Communication method and apparatus

Abstract

Provided are a communication method and apparatus. The method comprises: if a cell reselected by a terminal device during cell reselection is a resident cell at a current moment, the terminal device determining that the cell reselection is abnormal; the terminal device sending first information to a network device, the first information being used to indicate that the cell reselection is abnormal; the network device adjusting a cell reselection parameter on the basis of the first information. The terminal device can send to the network device the first information used to indicate that the cell reselection is abnormal, and the network device can then adjust the cell reselection parameter on the basis of the first information, such that the frequency of the terminal device executing invalid events is reduced, thereby reducing power consumption waste of the terminal device.

Description

Communication method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on December 29, 2023, with application number 202311867660.5 and application name "A Communication Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communications, and in particular to a communication method and device. Background Art

[0004] In the mobility management of terminal devices, the radio resource control (RRC) states of terminal devices include the following three states: connected state, idle state, and inactive state. When the cell is in the idle state and inactive state, the mobility management of the terminal device includes cell reselection. The overall process of cell reselection includes three stages: cell measurement (or neighboring cell measurement), reselection decision evaluation (evaluation and judgment on whether to perform cell reselection to the neighboring cell), and cell reselection execution (including staying in the reselected cell). Among them, in the two stages of cell measurement and reselection decision evaluation, the terminal device determines whether it meets the cell reselection criteria based on the measured signal quality of multiple cells. If it meets the criteria, it will execute cell reselection. If it does not meet the criteria, it will still stay in the current cell.

[0005] Based on the above method, the terminal device frequently starts neighboring cell measurement and reselection decision evaluation, resulting in a large amount of power consumption waste of the terminal device. Summary of the Invention

[0006] An embodiment of the present application provides a communication method and apparatus, in which a terminal device reports information indicating cell reselection anomalies to a network device, so that the network device can adjust cell reselection parameters, reduce the frequency of invalid events executed by the terminal device, and thus reduce power consumption waste of the terminal device.

[0007] In a first aspect, the present application provides a communication method that can be applied to a terminal device, or a component (such as a processor, chip, chip system, circuit, or other) in the terminal device, or a software module. Taking the application of the method to the terminal device as an example, the method may include: when the cell reselected by the terminal device is the current resident cell during a cell reselection process, the terminal device determines that the cell reselection is abnormal; and the terminal device sends first information to a network device, where the first information is used to indicate the cell reselection abnormality.

[0008] By adopting this method, the terminal device can send first information indicating cell reselection abnormality to the network device, so that the network device can adjust the cell reselection parameters, thereby reducing the frequency of invalid events executed by the terminal device and reducing power consumption waste of the terminal device.

[0009] In one possible design, the first information may include at least one of the following: path information of the terminal device; speed information of the terminal device; location information of the terminal device; indication information of whether the terminal device is in a low-speed mobile state, where the terminal device is in a low-speed mobile state when: within a first time period, the change in the signal quality measurement result of the resident cell is less than or equal to a first threshold; indication information of whether the terminal device is in the center of the cell, where the terminal device is in the center of the cell when: the signal quality measurement result of the resident cell is greater than or equal to a second threshold; indication information of whether to start relaxation measurement; the time when cell measurement is started during cell reselection; the time when relaxation measurement is started during cell reselection the time when the mobile station reselects to the resident cell during the process; the time when the first information is sent; the time difference between the time when the cell measurement is started and the time when the mobile station reselects to the resident cell; the time difference between the time when the cell measurement is started and the time when the first information is sent; the time difference between the time when the mobile station reselects to the resident cell and the time when the first information is sent; the identification information of the resident cell; the signal quality measurement result of the resident cell; the R criterion calculation result of the resident cell; the S criterion calculation result of the resident cell; the identification information of at least one cell other than the resident cell; the signal quality measurement result of at least one cell; the R criterion calculation result of at least one cell; or, the S criterion calculation result of at least one cell.

[0010] With this design, the first information can reflect the parameter information of the terminal device when the cell reselection is abnormal in many aspects, so that the network device can accurately adjust the cell reselection parameters after receiving the first information.

[0011] In one possible design, before the terminal device sends the first information to the network device, the terminal device may also receive first indication information from the network device; the first indication information is used to instruct the recording of the first information when a cell reselection anomaly is detected. With this design, the terminal device can record the first information when a cell reselection anomaly occurs based on the first indication information from the network device.

[0012] In one possible design, the method for a terminal device to determine a cell reselection abnormality may include: determining a cell reselection abnormality when the cell reselected by the terminal device is a resident cell and meets at least one of the following conditions: within a first time period, a change in a signal quality measurement result of the resident cell is less than or equal to a first threshold; or, a signal quality measurement result of the resident cell is greater than or equal to a second threshold.

[0013] With this design, the terminal device can determine cell reselection anomalies based on different conditions, thereby accurately sending the first information to the network device so that the network device can accurately adjust the cell reselection parameters and reduce power consumption waste of the terminal device.

[0014] In a second aspect, the present application provides a communication method that can be applied to a network device, or a component (such as a processor, chip, chip system, circuit, or other) in the network device, or a software module. Taking the application of the method to the network device as an example, the method may include: the network device receiving first information from a terminal device; the first information being used to indicate a cell reselection anomaly; and the network device adjusting cell reselection parameters based on the first information.

[0015] By adopting this method, the network device can adjust the cell reselection parameters according to the first information, thereby reducing the frequency of the terminal device executing invalid events and reducing the power consumption waste of the terminal device.

[0016] In one possible design, the cell reselection parameter may include a cell measurement start threshold. With this design, the network device can adjust the cell measurement start threshold, thereby optimizing (increasing or decreasing) the frequency of cell measurement performed by the terminal device and reducing unnecessary power consumption of the terminal device.

[0017] In one possible design, the first information may include at least one of the following: path information of the terminal device; speed information of the terminal device; location information of the terminal device; indication information of whether the terminal device is in a low-speed mobile state, where the terminal device is in a low-speed mobile state when: within a first time period, the change in the signal quality measurement result of the resident cell is less than or equal to a first threshold; indication information of whether the terminal device is in the center of the cell, where the terminal device is in the center of the cell when: the signal quality measurement result of the resident cell is greater than or equal to a second threshold; indication information of whether the terminal device starts relaxation measurement; the moment when the terminal device starts cell measurement during cell reselection; the moment when the terminal device starts cell measurement during cell reselection The time point when the terminal equipment reselects to the resident cell during the process; the time point when the terminal equipment sends the first information; the time difference between the time point when the cell measurement is started and the time point when the resident cell is reselected; the time difference between the time point when the cell measurement is started and the time point when the first information is sent; the time difference between the time point when the resident cell is reselected and the time point when the first information is sent; the identification information of the resident cell; the signal quality measurement result of the resident cell; the R criterion calculation result of the resident cell; the S criterion calculation result of the resident cell; the identification information of at least one cell other than the resident cell; the signal quality measurement result of at least one cell; the R criterion calculation result of at least one cell; or, the S criterion calculation result of at least one cell.

[0018] With this design, the first information can reflect the parameter information of the terminal device when the cell reselection is abnormal in many aspects, so that the network device can accurately adjust the cell reselection parameters after receiving the first information.

[0019] In one possible design, the network device may further send first indication information to the terminal device, where the first indication information is used to instruct the terminal device to record first information when a cell reselection anomaly is detected. With this design, the terminal device may record the first information when a cell reselection anomaly is detected based on the first indication information from the network device.

[0020] In a third aspect, the present application provides a communication method, which can be applied to a terminal device, or a component (such as a processor, chip, chip system, circuit, or other) in the terminal device, or a software module. Taking the application of this method to the terminal device as an example, the method may include: when a radio resource control (RRC) connection establishment or RRC connection recovery is initiated in a first cell, and the RRC connection establishment or RRC connection recovery fails, generating second information, where the second information is related to a multicast broadcast service (MBS) service.

[0021] By adopting this method, the terminal device can record the second information related to the MBS service, so that the network device can optimize the frequency coverage of the MBS service based on the second information, or optimize the cell's support for the MBS service, thereby improving the user experience of the MBS service.

[0022] In one possible design, when the first cell is the cell to which the terminal device reselects during the cell reselection process, and the first cell supports MBS services; the second information includes at least one of the following: second indication information, the second indication information is used to indicate whether the terminal device will regard the frequency supporting the MBS service as the highest priority during the cell reselection process; service identification information corresponding to service data of at least one MBS service being received; service identification information corresponding to service data of at least one MBS service expected to be received; indication information of whether the first cell supports MBS services; or, service identification information of at least one MBS service supported by the first cell.

[0023] In one possible design, the cell to which the terminal device reselects during the cell reselection process is the second cell, and the second cell does not support MBS services; the second information includes at least one of the following: second indication information, the second indication information is used to indicate whether the terminal device will take the frequency supporting MBS services as the highest priority during the cell reselection process; service identification information corresponding to service data of at least one MBS service being received; service identification information corresponding to service data of at least one MBS service expected to be received; indication information of whether the first cell supports MBS services; service identification information of at least one MBS service supported by the first cell; indication information of whether the second cell supports MBS services; service identification information of at least one MBS service supported by the second cell; or, third indication information, the third indication information is used to indicate that the second cell does not support MBS services, and the purpose of entering the RRC connection state in the first cell is to enable the network device to which the first cell belongs to send MBS service data to the terminal device in a unicast manner.

[0024] In a fourth aspect, the present application further provides a communication device. The communication device can execute the methods described in the first, second, or third aspects above, or the solutions in each possible design. The communication device can be a chip or circuit capable of executing the functions corresponding to the above methods, or a device including the chip or circuit.

[0025] In one possible design, the communication device includes a communication unit for receiving and sending data; the communication device also includes a processing unit for implementing the method in any possible design described in the first, second, or third aspects above. The aforementioned functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the aforementioned functions.

[0026] In a fifth aspect, the present application further provides a communication device. The communication device can execute the method described in the first, second, or third aspects above, or the solutions in each possible design. The communication device includes: a processor. When the processor executes instructions, the communication device or a device equipped with the communication device executes the method described in any possible design of the first, second, or third aspects above.

[0027] Optionally, the communication device may further include a memory for storing computer-executable program code, and the program agent may include the aforementioned instructions. The memory may be located inside or outside the communication device, which is not limited in this application. The memory may be coupled to the processor.

[0028] The communication device may further include a communication interface. Optionally, if the communication device is a chip or a circuit, the communication interface may be an input / output interface of the chip, such as an input / output pin.

[0029] In a sixth aspect, the present application provides a communication system, which includes a terminal device that executes the method of the first aspect and / or one or more devices in a network device that executes the method of the second aspect; or, the communication system includes a terminal device that executes the method of the third aspect.

[0030] In the seventh aspect, the present application provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a computer, it enables the computer to execute a method in any possible design shown in the first aspect, second aspect or third aspect above.

[0031] In an eighth aspect, the present application provides a computer program product, in which a computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called by a computer, the computer executes a method in any possible design shown in the first aspect, second aspect or third aspect above.

[0032] In a ninth aspect, the present application provides a chip comprising a processor for executing the method in any one of the possible designs shown in the first, second, or third aspects above. Optionally, the chip may further comprise a communication interface for inputting and / or outputting signaling or data. Optionally, the chip may further comprise a memory for storing the aforementioned computer program; the processor is coupled to the memory, and the processor may read the computer program stored in the memory to execute the method in any one of the possible designs shown in the first, second, or third aspects above.

[0033] In addition, the technical effects brought about by the fourth to ninth aspects can be found in the descriptions of the various possible solutions in the first to third aspects above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0035] FIG2 is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application;

[0036] FIG3 is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application;

[0037] FIG4 is a flow chart of a communication method provided in an embodiment of the present application;

[0038] FIG5 is a flow chart of another communication method provided in an embodiment of the present application;

[0039] FIG6 is a flow chart of another communication method provided in an embodiment of the present application;

[0040] FIG7 is a flow chart of another communication method provided in an embodiment of the present application;

[0041] FIG8 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0042] FIG9 is a schematic structural diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and beneficial effects of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0044] In the description of this application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of this application, “at least one” means one or more items, and “multiple items” means two or more items. In the description of this application, words such as “first” and “second” are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0045] FIG1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. As shown in FIG1 , the communication system includes a radio access network 100 and a core network (CN) 200. Optionally, the communication system 1000 may also include the Internet 300. The radio access network 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a fourth generation (4G) or fifth generation (5G) mobile communication system, a non-terrestrial network (NTN) system, or a future-oriented evolution system (such as a sixth generation (6G) mobile communication system). The radio access network 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system, or a communication system that integrates two or more of the above systems.

[0046] The radio access network 100 may include at least one radio access network (RAN) device (such as 110a and 110b in FIG. 1 ) (also known as a RAN entity or RAN node), and may also include at least one terminal device (such as 120a-120j in FIG. 1 ). The terminal device is wirelessly connected to the radio access network device, and the radio access network device is wirelessly or wiredly connected to the core network. The core network device and the radio access network device may be independent and distinct physical devices, or the core network device's functions and the radio access network device's logical functions may be integrated into the same physical device, or a single physical device may integrate some of the core network device's functions and some of the radio access network device's functions. Terminal devices and radio access network devices may be interconnected via wired or wireless connections. FIG. 1 is merely a schematic diagram, and the communication system may also include other radio access network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG.

[0047] A wireless access network device may be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a transmission point (TP), a next-generation NodeB (gNB) in a 5G mobile communication system, a next-generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system; it may also be a module or unit that performs part of the functions of a base station, for example, a centralized unit (CU) or a distributed unit (DU).

[0048] The wireless access network device can be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), a relay node or a donor node, or a wireless controller in a CRAN scenario, etc. Optionally, the RAN node can also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the access network device in the vehicle to everything (V2X) communication technology can be a road side unit (RSU). The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For the sake of convenience of description, the following description takes the base station as an example of the wireless access network device.

[0049] In some network structures, as shown in Figure 2 or Figure 3, a base station (e.g., a gNB) may include a CU and a DU; the gNB may also include a radio unit (RU). The CU, DU, or RU may have different names in different systems, but those skilled in the art will understand their meanings. For example, in an ORAN system, the CU may also be referred to as an open access network CU (ORAN-CU, O-CU), the DU may also be referred to as an open access network DU (ORAN-DU, O-DU), and the RU may also be referred to as an open access network RU (ORAN-RU, O-RU). The following is an exemplary description of some of the functions of the CU / DU and RU:

[0050] The CU can complete the functions of the radio resource control (RRC) layer, the radio resource control protocol and the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP).

[0051] The DU can perform the functions of the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer, and can also perform some or all of the physical layer functions. The high-level functions of the physical layer include one or more of the following: feedforward error correction (FEC) encoding / decoding, scrambling / descrambling, or modulation / demodulation.

[0052] The RU can be divided based on low-layer functions to implement the low-layer (near-RF) and RF functions of the PHY in the 3GPP standard. The low-layer functions of the physical layer include one or more of the following: fast Fourier transform (FFT) / inverse fast Fourier transform (iFFT), digital beamforming, or physical random access channel (PRACH) extraction and filtering. It is similar to a transmission reception point (TRP) or remote radio head (RRH) in 3GPP, but includes low-layer PHY functions such as FFT / iFFT or PRACH extraction.

[0053] For detailed descriptions of the above protocol layers, please refer to the relevant technical specifications of 3GPP.

[0054] A base station that includes both a CU and a DU splits the base station's protocol layer. Some protocol layer functions are centrally controlled by the CU, while some or all of the remaining protocol layer functions are distributed in the DU, which is then centrally controlled by the CU. For example, the CU and DU can be included in the same network element (e.g., a baseband unit (BBU)). The CU implements some gNB functions, while the DU implements some gNB functions. The RU can be included in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0055] As shown in (a) of Figure 2, the CU can be divided into the CU control plane (CU-(control panel, CP)) and the CU user plane (CU-(user panel, UP)). In the ORAN system, the CU-CP can also be called the open access network CU-CP (ORAN-CU-CP, O-CU-CP), and the CU-UP can also be called the open access network CU-UP (ORAN-CU-UP, O-CU-UP). Among them, the CU-CP is responsible for the control plane functions, mainly including the functions of RRC and PDCP-control plane (control, C). The CU control plane CU-CP can also include a further divided architecture, that is, the CU-CP is further divided into CU-CP1 and CU-CP2. Among them, CU-CP1 includes various radio resource management functions, and CU-CP2 only includes RRC functions and PDCP-C functions (that is, the basic functions of control plane signaling at the PDCP layer). The CU-UP is responsible for the user plane functions, mainly including SDAP and PDCP-user plane (user, U) functions. The CU-CP and CU-UP are connected through the E1 interface. CU-CP represents that CU is connected to the core network through the Ng interface and is connected to DU through F1-control plane (control, C). CU-UP is connected to DU through F1-user plane (user, U). Of course, another possible implementation is that PDCP-C is also in CU-UP. In other examples, as shown in (b) in Figure 2, CU implements the functions of RRC layer, PDCP layer, and SDAP layer. As shown in Figure 2, DU implements the functions of RLC layer, MAC layer and PHY layer. It can be understood that the base station can be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, CU can be divided into a network device in the access network RAN, or CU can be divided into a network device in the core network, and there is no limitation on this.

[0056] For example, multiple DUs can share a CU. In a RAN sharing scenario, a DU can also connect to multiple CUs. CUs and DUs can be connected via the F1 interface. A DU can manage one or more cells, each with a corresponding cell identifier.

[0057] Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented through a software module, a hardware module, or a combination of a software module and a hardware module.

[0058] In some embodiments, in addition to the case where the base station is composed of a CU and a DU, that is, in addition to the case where the CU and DU are deployed together, the CU and DU can also be physically separated. In other words, the CU and DU can be considered as two separate nodes. In this case, the network device can be a CU.

[0059] It is understandable that the above functional division is only an example and does not constitute a limitation on the CU and DU. In other words, there may be other functional divisions between the CU and DU, which are not detailed in this application.

[0060] In some embodiments, the base station in Figure 2 or Figure 3 may be a base station in an ORAN system. Accordingly, the CU may be replaced by an O-CU, which includes an O-CU-CP and an O-CU-UP; the DU may be replaced by an O-DU; and the RU may be replaced by an O-RU. The functions of the O-CU, O-CU-CP, O-CU-UP, O-DU, and O-RU are similar to those of the aforementioned CU, CU-CP, CU-UP, DU, and RU, respectively, and can be referenced in conjunction with each other.

[0061] Terminal devices may also be referred to as user equipment (UE), mobile stations, mobile terminal devices, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. Terminal devices may be mobile phones, tablet computers, computers with wireless transceiver functions, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, sensors, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal devices.

[0062] The above-mentioned terminal device can establish a connection with the operator network through the interface provided by the operator network (such as N1, etc.) and use the data and / or voice services provided by the operator network. The terminal device can also access the domain name system (DNS) through the operator network, use the operator services deployed on the DNS, and / or services provided by a third party. Among them, the above-mentioned third party may be a service provider other than the operator network and the terminal device, and can provide other data and / or voice services to the terminal device. Among them, the specific form of the above-mentioned third party can be determined according to the actual application scenario and is not limited here.

[0063] Base stations and terminal devices can be fixed or mobile. They can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of base stations and terminal devices.

[0064] The roles of base stations and terminal devices can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For terminal devices 120j accessing the wireless access network 100 via 120i, terminal device 120i is a base station. However, for base station 110a, 120i is a terminal device, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via a base station-to-base station interface protocol. In this case, 120i is also a base station relative to 110a. Therefore, base stations and terminal devices can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be referred to as communication devices with base station functionality, and 120a-120j in Figure 1 can be referred to as communication devices with terminal functionality.

[0065] Communication between base stations and terminal devices, between base stations, and between terminal devices can be carried out through authorized spectrum, unauthorized spectrum, or both; communication can be carried out through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0066] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem that includes the base station functions. The control subsystem that includes the base station functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device that includes the terminal device functions.

[0067] Each base station manages at least one cell. Each cell uses corresponding spectrum resources to provide access services to terminal devices. The cell where a terminal device resides is called the resident cell. To communicate with a base station, a terminal device must establish a wireless connection with the cell controlled by the base station. The cell with which the terminal device has established a wireless connection is called the resident cell (or serving cell) of the terminal device.

[0068] The core network involved in the embodiments of the present application may include core network equipment that processes and forwards user signaling and data. For example, it includes core network equipment such as access and mobility management function (AMF) network element, session management function (SMF) network element, user plane function (UPF) network element, and positioning management network element. Among them, the user plane function network element can be a server with functions such as mobility management, routing, and forwarding of user plane data, which is generally located on the network side, such as a serving gateway (SGW) or a packet data network gateway (PGW). AMF and SMF are equivalent to the mobility management entity (MME) in the long term evolution (LTE) system. AMF is mainly responsible for access, and SMF is mainly responsible for session management. Of course, the core network may also include other network elements, which are not listed here one by one. It should be noted that in this application, the network element can also be referred to as an entity or a functional entity. For example, the AMF network element can also be referred to as an AMF entity or an AMF functional entity. For example, the SMF network element can also be referred to as an SMF entity or an SMF functional entity, etc.

[0069] To reduce the frequency of invalid events executed by terminal devices during cell reselection, thereby reducing power consumption in terminal devices, an embodiment of the present application provides a communication method. This communication method can be implemented in any of the communication systems shown in Figures 1 to 3 above. It should be understood that Figures 1 to 3 above are only a few possible communication systems, and the communication system of the embodiment of the present application is not limited thereto. The communication method provided in the embodiment of the present application will be described below with reference to the accompanying drawings.

[0070] FIG4 is a communication method provided in an embodiment of the present application, which may include the following steps:

[0071] S401: When the cell reselected by the terminal device during the cell reselection process is the current camped cell, the terminal device determines that the cell reselection is abnormal. In the embodiment of the present application, the cell reselection abnormality is also called cell reselection invalid, or cell reselection invalid event.

[0072] The terminal device may be the terminal device in FIG. 1 or FIG. 3 .

[0073] The following briefly describes the cell reselection process. As shown in Figure 5, the cell reselection process includes the neighboring cell measurement phase, the reselection evaluation (decision) phase, and the cell reselection execution phase (including receiving system messages from the new cell). Taking the terminal device's current resident cell as cell A as an example, the cell reselection process is described as follows:

[0074] Start neighboring cell measurement (or cell measurement) (such as time t0 in Figure 5): the terminal device starts neighboring cell measurement based on at least one of the following two factors: the priority of the cell reselection frequency point and the signal quality of the current resident cell. For example, if the priority of the frequency point of the neighboring cell is higher than the priority of the frequency point of the resident cell, the terminal device starts the neighboring cell measurement without considering the strength of the signal quality of the resident cell; for another example, if the priority of the frequency point of the neighboring cell is lower than or equal to the priority of the frequency point of the resident cell, the terminal device measures the signal quality of the resident cell at the current moment, and determines whether to start the neighboring cell measurement based on the signal quality of the resident cell and the starting threshold of the neighboring cell measurement (such as the threshold value for starting the same-frequency measurement, the threshold value for starting the different-frequency or different-system measurement).

[0075] Neighboring cell measurement phase (such as the time period from t0 to t1 in Figure 5): After the neighboring cell measurement is started, the terminal device measures the signal quality of multiple cells (including cell A and the neighboring cells of cell A) of the same frequency, different frequency or different system.

[0076] Reselection evaluation and decision phase (e.g., the time period from t1 to t2 in Figure 5): The terminal device calculates the S criterion calculation results (determines whether the S criterion is met) and the R criterion calculation results (R criterion variable, reflecting the signal quality level of the cell) of the current resident cell and neighboring cells respectively to make a cell reselection evaluation and decision. According to the cell reselection criteria, for any neighboring cell of cell A, it is determined whether the signal quality of the neighboring cell meets the cell reselection criteria. The cell reselection criteria include one or more of the following: cell reselection frequency priority, S criterion, R criterion, reference signal received power (RSRP) difference, and signal to interference plus noise ratio (SINR) difference. For example, for high-priority neighboring cells (neighboring cells with higher priority than the frequency of the resident cell), the terminal device selects the neighboring cell with the highest signal quality level (such as the highest R value) among multiple cells that meet the S criterion as the reselected cell; for neighboring cells of equal priority (neighboring cells with the same priority as the frequency of the resident cell), the terminal device selects the cell with the highest cell signal quality level according to the R criterion among the cells that meet the S criterion (the resident cell and / or the neighboring cell) as the reselected cell; for low-priority neighboring cells (neighboring cells with lower priority than the frequency of the resident cell), when the resident cell does not meet the S criterion and the neighboring cell meets the S criterion, the terminal device selects the neighboring cell as the reselected cell. Optionally, the specific content of the aforementioned cell reselection criteria can also refer to the traditional technology in this field, and this application does not limit it.

[0077] If the reselected cell is a neighboring cell of cell A, the terminal device can enter the cell reselection execution phase (as shown in (a) in Figure 5); if the reselected cell is cell A, the terminal device still resides in cell A and the cell reselection process terminates (as shown in (b) in Figure 5).

[0078] The duration of the time period from t1 to t2, for example, may be the duration of a cell reselection triggering timer. For example, the duration of the time period from t1 to t2 may be referred to as a reselection evaluation and decision time (treselection). During the reselection evaluation and decision phase, the terminal device needs to determine that the reselected cell meets the aforementioned cell reselection criteria during the time period from t1 to t2.

[0079] Cell reselection execution phase (after time t2 in (a) of Figure 5): After the terminal device determines that there is a neighboring cell (not cell A) that meets the cell reselection criteria, the terminal device can try to reside in the neighboring cell. Specifically, the terminal device can search for the neighboring cell and receive the system message of the neighboring cell. The system message includes a system information block (SIB) 21, and the terminal device can obtain the frequency information corresponding to the MBS service provided based on the user service description (USD) and / or SIB21. Taking the reselected cell as cell B as an example, if there is no access restriction (such as judging whether cell B is prohibited, reserved, etc. through the system message of cell B), the terminal device can reside in the neighboring cell, that is, reselect to the neighboring cell. Optionally, the terminal device can also establish an RRC connection in the neighboring cell, that is, the terminal device accesses the network device corresponding to cell B. On the contrary, if access is restricted, the terminal device still resides in the aforementioned cell A.

[0080] In one possible design, when the reselected cell is the current resident cell of the terminal device and satisfies at least one of the following conditions, the terminal device determines that the cell reselection is abnormal: the terminal device is in a low-speed mobile state, that is, it satisfies the low mobility criterion; or the terminal device is in the center of the cell, that is, it satisfies the not at cell edge criterion. The terminal device being in the center of the cell can also be understood as the terminal device being in the middle area of ​​the coverage of the current resident cell.

[0081] Optionally, a method for determining whether the terminal device is in a low-speed mobility state may include but is not limited to: within a first time period, a change in a signal quality measurement result of the resident cell is less than or equal to a first threshold.

[0082] Optionally, a method for determining whether the terminal device is located at the center of a cell may include but is not limited to: a signal quality measurement result of the resident cell is greater than or equal to a second threshold.

[0083] In some embodiments, when the reselected cell is the current resident cell and at least one of the following conditions is met, the terminal device determines that the cell reselection is abnormal: within a first time period, the change in the signal quality measurement result of the resident cell is less than or equal to a first threshold; or, the signal quality measurement result of the resident cell is greater than or equal to a second threshold.

[0084] S402: The terminal device sends first information to the network device; in response, the network device receives the first information from the terminal device, wherein the first information is used to indicate a cell reselection anomaly.

[0085] The network device may be the wireless access network 100 in FIG. 1 , or the base station in FIG. 2 or FIG. 3 , or other network-side devices (network, NW).

[0086] Optionally, the first information may be carried in any RRC message. The RRC message may be, for example, an RRC resume complete message, an RRC reestablishment complete message, an RRC setup complete message, or an RRC reconfiguration complete message.

[0087] Optionally, the first information includes at least one of the following: path information of the terminal device; speed information of the terminal device; location information of the terminal device; indication information of whether the terminal device is in a low-speed mobile state; indication information of whether the terminal device is at the center of the cell; indication information of whether the terminal device has started relaxed measurement; the moment when the terminal device starts cell measurement during cell reselection; the moment when the terminal device reselects to the current resident cell during cell reselection; the moment when the terminal device sends the first information; the time difference between the moment of starting cell measurement and the moment of reselecting to the current resident cell; the time difference between the moment of starting cell measurement and the moment of sending the first information; the time difference between the moment of reselecting to the current resident cell and the moment of sending the first information; identification information of the resident cell; signal quality measurement result of the resident cell; R criterion calculation result of the resident cell; S criterion calculation result of the resident cell; identification information of at least one cell outside the resident cell; signal quality measurement result of the aforementioned at least one cell; R criterion calculation result of the aforementioned at least one cell; or, S criterion calculation result of the aforementioned at least one cell.

[0088] Among them, the method for determining whether the terminal device is in a low-speed mobile state can refer to the above description. The method for determining whether the terminal device is in the center of the cell can refer to the above description. The method for determining whether the terminal device starts relaxed measurement includes but is not limited to: suspending cell measurement; increasing the period of cell measurement. The S criterion calculation result may include one or more of the following: S value, indication information of whether the S criterion is met. The R criterion calculation result may include one or more of the following: R value, indication information of whether the R criterion is met, and sorting indication information based on the R principle. Sorting indication information based on the R principle, that is, indicating the level information corresponding to the cell after sorting multiple cells including the cell based on the R value.

[0089] In some embodiments, as shown in FIG6 , before executing S402 , the terminal device may further execute the following step a1:

[0090] Step a1: The terminal device may also record the first information. For example, the terminal device collects measurement data using a minimization of drive-tests (MDT) mechanism to obtain the first information (eg, parameter information when the cell reselection anomaly occurs).

[0091] Among them, based on different data collection objects, MDT can be divided into management-based MDT and signaling-based MDT. Management-based MDT collects MDT data of terminal devices in a specific area, and the specific area can be specified by a tracking area (TA) / cell global identifier (CGI) list. Signaling-based MDT collects MDT data of a specific terminal device, and the specific terminal device is specified by the operation administration and maintenance (OAM) equipment of the core network. The two main modes of the MDT mechanism are logged MDT mode and immediate MDT mode. The specific implementation method of the MDT mechanism can refer to the traditional technical means in this field and will not be repeated here.

[0092] Optionally, as shown in FIG6 , before executing step a1, the network device may further execute the following step a2:

[0093] Step a2: The network device may also send first indication information (e.g., indication information triggering recording of a cell reselection anomaly) to the terminal device; correspondingly, the terminal device may also receive the first indication information from the network device. The first indication information is used to instruct the terminal device to record the first information when a cell reselection anomaly is detected.

[0094] Optionally, as shown in FIG6 , before executing S402 , the terminal device needs to access the network device in order to perform data transmission with the network device. In other words, the terminal device may also perform the following step a3:

[0095] Step a3: The terminal device can access the network device. In actual application, the method for the terminal device to access the network device can refer to conventional technologies in the art.

[0096] It should be understood that Figure 6 is only one possible example, and the order of executing steps a1 (and a2) and a3 can be interchanged, and this application does not limit this. In addition, the network devices in step a1, the network devices in step a2, and the network devices in step a3 can be the same or different. Figure 6 only illustrates the case where the network devices are the same, but this does not limit this application.

[0097] S403: The network device adjusts the cell reselection parameters according to the first information, wherein the cell reselection parameters are used by the terminal device to perform cell reselection.

[0098] The cell reselection parameters may include a threshold for starting neighboring cell measurement, a period for neighboring cell measurement, and indication information for suspending neighboring cell measurement.

[0099] Using the method shown in S401 to S403 above, the terminal device can send first information indicating a cell reselection anomaly to the network device. The network device can then adjust cell reselection parameters based on the first information, thereby reducing the frequency of invalid events performed by the terminal device and thus reducing power consumption waste of the terminal device. For example, the network device can increase the startup threshold for neighbor cell measurement and increase the period for measuring neighbor cells, thereby reducing the number of neighbor cell measurements performed by the terminal device, thereby saving power consumption of the terminal device.

[0100] FIG7 is another communication method provided in an embodiment of the present application, the method comprising the following steps:

[0101] S701: The terminal device initiates RRC connection establishment or RRC connection recovery in the first cell.

[0102] It should be understood that after the terminal device completes cell reselection, the terminal device may initiate an RRC connection establishment process or an RRC connection recovery process in the first cell, with the purpose of enabling the terminal device to enter an RRC connected state. Specifically, when the terminal device is currently in an RRC idle state, the terminal device initiates an RRC connection establishment process; and when the terminal device is currently in an RRC inactive state, the terminal device initiates an RRC connection recovery process.

[0103] Before executing step S701, the terminal device may perform a cell reselection process (cell measurement phase and reselection evaluation and decision phase) to determine the reselected cell. Optionally, the aforementioned cell reselection process performed by the terminal device may be an operation performed after S403. Based on different results of cell reselection, this application discusses the following two cases:

[0104] Case 1: The cell reselected by the terminal device is the aforementioned first cell, and the first cell supports the MBS service.

[0105] It should be understood that in the following case, the cell (first cell) to which the terminal device reselects can support the MBS service, and the terminal device can execute S701 in order to enable the terminal device to access the network device to which the first cell belongs.

[0106] Case 2: The cell reselected by the terminal device is the second cell, and the second cell does not support the MBS service. It should be understood that the second cell is different from the aforementioned first cell.

[0107] It should be understood that in case two, the cell (second cell) to which the terminal device reselects does not support MBS services. The terminal device can execute S701 to enable the terminal device to access the network device to which the first cell belongs, so that the network device to which the first cell belongs can send MBS service data to the terminal device via unicast.

[0108] Optionally, in case 2, the first cell may be the cell where the terminal device is currently stationed.

[0109] Based on the actions in the aforementioned situation 2, if a cell (for example, the second cell) to which the terminal device reselects does not support a certain MBS service, before reselecting to the cell, the terminal device can enter the RRC connection state with the network device to which the first cell belongs, and request to send MBS service data via unicast to ensure the continuity of the MBS service, thereby ensuring that the terminal device's communication service is not affected.

[0110] In some instances, in a multicast broadcast services (MBS) scenario, terminal devices in an idle state and an inactive state may prioritize neighboring cell measurements based on the frequency of the MBS service to perform cell reselection. For example, in an MBS scenario, terminal devices in an idle state and an inactive state may perform cell reselection based on the priority of the frequency of the MBS service currently supported by the terminal device. For example, when a terminal device reselects a cell, the frequency of the MBS service currently supported by the terminal device (the service data of the MBS service being received or expected to be received) may be used as the highest priority for cell reselection. In the embodiment of the present application, expected reception may also be referred to as interested reception or desired reception.

[0111] The following is a brief description of MBS services and MBS scenarios.

[0112] MBS is a data distribution method or transmission method (multicast or broadcast). MBS services are a general term for services implemented based on this data distribution method or transmission method. In the MBS scenario, network equipment can send MBS service-related sessions (or MBS sessions) to UEs via multicast or broadcast. MBS services support the point-to-multipoint (PTM) mechanism and do not support hybrid automatic repeat request (HARQ). In order to receive MBS service data, the UE can obtain the parameters required to receive the MBS control channel (MCCH) through system messages, and obtain the MBS configuration information of the MBS session (for example, the parameters required to receive service data on the MBS traffic channel (MTCH)) by receiving the parameters required by the MCCH. The UE receives the MBS service data based on the MBS configuration information. For example, the UE receives MBS service data on the aforementioned MTCH based on the MBS configuration information.

[0113] In the embodiment of the present application, "supporting MBS services" means that the terminal device can support the network device to send MBS service data through multicast or broadcast.

[0114] In some embodiments, if the UE detects that the network equipment to which a certain cell (eg, a neighboring cell) belongs does not support a certain MBS service, the UE may ensure the continuity of the MBS service by requesting a unicast data distribution mode or transmission mode before performing cell reselection.

[0115] S702: When RRC connection establishment fails or RRC connection recovery fails, the terminal device generates second information, the second information being related to the MBS service. Further, the terminal device may generate a connection establishment failure (CEF) report, the CEF report including the second information, or the CEF report being the second information.

[0116] In one possible design, whether in case one or case two, the second information may include at least one of the following: second indication information, the second indication information is used to indicate whether the terminal device will take the frequency supporting MBS service as the highest priority during the cell reselection process; service identification information corresponding to the service data of at least one MBS service being received; service identification information corresponding to the service data of at least one MBS service expected to be received; indication information of whether the first cell supports MBS service; or service identification information of at least one MBS service supported by the first cell.

[0117] It should be understood that in case one (the first cell is the cell to which the terminal device reselects during the cell reselection process, and the first cell supports the MBS service), the second information may be at least one of the aforementioned items.

[0118] Optionally, in situation two (the cell to which the terminal device reselects during the cell reselection process is the second cell, and the second cell does not support MBS services), the second information, in addition to at least one of the aforementioned items, may also include at least one of the following items: indication information on whether the second cell supports MBS services; service identification information of at least one MBS service supported by the second cell; or, third indication information, the third indication information is used to indicate that the second cell does not support MBS services, and the purpose of entering the RRC connection state in the first cell is to enable the network device to which the first cell belongs to send MBS service data to the terminal device via unicast.

[0119] In one possible design, in situation two, when the RRC connection is established successfully or the RRC connection is restored successfully, the terminal device can also send an MBS unicast reception request to the network device to which the first cell belongs. The MBS unicast reception request is used to request the network device to send MBS service data to the terminal device via unicast.

[0120] With this design, in a scenario where the second cell does not support MBS services, after the terminal device accesses the network device to which the first cell belongs, it can initiate an MBS unicast reception request to the network device to instruct the terminal device to send MBS service data to the terminal device via unicast, so that the network device to which the first cell belongs can send MBS service data to the terminal device via unicast, thereby ensuring the integrity of the MBS service. Furthermore, after the network device to which the first cell belongs receives the MBS unicast reception request, all network devices subsequently accessed by the terminal device (except the network device to which the first cell belongs) can send MBS service data to the terminal device via unicast. For example, after the terminal device moves from the first cell to the second cell and accesses the network device to which the second cell belongs, even if the second cell does not support MBS services, the network device to which the second cell belongs can send MBS service data to the terminal device via unicast.

[0121] By using the method shown in S701 and S702 above, the terminal device can record the second information related to the MBS service, so that the second information can be used to optimize the frequency coverage of the MBS service, or to optimize the cell's support for the MBS service, thereby improving the user experience of the MBS service.

[0122] In a possible design, after executing S702, the terminal device may execute the cell reselection process again to access the network device. Based on the above design, S703 and S704 may also be included.

[0123] S703: The terminal device may send the second information to the network device; correspondingly, the network device may receive the second information from the terminal device. For example, the terminal device may send a CEF report to the network device, the CEF report including the second information, or the CEF report being the second information.

[0124] S704: The network device optimizes the frequency coverage of the MBS service and / or optimizes the support of the first cell for the MBS service according to the aforementioned second information.

[0125] For example, network equipment can send MBS service data via multicast or broadcast on frequencies with good downlink coverage, providing terminal devices with a better MBS service experience. Another example is that the terminal device's home cell and neighboring cells within a preset area both send the MBS service data that the terminal device is expected to receive. As the terminal device moves within the preset area, it can always receive the aforementioned MBS data, ensuring the continuity of the MBS service.

[0126] The methods shown in S701 to S704 above may be executed individually, or they may be executed in combination with S401 to S403 above, which is not limited in this application.

[0127] By using the method shown in S701 to S704 above, the terminal device can record the second information related to the MBS service, the network device can obtain the second information, and optimize the frequency coverage of the MBS service based on the second information, optimize the cell's support for the MBS service, and improve the user experience of the MBS service.

[0128] It should be understood that the network devices in S701 (and S702) and the network devices in S703 (and S704) may be the same or different. FIG7 only illustrates the example of the same network devices, but does not serve as a limitation to the present application.

[0129] The method provided in the embodiment of the present application is introduced above in conjunction with the accompanying drawings. The communication device provided in the embodiment of the present application is introduced below in conjunction with the accompanying drawings.

[0130] Based on the same technical concept, this application also provides a communication device for implementing the communication methods provided in the above embodiments. Referring to Figure 8 , communication device 800 includes a communication unit 801 and a processing unit 802. Communication unit 801 is configured to receive and transmit data; processing unit 802 is configured to implement the steps of the communication methods shown in Figures 4, 6, or 7. Processing unit 802 can also control the operations performed by communication unit 801.

[0131] In a possible example, when the communication device 800 is used to implement the functions of the terminal device in the embodiment shown in Figure 4 or Figure 6 above, the processing unit 802 is used to determine that the cell reselection is abnormal when the cell reselected during the cell reselection process is the resident cell at the current moment; the communication unit 801 is used to send first information to the network device, and the first information is used to indicate a cell reselection abnormality.

[0132] In one possible design, the first information may include at least one of the following: path information of the communication device 800; speed information of the communication device 800; location information of the communication device 800; indication information of whether the communication device 800 is in a low-speed mobile state, where the communication device 800 is in a low-speed mobile state when: within a first time period, a change in a signal quality measurement result of a resident cell is less than or equal to a first threshold; indication information of whether the communication device 800 is in a cell center position when: a signal quality measurement result of a resident cell is greater than or equal to a second threshold; indication information of whether to start relaxation measurement; and indication information of whether to start cell measurement during cell reselection. the moment of measuring the signal quality of the resident cell; the moment of reselecting to the resident cell during the cell reselection process; the moment of sending the first information; the time difference between the moment of starting the cell measurement and the moment of reselecting to the resident cell; the time difference between the moment of starting the cell measurement and the moment of sending the first information; the time difference between the moment of reselecting to the resident cell and the moment of sending the first information; the identification information of the resident cell; the signal quality measurement result of the resident cell; the R criterion calculation result of the resident cell; the S criterion calculation result of the resident cell; the identification information of at least one cell other than the resident cell; the signal quality measurement result of at least one cell; the R criterion calculation result of at least one cell; or, the S criterion calculation result of at least one cell.

[0133] In one possible design, the processing unit 802 is further used to: receive first indication information from the network device before sending the first information to the network device; the first indication information is used to indicate that the first information should be recorded when a cell reselection abnormality is detected.

[0134] In one possible design, the processing unit 802 is specifically used to: determine that the cell reselection is abnormal when the reselected cell is a resident cell and meets at least one of the following conditions: within a first time period, the change in the signal quality measurement result of the resident cell is less than or equal to a first threshold; or, the signal quality measurement result of the resident cell is greater than or equal to a second threshold.

[0135] In another possible example, when the communication device 800 is used to implement the functions of the network device in the embodiment shown in Figure 4 or Figure 6 above, the communication unit 801 is used to receive first information from the terminal device; the first information is used to indicate a cell reselection abnormality; the processing unit 802 is also used to: adjust the cell reselection parameters according to the first information.

[0136] In one possible design, the aforementioned cell reselection parameters include a start threshold for cell measurement.

[0137] In one possible design, the first information includes at least one of the following: path information of the terminal device; speed information of the terminal device; location information of the terminal device; indication information of whether the terminal device is in a low-speed mobile state, where the terminal device is in a low-speed mobile state when: within a first time period, the change in the signal quality measurement result of the resident cell is less than or equal to a first threshold; indication information of whether the terminal device is in the center of the cell, where the terminal device is in the center of the cell when: the signal quality measurement result of the resident cell is greater than or equal to a second threshold; indication information of whether the terminal device starts relaxation measurement; the moment when the terminal device starts cell measurement during cell reselection; during cell reselection The moment when the terminal device reselects to the resident cell; the moment when the terminal device sends the first information; the time difference between the moment when the cell measurement is started and the moment when the resident cell is reselected; the time difference between the moment when the cell measurement is started and the moment when the first information is sent; the time difference between the moment when the resident cell is reselected and the moment when the first information is sent; the identification information of the resident cell; the signal quality measurement result of the resident cell; the R criterion calculation result of the resident cell; the S criterion calculation result of the resident cell; the identification information of at least one cell other than the resident cell; the signal quality measurement result of at least one cell; the R criterion calculation result of at least one cell; or, the S criterion calculation result of at least one cell.

[0138] In one possible design, the communication unit 801 is further used to: send first indication information to the terminal device, and the first indication information is used to instruct the terminal device to record the first information when detecting a cell reselection abnormality.

[0139] In another possible example, when the communication device 800 is used to implement the functions of the terminal device in the embodiment shown in Figure 7 above, the processing unit 802 is used to generate second information when radio resource control RRC connection establishment or RRC connection recovery is initiated in the first cell and the RRC connection establishment fails or the RRC connection recovery fails, and the second information is related to the multicast broadcast service MBS service.

[0140] In one possible design, when the first cell is the cell to which the terminal device reselects during the cell reselection process, and the first cell supports MBS services; the second information includes at least one of the following: second indication information, the second indication information is used to indicate whether the terminal device will regard the frequency supporting the MBS service as the highest priority during the cell reselection process; service identification information corresponding to service data of at least one MBS service being received; service identification information corresponding to service data of at least one MBS service expected to be received; indication information of whether the first cell supports MBS services; or, service identification information of at least one MBS service supported by the first cell.

[0141] In one possible design, the cell to which the terminal device reselects during the cell reselection process is the second cell, and the second cell does not support MBS services; the second information includes at least one of the following: second indication information, the second indication information is used to indicate whether the terminal device will take the frequency supporting MBS services as the highest priority during the cell reselection process; service identification information corresponding to service data of at least one MBS service being received; service identification information corresponding to service data of at least one MBS service expected to be received; indication information of whether the first cell supports MBS services; service identification information of at least one MBS service supported by the first cell; indication information of whether the second cell supports MBS services; service identification information of at least one MBS service supported by the second cell; or, third indication information, the third indication information is used to indicate that the second cell does not support MBS services, and the purpose of entering the RRC connection state in the first cell is to enable the network device to which the first cell belongs to send MBS service data to the terminal device in a unicast manner.

[0142] Based on the same technical concept, an embodiment of the present application also provides another communication device 900, which can implement the communication method provided in the above embodiment. Referring to Figure 9, the communication device 900 includes a processor 901. Optionally, the communication device 900 also includes a memory 902 and a communication interface 903. The memory can be placed inside the communication device or outside the communication device, which is not limited in this application. Among them, the communication interface 903, the processor 901, and the memory 902 are interconnected.

[0143] Optionally, the communication interface 903, the processor 901, and the memory 902 are interconnected via a bus 904. The bus 904 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be classified as an address bus, a data bus, a control bus, and the like. For ease of illustration, FIG9 shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0144] The communication interface 903 is used to receive and send signals to implement communication with other devices other than the communication device.

[0145] The functions of the processor 901 can be described in the above embodiments and will not be repeated here. The processor 901 can be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP, etc. The processor 901 can further include a hardware chip. The above-mentioned hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof. When implementing the above-mentioned functions, the processor 901 can be implemented through hardware, or of course, the corresponding software implementation can be executed by hardware.

[0146] The memory 902 is used to store program instructions, etc. Specifically, the program instructions may include program code, which includes computer operation instructions. The memory 902 may include random access memory (RAM), and may also include non-volatile memory (non-volatile memory), such as at least one disk storage. The processor 901 executes the program instructions stored in the memory 902 to implement the above functions, thereby implementing the method provided in the above embodiment. Exemplarily, the memory 902 may include the network device or terminal device shown in the embodiment of the present application.

[0147] Based on the same technical concept, an embodiment of the present application further provides a computer program, which, when executed on a computer, enables the computer to execute the method provided in the above embodiment.

[0148] Based on the same technical concept, an embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a computer, the computer executes the method provided in the above embodiment.

[0149] The storage medium may be any available medium that can be accessed by a computer. By way of example and not limitation, computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer.

[0150] Based on the same technical concept, an embodiment of the present application further provides a chip, which is used to read a computer program stored in a memory to implement the method provided in the above embodiment.

[0151] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0152] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each flow and / or box in the flow chart and / or block diagram, as well as the combination of the flow chart and / or box in the flow chart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more flow charts and / or one or more boxes in the block diagram.

[0153] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0154] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0155] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A communication method, applied to a terminal device, characterized in that, The method includes: When the reselected cell during the cell reselection process is the serving cell at the current moment, determining that the cell reselection is abnormal; Sending first information to a network device, where the first information is used to indicate that the cell reselection is abnormal.

2. The method according to claim 1, characterized in that, The first information includes at least one of the following: The path information of the terminal device; The speed information of the terminal device; The location information of the terminal device; An indication information indicating whether the terminal device is in a low-speed moving state, where the terminal device is in the low-speed moving state when: within a first time period, the change amount of the signal quality measurement result of the serving cell is less than or equal to a first threshold; An indication information indicating whether the terminal device is at the cell center position, where the terminal device is at the cell center position when: the signal quality measurement result of the serving cell is greater than or equal to a second threshold; An indication information indicating whether to start relaxed measurement; The moment when cell measurement is started during the cell reselection process; The moment when the serving cell is reselected to during the cell reselection process; The moment when the first information is sent; The time difference between the moment when cell measurement is started and the moment when the serving cell is reselected to; The time difference between the moment when cell measurement is started and the moment when the first information is sent; The time difference between the moment when the serving cell is reselected to and the moment when the first information is sent; The identification information of the serving cell; The signal quality measurement result of the serving cell; The R-criterion calculation result of the serving cell; The S-criterion calculation result of the serving cell; The identification information of at least one cell other than the serving cell; The signal quality measurement results of the at least one cell; The R-criterion calculation result of the at least one cell; or The S-criterion calculation result of the at least one cell.

3. The method according to claim 1 or 2, characterized in that, Before sending the first information to the network device, the method further includes: Receiving first indication information from the network device; the first indication information is used to indicate that when cell reselection abnormality is detected, record the first information.

4. The method according to any one of claims 1-3, characterized in that, When the reselected cell during the cell reselection process is the serving cell, determining that the cell reselection is abnormal includes: When the reselected cell is the serving cell and satisfies at least one of the following conditions, determining that the cell reselection is abnormal: Within a first time period, the change amount of the signal quality measurement result of the serving cell is less than or equal to a first threshold; or The signal quality measurement result of the serving cell is greater than or equal to a second threshold.

5. A communication method, characterized in that, Applied to a network device, characterized in that the method includes: Receiving first information from a terminal device; the first information is used to indicate that the cell reselection is abnormal; Adjusting cell reselection parameters according to the first information.

6. The method according to claim 5, characterized in that The cell reselection parameter includes a start threshold for cell measurement.

7. The method according to claim 5 or 6, characterized in that, The first information includes at least one of the following: The path information of the terminal device; The speed information of the terminal device; The location information of the terminal device; Indication information on whether the terminal device is in a low-speed moving state, where the terminal device being in the low-speed moving state means that within a first time period, the change amount of the signal quality measurement result of the serving cell is less than or equal to a first threshold; Indication information on whether the terminal device is at the cell center position, where the terminal device being at the cell center position means that the signal quality measurement result of the serving cell is greater than or equal to a second threshold; Indication information on whether the terminal device starts relaxed measurement; The moment when the terminal device starts cell measurement during the cell reselection process; The moment when the terminal device reselects to the serving cell during the cell reselection process; The moment when the terminal device sends the first information; The time difference between the moment of starting cell measurement and the moment of reselecting to the serving cell; The time difference between the moment of starting cell measurement and the moment of sending the first information; The time difference between the moment of reselecting to the serving cell and the moment of sending the first information; The identification information of the serving cell; The signal quality measurement result of the serving cell; The calculation result of the R criterion of the serving cell; The calculation result of the S criterion of the serving cell; The identification information of at least one cell other than the serving cell; The signal quality measurement results of the at least one cell; The calculation result of the R criterion of the at least one cell; or The calculation result of the S criterion of the at least one cell.

8. The method according to any one of claims 5-7, characterized in that, The method further includes: Sending first indication information to the terminal device, where the first indication information is used to indicate that when the terminal device detects an abnormal cell reselection, it records the first information.

9. A communication method, applied to a terminal device, characterized in that, The method includes: When a radio resource control (RRC) connection establishment or RRC connection recovery is initiated in a first cell, and the RRC connection establishment fails or the RRC connection recovery fails, generating second information, where the second information is related to a multicast broadcast service (MBS) service.

10. The method according to claim 9, characterized in that, The first cell is the cell reselected by the terminal device during the cell reselection process, and the first cell supports the MBS service; the second information includes at least one of the following: Second indication information, which is used to indicate whether the terminal device takes the frequency band supporting the MBS service as the highest priority during the cell reselection process; Service identification information corresponding to the service data of at least one MBS service being received; Service identification information corresponding to the service data of at least one MBS service expected to be received; Indication information on whether the first cell supports the MBS service; or Service identification information of at least one MBS service supported by the first cell.

11. The method according to claim 9, wherein The cell reselected by the terminal device during the cell reselection process is a second cell, and the second cell does not support the MBS service; the second information includes at least one of the following: Second indication information, which is used to indicate whether the terminal device takes the frequency band supporting the MBS service as the highest priority during the cell reselection process; Service identification information corresponding to the service data of at least one MBS service being received; Service identification information corresponding to service data of at least one MBS service expected to be received Indication information on whether the first cell supports the MBS service Service identification information of at least one MBS service supported by the first cell Indication information on whether the second cell supports the MBS service Service identification information of at least one MBS service supported by the second cell; or Third indication information, where the third indication information is used to indicate that the second cell does not support the MBS service, and the purpose of the first cell entering the RRC connected state is to enable the network device to which the first cell belongs to send MBS service data to the terminal device in a unicast manner 12. A communication device, characterized in that, Comprising: A communication unit and a processing unit The communication unit is used to receive and send data The processing unit is used to execute the method according to any one of claims 1-4 13. A communication device, characterized in that, Comprising: A communication unit and a processing unit The communication unit is used to receive and send data The processing unit is used to execute the method according to any one of claims 5-8 14. A communication device, characterized in that, Comprising: A communication unit and a processing unit The communication unit is used to receive and send data The processing unit is used to execute the method according to any one of claims 9-11 15. A communication device, characterized in that, Comprising: At least one processor The at least one processor is used to execute the method according to any one of claims 1-4 16. A communication device, characterized in that, Comprising: At least one processor The at least one processor is used to execute the method according to any one of claims 5-8 17. A communication device, characterized in that, Comprising: At least one processor The at least one processor is used to execute the method according to any one of claims 9-11 18. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are called by a computer, the computer is made to execute the method according to any one of claims 1-4, or execute the method according to any one of claims 5-8, or execute the method according to any one of claims 9-11 19. A chip system, characterized in that, Comprising a processor: The processor is used to execute a computer-executable program, so that the device installed with the chip system executes the method according to any one of claims 1-4, or execute the method according to any one of claims 5-8, or execute the method according to any one of claims 9-11 20. A communication system, characterized in that, Comprising a terminal device and a network device The terminal device is used to execute the method according to any one of claims 1-4; the network device is used to execute the method according to any one of claims 5-8 21. A computer program product, characterized in that, The computer program product stores a computer program or instruction, and when the computer program or instruction is executed by a communication device, the computer is made to execute the method according to any one of claims 1-11

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