WO2024065674A1 - 通信方法、装置、设备、存储介质、芯片、产品及程序 - Google Patents

通信方法、装置、设备、存储介质、芯片、产品及程序 Download PDF

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Publication number
WO2024065674A1
WO2024065674A1 PCT/CN2022/123266 CN2022123266W WO2024065674A1 WO 2024065674 A1 WO2024065674 A1 WO 2024065674A1 CN 2022123266 W CN2022123266 W CN 2022123266W WO 2024065674 A1 WO2024065674 A1 WO 2024065674A1
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Prior art keywords
terminal device
target cell
cell
information
target
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PCT/CN2022/123266
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English (en)
French (fr)
Inventor
尤心
林雪
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Oppo广东移动通信有限公司
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Priority to PCT/CN2022/123266 priority Critical patent/WO2024065674A1/zh
Publication of WO2024065674A1 publication Critical patent/WO2024065674A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the embodiments of the present application relate to the field of mobile communication technology, and specifically to a communication method, apparatus, device, storage medium, chip, product and program.
  • the terminal device can switch from the source cell to the target cell through the switching process. However, in the event that the terminal device fails to switch, the terminal device may not be able to establish a connection with the target cell, resulting in the terminal being unable to communicate with the target cell, thereby reducing the reliability of information transmission.
  • Embodiments of the present application provide a communication method, apparatus, device, storage medium, chip, product, and program.
  • an embodiment of the present application provides a communication method, the method comprising:
  • the terminal device determines a target cell or first information; wherein the first information is used to indicate the target cell;
  • the terminal device accesses the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a switch to the first candidate cell.
  • an embodiment of the present application provides a communication method, the method comprising:
  • the source network device sends an identifier or first information of a target cell to the terminal device; wherein the first information is used to indicate the target cell;
  • the identifier of the target cell or the first information is used by the terminal device to access the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • an embodiment of the present application provides a communication device, including:
  • a determination unit configured to: determine a target cell or first information; wherein the first information is used to indicate the target cell;
  • a communication unit is used to: access the target cell through a random access process, or trigger a connection re-establishment process, or perform a handover to a first candidate cell determined by the terminal device.
  • an embodiment of the present application provides a communication device, including:
  • a communication unit configured to: send an identifier of a target cell or first information to a terminal device; wherein the first information is used to indicate the target cell;
  • the identifier of the target cell or the first information is used by the terminal device to access the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • an embodiment of the present application provides a communication device, including: a processor and a memory,
  • the memory stores a computer program executable on the processor.
  • an embodiment of the present application provides a computer storage medium, wherein the computer storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method described in the first aspect or the second aspect.
  • an embodiment of the present application provides a chip, comprising: a processor, configured to call and run a computer program from a memory to implement the method described in the first aspect or the second aspect.
  • an embodiment of the present application provides a computer program product, the computer program product comprising a computer storage medium, the computer storage medium storing a computer program, the computer program comprising instructions executable by at least one processor, and the method described in the first aspect or the second aspect is implemented when the instructions are executed by the at least one processor.
  • an embodiment of the present application provides a computer program, which enables a computer to execute the method described in the first aspect or the second aspect.
  • a terminal device determines a target cell or first information; wherein the first information is used to indicate a target cell; the terminal device accesses the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a handover to the first candidate cell.
  • the terminal device can access the target cell through a random access process, or can access the target cell through a connection re-establishment process, or can access the first candidate cell, so that the terminal device can communicate in the target cell or the first candidate cell, thereby improving the reliability of information transmission.
  • FIG1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • FIG2 is a schematic diagram of a switching process provided in an embodiment of the present application.
  • FIG3 is a flow chart of a communication method provided in an embodiment of the present application.
  • FIG4 is a flow chart of another communication method provided in an embodiment of the present application.
  • FIG5 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • FIG7 is a schematic structural diagram of a communication device provided in an embodiment of the present application.
  • FIG8 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • Fig. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • a communication system 100 may include a terminal device 110 and a network device 120.
  • the network device 120 may communicate with the terminal device 110 via an air interface.
  • the terminal device 110 and the network device 120 support multi-service transmission.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced long term evolution
  • NR New Radio
  • NR-A LTE-based access to unlicensed spectrum
  • LTE-U unlicensed spectrum
  • NR-A NR-based access to unlicensed spectrum
  • NR-U Universal Mobile Telecommunication System
  • UMTS Universal Mobile Telecommunication System
  • WLAN Wireless Local Area Networks
  • WiFi Wireless Fidelity
  • WiFi LTE Time Division Duplex
  • Universal Mobile Telecommunication System UMTS
  • Internet of Things NB-IoT system
  • eMTC enhanced Machine-Type Communications
  • future communication systems such as 6G and 7G communication systems
  • the network device 120 in the embodiment of the present application may include an access network device 121 and/or a core network device 122.
  • the access network device may provide communication coverage for a specific geographical area and may communicate with a terminal device 110 (eg, UE) located in the coverage area.
  • the terminal in this application is a device with wireless communication function, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).
  • the terminal device in this application can be called user equipment (User Equipment, UE), mobile station (Mobile Station, MS), mobile terminal (Mobile Terminal, MT), user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device.
  • the terminal device may include one of the following or a combination of at least two: Internet of Things device, satellite terminal, Wireless Local Loop (Wireless Local Loop, WLL) station, Personal Digital Assistant (Personal Digital Assistant (PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, servers, mobile phones, tablet computers, computers with wireless transceiver functions, PDAs, desktop computers, personal digital assistants, portable media players, smart speakers, navigation devices, smart watches, smart glasses, smart necklaces and other wearable devices, pedometers, digital TVs, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminals in industrial control , wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home, as well as vehicles in Internet of Vehicles system, on-board equipment, on-board modules, wireless modems, handheld devices, customer premises equipment (CPE), smart home appliances, etc.
  • CPE customer premises equipment
  • the terminal device 110 may be any terminal device, including but not limited to a terminal device connected to the network device 120 or other terminal devices by wire or wirelessly.
  • the terminal device 110 can be used for device to device (Device to Device, D2D) communication.
  • D2D Device to Device
  • the access network equipment 121 may include one of the following or a combination of at least two: Evolutional Node B (eNB or eNodeB) in Long Term Evolution (LTE) system, Next Generation Radio Access Network (NG RAN) equipment, base station (gNB) in NR system, small cell, micro cell, wireless controller in Cloud Radio Access Network (CRAN), access point of Wireless-Fidelity (Wi-Fi), transmission reception point (TRP), relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network equipment in future evolved Public Land Mobile Network (PLMN), etc.
  • eNB or eNodeB Evolutional Node B
  • NG RAN Next Generation Radio Access Network
  • gNB base station
  • CRAN Cloud Radio Access Network
  • Wi-Fi Wireless-Fidelity
  • TRP transmission reception point
  • PLMN Public Land Mobile Network
  • the core network device 122 may be a 5G core network (5G Core, 5GC) device, and the core network device 122 may include one of the following or a combination of at least two: Access and Mobility Management Function (Access and Mobility Management Function, AMF), Authentication Server Function (Authentication Server Function, AUSF), User Plane Function (User Plane Function, UPF), Session Management Function (Session Management Function, SMF), Location Management Function (Location Management Function, LMF), Policy Control Function (Policy Control Function, PCF).
  • Access and Mobility Management Function Access and Mobility Management Function
  • AMF Access and Mobility Management Function
  • AUSF Authentication Server Function
  • UPF User Plane Function
  • Session Management Function Session Management Function
  • SMF Session Management Function
  • LMF Location Management Function
  • Policy Control Function Policy Control Function
  • the core network device may also be an Evolved Packet Core (EPC) device of an LTE network, for example, Session Management Function + Core Packet Gateway (SMF+PGW-C) device of a core network.
  • EPC Evolved Packet Core
  • SMF+PGW-C Session Management Function + Core Packet Gateway
  • SMF+PGW-C can simultaneously implement the functions that can be implemented by SMF and PGW-C.
  • the core network device 122 may also be called other names, or a new network entity may be formed by dividing the functions of the core network, which is not limited in the embodiments of the present application.
  • the various functional units in the communication system 100 can also establish connections and achieve communication through the next generation network (NG) interface.
  • NG next generation network
  • the terminal device establishes an air interface connection with the access network device through the NR interface for transmitting user plane data and control plane signaling; the terminal device can establish a control plane signaling connection with the AMF through the NG interface 1 (N1 for short); the access network device, such as the next generation wireless access base station (gNB), can establish a user plane data connection with the UPF through the NG interface 3 (N3 for short); the access network device can establish a control plane signaling connection with the AMF through the NG interface 2 (N2 for short); the UPF can establish a control plane signaling connection with the SMF through the NG interface 4 (N4 for short); the UPF can exchange user plane data with the data network through the NG interface 6 (N6 for short); the AMF can establish a control plane signaling connection with the SMF through the NG interface 11 (N11 for short); the SMF can establish a control plane signaling connection with the PCF through the NG interface 7 (N7 for short).
  • the access network device such as the next generation wireless access base station
  • Figure 1 exemplarily shows a base station, a core network device and two terminal devices.
  • the wireless communication system 100 may include multiple base station devices and each base station may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.
  • FIG. 1 is only an example of the system to which the present application is applicable.
  • the method shown in the embodiment of the present application can also be applied to other systems.
  • system and “network” are often used interchangeably in this article.
  • the term “and/or” in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this article generally indicates that the objects associated with each other are in an "or” relationship.
  • the "indication" mentioned in the embodiment of the present application can be a direct indication, an indirect indication, or an indication of an association relationship.
  • a indicates B which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, B can be obtained through C; it can also mean that A and B have an association relationship.
  • the "correspondence” mentioned in the embodiment of the present application can mean that there is a direct or indirect correspondence relationship between the two, or it can mean that there is an association relationship between the two, or it can mean that the relationship between indicating and being indicated, configuring and being configured, etc.
  • predefined can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), and the present application does not limit its specific implementation method.
  • predefined may refer to the definition in the protocol.
  • the "protocol” may refer to a standard protocol in the field of communications, such as LTE protocols, NR protocols, and related protocols used in future communication systems, and the present application does not limit this.
  • the system When a terminal device that is using network services moves from one cell to another, or due to wireless transmission service load adjustment, activation operation maintenance, equipment failure, etc., in order to ensure communication continuity and service quality, the system must transfer the communication link between the terminal device and the source cell to the new target cell, that is, perform a switching process.
  • FIG. 2 is a schematic diagram of a switching process provided by an embodiment of the present application. As shown in FIG. 2 , taking the Xn interface switching process as an example, the entire switching process can be divided into the following three stages:
  • Handover preparation including measurement control and reporting, handover request and confirmation.
  • the handover confirmation message contains the handover command generated by the target cell.
  • the source cell is not allowed to make any modification to the handover command generated by the target cell and directly forwards the handover command to the terminal device.
  • the terminal device After receiving the handover command, the terminal device immediately executes the handover process, that is, the terminal device disconnects from the source cell and connects to the target cell (such as performing random access, sending a Radio Resource Control (RRC) handover completion message to the target base station, etc.); sequence number (SN) state transfer and data forwarding.
  • RRC Radio Resource Control
  • SN sequence number
  • the target base station performs path switching (Path Switch) with the Access and Mobility Management Function (AMF) and the User Port Function (UPF) to release the terminal device context of the source base station.
  • Path Switch path switching
  • AMF Access and Mobility Management Function
  • UPF User Port Function
  • the switching process may include steps 1 to 12 below.
  • step 1 the terminal device exchanges user data with the source base station, and the source base station exchanges user data with UPF(s). Before step 1, there may also be step 0: providing mobile control information through AMF.
  • the source base station may be a base station corresponding to a source cell or a network device corresponding to the source cell
  • the target base station may be a base station corresponding to a target cell or a network device corresponding to the target cell.
  • Step 1 Measurement control and reporting.
  • the source base station performs measurement configuration on the terminal device.
  • the measurement results of the terminal device will be used to assist the source base station in making a handover decision.
  • the terminal device performs measurement reporting according to the measurement configuration.
  • Step 2 Handover determination: the source base station refers to the measurement report results of the terminal device and makes a handover decision based on its own handover algorithm.
  • Step 3 The source base station sends a handover request to the target base station.
  • the source base station sends a handover request message to the target base station.
  • the message contains relevant information for handover preparation, mainly X2 and S1 signaling context references of the terminal device, target cell identifier, key, RRC context, access stratum (AS) configuration, Evolved Universal Terrestrial Radio Access Network (E-UTRAN) radio access bearer (E-RAB) context, etc. It also contains the source cell physical layer identifier and message authentication verification code for the recovery process after possible handover failure.
  • the X2 and S1 signaling context references of the terminal device can help the target base station find the location of the source base station.
  • the E-RAB context includes the necessary radio network layer (RLN) and transport layer (TNL), addressing information, and E-RAB quality of service (QoS) information.
  • RNN radio network layer
  • TNL transport layer
  • QoS E-RAB quality of service
  • Part of the switching preparation information is contained in the interface message itself (such as the target cell identifier), and the other part exists in the RRC container of the interface message (such as the RRC context).
  • Step 4 Admission control.
  • the target base station performs admission control based on the received E-RAB QoS information to improve the success rate of handover. Admission control should consider reserving corresponding resources, cell radio network temporary identity (C-RNTI), and allocating dedicated random access preamble codes.
  • C-RNTI cell radio network temporary identity
  • the AS configuration used by the target cell can be a complete configuration that is completely independent of the source cell, or it can be an incremental configuration based on the source cell (incremental configuration means that the same part is not configured, and only different parts are reconfigured through signaling. The terminal device will continue to use the original configuration for the configuration that has not been received).
  • Step 5 The target base station sends a handover request confirmation to the source base station, and the target base station prepares for the handover and sends an Acknowledgement (ACK) message of the handover request to the source base station.
  • the message contains an RRC container, and the specific content is the handover command that triggers the terminal device to switch.
  • the source base station handover command is sent to the terminal device in a transparent manner (without any modification).
  • the handover command contains a new C-RNTI, the case algorithm identifier of the target base station, and may also carry a random access dedicated preamble code, access parameters, system information, etc.
  • the handover request ACK message may also carry radio network layer (RNL)/transport network layer (TNL) information for data forwarding.
  • RNL radio network layer
  • TNL transport network layer
  • Step 6 RAN handover is initiated.
  • Step 6 is that the source base station sends a handover command to the terminal device.
  • the handover command (RRC connection reconfiguration message carrying mobility control information) is generated by the target base station and transparently transmitted to the terminal device through the source base station.
  • the terminal device receives the message, it will use the relevant parameters in the message to initiate the handover process.
  • the terminal device does not need to wait for the Hybrid Automatic Repeat reQuest (HARQ)/Automatic Repeat reQuest (ARQ) response sent by the lower layer to the source base station to initiate the handover process.
  • HARQ Hybrid Automatic Repeat reQuest
  • ARQ Automatic Repeat reQuest
  • step 6 the terminal device leaves the source base station and synchronizes to the target base station.
  • Step 7 The source base station transfers the SN to the target base station, which can also be the SN status transmission.
  • the source base station sends a sequence number (SN, Sequence Number) status transfer message to the target base station, transmitting the uplink PDCP SN receiving status and downlink PDCP SN sending status of the E-RAB (only those E-RABs that need to retain the Packet Data Convergence Protocol (PDCP) status need to perform SN status forwarding, corresponding to the Radio Link Control (RLC) Acknowledged Mode (AM) mode).
  • RLC Radio Link Control
  • the source base station provides buffered data and new data from the UPF. Then, the UPF can send the user data to be transmitted to the terminal device to the source base station first, and the source base station forwards the user data to the target base station, and the target base station can buffer the user data from the source base station.
  • Step 8 RAN switching is completed.
  • the terminal device receives the switching command, it performs synchronization with the target cell. If a random access dedicated Preamble code is configured in the switching command, a non-competitive random access process is used to access the target cell. If no dedicated Preamble code is configured, a competitive random access process is used to access the target cell.
  • the terminal device will transmit user data with the UPF through the target base station.
  • Step 9 The target base station sends a path switching request to the AMF.
  • the target base station informs the AMF that the terminal device has changed cells through the path switching request message. At this time, the air interface switching has been successfully completed.
  • Step 10 Path switching in UPF can be achieved through the following steps: AMF sends a user plane update request to UPF, UPF converts the downlink data path, and UPF sends a user plane update response to AMF.
  • the UPF sends one or more "End Marker Packets" on the old path immediately after the path switch.
  • the "End Marker Packet” does not contain user data and is indicated by the GPRS Tunneling Protocol (GTP) header.
  • GTP GPRS Tunneling Protocol
  • the UPF should not send any data packets on the old path.
  • the source base station should send this packet to the target base station.
  • the target base station should discard the "End Marker Packet" and initiate any necessary processes to maintain the in-order delivery of users so that user data is transmitted between the UPF and the target base station.
  • Step 11 AMF sends a path switching request confirmation to the target base station, completing the path switching process.
  • Step 12 The target base station sends a terminal device context release to the source base station, and the source base station receives the terminal device context release sent by the target base station and releases the terminal device context.
  • NR R18 supports switching based on Layer 1/Layer 2 (L1/L2).
  • L1/L2 Layer 1/Layer 2
  • Switching based on L1/L2 is mainly aimed at the intra-central unit (intra-CU) switching scenario.
  • intra-CU intra-central unit
  • switching is performed based on Layer 1 or Layer 2 signaling.
  • LTE R14 introduces Random Access Channel-less (RACH-less) switching.
  • the terminal device's Timing Advance (TA) is 0 or the same as the TA value of the source cell.
  • TA Timing Advance
  • the terminal device After receiving the switching command, the terminal device can directly transmit uplink to the target base station.
  • the judgment condition for the terminal device to complete the switching is to receive the terminal device's contention resolution identity Media Access Control Control Element (MAC CE) sent by the target cell.
  • MAC CE Media Access Control Control Element
  • time advance may also be referred to as time advance, timing advance or timing advance.
  • RACH-less may be understood the same as RACH less.
  • reducing the latency of UE uplink synchronization is one of the main optimization directions of L1/L2 mobility, and one way is to obtain the TA of the UE in the target cell in advance. That is, when the handover is triggered, the UE does not need to perform the random access process for obtaining the TA again, but can interact with the target cell based on the obtained TA.
  • a potential problem with obtaining TA in advance is that when the UE actually performs a switch, the TA may no longer be valid due to the movement of the UE, or the link quality corresponding to the beam indicated by the network in the switch hit cannot meet the transmission requirements. In this case, the UE can only try uplink transmission until T304 times out and considers the switch to have failed.
  • the present application provides a method for falling back to traditional random access, avoiding unnecessary reconstruction process.
  • FIG3 is a flow chart of a communication method provided in an embodiment of the present application. As shown in FIG3 , the method includes:
  • the terminal device determines a target cell or first information; wherein the first information is used to indicate the target cell.
  • the terminal device accesses the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a handover to the first candidate cell.
  • the terminal device may determine the target cell or the first information according to the measurement result of at least one candidate cell.
  • the terminal device may measure at least one candidate cell to obtain the measurement result of at least one candidate cell.
  • the measurement result of at least one candidate cell may be included in a measurement report.
  • the terminal device may receive an identifier or first information of a target cell sent by a (source) network device.
  • the first information may include or indicate an identifier of the target cell.
  • the first information may also include or indicate information for accessing/or switching to the target cell.
  • the first information in the case where the first information is sent by the (source) network device to the terminal device, the first information may be included in the handover command, or may be included in the reconfiguration message, or may be included in other signaling in the reconfiguration message.
  • the terminal device accesses the target cell through a random access process, which may include that the terminal device can access the target cell through a random access process based on random access information of the target cell.
  • the random access information may include at least one of the following: a random access preamble, a random access resource, and a TA value.
  • the TA value may include an uplink TA value or a downlink TA value.
  • the random access information of the target cell may be determined by the terminal device, or may be determined by the network device and sent to the terminal device.
  • the random access information of the target cell may be included in the handover command, or may be included in the reconfiguration message, or may be included in other signaling in the reconfiguration message.
  • the terminal device triggers the connection re-establishment process, which may include: the terminal device sends a connection re-establishment request to the specific network device.
  • the terminal device may receive a connection re-establishment message sent by the specific network device, and the terminal device may send a connection re-establishment completion message to the specific network device.
  • the terminal device may receive a connection re-establishment rejection message sent by the specific network device.
  • the cell corresponding to the specific network device may be any cell that the terminal device can search for.
  • the specific network device may include any one of the following network devices: a source network device corresponding to a source cell, a target network device corresponding to a target cell, a network device corresponding to a first candidate cell, a network device corresponding to at least one candidate cell, and a network device corresponding to a cell other than at least one candidate cell.
  • the terminal device may determine the first candidate cell by itself and perform handover to the first candidate cell.
  • the terminal device may determine the first candidate cell according to a measurement result of at least one candidate cell.
  • the terminal device may determine the first candidate cell from at least one candidate cell.
  • the first information or the handover command may include the first candidate cell.
  • the TA values of at least two cells among the first candidate cell, the target cell, and the source cell may be the same or different.
  • performing switching to the first candidate cell may include: obtaining a TA value of the first candidate cell, and performing switching to the first candidate cell according to the TA value of the first candidate cell, or may include: initiating a random access procedure to access the first candidate cell.
  • the terminal device triggers the connection re-establishment process, or the terminal device determines the first candidate cell and performs switching to the first candidate cell, which may include: the terminal device triggers the connection re-establishment process, or determines the first candidate cell and performs switching to the first candidate cell according to at least one of the following: cell information of the target cell, access information of the target cell, and information for accessing and/or switching to the target cell.
  • the terminal device when the terminal device determines that it cannot access the target cell, the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a handover to the first candidate cell.
  • the terminal device determines that it cannot access the target cell, which may include: the terminal device determines that it cannot access the target cell based on information pre-acquired or sent by the source network device for accessing/or handing over to the target cell.
  • the terminal device may access the first candidate cell through the TA value of the first candidate cell.
  • the terminal device may access the first candidate cell through a random access procedure when the first candidate cell is determined.
  • the terminal device accessing the first candidate cell through a random access procedure may include: the terminal device may access the first candidate cell through a random access procedure based on random access information of the first candidate cell.
  • the random access information may include at least one of the following: a random access preamble, a random access resource, and a TA value.
  • the random access information of the target cell and/or the random access information of the first candidate cell may be pre-configured by the terminal device, or may be configured/activated by the source network device to the terminal device, or may be agreed upon by protocol.
  • the random access information of the target cell and/or the random access information of the first candidate cell may be included in the signaling/configuration indicating at least one candidate cell, or may be included in the handover command.
  • the random access resources of the target cell and/or the random access resources of the first candidate cell may be configured grant (CG) resources or dynamic grant (DG) resources.
  • the terminal device when the terminal device fails to access the target cell through the random access process, the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • the terminal device when the terminal device fails to access the target cell through the random access process, the terminal device triggers the connection re-establishment process.
  • the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • a terminal device determines a target cell or first information; wherein the first information is used to indicate a target cell; the terminal device accesses the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a handover to the first candidate cell.
  • the terminal device can access the target cell through a random access process, or can access any cell through a connection re-establishment process, or can access the first candidate cell, so that the terminal device can communicate in the target cell or the first candidate cell, thereby improving the reliability of information transmission.
  • the terminal device accesses the target cell through a random access procedure, including: within a first time period, when the terminal device fails to access the target cell, the terminal device accesses the target cell through a random access procedure.
  • the terminal device accesses the target cell through a random access procedure, and the corresponding terminal device does not access the target cell, which may include: the terminal device does not access the target cell according to one or more other access methods other than the random access procedure.
  • the one or more other access methods other than the random access procedure may include at least one of the following: the terminal device directly accesses the target cell (which may correspond to RACH-less switching), and the terminal device accesses the target cell according to the obtained TA value of the target cell (which may correspond to L1/L2 switching).
  • access may include the terminal device performing uplink transmission based on the acquired resources or monitoring the downlink message.
  • accessing the target cell may include: the terminal device sending an uplink message (such as the second information) to the target network device based on the acquired resources, or monitoring the downlink message (such as PDCCH or PDSCH) sent by the target network device.
  • accessing a specific cell (i.e., the cell corresponding to the specific network device)/the first candidate cell may include: the terminal device sending an uplink message to the network device corresponding to the specific network device/the first candidate cell based on the acquired resources, or monitoring the downlink message sent by the network device corresponding to the specific network device/the first candidate cell.
  • the first duration may be less than the duration of timer T304.
  • the start time of the first duration may be the same as the start time of timer T304.
  • the first duration may be determined according to pre-configuration information of the terminal device, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.
  • the first duration may be configured by the source network device through RRC signaling.
  • the first duration may be timer T304.
  • the terminal device may execute the step of accessing the target cell through a random access procedure.
  • the random access procedure includes a four-step random access procedure or a two-step random access procedure.
  • the terminal device fails to access the target cell, including: after the terminal device sends second information to the target network device, the terminal device fails to receive third information sent by the target network device.
  • the terminal device may send the second information via the uplink resources if there are available uplink resources.
  • the available uplink resources may be pre-configured by the source network device for the terminal device, such as the indication of the uplink resources may be included in the signaling/configuration for indicating at least one candidate cell to the terminal device, or the available uplink resources may be directly indicated or activated (for example, activating pre-configured resources) by the source network device to the terminal device, such as the indication of the uplink resources may be included in the switching command, or the available uplink resources may be agreed upon by the protocol.
  • the uplink resources in any embodiment of the present application may be configured authorized CG resources or dynamically authorized DG resources.
  • the terminal device fails to access the target cell, including: the terminal device fails to monitor a physical downlink control channel PDCCH or a physical downlink shared channel PDSCH sent by a target network device.
  • the terminal device may receive the second information, PDCCH or PDSCH on the downlink resource.
  • the downlink resource may be pre-configured by the terminal device, or may be configured by the source network device to the terminal device, or may be agreed upon by a protocol.
  • the terminal device monitors the downlink control channel PDCCH or PDSCH of the target cell.
  • the PDCCH is used to schedule or activate uplink resources and/or downlink resources.
  • the second information includes at least one of the following:
  • Reconfiguration completion message handover execution/completion media access control control unit MAC CE, cell radio network temporary identifier C-RNTI MAC CE, cache status report BSR, data message, scheduling request SR.
  • the third information includes at least one of the following: a contention resolution identifier MAC CE of the terminal device and downlink information.
  • the downlink information in any embodiment of the present application may include at least one of the following: downlink data information, PDCCH, PDSCH, downlink control information (Downlink Control Information, DCI), and downlink MAC CE.
  • the terminal device accesses the target cell through a random access procedure, including:
  • the terminal device sends Msg3/MsgA to the target network device; wherein, when the authorized size of the transmitted Msg3/MsgA payload is greater than or equal to the uplink media access control MAC protocol data unit PDU, the uplink MAC PDU is sent to the target network device via Msg3/MsgA.
  • the terminal device accesses the target cell through a random access procedure, including:
  • the terminal device sends Msg3/MsgA to the target network device; wherein, when the authorized size of the transmitted Msg3/MsgA payload is smaller than the uplink MAC PDU, the part or all of the MAC service data unit SDU and/or part or all of the MAC CE is determined from the uplink MAC PDU, and the part or all of the MAC SDU and/or part or all of the MAC CE is sent to the target network device via Msg3/MsgA.
  • At least one of the uplink MAC PDU, MAC SDU, and MAC CE may correspond to all or part of the second information.
  • the method also includes: the terminal device determines a timing advance TA value of the target cell; the terminal device accesses the target cell through a random access procedure, including: the terminal device accesses the target cell through a random access procedure after a second time period starting from the determination of the TA value of the target cell.
  • the terminal device determines the timing advance TA value of the target cell, which may be determined before the terminal device determines the target cell or the first information, or after the terminal device determines the target cell or the first information, or simultaneously.
  • the terminal device determines the timing advance TA value of the target cell, which may be determined before the terminal device determines the target cell or the first information.
  • the terminal device may determine the TA value of the target cell by itself, or the terminal device may receive the TA value of the target cell sent by the source network device.
  • the terminal device may first determine the TA value of the target cell, and then determine the target cell or the first information, thereby accessing the target cell according to the TA value of the target cell.
  • the terminal device may first determine the TA value of at least one candidate cell, and at least one candidate cell includes the target cell, and then the terminal device may determine the target cell or the first information, thereby accessing the target cell according to the TA value of the target cell.
  • the second duration may be determined according to pre-configuration information of the terminal device, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.
  • the start time of the second duration may be the time when the TA value of the target cell is determined, or may be determined according to the time when the TA value of the target cell is determined.
  • the second duration may be configured by the source network device through RRC signaling.
  • the second duration may be greater than a specific duration, wherein the specific duration may be the duration between the moment when the terminal device determines the TA value of the target cell and the moment when the terminal device determines the target cell or the first information.
  • the terminal device accesses the target cell through a random access procedure after a second time period starting from the determination of the TA value of the target cell, including: within the second time period starting from the determination of the TA value of the target cell, if the terminal device fails to access the target cell according to the TA value of the target cell, the terminal device accesses the target cell through a random access procedure after the second time period.
  • the terminal device determining the timing advance TA value of the target cell may include: the terminal device receiving the TA value of the target cell sent by a source network device.
  • the TA value of the target cell may be included in the handover command, or may be included in the reconfiguration message, or may be included in other signaling in the reconfiguration message.
  • the source network device may determine the TA value of the source network device and the terminal device, and obtain the TA difference between the source cell and the target cell, and determine the TA value of the target cell according to the TA value of the source network device and the terminal device and the TA difference.
  • the terminal device determining the timing advance TA value of the target cell may include: the terminal device sending an uplink reference signal to a source network device, and receiving the TA value of the target cell sent by the source network device.
  • the uplink reference signal may include at least one of the following: a sounding reference signal (Sounding Reference Signal, SRS), a demodulation reference signal (DeModulation Reference Signal, DMRS), and a phase tracking reference signal (Phase Tracking Reference Signal, PTRS).
  • SRS Sounding Reference Signal
  • DMRS demodulation Reference Signal
  • PTRS Phase Tracking Reference Signal
  • the source network device may send configuration information of an uplink reference signal to the terminal device, and the terminal device may send an uplink reference signal to the source network device according to the configuration information of the uplink reference signal.
  • the source network device may determine the TA value of the source network device and the terminal device according to the uplink reference signal sent by the terminal device, and then the source network device determines the TA value of the target cell according to the TA value and TA difference between the source network device and the terminal device.
  • the configuration information of the uplink reference signal may include resources for sending the uplink reference signal.
  • the terminal device determining the timing advance TA value of the target cell may include: the terminal device determining the TA value of the target cell according to a first measurement result of the target cell.
  • the terminal device may receive at least one candidate cell sent by the source network device, so that the terminal device may measure the at least one candidate cell and obtain a measurement result of the at least one candidate cell, wherein, since the at least one candidate cell includes the target cell, the terminal device can obtain a first measurement result of the target cell.
  • the measurement result of the at least one candidate cell may be included in a measurement report.
  • the terminal device measures at least one candidate cell according to the configuration information to obtain a measurement result of the at least one candidate cell
  • the at least one candidate cell may include a source cell and a target cell.
  • the terminal device may determine whether to switch to the target cell according to the measurement result of the at least one candidate cell.
  • the terminal may obtain a first measurement result of the target cell before determining the target cell to be switched, and further determine the TA value of the target cell.
  • the measurement result may include at least one of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Received Signal Strength Indicator (RSSI), and Signal to Interference and Noise Ratio (SINR).
  • RSRP Reference Signal Received Power
  • RSSI Received Signal Strength Indicator
  • SINR Signal to Interference and Noise Ratio
  • the terminal device determines the timing advance TA value of the target cell, which may include: the terminal device determines the TA value of the target cell based on the TA value of the source cell and the TA difference between the source cell and the target cell.
  • the terminal device may receive the TA difference between the source cell and the target cell sent by the source network device.
  • the TA value of the source cell and/or the TA difference between the source cell and the target cell may be included in the handover command, or may be included in the reconfiguration message, or may be included in other signaling in the reconfiguration message.
  • the terminal device determines the timing advance TA value of the target cell, which may include: the terminal device determines the TA value of the target cell through a random access process.
  • the terminal device may determine the TA value of the target cell through a random access process. If the terminal device fails to access the target cell according to the TA value of the target cell, the terminal device may determine a new TA value of the target cell through a random access process, and access the target cell through the new TA value.
  • the random access process can be triggered by a PDCCH order or by DCI, so that the terminal device can determine the TA value of the target cell.
  • the source network device can send a PDCCH order or DCI to the terminal device, and the terminal device initiates a random access process according to the PDCCH order or DCI, thereby obtaining the TA value of the target cell.
  • the method further comprises:
  • the terminal device Before the terminal device determines the target cell or the first information, the terminal device determines a first measurement result of the target cell; wherein the time of determining the first measurement result of the target cell corresponds to the time of determining the TA value of the target cell;
  • the terminal device determines a second measurement result of the target cell
  • the terminal device accesses the target cell through a random access process, including:
  • the terminal device accesses the target cell through a random access procedure.
  • the first measurement result of the target cell may be a measurement result of a measurement report.
  • the first measurement result of the target cell may be determined before the terminal device determines that it needs to switch to the target cell.
  • the time for determining the first measurement result of the target cell may be the same as the time for determining the TA value of the target cell, or may be separated by one or more time units.
  • a time unit may include at least one of the following or may be composed of at least one of the following: one or more frames, one or more subframes, one or more time slots, one or more symbols.
  • the time for determining the first measurement result of the target cell may be determined before, after, or simultaneously with the time for determining the TA value of the target cell.
  • the terminal device may determine that it needs to switch to the target cell.
  • the terminal device when the terminal device receives a handover command sent by the source network device or when the terminal device needs to perform a handover, the terminal device can directly send a message to the target network device according to the TA value of the target cell.
  • the terminal device when the terminal device receives a handover command sent by the source network device or when the terminal device needs to perform a handover, the terminal device re-determines the second measurement result of the target cell, and determines the way in which the terminal device accesses the target cell according to the first measurement result and the second measurement result.
  • the terminal device accesses the target cell through a random access procedure.
  • the terminal device determines that the TA value of the target cell does not meet the access requirements. At this time, the terminal device can determine the new TA value of the target cell through a random access process, and access the target cell according to the new TA value of the target cell, thereby avoiding the situation where the target cell cannot be accessed through the TA value of the target cell, resulting in reduced transmission reliability.
  • the TA value of the target cell may be referred to as an old TA value of the target cell or a first TA value of the target cell, and the new TA value of the target cell may be referred to as a second TA value of the target cell.
  • the method further comprises:
  • the terminal device When the absolute value of the difference between the first measurement result and the second measurement result is less than or equal to the first threshold, the terminal device performs switching to the target cell.
  • the terminal device can perform switching to the target cell according to the TA value of the target cell, or can access the target cell according to the TA value of the target cell.
  • the first threshold may be determined according to pre-configuration information of the terminal device, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.
  • the terminal device since the absolute value of the difference between the first measurement result and the second measurement result is less than or equal to the first threshold, the terminal device determines that the TA value of the target cell meets the access requirements. At this time, switching can be performed to the target cell based on the TA value of the target cell.
  • the terminal device accesses the target cell through a random access procedure, including:
  • the terminal device determines that the measurement result of the beam information of the target cell is less than or equal to a second threshold, the terminal device accesses the target cell through a random access procedure; wherein the beam information of the target cell is indicated by the first information.
  • the terminal device accesses the target cell through a random access procedure, including: when the terminal device determines the beam information of the target cell and there is no beam information with a measurement result greater than a second threshold, the terminal device accesses the target cell through a random access procedure.
  • the beam information may include a reference signal and/or resource information of the reference signal.
  • the beam information can be replaced by a reference signal or a downlink reference signal, that is, the beam information of the target cell can be replaced by the downlink reference signal of the target cell, or, in any embodiment of the present application, the beam information can correspond to a spatial domain filter, for example, a transmitting beam can correspond to a spatial domain transmission filter, and a receiving beam can correspond to a spatial domain receive filter.
  • the downlink reference signal may include at least one of the following: a synchronization signal block (Synchronization Signal Block, SSB), a channel state information reference signal (Channel State Information Reference Signal, CSI-RS).
  • SSB may also be called a synchronization signal/physical broadcast channel block (Synchronization Signal/Physical Broadcast Channel Block, SS/PBCH block).
  • the beam information of the target cell can be determined according to the pre-configuration information of the terminal device, or can be configured by the network device to the terminal device, or can be agreed upon by the protocol.
  • the beam information of the target cell can be included in the first information, or can be included in the handover command, or can be included in the reconfiguration message, or can be included in other signaling in the reconfiguration message.
  • the second threshold may be determined according to pre-configuration information of the terminal device, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.
  • the terminal device determines that the TA value of the target cell does not meet the access requirements. At this time, the terminal device can determine the new TA value of the target cell through a random access process and access the target cell according to the new TA value of the target cell.
  • the method further includes: when the terminal device determines that the measurement result of the beam information of the target cell is greater than the second threshold, the terminal device performs switching to the target cell.
  • the method further includes: when the terminal device determines the beam information of the target cell and there is beam information whose measurement result is greater than the second threshold, the terminal device performs switching to the target cell.
  • the terminal device determines that the TA value of the target cell meets the access requirements. At this time, switching can be performed to the target cell according to the TA value of the target cell.
  • the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a switch to the first candidate cell, including: within a third time period, when the terminal device fails to access the target cell, the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a switch to the first candidate cell.
  • the third duration may be determined according to pre-configuration information of the terminal device, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.
  • the timer corresponding to the third duration may be timer T304.
  • the start time of the third duration may be the same as or different from the start time corresponding to the first time.
  • the third duration may be configured by the source network device through RRC signaling.
  • the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs switching to the first candidate cell, and the corresponding terminal device fails to access the target cell, which may include: the terminal device fails to access the target cell according to one or more access methods other than the random access process, or may include: the terminal device fails to access the target cell according to the random access process, or may include: the terminal device fails to access the target cell according to one or more access methods other than the random access process and the random access process.
  • the terminal device may send a reason for the re-establishment procedure to the specific network device.
  • the first candidate cell may be a candidate cell other than the target cell.
  • the first candidate cell may be the target cell or a cell other than the target cell.
  • the terminal device may determine the TA value of the first candidate cell, and perform switching to the first candidate cell, or access the first candidate cell, according to the TA value of the first candidate cell.
  • the terminal device may perform a handover to the first candidate cell based on the TA value of the first candidate cell obtained before determining the first candidate cell.
  • the terminal device may perform a handover to the first candidate cell based on a new TA value of the first candidate cell obtained after determining the first candidate cell (for example, a new TA value obtained through a random access process).
  • the terminal device may perform a handover to the first candidate cell based on the TA value of the first candidate cell sent by the source network device; wherein the TA value of the first candidate cell sent by the source network device may be included in the handover command, or may be included in the reconfiguration message, or may be included in other signaling in the reconfiguration message.
  • the terminal device determines the third measurement result of the first candidate cell, wherein the time of determining the third measurement result of the first candidate cell corresponds to the time of determining the TA value of the first candidate cell; when the terminal device receives a handover command sent by a source network device or when the terminal device needs to perform a handover, the terminal device determines the fourth measurement result of the first candidate cell; when the absolute value of the difference between the third measurement result and the fourth measurement result is greater than a first threshold, the terminal device accesses the first candidate cell through a random access procedure. When the absolute value of the difference between the third measurement result and the fourth measurement result is less than or equal to the first threshold, the terminal device performs a handover to the first candidate cell according to the TA value of the first candidate cell.
  • the terminal device when the terminal device determines that the measurement result of the beam information of the first candidate cell is less than or equal to a second threshold, the terminal device accesses the first candidate cell through a random access procedure; wherein the beam information of the first candidate cell is indicated by the first information; or, when the terminal device determines that there is no beam information with a measurement result greater than the second threshold in the beam information of the first candidate cell, the terminal device accesses the first candidate cell through a random access procedure.
  • the terminal device when the terminal device determines that the measurement result of the beam information of the first candidate cell is greater than the second threshold, the terminal device performs switching to the first candidate cell; or, when the terminal device determines that there is beam information with a measurement result greater than the second threshold in the beam information of the first candidate cell, the terminal device performs switching to the first candidate cell.
  • the third duration is greater than the first duration corresponding to the terminal device accessing the target cell through a random access procedure.
  • the terminal device within a first time period, if the terminal device fails to access the target cell through the TA of the target cell or according to RACH-less, the terminal device can access the target cell through a random access procedure.
  • the terminal device triggers a connection re-establishment procedure, or determines a first candidate cell and performs a switch to the first candidate cell.
  • the start time of the timer corresponding to the first duration and/or the third duration is determined according to the time when the terminal device determines to reach the target cell.
  • the start time of the timer corresponding to the first duration and/or the third duration may be the moment when the terminal device determines to reach the target cell.
  • the start time of the timer corresponding to the first duration and/or the third duration may be separated from the moment when the terminal device determines to reach the target cell by one or more time units.
  • the start time of the timer corresponding to the first duration and/or the third duration may be before or after the moment when the terminal device determines to reach the target cell, or the start time of the timer corresponding to the first duration and/or the third duration may be the same as the moment when the terminal device determines to reach the target cell.
  • the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a switch to the first candidate cell, including: when the terminal device determines that the measured value of the beam information of the target cell is less than a third threshold, triggering a connection re-establishment process, or determining a first candidate cell, and performing a switch to the first candidate cell.
  • the third threshold may be determined according to pre-configuration information of the terminal device, or may be configured by the network device to the terminal device, or may be agreed upon by a protocol.
  • performing handover to the first candidate cell may include sending data information or an access request to a network device corresponding to the first candidate cell, where the data information or the access request may carry an identifier of the source cell and/or an identifier of the target cell.
  • the network device corresponding to the first candidate cell may receive the context of the terminal device from the source network device or the target network device according to the identifier of the source cell and/or the identifier of the target cell sent by the terminal device.
  • determining the first candidate cell includes:
  • the first candidate cell is determined according to a measurement result of at least one candidate cell; wherein the at least one candidate cell is indicated by a source network device to the terminal device.
  • the first candidate cell may be: a candidate cell corresponding to a highest measurement result among measurement results of at least one candidate cell.
  • the first candidate cell may be: a candidate cell corresponding to a highest measurement result among measurement results of cells other than the target cell among at least one candidate cell.
  • the terminal device determines the target cell or the first information, including: the terminal device receives a switching command sent by a source network device, and the switching command carries the identifier of the target cell or the first information.
  • the terminal device determines the target cell or the first information, including: the terminal device determines the target cell or the first information based on the measurement result of at least one candidate cell; wherein the at least one candidate cell is indicated by the source network device to the terminal device.
  • the first information includes at least one of the following:
  • the TA difference between the source cell and the target cell is the TA difference between the source cell and the target cell
  • the TA difference between the source cell and the target cell may also be referred to as a TA adjustment value in other embodiments.
  • the beam information may include at least one of the following: transmission configuration indication (TCI) state (TCI state), SSB index (SSB index), and CSI-RS index (CSI-RS index).
  • TCI transmission configuration indication
  • SSB index SSB index
  • CSI-RS index CSI-RS index
  • the resource information configured by the target cell to the terminal device may include granted CG resources or DG resources.
  • the terminal device when the handover command received by the terminal device carries an L1/L2 handover type indication, the terminal device performs an L1/L2 handover.
  • the terminal device when the handover command received by the terminal device carries an RACH-less handover type indication, the terminal device performs an RACH-less handover.
  • the method further includes: storing/generating a first report when the terminal device successfully switches to the first candidate cell.
  • the method further includes: storing/generating a second report when the terminal device successfully performs random access to the target cell.
  • the first report and/or the second report may include at least one of the following: a measurement result obtained by the terminal device on at least one candidate cell before determining the target cell, a measurement result obtained by the terminal device on at least one candidate cell after determining the target cell, a first measurement result of the target cell, a second measurement result of the target cell, beam information of the target cell, the target cell indicated in the switching command, the target cell determined by the terminal device according to the measurement report, the TA value of the target cell, the new TA value of the target cell, and the identifier of the first candidate cell.
  • the method further comprises one of the following:
  • the terminal device sends the first report to the network device corresponding to the first candidate cell
  • the terminal device sends the second report to the target network device
  • the terminal device receives a first reporting request sent by a network device corresponding to the first candidate cell, and the terminal device sends the first report to the network device corresponding to the first candidate cell;
  • the terminal device receives a second reporting request sent by the target network device, and the terminal device sends the second report to the target network device;
  • the terminal device sends indication information for indicating that the first report is stored to the network device corresponding to the first candidate cell, the terminal device receives the first reporting request sent by the network device corresponding to the first candidate cell, and the terminal device sends the first report to the network device corresponding to the first candidate cell;
  • the terminal device sends indication information to the target network device for indicating that the second report is stored, the terminal device receives the second reporting request sent by the target network device, and the terminal device sends the second report to the target network device.
  • the terminal device may report the first report or the second report to the network device corresponding to the first candidate cell or the target network device each time the terminal device receives the first report or the second report.
  • the network device corresponding to the first candidate cell may send a first reporting request to the terminal device, or the terminal device sends indication information indicating that the first report is stored to the network device corresponding to the first candidate cell.
  • the target network device may send a second reporting request to the terminal device, or the terminal device sends indication information to the target network device to indicate that the second report is stored.
  • the network device corresponding to the first candidate cell may train or optimize the internally stored AI model according to the first report.
  • the target network device may train or optimize the internally stored AI model according to the second report.
  • the method before the terminal device accesses the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs a handover to the first candidate cell, the method further includes:
  • the terminal device performs L1/L2 switching to the target cell; or,
  • the terminal device performs RACH less switching to the target cell.
  • the terminal device performing L1/L2 switching to the target cell may include: the terminal device performing L1/L2 switching to the target cell according to a TA value of the target cell.
  • the terminal device performs RACH less switching to the target cell, which may include: the terminal device performs RACH less switching to the target cell according to a TA value of the target cell being 0, or the terminal device performs RACH less switching to the target cell according to the TA value of the source cell.
  • FIG4 is a flow chart of another communication method provided in an embodiment of the present application. As shown in FIG4 , the method includes:
  • the source network device sends an identifier or first information of a target cell to the terminal device; wherein the first information is used to indicate the target cell;
  • the identifier of the target cell or the first information is used by the terminal device to access the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • the identifier or the first information of the target cell may be included in the handover command, or may be included in the reconfiguration message, or may be included in other signaling in the reconfiguration message.
  • the first information includes at least one of the following:
  • the UE determines the target cell and/or the first information, and initiates a handover procedure to the target cell based on the first information.
  • the UE initiating a handover process to the target cell includes at least one of the following (a)-(d) (for a handover triggered by the network, this refers to an act of receiving a handover command):
  • the UE sends a first uplink message (corresponding to the second information in the above embodiment) to the target network device.
  • the first uplink message may include at least one of the following: a reconfiguration completion message, a switching execution/completion MAC CE, a C-RNTI MAC CE, a cache status report BSR, data, a scheduling request SR, etc.
  • the UE After sending the first uplink message, the UE monitors the second downlink information (corresponding to the third information in the above embodiment) sent by the target network device, and the second downlink information is used to respond to the first uplink message. Optionally, after receiving the second downlink information, the UE stops the first timer and/or the second timer.
  • the switching execution/completion MAC CE is used to respond to the configuration information of the target cell, that is, the UE uses the configuration information provided by the target cell.
  • this step is performed.
  • the first timer is used for the UE to fall back to the random access process in a timely manner to avoid switching failure due to invalid TA or unreasonable beam indication.
  • the second timer may be timer T304, and the duration corresponding to the second timer is the third duration).
  • the second timer may be a timer in the related art, used to determine whether the handover fails, and is started when the UE receives a handover command. If the handover is successful, the timer is stopped. If the timer expires, the handover is considered to have failed, and a link re-establishment process is triggered.
  • the first timer duration may be less than the second timer duration.
  • the first timer timeout behavior includes at least one of the following (a)-(c):
  • the UE triggers connection re-establishment or executes (c).
  • the UE triggers connection re-establishment or executes (c).
  • the UE triggers connection re-establishment or executes (c).
  • the UE triggers connection re-establishment or executes (c).
  • (c) determining a first candidate cell from at least one candidate cell, performing a handover to the first candidate cell, and restarting a second timer.
  • At least one candidate cell is preconfigured to the UE by the network.
  • the timing of restarting the second timer may be determined according to the moment when the first candidate cell is determined, or may be determined according to the moment when the terminal device sends a message to the network device corresponding to the first candidate cell.
  • the UE transmits the first uplink message through the uplink resources pre-configured or dynamically scheduled by the network, and stores the MAC PDU of the first uplink message in the first buffer.
  • the UE determines the transmission mode according to whether the grant size of the transmitted Msg3/MsgA matches the size of the first uplink message:
  • the UE can obtain the MAC PDU of the first uplink message from the first buffer and transmit it through Msg3/MsgA; specifically, the UE obtains the MAC PDU from the first buffer (HARQ buffer) and stores it in the Msg3/A buffer.
  • the UE obtains the MAC PDU of the first uplink message from the first buffer, and instructs the multiplexing and assembly entity to reassemble the first uplink message according to the grant size of the Msg3/MsgA payload, and the newly assembled first uplink message includes all or part of the MAC SDU/MAC CE in the original first uplink message.
  • the Multiplexing and assembly entity is instructed to carry MAC subPDU(s) in the new transmission, and the MAC subPDU(s) includes the MAC SDU in the MAC PDU.
  • the UE before the UE determines the target cell, the UE determines the TA value of the target cell, and simultaneously starts a third timer and or stores the current first RSRP, wherein the first RSRP is included in the first measurement result.
  • the UE determines the TA value of the target cell including one of the following:
  • UE receives the TA value of the target cell sent by the source network, such as TA command MAC CE;
  • the UE determines the TA value of the target cell by itself, for example, by calculating it by the UE side itself.
  • the UE may report information for determining the TA value to the source network device/target network device. For example, the UE may determine the TA value through RSRP or downlink (DL) TA timing difference.
  • RSRP downlink
  • DL downlink
  • the third timer can be used to maintain the validity of the TA value of the target cell.
  • the third timer is started/restarted. During the operation of the third timer, the TA value is considered valid. If the third timer times out when the UE initiates a handover to the target cell, the UE considers the TA value invalid and falls back to the RACH-based handover process (same as the first timer timeout behavior).
  • the UE may store the first RSRP when determining the TA of the target cell, in order to determine the validity of the TA value of the target cell.
  • the second RSRP is determined. If the difference between the first RSRP and the second RSRP exceeds a preconfigured threshold value (corresponding to the first threshold value in the above embodiment), the TA value of the target cell is considered invalid.
  • the handover process based on RACH is returned.
  • the second RSRP is included in the second measurement result.
  • the UE's behavior may include one of the following (a)-(b):
  • the stop condition of the first timer may include:
  • the UE receives a first downlink message sent by the target network device.
  • the first downlink message may be any message carried by the PDCCH or PDSCH.
  • the first downlink message may be a UE contention resolution identity MAC CE (contention resolution identity MAC CE).
  • the first information includes at least one of the following:
  • serving cell index wherein the serving cell index may also be referred to as the index of the target cell;
  • the TA information of the target cell may include a TA value of the target cell, or a TA adjustment value of the target cell;
  • the beam information of the target cell may include at least one of the following: TCI state of the target cell, SSB index of the target cell, CSI-RS index of the target cell;
  • a first resource or a first resource identifier may include a CG resource or a DG resource;
  • the first resource may be resource information configured by the target cell to the terminal device in the above embodiment.
  • the UE determines the target cell includes one of the following (a)-(b):
  • NW-based Network-based
  • UE-based UE determines the target cell based on conditions/measurement events
  • a first report is stored/generated.
  • a second report is stored/generated.
  • the UE reports to the network the first and/or second reports currently stored, and reports the first/second reports based on indication information on the network side.
  • the terminal device may adopt a fallback random access method in advance to avoid connection re-establishment due to a switching failure.
  • An embodiment of the present application provides a method for random access based on timer fallback, including a UE determining to perform RACH-less switching or L1/L2 switching, or to perform a RACH-based switching process based on the validity of a first timer and/or a TA value.
  • the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.
  • downlink indicates that the transmission direction of the signal or data
  • uplink is used to indicate that the transmission direction of the signal or data is the second direction sent from the user equipment of the cell to the site
  • side is used to indicate that the transmission direction of the signal or data is the third direction sent from the user equipment 1 to the user equipment 2.
  • downlink signal indicates that the transmission direction of the signal is the first direction.
  • the term "and/or” is only a description of the association relationship of the associated objects, indicating that there can be three relationships. Specifically, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character “/" in this article generally indicates that the front and back associated objects are in an "or" relationship.
  • FIG5 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • the communication device 500 may be applied in a terminal device, or may be a terminal device, wherein the communication device 500 includes:
  • the determining unit 501 is used to: determine a target cell or first information; wherein the first information is used to indicate the target cell;
  • the communication unit 502 is used to: access the target cell through a random access process, or trigger a connection re-establishment process, or perform a handover to a determined first candidate cell.
  • the communication unit 502 is further used to: if the target cell is not accessed within the first time period, access the target cell through a random access process.
  • the random access procedure includes a four-step random access procedure or a two-step random access procedure.
  • the communication unit 502 is further used for: after sending the second information to the target network device, not receiving the third information sent by the target network device.
  • the communication unit 502 is further configured to: fail to monitor a physical downlink control channel PDCCH or a physical downlink shared channel PDSCH sent by the target network device.
  • the second information includes at least one of the following:
  • Reconfiguration completion message handover execution/completion media access control control unit MAC CE, cell radio network temporary identifier C-RNTI MAC CE, cache status report BSR, data message, scheduling request SR.
  • the third information includes at least one of the following: UE contention resolution identifier MAC CE, downlink information.
  • the communication unit 502 is further used to: send Msg3/MsgA to the target network device; wherein, when the authorized size of the transmitted Msg3/MsgA payload is greater than or equal to the uplink media access control MAC protocol data unit PDU, the uplink MAC PDU is sent to the target network device via Msg3/MsgA.
  • the communication unit 502 is also used to: send Msg3/MsgA to the target network device; wherein, when the authorized size of the transmitted Msg3/MsgA payload is smaller than the uplink MAC PDU, determine part or all of the MAC service data unit SDU and/or part or all of the MAC CE from the uplink MAC PDU, and send part or all of the MAC SDU and/or part or all of the MAC CE to the target network device via Msg3/MsgA.
  • the determination unit 501 is further used to: determine a timing advance TA value of the target cell; the communication unit 502 is further used to: access the target cell through a random access process after a second time period starting from the determination of the TA value of the target cell.
  • the communication unit 502 is further used to: within the second time period starting from determining the TA value of the target cell, if the target cell is not accessed according to the TA value of the target cell, access the target cell through a random access process after the second time period.
  • the communication unit 502 is further used to: receive the TA value of the target cell sent by the source network device.
  • the communication unit 502 is further used to: send an uplink reference signal to a source network device, and receive a TA value of the target cell sent by the source network device.
  • the determining unit 501 is further configured to: determine a TA value of the target cell according to the first measurement result of the target cell.
  • the determining unit 501 is further configured to: determine the TA value of the target cell according to the TA value of the source cell and the TA difference between the source cell and the target cell.
  • the determination unit 501 is further configured to: determine the TA value of the target cell through a random access procedure.
  • the determining unit 501 is further configured to: determine a first measurement result of the target cell before determining the target cell or the first information; wherein the time of determining the first measurement result of the target cell corresponds to the time of determining the TA value of the target cell; upon receiving a handover command sent by a source network device or when a handover needs to be performed, determine a second measurement result of the target cell;
  • the communication unit 502 is further configured to: when an absolute value of a difference between the first measurement result and the second measurement result is greater than a first threshold, access the target cell through a random access procedure.
  • the communication unit 502 is further configured to: when an absolute value of a difference between the first measurement result and the second measurement result is less than or equal to the first threshold, perform handover to the target cell.
  • the communication unit 502 is also used to: when it is determined that the measurement result of the beam information of the target cell is less than or equal to a second threshold, access the target cell through a random access procedure; wherein the beam information of the target cell is indicated by the first information.
  • the communication unit 502 is further used to: when it is determined that there is no beam information with a measurement result greater than a second threshold in the beam information of the target cell, access the target cell through a random access process.
  • the communication unit 502 is further used to: when it is determined that the measurement result of the beam information of the target cell is greater than the second threshold, perform switching to the target cell.
  • the communication unit 502 is further used to: when it is determined that, in the beam information of the target cell, there is beam information whose measurement result is greater than the second threshold, perform switching to the target cell.
  • the communication unit 502 is further used to: trigger a connection re-establishment process when the target cell is not accessed within a third time period, or determine a first candidate cell and perform a handover to the first candidate cell.
  • the third duration is greater than a first duration corresponding to when the communication device 500 accesses the target cell through a random access procedure.
  • the start time of the timer corresponding to the first duration and/or the third duration is determined according to the time when the communication device 500 determines to reach the target cell.
  • the communication unit 502 is further used to: trigger a connection re-establishment process when it is determined that the measured value of the beam information of the target cell is less than a third threshold, or determine a first candidate cell and perform a switch to the first candidate cell.
  • the determination unit 501 is further used to: determine the first candidate cell according to a measurement result of at least one candidate cell; wherein the at least one candidate cell is indicated by a source network device to the communication apparatus 500.
  • the communication unit 502 is further used to: receive a handover command sent by a source network device, wherein the handover command carries the identifier of the target cell or the first information.
  • the determination unit 501 is further used to: determine the target cell or the first information according to a measurement result of at least one candidate cell; wherein the at least one candidate cell is indicated by a source network device to the communication apparatus 500.
  • the first information includes at least one of the following:
  • the TA difference between the source cell and the target cell is the TA difference between the source cell and the target cell
  • the communication device 500 further includes: a storage unit, the storage unit being used to: store/generate a first report when the handover to the first candidate cell is successful; or store/generate a second report when the random access to the target cell is successful.
  • the communication unit 502 is further configured to:
  • the communication unit 502 is further used to: perform L1/L2 switching to the target cell; or perform RACH less switching to the target cell.
  • FIG6 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • the communication device 600 can be applied in a source network device, or can be a source network device, wherein the communication device 600 includes:
  • the communication unit 601 is configured to send an identifier or first information of a target cell to a terminal device; wherein the first information is used to indicate the target cell;
  • the identifier of the target cell or the first information is used by the terminal device to access the target cell through a random access process, or the terminal device triggers a connection re-establishment process, or the terminal device determines a first candidate cell and performs switching to the first candidate cell.
  • the communication device 600 further includes a determining unit 602, and the determining unit 602 is used to determine an identifier or first information of a target cell.
  • the first information includes at least one of the following:
  • FIG7 is a schematic structural diagram of a communication device provided in an embodiment of the present application, and the communication device 700 may include one of the following: a terminal device or a source network device.
  • the communication device 700 shown in FIG7 may include a processor 710 and a memory 720, wherein the memory 720 stores a computer program that can be run on the processor 710, and the processor 710 implements the communication method in any of the above embodiments when executing the program.
  • the memory 720 may be a separate device from the processor 710 , or may be integrated into the processor 710 .
  • the communication device 700 may further include a transceiver 730 , and the processor 710 may control the transceiver 730 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.
  • the transceiver 730 may include a transmitter and a receiver.
  • the transceiver 730 may further include an antenna, and the number of the antennas may be one or more.
  • the communication device 700 may specifically be a terminal device or a source network device of an embodiment of the present application, and the communication device 700 may implement the corresponding processes implemented by the terminal device or the source network device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.
  • An embodiment of the present application further provides a computer storage medium, which stores one or more programs.
  • the one or more programs can be executed by one or more processors to implement the communication method in any embodiment of the present application.
  • the computer-readable storage medium can be applied to the terminal device or source network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the terminal device or source network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.
  • FIG8 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • the chip 800 shown in FIG8 includes a processor 810.
  • the processor 810 is used to call and run a computer program from a memory to implement a method in any embodiment of the present application.
  • the chip 800 may further include a memory 820.
  • the processor 810 may call and run a computer program from the memory 820 to implement the method in the embodiment of the present application.
  • the memory 820 may be a separate device independent of the processor 810 , or may be integrated into the processor 810 .
  • the chip 800 may further include an input interface 830.
  • the processor 810 may control the input interface 830 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.
  • the chip 800 may further include an output interface 840.
  • the processor 810 may control the output interface 840 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.
  • the chip can be applied to the terminal device or source network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the terminal device or source network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.
  • the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.
  • An embodiment of the present application also provides a computer program product, which includes a computer storage medium, the computer storage medium storing a computer program, and the computer program including instructions that can be executed by at least one processor.
  • the instructions are executed by the at least one processor, the communication method in any embodiment of the present application is implemented.
  • the computer program product can be applied to the terminal device or source network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the terminal device or source network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.
  • the computer program product in the embodiments of the present application may also be referred to as a software product in other embodiments.
  • An embodiment of the present application also provides a computer program, which enables a computer to execute the communication method in any embodiment of the present application.
  • the computer program can be applied to the terminal device or source network device in the embodiments of the present application.
  • the computer program runs on the computer, the computer executes the corresponding processes implemented by the terminal device or source network device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.
  • the processor, communication device, processor or chip of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • each step of the above method embodiment can be completed by the hardware integrated logic circuit in the processor or the instruction in the form of software.
  • the above processor, communication device or chip may include any one or more of the following integrations: general processor, application specific integrated circuit (Application Specific Integrated Circuit, ASIC), digital signal processor (Digital Signal Processor, DSP), digital signal processing device (Digital Signal Processing Device, DSPD), programmable logic device (Programmable Logic Device, PLD), field programmable gate array (Field Programmable Gate Array, FPGA), central processing unit (Central Processing Unit, CPU), graphics processing unit (Graphics Processing Unit, GPU), embedded neural network processor (neural-network processing units, NPU), controller, microcontroller, microprocessor, programmable logic device, discrete gate or transistor logic device, discrete hardware component.
  • the disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed.
  • the general processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the steps of the method disclosed in the embodiment of the present application may be directly embodied as being executed by a hardware decoding processor, or may be executed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc.
  • the storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory or computer storage medium in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory.
  • the volatile memory may be a random access memory (RAM), which is used as an external cache.
  • RAM Direct Rambus RAM
  • SRAM Static RAM
  • DRAM Dynamic RAM
  • SDRAM Synchronous DRAM
  • DDR SDRAM Double Data Rate SDRAM
  • ESDRAM Enhanced SDRAM
  • SLDRAM Synchlink DRAM
  • DR RAM Direct Rambus RAM
  • the memory in the embodiments 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 link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • a time interval, a time period, a duration range, a duration or a time window, etc. may include all endpoint times, or may include part of the endpoint times (for example, including the left endpoint time but not the right endpoint time, or including the right endpoint time but not the left endpoint time), or may not include the endpoint time.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art.
  • the computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

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Abstract

本申请实施例提供一种通信方法、装置、设备、存储介质、芯片、产品及程序，该方法包括：终端设备确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。

Description

通信方法、装置、设备、存储介质、芯片、产品及程序 技术领域
本申请实施例涉及移动通信技术领域，具体涉及一种通信方法、装置、设备、存储介质、芯片、产品及程序。
背景技术
终端设备可以通过切换流程从源小区切换至目标小区，然而，在终端设备切换失败的情况下，终端设备可能不能建立与目标小区的连接，导致终端无法与目标小区通信，从而降低了信息传输的可靠性。
发明内容
本申请实施例提供一种通信方法、装置、设备、存储介质、芯片、产品及程序。
第一方面，本申请实施例提供一种通信方法，所述方法包括：
终端设备确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；
所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
第二方面，本申请实施例提供一种通信方法，所述方法包括：
源网络设备向终端设备发送目标小区的标识或第一信息；其中，所述第一信息用于指示目标小区；
所述目标小区的标识或所述第一信息，用于所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
第三方面，本申请实施例提供一种通信装置，包括：
确定单元，用于：确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；
通信单元，用于：通过随机接入流程接入所述目标小区，或者触发连接重建立流程，或者向所述终端设备确定的第一候选小区执行切换。
第四方面，本申请实施例提供一种通信装置，包括：
通信单元，用于：向终端设备发送目标小区的标识或第一信息；其中，所述第一信息用于指示目标小区；
所述目标小区的标识或所述第一信息，用于所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
第五方面，本申请实施例提供一种通信设备，包括：处理器和存储器，
所述存储器存储有可在处理器上运行的计算机程序，
所述处理器执行所述程序时实现第一方面或第二方面所述方法。
第六方面，本申请实施例提供一种计算机存储介质，所述计算机存储介质存储有一个或者多个程序，所述一个或者多个程序可被一个或者多个处理器执行，以实现第一方面或第二方面所述方法。
第七方面，本申请实施例提供一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，以实现如第一方面或第二方面所述方法。
第八方面，本申请实施例提供一种计算机程序产品，所述计算机程序产品包括计算机存储介质，所述计算机存储介质存储计算机程序，所述计算机程序包括能够由至少一个处理器执行的指令，当所述指令由所述至少一个处理器执行时实现第一方面或第二方面所述方法。
第九方面，本申请实施例提供一种计算机程序，所述计算机程序使得计算机执行如第一方面或第二方面所述方法。
在本申请实施例中，终端设备确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。这样，终端设备可以通过随机接入流程接入目标小区，或者，可以通过连接重建立流程接入目标小区，或者可以接入至第一候选小区，从而使得终端设备能够在目标小区或第一候选小区通信，提高了信息传输的可靠性。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1为本申请实施例的一个应用场景的示意图；
图2为本申请实施例提供的一种切换流程的示意图；
图3为本申请实施例提供的一种通信方法的流程示意图；
图4为本申请实施例提供的另一种通信方法的流程示意图；
图5为本申请实施例提供的一种通信装置的结构组成示意图；
图6为本申请实施例提供的另一种通信装置的结构组成示意图；
图7为本申请实施例提供的一种通信设备示意性结构图；
图8为本申请实施例的芯片的示意性结构图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请实施例所记载的技术方案之间，在不冲突的情况下，可以任意组合。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
图1为本申请实施例的一个应用场景的示意图。如图1所示，通信系统100可以包括终端设备110和网络设备120。网络设备120可以通过空口与终端设备110通信。终端设备110和网络设备120之间支持多业务传输。
应理解，本申请实施例仅以通信系统100进行示例性说明，但本申请实施例不限定于此。也就是说，本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、新无线(New Radio，NR)系统、NR系统的演进系统、免授权频谱上的LTE(LTE-based access to unlicensed spectrum，LTE-U)系统、免授权频谱上的NR(NR-based access to unlicensed spectrum，NR-U)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、无线局域网(Wireless Local Area Networks，WLAN)、无线保真(Wireless Fidelity，WiFi)、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、物联网(Internet of Things，IoT)系统、窄带物联网(Narrow Band Internet of Things，NB-IoT)系统、增强的机器类型通信(enhanced Machine-Type Communications，eMTC)系统、或未来的通信系统(例如6G、7G通信系统)等。
本申请实施例中的网络设备120可以包括接入网设备121和/或核心网设备122。接入网设备可以为特定的地理区域提供通信覆盖，并且可以与位于该覆盖区域内的终端设备110(例如UE)进行通信。
本申请中的终端是一种具有无线通信功能的设备，可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。本申请中的终端设备可以称为用户设备(User Equipment，UE)、移动台(Mobile Station，MS)、移动终端(Mobile Terminal，MT)、用户单元、用户站、移动站、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备可以包括以下之一或者至少两者的组合：物联网设备、卫星终端、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal  Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、服务器、手机(mobile phone)、平板电脑(Pad)、带无线收发功能的电脑、掌上电脑、台式计算机、个人数字助理、便捷式媒体播放器、智能音箱、导航装置、智能手表、智能眼镜、智能项链等可穿戴设备、计步器、数字TV、虚拟现实(Virtual Reality，VR)终端设备、增强现实(Augmented Reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端以及车联网系统中的车、车载设备、车载模块、无线调制解调器(modem)、手持设备(handheld)、客户终端设备(Customer Premise Equipment，CPE)、智能家电等。
可选地，终端设备110可以是任意终端设备，其包括但不限于与网络设备120或其它终端设备采用有线或者无线连接的终端设备。
可选地，终端设备110可以用于设备到设备(Device to Device，D2D)的通信。
接入网设备121可以包括以下之一或者至少两者的组合：长期演进(Long Term Evolution，LTE)系统中的演进型基站(Evolutional Node B，eNB或eNodeB)、下一代无线接入网(Next Generation Radio Access Network，NG RAN)设备、NR系统中的基站(gNB)、小站、微站、云无线接入网络(Cloud Radio Access Network，CRAN)中的无线控制器、无线保真(Wireless-Fidelity，Wi-Fi)的接入点、传输接收点(transmission reception point，TRP)、中继站、接入点、车载设备、可穿戴设备、集线器、交换机、网桥、路由器、未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)中的网络设备等。
核心网设备122可以是5G核心网(5G Core，5GC)设备，核心网设备122可以包括以下之一或者至少两者的组合：接入与移动性管理功能(Access and Mobility Management Function，AMF)、认证服务器功能(Authentication Server Function，AUSF)、用户面功能(User Plane Function，UPF)、会话管理功能(Session Management Function，SMF)、位置管理功能(Location Management Function，LMF)、策略控制功能(Policy Control Function，PCF)。在另一些实施方式中，核心网络设备也可以是LTE网络的分组核心演进(Evolved Packet Core，EPC)设备，例如，会话管理功能+核心网络的数据网关(Session Management Function+Core Packet Gateway，SMF+PGW-C)设备。应理解，SMF+PGW-C可以同时实现SMF和PGW-C所能实现的功能。在网络演进过程中，上述核心网设备122也有可能叫其它名字，或者通过对核心网的功能进行划分形成新的网络实体，对此本申请实施例不做限制。
通信系统100中的各个功能单元之间还可以通过下一代网络(next generation，NG)接口建立连接实现通信。
例如，终端设备通过NR接口与接入网设备建立空口连接，用于传输用户面数据和控制面信令；终端设备可以通过NG接口1(简称N1)与AMF建立控制面信令连接；接入网设备例如下一代无线接入基站(gNB)，可以通过NG接口3(简称N3)与UPF建立用户面数据连接；接入网设备可以通过NG接口2(简称N2)与AMF建立控制面信令连接；UPF可以通过NG接口4(简称N4)与SMF建立控制面信令连接；UPF可以通过NG接口6(简称N6)与数据网络交互用户面数据；AMF可以通过NG接口11(简称N11)与SMF建立控制面信令连接；SMF可以通过NG接口7(简称N7)与PCF建立控制面信令连接。
图1示例性地示出了一个基站、一个核心网设备和两个终端设备，可选地，该无线通信系统100可以包括多个基站设备并且每个基站的覆盖范围内可以包括其它数量的终端设备，本申请实施例对此不做限定。
需要说明的是，图1只是以示例的形式示意本申请所适用的系统，当然，本申请实施例所示的方法还可以适用于其它系统。此外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。还应理解，在本申请的实施例中提到的“指示”可以是直接指示，也可以是间接指示，还可以是表示具有关联关系。举例说明，A指示B，可以表示A直接指示B，例如B可以通过A获取；也可以表示A间接指示B，例如A指示C，B可以通过C获取；还可以表示A和B之间具有关联关系。还应理解，在本申请的实施例中提到的“对应”可表示两者之间具有直接对应或间接对应的关系，也可以表示两者之间具有关联关系，也可以是指示与 被指示、配置与被配置等关系。还应理解，在本申请的实施例中提到的“预定义”、“协议约定”、“预先确定”或“预定义规则”可以通过在设备(例如，包括终端设备和网络设备)中预先保存相应的代码、表格或其他可用于指示相关信息的方式来实现，本申请对于其具体的实现方式不做限定。比如预定义可以是指协议中定义的。还应理解，本申请实施例中，所述“协议”可以指通信领域的标准协议，例如可以包括LTE协议、NR协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。
为便于理解本申请实施例的技术方案，以下对本申请实施例的相关技术进行说明，以下相关技术作为可选方案与本申请实施例的技术方案可以进行任意结合，其均属于本申请实施例的保护范围。
当正在使用网络服务的终端设备从一个小区移动到另一个小区，或由于无线传输业务负荷量调整、激活操作维护、设备故障等原因，为了保证通信的连续性和服务的质量，系统要将该终端设备与源小区的通信链路转移到新的目标小区上，即执行切换过程。
图2为本申请实施例提供的一种切换流程的示意图，如图2所示，以Xn接口切换过程为例，整个切换过程可以分为以下三个阶段：
(1)切换准备：包括测量控制和汇报，切换请求以及确认。在切换确认消息中包含目标小区生成的切换命令，源小区不允许对目标小区生成的切换命令进行任何修改，直接将切换命令转发给终端设备。
(2)切换执行：终端设备在收到切换命令后立即执行切换过程，即终端设备断开源小区并与目标小区连接(如执行随机接入，发送无线资源控制(Radio Resource Control，RRC)切换完成消息给目标基站等)；序列号(Sequence Number，SN)状态转移，数据转发。
(3)切换完成：目标基站与接入和移动性管理功能(Access and Mobility Management Function，AMF)和用户端口功能(User Port Function，UPF)执行路径切换(Path Switch)，释放源基站的终端设备上下文。
在图2中，切换流程可以包括以下步骤1至步骤12。
在步骤1之前，终端设备与与源基站交互用户数据，源基站与UPF(s)交互用户数据。在步骤1之前，还可以存在步骤0：通过AMF提供移动控制信息。
在本申请任一实施例中，源基站可以为源小区对应的基站或者源小区对应的网络设备，目标基站可以为目标小区对应的基站或者目标小区对应的网络设备。
步骤1：测量控制和报告，源基站对终端设备进行测量配置，终端设备的测量结果将用于辅助源基站进行切换判决；接着终端设备根据测量配置，进行测量上报。
步骤2：切换确定，源基站参考终端设备的测量上报结果，根据自身的切换算法，进行切换判决。
步骤3：源基站向目标基站发送切换请求，源基站向目标基站发送切换请求消息，该消息包含切换准备的相关信息，主要有终端设备的X2和S1信令上下文参考、目标小区标识、密钥、RRC上下文、接入层(Access Stratum，AS)配置、演进通用陆地无线接入网络(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)无线接入承载(E-UTRAN Radio Access Bearer，E-RAB)上下文等。同时也包含源小区物理层标识和消息鉴权验证码，用于可能的切换失败后的恢复过程。终端设备的X2和S1信令上下文参考可以帮助目标基站找到源基站的位置。E-RAB上下文包括必要的无线网络层(Radio Network Layer，RLN)和传输层(Transport Network Layrer，TNL)、寻址信息以及E-RAB的服务质量(Quality of Service，QoS)信息等。切换准备信息有一部分是包含于接口消息本身的(例如目标小区标识)，另一部分存在于接口消息的RRC容器(RRC container)中(例如RRC上下文)。
步骤4：准入控制，目标基站根据收到的E-RAB QoS信息进行接纳控制，以提高切换的成功率。接纳控制要考虑预留相应的资源、小区无线网络临时标识(Cell Radio Network Temporary Identity，C-RNTI)以及分配专用随机接入前导(Preamble)码等。目标小区所使用的AS配置可以是完全独立于源小区的完全配置，也可以是在源小区基础之上的增量配置(增量配置是指对相同的部分不进行配置，只通过信令重配不同的部分，终端设备对于没有收到的配置，将继续使用原配置)。
步骤5：目标基站向源基站发送切换请求确认，目标基站进行切换准备，同时向源基站发送切换请求的肯定确认(Acknowledgement，ACK)消息。该消息中包含一个RRC container，具体内容是触发终端设备进行切换的切换命令。源基站切换命令采用透传的方式(不做任何修改)，发送给终端设备。切换命令中包含新的C-RNTI、目标基站的案例算法标识，有可能还携带随机接入专用Preamble码、接入参数、系统信息等。如果有必要，切换请求ACK消息中还有可能携带无线网络层 (Radio Network Layer，RNL)/传输网络层(Transport Network Layer，TNL)信息，用于数据前转。当源基站收到切换请求ACK消息或者是向终端设备转发了切换命令之后，就可以开始数据前转了。
步骤6：RAN切换启动，6的步骤为源基站向终端设备发送切换命令，切换命令(携带了移动性控制信息的RRC连接重配置消息)是由目标基站生成的，通过源基站将其透传给终端设备。当终端设备收到该消息之后，就会利用该消息中的相关参数发起切换过程。终端设备不需要等待低层向源基站发送的混合自动重传请求(Hybrid Automatic Repeat reQuest，HARQ)/自动重传请求(Automatic Repeat reQuest，ARQ)响应，就可以发起切换过程。
在步骤6之后，终端设备离开源基站并同步至目标基站。
步骤7：源基站向目标基站进行SN传递，也可以为SN状态传输，源基站发送序列号(SN，Seq终端设备nce Number)状态传输消息到目标基站，传送E-RAB(仅那些需要保留分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)状态的E-RAB需要执行SN状态的转发，对应于无线链路控制(Radio Link Control，RLC)应答模式(Acknowledged Mode，AM)模式)的上行PDCP SN接收状态和下行PDCP SN发送状态。
在步骤7之后，源基站从UPF提供缓冲数据和新数据。接着，UPF可以将接下来要给终端设备传输的用户数据先发送给源基站，源基站再将用户数据转发给目标基站，目标基站可以从源基站缓冲用户数据。
步骤8：RAN切换完成，在8中，终端设备收到切换命令以后，执行与目标小区的同步，如果在切换命令中配置了随机接入专用Preamble码，则使用非竞争随机接入流程接入目标小区，如果没有配置专用Preamble码，则使用竞争随机接入流程接入目标小区。
在步骤8之后，终端设备将通过目标基站与UPF传输用户数据。
步骤9：目标基站向AMF发送路径切换请求，目标基站通过路径转换请求消息使AMF得知终端设备更换了小区。此时空口的切换已经成功完成。
步骤10：UPF中的路径切换，可以通过以下步骤来实现：AMF向UPF发送用户平面更新请求，UPF转换下行数据路径，UPF向AMF发送用户平面更新响应。
为了辅助在目标基站的重排功能，UPF在路径切换以后，立即在旧路径发送一个或者多个“结束标记(End Marker)包”。“End Marker包”内不含用户数据，由GPRS隧道协议(GPRS Tunneling Protocol，GTP)头指示。在完成发送含有标志符的包以后，UPF不应该在旧路径发送任何数据包。在收到“End Marker包”以后，如果前转对这个承载是激活的，源基站应该将此包发送给目标基站。在察觉了“End Marker包”以后，目标基站应该丢弃“End Marker包”并发起任何必要的流程来维持用户的按序递交，从而用户数据在UPF与目标基站之间传输。
步骤11：AMF向目标基站发送路径切换请求确认，完成了路径转换过程。
步骤12：目标基站向源基站发送终端设备上下文释放，源基站接收目标基站发送的终端设备上下文释放，释放终端设备上下文。
为了减小切换带来的时延，NR R18支持基于层1/层2(L1/L2)的切换，基于L1/L2的切换主要针对集中式单元内(intra-Central unit，intra-CU)切换场景，在集中式单元(Central unit，CU)的PDCP和/或密钥不变的情况下基于层一或者层二信令的进行切换。
LTE R14引入了无随机接入信道(Random Access Channel-less，RACH-less)切换，终端设备的时间提前(Timing Advance，TA)为0或者与源小区的TA值相同，终端设备在收到切换命令后，可以直接向目标基站进行上行的传输。对于RACH-less切换，终端设备切换完成的判断条件是收到目标小区发送的终端设备的竞争解决标识(contention resolution identity)媒体访问控制控制单元(Media Access Control Control Element，MAC CE)。
在本申请任一实施例中，时间提前也可以称为时间提前量、定时提前或定时提前量。在本申请任一实施例中，RACH-less可以与RACH less作同一理解。
对于L1/L2的切换，减少UE上行同步的时延是L1/L2移动性的主要优化方向之一，其中一种方式就是提前获取UE在目标小区的TA。也就是说，当切换触发时，UE无需再次执行用于获取TA的随机接入流程，而是基于已获取的TA执行与目标小区的交互即可。
对于提前获取TA而言，潜在的一个问题就是当UE真正执行切换的时候，TA可能由于UE的移动而不再有效，或者，网络在切换命中指示的波束对应的链路质量不能满足传输需求，那么UE只能一直尝试上行传输直到T304超时，认为切换失败。
为了避免上述切换失败而导致的RRC连接重建立，本申请提供了一种可以回退到传统随机接入的方法，避免了不必要的重建流程。
为便于理解本申请实施例的技术方案，以下通过具体实施例详述本申请的技术方案。以上相关技术作为可选方案与本申请实施例的技术方案可以进行任意结合，其均属于本申请实施例的保护范围。本申请实施例包括以下内容中的至少部分内容。
图3为本申请实施例提供的一种通信方法的流程示意图，如图3所示，该方法包括：
S301、终端设备确定目标小区或第一信息；其中，所述第一信息用于指示目标小区。
S302、所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
可选地，终端设备可以根据至少一个候选小区的测量结果，确定目标小区或第一信息。可选地，终端设备可以对至少一个候选小区进行测量，得到至少一个候选小区的测量结果。可选地，至少一个候选小区的测量结果可以包括在测量报告中。
可选地，终端设备可以接收(源)网络设备发送的目标小区的标识或第一信息。
可选地，第一信息中可以包括或指示目标小区的标识。可选地，第一信息还可以包括或指示用于接入/或切换到目标小区的信息。可选地，在第一信息是(源)网络设备向终端设备发送的情况下，第一信息可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。
可选地，所述终端设备通过随机接入流程接入所述目标小区，可以包括终端设备可以基于目标小区的随机接入信息，通过随机接入流程接入所述目标小区。可选地，随机接入信息可以包括以下至少之一：随机接入前导(Preamble)、随机接入的资源、TA值。
可选地，在本申请任一实施例中，TA值可以包括上行TA值或下行TA值。
可选地，目标小区的随机接入信息可以是终端设备确定的，或者，可以是网络设备确定的，并向终端设备发送的。可选地，目标小区的随机接入信息可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。
可选地，所述终端设备触发连接重建立流程，可以包括：终端设备向特定网络设备发送连接重建立请求。可选地，在一些实施例中，终端设备可以接收特定网络设备发送的连接重建立消息，终端设备可以向特定网络设备发送连接重建立完成消息。可选地，在另一些实施例中，终端设备可以接收特定网络设备发送的连接重建立拒绝消息。可选地，特定网络设备对应的小区可以是终端设备能够搜索到的任一个小区。例如，特定网络设备可以包括以下任一个网络设备：源小区对应的源网络设备、目标小区对应的目标网络设备、第一候选小区对应的网络设备、至少一个候选小区对应的网络设备、至少一个候选小区之外的小区对应的网络设备。
可选地，所述终端设备可以自身确定第一候选小区，并向所述第一候选小区执行切换。可选地，终端设备可以根据至少一个候选小区的测量结果，确定第一候选小区。可选地，终端设备可以从至少一个候选小区中确定第一候选小区。
可选地，第一信息或切换命令中可以包括第一候选小区。可选地，第一候选小区、目标小区、源小区中的至少两个小区的TA值可以相同或不同。
可选地，向所述第一候选小区执行切换，可以包括：获取第一候选小区的TA值，根据第一候选小区的TA值，向所述第一候选小区执行切换，或者，可以包括：发起随机接入流程，接入所述第一候选小区。
可选地，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换，可以包括：终端设备根据以下至少之一：目标小区的小区信息、目标小区的接入信息、用于接入/或切换到目标小区的信息，触发连接重建立流程，或者确定第一候选小区，并向所述第一候选小区执行切换。
可选地，在终端设备确定不能接入到目标小区的情况下，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。可选地，终端设备确定不能接入到目标小区，可以包括：终端设备根据预先获得的或者源网络设备发送的用于接入/或切换到目标小区的信息，确定不能接入到目标小区。
可选地，终端设备可以在确定到第一候选小区的情况下，可以通过第一候选小区的TA值，接入第一候选小区。
可选地，终端设备可以在确定到第一候选小区的情况下，可以通过随机接入流程接入所述第一候选小区。可选地，所述终端设备通过随机接入流程接入所述第一候选小区，可以包括：终端设备可以基于第一候选小区的随机接入信息，通过随机接入流程接入所述第一候选小区。可选地，随机接入信息可以包括以下至少之一：随机接入前导(Preamble)、随机接入的资源、TA值。
可选地，目标小区的随机接入信息和/或第一候选小区的随机接入信息，可以是终端设备预先配置的，或者可以是源网络设备向终端设备配置/激活的，或者，可以是协议约定的。示例性地，目标小区的随机接入信息和/或第一候选小区的随机接入信息，可以包括在指示至少一个候选小区的信令/配置中，或者可以包括在切换命令中。可选地，目标小区的随机接入资源和/或第一候选小区的随机接入资源可以为配置授权(Configured，grant，CG)资源或动态授权(Dynamic，grant，DG)资源。
可选地，在所述终端设备通过随机接入流程接入所述目标小区失败的情况下，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
可选地，在所述终端设备触发连接重建立流程失败的情况下，所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
可选地，在所述终端设备通过随机接入流程接入所述目标小区失败的情况下，所述终端设备触发连接重建立流程，在所述终端设备触发连接重建立流程失败的情况下，所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
在本申请实施例中，终端设备确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。这样，终端设备可以通过随机接入流程接入目标小区，或者，可以通过连接重建立流程接入任一小区，或者可以接入至第一候选小区，从而使得终端设备能够在目标小区或第一候选小区通信，提高了信息传输的可靠性。
在一些实施例中，所述终端设备通过随机接入流程接入所述目标小区，包括：在第一时长内，所述终端设备未接入到所述目标小区的情况下，所述终端设备通过随机接入流程接入所述目标小区。
可选地，所述终端设备通过随机接入流程接入所述目标小区，所对应的终端设备未接入到所述目标小区，可以包括：终端设备根据随机接入流程之外的其它一种或多种接入方式，未接入到所述目标小区。可选地，随机接入流程之外的其它一种或多种接入方式，可以包括以下至少之一：终端设备直接接入至目标小区(可以对应RACH-less切换)，终端设备根据获得的目标小区的TA值，接入至目标小区(可以对应L1/L2的切换)。
可选地，在本申请任一实施例中，接入可以包括终端设备基于获取的资源进行上行传输或者监听该下行消息。例如，接入目标小区可以包括：终端设备基于获取的资源向目标网络设备发送上行消息(例如第二信息)，或者监听目标网络设备发送的下行消息(例如PDCCH或PDSCH)。又例如，接入特定小区(即特定网络设备对应的小区)/第一候选小区可以包括：终端设备基于获取的资源向特定网络设备/第一候选小区对应的网络设备发送上行消息，或者监听特定网络设备/第一候选小区对应的网络设备发送的下行消息。
可选地，第一时长可以小于定时器T304的时长。可选地，第一时长的开始时间可以与定时器T304的启动时间相同。可选地，第一时长可以根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。可选地，第一时长可以是源网络设备通过RRC信令配置的。
可选地，第一时长可以为定时器T304。这样，在定时器T304超时的情况下，终端设备可以执行通过随机接入流程接入所述目标小区的步骤。
在一些实施例中，所述随机接入流程包括四步随机接入流程或两步随机接入流程。
在一些实施例中，所述终端设备未接入到所述目标小区，包括：所述终端设备向目标网络设备发送第二信息后，未接收到所述目标网络设备发送的第三信息。
可选地，终端设备可以在具有可用的上行资源的情况下，通过上行资源发送第二信息。可选地，可用的上行资源可以是源网络设备为终端设备预配置的，比如上行资源的指示可以包括在用于向终端设备指示至少一个候选小区的信令/配置中，或者可用的上行资源可以是源网络设备向终端设备直接指示或激活(例如，激活预配置的资源)的，比如上行资源的指示可以包括在切换命令中，或者可用的上行资源可以是协议约定的。可选地，本申请任一实施例中的上行资源可以为配置授权CG资源或动态授权DG资源。
在另一些实施例中，所述终端设备未接入到所述目标小区，包括：所述终端设备没有监听到目标网络设备发送的物理下行控制信道PDCCH或物理下行共享信道PDSCH。
可选地，终端设备可以在下行资源上接收第二信息、PDCCH或PDSCH。可选地，下行资源可以是终端设备预配置的，或者可以是源网络设备向终端设备配置的，或者可以是协议约定的。
可选地，终端设备在无可用的上行资源的情况下，监听所述目标小区的下行控制信道PDCCH或PDSCH。
可选地，PDCCH用于调度或激活上行资源和/或下行资源。
在一些实施例中，所述第二信息包括以下至少之一：
重配置完成消息、切换执行/完成媒体接入控制控制单元MAC CE、小区无线网络临时标识C-RNTI MAC CE、缓存状态报告BSR、数据消息、调度请求SR。
在一些实施例中，所述第三信息包括以下至少之一：所述终端设备的竞争解决标识MAC CE、下行信息。
可选地，本申请任一实施例中的下行信息可以包括以下至少之一：下行数据信息、PDCCH、PDSCH、下行控制信息(Downlink Control Information，DCI)、下行MAC CE。
在一些实施例中，所述终端设备通过随机接入流程接入所述目标小区，包括：
所述终端设备向所述目标网络设备发送Msg3/MsgA；其中，在传输所送Msg3/MsgA载荷的授权大小，大于或等于所述上行媒体访问控制MAC协议数据单元PDU的情况下，通过Msg3/MsgA向所述目标网络设备发送所述上行MAC PDU。
在一些实施例中，所述终端设备通过随机接入流程接入所述目标小区，包括：
所述终端设备向所述目标网络设备发送Msg3/MsgA；其中，在传输Msg3/MsgA载荷的授权大小，小于所述上行MAC PDU的情况下，从所述上行MAC PDU中确定所述部分或全部MAC服务数据单元SDU和/或部分或全部MAC CE，并通过Msg3/MsgA向所述目标网络设备发送所述部分或全部MAC SDU和/或部分或全部MAC CE。
可选地，上行MAC PDU、MAC SDU、MAC CE中的至少之一，可以对应第二信息中的全部或部分。
在一些实施例中，所述方法还包括：所述终端设备确定所述目标小区的定时提前TA值；所述终端设备通过随机接入流程接入所述目标小区，包括：所述终端设备从确定到所述目标小区的TA值开始的第二时长后，通过随机接入流程接入所述目标小区。
可选地，所述终端设备确定所述目标小区的定时提前TA值，可以是在所述终端设备确定目标小区或第一信息之前确定的，或之后确定的，或同时确定的。示例性地，在一些场景中，所述终端设备确定所述目标小区的定时提前TA值，可以是在所述终端设备确定目标小区或第一信息之前确定的。
可选地，终端设备可以自行确定目标小区的TA值，或者终端设备可以接收源网络设备发送的目标小区的TA值。可选地，终端设备可以先确定目标小区的TA值，然后再确定目标小区或第一信息，从而根据目标小区的TA值接入目标小区。可选地，终端设备可以先确定至少一个候选小区的TA值，至少一个候选小区包括目标小区，然后终端设备可以确定目标小区或第一信息，从而根据目标小区的TA值接入目标小区。
可选地，第二时长可以是根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。可选地，第二时长的起始时刻可以为确定到所述目标小区的TA值的时刻，或者可以是根据确定到所述目标小区的TA值的时刻而确定的。可选地，第二时长可以是源网络设备通过RRC信令配置的。
可选地，第二时长可以大于特定时长，其中，特定时长可以为终端设备确定目标小区的TA值的时刻，与终端设备确定目标小区或第一信息的时刻之间的时长。
在一些实施例中，所述终端设备从确定到所述目标小区的TA值开始的第二时长后，通过随机接入流程接入所述目标小区，包括：在所述终端设备从确定到所述目标小区的TA值开始的所述第二时长内，所述终端设备根据所述目标小区的TA值，未接入到所述目标小区的情况下，所述终端设备在所述第二时长后，通过随机接入流程接入所述目标小区。
在一些实施例中，所述终端设备确定所述目标小区的定时提前TA值，可以包括：所述终端设备接收源网络设备发送的所述目标小区的TA值。
可选地，目标小区的TA值可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。可选地，源网络设备可以确定源网络设备与终端设备的TA值，并获取源小区与目标小区的TA差值，根据源网络设备与终端设备的TA值以及TA差值，确定目标小区的TA值。
在另一些实施例中，所述终端设备确定所述目标小区的定时提前TA值，可以包括：所述终端设备向源网络设备发送上行参考信号，接收所述源网络设备发送的所述目标小区的TA值。
可选地，上行参考信号可以包括以下至少之一：探测参考信号(Sounding Reference Signal，SRS)、解调参考信号(DeModulation Reference Signal，DMRS)、相位跟踪参考信号(Phase Tracking Reference  Signal，PTRS)。
可选地，源网络设备可以向终端设备发送上行参考信号的配置信息，终端设备可以根据上行参考信号的配置信息，向源网络设备发送上行参考信号。可选地，源网络设备可以根据终端设备发送的上行参考信号，确定源网络设备与终端设备的TA值，进而源网络设备根据源网络设备与终端设备的TA值以及TA差值，确定目标小区的TA值。可选地，上行参考信号的配置信息可以包括用于发送上行参考信号的资源。
在又一些实施例中，所述终端设备确定所述目标小区的定时提前TA值，可以包括：所述终端设备根据所述目标小区的第一测量结果，确定所述目标小区的TA值。
可选地，终端设备可以接收源网络设备发送的至少一个候选小区，从而终端设备可以对至少一个候选小区进行测量，得到至少一个候选小区的测量结果，其中，由于至少一个候选小区包括目标小区，从而终端设备能够得到目标小区的第一测量结果。可选地，至少一个候选小区的测量结果可以包括在测量报告中。
可选地，终端设备根据配置信息对至少一个候选小区进行测量，得到至少一个候选小区的测量结果，至少一个候选小区可以包括源小区和目标小区，终端设备可以根据至少一个候选小区的测量结果确定是否需要切换到目标小区。在这种情况下，终端可以在确定需要切换的目标小区之前，得到目标小区的第一测量结果，进而可以确定目标小区的TA值。
可选地，在本申请任一实施例中，测量结果可以包括以下至少之一：参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(Reference Signal Received Quality，RSRQ)、接收信号强度指示(Received Signal Strength Indicator，RSSI)、信号与干扰加噪声比(Signal to Interferenceand Noise Ratio，SINR)。
在再一些实施例中，所述终端设备确定所述目标小区的定时提前TA值，可以包括：所述终端设备根据源小区的TA值、所述源小区和所述目标小区的TA差值，确定所述目标小区的TA值。
可选地，终端设备可以接收源网络设备发送的所述源小区和所述目标小区的TA差值。可选地，源小区的TA值和/或所述源小区和所述目标小区的TA差值可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。
在再一些实施例中，所述终端设备确定所述目标小区的定时提前TA值，可以包括：所述终端设备通过随机接入流程，确定所述目标小区的TA值。这样，在一种实施方式中，终端设备确定目标小区或第一信息之前，终端设备可以通过随机接入流程确定目标小区的TA值，在所述终端设备根据目标小区的TA值，未接入到所述目标小区的情况下，终端设备可以通过随机接入流程确定目标小区的新TA值，通过新的TA值接入目标小区。
可选地，可以通过PDCCH命令(PDCCH order)触发或者通过DCI触发随机接入流程，以使终端设备确定目标小区的TA值。示例性地，源网络设备可以向终端设备发送PDCCH order或DCI，终端设备根据PDCCH order或DCI，发起随机接入流程，从而得到目标小区的TA值。
在一些实施例中，所述方法还包括：
在所述终端设备确定目标小区或第一信息之前，所述终端设备确定所述目标小区的第一测量结果；其中，确定所述目标小区的第一测量结果的时间，与确定所述目标小区的TA值的时间对应；
在所述终端设备接收到源网络设备发送的切换命令或者在所述终端设备需要执行切换的情况下，所述终端设备确定所述目标小区的第二测量结果；
所述终端设备通过随机接入流程接入所述目标小区，包括：
在所述第一测量结果与所述第二测量结果的差值的绝对值大于第一阈值的情况下，所述终端设备通过随机接入流程接入所述目标小区。
可选地，目标小区的第一测量结果可以为测量报告的测量结果。可选地，目标小区的第一测量结果可以是在终端设备确定需要切换到目标小区之前确定的。
可选地，确定所述目标小区的第一测量结果的时间，可以与确定所述目标小区的TA值的时间相同，或者间隔一个或多个时间单元。可选地，一个时间单元可以包括以下至少之一或者可以由以下至少之一组成：一个或多个帧、一个或多个子帧、一个或多个时隙、一个或多个符号。可选地，确定所述目标小区的第一测量结果的时间，可以在确定所述目标小区的TA值的时间之前确定的，或之后确定的，或同时确定的。
在所述终端设备接收到源网络设备发送的切换命令或者在所述终端设备需要执行切换的情况下，终端设备可以确定需要切换至目标小区。
在相关技术中，在所述终端设备接收到源网络设备发送的切换命令或者在所述终端设备需要执 行切换的情况下，终端设备可以根据目标小区的TA值，直接向目标网络设备发送消息。但是本申请实施例中，在所述终端设备接收到源网络设备发送的切换命令或者在所述终端设备需要执行切换的情况下，所述终端设备重新确定所述目标小区的第二测量结果，根据第一测量结果和第二测量结果，确定终端设备接入目标小区的方式。
示例性地，在所述第一测量结果与所述第二测量结果的差值的绝对值大于第一阈值的情况下，所述终端设备通过随机接入流程接入所述目标小区。
在本申请实施例中，由于所述第一测量结果与所述第二测量结果的差值的绝对值大于第一阈值，从而终端设备确定目标小区的TA值不满足接入要求，这时，终端设备可以通过随机接入流程确定目标小区的新TA值，根据目标小区的新TA值接入目标小区，从而避免了而通过目标小区的TA值无法接入到目标小区而导致传输可靠性降低的情况。
可选地，在本申请任一实施例中，目标小区的TA值可以称为目标小区的旧TA值或者目标小区的第一TA值，目标小区的新TA值可以称为目标小区的第二TA值。
在一些实施例中，所述方法还包括：
在所述第一测量结果与所述第二测量结果的差值的绝对值小于或等于所述第一阈值的情况下，所述终端设备向所述目标小区执行切换。
这样，在所述第一测量结果与所述第二测量结果的差值的绝对值小于或等于所述第一阈值的情况下，终端设备可以根据所述目标小区的TA值，向目标小区执行切换，或者说可以根据所述目标小区的TA值，接入目标小区。
可选地，第一阈值可以根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。
在本申请实施例中，由于所述第一测量结果与所述第二测量结果的差值的绝对值小于或等于所述第一阈值，从而终端设备确定目标小区的TA值满足接入要求，这时，可以根据所述目标小区的TA值，向目标小区执行切换。
在一些实施例中，所述终端设备通过随机接入流程接入所述目标小区，包括：
在所述终端设备确定所述目标小区的波束信息的测量结果小于或等于第二阈值的情况下，所述终端设备通过随机接入流程接入所述目标小区；其中，所述目标小区的波束信息通过所述第一信息指示。
在另一些实施例中，所述终端设备通过随机接入流程接入所述目标小区，包括：在所述终端设备确定所述目标小区的波束信息中，不存在测量结果大于第二阈值的波束信息的情况下，所述终端设备通过随机接入流程接入所述目标小区。
可选地，波束信息可以包括参考信号和/或参考信号的资源信息。
可选地，在本申请任一实施例中，波束信息可以替换为参考信号或下行参考信号，即目标小区的波束信息可以替换为目标小区的下行参考信号，或者，在本申请任一实施例中，波束信息可以对应空域滤波器(spatial domain filter)，例如，发送波束可以与空域发送滤波器(spatial domain transmission filter)对应，接收波束可以与空域接收滤波器(spatial domain receive filter)对应。
可选地，下行参考信号可以包括以下至少之一：同步信号块(Synchronization Signal Block，SSB)、信道状态信息参考信号(Channel State Information-Reference Signal，CSI-RS)。其中，SSB也可以称为同步信号/物理广播信道块(Synchronization Signal/Physical Broadcast Channel Block，SS/PBCH block)。
可选地，目标小区的波束信息可以根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。可选地，目标小区的波束信息可以包括在第一信息中，或者可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。
可选地，第二阈值可以根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。
这样，由于所述目标小区的波束信息的测量结果小于或等于第二阈值，或者由于所述目标小区的波束信息中，不存在测量结果大于第二阈值的波束信息，从而终端设备确定目标小区的TA值不满足接入要求，这时，终端设备可以通过随机接入流程确定目标小区的新TA值，根据目标小区的新TA值接入目标小区。
在一些实施例中，所述方法还包括：在所述终端设备确定所述目标小区的波束信息的测量结果大于所述第二阈值的情况下，所述终端设备向所述目标小区执行切换。
在另一些实施例中，所述方法还包括：在所述终端设备确定所述目标小区的波束信息中，存在测量结果大于所述第二阈值的波束信息的情况下，所述终端设备向所述目标小区执行切换。
这样，由于所述目标小区的波束信息的测量结果大于所述第二阈值，或者由于所述目标小区的波束信息中，存在测量结果大于所述第二阈值的波束信息，从而终端设备确定目标小区的TA值满足接入要求，这时，可以根据所述目标小区的TA值，向目标小区执行切换。
在一些实施例中，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换，包括：在第三时长内，所述终端设备未接入到所述目标小区的情况下，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
可选地，第三时长可以根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。可选地，第三时长对应的定时器可以为定时器T304。可选地，第三时长的起始时刻，可以与第一时刻对应的起始时刻相同或不同。可选地，第三时长可以是源网络设备通过RRC信令配置的。
可选地，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换，所对应的所述终端设备未接入到所述目标小区，可以包括：终端设备根据随机接入流程之外的其它一种或多种接入方式，未接入到所述目标小区，或者可以包括：终端设备根据随机接入流程，未接入到所述目标小区，或者可以包括：终端设备根据随机接入流程之外的其它一种或多种接入方式，以及随机接入流程，未接入到所述目标小区。
可选地，在所述终端设备触发连接重建立流程的情况下，终端设备可以向特定网络设备发送重建立流程的原因。
可选地，第一候选小区可以为目标小区之外的候选小区。可选地，第一候选小区可以为目标小区或目标小区之外的小区。
可选地，终端设备可以确定第一候选小区的TA值，根据第一候选小区的TA值，向所述第一候选小区执行切换，或者说接入到第一候选小区。
可选地，终端设备可以根据在确定第一候选小区之前得到的第一候选小区的TA值，向所述第一候选小区执行切换。可选地，终端设备可以根据在确定第一候选小区之后得到的第一候选小区的新TA值(例如，通过随机接入流程得到的新TA值)，向所述第一候选小区执行切换。可选地，终端设备可以根据源网络设备发送的第一候选小区的TA值，向所述第一候选小区执行切换；其中，源网络设备发送的第一候选小区的TA值可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。
示例性地，终端设备在所述终端设备确定第一候选小区之前，所述终端设备确定所述第一候选小区的第三测量结果，其中，确定所述第一候选小区的第三测量结果的时间，与确定所述第一候选小区的TA值的时间对应；在所述终端设备接收到源网络设备发送的切换命令或者在所述终端设备需要执行切换的情况下，所述终端设备确定所述第一候选小区的第四测量结果；在所述第三测量结果与所述第四测量结果的差值的绝对值大于第一阈值的情况下，所述终端设备通过随机接入流程接入所述第一候选小区。在所述第三测量结果与所述第四测量结果的差值的绝对值小于或等于所述第一阈值的情况下，所述终端设备根据第一候选小区的TA值，向所述第一候选小区执行切换。
示例性地，在所述终端设备确定所述第一候选小区的波束信息的测量结果小于或等于第二阈值的情况下，所述终端设备通过随机接入流程接入所述第一候选小区；其中，所述第一候选小区的波束信息通过所述第一信息指示；或者，在所述终端设备确定所述第一候选小区的波束信息中，不存在测量结果大于第二阈值的波束信息的情况下，所述终端设备通过随机接入流程接入所述第一候选小区。
示例性地，在所述终端设备确定所述第一候选小区的波束信息的测量结果大于所述第二阈值的情况下，所述终端设备向所述第一候选小区执行切换；或者，在所述终端设备确定所述第一候选小区的波束信息中，存在测量结果大于所述第二阈值的波束信息的情况下，所述终端设备向所述第一候选小区执行切换。
在一些实施例中，所述第三时长大于所述终端设备通过随机接入流程接入所述目标小区对应的第一时长。
在一些实施方式中，在第一时长内，终端设备通过目标小区的TA，或者根据RACH-less接入目标小区失败的情况下，终端设备可以通过随机接入流程接入目标小区，在第三时长内，终端设备通过随机接入流程接入目标小区失败的情况下，终端设备触发连接重建立流程，或者确定第一候选小 区，并向所述第一候选小区执行切换。
在一些实施例中，所述第一时长和/或第三时长对应的定时器的开启时刻，根据所述终端设备确定到所述目标小区的时刻确定。
可选地，所述第一时长和/或第三时长对应的定时器的开启时刻，可以为终端设备确定到所述目标小区的时刻。可选地，所述第一时长和/或第三时长对应的定时器的开启时刻，可以与终端设备确定到所述目标小区的时刻间隔一个或多个时间单元。可选地，所述第一时长和/或第三时长对应的定时器的开启时刻，可以在终端设备确定到所述目标小区的时刻之前或之后，或者，所述第一时长和/或第三时长对应的定时器的开启时刻，可以与终端设备确定到所述目标小区的时刻相同。
在一些实施例中，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换，包括：在所述终端设备确定所述目标小区的波束信息的测量值小于第三阈值的情况下，触发连接重建立流程，或者确定第一候选小区，并向所述第一候选小区执行切换。
可选地，第三阈值可以根据终端设备的预配置信息确定，或者可以是网络设备向终端设备配置的，或者可以是协议约定的。
可选地，向所述第一候选小区执行切换，可以包括，向第一候选小区对应的网络设备发送数据信息或接入请求，数据信息或接入请求可以携带源小区的标识和/或目标小区的标识。这样，第一候选小区对应的网络设备可以根据终端设备发送的源小区的标识和/或目标小区的标识，从源网络设备或目标网络设备接收终端设备的上下文。
在一些实施例中，所述确定第一候选小区，包括：
根据对至少一个候选小区的测量结果，确定所述第一候选小区；其中，所述至少一个候选小区是源网络设备向所述终端设备指示的。
可选地，第一候选小区可以为：至少一个候选小区的测量结果中最高测量结果对应的候选小区。可选地，第一候选小区可以为：至少一个候选小区中目标小区之外的小区的测量结果中，最高测量结果对应的候选小区。
在一些实施例中，所述终端设备确定目标小区或第一信息，包括：所述终端设备接收源网络设备发送的切换命令，所述切换命令中携带所述目标小区的标识或所述第一信息。
在另一些实施例中，所述终端设备确定目标小区或第一信息，包括：所述终端设备根据对至少一个候选小区的测量结果，确定所述目标小区或所述第一信息；其中，所述至少一个候选小区是源网络设备向所述终端设备指示的。
在一些实施例中，所述第一信息包括以下至少之一：
所述目标小区的索引或标识；
所述目标小区的TA值；
源小区和所述目标小区的TA差值；
所述目标小区的波束信息；
所述目标小区向所述终端设备配置的资源信息；
所述目标小区的C-RNTI；
无随机接入信道RACH-less切换类型指示；
L1/L2切换类型指示。
可选地，源小区和所述目标小区的TA差值在另一些实施例中也可以称为TA调整值。
可选地，波束信息可以包括以下至少之一：传输配置指示(Transmission Configuration Indication，TCI)状态(TCI state)、SSB索引(SSB index)、CSI-RS索引(CSI-RS index)。
可选地，所述目标小区向所述终端设备配置的资源信息可以包括授CG资源或DG资源。
可选地，终端设备在接收到的切换命令中携带L1/L2切换类型指示的情况下，终端设备执行的是L1/L2切换。可选地，终端设备在接收到的切换命令中携带RACH-less切换类型指示的情况下，终端设备执行的是RACH-less切换。
在一些实施例中，所述方法还包括：在所述终端设备向第一候选小区切换成功的情况下，存储/生成第一报告。
在另一些实施例中，所述方法还包括：在所述终端设备向所述目标小区随机接入成功的情况下，存储/生成第二报告。
可选地，第一报告和/或第二报告中可以包括以下至少之一：终端设备在确定目标小区前对至少一个候选小区进行测量得到的测量结果、终端设备在确定目标小区后对至少一个候选小区进行测量 得到的测量结果、目标小区的第一测量结果、目标小区的第二测量结果、目标小区的波束信息、切换命令中指示的目标小区、终端设备根据测量报告确定的目标小区、所述目标小区的TA值、所述目标小区的新TA值、第一候选小区的标识。
在一些实施例中，所述方法还包括以下之一：
所述终端设备向所述第一候选小区对应的网络设备发送所述第一报告；
所述终端设备向目标网络设备发送所述第二报告；
所述终端设备接收所述第一候选小区对应的网络设备发送的第一上报请求，所述终端设备向所述第一候选小区对应的网络设备发送所述第一报告；
所述终端设备接收目标网络设备发送的第二上报请求，所述终端设备向所述目标网络设备发送所述第二报告；
所述终端设备向所述第一候选小区对应的网络设备发送用于指示存储有所述第一报告的指示信息，所述终端设备接收所述第一候选小区对应的网络设备发送的第一上报请求，所述终端设备向所述第一候选小区对应的网络设备发送所述第一报告；
所述终端设备向目标网络设备发送用于指示存储有所述第二报告的指示信息，所述终端设备接收所述目标网络设备发送的第二上报请求，所述终端设备向所送目标网络设备发送所述第二报告。
可选地，终端设备在每得到一次第一报告或第二报告的情况下，可以向第一候选小区对应的网络设备或目标网络设备上报第一报告或第二报告。
可选地，在终端设备接入第一候选小区成功的情况下，所述第一候选小区对应的网络设备可以向终端设备发送第一上报请求，或者，终端设备向所述第一候选小区对应的网络设备发送用于指示存储有所述第一报告的指示信息。
可选地，在终端设备接入目标小区成功的情况下，所述目标网络设备可以向终端设备发送第二上报请求，或者，终端设备向所述目标网络设备发送用于指示存储有所述第二报告的指示信息。
可选地，在第一候选小区对应的网络设备得到第一报告的情况下，第一候选小区对应的网络设备可以根据第一报告对内部存储的AI模型进行训练或优化。可选地，在目标网络设备得到第二报告的情况下，目标网络设备可以根据第二报告对内部存储的AI模型进行训练或优化。
在一些实施例中，所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换之前，所述方法还包括：
所述终端设备向所述目标小区执行L1/L2切换；或者，
所述终端设备向所述目标小区执行RACH less切换。
可选地，所述终端设备向所述目标小区执行L1/L2切换，可以包括：终端设备根据目标小区的TA值，向所述目标小区执行L1/L2切换。
可选地，所述终端设备向所述目标小区执行RACH less切换，可以包括：终端设备根据目标小区的TA值为0，向所述目标小区执行RACH less切换，或者，终端设备可以根据源小区的TA值，向所述目标小区执行RACH less切换。
图4为本申请实施例提供的另一种通信方法的流程示意图，如图4所示，该方法包括：
S401、源网络设备向终端设备发送目标小区的标识或第一信息；其中，所述第一信息用于指示目标小区；
所述目标小区的标识或所述第一信息，用于所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
可选地，目标小区的标识或第一信息可以包括在切换命令中，或者可以包括在重配置消息中，或者可以包括在重配置消息中的其它信令中。
在一些实施例中，所述第一信息包括以下至少之一：
所述目标小区的索引或标识；
所述目标小区的TA值；
所述源小区和所述目标小区的TA差值；
所述目标小区的波束信息；
所述目标小区向所述终端设备配置的资源信息；
所述目标小区的C-RNTI；
无随机接入信道RACH-less切换类型指示；
L1/L2切换类型指示。
在一些实施例中，UE确定目标小区和/或第一信息，并基于第一信息向目标小区发起切换流程。
可选地，UE向目标小区发起切换流程包括以下(a)-(d)中的至少之一(对于网络触发的切换而言，这里指的是收到切换命令的行为)：
(a)UE向目标网络设备发送第一上行消息(对应上述实施例中的第二信息)，第一上行消息可以包括以下至少之一：重配完成消息，切换执行/完成MAC CE，C-RNTI MAC CE，缓存状态报告BSR，数据，调度请求SR等。
其中，UE发送完第一上行消息后，监听目标网络设备发送的第二下行信息(对应上述实施例中的第三信息)，所述第二下行信息用于响应第一上行消息。可选的，UE在收到第二下行信息后，停止第一定时器和/或第二定时器。
其中，切换执行/完成MAC CE用于响应于所述目标小区的配置信息，也就是说UE使用了所述目标小区提供的配置信息。
(b)监听所述目标小区的下行控制信道PDCCH，所述PDCCH用于调度上下行资源。
其中，若UE无可用上行资源发送第一上行消息，则执行本步骤。
(c)启动第一定时器(新定时器new timer，第一定时器对应的时长为第一时长，或者，第一定时器可以为定时器T304)。
第一定时器用于UE适时的回退至随机接入流程，避免由于TA无效或由于波束指示不合理导致的切换失败。
(d)启动第二定时器(第二定时器可以为定时器T304，第二定时器对应的时长为第三时长)。
第二定时器可以为相关技术中的定时器，用于判断切换是否失败，在UE收到切换命令时启动，若切换成功则停止该定时器，超时则认为切换失败，并触发链接重建立流程。可选地，第一定时器时长可以小于第二定时器时长。
在一些实施例中，第一定时器超时行为包括以下(a)-(c)中的至少之一：
(a)发起4step随机接入流程。
可选的，若第二定时器超时，UE触发连接重建立或执行(c)。
可选的，若无满足条件的波束，UE触发连接重建立或执行(c)。
(b)发起2步随机接入流程。
可选的，若第二定时器超时，UE触发连接重建立或执行(c)。
可选的，若无满足条件的波束，UE触发连接重建立或执行(c)。
(c)在至少一个候选小区中确定第一候选小区，并向第一候选小区执行切换，并重启第二定时器。其中，至少一个候选小区由网络预配置给UE。可选地，第二定时器重启的时机可以根据确定到第一候选小区的时刻确定，或者，可以根据终端设备向第一候选小区对应的网络设备发送消息的时刻确定。
可选地，若在发起随机接入过程前，UE通过网络预配置或动态调度的上行资源传输第一上行消息，并将第一上行消息的MAC PDU存储在的第一缓存器中。UE根据传输Msg3/MsgA的grant大小与第一上行消息的大小是否匹配，确定传输方式：
可选地，若传输Msg3/MsgA载荷(payload)的授权(grant)大小匹配第一上行消息的MAC PDU，UE可以从第一缓存器中获取第一上行消息的MAC PDU并通过Msg3/MsgA传输；具体的UE从第一缓存器(HARQ buffer)获取MAC PDU并存储到Msg3/A buffer中。
可选地，若传输Msg3/MsgA payload的grant大小与第一上行消息的MAC PDU不匹配，UE从第一缓存器中获取第一上行消息的MAC PDU，并指示复用和组装(Multiplexing and assembly)实体根据Msg3/MsgA payload的grant大小重新组建第一上行消息，新组建的第一上行消息包含原第一上行消息中的全部或部分MAC SDU/MAC CE。具体的，指示Multiplexing and assembly entity在新的传输中携带MAC subPDU(s)，该MAC subPDU(s)包括了MAC PDU中的MAC SDU。
在一些实施例中，在UE确定目标小区之前，UE确定所述目标小区的TA值，同时启动第三定时器和或存储当前第一RSRP。其中，第一RSRP包括在第一测量结果中。
可选地，UE确定目标小区的TA值包括以下之一：
UE接收源网络发送的目标小区的TA值，比如TA command MAC CE；
UE自己确定目标小区的TA值，比如通过UE侧自己计算确定。
可选地，在UE确定目标小区的TA值的情况下，UE可以向源网络设备/目标网络设备上报用于确定TA值的信息。例如，UE可以通过RSRP或下行(DownLink,DL)TA差值(timing difference) 确定TA值。
可选地，第三定时器可以用于维护所述目标小区的TA值的有效性，UE确定目标小区TA值时启动/重启该第三定时器，在第三定时器运行期间内，认为TA值有效。若UE向目标小区发起切换时第三定时器超时，UE认为TA值无效，回退至基于RACH的切换流程(同第一定时器超时行为)。
UE可以存储确定目标小区TA时的第一RSRP，目的是确定目标小区的TA值的有效性，UE向目标小区发起切换时，确定第二RSRP，若第一RSRP和第二RSRP差值超过预配置的门限值(对应上述实施例中的第一阈值)，则认为目标小区的TA值无效。回退至基于RACH的切换流程。其中，第二RSRP包括在第二测量结果中。
在一些实施例中，在第一定时器超时前，UE的行为可以包括以下(a)-(b)中的之一：
(a)确定第一信息所指示的波束是否满足第一门限(对应上述实施例中的第二阈值)，若不满足，UE认为第一定时器超时，或者说，如果不满足，所述终端设备通过随机接入流程接入所述目标小区。
(b)确定目标小区是否存在满足第一门限的波束，若不存在，则认为第一定时器超时，或者说，若不存在，所述终端设备通过随机接入流程接入所述目标小区。
在一些实施例中，第一定时器的停止条件可以包括：
UE接收到了目标网络设备发送的第一下行消息，第一下行消息可以是PDCCH或PDSCH承载的任何消息。可选地，第一下行消息可以是UE竞争解决标识MAC CE(contention resolution identity MAC CE)。
在一些实施例中，第一信息包括以下至少之一：
服务小区索引；其中，服务小区索引也可以称为目标小区的索引；
目标小区的TA信息；目标小区的TA信息可以包括目标小区的TA值，或目标小区的TA调整值；
目标小区的波束信息；目标小区的波束信息可以包括以下至少之一：目标小区的TCI state，目标小区的SSB index，目标小区的CSI-RS index；
第一资源或第一资源标识；第一资源可以包括CG资源，或者DG资源；
所述目标小区的C-RNTI；
RACH-less切换类型指示；
L1/L2切换类型指示。
其中，第一资源可以为上述实施例中的目标小区向终端设备配置的资源信息。
在一些实施例中，UE确定目标小区包括以下(a)-(b)中的之一：
(a)基于网络(Network-based，NW-based)：UE接收切换命令，切换命令中指示目标小区；
(b)基于UE(UE-based)：UE基于条件/测量事件确定目标小区；
在一些实施例中，若UE向第一候选小区切换成功，存储/生成第一报告。
在一些实施例中，若UE向目标小区发起随机接入成功，存储/生成第二报告。
在一些实施例中，UE上报网络当前有存储的第一和或第二报告，并基于网络侧的指示信息上报第一/第二报告。
在本申请实施例中，终端设备可以提前采取回退随机接入的方法来避免由于切换失败导致的连接重建立。
本申请实施例提供了一种基于定时器回退随机接入的方法，包括UE基于第一定时器和或TA值的有效性，确定执行RACH-less切换或者L1/L2切换，或者执行RACH-based切换流程。
以上结合附图详细描述了本申请的优选实施方式，但是，本申请并不限于上述实施方式中的具体细节，在本申请的技术构思范围内，可以对本申请的技术方案进行多种简单变型，这些简单变型均属于本申请的保护范围。例如，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合，为了避免不必要的重复，本申请对各种可能的组合方式不再另行说明。又例如，本申请的各种不同的实施方式之间也可以进行任意组合，只要其不违背本申请的思想，其同样应当视为本申请所公开的内容。又例如，在不冲突的前提下，本申请描述的各个实施例和/或各个实施例中的技术特征可以和现有技术任意的相互组合，组合之后得到的技术方案也应落入本申请的保护范围。
还应理解，在本申请的各种方法实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。此外，在本申请实施例中，术语“下行”、“上行”和“侧行”用于表示信号或数据的传输方向， 其中，“下行”用于表示信号或数据的传输方向为从站点发送至小区的用户设备的第一方向，“上行”用于表示信号或数据的传输方向为从小区的用户设备发送至站点的第二方向，“侧行”用于表示信号或数据的传输方向为从用户设备1发送至用户设备2的第三方向。例如，“下行信号”表示该信号的传输方向为第一方向。另外，本申请实施例中，术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系。具体地，A和/或B可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
图5为本申请实施例提供的一种通信装置的结构组成示意图，如图5所示，其中，通信装置500可以应用在终端设备中，或者可以为终端设备，其中，所述通信装置500包括：
确定单元501，用于：确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；
通信单元502，用于：通过随机接入流程接入所述目标小区，或者触发连接重建立流程，或者向确定的第一候选小区执行切换。
在一些实施例中，通信单元502，还用于：在第一时长内，未接入到所述目标小区的情况下，通过随机接入流程接入所述目标小区。
在一些实施例中，所述随机接入流程包括四步随机接入流程或两步随机接入流程。
在一些实施例中，通信单元502，还用于：向目标网络设备发送第二信息后，未接收到所述目标网络设备发送的第三信息。
在一些实施例中，通信单元502，还用于：没有监听到目标网络设备发送的物理下行控制信道PDCCH或物理下行共享信道PDSCH。
在一些实施例中，所述第二信息包括以下至少之一：
重配置完成消息、切换执行/完成媒体接入控制控制单元MAC CE、小区无线网络临时标识C-RNTI MAC CE、缓存状态报告BSR、数据消息、调度请求SR。
在一些实施例中，所述第三信息包括以下至少之一：UE竞争解决标识MAC CE、下行信息。
在一些实施例中，通信单元502，还用于：向所述目标网络设备发送Msg3/MsgA；其中，在传输所送Msg3/MsgA载荷的授权大小，大于或等于所述上行媒体访问控制MAC协议数据单元PDU的情况下，通过Msg3/MsgA向所述目标网络设备发送所述上行MAC PDU。
在一些实施例中，通信单元502，还用于：向所述目标网络设备发送Msg3/MsgA；其中，在传输Msg3/MsgA载荷的授权大小，小于所述上行MAC PDU的情况下，从所述上行MAC PDU中确定所述部分或全部MAC服务数据单元SDU和/或部分或全部MAC CE，并通过Msg3/MsgA向所述目标网络设备发送所述部分或全部MAC SDU和/或部分或全部MAC CE。
在一些实施例中，确定单元501，还用于：确定所述目标小区的定时提前TA值；通信单元502，还用于：从确定到所述目标小区的TA值开始的第二时长后，通过随机接入流程接入所述目标小区。
在一些实施例中，通信单元502，还用于：在从确定到所述目标小区的TA值开始的所述第二时长内，根据所述目标小区的TA值，未接入到所述目标小区的情况下，在所述第二时长后，通过随机接入流程接入所述目标小区。
在一些实施例中，通信单元502，还用于：接收源网络设备发送的所述目标小区的TA值。
在一些实施例中，通信单元502，还用于：向源网络设备发送上行参考信号，接收所述源网络设备发送的所述目标小区的TA值。
在一些实施例中，确定单元501，还用于：根据所述目标小区的第一测量结果，确定所述目标小区的TA值。
在一些实施例中，确定单元501，还用于：根据源小区的TA值、所述源小区和所述目标小区的TA差值，确定所述目标小区的TA值。
在一些实施例中，确定单元501，还用于：通过随机接入流程，确定所述目标小区的TA值。
在一些实施例中，确定单元501，还用于：在确定目标小区或第一信息之前，确定所述目标小区的第一测量结果；其中，确定所述目标小区的第一测量结果的时间，与确定所述目标小区的TA值的时间对应；在接收到源网络设备发送的切换命令或者在需要执行切换的情况下，确定所述目标小区的第二测量结果；
通信单元502，还用于：在所述第一测量结果与所述第二测量结果的差值的绝对值大于第一阈值的情况下，通过随机接入流程接入所述目标小区。
在一些实施例中，通信单元502，还用于：在所述第一测量结果与所述第二测量结果的差值的绝对值小于或等于所述第一阈值的情况下，向所述目标小区执行切换。
在一些实施例中，通信单元502，还用于：在确定所述目标小区的波束信息的测量结果小于或 等于第二阈值的情况下，通过随机接入流程接入所述目标小区；其中，所述目标小区的波束信息通过所述第一信息指示。
在一些实施例中，通信单元502，还用于：在确定所述目标小区的波束信息中，不存在测量结果大于第二阈值的波束信息的情况下，通过随机接入流程接入所述目标小区。
在一些实施例中，通信单元502，还用于：在确定所述目标小区的波束信息的测量结果大于所述第二阈值的情况下，向所述目标小区执行切换。
在一些实施例中，通信单元502，还用于：在确定所述目标小区的波束信息中，存在测量结果大于所述第二阈值的波束信息的情况下，向所述目标小区执行切换。
在一些实施例中，通信单元502，还用于：在第三时长内，未接入到所述目标小区的情况下，触发连接重建立流程，或者确定第一候选小区，并向所述第一候选小区执行切换。
在一些实施例中，所述第三时长大于所述通信装置500通过随机接入流程接入所述目标小区对应的第一时长。
在一些实施例中，所述第一时长和/或第三时长对应的定时器的开启时刻，根据所述通信装置500确定到所述目标小区的时刻确定。
在一些实施例中，通信单元502，还用于：在确定所述目标小区的波束信息的测量值小于第三阈值的情况下，触发连接重建立流程，或者确定第一候选小区，并向所述第一候选小区执行切换。
在一些实施例中，确定单元501，还用于：根据对至少一个候选小区的测量结果，确定所述第一候选小区；其中，所述至少一个候选小区是源网络设备向所述通信装置500指示的。
在一些实施例中，通信单元502，还用于：接收源网络设备发送的切换命令，所述切换命令中携带所述目标小区的标识或所述第一信息。
在一些实施例中，确定单元501，还用于：根据对至少一个候选小区的测量结果，确定所述目标小区或所述第一信息；其中，所述至少一个候选小区是源网络设备向所述通信装置500指示的。
在一些实施例中，所述第一信息包括以下至少之一：
所述目标小区的索引或标识；
所述目标小区的TA值；
源小区和所述目标小区的TA差值；
所述目标小区的波束信息；
所述目标小区向所述通信装置500配置的资源信息；
所述目标小区的C-RNTI；
无随机接入信道RACH-less切换类型指示；
L1/L2切换类型指示。
在一些实施例中，所述通信装置500还包括：存储单元，存储单元用于：在向第一候选小区切换成功的情况下，存储/生成第一报告；或者，在向所述目标小区随机接入成功的情况下，存储/生成第二报告。
在一些实施例中，通信单元502，还用于以下之一：
向所述第一候选小区对应的网络设备发送所述第一报告；
向目标网络设备发送所述第二报告；
接收所述第一候选小区对应的网络设备发送的第一上报请求，向所述第一候选小区对应的网络设备发送所述第一报告；
接收目标网络设备发送的第二上报请求，向所述目标网络设备发送所述第二报告；
向所述第一候选小区对应的网络设备发送用于指示存储有所述第一报告的指示信息，接收所述第一候选小区对应的网络设备发送的第一上报请求，向所述第一候选小区对应的网络设备发送所述第一报告；
向目标网络设备发送用于指示存储有所述第二报告的指示信息，接收所述目标网络设备发送的第二上报请求，向所送目标网络设备发送所述第二报告。
在一些实施例中，通信单元502，还用于：向所述目标小区执行L1/L2切换；或者，向所述目标小区执行RACH less切换。
图6为本申请实施例提供的另一种通信装置的结构组成示意图，如图6所示，其中，通信装置600可以应用在源网络设备中，或者可以为源网络设备，其中，所述通信装置600包括：
通信单元601，用于向终端设备发送目标小区的标识或第一信息；其中，所述第一信息用于指示目标小区；
所述目标小区的标识或所述第一信息，用于所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
在一些实施例中，通信装置600还包括：确定单元602，确定单元602用于：确定目标小区的标识或第一信息。
在一些实施例中，所述第一信息包括以下至少之一：
所述目标小区的索引或标识；
所述目标小区的TA值；
所述源小区和所述目标小区的TA差值；
所述目标小区的波束信息；
所述目标小区向所述终端设备配置的资源信息；
所述目标小区的C-RNTI；
无随机接入信道RACH-less切换类型指示；
L1/L2切换类型指示。
本领域技术人员应当理解，本申请实施例的上述通信装置的相关描述可以参照本申请实施例的通信方法的相关描述进行理解。
图7为本申请实施例提供的一种通信设备示意性结构图，该通信设备700可以包括以下之一：终端设备或源网络设备。图7所示的通信设备700可以包括处理器710和存储器720，所述存储器720存储有可在处理器710上运行的计算机程序，所述处理器710执行所述程序时实现上述任一实施例中的通信方法。
可选地，存储器720可以是独立于处理器710的一个单独的器件，也可以集成在处理器710中。
在一些实施例中，如图7所示，通信设备700还可以包括收发器730，处理器710可以控制该收发器730与其他设备进行通信，具体地，可以向其他设备发送信息或数据，或接收其他设备发送的信息或数据。
其中，收发器730可以包括发射机和接收机。收发器730还可以进一步包括天线，天线的数量可以为一个或多个。
在一些实施例中，该通信设备700具体可为本申请实施例的终端设备或源网络设备，并且该通信设备700可以实现本申请实施例的各个方法中由终端设备或源网络设备实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机存储介质，所述计算机存储介质存储有一个或者多个程序，所述一个或者多个程序可被一个或者多个处理器执行，以实现本申请任一实施例中的通信方法。
在一些实施例中，该计算机可读存储介质可应用于本申请实施例中的终端设备或源网络设备，并且该计算机程序使得计算机执行本申请实施例的各个方法中由终端设备或源网络设备实现的相应流程，为了简洁，在此不再赘述。
图8为本申请实施例的芯片的示意性结构图，图8所示的芯片800包括处理器810，处理器810用于从存储器中调用并运行计算机程序，以实现本申请任一实施例中的方法。
在一些实施例中，如图8所示，芯片800还可以包括存储器820。其中，处理器810可以从存储器820中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器820可以是独立于处理器810的一个单独的器件，也可以集成在处理器810中。
在一些实施例中，该芯片800还可以包括输入接口830。其中，处理器810可以控制该输入接口830与其他设备或芯片进行通信，具体地，可以获取其他设备或芯片发送的信息或数据。
在一些实施例中，该芯片800还可以包括输出接口840。其中，处理器810可以控制该输出接口840与其他设备或芯片进行通信，具体地，可以向其他设备或芯片输出信息或数据。
在一些实施例中，该芯片可应用于本申请实施例中的终端设备或源网络设备，并且该芯片可以实现本申请实施例的各个方法中由终端设备或源网络设备实现的相应流程，为了简洁，在此不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片，系统芯片，芯片系统或片上系统芯片等。
本申请实施例还提供了一种计算机程序产品，所述计算机程序产品包括计算机存储介质，所述计算机存储介质存储计算机程序，所述计算机程序包括能够由至少一个处理器执行的指令，当所述指令由所述至少一个处理器执行时实现本申请任一实施例中的通信方法。
在一些实施例中，该计算机程序产品可应用于本申请实施例中的终端设备或源网络设备，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由终端设备或源网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，本申请实施例中的计算机程序产品在另一些实施例中也可以称为软件产品。
本申请实施例还提供了一种计算机程序，所述计算机程序使得计算机执行本申请任一实施例中的通信方法。
在一些实施例中，该计算机程序可应用于本申请实施例中的终端设备或源网络设备，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由终端设备或源网络设备实现的相应流程，为了简洁，在此不再赘述。
本申请实施例的处理器、通信装置、处理器或芯片可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器、通信装置或者芯片可以包括以下任一个或多个的集成：通用处理器、特定用途集成电路(Application Specific Integrated Circuit，ASIC)、数字信号处理器(Digital Signal Processor，DSP)、数字信号处理装置(Digital Signal Processing Device，DSPD)、可编程逻辑装置(Programmable Logic Device，PLD)、现场可编程门阵列(Field Programmable Gate Array，FPGA)、中央处理器(Central Processing Unit，CPU)、图形处理器(Graphics Processing Unit，GPU)、嵌入式神经网络处理器(neural-network processing units，NPU)、控制器、微控制器、微处理器、可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器或计算机存储介质可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，上述存储器或计算机存储介质为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到 另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
在本申请的任一实施例中，时间间隔、时间段、时长范围内、时长内或时间窗内等，可以包括全部的端点时间，或者可以包括部分的端点时间(例如包括左端点时间而不包括右端点时间，或者包括右端点时间而不包括左端点时间)，或者不包括端点时间。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，)ROM、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (34)

  1. 一种通信方法，所述方法包括：
    终端设备确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；
    所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
  2. 根据权利要求1所述的方法，所述终端设备通过随机接入流程接入所述目标小区，包括：
    在第一时长内，所述终端设备未接入到所述目标小区的情况下，所述终端设备通过随机接入流程接入所述目标小区。
  3. 根据权利要求2所述的方法，所述随机接入流程包括四步随机接入流程或两步随机接入流程。
  4. 根据权利要求2或3所述的方法，所述终端设备未接入到所述目标小区，包括以下之一：
    所述终端设备向目标网络设备发送第二信息后，未接收到所述目标网络设备发送的第三信息；
    所述终端设备没有监听到目标网络设备发送的物理下行控制信道PDCCH或物理下行共享信道PDSCH。
  5. 根据权利要求4所述的方法，所述第二信息包括以下至少之一：
    重配置完成消息、切换执行/完成媒体接入控制控制单元MAC CE、小区无线网络临时标识C-RNTI MAC CE、缓存状态报告BSR、数据消息、调度请求SR。
  6. 根据权利要求4或5所述的方法，所述第三信息包括以下至少之一：所述终端设备的竞争解决标识MAC CE、下行信息。
  7. 根据权利要求4-6任一项所述的方法，所述终端设备通过随机接入流程接入所述目标小区，包括：所述终端设备向所述目标网络设备发送Msg3/MsgA；其中，在传输所送Msg3/MsgA载荷的授权大小，大于或等于所述上行媒体访问控制MAC协议数据单元PDU的情况下，通过Msg3/MsgA向所述目标网络设备发送所述上行MAC PDU。
  8. 根据权利要求4-6任一项所述的方法，所述终端设备通过随机接入流程接入所述目标小区，包括：所述终端设备向所述目标网络设备发送Msg3/MsgA；其中，在传输Msg3/MsgA载荷的授权大小，小于所述上行MAC PDU的情况下，从所述上行MAC PDU中确定所述部分或全部MAC服务数据单元SDU和/或部分或全部MAC CE，并通过Msg3/MsgA向所述目标网络设备发送所述部分或全部MAC SDU和/或部分或全部MAC CE。
  9. 根据权利要求1所述的方法，所述方法还包括：
    所述终端设备确定所述目标小区的定时提前TA值；
    所述终端设备通过随机接入流程接入所述目标小区，包括：
    所述终端设备从确定到所述目标小区的TA值开始的第二时长后，通过随机接入流程接入所述目标小区。
  10. 根据权利要求9所述的方法，所述终端设备从确定到所述目标小区的TA值开始的第二时长后，通过随机接入流程接入所述目标小区，包括：
    在所述终端设备从确定到所述目标小区的TA值开始的所述第二时长内，所述终端设备根据所述目标小区的TA值，未接入到所述目标小区的情况下，所述终端设备在所述第二时长后，通过随机接入流程接入所述目标小区。
  11. 根据权利要求9或10所述的方法，所述终端设备确定所述目标小区的定时提前TA值，包括以下之一：
    所述终端设备接收源网络设备发送的所述目标小区的TA值；
    所述终端设备向源网络设备发送上行参考信号，接收所述源网络设备发送的所述目标小区的TA值；
    所述终端设备根据所述目标小区的第一测量结果，确定所述目标小区的TA值；
    所述终端设备根据源小区的TA值、所述源小区和所述目标小区的TA差值，确定所述目标小区的TA值；
    所述终端设备通过随机接入流程，确定所述目标小区的TA值。
  12. 根据权利要求1所述的方法，所述方法还包括：
    在所述终端设备确定目标小区或第一信息之前，所述终端设备确定所述目标小区的第一测量结果；其中，确定所述目标小区的第一测量结果的时间，与确定所述目标小区的TA值的时间对应；
    在所述终端设备接收到源网络设备发送的切换命令或者在所述终端设备需要执行切换的情况下， 所述终端设备确定所述目标小区的第二测量结果；
    所述终端设备通过随机接入流程接入所述目标小区，包括：
    在所述第一测量结果与所述第二测量结果的差值的绝对值大于第一阈值的情况下，所述终端设备通过随机接入流程接入所述目标小区。
  13. 根据权利要求12所述的方法，所述方法还包括：在所述第一测量结果与所述第二测量结果的差值的绝对值小于或等于所述第一阈值的情况下，所述终端设备向所述目标小区执行切换。
  14. 根据权利要求1所述的方法，所述终端设备通过随机接入流程接入所述目标小区，包括：
    在所述终端设备确定所述目标小区的波束信息的测量结果小于或等于第二阈值的情况下，所述终端设备通过随机接入流程接入所述目标小区；其中，所述目标小区的波束信息通过所述第一信息指示；或者，
    在所述终端设备确定所述目标小区的波束信息中，不存在测量结果大于第二阈值的波束信息的情况下，所述终端设备通过随机接入流程接入所述目标小区。
  15. 根据权利要求14所述的方法，所述方法还包括：
    在所述终端设备确定所述目标小区的波束信息的测量结果大于所述第二阈值的情况下，所述终端设备向所述目标小区执行切换；或者，
    在所述终端设备确定所述目标小区的波束信息中，存在测量结果大于所述第二阈值的波束信息的情况下，所述终端设备向所述目标小区执行切换。
  16. 根据权利要求1-15任一项所述的方法，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换，包括：
    在第三时长内，所述终端设备未接入到所述目标小区的情况下，触发连接重建立流程，或者确定第一候选小区，并向所述第一候选小区执行切换。
  17. 根据权利要求16任一项所述的方法，所述第三时长大于所述终端设备通过随机接入流程接入所述目标小区对应的第一时长。
  18. 根据权利要求2-8、16、17任一项所述的方法，所述第一时长和/或第三时长对应的定时器的开启时刻，根据所述终端设备确定到所述目标小区的时刻确定。
  19. 根据权利要求1-15任一项所述的方法，所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换，包括：
    在所述终端设备确定所述目标小区的波束信息的测量值小于第三阈值的情况下，触发连接重建立流程，或者确定第一候选小区，并向所述第一候选小区执行切换。
  20. 根据权利要求1-19任一项所述的方法，所述确定第一候选小区，包括：
    根据对至少一个候选小区的测量结果，确定所述第一候选小区；其中，所述至少一个候选小区是源网络设备向所述终端设备指示的。
  21. 根据权利要求1-20任一项所述的方法，所述终端设备确定目标小区或第一信息，包括：
    所述终端设备接收源网络设备发送的切换命令，所述切换命令中携带所述目标小区的标识或所述第一信息；或者，
    所述终端设备根据对至少一个候选小区的测量结果，确定所述目标小区或所述第一信息；其中，所述至少一个候选小区是源网络设备向所述终端设备指示的。
  22. 根据权利要求1-21任一项所述的方法，所述第一信息包括以下至少之一：
    所述目标小区的索引或标识；
    所述目标小区的TA值；
    源小区和所述目标小区的TA差值；
    所述目标小区的波束信息；
    所述目标小区向所述终端设备配置的资源信息；
    所述目标小区的C-RNTI；
    无随机接入信道RACH-less切换类型指示；
    L1/L2切换类型指示。
  23. 根据权利要求1-22任一项所述的方法，所述方法还包括：
    在所述终端设备向第一候选小区切换成功的情况下，存储/生成第一报告；或者，
    在所述终端设备向所述目标小区随机接入成功的情况下，存储/生成第二报告。
  24. 根据权利要求23任一项所述的方法，所述方法还包括以下之一：
    所述终端设备向所述第一候选小区对应的网络设备发送所述第一报告；
    所述终端设备向目标网络设备发送所述第二报告；
    所述终端设备接收所述第一候选小区对应的网络设备发送的第一上报请求，所述终端设备向所述第一候选小区对应的网络设备发送所述第一报告；
    所述终端设备接收目标网络设备发送的第二上报请求，所述终端设备向所述目标网络设备发送所述第二报告；
    所述终端设备向所述第一候选小区对应的网络设备发送用于指示存储有所述第一报告的指示信息，所述终端设备接收所述第一候选小区对应的网络设备发送的第一上报请求，所述终端设备向所述第一候选小区对应的网络设备发送所述第一报告；
    所述终端设备向目标网络设备发送用于指示存储有所述第二报告的指示信息，所述终端设备接收所述目标网络设备发送的第二上报请求，所述终端设备向所送目标网络设备发送所述第二报告。
  25. 根据权利要求1-24任一项所述的方法，所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换之前，所述方法还包括：
    所述终端设备向所述目标小区执行L1/L2切换；或者，
    所述终端设备向所述目标小区执行RACH less切换。
  26. 一种通信方法，所述方法包括：
    源网络设备向终端设备发送目标小区的标识或第一信息；其中，所述第一信息用于指示目标小区；
    所述目标小区的标识或所述第一信息，用于所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
  27. 根据权利要求26所述的方法，所述第一信息包括以下至少之一：
    所述目标小区的索引或标识；
    所述目标小区的TA值；
    所述源小区和所述目标小区的TA差值；
    所述目标小区的波束信息；
    所述目标小区向所述终端设备配置的资源信息；
    所述目标小区的C-RNTI；
    无随机接入信道RACH-less切换类型指示；
    L1/L2切换类型指示。
  28. 一种通信装置，包括：
    确定单元，用于：确定目标小区或第一信息；其中，所述第一信息用于指示目标小区；
    通信单元，用于：通过随机接入流程接入所述目标小区，或者触发连接重建立流程，或者向所述终端设备确定的第一候选小区执行切换。
  29. 一种通信装置，包括：
    通信单元，用于：向终端设备发送目标小区的标识或第一信息；其中，所述第一信息用于指示目标小区；
    所述目标小区的标识或所述第一信息，用于所述终端设备通过随机接入流程接入所述目标小区，或者所述终端设备触发连接重建立流程，或者所述终端设备确定第一候选小区，并向所述第一候选小区执行切换。
  30. 一种通信设备，包括：处理器和存储器，所述存储器存储有可在处理器上运行的计算机程序，所述处理器执行所述程序时实现权利要求1-25任一项或者26-27任一项所述方法。
  31. 一种计算机存储介质，所述计算机存储介质存储有一个或者多个程序，所述一个或者多个程序可被一个或者多个处理器执行，以实现权利要求1-25任一项或者26-27任一项所述方法。
  32. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，以实现如权利要求1-25任一项或者26-27任一项所述方法。
  33. 一种计算机程序产品，所述计算机程序产品包括计算机存储介质，所述计算机存储介质存储计算机程序，所述计算机程序包括能够由至少一个处理器执行的指令，当所述指令由所述至少一个处理器执行时实现权利要求1-25任一项或者26-27任一项所述方法。
  34. 一种计算机程序，所述计算机程序使得计算机执行如权利要求1-25任一项或者26-27任一项所述方法。
PCT/CN2022/123266 2022-09-30 2022-09-30 通信方法、装置、设备、存储介质、芯片、产品及程序 WO2024065674A1 (zh)

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