A communication method and apparatus

Abstract

The embodiment of the application provides a communication method and device, which are used for improving the beam measurement accuracy of a terminal device in beam failure detection and / or beam failure recovery, improving the success rate of beam measurement, and improving the communication efficiency. In the method, a network device sends a first message to a terminal device in a non-periodic manner, wherein the first message comprises a first reference signal, the first reference signal comprises a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS); and thereafter, the network device receives a measurement result of the terminal device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless communication, and in particular to a communication method and device. BACKGROUND

[0002] In a beam-based communication system, due to the movement of objects around the terminal device or the rotation and occlusion of the terminal device itself, the quality of the beam will be affected. The decline in beam quality will directly lead to a decline in the communication quality between the terminal device and the network device. Therefore, in order to handle such beam failure phenomenon, the new radio (NR) system introduces a beam failure recovery (BFR) mechanism.

[0003] Currently, in the BFR, the network device periodically transmits a reference signal (RS) applied to the BFR to the terminal device, so that the terminal device performs the BFR mechanism to ensure the communication quality with the network device through the RS. Generally, when the network device uses the same bandwidth part (BWP) to communicate with the terminal device, the beam direction of the communication beam can be the same, and therefore, the RS for BFR transmitted by the network device to the terminal device is periodically configured in association with the BWP.

[0004] However, in the above configuration mode, due to the periodic configuration mode associated with the BWP, the current link communication situation cannot be timely reflected, so that the terminal device uses the periodically configured RS to measure the beam and fails, which easily leads to the interruption of the communication beam between the terminal device and the network device, and affects the communication efficiency. SUMMARY

[0005] Embodiments of the present application provide a communication method and device for improving the beam measurement accuracy of the terminal device in beam failure detection and / or beam failure recovery, improving the success rate of beam measurement, and improving the communication efficiency.

[0006] The first aspect of the embodiments of the present application provides a communication method, which can be applied to a network device or a component (such as a processor, a chip or a chip system, etc.) of the network device, in which the network device transmits a first message to a terminal device in a non-periodic manner, wherein the first message includes a first reference signal, and the first reference signal includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS); and thereafter, the network device receives a measurement result of the terminal device.

[0007] Based on the above technical solution, the network device sends a first message for carrying a first reference signal to the terminal device in an aperiodic manner, wherein the first reference signal includes a BFD-RS and / or a BFR-RS, so that the terminal device can perform beam failure detection and / or beam failure recovery according to the aperiodically sent first reference signal. Compared with the periodic configuration manner, the beam measurement accuracy of the terminal device in performing beam failure detection and / or beam failure recovery can be improved, and the success rate of beam measurement can be improved, thereby avoiding the communication beam interruption between the terminal device and the network device and improving the communication efficiency.

[0008] In a possible implementation manner of the first aspect of the embodiment of the present application, the first message includes a downlink control information (DCI) message.

[0009] The first reference signal is carried in a channel system information request (CSI request) field in the DCI message; and / or,

[0010] The first reference signal is carried in a beam failure detection (BF detection) field in the DCI message for beam failure detection; and / or,

[0011] The first reference signal is carried in a candidate beam failure detection (Candidate BF Detection) field in the DCI message for candidate beam selection and / or beam failure detection.

[0012] Based on the above technical solution, the first message sent by the network device to the terminal device in an aperiodic manner can be a DCI message, and the first reference signal carried in the first message can be a channel system information request (CSI request) field, a beam failure detection (BF detection) field for beam failure detection, and / or a candidate beam failure detection (Candidate BF Detection) field for candidate beam selection and / or beam failure detection in the DCI message. When the first message is a DCI message, various implementation manners of the first reference signal in the first message are provided, which realizes the flexible configuration of the first reference signal and improves the realizability of the scheme.

[0013] In a possible implementation manner of the first aspect of the embodiment of the present application, the first message further includes first indication information, and the first indication information is used to indicate the beam direction of the network device sending the DCI message.

[0014] Based on the above technical solution, the network device can further include first indication information in the first message sent to the terminal device in a non-periodic manner, where the first indication information is used to indicate a beam direction of the network device sending the DCI message. Exemplarily, the beam direction can indicate that the network device uses the same beam direction to transceive data, or indicates that the network device uses multiple beam directions to transceive data, so that the terminal device can communicate with the network device according to the beam direction, and improve the system stability based on beam communication.

[0015] In a possible implementation manner of the first aspect of the embodiment of the present application, the network device sends the first message to the terminal device through at least one of the following downlink channels, including:

[0016] a downlink channel indicated by a control resource set corresponding to a first search space, where the first search space is used to search for non-periodic channel system information-reference signal (CSI-RS); or

[0017] a downlink channel indicated by a control resource set corresponding to a second search space, where the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

[0018] Based on the above technical solution, the network device can send the first message to the terminal device through a downlink channel associated with the first search space or the second search space, providing multiple implementation manners of the downlink channel carrying the first message, realizing flexible sending of the first reference signal, and improving the realizability of the scheme.

[0019] In a possible implementation manner of the first aspect of the embodiment of the present application, the first message further includes a time parameter of the first reference signal, where the time parameter includes a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold, where the first time length threshold is used to indicate a time length allowing the terminal device to perform listen before talk (LBT).

[0020] Optionally, the time parameter can indicate a start time, an end time, and / or a timer, and the like.

[0021] Based on the above technical solution, the first message sent in a non-periodic manner can further include a time parameter of the first reference signal, where the time parameter includes a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold. The specific time parameter for the terminal device to perform measurement is provided, so that the terminal device can use the first reference signal to perform measurement according to the time parameter, that is, the terminal device and the network device align the measurement process through the time parameter, and further improve the communication efficiency.

[0022] In a possible implementation of the first aspect of the embodiment of the application, the time length indicated by the time parameter is less than a maximum channel occupancy time (MCOT) or a remaining channel occupancy time (COT).

[0023] Based on the above technical solution, in the time parameter of the first reference signal, any time length indicated by the time parameter is less than the MCOT or the COT, which ensures that different terminal devices can reasonably coexist and reduce transmission collision when communicating on a shared frequency band, and further improves communication efficiency.

[0024] In a possible implementation of the first aspect of the embodiment of the application, the first message further includes a measurement number of the first reference signal and / or a number of times of allowing the terminal device to perform the LBT.

[0025] Based on the above technical solution, in the first message sent in a non-periodic manner, the execution number of the first reference signal can also be included, which includes the measurement number of the first reference signal and / or the number of times of allowing the terminal device to perform the LBT, so that the terminal device measures using the first parameter according to the execution number, that is, the terminal device and the network device align the measurement process through the execution number, and further improve the communication efficiency.

[0026] In a possible implementation of the first aspect of the embodiment of the application, before the network device sends the first message to the terminal device, the method further includes:

[0027] The network device determines that the number of non-acknowledgement information (NACK) from the terminal device is greater than a first threshold; and / or,

[0028] The network device determines that the number of listen before talk (LBT) failures is greater than a second threshold.

[0029] Based on the above technical solution, when the network device receives the non-acknowledgement information (NACK) from the terminal device, the number of which is greater than the first threshold, or when the number of LBT failures of the network device is greater than the second threshold, that is, when the network device determines that the communication quality between the network device and the terminal device is poor, the network device sends the first message to the terminal device in a non-periodic manner. The terminal device can perform beam measurement according to the first parameter, so as to ensure the smoothness of beam communication between the network device and the terminal device, and avoid interruption of the communication beam therebetween.

[0030] In a possible implementation of the first aspect of the embodiment of the application, when the network device determines that the LBT is successful, the network device sends the first message to the terminal device.

[0031] Based on the above technical solution, the network device needs to perform LBT before transmitting the first message in a non-periodic manner, and only when the LBT is successful, the network device transmits the first message to the terminal device. Therefore, the success rate of transmitting the first message can be improved, and when the network environment is relatively busy, transmission collision can be reduced, and communication efficiency can be further improved.

[0032] In a possible implementation of the first aspect of the embodiment, the first message includes a MAC CE (Control Element) for activating a medium access control.

[0033] Based on the above technical solution, the first message transmitted by the network device to the terminal device in a non-periodic manner can also include an activation MAC CE message, that is, the first message can include a first reference signal and an activation MAC CE. The activation MAC CE can indicate time-frequency domain resources carrying the first reference signal, and the network device transmits the first reference signal to the terminal device after transmitting the activation MAC CE in the first message to the terminal device. Therefore, another implementation of the first message is provided, and the flexibility of the scheme implementation is improved.

[0034] In a possible implementation of the first aspect of the embodiment, before the network device transmits the first message to the terminal device, the method further includes:

[0035] The network device receives a first request message from the terminal device, and the first request message is used to request the first reference signal.

[0036] Based on the above technical solution, the network device receives the first request message from the terminal device for requesting the first reference signal, and then the network device triggers to transmit the first message to the terminal device in a non-periodic manner. That is, the network device transmits the first message in a non-periodic manner based on the request of the terminal device. The terminal device can actively request the first reference signal when determining that the beam quality is poor, which can ensure the communication quality between the terminal device and the network device. Correspondingly, for the network device, the network device can subsequently trigger to perform the process of transmitting the first message to the terminal device according to the first request message, without separately configuring the transmission strategy of the first message, which can further save the signaling consumption of the network device.

[0037] In a possible implementation of the first aspect of the embodiment, the network device receives the first request message from the terminal device through at least one of the following uplink channels, including:

[0038] an uplink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used to search for a non-periodic CSI-RS; or

[0039] an uplink channel indicated by a control resource set associated with the second search space, wherein the second search space is configured in a periodically configured beam failure detection and / or beam failure recovery parameter; or

[0040] an uplink channel corresponding to a supplementary uplink (SUL).

[0041] Based on the above technical solution, the terminal device can send the first request message to the network device through the uplink channel associated with the first search space or the second search space, or the uplink channel corresponding to the SUL. Multiple implementation manners of the uplink channel carrying the first request message are provided, which realizes flexible sending of the first request message and improves the realizability of the solution.

[0042] In a possible implementation manner of the first aspect of the embodiment of the present application, the at least one uplink channel is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH), and a reference signal (RS) indicated by the at least one uplink channel is associated with an RS indicated by a control resource set corresponding to the second search space.

[0043] Based on the above technical solution, the uplink channel carrying the first request message can be a PUCCH, a PUSCH, or a PRACH, and an RS indicated by the uplink channel is associated with an RS indicated by a control resource set corresponding to the second search space. The second search space is from the configuration of the network device to the terminal device, and the use of the RS corresponding to the RS associated with the control resource set corresponding to the second search space to send the first request message can make the network device and the terminal device align the carrying manner of the first request message.

[0044] The second aspect of the embodiment of the present application provides a communication method, which can be applied to a terminal device, or can be applied to a component (such as a processor, a chip, or a chip system) of the terminal device. In the method, the terminal device receives a first message sent by a network device in a non-periodic manner, the first message includes a first reference signal, and the first reference signal includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS). Thereafter, the terminal device obtains a measurement result according to the first reference signal and sends the measurement result to the network device.

[0045] Based on the technical solution, the terminal device receives the first message for carrying the first reference signal from the network device in a non-periodic manner, wherein the first reference signal includes the BFD-RS and / or the BFR-RS, so that the terminal device can perform beam failure detection and / or beam failure recovery according to the first reference signal in the first message. Compared with the periodic configuration manner, the beam measurement accuracy of the terminal device in performing the beam failure detection and / or the beam failure recovery can be improved, the success rate of the beam measurement is improved, thereby avoiding the communication beam interruption between the terminal device and the network device, and improving the communication efficiency.

[0046] In a possible implementation manner of the second aspect of the embodiment of the application, the first message includes a downlink control information (DCI) message.

[0047] The first reference signal is carried in a channel system information request (CSI request) field in the DCI message; and / or,

[0048] The first reference signal is carried in a beam failure detection (BF detection) field for beam failure detection in the DCI message; and / or,

[0049] The first reference signal is carried in a candidate beam failure detection (Candidate BF Detection) field for candidate beam selection and / or beam failure detection in the DCI message.

[0050] Based on the technical solution, the terminal device receives the first message for carrying the first reference signal from the network device in a non-periodic manner, wherein the first reference signal includes the BFD-RS and / or the BFR-RS, so that the terminal device can perform beam failure detection and / or beam failure recovery according to the first reference signal in the first message. Compared with the periodic configuration manner, the beam measurement accuracy of the terminal device in performing the beam failure detection and / or the beam failure recovery can be improved, the success rate of the beam measurement is improved, thereby avoiding the communication beam interruption between the terminal device and the network device, and improving the communication efficiency.

[0051] In a possible implementation manner of the second aspect of the embodiment of the application, the first message further includes first indication information, and the first indication information is used to indicate the beam direction of the network device for sending the DCI message.

[0052] Based on the technical solution, the terminal device receives the first message sent by the network device in a non-periodic manner, and the first message further includes first indication information. The first indication information is used to indicate a beam direction of the network device for sending the DCI message. For example, the beam direction can indicate that the network device uses the same beam direction to receive and send data, or indicates that the network device uses multiple beam directions to receive and send data, so that the terminal device can communicate with the network device according to the beam direction, and the system stability based on beam communication is improved.

[0053] In a possible implementation manner of the second aspect of the embodiment, the terminal device receives the first message sent by the network device in a non-periodic manner through at least one of the following downlink channels.

[0054] a downlink channel indicated by a control resource set corresponding to the first search space, where the first search space is used to search for non-periodic channel system information-reference signal (CSI-RS); or

[0055] a downlink channel indicated by a control resource set corresponding to the second search space, where the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

[0056] Based on the technical solution, the terminal device can receive the first message sent by the network device through the downlink channel associated with the first search space or the second search space, and multiple implementation manners of the downlink channel carrying the first message are provided, so that the flexible sending of the first reference signal is implemented, and the realizability of the scheme is improved.

[0057] In a possible implementation manner of the second aspect of the embodiment, the first message further includes a time parameter of the first reference signal, and the time parameter includes a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold. The first time length threshold is used to indicate a time length during which the terminal device is allowed to perform listen before talk (LBT).

[0058] Optionally, the time parameter can indicate a start time, an end time, and / or a timer.

[0059] Based on the technical solution, the first message sent in a non-periodic manner can further include a time parameter of the first reference signal, where the time parameter includes a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold. The specific time parameter for measurement of the terminal device is provided, so that the terminal device can use the first reference signal for measurement according to the time parameter, that is, the terminal device and the network device align the measurement process through the time parameter, and the communication efficiency is further improved.

[0060] In a possible implementation manner of the second aspect of the embodiment of the present application, the time length indicated by the time parameter is less than a maximum channel occupancy time (MCOT) or a remaining channel occupancy time (COT).

[0061] Based on the above technical solution, in the time parameter of the first reference signal, any time length indicated by the time parameter is less than the MCOT or the COT, which ensures that different terminal devices can reasonably coexist and reduce transmission collision when communicating on the shared frequency band, and further improves the communication efficiency.

[0062] In a possible implementation manner of the second aspect of the embodiment of the present application, the first message further includes a measurement number of the first reference signal and / or a number of times of allowing the terminal device to perform the LBT.

[0063] Based on the above technical solution, in the first message sent in the aperiodic manner, the execution number of the first reference signal can also be included, the execution number can include the measurement number of the first reference signal and / or the number of times of allowing the terminal device to perform the LBT, so that the terminal device measures according to the execution number using the first parameter, that is, the terminal device and the network device align the measurement process through the execution number, and the communication efficiency is further improved.

[0064] In a possible implementation manner of the second aspect of the embodiment of the present application, before the terminal device receives the first message from the network device, the method further includes:

[0065] The terminal device sends a first request message to the network device, and the first request message is used to request the first reference signal.

[0066] Based on the above technical solution, the terminal device receives the first message from the network device only after the terminal device sends the first request message to the network device to request the first reference signal, that is, the network device sends the first message in the aperiodic manner based on the request of the terminal device. Wherein, the terminal device can actively request the first reference signal when it is determined that the beam quality is poor, which can ensure the communication quality between the terminal device and the network device. Correspondingly, for the network device, the network device can trigger the process of sending the first message to the terminal device according to the first request message, and does not need to configure the sending strategy of the first message separately, which can further save the signaling consumption of the network device.

[0067] In a possible implementation manner of the second aspect of the embodiment of the present application, the terminal device sends the first request message to the network device when at least one of the following conditions is met, including:

[0068] The terminal device determines that demodulation of a target downlink message fails in a first time period, the target downlink message being carried in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) between the network device and the terminal device;

[0069] Or,

[0070] The terminal device determines that a number of listen-before-talk (LBT) failures in a second time period is greater than a preset threshold.

[0071] Based on the above technical solution, when the terminal device determines that demodulation of a target downlink message fails in a first time period, the target downlink message being carried in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) between the network device and the terminal device, or when the terminal device determines that a number of listen-before-talk (LBT) failures in a second time period is greater than a preset threshold, the terminal device sends a first request message for requesting a first reference signal to the network device when determining that the communication quality between the terminal device and the network device is poor. Subsequently, the terminal device can perform beam measurement according to the first parameter to ensure the smoothness of beam communication between the network device and the terminal device and avoid interruption of the communication beam therebetween.

[0072] In a possible implementation manner of the second aspect of the embodiment of the present application, the terminal device sends the first request message to the network device through at least one of the following uplink channels:

[0073] an uplink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used for searching for an aperiodic CSI-RS; or,

[0074] an uplink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in a periodically configured beam failure detection and / or beam failure recovery parameter; or,

[0075] an uplink channel corresponding to a supplementary uplink (SUL).

[0076] Based on the above technical solution, the terminal device can send the first request message to the network device through an uplink channel corresponding to the first search space or the second search space or an uplink channel corresponding to the SUL. Multiple implementation manners of the uplink channel carrying the first request message are provided, which realizes flexible sending of the first request message and improves the realizability of the scheme.

[0077] In a possible implementation of the second aspect of the embodiment of the application, the at least one uplink channel is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH), and the reference signal (RS) indicated by the at least one uplink channel is associated with the RS indicated by the control resource set corresponding to the second search space.

[0078] Based on the above technical solution, the uplink channel carrying the first request message can be a PUCCH, a PUSCH, or a PRACH, and the RS indicated by the uplink channel is associated with the RS indicated by the control resource set corresponding to the second search space. The second search space is configured by the network device for the terminal device, and the uplink channel corresponding to the RS associated with the RS indicated by the control resource set corresponding to the second search space is used to send the first request message, so that the network device and the terminal device can align the bearing mode of the first request message.

[0079] In a possible implementation of the second aspect of the embodiment of the application, the first message includes an activated medium access control control element (MAC CE).

[0080] Based on the above technical solution, the first message received by the terminal device from the network device sent in a non-periodic manner can also include an activated MAC CE message, that is, the first message can include a first reference signal and an activated MAC CE. The activated MAC CE can indicate time-frequency domain resources carrying the first reference signal, and the terminal device receives the first reference signal in the first message after receiving the activated MAC CE from the network device. Thus, another implementation of the first message is provided, and the flexibility of the scheme implementation is improved.

[0081] The third aspect of the embodiment of the application provides a communication device, including a transceiver unit:

[0082] The transceiver unit is configured to send a first message to a terminal device in a non-periodic manner, the first message including a first reference signal, the first reference signal including a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS).

[0083] The transceiver unit is further configured to receive a measurement result of the terminal device.

[0084] In a possible implementation of the third aspect of the embodiment of the application, the first message includes a downlink control information (DCI) message.

[0085] The first reference signal is carried in a channel system information request (CSI request) field in the DCI message; and / or,

[0086] The first reference signal is carried in a beam failure detection (BFdetection) field in the DCI message for beam failure detection; and / or,

[0087] The first reference signal is carried in a candidate beam failure detection (Candidate BF Detection) field in the DCI message for candidate beam selection and / or beam failure detection.

[0088] In a possible implementation manner of the third aspect of the embodiments of the present application, the first message further includes first indication information, the first indication information being used for indicating a beam direction in which the network device sends the DCI message.

[0089] In a possible implementation manner of the third aspect of the embodiments of the present application, the transceiver sends the first message to the terminal device through at least one of the following downlink channels, including:

[0090] a downlink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used for searching for aperiodic channel system information-reference signal (CSI-RS); or

[0091] a downlink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

[0092] In a possible implementation manner of the third aspect of the embodiments of the present application, the first message further includes a time parameter of the first reference signal, the time parameter including a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold, wherein the first time length threshold is used for indicating a time length in which the terminal device is allowed to perform listen before talk (LBT).

[0093] In a possible implementation manner of the third aspect of the embodiments of the present application, the time length indicated by the time parameter is less than a maximum channel occupancy time (MCOT) or a remaining channel occupancy time (COT).

[0094] In a possible implementation manner of the third aspect of the embodiments of the present application, the first message further includes a measurement number of the first reference signal and / or a number of times in which the terminal device is allowed to perform the LBT.

[0095] In a possible implementation manner of the third aspect of the embodiments of the present application, before the transceiver sends the first message to the terminal device, the apparatus further includes a processing unit;

[0096] The processing unit is configured to determine that a number of non-acknowledgement (NACK) information from the terminal device is greater than a first threshold; and / or,

[0097] The processing unit is configured to determine that the number of times of LBT failure is greater than a second threshold.

[0098] In a possible implementation of the third aspect of the embodiments of the present application, when the LBT is determined to be successful, the transceiver sends a first message to the terminal device.

[0099] In a possible implementation of the third aspect of the embodiments of the present application, the first message comprises a medium access control control element (MAC CE) for activating the medium access control (MAC).

[0100] In a possible implementation of the third aspect of the embodiments of the present application, before the transceiver sends the first message to the terminal device, the transceiver is further configured to receive a first request message from the terminal device, the first request message being used to request the first reference signal.

[0101] In a possible implementation of the third aspect of the embodiments of the present application, the transceiver receives the first request message from the terminal device through at least one uplink channel, comprising:

[0102] an uplink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used to search for an aperiodic CSI-RS; or

[0103] an uplink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in a periodically configured beam failure detection and / or beam failure recovery parameter; or

[0104] an uplink channel corresponding to a supplementary uplink (SUL).

[0105] In a possible implementation of the third aspect of the embodiments of the present application, the at least one uplink channel is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH), and a reference signal (RS) indicated by the at least one uplink channel is associated with an RS indicated by a control resource set corresponding to the second search space.

[0106] In the third aspect of the embodiments of the present application, the component modules of the communication device can also be used to perform the steps performed in the various possible implementations of the first aspect, and the details can be referred to the first aspect, which will not be described here.

[0107] The fourth aspect of the embodiments of the present application provides a communication device, comprising a transceiver;

[0108] The transceiver is configured to receive a first message sent by a network device in an aperiodic manner, the first message comprising a first reference signal, the first reference signal comprising a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS).

[0109] The transceiver is further configured to obtain a measurement result according to the first reference signal and send the measurement result to the network device.

[0110] In a possible implementation manner of the fourth aspect of the embodiments of the present application, the first message includes a downlink control information (DCI) message.

[0111] The first reference signal is carried in a channel system information request (CSI request) field in the DCI message; and / or

[0112] The first reference signal is carried in a beam failure detection (BF detection) field in the DCI message for beam failure detection; and / or

[0113] The first reference signal is carried in a candidate beam failure detection (Candidate BF Detection) field in the DCI message for candidate beam selection and / or beam failure detection.

[0114] In a possible implementation manner of the fourth aspect of the embodiments of the present application, the first message further includes first indication information, the first indication information being used to indicate a beam direction in which the network device sends the DCI message.

[0115] In a possible implementation manner of the fourth aspect of the embodiments of the present application, the transceiver receives the first message sent by the network device in a non-periodic manner through at least one of the following downlink channels, including:

[0116] a downlink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used to search for non-periodic channel system information-reference signal (CSI-RS); or

[0117] a downlink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

[0118] In a possible implementation manner of the fourth aspect of the embodiments of the present application, the first message further includes a time parameter of the first reference signal, the time parameter including a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold, wherein the first time length threshold is used to indicate a time length in which a listen before talk (LBT) is allowed to be performed by the terminal device.

[0119] In a possible implementation manner of the fourth aspect of the embodiments of the present application, the time length indicated by the time parameter is less than a maximum channel occupancy time (MCOT) or a remaining channel occupancy time (COT).

[0120] In a possible implementation manner of the fourth aspect of the embodiment of the present application, the first message further comprises a measurement number of the first reference signal and / or a number of times of allowing the terminal device to perform the LBT.

[0121] In a possible implementation manner of the fourth aspect of the embodiment of the present application, before the transceiver receives the first message from the network device, the transceiver is further configured to send a first request message to the network device, the first request message being used for requesting the first reference signal.

[0122] In a possible implementation manner of the fourth aspect of the embodiment of the present application, the apparatus further comprises a processing unit, and the transceiver sends the first request message to the network device when at least one of the following conditions is met, comprising:

[0123] The processing unit determines that demodulation of a target downlink message fails in a first time period, and the target downlink message is carried in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) between the network device and the terminal device.

[0124] Or,

[0125] The processing unit determines that a number of times of failure of listen before talk (LBT) in a second time period is greater than a preset threshold.

[0126] In a possible implementation manner of the fourth aspect of the embodiment of the present application, the transceiver sends the first request message to the network device through at least one of the following uplink channels, comprising:

[0127] an uplink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used for searching for an aperiodic CSI-RS; or,

[0128] an uplink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in a periodically configured beam failure detection and / or beam failure recovery parameter; or,

[0129] an uplink channel corresponding to a supplementary uplink (SUL).

[0130] In a possible implementation manner of the fourth aspect of the embodiment of the present application, the at least one uplink channel is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) or a physical random access channel (PRACH), and a reference signal (RS) indicated by the at least one uplink channel is associated with an RS indicated by a control resource set corresponding to the second search space.

[0131] In a possible implementation manner of the fourth aspect of the embodiment of the present application, the first message comprises a medium access control (MAC) control element (CE).

[0132] In a fourth aspect, the constituent modules of the communication apparatus can also be configured to perform the steps performed in the various possible implementation manners of the second aspect, and details can be referred to the second aspect, which will not be repeated here.

[0133] In a fifth aspect, the communication apparatus can be a network device or a component (e.g., a processor, a chip, or a chip system) of the network device, and the communication apparatus comprises a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a computer program or an instruction, so that the method of the first aspect or any one of the possible implementation manners of the first aspect is performed.

[0134] In a sixth aspect, the communication apparatus can be a terminal device or a component (e.g., a processor, a chip, or a chip system) of the terminal device, and the communication interface is coupled to the processor, and the processor is configured to run a computer program or an instruction, so that the method of the second aspect or any one of the possible implementation manners of the second aspect is performed.

[0135] In a seventh aspect, the present application provides a computer readable storage medium storing one or more computer-executable instructions, when the computer-executable instructions are executed by a processor, the processor executes the method of the first aspect or any one of the possible implementation manners of the first aspect.

[0136] In an eighth aspect, the present application provides a computer readable storage medium storing one or more computer-executable instructions, when the computer-executable instructions are executed by a processor, the processor executes the method of the second aspect or any one of the possible implementation manners of the second aspect.

[0137] In a ninth aspect, the present application provides a computer program product (or computer program) storing one or more computer programs, when the computer program product is run on a computer, the computer executes the first aspect or any one of the possible implementation manners of the first aspect.

[0138] In a tenth aspect, the present application provides a computer program product storing one or more computer programs, when the computer program product is run on a computer, the computer executes the method of the second aspect or any one of the possible implementation manners of the second aspect.

[0139] The eleventh aspect of the embodiments of the present application provides a chip system, which comprises a processor, and is configured to support the access network device to implement the functions of the first aspect or any possible implementation manner of the first aspect. In a possible design, the chip system can further comprise a memory, which is configured to store necessary program instructions and data of the access network device. The chip system can be composed of a chip, or can comprise the chip and other discrete devices.

[0140] The twelfth aspect of the embodiments of the present application provides a chip system, which comprises a processor, and is configured to support the terminal device to implement the functions of the second aspect or any possible implementation manner of the second aspect. In a possible design, the chip system can further comprise a memory, which is configured to store necessary program instructions and data of the terminal device. The chip system can be composed of a chip, or can comprise the chip and other discrete devices.

[0141] The thirteenth aspect of the embodiments of the present application provides a communication system, which comprises the communication apparatus of the third aspect and the communication apparatus of the fourth aspect, or the communication apparatus of the fifth aspect and the communication apparatus of the sixth aspect, or the communication apparatus of the seventh aspect and the communication apparatus of the eighth aspect, or the communication apparatus of the ninth aspect and the communication apparatus of the tenth aspect, or the communication apparatus of the eleventh aspect and the communication apparatus of the twelfth aspect.

[0142] The technical effects brought by the third, fifth, seventh, ninth, eleventh, thirteenth aspects or any possible implementation manner thereof can refer to the technical effects brought by the first aspect or different possible implementation manners of the first aspect, which will not be repeated here.

[0143] The technical effects brought by the fourth, sixth, eighth, tenth, twelfth, thirteenth aspects or any possible implementation manner thereof can refer to the technical effects brought by the second aspect or different possible implementation manners of the second aspect, which will not be repeated here.

[0144] From the above technical solutions, in some embodiments of the present application, the network device sends a first message to the terminal device in an aperiodic manner, wherein the first message includes the first reference signal, and the first reference signal includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS); thereafter, the network device receives the measurement result of the terminal device. Wherein, the network device sends a first message for carrying the first reference signal to the terminal device in an aperiodic manner, wherein the first reference signal includes BFD-RS and / or BFR-RS, so that the terminal device can perform beam failure detection and / or beam failure recovery according to the first reference signal sent by the network device in an aperiodic manner. Compared with the periodic configuration manner, the beam measurement accuracy of the terminal device in performing beam failure detection and / or beam failure recovery can be improved, and the success rate of beam measurement can be improved, so as to avoid the interruption of communication beams between the terminal device and the network device, and improve the communication efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0145] Figure 1 An example of a network communication architecture in an embodiment of the present application is shown in the figure;

[0146] Figure 2 Another example of a network communication architecture in an embodiment of the present application is shown in the figure;

[0147] Figure 3 An example of a beam failure recovery mechanism (BFR) implementation in an embodiment of the present application is shown in the figure;

[0148] Figure 4 An example of a communication method in an embodiment of the present application is shown in the figure;

[0149] Figure 5 Another example of a communication method in an embodiment of the present application is shown in the figure;

[0150] Figure 6 Another example of a communication method in an embodiment of the present application is shown in the figure;

[0151] Figure 7 Another example of a communication method in an embodiment of the present application is shown in the figure;

[0152] Figure 8 Another example of a communication method in an embodiment of the present application is shown in the figure;

[0153] Figure 9 Another example of a communication method in an embodiment of the present application is shown in the figure;

[0154] Figure 10 Another example of a communication method in an embodiment of the present application is shown in the figure;

[0155] Figure 11 Another schematic diagram of a communication method in an embodiment of the present application;

[0156] Figure 12 Another schematic diagram of a communication method in an embodiment of the present application;

[0157] Figure 13 A schematic diagram of a communication device in an embodiment of the present application;

[0158] Figure 14 Another schematic diagram of a communication device in an embodiment of the present application;

[0159] Figure 15 Another schematic diagram of a communication device in an embodiment of the present application;

[0160] Figure 16 Another schematic diagram of a communication device in an embodiment of the present application. DETAILED DESCRIPTION

[0161] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0162] First, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0163] (1) Terminal device: can be a wireless terminal device capable of receiving network device scheduling and indication information, the wireless terminal device can be a device providing voice and / or data connectivity to a user, or a handheld device with wireless connection function, or other processing devices connected to a wireless modem.

[0164] A terminal device can communicate with one or more core networks or the Internet via a radio access network (RAN), and the terminal device can be a mobile terminal device, such as a mobile phone (or called "cellular" phone, mobile phone), a computer, and a data card, for example, which can be a portable, pocket, hand-held, computer-embedded, or vehicle-mounted mobile device that exchanges voice and / or data with the radio access network. For example, a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a Pad, a computer with wireless transceiver function, and the like. The wireless terminal device can also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a remote station, an access point (AP), a remote terminal, an access terminal, a user terminal, a user agent, a subscriber station (SS), a customer premises equipment (CPE), a terminal, a user equipment (UE), a mobile terminal (MT), and the like. The terminal device can also be a wearable device and a terminal device in a next-generation communication system, such as a terminal device in a 5G communication system or a terminal device in a future evolved public land mobile network (PLMN), and the like.

[0165] (2) Network device: can be a device in a wireless network, for example, the network device can be a radio access network (RAN) node (or device) that accesses a terminal device to a wireless network, which can also be referred to as a base station. At present, some examples of RAN devices are: a new generation base station (gNodeB) in a 5G communication system, a transmission reception point (TRP), an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (for example, a home evolved Node B, or a home Node B, HNB), a baseband unit (BBU), or a wireless fidelity (Wi-Fi) access point (AP), etc. In addition, in one network structure, the network device can include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node.

[0166] Among them, the network device can send configuration information (for example, carried in a scheduling message and / or an indication message) to the terminal device, and the terminal device further performs network configuration according to the configuration information, so that the network configuration between the network device and the terminal device is aligned; or, through the preset network configuration of the network device and the preset network configuration of the terminal device, the network configuration between the network device and the terminal device is aligned. Specifically, "alignment" means that when there is an interactive message between the network device and the terminal device, the two are consistent in understanding the carrier frequency of the interactive message transmission and reception, the determination of the interactive message type, the meaning of the field information carried in the interactive message, or other configurations of the interactive message.

[0167] In addition, in other possible cases, the network device can be other devices that provide wireless communication functions for the terminal device. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device. For the convenience of description, the embodiments of the present application do not limit.

[0168] The network device can also include a core network device, for example, including an access and mobility management function (AMF), a user plane function (UPF), or a session management function (SMF), etc.

[0169] In the embodiments of the present application, the device for implementing the function of the network device can be the network device, or a device capable of supporting the network device to implement the function, such as a chip system, which can be installed in the network device. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the network device is taken as an example to describe the technical solutions provided in the embodiments of the present application.

[0170] (3) The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "At least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, "at least one of A, B and C" includes A, B, C, AB, AC, BC or ABC. In addition, unless otherwise specified, the ordinal numbers "first", "second", etc. mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, time sequence, priority or importance of the multiple objects.

[0171] As an auxiliary licensed band, deploying a communication system on a shared band not only can improve the throughput of the communication system, but also can solve the problem of spectrum resource shortage. Under the background framework of the fifth generation mobile communication technology, the technology deployed on the shared band is uniformly called new radio unlicensed (NRU).

[0172] The present application can be applied to, for example, Figure 1A communication system in a non-licensed band is shown, including a network device and a plurality of terminal devices (UEs). In the communication system, UEs 1-5 can all communicate with the network device, and the link environment includes uplink, downlink, and side link (side-link). The information transmitted in the link includes actual data information and control information for indicating or scheduling the actual data. Meanwhile, UEs 3, 4, and 5 can also form a communication system, and the link transmission environment is consistent with the foregoing. The specific information interaction can rely on the configuration mode of the network.

[0173] On the shared band, in addition to the current new radio (NR) system, other systems such as radar, wireless fidelity (WIFI), Bluetooth, and other access systems of different operators are also included. Therefore, regulations require that a system operating on a shared band support all or part of the following key technologies, i.e., a listen before talk (LBT) mechanism, a transmit power control (TPC) mechanism, and a dynamic frequency selection (DFS) mechanism. The LBT mechanism means that various access devices need to acquire the interference on the target channel before using the channel. Only when the interference level on the target channel is less than or equal to a preset threshold value, the channel can be used. The TPC mechanism means that in order not to affect the normal communication of other access devices, a transmitting device operating on a shared license cannot unlimitedly increase its transmission power. The DFS mechanism means that a system operating on a shared license needs to avoid the frequency band of a high-priority system in time and dynamically switch to a frequency band with lower interference.

[0174] In addition, unlike the fourth generation mobile system, NR is a beam-based communication system, i.e., a transmitter and a receiver communicate by adjusting to a suitable beam direction, as follows Figure 2To achieve that the terminal and the base station can accurately acquire the transmission and reception beam of the transceiver, the NR system associates the beam with the reference signal (RS), that is, one beam corresponds to one RS, and the network device or the terminal can acquire the transmission or reception direction of the beam through the identified RS ID. The RS here mainly includes synchronization information block (SS / PBCH block), channel system information-reference signal (CSI-RS) and sounding reference signal (SRS), wherein the SRS is a reference signal for acquiring the uplink quality.

[0175] The above-mentioned beam-based communication system improves the reliability of system transmission to a certain extent. However, at the same time, due to the movement of surrounding environmental objects or the rotation and shielding of the terminal device itself, the quality of the beam will decrease sharply. Especially for higher frequency bands, such as 58 gigahertz to 71 gigahertz, the system working in this frequency band will use a more narrow beam, such as the frequency region 2 (FR2), which includes 6 GHz to 52.6 GHz, and a maximum of 64 beams are used. The decline of the beam quality will cause the UE to be unable to receive the control information in the physical downlink control channel (PDCCH). Therefore, in order to deal with this beam failure phenomenon, the NR system introduces the beam failure recovery mechanism (BFR).

[0176] The following exemplary describes the BFR process with the network device as the base station and the terminal device as the UE, and the specific process is as follows:

[0177] In step 1 and step 2, the base station configures the UE with downlink reference signals, such as SS / PBCH Block and / or CSI-RS, for beam failure detection and candidate beam sounding, respectively, each of which corresponds to a beam. Assume that the reference signal set for beam failure detection is RS1 set, which can be specifically beam failure detection-reference signal (BFD-RS) and can be configured in Radio Link Monitoring Config. The reference signal set for candidate beam sounding is RS2 set, which can be specifically beam failure recovery-reference signal (BFR-RS) and can be configured in candidateBeamRSList.

[0178] Further, after step 1 and step 2, the UE measures RS1 set and RS2 set, respectively. Within a predefined time, when the layer 1-signal-to-interference-and-noise ratio (L1-SINR) of all RSs in the detected RS1 set is lower than a threshold and the L1-SINR or layer 1-reference signal received power (L1-RSRP) of some or certain RSs in the RS2 set is higher than a threshold, the UE reports the measurement result information to the higher layer (internal to the UE). The threshold can be configured by the base station for the UE or pre-configured in the UE.

[0179] In step 3, the UE subsequently initiates random access (RA) to the base station to request radio resource control (RRC) re-establishment.

[0180] 4) The UE listens to the specified PDCCH in the random access response (RAR) window to obtain the related RRC reconfiguration information.

[0181] It needs to be further explained that steps 3) and 4) are a conventional random access process, which can support two access mechanisms of contention-based and non-contention-based. After the terminal initiates RA through a physical random access channel (PRACH) channel, the PDCCH is listened to within the RAR window to determine whether the access is successful. Among them, the RRC information after the reconstruction will be different from the RRC information before the reconstruction, and the former can be understood as a configuration more suitable for the current link condition.

[0182] Generally, when the network device communicates with the terminal device using the same bandwidth part (BWP), the beam direction of the communication beam can be the same, and the RS sent by the network device to the terminal device for BFR is periodically configured in association with the BWP. Therefore, in the prior art, Figure 3 , for the BFD-RS for beam failure detection and the BFR-RS for candidate beam selection, they are a periodic reference signal, which only changes with the change of the "downlink bandwidth part (BWP-Downlink)" and the "uplink bandwidth part (BWP-Uplink)".

[0183] However, for systems operating in higher frequency bands or shared frequency bands, such periodic BFD-RS and BFR-RS can be understood as a "rough" configuration method, which is likely to fail to reflect the current link condition in time. For example, in a high-frequency communication system, because the beam is narrow, the beam between the base station and the UE is easily interrupted by the environment; and for a shared frequency band (i.e. unlicensed frequency band), because of the existence of LBT mechanism, some periodic RS cannot be sent out, and the UE is likely to measure inaccurately.

[0184] In summary, in the above configuration method, because of the periodic configuration associated with the BWP, the current link communication condition cannot be reflected in time, so that the terminal device uses the periodically configured RS to measure the beam, which is likely to cause the communication beam between the terminal device and the network device to be interrupted, affecting the communication efficiency.

[0185] In order to solve the above problems, the embodiments of the present application provide a communication method and device for improving the beam measurement accuracy of the terminal device in beam failure detection and / or beam failure recovery, improving the success rate of beam measurement, and improving the communication efficiency.

[0186] Please refer to Figure 4 , the communication method provided by the embodiments of the present application comprises:

[0187] S101, the network device sends a first message to the terminal device in a non-periodic manner.

[0188] In this embodiment, the network device sends the first message to the terminal device in a non-periodic manner in step S101, and correspondingly, the terminal device receives the first message sent by the network device in a non-periodic manner in step S101.

[0189] The first message includes a first reference signal, the first reference signal includes one or more groups of beam failure detection-reference signals (BFD-RSs), and / or one or more groups of beam failure recovery-reference signals (BFR-RSs).

[0190] It should be noted that in this embodiment, one or more groups of BFD-RSs can be represented by BFD-RSs, BFD-RS set, or BFD-RS sets; one or more groups of BFR-RSs can be represented by BFR-RSs, BFR-RS set, or BFR-RS sets.

[0191] Optionally, in the first reference signal, the CSI-RS can include one or more groups of BFD-RSs and / or one or more groups of BFR-RSs. Similarly, one or more groups of CSI-RSs can be represented by CSI-RSs, CSI-RS set, or CSI-RS sets.

[0192] In a possible implementation, in the periodic CSI-RS sending manner based on the BWP, the network device can send the periodically sent CSI-RS to the terminal device at a fixed period. For example, when the period value is 10 milliseconds (ms), the network device determines the time point of the BWP value as the starting time, and sends the CSI-RS to the terminal device at 10 ms, 20 ms,..., (10K) ms after the starting time. Different from the periodic CSI-RS sending manner, in step S101, after the network device determines to send the first message to the terminal device in a non-periodic manner according to a trigger condition, the network device sends the first message to the terminal device immediately, without considering the implementation of the starting time. The trigger condition can be based on the network device itself, or based on the interaction of the terminal device. The trigger condition will be described below through specific examples:

[0193] The network device determines that the number of non-acknowledgment (NACK) information from the terminal device is greater than a first threshold; or, the network device determines that the number of listen before talk (LBT) failures is greater than a second threshold, and the network device determines to perform step S101.

[0194] Specifically, when the network device receives the number of non-acknowledgment (NACK) information from the terminal device is greater than a first threshold, or the number of LBT failures of the network device is greater than a second threshold, that is, when the network device determines that the communication quality between the network device and the terminal device is poor, the network device sends the first message to the terminal device in a non-periodic manner. The terminal device can perform beam measurement according to the first parameter to ensure the smoothness of the beam communication between the network device and the terminal device, and avoid the interruption of the communication beam between the network device and the terminal device. Optionally, the first threshold and the second threshold can be pre-configured in the network device.

[0195] Two, the network device can trigger to perform step S101 to send the first message to the terminal device in a non-periodic manner only after receiving a first request message from the terminal device for requesting the first reference signal. That is, the network device sends the first message to the terminal device in a non-periodic manner based on the request of the terminal device. The terminal device can actively request the first reference signal when determining that the beam quality is poor, which can ensure the communication quality between the terminal device and the network device. Correspondingly, for the network device, the network device can trigger to perform the process of sending the first message to the terminal device according to the first request message, without separately configuring the sending strategy of the first message, which can further save the signaling consumption of the network device. The first request message can be a scheduling request (SR) or other information.

[0196] Optionally, the terminal device determines that demodulation of the target downlink message fails in a first time period; or, the terminal device determines that the number of times of Listen Before Talk (LBT) failures is greater than a preset threshold in a second time period, i.e., the terminal device determines that the communication quality between the terminal device and the network device is poor, and sends a first request message for requesting the first reference signal to the network device. The target downlink message is carried in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) between the network device and the terminal device, and the target downlink message can be any one of downlink messages in the PDCCH or the PDSCH. Subsequently, the terminal device can perform beam measurement according to the first parameter to ensure smooth beam communication between the network device and the terminal device and avoid interruption of the communication beam therebetween. The first time period and the second time period can be a preset value, e.g., preconfigured for the terminal device or configured by the network device, which is not limited here.

[0197] In a possible implementation, before step S101, the terminal device can send the first request message to the network device through various uplink channels, including:

[0198] 1) sending the first request message to the network device through an uplink channel indicated by a control resource set corresponding to a first search space (SearchSpace1), wherein the first search space is used for searching aperiodic CSI-RS.

[0199] Specifically, the first search space can be configured in “BeamFailureRecoveryConfig”, “BWP-UplinkDedicated”, “radioLinkMonitoringConfig”, or other configuration manners, which are not described here. Corresponding to one “SearchSpaceID”, time domain configuration information of a terminal device searching a CORESET can be indicated, and the CORESET can contain a QCL relationship, and the terminal device can obtain the QCL reference in the CORESET after searching the CORESET.

[0200] Optionally, a new field of “SearchSpace1” is defined, which can correspond to one or more control resource sets (CORESETs) with QCL relationship. The “SearchSpace1” field can include configuration information for beam failure detection, obtaining aperiodic BFR-RS set, and “spatial relation” reference for reporting a beam failure event to the base station.

[0201] 2) sending a first request message to the network device through an uplink channel indicated by a control resource set associated with a second search space, wherein the second search space is configured in the periodically configured beam failure detection and / or beam failure recovery parameters.

[0202] Specifically, the second search space can be a “recovery search space” field in the DCI message.

[0203] Optionally, the “recovery search space” can be configured in the parameter “beam failure recovery configuration (BeamFailureRecoveryConfig)”. Each “recovery search space” corresponds to a CORESET, and each CORESET is configured with a transmission configuration indication (TCI-state). The TCI-state contains QCL relationship, which can be activated and released by the parameters “activation list of downlink control channel transmission configuration indication state (tci-StatesPDCCH-ToAddList)” and “release list of downlink control channel transmission configuration indication state (tci-StatesPDCCH-ToReleaseList)”. The TCI-state contains specific QCL type and RS. For example, when the parameter “transmission configuration indication in downlink control information (tci-PresentInDCI)” in the CORESET is set to “enabled”, and the reference signal indicated in the TCI activated by “tci-StatesPDCCH-ToAddList” is SS / PBCH Block with ID 2, i.e. SS / PBCH Block #2, and qcl-type1 is “typeD”. At this time, for the terminal device, the terminal device can use the downlink receiving beam for receiving the SS / PBCH Block #2 to receive the PDCCH channel where the CORESET is located.

[0204] 3) sending a first request message to the network device through an uplink channel corresponding to a supplementary uplink (SUL).

[0205] Wherein, if the terminal device supports transmission of a supplementary uplink (SUL), the first request message can be sent using the SUL.

[0206] Please refer to Figure 5 , an example of an implementation process for communication in a SUL scenario. Wherein, the network device can send relevant configuration information to the terminal device in advance through a downlink control information (DCI) message, wherein there can be multiple DCI fields in the DCI message. In the SUL scenario, the network device indicates to the terminal device whether the uplink channel used by the terminal device is sent on the SUL through the "uplink / supplementary uplink indicator (UL / SUL indicator)" field in the DCI field. For example, when the "UL / SUL indicator" is set to "1", it means that the uplink channel used to send the first request message is sent on the SUL, and the DCI format carrying the field is DCI format 0_0 or 0_1 or 0_2; optionally, when the "UL / SUL indicator" is set to "0", it means that the uplink channel used to send the first request message is not sent on the SUL.

[0207] In addition, the SUL scenario also supports a semi-statically configured SUL carrier mode, i.e., indirectly switching between non-SUL carriers and SUL carriers by switching between BWPs. If the uplink channel sent on the SUL is a PRACH or a PUCCH, the uplink transmission beam used by the PRACH channel or the PUCCH channel has the same spatial filtering characteristics (e.g., the spatial filtering characteristics can be QCL relationship, downlink / uplink beam correspondence (DL / UL beam correspondence), etc.) as the CORESET corresponding to the first search space or the second search space. Wherein, the specific implementation process of the first search space and the second search space can refer to the specific implementation of the first search space in the aforementioned 1) and the specific implementation of the second search space in 2), which will not be repeated here.

[0208] Before step S101, when the PUSCH channel used by the terminal to send the first request message is SUL, the PUSCH uses the same uplink transmission beam as the first SRS in the PUSCH, according to the downlink / uplink beam correspondence (DL / UL beam correspondence), the uplink transmission beam used by the first SRS has the same spatial filtering characteristics as the CSI-RS, SS / PBCH Block or SRS indicated in the parameter "SRS-SpatialRelationInfo". That is, the terminal can use the downlink reception beam receiving the CSI-RS or SSB information in "SRS-SpatialRelationInfo" as the uplink transmission beam of the first SRS, and the terminal can also use the uplink beam transmitting the second SRS in "SRS-SpatialRelationInfo" as the uplink transmission beam of the SRS. At this time, the uplink transmission beam of the terminal sending the PUSCH is the same as the uplink transmission beam of the first SRS. Optionally, the parameter "SRS-SpatialRelationInfo" can be carried in the RRC parameter configured by the network device to the terminal device.

[0209] In addition, in the above-mentioned various implementations of the uplink channel carrying the first request message, the uplink channel can be PUCCH, PUSCH or PRACH. Optionally, the RS indicated by the uplink channel can be associated with the RS indicated by the control resource set corresponding to the second search space. Wherein, the second search space is from the configuration of the network device to the terminal device, and the use of the RS corresponding to the RS associated with the control resource set corresponding to the second search space for sending the first request message can make the network device and the terminal device align the carrying mode of the first request message.

[0210] In a possible implementation, in step S101, the network device can send the first message to the terminal device in various ways, including:

[0211] 1) Send the first message to the terminal device through the downlink channel indicated by the control resource set corresponding to the first search space (SearchSpace1). Wherein, the first search space is used to search for aperiodic channel system information-reference signal (CSI-RS).

[0212] 2) Send the first message to the terminal device through the downlink channel indicated by the control resource set corresponding to the second search space. Wherein, the second search space is configured in the periodically configured beam failure detection and / or beam failure recovery parameter.

[0213] Specifically, the implementation process of the first search space and the second search space can refer to the implementation process of the first search space and the second search space in the aforementioned uplink channel, which will not be described here.

[0214] In a possible implementation, the first message can be a DCI (download control information) message sent by the network device to the terminal device, where a plurality of DCI fields can exist in the DCI message, and the first reference signal can be carried in different DCI fields. Specifically, the first reference signal carried in the first message can be a CSI request field in the DCI message, a BF (beam failure) detection field for beam failure detection, and / or a Candidate BF Detection field for candidate beam selection and / or beam failure detection.

[0215] When the first message is a DCI message, the first message sent by the network device to the terminal device in a non-periodic manner can further include first indication information, where the first indication information is used to indicate the beam direction of the network device sending the DCI message. For example, the beam direction can indicate that the network device uses the same beam direction to transmit and receive data, or indicates that the network device uses a plurality of beam directions to transmit and receive data, so that the terminal device can communicate with the network device according to the beam direction, and improve the system stability based on beam communication. Wherein the first indication information can be a parameter "repetition" in the CSI-RS, which is "on" or "off", to indicate the beam direction of the network device sending the DCI message.

[0216] In a possible implementation, in step S101, the network device can further include a time parameter of the first reference signal in the first message sent in a non-periodic manner, where the time parameter includes a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold for indicating a time length during which the terminal device is allowed to perform LBT. That is, the specific time parameter during which the terminal device performs measurement according to the first reference signal, so that the subsequent terminal device can perform measurement using the first reference signal according to the time parameter. Optionally, the time parameter can indicate a start time, an end time, and / or a timer, etc. Among the time parameters of the first reference signal, any time length indicated by the time parameter is less than a channel occupancy time (COT) or a maximum channel occupancy time (MCOT), so as to ensure that different terminal devices can reasonably coexist and reduce transmission collision when communicating on a shared frequency band, and further improve communication efficiency.

[0217] In addition, in step S101, the network device can further include an execution number of the first reference signal in the first message sent in a non-periodic manner, where the execution number can include a measurement number of the first reference signal and / or a number of times during which the terminal device is allowed to perform LBT, so that the subsequent terminal device can perform measurement using the first parameter according to the execution number.

[0218] In the following, a specific example will be used to describe a scenario in which the first message is a DCI message. Among the one or more groups of BFD-RS and / or the one or more groups of BFR-RS in the first reference signal (CSI-RS), different fields in the DCI can be used for carrying. In step S101, the following one or more combinations can be used to implement, including:

[0219] I. The network device carries the first reference signal (CSI-RS) in the “CSI request” field in the DCI

[0220] Specifically, when the network device triggers the terminal device to report one or more groups of CSI-RS through the “CSI request” field, the terminal device can be instructed to perform beam failure detection by default, or can be instructed to perform scanning / selection of the best downlink receiving beam, or can be instructed to perform scanning / selection of the best downlink receiving beam while performing beam failure detection, which is not limited here.

[0221] Optionally, when the first reference signal comprises a set of CSI-RS, a parameter "repetition" in the CSI-RS can be set as "on", and the network device fixes the DL transmission beam.

[0222] Optionally, when the first reference signal comprises a plurality of sets of CSI-RS, a parameter "repetition" in the CSI-RS can be set as "on", wherein each set of CSI-RS has a same quasi co-location (QCL) relationship with the PDCCH channel or the PUCCH channel. Optionally, a parameter "repetition" in the CSI-RS can be set as "off", and different CSI-RS resources in each set of CSI-RS have a same QCL relationship with the PDCCH channel or the PUCCH channel.

[0223] The QCL relationship can indicate that a large-scale parameter experienced by a reference signal / channel (RS / channel) on a certain antenna port can be derived from a RS / channel on another antenna port. The large-scale parameter includes a delay spread, an average delay, a Doppler spread, a Doppler shift, a spatial RX parameter, and the like. It should be noted that in the present embodiment and subsequent embodiments, the "QCL relationship" can also be implemented by other association relationships, for example, a DL / UL beam correspondence, which indicates that an uplink transmission beam used by the terminal device to send the PUCCH / PUSCH is the same as a downlink reception beam used by the terminal device to receive the PDCCH / PDSCH. In the present embodiment and subsequent embodiments, only the QCL relationship is taken as an example for description.

[0224] Optionally, the number of bits occupied by the "CSI request" is increased, and the bits include a time parameter and / or a number of executions reported in addition to the CSI-RS parameter configuration information used for beam failure detection, such as an L1-SINR or a reporting time parameter, a number of times of performing beam failure detection and / or candidate beam selection, and the like.

[0225] Specifically, the number of newly added bits in the "CSI request" field can be used to represent a Y1 value, Y1 representing a time length of beam detection (beam failure detection and / or beam failure recovery) performed by the terminal device using the CSI-RS, which can also be understood as a timer. Optionally, Y1 includes a time length of beam detection performed by the terminal device in addition to the time length of beam detection performed by the terminal device, and the number of bits occupied is one or more from the following set: {0, 1, …, 10} bits.

[0226] In addition, when the terminal device fails to report or the network device fails to receive the reported measurement results from the terminal device due to LBT within the time length indicated by Y1, the terminal device returns to the BFR procedure, i.e., the terminal device sends a BFR event to the upper layer of the terminal device to request triggering of the BFR procedure.

[0227] Optionally, a new bit can be further added in the "CSI request" field, which uses bits in the set {1, 2,..., 10} bits to represent the mapping relationship between the CSI-RS and the preamble / RACH-occasion, so that the terminal device can subsequently report the measurement results according to the mapping relationship.

[0228] II. Network device carries BFD-RS through "BF detection" field in DCI field

[0229] The "BF detection" field can be used to indicate one or more groups of BFD-RSs to the terminal device, and the terminal device can subsequently perform beam failure detection. Illustratively, the "BF detection" field occupies one or more bits from the following set: {0, 1, 2,..., 10} -bits.

[0230] Optionally, the network device configures and sends a group of BFD-RSs to the terminal device through the "BF detection" field, and the beam direction used by the terminal device when subsequently performing beam failure detection using the BFD-RS has the same QCL relationship with the PDCCH channel direction and the PUCCH channel received by the terminal device within a certain time period.

[0231] Optionally, when the "BF detection" field can use 1 to 4 bits, it can indicate how the terminal device detects the failed beam. For example, if the "BF detection" field has a total of 2 bits, a maximum of 4 values can be supported, and the bit "00" represents the CSI-RS ID#1, the bit "01" represents the CSI-RS ID#2, and so on. The terminal device indirectly obtains the corresponding CSI-RS ID by demodulating the "BF detection" field. Subsequently, after the terminal device performs measurement according to the first reference signal, it can report the channel system information-reference signal resource indicator (CSI-RS ID) to the network device together with the L1-RSRP, wherein the CSI-RS ID is also referred to as CRI.

[0232] III. The network device carries the BFR-RS through a newly defined "Candidate BF Detection" field in the DCI field

[0233] The newly defined "Candidate BF Detection" field can carry the BFR-RS for indicating the terminal device to perform candidate beam selection, and occupies one or more bits from the following set: {0, 1, 2, …, 10} -bits.

[0234] Optionally, when the "Candidate BF Detection" field has 1-4 bits available, it can indicate how the terminal device probes the candidate beams. For example, if the "Candidate BF Detection" field has 2 bits in total, it can support a maximum of 4 values, and the bit "00" represents CSI-RS ID#1, the bit "01" represents CSI-RS ID#2, and so on. The terminal device indirectly obtains the corresponding CSI-RS ID by demodulating the "Candidate BF Detection" field. After measuring according to the first reference signal, the terminal device can report the CSI-RS ID to the network device together with the L1-RSRP.

[0235] In a possible implementation, before the network device sends the first message in a non-periodic manner in step S101, LBT needs to be performed, and the first message is sent to the terminal device only when the network device successfully performs LBT. Thus, the success rate of sending the first message can be improved, and when the network environment is relatively busy, transmission collision can be reduced, and communication efficiency can be further improved.

[0236] In a possible implementation, in step S101, in the implementation process of the network device sending the first message to the terminal device in a non-periodic manner, the first message can include a first reference signal and an activated media access control (MAC CE), and is sent to the terminal device through a PDSCH. The activated MAC CE can indicate the time-frequency domain resource carrying the first reference signal.

[0237] Optionally, in step S101, the network device can first send the terminal device an activation MAC CE in the first message, where the activation MAC CE is used to indicate time-frequency domain resources carrying the first reference signal. In step S101, the terminal device can receive the first reference signal from the network device according to the time-frequency domain resources indicated by the activation MAC CE. This non-periodic manner can also be referred to as a semi-persistent manner. Compared with the periodic configuration manner, the measurement flexibility of the terminal device in subsequent beam failure detection and / or beam failure recovery can be improved, and the success rate of beam measurement can be improved.

[0238] In step S102, the terminal device obtains measurement results according to the first reference signal in the first message.

[0239] In this embodiment, the terminal device obtains measurement results according to the first reference signal in the first message obtained in step S101.

[0240] Specifically, in step S102, the terminal device can use the BFD-RS in the first reference signal to perform a measurement process of beam failure detection, and / or use the BFR-RS in the first reference signal to perform a measurement process of beam failure recovery, and obtain corresponding measurement results, according to the first reference signal obtained in step S101.

[0241] Optionally, in step S102, if the terminal device fails to measure according to the first reference signal, for example, when the layer 1 signal-to-interference ratio detected by the terminal device according to the BFD-RS is lower than a threshold, and / or when the layer 1 signal-to-interference ratio detected by the terminal device according to the BFR-RS is lower than a threshold, the terminal device can use a reference signal sent by the network device in a periodic manner to perform a BFR mechanism. Figure 3

[0242] In step S103, the terminal device sends the network device the measurement results.

[0243] In this embodiment, the terminal device sends the network device the measurement results obtained in step S102.

[0244] In a possible implementation, in step S102, the terminal device performs measurement according to one or more groups of CSI-RS resources configured by the network device in step S101, and compares the measurement results with preset thresholds to obtain measurement results. In step S103, the terminal device sends the network device the measurement results.

[0245] ​For example, if the terminal device sets the number of reference signals (nrofReportedRS) in the channel system message configuration report (CSI-ReportConfig) in the preset high-level parameter to "1", the terminal device will use 7-bits to feed back the corresponding L1-RSRP quantization value in the range of [-140, -44] decibels (dB) with 1 dB as a step in step S102 to perform measurement and obtain measurement results.

[0246] In addition, if the terminal device sets the number of reference signals (nrofReportedRS) in the CSI-ReportConfig in the preset high-level parameter to be greater than "1", or sets the parameter "group-based beam reporting (groupBasedBeamReporting)" to "enabled", after the terminal device performs measurement and obtains measurement results in step S102, the terminal device uses the reporting mode of differential L1-RSRP to report in step S103, in which the terminal device uses 7-bits to report the quantized L1-RSRP measurement result value with 1 dB as a step, and also includes the difference of the measurement value of the strongest L1-RSRP measurement result value using 4-bits with 2 dB as a step. Optionally, the terminal device can report the CRI together.

[0247] Optionally, the terminal device can use the implementation process of the periodically configured reference signal associated with the BWP to send the measurement results to the network device in step S103.

[0248] In the embodiment, the network device sends a first message for carrying a first reference signal to the terminal device in a non-periodic manner, wherein the first reference signal includes BFD-RS and / or BFR-RS, so that the terminal device can perform beam failure detection and / or beam failure recovery according to the first reference signal. Compared with the periodic configuration manner, the beam measurement accuracy of the terminal device in performing beam failure detection and / or beam failure recovery can be improved, and the success rate of beam measurement can be improved, thereby avoiding the interruption of the communication beam between the terminal device and the network device, and improving the communication efficiency.

[0249] Figure 4 In the embodiment, the first message sent by the network device to the terminal device in a non-periodic manner includes a first reference signal, wherein the first reference signal includes BFD-RS and / or BFR-RS. In the following, the network device is taken as a base station and the terminal device is taken as a UE as an example, and the implementation process is introduced. Figures 6 to 12 The embodiment introduces the implementation process.

[0250] Please refer toFigure 6 The embodiment of the application provides another communication method, comprising:

[0251] S201, the UE sends a beam failure event to the base station.

[0252] The reasons for triggering the UE to send the beam failure event to the base station in step S201 mainly include the following two cases:

[0253] 1) From the perspective of the base station, in a certain period of time: the base station detects that the number of non-acknowledgment information NACK fed back by the UE exceeds a threshold; the base station fails LBT for a plurality of times, and exceeds a preset threshold.

[0254] 2) From the perspective of the UE, in a certain period of time: the UE cannot successfully demodulate information in the PDCCH or the physical downlink shared channel PDSCH; or, in the period of time, if there is uplink service transmission, the UE fails LBT for a plurality of times, and exceeds a preset threshold.

[0255] In a possible implementation, when the UE reports the beam failure event in step S201, the content reported by the UE can be a scheduling request (SR) or other information, and the number of occupied bits is one or more of the following set: {0, 1, 2}-bits.

[0256] The uplink channel used by the UE to report the beam failure event to the base station can include:

[0257] 1) The uplink channel in a quasi-co-location QCL relationship with the “recoverySearchSpace”.

[0258] Optionally, the “recoverySearchSpace” is configured in the parameter “BeamFailureRecoveryConfig”. Each “recoverySearchSpace” corresponds to a control resource set CORESET, and each CORESET is configured with a transmission configuration indication TCI-state. The TCI-state contains a QCL relationship, and the activation and release are realized through the parameters “tci-StatesPDCCH-ToAddList” and “tci-StatesPDCCH-ToReleaseList”. The TCI-state contains a specific QCL type and RS.

[0259] For example, when the parameter “tci-PresentInDCI” within the CORESET is set to “enabled” and the reference signal indicated in the activated TCI state in “tci-StatesPDCCH-ToAddList” is SS / PBCH Block with ID 2, i.e., SS / PBCH Block#2, and qcl-type1 is “typeD”, the UE can use the downlink receive beam used to receive SS / PBCH Block#2 to receive the PDCCH channel of the CORESET by default.

[0260] Optionally, there are three uplink channels that the UE can use to report the beam failure event, which are physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) and PRACH.

[0261] Among them, the UE can use the PUCCH channel that has a QCL relationship. In the PUCCH, there is a parameter “PUCCH-SpatialRelationInfo”, which has the same filtering characteristics as the SS / PBCH Block, CSI-RS and SRS contained therein. Assuming that the RS configured by the parameter “PUCCH-SpatialRelationInfo” in the PUCCH is SS / PBCH Block#3, it means that the UE can use the downlink receive beam used to receive SS / PBCH Block#3 as the uplink transmit beam used to transmit PUCCH by using channel reciprocity.

[0262] Alternatively, the UE can also use the PUSCH channel that has a QCL relationship. The PUSCH is often transmitted together with the SRS. The configuration parameter of the SRS contains “SRS-SpatialRelationInfo”, which is similar to the parameter “PUCCH-SpatialRelationInfo” in the PUCCH channel. The UE can transmit SRS by using channel reciprocity. If the PUSCH channel contains SRS, the PUSCH and SRS will use the same uplink transmit beam. If not, or the PUSCH is scheduled by DCI format 0_0, the uplink transmit beam used by the PUSCH is either the same as the lowest ID PUCCH resource on the currently activated BWP, or the downlink receive beam of the lowest ID CORESET is used to be the uplink transmit beam by using channel reciprocity.

[0263] Alternatively, the UE can also use the PRACH channel, and the uplink transmission beam used by the PRACH channel is the channel reciprocity with the reception beam of the SS / PBCH Block with the strongest L-RSRP in the initial access process.

[0264] In a possible implementation, the three uplink channels selected by the UE satisfy the following conditions: the RS indicated by the parameter "Spatial Relation" in the channel is the same as the RS indicated by the TCI parameter in the CORESET corresponding to "recoverySearchSpace".

[0265] 2) A new "SearchSpace1" is defined, which corresponds to one or more CORESETs that have a QCL relationship. This search space is used to monitor the configuration information of beam failure detection, obtain the configuration information of the aperiodic BFR-RS set, and report the "Spatial Relation" reference of the beam failure event to the base station. The uplink channel used by the UE to report the beam failure event can also use one or more of PUSCH, PUCCH and PRACH, and the implementation process is similar to that in 1), which will not be described here.

[0266] 3) If the UE supports the transmission of the supplementary uplink SUL, it is transmitted using the SUL. The channels on the SUL link can also support PUSCH, PUCCH and PRACH, and the implementation process is similar to that in 1) and 2), which will not be described here.

[0267] S202, the base station sends BFD-RS to the UE.

[0268] S203, the UE judges whether it has received it, if so, step S204 is performed, if not, step S205 is performed.

[0269] It should be noted that in the present embodiment, one or more groups of BFD-RSs can be represented by BFD-RSs, BFD-RS set or BFD-RS sets. Among them, the CSI-RS can include one or more groups of BFD-RSs. Similarly, one or more groups of CSI-RSs can be represented by CSI-RSs, CSI-RS set or CSI-RS sets.

[0270] In steps S202 and S203, the base station sends one or more groups of CSI-RS sets to the UE, and the CSI-RS set contains one or more CSI-RS resources, which are used for beam failure detection in the present embodiment.

[0271] In one possible implementation, the base station places the aperiodic configuration information of the BFD-RS set in the DCI and sends it through the PDCCH channel, which has a QCL relationship with "recoverySearchSpace" or "SearchSpace1", such as using the same downlink transmission beam direction as the CORESET corresponding to "recoverySearchSpace" or "SearchSpace1", and the UE also uses the downlink reception beam receiving the "recoverySearchSpace" or "SearchSpace1" corresponding CORESET to receive the PDCCH channel carrying the aperiodic BFD-RS set configuration information.

[0272] 1) The base station triggers the UE to report a set of BFD-RSs (CSI-RS set) through the DCI field "CSI request".

[0273] Among them, set the parameter "repetition" in the CSI-RS set to "on", the base station fixes the DL transmission beam, and thereafter, the UE defaults to be used for beam failure detection; or, the UE performs beam failure detection while scanning / selecting the best DL Rx beam.

[0274] Optionally, increase the number of bits occupied by "CSI request", and the bits include reporting information such as L1-SINR or reporting time information in addition to indicating the CSI-RS set parameter configuration information for beam failure detection.

[0275] 2) The base station triggers the UE to report multiple sets of BFD-RSs (CSI-RS set) through the DCI field "CSI request".

[0276] Among them, set the parameter "repetition" in the CSI-RS set to "on", each set of CSI-RS set has the same QCL relationship with the PDCCH channel or the PUCCH channel, and the UE side behavior also supports one of Alt1 and Alt2 in 1).

[0277] Or, set the parameter "repetition" in the CSI-RS set to "off", and each set of CSI-RS set has the same QCL relationship with the PDCCH channel or the PUCCH channel, and the UE side behavior also supports one of Alt1 and Alt2 in 1).

[0278] Optionally, the number of bits occupied by the "CSI request" is increased, and in addition to indicating the CSI-RS set parameter configuration information for beam failure detection, the bits also include reporting information such as L1-SINR or reporting time information.

[0279] 3) A new DCI field 1, such as "BF detection", is defined to send a group or multiple groups of BFD-RSs to the UE, instructing the UE to perform beam failure detection, and the number of bits occupied is one or more of the following set: {0, 1, 2, …, 10} bits.

[0280] Among them, the base station configures and sends a group of BFD-RSs to the UE, and the direction of the BFD-RSs has the same QCL relationship with the direction of the PDCCH channel and the PUCCH channel received by the UE in a certain period of time. When a CSI-RS set is triggered by DCI, the bits in "CSI request" or "BF detection" are used to indicate the Y1 value, indicating the time for the UE to perform beam failure detection, which can also be understood as a timer. Optionally, in addition to containing the time for the UE to perform beam failure detection, the Y1 value also includes the time for the UE to report, and the total number of bits occupied is one or more of the following set: {0, 1, …, 10} bits. The schematic diagram is as follows Figure 7 .

[0281] S204, the UE performs measurement on the specified BFD-RS.

[0282] S205, the UE returns to the BFR process.

[0283] In steps S204 and S205, when the UE cannot report or the gNB does not receive the reported measurement result information from the UE within Y1 time due to LBT, it returns to the BFR process. That is, the UE sends a BFR event to the high layer of the UE, requesting to trigger Figure 3 the BFR process shown.

[0284] In addition, the implementation process of steps S204 and S205 can refer to the implementation process of steps S102 and S103 in the foregoing embodiments, which will not be described here.

[0285] Figure 6 The embodiment shown proposes a method of performing beam failure detection based on aperiodic BFD-RS, which improves the accuracy of the UE performing beam detection.

[0286] Among them, Figure 6The embodiments shown include at least the following benefits: adding aperiodic CSI-RSs (i.e., BFD-RSs) for beam failure detection; defining a new "SearchSpace1" for searching aperiodic BFD-RSs, and its corresponding CORESET providing a spatial relation reference for the related uplink channel; defining a new DCI field (such as "BFdetection") for triggering aperiodic CSI-RSs for beam failure detection; increasing the number of bits occupied by "CSI request", and using the additional bits to represent configuration information (i.e., Y1 value) of BFD-RS set setting and UE execution time and / or reporting time for beam failure detection in the BFR procedure; and defining a new "BF detection" using information (i.e., Y1 value) of UE execution time and / or reporting time for beam failure detection.

[0287] Referring to Figure 8 The embodiments of the present application provide another communication method, including:

[0288] S301, the UE sends a beam failure event to the base station.

[0289] In step S301, the UE sends a confirmation of the occurrence of the beam failure detection event to the base station through an uplink channel, and the transmission beam direction of the uplink channel has channel reciprocity or the same RS as the "spatial relation" of the respective CORESETs of "recoverySearchSpace" and / or "SearchSpace1". The uplink channel that can be supported can be one or more of PUSCH, PUCCH, and PRACH, and the implementation process and Figure 6 The configuration mode of step S201 in the first embodiment is similar, and will not be described here.

[0290] The content reported by the UE can be SR or other information, and the number of bits occupied is one or more of the following set: {0, 1, 2}-bits.

[0291] If the UE supports SUL transmission, PUSCH, PUCCH, and PRACH can be transmitted through the SUL channel. The schematic diagram is shown in Figure 7 .

[0292] S302, the base station sends a BFR-RS to the UE.

[0293] S303, the UE determines whether it has received the BFR-RS, and if so, step S304 is performed, and if not, step S305 is performed.

[0294] It should be noted that in the present embodiment, one or more groups of BFR-RSs can be represented by BFR-RSs, BFR-RS set, or BFR-RS sets. Among them, the CSI-RS can include one or more groups of BFR-RSs. Similarly, one or more groups of CSI-RSs can be represented by CSI-RSs, CSI-RS set, or CSI-RS sets.

[0295] In steps S302 and S303, the base station sends one or more groups of CSI-RS sets (BFR-RS sets) to the UE, which can send BFR-RS resources through one of the following two DCI fields:

[0296] 1) Multiplexing "CSI request" field, at this time the UE can report the candidate beams on the following two types of channels:

[0297] a) If the UE reports the candidate beams using PRACH,

[0298] Optionally, the uplink transmission beam used by the PRACH channel is the receiving beam that has channel reciprocity with the receiving L-RSRP strongest SS / PBCH Block in the initial access process.

[0299] Optionally, new bits can be added to the "CSI request" field, and bits in the set {{1, 2, …, 10} bits} are used to represent the mapping relationship between CSI-RS and preamble / RACH-occasion. For the base station, when receiving the preamble sent by the UE through the PRACH channel, the CSI-RS ID associated with the preamble index can be obtained, and the candidate beam can be obtained accordingly. For example, when receiving part of the bit "0001" in the "CSI request" field, it means that the CSI-RS ID #1 corresponds to the Preamble index #1. When receiving part of the bit "0001" in the "CSI request" field, it means that the CSI-RS ID #1 corresponds to the Preamble index #1.

[0300] In addition, the relationship between CSI-RS and preamble / RACH-occasion can be indicated by the parameter "ra-OccasionList", and new other parameters can also be redefined, such as "CSIRS-Occasion". The number of bits that can be used is one or more {0, 1, 2, …, 10} bits in the parameter;

[0301] Optionally, when the UE reports the candidate beam using PRACH, the RRC will be re-established, i.e. the parameters in the high layer RRC layer on the UE side will be changed.

[0302] b) the UE reports the candidate beam using PUSCH / PUCCH,

[0303] Optionally, the UE reports the confirmation information through PUCCH / PUSCH with the same "spatial relation" relationship as the respective "recoverySearchSpace" and / or "SearchSpace1" corresponding CORESET. The reporting information can be a 1-bit ACK (explicit) or specific uplink data traffic (implicit).

[0304] 2) A new DCI field, such as "Candidate BF Detection", is defined to indicate the UE to perform candidate beam selection, occupying one or more bits from the following set: {0, 1, 2, …, 10} -bits.

[0305] a) The UE reports the candidate beam using PRACH, and the implementation process is similar to a) in 1), which will not be repeated here.

[0306] b) The UE reports the candidate beam using PUSCH / PUCCH, and the implementation process is similar to b) in 1), which will not be repeated here.

[0307] The base station sends a group or multiple groups of aperiodic CSI-RS resources configured by the PDCCH channel to the UE, and the beam used by the PDCCH channel or the corresponding CORESET-1 in the PDCCH has the same QCL relationship as the "recoverySearchSpace" corresponding CORESET-2. The UE performs corresponding operations according to the parameter "repetition" in the CSI-RS set.

[0308] The base station can use one DCI to trigger one or more groups of CSI-RS sets to instruct the UE to perform candidate beam selection, or use multiple DCIs to trigger one or more groups of CSI-RS sets to instruct the UE to perform candidate beam selection.

[0309] In one possible implementation, two groups of CSI-RS sets are triggered by one DCI:

[0310] When the parameter "repetition" is set to "on", the base station fixes the downlink transmission beam, and the UE adjusts the downlink reception beam; when the parameter "repetition" in the set is set to "off", the UE selectively fixes the reception beam or adjusts the reception beam at the same time.

[0311] Specifically, if using the “CSI request” field. The bits in this field indicate the measurement time and / or reporting time information in addition to the BFR-RSs for candidate beam selection:

[0312] Alt1: The base station configures Y1, Y2 and Y3 respectively, which represent the beam measurement time and reporting time respectively. Y1 and Y2 represent the beam measurement time respectively, and Y3 represents the reporting time.

[0313] Alt2: The base station configures a value Y4, which is greater than or equal to the sum of Y1+Y2+Y3.

[0314] Exemplarily, Figure 9 It can be indicated that the UE is instructed to measure and report the candidate beams by the “CSI request”. In this Figure 9 example, when the configuration mode is Alt2, that is, the base station only configures the value of Y4, which contains the measurement time and reporting time. When the configuration mode is Alt1, in this example, Y1 and Y2 represent the measurement duration of the UE respectively, and Y3 represents the duration.

[0315] In addition, if a newly defined DCI field such as “Candidate BF Detection” is used. The bits in this field indicate the measurement time and / or reporting time information in addition to the BFR-RSs for candidate beam selection:

[0316] Alt1: The base station configures the candidate beam selection measurement time and reporting time information respectively.

[0317] Optionally: The base station configures Y1, Y2 and Y3 respectively, which represent the beam measurement time and reporting time respectively. Y1 and Y2 represent the beam measurement time respectively, and Y3 represents the reporting time.

[0318] Optionally: The base station configures a value Y4, which is greater than or equal to the sum of Y1+Y2+Y3.

[0319] Alt2: The base station configures the candidate beam selection measurement time.

[0320] Optionally: The base station configures Y1 and Y2 respectively, which represent the beam measurement time respectively.

[0321] Optionally: The base station configures a value Y4, which is greater than or equal to the sum of Y1+Y2.

[0322] Exemplarily, Figure 10It can be indicated that the UE measures the candidate beam in the case indicated by the newly defined DCI field "Candidate BF Detection". In this Figure 10 In the example, Y1 and Y2 respectively represent the measurement duration of the UE. In Y1 time, when the base station sets the parameter "repetition" in the CSI-RS set to "on", the base station fixes the downlink transmission beam, and the UE adjusts the downlink reception beam. In Y2 time, when the base station sets the parameter "repetition" in the CSI-RS set to "off", the base station adjusts the downlink transmission beam, and at this time, the UE can fix the downlink reception beam, or can adjust the downlink reception beam together.

[0323] S304, the UE performs measurement on the specified BFR-RS;

[0324] S305, the UE returns to the BFR process.

[0325] The implementation process of steps S304 and S305 can refer to the implementation process of steps S102 and S103 in the foregoing embodiments, which will not be described here.

[0326] Figure 8 The embodiment shown proposes a method of performing candidate beam selection based on aperiodic BFR-RS. Through this method, the accuracy of the UE performing candidate beam detection is improved.

[0327] In the embodiment shown, Figure 8 The embodiment shown includes at least the following beneficial effects: adding aperiodic CSI-RS (i.e. BFR-RS set) for candidate beam selection; defining a new DCI field (such as "Candidate BF Detection") to trigger aperiodic CSI-RS for candidate beam selection; increasing the number of bits occupied by "CSI request", and the additional bits are used to indicate the BFR-RS set parameter setting and the UE execution candidate beam selection time and / or reporting time configuration; increase the number of bits occupied by "CSI request" or define or increase bits in the parameter "Candidate BF Detection" to indicate the relationship between CSI-RS and preamble / RO; the newly defined "Candidate BF Detection" uses information containing the UE execution candidate beam selection time and / or reporting time.

[0328] Please refer to Figure 11 The embodiment of the present application provides another communication method, which comprises:

[0329] S401, the UE sends a beam failure event to the base station;

[0330] In step S401, the UE triggers the base station to send the cause of the beam failure event and Figure 6 The causes mentioned in step 1) in the embodiment shown are the same. The reporting uses the transmission beam direction of the uplink channel and the "spatial relation" of the "recoverySearchSpace" and / or "SearchSpace1" corresponding CORESETs have channel reciprocity or the same RS. The supported uplink channel can be one or more of PUSCH, PUCCH and PRACH. The related discussion and configuration parameters and Figure 6 The configuration method of step 1) in the embodiment shown is the same.

[0331] Optionally, the UE reporting content can be SR or other information, occupying one or more bits from the following set: {0, 1, 2} -bits. If the UE supports SUL transmission, PUSCH, PUCCH and PRACH can be uploaded through the SUL channel.

[0332] S402, the base station sends BFD-RS and BFR-RS to the UE;

[0333] S403, the UE determines whether it has received, if yes, step S404 is performed, if not, step S405 is performed;

[0334] It should be noted that in the embodiment, one or more groups of BFD-RSs can be represented by BFD-RSs, BFD-RS set or BFD-RS sets; one or more groups of BFR-RSs can be represented by BFR-RSs, BFR-RS set or BFR-RS sets. In addition, the CSI-RS can include one or more groups of BFD-RSs and / or one or more groups of BFR-RSs. Similarly, one or more groups of CSI-RSs can be represented by CSI-RSs, CSI-RS set or CSI-RS sets.

[0335] In steps S402 and S403, the base station sends one or more groups of CSI-RSs to the UE, which contains BFD-RSs and BFR-RSs.

[0336] The base station sends the aperiodic CSI-RS configuration information through the PDCCH channel, and the beam direction of the channel is QCL with the RSs in the CORESET corresponding to "recoverySearchSpace" or "SearchSpace1". The DCI field used can be multiplexed with "CSI request", or a new DCI field 1, such as "BF Detection and Selection", can be used, occupying one or more bits from the following set: {0, 1, 2, …, 10} -bits.

[0337] For the case of multiplexing "CSI request", the method is similar to step 2) in Embodiment 2, i.e., the UE and the base station perform corresponding beam operations according to the parameter "repetition" in the CSI-RS set. Optionally, the number of bits of the parameter can be increased to represent the time information of UE measurement and reporting and the mapping relationship between CSI-RS and preamble / RO. If the base station uses a new DCI field 1, the field contains not only an indication for the UE to perform corresponding beam operations, but also time information of UE measurement and / or reporting and the mapping relationship between CSI-RS and preamble / RO, and the method is similar to step 2) in Embodiment 2. Correspondingly, the time configuration mode for UE measurement and reporting can refer to the processes shown in Figure 9 and Figure 10 , which will not be described here.

[0338] The base station triggers one or more groups of "CSI-RS sets" through PDCCH with QCL relationship with the CORESET corresponding to "recoverySearchSpace"; the UE performs corresponding beam scanning according to the parameter "repetition" in the CSI-RS set.

[0339] 1) For the case of the base station triggering multiple groups of "CSI-RS sets", taking the triggering of two groups of CSI-RS sets as an example:

[0340] Specifically, if the parameter "repetition" in the CSI-RS set is set to "on", the base station fixes the downlink transmission beam, and the UE performs one of the following operations:

[0341] Alt 1: Perform beam scanning in the failed direction of the downlink transmission beam for candidate downlink reception beam selection;

[0342] Alt 2: Default beam failure detection.

[0343] In addition, if the parameter "repetition" in the CSI-RS set is set to "off", the UE performs one of the following operations:

[0344] Alt 1: fixed downlink receive beam;

[0345] Alt 2: simultaneously adjust the downlink receive beam;

[0346] Alt 3: default beam failure detection.

[0347] When the UE fails to report or the base station fails to receive the reported measurement result information from the UE due to LBT failure within a time period, the UE returns to the BFR process.

[0348] In addition, it should be noted that in this embodiment, the UE only supports candidate beam reporting after the measurement is completed.

[0349] S404, the UE performs measurement on the specified BFD-RS and BFR-RS;

[0350] S405, the UE returns to the BFR process.

[0351] The implementation process of steps S404 and S405 can refer to the implementation process of steps S102 and S103 in the foregoing embodiments, which will not be repeated here.

[0352] Figure 11 The embodiment shown proposes a method of performing beam failure detection and candidate beam selection based on aperiodic CSI-RSs, which improves the measurement accuracy of the UE. Among them, Figure 11 The embodiment shown includes at least the following beneficial effects: new aperiodic CSI-RSs for beam failure detection and candidate beam selection; the newly defined "SearchSpace1" is used to search for aperiodic CSI-RSs, and the corresponding CORESET provides the "spatial relation" reference of the related uplink channel; a new DCI field (such as "BF Detection and Selection") is defined to trigger the UE to perform beam failure detection and candidate beam selection of aperiodic CSI-RSs; increase the number of bits occupied by "CSI request", and the additional bits are used to indicate: BFD-RS resource and BFR-RS resource setting, UE execution beam failure detection and candidate beam selection time and / or reporting time configuration and indication of the relationship between CSI-RS and preamble / RO, etc.

[0353] Please refer to Figure 12 The embodiment of the present application provides another communication method, which includes:

[0354] S501, the UE performs LBT;

[0355] S502, the UE determines whether the LBT successfully occupies the channel, if yes, step S503 is performed, if not, step S504 is performed;

[0356] For a system working in a shared frequency band, the transmitter needs to perform LBT mechanism before sending any information, and can only use the channel after confirming that the occupied channel is idle.

[0357] In Figure 6 , Figure 8 , Figure 11 In the embodiment shown in the figure,

[0358] In a possible implementation, the UE as a transmitter needs to:

[0359] 1) report a beam failure event or confirmation information of the beam failure event;

[0360] 2) report the selected best candidate beam information.

[0361] In 1), when the UE reports the beam failure event or the confirmation information of the beam failure event, because LBT needs to be performed, when the number of times or the time of LBT performed by the UE exceeds a preset threshold, the UE will fall back to the BFR process.

[0362] It should be noted that when the UE reports the confirmation information of the beam failure event (i.e. Figure 8 In the corresponding embodiment, the base station sends a group or multiple groups of CSI-RS resource to indicate the UE candidate beam measurement, and also configures related time information, such as the reporting time information. The configured reporting time information needs to include the time information of tolerating LBT failure of the UE, such as the aforementioned time information Y4 in the corresponding embodiment of 1), and the value of Y4 can also include the time Y5 of LBT performed by the UE. At this time, when Y4 exceeds the preset time threshold Y0, the UE will spontaneously fall back to the BFR process. Figure 8

[0363] In 2), the base station has configured the time information of the UE measurement, so it also supports the base station to configure the time information Y6 of tolerating LBT failure of the UE at the same time, and the time configuration information method is similar to that in 1), which will not be repeated here.

[0364] In a possible implementation, when the base station as a transmitter, the base station needs to perform LBT before sending the PDCCH channel carrying the CSI-RS resource.

[0365] ​At this time, after the UE reports the beam failure event or the confirmation information of the beam failure event, if the UE fails to receive the non-periodic CSI-RS resource configured by the base station within a preset second time threshold, one or part or all of the following three operations will be performed:

[0366] Alt 1: Randomly back off for a period of time, and resend the beam failure event or the confirmation information of the beam failure event;

[0367] Alt 2: Increase the transmission power, and resend the beam failure event or the confirmation information of the beam failure event;

[0368] Alt 3: Return to the BFR process.

[0369] In addition, in order to ensure the reasonable coexistence of different access devices on the shared frequency band, the NRU system defines the concepts of channel occupancy time (COT) and maximum channel occupancy time (MCOT), which respectively represent the occupancy time length of the transmitter under different LBT types for information transmission and the maximum allowable occupancy time length for information transmission. The COT length occupied by the transmitter when transmitting signals is related to the priority of channel access, and the specific information is shown in Table 1.

[0370]

[0371] Table 1

[0372] For the system working on the shared frequency band, the related measurement, reporting and backoff time configuration assumptions are as follows:

[0373] Define Y11, which represents the measurement time information and reporting information configured by the base station to the UE, and the time corresponding to the number of times or times that the UE tolerates LBT failure;

[0374] For the case of "random backoff for a period of time" of the UE, define Y12, which represents the "backoff" time and Y11.

[0375] The values of Y11 and Y12 satisfy one of the following two conditions:

[0376] Alt1: Less than the MCOT length;

[0377] Alt2: Less than the remaining COT length.

[0378] For Alt2, the UE acquires the remaining COT information by demodulating the DCI (such as DCI 2_0) scrambled by system frame indicator-radio-network temporary identifier (SFI-RNTI) and performing cyclic redundancy check (CRC) on the DCI.

[0379] S503, the UE performs measurement on the specified BFD-RS and BFR-RS.

[0380] S504, the UE returns to the BFR procedure.

[0381] The implementation process of steps S503 and S504 can refer to the implementation process of steps S102 and S103 in the foregoing embodiments, which will not be described here.

[0382] Figure 12 The embodiments have at least the following improvements: the impact of LBT failure on the design and performance of the system is considered; the introduction of COT / MCOT limits the time domain behavior of the related base station and UE. In combination with the LBT mechanism, a non-periodic beam failure detection and candidate beam selection procedure is designed for a system operating in a shared frequency band.

[0383] In addition, in the embodiments Figure 12 In the embodiments, at least the following beneficial effects are included: non-periodic CSI-RSs are added for beam failure detection and candidate beam selection; a newly defined “SearchSpace1” is used to search for non-periodic CSI-RSs, and the corresponding CORESET provides a “spatial relation” reference for the related uplink channel; a new DCI field is defined to trigger the non-periodic CSI-RS for beam failure detection in the BFR procedure; the number of bits occupied by “CSI request” is increased, and the additional bits are used to indicate the configuration information of the non-periodic CSI-RS setting, the time for the UE to perform beam failure detection and / or report, the relationship between the CSI-RS and the preamble / RO, and the time for the UE to tolerate LBT failure; the impact of LBT failure on the design and performance of the system is considered. In addition, the introduction of COT / MCOT limits the time domain behavior of the related base station and UE.

[0384] The embodiments of the present application are described above from the perspective of methods, and the communication device in the embodiments of the present application is introduced from the perspective of specific device implementation.

[0385] Please refer to Figure 13The embodiment of the present application provides a communication device 1300, which comprises a transceiver unit 1301 and a processing unit 1302.

[0386] The transceiver unit 1301 is configured to send a first message to a terminal device in a non-periodic manner, wherein the first message comprises a first reference signal, and the first reference signal comprises a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS).

[0387] The transceiver unit 1301 is further configured to receive a measurement result of the terminal device.

[0388] In a possible implementation, the first message comprises a downlink control information (DCI) message.

[0389] The first reference signal is carried in a channel system information request (CSI request) field in the DCI message; and / or

[0390] The first reference signal is carried in a beam failure detection (BF detection) field in the DCI message for beam failure detection; and / or

[0391] The first reference signal is carried in a candidate beam failure detection (Candidate BF Detection) field in the DCI message for candidate beam selection and / or beam failure detection.

[0392] In a possible implementation, the first message further comprises first indication information, and the first indication information is used to indicate a beam direction of the network device for sending the DCI message.

[0393] In a possible implementation, the transceiver unit 1301 sends the first message to the terminal device through at least one downlink channel, and the at least one downlink channel comprises:

[0394] A downlink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used for searching a non-periodic channel system information-reference signal (CSI-RS); or

[0395] A downlink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in a periodically configured beam failure detection and / or beam failure recovery parameter.

[0396] In a possible implementation, the first message further comprises a time parameter of the first reference signal, and the time parameter comprises a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold, wherein the first time length threshold is used to indicate a time length for allowing the terminal device to perform listen before talk (LBT).

[0397] In a possible implementation, the time length indicated by the time parameter is less than a maximum channel occupancy time (MCOT) or a remaining channel occupancy time (COT).

[0398] In a possible implementation, the first message further includes a measurement number of the first reference signal and / or a number of times that the terminal device is allowed to perform the LBT.

[0399] In a possible implementation, before the transceiver 1301 sends the first message to the terminal device, the apparatus further includes a processing unit 1302.

[0400] The processing unit 1302 is configured to determine that a number of non-acknowledgement information (NACK) from the terminal device is greater than a first threshold; and / or,

[0401] The processing unit 1302 is configured to determine that a number of failures of listen before talk (LBT) is greater than a second threshold.

[0402] In a possible implementation, when it is determined that the LBT is successful, the transceiver 1301 sends the first message to the terminal device.

[0403] In a possible implementation, the first message includes a medium access control (MAC) control element (CE).

[0404] In a possible implementation, before the transceiver 1301 sends the first message to the terminal device, the transceiver 1301 is further configured to receive a first request message from the terminal device, where the first request message is used to request the first reference signal.

[0405] In a possible implementation, the transceiver 1301 receives the first request message from the terminal device through at least one uplink channel, including:

[0406] an uplink channel indicated by a control resource set corresponding to a first search space, where the first search space is used to search for an aperiodic CSI-RS; or,

[0407] an uplink channel indicated by a control resource set corresponding to a second search space, where the second search space is configured in a periodically configured beam failure detection and / or beam failure recovery parameter; or,

[0408] an uplink channel corresponding to a supplementary uplink (SUL).

[0409] In a possible implementation, the at least one uplink channel is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH), and the reference signal (RS) indicated by the at least one uplink channel is associated with the RS indicated by the control resource set corresponding to the second search space.

[0410] It should be noted that the information execution process and the like of the units of the communication apparatus 1300 described above can be specifically refer to the descriptions in the foregoing method embodiments of the present application, and will not be described here again.

[0411] Please refer to Figure 14 The communication apparatus 1400 provided in the embodiments of the present application comprises a transceiver unit 1401 and a processing unit 1402.

[0412] The transceiver unit 1401 is configured to receive a first message sent by a network device in a non-periodic manner, wherein the first message comprises a first reference signal, and the first reference signal comprises a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS).

[0413] The transceiver unit 1401 is further configured to obtain a measurement result according to the first reference signal and send the measurement result to the network device.

[0414] In a possible implementation, the first message comprises a downlink control information (DCI) message.

[0415] The first reference signal is carried in a channel system information request (CSI request) field in the DCI message; and / or,

[0416] The first reference signal is carried in a beam failure detection (BFdetection) field for beam failure detection in the DCI message; and / or,

[0417] The first reference signal is carried in a candidate beam failure detection (Candidate BF Detection) field for candidate beam selection and / or beam failure detection in the DCI message.

[0418] In a possible implementation, the first message further comprises first indication information, and the first indication information is used to indicate a beam direction of the network device sending the DCI message.

[0419] In a possible implementation, the transceiver unit 1401 receives the first message sent by the network device in a non-periodic manner through at least one of the following downlink channels, comprising:

[0420] an uplink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used for searching aperiodic channel system information-reference signal (CSI-RS); or

[0421] a downlink channel indicated by a control resource set corresponding to a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

[0422] In a possible implementation, the first message further includes a time parameter of the first reference signal, the time parameter including a measurement time parameter and / or a time parameter for reporting a measurement result and / or a first time length threshold, wherein the first time length threshold is used to indicate a time length allowing the terminal device to perform LBT.

[0423] In a possible implementation, the time length indicated by the time parameter is less than a maximum channel occupancy time (MCOT) or a remaining channel occupancy time (COT).

[0424] In a possible implementation, the first message further includes a measurement number of the first reference signal and / or a number of times allowing the terminal device to perform the LBT.

[0425] In a possible implementation, before the transceiver 1401 receives the first message from the network device, the transceiver 1401 is further configured to send a first request message to the network device, the first request message being used to request the first reference signal.

[0426] In a possible implementation, the apparatus further includes a processing unit 1402, and the transceiver 1401 is configured to send the first request message to the network device when at least one of the following conditions is met, including:

[0427] the processing unit 1402 determines that demodulation of a target downlink message fails within a first time period, the target downlink message being carried in a physical downlink control channel (PDCCH) or a physical downlink shared channel (PDSCH) between the network device and the terminal device;

[0428] or

[0429] the processing unit 1402 determines that a number of times of LBT failure within a second time period is greater than a preset threshold.

[0430] In a possible implementation, the transceiver 1401 sends the first request message to the network device through at least one of the following uplink channels, including:

[0431] an uplink channel indicated by a control resource set corresponding to a first search space, wherein the first search space is used for searching aperiodic CSI-RS; or

[0432] an uplink channel indicated by a control resource set associated with the second search space, wherein the second search space is configured in a periodically configured beam failure recovery parameter; or

[0433] an uplink channel corresponding to a supplementary uplink (SUL).

[0434] In a possible implementation, the at least one uplink channel is a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or a physical random access channel (PRACH), and a reference signal (RS) indicated by the at least one uplink channel is associated with an RS indicated by a control resource set corresponding to the second search space.

[0435] In a possible implementation, the first message includes a medium access control control element (MAC-CE).

[0436] It should be noted that the information execution process and the like of the units of the communication apparatus 1400 described above can be specifically refer to the descriptions in the foregoing method embodiments of the present application, and will not be described here.

[0437] Please refer to Figure 15 The foregoing structure of the communication apparatus involved in the embodiments of the present application is shown in the structure diagram of the communication apparatus provided by the embodiments of the present application, and the communication apparatus can be specifically the network device in the foregoing embodiments. The structure of the communication apparatus can refer to the structure shown in Figure 15 .

[0438] The communication apparatus includes at least one processor 1511, at least one memory 1512, at least one transceiver 1513, at least one network interface 1514, and one or more antennas 1515. The processor 1511, the memory 1512, the transceiver 1513, and the network interface 1514 are connected, for example, through a bus. In the embodiments of the present application, the connection can include various interfaces, transmission lines, or buses, etc., and the present embodiment does not limit them. The antenna 1515 is connected to the transceiver 1513. The network interface 1514 is configured to enable the communication apparatus to be connected to other communication devices through a communication link. For example, the network interface 1514 can include a network interface between the communication apparatus and the core network device, such as an S1 interface. The network interface can include a network interface between the communication apparatus and other network devices (such as other access network devices or core network devices), such as an X2 or Xn interface.

[0439] The processor 1511 is mainly used for processing communication protocols and communication data, and controlling the whole communication device, executing software programs, processing data of the software programs, such as for supporting the communication device to perform the actions described in the embodiments. The communication device can include a baseband processor and a central processor, the baseband processor is mainly used for processing communication protocols and communication data, and the central processor is mainly used for controlling the whole terminal device, executing software programs, and processing data of the software programs. Figure 15 The processor 1511 in the terminal device can integrate the functions of the baseband processor and the central processor, and those skilled in the art can understand that the baseband processor and the central processor can also be independent processors interconnected by a bus or the like. Those skilled in the art can understand that the terminal device can include multiple baseband processors to adapt to different network modes, and the terminal device can include multiple central processors to enhance its processing capability, and various components of the terminal device can be connected by various buses. The baseband processor can also be referred to as a baseband processing circuit or a baseband processing chip. The central processor can also be referred to as a central processing circuit or a central processing chip. The function of processing communication protocols and communication data can be built into the processor, or stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function.

[0440] The memory is mainly used for storing software programs and data. The memory 1512 can exist independently and be connected to the processor 1511. Alternatively, the memory 1512 can be integrated with the processor 1511, for example, integrated in a chip. The memory 1512 can store program codes for executing the technical solutions of the embodiments of the present application, and the processor 1511 controls the execution. Various computer programs executed can also be regarded as a driver of the processor 1511.

[0441] Figure 15 Only one memory and one processor are shown. In actual terminal devices, multiple processors and multiple memories can exist. The memory can also be referred to as a storage medium or a storage device, etc. The memory can be a storage element on the same chip as the processor, i.e. an on-chip storage element, or an independent storage element, and the embodiments of the present application do not limit this.

[0442] The transceiver 1513 can be configured to support the receiving or transmitting of radio frequency signals between the communication device and a terminal. The transceiver 1513 can be connected to the antenna 1515. The transceiver 1513 includes a transmitter Tx and a receiver Rx. Specifically, the one or more antennas 1515 can receive radio frequency signals, the receiver Rx of the transceiver 1513 is configured to receive the radio frequency signals from the antenna and convert the radio frequency signals into digital baseband signals or digital intermediate frequency signals, and provide the digital baseband signals or digital intermediate frequency signals to the processor 1511 for further processing, such as demodulation and decoding, by the processor 1511. In addition, the transmitter Tx of the transceiver 1513 is also configured to receive modulated digital baseband signals or digital intermediate frequency signals from the processor 1511, and convert the modulated digital baseband signals or digital intermediate frequency signals into radio frequency signals, and transmit the radio frequency signals through the one or more antennas 1515. Specifically, the receiver Rx can selectively perform one or more levels of down-mixing and analog-to-digital conversion to obtain the digital baseband signals or digital intermediate frequency signals, and the order of the down-mixing and analog-to-digital conversion can be adjustable. The transmitter Tx can selectively perform one or more levels of up-mixing and digital-to-analog conversion to obtain the radio frequency signals, and the order of the up-mixing and digital-to-analog conversion can be adjustable. The digital baseband signals and the digital intermediate frequency signals can be collectively referred to as digital signals.

[0443] The transceiver can also be referred to as a transceiving unit, a transceiver, a transceiving device, etc. Optionally, the devices in the transceiving unit for implementing the receiving function can be regarded as a receiving unit, and the devices in the transceiving unit for implementing the transmitting function can be regarded as a transmitting unit, i.e., the transceiving unit includes the receiving unit and the transmitting unit. The receiving unit can also be referred to as a receiver, an input port, a receiving circuit, etc. The transmitting unit can be referred to as a transmitter, a transmitter, or a transmitting circuit, etc.

[0444] It should be noted that, Figure 15 The communication device shown can be specifically configured to implement Figures 5 to 13 The steps implemented by the access network device in the corresponding method embodiment, and achieve the corresponding technical effects of the access network device, Figure 15 The specific implementation of the communication device shown can be referred to Figures 5 to 13 The description in the corresponding various method embodiments, which will not be repeated here.

[0445] Please refer to Figure 16A possible logical structure of the communication apparatus 1600 involved in the above-described embodiments provided in the embodiments of the present application, which can be specifically a terminal device in the foregoing embodiments, can include but is not limited to a processor 1601, a communication port 1602, a memory 1603, and a bus 1604. In the embodiments of the present application, the processor 1601 is configured to control and process actions of the communication apparatus 1600.

[0446] Further, the processor 1601 can be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It can implement or execute the various exemplary logical blocks, modules, and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and the like. For the convenience and brevity of description, the specific working processes of the above-described system, apparatus, and unit can be referred to the corresponding processes in the foregoing method embodiments, which will not be described herein.

[0447] It should be noted that, Figure 16 The communication apparatus shown can be specifically used to implement Figures 5 to 13 the steps implemented by the terminal device in the corresponding method embodiments, and achieve the corresponding technical effects of the terminal device, Figure 16 the specific implementation of the communication apparatus shown can be referred to Figures 5 to 13 the description in the corresponding method embodiments, which will not be described herein.

[0448] The embodiments of the present application also provide a computer readable storage medium storing one or more computer execution instructions, when the computer execution instructions are executed by a processor, the processor executes the method described in the possible implementation manner of the communication apparatus as described in the foregoing embodiments, wherein the communication apparatus can be specifically a network device in the foregoing embodiments.

[0449] The embodiments of the present application also provide a computer readable storage medium storing one or more computer execution instructions, when the computer execution instructions are executed by a processor, the processor executes the method described in the possible implementation manner of the communication apparatus as described in the foregoing embodiments, wherein the communication apparatus can be specifically a terminal device in the foregoing embodiments.

[0450] The embodiments of the present application also provide a computer program product (or computer program) storing one or more computer, when the computer program product is executed by the processor, the processor executes the method of the possible implementation manner of the communication apparatus as described above, wherein the communication apparatus can be specifically a network device in the foregoing embodiments.

[0451] The embodiment of the present application further provides a computer program product for storing one or more computers, when the computer program product is executed by the processor, the processor executes the method of the possible implementation manners of the communication device, wherein the communication device can be the terminal device in the foregoing embodiment.

[0452] The embodiment of the present application further provides a chip system, which comprises a processor, and is used for supporting the communication device to implement the functions involved in the possible implementation manners of the communication device. In a possible design, the chip system can further comprise a memory, and the memory is used for storing necessary program instructions and data of the communication device. The chip system can be composed of a chip, or can comprise the chip and other discrete devices, and the communication device can be the network device in the foregoing embodiment.

[0453] The embodiment of the present application further provides a chip system, which comprises a processor, and is used for supporting the communication device to implement the functions involved in the possible implementation manners of the communication device. In a possible design, the chip system can further comprise a memory, and the memory is used for storing necessary program instructions and data of the communication device. The chip system can be composed of a chip, or can comprise the chip and other discrete devices, and the communication device can be the terminal device in the foregoing embodiment.

[0454] The embodiment of the present application further provides a network system architecture, which comprises the communication device, and the communication device can be the terminal device and the network device in the foregoing embodiment.

[0455] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented by other manners. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0456] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment.

[0457] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0458] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application, essentially or in the form of a contribution to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk.

Claims

1. A communication method, characterized in that, include: The network device sends a first message to the terminal device in an aperiodic manner. The first message includes a first reference signal, which includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS). The first message is triggered based on any of the following: the number of non-acknowledgment (NACK) messages from the terminal device is greater than a first threshold, or the number of LBT (Listen Before Talk) failures is greater than a second threshold. The network device receives the measurement results from the terminal device.

2. The method according to claim 1, characterized in that, The first message is carried on at least one of the following downlink channels: Associated with the downlink channel indicated by the control resource set corresponding to the first search space, wherein the first search space is used to search for aperiodic Channel System Information-Reference Signal (CSI-RS); or, The downlink channel is associated with a set of control resources in a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

3. The method according to claim 1 or 2, characterized in that, When the network device determines that LBT is successful, the network device sends a first message to the terminal device.

4. The method according to claim 1 or 2, characterized in that, The first message includes Downlink Control Information (DCI) messages; The first reference signal carries the channel system information request in the DCI message. CSI request Fields; and / or, The first reference signal is carried in the DCI message for beamforming detection used in beam failure detection. BF detection Fields; And / or, The first reference signal is carried in the DCI message for candidate beamforming detection used for candidate beam selection and / or beam failure detection. Candidate BF Detection Field.

5. The method according to claim 4, characterized in that, The first message also includes first indication information, which is used to indicate the beam direction in which the network device sends the DCI message.

6. The method according to claim 1 or 2, characterized in that, The first message is carried on at least one of the following channels: Associated with the downlink channel indicated by the control resource set corresponding to the first search space, wherein the first search space is used to search for aperiodic Channel System Information-Reference Signal (CSI-RS); or, The downlink channel is associated with a set of control resources in a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

7. The method according to claim 1 or 2, characterized in that, The first message also includes time parameters of the first reference signal, the time parameters including measurement time parameters and / or time parameters for reporting measurement results and / or a first duration threshold, wherein the first duration threshold is used to indicate the duration during which the terminal device is allowed to perform Listen-Before-Speak (LBT).

8. The method according to claim 7, characterized in that, The duration indicated by the time parameter is less than the maximum channel occupancy time (MCOT) or the remaining channel occupancy time (COT).

9. The method according to claim 1 or 2, characterized in that, The first message also includes the number of times the first reference signal was measured and / or the number of times the terminal device is allowed to perform the LBT.

10. The method according to claim 1 or 2, characterized in that, The first message includes the MAC CE control unit that activates media access control.

11. A communication method, characterized in that, include: The terminal device receives a first message sent by the network device in an aperiodic manner. The first message includes a first reference signal, which includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS). The first message is triggered based on any of the following: the number of non-acknowledgment (NACK) messages from the terminal device is greater than a first threshold, or the number of LBT (Listen Before Talk) failures is greater than a second threshold. The terminal device acquires the measurement result based on the first reference signal and sends it to the network device.

12. The method according to claim 11, characterized in that, The first message includes Downlink Control Information (DCI) messages; The first reference signal carries the channel system information request in the DCI message. CSI request Fields; and / or, The first reference signal is carried in the DCI message for beamforming detection used in beam failure detection. BF detection Fields; And / or, The first reference signal is carried in the DCI message for candidate beamforming detection used for candidate beam selection and / or beam failure detection. Candidate BF Detection Field.

13. The method according to claim 12, characterized in that, The first message also includes first indication information, which is used to indicate the beam direction in which the network device sends the DCI message.

14. The method according to any one of claims 11 to 13, characterized in that, The first message is carried on at least one of the following downlink channels: Associated with the downlink channel indicated by the control resource set corresponding to the first search space, wherein the first search space is used to search for aperiodic Channel System Information-Reference Signal (CSI-RS); or, The downlink channel is associated with a set of control resources in a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

15. The method according to any one of claims 11 to 13, characterized in that, The first message also includes time parameters of the first reference signal, the time parameters including measurement time parameters and / or time parameters for reporting measurement results and / or a first duration threshold, wherein the first duration threshold is used to indicate the duration during which the terminal device is allowed to perform Listen-Before-Speak (LBT).

16. The method according to claim 15, characterized in that, The duration indicated by the time parameter is less than the maximum channel occupancy time (MCOT) or the remaining channel occupancy time (COT).

17. The method according to any one of claims 11 to 13, characterized in that, The first message also includes the number of times the first reference signal was measured and / or the number of times the terminal device is allowed to perform the LBT.

18. The method according to any one of claims 11 to 13, characterized in that, The first message includes the MAC CE control unit that activates media access control.

19. A communication device, characterized in that, Includes transceiver units: The transceiver unit is used to send a first message to the terminal device in an aperiodic manner. The first message includes a first reference signal, which includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS). The first message is triggered based on any of the following: the number of non-acknowledgment (NACK) messages from the terminal device is greater than a first threshold, or the number of LBT (Listen Before Talk) failures is greater than a second threshold. The transceiver unit is also used to receive the measurement results from the terminal device.

20. The apparatus according to claim 19, characterized in that, The transceiver unit sends a first message to the terminal device through at least one of the following downlink channels, including: Associated with the downlink channel indicated by the control resource set corresponding to the first search space, wherein the first search space is used to search for aperiodic Channel System Information-Reference Signal (CSI-RS); or, The downlink channel is associated with a set of control resources in a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

21. The apparatus according to claim 19 or 20, characterized in that, Upon confirming that LBT is successful, the transceiver unit sends a first message to the terminal device.

22. The apparatus according to claim 19 or 20, characterized in that, The first message includes Downlink Control Information (DCI) messages; The first reference signal is carried in the Channel System Information Request (CSI) field of the DCI message; and / or, The first reference signal is carried in the beamforming detection (BFdetection) field of the DCI message for beam failure detection; And / or, The first reference signal is carried in the Candidate BF Detection field of the DCI message, which is used for candidate beam selection and / or beam failure detection.

23. The apparatus according to claim 22, characterized in that, The first message also includes first indication information, which is used to indicate the beam direction of the network device when sending the DCI message.

24. The apparatus according to claim 19 or 20, characterized in that, The first message is carried on at least one of the following channels: Associated with the downlink channel indicated by the control resource set corresponding to the first search space, wherein the first search space is used to search for aperiodic Channel System Information-Reference Signal (CSI-RS); or, The downlink channel is associated with a set of control resources in a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

25. The apparatus according to claim 19 or 20, characterized in that, The first message also includes time parameters of the first reference signal, the time parameters including measurement time parameters and / or time parameters for reporting measurement results and / or a first duration threshold, wherein the first duration threshold is used to indicate the duration during which the terminal device is allowed to perform Listen-Before-Speak (LBT).

26. The apparatus according to claim 25, characterized in that, The duration indicated by the time parameter is less than the maximum channel occupancy time (MCOT) or the remaining channel occupancy time (COT).

27. The apparatus according to claim 19 or 20, characterized in that, The first message also includes the number of times the first reference signal was measured and / or the number of times the terminal device is allowed to perform the LBT.

28. The apparatus according to claim 19 or 20, characterized in that, The first message includes the MAC CE control unit that activates media access control.

29. A communication device, characterized in that, Includes transceiver units; The transceiver unit is configured to receive a first message sent by a network device in an aperiodic manner. The first message includes a first reference signal, which includes a beam failure detection-reference signal (BFD-RS) and / or a beam failure recovery-reference signal (BFR-RS). The first message is triggered based on any of the following: the number of non-acknowledgment (NACK) messages from the terminal device is greater than a first threshold, or the number of LBT (Listen Before Talk) failures is greater than a second threshold. The transceiver unit is further configured to acquire measurement results based on the first reference signal and send them to the network device.

30. The apparatus according to claim 29, characterized in that, The first message includes Downlink Control Information (DCI) messages; The first reference signal carries the channel system information request in the DCI message. CSI request Fields; and / or, The first reference signal is carried in the DCI message for beamforming detection used in beam failure detection. BF detection Fields; And / or, The first reference signal is carried in the DCI message for candidate beamforming detection used for candidate beam selection and / or beam failure detection. Candidate BF Detection Field.

31. The apparatus according to claim 30, characterized in that, The first message also includes first indication information, which is used to instruct the network device to use the beam direction for sending the DCI message.

32. The apparatus according to any one of claims 29 to 31, characterized in that, The first message is carried on at least one of the following downlink channels: Associated with the downlink channel indicated by the control resource set corresponding to the first search space, wherein the first search space is used to search for aperiodic Channel System Information-Reference Signal (CSI-RS); or, The downlink channel is associated with a set of control resources in a second search space, wherein the second search space is configured in periodically configured beam failure detection and / or beam failure recovery parameters.

33. The apparatus according to any one of claims 29 to 31, characterized in that, The first message also includes time parameters of the first reference signal, the time parameters including measurement time parameters and / or time parameters for reporting measurement results and / or a first duration threshold, wherein the first duration threshold is used to indicate the duration during which the terminal device is allowed to perform Listen-Before-Speak (LBT).

34. The apparatus according to claim 33, characterized in that, The duration indicated by the time parameter is less than the maximum channel occupancy time (MCOT) or the remaining channel occupancy time (COT).

35. The apparatus according to any one of claims 29 to 31, characterized in that, The first message also includes the number of times the first reference signal was measured and / or the number of times the terminal device is allowed to perform the LBT.

36. The apparatus according to any one of claims 29 to 31, characterized in that, The first message includes the MAC CE control unit that activates media access control.

37. A computer program product, the computer program product comprising a computer program or instructions, characterized in that, When the computer program product is run on a computer, it causes the computer to perform the method as described in any one of claims 1 to 10, or causes the computer to perform the method as described in any one of claims 11 to 18.

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