CN101945365A - Method and system for switching emergency session - Google Patents
Method and system for switching emergency session Download PDFInfo
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- CN101945365A CN101945365A CN2009100886859A CN200910088685A CN101945365A CN 101945365 A CN101945365 A CN 101945365A CN 2009100886859 A CN2009100886859 A CN 2009100886859A CN 200910088685 A CN200910088685 A CN 200910088685A CN 101945365 A CN101945365 A CN 101945365A
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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 the 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 the territory progressively is 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 are formed.
The access of non-3GPP IP Access Network is promptly supported in the intercommunication of EPS network support and non-3 GPP access network network.The intercommunication of EPS network and non-3 GPP access network network realizes that by the S2a/b/c interface 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 the EPS network) and non-3 GPP access network network two parts.Wherein, the 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 the 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 the P-GW is the S2b interface.
In the scheme that 3GPP provides, 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 the 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) directly is connected with P-GW by the S2a interface; HSGW also is connected with S-GW by the S103 interface; (the HRPD of high-speed packet data network unit of CDMA2000 access network, HighRate Packet Data) directly is connected with MME by the S101 interface, but transparent transmission user terminal on S101 signaling tunnel (UE, User Equipment) is to adhering to carrying foundation of HRPD waiting signaling message.
Urgent call (Emergency Call) is distinctive a kind of voice service function in the mobile communication system, and urgent call all is to realize in circuit switching (CS, Circuit Switch) territory usually.At present, along with the IPization of network, packet switching (PS, Packet Switch) territory also begins to support emergence call service, and carries out call signaling control by IMS on the PS territory, to realize urgent call.The emergence call service that the IMS territory provides abbreviates the IMS urgent call as, the IMS urgent call need realize the 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 the 3GPP connecting system to the CDMA2000 connecting system in the prior art as shown in Figure 3, mainly may further comprise the steps:
Step 301～302, UE need set up emergency bearing at the EPS network before initiating emergent session, initiates the IMS emergent session then on emergency bearing; UE at first 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 a local P-GW and a S-GW for the urgency traffic service in the database of static configuration, send emergency bearing to selected S-GW and set up request, by S-GW the emergency bearing request of setting up is transmitted to P-GW.
Step 308, MME sends the emergency attached response to E-UTRAN, shows that the request of UE emergency attached is accepted.
Step 309, E-UTRAN sends the 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 ports; UE returns the voice emergency bearing to E-UTRAN and sets up response.
Step 310, E-UTRAN notice MME emergency attached process is finished.
Step 311, MME sends more new bearer request to S-GW, and after institute's bearer update success, sends more new bearer response to MME.
So far, UE promptly inserts the EPS network by the 3GPP connecting system, and set up proxy-mobile IP between S-GW and P-GW (PMIP, Proxy Mobile IP) or conventional data transmission platform (GTP, General Data Transfer Platform) foundation of emergency bearing has been finished in the tunnel.The user can initiate the emergent session request and carry out the emergent session business on emergency bearing.
Step 312～313, UE moves to the CDMA2000 network area and finds the CDMA2000 connecting system, initiates urgent pre-registration request to the CDMA2000 connecting system, and request message is issued HRPD by E-UTRAN and MME, sets up the HRPD session context with HRPD.
Step 314, HRPD selects to be used for the P-GW of urgency traffic service from the database of static configuration.
The selected P-GW of HRPD need guarantee that the P-GW that uses with the 3GPP connecting system is consistent, otherwise can't realize the switching of emergent session.
Step 315, HSGW carries out IAD session control process with PCRF before setting up emergency bearing, get access to 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 transparent transmission control signalling path on the S101 interface by E-UTRAN and MME, initiates urgent handoff request to the HRPD of CDMA2000 connecting system; HRPD applies for radio bearer resources, and changes request before HSGW sends the address, carries information such as P-GW address.HSGW returns the HSGW address in response message.HRPD returns urgent switching acceptance response message to MME, carries information such as HSGW address and CDMA2000 switching state.
Step 320, S-GW is to HSGW converting downlink data for the MME notice, and notice E-UTRAN carries information such as urgent switching is accepted, CDMA2000 switching state to CDMA2000 data download path message.
Step 321～322, the urgent handoff request of E-UTRAN notice UE is accepted, and UE need switch to wireless signal the CDMA2000 connecting system, and transmission has been linked into the message of CDMA2000 connecting system to HRPD.
Step 323, HRPD initiates the emergency bearing update request to HSGW, and the request emergent session switches on the emergency bearing of CDMA2000 from the emergency bearing of EPS.
Step 324, HSGW sends the agent binding update request to selected P-GW, and application is bundled in the former session port in the EPS system; P-GW handles agent binding update, and sends proxy binding acknowledgment messages to HSGW.
Step 325, HSGW returns the bearer update response message to HRPD, and notice HRPD bearer update is finished.
Step 326, HRPD sends urgent handoff completion message to MME, just sets up emergency bearing like this between UE and the CDMA2000 connecting system and has finished the switching of the emergency bearing of EPS to the CDMA2000 emergency bearing.
The emergent session switching flow of UE from the 3GPP connecting system to non-3GPP connecting system in the prior art as shown in Figure 4, mainly may further comprise the steps:
Step 401～411, UE promptly inserts the process of EPS network by the 3GPP connecting system, and is identical with step 301～311 among Fig. 3, repeats no more herein.
Step 412～414, UE moves to non-3GPP network area and finds non-3GPP connecting system, and the emergent session switching is initiated in decision; UE initiates emergency attached request to non-3GPP connecting system, and the control network element of non-3GPP connecting system selects to be used for the P-GW of urgency traffic service from the database of static configuration.
Selected P-GW need guarantee that the P-GW that uses with the 3GPP connecting system is consistent, otherwise can't realize the switching of emergent session.
Step 415, non-3GPP connecting system and PCRF carry out IAD session control process, get access to 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 the 3GPP connecting system.
Step 417, P-GW is to PCRF initiation session modify request messages, and PCRF returns the session modification acknowledge message to P-GW, carries urgent Qos strategy and charging regulation in this message, and is carried out by P-GW.
Step 418, P-GW handles 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 finishes message, just sets up emergency bearing between UE and the non-3GPP connecting system like this and has finished the switching of the emergency bearing of 3GPP to non-3GPP emergency bearing.
From above-mentioned Fig. 3 and urgent switching flow shown in Figure 4, as can be seen,, need in advance that static configuration is the local P-GW of emergent session service in network for emergency attached and the urgent process of switching; When UE initiates emergency attached or urgent handoff request, network need 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 that like this emergency attached or emergency bearing 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 can't carry out the renewal and the switching of emergency bearing, can cause the failure of urgent switching.
In the network design of reality, the EPS network of 3GPP can not disposable making the overall arrangement for, and the mode that adopts the focus city to launch is usually expanded, and this just exists a plurality of EPS networks and non-3GPP network or the network coexisted problem of 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 the emergent session service switchover, need in the data of static configuration, dispose the P-GW that a plurality of EPS networks are used for emergent session service, move to non-3GPP network or the CDMA2000 network can guarantee the professional successful property of switching of emergent session from any EPS network like this.
Yet, adopting the configuration of a plurality of P-GW to have with prior art in non-3GPP network or CDMA2000 network conflicts, that is to say that prior art can't guarantee that the following UE of a plurality of P-GW configurations moves to the successful property of non-3GPP network or CDMA2000 network from the 3GPP 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, main purpose of the present invention is to provide a kind of method and system of emergent session switching, with solve in the prior art emergent session from the 3GPP network when non-3GPP network or CDMA2000 network switch cause the problem of handoff failure easily because the P-GW that selects is inconsistent.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides the method that a kind of emergent session switches, this method comprises:
User terminal UE needs with emergent session when the source connecting system switches to target access system, send urgent handoff request to described target access system, carry the area information of described UE in the described urgent handoff request at described source connecting system;
Described target access system is according to the area information in the described urgent handoff request, search the area information that connecting system covered of the adjacency of self storing and the corresponding relation of data network gateway P-GW, the corresponding P-GW of area information in selection and the described urgent handoff request, and adopt selected P-GW to carry out the switching of emergent session.
Described source connecting system is a 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.
This method further comprises:
When described emergent session switched to non-3GPP connecting system from the 3GPP connecting system, described urgent handoff request was an emergency attached request message;
When described emergent session switched to the CDMA2000 connecting system from the 3GPP connecting system, described urgent handoff request was urgent pre-registration request message.
Before target access system sent urgent handoff request, this method further comprised at described UE:
Described UE emergency attached arrives the source connecting system, and initiates the emergent session in the connecting system of described source;
After described UE moves to the overlay area of target access system, the 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 the 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 the emergency bearing update request to selected P-GW;
Described UE and target access system, selected P-GW set up the emergency bearing passage, and carry out the switching of emergency bearing;
Behind the emergency bearing handover success, described source connecting system discharges the bearing resource with UE.
Described UE is a 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, be used for needs with emergent session when described source connecting system switches to target access system, send urgent handoff request to described target access system, carry the area information of described UE in the described urgent handoff request at described source connecting system;
Described source connecting system is used for before emergent session switches, for described UE provides the emergent session service;
Described target access system, be used for area information according to described urgent handoff request, search the area information that connecting system covered of the adjacency of self storing and the corresponding relation of P-GW, the corresponding P-GW of area information in selection and the described urgent handoff request, and adopt selected P-GW to carry out the switching of emergent session.
Described source connecting system is the 3GPP connecting system, and described target access system is non-3GPP connecting system or CDMA2000 connecting system.
When described emergent session switched to non-3GPP connecting system from the 3GPP connecting system, described urgent handoff request was an emergency attached request message;
When described emergent session switched to the CDMA2000 connecting system from the 3GPP connecting system, described urgent handoff request was urgent pre-registration request message.
Described UE is further used for, before sending urgent handoff request, emergency attached is to the source connecting system, and initiate emergent session in the connecting system of described source, after moving to the overlay area of target access system, measurement report is issued the source access network, and when the radio signal quality of described target access system was better than described source connecting system, the source access network notified described UE that emergent session is switched to target access system from the source connecting system.
The method and system that a kind of emergent session provided by the present invention switches, move to the objective network zone at UE, and when initiating urgent switching to target access system (non-3GPP connecting system or CDMA2000 connecting system) from source connecting system (3GPP connecting system), in urgent handoff request, carry the area information of source connecting system, target access system selects corresponding P-GW to realize urgent the switching according to UE from static configuration data at the area information of source connecting system, can guarantee the local consistency of selecting of source connecting system and target access system P-GW like this, thereby guarantee that UE can successfully switch to target access system with emergent session from the source connecting system, realize the continuity business of emergent session.
Description of drawings
Fig. 1 is the system architecture schematic diagram of EPS network and non-3GPP network interoperability in the prior art;
Fig. 2 is the system architecture schematic diagram of EPS network and CDMA2000 network interoperability in the prior art;
Fig. 3 is the flow chart that the emergent session of UE from the 3GPP connecting system to the CDMA200 connecting system switches in the prior art;
Fig. 4 is the flow chart that the emergent session of UE from the 3GPP connecting system to non-3GPP connecting system switches in the prior art;
Fig. 5 is a plurality of EPS networks and the network coexisted schematic diagram of non-3GPP in the prior art;
Fig. 6 is a plurality of EPS networks and the network coexisted schematic diagram of CDMA2000 in the prior art;
Fig. 7 is the flow chart of the method for a kind of emergent session switching of the present invention;
Fig. 8 promptly switches to the flow chart of CDMA2000 connecting system from the 3GPP connecting system for emergent session in the embodiment of the invention;
Fig. 9 promptly switches to the flow chart of non-3GPP connecting system from the 3GPP connecting system for emergent session in the embodiment of the invention;
Figure 10 is the composition structural representation of the system of a kind of emergent session switching of the present invention.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
Carry out emergent session when switching at UE in the prior art in source connecting system and target access system,, and cause the problem of emergent session handoff failure because the P-GW that target access system and source connecting system may be selected for use is inconsistent.The invention provides the method that a kind of emergent session switches, move to the objective network zone at UE, and when initiating urgent switching to target access system from the source connecting system, in urgent handoff request, carry the area information of source connecting system, target access system selects corresponding P-GW to realize urgent the switching according to UE from static configuration data at the area information of source connecting system, thereby guarantees source connecting system and the local consistency of selecting of target access system P-GW.
Source connecting system among the present invention is the 3GPP connecting system, and target access system is non-3GPP connecting system or CDMA2000 connecting system.That is to say that emergent session switching of the present invention comprises the urgent switching of 3GPP connecting system to non-3GPP connecting system, and the 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 may further comprise the steps:
Step 701, the UE emergency attached arrives the source connecting system, the emergent session in the concurrent origin connecting system.
When UE initiated emergency attached at the 3GPP connecting system, the MME in the 3GPP connecting system selected unique P-GW of the local emergent session business of serving that disposes and sets up emergency bearing, and UE realizes the IMS emergent session by the emergency bearing of setting up.
Step 702, UE moves to target access system, and the source access network is according to measurement report, and when the radio signal quality of target access system was better than the source connecting system, notice UE switched to target access system with emergent session from the source connecting system.
Step 703, UE sends urgent handoff request to target access system, and the emergent session that the source connecting system is set up in application switches to target access system, carries the area information of UE at the source connecting system in this urgent handoff request.This area information can be tracing area (TA, a Tracking Area) information.
It is pointed out that when emergent session when the 3GPP connecting system switches to non-3GPP connecting system, this urgent handoff request is an emergency attached request message; When emergent session when the 3GPP connecting system switches to the CDMA2000 connecting system, this urgent handoff request is urgent pre-registration request message.
Step 704, target access system is according to the area information in the urgent handoff request, search the area information that connecting system covered of the adjacency of self storing and the corresponding relation of P-GW, the corresponding P-GW of area information in selection and the urgent handoff request, and utilize selected P-GW to set up local emergency bearing.
Target access system is a plurality of when the 3GPP access network is the P-GW of urgency traffic service in local static configuration, and it is corresponding to use each to carry out in abutting connection with the area information of 3GPP network and the P-GW that serves urgent switching, sets up the corresponding relation of area information and P-GW.
When UE moves to the objective network zone, and when initiating urgent switching to target access system from the 3GPP connecting system, in urgent handoff request, carry the area information of 3GPP connecting system, target access system selects corresponding P-GW to realize urgent the switching from static configuration data according to the area information of 3GPP connecting system, can guarantee the local consistency of selecting of source connecting system and target access system P-GW like this.
Step 705, target access system is initiated the emergency bearing update request to selected P-GW, and request switches 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 the emergency bearing passage, and carry out the switching of emergency bearing.
Step 707, after the emergency bearing switching was finished, the source connecting system discharged the bearing resource with UE, comprises radio bearer resources and access bearer resource.
Promptly switching to the CDMA2000 connecting system with emergent session from the 3GPP connecting system below is that example describes.Among this embodiment, unique P-GW that the urgency traffic use is arranged in 3GPP connecting system static configuration, and in the CDMA2000 connecting system except that the employed P-GW of urgency traffic of the 3GPP connecting system of a plurality of adjacency of static configuration, also need in the static configuration table, dispose the area information of the 3GPP network coverage of adjacency and the corresponding relation of its P-GW.When UE when CDMA2000 connecting system request emergent session switches, need carry the area information of this UE in the 3GPP network, the CDMA2000 connecting system can come the P-GW that serves urgency traffic of unique selection correspondence 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 mainly may further comprise the steps as shown in Figure 8:
Step 801, in network configuration, the 3GPP connecting system has unique P-GW of service urgency traffic in local static configuration.In the 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 dispose 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 the 3GPP connecting system.
Step 802 before UE initiates emergent session, is at first initiated emergency attached request to E-UTRAN, and the sign, emergency type, the network accessibility of UE, the information such as indication of request distributing IP of UE 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 an emergency attached request, and skips step such as authentication, selects the unique P-GW that serves for urgency traffic of configuration 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 808, information such as urgent qos policy that P-GW returns according to PCRF and charging regulation are set up emergency bearing, and return emergency bearing to S-GW and set up response.
Step 809, S-GW sends emergency bearing to MME and sets up response.
Step 810, MME sends the emergency attached response to E-UTRAN, shows that the UE emergency attached is accepted to the request of network.
Step 811, E-UTRAN sends the 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 ports.Wherein, above-mentioned voice bearer is set up in the request and has been carried bearer network ID, P-GW address, the IP address of distributing to UE, bandwidth information etc.; After radio bearer was set up, UE sent the voice emergency bearing to E-UTRAN and sets up response.
Step 812, E-UTRAN notice MME emergency attached process is finished.
Step 813, MME sends more new bearer request to S-GW, notifies sign, address into the E-UTRAN of UE service; After the bearer update success, S-GW sends more new bearer response to MME.
So far, UE promptly inserts the EPS network by the 3GPP connecting system, and has set up PMIP or GTP tunnel between S-GW and P-GW, has finished the foundation of emergency bearing.The user can initiate the emergent session request and carry out the emergent session business on emergency bearing.
Step 814, UE moves to the CDMA2000 network area and finds the CDMA2000 connecting system, and initiates pre-registration request at the CDMA2000 network.
Step 815, UE initiates urgent pre-registration request to the CDMA2000 connecting system, request message is issued HRPD by E-UTRAN and MME, carry information such as UE sign and emergency type in the message, also need to carry the area information (as TA information) of UE at the 3GPP connecting system, set up the HRPD session context with HRPD, thereby set up signalling path at the CDMA2000 connecting system.
Step 816, HRPD is an emergency attached request according to INFORMATION DISCOVERYs such as emergency attached signs, need set up emergency bearing, HRPD is according to the area information of the UE that comprises in the message at the 3GPP connecting system, select unique P-GW of corresponding this area information from local static configuration data, selected P-GW is used for follow-up emergency bearing to be upgraded.
Step 817, HSGW carries out IAD session control process with PCRF before setting up emergency bearing, get access to 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 the HSGW session context, thereby sets up media channel at the CDMA2000 connecting system.
Step 819, UE sends measurement report to E-UTRAN, and E-UTRAN finds that the CDMA2000 radio signal quality is better than the 3GPP wireless signal, and notice UE switches to CDMA2000 connecting system request emergent session.
Step 820, UE is transparent transmission control signalling path on the S101 interface by E-UTRAN and MME, initiate urgent handoff request to the HRPD of CDMA2000 connecting system, type of attachment is urgent switching type (Emergency Handover Type), comprises information such as the sign of UE, urgent switching sign in the request message.
Step 821, HRPD applies for radio bearer resources, and changes request before HSGW sends the address, carries selected information such as P-GW address, HSGW returns the HSGW address in response message; HRPD returns urgent switching acceptance response message to MME, carries information such as HSGW address and CDMA2000 switching state.
Step 822, S-GW is to HSGW converting downlink data for the MME notice, and notice E-UTRAN carries information such as urgent switching is accepted, CDMA2000 connecting system switching state to CDMA2000 connecting system data download path message.
Step 823, the urgent handoff request of E-UTRAN notice UE is accepted, and UE need switch to wireless signal the CDMA2000 connecting system.
Step 824, UE is by the CDMA2000 wireless access, and to HRPD send be linked into the CDMA2000 connecting system message to HRPD, notice HRPD inserts.
Step 825, HRPD initiates the emergency bearing request to HSGW, and the request emergent session switches on the emergency bearing of CDMA2000 from the emergency bearing of 3GPP.
Step 826, HSGW sends the agent binding update request to selected P-GW, and application is bundled in the former session port in the 3GPP connecting system; P-GW handles agent binding update, and sends proxy binding acknowledgment messages to HSGW.
Step 827, HSGW returns the bearer update response message to HRPD, and notice HRPD bearer update is finished.
Step 828, HRPD sends urgent handoff completion message to MME, just sets up emergency bearing like this between UE and the CDMA2000 connecting system and has finished the switching of the emergency bearing of 3GPP to the CDMA2000 emergency bearing.
Subsequently, the CDMA2000 connecting system just and between P-GW is set up the PMIP tunnel.UE can insert by the CDMA2000 connecting system, and sends or receive the IP packet by P-GW, and emergent session switches to be finished.
Promptly switching to non-3GPP connecting system with emergent session from the 3GPP connecting system more below is that example describes.Among this embodiment, static configuration has unique P-GW that urgency traffic uses in the 3GPP connecting system, and in non-3GPP connecting system except that the P-GW that the urgency traffic of the 3GPP connecting system of a plurality of adjacency of static configuration uses, also need in the static configuration table, dispose in abutting connection with the area information of the 3GPP network coverage and the corresponding relation of its P-GW.When UE when non-3GPP connecting system request emergent session switches, need carry the area information of UE in the 3GPP network, non-3GPP connecting system can come the P-GW that serves urgency traffic of unique selection correspondence 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 mainly may further comprise the steps as shown in Figure 9:
Step 901, in network configuration, the 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 of static configuration in abutting connection with the service urgency traffic of 3GPP connecting system, and dispose 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 the 3GPP connecting system.
Step 902～913, UE promptly inserts the process of EPS network by the 3GPP connecting system, and is identical with step 302～313 among Fig. 8, repeats no more herein.
Step 914, UE moves to non-3GPP network area and finds non-3GPP connecting system, and the emergent session switching is initiated in the UE decision.
Step 915, UE initiates emergency attached request to non-3GPP connecting system, and type of attachment is Emergency Handover Type, comprises information such as the sign of UE, urgent switching sign in the request message; Also need to carry the area information (as TA information) of UE in the message at the 3GPP connecting system.
Step 916, the control network element of non-3GPP connecting system is urgent handoff request according to INFORMATION DISCOVERYs such as emergency attached signs, need set up emergency bearing, non-3GPP connecting system is according to the area information of the UE that comprises in the message at the 3GPP connecting system, from local static configuration data, select unique P-GW of corresponding this area information, be used for follow-up emergency bearing and upgrade.
Step 917, non-3GPP connecting system and PCRF carry out IAD session control process, and non-3GPP connecting system gets access to 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 the 3GPP connecting system.
Step 919, P-GW is to PCRF initiation session modify request messages, and PCRF returns the session modification acknowledge message to P-GW, carries urgent Qos strategy and charging regulation in this message, and is carried out by P-GW.
Step 920, P-GW handles 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 finishes message, just sets up emergency bearing between UE and the non-3GPP connecting system like this and has finished the switching of the emergency bearing of 3GPP to non-3GPP emergency bearing.
Subsequently, non-3GPP connecting system just and between P-GW is set up the PMIP tunnel, and UE can insert by non-3GPP connecting system, and sends or receive the IP packet by P-GW, and emergent session switches to be finished.
Be the method that realizes that above-mentioned emergent session switches, 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.
It is pointed out that the source connecting system 20 among the present invention can be the 3GPP connecting system, target access system 30 can be non-3GPP connecting system or CDMA2000 connecting system.And when emergent session when the 3GPP connecting system switches to non-3GPP connecting system, urgent handoff request is an emergency attached request message; When emergent session when the 3GPP connecting system switches to the CDMA2000 connecting system, urgent handoff request is urgent pre-registration request message.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the method switched of an emergent session is characterized in that this method comprises:
User terminal UE needs with emergent session when the source connecting system switches to target access system, send urgent handoff request to described target access system, carry the area information of described UE in the described urgent handoff request at described source connecting system;
Described target access system is according to the area information in the described urgent handoff request, search the area information that connecting system covered of the adjacency of self storing and the corresponding relation of data network gateway P-GW, the corresponding P-GW of area information in selection and the described urgent handoff request, and adopt selected P-GW to carry out the switching of emergent session.
2. the method for switching according to the described emergent session of claim 1 is characterized in that described source connecting system is a 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. according to the method for the described emergent session switching of claim 2, it is characterized in that this method further comprises:
When described emergent session switched to non-3GPP connecting system from the 3GPP connecting system, described urgent handoff request was an emergency attached request message;
When described emergent session switched to the CDMA2000 connecting system from the 3GPP connecting system, described urgent handoff request was urgent pre-registration request message.
4. according to the method for the described emergent session switching of claim 2, it is characterized in that before target access system sent urgent handoff request, this method further comprised at described UE:
Described UE emergency attached arrives the source connecting system, and initiates the emergent session in the connecting system of described source;
After described UE moves to the overlay area of target access system, the 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 the source connecting system.
5. the method for switching according to the described emergent session of claim 2 is characterized in that, 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 the emergency bearing update request to selected P-GW;
Described UE and target access system, selected P-GW set up the emergency bearing passage, and carry out the switching of emergency bearing;
Behind the emergency bearing handover success, described source connecting system discharges the bearing resource with UE.
6. the method for switching according to each described emergent session in the claim 1 to 5 is characterized in that described UE is a tracing area TA information at the area information of source connecting system.
7. the system switched of an emergent session is characterized in that this system comprises: UE, source connecting system and target access system, wherein,
Described UE, be used for needs with emergent session when described source connecting system switches to target access system, send urgent handoff request to described target access system, carry the area information of described UE in the described urgent handoff request at described source connecting system;
Described source connecting system is used for before emergent session switches, for described UE provides the emergent session service;
Described target access system, be used for area information according to described urgent handoff request, search the area information that connecting system covered of the adjacency of self storing and the corresponding relation of P-GW, the corresponding P-GW of area information in selection and the described urgent handoff request, and adopt selected P-GW to carry out the switching of emergent session.
8. the system of switching according to the described emergent session of claim 7 is characterized in that described source connecting system is the 3GPP connecting system, and described target access system is non-3GPP connecting system or CDMA2000 connecting system.
9. the system that described according to Claim 8 emergent session switches is characterized in that,
When described emergent session switched to non-3GPP connecting system from the 3GPP connecting system, described urgent handoff request was an emergency attached request message;
When described emergent session switched to the CDMA2000 connecting system from the 3GPP connecting system, described urgent handoff request was urgent pre-registration request message.
10. the system that described according to Claim 8 emergent session switches, it is characterized in that, described UE is further used for, before sending urgent handoff request, emergency attached is to the source connecting system, and initiate emergent session in the connecting system of described source, after moving to the overlay area of target access system, measurement report is issued the source access network, when the radio signal quality of described target access system was better than described source connecting system, the source access network notified described UE that emergent session is switched to target access system from the source connecting system.
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