CN101778373B - Method, device and system for selecting grounding data network - Google Patents
Method, device and system for selecting grounding data network Download PDFInfo
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- CN101778373B CN101778373B CN 200910104959 CN200910104959A CN101778373B CN 101778373 B CN101778373 B CN 101778373B CN 200910104959 CN200910104959 CN 200910104959 CN 200910104959 A CN200910104959 A CN 200910104959A CN 101778373 B CN101778373 B CN 101778373B
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Abstract
The embodiment of the invention discloses a method, a device and a system for selecting grounding data network for realizing the selection on the grouping data network by a terminal. The method comprises the following steps: receiving DHCP discover message or DHCP Request message or DHCP Solicit message from the terminal by an anchoring gateway, wherein the DHCP discover message or the DHCP Request message or the DHCP Solicit message carries grounding data network PDN selection information; and sending PDN authorization request message to an authentication device, wherein the PDN request message carries the PDN selection information so that the authentication device can select the grounding data network gateway PDN GW for the terminal according to the PDN subscription information of the terminal and the PDN selection information.
Description
Technical field
The invention belongs to communication technical field, relate in particular to a kind of method, equipment and system of selecting packet data network.
Background technology
3GPP (3rd Generation Partnership Project, third generation partner program) and 3GPP2 (3rd Generation Partnership Project 2,3rd Generation Partnership Project two), WiMAX (Worldwide Interoperability for Microwave Access, whole world access microwave interoperability) etc. is the mainstream standard of the existing third generation communication technology.It is the indispensable branch of technical development that intercommunication between several standard networks and business are shared always.
From non-3GPP (non-3rd Generation Partnership Project, non-third generation partner program) connecting system is linked into EPC (Evolved Packet Core, the evolved packet system core net) in process, MS (Mobile Station, mobile terminal)/UE (User Equipment, subscriber equipment) need to set up PDN (Packet Date Network, packet data network) with network connects.The corresponding different business of PDN provides network, enjoys different business thereby MS/UE can access different PDN by EPC.In the prior art, in the 3GPP Access Network, after the MS/UE access authentication was completed, the PDN context that the direct selection of PDN subscription information that MME provides according to HSS is specified acquiescence was that MS/UE distributes PDN GW, and the connection between foundation and acquiescence PDN.When MS/UE need to connect with the PDNGW of non-acquiescence, need to initiate the foundation of additional PDN (newly-increased PDN).
The inventor finds, in the prior art, the flow process that MS/UE request additional PDN is connected does not have how its APN that asks of informing network side of clear and definite MS/UE, namely there is no clear and definite concrete step or message, clearly which main body how not to be the described additional PDN of terminal selection by yet.Therefore, be in fact the MS/UE that at all can't realize to the selection of additional PDN according to the description of existing protocol.
Summary of the invention
The embodiment of the invention discloses a kind of method, equipment and system of selecting packet data network, to realize that terminal is to the selection of packet data network.
The invention process discloses a kind of method of selecting packet data network on the one hand, and the method comprises:
Anchor ASN-GW receives DHCP discover message or DHCP Request message or the DHCP Solicit message of self terminal, carries PDN selection information in described DHCP discover message or DHCP Request message or DHCP Solicit message;
Send the PDN authorization request message to authentication device, carry described PDN in described PDN authorization request message and select information, so that described authentication device is that described terminal is selected grouped data network gateway PDN GW according to PDN subscription information and the described PDN selection information of the described terminal of self preserving.
On the other hand, the embodiment of the invention also discloses a kind of method of selecting packet data network, the method comprises:
Access service gateway ASN GW receives DHCP discover message or DHCPRequest message or the DHCP Solicit message of self terminal, carries PDN selection information in described DHCP discover message or DHCPRequest message or DHCP Solicit message;
Be that described terminal is selected grouped data network gateway PDN GW according to PDN subscription information and the described PDN selection information of the described terminal of self preserving.
On the other hand, the embodiment of the invention also discloses a kind of device of assisted Selection packet data network, comprising:
The first receiver module: be used for receiving DHCP discover message or DHCPRequest message or the DHCP Solicit message of self terminal, carry PDN selection information in described DHCP discover message or DHCPRequest message or DHCP Solicit message;
The first sending module: be used for sending the PDN authorization request message to authentication device, the described PDN that carries in described PDN authorization request message from described the first receiver module selects information.
The embodiment of the present invention also discloses a kind of device of selecting packet data network simultaneously, comprising:
Receiver module: be used for receiving the DHCP discover message that carries PDN selection information or DHCP Request message or the DHCP Solicit message of self terminal, perhaps select the PDN authorization request message of information from the described PDN of carrying of anchor ASN-GW;
Preserve module: the PDN subscription information that is used for preserving described terminal;
PDN selection functional module: be used for selecting information and being that described terminal is selected grouped data network gateway PDN GW from the described PDN subscription information of described preservation module according to the described PDN from described receiver module.
The embodiment of the invention also discloses a kind of system of selecting packet data network, described system comprises anchor ASN-GW and authentication device, wherein,
Described anchor ASN-GW is used for receiving DHCP discover message or DHCPRequest message or the DHCP Solicit message of self terminal, carry PDN selection information in described DHCP discover message or DHCPRequest message or DHCP Solicit message, send the PDN authorization request message to authentication device, carry described PDN in described PDN authorization request message and select information;
Described authentication device is used for according to the PDN subscription information of the described terminal of self preserving and is that described terminal is selected grouped data network gateway PDN GW from the described PDN selection information of described anchor ASN-GW.
In addition, the embodiment of the invention also discloses a kind of method of selecting packet data network, comprising:
Access service gateway ASN GW receives the access way indication of self terminal;
Reception from the switching of the described terminal of AAA server AAA before the PDN link information;
According to PDN link information before described access way indication and described switching, initiate mobile internet protocol MIP registration, set up packet data network PDN and connect.
Accordingly, the embodiment of the present invention further discloses a kind of device of selecting packet data network, and described device comprises:
The first receiver module: be used for receiving the access way indication;
The second receiver module: be used for receiving the AccessAccept message from AAA server AAA, carry the front PDN link information of switching of described terminal in described Access Accept message;
Mobile Internet Protocol MIP Registering modules: be used for basis from the described access way indication of described the first receiver module with from PDN link information before the described switching of described the second receiver module, initiate mobile internet protocol MIP registration, set up packet data network PDN and connect.
The embodiment of the present invention further discloses a kind of system of selecting packet data network, and described system comprises AAA server AAA and access service gateway, wherein,
Described AAA server AAA is used for sending AccessAccept message to described access service gateway, PDN link information before the switching of carried terminal in described Access Accept message;
Described access service gateway is used for receiving the access way indication from described terminal, and from PDN link information before the described switching of described AAA server AAA, and initiate mobile internet protocol MIP registration according to PDN link information before described access way indication and described switching, set up packet data network PDN and connect.
By using the disclosed method of the embodiment of the present invention, equipment and system, terminal can send PDN to service access gateway and select information or access way indication, selecting information and PDN subscription information by described service access gateway according to described PDN is described terminal distribution packet data network PDN GW address, be perhaps that described terminal is set up described terminal request in the PDN connection that switching keeps afterwards according to described access way indication with being connected front PDN link information, realize that terminal is to the selection of packet data network PDN.
Description of drawings
Fig. 1 is the method flow diagram of the disclosed selection packet data network of the embodiment of the present invention;
Fig. 2 is the method flow diagram of the disclosed selection packet data network of the embodiment of the present invention;
Fig. 3 is the method flow diagram of the disclosed selection packet data network of the embodiment of the present invention;
Fig. 4 is the method flow diagram of the disclosed selection packet data network of the embodiment of the present invention;
Fig. 5 is the apparatus structure schematic diagram of the disclosed assisted Selection packet data network of the embodiment of the present invention;
Fig. 6 is the apparatus structure schematic diagram of the disclosed selection packet data network of the embodiment of the present invention;
Fig. 7 is that the system of the disclosed selection packet data network of the embodiment of the present invention consists of schematic diagram;
Fig. 8 is the method flow diagram of the disclosed selection packet data network of the embodiment of the present invention;
Fig. 9 is the method flow diagram of the disclosed selection packet data network of the embodiment of the present invention;
Figure 10 is the apparatus structure schematic diagram of the disclosed selection packet data network of the embodiment of the present invention;
Figure 11 is that the system of the disclosed selection packet data network of the embodiment of the present invention consists of schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the specific embodiment of the invention is described in further detail.
The present embodiment discloses a kind of method of selecting packet data network.
The present embodiment is by take the scene of WiMAX Access Network access EPC as example, illustrates that terminal selects the method for PDN.Described method as shown in Figure 1, concrete steps are as follows:
Concrete, in one embodiment, can directly expand described DHCPdiscover message or DHCP Request message or DHCP Solicit message by the mode that increases cell and carry described PDN selection information.In another is implemented, also can carry described PDN by the mode of expansion NAI and select information, and the NAI after described expansion is carried in described DHCP discover message or DHCPRequest message or DHCP Solicit message....! ] WiMAX-decoration}usernamerealm, wherein, RoutingRealm is the domain name item, is an option, when MS/UE is in roaming state, constructs the visited place domain-name information, is used for assisting Route Selection; WiMAX-decoration} is an option, is used for indicating the ability of MS/UE or intention etc., and this can be expanded, and expansion WiMAX-decoration item adopts the mode of " avp=xxx ", wherein " xxx " represent concrete property value; Username is the identity at user's home network identifying user.Describedly carry described PDN and can be specifically by expansion NAI, MS/UE NAI { the WiMAX-decoration} item arranges described PDN and selects information.Take described PDN selection information as APN as example, namely WiMAX-decoration} is set to " apn=XXX ".Described " apn=XXX " not necessarily need to use " apn " character, only need described PDN selection information to be arranged at that described { the WiMAX-decoration} item gets final product.
step 102, FA (Foreign Agent on described Anchor GW, the external agent) from described DHCP discover message or DHCP Request message or DHCP Solicit message, perhaps in another is implemented, in the NAI through expansion that carries from described DHCP discover message or DHCP Request message or DHCPSolicit message, the described PDN that parses described MS/UE selects information, and send PDN authorization requests PDN Authorization Request message to Authenticator (authentication device), carry described PDN in described PDN Authorization Request message and select information.Generally, it is generally acknowledged that described DHCP Relay or DHCP Proxy and described FA are positioned at same entity.
The PDN selection function of step 103, described Authenticator enters at terminal initial the user PDN subscription information of receiving from HSS/AAA in network process according to what preserve on it, PDN to described PDN selection information indication authorizes, and is that described terminal is selected grouped data network gateway PDN GW.Described mandate is specially: in user's PDN subscription information, comprised the PDN identification list that the user orders, namely which PDN the user can access.Authenticator parses described PDN and selects information from described PDN authorization requests PDN AuthorizationRequest message, determine that according to described PDN selection information MS/UE wants the PDN that connects, described PDN selects the list of the corresponding relation of information and PDN to determine in the negotiations process of network design, and described MS/UE and network side all use identical corresponding relation list, according to the network design agreement, remain with described corresponding relation list on described Authenticator, can select information inquiry to corresponding PDN according to described PDN.Further, described Authenticator determines by the described PDN subscription information of inquiry whether the PDN of described PDN selection information indication is included in the PDN list of user's subscription; If so, authorize and pass through, otherwise do not pass through.Pass through if authorize, described PDN selection functional entity is that described MS/UE distributes PDN GW address.
Need to prove, described Authenticator also may be positioned on described Anchor GW.At this moment, the GW of Anchor described in step 102 can omit to the step that described Authenticator sends described PDN AuthenrizationRequest message, but other guide still need be carried out.
By using the disclosed method of the embodiment of the present invention, terminal is by expansion DHCP discover message or DHCP Request message, can report that PDN selects information to network side, the PDN subscription information that the HSS/AAA that obtains in initial authentication that selects information by Authenticator according to described PDN and self preserve issues is that terminal is selected PDN GW, makes the terminal realization to the selection of PDN.
Above-described embodiment is take termination extension DHCP discover message or DHCP Request message or DHCP solicit message as example, illustrated that terminal selects the method for PDN.The disclosed scheme of above-described embodiment is applicable to the scene that the PDN of mode that MS/UE connects with Additional PDN and request connects.In described connection, network side is that described MS/UE distributes PDN GW according to initial policy.Merge in the scene of EPC network at WiMAX, described MS/UE might be that the Access Network from 3GPP switches and enters the WiMAX Access Network.Under this scene, level and smooth for what guarantee to switch, it is that it distributes and switches front identical PDN GW that described MS/UE need to ask network side.The present embodiment discloses the method that another kind of terminal is selected PDN, further to address this problem as a preferred embodiment.Described method as shown in Figure 2, concrete steps are as follows:
Step 201, terminal MS/UE DHCP Relay (the Dynamic HostConfiguration Protocol Relay on the Anchor GW, dynamic host configuration protocol relay)/FA (Foreign Agent, the external agent) send DHCP discover (dynamic host configuration protocol discover, DHCP is found) message.Generally, it is generally acknowledged that described DHCP Relay and described FA are positioned at same entity.
Optionally, carry PDN in described DHCP discover message and select information and access way indication (Request Type or Attach Type).Described PDN selection information is used to indicate the PDN that described MS/UE request connects, and described access way indication is used to indicate PDN establishment of connection mode.For example, if described access way is designated as initial (initially), represent that described MS/UE request connects with the PDN of initial access way and the indication of described PDN selection information.Described PDN establishment of connection mode is uninevitable consistent with the mode of described MS/UE access WiMAX network, be that described MS/UE switches access WiMAX network from the 3GPP Access Network, but described MS/UE still can ask to connect with the PDN that initial mode is set up after switching.Perhaps, if described access way is designated as handover (switching), represent that described MS/UE switches networking from other access net system, ask simultaneously after switching to connect with the PDN of described PDN selection information indication, and the PDN of described PDN selection information indication is identical with the PDN that connects before described MS/UE switches or described MS/UE switch before of a plurality of PDN of connection.Need to prove, if described access way is initial (initially), described access way indication also can be default, namely only carries described PDN in described DHCP discover message and select information.Alternative, carry described PDN in this enforcement and select the mode of information and access way indication also can adopt the mode of the described PDN selection of expansion information in NAI to carry in described DHCP discover message.Concrete mode can be with reference to step 101 part embodiment illustrated in fig. 1.If adopt in the mode of expansion NAI and carry described access way indication, with carry described PDN by expansion NAI and select like info class, define the property value pair of access way indication, for example " AT=xxx ", wherein ' xxx ' value is initial or handover.Select information and the indication of described access way if carry simultaneously described PDN, carry simultaneously two property values pair, define respectively described PDN and select information and the indication of described access way.
Optionally, can also carry other parameters relevant with the network integration in described DHCP discover message, for example be used to indicate the PCO (Protocol Configuration Option, protocol configuration option) of protocol configuration type.Described PCO can indicate follow-up PDN to connect and set up which kind of MIP of employing (Mobile Internet Protocol, Mobile Internet Protocol) registration in process.In the narration of the present embodiment, will be example with PMIPv4 (Proxy Mobile Internet Protocol 4, proxy mobile internet protocol 4).Perhaps, described PCO can also indicate the desired IP address assignment mode of described MS/UE.In the narration of the present embodiment, will be take DHCP as example.
If the DHCP discover message in step 201 carries PDN and selects information, execution in step 202 is to step 204, otherwise direct execution in step 205.
Step 202, DHCP Relay/FA parse described PDN and select information from described DHCP discover message, and send PDN authorization requests PDN Authorization Request message to Authenticator, carry described PDN in described PDN Authorization Request message and select information, if described DHCP discover message also carries described access way indication, also carry described access way indication in described PDN AuthorizationRequest message.
The PDN selection function of step 203, described Authenticator enters at terminal initial the user PDN subscription information of receiving from HSS/AAA in network process according to what preserve on it, and the PDN that described PDN selection information is indicated authorizes.Concrete licensing process can be with reference to step 103 part embodiment illustrated in fig. 1.Pass through if authorize, described PDN selection functional entity is that described MS/UE distributes PDN GW address.Concrete, if do not carry described access way indication in described PDN Authorization Request message, perhaps carrying described access way indication and its value is initial, is directly that described MS/UE distributes PDN GW address according to initial policy.Described initial policy do not consider namely whether described MS/UE has set up with the PDN of described PDN selection information indication and is connected before switching, and is that described MS/UE distributes PDN GW address according to the flow process of the PDN of the described PDN selection information indication of described MS/UE initial request access.If carrying described access way indication and value in described PDN Authorization Request message is handover, the address assignment of the PDNGW that has connected before MS/UE that described PDN selection information is indicated, described switches is to described MS/UE.
Step 204, described Authenticator reply PDN authorization response PDN Authorization Response message to described DHCP Relay/FA, pass through if authorize, carry the address of the indication of PDN Authorization result and described PDN GW in described PDN AuthorizationResponse message, do not pass through if authorize, carry the indication of PDN Authorization result in described PDN Authorization Response message.
Step 205, DHCP Relay are forwarded to described DHCP Server according to be set to the address of its corresponding DHCP Server in the configuration information step 201 of oneself from the destination address in the described DHCP Discover message of described MS/UE with this message.
Step 206, DHCP Server are that described MS/UE distributes an IP address, and described IP address is carried at replies to described DHCP Relay in DHCP Offer message.
The described DHCP Offer message that step 207, described DHCP Relay will carry described IP address is transmitted to described MS/UE.
It is the IP address of its distribution that step 208, described MS/UE send DHCP Request (DHCP request) message authentication use network to described DHCP Relay, i.e. the described IP of step 207 address.
Optionally, do not select information if the DHCP discover message in step 201 is carried PDN, carry PDN in described DHCP Request message and select information and access way indication (Request Type or Attach Type).Perhaps, if described access way is initial (initially), described access way indication also can be default, namely only carries described PDN in described DHCP discover message and select information.The described PDN that carries in DHCP Request message selects the corresponding description that the mode of information and access way indication can refer step 201.Optionally, can also carry other parameters relevant with the network integration in described DHCP Request message, for example PCO, set up to adopt which kind of MIP registration in process to indicate follow-up PDN to connect.In the narration of the present embodiment, will be take PMIPv4 as example.
Need to prove, if the Request of DHCP described in step 208 message carries PDN and selects information, execution in step 202 is to the operation of step 204 herein, but the described DHCP discover message that wherein relates in the description of step 202 replaces with the DHCP Request message described in step 208.
Step 209, described DHCP Relay send MIP Trigger to the PMIP Client (PMIP client) with described Authenticator, trigger described PMIP Client and initiate the MIP registration process.Described PMIPClient sends MIP Trigger to described FA, initiates the MIP registration.
Step 210, described FA send registration request Registration Request message to PDN GW/HA, carry out the MIP registration.The PMIPv4 pattern is adopted in described MIP registration, and detailed process is used existing protocol, repeats no more herein.Merge in the EPC network at WiMAX, the function of described PDN GW and described HA is considered to together.
After step 211, MIP registration were completed, described PDN GW/HA replied registration response Registration Response message to described FA.
Step 212, DHCP Relay forward DHCP Request message to DHCP Server, confirm that using network is the IP address of its distribution.
Step 213, DHCP Server reply DHCP ACK message to DHCP Relay, confirm the use of IP address to described MS/UE.
Step 214, DHCP Relay forward described DHCP ACK message to described MS/UE,
Need to prove, the embodiment of the present invention has been considered the situation that the GW at described Authenticator place separates with Anchor GW.Both also can be positioned at same entity.If both be positioned at same entity, the information interaction between both realizes or can omit with internal agreement.Specifically in the present embodiment, the Authenticator that relates in step 202,204 and 209 and the interacting message between Anchor GW can omit or realize with the internal agreement of the GW at its place, but do not relate to mutual content, for example parse described PDN and select information from described DHCP discover message, still need carry out.
by using the disclosed method of the embodiment of the present invention, terminal MS/UE is by expansion DHCP discover or DHCP Request message, can report that PDN selects information to network side, the PDN subscription information that the HSS/AAA that obtains in initial authentication that selects information by Authenticator according to described PDN and self preserve issues is that terminal MS/UE selects PDN GW, make terminal MS/UE realization to the selection of PDN, further, can be by reporting the access way indication, the MS/UE that cross-over connection networking system is switched can realize the selection to the packet data network that needs after switching to keep to connect.
The method that a upper disclosed packet data network of embodiment is selected is applicable to dispose in network the scene of DHCPRelay.In the present embodiment, disposed DHCP Proxy in network to replace described DHCPRelay.Described method as shown in Figure 3, concrete steps are as follows:
Step 301, MS/UE send DHCP discover message to the DHCP Proxy/FA on Anchor GW.Generally, it is generally acknowledged that described DHCP Relay and described FA are positioned at same entity.
Carry PDN in described DHCP discover message and select information and access way indication (RequestType or Attach Type).The value of described access way indication can be initial or handover.Need to prove, if described access way is initial (initially), described access way indication also can be default, namely only carries described PDN in described DHCP discover message and select information.The concrete method of carrying described PDN selection information and access way indication in described DHCP discover message, and the concrete meaning of described access way indication value can be with reference to step 201 appropriate sections embodiment illustrated in fig. 2.
Optionally, can also carry other parameters relevant with the network integration in described DHCP discover message, for example PCO, set up to adopt which kind of MIP registration in process to indicate follow-up PDN to connect.In the narration of the present embodiment, will be take PMIPv4 as example.Perhaps, described PCO can also indicate the desired IP address assignment mode of described MS/UE.In the narration of the present embodiment, will be take DHCP as example.
The PDN selection function of step 303, described Authenticator enters at terminal initial the user PDN subscription information of receiving from HSS/AAA in network process according to what preserve on it, and the PDN that described PDN selection information is indicated authorizes.Pass through if authorize, described PDN selection functional entity is that described MS/UE distributes PDN GW address.Concrete licensing process and PDN GW address allocation procedure can be with reference to step 203 appropriate sections embodiment illustrated in fig. 2.
Step 304, described Authenticator reply PDN authorization response PDNAuthorization Response message to DHCP Proxy/FA, pass through if authorize, carry the address of the indication of PDN Authorization result and described PDN GW in described PDN Authorization Response message.Do not pass through if authorize, carry the indication of PDN Authorization result in described PDN Authorization Response message.
Step 305, described FA send registration request Registration Request message according to the triggering of PDN authorization response message in step 304 to PDNGW/HA, carry out the MIP registration.The PMIPv4 pattern is adopted in described MIP registration, and detailed process is used existing protocol, repeats no more herein.
After step 306, MIP registration were completed, described PDN GW/HA replied registration response Registration Response message to described FA.
Step 307, described DHCP Proxy are that described MS/UE distributes an IP address, and described IP address is carried in DHCP Offer message replies to described MS/UE.
It is the IP address of its distribution that step 308, described MS/UE send DHCP Request (DHCP request) message authentication use network to described DHCP Proxy, i.e. the described IP of step 307 address.
Step 309, DHCP Proxy reply DHCP ACK message to MS/UE, confirm the use of IP address to described MS/UE.
Step 310, DHCP Relay forward described DHCP ACK message to described MS/UE,
Need to prove, the embodiment of the present invention has been considered the situation that the GW at described Authenticator place separates with Anchor GW.Both also can be positioned at same entity.If both be positioned at same entity, the information interaction between both realizes or can omit with internal agreement.Specifically in the present embodiment, interacting message between the Authenticator that relates in step 302 and 304 and Anchor GW can omit or realize with the internal agreement of the GW at its place, but do not relate to mutual content, for example parse described PDN and select information from described DHCP discover message, still need carry out.
By using the disclosed method of the embodiment of the present invention, MS/UE is by expansion DHCP discover message, can report that PDN selects information to network side, the PDN subscription information that the HSS/AAA that obtains in initial authentication that selects information by Authenticator according to described PDN and self preserve issues is that MS/UE selects PDN GW, makes the MS/UE realization to the selection of PDN.Further, can make MS/UE that cross-over connection networking system is switched can realize selection to the packet data network that needs after switching to keep to connect by reporting access way indication.
Above-mentioned two preferred embodiments are all to adopt PMIPv4 Pattern completion MIP to be registered as the method that example illustrates that packet data network is selected with system, the present embodiment illustrates the other method of terminal selection packet data network by adopt PMIPv6 Pattern completion MIP to be registered as example with system.Described method as shown in Figure 4, concrete steps are as follows:
Optionally, carry PDN in described DHCP Solicit message and select information and access way indication (Request Type or Attach Type).The value of described access way indication can be initial or handover.Need to prove, if described access way is initial (initially), described access way indication also can be default, namely only carries described PDN in described DHCP Solicit message and select information.The concrete method of carrying described PDN selection information and access way indication in described DHCP Solicit message, and the concrete meaning of described access way indication value can be with reference to step 201 appropriate sections embodiment illustrated in fig. 2.
Optionally, can also carry other parameters relevant with the network integration in described DHCP Solicit message, for example be used to indicate the PCO of protocol configuration type.
If the DHCP Solicit message in step 404 carries described PDN and selects information, execution in step 405 is to step 407, otherwise direct execution in step 408.
The described PDN that step 405, described MAG/AR resolve from described MS/UE selects information, and send PDN authorization requests PDN Authorization Request message to Authenticator, carry described PDN in described PDNAuthorization Request message and select information, if described DHCP solicit message also carries described access way indication, also carry described access way indication in described PDN Authorization Request message.
The PDN selection function of step 406, described Authenticator enters at terminal initial the user PDN subscription information of receiving from HSS/AAA in network process according to what preserve on it, and the PDN that described PDN selection information is indicated authorizes.Pass through if authorize, described PDN selection functional entity is that described MS/UE distributes PDN GW address.Concrete licensing process and PDN GW address allocation procedure can be with reference to step 203 appropriate sections embodiment illustrated in fig. 2.
Need to prove, the embodiment of the present invention has been considered the situation that described Authenticator GW separates with Anchor GW.Both also can be positioned at same entity.If both be positioned at same entity, the information interaction between both realizes or can omit with internal agreement.
If that use in step 408 system is DHCP Relay, described DHCP Relay sends DHCP Relay-Forward message to DHCPServer (Dynamic Host Configuration Protocol server), carries described APN in described message.
If that use in system is DHCP Proxy:
DHCP Proxy is MS/UE distributing IP address according to described APN.
If that use in step 409 system is DHCP Relay, carry out this step: DHCP Server is described MS/UE distributing IP address according to described APN, and described IP address is carried at sends to DHCP Relay in DHCPRelay-Reply message.
If that use in system is DHCP Proxy, directly enter step 410.
It is the IP address of its distribution that step 411, described MS/UE send DHCP Request message authentication use network.
Alternatively, optional, if carrying PDN, the DHCP solicit message in step 404 do not select information, carry described PDN in described DHCP Request message and select information and access way indication (Request Type or Attach Type).Perhaps, if described access way is initial (initially), described access way indication also can be default, namely only carries described PDN in described DHCP discover message and select information.
Need to prove, if the Request of DHCP described in step 411 message carries PDN and selects information, execution in step 405 is to the operation of step 407 herein, but the described DHCP discover message that wherein relates in the description of step 405 replaces with the DHCP Request message described in step 411.
If what step 413 network configuration was used is DHCP Relay mode, described DHCP Relay sends DHCP Relay-Forward message to DHCP Server, carries the IP address that MS/UE described in step 411 confirms use in described message.
If that use in system is DHCP Proxy, direct execution in step 415.
Step 415, DHCP Proxy or DHCP Relay reply DHCP Reply message to described MS/UE, and the IP address that described MS/UE is determined to use is confirmed.
By using the disclosed method of the embodiment of the present invention, terminal is by expansion DHCP solicit or DHCP Request message, can report that PDN selects information to network side, be that terminal select PDN GW according to described information with the PDN subscription information that the HSS/AAA that obtains in initial authentication that self preserves issues by Authenticator, make the terminal realization to the selection of PDN, further, can be by reporting access way indication, make MS/UE that cross-over connection networking system is switched can realize selection to the packet data network that needs after switching to keep to connect.
The embodiment of the invention discloses a kind of device of assisted Selection packet data network.
As shown in Figure 5, described device comprises:
The first receiver module 500: be used for receiving DHCP discover message or DHCP Request message or DHCP Solicit message from terminal MS/UE, carry PDN selection information in described DHCP discover message or DHCP Request message or DHCP Solicit message.Described PDN selection information is used to indicate the PDN that described MS/UE request connects.
The first sending module 502: be used for sending the PDN authorization request message to authentication device, the described PDN that carries in described PDN authorization request message from described the first receiver module 500 selects information.
Optionally, if also carry the access way indication in the DHCP discover message that described the first receiver module 500 receives or DHCPRequest message or DHCP Solicit message, also carry the described access way indication from described the first receiver module 500 in the PDN authorization request message that described the first sending module 502 sends to authentication device.
Optionally, described device can also comprise:
The second receiver module 504: be used for receiving the PDN authorization response message from described authentication device, carrying network side in described PDN authorization response message is the address of the PDN GW of terminal distribution.
Described device can be the accessing business network gate ASN GW in the WiMAX access net system.
By using the disclosed device of the embodiment of the present invention, terminal can select information reporting to authentication device PDN, and can also receive authentication device is the address of the PDN GW of described terminal selection, realizes that terminal is to the selection of packet data network.
The embodiment of the invention discloses a kind of device of selecting packet data network.
As shown in Figure 6, described device comprises:
Receiver module 600: be used for receiving the DHCP discover message that carries PDN selection information or DHCP Request message or DHCP Solicit message from terminal MS/UE, perhaps select the PDN authorization request message of information from the described PDN of carrying of anchor ASN-GW;
Preserve module 602: the PDN subscription information that is used for preserving described terminal;
PDN selection functional module 604: be used for selecting information and the described PDN that described PDN selection information is indicated from the described PDN subscription information of preservation module 602 to authorize according to the described PDN from described receiver module 600, and be that described terminal is selected grouped data network gateway PDNGW.
Described mandate and selection course specifically can be with reference to step 103 appropriate sections embodiment illustrated in fig. 1.
Optionally, if also carry access way indication (for example Attach Type or Request Type) in described DHCP discover message or DHCP Request message or DHCPSolicit message, described receiver module 600 also is used for receiving described access way indication, 604 PDN that receive according to described receiver module 600 of described PDN selection functional module select information and the indication of described access way, and the described PDN subscription information that described preservation module 602 is preserved is that described terminal is selected grouped data network gateway PDN GW.Concrete selection course can be with reference to step 203 appropriate section embodiment illustrated in fig. 2.
Described device can be the accessing business network gate ASN GW in the WiMAX access net system.
By using the disclosed device of the embodiment of the present invention, PDN selection function module 604 can according to accepting that the PDN that comes self terminal that module 600 receives selects information and being that described terminal is selected PDN GW from the PDN subscription information of described preservation module 602, realize that terminal is to the selection of packet data network.
The embodiment of the present invention has further disclosed a kind of system of selecting packet data network.Described system comprises anchor ASN-GW 700 and authentication device 702 as shown in Figure 7, wherein,
Described anchor ASN-GW 700 is used for receiving DHCP discover message or DHCP Request message or the DHCP Solicit message from terminal MS/UE, carry PDN selection information in described DHCP discover message or DHCP Request message or DHCP Solicit message, send the PDN authorization request message to authentication device, carry described PDN in described PDN authorization request message and select information;
Described authentication device 702 is used for according to the PDN subscription information of the described terminal of self preserving and is that described terminal is selected grouped data network gateway PDNGW from the described PDN selection information of described anchor ASN-GW 700.
Described mandate and selection course specifically can be with reference to step 103 appropriate sections embodiment illustrated in fig. 1.
Optionally, if also carry access way indication (for example AttachType or Request Type) in the DHCP discover message that described anchor ASN-GW 700 receives or DHCPRequest message or DHCP Solicit message, described anchor ASN-GW 700 also carries described access way indication in the PDN authorization request message of authentication device 702 transmissions.At this moment, described authentication device 702 also will be designated as described terminal according to described access way and select grouped data network gateway PDN GW.Concrete selection course can be with reference to step 203 appropriate section embodiment illustrated in fig. 2.
By the disclosed system of application the present embodiment, can receive the PDN of self terminal to select information by described anchor ASN-GW 700, and send to described authentication device 702 by the PDN authorization request message, it is that terminal is selected PDN GW that described authentication device 702 is selected information and PDN subscription information according to described PDN, makes the terminal realization to the selection of packet data network.Further, described anchor ASN-GW 700 can also receive the access way indication of self terminal, and send to described authentication device 702 by the PDN authorization request message, it is that terminal is selected PDN GW that described authentication device 702 is selected information, the indication of described access way and PDN subscription information according to described PDN, realizes that the terminal of cross-system switching is to the selection of packet data network.
The disclosed methods, devices and systems of above each embodiment, switch from the 3GPP Access Network at terminal MS/UE and enter under the scene of WiMAX Access Network, adopted MS/UE to report PDN to select the scheme of information and access way indication in dhcp process, determining whether MS/UE asks to connect keeping its PDN that has set up after switching before switching, so that the MS/UE that cross-over connection networking system is switched can realize the selection to the packet data network that needs after switching to keep to connect.But the scheme of above-described embodiment is being kept after switching under the scene of more than of its PDN connection of having set up before switching in the MS/UE request, and described MS/UE can only ask a PDN to connect in a DHCP flow process.The present embodiment further discloses a kind of method that terminal is selected PDN, can realize selection to the one or more packet data network that need after switching to keep to connect further to make terminal that cross-over connection networking system is switched.
Described method as shown in Figure 8.Before the disclosed technical scheme of the present embodiment is carried out, MS/UE has passed through the 3GPP network insertion in EPC, described MS/UE may be connected with PDN, set up GTP (General Packet Radio Service Tunneling Protocol, general packet wireless service tunnel protocol) tunnel.Described switch to the WiMAX network after, in the described EPC of described WiMAX network insertion.Concrete steps are as follows:
Step 801, access service gateway ASN GW receive the access way indication of self terminal.
Described access way indication (Attach Type or Request Type) is used to indicate PDN establishment of connection mode.Described PDN establishment of connection mode is uninevitable consistent with the mode of described MS/UE access WiMAX network, be that described MS/UE switches access WiMAX network from the 3GPP Access Network, but described MS/UE still can ask to connect with the PDN that initial mode is set up after switching.For example, in the present embodiment, described MS/UE switches access WiMAX network from the 3GPP Access Network, if but described access way is designated as initial (initially), represent described MS/UE request after switching no longer with switching before any one PDN connect.Perhaps, if described access way is designated as handover (switching), represent described MS/UE request after switching will with switch before set up whole PDN that PDN is connected and connected.Concrete, described terminal MS/UE can the capability negotiation process of eating dishes without rice or wine when switching in, perhaps in the process of EAP authentication, perhaps after dhcp process in, when sending message to described ASN GW, expand described message and indicate to carry described access way.Perhaps, alternative, also can build network access Identifier NAI by described MS/UE, carry described access way indication by expanding described NAI, then in said process, described NAI is sent to ASN GW.The mode of concrete expansion NAI can be with reference to the appropriate section of step 201 embodiment illustrated in fig. 2.
Step 802, described ASN GW receive from PDN link information before the switching of the described MS/UE of home subscriber server HSS/ AAA server AAA.PDN link information before described switching, be specifically as follows PDN corresponding to PDN connection that described MS/UE sets up before switching, perhaps corresponding APN and PDN GW address corresponding to described APN, also comprise QoS (Qualityof Service, the quality of service) information that described PDN connects.Merge in the EPC network at WiMAX, described HSS and AAA are considered to together.
Concrete, the described access way indication of described ASN GW inquiry, if described access way indication value is initial, the Authenticator on described ASN GW is the PDN GW that described MS/UE selects an acquiescence according to the network design strategy, and by carrying out the MIP registration between described MAG or FA and described PDN GW, the PDN that sets up the network acquiescence for described MS/UE connects.If described access way indication value is handover, described MAG or FA according to described switching before the PDN link information, carry out the MIP registration between the PDN GW corresponding with described PDN link information, connect for described MS/UE sets up PDN, described PDN connects the PDN that sets up with described MS/UE and connects identical before switching.Concrete MIP registration process all adopts the flow process of existing protocol definition.The PDN that carries in described PDN link information, perhaps corresponding APN and PDN GW address corresponding to described APN are the opposite end PDN of ASN GW in described MIP registration process, and described QoS information namely is used for the QoS information of consulting in described MIP registration process.
The method that discloses by using the embodiment of the present invention, described MS/UE can report the access way indication to MAG/FA, described MAG/FA also can obtain PDN link information before described switching from HSS/AAA, and carry out the MIP registration according to PDN link information before described switching and the indication of described access way, to realize that described MS/UE is to the selection of the PDN after switching.
Figure 9 shows that the preferred embodiment for method shown in Figure 8 that another embodiment of the present invention discloses.Before the disclosed technical scheme of the present embodiment is carried out, MS/UE has passed through the 3GPP network insertion in EPC, described MS/UE may with are connected PDN and connect, set up one or more GTP (GeneralPacket Radio Service Tunneling Protocol, general packet wireless service tunnel protocol) tunnel.Described MS/UE detects the WiMAX network system, and determines to switch to the WiMAX network, with by in the described EPC of described WiMAX network insertion.Concrete steps are as follows:
Perhaps, optional, when described access way indication value is handover, can also carries one or more PDN in described SBC-REQ message and select information.It can be APN (Access Point Name, APN) or PDN domain name that described PDN selects information, perhaps contains the indication information of APN or PDN domain name, perhaps applied business information.Described PDN selection information represents that described MS/UE request keeps being connected with the PDN of described PDN selection information indication, and the PDN of described PDN selection information indication is one or several in the PDN that connects before described MS/UE switches, and this moment, described MS/UE only kept being connected with the PDN of described PDN selection information indication after switching.
Alternative, described MS/UE also can carry network access Identifier NAI in described SBC-REQ message, carry described access way indication by expanding described NAI.Further alternative, can also carry described PDN selection information by expanding described NAI.The mode of concrete expansion NAI can be with reference to the appropriate section of step 203 embodiment illustrated in fig. 2.
Continue to complete the described capability negotiation process of eating dishes without rice or wine according to the prior art flow process between step 904-step 906, described MS/UE and described ASN GW, concrete, described ASN GW sends MS_PreAttachment_Rsp message to described BS, described BS sends SBC-RSP message to described MS/UE, sends MS_PreAttachment_Ack message to described ASN GW.The function of each message, structure and the information interaction in this process are existing protocol and define, and the embodiment of the present invention repeats no more.
Authenticator (authentication device) initiation on step 907-step 908, described ASN GW and the access authentication between described MS/UE, described MS/UE and network side carry out access authentication and authentication, described access authentication adopts EAP (Extensible Authentication Protocol, Extensible Authentication Protocol) authentication.Described ASN GW sends EAP Request/Identity message to described BS, and to ask the identity of described MS/UE, described BS is transmitted to described MS/UE with described EAP Request/Identity message.
Step 909-step 910, described MS/UE are by the forwarding of described BS, send EAP Response/Identity message to described ASN GW, and in described EAP Response/Identity message with NAI (Network Access Identity, network access Identifier) as oneself identity response to the Authenticator on described ASNGW.Optionally, if do not carry the access way indication in the SBC-REQ message in step 903, in this step, described MS/UE can be carried at described access way indication in described NAI.
Need to prove, if described MS/UE request after switching with switch before a plurality of PDN of setting up one or more continuation maintenance connections in being connected, can also carry PDN in described EAP Response/Identity message selects information, described PDN selection information to be used to indicate its request to keep afterwards the PDN that connects in switching.Concrete, described PDN selects information also can expand in described NAI.Select information and the indication of described access way if carry simultaneously described PDN, carry simultaneously two property values pair, define respectively described PDN and select information and the indication of described access way, specifically can be with reference to the appropriate section of implementation step 201 shown in Figure 2.
Authenticator on step 911, described ASN GW and the described NAI of use carry out EAP authentication and licensing process between described MS/UE and described HSS/AAA.Optionally, if carry described access way indication in the described NAI that described Authenticator receives, can parse described access way and indicate and preserve.Further alternative, described Authenticator can with in described NAI { the AT=xxx} item removes, and uses not contain that { NAI of AT=xxx} item is as user's sign in described EAP authentication and licensing process.Certainly, described Authenticator also can use in described EAP authentication and licensing process and contain that { NAI of AT=xxx} item is as user's sign.Described EAP authentication and licensing process adopt prior art to complete, and repeat no more herein.
Carry out DHCP (Dynamic Host ConfigurationProtocol, DHCP) process between described MS/UE and described ASN GW.In described dhcp process, described MS/UE can report the access way indication to network side.Concrete, described MS/UE is in dhcp process, can carry described access way indication in DHCP discover (dynamic host configuration protocol discover, DHCP is found) message or DHCP Request (DHCP request) message or DHCP Solicit message.Optionally, when described access way indication value is handover, can also carry one or more PDN in described DHCP discover message or DHCP Request message or DHCP Solicit message and select information, keep afterwards to indicate its request the PDN that connects in switching.Concrete, carry described access way indication in described DHCP discover message or DHCP Request message or DHCP Solicit message, and further carry the method that described PDN selects information, similar to the appropriate section of embodiment shown in Figure 4 with Fig. 2 respectively.Difference is, in the present embodiment, in one of them of above-mentioned message, must carry described access way indication, and it is optional that described PDN selects information.
MAG/FA on step 914, described ASN GW according to the indication of described access way and described switching before the PDN link information, initiate the MIP registration process.The functional entity that on described ASN GW, responsible MIP registers is MAG or FA.The MIP registration mode of the IP protocol type that the view network is supported and deployment is different, and MAG and FA select one be present in system.If there is MAG in system, represent that network design adopts the PMIPv6 pattern to carry out the MIP registration; If there is FA in system, represent that network design adopts the PMIPv4 pattern to carry out the MIP registration.Concrete, if described access way indication value is initial, the Authenticator on described ASNGW is the PDNGW that described MS/UE selects an acquiescence according to the network design strategy, and by carrying out the MIP registration between described MAG or FA and described PDN GW, the PDN that sets up the network acquiescence for described MS/UE connects.if described access way indication value is handover, and described ASNGW does not receive that the PDN from described MS/UE selects information, described MAG or FA according to the described switching in step 912 before the PDN link information, if before the described switching in step 912, the PDN link information has many groups, Authenticator selects wherein one group, and trigger between corresponding FA or the MAG PDN GW corresponding with selected described PDN link information and carry out the MIP registration, for setting up PDN, described MS/UE connects, described PDN connects the PDN that sets up with described MS/UE and connects identical or one of them before switching.if described access way indication value is handover, and described ASN GW has received that the PDN from described MS/UE selects information, described MAG or FA select information according to described PDN, if described PDN selection information has a plurality of, select one of them PDN to select information, inquire the information of the PDN selection information indication of described selection before described switching from step 912 in the PDN link information, and according to PDN link information before the switching of described selection, carry out the MIP registration between the PDN GW corresponding with described PDN link information, for setting up PDN, described MS/UE connects, described PDN connects the same PDN selection information indication of setting up with described MS/UE before switching PDN connects identical.Concrete MIP registration process all adopts the flow process of existing protocol definition.The PDN that carries in described PDN link information, perhaps corresponding APN and PDN GW address corresponding to described APN are the opposite end PDN of ASN GW in described MIP registration process, and described QoS information namely is used for the QoS information of consulting in described MIP registration process.
So far, as shown in Figure 9, described MS/UE has set up PDN and has connected and corresponding data path in the WiMAX network.
Need to prove, if the PDN that described MS/UE sets up by described access way indication request connects more than one, repeated execution of steps 914 to 915, all register foundation by MIP in the WiMAX network until all PDN that described MS/UE sets up with described access way indication request connect, and set up corresponding data path.
Step 916,3GPP network discharge EPS (Evolved PacketSystem, the evolved packet system) data link of described MS/UE according to prior art.
The method that discloses by using the embodiment of the present invention, described MS/UE can report the access way indication to MAG/FA, described MAG/FA also can obtain PDN link information before described switching from HSS/AAA, and carry out the MIP registration according to PDN link information before described switching and the indication of described access way, to realize that described MS/UE is to the selection of the PDN after switching.Further, described MS/UE can select information by corresponding PDN by the PDN that reports simultaneously its request keep to connect, select with switch before one or more maintenances connections in the PDN that is connected.
The embodiment of the invention discloses a kind of device of selecting packet data network.
As shown in figure 10, described device comprises:
The first receiver module 1000: be used for receiving the access way indication.Concrete, described access way indication can be carried in MS_PreAttachment_Req message, perhaps is carried in the NAI of EAPRequest/Identity message.Further, if also carry PDN selection information in described MS_PreAttachment_Req message or EAP Request/Identity message, described receiver module 1000 also is used for receiving described PDN selection information.
The second receiver module 1002: be used for receiving Access Accept (access is accepted) message from HSS/AAA, carry the information that PDN that described MS/UE sets up connects in described Access Accept message before switching, the present embodiment is called the front PDN link information of switching, be specifically as follows PDN corresponding to PDN connection that described MS/UE sets up before switching, perhaps corresponding APN and PDN GW address corresponding to described APN, also comprise QoS (the Quality of Service) information that each PDN connects.
Mobile Internet Protocol MIP Registering modules 1004: be used for initiating mobile internet protocol MIP registration according to from the described access way indication of described the first receiver module 1000 with from PDN link information before the switching of described the second receiver module 1002.Optionally, if described the first receiver module 1000 has also received described PDN and has selected information, described Mobile Internet Protocol MIP Registering modules 1004 is according to selecting information from the described access way indication of described the first receiver module 1000, described PDN and from PDN link information before the switching of described the second receiver module 1002, initiate the MIP registration, set up the PDN that indicates with described PDN selection information and be connected.Concrete registration process can be with reference to step 914 appropriate section embodiment illustrated in fig. 9.
The described device of the embodiment of the present invention is the access service gateway ASN GW of WiMAX network.
By using the disclosed device of the embodiment of the present invention, Mobile Internet Protocol MIP Registering modules 1004 can be according to the access way indication that comes self terminal of the first receiver module 1000 receptions with from PDN link information before the switching of described the second receiver module 1002, initiate the MIP registration, set up and switch front identical PDN connection for the terminal after described switching, realizing that terminal is to the selection of packet data network.
The embodiment of the present invention has further disclosed a kind of system of selecting packet data network.Described system comprises AAA server AAA1110 and access service gateway 1112 as shown in figure 11, wherein,
Described AAA server AAA1100 is used for sending Access Accept (access is accepted) message to described access service gateway 1102, carry the information that PDN that described MS/UE sets up connects in described Access Accept message before switching, the present embodiment is called the front PDN link information of switching, be specifically as follows PDN corresponding to PDN connection that described MS/UE sets up before switching, perhaps corresponding APN and PDN GW address corresponding to described APN, also comprise QoS (the Quality of Service) information that each PDN connects.
Described access service gateway 1102 is used for receiving the access way indication of self terminal, and from PDN link information before the described switching of AAA server AAA1100, and initiate mobile internet protocol MIP registration according to PDN link information before described access way indication and described switching.Optionally, described access service gateway 1102 also is used for receiving the PDN selection information of self terminal, before selecting information and described switching according to described access way indication, described PDN this moment, the PDN link information is initiated the MIP registration, sets up with the PDN of described PDN selection information indication to be connected.Concrete registration process can be with reference to step 914 appropriate section embodiment illustrated in fig. 9.
By the disclosed system of the application embodiment of the present invention, described AAA server AAA1100 can send to access service gateway 1102 with PDN link information before switching, described access service gateway 1102 can also receive the access way indication of self terminal, optionally, can also receive the PDN of self terminal to select information, and initiate the MIP registration according to PDN link information before described access way indication and described switching, the PDN that sets up terminal request connects, and realizes that terminal is to the selection of packet data network.
By using the disclosed methods, devices and systems of the embodiment of the present invention, PDN that can the receiving terminal report selects information, and selecting information and PDN subscription information according to described PDN is that terminal is selected PDN GW, makes terminal realize selection to packet data network.Further, if switching from the 3GPP Access Network, described terminal enters the WiMAX Access Network, the disclosed methods, devices and systems of the embodiment of the present invention can also make terminal with the access way order report to network side, make network side be designated as described terminal distribution PDN GW address according to described access way, the MS/UE that cross-over connection networking system is switched can realize the selection to the packet data network that needs after switching to keep to connect.
Above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (14)
1. a method of selecting packet data network, is characterized in that, the method comprises:
Anchor ASN-GW receives the DHCP discover message of self terminal, carries PDN selection information in described DHCP discover message;
Send the PDN authorization request message to authentication device, carry described PDN in described PDN authorization request message and select information, so that described authentication device is that described terminal is selected grouped data network gateway PDN GW according to PDN subscription information and the described PDN selection information of the described terminal of self preserving.
2. the method for claim 1, is characterized in that,
Also carry the access way indication in described DHCP discover message;
Also carry described access way indication in described PDN authorization request message;
Described authentication device is selected information according to PDN subscription information and the described PDN of the described terminal of self preserving, and described access way is designated as described terminal selection grouped data network gateway PDN GW.
3. method as claimed in claim 2, is characterized in that, if described access way indication value is switching, the address of described PDN GW is the address of PDN GW described PDN selection information indication, that described terminal has connected before switching.
4. as the either method of claims 1 to 3, it is characterized in that, further comprise step:
Described anchor ASN-GW receives the PDN authorization response message from described authentication device, the address of carrying described PDN GW in described PDN authorization response message.
5. a method of selecting packet data network, is characterized in that, the method comprises:
Access service gateway ASN GW receives the DHCP discover message of self terminal, carries PDN selection information in described DHCP discover message;
Be that described terminal is selected grouped data network gateway PDN GW according to PDN subscription information and the described PDN selection information of the described terminal of self preserving.
6. method as claimed in claim 5, is characterized in that,
Also carry the access way indication in described DHCP discover message;
Described ASN GW selects information according to PDN subscription information and the described PDN of the described terminal of self preserving, and described access way is designated as described terminal selection grouped data network gateway PDN GW.
7. method as claimed in claim 6, is characterized in that, if described access way is designated as switching, described PDN GW address is described PDN selection information indication, the address of the PDN GW that described terminal has connected before switching.
8. the device of an assisted Selection packet data network, is characterized in that, comprising:
The first receiver module: be used for receiving the DHCP discover message of self terminal, carry PDN selection information in described DHCP discover message;
The first sending module: be used for sending the PDN authorization request message to authentication device, the described PDN that carries in described PDN authorization request message from described the first receiver module selects information, so that described authentication device is that described terminal is selected grouped data network gateway PDN GW according to PDN subscription information and the described PDN selection information of the described terminal of self preserving.
9. device as claimed in claim 8, is characterized in that,
Described the first receiver module also is used for receiving the access way indication that described DHCP discover message is carried;
Described the first sending module is used for that also described access way indication is carried at described PDN authorization request message and sends to described authentication device, so that the PDN subscription information of the described terminal that described authentication device is preserved according to self and described PDN select information, and described access way is designated as described terminal and selects grouped data network gateway PDN GW.
10. install as claimed in claim 8 or 9, it is characterized in that, also comprise:
The second receiver module: be used for receiving the PDN authorization response message from described authentication device, carrying network side in described PDN authorization response message is the address of the PDN GW of described terminal distribution.
11. a device of selecting packet data network is characterized in that, comprising:
Receiver module: be used for receiving the DHCP discover message that carries PDN selection information of self terminal, perhaps select the PDN authorization request message of information from the described PDN of carrying of anchor ASN-GW;
Preserve module: the PDN subscription information that is used for preserving described terminal;
PDN selection functional module: be used for selecting information and being that described terminal is selected grouped data network gateway PDN GW from the described PDN subscription information of described preservation module according to the described PDN from described receiver module.
12. device as claimed in claim 11 is characterized in that,
Described receiver module also is used for receiving the access way indication that described DHCP discover message is carried;
Described PDN selection functional module is used for selecting information and the indication of described access way according to the described PDN from described receiver module, and is that described terminal is selected grouped data network gateway PDN GW from the described PDN subscription information of described preservation module.
13. a system of selecting packet data network is characterized in that described system comprises anchor ASN-GW and authentication device, wherein,
Described anchor ASN-GW is used for receiving the DHCP discover message of self terminal, carry PDN selection information in described DHCPdiscover message, send the PDN authorization request message to authentication device, carry described PDN in described PDN authorization request message and select information;
Described authentication device is used for according to the PDN subscription information of the described terminal of self preserving and is that described terminal is selected grouped data network gateway PDN GW from the described PDN selection information of described anchor ASN-GW.
14. system as claimed in claim 13 is characterized in that,
Described anchor ASN-GW also is used for receiving the access way indication that described DHCP discover message is carried, and described access way indication is carried in described PDN authorization request message sends to described authentication device;
Described authentication device is used for selecting information and the indication of described access way according to the described PDN from described anchor ASN-GW, and the described PDN subscription information of self preserving is that described terminal is selected PDN GW.
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