CN104066121B - WLAN shunt method and device, system - Google Patents

Abstract

The present invention provides a kind of WLAN shunt method and device, system, when user equipment is being switched to the handoff preparation phase of the second access network from the first access network, according to access network discovery and selection strategy, determine that WLAN WLAN priority is higher than the priority of second access network, first access network and second access network are wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems；All data streams are transmitted by the WLAN, or a part of data flow is transmitted by the WLAN, and are switched to second access network, another part data flow is transmitted by second access network.During solving to switch between different radio access networks of the UE present in prior art in 3GPP networks, can not existing wlan network resource around use, cause the waste of wlan network resource, the problem of influenceing UE quality of service.

Description

WLAN shunt method and device, system

Technical field

The present embodiments relate to communication technical field, more particularly to a kind of WLAN shunt method and device, it is System.

Background technology

3G (Third Generation) Moblie partnership projects (3rd Generation Partnership Project, 3GPP) standard group Knit and define WLAN (Wireless Local Access Network, WLAN) shunting (offload) standard, that is, use Family equipment（User Equipment, UE）Its signing in 3GPP networks can be used, is accessed by WLAN access networks because of spy Net（Internet）, so as to realize switching of the data flow from 3GPP networks to wlan network, mitigate 3GPP access networks load, improve The purpose of Consumer's Experience.

But provided based on 3GPP standards, switch when between different radio access network of the user equipment in 3GPP networks When, if the radio access network resources deficiency of Target cell, the speech quality that UE can be caused currently to carry out declines or conversation, So as to influence UE quality of service.

The content of the invention

The present invention provides a kind of WLAN shunt method and device, system, to UE in 3GPP networks not Switch between wireless access network, during the radio access network resources deficiency of Target cell, lift UE quality of service.

In a first aspect, the present invention provides a kind of WLAN shunt method, including：

User equipment is being switched to the handoff preparation phase of the second access network from the first access network, according to access network discovery with Selection strategy, determine that WLAN WLAN priority is higher than the priority of second access network, first access network It is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems with second access network；

All data streams are transmitted by the WLAN, or a part of data flow is transmitted by the WLAN, and are switched to Second access network, another part data flow is transmitted by second access network.

Based in a first aspect, in the first possible implementation, the user equipment switches from the first access network To before the handoff preparation phase of the second access network, in addition to：

The user equipment switches over event detection according to handover event parameter, and when detecting handover event, it is accurate Standby perform from first access network is switched to second access network；Or

The user equipment receives the switching that first network equipment is sent and prepares notification message, and the switching prepares notice and disappeared The second access network information is comprised at least in breath, to indicate that the user equipment is ready to carry out being switched to from first access network Second access network, the first network equipment include the equipment of the core network and/or access network equipment of first access network.

The first possible implementation based on first aspect, in second of possible implementation, in the use Before family equipment switches over event detection according to handover event parameter, in addition to：

The user equipment receives access network discovery and the access network discovery that selection functional entity is sent and selection plan Slightly, the access network discovery includes the handover event parameter with selection strategy；Or

The user equipment receives the measurement configuration parameter that the access network equipment of first access network is sent, the measurement Configuration parameter includes the handover event parameter.

First based on first aspect or first aspect or second of possible implementation, in the third possible realization In mode, the access network discovery from also include in selection strategy inside the 3GPP communication systems different wireless access network with Precedence information between the WLAN WLAN.

Based on first aspect or first aspect first to the third any possible implementation, it is possible at the 4th kind It is described that all data streams are transmitted by the WLAN in implementation, including：

The user equipment is not supported while by second access network and the WLAN transmitting data streams, then passes through institute State WLAN WLAN transmission all data streams.

Based on first aspect or first aspect first to the third any possible implementation, it is possible at the 5th kind It is described that a part of data flow is transmitted by the WLAN in implementation, and be switched to second access network, pass through described the Two access networks transmit another part data flow, including：

If the user equipment is supported simultaneously by second access network and the WLAN transmitting data streams, and the use Family equipment determines to be merely able to transmit a part of data flow by the WLAN according to the access network discovery and selection strategy, then：

While transmitting a part of data flow by the WLAN, perform from first access network and be switched to described second Access network, another part data flow is transmitted by second access network；Or

After transmitting a part of data flow by the WLAN, discharge in first access network with being passed by the WLAN The 3GPP communication resources corresponding to defeated data flow, perform from first access network and be switched to second access network, and pass through Second access network transmits another part data flow.

The first possible implementation based on first aspect, in the 6th kind of possible implementation, described logical Cross the WLAN and transmit a part of data flow, and be switched to second access network, transmitted by second access network another During partial data stream, including：

The user equipment is switched to the handover execution stage of second access network performing from first access network When, handoff completion message is sent to the access network equipment of second access network, is included in the handoff completion message described Carrying information corresponding to the data flow of second access network transmission, carrying letter corresponding to the data flow of the WLAN transmission it is not included in Breath；Or

The user equipment is switched to the handoff preparation phase of second access network performing from first access network When, send switching to the first network equipment and prepare push-notification-answer message, the switching, which prepares push-notification-answer message, to be included Will be in carrying information corresponding to the data flow that second access network is transmitted.

The 6th kind of possible implementation based on first aspect, in the 7th kind of possible implementation, if described cut Change completion message or the switching prepares to be additionally included in carrying corresponding to the data flow of the WLAN transmission in push-notification-answer message During information；

A part of data flow is transmitted by the WLAN described, and is switched to second access network, passes through described the During two access networks transmit another part data flow, in addition to：

The user equipment is being performed after first access network is switched to second access network, release described the The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in two access networks.

Second aspect, the embodiment of the present invention provide a kind of WLAN shunt method, including：

User equipment receives the switching that second network equipment is sent and prepares failed message, and the switching prepares in failed message Including at least the second access network information, to notify the user equipment to be switched to second access from first access network The switching of net prepares failure；

According to the access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than described second The priority of access network, then all data streams are transmitted by the WLAN；

Second network equipment includes the access network equipment and/or equipment of the core network of first access network, and described One access network and second access network, which are that 3G (Third Generation) Moblie partnership projects 3GPP communication systems inside is different, wirelessly to be connect Network.

The third aspect, the present invention provide a kind of user equipment, including：

Determining module, for being switched to the handoff preparation phase of the second access network from the first access network, according to access network It was found that and selection strategy, determine WLAN WLAN priority be higher than second access network priority, described first Access network and second access network are wireless access different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems Net；

Transport module, for transmitting all data streams by the WLAN, or a part of number is transmitted by the WLAN According to stream, and second access network is switched to, another part data flow is transmitted by second access network.

Based on the third aspect, in the first possible implementation, the user equipment also includes：

Detection module, for being switched to the handoff preparation phase of the second access network from the first access network in the determining module Before, event detection is switched over according to handover event parameter, and when detecting handover event, be ready to carry out from described first Access network is switched to second access network；Or

Receiving module, for being switched to the handoff preparation phase of the second access network from the first access network in the determining module Before, receive the switching that first network equipment is sent and prepare notification message, the switching prepares to comprise at least the in notification message Two access network information, to indicate that the user equipment is ready to carry out being switched to second access from first access network Net, the first network equipment include the equipment of the core network and/or access network equipment of first access network.

The first possible implementation based on the third aspect, in second of possible implementation, the detection Module includes：

First receiving unit, for before event detection is switched over according to handover event parameter, receiving access network hair The access network discovery and selection strategy now sent with selection functional entity, the access network discovery include with selection strategy The handover event parameter；Or

For before event detection is switched over according to handover event parameter, receiving the access network of first access network The measurement configuration parameter that equipment is sent, the measurement configuration parameter include the handover event parameter.

First based on the third aspect or the third aspect or second of possible implementation, in the third possible realization In mode, the access network discovery from also include in selection strategy inside the 3GPP different wireless access network with it is described wireless Precedence information between LAN WLAN.

Based on the third aspect or the third aspect first to the third any possible implementation, it is possible at the 4th kind In implementation, the transport module, specifically for the user equipment do not support and meanwhile by second access network with The WLAN transmitting data streams, then all data streams are transmitted by the WLAN WLAN.

Based on the third aspect or the third aspect first to the third any possible implementation, it is possible at the 5th kind In implementation, the transport module is specifically used for：

If the user equipment is supported simultaneously by second access network and the WLAN transmitting data streams, and according to institute State access network discovery to determine to be merely able to transmit a part of data flow by the WLAN with selection strategy, then：

While transmitting a part of data flow by the WLAN, perform from first access network and be switched to described second Access network, another part data flow is transmitted by second access network；Or

After transmitting a part of data flow by the WLAN, discharge in first access network with being passed by the WLAN The 3GPP communication resources corresponding to defeated data flow, perform from first access network and be switched to second access network, and pass through Second access network transmits another part data flow.

The first possible implementation based on the third aspect, in the 6th kind of possible implementation, the transmission Module includes：

First transmitting element, for performing the switching execution that second access network is switched to from first access network During the stage, handoff completion message is sent to the access network equipment of second access network, is included in the handoff completion message Carrying information corresponding to the data flow of the second access network transmission, it is not included in corresponding to the data flow that the WLAN is transmitted and holds Information carrying ceases；Or

Second transmitting element, for performing the switching preparation that second access network is switched to from first access network During the stage, send switching to the first network equipment and prepare push-notification-answer message, the switching prepares in push-notification-answer message Including will second access network transmit data flow corresponding to carrying information.

The 6th kind of possible implementation based on the third aspect, in the 7th kind of possible implementation, if described cut Change completion message or the switching prepares to be additionally included in carrying corresponding to the data flow of the WLAN transmission in push-notification-answer message Information, when not being included in carrying information corresponding to the data flow of the WLAN transmission；The transport module also includes：

Releasing unit, for performing after first access network is switched to second access network, described in release The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in second access network.

Fourth aspect, the embodiment of the present invention provide a kind of user equipment, including：

Receiving module, prepare failed message for receiving the switching that second network equipment is sent, the switching prepares failure The second access network information is comprised at least in message, to notify the user equipment to be switched to described from first access network The switching of two access networks prepares failure；

Determining module, for according to the access network discovery and selection strategy, determining WLAN WLAN priority Higher than the priority of second access network；

Transport module, for transmitting all data streams by the WLAN；

Second network equipment includes the access network equipment and/or equipment of the core network of first access network, and described One access network and second access network, which are that 3G (Third Generation) Moblie partnership projects 3GPP communication systems inside is different, wirelessly to be connect Network.

5th aspect, the present invention provide a kind of WLAN shunt method, including：

First network equipment is switched to the handoff preparation phase of the second access network in user equipment from the first access network, to institute To state user equipment and send switching preparation notification message, the switching prepares to comprise at least the second access network information in notification message, To indicate that the user equipment is ready to carry out being switched to second access network from first access network, so that the user Equipment is according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than second access network Priority, then all data streams are transmitted by the WLAN, or a part of data flow is transmitted by the WLAN, and be switched to Second access network, another part data flow is transmitted by second access network;

The first network equipment includes the access network equipment and/or equipment of the core network of first access network, and described One access network and second access network, which are that 3G (Third Generation) Moblie partnership projects 3GPP communication systems inside is different, wirelessly to be connect Network.

Based on the 5th aspect, in the first possible implementation, the first network equipment is sent to user equipment After switching prepares notification message, in addition to：

The first network equipment receives the switching that the user equipment is sent and prepares push-notification-answer message, and the switching is accurate Standby push-notification-answer message includes will be in carrying information corresponding to the data flow that second access network is transmitted；

The first network equipment will connect according to what the switching preparation push-notification-answer message included described second Network carrying information corresponding to the data flow of transmission, sends handover request message to another network equipment, the handover request disappears Breath includes being included in the WLAN transmission in carrying information corresponding to the data flow that second access network is transmitted Carrying information corresponding to data flow, another network equipment includes the access network equipment of the second access network and/or core net is set It is standby.

6th aspect, the present invention provide a kind of WLAN shunt method, including：

Second network equipment user equipment from the first access network be switched to the second access network switching prepare failure when, to The user equipment sends switching and prepares failed message, and the switching prepares to comprise at least second access network in failed message Information, so that the user equipment is according to the access network discovery and selection strategy, however, it is determined that WLAN priority is higher than described The priority of second access network, then all data streams are transmitted by WLAN WLAN；

Second network equipment includes the access network equipment and/or equipment of the core network of first access network, and described One access network and second access network, which are that 3G (Third Generation) Moblie partnership projects 3GPP communication systems inside is different, wirelessly to be connect Network.

7th aspect, the present invention provide a kind of network equipment, and positioned at the first access net side, the network equipment includes described The equipment of the core network and/or access network equipment of first access network, first access network and second access network are the third generations Different wireless access network inside mobile communication partnership projects 3GPP communication systems, including：

Sending module, for the handoff preparation phase of the second access network to be switched to from the first access network in user equipment, to The user equipment sends switching and prepares notification message, and comprising at least the second access network in the switching preparation notification message believes Breath, to indicate that the user equipment is ready to carry out being switched to second access network from first access network, so that described User equipment is according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN, or a part of data flow is transmitted by the WLAN, and cut Second access network is changed to, another part data flow is transmitted by second access network.

Based on the 7th aspect, in the first possible implementation, send and cut to user equipment in the sending module Change after preparation notification message；

The receiving module, it is additionally operable to receive the switching preparation push-notification-answer message that the user equipment is sent, it is described to cut Change prepare push-notification-answer message include will second access network transmission data flow corresponding to carrying information；

The sending module, the switching for being additionally operable to be received according to the receiving module prepare what push-notification-answer message included It will send handover request in carrying information corresponding to the data flow that second access network is transmitted to another network equipment and disappear Breath, the handover request message include not wrap in carrying information corresponding to the data flow that second access network is transmitted Carrying information corresponding to the data flow in WLAN transmission is included, another network equipment includes the access network of the second access network Equipment and/or equipment of the core network.

Eighth aspect, the present invention provide a kind of network equipment, and positioned at the first access net side, the network equipment includes described The equipment of the core network and/or access network equipment of first access network, first access network and second access network are the third generations Different wireless access network inside mobile communication partnership projects 3GPP communication systems, including：

Sending module, for user equipment from the first access network be switched to the second access network switching prepare failure when, Switching is sent to the user equipment and prepares failed message, and the switching prepares to comprise at least the described second access in failed message Net information, so that the user equipment is according to the access network discovery and selection strategy, however, it is determined that WLAN priority is higher than institute The priority of the second access network is stated, then all data streams are transmitted by WLAN WLAN；

The network equipment includes the access network equipment and/or equipment of the core network of first access network, and described first connects It is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems to network with second access network.

9th aspect, the present invention provide a kind of WLAN separate system, including：User equipment, the network equipment, access Net is found and selection functional entity；

The user equipment is the user equipment described in the above-mentioned third aspect, and the network equipment is above-mentioned 7th aspect institute The network equipment stated；Or

The user equipment is the user equipment described in above-mentioned fourth aspect, and the network equipment is above-mentioned eighth aspect institute The network equipment stated；

The access network discovery and selection functional entity, for sending access network discovery and selection plan to the user equipment Slightly, the access network discovery includes wireless access network different inside the 3GPP communication systems and the nothing from selection strategy Precedence information between line LAN WLAN, so that the user equipment is being switched to the second access network from the first access network Handoff preparation phase, when detecting handover event, according to access network discovery and selection strategy, however, it is determined that the priority of the WLAN Higher than the priority of second access network, then all data streams are transmitted by the WLAN, or transmit by the WLAN A part of data flow, and second access network is switched to, another part data flow is transmitted by second access network, it is described First access network and second access network are wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP.

Based on the 9th aspect, in the first possible implementation, the network equipment includes first access network Access network equipment and/or equipment of the core network.

The first possible implementation based on the 9th aspect or the 9th aspect, in second of possible implementation In, the access network discovery in selection strategy with also including handover event parameter.

The present invention user equipment perform be switched to the second access network from the first access network inside 3GPP communication systems when, According to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is preferential higher than second access network Level, then all data streams are transmitted by the WLAN WLAN, or one is transmitted by the WLAN WLAN Divided data stream, second access network is switched to, and another part data flow is transmitted by second access network.Connect when second The inadequate resource of networking, and cause handoff failure, or when user equipment is switched to quality of service after the second access network and declined, this Inventive embodiments can improve the utilization rate of wlan network resource, ensure that user equipment by WLAN transmitting data streams Quality of service, improve the Experience Degree of user.

Brief description of the drawings

In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with Other accompanying drawings are obtained according to these accompanying drawings.

Fig. 1 is the schematic flow sheet for the WLAN shunt method that one embodiment of the invention provides；

Fig. 2 is the signaling diagram for the WLAN shunt method that another embodiment of the present invention provides；

Fig. 3 is the schematic flow sheet for the WLAN shunt method that another embodiment of the present invention provides；

Fig. 4 is the signaling diagram for the WLAN shunt method that another embodiment of the present invention provides；

Fig. 5 is the schematic flow sheet for the WLAN shunt method that another embodiment of the present invention provides；

Fig. 6 is the signaling diagram for the WLAN shunt method that another embodiment of the present invention provides；

Fig. 7 is the structural representation for the user equipment that another embodiment of the present invention provides；

Fig. 8 is the structural representation for the user equipment that another embodiment of the present invention provides；

Fig. 9 is the structural representation for the network equipment that another embodiment of the present invention provides；

Figure 10 is the structural representation for the network equipment that another embodiment of the present invention provides；

Figure 11 is the structural representation for the network equipment that another embodiment of the present invention provides；

Figure 12 is the structural representation for the network equipment that another embodiment of the present invention provides；

Figure 13 is the structural representation for the WLAN separate system that another embodiment of the present invention provides;

Figure 14 is the schematic flow sheet for the WLAN shunt method that another embodiment of the present invention provides;

Figure 15 is the structural representation for the user equipment that another embodiment of the present invention provides.

Embodiment

To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.

At present, access network discovery as defined in 3GPP standards and selection function (Access Network Discovery and Selection Function, abbreviation ANDSF）Entity, or ANDSF servers, to the UE access network discoveries provided and selection Strategy（Abbreviation ANDSF strategies）The switching between UE wireless access networks different inside the 3GPP and WLAN shunt can not be triggered Between selected.

When the ue moves, in fact it could happen that the wireless access network signal of the current 3GPP cells of UE is weaker than the nothing of neighbours' 3GPP cells The situation of line access signal, it is assumed that the wireless access network of the current 3GPP cells of UE and the wireless access network of neighbours' 3GPP cells are not Together, the wireless access network that UE is switched to neighbours' 3GPP cells by the wireless access network of current 3GPP cells will be triggered, i.e.,：UE exists Switching inside 3GPP between different radio access network.If the radio access network resources deficiency of neighbours' 3GPP cells causes to switch Failure, or UE are switched to quality of service decline after the wireless access network of neighbours' 3GPP cells, now, can even if existing around UE WLAN accesses network, because ANDSF strategies can not trigger cutting between UE wireless access networks different inside the 3GPP Change and selected between WLAN shunt so that when UE switches between the different radio access network in 3GPP networks, can not be made With existing wlan network resource around, cause the waste of wlan network resource, influence UE quality of service.

A kind of WLAN shunt method provided by the invention, it is possible to achieve user equipment different radio inside 3GPP During switching between access network, WLAN can be utilized to carry out data distribution.

Technical scheme, 3 G mobile communication network 3GPP system is can apply to, wherein, inside 3GPP not The same wireless access network such as Universal Terrestrial Radio Access Network including evolution（Evolved Universal Terrestrial Radio Access Network, E-UTRAN）, UMTS（Universal Mobile Telecommunications System, UMTS）, UMTS Terrestrial radio access network（UMTS Terrestrial Radio Access Network, UTRAN）, GSM EDGE Radio Access Network（GSM EDGE Radio Access Network, GERAN）.

Fig. 1 is the schematic flow sheet for the WLAN shunt method that one embodiment of the invention provides, as shown in figure 1, this The WLAN shunt method of embodiment can include：

101st, user equipment is being switched to the handoff preparation phase of the second access network from the first access network, is sent out according to access network Now with selection strategy, determine that WLAN WLAN priority is higher than the priority of second access network.

Wherein, first access network and second access network are 3G (Third Generation) Moblie partnership projects 3GPP communication systems The internal different wireless access network of system.

In the optional embodiment of the present invention, it is ready to carry out being switched to second from the first access network in user equipment Before access network, including：

The user equipment switches over event detection according to handover event parameter, and when detecting handover event, it is accurate Standby perform from first access network is switched to second access network；Or

The switching that the user equipment receives network equipment transmission prepares notification message, and the switching prepares notification message In comprise at least the second access network information, to indicate that the user equipment is ready to carry out being switched to institute from first access network State the second access network.

Wherein, the network equipment includes the access network equipment and/or equipment of the core network of first access network, access network Equipment is such as including base station, Radio Access Controller, and equipment of the core network is for example including mobile management entity（Mobility Management Entity, abbreviation MME）, general packet radio service（General Packet Radio Service, referred to as GPRS）Serving GPRS support node etc..

In the optional embodiment of the present invention, the user equipment switches over event according to handover event parameter Before detection, including：

The user equipment receives access network discovery and the access network discovery that selection functional entity is sent and selection plan Slightly, the access network discovery includes the handover event parameter with selection strategy；Or

The user equipment receives the measurement configuration parameter that the access network equipment of first access network is sent, the measurement Configuration parameter includes the handover event parameter.

In the optional embodiment of the present invention, the access network discovery and the access of selection server transmission Net is found from also including in selection strategy inside the 3GPP between different wireless access networks and the WLAN WLAN Precedence information.

102nd, all data streams are transmitted by the WLAN WLAN.

In the optional embodiment of the present invention, if the user equipment is not supported while accessed by described second When net is with the WLAN WLAN transmitting data streams, then all data streams are transmitted by the WLAN WLAN；

Alternatively, after step 101, in addition to：

103rd, a part of data flow is transmitted by the WLAN WLAN, and is switched to second access network, led to Cross second access network and transmit another part data flow.

Step 102 and 103 can be according to actual conditions, optional one.

In the optional embodiment of the present invention, if the user equipment is supported to pass through second access network simultaneously With the WLAN transmitting data streams, and the user equipment determines to be merely able to pass through according to the access network discovery and selection strategy The WLAN transmits a part of data flow, then：

While transmitting a part of data flow by the WLAN, perform from first access network and be switched to described second Access network, another part data flow is transmitted by second access network；Or

After transmitting a part of data flow by the WLAN, discharge in first access network with being passed by the WLAN The 3GPP communication resources corresponding to defeated data flow, perform from first access network and be switched to second access network, and pass through Second access network transmits another part data flow.

In the optional embodiment of the present invention, a part of data flow is transmitted by the WLAN described, and cut Second access network is changed to, during transmitting another part data flow by second access network, including：

The user equipment is switched to the handover execution stage of second access network performing from first access network When, handoff completion message is sent to the access network equipment of second access network, is included in the handoff completion message described Carrying information corresponding to the data flow of second access network transmission, carrying letter corresponding to the data flow of the WLAN transmission it is not included in Breath；Or

The user equipment is switched to the handoff preparation phase of second access network performing from first access network When, send switching to the network equipment and prepare push-notification-answer message, the switching preparation push-notification-answer message includes will Carrying information corresponding to data flow in second access network transmission.

In the optional embodiment of the present invention, if the handoff completion message or the switching prepare push-notification-answer When carrying information corresponding to the data flow of the WLAN transmission is additionally included in message；Described one is transmitted by the WLAN Divided data stream, and second access network is switched to, during transmitting another part data flow by second access network, Also include：

The user equipment is being performed after first access network is switched to second access network, release described the The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in two access networks.

The embodiment of the present invention performs from the first access network of 3GPP communication systems in user equipment and is switched to the second access network When, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than second access network Priority, then all data streams are transmitted by the WLAN WLAN, or transmitted by the WLAN WLAN A part of data flow, second access network is switched to, and another part data flow is transmitted by second access network.Can be with Solution exists in the prior art：When UE switches between the different radio access network in 3GPP networks, can not exist around use Wlan network resource, the problem of causing the waste of wlan network resource.

Further, when the inadequate resource of the second access network causes handoff failure, or user equipment is switched to second When quality of service declines after access network, the embodiment of the present invention can improve wlan network resource by WLAN transmitting data streams Utilization rate, ensure that the quality of service of user equipment, improve the Experience Degree of user.

Fig. 2 is the signaling diagram for the WLAN shunt method that another embodiment of the present invention provides；As illustrated in fig. 2, it is assumed that First access network（Source access network）For the E-UTRAN of 3GPP communication systems, the second access network（Target access network）Communicated for 3GPP The UTRAN of system, the network equipment abbreviation first network equipment of the first access network, the network equipment referred to as second of the second access network The network equipment, the WLAN shunt method idiographic flow of the present embodiment include：

201st, user equipment detects the handover event that the second access network is switched to from the first access network, is ready to carry out from One access network is switched to the second access network.

During specific implementation, user equipment can be according to the access network equipment of the first access network（Such as evolution base station (evolved Node B,eNB）The handover event parameter detecting handover event that the measurement configuration parameter of transmission includes, if detection To the handover event that the second access network is switched to from the first access network, that is, enter from the first access network and be switched to the second access network The stage is ready to carry out, is ready to carry out being switched to the second access network from the first access network.Or

The handover event parameter detecting that the ANDSF strategies that user equipment can be sent according to ANDSF functional entitys include Handover event, if detecting the handover event that the second access network is switched to from the first access network, that is, enter and cut from the first access network That changes to the second access network is ready to carry out the stage, is ready to carry out being switched to the second access network from the first access network.

For example, when user equipment is by the first access Network Communication, because user equipment is mobile or the change of network condition, The signal for being likely to occur the first currently used access network of user equipment (be usually current area use access network) is weaker than the Two access networks（The access network that usually adjacent cell uses）Signal, so as to trigger user equipment from from the first access network to The switching of two access networks.If the wireless access technology that the first access network uses with the second access network（Radio Access Technology, abbreviation RAT）Difference, this switching are referred to as the handover event inside 3GPP between different access networks（Inter- RAT Handover), such as UTRAN is switched to by E-UTRAN.

It should be noted that in order to realize that above-mentioned user equipment can be according to the handover event parameter that ANDSF strategies provide Handover event is detected, in the present embodiment, to the management object of ANDSF strategies（Management Object, abbreviation MO）Carry out such as Lower extension：Increase handover event triggering node into ANDSF MO（EventTrigger Node）, handover event triggering node In be preset with handover event parameter.Wherein, handover event parameter includes triggering corresponding to event title and/or the event title Parameter.Such as switching (Inter-RAT Handover) or business return back to circuit switched networks between the entitled access network of event (CS Fallback, CSFB), user equipment is according to access inter-network handover or CSFB trigger parameter, between access network is detected Switching or CSFB trigger parameter meet the occurrence condition of access inter-network handover or CSFB events, you can triggering handover event.

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

In one embodiment, ANDSF MO can be carried out extended below：

In existing ANDSF MO access technology（Access Technology）The access technology type that parameter includes On the basis of WLAN, increase new access technology type：3GPP_EUTRAN,3GPP_UTRAN,3GPP_GERAN；Pass through ANDSF Access network priority in MO（Access Network Priority）Parameter indicates precedence information, therefore, the present embodiment The access technology provided by ANDSF MO（Access Technology）Parameter and access network priority（Access Network Priority）Parameter, obtain 3GPP_EUTRAN, 3GPP_UTRAN, the priority between 3GPP_GERAN and WLAN Information.Alternatively, the access cell ID in ANDSF MO（Access ID）Or access secondary cell mark（Secondary Access ID）New value, such as EUTRA_CI, UTRAN_CI, GERAN_CI can also be increased in parameter, for indicating to use The specific cell of the specific access technologies of 3GPP, wherein, CI is cell ID (Cell ID).So as to which user equipment can foundation ANDSF strategies judge whether WLAN priority is higher than the second access network.

Assuming that user equipment detects that surrounding has available WLAN, and it is tactful according to ANDSF, determine WLAN priority Higher than the priority of the second access network, then WLAN shunt is initiated in user equipment determination.

If user equipment determines to initiate WLAN shunt, further：

Assuming that user equipment is supported to need according to ANDSF's by 3GPP and WLAN transmitting data streams, user equipment simultaneously Routing policy (Inter-System Routing Policy, abbreviation ISRP) determines which data flow passing through WLAN between system It is transmitted, i.e., according to the data flow that Internet Protocol (Internet Protocol, abbreviation IP) is followed in ISRP（flow）'s Description information, it is determined that the data flow being transmitted by WLAN.If there is what can not be transmitted according to ISRP by WLAN Data flow, user equipment can be selected to switch to the second access network, transmitted by the second access network.

Assuming that user equipment is not supported while by 3GPP and WLAN transmitting data stream streams, UE is according between ANDSF system Shift strategy (Inter-System Mobility Policy, abbreviation ISMP), can be carried out all data streams by WLAN Transmission.

Assuming that user equipment is tactful according to ANDSF, determine that WLAN priority is less than the priority of the second access network, this When, user equipment needs the measurement result for switching over event detection according to handover event parameter reporting the network equipment (the The access network equipment or equipment of the core network of one access network), and Inter-RAT HO processes specified in 3GPP standards are performed, this Invention repeats no more to Inter-RAT HO processes specified in 3GPP standards.

203rd, WLAN shunt is performed, all data streams or partial data stream are transmitted by WLAN.

Here, data flow can be transmitted with following the data-stream form of IP agreement.

Specifically, user equipment can initiate according to the flow of current 3GPP WLAN shunts correlation standard to network And WLAN shunt is performed, (Non-Seamless Offload) or seamless shunting are shunted by non-seamless（Seamless Offload, or EPC routed）Mode, all data streams or partial data stream are transmitted by WLAN.Wherein, it is non- It is seamless to split into data flow directly by WLAN access network access business networks；The seamless data flow that splits into passes through WLAN access networks 3GPP core nets are accessed, and then business network is linked into by 3GPP core nets.Here repeat no more.

If for partial data stream is transmitted by WLAN in step 203, methods described also includes：

204th, the second access network is switched to from the first access network, another part data flow is transmitted by the second access network.

In this case, step 203 and 204 simultaneously or can be performed successively, and this is not limited by the present invention.

Assuming that performing 204 while step 203 is performed, user equipment needs to switch over according to handover event parameter The measurement result of event detection reports the network equipment of the first access network, it is assumed that and the first access network is 3GPP E-UTRAN, this When, user equipment needs measurement result reporting evolution base station（Evolved Node B, abbreviation eNB）, initiated by eNB Inter-RAT HO processes, detailed process may be referred to Inter-RAT HO processes specified in 3GPP standards.

It should be noted that user equipment is needed according to the number that can not be transmitted by WLAN determined in step 202 According to stream information, it is determined that needing to be switched to carrying information corresponding to the data flow of the second access network.Specifically, user equipment can be according to Carrying information corresponding to data flow is determined according to traffic flow template (Traffic Flow Template, abbreviation TFT).Wherein, in order to Avoid data flow from repeating to transmit in WLAN and the second access network, the second access network is switched to from the first access network in user equipment During:

When user equipment is to the second access network（Such as UTRAN）When initiating switching, user equipment is sent out to the second access network The switching sent is completed（Handover to UTRAN Complete）Message includes needing the data for being switched to the second access network Carrying information corresponding to stream, without carrying information corresponding to the data including being transmitted by WLAN；

Or user equipment is being performed after first access network is switched to second access network, described in release The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in second access network；Specifically, user equipment is to The network equipment of two access networks sends bearing modification or carrying releasing request, or receives carrying from the network equipment of the second access network The data flow pair of WLAN transmission is carried and is diverted in modification or carrying releasing request, wherein bearing modification or carrying releasing request The carrying information answered, it will be released in the second access network with being diverted to the corresponding 3GPP communication resources of data flow of WLAN transmission Put, repeat to transmit in 3GPP the second access network so as to avoid passing through the data flow of WLAN transmission.Here the second access The network equipment of net includes the access network equipment and/or equipment of the core network of the second access network.

Assuming that when performing 204 after performing step 203, i.e., after WLAN shunt is completed, user equipment can pass through Packet data streams network connection renewal or bearer update are initiated, 3GPP communications money corresponding to the data flow of WLAN transmission will be diverted to Source is discharged, and then continues executing with follow-up Inter-RAT HO flows according to 3GPP standards regulation, until Inter-RAT HO is completed, i.e.,：The data flow for not being diverted to WLAN is switched in the second access network and is transmitted.It so it also avoid data flow Repeat to transmit in WLAN and the second access network.

The embodiment of the present invention is when user equipment performs and is switched to the second access network from 3GPP the first access network, according to connecing Network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the priority of second access network, then All data streams are transmitted by the WLAN WLAN, or a part of data are transmitted by the WLAN WLAN Stream, is switched to second access network, and transmit another part data flow by second access network.Can solve existing skill Exist in art：, can not existing wlan network around use when UE switches between the different radio access network in 3GPP networks Resource, the problem of causing the waste of wlan network resource.

Further, when the inadequate resource of the second access network causes handoff failure, or user equipment is switched to second When quality of service declines after access network, the embodiment of the present invention can improve wlan network resource by WLAN transmitting data streams Utilization rate, ensure that the quality of service of user equipment, improve the Experience Degree of user.

Fig. 3 is the schematic flow sheet for the WLAN shunt method that one embodiment of the invention provides, as shown in figure 3, this The WLAN shunt method of embodiment can include：

301st, first network equipment is switched to the handoff preparation phase of the second access network in user equipment from the first access network, Switching is sent to the user equipment and prepares notification message, and comprising at least the second access network in the switching preparation notification message believes Breath.

Wherein, the first network equipment includes the access network equipment and/or equipment of the core network of first access network, institute It is nothings different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems to state the first access network and second access network Line access.For access network equipment such as including base station, Radio Access Controller, equipment of the core network is for example real including mobile management Body MME, GPRS serving GPRS support node etc..

302nd, the user equipment is according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority Higher than the priority of second access network, then all data streams are transmitted by the WLAN, or transmit by the WLAN A part of data flow, and second access network is switched to, another part data flow is transmitted by second access network.

In the optional embodiment of the present invention, if the first network equipment is the core of first access network During net equipment, the first network equipment to user equipment send switching prepare notification message after, the user equipment according to Access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the priority of second access network, And when determining to transmit all data streams by the WLAN：

User equipment sends switching to first network equipment and prepares push-notification-answer message, wherein, switching prepares push-notification-answer The traffic flow information transmitted by the second access network that message includes is sky；When first network equipment receives the user equipment The switching of transmission prepares push-notification-answer message；If passed according to what switching preparation push-notification-answer message included by the second access network Defeated traffic flow information is sky, determines that the switching prepares push-notification-answer message and indicates that no data flow handoff connects to described second Network or all data streams are transmitted by the WLAN, then sending switching to the access network equipment of first access network prepares to lose Message is lost, to notify the access network equipment of first access network to be switched to second access network from first access network Switching prepare failure.

In the optional embodiment of the present invention, the first network equipment sends switching to user equipment and prepares to lead to After knowing message, the user equipment is according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority Higher than the priority of second access network, and determine by a part of data flow of WLAN transmission, and be switched to described the Two access networks, when transmitting another part data flow by second access network：

The first network equipment receives the switching that the user equipment is sent and prepares push-notification-answer message, and the switching is accurate Standby push-notification-answer message includes will be in carrying information corresponding to the data flow that second access network is transmitted；

The first network equipment will connect according to what the switching preparation push-notification-answer message included described second Network carrying information corresponding to the data flow of transmission, sends handover request message to another network equipment, the handover request disappears Breath includes being included in the WLAN transmission in carrying information corresponding to the data flow that second access network is transmitted Carrying information corresponding to data flow, another network equipment includes the access network equipment of the second access network and/or core net is set It is standby.

The embodiment of the present invention is switched to second from the first access network inside 3GPP communication systems in user equipment execution and connect During networking, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN WLAN, or pass through the WLAN WLAN A part of data flow is transmitted, is switched to second access network, and another part data flow is transmitted by second access network. Can solve to exist in the prior art：, can not be around use when UE switches between the different radio access network in 3GPP networks Existing wlan network resource, the problem of causing the waste of wlan network resource.

Fig. 4 is the signaling diagram for the WLAN shunt method that another embodiment of the present invention provides；Assuming that the first access network （Source access network）For 3GPP E-UTRAN, the second access network（Target access network）For 3GPP UTRAN, the present embodiment it is wireless LAN shunt method idiographic flow includes：

401st, first network equipment is initiated for user equipment to be switched to the handover event of the second access network from the first access network, Or detect that user equipment is switched to the handover event of the second access network from the first access network.

Wherein, first network equipment be the first access network the network equipment, including the access network equipment of the first access network and/ Or equipment of the core network.

During specific implementation, the first network equipment can be the MME of the first access network, it is assumed that the first access network（Source connects Network）For 3GPP E-UTRAN, the mobile management entity of the eNB of the first access network to the first access network（Mobility Management Entity, abbreviation MME）Handover request (Handover Required) message is sent, request MME connects to second Network（Such as UTRAN）Radio network controller（Radio Network Controller, abbreviation RNC）, the second access network General packet radio service（General Packet Radio Service, abbreviation GPRS）Serving GPRS support node （Serving GPRS Support Node, abbreviation SGSN）With the gateway of the second access network（Serving Gateway, letter Claim S-GW）Resource is established in request.

The mark of the second access network in MME foundation handover request (Handover Required) message is (for example, RNC is marked Know) to determine this switching type be Inter-RAT Handover, and is switched to UTRAN networks.

402nd, first network equipment sends switching preparation notification message to user equipment.

During specific implementation, first network equipment（Such as MME）Switching is sent to user equipment and prepares notification message, wherein taking The new notice indicated value of band shows or held by E-UTRAN to UTRAN Inter-RAT Handover set-up procedures OK, switching prepares to carry the wireless access technology of the second access network in notification message（Radio Access Technology, letter Claim RAT）Type (such as UTRAN).Wherein, switching, which prepares notification message, can use existing message such as Inter-RAT Handover preparation message, or using the message newly defined, such as Handover Preparation The message such as Notification, Handover preparation Request, Forward Location Request.

403rd, user equipment determines that WLAN priority is higher than the priority of the second access network according to ANDSF strategies.

Specific implementation may be referred to the associated description of step 202 in embodiment illustrated in fig. 2, repeat no more.

404th, WLAN shunt is performed, all data streams or partial data stream are transmitted by WLAN.

Assuming that user equipment is supported while can be by all data streams by 3GPP and WLAN transmitting data streams, user equipment Or partial data stream is transmitted by WLAN.

Assuming that user equipment is not supported while by 3GPP and WLAN transmitting data stream streams, user equipment is according to ANDSF's Shift strategy (Inter-System Mobility Policy, abbreviation ISMP) between system, it is determined that all data streams are passed through WLAN is transmitted.

When all data streams or partial data stream are transmitted by user equipment by WLAN, the user equipment can be to First network equipment（Such as MME）Send switching and prepare push-notification-answer message, can specifically use such as Notification Response/Answer, or Handover Preparation Notification Response, or Handover Preparation Response, or the message such as Forward Location Response, wherein, switching prepares push-notification-answer Carrying corresponding to the data flow that message includes needing to perform Inter-RAT Handover (transmitting by the second access network) is believed Breath, such as grouped data flow network（Packet Data Network, abbreviation PDN）Connection identifier（connection ID）、 The carrying mark of the grouping system (Evolved Packet System, abbreviation EPS) of evolution（bearer ID）Deng.Further Ground, switching prepare to include by carrying information corresponding to the data flow of WLAN transmission, including PDN in push-notification-answer message Connection ID (s), EPS bearer ID (s) etc., now need to indicate that these data flows are transmitted by WLAN.Assuming that All data streams are transmitted by user equipment by WLAN, then user equipment can will be sent to first network equipment（Such as MME）Switching prepare push-notification-answer message in carry by the second access network transmit data flow corresponding to carrying information set For empty (NULL).

The switching that first network equipment is sent according to user equipment prepares push-notification-answer message, determines which data flow needs Inter-RAT HO are performed, that is, are switched to the second access network（UTRAN）It is transmitted.

If no data flow needs to be switched to the second access network（UTRAN）It is transmitted（I.e. all data streams all pass through WLAN is transmitted）, then first network equipment stop Inter-RAT HO set-up procedures.Now, first network equipment is to user equipment Send switching and prepare failure（Handover Preparation Failure）Message.Switching prepares to carry in failed message Failure reason value, such as WLAN offload performed or Handover Target not allowed, to indicate to switch The reason for preparing failure.

Alternatively, it is assumed that for a part of data flow is transmitted by WLAN in step 404, the circulation of another part data Cross the second access network (UTRAN）It is transmitted, then also includes while step 404 is performed or afterwards：

405th, the second access network is switched to from the first access network, another part data flow is transmitted by the second access network.

During specific implementation, for example, first network equipment（Such as MME）Handover request is sent to another network equipment (such as SGSN) Message, wherein, another network equipment be the second access network the network equipment, including the access network equipment of the second access network and/or Equipment of the core network, handover request message are specifically as follows forwarding re-positioning request（Forward Relocation Request）Disappear Breath, to trigger the handover resource allocation procedure of the second access network.Wherein, forward RELOCATION REQUEST message to include needs to pass through Carrying information corresponding to the data flow of second access network transmission, without including needing by being held corresponding to the data flow of WLAN transmission Information carrying ceases.Specifically, carrying information corresponding to the data flow transmitted by the second access network includes PDN connection ID (s), EPS bearer ID (s) etc..Afterwards, Inter-RAT Handover are continued executing with according to existing 3GPP standards Preparation (switching prepares) and Handover execution (switching performs) process, until completing Inter-RAT Handover process.I.e.：The data flow for not being diverted to WLAN is switched in the second access network and is transmitted.

The embodiment of the present invention is when user equipment performs and is switched to the second access network from 3GPP the first access network, according to connecing Network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the priority of second access network, then All data streams are transmitted by the WLAN WLAN, or a part of data are transmitted by the WLAN WLAN Stream, is switched to second access network, and transmit another part data flow by second access network.Can solve existing skill Exist in art：, can not existing wlan network around use when UE switches between the different radio access network in 3GPP networks Resource, the problem of causing the waste of wlan network resource.

Fig. 5 is the schematic flow sheet for the WLAN shunt method that one embodiment of the invention provides, as shown in figure 5, this The WLAN shunt method of embodiment can include：

501st, second network equipment is switched to the switching preparation failure of the second access network in user equipment from the first access network When, send switching to the user equipment and prepare failed message.

Wherein, the switching, which prepares failed message, includes the second access network information.

Wherein, second network equipment includes the access network equipment and/or equipment of the core network of first access network, institute It is nothings different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems to state the first access network and second access network Line access.For access network equipment such as including base station, Radio Access Controller, equipment of the core network is for example real including mobile management Body MME, GPRS serving GPRS support node etc..

When user equipment is being switched to the handoff preparation phase of the second access network from the first access network, may connect due to second When enough switchable resources can not be distributed by, which networking, causes switching preparation failure, second network equipment sends to the user equipment and cut Preparation failed message is changed, the switching prepares to comprise at least the second access network information in failed message.Wherein, the switching Prepare failed message to notify the user equipment from the first access network be switched to the second access network switching prepare failure.

502nd, the user equipment is according to the access network discovery and selection strategy, however, it is determined that WLAN priority is higher than institute The priority of the second access network is stated, then is transmitted the data flow by the WLAN WLAN.

After ensureing that the quality of service of user equipment, user equipment receive switching preparation failed message, according to institute State access network discovery and selection strategy, however, it is determined that WLAN priority is higher than the priority of second access network, then by described in Data flow is transmitted by the WLAN WLAN.Specific implementation may be referred to the correlation of step 202 in embodiment illustrated in fig. 2 Description, is repeated no more.

The embodiment of the present invention is switched to the second access network in user equipment from the first access network inside 3GPP communication systems Switching prepare failure when, user equipment can according to the network equipment send switching prepare failed message, according to access network send out Now with selection strategy, however, it is determined that WLAN WLAN priority be higher than second access network priority, then pass through institute State WLAN WLAN transmitting data streams.Can solve to exist in the prior art：Different radios of the UE in 3GPP networks connects When switching between networking, can not existing wlan network resource around use, the problem of causing the waste of wlan network resource.Carry The high utilization rate of wlan network resource, ensure that the quality of service of user equipment, improves the Experience Degree of user.

Fig. 6 is the signaling diagram for the WLAN shunt method that another embodiment of the present invention provides；Assuming that the first access network （Source access network）For 3GPP E-UTRAN, the second access network（Target access network）For 3GPP UTRAN, second network equipment is The network equipment of first access network, referred to as another network equipment of the network equipment of the second access network, as shown in fig. 6, the present embodiment WLAN shunt method idiographic flow include：

601st, second network equipment initiates to be switched to the handover event of the second access network from the first access network.Specific implementation When, it may be referred to the associated description in embodiment illustrated in fig. 4 step 401.

602nd, second network equipment sends switching preparation failed message to user equipment.

Assuming that the switching set-up procedure failure of the second access network is switched in the first access network, such as due to the second access network （UTRAN）Enough switchable resources can not be distributed.Second network equipment (such as MME) sends switching to user equipment and prepares unsuccessfully to disappear Breath, represent the Inter-RAT Handover set-up procedures failure by E-UTRAN to UTRAN.Switching prepares to take in failed message RAT types (such as UTRAN) with the second access network, can also carry failure reason value, such as Handover Failure In Target System or Handover Target not allowed.

Wherein, it can be notice (Notification) message that switching, which prepares failed message, refer to wherein carrying new notice Indicating value shows the Inter-RAT Handover set-up procedures failure by E-UTRAN to UTRAN, such as Inter-RAT Handover preparation failure；Or it can be the message newly defined that switching, which prepares failed message, such as Handover Preparation Failure Notification, or Handover preparation Failure etc. disappear Breath.

603rd, user equipment determines that WLAN priority is higher than the priority of the second access network according to ANDSF strategies.

Specific implementation may be referred to the associated description of step 202 in embodiment illustrated in fig. 2, repeat no more.

604th, WLAN shunt is performed, all data streams or partial data stream are transmitted by WLAN.

Assuming that user equipment transmits partial data stream by WLAN, another part data flow can not be transmitted by WLAN When, user equipment can discharge the data flow that can not be transmitted by WLAN, or the data that can not be transmitted by WLAN are circulated Other 3GPP access network transmission is crossed, or continues through the first access network（Source access network）Transmission, the part can not pass through The data flow of WLAN transmission may be released due to losing source the first access network signal covering.

The present embodiment can transmit data when the inadequate resource of the second access network causes handoff failure by WLAN shunt Stream, improves the utilization rate of wlan network resource, ensure that the quality of service of user equipment, improve the Experience Degree of user.

Fig. 7 is the structural representation for the user equipment that another embodiment of the present invention provides；As shown in fig. 7, comprises：

Determining module 71, for being switched to the handoff preparation phase of the second access network from the first access network, according to access Net is found and selection strategy, determines that WLAN WLAN priority is higher than the priority of second access network, and described the One access network and second access network, which are that 3G (Third Generation) Moblie partnership projects 3GPP communication systems inside is different, wirelessly to be connect Network；

Transport module 72, for transmitting all data streams by the WLAN, or a part is transmitted by the WLAN Data flow, and second access network is switched to, another part data flow is transmitted by second access network.

For example, before the handoff preparation phase of the second access network is switched to from the first access network, the user sets It is standby also to include：

Detection module 73, for switching over event detection according to handover event parameter, and when detecting handover event, It is ready to carry out being switched to second access network from first access network；Or

First receiving module 74, prepare notification message for receiving the switching that the first network equipment is sent, it is described Switching prepares to comprise at least the second access network information in notification message, to indicate that the user equipment is ready to carry out from described the One access network is switched to second access network, and the first network equipment includes the equipment of the core network of first access network And/or access network equipment.

For example, before the detection module switches over event detection according to handover event parameter；The detection Module 73 also includes：

First receiving unit 731, it is additionally operable to receive the access network hair that access network discovery is sent with selection functional entity Now include the handover event parameter with selection strategy with selection strategy, the access network discovery；It is or described for receiving The measurement configuration parameter that the access network equipment of first access network is sent, the measurement configuration parameter include the handover event ginseng Number.

For example, the access network discovery is from also including wireless access network different inside the 3GPP in selection strategy With the precedence information between the WLAN WLAN.

For example, the transport module 72, specifically for not supported while by described second in the user equipment Access network and the WLAN transmitting data streams, then transmit all data streams by the WLAN WLAN.

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

If the user equipment is supported simultaneously by second access network and the WLAN transmitting data streams, and according to institute State access network discovery to determine to be merely able to transmit a part of data flow by the WLAN with selection strategy, then passed by the WLAN While defeated a part of data flow, perform from first access network and be switched to second access network, connect by described second Network transmission another part data flow；Or

After transmitting a part of data flow by the WLAN, discharge in first access network with being passed by the WLAN The 3GPP communication resources corresponding to defeated data flow, perform from first access network and be switched to second access network, and pass through Second access network transmits another part data flow.

For example, a part of data flow is transmitted by the WLAN in the transport module 72, and is switched to described the Two access networks, during transmitting another part data flow by second access network；The transport module 72 also includes：

First transmitting element 721, for performing the switching that second access network is switched to from first access network During the execution stage, handoff completion message is sent to the access network equipment of second access network, is wrapped in the handoff completion message Carrying information corresponding to including the data flow in second access network transmission, the data flow for not being included in the WLAN transmission are corresponding Carrying information；Or

Second transmitting element 722, it is additionally operable to be switched to cutting for second access network from first access network in execution When changing the preparatory stage, send switching to the first network equipment and prepare push-notification-answer message, the switching prepares push-notification-answer Message includes will be in carrying information corresponding to the data flow that second access network is transmitted.

For example, if being additionally included in the handoff completion message or the switching preparation push-notification-answer message described Corresponding to the data flow of WLAN transmission during carrying information；The transport module 72 also includes：

Releasing unit 732, for performing after first access network is switched to second access network, discharge institute State the 3GPP communication resources corresponding with the data flow transmitted by the WLAN in the second access network.

The embodiment of the present invention is switched to second from the first access network inside 3GPP communication systems in user equipment execution and connect During networking, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN WLAN, or pass through the WLAN WLAN A part of data flow is transmitted, is switched to second access network, and another part data flow is transmitted by second access network. Can solve to exist in the prior art：, can not be around use when UE switches between the different radio access network in 3GPP networks Existing wlan network resource, the problem of causing the waste of wlan network resource.

Fig. 8 is the structural representation for the user equipment that another embodiment of the present invention provides；As shown in figure 8, user equipment bag Processor, memory and communication bus are included, the memory includes realizing the instruction of WLAN shunt method, described to deposit Reservoir is connected by communication bus with processor.Further, user equipment can pass through the communication interface with communication interface With other network element devices（Such as the network equipment）Communication connection.

When processor transfers the instruction that WLAN shunt method is realized in memory, following steps can be performed：

The handoff preparation phase of the second access network is being switched to from the first access network, according to access network discovery and selection plan Slightly, determine that WLAN WLAN priority is higher than the priority of second access network, first access network and described Second access network is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems；

All data streams are transmitted by the WLAN, or a part of data flow is transmitted by the WLAN, and are switched to Second access network, another part data flow is transmitted by second access network.

For example, before the handoff preparation phase of the second access network is switched to from the first access network, including：

Event detection is switched over according to handover event parameter, and when detecting handover event, is ready to carry out from described First access network is switched to second access network；Or

The switching for receiving the transmission of first network equipment prepares notification message, and the switching prepares at least to wrap in notification message The second access network information is included, is connect to indicate that the user equipment is ready to carry out being switched to described second from first access network Network, the first network equipment includes the equipment of the core network and/or access network equipment of first access network.

For example, before switching over event detection according to handover event parameter, including：

Receive the access network discovery and selection strategy that access network discovery is sent with selection functional entity, the access network It was found that include the handover event parameter with selection strategy；Or

The measurement configuration parameter that the access network equipment of first access network is sent is received, is wrapped in the measurement configuration parameter Include the handover event parameter.

For example, the access network discovery is from also including wireless access network different inside the 3GPP in selection strategy With the precedence information between the WLAN WLAN.

For example, it is described that all data streams are transmitted by the WLAN, including：

The user equipment is not supported while by second access network and the WLAN transmitting data streams, then passes through institute State WLAN WLAN transmission all data streams.

For example, it is described that a part of data flow is transmitted by the WLAN, and second access network is switched to, pass through Second access network transmits another part data flow, including：

If the user equipment is supported simultaneously by second access network and the WLAN transmitting data streams, and the use Family equipment determines to be merely able to transmit a part of data flow by the WLAN according to the access network discovery and selection strategy, then：

While transmitting a part of data flow by the WLAN, perform from first access network and be switched to described second Access network, another part data flow is transmitted by second access network；

Or after by the WLAN transmitting a part of data flow, discharge in first access network with by described The 3GPP communication resources corresponding to the data flow of WLAN transmission, perform from first access network and are switched to second access network, And another part data flow is transmitted by second access network.

For example, a part of data flow is transmitted by the WLAN described, and is switched to second access network, led to Cross during second access network transmits another part data flow, including：

The user equipment is switched to the handover execution stage of second access network performing from first access network When, handoff completion message is sent to the access network equipment of second access network, is included in the handoff completion message described Carrying information corresponding to the data flow of second access network transmission, carrying letter corresponding to the data flow of the WLAN transmission it is not included in Breath；

Or the user equipment is switched to the switching preparation of second access network in execution from first access network During the stage, send switching to the first network equipment and prepare push-notification-answer message, the switching prepares in push-notification-answer message Including will second access network transmit data flow corresponding to carrying information.

For example, if being additionally included in the handoff completion message or the switching preparation push-notification-answer message described Corresponding to the data flow of WLAN transmission during carrying information；

A part of data flow is transmitted by the WLAN described, and is switched to second access network, passes through described the During two access networks transmit another part data flow, in addition to：

The user equipment is being performed after first access network is switched to second access network, release described the The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in two access networks.

The embodiment of the present invention is switched to second from the first access network inside 3GPP communication systems in user equipment execution and connect During networking, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN WLAN, or pass through the WLAN WLAN A part of data flow is transmitted, is switched to second access network, and another part data flow is transmitted by second access network. Can solve to exist in the prior art：, can not be around use when UE switches between the different radio access network in 3GPP networks Existing wlan network resource, the problem of causing the waste of wlan network resource.

Fig. 9 is the structural representation for the network equipment that another embodiment of the present invention provides；It is described positioned at the first access net side The network equipment includes the equipment of the core network and/or access network equipment of first access network, first access network and described Two access networks are wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems, as shown in figure 9, institute Stating the network equipment includes：

Sending module 91, for the handoff preparation phase of the second access network to be switched to from the first access network in user equipment, Switching is sent to the user equipment and prepares notification message, and comprising at least the second access network in the switching preparation notification message believes Breath, so that the user equipment is according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than The priority of second access network, then all data streams are transmitted by the WLAN, or one is transmitted by the WLAN Divided data stream, and second access network is switched to, another part data flow is transmitted by second access network.

For example, if the network equipment be first access network equipment of the core network, sending module 91 to User equipment is sent after switching preparation notification message；The network equipment also includes：

Receiving module 92, prepare push-notification-answer message for receiving the switching that the user equipment is sent；

Determining module 93, indicate no data flow handoff to described for determining that the switching prepares push-notification-answer message Two access networks transmit all data streams by the WLAN；

The sending module 91, it is additionally operable to send to switch to the access network equipment of first access network to prepare unsuccessfully to disappear Breath, to notify the access network equipment of first access network to be switched to cutting for second access network from first access network Change preparation failure.

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

The receiving module 92, it is additionally operable to receive the switching preparation push-notification-answer message that the user equipment is sent, it is described Switching preparation push-notification-answer message includes will be in carrying information corresponding to the data flow that second access network is transmitted；

The sending module 91, the switching for being additionally operable to be received according to the receiving module 91 prepare to wrap in push-notification-answer message What is included will send handover request in carrying information corresponding to the data flow that second access network is transmitted to another network equipment Message, the handover request message include will second access network transmit data flow corresponding to carrying information, no It is included in carrying information corresponding to the data flow of the WLAN transmission, another network equipment includes the access of the second access network Net equipment and/or equipment of the core network.

The embodiment of the present invention is switched to second from the first access network inside 3GPP communication systems in user equipment execution and connect During networking, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN WLAN, or pass through the WLAN WLAN A part of data flow is transmitted, is switched to second access network, and another part data flow is transmitted by second access network. Can solve to exist in the prior art：, can not be around use when UE switches between the different radio access network in 3GPP networks Existing wlan network resource, the problem of causing the waste of wlan network resource.

Figure 10 is the structural representation for the network equipment that another embodiment of the present invention provides；Positioned at the first access net side, institute Stating the network equipment includes the equipment of the core network and/or access network equipment of first access network, first access network and described Second access network is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems, such as Figure 10 institutes Show, the network equipment includes：Processor, memory and communication bus, the processor are connected by communication bus and memory Connect, the instruction for realizing WLAN shunt method is preserved in the memory, further, the network equipment also includes Communication interface, pass through communication interface and other network element devices（Such as user equipment）Communication connection.

When processor transfers the instruction that WLAN shunt method is realized in memory, following steps can be performed：

The handoff preparation phase of the second access network is switched to from the first access network in user equipment, is sent out to the user equipment Switching is sent to prepare notification message, the switching prepares to comprise at least the second access network information in notification message, so that the user Equipment is according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than second access network Priority, then all data streams are transmitted by the WLAN, or a part of data flow is transmitted by the WLAN, and be switched to Second access network, another part data flow is transmitted by second access network.

For example, if the network equipment is the equipment of the core network of first access network, sent out to user equipment After sending switching preparation notification message, including：

Receive the switching that the user equipment is sent and prepare push-notification-answer message；

Indicate no data flow handoff to second access network or logical if it is determined that the switching prepares push-notification-answer message Cross the WLAN transmission all data streams；Then switching is sent to the access network equipment of first access network prepare failed message, To notify the access network equipment of first access network to be switched to from first access network switching of second access network Prepare failure.

For example, after switching is sent to user equipment and prepares notification message, including：

Receive the switching that the user equipment is sent and prepare push-notification-answer message, the switching prepares in push-notification-answer message Including will second access network transmit data flow corresponding to carrying information；

The data that will be transmitted in second access network included according to the switching preparation push-notification-answer message of reception Carrying information corresponding to stream, handover request message is sent to another network equipment, the handover request message includes will be Carrying information corresponding to the data flow of the second access network transmission, it is not included in corresponding to the data flow that the WLAN is transmitted and holds Information carrying ceases, and another network equipment includes the access network equipment and/or equipment of the core network of the second access network.

The embodiment of the present invention is switched to second from the first access network inside 3GPP communication systems in user equipment execution and connect During networking, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN WLAN, or pass through the WLAN WLAN A part of data flow is transmitted, is switched to second access network, and another part data flow is transmitted by second access network. Can solve to exist in the prior art：, can not be around use when UE switches between the different radio access network in 3GPP networks Existing wlan network resource, the problem of causing the waste of wlan network resource.

Figure 11 is the structural representation for the network equipment that another embodiment of the present invention provides；Positioned at the first access net side, institute Stating the network equipment includes the equipment of the core network and/or access network equipment of first access network, first access network and described Second access network is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems, such as Figure 11 institutes Show, including：

Sending module 10, for being switched to the switching preparation failure of the second access network from the first access network in user equipment When, send switching to the user equipment and prepare failed message, the switching prepares to comprise at least described second in failed message Access network information, so that the user equipment is according to the access network discovery and selection strategy, however, it is determined that WLAN priority is high In the priority of second access network, then all data streams are transmitted by the WLAN WLAN.

The embodiment of the present invention is switched to the second access network in user equipment from the first access network inside 3GPP communication systems Switching prepare failure when, user equipment can according to the network equipment send switching prepare failed message, according to access network send out Now with selection strategy, however, it is determined that WLAN WLAN priority be higher than second access network priority, then pass through institute State WLAN WLAN transmission all data streams.Can solve to exist in the prior art：Different nothings of the UE in 3GPP networks When switching between line access, can not existing wlan network resource around use, cause the waste of wlan network resource to be asked Topic.The utilization rate of wlan network resource is improved, ensure that the quality of service of user equipment, improves the Experience Degree of user.

Figure 12 is the structural representation for the network equipment that another embodiment of the present invention provides；Positioned at the first access net side, institute Stating the network equipment includes the equipment of the core network and/or access network equipment of first access network, first access network and described Second access network is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems, such as Figure 12 institutes Show, the network equipment includes：Processor, memory and communication bus, the processor are connected by communication bus and memory Connect, the instruction for realizing WLAN shunt method is preserved in the memory, further, the network equipment also includes Communication interface, pass through communication interface and other network element devices（Such as user equipment）Communication connection.

When processor transfers the instruction that WLAN shunt method is realized in memory, following steps can be performed：

When user equipment is switched to the switching preparation failure of the second access network from the first access network, to the user equipment Send switching and prepare failed message, the switching prepares to comprise at least the second access network information in failed message, so that institute User equipment is stated according to the access network discovery and selection strategy, however, it is determined that WLAN priority is higher than second access network Priority, then all data streams are transmitted by the WLAN WLAN.

The embodiment of the present invention is switched to the second access network in user equipment from the first access network inside 3GPP communication systems Switching prepare failure when, user equipment can according to the network equipment send switching prepare failed message, according to access network send out Now with selection strategy, however, it is determined that WLAN WLAN priority be higher than second access network priority, then pass through institute State WLAN WLAN transmitting data streams.Can solve to exist in the prior art：Different radios of the UE in 3GPP networks connects When switching between networking, can not existing wlan network resource around use, the problem of causing the waste of wlan network resource.Carry The high utilization rate of wlan network resource, ensure that the quality of service of user equipment, improves the Experience Degree of user.

Figure 13 is the structural representation for the WLAN separate system that another embodiment of the present invention provides, such as Figure 13 institutes Show, including：User equipment 31, the network equipment 32, access network discovery and selection functional entity 33；

The user equipment 31 is Fig. 7 or the user equipment described in embodiment illustrated in fig. 8, the related content of user equipment 31 With reference to the associated description in figure 7 or embodiment illustrated in fig. 8, repeat no more；

The network equipment 32 can be the network equipment described in Fig. 9 or embodiment illustrated in fig. 10, or be Figure 11 or figure The network equipment described in 12 illustrated embodiments；Described in associated content reference Fig. 9 or embodiment illustrated in fig. 10 of the network equipment 32 Associated description in the network equipment, or the network equipment with reference to described in figure 11 or embodiment illustrated in fig. 12, is repeated no more.

Wherein, the network equipment 31 includes the access network equipment and/or equipment of the core network of first access network, access Such as including base station, Radio Access Controller, equipment of the core network for example takes net equipment including mobile management entity MME, GPRS Supporting node of being engaged in etc..

The access network discovery and selection functional entity 33, for sending access network discovery and selection to the user equipment Strategy, the access network discovery and selection strategy include wireless access network different inside the 3GPP communication systems with it is described Precedence information between WLAN WLAN, so that the user equipment switches according in execution from first access network To the handoff preparation phase of second access network, according to access network discovery and selection strategy, however, it is determined that the WLAN's is preferential Level is higher than the priority of second access network, then transmits all data streams by the WLAN, or pass by the WLAN Defeated a part of data flow, and second access network is switched to, another part data flow is transmitted by second access network.

Wherein, first access network and second access network are 3G (Third Generation) Moblie partnership projects 3GPP communication systems The internal different wireless access network of system.

The access network discovery and selection functional entity 33, it is additionally operable to send the access network discovery to the user equipment With selection strategy, also include handover event parameter in the access network discovery and selection strategy, so that user equipment 31 is according to cutting Change event argument detection handover event.

The embodiment of the present invention is switched to second from the first access network inside 3GPP communication systems in user equipment execution and connect During networking, according to access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than the described second access The priority of net, then all data streams are transmitted by the WLAN WLAN, or pass through the WLAN WLAN A part of data flow is transmitted, is switched to second access network, and another part data flow is transmitted by second access network. Can solve to exist in the prior art：, can not be around use when UE switches between the different radio access network in 3GPP networks Existing wlan network resource, the problem of causing the waste of wlan network resource.

Figure 14 is the schematic flow sheet for the WLAN shunt method that another embodiment of the present invention provides, such as Figure 14 institutes Show, including：

1401st, user equipment receives the switching preparation failed message that second network equipment is sent, and the switching prepares failure The second access network information is comprised at least in message, to notify the user equipment to be switched to described from first access network The switching of two access networks prepares failure；

1402nd, according to the access network discovery and selection strategy, however, it is determined that WLAN WLAN priority is higher than institute The priority of the second access network is stated, then all data streams are transmitted by the WLAN；

Step 1402 specific implementation may be referred to the related content in embodiment illustrated in fig. 1.

Wherein, second network equipment includes the access network equipment and/or equipment of the core network of first access network, institute It is nothings different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems to state the first access network and second access network Line access.

The embodiment of the present invention is switched to the second access network in user equipment from the first access network inside 3GPP communication systems Switching prepare failure when, user equipment can according to the network equipment send switching prepare failed message, according to access network send out Now with selection strategy, however, it is determined that WLAN WLAN priority be higher than second access network priority, then pass through institute State WLAN WLAN transmitting data streams.Can solve to exist in the prior art：Different radios of the UE in 3GPP networks connects When switching between networking, can not existing wlan network resource around use, the problem of causing the waste of wlan network resource.Carry The high utilization rate of wlan network resource, ensure that the quality of service of user equipment, improves the Experience Degree of user.

Figure 15 is the structural representation for the user equipment that another embodiment of the present invention provides, as shown in figure 15, including：

Receiving module 1501, prepare failed message for receiving the switching that second network equipment is sent, the switching prepares The second access network information is comprised at least in failed message, to notify the user equipment to be switched to institute from first access network The switching for stating the second access network prepares failure；

Determining module 1502, for according to the access network discovery and selection strategy, determining that WLAN WLAN's is excellent First level is higher than the priority of second access network；

Transport module 1503, for transmitting all data streams by the WLAN；

Second network equipment includes the access network equipment and/or equipment of the core network of first access network, and described One access network and second access network, which are that 3G (Third Generation) Moblie partnership projects 3GPP communication systems inside is different, wirelessly to be connect Network.

The embodiment of the present invention is switched to the second access network in user equipment from the first access network inside 3GPP communication systems Switching prepare failure when, user equipment can according to the network equipment send switching prepare failed message, according to access network send out Now with selection strategy, however, it is determined that WLAN WLAN priority be higher than second access network priority, then pass through institute State WLAN WLAN transmitting data streams.Can solve to exist in the prior art：Different radios of the UE in 3GPP networks connects When switching between networking, can not existing wlan network resource around use, the problem of causing the waste of wlan network resource.Carry The high utilization rate of wlan network resource, ensure that the quality of service of user equipment, improves the Experience Degree of user.

In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with Realize by another way.For example, device embodiment described above is only schematical, for example, the unit Division, only a kind of division of logic function, can there is other dividing mode, such as multiple units or component when actually realizing Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or The mutual coupling discussed or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit Close or communicate to connect, can be electrical, mechanical or other forms.

The unit illustrated as separating component can be or may not be physically separate, show as unit The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs 's.

In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also That unit is individually physically present, can also two or more units it is integrated in a unit.Above-mentioned integrated list Member can both be realized in the form of hardware, can also be realized in the form of hardware adds SFU software functional unit.

The above-mentioned integrated unit realized in the form of SFU software functional unit, one can be stored in the form of code and is counted In calculation machine read/write memory medium.Above-mentioned code is stored in a computer-readable recording medium, including some instructions to Processor or hardware circuit is set to perform the part or all of step of each embodiment methods described of the present invention.And foregoing storage is situated between Matter includes：USB without the miniature high power capacity mobile storage disc of phisical drive, mobile hard disk, read-only deposit Reservoir（English：Read-Only Memory, abbreviation ROM）, random access memory（English：Random Access Memory, Abbreviation RAM）, magnetic disc or CD etc. are various can be with the medium of store program codes.

Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic； And these modifications or replacement, the essence of appropriate technical solution is departed from the protection model of various embodiments of the present invention technical scheme Enclose.

Claims (15)

1. A kind of 1. WLAN shunt method, it is characterised in that including：

   User equipment is being switched to the handoff preparation phase of the second access network from the first access network, according to access network discovery and selection Strategy, determine that WLAN WLAN priority is higher than the priority of second access network, first access network and institute It is wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems to state the second access network；

   A part of data flow is transmitted by the WLAN, and is switched to second access network, is passed by second access network Defeated another part data flow；

   Wherein, it is described that a part of data flow is transmitted by the WLAN, and second access network is switched to, pass through described second Access network transmits another part data flow, including：

   If the user equipment is supported simultaneously by second access network and the WLAN transmitting data streams, and the user sets It is standby to determine to be merely able to transmit a part of data flow by the WLAN according to the access network discovery and selection strategy, then：

   While transmitting a part of data flow by the WLAN, perform from first access network and be switched to second access Net, another part data flow is transmitted by second access network；Or

   After transmitting a part of data flow by the WLAN, discharge what is transmitted in first access network and by the WLAN The 3GPP communication resources corresponding to data flow, perform from first access network and be switched to second access network, and by described Second access network transmits another part data flow.
2. 2. according to the method for claim 1, it is characterised in that be switched to second from the first access network in the user equipment Before the handoff preparation phase of access network, in addition to：

   The user equipment switches over event detection according to handover event parameter, and when detecting handover event, prepares to hold Row is switched to second access network from first access network；Or

   The user equipment receives the switching that first network equipment is sent and prepares notification message, and the switching prepares in notification message Including at least the second access network information, to indicate that it is described that the user equipment is ready to carry out being switched to from first access network Second access network, the first network equipment include the equipment of the core network and/or access network equipment of first access network.
3. 3. according to the method for claim 2, it is characterised in that cut in the user equipment according to handover event parameter Change before event detection, in addition to：

   The user equipment receives the access network discovery and selection strategy that access network discovery is sent with selection functional entity, institute Stating access network discovery and selection strategy includes the handover event parameter；Or

   The user equipment receives the measurement configuration parameter that the access network equipment of first access network is sent, the measurement configuration Parameter includes the handover event parameter.
4. 4. according to the method for claim 1, it is characterised in that also include in the access network discovery and selection strategy described Precedence information inside 3GPP communication systems between different wireless access networks and the WLAN WLAN.
5. 5. according to the method for claim 2, it is characterised in that a part of data flow is transmitted by the WLAN described, And second access network is switched to, during transmitting another part data flow by second access network, including：

   The user equipment perform be switched to the handover execution stage of second access network from first access network when, to The access network equipment of second access network sends handoff completion message, and being included in described second in the handoff completion message connects Network carrying information corresponding to the data flow of transmission, is not included in carrying information corresponding to the data flow of the WLAN transmission；Or Person,

   The user equipment perform be switched to the handoff preparation phase of second access network from first access network when, to The first network equipment sends switching and prepares push-notification-answer message, and the switching prepares that push-notification-answer message includes will be Carrying information corresponding to the data flow of the second access network transmission.
6. 6. according to the method for claim 5, it is characterised in that if the handoff completion message or the switching prepare notice When carrying information corresponding to the data flow of the WLAN transmission is additionally included in response message,

   A part of data flow is transmitted by the WLAN described, and is switched to second access network, is connect by described second During the transmission another part data flow that networks, in addition to：

   The user equipment is being performed after first access network is switched to second access network, and release described second connects The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in networking.
7. A kind of 7. user equipment, it is characterised in that including：

   Determining module, for being switched to the handoff preparation phase of the second access network from the first access network, according to access network discovery With selection strategy, determine that WLAN WLAN priority is higher than the priority of second access network, first access Net and second access network are wireless access networks different inside 3G (Third Generation) Moblie partnership projects 3GPP communication systems；

   Transport module, if supporting to transmit data by second access network and the WLAN simultaneously for the user equipment Stream, and determine to be merely able to transmit a part of data flow by the WLAN according to the access network discovery and selection strategy, then：

   While transmitting a part of data flow by the WLAN, perform from first access network and be switched to second access Net, another part data flow is transmitted by second access network；Or

   After transmitting a part of data flow by the WLAN, discharge what is transmitted in first access network and by the WLAN The 3GPP communication resources corresponding to data flow, perform from first access network and be switched to second access network, and by described Second access network transmits another part data flow.
8. 8. user equipment according to claim 7, it is characterised in that the user equipment also includes：

   Detection module, for the determining module from the first access network be switched to the second access network handoff preparation phase it Before, event detection is switched over according to handover event parameter, and when detecting handover event, be ready to carry out connecing from described first Networking is switched to second access network；Or

   First receiving module, for being switched to the handoff preparation phase of the second access network from the first access network in the determining module Before, receive the switching that first network equipment is sent and prepare notification message, the switching prepares to comprise at least the in notification message Two access network information, to indicate that the user equipment is ready to carry out being switched to second access from first access network Net, the first network equipment include the equipment of the core network and/or access network equipment of first access network.
9. 9. user equipment according to claim 8, it is characterised in that the detection module includes：

   First receiving unit, for before event detection is switched over according to handover event parameter, receive access network discovery with The access network discovery and selection strategy that selection functional entity is sent, the access network discovery include described with selection strategy Handover event parameter；Or

   For before event detection is switched over according to handover event parameter, receiving the access network equipment of first access network The measurement configuration parameter of transmission, the measurement configuration parameter include the handover event parameter.
10. 10. user equipment according to claim 7, it is characterised in that the access network discovery in selection strategy with also wrapping Include the precedence information between different wireless access networks and the WLAN WLAN inside the 3GPP.
11. 11. user equipment according to claim 8, it is characterised in that the transport module includes：

    First transmitting element, for performing the handover execution stage that second access network is switched to from first access network When, handoff completion message is sent to the access network equipment of second access network, is included in the handoff completion message described Carrying information corresponding to the data flow of second access network transmission, carrying letter corresponding to the data flow of the WLAN transmission it is not included in Breath；Or

    Second transmitting element, for performing the handoff preparation phase that second access network is switched to from first access network When, send switching to the first network equipment and prepare push-notification-answer message, the switching, which prepares push-notification-answer message, to be included Will be in carrying information corresponding to the data flow that second access network is transmitted.
12. 12. user equipment according to claim 11, it is characterised in that if the handoff completion message or the switching are accurate Carrying information corresponding to the data flow of the WLAN transmission is additionally included in standby push-notification-answer message, is not included in the WLAN and passes Corresponding to defeated data flow during carrying information, the transport module also includes：

    Releasing unit, for performing after first access network is switched to second access network, release described second The 3GPP communication resources corresponding with the data flow transmitted by the WLAN in access network.
13. A kind of 13. WLAN separate system, it is characterised in that including：User equipment, the network equipment, access network discovery with Selection functional entity；

    The user equipment is the user equipment as described in claim any one of 7-12；

    The access network discovery and selection functional entity, for sending access network discovery and selection strategy to the user equipment, The access network discovery and selection strategy include wireless access network different inside the 3GPP communication systems with it is described wireless Precedence information between LAN WLAN, so that the user equipment is being switched to cutting for the second access network from the first access network The preparatory stage is changed, when detecting handover event, according to access network discovery and selection strategy, however, it is determined that the priority of the WLAN is high In the priority of second access network, then a part of data flow is transmitted by the WLAN, and be switched to second access Net, another part data flow is transmitted by second access network, first access network and second access network are the 3rd Different wireless access network inside third-generation mobile communication partnership projects 3GPP.
14. 14. system according to claim 13, it is characterised in that the network equipment includes connecing for first access network Log equipment and/or equipment of the core network.
15. 15. the system according to claim 13 or 14, it is characterised in that the access network discovery in selection strategy with also wrapping Include handover event parameter.