Communication method and apparatus

Abstract

The application discloses a communication method and device, comprising: determining whether a first condition or determining whether a second condition is met, in the case that the first condition is not met or the second condition is met, any one or more of the following is executed; and in the case that the first condition is met or the second condition is not met, any one or more of the following is not executed: detecting a physical layer problem of a terminal device, detecting a radio link failure, initializing RRC connection reconstruction, performing cell reselection, sending an RRC reconstruction request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery. The first condition is used to indicate that the terminal device expects to leave a radio resource control (RRC) connected state, and the second condition is used to indicate that the terminal device does not expect to leave the RRC connected state. The application effectively improves the situation that the behavior of the terminal device is contradictory.

Description

TECHNICAL FIELD

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

[0002] Generally, after detecting a radio link failure, the terminal device can need to initiate a radio resource control (RRC) connection reestablishment procedure. Meanwhile, the terminal device also needs to perform a cell reselection procedure, and send an RRC reestablishment request message to a network device on a cell reselected by the terminal device, and the like, so as to ensure that the terminal device can reestablish an RRC connection with the network device.

[0003] Therefore, how the terminal device detects a radio link failure needs to be solved. SUMMARY

[0004] The present application provides a communication method and device, which effectively improves the situation that behaviors of a terminal device are contradictory.

[0005] In a first aspect, an embodiment of the present application provides a communication method, which is applied to a terminal device or a chip in the terminal device. For ease of description, the method provided by the embodiment of the present application will be described below by taking a terminal device as an example. As shown below, the method comprises the following steps.

[0006] determining that a first condition is not met or determining that a second condition is met, the first condition being used to indicate that the terminal device prefers or expects to leave a radio resource control (RRC) connected state, and the second condition being used to indicate that the terminal device does not prefer to leave the RRC connected state; and performing any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for the beam failure recovery.

[0007] Generally, in the case that the terminal device expects to leave the RRC connected state, the terminal device needs to maintain an RRC connection with a network device for a period of time. However, in this period of time, the terminal device can detect a physical layer problem or detect a radio link failure, and the like. After the terminal device detects the above events, the terminal device needs to reestablish the RRC connection with the network device.

[0008] For example, when the terminal device executes the above steps, if the first condition or the second condition is not added, the terminal device may re-establish the RRC connection with the network device again in the case of expecting to leave the RRC connected state. Thus, not only the behavior of the terminal device is contradictory, but also the resources are wasted. However, in the embodiments of the present application, by adding the judgment condition, such as determining that the first condition is not met or determining that the second condition is met, the terminal device can execute at least one of the following operations in combination with the first condition or the second condition: detecting a physical layer problem, detecting a radio link failure, initializing an RRC connection re-establishment, performing cell reselection, sending an RRC re-establishment request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery. Thus, the situation that the behavior of the terminal device is contradictory is effectively improved, and the situation that the resources are wasted is effectively improved. Meanwhile, the necessity of the terminal device executing the above steps is also improved.

[0009] In a possible implementation, the method further includes: determining that the first condition is met or determining that the second condition is not met; and not performing any one or more of the following operations: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection re-establishment, performing cell reselection, sending an RRC re-establishment request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery.

[0010] In the embodiments of the present application, when the terminal device determines that the first condition is met, such as when the terminal device expects to leave the RRC connected state, the terminal device does not detect a physical layer problem, or does not detect a radio link failure, or does not initialize an RRC connection re-establishment, and the like. Thus, the problem that the terminal device re-establishes the RRC connection with the network device again in the case of expecting to leave the RRC connected state is effectively improved, and the situation that the behavior of the terminal device is contradictory is effectively improved. Moreover, since the terminal device does not execute the above events (such as detecting a physical layer problem, detecting a radio link failure, detecting a beam failure, and the like) when it is determined that the terminal device expects to leave the RRC connected state, the problem that the terminal device initiates unnecessary behavior is effectively improved, the problem that the terminal device wastes power consumption is improved, and the signaling overhead is saved.

[0011] For example, the method provided by the first aspect can also be replaced by:

[0012] determining whether the first condition is met; and determining whether to execute any one or more of the following operations: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection re-establishment, performing cell reselection, sending an RRC re-establishment request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery, according to whether the first condition is met.

[0013] Optionally, the determining whether to perform any one or more of the following according to whether the first condition is met comprises: performing any one or more of the following in the case that the first condition is not met; or not performing any one or more of the following in the case that the first condition is met. It can be understood that any one or more of the above can be understood with reference to the above description, and will not be described in detail here.

[0014] For example, the method provided by the first aspect can also be replaced by:

[0015] determining whether a first condition is met; not performing any one or more of the following in the case that the first condition is met; and performing any one or more of the following in the case that the first condition is not met: detecting a physical layer problem of the terminal device, detecting a radio link failure, initiating RRC connection re-establishment, performing cell reselection, sending an RRC re-establishment request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery.

[0016] It can be understood that the above description of the first aspect is only an example, and various variations of the method provided by the embodiments of the present application are all within the protection scope of the present application.

[0017] In a possible implementation, the first condition comprises any one or more of the following: the terminal device expects to leave the RRC connected state; the terminal device initiates a procedure for leaving the RRC connected state; the terminal device sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and a first timer is running, the first timer being used to control the terminal device to leave the RRC connected state.

[0018] Optionally, the first indication information can also be understood as: being used to indicate that the terminal device intends to leave the RRC connected state; or being used to indicate that the terminal device leaves the RRC connected state; or being used to indicate that the terminal device requests to leave the RRC connected state; or being used to indicate that the terminal device disconnects the RRC connected state; or being used to indicate that the terminal device requests to disconnect the RRC connected state, and the embodiments of the present application are not limited to the specific description of the content indicated by the first indication information.

[0019] Optionally, the first timer can also be understood as a first time length for controlling the terminal device to wait, which is a time length from when the terminal device expects to leave the RRC connected state to when the terminal device leaves the RRC connected state. Optionally, the first time length is a time length from when the terminal device requests to leave the RRC connected state to when the terminal device receives an RRC release message from the network device. Optionally, the first time length is a time length from when the terminal device intends to leave the RRC connected state to when the terminal device receives an RRC release message from the network device. Optionally, the first time length is a time length from when the terminal device expects to leave the RRC connected state to when the terminal device switches to an RRC idle state. Optionally, the first time length is a time length from when the terminal device expects to leave the RRC connected state to when the terminal device switches to an RRC inactive state (may also be referred to as a non-active state). Optionally, the first time length is a time length from when the terminal device sends first indication information to the network device to when an RRC release message is received from the network device. Optionally, the first time length is a time length from when the terminal device sends first indication information to the network device to when the terminal device switches to the RRC idle state or the RRC inactive state. Optionally, the first time length is a time length from when the terminal device initializes to leave the RRC connected state to when the terminal device switches to the RRC idle state or the RRC inactive state, and the like. It can be understood that different descriptions about the specific role of the first time length are only examples, and the specific description of the first time length by the embodiments of the present application is not limited.

[0020] In a possible implementation, the second condition includes any one or more of the following: the terminal device does not expect to leave the RRC connected state; the terminal device does not initialize a process of leaving the RRC connected state; the terminal device does not send first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and a first timer is not running, the first timer being used to control the terminal device to leave the RRC connected state.

[0021] It can be understood that the specific description of the first indication information and the first timer can be referred to the above description, which will not be repeated here.

[0022] In a possible implementation, the first timer is started or restarted in a case where one or more of the following conditions are met: the terminal device initializes a process of leaving the RRC connected state; the terminal device sends first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and the terminal device successfully sends first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state.

[0023] In a possible implementation, the first timer is stopped in a case that an RRC release message sent by the network device is received; or the first timer is stopped in a case that the first timer is timed out.

[0024] It can be understood that the description about starting or restarting, and stopping of the first timer can also be referred to in the following, which is not described in detail here.

[0025] In a possible implementation, the initializing the RRC connection reestablishment comprises: initializing the RRC connection reestablishment in a case that at least one of third conditions is met and at least one of fourth conditions is not met; the third conditions comprise: detecting a radio link failure, a synchronization reconfiguration failure, a new radio (NR) mobility failure, receiving a complete integrity protection check failure from a lower layer, and the RRC connection reconfiguration failure; and the fourth conditions comprise: an access stratum (AS) security being not activated, the AS security being activated but a signaling radio bearer (SRB) 2 and at least one data radio bearer (DRB) not being established, or the SRB 2 not being established in an integrated access and backhaul (IAB) scenario.

[0026] It can be understood that the description about initializing the RRC connection reestablishment can also be referred to in the following, which is not described in detail here.

[0027] In a possible implementation, the detecting the radio link failure comprises: detecting a radio link failure of a master node (MN) or a master cell group (MCG) in dual connectivity (DC); or detecting a radio link failure of a secondary node (SN) or a secondary cell group (SCG) in the DC.

[0028] For example, when detecting a radio link failure of the MN or the MCG in the DC, the terminal device can initialize the RRC connection reestablishment, perform cell reselection, or send an RRC reestablishment request message, and the like. When detecting a radio link failure of the SN or the SCG in the DC, the terminal device can recover the RRC connection through the MN or the MCG, for example, report SCG failure information through a link of the MN or the MCG.

[0029] In a second aspect, an embodiment of the present application provides a communication apparatus for executing the method in the first aspect or any possible implementation manner of the first aspect. The communication apparatus comprises corresponding units for executing the method in the first aspect or any possible implementation manner of the first aspect. For example, the communication apparatus comprises a transceiver unit and a processing unit.

[0030] The processing unit is configured to determine that the first condition is not met or that the second condition is met, the first condition being used to indicate that the terminal device expects to leave a radio resource control (RRC) connected state, and the second condition being used to indicate that the terminal device does not expect to leave the RRC connected state; and the processing unit is further configured to perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for the beam failure recovery.

[0031] Optionally, the processing unit can perform the cell reselection or send the RRC reestablishment request message through the transceiver unit, and the embodiments of the present application do not limit specific manners of the transceiver unit and the processing unit.

[0032] In a possible implementation manner, the processing unit is further configured to determine that the first condition is met or that the second condition is not met; and not perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for the beam failure recovery.

[0033] Optionally, the processing unit can be further understood as follows: the processing unit can determine whether the first condition or the second condition is met; and then determine whether to perform the detecting a physical layer problem, or the detecting a radio link failure, or the initializing an RRC connection reestablishment, according to whether the first condition or the second condition is met.

[0034] In a possible implementation manner, the first condition comprises any one or more of the following: the terminal device expects to leave the RRC connected state; the terminal device initializes a procedure of leaving the RRC connected state; the terminal device sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and a first timer is running, the first timer being used to control the terminal device to leave the RRC connected state.

[0035] In a possible implementation, the second condition comprises any one or more of the following: the terminal device does not expect to leave the RRC connected state; the terminal device does not initiate a procedure of leaving the RRC connected state; the terminal device does not send first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and a first timer is not running, the first timer being used to control the terminal device to leave the RRC connected state.

[0036] In a possible implementation, the processing unit is further configured to start or restart the first timer in a case where one or more of the following conditions are met: the terminal device initiates a procedure of leaving the RRC connected state; the terminal device sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and the terminal device successfully sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state.

[0037] In a possible implementation, the processing unit is further configured to stop the first timer in a case where an RRC release message sent by a network device is received; or, the processing unit is further configured to stop the first timer in a case where the first timer times out.

[0038] In a possible implementation, the processing unit is specifically configured to initiate the RRC connection reestablishment in a case where at least one of third conditions is met and at least one of fourth conditions is not met.

[0039] The third conditions comprise: detecting a radio link failure, detecting a synchronization reconfiguration failure, detecting a failure in moving from a new radio (NR), detecting a failure in receiving integrity protection verification from a lower layer, detecting a failure in the RRC connection reconfiguration; and the fourth conditions comprise: an access stratum (AS) security being not activated, the AS security being activated but a signaling radio bearer (SRB2) and at least one data radio bearer (DRB) not being established, or the SRB2 not being established in an integrated access and backhaul (IAB) scenario.

[0040] In a possible implementation, the processing unit is specifically configured to detect a radio link failure of a master node (MN) or a master cell group (MCG) in dual connectivity (DC); or, detect a radio link failure of a secondary node (SN) or a secondary cell group (SCG) in dual connectivity (DC).

[0041] By way of example, the communication apparatus can include a terminal device or a chip in a terminal device.

[0042] In a third aspect, an embodiment of the present application provides a communication apparatus, comprising a processor, configured to execute the method in the first aspect or any possible implementation manner of the first aspect. Alternatively, the processor is configured to execute a program stored in the memory, and the program is configured to execute the method in the first aspect or any possible implementation manner of the first aspect when the program is executed.

[0043] In the process of executing the method, the process of receiving information in the method can be understood as the process that the processor receives the input information. When the processor receives the input information, the transceiver receives the information and inputs it to the processor. Further, after the transceiver receives the information, the information can need to be processed before being input to the processor.

[0044] For the transmission, sending and receiving operations of the processor, if no special description is given, or if it does not conflict with the actual role or inherent logic in the related description, it can be more generally understood as the processor output and receiving, inputting and the like, rather than the transmission, sending and receiving operations directly performed by the radio frequency circuit and the antenna.

[0045] In the implementation process, the processor can be a processor specially used for executing the method, or a processor executing the computer instructions in the memory to execute the method, such as a general processor. The memory can be a non-transitory memory, such as a read only memory (ROM), which can be integrated on the same chip with the processor, or can be respectively arranged on different chips. The type of the memory and the arrangement mode of the memory and the processor are not limited in the embodiments of the present application.

[0046] In a possible implementation manner, the memory is located outside the communication apparatus.

[0047] In a possible implementation manner, the memory is located inside the communication apparatus.

[0048] In the embodiments of the present application, the processor and the memory can also be integrated in one device, such as the processor and the memory can also be integrated together.

[0049] In a possible implementation manner, the communication apparatus further comprises a transceiver, configured to receive a signal or send a signal.

[0050] In the embodiments of the present application, the communication apparatus can comprise a terminal device or a chip in a terminal device.

[0051] Fourthly, embodiments of this application provide a communication device, which includes a logic circuit and an interface, wherein the logic circuit and the interface are coupled; the logic circuit is configured to determine whether a first condition is not met or to determine whether a second condition is met; and is further configured to perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initiating RRC connection reconstruction, performing cell reselection, sending an RRC reconstruction request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery.

[0052] It is understood that the above logic circuit can send RRC reconstruction request messages through the interface, etc. The specific function of the interface is not limited in the embodiments of this application.

[0053] It is understood that the description of the first or second condition, the first indication information, the first timer, etc., can be referred to the description of the first aspect above; or, reference can also be made to the various embodiments shown below, which will not be described in detail here.

[0054] Fifthly, embodiments of this application provide a computer-readable storage medium for storing a computer program that, when run on a computer, causes the methods shown in the first aspect or any possible implementation thereof to be executed.

[0055] Sixthly, embodiments of this application provide a computer program product comprising a computer program that, when run on a computer, causes the methods shown in the first aspect or any possible implementation thereof to be executed.

[0056] For example, the computer program product described above may also be referred to as a computer program, whereby, when the computer program is run on a computer, the method shown in the first aspect or any possible implementation thereof is executed. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of a communication system provided in an embodiment of this application;

[0058] Figure 2a and Figure 2b This is a flowchart illustrating a method for a UE to leave the RRC connection state, as provided in an embodiment of this application.

[0059] Figures 3a to 3c This is a flowchart illustrating a communication method provided in an embodiment of this application;

[0060] Figure 4 This is a schematic diagram of a dual-connection scenario provided in an embodiment of this application;

[0061] Figure 5ais a schematic diagram of a user plane protocol stack of a terminal device provided by an embodiment of the present application;

[0062] Figure 5b is a schematic diagram of a control plane protocol stack of a terminal device provided by an embodiment of the present application;

[0063] Figure 6 is a schematic diagram of a method for indicating measurement relaxation provided by an embodiment of the present application;

[0064] Figures 7 to 9 is a schematic diagram of a structure of a communication apparatus provided by an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described below with reference to the drawings.

[0066] The terms "first" and "second" and the like in the specification of the present application, claims, and drawings are used only to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device, etc. including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device, etc.

[0067] In this document, "embodiment" means that the specific features, structures, or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment is referred to, nor does it mean that the embodiments are mutually exclusive or alternative to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0068] In the present application, "at least one" means one or more, "multiple" means two or more, "at least two" means two or three and more, and "and / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases of only A, only B, and A and B at the same time, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of these items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c".

[0069] The method provided in the application can be applied to various communication systems, for example, can be an internet of things (IoT) system, a narrow band internet of things (NB-IoT) system, a long term evolution (LTE) system, a 5th-generation (5G) communication system, and a new communication system (such as 6G) in future communication development.

[0070] The technical solutions provided in the application can also be applied to machine type communication (MTC), long term evolution-machine (LTE-M), device-to-device (D2D) network, machine-to-machine (M2M) network, internet of things (IoT) network or other network. The IoT network may, for example, include a vehicle network. In the vehicle network system, the communication mode is collectively referred to as vehicle-to-everything (V2X, X can represent any thing), for example, the V2X can include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication or vehicle-to-network (V2N) communication, etc. For example, the method embodiments shown below can be applied to the V2X system. Figure 1 In the method embodiments shown below, the terminal device and the terminal device can communicate through D2D technology, M2M technology or V2X technology, etc.

[0071] Figure 1 FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the application. The method embodiments shown below can be applied to the communication system shown in FIG. 1, and details are not described below. Figure 1

[0072] For example, the communication system can include at least one access network device and at least one terminal device.

[0073] ​Exemplarily, the access network device can be a next generation node B (gNB), a next generation evolved node B (ng-eNB) (which can be simply referred to as an eNB), or an access network device in future 6G communication, etc. The access network device can be any kind of device with wireless transceiver function, including but not limited to the base stations shown above. The base station can also be a base station in future communication systems, such as a sixth generation communication system. Optionally, the access network device can be an access node in a wireless fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, etc. Optionally, the access network device can be a wireless controller in a cloud radio access network (CRAN) scenario. Optionally, the access network device can be a wearable device or a vehicle-mounted device, etc. Optionally, the access network device can also be a small station, a transmission reception point (TRP) (or also referred to as a transmission point), etc. It can be understood that the access network device can also be a base station in a future evolved public land mobile network (PLMN), etc.

[0074] Exemplarily, the terminal device can also be referred to as a user equipment (UE), a terminal, etc. The terminal device is a kind of device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can also be deployed on water, such as a ship, etc.; can also be deployed in the air, for example, deployed on an airplane, a balloon or a satellite, etc. The terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical treatment, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. It can be understood that the terminal device can also be a terminal device in future 6G network or a terminal device in future evolved PLMN, etc.

[0075] It can be understood that the terminal device shown in the present application can not only include a vehicle (such as a whole vehicle) in the vehicle network, but also include a vehicle-mounted device or a vehicle-mounted terminal (including a T-box or a host in the vehicle network system) in the vehicle network, and the like. The present application does not limit the specific form of the terminal device applied to the vehicle network. For ease of description, the following will take the terminal device as an example of UE to introduce the method involved in the present application.

[0076] Figure 1 The communication system shown includes one base station and six UEs such as UE1 to UE6 in Figure 1 , and one core network device. It can be understood that the specific description of the UE and the base station can be referred to the above, which will not be repeated here. It should be understood that Figure 1 An exemplary base station and six UEs are shown, as well as the communication links between the communication devices. Alternatively, the communication system can include multiple base stations, and each base station can include other number of UEs within its coverage, for example, more or less UEs, and the like, which are not limited by the present application. Alternatively, Figure 1 The communication system shown can also include a core network device, such as an access and mobility management function (AMF), and the like, which are not limited by the present application

[0077] The following introduces the terms involved in the present application:

[0078] 1. Multi-card terminal

[0079] The multi-card terminal refers to a terminal that simultaneously has more than or equal to two telephone cards (SIM or USIM cards). For example, the telephone card includes a subscriber identification module (SIM) and / or a universal subscriber identity module (USIM). The multi-card terminal can register to different networks, such as different access network devices and / or different core network devices, by using more than or equal to two telephone cards. Therefore, one telephone card corresponds to one UE, and multiple cards in the multi-card terminal can be understood as multiple UEs.

[0080] It can be understood that the methods shown in the present application can be applied not only to a terminal with one telephone card, but also to a terminal with two or more telephone cards.

[0081] 2. Radio link failure (RLF)

[0082] A wireless link failure can occur when the quality of the wireless link deteriorates. For example, the UE can be considered to have detected a wireless link failure by detecting one or more of the following events.

[0083] A physical layer problem can occur when the timer T310 expires.

[0084] For example, if the UE receives N310 consecutive “out-of-sync” indications for a special cell (SpCell) from a lower layer and none of the timers T300, T301, T304, T311, T316, T319 are running, the UE starts the timer T310 for the corresponding special cell. The special cell includes a primary cell (PCell) and a primary secondary cell (PSCell).

[0085] For example, if the UE receives N310 consecutive “out-of-sync” indications for a source special cell (SpCell) from a lower layer and the timer T304 is not running, the UE starts the timer T310 for the corresponding source special cell in the case where any dual active protocol stack (DAPS) bearer is configured.

[0086] The timer T310 expires when a physical layer problem occurs, and the UE can be considered to have detected a wireless link failure at this time.

[0087] It can be understood that specific descriptions of N310, T300, T301, T304, T311, T316, T319 can also be referred to in related standards or protocols, and the present application does not make a detailed description.

[0088] B. The UE does not switch in time after reporting the measurement, for example, the timer T312 expires.

[0089] For example, the measurement reporting shown herein can be understood as the UE reporting a measurement report, and the switching herein can be understood as the UE switching from one cell to another cell. For example, when the quality of the wireless link deteriorates, the UE can not be able to switch in time. Therefore, when the UE reports a measurement report and does not switch in time, it can indicate a wireless link failure.

[0090] C. Random access problem is detected and none of the timers T300, T301, T304, T311, T316, T319 are running.

[0091] D. An indication of a maximum number of retransmission is received at the radio link control (RLC) layer.

[0092] E. A consistent medium access control (MAC) layer uplink listen before talk (LBT) failure indication is received and timer T304 is not running.

[0093] It can be understood that, in the case of detecting one or more of the above events, the UE can further determine whether the following condition is met, optionally:

[0094] F. If the indication is from the RLC layer (e.g. the above indication of a maximum number of retransmission at the RLC layer), and carrier aggregation (CA) duplication is configured and activated, and the allowed serving cells parameter (e.g. allowedServingCells) of the corresponding logical channel only includes secondary cells. If the above condition F is not met, it is considered that radio link failure is detected. Exemplarily, not meeting the above condition can include one or more of the following: the indication is not from the RLC layer, CA duplication is not configured, CA duplication is not activated, the allowed serving cells parameter of the corresponding logical channel does not only include secondary cells.

[0095] Optionally, in the case of meeting any one or more of the above conditions A to E, the UE can consider that radio link failure is detected. Optionally, in the case of meeting any one or more of the above conditions A to E, and not meeting the above condition F, the UE can consider that radio link failure is detected. It can be understood that the above-mentioned method for the UE to detect radio link failure is only an example, and for specific description, reference can be made to relevant standards or protocols, etc., which will not be described one by one in the present application.

[0096] It is noted that in dual connectivity (DC) scenario, if the above event happens in master base station or master node (MN) or master cell group (MCG), it can be considered that the MN or MCG has a radio link failure. If the above event happens in secondary base station or secondary node (SN) or secondary cell group (SCG), it can be considered that the SN or SCG has a radio link failure. For example, if DC is not configured, the special cell includes a primary cell (PCell), wherein the PCell is a cell of the MN or MCG. If DC is configured, the special cell includes a primary cell (PCell) and a primary secondary cell (PSCell), wherein the PCell is a cell of the MN or MCG, and the PSCell is a cell of the SN or SCG.

[0097] 3. Initialize radio resource control (RRC) connection reestablishment

[0098] After the UE considers that the radio link failure is detected, the UE can need to initiate a connection reestablishment procedure. Alternatively, after the UE considers that the radio link failure is detected, the UE can further determine whether the following conditions are met:

[0099] G. Access stratum (AS) security is not activated.

[0100] H. Access stratum security is activated but signaling radio bearer (SRB) 2 and at least one data radio bearer (DRB) are not established or SRB 2 is not established in an integrated access and backhaul (IAB) scenario.

[0101] If any of the above conditions G or H is not met, or the above conditions G and H are not met, the UE initializes the RRC connection reestablishment (which can also be referred to as the UE needs to initiate a connection reestablishment procedure). If the UE meets the above conditions G and / or H, the UE does not initialize the RRC connection reestablishment (which can also be referred to as the UE does not initiate a connection reestablishment).

[0102] After the UE determines that the RRC connection reestablishment needs to be initialized, a series of behaviors and processes need to be performed, such as a cell reselection process, sending an RRC reestablishment request message to the network device on the cell reselected to, and the like, so as to reestablish the RRC connection with the network device.

[0103] 4. Time length T

[0104] For a multi-card terminal, there can be a case that the multi-card terminal can only communicate on one card at the same time. For example, the multi-card terminal is currently communicating with the network device A on card 1, and at this time, card 2 also has a service arriving (network paging card 2, such as the network device B sending a paging message to card 2), and the multi-card terminal can select to disconnect the communication between card 1 and the network device A and establish the communication between card 2 and the network device B. It can be understood that the multi-card terminal shown here is only an example, and the method provided by the present application is also applicable to a terminal that is not a multi-card terminal.

[0105] For example, if the UE expects to disconnect the connection with the network device (such as the network device A described above), such as leaving the RRC connected state and entering the RRC idle state or the RRC inactive state (also referred to as the RRC non-activated state), the UE can send first indication information to the network device. The first indication information can be referred to as release indication information or indication information indicating the desire to leave the RRC connected state, and the specific name of the first indication information is not limited in the present application. For ease of description, the method provided by the present application will be described below by taking the first indication information as the release indication information.

[0106] Optionally, the release indication information is used to indicate the desire or intention to leave the RRC connected state. Optionally, the release indication information can indicate the desire to switch from the RRC connected state to the RRC idle state or the RRC inactive state. Optionally, the release indication information can be used to indicate the RRC state to which the switch is desired, and the RRC state includes the RRC idle state or the RRC inactive state.

[0107] After the UE sends the release indication information, or after the UE expects to disconnect the RRC connected state (which is only an example), the UE needs to remain in the RRC connected state under the network device and wait for a time length T, and the following cases exist:

[0108] Case 1, see Figure 2a , Figure 2ais a method flowchart provided by an embodiment of the present application for a UE leaving an RRC connected state. If the UE receives an RRC release message sent by a network device within a time length T, the RRC release message can include information indicating that the UE is to be switched to an RRC idle state or an RRC inactive state, or the RRC release message includes information indicating an RRC idle state or an RRC inactive state. Then, the UE is switched to the corresponding RRC state according to the indication of the network device in the RRC release message.

[0109] Case 2, see Figure 2b , Figure 2b is another method flowchart provided by an embodiment of the present application for a UE leaving an RRC connected state. If the UE does not receive an RRC release message sent by a network device within a time length T, the UE can automatically be switched to an RRC idle state or an RRC inactive state. Optionally, the UE is automatically switched to an RRC idle state. That is, when the UE automatically switches an RRC state, it can be automatically switched to an RRC idle state, rather than an RRC inactive state. Optionally, the UE is automatically switched to a predetermined RRC state, which can be a state predefined in a protocol or standard, or preconfigured by a network device, etc., and the present application does not limit the configuration method of the predetermined RRC state. Optionally, if the network device has preconfigured parameters for an RRC inactive state, the UE is automatically switched to an RRC inactive state. That is, if the network device has sent configuration information of an RRC inactive state to the UE, the UE can be automatically switched to an RRC inactive state, otherwise the UE is automatically switched to an RRC idle state.

[0110] It can be understood that the time length T shown in the present application can also be referred to as a time length T, etc., and the present application does not limit the specific name of the time length T. For example, the time length T can be controlled by a timer. For example, the timer can be referred to as a timer for controlling the UE leaving an RRC connected state, or a timer for controlling the UE disconnecting an RRC connected state, or a timer for counting the UE switching from an RRC connected state to an RRC idle state or an RRC inactive state, or a counter for controlling the UE waiting for a time length T, etc. That is, after the UE expects or intends to leave an RRC connected state, the timer needs to be started, and during the running of the timer, the UE maintains an RRC connection with the network device and listens to an RRC release message. For example, if the UE still does not receive the RRC release message in the case of the timer expiring, the UE is automatically switched to an RRC idle state or an RRC inactive state. For example, if the UE receives the RRC release message during the running of the timer, the UE can be switched to an RRC idle state or an RRC inactive state according to the indication of the RRC release message.

[0111] It can be understood that the description of the time length T here is only an example, and other descriptions of the time length T can also refer to the method shown below in this application, which will not be described one by one here.

[0112] In the above time length T, the UE can detect a radio link failure. For example, according to the judgment of part or all of the conditions A to H described above, the UE can need to initiate a connection reestablishment process, thereby performing a series of behaviors and processes such as a cell reselection process, sending an RRC reestablishment request message to the network device on the cell reselected, and reestablishing an RRC connection with the network device. However, the UE needs to wait for the time length T, which is because the UE itself expects or intends to disconnect the connection with the network device, and the connection reestablishment process is to restore the connection with the network device, thereby causing the UE to reestablish the RRC connection with the network device in the case where the UE expects or intends to disconnect the RRC connection with the network device, which not only makes the behavior of the UE contradictory, but also causes the UE to waste power consumption and signaling.

[0113] In view of this, the present application provides a communication method and device, which can effectively improve the problem of reestablishing the RRC connection with the network device in the case where the UE expects or intends to disconnect the RRC connection with the network device, effectively improve the case where the UE wastes power consumption or signaling, and improve the UE to initiate unnecessary behaviors (such as initiating a connection reestablishment process). Thus, the power consumption loss of the UE is effectively saved, and the signaling overhead is saved.

[0114] In this application, for example, when the UE expects (expect, prefer) or intends or indicates to leave the RRC connected state, or when the UE initiates (or triggers) the process of leaving the RRC connected state, or when the UE sends release indication information to the network device, or when the first timer is running, the UE is not allowed to detect a radio link failure, or the UE is not allowed to initiate a connection reestablishment process, or the UE is not allowed to perform a cell reselection process in the connection reestablishment process, or the UE is not allowed to perform a process of sending an RRC reestablishment request message to the network device in the connection reestablishment process, or the UE is not allowed to detect a beam failure, or the UE is not allowed to perform a beam failure recovery, or the UE is not allowed to initiate a random access for beam failure recovery.

[0115] In this application, exemplary, when the UE does not expect or does not intend or does not indicate to leave the RRC connected state, or the UE does not initialize (or does not trigger) the process of leaving the RRC connected state, or when the UE does not send release indication information to the network device, or when the first timer is not running, the UE can detect a radio link failure, or the UE can initiate a connection reestablishment procedure, or the UE can perform a cell reselection procedure in the connection reestablishment procedure, or the UE can perform a process of sending an RRC reestablishment request message to the network device in the connection reestablishment procedure; or the UE can detect a beam failure, or the UE can perform a beam failure recovery, or the UE can initiate a random access for beam failure recovery.

[0116] It can be understood that in the above cases, the UE needs to determine whether a radio link failure has been detected, or whether a connection reestablishment procedure needs to be initiated, or whether a cell reselection procedure in the connection reestablishment procedure needs to be performed, etc. according to relevant conditions (such as some or all of the conditions A to H described above).

[0117] The following describes in detail the communication method provided by the present application.

[0118] Figure 3a is a flowchart of a communication method provided by an embodiment of the present application, as shown in Figure 3a , the method comprises:

[0119] 301, the terminal device determines that the first condition is not met, or determines that the second condition is met.

[0120] Exemplary, the first condition is used to indicate that the terminal device expects to leave the RRC connected state. The first condition includes any one or more of the following: the terminal device expects to leave the RRC connected state; the terminal device intends to leave the RRC connected state; the terminal device indicates to leave the RRC connected state; the terminal device requests to leave the RRC connected state; the terminal device requests to disconnect the RRC connection with the network device (such as the access network device described above); the terminal device intends to disconnect the RRC connection with the network device; the terminal device initializes the process of leaving the RRC connected state; the terminal device sends first indication information to the network device, the first indication information is used to indicate that the terminal device expects to leave the RRC connected state; the terminal device requests to switch from the RRC connected state to the RRC idle state; the terminal device requests to switch from the RRC connected state to the RRC inactive state; the first timer is running, and the first timer is used to control the terminal device to leave the RRC connected state. It can be understood that the above description of the first condition is only an example, and any method that can indicate that the terminal device expects to leave the RRC connected state belongs to the scope of the first condition shown in the embodiments of the present application.

[0121] Exemplarily, the second condition is used to indicate that the terminal device does not expect to leave the RRC connected state. The second condition includes any one or more of the following: the terminal device does not expect to leave the RRC connected state; the terminal device does not intend to leave the RRC connected state; the terminal device does not indicate to leave the RRC connected state; the terminal device does not request to leave the RRC connected state; the terminal device does not request to disconnect the RRC connection with the network device; the terminal device does not intend to disconnect the RRC connection with the network device; the terminal device does not initialize a procedure of leaving the RRC connected state; the terminal device does not send first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; the terminal device does not request to switch from the RRC connected state to the RRC idle state; the terminal device does not request to switch from the RRC connected state to the RRC inactive state; and a first timer is not running, the first timer being used to control the terminal device to leave the RRC connected state. It can be understood that the above description of the second condition is only an example, and any method capable of indicating that the terminal device does not expect to leave the RRC connected state falls within the scope of the second condition described in the embodiments of the present application.

[0122] Optionally, the first indication information described above can also be understood as: being used to indicate that the terminal device intends to leave the RRC connected state; or being used to indicate that the terminal device leaves the RRC connected state; or being used to indicate that the terminal device requests to leave the RRC connected state; or being used to indicate that the terminal device disconnects the RRC connection; or being used to indicate that the terminal device requests to disconnect the RRC connection, and the like. The embodiments of the present application do not limit the specific description of the content indicated by the first indication information. Exemplarily, the first indication information can also be referred to as release indication information or indication information indicating that the terminal device expects to leave the RRC connected state, and the like. The embodiments of the present application do not limit the specific name of the first indication information. For the convenience of understanding, the communication method provided by the embodiments of the present application will be described below by taking the release indication information as an example.

[0123] Optionally, the first timer can also be understood as a first time length for controlling the terminal device to wait, which is a time length from when the terminal device expects to leave the RRC connected state to when the terminal device leaves the RRC connected state. Optionally, the first time length can be understood as a time length that the terminal device needs to keep the RRC connected state with the network device and wait after the terminal device expects to leave the RRC connected state. Optionally, the first time length can be understood as a time length from when the terminal device requests to leave the RRC connected state to when the terminal device receives an RRC release message from the network device. Optionally, the first time length can be understood as a time length from when the terminal device intends to leave the RRC connected state to when the terminal device receives an RRC release message from the network device. Optionally, the first time length can be understood as a time length from when the terminal device expects to leave the RRC connected state to when the terminal device switches to an RRC idle state. Optionally, the first time length can be understood as a time length from when the terminal device expects to leave the RRC connected state to when the terminal device switches to an RRC inactive state (also referred to as a non-active state). Optionally, the first time length can be understood as a time length from when the terminal device sends first indication information to the network device to when an RRC release message is received from the network device. Optionally, the first time length can be understood as a time length from when the terminal device sends first indication information to the network device to when the terminal device switches to the RRC idle state or the RRC inactive state. Optionally, the first time length can be understood as a time length from when the terminal device initiates to leave the RRC connected state to when the terminal device switches to the RRC idle state or the RRC inactive state, and the like. Optionally, the first time length can also be understood as a time length from when the terminal device successfully sends first indication information to the network device to when an RRC release message is received from the network device. Optionally, the first time length can also be understood as a time length from when the terminal device successfully sends first indication information to the network device to when the terminal device switches to the RRC idle state or the RRC inactive state. The terminal device successfully sending first indication information to the network device can be understood as that the terminal device has received an acknowledgement or the like from the network device, and embodiments of the present application do not limit how the terminal device knows that the network device successfully receives the first indication information.

[0124] It can be understood that different descriptions of the specific role of the first time length are only examples, and embodiments of the present application do not limit the specific description of the first time length.

[0125] In embodiments of the present application, the starting or restarting of the first timer and the stopping of the first timer can be as follows:

[0126] For example, the first timer is started or restarted when one or more of the following conditions are met:

[0127] The terminal device initializes a procedure of leaving an RRC connected state; the terminal device sends first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; the terminal device successfully sends the first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and the terminal device requests to leave the RRC connected state.

[0128] For example, the first timer is stopped upon receiving the RRC release message sent by the network device, or the first timer is stopped upon timing out.

[0129] It can be understood that the specific description about the starting or restarting of the first timer and the stopping of the first timer can be referred to the following description, and will not be described in detail here.

[0130] 302. The terminal device performs any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery.

[0131] For example, when the terminal device determines that the first condition is not met, the terminal device can detect a physical layer problem. Alternatively, it can also be understood that when the terminal device determines that the first condition is not met, the terminal device considers that a physical layer problem is detected according to that the terminal device does not meet the first condition and meets a condition of occurrence of the physical layer problem. It can be understood that the present application does not limit the order of determining that the first condition is met and determining that the condition of occurrence of the physical layer problem is met. Alternatively, the terminal device can first determine whether the first condition is met, and then determine whether the condition of occurrence of the physical layer problem is met. Alternatively, the terminal device can first determine whether the condition of occurrence of the physical layer problem is met, and then determine whether the first condition is met. It can be understood that the above description about the physical layer problem and the first condition is also applicable to the description about the physical layer problem and the second condition, which will not be described in detail here. For ease of description, the following will take the first condition as an example to describe the method provided by the present application.

[0132] For example, when the terminal device determines that the first condition is not met, the terminal device can detect a radio link failure. Similarly, the present application does not limit the order of determining whether the first condition is met by the terminal device and determining whether the condition of radio link failure is met. Alternatively, the radio link failure shown by the present application can occur in the MN or the MCG in the DC, or can occur in the SN or the SCG in the DC. Figure 4 is a schematic diagram of a dual connectivity scenario provided by the present application. As shown in Figure 4As shown, the UE can be connected to two base stations, such as the MN and the SN. As an example, when detecting that the MN or the MCG in the DC has a radio link failure, the terminal device can initialize RRC connection reestablishment, perform cell reselection, or send an RRC reestablishment request message, etc. When the SN or the SCG in the DC has a radio link failure, the terminal device can recover the RRC connection through the MN or the MCG, for example, report SCG failure information on the link of the MN or the MCG. It can be understood that Figure 4 The dual connectivity shown is only an example, and embodiments of the present application are not limited thereto.

[0133] As an example, when the terminal device determines that the first condition is not met, the terminal device can initialize RRC connection reestablishment. Optionally, when the third condition is met and the fourth condition is not met, the terminal device determines whether the first condition is met. When the first condition is not met, the RRC connection reestablishment is initialized. Optionally, the terminal device can determine whether the first condition is met, and when the first condition is met, determine whether the third condition is met and whether the fourth condition is met; when the third condition is met and the fourth condition is not met, the RRC connection reestablishment is initialized. Optionally, the terminal device can first determine whether the third condition is met, and then when the third condition is met, determine whether the first condition and the fourth condition are met, and when neither the first condition nor the fourth condition is met, the RRC connection reestablishment is initialized. It can be understood that the order of determining the various conditions shown above is only an example, and embodiments of the present application are not limited thereto. As an example, the third condition includes at least one of the following: detecting a radio link failure, detecting a synchronization reconfiguration failure, detecting a failure to move from NR, receiving a lower layer integrity protection check failure, and detecting an RRC connection reconfiguration failure. The fourth condition includes: AS security is not activated, AS security is activated but SRB2 and at least one DRB are not established, or SRB2 is not established in an IAB scenario. It can be understood that the specific description of the third condition or the fourth condition can be referred to below, and will not be described one by one here.

[0134] As an example, when the terminal device determines that the first condition is not met, the terminal device can perform cell reselection. It can be understood that after the terminal device initializes the RRC connection reestablishment, the terminal device can determine whether the first condition is met, and if the first condition is not met, the terminal device can perform cell reselection. Therefore, the description of the first condition and cell reselection can be exemplarily referred to the description of the first condition and the initialization of the RRC connection reestablishment described above, or can also be referred to the embodiments shown below, and will not be described one by one here.

[0135] Exemplarily, the terminal device determines that the first condition is not satisfied, and the terminal device can send the RRC reestablishment request message. Optionally, the terminal device can determine whether the third condition and the fourth condition are satisfied, in a case that the third condition is satisfied and the fourth condition is not satisfied, it is determined that the first condition is not satisfied, and then whether the RRC reestablishment request message is sent is determined according to whether the condition of sending the RRC reestablishment request message is satisfied. Optionally, in a case that the third condition is satisfied and the fourth condition is not satisfied, if the cell reselected to is the cell where the radio link failure occurs and the first condition is not satisfied, the RRC reestablishment request message is sent to the network device. Optionally, in a case that the third condition is satisfied and the fourth condition is not satisfied, the terminal device determines whether the first condition is satisfied, and if the first condition is not satisfied, it is determined whether the cell reselected to is the cell where the radio link failure occurs. If the cell reselected to is the cell where the radio link failure occurs, the RRC reestablishment request message is sent to the network device. Optionally, in a case that the third condition is satisfied and the fourth condition is not satisfied, the terminal device determines whether the cell reselected to is the cell where the radio link failure occurs. If the cell reselected to is the cell where the radio link failure occurs, it is determined whether the first condition is satisfied, and if the first condition is not satisfied, the RRC reestablishment request message is sent to the network device. It can be understood that the order of the above steps is not limited in the embodiments of the present application.

[0136] Exemplarily, the terminal device determines that the first condition is not satisfied, and the terminal device can detect the beam failure. Generally, the terminal device monitors the control channel quality, and if it is continuously lower than a certain threshold and lasts for a certain time, it is considered that the beam failure is detected. Therefore, in the embodiments of the present application, in a case that the terminal device determines that the first condition is not satisfied, and in a case that the control channel quality is lower than a certain threshold and lasts for a certain time, it is considered that the beam failure is detected.

[0137] Exemplarily, the terminal device determines that the first condition is not satisfied, and the terminal device can perform the beam failure recovery. Optionally, the terminal device can determine whether the first condition is satisfied in a case that the beam failure is detected, and perform the beam failure recovery in a case that the first condition is not satisfied.

[0138] Exemplarily, the terminal device determines that the first condition is not satisfied, and the terminal device can initiate the random access for the beam failure recovery. Optionally, in a case that the terminal device needs to perform the beam failure recovery, it is determined whether the first condition is satisfied, and the random access for the beam failure recovery is initiated in a case that the first condition is not satisfied.

[0139] It can be understood that the embodiments of the present application do not limit other judgment conditions for the UE to detect beam failure, perform beam failure recovery, or initiate random access for beam failure recovery. It can be understood that the above-mentioned various explanations are only examples, and for specific explanations, reference can be made to the various embodiments shown below.

[0140] In the embodiments of the present application, by adding judgment conditions, such as determining that the first condition is not met, or determining that the second condition is met, the terminal device can combine the first condition or the second condition to perform at least one of the following: detecting a physical layer problem, detecting a radio link failure, initializing RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting beam failure, performing beam failure recovery, and initiating random access for beam failure recovery. The problem of reestablishing the RRC connection with the network device when the terminal device expects to leave the RRC connection with the network device is effectively improved. Thus, the behavior contradiction of the terminal device is effectively improved, and the resource waste is effectively improved.

[0141] The embodiments of the present application also provide another communication method, which includes: a terminal device determining that the first condition is met or determining that the second condition is not met; and not performing any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting beam failure, performing beam failure recovery, and initiating random access for beam failure recovery.

[0142] The following still takes the first condition as an example to illustrate the method provided by the embodiments of the present application.

[0143] For example, the terminal device determines that the first condition is met, and the terminal device can not detect a physical layer problem. Optionally, if the terminal device determines that the first condition is met, it no longer determines whether the condition of a physical layer problem occurs. Optionally, the terminal device can determine whether the first condition is met under the condition that a physical layer problem occurs; if the first condition is met, the terminal device no longer detects whether a physical layer problem occurs. Thus, the terminal device no longer detects one or more of a radio link failure, initialization of RRC connection reestablishment, cell reselection, and sending of an RRC reestablishment request message.

[0144] For example, the terminal device determines that the first condition is met, and the terminal device does not detect a radio link failure.

[0145] For example, the terminal device determines that the first condition is met, and the terminal device does not initialize the RRC connection reestablishment. Optionally, the terminal device determines whether the first condition is met when the third condition is met and the fourth condition is not met. When the first condition is met, the RRC connection reestablishment is not initialized. Optionally, the terminal device can determine whether the first condition is met, and when the first condition is met, the terminal device does not need to determine whether the third condition is met and whether the fourth condition is met, so that the terminal device does not initialize the RRC connection reestablishment. Optionally, the terminal device can first determine whether the third condition is met, and then when the third condition is met, determine whether the first condition and the fourth condition are met, and when the first condition is met and the fourth condition is not met, or when the first condition is met and the fourth condition is met, the RRC connection reestablishment is not initialized. Thus, the terminal device does not perform one or more of the cell reselection and the sending of the RRC reestablishment request message. It can be understood that the order of determining the conditions shown above is only an example, and the embodiments of the present application are not limited thereto. It can be understood that the specific description of the third condition or the fourth condition can refer to the above or the below, which will not be described here.

[0146] For example, the terminal device determines that the first condition is met, and the terminal device does not perform the cell reselection. Optionally, the terminal device can initialize the RRC connection reestablishment when the third condition is met and the fourth condition is not met. Then, it is determined whether the first condition is met, and if the first condition is met, the cell reselection is not performed. Further, the terminal device also does not need to send the RRC reestablishment request message to the network device.

[0147] For example, the terminal device determines that the first condition is met, and the terminal device does not send the RRC reestablishment request message. Optionally, the terminal device performs the cell reselection, and then determines whether the first condition is met. If the first condition is met, and the cell reselected to is the cell where the radio link failure occurs (or the cell reselected to is not the cell where the radio link failure occurs), the terminal device does not send the RRC reestablishment request message to the network device. Optionally, the terminal device performs the cell reselection, and then determines whether the first condition is met when the cell reselected to is the cell where the radio link failure occurs. If the first condition is met, the RRC reestablishment request message is not sent to the network device.

[0148] For example, the terminal device determines that the first condition is met, and the terminal device does not detect a beam failure. Optionally, the terminal device determines that the first condition is met, and the terminal device no longer monitors a beam quality. Optionally, the first condition is determined to be met when a monitored control channel quality is lower than a certain threshold for a period of time. If the first condition is met, the terminal device no longer detects whether a beam fails. Thus, the terminal device no longer performs a beam failure recovery and initiates a random access for the beam failure recovery. It can be understood that the present application does not limit the specific value of the certain threshold.

[0149] For example, the terminal device determines that the first condition is met, and the terminal device does not perform a beam failure recovery. Optionally, the terminal device determines whether the first condition is met when a beam failure is detected. If the first condition is met, the terminal device no longer performs a beam failure recovery process.

[0150] For example, the terminal device determines that the first condition is met, and the terminal device does not initiate a random access for a beam failure recovery.

[0151] It can be understood that the above descriptions are only examples, and the specific descriptions can be referred to the embodiments shown below.

[0152] In the embodiments of the present application, when the terminal device determines that the first condition is met, such as when the terminal device expects to leave an RRC connected state, the terminal device does not detect a physical layer problem, does not detect a radio link failure, or does not initialize an RRC connection reestablishment, etc. Thus, not only does it effectively improve the problem of reestablishing an RRC connection with a network device when the terminal device expects to leave an RRC connected state, but it also effectively improves the situation of contradictory behavior of the terminal device. Moreover, since the terminal device determines that it expects to leave an RRC connected state, it does not perform the above events (such as detecting a physical layer problem or detecting a radio link failure or detecting a beam failure, etc.), thereby effectively improving the problem of the terminal device initiating unnecessary behavior, improving the problem of the terminal device wasting power consumption, and saving signaling overhead.

[0153] Figure 3b is a flowchart of another communication method provided by the embodiments of the present application, as shown in Figure 3b The method comprises:

[0154] 311. The terminal device determines whether a first condition is met.

[0155] 312. If it is determined that the first condition is met, the terminal device does not perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for the beam failure recovery.

[0156] 313. In a case where it is determined that the first condition is not met, any one or more of the following is performed: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing the RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, initiating a random access for the beam failure recovery.

[0157] It can be understood that the specific description about steps 311 to 313 can refer to the method shown in the foregoing or the specific embodiment shown in the following, which will not be described here in detail.

[0158] Figure 3c is a flowchart of another communication method provided by an embodiment of the present application, as shown in Figure 3c the method comprises the following steps.

[0159] 321. The terminal device determines that the first condition is not met; or, determines that the second condition is met.

[0160] 322. The terminal device performs any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing the RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, initiating a random access for the beam failure recovery.

[0161] 323. The terminal device determines that the first condition is met; or, determines that the second condition is not met.

[0162] 324. The terminal device does not perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing the RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, initiating a random access for the beam failure recovery.

[0163] For example, the time interval between the step 321 and the step 323 is not limited by the embodiment of the present application. For example, the terminal device can determine whether the first condition is met at a certain time interval, and if the first condition is not met, the step 322 is performed. For example, the terminal device can also determine whether the first condition is met at any time, which is not limited by the embodiment of the present application.

[0164] It can be understood that the specific description about steps 321 to 324 can refer to the method shown in the foregoing or the specific embodiment shown in the following, which will not be described here in detail.

[0165] The method provided by the present application will be described in detail from different embodiments.

[0166] An exemplary, Figure 5a is a user plane protocol stack diagram of a terminal device provided by an embodiment of the present application. As shown in the figure, Figure 5a The user plane protocol stack includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer.

[0167] An exemplary, Figure 5b is a control plane protocol stack diagram of a terminal device provided by an embodiment of the present application. As shown in the figure, Figure 5b The control plane protocol stack includes an RRC layer, a PDCP layer, an RLC layer, a MAC layer, and a PHY layer. It can be understood that the lower layer shown in the present application is a relative concept. For example, for the MAC layer, the lower layer can be the PHY layer.

[0168] Embodiment one,

[0169] In the case where the UE detects a physical layer problem according to the above condition A, the following implementation manner can be used:

[0170] Implementation manner one,

[0171] If the UE continuously receives N310 “out-of-sync” indications for a special cell (SpCell) from a lower layer, and none of the timers T300, T301, T304, T311, T316, T319, and the first timer is running, a timer T310 corresponding to the special cell is started.

[0172] Implementation manner two,

[0173] If the UE continuously receives N310 “out-of-sync” indications for a special cell (SpCell) from a lower layer, and none of the timers T300, T301, T304, T311, T316, T319 is running, and the UE does not expect or does not intend to leave the RRC connected state, or does not initialize the process of leaving the RRC connected state, or the UE does not send release indication information to the network device, a timer T310 corresponding to the special cell is started.

[0174] It can be understood that the above description about the first condition is applicable to the description of detecting physical layer problems in the embodiments of the present application, which will not be described again. For example, if the UE continuously receives N310 "out-of-sync" indications for a special cell from the lower layer, and the timers T300, T301, T304, T311, T316, and T319 are not running, and the UE does not request to leave the RRC connected state (or the UE does not request to switch from the RRC connected state to the RRC idle state or the RRC inactive state), the timer T310 corresponding to the special cell is started.

[0175] Implementation mode three,

[0176] If the UE continuously receives N310 "out-of-sync" indications for a source special cell (SpCell) from the lower layer, and the timer T304 and the first timer are not running, the timer T310 corresponding to the source special cell is started.

[0177] For example, in the process of switching cells, there are source cells and target cells.

[0178] Implementation mode four,

[0179] If the UE continuously receives N310 "out-of-sync" indications for a source special cell (SpCell) from the lower layer, and the timer T304 is not running, and the UE does not expect or plan to leave the RRC connected state, or the process of leaving the RRC connected state is not initialized, or the UE does not send release indication information to the network device, the timer T310 corresponding to the source special cell is started.

[0180] It can be understood that for the above-mentioned various implementation manners, if the UE expects or intends to leave the RRC connected state, or the UE initializes a procedure of leaving the RRC connected state, or the UE sends release indication information to the network device, or the first timer is in a running process, the UE does not start the timer T310 corresponding to the special cell (including the source special cell). Thus, the UE does not detect a physical layer problem, and does not detect a radio link failure, and does not initialize an RRC connection reestablishment, etc. Alternatively, the UE can first determine that it expects to leave the RRC connected state, and then the UE does not start the timer T310 corresponding to the cell. Alternatively, the UE can first monitor N310 "out-of-sync" indications for the special cell received from the lower layer, and the timer T304 is not in the running process; and then determine whether the UE expects to leave the RRC connected state. If the UE expects to leave the RRC connected state, the timer T310 corresponding to the cell is not started. If the UE does not expect to leave the RRC connected state, the timer T310 corresponding to the cell is started. It can be understood that the present application embodiment does not limit the order of the above-mentioned judgment conditions.

[0181] Implementation manner five,

[0182] For example, the timer T310 is timed out, and the first timer is not in the running process, and it is considered that a radio link failure is detected.

[0183] For example, the timer T310 is timed out, and the UE does not expect or intend to leave the RRC connected state, or the procedure of leaving the RRC connected state is not initialized, or the UE does not send release indication information to the network device, and it is considered that a radio link failure is detected.

[0184] It can be understood that for the above-mentioned implementation manners one to four, when the timer T310 is timed out, it can be considered that a radio link failure is detected. For the implementation manners one to five, the UE can further judge whether the condition is met: if the indication is from the RLC layer (such as the indication that the maximum retransmission number of the RLC layer is reached) (such as the indication transmitted from the RLC layer to the RRC layer), and the CA duplication is configured and activated, and the allowed serving cell parameter of the corresponding logical channel only includes the secondary cell (refer to the condition F shown above). If the above-mentioned condition (refer to the condition F shown above) is not met, it is considered that a radio link failure is detected. For example, after detecting the radio link failure, the UE can initialize the RRC connection reestablishment. For example, the UE initializes the RRC connection reestablishment process in the case that any one of the conditions G or H is not met, or the conditions G and H are not met. For the specific description of the conditions G or H, reference can be made to the above, and detailed description is not repeated here. It can be understood that the description of the conditions F, G and H is also applicable to the embodiments shown below, and thus detailed description is not repeated here.

[0185] Implementation manner six,

[0186] It can be understood that, for the above-mentioned implementation manners one to five, the problem that the UE is expected to leave the RRC connected state and re-establish the RRC connection with the network device is improved by modifying the judgment condition of detecting the physical layer problem.

[0187] In the embodiment of the present application, the judgment condition of radio link failure (such as the above-mentioned condition A) can not be modified, but the UE behavior is regulated. For example, when the UE is expected or intended to leave the RRC connected state, or when the UE initializes the process of leaving the RRC connected state, or when the UE sends the release indication information to the network device, or when the first timer is running, the UE does not monitor the "out-of-sync" indication sent from the lower layer. That is, the UE can not count the "out-of-sync" indication, so that the UE does not continuously receive N310 "out-of-sync" indications from the lower layer for a special cell, so that the UE does not start the timer T310 corresponding to the special cell. Correspondingly, when the UE is not expected or intended to leave the RRC connected state, or the process of leaving the RRC connected state is not initialized, or the UE does not send the release indication information to the network device, or the first timer is not running, the UE can monitor the "out-of-sync" indication sent from the lower layer. In this case, when the timer T310 times out, the UE can further detect the radio link failure according to the above-mentioned condition F, and further judge whether to initialize the RRC connection re-establishment according to the conditions G or H. The specific description of the conditions F, G and H can be referred to the above, and will not be repeated here.

[0188] The above-mentioned embodiment one is to explain the method provided by the embodiment of the present application according to the above-mentioned condition A, and the following embodiment two will explain the method provided by the embodiment of the present application by modifying the "judgment condition of detecting the radio link failure".

[0189] Embodiment two,

[0190] The UE considers that the radio link failure is detected by detecting the condition 1 and the condition 2.

[0191] Condition 1: UE does not expect or does not intend to leave RRC connected state, or the procedure of leaving RRC connected state is not initialized, or UE does not send release indication information to the network device, or the first timer is not running. Condition 2: a physical layer problem indication (such as timer T310 timeout), or UE does not switch in time after measurement reporting (such as timer T312 timeout), or a random access problem indication occurs and timers T300, T301, T304, T311 and T319 are not running, or an indication of reaching the maximum number of RLC layer retransmissions is received, or a consistent uplink LBT failure indication is received from the MAC layer and timer T304 is not running.

[0192] Optionally, condition 2 can further include: if the indication is from the RLC layer (such as the above-mentioned indication of reaching the maximum number of RLC layer retransmissions), and carrier aggregation (CA) duplication is configured and activated, and the allowed serving cell parameter (such as allowedServingCells) of the corresponding logical channel only includes secondary cells. If the above F condition is not met, it is considered that radio link failure is detected.

[0193] That is, the UE can determine whether radio link failure is detected through any one or more of the above conditions A to F, and the above condition 1. Optionally, after condition 1 is met, the UE performs the determination of condition 2, so that in the case that both condition 1 and condition 2 are met, it is considered that radio link failure is detected. Optionally, after condition 2 is met, the UE performs the determination of condition 1, so that in the case that both condition 1 and condition 2 are met, it is considered that radio link failure is detected. Optionally, the UE can not distinguish the order of the above conditions 1 and 2.

[0194] For example, after the UE detects radio link failure, it can further determine whether to initialize RRC connection reestablishment according to conditions G or H. For specific descriptions of conditions F, G and H, please refer to the above, which will not be repeated here.

[0195] Optionally, the UE expects or intends to leave the RRC connected state, or the UE initiates a procedure of leaving the RRC connected state, or the UE sends release indication information to the network device, or the first timer is running, and the above condition 2 is met, the UE can leave the RRC connected state. Optionally, the UE performs a procedure of returning to the RRC idle state. Optionally, the UE performs a procedure of returning to the RRC inactive state. Optionally, the UE sets the RRC release reason as “RRC connection failure”. That is, the UE does not need to continue to perform the wireless link failure detection step, such as not continuing to perform the above condition G and / or the above condition H, and the UE does not need to initiate the RRC connection reestablishment.

[0196] After the UE detects the wireless link failure, the UE can need to initiate a connection reestablishment procedure, and therefore, the following embodiment three will take the modification of “initiating the RRC connection reestablishment procedure” as an example to illustrate the method provided by the embodiments of the present application.

[0197] Embodiment three,

[0198] The UE initiates the RRC connection reestablishment according to the condition 1, the condition 2, and the condition 3.

[0199] The condition 1 is that the UE does not expect or intend to leave the RRC connected state, or the UE does not initiate a procedure of leaving the RRC connected state, or the UE does not send release indication information to the network device, or the first timer is not running. The condition 2 is that the UE detects the wireless link failure. The condition 3 is that the AS security is not activated, or the AS security is activated but the SRB2 and at least one DRB are not established, or the SRB2 is not established in the IAB scenario (refer to the above G and H).

[0200] Optionally, the condition 2 can include the following conditions in addition to the condition that the UE detects the wireless link failure: when the synchronization reconfiguration fails, or when the NR mobility fails, or when the integrity protection check failure is received from the lower layer, or when the RRC connection reconfiguration fails. If any one of the conditions in the condition 2 is met, it is considered that the condition 2 is met. Optionally, in the case that the UE meets the above conditions 1 and 2 and does not meet the condition 3, the RRC connection reestablishment procedure is initiated. Optionally, the UE does not meet the above condition 1, the UE meets the above condition 2, and does not meet the condition 3, the UE does not initiate the RRC connection reestablishment. That is, the UE expects or intends to leave the RRC connected state, or the UE initiates a procedure of leaving the RRC connected state, or the UE sends release indication information to the network device, or the first timer is running, even if the UE meets the above condition 2 and does not meet the above condition 3, the UE does not initiate the RRC connection reestablishment procedure. The order of the above conditions is not limited in the embodiments of the present application.

[0201] It can be understood that the specific description about the conditions 1 to 3 can refer to the above, and will not be described in detail here.

[0202] In the case that the UE needs to initialize the RRC connection reestablishment procedure, the UE can also perform the cell reselection procedure, and therefore, the following embodiment four will take the modified "cell reselection procedure" as an example to illustrate the method provided by the embodiments of the present application.

[0203] Embodiment four,

[0204] For example, after initializing the RRC connection reestablishment procedure, the UE can perform one or more of the following behaviors: stopping the timer T310 if T310 is running, stopping the timer T304 if T304 is running, starting the timer T311, suspending all radio bearers except SRB3, resetting the MAC, releasing the secondary cell of the MCG if the secondary cell of the MCG is configured, and releasing the special cell configuration if the special cell is configured. It can be understood that the embodiments of the present application do not limit the sequence of the above behaviors and the cell reselection.

[0205] In the embodiments of the present application, whether the UE performs the cell reselection procedure needs to be combined with the above condition 1.

[0206] For example, if the UE does not expect or does not intend to leave the RRC connected state, or the UE does not initialize the process of leaving the RRC connected state, or the UE does not send the release indication information to the network device, or the first timer is not in operation, the UE can continue to perform the cell reselection procedure. Optionally, the UE can also send the RRC reestablishment request message to the network device on the cell reselected.

[0207] For example, when the UE expects or intends to leave the RRC connected state, or when the UE initiates the procedure of leaving the RRC connected state, or when the UE sends the release indication information to the network device, or when the first timer is running, the UE does not continue to perform the cell reselection procedure, and the UE does not send the RRC reestablishment request message to the network device in the cell to which the UE reselects. For example, after the UE initiates the RRC connection reestablishment, the UE can determine whether the UE expects to leave the RRC connected state. If the UE does not expect to leave the RRC connected state, the UE performs the cell reselection procedure. If the UE expects to leave the RRC connected state, the UE does not perform the cell reselection procedure. For example, the UE does not perform the cell reselection procedure, but the UE can perform the procedure of returning to the RRC idle state, or the UE performs the procedure of returning to the RRC inactive state, or the UE sets the release reason as "RRC connection failure". Optionally, the UE can perform other behaviors after the above-mentioned procedure of initiating the RRC connection reestablishment. For example, the other behaviors can be stopping the timer T310 if the T310 is running, or stopping the timer T304 if the T304 is running, and the like. For details of the other behaviors, refer to the above description, which will not be repeated here.

[0208] After the UE detects the radio link failure and initiates the RRC connection reestablishment procedure and the cell reselection procedure, the UE also needs to send the RRC reestablishment request message to the network device in the cell to which the UE reselects. Therefore, the following embodiment five will take the modification of "sending the RRC reestablishment request message" as an example to illustrate the method provided by the embodiments of the present application.

[0209] Embodiment five,

[0210] For example, after the UE expects or intends to leave the RRC connected state, or after the UE initiates the procedure of leaving the RRC connected state, or after the UE sends the release indication information to the network device, or when the first timer is running, the UE does not send the RRC reestablishment request message to the network device. Optionally, the UE can determine whether to send the RRC reestablishment request message to the network device according to whether the cell to which the UE reselects is the cell to which the UE is originally connected (for example, the cell in which the radio link failure occurs). If the cell to which the UE reselects is the cell to which the UE is originally connected, the UE sends the RRC reestablishment request message to the network device. If the cell to which the UE reselects is not the cell to which the UE is originally connected, the UE does not send the RRC reestablishment request message to the network device. Optionally, in the case that the UE does not send the RRC reestablishment request message, the UE can perform the procedure of returning to the RRC idle state, or the UE performs the procedure of returning to the RRC inactive state, or the UE sets the release reason as "RRC connection failure".

[0211] For example, the UE does not expect or does not intend to leave the RRC connected state, or the UE does not initialize the procedure of leaving the RRC connected state, or the UE does not send the release indication information to the network device, or the first timer is not running, the UE sends an RRC reestablishment request (RRCReestablishmentRequest) message to the network device on the cell reselected by the UE.

[0212] By the embodiments of the present application, for example, the above-mentioned embodiments one to five, unnecessary behaviors initiated by the UE can be effectively avoided, such as detecting a radio link failure, or initiating a connection reestablishment procedure, or performing a cell reselection procedure, or sending an RRC reestablishment request message, in the case that the UE expects to leave the RRC connected state, signaling overhead is effectively saved, and resource waste is avoided.

[0213] It can be understood that each of the above-mentioned embodiments can be a separate embodiment, or can be combined with each other, and the embodiments of the present application do not limit this.

[0214] It should be noted that the above-mentioned embodiments one to five can also be applied to a DC scenario, for example, the above-mentioned radio link failure can be a radio link failure occurring in the MN or MCG in DC, and for example, the above-mentioned radio link failure can be a radio link failure occurring in the SN or SCG in DC.

[0215] Optionally, when the UE expects or intends to leave the RRC connected state, or it can be considered that when the UE initializes the procedure of leaving the RRC connected state, or it can be considered that when the UE sends the release indication information to the network device, or it can be considered that when the first timer is in the running process, the UE does not initialize the failure information procedure to report the RLC failure.

[0216] Optionally, when the UE does not expect or does not intend to leave the RRC connected state, or it can be considered that when the UE does not initialize the procedure of leaving the RRC connected state, or it can be considered that when the UE does not send the release indication information to the network device, or it can be considered that when the first timer is not in the running process, the UE can further initialize the failure information procedure to report the RLC failure, at this time, the UE needs to further judge the related conditions to confirm whether to initialize the failure information procedure to report the RLC failure.

[0217] The above-mentioned embodiments of the present application can be applied to a DC scenario, thereby avoiding unnecessary behaviors initiated by the UE, such as detecting a radio link failure, or initiating a connection reestablishment procedure, or sending an RRC reestablishment request message, or initializing a failure information procedure to report an RLC failure, signaling overhead is effectively saved.

[0218] Embodiment six,

[0219] It can be understood that the method provided in the present application can be applied not only to radio link failure, but also to beam failure. For example, the UE monitors the control channel quality, and if the control channel quality is continuously lower than a certain threshold and lasts for a certain time, it is considered that beam failure is detected, and the beam failure recovery process is entered. Thus, the UE indicates to the network device that beam failure occurs and informs the network device of the backup beam number through the random access process for beam failure recovery. If the UE successfully receives the response of the network device on the backup beam, it is considered that the beam failure recovery process is successfully completed, otherwise the link recovery process is entered.

[0220] Optionally, when the UE expects or intends to leave the RRC connected state, or when the UE initializes the process of leaving the RRC connected state, or when the UE sends release indication information to the network device, or when the first timer is in operation, the UE does not detect beam failure, or the UE is not allowed to initiate the beam failure recovery process, or the UE is not allowed to initiate the random access process for beam failure recovery.

[0221] Optionally, when the UE does not expect or intend to leave the RRC connected state, or it can be considered that the UE does not initialize the process of leaving the RRC connected state, or it can be considered that the UE does not send release indication information to the network device, or it can be considered that the first timer is not in operation, the UE can further detect beam failure, or the UE can further initiate the beam failure recovery process, or the UE can further initiate the random access process for beam failure recovery. At this time, the UE needs to further judge the related conditions to confirm whether it needs to detect beam failure, or whether it needs to initiate the beam failure recovery process, or whether it needs to initiate the random access process for beam failure recovery. For example, when the UE determines that it does not expect to leave the RRC connected state, and in the case that the control channel quality monitored by the UE is lower than a certain threshold and lasts for a certain time, the UE considers that beam failure is detected. For example, when the UE determines that it expects to leave the RRC connected state, the UE does not monitor the control channel quality. For example, after the UE detects beam failure, the UE determines that it does not expect to leave the RRC connected state, and the UE can indicate to the network device that beam failure occurs and inform the network device of the backup beam number through the random access process for beam failure recovery. For example, after the UE detects beam failure, the UE determines that it expects to leave the RRC connected state, and the UE does not send information indicating beam failure to the network device, and does not inform the network device of the backup beam number, etc.

[0222] That is, in the process of UE detecting beam failure, performing beam failure recovery, initiating random access for beam failure recovery, etc., unnecessary behaviors of UE can be avoided by adding judgment conditions, such as avoiding UE from detecting beam failure, or initiating a beam failure recovery process, or initiating a random access process for beam failure recovery.

[0223] The first timer provided by the embodiments of the present application will be described in detail below. It can be understood that the first timer shown in the embodiments of the present application can be coupled with at least one of the above-mentioned embodiments 1 to 6, or can be independent of the above-mentioned embodiments 1 to 6, and the embodiments of the present application do not limit this.

[0224] When the UE expects or intends to leave the RRC connected state, or when the UE initializes the process of leaving the RRC connected state, or when the UE sends release indication information to the network device, the UE needs to start the first timer, such as the first timer needs to be in a running process. Optionally, when the first timer is running, the UE waits for the RRC release message sent by the network device. Optionally, when the first timer times out, the UE does not receive the RRC release message sent by the network device, and then the UE automatically converts to the RRC idle state or the RRC inactive state.

[0225] In the embodiments of the present application, the starting or restarting of the first timer can meet one or more of the following conditions:

[0226] Optionally, when the UE initializes or triggers the process of leaving the RRC connected state, the UE starts or restarts the first timer.

[0227] Optionally, when the UE sends release indication information to the network device, the UE starts or restarts the first timer.

[0228] Optionally, when the UE successfully sends release indication information to the network device, the UE starts or restarts the first timer. The UE needs to judge that the network device has successfully received the release indication information, for example, the UE receives feedback information such as an acknowledgement (ACK) of the physical layer or a response message of the RLC layer sent by the network device to successfully receive the release indication information. The embodiments of the present application do not limit the way in which the UE judges that the network device has successfully received the release indication information.

[0229] In the embodiments of the present application, the stopping of the first timer can meet one or more of the following conditions:

[0230] Optionally, when the UE receives the RRC release message sent by the network device, the UE stops the first timer. Optionally, when the first timer expires, the first timer is stopped. The duration of the first timer can refer to the description of the first duration, which will not be repeated here.

[0231] It can be understood that when the first timer in the embodiment of the present application is decoupled from the above-mentioned embodiments 1 to 6, the stopping of the first timer provided by the embodiment of the present application can also include one or more of the following conditions:

[0232] Optionally, when the UE detects radio link failure, the UE stops the first timer. Optionally, when the UE initializes the RRC connection reestablishment process, the UE stops the first timer. Optionally, when the UE performs the cell reselection process, the UE stops the first timer. Optionally, when the UE sends the RRC reestablishment request message to the network device, the UE stops the first timer. That is, during the period when the UE expects to leave the RRC connected state while maintaining the RRC connected state with the network device and waiting for a certain duration, if the UE detects radio link failure, the first timer can be stopped. Because the UE detects radio link failure, it means that the UE needs to initialize the RRC connection reestablishment, or cell reselection, or send the RRC reestablishment request message. Therefore, the UE can stop the first timer. Optionally, the UE can also not transition from the RRC connected state to the RRC idle state or the RRC inactive state. For example, during the above period, if the UE initializes the RRC connection reestablishment, the first timer can also be stopped.

[0233] In the case where the release indication information is carried in the NAS message, and the first timer is a timer maintained by the NAS layer, the UE internal signaling interaction and the signaling interaction between the core network device and the access network device can be as follows:

[0234] Optionally, the NAS layer of the UE generates (may also be referred to as generates) the NAS message carrying the release indication information and submits it to the RRC layer of the UE. The NAS layer of the UE indicates the RRC layer of the UE as follows:

[0235] The above-mentioned NAS message is a message carrying release indication information, the NAS layer starts or restarts the first timer, the duration of the first timer (which can also be understood as the first duration), the release indication information has been sent to the network device, and the release indication information has been successfully sent to the network device.

[0236] The NAS layer of the UE can determine the starting or restarting of the first timer by indicating one or more of the above information to the RRC layer. For example, the NAS layer of the UE can determine the starting or restarting of the first timer according to various cases of the above "starting or restarting of the first timer". Optionally, the RRC layer or the MAC layer or the PHY layer can tell the NAS layer to start or restart the first timer and / or the running duration of the first timer, or the RRC layer or the MAC layer or the PHY layer can tell the NAS layer that the release indication information has been sent to the access network device, or the RRC layer can tell the NAS layer that the release indication information has been successfully sent to the access network device, so that the NAS layer determines to start or restart the first timer.

[0237] Optionally, when the core network device receives the NAS message carrying the release indication information sent by the UE, the core network device can also indicate to the access network device that the UE has sent the release indication information. Optionally, the UE can send the NAS message carrying the release indication information to the access network device, and the access network device can transparently transmit the NAS message to the core network device. Optionally, the core network device can also indicate to the access network device to start or restart the first timer and / or the running duration of the first timer, and the access network device can start or restart the first timer according to the message sent by the core network device.

[0238] In the case that the release indication information is carried in the NAS layer message and the first timer is a timer maintained by the RRC layer, the internal signaling interaction of the UE and the interworking signaling interaction between the core network device and the access network device can be as follows:

[0239] Optionally, the NAS layer of the UE generates (or can also be referred to as generates) the NAS message carrying the release indication information and submits the NAS message to the RRC layer of the UE. The NAS layer of the UE indicates any one or more of the following to the RRC layer:

[0240] The above NAS message is a message carrying the release indication information, the starting or restarting of the first timer, and the running duration of the first timer. After the RRC layer of the UE knows the information, the RRC layer of the UE can determine the starting or restarting of the first timer according to various cases of the above "starting or restarting of the timer".

[0241] Optionally, when the core network device receives the NAS message carrying the release indication information sent by the UE, the core network device can also indicate to the access network device that the UE has sent the release indication information. Optionally, the core network device can also indicate to the access network device to start or restart the timer and / or the running duration of the timer, and the access network device can start or restart the timer according to the message sent by the core network device.

[0242] The following will introduce in detail some other terms related to the present application.

[0243] The UE needs to perform radio resource measurement (RRM) measurement on the serving cell or neighbor cell in the serving cell in order for the UE to obtain current channel quality, determine whether to continue to stay in the current cell for communication, or reselect or handover to other cell with better channel quality for communication. For example, the behavior of measurement can be different according to the moving state of the UE and / or the location of the UE in the cell.

[0244] a. Measurement relaxation for cell-center and / or low-speed UE

[0245] For example, for cell-center and / or low-speed UE, the measurement on the neighbor cell can be relaxed in order to save power consumption. The criterion of measurement relaxation can be configured by the network device (such as the access network device as introduced above), which can include, for example:

[0246] 1. The low-speed criterion can be that the difference of the change of the reference signal receiving power (RSRP) and / or the reference signal receiving quality (RSRQ) measured by the UE in a period of time is less than or equal to a threshold value one. It can be understood that whether the threshold value one corresponding to the RSRP is the same as the threshold value one corresponding to the RSRQ is not limited in the present application. For example, the threshold value one corresponding to the RSRP and the threshold value one corresponding to the RSRQ can be different threshold values.

[0247] 2. The cell-edge criterion (which can also be referred to as the second criterion) can be that the value of the RSRP and / or the RSRQ measured by the UE is greater than a threshold value two. It can be understood that whether the threshold value two corresponding to the RSRP is the same as the threshold value two corresponding to the RSRQ is not limited in the present application. For example, the threshold value two corresponding to the RSRP and the threshold value two corresponding to the RSRQ can be different threshold values.

[0248] Exemplarily, the threshold value one and / or the threshold value two can be configured by the network device. Exemplarily, if the network device only configures the low-speed moving criterion and does not configure the cell edge criterion, the UE can judge whether the low-speed moving criterion is met, and if met, the UE can perform the measurement relaxation. Exemplarily, if the network device only configures the cell edge criterion and does not configure the low-speed moving criterion, the UE can judge whether the cell edge criterion is met, and if met, the UE can perform the measurement relaxation. Exemplarily, if the network device configures both the low-speed moving criterion and the cell edge criterion, the UE can perform the RRM relaxation as long as any one of the low-speed moving criterion or the cell edge criterion is met, or the UE can perform the RRM relaxation only if both the low-speed moving criterion and the cell edge criterion are met. Optionally, the network device can further configure whether the measurement relaxation is allowed for the high-priority frequency point.

[0249] Optionally, the measurement of the neighbor cell includes one or more of the following: the intra-frequency neighbor cell measurement, the inter-frequency neighbor cell measurement, and the inter-system neighbor cell measurement. Optionally, the measurement relaxation manner can include, but is not limited to, one or more of the following: extending the measurement period, reducing the number of measurement frequency points or cells, and reducing the reference signal for measurement. Exemplarily, the extending the measurement period can include one or more of the following: extending the measurement period to 3 times of the original measurement period, extending the measurement period to 1 hour, and not performing the measurement on the neighbor cell. The measurement relaxation manner after the UE only meets the low-speed moving criterion, the measurement relaxation manner after the UE only meets the cell edge criterion, and the measurement relaxation manner after the UE meets both the low-speed moving criterion and the cell edge criterion can be the same or different.

[0250] b. Measurement relaxation for stationary UE

[0251] The measurement relaxation can also be performed for the stationary UE. For example, the stationary UE can be relaxed to a greater extent than the low-speed moving UE, so as to further save the power consumption.

[0252] Exemplarily, the stationary UE can include the UE that does not move, such as the completely stationary UE, and the UE that can move and is currently in the stationary state. The criterion for the measurement relaxation is configured by the network device.

[0253] For example, the static criterion (may also be referred to as a first criterion) can be that a difference between a change of RSRP and / or RSRQ measured by the UE in a period of time is less than or equal to a threshold value three. The threshold value three can be configured by the network device, and the RSRP and / or RSRQ can be a measurement result value at a cell level or a measurement result value at a beam level. It can be understood that whether the threshold value three corresponding to the RSRP is the same as the threshold value three corresponding to the RSRQ is not limited in the present application. For example, the threshold value three corresponding to the RSRP and the threshold value three corresponding to the RSRQ can be different threshold values. For example, the RSRP and the RSRQ can both be measurement result values at a cell level or both be measurement result values at a beam level. Or, the RSRP and the RSRQ can be measurement result values at different levels, and the like, which are not limited in the present application.

[0254] For example, when the UE satisfies the static criterion, the UE can perform measurement relaxation. The measurement relaxation manner of the UE satisfying the static criterion can be different from the measurement relaxation manner of the UE satisfying only the low-speed movement criterion, the measurement relaxation manner of the UE satisfying only the cell edge criterion, and the measurement relaxation manner of the UE satisfying the low-speed movement criterion and the cell edge criterion at the same time.

[0255] The static criterion can be used as a criterion for judgment alone to determine whether measurement relaxation can be performed. Alternatively, the static criterion can also be combined with the location of the UE in the cell, such as considering the movement state of the UE and the location of the UE in the cell at the same time. Therefore, the static criterion can also be combined with the cell edge criterion. For example, as shown in Table 1, when the UE satisfies only the static criterion, the UE can perform measurement relaxation according to measurement relaxation manner 1; and when the UE satisfies the static criterion and the cell edge criterion at the same time, the UE can perform measurement relaxation according to measurement relaxation manner 2. The measurement relaxation manner 1 is different from the measurement relaxation manner 2, for example, the measurement relaxation manner 2 is more relaxed than the measurement relaxation manner 1.

[0256] Table 1

[0257] Measurement relaxation criteria met by the terminal device Measurement relaxation mode after meeting the measurement relaxation criteria Stationary criterion Measurement relaxation mode 1 Stationary criterion and cell edge criterion Measurement relaxation mode 2

[0258] The cell edge criterion can be the cell edge criterion described above for the UE at the cell center and / or the low-speed movement, or a new cell edge criterion can be introduced. However, when the above-mentioned cell edge criterion is reused, the UE is not clear whether the static criterion needs to be combined with the above-mentioned cell edge criterion to determine whether measurement relaxation can be performed.

[0259] In one case, the network device configures the cell edge criterion only as the measurement relaxation criterion for the UEs in the cell center and / or the low speed UEs, and does not want to combine the stationary criterion. In another case, the network device configures the cell edge criterion as the measurement relaxation criterion for the UEs in the cell center and / or the low speed UEs, and wants to combine the stationary criterion. If the network device configures the cell edge criterion, due to the understanding of the above two cases, the UE and the network device can have different understanding, for example, the UE uses the criterion different from the criterion the network device wants to configure, thereby affecting the performance of the system.

[0260] In view of this, the embodiment of the present application provides a method and device for indicating measurement relaxation. The situation that the criterion used by the UE is different from the criterion configured by the network device can be effectively improved, and the system performance is effectively improved.

[0261] In the embodiment of the present application, the terminal device can receive the first indication information sent by the network device, and the first indication information is used to indicate whether the first criterion needs to be combined with the second criterion, so that the terminal device clearly knows whether only the first criterion needs to be judged or the first criterion and the second criterion need to be combined to judge, thereby avoiding the problem that the terminal device and the network device have different understanding and cause the system performance to decrease. It can be understood that the specific description of the terminal device or the network device (such as the access network device shown above) involved in the embodiment of the present application can be referred to the above, and will not be described in detail here.

[0262] The method for indicating measurement relaxation provided by the present application is described in detail below.

[0263] Figure 6 is a flowchart of the method for indicating measurement relaxation provided by the embodiment of the present application, as shown in Figure 6 , the method for indicating measurement relaxation comprises:

[0264] 601. The network device sends the first indication information to the terminal device. Correspondingly, the terminal device receives the first indication information sent by the network device, and the first indication information is used to indicate whether the first criterion needs to be combined with the second criterion, the first criterion is used for the terminal device to detect whether it is stationary, and the second criterion is used for the terminal device to detect whether it is not at the cell edge.

[0265] For example, the first criterion is used to detect whether the terminal device is stationary, and the second criterion is used to detect whether the terminal device is not at the cell edge. Alternatively, the first criterion is used for the terminal device to detect that it is stationary, and the second criterion is used for the terminal device to detect that it is not at the cell edge. Alternatively, the first criterion is used to detect that the terminal device is stationary, and the second criterion is used to detect that the terminal device is not at the cell edge. Alternatively, the first criterion is used to detect that the terminal device is stationary, and the second criterion is used to detect that the terminal device is at the cell edge.

[0266] Optionally, the first criterion can be the stationary criterion, and the second criterion can be the cell edge criterion. For details of the stationary criterion and the cell edge criterion, refer to the foregoing description, which will not be repeated here.

[0267] Optionally, the first criterion can be a stationary criterion of a first protocol version, and the second criterion can be a cell edge criterion of a second protocol version. For example, the first protocol version is release-17, and the second protocol version is release-16.

[0268] Optionally, whether the first criterion needs to be combined with the second criterion can be indicated by whether the first indication information exists. For example, if the first indication information exists, it indicates that the first criterion needs to be combined with the second criterion; if the first indication information does not exist, it indicates that the first criterion does not need to be combined with the second criterion. Alternatively, if the first indication information takes a first value (for example, takes a value of 0 or TRUE), it indicates that the first criterion needs to be combined with the second criterion; if the first indication information takes a second value (for example, takes a value of 1 or FALSE), it indicates that the first criterion does not need to be combined with the second criterion.

[0269] Optionally, the terminal device receives information for indicating the first criterion and / or information for indicating the second criterion sent by the network device. For example, the information for indicating the first criterion and the information for indicating the second criterion can be carried in the same message, or can also be carried in different messages. For ease of description, the first criterion will be taken as an example to describe the first criterion and the first indication information below. For example, the first indication information can be carried in the same message as the information for indicating the first criterion. Alternatively, the first indication information can also be carried in a different message from the information for indicating the first criterion. If the first indication information and the information for indicating the first criterion are carried in different messages, the order of sending the first indication information and the information for indicating the first criterion is not limited. For example, the first indication information and the information for indicating the first criterion can be carried in system information (SI), for example, in system information block (SIB) 2.

[0270] 602. The terminal device determines whether the first criterion is met or whether the first criterion and the second criterion are met according to the first indication information.

[0271] For example, if the first indication information indicates that the first criterion does not need to be combined with the second criterion, the terminal device determines that it only needs to determine whether the first criterion is met. If the first indication information indicates that the first criterion needs to be combined with the second criterion, the terminal device determines that it needs to determine whether the first criterion and the second criterion are met.

[0272] Optionally, the first indication information indicates that the first criterion does not need to be combined with the second criterion, and the terminal device determines that it only needs to determine whether the first criterion is met. If the terminal device determines that the first criterion is met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation manner, as shown in Table 1. If the terminal device determines that the first criterion is not met, the terminal device cannot perform measurement relaxation.

[0273] Optionally, the first indication information indicates that the first criterion needs to be combined with the second criterion, and the terminal device determines that it needs to determine whether the first criterion and the second criterion are met. The terminal device performs measurement relaxation according to whether the first criterion and the second criterion are met, which can have the following implementation manners:

[0274] Implementation manner one,

[0275] If the terminal device determines that the first criterion and the second criterion are met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation manner, as shown in Table 2. If the terminal device determines that the first criterion and the second criterion are not met, the terminal device cannot perform measurement relaxation.

[0276] Table 2

[0277]

[0278] It can be understood that in the implementation manner one, only the two cases of “the first criterion and the second criterion are met” and “the first criterion and the second criterion are not met” exist, and only the two cases of “measurement relaxation is performed according to the measurement relaxation manner 2” and “measurement relaxation is not performed” exist.

[0279] Implementation manner two,

[0280] If the terminal device determines that the first criterion and the second criterion are met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation manner, as shown in Table 3. If the terminal device determines that the first criterion and the second criterion are not met, but only the first criterion is met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation manner, as shown in Table 3. If the terminal device determines that the first criterion and the second criterion are not met, and the first criterion is also not met, the terminal device can not perform measurement relaxation.

[0281] Table 3

[0282]

[0283] It can be understood that in the second implementation mode, there are three cases of satisfying the first criterion and the second criterion, not satisfying the first criterion and the second criterion but only satisfying the first criterion, and not satisfying the first criterion and the second criterion, and there are three cases of performing measurement relaxation according to measurement relaxation mode 2, performing measurement relaxation according to measurement relaxation mode 1, and not performing measurement relaxation.

[0284] It can be understood that the measurement relaxation mode 2 shown above can also be referred to as a second measurement relaxation mode, and the measurement relaxation mode 1 can also be referred to as a first measurement relaxation mode. The embodiments of the present application do not limit the specific names of the above measurement relaxation modes.

[0285] The third implementation mode is as follows:

[0286] The network device can further configure whether to allow the terminal device to perform measurement relaxation when only the first criterion is satisfied.

[0287] Optionally, the terminal device receives second indication information sent by the network device, and the second indication information is used to indicate whether the terminal device is allowed to perform measurement relaxation when only the first criterion is satisfied.

[0288] For example, if the second indication information exists, it indicates that the terminal device is allowed to perform measurement relaxation when only the first criterion is satisfied. For another example, if the second indication information does not exist, it indicates that the terminal device is not allowed to perform measurement relaxation when only the first criterion is satisfied. Alternatively, if the second indication information takes a first value (for example, takes a value of 0 or TRUE), it indicates that the terminal device is allowed to perform measurement relaxation when only the first criterion is satisfied. If the second indication information takes a second value (for example, takes a value of 1 or FALSE), it indicates that the terminal device is not allowed to perform measurement relaxation when only the first criterion is satisfied.

[0289] Optionally, if the second indication information indicates that the terminal device is not allowed to perform measurement relaxation when only the first criterion is satisfied, the terminal device determines that it is not necessary to judge whether only the first criterion is satisfied, and at this time, there are only two cases of satisfying the first criterion and the second criterion and not satisfying the first criterion and the second criterion. Similar to the first implementation mode, if the terminal device judges that the first criterion and the second criterion are satisfied, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation mode. As shown in Table 2, the terminal device performs measurement relaxation according to measurement relaxation mode 2. If the terminal device judges that the first criterion and the second criterion are not satisfied, the terminal device cannot perform measurement relaxation.

[0290] Optionally, if the second indication information indicates that the terminal device is allowed to perform measurement relaxation when only the first criterion is met, the terminal device determines whether only the first criterion is met, at this time there are three cases: the first criterion and the second criterion are met, the first criterion and the second criterion are not met but only the first criterion is met, and the first criterion and the second criterion are not met and the first criterion is not met. Similar to implementation mode two: if the terminal device determines that the first criterion and the second criterion are met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation mode, as shown in Table 3, the terminal device performs measurement relaxation according to measurement relaxation mode 2. If the terminal device determines that the first criterion and the second criterion are not met, but only the first criterion is met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation mode, as shown in Table 3, the terminal device performs measurement relaxation according to measurement relaxation mode 1. If the terminal device determines that the first criterion and the second criterion are not met, and the first criterion is not met, the terminal device cannot perform measurement relaxation.

[0291] Through the embodiments of the present application, the problem that the terminal device and the network device are inconsistent in understanding and the system performance is reduced can be effectively avoided, for example, through the first indication information, the terminal device knows whether it needs to judge only the first criterion or needs to judge the first criterion and the second criterion together.

[0292] Optionally, if the network device only configures the terminal device with the first criterion, the terminal device only needs to determine whether the first criterion is met, at this time the network device does not need to send the terminal device the first indication information. If the terminal device determines that the first criterion is met, the terminal device can perform measurement relaxation according to the corresponding measurement relaxation mode, and the terminal device performs measurement relaxation according to measurement relaxation mode 1. If the terminal device determines that the first criterion is not met, the terminal device cannot perform measurement relaxation.

[0293] Optionally, the cell edge criterion can reuse the cell edge criterion in release-16 or use a new release-17 cell edge criterion. Optionally, a third criterion can also be included, and the third criterion can be the above-mentioned cell edge criterion. The third criterion is a cell edge criterion of a first protocol version.

[0294] Optionally, the terminal device receives information sent by the network device for indicating the third criterion. Specifically, the third criterion can be carried in the same message as the first criterion and the second criterion, or can be carried in different messages. If the third criterion is carried in different messages from the first criterion and the second criterion, the order of sending the third criterion, the first criterion and the second criterion is not limited. For example, the third criterion, the first criterion and the second criterion can be carried in system information (SI), such as system information block (SIB) 2.

[0295] Optionally, if the network device configures the terminal device with the first criterion, the second criterion and the third criterion, the terminal device only needs to determine whether the first criterion and / or the third criterion are met, and the second criterion is ignored, and the network device does not need to send the first indication information to the terminal device.

[0296] The present application also provides the following embodiments. It should be noted that the numbering of the following embodiments does not necessarily follow the numbering order of the previous embodiments:

[0297] 1. An embodiment of indicating measurement relaxation, applied to a terminal device, the embodiment comprising:

[0298] receiving first indication information sent by a network device, the first indication information being used to indicate whether a first criterion is combined with a second criterion, the first criterion being a criterion used to detect whether the terminal device is static, and the second criterion being a criterion used to detect whether the terminal device is not at the edge of a cell;

[0299] determining whether the first criterion is met or whether the first criterion and the second criterion are met according to the first indication information.

[0300] 2. The embodiment of embodiment 1, further comprising:

[0301] receiving information sent by the network device to indicate the first criterion and / or information to indicate the second criterion.

[0302] 3. The embodiment of embodiment 1 or 2, further comprising:

[0303] if the first indication information indicates that the first criterion is not combined with the second criterion, determining whether the first criterion is met;

[0304] if the terminal device meets the first criterion, performing measurement relaxation in a first measurement relaxation manner; or if the terminal device does not meet the first criterion, not performing measurement relaxation.

[0305] 4. The embodiment of embodiment 1 or 2, further comprising:

[0306] if the first indication information indicates that the first criterion is combined with the second criterion, determining whether the first criterion is met or whether the first criterion and the second criterion are met;

[0307] if the terminal device meets the first criterion and the second criterion, performing measurement relaxation in a second measurement relaxation manner; or,

[0308] If the terminal device does not satisfy the first criterion and the second criterion, no measurement relaxation is performed.

[0309] 5. The embodiment of any of the preceding embodiments 1-2, further comprising:

[0310] If the first indication information indicates that the first criterion is combined with the second criterion, it is determined whether the first criterion is satisfied or whether the first criterion and the second criterion are satisfied.

[0311] If the terminal device determines that the first criterion and the second criterion are satisfied, measurement relaxation is performed according to a second measurement relaxation manner.

[0312] If the terminal device determines that the first criterion and the second criterion are not satisfied and the first criterion is satisfied, measurement relaxation is performed according to a first measurement relaxation manner.

[0313] If the terminal device determines that the first criterion and the second criterion are not satisfied and the first criterion is not satisfied, no measurement relaxation is performed.

[0314] 6. The embodiment of any of the preceding embodiments 4-5, further comprising:

[0315] receiving second indication information transmitted by the network device, the second indication information being used to indicate whether the terminal device is allowed to perform measurement relaxation when the terminal device only satisfies the first criterion.

[0316] 7. The embodiment of any of the preceding embodiments 6, wherein the second indication information indicates that the terminal device is not allowed to perform measurement relaxation when the terminal device only satisfies the first criterion.

[0317] 8. The embodiment of any of the preceding embodiments 6, wherein the second indication information indicates that the terminal device is allowed to perform measurement relaxation when the terminal device only satisfies the first criterion.

[0318] 9. The embodiment of any of the preceding embodiments 1-8, wherein the first criterion corresponds to a first protocol version and the second criterion corresponds to a second protocol version.

[0319] Hereinafter, a communication apparatus provided by embodiments of the present application will be described.

[0320] The communication apparatus is divided into functional modules according to the above method embodiments, for example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be realized in the form of hardware or in the form of a software functional module. It should be noted that the division of the modules in the present application is illustrative, and is only a logical functional division. When actually implemented, another division mode can be used. The following will be described in detail Figures 7 to 9 The communication apparatus of the embodiments of the present application is described in detail.

[0321] Figure 7 is a structural schematic diagram of a communication apparatus provided by the embodiments of the present application, as Figure 7 shown, the communication apparatus includes a processing unit 701 and a transceiver unit 702.

[0322] In some embodiments of the present application, the communication apparatus can be the terminal device or a chip in the terminal device shown above, etc. For example, the communication apparatus can be used to execute the method shown in the above method embodiments, such as Figures 3a to 3c For example, the communication apparatus can be used to execute any one or more methods shown in the above method embodiments 1 to 6, etc.

[0323] The processing unit 701 is configured to determine that a first condition is not met or a second condition is met, the first condition being used to indicate that the terminal device expects to leave a radio resource control (RRC) connected state, and the second condition being used to indicate that the terminal device does not expect to leave the RRC connected state.

[0324] The processing unit 701 is further configured to perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for the beam failure recovery.

[0325] Optionally, the processing unit 701 can perform the cell reselection or send the RRC reestablishment request message through the transceiver unit 702, and the specific mode of the transceiver unit 702 and the processing unit 701 is not limited in the embodiments of the present application.

[0326] In a possible implementation, the processing unit 701 is further configured to determine that the first condition is met or the second condition is not met, and not perform any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for the beam failure recovery.

[0327] Optionally, the processing unit 701 can also be understood as follows: the processing unit 701 can determine whether a first condition or a second condition is met; and then determine whether to perform detection of a physical layer problem, or detection of a radio link failure, or initialization of RRC connection reestablishment, according to whether the first condition is met.

[0328] In a possible implementation, the first condition includes any one or more of the following: the terminal device expects to leave the RRC connected state; the terminal device initiates a procedure of leaving the RRC connected state; the terminal device sends first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and a first timer is running, the first timer being used to control the terminal device to leave the RRC connected state.

[0329] In a possible implementation, the second condition includes any one or more of the following: the terminal device does not expect to leave the RRC connected state; the terminal device does not initiate the procedure of leaving the RRC connected state; the terminal device does not send the first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and the first timer is not running, the first timer being used to control the terminal device to leave the RRC connected state.

[0330] In a possible implementation, the processing unit 701 is further configured to start or restart the first timer in a case where one or more of the following conditions are met: the terminal device initiates the procedure of leaving the RRC connected state; the terminal device sends the first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; and the terminal device successfully sends the first indication information to the network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state.

[0331] In a possible implementation, the processing unit 701 is further configured to stop the first timer in a case where the RRC release message sent by the network device is received; or the processing unit 701 is further configured to stop the first timer in a case where the first timer times out.

[0332] In a possible implementation, the processing unit 701 is specifically configured to initiate the RRC connection reestablishment in a case where at least one of the third conditions is met and at least one of the fourth conditions is not met.

[0333] The third condition includes: a detected radio link failure, a detected synchronization reconfiguration failure, a detected failure of moving from new radio (NR), a received integrity protection check failure from a lower layer, or a detected RRC connection reconfiguration failure; and the fourth condition includes: an access stratum (AS) security that is not activated, an AS security that is activated but a signaling radio bearer (SRB2) and at least one data radio bearer (DRB) are not established, or an SRB2 is not established in an integrated access and backhaul (IAB) scenario.

[0334] In a possible implementation, the processing unit 701 is specifically configured to detect that a master base station MN or a master cell group MCG in dual connectivity DC has a radio link failure; or, detect that a secondary base station SN or a secondary cell group SCG in dual connectivity DC has a radio link failure.

[0335] In the embodiments of the present application, the descriptions of the first condition, the second condition, the radio link failure, the initialization of the RRC connection reestablishment, the cell reselection, the sending of the RRC reestablishment request message, the beam failure, the beam failure recovery, etc. can also refer to the descriptions in the above method embodiments, which will not be repeated here.

[0336] It can be understood that the specific descriptions of the transceiver unit 702 and the processing unit 701 shown in the embodiments of the present application are only examples. For the specific functions or executed steps of the transceiver unit 702 and the processing unit 701, etc., reference can be made to the above method embodiments, which will not be described in detail here.

[0337] Multiplexing Figure 7 In some other embodiments of the present application, the communication apparatus can be a terminal device or a chip in a terminal device shown above, etc. For example, the communication apparatus can be used to execute the method shown in the above method embodiments, such as the method shown in the above method embodiments. Figure 6 For example, the communication apparatus can be used to execute the related methods shown in Tables 1 to 3, etc. in the above method embodiments.

[0338] The transceiver unit 702 is configured to receive first indication information sent by a network device, the first indication information being used to indicate whether a first criterion is combined with a second criterion, the first criterion being a criterion for detecting whether the terminal device is static, and the second criterion being a criterion for detecting whether the terminal device is not at the edge of a cell.

[0339] The processing unit 701 is configured to determine whether the first criterion is met or whether the first criterion and the second criterion are met according to the above first indication information.

[0340] In a possible implementation, the transceiver unit 702 is further configured to receive information sent by the network device for indicating the first criterion and / or information for indicating the second criterion.

[0341] In a possible implementation, the processing unit 701 is further configured to, if the first indication information indicates that the first criterion is not combined with the second criterion, determine whether the first criterion is met; if the terminal device meets the first criterion, perform measurement relaxation in a first measurement relaxation manner; or, if the terminal device does not meet the first criterion, do not perform measurement relaxation.

[0342] In one possible implementation, the processing unit 701 is further configured to determine whether the first criterion or the first and second criteria are satisfied if the first indication information indicates that the first criterion is combined with the second criterion; if the terminal device satisfies the first and second criteria, then measurement relaxation is performed according to the second measurement relaxation method; or, if the terminal device does not satisfy the first and second criteria, then measurement relaxation is not performed.

[0343] In one possible implementation, the processing unit 701 is further configured to: if the first indication information indicates that the first criterion is combined with the second criterion, determine whether the first criterion or the first and second criteria are satisfied; if the terminal device determines that the first and second criteria are satisfied, then perform measurement relaxation according to the second measurement relaxation method; if the terminal device determines that the first and second criteria are not satisfied, but the first criterion is satisfied, then perform measurement relaxation according to the first measurement relaxation method; if the terminal device determines that the first and second criteria are not satisfied, and the first criterion is not satisfied, then no measurement relaxation is performed.

[0344] In one possible implementation, the transceiver unit 702 is further configured to receive second indication information sent by the network device, the second indication information being used to indicate whether the terminal device is allowed to perform measurement relaxation when the terminal device only meets the first criterion.

[0345] In one possible implementation, the second instruction information indicates that the terminal device is not allowed to perform measurement relaxation when the terminal device only meets the first criterion.

[0346] In one possible implementation, the second instruction information indicates that the terminal device is allowed to perform measurement relaxation when the terminal device only meets the first criterion.

[0347] In one possible implementation, the first criterion corresponds to the first protocol version, and the second criterion corresponds to the second protocol version.

[0348] It is understood that the specific descriptions of the transceiver unit and processing unit shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver unit and processing unit, please refer to the above method embodiments (such as...). Figure 6 (This will not be elaborated on here.)

[0349] The terminal device of the embodiments of this application has been described above. The possible product forms of the terminal device are described below. It should be understood that any device possessing the above-described features... Figure 7 Any form of product that provides the functionality of the terminal device described herein falls within the protection scope of the embodiments of this application. It should also be understood that the following description is merely illustrative and does not limit the product form of the terminal device in the embodiments of this application to this specific example.

[0350] In one possible implementation, Figure 7In the illustrated communication apparatus, the processing unit 701 can be one or more processors, and the transceiver unit 702 can be a transceiver, or the transceiver unit 702 can also be a transmitting unit and a receiving unit, the transmitting unit can be a transmitter, and the receiving unit can be a receiver, and the transmitting unit and the receiving unit are integrated in one device, for example, a transceiver. In an embodiment of the present application, the processor and the transceiver can be coupled, and the connection manner between the processor and the transceiver is not limited in the embodiment of the present application.

[0351] As shown in Figure 8 The communication apparatus 80 includes one or more processors 820 and a transceiver 810.

[0352] In some embodiments of the present application, the processor 820 is configured to determine whether a first condition is met or whether a second condition is met, and perform any one or more of the following in a case that the first condition is not met or the second condition is met, and not perform any one or more of the following in a case that the first condition is met or the second condition is not met: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing RRC connection reestablishment, performing cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing beam failure recovery, and initiating random access for beam failure recovery.

[0353] It can be understood that the specific description of the processor and the transceiver can also refer to the transceiver unit and the processing unit described above, and will not be described in detail here.

[0354] In some other embodiments of the present application, the transceiver 810 is configured to receive first indication information sent by a network device, and the processor 820 is configured to determine whether a first criterion is met or whether a first criterion and a second criterion are met according to the first indication information.

[0355] It can be understood that the specific description of the processor and the transceiver can also refer to the transceiver unit and the processing unit described above, and will not be described in detail here.

[0356] In Figure 8 In various embodiments of the illustrated communication apparatus, the transceiver can include a receiver configured to perform the functions (or operations) of receiving, and a transmitter configured to perform the functions (or operations) of transmitting. The transceiver is configured to communicate with other devices / apparatuses over a transmission medium.

[0357] Optionally, the communication device 80 can further include one or more memories 830 for storing program instructions and / or data. The memory 830 is coupled to the processor 820. The coupling between the various means, units or modules in the embodiments of the present application can be indirect coupling or communication connection between the means, units or modules, which can be electrical, mechanical or other forms, for information interaction between the means, units or modules. The processor 820 can operate in cooperation with the memory 830. The processor 820 can execute the program instructions stored in the memory 830. Optionally, at least one of the one or more memories can be included in the processor.

[0358] The specific connection medium between the transceiver 810, the processor 820 and the memory 830 in the embodiments of the present application is not limited. In the embodiments of the present application, the memory 830, the processor 820 and the transceiver 810 are connected through a bus 840, and the bus is represented by a thick line in the figure, and the connection mode between other components is only schematically illustrated and is not limited. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, only one thick line is used to represent the bus in the figure, but it does not mean that there is only one bus or only one type of bus. Figure 8 Figure 8 The connection mode between other components is only schematically illustrated and is not limited. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, only one thick line is used to represent the bus in the figure, but it does not mean that there is only one bus or only one type of bus. Figure 8

[0359] In the embodiments of the present application, the processor can be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as execution completed by a hardware processor, or executed by a combination of hardware and software modules in the processor, etc.

[0360] ​​The memory in the embodiments of the present application can include, but is not limited to, a non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), a random access memory (RAM), an erasable programmable ROM (EPROM), a read-only memory (ROM), a compact disc read-only memory (CD-ROM), and the like. The memory is any storage medium that can be used to carry or store program codes in the form of instructions or data structures and can be read and / or written by a computer (such as the communication device shown in the embodiments of the present application and the like). The memory in the embodiments of the present application can also be a circuit or any other device capable of realizing a storage function, used for storing program instructions and / or data.

[0361] The processor 820 is mainly used for processing communication protocols and communication data, controlling the whole communication device, executing software programs, and processing data of the software programs. The memory 830 is mainly used for storing software programs and data. The transceiver 810 can include a control circuit and an antenna, and the control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, and the like, are mainly used for receiving user input data and outputting data to users.

[0362] When the communication device is powered on, the processor 820 can read the software program in the memory 830, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be transmitted wirelessly, the processor 820 performs baseband processing on the data to be transmitted, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit converts the baseband signal into a radio frequency signal, and transmits the radio frequency signal in the form of electromagnetic waves through the antenna. When data is transmitted to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 820. The processor 820 converts the baseband signal into data and processes the data.

[0363] In another implementation, the radio frequency circuit and the antenna can be arranged independently of the processor performing baseband processing, for example, in a distributed scenario, the radio frequency circuit and the antenna can be arranged remotely from the communication device.

[0364] It can be understood that the communication device shown in the embodiments of the present application can also have more or fewer components than those shown in the figure. Figure 8More components, etc. The processor and transceiver perform the method shown above are only examples, for the processor and transceiver specific steps can be performed by reference to the method described above.

[0365] In another possible implementation, Figure 7 The communication device shown, the processing unit 701 can be one or more logic circuits, transceiver unit 702 can be an input and output interface, also known as a communication interface, or interface circuit, or interface, etc. Or transceiver unit 702 can also be a sending unit and a receiving unit, the sending unit can be an output interface, the receiving unit can be an input interface, the sending unit and the receiving unit are integrated in a unit, such as an input and output interface. For example Figure 9 As shown, Figure 9 The communication device shown includes a logic circuit 901 and an interface 902. As described above, the processing unit 701 can be implemented by the logic circuit 901, and the transceiver unit 702 can be implemented by the interface 902. Among them, the logic circuit 901 can be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc., and the interface 902 can be a communication interface, an input and output interface, a pin, etc. For example, Figure 9 The above communication device is taken as an example of a chip, which includes a logic circuit 901 and an interface 902.

[0366] In the embodiments of the present application, the logic circuit and the interface can also be coupled to each other. The specific connection mode of the logic circuit and the interface is not limited in the embodiments of the present application.

[0367] For example, the logic circuit 901 is configured to determine whether a first condition is met or a second condition is met; in the case that the first condition is not met or the second condition is met, any one or more of the following is performed; in the case that the first condition is met or the second condition is not met, any one or more of the following is not performed:

[0368] Detecting a physical layer problem of a terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, and initiating a random access for beam failure recovery.

[0369] It can be understood that the logic circuit can perform the step of sending the RRC reestablishment request message through the interface, or perform the step of initiating the random access for beam failure recovery through the interface, etc. The embodiments of the present application do not limit this.

[0370] It can be understood that the communication apparatuses shown in the embodiments of the present application can implement the methods provided by the embodiments of the present application in the form of hardware, or implement the methods provided by the embodiments of the present application in the form of software, and the like, and the embodiments of the present application do not limit this.

[0371] For Figure 9 For the specific implementation of each embodiment shown in the above, reference can be made to the above embodiments, and details are not described herein.

[0372] In addition, the present application also provides a computer program for implementing the operations and / or processes performed by the terminal device in the method provided by the present application.

[0373] The present application also provides a computer readable storage medium having a computer program stored therein, when the computer program runs on a computer, the computer program causes the computer to perform the operations and / or processes performed by the terminal device in the method provided by the present application.

[0374] It can be understood that the computer program shown above can also be referred to as a computer program product, or computer code, or instructions, and the like. In several embodiments provided by the present application, it should be understood that the disclosed system, apparatus and method can be implemented in other ways. For example, the apparatus embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can also be electrical, mechanical or other forms of connection.

[0375] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, such as being located in one place, or being distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the technical effects of the solutions provided by the embodiments of the present application.

[0376] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0377] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in various embodiments of the present application. The aforementioned readable storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0378] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method, the method being applied to a terminal device, characterized by, The method comprises: determining that a first condition is not met or determining that a second condition is met, the first condition being used to indicate that the terminal device expects to leave a radio resource control (RRC) connected state, and the second condition being used to indicate that the terminal device does not expect to leave the RRC connected state; performing any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing an RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, initiating a random access for beam failure recovery; wherein the first condition comprises at least one of the following: the terminal device sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; a first timer is running, the first timer being used to control the terminal device to leave the RRC connected state; the second condition comprises at least one of the following: the terminal device does not send first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; a first timer is not running, the first timer being used to control the terminal device to leave the RRC connected state.

2. The method of claim 1, wherein, The method further comprises: determining that the first condition is met or determining that the second condition is not met; not performing any one or more of the following: detecting a physical layer problem of the terminal device, detecting a radio link failure, initializing the RRC connection reestablishment, performing a cell reselection, sending an RRC reestablishment request message, detecting a beam failure, performing a beam failure recovery, initiating a random access for beam failure recovery.

3. The method of claim 1, wherein, start or restart the first timer in a case where one or more of the following conditions are met: the terminal device initializes a procedure of leaving the RRC connected state; the terminal device sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state; the terminal device successfully sends first indication information to a network device, the first indication information being used to indicate that the terminal device expects to leave the RRC connected state.

4. The method of claim 3, wherein, stop the first timer in a case where an RRC release message sent by a network device is received; or stop the first timer in a case where the first timer times out.

5. The method according to any of claims 1-2, characterized by, The initializing the RRC connection reestablishment comprises: initializing the RRC connection reestablishment in a case where at least one of a third condition is met and at least one of a fourth condition is not met; the third condition comprises: detecting a radio link failure, detecting a synchronization reconfiguration failure, detecting a failure of moving from new radio (NR), detecting a failure of receiving integrity protection check from a lower layer, detecting a failure of the RRC connection reconfiguration; the fourth condition comprises: access stratum (AS) security is not activated, AS security is activated but a signaling radio bearer (SRB2) and at least one data radio bearer (DRB) are not established, or SRB2 is not established in an integrated access and backhaul (IAB) scenario.

6. The method according to any one of claims 1-2, characterized in that, The detecting a radio link failure comprises: detecting a radio link failure of a master base station MN or a master cell group MCG in dual connectivity DC; or detecting a radio link failure of a secondary base station SN or a secondary cell group SCG in dual connectivity DC.

7. A communication device, characterized by comprising a processor and a memory; the memory is configured to store a computer program; the processor is configured to execute the computer program to cause the method of any one of claims 1-6 to be performed.

8. A communication device, characterized by comprising a logic circuit and an interface, the logic circuit and the interface being coupled; the interface is configured to input and / or output code instructions, and the logic circuit is configured to execute the code instructions to cause the method of any one of claims 1-6 to be performed.

9. A computer-readable storage medium, characterized in that, the computer readable storage medium is configured to store a computer program that, when executed, causes the method of any one of claims 1-6 to be performed.

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