CN112788680B

CN112788680B - Data transmission method and related equipment

Info

Publication number: CN112788680B
Application number: CN201911093035.3A
Authority: CN
Inventors: 于游洋
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2022-07-29
Anticipated expiration: 2039-11-07
Also published as: CN112788680A; CN115412981A; WO2021088977A1

Abstract

The embodiment of the application discloses a data transmission method and related equipment; the method can be applied to a 5G communication network architecture, and comprises the following steps: a session management network element acquires first indication information of a first service flow, wherein the first indication information comprises a shunting mode of the first service flow, and the first service flow is a guaranteed bit rate GBR service flow; the session management network element establishes a first QoS flow and/or a second QoS flow for transmitting the first service flow according to the first indication information; because the session management network element establishes two QoS flows for the service flow in advance, when the service flow data needs to move among different flows, the QoS flows established in advance can be directly applied, the movement of the service flow can be realized without reestablishing the flow on the other side, and the time delay is reduced.

Description

Data transmission method and related equipment

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a data transmission method and related equipment.

Background

With the continuous development of wireless broadband technology, the 3GPP standards group has established 5G network architecture in 2016. The framework not only supports the User Equipment (UE) to access the core network through the wireless access technology (such as LTE, 5G RAN and the like) defined by the 3GPP standard group, but also supports the core network to be accessed through the non-3GPP access technology (such as non-trusted WLAN, fixed network and the like), and also supports the core network to be accessed through the 3GPP access technology and the non-3GPP access technology; therefore, a multi-access Protocol Data Unit (PDU) session can be established under the network architecture.

In addition, the 3GPP standard also defines that a service data flow interacted between the UE and the 5G core network is divided into a Guaranteed Bit Rate (GBR) quality of service flow (QoS flow) and a non-guaranteed bit rate (non-GBR flow) QoS flow.

In the prior art, the GBR QoS flow can only be established on one side of the 3GPP side or the non-3GPP side, and when the traffic flow data needs to be moved from one side to the other side, the GBR QoS flow needs to be re-established on the other side, which results in an increase of the delay.

Disclosure of Invention

The embodiment of the application provides a data transmission method and related equipment, which are used for reducing the switching time delay when business flow data is switched from one side to the other side.

A first aspect of an embodiment of the present application provides a method for data transmission;

the session management network element needs to acquire first indication information of a guaranteed bit rate GBR service flow, where the first indication information has a split mode of the service flow, and the session management network element needs to establish a first quality of service flow QoS flow for transmitting the service flow or establish two QoS flows according to the first indication information.

In the process of session establishment and session modification, a session management network element receives a policy rule, that is, first indication information, for guaranteeing a bandwidth GBR traffic flow, which is sent by a policy control unit, where the policy rule includes a quality of service parameter of the traffic flow and a split mode, where the split mode may indicate that the traffic flow is split between two networks, and since QoS management for traffic flow transmission is performed based on a quality of service flow (QoS flow), the session management network element may establish the first quality of service flow QoS flow according to the split mode of the traffic flow, for example, aggregate traffic flows with the same split mode together to form one QoS flow, or establish two flows, that is, the first QoS flow and the second QoS flow, for the traffic flow.

When QoS flow is established for service flow based on a split mode, a session management network element can directly converge service flow with the same split mode into the same QoS flow, the QoS flow corresponding to the service flow is established in advance, when the service flow data needs to be moved or switched between two networks due to some reason, a new GBR QoS flow does not need to be established on the other side again, the service flow data can be directly moved or switched from a first network to a second network according to the QoS flow established in advance, the service flow data can be directly moved or switched from the second network to the first network, so that the switching delay is small, or when the requirement on the bandwidth of the service flow is high, enough bandwidth resources can be provided through the simultaneous transmission of the first network and the second network.

Based on the first aspect, an embodiment of the present application further provides a first implementation manner of the first aspect:

when the session management network element establishes the QoS flow, a first QoS flow may be established through a first access technology, and when the session management network element establishes two flows for the service flow, the first QoS flow may be established through the first access technology based on a split mode, and a second QoS flow may be established through a second access technology.

Because the session management network element establishes two QoS flows for the service flow in advance, and each flow corresponds to different access technologies, when the service flow data needs to move among different access technologies, the QoS flow established in advance can be directly applied, and the service flow can be switched without reestablishing the flow at the other side, so that the switching time delay is reduced.

Based on the first implementation manner of the first aspect, the present application provides a second implementation manner of the first aspect:

after the session management network element establishes QoS flow for the service flow data, the session management network element also needs to allocate bandwidth resources to the service flow data, because the traffic flow in the same QoS flow has the same traffic flow splitting mode, QoS flow information of the QoS flow can be determined according to the QoS parameters of the traffic flow, then bandwidth resources of the first QoS flow are determined according to the QoS flow information and the traffic flow splitting mode, and if the session management network element establishes two QoS flows, bandwidth resources of the first QoS flow and the second QoS flow need to be determined. The QoS flow information includes a guaranteed flow bit rate GFBR of the first QoS flow and/or the second QoS flow and a guaranteed bit rate GBR of each service flow in the QoS flow.

The session management network element determines the bandwidth resource of the first QoS flow and the bandwidth resource of the second QoS flow, so that the service flow can transmit the service flow data in the first access technology according to the first QoS flow and can also transmit the service flow data in the second access technology according to the second QoS flow, and after the resources are reserved in advance, the service flow data can be directly moved from the second network or switched to the first network, so that the switching delay is small.

Based on the second implementation manner of the first aspect, the present application provides a third implementation manner of the first aspect:

the shunting modes of the service flow are various, and when the session management network element converges QoS flows with the same shunting mode, resources can be jointly allocated to the QoS flows; when the QoS flow distribution mode is a priority-based distribution mode, a session management network element needs to determine a priority, preferentially allocate a first bandwidth resource to a QoS flow of a high-priority access technology, and then allocate a second bandwidth resource to a QoS flow of a low-priority access technology, because the transmission of a GBR service flow needs to guarantee a bandwidth, the sum of the first bandwidth resource and the second bandwidth resource allocated to the QoS flow of the GBR service flow cannot be smaller than a GFBR, where the QoS flow information further includes a maximum flow bandwidth MFBR, and optionally, the sum of the first bandwidth resource and the second bandwidth resource may also be not greater than the MFBR.

In the shunting mode, first bandwidth resources are allocated to a QoS flow corresponding to an access technology with a high priority, and then second bandwidth resources are allocated to a QoS flow corresponding to an access technology with a low priority, so that the bandwidth of service flow data in the access technology with the high priority can be guaranteed.

Based on the third implementation manner of the first aspect, the present application provides an example of the fourth implementation manner of the first aspect:

in the foregoing offloading mode based on priority, an optional scheme is that resource allocation further needs to be performed according to a network condition of an access network corresponding to an access technology, and a session management network element may obtain a current available bandwidth value in a high-priority access technology, and then allocate a first bandwidth resource to the session management network element according to the current available bandwidth value, where a guaranteed bandwidth value of the allocated first bandwidth resource is the same as the current available bandwidth value; and then adjusting the bandwidth value of the second bandwidth resource according to the guaranteed bandwidth value of the first bandwidth resource to ensure that the guaranteed bandwidth is not less than the guaranteed flow bandwidth of the QoS flow.

In the embodiment of the application, when the session management network element allocates the bandwidth resources for the QoS flows, the guaranteed bandwidth values of the two QoS flows are adjusted at any time according to the feedback of the access network, so that the stable transmission of the service flow can be guaranteed, the transmission of the service flow is prevented from being influenced by occupied bandwidth resources, and the transmission efficiency is improved.

Based on the second implementation manner of the first aspect, an embodiment of the present application further provides a fifth implementation manner of the first aspect:

if the QoS flow distribution mode is a master-slave distribution mode, the session management network element needs to determine, according to the distribution mode, master-slave relationships of access technologies corresponding to the first QoS flow and the second QoS flow, respectively; and then, firstly, bandwidth resource allocation is carried out on the first QoS flow corresponding to the main access technology, and optionally, the allocated bandwidth resource is not less than the guarantee flow bandwidth GFBR.

The embodiment of the application provides a feasible scheme for allocating first bandwidth resources and allocating second bandwidth resources, in the shunting mode, the first bandwidth resources are allocated for a first QoS flow corresponding to a main access technology, and the allocated bandwidth resources are not less than a guaranteed flow bandwidth GFBR, so that the bandwidth of service flow data in the main access technology can be guaranteed.

Based on the fifth implementation manner of the first aspect, an embodiment of the present application further provides a sixth implementation manner of the first aspect:

in the master-slave mode, the allocation of bandwidth resources also needs to be adjusted according to the network condition of the access technology, when a first bandwidth resource corresponding to the master access technology is occupied, the session management network element needs to allocate a second bandwidth resource to the slave access technology in order to guarantee normal transmission of a service stream, wherein a guaranteed bandwidth value of the allocated second bandwidth resource cannot be smaller than the GFBR.

The session management network element firstly allocates resources in the access technology corresponding to the master access technology, and when the first bandwidth resource corresponding to the master access technology is found to be occupied, the resources need to be allocated in the slave access technology, so that normal switching or moving of the service flow can be ensured, the influence on transmission of the service flow caused by the occupied bandwidth resource is avoided, and the reliability of data transmission is improved.

Based on the fifth implementation manner of the first aspect, an embodiment of the present application further provides a seventh implementation manner of the first aspect:

if the first indication information of the service flow received by the session management network element further includes a multiple access indication, in the master-slave mode, the session management network element needs to allocate resources for both the first QoS flow and the second QoS flow, where the multiple access indication is used to indicate that the session management network element allocates resources in both the first access technology and the second access technology, so that the same resources need to be allocated to both the first QoS flow and the second QoS flow.

In the embodiment of the present application, since the first indication information of the service flow has the multiple access indications, even if the first bandwidth resource of the first QoS flow is not occupied, the second bandwidth resource still needs to be allocated to the second QoS flow.

Based on the second implementation manner of the first aspect, the present application provides an eighth implementation manner of the first aspect:

when the offloading mode is the minimum round-trip time offloading mode, the session management network element needs to allocate the same bandwidth resource to the first QoS flow and the second QoS flow, so that the session management network element allocates the first bandwidth resource to the first QoS flow and allocates the second bandwidth resource to the second QoS flow, the first bandwidth resource is the same as the second bandwidth resource, and the guaranteed bandwidth values of the first bandwidth resource and the second bandwidth resource are not less than the GFBR.

Because the minimum round trip time distribution mode requires that the service flow always uses the access network corresponding to the link with the minimum RTT to transmit the service flow, the embodiment of the application reserves enough bandwidth resources in advance in both access technologies, so that the rapid switching of the service flow can be ensured.

Based on the second implementation manner of the first aspect, the present application provides a ninth implementation manner of the first aspect:

when the shunting mode of the QoS flow is a load balancing shunting mode, a session management network element needs to determine a shunting proportion of the QoS flow, determine guaranteed bandwidth values to be allocated in two access technologies according to a GFBR and the shunting proportion of the QoS flow, that is, calculate through the GFBR and the shunting proportion, determine a first reference value for allocating bandwidth resources in a first access technology and a second reference value for allocating bandwidth resources in a second access technology, allocate resources for the QoS flow according to the first reference value and the second reference value, and allocate first bandwidth resources for the first QoS flow, wherein the guaranteed bandwidth values of the first bandwidth resources need to be greater than the first reference value; allocating a second bandwidth resource for the second QoS flow, wherein the guaranteed bandwidth value of the second bandwidth resource is greater than a second reference value; optionally, a sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not greater than the maximum stream bandwidth MFBR.

The embodiment of the application provides a feasible scheme for allocating a first bandwidth resource and a second bandwidth resource, in the scheme, a guaranteed bandwidth value in the first resource and a guaranteed bandwidth value in the second resource are configured respectively, so that bandwidths of service flow data in a first access technology and a second access technology can be guaranteed.

Based on the ninth implementation manner of the first aspect, the present application provides a tenth implementation manner of the first aspect:

in the load balancing and offloading mode, the session management network element still needs to perform resource allocation according to a network condition of an access network corresponding to an access technology, and the session management network element needs to obtain a first current available bandwidth value corresponding to the first QoS flow and a second current available bandwidth value corresponding to the second QoS flow, configure the guaranteed bandwidth value of the first bandwidth resource as the first current available bandwidth value, and configure the guaranteed bandwidth value of the second bandwidth resource as the second current available bandwidth value.

In the scheme, the guaranteed bandwidth value in the first resource and the guaranteed bandwidth value in the second resource are configured according to the network condition of an access network corresponding to the access technology, so that the bandwidths of the service flow data in the first access technology and the second access technology can be guaranteed.

Based on any one of the first aspect through the tenth implementation manner of the first aspect, examples of the present application further provide an eleventh implementation manner of the first aspect:

The session management network element may further receive second indication information of a second service flow, where the second indication information also includes a splitting mode of the second service flow, and if the session management network element determines that the splitting mode of the second service flow is the same as the splitting mode of the first service flow, the session management network element binds the second service flow to a QoS flow established by the session management network element for the first service flow.

According to the embodiment of the application, a plurality of service flows in the same shunting mode can be bound into the common QoS flow, then the resource allocation is carried out on the service flows together, the QoS flow does not need to be reestablished for each service flow, and meanwhile, as the shunting modes of the service flows bound together are the same, the bandwidth resource allocation of the session management network element is facilitated.

Based on any one of the first aspect through the eleventh implementation manner of the first aspect, examples of the present application further provide a twelfth implementation manner of the first aspect:

the first indication information and/or the second indication information acquired by the session management network element have multiple access indications, and the multiple access indications indicate that the session management network element allocates resources in both access technologies.

In the solution provided in the embodiment of the present application, QoS flow needs to be established according to a multi-access indication, where the multi-access indication is used to indicate a session management network element to allocate resources for both QoS flows, and the session management network element may divide the resources based on the multi-access indication, so that service flow data can move in two access technologies conveniently.

Based on the twelfth implementation manner of the first aspect, the present application provides an example of the thirteenth implementation manner of the first aspect:

after obtaining the second indication information of the second service flow, the session management network element judges the first indication information of the first service flow and the second indication information of the second service flow, if both the two indication information contain multiple access indications, the two indication information are bound in one QoS flow, and if the first indication information contains multiple access indications, the second indication information does not contain multiple access indications, or the second indication information contains multiple access indications, and the first indication information does not contain multiple access indications, the first service flow and the second service flow need to be bound in different QoS flows.

In the scheme, if one of two service flows has a multi-access indication and the other does not have the multi-access indication, then the two service flows need to be bound into different QoS flows.

Based on any one of the first implementation manner of the first aspect to the thirteenth implementation manner of the first aspect, embodiments of the present application further provide the thirteenth implementation manner of the first aspect:

The first QoS flow and the second QoS flow established by the session management network element are the same QoS flow; in this scenario, the first access technology is a first data channel of the QoS flow, the second access technology is a second data channel of the QoS flow, that is, one QoS flow corresponds to two data channels, and then the session management network element allocates bandwidth resources to the two data channels.

In the embodiment of the application, the session management network element only needs to establish one QoS flow, and applies the QoS flow to the two data channels, so as to allocate resources in the two data channels, thereby reducing the operation of establishing the QoS flow and improving the efficiency.

A second aspect of the embodiments of the present application provides a method for data transmission, including:

a user plane network element receives service flow information sent by a session management network element, wherein the service flow information comprises a shunting mode of the service flow and QoS (quality of service) flow bandwidth resource information of the service flow, and the service flow is a GBR (guaranteed bit rate) service flow;

and the user plane network element transmits the service flow according to the shunting mode of the service flow and the bandwidth resource information of the QoS flow to which the service flow belongs.

Based on the second aspect, the embodiments of the present application further provide a first implementation manner of the second aspect:

The bandwidth resource information of the QoS flow comprises information of a first QoS flow and information of a second QoS flow, wherein the first QoS flow is the QoS flow established through a first access technology, and the second QoS flow is the QoS flow established through a second access technology; the user plane network element transmits the service flow according to the shunting mode of the service flow and the bandwidth resource information of the QoS flow to which the service flow belongs, and the method comprises the following steps:

the user plane network element determines a transmission channel for transmitting the service flow according to the shunting mode;

and the user plane network element transmits the service flow on the determined transmission channel.

Based on the first implementation manner of the second aspect, the present application provides a second implementation manner of the second aspect:

the transmission channel of the service flow comprises a first transmission channel and a second transmission channel, wherein the first transmission channel is used for transmitting the service flow belonging to the first QoS flow, and the second transmission channel is used for transmitting the service flow belonging to the second QoS flow; the bandwidth resource information includes bandwidth resources of the first transmission channel and bandwidth resources of the second transmission channel.

Based on the second implementation manner of the second aspect, the present application provides a third implementation manner of the second aspect:

When the traffic flow distribution mode is a priority-based distribution mode, the user plane network element needs to determine the priority according to the distribution mode; the user plane network element firstly determines a transmission channel of QoS flow corresponding to a high priority access technology as a transmission channel for transmitting service flow, then determines a first bandwidth resource on the transmission channel, and finally transmits the service flow on the transmission channel corresponding to the first priority by using the first bandwidth resource.

Because the session management network element allocates resources to the QoS flow corresponding to the service flow in both transmission channels, when the user plane network element performs data transmission, the data channel with high priority is selected for transmission first, and when the first bandwidth resource can ensure the normal transmission of the GBR service flow, the resource of the data channel with low priority does not need to be utilized.

Based on the third implementation manner of the second aspect, the present application provides a fourth implementation manner of the second aspect:

in the shunting mode based on the priority, the user plane network element needs to transmit the service flow on the transmission channel with the high priority, but when the first bandwidth resource of the transmission channel with the high priority is occupied, the user plane network element needs to determine the second bandwidth resource of the transmission channel corresponding to the second priority; and then transmitting the service flow on a transmission channel corresponding to a second priority by adopting the second bandwidth resource.

And when the user plane network element performs data transmission, the bandwidth resource of the data channel with high priority is occupied, and the service flow data is moved or switched to the side with low priority, so that the transmission of the GBR service flow can be ensured.

Based on the second implementation manner of the second aspect, the present application provides a fifth implementation manner of the second aspect:

when the traffic flow distribution mode is a master-slave distribution mode, the user plane network element needs to determine the master-slave relationship of the access technologies corresponding to the two QoS flows according to the distribution mode; the user plane network element firstly determines a transmission channel of QoS flow corresponding to a main access technology as a transmission channel for transmitting service flow, then determines a first bandwidth resource on the transmission channel, and finally transmits the service flow on the transmission channel corresponding to the first priority by using the first bandwidth resource.

Because the session management network element allocates resources to the QoS flow corresponding to the service flow in both transmission channels, when the user plane network element performs data transmission, the data channel corresponding to the master QoS flow is selected for transmission, and when the first bandwidth resource can ensure the normal transmission of the GBR service flow, the resource of the data channel of the slave QoS flow does not need to be utilized.

Based on the fifth implementation manner of the second aspect, the present application provides a sixth implementation manner of the second aspect:

in the master-slave shunting mode, a user plane network element needs to transmit service flow on a transmission channel corresponding to a master access technology, but when a first bandwidth resource of the transmission channel corresponding to the master access technology is occupied, the user plane network element needs to determine a second bandwidth resource of the transmission channel corresponding to a slave access technology; and then, the service flow is transmitted on a transmission channel corresponding to the slave access technology by adopting the second bandwidth resource.

And when the user plane network element performs data transmission, the bandwidth resource of the data channel corresponding to the main access technology is occupied, and the service flow data is moved or switched to one side of the slave access technology, so that the transmission of the GBR service flow can be ensured.

A third aspect of an embodiment of the present application provides a session management network element, including:

an obtaining unit, configured to obtain first indication information of a first service flow, where the first indication information includes a split mode of the first service flow, and the first service flow is a guaranteed bit rate GBR service flow;

And the processing unit is used for establishing a first QoS flow and/or a second QoS flow for transmitting the first service flow according to the first indication information.

Based on the third aspect, the embodiments of the present application further provide a first implementation manner of the third aspect:

the first QoS flow is a QoS flow established through a first access technology, and the second QoS flow is a QoS flow established through a second access technology.

Based on the first implementation manner of the third aspect, the present application provides a second implementation manner of the third aspect:

the session management network element further comprises a determining unit and an allocating unit, wherein the determining unit is configured to determine the bandwidth resource of the first QoS flow according to the traffic flow splitting mode and the QoS flow information, and/or determine the bandwidth resource of the first QoS flow according to the traffic flow splitting mode and the QoS flow information

And determining bandwidth resources of the second QoS flow according to the traffic flow distribution mode and the QoS flow information, wherein the QoS flow information comprises guaranteed flow bit rate GFBR of the first QoS flow and/or the second QoS flow and/or guaranteed bit rate GBR of the traffic flow in the QoS flow.

Based on the second implementation manner of the third aspect, the present application provides a third implementation manner of the third aspect:

The offloading mode is a priority-based offloading mode, and the QoS flow information further includes maximum flow bit rates MFBRs of the first QoS flow and the second QoS flow;

the determining unit is configured to determine that a first bandwidth resource is preferentially allocated on a first QoS flow, and a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR.

The allocating unit is configured to allocate a second bandwidth resource to the second QoS flow when the guaranteed bandwidth value of the first bandwidth resource is less than a guaranteed stream bit rate GFBR, where a sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR or not more than the MFBR.

Based on the third implementation manner of the third aspect, the present application provides a fourth implementation manner of the third aspect:

the acquiring unit is further configured to acquire a current available bandwidth value corresponding to the QoS flow of the first priority;

the allocating unit is specifically configured to allocate the first bandwidth resource according to the current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the current available bandwidth value.

Based on the second implementation manner of the third aspect, the present application provides a fifth implementation manner of the third aspect:

When the offloading mode is a master-slave offloading mode, the allocating unit is specifically configured to allocate a first bandwidth resource to the first QoS flow according to the offloading mode, where a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR.

Based on the fifth implementation manner of the third aspect, the present application provides a sixth implementation manner of the third aspect:

the allocating unit is further configured to allocate a second bandwidth resource to the second QoS flow when the first bandwidth resource corresponding to the first QoS flow is unavailable, where a guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR.

Based on the fifth implementation manner of the third aspect, the present application provides a seventh implementation manner of the third aspect:

the first indication information further comprises a multiple access indication; the multiple access indication is used to instruct the session management network element to allocate bandwidth resources in both the first access technology and the second access technology;

the allocating unit is further configured to allocate a second bandwidth resource to the second QoS flow according to the multiple access indication, where a guaranteed bandwidth value of the first bandwidth resource is the same as a guaranteed bandwidth value of the second bandwidth resource.

Based on the second implementation manner of the third aspect, the present application provides an eighth implementation manner of the third aspect:

the distribution mode is a minimum round trip time distribution mode, and the allocation unit is specifically configured to allocate a first bandwidth resource to the first QoS flow and allocate a second bandwidth resource to the second QoS flow;

the guaranteed bandwidth value of the first bandwidth resource is the same as the guaranteed bandwidth value of the second bandwidth resource; and the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource are not less than the GFBR.

Based on the second implementation manner of the third aspect, the present application provides a ninth implementation manner of the third aspect:

the shunting mode is a load balancing shunting mode, and the QoS flow information further comprises Maximum Flow Bandwidth Resources (MFBR) of the first QoS flow and the second QoS flow; the determining unit is specifically configured to determine a shunting proportion according to the load balancing shunting mode, and determine a first reference value and a second reference value according to the guaranteed stream bandwidth GFBR and the shunting proportion;

the allocating unit is specifically configured to allocate a first bandwidth resource to the first QoS flow, where a guaranteed bandwidth value of the first bandwidth resource is not less than the first reference value, and allocate a second bandwidth resource to the second QoS flow, where the guaranteed bandwidth value of the second bandwidth resource is not less than the second reference value;

Wherein a sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not less than a guaranteed stream bandwidth GFBR or not more than the maximum stream bandwidth MFBR.

Based on the ninth implementation manner of the third aspect, the present application provides a tenth implementation manner of the third aspect:

the acquiring unit is further configured to acquire a first current available bandwidth value of a first access technology corresponding to the first QoS flow and a second current available bandwidth value of a second access technology corresponding to the second QoS flow;

the allocating unit is further configured to allocate the first bandwidth resource according to the first current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the first current available bandwidth value.

The allocating unit is further configured to allocate the second bandwidth resource according to the second current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the second current available bandwidth value.

Based on any one of the third to tenth implementation manners of the third aspect, examples of the present application further provide an eleventh implementation manner of the third aspect:

The obtaining unit is further configured to obtain second indication information of a second service flow, where the second indication information includes a split mode of the second service flow;

the processing unit is further configured to bind the first service flow and the second service flow to the established QoS flow if the splitting mode of the first service flow is the same as the splitting mode of the second service flow.

Based on any one of the third to eleventh implementation manners of the third aspect, examples of the present application further provide a twelfth implementation manner of the third aspect:

the first indication information and/or the second indication information further comprises a multiple access indication for indicating that the allocation unit allocates bandwidth resources on both the first access technology and the second access technology.

Based on the twelfth implementation manner of the third aspect, the present application provides a thirteenth implementation manner of the third aspect:

the processing unit is further configured to bind the first service flow and the second service flow to different QoS flows when the first indication information or the second indication information does not include the multiple access indication.

Based on any one of the first implementation manner of the third aspect to the thirteenth implementation manner of the third aspect, the present application examples further provide a fourteenth implementation manner of the third aspect:

the first QoS flow and the second QoS flow are the same QoS flow; the first QoS flow and the second QoS flow have the same QoS flow identification QFI.

A fourth aspect of the embodiments of the present application provides a user plane network element:

a receiving unit, configured to receive service flow information sent by a session management network element, where the service flow information includes a split mode of the service flow and QoS flow bandwidth resource information of a quality of service flow to which the service flow belongs, and the service flow is a GBR service flow;

and the sending unit is used for transmitting the service flow according to the shunting mode of the service flow and the bandwidth resource information of the QoS flow to which the service flow belongs.

Based on the fourth aspect, the embodiments of the present application further provide the first implementation manner of the fourth aspect:

the bandwidth resource information of the QoS flow comprises information of a first QoS flow and information of a second QoS flow, wherein the first QoS flow is the QoS flow established through a first access technology, and the second QoS flow is the QoS flow established through a second access technology; the user plane network element further comprises a determining unit;

The determining unit is specifically configured to determine, according to the offloading mode, a transmission channel for transmitting the service flow;

the sending unit is specifically configured to transmit the service flow on the determined transmission channel.

Based on the first implementation manner of the fourth aspect, the present application provides a second implementation manner of the fourth aspect:

the transmission channels of the service flows comprise a first transmission channel and a second transmission channel, wherein the first transmission channel is used for transmitting the service flows belonging to the first QoS flow, and the second transmission channel is used for transmitting the service flows belonging to the second QoS flow; the bandwidth resource information includes bandwidth resources of the first transmission channel and bandwidth resources of the second transmission channel.

Based on the second implementation manner of the fourth aspect, the present application provides a third implementation manner of the fourth aspect:

when the offloading mode is a priority-based offloading mode, the determining unit is specifically configured to determine, according to the priority-based offloading mode, priorities of the first QoS flow and an access technology corresponding to the first QoS flow, and determine a transmission channel corresponding to the first priority as a transmission channel for transmitting the service flow, where the priorities include a first priority and a second priority, and the first priority is greater than the second priority;

The determining unit is specifically configured to determine a first bandwidth resource of a transmission channel corresponding to the first priority;

the sending unit is specifically configured to transmit the service flow on the transmission channel corresponding to the first priority by using the first bandwidth resource.

Based on the third implementation manner of the fourth aspect, the present application provides a fourth implementation manner of the fourth aspect:

the determining unit is further configured to determine, when the first bandwidth resource is occupied, a second bandwidth resource of a transmission channel corresponding to the second priority;

the sending unit is specifically configured to transmit the service stream on the transmission channel corresponding to the second priority by using the second bandwidth resource.

Based on the second implementation manner of the fourth aspect, the present application provides a fifth implementation manner of the fourth aspect:

when the offloading mode is a master-slave offloading mode, the determining unit is specifically configured to determine, according to the master-slave offloading mode, a master-slave relationship between access technologies corresponding to the first QoS flow and the second QoS flow;

the determining unit is specifically configured to determine a transmission channel corresponding to the main QoS flow as a transmission channel for transmitting the service flow;

The determining unit is specifically configured to determine a first bandwidth resource of a transmission channel corresponding to the primary QoS flow;

the sending unit is specifically configured to transmit the service flow on a transmission channel corresponding to the main QoS flow by using the first bandwidth resource.

Based on the fifth implementation manner of the fourth aspect, the present application provides a sixth implementation manner of the fourth aspect:

the determining unit is further configured to determine, when the first bandwidth resource is occupied, a second bandwidth resource of a transmission channel corresponding to the slave QoS flow by the user plane network element;

and the sending unit is further configured to transmit the service flow on the transmission channel corresponding to the slave QoS flow by using the second bandwidth resource.

A fifth aspect of the present application provides a session management network element, including: at least one processor and a memory, the memory storing computer-executable instructions executable on the processor, the policy control function network element performing the method according to the first aspect or any one of the possible implementations of the first aspect when the computer-executable instructions are executed by the processor.

A sixth aspect of the present application provides a user plane network element, including: at least one processor and a memory, the memory storing computer-executable instructions executable on the processor, the policy control function network element performing the method according to the second aspect or any one of the possible implementations of the second aspect when the computer-executable instructions are executed by the processor.

A seventh aspect of the present application provides a data transmission system, including: a session management network element device and a policy function device, where the session management network element device is the session management network element described in any one of the possible implementation manners of the third aspect to the third aspect.

An eighth aspect of the present application provides a data transmission system, including: a user plane network element device, where the user plane network element device is the user plane network element device in any one of the possible implementation manners of the fourth aspect to the fourth aspect.

A ninth aspect of the embodiments of the present application provides a computer storage medium, which is used to store computer software instructions for the session management network element or the user plane network element, and includes a program for executing the program designed for the session management network element or the user plane network element.

The session management network element may be as described in the aforementioned third aspect.

The user plane network element may be as described in the fourth aspect above.

A tenth aspect of the present application provides a chip or a chip system, where the chip or the chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform the method for data transmission described in any one of the possible implementation manners of the first aspect to the first aspect;

The communication interface in the chip may be an input/output interface, a pin, a circuit, or the like.

In one possible implementation, the chip or chip system described above in this application further comprises at least one memory having instructions stored therein. The memory may be a storage unit inside the chip, such as a register, a cache, etc., or may be a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

An eleventh aspect of the present application provides a chip or a chip system, where the chip or the chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform the method for data transmission described in any one of any possible implementation manners of the second aspect to the second aspect;

A thirteenth aspect of embodiments of the present application provides a computer program product, where the computer program product includes computer software instructions, and the computer software instructions are loadable by a processor to implement a flow in the method for data transmission of any one of the first to second aspects.

Drawings

Fig. 1 is a schematic diagram of a network architecture of a 5G network according to an embodiment of the present application;

fig. 2 is a schematic diagram of another network architecture of a 5G network according to an embodiment of the present application;

fig. 3 is a schematic diagram of another network architecture of a 5G network according to an embodiment of the present application;

fig. 4 is a schematic diagram of another network architecture of a 5G network according to an embodiment of the present application;

FIG. 5 is a schematic diagram of an embodiment of establishing a quality of service flow in an embodiment of the present application;

FIG. 6 is a schematic diagram of an embodiment of allocating resources in an embodiment of the present application;

fig. 7 is a schematic diagram of an embodiment of traffic flow transmission in the embodiment of the present application;

FIG. 8 is a diagram illustrating an embodiment of a method for data transmission according to an embodiment of the present application;

fig. 9 is a schematic diagram of an embodiment of a session management network element according to an embodiment of the present application;

fig. 10 is a schematic diagram of an embodiment of a user plane network element according to an embodiment of the present application;

Fig. 11 is a schematic diagram of another embodiment of a session management network element according to an embodiment of the present application;

fig. 12 is a schematic diagram of another embodiment of a user plane network element according to an embodiment of the present application.

Detailed Description

Fig. 1 is a schematic diagram of a network architecture of a 5G network according to the present application; fig. 2 is a schematic diagram of another network architecture of a 5G network represented by way of a server interface. The core network functions under the 5G network architecture are divided into a user plane network element function (UPF) and a control plane network element function (CP).

The User Equipment (UE), (wireless) access network (radio access network, (R) AN), User Plane Function (UPF) network element and Data Network (DN) in fig. 1 and 2 are generally called as user layer network functions or network elements, and are mainly responsible for forwarding of packet data packets, QoS control, accounting information statistics, and the like, and data traffic of a user may be transmitted through a data transmission channel established between the UE and the DN.

Wherein, the terminal equipment can include: a UE, a handheld terminal, a notebook computer, a subscriber unit (subscriber unit), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a Personal Digital Assistant (PDA) computer, a tablet computer, a wireless modem (modem), a handheld device (hand held), a laptop computer (laptop computer), a cordless telephone (cordless telephone) or a Wireless Local Loop (WLL) station, a Machine Type Communication (MTC) terminal or other network accessible devices. The UE and the access network equipment adopt a certain air interface technology to communicate with each other.

The RAN device is mainly responsible for functions of radio resource management, quality of service (QoS) management, data compression and encryption, and the like on the air interface side. The access network equipment may include various forms of base stations, such as: macro base stations, micro base stations (also referred to as small stations), relay stations, access points, etc. In systems using different radio access technologies, the names of devices with base station functionality may differ, for example, in a 5G system, referred to as a gNB.

The control plane network element function is mainly responsible for user registration authentication, mobility management, data packet forwarding strategy and QoS control strategy issued to the user plane, and is used for realizing reliable and stable transmission of user layer flow. The Session Management Function (SMF) is mainly used for user plane network element selection, user plane network element redirection, Internet Protocol (IP) address allocation, bearer establishment, modification, release, and the like; an access and mobility management function (AMF) mainly responsible for a signaling processing part, such as functions of access control, mobility management, attach and detach, network element selection, and the like; a Policy Control Function (PCF) network element, which mainly supports providing a unified policy framework to control network behavior, providing policy rules to a control layer network function, and meanwhile, is responsible for acquiring user subscription information related to policy decision. Application Function (AF) network element: mainly supports the interaction with the3rd generation partnership project (3 GPP) core network to provide services, such as influencing data routing decisions, policy control functions or providing some services of a third party to the network side. A Network Slice Selection Function (NSSF) network element, which is mainly used for network slice selection. An ausf (authentication server function) network element: mainly providing authentication and authorization functions. Unified Data Management (UDM) may be used for location management and subscription management.

In order to meet the challenge of wireless broadband technology, the 5G network architecture supports not only the wireless technology access core network side defined by the 3GPP standard group, but also the non-3GPP access technology access core network side through a non-3GPP conversion function or a next generation access gateway. As shown in fig. 3, a non-3GPP network element (non-3GPP interworking function, N3IWF) is added to a non-3GPP network architecture, which is different from a 3GPP system architecture. Including untrusted non-3GPP access network (untrusted non-3GPP access network) devices in the non-3GPP network: the network element allows the UE and the 3GPP core network to adopt non-3GPP technology for interconnection and interworking, where the non-3GPP technology is, for example: wireless fidelity (Wi-Fi), Worldwide Interoperability for Microwave Access (WiMAX), Code Division Multiple Access (CDMA) network, etc., which can directly access to a 3GPP core network with respect to a trusted non-3GPP access network device, the network element needs to be interconnected and interworked with the 3GPP core network through a secure tunnel established by a secure gateway, wherein the secure gateway is, for example: an evolved packet data gateway (ePDG) or an N3IWF network element.

Meanwhile, the 5G core network can also support credible non-3 GPP access or fixed network access; the feasible non-3 GPP network includes a trusted wlan network, and the fixed network includes a fixed home network access. The network side architecture is similar to the non-trusted non3GPP access architecture, and the non-trusted non3GPP access gateway is replaced by a trusted WLAN access gateway or a fixed network access gateway.

The 5G network architecture supports establishment of a session of a multiple access protocol data unit PDU, as shown in fig. 4, a UE may access a UPF through multiple access modes, in this embodiment of the present application, an access technology may be any one of a 3GPP access, a non3GPP access, an LTE access, a 5GRAN access, a trusted non3GPP access, an untrusted non3GPP access, a WLAN access, or a fixed access, which is not specifically limited; in the multi-access PDU session, the service flow can select different access technologies for transmission based on the protocol, thereby realizing the shunting of the service flow.

Referring to fig. 5, a schematic diagram of an embodiment of establishing a quality of service flow in an embodiment of the present application is shown. As shown in fig. 5, in a first embodiment of the method for data transmission provided in the embodiment of the present application, establishing a QoS flow for a GBR traffic flow by a session management network element includes:

501. User Equipment (UE) sends a session request to a session management network element;

in this step, the session management network element may refer to a session management function SMF network element, and when the user equipment needs a certain GBR service flow, a session request may be initiated to the core network, where the session request includes a parameter of the first service flow and UE capability indication information.

Specifically, the session request may be a PDU session establishment request initiated by the UE, or may also be a PDU session update request, that is, the UE sends a PDU session examination request or a PDU session modification request message, and the specific form is not limited. The PDU session establishment request and the PDU session update request may be sent to an access and mobility management function AMF network element by an UL NAS TRANSPORT uplink NAS TRANSPORT (UL NAS TRANSPORT) message bearer, and then forwarded to the SMF network element by the AMF network element.

The UE capability indication is a capability representation of a user equipment UE, and is used to represent that the UE has a capability of supporting split transmission of a first GBR traffic flow in a first access technology and a second access technology, and optionally, the UE supports transmission of the first GBR traffic flow in a 3GPP access network and a non-3 GPP access network. The UE capability indication information may be carried in the PDU session establishment request, the PDU session update request, or the UL NAS TRANSPORT message, and the specific form is not limited.

The first service flow is a GBR service flow requiring resource reservation in advance by the network side, and for the GBR service flow, the access network needs to reserve bandwidth resources in advance for the GBR service flow to ensure transmission of the first service flow.

502. The session management network element sends a shunting policy request to a policy function network element;

optionally, the policy function network element may be a PCF network element, and when the SMF network element receives the session request forwarded by the AMF network element, the SMF network element generates a offloading policy request according to at least one of a parameter of the first service flow and UE capability indication information included in the session request, where the offloading policy request includes at least one of a parameter of the first service flow and UE capability indication information, and is used to request the policy function network element PCF to determine and issue an offloading policy of the first service flow.

The parameter of the first service flow may be indication information related to the service quality of the first service flow, such as one of a source destination IP address, a source destination port number, a protocol type, an application identifier, and a source destination MAC address, and may further include a type of the first service flow, a requested QoS requirement, and the like, which is not limited specifically; the parameters of the first service flow are used for the second functional network element to determine the QoS parameters of the first service flow.

And the UE capability indication information is used for informing a policy function network element PCF, and the UE supports the establishment of the same quality of service flow QoS flow in both a 3GPP access network and a non-3 GPP access network.

503. A strategy function network element determines a quality of service (QoS) parameter of a first service flow;

in this embodiment, when the policy function network element PCF network element receives the offloading policy request sent by the SMF network element, the PCF network element needs to formulate a policy rule related to the first service flow according to at least one of the offloading policy request including the first service flow parameter and the UE capability indication information.

The PCF network element determines the QoS parameter of the first service flow according to the parameter of the first service flow, such as determining a 5G QoS identifier 5QI (5G QoS iidenifier) of the first service flow according to the type or flow description of the first service flow, determining an allocation and preemption priority arp (allocation and preemption priority) according to the service priority of the first service flow, determining a guaranteed bandwidth GBR value (guaranteed bitrate), a maximum bandwidth mbr (maximum bitrate) value according to the quality requirement of the first service flow, or determining the above parameters according to the requested QoS requirement, and the specific form is not limited.

504. The method comprises the steps that a strategy function network element determines first indication information of a first service flow;

The first indication information may include at least one of a QoS parameter, a split mode, and a multi-access indication of the first service flow.

Each service flow corresponds to a distribution mode, and the distribution mode may select any one of a priority-based distribution mode, a master-slave distribution mode, a minimum round trip time distribution mode, and a load balancing distribution mode, or may be other types of distribution modes, which is not limited specifically.

When the PCF network element receives the UE capability indication information, it is known that the UE has the capability of supporting the split transmission of the GBR service stream in the first access technology and the second access technology, so that a multi-access indication can be issued to the SMF network element for indicating that the session management network element SMF allocates bandwidth resources in both the first access technology and the second access technology. Illustratively, for some service flows, PCF issues a multi-access indication to SMF; for example, for a service flow a, the PCF issues a flow description of a multi-access indication and the service flow a, and the SMF reserves the same resource for the service flow a in the first access technology and the second access technology at the same time, and optionally, the SMF requests the same guaranteed bandwidth value to the access network device.

The first access technology may be a 3GPP access network, and the second access technology may be a non-3 GPP access network; it can be understood that the first access technology may be a non-3 GPP access network, and the second access technology may also be a 3GPP access network, which is not limited specifically.

505. The method comprises the steps that a policy function network element sends first indication information to a session management network element;

after determining the first indication information of the first service flow, the PCF network element sends the first indication information of the first service flow to the SMF network element.

506. And the session management network element establishes a first QoS flow and/or a second QoS flow for transmitting the first service flow according to the first indication information.

Under the 5G network architecture, QoS management of data transmission is performed based on QoS flow, and traffic data with similar QoS (e.g. with the same 5QI or ARP parameter) requirements are gathered together and transmitted as QoS flow, so the SMF network element needs to bind the same type of traffic together. For example, the QoS flow may be determined according to the related QoS parameters of the traffic flows, and the traffic flows with similar parameters are bound to one QoS flow.

Since the present embodiment needs to establish the corresponding QoS flows for the service flows in both the first access technology and the second access technology, the splitting modes of the service flows bound together need to be consistent, that is, the QoS flows need to be established according to the splitting mode.

In an alternative embodiment, the first QoS flow is a QoS flow established through a first access technology, and the second QoS flow may be a QoS flow established through a second access technology.

For example, a first QoS flow established by the SMF network element is for the first access technology and a second QoS flow is for the second access technology. The SMF network element may establish a first QoS flow for the first traffic flow, so that the SMF network element may be applied to two access technologies, and may also establish two QoS flows for the first traffic flow, where the first QoS flow corresponds to the first access technology and the second QoS flow corresponds to the second access technology.

In an optional embodiment, a session management network element obtains second indication information of a second service flow, where the second indication information includes a split mode of the second service flow; and if the shunting mode of the first service flow is the same as that of the second service flow, the session management network element binds the first service flow and the second service flow to the established QoS flow.

For example, the SMF network element determines whether the traffic flows are the same type of traffic flows according to the received traffic flow 1 and the received traffic flow 2 and according to the 5QI of the traffic flow 1 and the traffic flow 2, determines whether the split modes of the traffic flow 1 and the traffic flow 2 are the same after the 5QI and ARP parameters of the traffic flow 1 and the traffic flow 2 are the same, and binds the traffic flow 2 to the QoS flow of the traffic flow 1 if the split modes are the same. Optionally, the shunting mode may be determined in advance, then whether there is a multiple access indication is determined, and finally whether the 5QI or ARP parameters are the same is determined, and the determination sequence is not limited.

Therefore, a plurality of service flows with the same shunting mode can be bound into a common QoS flow, then resource allocation is carried out on the service flows together, the QoS flow does not need to be reestablished for each service flow, and meanwhile, as the shunting modes of the service flows bound together are the same, bandwidth resources are conveniently allocated to the session management network element.

In an optional embodiment, whether the first service flow is bound may also be determined according to a multiple access indication of the second service flow, where the first indication information of the first service flow includes the multiple access indication, and if the second indication information of the second service flow acquired by the session management network element does not include the multiple access indication, the session management network element binds the first service flow and the second service flow to different QoS flows.

If one of the two service flows has a multi-access indication and the other does not have the multi-access indication, the two service flows need to be bound into different QoS flows, and because the session management network element commonly allocates resources through the QoS flows, the service flows need to be bound together in the same mode and have the multi-access indications.

In the technical scheme provided by the application, after receiving first indication information of a service flow, a session management network element establishes a guaranteed bit rate quality of service (GBR QoS) flow according to a splitting mode in the first indication information, and since the session management network element establishes the GBR QoS flow in a first access technology and a second access technology respectively, the service flow data can correspond to the first access technology, the second access technology, or both the first access technology and the second access technology. When the traffic flow data needs to be moved or switched for some reason, the GBR QoS flow does not need to be established for the traffic flow again, the traffic flow data can be directly moved from the first access technology to the second access technology, or the traffic flow data can be directly moved from the second access technology to the first access technology, wherein the movement form can be various, such as transfer, switching, and the like, and thus, the switching delay is small.

In the first embodiment, after establishing the GBR QoS flow for the traffic flow, the session management network element needs to allocate resources to the first QoS flow and the second QoS flow, and a process of allocating resources based on a split mode by the session management network element will be specifically described below.

Referring to fig. 6, a schematic diagram of an embodiment of allocating resources according to the present application is shown. As shown in fig. 6, in a second embodiment of the method for data transmission provided in the embodiment of the present application, allocating resources for GBR QoS flow by a session management network element includes:

601. the session management network element determines the bandwidth resource of the first QoS flow according to the flow distribution mode of the service flow and the QoS flow information;

after the SMF network element establishes the first QoS flow and the second QoS flow, it needs to apply for bandwidth resources from the access technologies on both sides to ensure the transmission of the service flow. Specifically, the SMF network element needs to determine an application method according to a offloading policy, for example, in a offloading mode based on priority, it needs to determine which access network to apply for a resource to first; in the load balancing offload mode, it is necessary to determine how many resources should be applied to each side. Then, according to the determined application strategy, a QoS request can be directly sent to the access network element, and after the access network element receives the QoS request, resources are reserved for the access network element according to the requirements of the SMF network element and the reservation condition is fed back to the SMF network element.

Specifically, the SMF network element determines, through the offload mode and the QoS flow information, a QoS parameter specifically requested by each access technology side, such as a guaranteed bandwidth value of a bandwidth resource, for example, a guaranteed bandwidth value allocated by a specific 3GPP access side or non3GPP access side is determined according to a guaranteed flow bandwidth GFBR in the QoS flow information.

602. And the session management network element determines the bandwidth resource of the second QoS flow according to the traffic flow distribution mode and the QoS flow information.

After the session management network element establishes the second QoS flow for the service flow, it needs to determine the bandwidth resource of the second QoS flow according to the split mode and the guaranteed flow bandwidth GFBR of the second QoS flow. The specific determination method is similar to the determination of the bandwidth resource of the first QoS flow in step 601, and is not described herein again.

603. The session management network element allocates bandwidth resources for the first QoS flow in a first access technology;

after determining the bandwidth resources of the QoS flow, the session management network element allocates the bandwidth resources to the QoS flow in the access technology corresponding to the first QoS flow, and allocates the bandwidth resources to the QoS flow in the access technology corresponding to the second QoS flow. To provide guaranteed bandwidth for GBR traffic flows.

604, the session management network element allocates bandwidth resources for the second QoS flow in a second access technology;

Step 604 is similar to step 603, and is described in detail herein, it is understood that step 603 and step 604 do not have a time sequence, and are not limited specifically.

605. The first access technology sends a first current available bandwidth value to a session management network element;

after the session management network element allocates resources in the access technology, different access technologies need to reserve resources according to the network condition of the current access network, and the access network needs to first obtain the current available bandwidth value and feed back the available bandwidth value to the session management network element, so that the session management network element can adjust the allocated resources in time and ensure the normal transmission of service flows.

606. The second access technology sends a second current available bandwidth value to the session management network element;

this step is similar to step 605, that is, the session management network element needs to allocate resources in two access technologies, and each access technology needs to feed back the current available bandwidth value. It is to be understood that steps 604 and 605 are not in a sequential order, and the first access technology may first transmit the first currently available bandwidth value, or the second access technology may first transmit the second currently available bandwidth value, which is not limited in particular.

607. And the session management network element adjusts the bandwidth resources of the first QoS flow and the bandwidth resources of the second QoS flow.

The session management network element may adjust the allocated resources according to the current first available bandwidth value and the second available bandwidth value, so as to adapt to the network condition of the current access network.

608. The session management network element sends QoS flow bandwidth resource information corresponding to the service flow to the user equipment UE and the user plane network element;

after the session management network element allocates the bandwidth resource, it needs to send the configured QoS flow bandwidth resource information to the UE and the user plane network element, so that the UE and the user plane network element transmit the traffic flow data by using the allocated bandwidth resource information.

In a specific embodiment, when a service flow corresponds to a QoS flow, the session management network element may generate a corresponding relationship between the service flow description and a QoS flow identifier (e.g., identifier QFI1 of the first QoS flow), or/and generate a corresponding relationship between an access technology identifier and a guaranteed bandwidth value; the QoS flow is established on both 3GPP and non3GPP sides. The corresponding relation is used for indicating the UE to select the access technology for the service flow data packet to transmit. For example, the shunting mode indicates that a data packet is transmitted through the 3GPP side, and the guaranteed bandwidth value of the first QoS flow at the 3GPP side meets the QoS requirement of the service flow, the UE sends the data packet to the first QoS flow at the 3GPP side for transmission; and if the guaranteed bandwidth resources of the first QoS flow at the 3GPP side cannot meet the QoS requirements of the service flow, the UE sends the data packet to the first QoS flow at the non3GPP side for transmission.

In the following, how to determine and allocate the bandwidth resources of QoS flow in different offloading modes is specifically described.

When the QFI of the first QoS flow is the same as that of the second QoS flow, namely the first QoS flow and the second QoS flow are the same QoS flow, a session management network element determines a guaranteed flow bandwidth GFBR value and a maximum flow bandwidth MFBR value of the QoS flow according to QoS parameters; optionally, the GBR values of all the service flows may be added, and the obtained sum is used as a GFBR value of the guaranteed stream bandwidth; and adding the MBR values of all the service flows to obtain a sum serving as a maximum flow bandwidth MFBR value, or determining a preset difference range, determining a guaranteed flow bandwidth GFBR value according to the sum of the GBR values of all the service flows and the difference range, and determining the maximum flow bandwidth MFBR value according to the sum of the MBR values of all the service flows and the difference range.

In a first optional implementation manner, when the offloading mode is a priority-based offloading mode, a session management network element first determines priorities of a 3GPP access network and the non-3 GPP access network; and then applying for a first bandwidth resource at the access network with the first priority, and then applying for a second bandwidth resource at the access network with the second priority, wherein the first priority is greater than the second priority, and the sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR value and not greater than the MFBR value.

In this mode, the service flow is required to transmit the data packet preferentially through the access technology of one side, and when the resource of the side is insufficient, other service data packets are sent through the other side. Therefore, the SMF reserves the guaranteed bandwidth resource on the high priority side first, and reserves the extra bandwidth resource on the low priority side.

Illustratively, when the first access technology indicated by the priority offload mode is high priority, the session management network element allocates a guaranteed bandwidth value GFBR1 of the first bandwidth resource for the first QoS flow based on the priority offload mode, GFBR1 is a value greater than 0 and less than or equal to GFBR, and then may allocate a guaranteed bandwidth value GFBR2 of the second bandwidth resource for the second QoS flow, GFBR2 may be greater than or equal to 0 and less than or equal to a value of MFBR minus a GFBR1 difference. Wherein a sum of the bandwidth value GFBR1 of the first bandwidth resource and the bandwidth value GFBR2 of the second bandwidth resource is not less than the GFBR or not more than the MFBR.

Illustratively, when the SMF network element determines that the priority of the 3GPP access network is high according to the split mode, it first applies for bandwidth resources to the 3GPP access network, and if the 3GPP access network cannot meet the requirement, it then applies for second bandwidth resources to the non-3 GPP access network, as long as it is ensured that the sum of the bandwidth resources reserved on both sides meets the requirement of guaranteeing the stream bandwidth GFBR.

For example, service flow1, service flow 2, and service flow 3 converge to a Qos flow, where the QFI value of the Qos flow is 1; the SMF network element firstly determines that the GBR value of the service flow1 is 2Mbps, the GBR value of the service flow 2 is 5Mbps, and the GBR value of the service flow 3 is 5Mbps, then the GBR values of the service flows are added to obtain the GFBR value of Qos flow1 which is 12 Mbps; and then, determining that the priority of the 3GPP access network is higher than that of the non-3 GPP access network according to the shunting mode, and then the SMF network element firstly applies for bandwidth resources from the 3GPP access network. If the bandwidth resource which can be provided by the 3GPP access network for the Qos flow1 is 6Mbps according to the feedback of the 3GPP access network, the non-3 GPP access network at least reserves the bandwidth resource of 6Mbps for the Qos flow 1; if the MFBR value of Qos flow1 is 20Mbps, the non-3 GPP access network reserves bandwidth resources of 14Mbps to Qos flow1 at most.

In a second optional implementation manner, when the offloading mode is a master-slave offloading mode, the session management network element needs to first determine a master-slave relationship between two QoS flows for different access technologies, apply for a first bandwidth resource in an access network corresponding to the master QoS flow, and apply for a second bandwidth resource in an access network corresponding to the slave QoS flow, where a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR.

Illustratively, when the first access technology indicated by the offloading mode is primary, the session management network element determines, according to the offloading mode, that a guaranteed bandwidth value GFBR1 of a first bandwidth resource allocated to the first QoS flow is not less than a GFBR, and a guaranteed bandwidth value GFBR2 of a second bandwidth resource allocated to the second QoS flow is equal to 0 or equal to the GFBR. And when the first bandwidth resource corresponding to the first QoS flow is unavailable, the session management network element updates a second bandwidth resource allocated by a second QoS flow, wherein a guaranteed bandwidth value of the updated second bandwidth resource is not less than the GFBR.

And if the first bandwidth resource corresponding to the master QoS flow is unavailable, the session management network element needs to allocate a second bandwidth resource to the slave QoS flow according to feedback of an access network, wherein the guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR.

If the service flows in the QoS flow all have multiple access indications, then bandwidth resources need to be applied both in the access network corresponding to the master QoS flow and the access network corresponding to the slave QoS flow, and the bandwidth resources applied on both sides need to ensure normal transmission of the service flows, that is, the bandwidth values of the first bandwidth resource and the second bandwidth resource are the same and not less than the guaranteed flow bandwidth.

And in the master-slave flow distribution mode, the service flow is required to be transmitted through one side preferentially, and when one side is unavailable, the service flow is switched to the other side for transmission integrally, so that the SMF network element needs to reserve sufficient resources in the access network corresponding to the master QoS flow to ensure the normal transmission of the service flow, and when the access network corresponding to the master QoS flow cannot provide corresponding bandwidth resources, the bandwidth resources need to be reserved in the slave QoS flow to ensure the rapid switching of the service flow.

For example, service flow1, service flow 2, and service flow 3 converge to a Qos flow, where the QFI value of the Qos flow is 1; firstly, the SMF network element determines that the GFBR value of Qos flow1 is 12Mbps and the MFBR value is 20 Mbps; and then the SMF network element needs to judge the master-slave relationship between the 3GPP access network and the non-3 GPP access network, and if the 3GPP access network is the access network corresponding to the main Qos flow, the first bandwidth resource provided by the SMF network element for the 3GPP access network in the 3GPP access network is between 12Mbps and 20 Mbps.

If it is known from the feedback of the 3GPP access network that the first bandwidth resource corresponding to the 3GPP access network is already occupied, then the bandwidth resource needs to be allocated in the non-3 GPP access network, and the second bandwidth resource provided by the SMF network element in the non-3 GPP access network should also be between 12Mbps and 20Mbps, so as to ensure the complete switching of the service flow.

If there is a multi-access indication in the indication information of the service flow in the Qos flow1, resources need to be reserved in both the 3GPP access network and the non-3 GPP access network, and the resources reserved on both sides are the same and are both between 12Mbps and 20 Mbps.

In a third embodiment, when the offloading mode is the minimum round-trip time offloading mode, the session management network element allocates a first bandwidth resource in the 3GPP access network and allocates a second bandwidth resource in the non-3 GPP access network; the guaranteed bandwidth value of the first bandwidth resource is the same as the guaranteed bandwidth value of the second bandwidth resource; and the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource are not less than the GFBR value and not more than the MFBR value.

And a minimum round trip time distribution mode, wherein the mode requires that the service flow always uses the access network corresponding to the link with the minimum RTT to transmit the service flow. Therefore, the SMF network element needs to reserve the same bandwidth resource in the 3GPP access network and the non-3 GPP access network, so as to ensure fast switching of the service flow.

In the fourth embodiment, when the offloading mode is the load balancing offloading mode, the session management network element first determines an offloading proportion of a service flow; then, determining a first reference value and a second reference value according to the GFBR value and the shunt ratio of the guaranteed stream bandwidth; a session management network element allocates a first bandwidth resource in a 3GPP access network, wherein a guaranteed bandwidth value of the first bandwidth resource is greater than a first reference value; a session management network element allocates a second bandwidth resource in a non-3 GPP access network, wherein a guaranteed bandwidth value of the second bandwidth resource is greater than the second reference value; wherein a sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not greater than the maximum stream bandwidth MFBR value.

In the load balancing and shunting mode, the service flow is required to be simultaneously transmitted in the 3GPP access network and the non-3 GPP access network according to the proportion, so that the SMF network element needs to allocate corresponding bandwidth resources on both sides based on the shunting proportion to ensure the normal transmission of the service flow.

For example, when the flow rate of the QoS after service flow aggregation is the same, the split mode of each service flow indicates that the split ratio of the 3GPP access network to the non-3 GPP access network is 1: 4; then, the SMF network element first determines that the GFBR value of the QoS flow is 10Mbps, and then calculates that at least 2Mbps of bandwidth resources need to be reserved in the 3GPP access network, and at least 8Mbps of bandwidth resources need to be reserved on the non-3 GPP side.

If the split ratios of the multiple service flows contained in the QoS flow are different, the reserved bandwidth value of each side may be the sum of the bandwidths required by each service flow at the side; specifically, if the QoS flow after service flow aggregation includes service flow 1, service flow 2, and service flow 3; the guaranteed bandwidth GBR value of the service flow 1 is 10Mbps, and the shunting proportion is 1: 4, the guaranteed bandwidth GBR value of the service flow 2 is 12Mbps, and the shunting proportion is 3: 1, the guaranteed bandwidth GBR value of the service flow 3 is 9Mbps, and the shunting proportion is 1: 2, it can be determined that the GFBR value of the QoS flow is 31Mbps, bandwidth resources 2Mbps are required to be reserved for the service flow 1, 9Mbps is reserved for the service flow 2, and 3Mbps is reserved for the service flow 3 in the 3GPP access network; in a non-3 GPP access network, bandwidth resources of 8Mbps need to be reserved for a service flow 1, 3Mbps needs to be reserved for a service flow 2, and 6Mbps needs to be reserved for a service flow 3; that is, at least 14Mbps bandwidth resource is reserved in the 3GPP access network for the QoS flow, and at least 17Mbps bandwidth resource is reserved in the non-3 GPP access network.

In a fifth optional implementation, when the service flow 1 is bound to two QoS flows, the split mode may also be a redundant transmission indication; the redundant transmission indication is used for indicating SMF, the service flow data needs to be transmitted on a continuous QoS flow at the same time, and the SMF network element can allocate a first bandwidth resource in a 3GPP access network and allocate a second bandwidth resource in a non-3 GPP access network according to the redundant transmission indication; the guaranteed bandwidth value of the first bandwidth resource is the same as the guaranteed bandwidth value of the second bandwidth resource; and the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource are not less than the GFBR value.

The split mode of redundant transmission requires the traffic flow to transmit simultaneously in the access networks on both sides. Therefore, the SMF network element needs to reserve the same bandwidth resource in the 3GPP access network and the non-3 GPP access network, so as to ensure fast switching of the service flow.

And (II) when the QFIs of the first QoS flow and the second QoS flow are different, namely the first QoS flow and the second QoS flow are not the same QoS flow, the same service flow belongs to two QoS flows, and the service flows contained in the first QoS flow and the second QoS flow are overlapped but not completely the same. For example, the QFI value of the first Qos flow is 1, and Qos flow 1 is applied to a 3GPP access network, including service flow 1, service flow 2, and service flow 3; the QFI value of the second Qos flow is 2, and Qos flow 2 is applied to the non-3 GPP access network and includes service flow 1, service flow 4, and service flow 5.

For the service flow 1, it is bound in different Qos flow, and since the service flows in the Qos flow have the same distribution mode, it may determine the bandwidth resources required by the service flow 1, the service flow 2, and the service flow 3 in the 3GPP access network, determine the bandwidth resources required by the service flow 1, the service flow 4, and the service flow 5 in the non-3 GPP access network, then calculate the GFBR value and the MFBR value of the Qos flow 1 and the Qos flow 2, respectively, and apply for resource reservation in the corresponding access networks, respectively.

In the technical solution provided by the present application, after receiving first indication information of a service flow, a session management network element establishes a guaranteed flow bit rate quality of service (GBR QoS) flow according to a splitting mode in the first indication information, and since the session management network element establishes the GBR QoS flow in a first access technology and a second access technology, the service flow data may be transmitted in the first access technology, the second access technology, or both the first access technology and the second access technology. When the traffic flow data needs to be moved or switched for some reason, the GBR QoS flow does not need to be established for the traffic flow again, and the traffic flow data can be directly moved or switched from the first access technology to the second access technology, or directly moved or switched from the second access technology to the first access technology, so that the switching delay is small.

After the session management network element allocates resources for its GBR QoS flow, bandwidth resource information related to the service flow is sent to the user equipment and the user plane network element, and then the user equipment and the user plane network element transmit the service flow according to the allocated resources, and the process of the user plane network element transmitting the service flow based on the split mode will be specifically described below.

Referring to fig. 7, a schematic diagram of an embodiment of traffic flow transmission in the embodiment of the present application is shown. As shown in fig. 7, in a third embodiment of the method for data transmission provided in the embodiment of the present application, the transmitting, by a user plane network element, traffic flow data includes:

701. the session management network element establishes service flow information;

the SMF network element establishes service flow information according to the allocation condition of bandwidth resources in a 3GPP access network and a non-3 GPP access network, wherein the service flow information comprises a shunting mode of the service flow and QoS flow bandwidth resource information of the service flow.

In an optional embodiment, after the SMF network element allocates the bandwidth resources in the 3GPP access network and the non-3 GPP access network, the corresponding relationship among the QFI, the transmission tunnel, and the bandwidth value may be generated according to the resource allocation situation of the 3GPP access network and the non-3 GPP access network, and then the corresponding relationship is sent to the UPF network element, so as to establish the connection between the UPF network element and the access network, and perform data transmission; in addition, the correspondence may also be at least one of pairwise parameter correspondence, specifically including a correspondence between QFI and a transmission tunnel, a correspondence between a transmission tunnel and a bandwidth value, and a correspondence between QFI and a bandwidth value.

702. The session management network element sends service flow information to the user plane network element;

the user plane network element may be a user plane function UPF network element, and after the SMF network element establishes the above-mentioned correspondence, the SMF network element sends the correspondence to an UPF network element that is an execution subject of service stream transmission, and the UPF network element establishes a connection with the access network according to an instruction of the service stream information, and supports service stream data transmission.

703. The user plane network element determines a transmission channel for transmitting the service flow according to the shunting strategy;

after receiving service flow information sent by the SMF network element, the UPF network element determines a first transmission channel corresponding to a first QFI value of a first QoS flow according to a service flow included in the service flow information, a QFI value of the QoS flow and a corresponding relation table of the transmission channel, wherein the first transmission channel is applied to a 3GPP access network; and determining a second transmission channel corresponding to a second QFI value of a second QoS flow, wherein the second transmission channel is applied to the non-3 GPP access network.

And simultaneously, selecting a transmission channel for transmitting the service flow according to the shunting mode.

704. The user plane network element transmits the service flow on the determined transmission channel;

when the UPF network element and the access networks on both sides establish a connection, the transmission of the service stream data is started, specifically, the UPF network element further needs to determine a transmission policy according to the offloading policy, that is, which data channel the service stream data packet is transmitted in, or the transmission time on each transmission channel, and then transmit the service stream according to the selected data channel or/and the transmission time.

In another embodiment of the present invention, the user plane network element in step 703 determines a transmission channel for transmitting the service stream according to the split mode, and there are also multiple implementation manners; the UPF needs to determine a transmission mode according to a splitting mode in the splitting policy, determine a transmission channel specifically used for transmitting a service stream in the first transmission channel and the second transmission channel, and then transmit the service stream on the transmission channel.

In a first optional implementation manner, when the offloading mode is a priority-based offloading mode, the user plane network element first determines priorities of the first transmission channel and the second transmission channel; the user plane network element transmits the service flow on a transmission channel corresponding to the first priority; when the transmission channel corresponding to the first priority is occupied (that is, when no more data packets can be transmitted), the user plane network element transmits the service flow on the transmission channel corresponding to the second priority; wherein the first priority is greater than the second priority.

For example, the QFI value of the QoS flow corresponding to the service flow 1 is 1, the transmission channels corresponding to the QFI are a tunnel 1 and a tunnel 3, the tunnel 1 is on the 3GPP access network side, and the tunnel 3 is on the non-3 GPP access network side; when the UPF network element transmits the service flow 1, the priority of the 3GPP access network and the priority of the non-3 GPP access network are judged according to the shunting mode, when the priority of the 3GPP access network is higher than that of the non-3 GPP access network, namely the priority of the tunnel 1 is higher than that of the tunnel 3, the UPF network element transmits the service flow in the tunnel 1, and when the resources of the tunnel 1 are full, the subsequent data of the service flow can be transmitted in the tunnel 3.

For example, service flow 1 corresponds to two QoS flows, the QFI values of which are 1 and 2, the transmission channel corresponding to QFI 1 is tunnel 4, the transmission channel corresponding to QFI 2 is tunnel 5, tunnel 4 is on the 3GPP access network side, and tunnel 5 is on the non-3 GPP access network side; when the UPF network element transmits the service flow 1, the priority of the 3GPP access network and the priority of the non-3 GPP access network are determined according to the split mode, when the priority of the 3GPP access network is higher than that of the non-3 GPP access network, that is, the priority of the tunnel 4 is higher than that of the tunnel 5, the UPF network element transmits the service flow in the tunnel 4 first, and when the resources of the tunnel 4 are occupied, the subsequent data of the service flow can be transmitted in the tunnel 5.

In a second optional implementation manner, when the splitting mode is a master-slave splitting mode, a user plane network element first determines a master-slave relationship between the first transmission channel and the second transmission channel; then the user plane network element transmits the service flow on the main transmission channel; and when the resources of the main transmission channel are unavailable, the user plane network element switches all the service flows to the auxiliary transmission channel for transmission.

For example, the QFI value of the QoS flow corresponding to the service flow 1 is 1, the transmission channels corresponding to the QFI are a tunnel 1 and a tunnel 3, the tunnel 1 is on the 3GPP access network side, and the tunnel 3 is on the non-3 GPP access network side; when the UPF network element transmits the service flow 1, the master-slave relationship between the 3GPP access network and the non-3 GPP access network is judged according to the shunting mode, when the 3GPP access network is the main access network, namely the tunnel 1 is the main transmission channel, the UPF network element transmits the service flow at the tunnel 1, and when the tunnel 1 resource is unavailable, the UPF network element is switched to the tunnel 3 to transmit the service flow.

For example, service flow 1 corresponds to two QoS flows, the QFI values of which are 1 and 2, the transmission channel corresponding to QFI 1 is tunnel 4, the transmission channel corresponding to QFI 2 is tunnel 5, tunnel 4 is on the 3GPP access network side, and tunnel 5 is on the non-3 GPP access network side; when the UPF network element transmits the service flow 1, the master-slave relationship between the 3GPP access network and the non-3 GPP access network is judged according to the shunting mode, when the 3GPP access network is the main access network, namely the tunnel 4 is the main transmission channel, the UPF network element transmits the service flow at the tunnel 4, and when the tunnel 4 resource is unavailable, the UPF network element is switched to the tunnel 5 to transmit the service flow.

In a third optional implementation manner, when the split mode is the minimum round trip time split mode, the user plane network element determines round trip times of the first transmission channel and the second transmission channel; and the user plane network element transmits the service flow on the transmission channel with the minimum round-trip time.

For example, the QFI value of the QoS flow corresponding to the service flow 1 is 1, the transmission channels corresponding to the QFI are a tunnel 1 and a tunnel 3, the tunnel 1 is on the 3GPP access network side, and the tunnel 3 is on the non-3 GPP access network side; when the UPF network element transmits the service flow 1, judging the round trip time of the tunnel 1 and the tunnel 3 according to the shunting mode, when the round trip time of the tunnel 1 is the minimum, the UPF network element transmits the service flow at the tunnel 1, and when the round trip time of the tunnel 3 is less than the round trip time of the tunnel 1, the UPF network element switches to the tunnel 3 to transmit the service flow.

For example, service flow 1 corresponds to two QoS flows, the QFI values of which are 1 and 2, the transmission channel corresponding to QFI 1 is tunnel 4, the transmission channel corresponding to QFI 2 is tunnel 5, tunnel 4 is on the 3GPP access network side, and tunnel 5 is on the non-3 GPP access network side; when the UPF network element transmits the service flow 1, the round-trip time of the tunnel 4 and the tunnel 5 is judged according to the split mode, when the round-trip time of the tunnel 4 is the minimum, the UPF network element transmits the service flow at the tunnel 4, and when the round-trip time of the tunnel 5 is smaller than the round-trip time of the tunnel 4, the UPF network element switches to the tunnel 5 to transmit the service flow.

In a fourth optional implementation manner, when the offloading mode is a load balancing offloading mode, the user plane network element transmits the service flows on the first transmission channel and the second transmission channel simultaneously according to the load balancing offloading mode.

In the fifth optional implementation, when the service flow 1 is bound to two QoS flows, the split mode may also be a redundant transmission indication; the redundant transmission indication may be a simultaneous transmission indication related to QoS flow, and the user plane network element transmits the same traffic stream data packet on the first transmission channel and the second transmission channel simultaneously according to the redundant transmission indication;

for example, a service flow 1 corresponds to two QoS flows, the QFI values of which are 1 and 2, a transmission channel corresponding to QFI 1 is a tunnel 4, a transmission channel corresponding to QFI 2 is a tunnel 5, the tunnel 4 is on the 3GPP access network side, the tunnel 5 is on the non-3 GPP access network side, and a UPF network element transmits the same service flow data packet on the tunnel 4 and the tunnel 5 at the same time according to the received redundant transmission indication.

In the embodiment of the present invention, the session management network element allocates resources to the QoS flow corresponding to the service flow in both transmission channels, and the user plane network element terminal device can both obtain information that the session management network element allocates resources to the GBR QoS flow for the first network and the second network, so as to instruct the user plane network element and the terminal device to switch or move the service flow data corresponding to the GBR QoS flow.

Referring to fig. 8, a schematic diagram of an embodiment of data transmission in the embodiment of the present application is shown. As shown in fig. 8, in a fourth embodiment of the method for data transmission provided in the embodiment of the present application, the method includes:

801. user Equipment (UE) sends a session request to a session management network element;

802. the session management network element sends a shunting policy request to a policy function network element;

it is understood that step 801 is similar to step 501 and step 802 is similar to step 502 in the first embodiment, and the description thereof is omitted here.

803. The method comprises the steps that a strategy function network element determines first indication information of a first service flow;

804. The policy function network element sends first indication information to a session management network element;

wherein the first indication information may include at least one of a QoS parameter, a split mode, and a multi-access indication of the first traffic flow.

Each service flow corresponds to a splitting mode, and the splitting mode may select any one of a priority-based splitting mode, a master-slave splitting mode, a minimum round trip time splitting mode, a load balancing splitting mode, or a redundant transmission mode, or may be another type of splitting mode, which is not limited specifically.

When the PCF network element receives the UE capability indication information, it is known that the UE has the capability of supporting the split transmission of the GBR service stream in the first access technology and the second access technology, so that a multi-access indication can be issued to the SMF network element for indicating that the session management network element SMF allocates bandwidth resources in both the first access technology and the second access technology. In the embodiment, aiming at some service flows, PCF sends service flow description and multi-access indication to SMF; for example, for service flow a, the PCF issues a multi-access indication and the flow description of service flow a, and the SMF reserves the same bandwidth resources for service flow a in both the first access technology and the second access technology.

805. The session management network element establishes a first QoS flow and a second QoS flow according to the first indication information;

it can be understood that the specific method for establishing the first QoS flow and the second QoS flow in step 805 is similar to the method in step 506 in the first embodiment, and details are not described herein.

806. The session management network element allocates resources for the first QoS flow and the second QoS flow;

after the session management network element establishes the first QoS flow and the second QoS flow, it needs to allocate resources to the session management network element according to the offloading mode and the QoS flow information.

807. The session management network element sends bandwidth resource information of QoS flow to the user equipment and the user plane network element;

after the session management network element allocates the bandwidth resources to the first QoS flow and the second QoS flow, the session management network element needs to notify the user plane network element and the user equipment of the resource allocation situation, so that the session management network element transmits the traffic flow data by using the allocated resources.

Specifically, when a service flow corresponds to two QoS flow, the session management network element may generate a corresponding relationship with two QoS flow identifiers (QFI1 and QFI2) according to the service flow description, or/and generate a corresponding relationship between a QoS flow identifier and a guaranteed bandwidth value; the corresponding relation is used for the UE to select QoS flow transmission for the service flow data packet. For example, the offloading mode indicates that the data packet is transmitted through the 3GPP side, and the guaranteed bandwidth value of the first QoS flow meets the QoS requirement of the service flow, the UE sends the data packet to the 3GPP side for transmission corresponding to the first QoS flow. Otherwise, when the guaranteed bandwidth value of the first QoS flow cannot meet the QoS requirement of the service flow, the UE sends the data packet to a second QoS flow corresponding to the non3GPP side for transmission.

In addition, the session management network element may further generate a correspondence between the service flow description and two tunnel identifiers (a 3 GPP-side tunnel identifier and a non3 GPP-side tunnel identifier), or/and a correspondence between the tunnel identifiers and guaranteed bandwidth values. And enabling the UPF to select corresponding tunnel transmission for the service flow data packet based on at least one of the split mode and the resource reservation bandwidth value. For example, if the split mode indicates that the data packet is transmitted through the 3GPP and the guaranteed bandwidth value of the user plane tunnel on the 3GPP side meets the QoS requirement of the service flow, the UE sends the data packet to the user plane tunnel on the 3GPP side. Otherwise, if the guaranteed bandwidth value of the user plane tunnel at the 3GPP side cannot meet the QoS requirement of the service flow, the UE sends the data packet to the user plane tunnel at the non3GPP side.

808. The user plane network element determines a transmission channel for transmitting the service flow according to the bandwidth resource information;

it can be understood that this step is similar to step 703 in the third embodiment, for example, in a priority-based mode, the transmission channel corresponding to the high-priority QoS flow may be determined as a transmission channel for transmitting the service flow, or the transmission channel corresponding to the low-priority QoS flow may be determined as a channel for transmitting the additional data packet of the service flow when the transmission channel corresponding to the high-priority QoS flow is occupied, which is not described in detail herein.

809. The user plane network element transmits the service flow on the determined transmission channel;

when the user plane network element determines a good transmission channel, the allocated bandwidth resource can be used for transmitting the service flow data.

Referring to fig. 9, an embodiment of a session management network element according to an embodiment of the present application is shown. As shown in fig. 8, an embodiment of the present application provides an embodiment of a session management network element, including

An obtaining unit 901, configured to obtain first indication information of a first service flow, where the first indication information includes a split mode of the first service flow, and the first service flow is a guaranteed bandwidth GBR service flow;

a processing unit 902, configured to establish a first quality of service flow QoS flow and/or a second QoS flow for transmitting the first service flow according to the first indication information.

In another embodiment of the network element with session management function provided in the embodiments of the present application, the first QoS flow is a QoS flow established through a first access technology, and the second QoS flow is a QoS flow established through a second access technology.

In another embodiment of the network element with session management function provided in the embodiment of the present application, the session management network element further includes a determining unit 903 and an allocating unit 904, where the determining unit 903 is configured to determine, according to the offloading mode of the service flow and the QoS flow information, a bandwidth resource of the first QoS flow, and/or determine, according to the offloading mode of the service flow and the QoS flow information, a bandwidth resource of the first QoS flow

And determining bandwidth resources of the second QoS flow according to the traffic flow distribution mode and the QoS flow information, wherein the QoS flow information comprises guaranteed flow bandwidth GFBR of the first QoS flow and/or the second QoS flow.

In another embodiment of a network element with a session management function provided in an embodiment of the present application, the offloading mode is a priority-based offloading mode, and the QoS flow information further includes maximum flow bandwidth resources MFBR of the first QoS flow and the second QoS flow;

the determining unit 903 is specifically configured to determine priorities of the first QoS flow and the second QoS flow according to the priority-based offloading mode;

the allocating unit 904 is configured to allocate a first bandwidth resource to a QoS flow of a first priority, and allocate a second bandwidth resource to a QoS flow of a second priority, where the first priority is greater than the second priority, and a sum of a guaranteed bandwidth value of the first bandwidth resource and a guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR and is not greater than the MFBR.

In another embodiment of the network element with a session management function provided in the embodiment of the present application, the obtaining unit 901 is further configured to obtain a current available bandwidth value corresponding to the QoS flow of the first priority;

The allocating unit 904 is specifically configured to allocate the first bandwidth resource according to the current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the current available bandwidth value.

In another embodiment of the network element with a session management function provided in the embodiment of the present application, when the offloading mode is a master-slave offloading mode, the determining unit 903 is specifically configured to determine a master QoS flow and a slave QoS flow in the first QoS flow and the second QoS flow according to the offloading mode;

the allocating unit 904 is specifically configured to allocate a first bandwidth resource to the primary QoS flow, where a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR.

In another embodiment of the network element with a session management function provided in the embodiment of the present application, the allocating unit 904 is further configured to, when a first bandwidth resource corresponding to the primary QoS flow is occupied, allocate, by the session management network element, a second bandwidth resource to the secondary QoS flow, where a guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR.

In another embodiment of the present application, which provides a session management function network element, the first indication information further includes a multiple access indication; the multiple access indication is used to instruct the session management network element to allocate bandwidth resources in both the first access technology and the second access technology;

The allocating unit 904 is further configured to allocate a second bandwidth resource to the slave QoS flow according to the multiple access indication, where a guaranteed bandwidth value of the first bandwidth resource is the same as a guaranteed bandwidth value of the second bandwidth resource.

In another embodiment of a network element with a session management function provided in the embodiment of the present application, the offloading mode is a minimum round trip time offloading mode, and the allocating unit 904 is specifically configured to allocate a first bandwidth resource to the first QoS flow and allocate a second bandwidth resource to the second QoS flow;

In another embodiment of a network element with a session management function provided in an embodiment of the present application, the offloading mode is a load balancing offloading mode, and the QoS flow information further includes maximum flow bandwidth resources MFBR of the first QoS flow and the second QoS flow; the determining unit 903 is specifically configured to determine a shunting ratio according to the load balancing shunting mode, and determine a first reference value and a second reference value according to the guaranteed stream bandwidth GFBR and the shunting ratio;

The allocating unit 904 is specifically configured to allocate a first bandwidth resource to the first QoS flow, where a guaranteed bandwidth value of the first bandwidth resource is greater than the first reference value, and allocate a second bandwidth resource to the second QoS flow, where the guaranteed bandwidth value of the second bandwidth resource is greater than the second reference value;

wherein a sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not greater than the maximum stream bandwidth MFBR.

In another embodiment of the network element with a session management function provided in this embodiment of the present application, the obtaining unit 901 is further configured to obtain a first current available bandwidth value corresponding to the first QoS flow and a second current available bandwidth value corresponding to the second QoS flow;

the allocating unit 904 is further configured to allocate the first bandwidth resource according to the first current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the first current available bandwidth value.

The allocating unit 904 is further configured to allocate the second bandwidth resource according to the second current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the second current available bandwidth value.

In another embodiment of the network element with session management function provided in the embodiment of the present application, the obtaining unit 801 is further configured to obtain second indication information of a second service flow, where the second indication information includes a splitting mode of the second service flow;

the processing unit 902 is further configured to, if the splitting mode of the first service flow is the same as the splitting mode of the second service flow, bind the first service flow and the second service flow to the established QoS flow.

In another embodiment of the present application, providing a network element with a session management function, where the first indication information includes a multiple access indication, where the multiple access indication is used to indicate that the session management network element allocates bandwidth resources in both the first access technology and the second access technology, the obtaining unit 901 is further configured to obtain second indication information of a second service flow, where the second indication information includes a split mode of the second service flow;

the processing unit 902 is further configured to, when the second indication information does not include a multiple access indication, bind the first traffic flow and the second traffic flow to different QoS flows.

In another embodiment of the present application, which provides a network element with a session management function, the first QoS flow and the first QoS flow are the same QoS flow.

It should be noted that, for details of the information execution process of the element of the session management network element, reference may be specifically made to the descriptions in the method embodiments shown in fig. 5 and fig. 6 in the present application, and details are not described here again.

Referring to fig. 10, an embodiment of a user plane network element according to the embodiment of the present application is shown. As shown in fig. 10, an embodiment of the present application provides an embodiment of a user plane network element, which includes

A receiving unit 1001, configured to receive service flow information sent by a session management network element, where the service flow information includes a split mode of the service flow and QoS flow bandwidth resource information of a quality of service flow to which the service flow belongs, and the service flow is a GBR service flow;

a sending unit 1002, configured to transmit the service flow according to the traffic splitting mode of the service flow and bandwidth resource information of the QoS flow to which the service flow belongs.

In another embodiment of the present invention, which provides a user plane network element, bandwidth resource information of QoS flow includes information of a first QoS flow and information of a second QoS flow, where the first QoS flow is a QoS flow established through a first access technology, and the second QoS flow is a QoS flow established through a second access technology; the user plane network element further comprises a determining unit 1003;

The determining unit 1003 is specifically configured to determine, according to the splitting mode, a transmission channel for transmitting the service stream;

the sending unit 1002 is specifically configured to transmit the service flow on the determined transmission channel.

In another embodiment of the user plane network element provided in the embodiment of the present application, the transmission channel of the service flow includes a first transmission channel and a second transmission channel, where the first transmission channel is used to transmit the service flow belonging to the first QoS flow, and the second transmission channel is used to transmit the service flow belonging to the second QoS flow; the bandwidth resource information includes bandwidth resources of the first transmission channel and bandwidth resources of the second transmission channel.

In another embodiment of the user plane network element provided in the embodiment of the present application, when the offloading mode is a priority-based offloading mode, the determining unit 1003 is specifically configured to determine priorities of the first QoS flow and the first QoS flow according to the priority-based offloading mode, and determine a transmission channel corresponding to the first priority as a transmission channel for transmitting the service flow, where the priority includes a first priority and a second priority, and the first priority is greater than the second priority;

The determining unit 1003 is specifically configured to determine a first bandwidth resource of a transmission channel corresponding to the first priority;

the sending unit 1002 is specifically configured to transmit the service flow on the transmission channel corresponding to the first priority by using the first bandwidth resource.

In another embodiment of the user plane network element provided in the embodiment of the present application, the determining unit 1003 is further configured to determine, when the first bandwidth resource is occupied, a second bandwidth resource of a transmission channel corresponding to the second priority;

the sending unit 1002 is specifically configured to transmit the service stream on the transmission channel corresponding to the second priority by using the second bandwidth resource.

In another embodiment of the user plane network element provided in the embodiment of the present application, when the offloading mode is a master-slave offloading mode, the determining unit 1003 is specifically configured to determine a master QoS flow and a slave QoS flow in the first QoS flow and the second QoS flow according to the master-slave offloading mode;

the determining unit 1003 is specifically configured to determine a transmission channel corresponding to the main QoS flow as a transmission channel for transmitting the service flow;

the determining unit 1003 is specifically configured to determine a first bandwidth resource of a transmission channel corresponding to the primary QoS flow;

The sending unit 1002 is specifically configured to transmit the service flow on a transmission channel corresponding to the primary QoS flow by using the first bandwidth resource.

In another embodiment of the user plane network element provided in the embodiment of the present application, the determining unit 1003 is further configured to determine, when the first bandwidth resource is occupied, a second bandwidth resource of the transmission channel corresponding to the slave QoS flow;

the sending unit 1002 is further configured to transmit the service flow on the transmission channel corresponding to the slave QoS flow by using the second bandwidth resource.

Referring to fig. 11, an embodiment of a session management network element in the embodiment of the present application may include one or more central processors 1101, a memory 1102, and a communication interface 1103.

Memory 1102 may be transient storage or persistent storage. Still further, the central processor 1101 may be configured to communicate with the memory 1102 to execute a series of instruction operations in the memory 1102 on the session management function network element.

In this embodiment, the central processing unit 1101 may perform the signal processing operation performed by the session management network element in the embodiments shown in fig. 5 and fig. 6, which is not described herein again specifically.

In this embodiment, the specific functional module division in the central processing unit 1101 may be similar to the functional module division manner of the units such as the obtaining unit, the processing unit, and the determining unit described in fig. 8 and fig. 9, and is not described herein again.

It should be noted that, for details of the information execution process of the central processor 1101 of the session management network element, reference may be specifically made to the descriptions in the method embodiments shown in fig. 5 and fig. 6 in the present application, and details are not described here again.

Referring to fig. 12, an embodiment of a user plane functional network element in the embodiment of the present application may include one or more central processing units 1201, a memory 1202, and a communication interface 1203.

Memory 1202 may be transient storage or persistent storage. Still further, the central processor 1201 may be configured to communicate with the memory 1202 to perform a series of instruction operations in the memory 1202 on the user plane functional network element.

In this embodiment, the central processing unit 1201 may perform the operations performed by the user plane network element in the embodiment shown in fig. 10, which is not described herein again specifically.

In this embodiment, the specific functional module division in the central processing unit 1201 may be similar to the functional module division of the determining unit, the sending unit, and the like described in fig. 10, and is not described herein again.

It should be noted that, for details of the information execution process of the central processing unit 1201 of the session management network element, etc., reference may be specifically made to the description in the foregoing method embodiment shown in fig. 7 of the present application, and details are not described here again.

An embodiment of the present application further provides a data transmission system, including: a session management network element device and a policy function device, where the session management network element device is the session management network element described in any possible implementation manner of the embodiment shown in fig. 9.

An embodiment of the present application further provides a data transmission system, including: the user plane network element device is the user plane network element device described in any possible implementation manner of the embodiment shown in fig. 10.

The embodiment of the present application further provides a chip or a chip system, where the chip or the chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform the method for data transmission described in any one of any possible implementation manners of the embodiments shown in fig. 5 and 6;

The embodiment of the present application further provides a chip or a chip system, where the chip or the chip system includes at least one processor and a communication interface, the communication interface and the at least one processor are interconnected by a line, and the at least one processor is configured to execute a computer program or instructions to perform the method for data transmission described in any one of any possible implementation manners of the embodiment shown in fig. 7;

An embodiment of the present application further provides a computer storage medium, where the computer storage medium is used to store computer software instructions for the session management network element and the user plane network element, and includes a program for executing a user plane function network element designed for the session management network element.

The session management network element may be a session management network element as described in the foregoing fig. 9.

The user plane network element may be the user plane network element described in the foregoing fig. 10.

An embodiment of the present application further provides a computer program product, where the computer program product includes computer software instructions, and the computer software instructions may be loaded by a processor to implement the flow in the method for processing a service flow in any one of fig. 5 to 7.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions described in accordance with the present application are generated, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can store or a data storage device, such as a server, a data center, etc., that is integrated with one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

Claims

1. A method of data transmission, the method comprising:

a session management network element acquires first indication information of a first service flow, wherein the first indication information comprises a shunting mode of the first service flow, and the first service flow is a guaranteed bit rate GBR service flow;

and the session management network element establishes a first QoS flow and/or a second QoS flow for transmitting the first service flow according to the first indication information, wherein the first QoS flow is the QoS flow established by a first access technology, and the second QoS flow is the QoS flow established by a second access technology.

2. The method of claim 1, further comprising:

the session management network element determines the bandwidth resource of the first QoS flow according to the traffic flow distribution mode and the QoS flow information, and/or

And the session management network element determines the bandwidth resource of the second QoS flow according to the traffic flow distribution mode and the QoS flow information, wherein the QoS flow information comprises a guaranteed flow bit rate GFBR of the first QoS flow and/or the second QoS flow and/or a guaranteed bit rate GBR of the traffic flow in the QoS flow.

3. The method of claim 2, wherein the offload mode is a priority-based offload mode, and wherein the QoS flow information further comprises Maximum Flow Bit Rates (MFBRs) for the first and second QoS flows;

the determining, by the session management network element, the bandwidth resource of the first QoS flow according to the traffic flow splitting pattern and the QoS flow information, and/or determining, by the session management network element, the bandwidth resource of the second QoS flow according to the traffic flow splitting pattern and the QoS flow information, includes:

the session management network element determines to preferentially allocate a first bandwidth resource on a first QoS flow according to the priority-based offload mode, wherein a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR;

or, when the guaranteed bandwidth value of the first bandwidth resource is smaller than a guaranteed flow bit rate GFBR, the session management network element allocates a second bandwidth resource to the second QoS flow, and a sum of the guaranteed bandwidth value of the first bandwidth resource and the guaranteed bandwidth value of the second bandwidth resource is not smaller than the GFBR or not larger than the MFBR.

4. The method of claim 3, wherein the session management network element allocating a first bandwidth resource for a first QoS flow comprises:

The session management network element acquires a current available bandwidth value of an access technology corresponding to the first QoS flow;

and the session management network element allocates the first bandwidth resource according to the current available bandwidth value, wherein a guaranteed bandwidth value of the first bandwidth resource is the same as the current available bandwidth value.

5. The method of claim 2, wherein the offloading mode is a master-slave offloading mode, and the determining, by the session management network element, the bandwidth resource of the first QoS flow according to the offloading mode of the traffic flow and QoS flow information and/or the determining, by the session management network element, the bandwidth resource of the second QoS flow according to the offloading mode of the traffic flow and QoS flow information comprises:

and the session management network element allocates a first bandwidth resource to the first QoS flow according to the shunting mode, wherein a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR.

6. The method of claim 5, further comprising:

and when the first bandwidth resource corresponding to the first QoS flow is unavailable, the session management network element allocates a second bandwidth resource to the second QoS flow, wherein the guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR.

7. The method of claim 5, wherein the first indication information further comprises a multiple access indication; the multiple access indication is used to instruct the session management network element to allocate bandwidth resources in both the first access technology and the second access technology, the method further comprising:

and the session management network element allocates a second bandwidth resource for the second QoS flow according to the multiple access indication, wherein the guaranteed bandwidth value of the first bandwidth resource is the same as the guaranteed bandwidth value of the second bandwidth resource.

8. The method as claimed in claim 2, wherein the offloading mode is a minimum round-trip time offloading mode, and the determining, by the session management element, the bandwidth resource of the first QoS flow according to the offloading mode of the traffic flow and QoS flow information and/or the determining, by the session management element, the bandwidth resource of the second QoS flow according to the offloading mode of the traffic flow and QoS flow information comprises:

the session management network element allocates a first bandwidth resource for the first QoS flow and allocates a second bandwidth resource for the second QoS flow;

9. The method of claim 2, wherein the offload mode is a load balancing offload mode, and wherein the QoS flow information further comprises maximum flow bandwidth resources MFBRs of the first and second QoS flows; the determining, by the session management network element, the bandwidth resource of the first QoS flow according to the traffic flow splitting pattern and the QoS flow information, and/or determining, by the session management network element, the bandwidth resource of the second QoS flow according to the traffic flow splitting pattern and the QoS flow information, includes:

the session management network element determines a shunting proportion according to the load balancing shunting mode;

the session management network element determines a first reference value and a second reference value according to the guaranteed stream bandwidth GFBR and the distribution ratio;

the session management network element allocates a first bandwidth resource for the first QoS flow, wherein a guaranteed bandwidth value of the first bandwidth resource is not less than the first reference value;

the session management network element allocates a second bandwidth resource for the second QoS flow, wherein a guaranteed bandwidth value of the second bandwidth resource is not less than the second reference value;

10. The method of claim 9, further comprising:

the session management network element obtains a first current available bandwidth value of a first access technology corresponding to the first QoS flow and a second current available bandwidth value of a second access technology corresponding to the second QoS flow;

the session management network element allocates the first bandwidth resource according to the first current available bandwidth value, wherein a guaranteed bandwidth value of the first bandwidth resource is the same as the first current available bandwidth value;

and the session management network element allocates the second bandwidth resource according to the second current available bandwidth value, wherein the guaranteed bandwidth value of the first bandwidth resource is the same as the second current available bandwidth value.

11. The method according to any one of claims 1 to 10, further comprising:

the session management network element acquires second indication information of a second service flow, wherein the second indication information comprises a shunting mode of the second service flow;

and if the shunting mode of the first service flow is the same as that of the second service flow, the session management network element binds the first service flow and the second service flow to the established QoS flow.

12. The method according to any of claims 1 to 10, wherein the first indication information and/or the second indication information further comprises a multiple access indication for indicating that the session management network element allocates bandwidth resources on both the first access technology and the second access technology.

13. The method according to claim 11, wherein the first indication information and/or the second indication information further comprises a multiple access indication, the multiple access indication being used to indicate that the session management network element allocates bandwidth resources in both the first access technology and the second access technology.

14. The method of claim 12, further comprising:

when the first indication information or the second indication information does not include the multi-access indication, the session management network element binds the first service flow and the second service flow to different QoS flows.

15. The method of claim 13, further comprising:

16. Method according to any of claims 1 to 10 or 13 to 15, wherein the first and second QoS flow are the same QoS flow, the first and second QoS flow having the same QoS flow identity QFI.

17. The method of claim 12, wherein the first QoS flow and the second QoS flow are the same QoS flow, and wherein the first QoS flow and the second QoS flow have the same QoS flow identification QFI.

18. A session management network element, comprising:

and the processing unit is used for establishing a first quality of service (QoS) flow and/or a second QoS flow for transmitting the first service flow according to the first indication information, wherein the first QoS flow is the QoS flow established by a first access technology, and the second QoS flow is the QoS flow established by a second access technology.

19. The session management network element of claim 18, wherein the session management network element further comprises a determining unit and an allocating unit, and the determining unit is configured to determine the bandwidth resource of the first QoS flow according to the traffic splitting pattern and the QoS flow information of the traffic flow, and/or determine the bandwidth resource of the first QoS flow according to the traffic splitting pattern and the QoS flow information of the traffic flow

And determining bandwidth resources of the second QoS flow according to the traffic flow distribution mode and the QoS flow information, wherein the QoS flow information comprises guaranteed flow bit rates GFBR of the first QoS flow and/or the second QoS flow and/or guaranteed bit rates GBR of traffic flows in the QoS flow.

20. The session management network element of claim 19, wherein the offload mode is a priority-based offload mode, and wherein the QoS flow information further comprises maximum flow bit rates MFBRs for the first and second QoS flows;

the determining unit is configured to determine that a first bandwidth resource is preferentially allocated in a first QoS flow, where a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR;

21. The element of session management network of claim 20, wherein the obtaining unit is further configured to obtain a current available bandwidth value of an access technology corresponding to the first QoS flow;

The allocating unit is configured to allocate the first bandwidth resource according to the current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the current available bandwidth value.

22. The element of session management according to claim 19, wherein the offloading mode is a master-slave offloading mode, and the allocating unit is configured to allocate a first bandwidth resource to the first QoS flow according to the offloading mode, where a guaranteed bandwidth value of the first bandwidth resource is not less than the GFBR.

23. The session management network element of claim 22, wherein the allocating unit is further configured to allocate a second bandwidth resource for the second QoS flow when a first bandwidth resource corresponding to the first QoS flow is unavailable, wherein a guaranteed bandwidth value of the second bandwidth resource is not less than the GFBR.

24. The session management network element of claim 22, wherein the first indication information further comprises a multiple access indication; the multiple access indication is used to instruct the session management network element to allocate bandwidth resources in both the first access technology and the second access technology;

25. The session management network element of claim 19, wherein the split mode is a minimum round trip time split mode, and the allocating unit is configured to allocate a first bandwidth resource for the first QoS flow and allocate a second bandwidth resource for the second QoS flow;

26. The session management network element of claim 19, wherein the offload mode is a load balancing offload mode, and wherein the QoS flow information further comprises maximum flow bandwidth resources MFBRs of the first and second QoS flows; the determining unit is specifically configured to determine a shunting proportion according to the load balancing shunting mode, and determine a first reference value and a second reference value according to the guaranteed stream bandwidth GFBR and the shunting proportion;

27. The session management network element of claim 26, wherein the obtaining unit is further configured to obtain a first current available bandwidth value of a first access technology corresponding to the first QoS flow and a second current available bandwidth value of a second access technology corresponding to the second QoS flow;

the allocating unit is further configured to allocate the first bandwidth resource according to the first current available bandwidth value, where a guaranteed bandwidth value of the first bandwidth resource is the same as the first current available bandwidth value;

28. The session management network element according to any one of claims 18 to 27, wherein the obtaining unit is further configured to obtain second indication information of a second service flow, where the second indication information includes a split mode of the second service flow;

29. The session management network element according to any of claims 18 to 27, wherein the first indication information and/or the second indication information further comprises a multiple access indication indicating that bandwidth resources are allocated in both the first access technology and the second access technology.

30. The session management network element according to claim 28, wherein the first indication information and/or the second indication information further comprises a multiple access indication indicating that bandwidth resources are allocated in both the first access technology and the second access technology.

31. The session management network element of claim 29, wherein the processing unit is further configured to bind the first traffic flow and the second traffic flow into different QoS flows when the first indication information or the second indication information does not include the multiple access indication.

32. The session management network element of claim 30, wherein the processing unit is further configured to bind the first traffic flow and the second traffic flow into different QoS flows when the first indication information or the second indication information does not include the multiple access indication.

33. Session management network element according to any of claims 18 to 27 or 30 to 32, wherein the first QoS flow and the second QoS flow are the same QoS flow, the first QoS flow and the second QoS flow having the same QoS flow identity QFI.

34. Session management network element according to claim 29, wherein said first QoS flow and said second QoS flow are the same QoS flow, said first QoS flow and said second QoS flow having the same QoS flow identity QFI.

35. A session management network element, comprising: at least one processor, a memory, the memory storing computer-executable instructions executable on the processor, the processor performing a method according to any one of the possible implementations of the above claims 1 to 17 when the computer-executable instructions are executed by the processor.

36. A data transmission system, comprising: a session management network element device and a policy function device, wherein the session management network element device is the session management network element as claimed in any one of the preceding claims 18 to 34.

37. A computer-readable storage medium storing one or more computer-executable instructions, wherein when the computer-executable instructions are executed by a processor, the processor performs the method of any of claims 1 to 17.