WO2021238744A1 - Data transmission method and device - Google Patents

Abstract

The present application discloses a data transmission method and device, relating to the field of communications. In the data transmission method, when a certain application program on a terminal is started, the terminal can acquire a URSP matching the application program, determine, from a plurality of RSDs in the URSP, a first RSD having the optimal data transmission effect for a corresponding PDU session, and transmit data of the application program to a network device of a core network by means of the PDU session corresponding to the first RSD. As the data transmission effect of the PDU session corresponding to the first RSD is optimal, slowness and interruption during data transmissions in a network can be effectively relieved, thereby improving the user's network access experience.

Description

Data transmission method and device

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office on May 28, 2020, the application number is 202010470944.0, and the application name is "Data Transmission Method and Device", the entire content of which is incorporated into this application by reference.

Technical field

The embodiments of the present application relate to the field of communications, and in particular, to a data transmission method and device.

Background technique

With the rapid development of communication technology, the fifth-generation mobile communication technology (fifth-Generation, 5G) network has introduced the User Equipment Route Selection Policy (URSP), which can be used to implement the core network and user equipment ( Also known as data transmission between terminals). For example, multiple URSPs may be configured in the core network, and each URSP may include a traffic descriptor (Traffic Descriptor) and a route selection descriptor (Route Selection Descriptors, RSD). When an application on the terminal is started, it can match the TrafficDescriptor in the URSP configured by the core network to determine the corresponding URSP according to the traffic characteristics of the application started by the terminal. Then, the terminal can transmit data for the launched application with the core network according to the determined RSD in the URSP.

In the prior art, when a URSP is configured in a core network, each URSP generally includes multiple RSDs, and corresponding priorities can be configured for different RSDs in each URSP according to service requirements and service types. After matching the corresponding URSP, the terminal can select the RSD with the highest priority to transmit data for the launched application between the RSD and the core network according to the priority of each RSD that has been configured in the core network.

Summary of the invention

The embodiments of the present application provide a data transmission method and device, which can effectively reduce the phenomenon of slow network and network interruption in the data transmission process, thereby improving the user's online experience.

In the first aspect, an embodiment of the present application provides a data transmission method. The method may include: when the application is started, the terminal obtains a URSP that matches the application. Among them, the URSP includes multiple RSDs, and each RSD of the multiple RSDs is used to indicate a corresponding Protocol Data Unit (PDU) session. The terminal determines the first RSD from the multiple RSDs, and the first RSD is the RSD with the best data transmission effect for the corresponding PDU session among the multiple RSDs. The terminal transmits application data with the network device through the PDU session corresponding to the first RSD.

In this data transmission method, when the terminal and the network device transmit application data, the selected first RSD is the RSD with the best data transmission effect corresponding to the PDU session among the multiple RSDs, which can effectively reduce the network existing in the data transmission process. Slowness, network interruption, etc., thereby improving the user’s online experience.

In a possible design, the URSP may also include a priority corresponding to each of the multiple RSDs, and the priority may be used to indicate the data transmission effect of the PDU session of the corresponding RSD. The higher the priority, the better the data transmission effect of the PDU session corresponding to the RSD. The terminal determining the first RSD from the multiple RSDs may include: the terminal determines the RSD with the highest priority as the first RSD according to the priority corresponding to each RSD of the multiple RSDs.

Since the priority can be used to indicate the data transmission effect of the PDU session corresponding to the RSD, the terminal only needs to determine the RSD with the highest priority to obtain the first RSD with the best data transmission effect of the corresponding PDU session.

In another possible design, the data transmission method may further include: obtaining the data transmission effect of the PDU session when the terminal performs data transmission through the PDU session corresponding to the first RSD. The terminal updates the priority corresponding to the first RSD according to the data transmission effect of the PDU session.

Similarly, referring to the first RSD, the terminal can also update the priority of other RSDs in the URSP in this manner. When the terminal transmits data through the PDU session corresponding to the RSD, the priority corresponding to the RSD is updated according to the data transmission effect of the PDU session, so that the priority of the RSD in the URSP can be dynamically updated according to the transmission effect of the corresponding PDU session. Therefore, the priority of each RSD can more accurately indicate the data transmission effect of the corresponding PDU session.

In some embodiments, the terminal updates the priority corresponding to the first RSD according to the data transmission effect of the PDU session, which may include: the terminal determines that the data transmission in the PDU session is interrupted, and reduces the priority corresponding to the first RSD by the first value.

In this way, the priority corresponding to the first RSD can be updated according to whether the data transmission in the PDU session corresponding to the first RSD is interrupted.

In other embodiments, the terminal updates the priority corresponding to the first RSD according to the data transmission effect of the PDU session, which may also include: the terminal determines that the data transmission in the PDU session is delayed, and reduces the priority corresponding to the first RSD The second value. The data transmission delay in the PDU session includes at least one of the following: the data transmission time is greater than the transmission duration threshold, the data packet loss rate is greater than the packet loss threshold, and the data transmission rate is less than the transmission rate threshold.

In this way, it is also possible to update the priority corresponding to the first RSD according to whether the data transmission in the PDU session corresponding to the first RSD is delayed (for example, the network is slow).

In some other embodiments, the terminal updates the priority corresponding to the first RSD according to the data transmission effect of the PDU session, which may also include: the terminal determines that the data transmission in the PDU session is not interrupted or delayed within a preset period, The priority corresponding to the first RSD is increased by a third value.

In this way, the update mechanism of the priority corresponding to the RSD can be further improved, and the accuracy of the RSD priority indicating the data transmission effect of the corresponding PDU session can be improved.

In some other possible designs, after the terminal determines that the data transmission in the PDU session is interrupted, the method may further include: the terminal determines that the data transmission in the PDU session is within a preset time period after the interruption of the data transmission in the PDU session Not restored. The terminal determines the second RSD from the multiple RSDs, and transmits the application data with the network device through the PDU session corresponding to the second RSD. The priority corresponding to the second RSD is less than the priority corresponding to the first RSD, and is greater than the priority corresponding to other RSDs among the multiple RSDs.

When the data transmission in the PDU session corresponding to the first RSD is not resumed within the preset time after the interruption, the second RSD is reselected in this way, and the data transmission is performed through the PDU session corresponding to the second RSD, which can be resumed in time The user goes online to further ensure the user's online experience.

In some other possible designs, after the terminal determines that the data transmission in the PDU session is delayed, the method may further include: the terminal determines that the number of delays in the data transmission in the PDU session within a preset period is greater than or equal to the reselection threshold . The terminal determines the second RSD from the multiple RSDs, and transmits application data with the network device through the PDU session corresponding to the second RSD. The priority corresponding to the second RSD is less than the priority corresponding to the first RSD, and is greater than the priority corresponding to other RSDs among the multiple RSDs.

When the first RSD corresponds to the data transmission in the PDU session, the frequency of delays is relatively high. For example, when the number of delays in the preset period is greater than or equal to the reselection threshold, the second RSD can also be reselected and passed the first RSD. 2. The PDU session corresponding to the RSD performs data transmission, thereby ensuring the user's online experience.

Optionally, the priority corresponding to each RSD in the multiple RSDs is the priority after the initial priority is updated according to the data transmission effect of the corresponding PDU session. The initial priority is the pre-configured priority.

In a second aspect, an embodiment of the present application provides a data transmission device. The data transmission device may include: a unit or means for performing each step of the first aspect above. For example, the data transmission device may include: an acquisition unit, a determination unit, and a data transmission unit.

In a third aspect, an embodiment of the present application provides a data transmission device. The data transmission device may include a processor and an interface circuit. The processor is configured to communicate with other devices through the interface circuit and execute the method provided in the above first aspect. The processor may include one or more. For example, the data transmission device may be a chip system.

In a fourth aspect, an embodiment of the present application provides a data transmission device. The data transmission device may include a processor, which is configured to be connected to a memory and call a program stored in the memory to execute the method provided in the above first aspect. The memory may be located in the data transmission device or outside the data transmission device. And the processor includes one or more.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, including: computer software instructions; when the computer software instructions run on a data transmission device or a chip built in the data transmission device, the data transmission device executes the above On the one hand, the method provided.

The above data transmission device may be located in the terminal.

In a sixth aspect, an embodiment of the present application provides a data transmission program, which is used to execute the method provided in the above first aspect when the program is executed by a processor. The processor includes one or more.

In a seventh aspect, an embodiment of the present application provides a program product, such as a computer-readable storage medium, including the above program.

Understandably, the beneficial effects that can be achieved by the data transmission device described in any one of the second to fifth aspects, the program described in the sixth aspect, and the program product described in the seventh aspect provided above, Refer to the first aspect and the beneficial effects of any possible design methods, which will not be repeated here.

Description of the drawings

FIG. 1 shows a schematic diagram of the composition of a communication system provided by an embodiment of the present application;

FIG. 2 shows a schematic diagram of the composition of a terminal provided by an embodiment of the present application;

FIG. 3 shows a schematic flowchart of a data transmission method provided by an embodiment of the present application;

FIG. 4 shows another schematic flowchart of a data transmission method provided by an embodiment of the present application;

FIG. 5 shows another schematic flowchart of a data transmission method provided by an embodiment of the present application;

FIG. 6 shows another schematic flowchart of a data transmission method provided by an embodiment of the present application;

FIG. 7 shows another schematic flowchart of a data transmission method provided by an embodiment of the present application;

FIG. 8 shows a schematic structural diagram of a data transmission device provided by an embodiment of the present application.

Detailed ways

In 5G, multiple URSPs can be configured in the core network, and each URSP can include Traffic Descriptor and RSD. When an application on a user equipment (also called a terminal) that is in communication with the core network is started, it can match the TrafficDescriptor in the URSP configured by the core network to determine the corresponding URP according to the traffic characteristics of the application started by the terminal. Then, the terminal can transmit data for the launched application with the core network according to the determined RSD in the URSP. The application of URSP and RSD highlights the advantages of 5G compared to (fourth-Generation, 4G), which can obtain independent logical resource usage qualifications from limited material resources, and accurately enhance users' online experience.

Generally speaking, each URSP configured in the core network includes multiple RSDs. In the prior art, when a communication operator or a service party configures a URSP, it will configure corresponding priorities for different RSDs in each URSP according to service requirements, service types, etc. After matching the corresponding URSP, the terminal can select the RSD with the highest priority and the core network to transmit data for the launched application according to the priority of each RSD that has been configured in the URSP.

The embodiment of the present application provides a data transmission method. In the data transmission method, when a certain application program on the terminal is started, the terminal can obtain a URSP matching the application program. The URSP contains multiple RSDs, and each RSD of the multiple RSDs is used to indicate a corresponding PDU session. For example, the RSD may contain parameters for establishing a corresponding PDU session. Then, the terminal may determine the first RSD from the multiple RSDs, and transmit application data with the network device of the core network according to the PDU session corresponding to the establishment parameter included in the first RSD. Wherein, the first RSD is the RSD with the best data transmission effect corresponding to the PDU session among the multiple RSDs.

In the data transmission method provided by the embodiments of the present application, when the terminal and the network device transmit application data, the selected first RSD is the RSD with the best data transmission effect corresponding to the PDU session among the multiple RSDs. Therefore, relative to In terms of the priority levels corresponding to different RSD configurations in each URSP according to service requirements, service types, etc., in terms of the way in which data for the launched application is transmitted between the terminal and the core network, the first RSD in this application corresponds to The data transmission effect of the PDU session is better, which can effectively reduce the slow network and network interruption in the data transmission process, thereby improving the user's online experience.

It should be noted that in the description of this application, "at least one" refers to one or more, and "multiple" refers to two or more. The words "first" and "second" are only used for distinguishing description, and are not used to specifically limit a feature. "And/or" is used to describe the association relationship of the associated objects, indicating that there can be three types of relationships. For example, A and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects before and after are in an "or" relationship.

The data transmission method provided in the embodiments of the present application will be exemplarily described below in conjunction with the accompanying drawings.

Fig. 1 shows a schematic diagram of the composition of a communication system provided by an embodiment of the present application.

As shown in FIG. 1, the communication system of the embodiment of the present application may include: at least one terminal 110 and at least one network device 120 (FIG. 1 exemplarily shows one terminal 110 and one network device 120). The terminal 110 and the network device 120 may be connected to each other for communication, for example, may be connected through a wired network or a wireless network.

The network device 120 is a core network device of the communication system, and multiple URSPs may be configured, and each URSP may include TrafficDescriptor and RSD. One or more applications can be installed on the terminal 110. When an application on the terminal 110 is started, the terminal 110 can match the TrafficDescriptor in the URSP from the network device 120 according to the traffic characteristics of the started application to obtain Corresponding URSP. The network device 120 may deliver the URSP matching the started application to the terminal 110. Then, the terminal 110 can route the data of the launched application according to the received URSP, that is, transmit data corresponding to the launched application with the network device 120.

Optionally, the communication system may be a Global System of Mobile Communication (GSM) system, a Code Division Multiple Access (CDMA) system, and a Wideband Code Division Multiple Access (WCDMA) system. ) System, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex, TDD) system, Universal Mobile Tele Communication System (UMTS), and other wireless communication systems using Orthogonal Frequency Division Multiplexing (OFDM) technology, etc. This application is specific to the communication system The type is not restricted.

Optionally, the terminal 110 (or, also referred to as User Equipment (UE)) in the communication system may be a mobile phone ("cellular" phone), a cell phone, a computer, a cordless phone, or a session initiation protocol (Session Initiation Protocol, SIP) telephone, wireless local loop (Wireless Local Loop, WLL) station, personal digital assistant (PDA), laptop computer, handheld communication device, handheld computing device, satellite wireless Equipment, wireless modem cards, TV set-top boxes (Set Top Box, STB), Customer Premise Equipment (CPE), and other equipment used to communicate on the wireless system, etc. The specific expression form of the terminal 110 in this application No restrictions.

In the embodiment of the present application, the communication system may also include access network equipment, such as various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, and access points. For example, the access network equipment may include: the aforementioned base station in GSM or CDMA, the aforementioned base station in WCDMA or LTE, and so on.

It is understandable that the communication system described in the embodiments of the present application is only used to describe the technical solutions of the embodiments of the present application more clearly, and does not constitute a limitation on the technical solutions provided in the embodiments of the present application. For example, the communication system may also include other devices, such as network controllers, mobility management entities and other network entities. In addition, those of ordinary skill in the art know that with the evolution of network architectures and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

FIG. 2 shows a schematic diagram of the composition of a terminal provided by an embodiment of the present application. As shown in FIG. 2, the terminal may include: at least one processor 21, a memory 22, a communication interface 23, and a bus 24.

The following describes each component of the terminal in detail with reference to Figure 2:

The processor 21 is the control center of the terminal, which may be a processor or a collective name for multiple processing elements. For example, the processor 21 is a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement the embodiments of the present application For example, one or more microprocessors (Digital Signal Processor, DSP), or one or more Field Programmable Gate Array (FPGA).

The processor 21 can execute various functions of the terminal by running or executing a software program stored in the memory 22 and calling data stored in the memory 22. For example, the data transmission method provided in the embodiment of the present application can be executed.

In a specific implementation, as an embodiment, the processor 21 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG. 2.

In a specific implementation, as an embodiment, the terminal may include multiple processors, such as the processor 21 and the processor 25 shown in FIG. 2. Each of these processors can be a single-core processor (single-CPU) or a multi-core processor (multi-CPU). The processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).

The memory 22 is used to store a software program for executing the solution of the present application, and is controlled by the processor 21 to execute. The memory 22 may be a read-only memory (Read-Only Memory, ROM) or other types of static storage devices that can store static information and instructions, random access memory (Random Access Memory, RAM), or other types that can store information and instructions The dynamic storage device can also be electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), CD-ROM (Compact Disc Read-Only Memory, CD-ROM) or other optical disc storage, optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this. The memory 22 may exist independently, and is connected to the processor 21 through the bus 24. The memory 22 may also be integrated with the processor 21.

Optionally, the processor 21 and/or the memory 22 may also store other application programs, such as a chat application program, a shopping application program, a music application program, a news application program, and the like. When the processor 21 executes these application programs, different Internet functions can be realized.

The communication interface 23 uses any device such as a transceiver to communicate with other equipment or a communication network, for example, it can communicate with network equipment of the core network. The communication interface 23 may be an Ethernet interface, a radio access network (Radio Access Network, RAN) interface, a wireless local area network (Wireless Local Area Networks, WLAN) interface, and the like. The communication interface 23 may include a receiving unit to implement a receiving function, and a sending unit to implement a sending function.

The bus 24 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 2 to represent it, but it does not mean that there is only one bus or one type of bus.

Of course, in actual application, the processor 21, the memory 22, and the communication interface 23 in the terminal may not be connected through a bus structure, but may be other structures, such as a star structure, which is not specifically limited in this application.

Fig. 3 shows a schematic flowchart of a data transmission method provided by an embodiment of the present application. As shown in Figure 3, the data transmission method may include:

S301. When the application is started, the terminal obtains a URSP matching the application.

For example, multiple URSPs may be configured in the core network (or network equipment). Each URSP can include: Traffic Descriptor, RSD.

Among them, Traffic Descriptor can be used to indicate which applications are applicable to the URSP rule. RSD can be used to describe the components of routing. The URSP may contain multiple RSDs, and each RSD of the multiple RSDs may be used to indicate a corresponding PDU session. For example, the RSD can contain key parameters for establishing a PDU session, such as: Data Network Name (DNN), Network Slice Selection Policy (Network Slice Selection Policy), Single Network Slice Selection Support Information (Single Network Slice Selection Assistance) Information, S-NSSAI), PDU session type (Session Type) and other parameters. PDU sessions corresponding to different RSDs may provide different Internet experience.

When the application on the terminal is started, the terminal can initiate a routing request to the network device. The routing request can be used to indicate the traffic characteristics of the launched application. The network device can match the TrafficDescriptor that meets the traffic characteristics of the started application according to the routing request, and deliver the URSP corresponding to the matched TrafficDescriptor as the URSP that matches the application to the terminal.

After obtaining the URSP matching the application, the terminal can select the first RSD corresponding to the best data transmission effect of the PDU session from the multiple RSDs contained in the URSP, and communicate with the network device through the PDU session corresponding to the first RSD Transfer application data.

For example, in a possible implementation manner, the URSP may also include a priority corresponding to each RSD of the multiple RSDs. The priority may be used to indicate the data transmission effect of the PDU session corresponding to the RSD. The higher the priority, the corresponding RSD The better the data transmission effect of the PDU session.

Correspondingly, the terminal may specifically determine the RSD with the highest priority as the first RSD according to the priority corresponding to each of the multiple RSDs included in the URSP that matches the application, and use the PDU session corresponding to the first RSD. Transfer application data with network devices.

For example, after the aforementioned S301, the data transmission method may further include the following S302 and S303:

S302. The terminal determines the RSD with the highest priority as the first RSD according to the priority corresponding to each RSD among the multiple RSDs included in the URSP, and the priority is used to indicate the data transmission effect of the PDU session corresponding to the RSD.

S303. The terminal transmits application data with the network device through the PDU session corresponding to the first RSD.

Specifically, when the PDU session corresponding to the first RSD already exists, the terminal may route the data of the application program to the existing PDU session for transmission with the network device. When the PDU session corresponding to the first RSD does not yet exist, the terminal can first establish a new corresponding PDU session according to the key parameters of the PDU session establishment contained in the first RSD, and then route the application data to the newly established PDU session. In the PDU session, it transmits with the network device. That is, in the embodiment of the present application, the terminal may multiplex an existing PDU session or establish a new PDU session for data transmission according to the first RSD.

From the foregoing, in the data transmission method provided by the embodiment of the present application, the terminal can transmit application data with the core network (network device) through the PDU session corresponding to the first RSD. The first RSD is the RSD with the best data transmission effect corresponding to the PDU session among the multiple RSDs included in the URSP. Therefore, there will be fewer phenomena such as slower network and network interruption during the data transmission process.

for example:

When the network is slow, the data transmission in the PDU session will have high packet loss rate and low transmission efficiency, resulting in poor Internet experience for users (herein referred to as users who use the terminal to access the Internet). When the network is interrupted, the data transmission in the PDU session will be interrupted, causing the terminal to be unable to communicate with the core network about the application program, and the user cannot realize the corresponding Internet functions through the application, such as chatting, shopping, etc. In the embodiment of this application, the first RSD is the RSD with the best data transmission effect. Compared with other RSDs in URSP, when data is transmitted through its corresponding PDU session, the packet loss rate is lower and the transmission efficiency is higher. High, the possibility of interruption in data transmission is lower. As far as users are concerned, they can perceive that the network is slower, network interruptions, and other phenomena will be less, which can effectively improve the user's online experience.

The following describes how to set the priority corresponding to the RSD in the embodiment of the present application:

It can be seen from the foregoing embodiments that the priority corresponding to the RSD can be used to indicate the data transmission effect of the corresponding PDU session. The higher the priority, the better the data transmission effect of the PDU session corresponding to the RSD. Based on this understanding, in the embodiment of the present application, the respective priorities of the multiple RSDs included in the URSP can be set according to the data transmission effect of each RSD corresponding to the PDU session. For example, for each URSP, the initial priority can be set for multiple RSDs in the URSP. Then, according to the data transmission effect of each RSD corresponding PDU session, the corresponding initial priority is updated. For example, the corresponding initial priority can be updated according to the number or time of interruption, delay, etc. of data transmission in the corresponding PDU session of each RSD. In the foregoing data transmission method provided by the embodiment of the present application, the priority corresponding to each RSD among the multiple RSDs included in the URSP may be the priority after updating the initial priority according to the data transmission effect of the corresponding PDU session. . Therefore, the priority corresponding to the RSD can be used to indicate the data transmission effect of the corresponding PDU session.

Optionally, the initial priority may be a pre-configured priority. For example, it can be pre-configured by the operator or service party.

In some embodiments, the initial priority can be pre-configured according to business requirements and business types. For example, according to the service type and service requirements of the data service to be carried by the PDU session corresponding to the RSD, corresponding initial priorities can be configured for multiple RSDs in the URSP, and different RSDs correspond to different initial priorities. Before updating its corresponding initial priority according to the data transmission effect of the RSD corresponding to the PDU session, the terminal can determine the RSD with the highest priority according to the initial priority corresponding to the RSD, and pass the PDU session corresponding to the RSD with the highest priority , Transmit application data with the core network. During the data transmission process, the initial priority can be updated according to the data transmission effect of the corresponding PDU session.

In still other embodiments, multiple RSDs in the URSP may be configured with the same initial priority. When the terminal transmits application data to the core network through the PDU session corresponding to the RSD, the initial priority can be updated according to the data transmission effect of the corresponding PDU session. Of course, it should be noted that in this type of implementation, since multiple RSDs in the URSP correspond to the same initial priority, the RSD with the highest priority cannot be determined based on the initial priority. Therefore, before updating its corresponding initial priority according to the data transmission effect of the RSD corresponding PDU session, when transmitting application data between the terminal and the core network, it can also be based on the data service that the PDU session corresponding to the RSD needs to carry. According to the service type and service requirements, determine the appropriate RSD corresponding PDU session for data transmission.

The following is an example of an implementation manner in which multiple RSDs in URSP have the same initial priority (the initial priority is pre-configured according to business needs and business types, and the implementation is similar to this example, and the difference is only that the initial priority is different. , No more examples here).

Assume that multiple RSDs (such as RSD1, RSD2, RSD3...RSDn, etc.) in a certain URSP are configured with the same initial priority. When the terminal matches the URSP for the first time, it can set the default priority for each RSD in the URSP (different from The aforementioned initial priority), the RSD with the highest default priority is determined for data transmission. Assuming that the RSD with the highest default priority is RSD1, when the terminal transmits application data to the core network through the PDU session corresponding to RSD1, it can update the initial priority of RSD1 according to the data transmission effect of the PDU session corresponding to RSD1 .

Optionally, in the data transmission method provided in the embodiment of the present application, when the priority corresponding to the RSD in the URSP matched by the terminal has been updated according to the data transmission effect of the corresponding PDU session, if the terminal is passing the RSD When the corresponding PDU session (such as the first RSD) performs data transmission, the data transmission effect of the PDU session can also be continuously obtained, and the priority corresponding to the RSD is updated according to the data transmission effect of the PDU session. The specific update method can be the same as the update method of the initial priority described above.

The following takes the update of the priority of the first RSD as an example for description. The method of updating the priority of other RSDs or the initial priority of the RSD is the same as the method of updating the priority of the first RSD, and will not be repeated here.

There are three ways to update the priority of the first RSD:

1) The terminal determines that the data transmission in the PDU session corresponding to the first RSD is interrupted, and reduces the initial priority corresponding to the first RSD by a first value.

Specifically, it is possible to determine whether the data transmission in the PDU session is interrupted by monitoring abnormal events such as dorecovery events, bottom layer disconnection and link disconnection.

2) The terminal determines that the data transmission in the PDU session corresponding to the first RSD is delayed, and reduces the initial priority corresponding to the first RSD by a second value.

Wherein, the data transmission delay in the PDU session includes at least one of the following: the data transmission time is greater than the transmission duration threshold, the data packet loss rate is greater than the packet loss threshold, and the data transmission rate is less than the transmission rate threshold.

3) The terminal determines that the data transmission in the PDU session corresponding to the first RSD has no interruption and delay within the preset period, that is, there is no interruption within the preset period and the number of delays is 0, and the first RSD corresponds to The initial priority is increased by a third value.

The preset period can be 5 seconds (S), 10S, 20S, etc., and the specific size of the preset period is not limited in this application.

Take the way of indicating the priority by a score, and the score corresponding to the priority of the first RSD before the update is 50 as an example. If the first value can be 1, when the terminal determines that the data transmission in the PDU session corresponding to the first RSD is interrupted, the priority score corresponding to the first RSD can be reduced from 50 to 49. The second value may be 10. When determining that the data transmission in the PDU session corresponding to the first RSD is delayed, the terminal may reduce the priority score corresponding to the first RSD from 50 to 40. The third value may be 1, and the terminal may increase the priority score corresponding to the first RSD from 50 to 51 when determining that the data transmission in the PDU session corresponding to RSD1 is not interrupted or delayed within the preset period.

It should be noted that this application does not limit the initial priority scores, the first value, the second value, and the third value mentioned above. For example, the initial priority score may also be 0, 10, 20, 100 and other values. The first value and the third value can be the same or different. The second value may be 10, or a larger value such as 20, 30, or a smaller value such as 2, 5.

Optionally, in the foregoing priority update process, the preset period can be implemented by setting a period timer.

In the following, taking the preset period of 5 minutes (not limited to 5 minutes), that is, the period timer is a 5-minute timer, as an example, the specific update process of the priority of the first RSD will be described with reference to FIG. 4. FIG. 4 shows another schematic flowchart of a data transmission method provided by an embodiment of the present application. As shown in Figure 4, after the above S301-S303, the data transmission method may further include:

S401: Determine whether the data transmission in the PDU session corresponding to the first RSD is interrupted.

If the data transmission in the PDU session corresponding to the first RSD is interrupted, S402 is executed. If the data transmission in the PDU session corresponding to the first RSD is not interrupted, S403 is executed to start a 5-minute timer, and S404 is executed.

S402: Decrease the priority corresponding to the first RSD by a first value.

S403. Start a 5-minute timer.

S404: Determine whether the data transmission in the PDU session corresponding to the first RSD is delayed.

If the data transmission in the PDU session corresponding to the first RSD is delayed, S405 and S406 are executed in sequence. If the data transmission in the PDU session corresponding to the first RSD is not delayed, S406 is directly executed.

S405. Decrease the priority corresponding to the first RSD by a second value.

S406: Determine whether the 5-minute timer expires.

If the 5-minute timer expires, S407 is executed. If the 5-minute timer does not expire, return to S404.

S407: Determine whether the number of delays in data transmission in the PDU session corresponding to the first RSD is 0.

If the number of data transmission delays in the PDU session corresponding to the first RSD is 0, S408 and S409 are executed in sequence, and then S404 is returned. If the number of data transmission delays in the PDU session corresponding to the first RSD is not 0, S409 is directly executed, and S404 is returned.

S408: Increase the priority corresponding to the first RSD by a third value.

S409. Restart the 5-minute timer.

It should be noted that the foregoing FIG. 4 is only an exemplary description of the implementation logic of the data transmission method in this embodiment of the application, and is not intended to be limiting. For example, in actual implementation, S401 is not limited to be executed before S403, but can be executed in parallel with S403-S409. That is, during the process of executing S403-S409, the terminal can execute S401 synchronously and in real time to determine whether the data transmission in the PDU session corresponding to the first RSD is interrupted. When the data transmission in the PDU session corresponding to the first RSD has not been interrupted, it will be executed according to the execution logic of S403-S409. When the data transmission in the PDU session corresponding to the first RSD is interrupted, S402 will be jumped to. Correspondingly, when the data transmission interruption in the PDU session corresponding to the first RSD is resumed, the execution of S403-S409 may continue to be resumed.

Because the embodiment of the application performs data transmission through the PDU session corresponding to the RSD (such as the first RSD), the data transmission effect of the PDU session can be obtained, and the priority corresponding to the RSD can be updated according to the data transmission effect of the PDU session. . Therefore, the embodiment of the present application further realizes that the priority of the corresponding RSD is dynamically updated according to the data transmission effect of the PDU session. Therefore, each time the terminal subsequently matches the URSP, it can select the PDU session bearer service corresponding to the RSD with the best data transmission effect.

In addition, it is understandable that the terminal described in the embodiment of the application updates the priority (or initial priority) of its corresponding RSD according to the data transmission effect of the PDU session, which can be specifically implemented in the following manner: The priority (or initial priority) corresponding to the RSD is reduced by the first value or the second value, or an instruction to increase the third value is sent to the network device of the core network. After receiving the instruction, the network device can control the core according to the instruction. The network updates the priority (or initial priority) of the RSD in the URSP. I will not repeat the update interaction process in detail here.

Further, in the prior art, under a 5G Stand Alone (SA) network, after an application on a terminal (such as a mobile phone) is started and matched to the URSP, it is established or multiplexed according to a certain RSD in the URSP. In the corresponding PDU session, if the PDU session establishment or multiplexing fails, other RSDs in the URSP will be traversed, and the next RSD will be selected to establish or multiplex the corresponding PDU session. If the PDU session is established or multiplexed successfully, data transmission will always be performed through the PDU session corresponding to the current RSD.

Based on this, the embodiment of the present application further provides a data transmission method on the basis of the data transmission method shown in FIG. 4 described above. In the data transmission method, after the terminal determines that the data transmission in the PDU session corresponding to the first RSD is interrupted, if it is determined that the data transmission in the PDU session corresponding to the first RSD is interrupted within a preset period of time, the first RSD If the data transmission in the corresponding PDU session is not resumed, the second RSD can be determined from the multiple RSDs, and the data of the application program can be transmitted with the network device through the PDU session corresponding to the second RSD. The priority corresponding to the second RSD is less than the priority corresponding to the first RSD, and is greater than the priority corresponding to other RSDs among the multiple RSDs.

Among them, the preset duration can be 10S, 15S, 20S, and so on. Similar to the aforementioned preset period, in the embodiment of the present application, the judgment logic of the preset duration can also be implemented by means of a timer. For example, when the data transmission in the PDU session corresponding to the first RSD is interrupted, a 20S timer can be started, and after the 20S timer expires, it can be determined whether the data transmission in the PDU session corresponding to the first RSD is resumed.

It should be noted that in the specific implementation process, the size of the preset duration can be set according to actual needs, and this application is not limited here. In addition, it can be understood that the timer is only an implementation manner of the preset duration. In other embodiments of the present application, it may not be implemented by a timer. For example, the terminal determines the data in the PDU session corresponding to the first RSD. After the transmission is interrupted, it can be continuously determined whether the data transmission in the PDU session corresponding to the first RSD is resumed, and if the data transmission in the PDU session corresponding to the first RSD is not resumed, then the second RSD is reselected. This application also does not limit the implementation of the preset duration.

In the embodiment of this application, since the PDU session corresponding to the first RSD is interrupted and is not restored within the preset time period, the terminal may according to the reselection priority is lower than the priority corresponding to the first RSD and greater than other RSDs. The priority second RSD corresponding to the RSD is used for data transmission through the PDU session corresponding to the second RSD. Therefore, when a network interruption occurs, the user can resume the Internet in time to ensure the user's service experience.

In the following, with reference to Figure 5, taking the preset duration of 20S as an example, when the terminal determines that the data transmission in the PDU session corresponding to the first RSD has not resumed within the preset duration after the interruption, the specific steps for reselecting the second RSD Be explained:

FIG. 5 shows another schematic flow chart of the data transmission method provided by an embodiment of the present application.

As shown in FIG. 5, based on the data transmission method shown in FIG. 4, if it is determined in S401 that the data transmission in the PDU session corresponding to the first RSD is interrupted, the data transmission method may further include:

S501: Start a 20S timer.

S502: Determine whether the 20S timer expires.

If the 20S timer expires, S503 is executed. If the 20S timer does not expire, return to S502.

S503: Determine whether the data transmission in the PDU session corresponding to the first RSD is resumed.

If the data transmission in the PDU session corresponding to the first RSD is not resumed, perform S504. If the data transmission in the PDU session corresponding to the first RSD is resumed, return to S401.

S504. Determine a second RSD from the multiple RSDs, where the priority corresponding to the second RSD is less than the priority corresponding to the first RSD and greater than the priority corresponding to other RSDs in the multiple RSDs.

S505: Transmit application data with the network device through the PDU session corresponding to the second RSD.

Optionally, on the basis of the data transmission method shown in FIG. 4 and/or FIG. 5, an embodiment of the present application further provides a data transmission method. In the data transmission method, if the terminal determines that the number of times that the data transmission in the PDU session is delayed within a preset period is greater than or equal to the reselection threshold, it can determine the second RSD from a plurality of RSDs, and pass the second RSD corresponding PDU session, to transmit the data of the application program with the network device. The priority corresponding to the second RSD is less than the priority corresponding to the first RSD, and is greater than the priority corresponding to other RSDs among the multiple RSDs.

That is, in this embodiment of the present application, the terminal may promptly change the PDU session corresponding to the second RSD to perform data transmission when the number of delays in data transmission in the PDU session corresponding to the first RSD is greater than or equal to the reselection threshold. As a result, it is possible to prevent the user from surfing the Internet due to a slow network, and to further ensure the user's service experience.

Among them, the reselection threshold may be 2, 3, 4, 5, etc., and the specific size of the reselection threshold is not limited in this application. In addition, as described in the foregoing embodiment, the preset period (the same object as the preset period described in the foregoing embodiment) can be 5 seconds (S), 10S, 20S, etc., which can be achieved by setting a period timer , I won’t repeat it here.

In the following, with reference to Figure 6, taking the reselection threshold value of 3 times and the period timer corresponding to the preset period as the 5-minute timer as an example, the number of delays in the preset period for the terminal in determining the data transmission in the PDU session is greater than or When it is equal to the reselection threshold, the specific steps for reselecting the second RSD are explained:

FIG. 6 shows another schematic flow chart of the data transmission method provided by an embodiment of the present application.

As shown in FIG. 6, based on the data transmission method shown in FIG. 4 and/or FIG. 5 (take FIG. 4 as an example), if it is determined in S406 that the 5-minute timer expires, before S407 is executed, the The data transmission method may also include:

S601: Determine whether the number of delays in data transmission in the PDU session corresponding to the first RSD is greater than or equal to 3 times.

If the number of data transmission delays in the PDU session corresponding to the first RSD is greater than or equal to 3 times, S602 and S603 are executed. If the number of data transmission delays in the PDU session corresponding to the first RSD is less than 3 times, S407 is executed.

S602. Determine a second RSD from a plurality of RSDs, where the priority corresponding to the second RSD is less than the priority corresponding to the first RSD and is greater than the priority corresponding to other RSDs in the plurality of RSDs.

S603: Transmit application data with the network device through the PDU session corresponding to the second RSD.

Optionally, in this embodiment of the present application, when the data transmission in the PDU session corresponding to the second RSD is interrupted and not resumed within a preset period of time, or when the data transmission in the PDU session corresponding to the second RSD is within the preset period When the number of delays is greater than or equal to the reselection threshold, it is also possible to reselect the PDU session corresponding to the third RSD for data transmission according to the data transmission method shown in FIG. 5 and FIG. 6 described above. The priority corresponding to the third RSD is less than the priority corresponding to the first RSD and the second RSD, and is greater than the priority corresponding to other RSDs among the multiple RSDs. Similarly, you can continue to select the fourth RSD, the fifth RSD, etc., which will not be repeated here.

Optionally, in this embodiment of the present application, after the terminal determines the first RSD, there is no corresponding PDU session that can be multiplexed, and its corresponding PDU session cannot be newly established, it can also be as described in the foregoing embodiment. In the manner of reselecting RSD, the second RSD is selected for data transmission.

For example, FIG. 7 shows another schematic flow chart of the data transmission method provided by an embodiment of the present application. As shown in FIG. 7, in the embodiment of the present application, S303 shown in FIG. 3 may specifically include:

S701: Determine whether there is a reusable PDU session corresponding to the first RSD.

If there is a reusable PDU session corresponding to the first RSD, perform S702. If there is no reusable PDU session corresponding to the first RSD, perform S703.

S702: Transmit application data with a network device through a reusable PDU session corresponding to the first RSD.

S703. According to the first RSD, establish a new PDU session corresponding to the first RSD.

S704: Determine whether the new PDU session corresponding to the first RSD is successfully established.

If the new PDU session corresponding to the first RSD is successfully established, S705 is executed. If the establishment of the new PDU session corresponding to the first RSD fails, S706 and S707 are executed.

S705: Transmit application data with the network device through the new PDU session corresponding to the first RSD.

S706. Determine a second RSD from the multiple RSDs, where the priority corresponding to the second RSD is less than the priority corresponding to the first RSD and greater than the priority corresponding to other RSDs in the multiple RSDs.

S707: Transmit application data with the network device through the PDU session corresponding to the second RSD.

Similarly, for the specific steps of transmitting application data with the network device through the PDU session corresponding to the second RSD, refer to the process from S701 to S707, which will not be repeated here. In some implementations, the third RSD, the fourth RSD, the fifth RSD, etc. may continue to be selected, which will not be repeated here.

In some possible embodiments, when the first RSD with the highest priority is determined according to the data transmission method described in the foregoing embodiments, there may be two or more RSDs with the same highest priority. , You can refer to the method of determining the appropriate RSD according to the service type and service requirements of the data service that the PDU session corresponding to the RSD needs to carry as described in the foregoing embodiment, and determine the appropriate RSD from two or more RSDs with the same highest priority. Out of the first RSD. Similarly, if a similar situation occurs when determining the second RSD, the third RSD, etc., you can refer to the determination method of the first RSD.

In addition, it should be noted that, in the embodiment of the present application, when the terminal executes any of the data transmission methods shown in Figure 5, Figure 6, and Figure 7, if the terminal reselects the RSD to the matched URSP When the last RSD, the judgment logic for reselecting RSD is still triggered, there is no next RSD to be selected in the current URSP. At this time, the terminal can re-match other URSPs in the core network to perform data transmission of the launched application.

For example, multiple URSPs can be configured in the core network. When multiple URSPs are configured, different priorities can also be set for different URSPs according to actual service requirements and service types. When the application on the terminal is started, the terminal can initiate a routing request to the core network, and the core network can match the Traffic Descriptor that meets the traffic characteristics of the application according to the routing request, thereby determining multiple URSPs that match the application. Then, the first URSP with the highest priority among the multiple URSPs is delivered to the terminal. When the terminal executes the data transmission method shown in any one of FIGS. 5, 6, and 7, if the terminal reselects the RSD to the last RSD in the first URSP, the judgment logic for reselecting the RSD is still triggered. Then, a route request can be initiated to the core network again, and the core network can issue to the terminal a second URSP with a priority lower than the first URSP and higher than other URSPs among the multiple URSPs. By analogy, I won't repeat it here.

The foregoing mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between various network elements. It can be understood that each network element, such as a terminal, in order to implement the above-mentioned functions, it includes a hardware structure and/or software module corresponding to each function.

For example, the embodiment of the present application may also provide a data transmission device. The data transmission device may include a unit (or means) for executing each step performed by the terminal in any of the above methods. FIG. 8 shows a schematic structural diagram of a data transmission device provided by an embodiment of the present application. As shown in FIG. 8, the data transmission apparatus may include: an acquisition unit 801, a determination unit 802, and a data transmission unit 803.

The obtaining unit 801 may be used to obtain a URSP matching the application when the application is started. For example, execute S301 in the above method. The determining unit 802 may be configured to determine the RSD with the highest priority as the first RSD according to the priority corresponding to each RSD of the multiple RSDs included in the URSP, and the priority is used to indicate the data transmission effect of the PDU session corresponding to the RSD. For example, execute S302 in the above method. The data transmission unit 803 may be configured to transmit data of the application program with the network device through the PDU session corresponding to the first RSD. For example, execute S303 in the above method.

Optionally, the data transmission unit 803 may also be used to execute S401-S409, S501-S505, S601-S603, etc. in the foregoing method.

It should be noted that all relevant content of the steps involved in the foregoing method embodiment can be cited in the functional description of the corresponding functional unit, and will not be repeated here.

It should be understood that the division of units in the above device is only a division of logical functions, and may be fully or partially integrated into one physical entity in actual implementation, or may be physically separated. In addition, the units in the device can be all implemented in the form of software called by processing elements; they can also be all implemented in the form of hardware; part of the units can also be implemented in the form of software called by the processing elements, and some of the units can be implemented in the form of hardware.

For example, each unit can be a separately set up processing element, or it can be integrated in a certain chip of the device for implementation. In addition, it can also be stored in the memory in the form of a program, which is called and executed by a certain processing element of the device. Function. In addition, all or part of these units can be integrated together or implemented independently. The processing element described here may also be called a processor, and may be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each of the above units may be implemented by an integrated logic circuit of hardware in a processor element or implemented in a form of being called by software through a processing element.

In an example, the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, for example: one or more application specific integrated circuits (ASIC), or, one or Multiple microprocessors (digital singnal processors, DSP), or, one or more field programmable gate arrays (FPGA), or a combination of at least two of these integrated circuits.

For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call programs. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

The above receiving unit is an interface circuit of the device for receiving signals from other devices. For example, when the device is implemented as a chip, the receiving unit is an interface circuit used by the chip to receive signals from other chips or devices. When the communication device includes a unit for sending, the unit for sending is an interface circuit of the device for sending signals to other devices. For example, when the device is implemented as a chip, the sending unit is an interface circuit used by the chip to send signals to other chips or devices.

For example, an embodiment of the present application may provide a data transmission device. The data transmission device may include a processor and an interface circuit. The processor is used to communicate with other devices through the interface circuit and execute the above data transmission method. The processor may include one or more.

In one implementation, the unit for the terminal to implement each step in the above method can be implemented in the form of a processing element scheduler. For example, the device for the terminal includes a processing element and a storage element, and the processing element calls the program stored by the storage element to execute the above The method executed by the terminal in the method embodiment. The storage element may be a storage element on the same chip as the processing element, that is, an on-chip storage element.

In another implementation, the program used to execute the method executed by the terminal in the above method may be a storage element on a different chip from the processing element, that is, an off-chip storage element. At this time, the processing element calls or loads a program from the off-chip storage element on the on-chip storage element to call and execute the method executed by the terminal in the above method embodiment.

For example, an embodiment of the present application may also provide a data transmission device. The data transmission device may include a processor, which is configured to be connected to a memory and call a program stored in the memory to execute the above data transmission method. The memory may be located in the data transmission device or outside the data transmission device. And the processor includes one or more.

In yet another implementation, the terminal that implements each step in the above method may be configured as one or more processing elements, and these processing elements may be provided on the terminal, where the processing elements may be integrated circuits, such as one or Multiple ASICs, or, one or more DSPs, or, one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits can be integrated together to form a chip.

The units for the terminal to implement each step in the above method can be integrated together and implemented in the form of an SOC, and the SOC chip is used to implement the above method. At least one processing element and a storage element can be integrated in the chip, and the above terminal execution method can be realized by the processing element calling the stored program of the storage element; or, at least one integrated circuit can be integrated in the chip for realizing the above terminal execution Or, can be combined with the above implementations, the functions of some units are implemented in the form of calling programs by processing elements, and the functions of some units are implemented in the form of integrated circuits.

The processing element here is the same as the above description, and it can be a general-purpose processor, such as a CPU, or one or more integrated circuits configured to implement the above method, such as: one or more ASICs, or, one or more micro-processing DSP, or, one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms.

The storage element can be a memory or a collective term for multiple storage elements.

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above-mentioned functional modules is used for illustration. In practical applications, the above-mentioned functions can be allocated according to needs. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be It can be combined or integrated into another device, or some features can be omitted or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate. The parts displayed as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

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 readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products, such as programs, in essence or the part that contributes to the prior art, or all or part of the technical solutions. The software product is stored in a program product, such as a computer-readable storage medium, and includes several instructions to make a device (may be a single-chip microcomputer, a chip, etc.) or a processor (processor) execute all of the methods described in the various embodiments of this application Or part of the steps. The aforementioned storage media include: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application shall be covered by the protection scope of this application. . Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (13)

A data transmission method, characterized in that the method includes: When the application is started, the terminal obtains the user equipment routing policy URSP that matches the application; wherein, the URSP includes multiple routing descriptors RSD, and each RSD of the multiple RSDs is used to indicate the corresponding Protocol data unit PDU session; Determining, by the terminal, a first RSD from the plurality of RSDs, where the first RSD is an RSD with the best data transmission effect for a corresponding PDU session among the plurality of RSDs; The terminal transmits the data of the application program with the network device through the PDU session corresponding to the first RSD. The method according to claim 1, wherein the URSP further comprises a priority corresponding to each RSD of the plurality of RSDs, and the priority is used to indicate the data transmission effect of the PDU session corresponding to the RSD, The higher the priority, the better the data transmission effect of the PDU session corresponding to the RSD; The terminal determining the first RSD from the multiple RSDs includes: The terminal determines the RSD with the highest priority as the first RSD according to the priority corresponding to each RSD in the multiple RSDs. The method according to claim 2, wherein the method further comprises: Acquiring, by the terminal, the data transmission effect of the PDU session when performing data transmission through the PDU session corresponding to the first RSD; The terminal updates the priority corresponding to the first RSD according to the data transmission effect of the PDU session. The method according to claim 3, wherein the terminal updating the priority corresponding to the first RSD according to the data transmission effect of the PDU session comprises: The terminal determines that the data transmission in the PDU session is interrupted, and reduces the priority corresponding to the first RSD by a first value. The method according to claim 3 or 4, wherein the terminal updating the priority corresponding to the first RSD according to the data transmission effect of the PDU session comprises: The terminal determines that the data transmission in the PDU session is delayed, and reduces the priority corresponding to the first RSD by a second value. The data transmission delay in the PDU session includes at least one of the following: the data transmission time is greater than The transmission duration threshold, the data packet loss rate is greater than the packet loss threshold, and the data transmission rate is less than the transmission rate threshold. The method according to any one of claims 3-5, wherein the terminal updating the priority corresponding to the first RSD according to the data transmission effect of the PDU session comprises: The terminal determines that the data transmission in the PDU session is not interrupted or delayed within a preset period, and increases the priority corresponding to the first RSD by a third value. The method according to claim 4, wherein after the terminal determines that the data transmission in the PDU session is interrupted, the method further comprises: The terminal determines that the data transmission in the PDU session is not resumed within a preset period of time after the data transmission in the PDU session is interrupted; The terminal determines a second RSD from the plurality of RSDs, and transmits the application data with the network device through the PDU session corresponding to the second RSD, and the priority corresponding to the second RSD is less than The priority corresponding to the first RSD is greater than the priority corresponding to other RSDs in the plurality of RSDs. The method according to claim 5, wherein after the terminal determines that the data transmission in the PDU session is delayed, the method further comprises: Determining, by the terminal, that the number of times that data transmission in the PDU session is delayed within a preset period is greater than or equal to a reselection threshold; The terminal determines a second RSD from the plurality of RSDs, and transmits the application data with the network device through the PDU session corresponding to the second RSD, and the priority corresponding to the second RSD is less than The priority corresponding to the first RSD is greater than the priority corresponding to other RSDs in the plurality of RSDs. The method according to any one of claims 2 to 8, wherein the priority corresponding to each RSD in the plurality of RSDs is the priority after the initial priority is updated according to the data transmission effect of the corresponding PDU session ； The initial priority is a pre-configured priority. A data transmission device, characterized by comprising: a unit for executing each step of the method of any one of claims 1-9. A data transmission device, characterized by comprising: a processor and an interface circuit, the processor is used to communicate with other devices through the interface circuit and execute the method according to any one of claims 1 to 9. A data transmission device, characterized by comprising: a processor, which is configured to be connected to a memory and call a program stored in the memory to execute the method according to any one of claims 1 to 9. A computer-readable storage medium, characterized by comprising: computer software instructions; When the computer software instruction runs in a data transmission device or a chip built in the data transmission device, the data transmission device is caused to execute the method according to any one of claims 1 to 9.

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