CN104066121A - Wireless local area network distribution method, device and system - Google Patents

Abstract

The invention discloses a stream dividing method, device and system of a wireless local area network. The stream dividing method of the wireless local area network includes that when user equipment prepares for switching to a second access network from a first access network, discovering and selecting a strategy according to an access network, determining that the priority of the wireless local area network WLAN is higher than that of the second access network, wherein the first access network and the second access network are different in a third-generation mobile communication partner program 3GPP communication system; transmitting all the data stream through the WLAN or transmitting one part of data stream through the WLAN, switching to the second access network, and transmitting the other part of data stream through the second access network. The stream dividing method, device and system of the wireless local area network solve the problems of the prior art that the user equipment UE cannot use the surrounding WLAN network resources when switching between different wireless access networks in the 3GPP network, so that the WLAN network resources are wasted, and the business quality of the user equipment UE is influenced.

Description

Wireless local area network distribution method, device and system

technical field

Embodiments of the present invention relate to the field of communication technologies, and in particular, to a wireless local area network distribution method, device, and system.

Background technique

The third generation partnership project (3rd Generation Partnership Project, 3GPP) standards organization stipulates the wireless local area network (Wireless Local Access Network, WLAN) offload (offload) standard, that is, the user equipment (User Equipment, UE) can use it in the 3GPP network In the contract, access the Internet (Internet) through the WLAN access network, so as to realize the switching of data flow from the 3GPP network to the WLAN network, reduce the load of the 3GPP access network, and improve user experience.

However, based on the 3GPP standards, when the user equipment is handed over between different radio access networks in the 3GPP network, if the radio access network resources of the target cell are insufficient, the current call quality of the UE will be reduced or the session will be interrupted, thereby affecting Quality of service of the UE.

Contents of the invention

The present invention provides a wireless local area network distribution method, device and system, which are used to improve the service quality of the UE when the UE switches between different wireless access networks in the 3GPP network and the wireless access network resources of the target cell are insufficient.

In a first aspect, the present invention provides a wireless local area network distribution method, including:

During the handover preparation stage of handover from the first access network to the second access network, the user equipment determines that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection strategy, The first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system;

Transmit all data flows through the WLAN, or transmit a part of the data flows through the WLAN, and switch to the second access network, and transmit another part of the data flows through the second access network.

Based on the first aspect, in a first possible implementation manner, before the handover preparation phase of handover from the first access network to the second access network, the user equipment further includes:

The user equipment detects a handover event according to a handover event parameter, and prepares to perform handover from the first access network to the second access network when a handover event is detected; or,

The user equipment receives a handover preparation notification message sent by the first network device, and the handover preparation notification message includes at least second access network information to indicate that the user equipment is ready to perform handover from the first access network For the second access network, the first network device includes a core network device and/or an access network device of the first access network.

Based on the first possible implementation of the first aspect, in a second possible implementation, before the user equipment detects a handover event according to a handover event parameter, the method further includes:

The user equipment receives the access network discovery and selection policy sent by the access network discovery and selection functional entity, where the access network discovery and selection policy includes the handover event parameter; or

The user equipment receives the measurement configuration parameter sent by the access network device of the first access network, where the measurement configuration parameter includes the handover event parameter.

Based on the first aspect or the first or second possible implementation of the first aspect, in a third possible implementation, the access network discovery and selection strategy further includes Priority information between the wireless access network and the wireless local area network WLAN.

Based on the first aspect or any one of the first to third possible implementations of the first aspect, in a fourth possible implementation, the transmitting all data streams through the WLAN includes:

The user equipment does not support data stream transmission through the second access network and the WLAN at the same time, and then transmits all data streams through the wireless local area network WLAN.

Based on the first aspect or any one of the first to third possible implementations of the first aspect, in a fifth possible implementation, the WLAN transmits a part of the data stream and switches to the second An access network, transmitting another part of the data flow through the second access network, including:

If the user equipment supports data stream transmission through the second access network and the WLAN at the same time, and the user equipment determines according to the access network discovery and selection policy that only a part of the data stream can be transmitted through the WLAN, but:

While transmitting a part of the data flow through the WLAN, performing handover from the first access network to the second access network, and transmitting another part of the data flow through the second access network; or,

After a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second access network. access the network, and transmit another part of the data flow through the second access network.

Based on the first possible implementation manner of the first aspect, in a sixth possible implementation manner, after transmitting a part of the data stream through the WLAN and switching to the second access network, through the first During the transmission of another part of the data stream by the access network, it includes:

When performing a handover execution phase from the first access network to the second access network, the user equipment sends a handover completion message to an access network device of the second access network, and the handover The completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN; or,

When performing a handover preparation phase from the first access network to the second access network, the user equipment sends a handover preparation notification response message to the first network device, the handover preparation notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network.

Based on the sixth possible implementation of the first aspect, in the seventh possible implementation, if the handover completion message or the handover preparation notification response message further includes when carrying information;

In the process of transmitting a part of the data stream through the WLAN, switching to the second access network, and transmitting another part of the data stream through the second access network, further comprising:

After performing handover from the first access network to the second access network, the user equipment releases 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN.

In a second aspect, an embodiment of the present invention provides a wireless local area network offloading method, including:

The user equipment receives a handover preparation failure message sent by the second network device, where the handover preparation failure message includes at least information about the second access network, and is used to notify the user equipment to switch from the first access network to the second access network. 2. The handover preparation of the access network fails;

According to the access network discovery and selection strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmit all data streams through the WLAN;

The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system.

In a third aspect, the present invention provides a user equipment, including:

A determining module, configured to determine that the priority of the wireless local area network WLAN is higher than that of the second access network according to the access network discovery and selection strategy during the handover preparation stage from the first access network to the second access network Priority, the first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system;

The transmission module is configured to transmit all data streams through the WLAN, or transmit a part of the data streams through the WLAN, and switch to the second access network, and transmit another part of the data streams through the second access network.

Based on the third aspect, in a first possible implementation manner, the user equipment further includes:

The detection module is used to perform handover event detection according to the handover event parameters before the handover preparation stage of the handover from the first access network to the second access network in the determination module, and prepare to execute the handover event from the handover event when the handover event is detected. switching the first access network to the second access network; or

A receiving module, configured to receive a handover preparation notification message sent by the first network device before the handover preparation phase of the determination module switching from the first access network to the second access network, and the handover preparation notification message at least includes Second access network information, used to indicate that the user equipment is ready to perform handover from the first access network to the second access network, where the first network device includes a core of the first access network network equipment and/or access network equipment.

Based on the first possible implementation of the third aspect, in a second possible implementation, the detection module includes:

The first receiving unit is configured to receive the access network discovery and selection policy sent by the access network discovery and selection functional entity before performing handover event detection according to the handover event parameter, and the access network discovery and selection policy includes said handover event parameter; or

The method is configured to receive a measurement configuration parameter sent by an access network device of the first access network before performing handover event detection according to the handover event parameter, where the measurement configuration parameter includes the handover event parameter.

Based on the third aspect or the first or second possible implementation of the third aspect, in the third possible implementation, the access network discovery and selection strategy further includes the Priority information between network access and the wireless local area network WLAN.

Based on the third aspect or any one of the first to third possible implementation manners of the third aspect, in a fourth possible implementation manner, the transmission module is specifically configured to pass the If the second access network transmits data streams with the WLAN, all data streams are transmitted through the wireless local area network WLAN.

Based on the third aspect or any of the first to third possible implementations of the third aspect, in a fifth possible implementation, the transmission module is specifically configured to:

If the user equipment supports data flow transmission through the second access network and the WLAN at the same time, and it is determined according to the access network discovery and selection policy that only a part of the data flow can be transmitted through the WLAN, then:

performing handover from the first access network to the second access network while transmitting a part of the data flow through the WLAN, and transmitting another part of the data flow through the second access network; or

After a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second access network. access the network, and transmit another part of the data flow through the second access network.

Based on the first possible implementation of the third aspect, in a sixth possible implementation, the transmission module includes:

a first sending unit, configured to send a handover completion message to an access network device of the second access network when performing a handover execution phase from the first access network to the second access network, The handover completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN; or,

The second sending unit is configured to send a handover preparation notification response message to the first network device when performing a handover preparation phase from the first access network to the second access network, the handover preparation The notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network.

Based on the sixth possible implementation of the third aspect, in the seventh possible implementation, if the handover completion message or the handover preparation notification response message further includes When the bearer information does not include the bearer information corresponding to the data stream transmitted by the WLAN; the transmission module further includes:

A release unit, configured to release the 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN after the handover from the first access network to the second access network is performed.

In a fourth aspect, an embodiment of the present invention provides a user equipment, including:

A receiving module, configured to receive a handover preparation failure message sent by a second network device, where the handover preparation failure message includes at least second access network information, and is used to notify the user equipment to switch from the first access network to The handover preparation of the second access network fails;

A determination module, configured to determine that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection strategy;

A transmission module, configured to transmit all data streams through the WLAN;

The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system.

In a fifth aspect, the present invention provides a wireless local area network offloading method, including:

The first network device sends a handover preparation notification message to the user equipment during the handover preparation stage when the user equipment is handed over from the first access network to the second access network, and the handover preparation notification message includes at least the second access network information, used to instruct the user equipment to prepare to perform handover from the first access network to the second access network, so that the user equipment, according to the access network discovery and selection policy, if it determines that the wireless local area network WLAN If the priority is higher than that of the second access network, all data streams are transmitted through the WLAN, or a part of the data streams are transmitted through the WLAN and switched to the second access network, and transmitted through the first The second access network transmits another part of the data flow;

The first network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are third-generation mobile communication partnership project 3GPP Different wireless access networks within the communication system.

Based on the fifth aspect, in a first possible implementation manner, after sending the handover preparation notification message to the user equipment, the first network device further includes:

The first network device receives a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network;

The first network device sends a handover request message to another network device according to the bearer information corresponding to the data flow to be transmitted on the second access network included in the handover preparation notification response message, and the handover request message includes the bearer information corresponding to the data flow to be transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN, and the other network device includes the access information of the second access network network equipment and/or core network equipment.

In a sixth aspect, the present invention provides a wireless local area network offloading method, including:

When the handover preparation of the user equipment from the first access network to the second access network fails, the second network device sends a handover preparation failure message to the user equipment, and the handover preparation failure message includes at least the second Access network information, so that the user equipment, according to the access network discovery and selection policy, transmits all data streams through the wireless local area network WLAN if it is determined that the priority of the WLAN is higher than the priority of the second access network ;

The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system.

In a seventh aspect, the present invention provides a network device located on the side of the first access network, the network device includes core network equipment and/or access network equipment of the first access network, and the first access network The network and the second access network are different wireless access networks within the 3GPP communication system of the third generation mobile communication partnership project, including:

A sending module, configured to send a handover preparation notification message to the user equipment during the handover preparation phase when the user equipment is handed over from the first access network to the second access network, and the handover preparation notification message includes at least the second access network Network information, used to instruct the user equipment to prepare to perform handover from the first access network to the second access network, so that the user equipment, according to the access network discovery and selection policy, determines that the wireless local area network WLAN higher than the priority of the second access network, transmit all the data streams through the WLAN, or transmit a part of the data streams through the WLAN, and switch to the second access network, through the The second access network transmits another part of the data flow.

Based on the seventh aspect, in a first possible implementation manner, after the sending module sends a handover preparation notification message to the user equipment;

The receiving module is further configured to receive a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data stream to be transmitted on the second access network;

The sending module is further configured to send a handover request message to another network device according to the bearer information corresponding to the data flow to be transmitted on the second access network included in the handover preparation notification response message received by the receiving module The handover request message includes the bearer information corresponding to the data flow to be transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN, and the other network device includes the second Access network equipment and/or core network equipment of the access network.

In an eighth aspect, the present invention provides a network device located on the side of the first access network, the network device includes core network equipment and/or access network equipment of the first access network, and the first access network The network and the second access network are different wireless access networks within the 3GPP communication system of the third generation mobile communication partnership project, including:

A sending module, configured to send a handover preparation failure message to the user equipment when the handover preparation of the user equipment from the first access network to the second access network fails, and the handover preparation failure message includes at least the first Two access network information, so that the user equipment transmits all data through the wireless local area network WLAN if the priority of the WLAN is determined to be higher than the priority of the second access network according to the access network discovery and selection strategy flow;

The network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are the third generation mobile communication partnership project 3GPP communication system Internal different wireless access networks.

In a ninth aspect, the present invention provides a wireless local area network offloading system, including: user equipment, network equipment, and an access network discovery and selection functional entity;

The user equipment is the user equipment described in the third aspect above, and the network device is the network device described in the seventh aspect above; or,

The user equipment is the user equipment described in the fourth aspect above, and the network device is the network device described in the eighth aspect above;

The access network discovery and selection functional entity is configured to send an access network discovery and selection policy to the user equipment, and the access network discovery and selection policy includes different radio access networks within the 3GPP communication system Priority information with the wireless local area network WLAN, so that when the user equipment detects a handover event during the handover preparation phase from the first access network to the second access network, according to the access network discovery and Selecting a strategy, if it is determined that the priority of the WLAN is higher than the priority of the second access network, then transmit all data streams through the WLAN, or transmit a part of data streams through the WLAN, and switch to the second access network. Two access networks, through which another part of the data flow is transmitted, the first access network and the second access network are different wireless access networks within the third generation mobile communication partnership project 3GPP .

Based on the ninth aspect, in a first possible implementation manner, the network device includes an access network device and/or a core network device of the first access network.

Based on the ninth aspect or the first possible implementation manner of the ninth aspect, in a second possible implementation manner, the access network discovery and selection policy further includes a handover event parameter.

In the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection strategy, if it is determined that the priority of the wireless local area network WLAN is higher than that of the second access network network access priority, transmit all data streams through the wireless local area network WLAN, or transmit a part of the data streams through the wireless local area network WLAN, switch to the second access network, and transmit through the second access network Another part of the data flow. When the resources of the second access network are insufficient, resulting in handover failure, or when the service quality of the user equipment is degraded after switching to the second access network, the embodiment of the present invention can transmit data streams through WLAN, improving the utilization rate of WLAN network resources , which ensures the service quality of the user equipment and improves the user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic flowchart of a wireless local area network offloading method provided by an embodiment of the present invention;

FIG. 2 is a signaling diagram of a wireless local area network offloading method provided by another embodiment of the present invention;

FIG. 3 is a schematic flowchart of a wireless local area network offloading method provided by another embodiment of the present invention;

FIG. 4 is a signaling diagram of a wireless local area network offloading method provided by another embodiment of the present invention;

FIG. 5 is a schematic flowchart of a wireless local area network offloading method provided by another embodiment of the present invention;

FIG. 6 is a signaling diagram of a wireless local area network offloading method provided by another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a user equipment provided by another embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a user equipment provided by another embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a network device provided by another embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a network device provided by another embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a network device provided by another embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a network device provided by another embodiment of the present invention;

Fig. 13 is a schematic structural diagram of a wireless local area network distribution system provided by another embodiment of the present invention;

FIG. 14 is a schematic flowchart of a wireless local area network offloading method provided by another embodiment of the present invention;

Fig. 15 is a schematic structural diagram of user equipment provided by another embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Currently, the Access Network Discovery and Selection Function (ANDSF for short) entity specified in the 3GPP standard, or the ANDSF server, provides the access network discovery and selection policy (ANDSF policy for short) provided to the UE. Choose between handover between different radio access networks within 3GPP and WLAN offload.

When the UE moves, the radio access network signal of the current 3GPP cell of the UE may be weaker than the radio access network signal of the neighboring 3GPP cell. If different, it will trigger the handover of the UE from the radio access network of the current 3GPP cell to the radio access network of the neighboring 3GPP cell, that is, the handover of the UE between different radio access networks within the 3GPP. If the radio access network resources of the neighbor 3GPP cell are insufficient and the handover fails, or the service quality drops after the UE is handed over to the radio access network of the neighbor 3GPP cell, at this time, even if there is an available WLAN access network around the UE, the ANDSF policy does not It can trigger the UE to choose between switching between different wireless access networks in the 3GPP network and WLAN offloading, so that when the UE switches between different wireless access networks in the 3GPP network, it cannot use the surrounding WLAN network resources. This leads to a waste of WLAN network resources and affects the service quality of the UE.

The wireless local area network distribution method provided by the present invention can realize data distribution by using WLAN when user equipment is switched between different wireless access networks within 3GPP.

The technical solution of the present invention can be applied to the third generation mobile communication network 3GPP system, wherein, for example, different radio access networks within 3GPP include Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) , Universal Mobile Telecommunications System (UMTS), UMTS Terrestrial Radio Access Network (UTRAN), GSM/EDGE Radio Access Network (GSM EDGE Radio Access Network, GERAN).

Fig. 1 is a schematic flowchart of a wireless local area network offloading method provided by an embodiment of the present invention. As shown in Fig. 1, the wireless local area network offloading method in this embodiment may include:

101. During the handover preparation stage of handover from the first access network to the second access network, the user equipment determines that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection policy class.

Wherein, the first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system.

In an optional implementation manner of the present invention, before the user equipment prepares to perform handover from the first access network to the second access network, the steps include:

The user equipment detects a handover event according to a handover event parameter, and prepares to perform handover from the first access network to the second access network when a handover event is detected; or

The user equipment receives a handover preparation notification message sent by a network device, and the handover preparation notification message includes at least second access network information to indicate that the user equipment is ready to perform handover from the first access network to The second access network.

Wherein, the network equipment includes access network equipment and/or core network equipment of the first access network, the access network equipment includes, for example, a base station, a radio access controller, etc., and the core network equipment includes, for example, a mobility management entity ( Mobility Management Entity, referred to as MME), general packet radio service (General Packet Radio Service, referred to as GPRS) service support nodes, etc.

In an optional implementation manner of the present invention, before the user equipment detects the handover event according to the handover event parameter, it includes:

The user equipment receives the access network discovery and selection policy sent by the access network discovery and selection functional entity, where the access network discovery and selection policy includes the handover event parameter; or

The user equipment receives the measurement configuration parameter sent by the access network device of the first access network, where the measurement configuration parameter includes the handover event parameter.

In an optional implementation manner of the present invention, the access network discovery and selection policy sent by the access network discovery and selection server further includes different wireless access networks and the wireless local area network (WLAN) within the 3GPP Priority information between.

102. Transmit all data streams through the wireless local area network WLAN.

In an optional implementation manner of the present invention, if the user equipment does not support data stream transmission through the second access network and the wireless local area network WLAN at the same time, transmit all data streams through the wireless local area network WLAN;

Optionally, after step 101, it also includes:

103. Transmit a part of the data flow through the wireless local area network WLAN, switch to the second access network, and transmit another part of the data flow through the second access network.

Steps 102 and 103 can be selected according to actual conditions.

In an optional implementation manner of the present invention, if the user equipment supports data flow transmission through the second access network and the WLAN at the same time, and the user equipment determines according to the access network discovery and selection policy Only a part of the data flow can be transmitted through the WLAN, then:

performing handover from the first access network to the second access network while transmitting a part of the data flow through the WLAN, and transmitting another part of the data flow through the second access network; or

After a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second access network. access the network, and transmit another part of the data flow through the second access network.

In an optional implementation manner of the present invention, during the process of transmitting a part of the data stream through the WLAN, switching to the second access network, and transmitting another part of the data stream through the second access network ,include:

When performing a handover execution phase from the first access network to the second access network, the user equipment sends a handover completion message to an access network device of the second access network, and the handover The completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN; or

When performing a handover preparation phase from the first access network to the second access network, the user equipment sends a handover preparation notification response message to the network device, and the handover preparation notification response message includes Bearer information corresponding to the data flow to be transmitted on the second access network.

In an optional implementation manner of the present invention, if the handover completion message or the handover preparation notification response message further includes bearer information corresponding to the data flow transmitted by the WLAN; Part of the data flow, and switched to the second access network, and the process of transmitting another part of the data flow through the second access network also includes:

After performing handover from the first access network to the second access network, the user equipment releases 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN.

In the embodiment of the present invention, when the user equipment performs handover from the first access network of the 3GPP communication system to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN is higher than that of the second access network Priority of the access network, transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass through the second access network Transmit another part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Furthermore, when the handover fails due to insufficient resources of the second access network, or when the service quality of the user equipment is degraded after switching to the second access network, the embodiment of the present invention can transmit data streams through the WLAN, which improves the utilization of WLAN network resources. The utilization rate ensures the service quality of the user equipment and improves the user experience.

Fig. 2 is a signaling diagram of a wireless local area network distribution method provided by another embodiment of the present invention; as shown in Fig. The access network (target access network) is the UTRAN of the 3GPP communication system. The network equipment of the first access network is referred to as the first network equipment, and the network equipment of the second access network is referred to as the second network equipment. The wireless LAN distribution in this embodiment The specific process of the method includes:

201. A user equipment detects a handover event from a first access network to a second access network, and prepares to perform handover from the first access network to the second access network.

During specific implementation, the user equipment may detect the handover event according to the handover event parameters included in the measurement configuration parameters sent by the access network equipment (for example, evolved Node B, eNB) of the first access network. The event of handover from the access network to the second access network is to enter the stage of preparation for handover from the first access network to the second access network, and to prepare for handover from the first access network to the second access network. or

The user equipment can detect a handover event according to the handover event parameters included in the ANDSF policy sent by the ANDSF functional entity. If a handover event from the first access network to the second access network is detected, it enters the handover from the first access network In the stage of preparation and execution of the second access network, the handover from the first access network to the second access network is prepared.

For example, when the user equipment communicates through the first access network, the signal of the first access network currently used by the user equipment (usually the access network used by the current cell) may be weak due to the movement of the user equipment or changes in network conditions. Signals on the second access network (usually the access network used by neighboring cells), thereby triggering the handover of the user equipment from the first access network to the second access network. If the radio access technology (Radio Access Technology, RAT for short) adopted by the first access network and the second access network is different, this handover is called an inter-RATHandover event between different access networks within 3GPP. For example, switching from E-UTRAN to UTRAN.

It should be noted that, in order to realize that the above-mentioned user equipment can detect handover events according to the handover event parameters provided by the ANDSF policy, in this embodiment, the management object (ManagementObject, MO for short) of the ANDSF policy is extended as follows: add handover events to the ANDSF MO An event trigger node (EventTrigger Node), the handover event trigger node is preset with handover event parameters. Wherein, the switching event parameters include an event name and/or a trigger parameter corresponding to the event name. For example, the event name is Inter-RAT Handover (Inter-RAT Handover) or service fallback to circuit switching network (CSFallback, CSFB). The triggering parameters of the handover or CSFB meet the occurrence conditions of the handover between access networks or the CSFB event, and the handover event can be triggered.

202. The user equipment determines, according to the ANDSF policy, that the priority of the WLAN is higher than the priority of the second access network.

In one embodiment, the MO of ANDSF can be extended as follows:

On the basis of the access technology type WLAN included in the access technology (Access Technology) parameter of the existing ANDSF MO, a new access technology type is added: 3GPP_EUTRAN, 3GPP_UTRAN, 3GPP_GERAN; the priority of the access network in the ANDSF MO Level (Access Network Priority) parameter to indicate priority information, therefore, this embodiment obtains 3GPP_EUTRAN, 3GPP_UTRAN, 3GPP_GERAN through the Access Technology (Access Technology) parameter and the Access Network Priority (Access Network Priority) parameter provided by ANDSF MO Priority information between WLAN and WLAN. Optionally, new values such as EUTRA_CI, UTRAN_CI, and GERAN_CI can also be added to the access cell identifier (Access ID) or access secondary cell identifier (Secondary Access ID) parameter in ANDSF MO, which are used to indicate the use of 3GPP specific access A specific cell of an incoming technology, where CI is a cell ID (Cell ID). Therefore, the user equipment can determine whether the priority of the WLAN is higher than that of the second access network according to the ANDSF policy.

Assuming that the user equipment detects that there is an available WLAN around, and according to the ANDSF policy, it is determined that the priority of the WLAN is higher than that of the second access network, the user equipment determines to initiate WLAN offloading.

If the user equipment determines to initiate WLAN offloading, further:

Assuming that the user equipment supports the transmission of data streams through 3GPP and WLAN at the same time, the user equipment needs to determine which data streams to transmit through the WLAN according to the Inter-System Routing Policy (Inter-System Routing Policy, ISRP for short) of ANDSF, that is, according to the Internet Protocol in ISRP (Internet Protocol, referred to as IP) data flow (flow) description information to determine the data flow transmitted through the WLAN. If there is a data flow that cannot be transmitted through the WLAN according to the ISRP, the user equipment may choose to switch it to the second access network and transmit it through the second access network.

Assuming that the user equipment does not support data stream transmission through 3GPP and WLAN at the same time, UE can transmit all data streams through WLAN according to the Inter-System Mobility Policy (Inter-System Mobility Policy, ISMP for short) of ANDSF.

Assuming that the user equipment determines that the priority of the WLAN is lower than the priority of the second access network according to the ANDSF policy, at this time, the user equipment needs to report the measurement result of the handover event detection according to the handover event parameters to the network device (the first access network) network access network equipment or core network equipment), and execute the Inter-RAT HO process specified in the 3GPP standard, the present invention will not repeat the Inter-RAT HO process specified in the 3GPP standard.

203. Perform WLAN offloading, and transmit all or part of the data streams through the WLAN.

Here, the data flow may be transmitted in the form of a data flow following the IP protocol.

Specifically, the user equipment can initiate and execute WLAN offload to the network according to the procedures specified in the current 3GPP WLAN offload-related standards, through non-seamless offload (Non-Seamless Offload) or seamless offload (Seamless Offload, or EPC routed), Transmit all or part of the data stream through the WLAN. Among them, the non-seamless offload means that the data flow is directly connected to the service network through the WLAN access network; the seamless offload means that the data flow is connected to the 3GPP core network through the WLAN access network, and then the 3GPP core network is connected to the service network. I won't go into details here.

If in step 203, part of the data flow is transmitted through the WLAN, the method further includes:

204. Switch from the first access network to the second access network, and transmit another part of the data flow through the second access network.

In this case, steps 203 and 204 may be performed simultaneously or sequentially, which is not limited in the present invention.

Assuming that step 203 is executed while step 204 is executed, the user equipment needs to report the measurement result of handover event detection according to the handover event parameters to the network equipment of the first access network, assuming that the first access network is E-UTRAN of 3GPP, here , the user equipment needs to report the measurement results to the evolved base station (evolved Node B, eNB for short), and the eNB initiates the Inter-RAT HO process. For the specific process, refer to the Inter-RAT HO process specified in the 3GPP standard.

It should be noted that the user equipment needs to determine the bearer information corresponding to the data flow that needs to be handed over to the second access network according to the data flow information determined in step 202 that cannot be transmitted through the WLAN. Specifically, the user equipment may determine the bearer information corresponding to the data flow according to a traffic flow template (Traffic Flow Template, TFT for short). Wherein, in order to avoid repeated transmission of the data stream in the WLAN and the second access network, during the handover of the user equipment from the first access network to the second access network:

When the user equipment initiates handover to the second access network (such as UTRAN), the handover completion (Handover to UTRAN Complete) message sent by the user equipment to the second access network includes the data flow that needs to be handed over to the second access network The corresponding bearer information, excluding the bearer information corresponding to the data transmitted through the WLAN;

Or, after the user equipment performs handover from the first access network to the second access network, releasing the 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN; specifically Specifically, the user equipment sends a bearer modification or bearer release request to a network device of the second access network, or receives a bearer modification or bearer release request from a network device of the second access network, wherein the bearer modification or bearer release request carries and distributes The bearer information corresponding to the data flow transmitted to the WLAN releases the 3GPP communication resources corresponding to the data flow offloaded to the WLAN transmission in the second access network, so that the data flow transmitted through the WLAN can be avoided in the second access of 3GPP Repeated transmission in the network. Here, the network devices of the second access network include access network devices and/or core network devices of the second access network.

Assume that when step 204 is executed after step 203 is executed, that is, after the WLAN offload is completed, the user equipment can release the 3GPP communication resource corresponding to the data flow offloaded to the WLAN transmission by initiating a network connection update or bearer update of the packet data flow, and then, Then continue to execute the subsequent Inter-RAT HO process according to the 3GPP standard until the Inter-RAT HO is completed, that is, the data flow not distributed to the WLAN is switched to the second access network for transmission. This also avoids repeated transmission of data streams in the WLAN and the second access network.

In the embodiment of the present invention, when the user equipment performs handover from the first 3GPP access network to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN is higher than that of the second access network network priority, then transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and transmit another data stream through the second access network part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Furthermore, when the handover fails due to insufficient resources of the second access network, or when the service quality of the user equipment is degraded after switching to the second access network, the embodiment of the present invention can transmit data streams through the WLAN, which improves the utilization of WLAN network resources. The utilization rate ensures the service quality of the user equipment and improves the user experience.

FIG. 3 is a schematic flowchart of a wireless local area network offloading method provided by an embodiment of the present invention. As shown in FIG. 3 , the wireless local area network offloading method in this embodiment may include:

301. The first network device sends a handover preparation notification message to the user equipment during the handover preparation phase when the user equipment is handed over from the first access network to the second access network, and the handover preparation notification message includes at least the second access network Network access information.

Wherein, the first network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are third-generation mobile communication partners Different radio access networks within the project 3GPP communication system. The access network equipment includes, for example, a base station, a radio access controller, etc., and the core network equipment includes, for example, a mobility management entity MME, a GPRS service support node, and the like.

302. According to the access network discovery and selection policy, if the user equipment determines that the priority of the wireless local area network WLAN is higher than the priority of the second access network, transmit all data flows through the WLAN, or through the The WLAN transmits a part of the data flow, and switches to the second access network, and transmits another part of the data flow through the second access network.

In an optional implementation manner of the present invention, if the first network device is a core network device of the first access network, after the first network device sends a handover preparation notification message to the user equipment, the If the user equipment determines that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection policy, and determines that all data streams are transmitted through the WLAN:

The user equipment sends a handover preparation notification response message to the first network device, wherein the data flow information transmitted through the second access network included in the handover preparation notification response message is empty; when the first network device receives the Handover preparation notification response message; if the data flow information transmitted through the second access network included in the handover preparation notification response message is empty, determine that the handover preparation notification response message indicates that no data flow is switched to the second access network network or through the WLAN to transmit all data streams, then send a handover preparation failure message to the access network device of the first access network to notify the access network device of the first access network to switch from the first access network Handover preparation from an access network to the second access network fails.

In an optional implementation manner of the present invention, after the first network device sends the handover preparation notification message to the user equipment, the user equipment determines that the priority of the wireless local area network WLAN is higher than Priority of the second access network, and determining to transmit a part of the data flow through the WLAN, and switch to the second access network, and transmit another part of the data flow through the second access network:

The first network device receives a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network;

The first network device sends a handover request message to another network device according to the bearer information corresponding to the data flow to be transmitted on the second access network included in the handover preparation notification response message, and the handover request message includes the bearer information corresponding to the data flow to be transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN, and the other network device includes the access information of the second access network network equipment and/or core network equipment.

In the embodiment of the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN The priority of the second access network is to transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass the second access network The network transmits another part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Fig. 4 is a signaling diagram of a wireless local area network distribution method provided by another embodiment of the present invention; assuming that the first access network (source access network) is E-UTRAN of 3GPP, the second access network (target access network) For the UTRAN of 3GPP, the specific process of the wireless local area network distribution method of the present embodiment includes:

401. The first network device initiates a handover event of handing over the user equipment from the first access network to the second access network, or detects the handover event of handing over the user equipment from the first access network to the second access network.

Wherein, the first network device is a network device of the first access network, including an access network device and/or a core network device of the first access network.

During specific implementation, the first network device may be the MME of the first access network, assuming that the first access network (source access network) is E-UTRAN of 3GPP, and the eNB of the first access network sends The mobile management entity (Mobility Management Entity, MME for short) that enters the network sends a handover request (Handover Required) message, requesting the MME to send a radio network controller (Radio Network Controller, RNC for short) of the second access network (such as UTRAN), the first The Serving GPRS Support Node (SGSN) of the General Packet Radio Service (GPRS) of the second access network and the Serving Gateway (S-GW) of the second access network request Build resources.

According to the identifier of the second access network (for example, RNC identifier) in the handover request (Handover Required) message, the MME determines that the handover type is Inter-RAT Handover, and handovers to the UTRAN network.

402. The first network device sends a handover preparation notification message to the user equipment.

During specific implementation, the first network device (such as MME) sends a handover preparation notification message to the user equipment, which carries a new notification indication value indicating that the Inter-RAT Handover preparation process from E-UTRAN to UTRAN will be or is being executed, and the handover preparation notification The message carries a radio access technology (Radio Access Technology, RAT for short) type (such as UTRAN) of the second access network. Wherein, the handover preparation notification message may use existing messages such as Inter-RAT Handover preparation messages, or newly defined messages such as Handover Preparation Notification, Handover preparation Request, ForwardLocation Request and other messages.

403. The user equipment determines that the priority of the WLAN is higher than the priority of the second access network according to the ANDSF policy.

For specific implementation, reference may be made to the relevant description of step 202 in the embodiment shown in FIG. 2 , and details are not repeated here.

404. Execute WLAN offloading, and transmit all or part of the data streams through the WLAN.

Assuming that the user equipment supports transmission of data streams through 3GPP and WLAN at the same time, the user equipment may transmit all or part of the data streams through the WLAN.

Assuming that the user equipment does not support data stream transmission through 3GPP and WLAN at the same time, the user equipment determines to transmit all data streams through the WLAN according to the Inter-System Mobility Policy (Inter-System Mobility Policy, ISMP for short) of ANDSF.

When the user equipment transmits all or part of the data stream through the WLAN, the user equipment may send a handover preparation notification response message to the first network device (such as MME), specifically, for example, Notification Response/Answer, or Handover PreparationNotification Response , or Handover Preparation Response, or messages such as ForwardLocation Response, wherein the handover preparation notification response message includes the bearer information corresponding to the data flow that needs to perform Inter-RAT Handover (transmitted through the second access network), such as the packet data flow network ( The connection ID (connectionID) of Packet Data Network (PDN for short), the bearer ID (bearerID) of Evolved Packet System (EPS for short), etc. Further, the handover preparation notification response message may also include the bearer information corresponding to the data flow transmitted through the WLAN, including PDN connection ID(s), EPS bearer ID(s), etc. In this case, it is necessary to indicate that these data flows are transmitted through the WLAN . Assuming that the user equipment transmits all data streams through the WLAN, the user equipment may send the bearer information corresponding to the data streams transmitted through the second access network carried in the handover preparation notification response message sent to the first network device (such as MME) Set to NULL.

The first network device determines, according to the handover preparation notification response message sent by the user equipment, which data streams need to perform Inter-RAT HO, that is, handover to the second access network (UTRAN) for transmission.

If no data flow needs to be switched to the second access network (UTRAN) for transmission (that is, all data flows are transmitted through the WLAN), the first network device terminates the Inter-RAT HO preparation process. At this time, the first network device sends a handover preparation failure (Handover Preparation Failure) message to the user equipment. The handover preparation failure message may carry a failure reason value, such as WLAN offloadperformed or Handover Target not allowed, to indicate the reason for the handover preparation failure.

Optionally, assuming that in step 404, a part of the data flow is transmitted through the WLAN, and another part of the data flow is transmitted through the second access network (UTRAN), then during or after performing step 404, the method further includes:

405. Switch from the first access network to the second access network, and transmit another part of the data flow through the second access network.

During specific implementation, for example, the first network device (such as MME) sends a handover request message to another network device (such as SGSN), wherein the other network device is a network device of the second access network, including the second access network The access network device and/or the core network device, the handover request message may specifically be a Forward Relocation Request (Forward Relocation Request) message, which is used to trigger a handover resource allocation process of the second access network. Wherein, the forwarding relocation request message includes the bearer information corresponding to the data flow that needs to be transmitted through the second access network, but does not include the bearer information corresponding to the data flow that needs to be transmitted through the WLAN. Specifically, the bearer information corresponding to the data flow transmitted through the second access network includes PDN connection ID(s), EPS bearer ID(s), and the like. After that, continue to execute the Inter-RAT Handover preparation (handover preparation) and Handover execution (handover execution) processes according to the existing 3GPP standard until the Inter-RAT Handover process is completed. That is: the data flow that is not distributed to the WLAN is switched to the second access network for transmission.

In the embodiment of the present invention, when the user equipment performs handover from the first 3GPP access network to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN is higher than that of the second access network network priority, then transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and transmit another data stream through the second access network part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

FIG. 5 is a schematic flowchart of a wireless local area network offloading method provided by an embodiment of the present invention. As shown in FIG. 5 , the wireless local area network offloading method in this embodiment may include:

501. The second network device sends a handover preparation failure message to the user equipment when the handover preparation of the user equipment from the first access network to the second access network fails.

Wherein, the handover preparation failure message includes the second access network information.

Wherein, the second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are third-generation mobile communication partners Different radio access networks within the project 3GPP communication system. The access network equipment includes, for example, a base station, a radio access controller, etc., and the core network equipment includes, for example, a mobility management entity MME, a GPRS service support node, and the like.

When the handover preparation stage of the handover of the user equipment from the first access network to the second access network may fail due to the failure of the second access network to allocate sufficient handover resources, the second network device sends the user equipment Sending a handover preparation failure message, where the handover preparation failure message includes at least the second access network information. Wherein, the handover preparation failure message is used to notify the user equipment that handover preparation from the first access network to the second access network fails.

502. According to the access network discovery and selection policy, if the user equipment determines that the priority of the WLAN is higher than the priority of the second access network, transmit the data flow through the wireless local area network WLAN.

In order to ensure the quality of service of the user equipment, after the user equipment receives the handover preparation failure message, according to the access network discovery and selection policy, if it is determined that the priority of the WLAN is higher than the priority of the second access network, the The data flow is transmitted through the wireless local area network WLAN. For specific implementation, reference may be made to the relevant description of step 202 in the embodiment shown in FIG. 2 , and details are not repeated here.

In the embodiment of the present invention, when the handover preparation of the user equipment from the first access network in the 3GPP communication system to the second access network fails, the user equipment may, according to the handover preparation failure message sent by the network equipment, according to the access network discovery and Selecting a strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmit the data flow through the wireless local area network WLAN. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources. The utilization rate of WLAN network resources is improved, the service quality of user equipment is guaranteed, and user experience is improved.

Fig. 6 is a signaling diagram of a wireless local area network distribution method provided by another embodiment of the present invention; assuming that the first access network (source access network) is 3GPP E-UTRAN, the second access network (target access network) It is the UTRAN of 3GPP, the second network device is the network device of the first access network, and the network device of the second access network is referred to as another network device, as shown in Figure 6, the specific process of the wireless local area network distribution method in this embodiment includes :

601. The second network device initiates a handover event from the first access network to the second access network. For specific implementation, reference may be made to the relevant description in step 401 of the embodiment shown in FIG. 4 .

602. The second network device sends a handover preparation failure message to the user equipment.

Assume that the handover preparation process for handover from the first access network to the second access network fails, for example, because the second access network (UTRAN) cannot allocate sufficient handover resources. The second network device (such as MME) sends a handover preparation failure message to the user equipment, indicating that the Inter-RATHandover preparation process from E-UTRAN to UTRAN fails. The handover preparation failure message carries the RAT type of the second access network (such as UTRAN), and may also carry a failure cause value, such as Handover Failure In Target System or Handover Target not allowed.

Wherein, the handover preparation failure message may be a notification (Notification) message, which carries a new notification indication value indicating that the Inter-RAT Handover preparation process from E-UTRAN to UTRAN fails, such as Inter-RAT Handover preparation failure; or handover preparation failure message It can be a newly defined message, such as Handover Preparation Failure Notification, or Handover preparation Failure.

603. The user equipment determines that the priority of the WLAN is higher than the priority of the second access network according to the ANDSF policy.

For specific implementation, reference may be made to the relevant description of step 202 in the embodiment shown in FIG. 2 , and details are not repeated here.

604. Perform WLAN offloading, and transmit all or part of the data streams through the WLAN.

Assuming that the user equipment transmits part of the data stream through the WLAN, and the other part of the data stream cannot be transmitted through the WLAN, the user equipment can release the data stream that cannot be transmitted through the WLAN, or pass the data stream that cannot be transmitted through the WLAN through other 3GPP access WLAN transmission, or continue to be transmitted through the first access network (source access network), the part of the data flow that cannot be transmitted through the WLAN may be released due to loss of signal coverage of the source first access network.

In this embodiment, when the handover fails due to insufficient resources of the second access network, the data flow can be offloaded and transmitted through the WLAN, which improves the utilization rate of WLAN network resources, ensures the service quality of the user equipment, and improves the user experience.

Fig. 7 is a schematic structural diagram of a user equipment provided by another embodiment of the present invention; as shown in Fig. 7 , it includes:

The determination module 71 is configured to determine that the priority of the wireless local area network WLAN is higher than that of the second access network according to the access network discovery and selection strategy during the handover preparation stage from the first access network to the second access network priority, the first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system;

The transmission module 72 is configured to transmit all data streams through the WLAN, or transmit a part of the data streams through the WLAN, and switch to the second access network, and transmit another part of the data streams through the second access network.

For example, before the handover preparation stage of handover from the first access network to the second access network, the user equipment further includes:

A detection module 73, configured to detect a handover event according to a handover event parameter, and prepare to perform handover from the first access network to the second access network when a handover event is detected; or

The first receiving module 74 is configured to receive a handover preparation notification message sent by the first network device, where the handover preparation notification message includes at least second access network information, and is used to indicate that the user equipment prepares to implement switching from the The first access network is switched to the second access network, and the first network device includes a core network device and/or an access network device of the first access network.

For example, before the detection module detects the handover event according to the handover event parameter; the detection module 73 also includes:

The first receiving unit 731 is further configured to receive the access network discovery and selection policy sent by the access network discovery and selection functional entity, where the access network discovery and selection policy includes the handover event parameter; or for receiving the measurement configuration parameter sent by the access network device of the first access network, where the measurement configuration parameter includes the handover event parameter.

For example, the access network discovery and selection policy further includes priority information between different radio access networks within the 3GPP and the wireless local area network WLAN.

For example, the transmission module 72 is specifically configured to transmit all data streams through the wireless local area network WLAN when the user equipment does not support data stream transmission through the second access network and the WLAN at the same time.

For example, the transmission module 72 is specifically used for:

If the user equipment supports data flow transmission through the second access network and the WLAN at the same time, and it is determined according to the access network discovery and selection policy that only a part of the data flow can be transmitted through the WLAN, then through the While the WLAN is transmitting a part of the data stream, performing handover from the first access network to the second access network, and transmitting another part of the data stream through the second access network; or

After a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second access network. access the network, and transmit another part of the data flow through the second access network.

For example, when the transmission module 72 transmits a part of the data flow through the WLAN, and switches to the second access network, and transmits another part of the data flow through the second access network; the transmission Module 72 also includes:

The first sending unit 721 is configured to send a handover completion message to an access network device of the second access network when performing a handover execution phase from the first access network to the second access network The handover completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN; or,

The second sending unit 722 is further configured to send a handover preparation notification response message to the first network device when performing a handover preparation phase from the first access network to the second access network, the The handover preparation notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network.

For example, if the handover completion message or the handover preparation notification response message also includes bearer information corresponding to the data flow transmitted by the WLAN; the transmission module 72 further includes:

A release unit 732, configured to release the 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN after performing handover from the first access network to the second access network .

In the embodiment of the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN The priority of the second access network is to transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass the second access network The network transmits another part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Fig. 8 is a schematic structural diagram of a user equipment provided by another embodiment of the present invention; as shown in Fig. 8, the user equipment includes a processor, a memory, and a communication bus, and the memory includes instructions for implementing a wireless local area network offload method, and the memory It is connected to the processor through a communication bus. Further, the user equipment may also have a communication interface, and communicate with other network element equipment (such as network equipment) through the communication interface.

When the processor retrieves the instructions in the memory for realizing the wireless local area network distribution method, the following steps can be performed:

In the handover preparation phase from the first access network to the second access network, according to the access network discovery and selection policy, it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, the The first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system;

Transmit all data flows through the WLAN, or transmit a part of the data flows through the WLAN, and switch to the second access network, and transmit another part of the data flows through the second access network.

For example, before the handover preparation phase from the first access network to the second access network, it includes:

performing handover event detection according to handover event parameters, and preparing to perform handover from the first access network to the second access network when a handover event is detected; or

receiving a handover preparation notification message sent by the first network device, where the handover preparation notification message includes at least second access network information to indicate that the user equipment prepares to perform handover from the first access network to the In the second access network, the first network equipment includes core network equipment and/or access network equipment of the first access network.

For example, before handover event detection according to handover event parameters, include:

receiving the access network discovery and selection policy sent by the access network discovery and selection functional entity, where the access network discovery and selection policy includes the handover event parameter; or

receiving the measurement configuration parameter sent by the access network device of the first access network, where the measurement configuration parameter includes the handover event parameter.

For example, the access network discovery and selection policy further includes priority information between different radio access networks within the 3GPP and the wireless local area network WLAN.

For example, the transmission of all data streams through the WLAN includes:

The user equipment does not support data stream transmission through the second access network and the WLAN at the same time, and then transmits all data streams through the wireless local area network WLAN.

For example, the transmitting a part of the data flow through the WLAN, switching to the second access network, and transmitting another part of the data flow through the second access network includes:

If the user equipment supports data stream transmission through the second access network and the WLAN at the same time, and the user equipment determines according to the access network discovery and selection policy that only a part of the data stream can be transmitted through the WLAN, but:

performing handover from the first access network to the second access network while transmitting a part of the data stream through the WLAN, and transmitting another part of the data stream through the second access network;

Or, after a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second second access network, and transmit another part of the data flow through the second access network.

For example, the process of transmitting a part of the data flow through the WLAN, switching to the second access network, and transmitting another part of the data flow through the second access network includes:

When performing a handover execution phase from the first access network to the second access network, the user equipment sends a handover completion message to an access network device of the second access network, and the handover The completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN;

Or, when the user equipment performs a handover preparation phase from the first access network to the second access network, it sends a handover preparation notification response message to the first network device, and the handover preparation notification The response message includes bearer information corresponding to the data flow to be transmitted on the second access network.

For example, if the handover completion message or the handover preparation notification response message also includes bearer information corresponding to the data flow transmitted by the WLAN;

In the process of transmitting a part of the data stream through the WLAN, switching to the second access network, and transmitting another part of the data stream through the second access network, further comprising:

After performing handover from the first access network to the second access network, the user equipment releases 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN.

In the embodiment of the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the first access network The priority of the second access network is to transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass the second access network The network transmits another part of the data stream. It can solve the problem in the prior art that when the UE switches between different wireless access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

9 is a schematic structural diagram of a network device provided by another embodiment of the present invention; located on the side of the first access network, the network device includes a core network device and/or an access network device of the first access network, so The first access network and the second access network are different wireless access networks within the 3GPP communication system of the third generation mobile communication partnership project. As shown in FIG. 9, the network equipment includes:

The sending module 91 is configured to send a handover preparation notification message to the user equipment during the handover preparation stage when the user equipment is handed over from the first access network to the second access network, and the handover preparation notification message includes at least the second access network Network access information, so that the user equipment transmits all data streams through the WLAN if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection strategy, Or transmit a part of the data flow through the WLAN, switch to the second access network, and transmit another part of the data flow through the second access network.

For example, if the network device is the core network device of the first access network, after the sending module 91 sends the handover preparation notification message to the user equipment; the network device further includes:

A receiving module 92, configured to receive a handover preparation notification response message sent by the user equipment;

A determining module 93, configured to determine that the handover preparation notification response message indicates that no data flow is switched to the second access network or that all data flows are transmitted through the WLAN;

The sending module 91 is further configured to send a handover preparation failure message to the access network device of the first access network, to notify the access network device of the first access network to switch from the first access network The handover preparation of the network handover to the second access network fails.

For example, after the sending module 91 sends a handover preparation notification message to the user equipment;

The receiving module 92 is further configured to receive a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data stream to be transmitted on the second access network;

The sending module 91 is further configured to send a handover message to another network device according to the bearer information corresponding to the data flow to be transmitted on the second access network included in the handover preparation notification response message received by the receiving module 91. request message, the handover request message includes bearer information corresponding to the data flow to be transmitted on the second access network, but does not include bearer information corresponding to the data flow transmitted on the WLAN, and the other network device includes Access network equipment and/or core network equipment of the second access network.

In the embodiment of the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN The priority of the second access network is to transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass the second access network The network transmits another part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Fig. 10 is a schematic structural diagram of a network device provided by another embodiment of the present invention; located on the side of the first access network, the network device includes a core network device and/or an access network device of the first access network, so The first access network and the second access network are different wireless access networks within the third generation mobile communication partnership project 3GPP communication system, as shown in Figure 10, the network equipment includes: a processor, a memory and A communication bus, the processor is connected to the memory through the communication bus, and the memory stores instructions for implementing the wireless local area network offloading method. Further, the network device also includes a communication interface through which it communicates with other network element devices (such as user equipment) communication connection.

When the processor retrieves the instructions in the memory for realizing the wireless local area network distribution method, the following steps can be performed:

In the handover preparation stage when the user equipment is handed over from the first access network to the second access network, a handover preparation notification message is sent to the user equipment, and the handover preparation notification message includes at least information about the second access network, so that If the user equipment determines that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection policy, then transmit all data streams through the WLAN, or transmit all data streams through the WLAN Part of the data flow is switched to the second access network, and another part of the data flow is transmitted through the second access network.

For example, if the network device is the core network device of the first access network, after sending the handover preparation notification message to the user equipment, include:

receiving a handover preparation notification response message sent by the user equipment;

If it is determined that the handover preparation notification response message indicates that no data stream is handed over to the second access network or all data streams are transmitted through the WLAN; then send a handover preparation failure to the access network device of the first access network A message, used to notify the access network equipment of the first access network that the handover preparation from the first access network to the second access network fails.

For example, after sending the handover preparation notification message to the user equipment, it includes:

receiving a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data stream to be transmitted on the second access network;

According to the bearer information corresponding to the data flow to be transmitted on the second access network included in the received handover preparation notification response message, send a handover request message to another network device, and the handover request message includes the information to be transmitted on the second access network. The bearer information corresponding to the data flow transmitted by the second access network does not include the bearer information corresponding to the data flow transmitted by the WLAN, and the other network device includes an access network device and/or core of the second access network network equipment.

In the embodiment of the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN The priority of the second access network is to transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass the second access network The network transmits another part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Fig. 11 is a schematic structural diagram of a network device provided by another embodiment of the present invention; located on the side of the first access network, the network device includes a core network device and/or an access network device of the first access network, so The first access network and the second access network are different wireless access networks within the 3GPP communication system of the third generation mobile communication partnership project, as shown in FIG. 11 , including:

The sending module 10 is configured to send a handover preparation failure message to the user equipment when the handover preparation of the user equipment from the first access network to the second access network fails, and the handover preparation failure message includes at least the Information about the second access network, so that the user equipment, according to the access network discovery and selection strategy, passes through the wireless local area network WLAN if it is determined that the priority of the WLAN is higher than the priority of the second access network Transmit all data streams.

In the embodiment of the present invention, when the handover preparation of the user equipment from the first access network in the 3GPP communication system to the second access network fails, the user equipment may, according to the handover preparation failure message sent by the network equipment, according to the access network discovery and Selecting a policy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmitting all data streams through the wireless local area network WLAN. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources. The utilization rate of WLAN network resources is improved, the service quality of user equipment is guaranteed, and user experience is improved.

Fig. 12 is a schematic structural diagram of a network device provided by another embodiment of the present invention; located on the side of the first access network, the network device includes a core network device and/or an access network device of the first access network, so The first access network and the second access network are different wireless access networks within the 3GPP communication system of the third generation mobile communication partnership project. As shown in FIG. 12, the network equipment includes: a processor, a memory and A communication bus, the processor is connected to the memory through the communication bus, and the memory stores instructions for implementing the wireless local area network offloading method. Further, the network device also includes a communication interface through which it communicates with other network element devices (such as user equipment) communication connection.

When the processor retrieves the instructions in the memory for realizing the wireless local area network distribution method, the following steps can be performed:

When the handover preparation of the user equipment from the first access network to the second access network fails, send a handover preparation failure message to the user equipment, and the handover preparation failure message includes at least the second access network information so that the user equipment transmits all data streams through the wireless local area network WLAN if it is determined that the priority of the WLAN is higher than the priority of the second access network according to the access network discovery and selection policy.

In the embodiment of the present invention, when the handover preparation of the user equipment from the first access network in the 3GPP communication system to the second access network fails, the user equipment may, according to the handover preparation failure message sent by the network equipment, according to the access network discovery and Selecting a strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmit the data flow through the wireless local area network WLAN. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources. The utilization rate of WLAN network resources is improved, the service quality of user equipment is guaranteed, and user experience is improved.

FIG. 13 is a schematic structural diagram of a wireless local area network distribution system provided by another embodiment of the present invention, as shown in FIG. 13 , including: user equipment 31, network equipment 32, and access network discovery and selection functional entity 33;

The user equipment 31 is the user equipment described in the embodiment shown in FIG. 7 or FIG. 8 , and the relevant content of the user equipment 31 refers to the relevant description in the embodiment shown in FIG. 7 or FIG. 8 , and details are not repeated here;

The network device 32 may be the network device described in the embodiment shown in FIG. 9 or FIG. 10 , or the network device described in the embodiment shown in FIG. 11 or FIG. 12 ; for the relevant content of the network device 32, refer to FIG. The network device described in the embodiment shown in FIG. 10 , or refer to related descriptions in the network device described in the embodiment shown in FIG. 11 or FIG. 12 , will not be repeated here.

Wherein, the network device 31 includes the access network device and/or core network device of the first access network, the access network device includes, for example, a base station, a radio access controller, etc., and the core network device includes, for example, a mobility management entity MME, GPRS service support node, etc.

The access network discovery and selection functional entity 33 is configured to send an access network discovery and selection policy to the user equipment, and the access network discovery and selection policy includes different wireless access networks within the 3GPP communication system Network and the priority information between the wireless local area network WLAN, so that the user equipment discovers the According to the selection policy, if it is determined that the priority of the WLAN is higher than the priority of the second access network, transmit all data streams through the WLAN, or transmit a part of the data streams through the WLAN, and switch to the A second access network, transmitting another part of the data flow through the second access network.

Wherein, the first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system.

The access network discovery and selection functional entity 33 is further configured to send the access network discovery and selection policy to the user equipment, and the access network discovery and selection policy also includes handover event parameters, so that the user The device 31 detects a handover event according to the handover event parameter.

In the embodiment of the present invention, when the user equipment performs handover from the first access network inside the 3GPP communication system to the second access network, according to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN The priority of the second access network is to transmit all data streams through the wireless local area network WLAN, or transmit a part of data streams through the wireless local area network WLAN, switch to the second access network, and pass the second access network The network transmits another part of the data stream. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources.

Fig. 14 is a schematic flowchart of a wireless local area network offloading method provided by another embodiment of the present invention, as shown in Fig. 14 , including:

1401. The user equipment receives a handover preparation failure message sent by a second network device, where the handover preparation failure message includes at least second access network information, and is used to notify the user equipment to switch from the first access network to the second access network. The handover preparation of the second access network fails;

1402. According to the access network discovery and selection policy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, transmit all data streams through the WLAN;

For specific implementation of step 1402, reference may be made to relevant content in the embodiment shown in FIG. 1 .

Wherein, the second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are third-generation mobile communication partners Different radio access networks within the project 3GPP communication system.

In the embodiment of the present invention, when the handover preparation of the user equipment from the first access network in the 3GPP communication system to the second access network fails, the user equipment may, according to the handover preparation failure message sent by the network equipment, according to the access network discovery and Selecting a strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmit the data flow through the wireless local area network WLAN. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources. The utilization rate of WLAN network resources is improved, the service quality of user equipment is guaranteed, and user experience is improved.

Fig. 15 is a schematic structural diagram of a user equipment provided by another embodiment of the present invention, as shown in Fig. 15 , including:

The receiving module 1501 is configured to receive a handover preparation failure message sent by a second network device, where the handover preparation failure message includes at least second access network information, and is used to notify the user equipment to switch from the first access network Handover preparation to the second access network fails;

A determination module 1502, configured to determine, according to the access network discovery and selection policy, that the priority of the wireless local area network WLAN is higher than the priority of the second access network;

A transmission module 1503, configured to transmit all data streams through the WLAN;

The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system.

In the embodiment of the present invention, when the handover preparation of the user equipment from the first access network in the 3GPP communication system to the second access network fails, the user equipment may, according to the handover preparation failure message sent by the network equipment, according to the access network discovery and Selecting a strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmit the data flow through the wireless local area network WLAN. It can solve the problem in the prior art that when the UE switches between different radio access networks in the 3GPP network, it cannot use the surrounding WLAN network resources, resulting in waste of WLAN network resources. The utilization rate of WLAN network resources is improved, the service quality of user equipment is guaranteed, and user experience is improved.

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

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part 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 invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium in the form of codes. The above codes are stored in a computer-readable storage medium, and include several instructions for causing a processor or a hardware circuit to execute some or all steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: a miniature high-capacity mobile storage disk without a physical drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, ROM for short), and a random access memory (English: Random Access Memory). AccessMemory, referred to as RAM), magnetic disk or optical disk and other media that can store program code.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims (27)

1. A wireless local area network distribution method, characterized in that, comprising: During the handover preparation stage of handover from the first access network to the second access network, the user equipment determines that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection strategy, The first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system; Transmit all data flows through the WLAN, or transmit a part of the data flows through the WLAN, and switch to the second access network, and transmit another part of the data flows through the second access network. 2. The method according to claim 1, further comprising: The user equipment detects a handover event according to a handover event parameter, and prepares to perform handover from the first access network to the second access network when a handover event is detected; or, The user equipment receives a handover preparation notification message sent by the first network device, and the handover preparation notification message includes at least second access network information to indicate that the user equipment is ready to perform handover from the first access network For the second access network, the first network device includes a core network device and/or an access network device of the first access network. 3. The method according to claim 2, further comprising: before the user equipment performs handover event detection according to handover event parameters: The user equipment receives the access network discovery and selection policy sent by the access network discovery and selection functional entity, where the access network discovery and selection policy includes the handover event parameter; or The user equipment receives the measurement configuration parameter sent by the access network device of the first access network, where the measurement configuration parameter includes the handover event parameter. 4. The method according to any one of claims 1-3, wherein the access network discovery and selection strategy also includes different wireless access networks and the wireless local area network (WLAN) in the 3GPP communication system. Priority information between. 5. The method according to any one of claims 1-4, wherein the transmitting all data streams through the WLAN comprises: The user equipment does not support data stream transmission through the second access network and the WLAN at the same time, and then transmits all data streams through the wireless local area network WLAN. 6. The method according to any one of claims 1-4, characterized in that, transmitting a part of the data stream through the WLAN, and switching to the second access network, and passing through the second access network Transmit another part of the data stream, including: If the user equipment supports data stream transmission through the second access network and the WLAN at the same time, and the user equipment determines according to the access network discovery and selection policy that only a part of the data stream can be transmitted through the WLAN, but: While transmitting a part of the data flow through the WLAN, performing handover from the first access network to the second access network, and transmitting another part of the data flow through the second access network; or, After a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second access network. access the network, and transmit another part of the data flow through the second access network. 7. The method according to claim 2, characterized in that, after transmitting a part of the data flow through the WLAN, and switching to the second access network, another part of the data is transmitted through the second access network The flow process includes: When performing a handover execution phase from the first access network to the second access network, the user equipment sends a handover completion message to an access network device of the second access network, and the handover The completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN; or, When performing a handover preparation phase from the first access network to the second access network, the user equipment sends a handover preparation notification response message to the first network device, the handover preparation notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network. 8. The method according to claim 7, wherein if the handover completion message or the handover preparation notification response message further includes bearer information corresponding to the data flow transmitted by the WLAN, In the process of transmitting a part of the data stream through the WLAN, switching to the second access network, and transmitting another part of the data stream through the second access network, further comprising: After performing handover from the first access network to the second access network, the user equipment releases 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN. 9. A wireless local area network distribution method, characterized in that, comprising: The user equipment receives a handover preparation failure message sent by the second network device, where the handover preparation failure message includes at least information about the second access network, and is used to notify the user equipment to switch from the first access network to the second access network. 2. The handover preparation of the access network fails; According to the access network discovery and selection strategy, if it is determined that the priority of the wireless local area network WLAN is higher than the priority of the second access network, then transmit all data streams through the WLAN; The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system. 10. A user equipment, characterized in that, comprising: A determining module, configured to determine that the priority of the wireless local area network WLAN is higher than that of the second access network according to the access network discovery and selection strategy during the handover preparation stage from the first access network to the second access network Priority, the first access network and the second access network are different wireless access networks within the 3rd Generation Partnership Project 3GPP communication system; The transmission module is configured to transmit all data streams through the WLAN, or transmit a part of the data streams through the WLAN, and switch to the second access network, and transmit another part of the data streams through the second access network. 11. The user equipment according to claim 10, characterized in that, before the handover preparation phase from the first access network to the second access network, the user equipment further comprises: The detection module is used to perform handover event detection according to the handover event parameters before the handover preparation stage of the handover from the first access network to the second access network in the determination module, and prepare to execute the handover event from the handover event when the handover event is detected. switching the first access network to the second access network; or The first receiving module is configured to receive a handover preparation notification message sent by the first network device before the handover preparation phase of the determination module switching from the first access network to the second access network, in which the handover preparation notification message is including at least second access network information, used to indicate that the user equipment is ready to perform handover from the first access network to the second access network, and the first network device includes the first access network core network equipment and/or access network equipment. 12. The user equipment according to claim 11, wherein the detection module comprises: The first receiving unit is configured to receive the access network discovery and selection policy sent by the access network discovery and selection functional entity before performing handover event detection according to the handover event parameter, and the access network discovery and selection policy includes said handover event parameter; or The method is configured to receive a measurement configuration parameter sent by an access network device of the first access network before performing handover event detection according to the handover event parameter, where the measurement configuration parameter includes the handover event parameter. 13. The user equipment according to any one of claims 10-12, characterized in that, the access network discovery and selection strategy further includes the communication between different radio access networks within the 3GPP and the wireless local area network (WLAN). priority information. 14. The user equipment according to any one of claims 10-13, wherein the transmission module is specifically configured to, when the user equipment does not support simultaneous transmission through the second access network and the WLAN data streams, all data streams are transmitted through the wireless local area network WLAN. 15. The user equipment according to any one of claims 10-13, wherein the transmission module is specifically configured to: If the user equipment supports data flow transmission through the second access network and the WLAN at the same time, and it is determined according to the access network discovery and selection policy that only a part of the data flow can be transmitted through the WLAN, then: performing handover from the first access network to the second access network while transmitting a part of the data flow through the WLAN, and transmitting another part of the data flow through the second access network; or After a part of the data flow is transmitted through the WLAN, release the 3GPP communication resources in the first access network corresponding to the data flow transmitted through the WLAN, and perform handover from the first access network to the second access network. access the network, and transmit another part of the data flow through the second access network. 16. The user equipment according to claim 11, wherein the transmission module comprises: a first sending unit, configured to send a handover completion message to an access network device of the second access network when performing a handover execution phase from the first access network to the second access network, The handover completion message includes the bearer information corresponding to the data flow transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN; or, The second sending unit is configured to send a handover preparation notification response message to the first network device when performing a handover preparation phase from the first access network to the second access network, the handover preparation The notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network. 17. The user equipment according to claim 16, wherein if the handover completion message or the handover preparation notification response message further includes bearer information corresponding to the data flow transmitted by the WLAN, it is not included in the When the bearer information corresponding to the data flow transmitted by the WLAN is described, the transmission module further includes: A release unit, configured to release the 3GPP communication resources in the second access network corresponding to the data flow transmitted through the WLAN after the handover from the first access network to the second access network is performed. 18. A user equipment, characterized by comprising: A receiving module, configured to receive a handover preparation failure message sent by a second network device, where the handover preparation failure message includes at least second access network information, and is used to notify the user equipment to switch from the first access network to The handover preparation of the second access network fails; A determination module, configured to determine that the priority of the wireless local area network WLAN is higher than the priority of the second access network according to the access network discovery and selection strategy; A transmission module, configured to transmit all data streams through the WLAN; The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system. 19. A wireless local area network distribution method, characterized in that, comprising: The first network device sends a handover preparation notification message to the user equipment during the handover preparation stage when the user equipment is handed over from the first access network to the second access network, and the handover preparation notification message includes at least the second access network information, used to instruct the user equipment to prepare to perform handover from the first access network to the second access network, so that the user equipment, according to the access network discovery and selection policy, if it determines that the wireless local area network WLAN If the priority is higher than that of the second access network, all data streams are transmitted through the WLAN, or a part of the data streams are transmitted through the WLAN and switched to the second access network, and transmitted through the first The second access network transmits another part of the data flow; The first network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are third-generation mobile communication partnership project 3GPP Different wireless access networks within the communication system. 20. The method according to claim 19, further comprising: after the first network device sends the handover preparation notification message to the user equipment: The first network device receives a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data flow to be transmitted on the second access network; The first network device sends a handover request message to another network device according to the bearer information corresponding to the data flow to be transmitted on the second access network included in the handover preparation notification response message, and the handover request message includes the bearer information corresponding to the data flow to be transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN, and the other network device includes the access information of the second access network network equipment and/or core network equipment. 21. A wireless local area network distribution method, characterized in that, comprising: When the handover preparation of the user equipment from the first access network to the second access network fails, the second network device sends a handover preparation failure message to the user equipment, and the handover preparation failure message includes at least the second Access network information, so that the user equipment, according to the access network discovery and selection policy, transmits all data streams through the wireless local area network WLAN if it is determined that the priority of the WLAN is higher than the priority of the second access network ; The second network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are 3rd generation mobile communication partnership project 3GPP Different wireless access networks within the communication system. 22. A network device, located on the first access network side, the network device includes a core network device and/or an access network device of the first access network, and the first access network and the first access network The second access network is a different wireless access network within the 3GPP communication system of the third generation mobile communication partnership project, and is characterized in that it includes: A sending module, configured to send a handover preparation notification message to the user equipment during the handover preparation phase when the user equipment is handed over from the first access network to the second access network, and the handover preparation notification message includes at least the second access network Network information, used to instruct the user equipment to prepare to perform handover from the first access network to the second access network, so that the user equipment, according to the access network discovery and selection policy, determines that the wireless local area network WLAN higher than the priority of the second access network, transmit all the data streams through the WLAN, or transmit a part of the data streams through the WLAN, and switch to the second access network, through the The second access network transmits another part of the data flow. 23. The network device according to claim 22, wherein after the sending module sends the handover preparation notification message to the user equipment; The receiving module is further configured to receive a handover preparation notification response message sent by the user equipment, where the handover preparation notification response message includes bearer information corresponding to the data stream to be transmitted on the second access network; The sending module is further configured to send a handover request message to another network device according to the bearer information corresponding to the data flow to be transmitted on the second access network included in the handover preparation notification response message received by the receiving module The handover request message includes the bearer information corresponding to the data flow to be transmitted on the second access network, but does not include the bearer information corresponding to the data flow transmitted on the WLAN, and the other network device includes the second Access network equipment and/or core network equipment of the access network. 24. A network device, located on the side of the first access network, the network device includes core network equipment and/or access network equipment of the first access network, the first access network and the first access network The second access network is a different wireless access network within the 3GPP communication system of the third generation mobile communication partnership project, and is characterized in that it includes: A sending module, configured to send a handover preparation failure message to the user equipment when the handover preparation of the user equipment from the first access network to the second access network fails, and the handover preparation failure message includes at least the first Two access network information, so that the user equipment transmits all data through the wireless local area network WLAN if the priority of the WLAN is determined to be higher than the priority of the second access network according to the access network discovery and selection strategy flow; The network equipment includes access network equipment and/or core network equipment of the first access network, and the first access network and the second access network are the third generation mobile communication partnership project 3GPP communication system Internal different wireless access networks. 25. A wireless local area network offloading system, comprising: user equipment, network equipment, access network discovery and selection functional entities; The user equipment is the user equipment according to any one of claims 10-18; The network device is the network device according to any one of claims 22-23, or the network device according to claim 24; The access network discovery and selection functional entity is configured to send an access network discovery and selection policy to the user equipment, and the access network discovery and selection policy includes different radio access networks within the 3GPP communication system Priority information with the wireless local area network WLAN, so that when the user equipment detects a handover event during the handover preparation phase from the first access network to the second access network, according to the access network discovery and Selecting a strategy, if it is determined that the priority of the WLAN is higher than the priority of the second access network, then transmit all data streams through the WLAN, or transmit a part of data streams through the WLAN, and switch to the second access network. Two access networks, through which another part of the data flow is transmitted, the first access network and the second access network are different wireless access networks within the third generation mobile communication partnership project 3GPP . 26. The system according to claim 25, wherein the network equipment comprises access network equipment and/or core network equipment of the first access network. 27. The system according to claim 25 or 26, wherein the access network discovery and selection strategy further includes handover event parameters.