Communication method, communication device, and communication system

Abstract

The present application provides a communication method, a communication device, and a communication system, which relate to the field of communication technology. For example, the method can be applicable to a cell switching scenario. In the method, after the terminal device receives CHO configuration information from a source access network device for configuring the terminal device's neighboring cells and CHO measurement events, the terminal device performs CHO according to the CHO configuration information when the first event and / or the second event is triggered. The first event includes an event related to an increase in the angle difference of the terminal device's service cell; the second event includes an event related to a decrease in the angle difference of the terminal device's neighboring cells. In the method, when the terminal device measures whether to trigger the CHO measurement event, the angle difference of the terminal device's service cell and / or the angle difference of the terminal device's neighboring cells are taken into account, thereby achieving the purpose of timely switching cells of the terminal device at different altitudes, which is conducive to improving communication quality and user experience.

Description

Technical Field

[0001] The 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 communications, in order to improve communication quality and ensure normal transmission of communication data, the terminal device can select a target cell from other candidate cells except the currently located cell (or called the source cell) and switch from the source cell to the target cell. This switching process can be called cell switching or switching cell.

[0003] Currently, in non-terrestrial network (NTN) scenarios, various conditional handover (CHO) solutions can trigger terminal devices to switch between different cells, such as time-based, location-based, or measurement-based. In NTN scenarios, ensuring stable terminal device communications during cell handovers remains a pressing issue. 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, thereby improving communication quality and user experience.

[0005] In a first aspect, a communication method is provided. This method can be executed, for example, by a terminal device, or by a component configured in the terminal device (such as a circuit, chip, or chip system), or by a logic module or software that implements all or part of the terminal device's functions. This application is not limited to this. The following description uses a terminal device as an example.

[0006] The method includes: after the terminal device receives CHO configuration information from the source access network device, according to the CHO configuration information, when the first event and / or the second event is triggered, CHO is performed. The CHO configuration information is used to configure the neighboring cells and CHO measurement events of the terminal device. The CHO measurement event includes the first event and / or the second event. The first event includes an event related to the increase in the angle difference of the service cell of the terminal device. The second event is an event related to the decrease in the angle difference of the neighboring cell of the terminal device. 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 an access network device and the center point of the communication range of an access network device. The effective communication angle is the angle between the line between any point on the boundary of the communication range of an access network device and an access network device and the first line.

[0007] In this implementation, since the angle difference of the service cell of the terminal device at different altitudes and / or the angle difference of the neighboring cell of the terminal device are not the same, when the altitude of the terminal device changes, resulting in large fluctuations in signal quality, the terminal device considers the angle difference of the service cell of the terminal device and / or the angle difference of the neighboring cell of the terminal device when weighing whether to trigger the CHO measurement event, so that the terminal device immediately triggers cell switching when determining that the angle difference of the service cell becomes larger and / or the angle difference of the neighboring cell of the terminal device becomes smaller, thereby achieving the purpose of timely switching of cells by the terminal device at different altitudes, which is beneficial not only to improving the accuracy of the terminal device in measuring signal quality, but also to improving the accuracy of judging cell switching, thereby benefiting to improving 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 by a component configured in the access network device (such as a circuit, chip, or chip system). It can also be implemented by a logic module or software that implements all or part of the functions of the access network device. This application is not limited to this. The following description uses an 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 and CHO measurement events of the terminal device, and the CHO measurement events include a first event and / or a second event; the first event includes an event related to the increase in the angle difference of the service cell of the terminal device. The second event is an event related to the decrease in the angle difference of the neighboring cells of the terminal device; the CHO measurement event is used to determine whether to execute CHO. 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 an access network device and the center point of the communication range of an access network device. The effective communication angle is the angle between the line between 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 angle difference of the service cell of the terminal device at different altitudes and / or the angle difference of the neighboring cell of the terminal device are different, 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 angle difference of the service cell of the terminal device and / or the angle difference of the neighboring cell of the terminal device, so that the terminal device determines that the angle difference of the service cell becomes larger and / or the angle difference of the neighboring cell of the terminal device becomes smaller, and immediately triggers cell switching, thereby enabling the terminal device to switch cells in time at different altitudes, avoiding the situation where the terminal device cannot switch in time due to fluctuations in signal quality due to changes in the altitude of the terminal device, which is beneficial to not only improving the accuracy of the terminal device in measuring signal quality, but also improving the accuracy of judging cell switching, thereby improving communication quality and user experience.

[0011] The second aspect is the implementation on the access network device side corresponding to the first aspect. The explanation, supplement and description of the beneficial effects of the first aspect are also applicable to the second aspect and will not be repeated here.

[0012] In a third aspect, a communication method is provided. This method can be executed, for example, by a terminal device, or by a component configured in the terminal device (such as a circuit, chip, or chip system), or by a logic module or software that implements all or part of the terminal device's functions. This application is not limited to this. The following description uses a terminal device as an example.

[0013] The method includes: after a terminal device receives layer 1 / 2 triggered mobility management (LTM) configuration information from a source access network device, it sends a measurement report to the source access network device. The LTM configuration information is used to configure the measurement report and the terminal device's neighboring cells. After the terminal device receives a handover indication from the source access network device, it executes layer 1 / 2 triggered mobility management (LTM). The handover indication is used to instruct the terminal device to execute LTM, and the handover indication is sent by the source access network device to the terminal device when an 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 angle difference of the terminal device's serving cell. The second event is related to the angle difference of the terminal device's neighboring cells. 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 a line connecting the terminal device and an access network device and a first line. The first line is a line connecting the center points of the communication ranges of one access network device and another access network device. The effective communication angle is the angle between a line connecting any point on the communication range boundary of an access network device and the access network device and the first line.

[0014] In this implementation, since the angle difference of the service cell of the terminal device at different altitudes and / or the angle difference of the neighboring cell of the terminal device are not the same, when the altitude of the terminal device changes, resulting in large fluctuations in signal quality, the access network device considers the angle difference of the service cell of the terminal device and / or the angle difference of the neighboring cell of the terminal device when measuring whether to trigger the LTM measurement event. This not only improves the accuracy of the access network device in judging cell switching, but also achieves the purpose of timely switching of cells by the terminal device at different altitudes, which is conducive to improving communication quality and user experience.

[0015] A fourth aspect provides a communication method. This method can be performed, for example, by an access network device, or by a component configured in the access network device (such as a circuit, chip, or chip system). It can also be implemented by a logic module or software that implements all or part of the functions of the access network device. This application is not limited to this. The following description uses an access network device as an example.

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

[0017] In this implementation, when the access network device determines whether the LTM measurement event is met, the angle difference of the terminal device's service cell and / or the angle difference of the terminal device's neighboring cell is taken into consideration, thereby enabling the terminal device to switch cells in a timely manner at different altitudes. This not only improves the accuracy of the access network device in determining cell switching, but also avoids the situation where the terminal device is unable to switch in a timely manner due to fluctuations in signal quality due to changes in the altitude of the terminal device, which is conducive to improving communication quality and user experience.

[0018] The fourth aspect is the implementation on the access network equipment side corresponding to the third aspect. The explanation, supplement and description of the beneficial effects of the third aspect are also applicable to the fourth aspect and will not be repeated here.

[0019] In a fifth aspect, a communication device is provided, comprising 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 and CHO measurement events of a terminal device.

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

[0021] In a sixth aspect, a communication device is provided, comprising a transceiver module configured to send CHO configuration information to a terminal device, the CHO configuration information being used to configure a neighboring cell and a CHO measurement event of the terminal device, the CHO measurement event including a first event and / or a second event.

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

[0023] In a seventh aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and can be configured to execute instructions or data in the memory to implement the method of any possible implementation of the first or third aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

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

[0025] In another implementation, 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 may be an input / output interface.

[0026] In an eighth aspect, a communication device is provided, comprising a processor. The processor is coupled to a memory and can be configured to execute instructions or data in the memory to implement the method of any possible implementation of the second or fourth aspects. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

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

[0028] In another implementation, 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 may be an input / output interface.

[0029] In a ninth aspect, a processor is provided, comprising: 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 a signal through the output circuit, so that the processor executes the method in any possible implementation of any aspect.

[0030] In a specific implementation, the 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 a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

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

[0032] Optionally, there are one or more processors and one or more memories.

[0033] In the eleventh aspect, a computer program product is provided, which includes: a computer program (also referred to as code, or instructions), which, when executed, enables a computer to execute a method in any possible implementation of any of the above aspects.

[0034] In the twelfth aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instructions) which, when run on a computer, enables the computer to execute a method in any possible implementation of any of the above aspects.

[0035] In a thirteenth aspect, embodiments of the present application provide a chip system comprising a memory and one or more processors, configured to retrieve and execute instructions stored in the memory, thereby executing the method of each of the above aspects or any possible implementation of each aspect. The chip system may be composed of a chip or may include a chip 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, comprising the aforementioned terminal device and access network device. Optionally, the communication system may further comprise other devices that communicate with the terminal device and / or the access network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An application scenario diagram of the communication system provided in an embodiment of the present application;

[0039] Figure 2 Another application scenario diagram of the communication system provided in an embodiment of the present application;

[0040] Figure 3 An example diagram of the communication angle and effective communication angle provided in the embodiments of the present application;

[0041] Figure 4 A scenario diagram of CHO switching provided in an embodiment of the present application;

[0042] Figure 5 A flow chart of a communication method provided in an embodiment of the present application;

[0043] Figure 6 An example diagram of signaling interaction of the communication method provided in an embodiment of the present application;

[0044] Figure 7 An example diagram of a ground scene provided in an embodiment of the present application;

[0045] Figure 8 A schematic block diagram of a communication device provided in an embodiment of the present application;

[0046] Figure 9 Another schematic block diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0048] The technical solutions provided in 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) system, sidelink communication system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, non-terrestrial network (NTN) communication system, fifth generation (5G) mobile communication system or new radio access technology (NR). Among them, 5G mobile communication system can include non-standalone (NSA) and / or standalone (SA) networking. The technical solutions provided in this application can also be applied to future communication systems. This application is not limited to this.

[0049] For example, Figure 1 This is an application scenario diagram of the communication system provided in the embodiment of the present application. The communication method provided in the embodiment of the present application can be applied to Figure 1 The communication system 100 in the embodiment may include a terminal device 110 and an access network device 120. The terminal device 110 and the access network device 120 may be respectively described in the following “terminal device” and “access network device”, which will not be described in detail here.

[0050] The access network device 120 in the embodiments of the present application can be a device with signal transceiver capabilities located on various extraterrestrial satellites. Examples include Global Positioning System satellites, Beidou satellites, and communication satellites used by various operators. Within the coverage area of ​​the access network device 120, the access network device 120 can communicate with the terminal device 110.

[0051] Figure 1The example shows one terminal device 110 and one access network device 120. Optionally, the communication system 100 may further include multiple access network devices and / or multiple terminal devices.

[0052] For example, Figure 2 This is another application scenario diagram of the communication system provided in the embodiment of the present application. Figure 2 As shown, the communication system may include access network equipment and terminal equipment. Access network equipment may include base stations, eNBs, and gNBs. The following examples primarily use gNBs as access network equipment. There may be multiple access network equipment, such as gNB1 and gNB2. gNB1 and gNB2 may be deployed on the same satellite or on different satellites, without limitation. There may also be multiple terminal equipment, such as UE1, UE2, UE3, UE4, UE5, UE6, and UE7. UE1-UE5 are connected to gNB1, while UE6 and UE7 are connected to gNB2. Figure 2 The communication system shown further includes cell 1 (Cell 1), cell 2 (Cell 2), cell 3 (Cell 3), and so on.

[0053] A cell, also known as a cellular cell, refers to the area covered by an access network device or a part of an access network device (sector antenna) in a cellular communication system. In this area, terminal devices can communicate with the access network device through wireless channels. Figure 2 As shown, the communication range of gNB1 includes Cell 1 and Cell 2, and the communication range of gNB2 includes Cell 3. In Cell 1, UE1 and UE2 can communicate with gNB1 via radio channels. In Cell 2, UE3, UE4, and UE5 can communicate with gNB1 via radio channels. In Cell 3, UE6 and UE7 can communicate with gNB2 via radio channels.

[0054] exist Figure 2 In the communication system shown, the cell or access network device to which the terminal device is connected is not fixed. The terminal device can perform cell handover (HO) to switch to a different cell to communicate with the access network device.

[0055] The access network device in this application may be a device on the network side. 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 the terminal. The access network device includes but is not limited to the base station (base station) in the above-mentioned communication system, the evolved NodeB (eNodeB), the transmission reception point (TRP), the next generation NodeB (gNB) in the 5G mobile communication system, the access network device or the module of the access network device in the open access network (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 may also be a module or unit that can realize some functions of the base station. The access network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, or a wireless controller in the cloud radio access network (CRAN) scenario. Optionally, the access network device may also be a server, a wearable device, or an in-vehicle device, etc. For example, the access network device in vehicle-to-everything (V2X) technology may be a road side unit (RSU). Multiple access network devices in a communication system may be base stations of the same type or different types. A base station may communicate with a terminal or communicate with the terminal through a relay station. A terminal may communicate with multiple base stations using different access technologies. The embodiments of this application do not limit the specific technology or device form used 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 that can implement the functions of the access network device, such as other network devices, should all fall within the scope of protection of this application.

[0056] In this application, the device for implementing the function of a network device can be a network device, or a device that can support the network device to implement the function, such as a processor, circuit, chip, or chip system, etc. The device can be installed in the network device or connected to the network device for use. In the technical solution provided in this application, the technical solution provided in this application is described by taking the device for implementing the function of a network device as an example.

[0057] The terminal device in this application may be a wireless terminal device capable of receiving satellite scheduling and indication information. A wireless terminal device may be a device that provides voice and / or data connectivity to a user, or a handheld device with wireless connectivity, or other processing device connected to a wireless modem. For example, the terminal device may communicate with one or more core networks or the Internet via a radio access network (RAN). The terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. The terminal device can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), ultra-reliable low-latency communication (URLLC), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, or satellite communication. The terminal may be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, aircraft (such as drone, helicopter, airplane), hot air balloon, ship, robot, robotic arm, or smart home device, etc. The embodiments of the present application do not limit the form of the terminal device.

[0058] In this application, the device for implementing the function of a terminal device can be a terminal device, or a device that can support the terminal device to implement the function, such as a processor, circuit, chip, chip system, etc. The device can be installed in the terminal device or connected to the terminal device for use. In the technical solution provided in this application, the technical solution provided in this application is described by taking the terminal device as an example in which the device for implementing the function of the terminal device is a terminal device.

[0059] The access network equipment and / or the terminal equipment can be fixed or movable. The access network equipment and / or the terminal equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons and artificial satellites in the air. The embodiments of the present application do not limit the application scenarios of the access network equipment and the terminal equipment. The access network equipment and the terminal equipment can be deployed in the same scenario or different scenarios, for example, the access network equipment is deployed on a satellite and the terminal equipment is deployed on land; or, the access network equipment and the terminal equipment are deployed on land at the same time; or, the access network equipment is deployed on land and the terminal equipment is deployed on the water surface, etc., and no further examples are given.

[0060] In practical applications, multiple network devices can collaborate to assist terminals in achieving wireless access, with different network devices each implementing portions of a base station's functionality. For example, a network device can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be separate or included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0061] In different systems, the CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meanings. For example, in the ORAN system, the CU may also be called an O-CU (Open CU), the DU may also be called an O-DU, the CU-CP may also be called an O-CU-CP, the CU-UP may also be called an O-CU-UP, and the RU may also be called an O-RU. Any of the CU (or CU-CP, CU-UP), DU, and RU in this application may be implemented as a software module, a hardware module, or a combination of software and hardware modules. The CU (or CU-CP and CU-UP), DU, and RU can implement different protocol layer functions.

[0062] To facilitate understanding of the embodiments of the present application, a brief description of the terms used in the present application is first provided. Alternatively, the interpretation of some terms may refer to the interpretations in the 3rd Generation Partnership Project (3GPP) standard protocols.

[0063] 1. Event: This triggers a terminal device to perform measurement reporting or cell handover. This means that in response to the occurrence / triggering of this event, the terminal device performs measurement reporting or cell handover. Events can include at least one of the following: A1 event, A2 event, A3 event, A4 event, A5 event, B1 event, and B2 event. Other events may also be included without limitation. These events are explained below.

[0064] The A1 event is when 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 switching. In this application, the serving cell is the cell where the terminal device is currently residing or the cell currently providing network services to the terminal device.

[0065] The A2 event is that the signal quality of the serving cell is lower than a threshold 2. Optionally, an operation such as a cell handover may usually occur after the A2 event occurs.

[0066] The A3 event is when the signal quality of the same-frequency / different-frequency neighboring cell is higher than the signal quality 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 a cell that replaces the serving cell to perform network services for the terminal device. The neighboring cell can be replaced by a neighboring cell, a candidate cell, or other names without limitation.

[0067] The A4 event is when the signal quality of the neighboring cell is higher than a threshold value 3. Optionally, the A4 event is used to trigger operations such as measurement reporting or cell switching.

[0068] The A5 event occurs when the signal quality of the serving cell falls below a threshold of 4, while the signal quality of the neighboring cell rises above a threshold of 5. The signal quality of the serving cell of the terminal device decreases, while the signal quality of the neighboring cell improves. The A5 event is used to trigger measurement reporting or cell switching.

[0069] B1 event means that the quality of the neighboring cell of the heterogeneous system exceeds a preset threshold. B1 event has nothing to do with the signal quality of the serving cell, but only depends on the signal strength of the neighboring cell of the heterogeneous system. Among them, the neighboring cell of the heterogeneous system refers to the neighboring cell that uses a different wireless access technology than the current serving cell. For example, the wireless access technology of the current serving cell of the terminal device is the fourth generation mobile communication technology (4G th The wireless access technology of the neighboring cell is the third generation mobile communication technology (3 th Same-system neighboring cells refer to cells whose current serving cell and neighboring cell use the same wireless access technology. For example, both the current serving cell and neighboring cell use 4G wireless access technology.

[0070] The B2 event is that the signal quality of the serving cell is lower than threshold 1, and the signal quality of the neighboring cell of the different system is higher than threshold 2.

[0071] The embodiment of the present application does not limit the events or the sizes of the thresholds involved in the above events. The measurement report can be triggered periodically or by events.

[0072] It should be understood that the technical terms in this application are for illustration only and are not intended to limit the scope of the present invention. For example, as technology evolves, technical terms may also change. In the case of the same technical meaning, other technical terms should also apply to this application.

[0073] 2. Communication Angle: This refers to the angle between the line connecting the terminal device and the access network device and the first line. The first line is the line connecting the access network device and the center point of the access network device's communication range. The access network device's communication range can be the beam coverage range.

[0074] 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.

[0075] If a terminal device has multiple antennas, it can measure the communication angle using methods such as round-trip time (RTT) or angle of departure (AOD). The specific implementation process is based on existing technology and will not be further described here.

[0076] If the terminal device does not have multi-antenna technology or angle measurement capabilities, 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. The three-dimensional information may include longitude coordinates, latitude coordinates, and altitude.

[0077] The following uses the example of an access network device deployed on a satellite and the longitude and latitude coordinates of the satellite as the longitude and latitude coordinates of the access network device 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.

[0078] The terminal device can receive downlink signals from the satellite on which the access network device is located. After receiving the downlink signal from the access network device, including the satellite's ephemeris information, the terminal device can obtain the satellite's ephemeris information from the downlink signal. The terminal device can then determine the satellite's longitude and latitude coordinates (i.e., the longitude and latitude coordinates of the access network device) based on the satellite's ephemeris information.

[0079] The process by which the terminal device determines the latitude and longitude coordinates of a satellite based on the satellite's ephemeris information is as follows:

[0080] In the first step, the terminal device extracts the following parameters from the satellite's ephemeris information: orbit semi-major axis, orbit eccentricity, orbit inclination, right ascension of the ascending node, argument of perigee, mean anomaly, and mean motion.

[0081] In the second step, the terminal device calculates the mean anomaly of the satellite at the current moment. For example, the terminal device may use the following formula (1) to calculate the mean anomaly of the satellite at the current moment.

[0082] Formula (1);

[0083] in, Indicates the current moment, represents the epoch time, - From the epoch time The time difference between the start and the end, Indicates the satellite at the current time The mean anomaly angle, Indicates the mean anomaly at the epoch.

[0084] In the third step, the terminal device can find the true anomaly of the satellite. For example, the terminal device can use an iterative method to solve Kepler's equation (2) to find the true anomaly of the satellite.

[0085] Formula (2);

[0086] in, Indicates the satellite at the current time The mean anomaly angle, represents the satellite's anomaly angle, represents the orbital eccentricity.

[0087] After the terminal device determines the eccentric anomaly angle E, the true anomaly angle can be calculated using the following formula (3): .

[0088] Formula (3);

[0089] In the fourth step, the terminal device can calculate the position of the satellite on the orbital plane. For example, the terminal device can calculate the horizontal coordinate and vertical coordinate of the satellite on the orbital plane using the following formulas (4) and (5).

[0090] Formula (4);

[0091] Formula (5);

[0092] in, represents the semi-major axis of the orbit, and They represent the horizontal and vertical coordinates of the satellite on the orbital plane, represents the true anomaly of the satellite, represents the orbital eccentricity.

[0093] In the fifth step, the terminal device can convert the horizontal and vertical coordinates of the satellite on the orbital plane into the geocentric coordinate system. For example, the terminal device can use the following formula (6) to convert the coordinates of the satellite on the orbital plane into the geocentric coordinate system.

[0094] Formula (6);

[0095] Then, the terminal device uses the orbital inclination, the right ascension of the ascending node, and the argument of perigee to rotate the satellite coordinates in the geocentric coordinate system to obtain the rotated geocentric coordinates.

[0096] Formula (7);

[0097] in, 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 They are respectively around Axis and The rotation matrix about the axis.

[0098] In step 6, the terminal device may convert the satellite's coordinates in the geocentric coordinate system to the earth-centered earth-fixed (ECEF) coordinate system. For example, the terminal device may use the following formula (8) to convert the satellite's coordinates in the geocentric coordinate system to the earth-centered earth-fixed coordinate system.

[0099] Formula (8);

[0100] in, represents the angle of the Earth's rotation, Represents the coordinates of the satellite in the Earth-centered, Earth-fixed coordinate system.

[0101] In the seventh step, the terminal device may convert the satellite's coordinates in the Earth-centered Earth-fixed coordinate system into the satellite's latitude and longitude coordinates. For example, the terminal device may convert the satellite's coordinates in the Earth-centered Earth-fixed coordinate system into the satellite's latitude and longitude coordinates using the following formulas (9) and (10).

[0102] Formula (9);

[0103] Formula (10);

[0104] in, , is the longitude of the satellite, is the latitude of the satellite, 、 as well as Represents the coordinates of the satellite in the Earth-centered fixed coordinate system.

[0105] The signal strength and direction of signals sent by different access network devices vary. A terminal device can determine which access network device's communication range it is within based on the signal strength and direction of the signals it receives. Once the communication range of the access network device is determined, the terminal device can retrieve the longitude and latitude coordinates of the center point of the communication range from a pre-stored database. Furthermore, the terminal device can determine its longitude and latitude coordinates, as well as its altitude, using global navigation satellite systems (such as the Global Positioning System and the Beidou Navigation Satellite System).

[0106] After the terminal device determines the latitude and longitude coordinates and altitude of the terminal device, the latitude and longitude coordinates and altitude of the access network device, and the latitude and longitude coordinates and altitude of the center point of the communication range, the communication angle can be determined 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.

[0107] Still Figure 3 As shown in the figure, assume that the three-dimensional information coordinates of 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 based on the three-dimensional information coordinates of points U, G, and P are as follows:

[0108] In step 1, the terminal device calculates two vectors, namely, vector GP and vector GU.

[0109] GP=(x_P-x_G,y_P-y_G,z_P-z_G);

[0110] GU=(x_U-x_G,y_U-y_G,z_U-z_G);

[0111] Step 2: Calculate the dot product of vector GP and vector GU.

[0112] 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);

[0113] Step 3: Calculate the modulus of vector GP and vector GU.

[0114] ;

[0115] ;

[0116] Step 4: Calculate the cosine of the angle between vector GP and vector GU.

[0117] cos(α)=(GP·GU) / (|GP|*|GU|);

[0118] Step 5: Use the arccosine function (arccos) to calculate the angle α, which is the communication angle.

[0119] ;

[0120] 3. Effective communication angle: refers to the 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-mentioned first line.

[0121] Still Figure 3 As shown, the position G of the access network device and the center point P of the communication range of the access network device form an edge GP, and the point Q on the boundary of the communication range of the access network device and the position G of the access network device form another edge QG. The angle β formed by QG and GP is the effective communication angle.

[0122] The process of calculating the effective communication angle by the terminal device 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 boundary of the communication range can be referred to the above-mentioned 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, and will not be repeated here.

[0123] Terminal devices can determine whether a signal is at the edge of the communication range by measuring the received signal strength. For example, if the signal strength falls below a certain threshold, the signal may be at the edge of the communication range. Terminal devices can obtain three-dimensional information about any point on the communication range edge using methods such as laser ranging and radar ranging.

[0124] 4. Cell Handover (HO): This refers to the process within a communication system where a terminal device completes the migration of the radio link connection from the source cell (Source Cell) to the target cell (Target Cell) under the control of the radio access network. This involves exchanging an ongoing call or data transmission between the wireless channels of different cells to ensure communication continuity. The handover process involved in a cell handover by a terminal device typically includes three phases: handover preparation, handover execution, and handover completion. The terminal device and access network equipment cooperate to implement cell handover. Before switching from the source cell to the target cell, the terminal device may first identify multiple candidate cells for handover and select one candidate cell from the multiple candidate cells as the target cell.

[0125] Cell handovers can include intra-site cell handovers and inter-site cell handovers. Intra-site cell handovers occur when a terminal device switches from one cell of a particular access network device to another cell of the same access network device. Both cells are within the coverage area of ​​the same access network device and are served by the same access network device. Network connections and communications between the two cells are handled by the same access network device. Inter-site cell handovers occur when a terminal device switches from one cell of a particular access network device to another cell of another access network device.

[0126] Continue as Figure 2 As shown in the figure, UE3 is within the coverage area of ​​both cell 2 and cell 1, which are covered by the same access network device, gNB1. UE3 can switch from cell 2 to cell 1, achieving intra-site cell handover. UE5 is within the coverage area of ​​both 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, achieving inter-site cell handover. Under current standards, cell handover technologies primarily involve Layer 1 / 2 triggered mobility management (LTM) and CHO. LTM triggers cell handover based on measurement results from protocol layers 1 and 2 and instructions from access network devices.

[0127] Conditional handover (CHO) refers to a cell handover performed by a terminal device when one or more execution conditions are met. Upon receiving CHO configuration information, the terminal device begins evaluating the execution conditions and ceases evaluating these execution conditions after completing a handover. When a terminal device performs conditional handover, it independently decides whether to perform a cell handover when certain execution conditions are met, based on the neighboring cells of multiple terminal devices configured by the network device. The process of a terminal device performing conditional handover primarily involves two types of conditions: CHO triggering conditions (Leaving Conditions) and CHO execution conditions (Execution Conditions). During the CHO execution process, the CHO triggering conditions and CHO execution conditions must be met in sequence before CHO can begin. Meeting CHO execution conditions can include meeting CHO entry conditions and not meeting CHO exit conditions.

[0128] The communication equipment involved in CHO includes terminal equipment and access network equipment gNB. Access network equipment is divided into source cell gNB and neighboring cell gNB. Neighboring cell gNB can be further divided into target cell gNB and access network equipment other than the target cell, which is recorded as potential cell gNB.

[0129] 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 the handover, and the access network device corresponding to the source cell may refer to the source access network device. The target cell may be the cell accessed by the terminal device after performing the cell handover, and the access network device corresponding to the target cell may refer to the target access network device. As described above, the access network device mentioned in this application may be a base station or a next-generation base station gNB, etc.

[0130] It should be noted that for a detailed introduction to the main signaling interaction processes of LTM and CHO, reference may be made to the introduction in existing standards, which will not be repeated in the embodiments of this application.

[0131] Currently, in NTN scenarios, such as low-orbit satellite communications, when a terminal device is at a certain altitude, it may appear to be geographically within communication range, but not actually be within range, resulting in communication failure between the terminal and access network equipment. Traditional conditional switching solutions fail to account for the varying communication angles caused by the varying altitudes of the terminal device, leading to delayed conditional switching and poor communication stability.

[0132] For example, Figure 4 As shown in the figure, UE1 is located within the communication range of gNB1, and UE1 and gNB1 can communicate normally. UE2 is also located within the communication range of gNB1, but due to UE2's high altitude, communication between UE2 and gNB1 is impossible. UE3 is also located within the communication range of gNB1, but due to UE3's high altitude, communication between UE3 and gNB1 is also impossible. However, existing conditional handover solutions do not consider the altitude of terminal devices. As a result, terminal devices cannot trigger cell handovers in a timely manner. For example, it cannot trigger UE3 to handover from gNB1 to gNB2 in a timely manner, resulting in poor communication quality.

[0133] Furthermore, if the pitch / elevation angle of the access network device is too large or too small, communication stability may also deteriorate. For example, when the pitch / elevation angle of the access network device is too large, the signal may be attenuated due to obstructions such as buildings and terrain, resulting in reduced communication quality. If the pitch / elevation angle of the access network device is too small, the signal may be interfered with due to multipath effects, also affecting communication quality. Existing conditional switching solutions do not take into account the situation where the pitch / elevation angle changes due to changes in the geographic location of the access network device, which can lead to higher cell switching frequencies.

[0134] In response to the problem that the triggering conditions are not switched in time due to the different altitudes of the terminal devices, the present application provides a communication method, including an access network device corresponding to the service cell of the terminal device (i.e., the source access network device) sending CHO configuration information to the terminal device, wherein the CHO configuration information is used to configure the neighboring cells of the terminal device, including CHO measurement events of the first event and / or the second event. The first event includes an event related to the increase in the angle difference of the service cell of the terminal device, and the second event includes an event related to the decrease in the angle difference of the neighboring 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 angle difference of the service cell and / or the neighboring cell of the terminal devices at different altitudes is not the same, the CHO measurement event configured by the source access network device is related to the angle difference of the service cell or the neighboring cell of the terminal device. It can be seen that the terminal device takes into account the altitude of the terminal device in the process of judging whether the CHO measurement event is triggered, thereby achieving timely switching of cells, which is conducive to improving communication quality.

[0135] The following describes the solution provided by this application in detail in conjunction with the corresponding flowcharts. It will be understood that the schematic flowcharts provided in this application primarily use different devices (e.g., terminal devices, access network devices) as examples of the execution entities of the interaction diagrams to illustrate the method, but this application does not limit the execution entities of the interaction diagrams. For example, the device (e.g., terminal device, access network device) in the schematic flowcharts may also be a chip, chip system, or processor that supports the device to implement the method, or may be a logic module or software that can implement all or part of the functions of the device.

[0136] For a unified explanation here, in the interaction process of the embodiment of the present application, the message or signaling interaction involved can adopt the message or signaling in the standard, or it can be a newly introduced message or signaling, and the embodiment of the present application does not make specific limitations on this.

[0137] Figure 5 This is a flow chart of a communication method provided in an embodiment of the present application. It can be understood that Figure 5 The terminal device in can be Figure 2 Any terminal device in the source access network can also refer to a device in the terminal device (such as a processor, chip, or chip system). Figure 2 Any gNB in ​​the above can also refer to a device in the access network equipment (such as a processor, chip, or chip system, etc.). Figure 5 As shown, the method includes the following steps:

[0138] S510 , the source access network device sends CHO configuration information to the terminal device. Correspondingly, the terminal device receives the CHO configuration information. The CHO configuration information is used to configure neighboring cells and CHO measurement events of the terminal device.

[0139] Optionally, the terminal device can obtain the CHO configuration information sent by the source access network device when accessing the source cell, or the terminal device can also obtain the CHO configuration information sent by the source access network device when the quality of the source cell is poor and needs to be replaced with a better quality service cell.

[0140] The neighboring cells of the terminal device configured by the CHO configuration information are candidate cells for the terminal device to perform CHO.

[0141] The CHO measurement event configured in the CHO configuration information refers to an event that triggers the terminal device to perform CHO, and may include a first event and / or a second event.

[0142] Optionally, the first event includes an event related to an increase in the angle difference of the service cell of the terminal device. For example, in one implementation, the first event is that the angle difference of the service cell of the terminal device is greater than or equal to a preset threshold value 1. In another implementation, the first event is that the angle difference of the service cell of the terminal device is greater than or equal to the preset threshold value 1, and lasts for a preset duration of 1. For example, the service 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 value 3, and lasts for a preset duration of 1, then the terminal device may be in the edge area of ​​the communication range of the source access network device, and the communication quality between the source access network devices is poor, the terminal device triggers the first event and executes CHO.

[0143] The second event includes an event related to the decrease in the angle difference of the neighboring cell of the terminal device. For example, in one implementation, the second event is that the angle difference of the neighboring cell of the terminal device is less than or equal to the preset threshold value 2. In another implementation, the second event is that the angle difference of the neighboring cell of the terminal device is less than or equal to the preset threshold value 2, and lasts for a preset duration of 2. For example, 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 the preset threshold value 2, and lasts for a preset duration of 2, then the terminal device may be in the communication range of the access network device corresponding to the neighboring cell, and the communication quality between the terminal device and the source access network device is poor, and the terminal device triggers the execution of CHO. For example, Figure 4 UE3 is within the communication range of gNB2 and the communication quality with gNB1 is poor. UE3 can trigger CHO.

[0144] The specific contents of the first event and the second event, as well as 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.

[0145] The above-mentioned preset duration 1 and / or preset duration 2 can be a preset duration or a duration configured on the network side. The preset duration 1 and the preset duration 2 can be the same or different, and are not limited.

[0146] For ease of description, the event related to the increase in the angle difference of the service cell of the terminal device will be referred to as the first threshold event, and the event related to the decrease in the angle difference of the service cell of the terminal device will be referred to as the second threshold event. The first threshold event can be replaced by a first condition event, a first measurement event, or a first switching event. The second threshold event can be replaced by a second condition event, a second measurement event, or a second switching event. In the embodiment of the present application, the names of the first threshold event and the second threshold event are not limited.

[0147] The aforementioned angle difference is the difference between the effective communication angle and the communication angle. The angle difference of the terminal device's serving cell is the difference between the first effective communication angle and the terminal device's communication angle. The first effective communication angle is the 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. The definition of the terminal device's communication angle is detailed in the technical terms above and will not be repeated here.

[0148] The angle difference of the terminal device's neighboring cell is the difference between the second effective communication angle and the terminal device's communication angle. The second effective communication angle is the angle between the line connecting any point on the communication range boundary of the access network device corresponding to the neighboring cell (also called the candidate access network device) and the access network device corresponding to the neighboring cell, and the first line.

[0149] 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, the A5 event, and so on. The event types specifically included in the CHO measurement event are configured based on the CHO configuration information, and will not be illustrated one by one in this application. Therefore, the source access network device configures the CHO measurement event in the CHO configuration information in advance, and the terminal device evaluates whether the CHO measurement event is met and performs CHO switching when the CHO measurement event is met, thereby reducing the delay in the switching decision and helping to improve the efficiency of conditional switching.

[0150] In the embodiment of the present application, after receiving the CHO configuration information from the source access network device, the terminal device determines whether the CHO triggering condition is met based on the measurement event included in the CHO configuration information. If the CHO triggering condition is met, the terminal device executes CHO.

[0151] In an embodiment of the present application, the source access network device and the access network device corresponding to the neighboring cell can be deployed on the same satellite, or the source access network device and the access network device corresponding to the neighboring cell can be deployed on different satellites, depending on the actual scenario and is not limited here.

[0152] For example, medium-orbit satellites have a larger coverage area, and different access network equipment can be deployed on the same satellite, which helps reduce signal transmission delays between satellites and improve communication efficiency. For low-orbit satellites, due to their faster speeds, the coverage area of ​​a single satellite is smaller. Therefore, different access network equipment can be deployed on different satellites, enabling global coverage through the coordinated operation of multiple satellites.

[0153] Optionally, the source access network device may send a radio resource control (RRC) reconfiguration message to the terminal device, where the RRC reconfiguration message includes the CHO configuration information. Upon receiving the RRC reconfiguration message, the terminal device may obtain the CHO configuration information.

[0154] S520: The terminal device executes CHO according to the CHO configuration information when the first event and / or the second event is triggered.

[0155] According to the CHO configuration information, the terminal device executes the CHO switching solution and switches from the source cell to the target cell when the first event and / or the second event is triggered. The process of the terminal device executing CHO can be referred to the above description and will not be described in detail here.

[0156] Optionally, in a case where the CHO measurement event configured in the CHO configuration information includes a 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, the first event is triggered, the terminal device performs CHO. In a case where the CHO measurement event configured in the CHO configuration information includes a second event, the terminal device measures whether the second event is satisfied to determine whether the second event is triggered. In a case where the terminal device determines that the second event is satisfied, that is, the second event is triggered, the terminal device performs CHO. In a case where the CHO measurement event configured in the CHO configuration information includes a first event and a 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. In a case where the terminal device determines that the first event and the second event are satisfied, that is, both the first event and the second event are triggered, the terminal device performs CHO.

[0157] For example, assuming that the first event is that the angle difference of the service cell of the terminal device is greater than the preset threshold 1 and lasts for a period of time 1, the terminal device determines that the angle difference of the service cell is greater than the preset threshold 1 and lasts for a period of time 1, the terminal device determines that the first event is met, the first event is triggered, and the terminal device executes CHO.

[0158] The terminal device uses CHO to switch cells, allowing the terminal device to trigger switching by itself when specific conditions are met (for example, the first event and / or the second event is triggered), thereby reducing the delay of waiting for the network switching command.

[0159] In the communication method provided in an embodiment of the present application, when a terminal device is configured with CHO configuration information and the measurement event included in the CHO configuration information includes a first event and / or a second event, the terminal device may perform CHO upon determining that the first event and / or the second event are triggered. Because the terminal device considers the altitude of the terminal device based on the angular difference between the terminal device's serving cell and the neighboring cell when determining whether the CHO measurement event is triggered, this allows the terminal device to switch cells in a timely manner when communication quality deteriorates due to a change in the terminal device's altitude, thereby improving communication quality.

[0160] The following describes in detail the specific content of the first event and the triggering conditions that are met when the first event is triggered. Specifically, it includes the following situations:

[0161] Case 1: The first event includes a first threshold event.

[0162] When the terminal device determines that the entry condition of the first threshold event is met, the entry condition of the first event is considered to be met. When the terminal device determines that the exit condition of the first threshold event is met, the exit condition of the first event is considered to be 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.

[0163] It should be noted that the entry conditions in this application can also be replaced by descriptions of trigger conditions, start conditions, starting conditions, etc., and the exit conditions can also be replaced by descriptions of termination conditions or end conditions, etc.

[0164] In one implementation manner 1 in this case, the entry condition and / or exit condition of the first threshold event is related to the first angle threshold and the first ratio parameter. The entry condition and exit condition of the first threshold event may be as follows:

[0165] 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 product value is greater than or equal to the first angle threshold.

[0166] The exit 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 product value is less than the first angle threshold.

[0167] The first product value is the product of the first ratio parameter and the first effective communication angle. The first effective communication angle is the angle between the first line and 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.

[0168] The first ratio parameter mentioned above can be replaced by a first angle ratio parameter or a first event ratio parameter, etc. The first angle threshold can be replaced by a first threshold, a first preset threshold or an angle threshold 1, etc.

[0169] The first ratio 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 and received by the terminal device may include the first angle threshold and the first ratio parameter. Thus, by configuring the first angle threshold and the first ratio parameter on the source access network device, the terminal device can directly measure whether the first event has been triggered based on the first angle threshold and the first ratio parameter. When the terminal device determines that the first event has been triggered, CHO is directly executed, reducing the delay in waiting for the network switching command.

[0170] For example, assume that the first threshold event (Event XX1) occurs when the communication angle of the terminal device in the serving cell is greater than or equal to angle threshold 2. The angle difference of the terminal device's serving cell 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 first effective communication angle described above); Mr is the communication angle of the terminal device relative to the source access network device, i.e., the angle measured between the terminal device and the center of the communication range relative to the source access network device, with the source access network device as the vertex; Sca is the scale parameter of the first event (i.e., the first scale parameter), which is greater than 0 and less than 1; Thresh is the threshold parameter of the first event (i.e., the first angle threshold); Md, Mv, Mr, and Thresh are all expressed in degrees; Sca has no unit. When the terminal device determines that the following condition XX1-1-1 is met, the entry condition of Event XX1 is considered met. When the terminal device determines that the following condition XX1-2-1 is met, the exit condition of Event XX1 is considered met.

[0171] Condition XX1-1-1 (i.e. entry condition) is: Md – Sca × Mv Thresh;

[0172] Condition XX1-2-1 (i.e., the leaving condition) is: Md + Sca × Mv <Thresh;

[0173] Assuming that the service cell of the terminal device is cell 1, the terminal device receives the CHO configuration information sent by the source access network device corresponding to cell 1, and the configured CHO measurement event includes 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 met, and 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 exit condition of the first event is not met. In this case, the terminal device determines that the first event is met, that is, the first event is triggered, and the terminal device executes CHO.

[0174] In this implementation, when the terminal device is moving, 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 exit condition of the first event changes 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 terminal device cannot switch in time due to signal quality fluctuations due to changes in the altitude of the terminal device (for example, in mountainous areas), but also avoids frequent switching due to changes in the altitude of the terminal device by setting an angle threshold, thereby improving the accuracy of terminal device triggering, and improving communication quality and user experience.

[0175] In an implementation manner 2 in this case, the entry condition and / or exit condition of the first threshold event is related to the third angle threshold and the first hysteresis parameter. The entry condition and exit condition of the first threshold event may be as follows:

[0176] 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 a third angle threshold.

[0177] The exit 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 a third angle threshold.

[0178] The first hysteresis parameter can be replaced by the hysteresis parameter of the first event or hysteresis parameter 1, etc. The third angle threshold can be replaced by the third threshold, the third preset threshold or the angle threshold 3, etc.

[0179] 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 and received by the terminal device may include the first hysteresis parameter and the third angle threshold. This shows that by configuring the first hysteresis parameter and the third angle threshold on the source access network device, the terminal device can directly measure whether the first event has been triggered based on the first hysteresis parameter and the third angle threshold. When the terminal device determines that the first event has been triggered, CHO is directly executed, reducing the delay in waiting for the network handover command.

[0180] For example, 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 angle threshold 2. When the terminal device determines that the following condition XX1-1-2 is met, the entry condition of Event XX1 is considered to be met. When the terminal device determines that the following condition XX1-2-2 is met, the exit condition of Event XX1 is considered to be met.

[0181] Condition XX1-1-2 (i.e. entry condition) is: Md – Hys Thresh;Md=Mv–Mr;

[0182] Condition XX1-2-2 (i.e., leaving condition) is: Md + Hys <Thresh;Md=Mv–Mr;

[0183] Among them, Md, Mv and Mr can refer to the specific introduction in the implementation method 1 in the above situation, which will not be repeated here; Hys is the hysteresis parameter of the first event; Thresh is the threshold parameter of the first event (that is, the third angle threshold).

[0184] In this implementation, when the terminal device determines whether the first event is triggered, the communication angle and effective communication angle between the terminal device and the source access network device are taken into account. This not only avoids the situation where the terminal device cannot switch in time due to fluctuations in signal quality due to changes in the altitude of the terminal device (for example, in mountainous areas), but also avoids frequent switching due to changes in the altitude of the terminal device by setting an angle threshold, thereby improving the accuracy of the terminal device in triggering the execution of CHO, and improving the communication quality and user experience.

[0185] 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.

[0186] It should be understood that the first event can be any of the A3 event, the A4 event, and the A5 event, as well as a combination of the first threshold event. In this case, the terminal device's evaluation of whether the first event is triggered may include: the terminal device determining 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, the first event is triggered. For example, assuming that the first event includes the A3 event and the first threshold event, the first event is triggered when the terminal device determines that both the A3 event and the first threshold event are satisfied.

[0187] 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, if 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, if the terminal device determines that both the A3 event and the first threshold event are not satisfied, the first event is also not triggered.

[0188] Optionally, in the second case, the specific content of the first event and the triggering conditions satisfied when the first event is triggered may include the following implementations:

[0189] Implementation method 1: The first event includes the A3 event and the first threshold event.

[0190] 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.

[0191] In this implementation, the terminal device evaluating whether the first event is triggered may include: the terminal device determining whether an A3 event and a first threshold event are simultaneously satisfied. If the terminal device determines that both the A3 event and the first threshold event are simultaneously satisfied, the first event is triggered. If the terminal device determines that both the A3 event and the first threshold event are not simultaneously satisfied, the first event is not triggered.

[0192] 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 exit condition of the A3 event and the exit condition of the first threshold event are not satisfied, 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 exit condition of the A3 event or the exit condition of the first threshold event are satisfied, the terminal device determines that the first event is not satisfied, and the first event is not triggered.

[0193] When the terminal device determines that the entry condition of the A3 event and the entry condition of the first threshold event are met, the entry condition of the first event is considered to be met. When the terminal device determines that the exit condition of the A3 event and / or the exit condition of the first threshold event are met, the exit condition of the first event is considered to be met.

[0194] It should be understood that the first event is triggered only when the terminal device determines that the entry conditions of the first event are met. When the exit conditions of the first event are met, the switching preparation state is ended, thereby ensuring that the signal quality of the neighboring cell is stable and significantly better than the signal quality of the service cell. The conditional switching is triggered only when the communication angle of the service cell of the terminal device is greater than an angle threshold, thereby improving the stability of the switching and avoiding the situation where the terminal device frequently switches between the service cell and the neighboring cell due to a temporary improvement in the signal quality of the neighboring cell, thereby improving the communication quality and user experience.

[0195] For example, when the terminal device determines that the following conditions A3XX1-1-1 and A3XX1-2-1 are satisfied, the entry condition of the first event (Event A3XX1) is considered to be satisfied. When the terminal device determines that either 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, the exit condition of Event A3XX1 is considered to be satisfied.

[0196] Condition A3XX1-1-1 (i.e., enter condition 1): Mn + Ofn + Ocn – Hys > Mp + Ofp + Ocp +Off;

[0197] Condition A3XX1-2-1 (i.e., entering condition 2) is: Md – Sca × Mv Thresh;Md=Mv–Mr;

[0198] Condition A3XX1-3-1 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys <Mp + Ofp + Ocp + Off;

[0199] Condition A3XX1-4-1 (i.e., leaving condition 2) is: Md + Sca × Mv <Thresh;Md=Mv–Mr;

[0200] Mn is the measurement result of the neighboring cell, ignoring any offset; Ofn is the measurement object-specific offset of the neighboring cell's reference signal; Ocn is the cell-specific offset of the neighboring cell, set to zero if not configured for the neighboring cell; Mp is the measurement result of the serving cell, ignoring any misalignment; Ofp is the measurement object-specific offset of the serving cell; Ocp is the cell-specific offset of the serving cell, set to zero if not configured for the serving cell; Hys is the hysteresis parameter for the A3 event; Off is the offset parameter for the A3 event; Md, Mv, Mr, Sca, and Thresh are described in Case 1 above and are not further explained here. Mn and Mp are expressed in decibel milliwatts (dBm) when they are RSRP measurements, and in decibels (dB) when they are RSRQ and / or RS-SINR measurements. Ofn, Ocn, Hys, Ofp, Ocp, and Off are expressed in dB.

[0201] For example, when the terminal device determines that the following conditions A3XX1-1-2 and A3XX1-2-2 are satisfied, the entry condition of the first event (Event A3XX1) is considered to be satisfied. When the terminal device determines that either 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, the exit condition of Event A3XX1 is considered to be satisfied.

[0202] Condition A3XX1-1-2 (i.e., entering condition 1) is: Mn + Ofn + Ocn – Hys1>Mp + Ofp + Ocp +Off;

[0203] Condition A3XX1-2-2 (i.e., entering condition 2) is: Md – Hys2 Thresh;Md=Mv–Mr;

[0204] Condition A3XX1-3-2 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys1 <Mp + Ofp + Ocp +Off;

[0205] Condition A3XX1-4-2 (i.e. leaving condition 2) is: Md + Hys2 <Thresh;

[0206] Among them, Mn, Ofn, Ocn, Mp, Ofp, Off and Ocp can be found in the introduction of 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 be found in the introduction of the above situation 1, which will not be repeated here.

[0207] 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, thereby avoiding the situation where the terminal device cannot switch in time due to fluctuations in signal quality due to changes in the altitude of the terminal device (for example, in mountainous areas or high-rise building areas), and ensures that the terminal device switches to a neighboring cell with better signal quality, thereby improving communication quality and user experience.

[0208] Implementation method 2: The first event includes the A4 event and the first threshold event.

[0209] Optionally, the first event may refer to that the signal quality of the neighboring cell of the terminal device is higher than a first threshold, and the communication angle of the terminal device in the serving cell is greater than or equal to a second threshold.

[0210] The first threshold and the 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 switching due to signal fluctuations or altitude fluctuations of the terminal device.

[0211] In this implementation, the terminal device evaluates whether the first event is triggered. For details, see the first implementation in which the first event includes the A3 event and the first threshold event, which will not be described again here.

[0212] When the terminal device determines that the entry condition of the A4 event and the entry condition of the first threshold event are met, the entry condition of the first event is considered to be met. When the terminal device determines that the exit condition of the A4 event and / or the exit condition of the first threshold event are met, the exit condition of the first event is considered to be met.

[0213] For example, when the terminal device determines that the following conditions A4XX1-1-1 and A4XX1-2-1 are satisfied, the entry condition of the first event (Event A4XX1) is considered to be satisfied. When the terminal device determines that either 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, the exit condition of Event A4XX1 is considered to be satisfied.

[0214] Condition A4XX1-1-1 (i.e., entering condition 1) is: Mn + Ofn + Ocn – Hys>Thresh1;

[0215] Condition A4XX1-2-1 (i.e., entering condition 2) is: Md – Sca × Mv Thresh2;Md=Mv–Mr;

[0216] Condition A4XX1-3-1 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys <Thresh1;

[0217] Condition A4XX1-4-1 (i.e., leaving condition 2) is: Md + Sca × Mv <Thresh2;Md=Mv–Mr;

[0218] The details of Mn, Ofn, Ocn, Md, Mv, Mr, and Sca can be found in Implementation Method 1 above and are not repeated here. Hys is the hysteresis parameter for the A4 event, Off is the offset parameter for the A4 event, Thresh1 and Thresh2 are the threshold parameters for the first event, Thresh1 being the first threshold and Thresh2 being the second threshold (which can be the first angle threshold described above). The units of Thresh1 are the same as those of Mn, while the units of Thresh2 are degrees.

[0219] Still taking terminal equipment as the above Figure 4 Taking UE3 in the 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 A4XX1-2-1 are met, and the first event is triggered.

[0220] For another example, when the terminal device determines that the following conditions A4XX1-1-2 and A4XX1-2-2 are satisfied, the entry condition of the first event (Event A4XX1) is considered to be satisfied. When the terminal device determines that either 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, the exit condition of Event A4XX1 is considered to be satisfied.

[0221] Condition A4XX1-1-2 (i.e., entering condition 1) is: Mn + Ofn + Ocn – Hys1>Thresh1;

[0222] Condition A4XX1-2-2 (i.e., entering condition 2) is: Md – Hys2 Thres,2;Md=Mv–Mr;

[0223] Condition A4XX1-3-2 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys1 <Thresh1;

[0224] Condition A4XX1-4-2 (i.e. leaving condition 2) is: Md + Hys 2 <Thresh2;Md=Mv–Mr;

[0225] The details of Mn, Ofn, Ocn, Hys1, Md, Hys2, Mv, and Mr can be found in Implementation 1 above and are not repeated here. Thresh1 and Thresh2 are the threshold parameters for the first event. Thresh1 is the first threshold, and Thresh2 is the second threshold (which can be the third angle threshold described above). The unit of Thresh1 is the same as that of Mn, and the unit of Thresh2 is degrees.

[0226] 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 in the service cell. This not only avoids frequent switching due to fluctuations in the cell signal 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.

[0227] Implementation method three: the first event includes the A5 event and the first threshold event.

[0228] Optionally, the first event includes that the signal quality of the terminal device's service cell 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 service cell is greater than or equal to a fifth threshold.

[0229] The third, fourth, and fifth thresholds are in the CHO configuration information configured by the source access network device and can be adjusted according to the actual application scenario. Here, the signal quality of the serving cell must be lower than the third threshold, and the signal quality of the neighboring cell must be higher than the fourth threshold to avoid frequent handovers due to signal fluctuations and ensure handover to a cell with better signal quality.

[0230] In this implementation, the terminal device evaluates whether the first event is triggered. For details, see the first implementation in which the first event includes the A3 event and the first threshold event, which will not be described again here.

[0231] When the terminal device determines that the entry condition of the A5 event and the entry condition of the first threshold event are met, the entry condition of the first event is considered to be met. When the terminal device determines that the exit condition of the A5 event and / or the exit condition of the first threshold event are met, the exit condition of the first event is considered to be met.

[0232] For example, when the terminal device determines that the following conditions A5XX1-1-1, A5XX1-2-1, and A5XX1-3-1 are satisfied, the entry condition of the first event (Event A5XX1) is considered satisfied. When the terminal device determines that condition A5XX1-4-1, A5XX1-5-1, or A5XX1-6-1 is satisfied, that is, at least one of exit conditions 1 to 3 is satisfied, the exit condition of Event A5XX1 is considered satisfied.

[0233] Condition A5XX1-1-1 (i.e., entering condition 1) is: Mp + Hys <Thresh1;

[0234] Condition A5XX1-2-1 (i.e., entering condition 2) is: Mn + Ofn + Ocn – Hys>Thresh2;

[0235] Condition A5XX1-3-1 (i.e., entering condition 3) is: Md – Sca × Mv Thresh3;Md=Mv–Mr;

[0236] Condition A5XX1-4-1 (i.e., leaving condition 1) is: Mp - Hys>Thresh1;

[0237] Condition A5XX1-5-1 (i.e. leaving condition 2) is: Mn + Ofn + Ocn + Hys <Thresh2;

[0238] Condition A5XX1-6-1 (i.e., leaving condition 3) is: Md + Sca × Mv <Thresh3;Md=Mv–Mr;

[0239] Mp, Mn, Ofn, Ocn, Md, Mv, Mr, and Sca are described in Implementation Method 1 above and are not repeated here. Hys is the hysteresis parameter for the A5 event. Thresh1, Thresh2, and Thresh3 are the threshold parameters for the first event. Thresh1 is the third threshold, Thresh2 is the fourth threshold, and Thresh3 is the fifth threshold (which can be the first angle threshold described 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.

[0240] Still taking terminal equipment as the above Figure 4Taking UE3 in the 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 at gNB1 is greater than or equal to the fifth threshold. That is, the above conditions A5XX1-1-1, A5XX1-2-1 and A5XX1-3-1 are met at the same time. The first event is triggered, and the terminal device triggers the execution of CHO.

[0241] For example, when the terminal device determines that the following conditions A5XX1-1-2, A5XX1-2-2, and A5XX1-3-2 are satisfied, the entry condition of the first event (Event A5XX1) is considered to be satisfied. When the terminal device determines that condition A5XX1-4-2, condition A5XX1-5-2, or condition A5XX1-6-2 is satisfied, that is, at least one of exit conditions 1 to 3 is satisfied, the exit condition of Event A5XX1 is considered to be satisfied.

[0242] Condition A5XX1-1-2 (i.e., entering condition 1) is: Mp + Hys1 <Thresh1;

[0243] Condition A5XX1-2-2 (i.e., entering condition 2) is: Mn + Ofn + Ocn – Hys1>Thresh2;

[0244] Condition A5XX1-3-2 (i.e., entering condition 3) is: Md – Hys2 Thresh3;Md=Mv–Mr;

[0245] Condition A5XX1-4-2 (i.e., leaving condition 1) is: Mp – Hys1>Thresh1;

[0246] Condition A5XX1-5-2 (i.e. leaving condition 2) is: Mn + Ofn + Ocn + Hys1 <Thresh2;

[0247] Condition A5XX1-6-2 (i.e. leaving condition 3) is: Md + Hys2 <Thresh3;Md=Mv–Mr;

[0248] Mp, Mn, Ofn, Ocn, Md, Mv, and Mr are described in Implementation Method 1 above and are not repeated here. Hys1 is the hysteresis parameter for the A5 event, and Hys2 is the hysteresis parameter for the first event. Thresh1, Thresh2, and Thresh3 are the threshold parameters for the first event. Thresh1 is the third threshold, Thresh2 is the fourth threshold, and Thresh3 is the fifth threshold (which can be the third angle threshold described above).

[0249] In this implementation, 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 makes a multi-dimensional decision on whether to trigger the first event, thereby ensuring the accuracy of the switching decision. By setting multiple threshold values, it not only avoids frequent switching due to 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 communication quality and user experience.

[0250] The following details the specific content of the second event and the triggering conditions that are met when the second event is triggered. Specifically, it includes the following situations:

[0251] Case 1: The second event includes a second threshold event.

[0252] When the terminal device determines that the entry condition of the second threshold event is met, the entry condition of the second event is considered to be met. When the terminal device determines that the exit condition of the second threshold event is met, the exit condition of the second event is considered to be met. If the terminal device determines that the second event is not met, the second event is not triggered. Optionally, if the terminal device determines that the entry condition of the second event is met and / or the exit condition of the second event is not met, the terminal device determines that the second event is met, and the second event is triggered. If the terminal device determines that the entry condition of the second event is not met and / or the exit condition of the second event is met, the terminal device determines that the second event is not met, and the second event is not triggered.

[0253] In an implementation manner 1 of the first case, the entry condition and / or exit condition of the second threshold event is related to the second angle threshold and the second ratio parameter. The entry condition and exit condition of the second threshold event may be as follows:

[0254] 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.

[0255] The exit condition of the second threshold event may include: 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.

[0256] The second product value may be a product value of the second ratio parameter and a second effective communication angle. The second effective communication angle is the angle between a 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.

[0257] The second ratio parameter can be replaced by a second angle ratio parameter or a second event ratio parameter, etc. The second angle threshold can be replaced by a second threshold, a second preset threshold or an angle threshold 2, etc.

[0258] Similarly, the second ratio parameter and the second 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 and received by the terminal device may include the second angle threshold and the second ratio parameter. This shows that by configuring the second angle threshold and the second ratio parameter on the source access network device, the terminal device can directly measure whether the second event has been triggered based on the second angle threshold and the second ratio parameter. When the terminal device determines that the second event has been triggered, CHO is directly executed, reducing the delay in waiting for the network switching command.

[0259] For example, when the terminal device satisfies the following condition XX2-1, the entry condition of the second event (Event XX2) is considered to be satisfied. When the terminal device satisfies the following condition XX2-2, the exit condition of Event XX2 is considered to be satisfied.

[0260] Condition XX2-1 (i.e. entry condition) is: Md + Sca × Mv Thresh;

[0261] Condition XX2-2 (i.e., the leaving condition) is: Md - Sca × Mv>Thresh;

[0262] Among them, Md is the angle difference of the service 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 scale parameter of the second event (i.e., the second scale parameter), which 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.

[0263] Still based on terminal equipment Figure 4 Taking UE3 in the example, when the communication angle between UE3 and gNB2 is less than the angle threshold, the first event is triggered, and UE3 can trigger the execution of CHO.

[0264] In this implementation, when the terminal device is moving, 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 exit condition of the second event change with the communication angle and 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 terminal device cannot switch in time due to signal quality fluctuations (for example, in mountainous areas) due to changes in the altitude of the terminal device, but also avoids frequent switching due to changes in the altitude of the terminal device by setting an angle threshold, thereby improving the accuracy of the terminal device in triggering the execution of CHO, and improving the communication quality and user experience.

[0265] In an implementation manner 2 of the first case, the entry condition and / or exit condition of the second threshold event is related to the fourth angle threshold and the second hysteresis parameter. The entry condition and exit condition of the second threshold event may be as follows:

[0266] 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.

[0267] The exit 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.

[0268] The second hysteresis parameter can be replaced by the hysteresis parameter of the second event or hysteresis parameter 2, etc. The fourth angle threshold can be replaced by the fourth threshold, the fourth preset threshold or the angle threshold 4, etc.

[0269] The second hysteresis parameter and the fourth angle threshold may be configured based on the source access network device. Optionally, the CHO configuration information sent by the source access network device and received by the terminal device may include the second hysteresis parameter and the fourth angle threshold.

[0270] For example, 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 conditions XX2-1-2 are met, the entry condition of Event XX2 is considered to be met. When the terminal device determines that the following conditions XX2-2-2 are met, the exit condition of Event XX2 is considered to be met.

[0271] Condition XX2-1-2 (i.e. entry condition) is: Md + Hys Thresh;Md=Mv–Mr;

[0272] Condition XX2-2-2 (i.e., leaving condition) is: Md – Hys>Thresh; Md=Mv–Mr;

[0273] Among them, Md, Mv and Mr can refer to the specific introduction in one implementation method 1 in the above situation 1, which will not be repeated here; Hys is the hysteresis parameter of the second event; Thresh is the threshold parameter of the second event (that is, the fourth angle threshold).

[0274] In this implementation, the terminal device determines whether to trigger the second event by monitoring the communication angle between the terminal device and the access network device of the neighboring cell, ensuring that the cell can be switched in time when the altitude of the terminal device changes, which is conducive to improving communication quality and user experience.

[0275] The second case: the second event includes any one of the A3 event, the A4 event, and the A5 event, and the second threshold event.

[0276] It should be understood that the second event can be any of the A3 event, the A4 event, and the A5 event, as well as a combination of the second threshold event. In this case, the terminal device can evaluate whether the second event is triggered by referring to the specific implementation of the terminal device evaluating whether the first event is triggered in the above-mentioned scenario 2, which is not repeated here.

[0277] Optionally, in the second case, the specific content included in the second event and the triggering conditions satisfied when the second event is triggered may include the following implementations:

[0278] A first implementation method: the second event includes an A3 event and a second threshold event related to a decrease in the angle difference between the neighboring cells of the terminal device.

[0279] Optionally, the second 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 an offset, and the communication angle of the neighboring cell of the terminal device is less than or equal to an angle threshold.

[0280] In this implementation, the terminal device's evaluation of whether the second event is triggered may include: the terminal device determining whether the A3 event and the second threshold event are simultaneously satisfied. If the terminal device determines that the A3 event and the second threshold event are simultaneously satisfied, the second event is triggered. If the terminal device determines that the A3 event and the second threshold event are not simultaneously satisfied, the second event is not triggered. Optionally, if the terminal device determines that the entry condition of the A3 event and the entry condition of the second threshold event are simultaneously satisfied, and / or, the exit condition of the A3 event and the exit condition of 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 condition of the A3 event and the second threshold event are not simultaneously satisfied, and / or, the exit condition of the A3 event or the exit condition of the second threshold event are satisfied, the terminal device determines that the second event is not satisfied, and the second event is not triggered.

[0281] When the terminal device determines that the entry condition of the A3 event and the entry condition of the second threshold event are met, the entry condition of the second event is considered to be met. When the terminal device determines that the exit condition of the A3 event and / or the exit condition of the second threshold event are met, the exit condition of the second event is considered to be met.

[0282] For example, when the terminal device determines that the following conditions A3XX2-1-1 and A3XX2-2-1 are satisfied, the entry condition of the second event (Event A3XX2) is considered satisfied. When the terminal device determines that either 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, the exit condition of Event A3XX2 is considered satisfied.

[0283] Condition A3XX2-1-1 (i.e., enter condition 1): Mn + Ofn + Ocn – Hys > Mp + Ofp + Ocp +Off;

[0284] Condition A3XX2-2-1 (i.e., entering condition 2) is: Md + Sca × Mv Thresh;Md=Mv–Mr;

[0285] Condition A3XX2-3-1 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys <Mp + Ofp + Ocp + Off;

[0286] Condition A3XX2-4-1 (i.e., leaving condition 2) is: Md – Sca × Mv>Thresh; Md=Mv–Mr;

[0287] Among them, Mp, Mn, Ofn, Ocn, Hys, Md, Mv and Mr can refer to the introduction of the implementation method 1 corresponding to the first event above, and will not be repeated here. Sca is the second proportion parameter, and Thresh is the second angle threshold.

[0288] The terminal device is the above Figure 4 For example, UE3 compares the signal quality of gNB2 with the signal quality of gNB1 plus an offset and determines that gNB2 has better signal quality, thus satisfying entry condition 1. Furthermore, the communication angle between UE3 and gNB2 is greater than the set angle threshold, thus satisfying entry condition 2. In this case, the second event is triggered, i.e., the terminal device triggers CHO.

[0289] For another example, when the terminal device determines that the following conditions A3XX2-1-2 and A3XX2-2-2 are satisfied, the entry condition of the second event (Event A3XX2) is considered to be satisfied. When the terminal device determines that either condition A3XX2-3-2 or condition A3XX2-4-2 is satisfied, that is, when at least one of condition A3XX2-3-2 and condition A3XX2-4-2 is satisfied, the exit condition of Event A3XX2 is considered to be satisfied.

[0290] Condition A3XX2-1-2 (i.e., entering condition 1) is: Mn + Ofn + Ocn – Hys1>Mp + Ofp + Ocp +Off;

[0291] Condition A3XX2-2-2 (i.e., entering condition 2) is: Md + Hys2 Thresh;Md=Mv–Mr;

[0292] Condition A3XX2-3-2 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys1 <Mp + Ofp + Ocp +Off;

[0293] Condition A3XX2-4-2 (i.e., leaving condition 2) is: Md – Hys2>Thresh; Md=Mv–Mr;

[0294] Among them, Mp, Mn, Ofn, Ocn, Md, Mv and Mr can be found in the introduction of the implementation method 1 corresponding to the first event above, and will not be repeated 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).

[0295] In this implementation, 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, thereby avoiding the situation where the signal quality fluctuates due to changes in the altitude of the terminal device and the terminal device cannot switch in time, and ensures that the terminal device switches to a cell with better signal quality, thereby improving the communication quality and user experience.

[0296] Second implementation manner: the second event includes the A4 event and the second threshold event.

[0297] Optionally, the second event may refer to that the signal quality of the 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.

[0298] In this implementation, the terminal device evaluates whether the second event is triggered. For details, see the case in the first implementation described above where the second event includes the A3 event and the second threshold event, which will not be described again here.

[0299] When the terminal device determines that the entry condition of the A4 event and the entry condition of the second threshold event are met, the entry condition of the second event is considered to be met. When the terminal device determines that the exit condition of the A4 event and / or the exit condition of the second threshold event are met, the exit condition of the second event is considered to be met.

[0300] For example, when the terminal device determines that the following conditions A4XX2-1-1 and A4XX2-2-1 are satisfied, the entry condition of the second event (Event A4XX2) is considered to be satisfied. When the terminal device determines that either 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, the exit condition of Event A4XX2 is considered to be satisfied.

[0301] Condition A4XX2-1-1 (i.e., entering condition 1) is: Mn + Ofn + Ocn – Hys>Thresh1;

[0302] Condition A4XX2-2-1 (i.e., entering condition 2) is: Md + Sca × Mv Thresh2;Md=Mv–Mr;

[0303] Condition A4XX2-3-1 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys <Thresh1;

[0304] Condition A4XX2-4-1 (i.e., leaving condition 2) is: Md – Sca × Mv>Thresh2; Md=Mv–Mr;

[0305] The details of Mn, Ofn, Ocn, Md, Mv, Mr, and Sca can be found in the first implementation above and are not repeated here. Hys is the hysteresis parameter for the A4 event, Thresh1 and Thresh2 are the threshold parameters for the second event, Thresh1 being the sixth threshold and Thresh2 being the seventh threshold (which can be the second angle threshold). The units of Thresh1 are the same as those of Mn, while the units of Thresh2 are degrees.

[0306] Still taking terminal equipment as the above Figure 4Taking UE3 in the example, UE3 determines that the signal quality of gNB2 is higher than the sixth threshold, and the communication angle of UE3 at gNB2 is less than the seventh threshold. That is, the above conditions A4XX2-1-1 and A4XX2-2-1 are met, and the second event is triggered, that is, the terminal device triggers the execution of CHO.

[0307] For another example, when the terminal device determines that the following conditions A4XX2-1-2 and A4XX2-2-2 are satisfied, the entry condition of the second event (Event A4XX2) is considered to be satisfied. When the terminal device determines that either 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, the exit condition of Event A4XX2 is considered to be satisfied.

[0308] Condition A4XX2-1-2 (i.e., entering condition 1) is: Mn + Ofn + Ocn – Hys1>Thresh1;

[0309] Condition A4XX2-2-2 (i.e., entering condition 2) is: Md + Hys2 Thresh2;Md=Mv–Mr;

[0310] Condition A4XX2-3-2 (i.e. leaving condition 1) is: Mn + Ofn + Ocn+Hys1 <Thresh1;

[0311] Condition A4XX2-4-2 (i.e., leaving condition 2) is: Md – Hys2>Thresh2; Md=Mv–Mr;

[0312] The details of Mn, Ofn, Ocn, Md, Mv, and Mr can be found in the first implementation above and are not repeated here. Hys1 is the hysteresis parameter for the A4 event, Hys2 is the hysteresis parameter for the second event, Thresh1 and Thresh2 are the threshold parameters for the second event, Thresh1 is the sixth threshold, and Thresh2 is the seventh threshold (which can be the fourth angle threshold mentioned above). The unit of Thresh1 is the same as that of Mn, and the unit of Thresh2 is degrees.

[0313] In this implementation, 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 in the neighboring cell. This not only avoids frequent switching due to fluctuations in the cell signal 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.

[0314] A third implementation method: the second event includes an A5 event and a second threshold event related to a decrease in the angle difference between the terminal device and the neighboring cell.

[0315] Optionally, the second event includes that the signal quality of the terminal device's service cell is lower than an eighth threshold, and the signal quality of the neighboring cell is higher than a ninth threshold, and the communication angle of the terminal device in the neighboring cell is greater than or equal to a tenth threshold.

[0316] In this implementation, the terminal device evaluates whether the second event is triggered. For details, see the case in the first implementation described above where the second event includes the A3 event and the second threshold event, which will not be described again here.

[0317] When the terminal device determines that the entry condition of the A5 event and the entry condition of the second threshold event are met, the entry condition of the second event is considered to be met. When the terminal device determines that the exit condition of the A5 event and / or the exit condition of the second threshold event are met, the exit condition of the second event is considered to be met.

[0318] For example, when the terminal device determines that the following conditions A5XX2-1-1, A5XX2-2-1, and A5XX2-3-1 are satisfied, the entry condition of the second event (Event A5XX2) is considered to be satisfied. When the terminal device determines that condition A5XX2-4-1, condition A5XX2-5-1, or condition A5XX2-6-1 is satisfied, that is, when at least one of the following exit conditions 1 to 3 is satisfied, the exit condition of Event A5XX2 is considered to be satisfied.

[0319] Condition A5XX2-1-1 (i.e., entering condition 1) is: Mp + Hys <Thresh1;

[0320] Condition A5XX2-2-1 (i.e., entering condition 2) is: Mn + Ofn + Ocn – Hys>Thresh2;

[0321] Condition A5XX2-3-1 (i.e., entering condition 3) is: Md+Sca × Mv Thresh3;Md=Mv–Mr;

[0322] Condition A5XX2-4-1 (i.e., leaving condition 1) is: Mp - Hys>Thresh1;

[0323] Condition A5XX2-5-1 (i.e. leaving condition 2) is: Mn + Ofn + Ocn + Hys <Thresh2;

[0324] Condition A5XX2-6-1 (i.e., leaving condition 3) is: Md - Sca × Mv>Thresh3; Md=Mv–Mr;

[0325] Mp, Mn, Ofn, Ocn, Md, Mv, Mr, and Sca are described in the first implementation above and are not repeated here. Hys is the hysteresis parameter for the A5 event. Thresh1, Thresh2, and Thresh3 are the threshold parameters for 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 second angle threshold described 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.

[0326] Still taking terminal equipment as the above Figure 4 Taking UE3 in the 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 at gNB2 is less than the tenth threshold. That is, the above conditions A5XX1-1-1, A5XX1-2-1 and A5XX1-3-1 are met at the same time. The second event is triggered, and the terminal device triggers the execution of CHO.

[0327] For example, when the terminal device determines that the following conditions A5XX2-1-2, A5XX2-2-2, and A5XX2-3-2 are satisfied, the entry condition of the second event (Event A5XX2) is considered to be satisfied. When the terminal device determines that condition A5XX2-4-2, condition A5XX2-5-2, or condition A5XX2-6-2 is satisfied, that is, when at least one of the following exit conditions 1 to 3 is satisfied, the exit condition of Event A5XX2 is considered to be satisfied.

[0328] Condition A5XX2-1-2 (i.e., entering condition 1) is: Mp + Hys1 <Thresh1;

[0329] Condition A5XX2-2-2 (i.e., entering condition 2) is: Mn + Ofn + Ocn – Hys1>Thresh2;

[0330] Condition A5XX2-3-2 (i.e. entering condition 3) is: Md + Hys2 Thresh3;Md=Mv–Mr;

[0331] Condition A5XX2-4-2 (i.e., leaving condition 1) is: Mp – Hys1>Thresh1;

[0332] Condition A5XX2-5-2 (i.e. leaving condition 2) is: Mn + Ofn + Ocn + Hys1 <Thresh2;

[0333] Condition A5XX2-6-2 (i.e., leaving condition 3) is: Md – Hys2>Thresh3; Md=Mv–Mr;

[0334] Mp, Mn, Ofn, Ocn, Md, Mv, and Mr can be found in the description of the first implementation above and are not repeated here. Hys1 is the hysteresis parameter for the A5 event, Hys2 is the hysteresis parameter for the second event, Thresh1, Thresh2, and Thresh3 are the threshold parameters for 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 described 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.

[0335] In this implementation, 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, thereby ensuring the accuracy of the switching decision. By setting multiple threshold values, it not only avoids frequent switching due to 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 communication quality and user experience.

[0336] The signaling interaction process of the communication method provided in this embodiment will be explained below through a specific example. Figure 6 An example diagram of a signaling interaction of the communication method provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the communication devices involved may include terminal devices and access network devices gNB, and the access network devices include source cell gNB and target cell gNB. Figure 6 As shown, the method mainly includes the following processes:

[0337] S601: A terminal device is in an RRC connected state and accesses the source cell gNB. The source cell gNB sends an RRC reconfiguration message to the terminal device, and the terminal device receives the RRC reconfiguration message.

[0338] The RRC reconfiguration message includes measurement report configuration, configuration information of neighboring cells, and CHO measurement events.

[0339] Compared with the solutions in the existing standards, 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 gNB of the source cell, as well as the communication angle between the terminal device and the gNB corresponding to the neighboring cell.

[0340] In the embodiment of the present application, the CHO measurement event includes a first event and / or a second event.

[0341] S602: The terminal device sends an RRC reconfiguration completion message to the source cell gNB. Correspondingly, the source cell gNB receives the RRC reconfiguration completion message.

[0342] S603: The terminal device measures whether the first event and / or the second event is triggered.

[0343] In an embodiment of the present application, the terminal device may determine whether the first event and / or the second event are triggered based on the specific indication of the CHO configuration information included in the RRC reconfiguration message in S601. If it is determined that the first event and / or the second event are triggered, the CHO is triggered. For a detailed description of the triggering of the first event and / or the second event, please refer to the description in the above embodiment and will not be repeated here.

[0344] When the first event and / or the second event is triggered, the terminal device determines to perform a CHO handover.

[0345] S604: The terminal device sends a handover request message to the source cell gNB. Correspondingly, the source cell gNB receives the handover request message.

[0346] The handover request message includes identification information of the target cell.

[0347] 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.

[0348] S606: The target cell gNB allows access.

[0349] 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.

[0350] S608. The source cell gNB sends an RRC reconfiguration message to the terminal device. Correspondingly, the terminal device receives the RRC reconfiguration message.

[0351] The RRC reconfiguration message includes configuration information of the target cell.

[0352] S609: The terminal device initiates a random access request to the target cell gNB. Correspondingly, the target cell gNB receives the random access request.

[0353] 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 handover.

[0354] S611: The terminal device sends an RRC reconfiguration completion message to the target cell gNB. Correspondingly, the target cell gNB receives the RRC reconfiguration completion message.

[0355] For the specific process from S604 to S611, please refer to the specific implementation of the CHO process in the existing standard, which will not be described in detail here.

[0356] It should be noted that since the terminal devices are located at different altitudes, the corresponding communication angles are also different. In the communication method of the embodiment of the present application, the terminal device takes into account the communication angle of the terminal device when measuring whether the first event and / or the second event is triggered, thereby 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 switching in time, thereby realizing timely switching of cells, which is conducive to improving communication quality.

[0357] However, in the ground scenario, Figure 7 As shown, when the terminal device determines whether to trigger CHO switching, the plane communication angle and communication height are taken into account, but the communication angle of the terminal device is not taken into account. Due to the small change in the altitude of the terminal device, the communication angles of terminal devices located on different floors are not much different, which leads to certain limitations in the solution of CHO execution of terminal devices in ground scenarios applicable to this application.

[0358] In an embodiment of the present application, when an access network device determines whether to execute LTM based on a measurement report received from a terminal device, the access network device may measure whether an LTM measurement event is satisfied. The LTM measurement event may include a first event and / or a second event. If the access network device determines that the first event and / or the second event are triggered, the access network device sends a handover instruction to the terminal device, instructing the terminal device to execute LTM.

[0359] In this application, only the specific contents included in the LTM measurement event in the existing standard are replaced with the first event and / or the second event.

[0360] For the specific implementation of the access network device measuring whether the first event and / or the second event are triggered, please refer to the specific implementation of determining whether the first event and / or the second event are triggered when the CHO measurement event includes the first event and / or the second event, which will not be described in detail here.

[0361] Therefore, when the access network device determines whether the terminal device executes LTM, the communication angle of the terminal device is taken into consideration, so that the access network device can instruct the terminal device to perform cell switching more promptly, which is conducive to improving communication quality.

[0362] It should be understood that Figures 1 to 7 The flowcharts or scenario diagrams shown are only for ease of understanding and are not intended to limit the embodiments of the present application to the examples shown in the diagrams. In fact, those skilled in the art will Figures 1 to 7 The examples in can be equivalently transformed to obtain more implementation methods.

[0363] Combined with the above Figures 1 to 7 , describes in detail the communication method provided by the embodiment of the present application. Figures 8 and 9 It should be understood that the communication device of the present invention can execute the various communication methods of the above embodiments of the present invention, that is, the specific working processes of the following various products can refer to the corresponding processes in the above method embodiments.

[0364] In each of the above embodiments, the terminal device may perform some or all of the steps in each embodiment; the network device may perform some or all of the steps in each embodiment. These steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. In addition, the various steps may be performed in a different order as presented in the embodiments, and it is possible that not all of the operations in the embodiments of the present application need to be performed. Moreover, the size of the sequence number of each step 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 on the implementation process of the embodiments of the present application.

[0365] Figure 8 A schematic block diagram of a communication device provided in an embodiment of the present application. Figure 8 As shown, the communication device 800 may include a communication module 820. The communication module 820 can implement corresponding communication functions, which may be internal communication functions of the communication device 800 or communication functions between the communication device 800 and other devices. Optionally, the communication module 820 may also be referred to as a communication interface or a transceiver module. Optionally, the communication device 800 also includes a processing module 810. The processing module 810 can implement corresponding processing functions.

[0366] 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, so that the communication device 800 implements the aforementioned method embodiment.

[0367] In one possible design, the communication device 800 may correspond to the terminal device in the above method embodiments, or a component configured in the terminal device (such as a circuit, chip, or chip system). The communication device 800 can be used to execute the steps or processes executed by the terminal device in any of the above method embodiments.

[0368] For example, the communication module 820 is used to receive conditional switching CHO configuration information from the source access network device. The CHO configuration information is used to configure the neighboring cells and CHO measurement events of the terminal device, and the CHO measurement events include a first event and / or a second event. Among them, the first event includes an event related to an increase in the angle difference of the service cell of the terminal device. The second event includes an event related to a decrease in the angle difference of the neighboring cells of the terminal device. 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 an access network device and the center point of the communication range of an access network device; the effective communication angle is the angle between the line between any point on the boundary of the communication range of an access network device and an access network device and the first line.

[0369] The processing module 810 is configured to execute CHO according to the CHO configuration information when the first event and / or the second event is triggered.

[0370] In some embodiments, the first event further includes any one of the A3 event, the A4 event, and the A5 event; and the second event includes any one of the A3 event, the A4 event, and the A5 event.

[0371] In other embodiments, 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 between the neighboring cells of the terminal device.

[0372] The exit condition of the second 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 decrease in the angle difference of the neighboring cell of the terminal device.

[0373] In some other embodiments, the entry condition and / or exit condition of the event related to the increasing angular difference between neighboring cells 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;

[0374] The entry condition and / or exit condition of the event related to the reduction of 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.

[0375] In other embodiments, the entry condition for the event related to the increase in the angle difference of the terminal device's neighboring cell includes: the difference between the angle difference of the terminal device's serving cell and a first product value is greater than or equal to a first angle threshold; wherein the first product value is the product value of the first proportional parameter and the first effective communication angle; the first effective communication angle is the 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 the first line;

[0376] The exit condition of the event related to the increase in the angle difference of the neighboring 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.

[0377] In other embodiments, the entry conditions for the event related to the decrease in the angle difference between the neighboring cells of the terminal device include:

[0378] 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;

[0379] The exit conditions for the event related to the decrease in the angle difference between the terminal device and the neighboring cell include:

[0380] 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.

[0381] In other embodiments, the entry condition of the event related to the increase in the angle difference of the terminal device's neighboring cells includes: the difference between the angle difference of the terminal device's service cell and the first lag parameter is greater than or equal to a third angle threshold; the exit condition of the event related to the increase in the angle difference of the terminal device's neighboring cells includes: the sum of the angle difference of the terminal device's service cell and the first lag parameter is less than the third angle threshold.

[0382] In other embodiments, the entry condition of the event related to the decrease in the angle difference of the terminal device's neighboring cells includes: the sum of the angle difference of the terminal device's neighboring cells and the second lag parameter is less than or equal to a fourth angle threshold; the exit condition of the event related to the decrease in the angle difference of the terminal device's neighboring cells includes: the difference between the angle difference of the terminal device's neighboring cells and the second lag parameter is greater than the fourth angle threshold.

[0383] In other embodiments, 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.

[0384] The above is only an example, and for detailed steps or processes, please refer to the description of the aforementioned embodiments.

[0385] In one possible design, the communication device 800 may correspond to the access network device in the above method embodiments, or a component (such as a circuit, chip, or chip system) 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.

[0386] For example, the communication module 820 is used to send conditional switching CHO configuration information to the terminal device; wherein, the CHO configuration information is used to configure the neighboring cells and CHO measurement events of the terminal device, 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 angle difference of the service cell of the terminal device; the second event includes an event related to a decrease in the angle difference of the neighboring cells of the terminal device; the CHO measurement event is used to determine whether to execute CHO. 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 an access network device and the center point of the communication range of an access network device; the effective communication angle is the angle between the line between any point on the boundary of the communication range of an access network device and an access network device and the first line.

[0387] In some embodiments, the first event further includes any one of the A3 event, the A4 event, and the A5 event; and the second event further includes any one of the A3 event, the A4 event, and the A5 event.

[0388] In other embodiments, 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 first threshold event.

[0389] In other embodiments, the exit condition of the second 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 decrease in the angle difference between the neighboring cells of the terminal device.

[0390] In some other embodiments, the entry condition and / or exit condition of the event related to the increasing angular difference between neighboring cells 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;

[0391] The entry condition and / or exit condition of the event related to the reduction of 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.

[0392] In other embodiments, the entry condition for the event related to the increase in the angle difference of the terminal device's neighboring cell includes: the difference between the angle difference of the terminal device's serving cell and a first product value is greater than or equal to a first angle threshold; wherein the first product value is the product value of the first proportional parameter and the first effective communication angle; the first effective communication angle is the 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 the first line;

[0393] The exit condition of the event related to the increase in the angle difference of the neighboring 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.

[0394] In other embodiments, the entry conditions for the event related to the decrease in the angle difference between the neighboring cells of the terminal device include:

[0395] 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;

[0396] The exit conditions for the event related to the decrease in the angle difference between the terminal device and the neighboring cell include:

[0397] 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.

[0398] In other embodiments, the entry condition of the event related to the increase in the angle difference of the terminal device's neighboring cells includes: the difference between the angle difference of the terminal device's service cell and the first lag parameter is greater than or equal to a third angle threshold; the exit condition of the event related to the increase in the angle difference of the terminal device's neighboring cells includes: the sum of the angle difference of the terminal device's service cell and the first lag parameter is less than the third angle threshold.

[0399] In other embodiments, the entry condition of the event related to the decrease in the angle difference of the terminal device's neighboring cells includes: the sum of the angle difference of the terminal device's neighboring cells and the second lag parameter is less than or equal to a fourth angle threshold; the exit condition of the event related to the decrease in the angle difference of the terminal device's neighboring cells includes: the difference between the angle difference of the terminal device's neighboring cells and the second lag parameter is greater than the fourth angle threshold.

[0400] In other embodiments, 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.

[0401] The above is only an example, and for detailed steps or processes, please refer to the description of the aforementioned embodiments.

[0402] Figure 9 Another schematic block diagram of a communication device provided in an embodiment of the present application. The communication device 900 can be a chip, chip system, or processor, etc., that implements the above-mentioned method in a terminal device or access network device. The communication device 900 can be used to implement the method described in the above-mentioned method embodiment. For details, please refer to the description of the above-mentioned method embodiment.

[0403] like Figure 9 As shown, the communication device 900 may include one or more processors 910, which may also be referred to as processing units or processing modules, and may implement certain control functions. The processor 910 may be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor may be used to process communication protocols and communication data, and the central processing unit may be used to control the communication device 900 (e.g., base station, baseband chip, user, user chip), execute software programs, and process software program data.

[0404] In an optional design, the processor 910 may also store instructions and / or data, which can be executed by the processor 910 to enable the communication device 900 to perform the method described in the above method embodiment.

[0405] In another optional design, the communication device 900 may include a communication interface 920 for implementing receiving and transmitting functions. For example, the communication interface 920 may be a transceiver circuit, an interface, an interface circuit, or a transceiver. The transceiver circuit, interface, interface circuit, or transceiver for implementing the receiving and transmitting functions may be separate or integrated. The transceiver circuit, interface, interface circuit, or transceiver may be used for reading and writing code / data, or the transceiver circuit, interface, interface circuit, or transceiver may be used for transmitting or delivering signals.

[0406] Optionally, the communication device 900 may include one or more memories 930, which may store instructions. The instructions may be executed on the processor 910, causing the communication device 900 to perform the method described in the above method embodiment. Optionally, the memory 930 may also store data. Optionally, the processor 910 may also store instructions and / or data. The processor 910 and memory 930 may be provided separately or integrated together.

[0407] It should be understood that, in one possible design, each step in the method embodiment provided in the present application can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0408] In one implementation, the communication device 900 may correspond to the terminal device in the above-mentioned method embodiment and may be used to execute the various steps and / or processes performed by the terminal device in the above-mentioned method embodiment. The processor 910 may be used to execute 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 the various steps and / or processes of the above-mentioned method embodiment corresponding to the terminal device.

[0409] In another implementation, the communication device 900 may correspond to the network device in the above-mentioned method embodiment, and may be used to execute the various steps and / or processes performed by the network device in the above-mentioned method embodiment. The processor 910 may be used to execute 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 the various steps and / or processes of the above-mentioned method embodiment corresponding to the network device.

[0410] It should be understood that the 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 processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0411] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and 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), synchronous link DRAM (SLDRAM), and direct RAM bus 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.

[0412] Based on the methods provided in the embodiments of the present application, the present application also provides a chip system, which includes a memory and one or more processors, configured to call and execute instructions stored in the memory from the memory, thereby executing the methods of the embodiments of the present application. The chip system can be composed of a chip or can include a chip and other discrete devices.

[0413] 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.

[0414] According to the method provided in the embodiment of the present application, the present application also provides a communication system, which includes the aforementioned access network device and terminal device.

[0415] According to the method provided in the embodiments of the present application, the present application also provides a computer program product, which includes: computer program code, when the computer program code runs on a computer, enables the computer to execute the various steps or processes executed by the access network device and terminal device in any of the aforementioned method embodiments.

[0416] According to the method provided in the embodiments of the present application, the present application also provides a computer-readable storage medium, which stores program code. When the program code runs on a computer, the computer executes the various steps or processes performed by the access network device and terminal device in any of the aforementioned method embodiments.

[0417] The computer-readable storage medium may be the aforementioned volatile memory or non-volatile memory, or may include both volatile memory and non-volatile memory.

[0418] In the embodiments of this application, each term and English abbreviation is provided for convenience of description and shall not constitute any limitation to this application. This application does not exclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

[0419] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented 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.

[0420] In the several embodiments provided in this 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 schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0421] It should be understood that in the various embodiments of the present application, the size of the serial number of each process 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 on the implementation process of the embodiments of the present application.

[0422] In short, the above description is only a preferred embodiment of the technical solution of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A communication method, characterized in that: Applied to a terminal device, the method includes: Receiving conditional handover 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 including a first event and / or a second event; the first event including an event related to an increase in an angle difference between a serving cell of the terminal device; the second event including an event related to a decrease in an angle difference between 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 between the neighboring cells of the terminal device; and / or, The exit condition of the second 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 decrease in the angle difference between the neighboring cells 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 increase in the 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 reduction of the angle difference between 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 of 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 cell of the terminal device includes: the difference between the angle difference of the neighboring cell 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 includes: Sending conditional handover 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, the CHO measurement event including a first event and / or a second event; the first event including an event related to an increase in an angle difference between a serving cell of the terminal device; and the second event including an event related to a decrease in an angle difference between 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 further 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 between the neighboring cells 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 between the neighboring cells of the terminal device; and / or, The exit condition of the second 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 decrease in the angle difference between the neighboring cells 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 increase in the 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 reduction of the angle difference between 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 of 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 cell of the terminal device includes: the difference between the angle difference of the neighboring cell 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 coupled to a memory, wherein the memory stores a program or instruction, and the processor executes the program or instruction so that the device is used to perform the method according to any one of claims 1 to 7, and / or the method according to any one of claims 8 to 14.

16. A communication system, characterized in that: The system includes terminal equipment and access network equipment, 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, causes 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 and / or the method according to any one of claims 8 to 14 are 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 and / or the method according to any one of claims 8 to 14 are implemented.

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