CN101577890B - Method for transferring emergency service sessions, and emergency service system - Google Patents
Method for transferring emergency service sessions, and emergency service system Download PDFInfo
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Abstract
The invention provides a method for transferring emergency service sessions, and an emergency service system. The method comprises the following steps that: after UE passes LTE/SAE network access and establishes an emergency service session anchored to an EHS with a PSAP, when the session needs to be transferred to CS domain access, an MME sends a transfer request message carrying emergency-session association information to the EHS; the EHS receives the transfer request message and then interacts with a target MSC of a CS domain so as to establish CS domain bearing resources between the EHS and the target MSC for the emergency service session; the EHS finds a remote session branch of the emergency service session according to the emergency-session association information, connects the remote session branch with the CS domain bearing resources, and then tells the UE to be connected from a GERAN or a UTRAN in the CS domain, wherein the remote session branch is the bearing resources of the emergency service session, which are established between the EHS and the PSAP before transfer is performed; and the EHS is positioned in a local network of the UE.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of changing method and urgency traffic system of urgency traffic session.
Background technology
In order to guarantee that speech business is at circuit switching (Circuit Switched, be called for short CS) territory and IP (network interconnection agreement, Internet Protocol) IP multimedia subsystem, IMS (IP Multimedia Core NetworkSubsystem, abbreviation IMS) continuity between the network, solution as shown in Figure 1 for traditional voice business continuity (Voice CallContinuity is called for short VCC).
Wherein, dual-mode user device (User Equipment, be called for short UE) at CS territory and IMS network all successfully after the registration, when UE in the CS territory or IMS network when initiating speech business, this speech business all anchors to professional and session service application server for continuity (the ServiceCentralization and Continuity Application Server of centralized control of IMS network, be called for short SCC AS) in, this moment, UE had two signs that SCC AS is known:
1) sign (Session Transfer URI is called for short STI) is switched in session, is used for expression user conversation is switched to the IMS network at operation layer from the CS territory, perhaps switches between packet domain (PS territory);
2) session Handover Number (Session Transfer Number is called for short STN) is used for expression user conversation is switched to the CS territory at operation layer from the IMS network.
Switch to the PS territory and insert when UE prepares a session of having set up inserted from the CS territory, perhaps insert from a PS territory when switching to another PS territory and inserting, UE carries the STI sign in the IMS network, SCC AS is initiated a session request; After receiving this conversation request, SCC AS switches to IMS network at operation layer from the CS territory with this session, perhaps switches to another PS territory from a PS territory.
When UE initiates speech business at the IMS network, prepare when the IMS network switches to the CS territory, UE in the CS territory with STN as called number, SCC AS is initiated a session request; After receiving this conversation request, SCC AS switches to the CS territory with the speech business of correspondence from the IMS network, thereby finishes whole switching.
Described above is that traditional VCC realizes principle, and wherein bimodulus UE must support Dual Radio (dual-mode dual-standby) simultaneously, promptly can initiate audio call at IMS network and CS territory simultaneously.
Development along with network architecture flattening, and multiple high-speed wideband moves the appearance of access way, the mobile communication standard tissue has proposed to be called as LTE/SAE (Long Term Evolution/SystemArchitecture Evolution, Long Term Evolution/System Architecture Evolution) next generation network framework, this network architecture makes the wireless communication system of evolution that higher transmission rate can be provided, shorter transmission delay, and has a lower cost, support 3GPP (3rd Generation Partnership Project simultaneously, third generation partner program) mobility between the inner connecting system, and the mobility between 3GPP connecting system and the non-3GPP connecting system etc.Simultaneously, LTE/SAE also will support original VCC function as a kind of access means of IMS network.
Yet, because UE battery power consumption under the bimodulus pattern is very big, and LTE/SAE itself has powerful reasons such as mobility management capabilities, single wireless channel (Single Radio) voice business continuity (Single Radio Voice Call Continuity is called for short SRVCC) technology has been proposed.The principle Organization Chart of the scheme of realization SRVCC as shown in Figure 2 at present.
Wherein the respective network elements of SAE has:
E-UTRAN (Evolved UTRAN, the universal land radio access web of evolution): i.e. the wireless access network of evolution is follow-on wireless access network, and higher up-downgoing speed can be provided, lower transmission delay and more reliable wireless transmission.
MME (Mobility Management Entity, Mobility Management Entity): be the chain of command functional entity, be in charge of and store the UE context (such as UE sign/user ID, mobility management states, user security parameters etc.), for the user distributes temporary mark, and when quartering at corresponding tracing area or network, is responsible for UE this user is carried out authentication.
SAE GW (SAE gateway): be the user plane functions entity, be responsible for the user face data route and handle, be divided into two kinds of Serving and PDN.Serving SAE GW (be called for short gateway, or S-GW) is mobile anchor point between SAE system and traditional 3GPP system and the mobile anchor point between the E-UTRAN; PDN GW (packet data network gateway) be used to the terminate downlink data of the UE that is in idle state is initiated paging when the downlink data that mails to UE arrives, and the context of management and storage UE, such as IP bearer service parameter and network internal routing iinformation etc.
Among Fig. 2, the 2G/3G mobile network comprises following network element:
Wireless access network comprises GERAN (the GSM EDGE Radio Access Network of 2G, strengthen the global system for mobile communications Radio Access Network of data rate) and the UTRAN (UniversalTerrestrial Radio Access Network, universal land radio access web) of 3G; Core net comprises circuit switching domain network element MSC (Mobile Switch Center, mobile switching centre) and grouping domain network element Serving GPRS Support Node (Serving GPRS Support Node is called for short SGSN).Wherein, MSC provides circuit voice business, circuit data service and short message service, and SGSN links to each other with SAE GW among the LTE/SAE, and packet switch domain service is provided.
Home subscriber server (Home Subscriber Server is called for short HSS), the data that are used to manage CS territory, PS territory and IMS network.
Among Fig. 2, the IMS network comprises: CSCF (Call Session Control Function, be called for short CSCF), MGCF (Media Gateway Control Function is called for short MGCF) waits core network element, and the SCC AS of realization VCC function.
Based on framework shown in Figure 2, UE can insert the IMS network by LTE/SAE, also can insert the IMS network by the PS territory (being GERAN/UTRAN and SGSN among Fig. 2) of 2G and 3G, enjoys the business of IMS network, can also insert simultaneously the CS territory of 2G and 3G, use CS business such as speech business.
More than the network for existing in the prior art in order to realize the continuity of single wireless channel voice business, need strengthen existing MSC.Enhanced MSC all links to each other with the MSC of CS domain core net unit of 2G/3G, the core network element in PS territory and the MME of LTE/SAE network.
Wherein, adopt Gs interface between the core network element SGSN in enhanced MSC and PS territory, be used between PS territory and CS territory, carrying out functions such as co-location renewal; MME adopts the Sv interface with control LTE/SAE server network element, is used to realize that SRVCC's switches the mutual of message when the LTE/SAE network switches to the 2G/3G network.
Enhanced MSC can link to each other with the MGCF of IMS territory network, also can directly pass through SIP (SessionInitial Protocol, initial session protocol) interface is connected to the IMS network, and all-calls can both be anchored among the SCC AS in IMS territory, guarantees the realization of VCC basic function.
Interface adopts E interface between enhanced MSC and the common MSC (hereinafter referred to as MSC), and E interface adopts MAP (Mobile Application Part is called for short MAP) signaling.The inter-office switchover mode in CS territory is adopted in switching between enhanced MSC and the MSC.
Be set to a network element if enhanced MSC and MSC merge, the interacting message between them is then realized at this network element internal.
Fig. 2 A is under SRVCC framework shown in Figure 2, and session is switched to the method flow diagram that (promptly inserting from GERAN/UTRAN) inserted in the CS territory from LTE/SAE network insertion (promptly inserting from E-UTRAN).In this flow process, single channel UE has set up a session by LTE/SAE access network and UE-B at the IMS network, and this Session Anchor has arrived among the SCC AS; Switching flow shown in Fig. 2 A may further comprise the steps:
A201, UE send measurement report to E-UTRAN after receiving the measurement request that LTE/SAE wireless net member E-UTRAN sends, comprise adjacent district information in this measurement report;
A202, E-UTRAN are according to the adjacent district information in the measurement report, and decision is initiated to switch, and therefore sends RELOCATION REQUEST message to MME;
A203, after MME receives RELOCATION REQUEST message, according to the information that wherein comprises, send RELOCATION REQUEST message forward to enhanced MSC, sign STN and user's integrated services digital network (Integrated Service Digital Network is called for short ISDN) number is switched in the territory of carrying the user in this message;
Above-mentioned STN and ISDN number are information and the configuration of MME according to the user, acquire from the HSS of correspondence.
A204, enhanced MSC sends MAP to MSC and prepares handoff request message;
A205, MSC send to switch to GERAN/UTRAN and require request message, and GERAN/UTRAN returns to switch to MSC and requires acknowledgement message;
A206, MSC returns MAP to enhanced MSC and prepares handover request ack message, carries Handover Number in this message, and this Handover Number is distributed by MSC;
A207, enhanced MSC sends the integrated digital service-user part signaling initial address message of (ISDN User Part is called for short ISUP) according to Handover Number to MSC, and MSC returns the Address Complete Message of ISUP to enhanced MSC;
A208, enhanced MSC by the IMS network MGCF and CSCF to the initial address message that SCC AS sends ISUP, carry STN and ISDN number in this message; ISDN number and STN are used to indicate SCC AS that the session of correspondence is switched to the CS territory at operation layer from the IMS network; SCC AS sends response message to enhanced MSC;
This step also can be that enhanced MSC directly sends the SIP conversation request message to SCC AS, the telecommunications universal resource identifier (telURI) of carrying STN in this message or being converted to by user's ISDN number; SCC AS returns SIP success message (200OK message) to enhanced MSC;
Enhanced MSC is by ISUP initial address message or SIP conversation request message in this step, and notice SCC AS need carry out voice business continuity and switch, and request SCC AS switches to CS territory at operation layer from the IMS network with respective session.
A209, enhanced MSC is returned relocation response message forward to MME;
A210, MME returns relocation response message to E-UTRAN;
A211, E-UTRAN returns the reorientation command messages to UE;
A212, UE send to switch to target GERAN/UTRAN and insert message;
A213 after GERAN/UTRAN detects switching, sends change detection to message to MSC;
A214, MSC are to the processing access signaling message of enhanced MSC transmission MAP, and notice enhanced MSC user terminal inserts from the CS territory;
A215, UE sends handoff completion message to GERAN/UTRAN;
A216, GERAN/UTRAN sends handoff completion message to MSC;
A217, MSC sends MAP_SEND_END_SIGNAL message (MAP sends end signal) message to enhanced MSC, and this message is used to notify the enhanced MSC user terminal to switch to the CS territory;
A218, MSC is to enhanced MSC loopback ISUP response message (the ISUP initial address message of corresponding steps A 207).
It should be noted that if enhanced MSC and MSC merge to be provided with then above-mentioned steps A204, A206, A207, A214, A217 and A218 merge inner realization of network element device of setting at this.
So far, Dui Ying IMS session successfully switches to from the CS territory from the LTE/SAE network insertion and inserts.Comprise two switchings in this switching: one is exactly that steps A 208 switches to CS territory at operation layer from the IMS network with session, and another is exactly the step except steps A 208, is that the access with session switches to the network insertion from CS from the LTE/SAE network insertion.
More than describe the single wireless channel continuity switching method of general service, introduced the framework of IMS urgency traffic system below.
According to the mandatory provision of telecommunication management department, communication network must provide the emergency voice calls business.When the user dials the urgency traffic number, or the default urgency traffic number of storing in the use terminal equipment, or use urgency traffic to identify when initiating urgency traffic, network continues urgency traffic to the urgency communication of locality and accepts the center, as police office, fire alarm center, medical aid center, rescue center etc.
Fig. 3 is a system architecture diagram of realizing the IMS urgency traffic in the prior art, comprises following network element:
Subscriber equipment (UE) is used to initiate the urgency traffic session;
Agency-call session processing capacity entity (Proxy-CSCF, be called for short P-CSCF), the urgency traffic conversation request that is used for receiving be sent to promptly-and call session processing capacity entity handles;
The position obtains functional entity (Location Retrieval Function is called for short LRF), is used to obtain the positional information of the subscriber equipment of initiating the urgency traffic session;
Promptly-call session processing capacity entity (Emergency-CSCF, be called for short E-CSCF), be used to handle the urgency traffic conversation request that sends over from P-CSCF, and obtain user position information from LRF, the urgency traffic conversation request is directly delivered to the public security response center in IMS territory, perhaps deliver to the public security response center of circuit commutative field by fixed network etc.;
Service-call session processing capacity entity (Serving-CSCF is called for short S-CSCF) is used to handle from the calling of public security response center to subscriber equipment;
Public security response center (Public Safety Answering Point is called for short PSAP) is used for the urgent call of process user equipment, perhaps calling user device.
In addition, in conversation procedure, also relate to interconnection boundary Control functional entity (IBCF, InterconnectionBorder Control Function), query call conversation control function entity functional entity (not shown)s such as (I-CSCF, InterrogatingCall Session Control Function).
In the IMS urgency traffic, user's urgency traffic conversation request need be routed to the E-CSCF on visit ground, is matched by E-CSCF and LRF, the urgency traffic conversation request is routed directly to PSAP, or is routed to PSAP by E-CSCF by MGCF/MGW.
According to the characteristics of urgency traffic, require urgency traffic to realize in the visit territory, promptly the related network elements of urgency traffic all should be in the visit territory.
Realize that at the IMS network method of urgency traffic is in the prior art: user terminal is linked into E-CSCF by P-CSCF, and E-CSCF is linked into local emergency service center (PSAP) again, thereby realizes urgency traffic.
Realize that in the CS territory urgency traffic method is in the prior art: user terminal is directly initiated the MSC of emergent service call to the visit territory, and the MSC in visit territory is connected to corresponding PSAP according to user position information with this emergent service call.
Yet, realize that under existing SRVCC framework the single wireless channel voice business continuity switching of urgency traffic session has following defective:
(1) since existing SRVCC framework SCC AS down, obviously do not meet the related network elements of urgency traffic at home domain all should be in the requirement of visiting the territory;
(2) under existing SRVCC framework, because no card user terminal or unauthenticated user terminal need be used IMEI (International Mobile Equipment Identity, international mobile equipment identification number) makes a call, and the isup message in the steps A 208 can not carry IMEI, can't therefore can't realize the switching of urgency traffic session with IMEI as session association information.
Summary of the invention
Technical problem to be solved by this invention is, overcome the deficiencies in the prior art, the requirement of the local network that a kind of related network elements that meets the urgency traffic system is positioned at UE is provided and support no card user terminal or unauthenticated user terminal the urgency traffic system switched of the voice business continuity of urgency traffic session and changing method accordingly.
In order to address the above problem, the invention provides a kind of changing method of urgency traffic session, this method comprises:
After user equipment (UE) has been set up the urgency traffic session that anchors to urgent call switching server EHS by Long Term Evolution/System Architecture Evolution LTE/SAE network insertion and with public security response center PSAP, described urgency traffic session need be switched to when inserting from the circuit switching (CS) territory, Mobility Management Entity MME sends handoff request message to EHS, carries the emergent session related information of described urgency traffic session in this message;
After EHS receives described handoff request message, mutual with the target moving exchanging center MSC in CS territory, for CS territory bearing resource between EHS and the target MSC is set up in described urgency traffic session;
EHS finds the far-end session branch of described urgency traffic session according to described emergent session related information, with after described CS territory bearing resource links to each other, notice UE inserts from the global system for mobile communications Radio Access Network GERAN or the universal land radio access web UTRAN of the enhancing data rate in CS territory with it;
Wherein, described far-end session branch is the bearing resource of the described urgency traffic session of setting up before carrying out described switching between EHS and the PSAP; EHS is positioned at the local network of UE.
In addition, described emergent session related information is: character string in the phone common user sign of the comprehensive service digital net number of UE or UE before ' at ' symbol or the international mobile equipment identification number of UE.
In addition, carry the positional information of UE or the number of described target MSC in the described handoff request message that MME sends;
If the positional information of carrying UE in the described handoff request message, then EHS is according to described positional information and local selection of configuration MSC, and with selected MSC as described target MSC.
In addition, UE adopts following steps to insert from the GERAN or the UTRAN in CS territory:
A:UE sends switching access message to GERAN or UTRAN; After receiving this message, GERAN or UTRAN send change detection to message to target MSC;
B: target MSC receives change detection and send MAP MAP processing access signaling message to EHS after message;
C:UE sends handoff completion message to GERAN or UTRAN; After receiving this message, GERAN or UTRAN send handoff completion message to target MSC;
D: target MSC sends MAP transmission end signal message to EHS after receiving handoff completion message.
In addition, receive after MAP handles access signaling message, EHS deletes the bearing resource of the described urgency traffic session of setting up between itself and the UE before carrying out described switching.
In addition, receive after MAP sends end signal message, EHS deletes the bearing resource of the described urgency traffic session of setting up between itself and the UE before carrying out described switching.
The present invention also provides a kind of urgency traffic system, comprises:
The target MSC in the GERAN in the universal land radio access web E-UTRAN of the evolution of LTE/SAE network and MME, CS territory or UTRAN, CS territory, agency-call session processing capacity entity P-CSCF, urgent-call session processing capacity entity E-CSCF, PSAP; It is characterized in that this system also comprises EHS; Wherein:
Described MME is used for inserting from described E-UTRAN as UE, and after having set up the urgency traffic session that anchors to described EHS by described P-CSCF and E-CSCF and described PSAP, in the time of described urgency traffic session need being switched to from described GERAN or UTRAN access, send handoff request message to described EHS, carry the emergent session related information of described urgency traffic session in this message;
Described EHS is used for after receiving described handoff request message, and is mutual with described target MSC, for CS territory bearing resource between described EHS and the described target MSC is set up in described urgency traffic session; And find the far-end session branch of described urgency traffic session according to described emergent session related information, with after described CS territory bearing resource links to each other, notify described UE to insert it from described GERAN or UTRAN;
Wherein, described far-end session branch is the bearing resource of the described urgency traffic session of setting up before carrying out described switching between described EHS and the described PSAP; Described EHS is positioned at the local network of described UE.
In addition, described emergent session related information is: character string in the phone common user sign of the comprehensive service digital net number of UE or UE before ' at ' symbol or the international mobile equipment identification number of UE.
In addition, described GERAN or UTRAN also are used for receiving described UE for after inserting the switching that sends from described GERAN or UTRAN and inserting message, to described target MSC transmission change detection to message; And be used for behind the handoff completion message that receives described UE transmission, sending handoff completion message to described target MSC;
Described target MSC also is used for receiving described change detection after message, sends MAP to described EHS and handles access signaling message; And be used for after receiving described handoff completion message, send MAP to described EHS and send end signal message.
In addition, described EHS also is used for deleting the bearing resource of the described urgency traffic session of setting up between described EHS and the described UE before carrying out described switching after receiving described MAP processing access signaling message or described MAP transmission end signal message.
In sum, adopt said system of the present invention and method, the related network elements that has satisfied the urgency traffic system all should be arranged in the requirement of local network of UE and the urgency traffic session that has overcome no card user terminal of prior art or unauthenticated user terminal can't be carried out the problem that voice business continuity switches.
Description of drawings
Fig. 1 is a VCC solution structural representation of the prior art;
Fig. 2 is a principle Organization Chart of realizing the scheme of SRVCC in the prior art;
Fig. 2 A is under SRVCC framework shown in Figure 2, and session is switched to the method flow diagram that (promptly inserting from GERAN/UTRAN) inserted in the CS territory from LTE/SAE network insertion (promptly inserting from E-UTRAN);
Fig. 3 is a system architecture diagram of realizing the IMS urgency traffic in the prior art;
Fig. 4 is the structural representation of embodiment of the invention urgency traffic system;
Fig. 5 is a method flow diagram of setting up the IMS urgency traffic under urgency traffic of the present invention system;
To be embodiment of the invention UE realize under LTE/SAE inserts Fig. 6 that the single wireless channel continuity of urgency traffic session is switched, and the urgency traffic session is switched to method flow diagram with the CS territory of 2G/3G network.
Embodiment
Core concept of the present invention is, newly-increased function network element in the local network of UE: urgent call switching server (Emergency call Handover Server, be called for short EHS), to replace enhanced MSC of the prior art and the SCC AS that is positioned at the home network of UE.
If UE is positioned at visited network, above-mentioned local network is meant the visited network of UE, if UE is positioned at home network, above-mentioned local network is meant the home network of UE.
Describe the present invention below in conjunction with drawings and Examples.
Fig. 4 is the structural representation of embodiment of the invention urgency traffic system.Below in conjunction with Fig. 4 the function of the network element in this system is briefly described.
As shown in Figure 4, this system comprises: target MSC, P-CSCF, E-CSCF, PSAP and the EHS in the GERAN in the E-UTRAN of LTE/SAE network and MME, PDNGW/S-GW, CS territory or UTRAN, CS territory.Above-mentioned all network elements all are positioned at local network for UE.
The main difference part of urgency traffic system of the present invention and existing urgency traffic system is to have increased the EHS that is positioned at the UE local network newly.From the angle of IMS network, this network element is an AS (Application Server, an application server), and from the angle in CS territory, this network element is exactly a MSC.
Interface between EHS and the E-CSCF still adopts the ISC interface between the CSCF and application server in the prior art; In addition, also increased the enhancing Sv interface between EHS and the MME, this interface is supported in the message of switching between the different radio technology, promptly can handle the handoff request message of MME transmission and the switching response message of EHS loopback.
Increased the E interface between the MSC in EHS and CS territory in addition, this interface is consistent with interface function between the traditional MSC, is mainly used in processing from the handoff request message that EHS transmits, and sets up the circuit carrying between MSC and the EHS.
In addition, when UE set up the urgency traffic session by above-mentioned urgency traffic system, the urgency traffic session need be anchored into EHS.
Below in conjunction with accompanying drawing to setting up the urgency traffic session based on system shown in Figure 4, carrying out the method that the single wireless channel voice business continuity of urgency traffic session switches and be described in detail.
Fig. 5 is a method flow diagram of setting up the IMS urgency traffic under urgency traffic of the present invention system, comprises the steps:
501, UE sends session invitation message by the E-UTRAN and the PDN-GW/S-GW of LTE/SAE network to P-CSCF, carries urgent sign in this message;
502, P-CSCF selects corresponding E-CSCF according to user position information, transmits above-mentioned session invitation message to E-CSCF;
503, E-CSCF anchors to EHS according to triggering criterion with above-mentioned session invitation message;
Above-mentioned triggering criterion can be: judge whether this session is emergent session, if then it is anchored to EHS.
In other embodiments of the invention, E-CSCF also can not use triggering criterion, and all sessions that receive are all anchored to EHS.
In addition, in other embodiments of the invention, if EHS is a functional module that is arranged among the E-CSCF, above-mentioned grappling function is in the inner realization of E-CSCF.
504, E-CSCF sends session invitation message according to user profile to the PSAP of correspondence, carries urgent sign and user profile in this message;
If PSAP does not support the multimedia service of IMS, will transmit above-mentioned session invitation message by other media gateway.
505, PSAP is to E-CSCF loopback success response message;
506, E-CSCF sends to EHS with success response message, and EHS gives E-CSCF with this message loopback again;
507, E-CSCF transmits above-mentioned success response message to P-CSCF;
508, P-CSCF sends success response message by the LTE/SAE network to UE.
This moment, the session of IMS urgency traffic was set up successfully, this urgency traffic session comprises PS session Leg between that two session branch (session Leg): UE sets up by the LTE/SAE network and the EHS (being the bearing resource of this urgency traffic session of setting up between UE and the EHS), and the far-end session Leg between EHS and the PSAP (being the bearing resource of this urgency traffic session of setting up between EHS and the PSAP).
To be embodiment of the invention UE realize under LTE/SAE inserts Fig. 6 that the single wireless channel continuity of urgency traffic session is switched, and the urgency traffic session is switched to method flow diagram with the CS territory of 2G/3G network.In this flow process, UE sets up a urgency traffic session by the LTE/SAE network in the IMS territory, and this Session Anchor is to EHS.Switching flow shown in Figure 6 comprises following steps:
601, UE sends measurement report to E-UTRAN after receiving the measurement request that LTE/SAE wireless net member E-UTRAN sends, comprise adjacent district information in this measurement report;
602, E-UTRAN is according to the adjacent district information in the measurement report, and decision is initiated to switch, and therefore sends RELOCATION REQUEST message to MME;
603, MME judges according to the feature that the urgency traffic session is set up whether to be switched session is the urgency traffic session, if MME reexamines the whether local corresponding emergent session related information that stores, and if there is no then obtains the emergent session related information by E-UTRAN to the user;
In addition, MME can also check the local positional information that whether stores respective user, if there is no then obtains to the user by E-UTRAN.
For the authenticated user terminal, above-mentioned emergent session related information is: user's integrated services digital network (ISDN, Integrated Service Digital Network) number, or the number that obtains according to the phone common user of user terminal sign (tel URI) conversion (promptly getting ' at ' symbol (' @ ') character string before).
For unverified user terminal or there is not the card user terminal, above-mentioned emergent session related information then is the IMEI of user terminal.
Comprise tracking area identification (TAI) in the above-mentioned positional information, also may comprise the longitude and the latitude of user position.
604, MME sends RELOCATION REQUEST message forward according to configuration to EHS; Carry corresponding emergent session related information in this message;
MME can carry out following configuration: if the pairing session of the RELOCATION REQUEST message that receives (being the handoff request message that E-UTRAN sends) is the urgency traffic session, then send RELOCATION REQUEST message (being the handoff request message that MME sends) forward to the EHS of correspondence.
It should be noted that therefore above-mentioned emergent session related information can be IMEI because MME is not an isup message to the handoff request message (being above-mentioned RELOCATION REQUEST message forward) that EHS sends.
Can also carry the number or the user position information of target MSC in the above-mentioned RELOCATION REQUEST message forward according to the configuration of MME.In addition, can also carry the urgent call sign in the above-mentioned RELOCATION REQUEST message forward.
605, EHS sends MAP to target MSC and prepares handoff request message according to above-mentioned RELOCATION REQUEST message forward;
If do not carry the number of target MSC forward in the RELOCATION REQUEST message, EHS is according to the target MSC number of the selection of configuration correspondence of user position information and this locality.
606, MSC sends to switch to GERAN/UTRAN and requires request message, and GERAN/UTRAN returns to switch to MSC and requires acknowledgement message;
607, MSC returns MAP to EHS and prepares handover request ack message, carries Handover Number in this message, and this Handover Number is distributed by MSC;
608, EHS sets up the circuit commutative field bearing resource of urgency traffic session according to Handover Number and MSC;
The above-mentioned process of setting up the circuit commutative field carrying specifically comprises:
608a:EHS sends session invitation message to media gateway, and the routing number of this message is above-mentioned Handover Number;
608b: media gateway sends the ISUP initial address message to MSC, and the called number of this message is above-mentioned Handover Number;
608c:MSC is to the corresponding response message of EHS loopback.
So far, EHS and target MSC have been set up CS session Leg.
609, EHS is associated with the urgency traffic session that (promptly inquiring) switches according to the emergent session related information that carries in the above-mentioned RELOCATION REQUEST message forward (being ISDN number or the number or the IMEI that are converted to by tel URI), and upgrade the far-end session Leg of this emergent session, with CS session Leg with after far-end session Leg links to each other, to MME loopback relocation response message forward;
610, MME returns relocation response message to E-UTRAN;
611, E-UTRAN returns the reorientation command messages to UE;
612, receive the reorientation command messages after, UE is known and can be begun to insert from the CS territory, therefore sends to switch to target GERAN/UTRAN and inserts message;
613, after GERAN/UTRAN detects switching, send change detection to message to MSC;
614, MSC notifies the EHS user terminal to insert from the CS territory to the processing access signaling message that EHS sends MAP;
After receiving the processing access signaling message of MAP, EHS can delete corresponding PS session Leg.
615, UE sends handoff completion message to GERAN/UTRAN;
616, GERAN/UTRAN sends handoff completion message to MSC;
617, MSC sends MAP_SEND_END_SIGNAL message (MAP sends end signal) message to EHS, and this message is used to notify the EHS user terminal to switch to the CS territory;
If not deletion in the step 614 receives after MAP sends end signal message, EHS can delete corresponding PS session Leg.
618, MSC is to EHS return response message.
So far, user terminal is finished single wireless channel urgency traffic continuity and is switched, and successfully the urgency traffic session is inserted the CS territory that switches to the 2G/3G network from LTE/SAE and inserts.
Claims (8)
1. the changing method of a urgency traffic session is characterized in that, this method comprises:
After user equipment (UE) has been set up the urgency traffic session that anchors to urgent call switching server EHS by Long Term Evolution/System Architecture Evolution LTE/SAE network insertion and with public security response center PSAP, described urgency traffic session need be switched to when inserting from the circuit switching (CS) territory, Mobility Management Entity MME sends handoff request message to EHS, carry the emergent session related information of described urgency traffic session in this message, described emergent session related information comprises the character string before ' at ' symbol in the phone common user sign of UE, or the international mobile equipment identification number of UE;
After EHS receives described handoff request message, mutual with the target moving exchanging center MSC in CS territory, for CS territory bearing resource between EHS and the target MSC is set up in described urgency traffic session;
EHS finds the far-end session branch of described urgency traffic session according to described emergent session related information, with after described CS territory bearing resource links to each other, notice UE inserts from the global system for mobile communications Radio Access Network GERAN or the universal land radio access web UTRAN of the enhancing data rate in CS territory with it;
Wherein, described far-end session branch is the bearing resource of the described urgency traffic session of setting up before carrying out described switching between EHS and the PSAP; EHS is positioned at the local network of UE.
2. the method for claim 1 is characterized in that,
Carry the positional information of UE or the number of described target MSC in the described handoff request message that MME sends;
If the positional information of carrying UE in the described handoff request message, then EHS is according to described positional information and local selection of configuration MSC, and with selected MSC as described target MSC.
3. the method for claim 1 is characterized in that,
UE adopts following steps to insert from the GERAN or the UTRAN in CS territory:
A:UE sends switching access message to GERAN or UTRAN; After receiving this message, GERAN or UTRAN send change detection to message to target MSC;
B: target MSC receives change detection and send MAP MAP processing access signaling message to EHS after message;
C:UE sends handoff completion message to GERAN or UTRAN; After receiving this message, GERAN or UTRAN send handoff completion message to target MSC;
D: target MSC sends MAP transmission end signal message to EHS after receiving handoff completion message.
4. method as claimed in claim 3 is characterized in that,
Receive after MAP handles access signaling message, EHS deletes the bearing resource of the described urgency traffic session of setting up between itself and the UE before carrying out described switching.
5. method as claimed in claim 3 is characterized in that,
Receive after MAP sends end signal message, EHS deletes the bearing resource of the described urgency traffic session of setting up between itself and the UE before carrying out described switching.
6. urgency traffic system comprises:
The target MSC in the GERAN in the universal land radio access web E-UTRAN of the evolution of LTE/SAE network and MME, CS territory or UTRAN, CS territory, agency-call session processing capacity entity P-CSCF, urgent-call session processing capacity entity E-CSCF, public security response center PSAP; It is characterized in that this system also comprises urgent call switching server EHS; Wherein:
Described MME is used for inserting from described E-UTRAN as UE, and after having set up the urgency traffic session that anchors to described EHS by described P-CSCF and E-CSCF and described PSAP, in the time of described urgency traffic session need being switched to from described GERAN or UTRAN access, send handoff request message to described EHS, carry the emergent session related information of described urgency traffic session in this message, described emergent session related information comprises in the phone common user sign of UE character string before ' at ' symbol or the international mobile equipment identification number of UE;
Described EHS is used for after receiving described handoff request message, and is mutual with described target MSC, for CS territory bearing resource between described EHS and the described target MSC is set up in described urgency traffic session; And find the far-end session branch of described urgency traffic session according to described emergent session related information, with after described CS territory bearing resource links to each other, notify described UE to insert it from described GERAN or UTRAN;
Wherein, described far-end session branch is the bearing resource of the described urgency traffic session of setting up before carrying out described switching between described EHS and the described PSAP; Described EHS is positioned at the local network of described UE.
7. system as claimed in claim 6 is characterized in that,
Described GERAN or UTRAN also are used for receiving described UE for after inserting the switching that sends from described GERAN or UTRAN and inserting message, to described target MSC transmission change detection to message; And be used for behind the handoff completion message that receives described UE transmission, sending handoff completion message to described target MSC;
Described target MSC also is used for receiving described change detection after message, sends MAP to described EHS and handles access signaling message; And be used for after receiving described handoff completion message, send MAP to described EHS and send end signal message.
8. system as claimed in claim 7 is characterized in that,
Described EHS also is used for deleting the bearing resource of the described urgency traffic session of setting up between described EHS and the described UE before carrying out described switching after receiving described MAP processing access signaling message or described MAP transmission end signal message.
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| CN103052053B (en) | 2010-02-12 | 2016-03-02 | 华为技术有限公司 | Priority service processing method, device and system |
| CN102378250B (en) | 2010-08-23 | 2015-08-12 | 中兴通讯股份有限公司 | A kind of processing method of priority business and system |
| CN102457444B (en) * | 2010-10-22 | 2016-09-07 | 中兴通讯股份有限公司 | A kind of converging fixed network and the system and method for mobile network |
| EP2807809B1 (en) * | 2012-01-26 | 2018-12-26 | Telefonaktiebolaget LM Ericsson (publ) | Providing an ims voice session via a packet switch network and an emergency voice session via a circuit switch network |
| CN108541031B (en) * | 2017-03-03 | 2020-07-21 | 华为技术有限公司 | Service switching method, device and system |
| US11265771B2 (en) * | 2019-08-14 | 2022-03-01 | Mediatek Inc. | AT commands for supporting session and service continuity modes of 5G protocol data unitsession operations |
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