CN101938728B - Method and system for realizing emergency session handover - Google Patents
Method and system for realizing emergency session handover Download PDFInfo
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- CN101938728B CN101938728B CN200910088615.3A CN200910088615A CN101938728B CN 101938728 B CN101938728 B CN 101938728B CN 200910088615 A CN200910088615 A CN 200910088615A CN 101938728 B CN101938728 B CN 101938728B
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Abstract
The invention provides a method and a system for realizing emergency session handover. In the method and the system, (3rd generation partnership project) 3GPP access network serving as a source access network and a target access are both uniquely provided with the same packet data network gateway (PDN GW) used for emergency handover; the 3GPP access network establishes an emergency bearing by using the PDN GW and performs an IMS emergency session on the emergency bearing; and when user equipment (UE) initializes the emergency handover from the 3GPP access network to the target access network, the target access network has a uniquely configured PDN GW for selection. Therefore, the method and the system ensure the sameness of the PDN GW used by the 3GPP access network and the target access network, ensure that the handover of an emergency section from the 3GPP access network to the target access network is realized by UE successfully, realize the continuity of the emergency session, improve service quality and improve user experience.
Description
Technical field
The present invention relates to IP Multimedia System (IMS, IP Multimedia Core Network Subsystem) territory urgent call technology, espespecially a kind of method and system realizing emergent session and switch.
Background technology
Along with network architecture flattening development, and multiple high-speed wideband moves the appearance of access way, and a kind of grouping evolution system (EPS, the Evolved Packet System) network accessing means as IMS domain is applied gradually.
Third generation partner program (3GPP) EPS mainly comprises: the universal land radio access web (E-UTRAN of evolution, Evolved Universal Terrestrial Radio Access Network), mobile management unit (MME, Mobility Management Entity), gateway (S-GW, ServingGateway), data network gateway (P-GW, Packet Data Network Gate Way, also referred to as PDNGW), home subscriber server (HSS, Home Subscriber Server), 3GPP authentication, authorize and accounting server (AAA, Authentication Authorization and Accounting), "Policy and Charging Rules Function entity (PCRF, Policy and Charging Rules Function) and other supporting network element device.
Namely the intercommunication of EPS network support and non-3 GPP network supports the access of non-3 gpp IP Access Network.Fig. 1 is the mutual system architecture schematic diagram of EPS network and non-3 GPP access network cross winding, as shown in Figure 1, this system architecture comprises 3GPP and accesses (i.e. EPS network) and non-3 GPP access two parts, wherein, non-3 GPP access part can be divided into trusted non-3 gpp IP Access Network and trustless non-3 gpp IP Access Network.Trusted non-3 gpp IP Access Network can be directly connected with PDN GW by S2a interface; Trustless non-3 gpp IP Access Network is connected with the PDN GW of EPS network through the data gateway (ePDG, Evolved Packet Data Gateway) of evolution, and wherein, the interface between ePDG and PDN GW is S2b interface.As shown in Figure 1, the intercommunication of EPS network and non-3 GPP access network is by S2a/b/c Interface realization, and PDN GW is the anchor point between 3GPP access and non-3 GPP access network.
In the scheme that 3GPP provides, preferably support the intercommunication of 3GPP EPS access network and 3GPP2 CDMA2000 network.Fig. 2 is the mutual system architecture schematic diagram of EPS access network and CDMA access network, as shown in Figure 2, this system architecture comprises 3GPP and accesses (i.e. EPS network) and CDMA2000 access network two parts, wherein, the medium surface high-speed packet data service gateway (HSGW of CDMA2000 access network, High Rate Packet Serving Gateway) be directly connected with PDN GW by S2a interface, meanwhile, optimize S103 interface and be connected with S-GW; The control network element of CDMA2000 and high-speed packet data network unit (HRPD, High Rate Packet Data) be directly connected with MME by S101 interface, S101 signaling tunnel transparent transmission terminal can set up signaling message such as grade to the attachment of HRPD with carrying.
The medium surface HSGW intercommunication of EPS network and CDMA2000 access network is by S2a/S103 Interface realization, also optimally define the control signal interface S101 of the control unit of EPS and the control unit of MME and CDMA 2000 and HRPD in addition, interface is based on tunnel protocol, can the information of control signal of transparent transmission terminal and objective network, MME also can insert the control information of source access network in the signaling.By source access network control channel on S101, UE again adheres at CDMA2000 access network and sets up carrying, can ensure that handoff procedure is minimum for the impact of source and destination network like this, the minimum and service terminal minimal time of coupling.System adopts PDN GW as the anchor point between 3GPP access and CDMA2000 access network equally.
Urgent call (Emergency Call) is distinctive a kind of voice service function in mobile communication system.Even if be provided with restriction at mobile terminal breathe out and do not insert subscriber identification module (SIM, SubscriberIdentity Module) when, as long as in the region that mobile network covers, when user dial emergency numbers as 110,119,911 etc. after, calling can forward corresponding urgency communication to and accept center (PSAP, PublicSafety Answering Point), such as: police office, fire brigade, first-aid centre etc., to provide the emergency assistance services of 24 hours.Generally speaking, urgent call is all realize in circuit switching (CS, Circuit Switch) territory (also can referred to as circuit domain).
Along with the IPization of network, packet switching (PS, Packet Switch) territory also starts to support emergence call service, and on PS territory by IMS carry out call signaling control realize urgent call.Usually, the emergence call service that IMS domain provides can referred to as IMS urgent call.IMS urgent call needs in non-3 gpp IP access network or EPS access network, realize IP carrying.Therefore, need to support that emergent session switches in the session of non-3 gpp IP access network and 3GPP access network switches.
To support and CDMA2000 network intercommunication 3GPP network in, suppose a certain subscriber equipment (UE, User Equipment) at access this CDMA2000 access network when carrying out emergent session, owing to moving to the region at CDMA2000 access network place, emergent session is needed to be switched to CDMA2000 access network, Fig. 3 is that UE is linked into the emergent session switching flow figure of CDMA2000 access from 3GPP, and as shown in Figure 3, this switching flow mainly comprises the steps:
Step 300:UE initiates emergency attached request to eNodeB, carries the information such as the mark of UE, emergency type, the network accessibility of UE, the instruction of request dispatching IP in this emergency attached request.
UE needs to set up emergency bearing at EPS access network, then on emergency bearing, initiates IMS emergent session before initiating emergent session.
Step 301:eNodeB is that UE selects one for the MME of its service, and this emergency attached request is forwarded to this MME.
According to information such as emergency types, step 302:MME judges that the request received is emergency attached request, skip the steps such as authentication, one is selected for the local PDN GW of urgency traffic service, as the packet gateway server of emergency bearing in the database of MME static configuration.
Step 303:MME is that UE selects a S-GW, and sets up emergency bearing request to its transmission.This sets up the information such as mark, the instruction for UE distributing IP address, default bandwidth information, PDN GW address of the mark carrying UE in emergency bearing request, urgent mark, MME.
Step 304:S-GW sends to PDN GW and sets up emergency bearing request.This is set up the address carrying S-GW in emergency bearing request, default bandwidth information, is the information such as the instruction of UE distributing IP address, urgent mark.
Step 305: if needed, the decision informations such as the tactful and charging regulation of the emergency services quality (QoS) that PDN GW configures for this UE to PCRF request.
The urgent qos policy that step 306:PDN GW returns according to PCRF and charging decisions information, set up emergency bearing, and return to S-GW and set up emergency bearing response.
Step 307:S-GW sends to MME and sets up emergency bearing response.
Step 308:MME sends emergency attached response to eNodeB, shows that UE emergency attached is accepted to the request of network.
Step 309: complete wireless heterogeneous networks.Roughly comprise: eNodeB sends voice emergency bearing to UE and sets up request, require that UE preserves the important information of emergency bearing foundation, and open corresponding port.Wherein, the IP address, bandwidth information etc. of UE is set up in request and carry bearer network ID, PDN GW address, distributed to above-mentioned voice bearer; After radio bearer is set up, UE sends voice emergency bearing to eNodeB and sets up response.
Step 310:eNodeB notifies that MME emergency attached process completes.
Step 311:MME sends more new bearer request to S-GW, notifies the mark of the eNodeB into UE service, address; After bearer update success, S-GW sends more new bearer response to MME.
Step 312: so far, UE promptly accesses EPS by 3GPP access network, and establishes PMIP or GTP tunnel between S-GW and PDNGW, completes the foundation of emergency bearing.User can initiate emergent session request and carry out emergent session business on emergency bearing.
Step 313: move to CDMA2000 network area as UE and find CDMA2000 access network, UE initiates pre-registration request at CDMA2000 network.
Step 314:UE initiates urgent pre-registration request to CDMA2000 access network, request message issues HRPD by E-UTRAN and MME, carrying the information such as the mark of UE, emergency type (as promptly switched mark) in this urgent pre-registration request message, setting up urgent HRPD session context with HRPD.Signalling path is set up in CDMA2000 system.
The request that step 315:HRPD receives according to INFORMATION DISCOVERYs such as emergency attached marks is emergency attached request, set up emergency bearing, HRPD selects the PDNGW being used for urgency traffic service from static configuration data, and selected PDN GW is used for follow-up emergency bearing and upgrades.
Selected PDN GW needs guarantee consistent with the PDN GW (as step 302) of 3GPP Web vector graphic, if not at same PDN GW, is cannot realize emergent session to switch.
Step 316:HSGW, before setting up emergency bearing, can carry out IAD session control process with PCRF further, from getting urgent QoS and policing rule, and performs the binding of carrying and session.
Step 317:UE initiates carrying to HSGW and sets up request, and request message issues HSGW by E-UTRAN and MME, sets up urgent HSGW session context.Media channel is set up in CDMA2000 system.
Step 318:UE sends measurement report to E-UTRAN, and E-UTRAN finds that CDMA2000 radio signal quality is better than 3GPP wireless signal, and just notice UE switches to CDMA2000 access network request emergent session.
Step 319:UE is by E-UTRAN and MME transparent transmission control signal passage on S101 interface, initiate urgent switch (HO) to CDMA2000 access network HRPD unit to ask, type of attachment is urgent switching type (emergency handover type), carries the information such as the mark of UE, urgent switching mark in this urgent HO request message.
Step 320:HRPD applies for radio bearer resources, and sends address forwarding request to HSGW, carries the information such as PDN GW address.HSGW returns to HSGW address in urgent HO response message.
Suppose that HRPD is urgent HO acceptance response message to the urgent HO response message that MME returns, in this urgent HO acceptance response message, carry the information such as HSGW address and CDMA2000 switching state.
Step 321:MME notifies that S-GW is to HSGW converting downlink data, and notifies E-UTRAN to CDMA2000 downloading data path message, carries the information such as urgent switching accepts, CDMA2000 switching state.
Step 322:E-UTRAN sends urgent HO to UE and responds, and the urgent handover request of notice UE accepts, and wireless signal is switched to CDMA2000 access network by UE.
Step 323:UE by CDMA2000 wireless access, and has been linked into cdma wireless system message to HRPD to HRPD transmission, and notice HRPD accesses.
Step 324:HRPD initiates emergency bearing update request to HSGW, and request emergent session is switched to the emergency bearing of CDMA2000 from the emergency bearing of 3GPP.
Step 325:HSGW sends agent binding update messages to selected PDN GW, the original session port in 3GPP access network of application binding; PDN GW process agent binding update, and send proxy binding acknowledgment messages to HSGW.
Step 326:HSGW returns bearer update response message to HRPD, and notice HRPD bearer update completes.
Step 327:HRPD sends urgent handoff completion message to MME, just sets up emergency bearing and complete the switching of emergency bearing to CDMA2000 emergency bearing of 3GPP between such UE and CDMA2000 access network.
Step 328 ~ set up PMIP tunnel between step 329:CDMA2000 access network and PDN GW.UE can be accessed by CDMA2000 access network, and send/receive IP packet by PDN GW, and emergent session has switched.
UE can also realize being switched to non-3 GPP network from 3GPP network urgent.For in the 3GPP network of the intercommunication with non-3 GPP network, suppose that a certain UE is when accessing this 3GPP access network and carrying out emergent session, owing to moving to the region at non-3 GPP access network place, emergent session is needed to be switched to non-3 GPP access network, Fig. 4 is that UE is linked into the emergent session switching flow figure of non-3 GPP access from 3GPP, as shown in Figure 4, this switching flow mainly comprises the steps:
Step 400:UE initiates emergency attached request to eNodeB, carries the information such as the mark of UE, emergency type, the network accessibility of UE, the instruction of request dispatching IP in this emergency attached request.
UE needs to set up emergency bearing at EPS access network, then on emergency bearing, initiates IMS emergent session before initiating emergent session.
Step 401:eNodeB is that UE selects one for the MME of its service, and this emergency attached request is forwarded to this MME.
According to information such as emergency types, step 402:MME judges that the request received is emergency attached request, skip the steps such as authentication, one is selected for the local PDN GW of urgency traffic service, as the packet gateway server of emergency bearing in the database of MME static configuration.
Step 403:MME is that UE selects a S-GW, and sets up emergency bearing request to its transmission.This sets up the information such as mark, the instruction for UE distributing IP address, default bandwidth information, PDN GW address of the mark carrying UE in emergency bearing request, urgent mark, MME.
Step 404:S-GW sends to PDN GW and sets up emergency bearing request.This is set up the address carrying S-GW in emergency bearing request, default bandwidth information, is the information such as the instruction of UE distributing IP address, urgent mark.
Step 405: if needed, the decision informations such as the urgent qos policy that PDN GW configures for this UE to PCRF request and charging regulation.
The urgent qos policy that step 406:PDN GW returns according to PCRF and charging decisions information, set up emergency bearing, and return to S-GW and set up emergency bearing response.
Step 407:S-GW sends to MME and sets up emergency bearing response.
Step 408:MME sends emergency attached response to eNodeB, shows that UE emergency attached is accepted to the request of network.
Step 409: complete wireless heterogeneous networks.Roughly comprise: eNodeB sends voice emergency bearing to UE and sets up request, require that UE preserves the important information of emergency bearing foundation, and open corresponding port.Wherein, the IP address, bandwidth information etc. of UE is set up in request and carry bearer network ID, PDN GW address, distributed to above-mentioned voice bearer; After radio bearer is set up, UE sends voice emergency bearing to eNodeB and sets up response.
Step 410:eNodeB notifies that MME emergency attached process completes.
Step 411:MME sends more new bearer request to S-GW, notifies the mark of the eNodeB into UE service, address; After bearer update success, S-GW sends more new bearer response to MME;
Step 412: so far, UE promptly accesses EPS by 3GPP access network, and establishes PMIP or GTP tunnel between S-GW and PDNGW, completes the foundation of emergency bearing.User can initiate emergent session request and carry out emergent session business on emergency bearing.
Step 413:UE moves to non-3 GPP network region and finds non-3 GPP access network network, and UE determines that initiating emergent session switches.
Step 414:UE initiates emergency attached request to non-3 GPP access network, and type of attachment is urgent handover request (emergency handover type), comprises the information such as the mark of UE, urgent switching mark in this emergency attached request message.
Step 415: the request that non-3 GPP access network control network element receives according to INFORMATION DISCOVERYs such as emergency attached marks is urgent handover request, set up emergency bearing, non-3 GPP access network control network element selects the PDN GW being used for urgency traffic service from static configuration data, and selected PDN GW is used for follow-up emergency bearing and upgrades.
Selected PDN GW needs guarantee consistent with the PDN GW (as step 402) of 3GPP Web vector graphic, if not at same PDN GW, is cannot realize emergent session to switch.
Step 416: non-3 GPP access network and PCRF carry out IAD session control process, and non-3 GPP access network gets urgent QoS and policing rule, and the binding performing carrying and session.
Step 417: non-3 GPP access network sends agent binding update messages to selected PDN GW, the original session port in 3GPP access network of application binding.
Step 418:PDN GW is to PCRF initiation session modify request messages, and PCRF returns session modification acknowledge message to PDN GW, carries urgent Qos strategy and charging regulation, and performed by PDN GW in this session modification acknowledge message.
Step 419:PDN GW process agent binding update, and send proxy binding acknowledgment messages to non-3 GPP access network.
Step 420: non-3 GPP access network sends emergency attached to UE and completes message, just sets up emergency bearing between such UE and non-3 GPP access network and completes the switching of emergency bearing to non-3 gpp emergency bearing of 3GPP;
Step 421: so far, sets up PMIP tunnel between non-3 GPP access network and PDN GW.UE can be accessed by non-3 GPP access network, and send/receive IP packet by PDN GW, and emergent session has switched.
From the flow process that the existing realization shown in above-mentioned Fig. 3 and Fig. 4 promptly switches, can find out, no matter be that the emergent session that UE is linked into CDMA2000 access from 3GPP switches, or the emergent session that UE is linked into non-3 GPP access from 3GPP switches, all need in advance in a network static configuration be emergent session service local PDN GW address, when UE initiates emergency attached or urgent handover request, network identify be flash request time, the PDN GW address of emergent session service is chosen as in the data of static configuration, then setting up emergency bearing or carrying out the renewal of emergency bearing port, such emergency attached or emergency bearing of could realizing switches.When emergency bearing switches, the PDN GW address that the PDN GW address needing target access network to select and source access network are selected is consistent, otherwise cannot carry out emergency bearing renewal and switch, and can cause the urgent failure switched.
And at present, in order to ensure resource and the reliability of urgency traffic, the configuration of many PDNGW is adopted in 3GPP network, in this case, utilize the existing method realizing emergent session and switch, as UE from 3GPP Network Mobility to target access network as non-3 GPP network or CDMA2000 access network, when carrying out emergent session switching, the PDN GW selected due to 3GPP access network and target access network may be inconsistent, the failure that emergent session switches can be caused, thus the continuity of urgent call can not be ensured, reduce service quality, have a strong impact on user's impression.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method realizing emergent session and switch, and can be successfully completed emergent session and switch, thus ensure the continuity of urgent call, improve service quality.
Another object of the present invention is to provide a kind of system realizing emergent session and switch, emergent session can be successfully completed and switch, thus ensure the continuity of urgent call, improve service quality.
For achieving the above object, technical scheme of the present invention is achieved in that
Realize the method that emergent session switches, in third generation partner program 3GPP access network and target access network, pre-set same data network gateway PDN GW respectively for urgent handed over service, the method also comprises:
Have the user terminal UE of access target access network ability when 3GPP access network initiates IP Multimedia System IMS emergent session, 3GPP network selects the PDN GW pre-set to set up emergency bearing, and carries out IMS emergent session on this emergency bearing;
When described UE moves to target access network and requires promptly to switch, target access network selects the PDN GW pre-set to set up local emergency carrying, and is switched to by IMS emergent session in the carrying of this local emergency.
Also comprise before the method: in 3GPP access network, pre-set multiple PDN GW for the service of other urgency traffic;
The described UE with access target access network ability initiates IMS emergent session at 3GPP access network and comprises:
When UE initiates emergency attached to 3GPP access network, the access capability instruction being used to indicate UE and whether having access target access network ability is sent to 3GPP access network, when access capability instruction display UE has access target access network ability, described in the selection of 3GPP access network, unique PDNGW arranged sets up emergency bearing and on this emergency bearing, carries out the step of IMS emergent session in advance;
Otherwise 3GPP access network selects any one the PDN GW pre-set set up emergency bearing and carry out other urgency traffic on this emergency bearing, process ends afterwards.
Described target access network is non-3 GPP access network, or CDMA2000 access network.
Realizing the system that emergent session switches, comprising for initiating urgent call and urgent user terminal UE, 3GPP access network switched, target access network and PDN GW;
Same data network gateway PDN GW is previously provided with respectively for urgent handed over service in 3GPP access network and target access network;
3GPP access network is used for, and when the UE with objective network access capability initiates urgent call, selects the PDN GW pre-set set up emergency bearing and on this emergency bearing, carry out IP Multimedia System IMS emergent session;
When described UE moves to target access network and requires promptly to switch, described target access network is used for, and selects the PDN GW pre-set to set up local emergency carrying, and is switched to by IMS emergent session in the carrying of this local emergency.
In described 3GPP access network, be also previously provided with multiple PDNGW for the service of other urgency traffic;
When UE initiates emergency attached to 3GPP access network, described UE also for, the access capability instruction being used to indicate UE and whether having access target access network ability is sent to 3GPP access network;
Described 3GPP access network also for, judge whether described UE has according to the access capability instruction received and access the ability of target access network;
When access capability instruction display UE has access target access network ability, the PDN GW that the described selection of continuation execution pre-sets sets up emergency bearing and on this emergency bearing, carries out the step of IMS emergent session;
When access capability instruction display UE does not have access target access network ability, described 3GPP access network also for, select any one PDN GW of pre-setting set up emergency bearing and carry out other urgency traffic on this emergency bearing.
Described target access network is non-3 GPP access network, or CDMA2000 access network.
The entity whether described UE of judgement has the ability of access target access network is: the mobile management unit MME in described 3GPP network.
As can be seen from the technical scheme that the invention described above provides, all uniquely be provided with same as promptly to switch the PDN GW used as the 3GPP access network of source access network and target access network, 3GPP access network adopts this PDN GW set up emergency bearing and carry out IMS emergent session on this emergency bearing, and when UE initiates the urgent switching to target access network from 3GPP access network, target access network only has the PDN GW of unique configuration available, therefore, ensure that the PDN GW that 3GPP access network and target access network use is homogeny, thus ensure that UE successfully realizes emergent session is switched to target access network switching from 3GPP access network, achieve the continuity of emergent session, improve service quality, improve user's impression.
Accompanying drawing explanation
Fig. 1 is the mutual system architecture schematic diagram of existing EPS access network and non-3 GPP access network cross winding;
Fig. 2 is the mutual system architecture schematic diagram of existing EPS access network and CDMA access network;
Fig. 3 is that existing UE is linked into the emergent session switching flow figure of CDMA2000 access from 3GPP;
Fig. 4 is that existing UE is linked into the emergent session switching flow figure of non-3 GPP access from 3GPP;
Fig. 5 is the flow chart that the present invention realizes the method that emergent session switches;
Fig. 6 is the flow chart that the present invention realizes the embodiment of the method that emergent session switches;
Fig. 7 is that UE of the present invention is linked into the emergent session switching flow figure of CDMA2000 access from 3GPP;
Fig. 8 is that UE of the present invention is linked into the emergent session switching flow figure of non-3 GPP access from 3GPP.
Embodiment
Fig. 5 is the flow chart that the present invention realizes the method that emergent session switches, and as shown in Figure 5, comprising:
Step 500: pre-set same PDN GW respectively for urgent handed over service in 3GPP access network and target access network.Wherein, target access network can be non-3 gpp access network, or CDMA2000 access network.
Step 501: have the UE of access target access network ability when 3GPP access network initiates IMS emergent session, 3GPP network selects the PDN GW pre-set to set up emergency bearing, and carries out IMS emergent session on this emergency bearing.
Step 502: when the UE with access target access network ability moves to target access network and requires promptly to switch, target access network selects the PDN GW pre-set to set up local emergency carrying, and is switched to by IMS emergent session in the carrying of this local emergency.
From the inventive method, all uniquely be provided with same as promptly to switch the PDN GW used as the 3GPP access network of source access network and target access network, 3GPP access network adopts this PDN GW set up emergency bearing and carry out IMS emergent session on this emergency bearing, and when UE initiates the urgent switching to target access network from 3GPP access network, target access network only has the PDN GW of unique configuration available, therefore, ensure that the PDN GW that 3GPP access network and target access network use is homogeny, thus ensure that UE successfully realizes emergent session is switched to target access network switching from 3GPP access network, achieve the continuity of emergent session, improve service quality, improve user's impression.
In the network design of reality, emergent session is the urgency traffic of limit priority, and in 3GPP network, only dispose a PDN GW is unsafe for emergent session.Multiple PDN GW for emergent session service is disposed in usual meeting in 3GPP network, forms a PDN GW pond, carries out load balancing to urgency traffic, makes it can be distributed on multiple PDN GW and serves, ensure resource and the reliability of urgency traffic.In view of this application scenarios, also comprise before the inventive method: in 3GPP access network, pre-set multiple other PDN GW for urgency traffic service.
Also comprised before step 501: when UE initiates emergency attached to 3GPP access network, the access capability instruction being used to indicate UE and whether having access target access network ability is sent to 3GPP access network, when access capability instruction display UE has access target access network ability, perform step 501;
Otherwise 3GPP access network can select any one PDN GW set up emergency bearing and carry out other urgency traffic on this emergency bearing, jumps out flow process of the present invention afterwards, according to existing, this emergent session business is processed.
Fig. 6 is the flow chart that the present invention realizes the embodiment of the method that emergent session switches, suppose in 3GPP access network and target access network, to pre-set same PDN GW respectively for urgent handed over service, suppose in the present embodiment, 3GPP access network is previously provided with multiple PDN GW for urgency traffic service, thinks that urgency traffic provides load balancing and enough resources.As shown in Figure 6, further comprising the steps of:
Step 600:UE initiates emergency attached request to the MME in 3GPP access network, not only carries the information such as the mark of UE, emergency type in this emergency attached request, also carries the access capability instruction whether UE has access target access network ability.
After MME in step 601:3GPP access network receives the emergency attached request from UE, according to the access capability instruction of carrying in this emergency attached request, if judge that UE has the ability of access target access network, then MME selects the special unique PDN GW being used for urgent handed over service, and adopts this PDN GW to set up emergency bearing; If judge that UE does not have the ability of access target access network, then MME can select other PDN GW being urgency traffic is arranged to set up emergency bearing.
In the embodiment shown in fig. 6, suppose that access capability instruction display UE has the ability of access target access network.
MME in step 602:3GPP access network S-GW wherein initiates carrying and sets up request, carries the address of PDN GW selected in step 601.S-GW initiates carrying to this PDN GW and sets up request, and final UE sets up emergency bearing by S-GW and this PDN GW, and carries out IMS emergent session on this emergency bearing.
Step 603:UE moves to target access network region, initiates urgent HO ask to target access network, applies for that the emergent session by 3GPP system is set up is switched to target access network, carries the mark of UE and promptly switches mark in this urgent HO request.
Wherein, target access network can be non-3 gpp access network, or CDMA2000 access network.
Step 604: target access network is according to the urgent switching instruction of carrying in urgent HO request, know that the request received is the emergent session handover request that UE initiates from 3GPP system, the middle selection that selection pre-sets for special unique PDN GW of urgent handed over service, and adopts this PDN GW to be based upon the emergency bearing of target access network.
Step 605: target access network initiates emergency bearing renewal process to self selected PDN GW, asks to be switched to by the emergency bearing of 3GPP access network on the emergency bearing of target access network foundation.
The PDN GW that step 606:UE and target access network, wooden plaque access network are selected sets up emergency bearing passage and carries out the switching of emergency bearing, and final emergent session is switched to target access network.
Step 607: after switching completes, the radio bearer resources of release UE and 3GPP access network and access bearer resource.
Fig. 7 is that UE of the present invention is linked into the emergent session switching flow figure of CDMA2000 access from 3GPP, supposes in 3GPP access network and CDMA2000 access network, to pre-set same PDN GW respectively for urgent handed over service, as shown in Figure 7, comprising:
Step 700:UE initiates emergency attached request to eNodeB, carry the information such as the mark of UE, emergency type, the network accessibility of UE, the instruction of request dispatching IP in this emergency attached request, also carry the access capability instruction whether UE has access target access network ability.
UE needs to set up emergency bearing at EPS access network, then on emergency bearing, initiates IMS emergent session before initiating emergent session.
Step 701:eNodeB is that UE selects one for the MME of its service, and this emergency attached request is forwarded to this MME, carry the information such as the mark of UE, emergency type, the network accessibility of UE, the instruction of request dispatching IP in this emergency attached request, also carry the access capability instruction whether UE has access target access network ability.
According to information such as emergency types, step 702:MME judges that the request received is emergency attached request, skip the steps such as authentication, judge whether UE has CDMA2000 access capability according to access capability instruction simultaneously, suppose in the present embodiment that UE has CDMA2000 access capability, then select the special unique PDN GW for urgent handed over service pre-set in MME, as the packet gateway server of emergency bearing.
Step 703:MME is that UE selects a S-GW, and sets up emergency bearing request to its transmission.This sets up the information such as address of the mark carrying UE in emergency bearing request, urgent mark, the mark of MME, the instruction for UE distributing IP address, default bandwidth information, the selected special unique PDN GW for urgent handed over service.
Step 704:S-GW sends to the selected special unique PDN GW for urgent handed over service and sets up emergency bearing request.This is set up the address carrying S-GW in emergency bearing request, default bandwidth information, is the information such as the instruction of UE distributing IP address, urgent mark.
Step 705: if needed, the decision informations such as the urgent qos policy that selected special unique PDN GW for urgent handed over service configures to PCRF request for this UE and charging regulation.
Step 706: the urgent qos policy that selected special unique PDN GW for urgent handed over service returns according to PCRF and charging decisions information, sets up emergency bearing, and returns to S-GW and set up emergency bearing response.
Step 707:S-GW sends to MME and sets up emergency bearing response.
Step 708:MME sends emergency attached response to eNodeB, shows that UE emergency attached is accepted to the request of network.
Step 709: complete wireless heterogeneous networks.Roughly comprise: eNodeB sends voice emergency bearing to UE and sets up request, require that UE preserves the important information of emergency bearing foundation, and open corresponding port.Wherein, above-mentioned voice bearer set up in request carry bearer network ID, the selected special unique PDN GW for urgent handed over service address, distribute to the IP address, bandwidth information etc. of UE; After radio bearer is set up, UE sends voice emergency bearing to eNodeB and sets up response.
Step 710:eNodeB notifies that MME emergency attached process completes.
Step 711:MME sends more new bearer request to S-GW, notifies the mark of the eNodeB into UE service, address; After bearer update success, S-GW sends more new bearer response to MME.
Step 712: so far, UE promptly accesses EPS by 3GPP access network, and establishes PMIP or GTP tunnel between S-GW and PDNGW, completes the foundation of emergency bearing.User can initiate emergent session request and carry out emergent session business on emergency bearing.
Step 713: move to CDMA2000 network area as UE and find CDMA2000 access network, UE initiates pre-registration request at CDMA2000 network.
Step 714:UE initiates urgent pre-registration request to CDMA2000 access network, request message issues HRPD by E-UTRAN and MME, carrying the information such as the mark of UE, emergency type (as promptly switched mark) in this urgent pre-registration request message, setting up urgent HRPD session context with HRPD.Signalling path is set up in CDMA2000 system.
The request that step 715:HRPD receives according to INFORMATION DISCOVERYs such as emergency attached marks is emergency attached request, set up emergency bearing, HRPD selects the local special unique PDN GW for urgent handed over service pre-set, selected PDN GW to be used for follow-up emergency bearing renewal.
Step 716:HSGW, before setting up emergency bearing, can carry out IAD session control process with PCRF further, from getting urgent QoS and policing rule, and performs the binding of carrying and session.
Step 717:UE initiates carrying to HSGW and sets up request, and request message issues HSGW by E-UTRAN and MME, sets up urgent HSGW session context.Media channel is set up in CDMA2000 system.
Step 718:UE sends measurement report to E-UTRAN, and E-UTRAN finds that CDMA2000 radio signal quality is better than 3GPP wireless signal, and just notice UE switches to CDMA2000 access network request emergent session.
Step 719:UE is by E-UTRAN and MME transparent transmission control signal passage on S101 interface, initiate urgent HO to CDMA2000 access network HRPD unit to ask, type of attachment is urgent switching type (emergency handover type), carries the information such as the mark of UE, urgent switching mark in this urgent HO request message.
Step 720:HRPD applies for radio bearer resources, and sends address forwarding request to HSGW, carries the information such as PDN GW address.HSGW returns to HSGW address in urgent HO response message.
Suppose that HRPD is urgent HO acceptance response message to the urgent HO response message that MME returns, in this urgent HO acceptance response message, carry the information such as HSGW address and CDMA2000 switching state.
Step 721:MME notifies that S-GW is to HSGW converting downlink data, and notifies E-UTRAN to CDMA2000 downloading data path message, carries the information such as urgent switching accepts, CDMA2000 switching state.
Step 722:E-UTRAN sends urgent HO to UE and responds, and the urgent handover request of notice UE accepts, and wireless signal is switched to CDMA2000 access network by UE.
Step 723:UE by CDMA2000 wireless access, and has been linked into cdma wireless system message to HRPD to HRPD transmission, and notice HRPD accesses.
Step 724:HRPD initiates emergency bearing update request to HSGW, and request emergent session is switched to the emergency bearing of CDMA2000 from the emergency bearing of 3GPP.
Step 725:HSGW sends agent binding update messages to PDN GW selected in CDMA2000 access network, the original session port in 3GPP access network of application binding; This PDN GW process agent binding update, and send proxy binding acknowledgment messages to HSGW.
Step 726:HSGW returns bearer update response message to HRPD, and notice HRPD bearer update completes.
Step 727:HRPD sends urgent handoff completion message to MME, just sets up emergency bearing and complete the switching of emergency bearing to CDMA2000 emergency bearing of 3GPP between such UE and CDMA2000 access network.
Step 728 ~ set up PMIP tunnel between step 729:CDMA2000 access network and PDN GW.UE can be accessed by CDMA2000 access network, and send/receive IP packet by PDN GW, and emergent session has switched.
Fig. 8 is that UE of the present invention is linked into the emergent session switching flow figure of non-3 GPP access from 3GPP, as hypothesis pre-sets same PDN GW respectively for urgent handed over service in 3GPP access network and non-3 GPP access network, as shown in Figure 8, comprising:
Step 800:UE initiates emergency attached request to eNodeB, carry the information such as the mark of UE, emergency type, the network accessibility of UE, the instruction of request dispatching IP in this emergency attached request, also carry the access capability instruction whether UE has access target access network ability.
UE needs to set up emergency bearing at EPS access network, then on emergency bearing, initiates IMS emergent session before initiating emergent session.
Step 701:eNodeB is that UE selects one for the MME of its service, and this emergency attached request is forwarded to this MME, carry the information such as the mark of UE, emergency type, the network accessibility of UE, the instruction of request dispatching IP in this emergency attached request, also carry the access capability instruction whether UE has access target access network ability.
According to information such as emergency types, step 702:MME judges that the request received is emergency attached request, skip the steps such as authentication, judge whether UE has non-3 GPP access ability according to access capability instruction simultaneously, suppose in the present embodiment that UE has non-3 GPP access ability, then select the special unique PDN GW for urgent handed over service pre-set in MME, as the packet gateway server of emergency bearing.
Step 703:MME is that UE selects a S-GW, and sets up emergency bearing request to its transmission.This sets up the information such as mark, the instruction for UE distributing IP address, default bandwidth information, the selected special unique PDN GW address for urgent handed over service of the mark carrying UE in emergency bearing request, urgent mark, MME.
Step 804:S-GW sends to the selected special unique PDN GW for urgent handed over service and sets up emergency bearing request.This is set up the address carrying S-GW in emergency bearing request, default bandwidth information, is the information such as the instruction of UE distributing IP address, urgent mark.
Step 805: if needed, the decision informations such as the urgent qos policy that PDN GW configures for this UE to PCRF request and charging regulation.
Step 806: the urgent qos policy that selected special unique PDN GW for urgent handed over service returns according to PCRF and charging decisions information, sets up emergency bearing, and returns to S-GW and set up emergency bearing response.
Step 807:S-GW sends to MME and sets up emergency bearing response.
Step 808:MME sends emergency attached response to eNodeB, shows that UE emergency attached is accepted to the request of network.
Step 809: complete wireless heterogeneous networks.Roughly comprise: eNodeB sends voice emergency bearing to UE and sets up request, require that UE preserves the important information of emergency bearing foundation, and open corresponding port.Wherein, above-mentioned voice bearer set up in request carry bearer network ID, the selected special unique PDN GW for urgent handed over service address, distribute to the IP address, bandwidth information etc. of UE; After radio bearer is set up, UE sends voice emergency bearing to eNodeB and sets up response.
Step 810:eNodeB notifies that MME emergency attached process completes.
Step 811:MME sends more new bearer request to S-GW, notifies the mark of the eNodeB into UE service, address; After bearer update success, S-GW sends more new bearer response to MME.
Step 812: so far, UE promptly accesses EPS by 3GPP access network, and establishes PMIP or GTP tunnel between S-GW and PDNGW, completes the foundation of emergency bearing.User can initiate emergent session request and carry out emergent session business on emergency bearing.
Step 813:UE moves to non-3 GPP network region and finds non-3 GPP access network network, and UE determines that initiating emergent session switches.
Step 814:UE initiates emergency attached request to non-3 GPP access network, and type of attachment is urgent handover request (emergency handover type), comprises the information such as the mark of UE, urgent switching mark in this emergency attached request message.
Step 815: the request that non-3 GPP access network control network element receives according to INFORMATION DISCOVERYs such as emergency attached marks is urgent handover request, set up emergency bearing, non-3 GPP access network control network element selects the local special unique PDN GW for urgent handed over service pre-set, selected PDNGW to be used for follow-up emergency bearing renewal.
Step 816: non-3 GPP access network and PCRF carry out IAD session control process, and non-3 GPP access network gets urgent QoS and policing rule, and the binding performing carrying and session.
Step 817: non-3 GPP access network sends agent binding update messages to self selected PDN GW, the original session port in 3GPP access network of application binding.
Step 818: the selected special unique PDN GW for urgent handed over service is to PCRF initiation session modify request messages, PCRF returns session modification acknowledge message to this PDN GW, carry urgent Qos strategy and charging regulation in this session modification acknowledge message, and performed by this PDN GW.
Step 819: the selected special unique PDN GW process agent binding update for urgent handed over service, and send proxy binding acknowledgment messages to non-3 GPP access network.
Step 820: non-3 GPP access network sends emergency attached to UE and completes message, just sets up emergency bearing between such UE and non-3 GPP access network and completes the switching of emergency bearing to non-3 gpp emergency bearing of 3GPP;
Step 821: so far, sets up PMIP tunnel between non-3 GPP access network and the selected special unique PDN GW for urgent handed over service.UE can be accessed by non-3 GPP access network, and send/receive IP packet by PDN GW, and emergent session has switched.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. realize the method that emergent session switches, it is characterized in that, in third generation partner program 3GPP access network and target access network, pre-set same data network gateway PDN GW respectively for urgent handed over service, the method also comprises:
Multiple PDN GW for the service of other urgency traffic is pre-set in 3GPP access network;
Have the user terminal UE of access target access network ability when 3GPP access network initiates IP Multimedia System IMS emergent session, 3GPP network selects the PDN GW pre-set to set up emergency bearing, and carries out IMS emergent session on this emergency bearing;
When described UE moves to target access network and requires promptly to switch, target access network selects the PDN GW pre-set to set up local emergency carrying, and is switched to by IMS emergent session in the carrying of this local emergency;
Wherein, the UE described in access target access network ability initiates IMS emergent session at 3GPP access network and comprises:
When UE initiates emergency attached to 3GPP access network, the access capability instruction being used to indicate UE and whether having access target access network ability is sent to 3GPP access network, when access capability instruction display UE has access target access network ability, described in the selection of 3GPP access network, unique PDN GW arranged sets up emergency bearing and on this emergency bearing, carries out the step of IMS emergent session in advance;
Otherwise 3GPP access network selects any one the PDN GW pre-set set up emergency bearing and carry out other urgency traffic on this emergency bearing, process ends afterwards.
2. method according to claim 1, is characterized in that, described target access network is non-3 GPP access network, or CDMA2000 access network.
3. realizing the system that emergent session switches, it is characterized in that, comprising for initiating urgent call and urgent user terminal UE, 3GPP access network switched, target access network and PDN GW;
Same data network gateway PDN GW is previously provided with respectively for urgent handed over service in 3GPP access network and target access network;
In described 3GPP access network, be also previously provided with multiple PDN GW for the service of other urgency traffic;
3GPP access network is used for, and when the UE with objective network access capability initiates urgent call, selects the PDN GW pre-set set up emergency bearing and on this emergency bearing, carry out IP Multimedia System IMS emergent session;
When described UE moves to target access network and requires promptly to switch, described target access network is used for, and selects the PDN GW pre-set to set up local emergency carrying, and is switched to by IMS emergent session in the carrying of this local emergency;
When UE initiates emergency attached to 3GPP access network, described UE also for, the access capability instruction being used to indicate UE and whether having access target access network ability is sent to 3GPP access network;
Described 3GPP access network also for, judge whether described UE has according to the access capability instruction received and access the ability of target access network;
When access capability instruction display UE has access target access network ability, the PDN GW that the described selection of continuation execution pre-sets sets up local emergency carrying, and IMS emergent session is switched to the step in the carrying of this local emergency;
When access capability instruction display UE does not have access target access network ability, described 3GPP access network also for, select any one PDN GW of pre-setting set up emergency bearing and carry out other urgency traffic on this emergency bearing.
4. system according to claim 3, is characterized in that, described target access network is non-3 GPP access network, or CDMA2000 access network.
5. system according to claim 3, is characterized in that, the described entity of ability judging whether described UE has an access target access network is: the mobile management unit MME in described 3GPP network.
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| CN103516662B (en) * | 2011-12-31 | 2017-09-26 | 华为数字技术（成都）有限公司 | A kind of session backup method, apparatus and system |
| US9843913B2 (en) * | 2015-06-12 | 2017-12-12 | At&T Intellectual Property I, L.P. | e911 call continuity for WiFi offload |
| US11089519B2 (en) * | 2016-04-13 | 2021-08-10 | Qualcomm Incorporated | Migration of local gateway function in cellular networks |
| US20190364412A1 (en) * | 2018-05-25 | 2019-11-28 | Mediatek Inc. | Apparatus and method for pdu session establishment restriction in emergency registration |
| WO2020003886A1 (en) * | 2018-06-25 | 2020-01-02 | Nec Corporation | Ue behavior when the device is attached for emergency service |
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