Communication method, destination base station, source base station, terminal, apparatus, and storage medium

Abstract

The present disclosure relates to a communication method, a destination base station, a source base station, a terminal, an apparatus, and a storage medium. The method comprises: receiving a first message sent by a source base station of a terminal, the first message being used for requesting to hand over the terminal from a source cell of the source base station to a destination cell of a destination base station; and determining a first indication on the basis of the first message, the first indication being used for indicating the moment when the terminal is handed over. According to the present disclosure, in the process of a terminal moving from a source base station to a destination base station, a network sends to the terminal an RRC message comprising handover information, and the network indicates, in the RRC message comprising the handover information, the moment when the terminal is handed over, so that the technical problem in the prior art that a network is difficult to select a proper time for sending an RRC message comprising handover information is solved.

Description

Communication method, destination base station, source base station, terminal, device and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a communication method, a destination base station, a source base station, a terminal, an apparatus, and a storage medium. Background Art

[0002] In related art, when a terminal moves from a source base station to a destination base station, the network sends a Radio Resource Control (RRC) message containing handover information to the terminal. The terminal performs handover immediately after receiving the handover information.

[0003] If the network sends the RRC message containing the handover information to the terminal too early or too late, the handover of the terminal may fail. Therefore, it is difficult for the network to select an appropriate time to send the RRC message containing the handover information.

[0004] Summary of the Invention

[0005] The embodiments of the present disclosure provide a communication method, a destination base station, a source base station, a terminal, an apparatus, and a storage medium.

[0006] In a first aspect, an embodiment of the present disclosure provides a communication method, which is performed by a destination base station of a terminal, and the method includes:

[0007] Receiving a first message sent by a source base station of a terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station;

[0008] A first indication is determined according to the first message, where the first indication is used to indicate a time when the terminal performs switching.

[0009] In a second aspect, an embodiment of the present disclosure provides a communication method, which is performed by a source base station of a terminal, and the method includes:

[0010] receiving a second message sent by a destination base station, where the second message is used to instruct the destination base station to accept handover of a wireless network connection of a terminal from a source cell of the source base station to a destination cell of the destination base station;

[0011] The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station;

[0012] The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0013] In a third aspect, an embodiment of the present disclosure provides a communication method, which is executed by a terminal, and the method includes:

[0014] receiving a third message and a first indication sent by the second device; or,

[0015] receiving the third message sent by the second device, where the third message includes the first indication;

[0016] The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

[0017] In a fourth aspect, an embodiment of the present disclosure provides a destination base station for a terminal, including:

[0018] a receiving module, configured to receive a first message sent by a source base station of a terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station;

[0019] The processing module is used to determine a first indication according to the first message, where the first indication is used to indicate a time when the terminal performs switching.

[0020] In a fifth aspect, an embodiment of the present disclosure provides a source base station of a terminal, including:

[0021] a receiving module, configured to receive a second message sent by a destination base station, wherein the second message is used to instruct the destination base station to accept handover of the wireless network connection of the terminal from the source cell of the source base station to the destination cell of the destination base station;

[0022] The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station;

[0023] The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0024] In a sixth aspect, an embodiment of the present disclosure provides a terminal, including:

[0025] a receiving module, configured to receive a third message and a first indication sent by a second device; or

[0026] receiving the third message sent by the second device, where the third message includes the first indication;

[0027] The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

[0028] In a seventh aspect, an embodiment of the present disclosure provides a destination base station for a terminal, including:

[0029] one or more processors;

[0030] The destination base station of the terminal is used to execute the communication method described in any one of the first aspects of the embodiments of this disclosure.

[0031] In an eighth aspect, an embodiment of the present disclosure provides a source base station of a terminal, including:

[0032] one or more processors;

[0033] The source base station of the terminal is used to execute the communication method described in any one of the second aspects of the embodiments of this disclosure.

[0034] In a ninth aspect, an embodiment of the present disclosure provides a terminal, including:

[0035] one or more processors;

[0036] The terminal is used to execute the communication method described in any one of the third aspects of the embodiments of this disclosure.

[0037] In the tenth aspect, an embodiment of the present disclosure proposes a communication system, comprising a destination base station of a terminal, a source base station of the terminal, and a terminal; wherein the destination base station of the terminal is configured to implement the communication method of any one of the first aspect of the embodiment of the present disclosure; the source base station of the terminal is configured to implement the communication method of any one of the second aspect of the embodiment of the present disclosure; and the terminal is configured to implement the communication method of any one of the third aspect of the embodiment of the present disclosure.

[0038] In an eleventh aspect, an embodiment of the present disclosure proposes a storage medium, which, when an instruction is executed on a communication device, enables the communication device to execute any one of the communication methods of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0040] FIG1A is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure;

[0041] FIG1B is an exemplary schematic diagram showing handover of a terminal from a source cell of a source base station to a target cell of a target base station according to an embodiment of the present disclosure;

[0042] FIG2 is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure;

[0043] FIG3 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0044] FIG4 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0045] FIG5 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0046] FIG6 is an interactive schematic diagram illustrating a communication method according to an embodiment of the present disclosure;

[0047] FIG7A is a schematic structural diagram of a destination base station of a terminal proposed in an embodiment of the present disclosure;

[0048] FIG7B is a schematic structural diagram of a source base station of a terminal proposed in an embodiment of the present disclosure;

[0049] FIG7C is a schematic structural diagram of a terminal proposed in an embodiment of the present disclosure;

[0050] FIG8A is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure;

[0051] FIG8B is a schematic diagram of the structure of the chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] The embodiments of the present disclosure provide a communication method, a destination base station, a source base station, a terminal, an apparatus, and a storage medium.

[0053] In a first aspect, an embodiment of the present disclosure provides a communication method, which is executed by a destination base station of a terminal, and the method includes:

[0054] Receiving a first message sent by a source base station of a terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station;

[0055] A first indication is determined according to the first message, where the first indication is used to indicate a time when the terminal performs switching.

[0056] In the above embodiment, the destination base station determines the first indication based on the first message, and the first indication is used to indicate the time when the terminal performs switching; in this way, the terminal can switch from the source cell of the source base station to the destination cell of the destination base station according to the time of performing switching indicated by the first indication.

[0057] With reference to some embodiments of the first aspect, in some embodiments, the first message includes first information, and the destination base station determines the first indication according to the first information;

[0058] The first information includes the time when the source base station instructs the terminal to perform handover.

[0059] In the above embodiment, the source base station adds first information to the first message, where the first information is the time when the source base station instructs the terminal to perform handover; thus, the destination base station can determine the first information as the first instruction.

[0060] In conjunction with some embodiments of the first aspect, in some embodiments, the moment when the terminal performs handover is represented by any one of the following methods:

[0061] The duration for which the terminal delays performing the handover;

[0062] Timing relationships of the wireless air interface;

[0063] The clock time at which the terminal performed the handover.

[0064] In the above embodiment, the first indication indicates the time when the terminal executes the switch through one of the duration of the terminal delayed switching, the timing relationship of the wireless air interface and the time when the terminal executes the switch; in this way, the terminal switches according to the time when the terminal executes the switch indicated by the first indication.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, the wireless air interface is a wireless air interface of a cell of the source base station or the destination base station;

[0066] The timing relationship is one of an uplink timing relationship and a downlink timing relationship.

[0067] In the above embodiment, the wireless air interface is the wireless air interface of the cell of the source base station or the destination base station, and the timing relationship is one of the uplink timing relationship and the downlink timing relationship; in this way, the timing relationship of the wireless air interface corresponding to the moment when the terminal performs the switching can be determined.

[0068] In conjunction with some embodiments of the first aspect, in some embodiments, the cell of the source base station or the target base station is any one of the following:

[0069] The primary cell PCell of the source base station;

[0070] The primary and secondary cells (PSCells) of the source base station;

[0071] The primary cell PCell of the target base station;

[0072] The target base station is a primary or secondary cell (PSCell).

[0073] In the above embodiment, based on the primary cell of the source base station, the primary and secondary cells of the source base station, the primary cell of the target base station and one of the primary and secondary cells of the target base station, it can be determined which cell's wireless air interface moment the terminal performs handover.

[0074] In conjunction with some embodiments of the first aspect, in some embodiments, the timing relationship of the wireless air interface includes:

[0075] Any one of the system frame number, subframe number, time slot number and orthogonal frequency division multiplexing (OFDM) symbol number.

[0076] In the above embodiment, the moment when the terminal performs the switch is determined by any one of the system frame number, subframe number, time slot number and orthogonal frequency division multiplexing OFDM symbol number; in this way, the moment when the terminal performs the switch can be determined by different time granularities in the timing relationship of the wireless air interface.

[0077] In combination with some embodiments of the first aspect, in some embodiments, the moment when the terminal performs switching is represented by the system frame number at which the terminal performs switching.

[0078] In the above embodiment, the time when the terminal performs handover is represented by the system frame number at which the terminal performs handover; thus, the terminal performs handover at the beginning of the system frame with the corresponding number.

[0079] In combination with some embodiments of the first aspect, in some embodiments, the moment when the terminal performs switching is represented by the system frame number of the system frame where the subframe in which the terminal performs switching is located and the subframe number of the subframe.

[0080] In the above embodiment, the time when the terminal performs switching is represented by the system frame number of the system frame where the subframe where the terminal performs switching is located and the subframe number of the subframe; thus, the terminal performs switching at the beginning of the subframe with the corresponding number.

[0081] In conjunction with some embodiments of the first aspect, in some embodiments, the moment when the terminal performs handover is represented by any one of the following methods:

[0082] The system frame number of the system frame in which the time slot in which the terminal performs handover is located and the time slot number of the time slot;

[0083] The system frame number of the system frame where the time slot where the terminal performs switching is located, the subframe number of the subframe where the time slot is located, and the time slot number of the time slot.

[0084] In the above embodiment, the moment when the terminal performs switching is indicated by the system frame number of the system frame in which the time slot at which the terminal performs switching is located and the time slot number of the time slot; or, it is indicated by the system frame number of the system frame in which the time slot at which the terminal performs switching is located, the subframe number of the subframe in which the time slot is located and the time slot number of the time slot; in this way, the terminal performs switching at the beginning of the time slot with the corresponding number.

[0085] In conjunction with some embodiments of the first aspect, in some embodiments, the moment when the terminal performs handover is represented by any one of the following methods:

[0086] The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol;

[0087] The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol;

[0088] The terminal performs switching on a system frame number of a system frame where the OFDM symbol is located, a subframe number of a subframe where the OFDM symbol is located, a time slot number of a time slot where the OFDM symbol is located, and an OFDM symbol number of the OFDM symbol.

[0089] In the above embodiment, the moment when the terminal performs switching is indicated by the system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; or, it is indicated by the system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; or, it is indicated by the system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; in this way, the terminal performs switching at the beginning of the OFDM symbol with the corresponding number.

[0090] In combination with some embodiments of the first aspect, in some embodiments, the moment when the terminal performs switching is indicated by a GPS standard clock or a UTC standard clock.

[0091] In the above embodiment, the time when the terminal performs handover is indicated by the GPS standard clock or the UTC standard clock; thus, the time when the terminal performs handover has nothing to do with the timing relationship of the wireless air interface.

[0092] In conjunction with some embodiments of the first aspect, in some embodiments, determining the first indication further includes:

[0093] Sending a second message to the source base station, where the second message is used to instruct the destination base station to accept handover of the terminal from the source cell of the source base station to the destination cell of the destination base station;

[0094] The second message includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station;

[0095] The second message or the third message includes the first indication.

[0096] In the above embodiment, the destination base station sends a second message to the source base station, the second message includes a third message, and the second message or the third message includes a first indication; if the second message includes the first indication, the source base station can obtain the first indication by parsing the second message, thereby knowing the moment when the terminal performs the switch.

[0097] In a second aspect, an embodiment of the present disclosure provides a communication method, which is performed by a source base station of a terminal, and the method includes:

[0098] receiving a second message sent by a destination base station, where the second message is used to instruct the destination base station to accept handover of a wireless network connection of a terminal from a source cell of the source base station to a destination cell of the destination base station;

[0099] The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station;

[0100] The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0101] In the above embodiment, the source base station receives a second message, the second message includes a third message, and the second message or the third message includes a first indication; if the second message includes the first indication, the source base station can obtain the first indication by parsing the second message, thereby knowing the moment when the terminal performs the switch.

[0102] In conjunction with some embodiments of the second aspect, in some embodiments, the receiving the second message sent by the destination base station also includes:

[0103] Determining to switch the wireless network connection of the terminal from the source cell to the destination cell;

[0104] A first message is sent to the target base station, where the first message is used to request handover of the wireless network connection of the terminal from the source cell to the target cell.

[0105] In the above embodiment, the source base station determines to switch the access cell of the terminal from the source cell of the source base station to the destination cell of the destination base station, and sends a first message to the destination base station, where the first message is used to request that the wireless network connection of the terminal be switched from the source cell to the destination cell; in this way, the destination base station responds to the first message sent by the source base station and sends a second message to the source base station, where the second message is used to instruct the destination base station to accept the switching of the wireless network connection of the terminal from the source cell of the source base station to the destination cell of the destination base station.

[0106] In conjunction with some embodiments of the second aspect, in some embodiments, the receiving the second message sent by the destination base station further includes:

[0107] sending the second message to the terminal;

[0108] The second message includes the third message, and the second message or the third message includes the first indication.

[0109] In the above embodiment, the source base station sends the second message to the terminal, wherein the second message includes the third message, and the second message or the third message includes the first indication; in this way, the terminal can switch the access cell from the source cell of the source base station to the destination cell of the destination base station according to the switching time indicated by the first indication.

[0110] In conjunction with some embodiments of the second aspect, in some embodiments, the sending the second message and the third message to the terminal further includes:

[0111] A fourth message sent by the terminal is received, where the fourth message is used to indicate that the terminal has received the first indication.

[0112] In the above embodiment, the fourth message sent by the terminal is received, and the fourth message is used to indicate that the terminal has received the first indication; in this way, the source base station knows that the terminal has successfully received the first indication.

[0113] In a third aspect, an embodiment of the present disclosure provides a communication method, which is executed by a terminal, and the method includes:

[0114] receiving a third message and a first indication sent by the second device; or,

[0115] receiving the third message sent by the second device, where the third message includes the first indication;

[0116] The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

[0117] In the above embodiment, the terminal receives a first indication sent by a source base station, where the first indication is used to indicate a time for the terminal to perform handover; thus, the terminal can perform handover according to the handover time indicated by the first indication.

[0118] In conjunction with some embodiments of the third aspect, in some embodiments, the moment when the terminal performs switching is represented by any one of the following methods:

[0119] The duration for which the terminal delays performing the handover;

[0120] Timing relationships of the wireless air interface;

[0121] The clock time at which the terminal performed the handover.

[0122] In the above embodiment, the first indication indicates the time when the terminal executes the switch through one of the duration of the terminal delayed switching, the timing relationship of the wireless air interface and the time when the terminal executes the switch; in this way, the terminal switches through the time when the terminal executes the switch indicated by the first indication.

[0123] In conjunction with some embodiments of the third aspect, in some embodiments, the wireless air interface is a wireless air interface of a cell of the source base station or the destination base station;

[0124] The timing relationship is one of an uplink timing relationship and a downlink timing relationship.

[0125] In the above embodiment, the wireless air interface is the wireless air interface of the cell of the source base station or the destination base station, and the timing relationship is one of the uplink timing relationship and the downlink timing relationship; in this way, the timing relationship of the wireless air interface corresponding to the moment when the terminal performs the switching can be determined.

[0126] In conjunction with some embodiments of the third aspect, in some embodiments, the cell of the source base station or the target base station is any one of the following:

[0127] The primary cell PCell of the source base station;

[0128] The source base station primary and secondary cell PSCell;

[0129] The primary cell PCell of the target base station;

[0130] The target base station is a primary or secondary cell (PSCell).

[0131] In the above embodiment, based on the primary cell of the source base station, the primary and secondary cells of the source base station, the primary cell of the target base station and one of the primary and secondary cells of the target base station, it can be determined which cell's wireless air interface moment the terminal performs handover.

[0132] In conjunction with some embodiments of the third aspect, in some embodiments, the timing relationship of the wireless air interface includes:

[0133] Any one of the system frame number, subframe number, time slot number and orthogonal frequency division multiplexing (OFDM) symbol number.

[0134] In the above embodiment, the moment when the terminal performs the switch is determined by any one of the system frame number, subframe number, time slot number and orthogonal frequency division multiplexing OFDM symbol number; in this way, the moment when the terminal performs the switch can be determined by different time granularities in the timing relationship of the wireless air interface.

[0135] In combination with some embodiments of the third aspect, in some embodiments, the moment when the terminal performs switching is represented by the system frame number at which the terminal performs switching.

[0136] In the above embodiment, the time when the terminal performs handover is represented by the system frame number at which the terminal performs handover; thus, the terminal performs handover at the beginning of the system frame with the corresponding number.

[0137] In combination with some embodiments of the third aspect, in some embodiments, the moment when the terminal performs switching is represented by the system frame number of the system frame where the subframe in which the terminal performs switching is located and the subframe number of the subframe.

[0138] In the above embodiment, the time when the terminal performs switching is represented by the system frame number of the system frame where the subframe where the terminal performs switching is located and the subframe number of the subframe; thus, the terminal performs switching at the beginning of the subframe with the corresponding number.

[0139] In conjunction with some embodiments of the third aspect, in some embodiments, the moment when the terminal performs handover is represented by any one of the following methods:

[0140] The system frame number of the system frame in which the time slot in which the terminal performs handover is located and the time slot number of the time slot;

[0141] The system frame number of the system frame where the time slot where the terminal performs switching is located, the subframe number of the subframe where the time slot is located, and the time slot number of the time slot.

[0142] In the above embodiment, the moment when the terminal performs switching is represented by the system frame number of the time slot where the terminal performs switching and the time slot number of the time slot; or, it is represented by the system frame number of the system frame where the time slot where the terminal performs switching is located, the subframe number of the subframe where the time slot is located and the time slot number of the time slot; in this way, the terminal performs switching at the beginning of the time slot with the corresponding number.

[0143] In conjunction with some embodiments of the third aspect, in some embodiments, the moment when the terminal performs handover is represented by any one of the following methods:

[0144] The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol;

[0145] The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol;

[0146] The terminal performs switching on a system frame number of a system frame where the OFDM symbol is located, a subframe number of a subframe where the OFDM symbol is located, a time slot number of a time slot where the OFDM symbol is located, and an OFDM symbol number of the OFDM symbol.

[0147] In the above embodiment, the moment when the terminal performs switching is indicated by the system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; or, it is indicated by the system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; or, it is indicated by the system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; in this way, the terminal can perform switching at the beginning of the OFDM symbol with the corresponding number.

[0148] In combination with some embodiments of the third aspect, in some embodiments, the moment when the terminal performs switching is indicated by a GPS standard clock or a UTC standard clock.

[0149] In the above embodiment, the time when the terminal performs handover is indicated by the GPS standard clock or the UTC standard clock; thus, the time when the terminal performs handover has nothing to do with the timing relationship of the wireless air interface.

[0150] In conjunction with some embodiments of the third aspect, in some embodiments, the receiving the first indication sent by the source base station further includes:

[0151] A fourth message is sent to the source base station, where the fourth message is used to indicate that the terminal has received the first indication.

[0152] In the above embodiment, a fourth message is sent to the source base station, where the fourth message is used to indicate that the terminal has received the first indication. In this way, the source base station can determine that the terminal has received the first indication.

[0153] In combination with some embodiments of the third aspect, in some embodiments, the terminal is switched from the source cell of the source base station to the destination cell of the destination base station at the time indicated by the first indication.

[0154] In the above embodiment, the terminal switches from the source cell of the source base station to the destination cell of the destination base station according to the switching time indicated by the first indication.

[0155] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0156] A fifth message is sent to the destination base station, where the fifth message is used to indicate that the terminal has been handed over from the source cell of the source base station to the destination cell of the destination base station.

[0157] In the above embodiment, after the terminal performs the handover, it sends a fifth message to the destination base station, where the fifth message is used to indicate that the terminal has been handed over from the source cell of the source base station to the destination cell of the destination base station; in this way, the destination base station can know that the terminal has completed the handover.

[0158] In a fourth aspect, an embodiment of the present disclosure provides a destination base station for a terminal, including:

[0159] a receiving module, configured to receive a first message sent by a source base station of a terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station;

[0160] The processing module is used to determine a first indication according to the first message, where the first indication is used to indicate a time when the terminal performs switching.

[0161] In a fifth aspect, an embodiment of the present disclosure provides a source base station of a terminal, including:

[0162] a receiving module, configured to receive a second message sent by a destination base station, wherein the second message is used to instruct the destination base station to accept handover of the wireless network connection of the terminal from the source cell of the source base station to the destination cell of the destination base station;

[0163] The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station;

[0164] The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0165] In a sixth aspect, an embodiment of the present disclosure provides a terminal, including:

[0166] a receiving module, configured to receive a third message and a first indication sent by a second device; or

[0167] receiving the third message sent by the second device, where the third message includes the first indication;

[0168] The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

[0169] In a seventh aspect, an embodiment of the present disclosure provides a destination base station for a terminal, including:

[0170] one or more processors;

[0171] The destination base station of the terminal is used to execute the communication method described in any one of the first aspects of the embodiments of this disclosure.

[0172] In an eighth aspect, an embodiment of the present disclosure provides a source base station of a terminal, including:

[0173] one or more processors;

[0174] The source base station of the terminal is used to execute the communication method described in any one of the second aspects of the embodiments of this disclosure.

[0175] In a ninth aspect, an embodiment of the present disclosure provides a terminal, including:

[0176] one or more processors;

[0177] The terminal is used to execute the communication method described in any one of the third aspects of the embodiments of this disclosure.

[0178] In the tenth aspect, an embodiment of the present disclosure proposes a communication system, comprising a destination base station of a terminal, a source base station of the terminal, and a terminal; wherein the destination base station of the terminal is configured to implement the communication method of any one of the first aspect of the embodiment of the present disclosure; the source base station of the terminal is configured to implement the communication method of any one of the second aspect of the embodiment of the present disclosure; and the terminal is configured to implement the communication method of any one of the third aspect of the embodiment of the present disclosure.

[0179] In an eleventh aspect, an embodiment of the present disclosure proposes a storage medium, which, when an instruction is executed on a communication device, enables the communication device to execute any one of the communication methods of the embodiments of the present disclosure.

[0180] In the twelfth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation of the first aspect, the second aspect, and the third aspect.

[0181] In a thirteenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first, second, and third aspects.

[0182] In a fourteenth aspect, an embodiment of the present disclosure provides a chip or a chip system, which includes a processing circuit configured to execute the method described in the optional implementation of the first, second, and third aspects above.

[0183] It is understandable that the destination base station of the terminal, the source base station of the terminal, the terminal, the communication system, the storage medium, the program product, the computer program, the chip, or the chip system are all used to perform the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding method and will not be repeated here.

[0184] The embodiments of the present disclosure provide a communication method, a destination base station, a source base station, a terminal, an apparatus, and a storage medium. In some embodiments, the terms communication method, signal transmission method, wireless frame transmission method, etc. are interchangeable, and the terms information processing system, communication system, etc. are interchangeable.

[0185] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0186] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0187] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0188] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0189] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0190] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0191] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0192] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0193] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0194] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0195] In some embodiments, terms such as "greater than", "less than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0196] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "device", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0197] In some embodiments, “access network device (AN device)”, “radio access network device (radio

[0198] The terms access network device (RAN device),” “base station (BS)”, “radio base station”, “fixed station”, “node”, “access point”, “transmission point (TP)”, “reception point (RP)”, “transmission / reception point (TRP)”, “panel”, “antenna panel”, “antenna array”, “cell”, “macro cell”, “small cell”, “femto cell”, “pico cell”, “sector”, “cell group”, “carrier”, “component carrier”, and “bandwidth part (BWP)” are used interchangeably.

[0199] In some embodiments, the device may refer to a device on the ground, such as an access network device and / or a core network device on the ground; it may also refer to a device on a satellite, such as an access network device and / or a core network device on a satellite; the embodiments of the present disclosure do not limit whether the device is a device on the ground or a device on a satellite, nor do they limit whether the device refers to an access network device or a core network device.

[0200] In some embodiments, the terms "terminal", "terminal device", "user equipment (terminal)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0201] In some embodiments, the device may refer to a device on the ground, such as an access network device and / or a core network device on the ground; it may also refer to a device on a satellite, such as an access network device and / or a core network device on a satellite; the embodiments of the present disclosure do not limit whether the device is a device on the ground or a device on a satellite, nor do they limit whether the device refers to an access network device or a core network device.

[0202] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, it can also be called device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the terminal has all or part of the functions of the access network device. In addition, language such as "uplink" and "downlink" can also be replaced by language corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0203] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0204] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable with each other, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable with each other, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable with each other.

[0205] In some embodiments, the terms "downlink control information (DCI)", "downlink (DL) assignment", "DL DCI", "uplink (UL) grant", "UL DCI" and the like may be used interchangeably.

[0206] In some embodiments, terms such as "physical downlink shared channel (PDSCH)" and "DL data" can be used interchangeably, and terms such as "physical uplink shared channel (PUSCH)" and "UL data" can be used interchangeably.

[0207] In some embodiments, "obtain", "get", "obtain", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from a protocol, obtaining by self-processing, autonomous implementation, etc.

[0208] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0209] In some embodiments, "predetermined" and "preset" can be interpreted as pre-specified in a protocol, etc., or can be interpreted as a pre-set action performed by a device, etc.

[0210] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0211] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0212] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0213] FIG1A is an exemplary schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1A , a communication system 100 includes a destination base station 101 of a terminal, a source base station 102 of the terminal, and a terminal 103 .

[0214] In some embodiments, the terminal includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication capabilities, a smart car, a tablet computer, a computer with wireless transceiver capabilities, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and a wireless terminal device in a smart home, but is not limited thereto. It is understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. It is known to those skilled in the art that with the evolution of system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems. The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are illustrative only. The communication system may include all or part of the entities shown in FIG1A , or may include other entities other than those shown in FIG1A . The number and form of the entities may be arbitrary. The connection relationship between the entities is illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0215] The embodiments of the present disclosure may be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5th generation mobile communication system-Advanced (5G-Advanced), 6th generation mobile communication system (6G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, a combination of multiple systems (for example, a combination of LTE or LTE-A with 5G) may also be employed.

[0216] In some embodiments, machine learning algorithms are one of the most important implementation methods of artificial intelligence technology. Machine learning can generate models from large amounts of training data, which can then be used to predict events. In many fields, models trained using machine learning can produce highly accurate predictions.

[0217] In some embodiments, AI can be used in 5G systems for prediction and reasoning to improve system performance. For example, in 3GPP Rel-19, AI is being studied to predict cell-level and beam-level measurement results, as well as to predict measurement events.

[0218] In some embodiments, downlink and uplink transmissions in the 5G wireless air interface are organized into frames of 10 ms duration, each frame consisting of 10 subframes of 1 ms. Each frame is identified by a System Frame Number (SFN), which ranges from 0 to 1023 and then loops back to 0. The 6 Most Significant Bits (MSBs) of the SFN are transmitted in the Master Information Block (MIB), and the 4 Least Significant Bits (LSBs) are indicated by the channel coding of the Physical Broadcast Channel (PBCH). Subframes are numbered from 0 to 9. The slot duration is 14 symbols with a regular cyclic prefix (CP) and 12 symbols with an extended CP, which varies over time and is a function of the subcarrier spacing. When the subcarrier spacing is 15 kHz, there is one time slot in one subframe and 10 time slots in one frame, numbered from 0 to 9. When the subcarrier spacing is 30 kHz, there are two time slots in one subframe, numbered from 0 and 1, and 20 time slots in one frame, numbered from 0 to 19. When the subcarrier spacing is 60 kHz, there are four time slots in one subframe, numbered from 0 to 3, and 40 time slots in one frame, numbered from 0 to 39. The same applies to subcarrier spacings of 120 kHz, 240 kHz, 480 kHz, and 960 kHz.

[0219] FIG1B is an exemplary schematic diagram illustrating a terminal switching from a source cell of a source base station to a target cell of a target base station according to an embodiment of the present disclosure. As shown in FIG1B :

[0220] In step 1, the terminal moves from the source base station to the destination base station. The source base station decides to initiate a handover and switches the terminal from the source cell of the source base station to the destination cell of the destination base station. The source base station sends a handover request message HANDOVER REQUEST to the destination base station through the Xn interface.

[0221] In step 2, after receiving the handover request message, the target base station performs admission control on the terminal and decides to accept the handover of the terminal to the cell of the target terminal.

[0222] In step 3, the target base station sends a handover request confirmation message HANDOVER REQUEST ACKNOWLEDGE to the source base station. It should be noted that the handover request confirmation message includes a radio resource control reconfiguration message RRCReconfiguration, and the radio resource control reconfiguration message includes the handover information of the terminal.

[0223] In step 4, the source base station sends an RRCReconfiguration message to the terminal, where the RRCReconfiguration message includes handover information of the terminal.

[0224] In step 5, after receiving the RRCReconfiguration message, the terminal obtains the handover information included in the RRCReconfiguration message, and immediately switches from the source cell of the source base station to the target cell of the target base station according to the handover information.

[0225] In step 6, after switching to the target cell of the target base station, the terminal sends a radio resource control reconfiguration completion message RRCReconfigurationComplete to the target base station as a response.

[0226] In the above embodiment, when the terminal receives the RRCReconfiguration message containing the handover information, the terminal will immediately execute the corresponding handover process according to the handover information contained in the received RRCReconfiguration message. However, it is difficult for the destination base station to choose the appropriate time to send the RRCReconfiguration message containing the handover information. If the destination base station sends the RRCReconfiguration message containing the handover information too early, the quality of the wireless channel between the terminal and the destination base station may be poor, resulting in handover failure. If the destination base station sends the RRCReconfiguration message containing the handover information too late, the quality of the wireless channel between the terminal and the source base station may be poor, resulting in the source base station being unable to successfully send the RRCReconfiguration message containing the handover information to the terminal, making it impossible for the terminal to perform the handover operation; at the same time, due to the poor quality of the wireless channel between the terminal and the source base station, a radio link failure (RLF) may also occur.

[0227] FIG2 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2 , the embodiment of the present disclosure relates to a communication method for a communication system 100, the method comprising:

[0228] Step S2101: The source base station sends a first message to the destination base station.

[0229] In some embodiments, the terminal has a wireless network connection with a source cell of a source base station. During movement from the source base station to the destination base station, the terminal sends a measurement report to the source base station. The measurement report includes, but is not limited to, signal strength of the source cell, signal strength of cells adjacent to the source cell, and PCI information.

[0230] In some embodiments, the source base station determines the access cell to which the terminal should be handed over based on the measurement report and other information sent by the terminal (e.g., the load of the source cell, the terminal's mobility restrictions, and the wireless capabilities). The source base station sends a first message to the target base station via the Xn interface, where the first message is used to request that the terminal be handed over from the source cell of the source base station to the target cell of the target base station.

[0231] Optionally, the first message may be an Xn message, such as a handover request confirmation message HANDOVER REQUEST, or a message customized by the device manufacturer or the device operator. The embodiment of the present application does not limit the specific type of the first message.

[0232] In some optional embodiments, the first message includes first information, where the first information is the time when the source base station instructs the terminal to perform switching.

[0233] It should be noted that in the embodiment of the present application, the source base station and the destination base station include but are not limited to: 4G base station, 5G base station, 6G base station; the embodiment of the present application does not limit the type of the source base station or the destination base station.

[0234] Step S2102: The target base station determines the time when the terminal performs handover.

[0235] In some embodiments, the destination base station determines a first indication in response to the first message, where the first indication is used to indicate a time when the terminal performs handover.

[0236] In some embodiments, if the first message includes first information, the destination base station uses the first information as auxiliary information for determining the first indication.

[0237] Optionally, the destination base station may determine the first instruction according to the time when the source base station instructs the terminal to perform handover, which is included in the first information.

[0238] In some embodiments, the first indication includes a delay time for the terminal to perform the handover, and is used to instruct the terminal to wait for the delay time before performing the handover after receiving the first indication.

[0239] In some embodiments, a delay duration reconfigDelay-r19 may be added to the RRCReconfiguration message of 3GPP TS 38.331, where the suffix r19 of reconfigDelay indicates that it was introduced in 3GPP Rel-19. The delay duration may also be introduced in other 3GPP Releases, and the suffix will change accordingly. For example, when introduced in Rel-20, the suffix is ​​r20, i.e., reconfigDelay-r20.

[0240] It should be noted that in the embodiment of the present application, the delay time for the terminal to execute switching is not a fixed value, and can be set by the equipment manufacturer or equipment operator. For example, it can be 5ms, 10ms, 15ms, 20ms, 30ms, etc. The embodiment of the present application does not limit the delay time of the terminal switching.

[0241] In some embodiments, a description of terminal behavior may be added in Section 5.3.5.3 of 3GPP TS 38.331. For example, the terminal shall perform the following actions upon receiving RRCReconfiguration or performing conditional reconfiguration (CHO, CPA, or CPC):

[0242] If RRCReconfiguration is applied due to conditional reconfiguration performed when selecting a cell while timer T311 is running, as defined in section 5.3.7.3, all entries in MCG and SCG VarConditionalReconfig are deleted.

[0243] If RRCReconfiguration includes reconfigDelay, the following operations are performed after the reconfiguration delay, including:

[0244] If RRCReconfiguration includes daps-SourceRelease, reset the source MAC and release the source MAC configuration;

[0245] For each DAPS bearer, it also includes:

[0246] Release the RLC entity and the related logical channels of the source SpCell as specified in clause 5.1.3 of TS 38.322[4];

[0247] As specified in TS 38.323 [5], the PDCP entity is reconfigured to release the DAPS.

[0248] It should be noted that, in the above embodiment, “if RRCReconfiguration includes reconfigDelay, perform the following operations after reconfiguration delay” is a newly added content in Section 5.3.5.3 of 3GPP TS 38.331 in the embodiment of the present disclosure.

[0249] In some embodiments, the first indication includes the time when the terminal performs the handover, and the time when the terminal performs the handover is indicated by a GPS standard clock or a UTC standard clock. It can be understood that the time when the terminal performs the handover included in the first indication uses a standard time, for example, the time indicated by the GPS standard clock or the time indicated by the UTC standard clock.

[0250] It should be noted that in the embodiment of the present application, whether to use the time indicated by the GPS standard clock or the time indicated by the UTC standard clock can be set by the equipment manufacturer or equipment operator, and is not limited in the embodiment of the present application.

[0251] In some embodiments, the first indication includes a timing relationship of a wireless air interface, where the wireless air interface is a wireless air interface of a cell of a source base station or a target base station; and the timing relationship is one of an uplink timing relationship and a downlink timing relationship.

[0252] In some embodiments, a terminal may communicate with multiple cells at the source base station, and may also communicate with multiple cells at the destination base station after handover. The timing relationship of the radio air interface of each cell may be different. Therefore, the handover time indicated by the destination base station is the handover time of a specific serving cell. For example: the PCell in the source base station or master node (MN), the PSCell of the source secondary node (SN), the PCell of the destination base station, the PSCell of the destination secondary node (SN), etc.

[0253] In some embodiments, the timing relationship of the wireless air interface includes any one of a system frame number, a subframe number, a time slot number, and an orthogonal frequency division multiplexing (OFDM) symbol number. It can be understood that the moment when the terminal performs handover can be represented by at least one of the system frame number, the subframe number, the time slot number, and the orthogonal frequency division multiplexing (OFDM) symbol number.

[0254] In some embodiments, the timing relationship of the wireless air interface is: the system frame number of the system frame in which the terminal performs the handover.

[0255] In some embodiments, the timing relationship of the wireless air interface is: the system frame number of the system frame where the subframe in which the terminal performs the handover is located and the subframe number of the subframe.

[0256] In some embodiments, the timing relationship of the wireless air interface is any one of the following:

[0257] The system frame number of the system frame in which the timeslot to which the terminal performs handover is located and the timeslot number of the timeslot;

[0258] The system frame number of the system frame where the time slot where the terminal performs switching is located, the subframe number of the subframe where the time slot is located, and the time slot number of the time slot.

[0259] In some embodiments, the timing relationship of the wireless air interface is any one of the following:

[0260] The system frame number of the system frame where the OFDM symbol to be switched by the terminal is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol;

[0261] The system frame number of the system frame where the OFDM symbol to be switched by the terminal is located, the timeslot number of the timeslot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol;

[0262] The terminal performs switching on the system frame number of the system frame where the OFDM symbol is located, the subframe number of the subframe where the OFDM symbol is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol.

[0263] In some embodiments, when the first indication includes the timing relationship between the terminal's handover execution time and the wireless air interface, a selection structure can be used to select a method. For example, referenceSFN-AndSlot can be used to indicate the SFN system frame number and the timeslot number within the system frame; referenceTime can be used to indicate GPS time. In this embodiment, the timing relationship of the wireless air interface uses the downlink timing relationship of the current PCell.

[0264] In some embodiments, the RRCReconfiguration message includes a reconfigTime, where the reconfigTime indicates the time at which the terminal performs the handover. If the reconfigTime is expressed as a referenceTime, the reconfigTime indicates the time from the GPS origin in 10 ns, where the referenceTime is calculated as follows: refDays*86400*1000*100000+refSeconds*1000*100000+refMilliSeconds*100000+refTenNanoSeconds.

[0265] The refDays field specifies the number of consecutive days starting from the GPS origin time, which is 00:00:00 on January 6, 1980. The refSeconds field specifies the number of seconds in fractions of a day. The refMilliSeconds field specifies the number of milliseconds in fractions of a second. The refTenNanoSeconds field specifies the number of 10-ns time units in fractions of a millisecond. If the reconfigTime field indicates referenceSFN-AndSlot, this number refers to the downlink time of the most recent system frame and timeslot serving the PCell.

[0266] In some embodiments, the description of UE behavior may be newly added in Section 5.3.5.3 of 3GPP TS 38.331. The terminal shall perform the following actions upon receiving RRCReconfiguration or upon performing conditional reconfiguration (CHO, CPA, or CPC):

[0267] If RRCReconfiguration is applied due to conditional reconfiguration performed when selecting a cell while timer T311 is running, as defined in section 5.3.7.3, all entries in MCG and SCG VarConditionalReconfig are deleted.

[0268] If RRCReconfiguration includes reconfigTime, perform the following operations at reconfigTime, including:

[0269] If RRCReconfiguration includes daps-SourceRelease, reset the source MAC and release the source MAC configuration;

[0270] For each DAPS bearer, it also includes:

[0271] Release the RLC entity and the related logical channels of the source SpCell as specified in clause 5.1.3 of TS 38.322[4];

[0272] As specified in TS 38.323 [5], the PDCP entity is reconfigured to release the DAPS.

[0273] It should be noted that, in the above embodiment, “if RRCReconfiguration includes reconfigTime: perform the following operations at reconfigTime” is a newly added content in Section 5.3.5.3 of 3GPP TS 38.331 in the embodiment of the present disclosure.

[0274] For example, the timing relationship of the wireless air interface is the uplink timing relationship of the PCell in the source base station. When the target base station determines the first indication, the system frame number in the uplink timing relationship of the PCell in the source base station is 100.

[0275] If the first indication includes the system frame number 900 , the first indication is used to instruct the terminal to perform switching at the beginning of the system frame with the system frame number 900 .

[0276] If the first indication includes the system frame number 900 and the subframe number 10, the first indication is used to instruct the terminal to perform switching starting from the 10th subframe in the system frame numbered 900.

[0277] If the first indication includes the system frame number 900, the subframe number 10, and the time slot number 2, the first indication is used to instruct the terminal to perform switching at the beginning of the second time slot of the 10th subframe in the system frame numbered 900.

[0278] If the first indication includes the system frame number 900 , the subframe number 10 and the OFDM symbol number 2 , the first indication is used to instruct the terminal to perform switching at the beginning of the second OFDM symbol of the 10th subframe in the system frame numbered 900 .

[0279] In an embodiment of the present application, downlink and uplink transmissions in the 5G wireless air interface are organized into frames of 10ms duration, each frame consisting of 10 subframes of 1ms. Each frame is identified by a system frame number (SFN), where the system frame number ranges from 0 to 1023; it can be understood that the system frame number increases from 0 to 1023, and then returns to 0 to start the cycle. If the system frame number corresponding to the timing relationship of the current wireless air interface is 900, and the timing relationship of the wireless air interface included in the first indication is system frame number 100, then the terminal performs switching at the beginning of the 100th system frame in the next round.

[0280] It should be noted that in the embodiment of the present application, the timing relationship between different cells of the source base station or the destination base station may be the same or different; therefore, the destination base station needs to specify which cell's timing relationship the timing relationship of the wireless air interface is. For example: if the timing relationship of the PCell in the source base station is used, then the destination base station or the destination secondary node (SN) needs to calculate how to indicate the switching moment of the terminal based on the timing relationship of the PCell of the source base station. If the timing relationship of the PSCell in the source SN is used, then the destination SN needs to calculate how to indicate the switching moment of the terminal based on the timing relationship of the PSCell in the source SN.

[0281] Step S2103: The destination base station sends the time when the terminal performs handover to the source base station.

[0282] In some embodiments, after the destination base station determines the first indication, it sends a second message to the source base station, and the second message is used to indicate that the destination base station accepts switching the terminal from the source cell of the source base station to the destination cell of the destination base station; wherein the second message includes a third message, and the third message is used to indicate that the terminal is switched from the source cell of the source base station to the destination cell of the destination base station.

[0283] In some embodiments, the second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0284] In some optional embodiments, the third message further includes handover information, where the handover information includes but is not limited to an identifier and frequency information of the target cell.

[0285] It should be noted that, in the embodiment of the present application, the second message may be an Xn message, such as HANDOVER REQUEST ACKNOWLEDGE, or a message customized by the device manufacturer or device operator. The embodiment of the present application does not limit the specific type of the second message.

[0286] Optionally, the third message may be an RRC message, such as a radio resource control reconfiguration message RRCReconfiguration; or a message customized by a device manufacturer or a device operator. The embodiment of the present application does not limit the specific type of the third message.

[0287] It should be noted that in the embodiments of the present application, the source base station generally only parses the second message, and does not parse the third message included in the second message. Therefore, when the second message includes the third message and the first indication, the source base station parses the second message to obtain the first indication, thereby knowing the time when the terminal performs handover. After the terminal performs handover, the source base station will no longer send data or signaling to the terminal, thus avoiding waste of resources.

[0288] Step S2104: The source base station sends the terminal the time at which the terminal performs handover.

[0289] In some embodiments, the source base station receives a second message, where the second message is used to instruct the target base station to accept handover of the terminal from the source cell of the source base station to the target cell of the target base station.

[0290] In some optional embodiments, if the second message includes the third message and the first indication, the source base station sends the third message and the first indication to the terminal.

[0291] In some optional embodiments, if the third message includes the first indication, the source base station sends the third message to the terminal, where the third message includes the first indication.

[0292] In some optional embodiments, the source base station receives a fourth message sent by the terminal, where the fourth message is used to indicate that the terminal has received the first indication.

[0293] It should be noted that in the embodiment of the present application, the fourth message may be an RRC message; or it may be a message customized by the device manufacturer or device operator. The embodiment of the present application does not limit the specific type of the fourth message.

[0294] Step S2105 : The terminal is handed over from the source cell of the source base station to the destination cell of the destination base station.

[0295] In some optional embodiments, after receiving the first indication, the terminal sends a fourth message to the source base station, where the fourth message is used to indicate that the terminal has received the first indication.

[0296] In some embodiments, the terminal switches from the source cell of the source base station to the target cell of the target base station according to the switching information included in the third message and the time when the terminal performs switching indicated by the first indication.

[0297] In some embodiments, after the terminal handover is completed, a fifth message is sent to the target base station, where the fifth message is used to indicate that the terminal has been handed over from the source cell of the source base station to the target cell of the target base station.

[0298] Optionally, the fifth message may be an RRC message, such as a radio resource control reconfiguration complete message RRCReconfigurationComplete; or a message customized by a device manufacturer or a device operator. The embodiment of the present application does not limit the specific type of the fifth message.

[0299] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0300] FIG3 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG3 , the embodiment of the present disclosure relates to a destination base station 101 of a terminal, and the method includes:

[0301] Step S3101: Receive a first message sent by a source base station.

[0302] For optional implementations of step S3101, reference may be made to the optional implementations of step 2102 in FIG2 and other related parts in the embodiment involved in FIG2 , which will not be described in detail here.

[0303] In some embodiments, the source base station sends a first message to the target base station via an Xn interface, where the first message is used to request handover of the terminal from a source cell of the source base station to a target cell of the target base station.

[0304] In some optional embodiments, the first message includes first information, where the first information is the time when the source base station instructs the terminal to perform switching.

[0305] Step S3102: Determine the time when the terminal performs switching.

[0306] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0307] In some embodiments, the destination base station determines a first indication in response to the first message, where the first indication is used to indicate a time when the terminal performs handover.

[0308] In some embodiments, if the first message includes first information, the destination base station uses the first information as auxiliary information for determining the first indication.

[0309] Optionally, the destination base station may determine the first instruction based on the time when the source base station instructs the terminal to perform the handover, as included in the first information. In some embodiments, if the first message does not include the time when the source base station instructs the terminal to perform the handover, the time when the terminal performs the handover is determined according to any one of the following methods, including:

[0310] The duration for which the terminal delays executing the handover;

[0311] Timing relationships of the wireless air interface;

[0312] The moment when the terminal performs switching.

[0313] In some embodiments, the timing relationship of the wireless air interface includes any one of a system frame number, a subframe number, a time slot number, and an orthogonal frequency division multiplexing (OFDM) symbol number. It can be understood that the moment when the terminal performs handover can be represented by at least one of the system frame number, the subframe number, the time slot number, and the orthogonal frequency division multiplexing (OFDM) symbol number.

[0314] Step S3103: Send the time when the terminal performs handover to the source base station.

[0315] The optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0316] In some embodiments, after the destination base station determines the first indication, it sends a second message to the source base station, the second message being used to instruct the destination base station to accept handover of the terminal from the source cell of the source base station to the destination cell of the destination base station; wherein the second message includes a third message, the third message being used to instruct the terminal to handover from the source cell of the source base station to the destination cell of the destination base station; the second message or the third message includes the first indication

[0317] In some optional embodiments, the third message further includes handover information, and the handover information includes but is not limited to an identifier and frequency information of the target cell.

[0318] Step S3104: Receive the fifth message sent by the terminal.

[0319] The optional implementation of step S3104 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0320] In some embodiments, a fifth message sent by the terminal is received, where the fifth message is used to indicate that the terminal has been handed over from a source cell of a source base station to a target cell of a target base station.

[0321] FIG4 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG4 , the embodiment of the present disclosure relates to a source base station 102 of a terminal, and the method includes:

[0322] Step S4101: Send a first message to a destination base station.

[0323] The optional implementation of step S4101 can refer to the optional implementation of step S2101 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0324] In some embodiments, the source base station sends a first message to the target base station via an Xn interface, where the first message is used to request handover of the terminal from a source cell of the source base station to a target cell of the target base station.

[0325] In some optional embodiments, the first message includes first information, where the first information is the time when the source base station instructs the terminal to perform switching.

[0326] Step S4102: Receive the time when the terminal performs handover sent by the destination base station.

[0327] The optional implementation of step S4102 can refer to the optional implementation of step S2103 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0328] In some embodiments, a second message sent by the destination base station is received, and the second message is used to indicate that the destination base station accepts switching the terminal from the source cell of the source base station to the destination cell of the destination base station; wherein the second message includes a third message, and the third message is used to indicate that the terminal is switched from the source cell of the source base station to the destination cell of the destination base station.

[0329] In some embodiments, the second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0330] In some optional embodiments, the third message further includes handover information, and the handover information includes but is not limited to an identifier and frequency information of the target cell.

[0331] Step S4103: Send the time when the terminal performs handover to the terminal.

[0332] The optional implementation of step S4103 can refer to the optional implementation of step S2104 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0333] In some optional embodiments, if the second message includes the third message and the first indication, the source base station sends the third message and the first indication to the terminal.

[0334] In some optional embodiments, if the third message includes the first indication, the source base station sends the third message to the terminal.

[0335] In some embodiments, the first indication is used to indicate a moment when the terminal performs handover.

[0336] Step S4104: receiving the fourth message sent by the terminal.

[0337] The optional implementation of step S4104 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0338] In some optional embodiments, the source base station receives a fourth message sent by the terminal, where the fourth message is used to indicate that the terminal has received the first indication.

[0339] It should be noted that in the embodiment of the present application, step S4104 is an optional step.

[0340] FIG5 is a flow chart of a communication method according to an embodiment of the present disclosure. As shown in FIG5 , the embodiment of the present disclosure involves a terminal 103, and the method includes:

[0341] Step S5101: Receive the time when the terminal performs handover sent by the source base station.

[0342] The optional implementation of step S5101 can refer to the optional implementation of step S2104 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0343] In some optional embodiments, the terminal receives the third message and the first indication sent by the source base station.

[0344] In some optional embodiments, the terminal receives a third message sent by the source base station, where the third message includes the first indication.

[0345] In this embodiment of the present application, the first indication is used to indicate the moment when the terminal performs switching.

[0346] Step S5102: Send a fourth message to the source base station.

[0347] The optional implementation of step S5102 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0348] In some optional embodiments, after receiving the first indication, the terminal sends a fourth message to the source base station, where the fourth message is used to indicate that the terminal has received the first indication.

[0349] It should be noted that, in the embodiment of the present application, step S5102 is an optional step.

[0350] Step S5103: The terminal is handed over from the source cell of the source base station to the destination cell of the destination base station.

[0351] The optional implementation of step S5103 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0352] In some embodiments, the terminal switches from the source cell of the source base station to the target cell of the target base station according to the switching information included in the third message and the time when the terminal performs switching indicated by the first indication.

[0353] Step S5104: Send a fifth message to the destination base station.

[0354] The optional implementation of step S5104 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0355] In some embodiments, after the terminal handover is completed, a fifth message is sent to the target base station, where the fifth message is used to indicate that the terminal has been handed over from the source cell of the source base station to the target cell of the target base station.

[0356] FIG6 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG6 , the embodiment of the present disclosure relates to a communication method for a communication system 100, the method comprising:

[0357] Step S6101: The source base station sends a first message to the destination base station.

[0358] The optional implementation of step S6101 can refer to the optional implementation of step S2101 in Figure 2, step S3101 in Figure 3, step S4101 in Figure 4, and other related parts in the embodiments involved in Figures 2, 3, and 4, which will not be repeated here.

[0359] In some embodiments, the source base station sends a first message to the target base station via an Xn interface, where the first message is used to request handover of the terminal from a source cell of the source base station to a target cell of the target base station.

[0360] In some optional embodiments, the first message includes first information, where the first information is the time when the source base station instructs the terminal to perform switching.

[0361] Step S6102: The destination base station determines the time when the terminal performs handover.

[0362] Optional implementations of step S6102 may refer to step S2101 in FIG. 2 , step S3102 in FIG. 3 , and other related parts in the embodiments involved in FIG. 2 and FIG. 3 , which will not be described in detail here.

[0363] In some embodiments, the destination base station determines a first indication in response to the first message, where the first indication is used to indicate a time when the terminal performs handover.

[0364] In some embodiments, if the first message includes first information, the destination base station uses the first information as auxiliary information for determining the first indication.

[0365] Optionally, the destination base station may determine the first instruction according to the time when the source base station instructs the terminal to perform handover, which is included in the first information.

[0366] In some embodiments, if the first message does not include the time when the source base station instructs the terminal to perform the handover, the time when the terminal performs the handover is determined according to any one of the following methods, including:

[0367] The duration for which the terminal delays executing the handover;

[0368] Timing relationships of the wireless air interface;

[0369] The moment when the terminal performs switching.

[0370] Step S6103: The destination base station sends the time when the terminal performs handover to the source base station.

[0371] The optional implementation of step S6103 can refer to the optional implementation of step S2102 in Figure 2, step S3103 in Figure 3, step S4102 in Figure 4, and other related parts in the embodiments involved in Figures 2, 3, and 4, which will not be repeated here.

[0372] In some embodiments, after the destination base station determines the first indication, it sends a second message to the source base station, and the second message is used to indicate that the destination base station accepts switching the terminal from the source cell of the source base station to the destination cell of the destination base station; wherein the second message includes a third message, and the third message is used to indicate that the terminal is switched from the source cell of the source base station to the destination cell of the destination base station.

[0373] In some embodiments, the second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0374] In some optional embodiments, the third message further includes handover information, and the handover information includes but is not limited to an identifier and frequency information of the target cell.

[0375] Step S6104: The source base station sends the terminal the time at which the terminal performs handover.

[0376] The optional implementation of step S6104 can refer to the optional implementation of step S2103 in Figure 2, step S4103 in Figure 4, step S5101 in Figure 5, and other related parts in the embodiments involved in Figures 2, 4 and 5, which will not be repeated here.

[0377] In some optional embodiments, if the second message includes the third message and the first indication, the source base station sends the third message and the first indication to the terminal.

[0378] In some optional embodiments, if the third message includes the first indication, the source base station sends the third message to the terminal.

[0379] In some embodiments, the first indication is used to indicate a moment when the terminal performs handover.

[0380] Step S6105: The terminal sends a fourth message to the source base station.

[0381] The optional implementation of step S6105 can refer to the optional implementation of step S2104 in Figure 2, step S4104 in Figure 4, step S5102 in Figure 5, and other related parts in the embodiments involved in Figures 2, 4 and 5, which will not be repeated here.

[0382] In some optional embodiments, after receiving the first indication, the terminal sends a fourth message to the source base station, where the fourth message is used to indicate that the terminal has received the first indication.

[0383] It should be noted that step S6105 in the embodiment of the present application is an optional step.

[0384] Step S6106: The terminal is handed over from the source cell of the source base station to the destination cell of the destination base station.

[0385] The optional implementation of step S6106 can refer to the optional implementation of step S2105 in Figure 2, step S5103 in Figure 5, and other related parts in the embodiments involved in Figures 2 and 5, which will not be repeated here.

[0386] In some embodiments, the terminal releases the wireless network connection with the source cell of the source base station and establishes a wireless network connection with the destination cell of the destination base station according to the switching information included in the third message and the time of performing the switching indicated by the first indication.

[0387] Step S6107: The terminal sends a fifth message to the destination base station.

[0388] The optional implementation of step S6107 can refer to the optional implementation of step S2105 in Figure 2, step S3104 in Figure 3, step S5104 in Figure 5, and other related parts in the embodiments involved in Figures 2, 3, and 5, which will not be repeated here.

[0389] In some embodiments, after the terminal handover is completed, a fifth message is sent to the target base station, where the fifth message is used to indicate that the terminal has been handed over from the source cell of the source base station to the target cell of the target base station.

[0390] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing each step performed by the destination base station 101 of the terminal in any of the above methods. For another example, another apparatus is provided that includes units or modules for implementing each step performed by the source base station 102 of the terminal in any of the above methods.

[0391] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0392] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0393] FIG7A is a schematic diagram of the structure of a destination base station of a terminal according to an embodiment of the present disclosure. As shown in FIG7A , the destination base station of the terminal may include: a receiving module 7101 and a processing module 7102 .

[0394] In some embodiments, the receiving module is used to receive a first message sent by a source base station of the terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station.

[0395] In some embodiments, the processing module is used to determine a first indication based on the first message, where the first indication is used to indicate a time when the terminal performs switching.

[0396] Optionally, the above-mentioned receiving module is used to execute the communication steps such as sending and / or receiving performed by the terminal in any of the above methods, such as step S3101, which will not be repeated here.

[0397] FIG7B is a schematic diagram of the structure of a source base station of a terminal according to an embodiment of the present disclosure. As shown in FIG7B , the source base station of the terminal may include: a receiving module 7201 .

[0398] In some embodiments, the receiving module is configured to receive a second message sent by a destination base station, where the second message is configured to instruct the destination base station to accept handover of the wireless network connection of the terminal from the source cell of the source base station to the destination cell of the destination base station;

[0399] The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station;

[0400] The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

[0401] Optionally, the above-mentioned receiving module is used to execute the communication steps such as sending and / or receiving performed by the terminal in any of the above methods, such as step S4101, which will not be repeated here.

[0402] FIG7C is a schematic diagram of the structure of a terminal proposed in an embodiment of the present disclosure. As shown in FIG7C , the terminal may include: a receiving module 7301 .

[0403] In some embodiments, the receiving module is configured to receive a third message and a first indication sent by the second device; or,

[0404] receiving the third message sent by the second device, where the third message includes the first indication;

[0405] The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

[0406] Optionally, the sending module is used to execute the communication steps such as sending and / or receiving performed by the terminal in any of the above methods, such as step S5101, which will not be repeated here.

[0407] Figure 8A is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. Communication device 8100 can be a device (e.g., an access network device, a core network device, etc.), or an IoT device, or a chip, chip system, or processor that supports the device in implementing any of the above methods. Communication device 8100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0408] As shown in Figure 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 8100 is used to perform any of the above methods. Optionally, one or more processors 8101 are used to call instructions to enable the communication device 8100 to perform any of the above methods.

[0409] In some embodiments, the communication device 8100 further includes one or more transceivers 8102. When the communication device 8100 includes one or more transceivers 8102, the transceiver 8102 performs at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, but not limited thereto), and the processor 8101 performs at least one of the other steps (for example, step S2102, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be interchangeable, the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be interchangeable, and the terms receiver, receiving unit, receiver, and receiving circuit may be interchangeable.

[0410] In some embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Alternatively, all or part of the memories 8103 may be located outside the communication device 8100. In alternative embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuits 8104 are connected to the memories 8103 and may be configured to receive data from the memories 8103 or other devices, or to send data to the memories 8103 or other devices. For example, the interface circuits 8104 may read data stored in the memories 8103 and send the data to the processor 8101.

[0411] The communication device 8100 described in the above embodiments may be a device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 8A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0412] FIG8B is a schematic diagram of the structure of a chip 8200 according to an embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in FIG8B , but the present disclosure is not limited thereto.

[0413] The chip 8200 includes one or more processors 8201. The chip 8200 is configured to execute any of the above methods.

[0414] In some embodiments, chip 8200 further includes one or more interface circuits 8202. Terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 8200 further includes one or more memories 8203 for storing data. Alternatively, all or part of memory 8203 may be located external to chip 8200. Optionally, interface circuit 8202 is connected to memory 8203 and may be used to receive data from memory 8203 or other devices, or may be used to send data to memory 8203 or other devices. For example, interface circuit 8202 may read data stored in memory 8203 and send the data to processor 8201.

[0415] In some embodiments, the interface circuit 8202 performs at least one of the communication steps (e.g., step S2101, but not limited thereto) in the above method, such as sending and / or receiving. The interface circuit 8202 performing the communication steps (e.g., sending and / or receiving) in the above method, for example, means that the interface circuit 8202 performs data exchange between the processor 8201, chip 8200, memory 8203, or a transceiver device. In some embodiments, the processor 8201 performs at least one of the other steps (e.g., step S2102, but not limited thereto).

[0416] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 8100, causes the communication device 8100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto, and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto, and may also be a temporary storage medium.

[0417] The present disclosure also provides a program product, which, when executed by the communication device 8100, enables the communication device 8100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0418] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

Claims

1. A communication method, characterized in that: The method is performed by a destination base station of the terminal, and the method includes: Receiving a first message sent by a source base station of a terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station; A first indication is determined according to the first message, where the first indication is used to indicate a time when the terminal performs switching.

2. The method according to claim 1, characterized in that The first message includes first information, and the destination base station determines the first indication according to the first information; The first information includes the time when the source base station instructs the terminal to perform handover.

3. The method according to claim 1 or 2, characterized in that The moment when the terminal performs the handover is represented by any of the following methods: The duration for which the terminal delays performing the handover; Timing relationships of the wireless air interface; The clock time at which the terminal performed the handover.

4. The method according to claim 3, characterized in that The wireless air interface is a wireless air interface of a cell of the source base station or the destination base station; The timing relationship is one of an uplink timing relationship and a downlink timing relationship.

5. The method according to claim 4, characterized in that The cell of the source base station or the target base station is any one of the following: The primary cell PCell of the source base station; The primary and secondary cells (PSCells) of the source base station; The primary cell PCell of the target base station; The target base station is a primary or secondary cell (PSCell).

6. The method according to any one of claims 3 to 5, characterized in that: The timing relationship of the wireless air interface includes: Any one of the system frame number, subframe number, time slot number and orthogonal frequency division multiplexing (OFDM) symbol number.

7. The method according to claim 6, characterized in that The time when the terminal performs the handover is represented by the system frame number at which the terminal performs the handover.

8. The method according to claim 6, characterized in that The time when the terminal performs switching is represented by the system frame number of the system frame where the subframe in which the terminal performs switching is located and the subframe number of the subframe.

9. The method according to claim 6, characterized in that The moment when the terminal performs the handover is represented by any of the following methods: The system frame number of the system frame in which the time slot in which the terminal performs handover is located and the time slot number of the time slot; The system frame number of the system frame where the time slot where the terminal performs switching is located, the subframe number of the subframe where the time slot is located, and the time slot number of the time slot.

10. The method according to claim 6, characterized in that The moment when the terminal performs the handover is represented by any of the following methods: The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; The terminal performs switching on a system frame number of a system frame where the OFDM symbol is located, a subframe number of a subframe where the OFDM symbol is located, a time slot number of a time slot where the OFDM symbol is located, and an OFDM symbol number of the OFDM symbol.

11. The method according to claim 3, characterized in that The clock time at which the terminal performs the handover is indicated by a GPS standard clock or a UTC standard clock.

12. The method according to any one of claims 1 to 11, characterized in that The determining of the first indication further includes: Sending a second message to the source base station, where the second message is used to instruct the destination base station to accept handover of the terminal from the source cell of the source base station to the destination cell of the destination base station; The second message includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; The second message or the third message includes the first indication.

13. A communication method, characterized in that: The method is performed by a source base station of the terminal, and the method includes: receiving a second message sent by a destination base station, where the second message is used to instruct the destination base station to accept handover of a wireless network connection of a terminal from a source cell of the source base station to a destination cell of the destination base station; The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

14. The method according to claim 13, characterized in that The receiving of the second message sent by the destination base station also includes: Determining to switch the wireless network connection of the terminal from the source cell to the destination cell; A first message is sent to the target base station, where the first message is used to request handover of the wireless network connection of the terminal from the source cell to the target cell.

15. The method according to claim 13 or 14, characterized in that The receiving of the second message sent by the destination base station further includes: sending the second message to the terminal; The second message includes the third message, and the second message or the third message includes the first indication.

16. The method according to claim 15, characterized in that The sending of the second message and the third message to the terminal further includes: A fourth message sent by the terminal is received, where the fourth message is used to indicate that the terminal has received the first indication.

17. A communication method, characterized in that: The method is executed by a terminal, and includes: receiving a third message and a first indication sent by the second device; or, receiving the third message sent by the second device, where the third message includes the first indication; The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

18. The method according to claim 17, characterized in that The moment when the terminal performs the handover is represented by any of the following ways: The duration for which the terminal delays performing the handover; Timing relationships of the wireless air interface; The clock time at which the terminal performed the handover.

19. The method according to claim 18, characterized in that The wireless air interface is a wireless air interface of a cell of the source base station or the destination base station; The timing relationship is one of an uplink timing relationship and a downlink timing relationship.

20. The method according to claim 19, characterized in that The cell of the source base station or the target base station is any one of the following: The primary cell PCell of the source base station; The source base station primary and secondary cell PSCell; The primary cell PCell of the target base station; The target base station is a primary or secondary cell (PSCell).

21. The method according to any one of claims 18 to 20, characterized in that: The timing relationship of the wireless air interface includes: Any one of the system frame number, subframe number, time slot number and orthogonal frequency division multiplexing (OFDM) symbol number.

22. The method according to claim 21, characterized in that The time when the terminal performs the handover is represented by the system frame number at which the terminal performs the handover.

23. The method according to claim 21, characterized in that The time when the terminal performs switching is represented by the system frame number of the system frame where the subframe in which the terminal performs switching is located and the subframe number of the subframe.

24. The method according to claim 21, characterized in that The moment when the terminal performs the handover is represented by any of the following methods: The system frame number of the system frame in which the time slot in which the terminal performs handover is located and the time slot number of the time slot; The system frame number of the system frame where the time slot where the terminal performs switching is located, the subframe number of the subframe where the time slot is located, and the time slot number of the time slot.

25. The method according to claim 21, characterized in that The moment when the terminal performs the handover is represented by any of the following methods: The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the subframe number of the subframe where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; The system frame number of the system frame where the OFDM symbol on which the terminal performs switching is located, the time slot number of the time slot where the OFDM symbol is located, and the OFDM symbol number of the OFDM symbol; The terminal performs switching on a system frame number of a system frame where the OFDM symbol is located, a subframe number of a subframe where the OFDM symbol is located, a time slot number of a time slot where the OFDM symbol is located, and an OFDM symbol number of the OFDM symbol.

26. The method according to claim 18, wherein The clock time at which the terminal performs the handover is indicated by a GPS standard clock or a UTC standard clock.

27. The method according to any one of claims 17 to 26, characterized in that: The receiving the first indication sent by the source base station further includes: A fourth message is sent to the source base station, where the fourth message is used to indicate that the terminal has received the first indication.

28. The method according to any one of claims 17 to 27, characterized in that: The terminal is switched from the source cell of the source base station to the destination cell of the destination base station at the time indicated by the first indication.

29. The method according to claim 28, characterized in that The method then further comprises: A fifth message is sent to the destination base station, where the fifth message is used to indicate that the terminal has been handed over from the source cell of the source base station to the destination cell of the destination base station.

30. A destination base station of a terminal, characterized in that: include: a receiving module, configured to receive a first message sent by a source base station of a terminal, where the first message is used to request handover of the terminal from a source cell of the source base station to a destination cell of the destination base station; The processing module is used to determine a first indication according to the first message, where the first indication is used to indicate a time when the terminal performs switching.

31. A source base station of a terminal, characterized in that: include: a receiving module, configured to receive a second message sent by a destination base station, wherein the second message is used to instruct the destination base station to accept handover of the wireless network connection of the terminal from the source cell of the source base station to the destination cell of the destination base station; The second message further includes a third message, and the third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; The second message or the third message includes a first indication, where the first indication is used to indicate a time when the terminal performs handover.

32. A terminal, characterized in that: include: a receiving module, configured to receive a third message and a first indication sent by a second device; or receiving the third message sent by the second device, where the third message includes the first indication; The third message is used to instruct the terminal to switch from the source cell of the source base station to the destination cell of the destination base station; and the first indication is used to indicate the time when the terminal performs the handover.

33. A destination base station of a terminal, characterized in that: include: one or more processors; The processor is configured to execute the communication method according to any one of claims 1 to 12.

34. A source base station of a terminal, characterized in that include: one or more processors; The processor is configured to execute the communication method according to any one of claims 13 to 16.

35. A terminal, characterized in that: include: one or more processors; The processor is configured to execute the communication method according to any one of claims 17 to 29.

36. A communication system, characterized in that: include: The destination base station of the terminal is used to implement the communication method according to any one of claims 1 to 12; A source base station of a terminal, configured to implement the communication method according to any one of claims 13 to 16; A terminal, used to implement the communication method described in any one of claims 17-29.

37. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is caused to execute the communication method according to any one of claims 1 to 12, 13 to 16, and 17 to 29.

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