Signaling transmission method and device

Abstract

The present application provides a signaling transmission method and apparatus that can improve signaling transmission efficiency. The method includes: a first terminal device recovering at least one dedicated signaling radio bearer based on a saved context, the first terminal device being in an inactive state; the first terminal device sending a first message to a first radio access network device, the first message including first non-access stratum (NAS) signaling sent by the first terminal device to a core network device, the first NAS signaling being carried on one of the at least one dedicated signaling radio bearer.

Description

Technical Field

[0001] The present application relates to the field of communications, and more particularly, to a method and apparatus for signaling transmission. Background Art

[0002] In traditional communications, user equipment (UE) initiates a connection establishment process and, after entering the connected state, can perform uplink transmissions over dedicated radio signaling bearers. However, the signaling overhead associated with entering the connected state far exceeds the amount of data being transmitted, resulting in inefficient data transmission. Currently, much research is focused on early data transmission, which allows the UE to transmit data without entering the connected state. This can effectively improve data transmission efficiency and reduce UE power consumption.

[0003] However, current early transmission technologies primarily focus on data transmission and fail to consider signaling transmission. In reality, some signaling data is small in size but frequently reported. Frequently entering the connected state for signaling transmission wastes power, making early transmission of signaling a pressing technical issue. Summary of the Invention

[0004] The present application provides a method and apparatus for signaling transmission, which can improve the efficiency of signaling transmission.

[0005] In a first aspect, a method for signaling transmission is provided, the method comprising: a first terminal device recovering at least one dedicated signaling radio bearer based on a saved context, the first terminal device being in an inactive state; the first terminal device sending a first message to a first wireless access network device, the first message including a first non-access layer NAS signaling sent by the first terminal device to a core network device, the first NAS signaling being carried on one of the at least one dedicated signaling radio bearer.

[0006] Based on the above technical solution, the first terminal device in an inactive state can send uplink signaling to the core network device without entering a connected state, which can effectively improve the efficiency of signaling transmission and reduce the energy consumption of the first terminal device.

[0007] In one possible implementation, the method further includes: the first terminal device receives a second message sent by the first wireless access network device, the second message includes a second non-access layer NAS signaling sent by the core network device to the first terminal device, and the second message is a response message to the first message.

[0008] Based on the above technical solution, the first terminal device in the inactive state can receive the downlink NAS signaling sent by the core network device without entering the connected state, which can effectively improve the efficiency of signaling transmission and reduce the energy consumption of the first terminal device.

[0009] In a possible implementation, the first message includes a radio resource control (RRC) recovery request message.

[0010] In a possible implementation, the second message includes a radio resource control (RRC) resume message or a radio resource control (RRC) release message.

[0011] In a possible implementation, the first NAS signaling includes a positioning protocol message or a tracking area update message, and the second NAS signaling includes a positioning protocol message or a tracking area update response message.

[0012] According to a second aspect, a method for signaling transmission is provided, including: a first wireless access network device receives a first message sent by a first terminal device, the first message including a first non-access layer (NAS) signaling sent by the first terminal device to a core network device, wherein the first terminal device is in an inactive state; and the first wireless access network device sends a third message, the third message including the first NAS signaling.

[0013] In a possible implementation, the method also includes: the first wireless access network device receives a fourth message, the fourth message includes a second non-access layer NAS signaling sent by the core network device to the first terminal device; the first wireless access network device sends a second message to the first terminal device, the second message includes the second NAS signaling, and the second message is a response message to the first message.

[0014] In a possible implementation, the first wireless access network device sends the third message, including: the first wireless access network device sends the third message to the core network device; the first wireless access network device receives the fourth message, including: the first wireless access network device receives the fourth message sent by the core network device.

[0015] In a possible implementation manner, the third message includes a path switch request message; and the fourth message includes a path switch response message.

[0016] In a possible implementation, the first wireless access network device sends a third message, including: the first wireless access network device sends the third message to the second wireless access network device; the first wireless access network device receives a fourth message, including: the first wireless access network device receives the fourth message sent by the second wireless access network device.

[0017] In one possible implementation, the third message includes a get context request message and first indication information, where the first indication information is used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type; the fourth message includes a get context response message and second indication information, where the second indication information is used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type.

[0018] According to a third aspect, a method for signaling transmission is provided, including: a second wireless access network device receives a third message sent by a first wireless access network device, the third message including a first non-access layer (NAS) signaling sent by a first terminal device to a core network device, wherein the first terminal device is in an inactive state; and the second wireless access network device sends a fifth message to the core network device, the fifth message including the first NAS signaling.

[0019] In a possible implementation, the method also includes: the second radio access network device receives a sixth message sent by the core network device, the sixth message including a second non-access layer NAS signaling sent by the core network device to the first terminal device; the second radio access network device sends a fourth message to the first radio access network device, the fourth message including the second NAS signaling.

[0020] In a possible implementation manner, the fifth message includes an uplink non-access stratum (NAS) transmission message; and the sixth message includes a downlink non-access stratum (NAS) transmission message.

[0021] In a fourth aspect, a method for signaling transmission is provided, including: a core network device receives a third message sent by a first wireless access network device, the third message including a first non-access layer NAS signaling sent by a first terminal device to the core network device, wherein the first terminal device is in an inactive state.

[0022] In a possible implementation, the method further includes: the core network device sending a fourth message to the first radio access network device, where the fourth message includes a second non-access stratum (NAS) signaling sent by the core network device to the first terminal device.

[0023] In a possible implementation manner, the third message includes a path switch request message; and the fourth message includes a path switch response message.

[0024] In a fifth aspect, a method for signaling transmission is provided, including: a core network device receives a fifth message sent by a second wireless access network device, the fifth message including a first non-access layer NAS signaling sent by a first terminal device to the core network device, wherein the first terminal device is in an inactive state.

[0025] In a possible implementation, the method further includes: the core network device sending a sixth message to the second radio access network device, where the sixth message includes a second non-access stratum NAS signaling sent by the core network device to the first terminal device.

[0026] In a possible implementation manner, the fifth message includes an uplink non-access stratum (NAS) transmission message; and the sixth message includes a downlink non-access stratum (NAS) transmission message.

[0027] In a sixth aspect, a method for signaling transmission is provided, including: a first terminal device determines a seventh message, the seventh message including a first non-access layer NAS signaling and a third indication information sent by the first terminal device to a core network device, the third indication information being used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type, wherein the first terminal device is in a non-connected state; the first terminal device sends the seventh message to the first wireless access network device through a public signaling radio bearer.

[0028] In a possible implementation, the method also includes: the first terminal device receives an eighth message sent by the first wireless access network device, the eighth message includes the second non-access layer NAS signaling and fourth indication information sent by the core network device to the first terminal device, the fourth indication information is used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type, and the eighth message is a response message to the seventh message.

[0029] In a possible implementation, the seventh message includes a data early transmission request message; the eighth message includes a data early transmission completion message, wherein the data early transmission request message includes an identifier of the first terminal device.

[0030] In a possible implementation, the first NAS signaling includes a positioning protocol message or a tracking area update message, and the second NAS signaling includes a positioning protocol message or a tracking area update response message.

[0031] In the seventh aspect, a method for signaling transmission is provided, including: a first wireless access network device receives a seventh message sent by a first terminal device, the seventh message including a first non-access layer NAS signaling and a third indication information sent by the first terminal device to a core network device, the third indication information being used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type, wherein the first terminal device is in a non-connected state; the first wireless access network device sends a ninth message to the core network device, the ninth message including the first NAS signaling.

[0032] In a possible implementation, the method further includes: the first wireless access network device receives a tenth message sent by the core network device, the tenth message including a second non-access layer NAS signaling sent by the core network device to the first terminal device; the first wireless access network device sends an eighth message to the first terminal device, the eighth message including the second non-access layer NAS signaling sent by the core network device to the first terminal device and fourth indication information, the fourth indication information being used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type.

[0033] In a possible implementation, the first terminal device is in an inactive state; the ninth message and the tenth message include an identifier of the first terminal device.

[0034] In a possible implementation, the first terminal device is in an idle state; the ninth message includes an initial message for establishing a next generation NG interface; and the tenth message includes a downlink non-access layer universal transmission message.

[0035] In an eighth aspect, a method for signaling transmission is provided, comprising: a core network device receives a ninth message sent by a first wireless access network device, the ninth message including a first non-access layer NAS signaling sent by a first terminal device to the core network device, wherein the first terminal device is in a non-connected state.

[0036] In a possible implementation, the method further includes: the core network device sends a tenth message to the first wireless access network device, the tenth message includes a second non-access layer NAS signaling sent by the core network device to the first terminal device, and the tenth message is a response message to the ninth message.

[0037] In a ninth aspect, a communication device is provided, comprising: a unit for implementing the functions of the method in the first to eighth aspects or any possible implementation manner of the first to eighth aspects.

[0038] In the tenth aspect, a communication chip is provided, comprising a processor and a communication interface, wherein the processor is used to read instructions to execute the method in any possible implementation of the first to eighth aspects or the first to eighth aspects.

[0039] In the eleventh aspect, a communication device is provided, comprising: a processor and a transceiver, wherein the transceiver is used to receive computer code or instructions and transmit them to the processor, and the processor executes the computer code or instructions, such as the method in any possible implementation of the first to eighth aspects or the first to eighth aspects.

[0040] In the twelfth aspect, a communication device is provided, comprising: a memory and a processor, the memory being used to store a computer program, the processor being used to execute the computer program stored in the memory, so that the communication device executes the method in any possible implementation of aspects 1 to 8 or aspects 1 to 8.

[0041] In the thirteenth aspect, a computer-readable storage medium is provided, wherein the computer-readable medium stores a computer program; when the computer program runs on a computer, the computer executes the method in any possible implementation of the first to eighth aspects or the first to eighth aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the protocol architecture for positioning-related signaling transmission between a terminal device and a positioning server.

[0043] Figure 2 Schematic diagram of the relationship between the RRC_connected state, RRC_inactive state and RRC_idle state of the UE.

[0044] Figure 3 The figure is a schematic flow diagram of an early data transmission method.

[0045] Figure 4 The following is a schematic flow diagram of another method for early data transmission.

[0046] Figure 5 This is a schematic flow chart of a signaling transmission method according to an embodiment of the present application.

[0047] Figure 6 This is a schematic flow chart of another signaling transmission method according to an embodiment of the present application.

[0048] Figure 7 This is a schematic flow chart of another signaling transmission method according to an embodiment of the present application.

[0049] Figure 8 This is a schematic flow chart of another signaling transmission method according to an embodiment of the present application.

[0050] Figure 9 This is a schematic flow chart of another signaling transmission method according to an embodiment of the present application.

[0051] Figure 10 This is a schematic flow chart of another signaling transmission method according to an embodiment of the present application.

[0052] Figure 11 This is a schematic block diagram of a communication device according to an embodiment of the present application.

[0053] Figure 12 This is a schematic block diagram of another communication device according to an embodiment of the present application.

[0054] Figure 13 This is a schematic block diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0055] The technical solution in this application will be described below with reference to the accompanying drawings.

[0056] The embodiments of the present application can be applied to long term evolution (LTE) systems, fifth generation (5G) systems, or new communication systems that will appear in the future.

[0057] The terminal devices involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. The terminal may be a mobile station (MS), a subscriber unit (subscriber unit), a user equipment (UE), a cellular phone, a smart phone, a wireless data card, a personal digital assistant (PDA), a computer, a tablet computer, a wireless modem, a handheld device (handset), a laptop computer, a machine type communication (MTC) terminal, etc.

[0058] In traditional communications, a UE initiates a connection establishment process and, after entering the connected state, can perform uplink transmissions using dedicated radio signaling bearers. However, the signaling overhead associated with entering the connected state is significantly greater than the amount of data being transmitted, resulting in inefficient data transmission. Currently, much research is focused on early data transmission, which allows the UE to transmit data without entering the connected state. This can effectively improve data transmission efficiency and reduce UE power consumption.

[0059] However, current early transmission technologies focus primarily on data transmission and do not consider signaling transmission. In reality, some signaling data is small but reported frequently. If the UE frequently enters the connected state for signaling transmission, it will waste power.

[0060] For example, in positioning technology, both the current LTE and new radio (NR) support positioning technology based on cellular networks. The positioning-related signaling transmitted between the UE and the location management function (LMF) is carried in the LTE positioning protocol (LPP) message. The LPP message is encapsulated in the non-access stratum (NAS) signaling when transmitted between the UE and the access and mobility management function (AMF). The NAS signaling is then transmitted between the UE and the base station through the RRC message. The protocol architecture is as follows: Figure 1 As shown in the figure, L1 is the wireless air interface physical layer or the wired physical layer, L2 is the data link layer, SCTP is a stream control transmission protocol (SCTP). NGAP is the application layer protocol for the direct interface between the base station and the AMF. TLS is the transport layer security protocol. IP is the Internet protocol. TCP is the transmission control protocol. HTTP / 2 is the second version of the Hypertext Transfer Protocol. It should be noted that Figure 1 This is a schematic diagram, and this solution can also be used in other protocol architectures. The LPP message transmitted by the UE to the LMF may include the UE's positioning measurement message, and in some scenarios, the positioning measurement message needs to be reported to the LMF frequently.

[0061] In order to facilitate the understanding of the embodiments of the present application, a brief description is given of the process of the UE entering the RRC inactive state from the radio resource control (RRC) connected state and then entering the RRC_connected state from the RRC_inactive state. Figure 2As shown, a schematic diagram of the relationship between the RRC_connected state, RRC_inactive state and RRC idle state of the UE is presented. The RRC_inactive state can be changed from the RRC_connected state through the RRC release message. When the UE is released from the RRC_connected state to the RRC_inactive state, the serving base station allocates an inactive-radio network temporary identifier (I-RNTI) to the UE and uses this identifier to store the UE's context. This base station is also called the UE's anchor base station. When the UE sends a connection recovery request message, it carries the I_RNTI identifier to the target base station. The target base station obtains the UE's context from the anchor base station based on the I_RNTI identifier. In this process, in order to ensure the security of the access layer, certain security processing is performed, which mainly includes the following parts, where the access layer refers to the protocol layer required for the terminal device to communicate with the base station. For NR, the access layer includes the physical (PHY) layer, the MAC layer, the radio link control layer, and the packet data convergence protocol layer. The security of the access layer refers to the security of direct information transmission between the terminal device and the base station:

[0062] (1) When the UE changes from the RRC_connected state to the RRC_inactive state, the RRCrelease message sent by the base station to the UE carries not only the I_RNTI but also the network color code (NCC). This NCC is used for key derivation.

[0063] (2) The anchor base station deletes the UE's access layer keys K_RRCenc, K_UPenc, and K_UPint, but retains K_RRCint. K_RRCenc is used for control plane data encryption, K_UPenc is used for user plane data encryption, K_UPint is used for user plane data integrity protection, and K_RRCint is used for control plane data integrity protection. If the NCC sent by the anchor base station to the UE is new and belongs to an unused {NCC, NH} pair, the anchor base station retains this {NCC, NH} pair and deletes the current access layer (AS) key K_gNB. If the NCC sent by the anchor base station to the UE is associated with the current key K_gNB, the AS key K_gNB and NCC are retained.

[0064] (3) When a connected UE receives the RRC Release message containing the I_RNTI and NCC from the anchor eNB, the UE first verifies the integrity of the RRC Release message by checking the packet data convergence protocol (PDCP) message authentication code for integrity (MAC-I). If the integrity is correct, the UE stores its own context together with the received NCC and deletes K_RRCenc, K_UPenc, and K_UPint, but retains K_RRCint. If the stored NCC is unrelated to the current K_gNB, the current K_gNB is deleted. If they are consistent, the current K_gNB is retained. It should be understood that the UE context includes the configuration of dedicated signaling radio bearers (SRBs), such as SRB1 or SRB2.

[0065] (4) When the UE sends an RRC resume message to enter the connected state, the RRC resume message should carry I_RNTI and a short MAC-I. The short MAC-I is a 16-bit authentication message. The UE uses the cell radio network temporary identifier (C-RNTI) of the source cell when the UE is working on the anchor base station, the physical cell identifier (PCI) of the source cell, and the cell identifier (ID) of the current cell as input, and uses other parameters including K_RRCint as input to the integrity algorithm to calculate the short MAC-I.

[0066] (5) After receiving the RRC resume message sent by the UE, the target base station finds the anchor base station based on the I-RNTI and sends a UE context request message to the anchor base station through the Xn interface between base stations. The request message includes the I-RNTI, shortMAC-I, and the cell ID of the target base station.

[0067] (6) After receiving the UE Context Request message from the target base station, the anchor base station finds the stored UE context based on the I-RNTI. Using the previously stored K_RRCint, the anchor base station calculates the short MAC-I using the same method as in (4). This is then verified against the short MAC-I in the Context Request message from the target base station. If the verification succeeds, the anchor base station derives a new K_gNB* using the target base station's cell ID, the carrier frequency of the target base station's cell, and the K_gNB stored in the anchor base station or the NH indicated by the NCC. The anchor base station then sends a reply message to the target base station, which includes the UE context, the newly derived K_gNB*, and the NCC associated with this K_gNB*.

[0068] (7) After the target base station obtains the UE context, it checks whether it supports the security and encryption algorithms in the context. If so, it uses the algorithms in the context and the obtained K_gNB* to derive K_RRCint, K_RRCenc, K_UPenc, and K_UPint.

[0069] (8) After or simultaneously with sending the RRC resume message to the target base station, the UE takes the PCI of the target cell, the target cell frequency, and the K_gNB or the stored NH of the NCC identifier as input to derive a new K_gNB*, and then derives K_RRCint, K_RRCenc, K_UPenc, and K_UPint based on K_gNB*.

[0070] (9) At this point, the target base station can use its derived K_RRCint, K_RRCenc, K_UPenc and K_UPint to send data to the UE, and the UE can receive the data sent by the target base station based on its own derived K_RRCint, K_RRCenc, K_UPenc and K_UPint.

[0071] After receiving the RRC release message, the UE can be released (suspended) from the RRC_connected state to the RRC_inactive state or the RRC_idle state; after receiving the RRC release message, the UE in the RRC_inactive state can be released (suspended) to the RRC_idle state; after receiving the RRC resume message, the UE in the RRC_inactive state or the RRC_idle state can enter the RRC_connected state.

[0072] In order to facilitate the understanding of the embodiments of the present application, a brief introduction to the signaling radio bearer (SRB) is given. In LTE or NR, SRB is used to transmit RRC messages and NAS messages. The transmission channels of SRB include SRB0, SRB1, SRB2, and SRB3; SRB0 uses the common control channel (CCCH), and SRB1, SRB2, and SRB3 all use the dedicated control channel (DCCH). SRB2 is used to carry NAS signaling, and SRB1 can also be used to transmit NAS signaling before SRB2 is established. In the dual-connection application scenario, SRB0, SRB1, and SRB2 are all used for signaling transmission between the UE and the primary base station; SRB3 is used for signaling transmission between the UE and the secondary base station.

[0073] The RRC resume request (radio resource control resume request, RRC resume request) message, RRC data early transmission request (radio resource control early data transmission request, RRC EDT request) message, and RRC data early transmission completion (radio resource control early data transmission complete, RRC EDT complete) message involved in the embodiments of the present application are carried on SRB0, and the RRC resume (radio resource control resume, RRC resume) message and RRC release (radio resource control release, RRC release) message involved in the embodiments of the present application are carried on SRB1.

[0074] At present, data early transmission technology is widely used, such as Figure 3 As shown, a schematic flow diagram of a method for early data transmission is presented. The specific steps include:

[0075] 310. After obtaining an uplink scheduling grant (UL grant) through a random access procedure, the UE in the idle state sends an RRC EDT request message to the base station. The message includes the UE's S-temporary mobile subscriber identity (S-TMSI), the link establishment reason (data transmission or delay-tolerable service), and dedicated NAS information (dedicated info NAS). The dedicated info NAS includes the uplink data to be sent by the UE.

[0076] 320. After receiving the RRC EDT request message from the UE, the base station sends an initial UE message to the core network control plane device to establish an S1 interface for the UE. The core network control plane device includes a mobility management entity (MME) or an AMF. The initial UE message carries a NAS data protocol data unit (NAS DATA PDU), which is the uplink data to be sent by the UE.

[0077] 330. The core network control plane device and the serving gateway (S-GW) perform a bearer modification operation on the UE.

[0078] 340. The core network control plane device sends the uplink data to be sent by the UE to the S-GW.

[0079] 350. If the S-GW happens to have the downlink data of the UE, the downlink data of the UE is sent to the core network control plane device.

[0080] 360. If the core network control plane device receives the downlink data of the UE sent by the S-GW, it will carry the downlink data to the base station via a downlink NASDATA PDU.

[0081] 370. The core network control plane device may send a connection establishment indication to the UE to inform the base station that the S1 interface for the UE has been established.

[0082] 380. After receiving the downlink data from the UE, the base station sends a dedicated info NAS to the UE via an RRC EDT complete message, where the dedicated info NAS carries the downlink data.

[0083] 390. The base station and the core network control plane device release the S1 interface of the UE.

[0084] 391. The core network control plane device and the S-GW modify the bearer of the UE.

[0085] like Figure 4 As shown, a schematic flow diagram of another method for early data transmission is presented. The specific steps include:

[0086] 410. After obtaining a UL grant through a random access procedure, the UE in an inactive state sends an RRC resume request message and uplink data to be sent by the UE to the target base station. The uplink data is carried on a data radio bearer (DRB).

[0087] 420. After receiving the RRC resume request message, the target base station sends a context request message to the anchor base station to obtain the context of the UE. It should be understood that the anchor base station is the original serving base station of the UE, and the anchor base station is also the base station that releases the UE from the connected state to the inactive state.

[0088] 430 , the anchor base station sends a context response message to the target base station according to the received context request message, and sends the UE context to the target base station.

[0089] 440. After obtaining the UE context, the target base station sends a path switch request message to the core network control plane device.

[0090] 450. After receiving the path switch request message, the core network control plane device modifies the bearer of the UE with the S-GW.

[0091] 460. The core network control plane device sends a path switch response message to the target base station.

[0092] 470. The target base station notifies the anchor base station to release the context of the UE.

[0093] 480. The target base station sends the UE's uplink data to the S-GW according to the instruction in the path switch response message.

[0094] 490. If the S-GW has downlink data for the UE, it sends the downlink data to the target base station.

[0095] 491. The target base station interacts with the core network control plane device to release the S1 interface of the UE.

[0096] 492. The core network control plane device and the S-GW modify the bearer of the UE.

[0097] 493. The target base station sends an RRC connection release message to the UE and sends the downlink data of the UE to the UE. The downlink data is also carried in the DRB.

[0098] The above-mentioned early data transmission solution cannot support early signaling transmission. Therefore, early signaling transmission is a technical problem that needs to be solved urgently.

[0099] The embodiment of the present application proposes a signaling transmission method, which can improve the efficiency of signaling transmission and reduce the energy consumption of UE. Figure 5 As shown, a schematic flow chart of a signaling transmission method is presented.

[0100] 510. The first terminal device is released from the connected state to the inactive state by the original serving base station (second radio access network device). When the first terminal device needs to transmit uplink NAS signaling, at least one dedicated signaling radio bearer is restored according to the saved context, where the dedicated radio signaling bearer includes SRB1, SRB2, SRB3, or other dedicated SRBs subsequently expanded. It should be understood that the second radio access network device is the anchor base station of the first terminal device or the access network device that last provided service.

[0101] It should be understood that the connection state in the embodiment of the present application refers to the RRC_connected state, the inactive state refers to the RRC_inactive state, and the idle state refers to the RRC_idle state. The first terminal device is in a connected state, which means that an RRC connection has been established between the first terminal device and the access network device; the first terminal device is in an inactive state, which means that the RRC connection between the first terminal device and the access network device is released, but the first terminal device and the access network device that last provided services to the first terminal device save the context of the first terminal device; the first terminal device is in an idle state, which means that the RRC connection between the first terminal device and the access network device is released, and the first terminal device and the access network device that last provided services to the first terminal device release the context of the first terminal device.

[0102] 520. The first terminal device sends a first message to the first radio access network device. The first message includes a first NAS signaling sent by the first terminal device to the core network device. The first NAS signaling is carried on one of at least one dedicated signaling radio bearer; for example, the first NAS signaling can be carried on SRB1, SRB2, SRB3, or other dedicated SRBs subsequently expanded. The first NAS signaling may include a positioning protocol message or a tracking area update message. It should be understood that the first radio access network device is the target base station, that is, the access network device that provides services for the cell where the first terminal device is currently residing, or the access network device that provides services for the cell where the first terminal device is currently serving. The positioning protocol message includes messages related to the positioning of the terminal device, such as positioning capability-related messages and positioning-related measurement result interaction-related messages. The tracking area update message is a tracking area update request message sent by the terminal device to the AMF after it moves out of the tracking area previously indicated to it by the AMF, so that the AMF can successfully page the terminal device.

[0103] Optionally, after the first terminal device restores at least one dedicated signaling radio bearer, a new key can be derived to encrypt the dedicated signaling radio bearer, and the dedicated signaling radio bearer used to carry the first NAS signaling is encrypted by the key.

[0104] Optionally, the first message also includes an RRC recovery request message, and the first terminal device sends the RRC recovery request message and the first NAS signaling to the first radio access network device. Specifically, the RRC recovery request message is carried in a public signaling radio bearer SRB0, and the first NAS signaling is carried in a dedicated signaling radio bearer, such as SRB1, SRB2, and SRB3. It should be understood that the first message may also be other RRC messages, which may include information such as the identifier of the first terminal device.

[0105] 530. The first radio access network device receives a first message sent by the first terminal device, where the first message includes a first NAS signaling sent by the first terminal device to the core network device.

[0106] At step 540, the first radio access network device sends a third message to the core network device based on the received first message, where the third message includes the first NAS signaling sent by the first terminal device to the core network device. The core network device may be an access and mobility management function (AMF) in a 5G communication system or an MME in an LTE communication system.

[0107] Specifically, optionally, if the first message received by the first wireless access network device includes an RRC recovery request message, the first wireless access network device sends a request message for obtaining the context of the first terminal device to the second wireless access network device to obtain the context of the first terminal device. After obtaining the context of the first terminal device, the first NAS signaling in the dedicated signaling radio bearer is decrypted, and a third message is sent to the core network device. The third message can be a path switching request message, and the third message carries the first NAS signaling. It should be understood that the second wireless access network device is the original service base station of the first terminal device, and can also be called an anchor base station.

[0108] 550. The core network device receives the third message sent by the first wireless access network device, and obtains the first NAS signaling sent by the first terminal device from the third message.

[0109] In the technical solution of the embodiment of the present application, the first terminal device in an inactive state can send uplink signaling to the core network device without entering a connected state, which can effectively improve the efficiency of signaling transmission and reduce the energy consumption of the first terminal device.

[0110] Optionally, after the core network device receives the first NAS signaling sent by the first terminal device, if there is a downlink signaling of the first terminal device, the core network device sends the downlink signaling to the first terminal device. Figure 6 As shown, a schematic flow chart of another signaling transmission method is presented.

[0111] 610. After the core network device receives the first NAS signaling sent by the first terminal device, if there is downlink signaling of the first terminal device, it sends a fourth message to the first radio access network device. The fourth message includes the second NAS signaling sent by the core network device to the first terminal device. The fourth message can be Figure 5 Specifically, the second NAS signaling may include a positioning protocol message or a tracking area update response message.

[0112] Specifically, optionally, if the third message is a path switch request message, the fourth message may be a path switch response message, and the path switch response message carries the second NAS signaling sent by the core network device to the first terminal device.

[0113] Specifically, optionally, the third message includes the identity information of the first terminal device, and other information in the initial terminal device message (INITIAL UE MESSAGE), such as the identifier of the public land mobile network selected by the terminal device, the ID of the AMF set, the reason value for link establishment, etc.

[0114] Optionally, the third message may be an initial UE message (INITIAL UE MESSAGE) and include an indication information indicating that the third message is not used to establish an interface from the first network access network device to the AMF for the terminal device.

[0115] 620. The first radio access network device receives a fourth message sent by the core network device.

[0116] 630, the first radio access network device sends a second message to the first terminal device according to the received fourth message, the second message including the second NAS signaling sent by the core network device to the first terminal device, the second message can be Figure 5 The response message to the first message in .

[0117] The second NAS signaling is carried on at least one dedicated signaling radio bearer, that is, the second NAS signaling can be carried on SRB1, SRB2, SRB3 or other dedicated SRBs subsequently expanded. If the first terminal device only restores one dedicated signaling radio bearer, the first NAS signaling and the second NAS signaling can only be carried on the same SRB; if the first terminal device restores two or more dedicated signaling radio bearers, the first NAS signaling and the second NAS signaling can be carried on the same SRB or on different SRBs.

[0118] Optionally, the second message includes a radio resource control (RRC) recovery message or a radio resource control (RRC) release message. The first radio access network device may send the radio resource control (RRC) recovery message and the second NAS signaling to the first terminal device together, or the first radio access network device may send the radio resource control (RRC) release message and the second NAS signaling to the first terminal device together. Specifically, the RRC recovery message and the RRC release message are carried on SRB1; the second NAS signaling is carried on SRB1 or SRB2, and may also be carried on SRB3 or other dedicated SRBs subsequently expanded.

[0119] 640. The first terminal device receives the second message sent by the first wireless access network device, and obtains the second NAS signaling sent by the core network device from the second message.

[0120] In the technical solution of the embodiment of the present application, the first terminal device in an inactive state can receive the downlink NAS signaling sent by the core network device without entering the connected state, which can effectively improve the efficiency of signaling transmission and reduce the energy consumption of the first terminal device.

[0121] It should be understood that if the core network device does not receive the first NAS signaling sent by the first terminal device, but if there is a downlink signaling from the first terminal device, it can also receive the downlink signaling from the first terminal device through Figure 6The specific process in sends the downlink signaling to the first terminal device.

[0122] In the above method, signaling is transmitted from the first access network device to the core network device. The embodiment of the present application proposes another signaling transmission method, which can transmit signaling to the core network device through the first access network device (target base station) and the second wireless access network device (original service base station). Figure 7 As shown, a schematic flow chart of another signaling transmission method is presented.

[0123] 710. The first terminal device is released from the connected state to the inactive state by the original serving base station (second wireless access network device). When the first terminal device needs to transmit uplink NAS signaling, at least one dedicated signaling radio bearer is restored according to the saved context, wherein the dedicated radio signaling bearer includes SRB1, SRB2, SRB3 or other dedicated SRBs subsequently expanded.

[0124] 720. A first terminal device sends a first message to a first radio access network device. The first message includes first NAS signaling sent by the first terminal device to a core network device. The first NAS signaling is carried on one of at least one dedicated signaling radio bearer. For example, the first NAS signaling can be carried on SRB1, SRB2, SRB3, or other dedicated SRBs subsequently expanded. The first NAS signaling can include a positioning protocol message or a tracking area update message. It should be understood that the first radio access network device is a target base station.

[0125] Optionally, after the first terminal device restores at least one dedicated signaling radio bearer, a new key can be derived to encrypt the dedicated signaling radio bearer, and the dedicated signaling radio bearer used to carry the first NAS signaling is encrypted by the key.

[0126] Optionally, the first message may be an RRC recovery request message, and the first terminal device sends the RRC recovery request message and the first NAS signaling to the first radio access network device. Specifically, the RRC recovery request message is carried in a public signaling radio bearer SRB0, and the first NAS signaling is carried in a dedicated signaling radio bearer, such as SRB1, SRB2, and SRB3.

[0127] 730. The first radio access network device receives a first message sent by the first terminal device, where the first message includes a first NAS signaling sent by the first terminal device to the core network device.

[0128] 740. The first radio access network device sends a third message to the second radio access network device based on the received first message. The third message includes the first NAS signaling sent by the first terminal device to the core network device. Optionally, the third message may include first indication information, where the first indication information is used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type. In other words, the first indication information is used to indicate that the NAS PDU included in the third message is NAS signaling.

[0129] Specifically, optionally, if the first message received by the first radio access network device is an RRC recovery request message, the third message sent by the first radio access network device to the second radio access network device may be a request message for obtaining a context, for obtaining the context of the first terminal device, and the request message for obtaining a context includes the first NAS signaling and the first indication information sent by the first terminal device to the core network device. It should be understood that the second radio access network device is the original serving base station of the first terminal device, and may also be referred to as an anchor base station.

[0130] 750. The second radio access network device receives a third message sent by the first radio access network device.

[0131] At 760, after receiving the third message, the second radio access network device decodes the NAS PDU included in the third message, obtains the first NAS signaling, and sends a fifth message to the core network device. The fifth message includes the first NAS signaling sent by the first terminal device to the core network device. Specifically, the fifth message may optionally be an uplink non-access stratum NAS transmission message. It should be understood that the third message may include other information that requires decoding to obtain the first NAS signaling.

[0132] 770. The core network device receives the fifth message sent by the second wireless access network device, and obtains the first NAS signaling sent by the first terminal device from the fifth message.

[0133] Optionally, after the core network device receives the first NAS signaling sent by the first terminal device, if there is a downlink signaling of the first terminal device, the core network device sends the downlink signaling to the first terminal device. Figure 8 As shown, a schematic flow chart of another signaling transmission method is presented.

[0134] 810. After the core network device receives the first NAS signaling sent by the first terminal device, if there is downlink signaling of the first terminal device, it sends a sixth message to the second radio access network device. The sixth message includes the second NAS signaling sent by the core network device to the first terminal device. The sixth message can be Figure 7The second NAS signaling may include a positioning protocol message or a tracking area update response message.

[0135] Specifically, optionally, if the fifth message can be an uplink non-access layer NAS transmission message, the sixth message can be a downlink non-access layer NAS transmission message, and the downlink non-access layer NAS transmission message carries the second NAS signaling sent by the core network device to the first terminal device.

[0136] 820. The second radio access network device receives a sixth message sent by the core network device.

[0137] 830. The second radio access network device sends a fourth message to the first radio access network device based on the received sixth message. The fourth message includes the second NAS signaling sent by the core network device to the first terminal device. Optionally, the fourth message may include second indication information, and the second indication information is used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type. In other words, the second indication information is used to indicate that the NAS PDU included in the fourth message is NAS signaling. The fourth message may be Figure 7 The response message to the third message.

[0138] If the third message is a request message for obtaining a context, the fourth message may be a response message for obtaining a context, and the response message for obtaining a context carries a second NAS signaling sent by the core network device to the first terminal device.

[0139] 840. The first radio access network device receives a fourth message sent by the second radio access network device.

[0140] 850, the first radio access network device sends a second message to the first terminal device according to the received fourth message, the second message including the second NAS signaling sent by the core network device to the first terminal device, the second message can be Figure 7 The response message to the first message in .

[0141] The second NAS signaling is carried on at least one dedicated signaling radio bearer, that is, the second NAS signaling can be carried on SRB1, SRB2, SRB3 or other dedicated SRBs subsequently expanded. If the first terminal device only restores one dedicated signaling radio bearer, the first NAS signaling and the second NAS signaling can only be carried on the same SRB; if the first terminal device restores two or more dedicated signaling radio bearers, the first NAS signaling and the second NAS signaling can be carried on the same SRB or on different SRBs.

[0142] Optionally, the second message may be a radio resource control (RRC) recovery message or a radio resource control (RRC) release message. The first radio access network device may send the radio resource control (RRC) recovery message and the second NAS signaling to the first terminal device together, or the first radio access network device may send the radio resource control (RRC) release message and the second NAS signaling to the first terminal device together. Specifically, the RRC recovery message and the RRC release message are carried on SRB1; the second NAS signaling is carried on SRB1 or SRB2, and may also be carried on SRB3 or other dedicated SRBs subsequently expanded.

[0143] 860. The first terminal device receives the second message sent by the first wireless access network device, and obtains the second NAS signaling sent by the core network device from the second message.

[0144] It should be understood that if the core network device does not receive the first NAS signaling sent by the first terminal device, but if there is a downlink signaling from the first terminal device, it can also receive the downlink signaling from the first terminal device through Figure 8 The specific process in sends the downlink signaling to the first terminal device.

[0145] In the above method, the first terminal device carries the NAS signaling in a dedicated SRB and sends it. The embodiment of the present application proposes another signaling transmission method, in which the first terminal device can carry the NAS signaling in a public SRB0 and send it. Figure 9 As shown, a schematic flow chart of another signaling transmission method is presented.

[0146] 910. When a first terminal device that is in an idle state or is released from a connected state to an inactive state by the original serving base station (second radio access network device) needs to transmit uplink NAS signaling, the first terminal device determines a seventh message, which includes the first non-access layer NAS signaling that the first terminal device needs to send to the core network device and third indication information, and the third indication information is used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type. Service data types include terminal device voice services, data transmission services, etc. In other words, the third indication information is used to indicate that the NAS PDU included in the seventh message is NAS signaling.

[0147] Optionally, the first NAS signaling may include a positioning protocol message, a tracking area update message, or other messages, which is not limited in this embodiment of the present application.

[0148] Optionally, the seventh message may be an RRC data early transmission request message, including the system architecture evolution temporary mobile user identity S-TMSI of the first terminal device, which is used to identify the first terminal device. The seventh message may also be an RRC recovery request message.

[0149] 920. The first terminal device sends a seventh message to the first radio access network device via the public signaling radio bearer. The first NAS signaling can be carried on SRB0, or on other public SRBs subsequently expanded. Optionally, the first terminal device can carry the first NAS signaling and the RRC data early transmission request message on SRB0 and send them to the first radio access network device, or can carry the first NAS signaling on SRB0 and the RRC recovery request message on SRB1 or SRB2 and send them to the first radio access network device.

[0150] 930. The first access wireless network device receives the seventh message sent by the first terminal device. The first wireless access network device can find the core network device corresponding to the first terminal device based on the S-TMSI of the first terminal device. The core network device can be an access and mobility management function (AMF).

[0151] 940. The first access wireless network device sends a ninth message to the core network device according to the received seventh message. The ninth message includes a first non-access layer NAS signaling sent by the first terminal device to the core network device.

[0152] Optionally, if the first terminal device is in an inactive state, the ninth message may be a newly created uplink message. The ninth message also includes an identifier of the first terminal device, which is used to inform the core network device that the first NAS signaling in the ninth message is sent by the first terminal device. The ninth message may be a newly created uplink message.

[0153] Optionally, if the first terminal device is in an idle state, the ninth message may be an initial message for establishing a next generation (NG) interface, and the initial message for establishing the NG interface may be sent to the core network device together with the first NAS signaling.

[0154] 950. The core network device receives the ninth message sent by the first wireless access network device, and obtains the first NAS signaling sent by the first terminal device from the ninth message.

[0155] Optionally, after the core network device receives the first NAS signaling sent by the first terminal device, if there is a downlink signaling of the first terminal device, the core network device sends the downlink signaling to the first terminal device. Figure 10 As shown, a schematic flow chart of another signaling transmission method is presented.

[0156] 1010. After receiving the first NAS signaling sent by the first terminal device, the core network device sends a tenth message to the first radio access network device if there is downlink signaling of the first terminal device. The tenth message includes the second NAS signaling sent by the core network device to the first terminal device. The tenth message can be Figure 9 The second NAS signaling may include a positioning protocol message or a tracking area update response message.

[0157] Specifically, optionally, if the first terminal device is in an idle state, the ninth message is an initial message for establishing an NG interface, and the tenth message can be a downlink non-access stratum generic transport message, which carries the second NAS signaling sent by the core network device to the first terminal device.

[0158] Specifically, optionally, if the first terminal device is in an inactive state, the tenth message also includes an identifier of the first terminal device, which is used to inform the first wireless access network device that the second NAS signaling in the tenth message is sent by the core network device to the first terminal device. The ninth message can be a newly created downlink message.

[0159] 1020. The first radio access network device receives the tenth message sent by the core network device.

[0160] 1030. The first radio access network device sends an eighth message to the first terminal device through the common signaling radio bearer according to the received tenth message. The eighth message includes the second NAS signaling sent by the core network device to the first terminal device and the fourth indication information. The fourth indication information is used to indicate that the second NAS signaling includes the signaling type in the signaling or service data type. In other words, the fourth indication information is used to indicate that the NAS PDU included in the eighth message is NAS signaling. The eighth message can be Figure 9 The response message of the seventh message.

[0161] If the seventh message is a data early transmission request message, the eighth message may be a data early transmission completion message. If the seventh message is an RRC recovery request message, the eighth message may be an RRC recovery message or an RRC release message.

[0162] The eighth message may be carried on SRB0, or may be carried on other public SRBs subsequently expanded. Optionally, the first radio access network device may carry the second NAS signaling and the RRC data early transmission completion message together on SRB0 and send them to the first terminal device, or may carry the second NAS signaling on SRB0 and the RRC recovery message or RRC release message on SRB1 and send them together to the first terminal device.

[0163] 1040. The first terminal device receives the eighth message sent by the first wireless access network device, and obtains the second NAS signaling sent by the core network device from the eighth message.

[0164] It should be understood that in the technical solution provided in the embodiment of the present application, the core network device can send a second NAS signaling to the first terminal device without receiving any signaling sent by the first terminal device, or can send a second NAS signaling to the first terminal device based on the first NAS signaling sent by the first terminal device. Similarly, the first terminal device can send a first NAS signaling to the core network device when it needs to send uplink signaling, or can send signaling to the core network device when it receives a second NAS signaling sent by the core network device. The embodiment of the present application does not impose any restrictions on this.

[0165] The present application embodiment provides a communication device 1100, which can be used in Figures 5 to 8 The first terminal device in the method embodiment may also be implemented Figures 5 to 8 The components of the method in the embodiment, for example, a chip. Figure 11 As shown, a schematic block diagram of a communication device 1100 according to an embodiment of the present application is shown.

[0166] The device 1100 includes: a processing unit 1110 and a transceiver unit 1120, the processing unit 1110 is used to restore at least one dedicated signaling radio bearer based on the saved context, and the first terminal device is in an inactive state; the transceiver unit 1120 is used to send a first message to the first radio access network device, the first message includes a first non-access layer NAS signaling sent by the first terminal device to the core network device, and the first NAS signaling is carried on one of the at least one dedicated signaling radio bearer.

[0167] Optionally, the transceiver unit 1120 is further used to receive a second message sent by the first wireless access network device, where the second message includes a second non-access stratum NAS signaling sent by the core network device to the first terminal device, and the second message is a response message to the first message.

[0168] Optionally, the first message includes a radio resource control RRC recovery request message.

[0169] Optionally, the second message includes a radio resource control RRC recovery message or a radio resource control RRC release message.

[0170] Optionally, the first NAS signaling includes a positioning protocol message or a tracking area update message, and the second NAS signaling includes a positioning protocol message or a tracking area update response message.

[0171] The present application embodiment proposes another communication device, which can be applied to Figures 5 to 8 The first wireless access network device in the method embodiment may also be implemented Figures 5 to 8 The component of the method in the embodiment, for example, is a chip. The apparatus includes: a transceiver unit, configured to receive a first message sent by a first terminal device, wherein the first message includes a first non-access stratum (NAS) signaling sent by the first terminal device to a core network device, wherein the first terminal device is in an inactive state;

[0172] The transceiver unit is further configured to send a third message, where the third message includes the first NAS signaling.

[0173] Optionally, the transceiver unit is also used to: receive a fourth message, the fourth message including a second non-access layer NAS signaling sent by the core network device to the first terminal device; send a second message to the first terminal device, the second message including the second NAS signaling, and the second message is a response message to the first message.

[0174] Optionally, the transceiver unit is specifically used to: send the third message to the core network device; and receive the fourth message sent by the core network device.

[0175] Optionally, the third message includes a path switching request message; and the fourth message includes a path switching response message.

[0176] Optionally, the transceiver unit is specifically used to: send the third message to the second radio access network device; and receive the fourth message sent by the second radio access network device.

[0177] Optionally, the third message includes a context acquisition request message and first indication information, wherein the first indication information is used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type; the fourth message includes a context acquisition response message and second indication information, wherein the second indication information is used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type.

[0178] The embodiment of the present application proposes another communication device which can be applied to Figure 7 or Figure 8 The second wireless access network device in the method embodiment may also be implemented Figure 7 or Figure 8 The component of the method in the embodiment, for example, a chip, includes: a transceiver unit configured to receive a third message sent by a first radio access network device, the third message including a first non-access stratum (NAS) signaling sent by a first terminal device to a core network device, wherein the first terminal device is in an inactive state; and to send a fifth message to the core network device, the fifth message including the first NAS signaling.

[0179] Optionally, the transceiver unit is also used to receive a sixth message sent by the core network device, the sixth message including a second non-access layer NAS signaling sent by the core network device to the first terminal device; and send a fourth message to the first wireless access network device, the fourth message including the second NAS signaling.

[0180] Optionally, the fifth message includes an uplink non-access stratum NAS transmission message; and the sixth message includes a downlink non-access stratum NAS transmission message.

[0181] The present application embodiment proposes another communication device, which can be applied to Figures 5 to 8 The core network device in the method embodiment may also be implemented Figures 5 to 8 The component of the method in the embodiment, such as a chip, includes: a transceiver unit, configured to receive a third message sent by a first radio access network device, wherein the third message includes a first non-access stratum (NAS) signaling sent by a first terminal device to the core network device, wherein the first terminal device is in an inactive state.

[0182] Optionally, the transceiver unit is further used to send a fourth message to the first radio access network device, where the fourth message includes a second non-access stratum NAS signaling sent by the core network device to the first terminal device.

[0183] Optionally, the third message includes a path switching request message; and the fourth message includes a path switching response message.

[0184] The present application embodiment proposes another communication device, which can be applied to Figures 5 to 8 The core network device in the method embodiment may also be implemented Figures 5 to 8 The component of the method in the embodiment, such as a chip, includes: a transceiver unit, configured to receive a fifth message sent by a second radio access network device, wherein the fifth message includes a first non-access stratum (NAS) signaling sent by a first terminal device to a core network device, wherein the first terminal device is in an inactive state.

[0185] Optionally, the transceiver unit is further used to send a sixth message to the second radio access network device, where the sixth message includes a second non-access stratum NAS signaling sent by the core network device to the first terminal device.

[0186] Optionally, the fifth message includes an uplink non-access stratum NAS transmission message; and the sixth message includes a downlink non-access stratum NAS transmission message.

[0187] This embodiment of the present application proposes another communication device 1200, such as Figure 12 As shown, a schematic block diagram of a communication device 1200 according to an embodiment of the present application is shown. The communication device can be applied to Figure 9 or Figure 10 The first terminal device in the method embodiment may also be implemented Figure 9 or Figure 10 The component of the method in the embodiment is, for example, a chip.

[0188] The apparatus 1200 includes: a determining unit 1210, configured to determine a seventh message, the seventh message including first non-access stratum (NAS) signaling and third indication information sent by the first terminal device to a core network device, the third indication information being used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type, wherein the first terminal device is in a non-connected state;

[0189] The transceiver unit 1220 is configured to send the seventh message to the first radio access network device through a common signaling radio bearer.

[0190] Optionally, the transceiver unit 1220 is also used to receive an eighth message sent by the first wireless access network device, where the eighth message includes a second non-access layer NAS signaling and fourth indication information sent by the core network device to the first terminal device, and the fourth indication information is used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type, and the eighth message is a response message to the seventh message.

[0191] Optionally, the seventh message includes a data early transmission request message; the eighth message includes a data early transmission completion message, wherein the data early transmission request message includes the identifier of the first terminal device.

[0192] Optionally, the first NAS signaling includes a positioning protocol message or a tracking area update message, and the second NAS signaling includes a positioning protocol message or a tracking area update response message.

[0193] The present application embodiment proposes another communication device, which can be applied to Figure 9 or Figure 10 The first wireless access network device in the method embodiment may also be implemented Figure 9 or Figure 10 The component of the method in the embodiment, for example, is a chip. The apparatus includes: a transceiver unit, configured to receive a seventh message sent by a first terminal device, the seventh message including a first non-access stratum (NAS) signaling and third indication information sent by the first terminal device to a core network device, the third indication information being used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type, wherein the first terminal device is in a non-connected state;

[0194] The transceiver unit is further configured to send a ninth message to the core network device, where the ninth message includes the first NAS signaling.

[0195] Optionally, the transceiver unit is also used to receive a tenth message sent by the core network device, the tenth message including the second non-access stratum NAS signaling sent by the core network device to the first terminal device; and send an eighth message to the first terminal device, the eighth message including the second non-access stratum NAS signaling sent by the core network device to the first terminal device and fourth indication information, the fourth indication information being used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type.

[0196] Optionally, the first terminal device is in an inactive state; the ninth message and the tenth message include an identifier of the first terminal device.

[0197] Optionally, the first terminal device is in an idle state; the ninth message includes an initial message for establishing a next generation NG interface; and the tenth message includes a downlink non-access layer general transmission message.

[0198] The present application embodiment proposes another communication device, which can be applied to Figure 9 or Figure 10 The core network device in the method embodiment may also be implemented Figure 9 or Figure 10 The component of the method in the embodiment, for example, a chip. The apparatus includes: a transceiver unit, configured to receive a ninth message sent by a first radio access network device, wherein the ninth message includes a first non-access stratum (NAS) signaling sent by a first terminal device to the core network device, wherein the first terminal device is in a non-connected state.

[0199] Optionally, the transceiver unit is further configured to send a tenth message to the first radio access network device, the tenth message including a second non-access layer NAS signaling sent by the core network device to the first terminal device, and the tenth message being a response message to the ninth message. Figure 13 As shown, Figure 13A schematic block diagram of a communication device 1300 according to an embodiment of the present application is shown. The communication device 1300 includes:

[0200] The processor 1310 and the transceiver 1320 are configured to receive computer codes or instructions and transmit them to the processor. The processor 1310 executes the computer codes or instructions to implement the method in the embodiment of the present application.

[0201] An embodiment of the present application provides a communications device, including a memory and a processor, wherein the memory is configured to store a computer program, and the processor is configured to execute the computer program stored in the memory, so that the communications device performs the method according to the embodiment of the present application. Optionally, the communications device may be a first terminal device, a first radio access network device, a second radio access network device, or a core network device according to the embodiment of the present application.

[0202] The processor described above may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-described method embodiment may be completed by hardware integrated logic circuits in the processor or by software instructions. The processor described above may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The methods, steps, and logic block diagrams disclosed in the embodiments of this application may be implemented or executed. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of this application may be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. The storage medium is located in a memory, and the processor reads the messages in the memory and, in conjunction with its hardware, completes the steps of the above-described method.

[0203] The aforementioned memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache memory. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DRRAM).

[0204] It should be understood that the above-mentioned memory can be integrated into the processor, or the above-mentioned processor and memory can be integrated on the same chip, or they can be on different chips and connected via interface coupling. The embodiment of the present application is not limited to this. The embodiment of the present application provides a communication chip, including a processor and a communication interface, and the processor is used to read instructions to execute the method in the embodiment of the present application.

[0205] The present application also provides a computer-readable storage medium storing a computer program for implementing the method in the above method embodiment. When the computer program is executed on a computer, the computer can implement the method in the above method embodiment.

[0206] In addition, the term "and / or" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship; the term "at least one" in this application can mean "one" and "two or more". For example, at least one of A, B and C can represent seven situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B and C exist at the same time.

[0207] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0208] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0209] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0210] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0211] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0212] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0213] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A signaling transmission method, characterized in that: include: The first terminal device recovers at least one dedicated signaling radio bearer according to the saved context, the first terminal device being in an inactive state; The first terminal device sends a first message to the first wireless access network device, where the first message includes a first non-access layer NAS signaling sent by the first terminal device to the core network device, and the first NAS signaling is carried on one of the at least one dedicated signaling radio bearer.

2. The method according to claim 1, characterized in that The method further comprises: The first terminal device receives a second message sent by the first wireless access network device, where the second message includes a second non-access layer NAS signaling sent by the core network device to the first terminal device, and the second message is a response message to the first message.

3. The method according to claim 1, characterized in that The first message includes a radio resource control (RRC) recovery request message.

4. The method according to claim 2, characterized in that The second message includes a radio resource control RRC resume message or a radio resource control RRC release message.

5. The method according to any one of claims 2 to 4, characterized in that The first NAS signaling includes a positioning protocol message or a tracking area update message, and the second NAS signaling includes a positioning protocol message or a tracking area update response message.

6. A signaling transmission method, characterized in that: include: The first radio access network device receives a first message sent by a first terminal device, where the first message includes a first non-access stratum (NAS) signaling sent by the first terminal device to a core network device, wherein the first terminal device is in an inactive state; The first radio access network device sends a third message, where the third message includes the first NAS signaling.

7. The method according to claim 6, characterized in that The method further comprises: The first radio access network device receives a fourth message, where the fourth message includes a second non-access stratum (NAS) signaling sent by the core network device to the first terminal device; The first radio access network device sends a second message to the first terminal device, where the second message includes the second NAS signaling, and the second message is a response message to the first message.

8. The method according to claim 7, characterized in that The first radio access network device sending the third message includes: the first radio access network device sending the third message to the core network device; The first radio access network device receiving the fourth message includes: the first radio access network device receiving the fourth message sent by the core network device.

9. The method according to claim 8, characterized in that The third message includes a path switch request message; The fourth message includes a path switch response message.

10. The method according to claim 7, characterized in that The first radio access network device sending the third message includes: the first radio access network device sending the third message to the second radio access network device; The first radio access network device receiving the fourth message includes: the first radio access network device receiving the fourth message sent by the second radio access network device.

11. The method according to claim 10, characterized in that The third message includes a context acquisition request message and first indication information, where the first indication information is used to indicate that the first NAS signaling includes a signaling type in a signaling or service data type; The fourth message includes a context acquisition response message and second indication information, where the second indication information is used to indicate that the second NAS signaling includes a signaling type in a signaling or service data type.

12. The method according to any one of claims 6 to 11, characterized in that The first NAS signaling is carried on one of the at least one dedicated signaling radio bearer, and the at least one dedicated signaling radio bearer is restored by the first terminal device according to the saved context.

13. A communication device, characterized in that: The method comprises means for implementing the functions of the method according to any one of claims 1 to 12.

14. A communication device, characterized in that: include: A processor and a transceiver, wherein the transceiver is configured to receive computer codes or instructions and transmit the computer codes or instructions to the processor, and the processor executes the computer codes or instructions, according to the method according to any one of claims 1 to 12.

15. A computer-readable storage medium, characterized in that include: The computer readable medium stores a computer program; When the computer program is run on a computer, the computer is caused to execute the method according to any one of claims 1 to 12.

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