CN115707010A

CN115707010A - Communication method and device

Info

Publication number: CN115707010A
Application number: CN202110902702.9A
Authority: CN
Inventors: 顾志方; 娄崇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2023-02-17
Also published as: WO2023011165A1

Abstract

A communication method and a device are used for respectively monitoring a plurality of TRPs in a multi-TRP transmission scene through a wireless link. The first access network equipment sends the wireless link monitoring configuration information of the first TRP and the wireless link monitoring configuration information of the second TRP to the terminal equipment, so that the terminal equipment monitors a service cell according to the wireless link monitoring configuration information of the first TRP and monitors a first cell according to the wireless link monitoring configuration information of the second TRP; the first access network device is an access network device for managing wireless resources of a serving cell, the first TRP is an antenna or an antenna panel of the first access network device, and the second TRP corresponds to the first cell. Therefore, the terminal equipment can respectively perform radio link monitoring on the cells corresponding to the plurality of TRPs in the multi-TRP scene, so that the terminal equipment can perform targeted operation when RLF occurs to different cells subsequently, and data transmission is guaranteed.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.

Background

The fifth generation (5th generation, 5g) communication system may support Multiple Input Multiple Output (MIMO) with a number of antennas of 16, 32, 64, or 128 antennas, and MIMO in 5G may be referred to as massive MIMO. The massive MIMO technology needs beam management, and performs communication through a beam direction with good communication quality. In a high-frequency communication scene, a beam is more easily blocked by obstacles such as an automobile or a human body, and beam failure and even radio link failure are caused. To solve the above problem, multiple Transmission Reception Point (TRP) nodes (mTRP) may cooperate to maintain a reliable connection. In addition, a plurality of TRPs serve the terminal equipment together, so that the transmission capacity can be increased, and the experience of cell edge users is improved.

Disclosure of Invention

The application provides a communication method and device, which are used for respectively monitoring a plurality of transmission position (TRP) in a TRP transmission scene.

In a first aspect, the present application provides a communication method, which is applied to a scenario of TRP transmission at multiple transmission receiving points, and the method may be applied to a terminal device, a processor, a chip, or a functional module in the terminal device, and the like. The method can comprise the following steps: receiving radio link monitoring configuration information of a first TRP and radio link monitoring configuration information of a second TRP from first access network equipment; performing wireless link monitoring on a service cell according to the wireless link monitoring configuration information of the first TRP, and performing wireless link monitoring on the first cell according to the wireless link monitoring configuration information of the second TRP; the first access network device is an access network device that manages radio resources of the serving cell, the first TRP is an antenna or an antenna panel of the first access network device, the second TRP corresponds to the first cell, physical Cell Identities (PCIs) of the serving cell and the first cell are different, and the terminal device communicates with the first TRP and the second TRP.

By the method, the terminal device can respectively perform radio link monitoring on the cells corresponding to the plurality of TRPs in the multi-TRP scene, so that the terminal device can perform targeted operation when Radio Link Failure (RLF) occurs to different cells subsequently, and data transmission is guaranteed.

In one possible design, when it is determined that the serving cell does not generate RLF and the first cell generates RLF, a first message is sent to the first access network device, where the first message is used to notify the first cell that RLF occurs. Therefore, data transmission of the serving cell can be guaranteed, and meanwhile, data transmission of the first cell can be transferred to the serving cell to guarantee transmission of data in the original first cell.

In one possible design, the first message includes one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of RLF occurring in the first cell, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

In one possible design, when it is determined that the serving cell does not generate RLF and the first cell generates RLF, the method further includes: performing a first operation, wherein the first operation may include any one or more of: deactivating the first cell (or the second TRP); releasing resources occupied by the first cell (or the second TRP); deleting configuration information of the first cell (or the second TRP); not monitoring (or monitoring) a Physical Downlink Control Channel (PDCCH) of the first cell (or the second TRP); for the beam failure of the first cell, if the candidate beam available for the first cell is not identified, not sending a beam failure recovery request; performing Radio Link Monitoring (RLM) on the first cell (or the second TRP), and determining whether a radio link of the first cell (or the second TRP) is restored; not RLM the first cell (or the second TRP); alternatively, the transmission of a fourth TRP is increased and/or activated, the third TRP comprising the fourth TRP. Uplink transmission load can be reduced when the terminal device does not send the beam failure recovery request; performing RLM on the first cell through the terminal equipment, judging whether the radio link of the first cell is recovered or not, and timely recovering the data transmission of the first cell when the radio link of the first cell is recovered; and the terminal equipment increases and/or activates the transmission of the fourth TRP, so that the terminal equipment can communicate with the fourth TRP to ensure data transmission.

In one possible design, when the transmission of the fourth TRP is added and/or activated, a notification message may also be sent to the first access network device, the notification message notifying that the transmission of the fourth TRP has been added and/or activated. This may enable the first access network device to determine that the terminal device is establishing communication with the fourth TRP.

In one possible design, the first operation performed is also included in the first message. Therefore, the first access network equipment can adjust the corresponding configuration according to the operation of the terminal equipment.

In one possible design, a first response message is received from the first access network device, the first response message being used in response to the first message, the first response message including one or more of the following indication information: information indicating that a terminal device deactivated the first cell (or the second TRP); information instructing the terminal device to release resources occupied by the first cell (or the second TRP); information instructing a terminal device to delete the configuration information of the first cell (or the second TRP); or, information instructing the terminal device to increase and/or activate transmission of a fourth TRP; wherein the third TRP comprises the fourth TRP, and the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP. Therefore, the terminal equipment can execute corresponding operation according to the indication of the first access network equipment.

In a possible design, when the first response message includes information indicating that the terminal device deactivates the first cell, the first response message may further include a first duration and/or a second duration, where the first duration is a duration for deactivating the first cell, and the second duration is a duration between a time when the first response message is received and a starting time for deactivating the first cell; when the first response message includes information indicating that the terminal device releases the resource occupied by the first cell, the first response message may further include a third duration, where the third duration is a duration from a time when the first response message is received to a starting time when the terminal device releases the resource occupied by the first cell. In this way, the terminal device may continue RLM for the secondary cell for the first duration and/or the second duration, or the terminal device may RLM for the secondary cell until the secondary cell is released to determine whether the radio link of the first cell is recovered.

In one possible design, when it is determined that the radio link of the first cell is recovered, a first recovery message may be further sent to the first access network device, where the first recovery message is used to notify that the radio link of the first cell is recovered. So that the data transmission of the first cell can be resumed later.

In one possible design, the first recovery message may include one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of radio link recovery, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

In one possible design, one or more of the following operations are performed: activating the first cell (or the second TRP); requesting an increase in transmission of the second TRP to the first access network device; resuming monitoring of the PDCCH of the first cell (or the second TRP); requesting an increase in transmission of the second TRP to the first access network device; recovering the RLM procedure of the first cell (or the second TRP); or, a beam failure recovery request procedure to recover the first cell. This may resume data transmission of the first cell and the second TRP.

In one possible design, a first recovery response message is received from the first access network device, the first recovery response message being used in response to the first recovery message, and the first recovery response message may include one or more of the following indication information: information indicating successful receipt of the first recovery message; information indicating activation of the first cell (or the second TRP); configuration information indicating the first cell (or the second TRP); or, information indicating an increase in the second TRP transmission. Therefore, the terminal equipment can execute corresponding recovery operation according to the indication of the first access network equipment.

In one possible design, when it is determined that RLF occurs in the serving cell and the first cell does not have RLF, a second message is sent to a second access network device, where the second message is used to notify that RLF occurs in the serving cell, and the second access network device is an access network device that manages radio resources of the first cell. Therefore, data transmission of the first cell can be guaranteed, and meanwhile, data transmission of the serving cell can be transferred to the first cell, so that data transmission in the original serving cell is guaranteed.

In one possible design, the second message includes one or more of the following information: an identity of the serving cell, an identity of the first TRP, a PCI of the serving cell, a cause of RLF occurring in the serving cell, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

In one possible design, when it is determined that RLF occurs in the serving cell and RLF does not occur in the first cell, the method further includes: performing a second operation, the second operation comprising any one or more of: deactivating the serving cell (or the first TRP); releasing resources occupied by the serving cell (or the first TRP); deleting configuration information of the serving cell (or the first TRP); not monitoring the PDCCH of the serving cell (or the first TRP); for the beam failure of the serving cell, if the candidate beam available to the serving cell is not identified, not sending a beam failure recovery request; performing RLM on the serving cell (or the first TRP), and judging whether a radio link of the serving cell (or the first TRP) is recovered; not RLM the serving cell (or first TRP); or switching to a second cell, and using the second cell as a serving cell, where the second cell is the first cell or a first neighboring cell, and a PCI of the first neighboring cell is different from PCIs of the serving cell and the first cell. Uplink transmission load can be reduced when the terminal device does not send the beam failure recovery request; RLM is carried out on the service cell through the terminal equipment, whether the wireless link of the service cell is recovered or not is judged, and data transmission of the service cell can be recovered in time when the wireless link of the service cell is recovered; the terminal equipment is switched to the second cell, and the second cell is taken as a service cell, so that the cell serving the terminal equipment can be ensured to exist.

In one possible design, the second operation performed is also included in the second message. Therefore, the first access network equipment can adjust the corresponding configuration according to the operation of the terminal equipment.

In one possible design, a second response message is received from the second access network device, the second response message being used in response to the second message, the second response message including one or more of the following indication information: information indicating successful receipt of the second message; information instructing a terminal device to deactivate the serving cell (or first TRP); information instructing the terminal device to release resources occupied by the serving cell (or first TRP); information instructing a terminal device to delete configuration information of the serving cell (or first TRP); or, information indicating that the terminal device is switched to a second cell; the second cell is the first cell or a first neighboring cell, and the PCI of the first neighboring cell is different from the PCI of the serving cell and the PCI of the first cell. This enables the terminal device to perform corresponding operations according to the indication of the first access network device.

In a possible design, when the second response message includes information indicating that the terminal device deactivates the serving cell, the second response message further includes a fourth duration and/or a fifth duration, the fourth duration is a duration for deactivating the serving cell, and the fifth duration is a duration from a time when the second response message is received to a starting time for deactivating the serving cell; when the second response message includes information indicating that the terminal device releases the resource occupied by the serving cell, the second response message further includes a sixth duration, where the sixth duration is a duration from a time when the second response message is received to a starting time when the terminal device releases the resource occupied by the serving cell. In this way, the terminal device may continue to perform RLM on the serving cell for the third duration and/or the fourth duration, or the terminal device may perform RLM on the serving cell until the serving cell is released, so as to determine whether the radio link of the serving cell is recovered.

In one possible design, when it is determined that the radio link of the serving cell is recovered, a second recovery message may be further sent to the first access network device or the second access network device, where the second recovery message is used to notify that the radio link of the serving cell is recovered. So that the data transmission of the original serving cell can be resumed later.

In one possible design, the second recovery message includes one or more of the following information: an identity of the serving cell, an identity of the first TRP, a PCI of the serving cell, a cause of radio link recovery, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

In one possible design, one or more of the following operations are performed: activating a serving cell (or a first TRP); resuming monitoring of the PDCCH of the serving cell (or the first TRP); requesting an increase in transmission of the first TRP to the first access network device or the second access network device; the terminal equipment requests configuration information of a serving cell (or a first TRP) from the first access network equipment or the second access network equipment; an RLM procedure in which a terminal device recovers a serving cell (or a first TRP); or, a beam failure recovery request procedure to recover the serving cell. This may restore the data transmission of the serving cell and the first TRP.

In one possible design, a second recovery response message is received from the first access network device or the second access network device, the second recovery response message being used in response to the second recovery message, the second recovery message including one or more of the following indication information: information indicating successful receipt of the second recovery message; information indicating activation of a serving cell (or a first TRP); configuration information indicating a serving cell (or a first TRP); or, information indicating an increase in first TRP transmission. Therefore, the terminal equipment can execute corresponding recovery operation according to the indication of the first access network equipment or the second access network equipment.

In one possible design, radio link restoration decision configuration information is received from the first access network device, where the radio link restoration decision configuration information includes one or more of: the physical layer link synchronization threshold used for judging the RLF recovery, the physical layer link desynchronization threshold used for judging the RLF recovery, the timer information used for judging the RLF recovery, the counter information used for judging the RLF recovery, or the synchronization times used for judging the RLF recovery. So that the terminal device can determine whether the radio link of the cell in which the RLF occurs is recovered.

In a second aspect, the present application provides a communication method, which is applied to a scenario of multiple transmission reception points TRP transmission, and the method may be applied to a first access network device, a processor, a chip, or a functional module in the first access network device, and the like. The method can comprise the following steps: generating wireless link monitoring configuration information of a first TRP and wireless link monitoring configuration information of a second TRP, and sending the wireless link monitoring configuration information of the first TRP and the wireless link monitoring configuration information of the second TRP to terminal equipment; the first TRP is an antenna or an antenna panel of the first access network device, the first access network device is an access network device for managing radio resources of a serving cell, the second TRP corresponds to the first cell, PCIs of the serving cell and the first cell are different, and the terminal device communicates with the first TRP and the second TRP.

By the method, the terminal equipment can respectively monitor the radio links of the cells corresponding to the TRPs in the multi-TRP scene, so that the terminal equipment can perform targeted operation when RLF occurs to different cells subsequently, and data transmission is guaranteed.

In one possible design, a first message is received from the terminal device, where the first message is used to notify the first cell that RLF occurs. Therefore, data transmission of the serving cell can be guaranteed, and meanwhile, data transmission of the first cell can be transferred to the serving cell to guarantee transmission of data in the original first cell.

In one possible design, the first message may include one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of RLF occurring in the first cell, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

In one possible design, the first message further includes a first operation performed by the terminal device. Thus, the first access network device can adjust the corresponding configuration according to the operation of the terminal device.

In one possible design, the first operation performed by the terminal device may include one or more of: deactivating the first cell (or the second TRP); releasing resources occupied by the first cell (or the second TRP); deleting configuration information of the first cell (or the second TRP); not monitoring (or monitoring) the PDCCH of the first cell (or the second TRP); for the beam failure of the first cell, if the candidate beam available for the first cell is not identified, not sending a beam failure recovery request; performing RLM on the first cell (or the second TRP), and judging whether a radio link of the first cell (or the second TRP) is recovered; not RLM the first cell (or the second TRP); alternatively, the transmission of a fourth TRP is increased and/or activated, said third TRP comprising said fourth TRP. Uplink transmission load can be reduced when the terminal device does not send the beam failure recovery request; performing RLM on the first cell through the terminal equipment, judging whether the radio link of the first cell is recovered or not, and timely recovering the data transmission of the first cell when the radio link of the first cell is recovered; and the terminal equipment increases and/or activates the transmission of the fourth TRP, so that the terminal equipment can communicate with the fourth TRP to ensure data transmission.

In one possible design, a notification message is received from the terminal device, the notification message notifying that the transmission of the fourth TRP has been increased and/or activated. This may enable the first access network device to determine that the terminal device is establishing communication with the fourth TRP.

In one possible design, a first response message is sent to the terminal device, the first response message is used for responding to the first message, and the first response message includes one or more of the following indication information: information indicating that a terminal device deactivated the first cell (or the second TRP); information instructing the terminal device to release resources occupied by the first cell (or the second TRP); information instructing a terminal device to delete the configuration information of the first cell (or the second TRP); or, information instructing the terminal device to increase and/or activate transmission of a fourth TRP; wherein the third TRP comprises the fourth TRP, and the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP. Therefore, the terminal equipment can execute corresponding operation according to the indication of the first access network equipment.

In a possible design, when the first response message includes information indicating that the terminal device deactivates the first cell, the first response message may further include a first duration and/or a second duration, where the first duration is a duration for deactivating the first cell, and the second duration is a duration from a time when the first response message is received to a starting time for deactivating the first cell; when the first response message includes information indicating that the terminal device releases the resource occupied by the first cell, the first response message may further include a third duration, where the third duration is a duration from a time when the first response message is received to a starting time when the terminal device releases the resource occupied by the first cell. In this way, the terminal device may continue to perform RLM on the secondary cell for the first duration and/or the second duration, or perform RLM on the secondary cell until the secondary cell is released, to determine whether the radio link of the first cell is recovered.

In one possible design, a first recovery message is received from the terminal device, the first recovery message notifying that the radio link of the first cell is recovered. So that the data transmission of the first cell can be resumed later.

In one possible design, the first recovery message includes one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of radio link recovery, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

In one possible design, a first recovery response message is sent to the terminal device, where the first recovery response message is used for responding to the first recovery message, and the first recovery response message may include one or more of the following indication information: information indicating successful receipt of the first recovery message; information indicating activation of the first cell (or the second TRP); configuration information indicating the first cell (or the second TRP); or, information indicating an increase in the second TRP transmission. Therefore, the terminal equipment can execute corresponding recovery operation according to the indication of the first access network equipment.

In one possible design, the radio link restoration determination configuration information is sent to the terminal device, and the radio link restoration determination configuration information includes one or more of the following: the physical layer link synchronization threshold used for judging the RLF recovery, the physical layer link desynchronization threshold used for judging the RLF recovery, the timer information used for judging the RLF recovery, the counter information used for judging the RLF recovery, or the synchronization times used for judging the RLF recovery. So that the terminal device can determine whether the radio link of the cell in which the RLF occurs is recovered.

In a third aspect, the present application further provides a communication apparatus, which may be a terminal device, and which has a function of implementing the method in the first aspect or each possible design example of the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.

In one possible design, the structure of the communication device includes a transceiver unit and a processing unit, and these units may perform corresponding functions in the first aspect or each possible design example of the first aspect, for which specific reference is made to detailed descriptions in method examples, which are not described herein again.

In one possible design, the communication apparatus includes a transceiver and a processor, and optionally a memory, in its structure, the transceiver is configured to transmit and receive data and to perform communication interaction with other devices in the communication system, and the processor is configured to support the communication apparatus to perform corresponding functions in the first aspect or each possible design example of the first aspect. The memory is coupled to the processor and holds the program instructions and data necessary for the communication device.

In a fourth aspect, the present application further provides a communication apparatus, which may be a first access network device, and which has a function of implementing the method in the second aspect or each possible design example of the second aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.

In a possible design, the structure of the communication apparatus includes a transceiver unit and a processing unit, and these units may perform corresponding functions in the second aspect or each possible design example of the second aspect, which specifically refers to the detailed description in the method example, and is not described herein again.

In one possible design, the communication apparatus includes a transceiver and a processor, and optionally a memory, in its structure, the transceiver is configured to transmit and receive data and to perform communication interaction with other devices in the communication system, and the processor is configured to support the communication apparatus to perform corresponding functions in the second aspect or each possible design example of the second aspect. The memory is coupled to the processor and holds the program instructions and data necessary for the communication device.

In a fifth aspect, an embodiment of the present application provides a communication system, which may include the above-mentioned terminal device, first access network device, second access network device, and the like.

In a sixth aspect, a computer-readable storage medium is provided in an embodiment of the present application, where the computer-readable storage medium stores program instructions that, when executed on a computer, cause the computer to perform the method described in the first aspect and any possible design thereof, or the second aspect and any possible design thereof. By way of example, computer readable storage media may be any available media that can be accessed by a computer. Take this as an example but not limiting: a computer-readable medium may include a non-transitory computer-readable medium, a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a CD-ROM or other optical disk storage, a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

In a seventh aspect, an embodiment of the present application provides a computer program product including computer program code or instructions, which when run on a computer, causes the computer to implement the method described in the first aspect or any one of the possible designs of the first aspect, or any one of the possible designs of the second aspect or the second aspect.

In an eighth aspect, the present application further provides a chip, including a processor, coupled with a memory, and configured to read and execute program instructions stored in the memory, so as to enable the chip to implement the method described in the first aspect or any one of the possible designs of the first aspect, or in the second aspect or any one of the possible designs of the second aspect.

For each of the third aspect to the eighth aspect and the possible technical effects achieved by each aspect, please refer to the above description for each possible scheme in the first aspect or the first aspect, or for the possible technical effects achieved by each possible scheme in the second aspect or the second aspect, and details are not repeated here.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system provided in the present application;

fig. 2 is a flow chart of a communication method provided herein;

FIG. 3 is a flow chart of another method of communication provided herein;

FIG. 4 is a flow chart of another method of communication provided herein;

fig. 5 is a schematic structural diagram of a communication device provided in the present application;

fig. 6 is a structural diagram of a communication device according to the present application.

Detailed Description

The embodiment of the application provides a communication method and a communication device, which are used for respectively monitoring wireless links of cells corresponding to a plurality of TRPs in a multi-TRP transmission scene. The method and the device are based on the same technical concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

In the description of the present application, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order.

In the description of the present application, "at least one" means one or more, and a plurality means two or more.

In order to more clearly describe the technical solution of the embodiment of the present application, the following describes in detail the communication method and apparatus provided in the embodiment of the present application with reference to the accompanying drawings.

The communication method according to the embodiment of the present application may be applied to various communication systems, such as a Universal Mobile Telecommunications System (UMTS), a Code Division Multiple Access (CDMA) system, a Wireless Local Area Network (WLAN), a Long Term Evolution (LTE) system, a Frequency Division Duplex (FDD) system, a Time Division Duplex (TDD) system, a fifth generation (5 generation,5 g) mobile communication system or a New Radio (NR) system, or a future communication system (e.g., a sixth generation (6 generation,6 g) system) or other similar communication systems.

For example, fig. 1 shows an architecture diagram of a communication system to which the communication method of the embodiment of the present application is applied. The communication system may include access network devices (e.g., access network device 1, access network device 2, and access network device 3 in fig. 1) and terminal devices. The terminal device is located in the coverage area of one or more cells (carriers) provided by the access network device, and there may be one or more cells serving the terminal device. When there are multiple cells serving a terminal device, the terminal device may operate in Carrier Aggregation (CA) or Dual Connectivity (DC) or coordinated multiple point transmission/reception (CoMP) manner. Wherein at least one of the plurality of cells serving the terminal device is configured to provide more than one set of transmission parameters (numerology) for providing radio resources for the terminal device. For example, as shown in fig. 1, the terminal device is located in a cell of the access network device 1, a cell of the access network device 2, and a cell of the access network device 2 at the same time. The access network device 1 may be a macro base station (e.g., macro eNB), and the access network device 2 and the access network device 3 may be micro base stations (e.g., small enbs).

Among them, a terminal device, also called a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., refers to a device providing voice and/or data connectivity to a user. Such as a handheld device, a vehicle-mounted device, etc., having a wireless connection function. Currently, some examples of terminals may be: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm top computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote operation (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in home (smart home), etc., and may also be a chip or a chip module (or a chip system) that can be provided to the above devices. The embodiments of the present application do not limit the application scenarios. In the present application, a terminal device having a wireless transceiving function and a chip that can be installed in the terminal device are collectively referred to as a terminal device.

An access network device refers to a Radio Access Network (RAN) node (or device) that accesses a terminal device to a wireless network, and may also be referred to as a base station. Currently, some examples of RAN nodes may be: a next generation Node B (gNB), 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 (e.g., home NodeB or home Node B, HNB), a Base Band Unit (BBU), or a wireless fidelity (Wifi) Access Point (AP), etc.

In addition, in a network structure, the access network device may be a RAN device including a Centralized Unit (CU) node, or a Distributed Unit (DU) node, or including a CU node and a DU node. The RAN equipment comprising the CU nodes and the DU nodes divides protocol layers of an eNB in an LTE system, the functions of part of the protocol layers are controlled in the CU in a centralized mode, the functions of the rest part or all of the protocol layers are distributed in the DU, and the DU is controlled in the CU in a centralized mode. For example, in some deployments, the gNB may include CUs and DUs. The gNB may also include a Radio Unit (RU). The CU implements part of functions of the gNB, the DU implements part of functions of the gNB, for example, the CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) layers, and the DU implements Radio Link Control (RLC), media Access Control (MAC) and Physical (PHY) layers.

It should be noted that the devices shown in the communication system shown in fig. 1 are only examples, and may also include other types of devices, such as core network devices, and the like, which are not shown in this application one by one.

It should be noted that the number of devices shown in the communication system shown in fig. 1 is merely an example, and it should be understood that more or less devices may be included, and the present application is not limited thereto.

In order to better understand the communication method provided by the embodiments of the present application, first, the terms referred to in the present application will be briefly described.

1. TRP: a network node operable to implement receiving and/or transmitting. The network node for transmitting may also be referred to as a Transmission Point (TP), and the network node for receiving may also be referred to as a Reception Point (RP). In the embodiment of the present application, a plurality of TRPs may be understood as a plurality of antennas or antenna panels separated from each other in a geographic location of an access network device (e.g., a base station), and implement the function of receiving and/or transmitting wireless signals in different beam directions from different geographic locations.

2. Cell (cell): a cell is described from the perspective of a resource management or mobility management or serving element. The coverage area of each access network device may be divided into one or more cells, and each cell may correspond to one or more frequency points, or each cell may be regarded as an area formed by the coverage areas of one or more frequency points.

It should be noted that a cell may be an area within the coverage of a wireless network of access network devices. In the embodiment of the present application, different cells may correspond to the same or different access network devices.

It should be understood that a cell is a coverage area of an access network device (e.g., a base station).

Each cell may include one or more TRPs, and in the cell, the terminal device may perform data transmission with the one or more TRPs, that is, the terminal device may perform single TRP transmission or may perform multiple TRP transmissions in the cell. Where multiple TRP transmissions in a cell may be understood as configuring multiple sets of communication resources for the cell, which may be, for example, spatial domain resources such as beams. Alternatively, the data transmission between the terminal device and a plurality of TRPs may also be understood as the communication between the terminal device and a plurality of network nodes implementing receiving and/or transmitting functions.

3. A serving cell: in order to communicate with the access network device, the terminal device needs to establish a wireless connection with a cell controlled by the access network device, and the cell in which the wireless connection is established with the terminal device may be referred to as a serving cell of the terminal device.

Some techniques related to the present application are explained below:

1. a Beam Failure Recovery (BFR) technique in multiple TRP transmission.

(1) Beam failure detection

The method comprises the steps that terminal equipment measures downlink reference signals, when all reference signal measurement results in a configured monitoring reference signal set (radio link monitoring RS) are smaller than a configured threshold value, a beam failure instance (beam fa failure instance) is considered to be generated, and a physical layer reports the beam failure instance to an MAC layer;

when a Media Access Control (MAC) layer receives a beam failure instance reported by a physical layer, the value of a beam failure instance Counter (BFI _ Counter) is added by 1, and a beam failure detection timer (beamfailure detection timer) is started or restarted, before the beam failure detection timer expires, if the value of the beam failure instance Counter is greater than or equal to a configured maximum number of times (beamfailure occurrence probability count), the terminal device considers that a beam failure occurs. It should be noted that when the beam failure detection timer expires, the beam failure instance counter is cleared.

In an mTRP scenario, for example, an inter-cell mTRP (multi-TRP) scenario, a terminal device may perform beam failure detection on each TRP separately.

(2) New beam identification

A candidate beam reference signal set (candidate beam reference list) is configured by high-level signaling, each reference signal corresponds to one beam direction, a terminal equipment physical layer measures the reference signals in the set, and when the measurement result is higher than a corresponding threshold value, the physical layer reports the reference signal information to an MAC layer, and the candidate beam is considered to be detected.

In an mTRP scene, for example, an inter-cell mTRP scene, the terminal device identifies whether there is an available candidate beam for a TRP in which a beam failure occurs.

(3) Beam failure recovery request

If a beam failure occurs in a specific cell (scell) (including a primary cell (PCell) and a primary secondary cell (PSCell), or only including the PCell), and all TRPs in the scell have a beam failure, the terminal device initiates a beam failure recovery request (BFRQ) through random access; if a part of TRPs in the SpCell has a beam failure, the terminal device initiates a beam failure recovery request by sending a BFR media access control element (MAC CE), where the BFR MAC CE carries serving cell information of the beam failure, the TRP information of the beam failure, whether a candidate beam is identified, and if a candidate beam is identified, the BFR MAC CE also carries candidate beam information.

If the SCell has beam failure, whether all TRPs in the SCell have beam failure or not is judged, a beam failure recovery request is initiated in a mode of sending a BFR MAC CE, the BFR MAC CE carries service cell information with beam failure, TRP information with beam failure or whether candidate beams are identified, and if the candidate beams are identified, the BFR MAC CE also carries the candidate beam information.

(4) Beam failure recovery response

If the terminal device is a beam failure recovery request initiated by a random access mode, when the random access is successfully completed, the terminal device considers that a response message of successful beam recovery is received, i.e. the response message of successful beam recovery is taken as the response message of beam failure recovery.

If the terminal device sends a beam failure recovery request initiated by a BFR MAC CE, the access network device sends a Physical Downlink Control Channel (PDCCH) scrambled by a cell radio network temporary identifier (C-RNTI), and the PDCCH indicates newly transmitted uplink scheduling information to serve as a response message for beam failure recovery.

If the terminal device does not receive the response message of the beam failure recovery, the terminal device may trigger the beam failure again and send a beam failure recovery request.

2. Radio Link Failure (RLF) detection

The terminal device performs Radio Link Monitoring (RLM) on the SpCell, and determines whether or not RLF occurs in a Radio Resource Control (RRC) layer. The terminal device considers that RLF occurs when any one of the following occurs: (1) physical layer link problems; (2) random access has problems; (3) Radio Link Control (RLC) layer retransmissions exceed a maximum number of times; (4) Continuous Listen Before Talk (LBT) failures. Since the present application relates to RLF caused by physical layer link problems, the procedure for triggering RLF by physical layer link problems, and the behavior of the terminal device after RLF occurs, are described below.

The access network device configures a wireless link monitoring reference signal set to the terminal device and configures a threshold value for judging synchronization or desynchronization. And when the physical layer of the terminal equipment judges that the link quality of all the reference signals in the set is less than the out-of-synchronization threshold value, indicating one out-of-synchronization to the RRC layer. When the physical layer of the terminal equipment judges that the link quality of any reference signal in the set is greater than the synchronization threshold value, one-time synchronization is indicated to the RRC layer.

After continuously receiving the out-of-sync indication of the physical layer for N310 times, the terminal equipment starts a T310 timer, and when the T310 timer expires, the terminal equipment considers that RLF occurs; after receiving the synchronization indication of the physical layer N311 times continuously, the terminal device stops the T310 timer. Wherein N310 and N311 are configured thresholds for the number of synchronization and out-of-synchronization respectively for the access network device. The initial value of the T310 timer is configured by the access network equipment.

And when the terminal equipment judges that RLF occurs, the RRC reestablishment process is initiated.

Currently, in a multi-TRP transmission scenario, a plurality of TRPs communicating with a terminal device may correspond to different Physical Cell Identities (PCIs). Wherein the plurality of TRPs may correspond to at least one serving cell and at least one secondary cell, the PCIs of the at least one serving cell and the at least one secondary cell being different. For the multi-TR P transmission scenario, the existing radio link monitoring technology cannot identify which TRP and its associated cell have RLF, and cannot accurately perform the radio link recovery process. Based on this, the present application provides a communication method for determining how to perform radio link monitoring on multiple TRPs in the multi-TR P transmission scenario.

It should be noted that, in the embodiment of the present application, the terminal device, or a processor in the terminal device, or a chip system, or a functional module and the like may be used to implement the wireless link monitoring; the terminal device may interact with the access network device, or a processor in the access network device, or a chip system, or a functional module, etc. In the following embodiments, the communication method provided in the present application is described in detail only by taking as an example that the execution subject is a terminal device and an access network device, but the present application is not limited thereto.

Based on the above description, the communication method provided in the embodiment of the present application is applicable to the communication system shown in fig. 1. Referring to fig. 2, a specific process of the method may include:

step 201: the first access network equipment generates radio link monitoring configuration information of a first TRP and radio link monitoring configuration information of a second TRP, wherein the terminal equipment is communicated with the first TRP and the second TRP.

Specifically, the first TRP may be understood as an antenna or antenna panel of the first access network device, and the second TRP may be understood as an antenna or antenna panel of the second access network device. The first access network device is an access network device that manages radio resources of a serving cell, and the serving cell may be said to belong to the first access network device, and the second access network device is an access network device that manages radio resources of the first cell, and the first cell may be said to belong to the second access network device, and PCIs of the serving cell and the first cell are different. Further, it can be said that the first TRP corresponds to the serving cell and the second TRP corresponds to the first cell.

In the following description, an auxiliary cell is taken as an example for description, and it should be understood that the present application does not limit what name the first cell takes.

It should be noted that the TRPs communicated with the terminal device are not limited to the first TRP and the second TRP, and may be a plurality of TRPs. Other pluralities of TRPs may correspond to the serving cell and the secondary cell, respectively. That is, the terminal device may have one or more serving cells and one or more auxiliary cells, and for convenience of description, two TRPs, i.e., one serving cell and one auxiliary cell, are taken as an example for illustration in this application.

Optionally, the first access network device and the second access network device may be the same or different. When the first access network device and the second access network device are the same, the serving cell and the auxiliary cell belong to the same access network device, the first TRP and the second TRP may be understood as antennas or antenna panels of the same access network device in different geographical locations, and the first TRP and the second TRP may communicate with the terminal device in different beam directions. When the first access network device is different from the second access network device, the serving cell and the auxiliary cell belong to different access network devices, and the first TRP and the second TRP belong to antennas or antenna panels of different access network devices.

In an alternative embodiment, when the serving cell and the secondary cell belong to different access network devices, i.e. the first access network device and the second access network device are different. The first access network device may receive the radio link monitoring configuration information for the second TRP from the second access network device and determine the radio link monitoring configuration information for the first TRP locally. It should be understood that when there are other secondary cells and the access network device to which the other secondary cells belong is different from both the first access network device and the second access network device, the first access network device also receives radio link monitoring configuration information of TRPs corresponding to the other secondary cells from the access network device to which the other secondary cells belong.

In another optional implementation, when the serving cell and the auxiliary cell belong to the same access network device, that is, the first access network device and the second access network device are the same access network device. The first access network device may locally determine the radio link monitoring configuration information for the first TRP and the radio link monitoring configuration information for the second TRP.

Illustratively, the radio link monitoring configuration information of the first TRP may include one or more of: a radio monitoring reference signal set of a first TRP, a physical layer link synchronization threshold value of the first TRP, a physical layer link out-of-step threshold of the first TRP, counter information of a recorded physical layer link synchronization indication of the first TRP, counter information of a recorded physical layer link out-of-step indication of the first TRP, timer information of whether RLF occurs or not is judged by the first TRP, or a number of times of the out-of-step indication of the RLF occurs is judged; the radio link monitoring configuration information for the second TRP may include one or more of: a radio monitoring reference signal set of a second TRP, a physical layer link synchronization threshold value of the second TRP, a physical layer link out-of-step threshold of the second TRP, counter information of a recorded physical layer link synchronization indication of the second TRP, counter information of a recorded physical layer link out-of-step indication of the second TRP, timer information of whether RLF occurs or not is judged by the second TRP, or a number of times of the out-of-step indication of the RLF is judged.

The radio link monitoring configuration information of the first TRP may be included in the configuration information of the serving cell; the radio link monitoring configuration information of the second TRP may be included in the configuration information of the secondary cell. In some possible scenarios, the configuration information of the second TRP may be regarded as a part of the configuration information of the serving cell, i.e., the radio link monitoring configuration information of the first TRP and the second TRP is included in the configuration information of the serving cell. In the present application, it is not limited that the configuration information of the second TRP is included in the configuration information of the serving cell or the configuration information of the secondary cell, and the description will be given by taking the example that the configuration information of the second TRP is included in the configuration information of the secondary cell.

Optionally, the configuration information of the serving cell may further include radio link restoration judgment configuration information for the first TRP, and the configuration information of the secondary cell may further include radio link restoration judgment configuration information for the second TRP. For example, the radio link recovery decision configuration information may include one or more of: the physical layer link synchronization threshold value used for judging RLF recovery, the physical layer link out-of-step threshold value used for judging RLF recovery, the timer information used for judging RLF recovery, the counter information used for judging RLF recovery, or the synchronization times used for judging RLF recovery.

It should be noted that, information included in the radio link restoration judgment configuration information for the first TRP may be the same as or different from a value of corresponding information included in the radio link monitoring configuration information for the first TRP. For example, the physical layer link synchronization threshold for determining RLF recovery may be the same as the physical layer link synchronization threshold of the first TRP, and other information is the same and is not listed here. Similarly, the information included in the radio link restoration judgment configuration information for the second TRP may be the same as or different from the value of the corresponding information included in the radio link monitoring configuration information for the second TRP. Optionally, when the configuration information of the serving cell and the configuration information of the auxiliary cell are the same, the configuration information of the serving cell and the configuration information of the auxiliary cell may not include radio link recovery judgment configuration information, and the terminal device may judge whether the RLF is recovered or not by using the radio link monitoring configuration information of the first TRP and the radio link monitoring configuration information of the second TRP, which is not limited in this application. Optionally, the configuration information of the serving cell may further include one or more of the following: a synchronization signal and physical broadcast channel block (SSB) configuration, a channel state information reference signal (CSI-RS) configuration, a transmission configuration indication state (TCI) configuration, or a PCI. The configuration information of the secondary cell may further include one or more of: SSB configuration, CSI-RS configuration, TCI state configuration, or PCI.

Step 202: the first access network equipment sends the radio link monitoring configuration information of the first TRP and the radio link monitoring configuration information of the second TRP to the terminal equipment; that is, the terminal device receives the radio link monitoring configuration information of the first TRP and the radio link monitoring configuration information of the second TRP from the first access network device.

Optionally, the first access network device may further send the radio link restoration judgment configuration information mentioned in step 201 to the terminal device.

Illustratively, the first access network device may send the radio link monitoring configuration information of the first TRP by sending the configuration information of the serving cell to the terminal device, and send the radio link monitoring configuration information of the second TRP by sending the configuration information of the secondary cell to the terminal device. Specifically, the configuration information of the serving cell and the configuration information of the secondary cell may be referred to in the related description in step 201.

It should be noted that, when the radio link monitoring configuration information of the second TRP and the radio link monitoring configuration information of the first TRP have the same value, the configuration information of the auxiliary cell may not include the configuration information having the same value, and the terminal device may determine the radio link monitoring configuration information of the second TRP with reference to the corresponding information of the radio link monitoring information of the first TRP in the configuration information of the serving cell. Similarly, when the radio link restoration judgment configuration information of the second TRP and the radio link restoration judgment configuration information of the first TRP have the same value, the terminal device may not include the part of the configuration information having the same value in the configuration information of the auxiliary cell, and may determine the radio link restoration judgment configuration information of the second TRP by referring to the corresponding information of the radio link restoration judgment configuration information of the first TRP in the configuration information of the serving cell.

It should be noted that, when there are multiple serving cells and multiple secondary cells, the first access network device further sends configuration information of other serving cells and configuration information of other secondary cells to the terminal device. The configuration information of other serving cells is similar to the configuration information of the serving cell related to step 201, except that the corresponding TRPs are different; the configuration information of the other secondary cells is similar to that of the secondary cell involved in step 201, except that the corresponding TRPs are different.

In an alternative embodiment, as shown in fig. 2, after step 202 and before step 203, the terminal device further performs the following steps 202a and 202b:

step 202a: the terminal equipment performs cell measurement.

For example, the terminal device measures the reference signals of the at least one serving cell respectively according to the received configuration information of the at least one serving cell, for example, performs measurement of beam-level granularity, and measures the reference signals of the at least one secondary cell respectively according to the received configuration information of the at least one secondary cell, for example, performs measurement of beam-level granularity.

Step 202b: and the terminal equipment sends the cell measurement result to the first access network equipment.

Illustratively, the terminal device sends the cell measurement result of the at least one serving cell and the cell measurement result of the at least one secondary cell (e.g., the measurement result of the beam-level granularity) obtained in step 202a to the first access network device.

After the first access network device receives the measurement result of each cell, execute step 202c: the first access network device sends a multi-TRP transmission message to the terminal device, where the multi-TRP transmission message is used to notify the terminal device to communicate with multiple TRPs, for example, to perform inter-cell multi-TRP (inter-cell mTRP) transmission. Then, the terminal device communicates with multiple TRPs, that is, performs uplink and downlink data transmission with multiple access network devices, as shown in step 202d in fig. 2. It should be noted that some or all of the TRPs in the plurality of TRPs may correspond to the same access network device, and only the access network device where the first TRP and the second TRP correspond to different TRPs is illustrated in fig. 2 as an example.

The terminal device communicates with a plurality of TRPs, which may be understood as the terminal device communicating via a plurality of sets of communication resources. Optionally, the communication resource may be a spatial domain resource, such as a beam.

Illustratively, the first access network device determines, according to the cell measurement result in step 202b, a cell whose signal quality is greater than a certain threshold, and then determines that the terminal device can communicate with the TRP corresponding to the determined cell. It should be noted that, in the following description of the present application, a terminal device is exemplified to communicate with a first TRP and a second TRP.

Optionally, the multi-TRP transmission message may include an identifier of the at least one secondary cell (e.g., a PCI of the secondary cell), and a beam direction (e.g., a TCI status) used by the terminal device in the at least one secondary cell.

Optionally, the plurality of TRP transmission messages may be physical layer messages (also referred to as layer 1 (L1) messages), such as PDCCH messages; or the plurality of TRP transfer messages may be MAC layer messages (also referred to as layer2 (L2) messages), such as MAC CE messages.

Step 203: and the terminal equipment monitors the wireless link of the serving cell according to the wireless link monitoring configuration information of the first TRP and monitors the wireless link of the auxiliary cell according to the wireless link monitoring configuration information of the second TRP.

Illustratively, the terminal device performs radio link monitoring on the serving cell according to the radio link monitoring configuration information of the first TRP, and determines whether the serving cell has RLF; and performing radio link monitoring on the auxiliary cell according to the radio link monitoring configuration information of the second TRP, and judging whether the auxiliary cell generates RLF. Optionally, the terminal device determines that the serving cell or the secondary cell generates the RLF, and the specific method may be: the terminal equipment determines that primary desynchronizing occurs after determining that the quality of the physical layer link of the serving cell or the auxiliary cell is lower than the respective corresponding desynchronizing threshold value, and determines that primary synchronizing occurs after determining that the quality of the physical layer link of the serving cell or the auxiliary cell is higher than the respective corresponding synchronizing threshold value; the terminal equipment starts a first timer after determining that the first preset times of desynchronization continuously occur, and stops the operation of the first timer after determining that the second preset times of synchronization continuously occur; and when the terminal equipment determines that the first timer is overtime, determining that the RLF occurs in the serving cell or the auxiliary cell.

Optionally, the process of the terminal device determining that the serving cell or the secondary cell generates the RLF may be completed jointly by a physical layer and an RRC layer of the terminal device. Exemplary, the specific process may be as follows: the physical layer of the terminal device measures the link quality of the physical layer of different cells respectively, and compares the measured link quality with the synchronization threshold and the out-of-synchronization threshold corresponding to each cell respectively, wherein the synchronization threshold corresponding to each cell may be the same or different, and similarly, the out-of-synchronization threshold corresponding to each cell may be the same or different, which is not limited in the present application; the RRC layer of the terminal equipment respectively counts the synchronous indication or the out-of-step indication of different cells reported by the physical layer and starts/stops the operation of the timer.

For example, for the serving cell: a physical layer of the terminal equipment sends a primary out-of-step instruction to an RRC layer of the terminal equipment after judging that the quality of a physical layer link of a serving cell is lower than an out-of-step threshold value corresponding to the serving cell, and sends a primary synchronous instruction to the RRC layer after judging that the quality of the physical layer link of the serving cell is higher than a synchronous threshold value corresponding to the serving cell; the RRC layer starts a first timer after determining that the out-of-step indication of a first preset number of times is continuously received, and stops the operation of the first timer after determining that the synchronous indication of a second preset number of times is continuously received; and when the RRC layer determines that the first timer is overtime, the RLF of the serving cell is determined.

As another example, for a secondary cell: a physical layer of the terminal equipment sends a primary out-of-sync instruction to an RRC layer of the terminal equipment after judging that the quality of a physical layer link of the auxiliary cell is lower than an out-of-sync threshold corresponding to the auxiliary cell, and sends a primary in-sync instruction to the RRC layer after judging that the quality of the physical layer link of the auxiliary cell is higher than a synchronous threshold corresponding to the auxiliary cell; the RRC layer starts a first timer after determining that the out-of-step instructions of a first preset number of times are continuously received, and stops the operation of the first timer after determining that the synchronous instructions of a second preset number of times are continuously received; and when the RRC layer determines that the first timer is overtime, determining that the RLF occurs in the auxiliary service cell.

Optionally, the out-of-synchronization indication corresponding to the serving cell may include an identifier of the serving cell, or a PCI of the serving cell, or an identifier of a corresponding TRP; the synchronization indication of the serving cell may include an identity of the serving cell, or a PCI of the serving cell, or an identity of a corresponding TRP. The identification of the secondary cell, or the PCI of the secondary cell, or the identification of the corresponding TRP can be included in the out-of-synchronization indication corresponding to the secondary cell; the synchronization indication of the secondary cell may include an identity of the secondary cell, or a PCI of the secondary cell, or an identity of a corresponding TRP.

In the two examples, the out-of-synchronization threshold of the serving cell and the out-of-synchronization threshold of the secondary cell are the same and both are the first preset times, the synchronization threshold of the serving cell and the synchronization threshold of the secondary cell are the same and both are the second preset times, and the countdown start values of the timers corresponding to the serving cell and the secondary cell are both the countdown start values of the first timer. It should be understood that the above parameters of the serving cell and the secondary cell may not be the same. For example, the out-of-sync number threshold of the serving cell may be configured as N310a (e.g., may be 4), the in-sync number threshold may be configured as N311a (e.g., may be 3), and the countdown start value of the timer corresponding to the serving cell may be configured as T310a (e.g., may be 1000 milliseconds); the out-of-sync number threshold of the secondary cell may be configured as N310b (e.g., may be 6 times), the in-sync number threshold may be configured as N311b (e.g., may be 5 times), and the timer corresponding to the secondary cell may be configured as T310b (e.g., may be 500 milliseconds). It should be understood that the above listed times or names of timers are merely examples and other names may be substituted.

In some embodiments, the RLF determination procedure of the other serving cell or the other secondary cell is the same as the RLF determination procedure of the serving cell and the secondary cell listed above, and may be referred to each other.

It should be noted that, in the description of the above procedure, the description of performing radio link monitoring on a cell (e.g., a serving cell or an auxiliary cell) may be alternatively described as performing radio link monitoring on a TRP (e.g., a first TRP, a second TRP), and the like, which is not limited in this application.

Through the above procedure, the terminal device can determine which cells have RLF occurred and which cells have not. Depending on the cell where RLF occurs, three different scenarios may be included:

in scenario a1, after the terminal device determines that all cells, that is, all serving cells and all auxiliary cells, have RLFs, that is, all TRPs in the multi-TRP transmission scenario have RLFs, the terminal device initiates an RRC reestablishment procedure.

Scenario a2, when the terminal device determines that the serving cell does not generate RLF and part or all of the secondary cells generate RLF, the terminal device performs step 204a in the flow shown in fig. 3.

Scenario a3, when the terminal device determines that the serving cell has RLF and at least one secondary cell has no RLF, the terminal device performs step 204b in the flow shown in fig. 4.

The following describes the flow in each of the scenarios a2 and a3 in detail.

Scenario a2 is described below with reference to fig. 3:

for example, in scenario a2, a serving cell corresponding to the first TRP and an auxiliary cell corresponding to the second TRP are used as an example for description. The scene principle of a plurality of service cells and a plurality of auxiliary cells is the same, and the service cells and the auxiliary cells can be mutually referred.

When the terminal equipment determines that the serving cell does not generate RLF and the secondary cell generates RLF, the terminal equipment performs step 204a shown in fig. 3: the terminal equipment sends a first message to the first access network equipment, wherein the first message is used for informing the secondary cell of RLF.

For example, the terminal device may send the first message to the first access network device, specifically, the first message may be sent through physical layer signaling, for example, physical Uplink Control Channel (PUCCH) message, or sent by multiplexing Uplink Control Information (UCI) in a physical uplink data channel (PUSCH), or sent through MAC CE, or sent through RRC message, or sent through other uplink messages, and this application does not limit what kind of message the first message is specifically sent through.

In an alternative embodiment, the first message may include one or more of the following information: an identity of the secondary cell, an identity of the second TRP, a PCI of the secondary cell, a cause of RLF of the secondary cell (e.g., physical layer link problem), a beam level measurement result of the reference signal of the first TRP, a cell level measurement result of the reference signal of the first TRP, a beam level measurement result of the reference signal of the second TRP, a cell level measurement result of the reference signal of the second TRP, a beam level measurement result of the reference signal of the third TRP, or a cell level measurement result of the reference signal of the third TRP; and the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP, wherein the third TRP can be one or more TRPs, and the third TRP can correspond to one or more cells. Wherein, the one or more cells corresponding to the third TRP may be neighboring cells of the serving cell, and it should be understood that these neighboring cells corresponding to the third TRP do not include the auxiliary cell.

In a scenario with multiple secondary cells, when there is another secondary cell that generates RLF, the first message further includes related information of the other secondary cell, such as an identifier of the other secondary cell, an identifier of a TRP corresponding to the other secondary cell, a PCI of the other secondary cell, a cause of RLF generation in the other secondary cell, a beam level measurement result of a reference signal of the TRP corresponding to the other secondary cell, or a cell level measurement result of the reference signal.

Optionally, after step 204a, the terminal device further executes step 206a: the terminal device executes a first operation, wherein the first operation may include any one or more of the following:

deactivating (deactivating) the secondary cell (or the second TRP) by the terminal device;

the terminal equipment releases (releases) the resources occupied by the auxiliary cell (or the second TRP);

the terminal equipment deletes (delete) the configuration information of the auxiliary cell (or the second TRP);

not monitoring (or listening to) the PDCCH of the secondary cell (or second TRP);

for a beam failure of the secondary cell (or the second TRP), if no candidate beam available for the secondary cell (or the second TRP) is identified, the terminal device does not send a beam failure recovery request, e.g., the terminal device does not send a BFR MAC CE;

the terminal equipment performs RLM on the auxiliary cell (or the second TRP) and judges whether the radio link of the auxiliary cell (or the second TRP) is recovered;

the terminal equipment does not perform RLM on the auxiliary cell (or the second TRP); or alternatively

The terminal equipment increases (add) and/or activates (activate) the transmission of a fourth TRP, the third TRP comprising said fourth TRP.

For example, when the first operation terminal device does not monitor the PDCCH of the secondary cell (or the second TRP), the terminal device may not monitor the PDCCH of the secondary cell (or the second TRP) even during a Discontinuous Reception (DRX) active period of the RRC connected state.

The terminal device does not send a beam failure recovery request if the beam failure of the secondary cell (or the second TRP) is not identified by the beam failure of the secondary cell (or the second TRP) through the first operation, and the terminal device can reduce unnecessary BFR MAC CE reporting and reduce uplink transmission load.

It should be noted that, when there are multiple secondary cells and there are other secondary cells with RLF, the terminal device also performs the above operations for other secondary cells with RLF, and this application is not described in detail again.

In an alternative embodiment, the terminal device may directly perform the step 206a after performing the step 204a, wherein when the terminal device directly performs the step 206a after performing the step 204a and the terminal device increases and/or activates the transmission of the fourth TRP, the terminal device sends a notification message to the first access network device, where the notification message is used to notify that the transmission of the fourth TRP has been increased and/or activated. Alternatively, the third TRP may include a fourth TRP, i.e. the fourth TRP may be one of the third TRPs described above, for example, the TRP with the best signal quality.

Illustratively, when the terminal device directly performs the step 206a after performing the step 204a, the first message may further include the first operation performed by the terminal device.

In another alternative implementation, the terminal device may also perform step 260a after step 205a described below. Specifically, step 205a: the first access network device sends a first response message to the terminal device, where the first response message is used to respond to the first message, and the first response message may include one or more of the following indication information:

information indicating successful reception of the first message, for example, may be indicated by 1-bit Acknowledgement (ACK) information;

information instructing the terminal device to deactivate the secondary cell (or second TRP);

information instructing the terminal device to release resources occupied by the secondary cell (or the second TRP);

information instructing the terminal device to delete (delete) the configuration information of the secondary cell (or the second TRP); or

Information instructing the terminal device to increase and/or activate transmission of the fourth TRP.

That is to say, the first access network device instructs the terminal device to perform the first operation through the indication information of the first response message, that is, the terminal device performs the first operation according to the indication of the first access network device.

For example, the first access network device may send the first response message to the terminal device through a physical layer message (e.g., a PDCCH message), a MAC layer message (e.g., a MAC CE), an RRC message, or another message, which is not limited in this application.

In a specific embodiment, when the first response message includes information indicating that the terminal device deactivates the secondary cell, the first response message may further include a first duration and/or a second duration, where the first duration is a duration for deactivating the secondary cell, and the second duration is a duration between a time when the first response message is received and a starting time for deactivating the secondary cell; optionally, the terminal device may continue RLM for the secondary cell for the first duration and/or the second duration. When the first response message includes information indicating that the terminal device releases the resource occupied by the secondary cell, the first response message may further include a third duration, where the third duration is a duration from a time when the first response message is received to a starting time when the terminal device releases the resource occupied by the secondary cell; optionally, the terminal device may perform RLM on the secondary cell until the secondary cell is released.

Optionally, when the terminal device performs the first operation to RLM the secondary cell (or the second TRP), and determines whether the radio link of the secondary cell (or the second TRP) is recovered, when it is determined that the radio link of the secondary cell is recovered, the terminal device may further perform step 207a: and the terminal equipment sends a first recovery message to the first access network equipment, wherein the first recovery message is used for informing that the wireless link of the auxiliary cell is recovered.

For example, the terminal device may send the first recovery message to the first access network device, specifically, the first recovery message may be sent through physical layer signaling such as PUCCH message, or sent in a manner of multiplexing UCI in PUSCH, or sent through MAC CE, or sent through RRC message, or sent through other uplink messages.

In one embodiment, the first recovery message may include one or more of the following information: an identity of the auxiliary cell, an identity of the second TRP, a PCI of the auxiliary cell, a cause of radio link recovery (e.g., physical layer link problem recovery), a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of the third TRP, or a cell level measurement result of a reference signal of the third TRP.

In a scenario of multiple secondary cells, when the radio links of other secondary cells in which RLF occurs are restored, the first restoration message further includes related restoration information of other secondary cells, such as an identifier of any other secondary cell, an identifier of a TRP corresponding to any other secondary cell, a PCI of any other secondary cell, a cause of restoring the radio links of any other secondary cell, and a result of measuring a beam level of a reference signal or a cell level of a reference signal of the TRP corresponding to any other secondary cell.

In an exemplary embodiment, the terminal device determines that the radio link of the secondary cell is restored, and the specific method may be: the terminal equipment determines that primary synchronization occurs after judging that the quality of a physical layer link of the auxiliary cell is higher than a synchronization threshold value; and then the terminal equipment determines that the number of times of continuous synchronization in the preset time length is greater than or equal to a third preset number, or determines that the total number of times of synchronization is greater than or equal to the third preset number, and determines that the wireless link of the auxiliary cell is recovered.

Alternatively, the determination that the radio link of the secondary cell is restored by the terminal device may be performed by both the physical layer and the RRC layer of the terminal device. Exemplary, the specific process may be as follows: the physical layer of the terminal device measures the physical link quality of the secondary cell and compares the measured physical link quality with the synchronization threshold corresponding to the secondary cell, where the synchronization threshold is the synchronization threshold of the secondary cell involved in step 203. The RRC layer performs operations of counting and starting/stopping a timer for the synchronization indication of the secondary cell reported by the physical layer, and further determines whether the radio link of the secondary cell has been recovered. For example, the physical layer of the terminal device sends a primary synchronization instruction to the RRC layer after determining that the quality of the physical layer link of the secondary cell is higher than the synchronization threshold; and the RRC layer of the terminal equipment determines that the number of times of continuously receiving the synchronous indication in the preset time length is greater than or equal to a third preset number of times, or determines that the wireless link of the auxiliary cell is recovered when the total number of times of receiving the synchronous indication is greater than or equal to the third preset number of times. Optionally, the third preset number may be the same as or different from the second preset number related in step 203, which is not limited in this application.

Optionally, the synchronization indication reported to the RRC layer by the physical layer may include an identifier of the secondary cell, a PCI of the secondary cell, or an identifier of the second TRP.

It should be noted that, the above procedure can be referred to for the determination procedure of whether the radio link of the other secondary cell in which the RLF occurs is recovered.

In an exemplary embodiment, upon determining that the radio link of the secondary cell has been restored, the terminal device may perform one or more of the following operations:

the terminal equipment activates a secondary cell (or a second TRP);

the terminal equipment requests the first access network equipment to increase the transmission of the second TRP;

the terminal equipment requests configuration information of a secondary cell (or a second TRP) from the first access network equipment;

a beam failure recovery request process for recovering the auxiliary cell by the terminal equipment;

the terminal equipment resumes monitoring the PDCCH of the secondary cell (or the second TRP); or alternatively

The terminal device recovers the RLM procedure of the secondary cell (or the second TRP).

In an alternative embodiment, the terminal device may perform the above operation directly after performing step 207 a.

In another alternative embodiment, the terminal device may perform the above operation directly after step 208 a. Specifically, step 208a: the first access network device sends a first recovery response message to the terminal device, where the first recovery response message is used to respond to the first recovery message, and the first recovery response message may include one or more of the following indication information:

information indicating successful reception of the first recovery message, which may be indicated by 1-bit ACK information, for example;

information indicating activation of a secondary cell (or a second TRP);

configuration information indicating a secondary cell (or a second TRP); or

Information indicating an increase in transmission of a second TRP.

That is to say, the first access network device instructs the terminal device to perform the above operation through the indication information of the first recovery response message, that is, the terminal device performs the above operation according to the indication of the first access network device.

For example, the first access network device may send the first recovery response message to the terminal device through a physical layer message, a MAC layer message, an RRC message, or another message, which is not limited in this application.

In the scenario a2, the terminal device may report the RLF condition of the auxiliary cell through the serving cell where no RLF occurs, so as to avoid unnecessary RRC reestablishment when part of the TRPs occur RLFs in the multi-TRP transmission scenario, and reduce the impact on data transmission.

Scenario a3 is described below with reference to fig. 4:

for example, in scenario a3, a serving cell corresponding to the first TRP and an auxiliary cell corresponding to the second TRP are used as an example for description. The scene principle of the multiple serving cells and the multiple auxiliary cells is the same, and the multiple serving cells and the multiple auxiliary cells can be referred to each other.

When it is determined that the serving cell has RLF and the secondary cell has not RLF, the terminal device performs step 204b: and the terminal equipment sends a second message to the second access network equipment, wherein the second message is used for informing the serving cell of RLF.

It is noted that, when there are multiple secondary cells, the secondary cell may be one of at least one secondary cell in which RLF does not occur. When there are multiple serving cells, RLF occurs for each of the multiple serving cells in this scenario a 3.

For example, the terminal device may send the second message to the second access network device, specifically, the second message may be sent through physical layer signaling such as PUCCH message, or sent in a manner of multiplexing UCI in PUSCH, or sent through MAC CE, or sent through RRC message, or sent through other uplink messages.

In an alternative embodiment, the second message may include one or more of the following information: an identity of a serving cell, an identity of a first TRP, a PCI of the serving cell, a cause of RLF of the serving cell (e.g., a physical layer link problem), a beam level measurement result of a reference signal of a second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP.

In a scenario with multiple secondary cells, when there is another secondary cell that generates RLF, the second message further includes related information of another secondary cell, such as an identifier of any other secondary cell, an identifier of a TRP corresponding to any other secondary cell, a PCI of any other secondary cell, a cause of RLF generation of any other secondary cell, a beam level measurement result of a reference signal of the TRP corresponding to any other secondary cell, or a cell level measurement result of the reference signal. In a scenario of multiple serving cells, the second message further includes related information of other serving cells, such as an identifier of any other serving cell, an identifier of a TRP corresponding to any other serving cell, a PCI of any other serving cell, a cause of RLF occurring in any other serving cell, a beam level measurement result of a reference signal of the TRP corresponding to any other serving cell, or a cell level measurement result of the reference signal.

Optionally, after step 204b, the terminal device further executes step 206b: the terminal device executes a second operation, wherein the second operation may include any one or more of the following:

the terminal equipment deactivates a serving cell (or a first TRP);

the terminal equipment releases resources occupied by a serving cell (or a first TRP);

the terminal equipment deletes the configuration information of the serving cell (or the first TRP);

the terminal device does not monitor the PDCCH of the serving cell (or the first TRP);

for a beam failure of the serving cell (or the first TRP), if no candidate beam available for the serving cell (or the first TRP) is identified, the terminal device does not send a beam failure recovery request, e.g., the terminal device does not send a BFR MAC CE;

for the beam failure of the serving cell (or the first TRP), the terminal equipment does not perform random access;

the terminal equipment performs RLM on the serving cell (or the first TRP) and judges whether the radio link of the serving cell (or the first TRP) is recovered or not;

the terminal equipment does not perform RLM on the serving cell (or the first TRP); or alternatively

The terminal device switches to the second cell, and uses the second cell as a new serving cell, the second cell is the auxiliary cell or the first neighboring cell, and the PCI of the first neighboring cell is different from the PCIs of the serving cell and the auxiliary cell, for example, the first neighboring cell may be the one with the best signal quality.

When there are a plurality of secondary cells and there are other secondary cells other than the secondary cell corresponding to the second TRP where no RLF occurs, the second cell may be one other secondary cell where no RLF occurs.

For example, when the second operation terminal device does not monitor the PDCCH of the serving cell (or the first TRP) as described above, the terminal device may not monitor the PDCCH of the serving cell (or the first TRP) even during the DRX activation period of the RRC connected state.

It should be noted that, when there are multiple secondary cells and multiple serving cells, the terminal device also performs the above operations for other secondary cells and other serving cells in which RLF occurs, and this application is not described in detail again.

In an alternative embodiment, the terminal device may directly execute the step 206b after executing the step 204b. In this case, the second message may further include the second operation performed by the terminal device.

In another alternative implementation, the terminal device may also perform step 260b after step 205b described below. Specifically, step 205b: the second access network device sends a second response message to the terminal device, where the second response message is used for responding to the second message, and the second response message may include one or more of the following indication information:

information indicating successful reception of the second message, which may be indicated by 1-bit ACK information, for example;

information indicating that the terminal device deactivates the serving cell (or the first TRP);

information indicating that a terminal device releases resources occupied by a serving cell (or a first TRP);

information instructing the terminal device to delete the configuration information of the serving cell (or the first TRP); or

Information instructing the terminal device to switch to the second cell.

That is to say, the second access network device instructs the terminal device to perform the second operation through the indication information of the second response message, that is, the terminal device performs the second operation according to the indication of the second access network device.

For example, the second access network device may send the second response message to the terminal device through a physical layer message, a MAC layer message, an RRC message, or another message, which is not limited in this application.

In a specific embodiment, when the second response message includes information indicating that the terminal device deactivates the serving cell, the second response message further includes a fourth time duration and/or a fifth time duration, the fourth time duration is a time duration for deactivating the serving cell, and the fifth time duration is a time duration from a time when the second response message is received to a starting time for deactivating the serving cell; optionally, the terminal device may continue RLM for the serving cell for the third duration and/or the fourth duration. When the second response message includes information indicating that the terminal device releases the resources occupied by the serving cell, the second response message further includes a sixth duration, where the sixth duration is a duration from a time when the second response message is received to a starting time when the terminal device releases the resources occupied by the serving cell; optionally, the terminal device may perform RLM on the serving cell until the serving cell is released.

Optionally, when the terminal device performs the second operation to RLM the serving cell (or the first TRP), and determines whether the radio link of the serving cell (or the first TRP) is recovered, and when it is determined that the radio link of the serving cell is recovered, the terminal device may further perform step 207b: and the terminal equipment sends a second recovery message to the first access network equipment or the second access network equipment, wherein the second recovery message is used for informing that the wireless link of the serving cell is recovered.

It should be noted that the terminal device may also send the second recovery message to the access network device corresponding to the second cell after the handover. Fig. 4 only illustrates that the terminal device sends the second recovery message to the second access network device, and the present application is not limited thereto.

For example, the terminal device sends the second recovery message to the first access network device or the second access network device or the access network device corresponding to the second cell, specifically, the second recovery message may be sent through physical layer signaling such as PUCCH message, or sent in a manner of multiplexing UCI in PUSCH, or sent through MAC CE, or sent through RRC message, or sent through other uplink messages.

Optionally, the second recovery message may include one or more of the following information: an identity of a serving cell, an identity of a first TR P, a PCI of the serving cell, a cause of radio link recovery (e.g., physical layer link problem recovery), a beam level measurement result of a reference signal of a second TR P, a cell level measurement result of a reference signal of a second TRP, a beam level measurement result of a reference signal of a first TRP, a cell level measurement result of a reference signal of a first TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of a third TRP.

In a scenario of multiple secondary cells, when the radio links of other secondary cells in which RLF occurs are restored, the second restoration message further includes related restoration information of other secondary cells, such as an identifier of any other secondary cell, an identifier of a TRP corresponding to any other secondary cell, a PCI of any other secondary cell, a cause of restoring the radio links of any other secondary cell, and a result of measuring a beam level of a reference signal or a cell level of a reference signal of the TRP corresponding to any other secondary cell. In a scenario of multiple serving cells, the second recovery message further includes relevant recovery information of other serving cells, such as an identifier of any other serving cell, an identifier of a TRP corresponding to any other serving cell, a PCI of any other serving cell, a cause of radio link recovery of any other serving cell, a beam level measurement result of a reference signal of the TRP corresponding to any other serving cell, or a cell level measurement result of the reference signal.

In an exemplary embodiment, the terminal device determines that the radio link of the serving cell is restored, and the specific method may be: the terminal equipment determines that one-time synchronization occurs after judging that the quality of a physical layer link of a serving cell is higher than a synchronization threshold value; and then the terminal equipment determines that the number of times of continuous synchronization in the preset time length is greater than or equal to a fourth preset number of times, or determines that the total number of times of synchronization is greater than or equal to the fourth preset number of times, and determines that the wireless link of the serving cell is recovered.

Optionally, the determining, by the terminal device, that the radio link of the serving cell has been restored may be performed by a physical layer and an RRC layer of the terminal device together. Exemplary, the specific process may be as follows: the physical layer of the terminal device measures the quality of the physical link for the serving cell, and compares the quality with the synchronization threshold corresponding to the serving cell, where the synchronization threshold is the synchronization threshold of the serving cell involved in step 203. The RRC layer counts the synchronization indication of the serving cell reported by the physical layer and starts/stops the operation of the timer, and further determines whether the radio link of the serving cell is recovered. For example, the physical layer of the terminal device sends a synchronization indication to the RRC layer after determining that the quality of the physical layer link of the serving cell is higher than the synchronization threshold; and the RRC layer of the terminal equipment determines that the number of times of continuously receiving the synchronous indication in the preset time length is greater than or equal to a fourth preset number of times, or determines that the wireless link of the serving cell is recovered when the total number of times of receiving the synchronous indication is greater than or equal to the fourth preset number of times. Optionally, the fourth preset number may be the same as or different from the second preset number related in step 203, which is not limited in this application.

Optionally, the synchronization indication reported to the RRC layer by the physical layer may include an identifier of a serving cell, a PCI of the serving cell, or an identifier of a first TRP.

It should be noted that, the above procedure can also be referred to for the determination procedure of whether the radio link of the other secondary cell or other serving cell where the RLF occurs is recovered.

In an exemplary embodiment, when the terminal device determines that the radio link of the serving cell has been restored, the terminal device may perform one or more of the following operations:

a terminal device activates a serving cell (or a first TRP);

the terminal equipment recovers the PDCCH monitoring the serving cell (or the first TRP);

the terminal equipment requests the first access network equipment or the second access network equipment to increase the transmission of the first TRP;

the terminal equipment requests configuration information of a serving cell (or a first TRP) from the first access network equipment or the second access network equipment;

a beam failure recovery request procedure for a terminal device to recover a serving cell (or a first TRP); or alternatively

The terminal device resumes the RLM procedure of the serving cell (or first TRP).

In an alternative embodiment, the terminal device may perform the above operation directly after performing step 207 b.

In another alternative embodiment, the terminal device may perform the above operation directly after step 208b below. Specifically, step 208b: the terminal device receives a second recovery response message from the first access network device or the second access network device, where the second recovery response message is used for responding to the second recovery message, and the second recovery response message includes one or more of the following indication information:

information indicating successful reception of the second recovery message, which may be indicated by 1-bit ACK information, for example;

information indicating activation of a serving cell (or a first TRP);

configuration information indicating a serving cell (or a first TRP); or

Information indicating an increase in first TRP transmission.

It should be noted that the terminal device may also receive the second recovery response message from the access network device corresponding to the second cell, where as in fig. 4, the example that the terminal device receives the second recovery response message from the second access network device only is used, and the application is not limited thereto.

That is to say, the access network device corresponding to the first access network device or the second cell instructs the terminal device to execute the above operation through the indication information of the second recovery response message, that is, the terminal device executes the above operation according to the indication of the access network device corresponding to the first access network device or the second cell.

For example, the access network device corresponding to the first access network device or the second cell may send the second recovery response message to the terminal device through a physical layer message, a MAC layer message, an RRC message, or another message, which is not limited in this application.

In the scenario a2, the terminal device may report the RLF condition of the serving cell through the auxiliary cell in which the RLF does not occur, so that when part of the TRPs occur the RLF in a multi-TRP transmission scenario, unnecessary RRC reestablishment is avoided, and the influence on data transmission is reduced.

It should be noted that, in fig. 2 to fig. 4, only the first access network device corresponding to the first TRP and the second access network device corresponding to the second TRP are illustrated as different access network devices. It should be understood that, when the first TRP and the second TRP correspond to the same access network device, that is, the first access network device and the second access network device are the same, the operations of the first access network device and the second access network device in fig. 2 to 4 may be combined into the operation of the same access network device, and the application is not limited thereto.

Through the communication method, the terminal equipment can respectively perform radio link monitoring on the plurality of TRPs in the multi-TRP scene, so that subsequent targeted operation is performed when RLF occurs on different TRPs, and data transmission is guaranteed.

Based on the above embodiments, the present application further provides a communication apparatus, and referring to fig. 5, the communication apparatus 500 may include a transceiver unit 501 and a processing unit 502. The transceiver 501 is configured to receive information (message or data) or transmit information (message or data) to the communication apparatus 500, and the processing unit 502 is configured to control and manage actions of the communication apparatus 500. The processing unit 502 may also control the steps performed by the transceiving unit 501.

The communication apparatus 500 may specifically be the terminal device in the foregoing embodiments, a processor, a chip system, or a functional module; alternatively, the communication apparatus 500 may specifically be the first access network device in the foregoing embodiment, a processor, a chip system, or a functional module of the first access network device; alternatively, the communication apparatus 500 may specifically be the second access network device in the foregoing embodiment, a processor, a chip system, or a functional module of the second access network device.

In an embodiment, when the communication apparatus 500 is used to implement the functions of the terminal device in the embodiments described in fig. 2 to fig. 4, the transceiving unit 501 may implement transceiving operations performed by the terminal device in the embodiments shown in fig. 2 to fig. 4; the processing unit 502 may implement operations other than transceiving operations performed by the terminal device in the embodiments illustrated in fig. 2-4. For example, the transceiver unit 501 is configured to receive radio link monitoring configuration information of a first TRP and radio link monitoring configuration information of a second TRP from a first access network device; the processing unit 502 is configured to perform radio link monitoring on the serving cell according to the radio link monitoring configuration information of the first TRP, and perform radio link monitoring on the first cell according to the radio link monitoring configuration information of the second TRP. Specifically, the related detailed description may refer to the related description in the embodiments shown in fig. 2 to fig. 4, and will not be described in detail here.

In another embodiment, when the communication apparatus 500 is used to implement the functions of the first access network device in the embodiments described in fig. 2 to fig. 4, the transceiving unit 501 may implement transceiving operations performed by the first access network device in the embodiments shown in fig. 2 to fig. 4; the processing unit 502 may implement operations other than transceiving operations performed by the first access network device in the embodiments illustrated in fig. 2-4. For example, the processing unit 502 is configured to determine radio link monitoring configuration information of a first TRP and radio link monitoring configuration information of a second TRP; the transceiver unit 501 is configured to send the radio link monitoring configuration information of the first TRP and the radio link monitoring configuration information of the second TRP to the terminal device. In particular, the related detailed description can refer to the related description of the embodiments shown in fig. 2 to 4, and will not be described in detail here.

In another embodiment, when the communication apparatus 500 is used to implement the functions of the second access network device in the embodiments described in fig. 2 to fig. 4, the method may specifically include: the transceiving unit 501 is configured to perform transceiving operations performed by the second access network device in the embodiments shown in fig. 2 to fig. 4; the processing unit 502 may implement operations other than transceiving operations performed by the second access network device in the embodiments illustrated in fig. 2-4. In particular, the related detailed description can refer to the related description of the embodiments shown in fig. 2 to 4, and will not be described in detail here.

It should be noted that, in the embodiment of the present application, the division of the unit is schematic, and is only one logic function division, and when the actual implementation is realized, another division manner may be provided. Each functional unit in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Based on the above embodiments, the present application further provides a communication device, and referring to fig. 6, the communication device 600 may include a transceiver 601 and a processor 602. Optionally, the communication device 600 may further include a memory 603. The memory 603 may be disposed inside the communication device 600, or may be disposed outside the communication device 600. The processor 602 may control the transceiver 601 to receive and transmit information or data, etc.

Specifically, the processor 602 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of the CPU and the NP. The processor 602 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

Wherein, the transceiver 601, the processor 602 and the memory 603 are connected to each other. Optionally, the transceiver 601, the processor 602 and the memory 603 are connected to each other through a bus 604; the bus 604 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus.

In an alternative embodiment, the memory 603 is used for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 603 may include RAM, and may also include non-volatile memory (non-volatile memory), such as one or more disk memories. The processor 602 executes the application program stored in the memory 603 to implement the above functions, thereby implementing the functions of the communication device 600.

Exemplarily, the communication apparatus 600 may be a terminal device in the above-described embodiment; it may also be the first access network device in the above embodiment; it may also be the second access network device in the above embodiment.

In one embodiment, when the communication apparatus 600 implements the functions of the terminal device in the embodiments shown in fig. 2 to 4, the transceiver 601 may implement the transceiving operations performed by the terminal device in the embodiments shown in fig. 2 to 4; processor 602 may perform operations other than transceiving operations performed by the terminal device in the embodiments illustrated in fig. 2-4. The detailed description of the embodiments can be found in the embodiments shown in fig. 2 to 4, and will not be described in detail here.

In another embodiment, when the communication apparatus 600 implements the function of the first access network device in the embodiment shown in fig. 2 to 4, the transceiver 601 may implement the transceiving operation performed by the first access network device in the embodiment shown in fig. 2 to 4; processor 602 may perform operations in addition to transceiving operations performed by the first access network device in the embodiments illustrated in fig. 2-4. The detailed description of the embodiments can be found in the embodiments shown in fig. 2 to 4, and will not be described in detail here.

In another embodiment, when the communication apparatus 600 implements the function of the second access network device in the embodiment shown in fig. 2 to 4, the transceiver 601 may implement the transceiving operation performed by the second access network device in the embodiment shown in fig. 2 to 4; processor 602 may perform operations in addition to transceiving operations performed by the second access network device in the embodiments illustrated in fig. 2-4. The detailed description of the embodiments can refer to the description of the embodiments shown in fig. 2 to 4, and the detailed description is omitted here.

Based on the above embodiments, the present application provides a communication system, which may include the terminal device, the first access network device, the second access network device, and the like related to the foregoing embodiments.

The embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium is used for storing a computer program, and when the computer program is executed by a computer, the computer may implement the communication method provided by the above method embodiment.

The embodiment of the present application further provides a computer program product, where the computer program product is used to store a computer program, and when the computer program is executed by a computer, the computer may implement the communication method provided by the above method embodiment.

The embodiment of the present application further provides a chip, which includes a processor, where the processor is coupled to a memory, and is configured to call a program in the memory, so that the chip implements the communication method provided in the foregoing method embodiment.

The embodiment of the present application further provides a chip, where the chip is coupled with a memory, and the chip is used to implement the communication method provided in the above method embodiment.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A communication method is applied to a terminal device or a chip in the terminal device, and the method comprises the following steps:

receiving radio link monitoring configuration information of a first Transmission Receiving Point (TRP) and radio link monitoring configuration information of a second TRP from first access network equipment, wherein the first access network equipment is access network equipment for managing radio resources of a service cell, the first TRP is an antenna or an antenna panel of the first access network equipment, the second TRP corresponds to the first cell, physical Cell Identities (PCIs) of the service cell and the first cell are different, and the terminal equipment is communicated with the first TRP and the second TRP;

and monitoring the wireless link of the serving cell according to the wireless link monitoring configuration information of the first TRP, and monitoring the wireless link of the first cell according to the wireless link monitoring configuration information of the second TRP.

2. The method of claim 1, wherein the method further comprises:

and when the Radio Link Failure (RLF) of the serving cell is determined and the RLF of the first cell occurs, sending a first message to the first access network equipment, wherein the first message is used for informing the first cell of the RLF.

3. The method of claim 2, wherein the first message comprises one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of RLF occurring in the first cell, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

4. The method of claim 3, wherein when it is determined that the serving cell does not experience RLF and the first cell experiences RLF, the method further comprises: performing a first operation, wherein the first operation comprises any one or more of:

for the beam failure of the first cell, if the candidate beam available for the first cell is not identified, not sending a beam failure recovery request;

performing Radio Link Monitoring (RLM) on the first cell, and judging whether the radio link of the first cell is recovered; or alternatively

Increasing and/or activating transmission of a fourth TRP, the third TRP comprising the fourth TRP.

5. The method of claim 4, wherein when increasing and/or activating transmission of the fourth TRP, the method further comprises:

sending a notification message to the first access network device, the notification message notifying that transmission of the fourth TRP has been added and/or activated.

6. The method of any of claims 2-4, further comprising:

receiving a first response message from the first access network device, the first response message being used in response to the first message, the first response message including one or more of the following indication information:

information instructing the terminal device to deactivate the first cell;

information indicating that the terminal device releases resources occupied by the first cell; or

Information instructing the terminal device to increase and/or activate transmission of a fourth TRP; wherein a third TRP comprises the fourth TRP, and a PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

7. The method of any one of claims 4-6, wherein when it is determined that the radio link of the first cell has been restored, the method further comprises:

and sending a first recovery message to the first access network equipment, wherein the first recovery message is used for notifying that the radio link of the first cell is recovered.

8. The method of claim 7, wherein the first recovery message comprises one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of radio link recovery, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

9. The method of claim 7 or 8, further comprising:

performing one or more of the following operations:

requesting an increase in transmission of the second TRP to the first access network device; or alternatively

A beam failure recovery request procedure to recover the first cell.

10. The method of claim 1, wherein the method further comprises:

and when the RLF of the serving cell is determined to occur and the RLF of the first cell does not occur, sending a second message to second access network equipment, wherein the second message is used for informing the RLF of the serving cell, and the second access network equipment is the access network equipment for managing the radio resources of the first cell.

11. The method of claim 10, wherein the second message comprises one or more of the following information: an identity of the serving cell, an identity of the first TRP, a PCI of the serving cell, a cause of RLF occurring with the serving cell, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

12. The method of claim 10 or 11, wherein when it is determined that RLF occurs in the serving cell and RLF does not occur in the first cell, the method further comprises: performing a second operation, the second operation comprising any one or more of:

for the beam failure of the serving cell, if the candidate beam available for the serving cell is not identified, not sending a beam failure recovery request;

performing RLM on the serving cell, and judging whether a radio link of the serving cell is recovered; or

And switching to a second cell, wherein the second cell is used as a service cell, the second cell is the first cell or a first neighboring cell, and the PCI of the first neighboring cell is different from the PCI of the service cell and the PCI of the first cell.

13. The method of any one of claims 10-12, further comprising:

receiving a second response message from the second access network device, the second response message being used to respond to the second message, the second response message including one or more of the following indication information:

information instructing the terminal device to deactivate the serving cell;

information indicating that the terminal equipment releases resources occupied by the serving cell; or

Information indicating that the terminal device is handed over to a second cell; the second cell is the first cell or a first adjacent cell, and the PCI of the first adjacent cell is different from the PCI of the service cell and the PCI of the first cell.

14. The method of claim 12 or 13, wherein when it is determined that the radio link of the serving cell has been restored, the method further comprises:

and sending a second recovery message to the first access network device or the second access network device, where the second recovery message is used to notify that the radio link of the serving cell is recovered.

15. The method of claim 14, wherein the second recovery message comprises one or more of the following information: an identity of the serving cell, an identity of the first TRP, a PCI of the serving cell, a cause of radio link recovery, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

16. The method of claim 14 or 15, wherein the method further comprises:

performing one or more of the following operations:

requesting an increase in transmission of the first TRP to the first access network device or the second access network device; or

A beam failure recovery request procedure to recover the serving cell.

17. The method of any one of claims 1-16, further comprising:

receiving radio link restoration judgment configuration information from the first access network device, where the radio link restoration judgment configuration information includes one or more of the following: the physical layer link synchronization threshold used for judging the RLF recovery, the physical layer link desynchronization threshold used for judging the RLF recovery, the timer information used for judging the RLF recovery, the counter information used for judging the RLF recovery, or the synchronization times used for judging the RLF recovery.

18. A communication method applied to a first access network device or a chip in the first access network device, the method comprising:

generating radio link monitoring configuration information of a first Transmission and Reception Point (TRP) and radio link monitoring configuration information of a second TRP, wherein the first TRP is an antenna or an antenna panel of first access network equipment, the first access network equipment is access network equipment for managing radio resources of a serving cell, the second TRP corresponds to the first cell, physical cell identity identifiers (PCIs) of the serving cell and the first cell are different, and terminal equipment is communicated with the first TRP and the second TRP;

and sending the radio link monitoring configuration information of the first TRP and the radio link monitoring configuration information of the second TRP to the terminal equipment.

19. The method of claim 18, wherein the method further comprises:

receiving a first message from the terminal equipment, wherein the first message is used for informing the first cell of the occurrence of RLF (radio link failure).

20. The method of claim 19, wherein the first message comprises one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of RLF occurring in the first cell, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

21. The method of claim 20, wherein the method further comprises:

receiving a notification message from the terminal device, the notification message being used for notifying that the transmission of a fourth TRP has been increased and/or activated, the third TRP comprising the fourth TRP.

22. The method of claim 19 or 20, wherein the method further comprises:

sending a first response message to the terminal device, wherein the first response message is used for responding to the first message and comprises one or more of the following indication information:

information indicating that the terminal device deactivates the first cell;

Information instructing the terminal device to increase and/or activate transmission of a fourth TRP; wherein the third TRP comprises the fourth TRP, and the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

23. The method of any one of claims 19-22, further comprising:

receiving a first recovery message from the terminal device, the first recovery message notifying that the radio link of the first cell has recovered.

24. The method of claim 23, wherein the first recovery message comprises one or more of the following information: an identity of the first cell, an identity of the second TRP, a PCI of the first cell, a cause of radio link recovery, a beam level measurement result of a reference signal of the first TRP, a cell level measurement result of a reference signal of the first TRP, a beam level measurement result of a reference signal of the second TRP, a cell level measurement result of a reference signal of the second TRP, a beam level measurement result of a reference signal of a third TRP, or a cell level measurement result of a reference signal of the third TRP; wherein the PCI corresponding to the third TRP is different from the PCI corresponding to the first TRP and the second TRP.

25. The method of any one of claims 18-24, further comprising:

sending wireless link restoration judgment configuration information to the terminal device, wherein the wireless link restoration judgment configuration information includes one or more of the following items: the physical layer link synchronization threshold value used for judging RLF recovery, the physical layer link out-of-step threshold value used for judging RLF recovery, the timer information used for judging RLF recovery, the counter information used for judging RLF recovery, or the synchronization times used for judging RLF recovery.

26. A communication device comprising a memory, a processor, and a transceiver, wherein:

the memory is to store computer instructions;

the transceiver is used for receiving and transmitting information;

the processor is coupled with a memory for invoking computer instructions in the memory to cause the communication device to perform the method of any of claims 1-17.

27. A communication device comprising a memory, a processor, and a transceiver, wherein:

the memory is to store computer instructions;

the transceiver is used for receiving and transmitting information;

the processor, coupled with the memory, to invoke the computer instructions in the memory to cause the communication device to perform the method of any of claims 18-25.

28. A computer-readable storage medium having stored thereon computer-executable instructions, which, when invoked by the computer, are adapted to cause the computer to perform the method of any of claims 1 to 17 or the method of any of claims 18 to 25.