Communication method, communication device, and communication system

Abstract

The invention provides a communication method, a communication device and a communication system, relates to the technical field of communication, and exemplarily, the method can be applied to a cell switching scene. In the method, after receiving CHO configuration information for configuring a neighbor cell of the terminal equipment and a CHO measurement event from source access network equipment, the terminal equipment executes CHO according to the CHO configuration information under the condition that a first event and / or a second event are / is triggered. Wherein the first event comprises an event related to the increase of the angle difference of the service cell of the terminal equipment; the second event comprises an event related to the decrease of the angle difference of the neighbor cell of the terminal device. In the method, when the terminal device measures whether to trigger the CHO measurement event, the angle difference of the service cell of the terminal device and / or the angle difference of the neighbor cell of the terminal device are considered, the purpose that the terminal device switches cells in time at different altitudes is achieved, and improvement of communication quality and user experience is facilitated.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method, a communication device, and a communication system. Background Art

[0002] In wireless communication, in order to improve communication quality and ensure the normal transmission of communication data, a terminal device may select a target cell from other candidate cells except the currently camped cell (or referred to as the source cell), and switch from the source cell to the target cell. This switching process may be referred to as cell handover or handover cell.

[0003] Currently, in a non-terrestrial network (NTN) scenario, there are various conditional handover (CHO) schemes that can trigger a terminal device to perform handover between different cells. For example, handover conditions based on time, handover conditions based on location, or handover conditions based on measurement results, etc. In the NTN scenario, how to ensure the stability of the terminal device's communication during the cell handover process is still an urgent problem to be solved currently. Summary of the Invention

[0004] The present application provides a communication method, a communication device, and a communication system, which can enable a terminal device to perform CHO in a timely manner, and is beneficial to improving communication quality and user experience.

[0005] In a first aspect, a communication method is provided. This method may be executed by a terminal device, or may be executed by a component (such as a circuit, a chip, or a chip system, etc.) configured in the terminal device, or may also be implemented by a logic module or software that can implement all or part of the functions of the terminal device. The present application does not limit this. The following description is given by taking the terminal device as an example.

[0006] The method includes: after receiving CHO configuration information from a source access network device, the terminal device performs CHO when a first event and / or a second event is triggered according to the CHO configuration information. The CHO configuration information is used to configure neighbor cells of the terminal device and CHO measurement events. The CHO measurement events include a first event and / or a second event. The first event includes an event related to an increase in the angular difference between the terminal device and its serving cell. The second event is related to a decrease in the angular difference between the terminal device and its neighbor cell. The angular difference is the difference between the effective communication angle and the communication angle. The communication angle of the terminal device is the included angle between the line connecting the terminal device and an access network device and a first line. The first line is the line connecting an access network device and the center point of the communication range of an access network device. The effective communication angle is the included angle between the line connecting any point on the boundary of the communication range of an access network device and the access network device and the first line.

[0007] In this implementation manner, since the angular difference between the serving cells of the terminal devices at different altitudes and / or the angular difference between the neighboring cells of the terminal devices are not the same, when the altitude of the terminal device changes, resulting in large fluctuations in signal quality, when the terminal device measures whether to trigger a CHO measurement event, it takes into account the angular difference between the serving cell of the terminal device and / or the angular difference between the neighboring cells of the terminal device. When the terminal device determines that the angular difference of the serving cell becomes larger and / or the angular difference of the neighboring cells of the terminal device becomes smaller, it immediately triggers a cell handover, achieving the purpose of the terminal device switching cells in a timely manner at different altitudes. This not only helps to improve the accuracy of the terminal device in measuring the signal quality, but also improves the accuracy of judging cell handover, thereby facilitating the improvement of communication quality and user experience.

[0008] In a second aspect, a communication method is provided. This method can be executed, for example, by an access network device, or can also be executed by components (such as circuits, chips, or chip systems, etc.) configured in the access network device, and can also be implemented by a logic module or software that can implement all or part of the functions of the access network device. This application does not make any limitations in this regard. The following description will be given taking the access network device as an example.

[0009] The method includes: the access network device sends CHO configuration information to the terminal device. The CHO configuration information is used to configure the neighboring cells of the terminal device and the CHO measurement event. The CHO measurement event includes a first event and / or a second event; the first event includes an event related to the increase in the angular difference between the serving cell of the terminal device. The second event is an event related to the decrease in the angular difference between the neighboring cells of the terminal device; the CHO measurement event is used to determine whether to execute CHO. Among them, the angular difference is the difference between the effective communication angle and the communication angle. The communication angle of the terminal device is the included angle between the line connecting the terminal device and an access network device and the first line. The first line is the line connecting an access network device and the center point of the communication range of an access network device. The effective communication angle is the included angle between the line connecting any point on the boundary of the communication range of an access network device and an access network device and the first line.

[0010] In this implementation, since the angular difference between the serving cells of the terminal device at different altitudes and / or the angular difference between the neighboring cells of the terminal device are not the same, when the altitude of the terminal device changes, resulting in large fluctuations in signal quality, the CHO measurement event configured by the access network device in the CHO configuration information takes into account the angular difference between the serving cells of the terminal device and / or the angular difference between the neighboring cells of the terminal device, so that when the terminal device determines that the angular difference of the serving cell becomes larger and / or the angular difference of the neighboring cell of the terminal device becomes smaller, it immediately triggers a cell handover. Furthermore, the terminal device can timely hand over cells at different altitudes, avoiding the situation where the terminal device cannot timely hand over due to the change in the altitude of the terminal device, which not only helps to improve the accuracy of the terminal device in measuring the signal quality, but also improves the accuracy of judging cell handover, and thus helps to improve the communication quality and user experience.

[0011] The second aspect is the implementation on the access network device side corresponding to the first aspect. The descriptions of the explanations, supplements, and beneficial effects regarding the first aspect also apply to the second aspect and will not be elaborated here.

[0012] In a third aspect, a communication method is provided. This method can be executed, for example, by a terminal device, or by components (such as circuits, chips, or chip systems, etc.) configured in the terminal device, or can also be implemented by a logic module or software that can implement all or part of the functions of the terminal device. This application does not make any limitations in this regard. The following description is given by taking the terminal device as an example.

[0013] The method includes: after receiving the layer 1 / layer 2 triggered mobility management (LTM) configuration information from the source access network device, the terminal device sends a measurement report to the source access network device. Among them, the LTM configuration information is used to configure the measurement report and the neighboring cells of the terminal device. After receiving the handover indication from the source access network device, the terminal device performs the layer 1 / layer 2 triggered mobility management LTM, where the handover indication is used to instruct the terminal device to perform LTM, and the handover indication is sent by the source access network device to the terminal device when the LTM measurement event is triggered. The LTM measurement event includes a first event and / or a second event. The first event is related to the angular difference of the serving cell of the terminal device. The second event is related to the angular difference of the neighboring cell of the terminal device. The angular difference is the difference between the effective communication angle and the communication angle. The communication angle of the terminal device is the included angle between the connection line between the terminal device and an access network device and the first connection line. The first connection line is the connection line between an access network device and the center point of the communication range of an access network device. The effective communication angle is the included angle between the connection line between any point on the boundary of the communication range of an access network device and an access network device and the first connection line.

[0014] In this implementation, since the angular difference between the serving cells of the terminal device at different altitudes and / or the angular difference between the neighboring cells of the terminal device are not the same, when the altitude of the terminal device changes, resulting in significant signal quality fluctuations, when the access network device measures whether to trigger an LTM measurement event, it takes into account the angular difference between the serving cells of the terminal device and / or the angular difference between the neighboring cells of the terminal device, which not only improves the accuracy of the access network device in judging cell handover, but also achieves the purpose of timely cell handover of the terminal device at different altitudes, which is beneficial to improving communication quality and user experience.

[0015] In a fourth aspect, a communication method is provided. This method can be executed, for example, by an access network device, or by components (such as circuits, chips, or chip systems, etc.) configured in the access network device, or can also be implemented by a logic module or software that can implement all or part of the functions of the access network device. This application does not make any limitations in this regard. The following description is given by taking the access network device as an example.

[0016] The method includes: The access network device sends LTM configuration information to the terminal device. The LTM configuration information is used to configure the measurement report and the neighboring cells of the terminal device. After receiving the measurement report sent by the terminal device, when it is determined that the LTM measurement event is satisfied according to the measurement report, a handover indication is sent to the terminal device. Among them, the LTM measurement event includes a first event and / or a second event; the first event is related to the angular difference of the serving cell of the terminal device; the second event is related to the angular difference of the neighboring cell of the terminal device. Among them, the angular difference is the difference between the effective communication angle and the communication angle. The communication angle of the terminal device is the included angle between the connection line between the terminal device and an access network device and the first connection line. The first connection line is the connection line between an access network device and the center point of the communication range of an access network device. The effective communication angle is the included angle between the connection line between any point on the boundary of the communication range of an access network device and an access network device and the first connection line.

[0017] In this implementation, when the access network device determines whether the LTM measurement event is satisfied, it takes into account the angular difference between the serving cell of the terminal device and / or the angular difference between the neighboring cell of the terminal device, thereby achieving the purpose of timely cell handover of the terminal device at different altitudes. This not only improves the accuracy of the access network device in judging cell handover, but also avoids the situation where the terminal device cannot be switched in time due to signal quality fluctuations caused by changes in the altitude of the terminal device, which is beneficial to improving communication quality and user experience.

[0018] The fourth aspect is the implementation on the access network device side corresponding to the third aspect. The explanations, supplements, and beneficial effects described for the third aspect also apply to the fourth aspect and will not be repeated here.

[0019] In a fifth aspect, a communication device is provided, which includes a processing module and a transceiver module. The transceiver module is configured to receive CHO configuration information from a source access network device. The configuration information is used to configure neighboring cells of a terminal device and CHO measurement events.

[0020] The processing module is configured to perform CHO when a first event and / or a second event is triggered according to the CHO configuration information.

[0021] In a sixth aspect, a communication device is provided, which includes a transceiver module. The transceiver module is configured to send CHO configuration information to a terminal device. The CHO configuration information is used to configure neighboring cells of the terminal device and CHO measurement events, and the CHO measurement events include a first event and / or a second event.

[0022] The fifth and sixth aspects are device-side implementations corresponding to the first and second aspects. The explanations, supplements, and beneficial effects regarding the first and second aspects also apply to the fifth and sixth aspects and will not be elaborated here.

[0023] In a seventh aspect, a communication device is provided, which includes a processor. The processor is coupled to a memory and can be used to execute instructions or data in the memory to implement the method in any possible implementation manner of the first aspect or the third aspect. 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.

[0024] In one implementation manner, the communication interface can be a transceiver or an input / output interface.

[0025] In another implementation manner, the communication device is a chip configured in a terminal device. When the communication device is a chip configured in a terminal device, the communication interface can be an input / output interface.

[0026] In an eighth aspect, a communication device is provided, which includes a processor. The processor is coupled to a memory and can be used to execute instructions or data in the memory to implement the method in any possible implementation manner of the second aspect or the fourth aspect. 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.

[0027] In one implementation manner, the communication interface can be a transceiver or an input / output interface.

[0028] In another implementation manner, the communication device is a chip configured in an access network device. When the communication device is a chip configured in an access network device, the communication interface can be an input / output interface.

[0029] In a ninth aspect, a processor is provided, including: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit the signal through the output circuit, so that the processor executes the method in any possible implementation manner in any aspect.

[0030] In a specific implementation process, the above-mentioned processor may be one or more chips, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be transistors, gate circuits, flip-flops, and various logic circuits, etc. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver. The signal output by the output circuit may be output to, for example, but not limited to, a transmitter and transmitted by the transmitter. Moreover, the input circuit and the output circuit may be the same circuit, and this circuit serves as the input circuit and the output circuit at different times respectively. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

[0031] In a tenth aspect, a communication device is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory, and may receive a signal through a receiver and transmit a signal through a transmitter to execute the method in any possible implementation manner in any of the above aspects.

[0032] Optionally, the processor is one or more, and the memory is one or more.

[0033] In an eleventh aspect, a computer program product is provided. The computer program product includes: a computer program (which may also be referred to as code or instructions). When the computer program is run, it causes a computer to execute the method in any possible implementation manner in any of the above aspects.

[0034] In a twelfth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program (which may also be referred to as code or instructions). When it runs on a computer, it causes the computer to execute the method in any possible implementation manner in any of the above aspects.

[0035] In a thirteenth aspect, an embodiment of the present application provides a chip system. The chip system includes a memory and one or more processors, and is configured to call and run instructions stored in the memory, so that the method in any of the above aspects or any possible implementation manner of any aspect is executed. The chip system may be composed of chips, or may include chips and other discrete devices.

[0036] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0037] In a fourteenth aspect, a communication system is provided, including the foregoing terminal device and access network device. Optionally, the communication system may further include other devices that communicate with the terminal device and / or the access network device. Description of the Drawings

[0038] Figure 1 FIG. 1 is a diagram of an application scenario of the communication system provided by an embodiment of the present application; Figure 2 FIG. 2 is another diagram of an application scenario of the communication system provided by an embodiment of the present application; Figure 3 FIG. 3 is an example diagram of a communication angle and an effective communication angle provided by an embodiment of the present application; Figure 4 FIG. 4 is a diagram of a scenario of CHO handover provided by an embodiment of the present application; Figure 5 FIG. 5 is a schematic flowchart of a communication method provided by an embodiment of the present application; Figure 6 FIG. 6 is an example diagram of signaling interaction of a communication method provided by an embodiment of the present application; Figure 7 FIG. 7 is an example diagram of a ground scenario provided by an embodiment of the present application; Figure 8 FIG. 8 is a schematic block diagram of a communication device provided by an embodiment of the present application; Figure 9 FIG. 9 is another schematic block diagram of a communication device provided by an embodiment of the present application. Detailed Embodiments

[0039] Next, the technical solutions in the embodiments of the present application will be described with reference to the drawings.

[0040] The technical solution provided by this application can be applied to various communication systems, such as: Global System for Mobile Communications (GSM) system, General Packet Radio Service (GPRS), Wireless Local Area Network (WLAN), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Sidelink communication system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, Non-Terrestrial Network (NTN) communication system, 5th Generation (5G) mobile communication system or New Radio Access Technology (NR). Among them, the 5G mobile communication system can include Non-Standalone (NSA) and / or Standalone (SA). The technical solution provided by this application can also be applied to future communication systems. This application does not make any limitations in this regard.

[0041] Exemplarily, Figure 1 FIG. is an application scenario diagram of the communication system provided by an embodiment of this application. The communication method provided by an embodiment of this application can be applied to Figure 1 the communication system 100 therein. The communication system 100 may include a terminal device 110 and an access network device 120. The terminal device 110 and the access network device 120 may refer to the relevant introductions of "terminal device" and "access network device" below respectively, which will not be elaborated here.

[0042] The access network device 120 in the embodiment of this application may be a device with signal transceiver functions on various satellites in outer space. Such as Global Positioning System satellites, Beidou satellites, and call satellites of each operator, etc. Within the coverage of the access network device 120, the access network device 120 can communicate with the terminal device 110.

[0043] Figure 1Exemplarily, a terminal device 110 and an access network device 120 are shown. Optionally, the communication system 100 may further include multiple access network devices and / or multiple terminal devices.

[0044] Exemplarily, Figure 2 This is another application scenario diagram of the communication system provided by the embodiments of the present application. As Figure 2 shown, the communication system may include an access network device and a terminal device. The access network device may include a base station, an eNB, and a gNB. Hereinafter, the access network device being a gNB will be mainly used as an example. The number of access network devices may be multiple, such as gNB1 and gNB2, etc. gNB1 and gNB2 may be deployed on the same satellite or on different satellites, which is not limited herein. The number of terminal devices may also include multiple, such as UE1, UE2, UE3, UE4, UE5, UE6, and UE7, etc. Among them, UE1-UE5 are connected to gNB1, and UE6 and UE7 are connected to gNB2. Figure 2 The communication system shown also includes Cell 1, Cell 2, Cell 3, etc.

[0045] A cell, also known as a cellular cell, refers to an area covered by one access network device or a part (sector antenna) of an access network device in a cellular communication system. Within this area, a terminal device can communicate with the access network device through a wireless channel. As Figure 2 shown, the communication range covered by gNB1 includes Cell 1 and Cell 2, and the communication range covered by gNB2 includes Cell 3. Within Cell 1, UE1 and UE2 can communicate with gNB1 through a wireless channel. Within Cell 2, UE3, UE4, and UE5 can communicate with gNB1 through a wireless channel. Within Cell 3, UE6 and UE7 can communicate with gNB2 through a wireless channel.

[0046] In Figure 2 the communication system shown, the cell or access network device to which a terminal device is correspondingly connected is not fixed. The terminal device can perform a cell handover (HO) to switch to a different cell to communicate with the access network device.

[0047] The access network device in this application can be a network-side device. The access network device is sometimes also referred to as an access node. The access network device has wireless transceiver functions and is used to communicate with terminals. The access network device includes, but is not limited to, the base station (base station), evolved NodeB (eNodeB), transmission reception point (TRP) in the above communication system, the next-generation base station (nextgeneration NodeB, gNB) in the 5G mobile communication system, the access network device or module in the open RAN (ORAN) system, the satellite in the NTN communication system, the base station in the future mobile communication system, or the access node in the WiFi system, etc. The access network device can also be a module or unit capable of implementing some functions of the base station. The access network device can be a macro base station, a micro base station or an indoor station, a relay node or a donor node, or a radio controller in the cloud radio access network (CRAN) scenario. Optionally, the access network device can also be a server, a wearable device, or a vehicle-mounted device, etc. For example, the access network device in vehicle to everything (V2X) technology can be a road side unit (RSU). Multiple access network devices in the communication system can be of the same type of base station or different types of base stations. The base station can communicate with the terminal or communicate with the terminal through a relay station. The terminal can communicate with multiple base stations in different access technologies. The embodiments of this application do not limit the specific technologies and specific device forms adopted by the access network device. In this application, the access network device is also referred to as a network device. It should be understood that devices capable of implementing the functions of the access network device, such as other network devices, should all be within the protection scope of this application.

[0048] In this application, the device for implementing the functions of the network device can be the network device or a device capable of supporting the network device to implement such functions, such as a processor, a circuit, a chip, or a chip system, etc. This device can be installed in the network device or used in connection with the network device. In the technical solution provided in this application, the device for implementing the functions of the network device is taken as an example of the network device to describe the technical solution provided in this application.

[0049] The terminal device in this application can be a wireless terminal device capable of receiving satellite scheduling and indication information. The wireless terminal device can be a device that provides voice and / or data connectivity to users, or a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem. For example, the terminal device can communicate with one or more core networks or the Internet via a radio access network (RAN). The terminal device can also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. The terminal device can be widely applied to various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), ultra-reliable low-latency communication (URLLC), virtual reality, augmented reality, industrial control, autonomous driving, remote medical treatment, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, or satellite communication, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, an aircraft (such as a drone, a helicopter, an airplane), a hot air balloon, a ship, a robot, a robotic arm, or a smart home device, etc. The embodiments of this application do not limit the form of the terminal device.

[0050] In this application, the device for implementing the functions of the terminal device can be the terminal device or a device capable of supporting the terminal device to implement such functions, such as a processor, a circuit, a chip, a chip system, etc. This device can be installed in the terminal device or connected to the terminal device for use. In the technical solution provided in this application, taking the device for implementing the functions of the terminal device being the terminal device as an example, the technical solution provided in this application is described.

[0051] The access network device and / or the terminal device can be fixed or movable. The access network device and / or the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface; and can also be deployed on aircraft, balloons, and artificial satellites in the air. The embodiments of this application do not limit the application scenarios of the access network device and the terminal device. The access network device and the terminal device can be deployed in the same scenario or different scenarios. For example, the access network device is deployed on a satellite and the terminal device is deployed on land; or, the access network device and the terminal device are both deployed on land; or, the access network device is deployed on land and the terminal device is deployed on the water surface, etc., and will not be listed one by one.

[0052] In practical applications, multiple network devices can cooperate to assist a terminal in achieving wireless access, and different network devices respectively implement some functions of a base station. For example, a network device 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 set separately, 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).

[0053] In different systems, the CU (or CU-CP and CU-UP), the DU, or the RU can 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 O-CU (open CU), the DU can also be called an O-DU, the CU-CP can also be called an O-CU-CP, the CU-UP can also be called an O-CU-UP, and the RU can also be called an O-RU. Any one of the CU (or CU-CP, CU-UP), the DU, and the 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. The CU (or CU-CP and CU-UP), the DU, and the RU can implement different protocol layer functions.

[0054] To facilitate the understanding of the embodiments of this application, the terms involved in this application are briefly described first. Optionally, the explanations of some terms can also refer to the explanations in the 3rd generation partnership project (3GPP) standard protocol.

[0055] 1. Event: Used to trigger a terminal device to perform measurement reporting or cell handover, that is, in response to the occurrence / triggering of this event, the terminal device performs measurement reporting or cell handover. The event can include at least one of the following: A1 event, A2 event, A3 event, A4 event, A5 event, B1 event, and B2 event, and can also include other events, without limitation. The explanations of these several events are as follows.

[0056] The A1 event means that the signal quality of the serving cell is higher than threshold 1. Optionally, the A1 event can be used to trigger operations such as measurement reporting or cell handover. In this application, the serving cell is the cell where the terminal device currently camps or the cell that currently provides network services to the terminal device.

[0057] The A2 event means that the signal quality of the serving cell is lower than threshold 2. Optionally, usually after the A2 event occurs, operations such as cell handover may occur.

[0058] The A3 event means that the signal quality of a same-frequency / different-frequency neighboring cell is higher than that of the serving cell by an offset 1. Optionally, the A3 event can be used to determine whether the terminal device switches to the neighboring cell. In this application, the neighboring cell is the cell that takes over the serving cell to perform network services for the terminal device. The neighboring cell can be alternatively described as a neighboring cell or a candidate cell or other names, without limitation.

[0059] The A4 event means that the signal quality of the neighboring cell is higher than threshold 3. Optionally, the A4 event is used to trigger operations such as measurement reporting or cell handover.

[0060] The A5 event means that the signal quality of the serving cell is lower than a threshold 4, and the signal quality of the neighboring cell is higher than a threshold 5. The signal quality of the serving cell of the terminal device decreases, and the signal quality of the neighboring cell improves. The A5 event is used to trigger measurement reporting or cell handover.

[0061] The B1 event means that the quality of a different-system neighboring cell is higher than a preset threshold. The B1 event has nothing to do with the signal quality of the serving cell and only depends on the signal strength of the different-system neighboring cell. Among them, the different-system neighboring cell refers to a neighboring cell that belongs to a different radio access technology from the current serving cell. For example, the radio access technology of the current serving cell of the terminal device is the fourth-generation mobile communication technology (4 th generation, 4G), and the radio access technology of the neighboring cell is the third-generation mobile communication technology (3 th generation, 3G). The same-system neighboring cell refers to a situation where the current serving cell and the neighboring cell belong to the same radio access technology. For example, the radio access technologies of the current serving cell and the neighboring cell are both 4G.

[0062] The B2 event means that the signal quality of the serving cell is lower than threshold 1, and the signal quality of the different-system neighboring cell is higher than threshold 2.

[0063] In the embodiments of this application, the events and the magnitudes of the respective thresholds (thresholds) involved in the above events are not limited. Measurement reporting can be triggered periodically or event-driven.

[0064] It should be understood that the technical terms in this application are only examples and not limitations. For example, as technology evolves, technical terms will also change. In the case of the same technical meaning, other technical terms should also apply to this application.

[0065] 2. Communication angle: refers to the angle between the connection line between the terminal device and the access network device and the first connection line. The first connection line is the connection line between the access network device and the center point of the communication range of the access network device. The communication range of the access network device can be the beam coverage range.

[0066] For example, Figure 3 As shown, the elliptical area is the communication range of the access network device, the first line is the line GP between the center point P of the ellipse and the access network device G, and the angle α formed by the line UG between the position U of the terminal device and the position G of the access network device and the first line GP is the communication angle.

[0067] When the terminal device has multi-antenna technology, the terminal device can measure the communication angle by round-trip time (RTT) or angle of departure (AOD), etc. The specific implementation process is existing technology and will not be repeated here.

[0068] When the terminal device does not have multi-antenna technology or angle measurement function, the terminal device can calculate the communication angle based on the three-dimensional information of the terminal device and the three-dimensional information of the access network device, wherein the three-dimensional information may include longitude coordinates, latitude coordinates and altitude.

[0069] The following takes the case where the access network device is deployed on a satellite and the longitude and latitude coordinates of the satellite as the longitude and latitude coordinates of the access network device as an example to illustrate how to calculate the communication angle based on the three-dimensional information of the terminal device and the three-dimensional information of the access network device.

[0070] The terminal device can receive the downlink signal sent by the satellite where the access network device is located. After the terminal device receives the downlink signal including the satellite ephemeris information sent by the access network device, the terminal device can obtain the satellite ephemeris information from the downlink signal. Then, the terminal device can determine the longitude and latitude coordinates of the satellite (i.e., the longitude and latitude coordinates of the access network device) based on the satellite ephemeris information.

[0071] The process by which the terminal device determines the longitude and latitude coordinates of the satellite based on the satellite's ephemeris information is as follows: In the first step, the terminal device extracts the following parameters from the satellite's ephemeris information: orbital semi-major axis, orbital eccentricity, orbital inclination, right ascension of the ascending node, argument of perigee, mean anomaly, and mean motion.

[0072] Step 2: The terminal device calculates the mean anomaly of the satellite at the current moment. Exemplarily, the terminal device can calculate the mean anomaly of the satellite at the current moment using the following formula (1).

[0073] Formula (1); Wherein, represents the current moment, represents the epoch moment, - is the time difference starting from the epoch moment and represents the mean anomaly of the satellite at the current moment , and

[0074] Step 3: The terminal device can find the true anomaly of the satellite. Exemplarily, the terminal device can use an iterative method to solve the following Kepler's equation (2) to find the true anomaly of the satellite.

[0075] Formula (2); Wherein, represents the mean anomaly of the satellite at the current moment , represents the eccentric anomaly of the satellite, and

[0076] After the terminal device determines the eccentric anomaly E, the true anomaly can be calculated through the following formula (3) .

[0077] Formula (3); Step 4: The terminal device can calculate the position of the satellite in the orbital plane. Exemplarily, the terminal device can calculate the abscissa and ordinate of the satellite in the orbital plane through the following formulas (4) and (5).

[0078] Formula (4); Formula (5); Wherein, represents the semi-major axis of the orbit, and respectively represent the abscissa and ordinate of the satellite in the orbital plane, represents the true anomaly of the satellite, and

[0079] In the fifth step, the terminal device can convert the abscissa and ordinate of the satellite in the orbital plane to the geocentric coordinate system. Exemplarily, the terminal device can use the following formula (6) to convert the coordinates of the satellite in the orbital plane to the geocentric coordinate system.

[0080] Formula (6); Then, the terminal device rotates the satellite coordinates in the geocentric coordinate system using the orbital inclination, right ascension of the ascending node, and argument of perigee to obtain the rotated geocentric coordinates.

[0081] Formula (7); Where, represents the coordinates of the satellite in the geocentric coordinate system, represents the orbital inclination, represents the right ascension of the ascending node, ω represents the argument of perigee, and are the rotation matrices about the axis and axis respectively.

[0082] In the sixth step, the terminal device can convert the coordinates of the satellite in the geocentric coordinate system to the earth-centered earth-fixed (ECEF) coordinate system. Exemplarily, the terminal device can use the following formula (8) to convert the coordinates of the satellite in the geocentric coordinate system to the coordinates in the earth-centered earth-fixed coordinate system.

[0083] Formula (8); Where, represents the angle of the earth's rotation, represents the coordinates of the satellite in the earth-centered earth-fixed coordinate system.

[0084] In the seventh step, the terminal device can convert the coordinates of the satellite in the earth-centered earth-fixed coordinate system to the longitude and latitude coordinates of the satellite. Exemplarily, the terminal device can convert the coordinates of the satellite in the earth-centered earth-fixed coordinate system to the longitude and latitude coordinates of the satellite through the following formulas (9) and (10).

[0085] Formula (9); Formula (10); Where, , is the longitude of the satellite, is the latitude of the satellite, , and represent the coordinates of the satellite in the earth-centered fixed coordinate system.

[0086] There are differences in the signal strength and signal direction of the signals sent by different access network devices. The terminal device can determine which access network device's communication range it is located in according to the signal strength and signal direction of the signal sent by the received access network device. Once the communication range of the access network device where the terminal device is located is determined, the terminal device can obtain the longitude and latitude coordinates of the center point of this communication range in the pre-stored database. In addition, the terminal device can determine the longitude coordinate, latitude coordinate, and altitude of the terminal device through a global navigation satellite system (such as the Global Positioning System, the Beidou Navigation Satellite System, etc.).

[0087] After the terminal device determines the longitude and latitude coordinates and altitude of the terminal device, the longitude and latitude coordinates and altitude of the access network device, and the longitude and latitude coordinates and altitude of the center point of the communication range, it can determine the communication angle according to the three-dimensional information of the terminal device, the three-dimensional information of the access network device, and the three-dimensional information of the center point of the communication range.

[0088] Still as Figure 3 shown, assume that the three-dimensional information coordinates of the terminal device determined by the terminal device at point U are (x_U, y_U, z_U), the three-dimensional information coordinates of the access network device at point G are (x_G, y_G, z_G), and the three-dimensional information coordinates of the center point of the communication range at point P are (x_P, y_P, z_P), where the z coordinate represents the altitude. The steps for the terminal device to calculate the communication angle according to the three-dimensional information coordinates of points U, G, and P are as follows: Step 1, the terminal device calculates two vectors, namely vector GP and vector GU.

[0089] GP = (x_P - x_G, y_P - y_G, z_P - z_G); GU = (x_U - x_G, y_U - y_G, z_U - z_G); Step 2: Calculate the dot product of vector GP and vector GU.

[0090] GP·GU = (x_P - x_G)(x_U - x_G) + (y_P - y_G)(y_U - y_G) + (z_P - z_G)(z_U - z_G); Step 3: Calculate the magnitudes of vector GP and vector GU.

[0091] ; ; Step 4: Calculate the cosine value of the angle between vector GP and vector GU.

[0092] cos(α) = (GP·GU) / (|GP| * |GU|); Step 5: Use the inverse cosine function (arccos) to calculate the included angle α, which is the communication angle.

[0093] ; 3. Effective communication angle: It refers to the included angle between the line connecting any point on the communication range boundary of the access network device and the access network device and the above first line.

[0094] Still taking Figure 3 as shown, a side GP is formed by the position G where the access network device is located and the center point P of the communication range of the access network device. Another side QG is formed by the point Q on the communication range boundary of the access network device and the position G where the access network device is located. The included angle β formed by QG and GP is the effective communication angle.

[0095] The process for the terminal device to calculate the effective communication angle based on the three-dimensional information of the access network device, the three-dimensional information of the center point of the communication range, and the three-dimensional information of any point on the communication range boundary can refer to the above process of calculating the communication angle based on the three-dimensional information of the terminal device, the three-dimensional information of the access network device, and the three-dimensional information of the center point of the communication range, which will not be elaborated here.

[0096] The terminal device can determine the signal located on the communication range boundary by measuring the received signal strength. For example, when the signal strength is lower than a certain threshold, the signal may be at the boundary of the communication range. The terminal device can measure the three-dimensional information of any point located on the communication range boundary through methods such as laser ranging and radar ranging.

[0097] 4. Handover (HO): It refers to the migration of the wireless link connection of the terminal device from the source cell to the target cell under the control of the radio access network within the communication system, and the exchange of an ongoing call or data transmission between different wireless channels of the cells to ensure the continuity of communication. The handover process involved in the terminal device's handover usually includes three stages: handover preparation, handover execution, and handover completion. The terminal device cooperates with the access network device to achieve handover. Before the terminal device switches from the source cell to the target cell, it may first determine multiple candidate cells that can be switched and select one candidate cell as the target cell from multiple candidate cells.

[0098] Cell handover can include in-station cell handover and inter-station cell handover. In-station cell handover means that the terminal device switches from one cell of an access network device to another cell of the same access network device. These two cells are within the coverage area of the same access network device and are served by the same access network device. The network connection and communication of the two cells are processed by the same access network device. Inter-station cell handover means that the terminal device switches from one cell of an access network device to another cell of another access network device.

[0099] Continue as Figure 2 shown, UE3 is within the coverage areas of Cell 2 and Cell 1, and Cell 2 and Cell 1 are within the coverage area of the same access network device gNB1. UE3 can switch from Cell 2 to Cell 1 to achieve in-station cell handover. UE5 is within the coverage areas of Cell 2 and Cell 3. The access network device corresponding to Cell 2 is gNB1, and the access network device corresponding to Cell 3 is gNB2. UE5 can switch from Cell 2 to Cell 3 to achieve inter-station cell handover. Under the current standard, cell handover technology mainly involves layer 1 / layer 2 triggered mobility management (LTM) and CHO. Among them, LTM is a cell handover triggered based on the measurement results of protocol layer 1 and protocol layer 2 and the indication of the access network device.

[0100] Conditional handover (CHO) refers to the cell handover performed by the terminal device when one or more execution conditions are met. The terminal device starts to evaluate the execution conditions after receiving the CHO configuration information and stops evaluating these execution conditions after completing a handover. The terminal device performing conditional handover means that based on the neighboring cells of multiple terminal devices configured by the network device, it measures and decides whether to perform cell handover on its own when certain execution conditions are met. The process of the terminal device performing conditional handover mainly involves two types of conditions: the triggering conditions (Leaving Conditions) of CHO and the execution conditions (Execution Conditions) of CHO. During the process of the terminal device performing conditional handover, the triggering conditions and execution conditions of CHO must be met in sequence to start performing CHO. Meeting the execution conditions of CHO can include: meeting the entry conditions of CHO and not meeting the leaving conditions of CHO.

[0101] The communication devices involved in CHO include the terminal device and the access network device gNB. The access network device is divided into the source cell gNB and the neighboring cell gNB. The neighboring cell gNB can be further divided into the target cell gNB and the access network device other than the target cell, denoted as the potential cell gNB.

[0102] It should be understood that in the embodiment of the present application, the source cell may also be referred to as a serving cell, which refers to the cell currently accessed by the terminal device or the cell accessed before switching, and the access network device corresponding to the source cell may refer to the source access network device. The target cell may be a cell accessed by the terminal device after performing a cell switching, and the access network device corresponding to the target cell may refer to the target access network device. The access network device mentioned in the present application may be a base station or a next-generation base station gNB, etc., as described above.

[0103] It should be noted that for the specific introduction of the main signaling interaction process between LTM and CHO, reference may be made to the introduction in the existing standards, which will not be repeated in the embodiments of the present application.

[0104] At present, in NTN scenarios, such as low-orbit satellite communication scenarios, when the terminal device has a certain altitude, the terminal device's geographical location may be within the communication range, but in fact, the terminal device itself is not within the communication range, resulting in the inability to communicate between the terminal device and the access network device. The traditional conditional switching solution does not judge the different communication angles caused by the different altitudes of the terminal device, resulting in untimely triggering of the conditional switching, which leads to poor communication stability.

[0105] For example, Figure 4 As shown, the geographical location of UE1 is within the communication range of gNB1, and UE1 and gNB1 can communicate normally. The geographical location of UE2 is also within the communication range of gNB1, but due to the high altitude of UE2, UE2 and gNB1 cannot communicate. The geographical location of UE3 is also within the communication range of gNB1, but due to the high altitude of UE3, UE3 and gNB1 cannot communicate. However, the existing conditional switching scheme does not take into account the altitude of the terminal device, and the terminal device cannot trigger the cell switching in time, for example, it cannot trigger UE3 to switch from gNB1 to gNB2 in time, resulting in poor communication quality.

[0106] In addition, if the pitch / elevation angle of the access network equipment is too large or too small, it may also cause poor communication stability. For example, when the pitch / elevation angle of the access network equipment is too large, the signal may be attenuated due to the obstruction of obstacles such as buildings and terrain, resulting in a decrease in communication quality. When the pitch / elevation angle of the access network equipment is too small, the signal may be interfered with due to the multipath effect, which also affects the communication quality. The existing conditional switching scheme does not take into account the situation where the pitch angle changes due to the change of the geographical location of the access network equipment, which leads to a higher frequency of cell switching.

[0107] In view of the problem that the triggering condition cannot be switched in time due to different altitudes of the terminal device, the present application provides a communication method, including that an access network device corresponding to the serving cell of the terminal device (i.e., the source access network device) sends CHO configuration information to the terminal device, where the CHO configuration information is used to configure the neighbor cells of the terminal device and CHO measurement events including a first event and / or a second event. The first event includes an event related to an increase in the angular difference from the serving cell of the terminal device, and the second event includes an event related to a decrease in the angular difference from a neighbor cell of the terminal device. After receiving the CHO configuration information, the terminal device performs CHO according to the CHO configuration information when the first event and / or the second event is triggered. Since the angular differences between the serving cell and / or neighbor cells of terminal devices at different altitudes are different, and the CHO measurement events configured by the source access network device are related to the angular differences between the serving cell or neighbor cells of the terminal device, it can be seen that the terminal device takes into account the altitude of the terminal device during the process of determining whether the CHO measurement event is triggered, realizes timely cell switching, and is beneficial to improving communication quality.

[0108] The solution provided by the present application will be described in detail below in conjunction with the corresponding flowchart. It can be understood that in the schematic flowchart provided by the present application, different devices (for example, a terminal device, an access network device) are mainly used as the execution subjects of the interaction schematic to illustrate the method, but the present application does not limit the execution subjects of the interaction schematic. For example, the devices (for example, a terminal device, an access network device) in the schematic flowchart can also be a chip, a chip system, or a processor that supports the device to implement the method, and can also be a logic module or software that can implement all or part of the functions of the device.

[0109] It is uniformly stated here that in the interaction process of the embodiments of the present application, the message or signaling interaction involved can adopt the messages or signaling in the standard, or can also be newly introduced messages or signaling, and the embodiments of the present application do not make specific limitations on this.

[0110] Figure 5 It is a schematic flowchart of a communication method provided by an embodiment of the present application. It can be understood that Figure 5 the terminal device in Figure 2 can be any terminal device in Figure 2 or can also refer to a device in the terminal device (such as a processor, a chip, or a chip system, etc.). The source access network device can be any gNB in Figure 5 or can also refer to a device in the access network device (such as a processor, a chip, or a chip system, etc.). As shown in S510, the source access network device sends CHO configuration information to the terminal device. Correspondingly, the terminal device receives the CHO configuration information, and the CHO configuration information is used to configure the neighbor cells of the terminal device and CHO measurement events.

[0111] Optionally, the terminal device may obtain the CHO configuration information sent by the source access network device when accessing the source cell, or the terminal device may also obtain the CHO configuration information sent by the source access network device when the quality of the source cell is poor and a better serving cell needs to be replaced.

[0112] The neighboring cells of the terminal device configured with the CHO configuration information are candidate cells for the terminal device to perform CHO.

[0113] The CHO measurement event configured with the CHO configuration information refers to an event that triggers the terminal device to perform CHO, which may include a first event and / or a second event.

[0114] Optionally, the first event includes an event related to an increase in the angular difference between the serving cell of the terminal device. For example, in one implementation, the first event is that the angular difference between the serving cell of the terminal device is greater than or equal to a preset threshold 1. In another implementation, the first event is that the angular difference between the serving cell of the terminal device is greater than or equal to a preset threshold 1 and lasts for a preset duration 1. For example, if the serving cell of the terminal device is cell 1, and the communication angle of the terminal device in cell 1 is greater than a preset threshold 3 and lasts for a preset duration 1, then the terminal device may be at the edge of the communication range of the source access network device, and the communication quality between the source access network devices is poor, and the terminal device triggers the first event to perform CHO.

[0115] The second event includes an event related to a decrease in the angular difference between the neighboring cell of the terminal device. For example, in one implementation, the second event is that the angular difference between the neighboring cell of the terminal device is less than or equal to a preset threshold 2. In another implementation, the second event is that the angular difference between the neighboring cell of the terminal device is less than or equal to a preset threshold 2 and lasts for a preset duration 2. For example, if the neighboring cell of the terminal device is cell 2, and the communication angle of the terminal device in the neighboring cell is less than a preset threshold 2 and lasts for a preset duration 2, then the terminal device may be within the communication range of the access network device corresponding to the neighboring cell, and the communication quality with the source access network device is poor, and the terminal device triggers to perform CHO. For example, Figure 4 UE3 in [description] is within the communication range of gNB2 and has poor communication quality with gNB1, and UE3 can trigger to perform CHO.

[0116] The specific content included in the first event and the second event, and the conditions that should be met when the first event and the second event are triggered will be described in detail later and will not be elaborated here.

[0117] The above-mentioned preset duration 1 and / or preset duration 2 may be a preset duration or a duration configured by the network side. The preset duration 1 and the preset duration 2 may be the same or different, which is not limited.

[0118] For ease of description, hereinafter, an event related to an increase in the angular difference from the serving cell of the terminal device is simply referred to as a first threshold event, and an event related to a decrease in the angular difference from the serving cell of the terminal device is simply referred to as a second threshold event. The first threshold event can be alternatively described as a first conditional event, a first measurement event, a first handover event, etc. The second threshold event can be alternatively described as a second conditional event, a second measurement event, a second handover event, etc. The names of the first threshold event and the second threshold event are not limited in the embodiments of the present application.

[0119] The above angular difference is the difference between the effective communication angle and the communication angle. The angular difference of the serving cell of the terminal device is the difference between the first effective communication angle and the communication angle of the terminal device. The first effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the serving cell (i.e., the source access network device) and the source access network device and the first line. For the definition of the communication angle of the terminal device, refer to the specific introduction in the above technical terms, which will not be elaborated here.

[0120] The angular difference of the neighboring cell of the terminal device is the difference between the second effective communication angle and the communication angle of the terminal device. The second effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the neighboring cell (also referred to as the candidate access network device) and the access network device corresponding to the neighboring cell and the first line.

[0121] Optionally, the CHO measurement event may include not only the first event and / or the second event, but also at least one of the A3 event, the A4 event, and the A5 event. For example, the CHO measurement event includes the first event, the second event, and the A3 event, or the CHO measurement event includes the first event, the A3 event, and the A5 event, etc. The specific event types included in the CHO measurement event are configured based on the CHO configuration information, and no further examples will be given in the present application. Thus, by the source access network device pre-configuring the CHO measurement event in the CHO configuration information, the terminal device evaluates whether it meets the CHO measurement event and performs CHO handover when it meets the CHO measurement event, thereby reducing the delay of handover decision-making and facilitating the improvement of conditional handover efficiency.

[0122] In the embodiments of the present application, after receiving the CHO configuration information from the source access network device, the terminal device determines whether it meets the trigger condition of CHO according to the measurement event included in the CHO configuration information. When the terminal device determines that it meets the trigger condition of CHO, it performs CHO.

[0123] In the embodiments of the present application, the source access network device and the access network device corresponding to the neighboring cell may be deployed on the same satellite, or the source access network device and the access network device corresponding to the neighboring cell may be deployed on different satellites, which is specifically determined according to the actual scenario and is not limited here.

[0124] For example, for medium-earth orbit satellites, their coverage is relatively large, and different access network devices can be deployed on the same satellite, which helps to reduce the signal transmission delay between satellites and improve communication efficiency. For low-earth orbit satellites, due to their relatively high operating speed, the coverage of a single satellite is small, and different access network devices can be deployed on different satellites to achieve global coverage through the cooperation of multiple satellites.

[0125] Optionally, the source access network device may send a radio resource control (RRC) reconfiguration message to the terminal device, and the RRC reconfiguration message includes CHO configuration information. When the terminal device receives the RRC reconfiguration message, it can obtain the CHO configuration information.

[0126] S520, when the first event and / or the second event is triggered according to the CHO configuration information, the terminal device performs CHO.

[0127] According to the CHO configuration information, when the first event and / or the second event is triggered, the terminal device executes a CHO handover scheme to hand over from the source cell to the target cell. The process of the terminal device performing CHO can refer to the above description and will not be elaborated here.

[0128] Optionally, when the CHO measurement event configured in the CHO configuration information includes the first event, the terminal device measures whether the first event is satisfied to determine whether the first event is triggered. When the terminal device determines that the first event is satisfied, that is, when the first event is triggered, the terminal device performs CHO. When the CHO measurement event configured in the CHO configuration information includes the second event, the terminal device measures whether the second event is satisfied to determine whether the second event is triggered. When the terminal device determines that the second event is satisfied, that is, when the second event is triggered, the terminal device performs CHO. When the CHO measurement event configured in the CHO configuration information includes the first event and the second event, the terminal device measures whether the first event and the second event are satisfied to determine whether the first event and the second event are triggered. When the terminal device determines that the first event and the second event are satisfied, that is, when both the first event and the second event are triggered, the terminal device performs CHO.

[0129] For example, assume that the first event is that the angular difference of the serving cell of the terminal device is greater than a preset threshold 1 and lasts for a period of time 1. When the terminal device determines that the angular difference of the serving cell satisfies being greater than the preset threshold 1 and lasts for a period of time 1, the terminal device determines that the first event is satisfied, the first event is triggered, and the terminal device performs CHO.

[0130] The terminal device uses CHO to switch cells, allowing the terminal device to trigger the handover by itself when specific conditions are met (for example, the first event and / or the second event are triggered), reducing the delay of waiting for the network handover command.

[0131] In the communication method provided by the embodiments of the present application, when the terminal device configures CHO configuration information, and the measurement events included in the CHO configuration information include the first event and / or the second event, the terminal device can perform CHO when it determines that the first event and / or the second event are triggered. Since the terminal device considers the altitude of the terminal device based on the angular difference between the serving cell or neighboring cells of the terminal device during the process of determining whether the CHO measurement event is triggered, the purpose that the terminal device can switch cells in time when the communication quality deteriorates due to the change in the altitude of the terminal device is achieved, which is beneficial to improving the communication quality.

[0132] The following details the specific content included in the first event and the triggering conditions satisfied when the first event is triggered. Specifically, the following situations are included: Situation 1: The first event includes the first threshold event.

[0133] When the terminal device determines that the entry condition of the first threshold event is met, it is considered that the entry condition of the first event is met. When the terminal device determines that the exit condition of the first threshold event is met, it is considered that the exit condition of the first event is met. If the terminal device determines that the entry condition of the first event is met and / or the exit condition of the first event is not met, the terminal device determines that the first event is met and the first event is triggered. If the terminal device determines that the entry condition of the first event is not met and / or the exit condition of the first event is met, the terminal device determines that the first event is not met and the first event is not triggered.

[0134] It should be noted that the entry condition in the present application can also be described as a triggering condition, a starting condition, a starting condition, etc., and the exit condition can also be described as a termination condition or an ending condition, etc.

[0135] In an implementation 1 in this case, the entry condition and / or the exit condition of the first threshold event are related to the first angle threshold and the first proportional parameter. The entry condition and the exit condition of the first threshold event can be as follows: The entry condition of the first threshold event may include: the difference between the angular difference of the serving cell of the terminal device and the first product value is greater than or equal to the first angle threshold.

[0136] The exit condition of the first threshold event may include: the sum of the angular difference of the serving cell of the terminal device and the first product value is less than the first angle threshold.

[0137] The first product value is the product value between the first proportional parameter and the first effective communication angle. The first effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the serving cell (i.e., the source access network device) and the access network device corresponding to the serving cell and the first line.

[0138] The above-mentioned first proportional parameter can be alternatively described as the first angle proportional parameter or the proportional parameter of the first event, etc. The first angle threshold can be alternatively described as the first threshold, the first preset threshold or the angle threshold 1, etc.

[0139] The first proportional parameter and the first angle threshold can be configured based on the source access network device. Optionally, the CHO configuration information sent by the source access network device received by the terminal device may include the first angle threshold and the first proportional parameter. It can be seen that by configuring the first angle threshold and the first proportional parameter, the source access network device enables the terminal device to directly measure whether the first event is triggered according to the first angle threshold and the first proportional parameter, and directly execute CHO when the terminal device determines that the first event is triggered, reducing the delay of waiting for the network handover command.

[0140] Exemplarily, assume that the first threshold event (Event XX1) is that the communication angle of the terminal device in the serving cell is greater than or equal to the angle threshold 2. The angle difference of the serving cell of the terminal device is Md; Md = Mv – Mr; Mv is the effective communication angle of the terminal device relative to the source access network device (i.e., the above-mentioned first effective communication angle); Mr is the communication angle of the terminal device relative to the source access network device, that is, with the source access network device as the vertex, the measurement result of the angle between the terminal device and the center of the communication range relative to the source access network device; Sca is the proportional parameter of the first event (i.e., the first proportional parameter), and this parameter is greater than 0 and less than 1; Thresh is the threshold parameter of the first event (i.e., the first angle threshold); the units of Md, Mv, Mr and Thresh are all expressed in degrees, and Sca has no unit. When the terminal device determines that the following condition XX1-1-1 is satisfied, it is considered that the entry condition of Event XX1 is satisfied. When the terminal device determines that the following condition XX1-2-1 is satisfied, it is considered that the departure condition of Event XX1 is satisfied.

[0141] Condition XX1-1-1 (i.e., the entry condition) is: Md – Sca × Mv Thresh; Condition XX1-2-1 (i.e., the departure condition) is: Md + Sca × Mv < Thresh; Assume that the serving cell of the terminal device is Cell 1, and the CHO measurement events configured by the CHO configuration information sent by the source access network device corresponding to Cell 1 received by the terminal device include a first event, a first ratio parameter, and a first angle threshold. The terminal device determines that the difference between the angle difference in Cell 1 and the first product value is greater than or equal to the first angle threshold, that is, the entry condition of the first event is satisfied. The terminal device determines that the sum of the angle difference in Cell 1 and the first product value is not less than the first angle threshold, that is, the departure condition of the first event is not satisfied. In this case, the terminal device determines that the first event is satisfied, that is, the first event is triggered, and the terminal device performs CHO.

[0142] In this implementation, during the movement of the terminal device, the first effective communication angle of the terminal device relative to the source access network device changes. When the terminal device determines whether the first event is triggered, the entry condition and / or departure condition of the first event change with the communication angle and the effective communication angle between the terminal device and the source access network device. This not only avoids the situation where the signal quality fluctuates due to the change in the altitude of the terminal device (for example, in mountainous areas) and the terminal device cannot switch in time, but also avoids the situation of frequent switching due to the change in the height of the terminal device by setting the angle threshold, thereby improving the accuracy of triggering of the terminal device and improving the communication quality and user experience.

[0143] In an implementation 2 in this case, the entry condition and / or departure condition of the first threshold event are related to a third angle threshold and a first hysteresis parameter. The entry condition and departure condition of the first threshold event can be as follows: The entry condition of the first threshold event may include: the difference between the angle difference of the serving cell of the terminal device and the first hysteresis parameter is greater than or equal to the third angle threshold.

[0144] The departure condition of the first threshold event may include: the sum of the angle difference of the serving cell of the terminal device and the first hysteresis parameter is less than the third angle threshold.

[0145] The above first hysteresis parameter can be alternatively described as the hysteresis parameter of the first event or hysteresis parameter 1, etc. The third angle threshold can be alternatively described as the third threshold, the third preset threshold, or angle threshold 3, etc.

[0146] The first hysteresis parameter and the third angle threshold can be configured based on the source access network device. That is, the CHO configuration information sent by the source access network device received by the terminal device may include the first hysteresis parameter and the third angle threshold. It can be seen that by configuring the first hysteresis parameter and the third angle threshold, the source access network device enables the terminal device to directly measure whether the first event is triggered according to the first hysteresis parameter and the third angle threshold, and directly perform CHO when the terminal device determines that the first event is triggered, reducing the delay of waiting for the network handover command.

[0147] Exemplarily, assume that the first threshold event (Event XX1) is that the communication angle of the terminal device in the serving cell is greater than or equal to the angle threshold 2. When the terminal device determines that the following condition XX1-1-2 is satisfied, it is considered that the entry condition of Event XX1 is satisfied. When the terminal device determines that the following condition XX1-2-2 is satisfied, it is considered that the departure condition of Event XX1 is satisfied.

[0148] Condition XX1-1-2 (i.e., the entry condition) is: Md – Hys Thresh; Md = Mv–Mr; Condition XX1-2-2 (i.e., the departure condition) is: Md + Hys < Thresh; Md = Mv–Mr; Among them, Md, Mv, and Mr can refer to the specific introduction in Implementation 1 in the above case, which will not be elaborated here; Hys is the hysteresis parameter of the first event; Thresh is the threshold parameter of the first event (i.e., the third angle threshold).

[0149] In this implementation, when the terminal device determines whether the first event is triggered, it takes into account the communication angle and the effective communication angle between the terminal device and the source access network device, not only avoiding the situation where the signal quality fluctuates due to the change in the altitude of the terminal device (for example, in mountainous areas) and the terminal device cannot switch in time, but also avoiding the situation of frequent switching due to the change in the height of the terminal device by setting the angle threshold, thereby improving the accuracy of the terminal device triggering the execution of CHO, improving the communication quality and the user experience.

[0150] Case 2: The first event includes any one of the A3 event, the A4 event, and the A5 event, and / or, the first threshold event.

[0151] It should be understood that the first event can be a combination of any one of the A3 event, the A4 event, and the A5 event, and the first threshold event. In this case, the terminal device's evaluation of whether the first event is triggered can include: the terminal device determines whether all types of events in the first event are satisfied. If the terminal device determines that all types of events in the first event are satisfied, then the first event is triggered. For example, assume that the first event includes the A3 event and the first threshold event. When the terminal device determines that the A3 event and the first threshold event are satisfied, the first event is triggered.

[0152] If the terminal device determines that at least one type of event in the first event is not satisfied, the first event is not triggered. For example, when the terminal device determines that only the A3 event or only the first threshold event is satisfied, the first event is not triggered. Of course, when the terminal device determines that the A3 event is not satisfied and the first threshold event is not satisfied, the first event is also not triggered.

[0153] Optionally, in this second case, the specific content included in the first event and the triggering conditions satisfied when the first event is triggered may include the following implementation manners: Implementation manner 1: The first event includes the A3 event and the first threshold event.

[0154] Optionally, the first event may refer to that the signal quality of the neighboring cell of the terminal device is higher than the signal quality of the serving cell by a predefined offset, and the communication angle of the terminal device in the serving cell is greater than or equal to an angle threshold.

[0155] In this implementation manner, the terminal device evaluating whether the first event is triggered may include: the terminal device determining whether both the A3 event and the first threshold event are satisfied. If the terminal device determines that both the A3 event and the first threshold event are satisfied, the first event is triggered. If the terminal device determines that both the A3 event and the first threshold event are not satisfied, the first event is not triggered.

[0156] Optionally, if the terminal device determines that both the entry condition of the A3 event and the entry condition of the first threshold event are satisfied, and / or, the departure condition of the A3 event that is not satisfied and the departure condition of the first threshold event are satisfied, then the terminal device determines that the first event is satisfied and the first event is triggered. If the terminal device determines that both the entry condition of the A3 event and the first threshold event are not satisfied, and / or, the departure condition of the A3 event that is satisfied or the departure condition of the first threshold event is satisfied, then the terminal device determines that the first event is not satisfied and the first event is not triggered.

[0157] When the terminal device determines that the entry condition of the A3 event and the entry condition of the first threshold event are satisfied, it is considered that the entry condition of the first event is satisfied. When the terminal device determines that the departure condition of the A3 event and / or the departure condition of the first threshold event is satisfied, it is considered that the departure condition of the first event is satisfied.

[0158] It should be understood that the first event is triggered only when the terminal device determines that the entry condition of the first event is met, and the handover preparation state ends when the departure condition of the first event is met, thereby ensuring that the signal quality of the neighboring cell is stable and significantly better than that of the serving cell, and the handover is triggered only when the communication angle of the serving cell of the terminal device is greater than an angle threshold, thereby improving the stability of the handover and avoiding the situation that the terminal device frequently switches between the serving cell and the neighboring cell due to the temporary improvement of the signal quality of the neighboring cell, thereby enhancing the communication quality and user experience.

[0159] For example, when the terminal device determines that the following conditions A3XX1-1-1 and condition A3XX1-2-1 are met, it is considered that the entry condition of the first event (Event A3XX1) is satisfied. When the terminal device determines that condition A3XX1-3-1 or condition A3XX1-4-1 is satisfied, that is, when at least one of condition A3XX1-3-1 and condition A3XX1-4-1 is satisfied, it is considered that the departure condition of Event A3XX1 is satisfied.

[0160] Condition A3XX1-1-1 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys>Mp + Ofp + Ocp +Off; Condition A3XX1-2-1 (i.e., entry condition 2) is: Md – Sca × Mv Thresh; Md = Mv–Mr; Condition A3XX1-3-1 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys<Mp + Ofp + Ocp + Off; Condition A3XX1-4-1 (i.e., departure condition 2) is: Md + Sca × Mv<Thresh; Md = Mv–Mr; Wherein, Mn is the measurement result of the neighboring cell without considering any offset; Ofn is the measurement object specific offset of the reference signal of the neighboring cell; Ocn is the cell specific offset of the neighboring cell, which is set to zero if not configured for the neighboring cell; Mp is the measurement result of the serving cell without considering any offset; Ofp is the measurement object specific offset of the serving cell; Ocp is the cell specific offset of the serving cell, which is set to zero if not configured for the serving cell; Hys is the hysteresis parameter of the A3 event; Off is the offset parameter of the A3 event; Md, Mv, Mr, Sca, and Thresh can be referred to the introduction in the above case 1 and will not be elaborated here. When Mn and Mp are the measurement results of RSRP, they are expressed in decibel milliwatt (dBm). When Mn and Mp are the measurement results of RSRQ and / or RS-SINR, they are expressed in decibel (dB). Ofn, Ocn, Hys, Ofp, Ocp, and Off are expressed in dB.

[0161] For another example, when the terminal device determines that the following conditions A3XX1-1-2 and condition A3XX1-2-2 are met, it is considered that the entry condition of the first event (Event A3XX1) is satisfied. When the terminal device determines that condition A3XX1-3-2 or condition A3XX1-4-2 is satisfied, that is, when at least one of condition A3XX1-3-2 and condition A3XX1-4-2 is satisfied, it is considered that the departure condition of Event A3XX1 is satisfied.

[0162] Condition A3XX1-1-2 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys1>Mp + Ofp + Ocp +Off; Condition A3XX1-2-2 (i.e., entry condition 2) is: Md – Hys2 Thresh; Md = Mv–Mr; Condition A3XX1-3-2 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys1<Mp + Ofp + Ocp +Off; Condition A3XX1-4-2 (i.e., departure condition 2) is: Md + Hys2<Thresh; Among them, Mn, Ofn, Ocn, Mp, Ofp, Off, and Ocp can refer to the introduction in the above example; Hys1 is the hysteresis parameter of the A3 event; Hys2 is the hysteresis parameter of the first event; Md, Mv, Mr, Sca, and Thresh can refer to the introduction in the above case 1, which will not be elaborated here.

[0163] In this implementation, when the terminal device determines whether the first event is triggered, it comprehensively considers the signal quality of the neighboring cell and the communication angle of the terminal device, avoiding the situation where the signal quality fluctuates due to the change in the altitude of the terminal device (such as in mountainous areas or high-rise building areas), and the terminal device cannot switch in time, ensuring that the terminal device switches to a neighboring cell with better signal quality, thereby improving the communication quality and user experience.

[0164] Implementation method 2: The first event includes an A4 event and a first threshold event.

[0165] Optionally, the first event may refer to that the signal quality of the neighboring cell of the terminal device is higher than the first threshold, and the communication angle of the terminal device in the serving cell is greater than or equal to the second threshold.

[0166] The above first threshold and second threshold are in the CHO configuration information configured by the source access network device and can be adjusted according to the actual application scenario to avoid frequent handovers caused by signal fluctuations or altitude fluctuations of the terminal device.

[0167] In this implementation manner, for the specific implementation of the terminal device to evaluate whether the first event is triggered, reference can be made to the case where the first event includes the A3 event and the first threshold event in the above implementation manner 1, which will not be elaborated here.

[0168] When the terminal device determines that the entry conditions of the A4 event and the entry conditions of the first threshold event are satisfied, it is considered that the entry conditions of the first event are satisfied. When the terminal device determines that the departure conditions of the A4 event and / or the departure conditions of the first threshold event are satisfied, it is considered that the departure conditions of the first event are satisfied.

[0169] For example, when the terminal device determines that the following conditions A4XX1-1-1 and condition A4XX1-2-1 are satisfied, it is considered that the entry conditions of the first event (Event A4XX1) are satisfied. When the terminal device determines that condition A4XX1-3-1 or condition A4XX1-4-1 is satisfied, that is, when at least one of condition A4XX1-3-1 and condition A4XX1-4-1 is satisfied, it is considered that the departure conditions of Event A4XX1 are satisfied.

[0170] Condition A4XX1-1-1 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys>Thresh1; Condition A4XX1-2-1 (i.e., entry condition 2) is: Md – Sca × Mv Thresh2; Md = Mv–Mr; Condition A4XX1-3-1 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys<Thresh1; Condition A4XX1-4-1 (i.e., departure condition 2) is: Md + Sca × Mv<Thresh2; Md = Mv–Mr; Among them, for the specific introduction of Mn, Ofn, Ocn, Md, Mv, Mr, and Sca, reference can be made to the above implementation manner 1, which will not be elaborated here. Hys is the hysteresis parameter of the A4 event, Off is the offset parameter of the A4 event, Thresh1 and Thresh2 are the threshold parameters of the first event, Thresh1 is the first threshold, Thresh2 is the second threshold (which can be the above first angle threshold). The unit of Thresh1 is the same as the unit of Mn, and the unit of Thresh2 is expressed in degrees.

[0171] Still taking the terminal device as the above Figure 4Taking the UE3 in as an example, UE3 determines that the signal quality of gNB2 is higher than the first threshold, and the communication angle between UE3 and gNB1 is greater than or equal to the second threshold, that is, the above conditions A4XX1-1-1 and condition A4XX1-2-1 are satisfied, and the first event is triggered.

[0172] For another example, when the terminal device determines that the following conditions A4XX1-1-2 and condition A4XX1-2-2 are satisfied, it is considered that the entry condition of the first event (Event A4XX1) is satisfied. When the terminal device determines that condition A4XX1-3-2 or condition A4XX1-4-2 is satisfied, that is, when at least one of condition A4XX1-3-2 and condition A4XX1-4-2 is satisfied, it is considered that the departure condition of Event A4XX1 is satisfied.

[0173] Condition A4XX1-1-2 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys1>Thresh1; Condition A4XX1-2-2 (i.e., entry condition 2) is: Md – Hys2 Thres,2; Md = Mv–Mr; Condition A4XX1-3-2 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys1<Thresh1; Condition A4XX1-4-2 (i.e., departure condition 2) is: Md + Hys 2<Thresh2; Md = Mv–Mr; Among them, the specific introductions of Mn, Ofn, Ocn, Hys1, Md, Hys2, Mv, and Mr can be referred to in the above implementation method 1, which will not be elaborated here. Thresh1 and Thresh2 are the threshold parameters of the first event, Thresh1 is the first threshold, and Thresh2 is the second threshold (which can be the above third angle threshold). The unit of Thresh1 is the same as that of Mn, and the unit of Thresh2 is expressed in degrees.

[0174] In this implementation method, when the terminal device determines whether the first event is triggered, it comprehensively considers the signal quality of the neighboring cell and the communication angle of the terminal device in the serving cell, which not only avoids frequent handovers caused by fluctuations in cell signals or changes in the altitude of the terminal device, but also ensures that the terminal device switches to a cell with better signal quality, thereby improving communication quality and user experience.

[0175] Implementation method three: The first event includes an A5 event and a first threshold event.

[0176] Optionally, the first event includes that the signal quality of the serving cell of the terminal device is lower than a third threshold, the signal quality of the neighboring cell is higher than a fourth threshold, and the communication angle of the terminal device in the serving cell is greater than or equal to a fifth threshold.

[0177] The above-mentioned third threshold, fourth threshold, and fifth threshold are in the CHO configuration information configured by the source access network device and can be adjusted according to the actual application scenario. Here, it is specified that the signal quality of the serving cell is lower than the third threshold and the signal quality of the neighboring cell is higher than the fourth threshold to avoid frequent handovers caused by signal fluctuations and ensure handover to a cell with better signal quality.

[0178] In this implementation manner, for the specific implementation of the terminal device to evaluate whether the first event is triggered, reference can be made to the case where the first event includes an A3 event and a first threshold event in the above implementation manner 1, which will not be elaborated here.

[0179] When the terminal device determines that the entry conditions of the A5 event and the entry conditions of the first threshold event are met, it is considered that the entry conditions of the first event are met. When the terminal device determines that the departure conditions of the A5 event and / or the departure conditions of the first threshold event are met, it is considered that the departure conditions of the first event are met.

[0180] For example, when the terminal device determines that the following conditions A5XX1-1-1, condition A5XX1-2-1, and condition A5XX1-3-1 are met, it is considered that the entry conditions of the first event (Event A5XX1) are met. When the terminal device determines that condition A5XX1-4-1 or condition A5XX1-5-1 or condition A5XX1-6-1 is met, that is, at least one of the departure conditions from departure condition 1 to departure condition 3 is met, it is considered that the departure conditions of Event A5XX1 are met.

[0181] Condition A5XX1-1-1 (i.e., entry condition 1) is: Mp + Hys < Thresh1; Condition A5XX1-2-1 (i.e., entry condition 2) is: Mn + Ofn + Ocn – Hys > Thresh2; Condition A5XX1-3-1 (i.e., entry condition 3) is: Md – Sca × Mv Thresh3; Md = Mv–Mr; Condition A5XX1-4-1 (i.e., departure condition 1) is: Mp - Hys > Thresh1; Condition A5XX1-5-1 (i.e., departure condition 2) is: Mn + Ofn + Ocn + Hys < Thresh2; Condition A5XX1-6-1 (i.e., the leaving condition 3) is: Md + Sca × Mv < Thresh3; Md = Mv – Mr; Among them, Mp, Mn, Ofn, Ocn, Md, Mv, Mr, and Sca can be referred to the descriptions in the above Implementation Mode 1, which will not be elaborated here. Hys is the hysteresis parameter of Event A5, and Thresh1, Thresh2, and Thresh3 are the threshold parameters of the first event. Thresh1 is the third threshold, Thresh2 is the fourth threshold, and Thresh3 is the fifth threshold (which can be the above first angle threshold). The unit of Thresh1 is the same as that of Mp, the unit of Thresh2 is the same as that of Mn, and the unit of Thresh3 is expressed in degrees.

[0182] Still taking the terminal device as the UE3 in the above Figure 4 as an example, UE3 determines that the signal quality of gNB1 is lower than the third threshold, the signal quality of gNB1 is higher than the fourth threshold, and the communication angle of UE3 with gNB1 is greater than or equal to the fifth threshold, that is, the above Conditions A5XX1-1-1, Condition A5XX1-2-1, and Condition A5XX1-3-1 are simultaneously satisfied, and the first event is triggered, and the terminal device triggers the execution of CHO.

[0183] For another example, when the terminal device determines that the following Conditions A5XX1-1-2, Condition A5XX1-2-2, and Condition A5XX1-3-2 are satisfied, it is considered that the entry condition of the first event (Event A5XX1) is satisfied. When the terminal device determines that Condition A5XX1-4-2 or Condition A5XX1-5-2 or Condition A5XX1-6-2 is satisfied, that is, at least one of the leaving conditions from the leaving condition 1 to the leaving condition 3 is satisfied, it is considered that the leaving condition of Event A5XX1 is satisfied.

[0184] Condition A5XX1-1-2 (i.e., the entry condition 1) is: Mp + Hys1 < Thresh1; Condition A5XX1-2-2 (i.e., the entry condition 2) is: Mn + Ofn + Ocn – Hys1 > Thresh2; Condition A5XX1-3-2 (i.e., the entry condition 3) is: Md – Hys2 Thresh3; Md = Mv – Mr; Condition A5XX1-4-2 (i.e., the leaving condition 1) is: Mp – Hys1 > Thresh1; Condition A5XX1-5-2 (i.e., the leaving condition 2) is: Mn + Ofn + Ocn + Hys1 < Thresh2; Condition A5XX1-6-2 (i.e., leaving condition 3) is: Md + Hys2 < Thresh3; Md = Mv – Mr; Among them, Mp, Mn, Ofn, Ocn, Md, Mv, and Mr can be referred to the descriptions in the above-mentioned implementation manner 1, and will not be elaborated here. Hys1 is the hysteresis parameter of the A5 event, and Hys2 is the hysteresis parameter of the first event; Thresh1, Thresh2, and Thresh3 are the threshold parameters of the first event, Thresh1 is the third threshold, Thresh2 is the fourth threshold, and Thresh3 is the fifth threshold (which can be the above-mentioned third angle threshold).

[0185] In this implementation manner, when the terminal device determines whether the first event is triggered, it comprehensively considers the signal quality of the serving cell, the signal quality of the neighboring cell, and the communication angle of the terminal device in the serving cell, and decides whether to trigger the first event through multi-dimensional decision-making, ensuring the accuracy of the handover decision. By setting multiple threshold values, it not only avoids the situation of frequent handovers caused by cell signal fluctuations or changes in the altitude of the terminal device, but also ensures that the terminal device switches to a cell with better signal quality, thereby improving the communication quality and user experience.

[0186] The following details the specific content included in the second event and the triggering conditions satisfied when the second event is triggered. Specifically, it includes the following situations: The first situation: The second event includes the second threshold event.

[0187] When the terminal device determines that the entry condition of the second threshold event is satisfied, it is considered that the entry condition of the second event is satisfied. When the terminal device determines that the leaving condition of the second threshold event is satisfied, it is considered that the leaving condition of the second event is satisfied. If the terminal device determines that the second event is not satisfied, the second event is not triggered. Optionally, if the terminal device determines that the entry condition of the second event is satisfied and / or the leaving condition of the second event is not satisfied, the terminal device determines that the second event is satisfied and the second event is triggered. If the terminal device determines that the entry condition of the second event is not satisfied and / or the leaving condition of the second event is satisfied, the terminal device determines that the second event is not satisfied and the second event is not triggered.

[0188] In an implementation manner 1 of this first situation, the entry condition and / or leaving condition of the second threshold event are related to the second angle threshold and the second ratio parameter, and the entry condition and leaving condition of the second threshold event can be as follows: The entry condition of the second threshold event may include: The sum of the angle difference of the neighboring cell of the terminal device and the second product value is less than or equal to the second angle threshold.

[0189] The departure condition of the second threshold event may include: the difference between the angular difference of the neighboring cell of the terminal device and the second product value is greater than the second angle threshold.

[0190] The above-mentioned second product value may be the product value of the second proportional parameter and the second effective communication angle. The second effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the neighboring cell and the access network device corresponding to the neighboring cell and the first line.

[0191] The above-mentioned second proportional parameter can be alternatively described as the second angle proportional parameter or the proportional parameter of the second event, etc. The second angle threshold can be alternatively described as the second threshold, the second preset threshold, or the angle threshold 2, etc.

[0192] Similarly, the second proportional parameter and the second angle threshold can be configured based on the source access network device. That is to say, the CHO configuration information sent by the source access network device received by the terminal device may include the second angle threshold and the second proportional parameter. It can be seen that by configuring the second angle threshold and the second proportional parameter, the source access network device enables the terminal device to directly measure whether the second event is triggered according to the second angle threshold and the second proportional parameter, and directly execute CHO when the terminal device determines that the second event is triggered, reducing the delay of waiting for the network handover command.

[0193] For example, when the terminal device meets the following condition XX2-1, it is considered that the entry condition of the second event (Event XX2) is met. When the terminal device meets the following condition XX2-2, it is considered that the departure condition of Event XX2 is met.

[0194] Condition XX2-1 (i.e., the entry condition) is: Md + Sca × Mv Thresh; Condition XX2-2 (i.e., the departure condition) is: Md - Sca × Mv > Thresh; Wherein, Md is the angular difference of the serving cell of the terminal device; Md = Mv – Mr; Mv is the effective communication angle of the terminal device relative to the access network device corresponding to the neighboring cell (i.e., the second effective communication angle); Mr is the communication angle of the terminal device relative to the access network device corresponding to the neighboring cell, that is, with the access network device corresponding to the neighboring cell as the vertex, the measurement result of the angle between the terminal device and the center of the communication range relative to the access network device corresponding to the neighboring cell; Sca is the proportional parameter of the second event (i.e., the second proportional parameter), and this parameter is greater than 0 and less than 1; Thresh is the threshold parameter of the second event (i.e., the second angle threshold); the units of Md, Mv, Mr, and Thresh are all expressed in degrees, and Sca has no unit.

[0195] Still taking the terminal device asFigure 4 Taking the UE3 in as an example, when the communication angle between the UE3 and the gNB2 is less than the angle threshold, the first event is triggered, and the UE3 can trigger the execution of CHO.

[0196] In this implementation manner, during the movement of the terminal device, the effective communication angle of the terminal device relative to the access network device corresponding to the neighboring cell changes. When the terminal device determines whether the second event is triggered, the entry condition and the departure condition of the second event change with the communication angle and the effective communication angle between the terminal device and the access network device corresponding to the neighboring cell. This not only avoids the situation where the signal quality fluctuates due to the change in the altitude of the terminal device (for example, in mountainous areas) and the terminal device cannot perform handover in a timely manner, but also, by setting the angle threshold, avoids the situation of frequent handovers caused by the change in the height of the terminal device, thereby improving the accuracy of the terminal device triggering the execution of CHO and improving the communication quality and user experience.

[0197] In an implementation manner 2 of the first case, the entry condition and / or the departure condition of the second threshold event are related to the fourth angle threshold and the second hysteresis parameter. The entry condition and the departure condition of the second threshold event can be as follows: The entry condition of the second threshold event includes: the sum of the angle difference of the neighboring cell of the terminal device and the second hysteresis parameter is less than or equal to the fourth angle threshold.

[0198] The departure condition of the second threshold event includes: the difference between the angle difference of the neighboring cell of the terminal device and the second hysteresis parameter is greater than the fourth angle threshold.

[0199] The above-mentioned second hysteresis parameter can be alternatively described as the hysteresis parameter of the second event or hysteresis parameter 2, etc. The fourth angle threshold can be alternatively described as the fourth threshold, the fourth preset threshold, or angle threshold 4, etc.

[0200] The second hysteresis parameter and the fourth angle threshold can be configured based on the source access network device. Optionally, the CHO configuration information sent by the source access network device received by the terminal device may include the second hysteresis parameter and the fourth angle threshold.

[0201] Exemplarily, assume that the second threshold event (Event XX2) is that the communication angle of the terminal device relative to the neighboring cell is less than the angle threshold. When the terminal device determines that the following condition XX2-1-2 is satisfied, it is considered that the entry condition of Event XX2 is satisfied. When the terminal device determines that the following condition XX2-2-2 is satisfied, it is considered that the departure condition of Event XX2 is satisfied.

[0202] Condition XX2-1-2 (i.e., the entry condition) is: Md + Hys Thresh; Md = Mv – Mr; The condition XX2-2-2 (i.e., the departure condition) is: Md – Hys>Thresh; Md = Mv–Mr; Among them, for Md, Mv, and Mr, specific introductions in Implementation Mode 1 in the above Case 1 can be referred to and will not be elaborated here; Hys is the hysteresis parameter of the second event; Thresh is the threshold parameter of the second event (i.e., the fourth angle threshold).

[0203] In this implementation mode, the terminal device determines whether to trigger the second event by monitoring the communication angle with the access network device of the neighboring cell, ensuring that when the altitude of the terminal device changes, cell handover can be performed in a timely manner, which is beneficial to improving communication quality and user experience.

[0204] The second case: The second event includes any one of the A3 event, A4 event, and A5 event, and the second threshold event.

[0205] It should be understood that the second event can be any one of the A3 event, A4 event, and A5 event, combined with the second threshold event. In this case, for the terminal device to evaluate whether the second event is triggered, the specific implementation of how the terminal device evaluates whether the first event is triggered in Case 2 above can be referred to and will not be elaborated here.

[0206] Optionally, in this second case, the specific content included in the second event and the trigger conditions satisfied when the second event is triggered can include the following implementation modes: The first implementation mode: The second event includes the A3 event and the second threshold event related to the decrease in the angle difference between the terminal device and its neighboring cell.

[0207] Optionally, the second event can refer to that the signal quality of the neighboring cell of the terminal device is higher than that of the serving cell by an offset, and the communication angle of the neighboring cell of the terminal device is less than or equal to an angle threshold.

[0208] In this implementation, the terminal device's evaluation of whether the second event is triggered may include: the terminal device determines whether the A3 event and the second threshold event are both satisfied. If the terminal device determines that the A3 event and the second threshold event are both satisfied, the second event is triggered. If the terminal device determines that the A3 event and the second threshold event are not both satisfied, the second event is not triggered. Optionally, if the terminal device determines that the entry conditions of the A3 event and the second threshold event are both satisfied, and / or, the departure conditions of the A3 event and the second threshold event are not satisfied, the terminal device determines that the second event is satisfied and the second event is triggered. If the terminal device determines that the entry conditions of the A3 event and the second threshold event are not both satisfied, and / or, the departure condition of the A3 event or the departure condition of the second threshold event is satisfied, the terminal device determines that the second event is not satisfied and the second event is not triggered.

[0209] When the terminal device determines that the entry condition of the A3 event and the entry condition of the second threshold event are satisfied, it is considered that the entry condition of the second event is satisfied. When the terminal device determines that the departure condition of the A3 event and / or the departure condition of the second threshold event is satisfied, it is considered that the departure condition of the second event is satisfied.

[0210] For example, when the terminal device determines that the following conditions A3XX2-1-1 and condition A3XX2-2-1 are satisfied, it is considered that the entry condition of the second event (Event A3XX2) is satisfied. When the terminal device determines that condition A3XX2-3-1 or condition A3XX2-4-1 is satisfied, that is, when at least one of condition A3XX2-3-1 and condition A3XX2-4-1 is satisfied, it is considered that the departure condition of Event A3XX2 is satisfied.

[0211] Condition A3XX2-1-1 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys>Mp + Ofp + Ocp +Off; Condition A3XX2-2-1 (i.e., entry condition 2) is: Md + Sca × Mv Thresh; Md = Mv–Mr; Condition A3XX2-3-1 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys<Mp + Ofp + Ocp + Off; Condition A3XX2-4-1 (i.e., departure condition 2) is: Md – Sca × Mv>Thresh; Md = Mv–Mr; Among them, Mp, Mn, Ofn, Ocn, Hys, Md, Mv and Mr can refer to the introduction in the first implementation corresponding to the above first event, which will not be elaborated here. Sca is the second proportional parameter, and Thresh is the second angle threshold.

[0212] Taking the UE3 in the above-mentioned Figure 4 as an example of the terminal device, UE3 compares the signal quality of gNB2 with the signal quality of gNB1 plus an offset, determines that the signal quality of gNB2 is better, meets entry condition 1, and the communication angle between UE3 and gNB2 is greater than the set angle threshold, meeting entry condition 2. In this case, the second event is triggered, that is, the terminal device triggers the execution of CHO.

[0213] For another example, when the terminal device determines that the following conditions A3XX2-1-2 and condition A3XX2-2-2 are met, it is considered that the entry conditions for the second event (Event A3XX2) are met. When the terminal device determines that condition A3XX2-3-2 or condition A3XX2-4-2 is met, that is, when at least one of condition A3XX2-3-2 and condition A3XX2-4-2 is met, it is considered that the departure conditions for Event A3XX2 are met.

[0214] Condition A3XX2-1-2 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys1>Mp + Ofp + Ocp +Off; Condition A3XX2-2-2 (i.e., entry condition 2) is: Md + Hys2 Thresh; Md = Mv–Mr; Condition A3XX2-3-2 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys1<Mp + Ofp + Ocp +Off; Condition A3XX2-4-2 (i.e., departure condition 2) is: Md – Hys2>Thresh; Md = Mv–Mr; Among them, Mp, Mn, Ofn, Ocn, Md, Mv, and Mr can be referred to the introduction in the first implementation method corresponding to the above first event, which will not be elaborated here. Hys1 is the hysteresis parameter of the A3 event, Hy2 is the hysteresis parameter of the second event, and Thresh is the threshold parameter of the second event (i.e., the fourth angle threshold).

[0215] In this implementation method, when the terminal device determines whether the second event is triggered, it comprehensively considers the signal quality of the neighboring cell and the communication angle between the terminal device and the access network device corresponding to the neighboring cell, avoiding the situation that the signal quality fluctuates due to the change in the altitude of the terminal device and the terminal device cannot switch in time, ensuring that the terminal device switches to the cell with better signal quality, thereby improving the communication quality and user experience.

[0216] The second implementation method: The second event includes the A4 event and the second threshold event.

[0217] Optionally, the second event may indicate that the signal quality of a neighboring cell of the terminal device is higher than a sixth threshold, and the communication angle of the terminal device in the neighboring cell is less than or equal to a seventh threshold.

[0218] In this implementation manner, for the specific implementation of the terminal device to evaluate whether the second event is triggered, reference may be made to the case where the second event includes an A4 event and a second threshold event in the first implementation manner above, which will not be elaborated here.

[0219] When the terminal device determines that the entry conditions of the A4 event and the entry conditions of the second threshold event are satisfied, it is considered that the entry conditions of the second event are satisfied. When the terminal device determines that the departure conditions of the A4 event and / or the departure conditions of the second threshold event are satisfied, it is considered that the departure conditions of the second event are satisfied.

[0220] For example, when the terminal device determines that the following conditions A4XX2-1-1 and condition A4XX2-2-1 are satisfied, it is considered that the entry conditions of the second event (Event A4XX2) are satisfied. When the terminal device determines that condition A4XX2-3-1 or condition A4XX2-4-1 is satisfied, that is, when at least one of condition A4XX2-3-1 and condition A4XX2-4-1 is satisfied, it is considered that the departure conditions of Event A4XX2 are satisfied.

[0221] Condition A4XX2-1-1 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys>Thresh1; Condition A4XX2-2-1 (i.e., entry condition 2) is: Md + Sca × Mv Thresh2; Md = Mv–Mr; Condition A4XX2-3-1 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys<Thresh1; Condition A4XX2-4-1 (i.e., departure condition 2) is: Md – Sca × Mv>Thresh2; Md = Mv–Mr; Among them, the specific introductions of Mn, Ofn, Ocn, Md, Mv, Mr, and Sca can be found in the first implementation manner above, which will not be elaborated here. Hys is the hysteresis parameter of the A4 event, and Thresh1 and Thresh2 are the threshold parameters of the second event. Thresh1 is the sixth threshold, and Thresh2 is the seventh threshold (which can be the second angle threshold above). The unit of Thresh1 is the same as that of Mn, and the unit of Thresh2 is expressed in degrees.

[0222] Still taking the terminal device as the above Figure 4Taking the UE3 in as an example, UE3 determines that the signal quality of gNB2 is higher than the sixth threshold, and the communication angle of UE3 with respect to gNB2 is less than the seventh threshold, that is, the above conditions A4XX2-1-1 and condition A4XX2-2-1 are satisfied, and the second event is triggered, that is, the terminal device triggers the execution of CHO.

[0223] For another example, when the terminal device determines that the following conditions A4XX2-1-2 and condition A4XX2-2-2 are satisfied, it is considered that the entry condition of the second event (Event A4XX2) is satisfied. When the terminal device determines that condition A4XX2-3-2 or condition A4XX2-4-2 is satisfied, that is, when at least one of condition A4XX2-3-2 and condition A4XX2-4-2 is satisfied, it is considered that the departure condition of Event A4XX2 is satisfied.

[0224] Condition A4XX2-1-2 (i.e., entry condition 1) is: Mn + Ofn + Ocn – Hys1>Thresh1; Condition A4XX2-2-2 (i.e., entry condition 2) is: Md + Hys2 Thresh2; Md = Mv–Mr; Condition A4XX2-3-2 (i.e., departure condition 1) is: Mn + Ofn + Ocn+Hys1<Thresh1; Condition A4XX2-4-2 (i.e., departure condition 2) is: Md – Hys2>Thresh2; Md = Mv–Mr; Among them, the specific descriptions of Mn, Ofn, Ocn, Md, Mv, and Mr can be found in the above first implementation manner, and will not be elaborated here. Hys1 is the hysteresis parameter of the A4 event, Hys2 is the hysteresis parameter of the second event, Thresh1 and Thresh2 are the threshold parameters of the second event, Thresh1 is the sixth threshold, and Thresh2 is the seventh threshold (which can be the above fourth angle threshold). The unit of Thresh1 is the same as that of Mn, and the unit of Thresh2 is expressed in degrees.

[0225] In this implementation manner, when the terminal device determines whether the second event is triggered, it comprehensively considers the signal quality of the neighboring cell and the communication angle of the terminal device with respect to the neighboring cell, which not only avoids frequent handovers caused by fluctuations in cell signals or changes in the altitude of the terminal device, but also ensures that the terminal device switches to a cell with better signal quality, thereby improving communication quality and user experience.

[0226] The third implementation manner: The second event includes an A5 event and a second threshold event related to the reduction of the angle difference between the terminal device and its neighboring cell.

[0227] Optionally, the second event includes that the signal quality of the serving cell of the terminal device is lower than the eighth threshold, the signal quality of the neighboring cell is higher than the ninth threshold, and the communication angle of the terminal device in the neighboring cell is greater than or equal to the tenth threshold.

[0228] In this implementation manner, for the specific implementation of the terminal device to evaluate whether the second event is triggered, reference can be made to the case where the second event includes the A3 event and the second threshold event in the above-mentioned first implementation manner, which will not be elaborated here.

[0229] When the terminal device determines that the entry conditions of the A5 event and the entry conditions of the second threshold event are satisfied, it is considered that the entry conditions of the second event are satisfied. When the terminal device determines that the departure conditions of the A5 event and / or the departure conditions of the second threshold event are satisfied, it is considered that the departure conditions of the second event are satisfied.

[0230] For example, when the terminal device determines that the following conditions A5XX2-1-1, condition A5XX2-2-1, and condition A5XX2-3-1 are satisfied, it is considered that the entry conditions of the second event (Event A5XX2) are satisfied. When the terminal device determines that condition A5XX2-4-1 or condition A5XX2-5-1 or condition A5XX2-6-1, that is, when at least one of the following departure conditions 1 to 3 is satisfied, it is considered that the departure conditions of Event A5XX2 are satisfied.

[0231] Condition A5XX2-1-1 (i.e., entry condition 1) is: Mp + Hys < Thresh1; Condition A5XX2-2-1 (i.e., entry condition 2) is: Mn + Ofn + Ocn – Hys > Thresh2; Condition A5XX2-3-1 (i.e., entry condition 3) is: Md+Sca × Mv Thresh3; Md = Mv–Mr; Condition A5XX2-4-1 (i.e., departure condition 1) is: Mp - Hys > Thresh1; Condition A5XX2-5-1 (i.e., departure condition 2) is: Mn + Ofn + Ocn + Hys < Thresh2; Condition A5XX2-6-1 (i.e., departure condition 3) is: Md - Sca × Mv > Thresh3; Md = Mv–Mr; Among them, Mp, Mn, Ofn, Ocn, Md, Mv, Mr, and Sca can be referred to the descriptions in the above first implementation manner, and will not be elaborated here. Hys is the hysteresis parameter of the A5 event, and Thresh1, Thresh2, and Thresh3 are the threshold parameters of the second event. Thresh1 is the eighth threshold, Thresh2 is the ninth threshold, and Thresh3 is the tenth threshold (for example, it can be the above-mentioned second angle threshold). The unit of Thresh1 is the same as that of Mp, the unit of Thresh2 is the same as that of Mn, and the unit of Thresh3 is in degrees.

[0232] Still taking the terminal device as the UE3 in the above Figure 4 as an example, UE3 determines that the signal quality of gNB1 is lower than the eighth threshold, the signal quality of gNB1 is higher than the ninth threshold, and the communication angle of UE3 with gNB2 is less than the tenth threshold, that is, the above conditions A5XX1-1-1, condition A5XX1-2-1, and condition A5XX1-3-1 are simultaneously satisfied, and the second event is triggered, and the terminal device triggers the execution of CHO.

[0233] For example, when the terminal device determines that the following conditions A5XX2-1-2, condition A5XX2-2-2, and condition A5XX2-3-2 are satisfied, it is considered that the entry conditions of the second event (Event A5XX2) are met. When the terminal device determines that condition A5XX2-4-2 or condition A5XX2-5-2 or condition A5XX2-6-2, that is, when at least one of the following conditions 1 to departure condition 3 is satisfied, it is considered that the departure conditions of Event A5XX2 are met.

[0234] Condition A5XX2-1-2 (i.e., entry condition 1) is: Mp + Hys1 < Thresh1; Condition A5XX2-2-2 (i.e., entry condition 2) is: Mn + Ofn + Ocn – Hys1 > Thresh2; Condition A5XX2-3-2 (i.e., entry condition 3) is: Md + Hys2 Thresh3; Md = Mv – Mr; Condition A5XX2-4-2 (i.e., departure condition 1) is: Mp – Hys1 > Thresh1; Condition A5XX2-5-2 (i.e., departure condition 2) is: Mn + Ofn + Ocn + Hys1 < Thresh2; Condition A5XX2-6-2 (i.e., departure condition 3) is: Md – Hys2 > Thresh3; Md = Mv – Mr; Among them, Mp, Mn, Ofn, Ocn, Md, Mv, and Mr can be referred to the descriptions in the first implementation manner above, and will not be elaborated here. Hys1 is the hysteresis parameter of the A5 event, Hys2 is the hysteresis parameter of the second event, Thresh1, Thresh2, and Thresh3 are the threshold parameters of the second event. Thresh1 is the eighth threshold, Thresh2 is the ninth threshold, and Thresh3 is the tenth threshold (for example, it can be the fourth angle threshold above). The unit of Thresh1 is the same as that of Mp, the unit of Thresh2 is the same as that of Mn, and the unit of Thresh3 is expressed in degrees.

[0235] In this implementation manner, when the terminal device determines whether the second event is triggered, it comprehensively considers the signal quality of the serving cell, the signal quality of the neighboring cell, and the communication angle of the terminal device in the neighboring cell, and makes a multi-dimensional decision on whether to trigger the second event, ensuring the accuracy of the handover decision. By setting multiple threshold values, it not only avoids the situation of frequent handovers caused by cell signal fluctuations or changes in the altitude of the terminal device, but also ensures that the terminal device switches to a cell with better signal quality, thereby improving the communication quality and user experience.

[0236] Next, a specific example will be used to explain the signaling interaction process of the communication method provided in this embodiment. Figure 6 It is a signaling interaction example diagram of the communication method provided in the embodiment of the present application. As Figure 6 shown, the communication devices involved may include a terminal device and an access network device gNB. The access network device includes a source cell gNB and a target cell gNB. As Figure 6 shown, this method mainly includes the following processes: S601, the terminal device is in the RRC connected state and accesses the source cell gNB. The source cell gNB sends an RRC reconfiguration message to the terminal device. Correspondingly, the terminal device receives this RRC reconfiguration message.

[0237] Among them, the RRC reconfiguration message includes a measurement report configuration, configuration information of neighboring cells, and a CHO measurement event.

[0238] Compared with the solution in the existing standard, in the embodiment of the present application, the measurement report configuration also includes the need to measure the communication angle between the terminal device and the source cell gNB, and the communication angle between the terminal device and the gNB corresponding to the neighboring cell.

[0239] In the embodiment of the present application, the CHO measurement event includes a first event and / or a second event.

[0240] S602, the terminal device sends an RRC reconfiguration complete message to the source cell gNB. Correspondingly, the source cell gNB receives this RRC reconfiguration complete message.

[0241] S603: The terminal device measures whether the first event and / or the second event is triggered.

[0242] In the embodiment of the present application, the terminal device can measure whether the first event and / or the second event is triggered according to the specific indication of the CHO configuration information included in the RRC reconfiguration message in S601. In the case of determining that the first event and / or the second event is triggered, the CHO is triggered. Here, for the detailed introduction of the triggering of the first event and / or the second event, reference can be made to the introduction in the above embodiment, which will not be repeated here.

[0243] When the first event and / or the second event is triggered, the terminal device determines to perform a CHO switch.

[0244] S604, the terminal device sends a switching request message to the source cell gNB, and correspondingly, the source cell gNB receives the switching request message.

[0245] The switching request message includes identification information of the target cell.

[0246] S605: The source cell gNB sends a handover request message to the target cell gNB. Correspondingly, the target cell gNB receives the handover request message.

[0247] S606: The target cell gNB allows access.

[0248] S607: The target cell gNB sends a handover request response message to the source cell gNB. Correspondingly, the source cell gNB receives the handover request response message.

[0249] S608, the source cell gNB sends an RRC reconfiguration message to the terminal device, and correspondingly, the terminal device receives the RRC reconfiguration message.

[0250] The RRC reconfiguration message includes configuration information of the target cell.

[0251] S609, the terminal device initiates a random access request to the target cell gNB, and correspondingly, the target cell gNB receives the random access request.

[0252] S610: The target cell gNB responds to the random access request of the terminal device, allocates resources to the terminal device, and completes the CHO switching.

[0253] S611, the terminal device sends an RRC reconfiguration completion message to the target cell gNB, and correspondingly, the target cell gNB receives the RRC reconfiguration completion message.

[0254] For the specific processes of S604 to S611, reference can be made to the specific implementation of the CHO process in existing standards, which will not be elaborated here.

[0255] It should be noted that since the altitude of the terminal device is different, the corresponding communication angle is also different. In the communication method of the embodiments of the present application, when the terminal device measures whether the first event and / or the second event is triggered, the communication angle of the terminal device is considered, avoiding the problem that the terminal device is not within the communication range due to the high altitude of the terminal device but cannot trigger the handover in time, realizing timely cell handover and being beneficial to improving communication quality.

[0256] However, in the ground scenario, such as Figure 7 As shown, in the process of the terminal device determining whether to trigger the CHO handover, the planar communication angle and the communication height are considered, but the communication angle of the terminal device is not considered. Since the altitude change of the terminal device is small, the communication angles of the terminal devices on different floors are not much different, resulting in certain limitations for the terminal devices in the ground scenario to execute CHO applicable to the solution of the present application.

[0257] In the embodiments of the present application, when the access network device determines whether to execute LTM according to the measurement report sent by the terminal device, the access network device can measure whether the LTM measurement event is satisfied. Among them, the LTM measurement event may include the first event and / or the second event. When the access network device determines that the first event and / or the second event is triggered, the access network device sends a handover indication to the terminal device to instruct the terminal device to execute LTM.

[0258] In the present application, only the content specifically included in the LTM measurement event in the existing standard is replaced with the first event and / or the second event.

[0259] For the specific implementation of the access network device measuring whether the first event and / or the second event is triggered, reference can be made to the specific implementation of determining that the first event and / or the second event is triggered when the above-mentioned CHO measurement event includes the first event and / or the second event, which will not be elaborated here.

[0260] Thus, in the process of the access network device determining whether the terminal device executes LTM, the communication angle of the terminal device is considered, enabling the access network device to more timely instruct the terminal device to perform cell handover, which is beneficial to improving communication quality.

[0261] It should be understood that Figures 1 to 7 The flowcharts or scenario diagrams shown are only for easy understanding and do not intend to limit the embodiments of the present application to the examples in the diagrams. In fact, those skilled in the art can perform equivalent transformations based on Figures 1 to 7 the examples in, and obtain more implementation manners.

[0262] In combination with the above Figures 1 to 7 , the communication method provided in the embodiments of the present application has been described in detail. Next, the device embodiments of the present application will be described in detail in combination with Figures 8 to 9 . It should be understood that the communication device in the embodiments of the present application can execute various communication methods in the foregoing embodiments of the present application. That is, for the specific working processes of the following various products, reference can be made to the corresponding processes in the foregoing method embodiments. In the foregoing embodiments, the terminal device can execute some or all of the steps in each embodiment; the network device can execute some or all of the steps in each embodiment. These steps or operations are only examples, and the embodiments of the present application can also execute other operations or various deformations of the operations. In addition, the various steps can be executed in different orders presented in each embodiment, and it is possible not to execute all the operations in the embodiments of the present application. Moreover, the magnitude of the serial numbers of the various steps does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0263] Figure 8 FIG. is a schematic block diagram of a communication device provided in an embodiment of the present application. As Figure 8 shown, the communication device 800 may include a communication module 820. The communication module 820 can implement corresponding communication functions, and the communication functions can be the internal communication functions of the communication device 800 or the communication functions between the communication device 800 and other devices. Optionally, the communication module 820 can also be referred to as a communication interface or a transceiver module. Optionally, the communication device 800 further includes a processing module 810. The processing module 810 can implement corresponding processing functions.

[0264] Optionally, the communication device 800 further includes a storage module, which can be used to store instructions and / or data; the processing module 810 can read the instructions and / or data in the storage module to enable the communication device 800 to implement the foregoing method embodiments.

[0265] In a possible design, the communication device 800 can correspond to the terminal device in the foregoing method embodiments, or a component (such as a circuit, a chip, or a chip system, etc.) configured in the terminal device. The communication device 800 can be used to execute the steps or processes executed by the terminal device in any of the foregoing method embodiments.

[0266] For example, the communication module 820 is configured to receive conditional handover (CHO) configuration information from a source access network device. The CHO configuration information is used to configure neighboring cells of the terminal device and CHO measurement events, where the CHO measurement events include a first event and / or a second event. The first event includes an event related to an increase in the angular difference from the serving cell of the terminal device. The second event includes an event related to a decrease in the angular difference from a neighboring cell of the terminal device. The angular difference is the difference between the effective communication angle and the communication angle, and the communication angle of the terminal device is the included angle between the line connecting the terminal device and an access network device and a first line; the first line is the line connecting an access network device and the center point of the communication range of an access network device; the effective communication angle is the included angle between the line connecting any point on the boundary of the communication range of an access network device and an access network device and the first line.

[0267] The processing module 810 is configured to perform CHO according to the CHO configuration information when the first event and / or the second event is triggered.

[0268] In some embodiments, the first event further includes any one of an A3 event, an A4 event, and an A5 event; the second event includes any one of an A3 event, an A4 event, and an A5 event.

[0269] In some other embodiments, the leaving condition of the first event includes at least one of the leaving condition of the A3 event, the leaving condition of the A4 event, the leaving condition of the A5 event, and the leaving condition of the event related to an increase in the angular difference from a neighboring cell of the terminal device.

[0270] The leaving condition of the second event includes at least one of the leaving condition of the A3 event, the leaving condition of the A4 event, the leaving condition of the A5 event, and the leaving condition of the event related to a decrease in the angular difference from a neighboring cell of the terminal device.

[0271] In some other embodiments, the entry condition and / or the leaving condition of the event related to an increase in the angular difference from a neighboring cell of the terminal device is related to at least one of a first angle threshold, a first proportional parameter, a third angle threshold, and a first hysteresis parameter; The entry condition and / or the leaving condition of the event related to a decrease in the angular difference from a neighboring cell of the terminal device is related to at least one of a second angle threshold, a second proportional parameter, a fourth angle threshold, and a second hysteresis parameter.

[0272] In some other embodiments, the entry condition for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the difference between the angular difference of the serving cell of the terminal device and a first product value is greater than or equal to a first angular threshold; wherein, the first product value is the product value of a first proportional parameter and a first effective communication angle; the first effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the serving cell and the access network device corresponding to the serving cell and a first line; The departure condition for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the sum of the angular difference of the serving cell of the terminal device and the first product value is less than the first angular threshold.

[0273] In some other embodiments, the entry condition for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the sum of the angular difference of the adjacent cell of the terminal device and a second product value is less than or equal to a second angular threshold; wherein, the second product value is the product value of a second proportional parameter and a second effective communication angle; the second effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the adjacent cell and the access network device corresponding to the adjacent cell and the first line; The departure condition for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the difference between the angular difference of the adjacent cell of the terminal device and the second product value is greater than the second angular threshold.

[0274] In some other embodiments, the entry condition for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the difference between the angular difference of the serving cell of the terminal device and a first hysteresis parameter is greater than or equal to a third angular threshold; the departure condition for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the sum of the angular difference of the serving cell of the terminal device and the first hysteresis parameter is less than the third angular threshold.

[0275] In some other embodiments, the entry condition for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the sum of the angular difference of the adjacent cell of the terminal device and a second hysteresis parameter is less than or equal to a fourth angular threshold; the departure condition for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell includes: the difference between the angular difference of the adjacent cell of the terminal device and the second hysteresis parameter is greater than the fourth angular threshold.

[0276] In some other embodiments, the source access network device and the access network device corresponding to the adjacent cell are deployed on the same satellite; or, the source access network device and the access network device corresponding to the adjacent cell are deployed on different satellites.

[0277] The above are only examples, and the detailed steps or processes can refer to the description of the foregoing embodiments.

[0278] In a possible design, the communication device 800 may correspond to the access network device in the above method embodiments, or be a component (such as a circuit, a chip, or a chip system, etc.) configured in the access network device. The communication device 800 can be used to execute the steps or processes performed by the access network device in any of the above method embodiments.

[0279] Exemplarily, the communication module 820 is used to send conditional handover (CHO) configuration information to the terminal device; wherein, the CHO configuration information is used to configure the neighboring cells of the terminal device and the CHO measurement events, and the CHO measurement events include a first event and / or a second event; the first event includes an event related to an increase in the angular difference from the serving cell of the terminal device; the second event includes an event related to a decrease in the angular difference from a neighboring cell of the terminal device; the CHO measurement events are used to determine whether to perform CHO. The angular difference is the difference between the effective communication angle and the communication angle. The communication angle of the terminal device is the included angle between the connection line between the terminal device and an access network device and a first connection line. The first connection line is the connection line between an access network device and the center point of the communication range of an access network device; the effective communication angle is the included angle between the connection line between any point on the boundary of the communication range of an access network device and an access network device and the first connection line.

[0280] In some embodiments, the first event further includes any one of an A3 event, an A4 event, and an A5 event; the second event further includes any one of an A3 event, an A4 event, and an A5 event.

[0281] In some other embodiments, the leaving condition of the first event includes at least one of the leaving condition of an A3 event, the leaving condition of an A4 event, the leaving condition of an A5 event, and the leaving condition of a first threshold event.

[0282] In some other embodiments, the leaving condition of the second event includes at least one of the leaving condition of an A3 event, the leaving condition of an A4 event, the leaving condition of an A5 event, and the leaving condition of an event related to a decrease in the angular difference from a neighboring cell of the terminal device.

[0283] In some other embodiments, the entry condition and / or the leaving condition of an event related to an increase in the angular difference from a neighboring cell of the terminal device is related to at least one of a first angle threshold, a first proportional parameter, a third angle threshold, and a first hysteresis parameter; The entry condition and / or the leaving condition of an event related to a decrease in the angular difference from a neighboring cell of the terminal device is related to at least one of a second angle threshold, a second proportional parameter, a fourth angle threshold, and a second hysteresis parameter.

[0284] In some other embodiments, the entry conditions for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell include: the difference between the angular difference of the serving cell of the terminal device and a first product value is greater than or equal to a first angular threshold; wherein, the first product value is the product value of a first proportional parameter and a first effective communication angle; the first effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the serving cell and the access network device corresponding to the serving cell and a first line; The departure conditions for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell include: the sum of the angular difference of the serving cell of the terminal device and the first product value is less than the first angular threshold.

[0285] In some other embodiments, the entry conditions for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell include: the sum of the angular difference of the adjacent cell of the terminal device and a second product value is less than or equal to a second angular threshold; wherein, the second product value is the product value of a second proportional parameter and a second effective communication angle; the second effective communication angle is the included angle between the line connecting any point on the communication range boundary of the access network device corresponding to the adjacent cell and the access network device corresponding to the adjacent cell and the first line; The departure conditions for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell include: the difference between the angular difference of the adjacent cell of the terminal device and the second product value is greater than the second angular threshold.

[0286] In some other embodiments, the entry conditions for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell include: the difference between the angular difference of the serving cell of the terminal device and a first hysteresis parameter is greater than or equal to a third angular threshold; the departure conditions for an event related to an increase in the angular difference between the serving cell of the terminal device and an adjacent cell include: the sum of the angular difference of the serving cell of the terminal device and the first hysteresis parameter is less than the third angular threshold.

[0287] In some other embodiments, the entry conditions for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell include: the sum of the angular difference of the adjacent cell of the terminal device and a second hysteresis parameter is less than or equal to a fourth angular threshold; the departure conditions for an event related to a decrease in the angular difference between the serving cell of the terminal device and an adjacent cell include: the difference between the angular difference of the adjacent cell of the terminal device and the second hysteresis parameter is greater than the fourth angular threshold.

[0288] In some other embodiments, the source access network device corresponding to the serving cell and the access network device corresponding to the adjacent cell are deployed on the same satellite; or, the source access network device and the access network device corresponding to the adjacent cell are deployed on different satellites.

[0289] The above are only examples, and the detailed steps or processes can refer to the description of the foregoing embodiments.

[0290] Figure 9 Another schematic block diagram of the communication device provided by the embodiment of the present application. The communication device 900 may be a chip, a chip system, or a processor, etc. of a terminal device or an access network device for implementing the above method. The communication device 900 can be used to implement the method described in the above method embodiment, and for details, reference can be made to the description in the above method embodiment.

[0291] As Figure 9 shown, the communication device 900 may include one or more processors 910. The processor 910 may also be referred to as a processing unit or a processing module and can implement certain control functions. The processor 910 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device 900 (such as a base station, a baseband chip, a user, a user chip), execute software programs, and process data of software programs.

[0292] In an alternative design, the processor 910 may also store instructions and / or data, and the instructions and / or data may be run by the processor 910, so that the communication device 900 executes the method described in the above method embodiment.

[0293] In another alternative design, the communication device 900 may include a communication interface 920 for implementing reception and transmission functions. For example, the communication interface 920 may be a transceiver circuit, an interface, an interface circuit, or a transceiver, etc. The transceiver circuit, interface, interface circuit, or transceiver for implementing reception and transmission functions may be separate or integrated together. The above transceiver circuit, interface, interface circuit, or transceiver may be used for reading and writing code / data, or the above transceiver circuit, interface, interface circuit, or transceiver may be used for signal transmission or transfer.

[0294] Optionally, the communication device 900 may include one or more memories 930, on which instructions may be stored, and the instructions may be run on the processor 910, so that the communication device 900 executes the method described in the above method embodiment. Optionally, data may also be stored in the memory 930. Optionally, instructions and / or data may also be stored in the processor 910. The processor 910 and the memory 930 may be provided separately or integrated together.

[0295] It should be understood that in a possible design, the steps in the method embodiments provided in this application can be completed by the integrated logic circuit of the hardware in the processor or instructions in the form of software. The steps of the method disclosed in combination with the embodiments of this application can be directly implemented by the execution of the hardware processor, or completed by the combination of the hardware and software modules in the processor. The software module can be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, register, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0296] In one implementation, the communication device 900 may correspond to the terminal device in the above method embodiment and may be used to execute each step and / or process executed by the terminal device in the above method embodiment. The processor 910 may be used to execute the instructions stored in the memory 930, and when the processor 910 executes the instructions stored in the memory, the processor 910 is used to execute each step and / or process of the above method embodiment corresponding to the terminal device.

[0297] In another implementation, the communication device 900 may correspond to the network device in the above method embodiment and may be used to execute each step and / or process executed by the network device in the above method embodiment. The processor 910 may be used to execute the instructions stored in the memory 930, and when the processor 910 executes the instructions stored in the memory, the processor 910 is used to execute each step and / or process of the above method embodiment corresponding to the network device.

[0298] It should be understood that the above processing device may be one or more chips. For example, the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), a micro controller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0299] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and directrambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0300] According to the method provided by the embodiments of the present application, the present application further provides a chip system, which includes a memory and one or more processors, and is used to call and run the instructions stored in the memory from the memory, so that the method of the above embodiments of the present application is executed. The chip system can be composed of chips, or can include chips and other discrete devices.

[0301] Among them, the chip system can include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0302] According to the method provided by the embodiments of the present application, the present application further provides a communication system, which includes the foregoing access network device and terminal device.

[0303] According to the method provided by the embodiments of the present application, the present application further provides a computer program product, which includes: computer program code, when the computer program code runs on a computer, it causes the computer to execute each step or process executed by the access network device and the terminal device in any of the foregoing method embodiments.

[0304] According to the method provided by the embodiments of the present application, the present application further provides a computer-readable storage medium. The computer-readable storage medium stores program codes. When the program codes run on a computer, the computer is caused to execute each step or process performed by the access network device and the terminal device in any of the foregoing method embodiments.

[0305] The computer-readable storage medium may be the above-mentioned volatile memory or non-volatile memory, or may include both volatile memory and non-volatile memory at the same time.

[0306] In the embodiments of the present application, the terms and English abbreviations are all exemplary examples given for convenience of description, and should not constitute any limitation to the present application. The present application does not exclude the possibility of defining other terms that can achieve the same or similar functions in existing or future protocols.

[0307] In the above embodiments, it 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 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.

[0308] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings, direct couplings, or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0309] It should be understood that in various embodiments of the present application, the magnitude of the sequence numbers of the processes does not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0310] In summary, the above description is only a preferred embodiment of the technical solution of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A communication method, characterized in that: Applied to a terminal device, the method comprises: Receive conditional switching CHO configuration information from a source access network device; the CHO configuration information is used to configure a neighboring cell and a CHO measurement event of the terminal device, the CHO measurement event includes a first event and / or a second event; the first event includes an event related to an increase in the angle difference of a serving cell of the terminal device; the second event includes an event related to a decrease in the angle difference of a neighboring cell of the terminal device; executing CHO according to the CHO configuration information when the first event and / or the second event is triggered; Among them, the angle difference is the difference between the effective communication angle and the communication angle, the communication angle of the terminal device is the angle between the line between the terminal device and an access network device and the first line; the first line is the line between the one access network device and the center point of the communication range of the one access network device; the effective communication angle is the angle between the line between any point on the boundary of the communication range of the one access network device and the one access network device and the first line.

2. The method according to claim 1, characterized in that The first event also includes any one of the A3 event, the A4 event and the A5 event; The second event also includes any one of the A3 event, the A4 event and the A5 event.

3. The method according to claim 1 or 2, characterized in that: The exit condition of the first event includes at least one of the exit condition of the A3 event, the exit condition of the A4 event, the exit condition of the A5 event, and the exit condition of the event related to the increase in the angle difference of the neighboring cell of the terminal device; and / or, The exit condition of the second event includes the exit condition of the A3 event, the exit condition of the A4 event, the exit condition of the A5 event, and at least one of the exit conditions of the event related to the decrease in the angle difference of the neighboring cell of the terminal device.

4. The method according to claim 1 or 2, characterized in that: The entry condition and / or exit condition of the event related to the increasing angle difference of the serving cell of the terminal device is related to at least one of the first angle threshold, the first ratio parameter, the third angle threshold and the first hysteresis parameter; The entry condition and / or exit condition of the event related to the decrease in the angle difference of the neighboring cells of the terminal device is related to at least one of the second angle threshold, the second ratio parameter, the fourth angle threshold and the second hysteresis parameter.

5. The method according to claim 4, characterized in that The entry condition of the event related to the increase in the angle difference of the service cell of the terminal device includes: the difference between the angle difference of the service cell of the terminal device and the first product value is greater than or equal to the first angle threshold; wherein the first product value is the product value between the first proportional parameter and the first effective communication angle; the first effective communication angle is the angle between the line between any point on the communication range boundary of the access network device corresponding to the service cell and the access network device corresponding to the service cell and the first line; The exit condition of the event related to the increasing angle difference of the serving cell of the terminal device includes: the sum of the angle difference of the serving cell of the terminal device and the first product value is less than the first angle threshold; The entry condition of the event related to the decrease in the angle difference of the neighboring cell of the terminal device includes: The sum of the angle difference of the neighboring cell of the terminal device and the second product value is less than or equal to the second angle threshold; wherein the second product value is the product value between the second proportional parameter and the second effective communication angle; the second effective communication angle is the angle between the line between any point on the communication range boundary of the access network device corresponding to the neighboring cell and the access network device corresponding to the neighboring cell and the first line; The exit condition of the event related to the decrease in the angle difference of the neighboring cell of the terminal device includes: The difference between the angle difference of the neighboring cell of the terminal device and the second product value is greater than the second angle threshold.

6. The method according to claim 4, characterized in that The entry condition of the event related to the increasing angle difference of the serving cell of the terminal device includes: the difference between the angle difference of the serving cell of the terminal device and the first hysteresis parameter is greater than or equal to the third angle threshold; The exit condition of the event related to the increasing angle difference of the serving cell of the terminal device includes: the sum of the angle difference of the serving cell of the terminal device and the first hysteresis parameter is less than the third angle threshold; The entry condition of the event related to the decrease in the angle difference of the neighboring cell of the terminal device includes: the sum of the angle difference of the neighboring cell of the terminal device and the second hysteresis parameter is less than or equal to the fourth angle threshold; The exit condition of the event related to the decrease in the angle difference of the neighboring cells of the terminal device includes: the difference between the angle difference of the neighboring cells of the terminal device and the second lag parameter is greater than the fourth angle threshold.

7. The method according to claim 1 or 2, characterized in that: The source access network device corresponding to the serving cell and the access network device corresponding to the neighboring cell are deployed on the same satellite; or, The source access network device and the access network device corresponding to the neighboring cell are deployed on different satellites.

8. A communication method, characterized in that: Applied to access network equipment, the method comprises: Sending conditional switching CHO configuration information to a terminal device; wherein the CHO configuration information is used to configure a neighboring cell and a CHO measurement event of the terminal device, and the CHO measurement event includes a first event and / or a second event; the first event includes an event related to an increase in the angle difference of a serving cell of the terminal device; and the second event includes an event related to a decrease in the angle difference of a neighboring cell of the terminal device; The CHO measurement event is used to determine whether to execute CHO, wherein the angle difference is the difference between the effective communication angle and the communication angle, the communication angle of the terminal device is the angle between the line between the terminal device and an access network device and the first line; the first line is the line between the one access network device and the center point of the communication range of the one access network device; the effective communication angle is the angle between the line between any point on the boundary of the communication range of the one access network device and the one access network device and the first line.

9. The method according to claim 8, characterized in that The first event also includes any one of the A3 event, the A4 event and the A5 event, and / or an event related to an increase in the angle difference of the serving cell of the terminal device; The second event also includes any one of the A3 event, the A4 event and the A5 event, and / or the event related to the decrease in the angle difference of the neighboring cell of the terminal device.

10. The method according to claim 8 or 9, characterized in that: The exit condition of the first event includes at least one of the exit condition of the A3 event, the exit condition of the A4 event, the exit condition of the A5 event, and the exit condition of the event related to the increase in the angle difference of the neighboring cell of the terminal device; and / or, The exit condition of the second event includes the exit condition of the A3 event, the exit condition of the A4 event, the exit condition of the A5 event, and at least one of the exit conditions of the event related to the decrease in the angle difference of the neighboring cell of the terminal device.

11. The method according to claim 8 or 9, characterized in that: The entry condition and / or exit condition of the event related to the increasing angle difference of the serving cell of the terminal device is related to at least one of the first angle threshold, the first ratio parameter, the third angle threshold and the first hysteresis parameter; The entry condition and / or exit condition of the event related to the decrease in the angle difference of the neighboring cells of the terminal device is related to at least one of the second angle threshold, the second ratio parameter, the fourth angle threshold and the second hysteresis parameter.

12. The method according to claim 11, characterized in that The entry condition of the event related to the increase in the angle difference of the service cell of the terminal device includes: the difference between the angle difference of the service cell of the terminal device and the first product value is greater than or equal to the first angle threshold; wherein the first product value is the product value between the first proportional parameter and the first effective communication angle; the first effective communication angle is the angle between the line between any point on the communication range boundary of the access network device corresponding to the service cell and the access network device corresponding to the service cell and the first line; The exit condition of the event related to the increasing angle difference of the serving cell of the terminal device includes: the sum of the angle difference of the serving cell of the terminal device and the first product value is less than the first angle threshold; The entry condition of the event related to the decrease in the angle difference of the neighboring cell of the terminal device includes: The sum of the angle difference of the neighboring cell of the terminal device and the second product value is less than or equal to the second angle threshold; wherein the second product value is the product value between the second ratio parameter and the second effective communication angle; the second effective communication angle is the angle between the line between any point on the communication range boundary of the access network device corresponding to the neighboring cell and the access network device corresponding to the neighboring cell and the first line; The exit condition of the event related to the decrease in the angle difference of the neighboring cell of the terminal device includes: The difference between the angle difference of the neighboring cell of the terminal device and the second product value is greater than the second angle threshold.

13. The method according to claim 11, characterized in that The entry condition of the event related to the increasing angle difference of the serving cell of the terminal device includes: the difference between the angle difference of the serving cell of the terminal device and the first hysteresis parameter is greater than or equal to the third angle threshold; The exit condition of the event related to the increasing angle difference of the serving cell of the terminal device includes: the sum of the angle difference of the serving cell of the terminal device and the first hysteresis parameter is less than the third angle threshold; The entry condition of the event related to the decrease in the angle difference of the neighboring cell of the terminal device includes: the sum of the angle difference of the neighboring cell of the terminal device and the second hysteresis parameter is less than or equal to the fourth angle threshold; The exit condition of the event related to the decrease in the angle difference of the neighboring cells of the terminal device includes: the difference between the angle difference of the neighboring cells of the terminal device and the second lag parameter is greater than the fourth angle threshold.

14. The method according to claim 8 or 9, characterized in that: The source access network device and the access network device corresponding to the neighboring cell are deployed on the same satellite; or, The source access network device and the access network device corresponding to the neighboring cell are deployed on different satellites.

15. A communication device, characterized in that: The device comprises at least one processor, wherein the at least one processor is coupled to a memory, wherein the memory stores programs or instructions, and wherein the processor executes the programs or instructions so that the device is used to execute the method as claimed in any one of claims 1 to 7, and / or execute the method as claimed in any one of claims 8 to 14.

16. A communication system, characterized in that: The system includes a terminal device and an access network device. The terminal device is used to execute the method according to any one of claims 1 to 7, and the access network device is used to execute the method according to any one of claims 8 to 14.

17. A computer program product, characterized in that The computer program product comprises: a computer program or instructions, which, when executed on a computer, enables the computer to execute the method according to any one of claims 1 to 7 and / or implement the method according to any one of claims 8 to 14.

18. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented, and / or the method according to any one of claims 8 to 14 is implemented.

19. A chip system, comprising a memory and one or more processors, characterized in that: When the program / instructions stored in the memory are executed by the processor, the method according to any one of claims 1 to 7 is implemented, and / or the method according to any one of claims 8 to 14 is implemented.

Images