Communication method and device

Abstract

The invention provides a communication method and device, relates to the technical field of wireless communication, and is used for improving the access accuracy of terminal equipment and avoiding unnecessary access. In the application, a terminal device receives a first message from a first network device, the first message comprises first configuration information corresponding to a second network device, the first configuration information is associated with a first time, and the first time is a time when the network device corresponding to the first configuration information allows the terminal device to access; and the terminal device redirects to the second network device according to the first message. Based on the scheme of the invention, the access failure of the terminal equipment caused by the fact that the second network equipment does not cover the position of the terminal equipment can be avoided, so that the access accuracy of the terminal equipment is improved, and unnecessary access is avoided.

Description

Technical Field

[0001] This application relates to the field of wireless communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] With the development of information technology, more urgent requirements are put forward for the efficiency, mobility, diversity, etc. of communication. Currently, a key development focus in the field of wireless communication is global mobile communication, and an important component of global mobile communication is satellite communication. In some important fields, such as space communication, aviation communication, maritime communication, etc., satellite communication plays an irreplaceable role. Satellite communication has characteristics such as long communication distance, large coverage area, and flexible networking. It can provide services for both fixed terminals and various mobile terminals.

[0003] Satellites move at high speeds in space. Relatively speaking, the moving speed of terminal devices on the ground is slow. Therefore, in the satellite communication scenario, the impact of satellite movement on the mobility management of terminal devices needs to be considered. Exemplarily, if due to the movement of the serving satellite accessed by the terminal device, the terminal device is located at the edge of the coverage area of the serving satellite, thereby triggering a handover. However, if the current terminal device does not support handover, the serving satellite triggers the terminal device to perform a redirection operation. During redirection, the serving satellite sends a redirection message to the terminal device. The redirection message includes the frequency point information of the target satellite, and the target satellite is the next satellite predicted by the serving satellite to cover the terminal device. Based on the current redirection method, after receiving the redirection message, the terminal device releases the radio resource control (RRC) connection with the current serving satellite and accesses the target satellite. However, if the target satellite has not covered the location where the terminal device is located, it will cause the terminal device to fail to access. Summary of the Invention

[0004] This application provides a communication method and apparatus to improve the accuracy of terminal device access and avoid unnecessary access.

[0005] In a first aspect, an embodiment of this application provides a communication method. This method can be executed by a terminal device or a module (such as a chip) applied in the terminal device. Taking the terminal device executing this method as an example, this method includes: The terminal device receives a first message from a first network device. The first message includes first configuration information corresponding to a second network device. The first configuration information is associated with a first time, and the first time is the time when the network device corresponding to the first configuration information allows the terminal device to access; The terminal device redirects to the second network device according to the first message.

[0006] Through the above method, the first message received by the terminal device includes first configuration information corresponding to the second network device. The terminal device can determine the first time corresponding to the second network device according to the first configuration information, and the first time is the time when the second network device allows the terminal device to access. Based on this, the terminal device can, according to the first message, redirect to the second network device at the time when the second network device allows access, which can avoid access failure caused by the fact that the second network device has not covered the location where the terminal device is located, thereby improving the accuracy of the terminal device's access and avoiding unnecessary access.

[0007] In a possible design, the first configuration information corresponding to the second network device is used to indicate the second network device. The terminal device receives the ephemeris information of the second network device; the terminal device determines the first time corresponding to the second network device according to the ephemeris information of the second network device.

[0008] Through the above method, the first network device can indicate the second network device to the terminal device through the first message. The terminal device can accurately determine the first time when the second network device allows the terminal device to access according to the ephemeris information. Therefore, the terminal device can avoid access failure by redirecting to the second network device according to the first time corresponding to the second network device.

[0009] In a possible design, the first configuration information corresponding to the second network device is used to indicate the first time.

[0010] Through the above method, the first network device can indicate the first time when the second network device allows the terminal device to access to the terminal device through the first message. Therefore, the terminal device can avoid access failure by redirecting to the second network device according to the first time.

[0011] In a possible design, the first message includes first configuration information corresponding to multiple candidate network devices. The terminal device determines the second network device from the multiple candidate network devices.

[0012] Through the above method, the first network device can pre-configure the first configuration information corresponding to multiple candidate network devices for the terminal device through the first message. When the first network device has a sudden situation and cannot configure the configuration information of the second network device, the terminal device can select the second network device for redirection from the multiple candidate network devices, thereby realizing a quick trigger for the terminal device to perform a redirection operation.

[0013] In a possible design, the first message further includes second configuration information corresponding to each candidate network device, and the second configuration information is used to characterize the access capability of the corresponding network device. The terminal device determines the second network device from the multiple candidate network devices according to the second configuration information corresponding to each candidate network device.

[0014] Through the above method, the terminal device can determine a second network device from multiple candidate network devices according to the access capabilities of the candidate network devices. For example, the terminal device can select a candidate network device with better access capabilities as the second network device, thereby improving the performance of the terminal device after being redirected to the second network device.

[0015] In a possible design, the second configuration information includes the load information and / or priority information of the corresponding network device.

[0016] Through the above method, the terminal device can select a better candidate network device as the second network device according to the load information and / or priority information of the candidate network devices. For example, the terminal device can select a candidate network device with a smaller load or a higher priority as the second network device, thereby improving the performance of the terminal device after being redirected to the second network device.

[0017] In a possible design, the terminal device receives first indication information from a first network device, where the first indication information is used to indicate the second network device; the terminal device determines the second network device from multiple candidate network devices according to the first indication information.

[0018] Through the above method, the first network device pre-configures the first configuration information corresponding to multiple candidate network devices for the terminal device through a first message. When it is necessary to trigger the terminal device to perform a redirection operation, the first network device can directly indicate the second network device to the terminal device, thereby achieving a quick trigger for the terminal device to perform a redirection operation.

[0019] In a possible design, the terminal device determines that the first redirection trigger condition among at least one redirection trigger condition is satisfied; the terminal device determines that the candidate network device corresponding to the first redirection trigger condition among multiple candidate network devices is the second network device.

[0020] Through the above method, the first network device pre-configures the first configuration information corresponding to multiple candidate network devices for the terminal device through a first message. When the terminal device can determine that it needs to perform a redirection operation according to the preset redirection trigger conditions, the terminal device can directly be redirected to the candidate network device that currently satisfies the corresponding conditions, thereby achieving a quick trigger for the terminal device to perform a redirection operation.

[0021] In a possible design, the first configuration information further includes type indication information of the corresponding network device.

[0022] In a possible design, the terminal device determines the process of being redirected to the second network device according to the type indication information.

[0023] Through the above method, the terminal device receives the type indication information of the second network device sent by the first network device. When the terminal device performs a redirection operation, it can accurately initiate a redirection operation for the type of the second network device.

[0024] In a possible design, the first message includes the identification information of at least one terminal group, and at least one terminal group includes the terminal device.

[0025] Through the above method, the first network device can trigger a redirection operation for at least one terminal group, and implement a batch redirection indication for the terminal devices included in the terminal group.

[0026] In a second aspect, an embodiment of the present application provides a communication method, which can be executed by a terminal device or a module (such as a chip) applied to the terminal device. Taking the terminal device executing this method as an example, this method includes: the terminal device receives second indication information from the first network device, and the second indication information instructs the terminal device to perform a state switch; the terminal device switches from the current connected state to the inactive state; after the terminal device meets the start condition for state recovery, it switches from the inactive state to the connected state and accesses a third network device.

[0027] Through the above method, when the first network device is unable to provide services for the terminal device, it can instruct the terminal device to switch from the connected state to the inactive state and pause providing services for the terminal device. After the terminal device determines that it meets the start condition, it switches to the connected state and accesses the third network device, so as to avoid the terminal device initiating an access when it does not meet the access condition, resulting in an access failure.

[0028] In a possible design, the terminal device receives third indication information from the first network device, and the third indication information is used to indicate the start condition.

[0029] Through the above method, the first network device can indicate the start condition for state recovery to the terminal device, so that the terminal device can accurately perform state recovery according to this start condition.

[0030] In a possible design, the start condition includes at least one of the following: the time information for the terminal device to perform state recovery, the location information where the terminal device performs state recovery, and the signal quality of the downlink signal received by the terminal device meets a threshold.

[0031] In a possible design, the terminal device receives fourth indication information from the first network device, and the fourth indication information includes the access information of the third network device.

[0032] Through the above method, the terminal device can accurately access the third network device according to the access information of the third network device.

[0033] In a third aspect, an embodiment of the present application provides a communication method, which can be executed by a first network device or a module (such as a chip) applied in the first network device. Taking the first network device executing this method as an example, the method includes: the first network device generates a first message, where the first message includes first configuration information corresponding to a second network device, the first configuration information is associated with a first time, the first time is the time when the network device corresponding to the first configuration information allows a terminal device to access, and the second network device is the network device to which the terminal device is to be redirected; the first network device sends the first message to the terminal device.

[0034] In a possible design, the first configuration information corresponding to the second network device is used to indicate the second network device.

[0035] In a possible design, the first network device sends ephemeris information of the second network device to the terminal device; wherein, the ephemeris information of the second network device is used to determine the first time corresponding to the second network device.

[0036] In a possible design, the first configuration information corresponding to the second network device is used to indicate the first time.

[0037] In a possible design, the first message includes first configuration information corresponding to multiple candidate network devices, and the second network device is included in the multiple candidate network devices.

[0038] In a possible design, the first message further includes second configuration information corresponding to each candidate network device, and the second configuration information is used to characterize the access capability of the corresponding network device.

[0039] In a possible design, the second configuration information includes load information and / or priority information of the corresponding network device.

[0040] In a possible design, the first network device sends first indication information to the terminal, and the first indication information is used to indicate the second network device.

[0041] In a possible design, the first configuration information further includes type indication information of the corresponding network device.

[0042] In a possible design, the first message includes identification information of at least one terminal group, and the terminal device is included in the at least one terminal group.

[0043] Fourthly, an embodiment of the present application provides a communication method, which can be executed by a first network device or a module (such as a chip) applied to the first network device. Taking the first network device executing this method as an example, the method includes: the first network device generates second indication information, and the second indication information instructs the terminal device to switch from the current connected state to the inactive state; the first network device sends the second indication information to the terminal device.

[0044] In a possible design, the first network device generates third indication information, and the third indication information is used to indicate the start condition for the terminal device to perform state recovery, and the state recovery includes switching from the inactive state to the connected state; the first network device sends the third indication information to the terminal device.

[0045] In a possible design, the start condition includes at least one of the following: the time information for the terminal device to perform state recovery, the location information where the terminal device performs state recovery, and the signal quality of the downlink signal received by the terminal device meets the threshold.

[0046] In a possible design, the first network device sends fourth indication information to the terminal device, and the fourth indication information includes the access information of a third network device.

[0047] Fifthly, a communication device is provided. The communication device can be the aforementioned terminal device or the first network device. The communication device may include a communication module and a processing module to execute any one of the first to fourth aspects above, or execute any possible implementation manner of the first to fourth aspects. The communication module is used to perform transceiver operations, such as functions related to sending and receiving; the communication module can be referred to as a transceiver unit; optionally, the communication module includes a receiving module and a sending module. The processing module is used to perform processing operations.

[0048] In one design, the communication device is a communication chip, the processing module can be one or more processors or processor cores, and the communication module can be the input / output circuit, input / output interface or antenna port of the communication chip.

[0049] In another design, the communication module can be a transmitter and a receiver, or the communication module is a transmitter and a receiver.

[0050] Optionally, the communication device further includes various modules that can be used to execute any one of the first to fourth aspects above, or execute any possible implementation manner of the first to fourth aspects.

[0051] In a sixth aspect, a communication device is provided, which may be the aforementioned terminal device or the first network device. The communication device may include a processor and a memory to execute any one of the first to fourth aspects above, or execute any possible implementation manner of the first to fourth aspects. Optionally, a transceiver is further included. The memory is used to store computer programs or instructions, and the processor is used to call and run the computer programs or instructions from the memory. When the processor executes the computer programs or instructions in the memory, the communication device is caused to execute any one of the first to fourth aspects above, or execute any possible implementation manner of the first to fourth aspects.

[0052] Optionally, there is one or more processors and one or more memories.

[0053] Optionally, the memory may be integrated with the processor or separately provided from the processor.

[0054] Optionally, the transceiver may include a transmitter and a receiver.

[0055] In a seventh aspect, a communication device is provided, which may be the aforementioned terminal device or the first network device. The communication device may include a processor to execute any one of the first to fourth aspects above, or execute any possible implementation manner of the first to fourth aspects. The processor is coupled to a memory. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

[0056] In one implementation, when the communication device is a terminal device or a first network device, the communication interface may be a transceiver or an input / output interface. Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

[0057] In another implementation, when the communication device is a chip or a chip system, the communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip or the chip system. The processor may also be embodied as a processing circuit or a logic circuit.

[0058] In an eighth aspect, a computer-readable storage medium is provided, in which computer programs or instructions are stored. When the computer programs or instructions are executed by a processor, any one of the first to fourth aspects above, or any possible implementation manner thereof, is implemented.

[0059] In a ninth aspect, there is provided a computer program product storing instructions, which, when run by a processor, implement any one of the first to fourth aspects above, or any possible implementation manner thereof.

[0060] In a tenth aspect, there is provided a communication device, which includes a processor and may further include a storage medium storing instructions that, when executed by the processor, are used to implement any one of the first to fourth aspects above, or any possible implementation manner thereof. The communication device may be a chip system. The chip system may be composed of chips or may include chips and other discrete devices.

[0061] In an eleventh aspect, there is further provided a communication system, which includes the terminal device described in the first or second aspect above and the first network device described in the third or fourth aspect above.

[0062] In a twelfth aspect, the present application further provides a chip, which includes a processor. The processor is coupled to a memory and is configured to read and execute program instructions stored in the memory, so that the chip implements any one of the first to fourth aspects above, or any possible implementation manner thereof.

[0063] For each of the aspects from the third to the twelfth aspect above and the possible technical effects that each aspect may achieve, please refer to the technical effects that can be achieved by the first or second aspect above, or various possible solutions in each aspect, and details will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 FIG. is a schematic diagram of the architecture of a mobile communication system provided by an embodiment of the present application;

[0065] Figure 2 FIG. is a schematic diagram of the architecture of a non-terrestrial network communication system provided by an embodiment of the present application;

[0066] Figure 3 FIG. is a schematic diagram of the architecture of a satellite mobile communication system provided by an embodiment of the present application;

[0067] Figure 4 FIG. is a schematic diagram of the relationship between a satellite and a terminal device provided by an embodiment of the present application;

[0068] Figure 5 FIG. is a flowchart of a communication method provided by an embodiment of the present application;

[0069] Figure 6 FIG. is a flowchart of a communication method provided by an embodiment of the present application;

[0070] Figure 7Schematic structural diagram of a communication device provided by an embodiment of the present application;

[0071] Figure 8 Schematic structural diagram of a communication device provided by an embodiment of the present application. Detailed implementation manners

[0072] To more clearly describe the technical solutions of the embodiments of the present application, the communication method and device provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0073] The technology provided by the embodiments of the present application can be applied to various communication systems, such as satellite communication systems, high altitude platform (HAPS) communication systems, non-terrestrial network (NTN) systems such as unmanned aerial vehicles; for example, integrated communication and navigation (IcaN) systems, global navigation satellite systems (GNSS), and ultra-dense low-earth orbit satellite communication systems. The communication systems applied in the embodiments of the present application can be integrated with terrestrial communication systems. For example: the terrestrial communication system can be a fourth-generation (4G) communication system (e.g., long term evolution (LTE) system), worldwide interoperability for microwave access (WiMAX) communication system, fifth-generation (5G) communication system (e.g., new radio (NR) system), and sixth-generation (6G) communication system, etc.

[0074] A network element in a communication system can send a signal to another network element or receive a signal from another network element. The signal can include information, signaling, data, etc. Herein, the network element can also be replaced with an entity, network entity, device, communication device, communication module, node, communication node, etc. In the embodiments of the present application, the network element is taken as an example for description.

[0075] For example, a communication system can include at least one terminal device and at least one network device. The network device can send a downlink signal to the terminal device, and / or the terminal device can send an uplink signal to the network device. In addition, it can be understood that if the communication system includes multiple terminal devices, the multiple terminal devices can also send signals to each other, that is, both the signal sending network element and the signal receiving network element can be terminal devices.

[0076] Figure 1 shows the architecture of a mobile communication system. The communication system may include at least one network device (such as Figure 1 110a, 110b in Figure 1 ), and at least one terminal device (such as Figure 1 120a, 120b, 120c, 120d, 120e, 120f in

[0077] . It should be understood that the communication system may include more or fewer network devices or terminal devices. The network device or terminal device may be hardware, software functionally divided, or a combination of the two. For example, Figure 1 the network device 110a in may send downlink data to the terminal devices 120a, 120b, 120c, and may also receive uplink data sent by the terminal devices 120a, 120b, 120c. In addition, the terminal devices 120d, 120e, 120f may also form a communication system; for example, the terminal device 120d may send data to the terminal device 120e or the terminal device 120f. The network device and the terminal device may communicate through other devices or network elements; for example, the network device 110a may send downlink data to the terminal device 120d through the network device 110b.

[0077] The network device in the embodiments of this application is a node in a radio access network (RAN), which can also be referred to as a base station or a RAN node (or device). Currently, some examples of access network devices 101 are: evolved node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (WIFI) system, wireless relay node, wireless backhaul node, transmission point (TP) or transmission reception point (TRP), satellite, drone, etc. The network device can also be a base station (next generation NodeB, gNB) or TRP or TP in a 5G system, or one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G system. In addition, the network device can also be a network node that constitutes a gNB or TP, such as a BBU, or a distributed unit (DU), etc. Alternatively, the network device can also be a device that undertakes network-side functions in a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, the Internet of Things (IoT), a vehicle-to-everything communication system, or other communication systems. The network device can also be a next-generation base station in a sixth-generation (6G) mobile communication system or a base station in a future mobile communication system. The embodiments of this application do not limit the specific technologies and specific device forms adopted by the network device.

[0078] In another possible scenario, multiple RAN nodes cooperate to assist a terminal in achieving wireless access, and different RAN nodes respectively implement partial functions of a base station. For example, the RAN nodes can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and the DU can be separately provided, or can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as included in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0079] In different systems, the CU (or CU-CP and CU-UP), DU, or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU can also be called an open centralized unit (O-CU) or an open CU, the DU can also be called an open distributed unit (O-DU), the CU-CP can also be called an open centralized unit control plane (O-CU-CP), the CU-UP can also be called an open centralized unit user plane (O-CU-UP), and the RU can also be called an open radio unit (O-RU). For the convenience of description, in this application, the CU, CU-CP, CU-UP, DU, and RU are used as examples for description. Any one of the CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0080] The terminal device in the embodiments of the present application can also be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile phone, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc. It is a device that provides voice or data connectivity to users and can also be an Internet of Things device. For example, the terminal device includes handheld devices with wireless communication functions, in-vehicle devices, etc. Currently, the terminal device can be: mobile phone, tablet computer, laptop computer, handheld computer, mobile Internet device (MID), wearable device (such as smart watch, smart bracelet, pedometer, etc.), in-vehicle device (such as car, bicycle, electric vehicle, airplane, ship, train, high-speed rail, etc.), virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, smart home device (such as refrigerator, TV, air conditioner, electricity meter, etc.), smart robot, workshop device, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, or wireless terminal in smart home, flying device (such as smart robot, hot air balloon, drone, airplane), etc. The terminal device can also be other devices with terminal functions. For example, the terminal device can also be a device that serves as a terminal function in D2D communication.

[0081] In the embodiments of the present application, the functions of the terminal device can also be executed by modules (such as chips or modems) in the terminal device, or by devices containing the functions of the terminal device.

[0082] Based on Figure 1Description of the communication system architecture shown, taking the non-terrestrial network (NTN) communication system in the embodiments of this application as an example. NTN includes nodes such as satellite networks, high-altitude platforms, and drones, and has significant advantages such as global coverage, long-distance transmission, flexible networking, convenient deployment, and being unrestricted by geographical conditions. It has been widely used in many fields such as maritime communication, positioning and navigation, disaster relief, scientific experiments, video broadcasting, and earth observation. The ground 5G network and satellite network are integrated with each other, complementing each other's advantages, and jointly constituting a global seamless coverage integrated communication network of sea, land, air, space, and ground to meet the diverse service needs of users everywhere. In the embodiments of this application, NTN communication takes satellite communication as an example, or rather, the NTN communication system takes the satellite system as an example. As Figure 2 shown, the NTN communication system includes a satellite 201 and a terminal device 202. The explanation of the terminal device 202 can refer to the relevant description of the terminal device above. The satellite 201 can also be called a high-altitude platform, a high-altitude aircraft, or a satellite base station. Looking at the NTN communication system in connection with the terrestrial network communication system, the satellite 201 can be regarded as one or more network devices in the architecture of the terrestrial network communication system. The satellite 201 provides communication services to the terminal device 202, and the satellite 201 can also be connected to the core network device. The structure and functions of the satellite 201 can also refer to the description of the network device above. The communication method between the satellite 201 and the terminal device 202 can also refer to the Figure 1 description in the above. It will not be elaborated here. The solutions in the embodiments of this application can also be directly applied to the terrestrial communication network or applied to the terrestrial communication network after being slightly modified by methods that those skilled in the art can think of. It will not be elaborated here.

[0083] Taking the NTN communication system as a satellite mobile communication system as an example for illustration. Figure 3 This is a schematic diagram of the architecture of a satellite mobile communication system applicable to the embodiments of this application. As Figure 3 shown, this satellite mobile communication system includes: 2 terminal devices (abbreviated as terminals for short), 2 satellite base stations (such as Figure 1 the 2 5G base stations shown), a ground station, and a 5G core network. Among them, the satellite base station and the terminal device can communicate through the 5G new air interface. The two satellite base stations can communicate through the Xn interface. The satellite base station is connected to the ground station through the NG interface. The ground station is connected to the core network through the NG interface, and this NG interface can be in a wired form or a wireless form. Satellites usually can form multiple beams, and each beam is similar to a cell / sector in a terrestrial mobile communication system (such as LTE / NR).

[0084] 5G Base Station: Mainly used to provide wireless access services, schedule wireless resources to the accessed terminal devices, provide reliable wireless transmission protocols and data encryption protocols, etc.

[0085] 5G Core Network: It is mainly used to provide functions such as user access control, mobility management, session management, user security authentication, and charging. The core network consists of multiple functional units and can be divided into a control plane functional unit and a user plane processing unit. Among them, the functional units (or network elements) of the control plane include the Access and Mobility Management Function (AMF) and the Session Management Function network element (SMF). The AMF is responsible for user access management, security authentication, and mobility management. The SMF is responsible for session management of terminal devices (including establishment, modification, and release of sessions), selection and reselection of user plane functional network elements, allocation of Internet Protocol (IP) addresses for terminal devices, Quality of Service (QoS) control, selection of UPF network elements that provide packet forwarding functions, etc.

[0086] The user plane processing unit (or network element) includes: the User Plane Function (UPF) unit, and the UPF is responsible for managing functions such as the transmission of user plane data and traffic statistics.

[0087] Ground Station: It is mainly responsible for forwarding signaling and service data between the satellite and the base station, or between the satellite and the core network.

[0088] 5G New Radio: It represents the wireless link between the terminal device and the base station.

[0089] Xn Interface: It represents the interface between 5G satellite base stations, mainly used for signaling interaction such as handover.

[0090] NG Interface: It represents the interface between the 5G base station and the 5G core network, or between the ground station and the core network, or between the satellite base station and the ground station (in this case, the interface is a wireless link), mainly interacting with signaling such as the non-access stratum (NAS) of the core network, as well as the user's service data.

[0091] In the embodiments of the present application, the network devices in the terrestrial communication system and the satellites in the NTN communication system are uniformly regarded as network devices. The device for implementing the functions of the network device can be a network device; it can also be a device capable of supporting the network device to implement such functions, such as a chip system, and this device can be installed in the network device. When describing the technical solutions provided in the embodiments of the present application below, the device for implementing the functions of the network device being a satellite is taken as an example to describe the technical solutions provided in the embodiments of the present application. It can be understood that when applying the methods provided in the embodiments of the present application to the terrestrial network communication system, the actions performed by the satellite can be applied to the base station or the network device to perform.

[0092] To facilitate the understanding of the embodiments of the present application, the application scenarios of the present application will be introduced next. The application scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Those skilled in the art know that with the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

[0093] In satellite communication, the terminal device can access the satellite and receive the services provided by the satellite. Since the satellite moves at a high speed in space, in the satellite communication scenario, the movement of the satellite needs to be considered, so as to perform mobility management on the terminal device. Among them, the mobility management of the terminal device includes reselection, handover, and redirection, etc. Exemplarily, after the terminal device accesses the satellite, as the satellite moves or the satellite load increases, the signal quality of the downlink signal received by the terminal device will deteriorate, and the terminal device performs cell reselection and reselects a suitable cell to camp on according to the signal quality. The handover of the terminal device is the process in which the terminal device switches from the first satellite currently accessed to the second satellite. The redirection of the terminal device is that when the terminal device needs to switch from the first satellite to the second satellite, if the current terminal device does not support the handover (for example, due to the type of the terminal device, the second satellite cannot provide services for the terminal device), the first satellite sends a redirection message to the terminal device, and the redirection message includes the relevant information of the third satellite, instructing the terminal device to redirect to the third satellite.

[0094] Since the movement of the satellite in space is regular, the movement law of the satellite can be described by the satellite ephemeris. During redirection, the first satellite can make a prediction according to the ephemeris information of the satellite to predict the next satellite covering the location of the terminal device. For example Figure 4As shown, the terminal device A is currently connected to the first satellite. However, as the first satellite moves, when the terminal device A is at the edge of the coverage area of the first satellite, the first satellite triggers the terminal device A to perform a redirection operation. The first satellite determines, based on the ephemeris information of the satellite, that the next satellite covering the location of the terminal device is the third satellite. Then, the first satellite sends a redirection message to the terminal device, instructing the terminal device to redirect to the third satellite. However, based on the current redirection method, after receiving the redirection message, the terminal device releases the RRC connection with the first satellite and connects to the third satellite. Since the current third satellite has not yet covered the location of the terminal device, if the terminal device initiates an access to the third satellite at this time, it will result in an access failure.

[0095] Based on this, the embodiments of the present application provide a communication method and apparatus. After receiving a redirection message sent by the currently connected satellite, the terminal device determines the time to initiate the redirection operation. After the determined time arrives, the terminal device initiates the redirection operation, thereby avoiding an access failure caused by the satellite to which the redirection is made not yet covering the location of the terminal device. The following further combines Figure 5 to elaborate in detail on the communication method provided by the embodiments of the present application.

[0096] As Figure 5 shown, the embodiments of the present application provide a communication method, which may specifically include the following steps:

[0097] Step 500: The terminal device receives a first message from a first network device.

[0098] Correspondingly, the first network device generates the first message and sends the first message to the terminal device.

[0099] The first network device may be the network device to which the terminal device is currently connected (for example, the satellite currently covering the location of the terminal device, and the terminal device is connected to this satellite).

[0100] The first message includes first configuration information corresponding to a second network device. The first configuration information is associated with a first time, and the first time is the time when the network device corresponding to the first configuration information allows the terminal device to access.

[0101] The second network device is the network device to which the terminal device initiates a redirection operation to access. For example, the second network device may be the network device that covers the location of the terminal device next after the coverage area of the first network device leaves the location of the terminal device.

[0102] Exemplarily, the time when the network device allows the terminal device to access can be understood as the time when the network device covers the location where the terminal device is located. When the network device covers the location where the terminal device is located, the terminal device can access the network device, and the network device provides services for the terminal device. Among them, the first time can be a time range, such as the time range when the network device covers the location where the terminal device is located; or the first time can be a moment, such as the moment when the network device starts to cover the location where the terminal device is located, or any moment within the time range when the network device covers the location where the terminal device is located.

[0103] Step 501: The terminal device redirects to the second network device according to the first message.

[0104] After receiving the first message, the terminal device can determine the first time corresponding to the second network device according to the first configuration information included in the first message; the first time corresponding to the second network device is the time when the second network device allows the terminal device to access, so the terminal device can perform redirection based on the first time corresponding to the second network device.

[0105] In the embodiments of the present application, each network device can correspond to a first configuration information, and the first configuration information is associated with the first time corresponding to each network device. Exemplarily, the terminal device can determine the first time corresponding to each network device based on the first configuration information corresponding to each network device, where the first time corresponding to the network device is the time when the network device allows the terminal device to access.

[0106] Since the first message received by the terminal device in the embodiments of the present application includes the first configuration information corresponding to the second network device, the terminal device can determine the first time corresponding to the second network device according to the first configuration information corresponding to the second network device, and the first time corresponding to the second network device is the time when the second network device allows the terminal device to access. Based on this, the terminal device can redirect to the second network device according to the first message at the time when the second network device allows access, which can avoid access failure caused by the second network device not covering the location where the terminal device is located.

[0107] Regarding the above step 500, the first network device can send the first message to the terminal device in different situations. In different situations, the function and / or message type of the first message sent by the first network device to the terminal device can be different. The following will be described separately for different situations.

[0108] Situation 1:

[0109] When the first network device determines to trigger the terminal device to perform a redirection operation, it sends a first message to the terminal device, and the first message is used to instruct the terminal device to perform a redirection operation.

[0110] Exemplarily, the first message may be a redirection message, or may be referred to as an RRC connection release message. The first message is used to instruct the terminal device to release the RRC connection with the first network device and perform a redirection operation.

[0111] The first message may include first configuration information and configuration parameters corresponding to at least one network device; wherein, the first configuration information corresponding to the network device is associated with the first time corresponding to the network device, and the configuration parameters may include frequency point information, SMTC information, etc.

[0112] The content of the first message is introduced in detail below.

[0113] When the first message carries the first configuration information and configuration parameters corresponding to one network device, the first message may carry the first configuration information and configuration parameters corresponding to the second network device. Correspondingly, after receiving the first message, the terminal device determines the first time corresponding to the second network device according to the first configuration information corresponding to the second network device carried in the first message, and redirects to the second network device according to the first time corresponding to the second network device.

[0114] When the first message carries the first configuration information and configuration parameters corresponding to multiple network devices, the first message may carry the first configuration information and configuration parameters corresponding to multiple candidate network devices. Correspondingly, after receiving the first message, the terminal device determines the second network device from the multiple candidate network devices; then the terminal device determines the first time corresponding to the second network device according to the first configuration information corresponding to the second network device, and redirects to the second network device according to the first time corresponding to the second network device.

[0115] The following is an introduction according to different information contents carried in the first message.

[0116] 1. The first message includes the first configuration information and configuration parameters corresponding to the second network device.

[0117] When the first network device determines that the terminal device meets the redirection condition (for example, the terminal device is located at the edge of the coverage area of the first network device, or the current load of the first network device is too large), the first network device determines that the terminal device redirects to the second network device.

[0118] The first configuration information corresponding to the second network device:

[0119] A. The first configuration information can be used to indicate the second network device; exemplarily, the first configuration information is the identification information of the second network device. The terminal device can determine the first time corresponding to the second network device according to the first configuration information corresponding to the second network device.

[0120] The terminal device can determine the first time according to the following methods:

[0121] The terminal device receives the ephemeris information of the second network device, and determines the first time according to the ephemeris information of the second network device.

[0122] The terminal device can obtain the ephemeris information of the second network device from the received system message. The terminal device determines the first time according to the ephemeris information of the second network device and the location of the terminal device.

[0123] In the embodiments of the present application, the first network device can send a system message, and the system message includes the ephemeris information of multiple network devices. Correspondingly, the terminal device receives the system message from the first network device, and the terminal device obtains the ephemeris information of the second network device from the received system message according to the second network device indicated by the first configuration information (such as the identification information of the second network device).

[0124] Exemplarily, the system message sent by the first network device can be system information block 19 (SIB19), and the first network device can send SIB19 in a broadcast manner. SIB19 includes the ephemeris information of multiple network devices.

[0125] B. The first configuration information can be used to indicate the first time. After the first network device determines that the terminal device is redirected to the second network device, it can determine the time when the second network device covers the location of the terminal device as the first time according to the ephemeris information of the second network device and the location of the terminal device. Exemplarily, the first time can be the time range when the second network device covers the location of the terminal device, or the first time can be the moment in the time range when the second network device covers the location of the terminal device, such as the moment when the second network device starts to cover the location of the terminal device.

[0126] When the first configuration information is used to indicate the first time (such as the first configuration information is the first time corresponding to the second network device), the terminal device performs redirection according to the first time indicated by the first configuration information.

[0127] The configuration parameters corresponding to the second network device include but are not limited to:

[0128] Frequency point information, SMTC information.

[0129] Among them:

[0130] (1) Frequency point information: The frequency point information of the second network device can be the radio frequency of the second network device, and the terminal device can access the second network device according to the frequency point information.

[0131] (2) SMTC information: It can be used to indicate information such as the offset, period, and duration of the terminal device's measurement of the SSB, or the SMTC information may include the downlink timing of the second network device and the offset from the downlink timing of the first network device.

[0132] Optionally, the configuration parameters of the second network device may further include auxiliary information of the second network device; where the auxiliary information may include ephemeris information, synchronization parameters (such as common timing advance (TA)), and other information.

[0133] The terminal device receives the first message, determines the first time according to the first configuration information corresponding to the second network device in the first message, and redirects to the second network device according to the first time.

[0134] After the terminal device determines the first time corresponding to the second network device, it can redirect to the second network device according to the following methods:

[0135] If the first time is a time range, the terminal device can redirect to the second network device within the time range indicated by the first time; if the first time is a moment, such as the moment when the second network device starts to cover the area where the terminal device is located, the terminal device can redirect to the second network device at the moment indicated by the first time or within a certain duration after that moment.

[0136] Optionally, the first configuration information may further include type indication information of the corresponding network device. Among them, the type indication information can be used to indicate the type of the corresponding network device; exemplarily, the type of the network device can be a terrestrial network device, or a non-terrestrial network device, or a relay user equipment (UE).

[0137] Correspondingly, the terminal device can determine the process of redirecting to the second network device according to the type indication information in the first configuration information corresponding to the second network device.

[0138] Exemplarily, if the type indication information indicates that the type of the second network device is a terrestrial network or a non-terrestrial network device, the terminal device determines to initiate the establishment process of the Uu interface to the second network device; if the type indication information indicates that the type of the second network device is a relay UE, the terminal device determines to initiate the establishment process of the PC-5 interface to the second network device.

[0139] In the embodiments of the present application, the establishment process initiated by the terminal device to the second network device can be implemented based on the existing access process; for example, the establishment process initiated by the terminal device to the second network device may finally include the establishment process of the Uu interface and the establishment process of the PC-5 interface.

[0140] 2. The first message includes first configuration information and configuration parameters corresponding to multiple candidate network devices.

[0141] When the first network device determines that the terminal device meets the redirection condition (for example, the terminal device is located at the edge of the coverage area of ​​the first network device, or the current load of the first network device is too large), the first network device determines the second network device from multiple candidate network devices.

[0142] The first configuration information corresponding to the candidate network device:

[0143] A. The first configuration information may be used to indicate a candidate network device; illustratively, the first configuration information is identification information of the candidate network device. The terminal device may determine the first time corresponding to the candidate network device according to the first configuration information corresponding to the candidate network device.

[0144] Among them, the specific way in which the terminal device determines the first time corresponding to the candidate network device can refer to the way in which the terminal device determines the first time corresponding to the second network device above, and will not be repeated here.

[0145] B. The first configuration information may be used to indicate the first time. The first network device may determine the time when the candidate network device covers the location of the terminal device as the first time based on the ephemeris information of the candidate network device and the location of the terminal device. Exemplarily, the first time may be the time range when the candidate network device covers the location of the terminal device, or the first time may be a moment in the time range when the candidate network device covers the location of the terminal device, such as the moment when the candidate network device starts to cover the location of the terminal device.

[0146] Configuration parameters corresponding to candidate network devices include but are not limited to:

[0147] Frequency information, SMTC information.

[0148] in:

[0149] (1) Frequency information: The frequency information of the candidate network device may be the radio frequency of the candidate network device. The terminal device may access the candidate network device according to the frequency information.

[0150] (2) SMTC information: can be used to instruct the terminal device to measure the offset, period, duration and other information of the SSB, or the SMTC information can include the downlink timing of the candidate network device and the offset compared to the downlink timing of the first network device.

[0151] Optionally, the configuration parameters of the candidate network device may further include auxiliary information of the candidate network device; wherein the auxiliary information may include ephemeris information, synchronization parameters (such as common TA) and other information.

[0152] When the first message includes the first configuration information and configuration parameters corresponding to multiple candidate network devices, the first message may further include the second configuration information corresponding to each candidate network device.

[0153] Among them, the second configuration information corresponding to the candidate network device: can be used to characterize the access capability of the corresponding network device. Exemplarily, the second configuration information may include the load information and / or priority information of the candidate network device.

[0154] After receiving the first message, the terminal device may determine the second network device from multiple candidate network devices according to the second configuration information corresponding to each candidate network device.

[0155] Exemplarily, when the first message includes the configuration parameters of multiple candidate network devices, the terminal device may select a candidate network device with better access capability from multiple candidate network devices as the second network device to be redirected according to the second configuration information corresponding to each candidate network device.

[0156] Among them, the second configuration information includes the load information and / or priority information of the corresponding network device.

[0157] For example, when the second configuration information is load information, the terminal device may select a candidate network device with a smaller load from multiple candidate network devices as the second network device to be redirected; for another example, when the second configuration information is priority information, the terminal device may select a candidate network device with a higher priority from multiple candidate network devices as the second network device to be redirected.

[0158] After the terminal device determines the second network device from multiple candidate network devices, it may determine the first time according to the first configuration information corresponding to the second network device, and redirect to the second network device according to the first time.

[0159] It should be noted that the specific manner in which the terminal device redirects to the second network device according to the first time may refer to the introduction in the above text and will not be repeated here.

[0160] Optionally, the first configuration information corresponding to the candidate network device may further include type indication information of the candidate network device. Among them, the type indication information may be used to indicate the type of the corresponding candidate network device; Exemplarily, the type of the candidate network device may be a terrestrial network device, or a non-terrestrial network device, or a relay UE.

[0161] Correspondingly, after the terminal device determines the second network device from multiple candidate network devices, during the process of redirecting to the second network device, the terminal device may determine the process of redirecting to the second network device according to the type indication information of the second network device.

[0162] Exemplarily, if the type indication information indicates that the type of the second network device is a terrestrial network or a non-terrestrial network device, the terminal device determines to initiate the establishment process of the Uu interface with the second network device; if the type indication information indicates that the type of the second network device is a relay UE, the terminal device determines to initiate the establishment process of the PC-5 interface with the second network device.

[0163] Case 2:

[0164] During the access process of the terminal device by the first network device (or it can be said that during the process of providing services to the terminal device), the first network device pre-configures the first configuration information and configuration parameters corresponding to at least one network device for the terminal device through a first message.

[0165] Exemplarily, the first message may be an RRC reconfiguration message. The first message is used to reconfigure the terminal device.

[0166] Among them, the first configuration information corresponding to the network device is associated with the first time corresponding to the network device. The first time corresponding to the network device is the time when the corresponding network device allows the terminal device to access, or the first time corresponding to the network device can be understood as the time when the corresponding network device covers the location where the terminal device is located. The configuration parameters corresponding to the network device may include frequency point information, SMTC information, etc.

[0167] The content of the first message will be introduced in detail below.

[0168] When the first configuration information and configuration parameters corresponding to one network device are carried in the first message, the first configuration information and configuration parameters corresponding to the second network device may be carried in the first message. Correspondingly, when the terminal device performs redirection, the first time corresponding to the second network device is determined according to the first configuration information corresponding to the second network device, and the terminal device is redirected to the second network device according to the first time corresponding to the second network device.

[0169] When the first configuration information and configuration parameters corresponding to multiple network devices are carried in the first message, the first configuration information and configuration parameters corresponding to multiple candidate network devices may be carried in the first message. Correspondingly, when the terminal device performs redirection, the terminal device is redirected to the second network device among the multiple candidate network devices.

[0170] The following will be introduced separately according to different information contents carried in the first message.

[0171] 1. The first message includes the first configuration information and configuration parameters corresponding to the second network device.

[0172] During the process of the terminal device accessing the first network device, the first network device can configure the first configuration information and configuration parameters corresponding to the second network device for the terminal device through a first message; wherein, the second network device can be the network device that the first network device pre-configures for the terminal device to access when triggering redirection. Exemplarily, the second network device is the next network device covering the location of the terminal device.

[0173] Among them, the first configuration information and configuration parameters corresponding to the second network device can refer to the introduction in Scenario 1 and will not be repeated here.

[0174] After receiving the first message, the terminal device can store the first configuration information and configuration parameters corresponding to the second network device configured by the first network device through the first message.

[0175] When the first network device determines that the terminal device meets the redirection condition (for example, the terminal device is located at the edge of the coverage area of the first network device, or the current load of the first network device is too large), the first network device sends a second message to the terminal device, and the second message is used to instruct the terminal device to perform a redirection operation.

[0176] Optionally, the first network device can send the second message to the terminal device through a media access control (MAC) control element (CE) or downlink control information (DCI).

[0177] Exemplarily, the second message can be a redirection message, or can be called an RRC connection release message. The second message is used to instruct the terminal device to release the RRC connection with the first network device and perform a redirection operation.

[0178] Correspondingly, the terminal device receives the second message from the first network device, and the terminal device redirects to the second network device.

[0179] The terminal device determines the first time corresponding to the second network device according to the first configuration information corresponding to the second network device, and redirects to the second network device according to the first time corresponding to the second network device.

[0180] It should be noted that the specific manner in which the terminal device determines the first time corresponding to the second network device and redirects to the second network device according to the first time corresponding to the second network device can refer to the introduction in Scenario 1 above and will not be repeated here.

[0181] Optionally, the first configuration information may further include type indication information of the corresponding network device. The type indication information may be used to indicate the type of the corresponding network device. Exemplarily, the type of the network device may be a terrestrial network device, or a non-terrestrial network device, or a relay UE.

[0182] Correspondingly, the terminal device may determine the process of redirecting to the second network device according to the type indication information in the first configuration information corresponding to the second network device.

[0183] Exemplarily, if the type indication information indicates that the type of the second network device is a terrestrial network or a non-terrestrial network device, the terminal device determines to initiate the establishment process of the Uu interface to the second network device; if the type indication information indicates that the type of the second network device is a relay UE, the terminal device determines to initiate the establishment process of the PC-5 interface to the second network device.

[0184] 2. The first message includes the first configuration information and configuration parameters corresponding to multiple candidate network devices.

[0185] During the process of the terminal device accessing the first network device, the first network device may configure the first configuration information and configuration parameters corresponding to multiple candidate network devices for the terminal device through the first message.

[0186] The first configuration information and configuration parameters corresponding to the candidate network devices may refer to the introduction in Scenario 1 and will not be repeated here.

[0187] After receiving the first message, the terminal device may store the first configuration information and configuration parameters corresponding to multiple candidate network devices configured by the first network device through the first message.

[0188] In this case, when the first network device configures the first configuration information and configuration parameters corresponding to multiple candidate network devices for the terminal device, in the embodiments of the present application, the first network device may trigger the terminal device to perform a redirection operation, or the terminal device may trigger the execution of a redirection operation. The following will separately describe different redirection triggering methods.

[0189] Redirection Triggering Method 1: The first network device triggers the terminal device to perform a redirection operation.

[0190] When the first network device determines that the terminal device meets the redirection condition (for example, the terminal device is located at the edge of the coverage area of the first network device, or the current load of the first network device is too large), the first network device triggers the terminal device to perform a redirection operation.

[0191] A possible implementation manner is that the first network device sends a second message to the terminal device, and the second message is used to instruct the terminal device to perform a redirection operation.

[0192] The first network device may send a second message to the terminal device via MAC CE or DCI.

[0193] Exemplarily, the second message may be a redirection message, or may be referred to as an RRC connection release message. The second message is used to instruct the terminal device to release the RRC connection with the first network device and perform a redirection operation.

[0194] When the first network device determines that the terminal device meets the redirection condition, it may determine a second network device from multiple candidate network devices and send first indication information to the terminal device, where the first indication information is used to indicate the second network device. Exemplarily, the first indication information may be the identification information of the second network device.

[0195] Optionally, the first network device may carry the first indication information in the second message, or the second message and the second indication information may be sent independently.

[0196] Correspondingly, the terminal device receives the first indication information from the first network device; according to the first indication information, it determines the second network device from multiple candidate network devices.

[0197] Redirection trigger mode 2: The terminal device triggers the execution of a redirection operation.

[0198] In this redirection trigger mode, embodiments of the present application may define at least one redirection trigger condition for the terminal device to trigger a redirection operation. According to the defined at least one redirection trigger condition, when the terminal device determines that it meets one or more redirection trigger conditions, it determines to trigger a redirection operation.

[0199] Optionally, the types of redirection trigger conditions in embodiments of the present application may include: signal conditions, location conditions, and time conditions.

[0200] Exemplarily, signal conditions may include: link interruption occurs, the radio interface signal quality is poor (for example, the signal quality can be evaluated through multiple different radio interface signal quality indicators), the bit error rate is higher than the threshold, etc. For example, during the process of the terminal device accessing the first network device, if the terminal device determines that a link interruption occurs, the terminal device determines that it meets the redirection trigger condition and triggers a redirection operation; or, during the process of the terminal device accessing the first network device, if the terminal device determines that the radio interface signal quality is poor, the terminal device determines that it meets the redirection trigger condition and triggers a redirection operation.

[0201] Exemplarily, the location condition may include: the pitch angle of the terminal device relative to the first network device is less than a threshold. For example, during the process of the terminal device accessing the first network device, if the terminal device determines that the pitch angle relative to the first network device is less than the threshold, it may indicate that the terminal device is currently located at the edge position of the coverage area of the first network device. Then the terminal device determines that the redirection trigger condition is met, and the terminal device triggers a redirection operation.

[0202] Exemplarily, the time condition may include: exceeding the time range when the first network device covers the location of the terminal device. For example, during the process of the terminal device accessing the first network device, if the terminal device determines according to the time range when the first network device covers the location of the terminal device that the current time exceeds this time range, then the terminal device determines that the redirection trigger condition is met, and the terminal device triggers a redirection operation.

[0203] A possible implementation is that, when the first network device configures the first configuration information and configuration parameters corresponding to multiple candidate network devices for the terminal device through a first message, and defines multiple trigger conditions, the embodiments of the present application can establish a correspondence between the candidate network devices and the trigger conditions.

[0204] Optionally, the terminal device determines that the first redirection trigger condition among at least one redirection trigger condition is met; the terminal device determines that among multiple candidate network devices, the candidate network device corresponding to the first redirection trigger condition is the second network device.

[0205] Exemplarily, at least one redirection trigger condition includes: redirection trigger condition 1 (link interruption occurs), redirection trigger condition 2 (the radio interface signal quality is poor), redirection trigger condition 3 (the pitch angle of the terminal device relative to the first network device is less than a threshold), and multiple candidate network devices include candidate network device A, candidate network device B, and candidate network device C. And redirection trigger condition 1 corresponds to candidate network device A, redirection trigger condition 2 corresponds to candidate network device B, and redirection trigger condition 3 corresponds to candidate network device C. If the terminal device determines that redirection trigger condition 1 is currently met, then the terminal determines that candidate network device A is the second network device.

[0206] Another possible implementation is that after the terminal device determines that the first redirection trigger condition among at least one redirection trigger condition is met, it determines the second network device from multiple candidate network devices. The embodiments of the present application do not limit the specific manner in which the terminal device determines the second network device from multiple candidate network devices. For example, the terminal device may select, based on channel measurement, a candidate network device with better channel quality from multiple candidate network devices as the second network device. Another example is that the terminal device may determine, based on the ephemeris information of multiple candidate network devices, a candidate network device closer to the terminal device as the second network device.

[0207] After the terminal device determines the second network device, according to the first configuration information corresponding to the second network device, it determines the first time corresponding to the second network device, and redirects to the second network device according to the first time corresponding to the second network device.

[0208] It should be noted that for the specific manner in which the terminal device determines the first time corresponding to the second network device and redirects to the second network device according to the first time corresponding to the second network device, reference can be made to the introduction in Case 1 above, and details will not be repeated here.

[0209] Optionally, the first configuration information corresponding to the candidate network device may further include type indication information of the candidate network device. Among them, the type indication information can be used to indicate the type of the corresponding candidate network device; exemplarily, the type of the candidate network device may be a terrestrial network device, or a non-terrestrial network device, or a relay UE.

[0210] Correspondingly, after the terminal device determines the second network device according to the first indication information, during the process of redirecting to the second network device, the terminal device may determine the process of redirecting to the second network device according to the type indication information of the second network device.

[0211] Exemplarily, if the type indication information indicates that the type of the second network device is a terrestrial network or a non-terrestrial network device, the terminal device determines to initiate the establishment process of the Uu interface to the second network device; if the type indication information indicates that the type of the second network device is a relay UE, the terminal device determines to initiate the establishment process of the PC-5 interface to the second network device.

[0212] Based on the technical solution provided in Case 2, the first network device pre-configures the first configuration information and configuration parameters corresponding to at least one network device for the terminal device. In this way, when the first network device encounters a sudden situation (such as a sudden interruption of the air interface link, or a sudden sharp increase in network load), the first network device does not need to send the first configuration information and configuration parameters corresponding to at least one network device to the terminal device, and can quickly trigger the terminal device to perform a redirection operation.

[0213] Case 3:

[0214] The first network device triggers the terminal devices in the terminal group to perform a redirection operation based on the terminal group method.

[0215] In this case, the first network device groups multiple access terminal devices.

[0216] When the first network device groups multiple access terminal devices, the embodiments of the present application can achieve terminal grouping through multiple different methods:

[0217] Group implementation method 1: The first network device indicates the terminal group where each accessed terminal device is located.

[0218] The first network device divides all the accessed terminal devices into multiple groups and sends the identification information of the terminal group where each accessed terminal device is located.

[0219] Exemplarily, the first network device can send the group number of the terminal group where each accessed terminal device is located to each accessed terminal device in a unicast manner.

[0220] Group implementation method 2: The first network device groups the accessed terminal devices according to a grouping rule. Correspondingly, the terminal device determines the group it belongs to according to the same grouping rule.

[0221] In this group implementation method, the first network device and the terminal device can agree on a grouping rule. The first network device and the terminal device use the same grouping rule to determine the terminal group where the terminal device is located.

[0222] Exemplarily, the grouping rule can be a modulo operation on the identification information (ID) of the terminal device to obtain the group number of the terminal group where the terminal device is located.

[0223] When the first network device determines to perform a redirection operation on at least one terminal group, it sends a first message; the first message is used to instruct the terminal devices in the at least one terminal group to perform a redirection operation.

[0224] Among them, the first message may include the identification information of the at least one terminal group.

[0225] Optionally, the first message can be a common control signaling. Exemplarily, the first message can be an SIB message, or the first message can be a broadcast or multicast MAC CE signaling, or the first message can be a DCI scrambled with a public radio network temporary identifier (RNTI).

[0226] Exemplarily, the first network device can determine to perform a redirection operation on at least one terminal group when it determines that the feeder link (the link between the satellite and the ground station) fails.

[0227] Optionally, the first message may further include the first configuration information and configuration parameters corresponding to at least one network device; among them, the first configuration information corresponding to the network device is associated with the first time corresponding to the network device, and the configuration parameters may include frequency point information, SMTC information, etc.

[0228] In an embodiment of the present application, the first network device may determine the second network device corresponding to each terminal group to be redirected, where the second network device is the network device to which the terminal device in the corresponding terminal group is to be redirected. The first message sent by the first network device includes the first configuration information and configuration parameters corresponding to the second network device corresponding to each terminal group to be redirected.

[0229] Among them, the first configuration information and configuration parameters corresponding to the second network device may refer to the introduction in Scenario 1 and will not be repeated here.

[0230] The terminal device receives the first message. If it determines that the first message indicates its own terminal group, the terminal device determines the first time corresponding to the second network device according to the first configuration information of the second network device corresponding to its own terminal group, and redirects to the second network device according to the first time corresponding to the second network device.

[0231] Alternatively, in an embodiment of the present application, the first network device may also carry the first configuration information and configuration information corresponding to multiple candidate network devices in the first message. After receiving the first message, if the terminal device determines that the first message includes the identification information of its own terminal group, the terminal device may determine the second network device from the multiple candidate network devices.

[0232] Among them, the first configuration information and configuration parameters corresponding to the candidate network devices may refer to the introduction in Scenario 1 and will not be repeated here.

[0233] The terminal device receives the first message, determines the first time corresponding to the second network device according to the determined first configuration information of the second network device, and redirects to the second network device according to the first time corresponding to the second network device.

[0234] It should be noted that the specific manner in which the terminal device determines the first time corresponding to the second network device and redirects to the second network device according to the first time corresponding to the second network device may refer to the introduction in Scenario 1 and will not be repeated here.

[0235] An embodiment of the present application further provides a communication method and apparatus. When the first network device determines that it cannot provide services for the terminal device, it may instruct the terminal device to switch its state to the inactive state and may instruct the start condition for the terminal device to resume its state. After determining that the start condition is met, the terminal device accesses the network device, thereby avoiding unnecessary access.

[0236] As Figure 6 shown, an embodiment of the present application provides a communication method, which may specifically include the following steps:

[0237] Step 600: The terminal device receives the second indication information from the first network device.

[0238] Correspondingly, the first network device generates second indication information and sends the second indication information to the terminal device.

[0239] Wherein, the second indication information instructs the terminal device to perform a state switch.

[0240] Exemplarily, the second indication information can be used to instruct the terminal device to switch from the current connected state to the inactive state.

[0241] Step 601: The terminal device switches from the current connected state to the inactive state.

[0242] Connected state of the terminal device: When the terminal device and the access network device establish a connection, and the access network device and the core network establish a connection for this terminal device, data can be transmitted at any time. This state has no establishment delay, so the delay is the shortest.

[0243] Inactive state of the terminal device: The inactive state can also be called the deactivated state, which is a state between the connected state and the idle state. There is no connection established between the terminal device and the access network device, while the access network device and the core network establish a connection for the terminal device. Once there is data to be sent to the terminal device, the access network device will send a paging. After receiving the paging, the terminal device can quickly establish a connection with the access network device, and the terminal device can switch from the inactive state to the connected state.

[0244] Step 602: After the terminal device meets the startup condition for state recovery, the terminal device switches from the inactive state to the connected state and accesses the third network device.

[0245] Wherein, the terminal device performing state recovery can be that the terminal device switches from the inactive state to the connected state.

[0246] In the embodiments of the present application, the startup condition for the terminal device to perform state recovery can be configured in multiple ways:

[0247] Startup condition configuration method 1: The first network device configures the startup condition for the terminal device.

[0248] The first network device can send third indication information to the terminal device, and the third indication information is used to indicate the startup condition for the terminal device to perform state recovery.

[0249] In the embodiments of the present application, the first network device can send the second indication information and the third indication information through one message (or signaling). Exemplarily, the first network device sends an RRC release message to the terminal device, and the RRC release message includes the second indication information and the third indication information. Or, the first network device can send the second indication information and the third indication information through different messages (or signaling).

[0250] Startup condition configuration method 2: The terminal device pre-configures the startup condition for state recovery.

[0251] In an embodiment of the present application, the starting conditions for state recovery may be pre-configured in the terminal device; for example, the starting conditions for state recovery may be pre-stored in the terminal device.

[0252] Optionally, the start condition includes at least one of the following:

[0253] The time information of the terminal device performing status recovery, the location information of the terminal device when the status is recovered, and the signal quality of the downlink signal received by the terminal device meet the threshold.

[0254] The following are introductions to these startup conditions:

[0255] 1. Time information when the terminal device performs status recovery.

[0256] The first network device may configure time information for the terminal device to perform state recovery; illustratively, the time information may be a time range.

[0257] Correspondingly, after determining that the time corresponding to the time information has arrived, the terminal device determines that the start condition is met.

[0258] 2. The location information of the terminal device when the status is restored.

[0259] The first network device configures location information for state recovery for the terminal device; illustratively, the location information may be an area, or the location information may be a relative position relationship between the terminal device and a reference point (eg, the distance between the terminal device and the reference point is less than a threshold).

[0260] Correspondingly, if the location information is an area, the terminal device determines that the start condition is met after determining that it is located in the area. Alternatively, if the location information is that the distance between the terminal device and the reference point is less than a threshold, the terminal device determines that the start condition is met after determining that the distance between the current location and the location of the terminal device and the reference location is less than a threshold.

[0261] 3. The signal quality of the downlink signal received by the terminal device meets the threshold.

[0262] The signal quality of the downlink signal satisfies the threshold, which can be understood as the signal quality indicator (or parameter) of the downlink signal satisfies the threshold.

[0263] The first network device may configure at least one indicator or parameter representing the signal quality of the downlink signal for the terminal device, and configure the threshold corresponding to each indicator or parameter. Correspondingly, the terminal device measures the downlink signal. If the measured indicator or parameter of the signal quality meets the corresponding threshold, it is determined that the start condition is met.

[0264] After the terminal device determines that the start condition is met, it performs state recovery, switches from the inactive state to the connected state, and accesses the third network device. The third network device may be the same network device as the first network device, or the third network device may be a network device different from the first network device.

[0265] In the embodiments of the present application, the first network device may send fourth indication information to the terminal device, and the fourth indication information includes the access information of the third network device. Correspondingly, the terminal device receives the fourth indication information from the first network device.

[0266] Exemplarily, the access information of the third network device may include information such as the identification information of the third network device and the frequency point of the third network device.

[0267] After the terminal device determines that the start condition is met, it establishes a connection with the third network device.

[0268] Exemplarily, the terminal device may send an RRC Resume to the third network device; the RRC Resume may be a signaling sent when the terminal device switches from the inactive state to the connected state, and is used to request to establish a connection with the third network device.

[0269] Based on the solution provided in the embodiments of the present application, when the first network device determines that it cannot provide services for the terminal device, it may instruct the terminal device to switch from the connected state to the inactive state and suspend providing services for the terminal device. And by instructing the terminal device about the start condition for state recovery, it instructs the terminal device to switch back to the connected state when services can be provided again. The terminal device switches to the connected state and accesses the third network device after determining that the start condition is met, thereby avoiding the terminal device initiating access when the access condition is not met, resulting in access failure.

[0270] Based on the same concept, see Figure 7 , embodiments of the present application provide a communication device 700, and the communication device 700 includes a processing module 701 and a communication module 702. The communication device 700 may be a terminal device, or may be applied to a terminal device or used in cooperation with a terminal device, and can implement a communication method executed on the terminal device side; or, the communication device 700 may be a first network device, or may be applied to a first network device or used in cooperation with a first network device, and can implement a communication method executed on the first network device side.

[0271] Among them, the communication module can also be referred to as a transceiver module, transceiver, transceiver unit, or transceiver device, etc. The processing module can also be referred to as a processor, processing board, processing unit, or processing device, etc. Optionally, the communication module is used to perform the sending operation and receiving operation of the terminal device or the first network device in the above method. The device for realizing the receiving function in the communication module can be regarded as a receiving unit, and the device for realizing the sending function in the communication module can be regarded as a sending unit, that is, the communication module includes a receiving unit and a sending unit.

[0272] When the communication device 700 is applied to a terminal device, the processing module 701 can be used to implement Figure 5 or Figure 6 the processing function of the terminal device described in the embodiments shown, and the communication module 702 can be used to implement Figure 5 or Figure 6 the transceiver function of the terminal device described in the embodiments shown.

[0273] When the communication device 700 is applied to a first network device, the processing module 701 can be used to implement Figure 5 or Figure 6 the processing function of the first network device described in the embodiments shown, and the communication module 702 can be used to implement Figure 5 or Figure 6 the transceiver function of the first network device described in the embodiments shown.

[0274] In addition, it should be noted that the foregoing communication module and / or processing module can be implemented through a virtual module. For example, the processing module can be implemented through a software functional unit or a virtual device, and the communication module can be implemented through a software function or a virtual device. Alternatively, the processing module or the communication module can also be implemented through an entity device. For example, if the communication device is implemented by a chip / chip circuit, the communication module can be an input / output circuit and / or a communication interface, performing an input operation (corresponding to the foregoing receiving operation) and an output operation (corresponding to the foregoing sending operation); the processing module is an integrated processor or microprocessor or integrated circuit.

[0275] The division of modules in the embodiments of the present application is illustrative, only a logical function division. In actual implementation, there may be other division methods. In addition, in each embodiment of the embodiments of the present application, each functional module can be integrated in one processor, or can exist physically alone, or two or more modules can be integrated in one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0276] Based on the same inventive concept, an embodiment of the present application further provides a communication device 800. For example, the communication device 800 may be a chip or a chip system. Optionally, in the embodiment of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

[0277] The communication device 800 can be used to implement the functions of the terminal device or the first network device described in the foregoing embodiments. The communication device 800 may include at least one processor 810, and the processor 810 is coupled to a memory. Optionally, the memory may be located within the communication device, the memory may be integrated with the processor, or the memory may be located outside the communication device. For example, the communication device 800 may further include at least one memory 820. The memory 820 stores the necessary computer programs, computer programs or instructions and / or data in any of the above embodiments; the processor 810 may execute the computer programs stored in the memory 820 to complete the methods in any of the above embodiments.

[0278] The communication device 800 may further include a communication interface 830, and the communication device 800 can interact with other devices through the communication interface 830. Exemplarily, the communication interface 830 may be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces. When the communication device 800 is a chip-type device or circuit, the communication interface 830 in the communication device 800 may also be an input / output circuit, which can input information (or receive information) and output information (or send information), and the processor is an integrated processor, a microprocessor, an integrated circuit, or a logic circuit, and the processor can determine the output information according to the input information.

[0279] The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units, or modules, and can be in electrical, mechanical, or other forms, and is used for information interaction between devices, units, or modules. The processor 810 may cooperate with the memory 820 and the communication interface 830. In the embodiment of the present application, the specific connection medium between the above-mentioned processor 810, memory 820, and communication interface 830 is not limited.

[0280] Optionally, referring to Figure 8 , the processor 810, the memory 820, and the communication interface 830 are interconnected through a bus 840. The bus 840 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8It is represented by only one thick line, but it does not mean that there is only one bus or one type of bus.

[0281] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0282] In the embodiments of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory, such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store the 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 in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and / or data.

[0283] Wherein: the communication device 800 may be applied to a terminal device. Specifically, the communication device 800 may be a terminal device, or a device capable of supporting the terminal device to implement the functions of the terminal device in any of the above-mentioned embodiments. The memory 820 stores the computer program (or instructions) and / or data for implementing the functions of the terminal device in any of the above-mentioned embodiments. The processor 810 may execute the computer program stored in the memory 820 to complete the method executed by the terminal device in any of the above-mentioned embodiments. When applied to a terminal device, the communication interface in the communication device 800 may be used to interact with other communication devices (such as a first network device, a second network device), and send information to other communication devices or receive information from other communication devices.

[0284] Among them: The communication device 800 can be applied to a terminal device. Specifically, the communication device 800 can be a first network device or a device capable of supporting the first network device to implement the functions of the first network device in any of the above - mentioned embodiments. The memory 820 stores a computer program (or instruction) and / or data for implementing the functions of the first network device in any of the above - mentioned embodiments. The processor 810 can execute the computer program stored in the memory 820 to complete the methods executed by the first network device in any of the above - mentioned embodiments. When applied to the first network device, the communication interface in the communication device 800 can be used to interact with other communication devices (such as terminal devices), send information to other communication devices, or receive information from other communication devices.

[0285] The technical solutions provided in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, 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 processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general - purpose computer, a special - purpose computer, a computer network, a terminal device, an access network device, or other programmable devices. The computer instructions can be stored in a computer - readable storage medium or transmitted from one computer - readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer - readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that integrates one or more available media. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a digital video disc (DVD)), or a semiconductor medium, etc.

[0286] In the embodiments of the present application, on the premise of no logical contradiction, the embodiments can refer to each other. For example, the methods and / or terms between method embodiments can refer to each other. For example, the functions and / or terms between device embodiments can refer to each other. For example, the functions and / or terms between device embodiments and method embodiments can refer to each other.

[0287] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the embodiments of the present application and their equivalent technologies, the embodiments of the present application are also intended to include these changes and modifications.

Claims

1. A communication method, characterized in that, applied to a terminal device, the method includes: receiving a first message from a first network device, where the first message includes first configuration information corresponding to a second network device, the first configuration information is associated with a first time, and the first time is the time when the network device corresponding to the first configuration information allows the terminal device to access; redirecting to the second network device according to the first message.

2. The method according to claim 1, characterized in that, the first configuration information corresponding to the second network device is used to indicate the second network device, and the method further includes: receiving ephemeris information of the second network device; determining the first time corresponding to the second network device according to the ephemeris information of the second network device.

3. The method according to claim 1, characterized in that, the first configuration information corresponding to the second network device is used to indicate the first time.

4. The method according to any one of claims 1 to 3, characterized in that, the first message includes the first configuration information corresponding to multiple candidate network devices, and the method further includes: determining the second network device from the multiple candidate network devices.

5. The method according to claim 4, characterized in that, the first message further includes second configuration information corresponding to each of the candidate network devices, and the second configuration information is used to characterize the access capability of the corresponding network device; the determining the second network device from the multiple candidate network devices includes: determining the second network device from the multiple candidate network devices according to the second configuration information corresponding to each of the candidate network devices.

6. The method according to claim 4 or 5, characterized in that, the second configuration information includes load information and / or priority information of the corresponding network device.

7. The method according to claim 4, characterized in that, the determining the second network device from the multiple candidate network devices includes: receiving first indication information from the first network device, where the first indication information is used to indicate the second network device; determining the second network device from the multiple candidate network devices according to the first indication information.

8. The method according to claim 5, characterized in that, the determining the second network device from the multiple candidate network devices includes: determining to meet a first redirection trigger condition among at least one redirection trigger condition; determining that the candidate network device corresponding to the first redirection trigger condition among the multiple candidate network devices is the second network device.

9. The method according to any one of claims 1 to 8, characterized in that, the first configuration information further includes type indication information of the corresponding network device.

10. The method according to claim 9, characterized in that, the method further includes: determining a process of redirecting to the second network device according to the type indication information.

11. The method according to any one of claims 1 to 10, characterized in that, The first message includes identification information of at least one terminal group, and the at least one terminal group includes the terminal device.

12. A communication method, characterized in that, applied to a terminal device, the method includes: receiving second indication information from the first network device, the second indication information instructing the terminal device to perform a state switch; switching from the current connected state to the inactive state; after the start condition for the terminal device to perform state recovery is met, switching from the inactive state to the connected state and accessing a third network device.

13. The method according to claim 12, characterized in that, the method further includes: receiving third indication information from the first network device, the third indication information being used to indicate the start condition.

14. The method according to claim 12 or 13, characterized in that, the start condition includes at least one of the following: time information for the terminal device to perform state recovery, location information where the terminal device performs state recovery, and the signal quality of the downlink signal received by the terminal device satisfying a threshold.

15. The method according to any one of claims 12 to 14, characterized in that, the method further includes: receiving fourth indication information from the first network device, the fourth indication information including access information of the third network device.

16. A communication method, characterized in that, applied to a first network device, the method includes: generating a first message, the first message including first configuration information corresponding to a second network device, the first configuration information being associated with a first time, the first time being the time when the network device corresponding to the first configuration information allows the terminal device to access, and the second network device being the network device to which the terminal device is to be redirected; sending the first message to the terminal device.

17. The method according to claim 16, characterized in that, the first configuration information corresponding to the second network device is used to indicate the second network device.

18. The method according to claim 17, characterized in that, the method further includes: sending ephemeris information of the second network device to the terminal device.

19. The method according to claim 16, characterized in that, the first configuration information corresponding to the second network device is used to indicate the first time.

20. The method according to any one of claims 16 to 19, characterized in that, the first message includes the first configuration information corresponding to a plurality of candidate network devices, and the plurality of candidate network devices includes the second network device.

21. The method according to claim 20, characterized in that, the first message further includes second configuration information corresponding to each of the candidate network devices, the second configuration information being used to characterize the access capability of the corresponding network device.

22. The method according to claim 20, characterized in that, the method further includes: sending first indication information to the terminal, the first indication information being used to indicate the second network device.

23. The method according to any one of claims 16 to 22, characterized in that, The first configuration information further includes type indication information of the corresponding network device.

24. The method according to any one of claims 16 to 23, wherein, the first message includes identification information of at least one terminal group, and the at least one terminal group includes the terminal device.

25. A communication method, wherein, applied to a first network device, the method includes: generating second indication information for indicating the terminal device to switch from a connected state to a non-active state; sending the second indication information to the terminal device.

26. The method according to claim 25, wherein, the method further includes: generating third indication information for indicating a start condition for the terminal device to perform state recovery, where the state recovery includes switching from the non-active state to the connected state; sending the third indication information to the terminal device.

27. The method according to claim 25 or 26, wherein, the start condition includes at least one of the following: time information for the terminal device to perform state recovery, location information where the terminal device performs state recovery, and signal quality of a downlink signal received by the terminal device satisfying a threshold.

28. The method according to any one of claims 25 to 27, wherein, the method further includes: sending fourth indication information to the terminal device, where the fourth indication information includes access information of the third network device.

29. A communication device, wherein, includes a module for executing the method according to any one of claims 1 to 11, or a module for executing the method according to any one of claims 12 to 15, a module for executing the method according to any one of claims 16 to 24, and a module for executing the method according to any one of claims 25 to 28.

30. A communication device, wherein, includes: a processor, the processor is coupled to a memory, the memory is used to store computer programs or instructions, and the processor is used to execute the computer programs or instructions to implement the method according to any one of claims 1 to 11, or to implement the method according to any one of claims 12 to 15, to implement the method according to any one of claims 16 to 24, and to implement the method according to any one of claims 25 to 28.

31. A communication device, wherein, includes an interface circuit and a logic circuit; the interface circuit is used to communicate with modules outside the communication device; the logic circuit is used to execute a computer program to enable the communication device to execute the method according to any one of claims 1 to 11, or to execute the method according to any one of claims 12 to 15, or to execute the method according to any one of claims 16 to 24, or to execute the method according to any one of claims 25 to 28.

32. A communication system, wherein, A terminal device for performing the method according to any one of claims 1 to 11, 16 to 24, and a first network device for performing the method according to any one of claims 12 to 15, 16 to 24.

33. A computer-readable storage medium, characterized in that, a computer program or instruction is stored on the computer-readable storage medium, and when the instruction runs on a computer, it implements the method according to any one of claims 1 to 11, or implements the method according to any one of claims 12 to 15, or implements the method according to any one of claims 16 to 24, or implements the method according to any one of claims 25 to 28.

34. A computer program product, characterized in that, it includes a computer program, and when the computer program is executed by a communication device, it implements the method according to any one of claims 1 to 11, or when the computer program is executed by a communication device, it implements the method according to any one of claims 12 to 15, or when the computer program is executed by a communication device, it implements the method according to any one of claims 16 to 24, or when the computer program is executed by a communication device, it implements the method according to any one of claims 25 to 28.

35. A chip system, characterized in that, it includes: a processor, and the processor is used 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 15, or execute the method according to any one of claims 16 to 24, or execute the method according to any one of claims 25 to 28.

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