WO2022062824A1 - 定时提前补偿方法、基站、终端和存储介质 - Google Patents

定时提前补偿方法、基站、终端和存储介质 Download PDF

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Publication number
WO2022062824A1
WO2022062824A1 PCT/CN2021/114735 CN2021114735W WO2022062824A1 WO 2022062824 A1 WO2022062824 A1 WO 2022062824A1 CN 2021114735 W CN2021114735 W CN 2021114735W WO 2022062824 A1 WO2022062824 A1 WO 2022062824A1
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WIPO (PCT)
Prior art keywords
target cell
base station
cell
terminal
interface
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PCT/CN2021/114735
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English (en)
French (fr)
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WO2022062824A9 (zh
Inventor
赵亚利
Original Assignee
大唐移动通信设备有限公司
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Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to US18/022,744 priority Critical patent/US20230232289A1/en
Priority to EP21871197.6A priority patent/EP4221325A1/en
Publication of WO2022062824A1 publication Critical patent/WO2022062824A1/zh
Publication of WO2022062824A9 publication Critical patent/WO2022062824A9/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0891—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for synchronized access

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to a timing advance compensation method, a base station, a terminal, and a storage medium.
  • the terminal does not obtain the TA pre-compensation value that it can use in the target cell. Therefore, when the UE (User Equipment, user equipment) accesses the target cell, the TA used for the first uplink transmission is unreasonable. , which leads to random access failure and reduces the handover success rate.
  • UE User Equipment, user equipment
  • the embodiments of the present disclosure provide a timing advance compensation method, a base station, a terminal, and a storage medium, so as to improve the cell handover success rate of a terminal.
  • an embodiment of the present disclosure provides a timing advance compensation method, including:
  • the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • the source cell or the target cell is any of the following types of cells:
  • the performing uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH (Physical Uplink Shared Channel, physical layer uplink shared channel) of the terminal in the target cell. )transmission.
  • PUSCH Physical Uplink Shared Channel, physical layer uplink shared channel
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • NG Next Generation
  • the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through an interface between network devices, the timing advance TA compensation related information used by the terminal when the target cell performs uplink transmission, including:
  • the interface between the network devices is the Xn interface
  • the TA compensation related information after receiving the handover request of the terminal sent by the source base station through the Xn interface, send the TA compensation related information to the source base station through the Xn interface;
  • the interface between the network devices is an NG interface
  • receive a handover request of the terminal sent by the core network where the handover request is sent by the source base station to the core network through the NG interface;
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • the method further includes, the target base station compensating for the transmission delay of the feeder link.
  • an embodiment of the present disclosure provides a timing advance compensation method, including:
  • Receive TA compensation related information sent by the source cell where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • Uplink transmission is performed based on the TA compensation related information.
  • the source cell or the target cell is any of the following types of cells:
  • the uplink transmission refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type may be a terrestrial cell or a satellite cell.
  • performing uplink transmission based on the TA compensation related information including:
  • the TA compensation related information is the transmission delay of the feeder link of the target cell, then based on the terminal location information, ephemeris information and the transmission delay of the feeder link of the target cell, determine the the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the TA compensation value of the target cell, determining the TA compensation value of the target cell as the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the ephemeris information, determining the TA value used when the target cell performs uplink transmission based on the terminal location information and the ephemeris information;
  • the TA compensation related information is the target cell reference point location information and the TA information corresponding to the target cell reference point, then calculate the TA information of the target cell based on the terminal location information and the target cell reference point location information
  • the difference between the TA and the terminal's own TA, and the TA value used when the target cell performs uplink transmission is determined according to the difference and the TA information corresponding to the reference point of the target cell;
  • the TA compensation related information is the cell type indication information of the target cell, determine that the target cell is a terrestrial cell based on the cell type indication information of the target cell, and determine to use it when the target cell performs uplink transmission
  • the TA value of 0 is 0;
  • the receiving the TA compensation related information sent by the source base station to which the source cell belongs is specifically:
  • RRC Radio Resource Control, radio resource control
  • an embodiment of the present disclosure provides a timing advance compensation method, including:
  • the source cell or the target cell is any of the following types of cells:
  • the performing uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the interface NG interface between the core network device and the source base station.
  • the obtaining the TA compensation related information sent by the target base station to which the target cell belongs through the interface between network devices and used by the terminal when performing uplink transmission in the target cell includes:
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an NG interface
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • sending the TA compensation related information to the terminal specifically:
  • an embodiment of the present disclosure provides a base station, including a memory, a transceiver, and a processor:
  • a memory for storing a computer program
  • a transceiver for sending and receiving data under the control of the processor
  • a processor for reading the computer program in the memory and performing the following operations:
  • the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • the source cell or the target cell is any of the following types of cells:
  • the performing uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through an interface between network devices, the timing advance TA compensation related information used by the terminal when the target cell performs uplink transmission, including:
  • the interface between the network devices is the Xn interface
  • the TA compensation related information after receiving the handover request of the terminal sent by the source base station through the Xn interface, send the TA compensation related information to the source base station through the Xn interface;
  • the interface between the network devices is the NG interface, receive the handover request of the terminal sent by the core network, and the handover request is sent by the source base station to the core network through the NG interface;
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • the operation further includes, the target base station compensating for the transmission delay of the feeder link.
  • an embodiment of the present disclosure provides a terminal, including a memory, a transceiver, and a processor:
  • a memory for storing a computer program
  • a transceiver for sending and receiving data under the control of the processor
  • a processor for reading the computer program in the memory and performing the following operations:
  • Receive TA compensation related information sent by the source cell where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • Uplink transmission is performed based on the TA compensation related information.
  • the source cell or the target cell is any of the following types of cells:
  • the uplink transmission refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type may be a terrestrial cell or a satellite cell.
  • performing uplink transmission based on the TA compensation related information including:
  • the TA compensation related information is the transmission delay of the feeder link of the target cell, then based on the terminal location information, ephemeris information and the transmission delay of the feeder link of the target cell, determine the the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the TA compensation value of the target cell, determining the TA compensation value of the target cell as the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the ephemeris information, determining the TA value used when the target cell performs uplink transmission based on the terminal location information and the ephemeris information;
  • the TA compensation related information is the target cell reference point location information and the TA information corresponding to the target cell reference point, then calculate the TA information of the target cell based on the terminal location information and the target cell reference point location information
  • the difference between the TA and the terminal's own TA, and the TA value used when the target cell performs uplink transmission is determined according to the difference and the TA information corresponding to the reference point of the target cell;
  • the TA compensation related information is the cell type indication information of the target cell, determine that the target cell is a terrestrial cell based on the cell type indication information of the target cell, and determine to use it when the target cell performs uplink transmission
  • the TA value of 0 is 0;
  • the receiving the TA compensation related information sent by the source base station to which the source cell belongs is specifically:
  • an embodiment of the present disclosure provides a base station, including a memory, a transceiver, and a processor:
  • a memory for storing a computer program
  • a transceiver for sending and receiving data under the control of the processor
  • a processor for reading the computer program in the memory and performing the following operations:
  • the source cell or the target cell is any of the following types of cells:
  • the performing uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the interface NG interface between the core network device and the source base station.
  • the obtaining the TA compensation related information sent by the target base station to which the target cell belongs through the interface between network devices and used by the terminal when performing uplink transmission in the target cell includes:
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an NG interface
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • sending the TA compensation related information to the terminal specifically:
  • an embodiment of the present disclosure provides a base station, including:
  • the first sending module is used for the target base station to which the target cell belongs to send, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • an embodiment of the present disclosure provides a terminal, including:
  • a receiving module configured to receive TA compensation related information sent by the source cell, where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • An uplink transmission module configured to perform uplink transmission based on the TA compensation related information.
  • an embodiment of the present disclosure provides a base station, including:
  • an acquisition module configured to acquire the TA compensation related information that is used by the terminal when the target cell performs uplink transmission and is sent by the target base station to which the target cell belongs through the interface between the network devices;
  • a second sending module configured to send the TA compensation related information to the terminal.
  • an embodiment of the present disclosure provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is configured to cause the processor to execute the timing provided in the first aspect
  • the processor-readable storage medium stores a computer program
  • the computer program is configured to cause the processor to execute the timing provided in the first aspect
  • For the advance compensation method either execute the timing advance compensation method provided by the second aspect, or execute the timing advance compensation method provided by the third aspect.
  • the terminal when the terminal performs cell handover, the terminal sends to the terminal the timing advance TA compensation related information used by the terminal when the terminal performs uplink transmission in the target cell, so that the terminal can clearly and accurately determine that it is switched to
  • the TA pre-compensation value used by the target cell can reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • FIG. 1 is a schematic flowchart of a cell handover based on an Xn interface provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of a cell handover based on an NG interface provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic flowchart of a timing advance compensation method provided by the first embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart of a timing advance compensation method provided by a second embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart of a timing advance compensation method provided by a third embodiment of the present disclosure.
  • FIG. 6 is a schematic flowchart of a timing advance compensation method provided by a fourth embodiment of the present disclosure.
  • FIG. 7 is a schematic flowchart of a timing advance compensation method provided by a fifth embodiment of the present disclosure.
  • FIG. 8 is a schematic flowchart of a timing advance compensation method provided by a sixth embodiment of the present disclosure.
  • FIG. 9 is a schematic flowchart of a timing advance compensation method provided by a seventh embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a base station provided by an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of a base station provided by another embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of a base station provided by another embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of a terminal provided by another embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram of a base station according to still another embodiment of the present disclosure.
  • the term "and/or" describes the association relationship of associated objects, and indicates that there can be three kinds of relationships. For example, A and/or B can indicate that A exists alone, A and B exist at the same time, and B exists alone these three situations.
  • the character “/” generally indicates that the associated objects are an "or" relationship.
  • the term “plurality” refers to two or more than two, and other quantifiers are similar.
  • the embodiments of the present disclosure provide a timing advance compensation method and device, so as to ensure that the terminal can clearly and accurately determine the TA pre-compensation value used by the target cell to which it is handed over during the cell handover process, and reasonably perform timing advance compensation.
  • the method and the device are conceived based on the same application. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and repeated descriptions will not be repeated here.
  • the handover in the current terrestrial cellular network is mainly to provide continuous and stable service to the UE in the connected state.
  • the main scenarios of handover are: handover based on UE mobility and handover based on network side load conditions.
  • the handover of NR can be divided into intra-base station handover, inter-base station handover, and inter-system handover.
  • Inter-base station handover can be further divided into Xn handover and NG handover, which are described below:
  • FIG. 1 is a schematic flowchart of a cell handover based on an Xn interface provided by an embodiment of the present disclosure; as shown in FIG. 1 , when an available Xn interface exists between two base stations and a UE moves between the coverages of the two base stations , Xn switching can be used;
  • Step 100 terminal measurement reporting
  • This step includes that the source base station to which the source cell belongs configures the measurement configuration for the connected terminal.
  • the terminal performs the measurement; when the measurement reporting conditions are met, the terminal can report the measurement results to the source base station to which the source cell belongs through the measurement report message. ;
  • Step 110 handover request
  • the source base station to which the source cell belongs performs handover judgment. If handover needs to be performed, the source base station can send a handover request message (HANDOVER REQUEST in the 5G system) to the target base station to which the target cell belongs through the inter-base station interface (Xn interface in the 5G system).
  • HANDOVER REQUEST in the 5G system
  • Xn interface in the 5G system
  • Step 120 confirming the handover request
  • the target base station to which the target cell belongs After receiving the handover request sent by the source base station, the target base station to which the target cell belongs, makes an admission decision. If it can be accepted, a handover command can be sent to the source cell (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE).
  • Step 130 RRC reconfiguration
  • the source cell After receiving the handover command from the target cell, the source cell can notify the terminal of the handover configuration information through the RRC reconfiguration process.
  • Step 140 the RRC reconfiguration is completed
  • the terminal informs the target cell of the terminal that the handover process has been completed by sending an RRC reconfiguration complete message to the target cell.
  • RRC reconfiguration complete message there are two ways to send the RRC reconfiguration complete message:
  • the terminal can use the PUSCH resources allocated by the target cell in the handover command to directly send the RRC reconfiguration complete message, that is, the terminal is in the target cell.
  • the first uplink transmission performed is PUSCH transmission.
  • the terminal needs to initiate a random access procedure in the target cell to obtain the TA value and PUSCH resources before sending the RRC reconfiguration complete message, that is, the first uplink transmission performed by the terminal in the target cell is random. Accessed Msg1 or MsgA.
  • Step 150 a path conversion request
  • the target cell sends a path switching request to the core network device to notify the core network device to change the data route.
  • Step 160 confirming the path conversion request
  • the target cell After receiving the data routing change confirmation message from the core network, the target cell notifies the source cell to release the context of the terminal
  • Step 170 UE context release.
  • the target cell After receiving the data route change confirmation message replied by the core network, the target cell notifies the source cell to release the context of the terminal.
  • FIG. 2 is a schematic flowchart of a cell handover based on an NG interface provided by an embodiment of the present disclosure; as shown, if there is no available Xn interface between two base stations, the handover process can be completed through the NG interface, and the process of NG handover as follows:
  • Step 200 terminal measurement reporting
  • This step includes that the source base station to which the source cell belongs configures the measurement configuration for the connected terminal.
  • the terminal When it is determined that the measurement conditions are met, the terminal performs the measurement; when the measurement reporting conditions are met, the terminal can report the measurement results to the source base station through a measurement report message;
  • Step 210 handover preparation
  • the source base station to which the source cell belongs performs handover judgment. If it is determined that handover needs to be performed, and there is no direct interface between the source base station to which the source cell belongs and the target base station to which the target cell belongs, the source base station can pass the connection between the source base station and the core network equipment.
  • the interface (NG interface in the 5G system) sends a handover request message (the name of the message sent between the source base station and the core network device in the 5G system is the handover preparation message: HANDOVER REQUIRED).
  • Step 220 switch confirmation
  • the core network device After receiving the handover request sent by the source base station, the core network device can send the handover request to the target base station to which the target cell belongs (the HANDOVER REQUEST message is used in the 5G system)
  • Step 230 confirming the handover request
  • the base station to which the target cell belongs After receiving the handover request message sent by the core network equipment, the base station to which the target cell belongs can make an acceptance decision, and if it can be accepted, send a handover request confirmation message to the core network equipment (the HANDOVER REQUEST ACKNOWLEDGE message is used in the 5G system)
  • Step 240 switching command
  • the core network equipment sends a handover command to the source base station (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE).
  • Step 250 RRC reconfiguration
  • the source base station may notify the terminal of the handover configuration information through the RRC reconfiguration process.
  • Step 260 the RRC reconfiguration is completed
  • the terminal informs the target cell of the terminal that the handover process has been completed by sending an RRC reconfiguration complete message to the target cell.
  • RRC reconfiguration complete message there are two ways to send the RRC reconfiguration complete message:
  • the terminal can directly send the RRC reconfiguration complete message using the PUSCH resources allocated by the target cell in the handover command, that is, the first uplink transmission performed by the terminal in the target cell is PUSCH transmission.
  • the terminal needs to initiate a random access procedure in the target cell to obtain the TA value and PUSCH resources before sending the RRC reconfiguration complete message, that is, the first uplink transmission performed by the terminal in the target cell is random. Accessed Msg1 or MsgA.
  • Step 270 switch notification
  • the target cell After the terminal successfully accesses the target cell, the target cell needs to inform the core network that the terminal successfully accesses the target cell.
  • Step 280 UE context release
  • the core network notifies the source cell to release the context.
  • Step 290 the UE context release is completed.
  • the source cell replies with an acknowledgement message to the core network.
  • the TA pre-compensation values used by terminals in different cells may be different, and due to existing cell handovers between base stations
  • the interface does not carry TA pre-compensation related indication information, so when the UE accesses the target cell, the random access may fail due to the unreasonable use of TA, which reduces the success rate of handover.
  • the present disclosure proposes a timing advance compensation method in the process of cell handover.
  • the target base station to which the target cell belongs provides the terminal with the timing advance TA compensation related information used in the uplink transmission of the target cell, so that the terminal can clearly and accurately
  • the TA pre-compensation value used by the target cell to which it is handed over is determined accurately, and the timing advance compensation is reasonably performed, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • FIG. 3 is a schematic flowchart of a timing advance compensation method provided by the first embodiment of the present disclosure. As shown in FIG. 3 , the method includes:
  • Step 300 the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • an important feature of uplink transmission is that different terminals have orthogonal multiple access (orthogonal multiple access) in time and frequency, that is, uplink transmissions of different UEs from the same cell do not interfere with each other.
  • the base station requires that the arrival times of signals from different terminals in the same subframe but with different frequency domain resources (different RBs) are basically aligned.
  • a mechanism of Uplink Timing Advance is proposed. From the perspective of the terminal side, the timing advance is essentially a negative offset (negative offset) between the start time when the downlink subframe is received and the time when the uplink subframe is transmitted.
  • the base station can control the time when uplink signals from different terminals arrive at the base station. For a terminal farther away from the base station, due to a larger transmission delay, it is necessary to send uplink data earlier than a UE closer to the base station.
  • the terminal when the terminal is preparing to switch to the target cell, it can use the timing advance TA compensation information used by the terminal to perform uplink transmission in the target cell is unknown. Therefore, when the terminal performs cell handover, the target base station to which the target cell belongs can be The source base station to which the source cell belongs is sent through the network interface to the source base station to which the source cell belongs, which carries the timing advance TA compensation related information that the terminal can use when performing uplink transmission in the target cell.
  • the TA compensation related information is sent to the terminal, and the terminal can determine the TA value it uses when performing uplink transmission in the target cell based on the TA compensation related information, and perform uplink transmission based on the TA value, for example, based on the TA value.
  • TA value for the first uplink transmission is sent to the terminal, and the terminal can determine the TA value it uses when performing uplink transmission in the target cell based on the TA compensation related information, and perform uplink transmission based on the TA value, for example, based on the TA value.
  • the terminal when the terminal performs cell handover, the terminal sends to the terminal the timing advance TA compensation related information used by the terminal when the terminal performs uplink transmission in the target cell, so that the terminal can clearly and accurately determine that it is switched to
  • the TA pre-compensation value used by the target cell can reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • the source cell or the target cell is any of the following types of cells:
  • the source cell may be a terrestrial cell or a satellite cell; similarly, the target cell may also be a terrestrial cell or a satellite cell;
  • the applicable scenarios of this embodiment may be, but are not limited to, handover of a terminal from one satellite cell to another satellite cell, handover of a terminal from a terrestrial cell to a satellite cell, handover of a terminal from a satellite cell to a terrestrial cell, and handover of a terminal from a terrestrial cell Handover to another terrestrial cell.
  • the performing uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the TA compensation related information that it can use when performing uplink transmission in the target cell is unknown, but the TA compensation used for uplink transmission after the access is successful
  • the relevant information is based on the incremental adjustment of the TA used by the terminal for the first transmission in the target cell. Therefore, in this embodiment, the TA compensation related information used by the terminal when performing uplink transmission in the target cell can actually be considered as the TA compensation related information used by the terminal when the terminal performs the first uplink transmission in the target cell.
  • the first uplink transmission performed by the target cell may be the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the network interface may be one of the following interfaces:
  • the direct interface between the source base station and the target base station such as the Xn interface of the 5G system; or the interface between the target base station and the core network equipment and the interface between the network equipment and the source base station, such as the NG interface of the 5G system; corresponding to the base station respectively Switch between Xn switching and NG switching.
  • the target base station to which the target cell belongs can transmit the TA compensation related information to the source base station, so that the source cell sends the TA compensation related information Complete the uplink transmission to the terminal.
  • the target base station to which the target cell belongs transmits, to the source base station to which the source cell belongs, through an interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell, include:
  • the interface between the network devices is the Xn interface
  • the TA compensation related information after receiving the handover request of the terminal sent by the source base station through the Xn interface, send the TA compensation related information to the source base station through the Xn interface;
  • the interface between network devices is an Xn interface, that is, if there is a direct interface between the source base station and the target base station, the target base station to which the target cell belongs can directly use the Xn interface to transfer the TA used by the terminal when the terminal performs uplink transmission in the target cell.
  • the compensation related information is sent to the source base station to which the source cell belongs.
  • the source base station will send a handover request message (HANDOVER REQUEST in the 5G system) to the target base station to which the target cell belongs through Xn, and the target base station will receive the terminal handover request sent by the source base station through the Xn interface. Then, make an admission decision. If it is confirmed that the terminal can be accepted, the TA compensation related information can be directly sent to the source base station to which the source cell belongs through the Xn interface; for example, a handover command is sent to the source base station (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE), the handover command carries TA compensation related information.
  • a handover request message HANDOVER REQUEST in the 5G system
  • the target base station will receive the terminal handover request sent by the source base station through the Xn interface. Then, make an admission decision. If it is confirmed that the terminal can be accepted, the TA compensation related information can be directly sent to the source base station to which the source cell belongs through the Xn interface;
  • the target base station receives the handover request of the terminal sent by the core network, and the handover request is sent by the source base station to the core network through the NG interface;
  • the target base station sends the TA compensation related information to the core network, so that the core network sends the TA compensation related information to the source base station through the NG interface.
  • the interface between network devices is an NG interface, that is, if there is no direct interface between the source base station and the target base station, when the target base station sends TA compensation related information to the source base station, it needs to pass the NG interface with the core network device.
  • the interface is sent to the core network device, and then forwarded by the core network device to the source base station;
  • the source cell passes through the interface between the source base station to which the source cell belongs and the core network equipment (NG in the 5G system). interface) to send a handover request message to the core network device (the name of the message sent by the 5G system between the source base station to which the source cell belongs and the core network device is the handover preparation message: HANDOVER REQUIRED).
  • NG core network equipment
  • the core network equipment After the core network equipment receives the handover request sent by the source base station, it sends the handover request to the target base station to which the target cell belongs (the HANDOVER REQUEST message is used in the 5G system); the target base station to which the target cell belongs, after receiving the handover request of the terminal sent by the core network After that, make an acceptance decision. If it is confirmed that the terminal can be accepted, the TA compensation related information can be sent to the core network device, for example, a handover request confirmation message (the HANDOVER REQUEST ACKNOWLEDGE message is used in the 5G system) can be sent to the core network device.
  • a handover request confirmation message (the HANDOVER REQUEST ACKNOWLEDGE message is used in the 5G system) can be sent to the core network device.
  • the message carries TA compensation related information; after receiving it, the core network forwards the TA compensation related information to the source base station to which the source cell belongs through the NG interface with the source base station to which the source cell belongs, for example, the core network equipment sends a handover command to the source base station (The specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE), and the handover confirmation message carries TA compensation related information;
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the TA compensation related information may be any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the terminal can determine the TA value it uses when performing uplink transmission in the target cell in different ways based on different TA compensation related information. And perform uplink transmission based on the TA value.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • the factors that can be referred to are the TA compensation value of the target cell and/or the cell type indication information of the target cell.
  • the method further includes: the target base station to which the target cell belongs compensates for the feeder link of the feeder link. transmission delay.
  • the target base station can compensate by itself when the terminal performs the first uplink transmission Transmission delay of the feeder link.
  • FIG. 4 is a schematic flowchart of a timing advance compensation method provided by the second embodiment of the present disclosure. As shown in FIG. 4 , the method includes:
  • Step 400 receiving TA compensation related information sent by the source cell, where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • the terminal when the terminal is preparing to switch to the target cell, the timing advance TA compensation related information that it can use for uplink transmission in the target cell is unknown. Therefore, when the terminal performs cell handover, it can receive the TA compensation related information sent by the source cell. information, wherein the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • the target base station to which the target cell belongs sends the source base station to which the source cell belongs through the network interface to the source base station to which the source cell belongs, and carries the timing advance TA compensation related information used for uplink transmission in the target cell.
  • the source base station to which the source cell belongs acquires the TA compensation related information.
  • the TA compensation related information is sent to the terminal. For example, it is sent to the terminal through RRC reconfiguration signaling.
  • Step 410 Perform uplink transmission based on the TA compensation related information.
  • the terminal can determine the TA value it uses when performing uplink transmission in the target cell based on the TA compensation related information, and perform uplink transmission based on the TA value, for example, based on the TA value Make the first uplink transmission.
  • the terminal when performing cell handover, by receiving the timing advance TA compensation information provided by the target base station and used by the terminal for uplink transmission in the target cell, the terminal can clearly and accurately determine the cell to which it is handed over.
  • the TA pre-compensation value used by the target cell can reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • the source cell or the target cell is any of the following types of cells:
  • the source cell may be a terrestrial cell or a satellite cell; similarly, the target cell may also be a terrestrial cell or a satellite cell;
  • the applicable scenarios of this embodiment may be, but are not limited to, handover of a terminal from one satellite cell to another satellite cell, handover of a terminal from a terrestrial cell to a satellite cell, handover of a terminal from a satellite cell to a terrestrial cell, and handover of a terminal from a terrestrial cell Handover to another terrestrial cell.
  • the uplink transmission refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the TA compensation related information that it can use when performing uplink transmission in the target cell is unknown, but the TA used for uplink transmission after successful access is unknown.
  • the compensation related information is based on the incremental adjustment of the TA used by the terminal for the first transmission in the target cell. Therefore, in this embodiment, the TA compensation related information used by the terminal in the target cell for uplink transmission can actually be considered as the TA compensation related information used by the terminal in the first uplink transmission in the target cell.
  • the first uplink transmission may be the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the network interface may be one of the following interfaces:
  • the direct interface between the source base station and the target base station such as the Xn interface of the 5G system; or the interface between the target base station and the core network equipment and the interface between the network equipment and the source base station, such as the NG interface of the 5G system; corresponding to the base station respectively Switch between Xn switching and NG switching.
  • the terminal can obtain the TA compensation-related information provided by the target base station, that is, the target base station can transmit the TA compensation-related information to the source base station.
  • the process in which the source cell sends the TA compensation related information to the terminal can obtain the TA compensation-related information provided by the target base station, that is, the target base station can transmit the TA compensation-related information to the source base station.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type may be a terrestrial cell or a satellite cell.
  • the TA compensation related information may be any one of the following or a combination thereof:
  • the cell type is a terrestrial cell or a satellite cell
  • the TA compensation related information may be the combination of the transmission delay of the feeder link of the target cell and the ephemeris information, and the terminal may determine the TA value it uses when performing uplink transmission in the target cell based on this combination of information.
  • performing uplink transmission based on the TA compensation related information includes:
  • the TA compensation related information is the transmission delay of the feeder link of the target cell, then based on the terminal location information, ephemeris information and the transmission delay of the feeder link of the target cell, determine the the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the TA compensation value of the target cell, determining the TA compensation value of the target cell as the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the ephemeris information, determining the TA value used when the target cell performs uplink transmission based on the terminal location information and the ephemeris information;
  • the TA compensation related information is the target cell reference point location information and the TA information corresponding to the target cell reference point, then calculate the TA information of the target cell based on the terminal location information and the target cell reference point location information
  • the difference between the TA and the terminal's own TA, and the TA value used when the target cell performs uplink transmission is determined according to the difference and the TA information corresponding to the reference point of the target cell;
  • the TA compensation related information is the cell type indication information of the target cell, determine that the target cell is a terrestrial cell based on the cell type indication information of the target cell, and determine to use it when the target cell performs uplink transmission
  • the TA value of 0 is 0;
  • the terminal may determine the TA value used by the terminal for the first uplink transmission in the target cell based on the TA related compensation information.
  • the uplink transmission may be: random access Msg1 (message1) or MsgA (messageA) or PUSCH transmission.
  • the terminal can determine the TA value it uses when performing uplink transmission in the target cell in different ways based on different TA compensation related information, and Uplink transmission is performed based on the TA value.
  • the terminal can use its own location information, ephemeris information and the transmission time of the feeder link of the target cell to The three delays can determine the TA value used when the target cell performs uplink transmission; wherein, the ephemeris information used by the terminal may be pre-stored by the terminal, or may be provided by the target base station to which the target cell belongs.
  • the terminal may directly determine the TA compensation value as the TA value it uses when performing uplink transmission in the target cell.
  • the terminal can determine the TA value it uses when performing uplink transmission in the target cell according to its own location information and ephemeris information, where the delay of the Feeder link is Compensated by satellite.
  • the terminal determines that the target cell is a TN cell, the terminal determines that the TA value used when the target cell performs uplink transmission is 0.
  • the receiving the TA compensation related information sent by the source base station to which the source cell belongs is specifically:
  • the source base station to which the source cell belongs may notify the terminal of the handover configuration information through the RRC reconfiguration process, wherein the RRC reconfiguration message includes the information that the terminal is in the target cell TA compensation related information.
  • the terminal when performing cell handover, the terminal can clearly and accurately determine the timing advance TA compensation related information provided by the target base station to which the target cell belongs, which is used by the terminal for uplink transmission in the target cell.
  • the TA pre-compensation value used by the target cell to which it is handed over can reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • FIG. 5 is a schematic flowchart of a timing advance compensation method provided by a third embodiment of the present disclosure. As shown in FIG. 5 , the method includes:
  • Step 500 Acquire TA compensation related information that is used by the terminal when the target cell performs uplink transmission and is sent by the target base station to which the target cell belongs through the interface between network devices;
  • the timing advance TA compensation related information that the terminal can use when performing uplink transmission in the target cell is unknown. Therefore, the source base station to which the source cell belongs can obtain the target cell's belonging The target base station sends the TA compensation related information that the terminal uses when performing uplink transmission in the target cell through the interface between the network devices, and provides the TA compensation related information to the terminal, so that the terminal completes uplink transmission based on the TA compensation related information;
  • the target base station to which the target cell belongs sends the source base station to which the source cell belongs through the network interface to the source base station to which the source cell belongs, and carries the timing advance TA compensation information used by the terminal when performing uplink transmission in the target cell.
  • the source base station acquires TA compensation related information.
  • Step 510 Send the TA compensation related information to the terminal.
  • the source base station to which the source cell belongs acquires the TA compensation related information, it can send the TA compensation related information to the terminal during the handover process of the terminal from the source cell to the target cell, and the terminal can determine based on the TA compensation related information that it is in The TA value used by the target cell for uplink transmission, and the uplink transmission is performed based on the TA value, for example, the first uplink transmission is performed based on the TA value.
  • the terminal when the terminal performs cell handover, it receives the timing advance TA compensation related information provided by the target base station that the terminal uses when the terminal performs uplink transmission in the target cell, and sends it to the terminal, so that the terminal can Clearly and accurately determine the TA pre-compensation value used by the target cell to which it is handed over, and reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • the source cell or the target cell is any of the following types of cells:
  • the source cell may be a terrestrial cell or a satellite cell; similarly, the target cell may also be a terrestrial cell or a satellite cell;
  • the applicable scenarios of this embodiment may be, but are not limited to, handover of a terminal from one satellite cell to another satellite cell, handover of a terminal from a terrestrial cell to a satellite cell, handover of a terminal from a satellite cell to a terrestrial cell, and handover of a terminal from a terrestrial cell Handover to another terrestrial cell.
  • the performing uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the TA compensation related information that it can use when performing uplink transmission in the target cell is unknown, but the TA used for uplink transmission after successful access is unknown.
  • the compensation related information is based on the incremental adjustment of the TA used when the target cell makes the first transmission. Therefore, in this embodiment, the TA compensation related information used by the terminal in the target cell for uplink transmission can actually be considered as the TA compensation related information used by the terminal in the first uplink transmission in the target cell.
  • the first uplink transmission may be the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the interface NG interface between the core network device and the source base station.
  • the network interface may be one of the following interfaces:
  • the direct interface between the source base station and the target base station such as the Xn interface of the 5G system; or the interface between the target base station and the core network equipment and the interface between the network equipment and the source base station, such as the NG interface of the 5G system; corresponding to the base station respectively Switch between Xn switching and NG switching.
  • the target base station can transmit the TA compensation related information to the source base station, so that the source cell sends the TA compensation related information to the terminal.
  • the acquiring the TA compensation related information that is used by the terminal when performing uplink transmission in the target cell and sent by the target base station to which the target cell belongs through the interface between network devices includes:
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an Xn interface
  • the interface between network devices is an Xn interface, that is, if there is a direct interface between the source base station and the target base station, the source base station to which the source cell belongs can directly obtain from the target base station through the Xn interface when the terminal performs uplink transmission in the target cell.
  • the used timing advance TA compensation related information that is, the target base station can directly send the TA compensation related information to the source base station to which the source cell belongs through the Xn interface.
  • the source base station will send a handover request message (HANDOVER REQUEST in the 5G system) to the target base station to which the target cell belongs through Xn, and the target base station will receive the terminal handover request sent by the source base station through the Xn interface. Then, make an admission decision. If it is confirmed that the terminal can be accepted, the TA compensation related information can be directly sent to the source base station to which the source cell belongs through the Xn interface; for example, a handover command is sent to the source base station (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE), the handover command carries TA compensation related information.
  • a handover request message HANDOVER REQUEST in the 5G system
  • the target base station will receive the terminal handover request sent by the source base station through the Xn interface. Then, make an admission decision. If it is confirmed that the terminal can be accepted, the TA compensation related information can be directly sent to the source base station to which the source cell belongs through the Xn interface;
  • the interface between the network devices is an NG interface
  • the interface between network devices is an NG interface, that is, if there is no direct interface between the source base station and the target base station, the target base station to which the target cell belongs, when sending TA compensation-related information to the source base station, needs to communicate with the core network equipment The NG interface between them is forwarded to the source base station;
  • the source cell passes the interface between the source cell and the core network equipment (NG in the 5G system). interface) to send a handover request message to the core network device (the name of the message sent by the 5G system between the source cell and the core network device is the handover preparation message: HANDOVER REQUIRED).
  • the core network device After receiving the handover request sent by the source base station to which the source cell belongs, the core network device sends the handover request to the target base station to which the target cell belongs (the HANDOVER REQUEST message is used in the 5G system); the target base station receives the terminal handover request sent by the core network.
  • the TA compensation related information can be sent to the core network device, for example, a handover request confirmation message (the HANDOVER REQUEST ACKNOWLEDGE message is used in the 5G system) can be sent to the core network device.
  • the message carries TA compensation related information; after receiving it, the core network forwards the TA compensation related information to the source base station to which the source cell belongs through the NG interface with the source base station to which the source cell belongs, for example, the core network equipment sends a handover command to the source base station (The specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE), and the handover confirmation message carries TA compensation related information;
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the TA compensation related information may be any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the terminal can determine its compensation in different ways based on different TA compensation related information.
  • the TA value used when the target cell performs uplink transmission, and the uplink transmission is performed based on the TA value.
  • sending the TA compensation related information to the terminal is specifically:
  • the source base station to which the source cell belongs can notify the terminal of the handover configuration information through the RRC reconfiguration process, where the RRC reconfiguration message includes the TA compensation related to the terminal in the target cell. information.
  • the terminal when the terminal performs cell handover, the terminal receives the timing advance TA compensation related information provided by the target base station when the terminal performs uplink transmission in the target cell, and sends it to the terminal, so that the terminal can Clearly and accurately determine the TA pre-compensation value used by the target cell to which it is handed over, and reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • FIG. 6 is a schematic flowchart of the timing advance compensation method provided by the fourth embodiment of the present disclosure.
  • the applicable scenarios of the embodiment of the present disclosure include but are not limited to: handover of a terminal from one satellite cell to another satellite cell, and handover of a terminal from a terrestrial cell to a satellite cell; As shown in Figure 6, the method includes:
  • Step 600 the terminal measures and reports
  • the source base station to which the source cell belongs configures the measurement configuration for the connected terminal, and when the measurement conditions are met, the terminal performs the measurement; when the measurement reporting conditions are met, the terminal reports the measurement result to the source base station through a measurement report message;
  • Step 610 handover request
  • the source base station to which the source cell belongs performs a handover judgment, and if a handover needs to be performed, the source base station serving the terminal will send a handover request message (5G system is HANDOVER REQUEST).
  • Step 620 confirm the handover request
  • the target base station After receiving the handover request sent by the source base station to which the source cell belongs, the target base station makes an admission decision. If it can be accepted, send a handover command to the source base station (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE).
  • the handover command needs to carry TA compensation related information used by the terminal when performing uplink transmission in the target cell
  • the TA compensation related information used by the terminal when performing uplink transmission in the target cell may include one or a combination of the following:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • Step 630 RRC reconfiguration
  • the source base station to which the source cell belongs after receiving the handover command from the target base station, notifies the terminal of the handover configuration information through the RRC reconfiguration process.
  • the RRC reconfiguration message needs to include at least the TA compensation related information in step 620 .
  • Step 640 the RRC reconfiguration is completed
  • the terminal informs the target cell of the terminal that the handover process has been completed by sending an RRC reconfiguration complete message to the target cell.
  • RRC reconfiguration complete message there are two ways to send the RRC reconfiguration complete message:
  • the terminal can directly send the RRC reconfiguration complete message using the PUSCH resources allocated by the target cell in the handover command, that is, the first uplink transmission performed by the terminal in the target cell is PUSCH transmission.
  • the terminal needs to initiate a random access procedure in the target cell to obtain the TA value and PUSCH resources before sending the RRC reconfiguration complete message, that is, the first uplink transmission performed by the terminal in the target cell is random. Accessed Msg1 or MsgA.
  • the terminal when the terminal sends the RRC reconfiguration complete message, regardless of whether it is a RACH-less handover or a non-RACH-less handover, the terminal can obtain TA compensation related information through the solutions proposed in the embodiments of the present disclosure.
  • the terminal may determine the TA used for the first uplink transmission in the target cell based on the TA related compensation information.
  • the uplink transmission may be the above-mentioned: Msg1 or MsgA or PUSCH transmission of random access.
  • the specific manner in which the terminal determines the TA value used by the terminal for the first uplink transmission in the target cell based on the TA-related compensation information may be, but not limited to, any one of the following or a combination thereof:
  • the terminal can use its own location information, ephemeris information and the transmission time of the feeder link of the target cell to The three delays can determine the TA value used when the target cell performs uplink transmission; wherein, the ephemeris information used by the terminal may be pre-stored by the terminal.
  • the terminal may directly determine the TA compensation value as the TA value it uses when performing uplink transmission in the target cell.
  • the terminal can determine the TA value it uses when performing uplink transmission in the target cell according to its own location information and ephemeris information, where the delay of the Feeder link is Compensated by satellite.
  • the terminal determines that the target cell is a TN cell, the terminal determines that the TA value used when the target cell performs uplink transmission is 0.
  • Step 650 path conversion request
  • the target cell sends a path switching request to the core network device to notify the core network device to change the data route.
  • Step 660 path conversion request response
  • the core network device sends a path switch confirmation message to the target cell.
  • Step 670 the UE context is released.
  • the target cell after receiving the data route change confirmation message replied by the core network, the target cell notifies the source cell to release the context of the terminal.
  • FIG. 7 is a schematic flowchart of a timing advance compensation method provided by the fifth embodiment of the present disclosure.
  • the applicable scenarios of the embodiment of the present disclosure include but are not limited to: handover of a terminal from one satellite cell to another satellite cell, and handover of a terminal from a terrestrial cell to a satellite cell; As shown in Figure 7, the method includes:
  • Step 700 the terminal measures and reports
  • the source base station to which the source cell belongs configures the measurement configuration for the connected terminal, and when the measurement conditions are met, the terminal performs the measurement; when the measurement reporting conditions are met, the terminal reports the measurement result to the source base station through a measurement report message;
  • Step 710 handover preparation
  • the source base station to which the source cell belongs performs handover judgment. If handover needs to be performed, and there is no direct interface between the source base station and the target base station, the source base station to which the source cell belongs will pass the interface between the source base station and the core network equipment (5G The NG interface in the system) sends a handover request message to the core network (the name of the message sent by the 5G system between the source cell and the core network equipment is the handover preparation message: HANDOVER REQUIRED).
  • Step 720 handover request
  • the core network device After receiving the handover request of the terminal sent by the source base station to which the source cell belongs, the core network device sends the handover request to the target base station (the HANDOVER REQUEST message is used in the 5G system).
  • Step 730 confirm the handover request
  • the target base station to which the target cell belongs After receiving the handover request sent by the core network device through the NG interface, the target base station to which the target cell belongs, makes an admission decision. If it can be accepted, send a handover request confirmation message to the core network device (the HANDOVER REQUEST ACKNOWLEDGE message is used in the 5G system).
  • the handover request confirmation message needs to carry TA compensation related information used by the terminal when performing uplink transmission in the target cell
  • the TA compensation related information used by the terminal when performing uplink transmission in the target cell may include one or a combination of the following :
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • Step 740 switch the command
  • the core network device sends a handover command to the source base station to which the source cell belongs (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE).
  • the handover command may carry TA compensation related information used by the terminal when performing uplink transmission in the target cell
  • Step 750 RRC reconfiguration
  • the source base station to which the source cell belongs after receiving the handover command from the target base station to which the target cell belongs, notifies the terminal of the handover configuration information through the RRC reconfiguration process.
  • the RRC reconfiguration message needs to include at least the TA compensation related information in step 740 .
  • Step 760 the RRC reconfiguration is completed
  • the terminal informs the target cell of the terminal that the handover process has been completed by sending an RRC reconfiguration complete message to the target cell.
  • RRC reconfiguration complete message there are two ways to send the RRC reconfiguration complete message:
  • the terminal can directly send the RRC reconfiguration complete message using the PUSCH resources allocated by the target cell in the handover command, that is, the first uplink transmission performed by the terminal in the target cell is PUSCH transmission.
  • the terminal needs to initiate a random access procedure in the target cell to obtain the TA value and PUSCH resources before sending the RRC reconfiguration complete message, that is, the first uplink transmission performed by the terminal in the target cell is random. Accessed Msg1 or MsgA.
  • the terminal may determine the TA used for the first uplink transmission in the target cell based on the TA related compensation information.
  • the uplink transmission may be the above-mentioned: Msg1 or MsgA or PUSCH transmission of random access.
  • the specific manner in which the terminal determines the TA value used by the terminal for the first uplink transmission in the target cell based on the TA-related compensation information may be, but not limited to, any one of the following or a combination thereof:
  • the terminal can use its own location information, ephemeris information and the transmission time of the feeder link of the target cell to The three delays can determine the TA value used when the target cell performs uplink transmission; wherein, the ephemeris information used by the terminal may be pre-stored by the terminal.
  • the terminal may directly determine the TA compensation value as the TA value it uses when performing uplink transmission in the target cell.
  • the terminal can determine the TA value it uses when performing uplink transmission in the target cell according to its own location information and ephemeris information, where the delay of the Feeder link is Compensated by satellite.
  • the terminal determines that the target cell is a TN cell, the terminal determines that the TA value used when the target cell performs uplink transmission is 0.
  • Step 770 switch notification
  • the target cell needs to inform the core network that the terminal successfully accesses the target cell.
  • Step 780 release in the terminal context
  • the core network notifies the source cell to release the context.
  • Step 790 the terminal context release is completed.
  • the source cell replies with an acknowledgement message to the core network.
  • FIG. 8 is a schematic flowchart of the timing advance compensation method provided by the sixth embodiment of the present disclosure.
  • the applicable scenarios of the embodiment of the present disclosure include but are not limited to: a terminal switching from a satellite cell to a terrestrial cell, or switching from one terrestrial cell to another terrestrial cell; such as As shown in Figure 8, the method includes:
  • Step 800 the terminal measures and reports
  • the source base station to which the source cell belongs configures the measurement configuration for the connected terminal, and when the measurement conditions are met, the terminal performs the measurement; when the measurement reporting conditions are met, the terminal reports the measurement result to the source base station through a measurement report message;
  • Step 810 handover request
  • the source base station to which the source cell belongs performs a handover judgment, and if a handover needs to be performed, the source base station serving the terminal will send a handover request message (5G system is HANDOVER REQUEST).
  • Step 820 confirm the handover request
  • the target base station to which the target cell belongs After receiving the handover request sent by the source base station to which the source cell belongs, the target base station to which the target cell belongs, makes an admission decision. If it can be accepted, send a handover command to the source base station (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE).
  • the handover command needs to carry TA compensation related information used by the terminal when performing uplink transmission in the target cell
  • the TA compensation related information used by the terminal when performing uplink transmission in the target cell may include one or a combination of the following:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • Step 830 RRC reconfiguration
  • the source base station to which the source cell belongs after receiving the handover command from the target base station to which the target cell belongs, notifies the terminal of the handover configuration information through the RRC reconfiguration process.
  • the RRC reconfiguration message needs to include at least the TA compensation related information in step 620 .
  • Step 840 the RRC reconfiguration is completed
  • the terminal informs the target cell of the terminal that the handover process has been completed by sending an RRC reconfiguration complete message to the target cell.
  • RRC reconfiguration complete message there are two ways to send the RRC reconfiguration complete message:
  • the terminal can directly send the RRC reconfiguration complete message using the PUSCH resources allocated by the target cell in the handover command, that is, the first uplink transmission performed by the terminal in the target cell is PUSCH transmission.
  • the terminal needs to initiate a random access procedure in the target cell to obtain the TA value and PUSCH resources before sending the RRC reconfiguration complete message, that is, the first uplink transmission performed by the terminal in the target cell is random. Accessed Msg1 or MsgA.
  • the terminal may determine the TA used for the first uplink transmission in the target cell based on the TA related compensation information.
  • the uplink transmission may be the above-mentioned: Msg1 or MsgA or PUSCH transmission of random access.
  • the specific manner in which the terminal determines the TA value used by the terminal for the first uplink transmission in the target cell based on the TA-related compensation information may be, but not limited to, any one of the following or a combination thereof:
  • the terminal may directly determine the TA compensation value as the TA value it uses when performing uplink transmission in the target cell.
  • the terminal determines that the target cell is a TN cell, the terminal determines that the TA value used when the target cell performs uplink transmission is 0.
  • Step 850 path conversion request
  • the target cell sends a path switching request to the core network device to notify the core network device to change the data route.
  • Step 860 path conversion request response
  • the core network device sends a path switch confirmation message to the target cell.
  • Step 870 the terminal context is released.
  • the target cell after receiving the data route change confirmation message replied by the core network, the target cell notifies the source cell to release the context of the terminal.
  • FIG. 9 is a schematic flowchart of a timing advance compensation method provided by the seventh embodiment of the present disclosure.
  • the applicable scenarios of the embodiment of the present disclosure include but are not limited to: a terminal switching from a satellite cell to a terrestrial cell, or switching from one terrestrial cell to another terrestrial cell; such as As shown in Figure 9, the method includes:
  • Step 900 the terminal measures and reports
  • the source base station to which the source cell belongs is configured with a measurement configuration for the connected terminal, and when the measurement conditions are met, the terminal performs measurement; when the measurement reporting conditions are met, the terminal reports the measurement results to the source base station through a measurement report message;
  • Step 910 handover preparation
  • the source base station to which the source cell belongs performs handover judgment. If handover needs to be performed, and there is no direct interface between the source base station and the target base station, the source base station passes the interface between the source base station and the core network equipment (NG in the 5G system). interface) to send a handover request message to the core network (the name of the message sent by the 5G system between the source cell and the core network device is the handover preparation message: HANDOVER REQUIRED).
  • NG core network equipment
  • Step 920 handover request
  • the core network device After receiving the handover request of the terminal sent by the source base station, the core network device sends the handover request to the target base station (the HANDOVER REQUEST message is used in the 5G system).
  • Step 930 confirm the handover request
  • the target base station to which the target cell belongs After receiving the handover request sent by the core network device through the NG interface, the target base station to which the target cell belongs, makes an admission decision. If it can be accepted, send a handover request confirmation message to the core network device (the HANDOVER REQUEST ACKNOWLEDGE message is used in the 5G system).
  • the handover request confirmation message needs to carry TA compensation related information used by the terminal when performing uplink transmission in the target cell
  • the TA compensation related information used by the terminal when performing uplink transmission in the target cell may include one or a combination of the following :
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • Step 940 switch the command
  • the core network device sends a handover command to the source base station to which the source cell belongs (the specific message in the 5G system is HANDOVER REQUEST ACKNOWLEDGE).
  • the handover command may carry TA compensation related information used by the terminal when performing uplink transmission in the target cell
  • Step 950 RRC reconfiguration
  • the source base station to which the source cell belongs after receiving the handover command from the target base station to which the target cell belongs, notifies the terminal of the handover configuration information through the RRC reconfiguration process.
  • the RRC reconfiguration message needs to include at least the TA compensation related information in step 940 .
  • Step 960 the RRC reconfiguration is completed
  • the terminal informs the target cell of the terminal that the handover process has been completed by sending an RRC reconfiguration complete message to the target cell.
  • RRC reconfiguration complete message there are two ways to send the RRC reconfiguration complete message:
  • the terminal can directly send the RRC reconfiguration complete message using the PUSCH resources allocated by the target cell in the handover command, that is, the first uplink transmission performed by the terminal in the target cell is PUSCH transmission.
  • the terminal needs to initiate a random access procedure in the target cell to obtain the TA value and PUSCH resources before sending the RRC reconfiguration complete message, that is, the first uplink transmission performed by the terminal in the target cell is random. Accessed Msg1 or MsgA.
  • the terminal may determine the TA used for the first uplink transmission in the target cell based on the TA related compensation information.
  • the uplink transmission may be the above-mentioned: Msg1 or MsgA or PUSCH transmission of random access.
  • the specific manner in which the terminal determines the TA value used by the terminal for the first uplink transmission in the target cell based on the TA-related compensation information may be, but not limited to, any one of the following or a combination thereof:
  • the terminal may directly determine the TA compensation value as the TA value it uses when performing uplink transmission in the target cell.
  • the terminal determines that the target cell is a TN cell, the terminal determines that the TA value used when the target cell performs uplink transmission is 0.
  • Step 970 switch notification
  • the target cell needs to inform the core network that the terminal successfully accesses the target cell.
  • Step 980 release in the terminal context
  • the core network notifies the source cell to release the context.
  • Step 990 the terminal context release is completed.
  • the source cell replies with an acknowledgement message to the core network.
  • applicable systems may be global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet Wireless service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, Long term evolution advanced (LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G New Radio (New Radio, NR) system, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA Wideband Code Division Multiple Access
  • general packet Wireless service general packet Radio service
  • GPRS general packet Wireless service
  • LTE long term evolution
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • LTE-A Long term evolution advanced
  • UMTS universal mobile
  • the terminal involved in the embodiments of the present disclosure may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem.
  • the name of the terminal may be different.
  • the terminal may be called user equipment (User Equipment, UE).
  • Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a radio access network (Radio Access Network, RAN).
  • RAN Radio Access Network
  • "telephone) and computers with mobile terminal equipment eg portable, pocket-sized, hand-held, computer-built or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network.
  • Wireless terminal equipment may also be referred to as system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in the embodiments of the present disclosure.
  • the base station may include a plurality of cells providing services for the terminal.
  • the base station may also be called an access point, or may be a device in the access network that communicates with wireless terminal equipment through one or more sectors on the air interface, or other names.
  • the base station can be used to exchange received air frames with Internet Protocol (IP) packets, and act as a router between the wireless terminal equipment and the rest of the access network, which can include the Internet Protocol (IP) communication network.
  • IP Internet Protocol
  • the base station may also coordinate attribute management of the air interface.
  • the network device involved in the embodiments of the present disclosure may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile Communications (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA). ), it can also be a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or it can be an evolved network device in a long term evolution (LTE) system (evolutional Node B, eNB or e-NodeB), 5G base station (gNB) in 5G network architecture (next generation system), or Home evolved Node B (HeNB), relay node (relay node) , a home base station (femto), a pico base station (pico), etc., which are not limited in the embodiments of the present disclosure.
  • a base station may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be geographically separated.
  • CU centralized unit
  • DU
  • FIG. 10 is a schematic structural diagram of a base station provided by an embodiment of the present disclosure. As shown in FIG. 10 , the base station includes a memory 1001, a transceiver 1002, and a processor 1003, where:
  • the memory 1001 is used to store computer programs; the transceiver 1002 is used to send and receive data under the control of the processor; the processor 1003 is used to read the computer programs in the memory and perform the following operations:
  • the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • the transceiver 1002 is used to receive and transmit data under the control of the processor 1003 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 1003 and various circuits of memory represented by memory 1002 are linked together.
  • the bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein.
  • the bus interface provides the interface.
  • Transceiver 1002 may be a number of elements, including transmitters and receivers, that provide means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like.
  • the processor 1003 is responsible for managing the bus architecture and general processing, and the memory 1001 may store data used by the processor 1003 in performing operations.
  • the processor 1003 may be a central processor (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (Complex Programmable Logic Device). , CPLD), the processor can also use a multi-core architecture.
  • CPU central processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • CPLD complex programmable logic device
  • the source cell or the target cell is any of the following types of cells:
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the target base station to which the target cell belongs sends to the source base station to which the source cell belongs through an interface between network devices the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell, including:
  • the interface between the network devices is the Xn interface
  • the TA compensation related information after receiving the handover request of the terminal sent by the source base station through the Xn interface, send the TA compensation related information to the source base station through the Xn interface;
  • the interface between the network devices is an NG interface
  • receive a handover request of the terminal sent by the core network where the handover request is sent by the source base station to the core network through the NG interface;
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the operation further includes: the target base station compensates for the transmission delay of the feeder link.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • FIG. 11 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure.
  • the base station includes a memory 1101, a transceiver 1102, and a processor 1103, where:
  • the memory 1101 is used to store computer programs; the transceiver 1102 is used to send and receive data under the control of the processor; the processor 1103 is used to read the computer programs in the memory and perform the following operations:
  • Receive TA compensation related information sent by the source cell where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • Uplink transmission is performed based on the TA compensation related information.
  • the transceiver 1102 is used to receive and transmit data under the control of the processor 1103 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically, one or more processors represented by the processor 1103 and various circuits of the memory represented by the memory 1101 are linked together.
  • the bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein.
  • the bus interface provides the interface.
  • Transceiver 1102 may be a number of elements, including transmitters and receivers, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like Transmission medium.
  • the user interface 1104 may also be an interface capable of externally connecting the required equipment, and the connected equipment includes but is not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1103 is responsible for managing the bus architecture and general processing, and the memory 1101 may store data used by the processor 1103 in performing operations.
  • the processor 1103 may be a CPU (central processor), an ASIC (Application Specific Integrated Circuit, an application-specific integrated circuit), an FPGA (Field-Programmable Gate Array, a field programmable gate array) or a CPLD (Complex Programmable Logic Device) , complex programmable logic devices), the processor can also use a multi-core architecture.
  • CPU central processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • CPLD Complex Programmable Logic Device
  • complex programmable logic devices complex programmable logic devices
  • the processor is configured to execute any one of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions by invoking the computer program stored in the memory.
  • the processor and memory may also be physically separated.
  • the source cell or the target cell is any of the following types of cells:
  • the above-mentioned terminal provided by the embodiments of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effect.
  • the beneficial effects are described in detail.
  • the uplink transmission refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the above-mentioned terminal provided by the embodiments of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effect.
  • the beneficial effects are described in detail.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the above-mentioned terminal provided by the embodiments of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effect.
  • the beneficial effects are described in detail.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type may be a terrestrial cell or a satellite cell.
  • the above-mentioned terminal provided by the embodiments of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effect.
  • the beneficial effects are described in detail.
  • performing uplink transmission based on the TA compensation related information including:
  • the TA compensation related information is the transmission delay of the feeder link of the target cell, then based on the terminal location information, ephemeris information and the transmission delay of the feeder link of the target cell, determine the the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the TA compensation value of the target cell, determining the TA compensation value of the target cell as the TA value used when the target cell performs uplink transmission;
  • the TA compensation related information is the ephemeris information, determining the TA value used when the target cell performs uplink transmission based on the terminal location information and the ephemeris information;
  • the TA compensation related information is the target cell reference point location information and the TA information corresponding to the target cell reference point, then calculate the TA information of the target cell based on the terminal location information and the target cell reference point location information
  • the difference between the TA and the terminal's own TA, and the TA value used when the target cell performs uplink transmission is determined according to the difference and the TA information corresponding to the reference point of the target cell;
  • the TA compensation related information is the cell type indication information of the target cell, determine that the target cell is a terrestrial cell based on the cell type indication information of the target cell, and determine to use it when the target cell performs uplink transmission
  • the TA value of 0 is 0;
  • the above-mentioned terminal provided by the embodiments of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effect.
  • the beneficial effects are described in detail.
  • the receiving the TA compensation related information sent by the source base station to which the source cell belongs is specifically:
  • the above-mentioned terminal provided by the embodiments of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiments, and can achieve the same technical effect.
  • the beneficial effects are described in detail.
  • FIG. 12 is a schematic structural diagram of a base station provided by another embodiment of the present disclosure. As shown in FIG. 12 , the base station includes a memory 1201, a transceiver 1202, and a processor 1203, where:
  • the memory 1201 is used to store computer programs; the transceiver 1002 is used to send and receive data under the control of the processor; the processor 1203 is used to read the computer programs in the memory and perform the following operations:
  • the transceiver 1202 is used to receive and transmit data under the control of the processor 1203 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically, one or more processors represented by the processor 1203 and various circuits of the memory represented by the memory 1201 are linked together.
  • the bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein.
  • the bus interface provides the interface.
  • Transceiver 1202 may be multiple elements, including a transmitter and a receiver, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like.
  • the processor 1203 is responsible for managing the bus architecture and general processing, and the memory 1201 may store data used by the processor 1203 in performing operations.
  • the processor 1203 may be a central processor (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (Complex Programmable Logic Device). , CPLD), the processor can also use a multi-core architecture.
  • CPU central processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • CPLD complex programmable logic device
  • the source cell or the target cell is any of the following types of cells:
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the uplink transmission in the target cell refers to the first message of the random access procedure initiated by the terminal in the target cell or the first PUSCH transmission of the terminal in the target cell.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the interfaces between the network devices are:
  • the direct interface Xn interface between the source base station and the target base station;
  • the interface NG interface between the core network device and the source base station.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the obtaining of the TA compensation related information sent by the target base station to which the target cell belongs through the interface between network devices and used by the terminal when performing uplink transmission in the target cell includes:
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an Xn interface
  • the interface between the network devices is an NG interface
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • the TA compensation related information includes any one of the following or a combination thereof:
  • Cell type indication information of the target cell wherein the cell type is a terrestrial cell or a satellite cell.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • sending the TA compensation related information to the terminal is specifically:
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, and the same parts and The beneficial effects are described in detail.
  • FIG. 13 is a schematic structural diagram of a base station provided by another embodiment of the present disclosure. As shown in FIG. 13 , the base station includes: a first sending module 1310; wherein:
  • the first sending module 1310 is used for the target base station to which the target cell belongs to send, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • the target base station to which the target cell belongs sends, through the first sending module 1310, to the source base station to which the source cell belongs through the interface between network devices, the timing advance TA compensation related information used by the terminal when the terminal performs uplink transmission in the target cell, so that the source base station After receiving the TA compensation related information, it is transmitted to the terminal for uplink transmission.
  • the terminal when the terminal performs cell handover, it sends to the terminal the timing advance TA compensation related information used by the terminal when the terminal performs uplink transmission in the target cell, so that the terminal can clearly and accurately determine the target cell to which it is handed over.
  • the used TA pre-compensation value can reasonably perform timing advance compensation, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • the above-mentioned base station provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect, which is not the same as the method embodiment in this embodiment.
  • the parts and beneficial effects will be described in detail.
  • FIG. 14 is a schematic structural diagram of a terminal provided by another embodiment of the present disclosure. As shown in FIG. 14 , the terminal includes: a receiving module 1410 and an uplink transmission module 1420; wherein:
  • the receiving module 1410 is configured to receive TA compensation related information sent by the source cell, where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • the uplink transmission module 1420 is configured to perform uplink transmission based on the TA compensation related information.
  • the terminal After receiving the TA compensation related information sent by the source cell through the receiving module 1410, the terminal performs uplink transmission based on the TA compensation related information through the uplink transmission module 1420.
  • the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through the interface between network devices.
  • the terminal when performing cell handover, by receiving the timing advance TA compensation information provided by the target base station when the terminal performs uplink transmission in the target cell, the terminal can clearly and accurately determine the target cell to which it is handed over.
  • the TA pre-compensation value can be reasonably compensated for timing advance, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • FIG. 15 is a schematic structural diagram of a base station provided by still another embodiment of the present disclosure. As shown in FIG. 15 , the base station includes: an obtaining module 1510 and a second sending module 1520; wherein:
  • the obtaining module 1510 is configured to obtain the TA compensation related information sent by the target base station to which the target cell belongs through the interface between the network devices when the terminal performs uplink transmission in the target cell; the second sending module 1520 is configured to send the TA compensation related information to the terminal.
  • the source base station to which the source cell belongs obtains, through the obtaining module 1510, the TA compensation related information sent by the target base station to which the target cell belongs through the interface between network devices when the terminal performs uplink transmission in the target cell; and then the second sending module 1520 Sending the TA compensation related information to the terminal, so that the terminal completes the uplink transmission based on the TA compensation related information.
  • the base station receives, when the terminal performs cell handover, the timing advance TA compensation information provided by the target base station that is used by the terminal when the terminal performs uplink transmission in the target cell, and sends it to the terminal, so that the terminal can clearly and accurately Determine the TA pre-compensation value used by the target cell to which it is handed over, and perform timing advance compensation reasonably, thereby improving the handover success rate of the terminal cell and reducing the handover delay.
  • each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a processor-readable storage medium.
  • the technical solutions of the present disclosure can be embodied in the form of software products in essence, or the part that contributes to the prior art, or all or part of the technical solutions, and the computer software product is stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present disclosure.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .
  • an embodiment of the present disclosure further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the foregoing implementations
  • Examples of provided methods include:
  • the target base station to which the target cell belongs sends, to the source base station to which the source cell belongs, through the interface between network devices, the timing advance TA compensation related information used by the terminal when performing uplink transmission in the target cell.
  • an embodiment of the present disclosure further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the foregoing implementations
  • Examples of provided methods include:
  • Receive TA compensation related information sent by the source cell where the TA compensation related information is sent by the target base station to which the target cell belongs to the source base station to which the source cell belongs through an interface between network devices;
  • Uplink transmission is performed based on the TA compensation related information.
  • an embodiment of the present disclosure further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the foregoing implementations
  • Examples of provided methods include:
  • the computer program stored thereon enables the processor to implement all the method steps implemented by the above method embodiments, and can achieve the same technical effect, and the description in this embodiment is not repeated here.
  • the same parts and beneficial effects as those in the method embodiment will be described in detail.
  • the processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (eg, floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (eg, CD, DVD, BD, HVD, etc.), and semiconductor memory (eg, ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state disk (SSD)), etc.
  • magnetic storage eg, floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.
  • optical storage eg, CD, DVD, BD, HVD, etc.
  • semiconductor memory eg, ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state disk (SSD)
  • embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.
  • processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the processor-readable memory result in the manufacture of means including the instructions product, the instruction means implements the functions specified in the flow or flow of the flowchart and/or the block or blocks of the block diagram.
  • processor-executable instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process that Execution of the instructions provides steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

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Abstract

本公开实施例提供一种定时提前补偿方法、基站、终端和存储介质，该方法包括目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。本公开各实施例通过在终端进行小区切换时，向终端发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。

Description

定时提前补偿方法、基站、终端和存储介质
相关申请的交叉引用
本申请要求于2020年09月24日提交的申请号为2020110173197，发明名称为“定时提前补偿方法、基站、终端和存储介质”的中国专利申请的优先权，其通过引用方式全部并入本文。
技术领域
本公开涉及通信技术领域，尤其涉及一种定时提前补偿方法、基站、终端和存储介质。
背景技术
卫星系统由于RTT(Round Trip Time，往返时延)较大，因此一般认为对于卫星通信系统的随机接入需要使用TA(Time Advance，定时提前量)预先补偿(pre-compensation)。
现有的小区切换流程中，终端未获取其在目标小区可以使用的TA预补偿值，因此可能导致UE(User Equipment，用户设备)接入目标小区时，第一次上行传输使用的TA不合理，导致随机接入失败，降低切换成功率。
因此，如何提出一种合理的定时提前补偿方法，成为亟需解决的问题。
发明内容
针对小区切换流程中切换成功率低的问题，本公开实施例提供一种定时提前补偿方法、基站、终端和存储介质，用于实现提高终端小区切换成功率。
第一方面，本公开实施例提供一种定时提前补偿方法，包括：
目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
可选地，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
可选地，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH(Physical Uplink  Shared Channel，物理层上行共享信道)传输。
可选地，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG(Next Generation，下一代)接口；或
所述核心网设备与所述源基站之间的NG接口。
可选地，所述目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
若所述网络设备间的接口为NG接口，接收核心网发送的所述终端的切换请求，所述切换请求是源基站通过NG接口向核心网发送的；
向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
可选地，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
可选地，若所述目标小区为地面小区，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区的TA补偿值；
所述目标小区的小区类型指示信息。
可选地，若所述目标小区为卫星小区且所述卫星为透传模式卫星，则所述方法还包括，目标基站补偿馈电链路feeder link的传输时延。
第二方面，本公开实施例提供一种定时提前补偿方法，包括：
接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站 的；
基于所述TA补偿相关信息进行上行传输。
可选地，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
可选地，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
可选地，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
可选地，基于所述TA补偿相关信息进行上行传输，包括：
若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时 使用的TA值；
若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在所述目标小区进行上行传输时使用的TA值为0；
基于所述TA值在目标小区进行上行传输。
可选地，所述接收所述源小区归属的源基站发送的TA补偿相关信息，具体为：
接收所述源基站发送的RRC(Radio Resource Control，无线资源控制)重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
第三方面，本公开实施例提供一种定时提前补偿方法，包括：
获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
将所述TA补偿相关信息发送至所述终端。
可选地，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
可选地，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的接口NG接口。
可选地，所述获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口向所述目标基站发送所述终端的切换请求后，接收目标基站通过Xn接口发送的TA补偿相关信息；
若所述网络设备间的接口为NG接口，通过NG接口向核心网发送所述终端的切换请求，以使所述目标基站接收到核心网转发的所述切换请求后向所述核心网发送TA补偿相关信息；
接收核心网通过NG接口发送的TA补偿相关信息。
可选地，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
可选地，将所述TA补偿相关信息发送至所述终端，具体为：
向终端发送RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
第四方面，本公开实施例提供一种基站，包括存储器、收发机和处理器：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
可选地，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
可选地，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
可选地，所述目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
若所述网络设备间的接口为NG接口，接收核心网发送的所述终端的切 换请求，所述切换请求是源基站通过NG接口向核心网发送的；
向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
可选地，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
可选地，若所述目标小区为地面小区，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区的TA补偿值；
所述目标小区的小区类型指示信息。
可选地，若所述目标小区为卫星小区且所述卫星为透传模式卫星，则所述操作还包括，目标基站补偿馈电链路feeder link的传输时延。
第五方面，本公开实施例提供一种终端，包括存储器、收发机和处理器：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
基于所述TA补偿相关信息进行上行传输。
可选地，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
可选地，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
可选地，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
可选地，基于所述TA补偿相关信息进行上行传输，包括：
若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在所述目标小区进行上行传输时使用的TA值为0；
基于所述TA值在目标小区进行上行传输。
可选地，所述接收所述源小区归属的源基站发送的TA补偿相关信息，具体为：
接收所述源基站发送的RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
第六方面，本公开实施例提供一种基站，包括存储器、收发机和处理器：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
将所述TA补偿相关信息发送至所述终端。
可选地，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
可选地，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的接口NG接口。
可选地，所述获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口向所述目标基站发送所述终端的切换请求后，接收目标基站通过Xn接口发送的TA补偿相关信息；
若所述网络设备间的接口为NG接口，通过NG接口向核心网发送所述终端的切换请求，以使所述目标基站接收到核心网转发的所述切换请求后向所述核心网发送TA补偿相关信息；
接收核心网通过NG接口发送的TA补偿相关信息。
可选地，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
可选地，将所述TA补偿相关信息发送至所述终端，具体为：
向终端发送RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
第七方面，本公开实施例提供一种基站，包括：
第一发送模块，用于目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
第八方面，本公开实施例提供一种终端，包括：
接收模块，用于接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
上行传输模块，用于基于所述TA补偿相关信息进行上行传输。
第九方面，本公开实施例提供一种基站，包括：
获取模块，用于获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
第二发送模块，用于将所述TA补偿相关信息发送至所述终端。
第十方面，本公开实施例提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行第一方面所提供的定时提前补偿方法，或者执行第二方面所提供的定时提前补偿方法，或者执行第三方面所提供的定时提前补偿方法。
本公开实施例提供的定时提前补偿方法，通过在终端进行小区切换时，向终端发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本公开一实施例提供的基于Xn接口进行小区切换的流程示意图；
图2是本公开一实施例提供的基于NG接口进行小区切换的流程示意图；
图3是本公开第一实施例提供的定时提前补偿方法流程示意图；
图4是本公开第二实施例提供的定时提前补偿方法流程示意图；
图5是本公开第三实施例提供的定时提前补偿方法流程示意图；
图6是本公开第四实施例提供的定时提前补偿方法流程示意图；
图7是本公开第五实施例提供的定时提前补偿方法流程示意图；
图8是本公开第六实施例提供的定时提前补偿方法流程示意图；
图9是本公开第七实施例提供的定时提前补偿方法流程示意图；
图10是本公开一实施例提供的基站的结构示意图；
图11是本公开一实施例提供的终端的结构示意图；
图12是本公开另一实施例提供的基站的结构示意图；
图13是本公开又一实施例提供的基站的结构示意图；
图14是本公开另一实施例提供的终端的结构示意图；
图15是本公开再一实施例提供的基站的结构示意图。
具体实施方式
本公开实施例中术语“和/或”，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。字符“/”一般表示前后关联对象是一种“或”的关系。
本公开实施例中术语“多个”是指两个或两个以上，其它量词与之类似。
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，并不是全部的实施例。基于本公开中的实施例，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，都属于本公开保护的范围。
本公开实施例提供了定时提前补偿方法及装置，用以保证终端进行小区切换过程中，可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿。
其中，方法和装置是基于同一申请构思的，由于方法和装置解决问题的原理相似，因此装置和方法的实施可以相互参见，重复之处不再赘述。
目前的地面蜂窝网络中的切换，主要是为了给连接态的UE提供连续的稳定的服务。切换主要的场景有：基于UE移动性的切换，基于网络侧负载情况的切换。NR的切换分为基站内切换、基站站间切换、系统间切换等。基站间切换又可以分为Xn切换和NG切换，下面分别进行介绍：
图1是本公开一实施例提供的基于Xn接口进行小区切换的流程示意图；如图1所示，当两个基站之间存在可用的Xn接口，UE在两个基站的覆盖之间移动的时候，可采用Xn切换；
其中，各个步骤的具体描述如下：
步骤100、终端测量上报；
这一步骤包含源小区归属的源基站为连接态终端配置测量配置，当确定满足测量条件，终端执行测量；当满足测量上报条件，终端可以通过测量上报消息向源小区归属的源基站上报测量结果；
步骤110、切换请求；
源小区归属的源基站执行切换判断，若需要执行切换，则源基站可以向目标小区归属的目标基站通过基站间接口(5G系统为Xn接口)发送切换请求消息(5G系统为HANDOVER REQUEST)。
步骤120、切换请求确认；
目标小区归属的目标基站接收到源基站发送的切换请求后，进行接纳判决。如果可以接纳，可以向源小区发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)。
步骤130、RRC重配；
源小区接收到目标小区的切换命令后，可以通过RRC重配过程将切换配置信息通知给终端。
步骤140、RRC重配完成；
所述终端通过向目标小区发送RRC重配完成消息，告知终端的目标小区所述切换过程已完成。其中，RRC重配完成消息有两种发送方式：
如果是RACH-less(Random Access Channel-less，无随机接入)切换，则终端可以利用目标小区在切换命令中分配的PUSCH资源直接发送所述 RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为PUSCH传输。
如果非RACH-less切换，则终端需要先在目标小区发起随机接入过程获取TA值和PUSCH资源，才能发送RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为随机接入的Msg1或者MsgA。
步骤150、路径转换请求；
目标小区向核心网设备发送路径转换请求，以通知核心网设备进行数据路由变更。
步骤160、路径转换请求确认；
目标小区收到核心网回复的数据路由变更确认消息后，通知源小区释放终端的上下文
步骤170、UE上下文释放。
目标小区收到核心网回复的数据路由变更确认消息后，通知源小区释放终端的上下文。
图2是本公开一实施例提供的基于NG接口进行小区切换的流程示意图；如所示，如果两个基站之间没有可用的Xn接口，则可以通过NG接口来完成切换过程，NG切换的流程如下：
步骤200、终端测量上报；
这一步包含源小区归属的源基站为连接态终端配置测量配置，当确定满足测量条件，终端执行测量；当满足测量上报条件，终端可以通过测量上报消息向源基站上报测量结果；
步骤210、切换准备；
源小区归属的源基站执行切换判断，若确定需要执行切换，且确定源小区归属的源基站和目标小区归属的目标基站之间没有直接接口，则源基站可以通过源基站和核心网设备之间的接口(5G系统中为NG接口)发送切换请求消息(5G系统在源基站和核心网设备之间发送的消息名称为切换准备消息：HANDOVER REQUIRED)。
步骤220、切换确认；
核心网设备接收到源基站发送的切换请求后，可以向目标小区归属的目标基站发送切换请求(5G系统中使用HANDOVER REQUEST消息)
步骤230、切换请求确认；
目标小区归属的基站接收到核心网设备发送的切换请求消息后，可以进行接纳判决，如果可以接纳，则向核心网设备发送切换请求确认消息(5G系统中使用HANDOVER REQUEST ACKNOWLEDGE消息)
步骤240、切换命令；
核心网设备向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)。
步骤250、RRC重配；
源基站接收到目标基站的切换命令后，可以通过RRC重配过程将所述切换配置信息通知给终端。
步骤260、RRC重配完成；
所述终端通过向目标小区发送RRC重配完成消息，告知终端的目标小区所述切换过程已完成。其中，RRC重配完成消息有两种发送方式：
如果是RACH-less切换，则终端可以利用目标小区在切换命令中分配的PUSCH资源直接发送所述RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为PUSCH传输。
如果非RACH-less切换，则终端需要先在目标小区发起随机接入过程获取TA值和PUSCH资源，才能发送RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为随机接入的Msg1或者MsgA。
步骤270、切换通知；
当终端成功接入目标小区后，目标小区需要告知核心网终端接入目标小区成功。
步骤280、UE上下文释放；
核心网通知源小区释放上下文。
步骤290、UE上下文释放完成。
源小区向核心网回复确认消息。
对于不同卫星小区之间的切换以及卫星小区和地面小区之间的切换以及不同地面小区之间的切换，对于不同小区终端使用的TA预补偿值可能不同，又由于现有的小区切换时基站间接口不携带TA预补偿相关指示信息，因此可能导致UE接入目标小区时，可能由于TA使用不合理，导致随机接入失败，降低切换成功率。
因此，本公开提出一种在小区切换过程中的定时提前补偿方法，目标小区归属的目标基站通过给终端提供其在目标小区进行上行传输时使用的定时提前TA补偿相关信息，使得终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
图3是本公开第一实施例提供的定时提前补偿方法流程示意图，如图3所示，该方法包括：
步骤300，目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
具体地，上行传输的一个重要特征是不同终端在时频上正交多址接入(orthogonal multiple access)，即来自同一小区的不同UE的上行传输之间互不干扰。为了保证上行传输的正交性，避免小区内(intra-cell)干扰，基站要求来自同一子帧但不同频域资源(不同的RB)的不同终端的信号到达基站的时间基本上是对齐的。为了保证基站侧的时间同步，提出了上行定时提前(Uplink Timing Advance)的机制。在终端侧看来，定时提前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)。基站通过适当地控制每个终端的偏移，可以控制来自不同终端的上行信号到达基站的时间。对于离基站较远的终端，由于有较大的传输延迟，就要比离基站较近的UE提前发送上行数据。
但是，在终端在准备切换至目标小区时，其可以终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息是未知的，因此，在终端进行小区切换时，目标小区归属的目标基站可以通过网络接口向源小区归属的源基 站发送携带有终端在目标小区进行上行传输时可以使用的定时提前TA补偿相关信息，源小区归属的源基站获取TA补偿相关信息后，在终端从源小区向目标小区进行切换的过程中，将TA补偿相关信息发送至终端，终端可以基于TA补偿相关信息确定其在目标小区进行上行传输时使用的TA值，并基于该TA值进行上行传输，比如基于该TA值进行第一次上行传输。
本公开实施例提供的定时提前补偿方法，通过在终端进行小区切换时，向终端发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
可选地，在上述各实施例中，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
具体地，本实施例中，源小区可以是地面小区或卫星小区；同样地，目标小区也可以是地面小区或卫星小区；
具体地，本实施例适用场景可以是但不限于：终端从一个卫星小区切换到另一个卫星小区、终端从地面小区切换到卫星小区、终端从卫星小区切换到地面小区、以及终端从一个地面小区切换至另一个地面小区。
可选地，在上述各实施例中，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
具体地，由于在终端准备切换至目标小区但还未接入成功时，其可以在目标小区进行上行传输时使用的TA补偿相关信息是未知的，但接入成功以后上行传输所使用的TA补偿相关信息是基于终端在目标小区第一次传输使用的TA的增量调整。因此，本实施例中，终端在目标小区进行上行传输时使用的TA补偿相关信息实际上可以认为是，终端在目标小区进行第一次上行传输时使用的TA补偿相关信息，具体地，终端在目标小区进行第一次上行传输可以是终端在目标小区发起的随机接入过程的第一条消息或终端在目 标小区的第一条PUSCH传输。
可选地，在上述各实施例中，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
具体地，网络接口可以是如下接口之一：
源基站和目标基站之间的直接接口，比如5G系统的Xn接口；或目标基站和核心网设备之间的接口以及网络设备和源基站之间的接口，比如5G系统的NG接口；分别对应基站间切换的Xn切换和NG切换。
因此，本实施例中，不论是源基站和目标基站之间是否有直接接口，均可以实现目标小区归属的目标基站将TA补偿相关信息传输给源基站，以使源小区将TA补偿相关信息发送给终端完成上行传输。
可选地，在上述各实施例中，所述目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
具体地，若网络设备间的接口为Xn接口，即若源基站和目标基站之间有直接接口，则目标小区归属的目标基站可以通过Xn接口直接将终端在目标小区进行上行传输时使用的TA补偿相关信息发送给源小区归属的源基站。
具体地，源基站在确定需要执行小区切换后，会向目标小区归属的目标基站通过Xn发送切换请求消息(5G系统为HANDOVER REQUEST)，目标基站在通过Xn接口接收源基站发送的终端的切换请求后，进行接纳判决，如果确认可以接纳该终端，则可以通过Xn接口直接将TA补偿相关信息发送给源小区归属的源基站；例如，向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)，该切换命令中携带TA补偿相关信息。
若所述网络设备间的接口为NG接口，目标基站接收核心网发送的所述 终端的切换请求，所述切换请求是源基站通过NG接口向核心网发送的；
目标基站向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
具体地，若网络设备间的接口为NG接口，即若源基站和目标基站之间没有直接接口，则目标基站在向源基站发送TA补偿相关信息时，需要通过与核心网设备之间的NG接口发送至核心网设备，再由核心网设备转发至源基站；
具体地，源基站在确定需要执行小区切换后，且确认源小区和目标基站之间没有直接接口，则源小区通过源小区归属的源基站和核心网设备之间的接口(5G系统中为NG接口)向核心网设备发送切换请求消息(5G系统在源小区归属的源基站和核心网设备之间发送的消息名称为切换准备消息：HANDOVER REQUIRED)。核心网设备接收到源基站发送的切换请求后，向目标小区归属的目标基站发送切换请求(5G系统中使用HANDOVER REQUEST消息)；目标小区归属的目标基站在接收到核心网发送的终端的切换请求后，进行接纳判决，如果确认可以接纳该终端，则可以向核心网设备发送TA补偿相关信息，例如，向核心网设备发送切换请求确认消息(5G系统中使用HANDOVER REQUEST ACKNOWLEDGE消息)，该切换确认消息中携带TA补偿相关信息；核心网接收到后通过与源小区归属的源基站之间的NG接口将TA补偿相关信息转发至源小区归属的源基站，例如核心网设备向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)，该切换确认消息中携带TA补偿相关信息；
可选地，在上述各实施例中，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫 星小区。
具体地，TA补偿相关信息可以是以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
可以理解的是，目标小区归属的目标基站将TA补偿相关信息提供给终端后，终端可以基于不同的TA补偿相关信息，分别通过不同的方式确定其在目标小区进行上行传输时使用的TA值，并基于该TA值进行上行传输。
可选地，在上述各实施例中，若所述目标小区为地面小区，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区的TA补偿值；
所述目标小区的小区类型指示信息。
具体地，若所述目标小区为地面小区，则在计算提前定时补偿时，可以参考的因素为所述目标小区的TA补偿值和/或所述目标小区的小区类型指示信息。
可选地，在上述各实施例中，若所述目标小区为卫星小区且所述卫星为透传模式卫星，则所述方法还包括，目标小区归属的目标基站补偿馈电链路feeder link的传输时延。
具体地，本实施例中，不论TA补偿相关信息是哪一类信息，若目标小区为卫星小区且该卫星为透传模式卫星，则在终端进行第一次上行传输时，目标基站可以自行补偿馈电链路feeder link的传输时延。
图4是本公开第二实施例提供的定时提前补偿方法流程示意图，如图4所示，该方法包括：
步骤400，接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的 源基站的；
具体地，终端在准备切换至目标小区时，其可以在目标小区进行上行传输使用的定时提前TA补偿相关信息是未知的，因此，终端在进行小区切换时，可以接收源小区发送的TA补偿相关信息，其中，该TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
具体地，目标小区归属的目标基站通过网络接口向源小区归属的源基站发送携带有在目标小区进行上行传输使用的定时提前TA补偿相关信息，源小区归属的源基站获取TA补偿相关信息后，在终端从源小区向目标小区进行切换的过程中，将TA补偿相关信息发送至终端。比如通过RRC重配信令发送给终端。
步骤410，基于所述TA补偿相关信息进行上行传输。
具体地，终端接收到源小区发送的TA补偿相关信息后，可以基于TA补偿相关信息确定其在目标小区进行上行传输时使用的TA值，并基于该TA值进行上行传输，比如基于该TA值进行第一次上行传输。
本公开实施例提供的定时提前补偿方法，通过在进行小区切换时，接收目标基站提供的终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
可选地，在上述各实施例中，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
具体地，本实施例中，源小区可以是地面小区或卫星小区；同样地，目标小区也可以是地面小区或卫星小区；
具体地，本实施例适用场景可以是但不限于：终端从一个卫星小区切换到另一个卫星小区、终端从地面小区切换到卫星小区、终端从卫星小区切换到地面小区、以及终端从一个地面小区切换至另一个地面小区。
可选地，在上述各实施例中，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
具体地，由于在终端在准备切换至目标小区但还未接入成功时，其可以在目标小区进行上行传输时使用的TA补偿相关信息是未知的，但接入成功以后上行传输所使用的TA补偿相关信息是基于终端在目标小区第一次传输使用的TA的增量调整。因此，本实施例中，终端在目标小区进行上行传输时使用的TA补偿相关信息实际上可以认为是终端在目标小区进行第一次上行传输使用的TA补偿相关信息，具体地，终端在目标小区第一次上行传输可以是终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，在上述各实施例中，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
具体地，网络接口可以是如下接口之一：
源基站和目标基站之间的直接接口，比如5G系统的Xn接口；或目标基站和核心网设备之间的接口以及网络设备和源基站之间的接口，比如5G系统的NG接口；分别对应基站间切换的Xn切换和NG切换。
因此，本实施例中，不论是源基站和目标基站之间是否有直接接口，终端均可以获取目标基站提供的TA补偿相关信息，即均可以实现目标基站将TA补偿相关信息传输给源基站，源小区将TA补偿相关信息发送给终端这一过程。
可选地，在上述各实施例中，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
具体地，TA补偿相关信息可以是以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区；
例如，TA补偿相关信息可以是目标小区馈电链路feeder link的传输时延与星历信息的组合，终端可以基于这一信息组合确定其在所述目标小区进行上行传输时使用的TA值。
可选地，在上述各实施例中，基于所述TA补偿相关信息进行上行传输，包括：
若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在 所述目标小区进行上行传输时使用的TA值为0；
基于所述TA值在目标小区进行上行传输。
具体地，终端从接收到TA补偿相关信息后，可以基于TA相关补偿信息确定终端在目标小区进行第一次上行传输使用的TA值。其中上行传输可以是：随机接入的Msg1(message1)或者MsgA(messageA)或者PUSCH传输。
具体地，目标小区归属的目标基站将TA补偿相关信息提供给终端后，终端可以基于不同的TA补偿相关信息，可以分别通过不同的方式确定其在目标小区进行上行传输时使用的TA值，并基于该TA值进行上行传输。
具体地，若TA相关补偿信息的内容为“目标小区馈电链路feeder link的传输时延”，则终端可以根据自身的位置信息、星历信息以及目标小区馈电链路feeder link的传输时延三者可以确定其在目标小区进行上行传输时使用的TA值；其中，终端使用的星历信息可以是终端预存的，也可以是目标小区归属的目标基站提供的。
若所述TA相关补偿信息的内容为“目标小区的TA补偿值”，则终端可以将该TA补偿值直接确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“星历信息”，则终端可以根据自身的位置信息、星历信息确定其在目标小区进行上行传输时使用的TA值，其中，Feeder link的时延则由卫星补偿。
若所述TA相关补偿信息的内容为“所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息”，则终端可以根据自身的位置信息、目标小区参考点的位置信息确定目标小区TA和终端自身TA的差值delta，然后计算TA1＝目标小区对应的TA值+delta，并将TA1取值确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“目标小区的小区类型指示信息”，则终端如果确定目标小区是TN小区，则确定在所述目标小区进行上行传输时使用的TA值为0。
可选地，在上述各实施例中，所述接收所述源小区归属的源基站发送的 TA补偿相关信息，具体为：
接收所述源基站发送的RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
具体地，源小区归属的源基站接收到目标小区归属的目标基站发送的切换命令后，可以通过RRC重配过程将所述切换配置信息通知给终端，其中RRC重配消息中包括终端在目标小区的TA补偿相关信息。
本公开实施例提供的定时提前补偿方法，通过在进行小区切换时，接收目标小区归属的目标基站提供的终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
图5是本公开第三实施例提供的定时提前补偿方法流程示意图，如图5所示，该方法包括：
步骤500，获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
具体地，在终端在准备从源小区切换至目标小区时，终端可以在目标小区进行上行传输时使用的定时提前TA补偿相关信息是未知的，因此，源小区归属的源基站可以获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息，将该TA补偿相关信息提供给终端，以使终端基于该TA补偿相关信息完成上行传输；
具体地，在终端进行小区切换时，目标小区归属的目标基站通过网络接口向源小区归属的源基站发送携带有终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，源小区归属的源基站获取TA补偿相关信息。
步骤510，将所述TA补偿相关信息发送至所述终端。
具体地，源小区归属的源基站获取TA补偿相关信息后，可以在终端从源小区向目标小区进行切换的过程中，将TA补偿相关信息发送至终端，终端可以基于TA补偿相关信息确定其在目标小区进行上行传输时使用的TA值，并基于该TA值进行上行传输，比如基于该TA值进行第一次上行传输。
本公开实施例提供的定时提前补偿方法，通过在终端进行小区切换时，接收目标基站提供的终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，并发送给终端，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
可选地，在上述各实施例中，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
具体地，本实施例中，源小区可以是地面小区或卫星小区；同样地，目标小区也可以是地面小区或卫星小区；
具体地，本实施例适用场景可以是但不限于：终端从一个卫星小区切换到另一个卫星小区、终端从地面小区切换到卫星小区、终端从卫星小区切换到地面小区、以及终端从一个地面小区切换至另一个地面小区。
可选地，在上述各实施例中，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
具体地，由于在终端在准备切换至目标小区但还未接入成功时，其可以在目标小区进行上行传输时使用的TA补偿相关信息是未知的，但接入成功以后上行传输所使用的TA补偿相关信息是基于在目标小区进行第一次传输时使用的TA的增量调整。因此，本实施例中，终端在目标小区进行上行传输时使用的TA补偿相关信息实际上可以认为是终端在目标小区进行第一次上行传输使用的TA补偿相关信息，具体地，终端在目标小区进行第一次上行传输可以是终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
可选地，在上述各实施例中，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的接口NG接口。
具体地，网络接口可以是如下接口之一：
源基站和目标基站之间的直接接口，比如5G系统的Xn接口；或目标基站和核心网设备之间的接口以及网络设备和源基站之间的接口，比如5G系统的NG接口；分别对应基站间切换的Xn切换和NG切换。
因此，本实施例中，不论是源基站和目标基站之间是否有直接接口，均可以实现目标基站将TA补偿相关信息传输给源基站，以使源小区将TA补偿相关信息发送给终端。
可选地，在上述各实施例中，所述获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口向所述目标基站发送所述终端的切换请求后，接收目标基站通过Xn接口发送的TA补偿相关信息；
具体地，若网络设备间的接口为Xn接口，即若源基站和目标基站之间有直接接口，则源小区归属的源基站可以通过Xn接口直接从目标基站获取终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息；即目标基站可以通过Xn接口直接将TA补偿相关信息发送给源小区归属的源基站。
具体地，源基站在确定需要执行小区切换后，会向目标小区归属的目标基站通过Xn发送切换请求消息(5G系统为HANDOVER REQUEST)，目标基站在通过Xn接口接收源基站发送的终端的切换请求后，进行接纳判决，如果确认可以接纳该终端，则可以通过Xn接口直接将TA补偿相关信息发送给源小区归属的源基站；例如，向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)，该切换命令中携带TA补偿相关信息。
若所述网络设备间的接口为NG接口，通过NG接口向核心网发送所述终端的切换请求，以使所述目标基站接收到核心网转发的所述切换请求后向所述核心网发送TA补偿相关信息；
接收核心网通过NG接口发送的TA补偿相关信息。
具体地，若网络设备间的接口为NG接口，即若源基站和目标基站之间没有直接接口，则目标小区归属的目标基站在向源基站发送TA补偿相关信息时，需要通过与核心网设备之间的NG接口转发至源基站；
具体地，源小区归属的源基站在确定需要执行小区切换后，且确认源小区和目标基站之间没有直接接口，则源小区通过源小区和核心网设备之间的接口(5G系统中为NG接口)向核心网设备发送切换请求消息(5G系统在源小区和核心网设备之间发送的消息名称为切换准备消息：HANDOVER REQUIRED)。核心网设备接收到源小区归属的源基站发送的切换请求后，向目标小区归属的目标基站发送切换请求(5G系统中使用HANDOVER REQUEST消息)；目标基站在接收到核心网发送的终端的切换请求后，进行接纳判决，如果确认可以接纳该终端，则可以向核心网设备发送TA补偿相关信息，例如，向核心网设备发送切换请求确认消息(5G系统中使用HANDOVER REQUEST ACKNOWLEDGE消息)，该切换确认消息中携带TA补偿相关信息；核心网接收到后通过与源小区归属的源基站之间的NG接口将TA补偿相关信息转发至源小区归属的源基站，例如核心网设备向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)，该切换确认消息中携带TA补偿相关信息；
可选地，在上述各实施例中，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
具体地，TA补偿相关信息可以是以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
可以理解的是，源小区归属的源基站在将从目标小区归属的目标基站获取到的TA补偿相关信息传输给终端后，终端可以基于不同的TA补偿相关信息，可以分别通过不同的方式确定其在目标小区进行上行传输时使用的TA值，并基于该TA值进行上行传输。
可选地，在上述各实施例中，将所述TA补偿相关信息发送至所述终端，具体为：
向终端发送RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
具体地，源小区归属的源基站接收到目标基站发送的切换命令后，可以通过RRC重配过程将所述切换配置信息通知给终端，其中RRC重配消息中包括终端在目标小区的TA补偿相关信息。
本公开实施例提供的定时提前补偿方法，通过在终端进行小区切换时，接收目标基站提供的终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，并发送给终端，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
图6是本公开第四实施例提供的定时提前补偿方法流程示意图，本公开实施例适用场景包括但不限于：终端从一个卫星小区切换到另一个卫星小区、终端从地面小区切换到卫星小区；如图6所示，该方法包括：
步骤600，终端测量上报；
具体地，源小区归属的源基站为连接态终端配置测量配置，当满足测量条件，终端执行测量；当满足测量上报条件，终端通过测量上报消息向源基站上报测量结果；
步骤610，切换请求；
具体地，源小区归属的源基站执行切换判断，若需要执行切换，则为终端服务的源基站会向目标小区归属的目标基站通过基站间接口(5G系统为Xn接口)发送切换请求消息(5G系统为HANDOVER REQUEST)。
步骤620，切换请求确认；
具体地，目标基站接收到源小区归属的源基站发送的切换请求后，进行接纳判决。如果可以接纳，则向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)。
其中，该切换命令中需要携带所述终端在目标小区进行上行传输时使用的TA补偿相关信息，所述终端在目标小区进行上行传输时使用的TA补偿相关信息可以包括如下之一或者组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
步骤630，RRC重配；
具体地，源小区归属的源基站接收到目标基站的切换命令后，通过RRC重配过程将所述切换配置信息通知给终端。其中，RRC重配消息中至少需要包含步骤620中的TA补偿相关信息。
步骤640，RRC重配完成；
具体地，终端通过向目标小区发送RRC重配完成消息，告知终端的目标小区所述切换过程已完成。其中，RRC重配完成消息有两种发送方式：
如果是RACH-less切换，则终端可以利用目标小区在切换命令中分配的PUSCH资源直接发送所述RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为PUSCH传输。
如果非RACH-less切换，则终端需要先在目标小区发起随机接入过程获取TA值和PUSCH资源，才能发送RRC重配完成消息，即终端在所述目标 小区进行的第一次上行传输为随机接入的Msg1或者MsgA。
可以理解的是，本实施例中，终端在发送RRC重配完成消息时，不管是RACH-less切换还是非RACH-less切换，终端均可以通过本公开实施例提出的方案获取TA补偿相关信息。
本实施例中，所述终端接收到TA补偿相关信息后，可以基于所述TA相关补偿信息确定其在目标小区进行第一次上行传输使用的TA。该上行传输可以是上面提到的：随机接入的Msg1或者MsgA或者PUSCH传输。
其中，所述终端基于TA相关补偿信息确定终端在目标小区进行第一次上行传输使用的TA值的具体方式可以是但不限于以下任意一项或其组合：
具体地，若TA相关补偿信息的内容为“目标小区馈电链路feeder link的传输时延”，则终端可以根据自身的位置信息、星历信息以及目标小区馈电链路feeder link的传输时延三者可以确定其在目标小区进行上行传输时使用的TA值；其中，终端使用的星历信息可以是终端预存的。
若所述TA相关补偿信息的内容为“目标小区的TA补偿值”，则终端可以将该TA补偿值直接确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“星历信息”，则终端可以根据自身的位置信息、星历信息确定其在目标小区进行上行传输时使用的TA值，其中，Feeder link的时延则由卫星补偿。
若所述TA相关补偿信息的内容为“所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息”，则终端可以根据自身的位置信息、目标小区参考点的位置信息确定目标小区TA和终端自身TA的差值delta，然后计算TA1＝目标小区对应的TA值+delta，并将TA1取值确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“目标小区的小区类型指示信息”，则终端如果确定目标小区是TN小区，则确定在所述目标小区进行上行传输时使用的TA值为0。
步骤650，路径转换请求；
具体地，目标小区向核心网设备发送路径转换请求，以通知核心网设备 进行数据路由变更。
步骤660，路径转换请求响应；
具体地，核心网设备向目标小区发送路径转换确认消息。
步骤670，UE上下文释放。
具体地，目标小区收到核心网回复的数据路由变更确认消息后，通知源小区释放终端的上下文。
图7是本公开第五实施例提供的定时提前补偿方法流程示意图，本公开实施例适用场景包括但不限于：终端从一个卫星小区切换到另一个卫星小区、终端从地面小区切换到卫星小区；如图7所示，该方法包括：
步骤700，终端测量上报；
具体地，源小区归属的源基站为连接态终端配置测量配置，当满足测量条件，终端执行测量；当满足测量上报条件，终端通过测量上报消息向源基站上报测量结果；
步骤710，切换准备；
具体地，源小区归属的源基站执行切换判断，若需要执行切换，且源基站和目标基站之间没有直接接口，则源小区归属的源基站通过源基站和核心网设备之间的接口(5G系统中为NG接口)向核心网发送切换请求消息(5G系统在源小区和核心网设备之间发送的消息名称为切换准备消息：HANDOVER REQUIRED)。
步骤720，切换请求；
具体地，核心网设备接收到源小区归属的源基站发送的终端的切换请求后，向目标基站发送切换请求(5G系统中使用HANDOVER REQUEST消息)。
步骤730，切换请求确认；
具体地，目标小区归属的目标基站接收到核心网设备通过NG接口发送的切换请求后，进行接纳判决。如果可以接纳，则向核心网设备发送切换请求确认消息(5G系统中使用HANDOVER REQUEST ACKNOWLEDGE消息)。
其中，该切换请求确认消息中需要携带所述终端在目标小区进行上行传 输时使用的TA补偿相关信息，所述终端在目标小区进行上行传输时使用的TA补偿相关信息可以包括如下之一或者组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
步骤740，切换命令；
具体地，核心网设备向源小区归属的源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)。
其中，该切换命令中可以携带所述终端在目标小区进行上行传输时使用的TA补偿相关信息，
步骤750，RRC重配；
具体地，源小区归属的源基站接收到目标小区归属的目标基站的切换命令后，通过RRC重配过程将所述切换配置信息通知给终端。其中，RRC重配消息中至少需要包含步骤740中的TA补偿相关信息。
步骤760，RRC重配完成；
具体地，终端通过向目标小区发送RRC重配完成消息，告知终端的目标小区所述切换过程已完成。其中，RRC重配完成消息有两种发送方式：
如果是RACH-less切换，则终端可以利用目标小区在切换命令中分配的PUSCH资源直接发送所述RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为PUSCH传输。
如果非RACH-less切换，则终端需要先在目标小区发起随机接入过程获取TA值和PUSCH资源，才能发送RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为随机接入的Msg1或者MsgA。
本实施例中，所述终端接收到TA补偿相关信息后，可以基于所述TA相关补偿信息确定其在目标小区进行第一次上行传输使用的TA。该上行传输可 以是上面提到的：随机接入的Msg1或者MsgA或者PUSCH传输。
其中，所述终端基于TA相关补偿信息确定终端在目标小区进行第一次上行传输使用的TA值的具体方式可以是但不限于以下任意一项或其组合：
具体地，若TA相关补偿信息的内容为“目标小区馈电链路feeder link的传输时延”，则终端可以根据自身的位置信息、星历信息以及目标小区馈电链路feeder link的传输时延三者可以确定其在目标小区进行上行传输时使用的TA值；其中，终端使用的星历信息可以是终端预存的。
若所述TA相关补偿信息的内容为“目标小区的TA补偿值”，则终端可以将该TA补偿值直接确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“星历信息”，则终端可以根据自身的位置信息、星历信息确定其在目标小区进行上行传输时使用的TA值，其中，Feeder link的时延则由卫星补偿。
若所述TA相关补偿信息的内容为“所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息”，则终端可以根据自身的位置信息、目标小区参考点的位置信息确定目标小区TA和终端自身TA的差值delta，然后计算TA1＝目标小区对应的TA值+delta，并将TA1取值确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“目标小区的小区类型指示信息”，则终端如果确定目标小区是TN小区，则确定在所述目标小区进行上行传输时使用的TA值为0。
步骤770，切换通知；
具体地，当终端成功接入目标小区后，目标小区需要告知核心网终端接入目标小区成功。
步骤780，在终端上下文释放；
具体地，核心网通知源小区释放上下文。
步骤790，终端上下文释放完成。
具体地，源小区向核心网回复确认消息。
图8是本公开第六实施例提供的定时提前补偿方法流程示意图，本公开 实施例适用场景包括但不限于：终端从卫星小区切换地面小区，或从一个地面小区切换到另一个地面小区；如图8所示，该方法包括：
步骤800，终端测量上报；
具体地，源小区归属的源基站为连接态终端配置测量配置，当满足测量条件，终端执行测量；当满足测量上报条件，终端通过测量上报消息向源基站上报测量结果；
步骤810，切换请求；
具体地，源小区归属的源基站执行切换判断，若需要执行切换，则为终端服务的源基站会向目标小区归属的目标基站通过基站间接口(5G系统为Xn接口)发送切换请求消息(5G系统为HANDOVER REQUEST)。
步骤820，切换请求确认；
具体地，目标小区归属的目标基站接收到源小区归属的源基站发送的切换请求后，进行接纳判决。如果可以接纳，则向源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)。
其中，该切换命令中需要携带所述终端在目标小区进行上行传输时使用的TA补偿相关信息，所述终端在目标小区进行上行传输时使用的TA补偿相关信息可以包括如下之一或者组合：
所述目标小区的TA补偿值；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
步骤830，RRC重配；
具体地，源小区归属的源基站接收到目标小区归属的目标基站的切换命令后，通过RRC重配过程将所述切换配置信息通知给终端。其中，RRC重配消息中至少需要包含步骤620中的TA补偿相关信息。
步骤840，RRC重配完成；
具体地，终端通过向目标小区发送RRC重配完成消息，告知终端的目标小区所述切换过程已完成。其中，RRC重配完成消息有两种发送方式：
如果是RACH-less切换，则终端可以利用目标小区在切换命令中分配的 PUSCH资源直接发送所述RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为PUSCH传输。
如果非RACH-less切换，则终端需要先在目标小区发起随机接入过程获取TA值和PUSCH资源，才能发送RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为随机接入的Msg1或者MsgA。
本实施例中，所述终端接收到TA补偿相关信息后，可以基于所述TA相关补偿信息确定其在目标小区进行第一次上行传输使用的TA。该上行传输可以是上面提到的：随机接入的Msg1或者MsgA或者PUSCH传输。
其中，所述终端基于TA相关补偿信息确定终端在目标小区进行第一次上行传输使用的TA值的具体方式可以是但不限于以下任意一项或其组合：
若所述TA相关补偿信息的内容为“目标小区的TA补偿值”，则终端可以将该TA补偿值直接确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“目标小区的小区类型指示信息”，则终端如果确定目标小区是TN小区，则确定在所述目标小区进行上行传输时使用的TA值为0。
步骤850，路径转换请求；
具体地，目标小区向核心网设备发送路径转换请求，以通知核心网设备进行数据路由变更。
步骤860，路径转换请求响应；
具体地，核心网设备向目标小区发送路径转换确认消息。
步骤870，终端上下文释放。
具体地，目标小区收到核心网回复的数据路由变更确认消息后，通知源小区释放终端的上下文。
图9是本公开第七实施例提供的定时提前补偿方法流程示意图，本公开实施例适用场景包括但不限于：终端从卫星小区切换地面小区，或从一个地面小区切换到另一个地面小区；如图9所示，该方法包括：
步骤900，终端测量上报；
具体地，源小区归属的源基站为连接态终端配置测量配置，当满足测量 条件，终端执行测量；当满足测量上报条件，终端通过测量上报消息向源基站上报测量结果；
步骤910，切换准备；
具体地，源小区归属的源基站执行切换判断，若需要执行切换，且源基站和目标基站之间没有直接接口，则源基站通过源基站和核心网设备之间的接口(5G系统中为NG接口)向核心网发送切换请求消息(5G系统在源小区和核心网设备之间发送的消息名称为切换准备消息：HANDOVER REQUIRED)。
步骤920，切换请求；
具体地，核心网设备接收到源基站发送的终端的切换请求后，向目标基站发送切换请求(5G系统中使用HANDOVER REQUEST消息)。
步骤930，切换请求确认；
具体地，目标小区归属的目标基站接收到核心网设备通过NG接口发送的切换请求后，进行接纳判决。如果可以接纳，则向核心网设备发送切换请求确认消息(5G系统中使用HANDOVER REQUEST ACKNOWLEDGE消息)。
其中，该切换请求确认消息中需要携带所述终端在目标小区进行上行传输时使用的TA补偿相关信息，所述终端在目标小区进行上行传输时使用的TA补偿相关信息可以包括如下之一或者组合：
所述目标小区的TA补偿值；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
步骤940，切换命令；
具体地，核心网设备向源小区归属的源基站发送切换命令(5G系统中具体消息为HANDOVER REQUEST ACKNOWLEDGE)。
其中，该切换命令中可以携带所述终端在目标小区进行上行传输时使用的TA补偿相关信息，
步骤950，RRC重配；
具体地，源小区归属的源基站接收到目标小区归属的目标基站的切换命令后，通过RRC重配过程将所述切换配置信息通知给终端。其中，RRC重配消息中至少需要包含步骤940中的TA补偿相关信息。
步骤960，RRC重配完成；
具体地，终端通过向目标小区发送RRC重配完成消息，告知终端的目标小区所述切换过程已完成。其中，RRC重配完成消息有两种发送方式：
如果是RACH-less切换，则终端可以利用目标小区在切换命令中分配的PUSCH资源直接发送所述RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为PUSCH传输。
如果非RACH-less切换，则终端需要先在目标小区发起随机接入过程获取TA值和PUSCH资源，才能发送RRC重配完成消息，即终端在所述目标小区进行的第一次上行传输为随机接入的Msg1或者MsgA。
本实施例中，所述终端接收到TA补偿相关信息后，可以基于所述TA相关补偿信息确定其在目标小区进行第一次上行传输使用的TA。该上行传输可以是上面提到的：随机接入的Msg1或者MsgA或者PUSCH传输。
其中，所述终端基于TA相关补偿信息确定终端在目标小区进行第一次上行传输使用的TA值的具体方式可以是但不限于以下任意一项或其组合：
若所述TA相关补偿信息的内容为“目标小区的TA补偿值”，则终端可以将该TA补偿值直接确定为其在目标小区进行上行传输时使用的TA值。
若所述TA相关补偿信息的内容为“目标小区的小区类型指示信息”，则终端如果确定目标小区是TN小区，则确定在所述目标小区进行上行传输时使用的TA值为0。
步骤970，切换通知；
具体地，当终端成功接入目标小区后，目标小区需要告知核心网终端接入目标小区成功。
步骤980，在终端上下文释放；
具体地，核心网通知源小区释放上下文。
步骤990，终端上下文释放完成。
具体地，源小区向核心网回复确认消息。
本公开实施例提供的技术方案可以适用于多种系统，尤其是5G系统。例如适用的系统可以是全球移动通讯(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)通用分组无线业务(general packet radio service，GPRS)系统、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)系统、高级长期演进(long term evolution advanced，LTE-A)系统、通用移动系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)系统、5G新空口(New Radio,NR)系统等。这多种系统中均包括终端设备和网络设备。系统中还可以包括核心网部分，例如演进的分组系统(Evloved Packet System,EPS)、5G系统(5GS)等。
本公开实施例涉及的终端，可以是指向用户提供语音和/或数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备等。在不同的系统中，终端的名称可能也不相同，例如在5G系统中，终端可以称为用户设备(User Equipment，UE)。无线终端设备可以经无线接入网(Radio Access Network,RAN)与一个或多个核心网(Core Network,CN)进行通信，无线终端设备可以是移动终端设备，如移动电话(或称为“蜂窝”电话)和具有移动终端设备的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(Personal Communication Service，PCS)电话、无绳电话、会话发起协议(Session Initiated Protocol，SIP)话机、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal Digital Assistant，PDA)等设备。无线终端设备也可以称为系统、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、移动台(mobile)、远程站(remote station)、接入点(access point)、远程终端设备(remote  terminal)、接入终端设备(access terminal)、用户终端设备(user terminal)、用户代理(user agent)、用户装置(user device)，本公开实施例中并不限定。
本公开实施例涉及的基站，该基站可以包括多个为终端提供服务的小区。根据具体应用场合不同，基站又可以称为接入点，或者可以是接入网中在空中接口上通过一个或多个扇区与无线终端设备通信的设备，或者其它名称。基站可用于将收到的空中帧与网际协议(Internet Protocol，IP)分组进行相互更换，作为无线终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)通信网络。基站还可协调对空中接口的属性管理。例如，本公开实施例涉及的网络设备可以是全球移动通信系统(Global System for Mobile communications，GSM)或码分多址接入(Code Division Multiple Access，CDMA)中的网络设备(Base Transceiver Station，BTS)，也可以是带宽码分多址接入(Wide-band Code Division Multiple Access，WCDMA)中的网络设备(NodeB)，还可以是长期演进(long term evolution，LTE)系统中的演进型网络设备(evolutional Node B，eNB或e-NodeB)、5G网络架构(next generation system)中的5G基站(gNB)，也可以是家庭演进基站(Home evolved Node B，HeNB)、中继节点(relay node)、家庭基站(femto)、微微基站(pico)等，本公开实施例中并不限定。在一些网络结构中，基站可以包括集中单元(centralized unit，CU)节点和分布单元(distributed unit，DU)节点，集中单元和分布单元也可以地理上分开布置。
图10是本公开一实施例提供的基站的结构示意图，如图10所示，所述基站包括存储器1001、收发机1002和处理器1003，其中：
存储器1001用于存储计算机程序；收发机1002用于在所述处理器的控制下收发数据；处理器1003用于读取所述存储器中的计算机程序并执行以下操作：
目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
收发机1002，用于在处理器1003的控制下接收和发送数据。
其中，在图10中，总线架构可以包括任意数量的互联的总线和桥，具体 由处理器1003代表的一个或多个处理器和存储器1002代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1002可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器1003负责管理总线架构和通常的处理，存储器1001可以存储处理器1003在执行操作时所使用的数据。
处理器1003可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
在此需要说明的是，本公开实施例提供的上述装置，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
若所述网络设备间的接口为NG接口，接收核心网发送的所述终端的切换请求，所述切换请求是源基站通过NG接口向核心网发送的；
向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，若所述目标小区为地面小区，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区的TA补偿值；
所述目标小区的小区类型指示信息。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，若所述目标小区为卫星小区且所述卫星为透传模式卫星，则所述操作还包括，目标基站补偿馈电链路feeder link的传输时延。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
图11是本公开一实施例提供的终端的结构示意图，如图11所示，所述基站包括存储器1101、收发机1102和处理器1103，其中：
存储器1101用于存储计算机程序；收发机1102用于在所述处理器的控制下收发数据；处理器1103用于读取所述存储器中的计算机程序并执行以下操作：
接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
基于所述TA补偿相关信息进行上行传输。
收发机1102，用于在处理器1103的控制下接收和发送数据。
其中，在图11中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1103代表的一个或多个处理器和存储器1101代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1102可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括，这些传输介质包括无线信道、有线信道、光缆等传输介 质。针对不同的用户设备，用户接口1104还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器1103负责管理总线架构和通常的处理，存储器1101可以存储处理器1103在执行操作时所使用的数据。
可选的，处理器1103可以是CPU(中央处埋器)、ASIC(Application Specific Integrated Circuit，专用集成电路)、FPGA(Field－Programmable Gate Array，现场可编程门阵列)或CPLD(Complex Programmable Logic Device，复杂可编程逻辑器件)，处理器也可以采用多核架构。
处理器通过调用存储器存储的计算机程序，用于按照获得的可执行指令执行本公开实施例提供的任一项所述方法。处理器与存储器也可以物理上分开布置。
在此需要说明的是，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
具体来说，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
具体来说，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的NG接口。
具体来说，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
具体来说，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，基于所述TA补偿相关信息进行上行传输，包括：
若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时使用的TA值；
若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在所述目标小区进行上行传输时使用的TA值为0；
基于所述TA值在目标小区进行上行传输。
具体来说，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述接收所述源小区归属的源基站发送的TA补偿相关信息，具体为：
接收所述源基站发送的RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
具体来说，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
图12是本公开另一实施例提供的基站的结构示意图，如图12所示，所述基站包括存储器1201、收发机1202和处理器1203，其中：
存储器1201用于存储计算机程序；收发机1002用于在所述处理器的控制下收发数据；处理器1203用于读取所述存储器中的计算机程序并执行以下操作：
获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
将所述TA补偿相关信息发送至所述终端。
收发机1202，用于在处理器1203的控制下接收和发送数据。
其中，在图12中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1203代表的一个或多个处理器和存储器1201代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1202可以是多个元件， 即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。处理器1203负责管理总线架构和通常的处理，存储器1201可以存储处理器1203在执行操作时所使用的数据。
处理器1203可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
在此需要说明的是，本公开实施例提供的上述装置，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述源小区或目标小区为以下任一类型的小区：
地面小区；
卫星小区。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述网络设备间的接口为：
源基站和目标基站之间的直接接口Xn接口；或
目标基站与核心网设备之间的NG接口；或
所述核心网设备与所述源基站之间的接口NG接口。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所 实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息，包括：
若所述网络设备间的接口为Xn接口，通过Xn接口向所述目标基站发送所述终端的切换请求后，接收目标基站通过Xn接口发送的TA补偿相关信息；
若所述网络设备间的接口为NG接口，通过NG接口向核心网发送所述终端的切换请求，以使所述目标基站接收到核心网转发的所述切换请求后向所述核心网发送TA补偿相关信息；
接收核心网通过NG接口发送的TA补偿相关信息。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，所述TA补偿相关信息包括以下任一项或其组合：
所述目标小区馈电链路feeder link的传输时延；
所述目标小区的TA补偿值；
星历信息；
所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，将所述TA补偿相关信息发送至所述终端，具体为：
向终端发送RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
具体来说，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
图13是本公开又一实施例提供的基站的结构示意图，如图13所示，该基站包括：第一发送模块1310；其中：
第一发送模块1310用于目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
具体地，目标小区归属的目标基站通过第一发送模块1310通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，以使源基站收到TA补偿相关信息后将其传输给终端用于上行传输。
本公开实施例提供的基站，通过在终端进行小区切换时，向终端发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
在此需要说明的是，本公开实施例提供的上述基站，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
图14是本公开另一实施例提供的终端的结构示意图，如图14所示，该终端包括：接收模块1410及上行传输模块1420；其中：
接收模块1410用于接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
上行传输模块1420用于基于所述TA补偿相关信息进行上行传输。
具体地，终端通过接收模块1410接收源小区发送的TA补偿相关信息后，通过上行传输模块1420基于TA补偿相关信息进行上行传输。其中，TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源 小区归属的源基站的。
本公开实施例提供的终端，通过在进行小区切换时，接收目标基站提供的终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
在此需要说明的是，本公开实施例提供的上述终端，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
图15是本公开再一实施例提供的基站的结构示意图，如图15所示，该基站包括：获取模块1510及第二发送模块1520；其中：
获取模块1510用于获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；第二发送模块1520用于将所述TA补偿相关信息发送至所述终端。
具体地，源小区归属的源基站通过获取模块1510获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；然后通过第二发送模块1520将TA补偿相关信息发送至所述终端，以使终端基于TA补偿相关信息完成上行传输。
本公开实施例提供的基站，通过在终端进行小区切换时，接收目标基站提供的终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，并发送给终端，以使终端可以清晰准确地确定其切换到的目标小区使用的TA预补偿值，合理地进行定时提前补偿，从而提高终端小区切换成功率，降低切换时延。
在此需要说明的是，本公开实施例提供的上述装置，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
需要说明的是，本公开实施例中对单元的划分是示意性的，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。另外，在本公开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。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个处理器可读取存储介质中。基于这样的理解，本公开的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本公开各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
在此需要说明的是，本公开实施例提供的上述装置，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于上述任一实施例，本公开实施例还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述各实施例提供的方法，例如包括：
目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
基于上述任一实施例，本公开实施例还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述各实施例提供的方法，例如包括：
接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
基于所述TA补偿相关信息进行上行传输。
基于上述任一实施例，本公开实施例还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述各实施例提供的方法，例如包括：
获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
将所述TA补偿相关信息发送至所述终端。
本实施例提供的处理器可读存储介质，其上存储的计算机程序使处理器能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
所述处理器可读存储介质可以是处理器能够存取的任何可用介质或数据存储设备，包括但不限于磁性存储器(例如软盘、硬盘、磁带、磁光盘(MO)等)、光学存储器(例如CD、DVD、BD、HVD等)、以及半导体存储器(例如ROM、EPROM、EEPROM、非易失性存储器(NAND FLASH)、固态硬盘(SSD))等。
本领域内的技术人员应明白，本公开的实施例可提供为方法、系统、或计算机程序产品。因此，本公开可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本公开是参照根据本公开实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机可执行指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机可执行指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些处理器可执行指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的处理器可读存储器中，使得存储在该处理器可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程 或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些处理器可执行指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (50)

  1. 一种定时提前补偿方法，其特征在于，包括：
    目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
  2. 根据权利要求1所述的定时提前补偿方法，其特征在于，所述源小区或目标小区为以下任一类型的小区：
    地面小区；
    卫星小区。
  3. 根据权利要求1所述的定时提前补偿方法，其特征在于，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
  4. 根据权利要求1所述的定时提前补偿方法，其特征在于，所述网络设备间的接口为：
    源基站和目标基站之间的直接接口Xn接口；或
    目标基站与核心网设备之间的NG接口；或
    所述核心网设备与所述源基站之间的NG接口。
  5. 根据权利要求4所述的定时提前补偿方法，其特征在于，所述目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，包括：
    若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
    若所述网络设备间的接口为NG接口，接收核心网发送的所述终端的切换请求，所述切换请求是源基站通过NG接口向核心网发送的；
    向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
  6. 根据权利要求1至5任一项所述的定时提前补偿方法，其特征在于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
  7. 根据权利要求6所述的定时提前补偿方法，其特征在于，若所述目标小区为地面小区，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区的TA补偿值；
    所述目标小区的小区类型指示信息。
  8. 根据权利要求1所述的定时提前补偿方法，其特征在于，若所述目标小区为卫星小区且所述卫星为透传模式卫星，则所述方法还包括，目标基站补偿馈电链路feeder link的传输时延。
  9. 一种定时提前补偿方法，其特征在于，包括：
    接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
    基于所述TA补偿相关信息进行上行传输。
  10. 根据权利要求9所述的定时提前补偿方法，其特征在于，所述源小区或目标小区为以下任一类型的小区：
    地面小区；
    卫星小区。
  11. 根据权利要求9所述的定时提前补偿方法，其特征在于，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
  12. 根据权利要求9所述的定时提前补偿方法，其特征在于，所述网络设备间的接口为：
    源基站和目标基站之间的直接接口Xn接口；或
    目标基站与核心网设备之间的NG接口；或
    所述核心网设备与所述源基站之间的NG接口。
  13. 根据权利要求9至12任一项所述的定时提前补偿方法，其特征在于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
  14. 根据权利要求13所述的定时提前补偿方法，其特征在于，基于所述TA补偿相关信息进行上行传输，包括：
    若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在所述目标小区进行上行传输时使用的TA值为0；
    基于所述TA值在目标小区进行上行传输。
  15. 根据权利要求9至12任一项所述的定时提前补偿方法，其特征在于，所述接收所述源小区归属的源基站发送的TA补偿相关信息，具体为：
    接收所述源基站发送的RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
  16. 一种定时提前补偿方法，其特征在于，包括：
    获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
    将所述TA补偿相关信息发送至所述终端。
  17. 根据权利要求16所述的定时提前补偿方法，其特征在于，源小区或目标小区为以下任一类型的小区：
    地面小区；
    卫星小区。
  18. 根据权利要求16所述的定时提前补偿方法，其特征在于，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
  19. 根据权利要求16所述的定时提前补偿方法，其特征在于，所述网络设备间的接口为：
    源基站和目标基站之间的直接接口Xn接口；或
    目标基站与核心网设备之间的NG接口；或
    所述核心网设备与所述源基站之间的接口NG接口。
  20. 根据权利要求19所述的定时提前补偿方法，其特征在于，所述获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息，包括：
    若所述网络设备间的接口为Xn接口，通过Xn接口向所述目标基站发送所述终端的切换请求后，接收目标基站通过Xn接口发送的TA补偿相关信息；
    若所述网络设备间的接口为NG接口，通过NG接口向核心网发送所述终端的切换请求，以使所述目标基站接收到核心网转发的所述切换请求后向所述核心网发送TA补偿相关信息；
    接收核心网通过NG接口发送的TA补偿相关信息。
  21. 根据权利要求16至20任一项所述的定时提前补偿方法，其特征在 于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
  22. 根据权利要求16至20任一项所述的定时提前补偿方法，其特征在于，将所述TA补偿相关信息发送至所述终端，具体为：
    向终端发送RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
  23. 一种基站，其特征在于，包括存储器、收发机和处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
  24. 根据权利要求23所述的基站，其特征在于，所述源小区或目标小区为以下任一类型的小区：
    地面小区；
    卫星小区。
  25. 根据权利要求23所述的基站，其特征在于，所述在目标小区进行上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
  26. 根据权利要求23所述的基站，其特征在于，所述网络设备间的接口为：
    源基站和目标基站之间的直接接口Xn接口；或
    目标基站与核心网设备之间的NG接口；或
    所述核心网设备与所述源基站之间的NG接口。
  27. 根据权利要求26所述的基站，其特征在于，所述目标小区归属的目标基站通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息，包括：
    若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
    若所述网络设备间的接口为NG接口，接收核心网发送的所述终端的切换请求，所述切换请求是源基站通过NG接口向核心网发送的；
    向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
  28. 根据权利要求23至27任一项所述的基站，其特征在于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
  29. 根据权利要求28所述的基站，其特征在于，若所述目标小区为地面小区，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区的TA补偿值；
    所述目标小区的小区类型指示信息。
  30. 根据权利要求23所述的基站，其特征在于，若所述目标小区为卫星小区且所述卫星为透传模式卫星，则所述操作还包括，目标基站补偿馈电链路feeder link的传输时延。
  31. 一种终端，其特征在于，包括存储器、收发机和处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区 归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
    基于所述TA补偿相关信息进行上行传输。
  32. 根据权利要求31所述的终端，其特征在于，所述源小区或目标小区为以下任一类型的小区：
    地面小区；
    卫星小区。
  33. 根据权利要求31所述的终端，其特征在于，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
  34. 根据权利要求31所述的终端，其特征在于，所述网络设备间的接口为：
    源基站和目标基站之间的直接接口Xn接口；或
    目标基站与核心网设备之间的NG接口；或
    所述核心网设备与所述源基站之间的NG接口。
  35. 根据权利要求31至34任一项所述的终端，其特征在于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
  36. 根据权利要求35所述的终端，其特征在于，基于所述TA补偿相关信息进行上行传输，包括：
    若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小 区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在所述目标小区进行上行传输时使用的TA值为0；
    基于所述TA值在目标小区进行上行传输。
  37. 根据权利要求31至34任一项所述的终端，其特征在于，所述接收源小区发送的TA补偿相关信息，具体为：
    接收所述源基站发送的RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
  38. 一种基站，其特征在于，包括存储器、收发机和处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
    将所述TA补偿相关信息发送至所述终端。
  39. 一种基站，其特征在于，所述基站是目标小区归属的目标基站，所述基站包括：
    第一发送模块，用于通过网络设备间的接口向源小区归属的源基站发送终端在目标小区进行上行传输时使用的定时提前TA补偿相关信息。
  40. 根据权利要求39所述的基站，其特征在于，所述第一发送模块还用于：
    若所述网络设备间的接口为Xn接口，通过Xn接口接收源基站发送的终端的切换请求后，通过Xn接口向所述源基站发送TA补偿相关信息；
    若所述网络设备间的接口为NG接口，接收核心网发送的所述终端的切换请求，所述切换请求是源基站通过NG接口向核心网发送的；
    向所述核心网发送TA补偿相关信息，以使所述核心网通过NG接口向源基站发送所述TA补偿相关信息。
  41. 根据权利要求39至40任一项所述的基站，其特征在于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型是地面小区或卫星小区。
  42. 一种终端，其特征在于，包括：
    接收模块，用于接收源小区发送的TA补偿相关信息，所述TA补偿相关信息是目标小区归属的目标基站通过网络设备间的接口发送给所述源小区归属的源基站的；
    上行传输模块，用于基于所述TA补偿相关信息进行上行传输。
  43. 根据权利要求42所述的终端，其特征在于，所述源小区或目标小区为以下任一类型的小区：
    地面小区；
    卫星小区。
  44. 根据权利要求42所述的终端，其特征在于，所述上行传输是指终端在目标小区发起的随机接入过程的第一条消息或终端在目标小区的第一条PUSCH传输。
  45. 根据权利要求42所述的终端，其特征在于，所述网络设备间的接口为：
    源基站和目标基站之间的直接接口Xn接口；或
    目标基站与核心网设备之间的NG接口；或
    所述核心网设备与所述源基站之间的NG接口。
  46. 根据权利要求42至45任一项所述的终端，其特征在于，所述TA补偿相关信息包括以下任一项或其组合：
    所述目标小区馈电链路feeder link的传输时延；
    所述目标小区的TA补偿值；
    星历信息；
    所述目标小区的参考点位置信息和所述目标小区参考点对应的TA信息；
    所述目标小区的小区类型指示信息；其中所述小区类型可以是地面小区或卫星小区。
  47. 根据权利要求46所述的终端，其特征在于，所述上行传输模块还用于：
    若所述TA补偿相关信息为所述目标小区馈电链路feeder link的传输时延，则基于终端位置信息、星历信息和所述目标小区馈电链路feeder link的传输时延，确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区的TA补偿值，则将所述目标小区的TA补偿值确定为在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述星历信息，则基于终端位置信息和所述星历信息，确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区参考点位置信息和所述目标小区参考点对应的TA信息，则基于终端位置信息和所述目标小区参考点位置信息计算所述目标小区的TA信息和终端自身TA的差值，并根据所述差值和所述目标小区参考点对应的TA信息确定在所述目标小区进行上行传输时使用的TA值；
    若所述TA补偿相关信息为所述目标小区的小区类型指示信息，则基于所述目标小区的小区类型指示信息确定所述目标小区为地面小区，并确定在所述目标小区进行上行传输时使用的TA值为0；
    基于所述TA值在目标小区进行上行传输。
  48. 根据权利要求42至45任一项所述的终端，其特征在于，所述接收模块还用于：
    接收所述源基站发送的RRC重配消息，所述RRC重配消息中包括所述TA补偿相关信息。
  49. 一种基站，所述基站是源小区归属的源基站，其特征在于，包括：
    获取模块，用于获取目标小区归属的目标基站通过网络设备间的接口发送的终端在目标小区进行上行传输时使用的TA补偿相关信息；
    第二发送模块，用于将所述TA补偿相关信息发送至所述终端。
  50. 一种非暂态计算机可读存储介质，其上存储有计算机程序，其特征在于，该计算机程序被处理器执行时实现如权利要求1至8任一项所述的定时提前补偿方法的步骤，或实现如权利要求9至15任一项所述的定时提前补偿方法的步骤，或实现如权利要求16至22任一项所述的定时提前补偿方法的步骤。
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