WO2023217007A1 - 切换方法、终端及网络侧设备 - Google Patents

切换方法、终端及网络侧设备 Download PDF

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Publication number
WO2023217007A1
WO2023217007A1 PCT/CN2023/092420 CN2023092420W WO2023217007A1 WO 2023217007 A1 WO2023217007 A1 WO 2023217007A1 CN 2023092420 W CN2023092420 W CN 2023092420W WO 2023217007 A1 WO2023217007 A1 WO 2023217007A1
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WIPO (PCT)
Prior art keywords
terminal
interface message
identification information
handover
cell
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Application number
PCT/CN2023/092420
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English (en)
French (fr)
Inventor
宋二浩
鲍炜
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Publication date
Application filed by Vivo Mobile Communication Co Ltd filed Critical Vivo Mobile Communication Co Ltd
Publication of WO2023217007A1 publication Critical patent/WO2023217007A1/zh
Priority to US18/942,314 priority Critical patent/US20250071643A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H04W36/00725—Random access channel [RACH]-less handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/26—Reselection being triggered by specific parameters by agreed or negotiated communication parameters

Definitions

  • This application belongs to the field of communication technology, and specifically relates to a switching method, terminal and network side equipment.
  • Access network equipment can include a central unit (Centralized Unit, CU) and a distributed unit (Distributed Unit, DU).
  • the CU and DU are connected through the F1 interface.
  • An access network device usually only contains one CU, which contains one or more DUs, and one DU corresponds to one or more cells.
  • L1/L2 handover is a handover decision made by DU based on L1 measurement results, and a rach-less solution may be adopted.
  • the relevant technology does not provide specific solutions related to L1/L2 handover, which may easily lead to terminal L1/L2 handover failure and affect communication performance.
  • Embodiments of the present application provide a switching method, a terminal, and a network-side device, which can solve the problem of communication performance being affected by terminal L1/L2 switching failure.
  • a handover method including: S-DU initiating L1/L2 handover; the S-DU performs at least one of the following: sending a first interface message to the T-DU and receiving a second interface message; wherein , the first interface message is used to instruct the T-DU to schedule the terminal; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • a handover method including: T-DU performing at least one of the following: receiving a first interface message, and sending a second interface message to S-DU; wherein the first interface message is used to indicate that the The T-DU schedules the terminal; the second interface message includes a candidate cell TA value, the candidate cell TA value is used to send the S-DU to the terminal, and the candidate cell TA value is used when the terminal switches.
  • T-DU performing at least one of the following: receiving a first interface message, and sending a second interface message to S-DU; wherein the first interface message is used to indicate that the The T-DU schedules the terminal; the second interface message includes a candidate cell TA value, the candidate cell TA value is used to send the S-DU to the terminal, and the candidate cell TA value is used when the terminal switches.
  • Upstream synchronization including: Upstream synchronization.
  • a handover method including: CU performing at least one of the following: sending a first interface message to the T-DU and sending a second interface message to the S-DU; wherein, the first interface message It is used to instruct the T-DU to schedule the terminal; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • a handover method including: a terminal monitors the PDCCH of a T-DU to obtain a scheduling request sent by the T-DU; if the terminal successfully receives a C-RNTI containing a target cell allocation based on the scheduling request, PDCCH, the terminal sends uplink data to the T-DU.
  • a first network side device including: a communication module, configured to initiate L1/L2 handover; the communication module is further configured to perform at least one of the following: sending a first interface message to the T-DU , receiving a second interface message; wherein the first interface message is used to instruct the T-DU to schedule the terminal; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used for terminal switching upstream synchronization.
  • a second network side device including: a communication module configured to perform at least one of the following: receiving a first interface message and sending a second interface message to the S-DU; wherein the first interface The message is used to instruct the second network side device to schedule the terminal; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used to send the S-DU to the terminal.
  • the candidate cell TA The value is used for uplink synchronization when switching terminals.
  • a third network side device including: a communication module configured to perform at least one of the following: sending a first interface message to the T-DU and sending a second interface message to the S-DU; wherein, The first interface message is used to instruct the T-DU to schedule the terminal; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • a terminal including: a communication module configured to monitor the PDCCH of a T-DU to obtain the scheduling request sent by the T-DU; the communication module is also configured to receive the scheduling request successfully based on the If the PDCCH contains the C-RNTI allocated by the target cell, the uplink data is sent to the T-DU.
  • a terminal in a ninth aspect, includes a processor and a memory.
  • the memory stores programs or instructions that can be run on the processor.
  • the program or instructions are executed by the processor, the following implementations are implemented: The steps of the method described in the four aspects.
  • a terminal including a processor and a communication interface, wherein the communication interface is used to monitor the PDCCH of a T-DU to obtain a scheduling request sent by the T-DU; if the scheduling request is successfully received based on If the PDCCH contains the C-RNTI allocated by the target cell, the uplink data is sent to the T-DU.
  • a network side device in an eleventh aspect, includes a processor and a memory.
  • the memory stores programs or instructions that can be run on the processor.
  • the program or instructions are used by the processor. When executed, the steps of the method described in any one of the first to third aspects are implemented.
  • a network side device including a processor and a communication interface, wherein the processor or the communication interface is used to perform the method described in any one of the first to third aspects. Method steps.
  • a switching system including: a terminal and a network side device.
  • the terminal can be used to perform the steps of the method described in the fourth aspect.
  • the network side device can be used to perform the steps of the first aspect to The steps of the method described in any one of the third aspects.
  • a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the implementation is as described in any one of the first to fourth aspects. steps of the method.
  • a chip in a fifteenth aspect, includes a processor and a communication interface.
  • the communication interface is coupled to the processor.
  • the processor is used to run programs or instructions to implement the first to fourth aspects. The steps of the method according to any one of the aspects.
  • a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement the first aspect to the third aspect.
  • the S-DU initiates L1/L2 handover and performs at least one of the following: sending a first interface message to the T-DU and receiving a second interface message; wherein the first interface message is used to indicate the T-DU -DU schedules terminals to confirm handover completion or handover failure, which can avoid terminal L1/L2 handover failure and improve communication system performance; the second interface message includes the candidate cell TA value, and the candidate cell TA value is used for terminal handover uplink synchronization at the same time, thereby saving the uplink synchronization delay when the terminal performs handover, avoiding terminal L1/L2 handover failure, and improving communication system performance.
  • Figure 1 is a schematic diagram of a wireless communication system according to an embodiment of the present application.
  • Figure 2 is a schematic flow chart of a switching method according to an embodiment of the present application.
  • Figure 3 is a schematic flow chart of a switching method according to an embodiment of the present application.
  • Figure 4 is a schematic flow chart of a switching method according to an embodiment of the present application.
  • Figure 5 is a schematic flow chart of a switching method according to an embodiment of the present application.
  • Figure 6 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • Figure 7 is a schematic structural diagram of a first network side device according to an embodiment of the present application.
  • Figure 8 is a schematic structural diagram of a second network side device according to an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a third network side device according to an embodiment of the present application.
  • Figure 10 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • Figure 11 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • Figure 12 is a schematic structural diagram of a network side device according to an embodiment of the present application.
  • first, second, etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and that "first" and “second” are distinguished objects It is usually one type, and the number of objects is not limited.
  • the first object can be one or multiple.
  • “and/or” in the description and claims indicates at least one of the connected objects, and the character “/" generally indicates that the related objects are in an "or” relationship.
  • LTE Long Term Evolution
  • LTE-Advanced, LTE-A Long Term Evolution
  • LTE-A Long Term Evolution
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency Division Multiple Access
  • NR New Radio
  • FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable.
  • the wireless communication system includes a terminal 11 and a network side device 12.
  • the terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, or a super mobile personal computer.
  • Tablet Personal Computer Tablet Personal Computer
  • laptop computer laptop computer
  • PDA Personal Digital Assistant
  • PDA Personal Digital Assistant
  • UMPC ultra-mobile personal computer
  • UMPC mobile Internet device
  • MID mobile Internet Device
  • AR augmented reality
  • VR virtual reality
  • robots wearable devices
  • WUE Vehicle User Equipment
  • PUE Pedestrian User Equipment
  • smart home home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.
  • game consoles personal computers (personal computer, PC), teller machine or self-service machine and other terminal-side devices.
  • Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets) bracelets, smart anklets etc.), smart wristbands, smart clothing, etc.
  • the network side device 12 may include an access network device or a core network device, where the access network device may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a wireless device.
  • Access network equipment may include a base station, a Wireless Local Area Network (WLAN) access point or a Wireless Fidelity (WiFi) node, etc.
  • the base station may be called a Node B, an Evolved Node B (eNB), or an access point.
  • BTS Base Transceiver Station
  • BSS Basic Service Set
  • ESS Extended Service Set
  • TRP Transmission Reception Point
  • the base station is not limited to specific technical terms. It should be noted that in this application, in the embodiment, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.
  • the embodiment of the present application provides a switching method 200, which can be executed by the source-distributed unit (Source-Distributed Unit, S-DU).
  • S-DU Source-Distributed Unit
  • the method can be executed by the software installed on the S-DU.
  • the method includes the following steps.
  • S202 S-DU initiates L1/L2 handover.
  • the S-DU is the serving network side device before the terminal L1/L2 is switched
  • the T-DU mentioned later is the serving network side device after the terminal L1/L2 is switched.
  • Each embodiment of the present application can be applied in a random access (rach-less) scenario, and can also be applied in a non-rach-less scenario.
  • This step of S-DU initiating L1/L2 handover includes, for example: S-DU issuing an L1/L2 handover command to the terminal.
  • the S-DU performs at least one of the following: sending a first interface message to a target distributed unit (Target-Distributed Unit, T-DU) and receiving a second interface message; wherein the first interface message is used to Instruct the T-DU to schedule the terminal; the second interface message includes a candidate cell timing advance (Timing Advance, TA) value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • T-DU target distributed unit
  • T-DU target distributed unit
  • TA candidate cell timing advance
  • this embodiment does not impose a mandatory limit on the order in which S202 and S204 occur. That is, the order of S202 and S204 can be adjusted, and they can also be initiated at the same time.
  • the first interface message is used to notify T-DU handover initiation and the target cell to be handover.
  • the first interface message includes at least one of the following: 1) indication information for indicating L1/L2 handover initiation; 2) identification information of a target cell, and the target cell is the terminal L1/L2 The serving cell after handover; 3) Transmission Configuration Indicator (TCI) status associated with the target cell, which is the serving cell after handover of the terminal L1/L2; 4)
  • the T-DU scheduling The maximum number of times for the terminal; 5) The duration of the first timer.
  • the T-DU schedules the terminal during the running of the first timer. It can be understood that the T-DU can be started after initiating the first scheduling of the terminal.
  • the first timer during the running of the first timer, if scheduling the terminal fails, the T-DU can schedule the terminal again; if the first timer times out, the T-DU can no longer schedule the terminal.
  • the S-DU sends a first interface message to the central unit (Centralized Unit, CU).
  • the first interface message may be, for example, a terminal context modification request (UE Context Modification Require) message; after receiving the first interface message, the CU sends a message to the T -DU sends a first interface message, such as a terminal context modification request (UE Context Modification Request) message, and the above first interface message is associated with the terminal to be switched.
  • UE Context Modification Require terminal context modification request
  • UE Context Modification Request terminal context modification request
  • the S-DU sends the first interface message to the CU and sends the downlink data transmission status indication (Downlink Data Delivery Status) to the CU.
  • the purpose is to inform the CU of the downlink data packets that have not been successfully transmitted in the S-DU so that the CU can send Let T-DU continue transmission.
  • the T-DU can schedule the terminal, for example, send uplink scheduling (UL Grant) or trigger aperiodic channel state information (Channel State Information, CSI) reporting, etc., the T-DU
  • UL Grant uplink scheduling
  • CSI Channel State Information
  • the purpose of -DU scheduling the terminal may be to confirm handover completion or handover failure.
  • the T-DU schedules the terminal and successfully decodes the data carried by the Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) sent by the terminal, the handover is confirmed; If the T-DU fails to successfully decode the data carried by the PUCCH or PUSCH channel sent by the terminal, the T-DU can schedule the terminal again until the number of scheduling times exceeds the maximum number of scheduling times, or the scheduling time exceeds the first timer duration. Optionally, if the number of times the T-DU schedules the terminal exceeds the maximum number of scheduling times, or the scheduling time exceeds the first timer duration, the scheduling of the terminal can be stopped, and the T-DU confirms that the handover fails.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • This embodiment can be an inter-DU (inter-DU) L1/L2 handover, the handover execution can be rach-less, and the T-DU can obtain the L1/L2 through the first interface message sent by the S-DU.
  • the handover time and the target cell of the handover are used to schedule the terminal to confirm the completion, avoid terminal L1/L2 handover failure, and improve communication system performance.
  • the T-DU sends an interface message to the CU, such as the UE Context Modification Require message, which carries the candidate cell TA value, etc.; the CU sends a second interface message to the S-DU, such as the UE Context Modification Request message.
  • the second interface message The message carries the TA value of the candidate cell.
  • the T-DU sends the terminal's TA value in the candidate cell to the S-DU, and the S-DU is sent to the terminal to obtain uplink synchronization in the target cell, thereby saving the terminal uplink synchronization time during handover execution. delay to avoid terminal L1/L2 handover failure and improve communication system performance.
  • the S-DU can obtain the TA information of the terminal in the target cell through the second interface message, thereby saving the uplink synchronization delay of the terminal during handover execution and avoiding the terminal L1/L2 handover.
  • L2 handover fails, improve communication system performance.
  • the S-DU initiates L1/L2 handover and performs at least one of the following: sending a first interface message to the T-DU and receiving a second interface message; wherein the first interface message is used for Instructing the T-DU to schedule the terminal to confirm handover completion or handover failure can avoid terminal L1/L2 handover failure and improve communication system performance; the second interface message includes a candidate cell TA value, and the candidate cell TA value It is used for uplink synchronization during terminal handover, thereby saving the uplink synchronization delay when the terminal performs handover, avoiding terminal L1/L2 handover failure, and improving communication system performance.
  • the method further includes: the S-DU receives a third interface message, and the third interface message is The T-DU is sent after confirming that the handover is completed or the handover fails, and the third interface message includes at least one of the following: 1) the identification information of the terminal; 2) the identification information of the source cell, and the source cell is The serving cell before the terminal L1/L2 is switched; 3) the identification information of the target cell, the target cell is the serving cell after the terminal L1/L2 is switched; 4) and the applied radio resource control (Radio Resource Control) , RRC) The index or identifier associated with the reconfiguration message; 5) Indication information used to indicate L1/L2 handover completion or handover failure.
  • Radio Resource Control Radio Resource Control
  • the T-DU can send an interface message to the CU, such as a UE Context Modification Require message, to indicate to the CU that the L1/L2 handover is successful or the handover fails; in this way, the CU can send a message to the S- DU sends a third interface message, such as UE Context Modification Request message.
  • a third interface message such as UE Context Modification Request message.
  • the second interface message mentioned in Embodiment 200 also includes at least one of the following: 1) Identification information of the source cell, where the source cell is the terminal before L1/L2 handover. the serving cell; 2) the identification information of the candidate cell, which is the candidate cell for the terminal L1/L2 handover; 3) the identification information of the terminal.
  • the method before the S-DU receives the second interface message, the method further includes: the S-DU sends a random access channel (Random Access Channel, RACH) resource (RACH) to the terminal.
  • RACH Random Access Channel
  • RACH Sounding Reference Signal
  • SRS Sounding Reference Signal
  • S-DU sends RACH resources or SRS resources to the terminal
  • T-DU obtains the terminal's TA value in the candidate cell based on the Preamble or SRS sent by the terminal
  • T-DU sends the candidate cell
  • the TA value is sent to the S-DU
  • the S-DU is sent to the terminal.
  • This embodiment facilitates the T-DU to obtain the TA value of the terminal in the candidate cell.
  • the method before the S-DU sends RACH resources or SRS resources to the terminal, the method further includes: the S-DU receives a fourth interface message, and the fourth interface message includes At least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell, the target cell The cell is the serving cell after the terminal L1/L2 is switched; 4) The candidate cell allocates RACH resources or SRS resources to the terminal.
  • the S-DU can obtain the RACH resources or SRS resources allocated by the candidate cell to the terminal, and thus can also indicate the RACH resources or SRS resources to the terminal, so that the T-DU can use the Preamble or SRS sent by the terminal to Obtain the TA value of the terminal in the candidate cell.
  • the T-DU sends an interface message to the CU, which contains the RACH resources or SRS resources allocated by the candidate cell to the terminal; the CU sends a fourth interface message to the S-DU, including the RACH allocated by the candidate cell for the terminal. resources or SRS resources, etc.
  • the method before the S-DU receives the fourth interface message, the method further includes: the S-DU sends a fifth interface message, and the fifth interface message is used to request the RACH resource or SRS resource, the fifth interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, the source cell is the serving cell before the terminal L1/L2 handover ; 3) Identification information of the target cell, which is the serving cell after the terminal L1/L2 is switched; 4) Instruction information for requesting RACH resources or SRS resources.
  • the S-DU sends a fifth interface message to the CU.
  • the fifth interface message includes instruction information for requesting RACH resources or SRS resources.
  • the CU sends an interface message to the T-DU, including a request for RACH resources. Or instruction information of SRS resources, etc.
  • This embodiment facilitates the T-DU to obtain the TA value of the terminal in the candidate cell based on the Preamble or SRS sent by the terminal by requesting RACH resources or SRS resources for the terminal.
  • the RACH resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, used uplink carrier, reference signal (Reference Signal, RS) of the associated candidate cell. ) index, identification information of the associated candidate cell, Physical Random Access Channel (PRACH) mask index, Preamble index;
  • the SRS resource includes at least one of the following: frequency point, time-frequency domain location, transmission Period, offset, uplink carrier used by the terminal, RS index of the associated candidate cell, and identification information of the associated candidate cell.
  • the method further includes: the S-DU sending the candidate cell TA value to the terminal; or, the S-DU -DU carries the TA value of the target cell in the L1/L2 handover command, and the target cell is the terminal Serving cell after L1/L2 handover.
  • the S-DU sends the TA value of the candidate cell to the terminal, or when triggering L1/L2 handover, the S-DU carries the TA value of the target cell in the L1/L2 handover command.
  • the L1/L2 handover command may be a downlink control Information (Downlink Control Information, DCI) or Media Access Control Control Element (MAC CE), the candidate cell TA value can be the absolute TA value of the terminal in the candidate cell, or it can be relative to the serving cell Relative TA value of TA value.
  • DCI Downlink Control Information
  • MAC CE Media Access Control Control Element
  • the candidate cell TA value is used for uplink synchronization during terminal handover, thereby saving the uplink synchronization delay when the terminal performs handover, avoiding terminal L1/L2 handover failure, and improving communication system performance.
  • the method further includes: the S-DU sends a sixth interface message to the T-DU and/or central unit (CU), the sixth interface message includes at least one of the following: 1) Identification information of the candidate cell; 2) L1 measurement results of the candidate cell; 3) Channel State Information (CSI) measurement results of the candidate cell; 4) Identification information of the terminal; wherein, the The candidate cell is a candidate cell for handover of the terminal L1/L2.
  • the S-DU sends a sixth interface message to the T-DU and/or central unit (CU)
  • the sixth interface message includes at least one of the following: 1) Identification information of the candidate cell; 2) L1 measurement results of the candidate cell; 3) Channel State Information (CSI) measurement results of the candidate cell; 4) Identification information of the terminal; wherein, the The candidate cell is a candidate cell for handover of the terminal L1/L2.
  • the S-DU sends the L1 measurement results of the candidate cells to the CU, and the CU modifies/releases the candidate cells or initiates L3 handover based on the measurement results.
  • the S-DU sends the L1 measurement results of the candidate cell or the CSI measurement results of the candidate cell to the T-DU, and the T-DU performs subsequent scheduling and L1/L2 handover decisions based on the L1 measurement results or CSI measurement results. .
  • the T-DU can obtain the CSI measurement results of the terminal in the target cell through the sixth interface message sent by the S-DU, so as to perform timely scheduling after the handover is completed.
  • the timing of sending the sixth interface message is one of the following: 1) periodically sent; 2) sent when the S-DU initiates L1/L2 switching or issues an L1/L2 switching command. ;3) The S-DU is sent when it receives the Hybrid Automatic Repeat Request (HARQ) feedback of the L1/L2 switching command; 4) The S-DU receives the L1 measurement result reported by the terminal 5) The S-DU is sent when it receives the CSI measurement result reported by the terminal.
  • HARQ Hybrid Automatic Repeat Request
  • the sixth interface message is sent when the S-DU initiates L1/L2 handover or when the S-DU receives HARQ feedback of the L1/L2 handover command; wherein , the CSI measurement result of the candidate cell is the CSI measurement result of the target cell, and the target cell is the serving cell after the terminal L1/L2 is switched.
  • the CSI measurement results of the candidate cells may only include the CSI measurement results of the target cell, but not the CSI measurement results of other candidate cells.
  • the switching method according to the embodiment of the present application is described in detail above with reference to FIG. 2 .
  • a switching method according to another embodiment of the present application will be described in detail below with reference to FIG. 3 .
  • the description of the T-DU is the same as or corresponding to the description of the S-DU in the method shown in Figure 2. To avoid duplication, the relevant description is appropriately omitted.
  • FIG 3 is a schematic flow chart of the switching method according to the embodiment of the present application, which can be applied to T-DU. As shown in Figure 3, the method 300 includes the following steps.
  • T-DU performs at least one of the following: receiving a first interface message and sending a second interface message to S-DU; wherein the first interface message is used to instruct the T-DU to schedule the terminal;
  • the second interface message includes a candidate cell TA value, the candidate cell TA value is used for sending the S-DU to the terminal, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • the S-DU is the serving network side device before the terminal L1/L2 is switched
  • the T-DU is the serving network side device after the terminal L1/L2 is switched.
  • the S-DU sends an interface message to the CU, such as a terminal context modification request (UE Context Modification Require) message; after receiving the interface message, the CU forwards the first interface message to the T-DU, such as a terminal context modification request (UE context modification request).
  • UE Context Modification Request UE Context Modification Request
  • the above interface message is associated with the terminal to be switched.
  • the first interface message is used in both Embodiment 300 and Embodiment 200. It can be understood that in different embodiments, the type of the first interface message may be different. For example, in Embodiment 200, the first interface message may be of different types. An interface message may be a UE Context Modification Require message, and the first interface message in embodiment 300 may be a UE Context Modification Request message. Similarly, in different embodiments, the types of the second interface message, the third interface message, etc. may be different.
  • the T-DU sends a second interface message to the CU, such as the UE Context Modification Require message, which carries the candidate cell TA value, etc.; the CU sends an interface message to the S-DU, such as the UE Context Modification Request message, which message Carry candidate cell TA value.
  • the T-DU sends the terminal's TA value in the candidate cell to the S-DU, and the S-DU is sent to the terminal to obtain uplink synchronization in the target cell, thereby saving the uplink synchronization delay of the terminal during handover execution. Avoid terminal L1/L2 switching failure and improve communication system performance.
  • the implementation details of how the T-DU schedules the terminal to confirm handover completion or handover failure can be found in the description of Embodiment 200.
  • the T-DU performs at least one of the following: receiving a first interface message and sending a second interface message to the S-DU; wherein the first interface message is used to indicate that the T-DU Scheduling terminals can avoid terminal L1/L2 handover failure and improve communication system performance; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches, thereby saving money.
  • the uplink synchronization delay when the terminal performs handover avoids terminal L1/L2 handover failure and improves communication system performance.
  • the first interface message includes at least one of the following: 1) indication information for indicating L1/L2 handover initiation; 2) identification information of the target cell; 3) identification information associated with the target cell. TCI state; 4) the maximum number of times the T-DU schedules the terminal; 5) the duration of the first timer, the T-DU schedules the terminal during the running of the first timer; wherein, the The target cell is the serving cell after the terminal L1/L2 is switched.
  • the T-DU scheduling of the terminal includes at least one of the following: 1) sending an uplink grant to the terminal; 2) triggering the terminal to perform aperiodic CSI reporting.
  • the T-DU may perform at least one of the following: 1) sending an uplink grant to the terminal; 2) triggering the terminal to perform aperiodic CSI reporting.
  • the method further includes: if the T-DU successfully decodes the data carried by the uplink channel sent by the terminal, confirming that the handover is completed.
  • the method further includes: if the T-DU fails to successfully decode the data carried by the uplink channel sent by the terminal, the T-DU schedules the terminal again until the number of scheduling times The maximum number of times for scheduling the terminal is exceeded, or the scheduling time exceeds the first timer duration.
  • the method further includes: if the number of times T-DU schedules the terminal reaches or exceeds the maximum number of times the terminal is scheduled, or the scheduling time exceeds the first timer duration, then Stop scheduling the terminal, and the T-DU confirms that the handover fails.
  • the method further includes: the T-DU sends a third interface message, and the third interface message is the T-DU Sent after confirmation of handover completion or handover failure, the third interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, and the source cell is the terminal L1/ The serving cell before L2 handover; 3) The identification information of the target cell, which is the serving cell after the terminal L1/L2 handover; 4) The index or identification associated with the applied Radio Resource Control RRC reconfiguration message ;5) Indication information used to indicate L1/L2 handover completion or handover failure.
  • the T-DU can send a third interface message, such as the UE Context Modification Require message, to the CU to indicate the success or failure of the L1/L2 handover to the CU; in this way, the CU can S-DU sends interface messages, such as UE Context Modification Request message.
  • a third interface message such as the UE Context Modification Require message
  • the second interface message also includes at least one of the following: 1) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 2) candidate The identification information of the cell, the candidate cell is the candidate cell for handover of the terminal L1/L2; 3) The identification information of the terminal.
  • the method before the T-DU sends the second interface message, the method further includes: the T-DU obtains the candidate cell TA value according to the Preamble or SRS sent by the terminal.
  • the method before the T-DU obtains the TA value of the candidate cell according to the Preamble or SRS sent by the terminal, the method further includes: the T-DU sends a fourth interface message, so The fourth interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell Identification information, the target cell is the serving cell after L1/L2 handover of the terminal; 4) RACH resources or SRS resources allocated by the candidate cell to the terminal.
  • the T-DU sends a fourth interface message to the CU.
  • the fourth interface message includes the RACH resources or SRS resources allocated by the candidate cell for the terminal.
  • the CU sends an interface message to the S-DU, including the RACH resources or SRS resources allocated by the candidate cell for the terminal. RACH resources or SRS resources, etc.
  • the method before the T-DU sends the fourth interface message, the method further includes: the T-DU receives a fifth interface message, and the fifth interface message is used to request the RACH resource or SRS resource, the fifth interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, the source cell is the serving cell before the terminal L1/L2 handover ; 3) Identification information of the target cell, which is the serving cell after the terminal L1/L2 is switched; 4) Instruction information for requesting RACH resources or SRS resources.
  • the S-DU sends an interface message to the CU, which contains instruction information for requesting RACH resources or SRS resources; the CU sends a fifth interface message to the T-DU, which contains instructions for requesting RACH resources or SRS resources. Resource instructions, etc.
  • the RACH resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, used uplink carrier, RS index of associated candidate cell, associated candidate cell Identification information, PRACH mask index, Preamble index;
  • the SRS resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, uplink carrier used by the terminal, RS of the associated candidate cell Index, identification information of the associated candidate cell.
  • the method further includes: the T-DU receiving a sixth interface message, the sixth interface message including at least one of the following: 1) identification information of the candidate cell; 2) candidate cell L1 measurement results; 3) CSI measurement results of the candidate cell; 4) identification information of the terminal; wherein the candidate cell is a candidate cell for L1/L2 handover of the terminal.
  • the S-DU sends the L1 measurement result of the candidate cell or the CSI measurement result of the candidate cell to the T-DU, and the T-DU makes subsequent scheduling and L1/L2 handover decisions based on the L1 measurement result or CSI measurement result.
  • the T-DU can obtain the CSI measurement results of the terminal in the target cell through the sixth interface message, so as to perform timely scheduling after the handover is completed.
  • FIG 4 is a schematic flowchart of the implementation of the switching method according to the embodiment of the present application, which can be applied to CU. As shown in Figure 4, the method 400 includes the following steps.
  • S402 CU performs at least one of the following: sending a first interface message to T-DU, sending a second interface message to S-DU, receiving the first interface message sent by S-DU, and receiving a third interface message sent by T-DU. ; Wherein, the first interface message is used to instruct the T-DU to schedule the terminal; the second interface message includes the candidate cell TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • the S-DU is the serving network side device before the terminal L1/L2 is switched
  • the T-DU is the serving network side device after the terminal L1/L2 is switched.
  • the CU performs at least one of the following: sending a first interface message to the T-DU and sending a second interface message to the S-DU; wherein the first interface message is used to indicate the T-DU -DU schedules terminals, which can avoid terminal L1/L2 handover failure and improve communication system performance; the second interface message includes the candidate cell TA value, and the candidate cell TA value is used for uplink synchronization during terminal handover, thereby saving money
  • the uplink synchronization delay when the terminal performs handover avoids terminal L1/L2 handover failure and improves communication system performance.
  • the first interface message includes at least one of the following: 1) indication information for indicating L1/L2 handover initiation; 2) identification information of the target cell; 3) identification information associated with the target cell.
  • the transmission configuration indicates the TCI status; 4) the maximum number of times the T-DU schedules the terminal; 5) the duration of the first timer, and the T-DU schedules the terminal during the running of the first timer; wherein , the target cell is the serving cell after the terminal L1/L2 is switched.
  • the method further includes: the CU sends a third interface message to the S-DU, and the third The interface message is sent by the T-DU after confirming that the handover is completed or the handover fails.
  • the third interface message includes at least one of the following: 1) the identification information of the terminal; 2) the identification information of the source cell, the The source cell is the serving cell before the terminal L1/L2 is switched; 3) the identification information of the target cell, the target cell is the serving cell after the terminal L1/L2 is switched; 4) and the applied radio resource control RRC The index or identifier associated with the reconfiguration message; 5) Instruction information used to indicate L1/L2 handover completion or handover failure.
  • the second interface message also includes at least one of the following: 1) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 2) candidate The identification information of the cell, the candidate cell is the candidate cell for handover of the terminal L1/L2; 3) The identification information of the terminal.
  • the method before the CU sends the second interface message to the S-DU, the method further includes: the CU sends a fourth interface message to the S-DU, and the fourth The interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell, The target cell is the serving cell after the terminal L1/L2 is switched; 4)
  • the candidate cell is the RACH resources or SRS resources allocated by the terminal.
  • the method further includes: the CU sends a fifth interface message to the T-DU, the fifth interface message is used to request the RACH resource or SRS resource, and the third interface message is used to request the RACH resource or SRS resource.
  • the five-interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell , the target cell is the serving cell after the terminal L1/L2 is switched; 4) Instruction information for requesting RACH resources or SRS resources.
  • the method further includes: the CU receiving a sixth interface message from the S-DU, the sixth interface message including at least one of the following: 1) Identity of the candidate cell Information; 2) L1 measurement results of the candidate cell; 3) Channel state information CSI measurement results of the candidate cell; 4) Identification information of the terminal; 5) Wherein, the candidate cell is a candidate for L1/L2 handover of the terminal community.
  • the method further includes: after the CU receives the first interface message or the downlink data delivery status indication from the S-DU, the CU starts sending downlink user data to the T-DU. It is to switch the data path in advance before the switch is completed to reduce the data plane delay.
  • the method further includes: after the CU receives the third interface message from the T-DU and determines that the L1/L2 handover is completed, starts sending downlink user data to the T-DU,
  • the purpose is to ensure that after the L1/L2 handover is completed, the T-DU can receive the downlink user data sent by the CU in time to schedule the UE in the new serving cell.
  • FIG. 5 is a schematic flowchart of the implementation of the switching method according to the embodiment of the present application, which can be applied to terminals. As shown in Figure 5, the method 500 includes the following steps.
  • S502 The terminal monitors the physical downlink control channel (PDCCH) of the T-DU to obtain the scheduling request sent by the T-DU.
  • PDCCH physical downlink control channel
  • the terminal monitors the PDCCH of the T-DU to obtain the scheduling request sent by the T-DU; if the terminal successfully receives the PDCCH containing the C-RNTI allocated by the target cell based on the scheduling request, then The terminal sends uplink data to the T-DU.
  • the embodiment of the present application helps the T-DU schedule the terminal to confirm handover completion or handover failure, which can avoid terminal L1/L2 handover failure and improve communication system performance.
  • the uplink data includes at least one of the following: 1) HARQ Acknowledgment (ACK) or Negative Acknowledgment (NACK); 2) CSI report; 3) Radio Resource Control ( Radio Resource Control (RRC) The reconfiguration completion message; 4) The index or identification associated with the RRC reconfiguration message applied by the terminal.
  • ACK HARQ Acknowledgment
  • NACK Negative Acknowledgment
  • RRC Radio Resource Control
  • the method further includes: if the terminal fails to successfully receive the PDCCH containing the C-RNTI allocated by the target cell within the second timer duration based on the scheduling request, the terminal confirms Switch failed.
  • S-DU notifies T-DU of handover initiation.
  • This embodiment includes the following steps:
  • Step (Step) 1 S-DU initiates L1/L2 handover or delivers L1/L2 handover command to UE.
  • Step 2 L1/L2 switching of Inter-DU is optional.
  • S-DU sends interface messages to CU, such as UE Context Modification Require message.
  • the CU After receiving the above interface message, the CU sends the interface message to the T-DU, such as the UE Context Modification Request message.
  • the above interface message is associated with the UE to be handed over.
  • the above interface message includes at least one of the following information elements (IE):
  • Handover initiation indication also known as indication information used to indicate L1/L2 handover initiation.
  • Identification information of the target cell includes, for example: target cell identity (Identity, ID), cell global identity (Cell Global Identity, CGI), physical cell identity (Physical Cell Identifier, PCI), etc.
  • T-DU can schedule the terminal multiple times within the duration of the first timer.
  • Step 1 and Step 2 are not mandatory, that is, the order of Step 1 and Step 2 can be adjusted, or initiated at the same time.
  • Step 3 T-DU schedules UE.
  • Scheduling can be at least one of the following behaviors:
  • the T-DU starts the first timer after initiating scheduling for the UE.
  • the T-DU can execute Step 3 after receiving the interface message from the CU in Step 2.
  • Step 4 T-DU successfully decodes the data carried by the PUCCH or PUSCH channel sent by the UE and confirms that the handover is completed; optionally, the T-DU sends an interface message, such as UE Context Modification Response, to the CU to indicate to the CU that the L1/L2 handover is completed. .
  • an interface message such as UE Context Modification Response
  • the CU sends an interface message to the S-DU, such as UE Context Modification Confirm, indicating to the S-DU L1/L2 switching is completed.
  • the interface message may contain at least one of the following:
  • Source cell ID CGI or PCI.
  • Step 5 If the T-DU fails to successfully decode the data carried by the PUCCH or PUSCH channel sent by the UE, the T-DU schedules the UE again until the number of scheduling times exceeds the maximum number of scheduling times, or the scheduling time exceeds the first timer duration.
  • the T-DU can also stop processing UE scheduling.
  • Step 6 If the number of times the T-DU schedules the UE exceeds the maximum number of times, or the scheduling time exceeds the first timer, the scheduling of the UE is stopped, and the T-DU confirms that the handover fails.
  • the T-DU sends an interface message to the CU, such as UE Context Modification Require, to indicate the L1/L2 handover failure to the CU; for inter-DU handover, optionally, the CU sends an interface message to the S-DU, such as UE Context Modification Confirm, indicating L1/L2 handover failure to S-DU.
  • the CU sends an interface message to the S-DU, such as UE Context Modification Confirm, indicating L1/L2 handover failure to S-DU.
  • the interface message may contain at least one of the following:
  • Source cell ID CGI or PCI.
  • Embodiment 1 The above content describes the steps performed on the network side.
  • this embodiment includes the following steps:
  • Step 1 The UE receives the L1/L2 handover command issued by the S-DU and uses the saved synchronous reconfiguration of the target cell or the synchronous reconfiguration of the target secondary cell group (Secondary Cell Group, SCG).
  • Step 2 The UE monitors the PDCCH of the T-DU, decodes the DCI and obtains the scheduling request sent by the T-DU, and the UE confirms that the handover is completed.
  • the scheduling request includes at least one of the following:
  • Step 3 The UE successfully receives the PDCCH containing the C-RNTI allocated by the target cell, then the UE sends uplink data to the T-DU, and the uplink data is carried through the PUCCH or PUSCH.
  • the data can be at least one of the following:
  • the UE if the UE does not successfully receive the PDCCH containing the C-RNTI allocated by the target cell within the second timer duration, the UE confirms that the handover fails.
  • the second timer duration has the following configuration methods:
  • the second timer may be started after the UE receives the L1/L2 switching command issued by the S-DU.
  • the S-DU sends the L1 measurement results of the candidate cells to the CU, and the CU modifies or releases the candidate cells based on the measurement results, or initiates an L3 handover.
  • This embodiment includes the following steps:
  • Step 1 S-DU receives the L1 measurement results reported by the UE.
  • Step 2 S-DU sends an interface message to CU, such as UE Context Modification Require message.
  • the message contains at least one of the following IEs:
  • the seventh interface message sending timing may be one of the following:
  • Periodically sent the period can be configured by the CU.
  • the S-DU is sent when it receives the L1 measurement result reported by the UE.
  • Step 3 CU performs configuration modification and deletion of candidate cells, or initiates L3 handover based on the L1 measurement results reported by S-DU.
  • the S-DU sends the L1 measurement result of the candidate cell and/or the CSI measurement result of the candidate cell to the T-DU, so that the T-DU can perform scheduling in time after the handover is completed.
  • This embodiment includes the following steps:
  • Step 1 The S-DU receives the L1 measurement results and/or CSI measurement results of the candidate cell reported by the UE.
  • Step 2 Inter-DU switching is optional.
  • the S-DU sends an interface message to the CU.
  • the interface message contains at least one of the following IEs:
  • L1 measurement results of the candidate cell such as Signal to Interference plus Noise Ratio (SINR), Signal Noise Ratio (SNR), Reference Signal Receiving Power (RSRP), Reference Signal receiving quality (Reference Signal Receiving Quality, RSRQ), etc.
  • SINR Signal to Interference plus Noise Ratio
  • SNR Signal Noise Ratio
  • RSRP Reference Signal Receiving Power
  • RSRQ Reference Signal receiving quality
  • CSI measurement results of the candidate cell such as Rank Indication (RI), Channel Quality Indicator (CQI), Channel State Information Reference Signal Resource Indicator (CSI-RS Resource Indicator, CRI), and Layer Indicator (Layer Indicator, LI), Pre-coding Matrix Indicator (PMI), etc.
  • RI Rank Indication
  • CQI Channel Quality Indicator
  • CRI Channel State Information Reference Signal Resource Indicator
  • CSI-RS Resource Indicator CRI
  • Layer Indicator Layer Indicator
  • PMI Pre-coding Matrix Indicator
  • the timing of sending the interface message may be:
  • Periodically sent the period can be configured by the CU.
  • the S-DU is sent when it receives the L1 measurement results and/or CSI measurement results reported by the UE.
  • the S-DU sends the above interface message when initiating L1/L2 handover or receiving HARQ feedback of L1/L2 handover, it can only send the CSI measurement results of the target cell without including the CSI measurements of other candidate cells. result.
  • Step 3 Inter-DU switching is optional.
  • the CU After receiving the interface message, the CU sends the interface message to the T-DU.
  • the interface message contains at least one of the following IEs:
  • Step 4 After the UE handover is completed, the T-DU makes scheduling decisions based on the CSI measurement results, and the T-DU performs L1/L2 handover decisions based on the L1 measurement results of the candidate cells.
  • the T-DU sends the TA of the UE in the candidate cell to the S-DU, thereby saving the uplink synchronization delay of the UE during handover execution.
  • This embodiment includes the following steps:
  • Step 0 Inter-DU handover is optional.
  • the T-DU sends an interface message to the CU.
  • the interface message contains the RACH resources or SRS resources allocated by the candidate cell for the UE.
  • the CU sends an interface message to the S-DU.
  • the message contains the candidate cell. RACH resources or SRS resources allocated by the UE.
  • the tenth interface message/eleventh interface message includes at least one of the following IEs:
  • Source cell ID CGI or PCI.
  • the S-DU sends an interface message to the CU.
  • the interface message includes a request for the candidate cell to allocate RACH resources or SRS resources to the UE; the CU sends an interface message to the T-DU.
  • the interface message includes a request for the candidate cell to allocate RACH resources or SRS resources to the UE.
  • the interface message contains at least one of the following IEs:
  • Source cell ID CGI or PCI.
  • Step 1 S-DU sends the RACH resources or SRS resources allocated to the UE by the candidate cell to the UE.
  • the RACH resources or SRS resources allocated by the candidate cell include at least one of the following:
  • the RS index of the candidate cell associated with the RACH resource or SRS resource such as ssb-Index or csi-RS-Index.
  • Step 1 T-DU obtains the TA value of the UE in the candidate cell based on the Preamble or SRS sent by the UE.
  • Step 2 Inter-DU switching is optional.
  • T-DU sends interface messages to CU, such as UE Context Modification Require message.
  • the interface message carries at least one of the following IEs:
  • Source cell ID CGI or PCI.
  • Step 3 Inter-DU switching is optional.
  • the CU sends an interface message to the S-DU, such as a UE Context Modification Request message.
  • the message carries at least one of the following IEs:
  • Source cell ID CGI or PCI.
  • Step 4 When S-DU sends the TA value of the candidate cell to the UE, or triggers L1/L2 handover,
  • the L1/L2 handover command carries the TA value of the target cell.
  • the L1/L2 handover command can be DCI or MAC CE.
  • the TA value can be the absolute TA value of the UE in the candidate cell, or it can be relative to the TA of the serving cell. The relative TA value of the value.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in Figure 6, terminal 600 includes the following modules.
  • the communication module 602 is configured to monitor the PDCCH of the T-DU to obtain the scheduling request sent by the T-DU.
  • the communication module 602 is also configured to send uplink data to the T-DU if the PDCCH containing the C-RNTI allocated by the target cell is successfully received based on the scheduling request.
  • the terminal 600 further includes a processing module.
  • the communication module monitors the PDCCH of the T-DU to obtain the scheduling request sent by the T-DU; if the PDCCH containing the C-RNTI allocated by the target cell is successfully received based on the scheduling request, the communication module sends a request to the T-DU.
  • the DU sends uplink data.
  • the embodiment of the present application helps the T-DU schedule the terminal to confirm the handover completion or handover failure, which can avoid the terminal L1/L2 handover failure and improve the performance of the communication system.
  • the uplink data includes at least one of the following: 1) Hybrid automatic repeat request confirmation response HARQ ACK or negative response NACK; 2) CSI report; 3) RRC reconfiguration completion message; 4) The index or identification associated with the RRC reconfiguration message applied by the terminal.
  • the communication module 602 is also configured to confirm that the handover fails if the PDCCH containing the C-RNTI allocated by the target cell is not successfully received within the second timer duration based on the scheduling request.
  • the terminal 600 can refer to the process corresponding to the method 500 of the embodiment of the present application, and each unit/module and the above-mentioned other operations and/or functions in the terminal 600 are respectively intended to implement the corresponding process in the method 500. And can achieve the same or equivalent technical effects. For the sake of simplicity, they will not be described again here.
  • the terminal in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or may be a component in the electronic device, such as an integrated circuit or chip.
  • terminals may include but are not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., which are not specifically limited in the embodiment of this application.
  • NAS Network Attached Storage
  • FIG 7 is a schematic structural diagram of a first network side device according to an embodiment of the present application.
  • the first network side device may correspond to an S-DU in other embodiments.
  • the first network side device 700 includes the following modules.
  • Communication module 702 used to initiate L1/L2 handover.
  • the communication module 702 is also configured to perform at least one of the following: sending a first interface message to the T-DU and receiving a second interface message; wherein the first interface message is used to indicate that the T-DU is The terminal performs scheduling; the second interface message includes a candidate cell timing advance TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • the first network side device 700 further includes a processing module.
  • the first network side device initiates L1/L2 handover and performs at least one of the following: sending a first interface message to the T-DU and receiving a second interface message; wherein the first interface message is used to indicate The T-DU schedules the terminal to confirm handover completion or handover failure, which can avoid terminal L1/L2 handover failure and improve communication system performance; the second interface message includes a candidate cell TA value, and the candidate cell TA value is Uplink synchronization during terminal handover, thereby saving the uplink synchronization delay when the terminal performs handover, avoiding terminal L1/L2 handover failure, and improving communication system performance.
  • the first interface message includes at least one of the following: 1) indication information for indicating L1/L2 handover initiation; 2) identification information of the target cell; 3) identification information associated with the target cell.
  • the transmission configuration indicates the TCI status; 4) the maximum number of times the T-DU schedules the terminal; 5) the duration of the first timer, and the T-DU schedules the terminal during the running of the first timer; wherein , the target cell is the serving cell after the terminal L1/L2 is switched.
  • the communication module 702 is also configured to receive a third interface message.
  • the third interface message is sent by the T-DU after confirming that the handover is completed or the handover fails.
  • the three-interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell , the target cell is the serving cell after the terminal L1/L2 handover; 4) an index or identifier associated with the applied radio resource control RRC reconfiguration message; 5) used to indicate L1/L2 handover completion or handover failure instructions.
  • the second interface message also includes at least one of the following: 1) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 2) candidate The identification information of the cell, the candidate cell is the candidate cell for handover of the terminal L1/L2; 3) The identification information of the terminal.
  • the communication module 702 is also configured to send RACH resources or resources to the terminal, where the RACH resources or SRS resources are allocated by the candidate cell to the terminal; wherein, the RACH Resources or SRS resources are used to obtain the TA value of the candidate cell.
  • the communication module 702 is also configured to receive a fourth interface message, where the fourth interface message includes at least one of the following: 1) identification information of the terminal; 2) source cell information. Identification information, the source cell is the serving cell before the terminal L1/L2 is switched; 3) Identification information of the target cell, the target cell is the serving cell after the terminal L1/L2 is switched; 4) The candidate cell is RACH resources or SRS resources allocated by the terminal.
  • the communication module 702 is also used to send a fifth interface message.
  • the fifth interface message is used to request the RACH resource or SRS resource.
  • the fifth interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell, so The target cell is the serving cell after the terminal L1/L2 is switched; 4) Instruction information for requesting RACH resources or SRS resources.
  • the RACH resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, used uplink carrier, RS index of associated candidate cell, associated candidate cell Identification information, PRACH mask index, Preamble index;
  • the SRS resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, uplink carrier used by the terminal, RS of the associated candidate cell Index, identification information of the associated candidate cell.
  • the communication module 702 is also configured to send the TA value of the candidate cell to the terminal; or, carry the TA value of the target cell in the L1/L2 handover command, and the target cell The cell is the serving cell after the terminal L1/L2 is switched.
  • the communication module 702 is also configured to send a sixth interface message to the T-DU and/or CU, where the sixth interface message includes at least one of the following: 1) Candidate cell identification information; 2) L1 measurement results of the candidate cell; 3) CSI measurement results of the candidate cell; 4) identification information of the terminal; wherein the candidate cell is a candidate cell for L1/L2 handover of the terminal.
  • the timing of sending the sixth interface message is one of the following: 1) periodically sent; 2) sent when L1/L2 switching is initiated or an L1/L2 switching command is issued; 3) received Sent when HARQ feedback of the L1/L2 switching command is sent; 4) Sent when the L1 measurement results reported by the terminal are received; 5) Sent when the CSI measurement results reported by the terminal are received.
  • the timing of sending the sixth interface message is when initiating L1/L2 handover or when receiving HARQ feedback of the L1/L2 handover command; wherein, the CSI measurement result of the candidate cell is The CSI measurement result of the target cell, which is the serving cell after the terminal L1/L2 is switched.
  • the first network side device 700 can refer to the process of the method 200 corresponding to the embodiment of the present application, and each unit/module in the first network side device 700 and the above-mentioned other operations and/or functions are respectively for The corresponding processes in method 200 are implemented and can achieve the same or equivalent technical effects. For the sake of simplicity, they will not be described again here.
  • FIG 8 is a schematic structural diagram of a second network side device according to an embodiment of the present application.
  • the second network side device may correspond to a T-DU in other embodiments.
  • the second network side device 800 includes the following modules.
  • the communication module 802 is configured to perform at least one of the following: receiving a first interface message and sending a second interface message to the S-DU; wherein the first interface message is used to instruct the second network side device to The terminal performs scheduling; the second interface message includes a candidate cell TA value, the candidate cell TA value is used to send the S-DU to the terminal, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • the second network side device 800 further includes a processing module.
  • the second network side device performs at least one of the following: receiving a first interface message and sending a second interface message to the S-DU; wherein the first interface message is used to instruct the second network side device to
  • the terminal performs scheduling to confirm handover completion or handover failure, which can avoid terminal L1/L2 handover failure and improve communication system performance;
  • the second interface message includes a candidate cell TA value, and the candidate cell TA value is used when the terminal switches. Uplink synchronization, thereby saving the uplink synchronization delay when the terminal performs handover, avoiding terminal L1/L2 handover failure, and improving communication system performance.
  • the first interface message includes at least one of the following: 1) indication information for indicating L1/L2 handover initiation; 2) identification information of the target cell; 3) identification information associated with the target cell. TCI state; 4) the maximum number of times the T-DU schedules the terminal; 5) the duration of the first timer, the T-DU schedules the terminal during the running of the first timer; wherein, the The target cell is the serving cell after the terminal L1/L2 is switched.
  • the second network side device's scheduling of the terminal includes at least one of the following: 1) sending an uplink grant to the terminal; 2) triggering the terminal to perform aperiodic CSI reporting.
  • the method further includes: if the T-DU successfully decodes the data carried by the uplink channel sent by the terminal, confirming that the handover is completed.
  • the communication module 802 is also configured to: if the data carried by the uplink channel sent by the terminal is not successfully decoded, schedule the terminal again until the number of scheduling times exceeds the number of times the terminal is scheduled. The maximum number of times, or the scheduling time exceeds the first timer duration.
  • the communication module 802 is also configured to: if the number of times of scheduling the terminal reaches or exceeds the maximum number of times of scheduling the terminal, or the scheduling time exceeds the first timer duration, then Stop scheduling the terminal and confirm that the handover fails.
  • the communication module 802 is also configured to send a third interface message.
  • the third interface message is sent by the second network side device after confirming that the handover is completed or the handover fails.
  • the third interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell Identification information, the target cell is the serving cell after the terminal L1/L2 handover; 4) The index or identity associated with the applied RRC reconfiguration message; 5) Used to indicate the L1/L2 handover completion or handover failure Instructions.
  • the second interface message also includes at least one of the following: 1) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 2) candidate Identification information of the selected cell, and the candidate cell is a candidate cell for L1/L2 handover of the terminal; 3) Identification information of the terminal.
  • the communication module 802 is also configured to obtain the TA value of the candidate cell according to the Preamble or SRS sent by the terminal.
  • the communication module 802 is also configured to send a fourth interface message, where the fourth interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell Identification information, the source cell is the serving cell before the terminal L1/L2 is switched; 3) Identification information of the target cell, the target cell is the serving cell after the terminal L1/L2 is switched; 4)
  • the candidate cell is RACH resources or SRS resources allocated by the terminal.
  • the communication module 802 is also configured to receive a fifth interface message, the fifth interface message is used to request the RACH resource or SRS resource, the fifth interface message includes at least the following: One: 1) Identification information of the terminal; 2) Identification information of the source cell, the source cell is the serving cell before the terminal L1/L2 handover; 3) Identification information of the target cell, the target cell is The serving cell after the terminal L1/L2 is switched; 4) Instruction information for requesting RACH resources or SRS resources.
  • the RACH resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, used uplink carrier, RS index of associated candidate cell, associated candidate cell Identification information, PRACH mask index, Preamble index;
  • the SRS resource includes at least one of the following: frequency point, time-frequency domain position, transmission cycle, offset, uplink carrier used by the terminal, RS of the associated candidate cell Index, identification information of the associated candidate cell.
  • the communication module 802 is also configured to receive a sixth interface message, where the sixth interface message includes at least one of the following: 1) identification information of the candidate cell; 2) L1 of the candidate cell Measurement results; 3) CSI measurement results of candidate cells; 4) Identification information of the terminal; wherein the candidate cell is a candidate cell for L1/L2 handover of the terminal.
  • the second network side device 800 can refer to the process of the method 300 corresponding to the embodiment of the present application, and each unit/module in the second network side device 800 and the above-mentioned other operations and/or functions are respectively for The corresponding processes in method 300 are implemented and can achieve the same or equivalent technical effects. For the sake of simplicity, they will not be described again here.
  • FIG 9 is a schematic structural diagram of a third network side device according to an embodiment of the present application.
  • the third network side device may correspond to a CU in other embodiments.
  • the third network side device 900 includes the following modules.
  • the communication module 902 is configured to perform at least one of the following: sending a first interface message to the T-DU, sending a second interface message to the S-DU, receiving the first interface message sent by the S-DU, and receiving a third interface message sent by the T-DU. Three interface messages; wherein the first interface message is used to instruct the T-DU to perform Scheduling; the second interface message includes a candidate cell TA value, and the candidate cell TA value is used for uplink synchronization when the terminal switches.
  • the third network side device 900 further includes a processing module.
  • the third network side device performs at least one of the following: sending a first interface message to the T-DU and sending a second interface message to the S-DU; wherein the first interface message is used to indicate the T-DU DU schedules the terminal to confirm handover completion or handover failure, which can avoid terminal L1/L2 handover failure and improve communication system performance; the second interface message includes the candidate cell TA value, and the candidate cell TA value is used when the terminal switches.
  • Uplink synchronization thereby saving the uplink synchronization delay when the terminal performs handover, avoiding terminal L1/L2 handover failure, and improving communication system performance.
  • the first interface message includes at least one of the following: 1) indication information for indicating L1/L2 handover initiation; 2) identification information of the target cell; 3) identification information associated with the target cell.
  • the transmission configuration indicates the TCI status; 4) the maximum number of times the T-DU schedules the terminal; 5) the duration of the first timer, and the T-DU schedules the terminal during the running of the first timer; wherein , the target cell is the serving cell after the terminal L1/L2 is switched.
  • the communication module 902 is also configured to send a third interface message to the S-DU.
  • the third interface message is the T-DU's response after confirming that the handover is completed or the handover fails.
  • the third interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, where the source cell is the serving cell before the terminal L1/L2 handover; 3 ) Identification information of the target cell, which is the serving cell after the terminal L1/L2 handover; 4) Index or identification associated with the applied RRC reconfiguration message; 5) Used to indicate the completion of the L1/L2 handover Or an indication of switching failure.
  • the second interface message also includes at least one of the following: 1) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 2) candidate The identification information of the cell, the candidate cell is the candidate cell for handover of the terminal L1/L2; 3) The identification information of the terminal.
  • the communication module 902 is also configured to send a fourth interface message to the S-DU, where the fourth interface message includes at least one of the following: 1) Identification information of the terminal ; 2) Identification information of the source cell, the source cell is the serving cell before the terminal L1/L2 is switched; 3) Identification information of the target cell, the target cell is the serving cell after the terminal L1/L2 is switched ;4) RACH resources or SRS resources allocated by the candidate cell to the terminal.
  • the communication module 902 is further configured to send a fifth interface message to the T-DU, where the fifth interface message is used to request the RACH resource or SRS resource.
  • the five-interface message includes at least one of the following: 1) identification information of the terminal; 2) identification information of the source cell, which is the serving cell before the terminal L1/L2 handover; 3) identification information of the target cell , the target cell is the serving cell after the terminal L1/L2 is switched; 4) used to request Indication information of RACH resources or SRS resources.
  • the communication module 902 is also configured to receive a sixth interface message from the S-DU, where the sixth interface message includes at least one of the following: 1) Identity of the candidate cell Information; 2) L1 measurement results of the candidate cell; 3) Channel state information CSI measurement results of the candidate cell; 4) Identification information of the terminal; 5) Wherein, the candidate cell is a candidate for L1/L2 handover of the terminal community.
  • the third network side device 900 can refer to the process corresponding to the method 400 of the embodiment of the present application, and each unit/module in the third network side device 900 and the above-mentioned other operations and/or functions are respectively for The corresponding processes in method 400 are implemented and can achieve the same or equivalent technical effects. For the sake of simplicity, they will not be described again here.
  • this embodiment of the present application also provides a communication device 1000, which includes a processor 1001 and a memory 1002.
  • the memory 1002 stores programs or instructions that can be run on the processor 1001, such as , when the communication device 1000 is a terminal, when the program or instruction is executed by the processor 1001, each step of the above switching method embodiment is implemented, and the same technical effect can be achieved.
  • the communication device 1000 is a network-side device, when the program or instruction is executed by the processor 1001, each step of the above switching method embodiment is implemented, and the same technical effect can be achieved. To avoid duplication, the details are not repeated here.
  • Embodiments of the present application also provide a terminal, including a processor and a communication interface.
  • the communication interface is used to monitor the PDCCH of a T-DU to obtain the scheduling request sent by the T-DU; if the scheduling request is successfully received based on the target cell allocation, PDCCH of the C-RNTI, then the uplink data is sent to the T-DU.
  • This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment.
  • Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect.
  • FIG. 11 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.
  • the terminal 1100 includes but is not limited to: a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, a sensor 1105, a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109, a processor 1110, etc. At least some parts.
  • the terminal 1100 may also include a power supply (such as a battery) that supplies power to various components.
  • the power supply may be logically connected to the processor 1110 through a power management system, thereby managing charging, discharging, and power consumption through the power management system. Management and other functions.
  • the terminal structure shown in FIG. 11 does not constitute a limitation on the terminal.
  • the terminal may include more or fewer components than shown in the figure, or some components may be combined or arranged differently, which will not be described again here.
  • the input unit 1104 may include a graphics processor (Graphics Processing Unit, GPU) 11041 and a microphone 11042.
  • the graphics processor 11041 is responsible for the image capture device (GPU) in the video capture mode or the image capture mode. Process the image data of still pictures or videos obtained by cameras (such as cameras).
  • the display unit 1106 may include a display panel 11061, The display panel 11061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like.
  • the user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072 .
  • Touch panel 11071 also called touch screen.
  • the touch panel 11071 may include two parts: a touch detection device and a touch controller.
  • Other input devices 11072 may include but are not limited to physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described again here.
  • the radio frequency unit 1101 after receiving downlink data from the network side device, the radio frequency unit 1101 can transmit it to the processor 1110 for processing; in addition, the radio frequency unit 1101 can send uplink data to the network side device.
  • the radio frequency unit 1101 includes, but is not limited to, an antenna, amplifier, transceiver, coupler, low noise amplifier, duplexer, etc.
  • Memory 1109 may be used to store software programs or instructions as well as various data.
  • the memory 1109 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required for at least one function (such as a sound playback function, Image playback function, etc.) etc.
  • memory 1109 may include volatile memory or nonvolatile memory, or memory 1109 may include both volatile and nonvolatile memory.
  • non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically removable memory.
  • Volatile memory can be random access memory (Random Access Memory, RAM), 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, DDRSDRAM), 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, DRRAM).
  • RAM Random Access Memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory Synchronous DRAM, SDRAM
  • Double data rate synchronous dynamic random access memory Double Data Rate SDRAM, DDRSDRAM
  • Enhanced SDRAM, ESDRAM synchronous link dynamic random access memory
  • Synch link DRAM synchronous link dynamic random access memory
  • SLDRAM direct memory bus random access memory
  • the processor 1110 may include one or more processing units; optionally, the processor 1110 integrates an application processor and a modem processor, where the application processor mainly handles operations related to the operating system, user interface, application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the above modem processor may not be integrated into the processor 1110.
  • the radio frequency unit 1101 can be used to monitor the PDCCH of the T-DU to obtain the scheduling request sent by the T-DU; if the PDCCH containing the C-RNTI allocated by the target cell is successfully received based on the scheduling request, send the PDCCH to the T-DU.
  • -DU sends uplink data.
  • the terminal monitors the PDCCH of the T-DU to obtain the scheduling request sent by the T-DU; if it successfully receives the PDCCH containing the C-RNTI allocated by the target cell based on the scheduling request, the terminal sends the request to the T-DU.
  • the embodiment of the present application is helpful for the T-DU to schedule the terminal to confirm the handover completion or handover failure, which can avoid the terminal L1/L2 handover failure and improve the performance of the communication system.
  • the terminal 1100 provided by the embodiment of the present application can also implement each process of the above-mentioned switching method embodiment, and can achieve the same technical effect. To avoid duplication, the details will not be described here.
  • An embodiment of the present application also provides a network side device, including a processor and a communication interface.
  • the communication interface is used to execute the steps of the method described in any one of Figures 2 to 4.
  • This network-side device embodiment corresponds to the above-mentioned network-side device method embodiment.
  • Each implementation process and implementation manner of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.
  • the embodiment of the present application also provides a network side device.
  • the network side device 1200 includes: an antenna 121 , a radio frequency device 122 , a baseband device 123 , a processor 124 and a memory 125 .
  • the antenna 121 is connected to the radio frequency device 122 .
  • the radio frequency device 122 receives information through the antenna 121 and sends the received information to the baseband device 123 for processing.
  • the baseband device 123 processes the information to be sent and sends it to the radio frequency device 122.
  • the radio frequency device 122 processes the received information and then sends it out through the antenna 121.
  • the method performed by the network side device in the above embodiment can be implemented in the baseband device 123, which includes a baseband processor.
  • the baseband device 123 may include, for example, at least one baseband board on which multiple chips are disposed, as shown in FIG. Program to perform the network device operations shown in the above method embodiments.
  • the network side device may also include a network interface 126, which is, for example, a common public radio interface (CPRI).
  • a network interface 126 which is, for example, a common public radio interface (CPRI).
  • CPRI common public radio interface
  • the network side device 1200 in the embodiment of the present application also includes: instructions or programs stored in the memory 125 and executable on the processor 124.
  • the processor 124 calls the instructions or programs in the memory 125 to execute Figures 7 to 9 The method of executing each module shown in any item and achieving the same technical effect will not be repeated here to avoid repetition.
  • Embodiments of the present application also provide a readable storage medium.
  • Programs or instructions are stored on the readable storage medium.
  • the program or instructions are executed by a processor, each process of the above switching method embodiment is implemented and the same can be achieved. To avoid repetition, the technical effects will not be repeated here.
  • the processor is the processor in the terminal described in the above embodiment.
  • the readable storage medium includes computer readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disk, etc.
  • An embodiment of the present application further provides a chip.
  • the chip includes a processor and a communication interface.
  • the communication interface is coupled to the processor.
  • the processor is used to run programs or instructions to implement each of the above switching method embodiments. The process can achieve the same technical effect. To avoid repetition, it will not be described again here.
  • chips mentioned in the embodiments of this application may also be called system-on-chip, system-on-a-chip, system-on-chip or system-on-chip, etc.
  • Embodiments of the present application further provide a computer program/program product.
  • the computer program/program product is stored in a storage medium.
  • the computer program/program product is executed by at least one processor to implement the above switching method embodiment.
  • Each process can achieve the same technical effect. To avoid duplication, it will not be described again here.
  • Embodiments of the present application also provide an L1/L2 switching system, including: a terminal and a network side device.
  • the terminal can be used to perform the steps of the switching method as described above.
  • the network side device can be used to perform the steps of the handover method as described above. Steps to switch methods.
  • the methods of the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is better. implementation.
  • the technical solution of the present application can be embodied in the form of a computer software product that is essentially or contributes to the existing technology.
  • the computer software product is stored in a storage medium (such as ROM/RAM, disk , CD), including several instructions to cause a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in various embodiments of this application.

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Abstract

本申请实施例公开了一种切换方法、终端及网络侧设备，属于通信技术领域，本申请实施例的切换方法包括：S-DU发起L1/L2切换；所述S-DU执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。

Description

切换方法、终端及网络侧设备
交叉引用
本申请要求在2022年05月09日提交中国专利局、申请号为202210499849.2、发明名称为“切换方法、终端及网络侧设备”的中国专利申请的优先权，和2022年07月29日提交中国专利局、申请号为202210910523.4、发明名称为“切换方法、终端及网络侧设备”的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请属于通信技术领域，具体涉及一种切换方法、终端及网络侧设备。
背景技术
接入网设备(如NR节点(NR Node B，gNB))可以包括中心单元(Centralized Unit，CU)和分布式单元(Distributed Unit，DU)，CU和DU通过F1接口连接。一个接入网设备通常仅包含一个CU，包含一个或多个DU，一个DU对应1个或多个小区(cell)。
L1/L2切换是DU基于L1测量结果进行切换判决，可能采用无随机接入(rach-less)的方案。然而，相关技术中并没有提供L1/L2切换相关的具体方案，容易导致终端L1/L2切换失败而影响通信性能。
发明内容
本申请实施例提供一种切换方法、终端及网络侧设备，能够解决因终端L1/L2切换失败而影响通信性能的问题。
第一方面，提供了一种切换方法，包括：S-DU发起L1/L2切换；所述S-DU执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
第二方面，提供了一种切换方法，包括：T-DU执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述S-DU发送至终端，所述候选小区TA值用于终端切换时的上行同步。
第三方面，提供了一种切换方法，包括：CU执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息 用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
第四方面，提供了一种切换方法，包括：终端监听T-DU的PDCCH得到所述T-DU发送的调度请求；若所述终端基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则所述终端向所述T-DU发送上行数据。
第五方面，提供了一种第一网络侧设备，包括：通信模块，用于发起L1/L2切换；所述通信模块，还用于执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
第六方面，提供了一种第二网络侧设备，包括：通信模块，用于执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述第二网络侧设备对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述S-DU发送至终端，所述候选小区TA值用于终端切换时的上行同步。
第七方面，提供了一种第三网络侧设备，包括：通信模块，用于执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
第八方面，提供了一种终端，包括：通信模块，用于监听T-DU的PDCCH得到所述T-DU发送的调度请求；所述通信模块，还用于若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据。
第九方面，提供了一种终端，该终端包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如第四方面所述的方法的步骤。
第十方面，提供了一种终端，包括处理器及通信接口，其中，所述通信接口用于监听T-DU的PDCCH得到所述T-DU发送的调度请求；若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据。
第十一方面，提供了一种网络侧设备，该网络侧设备包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如第一方面至第三方面任一项所述的方法的步骤。
第十二方面，提供了一种网络侧设备，包括处理器及通信接口，其中，所述处理器或，所述通信接口用于执行如第一方面至第三方面任一项所述的 方法的步骤。
第十三方面，提供了一种切换系统，包括：终端及网络侧设备，所述终端可用于执行如第四方面所述的方法的步骤，所述网络侧设备可用于执行如第一方面至第三方面任一项所述的方法的步骤。
第十四方面，提供了一种可读存储介质，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时实现如第一方面至第四方面任一项所述的方法的步骤。
第十五方面，提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现如第一方面至第四方面任一项所述的方法的步骤。
第十六方面，提供了一种计算机程序/程序产品，所述计算机程序/程序产品被存储在存储介质中，所述计算机程序/程序产品被至少一个处理器执行以实现如第一方面至第四方面任一项所述的方法的步骤。
在本申请实施例中，S-DU发起L1/L2切换及执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
附图说明
图1是根据本申请实施例的无线通信系统的示意图；
图2是根据本申请实施例的切换方法的示意性流程图；
图3是根据本申请实施例的切换方法的示意性流程图；
图4是根据本申请实施例的切换方法的示意性流程图；
图5是根据本申请实施例的切换方法的示意性流程图；
图6是根据本申请实施例的终端的结构示意图；
图7是根据本申请实施例的第一网络侧设备的结构示意图；
图8是根据本申请实施例的第二网络侧设备的结构示意图；
图9是根据本申请实施例的第三网络侧设备的结构示意图；
图10是根据本申请实施例的通信设备的结构示意图；
图11是根据本申请实施例的终端的结构示意图；
图12是根据本申请实施例的网络侧设备的结构示意图。
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清楚描述，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。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”所区别的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”一般表示前后关联对象是一种“或”的关系。
值得指出的是，本申请实施例所描述的技术不限于长期演进型(Long Term Evolution，LTE)/LTE的演进(LTE-Advanced，LTE-A)系统，还可用于其他无线通信系统，诸如码分多址(Code Division Multiple Access，CDMA)、时分多址(Time Division Multiple Access，TDMA)、频分多址(Frequency Division Multiple Access，FDMA)、正交频分多址(Orthogonal Frequency Division Multiple Access，OFDMA)、单载波频分多址(Single-carrier Frequency Division Multiple Access，SC-FDMA)和其他系统。本申请实施例中的术语“系统”和“网络”常被可互换地使用，所描述的技术既可用于以上提及的系统和无线电技术，也可用于其他系统和无线电技术。以下描述出于示例目的描述了新空口(New Radio，NR)系统，并且在以下大部分描述中使用NR术语，但是这些技术也可应用于NR系统应用以外的应用，如第6代(6th Generation，6G)通信系统。
图1示出本申请实施例可应用的一种无线通信系统的框图。无线通信系统包括终端11和网络侧设备12。其中，终端11可以是手机、平板电脑(Tablet Personal Computer)、膝上型电脑(Laptop Computer)或称为笔记本电脑、个人数字助理(Personal Digital Assistant，PDA)、掌上电脑、上网本、超级移动个人计算机(ultra-mobile personal computer，UMPC)、移动上网装置(Mobile Internet Device，MID)、增强现实(augmented reality，AR)/虚拟现实(virtual reality，VR)设备、机器人、可穿戴式设备(Wearable Device)、车载设备(Vehicle User Equipment，VUE)、行人终端(Pedestrian User Equipment，PUE)、智能家居(具有无线通信功能的家居设备，如冰箱、电视、洗衣机或者家具等)、游戏机、个人计算机(personal computer，PC)、柜员机或者自助机等终端侧设备，可穿戴式设备包括：智能手表、智能手环、智能耳机、智能眼镜、智能首饰(智能手镯、智能手链、智能戒指、智能项链、智能脚镯、智能脚链 等)、智能腕带、智能服装等。需要说明的是，在本申请实施例并不限定终端11的具体类型。网络侧设备12可以包括接入网设备或核心网设备，其中，接入网设备也可以称为无线接入网设备、无线接入网(Radio Access Network，RAN)、无线接入网功能或无线接入网单元。接入网设备可以包括基站、无线局域网(Wireless Local Area Network，WLAN)接入点或无线保真(Wireless Fidelity，WiFi)节点等，基站可被称为节点B、演进节点B(eNB)、接入点、基收发机站(Base Transceiver Station，BTS)、无线电基站、无线电收发机、基本服务集(Basic Service Set，BSS)、扩展服务集(Extended Service Set，ESS)、家用B节点、家用演进型B节点、发送接收点(Transmission Reception Point，TRP)或所述领域中其他某个合适的术语，只要达到相同的技术效果，所述基站不限于特定技术词汇，需要说明的是，在本申请实施例中仅以NR系统中的基站为例进行介绍，并不限定基站的具体类型。
下面结合附图，通过一些实施例及其应用场景对本申请实施例提供的切换方法进行详细地说明。
如图2所示，本申请实施例提供一种切换方法200，该方法可以由源分布式单元(Source-Distributed Unit，S-DU)执行，换言之，该方法可以由安装在S-DU的软件或硬件来执行，该方法包括如下步骤。
S202：S-DU发起L1/L2切换。
该实施例中，所述S-DU是终端L1/L2切换前的服务网络侧设备，后续提到的T-DU是所述终端L1/L2切换后的服务网络侧设备。本申请各个实施例可以应用在无随机接入(rach-less)的场景中，还可以应用在非rach-less场景中。
该步骤S-DU发起L1/L2切换例如包括：S-DU向终端下发L1/L2切换命令。
S204：所述S-DU执行如下至少之一：向目标分布式单元(Target-Distributed Unit，T-DU)发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区定时提前(Timing Advance，TA)值，所述候选小区TA值用于终端切换时的上行同步。
需要说明的是，该实施例对S202和S204的发生先后顺序不做强制限定，即S202和S204的顺序可以调整，还可以同时发起。
可选地，所述第一接口消息用于通知T-DU切换发起及待切换的目标小区。
可选地，所述第一接口消息包括如下至少之一：1)用于指示L1/L2切换发起的指示信息；2)目标小区的标识信息，所述目标小区是所述终端L1/L2 切换后的服务小区；3)与目标小区关联的传输配置指示(Transmission Configuration Indicator，TCI)状态，所述目标小区是所述终端L1/L2切换后的服务小区；4)所述T-DU调度所述终端的最大次数；5)第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端，可以理解，T-DU在对终端发起首次调度后可以启动第一定时器；在第一定时器运行期间，若调度终端失败，T-DU可以再次对终端进行调度；若第一定时器超时，则T-DU可以不再调度终端。
S204例如，S-DU向中心单元(Centralized Unit，CU)发送第一接口消息，第一接口消息例如可以是终端上下文修改要求(UE Context Modification Require)消息；CU收到第一接口消息后向T-DU发送第一接口消息，如终端上下文修改请求(UE Context Modification Request)消息，上述第一接口消息与待切换的终端相关联。
S204又例如，S-DU向CU发送第一接口消息并向CU发送下行数据传输状态指示(Downlink Data Delivery Status)，目的是将在S-DU未成功传输的下行数据包告知CU，以便CU发给T-DU继续传输。
该实施例中，T-DU接收到第一接口消息后可以对终端进行调度，例如，发送上行调度(UL Grant)或触发非周期信道状态信息(Channel State Information，CSI)上报等，所述T-DU对终端进行调度的目的可以是用于确认切换完成或切换失败。若T-DU对终端进行调度后，成功解码终端发送的物理上行控制信道(Physical Uplink Control Channel，PUCCH)或物理上行共享信道(Physical Uplink Shared Channel，PUSCH)信道携带的数据，则确认切换完成；若T-DU未成功解码终端发送的PUCCH或PUSCH信道携带的数据，则T-DU可以再次调度终端，直到调度次数超过最大调度次数，或调度时间超过第一定时器时长。可选地，若T-DU对终端的调度次数超过最大调度次数，或调度时间超过第一定时器时长，则可以停止对终端的调度，T-DU确认切换失败。
该实施例可以是跨DU(inter-DU)的L1/L2切换，切换执行可以是无随机接入(rach-less)，T-DU可以通过S-DU发送的第一接口消息得到L1/L2切换的时间以及切换的目标小区，从而调度终端以确认完成，避免终端L1/L2切换失败，提升通信系统性能。
S204又例如，T-DU向CU发送接口消息，如UE Context Modification Require消息，消息携带候选小区TA值等；CU向S-DU发送第二接口消息，如UE Context Modification Request消息，该第二接口消息携带候选小区TA值。该实施例中，T-DU将终端在候选小区的TA值发给S-DU，S-DU发送给终端以获取在目标小区的上行同步，从而节省终端在切换执行时上行同步的 时延，避免终端L1/L2切换失败，提升通信系统性能。
该实施例中，对于inter-DU的L1/L2切换，S-DU可以通过第二接口消息得到终端在目标小区的TA信息，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
本申请实施例提供的切换方法，S-DU发起L1/L2切换及执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，实施例200中，所述S-DU发送第一接口消息之后，所述方法还包括：所述S-DU接收第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)和被应用的无线资源控制(Radio Resource Control，RRC)重配置消息关联的索引或标识；5)用于指示L1/L2切换完成或切换失败的指示信息。
该实施例中，T-DU在确认切换成功或切换失败之后，可以向CU发送接口消息，如UE Context Modification Require消息，向CU指示L1/L2切换成功或切换失败；这样，CU可以向S-DU发送第三接口消息，如UE Context Modification Request消息。该实施例有利于S-DU确认终端切换完成或切换失败。
可选地，作为一个实施例，实施例200中提到的所述第二接口消息还包括如下至少之一：1)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；2)候选小区的标识信息，所述候选小区是所述终端L1/L2切换的候选小区；3)所述终端的标识信息。
可选地，作为一个实施例，所述S-DU接收第二接口消息之前，所述方法还包括：所述S-DU向所述终端发送随机接入信道(Random Access Channel，RACH)资源(如Preamble)或探测参考信号探测参考信号(Sounding Reference Signal，SRS)资源，所述RACH资源或SRS资源是候选小区为所述终端分配的；其中，所述RACH资源或SRS资源用于获取所述候选小区TA值。
该实施例中，S-DU向终端发送RACH资源或SRS资源，T-DU根据终端发送的Preamble或SRS获取终端在候选小区的TA值，T-DU将候选小区 的TA值发送给S-DU，S-DU再发送给终端。该实施例便于T-DU获取终端在候选小区的TA值。
可选地，作为一个实施例，所述S-DU向所述终端发送RACH资源或SRS资源之前，所述方法还包括：所述S-DU接收第四接口消息，所述第四接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)候选小区为所述终端分配的RACH资源或SRS资源。该实施例中，S-DU可以获取到候选小区为所述终端分配的RACH资源或SRS资源，从而还可以将该RACH资源或SRS资源指示给终端，便于T-DU根据终端发送的Preamble或SRS获取终端在候选小区的TA值。
该实施例中，T-DU向CU发送接口消息，接口消息中包含候选小区为终端分配的RACH资源或SRS资源等；CU向S-DU发送第四接口消息，包含候选小区为终端分配的RACH资源或SRS资源等。
可选地，作为一个实施例，所述S-DU接收第四接口消息之前，所述方法还包括：所述S-DU发送第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)用于请求RACH资源或SRS资源的指示信息。
该实施例中，S-DU向CU发送第五接口消息，第五接口消息中包含用于请求RACH资源或SRS资源的指示信息等；CU向T-DU发送接口消息，包含用于请求RACH资源或SRS资源的指示信息等。该实施例通过为终端请求RACH资源或SRS资源，便于T-DU根据终端发送的Preamble或SRS获取终端在候选小区的TA值。
可选地，作为一个实施例，所述RACH资源包括如下至少之一：频点，时频域位置，发送周期，偏移，使用的上行载波，关联的候选小区的参考信号(Reference Signal，RS)索引，关联的候选小区的标识信息，物理随机接入信道(Physical Random Access Channel，PRACH)掩码索引，Preamble索引；所述SRS资源包括如下至少之一：频点，时频域位置，发送周期，偏移，所述终端使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息。
可选地，作为一个实施例，所述S-DU接收第二接口消息之后，所述方法还包括：所述S-DU将所述候选小区TA值发送给所述终端；或者，所述S-DU在L1/L2切换命令中携带目标小区的TA值，所述目标小区是所述终端 L1/L2切换后的服务小区。
该实施例中，S-DU将候选小区TA值发送给终端，或触发L1/L2切换时，在L1/L2切换命令中携带目标小区的TA值，所述L1/L2切换命令可以是下行控制信息(Downlink Control Information，DCI)或媒体接入控制控制单元(Media Access Control Control Element，MAC CE)，所述候选小区TA值可以是终端在候选小区的绝对TA值，也可以是相对于服务小区TA值的相对TA值。
该实施例中，所述候选小区TA值用于终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述方法还包括：所述S-DU向所述T-DU和/或中心单元(CU)发送第六接口消息，所述第六接口消息包括如下至少之一：1)候选小区的标识信息；2)候选小区的L1测量结果；3)候选小区的信道状态信息(Channel State Information，CSI)测量结果；4)所述终端的标识信息；其中，所述候选小区是所述终端L1/L2切换的候选小区。
该实施例例如，S-DU将候选小区的L1测量结果发给CU，CU根据测量结果进行候选小区的修改/释放，或发起L3切换。
该实施例又例如，S-DU将候选小区的L1测量结果或候选小区的CSI测量结果发给T-DU，T-DU根据L1测量结果或CSI测量结果进行后续的调度以及L1/L2切换判决。
该实施例中，对于inter-DU的L1/L2切换，T-DU可以通过S-DU发送的第六接口消息得到终端在目标小区的CSI测量结果，从而在切换完成后及时进行调度。
可选地，作为一个实施例，所述第六接口消息发送时机为如下之一：1)周期性发送；2)所述S-DU发起L1/L2切换或下发L1/L2切换命令时发送；3)所述S-DU收到L1/L2切换命令的混合自动重传请求(Hybrid Automatic Repeat Request，HARQ)反馈时发送；4)所述S-DU收到所述终端上报的L1测量结果时发送；5)所述S-DU收到所述终端上报的CSI测量结果时发送。
可选地，作为一个实施例，所述第六接口消息发送时机为所述S-DU发起L1/L2切换时发送或所述S-DU收到L1/L2切换命令的HARQ反馈时发送；其中，所述候选小区的CSI测量结果为目标小区的CSI测量结果，所述目标小区是所述终端L1/L2切换后的服务小区。
该实施例中，候选小区的CSI测量结果可以仅包括目标小区的CSI测量结果，而不包括其他候选小区的CSI测量结果。
以上结合图2详细描述了根据本申请实施例的切换方法。下面将结合图3详细描述根据本申请另一实施例的切换方法。可以理解的是，从T-DU的描述与图2所示的方法中的S-DU的描述相同或相对应，为避免重复，适当省略相关描述。
图3是本申请实施例的切换方法实现流程示意图，可以应用在T-DU。如图3所示，该方法300包括如下步骤。
S302：T-DU执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述S-DU发送至终端，所述候选小区TA值用于所述终端切换时的上行同步。
所述S-DU是所述终端L1/L2切换前的服务网络侧设备，所述T-DU是所述终端L1/L2切换后的服务网络侧设备。
该实施例例如，S-DU向CU发送接口消息，如终端上下文修改要求(UE Context Modification Require)消息；CU收到接口消息后向T-DU转发第一接口消息，如终端上下文修改请求(UE Context Modification Request)消息，上述接口消息与待切换的终端相关联。
需要说明的是，实施例300中与实施例200中均使用了第一接口消息，可以理解，在不同的实施例中，第一接口消息的类型可以不同，例如，在实施例200中的第一接口消息可以是UE Context Modification Require消息，实施例300中的第一接口消息可以是UE Context Modification Request消息。同理，在不同的实施例中，第二接口消息、第三接口消息等的类型可以不同。
该实施例又例如，T-DU向CU发送第二接口消息，如UE Context Modification Require消息，消息携带候选小区TA值等；CU向S-DU发送接口消息，如UE Context Modification Request消息，该消息携带候选小区TA值。该实施例中，T-DU将终端在候选小区的TA值发给S-DU，S-DU发送给终端以获取在目标小区的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
该实施例中，T-DU对终端进行调度以确认切换完成或切换失败的实现细节可以参见实施例200的描述。
本申请实施例提供的切换方法，T-DU执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述第一接口消息包括如下至少之一：1)用于指示L1/L2切换发起的指示信息；2)目标小区的标识信息；3)与目标小区关联的TCI状态；4)所述T-DU调度所述终端的最大次数；5)第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端；其中，所述目标小区是所述终端L1/L2切换后的服务小区。
可选地，作为一个实施例，所述T-DU对终端进行调度包括如下至少之一：1)向所述终端发送上行授权；2)触发所述终端进行非周期CSI上报。
该实施例中，在S302之后，T-DU可以执行如下至少之一：1)向所述终端发送上行授权；2)触发所述终端进行非周期CSI上报。
可选地，作为一个实施例，所述方法还包括：若所述T-DU成功解码所述终端发送的上行信道携带的数据，则确认切换完成。
可选地，作为一个实施例，所述方法还包括：若所述T-DU未成功解码所述终端发送的上行信道携带的数据，则所述T-DU再次调度所述终端，直到调度次数超过调度所述终端的最大次数，或调度时间超过第一定时器时长。
可选地，作为一个实施例，所述方法还包括：若T-DU对所述终端的调度次数达到或超过调度所述终端的最大次数，或调度时间超过所述第一定时器时长，则停止对所述终端的调度，所述T-DU确认切换失败。
可选地，作为一个实施例，所述T-DU接收第一接口消息之后，所述方法还包括：所述T-DU发送第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)和被应用的无线资源控制RRC重配置消息关联的索引或标识；5)用于指示L1/L2切换完成或切换失败的指示信息。
该实施例中，T-DU在确认切换成功或切换失败之后，可以向CU发送第三接口消息，如UE Context Modification Require消息，向CU指示L1/L2切换成功或切换失败；这样，CU可以向S-DU发送接口消息，如UE Context Modification Request消息。
可选地，作为一个实施例，所述第二接口消息还包括如下至少之一：1)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；2)候选小区的标识信息，所述候选小区是所述终端L1/L2切换的候选小区；3)所述终端的标识信息。
可选地，作为一个实施例，所述T-DU发送第二接口消息之前，所述方法还包括：所述T-DU根据所述终端发送的Preamble或SRS获取所述候选小区TA值。
可选地，作为一个实施例，所述T-DU根据所述终端发送的Preamble或SRS获取所述候选小区TA值之前，所述方法还包括：所述T-DU发送第四接口消息，所述第四接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)候选小区为所述终端分配的RACH资源或SRS资源。
该实施例中，T-DU向CU发送第四接口消息，第四接口消息中包含候选小区为终端分配的RACH资源或SRS资源等；CU向S-DU发送接口消息，包含候选小区为终端分配的RACH资源或SRS资源等。
可选地，作为一个实施例，所述T-DU发送第四接口消息之前，所述方法还包括：所述T-DU接收第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)用于请求RACH资源或SRS资源的指示信息。
该实施例中，S-DU向CU发送接口消息，接口消息中包含用于请求RACH资源或SRS资源的指示信息等；CU向T-DU发送第五接口消息，包含用于请求RACH资源或SRS资源的指示信息等。
可选地，作为一个实施例，所述RACH资源包括如下至少之一：频点，时频域位置，发送周期，偏移，使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息，PRACH掩码索引，Preamble索引；所述SRS资源包括如下至少之一：频点，时频域位置，发送周期，偏移，所述终端使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息。
可选地，作为一个实施例，所述方法还包括：所述T-DU接收第六接口消息，所述第六接口消息包括如下至少之一：1)候选小区的标识信息；2)候选小区的L1测量结果；3)候选小区的CSI测量结果；4)所述终端的标识信息；其中，所述候选小区是所述终端L1/L2切换的候选小区。
该实施例中，S-DU将候选小区的L1测量结果或候选小区的CSI测量结果发给T-DU，T-DU根据L1测量结果或CSI测量结果进行后续的调度以及L1/L2切换判决。
该实施例中，对于inter-DU的L1/L2切换，T-DU可以通过第六接口消息得到终端在目标小区的CSI测量结果，从而在切换完成后及时进行调度。
图4是本申请实施例的切换方法实现流程示意图，可以应用在CU。如图4所示，该方法400包括如下步骤。
S402：CU执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息，接收S-DU发送的第一接口消息，接收T-DU发送的第三接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
所述S-DU是所述终端L1/L2切换前的服务网络侧设备，所述T-DU是所述终端L1/L2切换后的服务网络侧设备。
本申请实施例提供的切换方法，CU执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述第一接口消息包括如下至少之一：1)用于指示L1/L2切换发起的指示信息；2)目标小区的标识信息；3)与目标小区关联的传输配置指示TCI状态；4)所述T-DU调度所述终端的最大次数；5)第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端；其中，所述目标小区是所述终端L1/L2切换后的服务小区。
可选地，作为一个实施例，所述CU向T-DU发送所述第一接口消息之后，所述方法还包括：所述CU向所述S-DU发送第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)和被应用的无线资源控制RRC重配置消息关联的索引或标识；5)用于指示L1/L2切换完成或切换失败的指示信息。
可选地，作为一个实施例，所述第二接口消息还包括如下至少之一：1)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；2)候选小区的标识信息，所述候选小区是所述终端L1/L2切换的候选小区；3)所述终端的标识信息。
可选地，作为一个实施例，所述CU向S-DU发送所述第二接口消息之前，所述方法还包括：所述CU向所述S-DU发送第四接口消息，所述第四接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)候选小区为所述 终端分配的RACH资源或SRS资源。
可选地，作为一个实施例，所述方法还包括：所述CU向所述T-DU发送第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)用于请求RACH资源或SRS资源的指示信息。
可选地，作为一个实施例，所述方法还包括：所述CU接收来自于所述S-DU的第六接口消息，所述第六接口消息包括如下至少之一：1)候选小区的标识信息；2)候选小区的L1测量结果；3)候选小区的信道状态信息CSI测量结果；4)所述终端的标识信息；5)其中，所述候选小区是所述终端L1/L2切换的候选小区。
可选地，作为一个实施例，所述方法还包括：所述CU接收来自于所述S-DU的第一接口消息或下行数据递交状态指示后，开始向T-DU发送下行用户数据，目的是在切换尚未完成之前提早进行数据路径切换，以降低数据面时延。
可选地，作为一个实施例，所述方法还包括：所述CU接收来自于所述T-DU的第三接口消息并确定L1/L2切换完成后，开始向T-DU发送下行用户数据，目的是确保L1/L2切换完成后，T-DU可以及时收到CU发送的下行用户数据，以便在新的服务小区调度UE。
图5是本申请实施例的切换方法实现流程示意图，可以应用在终端。如图5所示，该方法500包括如下步骤。
S502：终端监听T-DU的物理下行控制信道(Physical Downlink Control Channel，PDCCH)得到所述T-DU发送的调度请求。
S504：若所述终端基于所述调度请求成功接收包含目标小区分配的小区无线网络临时标识(Cell-Radio Network Temporary Identity，C-RNTI)的PDCCH，则所述终端向所述T-DU发送上行数据。
本申请实施例提供的切换方法，终端监听T-DU的PDCCH得到所述T-DU发送的调度请求；若所述终端基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则所述终端向所述T-DU发送上行数据，本申请实施例有利于T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述上行数据包括如下至少之一：1)HARQ确认应答(Acknowledgement，ACK)或否定应答(Negative Acknowledgement，NACK)；2)CSI报告；3)无线资源控制(Radio Resource Control，RRC) 重配置完成消息；4)与所述终端应用的RRC重配消息关联的索引或标识。
可选地，作为一个实施例，所述方法还包括：若所述终端基于所述调度请求在第二定时器时长内没有成功接收包含目标小区分配的C-RNTI的PDCCH，则所述终端确认切换失败。
为详细说明本申请实施例提供的切换方法，以下将结合几个具体的实施例进行说明。
实施例一
该实施例中，S-DU通知T-DU切换发起，该实施例包括如下步骤：
步骤(Step)1：S-DU发起L1/L2切换或向UE下发L1/L2切换命令。
Step 2：Inter-DU的L1/L2切换可选。S-DU向CU发送接口消息，如UE Context Modification Require消息。CU收到上述接口消息后，向T-DU发送接口消息，如UE Context Modification Request消息。上述接口消息与待切换的UE相关联。
上述接口消息包括以下信元(Information Element，IE)至少之一：
1)切换发起指示，或称作是用于指示L1/L2切换发起的指示信息。
2)目标小区的标识信息，该标识信息例如包括：目标小区标识(Identity，ID)，小区全局标识(Cell Global Identity，CGI)，物理小区标识(Physical Cell Identifier，PCI)等。
3)与目标小区PCI关联的TCI状态。
4)T-DU调度终端的次数，或称作是调度终端的最大次数。
5)第一定时器的时长，T-DU可以在第一定时器的时长内多次调度终端。
其中，Step 1和Step 2的发生先后顺序不做强制限定，即Step 1和Step 2的顺序可以调整，或同时发起。
Step 3：T-DU对UE进行调度，调度可以是以下行为至少之一：
1)发送UL Grant。
2)触发非周期CSI上报。
该实施例中，若配置了第一定时器，则T-DU在对UE发起调度后启动第一定时器。
该实施例中，对于Inter-DU切换，T-DU可以在接收到Step 2中来自于CU的接口消息后执行Step 3。
Step 4：T-DU成功解码UE发送的PUCCH或PUSCH信道携带的数据，确认切换完成；可选地，T-DU向CU发送接口消息，如UE Context Modification Response，向CU指示L1/L2切换完成。
该实施例中，对于inter-DU切换，在CU收到接口消息后，可选地，CU向S-DU发送接口消息，如UE Context Modification Confirm，向S-DU指示 L1/L2切换完成。
所述接口消息可以包含以下至少之一：
1)UE ID。
2)源小区的ID，CGI或PCI。
3)目标小区的ID，CGI或PCI。
4)和被应用的RRC重配消息关联的索引或标识。
5)L1/L2切换成功指示。
Step 5：若T-DU未成功解码UE发送的PUCCH或PUSCH信道携带的数据，则T-DU再次调度UE，直到调度次数超过最大调度次数，或调度时间超过第一定时器时长。
可以理解，在调度次数未超过最大调度次数，或调度时间未超过第一定时器时长的情况下，若T-DU成功解码UE发送的PUCCH或PUSCH信道携带的数据，T-DU也可以停止对UE的调度。
Step 6：若T-DU对UE的调度次数超过最大调度次数，或调度时间超过第一定时器时长，则停止对UE的调度，T-DU确认切换失败。
可选地，T-DU向CU发送接口消息，如UE Context Modification Require，向CU指示L1/L2切换失败；对于inter-DU切换，可选地，CU向S-DU发送接口消息，如UE Context Modification Confirm，向S-DU指示L1/L2切换失败。
所述接口消息可以包含以下至少之一：
1)UE ID。
2)源小区的ID，CGI或PCI。
3)目标小区的ID，CGI或PCI。
4)和被应用的RRC重配消息关联的索引或标识。
5)L1/L2切换失败指示。
实施例一以上内容介绍的是网络侧执行的步骤，对于终端侧，该实施例包括如下步骤：
Step 1：UE接收S-DU下发的L1/L2切换命令，使用保存的目标小区的同步重配置或目标辅小区组(Secondary Cell Group，SCG)的同步重配置。
Step 2：UE监听T-DU的PDCCH，解码DCI得到T-DU发送的调度请求，UE确认切换完成。所述调度请求包含以下至少之一：
1)UL Grant。
2)非周期CSI上报。
Step 3：UE成功接收包含目标小区分配的C-RNTI的PDCCH，则UE向T-DU发送上行数据，所述上行数据通过PUCCH或PUSCH承载，所述上行 数据可以是以下至少之一：
1)HARQ ACK/NACK反馈。
2)CSI报告。
3)RRC重配完成消息。
4)和被Step 1应用的RRC重配消息关联的索引或标识。
该实施例中，若UE在第二定时器时长内没有成功接收包含目标小区分配的C-RNTI的PDCCH，UE确认切换失败。
所述第二定时器时长有以下配置方式：
1)在切换发起之前，由CU的RRC预配置。
2)由S-DU下发的L1/L2切换命令携带。
所述第二定时器可以在UE接收到S-DU下发的L1/L2切换命令后启动。
实施例二
该实施例中，S-DU将候选小区的L1测量结果发给CU，CU根据测量结果进行候选小区的修改或释放，或发起L3切换。该实施例包括如下步骤：
Step 1：S-DU接收到UE上报的L1测量结果。
Step 2：S-DU向CU发送接口消息，如UE Context Modification Require消息，消息包含以下IE至少之一：
1)各个候选小区的ID。
2)各个候选小区的L1测量结果。
3)UE ID。
所述第七接口消息发送时机可以是如下之一：
1)周期性发送，周期可以由CU配置。
2)S-DU发起L1/L2切换/下发L1/L2切换命令时发送。
3)S-DU收到L1/L2切换命令的HARQ反馈时发送。
4)S-DU收到UE上报的L1测量结果时发送。
Step 3：CU根据S-DU上报的L1测量结果，执行候选小区的配置修改、删除，或发起L3切换。
实施例三
该实施例中，S-DU将候选小区的L1测量结果和/或候选小区的CSI测量结果发给T-DU，T-DU从而在切换完成后及时进行调度。该实施例包括如下步骤：
Step 1：S-DU接收到UE上报的候选小区的L1测量结果和/或CSI测量结果。
Step 2：Inter-DU切换可选，S-DU向CU发送接口消息，所述接口消息包含以下IE至少之一：
1)候选小区的ID，CGI或PCI。
2)候选小区的L1测量结果，例如信干噪比(Signal to Interference plus Noise Ratio，SINR)，信噪比(Signal Noise Ratio，SNR)，参考信号接收功率(Reference Signal Receiving Power，RSRP)，参考信号接收质量(Reference Signal Receiving Quality，RSRQ)等。
3)候选小区的CSI测量结果，例如秩指示(Rank Indication，RI)，信道质量指示(Channel Quality Indicator，CQI)，信道状态信息参考信号资源指示符(CSI-RS Resource Indicator，CRI)，层指示(Layer Indicator，LI)，预编码矩阵指示(Pre-coding Matrix Indicator，PMI)等。
4)UE ID。
可选地，所述接口消息的发送时机可以是：
1)周期性发送，周期可以由CU配置。
2)S-DU发起L1/L2切换/下发L1/L2切换命令时发送。
3)S-DU收到L1/L2切换命令的HARQ反馈时发送。
4)S-DU收到UE上报的L1测量结果和/或CSI测量结果时发送。
可选地，若S-DU在发起L1/L2切换或收到L1/L2切换的HARQ反馈时发送上述接口消息，则可以只发送目标小区的CSI测量结果，而不包括其他候选小区的CSI测量结果。
Step 3：Inter-DU切换可选，CU收到接口消息后，向T-DU发送接口消息，所述接口消息包含以下IE至少之一：
1)候选小区的ID，CGI或PCI。
2)候选小区的L1测量结果。
3)候选小区的CSI测量结果。
4)UE ID。
Step 4：UE切换完成后，T-DU根据CSI测量结果决策调度，T-DU根据候选小区的L1测量结果执行L1/L2切换判决。
实施例四
该实施例中，T-DU将UE在候选小区的TA发给S-DU，从而节省UE在切换执行时上行同步的时延。该实施例包括如下步骤：
Step 0：Inter-DU切换可选，T-DU向CU发送接口消息，接口消息中包含候选小区为UE分配的RACH资源或SRS资源；CU向S-DU发送接口消息，消息中包含候选小区为UE分配的RACH资源或SRS资源。
所述第十接口消息/第十一接口消息包含以下IE至少之一：
1)UE ID。
2)源小区的ID，CGI或PCI。
3)候选小区的ID，CGI或PCI。
4)候选小区为UE分配的RACH资源或SRS资源。
可选的，对于Inter-DU切换，在Step 0之前，S-DU向CU发送接口消息，接口消息中包含请求候选小区为UE分配RACH资源或SRS资源；CU向T-DU发送接口消息，接口消息中包含请求候选小区为UE分配RACH资源或SRS资源。
所述接口消息包含以下IE至少之一：
1)UE ID。
2)源小区的ID，CGI或PCI。
3)候选小区的ID，CGI或PCI。
4)用于请求RACH资源或SRS资源的指示信息。
Step 1：S-DU向UE发送候选小区为UE分配的RACH资源或SRS资源。
所述候选小区分配的RACH资源或SRS资源包含以下至少之一：
1)RACH资源或SRS资源的频点，时频域位置，发送周期，偏移，使用的上行载波等。
2)和RACH资源或SRS资源关联的候选小区的RS index，如ssb-Index或csi-RS-Index。
3)和RACH资源或SRS资源关联的候选小区ID/PCI。
4)PRACH Mask index。
5)一个或多个Preamble index。
Step 1：T-DU根据UE发送的Preamble或SRS获取UE在候选小区的TA值。
Step 2：Inter-DU切换可选，T-DU向CU发送接口消息，如UE Context Modification Require消息，接口消息携带以下IE至少之一：
1)源小区的ID，CGI或PCI。
2)候选小区的ID，CGI或PCI。
3)候选小区TA值。
4)UE ID。
Step 3：Inter-DU切换可选，CU向S-DU发送接口消息，如UE Context Modification Request消息，消息携带以下IE至少之一：
1)源小区的ID，CGI或PCI。
2)候选小区的ID，CGI或PCI。
3)候选小区TA值。
4)UE ID。
Step 4：S-DU将候选小区TA值发送给UE，或触发L1/L2切换时，在 L1/L2切换命令中携带目标小区的TA值，所述L1/L2切换命令可以是DCI或MAC CE，所述TA值可以是UE在候选小区的绝对TA值，也可以是相对于服务小区TA值的相对TA值。
图6是根据本申请实施例的终端的结构示意图，如图6所示，终端600包括如下模块。
通信模块602，用于监听T-DU的PDCCH得到所述T-DU发送的调度请求。
所述通信模块602，还用于若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据。
可选地，终端600还包括处理模块。
本申请实施例中，通信模块监听T-DU的PDCCH得到所述T-DU发送的调度请求；若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据，本申请实施例有利于T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述上行数据包括如下至少之一：1)混合自动重传请求确认应答HARQ ACK或否定应答NACK；2)CSI报告；3)RRC重配置完成消息；4)与所述终端应用的RRC重配消息关联的索引或标识。
可选地，作为一个实施例，所述通信模块602，还用于若基于所述调度请求在第二定时器时长内没有成功接收包含目标小区分配的C-RNTI的PDCCH，则确认切换失败。
根据本申请实施例的终端600可以参照对应本申请实施例的方法500的流程，并且，该终端600中的各个单元/模块和上述其他操作和/或功能分别为了实现方法500中的相应流程，并且能够达到相同或等同的技术效果，为了简洁，在此不再赘述。
本申请实施例中的终端可以是电子设备，例如具有操作系统的电子设备，也可以是电子设备中的部件，例如集成电路或芯片。示例性的，终端可以包括但不限于上述所列举的终端11的类型，其他设备可以为服务器、网络附属存储器(Network Attached Storage，NAS)等，本申请实施例不作具体限定。
图7是根据本申请实施例的第一网络侧设备的结构示意图，该第一网络侧设备可以对应于其他实施例中的S-DU。如图7所示，第一网络侧设备700包括如下模块。
通信模块702，用于发起L1/L2切换。
所述通信模块702，还用于执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终 端进行调度；所述第二接口消息包括候选小区定时提前TA值，所述候选小区TA值用于终端切换时的上行同步。
可选地，第一网络侧设备700还包括处理模块。
本申请实施例中，第一网络侧设备发起L1/L2切换及执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述第一接口消息包括如下至少之一：1)用于指示L1/L2切换发起的指示信息；2)目标小区的标识信息；3)与目标小区关联的传输配置指示TCI状态；4)所述T-DU调度所述终端的最大次数；5)第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端；其中，所述目标小区是所述终端L1/L2切换后的服务小区。
可选地，作为一个实施例，所述通信模块702，还用于接收第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)和被应用的无线资源控制RRC重配置消息关联的索引或标识；5)用于指示L1/L2切换完成或切换失败的指示信息。
可选地，作为一个实施例，所述第二接口消息还包括如下至少之一：1)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；2)候选小区的标识信息，所述候选小区是所述终端L1/L2切换的候选小区；3)所述终端的标识信息。
可选地，作为一个实施例，所述通信模块702，还用于向所述终端发送RACH资源或资源，所述RACH资源或SRS资源是候选小区为所述终端分配的；其中，所述RACH资源或SRS资源用于获取所述候选小区TA值。
可选地，作为一个实施例，所述通信模块702，还用于接收第四接口消息，所述第四接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)候选小区为所述终端分配的RACH资源或SRS资源。
可选地，作为一个实施例，所述通信模块702，还用于发送第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口 消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)用于请求RACH资源或SRS资源的指示信息。
可选地，作为一个实施例，所述RACH资源包括如下至少之一：频点，时频域位置，发送周期，偏移，使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息，PRACH掩码索引，Preamble索引；所述SRS资源包括如下至少之一：频点，时频域位置，发送周期，偏移，所述终端使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息。
可选地，作为一个实施例，所述通信模块702，还用于将所述候选小区TA值发送给所述终端；或者，在L1/L2切换命令中携带目标小区的TA值，所述目标小区是所述终端L1/L2切换后的服务小区。
可选地，作为一个实施例，所述通信模块702，还用于向所述T-DU和/或CU发送第六接口消息，所述第六接口消息包括如下至少之一：1)候选小区的标识信息；2)候选小区的L1测量结果；3)候选小区的CSI测量结果；4)所述终端的标识信息；其中，所述候选小区是所述终端L1/L2切换的候选小区。
可选地，作为一个实施例，所述第六接口消息发送时机为如下之一：1)周期性发送；2)发起L1/L2切换或下发L1/L2切换命令时发送；3)收到L1/L2切换命令的HARQ反馈时发送；4)收到所述终端上报的L1测量结果时发送；5)收到所述终端上报的CSI测量结果时发送。
可选地，作为一个实施例，所述第六接口消息发送时机为发起L1/L2切换时发送或收到L1/L2切换命令的HARQ反馈时发送；其中，所述候选小区的CSI测量结果为目标小区的CSI测量结果，所述目标小区是所述终端L1/L2切换后的服务小区。
根据本申请实施例的第一网络侧设备700可以参照对应本申请实施例的方法200的流程，并且，该第一网络侧设备700中的各个单元/模块和上述其他操作和/或功能分别为了实现方法200中的相应流程，并且能够达到相同或等同的技术效果，为了简洁，在此不再赘述。
图8是根据本申请实施例的第二网络侧设备的结构示意图，该第二网络侧设备可以对应于其他实施例中的T-DU。如图8所示，第二网络侧设备800包括如下模块。
通信模块802，用于执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示所述第二网络侧设备对 终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述S-DU发送至终端，所述候选小区TA值用于所述终端切换时的上行同步。
可选地，第二网络侧设备800还包括处理模块。
本申请实施例中，第二网络侧设备执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示第二网络侧设备对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述第一接口消息包括如下至少之一：1)用于指示L1/L2切换发起的指示信息；2)目标小区的标识信息；3)与目标小区关联的TCI状态；4)所述T-DU调度所述终端的最大次数；5)第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端；其中，所述目标小区是所述终端L1/L2切换后的服务小区。
可选地，作为一个实施例，所述第二网络侧设备对终端进行调度包括如下至少之一：1)向所述终端发送上行授权；2)触发所述终端进行非周期CSI上报。
可选地，作为一个实施例，所述方法还包括：若所述T-DU成功解码所述终端发送的上行信道携带的数据，则确认切换完成。
可选地，作为一个实施例，所述通信模块802，还用于：若未成功解码所述终端发送的上行信道携带的数据，则再次调度所述终端，直到调度次数超过调度所述终端的最大次数，或调度时间超过第一定时器时长。
可选地，作为一个实施例，所述通信模块802，还用于若对所述终端的调度次数达到或超过调度所述终端的最大次数，或调度时间超过所述第一定时器时长，则停止对所述终端的调度，确认切换失败。
可选地，作为一个实施例，所述通信模块802，还用于发送第三接口消息，所述第三接口消息是所述第二网络侧设备在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)和被应用的RRC重配置消息关联的索引或标识；5)用于指示L1/L2切换完成或切换失败的指示信息。
可选地，作为一个实施例，所述第二接口消息还包括如下至少之一：1)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；2)候 选小区的标识信息，所述候选小区是所述终端L1/L2切换的候选小区；3)所述终端的标识信息。
可选地，作为一个实施例，所述通信模块802，还用于根据所述终端发送的Preamble或SRS获取所述候选小区TA值。
可选地，作为一个实施例，所述通信模块802，还用于发送第四接口消息，所述第四接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)候选小区为所述终端分配的RACH资源或SRS资源。
可选地，作为一个实施例，所述通信模块802，还用于接收第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)用于请求RACH资源或SRS资源的指示信息。
可选地，作为一个实施例，所述RACH资源包括如下至少之一：频点，时频域位置，发送周期，偏移，使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息，PRACH掩码索引，Preamble索引；所述SRS资源包括如下至少之一：频点，时频域位置，发送周期，偏移，所述终端使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息。
可选地，作为一个实施例，所述通信模块802，还用于接收第六接口消息，所述第六接口消息包括如下至少之一：1)候选小区的标识信息；2)候选小区的L1测量结果；3)候选小区的CSI测量结果；4)所述终端的标识信息；其中，所述候选小区是所述终端L1/L2切换的候选小区。
根据本申请实施例的第二网络侧设备800可以参照对应本申请实施例的方法300的流程，并且，该第二网络侧设备800中的各个单元/模块和上述其他操作和/或功能分别为了实现方法300中的相应流程，并且能够达到相同或等同的技术效果，为了简洁，在此不再赘述。
图9是根据本申请实施例的第三网络侧设备的结构示意图，该第三网络侧设备可以对应于其他实施例中的CU。如图9所示，第三网络侧设备900包括如下模块。
通信模块902，用于执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息，接收S-DU发送的第一接口消息，接收T-DU发送的第三接口消息；其中，所述第一接口消息用于指示所述T-DU对终端进行 调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
可选地，第三网络侧设备900还包括处理模块。
本申请实施例中，第三网络侧设备执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息；其中，所述第一接口消息用于指示T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步，从而节省终端在切换执行时上行同步的时延，避免终端L1/L2切换失败，提升通信系统性能。
可选地，作为一个实施例，所述第一接口消息包括如下至少之一：1)用于指示L1/L2切换发起的指示信息；2)目标小区的标识信息；3)与目标小区关联的传输配置指示TCI状态；4)所述T-DU调度所述终端的最大次数；5)第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端；其中，所述目标小区是所述终端L1/L2切换后的服务小区。
可选地，作为一个实施例，所述通信模块902，还用于向所述S-DU发送第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)和被应用的RRC重配置消息关联的索引或标识；5)用于指示L1/L2切换完成或切换失败的指示信息。
可选地，作为一个实施例，所述第二接口消息还包括如下至少之一：1)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；2)候选小区的标识信息，所述候选小区是所述终端L1/L2切换的候选小区；3)所述终端的标识信息。
可选地，作为一个实施例，所述通信模块902，还用于向所述S-DU发送第四接口消息，所述第四接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)候选小区为所述终端分配的RACH资源或SRS资源。
可选地，作为一个实施例，所述通信模块902，还用于向所述T-DU发送第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：1)所述终端的标识信息；2)源小区的标识信息，所述源小区是所述终端L1/L2切换前的服务小区；3)目标小区的标识信息，所述目标小区是所述终端L1/L2切换后的服务小区；4)用于请求 RACH资源或SRS资源的指示信息。
可选地，作为一个实施例，所述通信模块902，还用于接收来自于所述S-DU的第六接口消息，所述第六接口消息包括如下至少之一：1)候选小区的标识信息；2)候选小区的L1测量结果；3)候选小区的信道状态信息CSI测量结果；4)所述终端的标识信息；5)其中，所述候选小区是所述终端L1/L2切换的候选小区。
根据本申请实施例的第三网络侧设备900可以参照对应本申请实施例的方法400的流程，并且，该第三网络侧设备900中的各个单元/模块和上述其他操作和/或功能分别为了实现方法400中的相应流程，并且能够达到相同或等同的技术效果，为了简洁，在此不再赘述。
可选的，如图10所示，本申请实施例还提供一种通信设备1000，包括处理器1001和存储器1002，存储器1002上存储有可在所述处理器1001上运行的程序或指令，例如，该通信设备1000为终端时，该程序或指令被处理器1001执行时实现上述切换方法实施例的各个步骤，且能达到相同的技术效果。该通信设备1000为网络侧设备时，该程序或指令被处理器1001执行时实现上述切换方法实施例的各个步骤，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还提供一种终端，包括处理器和通信接口，通信接口用于监听T-DU的PDCCH得到所述T-DU发送的调度请求；若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据。该终端实施例与上述终端侧方法实施例对应，上述方法实施例的各个实施过程和实现方式均可适用于该终端实施例中，且能达到相同的技术效果。具体地，图11为实现本申请实施例的一种终端的硬件结构示意图。
该终端1100包括但不限于：射频单元1101、网络模块1102、音频输出单元1103、输入单元1104、传感器1105、显示单元1106、用户输入单元1107、接口单元1108、存储器1109以及处理器1110等中的至少部分部件。
本领域技术人员可以理解，终端1100还可以包括给各个部件供电的电源(比如电池)，电源可以通过电源管理系统与处理器1110逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。图11中示出的终端结构并不构成对终端的限定，终端可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置，在此不再赘述。
应理解的是，本申请实施例中，输入单元1104可以包括图形处理器(Graphics Processing Unit，GPU)11041和麦克风11042，图形处理器11041对在视频捕获模式或图像捕获模式中由图像捕获装置(如摄像头)获得的静态图片或视频的图像数据进行处理。显示单元1106可包括显示面板11061， 可以采用液晶显示器、有机发光二极管等形式来配置显示面板11061。用户输入单元1107包括触控面板11071以及其他输入设备11072中的至少一种。触控面板11071，也称为触摸屏。触控面板11071可包括触摸检测装置和触摸控制器两个部分。其他输入设备11072可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆，在此不再赘述。
本申请实施例中，射频单元1101接收来自网络侧设备的下行数据后，可以传输给处理器1110进行处理；另外，射频单元1101可以向网络侧设备发送上行数据。通常，射频单元1101包括但不限于天线、放大器、收发信机、耦合器、低噪声放大器、双工器等。
存储器1109可用于存储软件程序或指令以及各种数据。存储器1109可主要包括存储程序或指令的第一存储区和存储数据的第二存储区，其中，第一存储区可存储操作系统、至少一个功能所需的应用程序或指令(比如声音播放功能、图像播放功能等)等。此外，存储器1109可以包括易失性存储器或非易失性存储器，或者，存储器1109可以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)，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，DDRSDRAM)、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)和直接内存总线随机存取存储器(Direct Rambus RAM，DRRAM)。本申请实施例中的存储器1109包括但不限于这些和任意其它适合类型的存储器。
处理器1110可包括一个或多个处理单元；可选的，处理器1110集成应用处理器和调制解调处理器，其中，应用处理器主要处理涉及操作系统、用户界面和应用程序等的操作，调制解调处理器主要处理无线通信信号，如基带处理器。可以理解的是，上述调制解调处理器也可以不集成到处理器1110中。
其中，射频单元1101，可以用于监听T-DU的PDCCH得到所述T-DU发送的调度请求；若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据。
本申请实施例中，终端监听T-DU的PDCCH得到所述T-DU发送的调度请求；若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据，本申请实施例有利于T-DU对终端进行调度以确认切换完成或切换失败，可以避免终端L1/L2切换失败，提升通信系统性能。
本申请实施例提供的终端1100还可以实现上述切换方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还提供一种网络侧设备，包括处理器和通信接口，通信接口用于执行图2至图4任一项所述的方法的步骤。该网络侧设备实施例与上述网络侧设备方法实施例对应，上述方法实施例的各个实施过程和实现方式均可适用于该网络侧设备实施例中，且能达到相同的技术效果。
具体地，本申请实施例还提供了一种网络侧设备。如图12所示，该网络侧设备1200包括：天线121、射频装置122、基带装置123、处理器124和存储器125。天线121与射频装置122连接。在上行方向上，射频装置122通过天线121接收信息，将接收的信息发送给基带装置123进行处理。在下行方向上，基带装置123对要发送的信息进行处理，并发送给射频装置122，射频装置122对收到的信息进行处理后经过天线121发送出去。
以上实施例中网络侧设备执行的方法可以在基带装置123中实现，该基带装置123包括基带处理器。
基带装置123例如可以包括至少一个基带板，该基带板上设置有多个芯片，如图12所示，其中一个芯片例如为基带处理器，通过总线接口与存储器125连接，以调用存储器125中的程序，执行以上方法实施例中所示的网络设备操作。
该网络侧设备还可以包括网络接口126，该接口例如为通用公共无线接口(common public radio interface，CPRI)。
具体地，本申请实施例的网络侧设备1200还包括：存储在存储器125上并可在处理器124上运行的指令或程序，处理器124调用存储器125中的指令或程序执行图7至图9任一项所示各模块执行的方法，并达到相同的技术效果，为避免重复，故不在此赘述。
本申请实施例还提供一种可读存储介质，所述可读存储介质上存储有程序或指令，该程序或指令被处理器执行时实现上述切换方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
其中，所述处理器为上述实施例中所述的终端中的处理器。所述可读存储介质，包括计算机可读存储介质，如计算机只读存储器ROM、随机存取存储器RAM、磁碟或者光盘等。
本申请实施例另提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现上述切换方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
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。
本申请实施例另提供了一种计算机程序/程序产品，所述计算机程序/程序产品被存储在存储介质中，所述计算机程序/程序产品被至少一个处理器执行以实现上述切换方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还提供了一种L1/L2切换系统，包括：终端及网络侧设备，所述终端可用于执行如上所述的切换方法的步骤，所述网络侧设备可用于执行如上所述的切换方法的步骤。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外，需要指出的是，本申请实施方式中的方法和装置的范围不限按示出或讨论的顺序来执行功能，还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能，例如，可以按不同于所描述的次序来执行所描述的方法，并且还可以添加、省去、或组合各种步骤。另外，参照某些示例所描述的特征可在其他示例中被组合。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。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可以以计算机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(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (45)

  1. 一种切换方法，包括：
    源分布式单元S-DU发起层一L1/层二L2切换；
    所述S-DU执行如下至少之一：向目标分布式单元T-DU发送第一接口消息，接收第二接口消息；
    其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区定时提前TA值，所述候选小区TA值用于终端切换时的上行同步。
  2. 根据权利要求1所述的方法，其中，所述第一接口消息包括如下至少之一：
    用于指示L1/L2切换发起的指示信息；
    目标小区的标识信息；
    与目标小区关联的传输配置指示TCI状态；
    所述T-DU调度所述终端的最大次数；
    第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端。
  3. 根据权利要求1所述的方法，其中，所述S-DU发送第一接口消息之后，所述方法还包括：所述S-DU接收第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    和被应用的无线资源控制RRC重配置消息关联的索引或标识；
    用于指示L1/L2切换完成或切换失败的指示信息。
  4. 根据权利要求1所述的方法，其中，所述第二接口消息还包括如下至少之一：
    源小区的标识信息；
    候选小区的标识信息；
    所述终端的标识信息。
  5. 根据权利要求1所述的方法，其中，所述S-DU接收第二接口消息之前，所述方法还包括：
    所述S-DU向所述终端发送随机接入信道RACH资源或探测参考信号SRS资源，所述RACH资源或SRS资源是候选小区为所述终端分配的；
    其中，所述RACH资源或SRS资源用于获取所述候选小区TA值。
  6. 根据权利要求5所述的方法，其中，所述S-DU向所述终端发送RACH资源或SRS资源之前，所述方法还包括：
    所述S-DU接收第四接口消息，所述第四接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    候选小区为所述终端分配的RACH资源或SRS资源。
  7. 根据权利要求6所述的方法，其中，所述S-DU接收第四接口消息之前，所述方法还包括：所述S-DU发送第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    用于请求RACH资源或SRS资源的指示信息。
  8. 根据权利要求5至7任一项所述的方法，其中，
    所述RACH资源包括如下至少之一：频点，时频域位置，发送周期，偏移，使用的上行载波，关联的候选小区的参考信号RS索引，关联的候选小区的标识信息，物理随机接入信道PRACH掩码索引，随机接入前导码Preamble索引；
    所述SRS资源包括如下至少之一：频点，时频域位置，发送周期，偏移，所述终端使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息。
  9. 根据权利要求1所述的方法，其中，所述S-DU接收第二接口消息之后，所述方法还包括：
    所述S-DU将所述候选小区TA值发送给所述终端；或者
    所述S-DU在L1/L2切换命令中携带目标小区的TA值。
  10. 根据权利要求1所述的方法，其中，所述方法还包括：所述S-DU向所述T-DU和/或中心单元CU发送第六接口消息，所述第六接口消息包括如下至少之一：
    候选小区的标识信息；
    候选小区的L1测量结果；
    候选小区的信道状态信息CSI测量结果；
    所述终端的标识信息。
  11. 根据权利要求10所述的方法，其中，所述第六接口消息发送时机为如下之一：
    周期性发送；
    所述S-DU发起L1/L2切换或下发L1/L2切换命令时发送；
    所述S-DU收到L1/L2切换命令的混合自动重传请求HARQ反馈时发送；
    所述S-DU收到所述终端上报的L1测量结果时发送；
    所述S-DU收到所述终端上报的CSI测量结果时发送。
  12. 根据权利要求11所述的方法，其中，所述第六接口消息发送时机为所述S-DU发起L1/L2切换时发送或所述S-DU收到L1/L2切换命令的HARQ反馈时发送；
    其中，所述候选小区的CSI测量结果为目标小区的CSI测量结果。
  13. 根据权利要求1所述的方法，其中，源分布式单元S-DU发起层一L1/层二L2切换之后，还包括：
    所述S-DU再向CU发送第一接口消息和下行数据递交状态指示。
  14. 一种切换方法，包括：
    T-DU执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；
    其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述S-DU发送至终端，所述候选小区TA值用于所述终端切换时的上行同步。
  15. 根据权利要求14所述的方法，其中，所述第一接口消息包括如下至少之一：
    用于指示L1/L2切换发起的指示信息；
    目标小区的标识信息；
    与目标小区关联的TCI状态；
    所述T-DU调度所述终端的最大次数；
    第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端。
  16. 根据权利要求14所述的方法，其中，所述T-DU对终端进行调度包括如下至少之一：
    向所述终端发送上行授权；
    触发所述终端进行非周期CSI上报。
  17. 根据权利要求16所述的方法，其中，所述方法还包括：
    若所述T-DU成功解码所述终端发送的上行信道携带的数据，则确认切换完成。
  18. 根据权利要求16所述的方法，其中，所述方法还包括：
    若所述T-DU未成功解码所述终端发送的上行信道携带的数据，则所述 T-DU再次调度所述终端，直到调度次数超过调度所述终端的最大次数，或调度时间超过第一定时器时长。
  19. 根据权利要求18所述的方法，其中，所述方法还包括：
    若T-DU对所述终端的调度次数达到或超过调度所述终端的最大次数，或调度时间超过所述第一定时器时长，则停止对所述终端的调度，所述T-DU确认切换失败。
  20. 根据权利要求17或19所述的方法，其中，所述T-DU接收第一接口消息之后，所述方法还包括：所述T-DU发送第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    和被应用的无线资源控制RRC重配置消息关联的索引或标识；
    用于指示L1/L2切换完成或切换失败的指示信息。
  21. 根据权利要求14所述的方法，其中，所述第二接口消息还包括如下至少之一：
    源小区的标识信息；
    候选小区的标识信息；
    所述终端的标识信息。
  22. 根据权利要求14所述的方法，其中，所述T-DU发送第二接口消息之前，所述方法还包括：
    所述T-DU根据所述终端发送的Preamble或SRS获取所述候选小区TA值。
  23. 根据权利要求22所述的方法，其中，所述T-DU根据所述终端发送的Preamble或SRS获取所述候选小区TA值之前，所述方法还包括：
    所述T-DU发送第四接口消息，所述第四接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    候选小区为所述终端分配的RACH资源或SRS资源。
  24. 根据权利要求23所述的方法，其中，所述T-DU发送第四接口消息之前，所述方法还包括：所述T-DU接收第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    用于请求RACH资源或SRS资源的指示信息。
  25. 根据权利要求23或24所述的方法，其中，
    所述RACH资源包括如下至少之一：频点，时频域位置，发送周期，偏移，使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息，PRACH掩码索引，Preamble索引；
    所述SRS资源包括如下至少之一：频点，时频域位置，发送周期，偏移，所述终端使用的上行载波，关联的候选小区的RS索引，关联的候选小区的标识信息。
  26. 根据权利要求14所述的方法，其中，所述方法还包括：所述T-DU接收第六接口消息，所述第六接口消息包括如下至少之一：
    候选小区的标识信息；
    候选小区的L1测量结果；
    候选小区的CSI测量结果；
    所述终端的标识信息。
  27. 一种切换方法，包括：
    中心单元CU执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息，接收S-DU发送的第一接口消息，接收T-DU发送的第三接口消息；
    其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行同步。
  28. 根据权利要求27所述的方法，其中，所述第一接口消息包括如下至少之一：
    用于指示L1/L2切换发起的指示信息；
    目标小区的标识信息；
    与目标小区关联的传输配置指示TCI状态；
    所述T-DU调度所述终端的最大次数；
    第一定时器的时长，所述T-DU在所述第一定时器运行期间调度所述终端。
  29. 根据权利要求27所述的方法，其中，所述CU向T-DU发送所述第一接口消息之后，所述方法还包括：所述CU向所述S-DU发送第三接口消息，所述第三接口消息是所述T-DU在确认切换完成或切换失败后发送的，所述第三接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    和被应用的无线资源控制RRC重配置消息关联的索引或标识；
    用于指示L1/L2切换完成或切换失败的指示信息。
  30. 根据权利要求27所述的方法，其中，所述第二接口消息还包括如下至少之一：
    源小区的标识信息；
    候选小区的标识信息；
    所述终端的标识信息。
  31. 根据权利要求27所述的方法，其中，所述CU向S-DU发送所述第二接口消息之前，所述方法还包括：所述CU向所述S-DU发送第四接口消息，所述第四接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    候选小区为所述终端分配的RACH资源或SRS资源。
  32. 根据权利要求31所述的方法，其中，所述方法还包括：所述CU向所述T-DU发送第五接口消息，所述第五接口消息用于请求所述RACH资源或SRS资源，所述第五接口消息包括如下至少之一：
    所述终端的标识信息；
    源小区的标识信息；
    目标小区的标识信息；
    用于请求RACH资源或SRS资源的指示信息。
  33. 根据权利要求27所述的方法，其中，所述方法还包括：所述CU接收来自于所述S-DU的第六接口消息，所述第六接口消息包括如下至少之一：
    候选小区的标识信息；
    候选小区的L1测量结果；
    候选小区的信道状态信息CSI测量结果；
    所述终端的标识信息。
  34. 根据权利要求27所述的方法，其中，还包括：
    所述CU接收S-DU发送的第一接口消息和下行数据递交状态指示；
    所述CU在接收到S-DU发送的第一接口消息和下行数据递交状态指示后，开始向T-DU发送下行用户数据。
  35. 根据权利要求27所述的方法，其中，还包括：
    所述CU接收来自所述T-DU发送的第三接口消息并确认L1/L2切换完成后，开始向T-DU发送下行用户数据。
  36. 一种切换方法，包括：
    终端监听T-DU的物理下行控制信道PDCCH得到所述T-DU发送的调度请求；
    若所述终端基于所述调度请求成功接收包含目标小区分配的小区无线网络临时标识C-RNTI的PDCCH，则所述终端向所述T-DU发送上行数据。
  37. 根据权利要求36所述的方法，其中，所述上行数据包括如下至少之一：
    混合自动重传请求确认应答HARQ ACK或否定应答NACK；
    CSI报告；
    RRC重配置完成消息；
    与所述终端应用的RRC重配消息关联的索引或标识。
  38. 根据权利要求36所述的方法，其中，所述方法还包括：
    若所述终端基于所述调度请求在第二定时器时长内没有成功接收包含目标小区分配的C-RNTI的PDCCH，则所述终端确认切换失败。
  39. 一种第一网络侧设备，包括：
    通信模块，用于发起L1/L2切换；
    所述通信模块，还用于执行如下至少之一：向T-DU发送第一接口消息，接收第二接口消息；
    其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区定时提前TA值，所述候选小区TA值用于终端切换时的上行同步。
  40. 一种第二网络侧设备，包括：
    通信模块，用于执行如下至少之一：接收第一接口消息，向S-DU发送第二接口消息；
    其中，所述第一接口消息用于指示所述第二网络侧设备对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于所述S-DU发送至终端，所述候选小区TA值用于所述终端切换时的上行同步。
  41. 一种第三网络侧设备，包括：
    通信模块，用于执行如下至少之一：向T-DU发送第一接口消息，向S-DU发送第二接口消息，接收S-DU发送的第一接口消息，接收T-DU发送的第三接口消息；
    其中，所述第一接口消息用于指示所述T-DU对终端进行调度；所述第二接口消息包括候选小区TA值，所述候选小区TA值用于终端切换时的上行 同步。
  42. 一种终端，包括：
    通信模块，用于监听T-DU的PDCCH得到所述T-DU发送的调度请求；
    所述通信模块，还用于若基于所述调度请求成功接收包含目标小区分配的C-RNTI的PDCCH，则向所述T-DU发送上行数据。
  43. 一种终端，包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如权利要求36至38任一项所述的方法的步骤。
  44. 一种网络侧设备，包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如权利要求1至35任一项所述的方法的步骤。
  45. 一种可读存储介质，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时实现如权利要求1至38任一项所述的方法的步骤。
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