WO2024114503A1

WO2024114503A1 - Data transmission method and apparatus

Info

Publication number: WO2024114503A1
Application number: PCT/CN2023/133646
Authority: WO
Inventors: 李芸; 胡渭琦
Original assignee: 上海大唐移动通信设备有限公司
Priority date: 2022-11-28
Filing date: 2023-11-23
Publication date: 2024-06-06
Also published as: CN118102235A

Abstract

Provided in the embodiments of the present disclosure are a data transmission method and apparatus. The method comprises: receiving a first message sent by a first network device, wherein the first message comprises a first identifier and a first transmission parameter, the first identifier being used for indicating a second message, which carries the first transmission parameter, and a sending occasion of the second message; and when it is determined to trigger a target process, sending the second message, which carries the first transmission parameter, to the second network device according to the sending occasion of the second message.

Description

Data transmission method and device

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure claims priority to Chinese patent application number 202211506428.4, filed on November 28, 2022, and entitled “Data Transmission Method and Device,” which is incorporated herein by reference in its entirety.

Technical Field

The present disclosure relates to the field of communication technology, and in particular to a data transmission method and device.

Background technique

The Protocol Data Unit (PDU) session provides data connectivity between the terminal device and the data network (DN). All data traffic of the terminal device is carried through the PDU session.

In the above-mentioned related technologies, the network function (NF) in the core network will send information carrying specific parameters to the terminal device. After receiving the information, the terminal device needs to have the ability to identify the specific parameters and also needs to know how to send the above-mentioned specific parameters to other devices in order to carry out the related processes initiated by the terminal device (such as the processes related to the above-mentioned PDU session).

In the above-mentioned related technologies, the terminal device needs to have the ability to identify specific parameters and also needs to know how to send specific parameters to other devices, which places high demands on the communication capabilities of the terminal device. Therefore, how to reduce the requirements on the communication capabilities of the terminal device during the relevant process has become a technical problem that needs to be solved urgently.

Summary of the invention

The embodiments of the present disclosure provide a data transmission method and apparatus, which are used to solve the defect of high requirements on the communication capability of terminal equipment in the prior art, and reduce the requirements on the communication capability of terminal equipment.

In a first aspect, an embodiment of the present disclosure provides a data transmission method, applied to a terminal device, comprising:

receiving a first message sent by a first network device, wherein the first message includes a first identifier and a first transmission parameter, wherein the first identifier is used to indicate a second message carrying the first transmission parameter and the first transmission parameter; Second, the timing of sending the message;

When it is determined to trigger the target process, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.

Optionally, the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.

Optionally, in the case of determining to trigger the target process, sending the second message carrying the first transmission parameter to the second network device according to the sending timing of the second message includes:

Searching a preset list for a second message carrying the first transmission parameter and a sending timing of the second message indicated by the first identifier, wherein the preset list includes a plurality of identifiers, and messages corresponding to each identifier and a sending timing of the message;

Optionally, the second message carrying the first transmission parameter includes any one or more of the following:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.

Optionally, the timing of sending the second message includes one or more of the following:

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.

Optionally, the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.

Optionally, the first transmission parameter includes one or more of the following:

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.

Optionally, the receiving a first message sent by the first network device includes:

Receiving a first message sent by a network device in a first distributed network node, wherein the first message includes a first identifier and target DNAI information;

In the case of determining to trigger the target process, sending a second message carrying the first transmission parameter to the second network device according to the sending timing of the second message, including:

In the case of determining that the PDU session establishment process is triggered, determining that the sending timing of the PDU session establishment request message indicated by the first identifier and the second message carrying the target DNAI information are the PDU session establishment request message;

According to the sending timing of the PDU session establishment request message, the PDU session establishment request message carrying the target DNAI information is sent to the network device in the second distributed network node.

Receive a first message sent by a base station, wherein the first message includes a first identifier, a DNN, and an S-NSSAI;

In the case of determining to trigger the PDU session establishment process or the PDU session release process, determine the The sending timing of the registration request message indicated by the first identifier and the second message carrying the DNN and S-NSSAI are the registration request message;

According to the sending timing of the registration request message, the registration request message carrying the DNN and the S-NSSAI is sent to a network device including an access and mobility management function AMF.

In a second aspect, the present disclosure provides a terminal device, including: a memory, a transceiver, and a processor;

The memory is used to store computer programs;

The transceiver is used to send and receive data under the control of the processor;

The processor is configured to read the computer program in the memory and perform the following operations:

receiving a first message sent by a first network device, where the first message includes a first identifier and a first transmission parameter, where the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message;

Optionally, the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.

Optionally, the processor is specifically configured to:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.

Optionally, the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.

Optionally, the processor is specifically configured to:

In the case of determining that the PDU session establishment process is triggered, determining that the sending timing of the PDU session establishment request message indicated by the first identifier and the second message carrying the target DNAI information is the PDU session establishment request message;

According to the sending timing of the PDU session establishment request message, The network device sends the PDU session establishment request message carrying the target DNAI information.

Optionally, the processor is specifically configured to:

In the case of determining that the PDU session establishment process or the PDU session release process is triggered, determining that the sending timing of the registration request message indicated by the first identifier and the second message carrying the DNN and the S-NSSAI are the registration request message;

In a third aspect, an embodiment of the present disclosure provides a data transmission device, applied to a terminal device, including:

a receiving module, configured to receive a first message sent by a first network device, wherein the first message includes a first identifier and a first transmission parameter, and the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message;

A sending module is used to send a second message carrying the first transmission parameter to a second network device according to a sending timing of the second message when determining that a target process is triggered.

Optionally, the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.

Optionally, the sending module is specifically used for:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.

Optionally, the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.

Optionally, the receiving module is specifically used for:

The sending module is specifically used for:

In the case of determining that the PDU session establishment process is triggered, determining the PDU indicated by the first identifier The timing of sending the session establishment request message and the second message carrying the target DNAI information are the PDU session establishment request message;

Optionally, the receiving module is specifically used for:

The sending module is specifically used for:

In a fourth aspect, the present disclosure further provides a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements any of the above-mentioned data transmission methods.

In a fifth aspect, the present disclosure further provides a computer program product, including a computer program, which implements any of the above-mentioned data transmission methods when executed by a processor.

In the data transmission method and apparatus provided in the embodiments of the present disclosure, the terminal device, based on indicating the second message carrying the first transmission parameter and the sending timing of the second message, sends the second message carrying the first transmission parameter to the second network device according to the sending timing of the second message when determining to trigger the target process. The terminal device is not required to have the ability to identify the first transmission parameter, nor is it required to have the ability to know how to send specific parameters to other devices based on the configuration of the terminal device or based on instructions to the terminal device, thereby reducing the requirements on the communication capability of the terminal device.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present disclosure, and it is obvious to ordinary technicians in this field that they can be easily understood without much effort. On the premise of creative work, other drawings can be obtained based on these drawings.

FIG1 is a schematic diagram of a data transmission method according to an embodiment of the present disclosure;

FIG2 is a second flow chart of the data transmission method provided by an embodiment of the present disclosure;

FIG3 is a third flow chart of the data transmission method provided by an embodiment of the present disclosure;

FIG4 is a fourth flow chart of the data transmission method provided by an embodiment of the present disclosure;

FIG5 is a fifth flow chart of a data transmission method provided by an embodiment of the present disclosure;

FIG6 is a schematic diagram of the structure of a terminal device provided in an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of the structure of a data transmission device provided in an embodiment of the present disclosure.

Detailed ways

The terminal device involved in the embodiments of the present disclosure may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the names of terminal devices may also be different. For example, in a 5G system, the terminal device may be called a user equipment (UE). A wireless terminal device may communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and/or data with a radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA) and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, and a user device, but is not limited to these in the embodiments of the present disclosure.

It can be understood that, in the embodiment of the present application, in one possible scenario, the network device may be a network entity or a network function entity; or, in another possible scenario, the network device may be a network entity or a network function entity. The entity or network function entity can be deployed on a network device to execute the method steps on the network device side, and can be specifically configured according to actual needs.

FIG1 is a flow chart of a data transmission method provided by an embodiment of the present disclosure. As shown in FIG1 , the method includes:

Step 101: Receive a first message sent by a first network device, where the first message includes a first identifier and a first transmission parameter, and the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message.

The execution subject of the data transmission method provided in the embodiment of the present disclosure may be a terminal device, or a data transmission apparatus provided on the terminal device. The data transmission apparatus may be implemented by a combination of software and/or hardware.

The first network device may be, for example, a device included in a network function (NF) (of a core network), or may be a base station. Here, the NF may be, for example, an access and mobility management function (AMF), a session management function (SMF), etc.

Optionally, the first transmission parameter may be in a visible state or an invisible state.

When the first transmission parameter is in an invisible state, the first transmission parameter is a black box for the terminal device, and the terminal device does not identify the first transmission parameter but only forwards the first transmission parameter.

When the first transmission parameter is in a visible state, the terminal device may use, for example, a decryption algorithm to identify the first transmission parameter.

Step 102: When it is determined that the target process is triggered, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.

The second network device may be, for example, a device including a NF. Here, the NF may also be an AMF, an SMF, etc.

In the case where the first network device is a device in the NF including the core network, the NF in the first network device may be, for example, AMF 1, and the NF in the second network device may be AMF 2.

In the data transmission method provided in the embodiment of FIG. 1, the terminal device indicates the second message carrying the first transmission parameter and the sending timing of the second message, and in the case of determining to trigger the target process, sends the second message carrying the first transmission parameter to the second network device according to the sending timing of the second message. The information does not require the terminal device to have the ability to identify the first transmission parameter, nor does it require the ability to know how to send specific parameters to other devices based on the configuration of the terminal device or based on instructions to the terminal device, thereby reducing the requirements on the communication capability of the terminal device.

Optionally, the target process is any of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.

Optionally, the target process may also be other processes actively triggered by the terminal device, such as a registration process of the terminal device, which will not be illustrated here.

The preset list may be a list configured by the terminal device and pre-stored in the terminal device. Optionally, the preset list may be a list agreed upon by a protocol, and thus, the protocol may be any protocol negotiated by the terminal device (UE) and the NF.

In the present disclosure, the terminal device queries a preset list based on the first identifier to obtain the sending timing of the second message carrying the first transmission parameter and the second message indicated by the first identifier. There is no need for the network side device to separately indicate the sending timing and the second message to the terminal, nor is there a need to carry the sending timing and the second message in the relevant messages, thereby reducing the transmission complexity between the network side device and the terminal device.

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access Stratum (NAS) message carried in the Registration Request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.

For example, when the sending timing of the second message includes the sending timing of the registration request message, the second message carrying the first transmission parameter includes the registration request message.

For example, when the sending timing of the second message includes the sending timing of the PDU session modification command message and the sending timing of the PDU session release request message, the second message carrying the first transmission parameter includes the PDU session modification command message and the PDU session release request message.

Optionally, the second message also includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.

The valid duration indicates that the first transmission parameter can successfully trigger the target process within the duration. For example, if the valid duration is 2 minutes, it means that the first transmission parameter can be used to trigger the target process within 2 minutes after receiving the first transmission parameter.

The effective time indicates the time when the first transmission parameter can be used to trigger the target process. For example, if the effective time is 1 minute and 53 seconds, at 0 minutes and 53 seconds, the first transmission parameter cannot be used to trigger the target process, and at 1 minute and 53 seconds, the first transmission parameter can be used to trigger the target process.

The effective times indicates the total number of times the target process is triggered. For example, if the effective times is 5, it means that The first transmission parameter can be used whenever a target process needs to be triggered.

Target Data Network Access Identifier (DNAI) information;

Data Network Name (DNN);

Single Network Slice Selection Assistance information (S-NSSAI).

For example, in a distributed network architecture scenario, the first transmission parameter may include target DNAI information.

For example, during the process of the SMF calling terminal establishing a PDU session, or during the process of the SMF calling terminal releasing a PDU session, the first transmission parameter may include DNN and S-NSSAI.

Optionally, the first transmission parameters may also include other parameters in addition to the above-mentioned target DNAI information, DNN, and S-NSSAI.

Correspondingly, in the case of determining to trigger the target process, sending the second message carrying the first transmission parameter to the second network device according to the sending timing of the second message includes:

Specifically, in the case of determining to trigger the PDU session establishment process, taking session and service continuity (SSC) mode 2 (mode 2) as an example, combined with Figure 2, the data transmission method provided by the present invention is explained in a distributed network architecture scenario.

FIG2 is a second flow chart of a data transmission method provided by an embodiment of the present disclosure. As shown in FIG2 , the method includes:

Step 201: SMF1 in a first distributed network node decides to change a user plane function (UPF).

Step 201a. If UPF (PSA) cannot connect to the data network indicated by the target DNAI information (target DNAI info) received from SMF1 from SM-PCF, SMF1 will call the SM context status notification request (Nsmf_PDUSession_SMContextStatusNotify Request) service operation to AMF1 in the first distributed network node.

SMF1 indicates whether SMF reselection is required.

Nsmf_PDUSession_SMContextStatusNotify Request carries the target DNAI information.

The target DNAI information is used for SMF selection, which can control the UPF connected to the DNAI to the same DNN and S-NSSAI when the next PDU session is established.

Since the target DNAI information is used for SMF selection, AMF stores the target DNAI information received from SMF.

The target DNAI info is not transmitted externally. For example, the protocol can support UE context transfer between AMFs to achieve AMF relocation.

Optionally, AMF may send a Nsmf_PDUSession_SMContextStatusNotify Response to SMF1.

Step 202: Execute the PDU session release process (with the original UPF, ie, UPF1).

Step 202a, AMF1 sends a PDU session release command (PDU Session Release Command) message (i.e., the first message) to the terminal device, and the PDU session release command message includes a first identifier and target DNAI information (first transmission parameter).

AMF1 is a NF in the first network device.

The PDU session release command message triggers the PDU session release process.

Step 203a, the terminal device finds in the preset list that the second message carrying the target DNAI information indicated by the first identifier is a PDU session establishment request message, and the timing of sending the second message is the timing of sending the PDU session establishment request message, and in the PDU session establishment process (with the new UPF), at the timing of sending the PDU session establishment request message, the terminal device sends the PDU session establishment request message to the AMF2 in the second distributed network node, and the PDU session establishment request message carries the target DNAI information.

Step 204: The terminal device and UPF2 perform uplink and downlink data transmission (UL/DL Data).

Next, in the case of determining the PDU session establishment process, taking SSC mode 3 as an example, in combination with FIG. 3 , the data transmission method provided by the present disclosure is explained in a distributed network architecture scenario.

FIG3 is a third flow chart of a data transmission method provided by an embodiment of the present disclosure. As shown in FIG3 , the method includes:

Step 301: SMF1 in the first distributed network node decides to change the UPF or SMF of the service.

Step 301a. If UPF (PSA) cannot connect to the data network indicated by the target DNAI information received by SMF1 from SM-PCF, SMF1 will call the SM context status notification request (i.e. Nsmf_PDUSession_SMContextStatusNotify Request (carrying target DNAI information)) service operation to AMF.

SMF indicates that SMF is expected to be selected.

If runtime coordination between 5GC and AF is enabled, SMF1 requests the SMContext ID in Nsmf_PDUSession_SMContextStatusNotify as a reference to the SMContext stored in SMF1 containing the AF coordination information.

Since the target DNAI information is used for SMF selection, the AMF stores the target DNAI information received from the SMF selection. The target DNAI information is not transmitted externally, for example, the protocol supports UE context transmission between AMFs to achieve AMF relocation.

Optionally, AMF can send an SM context status notification response (Nsmf_PDUSession_SMContextStatusNotify Response) to SMF1.

Step 302: If SMF1 has sent an early notification to AF and runtime coordination between 5GC and AF is enabled according to local configuration, SMF waits for a notification response from AF according to the indication of "expected AF confirmation" contained in the SMF event subscribed by AF.

If the SMF receives a negative notification response from the AF, the SMF may stop the procedure.

SMF calls N1N2 message transfer (Namf_Communication_N1N2MessageTransfer).

Namf_Communication_N1N2MessageTransfer carries: PDU session identifier (PDU Session ID), SMF reallocation request indication (SMF Reallocation requested indication), and N1SM container (container).

The N1SM container includes: PDU Session Modification Command.

The PDU Session Modification Command includes: Cause value, protocol configuration Options (PCO).

PDU Session ID indicates the existing PDU Session to be relocated.

Cause indicates that the PDU session needs to be re-established to the same data network (DN).

The SMF reallocation indication required by the network side indicates whether SMF reallocation is required.

The PDU session address lifetime value is passed to the UE upper layer in the PCO, indicating how long the network is willing to maintain the PDU session.

PCO includes the PDU Session Address Lifetime value.

SMF1 starts the PDU session release timer corresponding to the PDU session address lifetime value.

Step 303a, AMF1 sends a PDU session modification command message (ie, the first message) to the terminal device, and the PDU session modification command message includes the first identifier and target DNAI information (first transmission parameter).

AMF1 is a NF in the first network device.

Step 303b, the terminal device sends a PDU session modification command confirmation (PDU Session Modification Command ACK) to AMF1.

Step 303c, AMF1 forwards the N1SM container (PDU Session Modification Command ACK) (received from (R)AN1) to SMF1 through the PDU session update SM context request (Nsmf_PDUSession_UpdateSMContext Request) service operation.

Step 303d, SMF1 feeds back PDU session update SM context response (Nsmf_PDUSession_UpdateSMContext Response).

Step 304a, the terminal device finds in the preset list that the second message carrying the target DNAI information indicated by the first identifier is a PDU session establishment request message, and the timing of sending the second message is the timing of sending the PDU session establishment request message, and in the PDU session establishment process ((with UPF2 in the second distributed network node)), at the timing of sending the PDU session establishment request message, the terminal device sends a PDU session establishment request message to AMF2, and the PDU session establishment request message includes the target DNAI information.

Step 305: The terminal device and UPF2 perform uplink and downlink data transmission.

Step 306: The terminal device and UPF1 in the first distributed network node perform a PDU session release process.

In the distributed network architecture application scenario, PDU based on SSC mode2 or SSC mode3 In the session establishment process, the terminal device directly forwards the first transmission parameter, which can reduce the terminal device's requirements for identifying the indication information of the network function (NF) in the core network. The core network does not need to separately indicate to the terminal device the timing and conditions for using the first transmission parameter, thereby reducing the transmission of indication information between the terminal device and the core network and realizing direct interaction across distributed network nodes.

receiving a first message sent by a base station, wherein the first message includes a first identifier, a DNN, and an S-NSSAI; the base station is the first network device;

According to the timing of sending the registration request message, the registration request message carrying the DNN and the S-NSSAI is sent to a network device including an access and mobility management function AMF; the network device including the AMF is a second network device.

In the case of determining to trigger the PDU session establishment process, taking the calling terminal and the called terminal establishing a PDU session based on the same satellite (STA) and SMF calling terminal as an example, combined with Figure 4, the data transmission method provided by the present disclosure is explained.

FIG4 is a fourth flow chart of a data transmission method provided by an embodiment of the present disclosure. As shown in FIG4 , the method includes:

Step 401: The calling terminal (UE1) initiates a PDU session establishment process.

The PDU session establishment request message involved in the PDU session establishment process includes: the Generic Public Subscription Identifier (GPSI) of the called terminal (UE2), DNN, NSSAI, (if any) 5G virtual network group (Virtual Network Group, VN Group) message (info) and other parameters.

Step 402: SMF determines whether the called UE2 has a PDU session based on the UE2 GPSI carried by UE1. If not, SMF calls the Nudm_SDM_GET service operation to the UDM to retrieve the registration information of UE2. SMF starts the session establishment timer of the called UE2.

Step 403: SMF calls N1N2 information (Namf_Communication_N1N2MessageTransfer) to AMF.

The N1N2 information carries the subscription information, the first identifier and the first transmission parameter of UE2.

Step 404a, AMF determines that the called UE2 and the calling UE1 belong to the same SAT (that is, the same S-UPF) based on the contract information or location information of UE2 (if UE2 is in IDLE state, it is necessary to send a paging message to UE2 to obtain the location information of the called UE2), and performs downlink NAS transmission (Downlink NAS Transport) with the S-gNB.

During the downlink NAS transmission process, the carried cause instructs UE2 to establish a new PDU session. The PDU session establishment request message of UE2 carries the same parameters as the PDU session establishment request message of UE1 (for example, including a first identifier and a first transmission parameter, for example, the first transmission parameter includes DNN, S-NSSAI, 5G VN Group-related parameters, etc.).

Step 404b, the base station (S-gNB) in the SAT sends a registration request message (Request Message) (i.e., the first message) to UE2. The registration request message carries a NAS message and includes a first identifier, DNN, S-NSSAI, etc. (first transmission parameters).

Step 405a, UE2 finds in the preset list that the second message carrying DNN and S-NSSAI, etc. indicated by the first identifier is a PDU session establishment request message, and the second message is sent at the timing of sending the PDU session establishment request message. In the PDU session establishment process, UE2 sends a PDU session establishment request message to AMF at the timing of sending the PDU session establishment request message, and the PDU session establishment request message includes DNN and S-NSSAI, etc., and establishes a suitable matching forwarding rule at the S-UPF.

When UE2 receives T2T data from S-gNB, it forwards it to S-UPF. S-UPF detects that the destination address of the received data is UE2, then forwards it to S-gNB and forwards it to UE2 via wireless carrier.

Step 406a, AMF forwards the PDU session establishment completion response message received by S-gNB from UE2 to SMF through the PDU session update SM context request (Nsmf_PDUSession_UpdateSMContext Request) service operation. SMF completes the session establishment of the called UE2 and saves the PDU Session ID of UE2 in SMF.

Here, the SMF to which AMF sends the message is the SMF that triggers UE2 to initiate the PDU session establishment process It is the same SMF.

Step 406b, SMF sends a PDU session update SM context response (Nsmf_PDUSession_UpdateSMContext Response) to AMF, indicating that the establishment is complete, and eliminates the SMF timer.

Step 407: SMF calls N1N2 message transmission (Namf_Communication_N1N2MessageTransfer) to AMF, indicating that the PDU session establishment of UE2 is completed, and notifies UE1.

Step 408. AMF sends a PDU session resource setup request (PDU Session Resource setup request) message to the S-gNB. The PDU session resource setup request message carries a DL NAS transport (for example, PDU session establishment accept) message.

Step 409: S-gNB sends a DL NAS transport request message (DL NAS transportRequest Message) to UE1, informing UE1 that the UE2 session establishment is complete and UE1 and UE2 can conduct inter-satellite data communication.

In the case of determining to trigger the PDU session release process, taking the calling terminal and the called terminal releasing the PDU session based on different satellites (STA) and SMF calling terminals as an example, combined with Figure 5, the data transmission method provided by the present disclosure is explained.

FIG5 is a fifth flow chart of a data transmission method provided by an embodiment of the present disclosure. As shown in FIG5 , the method includes:

Step 501: The calling terminal initiates a PDU session release process.

The PDU session release request message involved in the PDU session release process carries UE2GPSI.

Step 502, SMF1 calls the Nudm_SDM_GET service operation to UDM to obtain the PDU Session ID of UE2 from UDM according to UE2GPSI.

Step 503, SMF1 calls N1N2 information (Namf_Communication_N1N2MessageTransfer) to AMF, carrying UE2’s PDU Session ID, first identifier, DNN and S-NSSAI (first transmission parameters).

Step 504a, AMF and S-gNB2 perform downlink NAS transmission (Downlink NAS Transport).

During the downlink NAS transmission, the NAS message is carried to inform UE2 to perform PDU The call is released and also carries the first identifier, DNN, S-NSSAI, etc. (first transmission parameters).

Step 504b, S-gNB2 sends a registration request message (Request Message) (i.e., the first message) to UE2. The registration request message carries a NAS message and includes a first identifier, DNN, and S-NSSAI, etc.

Optionally, the registration request message also includes other parameters involved in the prior art, which will not be described in detail here.

Step 505a, UE2 finds in the preset list that the second message carrying DNN and S-NSSAI, etc. indicated by the first identifier is a PDU session release request message, and the sending timing of the second message is the sending timing of the PDU session release request message. In the PDU session release process, UE2 sends a PDU session release request message to AMF at the sending timing of the PDU session release request message, and the PDU session release request message includes the first transmission parameters (DNN and S-NSSAI).

Optionally, step 505a may also include other steps, which will not be described in detail here. For details, please refer to the prior art.

Different from the prior art, in the prior art, the core network can indicate the use time and use conditions of the first transmission parameter of the terminal device through indication information, which increases the number of information transmissions between the terminal device and the core network, and increases the configuration and analysis of the use time and use conditions by the terminal device, which slows down the interaction between the terminal device and the core network. In the present disclosure, the terminal device can directly forward the first transmission parameter based on the sending condition indicated by the first identifier, and the first transmission parameter can be carried in a message agreed in a certain protocol, which reduces the number of information transmissions between the terminal device and the core network. Since the terminal device directly forwards the first transmission parameter, the configuration and analysis of the use time and use conditions by the terminal device is avoided, so that the terminal device can interact with the core network in a timely and fast manner.

In some embodiments, when the sending timing is a preset timing and the message of the first transmission parameter is a preset message, the terminal device can negotiate with the network side device or define a separate message system only for transmitting the first transmission parameter and the sending timing.

FIG6 is a schematic diagram of the structure of a terminal device provided by an embodiment of the present disclosure. As shown in FIG6 , the terminal device includes a memory 120 , a transceiver 100 and a processor 110 .

The memory 120 is used to store computer programs.

The transceiver 100 is used to send and receive data under the control of the processor 110.

The processor 110 is configured to read the computer program in the memory 120 and perform the following operations:

receiving a first message sent by a first network device, wherein the first message includes a first identifier and a first transmission parameter, and the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message;

The transceiver 100 is used to receive and send data under the control of the processor 110 .

In FIG6 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 110 and various circuits of memory represented by memory 120 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 100 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium may include a wireless channel, a wired channel, an optical cable, and other transmission media. For different user devices, the user interface 130 may also be an interface capable of externally connecting to required internal devices, and the connected devices include, but are not limited to, a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 110 is responsible for managing the bus architecture and general processing, and the memory 120 can store data used by the processor 110 when performing operations.

Optionally, processor 110 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (CPLD), and the processor can also adopt a multi-core architecture.

The processor calls the computer program stored in the memory to execute any of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions. The processor and the memory can also be arranged physically separately.

Optionally, the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.

Optionally, the processor is specifically configured to:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.

Optionally, the sending timing of the second elimination includes one or more of the following:

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.

Optionally, the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.

Optionally, the processor is specifically configured to:

It should be noted here that the above-mentioned terminal device provided in the embodiment of the present disclosure can implement all the method steps implemented by the method embodiment executed by the terminal device, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

FIG7 is a schematic diagram of the structure of a data transmission device provided in an embodiment of the present disclosure. The data transmission device is applied to a terminal device. As shown in FIG7 , the device includes:

The receiving module 210 is used to receive a first message sent by a first network device, wherein the first message includes a first identifier and a first transmission parameter, and the first identifier is used to indicate that the first transmission parameter is carried. a second message and a sending timing of the second message;

The sending module 220 is used to send a second message carrying the first transmission parameter to the second network device according to the sending timing of the second message when determining to trigger the target process.

Optionally, the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.

Optionally, the sending module 220 is specifically configured to:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.

Optionally, the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.

Optionally, the receiving module 210 is specifically configured to:

The sending module 220 is specifically used for:

Optionally, the receiving module 210 is specifically configured to:

The sending module 220 is specifically used for:

According to the timing of sending the registration request message, the access and mobility management function AMF is included The network device sends the registration request message carrying the DNN and the S-NSSAI.

It should be noted that the division of units in the embodiments of the present disclosure is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the prior art or all or 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, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

On the other hand, an embodiment of the present disclosure also provides a processor-readable storage medium, which stores a computer program, and the computer program is used to enable the processor to execute the methods provided by the above embodiments, including: receiving a first message sent by a first network device, the first message including a first identifier and a first transmission parameter, the first identifier being used to indicate a second message carrying the first transmission parameter and a sending timing of the second message; when determining to trigger the target process, sending a second message carrying the first transmission parameter to the second network device according to the sending timing of the second message.

The processor-readable storage medium may be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO)), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., Such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid state drive (SSD), etc.

On the other hand, the embodiments of the present disclosure also provide a computer program product, including a computer program, which implements the methods provided in the above embodiments when executed by a processor, including: receiving a first message sent by a first network device, the first message including a first identifier and a first transmission parameter, the first identifier being used to indicate a second message carrying the first transmission parameter and a sending timing of the second message; and when determining to trigger the target process, sending a second message carrying the first transmission parameter to the second network device according to the sending timing of the second message.

Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

The present disclosure is described with reference to the flowchart and/or block diagram of the method, device (system), and computer program product according to the embodiment of the present disclosure. It should be understood that each process and/or box in the flowchart and/or block diagram, as well as the combination of the process and/or box in the flowchart and/or block diagram can be implemented by computer executable instructions. These computer executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one process or multiple processes in the flowchart and/or one box or multiple boxes in the block diagram.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These processor executable instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the flowchart. The steps of a process or multiple processes and/or a block diagram specify functions in one or more blocks.

Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

A data transmission method, applied to a terminal device, comprising:

receiving a first message sent by a first network device, where the first message includes a first identifier and a first transmission parameter, where the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message;

When it is determined to trigger the target process, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.
The data transmission method according to claim 1, wherein the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.
The data transmission method according to claim 1, wherein, in the case of determining to trigger the target process, sending the second message carrying the first transmission parameter to the second network device according to the sending timing of the second message, comprises:

Searching a preset list for a second message carrying the first transmission parameter and a sending timing of the second message indicated by the first identifier, wherein the preset list includes a plurality of identifiers, and messages corresponding to each identifier and a sending timing of the message;

When it is determined to trigger the target process, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.
The data transmission method according to any one of claims 1 to 3, wherein the second message carrying the first transmission parameter includes any one or more of the following:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.
The data transmission method according to any one of claims 1 to 3, wherein the timing of sending the second message includes one or more of the following:

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.
The data transmission method according to any one of claims 1 to 3, wherein the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.
The data transmission method according to any one of claims 1 to 3, wherein the first transmission parameter includes one or more of the following:

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.
The data transmission method according to claim 1, wherein the receiving the first message sent by the first network device comprises:

Receiving a first message sent by a network device in a first distributed network node, wherein the first message includes a first identifier and target DNAI information;

In the case of determining to trigger the target process, sending a second message carrying the first transmission parameter to the second network device according to the sending timing of the second message, including:

In the case of determining that the PDU session establishment process is triggered, determining the PDU indicated by the first identifier The timing of sending the session establishment request message and the second message carrying the target DNAI information are the PDU session establishment request message;

According to the sending timing of the PDU session establishment request message, the PDU session establishment request message carrying the target DNAI information is sent to the network device in the second distributed network node.
The data transmission method according to claim 1, wherein the receiving the first message sent by the first network device comprises:

Receive a first message sent by a base station, wherein the first message includes a first identifier, a DNN, and an S-NSSAI;

In the case of determining to trigger the target process, sending a second message carrying the first transmission parameter to the second network device according to the sending timing of the second message, including:

In the case of determining that the PDU session establishment process or the PDU session release process is triggered, determining that the sending timing of the registration request message indicated by the first identifier and the second message carrying the DNN and the S-NSSAI are the registration request message;

According to the sending timing of the registration request message, the registration request message carrying the DNN and the S-NSSAI is sent to a network device including an access and mobility management function AMF.
A terminal device, comprising: a memory, a transceiver, and a processor;

The memory is used to store computer programs;

The transceiver is used to send and receive data under the control of the processor;

The processor is configured to read the computer program in the memory and perform the following operations:

receiving a first message sent by a first network device, where the first message includes a first identifier and a first transmission parameter, where the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message;

When it is determined to trigger the target process, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.
The terminal device according to claim 10, wherein the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.
The terminal device according to claim 10, wherein the processor is specifically configured to:

Searching a preset list for a second message carrying the first transmission parameter and a sending timing of the second message indicated by the first identifier, wherein the preset list includes a plurality of identifiers, and messages corresponding to each identifier and a sending timing of the message;

When it is determined to trigger the target process, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.
The terminal device according to any one of claims 10 to 12, wherein the second message carrying the first transmission parameter includes any one or more of the following:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.
The terminal device according to any one of claims 10 to 12, wherein the timing of sending the second message includes one or more of the following:

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.
The terminal device according to any one of claims 10 to 12, wherein the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.
The terminal device according to any one of claims 10 to 12, wherein the first transmission parameter includes one or more of the following:

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.
The terminal device according to claim 10, wherein the processor is specifically configured to:

Receiving a first message sent by a network device in a first distributed network node, wherein the first message includes a first identifier and target DNAI information;

In the case of determining that the PDU session establishment process is triggered, determining that the sending timing of the PDU session establishment request message indicated by the first identifier and the second message carrying the target DNAI information is the PDU session establishment request message;

According to the sending timing of the PDU session establishment request message, the PDU session establishment request message carrying the target DNAI information is sent to the network device in the second distributed network node.
The terminal device according to claim 10, wherein the processor is specifically configured to:

Receive a first message sent by a base station, wherein the first message includes a first identifier, a DNN, and an S-NSSAI;

In the case of determining that the PDU session establishment process or the PDU session release process is triggered, determining that the sending timing of the registration request message indicated by the first identifier and the second message carrying the DNN and the S-NSSAI are the registration request message;

According to the sending timing of the registration request message, the registration request message carrying the DNN and the S-NSSAI is sent to a network device including an access and mobility management function AMF.
A data transmission device, applied to a terminal device, comprising:

a receiving module, configured to receive a first message sent by a first network device, wherein the first message includes a first identifier and a first transmission parameter, and the first identifier is used to indicate a second message carrying the first transmission parameter and a sending timing of the second message;

A sending module is used to send a second message carrying the first transmission parameter to a second network device according to a sending timing of the second message when determining that a target process is triggered.
The data transmission device according to claim 19, wherein the target process is any one of the following:

Protocol Data Unit PDU session establishment process;

PDU session reestablishment process;

PDU session release process.
The data transmission device according to claim 19, wherein the sending module is specifically used for:

Searching a preset list for a second message carrying the first transmission parameter and a sending timing of the second message indicated by the first identifier, wherein the preset list includes a plurality of identifiers, and messages corresponding to each identifier and a sending timing of the message;

When it is determined to trigger the target process, a second message carrying the first transmission parameter is sent to the second network device according to the sending timing of the second message.
The data transmission device according to any one of claims 19 to 21, wherein the second message carrying the first transmission parameter includes any one or more of the following:

Registration request message;

PDU session establishment request message;

PDU session modification command message;

PDU session release request message;

Preset messages;

Non-access stratum NAS message carried in the registration request message;

NAS message carried in the PDU session establishment request message;

NAS message carried in the PDU Session Modification Command message;

NAS message carried by the PDU Session Release Command message.
The data transmission device according to any one of claims 19 to 21, wherein the timing of sending the second message includes one or more of the following:

The timing of sending the registration request message;

The timing of sending the PDU session establishment request message;

The timing of sending the PDU session modification command message;

The timing of sending the PDU session release request message;

Preset sending time;

When to send the PDU session release command message.
The data transmission device according to any one of claims 19 to 21, wherein the second message further includes one or more of the following:

The validity period of the first transmission parameter;

the effective time of the first transmission parameter;

The number of times the first transmission parameter is valid.
The data transmission device according to any one of claims 19 to 21, wherein the first transmission parameter comprises one or more of the following:

Target data network access identifier DNAI information;

Data network name DNN;

Single Network Slice Selection Assistance Information S-NSSAI.
The data transmission device according to claim 19, wherein the receiving module is specifically used for:

Receiving a first message sent by a network device in a first distributed network node, wherein the first message includes a first identifier and target DNAI information;

The sending module is specifically used for:

In the case of determining that the PDU session establishment process is triggered, determining that the sending timing of the PDU session establishment request message indicated by the first identifier and the second message carrying the target DNAI information is the PDU session establishment request message;

According to the sending timing of the PDU session establishment request message, the PDU session establishment request message carrying the target DNAI information is sent to the network device in the second distributed network node.
The data transmission device according to claim 19, wherein the receiving module is specifically used for:

Receive a first message sent by a base station, wherein the first message includes a first identifier, a DNN, and an S-NSSAI;

The sending module is specifically used for:

In the case of determining to trigger the PDU session establishment process or the PDU session release process, determine the The sending timing of the registration request message indicated by the first identifier and the second message carrying the DNN and S-NSSAI are the registration request message;

According to the sending timing of the registration request message, the registration request message carrying the DNN and the S-NSSAI is sent to a device including an access and mobility management function AMF.
A processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and when the computer program is executed by a processor, the data transmission method according to any one of claims 1 to 9 is implemented.