Method and apparatus for switching

Abstract

The present application provides a method and apparatus for handover. The method for handover includes: a terminal device sending path information for determining a first cell to a network device, and the terminal device receiving conditional handover (CHO) configuration information corresponding to the first cell sent by the network device and determining a target cell according to the CHO configuration information corresponding to the first cell. The technical solution provided by the present application can enable the terminal device to improve the success rate of handover when performing cell handover.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly, to a method and apparatus for handover. Background Art

[0002] In the traditional handover mechanism, the mobility management of connected terminal devices is controlled by network devices. Specifically, the traditional handover process includes the network device sending a handover message to the terminal device, and the handover message instructs the terminal device to hand over from the source cell to the target cell. Specifically, the handover message may include the identification information of the target cell (such as the physical cell identification) and the resource information required to hand over to the target cell (such as random access resource information, etc.). After receiving the handover message, the terminal device accesses the target cell according to the handover message. Therefore, the successful sending of the handover message is a necessary condition for ensuring successful handover under the traditional handover mechanism. However, in the LTE system or NR system, the rapid attenuation of the channel quality, or the rapid movement of the UE and the occlusion of objects, or the long duration of measurement and handover preparation will all cause the handover message to be sent fails, resulting in handover failure and reducing the handover success rate. In order to improve the handover reliability, a conditional handover (CHO) mechanism is proposed. However, the current protocol does not stipulate how to use the CHO mechanism in the drone scenario. Summary of the Invention

[0003] This application provides a method and apparatus for handover, aiming to improve the handover success rate.

[0004] In a first aspect, a method for handover is provided. The method for handover may be executed by a terminal device, or may be executed by a chip or circuit disposed in the terminal device. This application does not make any limitations in this regard. For the sake of description, it may be described by taking the execution by the terminal device as an example.

[0005] The method for handover includes:

[0006] The terminal device sends the path information of the terminal device to the network device, and the path information is used to determine a first cell; the terminal device receives the conditional handover (CHO) configuration information corresponding to the first cell from the network device; the terminal device determines a target cell according to the CHO configuration information corresponding to the first cell.

[0007] According to the method for handover provided by an embodiment of the present application, the terminal device sends path information for determining a first cell to the network device and receives the CHO configuration information corresponding to the first cell from the network device. The target cell is determined based on the CHO configuration information corresponding to the first cell. Since the first cell is determined in combination with the above path information, that is, the network device can provide a more suitable candidate cell for the terminal device, thereby improving the success rate of handover.

[0008] In combination with the first aspect, in some implementation manners of the first aspect, the CHO configuration information corresponding to the first cell is highly relevant; the method further includes: the terminal device determines the CHO configuration information corresponding to the first cell based on the height at which the terminal device is located.

[0009] The above-mentioned CHO configuration information corresponding to the first cell may be related to height. For different heights, there are different CHO configuration information corresponding to the first cell. The network device can provide the CHO configuration information corresponding to the first cell at a height granularity. Thus, the network device can flexibly and reasonably provide the CHO configuration information corresponding to the first cell and improve handover reliability.

[0010] In combination with the first aspect, in some implementation manners of the first aspect, the CHO configuration information corresponding to the first cell includes at least one of the CHO execution condition and the following information: the cell radio network temporary identity C-RNTI assigned by the first cell to the terminal device, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, or the frequency information of the first cell.

[0011] The above-mentioned CHO configuration information corresponding to the first cell may include the CHO execution condition corresponding to the first cell and the information required for the terminal device to handover to the first cell, providing feasibility for the terminal device to implement handover.

[0012] In combination with the first aspect, in some implementation manners of the first aspect, if the first cell includes one or more second cells that meet the corresponding CHO execution condition, the terminal device determining the target cell according to the CHO configuration information corresponding to the first cell includes: the terminal device determines the target cell from the one or more second cells.

[0013] In the case where the first cell includes at least one second cell that meets the CHO execution condition, the terminal device may select a target cell from the at least one second cell as the cell to be handed over to.

[0014] In combination with the first aspect, in some implementations of the first aspect, the terminal device determines the target cell from the multiple second cells as follows: The terminal device determines the target cell from the multiple second cells based on the trend of change in the distance of the terminal device relative to the source cell.

[0015] As a possible implementation, when there is at least one second cell in the first cell that meets the CHO execution condition, the terminal device can select a target cell from the at least one second cell as the cell to be switched to based on the trend of change in the distance between itself and the source cell.

[0016] In combination with the first aspect, in some implementations of the first aspect, the terminal device determines the target cell from the multiple second cells based on the trend of change in the distance of the terminal device relative to the source cell as follows: When the distance of the terminal device relative to the source cell becomes larger, the terminal device selects the cell that is the farthest from the source cell from the multiple second cells as the target cell; or, when the distance of the terminal device relative to the source cell becomes smaller, the terminal device selects the cell that is the closest to the source cell from the multiple second cells as the target cell.

[0017] When the terminal device is far from the source cell, the terminal device can select the cell that is the farthest from the source cell as the target cell; when the terminal device is close to the source cell, the terminal device can select the cell that is the closest to the source cell as the target cell.

[0018] In combination with the first aspect, in some implementations of the first aspect, the CHO configuration information corresponding to the first cell further includes distance information, and the distance information is used to indicate the distance between the first cell and the source cell.

[0019] To enable the terminal device to know the distance between the first cell and the source cell, the above-mentioned CHO configuration information corresponding to the first cell may carry distance information indicating the distance between the first cell and the source cell.

[0020] In combination with the first aspect, in some implementations of the first aspect, the terminal device determines the target cell from multiple second cells that meet the CHO execution condition as follows: The terminal device determines the target cell from the multiple second cells based on the trend of change in the signal quality of the multiple second cells, where the trend of change in the signal quality of the second cell includes the trend of change in the signal quality of the second cell within the TTT corresponding to the second cell.

[0021] As a possible implementation, when there is at least one second cell in the first cell that meets the CHO execution condition, the terminal device can select a target cell from the at least one second cell as the cell to be switched to based on the trend of change in the signal quality of the second cell.

[0022] In combination with the first aspect, in some implementations of the first aspect, the target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend.

[0023] The terminal device can select a cell with an upward signal quality change trend as the target cell to ensure that a cell with better signal quality is selected for handover.

[0024] In combination with the first aspect, in some implementations of the first aspect, the CHO configuration information corresponding to the first cell further includes a threshold value, and the target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend and the change rate of the signal quality is greater than or equal to the threshold value.

[0025] In order to enable the terminal device to select a cell with better signal quality as the target cell, the above-mentioned CHO configuration information corresponding to the first cell sent by the network device may carry a threshold value. In this way, when determining the target cell, the terminal device can select a cell whose signal quality change trend shows an upward trend and the change rate of the signal quality is greater than or equal to the threshold value as the target cell.

[0026] In a second aspect, a handover method is provided. The handover method can be executed by a network device, or can also be executed by a chip or circuit disposed in the network device. This application does not make a limitation in this regard. For the sake of convenience of description, it can be described by taking the execution by the network device as an example.

[0027] The handover method includes:

[0028] The network device receives the path information of the terminal device from the terminal device, and the path information is used to determine a first cell; the network device sends the conditional handover (CHO) configuration information corresponding to the first cell to the terminal device.

[0029] According to the handover method provided by the embodiments of the present application, by the terminal device sending the path information for determining the first cell to the network device and receiving the CHO configuration information corresponding to the first cell from the network device, and determining the target cell based on the CHO configuration information corresponding to the first cell. Since the first cell is determined in combination with the above-mentioned path information, that is, the network device can provide a more suitable candidate cell for the terminal device, thereby improving the success rate of handover.

[0030] In combination with the second aspect, in some implementations of the second aspect, the CHO configuration information corresponding to the first cell is related to height.

[0031] The CHO configuration information corresponding to the above-mentioned first cell may be related to height, and different heights correspond to different CHO configuration information corresponding to the first cell. The network device may provide the CHO configuration information corresponding to the first cell at the height granularity, so that the network device can flexibly and reasonably provide the CHO configuration information corresponding to the first cell and improve the handover reliability.

[0032] In combination with the second aspect, in some implementation manners of the second aspect, the CHO configuration information corresponding to the first cell includes at least one of the CHO execution condition and the following information: the cell radio network temporary identity C-RNTI allocated by the first cell to the terminal device, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, or the frequency information of the first cell.

[0033] The CHO configuration information corresponding to the above-mentioned first cell may include the CHO execution condition corresponding to the first cell and the information required for the terminal device to hand over to the first cell, providing feasibility for the terminal device to implement the handover.

[0034] In combination with the second aspect, in some implementation manners of the second aspect, the CHO configuration information corresponding to the first cell further includes distance information, and the distance information is used to indicate the distance between the first cell and the source cell.

[0035] In order to enable the terminal device to know the distance between the first cell and the source cell, the distance information indicating the distance between the first cell and the source cell may be carried in the CHO configuration information corresponding to the first cell.

[0036] In a third aspect, a handover method is provided. The handover method may be executed by a terminal device, or may be executed by a chip or a circuit disposed in the terminal device. This application does not make any limitation in this regard. For the sake of description, it may be described by taking the execution by the terminal device as an example.

[0037] The handover method includes:

[0038] The terminal device receives the conditional handover CHO configuration information corresponding to the first cell from the network device. The terminal device determines that there is one or more second cells in the first cell that meet the corresponding CHO execution conditions according to the conditional handover CHO configuration information corresponding to the first cell, and determines a target cell from the one or more second cells based on the distance change trend of the terminal device relative to the source cell.

[0039] According to the method for handover provided by the embodiments of the present application, when there is at least one second cell in the first cell that meets the CHO execution condition, the terminal device may select a target cell from the at least one second cell as the cell to be handed over to based on the changing trend of the distance between itself and the source cell.

[0040] In combination with the third aspect, in some implementation manners of the third aspect, the terminal device determines the target cell from the multiple second cells based on the changing trend of the distance of the terminal device relative to the source cell, including: when the distance of the terminal device relative to the source cell becomes larger, the terminal device selects the cell that is the farthest from the source cell from the multiple second cells as the target cell; or, when the distance of the terminal device relative to the source cell becomes smaller, the terminal device selects the cell that is the closest to the source cell from the multiple second cells as the target cell.

[0041] When the terminal device is far from the source cell, the terminal device may select the cell that is the farthest from the source cell from the candidate cells that meet the CHO execution condition as the target cell; when the terminal device is close to the source cell, the terminal device may select the cell that is the closest to the source cell from the candidate cells that meet the CHO execution condition as the target cell.

[0042] In combination with the third aspect, in some implementation manners of the third aspect, the CHO configuration information corresponding to the first cell further includes distance information, and the distance information is used to indicate the distance between the first cell and the source cell.

[0043] In order to enable the terminal device to know the distance between the first cell and the source cell, the CHO configuration information corresponding to the first cell described above may carry distance information indicating the distance between the first cell and the source cell.

[0044] In a fourth aspect, a method for handover is provided. The method for handover may be executed by a terminal device, or may be executed by a chip or circuit disposed in the terminal device. The present application does not make any limitation in this regard. For the sake of description, it may be described by taking the execution by the terminal device as an example.

[0045] The method for handover includes:

[0046] The terminal device receives the conditional handover (CHO) configuration information corresponding to the first cell from the network device; the terminal device determines that there is one or more second cells in the first cell that meet the corresponding CHO execution condition according to the CHO configuration information corresponding to the first cell, and the terminal device determines the target cell from the one or more second cells based on the changing trend of the signal quality of the one or more second cells, where the changing trend of the signal quality of the second cell includes the changing trend of the signal quality of the second cell within the TTT corresponding to the second cell.

[0047] According to the method for handover provided by the embodiments of the present application, when there is at least one second cell in the first cell that meets the CHO execution condition, the terminal device may select a target cell from the at least one second cell based on the signal quality change trend of the second cell as the cell to be handed over to.

[0048] In combination with the fourth aspect, in some implementation manners of the fourth aspect, when there is at least one second cell in the first cell that meets the CHO execution condition, the target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend.

[0049] The terminal device may select a cell with an upward signal quality change trend as the target cell to ensure that a cell with better signal quality is selected for handover.

[0050] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the CHO configuration information corresponding to the first cell further includes a threshold value, and the target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend and the change rate of the signal quality is greater than or equal to the threshold value.

[0051] To select a second cell with better signal quality, a threshold value may be carried in the CHO configuration information corresponding to the first cell above, and a cell whose signal quality change trend shows an upward trend and the change rate of the signal quality is greater than or equal to the threshold value is selected as the target cell.

[0052] In a fifth aspect, a handover device is provided. The handover device includes a processor for implementing the functions of the terminal device in the methods described in the first aspect, the third aspect, and the fourth aspect above.

[0053] Optionally, the handover device may further include a memory coupled to the processor, and the processor is used to implement the functions of the terminal device in the methods described in the first aspect, the third aspect, and the fourth aspect above.

[0054] In a possible implementation, the memory is used to store program instructions and data. The memory is coupled to the processor, and the processor may call and execute the program instructions stored in the memory to implement the functions of the terminal device in the methods described in the first aspect, the third aspect, and the fourth aspect above.

[0055] Optionally, the handover device may further include a communication interface for the handover device to communicate with other devices. When the handover device is a terminal device, the transceiver may be a communication interface or an input / output interface.

[0056] In a possible design, the device for switching includes: a processor and a communication interface, configured to implement the functions of the terminal device in the methods described in the first, third, and fourth aspects above. Specifically, it includes:

[0057] The processor communicates with the outside through the communication interface;

[0058] The processor is configured to run a computer program, so that the device implements any of the methods described in the first, third, and fourth aspects above.

[0059] It can be understood that the outside can be an object other than the processor, or an object outside the device.

[0060] In another implementation, when the device for switching is a chip or a chip system, the communication interface can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or a related circuit, etc. on the chip or the chip system. The processor can also be embodied as a processing circuit or a logic circuit.

[0061] In a sixth aspect, a device for switching is provided. The device for switching includes a processor, configured to implement the functions of the network device in the method described in the second aspect above.

[0062] Optionally, the device for switching may further include a memory, which is coupled to the processor, and the processor is configured to implement the functions of the network device in the method described in the second aspect above.

[0063] In a possible implementation, the memory is used to store program instructions and data. The memory is coupled to the processor, and the processor can call and execute the program instructions stored in the memory, for implementing the functions of the network device in the method described in the second aspect above.

[0064] Optionally, the device for switching may further include a communication interface, which is used for the device for switching to communicate with other devices. When the device for switching is a network device, the communication interface is a transceiver, an input / output interface, or a circuit, etc.

[0065] In a possible design, the device for switching includes: a processor and a communication interface, configured to implement the functions of the network device in the method described in the second aspect above. Specifically, it includes:

[0066] The processor communicates with the outside through the communication interface;

[0067] The processor is configured to run a computer program, so that the device implements any of the methods described in the second aspect above.

[0068] It can be understood that the external entity can be an object other than the processor, or an object outside the device.

[0069] In another possible design, the device for switching is a chip or a chip system. The communication interface can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or a related circuit, etc. on the chip or the chip system. The processor can also be embodied as a processing circuit or a logic circuit.

[0070] In a seventh aspect, there is provided a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a communication device, the communication device implements the methods in the first aspect, the third aspect, and the fourth aspect, and any possible implementation manners of the first aspect, the third aspect, and the fourth aspect.

[0071] In an eighth aspect, there is provided a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a communication device, the communication device implements the method in the second aspect and any possible implementation manners of the second aspect.

[0072] In a ninth aspect, there is provided a computer program product containing instructions. When the instructions are executed by a computer, the communication device implements the methods in the first aspect, the third aspect, and the fourth aspect, and any possible implementation manners of the first aspect, the third aspect, and the fourth aspect.

[0073] In a tenth aspect, there is provided a computer program product containing instructions. When the instructions are executed by a computer, the communication device implements the method in the second aspect and any possible implementation manners of the second aspect.

[0074] In an eleventh aspect, there is provided a communication system including the device for switching shown in the fifth aspect and the device for switching shown in the sixth aspect. Description of the Drawings

[0075] Figure 1 is a schematic diagram of a system 100 that can apply the method for switching in the embodiments of the present application.

[0076] Figure 2 is a schematic diagram of a CHO mechanism provided by the embodiments of the present application.

[0077] Figure 3 is a schematic diagram of a cell detected by a drone provided by the embodiments of the present application.

[0078] Figure 4 is a schematic flowchart of a method for switching provided by the embodiments of the present application.

[0079] Figure 5 is a schematic diagram of a device 500 for switching provided by the present application.

[0080] Figure 6 It is a schematic structural diagram of a terminal device 600 applicable to the embodiments of the present application.

[0081] Figure 7 It is a schematic diagram of a device 700 for handover provided by the present application.

[0082] Figure 8 It is a schematic structural diagram of a network device 800 applicable to the embodiments of the present application. Detailed implementation manners

[0083] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0084] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, 5th generation (5G) systems, New Radio (NR) or future networks, etc. The 5G mobile communication systems described in the present application include non-standalone (NSA) 5G mobile communication systems or standalone (SA) 5G mobile communication systems. The technical solutions provided by the present application can also be applied to future communication systems, such as 6th generation mobile communication systems. The communication system can also be a Public Land Mobile Network (PLMN) network, a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an Internet of Things (IoT) communication system or other communication systems.

[0085] The terminal equipment in the embodiments of this application may refer to an access terminal, user unit, user station, mobile station, mobile unit, relay station, remote station, remote terminal, mobile device, user terminal, user equipment (UE), terminal, wireless communication device, user agent or user device. The terminal equipment may also be a cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing devices connected to a wireless modem, in-vehicle device, wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), or a terminal device in a future vehicle-to-everything network, etc. The embodiments of this application are not limited thereto.

[0086] By way of example and not limitation, in the embodiments of this application, a wearable device may also be referred to as a wearable intelligent device, which is a general term for devices developed by applying wearable technologies to the intelligent design of daily wear, such as glasses, gloves, watches, clothing, shoes, etc. A wearable device is a portable device that is either directly worn on the body or integrated into the user's clothes or accessories. A wearable device is not just a hardware device, but more importantly, it realizes powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable intelligent devices include those with complete functions and large sizes that can achieve complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, etc., and those that only focus on a certain type of application function and need to cooperate with other devices such as smart phones, such as various smart bracelets and smart jewelry for physical sign monitoring.

[0087] In addition, in the embodiments of this application, the terminal equipment may also be a terminal device in an IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect items to a network through communication technologies, thereby realizing an intelligent network of human-machine interconnection and thing-thing interconnection. In the embodiments of this application, IoT technology can achieve massive connection, deep coverage, and power saving of the terminal through, for example, narrow band (NB) technology.

[0088] In addition, in the embodiments of the present application, the terminal device may further include sensors such as intelligent printers, train detectors, and gas stations. The main functions include collecting data (for some terminal devices), receiving control information and downlink data from the network device, and transmitting electromagnetic waves to transmit uplink data to the network device.

[0089] The network device in the embodiments of the present application may be any communication device with wireless transceiver functions for communicating with the terminal device. The device includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home evolved Node B (HeNB, or home Node B, HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (WIFI) system, wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP), etc. It may also be a 5G system, such as gNB in an NR system, or a transmission point (TRP or TP), one or a group of antenna panels of a base station in a 5G system (including multiple antenna panels), or it may also be a network node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU), etc.

[0090] In some deployments, the network device in the embodiments of the present application may refer to a central unit (CU) or a distributed unit (DU), or the network device includes a CU and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC), media access control (MAC), and physical (PHY) layers. The AAU implements some physical layer processing functions, radio frequency processing, and related functions of the active antenna. Since the information in the RRC layer will ultimately become the information in the PHY layer, or is transformed from the information in the PHY layer, thus, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or sent by the DU + AAU. It can be understood that the network device may be a device including one or more of the CU node, DU node, and AAU node. In addition, the CU may be classified as a network device in the radio access network (RAN), or the CU may be classified as a network device in the core network (CN), and the present application does not make any limitations in this regard.

[0091] Furthermore, the CU can also be divided into a Central Unit for the control plane (CU-CP) and a Central Unit for the user plane (CU-UP). Among them, the CU-CP and CU-UP can also be deployed on different physical devices. The CU-CP is responsible for the control plane functions, mainly including the RRC layer and the PDCP-C layer. The PDCP-C layer is mainly responsible for functions such as encryption, decryption, integrity protection, and data transmission of control plane data. The CU-UP is responsible for the user plane functions, mainly including the SDAP layer and the PDCP-U layer. Among them, the SDAP layer is mainly responsible for processing the data from the core network and mapping the flow to the bearer. The PDCP-U layer is mainly responsible for at least one function such as encryption, decryption, integrity protection, header compression, sequence number maintenance, and data transmission of the data plane. Specifically, the CU-CP and CU-UP are connected through a communication interface (for example, the E1 interface). The CU-CP represents the network device and is connected to the core network device through a communication interface (for example, the Ng interface), and is connected to the DU through a communication interface (for example, the F1-C (control plane) interface). The CU-UP is connected to the DU through a communication interface (for example, the F1-U (user plane) interface).

[0092] There is also a possible implementation where the PDCP-C layer is also included in the CU-UP.

[0093] It can be understood that the above protocol layer division of the CU and DU, as well as the CU-CP and CU-UP, is only an example, and there may be other division methods. The embodiments of this application do not limit this.

[0094] The network device mentioned in the embodiments of this application can be a device including a CU, or a DU, or a device including a CU and a DU, or a device including a control plane CU node (CU-CP node), a user plane CU node (CU-UP node), and a DU node.

[0095] The network device and the terminal device 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 satellites in the air. The embodiments of this application do not limit the scenarios where the network device and the terminal device are located.

[0096] In an embodiment of the present application, a terminal device or a network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also referred to as main memory). The operating system can be any one or more computer operating systems that implement service processing through processes. For example, the Linux operating system, the Unix operating system, the Android operating system, the iOS operating system, or the Windows operating system, etc. The application layer includes applications such as a browser, an address book, a word processing software, and an instant messaging software.

[0097] In addition, various aspects or features of the present application can be implemented as a method, an apparatus, or an article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used in the present application covers a computer program accessible from any computer-readable device, carrier, or medium. For example, the computer-readable medium can include, but is not limited to: magnetic storage devices (such as hard disks, floppy disks, or magnetic tapes, etc.), optical discs (such as compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (such as erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). In addition, the various storage media described herein can represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable storage medium" can include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0098] To facilitate the understanding of the embodiments of the present application, first, a communication system shown in Figure 1 will be used as an example to describe in detail the communication system applicable to the embodiments of the present application. Figure 1 is a schematic diagram of a communication system 100 for a handover method applicable to the embodiments of the present application. As shown in Figure 1 The communication system 100 may include at least one network device, such as the network device 110 shown in Figure 1 The communication system 100 may further include at least one terminal device, such as the one shown in Figure 1The terminal device 120 shown. The network device 110 and the terminal device 120 can communicate via a wireless link. Each communication device, such as the network device 110 or the terminal device 120, can be configured with multiple antennas. For each communication device in the communication system 100, the multiple configured antennas can include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Therefore, between each communication device in the communication system 100, such as between the network device 110 and the terminal device 120, communication can be carried out through multi-antenna technology.

[0099] It should be understood that Figure 1 For the sake of easy understanding, it is a simplified schematic diagram given as an example. The communication system 100 may further include other network devices or may further include other terminal devices, Figure 1 which are not drawn in the figure.

[0100] For the sake of easy understanding of the embodiments of the present application, several basic concepts involved in the embodiments of the present application are briefly described. It should be understood that the basic concepts introduced below are briefly described by taking the basic concepts defined in the NR protocol as an example, but it is not limited that the embodiments of the present application can only be applied to the NR system. Therefore, the standard names that appear when describing by taking the NR system as an example are all functional descriptions, and the specific names are not limited, only indicating the functions of the devices, and can be correspondingly extended to other systems, such as 2G, 3G, 4G or future communication systems.

[0101] 1. CHO mechanism.

[0102] In the traditional handover process, the mobility management of the connected-state terminal device is controlled by the network device, that is, the network device instructs the terminal device to perform a handover by sending a handover message. Specifically, the source network device sends a handover message to the terminal device to control the terminal device to hand over from the source cell to the target cell.

[0103] The above handover message can be a radio resource control (RRC) message. Specifically, in the NR system, this RRC message can be an RRC reconfiguration message carrying a reconfiguration with sync cell; in the LTE system, this RRC message can be an RRC connection reconfiguration message carrying a mobility controlinfo cell.

[0104] Taking the NR system as an example, further, the above handover message includes relevant information of the target cell and relevant configuration parameters required for the terminal device to access the target cell. Among them, the information of the target cell may be the physical cell identifier (PCI) of the target cell, the cell global identifier (CGI) of the target cell, the frequency information corresponding to the target cell, or the cell radio network temporary identifier (C-RNTI) assigned by the target cell to the terminal device. The frequency information corresponding to the target cell may include one or more of the following: the absolute frequency of the synchronization signal block (SSB) (for example, absoluteFrequencySS), the absolute frequency position of the reference resource module (common RB0) (for example, absoluteFrequencyPointA), the frequency bandwidth list (for example, frequencyBandList), the carrier list specific to the subcarrier spacing (SCS) (for example, scs-SpecificCarrierList), etc.;

[0105] The relevant configuration parameters required for the terminal device to access the target cell may include random access channel (RACH) resource information required for accessing the target cell (for example, dedicated RACH resources and / or common RACH resources, etc.).

[0106] Specifically, after receiving the handover message, the terminal device can access the target cell according to the information contained in the handover message. It can be seen that the successful sending of the handover message is a necessary condition for the terminal device to successfully perform handover under the traditional handover mechanism. However, in the LTE system or NR system, the rapid attenuation of the channel quality, the rapid movement of the terminal device, and the occlusion of objects, or the long duration of measurement and handover preparation will all cause the handover message to be sent failed, resulting in handover failure and reducing the handover success rate.

[0107] In view of the above problems, the handover method adopting the conditional handover mechanism can improve the handover success rate, as Figure 2 shown, Figure 2 is a schematic diagram of a CHO method provided by an embodiment of the present application. The execution subjects mainly include a terminal device and a network device.

[0108] This CHO method at least includes the following partial steps.

[0109] S210, the source network device sends CHO configuration information to the terminal device.

[0110] Specifically, when the quality of the radio link between the source network device and the terminal device in the source cell (which can be referred to as the source link, for example) is good, the source network device sends an RRC message (such as an RRC reconfiguration message) to the terminal device. The RRC message may include CHO configuration information corresponding to at least one candidate cell. The CHO configuration information may include CHO trigger conditions (which can also be referred to as execution conditions) information and candidate cell information. The candidate cell information may include at least one of the following: the C-RNTI allocated by the candidate cell to the terminal device, the RACH resource information required to access the candidate cell, the CGI of the candidate cell, the PCI of the candidate cell, the frequency information corresponding to the candidate cell; the CHO execution condition information may include the CHO execution event type and corresponding parameters (such as the threshold value, trigger time, hysteresis value, etc. for CHO execution). The CHO execution event type may include event B1, event B2, event A3, event A4, event A5, or other event types, etc. The CHO execution conditions corresponding to different candidate cells may be the same or different, and the present application does not limit this.

[0111] After the terminal device receives the RRC message containing the CHO configuration information, it determines whether at least one candidate cell meets the CHO execution conditions according to the CHO configuration information, and uses a certain candidate cell that meets the CHO execution conditions as the target cell, that is Figure 2 The method flow shown also includes S220, where the terminal device determines the target cell.

[0112] After the terminal device determines the target cell, the terminal device can perform a random access procedure with the determined target cell, that is Figure 2 The method flow shown also includes S230, where the terminal device initiates random access.

[0113] When the random access is successfully completed, the terminal device sends an RRC message (such as an RRC reconfiguration complete message) to the network device to which the target cell belongs (that is, the target network device, such as Figure 2 the candidate network device #1 in) to notify the target network device that the conditional handover is completed, that is Figure 2 The method flow shown also includes S240, where the terminal device sends an RRC message to candidate network device #1 (that is, the target network device). Optionally, the above random access procedure S230 can be skipped. For example, when the RRC message containing the CHO configuration information includes RACH-less information (such as TA information, UL grant information, etc.) corresponding to at least one candidate cell, the RACH process can be skipped. That is, after the terminal device determines the target cell, it can directly send an RRC reconfiguration complete message to the target network device.

[0114] It should be understood that before the source network device executes S210 described above, the source network device will send an RRC reconfiguration message to the terminal device. The RRC reconfiguration message includes measurement configuration information, instructing the terminal device to measure the quality of neighboring cells. After the terminal device performs the measurement, it reports the measurement result to the source network device. The source network device sends a request message (such as the request message can be a handover request message) to at least one candidate network device (i.e., the network device to which the candidate cell belongs). The request message is used to request the candidate network device to prepare for the CHO process (such as preparing / configuring the above-mentioned "information of the candidate cell"), and can receive a response message from the candidate network device (such as the response message can be a handover request response message), that is Figure 2 The method flow shown also includes Figure 2 six steps of S211 to S216 as shown in. It can be understood that the source network device and the candidate network device can be the same network device or different network devices. If the source network device and the candidate network device are the same network device, there may be no signaling interaction between the source network device and the candidate network device. For example, if the source network device and candidate network device #1 are the same network device, S213 and S214 can be omitted. This is only an example here and is not limited to this.

[0115] As described above, in the CHO mechanism, since the source network device sends the CHO configuration information to the terminal device when the communication quality of the source link is good, the transmission success rate of the CHO configuration information is guaranteed, thereby improving the handover success rate.

[0116] 2. Determination of the target cell.

[0117] Figure 2 In the CHO mechanism shown, after the terminal device receives the CHO configuration information, it needs to determine the target cell. Specifically, the source network device in the CHO mechanism can configure one or more candidate cells. After the terminal device receives the CHO configuration information, it judges whether the CHO execution condition is satisfied.

[0118] As a possible implementation manner, assume that for candidate cell A, the configured CHO execution event type is an A3 event, and the configured corresponding threshold is the first threshold (for example, it is the compensation (offset) dB). Then when the cell signal quality of candidate cell A is greater than or equal to the cell signal quality of the serving cell by the first threshold, it can be considered that candidate cell A satisfies the CHO execution condition, and this candidate cell A can be determined as the target cell;

[0119] As another possible implementation, assume that for candidate cell B, if the configured CHO execution event type is A5 event, and the corresponding configured threshold values are the second threshold and the third threshold, then when the cell signal quality of candidate cell B is higher than the second threshold and the cell signal quality of the serving cell is lower than the third threshold, it can be considered that candidate cell B meets the CHO execution condition, and this candidate cell B can be determined as the target cell.

[0120] Furthermore, if the CHO configuration information includes a time to trigger (TTT), the TTT can be at the cell granularity, that is, the TTTs corresponding to different candidate cells can be the same or different. For example, the CHO configuration information can include one or more TTTs, and the correspondence between the candidate cell and the TTT can be one-to-one, or many-to-one, or one-to-many. The TTTs corresponding to each candidate cell can be the same or different, and the present application does not make any limitations in this regard. Then, if and only if within the TTT corresponding to a certain candidate cell, this candidate cell always meets the CHO execution condition (for example, within the TTT, the signal quality of this candidate cell always meets the A3 event triggering condition), the terminal device can determine that this candidate cell meets the CHO execution condition.

[0121] Optionally, if there are multiple candidate cells that each meet their respective CHO execution conditions, the terminal device can select one cell from these multiple candidate cells that meet the CHO execution conditions according to a certain rule. For example, determine the cell with the highest cell signal quality among the multiple candidate cells that meet the CHO execution conditions as the target cell, or determine the cell with the highest priority (such as the highest frequency priority) among the multiple candidate cells that meet the CHO execution conditions as the target cell, or determine the cell with the most excellent beams (excellent beams refer to beams whose signal quality is higher than a certain predetermined threshold value, and this predetermined threshold value can be carried in the RRC message containing the CHO configuration information or is agreed upon by the protocol, and the present application does not make any limitations in this regard) among the multiple candidate cells that meet the CHO execution conditions as the target cell, or determine any one of the multiple candidate cells that meet the CHO execution conditions as the target cell, or determine the target cell by other means.

[0122] It should be understood that in the initial design of the mobile communication system, it was mainly targeted at ground terminal devices. When the height of the terminal device is higher than that of the base station, problems such as increased interference and frequent handovers will occur. Taking the terminal device as an aerial UE as an example, when the flight height of the drone is higher than that of the base station, the following problems will occur when the drone accesses the network for communication:

[0123] Problem 1: The radiation direction of the base station signal is mainly towards the ground. Although there will be reflections or scatterings of the ground signal that cause some signals to spread into the air, or there will also be some side lobes of the base station antenna that radiate into the air, generally speaking, the signal strength received by the drone will be relatively low.

[0124] Problem 2: When the drone is flying at a high altitude, since there are fewer obstacles, the drone may receive signals sent by many neighboring stations, resulting in serious downlink interference.

[0125] Therefore, for the mobile scenario of the drone, the above-mentioned CHO mechanism can improve the handover success rate and reliability of the drone. The application of the CHO mechanism in the mobile scenario of the drone can depend on the flight path of the drone. The following briefly introduces the reporting of the flight path of the drone involved in this application.

[0126] 3. Reporting of the flight path of the drone.

[0127] The network device can send a UE Information Request message to the drone, and this message is used to request the drone to report flight path information.

[0128] Optionally, the request message can include the maximum number of waypoints / coordinate points (such as N) that the drone can report, and whether it is necessary to report timestamp information. After receiving the request message, the drone replies to the network device with a UE Information Response message. This response message can include the location information of one or more waypoints / coordinate points (for example, the location information can include longitude information, latitude information, and altitude information), and the timestamp information corresponding to when the drone passes through each waypoint / coordinate point (for example, the timestamp information can include absolute time information or relative time information). Among them, the timestamp information can also be reported according to whether it is necessary to report timestamp information in the request message. If the request message does not require reporting timestamp information, it can also not be reported.

[0129] For the drone, when it is at different altitudes in the air, the cells that the drone can detect are different. As Figure 3 shown, Figure 3 is a schematic diagram of the cells detected by a drone provided by an embodiment of this application. From Figure 3As can be seen, when the altitude of the drone is H1, the detectable cells are (cell#1, cell#2, cell#3, cell#4, and cell#5); when the altitude of the drone is H2, the detectable cells are (cell#1, cell#3, cell#5). The handover method provided in this application can adopt the CHO mechanism in the drone scenario to improve the success rate of cell handover for the drone. However, it should be understood that the handover method provided in the embodiments of this application is not limited to the drone scenario.

[0130] In addition, to facilitate the understanding of the embodiments of this application, the following explanations are made.

[0131] First, in this application, "for indicating" may include for directly indicating and for indirectly indicating. When it is described that a certain indication information is used to indicate A, it may include that the indication information directly indicates A or indirectly indicates A, and it does not mean that the indication information must include A.

[0132] The information indicated by the indication information is called the to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information. For example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or the index of the to-be-indicated information, etc. It can also indirectly indicate the to-be-indicated information by indicating other information, where there is an association relationship between the other information and the to-be-indicated information. It can also only indicate a part of the to-be-indicated information, while the other parts of the to-be-indicated information are known or pre-agreed. For example, the indication of specific information can also be achieved by relying on the pre-agreed (such as protocol-defined) arrangement order of each information, so as to reduce the indication overhead to a certain extent. At the same time, the common parts of each information can be identified and indicated uniformly to reduce the indication overhead caused by separately indicating the same information.

[0133] Second, in this application, the first, the second, and various numerical numbers (such as "#1", "#2") are only for the convenience of description for distinction and are not used to limit the scope of the embodiments of this application. For example, to distinguish different information, etc.

[0134] Third, in this application, "preset" may include being indicated by network device signaling or being predefined. For example, protocol-defined. Among them, "predefined" can be implemented by pre-saving corresponding codes, tables, or other ways that can be used to indicate relevant information in the device (such as including terminal devices and network devices). This application does not limit its specific implementation method.

[0135] Fourth, the "saving" involved in the embodiments of the present application may refer to saving in one or more memories. The one or more memories may be separately provided, or may be integrated in an encoder, a decoder, a processor, or a communication device. The one or more memories may also have a part separately provided and a part integrated in a decoder, a processor, or a communication device. The type of the memory may be any form of storage medium, and the present application does not limit this.

[0136] Fifth, the "protocol" involved in the embodiments of the present application may refer to a standard protocol in the communication field. For example, it may include the LTE protocol, the NR protocol, and related protocols applied to future communication systems. The present application does not limit this.

[0137] As mentioned above in combination with Figure 1 briefly introduced the scenarios to which the method for handover provided by the embodiments of the present application can be applied, and introduced the basic concepts that may be involved in the embodiments of the present application. Next, the method for handover provided by the embodiments of the present application will be described in detail with reference to the drawings.

[0138] It should be understood that the method for handover provided by the embodiments of the present application can be applied to a system that communicates through multi-antenna technology. For example, Figure 1 the communication system 100 shown in. This communication system may include at least one network device and at least one terminal device. Communication can be carried out between the network device and the terminal device through multi-antenna technology.

[0139] It should also be understood that the specific structure of the execution subject of the method provided by the embodiments of the present application is not particularly limited in the embodiments shown below. As long as it can communicate according to the method provided by the embodiments of the present application by running a program recorded with the code of the method provided by the embodiments of the present application. For example, the execution subject of the method provided by the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0140] Hereinafter, without loss of generality, the interaction between the network device and the terminal device will be taken as an example to detail the method for handover provided by the embodiments of the present application.

[0141] Figure 4 is a schematic flowchart of a method for handover provided by the embodiments of the present application. The execution subjects in this flowchart include a terminal device and a network device.

[0142] This method for handover at least includes the following partial steps.

[0143] S410, the terminal device sends path information to the network device. Among them, the network device may be a source network device.

[0144] As a possible implementation, the terminal device sending path information to the network device may be as follows: The terminal device receives a UEInformationRequest message sent by the network device, where the UEInformationRequest is used to request the terminal device to report path information; the terminal device replies to the network device with a UEInformationResponse (UE Information Response) message, where the response message includes the path information of the terminal device.

[0145] As another possible implementation, the terminal device sending path information to the network device may be as follows: The terminal device periodically and actively reports path information to the network device.

[0146] As yet another possible implementation, the terminal device sending path information to the network device may be as follows: When the terminal device enters the connected state, it reports its own path information to the network device. For example, its own path information is included in the RRC establishment request message or the RRC establishment complete message.

[0147] As yet another possible implementation, the terminal device sending path information to the network device may be as follows: After the terminal device receives an RRC message containing measurement configuration information sent by the network device, it reports its own path information to the network device.

[0148] As yet another possible implementation, the terminal device sending path information to the network device may be as follows: The terminal device randomly reports its own path information to the network device. As a possible implementation, the terminal device may transmit path information between the terminal device and the network device through a UEInformationResponse message, or an RRC establishment complete message, or an RRC reconfiguration complete message, or an RRC re-establishment complete message, or an RRC resume complete message, or other signaling for sending path information.

[0149] In the embodiments of this application, there are no restrictions on how the terminal device reports path information to the network device and under what circumstances it will report path information to the network device. One can refer to the current protocol regulations or the future protocol regulations after the development of communication technologies.

[0150] In the scenario where the above terminal device is a drone, the path information of the terminal device in the embodiments of this application may also be referred to as the flight path information of the terminal device. In the embodiments of this application, there is no restriction on the specific name of the path information sent by the terminal device to the network device. It is only functionally defined that the path information of the terminal device can indicate the coordinates of the location where the terminal device is already located, will be located, or is currently located.

[0151] For example, taking a drone as an example to illustrate how a terminal device reports path information. The drone reporting path information can refer to the regulations in the current protocol. In one example, after the drone receives the UEInformationRequest message sent by the network device, it replies to the network device with a UEInformationResponse message. This response message can include the location information of multiple coordinate points, and / or the horizontal flight speed of the drone, and / or the vertical flight speed of the drone.

[0152] Optionally, the path information can include the location information of coordinate points, for example, longitude information, latitude information, altitude information, etc.; the path information can also include the timestamp information corresponding to when the terminal device is at this coordinate point. The timestamp information can include absolute time information and / or relative time, for example, Beijing time, coordinated universal time (UTC), or European time, or other time, which is not limited in this application.

[0153] S420. The network device sends the CHO configuration information corresponding to the first cell to the terminal device.

[0154] After the network device obtains the above path information, the network device can convert the path information into cell information based on the path information and the actual network deployment situation, and determine at least one third cell based on the cell information. Among them, the network device obtaining the above path information can be to read the path information from local storage (for example, after the network device obtains the path information in S410 above, it saves the information locally and can directly read it from local storage when the path information is needed), or it can also be to request the terminal device to report the path information when the path information is needed.

[0155] In a possible implementation manner, the network device can convert the three-dimensional position information corresponding to the coordinate points in the path information into cell-related information (such as, PCI, frequency point information, CGI or ECGI, etc.). Based on the converted cell-related information, the network device can determine at least one third cell. Among them, converting the three-dimensional position information corresponding to the coordinate points into cell-related information can be to determine the relevant information of the cells that may exist near the coordinate points according to the three-dimensional position information corresponding to the coordinate points.

[0156] Further, the source network device may use all or part of the at least one third cell as a fourth cell, and the fourth cell may include one or more cells. Further, after the handover preparation for the CHO process is performed, for example, after the source network device and the network devices to which the at least one fourth cell belongs respectively perform handover preparation, the first cell (or the CHO configuration information corresponding to the first cell) can be obtained from the fourth cell, where the first cell may include one or more cells, and the first cell may also be referred to as a candidate cell. Then, the source network device may send the CHO configuration information corresponding to the first cell to the terminal device.

[0157] It should be understood that there may be multiple first cells as described above, that is, there are multiple third cells that the source network device can determine based on the received path information and the actual network deployment situation, etc. The source network device uses part or all of the third cells as the fourth cell (such as the fourth cell may be multiple), and after performing handover preparation with the fourth cell, one or more first cells can be determined, and the CHO configuration information corresponding to the at least one first cell is sent to the terminal device.

[0158] For example, the source network device determines N third cells based on the path information reported by the terminal device and the actual network deployment situation, and uses P cells among the N third cells as the fourth cell. After the handover preparation process is completed, M cells among the P cells can be used as the first cell, where N, P, and M are positive integers, M is less than or equal to P, and P is less than or equal to N.

[0159] As a possible implementation manner, the CHO configuration information corresponding to the first cell (such as the above-mentioned M cells) can be sent to the terminal device included in an RRC message. Among them, the RRC message may be a newly defined RRC message or may reuse the RRC message specified in the current protocol. The embodiments of the present application do not make any limitations in this regard. For example, in the NR system, the RRC message may be an RRC reconfiguration message; in the LTE system, the RRC message may be an RRC connection reconfiguration message.

[0160] As another possible implementation manner, the CHO configuration information corresponding to the first cell can be sent to the terminal device included in other newly added or existing signaling.

[0161] The CHO configuration information corresponding to the first cell includes CHO execution condition information. The CHO execution condition information can also be referred to as CHO trigger condition information. The CHO execution condition information may include a CHO trigger event type and corresponding parameters (such as TTT, threshold value, hysteresis value, etc.). The CHO trigger event type may include event B1, event B2, event A3, event A4, event A5, or other trigger event types, etc. The CHO execution conditions corresponding to different first cells may be the same or different. Refer to the description of the CHO execution conditions in the current protocol, and this application does not make any limitations in this regard.

[0162] The CHO configuration information corresponding to the first cell may further include at least one of the following: the C-RNTI allocated by the first cell to the terminal device, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, the frequency information of the first cell, the physical layer configuration parameters corresponding to the first cell, the MAC layer configuration parameters, the RLC layer configuration parameters, the PDCP layer configuration parameters, the SDAP layer configuration parameters, or the RRC layer configuration parameters, etc. Among them, the index information corresponding to the first cell may be a measurement identifier and / or a conditional handover configuration identifier (CHO-ConfigId). The identification information of the first cell may be a physical cell identifier (PCI) or a cell global identifier (CGI) or an E-UTRAN cell global identifier (ECGI). The C-RNTI allocated by the first cell to the terminal device includes the C-RNTIs allocated by multiple first cells to the terminal device respectively. The identification allocated by the first cell to the terminal device includes the identifications allocated by multiple first cells to the terminal device respectively. The resource information required for the terminal device to access the first cell includes the resource information required for the terminal device to access multiple first cells respectively (or it can be understood as the resource information allocated by multiple first cells to the terminal device to access them respectively).

[0163] This application does not limit the specific information content included in the CHO configuration information corresponding to the first cell, and the current protocol regulations can be referred to. Specifically, when there are multiple first cells, the CHO configuration information corresponding to the first cells includes the CHO configuration information corresponding to each of the multiple first cells respectively. The CHO configuration information corresponding to each of the multiple first cells can be sent to the terminal device through one message or multiple messages.

[0164] Optionally, different heights or height ranges correspond to different first cells. Herein, the height may be the height of the terminal device relative to the ground, or the height may be the height of the terminal device relative to the sea level, or the height may be the height of the terminal device relative to a certain reference point. The present application does not limit this. Specifically, in addition to the three-dimensional information in the path information, the network device can also combine the path information to determine one or more first cells corresponding to different heights (or height ranges).

[0165] It should be understood that the first cell is a general term, and there may be multiple cells called first cells. Then, different heights or height ranges corresponding to different first cells can be understood as the cells corresponding to different heights or height ranges being completely different; or, it can also be understood that the cells corresponding to different heights or height ranges are not completely the same. For example, among the first cells corresponding to different heights or height ranges, some cells are the same and some cells are different. In this case, it is also said that the first cells corresponding to different heights or height ranges are different.

[0166] Furthermore, the CHO configuration information corresponding to the first cell is related to the height. For example, the CHO configuration information corresponding to the first cell is at the height granularity or height range granularity. That is, for different heights (or height ranges), the network can provide different CHO configuration information (for example, providing the CHO configuration information corresponding to the above-mentioned first cells corresponding to multiple heights respectively). At this time, for the one or more first cells respectively configured for different heights or height ranges, they may all be different, or some may be the same and some may be different. Moreover, for different heights or height ranges, even if some cells among the multiple first cells are the same, the CHO configuration information corresponding to these same cells may be the same or different. The present application does not limit this.

[0167] The CHO configuration information corresponding to the multiple different first cells may be included in the RRC message. The RRC message may further include height threshold values (such as H1, H2) or height range information (such as [H3, H4], [H5, H6]), and there is a corresponding relationship between the height threshold value (or height range) and the CHO configuration information corresponding to the multiple different first cells.

[0168] For example, the RRC message sent by the network device to the terminal device contains H1, H2, the CHO configuration information config#1 corresponding to the first cell (for example, config#1 contains config#1a corresponding to cell#2 and config#1b corresponding to cell#4), the CHO configuration information config#2 corresponding to the first cell (for example, config#2 contains config#2a corresponding to cell#1, config#2b corresponding to cell#2, config#2c corresponding to cell#3, config#2d corresponding to cell#4, and config#2e corresponding to cell#5), and the CHO configuration information config#3 corresponding to the first cell (for example, config#3 contains config#3a corresponding to cell#1, config#3b corresponding to cell#3, and config#3c corresponding to cell#5). Among them, the CHO configuration information config#1 corresponding to the first cell corresponds to a height lower than H1, the CHO configuration information config#2 corresponding to the first cell corresponds to a height higher than or equal to H1 and lower than or equal to H2, and the CHO configuration information config#3 corresponding to the first cell corresponds to a height higher than H2. After receiving the above RRC message sent by the network device, the terminal device can determine the CHO configuration information that can be used when judging whether the CHO execution condition is satisfied according to its own height. For example, when the flight height is lower than H1, the terminal device can use config#1; when the flight height is higher than or equal to H1 and lower than or equal to H2, the terminal device can use config#2; when the flight height is higher than H2, the terminal device can use config#3. Further, after the terminal device determines the CHO configuration information that can be used in the process of judging whether the CHO execution condition is satisfied, it proceeds with the subsequent processes (such as judging whether the CHO execution condition is satisfied, determining the target cell, and attempting to access the target cell). For example, if the height of the terminal device is lower than H1, the terminal device proceeds with the subsequent processes according to config#1; if the height of the terminal device is higher than or equal to H1 and lower than or equal to H2, the terminal device proceeds with the subsequent processes according to config#2; if the height of the terminal device is higher than H2, the terminal device proceeds with the subsequent processes according to config#3.

[0169] After the terminal device determines the CHO configuration information (or the candidate cells corresponding to the available CHO configuration information) that can be used in the process of judging whether the CHO execution condition is satisfied, it can determine the target cell based on the determined CHO configuration information. Among them, the determined CHO configuration information is included in the CHO configuration information corresponding to the first cell. That is Figure 4The method flow shown also includes: S430, the terminal device determines a target cell. The determined target cell belongs to the candidate cells, and the target cell meets the CHO execution condition. In the embodiments of the present application, the target cell refers to the cell that the terminal device attempts to handover to / attach to, and the source cell refers to the cell that provides services to the terminal device before the handover.

[0170] Optionally, the above first cell includes one or more second cells that meet the corresponding CHO execution conditions, or,

[0171] After receiving the RRC message including the CHO configuration information corresponding to the altitude range, the terminal device combines its own altitude to determine the available CHO configuration information (or, determines the fifth cell corresponding to the available CHO configuration information); then, according to the available CHO configuration information, determines the cell (such as the second cell) in the fifth cell that meets the CHO execution condition.

[0172] The terminal device determines the target cell including: the terminal device determines the target cell from the above one or more second cells that meet the corresponding CHO execution conditions.

[0173] As a possible implementation manner, the terminal device may randomly determine the target cell from one or more second cells.

[0174] As another possible implementation manner, the terminal device determines the target cell from multiple second cells based on the distance change trend of the terminal device relative to the source cell. That is, when multiple second cells all meet the CHO execution condition, the terminal device may determine the target cell from the above multiple second cells according to its own flight direction.

[0175] For example, when the distance between the terminal device and the source cell becomes larger, the terminal device selects the cell that is the farthest from the source cell as the target cell from multiple second cells; or,

[0176] When the distance between the terminal device and the source cell becomes smaller, the terminal device selects the cell that is the closest to the source cell as the target cell from multiple second cells.

[0177] Optionally, the CHO configuration information corresponding to the first cell further includes distance information, and the distance information indicates the distance between the first cell and the source cell.

[0178] There can be various forms of representation for the distance information indicating between the first cell (which may include one or more cells) and the source cell. For example, it can represent the distance length between the first cell and the source cell, or the level information indicating the distance proximity between the first cell and the source cell. The present application does not limit the specific manifestation form of the indication information, as long as the terminal device can determine the distance proximity between the first cell and the source cell based on this indication information.

[0179] Optionally, the above level information can be represented by binary values. For example, if 3 first cells are configured, the level information can be represented by a 2-bit binary value; if 5 first cells are configured, the level information can be represented by a 3-bit binary value. A specific representation method is that the first cell closest to the source cell can be represented as level 0, and so on, that is, the smaller the level number, the closer the distance to the source cell; or vice versa, the candidate cell farthest from the source cell can be represented as level 0, and so on, that is, the smaller the level number, the farther the distance to the source cell. Optionally, the mapping relationship between the level information and the distance proximity (for example, whether the smaller binary value (or level number) indicates a closer distance to the source cell or a farther distance to the source cell) can be agreed upon by the protocol or indicated by the network device, and the embodiments of the present application do not limit this. It should be understood that using binary values to represent the level information is only an example and does not limit the protection scope of the present application. The level information can also have other representation forms. For example, the above level information can be represented by octal, decimal, or hexadecimal values, and the embodiments of the present application do not limit this.

[0180] For example, a network device is configured with 3 first cells (such as cell#1, cell#2, and cell#3). Among the 3 first cells, cell#2 is the closest to the source cell, so the hierarchical information can be set to "00"; cell#1 is the second closest to the source cell, so the hierarchical information can be set to "01"; cell#3 is the farthest from the source cell, so the hierarchical information can be set to "10". In the RRC message containing the CHO configuration information sent by the network device to the terminal device, in addition to the CHO execution conditions corresponding to cell#1, cell#2, and cell#3 (the CHO execution conditions corresponding to these 3 cells can be the same or different), the PCI corresponding to cell#1, cell#2, and cell#3 respectively, the C-RNTI allocated to the terminal device for cell#1, cell#2, and cell#3 respectively, the RACH resource information required to access cell#1, the RACH resource information required to access cell#2, the RACH resource information required to access cell#3, the index information and frequency information of cell#1, the index information and frequency information of cell#2, and the index information and frequency information of cell#3. Optionally, the RRC message may further include the hierarchical information corresponding to cell#1, cell#2, and cell#3 respectively. For example, the hierarchical information of cell#1 is "01", the hierarchical information of cell#2 is "00", and the hierarchical information of cell#3 is "10". Or, optionally, the RRC message may further include the distance length values of cell#1, cell#2, and cell#3 from the source cell. If the terminal device determines that both cell#1 and cell#3 meet the CHO execution conditions based on the above RRC message, the terminal device can further determine the target cell in combination with its own flight trend. For example, if the flight route of the terminal device is gradually moving away from the source cell, the terminal device can determine cell#3 as the target cell; if the flight route of the terminal device is gradually approaching the source cell, the terminal device can determine cell#1 as the target cell.

[0181] The explicit indication of the distance information between each of the above-mentioned first cells and the source cell by the network device is only an example and does not impose any limitation on the protection scope of this application. In another way, the network device can implicitly indicate the distance information between each of the first cells and the source cell. For example, the protocol stipulates or indicates through the first indication information that the order of each of the first cells in the CHO configuration information corresponding to multiple first cells is arranged in ascending order of the distance from the source cell, that is, the first cell included in the CHO configuration information corresponding to the first cell is the farthest from the source cell, and the last cell is the closest to the source cell; or, the protocol stipulates or indicates through the second indication information that the order of each of the first cells in the CHO configuration information corresponding to multiple first cells is arranged in descending order of the distance from the source cell, that is, the first cell included in the CHO configuration information corresponding to the first cell is the closest to the source cell, and the last cell is the farthest from the source cell. There can also be other implicit indication methods, which will not be elaborated here.

[0182] Optionally, the above-mentioned first indication information or second indication information can be 1-bit information. For example, a value of 0 indicates that the order of each of the first cells in the CHO configuration information corresponding to the first cell is arranged in ascending order of the distance from the source cell; a value of 1 indicates that the order of each of the first cells in the CHO configuration information corresponding to the first cell is arranged in descending order of the distance from the source cell. It should be understood that the indication information being a 1-bit binary value is only an example and does not impose any limitation on the protection scope of this application. The indication information can also have other representation forms. For example, the first indication information or the second indication information can be a Boolean value or whether a certain cell is carried. The embodiments of this application do not make any limitations in this regard.

[0183] The distance between the above-mentioned terminal device and the source cell can be understood as: the straight-line distance between the terminal device and the source cell, the vertical distance between the terminal device and the source cell, the horizontal distance between the terminal device and the source cell, etc.; the distance between the above-mentioned first cell and the source cell can be understood as: the straight-line distance between the first cell and the source cell, the vertical distance between the first cell and the source cell, the horizontal distance between the first cell and the source cell, etc.

[0184] As another possible implementation manner, the terminal device determines a target cell from multiple second cells based on the signal quality change trend of the multiple second cells, where the signal quality change trend of the second cell includes the change trend of the signal quality of the second cell within the TTT corresponding to the second cell. For example, the change trend of the cell signal quality of the second cell within the TTT corresponding to the second cell, and / or, the change trend of the signal quality of the beam belonging to the second cell within the TTT corresponding to the second cell. For example, the target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend.

[0185] Optionally, the CHO configuration information corresponding to the first cell further includes a threshold value of signal quality. The threshold value of signal quality may include a cell signal quality threshold value (such as threshold value E) and / or a beam signal quality threshold value (such as threshold value F). If the signal quality of a certain cell shows an upward trend within the corresponding TTT and the change rate of the signal quality is greater than or equal to the threshold value of the signal quality, and the cell meets the CHO execution condition within the corresponding TTT, then the cell can be determined as the target cell. For example, if the cell signal quality of a certain cell shows an upward trend within the corresponding TTT and its signal quality change rate is greater than or equal to the cell signal quality threshold value (such as E), and the cell meets the CHO execution condition within the corresponding TTT, then the cell can be determined as the target cell; or, if the signal quality of at least one beam (such as M beams, where M is a positive integer greater than or equal to 1, and M can be agreed upon by the protocol or carried in the above RRC message containing the CHO configuration information) belonging to a certain cell shows an upward trend within the corresponding TTT and its signal quality change rate is greater than or equal to the beam signal quality threshold value (such as F), and the cell meets the CHO execution condition within the corresponding TTT, then the cell can be determined as the target cell; or, if the cell signal quality of a certain cell shows an upward trend within the corresponding TTT and its signal quality change rate is greater than or equal to the cell signal quality threshold value (such as E), and the signal quality of at least one beam (such as M beams, where M is a positive integer greater than or equal to 1, and M can be agreed upon by the protocol or carried in the above RRC message containing the CHO configuration information) belonging to the cell shows an upward trend within the corresponding TTT and its signal quality change rate is greater than or equal to the beam signal quality threshold value (such as F), and the cell meets the CHO execution condition within the corresponding TTT, then the cell can be determined as the target cell.

[0186] As another possible implementation, the terminal device determines the target cell from the multiple second cells based on the signal quality change trend of the multiple second cells that meet the CHO execution condition and the distance change trend of the terminal device relative to the source cell.

[0187] For example, when the distance of the terminal device from the source cell becomes larger, the terminal device selects, from the multiple second cells, a cell with an upward signal quality change trend from at least one second cell that is farther from the source cell as the target cell; or,

[0188] when the distance of the terminal device from the source cell becomes smaller, the terminal device selects, from the multiple second cells, a cell with an upward signal quality change trend from at least one second cell that is closer to the source cell as the target cell.

[0189] It should be understood that the above method of determining the target cell from multiple second cells can be combined with the above S410 and S420 (that is, first determine the first cell based on the path information as shown in S410 and S420, and then determine the target cell from the first cell as shown in S430).

[0190] In another possible embodiment, in S420, the network device sends the CHO configuration information corresponding to the first cell to the terminal device. In this scenario, the network device may determine the first cell without relying on the path information reported by the terminal device. In this embodiment, the above S410 is not executed. For example, the network device may determine the first cell according to the measurement report. After the terminal device receives the CHO configuration information corresponding to the first cell, it then determines the target cell from the first cell as shown in S430, which will not be elaborated in this application.

[0191] In the above method embodiments, the magnitudes of the sequence numbers of the above processes do not indicate the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application. And it is possible that not all of the operations in the above method embodiments need to be executed.

[0192] It should be understood that in the above method embodiments, the terminal device and / or the network device may execute some or all of the steps. These steps or operations are only examples, and the embodiments of this application may also include performing other operations or various variations of the operations.

[0193] It should also be understood that in various embodiments of this application, if there is no special description and logical conflict, the terms and / or descriptions between different embodiments may be consistent and may be cross-referenced. The technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0194] The above Figure 4 introduced in detail the method for handover provided by the embodiments of this application. Next, Figures 5 - 8 will introduce in detail the apparatus for handover provided by the embodiments of this application.

[0195] Refer to Figure 5 , Figure 5 which is a schematic diagram of the handover apparatus 500 provided by this application. As Figure 5 shown, the apparatus 500 includes a processing unit 510, a receiving unit 520, and a transmitting unit 530.

[0196] The transmitting unit 530 is configured to send the path information of the terminal device to the network device, where the path information is used to determine the first cell.

[0197] A receiving unit 520, configured to receive conditional handover (CHO) configuration information corresponding to a first cell from the network device;

[0198] A processing unit 510, configured to determine a target cell according to the CHO configuration information corresponding to the first cell.

[0199] The apparatus 500 corresponds to the terminal device in the method embodiments. The apparatus 500 may be the terminal device in the method embodiments, or a chip or functional module inside the terminal device in the method embodiments. The corresponding units of the apparatus 500 are configured to execute Figure 4 the corresponding steps executed by the terminal device in the shown method embodiments.

[0200] Among them, the processing unit 510 in the apparatus 500 is configured to execute the steps related to processing corresponding to the terminal device in the method embodiments. For example, execute Figure 4 step S430 of determining the target cell in

[0201] The receiving unit 520 in the apparatus 500 executes the receiving steps of the terminal device in the method embodiments. For example, execute Figure 4 step S420 of receiving the conditional handover (CHO) configuration information corresponding to the first cell sent by the network device in

[0202] A transmitting unit 530 in the apparatus 500 is configured to execute the transmitting steps of the terminal device. For example, execute Figure 4 step S410 of sending path information to the network device in . The receiving unit 520 and the transmitting unit 530 may form a transceiver unit, which has both receiving and transmitting functions. Among them, the processing unit 510 may be at least one processor. The transmitting unit 530 may be a transmitter or an interface circuit, and the receiving unit 520 may be a receiver or an interface circuit. The receiver and the transmitter may be integrated together to form a transceiver or an interface circuit.

[0203] Optionally, the apparatus 500 may further include a storage unit, configured to store data and / or signaling. The processing unit 510, the transmitting unit, and the receiving unit 520 may interact with or be coupled to the storage unit, for example, read or call the data and / or signaling in the storage unit, so that the methods in the above embodiments are executed.

[0204] The above units may exist independently, or may be integrated in whole or in part.

[0205] Refer to Figure 6 , Figure 6 which is a schematic structural diagram of a terminal device 600 applicable to the embodiments of the present application. The terminal device 600 may be applied to Figure 1 the system shown in Figure 6 For ease of description, Figure 6 only the main components of the terminal device are shown. AsFigure 6 As shown in the figure, the terminal device 600 includes a processor, a memory, a control circuit, an antenna, and an input / output device. The processor is used to control the antenna and the input / output device to transmit and receive signals. The memory is used to store computer programs. The processor is used to call and run the computer programs from the memory to execute the corresponding processes and / or operations performed by the terminal device in the method for registration proposed in this application. Details are not described herein again.

[0206] Those skilled in the art can understand that for the sake of convenience of description, Figure 6 only one memory and one processor are shown. In an actual terminal device, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, etc., and this application embodiment does not limit this.

[0207] See Figure 7 , Figure 7 is a schematic diagram of the device 700 for handover provided in this application. As Figure 7 shown, the device 700 includes a receiving unit 710 and a transmitting unit 720.

[0208] The receiving unit 710 is used to receive the path information of the terminal device from the terminal device, and the path information is used to determine a first cell;

[0209] The transmitting unit 720 is used to send the conditional handover CHO configuration information corresponding to the first cell to the terminal device.

[0210] The device 700 corresponds to the network device in the method embodiment. The device 700 may be the network device in the method embodiment, or a chip or a functional module inside the network device in the method embodiment. The corresponding units of the device 700 are used to execute Figure 4 the corresponding steps performed by the network device in the method embodiment shown in the figure.

[0211] The transmitting unit 720 in the device 700 executes the step of the network device sending in the method embodiment. For example, it executes Figure 4 the step S420 of sending the conditional handover CHO configuration information corresponding to the first cell to the terminal device in the figure.

[0212] The receiving unit 710 in the apparatus 700 is configured to perform the steps of receiving by a network device. For example, the step S410 of receiving path information sent by a terminal device. The apparatus 700 may further include a processing unit configured to perform steps corresponding to processing inside the network device. The receiving unit 710 and the transmitting unit 720 may form a transceiver unit, which has both receiving and transmitting functions. Among them, the processing unit may be at least one processor. The transmitting unit 720 may be a transmitter or an interface circuit. The receiving unit 710 may be a receiver or an interface circuit. The receiver and the transmitter may be integrated together to form a transceiver or an interface circuit.

[0213] Optionally, the apparatus 700 may further include a storage unit configured to store data and / or signaling. The processing unit, the transmitting unit 720, and the receiving unit 710 may interact with or be coupled to the storage unit, for example, read or call the data and / or signaling in the storage unit, so that the methods in the above embodiments are executed.

[0214] Each of the above units may exist independently, or may be integrated in whole or in part.

[0215] See Figure 8 , Figure 8 FIG. is a schematic structural diagram of a network device 800 applicable to the embodiments of the present application, which can be used to implement the functions of the network device in the above paging method. It can be a schematic structural diagram of a network device.

[0216] In one possible way, for example, in some implementation scenarios in a 5G communication system, the network device 800 may include a CU, a DU, and an AAU. Compared with the network device in an LTE communication system, which includes one or more radio frequency units, such as a remote radio unit (RRU) and one or more baseband units (BBUs):

[0217] The non-real-time part of the original BBU will be split out and redefined as a CU, which is responsible for processing non-real-time protocols and services. The partial physical layer processing functions of the BBU, the original RRU, and the passive antenna are combined into an AAU. The remaining functions of the BBU are redefined as a DU, which is responsible for processing physical layer protocols and real-time services. In short, the CU and the DU are distinguished by the real-time nature of the processing content, and the AAU is a combination of the RRU and the antenna.

[0218] The CU, the DU, and the AAU may be separated or co-located. Therefore, there will be multiple network deployment forms. One possible deployment form is the same as that of a traditional 4G network device, and the CU and the DU are deployed on the same hardware. It should be understood that Figure 8This is just an example and does not limit the protection scope of the present application. For example, the deployment form can also be that the DU is deployed in the 5G BBU computer room, the CU is centrally deployed or the DU is centrally deployed, and the CU is more highly centralized, etc.

[0219] The AAU 801 can implement the transceiver function and is called the transceiver unit 801, corresponding to the Figure 7 transmission unit 720 therein. Optionally, the transceiver unit 801 can also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it can include at least one antenna 8011 and a radio frequency unit 8012. Optionally, the transceiver unit 801 can include a receiving unit and a transmitting unit. The receiving unit can correspond to a receiver (or a receiver, a receiving circuit), and the transmitting unit can correspond to a transmitter (or a transmitter, a transmitting circuit). The CU and the DU 802 can implement the internal processing function and are called the processing unit 802. Optionally, the processing unit 802 can control the network device, etc., and can be called a controller. The AAU 801 and the CU and the DU 802 can be physically set together or physically separated.

[0220] In addition, the network device is not limited to Figure 8 the form shown. It can also be other forms: for example, including a BBU and an ARU, or including a BBU and an AAU; it can also be a CPE, or other forms, which are not limited in the present application.

[0221] It should be understood that Figure 8 the network device 800 shown can implement Figure 4 the functions of the network device involved in the method embodiments. The operations and / or functions of each unit in the network device 800 are respectively for implementing the corresponding processes executed by the network device in the method embodiments of the present application. To avoid repetition, the detailed description is appropriately omitted here. Figure 8 The structure of the exemplary network device is only one possible form and should not constitute any limitation to the embodiments of the present application. The present application does not exclude the possibility of other forms of network device structures that may appear in the future.

[0222] The embodiments of the present application also provide a communication system, which includes the aforementioned terminal device and network device.

[0223] The present application also provides a computer-readable storage medium, in which instructions are stored. When the instructions are run on a computer, the computer is enabled to execute each step executed by the terminal device in the method as Figure 4 shown above.

[0224] The present application also provides a computer-readable storage medium, in which instructions are stored. When the instructions are run on a computer, the computer is enabled to execute each step executed by the terminal device in the method asFigure 4 Each step performed by the network device in the method shown

[0225] This application also provides a computer program product containing instructions. When the computer program product runs on a computer, it causes the computer to execute each step performed by the terminal device in the method shown Figure 4 as shown

[0226] This application also provides a computer program product containing instructions. When the computer program product runs on a computer, it causes the computer to execute each step performed by the network device in the method shown Figure 4 as shown

[0227] This application also provides a chip, including a processor. The processor is configured to read and run a computer program stored in a memory to execute the corresponding operations and / or processes performed by the terminal device in the method for handover provided by this application. Optionally, the chip further includes a memory, which is connected to the processor through a circuit or wire. The processor is configured to read and execute the computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is configured to receive the data and / or information to be processed. The processor obtains the data and / or information from the communication interface and processes the data and / or information. The communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or a related circuit on the chip, etc. The processor may also be embodied as a processing circuit or a logic circuit

[0228] This application also provides a chip, including a processor. The processor is configured to read and run a computer program stored in a memory to execute the corresponding operations and / or processes performed by the network device in the method for handover provided by this application. Optionally, the chip further includes a memory, which is connected to the processor through a circuit or wire. The processor is configured to read and execute the computer program in the memory. Further optionally, the chip further includes a communication interface, and the processor is connected to the communication interface. The communication interface is configured to receive the data and / or information to be processed. The processor obtains the data and / or information from the communication interface and processes the data and / or information. The communication interface may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or a related circuit on the chip, etc. The processor may also be embodied as a processing circuit or a logic circuit

[0229] The above chip may also be replaced by a chip system, which will not be elaborated here

[0230] The terms "comprise" and "have" in this application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0231] Those of ordinary skill in the art will appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0232] Those skilled in the art can clearly understand that for the sake of convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0233] 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 illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0234] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0235] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0236] When the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0237] In addition, the term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after; the term "at least one" in this application can represent "one" and "two or more". For example, at least one of A, B, and C can represent: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, A and C exist simultaneously, C and B exist simultaneously, and A, B, and C exist simultaneously, these seven situations.

[0238] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for switching, characterized in that, Including: The terminal device sends path information of the terminal device to the network device, where the path information is used to determine a first cell, and the first cell is a candidate cell of the terminal device; The terminal device receives conditional handover (CHO) configuration information corresponding to the first cell from the network device, and the CHO configuration information corresponding to the first cell is related to height; The terminal device determines a target cell based on the CHO configuration information corresponding to the first cell, the height of the terminal device, and the signal quality of the first cell.

2. The method according to claim 1, wherein The CHO configuration information corresponding to the first cell includes at least one of CHO execution conditions and the following information: The cell radio network temporary identity (C-RNTI) allocated to the terminal device by the first cell, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, or the frequency information of the first cell.

3. The method according to claim 2, characterized in that The first cell includes one or more second cells that meet the corresponding CHO execution conditions. The terminal device determining a target cell based on the CHO configuration information corresponding to the first cell, the height of the terminal device, and the signal quality of the first cell includes: The terminal device determines a fifth cell based on the height of the terminal device; The terminal device determines one or more second cells that meet the CHO execution conditions from the fifth cell based on the CHO configuration information corresponding to the fifth cell; The terminal device determines the target cell according to the signal quality of the one or more second cells.

4. The method according to claim 3, wherein The terminal device determining the target cell according to the signal quality of the one or more second cells includes: The terminal device determines the target cell from the multiple second cells based on the signal quality change trend of the multiple second cells, where the signal quality change trend of the second cell includes the change trend of the signal quality of the second cell within the trigger time to trigger (TTT) corresponding to the second cell.

5. The method according to claim 4, wherein The target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend.

6. The method according to claim 5, wherein The CHO configuration information corresponding to the first cell further includes a threshold value, The target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend and the change rate of the signal quality is greater than or equal to the threshold value.

7. The method according to any one of claims 4 to 6, characterized in that The terminal device determining the target cell according to the signal quality of the one or more second cells includes: The terminal device determines the target cell from the one or more second cells according to the signal quality of the one or more second cells and the distance change trend of the terminal device relative to the source cell.

8. The method according to claim 7, wherein The terminal device determining the target cell from the one or more second cells based on the distance change trend of the terminal device relative to the source cell includes: When the distance of the terminal device from the source cell becomes larger, the terminal device selects the cell farthest from the source cell from the multiple second cells as the target cell; or, When the distance of the terminal device from the source cell becomes smaller, the terminal device selects, from the multiple second cells, the cell closest to the source cell as the target cell.

9. The method according to claim 7, characterized in that, The CHO configuration information corresponding to the first cell further includes distance information, which is used to indicate the distance between the first cell and the source cell.

10. A method for switching, characterized in that, Including: The network device receives the path information of the terminal device from the terminal device, and the path information is used to determine a first cell, and the first cell is a candidate cell of the terminal device; The network device sends the CHO configuration information corresponding to the first cell to the terminal device, and the CHO configuration information corresponding to the first cell is related to height; The CHO configuration information corresponding to the first cell is used to determine the target cell by combining the height of the terminal device and the signal quality of the first cell.

11. The method according to claim 10, wherein, The CHO configuration information corresponding to the first cell includes at least one of the CHO execution condition and the following information: The cell radio network temporary identity C-RNTI allocated by the first cell to the terminal device, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, or the frequency information of the first cell.

12. The method according to claim 10 or 11, characterized in that, The CHO configuration information corresponding to the first cell further includes distance information, which is used to indicate the distance between the first cell and the source cell.

13. A device for switching, characterized in that, Including: A sending unit, configured to send path information of a terminal device to a network device, where the path information is used to determine a first cell, and the first cell is a candidate cell of the terminal device; A receiving unit, configured to receive the CHO configuration information corresponding to the first cell from the network device, where the CHO configuration information corresponding to the first cell is related to height; A processing unit, configured to determine a target cell according to the CHO configuration information corresponding to the first cell, the height of the terminal device, and the signal quality of the first cell.

14. The device according to claim 13, wherein The CHO configuration information corresponding to the first cell includes at least one of the CHO execution condition and the following information: The cell radio network temporary identity C-RNTI allocated by the first cell to the terminal device, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, or the frequency information of the first cell.

15. The device according to claim 14, characterized in that, The first cell includes one or more second cells that meet the corresponding CHO execution condition, and the processing unit determines the target cell according to the CHO configuration information corresponding to the first cell, the height of the terminal device, and the signal quality of the first cell, including: The processing unit determines a fifth cell based on the height of the terminal device; The processing unit determines one or more second cells that meet the CHO execution condition from the fifth cell based on the CHO configuration information corresponding to the fifth cell; The processing unit determines the target cell according to the signal quality of the one or more second cells.

16. The device according to claim 15, characterized in that, The processing unit determines the target cell according to the signal quality of the one or more second cells, including: The processing unit determines the target cell from the multiple second cells based on the signal quality change trend of the multiple second cells, where the signal quality change trend of the second cell includes the change trend of the signal quality of the second cell within the TTT corresponding to the second cell.

17. The device according to claim 16, characterized in that, The target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend.

18. The device according to claim 17, wherein, The CHO configuration information corresponding to the first cell further includes a threshold value. The target cell is a cell among the multiple second cells whose signal quality change trend shows an upward trend and the change rate of the signal quality is greater than or equal to the threshold value.

19. The device according to any one of claims 16 to 18, characterized in that, The processing unit determines the target cell according to the signal quality of the one or more second cells, including: The processing unit determines the target cell from the one or more second cells according to the signal quality of the one or more second cells and the distance change trend of the terminal device relative to the source cell.

20. The device according to claim 19, characterized in that, The processing unit determines the target cell from the one or more second cells based on the distance change trend of the terminal device relative to the source cell, including: When the distance of the terminal device relative to the source cell becomes larger, the processing unit selects the cell farthest from the source cell as the target cell from the multiple second cells; or When the distance of the terminal device relative to the source cell becomes smaller, the processing unit selects the cell closest to the source cell as the target cell from the multiple second cells.

21. The device according to claim 19, wherein, The CHO configuration information corresponding to the first cell further includes distance information, and the distance information is used to indicate the distance between the first cell and the source cell.

22. A device for switching, characterized in that, Including: A receiving unit, configured to receive the path information of the terminal device from the terminal device, where the path information is used to determine a first cell, and the first cell is a candidate cell of the terminal device; A sending unit, configured to send the conditional handover (CHO) configuration information corresponding to the first cell to the terminal device, and the CHO configuration information corresponding to the first cell is related to height; The CHO configuration information corresponding to the first cell is used to determine a target cell by combining the height of the terminal device and the signal quality of the first cell.

23. The device according to claim 22, characterized in that, The CHO configuration information corresponding to the first cell includes at least one of the CHO execution condition and the following information: The cell radio network temporary identity (C-RNTI) allocated by the first cell to the terminal device, the resource information required for the terminal device to access the first cell, the index information corresponding to the first cell, the identification information of the first cell, or the frequency information of the first cell.

24. The device according to claim 22 or 23, characterized in that, The CHO configuration information corresponding to the first cell further includes distance information, and the distance information is used to indicate the distance between the first cell and the source cell.

25. A communication device, characterized in that, Including: A memory, which is used to store a computer program; A transceiver, which is used to execute the transceiver steps. A processor, the processor being configured to call and run the computer program from the memory, such that the communication device performs the method according to any one of claims 1-12.

26. A computer-readable storage medium, characterized in that, Comprising: The computer-readable medium stores a computer program; when the computer program runs on a computer, the computer is caused to perform the method according to any one of claims 1-12.

27. A communication system, characterized in that, Comprising: The means for switching according to any one of claims 13-21 and the means for switching according to any one of claims 22-24.

28. A computer program product, characterized in that, The computer program product includes a computer program, which when run, causes the method according to any one of claims 1-12 to be performed.

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