Communication method, first network element, terminal, second network element, and communication system

Abstract

The embodiments of the present disclosure relate to a communication method, a terminal, a first network element, a second network element, and a communication system. The communication method comprises: a first network element deciding to use a user plane to perform a first LCS session with a user equipment (UE), and the first network element determining a first LCS session identifier, wherein a message transmitted in the first LCS session comprises an LCS-session-related message, which is not completely transmitted on a control plane, of the UE and the first network element; and the first LCS session identifier is used for identifying the first LCS session. Thus, the message transmitted on the user plane and the message transmitted on the control plane are associated with the same LCS session.

Description

Communication method, first network element, terminal, second network element and communication system Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a communication method, a first network element, a terminal, a second network element, and a communication system. Background Art

[0002] Currently, in the field of wireless communications, messages can be transmitted between terminals and location management functions (LMFs). The user plane and control plane are two possible methods for transmitting messages between LMFs and terminals. When messages for the same LCS (Location Service) session are transmitted between a terminal and the LMF via both the control and user planes, it is not possible to associate messages transmitted on the user and control planes within the same LCS session.

[0003] Summary of the Invention

[0004] Embodiments of the present disclosure provide a communication method, a terminal, a first network element, a second network element, and a communication system to associate messages transmitted on a user plane and messages transmitted on a control plane into the same LCS session.

[0005] In a first aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0006] The first network element decides to use the user plane to conduct a first LCS session with the terminal UE, and the first network element determines a first LCS session identifier;

[0007] The messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE and the first network element on the control plane; and the first LCS session identifier is used to identify the first LCS session.

[0008] In a second aspect, an embodiment of the present disclosure further provides a communication method, the method comprising:

[0009] The terminal UE receives a second message sent by the second network element;

[0010] The second message includes: at least one of a user plane connection establishment command message, a second identifier, and a first LCS session identifier;

[0011] The first LCS session identifier is used to identify the first LCS session, and the messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE and the first network element on the control plane; the second identifier is used to identify the second LCS session between the first network element and the UE on the control plane.

[0012] In a third aspect, an embodiment of the present disclosure further provides a communication method, the method comprising:

[0013] The second network element receives the first message sent by the first network element;

[0014] The first message includes: at least one of a user plane connection establishment command message, a first identifier, and a first LCS session identifier;

[0015] The first LCS session identifier is used to identify the first LCS session, and the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane; the first identifier is used to identify the second LCS session between the first network element and the UE on the control plane.

[0016] In a fourth aspect, an embodiment of the present disclosure further provides a communication method, the method comprising:

[0017] The network device decides to use the user plane to conduct a first LCS session with the terminal UE, and determines the first LCS session identifier;

[0018] The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane.

[0019] In a fifth aspect, an embodiment of the present disclosure further provides a first network element, including:

[0020] The first processing module is configured to determine to use a user plane to conduct a first LCS session with the terminal UE; and determine a first LCS session identifier;

[0021] The messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE and the first network element on the control plane; and the first LCS session identifier is used to identify the first LCS session.

[0022] In a sixth aspect, an embodiment of the present disclosure further provides a terminal, including:

[0023] A first receiving module is configured to receive a second message sent by a second network element; wherein the first network element decides to use a user plane to conduct a first LCS session with the terminal UE;

[0024] The second message includes: at least one of a user plane connection establishment command message, a second identifier, and a first LCS session identifier;

[0025] The second identifier is used to identify the second LCS session between the first network element and the UE on the control plane; the first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane.

[0026] In a seventh aspect, an embodiment of the present disclosure further provides a second network element, including:

[0027] A second receiving module is configured to receive a first message sent by a first network element; wherein the first network element decides to use a user plane to conduct a first LCS session with the terminal UE;

[0028] The first message includes: at least one of a user plane connection establishment command message, a first identifier, and a first LCS session identifier;

[0029] The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane; the first identifier is used to identify the second LCS session conducted between the first network element and the UE on the control plane.

[0030] In an eighth aspect, an embodiment of the present disclosure further provides a network device, including:

[0031] A fourth processing module, configured to decide to use a user plane to conduct a first LCS session with the terminal UE, and determine a first LCS session identifier;

[0032] The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane.

[0033] In a ninth aspect, an embodiment of the present disclosure further provides a first network element, including:

[0034] one or more processors;

[0035] Among them, the first network element is used to execute the communication method described in the second aspect of the embodiment of this disclosure.

[0036] In a tenth aspect, an embodiment of the present disclosure further provides a terminal, including:

[0037] one or more processors;

[0038] The terminal is used to execute the communication method described in the first aspect of the embodiment of the present disclosure.

[0039] In an eleventh aspect, an embodiment of the present disclosure further provides a second network element, including:

[0040] one or more processors;

[0041] Among them, the first network element is used to execute the communication method described in the third aspect of the embodiment of this disclosure.

[0042] In a twelfth aspect, an embodiment of the present disclosure further provides a network device, including:

[0043] one or more processors;

[0044] The network device is used to execute the communication method described in the fourth aspect of the embodiment of the present disclosure.

[0045] In the thirteenth aspect, an embodiment of the present disclosure also provides a communication system, including a terminal, a first network element and a second network element; wherein, the terminal is configured to implement the communication method described in the first aspect of the embodiment of the present disclosure, the first network element is configured to implement the communication method described in the second aspect of the embodiment of the present disclosure, and the second network element is configured to implement the communication method described in the third aspect of the embodiment of the present disclosure.

[0046] In the fourteenth aspect, an embodiment of the present disclosure further provides a storage medium, which stores instructions. When the instructions are executed on a communication device, the communication device executes the communication method described in the first aspect, the communication method described in the second aspect, or the communication method described in the third aspect of the embodiment of the present disclosure.

[0047] In the embodiment of the present disclosure, the messages transmitted in the first LCS session include messages related to the LCS session that have not been completed between the UE and the first network element on the control plane, and the first LCS session identifier is used to identify the first LCS session. The first network element decides to use the user plane to conduct the first LCS session with the terminal UE, and determines the first LCS session identifier; in this way, after the first network element establishes a user plane connection with the UE, the first LCS session identifier can be directly used to identify the first LCS session between the first network element and the UE, and messages related to the LCS session that have not been completed on the control plane can continue to be transmitted, that is, the LCS sessions conducted on the user plane and the control plane are the same LCS session, and the messages transmitted on the user plane and the messages transmitted on the control plane are associated with the same LCS session.

[0048] Additional aspects and advantages of the embodiments of the present disclosure will be given in part in the following description, which will become apparent from the following description or be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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.

[0050] FIG1 is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure;

[0051] FIG2 is a schematic diagram of an exemplary interaction of a communication method according to an embodiment of the present disclosure;

[0052] FIG3 is a flow chart of a communication method according to an embodiment of the present disclosure;

[0053] FIG4 is a second flow chart of the communication method provided in an embodiment of the present disclosure;

[0054] FIG5 is a third flow chart of the communication method provided in an embodiment of the present disclosure;

[0055] FIG6 is a fourth flow chart of the communication method provided in an embodiment of the present disclosure;

[0056] FIG7 is a schematic structural diagram of a first network element proposed in an embodiment of the present disclosure;

[0057] FIG8 is a schematic diagram of a terminal structure according to an embodiment of the present disclosure;

[0058] FIG9 is a schematic structural diagram of a second network element proposed in an embodiment of the present disclosure;

[0059] FIG10 is a schematic diagram of a structure of a second network element according to an embodiment of the present disclosure;

[0060] FIG11 is a second schematic diagram of the structure of the terminal proposed in an embodiment of the present disclosure;

[0061] FIG12 is a schematic diagram of the structure of a chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0062] The embodiments of the present disclosure provide a communication method, a terminal, a first network element, a second network element, and a communication system.

[0063] In a first aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0064] The first network element decides to use the user plane to conduct a first LCS session with the terminal UE, and the first network element determines a first LCS session identifier;

[0065] The messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE and the first network element on the control plane; and the first LCS session identifier is used to identify the first LCS session.

[0066] In the above embodiment, the messages transmitted in the first LCS session include messages related to the LCS session that have not been completed between the UE and the first network element on the control plane, and the first LCS session identifier is used to identify the first LCS session. The first network element decides to use the user plane to conduct the first LCS session with the terminal UE, and determines the first LCS session identifier; in this way, after the first network element establishes a user plane connection with the UE, the first LCS session identifier can be directly used to identify the first LCS session between the first network element and the UE, and messages related to the LCS session that have not been completed on the control plane can continue to be transmitted, that is, the LCS sessions conducted on the user plane and the control plane are the same LCS session, and the messages transmitted on the user plane and the messages transmitted on the control plane are associated with the same LCS session.

[0067] In conjunction with some embodiments of the first aspect, in some embodiments,

[0068] The first LCS session identifier includes the first identifier or the second LCS session identifier;

[0069] The first identifier is used to identify the second LCS session conducted between the first network element and the UE on the control plane; the second LCS session identifier includes the LCS session identifier allocated by the first network element to the first LCS session.

[0070] In the above embodiment, the first network element can associate the first LCS session with the second LCS session by allocating an LCS session identifier to the first LCS session or using the first identifier as the session identifier of the first LCS session when it needs to continue to transmit LCS session-related messages that have not been completed on the control plane to the UE on the user plane.

[0071] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0072] During the message transmission process of the second LCS session, the first network element sends the first identifier to the second network element, or the first network element receives the first identifier sent by the second network element.

[0073] In the above embodiment, the first network element and the second network element may allocate an LCS session identifier for the first network element and the UE to conduct the second LCS session on the control plane.

[0074] In conjunction with some embodiments of the first aspect, in some embodiments, after the first network element determines the first LCS session identifier, the method further includes:

[0075] The first network element associates the first LCS session identifier and / or the first identifier with the first LCS session.

[0076] In the above embodiment, by associating the first LCS session identifier and / or the first identifier with the first LCS session, the association between the first LCS session and the second LCS session can be achieved.

[0077] In combination with some embodiments of the first aspect, in some embodiments, after the first network element associates the first LCS session identifier and / or the first identifier with the first LCS session, the method further includes:

[0078] The first network element sends a first message to the second network element; wherein the first message includes: a user plane connection establishment command message, the first identifier and at least one of the first LCS session identifier.

[0079] In the above embodiment, the first network element may notify the second network element that the first network element is about to establish a user plane connection with the UE and conduct a first LCS session on the user plane by sending the first message to the second network element.

[0080] In combination with some embodiments of the first aspect, in some embodiments, the first message instructs the second network element to map the first identifier to a second identifier; and sends a second message to the UE;

[0081] The second message includes: at least one of the user plane connection establishment command message, the second identifier and the first LCS session identifier.

[0082] In the above embodiment, the first network element can instruct the UE to establish a user plane connection with the first network element and conduct a first LCS session on the user plane by instructing the second network element to forward the user plane connection establishment command message to the UE.

[0083] In conjunction with some embodiments of the first aspect, in some embodiments, after the first network element sends the first message to the second network element, the method further includes:

[0084] The first network element establishes a user plane connection with the UE.

[0085] In the above embodiment, after forwarding the user plane connection establishment command message to the UE, the first network element may establish a user plane connection with the UE, paving the way for a subsequent first LCS session on the user plane.

[0086] In conjunction with some embodiments of the first aspect, in some embodiments, after the first network element establishes a user plane connection with the UE, the method further includes:

[0087] The first network element receives a third message sent by the second network element;

[0088] The third message includes at least one of a user plane connection establishment completion message and the first identifier.

[0089] In the above embodiment, the first network element receives the user plane connection completion message from the second network element, and can determine that the UE has established a complete user plane connection with the first network element.

[0090] In combination with some embodiments of the first aspect, in some embodiments, the user plane connection establishment completion message includes the first LCS session identifier.

[0091] In the above embodiment, by carrying the first LCS session identifier in the user plane connection completion message, it can be indicated that the currently established user plane is used to transmit the first LCS session.

[0092] In conjunction with some embodiments of the first aspect, in some embodiments, after the first network element receives the third message sent by the second network element, the method further includes:

[0093] The first network element sends a fourth message to the second network element;

[0094] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0095] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0096] In the above embodiment, the first network element may notify the second network element that the first network element has established a user plane connection with the UE by sending a fourth message carrying a user plane connection establishment indication to the second network element.

[0097] In conjunction with some embodiments of the first aspect, in some embodiments, after the first network element receives the third message sent by the second network element, the method further includes:

[0098] The first network element sends a fifth message to the UE on the user side;

[0099] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0100] In the above embodiment, the first network element sends the fifth message carrying the first LCS session identifier to the UE on the user side. In this way, the UE can determine the first LCS session to which the fifth message belongs based on the first LCS session identifier in the received fifth message.

[0101] In conjunction with some embodiments of the first aspect, in some embodiments, after the first network element receives the third message sent by the second network element, the method further includes:

[0102] Receiving, by the first network element, on the user plane, a sixth message sent by the UE;

[0103] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0104] In the above embodiment, the first network element receives the sixth message carrying the first LCS session identifier sent by the UE on the user plane. In this way, the first network element can determine the first LCS session to which the sixth message belongs based on the first LCS session identifier in the received sixth message.

[0105] In a second aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0106] The terminal UE receives a second message sent by the second network element;

[0107] The second message includes: at least one of a user plane connection establishment command message, a second identifier, and a first LCS session identifier;

[0108] The first LCS session identifier is used to identify the first LCS session, and the messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE and the first network element on the control plane; the second identifier is used to identify the second LCS session between the first network element and the UE on the control plane.

[0109] In conjunction with some embodiments of the second aspect, in some embodiments, the first LCS session identifier includes the first identifier or the second LCS session identifier;

[0110] The first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier allocated by the first network element to the first LCS session.

[0111] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0112] During the message transmission process of the second LCS session, the UE receives the second identifier sent by the second network element.

[0113] In conjunction with some embodiments of the second aspect, in some embodiments, after the UE receives the second message sent by the second network element, the method further includes:

[0114] The UE determines that the second identifier is associated with the second LCS session, and the UE associates the first LCS session identifier and / or the second identifier with the first LCS session.

[0115] In combination with some embodiments of the second aspect, in some embodiments, after the UE associates the first LCS session identifier and / or the second identifier with the first LCS session, the method further includes:

[0116] The UE establishes a user plane connection with the first network element.

[0117] In conjunction with some embodiments of the second aspect, in some embodiments, after the UE establishes a user plane connection with the first network element, the method further includes:

[0118] The UE sends a seventh message to the second network element;

[0119] The seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0120] In combination with some embodiments of the second aspect, in some embodiments, the user plane connection establishment completion message includes the first LCS session identifier.

[0121] In combination with some embodiments of the second aspect, in some embodiments, the seventh message instructs the second network element to map the second identifier to the first identifier and send a third message to the first network element;

[0122] The third message includes at least one of the user plane connection establishment completion message and the first identifier.

[0123] In conjunction with some embodiments of the second aspect, in some embodiments, after the UE sends the seventh message to the second network element, the method further includes:

[0124] The UE receives, on the user plane, a fifth message sent by the first network element;

[0125] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0126] In conjunction with some embodiments of the second aspect, in some embodiments, after the UE sends the seventh message to the second network element, the method further includes:

[0127] The UE sends a sixth message to the first network element on the user side;

[0128] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0129] In a third aspect, an embodiment of the present disclosure provides a communication method, the method comprising:

[0130] The second network element receives the first message sent by the first network element;

[0131] The first message includes: at least one of a user plane connection establishment command message, a first identifier, and a first LCS session identifier;

[0132] The first LCS session identifier is used to identify the first LCS session, and the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane; the first identifier is used to identify the second LCS session between the first network element and the UE on the control plane.

[0133] In conjunction with some embodiments of the third aspect, in some embodiments,

[0134] The first LCS session identifier includes the first identifier or the second LCS session identifier;

[0135] The first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier allocated by the first network element to the first LCS session.

[0136] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0137] During the message transmission process of the second LCS session, the second network element receives the first identifier sent by the first network element; or the second network element sends the first identifier to the first network element.

[0138] In conjunction with some embodiments of the third aspect, in some embodiments, after the second network element receives the first message sent by the first network element, the method further includes:

[0139] The second network element maps the first identifier to a second identifier; and sends a second message to the UE;

[0140] The second message includes: the user plane connection establishment command message, the second identifier and at least one of the first LCS session identifier; the second identifier is used to identify the second LCS session.

[0141] In conjunction with some embodiments of the third aspect, in some embodiments, after the second network element sends the second message to the UE, the method further includes:

[0142] The second network element receives a seventh message sent by the UE;

[0143] The seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0144] In combination with some embodiments of the third aspect, in some embodiments, the user plane establishment completion message includes the first LCS session identifier.

[0145] In combination with some embodiments of the third aspect, in some embodiments, after the second network element receives the seventh message sent by the UE, the method further includes:

[0146] The second network element maps the second identifier to the first identifier, and sends a third message to the first network element;

[0147] The third message includes at least one of the user plane connection establishment completion message and the first identifier.

[0148] In conjunction with some embodiments of the third aspect, in some embodiments, after the second network element sends the third message to the first network element, the method further includes:

[0149] The second network element receives a fourth message sent by the first network element;

[0150] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0151] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0152] In a fourth aspect, an embodiment of the present disclosure further provides a communication method, the method comprising:

[0153] The network device decides to use the user plane to conduct a first LCS session with the terminal UE, and determines the first LCS session identifier;

[0154] The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane.

[0155] In conjunction with some embodiments of the fourth aspect, in some embodiments,

[0156] The first LCS session identifier includes the first identifier or the second LCS session identifier;

[0157] The first identifier is used to identify a second LCS session conducted between the network device and the UE on the control plane; the second LCS session identifier includes an LCS session identifier allocated by the network device to the first LCS session.

[0158] In conjunction with some embodiments of the fourth aspect, in some embodiments, the method further includes:

[0159] During the message transmission process of the second LCS session, a first identifier and a second identifier are determined.

[0160] In conjunction with some embodiments of the fourth aspect, in some embodiments, after the network device determines the first LCS session identifier, the method further includes:

[0161] The network device associates the first LCS session identifier and / or the first identifier with the first LCS session.

[0162] In combination with some embodiments of the fourth aspect, in some embodiments, after the network device associates the first LCS session identifier and / or the first identifier with the first LCS session, the method further includes:

[0163] The network device sends a second message to the UE; wherein the second message includes: a user plane connection establishment command message, the second identifier and at least one of the first LCS session identifier.

[0164] In conjunction with some embodiments of the fourth aspect, in some embodiments, after the network device sends the second message to the UE, the method further includes:

[0165] The network device establishes a user plane connection with the UE.

[0166] In conjunction with some embodiments of the fourth aspect, in some embodiments, after the network device establishes a user plane connection with the UE, the method further includes:

[0167] The network device receives a seventh message sent by the UE;

[0168] The seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0169] In combination with some embodiments of the fourth aspect, in some embodiments, the user plane connection establishment completion message includes the first LCS session identifier.

[0170] In conjunction with some embodiments of the fourth aspect, in some embodiments, after the network device receives the seventh message sent by the UE, the method further includes:

[0171] The network device sends a fifth message to the UE on the user side;

[0172] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0173] In conjunction with some embodiments of the fourth aspect, in some embodiments, after the network device receives the seventh message sent by the UE, the method further includes:

[0174] Receiving, by the network device, on the user plane, a sixth message sent by the UE;

[0175] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0176] In a fifth aspect, an embodiment of the present disclosure further provides a first network element, which includes at least one of the first processing modules; wherein the first network element is used to execute an optional implementation method of the first aspect.

[0177] In a sixth aspect, an embodiment of the present disclosure further provides a terminal, comprising: a first receiving module; wherein the above-mentioned terminal is used to execute the optional implementation method of the second aspect.

[0178] In the seventh aspect, an embodiment of the present disclosure further provides a second network element, including: a second receiving module; wherein the above-mentioned second network element is used to execute the optional implementation method of the third aspect.

[0179] In an eighth aspect, an embodiment of the present disclosure further provides a network device, comprising: a fourth processing module; wherein the above-mentioned network device is used to execute the optional implementation method of the fourth aspect.

[0180] In a ninth aspect, an embodiment of the present disclosure further provides a first network element, including:

[0181] one or more processors;

[0182] The first network element is used to execute an optional implementation method of the first aspect.

[0183] In a tenth aspect, an embodiment of the present disclosure further provides a terminal, including:

[0184] one or more processors;

[0185] The terminal is used to execute the optional implementation of the second aspect.

[0186] In an eleventh aspect, an embodiment of the present disclosure further provides a second network element, including:

[0187] one or more processors;

[0188] The second network element is used to execute an optional implementation of the third aspect.

[0189] In a twelfth aspect, an embodiment of the present disclosure further provides a network device, including:

[0190] one or more processors;

[0191] Among them, the second network element of the network device is used to execute the optional implementation method of the fourth aspect.

[0192] In the thirteenth aspect, an embodiment of the present disclosure also provides a communication system, including a terminal, a first network element and a second network element; wherein, the first network element is configured as the optional implementation method as described in the first aspect, the terminal is configured to execute the optional implementation method as described in the second aspect, and the second network element is configured as the optional implementation method as described in the third aspect.

[0193] In the fourteenth aspect, an embodiment of the present disclosure further provides a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute an optional implementation method as described in the first aspect, the second aspect, the third aspect or the fourth aspect.

[0194] In a fifteenth 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, the third aspect or the fourth aspect.

[0195] In a sixteenth 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, third or fourth aspects.

[0196] In a seventeenth aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first aspect, the second aspect, the third aspect, or the fourth aspect.

[0197] It is understandable that the above-mentioned terminal, first network element, second network element, network device, communication system, storage medium, program product, computer program, chip or 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.

[0198] The embodiments of the present disclosure provide a communication method, a terminal, a first network element, a second network element, a network device, and a communication system. 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0203] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] In some embodiments, terms such as "greater than", "greater 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.

[0210] 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", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0211] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0212] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0213] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)", "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.

[0214] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0215] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0216] 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.

[0217] FIG1 is an exemplary schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1 , a communication system 100 includes a network device 104 and a terminal 101 , wherein the network device 104 may include a first network element 102 and a second network element 103 .

[0218] In some embodiments, the terminal includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, 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 at least one of a wireless terminal device in a smart home, but is not limited thereto. It is understandable 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. A person skilled in the art will know that with the evolution of the system architecture,

[0219] With the emergence of new business scenarios, the technical solutions proposed in the embodiments of the present disclosure are also applicable to similar technical problems. The following embodiments of the present disclosure can be applied to the communication system 100 shown in Figure 1, or part of the subject, but are not limited thereto. The subjects shown in Figure 1 are examples. The communication system may include all or part of the subjects in Figure 1, or may include other subjects outside Figure 1. The number and form of each subject are arbitrary. The connection relationship between the subjects is an example. The subjects may be connected or disconnected. The connection may be in any manner, which may be a direct connection or an indirect connection, and may be a wired connection or a wireless connection.

[0220] 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), 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 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, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0221] In some embodiments, the first network element may be a location management function (LMF) network element.

[0222] In some embodiments, the second network element may be an Access and Mobility Management Function (AMF) network element.

[0223] In some embodiments, the LMF network element or the terminal may trigger the establishment of a user plane connection. The terminal and the LMF network element may maintain the established user plane connection. The LMF network element may modify or terminate the user plane connection established between the terminal and the LMF network element.

[0224] In some embodiments, the LMF network element can send its user plane information, such as an IP address or a fully qualified domain name (FQDN), to the terminal via the DL NAS TRANSPORT message of the AMF network element. If the LMF network element sends its FQDN to the terminal, a DNS server / resolver is used to resolve the IP address of the LMF network element (e.g., EASDF or local DNS for local LMF network element address resolution). The terminal uses a terminal route selection policy (UE Route Selection Policy, URSP) including user plane positioning related PDU session parameters, such as a dedicated data network name (DNN) and network slice selection assistance information (S-NSSAI) to establish a PDU session for user plane positioning. The Session Management Function (SMF) shall select the PDU Session Anchor-User Plane Function (PSA-UPF) network element connected to the LMF network element for the PDU session based on the S-NSSAI, DNN and terminal location information. The PDU Session Anchor-User Plane Function (PSA-UPF) network element shall be located at the central site or the local site.

[0225] In some embodiments, session interruption for local LMF services for user plane positioning can be supported by using the IP address / network prefix of the local LMF and its DNAI to pre-configure the Session Management Function (SMF), which is used to locate the dedicated PDU session in a specific service area where the local PDU Session Anchor (PSA) and UL CL / BP are inserted.

[0226] In some embodiments, if the target terminal does not have a user plane connection with the LMF network element, the LMF network element may trigger the establishment of a user plane connection after receiving a location request from the AMF network element. If the terminal supports user plane positioning, the AMF network element also subscribes to the status of the LCS user plane connection of the target terminal from the LMF network element using the Nlmf_Location_UP Subscribe message.

[0227] It can be 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. Ordinary technicians in this field can know that with the evolution of the 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.

[0228] FIG2 is an interactive diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG2 , the method includes:

[0229] Step 201: The LMF network element 102 and the UE 101 conduct a second LCS (LoCation Service) session on the control plane.

[0230] In the field of wireless communications, the radio interface protocol stack can be divided into two planes: the control plane and the user plane. The user plane is responsible for user data processing, while the control plane is responsible for control and management such as connection establishment, mobility management, and security.

[0231] During the process of LCS session between UE101 and LMF network element 102 on the control plane, the LCS session is established between LMF and UE101, and between UE101 and AMF network element 103, Routing ID (routing identifier, i.e., second identifier) ​​or Routing information (routing information) is used to identify the LCS session, that is, Routing ID or Routing information is used as the LCS session identifier between UE101 and AMF network element 103 on the control plane; and, between AMF network element 103 and LMF network element 102, Correlation ID (correlation identifier, i.e., first identifier) ​​is used to identify the LCS session and LMF network element 102, that is, Correlation ID is used as the LCS session identifier between AMF network element 103 and LMF network element 102 on the control plane, and Correlation ID is used as the network element identifier of LMF network element 102. For example, when the AMF network element 103 receives the message and Routing ID sent by UE101, the AMF network element 103 can map the Routing ID to the Correlation ID and send the message to the LMF network element 102 identified by the Correlation ID. The Routing ID (or Routing information) and the Correlation ID can not only identify the LMF network element 102, but also identify the LCS session between the LMF network element 102 and the UE101.

[0232] Optionally, for a Routing ID and a Correlation ID that have a mapping relationship, the value of the Routing ID may be the same as or different from the value of the Correlation ID. When the value of the Routing ID is the same as the value of the Correlation ID, there must be a mapping relationship between the Routing ID and the Correlation ID. When the value of the Routing ID is different from the value of the Correlation ID, the corresponding value of the Correlation ID can be determined based on the value of the Routing ID and the mapping relationship, and then the corresponding LMF and the LCS session to which the current message belongs can be determined; or, the corresponding value of the Routing ID can be determined based on the value of the Correlation ID and the mapping relationship, and then the LCS session to which the current message belongs can be determined.

[0233] During the LCS session between UE 101 and LMF network element 102 in the user plane, it is necessary to add an LCS session identifier in the uplink / downlink positioning service user plane transmission message to identify the LCS session between LMF and UE 101. However, when UE 101 transmits the same LCS session using the control plane and user plane at the same time (for example, when switching from the control plane to the user plane due to congestion of the AMF network element 103, switching from the user plane to the control plane due to unstable connection, when UE 101 uses the control plane and user plane for the same LCS session, etc.), UE 101 and LMF need to recognize that the LCS session identifier in the user plane and the Correlation ID and Routing ID in the control plane are all used for the same LCS session.

[0234] Optionally, during the process of conducting a second LCS session between UE101 and LMF102 network element on the control plane (i.e., during the message transmission process of the second LCS session), UE101 and LMF network element 102 may transmit messages through AMF network element 103. During the process of conducting a second LCS session between UE101 and LMF network element 102 on the control plane, operations related to LCS (positioning service) may be performed, including but not limited to event report operations, periodic triggered invoke operations, and MS (mobile station) cancelling delayed location operations.

[0235] Optionally, the Routing ID (routing identifier, i.e., the first identifier) ​​or Routing information (routing information) may be used as the LCS session identifier of the second LCS session between the UE and the AMF network element; and the Correlation ID (correlation identifier, i.e., the second identifier) ​​may be used as the LCS session identifier of the second LCS session between the AMF network element and the LMF network element. The Routing ID and the Correlation ID may be allocated by the LMF network element or the AMF network element.

[0236] Specifically, the allocation entity of the Routing ID and the Correlation ID is associated with the initiator of the second LCS session.

[0237] (1) If the second LCS session is initiated by the UE, the Routing ID and Correlation ID allocation process includes the following two parts:

[0238] (1) ① The UE sends an UL NAS TRANSPORT message to the AMF network element (wherein the container in the UL NAS TRANSPORT message carries a specific LCS session-related message (e.g., an LCS message or an LPP message (LTE Positioning Protocol, LTE Positioning Protocol; where LTE stands for Long Term Evolution)); ② After receiving the UL NAS TRANSPORT message, the AMF network element determines the specific message content carried in the container in the UL NAS TRANSPORT message; and allocates a Correlation ID, using the Correlation ID as the LCS session identifier for the second LCS session between the AMF network element and the LMF network element; ③ The AMF network element sends the content and the Correlation ID carried in the container of the UL NAS TRANSPORT message to the LMF network element; ④ After receiving the message sent by the AMF, the LMF network element saves the Correlation ID in the message and uses the Correlation ID as the identifier of the second LCS session on the control plane. In the subsequent message transmission process for the second LCS session, the Correlation ID is carried, and the Correlation ID is used as the identifier of the second LCS session based on the Correlation ID. The ID identifies whether the received message is associated with the second LCS session.

[0239] Among them, the AMF network element can carry the content carried in the container of the UL NAS TRANSPORT message and the Correlation ID in the Namf_Communication_N1MessageNotify message (N1 reference point notification message) or the Nlmf_Location_Determination message (positioning determination message), and then send the Namf_Communication_N1MessageNotify message or the Nlmf_Location_Determination message to the LMF network element.

[0240] (2)①The LMF network element sends a Namf_Communication_N1N2MessageTransfer message (N1N2 reference point transmission message) to the AMF network element. The Namf_Communication_N1N2MessageTransfer carries the specific message content and Correlation ID.②After receiving the Namf_Communication_N1N2MessageTransfer message, the AMF network element maps the Correlation ID in the Namf_Communication_N1N2MessageTransfer to a Routing ID, and uses the Routing ID as the LCS session identifier of the second LCS session between the AMF network element and the UE.③The AMF network element carries the Routing ID and the specific message content in the Namf_Communication_N1N2MessageTransfer in a DL NAS TRANSPORT message, and forwards the DL NAS TRANSPORT message to the UE.④After receiving the DL NAS TRANSPORT message, the UE saves the Routing ID in the DL NAS TRANSPORT message and uses the Routing ID as the identifier of the second LCS session on the control plane. During the subsequent message transmission process of the second LCS session, the Routing ID is carried, and whether the received message is associated with the second LCS session is identified based on the Routing ID.

[0241] (2) If the second LCS session is initiated through the LMF network element, the process of allocating the Routing ID and Correlation ID includes the following two parts:

[0242] (1)①The LMF network element allocates a Correlation ID, uses the Correlation ID as the LCS session identifier of the second LCS session between the AMF network element and the LMF network element, and sends a Namf_Communication_N1N2MessageTransfer message to the AMF network element. The Namf_Communication_N1N2MessageTransfer message carries the Correlation ID and specific message content.②After receiving the Namf_Communication_N1N2MessageTransfer message, the AMF network element maps the Correlation ID in the Namf_Communication_N1N2MessageTransfer message to a Routing ID, and uses the Routing ID as the LCS session identifier of the second LCS session between the AMF network element and the UE.③The AMF network element carries the message content and Routing ID carried in the Namf_Communication_N1N2MessageTransfer message in a DL NAS TRANSPORT message and forwards the DL NAS TRANSPORT message to the UE. The UE saves the Routing ID in the DL NAS TRANSPORT message and uses the Routing ID in the Namf_Communication_N1N2MessageTransfer message as the LCS session identifier of the second LCS session between the AMF network element and the UE. The ID serves as the identifier of the second LCS session on the control plane. In the subsequent message transmission process of the LCS session, the Routing ID is carried, and the Routing ID is used to identify whether the received message is associated with the second LCS session.

[0243] (2)①The UE sends a UL NAS TRANSPORT message to the AMF network element. The UL NAS TRANSPORT message carries the Routing ID and specific message content.②The AMF network element maps the Routing ID in the UL NAS TRANSPORT message to the Correlation ID, uses the Correlation ID as the LCS session identifier of the second LCS session between the AMF network element and the LMF network element, and sends the content and Correlation ID carried in the container of the UL NAS TRANSPORT message to the LMF network element.③The LMF network element receives the Namf_Communication_N1MessageNotify message.

[0244] Among them, as mentioned above, the AMF network element can carry the content carried in the container of the UL NAS TRANSPORT message and the Correlation ID in the Namf_Communication_N1MessageNotify message (N1 reference point notification message) or the Nlmf_Location_Determination message (positioning determination message), and then send the Namf_Communication_N1MessageNotify message or the Nlmf_Location_Determination message to the LMF network element.

[0245] Step 202: The LMF network element 102 decides to use the user plane to conduct a first LCS session with the terminal 101, wherein the messages transmitted in the first LCS session include LCS session-related messages that have not been transmitted between the UE 101 and the LMF network element 102 on the control plane.

[0246] The LMF network element 102 may decide to use the user plane to conduct the first LCS session with the LMF network element 102 under any of the following conditions:

[0247] LMF network element 102 fails to send a message to UE 101;

[0248] or

[0249] The LMF network element 102 decides to use the user plane to conduct the first LCS session with the UE 101 according to the data size to be transmitted to the UE 101 .

[0250] Optionally, the failure of the LMF network element 102 to send a message to the UE 101 may include congestion of the AMF network element 103. Specifically, the congestion of the AMF network element 103 includes: a NAS (Non Access Stratum) message sent by the LMF network element 102 to the UE 101 via the AMF network element 103 is not accepted by the UE 101, and the AMF network element 103 indicates congestion to the LMF network element 102.

[0251] Optionally, the LMF network element 102 decides to use the user plane to conduct the first LCS session with UE101 based on the amount of data to be transmitted to UE101, which can specifically include: the LMF network element 102 decides to use the user plane to conduct the first LCS session with UE101 when determining that the amount of data to be transmitted to UE101 is greater than the preset data amount.

[0252] In some embodiments, after the LMF network element 102 decides to use the user plane to conduct the first LCS session with the terminal 101, it determines the first LCS session identifier; wherein, the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE 101 and the LMF network element 102 on the control plane; the first LCS session identifier is used to identify the first LCS session.

[0253] Optionally, after UE101 establishes a user plane connection with the LMF network element 102, the first LCS session is actually the same LCS session as the second LCS session, and the messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted in the second LCS session.

[0254] As an embodiment, assuming that the LCS session-related message transmitted in the second LCS session is a periodic event report (Event Report) message, the specific period is 5 periods. When UE101 decides to use the user plane to conduct the first LCS session with the LMF network element 102, the terminal 101 has transmitted 3 periods of event report messages with the LMF network element 102 on the control plane (i.e., in the second LCS session). After UE101 establishes a user plane connection with the LMF network element 102, the remaining 2 periods of event report messages are transmitted on the connected user plane.

[0255] As another embodiment, assuming that the second LCS session is a MO-LR (Mobile Originated Location Request, terminal-initiated positioning request) session, when UE101 decides to use the user plane to conduct the first LCS session with the LMF network element 102, the terminal UE101 has transmitted the LCS message of the MO-LR process with the LMF network element 102 on the control plane (i.e., in the second LCS session). After UE101 establishes a user plane connection with the LMF network element 102, it continues to transmit the LPP message of the MO-LR session on the connected user plane.

[0256] In some embodiments, the first LCS session identifier includes a first identifier or a second LCS session identifier;

[0257] Among them, the first identifier is used to identify the second LCS session conducted between the LMF network element 102 and the UE 101 on the control plane; the second LCS session identifier includes the LCS session identifier allocated by the LMF network element 102 to the first LCS session.

[0258] That is to say, the LMF network element 102 can allocate an LCS session identifier (i.e., a second LCS session identifier) ​​for the first LCS session, or use the Correlation ID as the LCS session identifier of the first LCS session.

[0259] In some embodiments, the LMF network element 102 associates the first LCS session identifier and / or the first identifier with the first LCS session.

[0260] Optionally, when the LMF network element 102 uses the Correlation ID as the first LCS session identifier, the LMF network element 102 may associate the Correlation ID with the first LCS session (or may associate the first LCS session identifier and the first identifier with the first LCS session).

[0261] When the LMF network element 102 allocates a second LCS session identifier to the first LCS session, the LMF network element 102 may associate the second LCS session identifier with the first LCS session (or may associate the first LCS session identifier and the first identifier with the first LCS session).

[0262] Step 203: The LMF network element 102 sends a first message to the AMF network element 103; wherein the first message includes: a user plane connection establishment command message, the first identifier and at least one of the first LCS session identifier.

[0263] Optionally, the first message may include Namf_Communication_N1N2MessageTransfer (N1N2 reference point transfer message).

[0264] Optionally, when the LMF network element 102 uses the Correlation ID as the first LCS session identifier, the first message includes: a user plane connection establishment command message and the Correlation ID (the first message may also be a user plane connection establishment command, a first LCS session identifier and a Correlation ID).

[0265] When the LMF network element 102 allocates a second LCS session identifier for the first LCS session, the first message includes: a user plane connection establishment command message, the first identifier and the second LCS session identifier (the sixth message can also be a user plane connection establishment command, a first LCS session identifier and a Correlation ID).

[0266] Optionally, the user plane connection command message may include the first LCS session identifier. Wherein, in the case where the user plane connection command message includes the first LCS session identifier, the first message may include a user plane connection establishment command message and a Correlation ID.

[0267] Step 204: The AMF network element 103 maps the first identifier to a second identifier according to a preset correspondence; and sends a second message to the UE 101; wherein the second message includes: the user plane connection establishment command message, the second identifier and at least one of the first LCS session identifier.

[0268] Optionally, the second identifier includes a Routing ID. The preset corresponding relationship is a mapping relationship between the Correlation ID and the Routing ID determined by an allocation entity of the Correlation ID and the Routing ID.

[0269] Optionally, the second message may include a DL NAS TRANSPORT (downlink non-access stratum transport message) message.

[0270] Optionally, after the AMF network element 103 determines that the first message includes a user plane connection establishment command message and a Correlation ID, and maps the Correlation ID to the Routing ID according to a preset correspondence, if the value of the Routing ID is the same as the value of the Correlation ID, the second message may include the user plane connection establishment command message and the first identifier, or the second message may include the user plane establishment command message and the first LCS session identifier.

[0271] In some embodiments, after the UE101 receives the second message sent by the AMF network element 103, it determines that the second identifier is associated with the second LCS session, and the UE101 associates the first LCS session identifier and / or the second identifier to the first LCS session.

[0272] Optionally, after mapping the Correlation ID to the Routing ID, the AMF network element 103 can directly determine the UE101 identified by the Routing ID as the target UE101 and send a second message to the target UE101.

[0273] Optionally, after receiving the second message sent by the AMF network element 103, UE101 can determine that the Routing ID in the second message is the Routing ID in the process of conducting the second LCS session when it is determined that the Routing ID in the second message is the same as the Routing ID locally stored in UE101, and then, based on the user plane connection establishment command message and the first LCS session identifier in the second message, it can be determined that a user plane connection is about to be established with the LMF network element 102, and the first LCS session is to be conducted on the established user plane, and the first LCS session identifier and Routing ID in the user plane connection command message are associated with the first LCS session.

[0274] Optionally, when the second message includes a user plane connection establishment command message and the second identifier, UE101 can associate the second identifier with the first LCS session after receiving the second message; when the second message includes a user plane connection establishment command message and the first LCS session identifier, UE101 can associate the first LCS session identifier with the first LCS session after receiving the second message; when the third message includes a user plane connection establishment command message, the first LCS session identifier and the second identifier, UE101 can associate the first LCS session identifier and the second identifier with the first LCS session after receiving the second message.

[0275] Step 205: The LMF network element 102 establishes a user plane connection with the UE 101.

[0276] Step 206: The UE 101 sends a seventh message to the AMF network element 103; wherein the seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0277] Optionally, the seventh message may include a UL NAS TRANSPORT (uplink non-access stratum transport message) message.

[0278] In some embodiments, the user plane connection establishment completion message includes the first LCS session identifier.

[0279] Step 207: The AMF network element 103 maps the second identifier to the first identifier according to a preset correspondence, and sends a third message to the LMF network element 102;

[0280] The third message includes at least one of the user plane connection establishment completion message and the first identifier.

[0281] Optionally, the third message includes a Namf_Communication_N1MessageNotify (N1 reference point notification message) message.

[0282] Optionally, the AMF network element 103 can map the Routing ID to the Correlation ID according to the above-mentioned method of mapping the Correlation ID to the Routing ID and the preset correspondence relationship, which is not repeated here.

[0283] In some embodiments, after the LMF network element 102 receives the third message sent by the AMF network element 103, the method further includes:

[0284] The LMF network element 102 sends a fourth message to the AMF network element 103;

[0285] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0286] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0287] Optionally, the fourth message may include an Nlmf_Location_UPNotify (user plane location notification message) message.

[0288] Step 208: The LMF network element 102 transmits messages with the UE 101 on the user plane.

[0289] Optionally, step 208 may include the following step 2081 and / or step 2082 .

[0290] Step 2081: The LMF network element 102 sends a fifth message to the UE 101 on the user side.

[0291] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0292] Optionally, the fifth message may include DL LCS-UP TRANSPORT.

[0293] Optionally, after receiving the fifth message, UE 101 may determine that the fifth message is associated with the first LCS session based on the first LCS session identifier carried in the fourth message, and further determine the message type of the fifth message based on the LCS message and / or LPP message carried in the fifth message.

[0294] Step 2082: The LMF network element 102 receives, on the user plane, a sixth message sent by the UE 101.

[0295] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0296] Optionally, the sixth message may include UL LCS-UP TRANSPORT.

[0297] Optionally, after receiving the sixth message, the LMF network element 102 may determine that the sixth message is associated with the first LCS session based on the first LCS session identifier carried in the sixth message, and further determine the message type of the sixth message based on the LCS message and / or LPP message carried in the sixth message.

[0298] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0299] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0300] In some embodiments, terms such as wireless access scheme and waveform may be used interchangeably.

[0301] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0302] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true (trUE101) or false (false), or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0303] In some embodiments, "not expecting to receive" can be interpreted as not receiving on time domain resources and / or frequency domain resources, or as not performing subsequent processing on the data after receiving it; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the recipient to respond to the content sent.

[0304] The communication method involved in the embodiments of the present disclosure may include at least one of the aforementioned steps and embodiments. For example, step 201 can be implemented as an independent embodiment, step 202 can be implemented as an independent embodiment, step 203 can be implemented as an independent embodiment, step 204 can be implemented as an independent embodiment, step 205 can be implemented as an independent embodiment, step 206 can be implemented as an independent embodiment, step 207 can be implemented as an independent embodiment, and step 208 can be implemented as an independent embodiment; the combination of step 201 and step 202 can be implemented as an independent embodiment, the combination of step 201, step 202, step 203 and step 204 can be implemented as an independent embodiment, and the combination of step 201, step 202, step 203, step 204 and step 205 can be implemented as an independent embodiment. The combination of step 201, step 202, step 203, step 204, step 205, step 206 and step 207 can be implemented as an independent embodiment, the combination of step 201, step 202, step 203, step 204, step 205, step 206, step 207 and step 208 can be implemented as an independent embodiment, the combination of step 201, step 202, step 203, step 204, step 205, step 206, step 207 and step 2081 can be implemented as an independent embodiment, the combination of step 201, step 202, step 203, step 204, step 205, step 206, step 207 and step 2082 can be implemented as an independent embodiment, but is not limited thereto.

[0305] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0306] FIG3 is a flowchart of a communication method according to an embodiment of the present disclosure.

[0307] As shown in FIG3 , the above method may be applied to the first network element 102, and the above method includes:

[0308] Step 301: The first network element 102 and the UE 101 conduct a second LCS session on the control plane.

[0309] Optionally, in an embodiment of the present disclosure, during the message transmission process of the second LCS session, the first network element 102 or the second network element 103 allocates a first identifier (ie, Correlation ID) and a second identifier (ie, Routing ID).

[0310] Specifically, the allocation entity of the Routing ID and the Correlation ID is associated with the initiator of the second LCS session. Please refer to the description of the optional implementation method of the steps for details, which will not be repeated here. Among them, when the first network element 102 allocates the first identifier, the first identifier is sent to the second network element 103, and after the second network element 103 receives the first identifier, the first identifier is mapped to the second identifier, and the second identifier is sent to UE101. When the second network element 103 allocates the first identifier, the first identifier is sent to the first network element 102, and after receiving the first identifier and the positioning message sent by the first network element 102, the first identifier is mapped to the second identifier, and the second identifier and the positioning message are sent to UE101.

[0311] In step 302, the first network element 102 decides to use the user plane to conduct a first LCS session with the terminal 101, and the first network element 102 determines a first LCS session identifier; wherein, the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE 101 and the first network element 102 on the control plane; the first LCS session identifier is used to identify the first LCS session.

[0312] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes a first identifier or a second LCS session identifier;

[0313] The first identifier is used to identify the second LCS session conducted between the first network element 102 and the UE 101 on the control plane; the second LCS session identifier includes the LCS session identifier allocated by the first network element 102 to the first LCS session.

[0314] Optionally, in the embodiment of the present disclosure, the first network element 102 associates the first LCS session identifier and / or the first identifier with the first LCS session.

[0315] Step 303: The first network element 102 sends a first message to the second network element 103; wherein the first message includes: a user plane connection establishment command message, the first identifier and at least one of the first LCS session identifier.

[0316] Optionally, the first message may include a Namf_Communication_N1N2MessageTransfer message.

[0317] Optionally, in the embodiment of the present disclosure, the first message instructs the second network element 103 to map the first identifier to a second identifier; and send a second message to the UE 101;

[0318] The second message includes: at least one of the user plane connection establishment command message, the second identifier and the first LCS session identifier.

[0319] Step 304: The first network element 102 establishes a user plane connection with the UE 101.

[0320] Step 305: The first network element 102 receives a third message sent by the second network element 103; wherein the third message includes at least one of a user plane connection establishment completion message and the first identifier.

[0321] Optionally, the third message includes a Namf_Communication_N1MessageNotify (N1 reference point notification message) message.

[0322] Optionally, in an embodiment of the present disclosure, the user plane connection establishment completion message includes the first LCS session identifier.

[0323] Optionally, in the embodiment of the present disclosure, the first network element 102 sends a fourth message to the second network element 103;

[0324] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0325] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0326] Optionally, the fourth message may include an Nlmf_Location_UPNotify (user plane location notification message) message.

[0327] Step 306 : The first network element 102 transmits a message to the UE 101 on the user plane.

[0328] Optionally, step 304 may include the following steps 3061 and / or 3062 .

[0329] Step 3061: The first network element 102 sends a fifth message to the UE 101 on the user side.

[0330] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0331] Optionally, the fifth message may include DL LCS-UP TRANSPORT.

[0332] Step 3062: The LMF network element 102 receives, on the user plane, a sixth message sent by the UE 101.

[0333] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0334] Optionally, the sixth message may include UL LCS-UP TRANSPORT.

[0335] Optionally, after receiving the sixth message, the LMF network element 102 may determine that the sixth message is associated with the first LCS session based on the first LCS session identifier carried in the sixth message, and further determine the message type of the sixth message based on the LCS message and / or LPP message carried in the sixth message.

[0336] The communication method involved in the embodiments of the present disclosure may include at least one of the aforementioned steps and embodiments. For example, step 301 can be implemented as an independent embodiment, step 302 can be implemented as an independent embodiment, step 303 can be implemented as an independent embodiment, step 304 can be implemented as an independent embodiment, step 305 can be implemented as an independent embodiment, step 306 can be implemented as an independent embodiment, step 3061 can be implemented as an independent embodiment, and step 3062 can be implemented as an independent embodiment; the combination of step 301 and step 302 can be implemented as an independent embodiment, and the combination of step 301, step 302, step 303 and step 304 can be implemented as an independent embodiment. For example, the combination of step 301, step 302, step 303, step 304 and step 305 can be implemented as an independent embodiment, the combination of step 301, step 302, step 303, step 304, step 305 and step 306 can be implemented as an independent embodiment, the combination of step 301, step 302, step 303, step 304, step 305 and step 3061 can be implemented as an independent embodiment, the combination of step 301, step 302, step 303, step 304, step 305 and step 3062 can be implemented as an independent embodiment, but is not limited to this.

[0337] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3 .

[0338] FIG4 is a second flowchart of a communication method according to an embodiment of the present disclosure.

[0339] As shown in FIG4 , the above method may be applied to UE 101, and the above method includes:

[0340] In step 401 , the first network element 102 and the UE 101 conduct a second LCS session on the control plane.

[0341] In step 402, UE101 receives a second message sent by the second network element 103; wherein, the second message includes: a user plane connection establishment command message, a second identifier and at least one of the first LCS session identifier; the message transmitted in the first LCS session includes the LCS session-related message that has not been completed between the UE101 and the first network element 102 on the control plane; the second identifier is used to identify the second LCS session conducted between the first network element 102 and the UE101 on the control plane; the first LCS session identifier is used to identify the first LCS session.

[0342] Optionally, UE101 decides to use the user plane to conduct a first LCS session with terminal 101 based on the first network element 102, and receives a second message sent by the second network element 103.

[0343] Optionally, the second message may include a DL NAS TRANSPORT (downlink non-access stratum transport message) message.

[0344] Optionally, in an embodiment of the present disclosure, during the message transmission process of the second LCS session, the first network element 102 or the second network element 103 allocates a first identifier (ie, Correlation ID) and a second identifier (ie, Routing ID).

[0345] Specifically, the allocation entity of the Routing ID and the Correlation ID is associated with the initiator of the second LCS session. Please refer to the description of the optional implementation method of the steps for details, which will not be repeated here. Among them, when the first network element 102 allocates the first identifier, the first identifier is sent to the second network element 103, and after the second network element 103 receives the first identifier, the first identifier is mapped to the second identifier, and the second identifier is sent to UE101. When the second network element 103 allocates the first identifier, the first identifier is sent to the first network element 102, and after receiving the first identifier and the positioning message sent by the first network element 102, the first identifier is mapped to the second identifier, and the second identifier and the positioning message are sent to UE101.

[0346] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes the first identifier or the second LCS session identifier;

[0347] The first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier allocated by the first network element 102 to the first LCS session.

[0348] In step 403 , UE 101 determines that the second identifier is associated with the second LCS session, and associates the first LCS session identifier and / or the second identifier with the first LCS session.

[0349] Step 404 : UE 101 establishes a user plane connection with the first network element 102 .

[0350] Step 405: The UE 101 sends a seventh message to the second network element 103; wherein the seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0351] Optionally, the seventh message may include a UL NAS TRANSPORT (uplink non-access stratum transport message) message.

[0352] Optionally, in an embodiment of the present disclosure, the user plane connection establishment completion message includes the first LCS session identifier.

[0353] Optionally, in the embodiment of the present disclosure, the seventh message instructs the second network element 103 to map the second identifier to the first identifier and send a third message to the first network element 102;

[0354] The third message includes at least one of the user plane connection establishment completion message and the first identifier.

[0355] Step 406 : UE 101 transmits a message to the first network element 102 on the user plane.

[0356] Optionally, step 405 may include the following steps 4051 and / or 4052 .

[0357] Step 4061: The UE 101 sends a fifth message to the first network element 102 in the user direction;

[0358] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0359] Optionally, the fifth message may include DL LCS-UP TRANSPORT.

[0360] Step 4062: UE 101 sends a sixth message to the first network element 102 on the user side;

[0361] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0362] Optionally, the sixth message may include UL LCS-UP TRANSPORT.

[0363] The communication method involved in the embodiments of the present disclosure may include at least one of the aforementioned steps and embodiments. For example, step 401 can be implemented as an independent embodiment, step 402 can be implemented as an independent embodiment, step 403 can be implemented as an independent embodiment, step 404 can be implemented as an independent embodiment, step 405 can be implemented as an independent embodiment, step 406 can be implemented as an independent embodiment, step 4061 can be implemented as an independent embodiment, and step 4062 can be implemented as an independent embodiment; the combination of step 401 and step 402 can be implemented as an independent embodiment, the combination of step 401, step 402 and step 403 can be implemented as an independent embodiment, and step 401, step 402, step 403 and step 404 can be implemented as an independent embodiment. The combination of step 404 can be implemented as an independent embodiment, the combination of step 401, step 402, step 403, step 404 and step 405 can be implemented as an independent embodiment, the combination of step 401, step 402, step 403, step 404, step 405 and step 406 can be implemented as an independent embodiment, the combination of step 401, step 402, step 403, step 404, step 405 and step 4061 can be implemented as an independent embodiment, and the combination of step 401, step 402, step 403, step 404, step 405 and step 4062 can be implemented as an independent embodiment, but is not limited to this.

[0364] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 4 .

[0365] FIG5 is a third flowchart of a communication method according to an embodiment of the present disclosure.

[0366] As shown in FIG5 , the above method may be applied to the second network element 103, and the above method includes:

[0367] Step 501: The second network element 103 receives a first message sent by the first network element 102.

[0368] The first message includes: at least one of a user plane connection establishment command message, a first identifier, and a first LCS session identifier;

[0369] The messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE101 and the first network element 102 on the control plane; the first LCS session identifier is used to identify the first LCS session; the first identifier is used to identify the second LCS session conducted between the first network element 102 and the UE101 on the control plane.

[0370] Optionally, the second network element 103 decides to use the user plane to conduct a first LCS session with the terminal 101 based on the first network element 102 , and receives a first message sent by the first network element 102 .

[0371] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes the first identifier or the second LCS session identifier;

[0372] The first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier allocated by the first network element 102 to the first LCS session.

[0373] Optionally, before the first network element 102 decides to use the user plane to conduct the first LCS session with the UE 101, the UE 101 and the first network element 102 conduct the second LCS session on the control plane; and during the message transmission process of the second LCS session,

[0374] The second network element 103 receives the first identifier sent by the first network element 102; or, the second network element 103 sends the first identifier to the first network element 102.

[0375] Optionally, in an embodiment of the present disclosure, during the message transmission process of the second LCS session, the first network element 102 or the second network element 103 allocates a first identifier (ie, Correlation ID) and a second identifier (ie, Routing ID).

[0376] Specifically, the allocation entity of the Routing ID and the Correlation ID is associated with the initiator of the second LCS session. Please refer to the description of the optional implementation method of the steps for details, which will not be repeated here. Among them, when the first network element 102 allocates the first identifier, the first identifier is sent to the second network element 103, and after the second network element 103 receives the first identifier, the first identifier is mapped to the second identifier, and the second identifier is sent to UE101. When the second network element 103 allocates the first identifier, the first identifier is sent to the first network element 102, and after receiving the first identifier and the positioning message sent by the first network element 102, the first identifier is mapped to the second identifier, and the second identifier and the positioning message are sent to UE101.

[0377] Step 502: The second network element 103 maps the first identifier to a second identifier; and sends a second message to the UE 101;

[0378] The second message includes: the user plane connection establishment command message, the second identifier and at least one of the first LCS session identifier; the second identifier is used to identify the second LCS session.

[0379] Step 503: The second network element 103 receives the seventh message sent by the UE 101;

[0380] The seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0381] Optionally, in an embodiment of the present disclosure, the user plane establishment completion message includes the first LCS session identifier.

[0382] Step 504: The second network element 103 maps the second identifier to the first identifier and sends a third message to the first network element 102;

[0383] The third message includes at least one of the user plane connection establishment completion message and the first identifier.

[0384] Optionally, in the embodiment of the present disclosure, after sending the third message to the first network element 102, the method further includes:

[0385] The second network element 103 receives the fourth message sent by the first network element 102;

[0386] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0387] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0388] The communication method involved in the embodiments of the present disclosure may include at least one of the aforementioned steps and embodiments. For example, step 501 can be implemented as an independent embodiment, step 502 can be implemented as an independent embodiment, step 503 can be implemented as an independent embodiment, and step 504 can be implemented as an independent embodiment; the combination of step 501 and step 502 can be implemented as an independent embodiment, the combination of step 503 and step 504 can be implemented as an independent embodiment, and the combination of step 501, step 502, step 503, and step 504 can be implemented as an independent embodiment, but is not limited thereto.

[0389] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 5 .

[0390] FIG6 is a fourth flowchart of a communication method according to an embodiment of the present disclosure.

[0391] As shown in FIG6 , the above method may be applied to a network device 104. Optionally, the network device 104 includes a first network element 102 and a second network element 103. As shown in FIG6 , the above method includes:

[0392] In step 601 , the network device 104 and the UE 101 conduct a second LCS session on the control plane.

[0393] Optionally, in an embodiment of the present disclosure, during the message transmission process of the second LCS session, a first identifier (i.e., Correlation ID) and a second identifier (i.e., Routing ID) can be allocated by the first network element 102 or the second network element 103 in the network device 104.

[0394] Specifically, the allocation entity of the Routing ID and the Correlation ID is associated with the initiator of the second LCS session. Please refer to the description of the optional implementation method of the steps for details, which will not be repeated here. Among them, when the first network element 102 allocates the first identifier, the first identifier is sent to the second network element 103, and after the second network element 103 receives the first identifier, the first identifier is mapped to the second identifier, and the second identifier is sent to UE101. When the second network element 103 allocates the first identifier, the first identifier is sent to the first network element 102, and after receiving the first identifier and the positioning message sent by the first network element 102, the first identifier is mapped to the second identifier, and the second identifier and the positioning message are sent to UE101.

[0395] Step 602: The network device 104 decides to use the user plane to conduct a first LCS session with the terminal UE 101, and determines a first LCS session identifier.

[0396] Among them, the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE 101 and the first network element 102 on the control plane; the first LCS session identifier is used to identify the first LCS session.

[0397] Optionally, the first network element 102 in the network device 104 may decide to use the user plane to conduct the first LCS session with the terminal UE 101 , and determine the first LCS session identifier.

[0398] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes a first identifier or a second LCS session identifier;

[0399] The first identifier is used to identify the second LCS session conducted between the network device 104 and the UE 101 on the control plane; the second LCS session identifier includes the LCS session identifier allocated by the network device 104 to the first LCS session.

[0400] In step 603 , the network device 104 associates the first LCS session identifier and / or the first identifier with the first LCS session.

[0401] Optionally, the first LCS session identifier and / or the first identifier may be associated with the first LCS session through the first network element 102 in the network device 104 .

[0402] Step 604: The network device 104 sends a second message to the UE 101; wherein the second message includes: a user plane connection establishment command message, the second identifier, and at least one of the first LCS session identifier.

[0403] Optionally, a first message may be sent by the first network element 102 in the network device 104 to the second network element 103; wherein the first message includes: a user plane connection establishment command message, at least one of the first identifier and the first LCS session identifier. The second network element 103 in the network device 104 maps the first identifier to a second identifier according to a preset correspondence relationship, and sends a second message to the UE 101.

[0404] Step 605 : The network device 104 establishes a user plane connection with the UE 101 .

[0405] Optionally, a user plane connection may be established with the UE 101 through the first network element 102 in the network device 104 .

[0406] Step 606: The network device 104 receives the seventh message sent by the UE 101;

[0407] The seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0408] Optionally, in an embodiment of the present disclosure, the user plane connection establishment completion message includes the first LCS session identifier.

[0409] Optionally, the seventh message sent by UE101 can be received by the second network element 103 in the network device 104; and according to the preset correspondence, the second identifier is mapped to the first identifier, and a third message is sent to the first network element 102, so that the first network element 102 and the second network element 103 in the network device 104 both obtain the user plane establishment completion message sent by UE101; wherein, the third message includes the user plane connection establishment completion message and at least one of the first identifier.

[0410] Optionally, in the embodiment of the present disclosure, after receiving the third message sent by the second network element 103, the first network element 102 may further send a fourth message to the second network element 103;

[0411] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0412] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0413] Step 607 : The network device 104 transmits a message with the UE 101 on the user plane.

[0414] Optionally, step 607 may include the following steps 6071 and / or 6072 .

[0415] Step 6071: The network device 104 sends a fifth message to the UE 101 on the user side.

[0416] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0417] Optionally, in the embodiment of the present disclosure, the fifth message may be sent to the UE 101 on the user side through the first network element 102 in the network device 104 .

[0418] Step 6072: The network device 104 receives, in the user plane, a sixth message sent by the UE 101;

[0419] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0420] Optionally, in the embodiment of the present disclosure, the sixth message sent by the UE 101 may be received on the user plane by the first network element 102 in the network device 104 .

[0421] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0422] 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.

[0423] In the embodiment of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and execution capability, 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, and the logical relationship of the above hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as 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.

[0424] FIG7 is a schematic diagram of the structure of a first network element proposed in an embodiment of the present disclosure. As shown in FIG7 , the first network element 700 may include: a first processing module 701 .

[0425] Optionally, in an embodiment of the present disclosure, the first processing module 701 is configured to determine a first LCS session identifier; wherein the first network element decides to use a user plane to conduct the first LCS session with the terminal UE;

[0426] The messages transmitted in the first LCS session include LCS session-related messages that have not been fully transmitted between the UE and the first network element on the control plane; and the first LCS session identifier is used to identify the first LCS session.

[0427] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes a first identifier or a second LCS session identifier;

[0428] The first identifier is used to identify the second LCS session conducted between the first network element and the UE on the control plane; the second LCS session identifier includes the LCS session identifier allocated by the first network element to the first LCS session.

[0429] Optionally, in an embodiment of the present disclosure, before the first network element decides to use the user plane to conduct the first LCS session with the UE, the first network element conducts the second LCS session with the UE on the control plane; and during the message transmission process of the second LCS session,

[0430] The first network element sends the first identifier to the second network element, or the first network element receives the first identifier sent by the second network element.

[0431] Optionally, in the embodiment of the present disclosure, after determining the first LCS session identifier, the method further includes:

[0432] The first network element associates the first LCS session identifier and / or the first identifier with the first LCS session.

[0433] Optionally, in the embodiment of the present disclosure, the first network element 700 may further include at least one of a first sending module and a third receiving module.

[0434] Optionally, in an embodiment of the present disclosure, the first sending module is used to send a first message to the second network element after the first processing module 700 associates the first LCS session identifier and / or the first identifier with the first LCS session; wherein the first message includes: a user plane connection establishment command message, the first identifier and at least one of the first LCS session identifier.

[0435] Optionally, in an embodiment of the present disclosure, the first message instructs the second network element to map the first identifier to a second identifier; and sends a second message to the UE;

[0436] The second message includes: at least one of the user plane connection establishment command message, the second identifier and the first LCS session identifier.

[0437] Optionally, in the embodiment of the present disclosure, the first processing module 700 is further configured to establish a user plane connection between the first network element and the UE after the first sending module sends the first message to the second network element.

[0438] Optionally, in the embodiment of the present disclosure, the third receiving module is further configured to receive a third message sent by the second network element after the first processing module 700 establishes a user plane connection with the UE;

[0439] The third message includes at least one of a user plane connection establishment completion message and the first identifier.

[0440] Optionally, in an embodiment of the present disclosure, the user plane connection establishment completion message includes the first LCS session identifier.

[0441] Optionally, in the embodiment of the present disclosure, the first sending module is further configured to send a fourth message to the second network element after the third receiving module receives the third message sent by the second network element;

[0442] The fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0443] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0444] Optionally, in the embodiment of the present disclosure, the first sending module is further configured to send a fifth message to the UE on the user side after the third receiving module receives the third message sent by the second network element;

[0445] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0446] Optionally, in the embodiment of the present disclosure, the third receiving module is further configured to receive, on the user plane, a sixth message sent by the UE after receiving the third message sent by the second network element;

[0447] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0448] FIG8 is a schematic diagram of a terminal structure according to an embodiment of the present disclosure. As shown in FIG8 , the terminal 800 may include: a first receiving module 801 .

[0449] Optionally, in an embodiment of the present disclosure, the first receiving module 801 is configured to receive a second message sent by a second network element; wherein the first network element decides to use a user plane to conduct a first LCS session with the terminal UE;

[0450] The second message includes: at least one of a user plane connection establishment command message, a second identifier, and a first LCS session identifier;

[0451] The second identifier is used to identify the second LCS session conducted between the first network element and the UE on the control plane; the first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane.

[0452] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes the first identifier or the second LCS session identifier;

[0453] The first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier allocated by the first network element to the first LCS session.

[0454] Optionally, in the embodiment of the present disclosure, before the first network element decides to use the user plane to conduct the first LCS session with the UE, the UE and the first network element conduct the second LCS session on the control plane;

[0455] The first receiving module 800 is further configured to receive the second identifier sent by the second network element during the message transmission process of the second LCS session.

[0456] Optionally, in the embodiment of the present disclosure, the terminal 800 may further include at least one of a second processing module and a second sending module.

[0457] The second processing module is used to determine that the second identifier is associated with the second LCS session after the first receiving module 800 receives the second message sent by the second network element, and the UE associates the first LCS session identifier and the second identifier with the first LCS session.

[0458] Optionally, in an embodiment of the present disclosure, the second processing module is further configured to establish a user plane connection with the first network element after associating the first LCS session identifier and / or the second identifier with the first LCS session.

[0459] Optionally, in an embodiment of the present disclosure, the second sending module is used to send a seventh message to the second network element after the second processing module establishes a user plane connection with the first network element; wherein, the seventh message includes a user plane establishment completion message and at least one of the second identifier.

[0460] Optionally, in an embodiment of the present disclosure, the user plane connection establishment completion message includes the first LCS session identifier.

[0461] Optionally, in the embodiment of the present disclosure, the seventh message instructs the second network element to map the second identifier to the first identifier and send a third message to the first network element;

[0462] The third message includes at least one of the user plane connection establishment completion message and the first identifier.

[0463] Optionally, in an embodiment of the present disclosure, the first receiving module is also used to receive the fifth message sent by the first network element on the user plane after the second sending module sends the seventh message to the second network element; wherein the fifth message includes the first LCS session identifier; and the fifth message also includes at least one of an LCS message and an LPP message.

[0464] Optionally, in the embodiment of the present disclosure, the second sending module is further configured to send a sixth message to the first network element on the user side after sending the seventh message to the second network element;

[0465] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0466] FIG9 is a schematic diagram of the structure of a second network element proposed in an embodiment of the present disclosure. As shown in FIG9 , the second network element 900 may include: a second receiving module 901 .

[0467] Optionally, in an embodiment of the present disclosure, the second receiving module 901 is configured to receive a first message sent by the first network element; wherein the first network element decides to use the user plane to conduct a first LCS session with the terminal UE;

[0468] The first message includes: at least one of a user plane connection establishment command message, a first identifier, and a first LCS session identifier;

[0469] The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane; the first identifier is used to identify the second LCS session conducted between the first network element and the UE on the control plane.

[0470] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes the first identifier or the second LCS session identifier;

[0471] The first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier allocated by the first network element to the first LCS session.

[0472] Optionally, in the embodiment of the present disclosure, the second network element 900 may further include at least one of a third processing module and a third sending module.

[0473] Before the first network element decides to use the user plane to conduct the first LCS session with the UE, the UE and the first network element conduct the second LCS session on the control plane; and during the message transmission process of the second LCS session,

[0474] The second receiving module 901 is used to receive the first identifier sent by the first network element; or the third sending module is used to send the first identifier to the first network element.

[0475] Optionally, in an embodiment of the present disclosure, after the second receiving module 901 receives the first message sent by the first network element, the third processing module is configured to map the first identifier to a second identifier; and the third sending module is configured to send a second message to the UE;

[0476] The second message includes: the user plane connection establishment command message, the second identifier and at least one of the first LCS session identifier; the second identifier is used to identify the second LCS session.

[0477] Optionally, in an embodiment of the present disclosure, after the third sending module sends the second message to the UE, the second receiving module 901 is also used to receive a seventh message sent by the UE; wherein the seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0478] Optionally, in an embodiment of the present disclosure, the user plane establishment completion message includes the first LCS session identifier.

[0479] Optionally, in an embodiment of the present disclosure, after the second receiving module 901 receives the seventh message sent by the UE, the third processing module is also used to map the second identifier to the first identifier, and the third sending module is also used to send a third message to the first network element; wherein, the third message includes the user plane connection establishment completion message and at least one of the first identifier.

[0480] Optionally, in an embodiment of the present disclosure, after the third sending module sends the third message to the first network element, the second receiving module 901 is further configured to receive a fourth message sent by the first network element; wherein the fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship;

[0481] The user plane connection establishment indication is used to indicate that the user plane connection establishment is completed; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

[0482] FIG10 is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure. As shown in FIG10 , the network device 1000 may include: a fourth processing module 1001 .

[0483] Optionally, in an embodiment of the present disclosure, the fourth processing module 1001 is configured to decide to use a user plane to conduct a first LCS session with the terminal UE, and determine a first LCS session identifier;

[0484] The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include LCS session-related messages that have not been completed between the UE and the first network element on the control plane.

[0485] Optionally, in the embodiment of the present disclosure, the first LCS session identifier includes a first identifier or a second LCS session identifier;

[0486] The first identifier is used to identify a second LCS session conducted between the network device and the UE on the control plane; the second LCS session identifier includes an LCS session identifier allocated by the network device to the first LCS session.

[0487] Optionally, in an embodiment of the present disclosure, the fourth processing module 1001 is further configured to determine the first identifier and the second identifier during message transmission of the second LCS session.

[0488] Optionally, in an embodiment of the present disclosure, the fourth processing module 1001 is further configured to associate the first LCS session identifier and / or the first identifier with the first LCS session after the first LCS session identifier.

[0489] Optionally, in the embodiment of the present disclosure, the network device 1000 may further include at least one of a fourth sending module and a fourth receiving module.

[0490] Optionally, in an embodiment of the present disclosure, the fourth sending module is used to send a second message to the UE after the fourth processing module 1001 associates the first LCS session identifier and / or the first identifier to the first LCS session; wherein the second message includes: a user plane connection establishment command message, the second identifier and at least one of the first LCS session identifier.

[0491] Optionally, in the embodiment of the present disclosure, the fourth processing module 1001 is further configured to establish a user plane connection with the UE after the fourth sending module sends the second message to the UE.

[0492] Optionally, in the embodiment of the present disclosure, the fourth receiving module is further configured to receive a seventh message sent by the UE after the fourth processing module 1001 establishes a user plane connection with the UE;

[0493] The seventh message includes at least one of a user plane establishment completion message and the second identifier.

[0494] Optionally, in an embodiment of the present disclosure, the user plane connection establishment completion message includes the first LCS session identifier.

[0495] Optionally, in the embodiment of the present disclosure, the fourth sending module is further configured to send a fifth message to the UE on the user side after the fourth receiving module receives the seventh message sent by the UE;

[0496] The fifth message includes the first LCS session identifier; the fifth message also includes at least one of an LCS message and an LPP message.

[0497] Optionally, in the embodiment of the present disclosure, the fourth receiving module is further configured to receive, on the user plane, a sixth message sent by the UE after receiving the seventh message sent by the UE;

[0498] The sixth message includes the first LCS session identifier; the sixth message also includes at least one of an LCS message and an LPP message.

[0499] Figure 11 is a schematic diagram of the structure of a terminal 1100 (e.g., user equipment) proposed in an embodiment of the present disclosure. Terminal 1100 can be a chip, chip system, or processor that supports a network device implementing any of the above methods, or a chip, chip system, or processor that supports a terminal implementing any of the above methods. Terminal 1100 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.

[0500] As shown in Figure 11, terminal 1100 includes one or more processors 1101. Processor 1101 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 communication protocols and communication data, and the central processing unit can be used to control communication devices (such as base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Terminal 1100 is used to perform any of the above methods.

[0501] In some embodiments, the terminal 1100 further includes one or more memories 1102 for storing instructions. Optionally, all or part of the memories 1102 may be located outside the terminal 1100.

[0502] In some embodiments, the terminal 1100 further includes one or more transceivers 1104. When the terminal 1100 includes one or more transceivers 1104, the transceiver 1104 performs the communication steps such as sending and / or receiving in the above method (for example, step 203, step 204, step 207, step 208, step 2081, step 2082, step 303, step 305, step 306, step 307, step 402, step 405, step 406, step 4061, step 4062, step 501, step 502, step 503, step 504, step 601). , step 604, step 606, step 607, step 6071, step 6072, but not limited to these), the processor 1101 executes at least one of the other steps (for example, step 201, step 202, step 204, step 205, step 206, step 207, step 301, step 302, step 304, step 401, step 403, step 404, step 502, step 504, step 602, step 603, step 605, but not limited to these).

[0503] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0504] In some embodiments, terminal 1100 may include one or more interface circuits 1103. Optionally, interface circuit 1103 is connected to memory 1102. Interface circuit 1103 may be configured to receive signals from memory 1102 or other devices, and may be configured to send signals to memory 1102 or other devices. For example, interface circuit 1103 may read instructions stored in memory 1102 and send the instructions to processor 1101.

[0505] The terminal 1100 described in the above embodiment may be a communication device such as a user device, but the scope of the terminal 1100 described in the present disclosure is not limited thereto, and the structure of the terminal 1100 may not be limited by FIG. 11 . 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 network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0506] FIG12 is a schematic diagram of the structure of a chip 1200 according to an embodiment of the present disclosure. In the case where the terminal 1100 may be a chip or a chip system, reference may be made to the schematic diagram of the structure of the chip 1200 shown in FIG12 , but the present disclosure is not limited thereto.

[0507] The chip 1200 includes one or more processors 1201 , and the chip 1200 is configured to execute any of the above methods.

[0508] In some embodiments, chip 1200 further includes one or more 1203. Optionally, interface circuit 1203 is connected to memory 1202. Interface circuit 1203 can be used to receive signals from memory 1202 or other devices, and interface circuit 1203 can be used to send signals to memory 1202 or other devices. For example, interface circuit 1203 can read instructions stored in memory 1202 and send the instructions to processor 1201.

[0509] In some embodiments, the interface circuit 1203 performs the communication steps of sending and / or receiving in the above method (e.g., step 203, step 204, step 207, step 208, step 2081, step 2082, step 303, step 305, step 306, step 307, step 401, step 404, step 405, step 4051, step 4052, step 501, step 502, step 503, step 504, step 601, step 606). 04, step 606, step 607, step 6071, step 6072, but not limited to these), the processor 1201 executes at least one of the other steps (for example, step 201, step 202, step 204, step 205, step 206, step 207, step 301, step 302, step 304, step 402, step 403, step 502, step 504, step 602, step 603, step 605, but not limited to these).

[0510] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0511] In some embodiments, chip 1200 further includes one or more memories 1202 for storing instructions. Alternatively, all or part of memory 1202 may be external to chip 1200.

[0512] The present disclosure also provides a storage medium having instructions stored thereon. When the instructions are executed on the terminal 1100, the terminal 1100 executes 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 transient storage medium.

[0513] The present disclosure also provides a program product, which, when executed by the terminal 1100, enables the terminal 1100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0514] 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 includes: A first network element determines to use the user plane to conduct a first LCS session with a terminal UE, and the first network element determines a first LCS session identifier; Wherein, the messages transmitted in the first LCS session include LCS session related messages that are not completely transmitted between the UE and the first network element on the control plane; the first LCS session identifier is used to identify the first LCS session.

2. The communication method according to claim 1, wherein The first LCS session identifier includes a first identifier or a second LCS session identifier; Wherein, the first identifier is used to identify a second LCS session conducted between the first network element and the UE on the control plane; the second LCS session identifier includes the LCS session identifier allocated by the first network element for the first LCS session.

3. The communication method according to claim 1, wherein The method further includes: During the message transmission process of the second LCS session, the first network element sends the first identifier to a second network element, or the first network element receives the first identifier sent by the second network element.

4. The communication method according to claim 2, wherein After the first network element determines the first LCS session identifier, the method further includes: The first network element associates the first LCS session identifier and / or the first identifier with the first LCS session.

5. The communication method according to claim 4, wherein After the first network element associates the first LCS session identifier and / or the first identifier with the first LCS session, the method further includes: The first network element sends a first message to a second network element; wherein, the first message includes at least one of a user plane connection establishment command message, the first identifier, and the first LCS session identifier.

6. The communication method according to claim 5, wherein The first message instructs the second network element to map the first identifier to a second identifier; And send a second message to the UE; Wherein, the second message includes at least one of the user plane connection establishment command message, the second identifier, and the first LCS session identifier.

7. The communication method according to claim 5, characterized in that, After the first network element sends the first message to the second network element, the method further includes: The first network element establishes a user plane connection with the UE.

8. The communication method according to claim 7, wherein After the first network element establishes a user plane connection with the UE, the method further includes: The first network element receives a third message sent by the second network element; Wherein, the third message includes at least one of a user plane connection establishment completion message and the first identifier.

9. The communication method according to claim 8, characterized in that, The user plane connection establishment completion message includes the first LCS session identifier.

10. The communication method according to claim 8, wherein, After the first network element receives the third message sent by the second network element, the method further includes: The first network element sends a fourth message to the second network element; Wherein, the fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship; The user plane connection establishment indication is used to indicate that the user plane connection is established; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

11. The communication method according to claim 8, wherein After the first network element receives the third message sent by the second network element, the method further includes: The first network element sends a fifth message to the UE on the user plane; Wherein, the fifth message includes the first LCS session identifier; the fifth message further includes at least one of an LCS message and an LPP message.

12. The communication method according to claim 8, wherein After the first network element receives the third message sent by the second network element, the method further includes: The first network element receives a sixth message sent by the UE on the user plane; Wherein, the sixth message includes the first LCS session identifier; the sixth message further includes at least one of an LCS message and an LPP message.

13. A communication method, characterized in that, The method includes: The terminal UE receives a second message sent by the second network element; Wherein, the second message includes at least one of a user plane connection establishment command message, a second identifier, and a first LCS session identifier; The first LCS session identifier is used to identify a first LCS session, and the messages transmitted in the first LCS session include LCS session related messages that are not completely transmitted between the UE and the first network element on the control plane; the second identifier is used to identify a second LCS session between the first network element and the UE on the control plane.

14. The communication method according to claim 13, wherein, The first LCS session identifier includes the first identifier or the second LCS session identifier; Wherein, the first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier assigned by the first network element for the first LCS session.

15. The communication method according to claim 13, wherein The method further includes: During the message transmission of the second LCS session, the UE receives the second identifier sent by the second network element.

16. The communication method according to claim 13, wherein After the UE receives the second message sent by the second network element, the method further includes: The UE determines that the second identifier is associated with the second LCS session, and the UE associates the first LCS session identifier and / or the second identifier with the first LCS session.

17. The communication method according to claim 16, wherein After the UE associates the first LCS session identifier and / or the second identifier with the first LCS session, the method further includes: The UE establishes a user plane connection with the first network element.

18. The communication method according to claim 17, wherein After the UE establishes a user plane connection with the first network element, the method further includes: The UE sends a seventh message to the second network element; Wherein, the seventh message includes at least one of a user plane establishment completion message and the second identifier.

19. The communication method according to claim 18, wherein The user plane connection establishment completion message includes the first LCS session identifier.

20. The communication method according to claim 18, wherein, The seventh message instructs the second network element to map the second identifier to the first identifier and send a third message to the first network element; Wherein, the third message includes at least one of a user plane connection establishment completion message and the first identifier.

21. The communication method according to claim 18, wherein After the UE sends the seventh message to the second network element, the method further includes: The UE receives a fifth message sent by the first network element on the user plane; Wherein, the fifth message includes the first LCS session identifier; the fifth message further includes at least one of an LCS message and an LPP message.

22. The communication method according to claim 18, wherein After the UE sends a seventh message to the second network element, the method further includes: The UE sends a sixth message to the first network element for the user. Wherein, the sixth message includes the first LCS session identifier; the sixth message further includes at least one of an LCS message and an LPP message.

23. A communication method, characterized in that The method includes: The second network element receives a first message sent by the first network element. Wherein, the first message includes at least one of a user plane connection establishment command message, a first identifier, and a first LCS session identifier. The first LCS session identifier is used to identify a first LCS session, and the messages transmitted in the first LCS session include LCS session related messages that the UE and the first network element have not completed transmitting on the control plane; the first identifier is used to identify a second LCS session that the first network element and the UE perform on the control plane.

24. The communication method according to claim 23, wherein The first LCS session identifier includes the first identifier or a second LCS session identifier. Wherein, the first identifier is used to identify the second LCS session; the second LCS session identifier includes the LCS session identifier assigned by the first network element for the first LCS session.

25. The communication method according to claim 23, wherein The method further includes: During the message transmission of the second LCS session, the second network element receives the first identifier sent by the first network element; or, the second network element sends the first identifier to the first network element.

26. The communication method according to claim 23, wherein After the second network element receives the first message sent by the first network element, the method further includes: The second network element maps the first identifier to a second identifier; and sends a second message to the UE. Wherein, the second message includes at least one of the user plane connection establishment command message, the second identifier, and the first LCS session identifier; the second identifier is used to identify the second LCS session.

27. The communication method according to claim 26, wherein After the second network element sends the second message to the UE, the method further includes: The second network element receives a seventh message sent by the UE. Wherein, the seventh message includes at least one of a user plane establishment completion message and the second identifier.

28. The communication method according to claim 27, wherein The user plane establishment completion message includes the first LCS session identifier.

29. The communication method according to claim 27, wherein After the second network element receives the seventh message sent by the UE, the method further includes: The second network element maps the second identifier to the first identifier and sends a third message to the first network element. Wherein, the third message includes at least one of the user plane connection establishment completion message and the first identifier.

30. The communication method according to claim 29, wherein After the second network element sends the third message to the first network element, the method further includes: The second network element receives a fourth message sent by the first network element. Wherein, the fourth message includes at least one of a user plane connection establishment indication, the first LCS session identifier, the first identifier, and an association relationship. The user plane connection establishment indication is used to indicate the completion of the establishment of the user plane connection; the association relationship includes the association relationship between the first LCS session identifier and the first identifier.

31. A communication method, characterized in that, The method includes: The network device determines to use the user plane to perform a first LCS session with the terminal UE and determines a first LCS session identifier; Wherein, the first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include the LCS session-related messages that have not been completely transmitted between the UE and the first network element on the control plane.

32. A first network element, characterized in that, It includes: A first processing module, configured to determine to use the user plane to perform a first LCS session with the terminal UE and determine a first LCS session identifier; Wherein, the messages transmitted in the first LCS session include the LCS session-related messages that have not been completely transmitted between the UE and the first network element on the control plane; the first LCS session identifier is used to identify the first LCS session.

33. A terminal, characterized in that, It includes: A first receiving module, configured to receive a second message sent by a second network element; Wherein, the second message includes at least one of: a user plane connection establishment command message, a second identifier, and a first LCS session identifier; The second identifier is used to identify a second LCS session performed between the first network element and the UE on the control plane; the first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include the LCS session-related messages that have not been completely transmitted between the UE and the first network element on the control plane.

34. A second network element, characterized in that, It includes: A second receiving module, configured to receive a first message sent by a first network element; Wherein, the first message includes at least one of: a user plane connection establishment command message, a first identifier, and a first LCS session identifier; The first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include the LCS session-related messages that have not been completely transmitted between the UE and the first network element on the control plane; the first identifier is used to identify a second LCS session performed between the first network element and the UE on the control plane.

35. A network device, characterized in that, It includes: A fourth processing module, configured to determine to use the user plane to perform a first LCS session with the terminal UE and determine a first LCS session identifier; Wherein, the first LCS session identifier is used to identify the first LCS session; the messages transmitted in the first LCS session include the LCS session-related messages that have not been completely transmitted between the UE and the first network element on the control plane.

36. A first network element, characterized in that, It includes: One or more processors; Wherein, the first network element is configured to execute the communication method according to any one of claims 1 to 12.

37. A terminal, characterized in that, It includes: One or more processors; Wherein, the terminal is configured to execute the communication method according to any one of claims 13 to 22.

38. A second network element, characterized in that, It includes: One or more processors; Wherein, the second network element is configured to execute the communication method according to any one of claims 23 to 30.

39. A network device, characterized in that, It includes: One or more processors; Wherein, the network device is configured to execute the communication method according to claim 31.

40. A communication system, characterized in that, It includes a first network element, a terminal, and a second network element; wherein, the first network element is configured to implement the communication method described in any one of claims 1 to 12, the terminal is configured to implement the communication method described in any one of claims 13 to 22, and the second network element is configured to implement the communication method described in any one of claims 23 to 30.

41. A storage medium storing instructions, characterized in that, When the instruction runs on a communication device, it causes the communication device to execute the communication method described in any one of claims 1 to 12, or execute the communication method described in any one of claims 13 to 22, or execute the communication method described in any one of claims 23 to 30.

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