WO2020220309A1 - Method for cell handover and devices - Google Patents

Abstract

The present application provides a method for cell handover and devices, capable of reducing signaling overhead during a handover process of a terminal device. The method comprises: a terminal device obtains first information from a system message, the first information being used by the terminal device to perform cell handover.

Description

Method and equipment for cell handover Technical field

This application relates to the field of communications, and more specifically, to a method and device for cell handover.

Background technique

The New Radio (NR) system supports cell handover, for example, when a terminal device moves from one cell to another, or due to wireless communication service load adjustment, activation operation and maintenance, equipment failure, etc., in order to ensure continuous communication The quality and service quality need to transfer the communication link between the terminal device and the source base station to the target base station, that is, perform the handover process.

For high-speed mobile terminal equipment, the terminal equipment needs to perform cell handover frequently. And in some scenarios, the motion trajectory of the terminal device is determined, such as a high-speed rail scenario. In this case, the source base station can send the configuration information of the target cell to the terminal device in advance, so that the terminal device can switch between cells. The configuration information of the target cell can be used to perform handover. However, how the source base station instructs the terminal equipment to perform cell handover is a problem that needs to be solved urgently.

Summary of the invention

The present application provides a method and device for cell handover, which can reduce signaling overhead in the handover process of terminal equipment.

In a first aspect, a method for cell handover is provided, including: a terminal device obtains first information from a system message, and the first information is used by the terminal device to perform cell handover.

In a second aspect, a method for cell handover is provided, including: a network device sends a system message to a terminal device, the system message includes first information, and the first information is used by the terminal device to perform cell handover.

In a third aspect, a terminal device is provided, which is used to execute the method in the foregoing first aspect or each of its implementation manners.

Specifically, the terminal device includes a functional module for executing the method in the foregoing first aspect or each implementation manner thereof.

In a fourth aspect, a network device is provided, which is configured to execute the method in the second aspect or its implementation manners.

Specifically, the network device includes a functional module for executing the method in the foregoing second aspect or each implementation manner thereof.

In a fifth aspect, a terminal device is provided, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the above-mentioned first aspect or each of its implementation modes.

In a sixth aspect, a network device is provided, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the above-mentioned second aspect or each of its implementation modes.

In a seventh aspect, a device is provided for implementing any one of the first aspect to the second aspect or the method in each implementation manner thereof.

Specifically, the device includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the device executes any one of the above-mentioned first aspect to the second aspect or any of its implementation modes method.

In an eighth aspect, a computer-readable storage medium is provided for storing a computer program that enables a computer to execute any one of the first aspect to the second aspect or the method in each implementation manner thereof.

In a ninth aspect, a computer program product is provided, which includes computer program instructions that cause a computer to execute any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

In a tenth aspect, a computer program is provided, which when running on a computer, causes the computer to execute any one of the above-mentioned first aspect to the second aspect or the method in each implementation manner thereof.

Through the above technical solution, the network equipment can send relevant information for cell handover to the terminal equipment through system messages, thereby avoiding the network equipment from sending all relevant information for cell handover to the terminal equipment through dedicated signaling, which can save dedicated Signaling overhead.

Description of the drawings

Fig. 1 is a schematic diagram of a wireless communication system applied in an embodiment of the present application.

Fig. 2 is a schematic diagram of a contention-based random access process provided by an embodiment of the present application.

Fig. 3 is a schematic diagram of a non-contention-based random access process provided by an embodiment of the present application.

Figure 4 is a schematic diagram of a cell handover method provided by an embodiment of the present application.

Fig. 5 is a schematic diagram of a handover process based on a condition trigger provided by an embodiment of the present application.

Fig. 6 is a schematic flowchart of a method for cell handover provided by an embodiment of the present application.

FIG. 7 is a schematic block diagram of a terminal device provided by an embodiment of the present application.

Fig. 8 is a schematic block diagram of a network device provided by an embodiment of the present application.

FIG. 9 is a schematic structural diagram of a communication device provided by an embodiment of the present application.

FIG. 10 is a schematic structural diagram of a device provided by an embodiment of the present application.

FIG. 11 is a schematic block diagram of a communication system provided by an embodiment of the present application.

Detailed ways

Fig. 1 is a schematic diagram of a system 100 according to an embodiment of the present application.

As shown in FIG. 1, the terminal device 110 is connected to the first network device 130 under the first communication system and the second network device 120 under the second communication system. For example, the first network device 130 is a Long Term Evolution (Long Term Evolution). , A network device under LTE), the second network device 120 is a network device under a New Radio (NR).

Wherein, the first network device 130 and the second network device 120 may include multiple cells.

It should be understood that FIG. 1 is an example of a communication system in an embodiment of the present application, and the embodiment of the present application is not limited to that shown in FIG. 1.

As an example, the communication system to which the embodiment of the present application is adapted may include at least multiple network devices under the first communication system and/or multiple network devices under the second communication system.

For example, the system 100 shown in FIG. 1 may include one main network device under the first communication system and at least one auxiliary network device under the second communication system. At least one auxiliary network device is respectively connected to the one main network device to form multiple connections, and is connected to the terminal device 110 to provide services for it. Specifically, the terminal device 110 may simultaneously establish a connection through the main network device and the auxiliary network device.

Optionally, the connection established between the terminal device 110 and the main network device is the main connection, and the connection established between the terminal device 110 and the auxiliary network device is the auxiliary connection. The control signaling of the terminal device 110 may be transmitted through the main connection, and the data of the terminal device 110 may be transmitted through the main connection and the auxiliary connection at the same time, or may be transmitted only through the auxiliary connection.

As another example, the first communication system and the second communication system in the embodiment of the present application are different, but the specific types of the first communication system and the second communication system are not limited.

For example, the first communication system and the second communication system may be various communication systems, such as: Global System of Mobile Communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Time Division Duplex (TDD) ), Universal Mobile Telecommunication System (UMTS), etc.

The main network device and the auxiliary network device may be any access network device.

Optionally, in some embodiments, the access network device may be a base station (Base Transceiver) in the Global System of Mobile Communications (GSM) system or Code Division Multiple Access (CDMA). Station, BTS), it can also be a base station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, or an evolved base station in a Long Term Evolution (LTE) system (Evolutional Node B, eNB or eNodeB).

Optionally, the access network device may also be a Next Generation Radio Access Network (NG RAN), or a base station (gNB) in an NR system, or a cloud radio access network (Cloud The radio controller in Radio Access Network, CRAN, or the access network device can be a relay station, access point, in-vehicle device, wearable device, or in the future evolution of Public Land Mobile Network (PLMN) Network equipment, etc.

In the system 100 shown in FIG. 1, the first network device 130 is taken as the main network device, and the second network device 120 is taken as an auxiliary network device as an example.

The first network device 130 may be an LTE network device, and the second network device 120 may be an NR network device. Or, the first network device 130 may be an NR network device, and the second network device 120 may be an LTE network device. Or both the first network device 130 and the second network device 120 may be NR network devices. Or the first network device 130 may be a GSM network device, a CDMA network device, etc., and the second network device 120 may also be a GSM network device, a CDMA network device, etc. Or the first network device 130 may be a Macrocell, and the second network device 120 may be a Microcell, Picocell, Femtocell, or the like.

Optionally, the terminal device 110 may be any terminal device, and the terminal device 110 includes but is not limited to:

Connected via wired lines, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection; and/or another data connection/network; and/ Or via a wireless interface, such as for cellular networks, wireless local area networks (WLAN), digital TV networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters; and/or another terminal device A device configured to receive/send communication signals; and/or Internet of Things (IoT) equipment. A terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", a "wireless terminal" or a "mobile terminal". Examples of mobile terminals include, but are not limited to, satellites or cellular phones; Personal Communications System (PCS) terminals that can combine cellular radio phones with data processing, fax, and data communication capabilities; can include radio phones, pagers, Internet/intranet PDA with internet access, web browser, memo pad, calendar, and/or Global Positioning System (GPS) receiver; and conventional laptop and/or palmtop receivers or others including radio phone transceivers Electronic device. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in the future evolution of PLMN, etc.

It should be understood that the terms "system" and "network" in this article are often used interchangeably in this article.

In the embodiment of the present application, the network equipment provides services for the cell, and the terminal equipment communicates with the network equipment through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell. The cell may be a network equipment (for example, The cell corresponding to the base station. The cell can belong to a macro base station or a base station corresponding to a small cell. The small cell here can include: Metro cell, Micro cell, Pico Cells, Femto cells, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.

It should be understood that the method in the embodiment of the present application can be used to transmit various types of services.

For example, eMBB, which targets users to obtain multimedia content, services and data, and its demand is growing very rapidly. Another example is eMBB. Since eMBB may be deployed in different scenarios, such as indoors, urban areas, and rural areas, the differences in capabilities and requirements are relatively large. Therefore, detailed analysis can be combined with specific deployment scenarios. Another example is URLLC. Typical applications of URLLC include: industrial automation, power automation, telemedicine operations (surgery), traffic safety protection, etc. Typical features of mMTC include: high connection density, small data volume, delay-insensitive services, low-cost modules and long service life.

In some special scenarios, the terminal device needs to initiate random access to the network device to establish a connection with the network device. There are many events that trigger a terminal device to perform random access, such as in the initial access process of the terminal device; in the reconstruction process of the terminal device; when the terminal device has uplink data to send, but the uplink out of synchronization is detected ; When the terminal device has uplink data to send, but there is no scheduling request (scheduling request, SR) resource; when the terminal device needs to perform cell handover; when the base station has downlink data to send, but the uplink out of synchronization is detected Case.

The random access of the terminal device may include contention-based random access and non-contention-based random access.

Refer to Figure 2 for the contention-based random access process.

S210. The terminal device sends a message 1 (message1, MSG1) to the network device on the random access channel, where the MSG1 contains a random access preamble. Wherein, the MSG1 may be a physical layer message.

S220. After receiving MSG1, the network device may send MSG2 on a downlink shared channel (DL-SCH), where MSG2 may be a random access response (Random Access Response, RAR). Among them, the MSG2 may be a MAC layer message.

Among them, the RAR response carries the timing advance (TA) adjustment of uplink transmission and the available uplink resource information, as well as the temporary cell radio network temporary identifier (T-CRNTI), that is, the temporary cell radio network temporary identifier (T-CRNTI). CRNTI.

Optionally, the RAR response may be generated by the media access control (Media Access Control, MAC) layer of the network device. One MSG2 can simultaneously respond to random access requests from multiple terminal devices.

In S230, after receiving MSG2, the terminal device determines whether it belongs to its own RAR message, and when it determines that it belongs to its own RAR message, it sends message 3 (message3, MSG3) in the uplink resource designated by MSG2, and this MSG3 carries the terminal device. Specific RNTI. Among them, the MSG3 may be an RRC layer message.

In step 240, after receiving the MSG3, the network device may send an MSG4 message to the terminal device. Among them, the MSG4 includes contention resolution messages and uplink transmission resources allocated by the network equipment to the terminal equipment. Among them, the MSG4 may be a MAC layer message.

After receiving the MSG4, the terminal device can detect whether the specific RNTI sent in the MSG3 is included in the contention resolution message sent by the network device. If it is included, it indicates that the random access procedure of the terminal device is successful; otherwise, it is considered that the random procedure fails. After the random access process fails, the terminal device needs to initiate the random access process again from the first step.

Optionally, MSG1 and MSG2 may not use the HARQ mechanism, while MSG3 and MSG4 may use the HARQ mechanism.

If one random access attempt fails, the terminal device can also initiate the next random machine access attempt until the maximum number of retransmissions and/or maximum retransmission time allowed by the network side is reached.

The terminal device generally performs random access by sending a preamble to the network device. If the terminal device sends the preamble for the first time, if the current random access fails, the terminal device can send the random access preamble to the network device for the second time, and the transmission power of the second preamble can be the first The transmit power of a preamble after a power rise. The step length of the power increase may be configured by the network device, or may also be pre-configured in the terminal device.

The non-contention-based random access process may be as shown in FIG. 3, for example.

S310. The network device sends MSG0 to the terminal device. The MSG0 may include a preamble configuration message, which is used to indicate a preamble for random access. The MSG0 may be a physical layer message.

S320. The terminal device sends MSG 1 to the network device, where the MSG1 includes the random access preamble in S310. The MSG1 may be a physical layer message.

S330. The network device sends MSG2 to the terminal device, where the MSG2 may be a random access response message. The MSG2 may be a MAC layer message.

In the non-contention-based random access process, the terminal device can obtain non-competitive random access resources through RRC signaling and/or PDCCH signaling, and perform random access on the non-competitive random access resources.

The following takes the handover process as an example to describe the random access process of the terminal device. The embodiment of the application does not specifically limit the communication scenario of the handover process. For example, it may be an LTE system or an NR system.

When the terminal equipment that is using the network service moves from the source cell to the coverage of the target cell, or due to wireless transmission service load adjustment, activation operation and maintenance, equipment failure, etc., in order to ensure the continuity of terminal equipment communication and the quality of service , The communication system needs to transfer the communication link between the terminal equipment and the source cell to the target cell, that is, perform the cell handover process. The source cell can be understood as the cell to which the terminal device is currently connected, and the target cell can be understood as the cell to which the terminal device is about to switch.

The embodiment of the present application does not specifically limit the manner in which the terminal device performs cell handover. For example, the terminal device may perform intra-site handover, that is, the source cell and the target cell belong to the same base station. For another example, the terminal device may also perform handover between the base station and the base station, that is, the source cell and the target cell belong to different base stations.

The embodiment of the present application does not limit the interface used for cell handover between the base station and the base station. For example, it can be cell handover based on X2 interface or Xn interface, or it can be cell handover based on S1 interface or N2 interface.

Taking the Xn interface as an example, the handover process of the terminal device can be divided into the following three stages: handover preparation, handover execution and handover completion.

The handover preparation may include the terminal device measuring and reporting the link quality, sending a handover request to the source base station, and receiving a handover command sent by the source base station.

The handover execution may include that the terminal device immediately executes the handover process after receiving the handover command sent by the source base station. For example, the connection with the source cell can be disconnected and the connection with the target cell can be completed (such as performing random access, sending an RRC handover complete message to the target base station, etc.), serial number (SN) state transfer and data forwarding, etc.

The completion of the handover may include the target cell and the access and mobility management function (AMF) and the user plane function (UPF) performing link handover, releasing the UE context of the source base station, and so on.

For the NR system, link switching and releasing the UE context of the source base station can be performed by AMF and UPF. For the LTE system, link switching and releasing the UE context of the source base station can be performed by the MME. The embodiments of the present application do not specifically limit the applied system, and may be applied to an LTE system or an NR system.

Specifically, as shown in Figure 4, the handover preparation phase (401-405) may include:

In 401, the source base station triggers the terminal device to perform neighboring cell measurement, so that the terminal device can measure the neighboring cell and report the measurement result to the source base station.

In 402, the source base station evaluates the measurement result reported by the terminal device and decides whether to trigger a handover.

In 403, if the source base station decides to trigger a handover, it can send a handover request to the target base station.

In 404, after receiving the handover request sent by the source base station, the target base station may start admission according to the service information carried by the source base station, and perform radio resource configuration.

In 405, the target base station sends a handover request confirmation message to the source base station, and returns the admission result and wireless resource configuration information in the target base station to the source base station. At this point, the handover preparation phase is complete.

In the second stage, the handover execution stage (406-408) may include:

In 406, after the source base station receives the handover request confirmation message of the target base station, it can trigger the terminal device to perform handover.

In 407, the source base station can forward the buffered data, the data packet in transit, the system serial number of the data, etc. to the target base station. And, the target base station can buffer the data received from the source base station

In addition, the terminal device can disconnect from the source base station and establish synchronization with the target base station.

In 408, the terminal device synchronizes to the target base station. At this point, the switching execution phase is complete.

The third stage, the handover completion stage (409-412) can include:

In 409, the target base station sends a path switching request to a mobility management function (Access and Mobility Management Function, AMF).

In 410, after receiving the path switching request of the target base station, the AMF performs path switching with the User Plane Function (UPF) to clear the path mark of the user plane of the source base station.

In 411, after the path switching is completed, the AMF may send a path switching confirmation message to the target base station.

In 412, the target base station sends a terminal device context release message to the source base station to notify the source base station that the handover is successful, and trigger the source base station to release the terminal device context. At this point, the switch is complete.

The terminal device immediately starts the T304 timer after receiving the handover command, and starts downlink synchronization to the target cell, obtains the master indication block (MIB) information of the target cell, and then initiates random access. During the random access process, multiple preamble retransmissions are allowed until the random access is successful. Further, if the T304 timer expires, indicating that the handover fails, the terminal device can directly trigger the RRC connection re-establishment process.

The handover process in this way is a handover process completely controlled by the network. However, for terminal equipment under high-speed movement or high-frequency conditions, frequent switching is required. If the cell handover is performed in the above manner, the terminal device may be too late or unable to send measurement reports and receive handover commands due to high-speed movement to an area with poor coverage. This will cause the terminal device to fail to perform cell handover and cause service interruption and other problems.

The embodiment of the present application provides a handover process based on conditional triggering, which can avoid the problem that the handover preparation time is too long and the terminal device is too late to handover and it is too late to perform the cell handover.

The network device can configure the handover command for the terminal device in advance, and the network device can also allocate the target base station to the terminal device in advance. The handover command may include a condition for triggering the handover of the terminal device. When it is detected that the target cell meets the handover condition, the terminal device may initiate an access request to the target base station.

The switching trigger condition may be a trigger condition based on signal quality. For example, the handover trigger condition may include that the signal quality of the source cell is lower than the first threshold. If the terminal device detects that the signal quality of the source cell is lower than the first threshold, the terminal device can perform cell handover. For another example, the handover trigger condition may include that the signal quality of the target cell is higher than the second threshold. If the terminal device detects that the signal quality of the target cell is higher than the second threshold, the terminal device may perform handover to the target cell. For another example, the handover trigger condition may include that the signal quality of the source cell is lower than the first threshold and the signal quality of the target cell is higher than the second threshold. Only when these two conditions are met at the same time, the terminal device can perform handover to the target cell .

Wherein, the first threshold value and the second threshold value may be the same or different. The embodiments of the present application do not specifically limit this.

The signal quality of a cell can be characterized by reference signal receiving power (RSRP). The terminal device can receive the reference signal of the source cell and the target cell, and measure the received power of the reference signal to obtain the RSRP corresponding to the cell. The larger the RSRP value, the better the signal quality of the cell; the smaller the RSRP value, the worse the signal quality of the cell.

The following describes the process of condition-based switching with reference to FIG. 5.

510: The source base station sends measurement configuration information to the terminal device.

520: The terminal device sends a measurement report to the source base station.

530: The source base station and the target base station exchange handover preparation information.

540: The source base station sends a handover command to the terminal device.

The handover command includes condition information for the cell or beam.

550: When the condition is met, the terminal device synchronizes with the target base station (the terminal device accesses the target base station).

However, for a specific handover scenario, such as a high-speed rail scenario, the network device also needs to configure multiple target cells in advance for the terminal device. However, for multiple terminal devices on the high-speed rail, the network device needs to configure multiple target cells for the multiple terminal devices respectively. However, the operation trajectory of the terminal equipment on the high-speed rail is determined. There will be a problem that the network equipment repeatedly sends the same information to multiple terminal equipment. If the network equipment uses dedicated signaling to configure multiple target cells to multiple terminal equipment separately, it will Cause a waste of signaling resources.

For non-terrestrial network communication systems, similar problems also exist. For example, for a low earth orbit (LEO) system, since LEO satellites are not stationary relative to the ground, but are moving at high speed, their moving speed relative to the ground can reach 7.75km/s, or 27216km/h, And the moving speed is much higher than the speed of ordinary ground or air vehicles.

Therefore, for terminal equipment using LEO satellites for communication, due to the relative movement between the LEO satellite and the terminal equipment on the ground, the problem of satellite switching by the terminal equipment will be caused. And because the trajectory of the satellite is determined, according to the principle of relative motion, the trajectory of the terminal device relative to the LEO satellite is determined. Therefore, for LEO satellite communication systems, condition-based handover can also be used to solve the problem of satellite movement. LEO satellites can configure other LEO satellites and handover conditions to the terminal equipment in advance, so that the terminal equipment can switch to the target LEO satellite when it detects that the handover conditions are met.

However, compared to the general terrestrial communication system, the LEO communication system faces more severe problems:

1. In terms of time, the movement speed of LEO is higher than that of ordinary vehicles, reaching the order of 100x, that is, within the same time range, the LEO communication system needs to process 100x movement events.

2. In space, the coverage of LEO satellites is much larger than that of ordinary cells on the ground network, and its coverage can reach tens or hundreds of kilometers. Depending on the user density using LEO satellite communications in the coverage area, the number of single-cell users of non-terrestrial networks can reach a larger value. Similarly, due to the large coverage of LEO satellites, there are more terminal devices using the same LEO satellite, and one LEO satellite has to handle more mobile events of terminal devices.

Therefore, for LEO satellites, the trajectory of the LEO satellite is determined. Therefore, if the LEO satellite uses dedicated signaling to configure multiple target LEO satellites for each terminal device, there will be repeated sending of the same information to multiple terminal devices. Compared with terrestrial communication systems, LEO communication systems have more serious problems. Because within the same time, LEO satellites need to configure target LEO satellites to more terminal devices, which will cause more signaling waste.

Therefore, for the terminal equipment in a deterministic high-speed movement state, how the network equipment instructs the terminal equipment to perform cell handover has become an urgent problem to be solved at present.

The embodiment of the present application provides a method for cell handover, which can reduce the signaling overhead in the handover process. As shown in Figure 6, the method includes S610.

S610. The network device sends a system message to the terminal device, where the system message includes first information, and the first information is used by the terminal device to perform cell handover.

The network device may broadcast the system message to the terminal device. After receiving the system message, the terminal device may obtain the first information from the system message to perform cell handover. Optionally, the network device may refer to the source base station.

The first information may include at least one of the following information: configuration information of the candidate target cell, T304 timer, dedicated configuration information for random access, and handover conditions for handover to the candidate target cell.

The candidate target cell may include one target cell or multiple target cells. The network device can configure one or more target cells for the terminal device in advance, so that the terminal device can switch to the target cell.

The candidate target cell may include a non-terrestrial network (NTN) cell, such as an LEO cell; the candidate target cell may also be a terrestrial network cell, which is not specifically limited in the embodiment of the application.

The configuration information of the candidate target cell may include at least one of the following information: uplink related configuration, downlink related configuration, synchronization signal block (synchronization signal block, SSB) related configuration, and reference signal related configuration. The configuration information of the candidate target cell may include the configuration information of the primary and secondary cells.

The T304 timer can be started when the terminal device receives a handover command. After receiving the handover command, the terminal device can initiate random access to the target cell. For the handover process based on conditional handover, the T304 timer can also be started when the terminal device determines that the handover condition is satisfied and triggers the handover action. After the T304 timer expires, it indicates that the random access of the terminal device fails. The T304 timers of different target cells can be the same or different.

The dedicated configuration information used for random access is used by the terminal device to initiate random access to the target cell, and the dedicated configuration information used for random access of different target cells may be the same or different. The dedicated configuration information for random access may include, for example, a random access preamble.

The handover condition of the candidate target cell may include at least one of the following conditions: the signal quality of the candidate target cell and the position of the terminal device relative to the target cell.

Regarding the signal quality of the target cell, the cell handover is performed. When the terminal device detects that the signal quality of the target cell meets certain handover conditions, it can be handed over to the target cell. For the specific method, please refer to the above description and will not be repeated here. .

Regarding the position of the terminal device relative to the target cell, the embodiment of the present application does not specifically limit the handover condition that triggers the handover. For example, the terminal device will switch to the target cell as long as it enters the coverage area of the target cell. For another example, the terminal device may switch to the target cell after entering the range of the target cell and being located at the edge of the source cell.

Of course, the handover condition of the candidate target cell can be a combination of the above conditions. For example, when the terminal device performs handover, it not only needs to consider the position of the terminal device relative to the target cell, but also needs to determine whether the signal quality of the target cell meets the condition.

For high-speed mobile terminal equipment, the network equipment can configure the terminal equipment with relevant information for cell handover in advance. In the embodiments of the present application, the relevant information that the network device configures to the terminal device for cell handover is not all configured through dedicated signaling, but part or all of the related information can be configured through system messages, which can reduce dedicated signaling. Order overhead.

For a terminal device on a high-speed rail, since the running track of all terminal devices is the same, the candidate target cell configured by the network device to the terminal device may also be the same. For example, a network device can send the same candidate target cell configuration information to all terminal devices through a system message, instead of sending the same information to each terminal device separately, because the system message is sent to the terminal device by broadcast. Therefore, this method can save signaling overhead.

For non-terrestrial communication systems, such as the LEO satellite communication system, a LEO satellite can configure the first information to all terminal devices within its coverage area through system messages, without the need to repeatedly send the first information to the terminal devices, which can save signaling overhead .

As an implementation manner, the network device may also send dedicated signaling to the terminal device. The dedicated signaling may include at least one of the following information: identification information of the terminal device in the candidate target cell, T304 timer, used for Dedicated configuration information for random access and handover conditions for handover to candidate target cells.

Among them, the dedicated signaling can be understood as a message sent by the network device to the terminal device in a unicast manner.

The identification information of the terminal device in the candidate target cell may be, for example, a cell radio network temporary identifier (C-RNTI).

The C-RNTI may be sent by the target base station to the source base station after the source base station sends the handover request to the target base station, and then the source base station may send the C-RNTI to the terminal device through dedicated signaling. Since different terminal devices have different C-RNTIs in the same target base station, the source base station sends C-RNTI information to the terminal device through dedicated signaling. When the terminal device needs to switch to the target base station, it can use the C-RNTI to perform random access to the target base station.

System messages and dedicated signaling may include the same information, for example, may both include second information, where the second information includes at least one of the following information: T304 timer, dedicated configuration information for random access, and handover to Handover conditions of candidate target cells. The system message and the dedicated signaling may also include different information. For example, the system message may include the configuration information of the candidate target cell, and the dedicated signaling may include the identification information of the terminal device in the candidate target cell.

In the embodiment of the present application, the network device may broadcast the configuration information of the candidate target cell to the terminal device through system information, and send the terminal device's identification information in the candidate target cell in dedicated signaling to the terminal device. For T304 timer, dedicated configuration information for random access, and handover conditions for handover to candidate target cells, network equipment can be broadcast to terminal equipment in system messages, or can be sent to terminal equipment using dedicated signaling.

For some information included in both the system message and the dedicated signaling, that is, the dedicated signaling includes some information already contained in the system message. The terminal equipment can use the information in the system message for cell handover, or use the information in the dedicated signaling. Perform cell handover.

As an example, the terminal device may preferentially use the information in the dedicated signaling for cell handover. Assuming that both the system message and the dedicated signaling include the T304 timer, the terminal device preferentially uses the T304 timer in the dedicated signaling for cell handover.

After receiving the system message and the dedicated signaling, the terminal equipment can perform cell handover according to the information in the dedicated signaling. For information that is not in the dedicated signaling, the terminal device can obtain it from the system message to perform cell handover.

As another example, the dedicated signaling may also include first indication information. The network device may indicate to the terminal device which message to use for cell handover through the first indication information. For example, the first indication information may indicate whether the terminal device needs Cell handover is performed based on the information in the system message. Still taking the T304 timer as an example, both the system message and the dedicated signaling include the T304 timer. The network device can also configure the first indication information in the dedicated signaling. If the first indication information indicates that the terminal device is based on the T304 in the system information If the timer is used for cell handover, the terminal device uses the T304 timer of the system message to perform cell handover; if the first indication information indicates that the terminal device does not perform cell handover based on the T304 timer in the system message, or instructs the terminal device to perform cell handover based on dedicated signaling If the T304 timer is used for cell handover, the terminal equipment uses the T304 timer in dedicated signaling to perform cell handover.

The dedicated configuration information used for random access and the handover conditions for handover to the candidate target cell. If this information is included in the system message and dedicated signaling, the above method can also be used to determine which message the terminal device should use. Information to switch.

The method provided in the embodiments of the present application can be applied in a handover process based on conditional handover, and can also be used in a handover process based on unconditional handover.

For the handover method based on conditional handover, after receiving the system message sent by the network device, the terminal device can detect the target cell according to the handover condition included in the system message. When it is detected that the target cell meets the handover condition, the terminal device can Directly initiate random access to the target cell that meets the conditions to switch to the target cell.

For the handover method based on unconditional handover, the network device can still configure the first information to the terminal device through the system message in advance. When a terminal device needs to switch, it can use the traditional switching method based on unconditional switching to send a switching request to the network device, and the network device can send a switching command to the terminal device. The difference is that the switching command can only include instructions for the terminal Which target cell the device should switch to without sending the configuration information of the target cell to the terminal device. After receiving the handover command, the terminal device can obtain the configuration information of the corresponding target cell from the system message according to the instructions in the handover command to perform cell handover. This way can also save the signaling overhead in the handover process.

The candidate target cell may include multiple target cells, that is, the system message may include the configuration information of multiple candidate target cells, and the network device may indicate to the terminal device which target cell configuration information is used to perform handover through dedicated signaling. For example, the dedicated signaling may include second indication information, and the second indication information may be used to instruct the terminal device to switch to the first target cell among the multiple target cells. After receiving the dedicated signaling, the terminal device may perform cell handover according to the system message and/or related information of the first target cell included in the dedicated signaling.

As an example, for a condition-based handover process, after receiving the dedicated signaling, the terminal device may first switch to the first target cell according to the handover condition included in the system message and/or dedicated signaling, After the cell meets the handover condition, it is handed over to the first target cell. When handing over to the first target cell, the terminal device may initiate random access to the first target cell according to related information of the first target cell included in the system message and/or dedicated signaling.

As another example, for an unconditional handover process, after receiving the dedicated signaling, the terminal device can directly send a message to the first target cell based on the system message and/or related information of the first target cell included in the dedicated signaling. The cell initiates random access. The dedicated signaling may be a handover command.

The system message in the embodiment of the present application may be a system message dedicated to handover. For example, the system message may be a system message dedicated to carrying the first information. The system message dedicated to handover may refer to that the system message is different from other system messages already in the protocol, or that the system message is not to reuse the existing system message, but to add one on the basis of the existing system message System messages are dedicated to carrying information for terminal equipment to switch.

Optionally, the system message may be a system information block (system information block, SIB) message.

The system message may be a system message dedicated to bear the NTN system, that is, the system message may be a system message for a terminal device using the NTN system. Alternatively, the system message may be a system message dedicated to carrying a ground network system, that is, the system message may be a system message for a terminal device using the ground system.

Before the terminal device receives the system message, the network device can also send the receiving position of the system message to the terminal device. For example, the network device may send third indication information to the terminal device, where the third indication information is used to indicate the location of the time domain resource and/or frequency domain resource, the location of the time domain resource and/or the frequency domain resource for receiving the system message It can also be referred to as configuration parameters of time domain resources and/or frequency domain resources. After receiving the third indication information, the terminal device may receive the response system message at the position of the time domain resource and/or the frequency domain resource indicated by the third indication information.

The configuration parameters of the time domain resource and/or the frequency domain resource, for example, may include measurement timing configurations (MTC) of the SSB.

The third indication information may be used to indicate that the terminal device in the connected state receives the system message.

If it is a non-terrestrial network communication system, after the terminal device recognizes that the cell is an NTN cell (such as an LEO cell), it can actively receive system messages after switching to the cell.

The cell where the terminal device is located before handover is the first cell, and the system message may be received by the terminal device after it is connected to the first cell, that is, the terminal device may be sent according to the base station where the first cell is located after being connected to the first cell The third indication information is to receive the system message sent by the base station of the first cell.

The embodiment of the present application does not specifically limit the first cell, as long as the first cell is the cell where the terminal device is before handover. For example, the first cell may be the cell where the terminal device is currently located, or the first cell may be any cell where the terminal device was before handing over to the cell where it is currently located. In other words, the system message received by the terminal device can be used in subsequent handover processes.

For example, the cell where the terminal equipment is currently located is cell 1, and the cell where the terminal equipment is located before handover to cell 1 is cell 0. The terminal device needs to switch from cell 1 to cell 2 due to high-speed movement. The terminal device obtains the relevant information of cell 2 through a system message. The system message can be sent by the base station where cell 1 is located or the cell 0 is located. Sent by the base station.

Similarly, the indication information of the location of time domain resources and frequency domain resources for receiving system messages may be sent by the base station where cell 1 is located, or may be sent by the base station where cell 0 is located.

When a network device broadcasts related information of multiple target cells, it may broadcast the related information of multiple target cells in the same system message, which can save broadcast signaling overhead, thereby further saving signaling overhead. Alternatively, the network device may also use different system messages to broadcast relevant information of different target cells, that is, each system message only broadcasts relevant information of one target cell, which can provide more flexible network configuration.

The network equipment in the embodiments of the present application may refer to a source base station, which may also be referred to as a source cell base station. The source base station can be used to broadcast system messages to terminal devices and can also send dedicated signaling to terminal devices. The network equipment in the embodiment of the present application may also refer to a target base station, and the target base station may also be referred to as a target cell base station, and the target base station may be used for random access by terminal equipment.

To facilitate understanding, the application embodiments are described in detail below in conjunction with specific embodiments.

For highly mobile terminal equipment, the cell where the terminal equipment is currently located is cell 0, the base station where cell 0 is located is base station 0, and base station 0 detects that the terminal equipment is moving at a high speed, and the operating trajectory of the terminal equipment is determined. Then the base station 0 can configure the terminal equipment with multiple target cells along the trajectory according to the operating trajectory of the terminal equipment. The related information of the multiple target cells may be, for example, the first information described above, and the related information of the multiple target cells may be sent to the terminal device through a system message. Base station 0 may also send third indication information to the terminal device. The third indication information is used to instruct the terminal device to receive the configuration parameters of the time domain resource and/or frequency domain resource of the system message. After the terminal device receives the third indication information, Receive system messages on corresponding time domain resources and/or frequency domain resources.

Assuming that the multiple target cells may include cell 1 and cell 2, the relevant information of cell 1 may include information required for handover to cell 1, for example, it may include handover conditions that need to be met for handover to cell 1, and initiate random access to cell 1. Required information, etc. Similarly, the related information of cell 2 may include information required for handover to cell 2, for example, it may include handover conditions that need to be met for handover to cell 2, information required for initiating random access to cell 2, and so on. Among them, the base station where cell 1 is located may be referred to as base station 1, and the base station where cell 2 is located may be referred to as base station 2.

The related information of cell 1 and the related information of cell 2 can be carried in the same system message. For example, base station 0 can send system messages of cell 1 and cell 2 to terminal equipment by broadcasting a system message. Or, the related information of cell 1 and cell 2 may be carried in different system messages. For example, base station 0 uses the first system message to broadcast cell 1 related information, and the second system message uses the second system message to broadcast cell 2 related information.

If the terminal equipment reaches the edge of cell 0 and/or enters the coverage area of cell 1, base station 0 can send the terminal equipment an instruction to switch to cell 1, and the terminal equipment will switch to cell 1 according to the instruction of base station 0; or the terminal The device can switch to cell 1 after judging that cell 1 meets the handover condition according to the handover condition for handover to cell 1 in the system information. Before switching to cell 1, the terminal device can obtain the relevant parameters of cell 1 from the previously obtained system message, and switch to cell 1 based on the relevant parameters of cell 1.

As the terminal equipment moves, the terminal equipment will reach the edge of cell 1 and/or enter the coverage area of cell 2. Base station 1 can send instructions to the terminal equipment to switch to cell 2, and the terminal equipment can follow the instructions of base station 1. Instruct to switch to cell 1; or the terminal device can also switch to cell 2 after judging that cell 2 meets the corresponding handover condition according to the handover condition for handover to cell 2 in the system message sent by base station 0.

The wireless communication method according to the embodiment of the present application is described in detail above. The device according to the embodiment of the present application will be described below in conjunction with FIG. 7 to FIG. 11. The technical features described in the method embodiment are applicable to the following device embodiments.

FIG. 7 is a schematic block diagram of a terminal device according to an embodiment of the present application. The terminal device may be any of the terminal devices described above. The terminal device 700 in FIG. 7 includes an obtaining unit 710, wherein:

The obtaining unit 710 is configured to obtain first information from a system message, where the first information is used by the terminal device to perform cell handover.

Optionally, the first information includes at least one of the following information: configuration information of the candidate target cell, T304 timer, dedicated configuration information for random access, and handover conditions for handover to the candidate target cell.

Optionally, the terminal device 700 further includes a receiving unit 720, configured to receive dedicated signaling sent by the network device, where the dedicated signaling includes at least one of the following information: the terminal device is in the candidate target cell The identification information of the T304 timer, the dedicated configuration information for random access and the handover conditions for handover to the candidate target cell.

Optionally, the candidate target cell includes a non-terrestrial network NTN cell.

Optionally, the NTN cell includes a low earth orbit LEO cell.

Optionally, the terminal device 700 further includes a processing unit 730, configured to perform cell handover according to information in the dedicated signaling.

Optionally, both the system message and the dedicated signaling include second information, and the second information packet includes at least one of the following information: T304 timer, dedicated configuration information for random access and handover For a handover condition to a candidate target cell, the terminal device 700 further includes a processing unit 730, configured to perform cell handover according to the second information in the dedicated signaling when cell handover is performed.

Optionally, the dedicated signaling further includes first indication information, and the first indication information is used to indicate whether the terminal device performs cell handover based on the information in the system message.

Optionally, both the system message and the dedicated signaling include second information, and the second information includes at least one of the following information: T304 timer, dedicated configuration information for random access and handover Handover conditions to the candidate target cell.

Optionally, the candidate target cell includes multiple target cells, and the dedicated signaling includes second indication information, and the second indication information is used to instruct the terminal device to switch to one of the multiple target cells. The first target cell.

Optionally, the terminal equipment 700 further includes a processing unit 730, configured to: switch to the first target cell according to the dedicated signaling and/or the handover condition included in the system information. The first target cell.

Optionally, the terminal device 700 further includes a receiving unit 720, configured to receive third indication information sent by the network device, where the third indication information is used to indicate the time domain resource and/or frequency domain of the system message The location of the resource.

Optionally, the system message is a system message dedicated to carrying the first information.

Optionally, the system message is a system message dedicated to the NTN system.

Optionally, the cell where the terminal device was located before the handover is the first cell, and the terminal device 700 further includes a receiving unit 720, configured to receive the system message after connecting to the first cell.

FIG. 8 is a schematic block diagram of a terminal device according to an embodiment of the present application. The terminal device may be any of the terminal devices described above. The terminal device 800 in FIG. 8 includes a sending unit 810, wherein:

The sending unit 810 is configured to send a system message to a terminal device, where the system message includes first information, and the first information is used by the terminal device to perform cell handover.

Optionally, the first information includes at least one of the following information: configuration information of the candidate target cell, T304 timer, dedicated configuration information for random access, and handover conditions for handover to the candidate target cell.

Optionally, the sending unit 810 is further configured to: send dedicated signaling to the terminal device, where the dedicated signaling includes at least one of the following information: identification information of the terminal device in the candidate target cell, T304 timer, dedicated configuration information for random access and handover conditions for handover to candidate target cells.

Optionally, the candidate target cell includes a non-terrestrial network NTN cell.

Optionally, the NTN cell includes a low earth orbit LEO cell.

Optionally, the dedicated signaling includes first indication information, and the first indication information is used to indicate whether the terminal device performs cell handover based on the information in the system message.

Optionally, both the system message and the dedicated signaling include second information, and the second information includes at least one of the following information: T304 timer, dedicated configuration information for random access and handover Handover conditions to the candidate target cell.

Optionally, the candidate target cell includes multiple target cells, the dedicated signaling includes second indication information, and the second indication information is used to instruct the terminal device to switch to one of the multiple candidate cells. The first target cell.

Optionally, the sending unit 810 is further configured to send third indication information to the terminal device, where the third indication information is used to indicate the location of the time domain resource and/or the frequency domain resource of the system message.

Optionally, the system message is a system message dedicated to carrying the first information.

Optionally, the system message is a system message dedicated to the NTN system.

Optionally, the sending unit 810 is further configured to send the system message to the terminal device after the terminal device is connected to the first cell.

FIG. 9 is a schematic structural diagram of a communication device 900 provided by an embodiment of the present application. The communication device 900 shown in FIG. 9 includes a processor 910, and the processor 910 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 9, the communication device 900 may further include a memory 920. The processor 910 may call and run a computer program from the memory 920 to implement the method in the embodiment of the present application.

The memory 920 may be a separate device independent of the processor 910, or may be integrated in the processor 910.

Optionally, as shown in FIG. 9, the communication device 900 may further include a transceiver 930, and the processor 910 may control the transceiver 930 to communicate with other devices. Specifically, it may send information or data to other devices, or receive other devices. Information or data sent by the device.

The transceiver 930 may include a transmitter and a receiver. The transceiver 930 may further include an antenna, and the number of antennas may be one or more.

Optionally, the communication device 900 may specifically be a network device of an embodiment of the application, and the communication device 900 may implement the corresponding process implemented by the network device in each method of the embodiment of the application. For brevity, details are not repeated here .

Optionally, the communication device 900 may specifically be a mobile terminal/terminal device of an embodiment of the present application, and the communication device 900 may implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application. For simplicity , I won’t repeat it here.

Fig. 10 is a schematic structural diagram of a device according to an embodiment of the present application. The apparatus 1000 shown in FIG. 10 includes a processor 1010, and the processor 1010 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in FIG. 10, the device 1000 may further include a memory 1020. The processor 1010 can call and run a computer program from the memory 1020 to implement the method in the embodiment of the present application.

The memory 1020 may be a separate device independent of the processor 1010, or it may be integrated in the processor 1010.

Optionally, the device 1000 may further include an input interface 1030. The processor 1010 can control the input interface 1030 to communicate with other devices or devices, and specifically, can obtain information or data sent by other devices or devices.

Optionally, the device 1000 may further include an output interface 1040. The processor 1010 can control the output interface 1040 to communicate with other devices or devices, specifically, can output information or data to other devices or devices.

Optionally, the device can be applied to the network equipment in the embodiments of the present application, and the device can implement the corresponding processes implemented by the network equipment in the various methods of the embodiments of the present application. For brevity, details are not described herein again.

Optionally, the device can be applied to the mobile terminal/terminal device in the embodiment of this application, and the device can implement the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of this application. For brevity, here is No longer.

It should be understood that the device mentioned in the embodiments of the present application may be a chip, and the chip may also be referred to as a system-level chip, a system-on-chip, a system-on-chip, or a system-on-chip.

FIG. 11 is a schematic block diagram of a communication system 1100 according to an embodiment of the present application. As shown in FIG. 11, the communication system 1100 includes a terminal device 1110 and a network device 1120.

Among them, the terminal device 1110 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 1120 can be used to implement the corresponding functions implemented by the network device in the above method. .

It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The aforementioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synchlink DRAM, SLDRAM) ) And Direct Rambus RAM (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

It should be understood that the foregoing memory is exemplary but not restrictive. For example, the memory in the embodiment of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. In other words, the memory in the embodiments of the present application is intended to include, but is not limited to, these and any other suitable types of memory.

The embodiment of the present application also provides a computer-readable storage medium for storing computer programs.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, here No longer.

Optionally, the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application , For the sake of brevity, I will not repeat it here.

The embodiments of the present application also provide a computer program product, including computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, it is not here. Repeat it again.

Optionally, the computer program product can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, For brevity, I won't repeat them here.

The embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity , I won’t repeat it here.

Optionally, the computer program can be applied to the mobile terminal/terminal device in the embodiment of the present application. When the computer program runs on the computer, the computer executes each method in the embodiment of the present application. For the sake of brevity, the corresponding process will not be repeated here.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

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 may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. In response to this understanding, the technical solution of this application essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims (64)

1. A method for cell handover, characterized in that it comprises:

   The terminal device obtains the first information from the system message, and the first information is used for the terminal device to perform cell handover.
2. The method according to claim 1, wherein the first information includes at least one of the following information: configuration information of candidate target cells, T304 timer, dedicated configuration information for random access and handover to Handover conditions of candidate target cells.
3. The method according to claim 1 or 2, wherein the method further comprises:

   The terminal device receives the dedicated signaling sent by the network device, and the dedicated signaling includes at least one of the following information: the identification information of the terminal device in the candidate target cell, the T304 timer, and the random access Dedicated configuration information and handover conditions for handover to candidate target cells.
4. The method according to claim 3, wherein the candidate target cell comprises a non-terrestrial network NTN cell.
5. The method according to claim 4, wherein the NTN cell comprises a low earth orbit LEO cell.
6. The method according to any one of claims 3-5, wherein the method further comprises:

   The terminal equipment performs cell handover according to the information in the dedicated signaling.
7. The method according to any one of claims 3-6, wherein the system message and the dedicated signaling both include second information, and the second information includes at least one of the following information: T304 timer, dedicated configuration information for random access and handover conditions for handover to candidate target cells, the method further includes:

   When the terminal device performs cell handover, cell handover is performed according to the second information in the dedicated signaling.
8. The method according to any one of claims 3-5, wherein the dedicated signaling further includes first indication information, and the first indication information is used to indicate whether the terminal device is based on the system The information in the message performs cell handover.
9. The method according to any one of claims 8, wherein the system message and the dedicated signaling both include second information, and the second information includes at least one of the following information: T304 timing Device, dedicated configuration information for random access and handover conditions for handover to candidate target cells.
10. The method according to any one of claims 3-9, wherein the candidate target cell includes multiple target cells, the dedicated signaling includes second indication information, and the second indication information is used for Instruct the terminal device to switch to the first target cell among the multiple target cells.
11. The method according to claim 10, wherein the method further comprises:

    The terminal device switches to the first target cell according to the handover condition for handover to the first target cell included in the dedicated signaling and/or the system information.
12. The method according to any one of claims 1-11, wherein the method further comprises:

    The terminal device receives third indication information sent by the network device, where the third indication information is used to indicate the location of the time domain resource and/or the frequency domain resource of the system message.
13. The method according to any one of claims 1-12, wherein the system message is a system message dedicated to carrying the first information.
14. The method according to any one of claims 1-13, wherein the system message is a system message dedicated to the NTN system.
15. The method according to any one of claims 1-14, wherein the cell where the terminal device is located before the handover is the first cell, and the method further comprises:

    The terminal device receives the system message after connecting to the first cell.
16. A method for cell handover, characterized in that it comprises:

    The network device sends a system message to the terminal device, where the system message includes first information, and the first information is used by the terminal device to perform cell handover.
17. The method according to claim 16, wherein the first information includes at least one of the following information: configuration information of candidate target cells, T304 timer, dedicated configuration information for random access, and handover to Handover conditions of candidate target cells.
18. The method according to claim 16 or 17, wherein the method further comprises:

    The network device sends dedicated signaling to the terminal device, and the dedicated signaling includes at least one of the following information: identification information of the terminal device in the candidate target cell, T304 timer, used for random access The dedicated configuration information and the handover conditions for handover to the candidate target cell.
19. The method according to claim 18, wherein the candidate target cell comprises a non-terrestrial network NTN cell.
20. The method according to claim 19, wherein the NTN cell comprises a low earth orbit LEO cell.
21. The method according to any one of claims 18-20, wherein the dedicated signaling includes first indication information, and the first indication information is used to indicate whether the terminal device is based on the system message The information in the cell switch.
22. The method according to claim 21, wherein both the system message and the dedicated signaling include second information, and the second information includes at least one of the following information: T304 timer for Dedicated configuration information for random access and handover conditions for handover to candidate target cells.
23. The method according to any one of claims 18-22, wherein the candidate target cell includes multiple target cells, the dedicated signaling includes second indication information, and the second indication information is used for Instruct the terminal device to switch to the first target cell among the multiple candidate cells.
24. The method according to any one of claims 16-23, wherein the method further comprises:

    The network device sends third indication information to the terminal device, where the third indication information is used to indicate the location of the time domain resource and/or the frequency domain resource of the system message.
25. The method according to any one of claims 16-24, wherein the system message is a system message dedicated to carrying the first information.
26. The method according to any one of claims 16-25, wherein the system message is a system message dedicated to the NTN system.
27. The method according to any one of claims 16-26, wherein the cell where the terminal device was before the handover is the first cell, and the method further comprises:

    The network device sends the system message to the terminal device after the terminal device is connected to the first cell.
28. A terminal device, characterized in that it comprises:

    The acquiring unit is configured to acquire first information from a system message, where the first information is used by the terminal device to perform cell handover.
29. The terminal device according to claim 26, wherein the first information includes at least one of the following information: configuration information of candidate target cells, T304 timer, dedicated configuration information for random access and handover Handover conditions to the candidate target cell.
30. The terminal device according to claim 28 or 29, wherein the terminal device further comprises a receiving unit, configured to:

    Receive dedicated signaling sent by a network device, where the dedicated signaling includes at least one of the following information: identification information of the terminal device in the candidate target cell, T304 timer, dedicated configuration information for random access, and Handover conditions for handover to the candidate target cell.
31. The terminal device according to claim 30, wherein the candidate target cell comprises a non-terrestrial network NTN cell.
32. The terminal device according to claim 31, wherein the NTN cell comprises a low earth orbit LEO cell.
33. The terminal device according to any one of claims 30-32, wherein the terminal device further comprises a processing unit, configured to:

    Perform cell handover according to the information in the dedicated signaling.
34. The terminal device according to any one of claims 30-33, wherein the system message and the dedicated signaling both include second information, and the second information packet includes at least one of the following information : T304 timer, dedicated configuration information for random access and handover conditions for handover to candidate target cells, the terminal equipment also includes a processing unit for:

    When cell handover is performed, cell handover is performed according to the second information in the dedicated signaling.
35. The terminal device according to any one of claims 30-32, wherein the dedicated signaling further includes first indication information, and the first indication information is used to indicate whether the terminal device is based on the The information in the system message performs cell handover.
36. The terminal device according to claim 35, wherein the system message and the dedicated signaling both include second information, and the second information includes at least one of the following information: T304 timer, used Dedicated configuration information for random access and handover conditions for handover to candidate target cells.
37. The terminal device according to any one of claims 30-36, wherein the candidate target cell includes multiple target cells, the dedicated signaling includes second indication information, and the second indication information is used for To instruct the terminal device to switch to the first target cell of the plurality of target cells.
38. The terminal device according to claim 37, wherein the terminal device further comprises a processing unit, configured to:

    Switch to the first target cell according to the handover condition for handover to the first target cell included in the dedicated signaling and/or the system information.
39. The terminal device according to any one of claims 28-38, wherein the terminal device further comprises a receiving unit, configured to:

    Receiving third indication information sent by the network device, where the third indication information is used to indicate the location of the time domain resource and/or the frequency domain resource of the system message.
40. The terminal device according to any one of claims 28-39, wherein the system message is a system message dedicated to carrying the first information.
41. The terminal device according to any one of claims 28-40, wherein the system message is a system message dedicated to the NTN system.
42. The terminal device according to any one of claims 28-41, wherein the cell where the terminal device is located before the handover is the first cell, and the terminal device further comprises a receiving unit, configured to:

    After connecting to the first cell, receiving the system message.
43. A network device, characterized in that it comprises a sending unit for:

    Send a system message to a terminal device, where the system message includes first information, and the first information is used by the terminal device to perform cell handover.
44. The network device according to claim 43, wherein the first information comprises at least one of the following information: configuration information of candidate target cells, T304 timer, dedicated configuration information for random access and handover Handover conditions to the candidate target cell.
45. The network device according to claim 43 or 44, wherein the sending unit is further configured to:

    Send dedicated signaling to the terminal device, the dedicated signaling includes second information, and the second information includes at least one of the following information: identification information of the terminal device in the candidate target cell, T304 timer , Dedicated configuration information for random access and handover conditions for handover to candidate target cells.
46. The network device according to claim 45, wherein the candidate target cell comprises a non-terrestrial network NTN cell.
47. The network device of claim 46, wherein the NTN cell comprises a low earth orbit LEO cell.
48. The network device according to any one of claims 45-47, wherein the dedicated signaling includes first indication information, and the first indication information is used to indicate whether the terminal device is based on the system The information in the message performs cell handover.
49. The network device according to claim 48, wherein both the system message and the dedicated signaling include second information, and the second information includes at least one of the following information: T304 timer, used Dedicated configuration information for random access and handover conditions for handover to candidate target cells.
50. The network device according to any one of claims 45-49, wherein the candidate target cell includes multiple target cells, the dedicated signaling includes second indication information, and the second indication information is used for Instructing the terminal device to switch to the first target cell of the plurality of candidate cells.
51. The network device according to any one of claims 43-50, wherein the sending unit is further configured to:

    Send third indication information to the terminal device, where the third indication information is used to indicate the location of the time domain resource and/or the frequency domain resource of the system message.
52. The network device according to any one of claims 43-51, wherein the system message is a system message dedicated to carrying the first information.
53. The network device according to any one of claims 43-52, wherein the system message is a system message dedicated to the NTN system.
54. The network device according to any one of claims 43-53, wherein the sending unit is further configured to:

    After the terminal device is connected to the first cell, the system message is sent to the terminal device.
55. A terminal device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any one of claims 1 to 15 The method described in one item.
56. A network device, comprising: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and execute any of claims 16 to 27 The method described in one item.
57. A device, characterized by comprising: a processor, configured to call and run a computer program from a memory, so that a device installed with the device executes the method according to any one of claims 1 to 15.
58. An apparatus, characterized by comprising: a processor, configured to call and run a computer program from a memory, so that a device installed with the apparatus executes the method according to any one of claims 16 to 27.
59. A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 1 to 15.
60. A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 16 to 27.
61. A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 1 to 15.
62. A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 16 to 27.
63. A computer program, wherein the computer program enables a computer to execute the method according to any one of claims 1 to 15.
64. A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 16 to 27.

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