Cell handover method, apparatus, storage medium, and electronic apparatus

Abstract

The embodiments of the present disclosure provide a cell handover method, an apparatus, a storage medium, and an electronic apparatus. The method comprises: a UE sending a physical layer measurement report to a network device, so that the network device determines the initiation of a layer 1 or layer 2-triggered mobility (LTM) handover; the UE receiving first signaling information sent by the network device, wherein the first signaling information is used for instructing the UE to perform handover to a target cell, the first signaling information comprises configuration indicating information of the target cell, and the first signaling information is layer 1 or layer 2 signaling; and determining a random access mode in the target cell, and performing handover to the target cell according to the random access mode.

Description

Cell switching method, device, storage medium and electronic device

[0001] Cross-references to related publications

[0002] The present disclosure is based on Chinese Patent Publication No. 2024104434253 filed on April 12, 2024, entitled “Cell Switching Method, Device, Storage Medium and Electronic Device”, and claims the priority of the patent disclosure, and all the disclosed contents thereof are incorporated into the present disclosure by reference. Technical Field

[0003] The embodiments of the present disclosure relate to the field of communications, and in particular, to a cell switching method, device, storage medium, and electronic device. Background Art

[0004] The UE to Network relay (U2N Relay) technology in the related art is a communication method in which a relay UE (Relay UE) provides relay communication for a remote UE (Remote UE), allowing the remote UE to access a radio access network device through the relay UE. The relay UE and the remote UE communicate via the PC5 interface. The wireless communication link between the relay UE and the remote UE is called the sidelink (SL). The relay UE and the network device communicate wirelessly via the Uu interface. The wireless communication link between the relay UE and the network device can be called the Uu link.

[0005] Terminal devices can implement L1 / L2 handover of the primary cell through layer L1 / L2 triggered mobility (LTM). Unlike existing cell handovers triggered based on layer 3 (L3, i.e., RRC layer), LTM may have low latency during handover (HO), where the UE may perform HO based only on L1 / L2 indications (e.g., MAC CE), where a secondary cell or even a non-serving cell from the candidate LTM set may be promoted to the new primary cell. When a UE undergoes LTM handover, the UE loses connection with the original cell, resulting in service interruption for the UE.

[0006] Regarding the problem in related technologies that when a UE undergoes LTM handover, the UE loses connection with the original cell, which causes service interruption for the UE, no effective solution has yet been proposed. Summary of the Invention

[0007] Embodiments of the present disclosure provide a cell switching method, device, storage medium, and electronic device.

[0008] According to an aspect of the embodiments of the present disclosure, a cell switching method is provided, including: sending, by a UE, a physical layer measurement report to a network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobile LTM switching; receiving, by the UE, first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, and the first signaling information includes configuration indication information of the target cell; the first signaling information is layer 1 or layer 2 signaling; determining a random access mode in the target cell according to the random access mode, and switching to the target cell according to the random access mode.

[0009] According to another aspect of the embodiments of the present disclosure, a cell switching method is also provided, applied to a network device, including: receiving a physical layer measurement report sent by a UE, and initiating a layer 1 or layer 2 triggered mobile LTM switching according to the physical layer measurement report; sending, by the network device, first signaling information to the UE, to instruct the UE to determine a random access mode in a target cell according to random access resources indicated by configuration indication information of the target cell included in the first signaling information, and to switch to the target cell according to the random access mode, wherein the first signaling information is used to instruct the UE to switch to the target cell, and the first signaling information is layer 1 or layer 2 signaling.

[0010] According to another aspect of the embodiments of the present disclosure, a cell switching device is also provided, applied to a UE, including: a first sending module configured to send a physical layer measurement report to a network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobile LTM switching; a first receiving module configured to receive first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, and the first signaling information includes configuration indication information of the target cell; the first signaling information is layer 1 or layer 2 signaling; a switching module configured to determine a random access mode in the target cell according to the random access mode, and to switch to the target cell according to the random access mode.

[0011] According to another aspect of the embodiments of the present disclosure, a cell switching device is also provided, applied to a network device, including: a second receiving module configured to receive a physical layer measurement report sent by a UE, and to initiate a layer 1 or layer 2 triggered mobile LTM switching according to the physical layer measurement report; a second sending module configured to send first signaling information to the UE, to instruct the UE to determine a random access mode in a target cell according to random access resources indicated by configuration indication information of the target cell included in the first signaling information, and to switch to the target cell according to the random access mode, wherein the first signaling information is used to instruct the UE to switch to the target cell, and the first signaling information is layer 1 or layer 2 signaling.

[0012] According to a further aspect of the embodiments of the present disclosure, a computer readable storage medium is also provided, and the storage medium stores a computer program. The computer program is configured to perform the cell handover method described in any of the above aspects when executed.

[0013] According to a further aspect of the embodiments of the present disclosure, an electronic device is also provided, and the electronic device comprises a memory and a processor. The memory stores a computer program, and the processor is configured to perform the cell handover method described in any of the above aspects by using the computer program.

[0014] According to a further aspect of the embodiments of the present disclosure, a computer program product is also provided, and the computer program product comprises a computer program. The computer program is configured to perform the steps of the cell handover method described in any of the above aspects when executed by a processor. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are included to provide a further understanding of the present disclosure and constitute a part of the present disclosure, illustrate embodiments of the present disclosure and serve to explain the principles of the present disclosure, and do not limit the present disclosure in any way. In the drawings:

[0016] FIG. 1 is a hardware structure block diagram of a UE of a cell handover method according to an embodiment of the present disclosure;

[0017] FIG. 2 is a flowchart of a cell handover method applied to a user equipment (UE) according to an embodiment of the present disclosure;

[0018] FIG. 3 is a flowchart of a cell handover method applied to a network device according to an embodiment of the present disclosure;

[0019] FIG. 4 is an architecture diagram of a communication system according to an embodiment of the present disclosure;

[0020] FIG. 5 is an interaction diagram of a cell handover method according to an embodiment of the present disclosure;

[0021] FIG. 6 is an interaction diagram of a cell handover method corresponding to step S505 according to an embodiment of the present disclosure;

[0022] FIG. 7 is an interaction diagram of a cell handover method corresponding to step S506 according to an embodiment of the present disclosure;

[0023] FIG. 8 is another flowchart of a cell handover method according to an embodiment of the present disclosure;

[0024] FIG. 9 is yet another flowchart of a cell handover method according to an embodiment of the present disclosure;

[0025] FIG. 10 is a structure block diagram of a cell handover apparatus applied to a user equipment (UE) according to an embodiment of the present disclosure;

[0026] FIG. 11 is a structural block diagram of a cell switching device applied to a network device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] In order to make persons skilled in the art better understand the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by persons skilled in the art without creative work should fall within the protection scope of the present disclosure.

[0028] It should be noted that the terms "first", "second" and the like in the description and claims of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices.

[0029] The method embodiments provided in the embodiments of the present disclosure can be executed in a UE or a network device. Taking an example of running in a UE, FIG. 1 is a hardware structural block diagram of a UE of a cell switching method according to an embodiment of the present disclosure. As shown in FIG. 1, the UE can include one or more (only one is shown in FIG. 1) processors 202 (the processor 202 can include but is not limited to a microprocessor unit (MPU) or a programmable logic device (PLD)) and a memory 204 configured to store data. In an exemplary embodiment, the above-mentioned UE can further include a transmission device 206 configured to have a communication function and an input and output device 208. Those skilled in the art can understand that the structure shown in FIG. 1 is only schematic, which does not limit the structure of the above-mentioned computer terminal. For example, the computer terminal can further include more or less components than those shown in FIG. 1, or have a different configuration with the same function or more than the function shown in FIG. 1.

[0030] The memory 204 can be configured to store computer programs, such as software programs of application software and modules, for example, a computer program corresponding to the cell handover method in the embodiments of the present disclosure, and the processor 202 can perform various functional applications and data processing, that is, implement the method described above, by running the computer program stored in the memory 204. The memory 204 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 204 can further include a memory remotely arranged with respect to the processor 202, and the remote memory can be connected to the computer terminal through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0031] The transmission device 206 is configured to receive or send data via a network. A specific example of the network can include a wireless network provided by a communication provider of the computer terminal. In one example, the transmission device 206 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 206 can be a radio frequency (RF) module, which is configured to communicate with the Internet in a wireless manner.

[0032] FIG. 2 is a flowchart of a cell handover method applied to a user equipment (UE) according to an embodiment of the present disclosure. As shown in FIG. 2, the steps of the method include:

[0033] In step S202, the UE sends a physical layer measurement report to a network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobile LTM handover.

[0034] In step S204, the UE receives first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to hand over to a target cell, and the first signaling information includes configuration indication information of the target cell; and the first signaling information is layer 1 or layer 2 signaling.

[0035] In step S206, a random access mode in the target cell is determined, and the UE is handed over to the target cell according to the random access mode.

[0036] By the embodiments of the present disclosure, a physical layer measurement report is sent to a network device, so that the network device initiates a layer 1 or layer 2 triggered mobile LTM handover, and then first signaling information sent by a network device in which a source cell is located is received, and then a random access mode in a target cell indicated by the network device in the first signaling information is determined, and the UE is switched to the target cell according to the random access mode. The problem that when the UE performs LTM handover, the UE loses the connection with the original cell, and the service of the UE is interrupted is solved. Then, when the UE performs LTM handover, the UE is switched to the target cell according to the random access model corresponding to the first signaling information sent by the network device, and the problem of service interruption of the UE is avoided.

[0037] Optionally, the network device indicates whether the UE performs uplink and downlink synchronization with the candidate target cell in advance (before receiving the first signaling information). If yes, for uplink synchronization, the UE selects a TA acquisition mode of the UE from network acquisition or UE measurement acquisition according to the network device indication information. The network acquisition means that the UE sends a preamble to the candidate cell, but does not wait to receive RAR information, and the TA is calculated by the candidate network device and indicated to the UE. The UE measurement TA means that the UE measures the timing information of the source cell, and obtains the TA of the candidate cell through the time difference with the candidate cell. For downlink synchronization, the UE performs according to the transmission configuration indication (TCI) state indicated by the network device. After receiving the first signaling, the UE can deactivate the TCI state not indicated in the first signaling information. For the UE performing LTM handover, the UE does not participate in the measurement interval or discontinuous reception DRX operation.

[0038] In one example embodiment, the method further comprises: in a case where the random access mode of the target cell is successfully ended or uplink data transmission is successful, the UE determines that the mobile LTM handover is successful.

[0039] In one example embodiment, before the UE receives the first signaling information sent by the network device, the method further comprises: the UE measures timing advance information of the target cell, and realizes uplink and downlink synchronization with the target cell.

[0040] In one example embodiment, the method further comprises: in a case where the UE is a relay UE, after receiving the first signaling information sent by the network device in which the source cell is located, sending switching indication information to a remote UE according to the first signaling information, to instruct the remote UE to switch to the target cell or determine whether to initiate relay UE reselection.

[0041] In actual operation, when the relay UE initiates a random access procedure in the target cell, in order to increase the coverage range of the random access preamble, the preamble can be repeatedly sent multiple times. If the target cell resource quality indicated in the LTM switching command decreases, the random access mode and the preamble repetition number need to be adjusted. In an example embodiment, the random access mode and the preamble repetition number can be adjusted by the following method: determining the random access mode and the preamble repetition number, wherein the random access mode includes at least one of the following: collision-based random access CBRA, collision-free random access CFRA, and RACH-less random access; the preamble repetition number is notified to the UE by the network device; and switching to the target cell according to the random access mode.

[0042] In an example embodiment, the method further includes that the quality threshold value corresponding to the preamble repetition number is configured by the network device, and different preamble repetition numbers correspond to different quality threshold values; when the beam quality measured by the UE is less than or equal to a preset threshold value, the preamble repetition number corresponding to the quality threshold value of the beam quality is selected.

[0043] In an example embodiment, the method further includes that the random access mode is determined according to at least one of the following: timing advance information, and channel quality of the target cell; wherein if the timing advance information is included in the first signaling information, or the UE has obtained the timing advance information before moving the LTM switching, the RACH-less mode is adopted; if the UE has not obtained the timing advance information, the CFRA mode is adopted, and when the CFRA mode is selected, if the channel quality of the target cell is lower than a specified threshold, the CBRA mode is adopted.

[0044] In an example embodiment, the method further includes that for the RACH-less mode, the preamble repetition number is not required; the random access CBRA mode is indicated by system broadcast to indicate the threshold value corresponding to different preamble repetition numbers; for the collision-free random access CFRA mode, the preamble repetition number corresponding to the collision-free random access CFRA mode is indicated by the network device, the collision-free random access CFRA mode is allowed to fall back to the collision-based random access CBRA mode, and the preamble repetition number when falling back is unchanged.

[0045] In an example embodiment, the method further includes that the first signaling information further includes a timing advance command TAC of the target cell; wherein in the case that the UE receives the first signaling information including the TAC, it is determined that the UE adopts the RACH-less mode to switch to the target cell.

[0046] In an example embodiment, the method further comprises: in a case that the network device configures the UE to measure a target cell TA, and the UE has measured the target cell TA, then switching to the target cell in a RACH-less mode.

[0047] In an example embodiment, the method further comprises: in a case that the LTM switching coexists with conditional handover (CHO) and conditional primary / secondary cell addition or change (CPAC) at the time of switching, indicating to the network device to perform the LTM switching or the CHO; wherein, when the UE performs the LTM switching, a RRC layer switching command sent by the network device is allowed to be received and indicated.

[0048] FIG. 3 is a flowchart of a cell switching method applied to a network device according to an embodiment of the present disclosure, as shown in FIG. 3, steps of the method include:

[0049] Step S302, receiving a physical layer measurement report sent by a user equipment (UE), and initiating a layer 1 or layer 2 triggered mobile LTM switching according to the physical layer measurement report.

[0050] Step S304, sending first signaling information to the UE to instruct the UE to determine a random access mode in a target cell according to random access resources indicated by configuration indication information of the target cell included in the first signaling information, and switch to the target cell according to the random access mode, wherein the first signaling information is used to instruct the UE to switch to the target cell, and the first signaling information is layer 1 or layer 2 signaling.

[0051] Through the embodiments of the present disclosure, a physical layer measurement report sent by a user equipment (UE) is received, and a layer 1 or layer 2 triggered mobile LTM switching is initiated according to the physical layer measurement report, and then first signaling information is sent to the UE to instruct the UE to determine a random access mode in a target cell according to random access resources indicated by configuration indication information of the target cell included in the first signaling information, and switch to the target cell according to the random access mode. The problem that when the UE undergoes LTM switching, the UE loses connection with the original cell, which causes service interruption of the UE, is solved. Then, when the UE undergoes LTM switching, the UE can switch to the target cell according to the random access model corresponding to the first signaling information sent by the network device, avoiding the problem of service interruption of the UE.

[0052] Optionally, the network device indicates whether the UE performs uplink and downlink synchronization with the candidate target cell in advance (before receiving the first signaling information), if yes, for uplink synchronization, the UE selects a TA acquisition manner of the UE according to the network device indication information: network acquisition or UE measurement acquisition, the network acquisition refers to that the UE sends a preamble to the candidate cell, but does not wait to receive RAR information, and the network device calculates the TA and indicates the UE. The UE measurement TA refers to that the UE measures the timing information of the source cell, and obtains the TA of the candidate cell through the time difference with the candidate cell. For downlink synchronization, the UE performs according to the transmission configuration indication (TCI) state indicated by the network device, and after receiving the first signaling, the UE can deactivate the TCI state not indicated in the first signaling information. For the UE performing LTM switching, the UE does not participate in the measurement interval or discontinuous reception (DRX) operation.

[0053] In one example embodiment, the method further comprises: the first signaling information further comprises: a timing advance command (TAC) of the target cell; wherein, in the case that the UE receives the first signaling information comprising the TAC, it is determined that the UE switches to the target cell in a random access (RACH) less mode.

[0054] In order to better understand the above cell switching process, the optional embodiments of the present disclosure provide the following technical solutions to explain and describe the above cell switching process.

[0055] The optional embodiments of the present disclosure provide a cell switching method, a user equipment (UE), a network device and a communication system, to provide a manner of indicating cell switching and determining a random access mode in a target cell.

[0056] In one optional embodiment, the embodiments of the present disclosure provide a cell switching method applied to a user equipment (UE), the method comprising:

[0057] In the LTM switching process, first signaling information sent by a network device where a source cell is located is received, the first signaling information is used to indicate that the UE switches to a target cell; wherein, the first signaling information comprises target cell configuration indication information indicated by the network device; if the UE is a relay UE, switching indication information is sent to a remote UE;

[0058] The UE determines a random access mode and a preamble repetition number, the random access mode at least including a contention based random access (CBRA), a contention free random access (CFRA), or a RACH-less procedure, and initiates a random access procedure to the target cell according to the determined random access mode. The preamble repetition number is configured by a network device and notified to the UE, the network device configures a quality threshold for the preamble repetition number, different repetition numbers correspond to different threshold values, and a higher repetition number corresponds to a lower quality threshold value. When the UE measures a beam quality (L1) that is not higher than a preset threshold value, a corresponding preamble repetition number is selected. For the RACH-less procedure, since a preamble does not need to be sent, there is no preamble repetition number; the CBRA is indicated by a system broadcast to indicate the threshold values of different repetition numbers, the CRFA is explicitly indicated by the network device to indicate the repetition number, the CRFA can fall back to the CBRA, and the preamble repetition number does not change when falling back.

[0059] In another optional embodiment, the disclosure also provides a cell switching method applied to a network device, the method comprising: in an LTM switching process, sending first signaling information to a user equipment (UE), the first signaling information indicating that the UE switches to a target cell, wherein the first signaling information includes configuration indication information of the target cell. The first signaling information can also include a target cell timing advance command (TAC), if the TAC is included, the UE initiates a RACH-less in the target cell, if the network device configures the UE to measure a target cell TA and the UE has measured the target cell TA, the UE initiates a RACH-less procedure in the target cell. The first signaling information can include access resource indication information of the CFRA, such as a preamble index, an SSB index of the target cell, a random access occasion (RO), and the like.

[0060] The LTM switching can exist simultaneously with a conditional handover (CHO) or a conditional primary and secondary cell addition or change (CPAC), and the UE can indicate to the network device to use the LTM or the CHO; when the UE performs the LTM switching, the RRC layer switching command sent by the network device is allowed to be received and indicated.

[0061] The disclosure also provides a cell switching method, a user equipment (UE), a network device, and a communication system.

[0062] In a first aspect, the disclosure provides a cell switching method, the method comprising:

[0063] In the LTM switching process, first signaling information sent by a receiving network device is received, the first signaling information being used to indicate that the UE switches to a target cell; wherein the first signaling information comprises target cell random access resources indicated by the network device; and a random access process is initiated to the target cell according to the random access resources in the first signaling information.

[0064] In combination with some embodiments of the first aspect, in some embodiments, the initiating, according to the first signaling information, of the random access process to the target cell comprises at least one of the following:

[0065] If the UE is a relay UE, switching indication information is sent to a remote UE associated with the relay UE, the UE determining whether it is a relay UE according to network device indication or upper layer information indication, the UE being in an RRC-connected mode, i.e., connected to a source cell. The remote UE determines whether to initiate relay UE reselection according to the received switching indication information, or switches to the target cell according to the indication information.

[0066] If the UE is a relay UE, switching indication information is sent to a remote UE associated with the relay UE.

[0067] The UE performs layer 1 (L1) measurement on an access beam of the target cell, such as SSB / CSI-RS measurement in the beam, and determines a random access mode and a preamble repetition number according to the measurement result and network device indication information.

[0068] In the above embodiment, the random access mode is used to initiate random access to the target cell at a random access occasion (RO) corresponding to a determined SSB.

[0069] In combination with some embodiments of the first aspect, in some embodiments, the determining, according to the measurement result and network device indication information, of the random access mode and the preamble repetition number comprises:

[0070] The first signaling information comprises target cell configuration indication information.

[0071] The measurement result is the RSRP of the beam, it is assumed that the network device has enabled the preamble repetition function, if the measurement result is not lower than a specified threshold value A, CFRA is adopted, and the random access is performed using the network device specified preamble repetition number; if the measurement result is lower than the threshold value A, CBRA is adopted, and the network device indicated preamble repetition number remains unchanged.

[0072] If the network device presets a threshold B, the measurement result is lower than the specified threshold B, CFRA is used, and the preamble repetition number corresponding to the threshold two is selected, or if the measurement result is not lower than any specified threshold B, the lowest preamble repetition number is used according to the network device indication information, or no preamble repetition is used (that is, the preamble is not repeatedly sent before receiving the random access response RAR), or the preamble repetition number corresponding to the current resource, different preamble repetition numbers correspond to different random access resources.

[0073] In combination with some embodiments of the first aspect, in some embodiments, the CFRA resource indication information is included in the first signaling indication information, which can indicate the access occasion RO of the SSB / CSI-RS corresponding to the access beam, that is, the UE sends the preamble in the indicated RO, and if the preamble is repeatedly sent, multiple ROs are needed, and the RO group can be determined first, and then the corresponding RO index in the RO is indicated.

[0074] In combination with some embodiments of the first aspect, in some embodiments, the L1 measurement on the target cell access beam includes: if the L1 measurement result of the access beam resource is less than or equal to a preset threshold value, selecting other beam resources with L1 quality exceeding the preset threshold value, and initiating random access to the target cell in the RO corresponding to the selected beam resource.

[0075] In the second aspect, the embodiments of the present disclosure provide a cell switching method, which includes:

[0076] In the LTM switching process, the network device sends first signaling information, and the first signaling information is used to indicate that the UE switches to a target cell; wherein the first signaling information includes candidate target cell configuration indication information indicated by the network device; and the UE is instructed to initiate a random access process to the target cell.

[0077] In combination with some embodiments of the second aspect, in some embodiments, the first signaling information includes an indication of random access resources and a candidate cell timing advance command, and the random access resources include CFRA resources. The first signaling information includes the timing advance command information, and the UE uses the RACH-less process in the target cell.

[0078] In the eleventh aspect, the embodiments of the present disclosure provide a chip or chip system. The chip or chip system includes:

[0079] The processing circuitry is configured to perform the method described in the above first aspect and the optional implementation of the second aspect.

[0080] It can be understood that the user equipment UE, the network equipment, the communication system, the storage medium, the program product, the computer program, the chip or the chip system are used to execute the method provided by the embodiments of the present disclosure. Therefore, the beneficial effects achieved thereby can refer to the beneficial effects in the corresponding method, which will not be repeated here.

[0081] The embodiments of the present disclosure provide a cell switching method, a user equipment UE, a network equipment and a communication system. In some embodiments, the terms of the cell switching method and the random access method, the cell reselection method, etc. can be replaced with each other, and the terms of the information processing system and the communication system, etc. can be replaced with each other.

[0082] The embodiments of the present disclosure are not exhaustive, but only illustrate some embodiments, and are not specific limitations on the protection scope of the present disclosure. In the case of no contradiction, each step in an embodiment can be implemented as an independent embodiment, and the steps can be combined arbitrarily, for example, the scheme after removing some steps in an embodiment can also be implemented as an independent embodiment, and the order of the steps in an embodiment can be exchanged arbitrarily, in addition, the optional implementation manners in an embodiment can be combined arbitrarily; in addition, the embodiments can be combined arbitrarily, for example, the steps of different embodiments or some or all steps of different embodiments can be combined arbitrarily, an embodiment can be combined with the optional implementation manners of other embodiments arbitrarily.

[0083] In each embodiment of the present disclosure, the terms and / or descriptions between the embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0084] The embodiments of the present disclosure also provide a communication system. As shown in FIG. 4, FIG. 4 is an architecture schematic diagram of a communication system according to an embodiment of the present disclosure. As shown in FIG. 4, the communication system 400 includes a user equipment UE 401 and a network equipment 402.

[0085] In an optional embodiment, the UE 401 includes at least one of a mobile phone, a wearable device, an Internet of Things (IoT) device, a communication-enabled automobile, a smart automobile, a tablet (Pad), a wireless-transmitting computer, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home, and the like, but is not limited thereto.

[0086] When the UE 401 is a relay UE, a remote UE associated with the relay UE is also included, the remote UE is connected to the network device 402 through the relay UE, and the remote UE can also have a link directly to the network device 402, such as a Uu link. The link between the remote UE and the relay UE is a sidelink (SL), and the relay UE provides the remote UE with the function and resources for connecting to the network device 402 and transmits user plane data and control plane signaling between the remote UE and the network device 402.

[0087] In an optional embodiment, the network device 402 can include at least one of an access network device and a core network device.

[0088] In an optional embodiment, the core network device can be one device including one or more network elements, or a plurality of devices or device groups each including all or part of the one or more network elements. The network element can be virtual or physical. The core network includes at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0089] It can be understood that the communication system described in the embodiments of the present disclosure is for more clearly illustrating the technical solutions of the embodiments of the present disclosure, and does not constitute a limitation on the technical solutions proposed by the embodiments of the present disclosure. Those skilled in the art can know that the technical solutions proposed by the embodiments of the present disclosure are also applicable to similar technical problems as the system architecture evolves and new business scenarios appear.

[0090] The embodiments of the present disclosure described below can be applied to the communication system 400 shown in FIG. 4 or part of the subjects, but are not limited thereto. The subjects shown in FIG. 4 are exemplary, and the communication system can include all or part of the subjects in FIG. 4, or other subjects other than FIG. 4. The number and form of each subject is arbitrary, each subject can be real or virtual, the connection relationship between each subject is exemplary, each subject can not be connected or can be connected, the connection can be in any way, can be direct connection or indirect connection, can be wired connection or wireless connection.

[0091] FIG. 5 is an interaction diagram of a cell handover method according to an embodiment of the present disclosure. As shown in FIG. 5, the above method includes:

[0092] In step 501, the network device 402 sends candidate cell configuration information to the user equipment UE 401.

[0093] Wherein, in order for the user equipment to communicate with the network device, it needs to establish a wireless connection with the cell controlled by the network device to camp in the cell controlled by the network device. The cell that establishes a wireless connection with the user equipment is called the service cell of the user equipment.

[0094] In a mobile communication system, due to user equipment mobility and / or cell channel condition changes, the user equipment can switch the service cell, wherein the service cell where the user equipment originally camps is usually called the source cell, and the cell where the user equipment newly camps is usually called the target cell, that is, the user equipment switches from the source cell to the target cell. The process of switching the user equipment from the source cell to the target cell is called the cell handover process.

[0095] Wherein, the UE 401 performs layer 3 (L3) measurement and reports the measurement result according to the configuration information of the network device 402, the network device 402 determines that the UE 401 can perform layer L1 / 2 triggered mobile LTM handover according to the capability and measurement report of the UE 401, and sends the configuration information of the LTM candidate cell for the UE 101, the LTM configuration information is sent through the RRC reconfiguration message, and the LTE configuration information includes one or more of the following: candidate cell identification, beam SSB / CSI-RS configuration, UE-based candidate cell TA measurement indication, TCI configuration, reference signal SSB / CSI-RS threshold configuration, etc.

[0096] The UE 401 receives and stores the LTM candidate cell configuration information.

[0097] At step 502, the UE 401 performs uplink and downlink synchronization with the candidate cell.

[0098] If the LTM candidate cell configuration information received by the UE 401 contains SSB configuration and TCI state information, downlink synchronization with the candidate cell is implemented; if it contains UE-based TA measurement indication or PDCCH indication-based TA acquisition, the TA of the candidate cell is acquired, and uplink synchronization is implemented using the TA.

[0099] It should be noted that step 502 is an optional step. If step 502 exists, the UE performs a RACH-less procedure in the target cell, i.e., it can directly send uplink data in the target cell without the need for a random access procedure. If step 502 does not exist, the UE 401 performs a random access procedure in the target cell.

[0100] At step 503, the UE 401 performs L1 measurement and sends an L1 measurement report to the network device 402.

[0101] The L1 measurement is also known as beam measurement. The user performs L1 measurement on each candidate cell, including the serving cell, according to the measurement reference information in the received LTM configuration information, and reports the measurement results to the serving cell for determining whether to perform handover and to which target cell to perform handover. As long as the UE 401 stores valid candidate cell configuration, L1 measurement and reporting can be performed.

[0102] At step 504, the network device 402 sends first signaling information to the UE 401, the first signaling information being used to trigger the UE to perform handover to a target cell.

[0103] The network device 402 decides to perform LTM cell handover based on the L1 measurement report, and sends the first signaling information through MAC CE.

[0104] The first signaling information includes target cell configuration indication, CRFA access resource, TCI state indication, timing advance command TAC, and the like indicated by the network device.

[0105] The network device 402 can send the first signaling information to the UE 401 in the serving cell (i.e., the source cell), the first signaling information being used to trigger the UE to perform handover to a target cell, and the target cell configuration indication indicated by the network device is carried in the first signaling information, which can be used by the UE 401 to initiate random access to the target cell.

[0106] Step 505, UE 401 performs L1 measurement in the target cell, and selects a random access mode according to the measurement result and network device configuration information.

[0107] If UE 401 has no valid target cell TA information, initiate a random access procedure in the target cell, otherwise initiate a RACH-less procedure in the target cell.

[0108] The L1 measurement is the RSRP of the beam, assuming that the network device has enabled preamble repetition function, if the measurement result is not less than a specified threshold value A, CFRA is adopted, and the random access is performed using the number of preamble repetitions specified by the network device; if the measurement result is less than the threshold value A, CBRA is adopted, and the number of preamble repetitions indicated by the network device remains unchanged;

[0109] If the network device presets a threshold B, and the measurement result is less than the specified threshold value B, CFRA is adopted, and the number of preamble repetitions corresponding to the threshold two is selected, or if the measurement result is not less than any specified threshold value B, the lowest number of preamble repetitions is adopted according to the network device indication information, or no preamble repetition is used (i.e. the preamble is not sent repeatedly before receiving the random access response RAR), or the number of preamble repetitions corresponding to the current resource, different preamble repetition numbers correspond to different random access resources.

[0110] In an optional embodiment, the CFRA resource indication information is included in the first signaling indication information, which can indicate the access occasion RO of the SSB / CSI-RS corresponding to the access beam, i.e. UE sends preamble in the indicated RO, if the preamble is sent repeatedly, multiple ROs are needed, the RO group can be determined first, and then the corresponding RO index in the RO is indicated;

[0111] In an optional embodiment, the L1 measurement on the target cell access beam includes:

[0112] If the L1 measurement result of the access beam resource is less than or equal to a preset threshold value C, select other beam resources whose L1 quality exceeds the preset threshold value C, and initiate random access to the target cell in the RO corresponding to the selected beam resource.

[0113] If UE 401 determines that it is a relay UE, it sends a handover information indication to the associated remote UE.

[0114] Step 506, UE 401 accesses the target cell according to the selected random access mode.

[0115] Step 507, UE completes the LTM procedure.

[0116] If the UE 401 performs the RA procedure, the terminal considers that the LTM cell switching execution has been successfully completed when the random access procedure is successfully completed. For the LTM without rach, the UE 401 considers that the LTM cell switching execution has been successfully completed when the UE 401 determines that the network device 402 has successfully received its first uplink data.

[0117] In an optional embodiment, as shown in FIG. 6, step 505 further includes the following:

[0118] Step 601, the UE receives the first signaling information;

[0119] Step 602, the UE 401 determines itself as a relay UE, and then one of steps 603 or 604 is executed; the UE 401 determines itself as a relay UE according to the indication information of the network device 402 or the upper layer indication information.

[0120] Step 603, the UE 401 sends switching indication information to the remote UE.

[0121] The UE 401 sends the switching indication information to the remote UE through the sidelink, and further, the UE 401 sends the target cell configuration information to the remote UE, the remote UE continuously connects the sidelink with the UE 101 and accesses the target cell together with the UE 401; the remote UE can also disconnect the sidelink with the UE 101 and select a new relay UE to access the network device 402.

[0122] Step 604, the network device 402 sends switching indication information to the remote UE.

[0123] If there is a Uu direct link between the remote UE and the network device 402, the network device 402 can send the switching indication information of the UE 401, the remote UE can select a new relay UE, or access the target cell together with the UE 401, or just disconnect the sidelink with the UE 401.

[0124] In an optional embodiment, as shown in FIG. 7, step 506 includes mode one to mode three.

[0125] Specifically, step 701, after the UE 401 determines the random access mode, one of steps 702 to 704 can be executed.

[0126] Mode one (step 702), it is determined to access in the RACH-less mode, the UE 401 sends uplink data in the target cell according to the scheduling resource configured by the network device 402, and if it is determined that the network device 402 has successfully received the uplink data, the LTM switching procedure is ended;

[0127] In the second mode (step 703), when it is determined that the CFRA mode is used, the UE 401 further determines the access resource and the preamble repetition number of the target cell, initiates the CFRA procedure in the target cell, and when the UE 401 receives the RAR message sent by the network device 402, the LTM switching procedure ends.

[0128] In the third mode (step 704), when it is determined that the CBRA mode is used, the UE 101 selects the access occasion and the preamble, and the preamble repetition number, initiates the random access in the target cell, performs the L1 measurement on the access beam, and if the measurement result is lower than the preset threshold, the UE 401 selects other beams for access until the UE 401 receives the RAR message sent by the network device, and then determines that the LTM procedure ends.

[0129] In an optional embodiment, the names of information and the like are not limited to the names described in the embodiments, and the terms such as “information”, “message”, “signal”, “signaling”, “report”, “configuration”, “indication”, “instruction”, “command”, “channel”, “parameter”, “field”, “symbol”, “code point”, “bit”, “data”, “program”, “chip”, and the like can be replaced with each other.

[0130] In some embodiments, the terms such as “certain”, “preseted”, “preset”, “set”, “indicated”, “certain”, “arbitrary”, “first”, and the like can be replaced with each other, and “certain A”, “preset A”, “preset A”, “set A”, “indicated A”, “certain A”, “arbitrary A”, “first A” can be interpreted as A specified in advance in a protocol or the like, A obtained by setting, configuration, or indication, or A that is certain, arbitrary, or first, but are not limited thereto.

[0131] In some embodiments, the determination or judgment can be performed by a value (0 or 1) represented by 1 bit, or by a true or false value (Boolean value) represented by true or false, or by comparison of a numerical value (for example, comparison with a predetermined value), but is not limited thereto.

[0132] In some embodiments, "not expecting to receive" can be interpreted as not receiving on the time domain resource and / or the frequency domain resource, or as not performing subsequent processing on the data, etc. after receiving the data; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the receiver to respond to the content of the sending.

[0133] The cell switching method related to the embodiments of the present disclosure can include the foregoing steps and at least one of the embodiments.

[0134] FIG. 8 is another flowchart of a cell switching method according to an embodiment of the present disclosure. As shown in FIG. 8, the above method can be applied to a user equipment (UE) 401, and the above method includes:

[0135] Step 801, receiving first signaling information sent by a network device;

[0136] The first signaling information is used to trigger the UE to switch to a target cell; wherein the first signaling information includes candidate cell configuration information indicated by the network device.

[0137] Step 802, determining a random access mode, if there is no valid target cell TA, proceeding to step 803, otherwise, proceeding to step 806.

[0138] The valid target cell TA includes: a TAC in the first signaling information, or a TA measured by the UE.

[0139] Step 803, measuring the L1 beam quality of the target cell, if the L1 measurement result is higher than a preset threshold A of the network device 402, proceeding to step 804, otherwise, proceeding to step 805.

[0140] The threshold A is used for fallback CBRA, that is, when the beam quality of the target cell is lower than the threshold A, fallback to CBRA is selected by CFRA.

[0141] Step 804, performing CFRA according to the indication information of the network device 402.

[0142] The UE 401 initiates CFRA according to the resource and preamble repetition number indicated by the network device 402.

[0143] Step 805, selecting a resource for CBRA.

[0144] The UE 401 falls back to CBRA, selects a new beam to access the target cell, and the preamble repetition number remains unchanged according to the indication of the network device 402.

[0145] Step 806, connecting to the target cell using RACH-less.

[0146] The UE 101 directly transmits uplink data on a PUSCH according to the received scheduling resource in the target cell.

[0147] At step 807, the LTM ends.

[0148] The LTM process can be performed multiple times in different target cells by using the candidate cell configuration information provided by the network device 402.

[0149] The cell switching method related to the embodiments of the present disclosure can include the foregoing steps and at least one of the embodiments.

[0150] FIG. 9 is another flowchart of a cell switching method according to an embodiment of the present disclosure. As shown in FIG. 9, the method is applied to a network device, and the method includes the following steps:

[0151] At step 901, first signaling information is sent to a user equipment (UE).

[0152] The first signaling information is used to trigger the UE to switch to a target cell by using LTM. The first signaling information includes configuration information indication of the target cell.

[0153] Optionally, the first signaling information includes TAC, target cell random access resource, such as access preamble index, random access occasion (RO), and SSB index.

[0154] Optionally, the network device sends LTM switching indication information to a remote UE.

[0155] At step 902, a preamble or uplink data sent by the UE is received.

[0156] If the UE uses a RACH-less mode, the network device receives uplink data sent by the UE; if the UE uses a CBRA / CRFA mode, the network device receives a preamble sent by the UE.

[0157] From the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software and the necessary general hardware platform, of course, it can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present disclosure can be embodied in the form of a software product, which is stored in a readable storage medium (such as ROM / RAM, magnetic disk, or optical disk), and includes a number of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the methods of various embodiments of the present disclosure.

[0158] The cell switching apparatus is also provided in the embodiment, which is configured to implement the above-mentioned embodiments and preferred embodiments, and details have been described above. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0159] FIG. 10 is a structural block diagram of a cell switching apparatus applied to a user equipment (UE) according to an embodiment of the present disclosure. As shown in FIG. 10, the cell switching apparatus includes:

[0160] A first sending module 1002 is configured to send a physical layer measurement report to a network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobile LTM switching;

[0161] A first receiving module 1004 is configured to receive first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, and the first signaling information includes configuration indication information of the target cell; and the first signaling information is layer 1 or layer 2 signaling.

[0162] A switching module 1006 is configured to determine a random access mode in the target cell, and switch to the target cell according to the random access mode.

[0163] According to the present disclosure, the physical layer measurement report is sent to the network device, so that the network device initiates the layer 1 or layer 2 triggered mobile LTM switching, and then the first signaling information sent by the network device in the source cell is received, and then the configuration indication information of the target cell indicated by the network device in the first signaling information is determined to determine the random access mode in the target cell, and the target cell is switched according to the random access mode. The problem of service interruption of the UE caused by the loss of connection with the original cell when the UE occurs LTM switching in the related art is solved. Then, when the UE occurs LTM switching, the target cell can be switched according to the random access model corresponding to the first signaling information sent by the network device, and the problem of service interruption of the UE is avoided.

[0164] Optionally, the network device indicates whether the UE performs uplink and downlink synchronization with the candidate target cell in advance (before receiving the first signaling information), if yes, for uplink synchronization, the UE selects a TA acquisition manner of the UE acquiring TA of the candidate cell according to the network device indication information: network acquisition or UE measurement acquisition, the network acquisition refers to that the UE sends a preamble to the candidate cell, but does not wait to receive RAR information, and the network device calculates TA and indicates the UE. The UE measurement TA refers to that the UE measures timing information of the source cell, and obtains TA of the candidate cell through a time difference with the candidate cell. For downlink synchronization, the UE performs according to the transmission configuration indication (TCI) state indicated by the network device, and after receiving the first signaling, the UE can deactivate the TCI state not indicated in the first signaling information. For the UE performing LTM switching, the UE does not participate in the measurement interval or discontinuous reception (DRX) operation.

[0165] In one example embodiment, the apparatus further comprises a determining module configured to determine that the mobile LTM switching is successful in a case that the random access mode of the target cell is successfully ended or uplink data transmission is successful.

[0166] In one example embodiment, the determining module is further configured to measure timing advance information of the target cell and perform uplink and downlink synchronization with the target cell before the UE receives the first signaling information sent by the network device.

[0167] In one example embodiment, the first receiving module is further configured to, in a case that the UE is a relay UE, send switching indication information to a remote UE according to the first signaling information after receiving the first signaling information sent by the network device of the source cell, so as to instruct the remote UE to switch to the target cell or determine whether to initiate relay UE reselection.

[0168] In actual operation, in order to increase the coverage range of the random access preamble, the relay UE can repeatedly send the preamble multiple times when initiating the random access process in the target cell, and if the target cell resource quality indicated in the LTM switching command decreases, the random access mode and the preamble repetition number need to be adjusted. In one example embodiment, the determining module is configured to determine the random access mode and the preamble repetition number, wherein the random access mode comprises at least one of the following: a conflict-based random access (CBRA), a conflict-free random access (CFRA), and a random access-less (RACH-less); the preamble repetition number is notified to the UE by the network device; and the UE switches to the target cell according to the random access mode.

[0169] In an example embodiment, the quality threshold corresponding to the preamble repetition number is configured by the network device, and different quality thresholds correspond to different preamble repetition numbers; when the beam quality measured by the UE is less than or equal to a preset threshold, the preamble repetition number corresponding to the quality threshold of the beam quality is selected.

[0170] In an example embodiment, the random access mode is determined according to at least one of the following: timing advance information, and channel quality of the target cell; if the timing advance information is included in the first signaling information, or the UE has obtained the timing advance information before the mobile LTM switching, the RACH-less mode is adopted; if the UE has not obtained the timing advance information, the CFRA mode is adopted, and when the CFRA mode is selected, if the channel quality of the target cell is lower than a specified threshold, the CBRA mode is adopted.

[0171] In an example embodiment, for the RACH-less mode, the preamble repetition number is not required; the random access CBRA mode is indicated by system broadcast to correspond to different threshold values of preamble repetition numbers; for the collision-free random access CFRA mode, the preamble repetition number corresponding to the collision-free random access CFRA mode is indicated by the network device, the collision-free random access CFRA mode is allowed to fall back to the collision-based random access CBRA mode, and the preamble repetition number when falling back remains unchanged.

[0172] In an example embodiment, the first signaling information further includes a timing advance command TAC of the target cell; wherein the determination module is further configured to determine that the UE adopts the RACH-less mode to switch to the target cell when the UE receives the first signaling information including the TAC.

[0173] In an example embodiment, the switching module is further configured to adopt the RACH-less mode to switch to the target cell when the network device configures the UE to measure the target cell TA, and the UE has measured the target cell TA.

[0174] In an example embodiment, when the LTM switching, the conditional handover CHO and the conditional primary and secondary cell addition or change CPAC coexist, the network device is indicated to perform the LTM switching or the CHO; when the UE performs the LTM switching, the RRC layer switching command sent by the network device is allowed to be received and indicated.

[0175] FIG. 11 is a structural block diagram of a cell switching device applied to a network device according to an embodiment of the present disclosure. As shown in FIG. 11, the cell switching device includes:

[0176] The second receiving module 1102 is configured to receive a physical layer measurement report sent by a user equipment (UE), and initiate a layer 1 or layer 2 triggered mobile LTM switching according to the physical layer measurement report.

[0177] The second sending module 1104 is configured to send first signaling information to the UE, to instruct the UE to determine a random access mode in a target cell according to random access resources indicated by configuration indication information of the target cell included in the first signaling information, and switch to the target cell according to the random access mode, wherein the first signaling information is used to instruct the UE to switch to the target cell, and the first signaling information is layer 1 or layer 2 signaling.

[0178] According to the present disclosure, a physical layer measurement report sent by a user equipment (UE) is received, and a layer 1 or layer 2 triggered mobile LTM switching is initiated according to the physical layer measurement report. Then, first signaling information is sent to the UE, to instruct the UE to determine a random access mode in a target cell according to random access resources indicated by configuration indication information of the target cell included in the first signaling information, and switch to the target cell according to the random access mode. The problem that when the UE undergoes LTM switching, the UE loses connection with the original cell, causing service interruption of the UE, is solved. Then, when the UE undergoes LTM switching, the UE can switch to the target cell according to a random access model corresponding to the first signaling information sent by the network device, avoiding the problem of service interruption of the UE.

[0179] Optionally, the network device instructs the UE whether to perform uplink and downlink synchronization with the candidate target cell in advance (before receiving the first signaling information). If yes, for uplink synchronization, the UE selects a TA acquisition mode of the UE according to network device indication information: network acquisition or UE measurement acquisition. Network acquisition refers to that the UE sends a preamble to the candidate cell, but does not wait to receive RAR information, and the TA is calculated by the candidate network device and indicated to the UE. UE measurement TA refers to that the UE measures the timing information of the source cell, and obtains the TA of the candidate cell through the time difference with the candidate cell. For downlink synchronization, the UE performs according to the transmission configuration indication (TCI) state indicated by the network device. After receiving the first signaling, the UE can deactivate the TCI state not indicated in the first signaling information. For the UE undergoing LTM switching, the UE does not participate in measurement interval or discontinuous reception (DRX) operation.

[0180] The first signaling information further comprises: a timing advance command (TAC) of the target cell; and wherein, in a case that the UE receives the first signaling information comprising the TAC, the UE is determined to switch to the target cell in a RACH-less mode.

[0181] It should be understood that the division of each unit or module in the above apparatus is only a logical function division, and all or part of them can be integrated into one physical entity or physically separated. In addition, the units or modules in the apparatus can be implemented in the form of processor invoking software: for example, the apparatus includes a processor, a memory connected with the processor, and the memory stores instructions. The processor invokes the instructions stored in the memory to implement any of the above methods or realize the functions of each unit or module of the above apparatus, wherein the processor is a general processor such as a central processing unit (CPU) or a microprocessor, and the memory is an internal memory of the apparatus or an external memory of the apparatus. Alternatively, the units or modules in the apparatus can be implemented in the form of hardware circuit, and the functions of part or all of the units or modules can be realized by the design of hardware circuit. The above hardware circuit can be understood as one or more processors; for example, in one implementation, the above hardware circuit is an application-specific integrated circuit (ASIC), and the functions of part or all of the units or modules are realized by the design of logical relationship of elements in the circuit; for another example, in another implementation, the above hardware circuit is realized by a programmable logic device (PLD), and taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by a configuration file, so as to realize the functions of part or all of the units or modules. All units or modules of the above apparatus can be implemented in the form of processor calling software, or all units or modules can be implemented in the form of hardware circuit, or part of the units or modules are implemented in the form of processor calling software, and the remaining part is implemented in the form of hardware circuit.

[0182] In the embodiments of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), a digital signal processor (DSP), or the like. In another implementation, the processor can implement certain functions through a logical relationship of a hardware circuit, and the logical relationship of the hardware circuit is fixed or can be reconfigured. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In the reconfigurable hardware circuit, the processor loads a configuration document to implement the configuration of the hardware circuit. It can be understood that the processor loads instructions to implement the functions of part or all of the units or modules described above. In addition, the hardware circuit can also be designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), or the like.

[0183] The specific examples in this embodiment can refer to the examples described in the above embodiments and exemplary implementations, which will not be repeated here.

[0184] The embodiments of the present disclosure also provide a storage medium including a stored program, wherein the program performs any of the above methods when running.

[0185] Optionally, in this embodiment, the storage medium can be configured to store program code for performing the following steps:

[0186] S1, the UE sends a physical layer measurement report to the network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobile LTM handover.

[0187] S2, the UE receives first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, and the first signaling information includes configuration indication information of the target cell; the first signaling information is layer 1 or layer 2 signaling.

[0188] S3, determining a random access mode in the target cell, and switching to the target cell according to the random access mode.

[0189] Embodiments of the present disclosure further provide an electronic device, comprising a memory and a processor, the memory storing a computer program, and the processor being configured to execute the computer program to perform the steps in any of the above method embodiments.

[0190] Optionally, in the embodiment, the processor can be configured to perform the following steps by the computer program:

[0191] S1, the UE sends a physical layer measurement report to a network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobile LTM handover.

[0192] S2, the UE receives first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, and the first signaling information comprises configuration indication information of the target cell; the first signaling information is layer 1 or layer 2 signaling.

[0193] S3, determining a random access mode in the target cell, and switching to the target cell according to the random access mode.

[0194] In one exemplary embodiment, the electronic device can further comprise a transmission device connected to the processor and an input / output device connected to the processor.

[0195] Optionally, in the embodiment, the electronic device can be further configured to perform the above steps S1, S2 and S3 by the computer program.

[0196] The specific examples in the embodiment can refer to the examples described in the above embodiments and exemplary implementation manners, which will not be described herein again.

[0197] Embodiments of the present disclosure further provide a computer program product, which comprises a computer program, and the computer program is executed by a processor to implement the steps in any of the above method embodiments.

[0198] Embodiments of the present disclosure further provide another computer program product, which comprises a non-volatile computer readable storage medium, and the non-volatile computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps in any of the above method embodiments.

[0199] Embodiments of the present disclosure further provide a computer program, comprising computer instructions stored in a computer readable storage medium; a processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to enable the computer device to perform the steps in any of the method embodiments described above.

[0200] Obviously, those skilled in the art should understand that the modules or steps of the present disclosure described above can be realized by universal computing devices, which can be centralized on a single computing device or distributed on a network composed of multiple computing devices, and can be realized by program codes executable by the computing devices, so that they can be stored in storage devices and executed by the computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be made into individual integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module. Thus, the present disclosure is not limited to any specific combination of hardware and software.

[0201] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A cell handover method, applied to a user equipment (UE), comprising: The UE sends a physical layer measurement report to a network device, so that the network device determines to initiate a layer 1 or layer 2 triggered mobility LTM handover; The UE receives first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, the first signaling information includes configuration indication information of the target cell; and the first signaling information is layer 1 or layer 2 signaling; Determine a random access mode in the target cell, and switch to the target cell according to the random access mode.

2. The cell switching method according to claim 1, wherein: The method further comprises: In a case where the random access mode of the target cell is successfully terminated or uplink data is successfully sent, the UE determines that the mobile LTM handover is successful.

3. The cell switching method according to claim 1, wherein: Before the UE receives the first signaling information sent by the network device, the method further includes: The UE measures the timing advance information of the target cell and achieves uplink and downlink synchronization with the target cell.

4. The cell switching method according to claim 1, wherein: The method further comprises: In the case where the UE is a relay UE, after receiving the first signaling information sent by the network device where the source cell is located, a switching indication information is sent to the remote UE according to the first signaling information to instruct the remote UE to switch to the target cell or determine whether to initiate relay UE reselection.

5. The cell switching method according to claim 1, wherein: The method further comprises: Determining a random access mode and a number of preamble repetition transmissions, wherein the random access mode includes at least one of the following: contention-based random access (CBRA), contention-free random access (CFRA), and random access-less (RACH-less); and notifying the UE of the number of preamble repetition transmissions by the network device; Switching to the target cell according to the random access mode.

6. The cell switching method according to claim 5, wherein: The method further comprises: The quality threshold value corresponding to the number of repeated transmissions of the preamble is configured by the network device, and different numbers of repeated transmissions of the preamble correspond to different quality threshold values; when the beam quality measured by the UE is less than or equal to the preset threshold value, the number of repeated transmissions of the preamble corresponding to the quality threshold value of the beam quality is selected.

7. The cell handover method according to any one of claims 1 to 6, wherein: The method further comprises: The random access mode is determined according to at least one of the following: timing advance information, channel quality of the target cell; wherein, if the first signaling information contains the timing advance information, or the UE has obtained the timing advance information before the mobile LTM switching, the RACH-less mode is adopted; if the UE does not obtain the timing advance information, the CFRA mode is adopted. When the CFRA mode is selected, if the channel quality of the target cell is lower than a specified threshold, the CBRA mode is adopted.

8. The cell switching method according to claim 7, wherein: The method further comprises: For the RACH-less mode, the number of preamble repetitions is not required; The random access CBRA mode is broadcast by the system to indicate the threshold values ​​corresponding to different preamble repetition transmission times; For the conflict-free random access CFRA mode, the network device indicates the number of preamble repetitions corresponding to the conflict-free random access CFRA mode, allowing the conflict-free random access CFRA mode to fall back to the conflict-based random access CBRA mode, and the number of preamble repetitions remains unchanged when falling back.

9. The cell switching method according to claim 1, wherein: The method further comprises: The first signaling information further includes: a timing advance command TAC of the target cell; wherein, when the UE receives the first signaling information including the TAC, it is determined that the UE adopts a RACH-less mode to switch to the target cell.

10. The cell handover method according to claim 1, wherein: The method further comprises: When the network device configures the UE to measure the target cell TA and the UE has measured the target cell TA, the RACH-less mode is adopted to switch to the target cell.

11. The cell switching method according to claim 1, wherein: The method further includes: instructing the network device to perform the LTM handover or the CHO when the LTM handover, the conditional handover CHO, and the conditional primary and secondary cell addition or change CPAC exist simultaneously; When the UE performs the LTM switching, it is allowed to receive and instruct the RRC layer switching command sent by the network device.

12. A cell handover method, applied to a network device, comprising: receiving a physical layer measurement report sent by a user equipment UE, and initiating a layer 1 or layer 2 triggered mobility LTM handover according to the physical layer measurement report; Sending first signaling information to the UE to instruct the UE to determine the random access mode in the target cell according to the random access resources indicated by the configuration indication information of the target cell included in the first signaling information, and switching to the target cell according to the random access mode, wherein the first signaling information is used to instruct the UE to switch to the target cell, and the first signaling information is layer 1 or layer 2 signaling.

13. The cell handover method according to claim 12, wherein: The method further comprises: The first signaling information further includes: a timing advance command TAC of the target cell; wherein, when the UE receives the first signaling information including the TAC, it is determined that the UE adopts a random access-free RACH-less mode to switch to the target cell.

14. A cell switching device, applied to a user equipment (UE), comprising: A first sending module is configured to send a physical layer measurement report to a network device so that the network device determines to initiate a layer 1 or layer 2 triggered mobility LTM handover; a first receiving module, configured to receive first signaling information sent by the network device, wherein the first signaling information is used to instruct the UE to switch to a target cell, the first signaling information including configuration indication information of the target cell; and the first signaling information is layer 1 or layer 2 signaling; The switching module is configured to determine a random access mode in the target cell and switch to the target cell according to the random access mode.

15. A cell switching device, applied to a network device, comprising: A second receiving module is configured to receive a physical layer measurement report sent by a user equipment UE, and initiate a layer 1 or layer 2 triggered mobile LTM handover according to the physical layer measurement report; The second sending module is configured to send first signaling information to the UE to instruct the UE to determine the random access mode in the target cell according to the random access resources indicated by the configuration indication information of the target cell included in the first signaling information, and switch to the target cell according to the random access mode, wherein the first signaling information is used to instruct the UE to switch to the target cell, and the first signaling information is layer 1 or layer 2 signaling.

16. A computer-readable storage medium storing a computer program, wherein: The computer program is configured to execute the method according to any one of claims 1 to 11 or any one of claims 12 to 13 when run.

17. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the method according to any one of claims 1 to 11 or the method according to any one of claims 12 to 13 through the computer program.

18. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 11, or the steps of the method according to any one of claims 12 to 13.

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