TW201947985A - Method and device for binding data stream, computer storage medium - Google Patents

Abstract

Embodiments of the present invention disclose a method and apparatus for binding a data stream, and a computer storage medium thereof. The method comprises an action of receiving, by a first access network element, a data flow establishment request message in a PDU session or modification request message sent by a first core network element and an action of binding by the first access network element the data stream and/or the session to be established or to be modified and/or at least one tunnel to a corresponding radio bearer in corresponding RAT according to the data flow establishment request message or the modification request message, the at least one tunnel being used to transmit data between the core network and the access network.

Description

Method and device for binding data flow, computer storage medium

The present application relates to the field of wireless communication technologies, and in particular, to a method and device for binding data flow, and a computer storage medium.

Referring to FIG. 1, FIG. 1 is an existing networking mode in which a path on a user plane is represented by a solid line and a path on a control plane is represented by a dashed line. In this networking mode, a terminal (UE, User Equipment) may be New Air Interface (NR) access and Long Term Evolution (LTE) access are established simultaneously on the same Protocol Data Unit (PDU) Session (Session). Part of the data flow of the PDU Session goes The air interface bearer between the NR base station (RAN node-1) and the UE, the other part of the data flow is carried by the air interface bearer between the LTE base station (RAN node-2) and the UE.

Among them, the NR base station or LTE base station serves as the anchor point of the control plane, and the receiving core access and mobility management function (AMF, Core Access and Mobility Management Function) and session management function (SMF, Session Management Function) of the core network side. Perform signal interactions and complete operations such as establishing / modifying / deleting PDU sessions.

At present, the anchor point on the RAN side only judges which data flow is carried by the NR corresponding air interface and which data flow is carried by the LTE corresponding air interface based on its own air interface channel quality and quality of service (QoS) satisfaction. Carrying, poor controllability.

The embodiments of the present application provide a method and device for binding data flow, and a computer storage medium.

The method for binding data flow provided in the embodiments of the present application includes:

The first access network element receives a data flow establishment request message or a modification request message in a PDU session sent by the first core network element;

The first access network element binds each to-be-established or to-be-modified data flow and / or session and / or at least one tunnel to a radio bearer of a corresponding RAT according to the establishment request message or modification request message. The at least one tunnel is used for transmitting data between the core network and the access network.

In one embodiment, the establishment request message or modification request message includes a first instruction message, and the first instruction message includes at least one of the following:

The correspondence between the data flow instruction message and the RAT instruction message corresponding to the data flow to be created or modified;

Correspondence between tunnel information and RAT indication message corresponding to at least one tunnel.

In an embodiment, the first indication message further includes an indication message of whether the data flow to be established or modified is offloaded and / or an indication message of whether the uplink and downlink transmissions correspond to the same RAT;

The indication message of whether to offload is used to indicate whether the data flow is transmitted under multiple RATs.

In one embodiment, one data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages.

In one embodiment, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

In an embodiment, the establishment request message or modification request message includes a second instruction message, and the second instruction message includes a data process instruction message corresponding to a data process to be created or modified;

A first configuration message is stored on the network element side of the first access network, and the first configuration message includes RAT indication messages corresponding to different data flow indication message ranges.

In an embodiment, the first access network element binds each data flow and / or session to be established or modified to a radio bearer of a corresponding RAT according to the establishment request message or the modification request message. , Including:

The first access network element determines, according to the second instruction message and the first configuration message, a RAT corresponding to each data flow to be created or to be modified, and assigns each data to be created or to be modified Processes and / or sessions are bound to radio bearers under the corresponding RAT.

In one embodiment, the first configuration message is statically configured on the network element side of the first access network, or the first configuration message is sent to the first access network by the core network side or the network management side. Network element.

In an embodiment, the second indication message is generated by the first core network element based on a binding policy, and the binding policy includes at least one of the following: each attribute information of a data flow, a PDU session, and a RAT. Correspondence, an indication message of whether the multi-connection function is supported, and an indication message of whether to trigger the multi-connection function, wherein the attribute information includes at least one of the following: a packet characteristic message, and an application id.

In one embodiment, the binding policy is stored in a subscription message. When the terminal performs registration or a PDU session is established, the first core network element receives the subscription message and obtains the subscription message from the subscription message. Binding strategy.

In an implementation manner, a RAT corresponding to DNN and / or S-NSSAI is configured in the subscription message, so that the first core network element determines, based on the subscription message, to establish or The RAT corresponding to the modified PDU session, the establishment request message or modification request message sent by the first core network element to the first access network element carries a third instruction message, and the third instruction message is used for Indicates the RAT corresponding to the PDU session.

In an embodiment, the data flow to be established or modified and / or the binding operation of at least one tunnel to a radio bearer under the corresponding RAT is triggered in the following manner: the second core network element sends the A core network element sends a first request message.

In one embodiment, the first request message is sent by the third-party server to the second core network element, and the second core network element is forwarded to the first core network element.

In an embodiment, the method further includes:

The terminal sends a second request message to the first core network element or the second core network element; and / or, a third-party server sends a second request message to the first core network element or the second core network. For the network element, the second request message includes a binding policy, and the binding policy includes at least one of the following: information on each attribute of the data flow, the correspondence between the PDU session and the RAT, an indication message of whether the multi-connection function is supported, An indication message of whether to trigger multi-connection, wherein the attribute information includes at least one of the following: a packet characteristic message and an Application ID.

In one embodiment, the binding policy is sent by the network side to the terminal.

In an embodiment, the method further includes:

The first access network element binds each to-be-established or to-be-modified data flow and / or session and / or at least one tunnel to a radio bearer of a corresponding RAT, and then sends the data flow to the first core network. Yuan sends a confirmation message.

In an embodiment, the method further includes:

Receiving, by the first access network element, a fourth instruction message sent by the first core network element, and determining whether to enable the multi-connection function based on the fourth instruction message; or

When the first access network element receives at least two tunnel messages sent by the first core network element, the first access network element determines to enable the multi-connection function.

In one embodiment, the fourth instruction message is further used to indicate the type of each access network network element in the multi-connection.

In one embodiment, when there are N tunnel messages and the fourth indication message sent to the first access network element, a tunnel is set up for each access network element for data transmission, N≥ 2.

In one embodiment, the multi-connection function includes at least a dual-connection function.

In one embodiment, the dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

The method for binding data flow provided in the embodiments of the present application includes:

The terminal sends a second request message to the first core network element or the second core network element. The second request message includes a binding policy, and the binding policy includes at least one of the following: each attribute information of the data flow. , The correspondence between the PDU session and the RAT, an indication message of whether the multi-connection function is supported, or an indication message of whether the multi-connection function is triggered, wherein the attribute information includes at least one of the following: a packet characteristic message, and an application id.

In one embodiment, the multi-connection function includes at least a dual-connection function.

In one embodiment, the multi-connection function includes at least a dual-connection function.

In one embodiment, the dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

In one embodiment, the second request message includes a session establishment request message or a session modification request message.

In an implementation manner, the second request message sent by the terminal includes a binding relationship, and the binding relationship is used to indicate that the established and / or modified data flow and / or session is bound to a storage Get network NEs.

In an embodiment, the second request message sent by the terminal includes a correspondence relationship, and the correspondence relationship is used to indicate that a data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages.

In one embodiment, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

The method for binding data flow provided in the embodiments of the present application includes:

The terminal sends a second request message to the first core network element or the second core network element, and when the terminal sends the second request message multiple times, data created and / or modified by different second request messages Processes and / or sessions need to be bound to different access network elements for transmission.

The apparatus for binding data flow provided in the embodiment of the present application includes:

A receiving unit, configured to receive a setup request message or a modification request message for a data flow in a PDU session sent by a first core network element;

A binding unit is configured to bind each data flow and / or session to be established or modified and / or at least one tunnel to a radio bearer of a corresponding RAT according to the establishment request message or the modification request message. The at least one tunnel is used to transmit data between the core network and the access network.

In one embodiment, the establishment request message or modification request message includes a first instruction message, and the first instruction message includes at least one of the following:

The correspondence between the data flow instruction message and the RAT instruction message corresponding to the data flow to be created or modified;

Correspondence between tunnel information and RAT indication message corresponding to at least one tunnel.

In an embodiment, the first indication message further includes an indication message of whether the data flow to be established or modified is offloaded and / or an indication message of whether the uplink and downlink transmissions correspond to the same RAT;

The indication message of whether to offload is used to indicate whether the data flow is transmitted under multiple RATs.

In one embodiment, one data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages.

In one embodiment, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

In an embodiment, the establishment request message or modification request message includes a second instruction message, and the second instruction message includes a data process instruction message corresponding to a data process to be created or modified;

The device further includes a storage unit for storing a first configuration message, where the first configuration message includes a RAT indication message corresponding to a different data flow indication message range.

In an embodiment, the binding unit is configured to determine, according to the second instruction message and the first configuration message, a RAT corresponding to each data flow to be established or to be modified, and Or the data flow and / or session to be modified are bound to the radio bearer under the corresponding RAT.

In one embodiment, the first configuration message is statically configured on the network element side of the first access network, or the first configuration message is sent to the first access network by the core network side or the network management side. Network element.

In an embodiment, the second indication message is generated by the first core network element based on a binding policy, and the binding policy includes at least one of the following: each attribute information of a data flow, a PDU session, and a RAT. Correspondence, an indication message of whether the multi-connection function is supported, and an indication message of whether to trigger the multi-connection function, wherein the attribute information includes at least one of the following: a packet characteristic message, and an application id.

In one embodiment, the binding policy is stored in a subscription message. When the terminal performs registration or a PDU session is established, the first core network element receives the subscription message and obtains the subscription message from the subscription message. Binding strategy.

In an implementation manner, a RAT corresponding to DNN and / or S-NSSAI is configured in the subscription message, so that the first core network element determines, based on the subscription message, to establish or The RAT corresponding to the modified PDU session, the establishment request message or modification request message sent by the first core network element to the first access network element carries a third instruction message, and the third instruction message is used for Indicates the RAT corresponding to the PDU session.

In an embodiment, the data flow to be established or modified and / or the binding operation of at least one tunnel to a radio bearer under the corresponding RAT is triggered in the following manner: the second core network element sends the A core network element sends a first request message.

In one embodiment, the first request message is sent by the third-party server to the second core network element, and the second core network element is forwarded to the first core network element.

In an embodiment, the terminal sends a second request message to the first core network element or the second core network element; and / or, a third-party server sends a second request message to the first core network element. Element or a second core network element, the second request message includes a binding policy, and the binding policy includes at least one of the following: the attribute information of the data flow, the correspondence between the PDU session and the RAT, An indication message of a connection function and an indication message of whether to trigger multi-connection. The attribute message includes at least one of the following: a packet characteristic message and an Application ID.

In one embodiment, the binding policy is sent by the network side to the terminal.

In an embodiment, the device further includes:

A sending unit, configured to send a confirmation message to the first core network element.

In an embodiment, the receiving unit is further configured to receive a fourth instruction message sent by the first core network element, and determine whether to enable the multi-connection function based on the fourth instruction message; or, receive the first In the case of at least two tunnel messages sent by a core network element, it is determined to enable the multi-connection function.

In one embodiment, the fourth instruction message is further used to indicate the type of each access network network element in the multi-connection.

In one embodiment, when there are N tunnel messages and the fourth indication message sent to the first access network element, a tunnel is set up for each access network element for data transmission, N≥ 2.

In one embodiment, the multi-connection function includes at least a dual-connection function.

In one embodiment, the dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

The apparatus for binding data flow provided in the embodiment of the present application includes:

The sending unit is configured to send a second request message to the first core network element or the second core network element. The second request message includes a binding policy, and the binding policy includes at least one of the following: a data flow. Each attribute message, the corresponding relationship between the PDU session and the RAT, the indication message of whether the multi-connection function is supported, the indication message of whether the multi-connection is triggered, etc., wherein the attribute message includes at least one of the following: a packet characteristic message, and an application id.

In one embodiment, the multi-connection function includes at least a dual-connection function.

In one embodiment, the dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

In one embodiment, the second request message includes a session establishment request message or a session modification request message.

In an implementation manner, the second request message sent by the terminal includes a binding relationship, and the binding relationship is used to indicate that the established and / or modified data flow and / or session is bound to a storage Get network NEs.

In an embodiment, the second request message sent by the terminal includes a correspondence relationship, and the correspondence relationship is used to indicate that a data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages.

In one embodiment, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

The apparatus for binding data flow provided in the embodiment of the present application includes:

A sending unit, configured to send a second request message to a first core network element or a second core network element, wherein when the second request message is sent multiple times, different second request messages are established and / or The modified data flow and / or session need to be bound to different access network elements for transmission.

The computer storage medium provided in the embodiment of the present application stores computer-executable instructions. The computer-executable instructions are implemented by the processor to implement the foregoing method for binding data.

In the technical solution of the embodiment of the present application, the first access network element receives the data flow establishment request message or the modification request message in the PDU session sent by the first core network element; the first access network element is based on The establishment request message or the modification request message binds each data flow and / or session to be established or modified to a radio bearer of a corresponding RAT. With the technical solution of the embodiment of the present application, the selection of the RAT by the data flow is controlled, and the anchor on the RAN side can determine how each data flow (ie, QoS flow) in the PDU session is mapped to the air according to the instruction message sent by other network elements. Interface Bearer (DRB).

In order to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail with reference to the accompanying drawings. The attached drawings are for reference only and are not intended to limit the embodiments of the present application.

FIG. 2 is a first schematic flowchart of a method for binding data flow according to an embodiment of the present application. As shown in FIG. 2, the method for binding data flow includes the following steps:

Step 201: The first access network element receives a data flow establishment request message or a modification request message in a PDU session sent by the first core network element.

In the embodiment of the present application, the first access network element is an anchor point on the RAN side, such as the NR base station or the LTE base station in FIG. 1. The first core network element is SMF. The second core network element referred to below is a PCF.

The RAN side chooses to establish a radio bearer under a specific RAT according to the establishment / modification request message of the data flow in the PDU session sent by the core network side.

Step 202: The first access network element binds each data flow and / or session to be established or modified and / or at least one tunnel to the corresponding RAT according to the establishment request message or the modification request message. In the wireless bearer, the at least one tunnel is used to transmit data between the core network and the access network.

In the embodiment of the present application, the first access network element binds each to-be-created or to-be-modified data flow and / or session to a radio bearer of a corresponding RAT according to the establishment request message or modification request message. , Can be divided into the following situations:

Case 1: Referring to FIG. 3, the establishment request message or modification request message includes a first instruction message, and the first instruction message includes at least one of the following:

The correspondence between the data flow instruction message and the RAT instruction message corresponding to the data flow to be created or modified;

Correspondence between tunnel information and RAT indication message corresponding to at least one tunnel.

Further, the first indication message further includes an indication message of whether the data flow to be established or modified is offloaded and / or an indication message of whether the uplink and downlink transmissions correspond to the same RAT. The indication message of whether to offload is used to indicate whether the data flow is transmitted under multiple RATs.

For example, the indication of the data flow shunting indication message: the data flow running in the core network corresponds to a part of the NR base station on the RAN side and a part of the LTE base station.

Here, one data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages. When one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

Specifically, the SMF sends a first instruction message to the RAN side, where the first instruction message includes a list of data flows to be created / modified and a corresponding RAT. The RAN side binds the data flow or the entire PDU session to radio bearers under different RATs according to the first instruction message sent by the SMF.

RAT can be the following access types: NR access, LTE access, WLAN access, 3GPP access, non-3GPP access, satellite access, and so on.

The following uses Table 1 to exemplify the first instruction message. The QFI value indicates the data flow instruction message, and the RAT selection indicates the RAT instruction message.

QFI value RAT chooses whether to split the bearer, whether the uplink and downlink are the same RAT

Table 1

In addition, the first indication message also includes an indication message whether the data flow to be established or modified is offloaded and / or an indication message whether the uplink and downlink transmissions correspond to the same RAT. As shown in Table 1, whether a split bearer is performed indicates whether the offload The indication message, whether the uplink and downlink are the same RAT, indicates whether the uplink and downlink transmission corresponds to the same RAT.

It should be understood that whether the split bearer is performed means that all downlink data processes are sent to the anchor point on the RAN side, and then the anchor point on the RAN side is forwarded to the designated RAT respectively. For example, the anchor point on the RAN side is the NR base station. The data flow needs to be carried on the bearer of the LTE air interface. When the split bearer is performed, the data flow of the core network is sent to the NR base station. The data flow transmitted on the network is forwarded to the LTE base station. On the contrary, if the split bearer is not performed, the core network will directly send the data flow to the LTE base station without forwarding by the NR base station.

In addition, the RAT selection can be a priority list. As shown in the RAT selection corresponding to QFI = 1 in Table 1, the first preferred access to LTE and the second access to NR indicate priority access to LTE, and LTE access failure. Or access to NR only when other conditions occur.

Case 2: Referring to FIG. 4, the establishment request message or modification request message includes a second instruction message, and the second instruction message includes a data flow instruction message corresponding to a data flow to be created or modified; the first access The network element side of the network stores a first configuration message, where the first configuration message includes RAT indication messages corresponding to different data flow indication message ranges.

In this case, the first access network element determines, according to the second instruction message and the first configuration message, a RAT corresponding to each data flow to be created or modified, and The data flow and / or session to be modified are bound to the radio bearer under the corresponding RAT.

In one embodiment, the first configuration message is statically configured on the network element side of the first access network, or the first configuration message is sent to the first access network by the core network side or the network management side. Network element.

In an embodiment, the second indication message is generated by the first core network element based on a binding policy, and the binding policy includes at least one of the following: each attribute information of a data flow, a PDU session, and a RAT. Correspondence, an indication message of whether the multi-connection function is supported, and an indication message of whether to trigger the multi-connection function, wherein the attribute information includes at least one of the following: a packet characteristic message, and an application id. Further, the binding policy is stored in a subscription message, and when the terminal performs registration or a PDU session establishment, the first core network element receives the subscription message and obtains the binding policy from the subscription message. Here, the indication message of whether the dual-connection triggering function is supported refers to: whether the terminal has dual-connection capability.

Specifically, after receiving the data flow establishment / modification request sent by the SMF, the RAN side establishes radio bearers of different data flows under different RATs according to the QFI value and the RAT corresponding to the QFI value range. Here, the corresponding relationship between the QFI value range and the RAT is statically configured on the RAN side or previously sent by the core network / network management to the RAN, that is, the mapping relationship similar to Table 1 is pre-configured on the RAN side, and there is no need to establish the data flow of each PDU session. / Make changes when modifying.

Further, the value of QFI is generated by SMF, and can be generated according to the binding strategy shown in Table 2. Specifically, the SMF / PCF network element triggers the establishment of radio bearers of different data flows under different RATs when the triggering conditions are met according to the binding policy shown in Table 2.

Table 2

The packet characteristic information includes one or more of the following: URL, SNI (Server Name Indicator), IP source address, IP source port number, IP destination address, IP destination port number, MAC source address, IP source port number , MAC destination address, MAC destination port number, protocol type, and VLAN tag. All the messages on the left in Table 2 (referred to as the attribute information of the data flow in the embodiment of this application) will eventually correspond to a data flow, and each data flow has its own QFI (QoS Flow Id).

Case 3: The DRAT and / or S-NSSAI corresponding RAT is configured in the contract message, so that the first core network element determines the PDU established or modified based on the DNN and / or S-NSSAI according to the contract message. The RAT corresponding to the session, the establishment request message or modification request message sent by the first core network element to the first access network element carries a third instruction message, and the third instruction message is used to indicate the The RAT corresponding to the PDU session.

Specifically, the RAT type corresponding to the DNN and / or S-NSSAI is configured in the contract message, and the PDU session established / modified on the subsequent SMF according to the DNN and / or S-NSSAI can only select the specified RAT type, including NR, LTE , NR, LTE, and so on, when the SMF establishes / modifies a PDU session request, it only carries the RAT type corresponding to the PDU session.

In an embodiment, the data flow to be established or modified and / or the binding operation of at least one tunnel to a radio bearer under the corresponding RAT is triggered in the following manner: the second core network element sends the A core network element sends a first request message. Further, the first request message is sent by a third-party server to the second core network element, and the second core network element is forwarded to the first core network element.

In addition, the first core network element or the second core network element may obtain a binding policy in the following manner: the terminal sends a second request message to the first core network element or the second core network element; and / Or, the third-party server sends a second request message to the first core network element or the second core network element, the second request message includes a binding policy, and the binding policy includes at least one of the following : The attribute information of the data flow, the correspondence between the PDU session and the RAT, the indication message of whether the multi-connection function is supported, the indication message of whether the multi-connection is triggered, etc., wherein the attribute message includes at least one of the following: a packet characteristic message, Application id. Here, the indication message of whether the dual-connection triggering function is supported refers to: whether the terminal has the dual-connection capability.

Here, the binding policy may be stored in a subscription message and sent to the core network element (such as SMF) when the UE performs registration or PDU session establishment. The binding policy is sent by the network side to the terminal.

Specifically, the UE sends a request data flow binding message to the PCF / SMF through the NAS message and / or the third-party OTT server sends a request data flow binding message to the PCF / SMF. The request data flow binding message includes the information in Table 2. The binding strategy shown below.

In the embodiment of the present application, the first access network element binds each to-be-established or to-be-modified data flow and / or session and / or at least one tunnel to a radio bearer of a corresponding RAT, and sends the The first core network element sends a confirmation message.

In the embodiment of the present application, in addition to binding each of the data processes and / or sessions to be established or modified to the radio bearer of the corresponding RAT, at least one tunnel may be bound to the radio of the corresponding RAT. In the bearer, further, the first access network element receives a fourth instruction message sent by the first core network element, and determines whether to enable the multi-connection function based on the fourth instruction message (the display manner determines whether to enable the multi-connection function. Dual connection function); or when the first access network element receives at least two tunnel messages sent by the first core network element, the first access network element determines to enable the multi-connection function (The implicit method determines whether the dual connection function is turned on).

In one embodiment, the fourth instruction message is further used to indicate the type of each access network network element in the multi-connection.

Taking dual connectivity as an example, the fourth instruction message indicates that the type of the first access network element is an NR base station, and the type of the second access network element is an LTE base station, or the fourth instruction message indicates The type of the second access network element is an NR base station, and the type of the first access network element is an LTE base station, or the fourth instruction message indicates the first access network element and the second access network. The types of the network elements are all NR base stations, or the fourth indication message indicates that the types of the first access network element and the second access network element are both LTE base stations.

In one embodiment, when there are N tunnel messages and the fourth indication message sent to the first access network element, a tunnel is set up for each access network element for data transmission, N≥ 2.

Here, the access network element side needs to establish an interface with the core network. If there are multiple tunnel messages, each access network element in the multi-connection needs to establish a tunnel for data transmission.

The multi-connection function involved in the above solution includes at least a dual-connection function.

Here, the dual connection function is a first dual connection function or a second dual connection function; wherein,

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

For example, during the PDU session establishment and / or modification process, the core network element (SMF) can provide one or more core network side tunnel information (CN Tunnel Info) to the access network element, that is, N3 Tunnel message The N3 Tunnel message points to the N3 Tunnel address. Further, each CN Tunnel Info corresponds to a RAT, that is, the data transmitted by the tunnel indicated by the CN Tunnel Info is transmitted through a specific RAT wireless access. Further, the core network indicates to the access network whether to trigger dual connectivity (DC, Dual Connectivity) function, including the following two forms of DC:

DC-1: Referring to FIG. 5 (a), one or more UPFs are respectively connected to RAN Node-1 and RAN Node-2.

DC-2: Referring to Figure 5 (b), one or more UPFs are only connected to RAN Node-1. The data through RAN Node-2 is provided by RAN Node-1 through the Xn interface.

FIG. 6 is a second flowchart of a method for binding data flow according to an embodiment of the present application. As shown in FIG. 6, the method for binding data flow includes the following steps:

Step 601: The UE sends a PDU session establishment / modification request message to the SMF / UPF. Optionally, the PDU session establishment / modification request message adds a packet characteristic description message / Application id and a corresponding RAT selection (similar to that shown in Table 2). Binding strategy).

Step 602: 2a. During the interaction between the SMF and the PCF, the PCF may configure the binding strategy shown in Table 2; and / or, 2b. The SMF interacts with the UDM to obtain the RAT selection strategy corresponding to the DNN / NSSAI through the contract message.

Step 603: The SMF triggers a PDU session establishment / modification request.

3a. If the PDU session establishment / modification request message in step 401 carries a RAT selection requirement (that is, a binding policy), the request is immediately initiated.

3b. If a subsequent application data stream is generated, the SMF triggers the request according to the binding policy or RAT selection policy configured in step 602.

Here, the SMF adds the indication message shown in Table 1 to the request message sent to the RAN side; or determines the value of QFI according to the static configuration rule and then sends it to the RAN side.

Step 604: The RAN establishes a radio bearer according to a RAT indication parameter or a QFI value.

Step 605: The RAN sends a reply message to the SMF / UPF.

FIG. 7 is a third flowchart of a method for binding data flow according to an embodiment of the present application. As shown in FIG. 7, the method for binding data flow includes the following steps:

Step 701: The terminal sends a second request message to the first core network element or the second core network element. The second request message includes a binding policy, and the binding policy includes at least one of the following: Each attribute message, the correspondence between the PDU session and the RAT, an indication message of whether the multi-connection function is supported, or an indication message of whether the multi-connection is triggered, wherein the attribute message includes at least one of the following: a packet characteristic message, and an application id.

In one embodiment, the multi-connection function includes at least a dual-connection function.

The dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

Here, the second request message includes a session establishment request message or a session modification request message.

In an implementation manner, the second request message sent by the terminal includes a binding relationship, and the binding relationship is used to indicate that the established and / or modified data flow and / or session is bound to a storage Get network NEs. For example, the data flow for the first session establishment of the terminal is transmitted through RAT-1, and when the terminal initiates the second second request message, the newly established data flow is transmitted through RAT-2.

In an embodiment, the second request message sent by the terminal includes a correspondence relationship, and the correspondence relationship is used to indicate that a data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages. Further, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

Then, the processes on the access network side and the core network side can be understood by referring to the description of the method of binding data flow shown in FIG. 5 and the description of the method of binding data flow shown in FIG.

The above method is the data flow and / or session to which the terminal indicates through the second request message to indicate which access network element should be bound to. Not limited to this, the terminal may also determine in an implicit way to which access network element the data flow and / or session to be established and / or modified should be bound. Specifically, the terminal sends a second request message to the first A core network element or a second core network element, wherein when the terminal sends the second request message multiple times, the data flow and / or session created and / or modified by different second request messages need to be bound Transfer to different access network elements. For example, the terminal sends the second request message for the first time, and the data flow and / or session established and / or modified this time are bound to RAT-1 for transmission; the terminal sends the second request message for the second time, and the establishment and / or Or the modified data flow and / or session is bound to RAT-2 for transmission.

FIG. 8 is a first schematic structural diagram of a device for binding data flow according to an embodiment of the present application. As shown in FIG. 8, the device includes:

A receiving unit 801, configured to receive a setup request message or a modification request message for a data flow in a PDU session sent by a first core network element;

A binding unit 802, configured to bind each data flow and / or session to be established or modified and / or at least one tunnel to a radio bearer of a corresponding RAT according to the establishment request message or the modification request message, The at least one tunnel is used for transmitting data between the core network and the access network.

In one embodiment, the establishment request message or modification request message includes a first instruction message, and the first instruction message includes at least one of the following:

The correspondence between the data flow instruction message and the RAT instruction message corresponding to the data flow to be created or modified;

Correspondence between tunnel information and RAT indication message corresponding to at least one tunnel.

In an embodiment, the first indication message further includes an indication message of whether the data flow to be established or modified is offloaded and / or an indication message of whether the uplink and downlink transmissions correspond to the same RAT;

The indication message of whether to offload is used to indicate whether the data flow is transmitted under multiple RATs.

In one embodiment, one data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages.

In one embodiment, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

In an embodiment, the establishment request message or modification request message includes a second instruction message, and the second instruction message includes a data process instruction message corresponding to a data process to be created or modified;

The device further includes: a storage unit 803, configured to store a first configuration message, where the first configuration message includes RAT indication messages corresponding to different data flow indication message ranges.

In an embodiment, the binding unit 802 is configured to determine, according to the second instruction message and the first configuration message, a RAT corresponding to each data flow to be established or to be modified, and The data flow and / or session to be established or to be modified are bound to the radio bearer under the corresponding RAT.

In one embodiment, the first configuration message is statically configured on the network element side of the first access network, or the first configuration message is sent to the first access network by the core network side or the network management side. Network element.

In an embodiment, the second indication message is generated by the first core network element based on a binding policy, and the binding policy includes at least one of the following: each attribute information of a data flow, a PDU session, and a RAT. Correspondence, an indication message of whether the multi-connection function is supported, and an indication message of whether to trigger the multi-connection function, wherein the attribute information includes at least one of the following: a packet characteristic message, and an application id.

In one embodiment, the binding policy is stored in a subscription message. When the terminal performs registration or a PDU session is established, the first core network element receives the subscription message and obtains the subscription message from the subscription message. Binding strategy.

In an implementation manner, a RAT corresponding to DNN and / or S-NSSAI is configured in the subscription message, so that the first core network element determines, based on the subscription message, to establish or The RAT corresponding to the modified PDU session, the establishment request message or modification request message sent by the first core network element to the first access network element carries a third instruction message, and the third instruction message is used for Indicates the RAT corresponding to the PDU session.

In an embodiment, the data flow to be established or modified and / or the binding operation of at least one tunnel to a radio bearer under the corresponding RAT is triggered in the following manner: the second core network element sends the A core network element sends a first request message.

In one embodiment, the first request message is sent by the third-party server to the second core network element, and the second core network element is forwarded to the first core network element.

In an embodiment, the terminal sends a second request message to the first core network element or the second core network element; and / or, a third-party server sends a second request message to the first core network element. Element or a second core network element, the second request message includes a binding policy, and the binding policy includes at least one of the following: the attribute information of the data flow, the correspondence between the PDU session and the RAT, An indication message of a connection function and an indication message of whether to trigger multi-connection. The attribute message includes at least one of the following: a packet characteristic message and an Application ID.

In one embodiment, the binding policy is sent by the network side to the terminal.

In an embodiment, the device further includes:

The sending unit 804 is configured to send a confirmation message to the first core network element.

In an embodiment, the receiving unit 801 is further configured to receive a fourth instruction message sent by the first core network element, and determine whether to enable the multi-connection function based on the fourth instruction message; or, receive the In the case of at least two tunnel messages sent by the first core network element, it is determined to enable the multi-connection function.

In an implementation manner, the fourth instruction message is further used to indicate the type of each access network network element in the multi-connection.

In one embodiment, when there are N tunnel messages and the fourth indication message sent to the first access network element, a tunnel is set up for each access network element for data transmission, N≥ 2.

In one embodiment, the multi-connection function includes at least a dual-connection function. Further, the dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

Those skilled in the art should understand that the implementation function of each unit in the apparatus for binding data flow shown in FIG. 8 can be understood by referring to the related description of the foregoing method for binding data flow. The functions of the units in the device for binding data flow shown in FIG. 8 can be realized through programs running on the processor, and can also be realized through specific logic circuits.

FIG. 9 is a second schematic diagram of the structure and composition of the device for binding data flow according to the embodiment of the present application. As shown in FIG. 9, the device includes: a sending unit 901.

In an embodiment, the sending unit 901 is configured to send a second request message to a first core network element or a second core network element, and the second request message includes a binding policy, and the binding The policy includes at least one of the following: the attribute information of the data flow, the correspondence between the PDU session and the RAT, the indication message of whether to support the multi-connection function, and the indication message of whether to trigger the multi-connection, wherein the attribute message includes at least one of the following : Packet characteristic message, Application id.

In one embodiment, the multi-connection function includes at least a dual-connection function. Further, the dual connection function is a first dual connection function or a second dual connection function;

The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element;

The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling.

Further, the second request message includes a session establishment request message or a session modification request message.

Further, the second request message sent by the terminal includes a binding relationship, and the binding relationship is used to indicate that the established and / or modified data flow and / or session is bound to an access network element .

In the above solution, the second request message sent by the terminal includes a correspondence relationship, and the correspondence relationship is used to indicate that a data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages. Further, when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message.

In another implementation manner, the sending unit 901 is configured to send a second request message to a first core network element or a second core network element, wherein when the second request message is sent multiple times, it is different The data flow and / or session established and / or modified by the second request message of the user needs to be bound to different access network elements for transmission.

Those skilled in the art should understand that the implementation function of each unit in the apparatus for binding data flow shown in FIG. 9 can be understood by referring to the related description of the foregoing method for binding data flow. The functions of the units in the device for binding data flow shown in FIG. 9 can be realized through programs running on the processor, and can also be realized through specific logic circuits.

If the device for binding data flow in the embodiment of the present application is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the present application that are essentially or contribute to the existing technology can be embodied in the form of software products. The computer software product is stored in a storage medium and includes several instructions to make A computer device (which may be a personal computer, a server, or a network device) executes all or part of the methods described in the embodiments of the present application. The aforementioned storage media include: various types of media that can store program codes, such as a flash drive, a removable hard disk, a read only memory (ROM, Read Only Memory), a magnetic disk, or an optical disk. In this way, the embodiments of the present application are not limited to any specific combination of hardware and software.

Correspondingly, an embodiment of the present application further provides a computer storage medium in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, the method for implementing the foregoing data binding process in the embodiment of the present application is provided.

FIG. 10 is a schematic structural composition diagram of a computer device according to an embodiment of the present application. The computer device may be a terminal or a network device. As shown in FIG. 10, the computer device 100 may include one or more (only one shown in the figure) a processor 1002 (the processor 1002 may include but is not limited to a microprocessor (MCU, Micro Controller Unit) or programmable logic Processing devices such as devices (FPGA, Field Programmable Gate Array), memory 1004 for storing data, and transmission device 1006 for communication functions. A person of ordinary skill in the art can understand that the structure shown in FIG. 10 is only for illustration, and does not limit the structure of the electronic device. For example, the computer device 100 may further include more or fewer elements than those shown in FIG. 10, or have a different configuration from that shown in FIG. 10.

The memory 1004 can be used to store software programs and modules of application software, such as program instructions / modules corresponding to the methods in the embodiments of the present application. The processor 1002 runs the software programs and modules stored in the memory 1004, thereby Perform various functional applications and data processing, that is, to achieve the above method. The memory 1004 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 1004 may further include memory remotely disposed relative to the processor 1002, and these remote storages may be connected to the computer device 100 through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

The transmission device 1006 is used for receiving or transmitting data via a network. The above specific examples of the network may include a wireless network provided by a communication provider of the computer device 100. In an example, the transmission device 1006 includes a network interface card (NIC), which can be connected to other network devices through the base station to communicate with the Internet. In one example, the transmission device 1006 may be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

The technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

In the several embodiments provided in this application, it should be understood that the disclosed method and smart device may be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or elements may be combined or may be combined. Integration into another system, or some features can be ignored or not implemented. In addition, the coupling or direct coupling or communication connection between the components shown or discussed can be through some interfaces, indirect coupling or communication connection of the device or unit, and can be electrical, mechanical or other forms of.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, which may be located in one place or distributed to multiple network units. ; Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into a second processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into a unit; The above integrated unit may be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above is only a specific implementation of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the protection scope of this application.

201, 202, 601, 602, 603, 604, 605, 701‧‧‧ steps

801‧‧‧Receiving unit

802‧‧‧Binding Unit

803‧‧‧Storage Unit

804, 901‧‧‧ sending unit

100‧‧‧Computer equipment

1002‧‧‧Processor

1004‧‧‧Memory

1006‧‧‧Transmission device

The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

FIG. 1 is an existing networking mode;

FIG. 2 is a first schematic flowchart of a method for binding a data flow according to an embodiment of the present application; FIG.

FIG. 3 is a schematic diagram of a case-one correspondence of a data binding process according to an embodiment of the present application; FIG.

FIG. 4 is a schematic diagram corresponding to case 2 of a data binding process according to an embodiment of the present application; FIG.

5 (a) is a first schematic diagram of a DC architecture according to an embodiment of the present application;

5 (b) is a second schematic diagram of a DC architecture according to an embodiment of the present application;

6 is a second schematic flowchart of a method for binding data flow according to an embodiment of the present application;

FIG. 7 is a third flowchart of a method for binding data flow according to an embodiment of the present application;

FIG. 8 is a first schematic diagram of the structure and composition of an apparatus for binding data according to an embodiment of the present application; FIG.

FIG. 9 is a schematic diagram of the structure and composition of a device for binding data according to an embodiment of the present application.

FIG. 10 is a schematic structural diagram of a computer device according to an embodiment of the present application.

Claims (25)

A method for binding data flow, the method includes: The first access network element receives a data flow establishment request message or a modification request message in a PDU session sent by the first core network element; The first access network element binds each to-be-established or to-be-modified data flow and / or session and / or at least one tunnel to a radio bearer of a corresponding RAT according to the establishment request message or modification request message. The at least one tunnel is used for transmitting data between the core network and the access network. The method according to item 1 of the scope of patent application, wherein the establishment request message or modification request message includes a first instruction message, and the first instruction message includes at least one of the following: The correspondence between the data flow instruction message and the RAT instruction message corresponding to the data flow to be created or modified; Correspondence between tunnel information and RAT indication message corresponding to at least one tunnel. The method according to item 2 of the scope of patent application, wherein the first indication message further includes an indication message of whether the data flow to be established or modified is offloaded and / or an indication message of whether uplink and downlink transmissions correspond to the same RAT; The indication message of whether to offload is used to indicate whether the data flow is transmitted under multiple RATs. The method according to item 2 or item 3 of the patent application scope, wherein one data flow and / or tunnel corresponds to one RAT indication message or multiple RAT indication messages. The method according to item 4 of the scope of patent application, wherein when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message. The method according to item 1 of the scope of patent application, wherein the establishment request message or modification request message includes a second instruction message, and the second instruction message includes a data flow instruction message corresponding to a data flow to be created or modified ; A first configuration message is stored on the network element side of the first access network, and the first configuration message includes RAT indication messages corresponding to different data flow indication message ranges. The method according to item 6 of the scope of patent application, wherein the first access network element binds each to-be-created or to-be-modified data flow and / or session according to the establishment request message or modification request message. The radio bearers under the corresponding RAT include: The first access network element determines, according to the second instruction message and the first configuration message, a RAT corresponding to each data flow to be created or to be modified, and assigns each data to be created or to be modified Processes and / or sessions are bound to radio bearers under the corresponding RAT. The method according to item 6 or item 7 of the patent application scope, wherein the first configuration message is statically configured on the network element side of the first access network, or the first configuration message is configured by the core network side Or sent by the network management side to the network element of the first access network. The method according to any one of items 6 to 7 of the scope of patent application, wherein the second indication message is generated by the first core network element based on a binding policy, and the binding policy includes at least the following One: the attribute information of the data flow, the correspondence between the PDU session and the RAT, the indication message of whether the multi-connection function is supported, and the indication message of whether the multi-connection is triggered, wherein the attribute message includes at least one of the following: packet characteristics Message, Application id. The method according to item 9 of the scope of patent application, wherein the binding policy is stored in a contract message, and when the terminal performs registration or PDU session establishment, the first core network element receives the contract message from Obtaining the binding policy from the signing message. The method according to any one of items 1-3, 5-7, or 10 in the scope of the patent application, wherein a DRAT and / or a RAT corresponding to S-NSSAI is configured in the contract message, so that the The first core network element determines a RAT corresponding to a PDU session established or modified based on the DNN and / or S-NSSAI according to the subscription message, and the first core network element sends the first access network element to the first access network element. The sent setup request message or modification request message carries a third indication message, and the third indication message is used to indicate a RAT corresponding to the PDU session. The method according to any one of claims 1-3, 5-7, or 10 in the scope of patent application, wherein the data flow to be established or modified and / or at least one tunnel and corresponding RAT The binding operation of the lower radio bearer is triggered in the following manner: the second core network element sends a first request message to the first core network element. The method according to item 12 of the scope of patent application, wherein the first request message is sent by a third-party server to the second core network element, and the second core network element is forwarded to the second core network element A core network element. The method according to any one of claims 1 to 3 or 5 to 7 or 10, wherein the method further comprises: The terminal sends a second request message to the first core network element or the second core network element; and / or, a third-party server sends a second request message to the first core network element or the second core network. For the network element, the second request message includes a binding policy, and the binding policy includes at least one of the following: information on each attribute of the data flow, the correspondence between the PDU session and the RAT, an indication message of whether the multi-connection function is supported, An indication message of whether to trigger multi-connection, wherein the attribute information includes at least one of the following: a packet characteristic message and an Application ID. The method according to any one of claims 1-3, 5-7, or 10 in the scope of patent application, wherein the method further includes: The first access network element binds each to-be-established or to-be-modified data flow and / or session and / or at least one tunnel to a radio bearer of a corresponding RAT, and then sends the data flow to the first core network. Yuan sends a confirmation message. A method for binding data flow, the method includes: The terminal sends a second request message to the first core network element or the second core network element. The second request message includes a binding policy, and the binding policy includes at least one of the following: each attribute information of the data flow. , The correspondence between the PDU session and the RAT, an indication message of whether the multi-connection function is supported, or an indication message of whether the multi-connection function is triggered, wherein the attribute information includes at least one of the following: a packet characteristic message, and an application id. The method according to item 16 of the patent application scope, wherein the multi-connection function includes at least a dual-connection function. The method according to item 17 of the scope of patent application, wherein the dual connection function is a first dual connection function or a second dual connection function; The first dual connection function means that at least one third core network element is connected to the first access network element and the second access network element respectively; Data is transmitted through a tunnel between the first access network element and the at least one third core network element, and data on the second access network element side passes through the second access network element Tunnel transmission with the at least one third core network element; The second dual connection function means that at least one third core network element is connected to the first access network element, and the first access network element is connected to the second access network element. Connection; the data of the first access network element is transmitted through the tunnel between the first access network element and the at least one third core network element, and the second access network element Side data is forwarded to the first access network element through the second access network element, and passes between the first access network element and the at least one third core network element Tunneling. The method according to any one of items 16 to 18 of the scope of patent application, wherein the second request message includes a session establishment request message or a session modification request message. The method according to any one of items 16 to 18 of the scope of patent application, wherein the second request message sent by the terminal includes a binding relationship, which is used to indicate that The modified data flow and / or session is bound to an access network element. The method according to any one of items 16 to 18 of the scope of patent application, wherein the second request message sent by the terminal includes a correspondence relationship, which is used to indicate a data flow and / Or the tunnel corresponds to one RAT indication message or multiple RAT indication messages. The method according to item 21 of the scope of patent application, wherein when one data flow and / or tunnel corresponds to multiple RAT instruction messages, each of the multiple RAT instruction messages corresponds to a priority message. A method for binding data flow, the method includes: The terminal sends a second request message to the first core network element or the second core network element, and when the terminal sends the second request message multiple times, data created and / or modified by different second request messages Processes and / or sessions need to be bound to different access network elements for transmission. A network device includes a memory and a processor. The memory stores computer-executable instructions. When the computer-executable instructions are executed by the processor, the network device executes the first patent application range from 1 to The method step of any one of item 15. A terminal device includes a memory and a processor. The memory stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the terminal device executes any of the patent application scopes 16 to 22 The method steps described in one item, or the method steps described in item 23 of the scope of patent application.