CN101047710B - Method for implementing terminal denetwork at agent mobile network protocol - Google Patents
Method for implementing terminal denetwork at agent mobile network protocol Download PDFInfo
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- CN101047710B CN101047710B CN200610073445A CN200610073445A CN101047710B CN 101047710 B CN101047710 B CN 101047710B CN 200610073445 A CN200610073445 A CN 200610073445A CN 200610073445 A CN200610073445 A CN 200610073445A CN 101047710 B CN101047710 B CN 101047710B
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Abstract
This invention discloses a realizing method for quitting of terminals under PMIP including: when a terminal quits, an anchor proxy moves IP customer end to delete context information of said terminal kept locally and sends an session release instruction to an access gateway , which receives the instruction and releases the current resource of the terminal locally to send data channel release instruction to said service base station, which releases the resources distributed to the terminal before and context kept and sends quitting response information to the terminal.
Description
Technical field
The present invention relates to the wireless access network technology, be meant a kind of especially in the implementation method of acting on behalf of terminal exiting network under the mobile IP (PMIP).
Background technology
Extensive use along with internet (Internet) professional flourish and wireless network, and along with the increase of increase of number of mobile users purpose and user's request is GPRS (GPRS, GeneralPacketRadioService), third generation mobile (3G), micro-wave access to global intercommunication (WiMAX, Worldwide Interoperability Microwave Access) and back 3G (B3G, Beyond 3G) etc. wireless system provides new demand, i.e. requirement can be supported big capacity, the multiple business that big data quantity and different service quality require.
Wireless access network is as the bridge between wireless user and existing cable network or other business networks, and mainly finishing provides business to provide Packet Service between network and the mobile subscriber to transmit or the function of route.
With the WiMAX network is that example describes, and does not consider other internal units in the Access Network, and WiMAX network architecture system is referring to shown in Figure 1.Mainly comprise travelling carriage (MS, Mobile SubscribeStation), access service network (ASN, Access Service Network) and connectivity serving network (CSN, Connectivity Service Network) three parts.
The functional interpretation of each network element among Fig. 1 is as follows:
MS:MS is a mobile subscriber equipment, and the user uses this devices accessing WiMAX network.
ASN:ASN is the network function set that the wireless access service is provided for the WiMAX terminal, has comprised base station (BS, Base Station) and access service network gateway (ASN-GW, AccessService Network GateWay) network element among the ASN.Wherein,
The function of BS comprises: provide the L2 of BS and MS to be connected, functions such as the compression of RRM, measurement and power control, the data of eating dishes without rice or wine and encryption.
The function of ASN-GW comprises: for MS authentication function provides agency (proxy) function, and anchor authentication (Anchor Authenticator) functional entity; Support the network of NSP to find and selection; The Relay function (as IP address assignment) of L3 information is provided for MS; And RRM etc.
ASN-GW can also comprise following non-essential functional entity except above-mentioned functions:
Switching control function entity in the ASN;
MS paging and location management are as the paging controller PC functional entity;
Tunnel management functional entity between the ASN-CSN is equivalent to mobile Internet Protocol (IP, the InternetProtocol) external agent in the technology (FA), and anchor proxy mobile IP customer terminal (Anchor PMIPClient) functional entity; And
The vision location registration, anchor service flow authorized entity (Anchor SFA) functional entity.
Functional entity in the above ASN-GW, because of moving along with terminal, be different the opportunity that they trigger change separately, thereby can cause serving above each functional entity of specific MS, as AnchorAuthenticator, external agent (FA), therefore Anchor SFA, Anchor PMIP Client etc. may be present in the different ASN-GW, in activity once, will relate to mutual between each different ASN-GW.
CSN:CSN provides Internet protocol (IP) Connection Service for the WiMAX terminal.The function that CSN mainly provides comprises: the IP address assignment of MS; Internet inserts; AAA proxy or server; Authorization control based on the user; ASN is equivalent to the home agent (HA) in the mobile IP technology to the tunnel of CSN; WiMAX user's charging and the clearing between the operator; Tunnel under the roaming condition between the CSN; Switching between the ASN; Various WiMAX services, as: location-based business, multi-medium multi-packet broadcasting and broadcasting service, IP Multimedia System business.
The WiMAX network uses mobile IP technology, for mobile IP technology, according to the client (Client) of mobile IP (MIP) in terminal still at network side, can be divided into client mobile IP (CMIP) and proxy-mobile IP (PMIP).For CMIP, the registration of mobile IP and go to register all and initiate by terminal; For PMIP, the registration of mobile IP and go to register by network side and initiate.
Network technology generally also can be divided into the terminal initiation and network side is initiated and for moving back.The reason that net is moved back in common terminal initiation mainly is a power-off operation.The reason that net is moved back in the network side initiation mainly contains: capture terminal abnormal and fall net; Perhaps based on the heavier situation of resource load, find that simultaneously this MS does not have under the service conditions for a long time, the initiator can be SFM or Anchor SFA.Yet, in the existing wireless access network standard, do not provide any solution of moving back network technology.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of under PMIP the implementation method of terminal exiting network, solve and initiating moving back net, and initiate to move back the net problem of moving back under the net situation by the SFM of network side or Anchor SFA by terminal.
The present invention proposes a kind ofly based on above-mentioned purpose, may further comprise the steps in the implementation method of acting on behalf of terminal exiting network under the mobile IP:
When A. terminal is moved back net, the contextual information of the local described terminal that keeps of anchor proxy mobile IP customer terminal deletion, and the transmission session discharges indication to the Access Network gateway;
B. after the Access Network gateway receives that session discharges indication, discharge the resource of current terminal correspondence in this locality, send data channel and discharge indication to serving BS;
C. serving BS is released to the resource of being distributed before this terminal and the context of reservation, and sends to terminal and to move back the net response.
The described exiting network process of this method is initiated by terminal, and steps A takes a step forward and may further comprise the steps:
A. terminal sends the net request of moving back to the serving BS at self place, serving BS receive self terminal move back the net request after, send the data channel that carries this terminal iidentification and move back the net indication and discharge request to the Access Network gateway;
B. after the Access Network gateway is received described release request, according to moving back the net indication, to the anchor proxy mobile IP customer terminal transmission session release request of this terminal;
C. after the anchor proxy mobile IP customer terminal receives that session discharges request, find the mobile IP cipher key information of this terminal, encapsulate what a mobile IP login request and send to described Access Network gateway, Access Network gateway forwards mobile IP login request is given home agent;
D. after home agent is received mobile IP login request, verify the legitimacy of this request, and reply mobile IP registration and answer the Access Network gateway that Access Network gateway forwards mobile IP registration is answered the anchor proxy mobile IP customer terminal;
The anchor proxy mobile IP customer terminal is received mobile IP registration answer back execution in step A;
Wherein, the session that sends to the Access Network gateway of the proxy mobile IP customer terminal of anchor described in the steps A discharges and to be designated as session and to discharge response;
Among the described step B, the session that described Access Network gateway is received discharges and is designated as described session release response.
The described exiting network process of this method is initiated by network side, and steps A takes a step forward and may further comprise the steps:
A '. after the network side triggering terminal was moved back net, the Access Network gateway received and moves back net indication, according to moving back the net indication, sent session to the Access Network gateway at the anchor proxy mobile IP customer terminal place of this terminal and discharged request;
B '. after the anchor proxy mobile IP customer terminal receives that session discharges request, find the key information of the relevant PMN-HA of this terminal, encapsulate what a mobile IP login request and send to described Access Network gateway, Access Network gateway forwards mobile IP login request is given home agent;
C '. after home agent is received mobile IP login request, verify the legitimacy of this request, and reply mobile IP registration and answer the Access Network gateway that Access Network gateway forwards mobile IP registration is answered the anchor proxy mobile IP customer terminal;
The anchor proxy mobile IP customer terminal is received mobile IP registration answer back execution in step A;
Wherein, the session that sends to the Access Network gateway of the proxy mobile IP customer terminal of anchor described in the steps A discharges and to be designated as session and to discharge response;
After the described Access Network gateway of step B received that described session discharges response, the resource that discharges described current terminal correspondence took a step forward and comprises: d '. and transmission carries this terminal iidentification and moves back the data channel of netting indication and discharges request to the serving BS of waiting to move back network termination;
E '. serving BS is replied data channel to IAD and is discharged response;
F '. after the Access Network gateway receives that data channel discharges response, discharge the resource of current terminal correspondence in this locality, reply data channel release and confirm to give serving BS.
The described data channel of this method discharges in the request and further comprises: the sign of anchor authentication functions entity and or the sign of charging proxy.
This method discharges the operation of the resource of current terminal and is carried out by the external agent in the Access Network gateway, the service Access Network gateway that is connected with serving BS is not the anchor networking gateway at described external agent place, and step b comprises: the release request that described service Access Network gateway will receive sends to the anchor networking gateway at described external agent place; After the described release request that described anchor networking gateway receives, according to moving back the net indication, to the anchor proxy mobile IP customer terminal transmission session release request of this terminal;
The described Access Network gateway of step B sends the data channel release process to described serving BS of indicating and comprises: the anchor networking gateway at described external agent place is replied data channel and is discharged the service IAD that Current Serving BTS connected of response to current terminal.
This method discharges the operation of the resource of current terminal and is carried out by the external agent in the Access Network gateway, the service Access Network gateway that is connected with serving BS is not the anchor networking gateway at described external agent place, steps d ' the described transmission process that discharges request further comprises: the release request that the anchor networking gateway at described external agent place will receive sends to the service IAD that Current Serving BTS connected of waiting to move back network termination;
Step e ' further comprises: described service IAD is replied data channel and is discharged the anchor networking gateway that described external agent place is given in response;
The described answer data channel of step f ' discharges confirms to give serving BS further to comprise: the release that the anchor networking gateway at described external agent place will receive confirms to send to the service IAD that Current Serving BTS connected of waiting to move back network termination.
This method carries in described mobile IP login request in order to represent that mobile IP goes the information of registration process.
Further comprise behind this method step C: serving BS is replied data channel and is discharged affirmation to the Access Network gateway.
The described serving BS of this method step C is that the terminal resource of distributing and the context of reservation comprise: safe context and state machine, service flow context and state machine.
Further comprise behind this method step C: IAD sends the R3 session and discharges all contextual informations of confirming to require corresponding this current terminal of deletion to the anchor authentication functions entity of current terminal correspondence.
Further comprise behind this method step C: if remain with the safe context of terminal in authentication, authentication and the billing function entity, then anchor authentication functions entity notification authentication, authentication and the billing function entity of terminal are informed terminal exiting network, require the safe context information of deletion terminal; Strategic server is deleted and will be returned service flow authorized entity position to anchor service flow authorized entity behind the contextual information of described terminal and upgrade response.
Further comprise behind this method step C: the Access Network gateway sends the request of chargeing that stops according to moving back the Access Network gateway of net indication to the charging proxy place of this terminal; Charging proxy notification authentication, authentication and billing function entity stop to charge; The Access Network gateway at charging proxy place returns to stop chargeing to anchor networking gateway and replys.
From above as can be seen, the present invention has creatively proposed the solution of terminal exiting network under PMIP, can make things convenient for, be implemented in flexibly, efficiently the terminal exiting network under the PMIP by the present invention.
Description of drawings
Fig. 1 is existing WiMAX network architecture schematic diagram;
Fig. 2 is the schematic flow sheet by terminal exiting network method preferred embodiment under the PMIP of terminal initiation provided by the invention;
Fig. 3 is for moving back the schematic flow sheet of network method preferred embodiment under the PMIP by the network side initiation provided by the invention.
Embodiment
Below in conjunction with drawings and the specific embodiments technical solution of the present invention is elaborated.
Of the present invention a kind of in the implementation method of acting on behalf of terminal exiting network under the mobile IP PMIP, mainly comprise: when terminal is moved back net, the contextual information of the local described terminal that keeps of anchor proxy mobile IP customer terminal deletion, and send session release indication to the Access Network gateway; After the Access Network gateway receives that session discharges indication, discharge the resource of current terminal correspondence in this locality, send data channel and discharge indication to described serving BS; Serving BS is released to the resource of being distributed before this terminal and the context of reservation, and sends to terminal and to move back the net response.
Referring to shown in Figure 2, be example with the WiMAX network, the PMIP terminal exiting network flow process of being initiated by MS of preferred embodiment of the present invention may further comprise the steps:
Step 207 after HA receives, is verified the legitimacy of this message, and replys MIP registration answer message MIP Registration Reply to FA.
Step 208, FA transmits MIP Registration Reply message to Anchor PMIP Client.
Step 209, Anchor PMIP Client deletes some contextual informations of this MS of its reservation; And reply R3 session release response message R3 Session Release Response and give FA.
Optionally, if current have business chargeing, Anchor ASN-GW/FA sends to the ASN-GW at the Accounting of this terminal Client place and stops charging request message; Further, Accounting Client sends to AAA and stops charging message Account-Request/Stop; Then, the ASN-GW at Accounting Client place returns the termination charge response message to described Anchor ASN-GW.
Step 212, serving BS broadcasts is replied MS and is moved back net response message DREG_CMD, and wherein Action Code=04 represents that MS stops and all services of current BS, moves back and nets successfully.
Optionally, for the IP address of dynamic assignment, FA notifies DHCP Proxy to initiate IP address release flow process simultaneously, and DHCP Proxy sends DHCP Release Request message to DHCP Server.Optionally, for the IP address of dynamic assignment, after net was moved back in the MS triggering, transmission DREG_REQ message was represented to move back net and is carried out DHCP Release process before and between the DHCP Server; Optionally, do not carry out IP address dispose procedure, go to guarantee by the aging mechanism in the DHCP server, at the lifetime of IP address to after date, release automatically.
In the above step, if there is no Anchor ASN-GW, then serving ASN-GW is exactly the Anchor ASN-GW of current service BS, and the interaction flow of then above-mentioned service ASN-GW and Anchor ASN-GW does not just exist, such as the related content of mentioning in the above-mentioned steps 203,210,214; When simultaneously if each Anchor functional entity above-mentioned has in same physical entity, be inner primitive alternately between them then.
Comprising also in the process that each network entity discharges the MS context and the resource of correspondence, is the CID that MS distributes as BS inside, the AK of reservation and AK context, SAID, security information contexts such as TEK; And the SFID in Anchor SFA or the PF, PMK and AK in the Authenticator, all safe contexts such as Ak context.Whether data channel removes depends on the granularity of setting up data channel, if data channel is based on that BS sets up then terminal exiting network process need not removed data channel, only needs to discharge the MS context and respective resources gets final product; Otherwise the companion data passage is removed in the exiting network process.
Referring to shown in Figure 3, the present invention be may further comprise the steps by the preferred embodiment of the PMIP terminal exiting network flow process that network side is initiated:
More than two steps are possibilities.After the 1st step, serving BS broadcasts received the Path De-Registration Ack message of service ASN-GW in can step below, initiatively send DREG_CMD (Action Code=04) and require to move back net to MS to MS; Be that MS moved back net by the serving BS broadcasts notice after network side was finished all Data Path releases and resource dispose procedure.
Step 305, FA transmits MIP Registration Request message, carries Lifetime=0 to HA.
Step 306 after HA receives, is verified the legitimacy of this message, and replys MIP RegistrationReply message to FA.
Step 307, FA transmits MIP Registration Reply message to Anchor PMIP Client.
Step 308, Anchor PMIP Client deletes some contextual informations of this MS of its reservation; And reply R3 Session Release Response and give FA.
Optionally, if current have business chargeing, Anchor ASN-GW/FA sends to the ASN-GW at the Accounting of this terminal Client place and stops charging request message; Further, Accounting Client sends to AAA and stops charging message Account-Request/Stop; Then, the ASN-GW at Accounting Client place returns the termination charge response message to described Anchor ASN-GW.
After step 315, serving BS broadcasts receive the Path De-Registration Ack message of service ASN-GW, initiatively send DREG_CMD (Action Code=04) and require to move back net to MS to MS; Be that MS moved back net by the serving BS broadcasts notice after network side was finished all Data Path releases and resource dispose procedure.
Optionally, for the IP address of dynamic assignment, also can notify DHCPProxy to initiate the IP address in this step by FA and discharge flow process, DHCP Proxy sends DHCP Release Request message to DHCP Server.Optionally, do not carry out IP address dispose procedure, go to guarantee by the aging mechanism in the DHCP server, at the Lifetime of IP address to after date, release automatically.
In the above step, if there is no Anchor ASN-GW, then serving ASN-GW is exactly the Anchor ASN-GW of current service BS, and the interaction flow of then above-mentioned service ASN-GW and Anchor ASN-GW does not just exist, such as the related content of mentioning in the above-mentioned steps 309,312,313; When simultaneously if each Anchor functional entity above-mentioned has in same physical entity, be inner primitive alternately between them then.
Comprising also in the process that each network entity discharges the MS context and the resource of correspondence, is the CID that MS distributes as BS inside, the AK of reservation and AK context, SAID, security information contexts such as TEK; And the SFID in Anchor SFA or the PF, PMK and AK in the Authenticator, all safe contexts such as Ak context. whether data channel is removed and is depended on the granularity of setting up data channel, if data channel is based on that BS sets up then terminal exiting network process need not removed data channel, only need release MS context and respective resources to get final product; Otherwise the companion data passage is removed in the exiting network process.
Be example with the WiMAX system in the foregoing description, but technology provided by the present invention include but not limited to the application in the WiMAX system.
In a word, the above only is preferred embodiment, is not in order to limit the present invention.
Claims (12)
1. one kind in the implementation method of acting on behalf of terminal exiting network under the mobile IP, it is characterized in that, may further comprise the steps:
When A. terminal is moved back net, the contextual information of the local described terminal that keeps of anchor proxy mobile IP customer terminal deletion, and the transmission session discharges indication to the Access Network gateway;
B. after the Access Network gateway receives that session discharges indication, discharge the resource of current terminal correspondence in this locality, send data channel and discharge indication to serving BS;
C. serving BS is released to the resource of being distributed before this terminal and the context of reservation, and sends to terminal and to move back the net response.
2. method according to claim 1 is characterized in that described exiting network process is initiated by terminal, and steps A takes a step forward and may further comprise the steps:
A. terminal sends the net request of moving back to the serving BS at self place, serving BS receive self terminal move back the net request after, send the data channel that carries this terminal iidentification and move back the net indication and discharge request to the Access Network gateway;
B. after the Access Network gateway is received described release request, according to moving back the net indication, to the anchor proxy mobile IP customer terminal transmission session release request of this terminal;
C. after the anchor proxy mobile IP customer terminal receives that session discharges request, find the mobile IP cipher key information of this terminal, encapsulate what a mobile IP login request and send to described Access Network gateway, Access Network gateway forwards mobile IP login request is given home agent;
D. after home agent is received mobile IP login request, verify the legitimacy of this request, and reply mobile IP registration and answer the Access Network gateway that Access Network gateway forwards mobile IP registration is answered the anchor proxy mobile IP customer terminal;
The anchor proxy mobile IP customer terminal is received mobile IP registration answer back execution in step A;
Wherein, the session that sends to the Access Network gateway of the proxy mobile IP customer terminal of anchor described in the steps A discharges and to be designated as session and to discharge response:
Among the described step B, the session that described Access Network gateway is received discharges and is designated as described session release response.
3. method according to claim 1 is characterized in that described exiting network process is initiated by network side, and steps A takes a step forward and may further comprise the steps:
A '. after the network side triggering terminal was moved back net, the Access Network gateway received and moves back net indication, according to moving back the net indication, sent session to the Access Network gateway at the anchor proxy mobile IP customer terminal place of this terminal and discharged request;
B '. after the anchor proxy mobile IP customer terminal receives that session discharges request, find the key information of the relevant PMN-HA of this terminal, encapsulate what a mobile IP login request and send to described Access Network gateway, Access Network gateway forwards mobile IP login request is given home agent;
C '. after home agent is received mobile IP login request, verify the legitimacy of this request, and reply mobile IP registration and answer the Access Network gateway that Access Network gateway forwards mobile IP registration is answered the anchor proxy mobile IP customer terminal;
The anchor proxy mobile IP customer terminal is received mobile IP registration answer back execution in step A;
Wherein, the session that sends to the Access Network gateway of the proxy mobile IP customer terminal of anchor described in the steps A discharges and to be designated as session and to discharge response;
After the described Access Network gateway of step B received that session discharges response, the resource that discharges described current terminal correspondence took a step forward and comprises: d '. and transmission carries this terminal iidentification and moves back the data channel of netting indication and discharges request to the serving BS of waiting to move back network termination;
E '. serving BS is replied data channel to IAD and is discharged response;
F '. after the Access Network gateway receives that data channel discharges response, discharge the resource of current terminal correspondence in this locality, reply data channel release and confirm to give serving BS.
4. according to claim 2 or 3 described methods, it is characterized in that described data channel discharges in the request and further comprises: the sign of anchor authentication functions entity and/or the sign of charging proxy.
5. method according to claim 2, it is characterized in that, the operation that discharges the resource of current terminal is carried out by the external agent in the Access Network gateway, the service Access Network gateway that is connected with serving BS is not the anchor networking gateway at described external agent place, and step b comprises: the release request that described service Access Network gateway will receive sends to the anchor networking gateway at described external agent place; After the described release request that described anchor networking gateway receives, according to moving back the net indication, to the anchor proxy mobile IP customer terminal transmission session release request of this terminal;
The described Access Network gateway of step B sends the data channel release process to described serving BS of indicating and comprises: the anchor networking gateway at described external agent place is replied data channel and is discharged the service IAD that Current Serving BTS connected of response to current terminal.
6. method according to claim 3, it is characterized in that, the operation that discharges the resource of current terminal is carried out by the external agent in the Access Network gateway, the service Access Network gateway that is connected with serving BS is not the anchor networking gateway at described external agent place, steps d ' the described transmission process that discharges request further comprises: the release request that the anchor networking gateway at described external agent place will receive sends to the service IAD that Current Serving BTS connected of waiting to move back network termination;
Step e ' further comprises: described service IAD is replied data channel and is discharged the anchor networking gateway that described external agent place is given in response;
The described answer data channel of step f ' discharges confirms to give serving BS further to comprise: the release that the anchor networking gateway at described external agent place will receive confirms to send to the service IAD that Current Serving BTS connected of waiting to move back network termination.
7. according to claim 2 or 3 described methods, it is characterized in that, in described mobile IP login request, carry in order to represent that mobile IP goes the information of registration process.
8. method according to claim 1 is characterized in that, further comprises behind the step C: serving BS is replied data channel and is discharged affirmation to the Access Network gateway.
9. method according to claim 1 is characterized in that, the described serving BS of step C is that the terminal resource of distributing and the context of reservation comprise: safe context and state machine, service flow context and state machine.
10. method according to claim 1 is characterized in that, further comprises behind the step C: IAD sends the R3 session and discharges all contextual informations of confirming to require corresponding this current terminal of deletion to the anchor authentication functions entity of current terminal correspondence.
11. method according to claim 1, it is characterized in that, further comprise behind the step C: if remain with the safe context of terminal in authentication, authentication and the billing function entity, then anchor authentication functions entity notification authentication, authentication and the billing function entity of terminal are informed terminal exiting network, require the safe context information of deletion terminal; Strategic server will return service flow authorized entity position to anchor service flow authorized entity and upgrade response behind the contextual information of the described terminal of deletion.
12. according to claim 2 or 3 described methods, it is characterized in that, further comprise behind the step C: the Access Network gateway sends the request of chargeing that stops according to moving back the Access Network gateway of net indication to the charging proxy place of this terminal; Charging proxy notification authentication, authentication and billing function entity stop to charge; The Access Network gateway at charging proxy place returns to stop chargeing to anchor networking gateway and replys.
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PCT/CN2007/000977 WO2007109995A1 (en) | 2006-03-27 | 2007-03-27 | Method for a terminal to quit a network and mobile communication system |
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CN101577634B (en) * | 2008-05-07 | 2012-01-25 | 华为技术有限公司 | Network-quitting method, network side management device and network system of multi-host system |
CN101742461B (en) | 2008-11-26 | 2013-08-07 | 中兴通讯股份有限公司 | Method for releasing virtual connection in interoperable network |
CN101778474B (en) * | 2009-01-08 | 2014-03-19 | 中兴通讯股份有限公司南京分公司 | Method for releasing resources on gateway of home base station |
CN101888594B (en) * | 2009-05-15 | 2014-03-12 | 中兴通讯股份有限公司 | Method and system for releasing multicast broadcast data channel |
CN102160339A (en) * | 2009-05-26 | 2011-08-17 | 上海贝尔股份有限公司 | Method for releasing mobile station resource in proxy mobile ip and apparatus thereof |
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CN1423910A (en) * | 2000-01-10 | 2003-06-11 | 高通股份有限公司 | Method and wireless system for terminating a dormant mode in a packet data session |
CN1549619A (en) * | 2003-05-15 | 2004-11-24 | 北京三星通信技术研究有限公司 | Method for notifying equipment service finishing to users |
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