Communication method and apparatus

Abstract

The present application relates to a communication method and apparatus. The method comprises: a first apparatus receiving an RRC release message from a first cell, wherein the RRC release message is used for releasing the first apparatus to an RRC non-connected state to receive a multicast service, and the RRC release message further indicates a first frequency; the first apparatus entering the RRC non-connected state on the basis of the RRC release message; and if a first candidate cell at the first frequency is included within an effective range corresponding to the first frequency, the first apparatus camping on the first candidate cell. In the embodiments of the present application, an effective range of a frequency is set, for example, a cell within the effective range may provide a multicast service in an RRC non-connected state; and if a first candidate cell is included within the effective range, indicating that the first candidate cell may provide the multicast service in the RRC non-connected state, a first apparatus may camp on the first candidate cell, thereby improving the probability of a first apparatus successfully receiving the multicast service in the RRC non-connected state in a cell on which the first apparatus newly camps.

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 October 31, 2023, with application number 202311439049.2 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 communication technology, and in particular to a communication method and device. Background Art

[0004] Multicast and broadcast service (MBS) is a service for multiple user equipment (UE), such as live broadcast service, public safety service, batch software update service, etc. In the new radio (NR) system, MBS includes broadcast service and multicast service, among which multicast service is also called multicast service. UE can receive multicast service in the radio resource control (RRC) connected state. However, when the number of users receiving multicast service in a cell is too large, it may exceed the number of RRC connected users that the cell can accommodate, which may cause congestion and other phenomena. In order to alleviate network congestion, it is currently proposed to support UEs joining multicast sessions to receive multicast services in the RRC inactive state. For example, a cell releases the UE to the RRC inactive state through an RRC release message. The RRC release message can indicate the cell reselection priority, which is a dedicated priority for cell reselection. The UE may then perform cell reselection based on the cell reselection priority to receive the multicast service in the RRC non-connected state.

[0005] However, there may be problems with this approach. For example, the UE's cell 1 at frequency 1 is released to the RRC non-connected state, and the RRC release message sent by cell 1 to the UE indicates frequency 2 for receiving multicast services in the RRC non-connected state. The UE can then reselect to cell 2 at frequency 2 to receive multicast services in cell 2. Although cell 2 is a cell at frequency 2, it may not provide multicast services in the RRC non-activated state. That is, other cells except cell 2 at frequency 2 may provide multicast services in the RRC non-activated state, but cell 2 does not. It can be seen that the UE may reselect an inappropriate cell through the current mechanism, resulting in the UE being unable to receive multicast services in the RRC non-connected state.

[0006] Summary of the Invention

[0007] Embodiments of the present application provide a communication method and apparatus for increasing the probability of a UE successfully receiving a multicast service in an RRC non-connected state.

[0008] In a first aspect, a communication method is provided, which can be performed by a first device. The first device is, for example, a terminal device, or other device including the functions of a terminal device, or a chip system (or, chip) or other functional module, which can realize the functions of the first device, and the chip system or functional module is, for example, set in the terminal device. The method includes: receiving an RRC release message from a first cell, the RRC release message is used to release the first device to an RRC non-connected state to receive multicast services, and the RRC release message is also used to indicate a first frequency; entering the RRC non-connected state based on the RRC release message; if the first candidate cell under the first frequency is included in the effective range corresponding to the first frequency, residing in the first candidate cell.

[0009] The embodiment of the present application sets an effective range of frequency. For example, a cell within the effective range may provide multicast services in the RRC non-connected state. Then, the RRC release message indicates the first frequency. When the first device performs a cell reselection or cell selection process, if the first candidate cell is selected, it does not directly reside in the first candidate cell, but determines whether the first candidate cell is included in the effective range corresponding to the first frequency. For example, if it is included in the effective range, it indicates that the first candidate cell may provide multicast services in the RRC non-connected state. The first device can reside in the first candidate cell, thereby increasing the probability of the first device successfully receiving the multicast service in the RRC non-connected state in the newly resided cell. Optionally, if the first candidate cell is not included in the effective range, the first device may not reside in the first candidate cell. For example, the first device can continue to select other candidate cells to receive multicast services in the RRC non-connected state as much as possible, rather than entering the RRC connected state in the first candidate cell to receive multicast data, thereby reducing the situation of entering the RRC connected state and alleviating the congestion level of the cell.

[0010] In an optional embodiment, the method further includes: receiving a first multicast service in the first candidate cell in the RRC non-connected state. If the first candidate cell is included in the effective range corresponding to the first frequency, the first candidate cell is a cell that is highly likely to provide the multicast service in the RRC non-connected state. If the first device resides in the first candidate cell, it can receive the multicast service in the first candidate cell in the RRC non-connected state, thereby eliminating the need for the first device to enter the RRC connected state, reducing power consumption caused by entering the RRC connected state, and also reducing cell congestion.

[0011] In an optional embodiment, the RRC release message is further used to indicate the priority of the first frequency, and the priority of the first frequency is used by the first device to reselect a cell for receiving a multicast service in the RRC non-connected state. When the first device performs cell reselection, the priority of the first frequency can be used. For example, the first device can set the priority of the first frequency to the highest priority during the reselection process, so that the first device can preferentially select a cell under the first frequency to increase the probability of the first device receiving the multicast service.

[0012] In an optional embodiment, the effective range is used to indicate the cell or area that provides the multicast service in the RRC non-connected state at the first frequency. For example, the effective range of the first frequency (or the effective range of a certain frequency A in the first frequency) may include (or indicate) one or more of the following: information (such as cell identifiers) of some or all cells under the first frequency (or frequency A), one or more radio access network area codes (RNA) corresponding to the first frequency (or frequency A), or one or more tracking area codes (tracking area codes) corresponding to the first frequency (or frequency A). Alternatively, the effective range can also indicate the cell or area that provides the multicast service in the RRC non-connected state at the first frequency through other information, and there is no limitation on this.

[0013] In an optional embodiment, the RRC release message is further used to indicate the effective range. The effective range of the first frequency can be indicated by the RRC release message, or can also be indicated by other messages from the network device, or can also be predefined by a protocol, or preconfigured in the first device.

[0014] In an optional embodiment, the method further includes: setting the first frequency as the highest priority frequency. For example, during cell reselection, the first device may set the first frequency as the highest priority frequency, or set the priority of the first frequency to the highest priority. In this way, the first device can preferentially select a candidate cell under the first frequency, thereby increasing the probability of the first device receiving the multicast service.

[0015] In an optional embodiment, if the first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, before residing in the first candidate cell, the method further includes: measuring the first candidate cell; and determining, based on the measurement results, that the first candidate cell meets the cell reselection conditions. The first device can first determine that the first candidate cell meets the cell reselection conditions, indicating that the first candidate cell can be resided in, and then the first device can determine whether the first candidate cell is within the effective range of the first frequency, which is compatible with traditional cell reselection processes.

[0016] In an optional embodiment, before residing on the first candidate cell if the first candidate cell at the first frequency is within the effective range corresponding to the first frequency, the method further includes: measuring the first candidate cell. If the first candidate cell at the first frequency is within the effective range corresponding to the first frequency, residing on the first candidate cell includes: if the first candidate cell at the first frequency is within the effective range corresponding to the first frequency, determining whether the first candidate cell meets a cell reselection condition based on the measurement result; and if the first candidate cell meets the cell reselection condition, residing on the first candidate cell. In this manner, the first device can first determine whether the first candidate cell is within the effective range corresponding to the first frequency. If the first candidate cell is within the effective range corresponding to the first frequency, the first device can further determine whether the first candidate cell meets the cell reselection condition. If the first candidate cell is not within the effective range corresponding to the first frequency, the first device does not need to determine whether the first candidate cell meets the cell reselection condition. For example, the first device can proceed to determine the next candidate cell. This approach can reduce the first device's candidate cell identification process, save power consumption of the first device, and improve cell reselection efficiency.

[0017] In an optional embodiment, if the first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, residing in the first candidate cell includes: if the first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, measuring the first candidate cell; if it is determined according to the measurement result that the first candidate cell meets the cell reselection condition, residing in the first candidate cell. In this way, the first device can first determine whether the first candidate cell is included in the effective range corresponding to the first frequency. If the first candidate cell is included in the effective range corresponding to the first frequency, the first device can further perform measurement and other processing on the first candidate cell. If the first candidate cell is not included in the effective range corresponding to the first frequency, the first device does not need to measure the first candidate cell. For example, the first device can continue to determine the next candidate cell. In this way, the first device's determination process for the candidate cell can be reduced to a greater extent, the power consumption of the first device can be saved, and the efficiency of cell reselection can be improved.

[0018] In an optional embodiment, the method further includes: if the first candidate cell at the first frequency is not included in the effective range corresponding to the first frequency, not residing in the first candidate cell. If the first candidate cell is not included in the effective range, the first device may not reside in the first candidate cell. For example, the first device may continue to select other candidate cells to receive multicast services in the RRC non-connected state as much as possible, rather than entering the RRC connected state in the first candidate cell to receive multicast data, thereby reducing the number of times the RRC connected state is entered and alleviating cell congestion.

[0019] In an optional embodiment, the method further includes: if the number of candidate cell selections is greater than or equal to a first threshold, residing in the last selected candidate cell. During a cell reselection process, if no eligible cell is selected, the first device may enter an infinite loop, that is, it is always in the cell reselection state and may not be able to communicate normally. In order to reduce the probability of the first device entering an infinite loop, the embodiment of the present application can set a first threshold so that the first device can exit the cell reselection process in time to communicate.

[0020] In a second aspect, another communication method is provided, which can be performed by a first device. The first device is, for example, a terminal device, or other device including the functions of a terminal device, or a chip system (or, chip) or other functional module, which can realize the functions of the first device, and the chip system or functional module is, for example, set in the terminal device. The method includes: determining that the first candidate cell does not provide multicast services in the RRC non-connected state; receiving a second message from the first candidate cell, the second message is used to indicate a second frequency; if the second frequency includes the frequency of the first candidate cell, entering the RRC connected state in the first candidate cell.

[0021] In the embodiment of the present application, although the first candidate cell does not currently provide multicast services in the RRC non-connected state, it can be known through the judgment process of the first device that the first candidate cell is likely to provide multicast services in the RRC connected state. Therefore, the first device can reside in the first candidate cell and enter the RRC connected state in the first candidate cell, so that after entering the RRC connected state, it can have a greater probability of receiving multicast services, thereby improving the success rate of the first device receiving multicast services. If the first device does not make any judgment after determining that the first candidate cell does not currently provide multicast services in the RRC non-connected state, but directly enters the RRC connected state, then if the frequency of the first candidate cell is not included in the frequencies that may provide multicast services, even if the first device enters the RRC connected state, it may not be able to receive multicast services. It can be seen that the method provided by the embodiment of the present application can improve the probability of the first device receiving multicast services.

[0022] In an optional embodiment, the second message is further used to indicate the priority of the second frequency, and the priority of the second frequency is used by the first device to perform cell reselection for receiving multicast services in the RRC non-connected state. When the first device performs cell reselection, the priority of the first frequency can be used. For example, the first device can set the priority of the first frequency to the highest priority during the reselection process, so that the first device can preferentially select the cell under the first frequency, thereby increasing the probability of the first device receiving the multicast service.

[0023] In an optional embodiment, the method further includes: if the second frequency does not include the frequency corresponding to the first candidate cell, not residing in the first candidate cell. If the frequency of the first candidate cell is not included in the second frequency, then even if the first device enters the RRC connected state, it may not be able to receive the multicast service. Therefore, the first device may not reside in the first candidate cell. For example, the first device may continue to identify the next candidate cell. Through the method provided in the embodiment of the present application, the probability of the first device receiving the multicast service can be increased.

[0024] In an optional embodiment, if the second frequency includes the frequency of the first candidate cell, entering the RRC connected state in the first candidate cell includes: if the first frequency and the second frequency intersect, and the intersection includes the frequency of the first candidate cell, entering the RRC connected state in the first candidate cell, the first frequency being the frequency indicated by the first message received in the source cell. The first frequency is a frequency determined by the first cell or the second cell to be capable of providing multicast services in the RRC non-connected state. The multicast services provided by the cell at the first frequency are likely to be of interest to the first device or to be of particular importance to the first device. If the first frequency and the second frequency intersect, the services provided by the cell at the frequency corresponding to the intersection are likely to be of interest to the first device or to be of particular importance to the first device. If the intersection includes the frequency of the first candidate cell, this indicates that the first candidate cell may provide these multicast services. In this case, although the first candidate cell does not currently provide multicast services in the RRC non-connected state, it may provide multicast services in the RRC connected state. Therefore, the first device can reside in the first candidate cell and enter the RRC connection state in the first candidate cell, so that after entering the RRC connection state, it can receive multicast services with a greater probability, thereby improving the success rate of UE receiving multicast services, and also making the first device have a greater chance of obtaining multicast services that the first device is interested in or are more important to the first device.

[0025] In an optional embodiment, the method further includes: if the number of times a candidate cell is selected is greater than or equal to a first threshold, entering an RRC connection state in the last selected candidate cell. During a cell reselection process, if a qualified cell is never selected, the first device may enter an infinite loop, that is, it is always in a cell reselection state and may not be able to communicate normally. In order to reduce the probability of the first device entering an infinite loop, the embodiment of the present application can set a first threshold so that the first device can exit the cell reselection process in time to communicate.

[0026] In an optional implementation, the first message is an RRC release message or an MCCH message, and the second message is an MCCH message; or, the first message is an RRC release message or a system message, and the second message is a system message. In addition, the first message and / or the second message may be implemented in other ways, which are not specifically limited.

[0027] In a third aspect, a communication device is provided. The communication device may be the first device described in any one of the first to second aspects. The communication device possesses the functions of the first device. The first device may be, for example, a terminal device, or other device including terminal device functions, or a system-on-chip (or chip) or other functional module. The system-on-chip or functional module may implement the functions of the first device, and the system-on-chip or functional module may be, for example, disposed in the terminal device. In one optional implementation, the communication device includes a baseband device and a radio frequency device. In another optional implementation, the communication device includes a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit may implement both transmitting and receiving functions. When the transceiver unit implements the transmitting function, it may be referred to as a transmitting unit (sometimes also referred to as a transmitting module). When the transceiver unit implements the receiving function, it may be referred to as a receiving unit (sometimes also referred to as a receiving module). The transmitting unit and the receiving unit may be the same functional module, referred to as a transceiver unit, which implements both transmitting and receiving functions. Alternatively, the transmitting unit and the receiving unit may be different functional modules, with the transceiver unit being a collective term for these functional modules.

[0028] In an optional embodiment, the transceiver unit (or, the receiving unit) is used to receive an RRC release message from the first cell, the RRC release message is used to release the first device to the RRC non-connected state to receive multicast services, and the RRC release message is also used to indicate the first frequency; the processing unit is used to enter the RRC non-connected state based on the RRC release message; the processing unit is also used to reside in the first candidate cell if the first candidate cell under the first frequency is included in the effective range corresponding to the first frequency.

[0029] In an optional embodiment, the processing unit is used to determine that the first candidate cell does not provide multicast services in the RRC non-connected state; the transceiver unit (or, the receiving unit) is used to receive a second message from the first candidate cell, and the second message is used to indicate a second frequency; the processing unit is also used to enter the RRC connected state in the first candidate cell if the second frequency includes the frequency of the first candidate cell.

[0030] In an optional embodiment, the communication device also includes a storage unit (sometimes also referred to as a storage module), and the processing unit is used to couple with the storage unit and execute the program or instructions in the storage unit, enabling the communication device to perform the function of the first device described in any one of the first to second aspects above.

[0031] In a fourth aspect, a communication device is provided. The communication device may be a terminal device, or a chip or chip system used in a terminal device. The communication device includes a communication interface and a processor, and optionally, a memory. The memory is used to store a computer program. The processor is coupled to the memory and the communication interface. When the processor reads the computer program or instructions, the communication device executes the method performed by the first device in each of the above aspects.

[0032] In a fifth aspect, a communication system is provided, comprising a first device, wherein the first device is configured to execute the method described in the first or second aspect. For example, the first device may be implemented by the communication device described in the third or fourth aspect. Optionally, the communication system may further include other devices or equipment, such as network equipment and / or other devices other than the first device (e.g., other terminal devices), without limitation.

[0033] In a sixth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store computer programs or instructions, which, when executed, enables the method performed by the first device in the above aspects to be implemented.

[0034] In a seventh aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the methods described in the above aspects to be implemented.

[0035] In an eighth aspect, a chip system is provided, comprising a processor and an interface, wherein the processor is configured to call and execute instructions from the interface so that the chip system implements the methods of the above aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic diagram of a UE reselecting to another cell to receive a multicast service after being released;

[0037] FIG2 is a schematic diagram of a network architecture used in an embodiment of the present application;

[0038] FIG3 is a flow chart of a communication method provided in an embodiment of the present application;

[0039] 4A and 4B are flowcharts of two cell reselection processes under the first cell reselection method provided in an embodiment of the present application;

[0040] 5A and 5B are flowcharts of two cell reselection processes under the second cell reselection method provided in an embodiment of the present application;

[0041] 6A and 6B are flowcharts of two cell reselection processes under the third cell reselection method provided in an embodiment of the present application;

[0042] FIG7 is a flow chart of another communication method provided in an embodiment of the present application;

[0043] FIG8 is a schematic diagram of a device provided in an embodiment of the present application;

[0044] FIG9 is a schematic diagram of another device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0046] In the embodiments of the present application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more". "At least one" means one or more, and "plural" means two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. For example, A / B means: A or B. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0047] In the embodiments of this application, ordinal numbers such as "first" and "second" are used to distinguish multiple objects and are not used to limit the size, content, order, timing, priority, or importance of multiple objects. In addition, the numbering of steps in the various embodiments introduced in this application is only to distinguish different steps and is not used to define the order between steps. For example, S301 can occur before S302, or after S302, or at the same time as S302.

[0048] Below, some terms or concepts in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

[0049] In the embodiment of the present application, the terminal device is a device with wireless transceiver function, which can be a fixed device, a mobile device, a handheld device (such as a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device built into the above device (such as a communication module, a modem, or a chip system, etc.). The terminal device is used to connect people, objects, machines, etc., and can be widely used in various scenarios, such as but not limited to the following scenarios: perception scenarios, cellular communications, device-to-device communication (D2D), vehicle to everything (V2X), machine-to-machine / machine-type communications (M2M / MTC), Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, drones, robots, indoor commercial scenarios (such as mobile phone screen projection, file sharing, mobile phone to VR glasses video transmission) and other scenarios. When the terminal device is applied to V2X, it can also be called a V2X device, for example, a smart car (or intelligent car), a digital car, an unmanned car (or driverless car or pilotless car or automobile), a self-driving car (or autonomous car), a pure electric vehicle (or battery EV), a hybrid electric vehicle (HEV), a range-extended EV (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (new energy vehicle), or a roadside unit (RSU). The terminal device can also be a device used in D2D communication, such as an electricity meter or water meter.

[0050] In addition, in the embodiments of the present application, the terminal device can also be a terminal device in an IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0051] The various terminal devices described above, if located on a vehicle (e.g., placed in or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs). The terminal device of the present application can also be an on-board module, on-board module, on-board component, on-board chip, or on-board unit built into a vehicle as one or more components or units, and the vehicle can implement the method of the present application through the built-in on-board module, on-board module, on-board component, on-board chip, or on-board unit.

[0052] The terminal device may sometimes be referred to as UE, terminal, access station, UE station, remote station, wireless communication device, or user equipment, etc.

[0053] In the embodiments of the present application, the communication device for implementing the terminal device function may be a terminal device, or may be a device capable of supporting the terminal device to implement the function, such as a chip system, which may be installed in the terminal device. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by taking the terminal device as an example in which the device for implementing the terminal device function is a terminal device. In addition, for ease of description, the terminal device in the embodiments of the present application is described by taking a UE as an example.

[0054] The network devices in the embodiments of the present application include, for example, access network devices, and / or core network devices. The access network device is a device with wireless transceiver functions, which is used to communicate with the terminal device. The access network devices include but are not limited to base stations (base transceiver station (BTS), node B (Node B), evolved node B (eNodeB) / eNB, or the next generation node B (gNodeB) / gNB), transmission reception points (TRP), base stations subsequently evolved by the third generation partnership project (3GPP), access nodes in wireless fidelity (Wi-Fi) systems, wireless relay nodes, wireless backhaul nodes, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, etc. Multiple base stations can support networks with the same access technology, or they can support networks with different access technologies. The base station can include one or more co-station or non-co-station transmission and receiving points. The access network device may also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The access network device may also be a server, etc. For example, the network device in the V2X technology may be a road side unit (RSU). The following describes the access network device using a base station as an example. The base station can communicate with the terminal device, or it can communicate with the terminal device through a relay station. The terminal device can communicate with multiple base stations in different access technologies. The core network device is used to implement functions such as mobility management, data processing, session management, policy and billing. The names of the devices that implement core network functions in systems with different access technologies may be different, and the embodiments of the present application are not limited to this. Taking the fifth generation mobile communication technology (5G) system as an example, the core network equipment includes: access and mobility management function (AMF), session management function (SMF), policy control function (PCF) or user plane function (UPF), etc.

[0055] In the embodiments of the present application, the communication device for implementing the network device function may be a network device, or may be a device capable of supporting the network device to implement the function, such as a chip system, which may be installed in the network device. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by taking the network device as an example of the device for implementing the network device function being a network device.

[0056] When a UE in the RRC non-connected state resides in a cell, it can measure the signal quality of the cell and neighboring cells to select a better cell to reside in according to the cell reselection rules. The main process of the UE during cell reselection is as follows:

[0057] 1. According to the measurement start standard, measure the current resident cell and neighboring cells (including one or more cells of the same frequency cell, different frequency cell, or different system cell).

[0058] 2. Determine whether the signal quality of the neighboring cell meets the cell reselection conditions.

[0059] 3. If the signal quality of the neighboring cell meets the cell reselection criteria, cell reselection is initiated and a system message from the new cell is received. If the system message confirms that there are no access restrictions, the user can reside in the new cell. If the signal quality of the neighboring cell does not meet the cell reselection criteria, the user can remain in the current cell.

[0060] The neighboring cell measurement process is introduced as follows.

[0061] Neighboring cell measurement considers two parameters: priority (called cell reselection priority) and signal quality of the currently resident cell. The process can be summarized as follows: for neighboring cells with a higher cell reselection priority than the current cell, measurement must be started unconditionally regardless of how good the signal quality of the currently resident cell is. For neighboring cells with a cell reselection priority less than or equal to the current cell. The UE can measure the signal quality of the currently resident cell and compare the measurement result with the signal quality threshold. If the signal quality of the currently resident cell is greater than or equal to the signal quality threshold, the neighboring cell may not be measured; if the signal quality of the currently resident cell is less than the signal quality threshold, the neighboring cell may be measured.

[0062] As described above, when the UE performs measurements and cell reselection, the cell reselection priority of the neighboring cell is needed. The cell reselection priority of NR inter-frequency and inter-system is configured by the system message or RRC Release message, or is inherited from the inter-system when performing inter-system reselection. If the cell reselection priority is configured by dedicated signaling (such as RRC Release message), the UE should ignore the cell reselection priority provided in the system message. When the UE performs cell reselection in the same-frequency cell, the cell reselection priority will be ignored, that is, the cell reselection priority of the same-frequency cell is the same.

[0063] For neighboring cell information and cell reselection priority, the UE can obtain it from the system message of the current serving cell. For example, this information is configured by the network side and sent to the UE through cell broadcast. The value range of the cell reselection priority (cellReselectionPriority) parameter is (0-7). The larger the value of this parameter, the higher the cell reselection priority of all cells on the corresponding carrier frequency. In addition, the NR system also configures a cell reselection sub-priority (CellReselectionSubPriority) parameter for each carrier frequency, so that the cell reselection priority of the carrier frequency can be divided at a finer granularity. The value of the cell reselection sub-priority parameter is 0.2 / 0.4 / 0.6 / 0.8.

[0064] The RRC Release message can provide the UE with dedicated cell reselection priorities through the cellReselectionPriorities parameter. This parameter also indicates the cell reselection priority by indicating the cellReselectionPriority and CellReselectionSubPriority corresponding to the corresponding frequency. When the UE receives the cell reselection priority, it will ignore the cell reselection priority carried in the system information.

[0065] The cell reselection priority is based on carrier frequency, not cell frequency. For example, cells with the same carrier frequency on the same radio access technology (RAT) have the same cell reselection priority, while cells with different carrier frequencies may have the same or different reselection priorities.

[0066] For high-priority neighboring cells (or high-priority cells), the UE unconditionally initiates measurement. A high-priority neighboring cell refers to a neighboring cell whose corresponding cell reselection priority is higher than the cell reselection priority of the currently camped cell. The cell reselection priority corresponding to a cell refers to the cell reselection priority corresponding to the frequency of the cell.

[0067] For neighboring cells of equal priority (or cells of equal priority, which may include intra-frequency cells and / or inter-frequency cells of the current cell), if it is an intra-frequency cell and Srxlev≤SIntraSearchP and Squal≤SIntraSearchQ, the UE performs intra-frequency measurement. If it is an inter-frequency cell and Srxlev≤SnonIntraSearchP and Squal≤

[0068] SnonIntraSearchQ, the UE performs measurements on NR inter-frequency cells. Neighboring cells of equal priority refer to neighboring cells with the same cell reselection priority as the cell reselection priority of the currently resident cell.

[0069] For low-priority neighbor cells (or low-priority cells, where only inter-frequency and inter-system low-priority neighbor cells may exist), if Srxlev ≤ SnonIntraSearchP and Squal ≤ SnonIntraSearchQ, the UE performs NR inter-frequencies or inter-RAT cell measurements. A low-priority neighbor cell is one whose corresponding cell reselection priority is lower than the cell reselection priority of the currently camped cell.

[0070] The parameters mentioned above can be found in Table 1.

[0071] Table 1

[0072] In Table 1, "field" refers to a field used to carry corresponding parameters.

[0073] After the cell measurement is completed, the UE starts to determine the signal quality of the cell, or the UE determines whether the measured cell meets the cell reselection condition.

[0074] 1. Identification of high-priority cells (or high-priority neighboring cells).

[0075] For a high priority cell, if the system message (e.g. SIB2) of that cell broadcasts threshServingLowQ and more than 1 second has elapsed since the UE camped on the currently camped cell, cell reselection to an NR frequency or inter-RAT frequency with a higher cell reselection priority than the cell reselection priority corresponding to the frequency of the currently camped cell shall be performed if: a cell with a higher priority NR or evolved UMTS terrestrial radio access network (E-UTRAN) RAT / frequency is not reached within the time interval Treselection RAT During this period, the following relationship is satisfied: Squal>Thresh X,HighQ

[0076] (Formula 1)

[0077] Otherwise, cell reselection to an NR frequency or inter-RAT frequency with a higher cell reselection priority than the cell reselection priority corresponding to the frequency of the currently camped cell shall be performed in the following cases: a cell of the RAT or frequency with a higher cell reselection priority is not reached within the time interval Treselection RAT During this period, the following relationship is satisfied: Srxlev>Thresh X,HighP

[0078] (Formula 2)

[0079] And, in addition to satisfying Formula 2, the cell with the RAT or frequency having a higher cell reselection priority is selected in the time interval Treselection RAT The period also satisfies that more than 1 second has passed since the UE camped on the current camped cell.

[0080] 2. Identification of cells of equal priority (or, adjacent cells of equal priority).

[0081] For cells of equal priority, cell reselection is performed based on the R criterion. The so-called R criterion is to calculate a rank (Rank, R) value for each neighboring cell and the current resident cell based on the signal quality of the cell, and sort by the size of the R value. If the R value of a neighboring cell is greater than the R value of the current resident cell, then the neighboring cell meets the cell reselection conditions. If multiple neighboring cells meet the cell reselection conditions, the one with the best signal quality can be selected from these multiple neighboring cells. If a neighboring cell continues to meet the R criterion for a period of time exceeding TreselectionRAT, and the UE has been resident in the current resident cell for more than 1 second, the UE initiates reselection to the neighboring cell.

[0082] 3. Identification of low-priority cells (or low-priority neighboring cells).

[0083] For low-priority cells, the cell reselection conditions are more stringent than those for reselecting to high-priority cells or cells of equal priority. This is described below.

[0084] A. No cell among the high-priority cells meets the high-priority cell reselection conditions;

[0085] B. No cell among the cells of equal priority meets the conditions for reselection of cells of equal priority;

[0086] C. If a system message (e.g. SIB2) broadcasts threshServingLowQ and more than 1 second has elapsed since the UE camped on the currently camped cell, cell reselection to an NR frequency or inter-RAT frequency with a lower cell reselection priority than the cell reselection priority corresponding to the frequency of the currently camped cell shall be performed if:

[0087] (1) The serving cell meets Squal <ThreshServing,LowQ;

[0088] (2) The cell of the lower priority RAT or frequency is selected in the time interval Treselection RAT During the period, Squal>Thresh X,LowQ .

[0089] Otherwise, cell reselection to an NR frequency or inter-RAT frequency with a lower cell reselection priority than the cell reselection priority corresponding to the frequency of the currently camped cell shall be performed in the following cases:

[0090] a. The current resident cell meets Srxlev <ThreshServing,LowP;

[0091] b. The RAT or frequency cell with lower cell reselection priority is selected in the time interval TreselectionRAT During the period, Srxlev>Thresh X, LowP ;

[0092] c. More than 1 second has passed since the UE camped on the current camped cell.

[0093] The parameters in the above process can be found in Table 2.

[0094] Table 2

[0095] After completing the neighboring cell measurement and confirming that there is a cell that meets the cell reselection conditions, the UE will begin to attempt to camp on the new cell. The following describes the UE camping process.

[0096] 1. The UE searches for the target cell.

[0097] 2. After searching for a target cell, the UE receives a system message from the target cell and determines whether the target cell can be normally camped on. For example, the UE determines whether the target cell is barred or reserved, or determines the access level, etc. based on the system message.

[0098] 3. After receiving the system message, the UE camps on the target cell. For example, if the target cell is not barred, the UE can camp on the target cell. At this point, the UE has reselected a new cell.

[0099] The above cell reselection-related content (such as cell reselection conditions and cell reselection procedures) is only an example and does not constitute a limitation to the embodiments of the present application. For example, the UE in the embodiments of the present application may also adopt other cell reselection conditions and / or other procedures to perform cell reselection.

[0100] The previous article introduced the content related to cell reselection. The following article introduces the content related to multicast services or broadcast services.

[0101] To alleviate network congestion, a proposal has been made to support UEs participating in multicast sessions receiving multicast services in the RRC Inactive state. For example, a cell releases a UE into the RRC Inactive state using an RRC Release message. This RRC Release message may indicate the cell reselection priority corresponding to the frequency used for receiving multicast services in the RRC Inactive state. The UE can then reselect to a cell with that frequency to receive multicast services in the RRC Unconnected state.

[0102] However, there may be problems with this approach. For example, referring to Figure 1, the UE in cell 1 at frequency 1 is released to the RRC non-connected state, and the RRC release message sent by cell 1 to the UE indicates frequency 2. The UE can then reselect to cell 2 at frequency 2 to receive multicast services in cell 2. Although cell 2 is a cell at frequency 2, it may not provide multicast services in the RRC non-activated state. That is, other cells except cell 2 at frequency 2 may provide multicast services in the RRC non-activated state, but cell 2 does not. It can be seen that the UE may reselect an inappropriate cell through the current mechanism, resulting in the UE being unable to receive multicast services in the RRC non-connected state.

[0103] In view of this, the embodiment of the present application sets a frequency effective range. For example, a cell within the effective range may provide multicast services in the RRC non-connected state. Then, the RRC release message indicates the first frequency. When the first device performs a cell reselection or cell selection process, if the first candidate cell is selected, it does not directly reside in the first candidate cell, but determines whether the first candidate cell is included in the effective range corresponding to the first frequency. For example, if it is included in the effective range, it indicates that the first candidate cell may provide multicast services in the RRC non-connected state. The first device can reside in the first candidate cell, thereby increasing the probability of the first device successfully receiving the multicast service in the RRC non-connected state in the newly resided cell. Optionally, if the first candidate cell is not included in the effective range, the first device may not reside in the first candidate cell. For example, the first device can continue to select other candidate cells to receive multicast services in the RRC non-connected state as much as possible, rather than entering the RRC connected state in the first candidate cell to receive multicast data, thereby reducing the situation of entering the RRC connected state and alleviating the congestion of the cell.

[0104] The technical solutions provided in the embodiments of the present application can be applied to the fourth generation mobile communication technology (the 4th generation, 4G) system, such as the LTE system, or can be applied to the fifth generation mobile communication technology (the 5th generation, 5G) system, such as the NR system, or can also be applied to the next generation mobile communication system or other similar communication systems, such as the sixth generation mobile communication technology (the 6th generation, 6G) system, etc., without specific limitation. In addition, the technical solutions provided in the embodiments of the present application can be applied to the side link (SL). For example, the SL belongs to a D2D scenario, such as an NR-D2D scenario, etc., or belongs to a V2X scenario, such as an NR-V2X scenario, etc. For example, the embodiments of the present application can be used in fields such as factory manufacturing, whole-house intelligence, intelligent driving, assisted driving, intelligent connected vehicles, or indoor commercial scenarios.

[0105] Reference may be made to Figure 2, which shows a communication network architecture applicable to an embodiment of the present application. Figure 2 includes a UE, which resides in cell 1. The UE then initiates a cell reselection process and selects a cell using the method provided in an embodiment of the present application. Alternatively, the UE may not initially have a cell in which to reside, and the UE may initiate a cell selection process and select a cell using the method provided in an embodiment of the present application. For example, cell 2 in Figure 2 is a candidate cell in a cell reselection or cell selection process. The frequency of cell 2 is the same as or different from the frequency of cell 1. The UE is capable of executing the method provided in an embodiment of the present application.

[0106] In order to better introduce the embodiments of the present application, the method provided by the embodiments of the present application is introduced below in conjunction with the accompanying drawings. In various embodiments of the present application, the RRC non-connected state of the UE may refer to a state in which there is no connection between the RRC layer of the UE and the RRC layer of the access network device, such as an RRC idle state or an RRC inactive state. In various embodiments of the present application, multicast services are taken as an example for introduction. Optionally, the multicast service may also be replaced by a broadcast service or a multicast service. Various embodiments of the present application may involve a cell reselection process, or involve a cell selection process. In the following text, the cell reselection process is mainly used as an example. Unless otherwise specified in the following text, the steps represented by dotted lines in the accompanying drawings corresponding to the various embodiments of the present application are all optional steps.

[0107] The various embodiments of the present application can be performed by a first device. The first device is, for example, a UE, or a functional module that can execute the method provided in the embodiment of the present application. The functional module can be set in the UE, such as a chip system in the UE; or the functional module can also be set independently of the UE. In the following introduction, the first device is taken as an example that it is a UE. The methods provided in the various embodiments of the present application can be applied to the network architecture shown in Figure 2. For example, the UE involved in the various embodiments of the present application can be the UE in Figure 2.

[0108] An embodiment of the present application provides a communication method. Please refer to Figure 3, which is a flowchart of the method.

[0109] S301: A first cell sends an RRC release message to a UE. Correspondingly, the UE receives the RRC release message from the first cell.

[0110] The RRC release message may be used to release the UE to an RRC non-connected state, or the RRC release message may be used to release the UE to receive multicast services in an RRC non-connected state. In addition, the RRC release message may also indicate a first frequency, where the first frequency is, for example, a frequency that may provide multicast services in an RRC non-connected state, or a cell at the first frequency may provide multicast services in an RRC non-connected state, or a cell at the first frequency has a high probability of providing multicast services in an RRC non-connected state, or a cell at the first frequency is capable of providing multicast services in an RRC non-connected state, or a cell at the first frequency supports providing multicast services in an RRC non-connected state, or a cell at the first frequency is currently providing multicast services in an RRC non-connected state, or a cell at the first frequency is about to provide multicast services in an RRC non-connected state. Whether a cell provides multicast services in an RRC non-connected state may be determined based on the degree of network congestion, and therefore may change dynamically. For example, a cell may provide multicast services in an RRC non-connected state in a certain time period, but may not provide multicast services in an RRC non-connected state in the following time period. Therefore, in the embodiment of the present application, the first frequency is a frequency that "may" provide multicast services in the RRC non-connected state, that is, the first frequency may not be a frequency that "must" provide multicast services in the RRC non-connected state.

[0111] Optionally, the RRC release message may also indicate the priority of the first frequency. This priority may be the cell reselection priority described above, hereinafter referred to as the priority. The priority of the first frequency may be used by the UE to perform cell reselection to receive multicast services in an RRC non-connected state; alternatively, the UE may perform cell reselection to receive multicast services in an RRC non-connected state, and the priority of the first frequency may be used during the cell reselection process. For example, the UE may perform cell reselection to receive multicast services in an RRC non-connected state, and the priority of the first frequency may be used during the cell reselection process. The first frequency may include one or more frequencies, and the priorities corresponding to different frequencies in these one or more frequencies may be the same or different. Optionally, because the cell under the first frequency may provide multicast services in an RRC non-connected state, the first frequency may be considered a frequency providing multicast services in an RRC non-connected state. Therefore, the first frequency may also be referred to as a dedicated frequency, and the priority of the first frequency may also be understood as a dedicated frequency priority. Furthermore, the one or more frequencies included in the first frequency may include or exclude the frequency of the first cell.

[0112] Optionally, the RRC release message may further indicate the effective range of the first frequency; or the effective range may not be indicated by the RRC release message. For example, the effective range may be predefined by a protocol, or preconfigured in the UE, or indicated by other messages from the first cell (for example, an MBS control channel (MCCH) message or an RRC reconfiguration message, etc.). The effective range of the first frequency may indicate a cell or area that provides an RRC non-connected multicast service at the first frequency. For example, the effective range may indicate a cell or area that may provide an RRC non-connected multicast service at the first frequency, or indicate a cell or area that has a high probability of providing an RRC non-connected multicast service at the first frequency, or indicate a cell or area that supports providing an RRC non-connected multicast service at the first frequency, or indicate a cell or area that is currently providing an RRC non-connected multicast service at the first frequency, or indicate a cell or area that will soon provide an RRC non-connected multicast service at the first frequency. Among them, if the first frequency includes one frequency, the effective scope of the first frequency may include the effective scope of the frequency; or, if the first frequency includes multiple frequencies, the effective scope of the first frequency may respectively include the effective scope of each of the multiple frequencies. Optionally, for a certain frequency included in the first frequency, the effective scope corresponding to the frequency may be empty or may not be empty. If it is empty, it indicates that there is no cell or area that may provide multicast services in the RRC non-connected state at the frequency, or that there is no cell or area that is currently providing multicast services in the RRC non-connected state at the frequency, or that there is no cell or area that supports the provision of multicast services in the RRC non-connected state at the frequency, or that there is no cell or area that will soon provide multicast services in the RRC non-connected state at the frequency.

[0113] Optionally, the effective scope of the first frequency (or the effective scope of a certain frequency A in the first frequency) may include (or indicate) one or more of the following: information of some or all cells under the first frequency (or frequency A) (e.g., cell identifiers), one or more radio access network-area codes (RNAs) under the first frequency (or frequency A), or one or more tracking area codes (tracking area codes) under the first frequency (or frequency A). For example, if the effective scope includes information of some or all cells under the first frequency, then the effective scope is equivalent to indicating that these cells may provide multicast services in the RRC non-connected state. For another example, if the effective scope of the first frequency includes one or more RNAs under the first frequency, then the effective scope is equivalent to indicating that the cells within these RNAs may provide multicast services in the RRC non-connected state. For another example, if the effective scope of the first frequency includes one or more tracking area codes under the first frequency, then the effective scope is equivalent to indicating that the cells corresponding to these tracking area codes may provide multicast services in the RRC non-connected state.

[0114] For example, the RRC release message indicates the following: frequency f1, the priority of frequency f1 (priority 5), the effective range of frequency f1 (cell 0, cell 7); frequency f2, the priority of frequency f2 (priority 6), the effective range of frequency f2 (cell 1); frequency f3, the priority of frequency f3 (priority 4), the effective range of frequency f3 (cell 5, cell 6).

[0115] Among them, the first frequency may include one or more frequencies, and the one or more frequencies may include the frequency of the first cell and / or the frequencies of other cells except the first cell. The other cells may include cells provided by the network device corresponding to the first cell and / or cells provided by other network devices except the network device. If the effective range is indicated by the RRC release message or other messages from the first cell, and the first frequency includes frequencies provided by other network devices except the network device corresponding to the first cell, the effective range corresponding to these frequencies can be obtained through interaction between network devices. For example, the network device corresponding to the first cell can receive messages from other network devices through the Xn interface, and the message may indicate the effective range corresponding to some or all frequencies corresponding to the other network devices. Optionally, the message is, for example, a next generation (NG)-radio access network (RAN) mode configuration update message.

[0116] S302. The UE enters an RRC unconnected state based on the RRC release message.

[0117] The RRC release message is used to release the UE, so the UE can enter the RRC non-connected state after receiving the RRC release message. The UE enters the RRC non-connected state and performs a cell selection process. The UE can select and reside in a second cell, which is, for example, the first cell or a cell other than the first cell.

[0118] S303: If the first candidate cell at the first frequency is included in the valid range corresponding to the first frequency, the UE resides in the first candidate cell. Alternatively, if the first candidate cell at the first frequency is not included in the valid range corresponding to the first frequency, the UE does not reside in the first candidate cell.

[0119] For example, S303 includes a cell reselection process in which the UE may perform cell reselection on a second cell. The second cell may be the first cell, i.e., the UE may perform cell reselection after the first cell enters an RRC unconnected state. For example, the UE may move in the first cell and may perform cell reselection when it moves to the edge of the first cell.

[0120] Alternatively, the second cell and the first cell may be different cells. For example, if the UE performs cell reselection after entering the RRC non-connected state in the first cell and reselects to the second cell, the UE may camp on the second cell and, after camping on the second cell, may perform cell reselection again. Alternatively, the UE may perform cell selection when the first cell is released from the RRC non-connected state and enter the second cell. After camping on the second cell, the UE may perform cell reselection again. The UE may perform cell reselection in the second cell in different ways, as described below.

[0121] 1. The first optional cell reselection method of the UE.

[0122] Optionally, for one or more frequencies in the first frequency, the UE may set the priority of the frequency with the highest priority as the current highest priority, or the UE may set the priority of the frequency with the highest priority and the corresponding effective range not being empty as the current highest priority, or the UE may set the priority of the frequency with the highest priority and the corresponding effective range not being empty, and the corresponding effective range not including or not only including the second cell as the current highest priority. The UE setting the priority of a frequency as the highest priority can also be described as the UE setting the frequency as the frequency with the highest priority. When performing cell reselection, the UE can preferentially determine whether it can reselect the candidate cell under the frequency with the highest priority. An effective range includes not only the second cell, for example, the effective range may include information of multiple cells, and these multiple cells may include the second cell, and may also include other cells except the second cell.

[0123] For example, the RRC release message indicates the following: frequency f1, the priority of frequency f1 (priority 5), the effective range of frequency f1 (cell 0, cell 7); frequency f2, the priority of frequency f2 (priority 6), the effective range of frequency f2 (cell 1); frequency f3, the priority of frequency f3 (priority 4), the effective range of frequency f3 (cell 5, cell 6). For example, cell 1 is the second cell. Among them, priority 6 is higher than priority 5, and priority 5 is higher than priority 4. Among these three priorities, priority 6 is the highest. However, the effective range of frequency f2 corresponding to priority 6 only includes the second cell. Since the UE is currently residing in the second cell, the UE can ignore frequency f2, but can set the priority of frequency f1 (priority 5) to the current highest priority, or set frequency f1 to the frequency with the highest priority.

[0124] When performing cell reselection, the UE may prioritize cells at the frequency corresponding to the current highest priority from the candidate cell list. For example, if the UE sets priority 5 as the current highest priority, the UE may prioritize cells at frequency f1. For example, if the UE selects candidate cell 1 at frequency f1 from the candidate cell list, the UE may measure candidate cell 1 using the measurement method for high-priority cells. After obtaining the measurement results, the UE may determine whether the signal quality of candidate cell 1 meets the cell reselection criteria based on the measurement results. If candidate cell 1 does not meet the cell reselection criteria, the UE does not camp on candidate cell 1. For example, the UE selects the next candidate cell in the candidate cell list, where the UE still prioritizes the candidate cell at the frequency corresponding to the current highest priority, such as the candidate cell at frequency f1. If the candidate cell list no longer includes candidate cells at frequency f1, the UE may select candidate cells at frequencies corresponding to the next priority level within the first frequency (also included in the first frequency) in descending order of priority. Optionally, if the UE selects a candidate cell at a frequency corresponding to the next priority level within the first frequency from the candidate cell list, the UE may set the next priority level as the current highest priority. For example, continuing with the above example, the first frequency includes frequency f1, frequency f2, and frequency f3 as described above. Since the UE has ignored frequency f2 and there is no suitable candidate cell among the candidate cells under frequency f1, the next priority in the first frequency is priority 4. Priority 4 in the first frequency corresponds to frequency f3, and the UE can select the candidate cell under frequency f3 from the candidate cell list. Optionally, the UE can set priority 4 as the current highest priority. After selecting the candidate cell under frequency f3, the UE performs similar steps to those after selecting candidate cell 1.

[0125] Alternatively, if the UE determines, based on the measurement results, that candidate cell 1 meets the cell reselection conditions, the UE may continue to determine whether candidate cell 1 is located within the effective range corresponding to the first frequency. For example, if candidate cell 1 is a cell under frequency f1, the effective range corresponding to the first frequency includes the effective range corresponding to frequency f1, and the effective range corresponding to frequency f1 is (cell 0, cell 7), the UE may determine whether candidate cell 1 is cell 0 or cell 7. If candidate cell 1 is cell 0 or cell 7, the UE may reside in candidate cell 1. Alternatively, if candidate cell 1 is neither cell 0 nor cell 7, the UE does not reside in candidate cell 1, and the UE selects the next candidate cell in the candidate cell list. The selection method may refer to the introduction in the previous paragraph.

[0126] According to the above, the UE can execute the process of setting the highest priority. According to the above introduction to the cell reselection process, when the UE measures the cell, the measurement method for high-priority cells, equal-priority cells, and low-priority cells is different. So, if the UE executes the process of setting the highest priority, then for any selected candidate cell, when measuring the signal quality, the UE will measure the candidate cell as a high-priority cell, that is, the signal quality of the any candidate cell will be measured according to the measurement method for the high-priority cell. Similarly, when the UE determines the signal quality of the cell (that is, determines whether the cell meets the cell reselection conditions), the determination method for high-priority cells, equal-priority cells, and low-priority cells is also different. So, if the UE executes the process of setting the highest priority, then for any selected candidate cell, when determining the signal quality, the UE will determine the candidate cell as a high-priority cell, that is, the signal quality of the any candidate cell will be determined according to the determination method for the high-priority cell.

[0127] For example, referring to Figure 4A, it is a flowchart of a cell reselection process under the first cell reselection method of the UE. Figure 4A takes the UE setting the highest priority as an example. According to Figure 4A, after the UE resides in the second cell, it performs cell reselection. If there is a high-priority candidate cell (for example, the UE selects the cell under the frequency corresponding to the current highest priority (the highest priority set by the UE) from the candidate cell list), the UE can measure the candidate cell according to the measurement method for the high-priority cell, and determine whether the candidate cell meets the cell reselection condition based on the measurement result. If the candidate cell meets the cell reselection condition, the UE can continue to determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell. If the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE resides in the candidate cell; or, if the candidate cell is not included in the effective range corresponding to the frequency of the candidate cell, the UE does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0128] Or if the candidate cell does not meet the cell reselection condition, the UE does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0129] Alternatively, there is another embodiment, the UE may not have to perform the process of setting the highest priority, for example, the UE may not have to set the priority corresponding to the frequency to be selected as the highest priority. For example, the first frequency includes one or more frequencies, and these one or more frequencies correspond to respective priorities, and these priorities are the same or different. When performing cell reselection, the UE may give priority to determining whether it can reselect the candidate cell under the frequency with the highest priority among the one or more frequencies (the highest priority is the actual highest priority, not the highest priority set by the UE), or the UE may give priority to determining whether it can reselect the frequency with the highest corresponding priority among the one or more frequencies and whose effective range is not empty, or the UE may give priority to determining whether it can reselect the frequency with the highest priority among the one or more frequencies, whose corresponding effective range is not empty, and whose corresponding effective range does not include or not only includes the second cell.

[0130] For example, continuing with the previous example, priority 6 is the highest among the three priorities indicated by the RRC release message. However, the frequency f2 corresponding to priority 6 only includes the second cell within its effective range. Since the UE is currently residing in the second cell, the UE can ignore frequency f2 when performing cell reselection. Alternatively, if the UE believes that there are no candidate cells under frequency f2, the UE can prioritize whether it can reselect to a candidate cell under frequency f1. The UE's cell reselection process can be referred to above, with the difference that in this embodiment, the UE does not need to perform the process of setting the highest priority, thereby simplifying the UE's cell reselection process.

[0131] If the UE does not perform the process of setting the highest priority, then for a selected candidate cell, the UE may determine the relationship between the priority corresponding to the frequency of the candidate cell and the priority corresponding to the frequency of the second cell when performing measurement. For example, if the priority corresponding to the frequency of the candidate cell is higher than the priority corresponding to the frequency of the second cell, the UE may measure the candidate cell as a high-priority cell, that is, measure the signal quality of the candidate cell in accordance with the measurement method for a high-priority cell; or, if the priority corresponding to the frequency of the candidate cell is equal to the priority corresponding to the frequency of the second cell, the UE may measure the candidate cell as an equal-priority cell, that is, measure the signal quality of the candidate cell in accordance with the measurement method for equal-priority cells; or, if the priority corresponding to the frequency of the candidate cell is lower than the priority corresponding to the frequency of the second cell, the UE may measure the candidate cell as a low-priority cell, that is, measure the signal quality of the candidate cell in accordance with the measurement method for a low-priority cell. Similarly, for a selected candidate cell, the UE may also determine the relationship between the priority corresponding to the frequency of the candidate cell and the priority corresponding to the frequency of the second cell when judging the signal quality. For example, if the priority corresponding to the frequency of the candidate cell is higher than the priority corresponding to the frequency of the second cell, the UE may judge the candidate cell as a high-priority cell, that is, judge the signal quality of the candidate cell according to the method of judging high-priority cells; or, if the priority corresponding to the frequency of the candidate cell is equal to the priority corresponding to the frequency of the second cell, the UE may judge the candidate cell as an equal-priority cell, that is, judge the signal quality of the candidate cell according to the method of judging equal-priority cells; or, if the priority corresponding to the frequency of the candidate cell is lower than the priority corresponding to the frequency of the second cell, the UE may judge the candidate cell as a low-priority cell, that is, judge the signal quality of the candidate cell according to the method of judging low-priority cells.

[0132] For example, refer to Figure 4B, which is a flowchart of another cell reselection process under the first cell reselection method of the UE. Figure 4B takes the case where the UE does not set the highest priority as an example. According to Figure 4B, after the UE resides in the second cell, it performs cell reselection. If there is a high-priority candidate cell (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is higher than the priority corresponding to the frequency of the second cell), the UE can measure the candidate cell according to the measurement method of the high-priority cell, and determine whether the candidate cell meets the cell reselection conditions according to the judgment method of the high-priority cell based on the measurement result; or, if there is a candidate cell with the same priority (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is equal to If the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency of the second cell is lower than the priority corresponding to the frequency of the second cell), the UE may measure the candidate cell according to the measurement method for the candidate cell of the same priority, and determine whether the candidate cell meets the cell reselection condition according to the determination method for the same priority cell based on the measurement result; or, if there is a candidate cell with a lower priority (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is lower than the priority corresponding to the frequency of the second cell), the UE may measure the candidate cell according to the measurement method for the lower priority cell, and determine whether the candidate cell meets the cell reselection condition according to the determination method for the lower priority cell based on the measurement result. Regardless of the determination method, if the candidate cell meets the cell reselection condition, the UE may continue to determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell. If the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE camps on the candidate cell; or, if the candidate cell is not included in the effective range corresponding to the frequency of the candidate cell, the UE does not camp on the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0133] Alternatively, regardless of the determination method, if the candidate cell does not meet the cell reselection condition, the UE does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0134] 2. The second optional cell reselection method of the UE.

[0135] In the first cell reselection method as described above, after the UE selects a candidate cell from the candidate cell list, it first measures the candidate cell and determines whether the candidate cell meets the cell reselection conditions based on the measurement results. If the candidate cell meets the cell reselection conditions, the UE then determines whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell (included in the first frequency).

[0136] In the second cell reselection method, after the UE selects a candidate cell from the candidate cell list, it can first measure the candidate cell. After the measurement, the UE may not first determine whether the candidate cell meets the cell reselection condition, but first determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell (included in the first frequency). If the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE can continue to determine whether the candidate cell meets the cell reselection condition. If the candidate cell meets the cell reselection condition, the UE can reside in the candidate cell; or, if the candidate cell does not meet the cell reselection condition, the UE may not reside in the candidate cell, for example, the UE can continue to execute the cell reselection process, or continue to determine the next candidate cell.

[0137] Alternatively, if the candidate cell is not included in the effective range corresponding to the frequency of the candidate cell, the UE may no longer need to determine whether the candidate cell meets the cell reselection condition, but may not reside in the candidate cell. For example, the UE may continue to execute the cell reselection process, or may continue to identify the next candidate cell. It can be seen that in the second cell reselection method, if a candidate cell is not included in the effective range corresponding to the first frequency, the UE may not need to perform the judgment of whether the candidate cell meets the cell reselection condition, which is beneficial to reducing the processing process of the UE and reducing the power consumption of the UE. For more implementation details of the second cell reselection method, such as whether the UE can perform the processing of setting the highest priority, or the UE may not perform the processing of setting the highest priority, as well as the specific reselection process of the UE, please refer to the introduction of the aforementioned first cell reselection method.

[0138] For example, referring to Figure 5A, it is a flowchart of a cell reselection process under the second cell reselection method of the UE. Figure 5A takes the UE setting the highest priority as an example. According to Figure 5A, after the UE resides in the second cell, it performs cell reselection. If there is a high-priority candidate cell (for example, the UE selects a cell at the frequency corresponding to the current highest priority from the candidate cell list), the UE can measure the candidate cell according to the measurement method of the high-priority cell. After the measurement, the UE can determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell. If the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE can determine whether the candidate cell meets the cell reselection condition according to the determination method of the high-priority cell based on the measurement result of the candidate cell. If the candidate cell meets the cell reselection condition, the UE can reside in the candidate cell; or if the candidate cell does not meet the cell reselection condition, the UE may not reside in the candidate cell and continue to perform cell reselection, or continue to determine the next candidate cell.

[0139] Alternatively, if the candidate cell is not included in the valid range corresponding to the frequency of the candidate cell, the UE may not reside in the candidate cell, for example, continue to perform cell reselection, or continue to determine the next candidate cell.

[0140] For another example, please refer to FIG5B, which is a flowchart of another cell reselection process under the second cell reselection method of the UE. FIG5B takes the case where the UE does not set the highest priority as an example. According to FIG5B, after the UE camps on the second cell, it can be seen that the cell reselection is performed. If there is a high-priority candidate cell (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is higher than the priority corresponding to the frequency of the second cell), the UE can measure the candidate cell according to the measurement method for the high-priority cell; or, if there are candidate cells with equal priority (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is equal to the priority corresponding to the frequency of the second cell), the UE can measure the candidate cell according to the measurement method for the equal-priority cell; or, if there is a low-priority candidate cell (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is lower than the priority corresponding to the frequency of the second cell), the UE can measure the candidate cell according to the measurement method for the low-priority cell. Regardless of whether the candidate cell is a high-priority cell, an equal-priority cell, or a low-priority cell, after measurement, the UE can determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell. If the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE can determine whether the candidate cell meets the cell reselection condition based on the measurement result. If the candidate cell is a high-priority cell, the UE determines whether the candidate cell meets the cell reselection condition according to the determination method for high-priority cells; or, if the candidate cell is an equal-priority cell, the UE determines whether the candidate cell meets the cell reselection condition according to the determination method for equal-priority cells; or, if the candidate cell is a low-priority cell, the UE determines whether the candidate cell meets the cell reselection condition according to the determination method for low-priority cells. Regardless of the determination method, if the candidate cell meets the cell reselection condition, the UE resides in the candidate cell; or, if the candidate cell does not meet the cell reselection condition, the UE does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0141] Alternatively, if the candidate cell is not included in the valid range corresponding to the frequency of the candidate cell, the UE does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0142] 3. The third optional cell reselection method of the UE.

[0143] In the third cell reselection method, after the UE selects a candidate cell from the candidate cell list, it may not first measure the candidate cell, but instead determine whether the candidate cell is included in the effective range corresponding to the first frequency. If the candidate cell is included in the effective range corresponding to the first frequency, the UE may measure the candidate cell and determine whether the candidate cell meets the cell reselection conditions. If the candidate cell meets the cell reselection conditions, the UE may reside in the candidate cell; alternatively, if the candidate cell does not meet the cell reselection conditions, the UE may not reside in the candidate cell, for example, the UE may continue the cell reselection process or continue to identify the next candidate cell.

[0144] Alternatively, if the candidate cell is not included in the effective range corresponding to the first frequency, the UE may no longer perform processes such as measurement, but may not reside in the candidate cell. For example, the UE may continue to perform the cell reselection process. It can be seen that in the third cell reselection method, if a candidate cell is not included in the effective range corresponding to the first frequency, the UE may not have to perform more processes such as measurement, which can reduce the UE's processing to a greater extent and further reduce the UE's power consumption. For more implementation details of the third cell reselection method, such as whether the UE can perform the processing of setting the highest priority, or whether the UE can also not perform the processing of setting the highest priority, as well as the specific reselection process of the UE, please refer to the introduction of the first cell reselection method mentioned above.

[0145] For example, referring to Figure 6A, which is a flowchart of a cell reselection process under the third cell reselection method of the UE, Figure 6A takes the UE setting the highest priority as an example. According to Figure 6A, after the UE resides in the second cell, it performs cell reselection. If there is a high-priority candidate cell (for example, the UE selects a cell at the frequency corresponding to the current highest priority from the candidate cell list), the UE can determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell. If the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE can measure the candidate cell according to the measurement method for the high-priority cell, and determine whether the candidate cell meets the cell reselection condition according to the judgment method for the high-priority cell based on the measurement result of the candidate cell. If the candidate cell meets the cell reselection condition, the UE can reside in the candidate cell; or if the candidate cell does not meet the cell reselection condition, the UE may not reside in the candidate cell and continue to perform cell reselection, or continue to judge the next candidate cell.

[0146] Alternatively, if the candidate cell is not included in the valid range corresponding to the frequency of the candidate cell, the UE may no longer perform measurement and other processes, but may not reside in the candidate cell, for example, continue to perform cell reselection.

[0147] For another example, please refer to FIG6B, which is a flowchart of another cell reselection process under the third cell reselection method of the UE. FIG6B takes the case where the UE does not set the highest priority as an example. According to FIG6B, after the UE camps on the second cell, it can be seen that the cell reselection is performed. If there is a high-priority candidate cell (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is higher than the priority corresponding to the frequency of the second cell), the UE can determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell; or, if there are candidate cells of equal priority (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is equal to the priority corresponding to the frequency of the second cell), the UE can determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell; or, if there is a low-priority candidate cell (for example, the UE selects a candidate cell at a certain frequency in the first frequency from the candidate cell list, and the priority corresponding to the frequency is lower than the priority corresponding to the frequency of the second cell), it can determine whether the candidate cell is included in the effective range corresponding to the frequency of the candidate cell. Regardless of whether the candidate cell is a high-priority cell, an equal-priority cell, or a low-priority cell, if the candidate cell is included in the effective range corresponding to the frequency of the candidate cell, the UE may measure the candidate cell and determine whether the candidate cell meets the cell reselection condition based on the measurement result. If the candidate cell is a high-priority cell, the UE measures the signal quality of the candidate cell in accordance with the measurement method for high-priority cells; or, if the candidate cell is an equal-priority cell, the UE measures the signal quality of the candidate cell in accordance with the measurement method for equal-priority cells; or, if the candidate cell is a low-priority cell, the UE measures the signal quality of the candidate cell in accordance with the measurement method for low-priority cells. Furthermore, if the candidate cell is a high-priority cell, the UE determines whether the candidate cell meets the cell reselection condition in accordance with the determination method for high-priority cells; or, if the candidate cell is an equal-priority cell, the UE determines whether the candidate cell meets the cell reselection condition in accordance with the determination method for equal-priority cells; or, if the candidate cell is a low-priority cell, the UE determines whether the candidate cell meets the cell reselection condition in accordance with the determination method for low-priority cells. Regardless of the determination method, if the candidate cell meets the cell reselection condition, the UE resides in the candidate cell; or if the candidate cell does not meet the cell reselection condition, the UE does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0148] Alternatively, if the candidate cell is not included in the valid range corresponding to the frequency of the candidate cell, the UE does not need to perform measurement and other processes, but does not reside in the candidate cell, for example, continues to perform cell reselection, or continues to determine the next candidate cell.

[0149] 4. The fourth optional cell reselection method of the UE.

[0150] In the fourth cell reselection method, the UE can perform screening when generating the candidate cell list. For example, cells included in the effective range corresponding to the first frequency can be added to the candidate cell list, while cells not included in the effective range corresponding to the first frequency may not be added to the candidate cell list. The candidate cell list obtained in this way includes candidate cells that are all within the effective range corresponding to the first frequency. For example, before the UE adds the information of a cell to the candidate cell list, it can first determine whether the cell is included in the effective range corresponding to the first frequency. If the cell is included in the effective range corresponding to the first frequency, the UE can add the information of the cell to the candidate cell list; if the cell is not included in the effective range corresponding to the first frequency, the UE will not add the information of the cell to the candidate cell list.

[0151] When performing cell reselection, the UE can measure a candidate cell and determine whether the candidate cell meets the cell reselection conditions. If the candidate cell meets the cell reselection conditions, the UE can camp on the candidate cell. Alternatively, if the candidate cell does not meet the cell reselection conditions, the UE may not camp on the candidate cell. For example, the UE can continue the cell reselection process or continue to determine the next cell.

[0152] As can be seen, in the fourth cell reselection method, if a cell is not included in the effective range corresponding to the first frequency, the UE may not consider the cell as a candidate cell, which can greatly simplify the UE's cell reselection process and further reduce the UE's power consumption. For more implementation details of the fourth cell reselection method, such as whether the UE can perform the highest priority setting process or not, as well as the specific UE reselection process, please refer to the introduction to the third cell reselection method mentioned above.

[0153] The specific cell reselection method used by the UE can be configured by the network equipment, predefined by the protocol, preconfigured in the UE, or determined by the UE itself. For measurement conditions and cell reselection conditions corresponding to different cells (high-priority cells, equal-priority cells, and low-priority cells), please refer to the previous description.

[0154] If the UE resides in the first candidate cell, optionally, the UE may receive the multicast service in the first candidate cell in an RRC non-connected state.

[0155] Optionally, for any one or more of the three cell reselection methods described above, a first threshold may be set. The first threshold may be a number threshold, for example, the first threshold may also be referred to as a maximum fallback number, a maximum reselection number, or a maximum selection number, etc., without limitation to the name. The first threshold may be understood as a threshold for the number of times the UE selects a candidate cell from the candidate cell list. For example, during a cell reselection process (the cell reselection process before the UE performs camping is considered a cell reselection process, during which the UE may perform one or more candidate cell selection processes from the cell reselection list), if the number of times the UE selects a candidate cell from the candidate cell list is greater than or equal to the first threshold, the UE may camp on the last selected candidate cell. For example, if the UE selects a candidate cell from the cell candidate list for the Nth time, and N is greater than or equal to the first threshold, and the currently selected candidate cell still cannot camp on, the UE may terminate cell reselection. Even if the currently selected candidate cell still does not meet the conditions (for specific conditions, please refer to the description of any one or more of the three cell reselection methods described above), the UE may still camp on the currently selected candidate cell. This approach reduces the probability of the UE entering a cell reselection dead loop, allowing the UE to resume normal operation. Optionally, the candidate cell finally selected by the UE may not be within the effective range, but may meet other residency conditions such as cell reselection conditions. Otherwise, if the UE resides in a candidate cell with poor signal quality, the UE may be unable to perform the communication process.

[0156] The first threshold may be configured by a network device, such as a network device corresponding to the first cell, a network device corresponding to the second cell, or a network device corresponding to another cell. For example, the network device may configure the first threshold for the UE via information such as a system message, an RRC release message, or an RRC reconfiguration message. Alternatively, the first threshold may be predefined by a protocol, preconfigured in the UE, or configured by the UE itself.

[0157] The embodiments of the present application set a frequency validity range. For example, cells within the validity range may provide multicast services in the RRC non-connected state. Therefore, the RRC release message indicates the first frequency. When the UE performs a cell reselection or cell selection process, if the first candidate cell is selected, it does not directly reside in the first candidate cell. Instead, it determines whether the first candidate cell is included in the validity range corresponding to the first frequency. For example, if it is included in the validity range, it indicates that the first candidate cell may provide multicast services in the RRC non-connected state. In this case, the UE can reside in the first candidate cell, thereby increasing the probability that the UE can successfully receive multicast services in the RRC non-connected state in the newly resided cell. Optionally, if the first candidate cell is not included in the validity range, the UE may not reside in the first candidate cell. For example, the UE can continue to select other candidate cells to receive multicast services in the RRC non-connected state as much as possible, rather than entering the RRC connected state to receive multicast data in the first candidate cell. This can reduce the number of times the UE enters the RRC connected state and alleviate cell congestion. In addition, in the embodiments of the present application, the UE can use different methods when performing cell reselection, which is more flexible.

[0158] Next, another communication method provided in an embodiment of the present application is introduced. Please refer to Figure 7, which is a flowchart of the method.

[0159] S701: The UE determines that a first candidate cell does not provide a multicast service in an RRC non-connected state. For example, the UE is in an RRC non-connected state.

[0160] For example, S701 includes a UE performing a cell reselection process, wherein the UE may perform cell reselection on a second cell. The second cell may be, for example, the first cell, which is the cell to which the UE was released into the RRC non-connected state. That is, the UE was first in the RRC connected state in the first cell and then received an RRC release message in the first cell, entering the RRC non-connected state. After entering the RRC non-connected state in the first cell, the UE may perform cell reselection. For example, if the UE moves in the first cell, cell reselection may be performed when the UE moves to the edge of the first cell.

[0161] Alternatively, the second cell and the first cell may be different cells. For example, if the UE performs cell reselection after entering the RRC non-connected state in the first cell and reselects to the second cell, the UE may camp on the second cell and, after camping on the second cell, may perform cell reselection again; or, if the UE performs cell selection when the first cell is released to the RRC non-connected state and enters the second cell, the UE may perform cell reselection after camping on the second cell.

[0162] During cell reselection, for example, if a UE selects a first candidate cell from a candidate cell list, the UE may determine whether it can camp on the first candidate cell. For example, the UE may measure the first candidate cell and determine, based on the measurement results, whether the first candidate cell meets cell reselection conditions. If the first candidate cell meets the cell reselection conditions, the UE may camp on the first candidate cell. If the first candidate cell does not meet the cell reselection conditions, the UE does not camp on the first candidate cell and may continue cell reselection. Alternatively, whether the UE can camp on the first candidate cell may be determined based on any of the three cell reselection methods provided in the embodiment shown in FIG. 3 . For this purpose, reference may be made to the description of S303 in the embodiment shown in FIG. 3 .

[0163] If the UE determines that it can camp on the first candidate cell, the UE originally expected to receive multicast services in the first candidate cell while in the RRC non-connected state. However, when the UE determines that it can camp on the first candidate cell, the first candidate cell may or may not be providing multicast services in the RRC non-connected state. If the first candidate cell does not currently provide multicast services in the RRC non-connected state, the UE determines that the first candidate cell does not provide multicast services in the RRC non-connected state. For example, if the UE in the RRC non-connected state does not obtain the configuration of the multicast service it expects to receive via an MCCH message in the first candidate cell, it can be determined that the first candidate cell does not provide multicast services in the RRC non-connected state. Alternatively, while in the first cell (or the second cell), the UE receives a first message from the first cell (or the second cell), the first message indicating a first frequency. For an explanation of the first frequency, refer to S301 of the embodiment shown in FIG. 3 . If the first frequency does not include the frequency of the first candidate cell, the UE can determine that the first candidate cell does not provide multicast services in the RRC non-connected state.

[0164] Among them, S701 is an optional step. For example, the UE may not determine or know whether the first candidate cell provides multicast services in the RRC non-connected state, but execute S702; or, before S701, it may also include that the UE determines whether the first candidate cell provides multicast services in the RRC non-connected state, then the determination result may be S701, or may not be S701, but the first cell provides or is providing multicast services in the RRC non-connected state.

[0165] S702: The first candidate cell sends a second message. Correspondingly, the UE receives the second message from the first candidate cell.

[0166] The second message may indicate a second frequency. The second frequency, for example, is a frequency that may provide RRC non-connected multicast services, or a cell at the second frequency may provide RRC non-connected multicast services, and the cell at the second frequency has a higher probability of providing RRC non-connected multicast services. Whether a cell provides RRC non-connected multicast services can be determined based on the level of network congestion and may therefore change dynamically. For example, a cell may provide RRC non-connected multicast services during a certain period of time, but may not provide RRC non-connected multicast services during a subsequent period of time. Therefore, in this embodiment of the present application, the second frequency is a frequency that "may" provide RRC non-connected multicast services, that is, the second frequency may not be a frequency that "definitely" provides RRC non-connected multicast services. The second frequency may include one or more frequencies, and these one or more frequencies may include the frequency of the first candidate cell and / or frequencies of other cells other than the first candidate cell. The other cells may include cells provided by the network device corresponding to the first candidate cell and / or cells provided by network devices other than the network device.

[0167] S703: The UE enters an RRC connected state in the first candidate cell according to the second message (or according to the second frequency) or does not reside in the first candidate cell.

[0168] S703 may be implemented in different ways, which are described below with examples.

[0169] 1. Implementation method A.

[0170] Under implementation method A, the UE enters the RRC connection state in the first candidate cell according to the second message or the second frequency, which may include: if the second frequency includes the frequency of the first candidate cell, the UE enters the RRC connection state in the first candidate cell; or, if the second frequency does not include the frequency of the first candidate cell, the UE does not reside in the first candidate cell, for example, the UE can continue to perform cell reselection.

[0171] The second frequency, for example, is a frequency that may provide multicast services in the RRC non-connected state. If the frequency of the first candidate cell is included in the second frequency, it indicates that the first candidate cell may provide multicast services. In this case, although the first candidate cell does not currently provide multicast services in the RRC non-connected state, it may provide multicast services in the RRC connected state. Therefore, the UE can camp on the first candidate cell and enter the RRC connected state in the first candidate cell. After entering the RRC connected state, the UE has a higher probability of receiving multicast services, thereby improving the UE's success rate in receiving multicast services.

[0172] 2. Implementation method B.

[0173] Under implementation method B, the UE enters the RRC connection state in the first candidate cell according to the second message or the second frequency, which may include: if the first frequency and the second frequency have an intersection, and the intersection includes the frequency of the first candidate cell, the UE enters the RRC connection state in the first candidate cell; or, if the first frequency and the second frequency have no intersection and / or have an intersection but the intersection does not include the frequency of the first candidate cell, the UE does not reside in the first candidate cell, for example, the UE can continue to perform cell reselection.

[0174] Optionally, in implementation B, the method may further include S704: the first cell or the second cell sends a first message, and accordingly, the UE receives the first message. S704 may occur, for example, before S703, before S702, or before S701. FIG7 uses S704 occurring before S701 as an example, and uses the first cell sending the first message as an example. The first message may indicate a first frequency. For an explanation of the first frequency, reference may be made to S301 of the embodiment shown in FIG3 .

[0175] The first frequency includes one or more frequencies, and the second frequency includes one or more frequencies. The UE can determine whether the frequencies included in the first frequency and the frequencies included in the second frequency overlap. For example, if the first frequency includes frequencies f1, f2, and f3, and the second frequency includes frequencies f2 and f4, then the first frequency and the second frequency overlap, and this overlap is frequency f2. For another example, if the first frequency includes frequencies f1, f2, and f3, and the second frequency includes frequencies f4, f5, and f6, then the first frequency and the second frequency overlap.

[0176] If there is no intersection between the frequencies included in the first frequency and the frequencies included in the second frequency, the UE may not reside in the first candidate cell, for example, the UE may continue to perform cell reselection.

[0177] Alternatively, if the frequencies included in the first frequency and the frequencies included in the second frequency intersect, but the intersection does not include the frequency of the first candidate cell, the UE may not reside in the first candidate cell. For example, the UE may continue to perform cell reselection. For example, if the first frequency includes frequencies f1, f2, and f3, and the second frequency includes frequencies f2 and f4, then the first frequency and the second frequency intersect, and the intersection is frequency f2, but the frequency of the first candidate cell is frequency f4, then the UE may not reside in the first candidate cell.

[0178] Alternatively, if the frequencies included in the first frequency and the frequencies included in the second frequency intersect, and the intersection includes the frequency of the first candidate cell, the UE may camp on the first candidate cell. For example, the first frequency includes frequencies f1, f2, and f3, and the second frequency includes frequencies f2 and f4. If the first frequency and the second frequency intersect, the intersection is frequency f2, and the frequency of the first candidate cell is frequency f2, the UE may camp on the first candidate cell.

[0179] The first frequency is a frequency determined by the first or second cell to provide multicast services in the RRC non-connected state. The multicast services provided by the cell at the first frequency are likely to be of interest to or important to the UE. If the first and second frequencies intersect, the services provided by the cell at the frequency corresponding to the intersection are likely to be multicast services of interest to or important to the UE. If the intersection includes the frequency of the first candidate cell, this indicates that the first candidate cell may provide these multicast services. In this case, although the first candidate cell does not currently provide multicast services in the RRC non-connected state, it may provide multicast services in the RRC connected state. Therefore, the UE can camp on the first candidate cell and enter the RRC connected state in the first candidate cell. After entering the RRC connected state, the UE has a higher probability of receiving multicast services, thereby improving the UE's success rate in receiving multicast services and increasing the probability of the UE receiving multicast services of interest to or important to the UE.

[0180] If the UE enters the RRC connected state in the first candidate cell, optionally, the UE may receive the multicast service in the first candidate cell in the RRC connected state.

[0181] Optionally, the first message described in the embodiment of the present application is, for example, an RRC release message from the first cell, and the UE may be released to the RRC non-connected state by the RRC release message; the second message described in the embodiment of the present application is, for example, an MCCH message from the first candidate cell (the MCCH message in the embodiment of the present application may also be referred to as a multicast MCCH message, etc., without limitation to the name), or a system message from the first candidate cell. The MCCH message can be understood as a message carried by the MCCH. The system message is, for example, an SIB, such as SIB x, where x is, for example, one of the values ​​22, 23, 24, 25, 26, etc.

[0182] Alternatively, the first message described in the embodiment of the present application is, for example, an MCCH message from the first cell or the second cell; the second message described in the embodiment of the present application is, for example, an MCCH message from the first candidate cell.

[0183] Alternatively, the first message described in the embodiment of the present application is, for example, a system message from the first cell or the second cell; the second message described in the embodiment of the present application is, for example, a system message from the first candidate cell. The system message from the first cell or the second cell is, for example, a SIB, such as SIB x, where x is, for example, one of 22, 23, 24, 25, 26, etc.; the implementation of the system message from the first candidate cell is similar.

[0184] If the first message is a system message, an optional implementation for the first message indicating the first frequency is that the first message may indicate a correspondence between the first frequency and an MBS frequency selection area ID (FSAI). If the first frequency includes multiple frequencies, the first message may indicate the FSAI corresponding to each of the multiple frequencies. The FSAI and the MBS session may have a one-to-one correspondence, which is equivalent to the system message not indicating the MBS session, but instead indicating the correspondence between the frequency and the FSAI.

[0185] Optionally, a first threshold may be set for the UE's cell reselection process. The first threshold is a number threshold. For example, the first threshold may also be referred to as the maximum fallback number, the maximum reselection number, or the maximum selection number, etc., without limitation to the name. The first threshold may be understood as the number of times the UE selects a candidate cell from the candidate cell list. For example, during a cell reselection process (the cell reselection process before the UE performs camping is considered a cell reselection process, during which the UE may perform one or more candidate cell selection processes from the cell reselection list), if the number of times the UE selects a candidate cell from the candidate cell list is greater than or equal to the first threshold, the UE may camp on the last selected candidate cell. For example, if the UE selects a candidate cell from the cell candidate list for the Nth time, and N is greater than or equal to the first threshold, and the currently selected candidate cell still cannot camp on, the UE may terminate cell reselection. Even if the currently selected candidate cell still does not meet the conditions (for specific conditions, please refer to the description of any one or more of the three aforementioned cell reselection methods), the UE may still camp on the currently selected candidate cell. This approach reduces the probability of the UE entering a cell reselection dead loop and allows the UE to resume normal operation. Optionally, the candidate cell finally selected by the UE may not be within the effective range, but may meet other residency conditions such as cell reselection conditions. Otherwise, if the UE resides in a candidate cell with poor signal quality, the UE may be unable to perform the communication process.

[0186] The first threshold may be configured by a network device, such as a network device corresponding to the first cell, a network device corresponding to the second cell, or a network device corresponding to another cell. For example, the network device may configure the first threshold for the UE via information such as a system message, an RRC release message, or an RRC reconfiguration message. Alternatively, the first threshold may be predefined by a protocol, preconfigured in the UE, or configured by the UE itself.

[0187] In the embodiment of the present application, although the first candidate cell does not currently provide multicast services in the RRC non-connected state, it can be known through the UE's judgment process that the first candidate cell is likely to provide multicast services in the RRC connected state. Therefore, the UE can reside in the first candidate cell and enter the RRC connected state in the first candidate cell, so that after entering the RRC connected state, it can have a greater probability of receiving multicast services, thereby improving the UE's success rate in receiving multicast services. If the UE determines that the first candidate cell does not currently provide multicast services in the RRC non-connected state and does not make any judgment but directly enters the RRC connected state, then if the frequency of the first candidate cell is not included in the frequencies that may provide multicast services, even if the UE enters the RRC connected state, it may not be able to receive the multicast service. It can be seen that the method provided by the embodiment of the present application can improve the probability of the UE receiving multicast services.

[0188] The embodiment shown in FIG3 and the embodiment shown in FIG7 can be applied in combination. For example, the UE can first camp on the first candidate cell according to the method provided in the embodiment shown in FIG3. If it is determined that the first candidate cell does not provide multicast services in the RRC non-connected state, the UE can continue to perform the method provided in the embodiment shown in FIG7. Alternatively, the embodiment shown in FIG3 and the embodiment shown in FIG7 can be applied separately without being combined.

[0189] FIG8 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device 800 may be a circuit system of a UE as described in the embodiment shown in FIG3 or FIG7 , and is configured to implement the method corresponding to the UE in the above method embodiment. For example, one circuit system is a chip system.

[0190] The communication device 800 includes at least one processor 801. Processor 801 can be used for internal processing of the device to implement certain control processing functions. Optionally, processor 801 includes instructions. Optionally, processor 801 can store data. Optionally, different processors can be independent devices, located in different physical locations, or on different integrated circuits. Optionally, different processors can be integrated into one or more processors, for example, on one or more integrated circuits.

[0191] Optionally, the communication device 800 includes one or more memories 803 for storing instructions. Optionally, data may also be stored in the memories 803. The processor and memory may be provided separately or integrated together.

[0192] Optionally, the communication device 800 includes a communication line 802 and at least one communication interface 804. Since the memory 803, the communication line 802 and the communication interface 804 are all optional, they are indicated by dotted lines in FIG8 .

[0193] Optionally, the communication device 800 may further include a transceiver and / or an antenna. The transceiver may be used to send information to or receive information from other devices. The transceiver may be referred to as a transceiver, a transceiver circuit, an input / output interface, etc., and is used to implement the transceiver function of the communication device 800 through the antenna. Optionally, the transceiver includes a transmitter and a receiver. For example, the transmitter may be used to generate a radio frequency signal from a baseband signal, and the receiver may be used to convert the radio frequency signal into a baseband signal.

[0194] The processor 801 may include a general-purpose central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present application.

[0195] The communication link 802 may include a pathway for transmitting information between the aforementioned components.

[0196] The communication interface 804 uses any transceiver or other device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area network (WLAN), wired access network, etc.

[0197] The memory 803 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, an optical disc storage (including a compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 803 may exist independently and be connected to the processor 801 via the communication line 802. Alternatively, the memory 803 may be integrated with the processor 801.

[0198] The memory 803 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 801. The processor 801 is used to execute the computer-executable instructions stored in the memory 803, thereby implementing the steps performed by the UE in the embodiment shown in Figure 3 or Figure 7.

[0199] Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code, which is not specifically limited in the embodiments of the present application.

[0200] In a specific implementation, as an embodiment, the processor 801 may include one or more CPUs, such as CPU0 and CPU1 in FIG8 .

[0201] In a specific implementation, as an embodiment, the communication device 800 may include multiple processors, such as the processor 801 and the processor 805 in FIG8 . Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. The processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0202] When the device shown in FIG8 is a chip, such as a UE chip, the chip includes a processor 801 (and may also include a processor 805), a communication circuit 802, and a communication interface 804. Optionally, the chip may include a memory 803. Specifically, the communication interface 804 may be an input interface, a pin, or a circuit. The memory 803 may be a register, a cache, or the like. The processor 801 and the processor 805 may be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of any of the above-described embodiments of the communication method.

[0203] The embodiment of the present application can divide the functional modules of the device according to the above-mentioned method example. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. For example, in the case of dividing each functional module corresponding to each function, Figure 9 is a schematic diagram of a device, and the device 900 can be the UE involved in the above-mentioned various method embodiments, or a chip in the UE. The device 900 includes a processing unit 902 and a transceiver unit 901.

[0204] It should be understood that the device 900 can be used to implement the steps performed by the UE in the communication method of the embodiment of the present application. The relevant features can refer to the embodiments shown in Figure 3 or Figure 7 above and will not be repeated here.

[0205] Optionally, the functions / implementation processes of the transceiver unit 901 and the processing unit 902 in FIG9 can be implemented by the processor 801 in FIG8 calling computer-executable instructions stored in the memory 803. Alternatively, the functions / implementation processes of the processing unit 902 in FIG9 can be implemented by the processor 801 in FIG8 calling computer-executable instructions stored in the memory 803, and the functions / implementation processes of the transceiver unit 901 in FIG9 can be implemented by the communication interface 804 in FIG8.

[0206] Optionally, when the device 900 is a chip or circuit, the functions / implementation processes of the transceiver unit 901 may also be implemented via pins or circuits. Optionally, the transceiver unit 901 may include a transmitting unit and / or a receiving unit, where the transmitting unit is configured to implement the transmitting function and the receiving unit is configured to implement the receiving function. Alternatively, the transceiver unit 901 may be an integral module capable of implementing the transmitting function and / or the receiving function. Optionally, the transceiver unit 901 may be implemented via a transceiver.

[0207] The present application also provides a computer-readable storage medium, which stores a computer program or instruction. When the computer program or instruction is executed, the method performed by the UE in the aforementioned method embodiment is implemented. In this way, the functions described in the above embodiments can be implemented in the form of software functional units and sold or used as independent products. Based on this understanding, the technical solution of the present application can be essentially or in other words, the part that contributes or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. Storage media include various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0208] The present application also provides a computer program product, which includes: computer program code, which, when running on a computer, enables the computer to execute the method executed by the UE in any of the aforementioned method embodiments.

[0209] An embodiment of the present application further provides a processing device, including a processor and an interface; the processor is used to execute the method executed by the UE involved in any of the above method embodiments.

[0210] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0211] The various illustrative logic units and circuits described in the embodiments of the present application can be implemented or operated by a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor, and optionally, the general-purpose processor can also be any conventional processor, controller, microcontroller or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

[0212] The steps of the methods or algorithms described in the embodiments of the present application can be directly embedded in hardware, software units executed by a processor, or a combination of the two. The software unit can be stored in RAM, flash memory, ROM, erasable programmable read-only memory (EPROM), EEPROM, registers, hard disks, removable disks, CD-ROMs, or other storage media in any form known in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and storage medium can be provided in an ASIC, which can be provided in a terminal device. Alternatively, the processor and storage medium can also be provided in different components in the terminal device.

[0213] 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.

[0214] The contents of the various embodiments of this application can refer to each other. If there is no special explanation and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0215] It is understood that in the embodiments of the present application, the UE may perform some or all of the steps in the embodiments of the present application. These steps or operations are merely examples. In the embodiments of the present application, other operations or variations of various operations may also be performed. In addition, the steps may be performed in a different order than those presented in the embodiments of the present application, and it is possible that not all operations in the embodiments of the present application need to be performed.

Claims

1. A communication method, characterized in that: The method comprises: Receiving a radio resource control (RRC) release message from the first cell, wherein the RRC release message is used to release the first device to an RRC non-connected state to receive a multicast service, and the RRC release message is also used to indicate a first frequency; Entering the RRC unconnected state based on the RRC release message; If a first candidate cell under the first frequency is included in the effective range corresponding to the first frequency, the cell resides in the first candidate cell.

2. The method according to claim 1, characterized in that The method further comprises: In the RRC unconnected state, a first multicast service is received in the first candidate cell.

3. The method according to claim 1 or 2, characterized in that: The RRC release message is also used to indicate the priority of the first frequency, and the priority of the first frequency is used by the first device to reselect a cell for receiving a multicast service in the RRC non-connected state.

4. The method according to any one of claims 1 to 3, characterized in that: The effective range is used to indicate a cell or area that provides the multicast service in the RRC non-connected state at the first frequency.

5. The method according to any one of claims 1 to 4, characterized in that: The RRC release message is also used to indicate the validity range.

6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: The first frequency is set as the highest priority frequency.

7. The method according to any one of claims 1 to 6, characterized in that: If a first candidate cell at the first frequency is included in a valid range corresponding to the first frequency, and resides before the first candidate cell, the method further includes: measuring the first candidate cell; It is determined according to the measurement result that the first candidate cell meets the cell reselection condition.

8. The method according to any one of claims 1 to 6, characterized in that: If the first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, before camping on the first candidate cell, the method further includes: measuring the first candidate cell; If the first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, residing in the first candidate cell includes: if the first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, determining whether the first candidate cell meets the cell reselection condition according to the measurement result; if the first candidate cell meets the cell reselection condition, residing in the first candidate cell.

9. The method according to any one of claims 1 to 6, characterized in that: If a first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, residing in the first candidate cell includes: If a first candidate cell at the first frequency is included in the effective range corresponding to the first frequency, measuring the first candidate cell; If it is determined according to the measurement result that the first candidate cell meets the cell reselection condition, the cell resides in the first candidate cell.

10. The method according to any one of claims 1 to 9, characterized in that: The method further comprises: If the first candidate cell under the first frequency is not included in the effective range corresponding to the first frequency, the first candidate cell is not retained.

11. The method according to claim 10, characterized in that The method further comprises: If the number of times the candidate cell is selected is greater than or equal to the first threshold, the cell stays in the candidate cell selected last time.

12. A communication method, characterized in that: The method comprises: Determining that the first candidate cell does not provide a multicast service in an RRC non-connected state; receiving a second message from the first candidate cell, where the second message is used to indicate a second frequency; If the second frequency includes the frequency of the first candidate cell, an RRC connected state is entered in the first candidate cell.

13. The method according to claim 12, characterized in that The second message is also used to indicate the priority of the second frequency, and the priority of the second frequency is used by the first device to perform cell reselection for receiving multicast services in the RRC non-connected state.

14. The method according to claim 12 or 13, characterized in that The method further comprises: If the second frequency does not include the frequency corresponding to the first candidate cell, the first candidate cell is not retained.

15. The method according to claim 12 or 13, characterized in that If the second frequency includes the frequency of the first candidate cell, entering the RRC connected state in the first candidate cell includes: If the first frequency and the second frequency have an intersection, and the intersection includes the frequency of the first candidate cell, when the first candidate cell enters the RRC connection state, the first frequency is the frequency indicated by the first message received in the source cell.

16. The method according to any one of claims 12 to 15, characterized in that: The method further comprises: If the number of times the candidate cell is selected is greater than or equal to the first threshold, the candidate cell selected last time enters the RRC connected state.

17. The method according to any one of claims 12 to 16, characterized in that: The first message is an RRC release message or a multicast broadcast service control channel MCCH message, and the second message is an MCCH message; or, The first message is an RRC release message or a system message, and the second message is a system message.

18. A communication device, characterized in that: The communication device comprises a processing unit and a transceiver unit, wherein the processing unit is coupled to the transceiver unit to execute the method according to any one of claims 1 to 11, or execute the method according to any one of claims 12 to 17.

19. A communication device, characterized in that: The communication device includes a processor and a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the communication device performs the method as described in any one of claims 1 to 11, or the communication device performs the method as described in any one of claims 12 to 17.

20. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 11, or the computer is caused to execute the method according to any one of claims 12 to 17.

21. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is run on a computer, the computer is caused to execute the method according to any one of claims 1 to 11, or the computer is caused to execute the method according to any one of claims 12 to 17.

22. A chip system, characterized in that: The chip system comprises: A processor and an interface, wherein the processor is used to call and run instructions from the interface, and when the processor executes the instructions, the method according to any one of claims 1 to 11 is implemented, or the method according to any one of claims 12 to 17 is implemented.

Images