WO2020073258A1 - 一种同步指示方法、终端设备及网络设备 - Google Patents

一种同步指示方法、终端设备及网络设备 Download PDF

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Publication number
WO2020073258A1
WO2020073258A1 PCT/CN2018/109724 CN2018109724W WO2020073258A1 WO 2020073258 A1 WO2020073258 A1 WO 2020073258A1 CN 2018109724 W CN2018109724 W CN 2018109724W WO 2020073258 A1 WO2020073258 A1 WO 2020073258A1
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Prior art keywords
network device
terminal device
target network
value
terminal
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PCT/CN2018/109724
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English (en)
French (fr)
Inventor
卢前溪
尤心
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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.)
Filing date
Publication date
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/CN2018/109724 priority Critical patent/WO2020073258A1/zh
Priority to CN201880097283.2A priority patent/CN112655252B/zh
Publication of WO2020073258A1 publication Critical patent/WO2020073258A1/zh
Priority to US17/203,304 priority patent/US20210212004A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes

Definitions

  • the present invention relates to the field of information processing technology, and in particular, to a synchronization indication method, terminal device, network device, chip, computer-readable storage medium, computer program product, and computer program.
  • the user when the user receives the RRC configuration message, he will reconfigure PDCP / RLC / MAC / lower layer etc. as the stack of the corresponding target network device according to the handover configuration; Uplink (UL) / downlink (DL) data transmission and reception of network equipment.
  • UL Uplink
  • DL downlink
  • the TA difference may be different between the terminal device and the network device. Therefore, how to synchronize Processing is a problem that needs to be solved.
  • embodiments of the present invention provide a synchronization indication method, terminal device, network device, chip, computer-readable storage medium, computer program product, and computer program.
  • an embodiment of the present invention provides a synchronization indication method, which is applied to a terminal device and includes:
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a synchronization indication method, which is applied to a terminal device and includes:
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a synchronization indication method, which is applied to a network device and includes:
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a synchronization indication method, which is applied to a network device and includes:
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a synchronization indication method, which is applied to a network device and includes:
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • an embodiment of the present invention provides a synchronization indication method, which is applied to a terminal device and includes:
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • an embodiment of the present invention provides a terminal device, including:
  • the first communication unit receives synchronization indication information sent from the source network device
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a terminal device, including:
  • the second communication unit sends synchronization indication information to the network device
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a network device, including:
  • the third communication unit receives the synchronization instruction information sent by the terminal device
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a network device, including:
  • the fourth communication unit sends synchronization indication information to the terminal device
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • an embodiment of the present invention provides a network device, including:
  • the fifth communication unit sends synchronization indication information to the terminal device
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • an embodiment of the present invention provides a terminal device, including:
  • a sixth communication unit receiving synchronization indication information sent by the network device
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • an embodiment of the present invention provides a terminal device, including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to execute the methods in the first aspect, the second aspect, the sixth aspect, or various implementations thereof.
  • a network device including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory to perform the methods in the third aspect to the fifth aspect or the respective implementations thereof.
  • a chip is provided for implementing any one of the foregoing first to sixth aspects or the method in each implementation manner thereof.
  • the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes any one of the first to sixth aspects described above or various implementations thereof method.
  • a computer-readable storage medium for storing a computer program that causes a computer to execute the method in any one of the above first to second aspects or various implementations thereof.
  • a computer program product including computer program instructions, which cause the computer to execute the method in any one of the above first to sixth aspects or in various implementations thereof.
  • a computer program which, when run on a computer, causes the computer to execute the method in any one of the above first to sixth aspects or the various implementations thereof.
  • the synchronization indication information is obtained, and according to the assistance of the synchronization indication information, the TA value of the terminal device and the source network device, the TA value of the target network device, and the TA difference between the two are obtained At least one of them, so as to ensure that the terminal device acquires the synchronization difference between the source network device and the target network device when switching, and does not have to communicate with the specified network device at the specified time.
  • FIG. 1 is a schematic diagram 1 of a communication system architecture provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart 1 of a synchronization indication method provided by an embodiment of the present application
  • FIG. 3 is a schematic diagram of a handover processing scenario provided by an embodiment of the present invention.
  • FIG. 4 is a second schematic flowchart of a synchronization indication method provided by an embodiment of the present application.
  • FIG. 5 is a third schematic flowchart of a synchronization indication method provided by an embodiment of the present application.
  • FIG. 6 is a fourth schematic flowchart of a synchronization indication method provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a network device composition provided by an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a composition of a communication device according to an embodiment of the present invention.
  • FIG. 10 is a schematic block diagram of a chip provided by an embodiment of the present application.
  • FIG. 11 is a second schematic diagram of a communication system architecture provided by an embodiment of the present application.
  • GSM Global System of Mobile
  • CDMA Code Division Multiple Access
  • WCDMA Broadband Code Division Multiple Access
  • GSM Global System of Mobile
  • CDMA Code Division Multiple Access
  • WCDMA Broadband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Freq terminal equipment ncy Division Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • the communication system 100 applied in the embodiments of the present application may be as shown in FIG. 1.
  • the communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, terminal).
  • the network device 110 can provide communication coverage for a specific geographic area, and can communicate with terminal devices located within the coverage area.
  • the network device 110 may be a network device (Base Transceiver Station, BTS) in a GSM system or a CDMA system, a network device (NodeB, NB) in a WCDMA system, or an evolution in an LTE system Type network equipment (Evolutional Node B, eNB or network equipment), or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network equipment may be a mobile switching center, a relay station, an access point , Vehicle-mounted devices, wearable devices, hubs, switches, bridges, routers, network-side devices in 5G networks or network devices in future public land mobile networks (Public Land Mobile Network, PLMN).
  • BTS Base Transceiver Station
  • NodeB, NB network device
  • Evolutional Node B, eNB or network equipment or a wireless controller in a cloud radio access network
  • CRAN Cloud Radio Access Network
  • the network equipment may be a mobile switching center, a relay station, an access point , Vehicle-mounted devices,
  • the communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110.
  • terminal equipment includes, but is not limited to, connections via wired lines, such as via public switched telephone networks (Public Switched Telephones, Networks, PSTN), digital terminal equipment lines (Digital Subscriber Lines, DSL), digital cables, direct cables Connection; and / or another data connection / network; and / or via a wireless interface, eg, for cellular networks, wireless local area networks (Wireless Local Area Network, WLAN), digital TV networks such as DVB-H networks, satellite networks, AM -FM broadcast transmitter; and / or another terminal device set to receive / transmit communication signals; and / or Internet of Things (IoT) equipment.
  • IoT Internet of Things
  • a terminal device set to communicate through a wireless interface may be referred to as a "wireless communication terminal", “wireless terminal”, or “mobile terminal”.
  • mobile terminals include, but are not limited to, satellite or cellular phones; Personal Communication Systems (PCS) terminals that can combine cellular radiotelephones with data processing, fax, and data communication capabilities; can include radiotelephones, pagers, Internet / internal PDA with networked access, web browser, notepad, calendar, and / or Global Positioning System (GPS) receiver; and conventional laptop and / or palm-type receivers or others including radiotelephone transceivers Electronic device.
  • PCS Personal Communication Systems
  • GPS Global Positioning System
  • Terminal equipment can refer to access terminal, terminal equipment (User Equipment), terminal equipment unit, terminal equipment station, mobile station, mobile station, remote station, remote terminal, mobile equipment, terminal equipment terminal, terminal, wireless communication Equipment, terminal equipment agent or terminal equipment device.
  • Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital processing (Personal Digital Assistant (PDA), wireless communication Functional handheld devices, computing devices, or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in a 5G network, or terminal devices in a PLMN that will evolve in the future, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • terminal device 120 may perform terminal direct connection (Device to Device, D2D) communication.
  • D2D Terminal Direct connection
  • the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.
  • NR New Radio
  • FIG. 1 exemplarily shows one network device and two terminal devices.
  • the communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within the coverage area. This application The embodiment does not limit this.
  • the communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.
  • network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.
  • the devices with communication functions in the network / system in the embodiments of the present application may be referred to as communication devices.
  • the communication device may include a network device 110 and a terminal device 120 with a communication function, and the network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here.
  • the communication device may also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities, which are not limited in the embodiments of the present application.
  • An embodiment of the present invention provides a synchronization indication method, which is applied to a terminal device, as shown in FIG. 2, and includes:
  • Step 201 Receive synchronization instruction information sent by the source network device
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • Timing advance (TA) values of the terminal device and source network device TA values of the terminal device and target network device; TA of the terminal device and source network device, and TA of the terminal device and target network device difference.
  • the synchronization indication information received by the terminal device may be carried by an RRC message.
  • the synchronization indication information is sent from the source network device to the terminal device, that is, it can be sent to the terminal device by carrying the synchronization indication information in the RRC message.
  • the RRC message includes at least: a reconfiguration message and a handover command. That is, if the synchronization indication information can be sent by the network device to the terminal device, it can be sent to the terminal device in an RRC message, that is, a reconfiguration message, and a handover command.
  • This embodiment may also provide measurement configuration for the terminal device, and of course may not provide measurement configuration for the terminal device.
  • the method further includes: performing measurement based on the measurement configuration; obtaining a measurement result, and reporting the measurement result to the network side, which may specifically be reported to the network On the source network device side; further, the source network device may determine the TA difference between the terminal device and the source network device, and between the terminal device and the target network device based on the measurement result.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the RRC message can also be a new RRC message. Its composition can be introduced by introducing a new measurement IE in the RRC message.
  • the IE is configured for measurement and is dedicated to synchronization indication information. It can be set according to the actual situation. No more details.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the network side may use a new RRC message or RRC reconfiguration information to instruct the UE to report the TA value at the source base station, or the recommended TA value, or the recommended TA value range.
  • the process flow for handover can be seen in Figure 3, including: handover preparation stage, including steps 1-6 in the figure: the source network device sends measurement control to the terminal device, which can contain synchronization indication information; the terminal device performs targeting for multiple network devices After the measurement of the cell or cell, send a measurement report to the source network device; the source network device makes a handover decision based on the measurement report (or in combination with RRM information); the source network device sends a handover request to the target network device to prepare the target network device for handover; the target The network device performs switching permission control according to the switching request; when the target network device determines to perform switching, it sends a switching request confirmation to the source network device.
  • the target network device generates RRC information, sends the RRC connection reconfiguration information to the source network device, and the source network device sends the RRC connection reconfiguration information to the terminal device
  • the terminal device obtains synchronization indication information according to the connection reconfiguration information and performs the handover process
  • the source network device sends the SN status to the target network device
  • the terminal device synchronizes with the target network device and then receives
  • the target network device performs UL allocation, and sends RRC connection reconfiguration completion information to the target network device.
  • the target network device sends a path switch request to the MME to notify the MME terminal device to change the cell; the MME sends a bearer adjustment request to the serving gateway, and the MME performs the downlink path switch After the service gateway completes the processing, it sends the bearer adjustment completion processing to the MME, and the MME sends a confirmation message of the path switching request to the target network device; the target network device notifies the source network device that the terminal device context releases the source network device to release resources.
  • the synchronization indication information further includes at least one of the following:
  • TA value of the terminal device on the target network device side TA offset value of the terminal device on the source network device and the target network device; TA adjustment factor.
  • the terminal device receives the synchronization indication information sent by the network device, which may include the TA value of the terminal device in the target network device; it may be sent to the source network device through the target network device, so that the source network device sends it to the terminal device;
  • the manner in which the target network device obtains the TA value may be in the manner described above, which will not be repeated here.
  • the TA offset value can be the offset time indicated by the TA command; the TA offset value of the target network device can also be sent from the target network device to the source network device, and then the source network device sets the target The TA offset value of the network device and the TA value of the source network device are sent to the terminal device together.
  • the TA adjustment factor may be a value set by the network device side according to actual conditions, and may include: a TA adjustment factor corresponding to the target network device, and / or a TA adjustment factor of the source network device.
  • the TA adjustment factor corresponding to the target network device may be used to calculate the TA value of the target network device based on the TA value of the source network device and the TA adjustment factor of the target network device;
  • the TA adjustment factor of the source network device may be used to calculate the TA value of the source network device based on the TA value of the target network device and the TA adjustment factor of the source network device.
  • the TA value of the source network device * the TA adjustment factor of the target network device the TA value of the target network device; it should be understood that the calculation method of the source network device is similar to it, not Let me repeat them.
  • the method further includes:
  • the instruction information includes at least one of the following:
  • the method further includes:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • the TA value of the terminal device and the target network device may be determined based on the indication information and / or the synchronization indication information.
  • the TA difference between the terminal device and the source network device and the target network device can also be determined based on the TA value between the terminal device and the source network device and the TA value between the terminal device and the target network device.
  • a way may be determined by using indication information, for example, it may be estimated based on the difference between the time boundary between the terminal device and the source network device and the time boundary between the terminal device and the target network device.
  • the TA difference between the terminal device and the source network device and the target network device is obtained.
  • the time boundary between the terminal device and the network device can be understood as the starting point of the wireless frame.
  • the TA difference between the terminal device and the source network device and the target network device may be determined and obtained based on the time boundary difference between the terminal device and the source network device, and between the terminal device and the target network device.
  • This method can be mainly used in downlink synchronization.
  • another way may be to determine the TA difference directly according to the synchronization indication information, for example, it may include at least one of the following:
  • the TA offset value of the terminal device at the source network device and the TA offset value of the terminal device at the target network device calculate the difference between the two as the TA difference
  • the TA value of the target network device is calculated based on the TA adjustment factor corresponding to the target network device, and the TA difference between the target network device and the source network device is determined based on the TA value of the target network device; and / or the TA adjustment factor based on the source network device Determine the TA value of the source network device, and combine the TA value of the source network device and the TA value of the target network device to determine the TA difference between the two.
  • the TA difference is determined in combination with the synchronization indication information and the indication information, and the foregoing two processes may be used in combination; for example, it may include:
  • the TA value between devices can also be calculated to obtain the TA difference between the two.
  • the TA value of the target network device can be calculated in combination with the TA adjustment factor corresponding to the target network device, combined with the target network device ’s TA and the TA value of the source network device determine the TA difference between the two; and / or, determine the TA value of the source network device based on the TA adjustment factor of the source network device, combining the TA value of the source network device and the TA value of the target network device, Determine the TA difference between the two.
  • the TA difference may be further determined, or the TA difference may not be calculated and only the TA value may be obtained.
  • the specific implementation may be set according to actual conditions, and is not limited in this embodiment.
  • the timing advance can be used for upstream transmission, which means that in order to arrive at the network device at the desired time, the upstream transmission delay due to the distance is estimated, and corresponding Time to send out packets.
  • LTE proposes an uplink timing advance (Uplink Timing Advance) mechanism. From the perspective of the terminal device, TA is essentially a negative offset between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. By appropriately controlling the offset of each terminal device, the network device can control the time when the uplink signals from different terminal devices arrive at the network device.
  • the network device can determine the TA value of each terminal device by measuring the uplink transmission of the terminal device; it can be understood that as long as the terminal device has uplink transmission, the network device can be used to estimate TA value.
  • This embodiment can be applied to a variety of scenarios, and can be different handover scenarios for any terminal device and source network device / target network device TA, such as for a handover that occurs between network devices, or cells within the network device but at different frequency points, Or other network devices that are not synchronized.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key
  • the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service, Adaptation, Protocol), different packet data aggregation protocols (PDCP, Packet, Data, Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service, Adaptation, Protocol
  • PDCP Packet, Data, Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a synchronization indication method, which is applied to a terminal device, as shown in FIG. 4, including:
  • Step 401 Send synchronization indication information to the network device
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • the network device may be the source network device or the target network device; in other words, the terminal device may send the synchronization indication information to the source network device, or may send the synchronization indication information to Target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least a measurement report message.
  • the synchronization indication information includes a measurement report message
  • the measurement configuration sent from the source network device or the target network device on the network side can also be received, and the measurement can be performed based on the measurement configuration; when the measurement result is obtained, the measurement result can be reported To the network side;
  • the source network device or the target network device may determine the TA difference between the terminal device and the source network device, and between the terminal device and the target network device according to the measurement result in the measurement report message.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the process flow for handover can be seen in FIG. 3, including: handover preparation stage, including steps 1-6 in the figure: the source network device sends measurement control to the terminal device; after the terminal device performs measurement for multiple network devices or cells, Send a measurement report to the source network device, which may contain synchronization indication information; the source network device makes a handover decision based on the measurement report (or in combination with RRM information); the source network device sends a handover request to the target network device to prepare the target network device for handover; the target The network device performs switching permission control according to the switching request; when the target network device determines to perform switching, it sends a switching request confirmation to the source network device.
  • the target network device generates RRC information, sends the RRC connection reconfiguration information to the source network device, and the source network device sends the RRC connection reconfiguration information to the terminal device
  • the terminal device obtains synchronization indication information according to the connection reconfiguration information and performs the handover process
  • the source network device sends the SN status to the target network device
  • the terminal device synchronizes with the target network device and then receives
  • the target network device performs UL allocation, and sends RRC connection reconfiguration completion information to the target network device.
  • the target network device sends a path switch request to the MME to notify the MME terminal device to change the cell; the MME sends a bearer adjustment request to the serving gateway, and the MME performs the downlink path switch After the service gateway completes the processing, it sends the bearer adjustment completion processing to the MME, and the MME sends a confirmation message of the path switching request to the target network device; the target network device notifies the source network device that the terminal device context releases the source network device to release resources.
  • the timing advance can be used for upstream transmission, which means that in order to arrive at the network device at the desired time, the upstream transmission delay due to the distance is estimated, and corresponding Time to send out packets.
  • LTE proposes an uplink timing advance (Uplink Timing Advance) mechanism. From the perspective of the terminal device, TA is essentially a negative offset between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. By appropriately controlling the offset of each terminal device, the network device can control the time when the uplink signals from different terminal devices arrive at the network device.
  • the network device can determine the TA value of each terminal device by measuring the uplink transmission of the terminal device; it can be understood that as long as the terminal device has uplink transmission, the network device can be used to estimate TA value.
  • the synchronization indication information further includes at least one of the following:
  • the synchronization indication information may also include: a list of candidate target cells; the list of candidate target cells includes but is not limited to at least one of the following: cell identifier (cell id), measurement result (Such as RSRP), positioning information, road loss information.
  • cell id cell identifier
  • RSRP measurement result
  • positioning information road loss information.
  • the synchronization indication information includes the measurement difference of the terminal device between the source network device and the target network device (such as RSRP), or the distance difference between the terminal device between the source network device and the target network device (such as obtained according to a positioning reference signal, etc.) ), It can also be recommended TA value information, such as the TA value of the source cell, or various combinations.
  • the terminal device can measure the signal measurement result of the source network device and the signal measurement result of the target network device, and determine the signal measurement difference between the source network device and the target network device of the terminal device based on the two results;
  • the distance difference between the terminal device and the source network device and the target network device can be determined by the physical location of the source network device and the target network device and the physical location of the terminal device; where the way to obtain the physical location of the network device can be the network It is pre-configured on the side, or can be obtained from the network side, which is not limited here.
  • the physical location of the terminal device itself can be determined according to the GPS module. Of course, it can also be determined according to the cell where it is located, or, The terminal device determines the location information based on the measurement of the positioning reference signal, and does not perform exhaustive exhaustion.
  • the TA value information of the terminal device and the network device may include at least one of the following: the TA value of the source network device, the TA offset value between the source network device and the TA offset value between the target network device, and The TA value of the target network device, the TA adjustment factor of the target network device, and the TA adjustment factor of the source network device.
  • the terminal device when the terminal device obtains the relevant information of the at least one candidate target network device configured on the network side in advance, it may directly notify the network side of the identification information of the currently selected target network device when the handover fails or the handover is performed.
  • the identification of the target network device to be switched can be selected for the terminal device; of course, several candidate target network devices with better communication quality can also be selected for the terminal device, and the identification of the candidate target network device can be sent to the source For network equipment, the source network equipment selects the target network equipment for it.
  • the better communication quality can be determined by the measurement result of the reference signal, for example, it can be that the signal-to-noise ratio is greater than the preset signal-to-noise ratio threshold, or the top N of the signal-to-noise ratio (N is equal to or greater 1 and less than or equal to the number of all candidate network devices).
  • the signal-to-noise ratio is greater than the preset signal-to-noise ratio threshold, or the top N of the signal-to-noise ratio (N is equal to or greater 1 and less than or equal to the number of all candidate network devices).
  • other parameters can also be used to measure the quality of communication.
  • it can be signal strength, noise strength, or a combination of these parameters. It is not exhaustive here, and it should be understood that the selected method is based on the above The method of selecting the noise ratio is similar and will not be described in detail.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key
  • the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service Adaptation), different packet data aggregation protocols (PDCP, Packet Data Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service Adaptation
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • Low layer low layer
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a synchronization indication method, which is applied to a network device, as shown in FIG. 5, including:
  • Step 501 Receive synchronization instruction information sent by the terminal device
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • this embodiment may further include: acquiring the timing advance TA difference between the terminal device and the source network device and between the terminal device and the target network device based on the synchronization indication information.
  • the network device may be the source network device or the target network device; in other words, the terminal device may send the synchronization indication information to the source network device, or may send the synchronization indication information to Target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least a measurement report message.
  • the synchronization indication information includes a measurement report message
  • the measurement configuration sent from the source network device or the target network device on the network side can also be received, and the measurement can be performed based on the measurement configuration; when the measurement result is obtained, the measurement result can be reported To the network side;
  • the network device determines the TA difference between the terminal device and the source network device, and between the terminal device and the target network device according to the measurement result in the measurement report message.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the timing advance can be used for upstream transmission, which means that in order to arrive at the network device at the desired time, the upstream transmission delay due to the distance is estimated, and corresponding Time to send out packets.
  • LTE proposes an uplink timing advance (Uplink Timing Advance) mechanism. From the perspective of the terminal device, TA is essentially a negative offset between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. By appropriately controlling the offset of each terminal device, the network device can control the time when the uplink signals from different terminal devices arrive at the network device.
  • the network device can determine the TA value of each terminal device by measuring the uplink transmission of the terminal device; it can be understood that as long as the terminal device has uplink transmission, the network device can be used to estimate TA value.
  • the synchronization indication information further includes at least one of the following:
  • the synchronization indication information may also include: a list of candidate target cells; the list of candidate target cells includes but is not limited to at least one of the following: cell identifier (cell id), measurement result (Such as RSRP), positioning information, road loss information.
  • cell id cell identifier
  • RSRP measurement result
  • positioning information road loss information.
  • the synchronization indication information includes the measurement difference of the terminal device between the source network device and the target network device (such as RSRP), or the distance difference between the terminal device between the source network device and the target network device (such as obtained according to a positioning reference signal, etc.) ), It can also be recommended TA value information, such as the TA value of the source cell, or various combinations.
  • the terminal device can measure the signal measurement result of the source network device and the signal measurement result of the target network device, and determine the signal measurement difference between the source network device and the target network device of the terminal device based on the two results;
  • the distance difference between the terminal device and the source network device and the target network device can be determined by the physical location of the source network device and the target network device and the physical location of the terminal device; where the way to obtain the physical location of the network device can be the network It is pre-configured on the side, or it can be obtained from the network side, which is not limited here.
  • the physical location of the terminal device can be determined according to the GPS module. Of course, it can also be determined according to the cell where its own period is located, or , The terminal device determines the location information according to the measurement of the positioning reference signal, and does not perform exhaustive exhaustion.
  • the TA value information of the terminal device and the network device may include at least one of the following: the TA value of the source network device, the TA offset value between the source network device and the TA offset value between the target network device, and The TA value of the target network device, the TA adjustment factor of the target network device, and the TA adjustment factor of the source network device.
  • the network device may perform at least one of the following:
  • the TA difference is directly determined
  • the TA value of the source network device and the TA adjustment factor of the target network device determine the TA values of the source network device and the target network device;
  • the TA value of the source network device and the TA adjustment factor of the target network device determine the TA value of the source network device and the target network device, and then determine the TA difference;
  • the TA of the target network device is combined with the TA adjustment factor of the source network device to determine the TA values of the source network device and the target network device;
  • the TA of the target network device is combined with the TA adjustment factor of the source network device to determine the TA values of the source network device and the target network device, thereby determining the TA difference.
  • the synchronization indication information needs to include the target network device identification or the selected candidate target network Equipment Identity.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key
  • the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service, Adaptation, Protocol), different packet data aggregation protocols (PDCP, Packet, Data, Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service, Adaptation, Protocol
  • PDCP Packet, Data, Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a synchronization indication method, which is applied to a network device, as shown in FIG. 6, and includes:
  • Step 601 Send synchronization indication information to the terminal device
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the synchronization indication information is sent from the source network device to the terminal device, that is, it can be sent to the terminal device by carrying the synchronization indication information in the RRC message.
  • the RRC message includes at least: a reconfiguration message and a handover command. That is to say, if the synchronization indication information can be sent by the network device to the terminal device, the terminal device can be notified in an RRC message.
  • the RRC message includes but is not limited to a reconfiguration message and a handover command.
  • This embodiment may also provide measurement configuration for the terminal device, and of course may not provide measurement configuration for the terminal device.
  • the measurement is performed based on the measurement configuration; the measurement result is obtained, and the measurement result is reported to the network side, which may specifically be the source network device side reported to the network side ; Further, the source network device may determine the TA difference between the terminal device and the source network device, and between the terminal device and the target network device based on the measurement result.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the RRC message can also be a new RRC message. Its composition can be introduced by introducing a new measurement IE in the RRC message.
  • the IE is configured for measurement and is dedicated to synchronization indication information. It can be set according to the actual situation. No more details.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the network device on the network side may use a new RRC message or RRC reconfiguration information to instruct the UE to report the TA value at the source base station, or the recommended TA value, or the recommended TA value range.
  • the synchronization indication information further includes at least one of the following:
  • TA value of the terminal device on the target network device side TA offset value of the terminal device on the source network device and the target network device; TA adjustment factor.
  • the terminal device receives the synchronization indication information sent by the network device, which may include the TA value of the terminal device in the target network device; it may be sent to the source network device through the target network device, so that the source network device sends it to the terminal device;
  • the manner in which the target network device obtains the TA value may be in the manner described above, which will not be repeated here.
  • the TA offset value can be the offset time indicated by the TA command; the TA offset value of the target network device can also be sent from the target network device to the source network device, and then the source network device sets the target The TA offset value of the network device and the TA value of the source network device are sent to the terminal device together.
  • the TA adjustment factor may be a value set by the network device side according to actual conditions, and may include: a TA adjustment factor corresponding to the target network device, and / or a TA adjustment factor of the source network device.
  • the TA adjustment factor corresponding to the target network device may be used to calculate the TA value of the target network device based on the TA value of the source network device and the TA adjustment factor of the target network device;
  • the TA adjustment factor of the source network device may be used to calculate the TA value of the source network device based on the TA value of the target network device and the TA adjustment factor of the source network device.
  • the TA value of the source network device * the TA adjustment factor of the target network device the TA value of the target network device; it should be understood that the calculation method of the source network device is similar to it, not Let me repeat them.
  • the method further includes: sending instruction information;
  • the indication information includes at least one of the following: the time boundary between the terminal device and the source network device and the target network device; the time boundary difference between the terminal device and the source network device and the target network device.
  • This embodiment can be applied to a variety of scenarios, and can be different handover scenarios for any terminal device and source network device / target network device TA, such as for a handover that occurs between network devices, or cells within the network device but at different frequency points, Or other network devices that are not synchronized.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key
  • the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service, Adaptation, Protocol), different packet data aggregation protocols (PDCP, Packet, Data, Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service, Adaptation, Protocol
  • PDCP Packet, Data, Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a synchronization indication method, which is applied to a network device and includes:
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the network device may configure at least one candidate target network device for the terminal device to perform measurement; and, the report of the terminal device can be obtained.
  • assisting the network device to obtain the above information may be directly acquiring at least one of the following reported by the terminal device: the timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device ; TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the network device can obtain at least one of the following according to the assistance of the measurement results: the timing advance TA value of the terminal device and the source network device; the terminal device and the candidate target The TA value of the network device; the TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least: a reconfiguration message and a measurement command.
  • the synchronization indication information includes at least one of the following: the identification of the candidate target network device; the measurement object configuration; and the report configuration.
  • the identification of the candidate target network device may be one or more, that is, the network device notifies the identification of all candidate target network devices that need to be measured to the terminal device, which may be all network devices that can be measured by the terminal device At least part of the network equipment.
  • the configuration of the measurement object may include configuring the terminal device to perform RSRP measurement, distance difference, and path loss difference measurement.
  • the reporting configuration may include the reported information format and the reported information content.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the network device may also advance the TA value according to the timing of the terminal device and the source network device; the terminal device and the candidate target network device TA value; at least one piece of information of the TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device to select the target network device for the terminal device, and then execute the handover process flow, which will not be repeated here .
  • An embodiment of the present invention provides a synchronization indication method, which is applied to a terminal device and includes:
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the network device may configure at least one candidate target network device for the terminal device to perform measurement; and, the report of the terminal device can be obtained.
  • assisting the network device to obtain the above information may be directly acquiring at least one of the following reported by the terminal device: the timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device ; TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the network device can obtain at least one of the following according to the assistance of the measurement results: the timing advance TA value of the terminal device and the source network device; the terminal device and the candidate target The TA value of the network device; the TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least: a reconfiguration message and a measurement command.
  • the synchronization indication information includes at least one of the following: the identification of the candidate target network device; the measurement object configuration; and the report configuration.
  • the identification of the candidate target network device may be one or more, that is, the network device notifies the identification of all candidate target network devices that need to be measured to the terminal device, which may be all network devices that can be measured by the terminal device At least part of the network equipment.
  • the configuration of the measurement object may include configuring the terminal device to perform RSRP measurement, distance difference, and path loss difference measurement.
  • the reporting configuration may include the reported information format and the reported information content.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the method further includes:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the candidate target network device configured by the network device may be measured according to the identifier of the candidate target network device in the synchronization indication information, and at least one of RSRP, road loss difference, and distance difference may be obtained, and then the terminal device may be determined At least one of the TA value of the timing advance from the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the network device may also advance the TA value according to the timing of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the terminal device and At least one of the source network device and the TA difference between the terminal device and the candidate target network device selects the target network device for the terminal device, and then executes the handover processing flow shown in FIG. 3, which will not be repeated here.
  • the foregoing determination of the timing advance TA value of the terminal device and the source network device according to the synchronization instruction information; the TA value of the terminal device and the candidate target network device; the terminal device and the source network device and the terminal device and The manner of at least one of the TA difference of the candidate target network device may be:
  • the TA value corresponding to the source network device is estimated according to the RSRP corresponding to the source network device, and the candidate target network device adopts the same processing method, which is not described in detail; on this basis, the TA difference can be further calculated;
  • At least one TA difference may be estimated based on the at least one distance difference.
  • An embodiment of the present invention provides a terminal device, as shown in FIG. 7, including:
  • the first communication unit 71 receives synchronization indication information sent by the source network device
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • Timing advance (TA) values of the terminal device and source network device TA values of the terminal device and target network device; TA of the terminal device and source network device, and TA of the terminal device and target network device difference.
  • the synchronization indication information received by the terminal device may be carried by an RRC message.
  • the synchronization indication information is sent from the source network device to the terminal device, that is, it can be sent to the terminal device by carrying the synchronization indication information in the RRC message.
  • the RRC message includes at least: a reconfiguration message and a handover command. That is, if the synchronization indication information can be sent by the network device to the terminal device, it can be sent to the terminal device in an RRC message, that is, a reconfiguration message, and a handover command.
  • This embodiment may also provide measurement configuration for the terminal device, and of course may not provide measurement configuration for the terminal device.
  • the method further includes: performing measurement based on the measurement configuration; obtaining a measurement result, and reporting the measurement result to the network side, which may specifically be reported to the network On the source network device side; further, the source network device may determine the TA difference between the terminal device and the source network device, and between the terminal device and the target network device based on the measurement result.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the RRC message can also be a new RRC message. Its composition can be introduced by introducing a new measurement IE in the RRC message.
  • the IE is configured for measurement and is dedicated to synchronization indication information. It can be set according to the actual situation. No more details.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the network side may use a new RRC message or RRC reconfiguration information to instruct the UE to report the TA value at the source base station, or the recommended TA value, or the recommended TA value range.
  • the synchronization indication information further includes at least one of the following:
  • TA value of the terminal device on the target network device side TA offset value of the terminal device on the source network device and the target network device; TA adjustment factor.
  • the terminal device receives the synchronization indication information sent by the network device, which may include the TA value of the terminal device in the target network device; it may be sent to the source network device through the target network device, so that the source network device sends it to the terminal device;
  • the manner in which the target network device obtains the TA value may be in the manner described above, which will not be repeated here.
  • the TA offset value can be the offset time indicated by the TA command; the TA offset value of the target network device can also be sent from the target network device to the source network device, and then the source network device sets the target The TA offset value of the network device and the TA value of the source network device are sent to the terminal device together.
  • the TA adjustment factor may be a value set by the network device side according to actual conditions, and may include: a TA adjustment factor corresponding to the target network device, and / or a TA adjustment factor of the source network device.
  • the TA adjustment factor corresponding to the target network device may be used to calculate the TA value of the target network device based on the TA value of the source network device and the TA adjustment factor of the target network device;
  • the TA adjustment factor of the source network device may be used to calculate the TA value of the source network device based on the TA value of the target network device and the TA adjustment factor of the source network device.
  • the TA value of the source network device * the TA adjustment factor of the target network device the TA value of the target network device; it should be understood that the calculation method of the source network device is similar to it, not Let me repeat them.
  • the first communication unit 71 receives the instruction information sent by the source network device
  • the indication information includes at least one of the following: the time boundary between the terminal device and the source network device and the target network device; the time boundary difference between the terminal device and the source network device and the target network device.
  • the terminal device after receiving the synchronization indication information sent by the source network device, the terminal device further includes:
  • the first processing unit 72 determines at least one of the following based on the instruction information and / or the synchronization instruction information:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • the TA value of the terminal device and the target network device may be determined based on the indication information and / or the synchronization indication information.
  • the TA difference between the terminal device and the source network device and the target network device can also be determined based on the TA value between the terminal device and the source network device and the TA value between the terminal device and the target network device.
  • a way may be determined by using indication information, for example, it may be estimated based on the difference between the time boundary between the terminal device and the source network device and the time boundary between the terminal device and the target network device.
  • the TA difference between the terminal device and the source network device and the target network device is obtained.
  • the time boundary between the terminal device and the network device can be understood as the starting point of the wireless frame.
  • the TA difference between the terminal device and the source network device and the target network device may be determined and obtained based on the time boundary difference between the terminal device and the source network device, and between the terminal device and the target network device.
  • This method can be mainly used in downlink synchronization.
  • another way may be to determine the TA difference directly according to the synchronization indication information, for example, it may include at least one of the following:
  • the TA offset value of the terminal device at the source network device and the TA offset value of the terminal device at the target network device calculate the difference between the two as the TA difference
  • the TA value of the target network device is calculated based on the TA adjustment factor corresponding to the target network device, and the TA difference between the target network device and the source network device is determined based on the TA value of the target network device; and / or the TA adjustment factor based on the source network device Determine the TA value of the source network device, and combine the TA value of the source network device and the TA value of the target network device to determine the TA difference between the two.
  • the foregoing two processes may be used in combination; for example, it may include:
  • the TA value between devices can also be calculated to obtain the TA difference between the two.
  • the TA value of the target network device can be calculated in combination with the TA adjustment factor corresponding to the target network device, combined with the target network device ’s TA and the TA value of the source network device determine the TA difference between the two; and / or, determine the TA value of the source network device based on the TA adjustment factor of the source network device, combining the TA value of the source network device and the TA value of the target network device, Determine the TA difference between the two.
  • the TA difference may be further determined, or the TA difference may not be calculated and only the TA value may be obtained.
  • the specific implementation may be set according to actual conditions, and is not limited in this embodiment.
  • the timing advance can be used for upstream transmission, which means that in order to arrive at the network device at the desired time, the upstream transmission delay due to the distance is estimated, and corresponding Time to send out packets.
  • LTE proposes an uplink timing advance (Uplink Timing Advance) mechanism. From the perspective of the terminal device, TA is essentially a negative offset between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. By appropriately controlling the offset of each terminal device, the network device can control the time when the uplink signals from different terminal devices arrive at the network device.
  • the network device can determine the TA value of each terminal device by measuring the uplink transmission of the terminal device; it can be understood that as long as the terminal device has uplink transmission, the network device can be used to estimate TA value.
  • This embodiment can be applied to a variety of scenarios, and can be different handover scenarios for any terminal device and source network device / target network device TA, such as for a handover that occurs between network devices, or cells within the network device but at different frequency points, Or other network devices that are not synchronized.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key
  • the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service Adaptation), different packet data aggregation protocols (PDCP, Packet Data Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service Adaptation
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • Low layer low layer
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a terminal device, including:
  • the second communication unit sends synchronization indication information to the network device
  • the synchronization indication information is used to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • the network device may be the source network device or the target network device; in other words, the terminal device may send the synchronization indication information to the source network device, or may send the synchronization indication information to Target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least a measurement report message.
  • the synchronization indication information includes a measurement report message
  • the measurement configuration sent from the source network device or the target network device on the network side can also be received, and the measurement can be performed based on the measurement configuration; when the measurement result is obtained, the measurement result can be reported To the network side;
  • the auxiliary network device obtains the TA difference between the terminal device and the source network device and between the terminal device and the target network device, and the source network device or the target network device may determine the terminal device and The TA difference between the source network device and the terminal device and the target network device.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • timing advance can be used for uplink transmission
  • the synchronization indication information further includes at least one of the following: the signal measurement difference between the source network device and the target network device of the terminal device; the distance difference between the terminal device and the source network device and the target network device ; The path loss difference between the terminal device and the source network device and the target network device; the TA value information of the terminal device and the network device; the target network device identification; the candidate target network device identification selected by the terminal device.
  • the synchronization indication information may also include: a list of candidate target cells; the list of candidate target cells includes but is not limited to at least one of the following: cell identifier (cell id), measurement result (Such as RSRP), positioning information, road loss information.
  • cell id cell identifier
  • RSRP measurement result
  • positioning information road loss information.
  • the synchronization indication information includes the measurement difference of the terminal device between the source network device and the target network device (such as RSRP), or the distance difference between the terminal device between the source network device and the target network device (such as obtained according to a positioning reference signal, etc.) ), It can also be recommended TA value information, such as the TA value of the source cell, or various combinations.
  • the terminal device can measure the signal measurement result of the source network device and the signal measurement result of the target network device, and determine the signal measurement difference between the source network device and the target network device of the terminal device based on the two results;
  • the distance difference between the terminal device and the source network device and the target network device can be determined by the physical location of the source network device and the target network device and the physical location of the terminal device; where the way to obtain the physical location of the network device can be the network It is pre-configured on the side, or can be obtained from the network side, which is not limited here.
  • the physical location of the terminal device itself can be determined according to the GPS module. Of course, it can also be determined according to the cell where it is located, or, The terminal device determines the location information based on the measurement of the positioning reference signal, and does not perform exhaustive exhaustion.
  • the TA value information of the terminal device and the network device may include at least one of the following: the TA value of the source network device, the TA offset value between the source network device and the TA offset value between the target network device, and The TA value of the target network device, the TA adjustment factor of the target network device, and the TA adjustment factor of the source network device.
  • the terminal device when the terminal device obtains the relevant information of the at least one candidate target network device configured on the network side in advance, it may directly notify the network side of the identification information of the currently selected target network device when the handover fails or the handover is performed.
  • the identification of the target network device to be switched can be selected for the terminal device; of course, several candidate target network devices with better communication quality can also be selected for the terminal device, and the identification of the candidate target network device can be sent to the source For network equipment, the source network equipment selects the target network equipment for it.
  • the better communication quality can be determined by the measurement result of the reference signal, for example, it can be that the signal-to-noise ratio is greater than the preset signal-to-noise ratio threshold, or the top N of the signal-to-noise ratio (N is equal to or greater 1 and less than or equal to the number of all candidate network devices).
  • the signal-to-noise ratio is greater than the preset signal-to-noise ratio threshold, or the top N of the signal-to-noise ratio (N is equal to or greater 1 and less than or equal to the number of all candidate network devices).
  • other parameters can also be used to measure the quality of communication.
  • it can be signal strength, noise strength, or a combination of these parameters. It is not exhaustive here, and it should be understood that the selected method is based on the above The method of selecting the noise ratio is similar and will not be described in detail.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key; the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service Adaptation), different packet data aggregation protocols (PDCP, Packet Data Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service Adaptation
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • Low layer low layer
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a network device, including:
  • the third communication unit receives the synchronization instruction information sent by the terminal device
  • the synchronization instruction information is used to assist the network device to obtain at least one of the following: the timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the terminal device and the source The network equipment and the TA difference between the terminal equipment and the target network equipment.
  • this embodiment may further include: acquiring the timing advance TA difference between the terminal device and the source network device and between the terminal device and the target network device based on the synchronization indication information.
  • the network device may be the source network device or the target network device; in other words, the terminal device may send the synchronization indication information to the source network device, or may send the synchronization indication information to Target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least a measurement report message.
  • the synchronization indication information includes a measurement report message
  • the measurement configuration sent from the source network device or the target network device on the network side can also be received, and the measurement can be performed based on the measurement configuration; when the measurement result is obtained, the measurement result can be reported To the network side;
  • the network device determines the TA difference between the terminal device and the source network device, and between the terminal device and the target network device according to the measurement result in the measurement report message.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the synchronization indication information further includes at least one of the following: the signal measurement difference between the source network device and the target network device of the terminal device; the distance difference between the terminal device and the source network device and the target network device ; The path loss difference between the terminal device and the source network device and the target network device; the TA value information of the terminal device and the network device; the target network device identification; the candidate target network device identification selected by the terminal device.
  • the synchronization indication information may also include: a list of candidate target cells; the list of candidate target cells includes but is not limited to at least one of the following: cell identifier (cell id), measurement result (Such as RSRP), positioning information, road loss information.
  • cell id cell identifier
  • RSRP measurement result
  • positioning information road loss information.
  • the synchronization indication information includes the measurement difference of the terminal device between the source network device and the target network device (such as RSRP), or the distance difference between the terminal device between the source network device and the target network device (such as obtained according to a positioning reference signal, etc.) ), It can also be recommended TA value information, such as the TA value of the source cell, or various combinations.
  • the terminal device can measure the signal measurement result of the source network device and the signal measurement result of the target network device, and determine the signal measurement difference between the source network device and the target network device of the terminal device based on the two results;
  • the distance difference between the terminal device and the source network device and the target network device can be determined by the physical location of the source network device and the target network device and the physical location of the terminal device; where the way to obtain the physical location of the network device can be the network It is pre-configured on the side, or it can be obtained from the network side, which is not limited here.
  • the physical location of the terminal device can be determined according to the GPS module. Of course, it can also be determined according to the cell where its own period is located, or , The terminal device determines the location information according to the measurement of the positioning reference signal, and does not perform exhaustive exhaustion.
  • the TA value information of the terminal device and the network device may include at least one of the following: the TA value of the source network device, the TA offset value between the source network device and the TA offset value between the target network device, and The TA value of the target network device, the TA adjustment factor of the target network device, and the TA adjustment factor of the source network device.
  • the network device may perform at least one of the following:
  • the TA difference is directly determined
  • the TA value of the source network device and the TA adjustment factor of the target network device determine the TA values of the source network device and the target network device;
  • the TA value of the source network device and the TA adjustment factor of the target network device determine the TA value of the source network device and the target network device, and then determine the TA difference;
  • the TA of the target network device is combined with the TA adjustment factor of the source network device to determine the TA values of the source network device and the target network device;
  • the TA of the target network device is combined with the TA adjustment factor of the source network device to determine the TA values of the source network device and the target network device, thereby determining the TA difference.
  • the synchronization indication information needs to include the target network device identification or the selected candidate target network Equipment Identity.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key; the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service Adaptation), different packet data aggregation protocols (PDCP, Packet Data Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service Adaptation
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • Low layer low layer
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a network device, including: a fourth communication unit that sends synchronization indication information to a terminal device;
  • the synchronization indication information is used to assist the terminal device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the target network device; the TA difference between the terminal device and the source network device, and the terminal device and the target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the synchronization indication information is sent from the source network device to the terminal device, that is, it can be sent to the terminal device by carrying the synchronization indication information in the RRC message.
  • the RRC message includes at least: a reconfiguration message and a handover command. That is to say, if the synchronization indication information can be sent by the network device to the terminal device, the terminal device can be notified in an RRC message.
  • the RRC message includes but is not limited to a reconfiguration message and a handover command.
  • This embodiment may also provide measurement configuration for the terminal device, and of course may not provide measurement configuration for the terminal device.
  • the measurement is performed based on the measurement configuration; the measurement result is obtained, and the measurement result is reported to the network side, which may specifically be the source network device side reported to the network side ; Further, the source network device may determine the TA difference between the terminal device and the source network device, and between the terminal device and the target network device based on the measurement result.
  • the measurement result may include the measurement result of the reference signal of the source network device and the measurement result of the reference signal of at least one target network device.
  • the RRC message can also be a new RRC message. Its composition can be introduced by introducing a new measurement IE in the RRC message.
  • the IE is configured for measurement and is dedicated to synchronization indication information. It can be set according to the actual situation. No more details.
  • the measurement of the reference signal by the terminal device it may be measured for the reference signal sent by the source network device and / or at least one target network device; for example, it may include at least one of the following: cell identification, frequency identification, measurement ID, permission Measurement bandwidth, SSB, CRS (cell-specific reference signal, also called common reference signal), MBSFN-RS, UE-specific RS (mobile station-specific reference signal), PRS and CSI-RS and other reference signals, no longer here Exhaustion.
  • CRS cell-specific reference signal, also called common reference signal
  • MBSFN-RS mobile station-specific reference signal
  • PRS and CSI-RS and other reference signals
  • the fourth communication unit may use a new RRC message or RRC reconfiguration information to instruct the UE to report the TA value at the source base station, or the recommended TA value, or the recommended TA value range.
  • the synchronization indication information further includes at least one of the following:
  • TA value of the terminal device on the target network device side TA offset value of the terminal device on the source network device and the target network device; TA adjustment factor.
  • the terminal device receives the synchronization indication information sent by the network device, which may include the TA value of the terminal device in the target network device; it may be sent to the source network device through the target network device, so that the source network device sends it to the terminal device;
  • the manner in which the target network device obtains the TA value may be in the manner described above, which will not be repeated here.
  • the TA offset value can be the offset time indicated by the TA command; the TA offset value of the target network device can also be sent from the target network device to the source network device, and then the source network device sets the target The TA offset value of the network device and the TA value of the source network device are sent to the terminal device together.
  • the TA adjustment factor may be a value set by the network device side according to actual conditions, and may include: a TA adjustment factor corresponding to the target network device, and / or a TA adjustment factor of the source network device.
  • the TA adjustment factor corresponding to the target network device may be used to calculate the TA value of the target network device based on the TA value of the source network device and the TA adjustment factor of the target network device;
  • the TA adjustment factor of the source network device may be used to calculate the TA value of the source network device based on the TA value of the target network device and the TA adjustment factor of the source network device.
  • the TA value of the source network device * the TA adjustment factor of the target network device the TA value of the target network device; it should be understood that the calculation method of the source network device is similar to it, not Let me repeat them.
  • the method further includes: sending instruction information;
  • the indication information includes at least one of the following: the time boundary between the terminal device and the source network device and the target network device; the time boundary difference between the terminal device and the source network device and the target network device.
  • This embodiment can be applied to a variety of scenarios, and can be different handover scenarios for any terminal device and source network device / target network device TA, such as for a handover that occurs between network devices, or cells within the network device but at different frequency points, Or other network devices that are not synchronized.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device retains the first protocol stack and the first related key with the source network device, and maintains the second protocol stack and the second with the first target network device Related key
  • the first related key is different from the second related key.
  • the first protocol stack and the second protocol stack may be the same or different, or at least partially different, for example, when targeting a 5G system, the terminal device and the source network device, and the terminal device and the first target network device Maintain different service data application protocols (SDAP, Service Adaptation), different packet data aggregation protocols (PDCP, Packet Data Convergence Protocol), different wireless link layer control protocols (RLC, Radio Link Control), different Media access control (MAC) entity, different low layer (Low layer) entities; when targeting 4G systems, different packet data aggregation can be maintained between the terminal device and the source network device, and between the terminal device and the first target network device Protocol (PDCP, Packet Data Convergence Protocol), different radio link layer control protocols (RLC, Radio Link Control), different media access control (MAC) entities, different low layer (Low layer) entities.
  • SDAP Service Adaptation
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media access control
  • Low layer low layer
  • the PDCP of the first protocol stack and the second protocol stack must be different.
  • At least one of SDAP, RLC, MAC and physical layer may be the same or different.
  • the first protocol stack and the second protocol stack may share at least one of SDAP, RLC, MAC, and physical layer, or may have SDAP, RLC, MAC, and physical layer respectively.
  • An embodiment of the present invention provides a network device, including:
  • the fifth communication unit sends synchronization indication information to the terminal device
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the network device may configure at least one candidate target network device for the terminal device to perform measurement; and, the report of the terminal device can be obtained.
  • assisting the network device to obtain the above information may be directly acquiring at least one of the following reported by the terminal device: the timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device ; TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the network device can obtain at least one of the following according to the assistance of the measurement results: the timing advance TA value of the terminal device and the source network device; the terminal device and the candidate target The TA value of the network device; the TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least: a reconfiguration message and a measurement command.
  • the synchronization indication information includes at least one of the following: the identification of the candidate target network device; the measurement object configuration; and the report configuration.
  • the identification of the candidate target network device may be one or more, that is, the network device notifies the identification of all candidate target network devices that need to be measured to the terminal device, which may be all network devices that can be measured by the terminal device At least part of the network equipment.
  • the configuration of the measurement object may include configuring the terminal device to perform RSRP measurement, distance difference, and path loss difference measurement.
  • the reporting configuration may include the reported information format and the reported information content.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the network device may also advance the TA value according to the timing of the terminal device and the source network device; the terminal device and the candidate target network device TA value; at least one piece of information of the TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device to select the target network device for the terminal device, and then execute the handover processing flow shown in FIG. 3 , Will not repeat them here.
  • An embodiment of the present invention provides a terminal device, as shown in FIG. 8 including:
  • the sixth communication unit 81 receives synchronization indication information sent by the network device
  • the synchronization indication information is used to configure the terminal device to measure the candidate target network device to assist the network device to obtain at least one of the following:
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the network device may configure at least one candidate target network device for the terminal device to perform measurement; and, the report of the terminal device can be obtained.
  • assisting the network device to obtain the above information may be directly acquiring at least one of the following reported by the terminal device: the timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device ; TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the network device can obtain at least one of the following according to the assistance of the measurement results: the timing advance TA value of the terminal device and the source network device; the terminal device and the candidate target The TA value of the network device; the TA difference between the terminal device and the source network device and between the terminal device and the candidate target network device.
  • the synchronization indication information may be carried by RRC messages.
  • the RRC message includes at least: a reconfiguration message and a measurement command.
  • the synchronization indication information includes at least one of the following: the identification of the candidate target network device; the measurement object configuration; and the report configuration.
  • the identification of the candidate target network device may be one or more, that is, the network device notifies the identification of all candidate target network devices that need to be measured to the terminal device, which may be all network devices that can be measured by the terminal device At least part of the network equipment.
  • the configuration of the measurement object may include configuring the terminal device to perform RSRP measurement, distance difference, and path loss difference measurement.
  • the reporting configuration may include the reported information format and the reported information content.
  • any terminal device and source network device / target network device TA can be different switching scenarios for any terminal device and source network device / target network device TA, such as switching occurs between network devices, or cells in network devices but at different frequency points , Or other unsynchronized network devices, etc.
  • the terminal device can obtain multiple candidate target network devices (or candidate target cells) during the handover process.
  • the source network device may send the multiple candidate target network devices to the terminal device.
  • the terminal device selects one target network device each time to initiate a handover process, that is, the target network device in this embodiment may be one of at least one candidate target network device.
  • the terminal device after receiving the synchronization indication information sent by the network device, the terminal device further includes:
  • the sixth processing unit 82 measures the candidate target network device based on the synchronization instruction information to obtain a measurement result
  • the timing advance TA value of the terminal device and the source network device The timing advance TA value of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the candidate target network device configured by the network device may be measured according to the identifier of the candidate target network device in the synchronization indication information, and at least one of RSRP, road loss difference, and distance difference may be obtained, and then the terminal device may be determined At least one of the TA value of the timing advance from the source network device; the TA value of the terminal device and the candidate target network device; the TA difference between the terminal device and the source network device, and the terminal device and the candidate target network device.
  • the network device may also advance the TA value according to the timing of the terminal device and the source network device; the TA value of the terminal device and the candidate target network device; the terminal device and At least one of the source network device and the TA difference between the terminal device and the candidate target network device selects the target network device for the terminal device, and then executes the handover processing flow shown in FIG. 3, which will not be repeated here.
  • the foregoing determination of the timing advance TA value of the terminal device and the source network device according to the synchronization instruction information; the TA value of the terminal device and the candidate target network device; the terminal device and the source network device and the terminal device and The manner of at least one of the TA difference of the candidate target network device may be:
  • the TA value corresponding to the source network device is estimated according to the RSRP corresponding to the source network device, and the candidate target network device adopts the same processing method, which is not described in detail; on this basis, the TA difference can be further calculated;
  • At least one TA difference may be estimated based on the at least one distance difference.
  • FIG. 9 is a schematic structural diagram of a communication device 900 provided by an embodiment of the present application.
  • the communication device may be the foregoing terminal device or network device of this embodiment.
  • the communication device 900 shown in FIG. 9 includes a processor 910, and the processor 910 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the communication device 900 may further include a memory 920.
  • the processor 910 can call and run a computer program from the memory 920 to implement the method in the embodiments of the present application.
  • the memory 920 may be a separate device independent of the processor 910, or may be integrated in the processor 910.
  • the communication device 900 may further include a transceiver 930, and the processor 910 may control the transceiver 930 to communicate with other devices, specifically, may send information or data to other devices, or receive other Information or data sent by the device.
  • the transceiver 930 may include a transmitter and a receiver.
  • the transceiver 930 may further include antennas, and the number of antennas may be one or more.
  • the communication device 900 may specifically be a network device according to an embodiment of the present application, and the communication device 900 may implement the corresponding process implemented by the network device in each method of the embodiment of the present application. .
  • the communication device 900 may specifically be a terminal device or a network device according to an embodiment of the present application, and the communication device 900 may implement the corresponding process implemented by the mobile terminal / terminal device in each method of the embodiment of the present application. It is concise and will not be repeated here.
  • FIG. 8 is a schematic structural diagram of a chip according to an embodiment of the present application.
  • the chip 800 shown in FIG. 8 includes a processor 810, and the processor 810 can call and run a computer program from the memory to implement the method in the embodiment of the present application.
  • the chip 1000 may further include a memory 1020.
  • the processor 1010 can call and run a computer program from the memory 1020 to implement the method in the embodiments of the present application.
  • the memory 1020 may be a separate device independent of the processor 1010, or may be integrated in the processor 1010.
  • the chip 1000 may further include an input interface 1030.
  • the processor 1010 can control the input interface 1030 to communicate with other devices or chips. Specifically, it can obtain information or data sent by other devices or chips.
  • the chip 1000 may further include an output interface 1040.
  • the processor 1010 can control the output interface 1040 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 process implemented by the network device in each method of the embodiment of the present application.
  • the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding process implemented by the terminal device in each method of the embodiments of the present application.
  • chips mentioned in the embodiments of the present application may also be referred to as system-level chips, system chips, chip systems, or system-on-chip chips.
  • FIG. 11 is a schematic block diagram of a communication system 1100 provided by an embodiment of the present application.
  • the communication system 1100 includes a terminal device 1110 and a network device 1120.
  • the terminal device 1110 can be used to implement the corresponding functions implemented by the terminal device in the above method
  • the network device 1120 can be used to implement the corresponding functions implemented by the network device in the above method. .
  • the processor in the embodiment of the present application may be an integrated circuit chip, which has signal processing capabilities.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an existing programmable gate array (Field Programmable Gate Array, FPGA), or other available Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronic Erasable programmable read only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM DDR SDRAM
  • enhanced SDRAM ESDRAM
  • Synchlink DRAM SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data) 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.
  • static random access memory static random access memory
  • DRAM dynamic random access memory
  • SDRAM Synchronous dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • synchronous connection Dynamic random access memory switch link DRAM, SLDRAM
  • Direct Rambus RAM Direct Rambus RAM
  • Embodiments of the present application also provide a computer-readable storage medium for storing computer programs.
  • the computer-readable storage medium may be applied to the network device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiments of the present application.
  • the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiments of the present application.
  • the computer-readable storage medium can be applied to the terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal / terminal device in each method of the embodiments of the present application, for simplicity And will not be repeated here.
  • An embodiment of the present application also provides a computer program product, including computer program instructions.
  • the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. Repeat again.
  • the computer program product can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding process implemented by the mobile terminal / terminal device in each method of the embodiments of the present application, For brevity, I will not repeat them here.
  • the embodiment of the present application also provides a computer program.
  • the computer program can be applied to the network device in the embodiments of the present application.
  • the computer program runs on the computer, the computer is allowed to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. And will not be repeated here.
  • the computer program can be applied to the mobile terminal / terminal device in the embodiments of the present application, and when the computer program runs on the computer, the computer is implemented by the mobile terminal / terminal device in performing various methods of the embodiments of the present application For the sake of brevity, I will not repeat them here.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a division of logical functions.
  • there may be other divisions for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

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Abstract

本发明公开了一种同步指示方法、终端设备、网络设备、芯片、计算机可读存储介质、计算机程序产品以及计算机程序，包括：接收源网络设备发来的同步指示信息；其中，所述同步指示信息用于辅助终端设备获取以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。

Description

一种同步指示方法、终端设备及网络设备 技术领域
本发明涉及信息处理技术领域，尤其涉及一种同步指示方法、终端设备、网络设备、芯片、计算机可读存储介质、计算机程序产品以及计算机程序。
背景技术
在移动通信处理的切换流程中，当用户收到RRC配置消息后，即会按照切换配置，重配置PDCP/RLC/MAC/低层等为对应目标网络设备的栈(stack)；同时，停止在源网络设备的上行(UL)/下行(DL)数据收发。但是，在进行不同网络设备之间或者不同频率之间，比如inter-eNB、inter-freq终端设备，进行切换的场景中，终端设备与网络设备之间可能TA差不同，因此，需要如何针对同步进行处理是需要解决的问题。
发明内容
为解决上述技术问题，本发明实施例提供了一种同步指示方法、终端设备、网络设备、芯片、计算机可读存储介质、计算机程序产品以及计算机程序。
第一方面，本发明实施例提供了一种同步指示方法，应用于终端设备，包括：
接收源网络设备发来的同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第二方面，本发明实施例提供了一种同步指示方法，应用于终端设备，包括：
向网络设备发送同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第三方面，本发明实施例提供了一种同步指示方法，应用于网络设备，包括：
接收终端设备发来的同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第四方面，本发明实施例提供了一种同步指示方法，应用于网络设备，包括：
向终端设备发送同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第五方面，本发明实施例提供了一种同步指示方法，应用于网络设备，包括：
向终端设备发送同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
第六方面，本发明实施例提供了一种同步指示方法，应用于终端设备，包括：
接收网络设备发送的同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
第七方面，本发明实施例提供了一种终端设备，包括：
第一通信单元，接收源网络设备发来的同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第八方面，本发明实施例提供了一种终端设备，包括：
第二通信单元，向网络设备发送同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第就方面，本发明实施例提供了一种网络设备，包括：
第三通信单元，接收终端设备发来的同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第十方面，本发明实施例提供了一种网络设备，包括：
第四通信单元，向终端设备发送同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
第十一方面，本发明实施例提供了一种网络设备，包括：
第五通信单元，向终端设备发送同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
第十二方面，本发明实施例提供了一种终端设备，包括：
第六通信单元，接收网络设备发送的同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
第十三方面，本发明实施例提供了一种终端设备，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，执行上述第一方面、第二方面、第六方面或其各实现方式中的方法。
第十四方面，提供了一种网络设备，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，执行上述第三方面至第五方面或其各实现方式中的方法。
第十五方面，提供了一种芯片，用于实现上述第一方面至第六方面中的任一方面或其各实现方式中的方法。
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如上述第一方面至第六方面中的任一方面或其各实现方式中的方法。
第十六方面，提供了一种计算机可读存储介质，用于存储计算机程序，该计算机程序使得计算机执行上述第一方面至第二方面中的任一方面或其各实现方式中的方法。
第九方面，提供了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第一方面至第六方面中的任一方面或其各实现方式中的方法。
第十七方面，提供了一种计算机程序，当其在计算机上运行时，使得计算机执行上述第一方面至第六方面中的任一方面或其各实现方式中的方法。
本发明实施例的技术方案，获取到同步指示信息，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
附图说明
图1是本申请实施例提供的一种通信系统架构的示意性图一；
图2是本申请实施例提供的一种同步指示方法流程示意图一；
图3为本发明实施例提供的一种切换处理场景示意图；
图4是本申请实施例提供的一种同步指示方法流程示意图二；
图5是本申请实施例提供的一种同步指示方法流程示意图三；
图6是本申请实施例提供的一种同步指示方法流程示意图四；
图7是本申请实施例提供的一种终端设备组成结构示意图；
图8为本发明实施例提供的一种网络设备组成结构示意图；
图9为本发明实施例提供的一种通信设备组成结构示意图；
图10是本申请实施例提供的一种芯片的示意性框图。
图11是本申请实施例提供的一种通信系统架构的示意性图二。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请实施例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、LTE频分双工(Freq终端设备ncy Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统或5G系统等。
示例性的，本申请实施例应用的通信系统100可以如图1所示。该通信系统100可以包括网络设备110，网络设备110可以是与终端设备120(或称为通信终端、终端)通信的设备。网络设备110可以为特定的地理区域提供通信覆盖，并且可以与位于该覆盖区域内的终端设备进行通信。可选地，该网络设备110可以是GSM系统或CDMA系统中的网络设备(Base Transceiver Station，BTS)，也 可以是WCDMA系统中的网络设备(NodeB，NB)，还可以是LTE系统中的演进型网络设备(Evolutional Node B，eNB或网络设备)，或者是云无线接入网络(Cloud Radio Access Network，CRAN)中的无线控制器，或者该网络设备可以为移动交换中心、中继站、接入点、车载设备、可穿戴设备、集线器、交换机、网桥、路由器、5G网络中的网络侧设备或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)中的网络设备等。
该通信系统100还包括位于网络设备110覆盖范围内的至少一个终端设备120。作为在此使用的“终端设备”包括但不限于经由有线线路连接，如经由公共交换电话网络(Public Switched Telephone Networks，PSTN)、数字终端设备线路(Digital Subscriber Line，DSL)、数字电缆、直接电缆连接；和/或另一数据连接/网络；和/或经由无线接口，如，针对蜂窝网络、无线局域网(Wireless Local Area Network，WLAN)、诸如DVB-H网络的数字电视网络、卫星网络、AM-FM广播发送器；和/或另一终端设备的被设置成接收/发送通信信号的装置；和/或物联网(Internet of Things，IoT)设备。被设置成通过无线接口通信的终端设备可以被称为“无线通信终端”、“无线终端”或“移动终端”。移动终端的示例包括但不限于卫星或蜂窝电话；可以组合蜂窝无线电电话与数据处理、传真以及数据通信能力的个人通信系统(Personal Communications System，PCS)终端；可以包括无线电电话、寻呼机、因特网/内联网接入、Web浏览器、记事簿、日历以及/或全球定位系统(Global Positioning System，GPS)接收器的PDA；以及常规膝上型和/或掌上型接收器或包括无线电电话收发器的其它电子装置。终端设备可以指接入终端、终端设备设备(User Equipment，终端设备)、终端设备单元、终端设备站、移动站、移动台、远方站、远程终端、移动设备、终端设备终端、终端、无线通信设备、终端设备代理或终端设备装置。接入终端可以是蜂窝电话、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)、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、5G网络中的终端设备或者未来演进的PLMN中的终端设备等。
可选地，终端设备120之间可以进行终端直连(Device to Device，D2D)通信。
可选地，5G系统或5G网络还可以称为新无线(New Radio，NR)系统或NR网络。
图1示例性地示出了一个网络设备和两个终端设备，可选地，该通信系统100可以包括多个网络设备并且每个网络设备的覆盖范围内可以包括其它数量的终端设备，本申请实施例对此不做限定。
可选地，该通信系统100还可以包括网络控制器、移动管理实体等其他网络实体，本申请实施例对此不作限定。
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100为例，通信设备可包括具有通信功能的网络设备110和终端设备120，网络设备110和终端设备120可以为上文所述的具体设备，此处不再赘述；通信设备还可包括通信系统100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。
为了能够更加详尽地了解本发明实施例的特点与技术内容，下面结合附图对本发明实施例的实现进行详细阐述，所附附图仅供参考说明之用，并非用来限定本发明实施例。
实施例一、
本发明实施例提供了一种同步指示方法，应用于终端设备，如图2所示，包括：
步骤201：接收源网络设备发来的同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前(TA，timing advance)值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
关于终端设备接收的同步指示信息，可以由RRC消息承载。本实施例中，同步指示信息由源网络设备发送给终端设备，也就是可以通过在RRC消息中携带该同步指示信息发送至终端设备。
其中，所述RRC消息至少包括：重配置消息，切换命令。也就是说，若同步指示信息可以由网络设备发送给终端设备，则可以在RRC消息即重配置消息，切换命令中发送给终端设备。
本实施例还可以为终端设备提供测量配置，当然还可以不为终端设备提供测量配置。相应的，当为终端设备提供测量配置的情况下，所述方法还包括：基于所述测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧，具体的可以为为上报至网络侧的源网络设备侧；进而，源网络设备可以基于所述测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
需要指出的是，RRC消息还可以为新的RRC消息，其构成可以通过在RRC消息中引入新的测量IE，该IE配置测量，并专用于同步指示信息，具体可以根据实际情况进行设置，这里不再进行赘述。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
另外，网络侧可以采用新的RRC消息或RRC重配置信息，指示UE上报在源基站的TA值，或者推荐的TA值，或者推荐的TA值范围。
关于切换的处理流程可以参见图3所示，包括：切换准备阶段，包含图中步骤1-6：源网络设备向终端设备发送测量控制，可包含同步指示信息；终端设备进行针对多个网络设备或小区的测量之后，向源网络设备发送测量报告；源网络设备根据测量报告(或者结合RRM信息)进行切换决策；源网络设备向目标网络设备发送切换请求以使得目标网络设备准备进行切换；目标网络设备根据切换请求进行切换许可控制；目标网络设备确定进行切换时，向源网络设备发送切换请求确认。
然后进行执行切换阶段，包含图中步骤7-11，具体的：目标网络设备生成RRC信息，将RRC连接重配置信息发送至源网络设备，由源网络设备通过RRC连接重配置信息发送至终端设备；终端设备接收到RRC连接重配置信息后，根据连接重配置信息获取同步指示信息，执行切换处理；然后源网络设备发送SN状态传输至目标网络设备；终端设备与目标网络设备进行同步，然后接收目标网络设备进行UL分配，向目标网络设备发送RRC连接重配置完成信息。
最后进入切换完成阶段，包含图中12-18，具体的：目标网络设备向MME发送路径切换请求，以通知MME终端设备改变小区；MME向服务网关发送调整承载请求，由MME进行切换下行路径处理；服务网关完成处理后，向MME发送承载调整完成处理，并由MME向目标网络设备发送路径切换请求的确认消息；目标网络设备向源网络设备通知终端设备上下文释放由源网络设备释放资源。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：
终端设备在目标网络设备侧的TA值；终端设备在源网络设备以及目标网络设备的TA偏移值；TA调整因子。
终端设备接收到网络设备发来的同步指示信息中，可以包括有终端设备在目标网络设备的TA值；可以为通过目标网络设备发送给源网络设备，从而由源网络设备发送给终端设备；关于目标网络设备获取TA值的方式，可以通过上述描述的方式，这里不再赘述。
同步指示信息中，TA偏移值，即TA offset，可以为TA命令指示的偏移时间；目标网络设备的TA偏移值也可以由目标网络设备发送至源网络设备，然后源网络设备将目标网络设备的TA偏移值以及源网络设备的TA值共同发送给终端设备。
所述TA调整因子，可以为网络设备侧根据实际情况设置的值，可以包括有：目标网络设备对应的TA调整因子，和/或，源网络设备的TA调整因子。其中，所述目标网络设备对应的TA调整因子，可以用于基于源网络设备的TA值、以及目标网络设备的TA调整因子，计算得到目标网络设备的TA值；
另外，源网络设备的TA调整因子，可以用于基于目标网络设备的TA值、以及源网络设备的TA调整因子，计算得到源网络设备的TA值。
以目标网络设备的TA调整因子为例进行说明，源网络设备的TA值*目标网络设备的TA调整因子＝目标网络设备的TA值；需要理解的是，源网络设备的计算方式与其类似，不再进行赘述。
其中，所述方法还包括：
接收源网络设备发来的指示信息；
其中，所述指示信息包括以下至少之一：
终端设备与源网络设备和目标网络设备之间的时间边界；
终端设备与源网络设备和目标网络设备之间的时间边界差。相应的，所述接收源网络设备发来的同步指示信息之后，所述方法还包括：
基于所述指示信息和/或所述同步指示信息，确定以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
具体来说，可以基于所述指示信息和/或所述同步指示信息，确定所述终端设备与目标网络设备的TA值。
在此基础上，还可以基于终端设备与源网络设备之间的TA值以及终端设备与目标网络设备的TA值，确定得到终端设备与源网络设备以及目标网络设备之间的TA差。
进一步地，确定TA差时，一种方式可以采用指示信息来确定，比如，可以为基于终端设备与源网络设备的时间边界、以及终端设备与目标网络设备的时间边界之间的差值，估计得到终端设备与源网络设备以及目标网络设备之间的TA差。其中，终端设备和网络设备之间的时间边界可以理解为无线帧的起始点。
再比如，可以基于终端设备与源网络设备、以及终端设备与目标网络设备之间的时间边界差，确定得到终端设备与源网络设备以及目标网络设备之间的TA差。
这种方式可以主要应用于下行同步中。
或者，另一种方式可以为直接根据同步指示信息确定TA差，比如，可以包括以下至少之一：
获取到终端设备在目标网络设备的TA值，然后根据自身检测得到的终端设备与源网络设备之间的TA值；进而还可以计算得到两者之间的TA差；
根据终端设备在源网络设备的TA偏移值、以及终端设备在目标网络设备的TA偏移值，计算两者的差作为TA差；
基于目标网络设备对应的TA调整因子计算得到目标网络设备的TA值，结合目标网络设备的TA以及源网络设备的TA值确定两者的TA差；和/或，基于源网络设备的TA调整因子确定源网络设备的TA值，结合源网络设备的TA值以及目标网络设备的TA值，确定两者的TA差。
再一种方式，即结合同步指示信息以及所述指示信息共同确定TA差，可以将前述两种处理结 合使用；比如，可以包括：
可以为基于终端设备与源网络设备的时间边界、以及终端设备与目标网络设备的时间边界，结合同步指示信息中终端设备在目标网络设备的TA值，然后根据自身检测得到的终端设备与源网络设备之间的TA值，还可以计算得到两者之间的TA差。
或者，还可以基于终端设备与源网络设备、以及终端设备与目标网络设备之间的时间边界差，结合基于目标网络设备对应的TA调整因子计算得到目标网络设备的TA值，结合目标网络设备的TA以及源网络设备的TA值确定两者的TA差；和/或，基于源网络设备的TA调整因子确定源网络设备的TA值，结合源网络设备的TA值以及目标网络设备的TA值，确定两者的TA差。
当然，还可以存在其他的结合方式，这里不再进行穷举。并且，还可以理解的是，前述确定TA值之后，可以进一步确定TA差，也可以不再计算TA差仅获取TA值，具体实施可以根据实际情况来设置，本实施例中不做限定。
另外，还需要说明的是，所述定时提前(TA，timing advance)可以用于上行传输，指为了将上行包在希望的时间到达网络设备，预估由于距离引起的射频传输时延，提前相应时间发出数据包。为了保证网络设备侧的时间同步，LTE提出了上行定时提前(Uplink Timing Advance)的机制。在终端设备侧看来，TA本质上是接收到下行子帧的起始时间与传输上行子帧的时间之间的一个负偏移(negative offset)。网络设备通过适当地控制每个终端设备的偏移，可以控制来自不同终端设备的上行信号到达网络设备的时间。对于离网络设备较远的终端设备，由于有较大的传输延迟，就要比离网络设备较近的终端设备提前发送上行数据。关于针对上行传输中获取TA的方式，可以由网络设备通过测量终端设备的上行传输来确定每个终端设备的TA值；可以理解为，只要终端设备有上行传输，网络设备就可以用来估计TA值。
本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；
所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例二、
本发明实施例提供了一种同步指示方法，应用于终端设备，如图4所示，包括：
步骤401：向网络设备发送同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
需要指出的是，本实施例中，网络设备可以为源网络设备，也可以为目标网络设备；换句话说，终端设备可以将同步指示信息发送给源网络设备，也可以将同步指示信息发送给目标网络设备。
关于同步指示信息，可以由RRC消息承载。其中，所述RRC消息至少包含测量上报消息。
需要理解的是，当同步指示信息中包含测量上报消息时，还可以接收网络侧源网络设备或目标网络设备发来的测量配置，基于测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧；
相应的，可以为源网络设备或目标网络设备根据测量上报消息中的测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
关于切换的处理流程可以参见图3所示，包括：切换准备阶段，包含图中步骤1-6：源网络设备向终端设备发送测量控制；终端设备进行针对多个网络设备或小区的测量之后，向源网络设备发送测量报告，可以包含同步指示信息；源网络设备根据测量报告(或者结合RRM信息)进行切换决策；源网络设备向目标网络设备发送切换请求以使得目标网络设备准备进行切换；目标网络设备根据切换请求进行切换许可控制；目标网络设备确定进行切换时，向源网络设备发送切换请求确认。
然后进行执行切换阶段，包含图中步骤7-11，具体的：目标网络设备生成RRC信息，将RRC连接重配置信息发送至源网络设备，由源网络设备通过RRC连接重配置信息发送至终端设备；终端设备接收到RRC连接重配置信息后，根据连接重配置信息获取同步指示信息，执行切换处理；然后源网络设备发送SN状态传输至目标网络设备；终端设备与目标网络设备进行同步，然后接收目标网络设备进行UL分配，向目标网络设备发送RRC连接重配置完成信息。
最后进入切换完成阶段，包含图中12-18，具体的：目标网络设备向MME发送路径切换请求，以通知MME终端设备改变小区；MME向服务网关发送调整承载请求，由MME进行切换下行路径处理；服务网关完成处理后，向MME发送承载调整完成处理，并由MME向目标网络设备发送路径切换请求的确认消息；目标网络设备向源网络设备通知终端设备上下文释放由源网络设备释放资源。
另外，还需要说明的是，所述定时提前(TA，timing advance)可以用于上行传输，指为了将上行包在希望的时间到达网络设备，预估由于距离引起的射频传输时延，提前相应时间发出数据包。为了保证网络设备侧的时间同步，LTE提出了上行定时提前(Uplink Timing Advance)的机制。在终端设备侧看来，TA本质上是接收到下行子帧的起始时间与传输上行子帧的时间之间的一个负偏移(negative offset)。网络设备通过适当地控制每个终端设备的偏移，可以控制来自不同终端设备的上行信号到达网络设备的时间。对于离网络设备较远的终端设备，由于有较大的传输延迟，就要比离网络设备较近的终端设备提前发送上行数据。关于针对上行传输中获取TA的方式，可以由网络设备通过测量终端设备的上行传输来确定每个终端设备的TA值；可以理解为，只要终端设备有上行传输，网络设备就可以用来估计TA值。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：
终端设备在源网络设备和目标网络设备的信号测量差；终端设备与源网络设备和目标网络设备之间的距离差；终端设备与源网络设备和目标网络设备之间的路损差；终端设备与网络设备的TA值信息；目标网络设备标识；终端设备选取的候选目标网络设备标识。
另外，所述同步指示信息中，除上述信息之外，还可以包括：候选目标小区列表；所述候选目标小区列表中，包括但不限于以下至少之一：小区标识(cell id)，测量结果(如RSRP)，定位信息，路损信息。
具体的，同步指示信息中，包括终端设备在源网络设备和目标网络设备的测量差(如RSRP)，也可以是终端设备在源网络设备和目标网络设备距离差(如根据定位参考信号等获取)，也可是推荐的TA值信息，如与源小区的TA值，或者各种的结合。
终端设备可以测量得到源网络设备的信号测量结果，并且得到目标网络设备的信号测量结果，基于两个结果确定终端设备在源网络设备和目标网络设备的信号测量差；
关于终端设备与源网络设备以及目标网络设备之间的距离差可以通过源网络设备以及目标网络设备的物理位置以及终端设备的物理位置来确定；其中，获取网络设备的物理位置的方式可以为网络侧预配置的，或者还可以为向网络侧请求获取的，这里不进行限定，终端设备自身的物理位置的确定方式可以为根据GPS模块来确定当然还可以根据自身所处小区来确定，或者，终端设备根据定位参考信号测量确定位置信息，不进行穷举。
终端设备与网络设备的TA值信息中，可以包括有以下至少之一：源网络设备的TA值，与源网络设备间的TA偏移值offset，与目标网络设备间的TA偏移值，与目标网络设备的TA值，与目标网络设备的TA调整因子，与源网络设备的TA调整因子。
另外，当终端设备预先获取网络侧配置的至少一个候选目标网络设备的相关信息时，可以在切换失败或者进行切换的时候，直接通知网络侧当前选取的目标网络设备的标识信息。此时，可以为终端设备选定的要切换的目标网络设备的标识；当然，还可以为终端设备选取了几个通信质量较好的候选目标网络设备，将候选目标网络设备的标识发送给源网络设备，由源网络设备为其选取目标网络设备。其中，通信质量较好可以通过针对参考信号的测量结果来确定，比如，可以为信噪比大于预设信噪比门限值的，或者是信噪比排序靠前的N个(N大于等于1且小于等于全部候选网络设备的数量)。当然还可以采用其他参数来衡量通信质量的好坏，比如，可以为信号强度、噪声强度，也可以这些参数结合使用，这里不再穷举，并且需要理解的是，选取的方式与前述基于信噪比进行选取的方式类似，不再赘述。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；
所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例三、
本发明实施例提供了一种同步指示方法，应用于网络设备，如图5所示，包括：
步骤501：接收终端设备发来的同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
进一步地，本实施例还可以包括：基于所述同步指示信息，获取所述终端设备与源网络设备以及所述终端设备与目标网络设备之间的定时提前TA差。
需要指出的是，本实施例中，网络设备可以为源网络设备，也可以为目标网络设备；换句话说，终端设备可以将同步指示信息发送给源网络设备，也可以将同步指示信息发送给目标网络设备。
关于同步指示信息，可以由RRC消息承载。其中，所述RRC消息至少包含测量上报消息。
需要理解的是，当同步指示信息中包含测量上报消息时，还可以接收网络侧源网络设备或目标网络设备发来的测量配置，基于测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧；
相应的，网络设备，比如源网络设备或目标网络设备，根据测量上报消息中的测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
另外，还需要说明的是，所述定时提前(TA，timing advance)可以用于上行传输，指为了将上行包在希望的时间到达网络设备，预估由于距离引起的射频传输时延，提前相应时间发出数据包。为了保证网络设备侧的时间同步，LTE提出了上行定时提前(Uplink Timing Advance)的机制。在终端设备侧看来，TA本质上是接收到下行子帧的起始时间与传输上行子帧的时间之间的一个负偏移(negative offset)。网络设备通过适当地控制每个终端设备的偏移，可以控制来自不同终端设备的上行信号到达网络设备的时间。对于离网络设备较远的终端设备，由于有较大的传输延迟，就要比离网络设备较近的终端设备提前发送上行数据。关于针对上行传输中获取TA的方式，可以由网络设备通过测量终端设备的上行传输来确定每个终端设备的TA值；可以理解为，只要终端设备有上行传输，网络设备就可以用来估计TA值。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：
终端设备在源网络设备和目标网络设备的信号测量差；终端设备与源网络设备和目标网络设备之间的距离差；终端设备与源网络设备和目标网络设备之间的路损差；终端设备与网络设备的TA值信息；目标网络设备标识；终端设备选取的候选目标网络设备标识。
另外，所述同步指示信息中，除上述信息之外，还可以包括：候选目标小区列表；所述候选目标小区列表中，包括但不限于以下至少之一：小区标识(cell id)，测量结果(如RSRP)，定位信息，路损信息。
具体的，同步指示信息中，包括终端设备在源网络设备和目标网络设备的测量差(如RSRP)，也可以是终端设备在源网络设备和目标网络设备距离差(如根据定位参考信号等获取)，也可是推荐的TA值信息，如与源小区的TA值，或者各种的结合。
终端设备可以测量得到源网络设备的信号测量结果，并且得到目标网络设备的信号测量结果，基于两个结果确定终端设备在源网络设备和目标网络设备的信号测量差；
关于终端设备与源网络设备以及目标网络设备之间的距离差可以通过源网络设备以及目标网络设备的物理位置以及终端设备的物理位置来确定；其中，获取网络设备的物理位置的方式可以为网络侧预配置的，或者还可以为向网络侧请求获取的，这里不进行限定，终端设备自身的物理位置的确定方式可以为根据GPS模块来确定当然还可以根据自身档期所处小区来确定，或者，终端设备根据定位参考信号测量确定位置信息，不进行穷举。
终端设备与网络设备的TA值信息中，可以包括有以下至少之一：源网络设备的TA值，与源网络设备间的TA偏移值offset，与目标网络设备间的TA偏移值，与目标网络设备的TA值，与目标 网络设备的TA调整因子，与源网络设备的TA调整因子。
网络设备在接收到同步指示信息之后，可以执行以下至少之一：
基于终端设备在源网络设备的信号测量值、以及终端与目标网络设备的信号测量值确定信号测量差；进而确定终端设备在源网络设备以及终端设备在目标网络设备的TA差；
基于终端设备与源网络设备以及目标网络设备之间的距离差，直接确定TA差；
源网络设备的TA值并结合目标网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值；
源网络设备的TA值并结合目标网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值，进而确定TA差；
目标网络设备的TA至并结合源网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值；
目标网络设备的TA至并结合源网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值，进而确定TA差。
当然对应不同的TA值信息可以存在不同的结合方式进行处理得到TA差，这里不再进行穷举。还需要指出的是，当终端设备存在多个候选目标网络设备时，并且向其中一个目标网络设备发起切换流程的时候，在同步指示信息中，需要包含有目标网络设备标识或者选取的候选目标网络设备标识。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；
所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例四、
本发明实施例提供了一种同步指示方法，应用于网络设备，如图6所示，包括：
步骤601：向终端设备发送同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
同步指示信息，可以由RRC消息承载。本实施例中，同步指示信息由源网络设备发送给终端设备，也就是可以通过在RRC消息中携带该同步指示信息发送至终端设备。
其中，所述RRC消息至少包括：重配置消息，切换命令。也就是说，若同步指示信息可以由网络设备发送给终端设备，则可以在RRC消息中通知终端设备，RRC消息包括但不限于重配置消息，切换命令。
本实施例还可以为终端设备提供测量配置，当然还可以不为终端设备提供测量配置。相应的，当为终端设备提供测量配置的情况下，基于所述测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧，具体的可以为为上报至网络侧的源网络设备侧；进而，源网络设备可以基于所述测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
需要指出的是，RRC消息还可以为新的RRC消息，其构成可以通过在RRC消息中引入新的测量IE，该IE配置测量，并专用于同步指示信息，具体可以根据实际情况进行设置，这里不再进行赘述。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的 测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
另外，网络侧的网络设备可以采用新的RRC消息或RRC重配置信息，指示UE上报在源基站的TA值，或者推荐的TA值，或者推荐的TA值范围。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：
终端设备在目标网络设备侧的TA值；终端设备在源网络设备以及目标网络设备的TA偏移值；TA调整因子。
终端设备接收到网络设备发来的同步指示信息中，可以包括有终端设备在目标网络设备的TA值；可以为通过目标网络设备发送给源网络设备，从而由源网络设备发送给终端设备；关于目标网络设备获取TA值的方式，可以通过上述描述的方式，这里不再赘述。
同步指示信息中，TA偏移值，即TA offset，可以为TA命令指示的偏移时间；目标网络设备的TA偏移值也可以由目标网络设备发送至源网络设备，然后源网络设备将目标网络设备的TA偏移值以及源网络设备的TA值共同发送给终端设备。
所述TA调整因子，可以为网络设备侧根据实际情况设置的值，可以包括有：目标网络设备对应的TA调整因子，和/或，源网络设备的TA调整因子。其中，所述目标网络设备对应的TA调整因子，可以用于基于源网络设备的TA值、以及目标网络设备的TA调整因子，计算得到目标网络设备的TA值；
另外，源网络设备的TA调整因子，可以用于基于目标网络设备的TA值、以及源网络设备的TA调整因子，计算得到源网络设备的TA值。
以目标网络设备的TA调整因子为例进行说明，源网络设备的TA值*目标网络设备的TA调整因子＝目标网络设备的TA值；需要理解的是，源网络设备的计算方式与其类似，不再进行赘述。
相应的，所述方法还包括：发送指示信息；
其中，所述指示信息包括以下至少之一：终端设备与源网络设备和目标网络设备之间的时间边界；终端设备与源网络设备和目标网络设备之间的时间边界差。
本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；
所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例五、
本发明实施例提供了一种同步指示方法，应用于网络设备，包括：
向终端设备发送同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
本实施例与前述实施例不同之处在于，本实施例中网络设备可以为终端设备配置至少一个候选目标网络设备进行测量；并且，能够获取到终端设备的上报。
本实施例中辅助网络设备获取上述信息，可以为直接获取终端设备上报的以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
当然，还可以为获取终端设备上报的一些测量结果，根据测量结果的辅助使得网络设备能获取以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
同步指示信息，可以由RRC消息承载。所述RRC消息至少包括：重配置消息，测量命令。
所述同步指示信息中，包括以下至少之一：候选目标网络设备的标识；测量对象配置；上报配置。
其中，所述候选目标网络设备的标识可以为一个或多个，也就是网络设备将需要测量的全部候选目标网络设备的标识均通知给终端设备，可以为终端设备能够测量到的所有网络设备中的至少部分网络设备。
所述测量对象配置，可以包括有配置终端设备进行RSRP的测量、距离差、路损差的测量等等。
所述上报配置，可以包括有上报的信息格式，以及上报的信息内容等。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还需要说明的是，本实施例中，网络设备接收到终端设备上报的上述信息之后，还可以根据所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中至少之一信息，来为终端设备选取目标网络设备，进而执行切换处理流程，这里不再进行赘述。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例六、
本发明实施例提供了一种同步指示方法，应用于终端设备，包括：
接收网络设备发送的同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
本实施例与前述实施例不同之处在于，本实施例中网络设备可以为终端设备配置至少一个候选目标网络设备进行测量；并且，能够获取到终端设备的上报。
本实施例中辅助网络设备获取上述信息，可以为直接获取终端设备上报的以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
当然，还可以为获取终端设备上报的一些测量结果，根据测量结果的辅助使得网络设备能获取以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
同步指示信息，可以由RRC消息承载。所述RRC消息至少包括：重配置消息，测量命令。
所述同步指示信息中，包括以下至少之一：候选目标网络设备的标识；测量对象配置；上报配置。
其中，所述候选目标网络设备的标识可以为一个或多个，也就是网络设备将需要测量的全部候选目标网络设备的标识均通知给终端设备，可以为终端设备能够测量到的所有网络设备中的至少部分网络设备。
所述测量对象配置，可以包括有配置终端设备进行RSRP的测量、距离差、路损差的测量等等。
所述上报配置，可以包括有上报的信息格式，以及上报的信息内容等。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还需要说明的是，本实施例中，所述接收网络设备发送的同步指示信息之后，所述方法还包括：
基于所述同步指示信息对候选目标网络设备进行测量，得到测量结果；
基于测量结果，确定以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
比如，可以为根据同步指示信息中的候选目标网络设备的标识对网络设备配置的候选目标网络设备进行测量，并得到RSRP、路损差、距离差中的至少之一，进而确定所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中的至少之一。
相应的，网络设备接收到终端设备上报的上述信息之后，还可以根据所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及 所述终端设备与候选目标网络设备的TA差中至少之一信息，来为终端设备选取目标网络设备，进而执行图3中所示的切换处理流程，这里不再进行赘述。
进一步地，前述根据同步指示信息确定所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中的至少之一的方式，可以为：
根据源网络设备对应的RSRP估计得到与源网络设备的TA值，候选目标网络设备采用同样的处理方法不再赘述；在此基础上，可以进一步计算得到TA差；
或者，根据终端设备与源网络设备的距离、终端设备与至少一个候选目标网络设备的距离，计算得到终端设备与源网络设备、以及终端设备与至少一个候选目标网络设备之间的至少一个距离差，可以基于所述至少一个距离差，估算得到至少一个TA差。
需要理解的是，前述仅为确定TA值或TA差的示例性描述，实际上可以存在其他的处理方式，只是这里不再进行穷举。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例七、
本发明实施例提供了一种终端设备，如图7所示，包括：
第一通信单元71，接收源网络设备发来的同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前(TA，timing advance)值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
关于终端设备接收的同步指示信息，可以由RRC消息承载。本实施例中，同步指示信息由源网络设备发送给终端设备，也就是可以通过在RRC消息中携带该同步指示信息发送至终端设备。
其中，所述RRC消息至少包括：重配置消息，切换命令。也就是说，若同步指示信息可以由网络设备发送给终端设备，则可以在RRC消息即重配置消息，切换命令中发送给终端设备。
本实施例还可以为终端设备提供测量配置，当然还可以不为终端设备提供测量配置。相应的，当为终端设备提供测量配置的情况下，所述方法还包括：基于所述测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧，具体的可以为为上报至网络侧的源网络设备侧；进而，源网络设备可以基于所述测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
需要指出的是，RRC消息还可以为新的RRC消息，其构成可以通过在RRC消息中引入新的测量IE，该IE配置测量，并专用于同步指示信息，具体可以根据实际情况进行设置，这里不再进行赘述。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
另外，网络侧可以采用新的RRC消息或RRC重配置信息，指示UE上报在源基站的TA值，或者推荐的TA值，或者推荐的TA值范围。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：
终端设备在目标网络设备侧的TA值；终端设备在源网络设备以及目标网络设备的TA偏移值；TA调整因子。
终端设备接收到网络设备发来的同步指示信息中，可以包括有终端设备在目标网络设备的TA值；可以为通过目标网络设备发送给源网络设备，从而由源网络设备发送给终端设备；关于目标网络设备获取TA值的方式，可以通过上述描述的方式，这里不再赘述。
同步指示信息中，TA偏移值，即TA offset，可以为TA命令指示的偏移时间；目标网络设备的TA偏移值也可以由目标网络设备发送至源网络设备，然后源网络设备将目标网络设备的TA偏移值以及源网络设备的TA值共同发送给终端设备。
所述TA调整因子，可以为网络设备侧根据实际情况设置的值，可以包括有：目标网络设备对应的TA调整因子，和/或，源网络设备的TA调整因子。其中，所述目标网络设备对应的TA调整因子，可以用于基于源网络设备的TA值、以及目标网络设备的TA调整因子，计算得到目标网络设备的TA值；
另外，源网络设备的TA调整因子，可以用于基于目标网络设备的TA值、以及源网络设备的TA调整因子，计算得到源网络设备的TA值。
以目标网络设备的TA调整因子为例进行说明，源网络设备的TA值*目标网络设备的TA调整因子＝目标网络设备的TA值；需要理解的是，源网络设备的计算方式与其类似，不再进行赘述。
其中，所述第一通信单元71，接收源网络设备发来的指示信息；
其中，所述指示信息包括以下至少之一：终端设备与源网络设备和目标网络设备之间的时间边界；终端设备与源网络设备和目标网络设备之间的时间边界差。
相应的，所述接收源网络设备发来的同步指示信息之后，所述终端设备还包括：
第一处理单元72，基于所述指示信息和/或所述同步指示信息，确定以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
具体来说，可以基于所述指示信息和/或所述同步指示信息，确定所述终端设备与目标网络设备的TA值。
在此基础上，还可以基于终端设备与源网络设备之间的TA值以及终端设备与目标网络设备的TA值，确定得到终端设备与源网络设备以及目标网络设备之间的TA差。
进一步地，确定TA差时，一种方式可以采用指示信息来确定，比如，可以为基于终端设备与源网络设备的时间边界、以及终端设备与目标网络设备的时间边界之间的差值，估计得到终端设备与源网络设备以及目标网络设备之间的TA差。其中，终端设备和网络设备之间的时间边界可以理解为无线帧的起始点。
再比如，可以为基于终端设备与源网络设备、以及终端设备与目标网络设备之间的时间边界差，确定得到终端设备与源网络设备以及目标网络设备之间的TA差。
这种方式可以主要应用于下行同步中。
或者，另一种方式可以为直接根据同步指示信息确定TA差，比如，可以包括以下至少之一：
获取到终端设备在目标网络设备的TA值，然后根据自身检测得到的终端设备与源网络设备之间的TA值；进而还可以计算得到两者之间的TA差；
根据终端设备在源网络设备的TA偏移值、以及终端设备在目标网络设备的TA偏移值，计算两者的差作为TA差；
基于目标网络设备对应的TA调整因子计算得到目标网络设备的TA值，结合目标网络设备的TA以及源网络设备的TA值确定两者的TA差；和/或，基于源网络设备的TA调整因子确定源网络设备的TA值，结合源网络设备的TA值以及目标网络设备的TA值，确定两者的TA差。
再一种方式，即结合同步指示信息以及所述指示信息共同确定TA差，可以将前述两种处理结合使用；比如，可以包括：
可以为基于终端设备与源网络设备的时间边界、以及终端设备与目标网络设备的时间边界，结合同步指示信息中终端设备在目标网络设备的TA值，然后根据自身检测得到的终端设备与源网络设备之间的TA值，还可以计算得到两者之间的TA差。
或者，还可以基于终端设备与源网络设备、以及终端设备与目标网络设备之间的时间边界差，结合基于目标网络设备对应的TA调整因子计算得到目标网络设备的TA值，结合目标网络设备的TA以及源网络设备的TA值确定两者的TA差；和/或，基于源网络设备的TA调整因子确定源网络设备的TA值，结合源网络设备的TA值以及目标网络设备的TA值，确定两者的TA差。
当然，还可以存在其他的结合方式，这里不再进行穷举。并且，还可以理解的是，前述确定TA值之后，可以进一步确定TA差，也可以不再计算TA差仅获取TA值，具体实施可以根据实际情况来设置，本实施例中不做限定。
另外，还需要说明的是，所述定时提前(TA，timing advance)可以用于上行传输，指为了将上行包在希望的时间到达网络设备，预估由于距离引起的射频传输时延，提前相应时间发出数据包。为了保证网络设备侧的时间同步，LTE提出了上行定时提前(Uplink Timing Advance)的机制。在终端设备侧看来，TA本质上是接收到下行子帧的起始时间与传输上行子帧的时间之间的一个负偏移(negative offset)。网络设备通过适当地控制每个终端设备的偏移，可以控制来自不同终端设备的上行信号到达网络设备的时间。对于离网络设备较远的终端设备，由于有较大的传输延迟，就要比离网络设备较近的终端设备提前发送上行数据。关于针对上行传输中获取TA的方式，可以由网络设备通过测量终端设备的上行传输来确定每个终端设备的TA值；可以理解为，只要终端设备有上行传输，网络设备就可以用来估计TA值。
本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；
所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例八、
本发明实施例提供了一种终端设备，包括：
第二通信单元，向网络设备发送同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
需要指出的是，本实施例中，网络设备可以为源网络设备，也可以为目标网络设备；换句话说，终端设备可以将同步指示信息发送给源网络设备，也可以将同步指示信息发送给目标网络设备。
关于同步指示信息，可以由RRC消息承载。其中，所述RRC消息至少包含测量上报消息。
需要理解的是，当同步指示信息中包含测量上报消息时，还可以接收网络侧源网络设备或目标网络设备发来的测量配置，基于测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧；
相应的，辅助网络设备获取终端设备与源网络设备以及终端设备与目标网络设备之间的TA差，可以为源网络设备或目标网络设备根据测量上报消息中的测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
另外，还需要说明的是，所述定时提前(TA，timing advance)可以用于上行传输，
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：终端设备在源网络设备和目标网络设备的信号测量差；终端设备与源网络设备和目标网络设备之间的距离差；终端设备与源网络设备和目标网络设备之间的路损差；终端设备与网络设备的TA值信息；目标网络设备标识；终端设备选取的候选目标网络设备标识。
另外，所述同步指示信息中，除上述信息之外，还可以包括：候选目标小区列表；所述候选目标小区列表中，包括但不限于以下至少之一：小区标识(cell id)，测量结果(如RSRP)，定位信息，路损信息。
具体的，同步指示信息中，包括终端设备在源网络设备和目标网络设备的测量差(如RSRP)，也可以是终端设备在源网络设备和目标网络设备距离差(如根据定位参考信号等获取)，也可是推荐的TA值信息，如与源小区的TA值，或者各种的结合。
终端设备可以测量得到源网络设备的信号测量结果，并且得到目标网络设备的信号测量结果，基于两个结果确定终端设备在源网络设备和目标网络设备的信号测量差；
关于终端设备与源网络设备以及目标网络设备之间的距离差可以通过源网络设备以及目标网络设备的物理位置以及终端设备的物理位置来确定；其中，获取网络设备的物理位置的方式可以为网络侧预配置的，或者还可以为向网络侧请求获取的，这里不进行限定，终端设备自身的物理位置的确定方式可以为根据GPS模块来确定当然还可以根据自身所处小区来确定，或者，终端设备根据定位参考信号测量确定位置信息，不进行穷举。
终端设备与网络设备的TA值信息中，可以包括有以下至少之一：源网络设备的TA值，与源网络设备间的TA偏移值offset，与目标网络设备间的TA偏移值，与目标网络设备的TA值，与目标网络设备的TA调整因子，与源网络设备的TA调整因子。
另外，当终端设备预先获取网络侧配置的至少一个候选目标网络设备的相关信息时，可以在切换失败或者进行切换的时候，直接通知网络侧当前选取的目标网络设备的标识信息。此时，可以为终端设备选定的要切换的目标网络设备的标识；当然，还可以为终端设备选取了几个通信质量较好的候选目标网络设备，将候选目标网络设备的标识发送给源网络设备，由源网络设备为其选取目标网络设备。其中，通信质量较好可以通过针对参考信号的测量结果来确定，比如，可以为信噪比大于预设信噪比门限值的，或者是信噪比排序靠前的N个(N大于等于1且小于等于全部候选网络设备的数量)。当然还可以采用其他参数来衡量通信质量的好坏，比如，可以为信号强度、噪声强度，也可以这些参数结合使用，这里不再穷举，并且需要理解的是，选取的方式与前述基于信噪比进行选取的方式类似，不再赘述。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例九、
本发明实施例提供了一种网络设备，包括：
第三通信单元，接收终端设备发来的同步指示信息；
其中，所述同步指示信息用于辅助网络设备获取以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
进一步地，本实施例还可以包括：基于所述同步指示信息，获取所述终端设备与源网络设备以及所述终端设备与目标网络设备之间的定时提前TA差。
需要指出的是，本实施例中，网络设备可以为源网络设备，也可以为目标网络设备；换句话说，终端设备可以将同步指示信息发送给源网络设备，也可以将同步指示信息发送给目标网络设备。
关于同步指示信息，可以由RRC消息承载。其中，所述RRC消息至少包含测量上报消息。
需要理解的是，当同步指示信息中包含测量上报消息时，还可以接收网络侧源网络设备或目标网络设备发来的测量配置，基于测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧；
相应的，网络设备，比如源网络设备或目标网络设备，根据测量上报消息中的测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：终端设备在源网络设备和目标网络设备的信号测量差；终端设备与源网络设备和目标网络设备之间的距离差；终端设备与源网络设备和目标网络设备之间的路损差；终端设备与网络设备的TA值信息；目标网络设备标识；终端设备选取的候选目标网络设备标识。
另外，所述同步指示信息中，除上述信息之外，还可以包括：候选目标小区列表；所述候选目标小区列表中，包括但不限于以下至少之一：小区标识(cell id)，测量结果(如RSRP)，定位信息，路损信息。
具体的，同步指示信息中，包括终端设备在源网络设备和目标网络设备的测量差(如RSRP)，也可以是终端设备在源网络设备和目标网络设备距离差(如根据定位参考信号等获取)，也可是推荐的TA值信息，如与源小区的TA值，或者各种的结合。
终端设备可以测量得到源网络设备的信号测量结果，并且得到目标网络设备的信号测量结果，基于两个结果确定终端设备在源网络设备和目标网络设备的信号测量差；
关于终端设备与源网络设备以及目标网络设备之间的距离差可以通过源网络设备以及目标网络设备的物理位置以及终端设备的物理位置来确定；其中，获取网络设备的物理位置的方式可以为网络侧预配置的，或者还可以为向网络侧请求获取的，这里不进行限定，终端设备自身的物理位置的确定方式可以为根据GPS模块来确定当然还可以根据自身档期所处小区来确定，或者，终端设备根据定位参考信号测量确定位置信息，不进行穷举。
终端设备与网络设备的TA值信息中，可以包括有以下至少之一：源网络设备的TA值，与源网络设备间的TA偏移值offset，与目标网络设备间的TA偏移值，与目标网络设备的TA值，与目标网络设备的TA调整因子，与源网络设备的TA调整因子。
网络设备在接收到同步指示信息之后，可以执行以下至少之一：
基于终端设备在源网络设备的信号测量值、以及终端与目标网络设备的信号测量值确定信号测量差；进而确定终端设备在源网络设备以及终端设备在目标网络设备的TA差；
基于终端设备与源网络设备以及目标网络设备之间的距离差，直接确定TA差；
源网络设备的TA值并结合目标网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值；
源网络设备的TA值并结合目标网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值，进而确定TA差；
目标网络设备的TA至并结合源网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值；
目标网络设备的TA至并结合源网络设备的TA调整因子，确定源网络设备以及目标网络设备的TA值，进而确定TA差。
当然对应不同的TA值信息可以存在不同的结合方式进行处理得到TA差，这里不再进行穷举。还需要指出的是，当终端设备存在多个候选目标网络设备时，并且向其中一个目标网络设备发起切换流程的时候，在同步指示信息中，需要包含有目标网络设备标识或者选取的候选目标网络设备标识。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例十、
本发明实施例提供了一种网络设备，包括：第四通信单元，向终端设备发送同步指示信息；
其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
同步指示信息，可以由RRC消息承载。本实施例中，同步指示信息由源网络设备发送给终端设备，也就是可以通过在RRC消息中携带该同步指示信息发送至终端设备。
其中，所述RRC消息至少包括：重配置消息，切换命令。也就是说，若同步指示信息可以由网络设备发送给终端设备，则可以在RRC消息中通知终端设备，RRC消息包括但不限于重配置消息，切换命令。
本实施例还可以为终端设备提供测量配置，当然还可以不为终端设备提供测量配置。相应的，当为终端设备提供测量配置的情况下，基于所述测量配置进行测量；得到测量结果，将所述测量结果上报给网络侧，具体的可以为为上报至网络侧的源网络设备侧；进而，源网络设备可以基于所述测量结果，确定所述终端设备与源网络设备、以及终端设备与目标网络设备之间的TA差。
其中，所述测量结果中，可以包括有针对源网络设备的参考信号的测量结果，以及针对至少一个目标网络设备的参考信号的测量结果。
需要指出的是，RRC消息还可以为新的RRC消息，其构成可以通过在RRC消息中引入新的测量IE，该IE配置测量，并专用于同步指示信息，具体可以根据实际情况进行设置，这里不再进行赘述。
关于终端设备针对参考信号进行测量，可以为针对源网络设备和/或至少一个目标网络设备发送的参考信号进行测量；比如，可以包括有以下至少之一：小区标识，频率标识，测量ID，允许的测量带宽，SSB，CRS(小区特定的参考信号，也叫公共参考信号)、MBSFN-RS、UE-specific RS(移动台特定的参考信号)、PRS以及CSI-RS等参考信号，这里不再进行穷举。
另外，第四通信单元，可以采用新的RRC消息或RRC重配置信息，指示UE上报在源基站的TA值，或者推荐的TA值，或者推荐的TA值范围。
在上述场景基础上，所述同步指示信息中，还包括以下至少之一：
终端设备在目标网络设备侧的TA值；终端设备在源网络设备以及目标网络设备的TA偏移值；TA调整因子。
终端设备接收到网络设备发来的同步指示信息中，可以包括有终端设备在目标网络设备的TA值；可以为通过目标网络设备发送给源网络设备，从而由源网络设备发送给终端设备；关于目标网络设备获取TA值的方式，可以通过上述描述的方式，这里不再赘述。
同步指示信息中，TA偏移值，即TA offset，可以为TA命令指示的偏移时间；目标网络设备的TA偏移值也可以由目标网络设备发送至源网络设备，然后源网络设备将目标网络设备的TA偏移值以及源网络设备的TA值共同发送给终端设备。
所述TA调整因子，可以为网络设备侧根据实际情况设置的值，可以包括有：目标网络设备对应的TA调整因子，和/或，源网络设备的TA调整因子。其中，所述目标网络设备对应的TA调整因子，可以用于基于源网络设备的TA值、以及目标网络设备的TA调整因子，计算得到目标网络设备的TA值；
另外，源网络设备的TA调整因子，可以用于基于目标网络设备的TA值、以及源网络设备的TA调整因子，计算得到源网络设备的TA值。
以目标网络设备的TA调整因子为例进行说明，源网络设备的TA值*目标网络设备的TA调整因子＝目标网络设备的TA值；需要理解的是，源网络设备的计算方式与其类似，不再进行赘述。
相应的，所述方法还包括：发送指示信息；
其中，所述指示信息包括以下至少之一：终端设备与源网络设备和目标网络设备之间的时间边界；终端设备与源网络设备和目标网络设备之间的时间边界差。
本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还可以为维持两套协议栈的场景，所述终端设备保留与源网络设备的第一协议栈以及第一相关密钥、并且维护与第一目标网络设备之间的第二协议栈以及第二相关密钥；
所述第一相关密钥与第二相关密钥不同。
其中，第一协议栈与第二协议栈可以相同也可以不同，或者至少部分不同，比如，当针对5G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的服务数据应用协议(SDAP，Service Data Adaptation Protocol)、不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体；当针对4G系统的时候，可以为终端设备与源网络设备、以及终端设备与第一目标网络设备之间维护不同的分组数据汇聚协议(PDCP，Packet Data Convergence Protocol)、不同的无线链路层控制协议(RLC，Radio Link Control)、不同的媒体访问控制(MAC)实体、不同的低层(Low layer)实体。另外，本实施例提供的方案中，为了保证使用不同密钥，第一协议栈以及第二协议栈的PDCP一定是不同的。SDAP、RLC、MAC以及物理层中至少之一，则可以相同也可以不同。或者，所述第一协议栈以及第二协议栈可以共用SDAP、RLC、MAC以及物理层中至少之一，或者可以分别拥有SDAP、RLC、MAC以及物理层。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例十一、
本发明实施例提供了一种网络设备，包括：
第五通信单元，向终端设备发送同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
本实施例与前述实施例不同之处在于，本实施例中网络设备可以为终端设备配置至少一个候选目标网络设备进行测量；并且，能够获取到终端设备的上报。
本实施例中辅助网络设备获取上述信息，可以为直接获取终端设备上报的以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
当然，还可以为获取终端设备上报的一些测量结果，根据测量结果的辅助使得网络设备能获取以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
同步指示信息，可以由RRC消息承载。所述RRC消息至少包括：重配置消息，测量命令。
所述同步指示信息中，包括以下至少之一：候选目标网络设备的标识；测量对象配置；上报配置。
其中，所述候选目标网络设备的标识可以为一个或多个，也就是网络设备将需要测量的全部候选目标网络设备的标识均通知给终端设备，可以为终端设备能够测量到的所有网络设备中的至少部分网络设备。
所述测量对象配置，可以包括有配置终端设备进行RSRP的测量、距离差、路损差的测量等等。
所述上报配置，可以包括有上报的信息格式，以及上报的信息内容等。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同 步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还需要说明的是，本实施例中，网络设备接收到终端设备上报的上述信息之后，还可以根据所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中至少之一信息，来为终端设备选取目标网络设备，进而执行图3中所示的切换处理流程，这里不再进行赘述。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
实施例十二、
本发明实施例提供了一种终端设备，如图8所示包括：
第六通信单元81，接收网络设备发送的同步指示信息；
其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
本实施例与前述实施例不同之处在于，本实施例中网络设备可以为终端设备配置至少一个候选目标网络设备进行测量；并且，能够获取到终端设备的上报。
本实施例中辅助网络设备获取上述信息，可以为直接获取终端设备上报的以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
当然，还可以为获取终端设备上报的一些测量结果，根据测量结果的辅助使得网络设备能获取以下至少之一：所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
同步指示信息，可以由RRC消息承载。所述RRC消息至少包括：重配置消息，测量命令。
所述同步指示信息中，包括以下至少之一：候选目标网络设备的标识；测量对象配置；上报配置。
其中，所述候选目标网络设备的标识可以为一个或多个，也就是网络设备将需要测量的全部候选目标网络设备的标识均通知给终端设备，可以为终端设备能够测量到的所有网络设备中的至少部分网络设备。
所述测量对象配置，可以包括有配置终端设备进行RSRP的测量、距离差、路损差的测量等等。
所述上报配置，可以包括有上报的信息格式，以及上报的信息内容等。
针对本实施例，可以应用于多种场景，可以为任何终端设备和源网络设备/目标网络设备TA不同的切换场景，如为切换发生在网络设备间，或者网络设备内但是不同频点的小区，或者其他不同步的网络设备之间等。
当然，还可以为终端设备在切换处理中，能够获取多个候选目标网络设备(或候选目标小区)的情况，此时，可以由源网络设备将多个候选目标网络设备均发送至终端设备，终端设备每次选取一个目标网络设备发起切换处理，也就是本实施例中的目标网络设备可以为至少一个候选目标网络设备中的一个。
还需要说明的是，本实施例中，所述接收网络设备发送的同步指示信息之后，所述终端设备还包括：
第六处理单元82，基于所述同步指示信息对候选目标网络设备进行测量，得到测量结果；
基于测量结果，确定以下至少之一：
所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
比如，可以为根据同步指示信息中的候选目标网络设备的标识对网络设备配置的候选目标网络设备进行测量，并得到RSRP、路损差、距离差中的至少之一，进而确定所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中的至少之一。
相应的，网络设备接收到终端设备上报的上述信息之后，还可以根据所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中至少之一信息，来为终端设备选取目标网络设备，进而执行图3中所示的切换处理流程，这里不再进行赘述。
进一步地，前述根据同步指示信息确定所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差中的至少之一的方式，可以为：
根据源网络设备对应的RSRP估计得到与源网络设备的TA值，候选目标网络设备采用同样的处理方法不再赘述；在此基础上，可以进一步计算得到TA差；
或者，根据终端设备与源网络设备的距离、终端设备与至少一个候选目标网络设备的距离，计算得到终端设备与源网络设备、以及终端设备与至少一个候选目标网络设备之间的至少一个距离差， 可以基于所述至少一个距离差，估算得到至少一个TA差。
需要理解的是，前述仅为确定TA值或TA差的示例性描述，实际上可以存在其他的处理方式，只是这里不再进行穷举。
可见，通过采用上述方案，根据同步指示信息的辅助，获取到终端设备与源网络设备的TA值、以及与目标网络设备的TA值、以及两者之间的TA差中的至少之一，从而能够保证终端设备在切换时获取到源网络设备以及目标网络设备的同步差，不必在指定的时刻跟指定的网络设备进行通信。
图9是本申请实施例提供的一种通信设备900示意性结构图，通信设备可以为本实施例前述的终端设备或者网络设备。图9所示的通信设备900包括处理器910，处理器910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。
可选地，如图9所示，通信设备900还可以包括存储器920。其中，处理器910可以从存储器920中调用并运行计算机程序，以实现本申请实施例中的方法。
其中，存储器920可以是独立于处理器910的一个单独的器件，也可以集成在处理器910中。
可选地，如图9所示，通信设备900还可以包括收发器930，处理器910可以控制该收发器930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930可以包括发射机和接收机。收发器930还可以进一步包括天线，天线的数量可以为一个或多个。
可选地，该通信设备900具体可为本申请实施例的网络设备，并且该通信设备900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。
可选地，该通信设备900具体可为本申请实施例的终端设备、或者网络设备，并且该通信设备900可以实现本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
图8是本申请实施例的芯片的示意性结构图。图8所示的芯片800包括处理器810，处理器810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。
可选地，如图10所示，芯片1000还可以包括存储器1020。其中，处理器1010可以从存储器1020中调用并运行计算机程序，以实现本申请实施例中的方法。其中，存储器1020可以是独立于处理器1010的一个单独的器件，也可以集成在处理器1010中。
可选地，该芯片1000还可以包括输入接口1030。其中，处理器1010可以控制该输入接口1030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。
可选地，该芯片1000还可以包括输出接口1040。其中，处理器1010可以控制该输出接口1040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。
可选地，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。
可选地，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。
图11是本申请实施例提供的一种通信系统1100的示意性框图。如图11所示，该通信系统1100包括终端设备1110和网络设备1120。其中，该终端设备1110可以用于实现上述方法中由终端设备实现的相应的功能，以及该网络设备1120可以用于实现上述方法中由网络设备实现的相应的功能为了简洁，在此不再赘述。
应理解，本申请实施例的处理器可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解，上述存储器为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静 态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例还提供了一种计算机可读存储介质，用于存储计算机程序。
可选的，该计算机可读存储介质可应用于本申请实施例中的网络设备，并且该计算机程序使得计算机执行本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机可读存储介质可应用于本申请实施例中的终端设备，并且该计算机程序使得计算机执行本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机程序产品，包括计算机程序指令。
可选的，该计算机程序产品可应用于本申请实施例中的网络设备，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机程序产品可应用于本申请实施例中的移动终端/终端设备，并且该计算机程序指令使得计算机执行本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
本申请实施例还提供了一种计算机程序。
可选的，该计算机程序可应用于本申请实施例中的网络设备，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
可选地，该计算机程序可应用于本申请实施例中的移动终端/终端设备，当该计算机程序在计算机上运行时，使得计算机执行本申请实施例的各个方法中由移动终端/终端设备实现的相应流程，为了简洁，在此不再赘述。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (63)

  1. 一种同步指示方法，应用于终端设备，包括：
    接收源网络设备发来的同步指示信息；
    其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  2. 根据权利要求1所述的方法，其中，所述同步指示信息由RRC消息承载。
  3. 根据权利要求2所述的方法，其中，所述RRC消息至少包括：重配置消息，切换命令。
  4. 根据权利要求1所述的方法，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在目标网络设备侧的TA值；
    终端设备在源网络设备以及目标网络设备的TA偏移值；
    TA调整因子。
  5. 根据权利要求1或4所述的方法，其中，所述方法还包括：
    接收源网络设备发来的指示信息；
    其中，所述指示信息包括以下至少之一：
    终端设备与源网络设备和目标网络设备之间的时间边界；
    终端设备与源网络设备和目标网络设备之间的时间边界差。
  6. 根据权利要求5所述的方法，其中，所述接收源网络设备发来的同步指示信息之后，所述方法还包括：
    基于所述指示信息和/或所述同步指示信息，确定以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  7. 一种同步指示方法，应用于终端设备，包括：
    向网络设备发送同步指示信息；
    其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  8. 根据权利要求7所述的方法，其中，所述同步指示信息由RRC消息承载。
  9. 根据权利要求8所述的方法，其中，所述RRC消息至少包含测量上报消息。
  10. 根据权利要求7所述的方法，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在源网络设备和目标网络设备的信号测量差；
    终端设备与源网络设备和目标网络设备之间的距离差；
    终端设备与网络设备的TA值信息；
    目标网络设备标识；
    终端设备选取的候选目标网络设备标识。
  11. 一种同步指示方法，应用于网络设备，包括：
    接收终端设备发来的同步指示信息；
    其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  12. 根据权利要求11所述的方法，其中，所述同步指示信息由RRC消息承载。
  13. 根据权利要求12所述的方法，其中，所述RRC消息至少包含测量上报消息。
  14. 根据权利要求11所述的方法，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在源网络设备和目标网络设备的信号测量差；
    终端设备与源网络设备和目标网络设备之间的距离差；
    终端设备与网络设备的TA值信息；
    目标网络设备标识；
    终端设备推荐采用的目标网络设备标识。
  15. 一种同步指示方法，应用于网络设备，包括：
    向终端设备发送同步指示信息；
    其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  16. 根据权利要求15所述的方法，其中，所述同步指示信息由RRC消息承载。
  17. 根据权利要求16所述的方法，其中，所述RRC消息包括但不限于重配置消息，切换命令。
  18. 根据权利要求15所述的方法，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在目标网络设备侧的TA值；
    终端设备在源网络设备以及目标网络设备的TA偏移值；
    TA调整因子。
  19. 根据权利要求15或18所述的方法，其中，所述方法还包括：
    向终端设备发送指示信息；所述指示信息包括以下至少之一：
    终端设备与源网络设备和目标网络设备之间的时间边界；
    终端设备与源网络设备和目标网络设备之间的时间边界差。
  20. 一种同步指示方法，应用于网络设备，包括：
    向终端设备发送同步指示信息；
    其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
  21. 根据权利要求20所述的方法，其中，所述同步指示信息由RRC消息承载。
  22. 根据权利要求21所述的方法，其中，所述RRC消息包括但不限于重配置消息，测量命令。
  23. 根据权利要求20所述的方法，其中，所述同步指示信息中，包括以下至少之一：
    候选目标网络设备的标识；
    测量对象配置；
    上报配置。
  24. 一种同步指示方法，应用于终端设备，包括：
    接收网络设备发送的同步指示信息；
    其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
  25. 根据权利要求24所述的方法，其中，所述同步指示信息由RRC消息承载。
  26. 根据权利要求25所述的方法，其中，所述RRC消息包括但不限于重配置消息，测量命令。
  27. 根据权利要求24所述的方法，其中，所述同步指示信息中，包括以下至少之一：
    候选目标网络设备的标识；
    测量对象配置；
    上报配置。
  28. 根据权利要求24所述的方法，其中，所述接收网络设备发送的同步指示信息之后，所述方法还包括：
    基于所述同步指示信息对候选目标网络设备进行测量，得到测量结果；
    基于测量结果，确定以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
  29. 一种终端设备，包括：
    第一通信单元，接收源网络设备发来的同步指示信息；
    其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  30. 根据权利要求29所述的终端设备，其中，所述同步指示信息由RRC消息承载。
  31. 根据权利要求30所述的终端设备，其中，所述RRC消息至少包括：重配置消息，切换命令。
  32. 根据权利要求29所述的终端设备，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在目标网络设备侧的TA值；
    终端设备在源网络设备以及目标网络设备的TA偏移值；
    TA调整因子。
  33. 根据权利要求29或32所述的终端设备，其中，所述第一通信单元，接收源网络设备发来的指示信息；
    其中，所述指示信息包括以下至少之一：
    终端设备与源网络设备和目标网络设备之间的时间边界；
    终端设备与源网络设备和目标网络设备之间的时间边界差。
  34. 根据权利要求33所述的终端设备，其中，所述终端设备还包括：
    第一处理单元，基于所述指示信息和/或所述同步指示信息，确定以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  35. 一种终端设备，包括：
    第二通信单元，向网络设备发送同步指示信息；
    其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  36. 根据权利要求35所述的终端设备，其中，所述同步指示信息由RRC消息承载。
  37. 根据权利要求36所述的终端设备，其中，所述RRC消息至少包含测量上报消息。
  38. 根据权利要求35所述的终端设备，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在源网络设备和目标网络设备的信号测量差；
    终端设备与源网络设备和目标网络设备之间的距离差；
    终端设备与网络设备的TA值信息；
    目标网络设备标识；
    终端设备选取的候选目标网络设备标识。
  39. 一种网络设备，包括：
    第三通信单元，接收终端设备发来的同步指示信息；
    其中，所述同步指示信息用于辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  40. 根据权利要求39所述的网络设备，其中，所述同步指示信息由RRC消息承载。
  41. 根据权利要求40所述的网络设备，其中，所述RRC消息至少包含测量上报消息。
  42. 根据权利要求39所述的网络设备，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在源网络设备和目标网络设备的信号测量差；
    终端设备与源网络设备和目标网络设备之间的距离差；
    终端设备与网络设备的TA值信息；
    目标网络设备标识；
    终端设备推荐采用的目标网络设备标识。
  43. 一种网络设备，包括：
    第四通信单元，向终端设备发送同步指示信息；
    其中，所述同步指示信息用于辅助终端设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与目标网络设备的TA差。
  44. 根据权利要求43所述的网络设备，其中，所述同步指示信息由RRC消息承载。
  45. 根据权利要求44所述的网络设备，其中，所述RRC消息包括但不限于重配置消息，切换命令。
  46. 根据权利要求43所述的网络设备，其中，所述同步指示信息中，还包括以下至少之一：
    终端设备在目标网络设备侧的TA值；
    终端设备在源网络设备以及目标网络设备的TA偏移值；
    TA调整因子。
  47. 根据权利要求43或46所述的网络设备，其中，所述第四通信单元，向终端设备发送指示信息；所述指示信息包括以下至少之一：
    终端设备与源网络设备和目标网络设备之间的时间边界；
    终端设备与源网络设备和目标网络设备之间的时间边界差。
  48. 一种网络设备，包括：
    第五通信单元，向终端设备发送同步指示信息；
    其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
  49. 根据权利要求48所述的网络设备，其中，所述同步指示信息由RRC消息承载。
  50. 根据权利要求49所述的网络设备，其中，所述RRC消息包括但不限于重配置消息，测量命令。
  51. 根据权利要求50所述的网络设备，其中，所述同步指示信息中，包括以下至少之一：
    候选目标网络设备的标识；
    测量对象配置；
    上报配置。
  52. 一种终端设备，包括：
    第六通信单元，接收网络设备发送的同步指示信息；
    其中，所述同步指示信息，用于配置终端设备对候选目标网络设备进行测量，以辅助网络设备获取以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
  53. 根据权利要求52所述的终端设备，其中，所述同步指示信息由RRC消息承载。
  54. 根据权利要求53所述的终端设备，其中，所述RRC消息包括但不限于重配置消息，测量命令。
  55. 根据权利要求52所述的终端设备，其中，所述同步指示信息中，包括以下至少之一：
    候选目标网络设备的标识；
    测量对象配置；
    上报配置。
  56. 根据权利要求55所述的终端设备，其中，所述接终端设备还包括：
    第六处理单元，基于所述同步指示信息对候选目标网络设备进行测量，得到测量结果；
    基于测量结果，确定以下至少之一：
    所述终端设备与源网络设备的定时提前TA值；所述终端设备与候选目标网络设备的TA值；所 述终端设备与源网络设备以及所述终端设备与候选目标网络设备的TA差。
  57. 一种终端设备，包括：处理器和用于存储能够在处理器上运行的计算机程序的存储器，
    其中，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，执行如权利要求1-10、24-28任一项所述方法的步骤。
  58. 一种网络设备，包括：处理器和用于存储能够在处理器上运行的计算机程序的存储器，
    其中，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，执行如权利要求11-23任一项所述方法的步骤。
  59. 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1-10、24-28中任一项所述的方法。
  60. 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11-23中任一项所述的方法。
  61. 一种计算机可读存储介质，所述计算机可读存储介质用于存储计算机程序，所述计算机程序使得计算机执行如权利要求1-28任一项所述方法的步骤。
  62. 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1-28中任一项所述的方法。
  63. 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1-28中任一项所述的方法。
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