE).

[0146] <Example of the fourth aspect> In an embodiment of the fourth aspect, an information transmitting and receiving device is provided, which is applied to a second terminal device, for example, the relay UE 102 in Fig. 1. The function of the information transmitting and receiving device corresponds to the method of the relay UE in the embodiment of the first aspect.

[0147] 8 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the fourth aspect. As shown in FIG. 8, the information transmitting and receiving device 800 includes a second transceiver unit 801. The second transceiver unit 801 is configured as follows:

[0148] The second transceiver unit 801 establishes a PC5 connection with a first terminal device (remote UE); and The second transceiver unit 801 sends at least one of a radio resource control resume (RRC) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message to the first terminal device (remote UE) according to a default setting. For example, the second transceiver unit 801 forwards the radio resource control resume (RRC) message, the radio resource control re-establishment (RRC re-establishment) message, and the radio resource control reconfiguration (RRC reconfiguration) message sent by the network device to the first terminal device.

[0149] In at least one embodiment, the default configuration includes a default sidelink radio link control bearer configuration and / or a default sidelink relay adaptation protocol (SRAP) related configuration.

[0150] Wherein, the default sidelink radio link control bearer configuration is the default configuration of sidelink radio link control 0 (SL-RLC0) or the default configuration of sidelink radio link control 1 (SL-RLC1).

[0151] The associated settings of the default SRAP include at least one of the following: a local or temporary identifier of the first terminal device (remote UE), an add mapping list, and a delete mapping list.

[0152] The associated configuration of the default SRAP is the default SRAP configuration of signaling radio bearer 0 (SRB0) and / or the default SRAP configuration of signaling radio bearer 1 (SRB1).

[0153] In at least one embodiment, the second transceiver unit 801 transmits a signaling radio bearer 1 (SRB1) message using a sidelink radio link control bearer establishment 1 (SL-RLC1) on the PC5 interface between a second terminal device (relay UE) and a first terminal device (remote UE), where the SRB1 message carries a radio resource control resume (RRC resume) message and / or a radio resource control re-establishment (RRC re-establishment) message, or the SRB1 message is the first SRB1 message sent by the second terminal device (relay UE) to the first terminal device after the first terminal device (remote UE) sends a signaling radio bearer 0 (SRB0) message to a network device.

[0154] In one example, the Radio Resource Control resume (RRC) message or the Radio Resource Control re-establishment (RRC re-establishment) message does not include a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0155] For example, the second transceiver unit 801 receives a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message sent by the first terminal device using the default SRAP setting of SRB1 and / or the default setting of SL-RLC1 on the PC5 interface of the second terminal device (relay UE) and the first terminal device (remote UE).

[0156] In another example, the RRC resume message or the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration, and the second transceiver unit 801 can receive the RRC resume complete message and / or the RRC re-establishment complete message sent by the first terminal device according to the SRAP related configuration.

[0157] In at least some other embodiments, the second transceiver unit 801 transmits the radio resource control resume (RRC resume) message and / or the radio resource control re-establishment (RRC re-establishment) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on the PC5 interface of the second terminal device (relay UE) and the first terminal device (remote UE).

[0158] In one example, the Radio Resource Control resume (RRC) message or the Radio Resource Control re-establishment (RRC re-establishment) message does not include a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0159] Wherein, the second transceiver unit 801 receives a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message via the PC5 interface of the second terminal device (relay UE) and the first terminal device (remote UE) using the default SRAP configuration of SRB0 and / or the default configuration of SL-RLC0.

[0160] The second transceiver unit is further configured to: transmit a radio resource control reconfiguration (RRC reconfiguration) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on the PC5 interface between the second terminal device (relay UE) and the first terminal device (remote UE).

[0161] In another example, the Radio Resource Control resume (RRC) message or the Radio Resource Control re-establishment (RRC re-establishment) message includes related configuration of a Sidelink Relay Adaptation Protocol (SRAP).

[0162] Wherein, the second transceiver unit 801 receives a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message via the PC5 interface between the second terminal device (relay UE) and the first terminal device (remote UE).

[0163] <Example of the fifth aspect> In an embodiment of the fifth aspect, an information transmitting and receiving device is provided, which is applied to a first terminal device, for example, the remote UE 101 in Fig. 1. The function of the information transmitting and receiving device corresponds to the method of the remote UE in the embodiment of the first aspect.

[0164] 9 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the fifth aspect. As shown in FIG. 9, the information transmitting and receiving device 900 includes a third transceiver unit 901. The third transceiver unit 901 is configured as follows:

[0165] The third transceiver unit 901 establishes a PC5 connection with a second terminal device (relay UE); and The third transceiver unit 901 receives at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message via the second terminal device (relay UE), and at least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes related configuration of a sidelink relay adaptation protocol (SRAP).

[0166] Wherein, after receiving the SRAP related configuration in the RRC setup message, the third transceiver unit 801 causes the first terminal device (remote UE) to perform at least one of the following operations: Establishing the SRAP entity; Set the parameters of the SRAP entity according to the relevant settings of the SRAP; Applying the terminal device indicator in the RRC setup message as a Cell Radio Network Temporary Identifier (C-RNTI) of the first terminal device (remote UE); and Send a radio resource control setup complete (RRC setup complete) message based on the relevant configuration of the SRAP.

[0167] In addition, the third transceiver unit 901 may further have the functions of the first transceiver unit 701, that is, the functions of the first transceiver unit 701 may be integrated into the third transceiver unit 901, so that the third transceiver unit 901 also has the functions of the first transceiver unit 701.

[0168] <Example of the sixth aspect> In an embodiment of the sixth aspect, an information transmitting and receiving device is provided, which is applied to a second terminal device, for example, the relay UE 102 in Fig. 1. The function of the information transmitting and receiving device corresponds to the method of the second terminal device in the embodiment of the first aspect.

[0169] 10 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the sixth aspect. As shown in FIG. 10, the information transmitting and receiving device 1000 includes a fourth transceiver unit 1001. The fourth transceiver unit 1001 is configured as follows:

[0170] The fourth transceiver unit 1001 establishes a PC5 connection with the first terminal device (remote UE); and The fourth transceiver unit 1001 sends at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message to a first terminal device (remote UE), where at least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes related configuration of a sidelink relay adaptation protocol (SRAP).

[0171] Wherein, the fourth transceiver unit 1001 transmits a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message and a radio resource control reconfiguration (RRC reconfiguration) message sent by the network device to the first terminal device.

[0172] The fourth transceiver unit 1001 is further configured to: receive a radio resource control setup complete (RRC setup complete) message from the first terminal device according to the associated configuration of an SRAP.

[0173] In addition, the fourth transceiver unit 1001 may further have the functions of the second transceiver unit 801, that is, the functions of the second transceiver unit 801 may be integrated into the fourth transceiver unit 1001, so that the fourth transceiver unit 1001 also has the functions of the second transceiver unit 801.

[0174] <Example of the seventh aspect> In an embodiment of the seventh aspect, an apparatus for transmitting and receiving information is provided, which is applied to a network device, such as the network device 100 in Fig. 1. The function of the apparatus for transmitting and receiving information corresponds to the method of the network device in the embodiment of the first aspect.

[0175] 11 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the seventh aspect. As shown in FIG. 11, the information transmitting and receiving device 1100 includes a fifth transceiver unit 1101, which is configured as follows:

[0176] Send at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message for the first terminal device (remote UE) to a second terminal device (relay UE), in which at least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes related configuration of a sidelink relay adaptation protocol (SRAP).

[0177] <Example of the eighth aspect> In an embodiment of the eighth aspect, an information transmitting and receiving device is provided, which is applied to a first terminal device, for example, the remote UE 101 in Fig. 1. The function of the information transmitting and receiving device corresponds to the method of the remote UE in the embodiment of the second aspect.

[0178] 12 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the eighth aspect. As shown in FIG. 12, the information transmitting and receiving device 1200 includes a sixth transceiver unit 1201. The sixth transceiver unit 1201 is configured as follows:

[0179] Establishing a Relay Adaptation Protocol (SRAP) entity (PC5 SRAP or SL SRAP) through at least one of the following processes: A first terminal device (remote UE) selects or reselects a second terminal device (relay UE); A first terminal device (remote UE) initiates an RRC connection establishment procedure and / or an RRC re-establishment procedure and / or an RRC resume procedure via a second terminal device (relay UE); A first terminal device (remote UE) sends an RRC setup request and / or an RRC re-establishment request and / or an RRC resume request via a second terminal device (relay UE); A first terminal device (remote UE) receives an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message via a second terminal device (relay UE); and A first terminal device (remote UE) receives an RRC reconfiguration message from the gNB, in which the path is switched to a second terminal device (relay UE) (direct-to-indirect path switch); and / or configuring, reconfiguring or modifying a SRAP (PC5 SRAP or SL SRAP) entity by at least one of the following processes: The first terminal device (remote UE) uses the default SRAP related settings; and A first terminal device (remote UE) receives an SRAP-related configuration included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message; and / or release of SRAP (PC5 SRAP or SL SRAP) entities through at least one of the following processes: The first terminal device (remote UE) switches from communicating with the gNB via a relay to communicating directly with the gNB (indirect-to-direct path switch); A PC5 connection (e.g., a PC5-RRC connection or a PC5 unicast link) between a first terminal device (remote UE) and a second terminal device (relay UE) is released; and A first terminal device (remote UE) enters a radio resource control idle (RRC_Idle) or radio resource control inactive (RRC_Inactive) state.

[0180] <Example of the ninth aspect> In a ninth embodiment of the present invention, an information transmitting and receiving device is provided, which is applied to a second terminal device, for example, the relay UE 102 in FIG. 1. The function of the information transmitting and receiving device corresponds to the method of the relay UE in the second embodiment of the present invention.

[0181] 13 is a diagram illustrating an information transmitting and receiving device according to an embodiment of the ninth aspect. As shown in FIG. 13, the information transmitting and receiving device 1300 includes a seventh transceiver unit 1301, which is configured as follows:

[0182] Establishment of a SRAP (PC5 SRAP or SL SRAP) entity through at least one of the following processes: be authorized and / or authenticated as a second terminal device (relay UE); Establish a PC5 connection with a first terminal device (remote UE) (e.g., establish a PC5 connection with a first first terminal device (remote UE)); receiving an RRC setup request and / or an RRC re-establishment request and / or an RRC resume request transmitted by a first terminal device (remote UE); and receiving a SRAP-related configuration for the SL included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or establish, re-establish or modify PC5 SRAP or SL SRAP entities under the following conditions: receiving a SRAP-related configuration for the SL included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or release of PC5 SRAP or SL SRAP entities through at least one of the following processes: A first terminal device (remote UE) switches from communicating with a network device via the second terminal device to communicating directly with the network device (indirect-to-direct path switch); A PC5 connection (e.g., a PC5-RRC connection or a PC5 unicast link) between a first terminal device (remote UE) and a second terminal device (relay UE) is released; and There is no PC5 connection between the first terminal device (remote UE) and the second terminal device (relay UE), and / or establishing a Uu SRAP entity through at least one of the following processes: authorized and / or authenticated as a second terminal device (relay UE); Establishing a PC5 connection with a first terminal device (remote UE); and receiving a SRAP-related configuration for the Uu included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or establish, re-establish or modify a Uu SRAP entity under the following conditions: receiving a related configuration of an SRAP of the SL included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or release of Uu SRAP entities under the following conditions: The second terminal device (relay UE) no longer has a PC5 connection with one first terminal device (remote UE).

[0183] <Example of the tenth aspect> An embodiment of the present invention further provides a communication system, which may include a first terminal device, a second terminal device and a network device, for example, the first terminal device may be the remote UE 101 in Figure 1, the second terminal device may be the relay UE 102 in Figure 1, and the network device may be the network device 100 in Figure 1. Wherein, the first terminal device and the second terminal device may adopt the same terminal device configuration.

[0184] 14 is a diagram showing a terminal device in a communication system according to an embodiment of the tenth aspect. The terminal device shown in FIG. 14 may be used as a first terminal device or a second terminal device.

[0185] 14, the terminal device 1400 may include a processor 1410 (e.g., a central processing unit (CPU)) and a memory 1420, which is connected to the processor 1410. The memory 1420 can store various data and can further store a program 1430 for information processing, and can execute the program 1430 under the control of the processor 1410.

[0186] For example, the processor 1410 may be configured to execute a program to implement the method described in the embodiments of the first or second aspect.

[0187] 14, the terminal device 1400 may further include a transceiver 1440, an antenna 1450, etc., and the functions of these components are the same as those of the prior art, so detailed description thereof will be omitted here. Note that the terminal device 1400 does not need to include all the components shown in Fig. 14. The terminal device 1400 may further include components not shown in Fig. 14, but reference can be made to the prior art for this information.

[0188] FIG. 15 is a diagram showing a network device in a communication system according to an embodiment of the tenth aspect.

[0189] 15, the network device 1500 may include a processor 1510 (e.g., a central processing unit (CPU)) and a memory 1520, which is connected to the processor 1510. The memory 1520 can store various data and can further store a program 1530 for information processing, and can execute the program 1530 under the control of the processor 1510.

[0190] For example, the processor 1510 may be configured to execute a program to implement the method described in the embodiments of the first or second aspect.

[0191] 15, the network device 1500 may further include a transceiver 1540, an antenna 1550, etc., and the functions of these components are the same as those of the prior art, so detailed descriptions thereof will be omitted here. Note that the network device 1500 does not need to include all the components shown in FIG. 15. The network device 1500 may further include components not shown in FIG. 15, but reference can be made to the prior art for such components.

[0192] An embodiment of the present invention further provides a computer program, which, when executed on a first terminal device or a second terminal device, causes the first terminal device or the second terminal device to perform the method described in the embodiments of the first and second aspects.

[0193] An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program causes the first terminal device or the second terminal device to execute the method described in the embodiments of the first and second aspects.

[0194] An embodiment of the present invention further provides a computer program, which, when executed by a network device, causes the network device to perform the method described in the embodiments of the first and second aspects.

[0195] An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program causes a network device to perform the method described in the embodiments of the first and second aspects.

[0196] The above-described devices and methods may be realized by software or hardware, or by a combination of hardware and software. The present invention also relates to a computer-readable program as described below, which, when executed by a logic component, causes the logic component to realize the above-described devices or components, or to perform the above-described methods or steps. The logic component may be, for example, an FPGA (Field Programmable Gate Array), a microprocessor, or a processing unit used in a computer. The present invention also relates to a storage medium, such as a hard disk, magnetic disk, optical hard disk, DVD, or flash memory, that stores the above-described program.

[0197] Furthermore, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, a discrete gate or transistor logic component, a discrete hardware assembly, or any other suitable combination for performing the functions described herein. Also, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be further implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors communicatively coupled with a DSP, or any other configuration.

[0198] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and any modifications to the present invention that do not depart from the spirit of the present invention fall within the technical scope of the present invention.

[0199] Furthermore, the following additional notes are disclosed regarding the above-described embodiments.

[0200] (Appendix 1) 1. A method for transmitting and receiving information, applied to a first terminal device (remote UE), the method comprising: A first terminal device (remote UE) establishes a PC5 connection with a second terminal device (relay UE); and The method includes the first terminal device (remote UE) receiving at least one of a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message by default configuration via the second terminal device (relay UE).

[0201] (Appendix 2) 2. The method of claim 1, comprising: The default configuration includes a default sidelink radio link control bearer configuration and / or a default sidelink relay adaptation protocol (SRAP) related configuration.

[0202] (Appendix 3) 10. The method of claim 2, The default sidelink radio link control bearer configuration is a default sidelink radio link control 0 (SL-RLC0) configuration or a default sidelink radio link control 1 (SL-RLC1) configuration.

[0203] (Appendix 4) 10. The method of claim 2, The method, wherein the associated settings of the default SRAP include at least one of the following: a local or temporary identifier of a first terminal device (remote UE), an additional mapping list, and a deletion mapping list.

[0204] (Appendix 5) 10. The method of claim 2, The method, wherein the associated configuration of the default SRAP includes a default SRAP configuration of signaling radio bearer 0 (SRB0) and / or a default SRAP configuration of signaling radio bearer 1 (SRB1).

[0205] (Appendix 6) 2. The method of claim 1, comprising: A method in which the first terminal device (remote UE) receives a signaling radio bearer 1 (SRB1) message using the default SRAP setting of SRB1 and / or the default setting of SL-RLC1 on the PC5 interface with the second terminal device (relay UE).

[0206] (Appendix 7) 7. The method of claim 6, A method in which the SRB1 message carries the Radio Resource Control Resume (RRC) message and / or the Radio Resource Control Re-establishment (RRC re-establishment) message, or the SRB1 message is the first SRB1 message received by the first terminal device (remote UE) after a signaling radio bearer 0 (SRB0) message of the first terminal device (remote UE) is sent to a network device.

[0207] (Appendix 8) 7. The method of claim 6, further comprising: A method including using, for SRB1, a default SRAP setting of SRB1 and / or a default setting of a used SL-RLC1 when the first terminal device (remote UE) sends a radio resource control re-establishment request (RRC re-establishment request) message or a radio resource control resume (RRC resume request) message, or when the first terminal device (remote UE) initiates a radio resource control re-establishment procedure or a radio resource control resume procedure.

[0208] (Appendix 9) 7. The method of claim 6, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message does not include a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0209] (Appendix 10) 10. The method of claim 9, A method in which the first terminal device (remote UE) transmits a radio resource control resume complete (RRC resume complete) message and / or the radio resource control re-establishment complete (RRC re-establishment complete) message using a default SRAP setting of SRB1 and / or a default setting of SL-RLC1 on a PC5 interface with the second terminal device (relay UE).

[0210] (Appendix 11) 7. The method of claim 6, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message includes related configuration of a Sidelink Relay Adaptation Protocol (SRAP).

[0211] (Appendix 12) 12. The method of claim 11, The first terminal device (remote UE) sends a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message using the associated configuration of the SRAP.

[0212] (Appendix 13) 2. The method of claim 1, comprising: A method in which the first terminal device (remote UE) receives the radio resource control resume (RRC resume) message and / or the radio resource control re-establishment (RRC re-establishment) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on a PC5 interface with the second terminal device (relay UE).

[0213] (Appendix 14) 14. The method of claim 13, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message does not include a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0214] (Appendix 15) 15. The method of claim 14, A method in which the first terminal device (remote UE) transmits a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on a PC5 interface with the second terminal device (relay UE).

[0215] (Appendix 16) 15. The method of claim 14, further comprising: A method including the first terminal device (remote UE) receiving a radio resource control reconfiguration (RRC reconfiguration) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on a PC5 interface with the second terminal device (relay UE).

[0216] (Appendix 17) 14. The method of claim 13, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message includes related configuration of a Sidelink Relay Adaptation Protocol (SRAP).

[0217] (Appendix 18) 18. The method of claim 17, The first terminal device (remote UE) applies the relevant settings of the SRAP, and the first terminal device (remote UE) sends a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message on the PC5 interface with the second terminal device (relay UE).

[0218] (Appendix 19) A method for transmitting and receiving information, applied to a second terminal device (relay UE), the method comprising: A second terminal device (relay UE) establishes a PC5 connection with a first terminal device (remote UE); and The method includes the second terminal device (relay UE) sending at least one of a radio resource control resume (RRC resume) message, a radio resource control re-establishment (RRC re-establishment) message, and a radio resource control reconfiguration (RRC reconfiguration) message to the first terminal device (remote UE) by default configuration.

[0219] (Appendix 20) 19. The method of claim 18, The default configuration includes a default sidelink radio link control bearer configuration and / or a default sidelink relay adaptation protocol (SRAP) related configuration.

[0220] (Appendix 21) 21. The method of claim 20, The default sidelink radio link control bearer configuration is a default sidelink radio link control 0 (SL-RLC0) configuration or a default sidelink radio link control 1 (SL-RLC1) configuration.

[0221] (Appendix 22) 21. The method of claim 20, A method in which the associated settings of the default SRAP include at least one of the following: a local / temporary identifier of a first terminal device (remote UE), an additional mapping list, and a deletion mapping list.

[0222] (Appendix 23) 21. The method of claim 20, The method, wherein the associated configuration of the default SRAP includes a default SRAP configuration of signaling radio bearer 0 (SRB0) and / or a default SRAP configuration of signaling radio bearer 1 (SRB1).

[0223] (Appendix 24) 19. The method of claim 18, A method in which the second terminal device forwards the radio resource control resume (RRC resume) message, radio resource control re-establishment (RRC re-establishment) message, and radio resource control reconfiguration (RRC reconfiguration) message transmitted by a network device to the first terminal device.

[0224] (Appendix 25) 19. The method of claim 18, A method in which the second terminal device (relay UE) transmits a signaling radio bearer 1 (SRB1) message using the default SRAP setting of SRB1 and / or the default setting of SL-RLC1 on the PC5 interface with the first terminal device (remote UE).

[0225] (Appendix 26) 26. The method of claim 25, A method in which the SRB1 message carries the Radio Resource Control Resume (RRC resume) message and / or the Radio Resource Control Re-establishment (RRC re-establishment) message, or the SRB1 message is the first SRB1 message sent by the second terminal device (relay UE) to the first terminal device after the first terminal device (remote UE) sends a Signaling Radio Bearer 0 (SRB0) message to a network device.

[0226] (Appendix 27) 26. The method of claim 25, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message does not include a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0227] (Appendix 28) 28. The method of claim 27, A method in which the second terminal device (relay UE) receives a radio resource control resume complete (RRC resume complete) message and / or the radio resource control re-establishment complete (RRC re-establishment complete) message transmitted by the first terminal device (remote UE) using a default SRAP setting of SRB1 and / or a default setting of SL-RLC1 on the PC5 interface with the first terminal device.

[0228] (Appendix 29) 26. The method of claim 25, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message includes related configuration of a Sidelink Relay Adaptation Protocol (SRAP).

[0229] (Appendix 30) 29. The method of claim 29, A method in which the second terminal device (relay UE) receives a radio resource control resume complete (RRC resume complete) message and / or the radio resource control re-establishment complete (RRC re-establishment complete) message transmitted by the first terminal device based on the associated settings of the SRAP.

[0230] (Appendix 31) 19. The method of claim 18, A method in which the second terminal device (relay UE) transmits the radio resource control resume (RRC resume) message and / or the radio resource control re-establishment (RRC re-establishment) message via a PC5 interface with the first terminal device (remote UE) using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0.

[0231] (Appendix 32) 32. The method of claim 31, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message does not include a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0232] (Appendix 33) 33. The method of claim 32, The second terminal device (relay UE) receives a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on a PC5 interface with the first terminal device (remote UE).

[0233] (Appendix 34) 33. The method of claim 32, further comprising: A method including the second terminal device (relay UE) transmitting a radio resource control reconfiguration (RRC reconfiguration) message using a default SRAP setting of SRB0 and / or a default setting of SL-RLC0 on a PC5 interface with the first terminal device (remote UE).

[0234] (Appendix 35) 32. The method of claim 31, The method, wherein the Radio Resource Control resume (RRC resume) message or the Radio Resource Control re-establishment (RRC re-establishment) message includes related configuration of a Sidelink Relay Adaptation Protocol (SRAP).

[0235] (Appendix 36) 36. The method of claim 35, A method in which the second terminal device (relay UE) receives a radio resource control resume complete (RRC resume complete) message and / or a radio resource control re-establishment complete (RRC re-establishment complete) message via a PC5 interface with the first terminal device (remote UE).

[0236] (Appendix 37) 1. A method for transmitting and receiving information, applied to a first terminal device (remote UE), the method comprising: A first terminal device (remote UE) establishes a PC5 connection with a second terminal device (relay UE); and The first terminal device (remote UE) receives at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message via the second terminal device (relay UE); At least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0237] (Appendix 38) 38. The method of claim 37, After receiving the SRAP related configuration in the RRC setup message, the first terminal device (remote UE) performs at least one of the following operations: Establishing the SRAP entity; Set the parameters of the SRAP entity according to the relevant settings of the SRAP; Applying the terminal device indicator in the RRC setup message as a Cell Radio Network Temporary Identifier (C-RNTI) of the first terminal device (remote UE); and A method for transmitting a radio resource control setup complete (RRC setup complete) message based on the associated configuration of the SRAP.

[0238] (Appendix 39) A method for transmitting and receiving information, applied to a second terminal device (relay UE), the method comprising: A second terminal device (relay UE) establishes a PC5 connection with a first terminal device (remote UE); and The second terminal device (relay UE) transmits at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message to the first terminal device (remote UE); At least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0239] (Appendix 40) 39. The method of claim 39, A method in which the second terminal device forwards the radio resource control resume (RRC resume) message, radio resource control re-establishment (RRC re-establishment) message, and radio resource control reconfiguration (RRC reconfiguration) message sent by a network device to the first terminal device.

[0240] (Appendix 41) 39. The method of claim 39, further comprising: The method includes the second terminal device (relay UE) receiving a radio resource control setup complete (RRC setup complete) message from the first terminal device based on an associated setting of an SRAP.

[0241] (Appendix 42) 1. A method for transmitting and receiving information, applied to a network device, said method comprising: The network device transmits at least one of a radio resource control setup (RRC setup) message, a radio resource control resume (RRC resume) message, and a radio resource control re-establishment (RRC re-establishment) message for the first terminal device (remote UE) to a second terminal device (relay UE); At least one of the RRC setup message, the RRC resume message, and the RRC re-establishment message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration.

[0242] (Appendix 43) 1. A method for transmitting and receiving information, applied to a first terminal device (remote UE), the method comprising: Establishing a Relay Adaptation Protocol (SRAP) (PC5 SRAP or SL SRAP) entity through at least one of the following processes: A first terminal device (remote UE) selects or reselects a second terminal device (relay UE); A first terminal device (remote UE) initiates an RRC connection establishment procedure and / or an RRC re-establishment procedure and / or an RRC resume procedure via a second terminal device (relay UE); A first terminal device (remote UE) sends an RRC setup request and / or an RRC re-establishment request and / or an RRC resume request via a second terminal device (relay UE); A first terminal device (remote UE) receives an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message via a second terminal device (relay UE); and A first terminal device (remote UE) receives an RRC reconfiguration message from the gNB, in which the path is switched to a second terminal device (relay UE) (direct-to-indirect path switch); and / or performing configuration, reconfiguration or modification of a SRAP (PC5 SRAP or SL SRAP) entity in at least one of the following processes: The first terminal device (remote UE) uses the default SRAP related configuration; A first terminal device (remote UE) receives an SRAP-related configuration included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message; and / or performing a release of the SRAP (PC5 SRAP or SL SRAP) entity in at least one of the following processes: The first terminal device (remote UE) switches from communicating with the gNB via a relay to communicating directly with the gNB (indirect-to-direct path switch); A PC5 connection (e.g., a PC5-RRC connection or a PC5 unicast link) between a first terminal device (remote UE) and a second terminal device (relay UE) is released; and A method in which a first terminal device (remote UE) enters a radio resource control idle (RRC_Idle) or radio resource control inactive (RRC_Inactive) state.

[0243] (Appendix 44) A method for transmitting and receiving information, applied to a second terminal device (relay UE), the method comprising: Establishing a SRAP (PC5 SRAP or SL SRAP) entity through at least one of the following processes: authorized and / or authenticated as a second terminal device (relay UE); Establish a PC5 connection with a first terminal device (remote UE) (e.g., establish a PC5 connection with a first first terminal device (remote UE)); receiving an RRC setup request and / or an RRC re-establishment request and / or an RRC resume request transmitted by a first terminal device (remote UE); and receiving a SRAP-related configuration for the SL included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or includes performing the setting, re-setting or modification of PC5 SRAP or SL SRAP entities, i.e. receiving a related configuration of an SRAP of the SL included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or performing the release of a PC5 SRAP or SL SRAP entity by at least one of the following processes: A first terminal device (remote UE) switches from communicating with a network device via the second terminal device to communicating directly with the network device (indirect-to-direct path switch); A PC5 connection (e.g., a PC5-RRC connection or a PC5 unicast link) between a first terminal device (remote UE) and a second terminal device (relay UE) is released; and There is no PC5 connection between the first terminal device (remote UE) and the second terminal device (relay UE), and / or performing the establishment of a Uu SRAP entity by at least one of the following processes: be authorized and / or authenticated as a second terminal device (relay UE); Establishing a PC5 connection with a first terminal device (remote UE); and receiving a SRAP-related configuration for the Uu included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or performing the configuration, reconfiguration or modification of Uu SRAP entities under the following conditions: receiving a related configuration of an SRAP of the SL included in an RRC setup and / or RRC re-establishment and / or RRC resume and / or RRC reconfiguration message transmitted by the gNB; and / or including effecting the release of the Uu SRAP entity under the following conditions: A method in which the second terminal device (relay UE) no longer has a PC5 connection with one first terminal device (remote UE).

Claims

1. An apparatus applicable to a first terminal device, comprising: a processor for controlling the establishment of a PC5 connection with a second terminal device; and a receiver for receiving a radio resource control (RRC) message via the second terminal device according to a default setting; the RRC message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration; the RRC message is an RRC setup message; After the receiver receives the associated configuration of the SRAP in the RRC setup message, the processor: Establishing an SRAP entity; Setting parameters of the SRAP entity based on the associated settings of the SRAP; Applying the terminal device identification (ID) in the RRC setup message as a Cell Radio Network Temporary Identifier (C-RNTI) of the first terminal device; and Send an RRC setup complete message based on the associated configuration of the SRAP. The device controls the device to perform at least one of the operations.

2. 10. The apparatus of claim 1, The RRC message is at least one of an RRC setup message, an RRC reinitiation message, an RRC re-establishment message, and an RRC reconfiguration message.

3. 3. The apparatus of claim 2, The receiver receives a signaling radio bearer 1 (SRB1) message using a default SRAP setting of the signaling radio bearer 1 (SRB1) and / or a default setting of the sidelink radio link control 1 (SL-RLC1) on a PC5 interface between the first terminal device and the second terminal device.

4. 10. The apparatus of claim 1, The default configurations include default sidelink radio link control bearer configurations and / or default sidelink relay adaptation protocol (SRAP) related configurations.

5. 5. The apparatus of claim 4, The default sidelink radio link control bearer configuration is a default sidelink radio link control 0 (SL-RLC0) configuration or a default sidelink radio link control 1 (SL-RLC1) configuration.

6. 5. The apparatus of claim 4, The default SRAP related settings are: a local or temporary identifier of the first terminal device, a mapping list to be added or deleted, and a default SRAP setting for signaling radio bearer 0 (SRB0) and / or a default SRAP setting for signaling radio bearer 1 (SRB1); 10. An apparatus comprising:

7. 4. The apparatus of claim 3, The SRB1 message carries the RRC re-initiation message and / or the RRC re-establishment message; or The SRB1 message is the first SRB1 message received by the first terminal equipment after a signaling radio bearer 0 (SRB0) message of the first terminal equipment is sent to a network device.

8. 4. The apparatus of claim 3, The processor further comprises: An apparatus for controlling SRB1 to use a default SRAP setting of the SRB1 and / or to use a default setting of the SL-RLC1 when the first terminal device sends an RRC re-establishment request message or an RRC re-initiation request message, or when the first terminal device initiates an RRC re-establishment procedure or an RRC re-initiation procedure.

9. 4. The apparatus of claim 3, It further includes a transmitter. The transmitter transmits an RRC reinitiation complete message and / or an RRC reestablishment complete message using the associated configuration of the SRAP; The RRC re-initiation message or the RRC re-establishment message includes the associated configuration of the SRAP.

10. 10. The apparatus of claim 1, The processor further comprises: Selecting or reselecting the second terminal device; Initiating an RRC connection establishment procedure and / or an RRC re-establishment procedure and / or an RRC re-initiation procedure via the second terminal device; receiving an RRC setup and / or RRC re-establishment and / or RRC re-initiation and / or RRC reconfiguration message via the second terminal device; and receiving an RRC reconfiguration message from a network device to perform a path switch to the second terminal device; The apparatus is configured to establish a Relay Adaptation Protocol (SRAP) entity in at least one of the processes.

11. 10. The apparatus of claim 1, The processor further comprises: Use the default SRAP related settings; and receiving associated configuration of SRAP in RRC setup and / or RRC re-establishment and / or RRC restart and / or RRC reconfiguration messages; 20. An apparatus configured to configure, reconfigure or modify an SRAP entity in at least one of the processes.

12. 10. The apparatus of claim 1, The processor further comprises: Switching from communicating with a network device via a relay to communicating directly with said network device; Releasing the PC5 connection between the first terminal device and the second terminal device; and Entering the RRC_Idle or RRC_Inactive state The apparatus is configured to release an SRAP entity in at least one of the processes.

13. An information transmitting and receiving device applicable to a second terminal device, comprising: a processor for controlling the establishment of a PC5 connection with the first terminal device; and a transmitter for transmitting a radio resource control (RRC) message to the first terminal device according to a default setting; the RRC message includes a Sidelink Relay Adaptation Protocol (SRAP) related configuration; the RRC message is an RRC setup message; After the first terminal device receives the associated configuration of the SRAP in the RRC setup message, the first terminal device: Establishing an SRAP entity; Setting parameters of the SRAP entity based on the associated settings of the SRAP; Applying the terminal device identification (ID) in the RRC setup message as a Cell Radio Network Temporary Identifier (C-RNTI) of the first terminal device; and Send an RRC setup complete message based on the associated configuration of the SRAP. The device controls the device to perform at least one of the operations.

14. 14. The apparatus of claim 13, The RRC message is at least one of an RRC re-initiation message, an RRC re-establishment message, and an RRC reconfiguration message.

15. 14. The apparatus of claim 13, The transmitter transmits a signaling radio bearer 1 (SRB1) message using a default SRAP setting of the signaling radio bearer 1 (SRB1) and / or a default setting of a sidelink radio link control 1 (SL-RLC1) on a PC5 interface between the first terminal device and the second terminal device.

16. 15. The apparatus of claim 14, The RRC re-initiation message or the RRC re-establishment message includes associated configuration of a Sidelink Relay Adaptation Protocol (SRAP).

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