CN103987092B

CN103987092B - The method and apparatus that the network equipment is selected in handoff procedure

Info

Publication number: CN103987092B
Application number: CN201310050277.0A
Authority: CN
Inventors: 段小嫣; 高晨亮; 金辉; 衣强
Original assignee: Huawei Device Dongguan Co Ltd
Current assignee: Huawei Device Co Ltd
Priority date: 2013-02-08
Filing date: 2013-02-08
Publication date: 2018-09-21
Anticipated expiration: 2033-02-08
Also published as: CN103987092A; WO2014121760A1

Abstract

An embodiment of the present invention provides the method and apparatus that the network equipment is selected in a kind of handoff procedure, wherein method includes：It receives the instruction that user equipment is sent and the access net that the session of user equipment uses is accessed into the switching request message that net is switched to the first access net by second；It obtains user equipment and passes through the mark of the first access point name and the first grouped data network gateway corresponding with the first access point name that are used when the second access net core network access；It selects the session that the first Access Point Name is referred to as user equipment to be switched to the access point name used after the first access net, the grouped data network gateway indicated by the mark of the first grouped data network gateway is selected to be switched to the grouped data network gateway used after the first access net as the session of user equipment.Using the present invention, when UE switches between access is netted, IP address can't change, the problem of efficiently avoiding the IP traffic Transmission of UE.

Description

The method and apparatus that the network equipment is selected in handoff procedure

Technical field

The invention belongs to the method and apparatus of the network equipment are selected in the communications field more particularly to handoff procedure.

Background technology

3 G mobile communication network is according to 3GPP（3rd Generation Partnership Project, third Third-generation mobile communication partnership projects）Normal structure is formulated standard realization, be may be simply referred to as mobile communications network or 3GPP networks, is Wide area mobile communications network the most universal is applied at present.And WLAN (Wireless Local Access Network, wirelessly LAN）As a kind of access is convenient, speed is fast, relative low price local communication network is also widely disposed and made With.User can use UE（User Equipment, user equipment）It accesses 3GPP networks or wlan network carries out data service, Such as access internet Internet, download text/audio/video data etc..

UE can also be linked into 3GPP core nets by WLAN, in order to access Internet by 3GPP core nets, from And realize 3GPP networks and the intercommunication of WLAN, be conducive to 3GPP networks to WLAN shunt payload, progress unified charging and QoS （Quality of Service, service quality）Control etc..

Currently, defined in 3GPP standards UE by TWAN (Trusted Wireless Access Network, it is credible Radio Access Network）It is linked into the packet-based core networks EPC of 3GPP evolution（Evolved Packet Core, the packet core of evolution Heart net）Attachment（Register）Flow, wherein TWAN is according to from 3GPP HSS（Home Subscriber Server, ownership label About server）/AAA Server（Authentication, Authorization and Accounting Server, authentication, Authorize accounting server）The subscription data of acquisition is UE selection acquiescences APN（Access Point Name, access point name）. Here, acquiescence APN refers to that label is acquiescence in the corresponding subscription data of UE（default）" APN；When UE is noted to network When grouped data connection is established in volume or request, if UE does not provide APN, network side uses acquiescence APN.For a UE, 1） The acquiescence APN that the acquiescence APN used when UE is accessed by TWAN is used when being accessed by 3GPP from UE may be different, so that PDN GW used in UE when TWAN is accessed（Packet Data Network Gateway, packet data network gateway）It may be with PDN GW used in UE are different when 3GPP is accessed；2）When UE is connect by the acquiescence APN and UE that TWAN accesses use by 3GPP Enter the acquiescence APN used it is identical when, PDN GW used in UE with 3GPP when may also access used in UE when TWAN is accessed PDN GW are different.

Therefore, the network promotion is accessed to non-3GPP access network, when UE passes through non-3GPP access network by believable WLAN After being switched to 3GPP EPC, if the PDN GW and 3GPP used in non-3GPP access network accesses PDN GW used in network Difference, then, IP address used in UE before the handover afterwards will be inconsistent, so as to cause the IP traffic Transmission of the UE.

Invention content

The embodiment of the present invention is designed to provide the method and apparatus that the network equipment is selected in a kind of handoff procedure, it is intended to Solve the problems, such as that UE is switched to IP traffic Transmission when 3GPP accesses network from non-3GPP access network.

On the one hand, an embodiment of the present invention provides a kind of method that the network equipment is selected in handoff procedure, the method packets It includes：

The instruction that user equipment is sent is received to cut the access net that the session of the user equipment uses by the second access net It is changed to the switching request message of the first access net；

The first access point name used when the user equipment accesses net core network access by described second is obtained, from First network equipment obtains the user equipment and is connect with described first by what is used when the second access net core network access The mark of corresponding first grouped data network gateway of access point title, the first network equipment are that network side sets the user The standby network equipment being managed, the management are：It is one or more in signing management, authentication management and location management；

The session that first Access Point Name is referred to as the user equipment is selected to be switched to the first access net The access point name used afterwards selects the grouped data network gateway indicated by the mark of first grouped data network gateway The session as the user equipment is switched to the grouped data network gateway used after the first access net.

With reference to first aspect, in the first possible implementation, described to obtain the user from first network equipment The first packet count corresponding with first access point name that equipment uses when accessing net core network access by described second According to network gateway mark the step of, including：

The first request message is sent to the first network equipment, first request message described in acquisition request for using The mark for the first grouped data network gateway that family equipment uses when accessing net core network access by described second；

Receive the first response message that the first network equipment is sent, at least carried in first response message described in The mark of first grouped data network gateway, the mark of first grouped data network gateway and first access point name It is corresponding.

The possible realization method of with reference to first aspect the first, in second of possible realization method, described first Request message is that position updating request or authentication request or gateway update request, first response message respond for location updating Or Authentication Response or gateway update response, the first network equipment are home subscribed services device or authentication server.

The possible realization method of with reference to first aspect the first, or second of possible realization with reference to first aspect Mode, in the third possible realization method, the method further includes：

The first instruction information is carried in first request message, so that the first network equipment is according at least to institute State the access net that the first instruction information determines that the user equipment uses becomes the first access net from the second access net Later, the step of executing the first response message of the transmission, the preceding session of the first instruction information instruction switching use Access net be described second access net or instruction by access net that the session uses by described second access net be switched to it is described First access net；And/or

The first network equipment is accessed by the radio access technology types of the determination user equipment by described second Net changes into the first access net, determines that access net that the user equipment uses becomes described the from the second access net The step of the first response message of the transmission being executed after one access net.

Either the first of the first possible realization method of first aspect or first aspect with reference to first aspect Either the third of second of possible realization method of first aspect or first aspect are possible for possible realization method Realization method, in the 4th kind of possible realization method, the mark of first grouped data network gateway is specifically by described One network equipment is obtained from second network equipment, and second network equipment is that the user equipment accesses net by described second The authentication server used when core network access.

Either the first of the first possible realization method of first aspect or first aspect with reference to first aspect Either the third of second of possible realization method of first aspect or first aspect are possible for possible realization method 4th kind of possible realization method of realization method or first aspect, in the 5th kind of possible realization method, the selection The session that first Access Point Name is referred to as the user equipment is switched to the access used after the first access net Point title, selects the grouped data network gateway indicated by the mark of first grouped data network gateway as the user The session of equipment is switched to the grouped data network gateway used after the first access net：

According to the second instruction information, first Access Point Name is selected to be referred to as the session switching of the user equipment The access point name used after net is accessed to described first, indicated by the mark for selecting first grouped data network gateway Grouped data network gateway is switched to the packet count used after the first access net as the session of the user equipment According to network gateway, the access net that the session uses before the second instruction information instruction switching accesses net for described second or refers to Show that the access net that the session uses is accessed net by described second is switched to the first access net, the switching request message And/or first response message carries the second instruction information.

Either the first of the first possible realization method of first aspect or first aspect with reference to first aspect Either the third of second of possible realization method of first aspect or first aspect are possible for possible realization method Realization method either the 5th kind of possible realization side of the 4th kind of possible realization method of first aspect or first aspect Formula, in the 6th kind of possible realization method, the acquisition user equipment passes through described second and accesses net core network access When the first access point name for using be specially：

First access point name is obtained from the switching request message, the switching request message carries the use The first access point name that family equipment uses when accessing net core network access by described second；Alternatively,

It obtains when the user equipment accesses net core network access by described second and uses from the first network equipment The first access point name.

The first possible realization side of the possible realization method of with reference to first aspect the first or first aspect Formula either first aspect second of possible realization method either the third possible realization method of first aspect or 4th kind of possible realization method of first aspect or the 5th kind of possible realization method of first aspect, in conjunction with first party The 6th kind of possible realization method in face, in the 7th kind of possible realization method, in the switching request message described in carrying First access point name, so as to first access point name is carried in first request message, and then so that described first The network equipment obtains first Packet Data Network corresponding with first access point name according to first request message The mark that network diagram closes.

Either the first of the first possible realization method of first aspect or first aspect with reference to first aspect Either the third of second of possible realization method of first aspect or first aspect are possible for possible realization method Realization method either the 5th kind of possible realization side of the 4th kind of possible realization method of first aspect or first aspect Formula either the 6th kind of possible realization method of first aspect or the 7th kind of possible realization method of first aspect, In eight kinds of possible realization methods, in the access net that the instruction that the reception user equipment is sent uses session by the second access Net be switched to the step of switching request message of the first access net after, obtain from first network equipment and connect with described first Before the step of mark of corresponding first grouped data network gateway of access point title, the method further includes：

It the second access point name for being contracted in the first access network according to the user equipment and is connect described first The mark of the corresponding second packet data network gateway of second access point name described in networking selects second packet data network Gateway establishes conversation request message to second packet data network gateway transmission；

It receives after the instruction that the second packet data network gateway is sent establishes the message of conversation failure or handover failure, It executes described from first network equipment acquisition first packet data network corresponding with first access point name The step of mark of gateway.

Either the first of the first possible realization method of first aspect or first aspect with reference to first aspect Either the third of second of possible realization method of first aspect or first aspect are possible for possible realization method Realization method either the 5th kind of possible realization side of the 4th kind of possible realization method of first aspect or first aspect Formula either first aspect the 6th kind of possible realization method either the 7th kind of possible realization method of first aspect or 8th kind of possible realization method of first aspect, in the 9th kind of possible realization method, first response message is specific It is sent in the case where there by the first network equipment：

Determine first Access Point Name used when the user equipment accesses net core network access by described second Claim the second access point name used when accessing net core network access by described first from the user equipment different；Or,

Determine the user equipment by first access point name that uses when the second access net core network access with The second access point name that the user equipment uses when accessing net core network access by described first is identical, but described first Grouped data network gateway mark with the user equipment by it is described first access net core network access when use second The mark of grouped data network gateway is different, the mark of the second packet data network gateway and second access point name It is corresponding.

Second aspect, the embodiment of the present invention additionally provide a kind of method that the network equipment is selected in handoff procedure, the side Method includes：

The first request message that the third network equipment is sent is received, first request message is the third network equipment The access net that session uses is switched to cutting for the first access net by the second access net in the instruction for receiving user equipment transmission It changes after request message and sends, first request message passes through the second access net for user equipment described in acquisition request The mark of the first grouped data network gateway used when core network access, the third network equipment are selection Packet Data Network The network equipment that network diagram closes；

The first response message is sent to the third network equipment, described first is at least carried in first response message The mark of grouped data network gateway, so that the third network equipment selects the first Access Point Name to be referred to as the user equipment The session be switched to the access point name that uses after the first access net, and select first Packet Data Network network diagram Grouped data network gateway indicated by the mark of pass is switched to first access as the session of the user equipment The grouped data network gateway used after net, wherein first Access Point Name is known as the user equipment by described second The access point name that uses when accessing net core network access, first access point name is by the third network equipment from described It is obtained in switching request message or first response message, the mark of first grouped data network gateway and described first Access point name is corresponding.

In conjunction with second aspect, in the first possible implementation, first request message is position updating request Or authentication request or gateway update request, first response message are that location updating response or Authentication Response or gateway update are rung It answers, the third network equipment is the network equipment for selecting grouped data network gateway.

In conjunction with the possible realization method of the first of second aspect or second aspect, second of possible realization side In formula, before described the step of sending the first response message to the third network equipment, further include：Determine the user equipment The access net used becomes the first access net from the second access net, specially：

Determine that the access net that the user equipment uses is become from the second access net according at least to the first instruction information The first access net, wherein the access net that the session uses before the first instruction information instruction switching is described second Access net that the session uses is accessed net by described second and is switched to the first access net by access net or instruction, and described the One request message carries the first instruction information；Or,

Net is accessed by described second change into described first by the radio access technology types of the determination user equipment Net is accessed, determines that the access net that the user equipment uses becomes the first access net from the second access net.

In conjunction with second of second aspect either the first possible realization method of second aspect or second aspect Possible realization method, in the third possible realization method, carried in first response message it is described first grouping The mark of data network gateway is specifically obtained from second network equipment, wherein second network equipment is the user equipment The authentication server used when accessing net core network access by described second.

In conjunction with second of second aspect either the first possible realization method of second aspect or second aspect The possible realization method of the third of possible realization method or second aspect, in the 4th kind of possible realization method, institute It states and at least carries the mark of first grouped data network gateway in the first response message and include：In first response message Carry the mark of first access point name and first grouped data network gateway.

In conjunction with second of second aspect either the first possible realization method of second aspect or second aspect The 4th kind of possible realization method either the third possible realization method of second aspect or second aspect is possible Realization method, in the 5th kind of possible realization method, the method further includes：Described in being carried in the switching request message First access point name is asked so as to carry first access point name in first request message according to described first First access point name carried in message, at least carries first Packet Data Network in first response message The mark that network diagram closes, the mark of first grouped data network gateway are corresponding with first access point name.

In conjunction with second of second aspect either the first possible realization method of second aspect or second aspect The 4th kind of possible realization method either the third possible realization method of second aspect or second aspect is possible 5th kind of possible realization method of realization method or second aspect, in the 6th kind of possible realization method, described to institute Before stating the step of third network equipment sends the first response message, the method further includes：

The third aspect, the embodiment of the present invention additionally provide the device that the network equipment is selected in a kind of handoff procedure, the dress Set including：

Switching request message reception units, the instruction for receiving user equipment transmission make the session of the user equipment Access net is switched to the switching request message of the first access net by the second access net；

First acquisition unit is used for obtaining when the user equipment accesses net core network access by described second First access point name；

Second acquisition unit passes through the second access net access for obtaining the user equipment from first network equipment The mark of the first grouped data network gateway corresponding with first access point name used when core net, first net Network equipment is the network equipment that network side is managed the user equipment, and the management is：Signing management, authentication management and It is one or more in location management；

Selecting unit, for selecting the first Access Point Name that the acquiring unit obtains to be referred to as the institute of the user equipment It states session and is switched to the access point name used after the first access net, the first packet count for selecting the acquiring unit to obtain Grouped data network gateway indicated by mark according to network gateway is switched to described as the session of the user equipment The grouped data network gateway used after first access net.

In conjunction with the third aspect, in the first possible implementation, the second acquisition unit, including：

First request message transmission sub-unit, for sending the first request message to the first network equipment, described the Used when accessing net core network access by described second for user equipment described in acquisition request first point of one request message The mark of group data network gateway；

First response message receiving subelement disappears for sending the first request in the first request message transmission sub-unit After breath, receive the first response message that the first network equipment is sent, at least carried in first response message described in The mark of first grouped data network gateway, the mark of first grouped data network gateway and first access point name It is corresponding.

In conjunction with the first possible realization method of the third aspect, in second of possible realization method, described first Request message is that position updating request or authentication request or gateway update request, first response message respond for location updating Or Authentication Response or gateway update response, the first network equipment are home subscribed services device or authentication server.

In conjunction with the first possible realization method of the third aspect or second of possible realization side of the third aspect Formula carries the first instruction information, so that first net in the third possible realization method, in first request message Network equipment determines that the access net that the user equipment uses is become by the second access net according at least to the first instruction information The step of the first response message of the transmission being executed for the first access net later, before the first instruction information instruction switching The access net that the session uses is that the second access net or instruction connect the access net that the session uses by described second Networking is switched to the first access net.

In conjunction with second of the third aspect either the first possible realization method of the third aspect or the third aspect The possible realization method of the third of possible realization method or the third aspect, in the 4th kind of possible realization method, institute The mark of the first grouped data network gateway of second acquisition unit acquisition is stated specifically by the first network equipment from the second net Network equipment obtains, and second network equipment user equipment uses when accessing net core network access by described second Authentication server.

In conjunction with second of the third aspect either the first possible realization method of the third aspect or the third aspect The 4th kind of possible realization method either the third possible realization method of the third aspect or the third aspect is possible Realization method, in the 5th kind of possible realization method, the selecting unit is specifically used for,

According to the second instruction information, first Access Point Name is selected to be referred to as the session switching of the user equipment The access point name used after net is accessed to described first, indicated by the mark for selecting first grouped data network gateway Grouped data network gateway is switched to the packet count used after the first access net as the session of the user equipment According to network gateway, wherein the access net that the session uses before the second instruction information instruction switching accesses for described second The access net that the session uses is accessed net by described second and is switched to the first access net by net or instruction, and the switching is asked Message and/or first response message is asked to carry the second instruction information.

In conjunction with second of the third aspect either the first possible realization method of the third aspect or the third aspect The 4th kind of possible realization method either the third possible realization method of the third aspect or the third aspect is possible 5th kind of possible realization method of realization method or the third aspect, in the 6th kind of possible realization method, described first Acquiring unit is specifically used for obtaining first access point name from the switching request message, and the switching request message is taken The first access point name used when accessing net core network access by described second with the user equipment；Alternatively,

Pass through the second access net access core specifically for obtaining the user equipment from the first network equipment The first access point name used when net.

In conjunction with second of the third aspect either the first possible realization method of the third aspect or the third aspect The 4th kind of possible realization method either the third possible realization method of the third aspect or the third aspect is possible Realization method either the 6th kind of possible realization side of the 5th kind of possible realization method of the third aspect or the third aspect Formula carries first access point name, so that described in the 7th kind of possible realization method in the switching request message First access point name is carried in first request message, and then so that the first network equipment is asked according to described first Message obtains the mark of first grouped data network gateway corresponding with first access point name.

In conjunction with second of the third aspect either the first possible realization method of the third aspect or the third aspect The 4th kind of possible realization method either the third possible realization method of the third aspect or the third aspect is possible Realization method either the 6th kind of possible realization side of the 5th kind of possible realization method of the third aspect or the third aspect It is single in the reception in the 8th kind of possible realization method in 7th kind of possible realization method of formula or the third aspect Before member receives, described device further includes：

Conversation request message transmission unit is established, for receiving the switching in the switching request message reception units After request message, before the mark that the second acquisition unit obtains first grouped data network gateway, according to institute State the second access point name that user equipment is contracted in the first access network and in the first access network described second The mark of the corresponding second packet data network gateway of access point name selects second packet data network gateway, to described second Conversation request message is established in grouped data network gateway transmission；

Execution unit establishes conversation failure or switching for receiving the instruction that the second packet data network gateway is sent After failure news, the second acquisition unit is notified to obtain the user equipment from first network equipment and connect by described second The mark of the first grouped data network gateway corresponding with first access point name used when networking core network access.

Fourth aspect, the embodiment of the present invention additionally provide the device that the network equipment is selected in a kind of handoff procedure, the dress Set including：

First request message receiving unit, the first request message for receiving the transmission of the third network equipment, described first Request message is that the third network equipment is receiving the instruction access net that uses session of user equipment transmission by second Access net, which is switched to, to be sent after the switching request message of the first access net, and first request message is for described in acquisition request The mark of the first grouped data network gateway that user equipment uses when accessing net core network access by described second, described the Three network equipments are the network equipment for selecting grouped data network gateway；

First response message transmission unit, for the third network equipment send the first response message, described first The mark of first grouped data network gateway is at least carried in response message, so that third network equipment selection first The session that Access Point Name is referred to as the user equipment is switched to the access point name used after the first access net, and Select the grouped data network gateway indicated by the mark of first grouped data network gateway as the user equipment The session is switched to the grouped data network gateway used after the first access net, wherein first access point name The access point name used when accessing net core network access by described second for the user equipment, first Access Point Name Title is obtained by the third network equipment from the switching request message or first response message, first packet count It is corresponding with first access point name according to the mark of network gateway.

In conjunction with fourth aspect, in the first possible implementation, first request message is position updating request Or authentication request or gateway update request, first response message are that location updating response or Authentication Response or gateway update are rung It answers, the third network equipment is the network equipment for selecting grouped data network gateway.

In conjunction in the possible realization method of the first of fourth aspect or fourth aspect, in second of possible realization In mode, described device further includes：

Determination unit, for before the first response message transmission unit sends first response message, determining The access net that the user equipment uses becomes the first access net from the second access net.

In conjunction with second of possible realization method of fourth aspect, in the third possible realization method, the determination Unit is specifically used for：

Before the first response message transmission unit sends first response message, believe according at least to the first instruction Breath determines that the access net that the user equipment uses becomes the first access net from the second access net, wherein described the The access net that the session uses before one instruction information instruction switching accesses net for described second or instruction uses the session Access net access net by described second and be switched to the first access net, first request message carries first instruction Information；Or,

Before the first response message transmission unit sends first response message, by determination, the user sets Standby radio access technology types access net by described second and change into the first access net, determine that the user equipment uses Access net from it is described second access net become it is described first access net.

In conjunction in fourth aspect either the first possible realization method of fourth aspect or second of fourth aspect Possible realization method or fourth aspect the third possible realization method, it is described in the 4th kind of possible realization method The mark of first grouped data network gateway carried in first response message is specifically obtained from second network equipment, In, second network equipment is the authentication service used when the user equipment accesses net core network access by described second Device.

In conjunction in fourth aspect either the first possible realization method of fourth aspect or second of fourth aspect The 4th kind of possible realization method either the third possible realization method of fourth aspect or fourth aspect is possible Realization method at least carries first grouped data in the 5th kind of possible realization method in first response message The mark of network gateway includes：First access point name and first grouped data are carried in first response message The mark of network gateway.

In conjunction in fourth aspect either the first possible realization method of fourth aspect or second of fourth aspect The 4th kind of possible realization method either the third possible realization method of fourth aspect or fourth aspect is possible 5th kind of possible realization method of realization method or fourth aspect, in the 6th kind of possible realization method, the switching First access point name is carried in request message, so as to carry first Access Point Name in first request message Claim, according to first access point name carried in first request message, is at least taken in first response message Mark with first grouped data network gateway, the mark of first grouped data network gateway are accessed with described first Point title is corresponding.

In conjunction in fourth aspect either the first possible realization method of fourth aspect or second of fourth aspect The 4th kind of possible realization method either the third possible realization method of fourth aspect or fourth aspect is possible Realization method either the 6th kind of possible realization side of the 5th kind of possible realization method of fourth aspect or fourth aspect Formula, in the 7th kind of possible realization method, described device further includes determination unit, is specifically used for：

Before the first response message transmission unit sends first response message, determine that the user equipment is logical First access point name that uses and the user equipment pass through described the when crossing the second access net core network access The second access point name used when one access net core network access is different；Alternatively,

Before the first response message transmission unit sends first response message, determine that the user equipment is logical First access point name used when the second access net core network access is crossed to connect by described first with the user equipment The second access point name used when networking core network access is identical, but the mark of first grouped data network gateway and institute The mark for stating the second packet data network gateway used when user equipment accesses net core network access by described first is different, The mark of the second packet data network gateway is corresponding with second access point name.

In the embodiment of the present invention, when UE switches between access is netted, not by the side for distributing new APN and PDN GW Formula establishes connections of the UE to new access net, but obtained by new an acquisitions flow used when the former access of access is netted as The network equipments such as PDN GW, so that after UE is switched to another access net, IP address can't change, and avoid UE's The problem of IP traffic Transmission.

Description of the drawings

Fig. 1 be the embodiment of the present invention a kind of handoff procedure in selection the network equipment method flow diagram；

Fig. 2 is the flow of the one of which specific method of the mark of the acquisition grouped data network gateway of the embodiment of the present invention Schematic diagram；

Fig. 3 be the embodiment of the present invention another handoff procedure in selection the network equipment method flow diagram；

Fig. 4 be the embodiment of the present invention another handoff procedure in selection the network equipment method flow diagram；

Fig. 5 be the embodiment of the present invention handoff procedure in selection the network equipment method one of which detailed process signal Figure；

Fig. 6 be the embodiment of the present invention handoff procedure in the wherein another detailed process of method of the selection network equipment show It is intended to；

Fig. 7 be the embodiment of the present invention handoff procedure in wherein another detailed process of method of the selection network equipment show It is intended to；

Fig. 8 be the embodiment of the present invention handoff procedure in wherein another detailed process of method of the selection network equipment show It is intended to；

Fig. 9 be the embodiment of the present invention a kind of handoff procedure in selection the network equipment device structure composition schematic diagram；

Figure 10 is the one of which concrete structure schematic diagram of the second acquisition unit in Fig. 9；

Figure 11 be the embodiment of the present invention another handoff procedure in selection the network equipment device structure composition signal Figure；

Figure 12 be the embodiment of the present invention another handoff procedure in selection the network equipment device structure composition signal Figure；

Figure 13 is a kind of structure composition schematic diagram of network equipment provided in an embodiment of the present invention；

Figure 14 is the structure composition schematic diagram of another network equipment provided in an embodiment of the present invention.

Specific implementation mode

In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.

Fig. 1 is referred to, the flow signal of the method for the network equipment is selected in a kind of handoff procedure for being the embodiment of the present invention It is right when figure, the method for the embodiment of the present invention can be applied to user equipment (UE) and carry out access between different accesses net and switch The selection for including the network equipments such as grouped data network gateway PDN GW, specifically can be for example, by MME（Mobility Management Entity, mobile management entity）It is executed Deng the equipment with network equipment selection function, specifically, of the invention Embodiment the method includes：

S101：The access net that the instruction that user equipment is sent uses the session of the user equipment is received to be accessed by second Net is switched to the switching request message of the first access net；

User equipment (UE) can be receive user network switching instruction when, or detecting covering signal be better than When the second access net of the first access net, generates and sends and described indicate the access net that uses the session of the UE by the Two access nets are switched to the switching request message of the first access net, which carries out network particularly for request and cut The message changed, for example, if when UE needs to switch to 3GPP access nets from non-3 GPP access network, switching request message can be UE The Attach Request message sent to corresponding MME（attach request）.

S102：Obtain the first Access Point Name used when the user equipment accesses net core network access by described second Claim, obtained from first network equipment used when the user equipment accesses net core network access by described second with described the The mark of corresponding first grouped data network gateway of one access point name.

The first network equipment is the network equipment that network side is managed the user equipment, such as ownership signing Server HSS or authentication server etc., the management are：Signing management, authentication management and one kind or more in location management Kind.When UE is by the second access net core network access, first network equipment obtains and the storage management UE is used APN and right The PDN GW answered.

Optionally, first access point name i.e. the first APN can be obtained directly from the switching request message, i.e., UE can be carried when the user equipment accesses net core network access by described second in the switching request message and be used The first APN；That is, the first access point name can the user equipment directly report.Or：Can also from institute The first APN for obtaining in first network equipment and being used when the user equipment accesses net core network access by described second is stated, Can be according to the information such as the mark of user equipment (UE) to as in the first networks equipment such as HSS request search after obtain.

And the first grouped data network gateway i.e. mark of the first PDN GW, then it can be determined the UE After one APN, according to the mark for getting corresponding first PDN GW in the first APN to first network equipment.Certainly, at it In his embodiment, it can also be obtained from the first networks equipment such as such as HSS according to the mark of user equipment (UE).First PDN The mark of GW can be the first addresses PDN GW or PDN GW FQDN（Fully Qualified Domain Name, full name Domain name）Deng.

S103：The session that first Access Point Name is referred to as the user equipment is selected to be switched to described first and connect The access point name used after networking selects the packet data network indicated by the mark of first grouped data network gateway Gateway is switched to the grouped data network gateway used after the first access net as the session of the user equipment.

UE continues through APN the and PDN GW used in the second access net and is linked into the first access net, is connect to realize Enter into core net and carries out the operations such as Various types of data access, interaction.

Specifically, the S103 can specifically include：According to the second instruction information, first Access Point Name is selected to be referred to as It is switched to the access point name used after the first access net for the session of the user equipment, selects described first point Grouped data network gateway indicated by the mark of group data network gateway is switched to as the session of the user equipment The grouped data network gateway used after the first access net, the second instruction information indicate that the session uses before switching Access net access net that the session uses is accessed into net by described second and is switched to institute for the second access net or instruction The first access net is stated, the switching request message and/or first response message carry the second instruction information.

The mark of the first APN and the first PDN GW used when getting the access net of UE access first and being linked into core net Afterwards, according in switching request message the second instruction information or returned according to the first request message by first network equipment the The the second instruction information carried in one response message, initiates session establishment flow.

In the embodiment of the present invention, when UE switches between access is netted, flow realization through the embodiment of the present invention is switching In the process by the network equipment used when former access net core network access before selection switching, specifically, being selected in handoff procedure The preceding grouped data network gateway by being used when former access net core network access of switching is selected, so that UE is switched to another connect After networking, IP address can't change, the problem of avoiding the IP traffic Transmission of UE.

Fig. 2 is referred to again, is that the one of which of the mark of the acquisition grouped data network gateway of the embodiment of the present invention is specific The acquisition methods of the flow diagram of method, the mark of the grouped data network gateway of the embodiment of the present invention include：

S1001：The first request message is sent to the first network equipment, first request message is used for acquisition request The mark for the first grouped data network gateway that the user equipment uses when accessing net core network access by described second；

S1002：The first response message that the first network equipment is sent is received, is at least taken in first response message Mark with first grouped data network gateway, the mark of first grouped data network gateway are accessed with described first Point title is corresponding.

May include that the mark of the UE and/or user information and/or UE access second access in first request message First APN used in net（What UE was directly reported）Deng in order to which the first networks such as HSS equipment can be in the PDN being locally stored In GW marks, the mark of used PDN GW when the UE access second access net is searched, and returns to the PDN GW marks found Know the mark of i.e. the first PDN GW.UE can carry first access point name in the switching request message, so that institute State and carry first access point name in the first request message, and then so that the first network equipment such as HSS according to First request message obtains the mark of first grouped data network gateway corresponding with first access point name.

Certainly, the mark of first grouped data network gateway specifically can also be by the first network equipment from second The network equipment obtains, and second network equipment is that the user equipment uses when accessing net core network access by described second Authentication server.I.e.：The first networks such as HSS equipment can also be when receiving first request message, according to corresponding The mark of UE is to such as AAA Server etc. for being authenticated, being authorized and second network equipment of charging goes to obtain the UE access PDN GW marks used in second access net, in order to which first network equipment can be corresponding according to the return of the first request message The mark of first PDN GW.

Specifically, first request message can be position updating request or authentication request or gateway update request, institute It can be that location updating response or Authentication Response or gateway update are rung that the first response message, which is stated, corresponding to first request message It answers, the first network equipment can be home subscribed services device or authentication server.

Further, first network equipment, first can be with before returning to the first response message according to the first request message It determines whether the access net that UE is used switches according to the first request message, if occurring, obtains the mark of the first PDN GW, And the first response message of the mark at least carrying the first PDN GW is returned, it can specifically be realized by following steps：

Specifically, the first request message can be position updating request or authentication request or gateway update request, first asks The first instruction information can be carried by asking in message, before instruction switching the access net that uses of the session be described second access net or Indicate that the access net that the session uses is accessed net by described second is switched to the first access net；The first network is set Standby the first instruction information after receiving the first request message, carried in the first request message of foundation, and/or according to the first net The radio access technology types of the user equipment of network equipment storage, determine the radio access technology types of the user equipment Net, which is accessed, by described second changes into the first access net.

Still optionally further, first response message is specifically sent by first equipment in the case where there：

It is understood that the method for the mark of acquisition grouped data network gateway in the embodiment of the present invention specifically can be with The user equipment is obtained corresponding to the slave first network equipment in the S102 described in above-mentioned Fig. 1 to connect by the second access net Enter the identification of steps of the first grouped data network gateway corresponding with first access point name used when core net.

By the description of above-described embodiment it is found that the present invention has the following advantages：

The switching flow disclosed through the embodiment of the present invention, it can be ensured that UE is continuing with after being switched to new access net Used PDN GW avoid to which IP address will not change when accessing net core network access by original before its switching The problem of IP traffic Transmission of UE.

Fig. 3 is referred to again, and the flow of the method for the network equipment is selected in another handoff procedure for being the embodiment of the present invention The method of schematic diagram, the present embodiment specifically includes：

S201：The access net that the instruction that user equipment is sent uses the session of the user equipment is received to be accessed by second Net is switched to the switching request message of the first access net.

S202：The second access point name for being contracted in the first access network according to the user equipment and described The mark of the corresponding second packet data network gateway of second access point name described in one access net selects second packet data Network gateway establishes conversation request message to second packet data network gateway transmission.

I.e. when receiving switching request message, that first attempts directly to obtain the user equipment by subscription data second connects Access point title, and directly obtain the corresponding second packet data network gateway of the second access point name.At this point, if obtain The first access point name when two access point name and user equipment are linked into core net by the second access net is identical, then may Also first PDN GW corresponding with the first APN is identical for the mark of obtained the 2nd PDN GW of correspondence, can also initiate to establish at this time Session request is to establish session and ensure that IP transmission is not interrupted.

If because the first APN and the 2nd APN is differed when the first PDN GW and the 2nd PDN GW being caused to differ；Or Although the first APN and the 2nd ANP are identical, when the first PDN GW and the 2nd PDN GW are still differed, built initiating session After vertical request, the switching instruction in corresponding 2nd PDN GW None- identified switching request message causes session establishment to fail, that Following S203 can be executed.

S203：It receives the instruction that the second packet data network gateway is sent and establishes disappearing for conversation failure or handover failure Breath.When receiving instruction and establishing the message of conversation failure or handover failure, needs to execute following S204 and connect with initiating to obtain UE Enter used first APN and the first PDN GW when the second access net.

S204：Obtain the first Access Point Name used when the user equipment accesses net core network access by described second Claim, obtained from first network equipment used when the user equipment accesses net core network access by described second with described the The mark of corresponding first grouped data network gateway of one access point name, the first network equipment are network side to the use The network equipment that family equipment is managed, the management are：Signing management, authentication management and one kind or more in location management Kind.

S205：The session that first Access Point Name is referred to as the user equipment is selected to be switched to described first and connect The access point name used after networking selects the packet data network indicated by the mark of first grouped data network gateway Gateway is switched to the grouped data network gateway used after the first access net as the session of the user equipment.

It should be noted that compared with the corresponding embodiments of above-mentioned Fig. 1, the embodiment of the present invention is set in the reception user The access net that session uses is switched to the switching request message that first access is netted by the instruction that preparation is sent by the second access net The step of after, from first network equipment obtain corresponding with first access point name the first grouped data network gateway Before the step of mark, the step of having newly increased above-mentioned S202 and S203, the S201 and above-mentioned S101 implementation procedure phases Together, the S204 and S205 then corresponds to above-mentioned S102 and S103, and this will not be repeated here for specific implementation process.

Fig. 4 is referred to again, and the flow of the method for the network equipment is selected in another handoff procedure for being the embodiment of the present invention Schematic diagram, when the method for the embodiment of the present invention carries out accessing switching applied to user equipment (UE) between different accesses net, To including the selection of the network equipments such as grouped data network gateway PDN GW, can specifically have to described for example, by HSS etc. User equipment carry out include signing management, authentication management and one or more management in location management equipment execute, this hair Bright embodiment the method includes：

S301：The first request message that the third network equipment is sent is received, first request message is the third net The access net that session uses is switched to the first access by network equipment in the instruction for receiving user equipment transmission by the second access net It is sent after the switching request message of net, first request message passes through described second for user equipment described in acquisition request The mark of the first grouped data network gateway used when net core network access is accessed, the third network equipment is that selection is grouped The network equipment of data network gateway.

Specifically, the third network equipment can be the network equipments such as MME.User equipment (UE) can receive use When the network switching instruction at family, or when detecting that covering signal is better than the second access net of the first access net, generate And it sends corresponding instruction and the access net that the session of the user equipment uses is switched to the first access net by the second access net Switching request message, the switching request message be specifically used for request carry out network switching message, for example, if UE need from When non-3 GPP access network switches to 3GPP access nets, UE sends Attach Request message to corresponding MME（attach request）.

First request message is position updating request or authentication request or gateway update request, and first response disappears It can be location updating response or Authentication Response or gateway update response, first net that breath, which corresponds to first request message, Network equipment is home subscribed services device or authentication server.

S302：The first response message is sent to the third network equipment, institute is at least carried in first response message The mark of the first grouped data network gateway is stated, so that the third network equipment selects the first Access Point Name to be referred to as the use The session of family equipment is switched to the access point name used after the first access net, and selects first grouped data Grouped data network gateway indicated by the mark of network gateway is switched to described as the session of the user equipment The grouped data network gateway used after one access net, wherein first Access Point Name is known as the user equipment and passes through institute The access point name used when the second access net core network access is stated, first access point name is by the third network equipment It is obtained from the switching request message or first response message, the mark of first grouped data network gateway and institute It is corresponding to state the first access point name.

The mark of the first grouped data network gateway in first response message can be mark according to UE, user First APN used in information or the access net of UE access second（What UE was directly reported）Etc. information, in the PDN being locally stored In GW marks, the mark of used PDN GW when the UE access second access net is searched, and carries and disappears in first response The third network equipment is returned in breath.

Certainly, the mark of first grouped data network gateway carried in first response message specifically can also It is obtained from second network equipment, wherein second network equipment is that the user equipment passes through the second access net access The authentication server used when core net.I.e.：The first networks such as HSS equipment can also receive first request message When, such as AAA Server are identified to for being authenticated, being authorized and second network equipment of charging according to corresponding UE PDN GW marks used in the middle acquisition UE access first access net, in order to which first network equipment can be according to the first request Message returns to the mark of corresponding PDN GW.

First network equipment according to the first request message return the first response message before, further include：Determine the use The access net that family equipment uses becomes the first access net from the second access net, specially：

After determining that access net that user equipment uses becomes the first access net from the second access net, that is, obtain Corresponding first grouped data network gateway, or the further information such as the first APN that obtain again disappear in order to be responded first Breath carries the first PND GW and the first APN and returns to the third network equipment.

Further, the specific acquisition modes of acquisition the first PND GW and the first APN can be：Disappear in the switching request First access point name is carried in breath, so as to first access point name is carried in first request message, according to First access point name carried in first request message at least carries described in first response message The mark of one grouped data network gateway, the mark of first grouped data network gateway and the first access point name phase It is corresponding.

The method that the network equipment is selected in the handoff procedure of the embodiment of the present invention is introduced with 4 specific examples below.

Fig. 5 is referred to, selects the one of which of the method for the network equipment specific in the handoff procedure for being the embodiment of the present invention Flow diagram.The method of the embodiment of the present invention is applied to UE and is switched to 3GPP access nets from the TWAN of non-3 gpp, wherein MME be the third network equipment, and HSS then be first network equipment, TWAN be second access net, 3GPP access net E- UTRAN is the first access net.The method specifically includes：

S1：UE is connected to believable Radio Access Network TWAN.UE can be by serving the PDN GW and TWAN of the UE Between S2a interfaces establish PMIPv6（Proxy Mobile IPv6, proxy mobile IPv 6 agreement）Or GTP（GPRS Tunnel Protocol, general packet wireless service tunnel protocol）Tunnel, realizes the connection of UE and TWAN, and passes through corresponding IP address Session is established, to carry out data access in core net or by core net.

S2：UE detects E-UTRAN（Evolved Universal Terrestrial Radio Access Network, the Universal Terrestrial Radio Access Network network of evolution）, determine current sessions being switched to E-UTRAN by TWAN.Specifically may be used To be that user in advance sets preferentially by E-UTRAN core network access the UE to, therefore, when UE detects that E-UTRAN is corresponded to Covering signal when, that is, initiate the flow that current sessions TWAN is switched to E-UTRAN.Can certainly be that UE is detected currently E-UTRAN signal covering it is preferable when, initiate for current sessions TWAN to be switched to the flow of E-UTRAN.

S3：UE initiates attach request Attach Request to MME, wherein switching instruction Handover can be carried Indication, to indicate that the access net that the session of the user equipment uses is switched to first by the second access net TWAN to be connect Networking E-UTRAN.

It is described to receive the switching request message that user equipment is sent and be specifically as follows the UE of the embodiment of the present invention to MME The attach request of transmission, it is of course also possible to for others be used to indicate the access net that uses the session of the user equipment by Second access net such as TWAN is switched to the request of the first access net such as E-UTRAN.

S4：MME to HSS send signaling UE is authenticated, that is, include determine the UE whether be contracted user authentication behaviour Make, and executes following S5 after the authentication is passed.

S5：MME sends more new position request Update Location Request to HSS.The request message includes UE The RAT of present access network（Radio Access Technology, wireless access technology）Type, MME marks etc., with update The location information of UE.At this point, the radio access technology types RAT of present access network is E-UTRAN.The more new position request It is additionally operable to the corresponding subscription data of request UE, specifically includes the information such as the corresponding PDN GW marks of APN and APN of signing.

First request message sent to the first network equipment is specifically as follows the MME in the embodiment of the present invention To more new position request described in HSS transmissions, naturally it is also possible to be used for UE described in HSS acquisition requests described in be other The message of the mark of the first PDN GW used when the second access net core network access, such as authentication request or more new gateway is asked It asks.

The first instruction information carried in first request message is specifically as follows the more new position request The RAT types of the UE present access networks carried in message.

S6：HSS is E- according to the RAT in access network information, and more new position request before the switching for the UE being locally stored UTRAN determines that the access net of UE changes into E-UTRAN by TWAN, and can be with further, it is determined that UE is made by TWAN accesses APN is different from the APN that E-UTRAN is accessed.Specifically, UE by the APN that uses of WLAN accesses can be acquiescence APN or its Its APN (i.e. non-default APN).Specifically, when access network information is including at least UE access TWAN before the switching of the UE of HSS storages RAT types, i.e. RAT=WLAN or RAT=TWAN；UE can be acquiescence APN by the APN that TWAN accesses use.

S7：HSS replys update location confirmation message Update Location ACK to MME, may include UE logical in message The corresponding UE of access point name APN, APN used when TWAN core network access is crossed by using when TWAN core network access Access network information and other information before the mark of PDN GW, switching.Specifically, the UE that message includes accesses network by TWAN The access point name APN used can be one or more, wherein at least include the acquiescence that UE accesses Web vector graphic by TWAN APN；To which message includes the mark of the corresponding PDN GW of each APN.PDN GW marks can be the addresses PDN GW or PDN GW FQDN are illustrated with the addresses PDN GW that are identified as of the PDN GW in the present embodiment；Specifically, the addresses PDN GW can To be the IP address of PDN GW.Access network information can specifically include the information such as previous radio access technology types before switching, this In previous radio access technology types be WLAN or TWAN, may be used Previous RAT=WLAN or Previous RAT= TWAN is indicated.

The first response message that the first network equipment of the reception is sent is specifically as follows in the embodiment of the present invention The update location confirmation message that sends of the HSS, naturally it is also possible to for other response messages for responding the requests of S5, UE can be wherein carried to access by TWAN by the corresponding UE of access point name APN, APN used when TWAN core network access The information such as the mark of the PDN GW used when core net.

The second instruction information that first response message carries is specifically as follows to be carried in first response message Access network information before switching.

S8：Since UE does not provide APN in attach request, MME is according to access net before switching in update location confirmation message Information, such as previous radio access technology types are the information of TWAN, and selection updates UE in location confirmation message and accessed in TWAN Indicated by marks of the acquiescence APN and its corresponding UE of Web vector graphic by the PDN GW used when TWAN core network access PDN GW are switched to APN the and PDN GW used after the E-UTRAN as UE current sessions.

Following S9 to S21 is after MME obtains the first APN and its corresponding first PDN GW marks, and the session of initiation is built Vertical flow.

S9：MME is to S-GW（Serving Gateway, gateway）Session request Create Session are established in transmission Request, the request message include the address of the APN selected in step S8 and corresponding PDN GW, switching instruction, and its Its information.

S10：S-GW establishes session request according to the addresses PDN GW in step S9, to the PDN GW transmissions, and message includes Switching instruction and other information.

S11：If using PCC in network（Policy and Charging Control, dynamic strategy and charging control System）, then according to switching instruction, PDN GW are to PCRF（Policy and Charging Rules Function, policy, billing rule Then functional entity）Initiate IP-CAN（Internet Protocol-Connectivity Access Network, IP connections connect Enter network）Session modification process, to obtain the QoS policy that UE is switched to session after new access network E-UTRAN With charging regulation.

S12：PDN GW establish conversational response Create Session Response to S-GW transmissions.Foundation establishes session Switching instruction in request, PDN GW are that UE distribution is identical as before switching（Web vector graphic is accessed in TWAN）IP address （Including the addresses IPv4 or IPv6 prefixes）, and carry in establishing conversational response message.

S13：S-GW establishes conversational response to MME transmissions, wherein carrying the IP address of UE.

S14：UE establishes radio access bearer by E-UTRAN.

S15：MME sends modification carrying request Modify Bearer Request to S-GW, wherein carrying switching instruction.

S16：According to switching instruction, S-GW sends modification carrying request to PDN GW, make PDN GW by grouped data by TWAN access systems go to E-UTRAN, and immediately begin to send grouped data to S-GW.

S17：PDN GW send modification carrying response Modify Bearer Response to S-GW.

S18：S-GW sends modification carrying response to MME.

S19：UE begins through E-UTRAN and sends and receives data.

S20：If there are multiple PDN connections, UE, and other PDN connections to be then switched to E- by TWAN accesses one by one by UE UTRAN。

S21：PDN GW access net to TWAN and initiate resource release process, and corresponding bearing resource is accessed to discharge TWAN.

The embodiment of the present invention discloses the flow that a complete UE is switched to the first access net from the second access net, realizes Access network switching is front and back to select the same PDN GW for UE, to ensure that UE can use identical IP address into guild The case where talking about, avoiding the occurrence of data-transmission interruptions occurs.

Fig. 6 is referred to again, and the wherein another of the method for the network equipment is selected in the handoff procedure for being the embodiment of the present invention Idiographic flow schematic diagram.The method of the embodiment of the present invention is applied to UE and is switched to 3GPP access nets from the TWAN of non-3 gpp, MME therein is the third network equipment, and HSS is then first network equipment, and TWAN is the second access net, the E- of 3GPP access nets UTRAN is the first access net.The method specifically includes：

S2：UE detects E-UTRAN, determines current sessions being switched to E-UTRAN by TWAN.Can be specifically that user is pre- It first sets preferentially by E-UTRAN core network access the UE to, therefore, when UE detects the corresponding covering signals of E-UTRAN When, that is, initiate the flow that current sessions TWAN is switched to E-UTRAN.Can certainly be that UE detects current E-UTRAN Signal covering it is preferable when, initiate for current sessions TWAN to be switched to the flow of E-UTRAN.

S3：UE initiates attach request Attach Request to MME, and switching instruction Handover can be carried in message Access network information and other information before indication, switching.Specifically, access network information may include previous nothing before switching The information such as line access technology type, previous radio access technology types are WLAN or TWAN here, and Previous may be used RAT=WLAN or Previous RAT=TWAN is indicated.

The second instruction information that the switching request message carries can then cut for what is carried in the Attach Request message Change access network information before instruction and/or switching, naturally it is also possible to be used to indicate connecing of using of the session before switching for others Network is described second to access net or instruction access net that the session uses is accessed net by described second and be switched to described the The information of one access net.

S5：MME sends more new position request Update Location Request to HSS, which includes currently connecing Enter the RAT types of network, MME marks etc., to update the location information of UE.Here the RAT types of present access network are E- UTRAN.The more new position request is additionally operable to the corresponding subscription data of request UE, and the APN and APN for specifically including signing are corresponding The information such as PDN GW marks.

Since UE does not provide APN in attach request, optionally, MME is according to switching instruction in attach request and previous Radio access technology types information carries instruction, such as switching instruction or the instruction from WLAN switchings in more new position request, So that HSS returns to APNs of the UE by WLAN access Web vector graphics according to this instruction.

First request message sent to the first network equipment is specifically as follows the MME in the embodiment of the present invention To more new position request described in HSS transmissions, naturally it is also possible to be used for UE described in HSS acquisition requests described in be other The message of the mark of the first PDN GW used when the second access net core network access, such as authentication request or more new gateway is asked It asks.The first instruction information carried in first request message can be to be carried in the update location request message Switching instruction or the instruction that switches from WLAN pass through WLAN so that HSS according to this instruction returns to UE and access Web vector graphic APN。

S6：HSS determines that the access net of UE changes into E-UTRAN by WLAN, and the APN that are used by WLAN accesses of UE with The APN of 3GPP accesses is different.Specifically, UE can be acquiescence APN or other APN (i.e. non-silent by the APN that WLAN accesses use Recognize APN).

Specifically：HSS can be according in access network information, with more new position request before the switching of the local UE stored RAT is E-UTRAN, determines that the access net of UE changes into E-UTRAN by WLAN；And/or according in more new position request described in S5 The instruction of carrying, such as switching instruction or the instruction from WLAN switchings, determine that the access net of UE changes into E-UTRAN by WLAN. RAT types when access network information is including at least UE access TWAN before the switching of the UE of HSS storages, i.e. RAT=WLAN or RAT= TWAN。

S7：HSS replys update location confirmation message Update Location ACK to MME.It updates in location confirmation message UE is carried by the APN that the is used when TWAN core network access and corresponding UE of APN by being used when TWAN core network access PDN GW marks.

Specifically, the UE carried in update location confirmation message accesses the access point name APN of Web vector graphic by TWAN It can be one or more, wherein at least include the acquiescence APN that UE accesses Web vector graphic by TWAN；To which message includes every The mark of the corresponding PDN GW of a APN.PDN GW mark can be the addresses PDN GW or PDN GW FQDN, in the present embodiment with The addresses PDN GW that are identified as of the PDN GW illustrate.

S8：Since UE does not provide APN in attach request, before MME is according to the switching instruction and/or switching in attach request Access network information, in selection update location confirmation message the UE that carries by credible WLAN access Web vector graphic acquiescence APN and PDN GW indicated by marks of its corresponding UE by the PDN GW used when TWAN core network access, as UE current sessions It is switched to APN the and PDN GW used after the E-UTRAN.

S9：MME establishes session request Create Session Request to S-GW transmissions, and message includes being determined in S8 APN and its corresponding PDN GW address, switching instruction and other information.

S10：S-GW establishes session request according to the addresses PDN GW in S9, to the PDN GW transmissions, and message includes switching Instruction and other information.

S11. if using PCC in network（Policy and Charging Control, dynamic strategy and charging control System）, then according to switching instruction, PDN GW are to PCRF（Policy and Charging Rules Function, policy, billing rule Then functional entity）Initiate IP-CAN（Internet Protocol-Connectivity Access Network, IP connections connect Enter network）Session modification process, to obtain the strategy that UE is switched to session service quality QoS after new access network E-UTRAN With charging regulation.

S14：UE establishes radio access bearer by E-UTRAN.

S18：S-GW sends modification carrying response to MME.

S19：UE begins through E-UTRAN and sends and receives data.

Refer to Fig. 7 again, be the embodiment of the present invention handoff procedure in selection the network equipment method wherein another Idiographic flow schematic diagram.Equally, the present embodiment the method includes UE to switch to 3GPP networks from the TWAN of non-3 GPP network E-UPRAN in, MME therein is the third network equipment, and HSS is then first network equipment, and 3GPP AAA therein Server is second network equipment, and TWAN is the second access net, and the E-UTRAN of 3GPP access nets is the first access net.The side Method specifically includes：

S3：UE initiates to adhere to MME（Register）Attach Request are asked, switching instruction can be carried in message, APN can also be carried, UE requests is used to refer to and establishes（Or switching）Corresponding to the PDN connections of the APN, which can be acquiescence APN or other APN (i.e. non-default APN).

It is described that receive the switching request message that user equipment is sent can be specially the UE of the embodiment of the present invention to MME The attach request of transmission, it is of course also possible to for others be used to indicate the access net that uses the session of the user equipment by Second access net such as TWAN is switched to the request message of the first access net such as E-UTRAN.

And the second instruction information that the switching request message carries then is specifically as follows and is carried in the attach request Switching instruction, naturally it is also possible to be that other to be used to indicate the access net that the session before switching uses be described second to access net Or the access net that the session uses is accessed the information that net is switched to the first access net by instruction by described second.

S5：It includes being currently accessed that MME sends more new position request Update Location Request, message to HSS The RAT of network, MME mark etc., to update the location information of the UE.At this point, the RAT of present access network is E-UTRAN, That is RAT=E-UTRAN.Switching instruction can also be carried in update location request message and UE is provided in Attach Request message APN.The more new position request is additionally operable to the corresponding subscription data of request UE, and the APN and APN for specifically including signing are corresponding The information such as PDNGW marks.

First instruction message carried in first request message is specifically as follows first request message The switching instruction of middle carrying and/or the RAT types of UE present access networks.

S6：HSS determines that the access net of UE changes into E-UTRAN by WLAN, and can be with further, it is determined that UE passes through The APN that WLAN accesses use is different from the APN that 3GPP is accessed or UE accesses net by WLAN core network access and by 3GPP The APN that core network access uses is identical but the corresponding PDN GW of APN may be different.Specifically, what UE was used by WLAN accesses APN can be acquiescence APN or other APN (i.e. non-default APN).

Specifically：HSS can be according in access network information, with more new position request before the switching for the UE being locally stored RAT is E-UTRAN, determines that the access net of UE changes into E-UTRAN by WLAN；It can also be according further in more new position request The switching of carrying indicates, determines that the access net of UE changes into E-UTRAN by WLAN.Access net letter before the switching of the UE of HSS storages Breath includes at least RAT types when UE access TWAN, i.e. RAT=WLAN or RAT=TWAN.

S7：HSS sends update packet data web gateway identification triggering message Update PDN to 3GPP AAA Server GW Identity Trigger, when being linked into core net by TWAN to HSS updates UE for triggering 3GPP AAA Server The mark of the grouped data network gateway used.User identifier is carried in update packet data web gateway identification triggering message； The UE being locally stored can also be carried, the APN or step 5MME of Web vector graphic are accessed in update location request message by WLAN The APN of middle offer.Specifically, the user identifier in update packet data web gateway identification triggering message is IMSI （International Mobile Subscriber Identification Number, international mobile subscriber identity）.

S8：3GPP AAA Server send update packet data web gateway identification request message Update PDN to HSS GW Identity Request, wherein carrying APN when UE is linked into core net by TWAN access nets and its corresponding PDN GW Mark；Or according to the APN in update packet data web gateway identification triggering message, when carrying UE by TWAN core network access The corresponding PDN GW marks of the APN.

S9：HSS sends update packet data web gateway identification confirmation message Update PDN to 3GPP AAA Server GW Identity ACK。

S10：HSS replys update location confirmation message Update Location ACK to MME.Update location confirmation message The PDN GW marks that include HSS receive in step 8 can also include UE by the APN that is used when TWAN core network access, Wherein at least one APN is corresponding with the PDN GW marks that HSS is received in step S8.Specifically, being connect in step S8 with HSS The PDN GW received identify corresponding APN, can be the acquiescence APN used when UE accesses net core network access by TWAN, Or APN identical with the APN that UE is provided in attach request（If UE provides APN in attach request）.

S11：MME is indicated according to the UE APN provided in attach request and switching, in selection update location confirmation message PDN GW indicated by marks of the UE corresponding with the APN by the PDN GW used when TWAN core network access, work as UE Preceding session is switched to the PDN GW used after the E-UTRAN.If UE does not provide APN, MME selection updates in attach request The UE carried in location confirmation message is received by the acquiescence APN and HSS used when TWAN core network access in step S8 The corresponding PDN GW marks of acquiescence APN, APN the and PDN GW used after the E-UTRAN are switched to as UE current sessions.

It should be noted that establishing the PDN connections of identical APN if switching preceding UE and accessing net in E-UTRAN, and make With different PDN GW, MME according to carrier policy, the corresponding PDN GW of the APN in E-UTRAN access nets can be selected. It will use different PDN GW, IP address that will change in this way, being switched to the PDN connections of the APN of 3GPP by WLAN, it can not Realize the seamless switching of IP operation；But other benefits can be brought, such as the same APN is avoided to use two or more PDN GW Caused by additional bandwidth occupancy.

Following S12 to S24 is after MME obtains the first APN and its corresponding first PDN GW marks, and the session of initiation is built Vertical flow.

S12：MME establishes session request Create Session Request to S-GW transmissions, and message includes true in S11 The fixed addresses APN and PDN GW, switching instruction and other information.

S13：S-GW establishes session request according to the addresses PDN GW in session request are established, to the PDN GW transmissions, disappears Breath includes switching instruction and other information.

S14：If using PCC in network（Policy and Charging Control, dynamic strategy and charging control System）, then according to switching instruction, PDN GW are to PCRF（Policy and Charging Rules Function, policy, billing rule Then functional entity）Initiate IP-CAN（Internet Protocol-Connectivity Access Network, IP connections connect Enter network）Session modification process is switched to the qos policy of session after new access network E-UTRAN to obtain UE and is advised with charging Then.

S15：PDN GW establish conversational response Create Session Response to S-GW transmissions.Foundation establishes session Switching instruction in request, PDN GW are that UE distribution is identical as before switching（Used in TWAN）IP address（Including IPv4 Address or IPv6 prefixes）, and carry in establishing conversational response message.

S16：S-GW establishes conversational response to MME transmissions, wherein carrying the IP address of UE.

S17：UE establishes radio access bearer by E-UTRAN.

S18：MME sends modification carrying request Modify Bearer Request to S-GW, wherein carrying switching instruction.

S19：According to switching instruction, S-GW sends modification carrying request to PDN GW, make PDN GW by grouped data by TWAN access systems go to E-UTRAN, and immediately begin to send grouped data to S-GW.

S20：PDN GW send modification carrying response Modify Bearer Response to S-GW.

S21：S-GW sends modification carrying response to MME.

S22：UE begins through E-UTRAN and sends and receives data.

S23：If there are multiple PDN connections, UE, and other PDN connections to be then switched to E- by TWAN accesses one by one by UE UTRAN。

S24：PDN GW access net to TWAN and initiate resource release process, and corresponding bearing resource is accessed to discharge TWAN.

It should be noted that if MME has selected the different PDN GW of PDN GW accessed from WLAN before switching, such as UE establishes the PDN connections of identical APN in 3GPP access nets before switching described in S11, and when having used different PDN GW, Switching instruction will not be carried by establishing in conversation request message.Subsequent session establishment step and existing EPS（Evolved Packet System, grouping (communication) system of evolution）MME establishes session request and wherein to S-GW transmissions in attaching process Subsequent step not comprising switching instruction is identical.

The embodiment of the present invention discloses the flow that a complete UE is switched to the first access net from the second access net, in reality It is that UE selects the same PDN GW that it is front and back, which to have showed access network switching, to ensure that UE can use identical IP address into guild The case where talking about, avoiding the occurrence of data-transmission interruptions occurs.

Refer to Fig. 8 again, be the embodiment of the present invention handoff procedure in selection the network equipment method wherein another Idiographic flow schematic diagram.The present embodiment the method includes UE that the E- of 3GPP networks is switched to from the TWAN of non-3 GPP network In UPRAN, MME therein is the third network equipment, and HSS is then first network equipment, and 3GPP AAA Server therein For second network equipment, TWAN is the second access net, and the E-UTRAN of 3GPP access nets is the first access net.The method is specific Including：

S3：UE initiates attach request Attach Request to MME, and switching instruction can be carried in message, is gone back in message APN can be carried, UE requests is used to refer to and establishes（Or switching）The PDN connections of the APN, the APN can be acquiescence APN or other APN (i.e. non-default APN).

It is described to receive the switching request message that user equipment is sent and be specifically as follows the UE of the embodiment of the present invention to MME The attach request of transmission, it is of course also possible to for others be used to indicate the access net that uses the session of the user equipment by Second access net such as TWAN is switched to the request message of the first access net such as E-UTRAN.

The second instruction information can be then the switching instruction carried in the attach request, naturally it is also possible to be it His is used to indicate the access net second access net or indicate to use the session that the preceding session of switching uses Access net accesses the information that net is switched to the first access net by described second.

S5：It includes being currently accessed that MME sends more new position request Update Location Request, message to HSS The RAT of network, MME mark etc., to update the location information of UE.At this point, the RAT of present access network is E-UTRAN, i.e. RAT= E-UTRAN.HSS returns to the information such as subscription data to MME.It should be noted that the step for existing MME to HSS update The positions UE are identical with subscription data process is obtained.

S6：MME selects PDN GW-2 according to the attach request of subscription data and UE, and establishes session to S-GW transmissions and ask It asks, wherein carrying the address of switching instruction and PDN GW-2.

S7：S-GW establishes session request to PDN GW-2 transmissions, wherein carrying switching instruction.That is MME is according to the user The second access point name that equipment is contracted in the E-UTRAN corresponding with the second access point name described in E-UTRAN The mark of two grouped data network gateways selects second packet data network gateway, is sent out to the second packet data network gateway It send and establishes conversation request message.

S8：PDN GW-2 None- identifieds establish the instruction of the switching in session request, therefore establish session to S-GW transmissions and return Multiple message wherein carrying refusal or failure cause shows that switching, such as Cause=invalid handover can not be executed Indication (reason=invalid switching indicates).

Conversation failure is established in the instruction that the second packet data network gateway is sent or the message of handover failure specifically may be used Think that the PDN GW-2 in the embodiment of the present invention establish session to S-GW transmissions and reply message, naturally it is also possible to for others Refusal or failure cause are carried, shows that switching can not be executed or establishes the message of conversation failure.

S9：S-GW will establish session reply and be transmitted to MME.

S10：MME sends gateway update request to HSS, with the PDN GW that please be looked for novelty.It can be carried in gateway update request Instruction, such as " switching can not execute " or " the PDN GW that please be looked for novelty " instruction, can also carry other information, such as：User identifier （That is IMSI）, APN, PDN GW-2 mark etc..Specifically, gateway update request can be notice request Notify Request or other is used to ask update grouped data network gateway, to realize the message of switching.

First request message sent to the first network equipment is specifically as follows the MME in the embodiment of the present invention The gateway sent to HSS updates request, naturally it is also possible to be other described for passing through to UE described in HSS acquisition requests The message of the mark of the first PDN GW used when the second access net core network access.

The first instruction information carried in first request message can be in first request message " switching can not execute " or " the PDN GW that please be look for novelty " instruction.

S11：HSS can be determined according to access network information before the switching for the UE being locally stored and/or gateway update request The access net of UE changes into E-UTRAN by WLAN, and can with further, it is determined that the APN that are used by WLAN accesses of UE with The APN of 3GPP accesses is different or UE accesses the APN that net core network access uses by WLAN core network access with by 3GPP The corresponding PDN GW of identical but APN may be different.Specifically, UE by the APN that uses of WLAN accesses can be acquiescence APN or its Its APN (i.e. non-default APN).RAT classes when access network information is including at least UE access TWAN before the switching of the UE of HSS storages Type, i.e. RAT=WLAN or RAT=TWAN.

S12：HSS sends update PDN GW mark triggering message UpdatePDN GW to 3GPP AAA Server Identity Trigger, wherein carrying user identifier（That is IMSI）, the UE being locally stored can also be carried and accessed by WLAN The APN that the APN or step S8MME of Web vector graphic are provided in notification request message.

S13：3GPP AAA Server send update PDN GW identification request message Update PDN GW to HSS Identity Request, wherein the APN and its corresponding PDN GW that carry when UE is linked into core net by TWAN access nets are marked Know；Or according to the APN in update PDN GW mark triggering message, it is corresponding by APN when TWAN core network access to carry UE PDN GW marks.That is the mark of the first APN and corresponding first PDN GW.

S14：HSS sends update PDN GW identity validation message Update PDN GW to 3GPP AAA Server Identity ACK。

S15：HSS replys gateway update response to MME, the PDN GW marks that HSS is received in S13 is carried in message, also UE can be carried to receive in step S13 by the APN that uses when TWAN core network access, wherein at least one APN and HSS PDN GW mark it is corresponding.Specifically, the PDN GW marks received in step S13 with HSS corresponding APN, Ke Yishi The acquiescence APN that UE is used when accessing net core network access by TWAN, or it is identical with the APN that UE is provided in attach request APN（If UE provides APN in attach request）.Specifically, gateway update response can be push-notification-answer Notify Answer or other is used to provide new packet data web gateway identification, to realize the message of switching.

The first response message that the first network equipment of the reception is sent is specifically as follows in the embodiment of the present invention The push-notification-answer replied of the HSS, naturally it is also possible to for other response messages for responding the requests of S10, wherein can TWAN core network access is passed through by the corresponding UE of access point name APN, APN used when TWAN core network access to carry UE When the information such as the mark of PDN GW that uses.

Following S16 to S28 is after MME obtains the first APN and its corresponding first PDN GW marks, and the session of initiation is built Vertical flow.

S16：MME establishes session to S-GW transmissions and asks according to the PDN GW mark selection PDN GW-1 in push-notification-answer It asks, wherein APN is carried, the address of switching instruction and PDN GW-1.

S17：S-GW establishes session request to PDN GW-1 transmissions, wherein carrying switching instruction.

S18：If using PCC in network（Policy and Charging Control, dynamic strategy and charging control System）, then according to switching instruction, PDN GW-1 are to PCRF（Policy and Charging Rules Function, policy, billing Regulation function entity）Initiate IP-CAN（Internet Protocol-Connectivity Access Network, IP connections Access network）Session modification process is switched to the qos policy of session and charging after new access network E-UTRAN to obtain UE Rule.

S19：PDN GW-1 establish conversational response Create Session Response to S-GW transmissions.According to foundation meeting Switching instruction in words request, PDN GW-1 are that UE distribution is identical as before switching（Web vector graphic is accessed in TWAN）IP Location（Including the addresses IPv4 or IPv6 prefixes）, and carry in establishing conversational response message.

S20：S-GW establishes conversational response to MME transmissions, wherein carrying the IP address of UE.

S21：UE establishes radio access bearer by E-UTRAN.

S22：MME sends modification carrying request Modify Bearer Request to S-GW, wherein carrying switching instruction.

S23：According to switching instruction, S-GW sends modification carrying request to PDN GW, make PDN GW-1 by grouped data by TWAN access systems go to E-UTRAN, and immediately begin to send grouped data to S-GW.

S24：PDN GW send modification carrying response Modify Bearer Response to S-GW.

S25：S-GW sends modification carrying response to MME.

S26：UE begins through E-UTRAN and sends and receives data.

S27：If there are multiple PDN connections, UE, and other PDN connections to be then switched to E- by TWAN accesses one by one by UE UTRAN。

S28：PDN GW access net to TWAN and initiate resource release process, and corresponding bearing resource is accessed to discharge TWAN.

Below to selecting the device of the network equipment to be described in detail in the handoff procedure of the embodiment of the present invention.

Fig. 9 is referred to, the structure composition of the device of the network equipment is selected in a kind of handoff procedure for being the embodiment of the present invention Schematic diagram.The described device of the embodiment of the present invention may be disposed in the equipment with network equipment selection function such as MME, the dress Set including：

Switching request message reception units 11, for receiving the instruction of user equipment transmission by the session of the user equipment The access net used is switched to the switching request message of the first access net by the second access net；

First acquisition unit 12 is used for obtaining when the user equipment accesses net core network access by described second The first access point name；

Second acquisition unit 13 is connect for obtaining the user equipment from first network equipment by the second access net Enter the mark of the first grouped data network gateway corresponding with first access point name used when core net, described first The network equipment is the network equipment that network side is managed the user equipment, and the management is：Signing management, authentication management With it is one or more in location management；

Selecting unit 14, the first Access Point Name for selecting the acquiring unit to obtain are referred to as the user equipment The session is switched to the access point name used after the first access net, the first grouping for selecting the acquiring unit to obtain Grouped data network gateway indicated by the mark of data network gateway is switched to institute as the session of the user equipment State the grouped data network gateway used after the first access net.

User equipment (UE) can be receive user network switching instruction when, or detecting covering signal be better than When the second access net of the first access net, generates and sends corresponding instruction and connect what the session of the user equipment used It networks and is switched to the switching request message of the first access net by the second access net, which is specifically used for request and carries out The message of network switching carries out equipment when the switching request message reception units 11 receive the switching request message Selection operation.

The first network equipment is the network equipment that network side is managed the user equipment, such as ownership signing Server HSS or authentication server etc., the management are：Signing management, authentication management and one kind or more in location management Kind.When UE is by the second access net core network access, is stored in first network equipment and manage as the UE APN distributed and make PDN GW.

First access point name that the first acquisition unit 12 obtains can be directly from the switching request message Middle acquisition, that is to say, that UE can carry the user equipment in the switching request message and be connect by the second access net Enter the first access point name used when core net；That is the first access point name can the user equipment directly report. Or：First access point name can obtain the user equipment from the first network equipment and be accessed by described second The first access point name used when net core network access, you can be according to the information such as the mark of user equipment (UE) to such as HSS Request obtains after searching in equal first networks equipment.

And the second acquisition unit 13 obtains the first grouped data network gateway i.e. mark of the first PDN GW, then it can be with After the first APN of the UE is determined, according to the mark for getting corresponding first PDN GW in APN to first network equipment Know.Certainly, in other embodiments, can also be obtained from the first networks equipment such as such as HSS according to the mark of user equipment (UE), The mark of the first PDN GW can be the first addresses PDN GW or PDN GW FQDN（Fully Qualified Domain Name, full name domain name）Deng.

UE is still linked into the first access net by APN the and PDN GW used in the second access net, is connect to realize Enter into core net and carries out the operations such as Various types of data access, interaction.

Further specifically, the selecting unit 14 can be used for, according to the second instruction information, first access is selected The session that roll-call is referred to as the user equipment is switched to the access point name used after the first access net, selects institute State the meeting of the grouped data network gateway indicated by the mark of the first grouped data network gateway as the user equipment Words are switched to the grouped data network gateway used after the first access net, wherein the second instruction information instruction switching The access net that the preceding session uses is the second access net or indicates the access net for using the session by described second Access net is switched to the first access net, and the switching request message and/or first response message carry described second Indicate information.

Further, as shown in Figure 10, the second acquisition unit 13 in Fig. 9 can specifically include：

First request message transmission sub-unit 131, it is described for sending the first request message to the first network equipment First request message used when accessing net core network access by described second for user equipment described in acquisition request first The mark of grouped data network gateway；

First response message receiving subelement 132 is asked for sending first in the first request message transmission sub-unit After seeking message, the first response message that the first network equipment is sent is received, is at least carried in first response message The mark of first grouped data network gateway, the mark of first grouped data network gateway and first access point Title is corresponding.

Wherein, first request message is that position updating request or authentication request or gateway update are asked, described first Response message is location updating response or Authentication Response or gateway update response, the first network equipment are home subscribed services Device or authentication server.

May include in the first request message that the first request message transmission sub-unit 131 is sent the UE mark or First APN used in person's user information or the access net of UE access second（What UE was directly reported）Deng in order to HSS etc. first The network equipment can search used PDN GW when the UE access second access net in the PDN GW marks being locally stored Mark, and return to the PDN GW marks found.

Further, in the first request message that the first request message transmission sub-unit 131 is sent first is carried to refer to Show information, so that the first network equipment determines the access that the user equipment uses according at least to the first instruction information The step of net executes the first response message of the transmission after becoming the first access net from the second access net, described the The access net that the session uses before one instruction information instruction switching accesses net for described second or instruction uses the session Access net by it is described second access net be switched to it is described first access net.

Further, the mark for the first grouped data network gateway that the second acquisition unit 13 obtains is specifically by described First network equipment is obtained from second network equipment, and second network equipment is that the user equipment is accessed by described second The authentication server used when net core network access.

The mark of first grouped data network gateway is specifically obtained by the first network equipment from second network equipment It takes, second network equipment is the authentication service used when the user equipment accesses net core network access by described second Device.I.e.：The first networks such as HSS equipment can also be when receiving first request message, according to being identified to for corresponding UE Such as AAA Server for authenticated, authorize and second network equipment of charging in obtain the UE access first access net Used PDN GW marks, in order to which first network equipment can return to the mark of corresponding PDN GW according to the first request message Know.

In addition, the first acquisition unit 12 is specifically used for obtaining first access point from the switching request message Title, the switching request message carry first used when the user equipment accesses net core network access by described second Access point name；Alternatively, accessing net by described second specifically for obtaining the user equipment from the first network equipment The first access point name used when core network access.

Further, first access point name can also be carried in the switching request message, so that described first Carry first access point name in request message, and then so that the first network equipment according to first request message Obtain the mark of first grouped data network gateway corresponding with first access point name.

The embodiment of the present invention discloses the flow that a complete UE is switched to the first access net from the second access net, at this It is that UE selects the same PDN GW before and after realizing access network switching by completely new interactive mode in the flow of embodiment, So that UE occurs the case where capable of being conversated using identical IP address, be avoided the occurrence of data-transmission interruptions.

Figure 11 is referred to again, and the structure of the device of the network equipment is selected in another handoff procedure for being the embodiment of the present invention Composition schematic diagram.The described device of the embodiment of the present invention may be disposed in the equipment with network equipment selection function such as MME, packet Above-mentioned switching request message reception units 11, first acquisition unit 12, second acquisition unit 13 and selecting unit 14 are included, into One step, described device further includes：

Conversation request message transmission unit 15 is established, for receiving described cut in the switching request message reception units It changes after request message, before the mark that the second acquisition unit obtains first grouped data network gateway, according to The second access point name that the user equipment is contracted in the first access network and in the first access network described The mark of the corresponding second packet data network gateway of two access point name selects second packet data network gateway, to described the Conversation request message is established in the transmission of two grouped data network gateways；

Execution unit 16, the instruction for receiving the second packet data network gateway transmission are established conversation failure or are cut After changing failure news, the second acquisition unit 13 is notified to obtain the user equipment by described the from first network equipment The mark of the first grouped data network gateway corresponding with first access point name used when two access net core network access Know.

In the embodiment of the present invention, receives the instruction that UE is sent in the switching request message reception units 11 and use session Access net the switching request message of the first access net is switched to by the second access net after, second acquisition unit 13 is from the Before one network equipment obtains the mark of the first grouped data network gateway corresponding with first access point name, by upper That states establishes conversation request message transmission unit 15, and execution unit 16 directly obtains the mark of PDN GW first, according to PDN The mark of GW initiate session connection it is unsuccessful in the case of, then carried out accordingly by first acquisition unit 12 and second acquisition unit 13 Operation.

I.e.：When UE switches between access is netted, it can first pass through and distribute the mode of new APN and PDN GW and initiate UE to connecing The connection building process of networking, connection establish it is unsuccessful after, then flow disclosed through the embodiment of the present invention obtains in original The network equipments such as the PDN GW used in access net, it is ensured that after UE is switched to another access net, IP address will not change, and keep away The problem of having exempted from the IP traffic Transmission of UE.

Figure 12 is referred to again, and the structure of the device of the network equipment is selected in another handoff procedure for being the embodiment of the present invention Composition schematic diagram.Device described in the embodiment of the present invention can be arranged in such as home subscribed services device HSS or authentication service In the network equipment that device etc. is managed the user equipment, specifically, described device includes：

First request message receiving unit 21, the first request message for receiving the transmission of the third network equipment, described the One request message is the third network equipment in the instruction access net that uses session for receiving user equipment transmission by the Two access nets, which are switched to, to be sent after the switching request message of the first access net, and first request message is used for acquisition request institute The mark of the first grouped data network gateway used when user equipment accesses net core network access by described second is stated, it is described The third network equipment is the network equipment for selecting grouped data network gateway；

First response message transmission unit 22, for sending the first response message to the third network equipment, described the The mark of first grouped data network gateway is at least carried in one response message, so that third network equipment selection the The session that one Access Point Name is referred to as the user equipment is switched to the access point name used after the first access net, And select the grouped data network gateway indicated by the mark of first grouped data network gateway as the user equipment The session be switched to the grouped data network gateway that uses after the first access net, wherein first Access Point Name The access point name that the referred to as described user equipment uses when accessing net core network access by described second, first access point Title is obtained by the third network equipment from the switching request message or first response message, first grouping The mark of data network gateway is corresponding with first access point name.

The first request message in the first request message receiving unit 21 be position updating request or authentication request or Gateway update request, first response message, which can be responded or be authenticated for location updating corresponding to first request message, to be rung It answers or gateway update response, the first network equipment is home subscribed services device or authentication server.

Further, described device further includes：

Determination unit 23, for before the first response message transmission unit 22 sends first response message, Determine that the access net that the user equipment uses becomes the first access net from the second access net.The determination unit 23 It is specifically used for：Before the first response message transmission unit 22 sends first response message, refer to according at least to first Show that the access net that information determines that the user equipment uses becomes the first access net from the second access net, wherein institute It states the access net that the preceding session of the first instruction information instruction switching uses and accesses net or instruction by the session for described second The access net used accesses net by described second and is switched to the first access net, and first request message carries described first Indicate information；Or, before the first response message transmission unit 22 sends first response message, described in determination The radio access technology types of user equipment access net by described second and change into the first access net, determine that the user sets The standby access net used becomes the first access net from the second access net.

Further specifically, the mark tool of first grouped data network gateway carried in first response message Body can be obtained from second network equipment, wherein second network equipment is that the user equipment is accessed by described second The authentication server used when net core network access.First packet data network is at least carried in first response message The mark of gateway includes：First access point name and first packet data network are carried in first response message The mark of gateway.

Further, first access point name can also be carried in the switching request message, so that described first First access point name is carried in request message, according to first Access Point Name carried in first request message Claim, the mark of first grouped data network gateway, first packet count are at least carried in first response message It is corresponding with first access point name according to the mark of network gateway.

Further, the determination unit 23 of described device, is specifically additionally operable to：

Before the first response message transmission unit 22 sends first response message, the user equipment is determined First access point name used when accessing net core network access by described second passes through described with the user equipment The second access point name used when the first access net core network access is different；Alternatively,

Before the first response message transmission unit 22 sends first response message, the user equipment is determined First access point name used when accessing net core network access by second is with the user equipment by described first The second access point name for using is identical when accessing net core network access, but the mark of first grouped data network gateway with The mark for the second packet data network gateway that the user equipment uses when accessing net core network access by described first is not Together, the mark of the second packet data network gateway is corresponding with second access point name.

When UE switches between access is netted, the flow acquisition that can be disclosed through the embodiment of the present invention makes in original access net The network equipments such as PDN GW, it is ensured that after UE is switched to another access net, IP address will not change, and avoid the IP of UE The problem of data stream transmitting interrupts.

In other embodiments of the invention, a kind of computer storage media, the computer storage media are additionally provided It can have program stored therein, include such as any one corresponding embodiment of the method for above-mentioned Fig. 1 to Fig. 8 when which executes.

In other embodiments of the invention, a kind of network equipment is additionally provided.It is that the embodiment of the present invention carries referring to Figure 13 A kind of structure composition schematic diagram of the network equipment supplied, the network equipment of the embodiment of the present invention, which can be MME etc., has net The equipment of network equipment selection function, specifically, the network equipment includes：Transmitter 100, receiver 200 and processor 300, wherein the processor 300 executes following steps：

It controls the receiver 200 and receives the access that the instruction that user equipment is sent uses the session of the user equipment Net is switched to the switching request message of the first access net by the second access net；

Further, the processor 300, which is executed from the first network equipment acquisition user equipment, passes through described second Access the mark of the first grouped data network gateway corresponding with first access point name used when net core network access The step of, including：

It controls the transmitter 100 and sends the first request message, first request message to the first network equipment The first packet data network used when accessing net core network access by described second for user equipment described in acquisition request The mark of gateway；

It controls the receiver 200 and receives the first response message that the first network equipment is sent, first response At least carry the mark of first grouped data network gateway in message, the mark of first grouped data network gateway with First access point name is corresponding.

Wherein, the processor 300 controls the transmitter 100 and sends the first request message to the first network equipment For position updating request or authentication request or gateway update request, first response message is that location updating responds or authentication is rung It answers or gateway update response, the first network equipment is home subscribed services device or authentication server.

Further, the processor 300 also executes the following steps：

Wherein, the mark for first grouped data network gateway that the processor 300 obtains is specifically by described first The network equipment is obtained from second network equipment, and second network equipment is that the user equipment is connect by the second access net Enter the authentication server used when core net.

Further, the processor 300 executes selection first Access Point Name and is referred to as the user equipment The session be switched to the access point name that uses after the first access net, select first grouped data network gateway Mark indicated by grouped data network gateway as the session of the user equipment be switched to it is described first access net The step of grouped data network gateway used afterwards is specially：

Further, the processor 300, which executes, described obtain the user equipment and passes through the second access net access The first access point name used when core net is specially：

The processor 300 controls in the switching request message that the receiver 200 receives and carries described first Access point name, so as to first access point name is carried in first request message, and then so that the first network Equipment obtains first Packet Data Network network diagram corresponding with first access point name according to first request message The mark of pass.

The processor 300 execute access net that the instruction sent in the reception user equipment uses session by Second access net be switched to it is described first access net switching request message the step of after, from first network equipment obtain and institute Before the step of stating the mark of corresponding first grouped data network gateway of the first access point name, also execute the following steps：

The processor 300 controls first response message that the receiver 200 receives specifically by described first The network equipment is sent in the case where there：

In the embodiment of the present invention, it is before UE is selected and switched that network side, which has the equipment of network equipment selection function such as MME, Identical gateway device such as PDN GW, to ensure that UE after being switched to new access net by old access net, can continue to make The case where being conversated with identical IP address, avoided the occurrence of data-transmission interruptions occurs.

In other embodiments of the invention, another network equipment is additionally provided.It is the embodiment of the present invention referring to Figure 14 The network equipment of the structure composition schematic diagram of another network equipment of offer, the embodiment of the present invention can be that HSS etc. exists The equipment that network side is managed the user equipment, the management is in signing management, authentication management and location management It is one or more；The network equipment of the embodiment of the present invention includes：Transmitter 400, receiver 500 and processor 600, In, the processor 600 executes following steps：

It controls the receiver 500 and receives the first request message that the third network equipment is sent, first request message The access net that session uses is cut by the second access net in the instruction for receiving user equipment transmission for the third network equipment It is changed to and sends after the switching request message of the first access net, first request message is for user equipment described in acquisition request The mark of the first grouped data network gateway used when accessing net core network access by described second, the third network are set The standby network equipment for selection grouped data network gateway；

It controls the transmitter 400 and sends the first response message, first response message to the third network equipment In at least carry the mark of first grouped data network gateway so that the third network equipment selects the first Access Point Name The session of the referred to as described user equipment is switched to the access point name used after the first access net, and described in selection The session of the grouped data network gateway as the user equipment indicated by the mark of first grouped data network gateway It is switched to the grouped data network gateway used after the first access net, wherein first Access Point Name is known as the use The access point name that family equipment uses when accessing net core network access by described second, first access point name is by described The third network equipment is obtained from the switching request message or first response message, first Packet Data Network network diagram The mark of pass is corresponding with first access point name.

Wherein, the processor 600 controls first request message that the receiver 500 receives and is asked for location updating Ask or authentication request or gateway update request, first response message be location updating respond Authentication Response or gateway update Response, the third network equipment are the network equipment for selecting grouped data network gateway.

Further, the processor 600 is controlling the transmitter 400 to the third network equipment the first sound of transmission Further include executing following steps before the step of answering message：

Determine that the access net that the user equipment uses becomes the first access net from the second access net, specifically For：Determine that access net that the user equipment uses becomes described the from the second access net according at least to the first instruction information One access net, wherein described first indicates that the access net that the preceding session of information instruction switching uses is the second access net Or the access net that the session uses is accessed net by described second and is switched to the first access net, first request by instruction Message carries the first instruction information；Or, by the radio access technology types of the determination user equipment by described second Access net changes into the first access net, determines that the access net that the user equipment uses becomes institute from the second access net State the first access net.

Further, the processor 600 controls carries in first response message of the transmission of the transmitter 400 The mark of first grouped data network gateway is specifically obtained from second network equipment, wherein second network equipment is The authentication server that the user equipment uses when accessing net core network access by described second.

Further, the processor 600 controls at least takes in first response message that the transmitter 400 is sent Mark with first grouped data network gateway includes：First access point name is carried in first response message With the mark of first grouped data network gateway.

Further, the processor 600 also executes the following steps：

First access point name is carried in the switching request message, so as to be carried in first request message First access point name, according to first access point name carried in first request message, described first The mark of first grouped data network gateway, the mark of first grouped data network gateway are at least carried in response message Know corresponding with first access point name.

Further, the processor 600 controls the transmitter 400 and sends the to the third network equipment described Before the step of one response message, following steps are also executed：

In the embodiment of the present invention, network side carries out signing management and/or authentication management and/or position to the user equipment The equipment of management such as HSS etc., being used before to network side there is the equipment of network equipment selection function to provide UE switchings such as MME The mark of APN and gateway device such as PDN GW, to make network side that there is the equipment such as MME of network equipment selection function to be selected for UE It selects and switches preceding identical gateway device such as PDN GW, ensure that UE, can after being switched to new access net by old access net The case where identical IP address conversates, avoids the occurrence of data-transmission interruptions is continuing with to occur.

One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with Relevant hardware is instructed to complete by computer program, the program can be stored in a computer read/write memory medium In, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic Dish, CD, read-only memory（Read-Only Memory, ROM）Or random access memory（Random Access Memory, RAM）Deng.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention All any modification, equivalent and improvement etc., should all carry within protection scope of the present invention made by within refreshing and principle.

Claims

1. a kind of method for selecting the network equipment in handoff procedure, which is characterized in that the method includes：

The instruction that user equipment is sent is received to be switched to the access net that the session of the user equipment uses by the second access net The switching request message of first access net；

The first access point name is obtained from first network equipment, first access point name is the user equipment described in It is used when the second access net core network access；

From first network equipment obtain the user equipment by it is described second access net core network access when use with it is described The mark of corresponding first grouped data network gateway of first access point name, the mark of first grouped data network gateway It is to be obtained from the first network equipment according to the mark of user equipment (UE), the first network equipment is network side to described The network equipment that user equipment is managed, the management are：Signing management, authentication management and one kind or more in location management Kind；

According to the second instruction information, the session that first Access Point Name is referred to as the user equipment is selected to be switched to institute The access point name used after the first access net is stated, the grouping indicated by the mark of first grouped data network gateway is selected Data network gateway is switched to the Packet Data Network used after the first access net as the session of the user equipment Network diagram closes；

Wherein, the access net that the session uses before the second instruction information instruction switching accesses net or instruction for described second The access net that the session uses is accessed into net by described second and is switched to the first access net, the switching request message is taken With the second instruction information.

2. the method as described in claim 1, which is characterized in that described to pass through from the first network equipment acquisition user equipment The the first Packet Data Network network diagram corresponding with first access point name used when the second access net core network access The step of mark of pass, including：

The first request message is sent to the first network equipment, first request message is set for user described in acquisition request For the mark of the first grouped data network gateway used when accessing net core network access by described second；

The first response message that the first network equipment is sent is received, described first is at least carried in first response message The mark of grouped data network gateway, the mark of first grouped data network gateway are opposite with first access point name It answers.

3. method as claimed in claim 2, which is characterized in that first request message is that position updating request or authentication are asked It asks or gateway update is asked, first response message is location updating response or Authentication Response or gateway updates response, described First network equipment is home subscribed services device or authentication server.

4. method as claimed in claim 2 or claim 3, which is characterized in that the method further includes：

The first instruction information is carried in first request message, so that the first network equipment is according at least to described the After one instruction information determines that the access net that the user equipment uses becomes the first access net from the second access net, The step of executing the first response message of the transmission, the access net that the session uses before the first instruction information instruction switching The access net that the session uses described first is switched to by the second access net for the second access net or instruction to connect It networks；And/or

The first network equipment accesses net by described second by the radio access technology types of the determination user equipment and changes Become the first access net, determines that access net that the user equipment uses becomes described first from the second access net and connects The step of the first response message of the transmission being executed after networking.

5. the method as described in claim 1, which is characterized in that the mark of first grouped data network gateway is specifically by institute It states first network equipment to obtain from second network equipment, second network equipment is that the user equipment connects by described second The authentication server used when networking core network access.

6. the method as described in claim 1, which is characterized in that use session in the instruction that the reception user equipment is sent The access net the step of switching request message of the first access net is switched to by the second access net after, set from first network Before the step of standby mark for obtaining the first grouped data network gateway corresponding with first access point name, the method Further include：

The second access point name for being contracted in the first access network according to the user equipment and in the first access net Described in the corresponding second packet data network gateway of the second access point name mark select second packet data network gateway, Conversation request message is established to second packet data network gateway transmission；

It receives after the instruction that the second packet data network gateway is sent establishes the message of conversation failure or handover failure, execution It is described to obtain first grouped data network gateway corresponding with first access point name from the first network equipment Mark the step of.

7. method as claimed in claim 2, which is characterized in that first response message is specifically by the first network equipment It sends in the case where there：

Determine when the user equipment accesses net core network access by described second first access point name that uses with The second access point name that the user equipment uses when accessing net core network access by described first is different；Or,

Determine the user equipment by first access point name that uses when the second access net core network access with it is described The second access point name that user equipment uses when accessing net core network access by described first is identical, but first grouping The second packet that the mark of data network gateway uses when accessing net core network access by described first with the user equipment The mark of data network gateway is different, and the mark of the second packet data network gateway is opposite with second access point name It answers.

8. a kind of method for selecting the network equipment in handoff procedure, which is characterized in that the method includes：

The first request message that the third network equipment is sent is received, first request message is that the third network equipment is connecing It receives the instruction of user equipment transmission and access net that session uses accessed into net by second is switched to the switching of the first access net and ask It asks and sends after message, first request message passes through the second access net access for user equipment described in acquisition request The mark of the first grouped data network gateway used when core net, the third network equipment are selection Packet Data Network network diagram The network equipment of pass；

The first response message is sent to the third network equipment, first grouping is at least carried in first response message The mark of the mark of data network gateway, first grouped data network gateway carried in first response message is specific It is to be obtained according to the mark of user equipment, also carries first access point name in first response message, described the One Access Point Name is known as the access point name used when the user equipment accesses net core network access by described second, so that The session that the third network equipment selects the first Access Point Name to be referred to as the user equipment is switched to described first and connects The access point name used after networking, and select the Packet Data Network indicated by the mark of first grouped data network gateway Network diagram is closed is switched to the grouped data network gateway used after the first access net as the session of the user equipment, Wherein, the mark of first grouped data network gateway is corresponding with first access point name；

Wherein, the third network equipment is to select first Access Point Name to be referred to as the use according to the second instruction information The session of family equipment is switched to the access point name used after the first access net, selects first Packet Data Network The grouped data network gateway indicated by mark that network diagram closes is switched to described first as the session of the user equipment The grouped data network gateway used after access net；Wherein, the preceding session of the second instruction information instruction switching uses Access net be described second access net or instruction by access net that the session uses by described second access net be switched to it is described First access net, the switching request message carry the second instruction information.

9. method as claimed in claim 8, which is characterized in that first request message is that position updating request or authentication are asked It asks or gateway update is asked, first response message is location updating response or Authentication Response or gateway updates response, described The third network equipment is the network equipment for selecting grouped data network gateway.

10. method as claimed in claim 8 or 9, which is characterized in that described to send the first response to the third network equipment Before the step of message, further include：Determine that access net that the user equipment uses becomes described the from the second access net One access net, specially：

Determine that the access net that the user equipment uses becomes described from the second access net according at least to the first instruction information First access net, wherein described first indicates that the access net that the preceding session of information instruction switching uses is second access The access net that the session uses is accessed net by described second and is switched to the first access net by net or instruction, and described first asks Message is asked to carry the first instruction information；Or,

Net is accessed by described second change into first access by the radio access technology types of the determination user equipment Net determines that the access net that the user equipment uses becomes the first access net from the second access net.

11. method as claimed in claim 8, which is characterized in that first grouping carried in first response message The mark of data network gateway is specifically obtained from second network equipment, wherein second network equipment is the user equipment The authentication server used when accessing net core network access by described second.

12. method as claimed in claim 8, which is characterized in that the method further includes：It is taken in the switching request message With first access point name, so as to carry first access point name in first request message.

13. method as claimed in claim 8, which is characterized in that send the first response to the third network equipment described Before the step of message, the method further includes：

14. selecting the device of the network equipment in a kind of handoff procedure, which is characterized in that described device includes：

Switching request message reception units, what the instruction for receiving user equipment transmission used the session of the user equipment Access net is switched to the switching request message of the first access net by the second access net；

First acquisition unit, for obtaining the first access point name from first network equipment, first access point name is institute It states when user equipment accesses net core network access by described second and uses；

Second acquisition unit passes through the second access net access core for obtaining the user equipment from first network equipment The mark of the first grouped data network gateway corresponding with first access point name used when net, first packet count Mark according to network gateway is obtained from the first network equipment according to the mark of user equipment (UE), and the first network is set The standby network equipment being managed to the user equipment for network side, the management are：Signing management, authentication management and position It is one or more in management；

Selecting unit, for selecting the first Access Point Name that the acquiring unit obtains to be referred to as the meeting of the user equipment Words are switched to the access point name used after the first access net, the first Packet Data Network for selecting the acquiring unit to obtain The grouped data network gateway indicated by mark that network diagram closes is switched to described first as the session of the user equipment The grouped data network gateway used after access net；

Wherein, the selecting unit is specifically used for,

According to the second instruction information, the session that first Access Point Name is referred to as the user equipment is selected to be switched to institute The access point name used after the first access net is stated, the grouping indicated by the mark of first grouped data network gateway is selected Data network gateway is switched to the Packet Data Network used after the first access net as the session of the user equipment Network diagram closes, wherein before the second instruction information instruction switching the access net that uses of the session be described second access net or Indicate that the access net that the session uses is accessed net by described second is switched to the first access net, the switching request disappears Breath carries the second instruction information.

15. device as claimed in claim 14, which is characterized in that the second acquisition unit, including：

First request message transmission sub-unit, for sending the first request message to the first network equipment, described first asks The first packet count used when message being asked to access net core network access by described second for user equipment described in acquisition request According to the mark of network gateway；

First response message receiving subelement, for the first request message transmission sub-unit send the first request message it Afterwards, the first response message that the first network equipment is sent is received, described first is at least carried in first response message The mark of grouped data network gateway, the mark of first grouped data network gateway are opposite with first access point name It answers.

16. device as claimed in claim 15, which is characterized in that first request message is position updating request or authentication Request or gateway update request, first response message are location updating response or Authentication Response or gateway update response, institute It is home subscribed services device or authentication server to state first network equipment.

17. device as claimed in claim 15, which is characterized in that the first instruction information is carried in first request message, So that the first network equipment determines access net that the user equipment uses by institute according at least to the first instruction information Stating the second access net becomes the step of the first access net executes the first response message of the transmission later, first instruction The access net that the session uses before information instruction switching is the second access net or the access that instruction uses the session Net accesses net by described second and is switched to the first access net.

18. the device as described in claim 14~17 is any, which is characterized in that first point of the second acquisition unit acquisition The mark of group data network gateway is specifically obtained by the first network equipment from second network equipment, second network equipment The authentication server used when accessing net core network access by described second for the user equipment.

19. device as claimed in claim 14, which is characterized in that described device further includes：

Conversation request message transmission unit is established, for receiving the switching request in the switching request message reception units After message, before the mark that the second acquisition unit obtains first grouped data network gateway, according to the use The second access point name and second access in the first access network that family equipment is contracted in the first access network The mark of the corresponding second packet data network gateway of point title selects second packet data network gateway, to the second packet Conversation request message is established in data network gateway transmission；

Execution unit establishes conversation failure or handover failure for receiving the instruction that the second packet data network gateway is sent Message after, notify the second acquisition unit to obtain the user equipment from first network equipment and pass through the second access net The mark of the first grouped data network gateway corresponding with first access point name used when core network access.

20. selecting the device of the network equipment in a kind of handoff procedure, which is characterized in that described device includes：

First request message receiving unit, the first request message for receiving the transmission of the third network equipment, first request Message is that the access net that the third network equipment uses session in the instruction for receiving user equipment transmission is accessed by second Net, which is switched to, to be sent after the switching request message of the first access net, and first request message is for user described in acquisition request The mark for the first grouped data network gateway that equipment uses when accessing net core network access by described second, the third net Network equipment is to select the network equipment of grouped data network gateway；

First response message transmission unit, for sending the first response message, first response to the third network equipment The mark of first grouped data network gateway, described first carried in first response message are at least carried in message The mark of grouped data network gateway is specifically to be obtained according to the mark of user equipment, is also carried in first response message First access point name, first Access Point Name are known as the user equipment and pass through the second access net access core The access point name used when net, so that the third network equipment selects the first Access Point Name to be referred to as the user equipment The session is switched to the access point name used after the first access net, and selects first grouped data network gateway Mark indicated by grouped data network gateway as the session of the user equipment be switched to it is described first access net The grouped data network gateway used afterwards, wherein the mark of first grouped data network gateway and first access point Title is corresponding；

21. device as claimed in claim 20, which is characterized in that first request message is position updating request or authentication Request or gateway update request, first response message are location updating response or Authentication Response or gateway update response, institute It is the network equipment for selecting grouped data network gateway to state the third network equipment.

22. the device as described in claim 20 or 21, which is characterized in that described device further includes：

Determination unit, described in before the first response message transmission unit sends first response message, determining The access net that user equipment uses becomes the first access net from the second access net.

23. device as claimed in claim 22, which is characterized in that the determination unit is specifically used for：

It is true according at least to the first instruction information before the first response message transmission unit sends first response message The access net that the fixed user equipment uses becomes the first access net from the second access net, wherein described first refers to Show that the access net that the preceding session of information instruction switching uses is that the second access net or instruction connect what the session used It networks and the first access net is switched to by the second access net, first request message carries the first instruction letter Breath；Or,

Before the first response message transmission unit sends first response message, pass through the determination user equipment Radio access technology types access net by described second and change into the first access net, determine that the user equipment used connects Network becomes the first access net from the second access net.

24. device as claimed in claim 20, which is characterized in that first grouping carried in first response message The mark of data network gateway is specifically obtained from second network equipment, wherein second network equipment is the user equipment The authentication server used when accessing net core network access by described second.

25. device as claimed in claim 20, which is characterized in that carry first access point in the switching request message Title, so as to carry first access point name in first request message.

26. device as claimed in claim 20, which is characterized in that described device further includes determination unit, is specifically used for：

Before the first response message transmission unit sends first response message, determine that the user equipment passes through institute First access point name used when the second access net core network access is stated to connect by described first with the user equipment The second access point name used when networking core network access is different；Alternatively,

Before the first response message transmission unit sends first response message, determine the user equipment by the First access point name used when two access net core network access accesses net with the user equipment by described first The second access point name used when core network access is identical, but the mark of first grouped data network gateway and the use The mark for the second packet data network gateway that family equipment uses when accessing net core network access by described first is different, described The mark of second packet data network gateway is corresponding with second access point name.