CN102781055B

CN102781055B - Data transmission method, radio access network device and communication system

Info

Publication number: CN102781055B
Application number: CN201110121348.2A
Authority: CN
Inventors: 靳维生
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2011-05-11
Filing date: 2011-05-11
Publication date: 2017-04-12
Anticipated expiration: 2031-05-11
Also published as: CN102781055A; WO2012152226A1

Abstract

The invention discloses a data transmission method. The data transmission method includes the following steps: the handover request message sent by a source RAN (radio access network), which includes the information of radio access bearers (RAB) to be established and a local IP access packet data network (LIPA PDN) connection establishment instruction, is received by a target RAN; according to the received LIPA PDN connection establishment instruction, whether the target RAN supports handover guaranteeing the continuity of LIPA PDN service or not is determined; if the target RAN supports handover guaranteeing the continuity of LIPA PDN service, then the target RAN allocates LIPA PDN connection bearer resource according to the LIPA PDN connection establishment instruction, and allocates RAB resource according to the information of RABs to be established; the target RAN sends a handover request response message to the source RAN, and the handover request response message includes the information of the LIPA PDN connection bearer resource and the information of the RAB resource.

Description

The method of data transfer, wireless access network equipment and communication system

Technical field

The present invention relates to wireless communication field, more particularly to a kind of method of data transfer, wireless access network equipment and logical Letter system.

Background technology

3GPP (3rd Generation Partnership Project, third generation partner program) is in version 8 Version definition after (Release 8) Home eNodeB, for extending the covering of mobile network, and provides more being directed to The service of property.Home eNodeB can be deployed in family or enterprise, be connected with the network of mobile operator by broadband connection.Have The mobile terminal of Home eNodeB authority is accessed, the net of mobile operator can be accessed by the Home eNodeB of 3G or LTE standards Network is obtaining service.

Can be with enterprise or home deployments local network using Home eNodeB.The mobile terminal energy of access to family base station The local network disposed by Home eNodeB is enough accessed, and customer traffic need not be through Operator Core Network.3GPP is in version 10 Defined in mobile terminal method that local IP access (Local IP Access, LIPA) carried out by Home eNodeB.In the party In method, the LTE home evolution base station (Home eNodeB, HeNB) of LTE (Long Term Evolution, Long Term Evolution) system Local gateway (Local Gateway, L-GW) is added with the 3G Home eNodeB (Home NodeB, HNB) of 3G systems.

In the LIPA frameworks of the LTE and 3G systems defined in version 10, L-GW must be unified with base station.But, When user equipment is switched to another Target cell from a cell-of-origin, as L-GW is unification with base station, therefore Existing framework is it cannot be guaranteed that the business continuance of LIPA packet data network (Packet Data Network, PDN).

The content of the invention

In order to solve the problems, such as when cell switches it cannot be guaranteed that LIPAPDN business continuances, embodiment of the present invention offer A kind of method of data transfer, wireless access network equipment and communication system.

The technical scheme is as follows：

A kind of method of data transfer, including：

Target radio access network RAN receives the handover request message that source RAN sends, and includes and treat in the handover request message The RAB RAB information of foundation is indicated with local IP access packet data network LIPAPDN connections are set up；

Target RAN connects instruction according to the LIPA PDN that set up for receiving, and determines whether target RAN props up Hold the switching for ensureing LIPAPDN business continuances；

If target RAN supports the switching for ensureing LIPA PDN business continuances, target RAN is according to described Set up LIPA PDN connections and indicate distribution LIPA PDN connection bearing resources, according to the RAB information distribution RAB moneys to be set up Source；

Target RAN sends handover request ack message to the source RAN, includes in the handover request ack message The information of the information and RAB resources of the LIPA PDN connections bearing resource, so that the source RAN is according to the LIPA PDN The information of the information and RAB resources of connection bearing resource makes user equipment access target RAN.

A kind of method of data transfer, including：

Source RAN sends handover request message to target RAN, and RAB information to be set up is included in the handover request message Indicate with LIPA PDN connections are set up, it is described to set up LIPA PDN connections instruction for indicating the target RAN distribution LIPA PDN connects bearing resource, and the RAB information to be set up is used to indicate the target RAN distribution RAB resources；

The source RAN receives the handover request ack message that target RAN sends, in the handover request ack message Connect the information of the information and/or RAB resources of bearing resource comprising the LIPA PDN；

The source RAN by the LIPA PDN connect bearing resource information and/or RAB resources information send to User equipment, so that the user equipment connects the information and/or RAB resources of bearing resource according to the LIPA PDN Target RAN described in information access.

A kind of wireless access network RAN equipment, including：

Receiver module, for receiving the handover request message of source RAN transmissions, includes in the handover request message and waits to set up RAB RAB information and set up local IP access packet data network LIPA PDN connection indicate；

Processing module, the LIPA PDN that set up for being received according to the receiver module connect instruction, determine institute State whether RAN equipment is supported to ensure the switching of LIPA PDN business continuances；

Resource sets up module, if the determination result for the processing module is that RAN equipment is supported to ensure LIPA PDN The switching of business continuance, then according to it is described set up LIPA PDN connection instruction set up LIPAPDN connection bearing resource, according to institute State RAB information to be set up and set up RAB resources；

Sending module, for sending handover request ack message to the source RAN, wraps in the handover request ack message The information and the information of RAB resources of the LIPA PDN connection bearing resources of module assignment are set up containing the resource, so that described Source RAN connects the information of the information and RAB resources of bearing resource according to the LIPA PDN makes user equipment access the target RAN。

A kind of wireless access network equipment, including：

Sending module, for sending handover request message to target RAN, comprising to be set up in the handover request message RAB information and set up LIPA PDN connections and indicate, it is described to set up LIPA PDN connections and indicate for indicating target RAN distribution LIPA PDN connect bearing resource, and the RAB information to be set up is used to indicate the target RAN distribution RAB resources；

Receiver module, for receiving the handover request ack message that target RAN sends, the switching request response disappears Connect the information of the information and/or RAB resources of bearing resource in breath comprising the LIPA PDN；

The sending module, is additionally operable to the information and/or RAB resources of LIPA PDN connection bearing resources Information is sent to user equipment so that the user equipment according to the LIPA PDN connect bearing resource information and/ Or target RAN described in the information access of RAB resources.

A kind of communication system, including：Source RAN, target RAN and user equipment,

The source RAN includes to be set up for sending handover request message to target RAN, in the handover request message RAB information is indicated with LIPA PDN connections are set up；

For connecting instruction according to the LIPA PDN that set up for receiving, target RAN determines that target RAN is The no switching for supporting to ensure LIPA PDN business continuances；If target RAN is supported to ensure LIPA PDN business continuances Switching, then set up LIPA PDN connections and indicate distribution LIPA PDN connection bearing resource according to described, wait to set up according to described RAB information distribution RAB resources；If target RAN supports the switching for ensureing LIPA PDN business continuances, the mesh Mark RAN sets up LIPA PDN connection instruction distribution LIPA PDN connection bearing resources according to described, according to the RAB to be set up Information distributes RAB resources；Handover request ack message is sent to the source RAN, institute in the handover request ack message, is included State the information of the information and RAB resources of LIPA PDN connection bearing resources；

The source RAN is additionally operable to receive the handover request ack message that target RAN sends, the switching request response Connect the information of the information and/or RAB resources of bearing resource in message comprising the LIPA PDN；By the LIPA PDN The information of the information and/or RAB resources of connection bearing resource is sent to user equipment；

The user equipment is for the information and/or RAB resources according to LIPA PDN connection bearing resources Target RAN described in information access.

The technical scheme that the present embodiment is provided sets up LIPA PDN connection instructions due to what is included in handover request message, So that target RAN is after handover request message is received, determine whether target RAN is supported to ensure LIPA PDN business continuances Switching, it is determined that result support ensure LIPA PDN business continuances switching in the case of, set up LIPA PDN connection hold Resource is carried, therefore, it is possible to ensure that the connection bearing resources of the LIPA PDN in first radio resource control information are correct supports The bearing resource of LIPA PDN business continuances, can not support LIPA without carrying in first radio resource control information The bearing resource of PDN business continuances.

Description of the drawings

Fig. 1 is the schematic network structure of the communication system involved by the embodiment of the present invention；

Fig. 2 is schematic diagrams of the UE when cell switching is being carried out in communication system shown in Fig. 1；

Fig. 3 is a kind of schematic network structure of the communication system shown in Fig. 1 under LTE system；

Fig. 4 is a kind of schematic network structure of the communication system shown in Fig. 1 under 3G systems；

Fig. 5 is a kind of schematic network structure of the communication system shown in Fig. 1 under gprs system；

Fig. 6 is the flow chart of the method for the data transfer that invention one embodiment is provided；

Fig. 7 is the flow chart of the method for the data transfer that invention one embodiment is provided；

Fig. 8 is the flow chart of the method for the data transfer that invention one embodiment is provided；

Fig. 9 is the flow chart of the method for inventing the data transfer that another embodiment is provided；

Figure 10 is the structural representation of the RAN equipment that invention one embodiment is provided；

Figure 11 is the structural representation for inventing the RAN equipment that another embodiment is provided；

Figure 12 is the structural representation of the communication system that invention one embodiment is provided.

Specific embodiment

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

In order to preferably introduce the embodiment of the present invention, introduce data transfer provided in an embodiment of the present invention method it Before, first illustrate here and introduce some technology contents related to method provided in an embodiment of the present invention, but it should be clear that the skill Art content is exemplary, is optional for the embodiment of the present invention.

First, communication system architecture

Fig. 1 is refer to, Fig. 1 is the schematic network structure of the communication system involved by the embodiment of the present invention.The communication system System 10 includes L-GW11, wireless access network (Radio Access Network, RAN) 12, core net 13 and user equipment (User Equipment, UE) 14.By eating dishes without rice or wine to communicate with wireless access network 12, wireless access network 12 can be route and L- UE14 by IP GW11 communicates, and wireless access network 12 and L-GW11 are communicated with core net 13 respectively.It is emphasized that in order to realize LIPA PDN Ensure the switching of business continuance, L-GW11 is independent, can so realize that the wireless access network 12 of multiple cells passes through IP Route obtains communication connection with the L-GW11.Wherein, RAN12 can be HeNB or HNB.

Fig. 2 is refer to, Fig. 2 is schematic diagrams of the UE when cell switching is being carried out in communication system shown in Fig. 1.When UE14 is more When moving between individual cell, the UE is connected to same L-GW11 by the base station 12a～12d corresponding to each cell, by This ensures the seriality of LIPA PDN business.

Network system 10 shown in Fig. 1 can have various concrete implementation modes.

Fig. 3 is refer to, Fig. 3 is a kind of schematic network structure of the communication system shown in Fig. 1 under LTE system.Communication system System 30 includes L-GW31, HeNB32, gateway (Serving Gateway, SGW) 33, Mobility Management Entity (Mobility Management Entity, MME) 34 and UE35.UE35 is communicated with HeNB32 by Uu interfaces.Can be between multiple HeNB32 Communicated, or by the S1 interface communications without direct chain of command by the X2 interface for having direct chain of command.HeNB32 and L- Communicated by first interface Sxx between GW31, first interface Sxx can be the interface, or nothing for having direct chain of command The interface of direct chain of command.L-GW31 passes through S Gi interfaces and local network.L-GW31 is led to SGW33 by S5 interfaces Letter, HeNB32 are communicated with SGW33 by S1-U interface, and HeNB32 is communicated with MME34 by S1-MME interface.SGW33 and MME34 Between pass through S11 interface communications.Optionally, communication system 30 can also include HeNB gateways (Gateway, GW) and security gateway (SeGW, Security Gateway).

Fig. 4 is refer to, Fig. 4 is a kind of schematic network structure of the communication system shown in Fig. 1 under 3G systems.Communication system 40 include L-GW41, HNB42, SGW43, Serving GPRS Support Node (Serving GPRS Support Node, SGSN) 44, UE45 and HNB GW46.UE45 is communicated with HNB42 by Uu interfaces.Can be by there is direct chain of command between multiple HNB42 Lurh interface communications, or by the lu/luh interface communications without direct chain of command.By the between HNB42 and L-GW41 One interface Sxx communicates, and first interface Sxx can have the interface of direct chain of command, or connecing without direct chain of command Mouthful.L-GW41 passes through S Gi interfaces and local network.L-GW41 is communicated with SGW43 by S5 interfaces, and HNB42 passes through luh Interface is communicated with HNB GW46, and HNB GW46 are communicated with SGW43 by lu-UP interfaces, HNB GW46 by lu-CP interfaces with SGSN44 communicates.Pass through S4 interface communications between SGW43 and SGSN44.Optionally, communication system 40 can also include SeGW.

Fig. 5 is refer to, Fig. 5 is that (General Packet Radio Service lead to communication system shown in Fig. 1 in GPRS With packet wireless service) a kind of schematic network structure under system.Communication system 50 includes L-GW51, HNB52, HNB GW53, SGSN54 and UE55.UE55 is communicated with HNB52 by Uu interfaces.Can be by there is direct chain of command between multiple HNB52 Lurh interface communications, or by the lu/luh interface communications without direct chain of command.Pass through between HNB52 and L-GW51 First interface Sxx communicates, and first interface Sxx can have the interface of direct chain of command, or without direct chain of command Interface.L-GW51 passes through Gi interfaces and local network.Local network can be LAN.L-GW51 by gn interface with SGSN54 communicates, and HNB52 is communicated with HNB GW53 by luh interfaces, and HNB GW53 are communicated with SGSN54 by lu interfaces.It is optional , communication system 50 can also include SeGW.

2nd, RAN equipment

RAN, the such as HeNB or HNB of the local gateway that can support to be connected to independent, can preferably preserve L-GW companies Connect sexual intercourse table.Refer to table one, an example of the table one for L-GW connectivity relation tables.

Table one

The L-GW connectivity relation tables include several L-GW relations (L-GW Relation), i.e., one L-GW relation pair Answer the row in table one.Each L-GW relation record and this RAN route reachable by IP and can set up and be connected L-GW L-GW marks (ID) and/or home network identification.The L-GW ID include the L-GW titles (L-GW name), L-GW One or more in address (L-GW address), L-GW public network address (L-GWLN address).Meanwhile, the L-GW ID can also include the address (L-GW in the local gateway Internet Protocol Security tunnel set up between L-GW and this RAN IPsec transport layer address) and the L-GW user plane address.Wherein, the home network identification is referred to Native ip network or by source HeNB and the unique mark of source L-GW network consistings.L-GW public network address, L-GW and H (e) NB Between the address in IPsec tunnels set up and the user plane address of L-GW can be similar and different value.L-GW addresses The core net address of L-GW is referred to, which can be distributed by mobile network.The L-GW connectivities relation table can be existed by network management system RAN deployment, configure when starting, change being set, it is also possible to by the owner of RAN, manager manual configuration at any time, may be used also With the UPnP (Universal Plug and Play, UPnP) that supports by local network or DLNA (Digital Living Network Alliance, DLNA) technology obtained from L-GW or other relevant devices automatically by RAN Win the confidence.

The RAN can also preferably preserve adjacent cell list.Table two is refer to, table two is one of adjacent cell list and shows Example.

Table two

The adjacent cell list includes some neighbor cell relations (NR) item, i.e., the row in one NR items correspondence table two, often Individual NR items are used for the information for recording an adjacent cell.Specifically, the target in each NR item not only including the neighbor cell is little Area's mark, Physical Cell Identifier (PCI/PSC), and this cell whether have direct chain of command interface X2, also including the adjacent cell Whether RAN supports to be connected to independent L-GW, and the supported L-GW being connected to of RAN of the adjacent cell L-GW marks and/ Or the home network identification of the RAN and L-GW composition of the adjacent cell, such as L-GW address/names and L-GW public network address. Similar to connectivity relation table, the form can be configured in RAN deployment, startup, setting change by network management system, it is also possible to by The owner of RAN, manager manual configuration at any time, can with UPnP the or DLNA technologies supported by local network by RAN from after L-GW or other relevant devices acquisition information is generated or is updated automatically.

It should be pointed out that above-mentioned L-GW titles or home network identification, can be globally unique, mobile operator nets Network is globally unique or local network is unique.Above-mentioned L-GW addresses, L-GW public network address, the local IPsec tunnels of L-GW Track address, L-GW user planes address, can be by RAN is when L-GW connectivities relation table or adjacent cell list is generated or is setting up L- Before the interface of GW, with the L-GW name querys operator whole world, the mobile operator networks overall situation or local network domain server (DNSServer) obtain.Therefore, hereinafter RAN recognize or connect a L-GW when, it is possible to use local gateway title or Other L-GW ID.

3rd, UE sets up the process of LIPAPDN in cell-of-origin

There is the scene of direct chain of command in the interface Sxx of scene one, RAN12 and L-GW11.

Fig. 1 is refer to, optionally, RAN12 can be according to the local IPsec tunnels of L-GW in the L-GW connectivity relation tables The IPsec tunnels that one or more L-GW set up in address, with the L-GW connectivity relation tables.Optionally, IPsec tunnels also may be used To set up in subsequent steps.

When the UE14 with this RAN12 access authority initiates LIPAPDN after RAN12 is accessed to be connected, RAN12 inquiry L- The connectivity relation table of GW, if comprising the L- that one or more may be coupled in the connectivity relation table of the L-GW GW11, then RAN12 carry in the LIPA PDN connection establishment request messages for being sent to core net 13 this one or more can be even The L-GW ID of the L-GW being connected to.

After core net 13 receives the LIPA PDN connection establishment request messages of RAN12 transmissions, the signing, network according to UE is matched somebody with somebody Put and determine whether that receiving the LIPA PDN connection establishments asks with other strategies.If received, the L-GW for selecting RAN12 to send One in ID is carried as the L-GW11 for selecting, the PDN for setting up L-GW11.Core net 13 also sends carrying and sets up or assign Message includes dependency identification (Correlation ID), the dependency identification to RAN12, in the carrying foundation or assignment messages The mark in the uplink tunnel between as RAN12 and L-GW11.

Alternatively implementation, RAN12 also can ask disappear in the LIPA PDN connection establishments for being sent to core net 13 Home network identification is carried in breath, L-GW ID are parsed according to the home network identification by core net 13, one is selected as choosing Fixed L-GW11, and the L-GW ID of L-GW11 are issued in core net 13 sends and carries foundation or assignment messages to RAN12 RAN12。

RAN12 sends GPRS Tunnel Protocol chain of command agreement (GPRS to L-GW11 according to the public network address of L-GW Tunnelling Protocol, GTP) session establishment request message (Create Session Request) or agency movement The agent binding update messages (ProxyBinding Update) of IP agreement (Proxy Mobile IP, PMIP), request are set up The downlink data transmission tunnel of L-GW11 to RAN12.Carry descending in session establishment request message or agent binding update messages Transmission Tunnel Identifier, the downlink transfer Tunnel Identifier can be identical with the uplink Tunnel Identifier, i.e., with the dependency identification Identical, or RAN12 is UE14 distribution again.

After receiving session establishment message or agent binding update messages message, L-GW11 sends session establishment to RAN12 should Message (Create Session Response) or agent binding response message (Proxy Binding Acknowledge) are answered, Set up the transmitting uplink data tunnel of the LIPA PDN connections of the UE of RAN12 to L-GW11.

Above-mentioned message can be sent in the IPsec tunnels of RAN12 to the L-GW11 having built up before.If do not had before Set up IPsec tunnels, it is also possible to before sending session establishment request message or agent binding update messages, by RAN12 according to The local IPsec tunnel address of L-GW sends the request of IPsec tunnel buildings to L-GW11, sets up IPsec tunnels.Treat IPsec tunnels After road is set up, then above-mentioned message is sent in IPsec tunnels.

The interface (Sxx) of scene two, RAN12 and L-GW11 only exists user plane, i.e., the scene without direct chain of command.

Scene two is essentially identical with scene one, and difference is essentially consisted in：RAN12 is also needed to the public network address of RAN12 Or IPsec tunnel address issues core net 13, by core net 13 by the public network address of the RAN12 or IPsec tunnel address Issue L-GW11.Similar, L-GW11 also needs to for the public network address of L-GW11 or IPsec tunnel address to issue core net 13, the public network address of the L-GW11 or IPsec tunnel address are issued into RAN12 by core net 13.RAN12 and L-GW11 exist After receiving the public network address or IPsec tunnel address of other side, LIPA PDN up-downgoings are sent to other side by IPsec tunnels Data.

Fig. 6 is refer to, Fig. 6 is the flow chart of the method for the data transfer that invention one embodiment is provided.The method can be with It is applied under the scene of cell switching.The method includes：

S61, target RAN are received source RAN sends or source RAN and are disappeared by the handover request that Mobility Management Entity sends Breath, includes RAB RAB information to be set up and sets up local IP access grouped data in the handover request message Network LIPA PDN connections are indicated.

S62, target RAN connect instruction according to the LIPA PDN that set up for receiving, and determine that target RAN is The no switching for supporting to ensure LIPAPDN business continuances.

If S63, target RAN support ensure LIPA PDN business continuances switching, target RAN according to It is described to set up LIPA PDN connection instructions and set up LIPA PDN connection bearing resources, set up according to the RAB information to be set up RAB resources, and bearing resource and RAB resources the first radio resource control information of formation are connected according to LIPA PDN.

S64, target RAN are sent to the source RAN or are sent out to the source RAN by the Mobility Management Entity Handover request ack message is sent, first radio resource control information in the handover request ack message, is included, so that The source RAN makes user equipment access target RAN according to first radio resource control information.

In the middle of the present embodiment, RAN can be HeNB, HNB, eNB or RNC.Mobility Management Entity can be MME, also Can be SGSN.

The method of the present embodiment is set up after LIPA PDN connection instructions, really due to what is included in handover request message is received Whether fixed target RAN supports the switching for ensureing LIPA PDN business continuances, it is determined that result is supported to ensure LIPAPDN industry It is engaged in, in the case of successional switching, setting up LIPAPDN connection bearing resources, therefore, it is possible to ensure first wireless heterogeneous networks LIPA PDN connection bearing resources in message are the bearing resources for correctly supporting LIPA PDN business continuances, without at this The bearing resource that can not support LIPA PDN business continuances is carried in first radio resource control information.

Fig. 7 is refer to, Fig. 7 is the flow chart of the method for the data transfer that invention one embodiment is provided.The method can be with It is applied under the scene of cell switching.The method includes：

S71, source RAN send to target RAN or send handover request to target RAN by Mobility Management Entity Message, indicates with LIPA PDN connections are set up comprising RAB information to be set up in the handover request message, described to set up LIPA PDN connections indicate that the RAB information to be set up is used for indicating that target RAN sets up LIPA PDN connection bearing resources RAB resources are set up in instruction target RAN.

S72, the source RAN are received that target RAN sends or are received target RAN by mobile management reality The handover request ack message that body sends, includes radio resource control information in the handover request ack message, described wireless Resource Control Message is formed according to the LIPA PDN connection bearing resources and/or RAB resources set up.

S73, the source RAN send the radio resource control information to user equipment, so that the user equipment root Target RAN is accessed according to the radio resource control information.

The method of the present embodiment is set up LIPA PDN connections and is referred to as source RAN is contained in the handover request message for sending Show, therefore target RAN can be allowd LIPA PDN connection instructions to be set up according to this and set up corresponding LIPA PDN connection hold Resource is carried, and then ensure that the switching of LIPA PDN business continuances.

Fig. 8 is refer to, Fig. 8 is the flow chart of the method for the data transfer that invention one embodiment is provided.The present embodiment is Fig. 3 and Fig. 8 is referred in the lump, is illustrated as a example by having direct chain of command interface by LTE system and between RAN, i.e., have between HeNB There is X2 interface.The method includes：

S801, preferred, UE is to source HeNB reporting measurement reports.

S802, preferred, source HeNB selects what is will switched according to default adjacent cell list and the measurement report Target HeNB, the L-GW marks comprising adjacent cell HeNB for supporting connection L-GW or local network mark in the adjacent cell list Know.

After source HeNB determines that UE needs switching cell, due to having LIPA PDN empty port load-supportings between the UE and source HeNB, Also due to having LIPA PDN RABs (Radio Access between the connected source L-GW of source HeNB Bearer, RAB), therefore source HeNB not only needs according to the measurement report to select, in addition it is also necessary to root in selection target cell According to the default adjacent cell lists of source HeNB, the HeNB of selection target cell may be coupled to source L-GW as far as possible.Here, source L-GW The L-GW connected by the source HeNB of referring to.

S803, source HeNB send handover request message (Handover Request), the handover request to target HeNB In message comprising RAB information to be set up and set up LIPA PDN connection indicate, it is described set up LIPA PDN connection instruction be used for Indicate that target HeNB sets up LIPA PDN connection bearing resources, the RAB information to be set up is used to indicate the target HeNB sets up RAB resources.

In the present embodiment, set up LIPA PDN connections to indicate as a newly-increased parameter, positioned at the RAB to be set up Outside information.

In the present embodiment, this is set up LIPA PDN connections and indicates the L-GW ID comprising source L-GW, local network mark In knowledge, the LIPA PDN empty port load-supporting information of source HeNB, the LIPA PDN RAB information of source HeNB any one or it is multiple. The L-GW ID can include the local IPsec tunnels ground of L-GW titles, L-GW core net address, L-GW public network address, L-GW In location, L-GW user planes address any one or it is multiple.Certainly, as other implementation, target HeNB also can use, L-GW titles or, L-GW cores net address obtain L-GW local networks ground to local dns Server or other object queries Location, the local IPsec tunnel address of L-GW etc..

S804, target HeNB connect instruction according to the LIPA PDN that set up for receiving, and determine the target Whether HeNB supports the switching for ensureing LIPA PDN business continuances.

As preferred implementation, target HeNB according to receive this set up LIPA PDN connections and indicate, can be by The switching for oneself whether supporting to ensure LIPA PDN business continuances is judged according to following method：

The first step, judges whether target HeNB is supported to be connected to L-GW.If target HeNB is not supported to be connected to L- GW, that is, represent and do not support that LIPA PDN connect, then understand that target HeNB is not supported to ensure cutting for LIPA PDN business continuances Change.If target HeNB is supported to be connected to L-GW, also need to proceed following second step judgement.

Second step, the L-GW whether in determining the L-GW connectivity relation tables that target HeNB is pre-saved with source L-GW ID or home network identification, in the L-GW connectivity relation tables, in store target HeNB supports the L-GW of the L-GW being connected to ID or home network identification.If support is recorded in L-GW connectivity relation tables is connected to source L-GW, the target is understood HeNB supports the switching for ensureing LIPA PDN business continuances.If not recording source L-GW's in L-GW connectivity relation tables Relevant information or record are not supported to be connected to source L-GW, then also need to proceed following the 3rd step judgement.

3rd step, judges whether target HeNB is supported to be connected to source L-GW.Target HeNB can preferably be used The L-GW ID of the source L-GW set up during LIPA PDN connections are indicated, attempt connection source L-GW.If target HeNB is not propped up Hold and be connected to source L-GW, that is, illustrate that the L-GW can not be connected to source L-GW by IP routes, then understand target HeNB not Support to ensure the switching of LIPA PDN business continuances.If target HeNB is supported to be connected to source L-GW, the mesh is understood Mark HeNB supports the switching for ensureing LIPA PDN business continuances.

Certainly, as another kind of implementation, target HeNB can also only carry out the judgement of the 3rd step, if the i.e. target HeNB does not support to be connected to source L-GW, then understand that target HeNB is not supported to ensure the switching of LIPA PDN business continuances. If target HeNB is supported to be connected to source L-GW, understand that target HeNB is supported to ensure LIPA PDN business continuances Switching.

If S805, target HeNB support the switching for ensureing LIPA PDN business continuances, target HeNB According to it is described set up LIPA PDN connection instruction set up LIPA PDN connection bearing resource, according to the RAB information to be set up RAB resources are set up, and bearing resource and RAB resources the first radio resource control information of formation are connected according to LIPA PDN.

Preferably, the LIPA PDN connection bearing resources include LIPA PDN empty port load-supportings resources and LIPA PDN RAB moneys Source.LIPA PDN empty port load-supporting resources refer to the carrying between UE to HeNB, and LIPA PDN RAB are referred between HeNB to SGW Carrying.Target HeNB according to this set up LIPA PDN connection indicate in source HeNB LIPA PDN empty port load-supportings information come The LIPA PDN empty port load-supporting resources of target side are set up, target HeNB is set up according to the LIPA PDN RAB information of source HeNB LIPA PDN RAB resources.The RAB resources refer to other RAB resources outside LIPAPDN connection bearing resources.

Explanation is needed exist for, HeNB can include redaction HeNB and early version HeNB.Redaction HeNB can be known This is not set up LIPA PDN connections and indicates, and redaction HeNB is also connected to the HeNB of L-GW including support and does not support to be connected to The HeNB of L-GW.And early version HeNB does not only support to be connected to L-GW, nor the foundation as newly-increased parameter can be recognized LIPA PDN connections are indicated.Therefore, early version HeNB after the handover request message is received can ignore this and set up LIPA PDN Connection indicates, also will not set up LIPA PDN connection instructions according to this and set up any LIPA PDN connections bearing resource.And if This is set up LIPA PDN connections to indicate to be put in the RAB information of foundation, then early version HeNB is possible to according to the foundation LIPA PDN connections indicate the LIPA PDN connection bearing resources for setting up mistake.

Target HeNB forms the first Radio Resource control according to the LIPA PDN connection bearing resources and RAB resources set up Message processed.First radio resource control information can be wireless resource control connection reconfiguration (RRC Connection Reconfiguration) message, first radio resource control information include that the LIPA PDN connections set up carry money The information of the information and RAB resources in source.

It is S806, optional, if target HeNB supports the switching for ensureing LIPA PDN business continuances, the mesh Mark HeNB always according to it is described set up LIPA PDN connection indicate set up IPsec tunnels with the source L-GW.

Target HeNB can set up IPsec with source L-GW according to the local IPsec tunnel address of the L-GW of source L-GW Tunnel.It should be pointed out that first, S806 can be carried out parallel with S805；Second, S86 be able to wouldn't be performed with here, as long as ensureing Perform before follow-up S11.

S807, target HeNB send handover request ack message to the source HeNB, and the switching request response disappears First radio resource control information is included in breath, so that the source HeNB is according to first radio resource control information UE is made to access target HeNB.

In an implementation of the present embodiment, the handover request ack message can be specifically handover request response (Handover Request Acknowledge) message.Due to no direct chain of command interface between target HeNB and UE, Therefore to the handover request ack message that source HeNB sends, target HeNB includes that target HeNB is transparent to source HeNB Container (Target HeNB To Source HeNB Transparent Container), the transparent vessel are used for comprising the mesh Mark HeNB needs to be sent to the message of UE.In this implementation, the transparent vessel includes switching command (Handover Command), first radio resource control information is included in the switching command.Optionally, in the handover request ack message Also comprising closing property mark, the i.e. mark in the uplink tunnel between target HeNB and source L-GW.

Preferably, also support to indicate comprising switching in the handover request ack message.The switching is supported to indicate for indicating Whether target HeNB supports the switching for ensureing LIPA PDN business continuances.Optionally, switching is supported to indicate to include first Indicate, second indicate and the 3rd indicate in any one or it is multiple, wherein, described first indicates for indicating the target Whether HeNB supports the local gateway mark for being connected to local gateway and/or the local gateway being connectable to, and described second refers to Show that the described 3rd indicates for indicating the mesh for indicating whether target HeNB is supported to be connected to the source local gateway Whether mark HeNB has built up LIPA PDN connection bearing resources.

It is S805 ', optional, if target HeNB does not support the switching for ensureing LIPA PDN business continuances, institute State target HeNB and RAB resources are set up according to the RAB information to be set up, and the second nothing is formed according to the RAB resources set up Line Resource Control Message.

S807 ', optional, target HeNB sends handover request ack message to the source HeNB, and the switching please Second radio resource control information is included in seeking response message, so that the source HeNB is according to second Radio Resource Control message makes UE access target HeNB.

If it should be pointed out that target HeNB do not support ensure LIPA PDN business continuances switching, according to Above description understands that S805～S807 will be not carried out, and the substitute is S805 ' and S807 ' will be performed.

In the present embodiment, in order to simplify description, target HeNB is only introduced below and supports to ensure LIPAPDN business The situation of successional switching.

S808, source HeNB send switching command to UE, and first radio resource control information is included in the switching command.

S809, UE access target HeNB according to first radio resource control information.

The LIPA PDN empty port load-supporting resource informations that UE includes according to first radio resource control information, access the mesh Mark HeNB, completes the foundation of the LIPA PDN empty port load-supportings between target HeNB so that the LIPA upstream datas bag of UE can be with Send to target HeNB.

After S810, user equipment access target HeNB, LIPA upstream data bags are sent to target HeNB.

S811, target HeNB send the LIPA upstream data bag to the source L-GW by the IPsec tunnels, Uplink Tunnel Identifier is included in the LIPA upstream datas bag.

S812, target HeNB send the request of downlink transfer tunnel building to the source L-GW；

, after the LIPA upstream data bags for receiving UE, target HeNB sends session establishment to source L-GW please for target HeNB Message or agent binding update messages are asked, and source L-GW are set up to the downlink data transmission tunnel of target HeNB.

S813, the source L-GW send LIPA downlink data packets to the source HeNB, wrap in the LIPA downlink data packets The end mark asked according to the downlink transfer tunnel building containing the source L-GW and added, the end mark are used to indicate The LIPA downlink data packets are last LIPA downlink data packet that the source L-GW is sent to the source HeNB.

S814, the source HeNB survey HeNB to the target and forward the LIPA downlink data packets with end mark.

S815, target HeNB begin through the IPsec tunnels and receive the source L-GW according to the end mark The LIPA downlink data packets of transmission, include downlink transfer Tunnel Identifier in the LIPA downlink data packets.

Optionally, the downlink transfer Tunnel Identifier is identical with the uplink Tunnel Identifier, or the downlink transfer tunnel Set up.

It is S816, optional, if target HeNB is through being determined to be connected to the source local gateway, the mesh Mark HeNB also adds the local gateway mark of the source local gateway in the local gateway connectivity relation table.

It is S817, optional, if supporting to indicate comprising the switching in the switching response message, according to the switching Support to indicate to update the adjacent cell list.

The method provided by the present embodiment is indicated as a newly-increased parameter due to will set up LIPA PDN connections, is located at Outside the RAB information to be set up, rather than this is set up LIPA PDN connections and indicates to be put in the RAB information of foundation, therefore can To avoid early version HeNB from being possible to be carried according to the LIPA PDN connections for setting up LIPA PDN connection instruction foundation mistakes Resource, and then allow UE that LIPA PDN successful connections are switched to target HeNB.

Fig. 9 is refer to, Fig. 9 is the flow chart of the method for inventing the data transfer that another embodiment is provided.The method with Corresponding to Fig. 8, method is substantially the same, and differs primarily in that the transmission tunnel set up between target HeNB and source L-GW is different.Specifically For, the method includes：

S901～S910 is identical with S801～S810 respectively.

S911, target HeNB touching according to the LIPA upstream data bags in the access request or S910 in S909 Send out, the two-way IPsec tunnels of UE granularities are set up with the source local gateway.

S912, target HeNB send described to the source L-GW by the two-way IPsec tunnels of the UE granularities LIPA upstream data bags.

S913, the source L-GW send LIPA downlink data packets to the source HeNB, wrap in the LIPA downlink data packets Containing the end mark that the source L-GW is added after the two-way IPsec tunnel buildings success, the end mark is used to indicate The LIPA downlink data packets are last LIPA downlink data packet that the source L-GW is sent to the source HeNB.

S914, the source HeNB survey HeNB to the target and forward the LIPA downlink data packets with end mark.

S915, target HeNB begin through the IPsec tunnels and receive the source L-GW according to the end mark The LIPA downlink data packets of transmission.

S915 and S916 are identical with S815 and S816 respectively.

The method of the data transfer that another embodiment of the invention is provided is described below.The method of the present embodiment and Fig. 8 or Method corresponding to person Fig. 9 is essentially identical, differs primarily in that：

The operation of the method correspondence S803 or S903 of the present embodiment is changed into：Set up LIPA PDN connection indicate not as One newly-increased parameter, outside the RAB information to be set up, and builds if this being set up LIPA PDN connection instructions and being put into In vertical RAB information.

The method of the present embodiment also includes between correspondence S807 and S808 or between S907 and S908：

Whether support to indicate comprising switching in judging the switching response message, the switching is supported to indicate for indicating institute State whether target HeNB is supported to ensure the switching of LIPA PDN business continuances.

If supporting to indicate not comprising the switching in the switching response message, judge that the wireless heterogeneous networks disappear Whether bearing resource is connected comprising LIPA PDN in breath；

If connecting bearing resource comprising LIPA PDN in the radio resource control information, the LIPA PDN are connected Bearing resource deletion is connect, the radio resource control information corrected is obtained；

The source HeNB sends the radio resource control information to user equipment, so that the user equipment root Target HeNB is accessed according to the radio resource control information includes：

The source HeNB sends the radio resource control information of the amendment to user equipment, so that the user equipment Target HeNB is accessed according to the radio resource control information of the amendment.

Specifically, according to description before, it is put in the RAB information of foundation as early version HeNB is possible to basis This is set up LIPA PDN connections and indicates, sets up the LIPA PDN connection bearing resources of mistake.Therefore, first determine whether that the switching rings Whether support to indicate comprising switching in answering message, if supporting to indicate comprising switching, illustrate that target HeNB is redaction HeNB. If supporting to indicate not comprising switching, illustrate that target HeNB is early version HeNB.In the feelings that target HeNB is early version HeNB Under condition, whether source HeNB connects bearing resource comprising LIPA PDN in needing to determine whether radio resource control information, if Connect bearing resource comprising LIPA PDN, then illustrate that target HeNB of the early version establishes the LIPA PDN connections of mistake and carries Resource, needs to delete, therefore LIPA PDN connection bearing resources are deleted, and obtains the radio resource control information corrected.

Although above-described embodiment is illustrated as a example by having direct chain of command interface between RAN, above-described embodiment The method for being provided can be applied equally to the situation without direct chain of command interface between RAN, such as be S1 interfaces between HeNB.

For, in the case of S1 interfaces, the message sent between source HeNB and target HeNB is forwarded by MME between HeNB, I.e. source HeNB first sends a message to MME, and the message is forwarded to target HeNB by MME then, and vice versa.

In addition, though above-described embodiment is illustrated by taking LTE system as an example, but the method provided by above-described embodiment Can be applied equally in the middle of other communication systems such as 3G systems, gprs system.For 3G or gprs system, RAN is HNB, Mobility Management Entity are SGSN.

In addition, the message sent between each network element in above-described embodiment and data can be directly transmit, or Forward through other network elements.For example, for LTE system, if user is only existed with the interface Sxx of source L-GW in target HeNB In the case that face is without direct chain of command, target HeNB will include the public network address or IPsec tunnels ground of target HeNB MME is issued in the downlink transfer tunnel building request of location, and MME is passed through SGW again and issues source L-GW.Similar, source L-GW is also The public network address of the L-GW or IPsec tunnel address are issued into MME by SGW, MME is issued HeNB again.For 3G System, if in the case where the interface Sxx of target HNB and source L-GW only exists user plane without direct chain of command, mesh The downlink transfer tunnel building request of the public network address comprising target HNB or IPsec tunnel address is issued by mark HNB SGSN, SGSN are passed through SGW again and are issued source L-GW.It is similar, source L-GW also by the public network address of the L-GW or IPsec tunnel address issues SGSN by SGW, and SGSN is issued HNB again.The system situations such as GPRS are similar to, and repeat no more.

Figure 10 is refer to, Figure 10 is the structural representation of the RAN equipment that invention one embodiment is provided.The RAN equipment 100 Method for performing the embodiment of the present invention, RAN equipment 100 include：

Receiver module 101, for receiving the handover request message of source RAN transmissions, includes in the handover request message and treats The RAB RAB information of foundation is indicated with local IP access packet data network LIPA PDN connections are set up；

Processing module 102, the LIPA PDN that set up for being received according to the receiver module 101 connect instruction, Determine whether the RAN equipment is supported to ensure the switching of LIPA PDN business continuances；

Resource sets up module 103, if the determination result for the processing module 102 is that RAN equipment is supported to ensure The switching of LIPA PDN business continuances, then according to it is described set up LIPA PDN connection instruction set up LIPA PDN connection carry money Source, sets up RAB resources according to the RAB information to be set up；

Sending module 104, for sending handover request ack message, the handover request ack message to the source RAN In comprising the resource set up module 103 distribution LIPA PDN connection bearing resource information and RAB resources information so that The information for obtaining information and RAB resources that the source RAN connects bearing resource according to the LIPA PDN makes user equipment access institute State target RAN.

In another embodiment, resource sets up module 103, if the determination result for being additionally operable to the processing module is The RAN equipment does not support the switching for ensureing LIPA PDN business continuances, then set up according to the RAB information to be set up RAB resources；

The sending module 104, is additionally operable to send handover request ack message to the source RAN, and the handover request is rung The information comprising the RAB resources in message is answered, so that the source RAN makes user equipment according to the information of the RAB resources Access target RAN.

In another embodiment, processing module 102, specifically for building described in being received according to the receiver module Vertical LIPA PDN connections instruction, determines whether target RAN is supported to be connected to the source local gateway.

In another embodiment, receiver module 101, specifically for receiving the handover request message that source RAN sends, institute RAB RAB information to be set up is included in stating handover request message and local IP access packet data network is set up LIPA PDN connections indicate that the local gateway for including the source local gateway during LIPA PDN connections are indicated of setting up is identified And/or home network identification；

Processing module 102, the local gateway mark of the local gateway specifically for being received according to the receiver module Know, determine whether target RAN is supported to ensure the switching of LIPA PDN business continuances；Or

Processing module 102, the local network mark of the local gateway specifically for being received according to the receiver module Know the local gateway mark for obtaining local gateway, determine whether target RAN is supported to ensure according to local gateway mark The switching of LIPA PDN business continuances.

In another embodiment, receiver module 102, specifically for receiving the handover request message that source RAN sends, institute RAB RAB information to be set up is included in stating handover request message and local IP access packet data network is set up LIPA PDN connections indicate that the local gateway for including the source local gateway during LIPA PDN connections are indicated of setting up is identified And/or home network identification, the local gateway is identified includes local gateway title, local gateway core net address, LAN Close public network address, the local Internet Protocol Security tunnel address of local gateway, appointing in local gateway user plane address Anticipate one or more.

In another embodiment, the sending module 104, specifically for sending to the source RAN or passing through institute Stating Mobility Management Entity and handover request ack message being sent to the source RAN, institute is included in the handover request ack message The first radio resource control information is stated, so that the source RAN makes user equipment according to first radio resource control information Target RAN is accessed, also supports to indicate comprising switching in the handover request ack message, the switching supports that instruction is used for Indicate whether target RAN is supported to ensure the switching of LIPA PDN business continuances.

In another embodiment, the sending module 104, specifically for sending to the source RAN or passing through institute Stating Mobility Management Entity and handover request ack message being sent to the source RAN, institute is included in the handover request ack message The first radio resource control information is stated, so that the source RAN makes user equipment according to first radio resource control information Target RAN is accessed, also supports to indicate comprising switching in the handover request ack message, the switching supports that instruction is used for Indicate whether target RAN supports to ensure the switching of LIPAPDN business continuances that the switching is supported to indicate to include the first finger Show and any one in the second instruction or multiple, wherein, described first indicates for indicating whether target RAN is supported The source local gateway is connected to, described second indicates whether the allocated LIPAPDN connections are held for indicating target RAN Carry resource.

In another embodiment, the RAN equipment 100 also includes tunnel building module 105, if for the process The determination result of module is that the RAN equipment is supported to ensure the switching of LIPA PDN business continuances, then according to the foundation LIPA PDN connections indicate to set up Internet Protocol Security tunnel with the source local gateway.

In another embodiment, the RAN equipment 100 also includes data processing module 106, for by the reception Module receives the LIPA upstream data bags sent after the user equipment is accessed, and for passing through described by the sending module Internet Protocol Security tunnel sends the LIPA upstream datas bag, the LIPA upstream datas bag to the source local gateway In include uplink Tunnel Identifier.

In another embodiment, the tunnel building module 106, is additionally operable to receiving the data processing module After the 102 LIPA upstream datas bags for receiving, descending biography is sent to the source local gateway by the sending module 104 Defeated tunnel building request；

The data processing module is additionally operable to receive the LIPA downlink datas that the source RAN sends by the receiver module Bag, asks according to the downlink transfer tunnel building and adds comprising the source local gateway in the LIPA downlink data packets End mark, the end mark are used to indicate that the LIPA downlink data packets are sent to the source RAN for the local gateway Last LIPA downlink data packet；With

For according to the end mark, starting to control the receiver module by the Internet Protocol Security tunnel The LIPA downlink data packets that the source local gateway sends are received, downlink transfer tunnel mark in the LIPA downlink data packets, is included Know.

In another embodiment, the receiver module is additionally operable to receive the user equipment according to the LIPA PDN Access request or receive the LIPA upstream data bags that the user equipment sends that the information of connection bearing resource sends；Tunnel It is triggering for the access request or LIPA upstream data bags for being received by the receiver module to set up module 105, The two-way Internet protocol safety tunnel of UE granularities is set up with the source local gateway.

In another embodiment, data processing module 106 is for controlling the sending module by described two-way Internet Protocol Security tunnel receives the LIPA downlink data packets that the source RAN sends, and wraps in the LIPA downlink data packets Containing the end mark that the source local gateway is added after the two-way Internet protocol safety tunnel building success, the knot Beam labelling is used to indicate that the LIPA downlink data packets are last LIPA downlink data packet that the source RAN sends；With with Start to receive LIPA downlink data packets from the source local gateway in the receiver module according to the end mark, is controlled.

Figure 11 is refer to, Figure 11 is the structural representation of the RAN equipment that invention one embodiment is provided.The RAN equipment 110 Method for performing the embodiment of the present invention, RAN equipment 110 include：

Sending module 111, for sending handover request message to target RAN, comprising yet to be built in the handover request message Vertical RAB information and set up LIPA PDN connections and indicate, it is described to set up LIPA PDN connections and indicate for indicating target RAN Distribution LIPA PDN connection bearing resources, the RAB information to be set up are used to indicate the target RAN distribution RAB resources；

Receiver module 112, for receiving the handover request ack message that target RAN sends, the handover request is rung Connect the information of the information and/or RAB resources of bearing resource in answering message comprising the LIPA PDN；

The sending module 111, is additionally operable to the LIPA PDN are connected the information and/or RAB money of bearing resource The information in source is sent to user equipment, so that the user equipment connects the information of bearing resource according to the LIPA PDN And/or target RAN described in the information access of RAB resources.

In another embodiment, the sending module 111 specifically for, to target RAN send handover request message, Indicate with LIPA PDN connections are set up comprising RAB information to be set up in the handover request message, it is described to set up LIPA PDN Connection indicates that for indicating the target RAN distribution LIPA PDN connection bearing resources RAB information to be set up is used to refer to Show target RAN distribution RAB resources, it is described to set up LIPA PDN connections and indicate to be included in RAB information to be set up；

The RAN equipment also includes：Message processing module 113, for judging the switching that the receiver module is received Whether support to indicate comprising switching in response message, the switching is supported to indicate for indicating whether target RAN is supported to protect The switching of card LIPA PDN business continuances；If supporting to indicate not comprising the switching in the switching response message, sentence Whether the information of bearing resource is connected comprising LIPAPDN in the disconnected radio resource control information；If the Radio Resource control Connect the information of bearing resource in message processed comprising LIPA PDN, then the information that the LIPA PDN connect bearing resource is deleted Remove；The information of the RAB resources is sent to user equipment by the sending module, so that the user equipment is according to described Target RAN described in the information access of RAB resources.

In another embodiment, the sending module 111, specifically for sending handover request message to target RAN, Indicate with LIPA PDN connections are set up comprising RAB information to be set up in the handover request message, it is described to set up LIPA PDN Connection indicates that for indicating the target RAN distribution LIPA PDN connection bearing resources RAB information to be set up is used to refer to Show the target RAN distribution RAB resources, it is described to set up the LAN comprising the source local gateway during LIPA PDN connections are indicated Close mark and/or home network identification, local gateway mark include local gateway title, local gateway core net address, The local Internet Protocol Security tunnel address of local gateway public network address, local gateway, local gateway user plane address In any one or it is multiple.

In another embodiment, the RAN equipment also includes：Data processing module 114, for by the reception Module receives the LIPA downlink data packets that the source local gateway sends, and end mark is included in the downlink data packet, described End mark is that the end mark is used to indicate that the downlink data packet is last downlink data packet for being sent to source RAN； Downlink data packet comprising the end mark is transmitted to by target RAN by the sending module, so that the target RAN starts to receive the downlink data that the source local gateway sends

Figure 12 is refer to, Figure 12 is the structural representation of the communication system that invention one embodiment is provided.The communication system 120 are used for the method that performs the embodiment of the present invention, and the communication system 120 includes：Source RAN121, target RAN122 and user equipment 123,

The source RAN121 is included for sending handover request message to target RAN122, in the handover request message and is treated The RAB information of foundation is indicated with LIPA PDN connections are set up；

Target RAN122 determines the target for connecting instruction according to the LIPA PDN that set up for receiving Whether RAN122 supports the switching for ensureing LIPA PDN business continuances；If target RAN122 is supported to ensure LIPA PDN The switching of business continuance, then set up LIPA PDN connection instruction distribution LIPA PDN connection bearing resources according to described, according to The RAB information distribution RAB resources to be set up；If target RAN122 is supported to ensure LIPA PDN business continuances Switch, then target RAN122 sets up LIPA PDN connection instruction distribution LIPA PDN connection bearing resources, root according to described According to the RAB information distribution RAB resources to be set up；Handover request ack message, the switching are sent to the source RAN121 Connect the information of the information and RAB resources of bearing resource in request response comprising the LIPA PDN；

The source RAN121 is additionally operable to receive the handover request ack message that target RAN122 sends, and the switching please Connect the information of the information and/or RAB resources of bearing resource in seeking response message comprising the LIPA PDN；Will be described The information of the information and/or RAB resources of LIPA PDN connection bearing resources is sent to user equipment；

The user equipment 123 is for the information and/or RAB resources according to LIPA PDN connection bearing resources Information access described in target RAN122.

In another embodiment, the communication system 120 also includes local gateway 124,

If target RAN122 is additionally operable to target RAN122 to support to ensure cutting for LIPA PDN business continuances Change, then target RAN122 according to it is described set up LIPA PDN connection indicate with the local gateway set up Internet Protocol peace Full property tunnel；

The user equipment 123 is additionally operable to the LIPA sent to target RAN122 after target RAN122 is accessed Upstream data bag；

Target RAN122 is additionally operable to send institute to the local gateway by the Internet Protocol Security tunnel LIPA upstream datas bag and the request of downlink transfer tunnel building are stated, uplink tunnel mark in the LIPA upstream datas bag, is included Know；

The LAN 124 is closed for sending LIPA downlink data packets, the LIPA downlink datas to the source RAN121 The end mark asked according to the downlink transfer tunnel building and added comprising the local gateway in bag, the end mark For indicating that the LIPA downlink data packets are last LIPA downlink data that the local gateway is sent to the source RAN Bag；

The source RAN121 is additionally operable to receive the LIPA downlink data packets, and the LIPA downlink data packets are transmitted to Target RAN122；

Target RAN122 is additionally operable to receive the LIPA downlink data packets that the source RAN121 sends, according to described End mark, begins through the Internet Protocol Security tunnel and receives the LIPA downlink datas that the source local gateway sends Bag.

It is last it should be noted that one of ordinary skill in the art will appreciate that whole in realizing above-described embodiment method Or part flow process, can be by computer program to instruct the hardware of correlation to complete, described program can be stored in a meter In calculation machine read/write memory medium, the program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein, institute The storage medium stated can be magnetic disc, CD, read-only memory (ROM) or random access memory (RAM) etc..

During each functional unit in the embodiment of the present invention can be integrated in a processing module, or unit list Solely it is physically present, it is also possible to which two or more units are integrated in a module.Above-mentioned integrated module can both be adopted The form of hardware is realized, it would however also be possible to employ the form of software function module is realized.If the integrated module is with software function The form of module is realized and as when independent production marketing or use, it is also possible to is stored in an embodied on computer readable storage and is situated between In matter.Storage medium mentioned above can be read only memory, disk or CD etc..Above-mentioned each device or system, can be with Perform the method in correlation method embodiment.

The foregoing is only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.

Claims

1. a kind of method of data transfer, it is characterised in that include：

Target radio access network RAN receives the handover request message that source RAN sends, and includes and wait to set up in the handover request message RAB RAB information and set up local IP access packet data network LIPA PDN connection indicate；

Target RAN connects instruction according to the LIPA PDN that set up for receiving, and determines whether target RAN is supported to protect The switching of card LIPA PDN business continuances；

If target RAN supports the switching for ensureing LIPA PDN business continuances, target RAN is according to the foundation LIPA PDN connections indicate distribution LIPA PDN connection bearing resources, according to the RAB information distribution RAB resources to be set up；

Target RAN sends handover request ack message to the source RAN, comprising described in the handover request ack message The information of the information and RAB resources of LIPA PDN connection bearing resources, so that the source RAN connects according to the LIPA PDN The information of the information and RAB resources of bearing resource makes user equipment access target RAN, wherein, the switching request response Also support to indicate comprising switching in message, the switching is supported to indicate for indicating whether target RAN is supported to ensure LIPA The switching of PDN business continuances, the switching support to indicate to include the first instruction that described first indicates for indicating the target Whether RAN supports to be connected to source local gateway.

2. the method for claim 1, it is characterised in that methods described also includes：

If target RAN does not support that the switching for ensureing LIPA PDN business continuances, target RAN are treated according to described The RAB information distribution RAB resources of foundation；

Target RAN sends handover request ack message to the source RAN, comprising described in the handover request ack message The information of RAB resources, so that the source RAN makes user equipment access target RAN according to the information of the RAB resources.

3. the method for claim 1, it is characterised in that whether determination target RAN is supported to ensure LIPA The switching of the business continuance of PDN connections includes：

Determine whether target RAN is supported to be connected to the source local gateway.

4. the method for claim 1, it is characterised in that described to set up during LIPA PDN connections are indicated comprising the source sheet The local gateway mark of ground gateway and/or home network identification；

Target RAN connects instruction according to the LIPA PDN that set up for receiving, and determines whether target RAN is supported Ensure that the switching of LIPA PDN business continuances is specifically included：

Target RAN is identified according to the local gateway of the source local gateway for receiving, and determines whether target RAN props up Hold the switching for ensureing LIPA PDN business continuances；Or

Target RAN obtains the sheet of the source local gateway according to the home network identification of the source local gateway for receiving According to the local gateway of source local gateway mark, ground gateway identification, determines whether target RAN is supported to ensure LIPA The switching of PDN business continuances.

5. method as claimed in claim 4, it is characterised in that the local gateway mark includes local gateway title, locally It is the local Internet Protocol Security tunnel address of gateway core net address, local gateway public network address, local gateway, local In the address of gateway customer face any one or it is multiple.

6. method as claimed in claim 5, it is characterised in that the switching is supported to indicate to include the first instruction and the second instruction In any one or it is multiple, described second indicates for indicating target RAN whether the allocated LIPA PDN connections Bearing resource.

7. the method for claim 1, it is characterised in that methods described also includes：

If target RAN supports the switching for ensureing LIPA PDN business continuances, target RAN is according to the foundation LIPA PDN connections indicate to set up Internet Protocol Security tunnel with the source local gateway.

8. method as claimed in claim 7, it is characterised in that methods described also includes：

Target RAN receives the LIPA upstream data bags sent after the user equipment is accessed；

Target RAN sends the LIPA on line number to the source local gateway by the Internet Protocol Security tunnel According to bag, uplink Tunnel Identifier in the LIPA upstream datas bag, is included.

9. method as claimed in claim 8, it is characterised in that methods described also includes：

After the LIPA upstream datas bag is received, target RAN sends downlink transfer tunnel to the source local gateway and builds Vertical request；

Target RAN receives the LIPA downlink data packets that the source RAN sends, comprising described in the LIPA downlink data packets The end mark that source local gateway is asked according to the downlink transfer tunnel building and added, the end mark are used to indicate institute State last LIPA downlink data packet that LIPA downlink data packets are that the source local gateway is sent to the source RAN；

Target RAN begins through the Internet Protocol Security tunnel and receives the source sheet according to the end mark The LIPA downlink data packets that ground gateway sends, include downlink transfer Tunnel Identifier in the LIPA downlink data packets.

10. method as claimed in claim 9, it is characterised in that the downlink transfer Tunnel Identifier and the uplink tunnel Road mark is identical, or

The newly assigned downlink transfer Tunnel Identifier of target RAN is included in the downlink transfer tunnel building request.

11. the method for claim 1, it is characterised in that methods described also includes：

Target RAN receives the user equipment please according to the access that the information that the LIPA PDN connect bearing resource sends Seek or receive the LIPA upstream data bags that the user equipment sends；

Triggering of target RAN according to the access request or LIPA upstream data bags, is set up with the source local gateway The two-way Internet protocol safety tunnel of UE granularities.

12. methods as claimed in claim 11, it is characterised in that methods described also includes：

Target RAN receives line number under the LIPA that the source RAN sends by the two-way Internet protocol safety tunnel According to bag, comprising the source local gateway in the two-way Internet protocol safety tunnel building in the LIPA downlink data packets The end mark added after success, the end mark are used to indicate that the LIPA downlink data packets are what the source RAN sent Last LIPA downlink data packet；

Target RAN starts to receive LIPA downlink data packets from the source local gateway according to the end mark.

13. methods as claimed in claim 3, it is characterised in that it is described whether determination target RAN is supported to be connected to Source local gateway includes：

Whether there is in determining the local gateway connectivity relation table that target RAN is pre-saved the LAN of source local gateway Mark is closed, the local gateway connectivity relation table is used to preserve the local of local gateway that target RAN is connectable to Gateway identification.

14. methods as claimed in claim 13, it is characterised in that whether determination target RAN is supported to ensure LIPA The switching of PDN business continuances also includes：

If there is no the local gateway mark of the source local gateway in the local gateway connectivity relation table, further taste Whether examination is connectable to the source local gateway.

15. methods as claimed in claim 14, it is characterised in that methods described also includes：

If, through being determined to be connected to the source local gateway, target RAN is also by the source sheet for target RAN During the local gateway mark of ground gateway adds the local gateway connectivity relation table.

A kind of 16. methods of data transfer, it is characterised in that include：

Source RAN sends handover request message to target RAN, includes RAB information to be set up and build in the handover request message Vertical LIPA PDN connections are indicated, described to set up LIPA PDN connections instruction for indicating that the target RAN distribution LIPA PDN connect Bearing resource is connect, the RAB information to be set up is used to indicate the target RAN distribution RAB resources；

The source RAN receives the handover request ack message that target RAN sends, and includes in the handover request ack message The information of the information and/or RAB resources of the LIPA PDN connections bearing resource；

Whether support to indicate comprising switching in judging the switching response message, wherein, the switching is supported to indicate for indicating Whether target RAN supports that the switching for ensureing LIPA PDN business continuances, the switching are supported to indicate to include the first instruction, Described first indicates for indicating whether target RAN is supported to be connected to source local gateway；

When in the switching response message, comprising the switching support instruction, LIPA PDN connections are carried by the source RAN The information of the information and/or RAB resources of resource is sent to user equipment, so that the user equipment connects according to the LIPA PDN Target RAN described in the information access of the information and/or RAB resources that connect bearing resource.

17. methods as claimed in claim 16, it is characterised in that described to set up LIPA PDN connection instructions and be included in and wait to set up RAB information in；

Radio resource control information is sent to before user equipment in the source RAN, methods described also includes：

If supporting to indicate not comprising the switching in the switching response message, in judging the radio resource control information Whether the information of bearing resource is connected comprising LIPA PDN；

If connecting the information of bearing resource in the radio resource control information comprising LIPA PDN, by the LIPA PDN The information deletion of connection bearing resource；

The source RAN sends the information of the RAB resources to user equipment, so that the user equipment is provided according to the RAB Target RAN described in the information access in source.

18. methods as claimed in claim 16, it is characterised in that described whether to judge in the switching response message comprising cutting Change support to indicate, the switching is supported to indicate for indicating whether target RAN is supported to ensure LIPA PDN business continuances Switching specifically include：

Described to judge whether support to indicate comprising switching in the switching response message, the switching is supported to indicate for the mesh Whether mark RAN supports to be connected to source local gateway.

19. methods as claimed in claim 18, it is characterised in that the switching is supported to indicate to include that the first instruction and second refers to In showing any one or it is multiple, wherein, described second indicates for indicating whether target RAN has built up LIPA PDN connects bearing resource.

20. methods as claimed in claim 16, it is characterised in that described to set up during LIPA PDN connections are indicated comprising source The local gateway mark of gateway and/or home network identification.

21. methods as claimed in claim 20, it is characterised in that the local gateway mark includes local gateway title, sheet Ground gateway core net address, local gateway public network address, the local Internet Protocol Security tunnel address of local gateway, sheet In ground gateway user plane address any one or it is multiple.

22. methods as claimed in claim 16, it is characterised in that methods described also includes：

The source RAN receives the LIPA downlink data packets that the source local gateway sends, comprising end in the downlink data packet Labelling, the end mark be the end mark be used for indicate the downlink data packet be sent to source RAN last under Row packet；

Downlink data packet comprising the end mark is transmitted to target RAN by the source RAN, so that target RAN Start to receive the downlink data that the source local gateway sends.

23. method as claimed in claim 16, it is characterised in that send handover request message to target RAN in the source RAN Before, methods described also includes：

The measurement report that source RAN receive users equipment sends；

Target RAN that source RAN selects to switch according to default adjacent cell list and the measurement report, the adjacent cell Local gateway mark comprising adjacent cell RAN for supporting connection local gateway in list.

24. methods as claimed in claim 23, it is characterised in that whether comprising switching in the switching response message is judged After supporting to indicate, methods described also includes：

If switching support instruction comprising described in the switching response message, according to instruction renewal is supported in the switching Adjacent cell list.

25. a kind of wireless access network equipments, it is characterised in that include：

Receiver module, for receiving the handover request message of source RAN transmissions, includes nothing to be set up in the handover request message Line access bearer RAB information is indicated with local IP access packet data network LIPA PDN connections are set up；

Processing module, the LIPA PDN that set up for being received according to the receiver module connect instruction, determine the RAN Whether equipment supports the switching for ensureing LIPA PDN business continuances；

Resource sets up module, if the determination result for the processing module is that RAN equipment is supported to ensure LIPA PDN business Successional switching, then according to it is described set up LIPA PDN connection instruction set up LIPA PDN connection bearing resource, according to described RAB information to be set up sets up RAB resources；

Sending module, for sending handover request ack message to the source RAN, includes institute in the handover request ack message State resource set up module assignment LIPA PDN connection bearing resource information and RAB resources information so that the source RAN The information for connecting the information and RAB resources of bearing resource according to the LIPA PDN makes user equipment access target RAN, wherein, Also support to indicate comprising switching in the handover request ack message, the switching is supported to indicate for indicating target RAN Whether support ensures the switching of LIPA PDN business continuances, and the switching is supported to indicate to include the first instruction, first finger Show for indicating whether target RAN is supported to be connected to source local gateway.

26. wireless access network equipments as claimed in claim 25, it is characterised in that

The resource sets up module, if the determination result for being additionally operable to the processing module is not supported to ensure for the RAN equipment The switching of LIPA PDN business continuances, then set up RAB resources according to the RAB information to be set up；

The sending module, is additionally operable to send handover request ack message to the source RAN, in the handover request ack message Information comprising the RAB resources, so that the source RAN is according to the information of the RAB resources makes user equipment access Target RAN.

27. wireless access network equipments as claimed in claim 25, it is characterised in that

The processing module, the LIPA PDN that set up specifically for being received according to the receiver module connect instruction, really Whether fixed target RAN is supported to be connected to the source local gateway.

28. wireless access network equipments as claimed in claim 25, it is characterised in that

The receiver module, specifically for receiving the handover request message that source RAN sends, includes in the handover request message and treats The RAB RAB information of foundation is indicated with local IP access packet data network LIPA PDN connections are set up, described to build During vertical LIPA PDN connections are indicated, the local gateway comprising the source local gateway is identified and/or home network identification；

The processing module, the local gateway mark of the source local gateway specifically for being received according to the receiver module Know, determine whether target RAN is supported to ensure the switching of LIPA PDN business continuances；Or

The processing module, the home network identification of the source local gateway specifically for being received according to the receiver module The local gateway mark of the source local gateway is obtained, the target is determined according to the local gateway of source local gateway mark Whether RAN supports the switching for ensureing LIPA PDN business continuances.

29. wireless access network equipments as claimed in claim 28, it is characterised in that

The receiver module, specifically for receiving the handover request message that source RAN sends, includes in the handover request message and treats The RAB RAB information of foundation is indicated with local IP access packet data network LIPA PDN connections are set up, described to build During vertical LIPA PDN connections are indicated, the local gateway comprising the source local gateway is identified and/or home network identification, described Ground gateway identification includes local gateway title, local gateway core net address, local gateway public network address, local gateway sheet Ground Internet Protocol Security tunnel address, in local gateway user plane address any one or it is multiple.

Wireless access network equipment in 30. such as claim 25 to 29 as described in any one, it is characterised in that

The sending module, specifically for sending to the source RAN or being sent to the source RAN by Mobility Management Entity Handover request ack message, includes the first radio resource control information, so that the source in the handover request ack message RAN makes user equipment access target RAN according to the first radio resource control information.

31. wireless access network equipments as claimed in claim 30, it is characterised in that

The sending module, specifically for the Mobility Management Entity is sent or passed through to the source RAN to the source RAN Handover request ack message is sent, first radio resource control information in the handover request ack message, is included, so that Obtaining the source RAN makes user equipment access target RAN, the switching request response according to the first radio resource control information Also support to indicate comprising switching in message, the switching is supported to indicate for indicating whether target RAN is supported to ensure LIPA The switching of PDN business continuances, the switching are supported to indicate to include that first indicates and any one in the second instruction or many Individual, described second indicates for indicating whether the allocated LIPA PDN connect bearing resource to target RAN.

32. wireless access network equipments as claimed in claim 25, it is characterised in that the RAN equipment also includes：

Tunnel building module, if the determination result for the processing module is that the RAN equipment is supported to ensure LIPA PDN The switching of business continuance, then according to it is described set up LIPA PDN connection indicate set up Internet Protocol with the source local gateway Security tunnel.

33. wireless access network equipments as claimed in claim 32, it is characterised in that the RAN equipment also includes：

Data processing module, for receiving the LIPA upstream datas sent after the user equipment is accessed by the receiver module Bag, and for sending described to the source local gateway by the Internet Protocol Security tunnel by the sending module LIPA upstream data bags, include uplink Tunnel Identifier in the LIPA upstream datas bag.

34. wireless access network equipments as claimed in claim 33, it is characterised in that

The tunnel building module, is additionally operable to receiving the LIPA upstream datas bag that the data processing module is received Afterwards, the request of downlink transfer tunnel building is sent to the source local gateway by the sending module；

The data processing module is additionally operable to receive the LIPA downlink data packets that the source RAN sends by the receiver module, The knot asked according to the downlink transfer tunnel building and added comprising the source local gateway in the LIPA downlink data packets Beam labelling, the end mark are used to indicate that the LIPA downlink data packets are sent to the source RAN for the source local gateway Last LIPA downlink data packet；With

For according to the end mark, starting to control the receiver module by Internet Protocol Security tunnel reception The LIPA downlink data packets that the source local gateway sends, include downlink transfer Tunnel Identifier in the LIPA downlink data packets.

35. wireless access network equipments as claimed in claim 25, it is characterised in that

The receiver module is additionally operable to receive the information transmission that the user equipment connects bearing resource according to the LIPA PDN Access request or receive the LIPA upstream data bags that the user equipment sends；

The RAN equipment also includes：

Tunnel building module, for touching for the access request that received by the receiver module or LIPA upstream data bags Send out, the two-way Internet protocol safety tunnel of UE granularities is set up with the source local gateway.

36. wireless access network equipments as claimed in claim 35, it is characterised in that the RAN equipment also includes：

Data processing module, receives described by the two-way Internet protocol safety tunnel for controlling the sending module Source RAN send LIPA downlink data packets, in the LIPA downlink data packets comprising the source local gateway it is described it is two-way because The end mark that special fidonetFido security tunnel is added after being successfully established, the end mark are used to indicate line number under the LIPA According to last LIPA downlink data packet that bag is sent for the source RAN；With

Start to receive LIPA downlink datas from the source local gateway for according to the end mark, controlling the receiver module Bag.

37. a kind of wireless access network equipments, it is characterised in that include：

Sending module, for sending handover request message to target RAN, includes RAB to be set up in the handover request message Information and set up LIPA PDN connections and indicate, it is described to set up LIPA PDN connections and indicate for indicating target RAN distribution LIPA PDN connect bearing resource, and the RAB information to be set up is used to indicate the target RAN distribution RAB resources；

Message processing module, for judging whether refer to comprising switching support in the switching response message that receiver module is received Show, the switching is supported to indicate for indicating whether target RAN is supported to ensure the switching of LIPA PDN business continuances, institute State switching and support to indicate to include the first instruction that described first indicates for indicating whether target RAN is supported to be connected to source sheet Ground gateway；

Receiver module, for judging that the switching response message is supported to indicate comprising the switching when described information processing module, The handover request ack message that target RAN sends is received, the LIPA PDN in the handover request ack message, are included The information of the information and/or RAB resources of connection bearing resource；

The sending module, is additionally operable to send the information of the information and/or RAB resources of LIPA PDN connection bearing resources To user equipment, so that the user equipment connects the letter of the information and/or RAB resources of bearing resource according to the LIPA PDN Breath accesses target RAN.

38. wireless access network equipments as claimed in claim 37, it is characterised in that

The sending module is specifically for sending handover request message to target RAN, comprising yet to be built in the handover request message Vertical RAB information and set up LIPA PDN connections and indicate, it is described to set up LIPA PDN connections and indicate for indicating target RAN Distribution LIPA PDN connection bearing resources, the RAB information to be set up are used to indicate the target RAN distribution RAB resources, institute State set up LIPA PDN connection indicate be included in RAB information to be set up；

The RAN equipment also includes：

Message processing module, if for supporting to indicate not comprising the switching in the switching response message, judging described Whether the information of bearing resource is connected comprising LIPA PDN in radio resource control information；If the radio resource control information In comprising LIPA PDN connect bearing resource information, then by the LIPA PDN connect bearing resource information deletion；Pass through The sending module sends the information of the RAB resources to user equipment, so that the user equipment is according to the RAB resources Information access described in target RAN.

39. wireless access network equipments as claimed in claim 38, it is characterised in that

The sending module, specifically for sending handover request message to target RAN, comprising yet to be built in the handover request message Vertical RAB information and set up LIPA PDN connections and indicate, it is described to set up LIPA PDN connections and indicate for indicating target RAN Distribution LIPA PDN connection bearing resources, the RAB information to be set up are used to indicate the target RAN distribution RAB resources, institute State and set up the mark of the local gateway comprising source local gateway and/or home network identification during LIPAPDN connections are indicated, it is described local Gateway identification includes local gateway title, local gateway core net address, local gateway public network address, local gateway sheet Ground Internet Protocol Security tunnel address, in local gateway user plane address any one or it is multiple.

40. wireless access network equipments as claimed in claim 37, it is characterised in that the RAN equipment also includes：

Data processing module, it is for receiving the LIPA downlink data packets that source local gateway sends by the receiver module, described End mark is included in downlink data packet, the end mark is that the end mark is used to indicate the downlink data packet to send out Toward last downlink data packet of source RAN；The downlink data packet comprising the end mark is turned by the sending module Target RAN is issued, so that target RAN starts to receive the downlink data that the source local gateway sends.

41. a kind of communication systems, it is characterised in that include：Source RAN, target RAN and user equipment,

The source RAN includes RAB to be set up for sending handover request message to target RAN, in the handover request message Information is indicated with LIPA PDN connections are set up；

For connecting instruction according to the LIPA PDN that set up for receiving, target RAN determines whether target RAN props up Hold the switching for ensureing LIPA PDN business continuances；If target RAN is supported to ensure cutting for LIPA PDN business continuances Change, then LIPA PDN connection instruction distribution LIPA PDN connection bearing resources are set up according to described, according to the RAB to be set up Information distributes RAB resources；The source RAN sends handover request ack message, comprising described in the handover request ack message The information of the information and RAB resources of LIPA PDN connection bearing resources；

The source RAN is additionally operable to receive the handover request ack message that target RAN sends, the handover request ack message In comprising the LIPA PDN connect bearing resource information and/or RAB resources information；LIPA PDN connections are carried The information of the information and/or RAB resources of resource is sent to user equipment, wherein, also include in the handover request ack message Switching supports to indicate that the switching is supported to indicate for indicating whether target RAN is supported to ensure LIPAPDN business continuances Switching, the switching supports to indicate to include that first indicates, described first indicates for indicating the target RAN whether company of support It is connected to source local gateway；

Information access institute of the user equipment for information and/or RAB resources according to LIPAPDN connection bearing resources State target RAN.

42. communication systems as claimed in claim 41, it is characterised in that the communication system also includes source local gateway,

If target RAN is additionally operable to target RAN to support to ensure the switching of LIPAPDN business continuances, the mesh Mark RAN according to it is described set up LIPA PDN connection indicate set up Internet Protocol Security tunnel with the source local gateway；

The user equipment is additionally operable to the LIPA upstream data bags sent to target RAN after target RAN is accessed；

Target RAN is additionally operable to send the LIPA to the source local gateway by the Internet Protocol Security tunnel Upstream data bag and the request of downlink transfer tunnel building, include uplink Tunnel Identifier in the LIPA upstream datas bag；

The source local gateway is included in the LIPA downlink data packets for sending LIPA downlink data packets to the source RAN The end mark that the source local gateway is asked according to the downlink transfer tunnel building and added, the end mark are used to refer to Show that the LIPA downlink data packets are last LIPA downlink data packet that the source local gateway is sent to the source RAN；

The source RAN is additionally operable to receive the LIPA downlink data packets, and the LIPA downlink data packets are transmitted to the mesh Mark RAN；

Target RAN is additionally operable to receive the LIPA downlink data packets that the source RAN sends, according to the end mark, Begin through the Internet Protocol Security tunnel and receive the LIPA downlink data packets that the source local gateway sends.