CN101534496B - Method for obtaining home link information by user - Google Patents

Abstract

The invention provides a method for obtaining home link information by a user, which comprises: step one, after being attached to a GPRS network, UE sends a PDP context activating request to an SGSN, wherein the request comprises a special APN and a PCO; step two, after receiving the PDP context activating request, the SGSN queries the IP address of a GGSN by a DNS server according to the special APN and sends a PDP context establishing request to a corresponding GGSN according to the IP address, and the PDP context establishing request comprises a special APN and a PCO; and step three, after receiving the PDP context establishing request, the GGSN allocates CoA for the UE, judges that the UE supports the DSMIPv6 and then sends the allocated CoA and PCO information to the UE. The adoption of the method can accelerate discovering the home link when the UE utilizes the GPRS for accessing I-WLAN Mobility architecture or utilizes an E-UTRAN for accessing an EPS.

Description

A kind of method of obtaining home link information by user

Technical field

The present invention relates to communication technical field, more specifically, relate to a kind of method of obtaining home link information by user.

Background technology

(Interworking Wireless Local Area Network I-WLAN) is meant one and third generation partner program (3rd Generation Partnership Project, the 3GPP) wlan network of network interaction to mutual WLAN.Mutual purpose be make the WLAN access technology can with the cooperation of GPRS core-network infrastructure so that WLAN user can insert the GPRS packet service by the WLAN access network.

GPRS (General Packet Radio Service, GPRS) access network is by 3GPP Radio Access Network (GSM EDGE Radio Access Network/UMTS Terrestrial Radio Access Network, GERAN/UTRAN), Serving GPRS Support Node (Serving GPRS Support Node, SGSN), Gateway GPRS Support Node (Gateway GPRS Support Node, GGSN) and other support nodes constitute.

When the mobile subscriber has I-WLAN and GPRS access network access capability, need keep business continuance when between two kinds of access networks, switching.The 3GPP normal structure has determined to adopt two stack mobile Internet Protocol sixth versions, and (Dual-Stack Mobile Internet Protocol version 6 is DSMIPv6) as the technical solution that keeps this business continuance.This technical solution can the IP address remains unchanged so that the mobile subscriber is switched the back between I-WLAN and GPRS access network, and is continuously professional to realize.

Fig. 1 is the Organization Chart of mobility solution between I-WLAN network and the GPRS network (I-WLAN Mobility).Wherein GGSN has the function of HA.(User Equipment UE) can insert I-WLAN network and GPRS network to subscriber equipment.GGSN can think couple in router (Access Router, AR).The I-WLAN network can insert have home agent (Home Agent, HA) GGSN of function.H1 is the interface between HA and the UE.

In the prior art when UE inserts GPRS network, the business information that UE can insert needs is passed through the 3GPP Radio Access Network with APN (APN, Access Point Name) form is issued SGSN, SGSN issues DNS Server (Domain Name System Server after this APN information is contracted authentication and mandate, domain name system server) carry out domain name mapping, dns server is issued SGSN with the IP address of the GGSN of this APN information correspondence.GGSN has home agent (HA) function in the I-WLANMobility of Fig. 1 system, owing in existing GPRS network, in most cases be deployed with a plurality of GGSN, not all GGSN has the function of HA, if do not have the HA function by the GGSN that resolves the IP address correspondence that APN information obtains, will increase and I-WLAN between the complexity of mobile management.For example when GPRS is configured to user's home link, need use the tunnel transmission user data between selecteed independently GGSN and a HA, this will strengthen the complexity of data route, increase the data time-delay.Employing the method for the invention can be so that have GGSN selected use when UE inserts GPRS network of HA function, make simultaneously UE finish the IP address that just obtains HA on above-mentioned and the GGSN when GPRS inserts with and be positioned at the information of home link, like this will be no longer need use additive method to obtain above-mentioned information after inserting finishing GPRS.At first this will accelerate UE and use GPRS to insert the access speed of I-WLANMOBILITY framework, secondly also avoid may taking place to find respectively the independently situation of GGSN and HA.

The grouping system of 3GPP evolution (Evolved Packet System, EPS) by E-UTRAN (Evolved Universal Terrestrial Radio Access Network, the global mobile wireless access network of evolution), gateway (Serving Gateway, S-GW), data network gateway (P-GW, Packet Data Network GateWay, P-GW) and other support nodes form.S-GW is the accessing gateway equipment that links to each other with E-UTRAN, transmits data between E-UTRAN and P-GW, and is responsible for pending datas such as paging are carried out buffer memory; P-GW then is the borde gateway of EPS and PDN (packet data network, Packet Data Network) network, is responsible for the access of PDN, transmits function such as data between EPS and PDN.

Fig. 2 is the Organization Chart that allows non-3GPP network insertion EPS network.

As shown in Figure 2, the intercommunication of EPS support and non-3GPP network.P-GW is as 3GPP and the internetwork anchor point of non-3GPP.3GPP tissue definition E-UTRAN access network is the home link of UE.P-GW has the function of AR and HA.Similar with the I-WLAN mobility management network, if the user uses the mobile IP protocol DSMIPv6 based on terminal to insert the EPS network by E-UTRAN, UE need find HA and find that the E-UTRAN access network of current access is its home link.

In GPRS and EPS network, defined PCO (protocol configuration option, Protocol Configuration Option), come transmit outer protocol configuration situation with this option between UE and GGSN or the P-GW, the network element of command transmitting thinks that this option is transparent between UE and GGSN or P-GW, and they only need to transmit next network element and get final product.At present therefore this option position of withing a hook at the end can need UE, GGSN and P-GW can discern these information to wherein increasing some information in addition.

Mobile IP protocol is a kind of network layer scheme that locomotive function is provided on internet (Internet), makes node not interrupt ongoing communication when handoff links.Particularly mobile IP provides a kind of IP routing mechanism, and making still can be accessed by its home address when mobile node inserts foreign link.

Below will explain important proper noun about mobile IP:

Mobile node (Mobile Node): refer to move to another tie point from the tie point of a link among the mobile IP, simultaneously, still can pass through the accessed node of its home address.

Home agent (Home Agent, HA): refer to a router on the moving nodes local link.When mobile node left home link, the destination address that can intercept on its home link was the packet of moving nodes local address, was forwarded to the Care-of Address of mobile node registration by the tunnel.

Home address (Home Address, HoA): refer to distribute to the permanent IP address of mobile node, belong to the home link of mobile node.The IP routing mechanism of standard can send to its home link to the grouping of issuing the moving nodes local address.

Care-of Address (Care Of Address, CoA): the IP address that obtains when referring to mobile node visit foreign link.The subnet prefix of this IP address is the foreign subnet prefix.

Home link (Home Link): refer to network corresponding to the moving nodes local subnet prefix.

Foreign link (Foreign Link): refer to any link except its home link.

Binding (Binding): refer to the association between moving nodes local address and the Care-of Address.

When UE inserted I-WLAN Mobility network or EPS network as mobile node, mobile IP protocol (DSMIPv6) was used to keep IP address constant, to keep the customer service continuity.When UE inserted I-WLAN Mobility network and EPS network, GGSN and P-GW can distribute the Access Network address for UE as user's couple in router (AR), and when the user used mobility service, this address will be as Care-of Address (CoA).When UE used mobility service, UE initiates the Internet Key Exchange the 2nd edition, and (Internet Key Exchange version 2 IKEv2) set up Security Association with HA, and HA can issue UE for UE distributing IP address (HoA) and this address.

When inserting home link, UE do not use mobile IP protocol, not in the binding of HA with home address and Care-of Address.In Fig. 1, I-WLAN Mobility architecture configuration GPRS access network is user's a home link; In Fig. 2, the EPS network can dispose EPS access network (EUTRAN) and be user's home link.When the user inserted the home link of above-mentioned configuration, it can be home link so that the user finds the link of current access that three kinds of methods are arranged in the prior art:

Method one, with the home address of UE, information static configuration such as hometown-agent-address are in UE, and UE detects the router broadcast on the current IP link, if the link address prefix in the broadcasted content is consistent with the prefix of its home address, promptly thinks the access home link;

Method two, whether the link layer of UE detects current access technology, be home link according to the pre-configured current access network of information decision, and notice IP layer;

Method three, UE receives current access information, selects by the user whether current access link is home link.

Said method one and two need dispose corresponding information in UE, reduced the flexibility of using; Said method three needs the user to participate in, and has increased the complexity of using, and influences user experience.

Summary of the invention

In order to solve the problems of the prior art, the present invention proposes a kind of method of obtaining home link information by user.

The method of obtaining home link information by user of the present invention is:

For I-WLAN Mobility framework, this method comprises:

Step 1, after user equipment (UE) is attached to general packet radio service (GPRS) network, send the request of activation PDP Context to Serving GPRS Support Node SGSN, comprise particular access point title APN and protocol configuration option PCO in the request of wherein said activation PDP Context;

Step 2, after SGSN receives the request of described activation PDP Context, according to the IP address of specific APN by domain name system DNS server lookup Gateway GPRS Support Node GGSN, set up the PDP Context request according to described IP address to the GGSN of correspondence transmission, described foundation comprises specific APN and PCO in the PDP Context request;

Step 3, GGSN receive described set up the PDP Context request after, be that UE distributes Care-of Address CoA, judge that according to specific APN described UE supports two stack mobile Internet Protocol sixth version DSMIPv6, GGSN sends to UE with the CoA and the PCO information of described distribution.

Further, wherein said specific APN is resolved in dns server, obtains having the IP address of the GGSN of home agent HA function.

Further, wherein in the step 3, described PCO information comprises:

The IP address of HA, current GPRS network are the indication of home link or IP address or the address prefix the same with described CoA.

Further, if contain the indication that the current GPRS network is a home link in the described PCO information, UE judges that the current GPRS network is a home link; If contain IP address or the address prefix the same with described CoA in the described PCO information, UE judges that the current GPRS network is a home link.

Further, in the step 1, described PCO carries and shows that described UE supports the information of DSMIPv6; In the step 3, GGSN knows that from PCO UE supports DSMIPv6.

Further, wherein step 2 comprises:

SGSN receives the activation PDP Context request that UE sends;

Use is carried out authentication and authorization from the user signing contract information that home subscriber server HSS sends to UE;

After authentication and authorization, the information that SGSN will comprise specific APN sends to dns server;

Dns server obtains having the IP address of the GGSN of HA function according to described specific APN inquiry, and the IP address of described GGSN is sent to SGSN;

SGSN sends to this GGSN and sets up the PDP Context request, wherein comprises specific APN and PCO.

Further, wherein, step 3 comprises:

GGSN receive described set up the PDP Context request after, be that described UE distributes CoA;

GGSN is according to knowing among specific APN or the described PCO that described UE supports DSMIPv6;

GGSN sends context response information to SGSN, is included as CoA and PCO information that described UE distributes in the described context response information;

After SGSN receives described context response information, accept message by the activation PDP Context and will send to UE for CoA and the PCO information that described UE distributes.

Insert the EPS network for UE from E-UTRAN, described method comprises:

Steps A, UE is attached to the grouping system EPS network of evolution, adheres to and comprises PCO in the request, wherein carries among the PCO to show that UE supports the information of DSMIPv6;

Step B, Mobility Management Entity MME receive described adhere to request after, send to data network gateway P-GW and to set up the default bearing request, described foundation comprises described PCO in the default bearing request;

Step C, P-GW receive described set up the default bearing request after, for described UE distributes CoA, judge UE according to described PCO and support DSMIPv6, send described CoA and PCO information to UE for the UE distribution.

Further, wherein PCO information comprises:

The indication that the IP address of HA, current EPS access network are home link or with the same IP address or the address prefix of CoA that distributes for UE.

Further, wherein, if the indication that to contain current EPS network be home link in the PCO information, UE judges that the global mobile wireless access network E-URRAN access network of current evolution is a home link; If contain in the PCO information and described the same IP address or the address prefix of CoA for the UE distribution, UE judges that current E-UTRAN access network is a home link.

Further, wherein, step B comprises:

MME receive described adhere to request after, described UE is authenticated and authorizes, set up safety with UE and be connected;

After authentication was passed through with mandate, MME initiated position updating request to HSS, and HSS inserts MME with user contracting data, and the affirmation position is upgraded successfully;

MME initiates to set up the default bearing request to gateway S-GW, and described foundation in the default bearing request comprises PCO;

S-GW receive described set up the default bearing request after, described PCO is forwarded to P-GW.

Further, wherein, step C comprises:

P-GW receive described set up the default bearing request after, be that described UE distributes CoA;

P-GW knows that from described PCO UE supports DSMIPv6, sends to S-GW and sets up the default bearing response, and described foundation in the default bearing response comprises PCO information;

S-GW is transmitted to MME with described PCO information;

Described MME will adhere to and accept message and send to described UE, and described adhering to accepts to comprise in the message PCO information.

Adopt method of the present invention, do not need UE is carried out pre-configuredly also not needing the user to participate in, have application flexibility preferably.Adopt this method will accelerate UE and use GPRS to insert I-WLAN Mobility framework or the speed of discovery home link when using E-UTRAN to insert EPS, avoided the contingent independently situation of GGSN and HA that finds respectively.

Description of drawings

Fig. 1 is the Organization Chart of mobility solution between I-WLAN network and the 3GPP network (I-WLAN Mobility);

The Organization Chart of Fig. 2 right and wrong 3GPP network insertion EPS network;

Fig. 3 is at the discover method flow chart of I-WLAN Mobility framework according to the present invention;

Fig. 4 is at the discover method flow chart of EPS network according to the present invention;

Fig. 5 is the flow chart according to first embodiment of the inventive method;

Fig. 6 is the flow chart according to second embodiment of the inventive method.

Embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.

First embodiment:

Fig. 3 be according to the present invention at the discover method flow chart of I-WLAN Mobility framework:

S302, UE is attached to GPRS network, comprises specific APN in activating the PDP Context request, and optionally carries the information that shows that it supports DSMIPv6 in PCO;

S304, SGSN receives the activation PDP Context request that UE sends, using from HSS (Home Subscriber Server, home subscriber server) after the user signing contract information of sending carries out authentication and authorization to this user, the information that will comprise specific APN is issued the dns server inquiry, dns server is issued SGSN with the IP address of the GGSN that inquiry obtains, and SGSN sends to this GGSN and sets up the PDP Context request, wherein comprises specific APN and PCO;

After S306, GGSN receive and set up the PDP Context request message, can judge this user from specific APN and support DSMIPv6, show that this UE supports the information of DSMIPv6 if comprise among the PCO, GGSN can learn from PCO that also this user supports DSMIPv6 so.GGSN distributes an IP address (CoA) for this UE.After GGSN learns that this user supports DSMIPv6, GGSN sends to UE by PCO with home link information in setting up the PDP Context response message, be specially the CoA of above-mentioned distribution and be that the indication of home link or with CoA the same IP address or address prefix issue UE with the IP address of HA with the current GPRS network by PCO message.UE obtains the IP address of its HA from PCO, if contain the indication that the current GPRS network is a home link among the PCO, UE just can judge that the current GPRS network is a home link so; If contain IP address or an address prefix the same among the PCO with CoA, by IP address or address prefix are compared in itself and the Access Network address (CoA) that obtains from GGSN, if they are the same, so just can judge that the current GPRS access network is a home link.

Second embodiment:

Fig. 4 be according to the present invention at the discover method flow chart of EPS network,

S402, UE are attached to the EPS network, comprise PCO in adhering to request, carry among this PCO to show that this UE supports the information of DSMIPv6;

S404, MME (Mobility Management Entity, Mobility Management Entity) receive that UE sends comprise PCO adhere to request after, by setting up the default bearing request it is issued Serving GW, Serving GW sends the default bearing request of setting up that comprises PCO to P-GW

S406, P-GW shows that by what carry among the PCO this UE supports the information of DSMIPv6 to judge this UE and supports DSMIPv6, in setting up the default bearing response message, home link information is sent to UE, be specially and distribute to the IP address (CoA) of UE and UE to be issued in indication that is home link of the IP address of HA and current EPS access network or IP address or the address prefix the same with CoA by PCO message by PCO.UE will obtain the IP address of its HA from PCO.If the indication that to contain current EPS network among the PCO be home link, UE just can judge that current E-URRAN access network is a home link so; If contain IP address or the address prefix the same among the PCO,,, so just can judge that current E-UTRAN access network is a home link if they are the same by comparing IP address or address prefix with the Access Network address (CoA) that obtains from P-GW with CoA.

Fig. 5 is the flow chart according to first embodiment of the inventive method.

As shown in Figure 5, what present embodiment was described is that UE inserts GPRS network, and GPRS network is the home link of UE, and GGSN (as AR) has the HA function; Dispose specific APN among the UE, and this specific APN registers in this user's the subscription data in HSS, dns server also disposes the IP address information to the GGSN with HA function that should specific APN.Each step is described below:

S502, UE is attached to GPRS network, and HSS will comprise the user contracting data insertion SGSN of specific APN in attaching process, and SGSN preserves user signing contract information;

S504, UE initiate to activate the PDP Context request, wherein contain specific APN, and comprise the PCO that UE supports the information of DSMIPv6 agreement, and this PCO information is optional;

S506, after SGSN receives above-mentioned request, carry out authentication and authorization according to the user signing contract information that obtains from HSS, if above-mentioned specific APN is by authentication and mandate, SGSN sends to dns server to the information that comprises this APN, dns server finds the IP address to GGSN that should APN information, and sends to SGSN;

S508, SGSN initiates to set up the PDP Context request to the GGSN of correspondence according to the IP address of the GGSN that obtains, comprise specific APN in this request message, and the UE that can comprise supports the PCO of DSMIPv6 information;

After S510, GGSN receive above-mentioned message, will be UE distributing IP address, this address is the CoA of UE.GGSN can judge from specific APN or know that this UE supports DSMIPv6 from PCO, because this GGSN also has the HA function, therefore in setting up the PDP Context response message, this equipment is home link with IP address and the current GPRS access network of its HA in PCO indication or IP address or the address prefix the same with CoA are issued SGSN.

After S512, SGSN receive above-mentioned message, accept message, will send to UE from CoA and the PCO information that GGSN receives by activating PDP Context.UE will obtain the information of home link from PCO, comprising: the IP address of HA; If contain the indication that the current GPRS network is a home link among the PCO, UE just can judge that the current GPRS network is a home link so; If contain IP address or the address prefix the same with CoA among the PCO, by comparing IP address or address prefix with the Access Network address (CoA) that obtains from GGSN, if they are the same, UE just can judge that the current GPRS access network is a home link so.

Fig. 6 is the flow chart according to second embodiment of the inventive method.

As shown in Figure 6, what present embodiment was described is that UE inserts the E-UTRAN network, and the E-UTRAN network is the home link of UE, and P-GW has AR and HA function, and each step is described below:

S602, UE inserts E-UTRAN, and UE sends to MME and adheres to request, includes the PCO that UE supports DSMIPv6 information in this request;

S604, MME carries out authentication to this user, and sets up safe a connection with UE.If this user's information not among the MME in the authentication process, also need MME and HSS to carry out alternately this moment;

S606, after authentication and mandate were passed through, MME initiated position updating request to HSS, and HSS inserts MME with user contracting data, and the affirmation position is upgraded successfully.

S608, MME initiates to set up the default bearing request to S-GW, includes the PCO that UE supports DSMIPv6 information in this request; S-GW is transmitted to P-GW with this PCO after receiving this request;

After S610, P-GW receive above-mentioned message, will be UE distributing IP address, this address is the CoA of UE.P-GW knows that from PCO this UE supports DSMIPv6, because it also has the HA function, therefore in setting up the default bearing response, P-GW issues S-GW with himself IP address and the indication that is home link of current E-UTRAN access network or IP address or the address prefix the same with CoA in PCO, S-GW is transmitted to MME with above-mentioned information;

S612, MME will adhere to and accept message and send to UE by Radio Access Network, include PCO in the message.UE will obtain the information of home link from PCO, comprising: the IP address of HA; If the indication that to contain current E-UTRAN access network among the PCO be home link, UE just can judge that current network is a home link so; If contain IP address or the address prefix the same among the PCO,,, so just can judge that current access network is a home link if they are the same by comparing IP address or address prefix with the Access Network address (CoA) that obtains from P-GW with CoA.

S614 finishes initially and adheres to, and sets up default bearing between UE and the P-GW.

In sum, adopt method of the present invention, do not need UE is carried out pre-configuredly also not needing the user to participate in, have application flexibility preferably.Adopt this method will accelerate UE and use GPRS to insert I-WLAN Mobility framework or the speed of discovery home link when using E-UTRAN to insert EPS, avoided the contingent independently situation of GGSN and HA that finds respectively.

Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. the method for an obtaining home link information by user is characterized in that, described method comprises:

Step 1, after subscriber equipment (UE) is attached to GPRS (GPRS) network, send the request of activation PDP Context to Serving GPRS Support Node (SGSN), comprise particular access point title (APN) and protocol configuration option (PCO) in the request of wherein said activation PDP Context;

Step 2, after SGSN receives the request of described activation PDP Context, according to the IP address of specific APN by domain name system (DNS) server lookup Gateway GPRS Support Node (GGSN), set up the PDP Context request according to described IP address to the GGSN of correspondence transmission, described foundation comprises specific APN and PCO in the PDP Context request;

Step 3, GGSN receive described set up the PDP Context request after, for UE distributes Care-of Address (CoA), judge that according to specific APN described UE supports two stack mobile Internet Protocol sixth versions (DSMIPv6), GGSN sends to UE with the CoA and the PCO information of described distribution, wherein, described PCO information comprises: the IP address of home agent (HA), and the IP address the same or address prefix and current GPRS network with described CoA be in the indication of home link one of; If contain the indication that the current GPRS network is a home link in the described PCO information, UE judges that the current GPRS network is a home link; If contain IP address or the address prefix the same with described CoA in the described PCO information, UE judges that the current GPRS network is a home link.

2. the method for obtaining home link information by user according to claim 1 is characterized in that, described specific APN is resolved in dns server, obtains having the IP address of the GGSN of HA function.

3. the method for obtaining home link information by user according to claim 1 is characterized in that, in the step 1, described PCO carries and shows that described UE supports the information of DSMIPv6.

4. the method for obtaining home link information by user according to claim 3 is characterized in that, in the step 3, GGSN knows that from PCO UE supports DSMIPv6.

5. the method for obtaining home link information by user according to claim 1 is characterized in that, step 2 comprises:

SGSN receives the activation PDP Context request that UE sends;

The user signing contract information that use is sent from home subscriber server (HSS) carries out authentication and authorization to UE;

After authentication and authorization, the information that SGSN will comprise specific APN sends to dns server;

Dns server obtains having the IP address of the GGSN of HA function according to described specific APN inquiry, and the IP address of described GGSN is sent to SGSN;

SGSN sends to this GGSN and sets up the PDP Context request, wherein comprises specific APN and PCO.

6. the method for obtaining home link information by user according to claim 5 is characterized in that, step 3 comprises:

GGSN receive described set up the PDP Context request after, be that described UE distributes CoA;

GGSN is according to knowing among specific APN or the described PCO that described UE supports DSMIPv6;

GGSN sends context response information to SGSN, is included as CoA and PCO information that described UE distributes in the described context response information;

After SGSN receives described context response information, accept message by the activation PDP Context and will send to UE for CoA and the PCO information that described UE distributes.

7. the method for an obtaining home link information by user is characterized in that, described method comprises:

Steps A, UE is attached to grouping system (EPS) network of evolution, adheres to and comprises PCO in the request, wherein carries among the PCO to show that UE supports the information of DSMIPv6;

Step B, Mobility Management Entity (MME) receive described adhere to request after, send to data network gateway (P-GW) and to set up the default bearing request, described foundation comprises described PCO in the default bearing request;

Step C, P-GW receive described set up the default bearing request after, for described UE distributes CoA, judge UE according to described PCO and support DSMIPv6, send described CoA and PCO information to UE for the UE distribution, one of wherein, described PCO information comprises: in the indication that the IP address of HA and the IP address the same with the CoA that distributes for UE or address prefix and current EPS access network are home link; If the indication that to contain current EPS access network in the PCO information be home link, UE judges that current EPS access network is a home link; If contain in the PCO information and described the same IP address or the address prefix of CoA for the UE distribution, UE judges that current EPS access network is a home link.

8. the method for obtaining home link information by user according to claim 7 is characterized in that, step B comprises:

MME receive described adhere to request after, described UE is authenticated and authorizes, set up safety with UE and be connected;

After authentication was passed through with mandate, MME initiated position updating request to HSS, and HSS inserts MME with user contracting data, and the affirmation position is upgraded successfully;

MME initiates to set up the default bearing request to gateway (S-GW), and described foundation in the default bearing request comprises PCO;

S-GW receive described set up the default bearing request after, described PCO is forwarded to P-GW.

9. the method for obtaining home link information by user according to claim 8 is characterized in that, step C comprises:

P-GW receive described set up the default bearing request after, be that described UE distributes CoA;

P-GW knows that from described PCO UE supports DSMIPv6, sends to S-GW and sets up the default bearing response, and described foundation in the default bearing response comprises PCO information;

S-GW is transmitted to MME with described PCO information;

Described MME will adhere to and accept message and send to described UE, and described adhering to accepts to comprise in the message PCO information.

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