CN101945365B - Method and system for switching emergency session - Google Patents
Method and system for switching emergency session Download PDFInfo
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- CN101945365B CN101945365B CN200910088685.9A CN200910088685A CN101945365B CN 101945365 B CN101945365 B CN 101945365B CN 200910088685 A CN200910088685 A CN 200910088685A CN 101945365 B CN101945365 B CN 101945365B
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Abstract
The invention discloses a method for switching an emergency session. The method comprises the following steps that: when the emergency session needs to be switched to a target access system from a source access system, user equipment (UE) sends an emergency switching request to the target access system, wherein the emergency switching request carries the area information of the UE in the source access system; and the target access system searches the corresponding relationship between the area information which is covered by an neighboring access system and is stored by the target access system per se and a packet network gateway (P-GW) according to the area information in the emergency switching request, selects the P-GW corresponding to the area information in the emergency switching request, and executes the switching of the emergency session by adopting the selected P-GW. The invention also discloses a system for switching the emergency session, and solves the problem of a switching failure caused by the inconformity of selected P-GWs when the emergency session is switched to a non-3rd generation partnership project (3GPP) network or a code division multiple access 2000 (CDMA2000) network from a 3rd generation partnership project (3GPP) network in the prior art.
Description
Technical field
The present invention relates to the session handoff technique in mobile communication, relate in particular to the method and system that a kind of emergent session switches.
Background technology
At present, flattening development along with the network architecture, and multiple high-speed wideband moves the appearance of access way, IP Multimedia System (IMS, IP Multimedia Core Network Subsystem) a kind of grouping evolution system (EPS, the Evolved Packet System) network in territory is progressively applied.
Third generation partner program (3GPP, 3rd Generation Partnership Project) the EPS network in is by the universal land radio access web (E-UTRAN of evolution, Evolved Universal TerrestrialRadio Access Network), mobile management unit (MME, Mobility Management Entity), gateway (S-GW, Serving Gateway), data network gateway (P-GW, Packet Data NetworkGateway), 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 form.
The intercommunication of EPS network support and non-3 GPP access network network, supports the access of non-3GPP IP Access Network.The intercommunication of EPS network and non-3 GPP access network network is by S2a/b/c Interface realization, and P-GW is the anchor point between 3GPP and non-3 GPP access network network.As shown in Figure 1, Fig. 1 is the system architecture schematic diagram of EPS network and non-3 GPP access network network interoperability, and this system architecture comprises 3GPP access network (being EPS network) and non-3 GPP access network network two parts.Wherein, non-3 GPP access network network can be divided into trusted non-3GPP IP Access Network and trustless non-3GPP IP Access Network; The non-3GPP IP of trusted Access Network can directly be connected with P-GW by S2a interface; Trustless non-3GPP IP Access Network is connected with the P-GW of EPS network by the data gateway (ePDG, Evolved Packet Data Gateway) of evolution, and the interface between ePDG and P-GW is S2b interface.
In the scheme providing at 3GPP, preferably support the intercommunication of 3GPP EPS network and 3GPP2 code division multiple access (CDMA2000, Code Division Multiple Access 2000) network.As shown in Figure 2, Fig. 2 is the system architecture schematic diagram of EPS network and CDMA2000 network interoperability, this system architecture comprises 3GPP access network (being EPS network) and CDMA2000 access network two parts, wherein the high-speed packet data service gateway of CDMA2000 access network (HSGW, High Rate PacketServing Gateway) is directly connected with P-GW by S2a interface; HSGW is also connected with S-GW by S103 interface; (the HRPD of high-speed packet data network unit of CDMA2000 access network, HighRate Packet Data) directly by S101 interface, be connected with MME, can transparent transmission user terminal (UE, User Equipment) adhering to and the signaling messages such as carrying foundation to HRPD on S101 signaling tunnel.
Urgent call (Emergency Call) is distinctive a kind of voice service function in mobile communication system, and urgent call is all to realize in circuit switching (CS, Circuit Switch) territory conventionally.At present, along with the IPization of network, packet switching (PS, Packet Switch) territory also starts to support emergence call service, and by IMS, carries out call signaling control on PS territory, to realize urgent call.The emergence call service that IMS territory provides is referred to as IMS urgent call, IMS urgent call need to realize IP carrying in non-3GPP IP connecting system or 3GPP connecting system, therefore, in switching, the session of non-3GPP IP connecting system and 3GPP connecting system need to support emergent session to switch.
The emergent session switching flow of UE from 3GPP connecting system to CDMA2000 connecting system in prior art, as shown in Figure 3, mainly comprises the following steps:
Step 301～302, UE initiates, before emergent session, need to set up emergency bearing at EPS network, then on emergency bearing, initiates IMS emergent session; First UE initiates emergency attached request to E-UTRAN, and E-UTRAN is the MME that UE is chosen as its service, and emergency attached request is transmitted to this MME.
Step 303～304, MME selects one for local P-GW and the S-GW of urgency traffic service in the database of static configuration, sends emergency bearing set up request to selected S-GW, by S-GW, the emergency bearing request of setting up is transmitted to P-GW.
Step 305～307, if needed, the decision informations such as emergency services quality (OoS, the Quality of Service) strategy that P-GW configures for this UE to PCRF request and charging regulation, and set up according to this emergency bearing, then by S-GW, to MME, return to emergency bearing and set up response.
Step 308, MME sends emergency attached response to E-UTRAN, shows that the request of UE emergency attached is accepted.
Step 309, E-UTRAN sends voice emergency bearing to UE and sets up request, the important information that requires UE to keep emergency bearing to set up, and open corresponding port; UE returns to voice emergency bearing to E-UTRAN and sets up response.
Step 310, E-UTRAN notice MME emergency attached process completes.
Step 311, MME sends more new bearer request to S-GW, and after institute's bearer update success, to MME, sends more new bearer response.
So far, UE promptly accesses EPS network by 3GPP connecting system, and between S-GW and P-GW, set up proxy-mobile IP (PMIP, Proxy Mobile IP) or conventional data transmission platform (GTP, General Data Transfer Platform) tunnel, has completed the foundation of emergency bearing.User can initiate emergent session request and carry out emergent session business on emergency bearing.
Step 312～313, UE moves to CDMA2000 network area and finds CDMA2000 connecting system, to CDMA2000 connecting system, initiates urgent pre-registration request, and request message is issued HRPD by E-UTRAN and MME, sets up HRPD session context with HRPD.
Step 314, HRPD selects the P-GW for urgency traffic service from the database of static configuration.
The selected P-GW of HRPD need to guarantee that the P-GW using with 3GPP connecting system is consistent, otherwise cannot realize the switching of emergent session.
Step 315, HSGW, before setting up emergency bearing, carries out IAD session control process with PCRF, gets urgent QoS and policing rule, and carries out the binding of carrying and session.
Step 316, UE initiates carrying to HSGW and sets up request, and request message sends to HSGW by E-UTRAN and MME, thereby sets up the context of HSGW session.
Step 317, UE sends measurement report to E-UTRAN, and E-UTRAN finds that the radio signal quality of CDMA2000 connecting system is better than the wireless signal of EPS system, just notifies UE to switch to CDMA2000 connecting system request emergent session.
Step 318～319, UE is by E-UTRAN and MME transparent transmission control signal passage on S101 interface, to the HRPD of CDMA2000 connecting system, initiates urgent handover request; HRPD applies for radio bearer resources, and sends address forwarding request to HSGW, carries the information such as P-GW address.HSGW returns to HSGW address in response message.HRPD returns to urgent switching acceptance response message to MME, carries the information such as HSGW address and CDMA2000 switching state.
Step 320, S-GW is to HSGW converting downlink data for MME notice, and notifies E-UTRAN to CDMA2000 downloading data path message, carries the information such as urgent switching is accepted, CDMA2000 switching state.
Step 321～322, the urgent handover request of E-UTRAN notice UE is accepted, and UE need to be switched to wireless signal CDMA2000 connecting system, and the message that transmission has been linked into CDMA2000 connecting system is to HRPD.
Step 323, 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 EPS.
Step 324, HSGW sends agent binding update request to selected P-GW, and application is bundled in the former session port in EPS system; P-GW processes agent binding update, and sends proxy binding acknowledgment messages to HSGW.
Step 325, HSGW returns to bearer update response message to HRPD, and notice HRPD bearer update completes.
Step 326, HRPD sends urgent handoff completion message to MME, just sets up like this emergency bearing and completed the emergency bearing of EPS to the switching of CDMA2000 emergency bearing between UE and CDMA2000 connecting system.
The emergent session switching flow of UE from 3GPP connecting system to non-3GPP connecting system in prior art, as shown in Figure 4, mainly comprises the following steps:
Step 401～411, UE promptly accesses the process of EPS network by 3GPP connecting system, identical with step 301～311 in Fig. 3, repeats no more herein.
Step 412～414, UE moves to non-3GPP network area and finds non-3GPP connecting system, determines to initiate emergent session and switches; UE initiates emergency attached request to non-3GPP connecting system, and the control network element of non-3GPP connecting system is selected the P-GW for urgency traffic service from the database of static configuration.
Selected P-GW need to guarantee that the P-GW using with 3GPP connecting system is consistent, otherwise cannot realize the switching of emergent session.
Step 415, non-3GPP connecting system and PCRF carry out IAD session control process, get urgent QoS and policing rule, and carry out the binding of carrying and session.
Step 416, non-3GPP connecting system sends agent binding update messages to selected P-GW, and application is bundled in the former session port in 3GPP connecting system.
Step 417, P-GW is to PCRF initiation session modify request messages, and PCRF returns to session modification acknowledge message to P-GW, carries urgent Qos strategy and charging regulation, and carried out by P-GW in this message.
Step 418, P-GW processes agent binding update, and sends proxy binding acknowledgment messages to non-3GPP connecting system.
Step 419, non-3GPP connecting system sends emergency attached to UE and completes message, just sets up emergency bearing like this and completed the emergency bearing of 3GPP to the switching of non-3GPP emergency bearing between UE and non-3GPP connecting system.
From the urgent switching flow shown in above-mentioned Fig. 3 and Fig. 4, can find out, for emergency attached and the urgent process of switching, needing in advance static configuration in network is the local P-GW of emergent session service; When UE initiates emergency attached or urgent handover request, network need to be chosen as the P-GW of emergent session service in the data of static configuration, and then set up emergency bearing or carry out the renewal of emergency bearing port, could realize like this emergency attached or emergency bearing and switch.
In addition, when emergency bearing switches, need the P-GW of target access system selection and the P-GW of source connecting system selection to be consistent, otherwise cannot carry out renewal and the switching of emergency bearing, can cause the failure of urgent switching.
In actual network design, the EPS network of 3GPP can not disposable making the overall arrangement for, and the mode that conventionally adopts focus city to launch is expanded, and this just exists the network coexisted problem of a plurality of EPS networks and non-3GPP network or CDMA2000.As shown in Figure 5, be a plurality of EPS networks and the network coexisted schematic diagram of non-3GPP; As shown in Figure 6, be a plurality of EPS networks and the network coexisted schematic diagram of CDMA2000.Because non-3GPP network or CDMA2000 network may be in abutting connection with a plurality of EPS networks, therefore for realizing emergent session service switchover, need in the data of static configuration, configure a plurality of EPS networks for the P-GW of emergent session service, like this from any EPS Network Mobility to non-3GPP network or CDMA2000 network can guarantee the successful that emergent session business is switched.
Yet, in non-3GPP network or CDMA2000 network, adopt the configuration of a plurality of P-GW to have and conflict with prior art, that is to say that prior art cannot guarantee the successful of the lower UE of a plurality of P-GW configurations from 3GPP Network Mobility to non-3GPP network or CDMA2000 network, because two selected P-GW of network that switch may be inconsistent, thereby can directly cause the handoff failure of emergent session.
Summary of the invention
In view of this, the method and system that provides a kind of emergent session to switch is provided main purpose of the present invention, to solve in prior art emergent session from 3GPP network to non-3GPP network or when CDMA2000 network switches, because the P-GW selecting is inconsistent and easily cause the problem of handoff failure.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method that emergent session switches, the method comprises:
User terminal UE, when needs are switched to target access system by emergent session from source connecting system, sends urgent handover request to described target access system, in described urgent handover request, carries described UE at the area information of described source connecting system;
Described target access system is according to the area information in described urgent handover request, search area information that the connecting system of the adjacency of self storing covers and the corresponding relation of data network gateway P-GW, select the P-GW corresponding with area information in described urgent handover request, and adopt the switching of selected P-GW execution emergent session.
Described source connecting system is third generation partner program 3GPP connecting system, and described target access system is non-3GPP connecting system or code division multiple access CDMA2000 connecting system.
The method further comprises:
When described emergent session is switched to non-3GPP connecting system from 3GPP connecting system, described urgent handover request is emergency attached request message;
When described emergent session is switched to CDMA2000 connecting system from 3GPP connecting system, described urgent handover request is urgent pre-registration request message.
Before described UE sends urgent handover request to target access system, the method further comprises:
Described UE emergency attached arrives source connecting system, and initiates the emergent session in the connecting system of described source;
Described UE moves to behind the overlay area of target access system, source access network is according to measurement report, when the radio signal quality of described target access system is better than described source connecting system, notify described UE that emergent session is switched to target access system from source connecting system.
Described target access system adopts selected P-GW to carry out the switching of emergent session, is specially:
Described target access system adopts selected P-GW to set up local emergency bearing, and initiates emergency bearing update request to selected P-GW;
Described UE and target access system, selected P-GW set up emergency bearing passage, and carry out the switching of emergency bearing;
After emergency bearing handover success, described source connecting system discharges the bearing resource with UE.
Described UE is tracing area TA information at the area information of source connecting system.
The system that the present invention also provides a kind of emergent session to switch, this system comprises: UE, source connecting system and target access system, wherein,
Described UE, for when needs are switched to target access system by emergent session from described source connecting system, sends urgent handover request to described target access system, in described urgent handover request, carries described UE at the area information of described source connecting system;
Described source connecting system, for before emergent session switches, for described UE provides emergent session service;
Described target access system, be used for according to the area information of described urgent handover request, search area information that the connecting system of the adjacency of self storing covers and the corresponding relation of P-GW, select the P-GW corresponding with area information in described urgent handover request, and adopt the switching of selected P-GW execution emergent session.
Described source connecting system is 3GPP connecting system, and described target access system is non-3GPP connecting system or CDMA2000 connecting system.
When described emergent session is switched to non-3GPP connecting system from 3GPP connecting system, described urgent handover request is emergency attached request message;
When described emergent session is switched to CDMA2000 connecting system from 3GPP connecting system, described urgent handover request is urgent pre-registration request message.
Described UE is further used for, before sending urgent handover request, emergency attached is to source connecting system, and initiate the emergent session in the connecting system of described source, after moving to the overlay area of target access system, measurement report is issued to source access network, and when the radio signal quality of described target access system is better than described source connecting system, source access network notifies described UE that emergent session is switched to target access system from source connecting system.
The method and system that a kind of emergent session provided by the present invention switches, at UE, move to objective network region, and while initiating the urgent switching to target access system (non-3GPP connecting system or CDMA2000 connecting system) from source connecting system (3GPP connecting system), in urgent handover request, carry the area information of source connecting system, target access system selects corresponding P-GW to realize urgent switching according to UE at the area information of source connecting system from static configuration data, can guarantee so the local consistency of selecting of source connecting system and target access system P-GW, thereby guarantee that UE can successfully be switched to target access system by emergent session from source connecting system, realize the continuity business of emergent session.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of EPS network and non-3GPP network interoperability in prior art;
Fig. 2 is the system architecture schematic diagram of EPS network and CDMA2000 network interoperability in prior art;
Fig. 3 is the flow chart that in prior art, the emergent session of UE from 3GPP connecting system to CDMA200 connecting system switches;
Fig. 4 is the flow chart that in prior art, the emergent session of UE from 3GPP connecting system to non-3GPP connecting system switches;
Fig. 5 is a plurality of EPS networks and the network coexisted schematic diagram of non-3GPP in prior art;
Fig. 6 is a plurality of EPS networks and the network coexisted schematic diagram of CDMA2000 in prior art;
Fig. 7 is the flow chart of the method for a kind of emergent session switching of the present invention;
Fig. 8 is that in the embodiment of the present invention, emergent session is promptly switched to the flow chart of CDMA2000 connecting system from 3GPP connecting system;
Fig. 9 is that in the embodiment of the present invention, emergent session is promptly switched to the flow chart of non-3GPP connecting system from 3GPP connecting system;
Figure 10 is the composition structural representation of the system of a kind of emergent session switching of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the present invention is further elaborated.
For UE in prior art, in source connecting system and target access system, carry out emergent session while switching, because the P-GW that target access system and source connecting system may be selected is inconsistent, and cause the problem of emergent session handoff failure.The invention provides a kind of method that emergent session switches, at UE, move to objective network region, and while initiating the urgent switching to target access system from source connecting system, in urgent handover request, carry the area information of source connecting system, target access system selects corresponding P-GW to realize urgent switching according to UE at the area information of source connecting system from static configuration data, thereby guarantees source connecting system and the local consistency of selecting of target access system P-GW.
Source connecting system in the present invention is 3GPP connecting system, and target access system is non-3GPP connecting system or CDMA2000 connecting system.That is to say, emergent session switching of the present invention comprises that 3GPP connecting system is to the urgent switching of non-3GPP connecting system, and 3GPP connecting system is to the urgent switching of CDMA2000 connecting system.As shown in Figure 7, urgent session switching method of the present invention mainly comprises the following steps:
Step 701, UE emergency attached is to source connecting system, the emergent session in concurrent origin connecting system.
When UE initiates emergency attached at 3GPP connecting system, the MME in 3GPP connecting system selects unique P-GW of the local emergent session business of serving configuring and sets up emergency bearing, and UE realizes IMS emergent session by the emergency bearing of setting up.
Step 702, UE moves to target access system, and source access network is according to measurement report, and when the radio signal quality of target access system is better than source connecting system, notice UE is switched to target access system by emergent session from source connecting system.
Step 703, UE sends urgent handover request to target access system, and the emergent session that source connecting system is set up in application is switched to target access system, in this urgent handover request, carries UE at the area information of source connecting system.This area information can be tracing area (TA, Tracking Area) information.
It is pointed out that this urgent handover request is emergency attached request message when emergent session is switched to non-3GPP connecting system from 3GPP connecting system; When emergent session is switched to CDMA2000 connecting system from 3GPP connecting system, this urgent handover request is urgent pre-registration request message.
Step 704, target access system is according to the area information in urgent handover request, search area information that the connecting system of the adjacency of self storing covers and the corresponding relation of P-GW, select the P-GW corresponding with area information in urgent handover request, and utilize selected P-GW to set up local emergency bearing.
Target access system, local static configuration is a plurality of while being the P-GW of urgency traffic service in abutting connection with 3GPP access network, is used each area information in abutting connection with 3GPP network and the P-GW that serves urgent switching to carry out corresponding, sets up the corresponding relation of area information and P-GW.
When UE moves to objective network region, and while initiating the urgent switching to target access system from 3GPP connecting system, in urgent handover request, carry the area information of 3GPP connecting system, target access system selects corresponding P-GW to realize urgent switching according to the area information of 3GPP connecting system from static configuration data, can guarantee so the local consistency of selecting of source connecting system and target access system P-GW.
Step 705, target access system is initiated emergency bearing update request to selected P-GW, and request is switched to the emergency bearing of source connecting system on the emergency bearing of target access system foundation.
Step 706, UE and target access system, selected P-GW set up emergency bearing passage, and carry out the switching of emergency bearing.
Step 707, after emergency bearing has switched, source connecting system discharges the bearing resource with UE, comprises radio bearer resources and access bearer resource.
The emergent session of take below is promptly switched to CDMA2000 connecting system from 3GPP connecting system and describes as example.In this embodiment, the unique P-GW that has urgency traffic to use in 3GPP connecting system static configuration, and in CDMA2000 connecting system except the P-GW that the urgency traffic of the 3GPP connecting system of a plurality of adjacency of static configuration is used, also need in static configuration table, configure the area information of the 3GPP network coverage and the corresponding relation of its P-GW of adjacency.When UE switches to CDMA2000 connecting system request emergent session, need to carry the area information of this UE in 3GPP network, CDMA2000 connecting system can carry out the P-GW that serves urgency traffic corresponding to unique selection according to the area information of UE place 3GPP network, and use this P-GW to set up emergency bearing, carry out emergent session and switch.Idiographic flow as shown in Figure 8, mainly comprises the following steps:
Step 801, in network configuration, 3GPP connecting system has unique P-GW of service urgency traffic in local static configuration.In CDMA2000 connecting system, in local static configuration data table, the P-GW of the service urgency traffic of each 3GPP connecting system of static configuration, and configure the area information of each 3GPP connecting system covering and the corresponding relation of P-GW.Area information can be the TA information of using in 3GPP connecting system.
Step 802, UE initiates, before emergent session, first to E-UTRAN, to initiate emergency attached request, and sign, emergency type, the network accessibility of UE, the information such as indication of request distributing IP of UE has been carried in this request.
Step 803, E-UTRAN is that UE selects one to be the MME of its service, and this emergency attached request is forwarded to this MME, carries the information such as sign, emergency type of UE in this message.
Step 804, MME judges that according to information such as emergency types it is emergency attached request, and skips the steps such as authentication, the unique P-GW for urgency traffic service of option and installment in the database of MME static configuration, as the packet gateway server of emergency bearing.
Step 805, MME is that UE selects a S-GW, and sends emergency bearing foundation request to it.The information of carrying in this request comprises: the sign of the sign of UE, urgent sign, MME, be the indication of UE distributing IP address, default bandwidth information, selected P-GW address etc.
Step 806, S-GW sends the request of setting up emergency bearing to the selected P-GW of MME.The information that this request is carried comprises: the address of S-GW, default bandwidth information, be the indication of UE distributing IP address, urgent sign etc.
Step 807, if needed, the decision informations such as the urgent qos policy that P-GW configures for this UE to PCRF request and charging regulation.
Step 808, the information such as the urgent qos policy that P-GW returns according to PCRF and charging regulation, set up emergency bearing, and to S-GW, return to emergency bearing and set up response.
Step 809, S-GW sends emergency bearing to MME and sets up response.
Step 810, MME sends emergency attached response to E-UTRAN, shows that UE emergency attached is accepted to the request of network.
Step 811, E-UTRAN sends voice emergency bearing to UE and sets up request, requires UE to preserve the important information that emergency bearing is set up, and open corresponding port.Wherein, above-mentioned voice bearer is set up in request and has been carried bearer network ID, P-GW address, the IP address of distributing to UE, bandwidth information etc.; After radio bearer is set up, UE sends voice emergency bearing to E-UTRAN and sets up response.
Step 812, E-UTRAN notice MME emergency attached process completes.
Step 813, MME sends more new bearer request to S-GW, notifies sign, address into the E-UTRAN of UE service; After bearer update success, S-GW sends more new bearer response to MME.
So far, UE promptly accesses EPS network by 3GPP connecting system, and has set up PMIP or GTP tunnel between S-GW and P-GW, has completed the foundation of emergency bearing.User can initiate emergent session request and carry out emergent session business on emergency bearing.
Step 814, UE moves to CDMA2000 network area and finds CDMA2000 connecting system, and initiates pre-registration request at CDMA2000 network.
Step 815, UE initiates urgent pre-registration request to CDMA2000 connecting system, request message is issued HRPD by E-UTRAN and MME, in message, carry the information such as UE sign and emergency type, also need to carry UE at the area information (as TA information) of 3GPP connecting system, set up HRPD session context with HRPD, thereby set up signalling path at CDMA2000 connecting system.
Step 816, HRPD is emergency attached request according to INFORMATION DISCOVERYs such as emergency attached signs, need to set up emergency bearing, HRPD is the area information at 3GPP connecting system according to the UE comprising in message, from local static configuration data, select unique P-GW of corresponding this area information, selected P-GW upgrades for follow-up emergency bearing.
Step 817, HSGW, before setting up emergency bearing, carries out IAD session control process with PCRF, gets urgent qos policy and charging regulation, and carries out the binding of carrying and session.
Step 818, UE initiates carrying to HSGW and sets up request, and request message is issued HSGW by E-UTRAN and MME, sets up HSGW session context, thereby sets up media channel at CDMA2000 connecting system.
Step 819, UE sends measurement report to E-UTRAN, and E-UTRAN finds that CDMA2000 radio signal quality is better than 3GPP wireless signal, and notifies UE to switch to CDMA2000 connecting system request emergent session.
Step 820, UE is by E-UTRAN and MME transparent transmission control signal passage on S101 interface, HRPD to CDMA2000 connecting system initiates urgent handover request, type of attachment is urgent switching type (Emergency Handover Type), comprises the sign of UE, the urgent information such as sign of switching in request message.
Step 821, HRPD applies for radio bearer resources, and sends address forwarding request to HSGW, carries the selected information such as P-GW address, HSGW returns to HSGW address in response message; HRPD returns to urgent switching acceptance response message to MME, carries the information such as HSGW address and CDMA2000 switching state.
Step 822, S-GW is to HSGW converting downlink data for MME notice, and notifies E-UTRAN to CDMA2000 connecting system downloading data path message, carries the information such as urgent switching is accepted, CDMA2000 connecting system switching state.
Step 823, the urgent handover request of E-UTRAN notice UE is accepted, and UE need to be switched to wireless signal CDMA2000 connecting system.
Step 824, UE is by CDMA2000 wireless access, and the message that has been linked into CDMA2000 connecting system to HRPD transmission is to HRPD, notifies HRPD to access.
Step 825, HRPD initiates emergency bearing request to HSGW, and request emergent session is switched to the emergency bearing of CDMA2000 from the emergency bearing of 3GPP.
Step 826, HSGW sends agent binding update request to selected P-GW, and application is bundled in the former session port in 3GPP connecting system; P-GW processes agent binding update, and sends proxy binding acknowledgment messages to HSGW.
Step 827, HSGW returns to bearer update response message to HRPD, and notice HRPD bearer update completes.
Step 828, HRPD sends urgent handoff completion message to MME, just sets up like this emergency bearing and completed the emergency bearing of 3GPP to the switching of CDMA2000 emergency bearing between UE and CDMA2000 connecting system.
Subsequently, CDMA2000 connecting system just and between P-GW is set up PMIP tunnel.UE can access by CDMA2000 connecting system, and sends or receive IP packet by P-GW, and emergent session has switched.
The emergent session of take again below is promptly switched to non-3GPP connecting system from 3GPP connecting system and describes as example.In this embodiment, in 3GPP connecting system, static configuration has unique P-GW that urgency traffic is used, and in non-3GPP connecting system except the P-GW that the urgency traffic of the 3GPP connecting system of a plurality of adjacency of static configuration is used, also need in static configuration table, configure in abutting connection with the area information of the 3GPP network coverage and the corresponding relation of its P-GW.When UE switches to non-3GPP connecting system request emergent session, need to carry the area information of UE in 3GPP network, non-3GPP connecting system can carry out the P-GW that serves urgency traffic corresponding to unique selection according to the area information of UE place 3GPP network, and use selected P-GW to set up emergency bearing, carry out emergent session and switch.Idiographic flow as shown in Figure 9, mainly comprises the following steps:
Step 901, in network configuration, 3GPP connecting system has unique P-GW of service urgency traffic in local static configuration; In non-3GPP connecting system, in local static configuration data table, each P-GW in abutting connection with the service urgency traffic of 3GPP connecting system of static configuration, and configure the area information of each 3GPP connecting system covering and the corresponding relation of P-GW.Area information can be the TA information of using in 3GPP connecting system.
Step 902～913, UE promptly accesses the process of EPS network by 3GPP connecting system, identical with step 302～313 in Fig. 8, repeats no more herein.
Step 914, UE moves to non-3GPP network area and finds non-3GPP connecting system, and UE determines to initiate emergent session and switches.
Step 915, UE initiates emergency attached request to non-3GPP connecting system, and type of attachment is Emergency Handover Type, comprises the sign of UE, the urgent information such as sign of switching in request message; In message, also need to carry UE at the area information (as TA information) of 3GPP connecting system.
Step 916, the control network element of non-3GPP connecting system is urgent handover request according to INFORMATION DISCOVERYs such as emergency attached signs, need to set up emergency bearing, non-3GPP connecting system is the area information at 3GPP connecting system according to the UE comprising in message, from local static configuration data, select unique P-GW of corresponding this area information, for follow-up emergency bearing, upgrade.
Step 917, non-3GPP connecting system and PCRF carry out IAD session control process, and non-3GPP connecting system gets urgent qos policy and charging regulation information, and carries out the binding of carrying and session.
Step 918, non-3GPP connecting system sends agent binding update messages to selected P-GW, and application is bundled in the former session port in 3GPP connecting system.
Step 919, P-GW is to PCRF initiation session modify request messages, and PCRF returns to session modification acknowledge message to P-GW, carries urgent Qos strategy and charging regulation, and carried out by P-GW in this message.
Step 920, P-GW processes agent binding update, and sends proxy binding acknowledgment messages to non-3GPP connecting system.
Step 921, non-3GPP connecting system sends emergency attached to UE and completes message, just sets up emergency bearing like this and completed the emergency bearing of 3GPP to the switching of non-3GPP emergency bearing between UE and non-3GPP connecting system.
Subsequently, non-3GPP connecting system just and between P-GW is set up PMIP tunnel, and UE can access by non-3GPP connecting system, and sends or receive IP packet by P-GW, and emergent session has switched.
The method of switching for realizing above-mentioned emergent session, the system that the present invention also provides a kind of emergent session to switch, as shown in figure 10, this system comprises: UE 10, source connecting system 20 and target access system 30.
UE 10, for when needs are switched to target access system 30 by emergent session from source connecting system 20, to target access system 30, send urgent handover request, in this urgent handover request, carry UE 10 at the area information of source connecting system 20.
Source connecting system 20, for before emergent session switches, for UE 10 provides emergent session service.
Target access system 30, area information for the urgent handover request of basis, search area information that the connecting system of the adjacency of self storing covers and the corresponding relation of P-GW, select the P-GW corresponding with area information in urgent handover request, and utilize the switching of selected P-GW execution emergent session.
It is pointed out that the source connecting system 20 in the present invention can be 3GPP connecting system, target access system 30 can be non-3GPP connecting system or CDMA2000 connecting system.And when emergent session is switched to non-3GPP connecting system from 3GPP connecting system, urgent handover request is emergency attached request message; When emergent session is switched to CDMA2000 connecting system from 3GPP connecting system, urgent handover request is urgent pre-registration request message.
UE 10 also for, before sending urgent handover request, emergency attached is to source connecting system 20, the emergent session in concurrent origin connecting system 20; After moving to the overlay area of target access system 30, measurement report is sent to source access network, when the radio signal quality of target access system 30 is better than source connecting system 20, source access network notice UE 10 is switched to target access system 30 by emergent session from source connecting system 20.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. the method that emergent session switches, is characterized in that, the method comprises:
User terminal UE, when needs are switched to target access system by emergent session from source connecting system, sends urgent handover request to described target access system, in described urgent handover request, carries described UE at the area information of described source connecting system;
Described target access system is when local static configuration is respectively the data network gateway P-GW of urgency traffic service in abutting connection with 3GPP access network, use described each area information in abutting connection with 3GPP access network and the P-GW that serves urgent switching to carry out corresponding, set up the corresponding relation of described area information and described P-GW;
Described target access system is according to the area information in described urgent handover request, search the connecting system area information covering and the corresponding relation of serving the data network gateway P-GW of urgency traffic of the adjacency of self storing, select the P-GW that serve urgency traffic corresponding with area information in described urgent handover request, and adopt selected switching of serving the P-GW execution emergent session of urgency traffic.
2. the method that emergent session switches according to claim 1, is characterized in that, described source connecting system is third generation partner program 3GPP connecting system, and described target access system is non-3GPP connecting system or code division multiple access CDMA2000 connecting system.
3. the method that emergent session switches according to claim 2, is characterized in that, the method further comprises:
When described emergent session is switched to non-3GPP connecting system from 3GPP connecting system, described urgent handover request is emergency attached request message;
When described emergent session is switched to CDMA2000 connecting system from 3GPP connecting system, described urgent handover request is urgent pre-registration request message.
4. the method that emergent session switches according to claim 2, is characterized in that, before described UE sends urgent handover request to target access system, the method further comprises:
Described UE emergency attached arrives source connecting system, and initiates the emergent session in the connecting system of described source;
Described UE moves to behind the overlay area of target access system, source access network is according to measurement report, when the radio signal quality of described target access system is better than described source connecting system, notify described UE that emergent session is switched to target access system from source connecting system.
5. the method that emergent session switches according to claim 2, is characterized in that, described target access system adopts the selected P-GW that serves urgency traffic to carry out the switching of emergent session, is specially:
Described target access system adopts the selected P-GW that serves urgency traffic to set up local emergency bearing, and initiates emergency bearing update request to the selected P-GW that serves urgency traffic;
Described UE and target access system, the selected P-GW that serves urgency traffic set up emergency bearing passage, and carry out the switching of emergency bearing;
After emergency bearing handover success, described source connecting system discharges the bearing resource with UE.
6. the method for switching according to emergent session described in any one in claim 1 to 5, is characterized in that, described UE is tracing area TA information at the area information of source connecting system.
7. the system that emergent session switches, is characterized in that, this system comprises: UE, source connecting system and target access system, wherein,
Described UE, for when needs are switched to target access system by emergent session from described source connecting system, sends urgent handover request to described target access system, in described urgent handover request, carries described UE at the area information of described source connecting system;
Described source connecting system, for before emergent session switches, for described UE provides emergent session service;
Described target access system, for when local static configuration is respectively the data network gateway P-GW of urgency traffic service in abutting connection with 3GPP access network, use described each area information in abutting connection with 3GPP access network and the P-GW that serves urgent switching to carry out corresponding, set up the corresponding relation of described area information and described P-GW;
Described target access system, also for according to the area information of described urgent handover request, search the connecting system area information covering and the corresponding relation of serving the P-GW of urgency traffic of the adjacency of self storing, select the P-GW that serve urgency traffic corresponding with area information in described urgent handover request, and adopt selected switching of serving the P-GW execution emergent session of urgency traffic.
8. the system that emergent session switches according to claim 7, is characterized in that, described source connecting system is 3GPP connecting system, and described target access system is non-3GPP connecting system or CDMA2000 connecting system.
9. the system that emergent session switches according to claim 8, is characterized in that,
When described emergent session is switched to non-3GPP connecting system from 3GPP connecting system, described urgent handover request is emergency attached request message;
When described emergent session is switched to CDMA2000 connecting system from 3GPP connecting system, described urgent handover request is urgent pre-registration request message.
10. the system that emergent session switches according to claim 8, it is characterized in that, described UE is further used for, before sending urgent handover request, emergency attached is to source connecting system, and initiate the emergent session in the connecting system of described source, after moving to the overlay area of target access system, measurement report is issued to source access network, when the radio signal quality of described target access system is better than described source connecting system, source access network notifies described UE that emergent session is switched to target access system from source connecting system.
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| CN101291535A (en) * | 2008-06-11 | 2008-10-22 | 中兴通讯股份有限公司 | Method and system for terminal to switch among different networks |
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| CN101111067A (en) * | 2006-07-21 | 2008-01-23 | 华为技术有限公司 | Mobile terminal and communication method for gateway access |
| CN101291535A (en) * | 2008-06-11 | 2008-10-22 | 中兴通讯股份有限公司 | Method and system for terminal to switch among different networks |
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