Patent Publication Number: US-2020305207-A1

Title: Data transmission method and device and computer storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of PCT Application No. PCT/CN2017/118346, filed Dec. 25, 2017, the entire content of which is incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to the technical field of wireless communication, and more particularly, to a data transmission method and device, and a computer storage medium. 
     BACKGROUND 
     In the 5th generation (5G) system, each terminal can establish one or more Protocol Data Unit (PDU) sessions, and each PDU session can include multiple Quality of Service flow (QoS flow), where the QoS flow is uniquely identified in the PDU session. As shown in  FIG. 1 , in a connection between an access network and a core network, a channel is allocated for each PDU session, which is called a PDU session channel. 
     In the related art, after the access network receives data sent by the terminal, it can identify which QoS flow the data belongs to, but cannot identify which PDU session the data belongs to, resulting in that the access network does not know which channel should the data to be submitted to. Similarly, when the terminal receives the data sent by the access network, it cannot identify which PDU session the data belongs to, which results in that the terminal does not know which IP entity should the data to be submitted to. 
     SUMMARY 
     To solve the above technical problems, embodiments of the present disclosure provide a data transmission method and device, and a computer storage medium. 
     The data transmission method provided by an embodiment of the present disclosure includes: 
     receiving, by a terminal, data sent by an access network element and determining a protocol data unit (PDU) session corresponding to the data; and 
     transmitting, by the terminal, the data to a protocol layer entity corresponding to the PDU session according to the PDU session corresponding to the data. 
     In the embodiment of the present disclosure, the receiving the data sent by the access network element and determining the PDU session corresponding to the data by the terminal includes: 
     when the terminal receives the data sent by the access network element, extracting association information of the PDU session from the data; and 
     determining, by the terminal, the PDU session corresponding to the data based on the association information of the PDU session; 
     wherein the association information of the PDU session comprises at least one of: 
     identification information of the PDU session, address information of the PDU session, and identification information of a quality of service (QoS) flow. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the PDU session; and 
     the determining, by the terminal, the PDU session corresponding to the data based on the association information of the PDU session includes: 
     determining, by the terminal, the PDU session corresponding to the data based on the identification information of the PDU session. 
     In the embodiment of the present disclosure, the association information of the PDU session is the address information of the PDU session; and 
     the determining, by the terminal, the PDU session corresponding to the data based on the association information of the PDU session includes: 
     determining, by the terminal, the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the QoS flow; and 
     the determining, by the terminal, the PDU session corresponding to the data based on the association information of the PDU session includes: 
     determining, by the terminal, the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the method further includes: 
     when establishing or modifying a PDU session, negotiating and configuring among the terminal, the access network element and a core network element the corresponding relationship between the address information of the PDU session and the PDU session. 
     In the embodiment of the present disclosure, the method further includes: 
     determining, by the terminal, the corresponding relationship between the address information of the PDU session and the PDU session based on a preset protocol. 
     In the embodiment of the present disclosure, the method further includes: 
     when establishing or modifying the PDU session, negotiating and configuring among the terminal, the access network element and the core network element: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the method further includes: 
     determining, by the terminal, the corresponding relationship between the identification information of the QoS flow and the PDU session based on a preset protocol:. 
     In the embodiment of the present disclosure, the negotiating and configuring the corresponding relationship among the terminal, the access network element and the core network element includes: 
     configuring the corresponding relationship and sending the configured corresponding relationship to the access network element and the core network element by the terminal; or 
     receiving, by the terminal, the corresponding relationship configured by the access network element or the core network element. 
     In the embodiment of the present disclosure, the transmitting the data to the protocol layer entity corresponding to the PDU session includes: 
     transmitting the data to an IP entity or an SMSF entity corresponding to the PDU session. 
     The data transmission method provided by an embodiment of the present disclosure includes: 
     receiving data sent by a terminal and determining a PDU session corresponding to the data by an access network element; and 
     according to the PDU session corresponding to the data, transmitting the data to a channel corresponding to the PDU session and transmitting the data to a core network element based on the channel by the access network element. 
     In the embodiment of the present disclosure, the receiving the data sent by the terminal and determining the PDU session corresponding to the data by the access network element includes: 
     when the access network element receives the data sent by the terminal, extracting association information of a PDU session from the data; and 
     determining, by the access network element, the PDU session corresponding to the data based on the association information of the PDU session; 
     wherein the association information of the PDU session comprises at least one of: 
     identification information of the PDU session, address information of the PDU session, and identification information of a QoS flow. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the PDU session; and 
     the determining, by the access network element, the PDU session corresponding to the data based on the association information of the PDU session includes: 
     determining, by the access network element, the PDU session corresponding to the data based on the identification information of the PDU session. 
     In the embodiment of the present disclosure, the association information of the PDU session is the address information of the PDU session; and 
     the determining, by the access network element, the PDU session corresponding to the data based on the association information of the PDU session includes: 
     determining, by the access network element, the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session; or 
     determining, by the access network element, the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and a PDU session channel, wherein the PDU session channel and the PDU session are in a one-to-one correspondence. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the QoS flow; and 
     the determining, by the access network element, the PDU session corresponding to the data based on the association information of the PDU session includes: 
     determining, by the access network element, the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the method further includes: 
     when establishing or modifying a PDU session, negotiating and configuring at least one of following corresponding relationships among the access network element, the terminal and the core network element: 
     a corresponding relationship between the address information of the PDU session and the PDU session, and a corresponding relationship between the address information of the PDU session and the PDU session channel. 
     In the embodiment of the present disclosure, the method further includes: 
     determining, by the access network element, at least one of following corresponding relationships based on a preset protocol: 
     a corresponding relationship between the address information of the PDU session and the PDU session, and a corresponding relationship between the address information of the PDU session and the PDU session channel. 
     In the embodiment of the present disclosure, the method further includes: 
     when establishing or modifying a PDU session, negotiating and configuring among the access network element, the terminal and the core network element: a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the method further includes: 
     determining, by the access network element, a corresponding relationship between the identification information of the QoS flow and the PDU session based on a preset protocol. 
     In the embodiment of the present disclosure, the negotiating and configuring the corresponding relationship among the access network element, the terminal and the core network element includes: 
     sending the configured corresponding relationship to the terminal and the core network element by the access network element; or 
     receiving, by the access network element, the corresponding relationship configured by the terminal or the core network element. 
     The data transmission device provided by an embodiment of the present disclosure includes: 
     a receiving unit, configured to receive data sent by an access network element; 
     a determining unit, configured to determine a PDU session corresponding to the data; and 
     a transmission unit, configured to transmit the data to a protocol layer entity corresponding to the PDU session according to the PDU session corresponding to the data. 
     In the embodiment of the present disclosure, the determining unit is configured to extract association information of the PDU session from the data; and determine a PDU session corresponding to the data based on the association information of the PDU session; and wherein the association information of the PDU session includes at least one of: 
     identification information of the PDU session, address information of the PDU session, and identification information of a QoS flow. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the PDU session; and 
     the determining unit is configured to determine the PDU session corresponding to the data based on the identification information of the PDU session. 
     In the embodiment of the present disclosure, the association information of the PDU session is the address information of the PDU session; and 
     the determining unit is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the QoS flow; and 
     the determining unit is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the device further includes: 
     a negotiation unit, configured to, when establishing or modifying a PDU session, negotiate and configure with an access network element and a core network element: the corresponding relationship between the address information of the PDU session and the PDU session. 
     In the embodiment of the present disclosure, the determining unit is further configured to determine the corresponding relationship between the address information of the PDU session and the PDU session based on a preset protocol. 
     In the embodiment of the present disclosure, the device further includes: 
     a negotiation unit, configured to, when establishing or modifying a PDU session, negotiate and configure with an access network element and a core network element: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the determining unit is further configured to determine the corresponding relationship between the identification information of the QoS flow and the PDU session based on a preset protocol. 
     In the embodiment of the present disclosure, the negotiation unit is configured to send the configured corresponding relationship to the access network element and the core network element; or receive the corresponding relationship configured by the access network element or the core network element. 
     In the embodiment of the present disclosure, the transmission unit is configured to transmit the data to an IP entity or an SMSF entity corresponding to the PDU session. 
     The data transmission device provided by an embodiment of the present disclosure includes: 
     a receiving unit, configured to receive data sent by a terminal; 
     a determining unit, configured to determine a PDU session corresponding to the data; and 
     a transmission unit, configured to according to the PDU session corresponding to the data, transmit the data to a channel corresponding to the PDU session, and transmit the data to a core network element based on the channel. 
     In the embodiment of the present disclosure, the determining unit is configured to extract association information of the PDU session from the data; and determine a PDU session corresponding to the data based on the association information of the PDU session; and wherein the association information of the PDU session comprises at least one of: 
     identification information of the PDU session, address information of the PDU session, and identification information of the QoS flow. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the PDU session; and 
     the determining unit is configured to determine the PDU session corresponding to the data based on the identification information of the PDU session. 
     In the embodiment of the present disclosure, the association information of the PDU session is the address information of the PDU session; and 
     the determining unit is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session, or determine the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and a PDU session channel, wherein the PDU session channel and the PDU session are in a one-to-one correspondence. 
     In the embodiment of the present disclosure, the association information of the PDU session is the identification information of the QoS flow; and 
     the determining unit is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the device further includes: 
     a negotiation unit, configured to, when establishing or modifying a PDU session, negotiate and configure at least one of following corresponding relationships with the terminal and the core network element: 
     a corresponding relationship between the address information of the PDU session and the PDU session, and a corresponding relationship between the address information of the PDU session and the PDU session channel. 
     In the embodiment of the present disclosure, the determining unit is further configured to determine at least one of following corresponding relationships based on a preset protocol: 
     a corresponding relationship between the address information of the PDU session and the PDU session, and a corresponding relationship between the address information of the PDU session and the PDU session channel. 
     In the embodiment of the present disclosure, the device further includes: 
     a negotiation unit, configured to, when establishing or modifying the PDU session, negotiate and configure with the terminal and the core network element: a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the embodiment of the present disclosure, the determining unit is further configured to determine a corresponding relationship between the identification information of the QoS flow and the PDU session based on a preset protocol. 
     In the embodiment of the present disclosure, the negotiation unit is configured to send the configured corresponding relationship to the terminal and the core network element; or receive the corresponding relationship configured by the terminal or the core network element. 
     The computer storage medium provided in the embodiment of the present disclosure stores computer-executable instructions, and the computer-executable instructions implement the foregoing data transmission method when executed by a processor. 
     In the technical solution of the embodiment of the present disclosure, the terminal receives data sent by the access network element, and determines a PDU session corresponding to the data; and the terminal transmits the data to a protocol layer entity corresponding to the PDU session according to the PDU session corresponding to the data. Similarly, the access network element receives the data sent by the terminal and determines the PDU session corresponding to the data; the access network element transmits the data to a channel corresponding to the PDU session according to the PDU session corresponding to the data, and transmits the data to a core network element based on the channel. With the technical solution of the embodiment of the present disclosure, a data receiving end (such as the terminal or the access network element) can correctly deliver the received data to the IP entity or channel corresponding to the PDU session, thereby ensuring smooth data transmission. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings described here are used to provide a further understanding of the present disclosure and constitute a part of the present application. The schematic embodiments of the present disclosure and the descriptions thereof are used to explain the present disclosure, and do not constitute an improper limitation on the present disclosure. In the drawings: 
         FIG. 1  is a schematic diagram of a PDU session channel; 
         FIG. 2  is a system architecture diagram of a 5G network according to an embodiment of the present disclosure; 
         FIG. 3  is a first schematic flowchart of a data transmission method according to an embodiment of the present disclosure; 
         FIG. 4  is a second schematic flowchart of a data transmission method according to an embodiment of the present disclosure; 
         FIG. 5  is a structural composition diagram of a data transmission device according to an embodiment of the present disclosure; and 
         FIG. 6  is a structural composition diagram of a computer device according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In order to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference only and are not intended to limit the embodiments of the present disclosure. 
       FIG. 2  is a system architecture diagram of a 5G network according to an embodiment of the present disclosure. As shown in  FIG. 2 , the equipment involved in the 5G network system includes: 
     User Equipment (UE), Radio Access Network (RAN), User Plane Function (UPF), Data Network (DN), Receive Core Access and Mobility Management Function (AMF), Session Management Function (SMF), Policy Control Function (PCF), Application Function (AF), Authentication Server Function (AUSF), and Unified data management (UDM). 
     In the 5G system, each UE can establish one or more PDU sessions, and each PDU session can include multiple QoS flows. 
     The above  FIG. 2  is only an example of a network architecture for implementing the embodiment of the present disclosure, and the embodiment of the present disclosure is not limited to the network structure described in  FIG. 2 . 
       FIG. 3  is a first flowchart of a data transmission method according to an embodiment of the present disclosure. As shown in  FIG. 3 , the data transmission method includes the following steps. 
     In step  301 : the terminal receives data sent by an access network element, and determines a PDU session corresponding to the data. 
     In the embodiment of the present disclosure, the terminal may be any device that can communicate with the network, such as a mobile phone, a tablet computer, a notebook computer, and a desktop computer. 
     In the embodiment of the present disclosure, when downlink data is sent by the access network element to the terminal, the data carries association information of the PDU session. Here, the association information of the PDU session includes at least one of the following: identification information of the PDU session, address information of the PDU session and identification information of the QoS flow. 
     Based on this, when the terminal receives the data sent by the access network element, the terminal extracts the association information of the PDU session from the data; and the terminal determines the PDU session corresponding to the data based on the association information of the PDU session. 
     The following describes how to determine the PDU session corresponding to the data in combination with different implementations of the association information of the PDU session. 
     1) The association information of the PDU session is the identification information of the PDU session. 
     When the terminal receives data sent by the access network element, the terminal determines the PDU session corresponding to the data based on the identification information of the PDU session. 
     2) The association information of the PDU session is the address information of the PDU session. 
     When the terminal receives the data sent by the access network element, the terminal determines the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session. 
     For example, the terminal receives an IP data packet sent by the access network element, determines the corresponding PDU session according to the address information in the IP data packet, and then submits the IP data packet to a corresponding high layer entity (such as an IP entity). 
     3) The association information of the PDU session is the identification information of the QoS flow. 
     When the terminal receives the data sent by the access network element, the terminal determines the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the above solutions, the corresponding relationship between the address information of the PDU session and the PDU session involved in 2) can be determined in the following manners. 
     In a first manner (negotiation and configuration): when establishing or modifying a PDU session, the terminal, the access network element, and a core network element negotiate and configure a following corresponding relationship: the corresponding relationship between the address information of the PDU session and the PDU session. 
     Here, the specific process of negotiation and configuration may be: 1) the terminal configures the corresponding relationship, and sends the configured corresponding relationship to the access network element and the core network element; or, 2) the terminal receives the corresponding relationship configured by the access network element or the core network element. 
     In a second manner (agreement in a protocol): the terminal determines a following corresponding relationship based on a preset protocol: the corresponding relationship between the address information of the PDU session and the PDU session. 
     Similarly, in the above solutions, the corresponding relationship between the QoS flow identification information and the PDU session involved in 3) can be determined in the following manners. 
     In a first manner (negotiation and configuration): when establishing or modifying a PDU session, the terminal, the access network element, and the core network element negotiate and configure a following corresponding relationship: the corresponding relationship between the QoS flow identification information and the PDU session. 
     Here, the specific process of negotiation and configuration may be: 1) the terminal configures the corresponding relationship, and sends the configured corresponding relationship to the access network element and the core network element; or, 2) the terminal receives the corresponding relationship configured by the access network element or the core network element. 
     In a second manner (agreement in the protocol): the terminal determines a following corresponding relationship based on a preset protocol: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In step  302 : the terminal transmits the data to a protocol layer entity corresponding to the PDU session according to the PDU session corresponding to the data. 
     Here, after the terminal determines the PDU session corresponding to the data, the terminal transmits the data to the protocol layer entity corresponding to the PDU session. Here, the protocol layer entity is a high layer entity (as opposed to a low layer entity for receiving data), such as an IP entity or a SMSF entity. 
       FIG. 4  is a second flowchart of a data transmission method according to an embodiment of the present disclosure. As shown in  FIG. 4 , the data transmission method includes the following steps. 
     In step  401 : the access network element receives data sent by the terminal, and determines a PDU session corresponding to the data. 
     In the embodiment of the present disclosure, when the terminal sends uplink data to the access network element, the data carries the association information of the PDU session. Here, the association information of the PDU session includes at least one of the following: identification information of the PDU session, address information of the PDU session and identification information of the QoS flow. 
     Based on this, when the access network element receives data sent by the terminal, the access network element extracts the association information of the PDU session from the data; and the access network element determines the PDU session corresponding to the data based on the association information of the PDU session. 
     The following describes how to determine the PDU session corresponding to the data in combination with different implementations of the association information of the PDU session. 
     1) The association information of the PDU session is the identification information of the PDU session. 
     When the access network element receives the data sent by the terminal, the access network element determines the PDU session corresponding to the data based on the identification information of the PDU session. 
     2) The association information of the PDU session is the address information of the PDU session. 
     When the access network element receives the data sent by the terminal, the access network element determines the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session; or, the access network element determines the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session channel, where the PDU session channel corresponds to the PDU session one-to-one. 
     For example, the access network element receives an IP data packet sent by the terminal, and determines the corresponding PDU session or PDU session channel according to the address information in the IP data packet, and then submits the IP data packet to the corresponding channel. 
     3) The association information of the PDU session is the identification information of the QoS flow. 
     When the access network element receives data sent by the terminal, the access network element determines a PDU session corresponding to the data based on the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In the above solutions, the corresponding relationship between the address information of the PDU session and the PDU session and the corresponding relationship between the address information of the PDU session and the PDU session channel involved in 2) can be determined in the following manners. 
     In a first manner (negotiation and configuration): when establishing or modifying a PDU session, the access network element, the terminal and the core network element negotiate and configure at least one of the following corresponding relationships: the corresponding relationship between the address information of the PDU session and the PDU session, and the corresponding relationship between the address information of the PDU session and the PDU session channel. 
     Here, the specific process of negotiation and configuration may be: 1) the access network element configures the corresponding relationship, and sends the configured corresponding relationship to the terminal and the core network element; or, 2) the access network access element receives the corresponding relationship configured by the terminal or the core network element. 
     In a second manner (agreement in the protocol): the access network element determines at least one of the following corresponding relationships based on a preset protocol: the corresponding relationship between the address information of the PDU session and the PDU session, and the corresponding relationship between the address information of the PDU session and the PDU session channel. 
     Similarly, in the above solutions, the corresponding relationship between the identification information of the QoS flow and the PDU session involved in 3) can be determined in the following manners. 
     In a first manner (negotiation and configuration): when establishing or modifying a PDU session, the access network element, the terminal and the core network element negotiate and configure a following corresponding relationship: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     Here, the specific process of negotiation and configuration may be: 1) the access network element configures the corresponding relationship, and sends the configured corresponding relationship to the terminal and the core network element; or, 2) the access network element receives the corresponding relationship configured by the terminal or the core network element. 
     In a second manner (agreement in the protocol): the access network element determines the following corresponding relationship based on a preset protocol: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In step  402 : the access network element transmits the data to a channel corresponding to the PDU session according to the PDU session corresponding to the data, and transmits the data to the core network element based on the channel. 
     Here, after the access network element determines a PDU session corresponding to the data, the data is transmitted to the channel corresponding to the PDU session. 
       FIG. 5  is a structural composition diagram of a data transmission device according to an embodiment of the present disclosure. The data transmission device in this embodiment may be provided in a terminal or in an access network element at a network side. The following describes the data transmission device in the terminal and the data transmission device in the access network element. 
     1) The data transmission device in the terminal includes: 
     a receiving unit  501 , configured to receive data sent by an access network element; 
     a determining unit  502 , configured to determine a PDU session corresponding to the data; and 
     a transmission unit  503 , configured to transmit the data to a protocol layer entity corresponding to the PDU session according to the PDU session corresponding to the data. 
     In an implementation manner, the determining unit  502  is configured to extract association information of the PDU session from the data; and determine the PDU session corresponding to the data based on the association information of the PDU session; where the association information of the PDU session includes at least one of the following: 
     identification information of the PDU session, address information of the PDU session, and identification information of QoS flow. 
     In an implementation manner, the association information of the PDU session is the identification information of the PDU session; 
     the determining unit  502  is configured to determine the PDU session corresponding to the data based on the identification information of the PDU session. 
     In an implementation manner, the association information of the PDU session is the address information of the PDU session; 
     the determining unit  502  is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session. 
     In an implementation manner, the association information of the PDU session is the identification information of the QoS flow; 
     the determining unit  502  is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In an implementation manner, the device further includes: 
     a negotiation unit  504 , configured to, when establishing or modifying a PDU session, negotiate and configure a corresponding relationship with the access network element and a core network element: the corresponding relationship between the address information of the PDU session and the PDU session. 
     In an implementation manner, the determining unit  502  is further configured to determine the following corresponding relationship based on a preset protocol: the corresponding relationship between the address information of the PDU session and the PDU session. 
     In an implementation manner, the device further includes: 
     a negotiation unit  504 , configured to, when establishing or modifying a PDU session, negotiate and configure with the access network element and the core network element, a following corresponding relationship: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In an implementation manner, the determining unit  502  is further configured to determine a following corresponding relationship based on a preset protocol: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In an implementation manner, the negotiation unit  504  is configured to configure the corresponding relationship, and send the configured corresponding relationship to the access network element and the core network element; or, receive the corresponding relationship configured by the network element or the core network element. 
     In the above solutions, the transmission unit  503  is configured to transmit the data to an IP entity or an SMSF entity corresponding to the PDU session. 
     2) The data transmission device in the access network element includes: 
     a receiving unit  501 , configured to receive data sent by a terminal; 
     a determining unit  502 , configured to determine a PDU session corresponding to the data; and 
     a transmission unit  503 , configured to transmit the data to a channel corresponding to the PDU session according to the PDU session corresponding to the data, and transmit the data to a core network element based on the channel. 
     In an implementation manner, the determining unit  502  is configured to extract association information of the PDU session from the data; and determine the PDU session corresponding to the data based on the association information of the PDU session; where the association information of the PDU session includes at least one of the following: 
     identification information of the PDU session, address information of the PDU session, and identification information of a QoS flow. 
     In an implementation manner, the association information of the PDU session is the identification information of the PDU session; 
     the determining unit  502  is configured to determine the PDU session corresponding to the data based on the identification information of the PDU session. 
     In an implementation manner, the association information of the PDU session is the address information of the PDU session; 
     the determining unit  502  is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and the PDU session; or, determine the PDU session corresponding to the data based on a corresponding relationship between the address information of the PDU session and a PDU session channel, where the PDU session channel corresponds to the PDU session one by one. 
     In an implementation manner, the association information of the PDU session is the identification information of a QoS flow; 
     the determining unit  502  is configured to determine the PDU session corresponding to the data based on a corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In an implementation manner, the device further includes: 
     a negotiation unit  504 , configured to, when establishing or modifying a PDU session, negotiate and configure at least one of the following corresponding relationships with the terminal and a core network element: 
     the corresponding relationship between the address information of the PDU session and the PDU session, and the corresponding relationship between the address information of the PDU session and the PDU session channel. 
     In an implementation manner, the determining unit  502  is further configured to determine at least one of the following corresponding relationships based on a preset protocol: 
     the corresponding relationship between the address information of the PDU session and the PDU session, and the corresponding relationship between the address information of the PDU session and the PDU session channel. 
     In an implementation manner, the device further includes: 
     a negotiation unit  504 , configured to, when the PDU session is established or modified, negotiate and configure with the terminal and the core network element the following corresponding relationship: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In an implementation manner, the determining unit  502  is further configured to determine the following corresponding relationship based on a preset protocol: the corresponding relationship between the identification information of the QoS flow and the PDU session. 
     In an implementation manner, the negotiation unit  504  is configured to configure the corresponding relationship, and send the configured corresponding relationship to the terminal and the core network element; or, receive the corresponding relationship configured by the terminal or the core network element. 
     Those skilled in the art should understand that the implementation functions of the units in the data transmission device shown in  FIG. 5  can be understood by referring to the related description of the foregoing data transmission method. The functions of the units in the data transmission device shown in  FIG. 5  may be implemented by a program running on a processor, or may be implemented by a specific logic circuit. 
     If the data transmission device in the embodiments of the present disclosure is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on such an understanding, the part of the technical solutions of the embodiments of the present disclosure that is essential or contributes to the related art can be embodied in the form of software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the methods described in the embodiments of the present disclosure. The above storage medium includes various media that can store program codes, such as a U disk, a mobile hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. In this way, the embodiments of the present disclosure are not limited to any specific combination of hardware and software. 
     Correspondingly, an embodiment of the present disclosure further provides a computer storage medium in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, the foregoing data transmission method of the embodiment of the present disclosure is implemented. 
       FIG. 6  is a structural composition diagram of a computer device according to an embodiment of the present disclosure. The computer device according to the embodiment of the present disclosure may be a terminal or a network device (such as an access network element). As shown in  FIG. 6 , the computer device  100  may include one or more (only one shown in the figure) processors  1002  (the processor  1002  may include, but is not limited to, a microprocessor (MCU, Micro Controller Unit) or a programmable logic device (FPGA, Field Programmable Gate Array), and other processing device), a memory  1004  for storing data, and a transmission device  1006  for a communication function. The person skilled in the art can understand that the structure shown in  FIG. 6  is only schematic, and it does not limit the structure of the above electronic device. For example, the computer device  100  may also include more or fewer components than those shown in  FIG. 6  or have a different configuration from that shown in  FIG. 6 . 
     The memory  1004  may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the data transmission method in the embodiment of the present disclosure. The processor  1002  executes various software programs and modules stored in the memory  1004  to execute various function applications and data processing, that is, to implement the above method. The memory  1004  may include a high-speed random access memory, and may further include a non-volatile memory, such as one or more magnetic storage devices, a flash memory, or other non-volatile solid-state memory. In some examples, the memory  1004  may further include memories remotely set with respect to the processor  1002 , and these remote memories may be connected to the computer device  100  through a network. Examples of the above network include, but are not limited to, the Internet, the intranet, the local area network, the mobile communication network, and combinations thereof. 
     The transmission device  1006  is used for receiving or sending data via a network. The specific examples of the above network may include a wireless network provided by a communication provider of the computer device  100 . In one example, the transmission device  1006  includes a network adapter (NIC, Network Interface Controller), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device  1006  may be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner. 
     The technical solutions described in the embodiments of the present disclosure can be arbitrarily combined if there is no confliction. 
     In the several embodiments provided by the present disclosure, it should be understood that the disclosed method and smart device may be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be other division manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be ignored or not implemented. In addition, the coupling, direct coupling or communication connection among the displayed or discussed components may be implemented through some interfaces, or indirect coupling or communication connection of the device or unit, and may be electrical, mechanical, or other forms. 
     The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, which may be located in one place or distributed to multiple network units; and some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment. 
     In addition, each functional unit in each embodiment of the present disclosure may be integrated into a second processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into a unit; and the above integrated unit may be implemented in the form of hardware, or in the form of hardware plus software functional units. 
     The above contents are only specific embodiments of the present disclosure, and the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present disclosure, which should be covered by the protection scope of the present disclosure.