WO2023178697A1 - 信息处理方法和终端设备 - Google Patents

信息处理方法和终端设备 Download PDF

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Publication number
WO2023178697A1
WO2023178697A1 PCT/CN2022/083192 CN2022083192W WO2023178697A1 WO 2023178697 A1 WO2023178697 A1 WO 2023178697A1 CN 2022083192 W CN2022083192 W CN 2022083192W WO 2023178697 A1 WO2023178697 A1 WO 2023178697A1
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WIPO (PCT)
Prior art keywords
candidate cell
random access
terminal device
reference signal
cell
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PCT/CN2022/083192
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English (en)
French (fr)
Inventor
尤心
范江胜
李海涛
林雪
Original Assignee
Oppo广东移动通信有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2022/083192 priority Critical patent/WO2023178697A1/zh
Priority to CN202280093803.9A priority patent/CN118872228A/zh
Publication of WO2023178697A1 publication Critical patent/WO2023178697A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • the present application relates to the field of communications, and more specifically, to an information processing method and terminal equipment.
  • the New Radio (NR) system supports the handover process of connected user equipment (User Equipment, UE). For example, switching is performed based on layer one (L1) or layer two (L1) signaling. If the UE and the target cell are not synchronized, the UE still needs to obtain the Timing Advance (TA) of the target cell through random access after receiving the handover command, which may increase the handover delay.
  • UE User Equipment
  • L1 layer one
  • L1 layer two
  • Embodiments of the present application provide an information processing method and a terminal device, which can reduce handover delay.
  • the embodiment of the present application provides an information processing method, including:
  • the terminal device receives the configuration information of the candidate cell
  • the terminal device determines the time advance TA based on the configuration information of the candidate cell.
  • An embodiment of the present application provides a terminal device, including:
  • a receiving unit configured to receive configuration information of the candidate cell
  • a determining unit configured to determine the time advance TA based on the configuration information of the candidate cell.
  • An embodiment of the present application provides a terminal device, including a processor and a memory.
  • the memory is used to store computer programs, and the processor is used to call and run the computer program stored in the memory, so that the terminal device executes the above information processing method.
  • An embodiment of the present application provides a chip for implementing the above information processing method.
  • the chip includes: a processor for calling and running a computer program from the memory, so that the device installed with the chip executes the above information processing method.
  • Embodiments of the present application provide a computer-readable storage medium for storing a computer program.
  • the computer program When the computer program is run by a device, it causes the device to perform the above information processing method.
  • Embodiments of the present application provide a computer program product, which includes computer program instructions.
  • the computer program instructions cause a computer to execute the above information processing method.
  • An embodiment of the present application provides a computer program that, when run on a computer, causes the computer to execute the above information processing method.
  • the embodiment of the present application determines the TA based on the configuration information of the candidate cell, which can reduce the handover delay.
  • Figure 1 is a schematic diagram of an application scenario according to an embodiment of the present application.
  • Figure 2 is a schematic diagram of the switching process based on the Xn interface.
  • Figure 3 is a schematic flow chart of an information processing method according to an embodiment of the present application.
  • Figure 4 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • Figure 5 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • Figure 6 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • Figure 7 is a schematic block diagram of a chip according to an embodiment of the present application.
  • Figure 8 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA broadband code division multiple access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced long term evolution
  • NR New Radio
  • NTN Non-Terrestrial Networks
  • UMTS Universal Mobile Telecommunication System
  • WLAN Wireless Local Area Networks
  • WiFi wireless fidelity
  • 5G fifth-generation communication
  • the communication system in the embodiment of the present application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or an independent ( Standalone, SA) network deployment scenario.
  • Carrier Aggregation, CA Carrier Aggregation, CA
  • DC Dual Connectivity
  • SA Standalone
  • the communication system in the embodiment of the present application can be applied to unlicensed spectrum, where the unlicensed spectrum can also be considered as shared spectrum; or, the communication system in the embodiment of the present application can also be applied to Licensed spectrum, where licensed spectrum can also be considered as unshared spectrum.
  • the embodiments of this application describe various embodiments in combination with network equipment and terminal equipment.
  • the terminal equipment may also be called user equipment (User Equipment, UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.
  • User Equipment User Equipment
  • the terminal device can be a station (ST) in the WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, or a personal digital processing unit.
  • ST station
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites). superior).
  • the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, or an augmented reality (Augmented Reality, AR) terminal.
  • Equipment wireless terminal equipment in industrial control, wireless terminal equipment in self-driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, or wireless terminal equipment in smart home, etc.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices. It is a general term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized devices that can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, and those that only focus on a certain type of application function and need to cooperate with other devices such as smartphones.
  • the network device may be a device used to communicate with mobile devices.
  • the network device may be an access point (Access Point, AP) in WLAN, or a base station (Base Transceiver Station, BTS) in GSM or CDMA.
  • BTS Base Transceiver Station
  • it can be a base station (NodeB, NB) in WCDMA, or an evolutionary base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and an NR network network equipment (gNB) or network equipment in the future evolved PLMN network or network equipment in the NTN network, etc.
  • AP Access Point
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • Evolutional Node B, eNB or eNodeB evolution base station
  • gNB NR network network equipment
  • the network device may have mobile characteristics, for example, the network device may be a mobile device.
  • the network device can be a satellite or balloon station.
  • the satellite can be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geosynchronous orbit (geostationary earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite ) satellite, etc.
  • the network device may also be a base station installed on land, water, etc.
  • network equipment can provide services for a cell, and terminal equipment communicates with the network equipment through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell.
  • the cell can be a network equipment ( For example, the cell corresponding to the base station), the cell can belong to the macro base station, or it can belong to the base station corresponding to the small cell (Small cell).
  • the small cell here can include: urban cell (Metro cell), micro cell (Micro cell), pico cell ( Pico cell), femto cell (Femto cell), etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-rate data transmission services.
  • Figure 1 illustrates a communication system 100.
  • the communication system includes a network device 110 and two terminal devices 120.
  • the communication system 100 may include multiple network devices 110 , and the coverage of each network device 110 may include other numbers of terminal devices 120 , which is not limited in this embodiment of the present application.
  • the communication system 100 may also include other network entities such as a Mobility Management Entity (MME), an Access and Mobility Management Function (AMF), etc.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • network equipment may include access network equipment and core network equipment. That is, the wireless communication system also includes multiple core networks used to communicate with access network equipment.
  • the access network equipment can be a long-term evolution (long-term evolution, LTE) system, a next-generation (mobile communication system) (next radio, NR) system or authorized auxiliary access long-term evolution (LAA- Evolutionary base station (evolutional node B, abbreviated as eNB or e-NodeB) macro base station, micro base station (also known as "small base station"), pico base station, access point (access point, AP), Transmission point (TP) or new generation base station (new generation Node B, gNodeB), etc.
  • LTE long-term evolution
  • NR next-generation
  • LAA- Evolutionary base station evolutional node B, abbreviated as eNB or e-NodeB
  • eNB next-generation
  • NR next-generation
  • LAA- Evolutionary base station evolutional node B, abbre
  • the communication equipment may include network equipment and terminal equipment with communication functions.
  • the network equipment and terminal equipment may be specific equipment in the embodiments of the present application, which will not be described again here; the communication equipment also It may include other devices in the communication system, such as network controllers, mobility management entities and other network entities, which are not limited in the embodiments of this application.
  • the "instruction” mentioned in the embodiments of this application may be a direct instruction, an indirect instruction, or an association relationship.
  • a indicates B which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B. relation.
  • correlate can mean that there is a direct correspondence or indirect correspondence between the two, it can also mean that there is an associated relationship between the two, or it can mean indicating and being instructed, configuration and being. Configuration and other relationships.
  • the NR system supports the handover process (also called handover process) of connected UEs.
  • handover process also called handover process
  • the system must move the user
  • the communication link with the source cell is transferred to the new cell, that is, the handover process is performed.
  • the switching process may include the following stages:
  • the handover preparation includes the handover command generated by the target cell.
  • the source cell does not allow any modification to the handover command generated by the target cell and directly forwards the handover command to the UE.
  • the handover preparation may include:
  • Step 0 AMF provides mobility control information (Mobility control information provided by AMF).
  • the UE context in the source gNB includes information about roaming and access restrictions, which is provided at connection establishment, or at the time of the last TA update.
  • the UE context within the source gNB contains information regarding roaming and access restrictions which were provided either at connection establishment or at the last TA update.
  • Step 1 Measurement Control and Reports.
  • the source gNB configures the UE's measurement process and UE reporting according to the measurement configuration. (The source gNB configures the UE measurement procedures and the UE reports according to the measurement configuration..)
  • Step 2 Handover Decision.
  • the source gNB decides to handover the UE based on the measurement report and Radio Resource Management (RRM) information.
  • RRM Radio Resource Management
  • Step 3 Handover request (HANDOVER REQUEST).
  • the source gNB sends a handover request message to the target gNB through a transparent radio resource control (RRC) container to deliver necessary information for handover preparation. Prepare to switch on the target side.
  • RRC radio resource control
  • the source gNB issues a Handover Request message to the target gNB passing a transparent RRC container with necessary information to prepare the handover at the target side.
  • Step 4 Admission Control.
  • admission control may be performed by the target gNB.
  • Admission Control may be performed by the target gNB.
  • Step 5 Handover request confirmation (HANDOVER REQUEST ACKNOWLEDGE).
  • the target gNB performs handover preparations with L1/L2 and sends a handover request confirmation message to the source gNB.
  • the handover request confirmation message includes a transparent container that is sent to the UE as an RRC message for handover.
  • the target gNB can also indicate whether to accept Dual Active Protocol Stack (DAPS) handover in the handover request confirmation message.
  • DAPS Dual Active Protocol Stack
  • the target gNB prepares the handover with L1/L2 and sends the HANDOVER REQUEST ACKNOWLEDGE to the source gNB, which includes a transparent container to be sent to the UE as an RRC message to perform the handover.
  • the target gNB also indicates if a DAPS handover is accepted.
  • Handover Execution including: the UE executes the handover process immediately after receiving the handover command, that is, the UE disconnects the source cell and connects to the target cell, such as performing random access, sending an RRC handover completion message to the target base station, etc. ; Serial Number (SN) status transfer; data forwarding.
  • the handover execution may include:
  • Step 6 Radio Access Network (RAN) handover initialization (RAN Handover Initiation).
  • the source gNB triggers Uu handover by sending an RRC reconfiguration message to the UE containing the information required to access the target cell.
  • the source gNB triggers the Uu handover by sending an RRCReconfiguration message to the UE, containing the information required to access the target cell.
  • Step 7a Early status transfer (EARLY Status Transfer).
  • DRB Data Radio Bearer
  • the source gNB sends an early state transfer message.
  • the source gNB sends the EARLY STATUS TRANSFER message.
  • Step 7 SN status transfer (SN STATUS TRANSFER).
  • DRB is not configured with DAPS, and the source gNB sends an SN status transfer message to the target gNB to transmit the uplink PDCP SN reception status and downlink PDCP SN transmission status of the DRB applicable to PDCP status preservation to the target GNB.
  • the source gNB sends the SN STATUS TRANSFER message to the target gNB to convey the uplink PDCP SN receiver status and the downlink PDCP SN transmitter status of DRBs for which PDCP status preservation apps)
  • the target cell performs Path Switch with the AMF and User Plane Function (UPF) to release the UE context of the source base station.
  • the handover completion may include:
  • Step 8 RAN Handover Completion.
  • the UE synchronizes with the target cell and completes the RRC handover process by sending an RRC reconfiguration complete message to the target gNB.
  • the UE synchronises to the target cell and completes the RRC handover procedure by sending RRCReconfigurationComplete message to target gNB.
  • Step 8a Handover successful (HANDOVER SUCCESS).
  • the target gNB sends a handover success message to the source gNB to notify that the UE has successfully accessed the target cell.
  • the target gNB sends the HANDOVER SUCCESS message to the source gNB to inform that the UE has successfully accessed the target cell.
  • Step 8b SN status transfer (SN STATUS TRANSFER).
  • the source gNB sends an SN state transfer message to the DRB using configured DAPS, see step 7.
  • the source gNB sends the SN STATUS TRANSFER message for DRBs configured with DAPS for which the description in step 7 apps)
  • Step 9 Path Switch request.
  • the target gNB sends a path switching request message to the AMF to trigger the 5GC (5G core network) to switch the DL data path to the target gNB and establish an NG-C interface instance pointing to the target gNB.
  • the target gNB sends a PATH SWITCH REQUEST message to AMF to trigger 5GC to switch the DL data path toward the target gNB and to establish an NG-C interface instance toward the target gNB.
  • Step 10 Path Switch in UPF(s). 5GC switches the DL data path to the target gNB. UPF sends one or more "end mark” packets on the old path to the source gNB per PDU session/tunnel and is then able to release any U-Plane/TNL resources directed to the source gNB. (5GC switches the DL data path towards the target gNB. The UPF sends one or more "end marker” packets on the old path to the source gNB per PDU session/tunnel and then can release any U-plane/TNL resources towards the source gNB.)
  • Step 11 Path Switch request Acknowledge.
  • AMF uses the path switch request confirmation message to confirm the path switch request message. (The AMF confirms the PATH SWITCH REQUEST message with the PATH SWITCH REQUEST ACKNOWLEDGE message.)
  • Step 12.UE Context Release (UE Context Release).
  • the target gNB After receiving the path switch request confirmation message from the AMF, the target gNB sends a UE context release to notify the source gNB that the switch is successful. The source gNB may then release the radio and C-plane related resources associated with the UE context. Any data forwarding in progress can continue.
  • the target gNB Upon reception of the PATH SWITCH REQUEST ACKNOWLEDGE message from the AMF, the target gNB sends the UE CONTEXT RELEASE to inform the source gNB about the success of the handover. The source gNB can then release radio and C-plane related resources associated to the UE context.Any ongoing data forwarding may continue.
  • NR R18 supports handover based on L1 and/or L2.
  • Handover based on L1 and/or L2 is mainly aimed at intra-centralized unit (Central Unit, CU) scenarios.
  • CU Switching is performed based on layer one or layer two signaling while (PDCP/key) remains unchanged.
  • the UE For L1 and/or L2 handovers, if the UE and the target cell are not synchronized, the UE still needs to obtain the TA (time advance) of the target cell through random access. Then the handover delay will be due to the random access process. greatly increase. In the embodiment of this application, the UE can obtain the TA in advance.
  • FIG 3 is a schematic flow chart of an information processing method 300 according to an embodiment of the present application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least part of the following.
  • the terminal device receives the configuration information of the candidate cell.
  • the terminal device determines the time advance (TA) based on the configuration information of the candidate cell.
  • the terminal device may receive a radio resource control (RRC) reconfiguration message from a network device, such as a source cell, where the RRC reconfiguration message includes configuration information of the candidate cell. Based on receiving the configuration information of the candidate cell, the terminal device may determine the TA used by the terminal device in the candidate cell before handover.
  • the configuration information of the candidate cells may include configuration information of one or more candidate cells. Multiple candidate cells may include one or more target cells.
  • the terminal device determines the TA based on the configuration information of the candidate cell, including: the terminal device sends a first reference signal to at least one candidate cell based on the configuration information of the candidate cell.
  • the first reference signal Used to determine the TA.
  • the configuration information of the candidate cell may include an identifier of a candidate cell, and the terminal device may send the first reference signal to this candidate cell.
  • the configuration information may include identifiers of N candidate cells, where N is a positive integer greater than or equal to 1.
  • the terminal equipment may send the first reference signal to the N candidate cells, or may send the first reference signal to some of the N candidate cells.
  • the terminal device sends a first reference signal to at least one candidate cell based on the configuration information of the candidate cell, including: the terminal device passes a first time period after receiving the configuration information of the candidate cell. Then, the first reference signal is sent to at least one candidate cell.
  • the first time period is determined by a first timer, and the starting point of the first time period is the moment when the terminal device starts the first timer when receiving the configuration information of the candidate cell.
  • the end point of the first time period is the time when the terminal device sends the first reference signal to at least one candidate cell when the first timer expires.
  • the terminal device when receiving the configuration information of the candidate cell, the terminal device starts the first timer.
  • the duration of the first timer may be preset or configured by the network. If the first timer times out, the terminal device sends a first reference signal to at least one candidate cell.
  • each candidate cell corresponds to one first timer.
  • the terminal device may start multiple first timers if the configuration information includes identifiers of multiple candidate cells.
  • the identifiers of N candidate cells included in the configuration information can start N or M first timers. M is a positive integer less than N.
  • the duration of the first timer is related to the movement trajectory of the terminal device and the coverage of the candidate cell. For example, for a terminal device on a specific running trajectory, the network device may trigger the transmission of the first reference signal when the terminal device is about to and/or has just arrived in the coverage area of the cell.
  • the terminal device determines the TA based on the configuration information of the candidate cell, including: the terminal device sends a first reference signal to at least one candidate cell based on the configuration information of the candidate cell and a first condition, the first The reference signal is used to determine the TA.
  • the first condition includes at least one of the following:
  • the signal quality of the source cell is less than or equal to the first threshold
  • the signal quality of the candidate cell is greater than or equal to the second threshold.
  • the first threshold may be the source cell threshold
  • the second threshold may be the candidate cell threshold.
  • the terminal device may determine whether to send the first reference signal based on whether the source cell satisfies the first condition. It may also determine whether to send the first reference signal based on whether the candidate cell satisfies the first condition. It may also determine whether to send the first reference signal based on whether the source cell and the candidate cell both satisfy the first condition.
  • the condition determines whether to send the first reference signal. If the signal quality of the source cell is poor, for example, the signal quality of the source cell is less than or equal to the first threshold, the source cell may be considered to satisfy the first condition. If the signal quality of the candidate cell is good, for example, the signal quality of the candidate cell is greater than or equal to the second threshold, the candidate cell may be considered to satisfy the first condition.
  • the terminal device sends a first reference signal to at least one candidate cell based on the configuration information of the candidate cell and the first condition, including at least one of the following:
  • the terminal equipment When the signal quality of the source cell is less than or equal to the first threshold, the terminal equipment sends the first reference signal to all candidate cells;
  • the terminal equipment When the signal quality of the candidate cell is greater than or equal to the second threshold, the terminal equipment sends the first reference signal to the candidate cell whose signal quality is greater than or equal to the second threshold;
  • the terminal device When the signal quality of the source cell is less than or equal to the first threshold and the signal quality of the candidate cell is greater than or equal to the second threshold, the terminal device sends the first reference signal to the candidate cell whose signal quality is greater than or equal to the second threshold.
  • the terminal device may need to switch.
  • the terminal device can send the first reference signal to all N candidate cells to obtain the TA in advance, thereby reducing the need to obtain the TA during the handover process. Handover delay caused by TA executing random access process. If the signal quality of the source cell is greater than the first threshold, the terminal device may not need to switch, and the terminal device may not send the first reference signal to the candidate cell. In this case, the signal quality of the candidate cells does not need to be compared.
  • the first reference signal may be sent to one or more of the M candidate cells.
  • one or more of the M candidate cells may be The cell sends the first reference signal.
  • the method further includes: the terminal device reporting to the network device the identity of the candidate cell that satisfies the first condition.
  • the terminal device can send the identifiers of these M candidate cells to the network device.
  • the network device may select one or more indications from the identifiers of the M candidate cells to the terminal device.
  • the terminal device sends the first reference signal to the cells corresponding to the identifiers indicated by the network device.
  • the method further includes: the terminal device receiving a first indication from the network device, the first indication being used to indicate whether to initiate a random access process to the candidate cell that meets the first condition, and/ Or, used to indicate random access resources.
  • the first instruction may instruct the terminal device to initiate a random access process (which may also be called RACH, random access, random access process, etc.) to all candidate cells that meet the first condition, and the terminal device may initiate a random access process to all candidate cells that meet the condition.
  • a candidate cell sends a first reference signal such as a random access preamble.
  • the first indication may indicate the random access resources used for this random access.
  • the first instruction may instruct the terminal device to initiate a random access process to some of the M candidate cells that meet the first condition, such as cells C1 and C2, and the terminal device may send a random access preamble to cells C1 and C2. code.
  • the terminal device determines the TA based on the configuration information of the candidate cell, including: the terminal device sends a first reference signal to the first candidate cell based on the configuration information of the candidate cell and a second indication, and the first The reference signal is used to determine the TA.
  • the method further includes:
  • the terminal device receives the second indication, which is carried through MAC CE and/or DCI.
  • the second indication and the configuration information of the candidate cell may be sent at the same time, or the second indication may be sent later than the configuration information of the candidate cell.
  • the terminal device may receive the second indication and the configuration information of the candidate cell at the same time, or may receive the second indication and the configuration information of the candidate cell separately.
  • the terminal device receives RRC and MAC CE at the same time, where RRC carries the configuration information of the candidate cell, and MAC CE carries the second indication.
  • the terminal equipment receives RRC and DCI successively, where the RRC carries the configuration information of the candidate cell, and the DCI carries the second indication.
  • the second indication includes at least one of an identity of the first candidate cell and a random access resource.
  • At least two of the first timer, the first condition and the second indication may be combined.
  • the first timer and the first condition can be combined.
  • the terminal device detects that the first timer has expired and the source cell meets the first condition, and then sends the first reference signal to all candidate cells.
  • the terminal device detects that the first timer has expired and the candidate cell satisfies the first condition, and then sends the first reference signal to the candidate cell that satisfies the first condition.
  • the terminal device detects that the first timer has expired and the source cell and the candidate cell meet the first condition, and then sends the first reference signal to the candidate cell that meets the first condition.
  • the terminal device starts a corresponding first timer for each candidate cell.
  • the terminal device then sends the first reference signal to the candidate cell. . If the first timer of a certain candidate cell times out but the candidate cell does not meet the first condition, the first reference signal is not sent to the candidate cell.
  • the first timer and the second indication can be combined.
  • the terminal device detects that the first timer has expired and receives the second indication, and then sends the first reference signal to at least one candidate cell.
  • the terminal device starts a corresponding first timer for each candidate cell. If the first timer of a candidate cell times out and the second indication is received, the terminal device sends the first reference signal to the candidate cell. If the first timer of a certain candidate cell times out but the second indication is received, the first reference signal is not sent to the candidate cell.
  • the second indication and the first condition can be combined. For example, after the terminal equipment receives the second indication and the source cell meets the first condition, the terminal device then sends the first reference signal to all candidate cells indicated by the second indication. For another example, the terminal equipment receives the second indication and the candidate cell indicated by the second indication satisfies the first condition, and then sends the first reference signal to the candidate cell indicated by the second indication that satisfies the first condition. For another example, the terminal equipment receives the second indication and the source cell and the candidate cell indicated by the second indication satisfy the first condition, and then sends the first reference signal to the candidate cell indicated by the second indication that satisfies the first condition.
  • the first timer, the first condition and the second indication can be combined.
  • the terminal equipment detects that the first timer has expired, the source cell meets the first condition, and the second indication is received, and then sends the first reference signal to all candidate cells indicated by the second indication.
  • the terminal equipment detects that the first timer has expired, that the candidate cell satisfies the first condition, and receives the second indication, and then sends the first reference signal to the candidate cell that satisfies the first condition indicated by the second indication.
  • the terminal equipment detects that the first timer has expired, the source cell and the candidate cell meet the first condition, and receives the second indication, and then sends the first reference signal to the candidate cell that satisfies the first condition indicated by the second indication.
  • the terminal device starts the corresponding first timer for each candidate cell. If the first timer of a candidate cell times out, the candidate cell meets the first condition and receives the second instruction, the terminal device then sends a message to the candidate cell. The cell sends the first reference signal. If the first timer of a certain candidate cell times out, but the candidate cell does not meet the first condition or does not receive the second indication, the first reference signal is not sent to the candidate cell.
  • the method further includes: after sending the first reference signal, the terminal device listens to a random access response (Random Access Response, RAR) window to receive the RAR, which includes the TA, the cell wireless network At least one of the temporary identifier C-RNTI and the uplink authorization UL GRANT.
  • RAR Random Access Response
  • a contention-based random access process and/or a non-contention-based random access process may be adopted.
  • the terminal device sends a random access request to the network (which may include a random access preamble)
  • the RAR window can be listened to to receive RAR.
  • the RAR does not need to carry the uplink grant (UL GRANT).
  • the method further includes: after sending the first reference signal, the terminal device monitors the physical downlink control channel (PDCCH) within the RAR window to receive the RAR, which includes TA, C-RNTI, At least one of UL GRANT, wherein the UL GRANT carried in the RAR is used when the terminal device sends an uplink message to the candidate cell.
  • PDCCH physical downlink control channel
  • the method further includes: the terminal device does not expect to receive RAR after sending the first reference signal.
  • the candidate cell that receives the first reference signal sends the TA to the source cell through the Xn interface, so that the source cell carries the TA when sending the handover command.
  • the candidate cell C3 sends the TA of the candidate cell determined using the first reference signal to the source cell of the terminal equipment through the Xn interface. If the candidate cell is the target cell for handover, the source cell carries the TA of the candidate cell when sending a handover command to the terminal device.
  • the configuration information of the candidate cell includes resource configuration information for sending the first reference signal.
  • the first reference signal includes a random access preamble.
  • the resource configuration information includes random access resources.
  • the random access resources include at least one of the following: beam identifiers; code domain resources; time and frequency domain resources.
  • the beam identifier includes at least one of a synchronization signal block (Synchronization Signal and PBCH block, SSB) index and a channel state information measurement reference signal (Channel State Information-Reference Signal, CSI-RS) index.
  • a synchronization signal block Synchronization Signal and PBCH block, SSB
  • CSI-RS Channel State Information-Reference Signal
  • the code domain resource includes a preamble index.
  • the time-frequency domain resources include random access opportunities (RACH occasions).
  • the random access resource is used to implicitly indicate that this random access process is used to obtain the TA for handover.
  • the random access resource is a specific resource (L1/L2 mobility TA acquire specific) acquired by layer one (L1) and/or layer two (L2) mobility TA.
  • the random access resource is used Yu indicates the TA used for L1 and/or L2 handover in this random access process. For example, after the network receives the preamble sent using L1/L2 mobility TA acquire specific random access resources, it knows that the random access process is used to obtain the TA for L1 and/or L2 handover.
  • the random access resources include contention-based random access resources and/or non-contention-based random access resources.
  • the contention-based random access resource is carried through the system message SIB1 of the candidate cell.
  • the non-contention-based random access resources include at least one of the following:
  • Random access channel RACH resources Random access channel RACH resources; SSB index; preamble index.
  • the first reference signal includes a channel sounding reference signal (Sounding Reference Signal, SRS).
  • SRS Sounding Reference Signal
  • the candidate cell can feed back the TA to the source cell, and the source cell carries the TA in the handover command (HO command) sent to the terminal device.
  • the resource configuration information includes at least one of the following: resource identification (resource ID), period, bandwidth, time-frequency resource, transmission port, path loss reference signal, and starting position.
  • the resource configuration information in the configuration information of the candidate cell received by the terminal device includes one or more of resource identification, period, bandwidth, time-frequency resources, transmission port, path loss reference signal, and starting position.
  • the resource configuration information may send SRS to one or more candidate cells.
  • the configuration information of the candidate cell includes scheduling information of SIB1 and/or SIB9 of the candidate cell.
  • the method further includes: the terminal device receiving the SIB9 of the candidate cell based on the scheduling information.
  • the terminal device can calculate the TA by itself based on the configuration information of the candidate cell.
  • the terminal device may receive the system information of the candidate cell, such as SIB9, based on the scheduling information in the configuration information of the candidate cell, and then calculate the TA based on the time information in the system information, such as the propagation delay.
  • the method further includes: the terminal device itself triggers reception of SIB9 of the candidate cell.
  • the terminal device can trigger itself to receive the system information of the candidate cell, such as SIB9, and then calculate the TA based on the time information in the system information, such as the propagation delay.
  • the method further includes: the terminal device determining whether to receive the SIB9 of the candidate cell and/or the identification of the candidate cell that needs to receive the SIB9 based on a third indication from the network device.
  • the terminal device may receive the third instruction from the network device.
  • the third indication may indicate whether the terminal device receives the SIB9 of the candidate cell. If the third indication indicates that the terminal device receives SIB9 of the candidate cells, the terminal device may receive SIB9 of one or more candidate cells. If the third indication indicates that the terminal device does not receive the SIB9 of the candidate cell, the terminal device may refuse to receive the SIB9 of the candidate cell.
  • the third indication may also specifically indicate which candidate cell or cells the terminal device receives SIB9. If the third indication indicates that the terminal device receives SIB9 of candidate cells C1 and C2, the terminal device may receive SIB9 of candidate cells C1 and C2 without receiving SIB9 of other cells.
  • the SIB9 includes Coordinated Universal Time (Coordinated Universal Time, UTC), and the terminal device determining the TA based on the configuration information of the candidate cell includes: the terminal device determines the propagation delay based on the UTC in the SIB9, and Determine TA based on this propagation delay.
  • the propagation delay of SIB9 from the network device to the terminal device can be calculated based on the UTC in SIB9.
  • TA can be equal to twice the propagation delay.
  • Propagation delay is calculated by subtracting the UTC indicated in SIB9 from the time the end device receives SIB9.
  • the configuration information of the candidate cell also includes measurement gap (Measurement Gap, MG) configuration information.
  • the MG may also be requested by the terminal device.
  • the network is pre-configured with multiple sets of MGs, and the terminal device can indicate which set of MGs to use through MAC CE or DCI.
  • the terminal device can use the MG or request the MG when it needs to receive system messages of the candidate cell or send random access/SRS to the candidate cell.
  • the method further includes: the terminal device reporting the TA. For example, after obtaining the TA of the candidate cell, the terminal device may report the TA of the candidate cell to the network device.
  • candidate cells include cells that can be selected as target cells.
  • the number of target cells can be multiple or one. If the terminal device needs to be switched from the source cell to the target cell, the terminal device can select the target cell itself, or the network side can select the target cell for the terminal device. In some cases, all candidate cells may not be suitable as target cells, and the target cell needs to be selected from outside the candidate cells.
  • the method further includes: when the terminal device receives a switching command, determining whether the TA obtained by the terminal device is valid based on the second condition.
  • the terminal device when receiving the switching command, it can be determined based on the second condition that the terminal device acquires the TA in any of the above ways (for example, sending the third Is a reference signal or TA calculated based on UTC in SIB9 valid? If the terminal device obtains it effectively, it can be used in handover; otherwise, it can reacquire TA.
  • determining whether the TA obtained by the terminal device is valid based on the second condition includes at least one of the following:
  • the TA obtained by the terminal device is valid
  • the TA acquired by the terminal device is invalid, and the terminal device initiates a random access process to re-obtain the TA.
  • the second condition includes at least one of the following:
  • Whether the difference between the RSRP when the first reference signal is sent and the RSRP when L1 and/or L2 signaling is received is greater than a third threshold.
  • the second condition is met. If the second timer is not started, paused or times out, the second condition is not met. For another example, if the difference between RSRP1 when the first reference signal is sent and RSRP2 when L1 and/or L2 signaling is received is greater than the third threshold, then the second condition is met. If the difference between RSRP1 and RSRP2 is less than or equal to the third threshold, the second condition is not met. For another example, if the second timer is in the running state and the difference between RSRP1 and RSRP2 is greater than the third threshold, the second condition is met.
  • the second timer is started after the terminal device sends the first reference signal. For example, the terminal device starts the second timer after sending the first reference signal.
  • the TA obtained by the terminal device using any of the above methods is valid. If the terminal device receives the switching command after the second timer times out, the TA obtained by the terminal device using any of the above methods is invalid and needs to obtain the TA again.
  • the switching command is L1 signaling and/or L2 signaling.
  • the handover command is carried via MAC CE and/or DCI.
  • the switching command includes at least one of the following:
  • C-RNTI Cell Radio Network Temporary Identity
  • TCI Transmission Configuration Indication
  • the terminal device can perform switching based on the TA in the switching command when switching.
  • the common channel includes a common PDCCH and/or a common PDSCH;
  • the TCI status of the terminal equipment dedicated channel includes at least one of the following: the TCI status of the PDCCH dedicated to the terminal equipment, the TCI status of the PDSCH dedicated to the terminal equipment, the TCI status of all PUSCHs, and the TCI status of all PUCCHs.
  • the configuration information of the candidate cell also includes at least one of the following:
  • Candidate cell security algorithm information of the selected security algorithm
  • the TA includes a TA of a target cell of the terminal device.
  • the terminal device can obtain the TA of the candidate cell in advance, and then can obtain the TA of the target cell when receiving the handover command or before receiving the handover command, thereby realizing synchronization between the terminal device and the target cell and reducing handovers. time delay.
  • FIG. 4 is a schematic block diagram of a terminal device 400 according to an embodiment of the present application.
  • the terminal device 400 may include:
  • the receiving unit 410 is used to receive the configuration information of the candidate cell
  • the determining unit 420 is configured to determine the time advance TA based on the configuration information of the candidate cell.
  • the determining unit 420 includes:
  • the first sending subunit 510 is configured to send a first reference signal to at least one candidate cell based on the configuration information of the candidate cell.
  • the first reference signal is used to determine the TA.
  • the first sending subunit 510 is configured to send the first reference signal to at least one candidate cell after a first period of time has elapsed after receiving the configuration information of the candidate cell.
  • the first time period is determined by a first timer, and the starting point of the first time period is the moment when the terminal device starts the first timer when receiving the configuration information of the candidate cell.
  • the end point of the first time period is the time when the terminal device sends the first reference signal to at least one candidate cell when the first timer expires.
  • each candidate cell corresponds to one first timer, and the duration of the first timer is related to the movement trajectory of the terminal device and the coverage of the candidate cell.
  • the determining unit 420 includes:
  • the second sending subunit 520 is configured to send a first reference signal to at least one candidate cell based on the configuration information of the candidate cell and the first condition.
  • the first reference signal is used to determine the TA.
  • the first condition includes at least one of the following:
  • the signal quality of the source cell is less than or equal to the first threshold
  • the signal quality of the candidate cell is greater than or equal to the second threshold.
  • the second sending subunit 520 is configured to perform at least one of the following:
  • the first reference signal is sent to the candidate cell whose signal quality is greater than or equal to the second threshold.
  • the device further includes:
  • the first reporting unit 430 is configured to report the identity of the candidate cell that meets the first condition to the network device.
  • the receiving unit 410 is further configured to receive a first indication from the network device, where the first indication is used to indicate whether to initiate a random access process to the candidate cell that meets the first condition, and/ Or, used to indicate random access resources.
  • the determining unit 420 includes:
  • the third sending subunit 530 is configured to send a first reference signal to the first candidate cell based on the configuration information of the candidate cell and the second indication.
  • the first reference signal is used to determine the TA.
  • the receiving unit 410 is also configured to receive the second indication, which is carried through MAC CE and/or DCI.
  • the second indication includes at least one of an identity of the first candidate cell and a random access resource.
  • the device further includes:
  • the first monitoring unit 440 is configured to monitor the RAR window after sending the first reference signal to receive the RAR.
  • the RAR includes at least one of the TA, the cell radio network temporary identifier C-RNTI, and the uplink grant UL GRANT.
  • the device further includes:
  • the second monitoring unit 450 is configured to monitor the physical downlink control channel PDCCH within the RAR window after sending the first reference signal to receive the RAR.
  • the RAR includes at least one of TA, C-RNTI, and UL GRANT, where, The UL GRANT carried in the RAR is used when the terminal device sends an uplink message to the candidate cell.
  • the configuration information of the candidate cell includes resource configuration information for sending the first reference signal.
  • the first reference signal includes a random access preamble.
  • the resource configuration information includes random access resources.
  • the random access resources include at least one of the following: beam identifiers; code domain resources; time and frequency domain resources.
  • the beam identifier includes at least one of a synchronization signal block SSB index and a channel state information measurement reference signal CSI-RS index.
  • the code domain resource includes a preamble index.
  • the time-frequency domain resources include random access opportunities.
  • the random access resource is used to implicitly indicate that this random access process is used to obtain the TA for handover.
  • the random access resource is a specific resource obtained by L1 and/or L2 mobility TA, and the random access resource is used to indicate that the current random access process is used for L1 and/or L2 handover. TA.
  • the random access resources include contention-based random access resources and/or non-contention-based random access resources.
  • the contention-based random access resource is carried through the system message SIB1 of the candidate cell.
  • the non-contention-based random access resources include at least one of the following: random access channel RACH resources; SSB index; preamble index.
  • the first reference signal includes a channel sounding reference signal SRS.
  • the resource configuration information includes at least one of the following: resource identification, period, bandwidth, time-frequency resource, transmission port, path loss reference signal, and starting position.
  • the configuration information of the candidate cell includes scheduling information of SIB1 and/or SIB9 of the candidate cell.
  • the receiving unit 410 is further configured to receive the SIB9 of the candidate cell based on the scheduling information.
  • the receiving unit 410 is also configured to trigger the reception of the SIB9 of the candidate cell by itself.
  • the determining unit 420 is further configured to determine whether to receive the SIB9 of the candidate cell and/or the identification of the candidate cell that needs to receive the SIB9 based on a third indication from the network device.
  • the SIB9 includes coordinated universal time UTC
  • the determining unit 420 is further configured to determine the propagation delay based on the UTC in the SIB9, and determine the TA based on the propagation delay.
  • the configuration information of the candidate cell also includes measurement gap configuration information.
  • the device further includes: a second reporting unit 460, configured to report the TA.
  • the determining unit 420 is further configured to determine whether the TA obtained by the terminal device is valid based on the second condition when a switching command is received.
  • the determining unit 420 is further configured to perform at least one of the following:
  • the second condition is not met, it is determined that the TA obtained by the terminal device is invalid, a random access process is initiated, and the TA is reacquired.
  • the second condition includes at least one of the following:
  • Whether the difference between the RSRP when the first reference signal is sent and the RSRP when L1 and/or L2 signaling is received is greater than a third threshold.
  • the second timer is started after the terminal device sends the first reference signal.
  • the switching command is L1 signaling and/or L2 signaling.
  • the handover command is carried via MAC CE and/or DCI.
  • the switching command includes at least one of the following:
  • the TCI status of the terminal equipment s dedicated channel and/or public channel;
  • the common channel includes a common PDCCH and/or a common PDSCH;
  • the TCI status of the terminal equipment dedicated channel includes at least one of the following: the TCI status of the PDCCH dedicated to the terminal equipment, the TCI status of the PDSCH dedicated to the terminal equipment, the TCI status of all PUSCHs, and the TCI status of all PUCCHs.
  • the configuration information of the candidate cell also includes at least one of the following:
  • Candidate cell security algorithm information of the selected security algorithm
  • the TA includes a TA of a target cell of the terminal device.
  • the terminal devices 400 and 500 in the embodiment of the present application can implement the corresponding functions of the terminal device in the foregoing method 300 embodiment.
  • each module (sub-module, unit or component, etc.) in the terminal device 400, 500 please refer to the corresponding description in the above method embodiment, and will not be described again here.
  • the functions described with respect to each module (sub-module, unit or component, etc.) in the terminal devices 400 and 500 of the application embodiment can be implemented by different modules (sub-module, unit or component, etc.), or can be implemented by Implemented by the same module (submodule, unit or component, etc.).
  • Example 1 Send preamble to all candidate cells in the RRC reconfiguration message
  • the terminal receives the candidate cell configured by the network.
  • the candidate cell configuration includes at least one of the following: candidate cell identity, new C-RNTI, candidate cell security algorithm information of the selected security algorithm, dedicated random access resources, random access resources.
  • the terminal sends a first reference signal (such as a preamble or SRS) to at least one candidate cell, and the first reference signal is used to determine the TA of the terminal.
  • the at least one candidate cell may be all or part of the candidate cells configured by the network. For example, after receiving the candidate cell configuration from the network side, the terminal sends the first reference signal to all candidate cells in the configuration.
  • the terminal may send the first reference signal to all candidate cells after a first period of time (first timer expires) after receiving the candidate cell configuration from the network side.
  • first timer expires
  • the terminal starts a first timer after receiving configuration information from the network side (information for configuring candidate cells).
  • the terminal sends a first reference signal to all candidate cells.
  • the configuration granularity of the timer may also be per candidate cell. That is to say, each candidate cell can maintain a corresponding first timer.
  • the network can trigger the transmission of the first reference signal when the terminal is about to/just arrives in the coverage area of the cell. That is to say, the duration of the first timer is related to the movement trajectory of the terminal and the candidate cell coverage.
  • the terminal may send the first reference signal to at least one candidate cell through a random access process, that is to say, the first reference signal may be a random access preamble.
  • the random access process may be contention-based random access or non-contention random access.
  • the type of the random access process may include two-step (2-step) or four-step (4-step) random access.
  • the random access resource used for this random access can be specific (L1/L2 mobility TA acquire specific) obtained by L1 and/or L2 mobility TA, so that the network knows it after receiving the preamble sent by the terminal. This random access procedure is used to obtain TA for L1 and/or L2 handover.
  • the configuration information also includes resource configuration information for sending the first reference signal.
  • the resource configuration information can be a random access resource, such as a beam identifier (SSB/CSI-RS index), a code domain resource (preamble index), or a time-frequency domain resource (RACH occasion). at least one of.
  • SSB/CSI-RS index beam identifier
  • preamble index code domain resource
  • RACH occasion time-frequency domain resource
  • the relevant configuration and resources used by the random access process can be determined in the following ways:
  • Method 1 The network carries this configuration when configuring the candidate cell. That is to say, the candidate cell configuration information includes random access related configurations, which can be competing random access resources such as SIB1 of the candidate cell; it can also be Based on non-contention random access resources, the network can carry RACH resources, SSB index, preamble index, etc. in the candidate cell configuration.
  • the candidate cell configuration information includes random access related configurations, which can be competing random access resources such as SIB1 of the candidate cell; it can also be Based on non-contention random access resources, the network can carry RACH resources, SSB index, preamble index, etc. in the candidate cell configuration.
  • Method 2 The terminal determines a candidate cell that meets the conditions and reports it to the network side, and then the network instructs the terminal whether to initiate a random access process and/or random access resources to the cell.
  • the terminal can perform at least one of the following:
  • Method 1 (Option 1): The terminal does not expect to receive the RAR sent by the candidate cell after sending the first reference signal. That is to say, the candidate cell can pass the obtained TA through the Xn interface after receiving the first reference signal sent by the terminal. Sent to the source cell to carry the TA when the source cell sends a handover command.
  • Method 2 After sending the first reference signal, the terminal normally monitors the RAR window (window) to receive RAR.
  • the RAR does not need to carry the UL authorization (Grant).
  • Method 3 After sending the first reference signal, the terminal normally monitors the PDCCH in the RAR window to receive the RAR; the UL grant carried in the RAR can be used when the UE subsequently sends uplink messages to the target network.
  • the resource configuration information of the first reference signal includes one or more of resource identification, period, bandwidth, time-frequency resource, transmission port, path loss reference signal, starting position, etc.
  • the terminal receives the switching command sent by the network and performs cell switching.
  • the switching command may be L1 and/or L2 signaling, such as MAC CE or DCI.
  • the handover command may include the identity of the target cell, TA (if the UE calculates it by itself, it may not be carried), C-RNTI, common PDCCH/PDSCH and/or UE-dedicated PDCCH/PDSCH and all PUSCH/PUCCH) TCI state, SCELL activation and deactivation information and corresponding TCI state, etc. This switching process also applies to Examples 2 to 5 described below.
  • the terminal receives the candidate cell configuration sent by the network and the first condition information of the network configuration.
  • the first condition includes the source cell threshold and/or the candidate cell threshold; the terminal sends a first reference signal (such as preamble) to the candidate cell based on the first condition.
  • the terminal When the candidate cell meets the first condition of network configuration, the terminal sends the first reference signal to the cell. That is to say, the terminal monitors the signal strength of all candidate cells configured in the network. When the candidate cell threshold is met (for example, the signal quality of the candidate cell is greater than or equal to the candidate cell threshold), the terminal sends the first reference signal to the candidate cell that meets the conditions.
  • the terminal When the source cell meets the first condition of network configuration, the terminal sends the first reference signal to the candidate cell. That is to say, the terminal monitors the signal strength of the source cell. When the source cell threshold is met (for example, the signal quality of the source cell is less than or equal to the source cell threshold), the terminal sends the first reference signal to all candidate cells.
  • the terminal sends the first reference signal to the candidate cell (for example, the candidate cell whose signal quality is greater than or equal to the threshold of the candidate cell).
  • the terminal may also indicate to the network side the information of the candidate cell to which the terminal wants to send the first reference signal.
  • the first condition may include cell channel quality, for example, may be at least one of RSRP, RSRQ, SINR, etc.
  • the first condition can be a relative condition or an absolute condition.
  • the absolute condition may include a comparison of the cell channel quality with a certain threshold; the relative condition may include a comparison of the change in cell channel quality with a certain threshold.
  • the first reference signal sent by the terminal to the candidate cell that meets the conditions may pass the random access process, that is to say, the first reference signal may be a random access preamble.
  • the random access process may be contention-based random access or non-contention random access.
  • the type of the random access process includes 2-step or 4-step random access, and the random access resources used in the random access can be L1/L2 mobility TA acquire specific. In this way, after the network receives the preamble sent by the terminal, it knows that the random access process is used to obtain the TA for L1 and/or L2 handover.
  • the relevant configuration and resources used by the random access process can be determined in the following ways:
  • the network carries this configuration when configuring the candidate cell. That is to say, the candidate cell configuration information includes random access related configurations. It can be a competitive random access resource such as SIB1 of the candidate cell; it can also be based on non-contention. For random access resources, the network can carry RACH resources, SSB index, preamble index, etc. in the candidate cell configuration.
  • the candidate cell configuration information includes random access related configurations. It can be a competitive random access resource such as SIB1 of the candidate cell; it can also be based on non-contention.
  • the network can carry RACH resources, SSB index, preamble index, etc. in the candidate cell configuration.
  • Option 2 The terminal determines a candidate cell that meets the conditions and reports it to the network side, and then the network instructs the terminal whether to initiate a random access process and/or random access resources to the cell.
  • the terminal can perform at least one of the following:
  • Option 1 The terminal does not expect to receive the RAR sent by the candidate cell after sending the first reference signal. That is to say, the candidate cell can send the obtained TA to the source cell through the Xn interface after receiving the first reference signal sent by the terminal. Used to carry TA when the source cell sends a handover command.
  • Option 2 The terminal normally monitors the RAR window after sending the first reference signal to receive RAR.
  • the RAR does not need to carry UL Grant;
  • Option 3 After sending the first reference signal, the terminal normally monitors the PDCCH in the RAR window to receive the RAR; the UL grant carried in the RAR can be used when the UE subsequently sends uplink messages to the target network.
  • the terminal receives the candidate cell configuration sent by the network and the instruction information sent by the network, where the instruction information is used to instruct the terminal to send the first reference signal to the candidate cell.
  • the terminal sends the first reference signal to the candidate cell based on the network indication.
  • the indication information may be sent simultaneously with the candidate cell configuration or later than the configuration information of the candidate cell.
  • the indication information may be MAC CE or DCI, including candidate cell identifiers and/or RACH resources, etc.
  • the first reference signal sent by the terminal to the candidate cell indicated by the network can pass a random access process, that is to say, the first reference signal can be a random access preamble, and the random access process can be contention-based random access or non-random access. Contention random access.
  • the type of random access process includes 2-step or 4-step RACH.
  • the RACH resources used in this random access can be L1/L2 mobility TA acquire specific, so that the network receives the preamble sent by the terminal. Then it is known that the random access process is used to obtain the TA for L1 and/or L2 handover.
  • the terminal receives candidate cell configuration information, and the configuration information includes SIB1 and/or SIB9 scheduling information of the candidate cell.
  • the terminal receives the SIB9 of the candidate cell based on the scheduling information.
  • the configuration information may also include measurement gap (Measurement gap) configuration information.
  • the SIB9 includes the UTC time, and the terminal determines the propagation delay based on the UTC time of the system message broadcast of the candidate cell and further determines the TA.
  • the UE receiving the SIB9 of the candidate cell may be triggered by the UE itself. For example, in conjunction with Example 1 or 2, the UE receives the SIB9 of at least one candidate cell. Alternatively, the terminal may determine whether to receive the SIB9 of the candidate cell based on the network indication, and further determine which candidate cell to receive the SIB9 based on the network indication.
  • the terminal can indicate the size of the TA to the network side.
  • SIB9 contains information related to GPS time and Coordinated Universal Time (UTC).
  • the UE may use the parameters provided in this system information block to obtain UTC, GPS and local time (SIB9 contains information related to GPS time and Coordinated Universal Time (UTC).
  • SIB9 contains information related to GPS time and Coordinated Universal Time (UTC).
  • the UE may use the parameters provided in this system information block to obtain the UTC, the GPS and the local time.).
  • the UE may use the time information for numerous purposes, possibly involving upper layers, e.g. to assist GPS initialisation, to synchronize the UE clock (NOTE: The UE may use the time information for numerous purposes, possibly involving upper layers e.g. to assist GPS initialisation, to synchronize the UE clock.). See the following example of the SIB9 information element.
  • UTC can be obtained from the SIB9 UTC time information field such as timeInfoUTC.
  • SIB9 information element An example of a SIB9 information element is as follows:
  • SIB9 examples of some field descriptions of SIB9 are as follows:
  • this solution further includes:
  • the terminal When the terminal receives the L1 and/or L2 switching command, it determines whether one of the following conditions is met. If satisfied, the TA determined by sending the first reference signal in the target cell is considered valid. Otherwise, you need to re-initiate RACH to the target cell to obtain a valid TA:
  • the terminal After sending the first reference signal to each target cell, the terminal starts the second timer, and the second timer is started for each target cell. During the running period of the second timer, if the terminal receives L1 and/or L2 signaling instructing the terminal to switch to the corresponding target cell, the terminal determines whether to initiate a random access process in the target cell to obtain TA:
  • the terminal compares whether the difference between the RSRP when sending the first reference signal and the RSRP when receiving L1 and/or L2 signaling is greater than a certain preconfigured threshold
  • the terminal needs to initiate a random access process to obtain a valid TA when switching to the target cell; otherwise, the terminal determines the valid TA according to the solution in Example 1-4.
  • Examples 1 to 5 can be used in inter-freq, intra-freq, synchronous or asynchronous scenarios.
  • at least two of Examples 1, 2 and 3 may be combined, and Example 5 may be arbitrarily combined with one or more of Examples 1-4.
  • the information processing method provided in the embodiment of this application is a method of obtaining TA in advance.
  • the method of obtaining TA in advance may include: the terminal initiates RACH to at least one candidate cell based on the candidate cell configuration, see Example 1.
  • the method of obtaining TA in advance may include the terminal initiating RACH to at least one candidate cell based on conditions, see Example 2.
  • the method of obtaining TA in advance may include the terminal initiating RACH to at least one candidate cell based on network instructions, see Example 3.
  • the method of obtaining the TA in advance may include the terminal determining the TA based on the UTC time broadcast by the system message, see Example 4.
  • the terminal can obtain the TA of the target cell in advance, thereby reducing the handover delay.
  • FIG. 6 is a schematic structural diagram of a communication device 600 according to an embodiment of the present application.
  • the communication device 600 includes a processor 610, and the processor 610 can call and run a computer program from the memory, so that the communication device 600 implements the method in the embodiment of the present application.
  • the communication device 600 may further include a memory 620.
  • the processor 610 can call and run the computer program from the memory 620, so that the communication device 600 implements the method in the embodiment of the present application.
  • the memory 620 may be a separate device independent of the processor 610 , or may be integrated into the processor 610 .
  • the communication device 600 may also include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices. Specifically, the communication device 600 may send information or data to, or receive data from, other devices. Information or data sent.
  • the transceiver 630 may include a transmitter and a receiver.
  • the transceiver 630 may further include an antenna, and the number of antennas may be one or more.
  • the communication device 600 can be a network device according to the embodiment of the present application, and the communication device 600 can implement the corresponding processes implemented by the network device in the various methods of the embodiment of the present application. For the sake of simplicity, in This will not be described again.
  • the communication device 600 can be a terminal device in the embodiment of the present application, and the communication device 600 can implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of simplicity, in This will not be described again.
  • FIG. 7 is a schematic structural diagram of a chip 700 according to an embodiment of the present application.
  • the chip 700 includes a processor 710, and the processor 710 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 700 may also include a memory 720 .
  • the processor 710 can call and run the computer program from the memory 720 to implement the method executed by the terminal device or the network device in the embodiment of the present application.
  • the memory 720 may be a separate device independent of the processor 710 , or may be integrated into the processor 710 .
  • the chip 700 may also include an input interface 730 .
  • the processor 710 can control the input interface 730 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.
  • the chip 700 may also include an output interface 740.
  • the processor 710 can control the output interface 740 to communicate with other devices or chips. Specifically, it can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, this chip is not mentioned here. Again.
  • the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding processes implemented by the terminal device in the various methods of the embodiment of the present application. For the sake of brevity, this is not mentioned here. Again.
  • the chips used in network equipment and terminal equipment can be the same chip or different chips.
  • 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.
  • the processor mentioned above can be a general-purpose processor, a digital signal processor (DSP), an off-the-shelf programmable gate array (FPGA), an application specific integrated circuit (ASIC), or Other programmable logic devices, transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processor
  • FPGA off-the-shelf programmable gate array
  • ASIC application specific integrated circuit
  • the above-mentioned general processor may be a microprocessor or any conventional processor.
  • non-volatile memory may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically removable memory. Erase electrically programmable read-only memory (EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (RAM).
  • the memory in the embodiment of the present application can also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM) and so on. That is, memories in embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.
  • FIG. 8 is a schematic block diagram of a communication system 800 according to an embodiment of the present application.
  • the communication system 800 includes: a terminal device 810, configured to receive configuration information of a candidate cell; and determine a time advance TA based on the configuration information of the candidate cell.
  • the terminal device 810 can be used to implement the corresponding functions implemented by the terminal device in the above method. For the sake of brevity, they will not be described again here.
  • the communication system may further include a first network device 820 configured to send the configuration information of the candidate cell to the terminal device 810.
  • the network device 820 may be used to implement the corresponding functions implemented by the source cell in the above method, which will not be described again for the sake of simplicity.
  • the communication system may further include a second network device 830, configured to receive the first reference signal sent by the terminal device 810.
  • the network device 830 may be used to implement the corresponding functions implemented by the candidate cells in the above method, which will not be described again for the sake of brevity.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted over a wired connection from a website, computer, server, or data center (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center.
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), etc.
  • the size of the sequence numbers of the above-mentioned processes does not mean the order of execution.
  • the execution order of each process should be determined by its functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.

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Abstract

本申请涉及一种信息处理方法和终端设备。其中，该信息处理方法，包括：终端设备接收候选小区的配置信息；该终端设备基于该候选小区的配置信息确定时间提前量TA。本申请实施例基于候选小区的配置信息确定TA，可以减少切换的时延。

Description

信息处理方法和终端设备 技术领域
本申请涉及通信领域，更具体地，涉及一种信息处理方法和终端设备。
背景技术
新无线(New Radio，NR)系统支持连接态用户设备(User Equipment，UE)的切换过程。例如基于层一(L1)或者层二(L1)信令的进行切换。如果UE和目标小区不同步，UE收到切换命令之后仍需通过随机接入来获取目标小区的时间提前量(Timing Advance，TA)，可能会增加切换的时延。
发明内容
本申请实施例提供一种信息处理方法和终端设备，可以减少切换的时延。
本申请实施例提供一种信息处理方法，包括：
终端设备接收候选小区的配置信息；
该终端设备基于该候选小区的配置信息确定时间提前量TA。
本申请实施例提供一种终端设备，包括：
接收单元，用于接收候选小区的配置信息；
确定单元，用于基于该候选小区的配置信息确定时间提前量TA。
本申请实施例提供一种终端设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，以使该终端设备执行上述的信息处理方法。
本申请实施例提供一种芯片，用于实现上述的信息处理方法。
具体地，该芯片包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有该芯片的设备执行上述的信息处理方法。
本申请实施例提供一种计算机可读存储介质，用于存储计算机程序，当该计算机程序被设备运行时使得该设备执行上述的信息处理方法。
本申请实施例提供一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行上述的信息处理方法。
本申请实施例提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述的信息处理方法。
本申请实施例基于候选小区的配置信息确定TA，可以减少切换的时延。
附图说明
图1是根据本申请实施例的应用场景的示意图。
图2是基于Xn接口的切换过程的示意图。
图3是根据本申请一实施例的信息处理方法的示意性流程图。
图4是根据本申请一实施例的终端设备的示意性框图。
图5是根据本申请一实施例的终端设备的示意性框图。
图6是根据本申请实施例的通信设备示意性框图。
图7是根据本申请实施例的芯片的示意性框图。
图8是根据本申请实施例的通信系统的示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、新无线(New Radio，NR)系统、NR系统的演进系统、非授权频谱上的LTE(LTE-based access to unlicensed spectrum，LTE-U)系统、非授权频谱上的NR(NR-based access to unlicensed spectrum，NR-U)系统、非地面通信网络(Non-Terrestrial Networks，NTN)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、无线局域网(Wireless Local Area Networks，WLAN)、无线保真(Wireless Fidelity，WiFi)、第五代通信(5th-Generation，5G)系统或其他通信系统等。
通常来说，传统的通信系统支持的连接数有限，也易于实现，然而，随着通信技术的发展，移动通信系统将不仅支持传统的通信，还将支持例如，设备到设备(Device to Device，D2D)通信，机器到机器(Machine to Machine，M2M)通信，机器类型通信(Machine Type Communication，MTC)，车辆间(Vehicle to Vehicle，V2V)通信，或车联网(Vehicle to everything，V2X)通信等，本申请实施例也可以应用于这些通信系统。
在一种可能的实现方式中，本申请实施例中的通信系统可以应用于载波聚合(Carrier Aggregation，CA)场景，也可以应用于双连接(Dual Connectivity，DC)场景，还可以应用于独立(Standalone，SA)布网场景。
在一种可能的实现方式中，本申请实施例中的通信系统可以应用于非授权频谱，其中，非授权频谱也可以认为是共享频谱；或者，本申请实施例中的通信系统也可以应用于授权频谱，其中，授权频谱也可以认为是非共享频谱。
本申请实施例结合网络设备和终端设备描述了各个实施例，其中，终端设备也可以称为用户设备(User Equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。
终端设备可以是WLAN中的站点(STAION，ST)，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备、下一代通信系统例如NR网络中的终端设备，或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的终端设备等。
在本申请实施例中，终端设备可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。
在本申请实施例中，终端设备可以是手机(Mobile Phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(Virtual Reality，VR)终端设备、增强现实(Augmented Reality，AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self driving)中的无线终端设备、远程医疗(remote medical)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端设备、智慧城市(smart city)中的无线终端设备或智慧家庭(smart home)中的无线终端设备等。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
在本申请实施例中，网络设备可以是用于与移动设备通信的设备，网络设备可以是WLAN中的接入点(Access Point，AP)，GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及NR网络中的网络设备(gNB)或者未来演进的PLMN网络中的网络设备或者NTN网络中的网络设备等。
作为示例而非限定，在本申请实施例中，网络设备可以具有移动特性，例如网络设备可以为移动的设备。可选地，网络设备可以为卫星、气球站。例如，卫星可以为低地球轨道(low earth orbit，LEO)卫星、中地球轨道(medium earth orbit，MEO)卫星、地球同步轨道(geostationary earth orbit，GEO)卫星、高椭圆轨道(High Elliptical Orbit，HEO)卫星等。可选地，网络设备还可以为设置在陆地、水域等位置的基站。
在本申请实施例中，网络设备可以为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(Small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
图1示例性地示出了一种通信系统100。该通信系统包括一个网络设备110和两个终端设备120。在一种可能的实现方式中，该通信系统100可以包括多个网络设备110，并且每个网络设备110的覆盖范围内可以包括其它数量的终端设备120，本申请实施例对此不做限定。
在一种可能的实现方式中，该通信系统100还可以包括移动性管理实体(Mobility Management Entity，MME)、接入与移动性管理功能(Access and Mobility Management Function，AMF)等其他网络实体，本申请实施例对此不作限定。
其中，网络设备又可以包括接入网设备和核心网设备。即无线通信系统还包括用于与接入网设备进行通信的多个核心网。接入网设备可以是长期演进(long-term evolution，LTE)系统、下一代(移动通信系统)(next radio，NR)系统或者授权辅助接入长期演进(authorized auxiliary access long-term evolution，LAA-LTE)系统中的演进型基站(evolutional node B，简称可以为eNB或e-NodeB)宏基站、微基站(也称为“小基站”)、微微基站、接入站点(access point，AP)、传输站点(transmission point，TP)或新一代基站(new generation Node B，gNodeB)等。
应理解，本申请实施例中网络/系统中具有通信功能的设备可称为通信设备。以图1示出的通信系统为例，通信设备可包括具有通信功能的网络设备和终端设备，网络设备和终端设备可以为本申请实施例中的具体设备，此处不再赘述；通信设备还可包括通信系统中的其他设备，例如网络控制器、移动管理实体等其他网络实体，本申请实施例中对此不做限定。
应理解，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
应理解，在本申请的实施例中提到的“指示”可以是直接指示，也可以是间接指示，还可以是表示具有关联关系。举例说明，A指示B，可以表示A直接指示B，例如B可以通过A获取；也可以表示A间接指示B，例如A指示C，B可以通过C获取；还可以表示A和B之间具有关联关系。
在本申请实施例的描述中，术语“对应”可表示两者之间具有直接对应或间接对应的关系，也可以表示两者之间具有关联关系，也可以是指示与被指示、配置与被配置等关系。
为便于理解本申请实施例的技术方案，以下对本申请实施例的相关技术进行说明，以下相关技术作为可选方案与本申请实施例的技术方案可以进行任意结合，其均属于本申请实施例的保护范围。
1.切换
与LTE系统相似，NR系统支持连接态UE的切换过程(也可以称为切换流程)。当正在使用网络服务的用户从一个小区移动到另一个小区，或由于无线传输业务负荷量调整、激活操作维护、设备故障等原因，为了保证通信的连续性和服务的质量，系统要将该用户与源小区的通信链路转移到新的小区上，即执行切换过程。
参见图2，以Xn接口切换过程为例，该切换过程可以包括以下阶段：
(1)切换准备(Handover Preparation)，包括测量控制和测量上报，切换请求以及确认等。在切换确认消息中包括目标小区生成的切换命令。源小区不允许对目标小区生成的切换命令进行任何修改，直接将切换命令转发给UE。以源小区为源gNB，目标小区为目标gNB为例，切换准备具体可以包括：
步骤0：AMF提供移动性控制信息(Mobility control information provided by AMF)。例如，源gNB中的UE上下文包括关于漫游和访问限制的信息，这些信息在连接建立时提供的，或者在上次TA更新时提供的。(The UE context within the source gNB contains information regarding roaming and access restrictions which were provided either at connection establishment or at the last TA update.)
步骤1.测量控制和测量上报(Measurement Control and Reports)。例如，源gNB根据测量配置配置UE的测量过程和UE上报。(The source gNB configures the UE measurement procedures and the UE reports according to the measurement configuration..)
步骤2.切换决定(Handover Decision)。例如，源gNB基于测量报告和无线资源管理(Radio Resource Management，RRM)信息决定切换UE。(The source gNB decides to handover the UE,based on MeasurementReport and RRM information.)
步骤3.切换请求(HANDOVER REQUEST)。源gNB通过透明无线资源控制(Radio resource control，RRC)容器向目标gNB发出切换请求消息，用于传递切换准备的必要信息。准备在目标侧进行切换。(The source gNB issues a Handover Request message to the target gNB passing a transparent RRC container with necessary information to prepare the handover at the target side.)
步骤4.准入控制(Admission Control)。例如，准入控制可以由目标gNB执行。(Admission Control may be performed by the target gNB.)
步骤5.切换请求确认(HANDOVER REQUEST ACKNOWLEDGE)。例如，目标gNB与L1/L2进行切换准备工作，并向源gNB发送切换请求确认消息。该切换请求确认消息中包括作为RRC消息被发送到UE进行切换的透明容器。目标gNB还可以在切换请求确认消息中指示是否接受双激活协议栈(Dual Active Protocol Stack，DAPS)切换。(The target gNB prepares the handover with L1/L2 and sends the  HANDOVER REQUEST ACKNOWLEDGE to the source gNB,which includes a transparent container to be sent to the UE as an RRC message to perform the handover.The target gNB also indicates if a DAPS handover is accepted.)
(2)切换执行(Handover Execution)，包括：UE在收到切换命令后立即执行切换过程，即UE断开源小区并与目标小区连接，例如执行随机接入，发送RRC切换完成消息给目标基站等；序列号(Serial Number，SN)状态转移；数据转发。以源小区为源gNB，目标小区为目标gNB为例，切换执行具体可以包括：
步骤6.无线接入网(Radio Access Network，RAN)切换初始化(RAN Handover Initiation)。例如，源gNB通过向UE发送包含访问目标小区所需的信息的RRC重配消息来触发Uu切换。(The source gNB triggers the Uu handover by sending an RRCReconfiguration message to the UE,containing the information required to access the target cell.)
步骤7a.早期状态转移(EARLY Status Transfer)。例如，数据无线承载(Data Radio Bearer，DRB)配置了DAPS，源gNB发送早期状态转移消息。(For DRBs configured with DAPS,the source gNB sends the EARLY STATUS TRANSFER message.)
步骤7.SN状态转移(SN STATUS TRANSFER)。DRB未配置DAPS，源gNB向目标gNB发送SN状态转移消息，以传输适用于PDCP状态保存的DRB的上行PDCP SN接收状态和下行PDCP SN发射状态传递给目标GNB。(For DRBs not configured with DAPS,the source gNB sends the SN STATUS TRANSFER message to the target gNB to convey the uplink PDCP SN receiver status and the downlink PDCP SN transmitter status of DRBs for which PDCP status preservation applies)
(3)切换完成(Handover Completion)：目标小区与AMF和用户面功能(User Plane Function，UPF)执行路径切换(Path Switch)，释放源基站的UE上下文。以源小区为源gNB，目标小区为目标gNB为例，切换完成具体可以包括：
步骤8.RAN切换完成(RAN Handover Completion)。UE与目标小区同步，并通过向目标gNB发送RRC重配完成消息来完成RRC切换过程。(The UE synchronises to the target cell and completes the RRC handover procedure by sending RRCReconfigurationComplete message to target gNB.)
步骤8a.切换成功(HANDOVER SUCCESS)。在DAPS切换的情况下，目标gNB向源gNB发送切换成功消息以通知：UE已成功访问目标小区。(In case of DAPS handover,the target gNB sends the HANDOVER SUCCESS message to the source gNB to inform that the UE has successfully accessed the target cell.)
步骤8b.SN状态转移(SN STATUS TRANSFER)。作为反馈，源gNB向使用配置DAPS的DRB发送SN状态转移消息，参见步骤7。(In return,the source gNB sends the SN STATUS TRANSFER message for DRBs configured with DAPS for which the description in step 7 applies)
步骤9.路径切换请求(Path Switch request)。目标gNB向AMF发送路径切换请求消息，以触发5GC(5G核心网)将DL数据路径切换到目标gNB，并建立指向目标gNB的NG-C接口实例。(The target gNB sends a PATH SWITCH REQUEST message to AMF to trigger 5GC to switch the DL data path towards the target gNB and to establish an NG-C interface instance towards the target gNB.)
步骤10.路径切换到UPF(Path Switch in UPF(s))。5GC将DL数据路径切换到目标gNB。UPF在每个PDU会话/隧道，在旧路径上向源gNB发送一个或多个“结束标记”包，然后能够释放指向源gNB的任何U-平面/TNL资源。(5GC switches the DL data path towards the target gNB.The UPF sends one or more"end marker"packets on the old path to the source gNB per PDU session/tunnel and then can release any U-plane/TNL resources towards the source gNB.)
步骤11.路径切换请求确认(Path Switch request Acknowledge)。AMF使用路径切换请求确认消息来确认路径切换请求消息。(The AMF confirms the PATH SWITCH REQUEST message with the PATH SWITCH REQUEST ACKNOWLEDGE message.)
步骤12.UE上下文释放(UE Context Release)。接收到来自AMF的路径切换请求确认消息后，目标gNB发送UE上下文发布，通知源gNB切换成功。然后源gNB可以释放与UE上下文关联的无线电和C-plane相关资源。任何正在进行的数据转发都可以继续。(Upon reception of the PATH SWITCH REQUEST ACKNOWLEDGE message from the AMF,the target gNB sends the UE CONTEXT RELEASE to inform the source gNB about the success of the handover.The source gNB can then release radio and C-plane related resources associated to the UE context.Any ongoing data forwarding may continue.)
2.L1和/或L2切换
为了减小切换带来的时延，NR R18支持基于L1和/或L2的切换，基于L1和/或L2的切换主要针对内部(intra)-集中式单元(Central Unit，CU)场景，在CU(PDCP/密钥)不变的情况下基于层一或 者层二信令的进行切换。
对于L1和/或L2的切换，若UE和目标小区是不同步的，UE仍需通过随机接入来获取目标小区的TA(时间提前量)，那么切换的时延会因为随机接入过程而大大增加。本申请实施例中，UE可以提前获取TA。
图3是根据本申请一实施例的信息处理方法300的示意性流程图。该方法可选地可以应用于图1所示的系统，但并不仅限于此。该方法包括以下内容的至少部分内容。
S310、终端设备接收候选小区的配置信息。
S320、该终端设备基于该候选小区的配置信息确定时间提前量(TA)。
在本申请实施例中，终端设备可以接收来自于网络设备例如源小区的无线资源控制(RRC)重配消息，该RRC重配消息中包括候选小区的配置信息。终端设备基于收到候选小区的配置信息，可以在切换之前确定该终端设备在所述候选小区所用的TA。候选小区的配置信息中可以包括一个或多个候选小区的配置信息。多个候选小区中可以包括一个或多个目标小区。
在一种实施方式中，该终端设备基于该候选小区的配置信息确定TA，包括：该终端设备基于该候选小区的配置信息，向至少一个该候选小区发送第一参考信号，该第一参考信号用于确定该TA。
例如，该候选小区的配置信息中可以包括一个候选小区的标识，终端设备可以向这一个候选小区发送第一参考信号。再如，该配置信息中可以包括N个候选小区的标识，N为大于等于1的正整数。终端设备可以向这N个候选小区发送第一参考信号，也可以向这N个候选小区中的部分候选小区发送第一参考信号。
在一种实施方式中，该终端设备基于该候选小区的配置信息，向至少一个该候选小区发送第一参考信号，包括：该终端设备在收到该候选小区的配置信息后经过第一时间段后，向至少一个该候选小区发送该第一参考信号。
在一种实施方式中，该第一时间段由第一定时器确定，该第一时间段的起点为该终端设备在收到该候选小区的配置信息时启动该第一定时器的时刻，该第一时间段的终点为该终端设备在该第一定时器超时时向至少一个该候选小区发送该第一参考信号的时刻。
例如，终端设备在收到候选小区的配置信息时，启动第一定时器。第一定时器的时长可以是预先设置的，也可以是网络配置的。如果第一定时器超时，终端设备向至少一个候选小区发送第一参考信号。
在一种实施方式中，每个该候选小区对应一个该第一定时器。例如，终端设备在收到候选小区的配置信息时，如果该配置信息中包括的多个候选小区的标识，可以启动多个第一定时器。例如，该配置信息中包括的N个候选小区的标识，可以启动N个或M个第一定时器。M为小于N的正整数。
在一种实施方式中，该第一定时器的时长与终端设备的运动轨迹以及该候选小区的覆盖范围相关。例如，对于特定运行轨迹的终端设备而言，网络设备可以在终端设备即将和/或刚刚抵达该小区的覆盖范围时触发第一参考信号的发送。
在一种实施方式中，该终端设备基于该候选小区的配置信息确定TA，包括：该终端设备基于该候选小区的配置信息和第一条件向至少一个候选小区发送第一参考信号，该第一参考信号用于确定该TA。
在一种实施方式中，该第一条件包括以下至少之一：
源小区的信号质量小于或等于第一阈值；
候选小区的信号质量大于或等于第二阈值。
在本申请实施例中，第一阈值可以为源小区阈值，第二阈值可以为候选小区阈值。终端设备可以基于源小区是否满足第一条件确定是否发送第一参考信号，也可以基于候选小区是否满足第一条件确定是否发送第一参考信号，还可以基于源小区和候选小区是否均满足第一条件确定是否发送第一参考信号。如果源小区的信号质量差例如源小区的信号质量小于或等于第一阈值，可以认为源小区满足第一条件。如果候选小区的信号质量好例如的候选小区信号质量大于或等于第二阈值，可以认为候选小区满足第一条件。
在一种实施方式中，该终端设备基于该候选小区的配置信息和第一条件向至少一个候选小区发送第一参考信号，包括以下至少之一：
该终端设备在源小区的信号质量小于或等于第一阈值的情况下，向所有候选小区发送该第一参考信号；
该终端设备在候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送该第一参考信号；
该终端设备在源小区的信号质量小于或等于第一阈值、且候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送该第一参考信号。
例如，如果源小区的信号质量小于或等于第一阈值，终端设备可能需要切换，终端设备可以向所有 的N个候选小区发送第一参考信号，提前获取TA，从而减少了切换过程中由于要获得TA执行随机接入流程而导致的切换时延。如果源小区的信号质量大于第一阈值，终端设备可能需要不切换，终端设备可以不向候选小区发送第一参考信号。这种情况下，也可以不比较候选小区的信号质量。
再如，如果N个候选小区中的M个候选小区的信号质量大于或等于第二阈值，可以向这M个候选小区中的一个或多个小区发送第一参考信号。
再如，如果源小区的信号质量小于或等于第一阈值，并且N个候选小区中的M个候选小区的信号质量大于或等于第二阈值，可以向这M个候选小区中的一个或多个小区发送第一参考信号。
在一种实施方式中，该方法还包括：该终端设备向网络设备上报满足该第一条件的候选小区的标识。
例如，有M个候选小区满足第一条件，终端设备可以将这M个候选小区的标识发送至网络设备。网络设备可以从这M个候选小区的标识中选择一个或多个指示给终端设备。终端设备向网络设备指示的这些标识对应的小区发送第一参考信号。
在一种实施方式中，该方法还包括：该终端设备接收该网络设备的第一指示，该第一指示用于指示是否向满足该第一条件的候选小区的发起随机接入过程，和/或，用于指示随机接入资源。
例如，第一指示中可以指示终端设备向满足第一条件的所有候选小区发起随机接入过程(也可以称为RACH、随机接入、随机接入流程等)，终端设备可以向满足条件的M个候选小区发送第一参考信号例如随机接入前导码。此外，第一指示中可以指示本次随机接入所用的随机接入资源。
再如，第一指示中可以指示终端设备向满足第一条件的M个候选小区中的部分候选小区例如小区C1和C2发起随机接入过程，终端设备可以向小区C1和C2发送随机接入前导码。
在一种实施方式中，该终端设备基于该候选小区的配置信息确定TA，包括：该终端设备基于该候选小区的配置信息和第二指示向第一候选小区发送第一参考信号，该第一参考信号用于确定该TA。
在一种实施方式中，该方法还包括：
该终端设备接收该第二指示，该第二指示通过MAC CE和/或DCI携带。
在本申请实施例中，第二指示和候选小区的配置信息可以同时发送，或者第二指示晚于候选小区的配置信息发送。相应地，终端设备可以同时接收第二指示和候选小区的配置信息，也可以是分别接收第二指示和候选小区的配置信息。例如，终端设备同时收到RRC和MAC CE，其中RRC携带候选小区的配置信息，MAC CE携带第二指示。再如，终端设备先后收到RRC和DCI，其中RRC携带候选小区的配置信息，DCI携带第二指示。
在一种实施方式中，该第二指示包括第一候选小区的标识和随机接入资源中的至少之一。
在本申请实施例中，第一定时器、第一条件和第二指示中的至少两者可以结合。
一种方式中，第一定时器和第一条件可以结合。例如，终端设备检测到第一定时器超时并且源小区满足第一条件，再向所有候选小区发送第一参考信号。再如，终端设备检测到第一定时器超时并且候选小区满足第一条件，再向满足第一条件的候选小区发送第一参考信号。再如，终端设备检测到第一定时器超时并且源小区和候选小区满足第一条件，再向满足第一条件的候选小区发送第一参考信号。再如，终端设备为每个候选小区分别启动了对应的第一定时器，如果某个候选小区的第一定时器超时并且该候选小区满足第一条件，再向该候选小区发送第一参考信号。如果某个候选小区的第一定时器超时但是该候选小区不满足第一条件，则不向该候选小区发送第一参考信号。
一种方式中，第一定时器和第二指示可以结合。例如，终端设备检测到第一定时器超时并且收到第二指示，再向至少一个候选小区发送第一参考信号。再如，终端设备为每个候选小区分别启动了对应的第一定时器，如果某个候选小区的第一定时器超时并且收到第二指示，再向该候选小区发送第一参考信号。如果某个候选小区的第一定时器超时但是并且收到第二指示，则不向该候选小区发送第一参考信号。
一种方式中，第二指示和第一条件可以结合。例如，终端设备收到第二指示并且源小区满足第一条件，再向第二指示所指示的所有候选小区发送第一参考信号。再如，终端设备收到第二指示并且第二指示所指示的候选小区满足第一条件，再向第二指示所指示的满足第一条件的候选小区发送第一参考信号。再如，终端设备收到第二指示并且源小区和第二指示所指示的候选小区满足第一条件，再向第二指示所指示的满足第一条件的候选小区发送第一参考信号。
一种方式中，第一定时器、第一条件和第二指示可以结合。例如，终端设备检测到第一定时器超时、源小区满足第一条件并且收到第二指示，再向第二指示所指示的所有候选小区发送第一参考信号。再如，终端设备检测到第一定时器超时、候选小区满足第一条件并且收到第二指示，再向第二指示所指示的满足第一条件的候选小区发送第一参考信号。再如，终端设备检测到第一定时器超时、源小区和候选小区满足第一条件并且收到第二指示，再向第二指示所指示的满足第一条件的候选小区发送第一参考信号。再如，终端设备为每个候选小区分别启动了对应的第一定时器，如果某个候选小区的第一定时器超时、该候选小区满足第一条件并且收到第二指示，再向该候选小区发送第一参考信号。如果某个候选小区的 第一定时器超时、但是该候选小区不满足第一条件或没有收到第二指示，则不向该候选小区发送第一参考信号。
在一种实施方式中，该方法还包括：该终端设备在发送该第一参考信号后监听随机接入响应(Random Access Response，RAR)窗口，以接收RAR，该RAR中包括TA、小区无线网络临时标识C-RNTI、上行链路授权UL GRANT的至少之一。
在本申请实施例中，可以采用基于竞争的随机接入过程和/或基于非竞争的随机接入过程。在终端设备向网络发送随机接入请求(其中可以包括随机接入前导码)后，可以监听RAR窗口，以接收RAR。RAR中可以不携带上行链路授权(UL GRANT)。
在一种实施方式中，该方法还包括：该终端设备在发送该第一参考信号后在RAR窗口内监听物理下行控制信道(PDCCH)，以接收RAR，该RAR中包括TA、C-RNTI、UL GRANT的至少之一，其中，该RAR中携带的UL GRANT用于在该终端设备向候选小区发送上行消息时使用。
在一种实施方式中，该方法还包括：终端设备在发送该第一参考信号后不期待接收RAR。由收到该第一参考信号的候选小区通过Xn接口将该TA发送给源小区，以使得源小区在发送切换命令时携带该TA。例如，候选小区C3收到终端设备的第一参考信号后，通过Xn接口将利用该第一参考信号确定的候选小区的TA发送给该终端设备的源小区。如果该候选小区是切换的目标小区，该源小区向该终端设备发送切换命令时携带该候选小区的TA。
在一种实施方式中，该候选小区的配置信息包括用于发送第一参考信号的资源配置信息。
在一种实施方式中，该第一参考信号包括随机接入前导码。
在一种实施方式中，该资源配置信息包括随机接入资源。
在一种实施方式中，该随机接入资源包括以下至少之一：波束标识；码域资源；时频域资源。
在一种实施方式中，该波束标识包括同步信号块(Synchronization Signal and PBCH block,SSB)索引、信道状态信息测量参考信号(Channel State Information-Reference Signal，CSI-RS)索引的至少之一。
在一种实施方式中，该码域资源包括前导码索引(preamble index)。
在一种实施方式中，该时频域资源包括随机接入机会(RACH occasion)。
在一种实施方式中，该随机接入资源用于隐式指示本次随机接入过程用于获取切换的TA。
在一种实施方式中，该随机接入资源是层一(L1)和/或层二(L2)移动性TA获取的特定的资源(L1/L2 mobility TA acquire specific)，该随机接入资源用于表示本次随机接入过程用于L1和/或L2切换的TA。例如，网络收到使用L1/L2 mobility TA acquire specific的随机接入资源发送的preamble后，就知道该随机接入过程是用于获取L1和/或L2切换的TA。
在一种实施方式中，该随机接入资源包括基于竞争的随机接入资源和/或基于非竞争的随机接入资源。
在一种实施方式中，该基于竞争的随机接入资源通过候选小区的系统消息SIB1携带。
在一种实施方式中，该基于非竞争的随机接入资源包括以下至少之一：
随机接入信道RACH资源；SSB索引；前导码索引。
在一种实施方式中，该第一参考信号包括信道探测参考信号(Sounding Reference Signal，SRS)。例如，终端设备向候选小区发送SRS后，候选小区将TA可以反馈给源小区，由源小区在向终端设备发送切换命令(HO command)中携带TA。
在一种实施方式中，该资源配置信息包括以下至少之一：资源标识(resource ID)、周期、带宽、时频资源、发送端口、路损参考信号、起始位置。
例如，终端设备接收到的候选小区的配置信息中的资源配置信息包括资源标识、周期、带宽、时频资源、发送端口、路损参考信号、起始位置的一个或多个，终端设备根据该资源配置信息可以向一个或多个候选小区发送SRS。
在一种实施方式中，该候选小区的配置信息包括候选小区的SIB1和/或SIB9的调度信息。
在一种实施方式中，该方法还包括：该终端设备基于该调度信息接收该候选小区的SIB9。在本申请实施例中，终端设备可以基于候选小区的配置信息自己计算得到TA。例如，终端设备可以基于候选小区的配置信息中的调度信息接收候选小区的系统信息例如SIB9，再根据系统信息中的时间信息例如传播时延计算TA。
在一种实施方式中，该方法还包括：该终端设备自身触发接收该候选小区的SIB9。在本申请实施例中，终端设备可以自身触发接收候选小区的系统信息例如SIB9，再根据系统信息中的时间信息例如传播时延计算TA。
在一种实施方式中，该方法还包括：该终端设备基于网络设备的第三指示确定是否接收该候选小区 的SIB9和/或需要接收SIB9的候选小区的标识。
在本申请实施例中，终端设备可以接收网络设备的第三指示。
该第三指示可以指示该终端设备是否接收该候选小区的SIB9。如果第三指示指示了该终端设备接收候选小区的SIB9，则该终端设备可以接收一个或多个候选小区的SIB9。如果第三指示指示了该终端设备不接收候选小区的SIB9，则该终端设备可以拒绝接收候选小区的SIB9。
该第三指示还可以具体指示该终端设备接收哪个或哪些候选小区的SIB9。如果第三指示指示了该终端设备接收候选小区C1和C2的SIB9，则该终端设备可以接收候选小区C1和C2的SIB9，而不接收其他小区的SIB9。
在一种实施方式中，该SIB9包括协调通用时间(Coordinated Universal Time，UTC)，该终端设备基于该候选小区的配置信息确定TA包括：该终端设备基于该SIB9中的UTC确定传播时延，并根据该传播时延确定TA。例如，基于SIB9中的UTC可以计算SIB9从网络设备到终端设备的传播时延。TA可以等于传播时延的两倍。传播时延的计算方法包括终端设备收到SIB9的时间减去SIB9中指示的UTC。
在一种实施方式中，该候选小区的配置信息中还包括测量间隙(Measurement Gap，MG)配置信息。在本申请实施例中，MG也可以是终端设备请求的。例如，网络预配置多套MG，终端设备可以通过MAC CE或者DCI指示需要使用哪一套MG。终端设备在需要接收候选小区系统消息或向候选小区发送随机接入/SRS时可以使用MG或者请求MG。
在一种实施方式中，该方法还包括：该终端设备上报该TA。例如，终端设备获取候选小区的TA后，可以向网络设备上报该候选小区的TA。
在本申请实施例中，候选小区中包括可以选择作为目标小区的小区。目标小区的数量可以是多个，也可以是一个。如果需要将终端设备从源小区切换到目标小区，终端设备可以自己选择目标小区，也可以由网络侧为终端设备选择目标小区。某些情况下，候选小区也可能全都不适合作为目标小区，需要从候选小区之外选择目标小区。
在一种实施方式中，该方法还包括：该终端设备在接收到切换命令的情况下，基于第二条件确定该终端设备获取的TA是否有效。
在本公开实施例中，如果终端设备在接收到切换命令之前已经获取了TA，收到切换命令的情况下，可以基于第二条件确定终端设备采用上述任意一种方式获取的TA(例如发送第一参考信号或基于SIB9中的UTC计算得到的TA)是否有效。如果终端设备获取的有效，可以在切换中使用；否则，可以重新获取TA。
在一种实施方式中，该基于第二条件确定该终端设备获取的TA是否有效，包括以下至少之一：
在满足该第二条件下，该终端设备获取的TA有效；
在不满足该第二条件下，该终端设备获取的TA无效，该终端设备发起随机接入过程，重新获取TA。
在一种实施方式中，该第二条件包括以下至少之一：
第二定时器是否处于运行状态；
第一参考信号发送时的RSRP与接收到L1和/或L2信令时的RSRP差值是否大于第三阈值。
例如，第二定时器处于运行状态，则满足第二条件。第二定时器未启动、暂停或超时则不满足第二条件。再如，第一参考信号发送时的RSRP1与接收到L1和/或L2信令时的RSRP2差值大于第三阈值，则满足第二条件。RSRP1与RSRP2的差值小于或等于第三阈值，则不满足第二条件。再如，第二定时器处于运行状态，并且，RSRP1与RSRP2的差值大于第三阈值，则满足第二条件。
在一种实施方式中，该第二定时器在该终端设备发送该第一参考信号后启动。例如，终端设备发送第一参考信号后启动第二定时器，在第二定时器运行期间，如果终端设备接收到切换命令，则该终端设备采用上述任意一种方式获取的TA有效。如果第二定时器超时后，终端设备才接收到切换命令，则该终端设备采用上述任意一种方式获取的TA无效，需要重新获取TA。
在一种实施方式中，该切换命令是L1信令和/或L2信令。
在一种实施方式中，该切换命令通过MAC CE和/或DCI携带。
在一种实施方式中，该切换命令包括以下至少之一：
目标小区标识；
该TA；
小区无线网络临时标识(C-RNTI)；
终端设备专用信道和/或公共信道的传输配置指示(Transmission Configuration Indication，TCI)状态(state)；
辅小区SCELL激活和/或去激活信息以及相应的TCI状态。
在一种实施方式中，如果终端设备收到的切换命令中包括TA，终端设备在切换时可以基于切换命 令中的TA进行切换。
在一种实施方式中，该公共信道包括公共PDCCH和/或公共PDSCH；
该终端设备专用信道的TCI状态包括以下至少之一：该终端设备专用的PDCCH的TCI状态、该终端设备专用的PDSCH的TCI状态、所有PUSCH的TCI状态、所有PUCCH的TCI状态。
在一种实施方式中，该候选小区的配置信息还包括以下至少之一：
候选小区标识；
新的C-RNTI；
所选安全算法的候选小区安全算法信息；
专用的随机接入资源；
随机接入资源和同步信号块SSB之间的关联；
随机接入资源和终端设备特定的CSI-RS配置之间的关联；
公共的随机接入资源；
候选小区的系统信息。
在一种实施方式中，该TA包括该终端设备的目标小区的TA。
本申请实施例的信息处理方法，终端设备能够提前获取候选小区的TA，进而可以在收到切换命令时或收到切换命令之前获取目标小区的TA，实现终端设备与目标小区的同步，减少切换时延。
图4是根据本申请一实施例的终端设备400的示意性框图。该终端设备400可以包括：
接收单元410，用于接收候选小区的配置信息；
确定单元420，用于基于该候选小区的配置信息确定时间提前量TA。
在一种实施方式中，如图5所示，在终端设备500中，该确定单元420，包括：
第一发送子单元510，用于基于该候选小区的配置信息，向至少一个该候选小区发送第一参考信号，该第一参考信号用于确定该TA。
在一种实施方式中，该第一发送子单元510用于在收到该候选小区的配置信息后经过第一时间段后，向至少一个该候选小区发送该第一参考信号。
在一种实施方式中，该第一时间段由第一定时器确定，该第一时间段的起点为该终端设备在收到该候选小区的配置信息时启动该第一定时器的时刻，该第一时间段的终点为该终端设备在该第一定时器超时时向至少一个该候选小区发送该第一参考信号的时刻。
在一种实施方式中，每个该候选小区对应一个该第一定时器，该第一定时器的时长与终端设备的运动轨迹以及该候选小区的覆盖范围相关。
在一种实施方式中，该确定单元420，包括：
第二发送子单元520，用于基于该候选小区的配置信息和第一条件向至少一个候选小区发送第一参考信号，该第一参考信号用于确定该TA。
在一种实施方式中，该第一条件包括以下至少之一：
源小区的信号质量小于或等于第一阈值；
候选小区的信号质量大于或等于第二阈值。
在一种实施方式中，该第二发送子单元520用于执行以下至少之一：
在源小区的信号质量小于或等于第一阈值的情况下，向所有候选小区发送该第一参考信号；
在候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送该第一参考信号；
在源小区的信号质量小于或等于第一阈值、且候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送该第一参考信号。
在一种实施方式中，该设备还包括：
第一上报单元430，用于向网络设备上报满足该第一条件的候选小区的标识。
在一种实施方式中，该接收单元410，还用于接收该网络设备的第一指示，该第一指示用于指示是否向满足该第一条件的候选小区的发起随机接入过程，和/或，用于指示随机接入资源。
在一种实施方式中，该确定单元420，包括：
第三发送子单元530，用于基于该候选小区的配置信息和第二指示向第一候选小区发送第一参考信号，该第一参考信号用于确定该TA。
在一种实施方式中，该接收单元410还用于接收该第二指示，该第二指示通过MAC CE和/或DCI携带。
在一种实施方式中，该第二指示包括第一候选小区的标识和随机接入资源中的至少之一。
在一种实施方式中，该设备还包括：
第一监听单元440，用于在发送该第一参考信号后监听RAR窗口，以接收RAR，该RAR中包括TA、小区无线网络临时标识C-RNTI、上行链路授权UL GRANT的至少之一。
在一种实施方式中，该设备还包括：
第二监听单元450，用于在发送该第一参考信号后在RAR窗口内监听物理下行控制信道PDCCH，以接收RAR，该RAR中包括TA、C-RNTI、UL GRANT的至少之一，其中，该RAR中携带的UL GRANT用于在该终端设备向候选小区发送上行消息时使用。
在一种实施方式中，该候选小区的配置信息包括用于发送第一参考信号的资源配置信息。
在一种实施方式中，该第一参考信号包括随机接入前导码。
在一种实施方式中，该资源配置信息包括随机接入资源。
在一种实施方式中，该随机接入资源包括以下至少之一：波束标识；码域资源；时频域资源。
在一种实施方式中，该波束标识包括同步信号块SSB索引、信道状态信息测量参考信号CSI-RS索引的至少之一。
在一种实施方式中，该码域资源包括前导码索引。
在一种实施方式中，该时频域资源包括随机接入机会。
在一种实施方式中，该随机接入资源用于隐式指示本次随机接入过程用于获取切换的TA。
在一种实施方式中，该随机接入资源是L1和/或L2移动性TA获取的特定的资源，该随机接入资源用于表示本次随机接入过程用于L1和/或L2切换的TA。
在一种实施方式中，该随机接入资源包括基于竞争的随机接入资源和/或基于非竞争的随机接入资源。
在一种实施方式中，该基于竞争的随机接入资源通过候选小区的系统消息SIB1携带。
在一种实施方式中，该基于非竞争的随机接入资源包括以下至少之一：随机接入信道RACH资源；SSB索引；前导码索引。
在一种实施方式中，该第一参考信号包括信道探测参考信号SRS。
在一种实施方式中，该资源配置信息包括以下至少之一：资源标识、周期、带宽、时频资源、发送端口、路损参考信号、起始位置。
在一种实施方式中，该候选小区的配置信息包括候选小区的SIB1和/或SIB9的调度信息。
在一种实施方式中，该接收单元410还用于基于该调度信息接收该候选小区的SIB9。
在一种实施方式中，该接收单元410还用于自身触发接收该候选小区的SIB9。
在一种实施方式中，该确定单元420还用于基于网络设备的第三指示确定是否接收该候选小区的SIB9和/或需要接收SIB9的候选小区的标识。
在一种实施方式中，该SIB9包括协调通用时间UTC，该确定单元420还用于基于该SIB9中的UTC确定传播时延，并根据该传播时延确定TA。
在一种实施方式中，该候选小区的配置信息中还包括测量间隙配置信息。
在一种实施方式中，该设备还包括：第二上报单元460，用于上报该TA。
在一种实施方式中，该确定单元420还用于在接收到切换命令的情况下，基于第二条件确定该终端设备获取的TA是否有效。
在一种实施方式中，该确定单元420还用于执行以下至少之一：
在满足该第二条件下，确定该终端设备获取的TA有效；
在不满足该第二条件下，确定该终端设备获取的TA无效，发起随机接入过程，重新获取TA。
在一种实施方式中，该第二条件包括以下至少之一：
第二定时器是否处于运行状态；
第一参考信号发送时的RSRP与接收到L1和/或L2信令时的RSRP差值是否大于第三阈值。
在一种实施方式中，该第二定时器在该终端设备发送该第一参考信号后启动。
在一种实施方式中，该切换命令是L1信令和/或L2信令。
在一种实施方式中，该切换命令通过MAC CE和/或DCI携带。
在一种实施方式中，该切换命令包括以下至少之一：
目标小区标识；
该TA；
小区无线网络临时标识C-RNTI；
终端设备专用信道和/或公共信道的TCI状态；
辅小区SCELL激活和/或去激活信息以及相应的TCI状态。
在一种实施方式中，该公共信道包括公共PDCCH和/或公共PDSCH；
该终端设备专用信道的TCI状态包括以下至少之一：该终端设备专用的PDCCH的TCI状态、该终端设备专用的PDSCH的TCI状态、所有PUSCH的TCI状态、所有PUCCH的TCI状态。
在一种实施方式中，该候选小区的配置信息还包括以下至少之一：
候选小区标识；
新的C-RNTI；
所选安全算法的候选小区安全算法信息；
专用的随机接入资源；
随机接入资源和同步信号块SSB之间的关联；
随机接入资源和终端设备特定的CSI-RS配置之间的关联；
公共的随机接入资源；
候选小区的系统信息。
在一种实施方式中，该TA包括该终端设备的目标小区的TA。
本申请实施例的终端设备400、500能够实现前述的方法300实施例中的终端设备的对应功能。该终端设备400、500中的各个模块(子模块、单元或组件等)对应的流程、功能、实现方式以及有益效果，可参见上述方法实施例中的对应描述，在此不再赘述。需要说明，关于申请实施例的终端设备400、500中的各个模块(子模块、单元或组件等)所描述的功能，可以由不同的模块(子模块、单元或组件等)实现，也可以由同一个模块(子模块、单元或组件等)实现。
示例1向RRC重配消息中的所有候选小区发送前导码(preamble)
终端接收网络配置的候选小区，该候选小区配置包括以下至少之一：候选小区标识，新的C-RNTI，所选安全算法的候选小区安全算法信息，专用的随机接入资源，随机接入资源和同步信号块SSB之间的关联，随机接入资源和终端设备特定的CSI-RS配置之间的关联，公共的随机接入资源，候选小区的系统信息(candidate cell ID,the new C-RNTI,the candidate gNB security algorithm identifiers for the selected security algorithms.It can also include a set of dedicated RACH resources,the association between RACH resources and SSB(s),the association between RACH resources and UE-specific CSI-RS configuration(s),common RACH resources,and system information of the candidate cell,etc.)
终端向至少一个候选小区发送第一参考信号(例如前导码或SRS)，该第一参考信号用于确定该终端的TA。该至少一个候选小区可以是网络配置的所有或部分候选小区。例如，终端收到网络侧的候选小区配置后向该配置中的所有候选小区发送第一参考信号。
可选的，可以是终端收到网络侧的候选小区配置后在第一时间段(第一定时器超时)后再向所有候选小区发送第一参考信号。比如终端收到网络侧的配置信息(配置候选小区的信息)后启动第一定时器，当该第一定时器超时，终端对该所有候选小区发送第一参考信号。该定时器的配置粒度还可以是每个(per)候选小区。也就是说每个候选小区可以维护相应的第一定时器。对于特定运行轨迹的终端而言，网络可以在终端即将/刚刚抵达该小区的覆盖范围时触发第一参考信号的发送。也就是说第一定时器的时长和终端的运动轨迹以及候选小区覆盖相关。
进一步的，终端可以通过随机接入过程向至少一个候选小区发送第一参考信号，也就是说第一参考信号可以是随机接入前导码。该随机接入过程可以是基于竞争的随机接入或者非竞争的随机接入。该随机接入过程的类型可以包括二步(2-step)或四步(4-step)随机接入。该随机接入的使用的随机接入资源可以是L1和/或L2移动性TA获取的特定的(L1/L2 mobility TA acquire specific)，这样网络收到终端发送的前导码(preamble)后就知道该随机接入过程是用于获取L1和/或L2切换的TA。
该配置信息中还包括用于发送第一参考信号的资源配置信息。如果第一参考信号为前导码，该资源配置信息可以为随机接入资源，例如包括波束标识(SSB/CSI-RS index)、码域资源(preamble index)、时频域资源(RACH occasion)中的至少之一。
该随机接入过程使用的相关配置和资源可以通过以下方式确定：
方式1(Option1)：网络在配置候选小区的时候携带该配置，也就是说候选小区配置信息里包括随机接入相关配置，可以是竞争的随机接入资源比如该候选小区的SIB1；还可以是基于非竞争的随机接入资源，网络可以在候选小区配置中携带RACH资源、SSB索引(index)、前导码索引(preamble index)等。
方式2(Option 2)：终端确定了满足条件的候选小区后上报网络侧，进而网络指示终端是否向该小区发起随机接入过程和/或随机接入资源。
若该随机接入过程为非竞争随机接入，终端可以执行以下至少之一：
方式1(Option1)：终端在发送完第一参考信号后不期待接收到该候选小区发送的RAR，也就是说该候选小区收到终端发送的第一参考信号后可以将获得的TA通过Xn接口发送给源小区用于源小区发 送切换命令时携带TA。
方式2(Option 2)：终端在发送完第一参考信号后正常监听RAR窗口(window)，用于接收RAR，该RAR可以不携带UL授权(Grant)。
方式3(Option3)：终端在发送完第一参考信号后正常在RAR window内监听PDCCH，用于接收RAR；该RAR里携带的UL grant可以用于后续UE向目标网络发送上行消息时使用。
此外，如果第一参考信号为SRS，第一参考信号的资源配置信息包括资源标识、周期、带宽、时频资源、发送端口、路损参考信号、起始位置等的一个或多个。
进一步的，终端接收网络发送的切换命令并执行小区切换，该切换命令可以是L1和/或L2信令，比如MAC CE或者DCI。该切换命令可以包括目标小区的标识、TA(若UE自己计算获得也可以不携带)、C-RNTI、公共信道(common PDCCH/PDSCH)和/或UE专属信道(UE-dedicated PDCCH/PDSCH and all PUSCH/PUCCH)的TCI状态(state)、SCELL激活去激活信息以及相应的TCI state等。该切换过程也适用于下述的示例2至示例5。
示例2基于条件(condition-based)
终端接收网络发送的候选小区配置，以及网络配置的第一条件信息，该第一条件包括源小区阈值和/或候选小区阈值；终端基于第一条件向候选小区发送第一参考信号(例如preamble)，包括：
当候选小区满足网络配置的第一条件时，终端向该小区发送第一参考信号。也就是说终端监测网络配置的所有候选小区信号强度，当满足候选小区阈值时(例如该候选小区的信号质量大于等于该候选小区阈值)，终端向满足条件的候选小区发送第一参考信号。
当源小区满足网络配置的第一条件时，终端向候选小区发送第一参考信号。也就是说终端监测源小区信号强度，当满足源小区阈值时(例如该源小区的信号质量小于等于该源小区阈值)，终端向所有候选小区发送第一参考信号。
当源小区和候选小区同时满足网络配置的第一条件时，终端向候选小区(例如信号质量大于等于该候选小区阈值的候选小区)发送第一参考信号。
可选的，终端向该候选小区发送第一参考信号之前，终端还可以指示网络侧该终端要发送第一参考信号的候选小区的信息。
该第一条件可以包括小区信道质量，例如，可以是RSRP、RSRQ、SINR等的至少之一。第一条件可以是相对条件或者绝对条件。例如，绝对条件可以包括小区信道质量与某个阈值的比较；相对条件可以包括小区信道质量的变化量与某个阈值的比较。
进一步的，终端向满足条件的候选小区发送的第一参考信号可以通过随机接入过程，也就是说第一参考信号可以是随机接入前导码。该随机接入过程可以是基于竞争的随机接入或者非竞争的随机接入。该随机接入过程的类型包括2-step或4-step随机接入,该随机接入的使用的随机接入资源可以是L1/L2 mobility TA acquire specific。这样网络收到终端发送的preamble后就知道该随机接入过程是用于获取L1和/或L2切换的TA。
该随机接入过程使用的相关配置和资源可以通过以下方式确定：
Option1：网络在配置候选小区的时候携带该配置，也就是说候选小区配置信息里包括随机接入相关配置，可以是竞争的随机接入资源比如该候选小区的SIB1；还可以是基于非竞争的随机接入资源，网络可以在候选小区配置中携带RACH资源、SSB索引(index)、前导码索引(preamble index)等。
Option2：终端确定了满足条件的候选小区后上报网络侧，进而网络指示终端是否向该小区发起随机接入过程和/或随机接入资源。
若该随机接入过程为非竞争随机接入，终端可以执行以下至少之一：
Option1：终端在发送完第一参考信号后不期待接收到该候选小区发送的RAR，也就是说该候选小区收到终端发送的第一参考信号后可以将获得的TA通过Xn接口发送给源小区用于源小区发送切换命令时携带TA。
Option 2：终端在发送完第一参考信号后正常监听RAR window，用于接收RAR，该RAR可以不携带UL Grant；
Option3：终端在发送完第一参考信号后正常在RAR window内监听PDCCH，用于接收RAR；该RAR里携带的UL grant可以用于后续UE向目标网络发送上行消息时使用。
示例3
终端接收网络发送的候选小区配置，以及网络发送的指示信息，该指示信息用于指示终端向候选小区发送第一参考信号。终端基于网络指示向候选小区发送第一参考信号。该指示信息可以和候选小区配置同时发送或者晚于候选小区的配置信息。该指示信息可以是MAC CE或DCI，包括了候选小区标识和/或RACH资源等。
终端向网络指示的候选小区发送的第一参考信号可以通过随机接入过程，也就是说第一参考信号可以是随机接入前导码，该随机接入过程可以是基于竞争的随机接入或者非竞争的随机接入，该随机接入过程的类型包括2-step或4-step RACH,该随机接入的使用的RACH资源可以是L1/L2 mobility TA acquire specific，这样网络收到终端发送的preamble后就知道该随机接入过程是用于获取L1和/或L2切换的TA。
示例4
终端接收候选小区配置信息，该配置信息里包括了该候选小区的SIB1和/或SIB9调度信息。终端基于该调度信息接收该候选小区的SIB9。可选的，该配置信息还可以包括测量间隙(Measurement gap)配置信息。
该SIB9包括UTC时间，终端基于该候选小区的系统消息广播的UTC时间确定传播时延进一步确定TA。
对于L1和/或L2 mobility(intra-CU场景)，可以认为终端和基站侧的UTC时间是已经同步的。
终端通过接收候选小区的SIB9确定传播时延(propagation delay，PD)，由于TA＝2*PD，进而根据PD可以确定TA。
UE接收该候选小区的SIB9可以是UE自己触发，比如结合示例1或者2，接收至少一个候选小区的SIB9。或者，终端可以基于网络指示确定是否接收该候选小区的SIB9，进一步基于网络指示确定接收哪个候选小区的SIB9。
可选的，终端确定TA后可以指示网络侧该TA的大小。
下面对SIB9进行介绍：
SIB9包含与GPS时间和协调通用时间(UTC)相关的信息。UE可以使用该系统信息块中提供的参数来获得UTC、GPS和本地时间(SIB9 contains information related to GPS time and Coordinated Universal Time(UTC).The UE may use the parameters provided in this system information block to obtain the UTC,the GPS and the local time.)。
注意：UE可以使用众多目的的时间信息，可能涉及上层，例如为了协助GPS初始化，为了同步UE时钟(NOTE:The UE may use the time information for numerous purposes,possibly involving upper layers e.g.to assist GPS initialisation,to synchronise the UE clock.)。参见以下SIB9的信息元素的示例，可以从SIB9的UTC时间信息字段例如timeInfoUTC中获取UTC。
一种SIB9信息元素(information element)的示例如下：
Figure PCTCN2022083192-appb-000001
此外，SIB9的部分字段描述的示例如下：
Figure PCTCN2022083192-appb-000002
示例5
基于上述示例1-4，为保证TA在终端发生L1和/或L2切换时的有效性，本方案进一步包括：
-终端在接收到L1和/或L2切换命令时，判断以下条件之一是否满足。若满足，则认为在目标小区下通过发送第一参考信号确定的TA有效。否则，需要通过重新向目标小区发起RACH以获取有效TA：
-终端在向各个目标小区发送第一参考信号后，启动第二定时器，第二定时器针对各个目标小区启动。在第二定时器运行期间内，若终端收到L1和/或L2信令，指示终端切换到对应的目标小区，则终端根据是否满足如下条件判断是否在目标小区下发起随机接入过程以获取TA：
-第二定时器是否处于运行；
-终端对比第一参考信号发送时的RSRP与接收到L1和/或L2信令时的RSRP差值是否大于某一预配置门限；
若上述条件至少之一不满足，则终端需要在切换到目标小区时发起随机接入过程以获取有效TA；否则，终端依照示例1-4中的方案确定有效TA。
上述示例1至5可以用于异频(Inter-freq)、同频(intra-freq)、同步或者异步场景。此外，示例1、示例2和示例3的至少两个可以结合，示例5可以和示例1-4中的一个或多个任意结合。
在本申请实施例中提供的信息处理方法是一种提前获得TA的方法。在一种实施方式中，该提前获得TA的方法可以包括：终端基于候选小区配置向至少一个候选小区发起RACH，参见示例1。在一种实施方式中，该提前获得TA的方法可以包括终端基于条件向至少一个候选小区发起RACH，参见示例2。在一种实施方式中，该提前获得TA的方法可以包括终端基于网络指示向至少一个候选小区发起RACH，参见示例3。在一种实施方式中，该提前获得TA的方法可以包括终端基于系统消息广播的UTC时间确定TA，参见示例4。
基于本申请实施例，终端可以提前获得目标小区的TA，从而减小了切换的时延。
图6是根据本申请实施例的通信设备600示意性结构图。该通信设备600包括处理器610，处理器610可以从存储器中调用并运行计算机程序，以使通信设备600实现本申请实施例中的方法。
在一种可能的实现方式中，通信设备600还可以包括存储器620。其中，处理器610可以从存储器620中调用并运行计算机程序，以使通信设备600实现本申请实施例中的方法。
其中，存储器620可以是独立于处理器610的一个单独的器件，也可以集成在处理器610中。
在一种可能的实现方式中，通信设备600还可以包括收发器630，处理器610可以控制该收发器630与其他设备进行通信，具体地，可以向其他设备发送信息或数据，或接收其他设备发送的信息或数据。
其中，收发器630可以包括发射机和接收机。收发器630还可以进一步包括天线，天线的数量可以为一个或多个。
在一种可能的实现方式中，该通信设备600可为本申请实施例的网络设备，并且该通信设备600可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
在一种可能的实现方式中，该通信设备600可为本申请实施例的终端设备，并且该通信设备600可以实现本申请实施例的各个方法中由终端设备实现的相应流程，为了简洁，在此不再赘述。
图7是根据本申请实施例的芯片700的示意性结构图。该芯片700包括处理器710，处理器710可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
在一种可能的实现方式中，芯片700还可以包括存储器720。其中，处理器710可以从存储器720中调用并运行计算机程序，以实现本申请实施例中由终端设备或者网络设备执行的方法。
其中，存储器720可以是独立于处理器710的一个单独的器件，也可以集成在处理器710中。
在一种可能的实现方式中，该芯片700还可以包括输入接口730。其中，处理器710可以控制该输入接口730与其他设备或芯片进行通信，具体地，可以获取其他设备或芯片发送的信息或数据。
在一种可能的实现方式中，该芯片700还可以包括输出接口740。其中，处理器710可以控制该输出接口740与其他设备或芯片进行通信，具体地，可以向其他设备或芯片输出信息或数据。
在一种可能的实现方式中，该芯片可应用于本申请实施例中的网络设备，并且该芯片可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
在一种可能的实现方式中，该芯片可应用于本申请实施例中的终端设备，并且该芯片可以实现本申请实施例的各个方法中由终端设备实现的相应流程，为了简洁，在此不再赘述。
应用于网络设备和终端设备的芯片可以是相同的芯片或不同的芯片。
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。
上述提及的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、现成可编程门阵列(field programmable gate array，FPGA)、专用集成电路(application specific integrated circuit，ASIC)或者其他可编程逻辑器件、晶体管逻辑器件、分立硬件组件等。其中，上述提到的通用处理器可以是微处理器或者也可以是任何常规的处理器等。
上述提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)。
应理解，上述存储器为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
图8是根据本申请实施例的通信系统800的示意性框图。该通信系统800包括：终端设备810，用于接收候选小区的配置信息；基于该候选小区的配置信息确定时间提前量TA。该终端设备810可以用于实现上述方法中由终端设备实现的相应的功能，为了简洁，在此不再赘述。
在一种实施方式中，该通信系统还可以包括第一网络设备820，用于向终端设备810发送候选小区的配置信息。网络设备820可以用于实现上述方法中由源小区实现的相应的功能，为了简洁，在此不再赘述。
在一种实施方式中，该通信系统还可以包括第二网络设备830，用于向接收终端设备810发送的第一参考信号。网络设备830可以用于实现上述方法中由候选小区实现的相应的功能，为了简洁，在此不再赘述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行该计算机程序指令时，全部或部分地产生按照本申请实施例中的流程或功能。该计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。该计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，该计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用 户线(Digital Subscriber Line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。该计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。该可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以该权利要求的保护范围为准。

Claims (93)

  1. 一种信息处理方法，包括：
    终端设备接收候选小区的配置信息；
    所述终端设备基于所述候选小区的配置信息确定时间提前量TA。
  2. 根据权利要求1所述的方法，其中，所述终端设备基于所述候选小区的配置信息确定TA，包括：
    所述终端设备基于所述候选小区的配置信息，向至少一个所述候选小区发送第一参考信号，所述第一参考信号用于确定所述TA。
  3. 根据权利要求2所述的方法，其中，所述终端设备基于所述候选小区的配置信息，向至少一个所述候选小区发送第一参考信号，包括：
    所述终端设备在收到所述候选小区的配置信息后经过第一时间段后，向至少一个所述候选小区发送所述第一参考信号。
  4. 根据权利要求3所述的方法，其中，所述第一时间段由第一定时器确定，所述第一时间段的起点为所述终端设备在收到所述候选小区的配置信息时启动所述第一定时器的时刻，所述第一时间段的终点为所述终端设备在所述第一定时器超时时向至少一个所述候选小区发送所述第一参考信号的时刻。
  5. 根据权利要求3或4所述的方法，其中，每个所述候选小区对应一个所述第一定时器，所述第一定时器的时长与终端设备的运动轨迹以及所述候选小区的覆盖范围相关。
  6. 根据权利要求1至5中任一项所述的方法，其中，所述终端设备基于所述候选小区的配置信息确定TA，包括：
    所述终端设备基于所述候选小区的配置信息和第一条件向至少一个候选小区发送第一参考信号，所述第一参考信号用于确定所述TA。
  7. 根据权利要求6所述的方法，其中，所述第一条件包括以下至少之一：
    源小区的信号质量小于或等于第一阈值；
    候选小区的信号质量大于或等于第二阈值。
  8. 根据权利要求7所述的方法，其中，所述终端设备基于所述候选小区的配置信息和第一条件向至少一个候选小区发送第一参考信号，包括以下至少之一：
    所述终端设备在源小区的信号质量小于或等于第一阈值的情况下，向所有候选小区发送所述第一参考信号；
    所述终端设备在候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送所述第一参考信号；
    所述终端设备在源小区的信号质量小于或等于第一阈值、且候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送所述第一参考信号。
  9. 根据权利要求6至8中任一项所述的方法，其中，所述方法还包括：
    所述终端设备向网络设备上报满足所述第一条件的候选小区的标识。
  10. 根据权利要求9所述的方法，其中，所述方法还包括：
    所述终端设备接收所述网络设备的第一指示，所述第一指示用于指示是否向满足所述第一条件的候选小区的发起随机接入过程，和/或，用于指示随机接入资源。
  11. 根据权利要求1至10中任一项所述的方法，其中，所述终端设备基于所述候选小区的配置信息确定TA，包括：
    所述终端设备基于所述候选小区的配置信息和第二指示向第一候选小区发送第一参考信号，所述第一参考信号用于确定所述TA。
  12. 根据权利要求11所述的方法，其中，所述方法还包括：
    所述终端设备接收所述第二指示，所述第二指示通过MAC CE和/或DCI携带。
  13. 根据权利要求11或12所述的方法，其中，所述第二指示包括第一候选小区的标识和随机接入资源中的至少之一。
  14. 根据权利要求2至13中任一项所述的方法，其中，所述方法还包括：
    所述终端设备在发送所述第一参考信号后监听随机接入响应RAR窗口，以接收RAR，所述RAR中包括TA、小区无线网络临时标识C-RNTI、上行链路授权UL GRANT的至少之一。
  15. 根据权利要求2至13中任一项所述的方法，其中，所述方法还包括：
    所述终端设备在发送所述第一参考信号后在RAR窗口内监听物理下行控制信道PDCCH，以接收RAR，所述RAR中包括TA、C-RNTI、UL GRANT的至少之一，其中，所述RAR中携带的UL GRANT用于在所述终端设备向候选小区发送上行消息时使用。
  16. 根据权利要求1至15中任一项所述的方法，其中，所述候选小区的配置信息包括用于发送第一参考信号的资源配置信息。
  17. 根据权利要求16所述的方法，其中，所述第一参考信号包括随机接入前导码。
  18. 根据权利要求17所述的方法，其中，所述资源配置信息包括随机接入资源。
  19. 根据权利要求16至18中任一项所述的方法，其中，所述随机接入资源包括以下至少之一：
    波束标识；
    码域资源；
    时频域资源。
  20. 根据权利要求19所述的方法，其中，
    所述波束标识包括同步信号块SSB索引、信道状态信息测量参考信号CSI-RS索引的至少之一；
    所述码域资源包括前导码索引；
    所述时频域资源包括随机接入机会。
  21. 根据权利要求18至20中任一项所述的方法，其中，所述随机接入资源用于隐式指示本次随机接入过程用于获取切换的TA。
  22. 根据权利要求21所述的方法，其中，所述随机接入资源是层一L1和/或层二L2移动性TA获取的特定的资源，所述随机接入资源用于表示本次随机接入过程用于L1和/或L2切换的TA。
  23. 根据权利要求18至22中任一项所述的方法，其中，所述随机接入资源包括基于竞争的随机接入资源和/或基于非竞争的随机接入资源。
  24. 根据权利要求23所述的方法，其中，所述基于竞争的随机接入资源通过候选小区的系统消息SIB1携带。
  25. 根据权利要求23所述的方法，其中，所述基于非竞争的随机接入资源包括以下至少之一：
    随机接入信道RACH资源；SSB索引；前导码索引。
  26. 根据权利要求16所述的方法，其中，所述第一参考信号包括信道探测参考信号SRS。
  27. 根据权利要求26所述的方法，其中，所述资源配置信息包括以下至少之一：
    资源标识、周期、带宽、时频资源、发送端口、路损参考信号、起始位置。
  28. 根据权利要求1所述的方法，其中，所述候选小区的配置信息包括候选小区的SIB1和/或SIB9的调度信息。
  29. 根据权利要求28所述的方法，其中，所述方法还包括：
    所述终端设备基于所述调度信息接收所述候选小区的SIB9。
  30. 根据权利要求28所述的方法，其中，所述方法还包括：
    所述终端设备自身触发接收所述候选小区的SIB9。
  31. 根据权利要求28至30中任一项所述的方法，其中，所述方法还包括：
    所述终端设备基于网络设备的第三指示确定是否接收所述候选小区的SIB9和/或需要接收SIB9的候选小区的标识。
  32. 根据权利要求28至31中任一项所述的方法，其中，所述SIB9包括协调通用时间UTC，所述终端设备基于所述候选小区的配置信息确定TA包括：
    所述终端设备基于所述SIB9中的UTC确定传播时延，并根据所述传播时延确定TA。
  33. 根据权利要求1至32中任一项所述的方法，其中，所述候选小区的配置信息中还包括测量间隙配置信息。
  34. 根据权利要求32或33所述的方法，其中，所述方法还包括：
    所述终端设备上报所述TA。
  35. 根据权利要求1至34中任一项所述的方法，其中，所述方法还包括：
    所述终端设备在接收到切换命令的情况下，基于第二条件确定所述终端设备获取的TA是否有效。
  36. 根据权利要求35所述的方法，其中，所述基于第二条件确定所述终端设备获取的TA是否有效，包括以下至少之一：
    在满足所述第二条件下，所述终端设备获取的TA有效；
    在不满足所述第二条件下，所述终端设备获取的TA无效，所述终端设备发起随机接入过程，重新获取TA。
  37. 根据权利要求35或36所述的方法，其中，所述第二条件包括以下至少之一：
    第二定时器是否处于运行状态；
    第一参考信号发送时的RSRP与接收到L1和/或L2信令时的RSRP差值是否大于第三阈值。
  38. 根据权利要求37所述的方法，其中，所述第二定时器在所述终端设备发送所述第一参考信号后 启动。
  39. 根据权利要求35至38中任一项所述的方法，其中，所述切换命令是L1信令和/或L2信令。
  40. 根据权利要求35至39中任一项所述的方法，其中，所述切换命令通过MAC CE和/或DCI携带。
  41. 根据权利要求35至40中任一项所述的方法，其中，所述切换命令包括以下至少之一：
    目标小区标识；
    所述TA；
    小区无线网络临时标识C-RNTI；
    终端设备专用信道和/或公共信道的传输配置指示TCI状态；
    辅小区SCELL激活和/或去激活信息以及相应的TCI状态。
  42. 根据权利要求41所述的方法，其中，所述公共信道包括公共PDCCH和/或公共PDSCH；
    所述终端设备专用信道的TCI状态包括以下至少之一：所述终端设备专用的PDCCH的TCI状态、所述终端设备专用的PDSCH的TCI状态、所有PUSCH的TCI状态、所有PUCCH的TCI状态。
  43. 根据权利要求1至42中任一项所述的方法，其中，所述候选小区的配置信息还包括以下至少之一：
    候选小区标识；
    新的C-RNTI；
    所选安全算法的候选小区安全算法信息；
    专用的随机接入资源；
    随机接入资源和同步信号块SSB之间的关联；
    随机接入资源和终端设备特定的CSI-RS配置之间的关联；
    公共的随机接入资源；
    候选小区的系统信息。
  44. 根据权利要求1至43中任一项所述的方法，其中，所述TA包括所述终端设备的目标小区的TA。
  45. 一种终端设备，包括：
    接收单元，用于接收候选小区的配置信息；
    确定单元，用于基于所述候选小区的配置信息确定时间提前量TA。
  46. 根据权利要求45所述的设备，其中，所述确定单元，包括：
    第一发送子单元，用于基于所述候选小区的配置信息，向至少一个所述候选小区发送第一参考信号，所述第一参考信号用于确定所述TA。
  47. 根据权利要求46所述的设备，其中，所述第一发送子单元用于在收到所述候选小区的配置信息后经过第一时间段后，向至少一个所述候选小区发送所述第一参考信号。
  48. 根据权利要求47所述的设备，其中，所述第一时间段由第一定时器确定，所述第一时间段的起点为所述终端设备在收到所述候选小区的配置信息时启动所述第一定时器的时刻，所述第一时间段的终点为所述终端设备在所述第一定时器超时时向至少一个所述候选小区发送所述第一参考信号的时刻。
  49. 根据权利要求47或48所述的设备，其中，每个所述候选小区对应一个所述第一定时器，所述第一定时器的时长与终端设备的运动轨迹以及所述候选小区的覆盖范围相关。
  50. 根据权利要求45至49中任一项所述的设备，其中，所述确定单元，包括：
    第二发送子单元，用于基于所述候选小区的配置信息和第一条件向至少一个候选小区发送第一参考信号，所述第一参考信号用于确定所述TA。
  51. 根据权利要求50所述的设备，其中，所述第一条件包括以下至少之一：
    源小区的信号质量小于或等于第一阈值；
    候选小区的信号质量大于或等于第二阈值。
  52. 根据权利要求51所述的设备，其中，所述第二发送子单元用于执行以下至少之一：
    在源小区的信号质量小于或等于第一阈值的情况下，向所有候选小区发送所述第一参考信号；
    在候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送所述第一参考信号；
    在源小区的信号质量小于或等于第一阈值、且候选小区的信号质量大于或等于第二阈值的情况下，向信号质量大于或等于第二阈值的候选小区发送所述第一参考信号。
  53. 根据权利要求50至52中任一项所述的设备，其中，所述设备还包括：
    第一上报单元，用于向网络设备上报满足所述第一条件的候选小区的标识。
  54. 根据权利要求53所述的设备，其中，所述接收单元，还用于接收所述网络设备的第一指示，所 述第一指示用于指示是否向满足所述第一条件的候选小区的发起随机接入过程，和/或，用于指示随机接入资源。
  55. 根据权利要求45至54中任一项所述的设备，其中，所述确定单元，包括：
    第三发送子单元，用于基于所述候选小区的配置信息和第二指示向第一候选小区发送第一参考信号，所述第一参考信号用于确定所述TA。
  56. 根据权利要求55所述的设备，其中，所述接收单元还用于接收所述第二指示，所述第二指示通过MAC CE和/或DCI携带。
  57. 根据权利要求55或56所述的设备，其中，所述第二指示包括第一候选小区的标识和随机接入资源中的至少之一。
  58. 根据权利要求46至57中任一项所述的设备，其中，所述设备还包括：
    第一监听单元，用于在发送所述第一参考信号后监听RAR窗口，以接收RAR，所述RAR中包括TA、小区无线网络临时标识C-RNTI、上行链路授权UL GRANT的至少之一。
  59. 根据权利要求46至57中任一项所述的设备，其中，所述设备还包括：
    第二监听单元，用于在发送所述第一参考信号后在RAR窗口内监听物理下行控制信道PDCCH，以接收RAR，所述RAR中包括TA、C-RNTI、UL GRANT的至少之一，其中，所述RAR中携带的UL GRANT用于在所述终端设备向候选小区发送上行消息时使用。
  60. 根据权利要求45至59中任一项所述的设备，其中，所述候选小区的配置信息包括用于发送第一参考信号的资源配置信息。
  61. 根据权利要求60所述的设备，其中，所述第一参考信号包括随机接入前导码。
  62. 根据权利要求61所述的设备，其中，所述资源配置信息包括随机接入资源。
  63. 根据权利要求60至62中任一项所述的设备，其中，所述随机接入资源包括以下至少之一：
    波束标识；
    码域资源；
    时频域资源。
  64. 根据权利要求63所述的设备，其中，
    所述波束标识包括同步信号块SSB索引、信道状态信息测量参考信号CSI-RS索引的至少之一；
    所述码域资源包括前导码索引；
    所述时频域资源包括随机接入机会。
  65. 根据权利要求62至64中任一项所述的设备，其中，所述随机接入资源用于隐式指示本次随机接入过程用于获取切换的TA。
  66. 根据权利要求65所述的设备，其中，所述随机接入资源是层一L1和/或层二L2移动性TA获取的特定的资源，所述随机接入资源用于表示本次随机接入过程用于L1和/或L2切换的TA。
  67. 根据权利要求62至66中任一项所述的设备，其中，所述随机接入资源包括基于竞争的随机接入资源和/或基于非竞争的随机接入资源。
  68. 根据权利要求67所述的设备，其中，所述基于竞争的随机接入资源通过候选小区的系统消息SIB1携带。
  69. 根据权利要求67所述的设备，其中，所述基于非竞争的随机接入资源包括以下至少之一：
    随机接入信道RACH资源；SSB索引；前导码索引。
  70. 根据权利要求60所述的设备，其中，所述第一参考信号包括信道探测参考信号SRS。
  71. 根据权利要求70所述的设备，其中，所述资源配置信息包括以下至少之一：
    资源标识、周期、带宽、时频资源、发送端口、路损参考信号、起始位置。
  72. 根据权利要求45所述的设备，其中，所述候选小区的配置信息包括候选小区的SIB1和/或SIB9的调度信息。
  73. 根据权利要求72所述的设备，其中，所述接收单元还用于基于所述调度信息接收所述候选小区的SIB9。
  74. 根据权利要求72所述的设备，其中，所述接收单元还用于自身触发接收所述候选小区的SIB9。
  75. 根据权利要求72至74中任一项所述的设备，其中，所述确定单元还用于基于网络设备的第三指示确定是否接收所述候选小区的SIB9和/或需要接收SIB9的候选小区的标识。
  76. 根据权利要求72至75中任一项所述的设备，其中，所述SIB9包括UTC，所述确定单元还用于基于所述SIB9中的UTC确定传播时延，并根据所述传播时延确定TA。
  77. 根据权利要求45至76中任一项所述的设备，其中，所述候选小区的配置信息中还包括测量间隙配置信息。
  78. 根据权利要求76或77所述的设备，其中，所述设备还包括：
    第二上报单元，用于上报所述TA。
  79. 根据权利要求45至78中任一项所述的设备，其中，所述确定单元还用于在接收到切换命令的情况下，基于第二条件确定所述终端设备获取的TA是否有效。
  80. 根据权利要求79所述的设备，其中，所述确定单元还用于执行以下至少之一：
    在满足所述第二条件下，确定所述终端设备获取的TA有效；
    在不满足所述第二条件下，确定所述终端设备获取的TA无效，发起随机接入过程，重新获取TA。
  81. 根据权利要求79或80所述的设备，其中，所述第二条件包括以下至少之一：
    第二定时器是否处于运行状态；
    第一参考信号发送时的RSRP与接收到L1和/或L2信令时的RSRP差值是否大于第三阈值。
  82. 根据权利要求81所述的设备，其中，所述第二定时器在所述终端设备发送所述第一参考信号后启动。
  83. 根据权利要求79至82中任一项所述的设备，其中，所述切换命令是L1信令和/或L2信令。
  84. 根据权利要求79至83中任一项所述的设备，其中，所述切换命令通过MAC CE和/或DCI携带。
  85. 根据权利要求79至84中任一项所述的设备，其中，所述切换命令包括以下至少之一：
    目标小区标识；
    所述TA；
    小区无线网络临时标识C-RNTI；
    终端设备专用信道和/或公共信道的TCI状态；
    辅小区SCELL激活和/或去激活信息以及相应的TCI状态。
  86. 根据权利要求85所述的设备，其中，所述公共信道包括公共PDCCH和/或公共PDSCH；
    所述终端设备专用信道的TCI状态包括以下至少之一：所述终端设备专用的PDCCH的TCI状态、所述终端设备专用的PDSCH的TCI状态、所有PUSCH的TCI状态、所有PUCCH的TCI状态。
  87. 根据权利要求45至86中任一项所述的设备，其中，所述候选小区的配置信息还包括以下至少之一：
    候选小区标识；
    新的C-RNTI；
    所选安全算法的候选小区安全算法信息；
    专用的随机接入资源；
    随机接入资源和同步信号块SSB之间的关联；
    随机接入资源和终端设备特定的CSI-RS配置之间的关联；
    公共的随机接入资源；
    候选小区的系统信息。
  88. 根据权利要求45至87中任一项所述的设备，其中，所述TA包括所述终端设备的目标小区的TA。
  89. 一种终端设备，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以使所述终端设备执行如权利要求1至44中任一项所述的方法。
  90. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求1至44中任一项所述的方法。
  91. 一种计算机可读存储介质，用于存储计算机程序，当所述计算机程序被设备运行时使得所述设备执行如权利要求1至44中任一项所述的方法。
  92. 一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求1至44中任一项所述的方法。
  93. 一种计算机程序，所述计算机程序使得计算机执行如权利要求1至44中任一项所述的方法。
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102932907A (zh) * 2011-08-11 2013-02-13 华为技术有限公司 一种获取同步的处理方法以及设备
WO2017050010A1 (zh) * 2015-09-22 2017-03-30 中兴通讯股份有限公司 上行同步方法、设备和系统
CN107027156A (zh) * 2016-01-29 2017-08-08 华为技术有限公司 一种发送语音帧的方法和终端设备
CN111865529A (zh) * 2019-04-30 2020-10-30 华为技术有限公司 获取时间提前量的方法与装置
WO2020227857A1 (zh) * 2019-05-10 2020-11-19 Oppo广东移动通信有限公司 用于随机接入的方法及设备

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CN102932907A (zh) * 2011-08-11 2013-02-13 华为技术有限公司 一种获取同步的处理方法以及设备
WO2017050010A1 (zh) * 2015-09-22 2017-03-30 中兴通讯股份有限公司 上行同步方法、设备和系统
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WO2020227857A1 (zh) * 2019-05-10 2020-11-19 Oppo广东移动通信有限公司 用于随机接入的方法及设备

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