CN101395950A - System and method for supporting voice call continuity for VOIP emergency calls - Google Patents

Abstract

A system and method are disclosed to support Voice Call Continuity (VCC) for emergency calls. The system includes a VCC Application in a visited internet-protocol multimedia subsystem (IMS) to facilitate domain transfers between the IMS subsystem and a circuit-switched (CS) subsystem. The system further includes an emergency call session control function (E-CSCF) subsystem in the visited IMS subsystem that is operatively coupled to the VCC Application to facilitate domain transfers between the IMS subsystem and the CS subsystem.

Description

Be used to support the system and method for the voice call continuation of voice of the Internet protocol urgent call

The CROSS-REFERENCE TO RELATED APPLICATIONS case

Present application for patent is advocated the interests of following U.S. Provisional Patent Application case: the sequence number that the name that (1) Si Difenaizhi (StephenEdge) filed an application on April 28th, 2006 is called " being used for the support (SUPPORT OF VCC FOR VOIP EMERGENCY CALLS) of the VCC of VOIP urgent call " is the 60/795th, No. 774 a U.S. Provisional Application case; (2) Si Difenaizhi (Stephen Edge) name of filing an application on May 1st, 2006 sequence number that is called " being used for the support (SUPPORT OF VCC FOR VOIPEMERGENCY CALLS) of the VCC of VOIP urgent call " is the 60/796th, No. 669 a U.S. Provisional Application case; And the sequence number that the name that (3) Si Difenaizhi (Stephen Edge) filed an application on June 21st, 2006 is called " system and method (SYSTEM AND METHOD FOR SUPPORTINGVOICE CALL CONTINUITY FOR VOIP EMERGENCY CALLS) that is used to support the voice call continuation of VOIP urgent call " is the 60/815th, No. 738 U.S. Provisional Application case, it is assigned in the assignee of the present invention and therefore clearly is incorporated herein with way of reference.

Technical field

The present invention generally relates to a kind of system and method for supporting the voice call continuation (VCC) of IP-based speech (VoIP) urgent call effectively.

Background technology

Voice call continuation (VCC) is a kind ofly just to carry out standardized feature by third generation partner program (3GPP) and third generation partner program 2 (3GPP2).File 3GPP TS 23.206 (the voice call continuation between ＂ CS and the IMS that 3GPP can openly obtain; Stage 2 (Voice Call Continuity between CS and IMS; Stage

2) provided the definition of VCC ＂).The file 3GPP2 that 3GPP2 also can openly obtain equally

X.P0042-001-0 (voice call continuation-stage 2 (the Voice Call between ＂ IMS and the circuit switching system

Continuity between IMS and Circuit Switched Systems-Stage 2) provided the definition of VCC ＂).The definition of two VCC is all quite similar, and all supports the continuation of the voice call of (wireless or non-wireless) from wireless terminal to a certain other device when wireless terminal exchanges between the wireless access that VoIP is supported in the wireless access and the use of use supports current mode.In particular, use VCC can avoid (for example having to call release when the user exchanges when inserting, circuit-mode call) and (for example rebulid calling, use VoIP), this can cause significantly postponing and the user who is calling out being caused interference, and may cause rebuliding described calling.

The instantiation of the Radio Access Network of supports current mode is called as circuit switching (CS) territory sometimes, and it comprises global mobile communication (GSM), the Universal Mobile Telecommunications System (UMTS) that uses Wideband Code Division Multiple Access (WCDMA) (W-CDMA) and cdma2000 1X.Support the example of the Radio Access Network of VoIP to comprise UMTS W-CDMA, cdma20001xEV-DO (evolution data optimization) and various WLAN (WLAN) and WiMax network.In some cases, same access network (for example, UMTS W-CDMA) but supports current mode and VoIP both, but require user's wireless terminal only to use one of them (once any) for specific call.

When the wireless user loses the covering of specific wireless access network and need utilize another access network, ongoing calling can be handed over to another network from an access network sometimes and can break in service (if the access of described type (circuit-mode or VoIP) remains unchanged).Yet when the access of described type need change (for example, because new access network is not supported the previous access style that uses), it can discharge described calling usually and use new access style to rebulid described calling once more.VCC a kind ofly can carry out handover and the ability of this interruption can not occur between VoIP and circuit-mode.

At present, both have all defined VCC at common non-emergency call 3GPP and 3GPP2, and VCC may and support the urgent call that use circuit-mode or VoIP start ambiguously.This is because solution that 3GPP and 3GPP2 are defining at VCC among both and the solution that has defined and defined for supports current mode and VoIP urgent call and incompatible.This incompatible main cause is: support the solution of urgent call to depend on from current to the wireless user provides the support of the network (being called institute's accesses network) of service, and the solution of VCC needs VCC in the subscriber's local network to support when accesses network (even being different from).

The VCC that lacks urgent call supports to mean: if the wireless user need (or in same access network) change between use circuit-mode and use VoIP in different access networks, then will have to discharge this type of described calling of calling out and start again.For example, this is because of user's shift position or obstruction of current access network or suffers a certain other abnormal condition.This may be unfavorable in particular, because if user's originating call again, then described calling may not can be led to same public safety answering point (PSAP) operator (that is same individual) as before.In addition, if when calling is set up for the first time, do not provide callback number (for example, in original access network, not having under the situation of proper authorization), the then possibly described calling of can't starting again of PSAP operator at wireless terminal.Therefore, expansion VCC supports that the ability of urgent call is favourable.

Summary of the invention

As 3GPP TS 23.206 (the voice call continuation between ＂ CS and the IMS; Stage 2 (Voice CallContinuity between CS and IMS, Stage 2) ＂) described in, VCC mainly is supported in new IMS (IP Multimedia System) entity that is called VCC calling continuation controlled function (VCC CCCF), and it is also referred to as the VCC application program in 3GPP TS 23.206 subsequent editions or (in some particular environment) is called the territory forwarding function.Described in 3GPP2 draft X.P0042-001-0 ((the VoiceCall Continuity between IMS and Switched Systems-Stage 2) ＂ of the voice call continuation-stage 2 between ＂ IMS and the circuit switching system), VCC is supported that by VCC application server (VCC AS) described VCC application server is the entity that a kind of 3GPP of being similar to VCC uses.3GPP VCC application program and 3GPP2 VCC AS are all through defining the local network of calling out the wireless user to be arranged in.Among this definition and the 3GPP TS 23.167 urgent call is defined at VoIP IMS current solution and with 3GPP2 X.P0049-000-0 in the 3GPP2 solution (＂ all-IP emergency services ＂) that defined incompatible, wherein IMS VoIP urgent call support is confined to the network of being visited.Similarly, the IMS urgent call can not be supported VCC, unless unless define new VCC method or IMS urgent call route is passed through described local network at the network of being visited.

Method disclosed herein has been used previous replacement scheme, because the local network support of IMS urgent call can change the solution of the current VoIP of being used for urgent call significantly and can introduce some new problems simultaneously, for example, integrity problem, the support that the visit national regulation is required and possible latency issue.This solution based on local network equally can be incompatible from the IMS urgent call of unauthorized user (for example, not having between institute's accesses network and the local network therein under the situation of roaming agreement) with support.The local network solution equally can be incompatible with support CS urgent call, because also support these CS urgent calls in institute's accesses network.

Method disclosed herein can realize the VCC support of urgent call and have following ability:

For the urgent call of in IMS (VoIP) or CS territory, starting, support the transfer of IMS (VoIP) to circuit switching (CS) territory

For the urgent call of in IMS (VoIP) or CS territory, starting, support the transfer of CS to IMS (VoIP) territory

The wireless user equipment (UE) that support has been authorized

Support undelegated UE-wherein UE do not obtain using the mandate of non-emergency call access network

When being supported in local network and the UE in when roaming

After an access network VCC transfers to another access network, provide lasting location to support

The ability in PSAP wireless user's of the initial urgent call of acquisition when calling out initial sending and/or during calling afterwards geographical position (for example, accurate latitude and longitude) is supported to typically refer in the location.At present, in (for example) Europe and the two places, North America, the urgent call of lock-on circuit pattern has this ability, and can force the VoIP urgent call to have this ability soon.Continued support to the location means, is changing access style (for example, becoming circuit-mode from VoIP) afterwards, and PSAP still can obtain wireless user's location.

Consider hereinafter detailed description of the invention in conjunction with the accompanying drawings, others of the present invention, advantage and novel feature will become apparent.

Description of drawings

Fig. 1 graphic extension exemplary communications system 100, it can be supported some users and can implement some aspect and embodiment at least of the present invention;

Fig. 2 is the simplification functional block diagram of exemplary cdma communication system;

Fig. 3 is an exemplary communications system, and it is supported the HDR transmission and is applicable to the transmission of scheduling to a plurality of users;

The exemplary AT of Fig. 4 graphic extension;

The standard reference model of Fig. 5 A graphic extension 3GPP embodiment (as disclosing among the 3GPP TS 23.206);

Fig. 5 B graphic extension according to of the present invention through revising reference model, its be different from common VCC master pattern (such as among the 3GPP TS 23.206 announcement and as showing among Fig. 5 A);

Fig. 6 A and 6B show that respectively the reference model to model shown in Fig. 5 A and the 5B replenishes, but described replenishing is the angle of the service of defining from 3GPPTS 23.167.

A kind of exemplary calling of Fig. 7 graphic extension program that starts;

The exemplary solution that the VCC that starts in a kind of CS of being supported in of Fig. 8 graphic extension (circuit switching) territory calls out;

Fig. 9 A and 9B show exchange subscriber the plane exemplary model (such as among the 3GPP TS 23.206 announcement);

Figure 10 A and 10B graphic extension exchange subscriber according to the present invention the plane through revising model, its be different from described master pattern (as disclose among the 3GPP TS 23.206 and as showing among Fig. 9 A and the 9B);

The exemplary embodiment that shift in the territory of Figure 11 graphic extension from IMS to CS;

The exemplary alternate embodiment of IMS to CS shifted in Figure 12 graphic extension territory;

The exemplary embodiment of CS to IMS shifted in Figure 13 graphic extension territory; And

The exemplary replacement scheme that shift in the territory of Figure 14 graphic extension from CS to IMS.

Embodiment

I. wireless communication system

Thereby described exemplary embodiments adopts exhibition wireless communication system support frequently broadcast service.Wireless communication system through widespread deployment so that various types of communications, for example speech, data etc. to be provided.These systems can be based on code division multiple access (CDMA), time division multiple access (TDMA), OFDM (OFDMA), 3GPP LTE (Long Term Evolution) wireless access, 3GPP2UMB (super mobile broadband), WiMax or some other modulation technique.

A kind of system can be through design to support one or more standards, for example be called the standard that the association of " third generation affiliate engineering " (being called 3GPP herein) provides by name, and may be implemented in one group of file, wherein include file number: TS 23.206 (" the voice call continuation between CS and the IMS, the stage 2 (version 7) (Voice CallContinuity Between CS and IMS; Stage 2 (Release 7)) "), TS 23.167 (" IP Multimedia System (IMS) emergent session (version 7) (IP Multimedia Subsystem (IMS) Emergency Sessions (Release 7)) "), TS 24.008 (" mobile radio interface layer 3 standards; Core network protocol; Stage 3 (version 6) (Mobile Radio Interface Layer 3 Specification; Core Network Protocols; Stage 3 (Release 6)) " TS 23.271 (" explanation (version 7) (FunctionalStage 2 Description of Location Services (LCS) (Release 7)) of functional stages 2 of positioning service (LCS) ", TR 21.905 (" 3GPP controlled term list (Vocabulary for 3 GPP Specifications) ") and TS 23.002 (" network architecture (version 7) (Network Architecture (Release 7)) ")); The standard that association provided that name is called " third generation affiliate engineering 2 (3rd GenerationPartnership Project 2) " is referred to herein as 3GPP2, wherein include file number: X.P0042-001-0 (" the voice call continuation between IMS and the circuit switching system (Voice Call ContinuityBetween IMS and Circuit Switch Systems) "), X.P0049-000-0 (" all-IP emergency services (All-IPEmergency Services) ") and X.S0024 (" IP-based positioning service (IP-Based LocationServices) "); TIA/EIA/ATIS J-STD-036 (" the wireless 9-1-1 Phase of enhancing (Enhanced Wireless9-1-1 Phase II) "); And relevant IETF RFC file, wherein comprise IETF RFC 3261 (" SIP: SIP (SIP:Session Initiation Protocol) ") and IETF RFC 2327 (" SDP: Session Description Protocol (SDP:Session Description Protocol) ").Standard cited above and file clearly are incorporated herein with way of reference.

Fig. 1 is as the example of communication system 100, and described communication system can be supported some users and can implement some aspect and embodiment at least of the present invention.In Fig. 1, Ref. No. 102A is meant the sub-district to 102G, and Ref. No. 160A is meant Node B to 160G, and Ref. No. 106A is meant to 106J and accesses terminal or subscriber equipment (UE).Can use in various algorithms and the method any to come transmission in the dispatching patcher 100.System 100 provides communication for some sub-district 102A to 102G, and each in the described sub-district provides service by the Node B 160A of correspondence respectively to 160G.In described exemplary embodiments, some Node B 160 has a plurality of reception antennas and other node only has a reception antenna.Similarly, some Node B 160 has a plurality of transmit antennas, and other node has single transmission antenna.There is not restriction to transmit antenna and reception antenna combination.Therefore, Node B 160 can have a plurality of transmit antennas and single receive antenna, or has a plurality of reception antennas and single transmission antenna, or has single or multiple transmission and reception antenna simultaneously.

Terminal in the overlay area (or UE) 106 can be (that is, static) fixed or move.As shown in fig. 1, the various terminals (or UE) 106 that distributed in the whole system.In arbitrary set moment, each terminal (or UE) 106 is all with at least one and may more a plurality of Node B 160 communicate on down link and up link, and this depends on whether adopt soft handover or terminal (or UE) whether to receive a plurality of transmission from a plurality of Node B through design and operation with (simultaneously or in regular turn).Down link is meant the transmission of from the Node B to the terminal (or UE), and up link is meant the transmission from terminal (or UE) to Node B.In described exemplary embodiments, some terminal (or UE) 106 has a plurality of reception antennas and other terminal only has a reception antenna.In Fig. 1, Node B 160A arrives terminal (or UE) 106A and 106J with transfer of data on down link, and to terminal (or UE) 106B and 106J, Node B 160C arrives terminal (or UE) 106C etc. with transfer of data to Node B 160B with transfer of data.

Growing wireless data transmission demand and the service expansion that can provide via wireless communication technology have impelled and have developed some kinds of concrete data, services.A kind of this service is called high speed packet data (HRPD).A kind of exemplary HRPD service is provided in " EIA/TIA-IS856cdma2000 high speed packet data air interface specification (EIA/TIA-IS856 cdma2000 High Rate Packet DataAir Interface Specification) ", and it is called " HRPD standard ".The HRPD service is generally the covering of voice communication system, and it can be provided at the effective ways of transmits data packets in the wireless communication system.Along with transfer of data quantity and the number of transmissions increase, can become crucial resource for the finite bandwidth that wireless radio transmission is used.Therefore, need a kind of effective and just method of in dispatching communication system, transmitting with the use of optimization available bandwidth.In described exemplary embodiments, the illustrated system 100 of Fig. 1 is consistent with the wireless access type system with HRPD service.

Fig. 2 is the simplification functional block diagram of exemplary 3GPP W-CDMA communication system.As mentioned above, can use radio network controller (RNC) (as defining in the 3GPP environment) 130 that the interface between various Node B (defining as the 3GPP environment) 160B that is arranged in network 104 and is distributed in the geographic area is provided.For ease of explaining, only show a Node B 160.Usually, described geographic area carefully is divided into is called the some of sub-district 102 (being shown among Fig. 1) than the zonule.Each Node B 160 all is configured to provide service for all subscriber equipmenies (UE) 106 in its respective cell.In some high service application, sub-district 102 can be divided into some sectors, wherein each sector all has Node B 160 to serve described sector.In described exemplary embodiments, show among the figure that three UE 106A-C communicate by letter with Node B 160.Each UE 106A-C all can pass through one or more Node B 160 access networks 104 under the control of RNC 130, or communicates by letter with other UE 106.

Modern Communication System is through designing to allow a plurality of users to insert a common communications medium.Known many multiple access technologies in this technology, for example, time division multiple access (TDMA), frequency division multiple access (FDMA), space division multiple access, polarization division multiple access, code division multiple access (CDMA) and other similar multiple access technology.Described multiple access notion is a kind of method for channel allocation that allows a plurality of users to insert a common user communication link.According to concrete multiple access technology, described channel allocation can have various forms.For instance, in the FDMA system, usually total frequency spectrum is divided into some less subbands, and each user can obtain its oneself the subband that is used for the access communications link.Perhaps, as in the OFDMA version of (for example) FDMA, can allow each user to insert many different frequency channels.Perhaps, in tdma system, during the existing time slot of periodicity emphasis, each user can obtain entire spectrum.In cdma system, each user can obtain entire spectrum all the time, but can be by making of sign indicating number is used for distinguishing its transmission.

Graphic extension is supported the HRPD transmission and is suitable for being dispatched to the example of communication system of a plurality of users' transmission among Fig. 3.Hereinafter describe Fig. 3 in detail, wherein specifically, Node B 160 and RNC 130 are situated between with packet network interface 146 and connect.RNC 130 comprises channel scheduler 132 to implement the dispatching algorithm at the transmission in the system 120.Channel scheduler 132 is determined the length of service intervals based on the momentary rate (indicated as the drc signal that most recent receives) of the reception data that are associated with distant station, can be with transfer of data to any specific distant station during described service intervals.But described service intervals does not continue in time, but can take place once every n groove.According to an embodiment, the first of transmission package during the very first time first time slot, and postponing the place's transmission of the time subsequently second portion of 4 time slots.Equally, any subsequent section of described bag is all in a plurality of interior transmission of time slot with similar 4 time slots expansions (that is 4 time slots of each interval).According to an embodiment, receive the definite service intervals length L i that is associated with particular data queue of momentary rate of data Ri.

In addition, channel scheduler 132 is selected the particular data queue of transmission.Then, retrieve the data to be transmitted of the amounts of being associated and provide it to element in channel 168 from data queue 172 so that be transferred to the distant station that is associated with data queue 172.Such as hereinafter argumentation, channel scheduler 132 selects described formation so that data to be provided, in next service intervals, use comprise with described formation in the information of each weight that is associated transmit described data.Then, upgrade the weight that is associated with the formation of described transmission.

RNC 130 and packet network interface 146, PSTN (PSTN) 148 be situated between connect and communication system in all Node B (for the sake of simplicity, only showing a Node B 160 among Fig. 2 B).Communicating by letter between each distant station and other user who is connected to packet network interface 146 and PSTN 148 in the RNC 130 coordinating communication systems.PSTN 148 is situated between with the user by standard telephone network (not showing among Fig. 2 B) and connects.

RNC 130 contains many selector elements 136, but only shows a selector element among Fig. 2 B for the sake of simplicity.Each selector element 136 is all through assigning to control communicating by letter between one or more Node B and the distant station (not shown).If be not that set distant station is assigned selector element 136 as yet, then notification call processor controls 141 needs to notify from a phone call described distant station.Then, call control processor 141 instructs Node B 160 to notify from a phone call described distant station.

Data source 122 contains a certain amount of data that are passed to set distant station to be passed.Data source 122 is provided to packet network interface 146 with described data.Packet network interface 146 receives data and routes data to selector element 136.Then, selector element 136 with transfer of data to each Node B 160 of communicating by letter with target remote station.In described exemplary embodiments, each Node B 160 is all kept the storage data queue 172 that is passed to the data of distant station to be passed.

From data queue 172 data are transferred to element in channel 168 with the form of packet.In described exemplary embodiments, on forward link, ＂ packet ＂ be meant a certain amount of maximum be 1024 data and a certain amount of data that will in predetermined ＂ time slot ＂, be transferred to target remote station (for example～1.667msec).Element in channel 168 can be inserted control field for each packet.In described exemplary embodiments, element in channel 168 is carried out cyclic redundancy check (CRC), CRC, packet and control field coding and is inserted a group code tail bit.Packet, control field, CRC parity bit and sign indicating number tail bit constitute through the format bag.In described exemplary embodiments, element in channel 168 so that with described through the format packet encoder and to the symbol in the described encoded bag interlock (or rearrangement).In described exemplary embodiments, use fertile assorted (Walsh) sign indicating number to cover, and use short PNI and PNQ sign indicating number that it is expanded through staggered bag.Expanded data is provided to RF unit 170, and described RF carries out quadrature modulates, filtering and amplification to signal in the unit.By antenna forward link signals is wirelessly transmitted to forward link.

At distant station 106 places, receive forward link signals and it is routed to receiver by antenna.Described receiver carries out filtering, amplification, integration demodulation and quantization to described signal.To offer demodulator (DEMOD) through digitized signal, and use short PNI and PNQ sign indicating number at described demodulator place carrying out de-spread through digitized signal and using fertile assorted (Walsh) to cover and separate covering.To offer decoder through demodulating data, described decoder is carried out the reverse process of the signal processing function of finishing at Node B 160 places, specifically, and release of an interleave, decoding and CRC check function.To be provided to data through decoded data converges.

Fig. 4 graphic extension is according to the UE (in the 3GPP environment) of present application for patent or another embodiment of AT (in the 3GPP2 environment) 106, and wherein UE or AT 106 comprise transmission circuit system 264 (comprising PA 308), receiving circuit 408, throttling control 306, codec processing unit 258, processing unit 302, carrier Control unit 412 and memory 416.At least one group of throttling rule of the throttling rule of throttling control unit 306 embodiment such as above graphic extension.The throttling rule is provided for controlling means and the method that RL goes up through-put power.

In the following discussion, will mainly under 3GPP framework reference model background, the present invention be described.Yet, should be appreciated that by institute's information revealed, the person of ordinary skill in the field can easily revise to use and to implement each side of the present invention in the 3GPP2 network architecture or in other network architecture.

II. framework reference model

The 3GPP embodiment of Fig. 5 A Display Realization territory branching program (such as among the 3GPP TS 23.206 announcement) reference model.Generally, the territory branching program can be realized the speech continuation and can have the UE 516 of VCC ability and the voice conversation of keeping in the activity at 518 o'clock in use simultaneously between CS territory 500 and IP-based territory 510.Call out to be associated and to comprise all territory branching programs initial and that shift subsequently with the VCC subscriber and all carried out and controlled by territory forwarding function (DTF) in subscriber's local IMS network 510, described territory forwarding function forms the part of VCC application program 504 among Fig. 5 A.

As shown in Fig. 5 A, adopt static grappling technology so that session possesses the UE 516 of VCC ability and 518 VCC subscriber voice call is set up 3pcc (third party call control) function at the DTF place for using when setting up.Call described DTF as carry out a part that starts or stop initial filtering standard (iFC) at VCC subscriber S-CSCF 514 places.DTF will himself be inserted in the signaling paths that uses the VCC subscriber voice call that VCC UE 516 and 518 makes by adopting route 3pcc function.For the voice conversation that starts, DTF stops from user's access leg and sets up long-range branch road towards remote port; For stopping voice conversation, DTF stops from the long-range branch road of remote port and sets up access leg towards the user.Access leg and the call control signalling between the long-range branch road that DTF coordinates to be associated with VCC subscriber voice call subsequently exchange.

As shown in Fig. 5 A, when setting up access leg via CS territory 500 and IMS 510 respectively, 3pcc is present in DTF and sentences its purposes for territory branching program precondition of graphic extension.The 3pcc at Fig. 5 A graphic extension DTF place and for the purposes of territory branching program, thereby it only shows that and realize and carrying out the territory shifts relevant signaling and bearing assembly.

Fig. 5 B shows the exemplary reference model of 3GPP, and it is different from the standard 3GPP reference model (it is disclosed in 3GPP TS23.206 and is shown among Fig. 5 A) that is used for common VCC.Comprise with the reference model difference of the VCC that supports IMS (VoIP) urgent call among the 3GPP TS 23.206: use the VCC application program 572 in institute's accesses network rather than use local VCC application program (it is shown as the element 504 among Fig. 5 A), and use in institute's accesses network emergency call session controlled function (E-CSCF that defines among the 3GPP TS 23.167) 576 rather than in 3GPP TS 23.206 use serving CSCF (S-CSCF, it is shown as the element 514 among Fig. 5 A) in the local network.The network agent CSCF (P-CSCF) that is visited also is the part of model, but it is not shown among Fig. 5 B.Note, also the VCC application program 752 among Fig. 5 B can be called VCC and call out continuation controlled function (CCCF), VCC apps server (VCC AS) or territory forwarding function (DTF).

Fig. 6 A shows the reference model among Fig. 5 A additional, but described replenishing is the angle of the service of defining from 3GPP TS 23.167.Assembly comprises retrieval by window function (LRF) 610, subscriber equipment (UE) 620, proxy CSCF (P-CSCF) 630, urgent CSCF (E-CSCF) 640 and S-CSCF 650, defines among described assembly such as the 3GPP TS23.167 and operates.

Fig. 6 B comprises the reference model identical with Fig. 5 B, but its to be the viewpoint of the model of support IMS (VoIP) urgent call defined from 3GPP TS 23.167 show.In Fig. 6 B, and be different from the reference model that discloses (and being shown among Fig. 6 A) among the 3GPP TS 23.167, VCC application program 660 has the interface of the E-CSCF 640 in institute's accesses network and may have the interface of the P-CSCF 630 in institute's accesses network.As defining among the 3GPP TS23.206, described urgent call will be anchored in the VCC application program.In addition, the location is supported to be anchored among the LRF 610 in institute's accesses network, so that no matter how UE 620 changes its service network and service-domain, PSAP all can continue to obtain the renewal location estimation from LRF 610.LRF 610 can be called grappling LRF herein.

By replace VCC application program (as element 572) among Fig. 5 B and the VCC application program (as element 660) among Fig. 6 B with VCC AS, can obtain reference model applicable to 3GPP2.In following explanation applicable to 3GPP, should be appreciated that (unless otherwise noted), can use same explanation to define VCC support method, as long as some term and object are become the 3GPP2 environment from the 3GPP environment to the 3GPP2 urgent call.In particular, mentioned 3GPP VCC application entity can be replaced by 3GPP2 VCC AS.Also can replace some hereinafter mentioned other 3GPP object, for example, the alternative 3GP GMLC of 3GPP2 MPC (mobile location centre Chinese) (Gateway Mobile Location Center).

The negotiation that III.VCC supports

For common VCC, local network (for example, local S-CSCF) can be known the VCC ability of UE according to the ordering information that obtains from the local subscriber server of UE (HSS).The VCC that described UE may know local network supports and is used for VDN (E.164 speech domain forwarding number) and the VDI (speech domain shifts SIP URI) that shift in the territory or be equivalent to other number and the address of VDN and VDI, thus when starting voice call for the first time can without any clearly consult and the situation of information transfer under realize VCC.

Though expect to support the VCC of CS and VoIP urgent call, may need some clear and definite signaling to change in same mode.For example, if difficulty of VCC is then supported in the negotiation supported without any VCC.This is because when UE changes the territory, and it can't learn that under the roaming situation old territory and neofield whether can cooperation support VCC, and so its can't learn whether existing calling can continue.In the following discussion, suppose that the VCC that provides in institute's accesses network the IMS urgent call supports.

III.A passes on UE to possess the method for VCC ability

For passing on described UE to possess the VCC ability, there is following possible replacement scheme to institute's accesses network (eg, P-CSCF, E-CSCF or speech move and serve switching center (VMSC)).

(a) if institute's accesses network is local network for UE, then it can find the VCC ability of UE from the ordering information of the UE the local HSS.

(b) institute's accesses network can suppose that UE possesses VCC ability (no matter whether described UE really possesses).For example, if institute's accesses network therefore be not local network and can not adopt replacement scheme (a), can suppose that then UE possesses the VCC ability.

(c) institute's accesses network (for example, P-CSCF or VMSC) can to local network period of registration (for example) from S-CSCF in response to the 200OK of SIP (SIP) registration message (it is defined in the IETF RFC 3261) response or in the UE ordering information that is provided to VMSC by HLR/HSS, find the VCC ability of UE.

(d) a kind of in can be as follows of described UE notifies its VCC ability to institute's accesses network (for example, P-CSCF or E-CSCF):

I. at period of registration (for example, in the SIP registration message); Or

Ii. when starting the IMS urgent call (for example, in the SIP message request); Or

Iii. when starting the urgent call of CS pattern (that for example, defines in 3GPP TS 24.008 promptly sets up in the information).

Replacement scheme (a) is applicable to the urgent call of starting in PS (packet switch) territory, if and UE roams (promptly, by its local network services), then can use mechanism identical to find the VCC ability with being used for common VCC support (being used for non-emergency call) described in the 3GPP TS 23.206.

For replacement scheme (b), the accesses network supposition UE of institute possesses the VCC ability and assign VCC resource (for example, as describing after a while) when starting urgent call in chapters and sections IV and Fig. 7.Yet,, can use described VCC resource if in fact UE possesses the VCC ability and urgent call need be carried out transition between IMS (VoIP) and circuit commutative field.Therefore, though urgent call itself and need not to suffer damage (because VCC resource only be used for the junction call signaling) can cause some wastes of the VCC resource of UE.For the urgent call of starting in the PS territory, waste may be less, because the quantity of this type of calling is generally the very little part of all voip calls (promptly reach non-emergent both).In addition, if combination replacement scheme (a) and replacement scheme (b) are so that institute's accesses network only just possesses the VCC ability of UE, the then degree that can further cut the waste under it is not the situation of local network.Yet for the urgent call that CS starts, the degree of waste may be higher, because most of CS urgent call is at least in that rise at the beginning will be from the UE that leaves over that can't support VCC.

Both all can avoid influence to UE replacement scheme (a) and replacement scheme (b), and this is for realizing that it is desirable being used for promptly reaching both common VCC solutions (from the angle of UE) of non-emergency call.

Replacement scheme (c) also can be avoided the influence to UE.Yet replacement scheme (c) may only be confined to authorized UE.

Replacement scheme (d.i) can be avoided the influence to local network, but equally only is confined to authorized UE, and replacement scheme (d.ii) and (d.iii) all effective for all UE, but it needs new VCC version from the angle of UE.

III.B passes on institute's accesses network to possess the method for VCC ability

For passing on institute's accesses network to possess the VCC ability and shift VDN and VDI (if desired), can there be following replacement scheme to UE.

(e) UE can from system broadcast message or other character is fixed and be not any UE proprietary message (for example, the WLAN advertisement that is associated with specific institute accesses network) find the VCC ability (and may find any VDN and VDI) of institute's accesses network.These message can be current from the all-network base station and/or access point be transferred to all UE so that the identical message of the network information (for example, network identity and tenability) to be provided.

(f) UE can use DHCP or use VCC ability and VDN and the VDI (if desired) that finds institute's accesses network from the hypertext transfer protocol (HTTP) or the secure HTTP (HTTPS) of the server in institute's accesses network (its role provides the information (for example, wherein also comprising the local emergency number) of crying of calling on urgently of fastening).

(g) institute's accesses network can be indicated its VCC ability to UE in following situation:

I. in period of registration (for example, in SIP 200OK message); Or

Ii. when answer IMS urgent call is started (for example, in SIP 200OK message); Or

Iii. when answering the request of PS pattern subordinate (for example, the network characterization support parameter among the use 3GPP TS 24.008); Or

Iv. answering CS urgent call when starting (for example, in 3GPP TS 24.008, defining in the facility parameter in the connection message).

(h) described local network can will arrive UE about the known download of information of the network of urgent call VCC of can supporting, or downloads to the Universal Integrated Circuit Card (UICC) among the UE.For example, local network can be UE provides all to possess the Mobile Country Code MCC (MCC) and the Mobile Network Code (MNC) of VCC ability.The for example VDN of this type of network use and the extraneous information of VDI also can be provided.

Replacement scheme (e) is applicable to wireless network (for example, UMTS, GPRS and GSM network) and also can be used for WLAN.It can avoid any point-to-point signaling influence to UE.Replacement scheme (f) can be avoided the SIP influence and can satisfy the needs that a certain server of local emergency number from institute's accesses network are provided to UE applicable to the IMS originating call.The address of this server can by UE use to the DHCP that contains a certain known fully qualified domain name (FQDN) of the known domain name of the network of visit to some extent or DNS inquiry (for example, MCC and the MNC based on institute's accesses network inquires about) and to a certain fixed-line subscriber name (for example ＂ urgent-support＜institute's access network domain ＂) DHCP or DNS inquire about and obtain.As a kind of modification, VCC ability (and (if desired) VDN and VDI address) can be when UE uses DHCP to find P-CSCF and dns server address direct signaling.

Replacement scheme (g.i) may be only for through authorizing UE effective, and replacement scheme (g.ii), (g.iii) and (g.iv) for through authorizing and UE is all effective without permission.

Replacement scheme (h) can for all UE all effectively and can use each local network exclusive signaling.

The required signaling of III.C changes

Need be used to support replacement scheme (c), (d) and SIP signaling (g) to change (above described in chapters and sections III.A and the III.B) can support by four kinds of different modes at least.

(i) use existing SIP header field (for example, reading control route, route, contact) to shift new signaling.

(j) expand the SIP header field of supporting among SIP registration, SIP invitation and the SIP 200OK by the new option label of creating indication VCC support.For shifting extra VCC information (for example, VDN and VDI), the new SIP expansion that is associated with the VCC option-tag of described support will be used.

(k) by define that new IANA registration or unregistered attribute expand that SIP invites and SIP 200OK in Session Description Protocol (SDP that defines among the IETF RFC 2327) part.For example, can use new character attribute to indicate VCC to support, and can assign one or two different value attribute to pass on VDN and VDI (for example, from E-CSCF or VCC application program) to UE.Other attribute of media-level (rather than attribute of session-level) may be suitable for defining selectively the specific medium (for example, audio frequency) of supporting VCC more.

(1) can use replacement scheme (i), (j) and (k) in both or both above combinations, for example, can only use the option-tag of support new in (j) to pass on SIP ability, and new SDP level value attribute is passed on any further VCC information (for example, VDN and VDI) in the use (k).

An example of scheme (j) as an alternative, UE can be included in interior and its support to VCC of indication in the SIP registration message by the SIP header field (it contains the new option-tag that indication VCC supports) that will support.If institute's accesses network is supported VCC and VDN and VDI (if desired) in new SIP expansion, then the 200OK that is returned by the accesses network P-CSCF of institute can comprise identical option-tag.As another example, during the call setup in SIP invitation and 200OK identical exchange can take place.Described same instance can be applicable to replacement scheme (k) and (1), but wherein uses new SDP attribute to pass on the information of VCC indication and/or relevant VCC.

For avoiding SIP and other point-to-point signaling to impact between the UE on the interface and the institute's accesses network, can use replacement scheme (a) and (b), (c), (e), (f) and a certain combination (h) aloft.Yet, allow SIP and CS domain signaling that UE is exerted an influence and can avoid the influence of local network and can support the VCC of unwarranted UE, for example, use (d.ii), (d.iii), (g.ii), (g.iii) and (g.iv).

The IV.IMS urgent call is started

Urgent call is started and can be carried out but need some change is made in the negotiation use of VCC as defining among the 3GPP TS 23.167.In particular, be after shift in arbitrary territory, to preserve the continuation supported the location and the continuation of voice call, E-CSCF in institute's accesses network or P-CSCF need call LRF with obtain or the checking location and the PSAP that selects your destination before SIP invitation (for the IMS urgent call) is sent to the VCC application program.Then, described VCC application program is with the described incoming call branch road of grappling and by the E-CSCF new call leg that spreads out of towards PSAP that starts.Therefore, spreading out of on the call leg from VCC application call E-CSCF.When accepting SIP invitation from the VCC application program, E-CSCF will define as TS 23.167 and carry out common location and route, and transfer the call to PSAP via IP or by MGCF (MGCF) and public switched telephone network (PSTN).It is essential carrying out as the location and the route that spread out of the part of call leg according to the VCC application program, so that remain unchanged whole the duration calling out with the contact of grappling retrieval by window function (LRF).With grappling LRF continue to get in touch continuation with realizing that the location is supported.In particular, when last call release, regardless of the number of times that shift in previous territory, E-CSCF will still be on the call signaling path, therefore and can notify LRF to call out and be released, and can make LRF thus according to requiring the call release record among the 3GPP TS 23.167.

The next exemplary calling of Fig. 7 graphic extension program that starts, and comprise (as possible option) above at wherein several replacement schemes of consulting to use VCC and shifting the replacement scheme of any VCC relevant information.

Step 1 (initial urgent call).In this step, the initial urgent call of user.

Step 2 (registration).Subscriber equipment (UE) 710 can be carried out the Emmergency log-on program with accesses network P-CSCF of institute 720 described in the 3GPP TS 23.167 and local network S-CSCF (not shown) under it contains the situation of documentary.The SIP 200OK message that SIP registration message or the local S-CSCF that UE 710 is sent returned can possess the VCC ability to the accesses network P-CSCF of institute 720 indication UE 710.The 200OK that turns back to UE 710 by the accesses network P-CSCF of institute 720 also can indicate institute's accesses network to possess the VCC ability and can provide VDN and VDI (if desired).

Step 3 (is invited (urgent, VCC)).The invitation that subscriber equipment (UE) 710 will have urgent indication sends to the accesses network P-CSCF of institute 720.Described invitation can contain any anchored object that UE 710 is had.Described anchored object depends on the access network technology.Described invitation also can be indicated the support (if this in step 2 to institute accesses network do not pass on) of UE to VCC, and also can contain the identifying information of UE, for example, and SIP and phone callback address or number.

Step 4a, 4b and 4c.Based on any indication of supporting about VCC in inviting or the VCC that knows in the step 2 to be obtained supports or according to scheme (a) and/or (b) (above be described among the chapters and sections III.A) and know or suppose the VCC support, P-CSCF 720 can two kinds of different modes transmit described invitation.

I. step 4a (invites (urgent, VCC)).P-CSCF invites the indication of supporting with possibility VCC to be forwarded to E-CSCF 740 SIP.And (invite in (urgent, VCC)), based on the indication of supporting about VCC among the step 4a or owing to the network policy (for example, supposing that all UE all support VCC), E-CSCF 740 invites SIP and is transmitted to VCC application program 760 at step 4b; Or

Ii. step 4c (invites (urgent, VCC)).Another is chosen as, and P-CSCF invites SIP and directly is transmitted to the VCC application program.Step 5 (inviting (promptly)).The described incoming call branch road of VCC application program 760 grapplings also starts and spreads out of branch road by described invitation being sent to (or being sent back to) E-CSCF 740.Described invitation can still carry urgent indication but no longer indicate support to VCC.

Step 6 (retrieval location).E-CSCF 740 as among the 3GPP TS 23.167 the urgent call that is defined as set up to carry out common processing.If the anchored object that provides in the described invitation is not enough to determine that if correct PSAP or IMS core needs route to determine the assistance of function (RDF), or the IMS core is verified anchored object if desired, then will retrieve Location Request and send to LRF 730 to carry out the retrieval by window function.Described retrieval Location Request can comprise the information (for example, MSISDN, IMSI and/or IMEI) of identification UE 710 and IP connectivity access network (IP-CAN), and can comprise the means (for example, UE IP address) that insert UE.The retrieval positioning requirements also can be included in any anchored object that is provided in the step 3 in the invitation.Described search address request can further comprise about the indication of VCC support and the identifying information (for example, VDN and VDI) of VCC application program 760.Yet, need among program C that this only describes in chapters and sections VI.B.1 and VI.B.2 after a while and the D.

Step 7 (obtaining location temporarily).LRF 730 can obtain interim location estimation.The means that obtain interim location estimation depend on UE7 10 and are using inserting the access technology of IMS, and can comprise secure user plane location (SUPL) program that is defined among the PS-NI-LR that defined among the 3GPP TS 23.271 or PS-MT-LR or the OMA AD SUPL of using: ＂ secure user plane positioning architecture ＂, OMA TS ULP: ＂ user plane location protocol ＂ or other program.LRF 730 can call route and determine that function (RDF) converts the address of PSAP to any anchored object that will locate or be received temporarily in step 6.LRF can be recorded in the information that receives in the step 6.

Step 8 (restoring to normal position).Locating information and/or PSAP address (obtaining in the step 7) are turned back to E-CSCF740.LRF 730 also can return identification himself and in step 7 storage any record correlation information (for example, ESQK).Remainder for calling out serves as grappling LRF by LRF 730.

Step 9a, 9b and 9c.Based on the locating information that provides in the step 8, E-CSCF 740 the PSAP address that provides in the steps 8 is provided or selects urgent center maybe may select PSAP self, and the request that will comprise locating information and any correlation information sends to urgent center or PSAP 780.

Step 9a (inviting (promptly)).Invitation is sent to MGCF/MGW (MGCF/medium net

Close) 770; And in step 9b (IAM), continue SS7 ISUP IAM to urgent center or PSAP; Or

Step 9c (inviting (promptly)) directly sends to invitation urgent center or PSAP 780.

Step 10a, 10b and 10c.May be used to set up the middle signaling (for example, returning SS7 ISUP ACM) of calling, not show among the figure from the PSTN that possesses the PSAP ability.When PSAP answered described calling, following steps can take place:

Step 10a (ANM).PSAP 780 turns back to MGCF/MGW 770 with SS7 ISUP ANM; And

Among the step 10b (200OK), MGCF/MGW turns back to E-CSCF with 200OK; Or

Step 10c (200OK).PSAP 780 directly turns back to E-CSCF 760 with 200OK.

Step 11 (200OK).E-CSCF 740 turns back to VCC application program (beginning spreads out of on the call leg in step 5) 760 with 200OK.

Step 12 (200OK).If once used step 4c previously, then VCC application program 760 can turn back to 200OK E-CSCF (on incoming call branch road that uses) 740 or P-CSCF 720 (not showing among Fig. 7) in step 4.If in step 2 or before step 2, UE 710 does not find that institute's accesses network to the support of VCC and any VCC information that is associated (for example, VDN, VDI), then the 200OK that returned of VCC application program 760 can indicate the support of VCC and can comprise VDN and/or VDI.

Step 13 (200 OK).E-CSCF 740 or P-CSCF 720 turn back to UE 710 (for example, if from E-CSCF then return via P-CSCF 720) with 200OK.For reducing influence to VCC application program 760, E-CSCF 740 or P-CSCF 720 and be not that VCC application program 760 in the step 12 can be arranged on any VCC indication and VDN/VDI among the 200OK.Then, UE 710 stores any VDN and/or the VDI that is received.

Set up after the urgent call between UE 710 in Fig. 7 and the urgent center 780, urgent center can use the program that has been defined among 3GPP TS 23.167 and the TS 23.271 to ask more accurate localization from LRF 730.

The V.CS urgent call is started

Graphic extension is supported in the exemplary solution of the VCC calling of starting in CS (circuit switching) territory among Fig. 8.As mentioned below, in this case, spreading out of on the call leg from VCC application call E-CSCF, and in addition, MSC can use existing GMLC MAP inquiry so that the incoming call branch road correctly is routed to the VCC application program to the incoming call branch road of VCC application program.In this example, GMLC uses IP Multimedia Routing Number (IMRN) that the incoming call branch road is routed to the VCC application program.As shown in hereinafter, the use of GMLC inquiry and IMRN can be partially or even wholly transparent for MSC.

Step 1 (initial urgent call).In this step, the initial urgent call of user.

Step 2 (urgent foundation).UE810 sends to VMSC 830 (as defining among the 3GPP TS24.008) the urgent voice call that starts by will promptly setting up message in the CS territory.The described message of setting up can indicate UE to support VCC.

Step 3 (finder).VMSC830 can be in RAN initial orders to obtain interim location estimation about UE 810 as defining and allow among the 3GPP TS 23.271.

Step 4 (MAP subscriber positioning reporting).Based on local VMSC 830 policies or based on the ordering information that obtains from the local HLR/HSS of UE or based on any VCC indication that step 2, receives, VMSC 830 sends to MAP subscriber positioning reporting the GMLC 850 that is associated with emergency services provider (PSAP), for example, based on Serving cell ID and the emergency numbers dialed, call out and to be sent to emergency services provider (PSAP) usually.MAP subscriber positioning reporting carries IMSI, MSISDN, IMEI, VMSC address and Serving cell identity or the SAI of UE.It also is included in any interim location estimation that obtains in the step 3.Usually determine that by VMSC 830 rather than GMLC 850 described message can carry the address of set destination PSAP in the area (for example, European Union) of PSAP therein.If MS provides the indication of supporting about VCC in step 2, then MAP subscriber positioning reporting also can carry this indication.

Step 5 (affirmation of MAP subscriber positioning reporting).GMLC 850 supposition UE 810 support VCC, or determine that from ordering information UE supports VCC (if UE 810 is by local network services), or any VCC that GMLC 850 is provided from step 4 indicates to determine that UE supports VCC.The call record of GMLC 850 storage UE 810 wherein comprises all information that receive in the step 4.GMLC 850 is that IP Multimedia Routing Number (IMRN) is assigned in described calling.Described IMRN can be an E.164 ISDN/ telephone number of international ITU, the combination of national ISDN/ telephone number or a certain other number or number or parameter (for example, being made up of a ten's digit sequence or several ten's digit sequence).Described IMRN also can be described as other title, for example, is called routing number.Minimally, IMRN realize being routed to the calling and the identification GMLC of VCC application program 870 in step 6 and 7.Optionally, IMRN also can temporarily discern the call record that is stored among the GMLC and/maybe can indicate PSAP.GMLC confirms to turn back to VMSC 830 with MAP subscriber positioning reporting, and described MAP subscriber positioning reporting confirms to carry the IMRN that is NA-ESRD or NA-ESRK parameter or is a certain other parameter or a certain other parameter group.The accurate location estimation of the also available VMSC8 30 excitation CS-MT-LR (not showing among Fig. 4) of GMLC 850 to obtain the being used for interim location estimation of route or to obtain to offer subsequently PSAP.VI further describes as chapters and sections, if obtain interim location estimation in this step rather than in step 3, then can reuse the program of Fig. 8 and support IMS to shift to the territory of CS.

Step 6 (IAM).VMSC 830 comes route to call out based on the IMRN that receives in the step 5.If use existing NA-ESRK or NA-ESRD parameter to pass on IMRN, then the calling routing program among the VMSC 830 can be identical with the employed calling routing program that starts of common urgent call among the 3GPPTS 23.271.Based on the IMRN route, VMSC830 routes the call to the MGCF 840 in institute's accesses network.

Step 7 (inviting (MRN)).To the initial invitation of I-CSCF (among Fig. 8 show), or MGCF 840 may be routed directly to E-CSCF 860, S-CSCF (showing among Fig. 8) or VCC application program 870 to MGCF 840 in the IMS that is visited.Described invitation comprises the identity MSISDN Tel URI of contact address (for example, as) of UE 810.Described I-CSCF or S-CSCF (not shown) or E-CSCF 860 will be activated to VCC application program 870 based on the apps server terminal of PSI based on IMRN.

Step 8 (invitation).VCC application program 870 grappling incoming call branch roads also start and spread out of branch road by invitation being sent to (or sending back to) E-CSCF 860.Described invitation (for example, inviting in the TO header at SIP) carries identified emergency and calls out and enable the information that IMRN recovers (for example, can comprise the unique number among the IMRN and can get rid of known stationary digital).Need not with locating information (for example, pidf-lo) be included in.

Step 9 (retrieval location).For example, based on comprising IMRN information in the step 8, E-CSCF 860 can send to the LRF 850 that is discerned or be associated with it by IMRN with the retrieval Location Request.Described retrieval Location Request comprises IMRN information and any UE identification (for example, MSISDN Tel URI) that receives in the step 8.Described retrieval Location Request can further comprise about the indication of VCC support and the identifying information (for example, VDN and VDI) of VCC application program.Yet this only needs among the program C described in chapters and sections VI.B.1 and VI.B.2 after a while and the D.

Step 10 (restoring to normal position).(for example, MSISDN) and/or based on IMRN information, LRF 850 also retrieves GMLC 850 institute's stored calls record in step 5 with GMLC 850 reciprocations based on any UE identification that receives in step 9.By any interim location (in case this finishes) of using existing any interim locating information in the described call record or obtaining according to step 5 or the identity of set PSAP destination, LRF 850 is with the PSAP address and locating information may be turned back to E-CSCF 860.If LRF is different with GMLC, then LRF will provide the anchor point of further support location, and reproduciblely obtain and storage receives the call record of the information of (the step 9) from E-CSCF from GMLC.LRF can (for example, ESQK) turn back to correlation information E-CSCF 860, thereby discern himself and described call record.LRF can be further with the GMLC reciprocation with VMSC 830 excitation CS-MT-LR programs (as in 3GPP TS 23.271, being defined) with the accurate location estimation of acquisition to UE.The connection (for example, the part of same entity) if if the IMRN that is provided by GMLC 850 in the step 5 indication PSAP and LRF and GMLC are closely related, then not execution in step 9 and 10 and E-CSCF can use IMRN to obtain the PSAP address.

Step 11 (invitation).E-CSCF 860 uses the PSAP address that obtains in the steps 10, and the call request that will comprise any locating information and any correlation information (for example, ESQK or IMRN) is transferred to urgent center or PSAP.Can call request be sent in the PSTN (not shown) via MGCF/MGW 840, or can be directly it be invited as SIP and send to urgent center or PSAP with IP ability.

Step 12 (setting up the remainder of CS urgent call).The remainder of described call setup procedure starts program based on the VCC CS that describes among the 3GPPTS 23.206 and betides between UE 810, VMSC 830, MGCF 840, VCC application program 870, E-CSCF 860 and the PSAP.

In the step 2 of Fig. 8, promptly set up and to comprise any VCC indication in the emergency class parameter in the message (it is defined among the 3GPP TS 24.008) as new service type (thereby because 3 spare biies of current existence can allow to define nearly 3 new service types).This has operability during the residue life expectancy of CS pattern, do not expect any new emergency class.

Set up after the urgent call between UE 810 among Fig. 8 and the PSAP, PSAP can use the program that has defined among 3GPP TS 23.167 and the TS 23.271 to ask accurate localization more from LRF 850.In particular, PSAP can use any correlation information (for example, ESQK or IMRN) that receives from E-CSCF 860 in the step 11 of Fig. 8 to discern LRF 850.If step 9 and 10 is not carried out, then LRF 850 will need as described at the step 10 among Fig. 8 with GMLC 850 reciprocations so that retrieval builds on the UE record among the GMLC 850 in Fig. 8 step 5.

For example, above program can use sub-district ID or interim location estimation to preserve having the support of PSAP route option now, may not need MSC is produced any new influence, and the mode among 3GPP TS 23.167 and the TS 23.271 of can being defined in is at present supported the accurate retrieval by window of PSAP.Its urgent call that also CS can be started sends to the PSAP with IP ability.

Under the situation of 3GPP2, Fig. 8 also is suitable for describing the CS urgent call and starts except following aspect: except replacing the VCC application program with 3GPP2 simulation entity, can also simulate 3GPP2 message and come the 3GPP MAP message shown in step of replacing 4 and 5.In this case, the 3GPP2 message in the step 4 and 5 will be respectively 3GPP2MAP origination request and the affirmation of MAP origination request; MSISDN in the step 4 will be replaced by mobile identification number (MIN), or the mobile directory number, MDN among Fig. 8 (MDN) and GMLC will be replaced by 3GPP2 mobile positioning center (MPC).

VI. shift in the territory

The territory is shifted and can be taken place to the very similar mode of the mode that is used for common VCC (defining as 3GPP TS 23.206).Fig. 9 A and 9B be based on the diagram among the 3GPP TS 23.206, the exchange on its explicit user plane.VCC for the IMS urgent call supports that the S-CSCF 910 that shows among Fig. 9 A and the 9B will be by figure E-CSCF 1050 (in institute's accesses network; Be shown among Figure 10 A and the 10B) replace, and UE#B 920 and 930 (as showing respectively among Fig. 9 A and the 9B) will be corresponding to PSAP 1060 (being shown among Figure 10 A and the 10B).

IMS is shifted to CS in the VI.A territory

Can support the territory of IMS urgent call to shift for shifting out when IMS covers and enter in the CS covering, will describe two kinds of optional procedures herein from the IMS territory to the CS territory at UE.Among the program A that in these chapters and sections, describes, the UE that possesses the VCC ability shows as common VCC (being described among the 3GPP TS 23.206), and use the VDN that obtains from institute's accesses network or local network and use replacement scheme (e) described in the above chapters and sections III.B, (f), (g) or (h) any one in the CS territory to the VCC application program new call leg that starts.

IMS is shifted to CS-program A in the VI.A.1 territory

In one embodiment, so that the UE 1110 that registers in new institute's accesses network of supporting the CS territory, and program A is restricted to supporting further to provide the continuation of UE positioned update to have to PSAP applicable to having abundant voucher for program A.Yet described program has the following advantages: from the angle of UE, the IMS of described program and common VCC shifts compatible to the CS territory.The exemplary embodiment of Figure 11 graphic extension program A.

Step 1 (is set up (VDN).If the user is not subordinated to the CS territory when UE need to determine the territory to transfer to CS, then UE can carry out the CS subordinate, wherein comprises the positioned update to its HLR/HSS.It uses previous VDN from original institute's accesses network or local network acquisition to start voice call to set up access leg via described CS territory the CS territory subsequently.At this program, can suppose that described UE can be discerned in the CS territory.

Step 2 (CS start program).In the CS network, originating call as described in as common CS calling is started, handling.

Step 3 (IAM (VDN)).(VMSC) 1130 of the mobile switching centre that is visited routes the call to the original IMS network of visiting via the MGCF 1140 in described original institute's accesses network.

Step 4 (is invited (VCC application program).MGCF 1140 visits among the IMS to inquiry CSCF (I-CSCF original; Do not show among Figure 11) initial invitation, or MGCF may be routed directly to E-CSCF 1160, S-CSCF or VCC application program 1170.Based on VDN, I-CSCF or S-CSCF (not shown) or E-CSCF 1160 will be activated to VCC application program 1170 based on the apps server terminal of PSI.

Step 5 (upgrade or re-invite).VCC application program 1170 is sent to the long-range described access leg that spreads out of of renewal of bringing in by will build on the access leg SDP that changes in the territory via E-CSCF 1160.Access leg upgrades and takes place according to the SIP session modification program among the IETF RFC 3261.VCC application program 1170 also can indicate the territory to shift to E-CSCF 1160 clearly.

Step 6 (positioned update).E-CSCF 1160 sends to grappling LRF1150 with positioned update with new SDP information.Minimally, E-CSCF 1160 to LRF 1150 indication existed the CS territory shift (for example, VCC application program 1170 can from VDN be not the use of VDI and/or the territory that relates to MGCF 1140 certainly shift learn exist the CS territory to shift).

Step 7 (upgrade or re-invite).If PSAP has IP ability (as illustrated among Figure 10 A), then described renewal continues to carry out to PSAP, if or PSAP only possess CS ability (as graphic extension among Figure 10 B), then described renewal continues to carry out to MGCF.

Step 8 (finishing of CS territory call leg).Between VCC application program 1170, E-CSCF 1160 or S-CSCF (if existence), I-CSCF (if existence), MGCF 1140, VMSC 1130 and UE 1110, set up and change call leg new in the CS territory over to.

Step 9 (release of source access leg).Discharge the previous access leg that imports into, the described access leg that imports into is the access leg of before setting up on IMS.If possible, UE 1110 should be in accesses network P-CSCF of institute and local network S-CSCF cancel register.

In one embodiment, program A can be subjected to following restriction to the continued support of locating after UE is transferred to the CS territory.If PSAP sends to grappling LRF to obtain the location of UE with request, then LRF possibly can't continue to use same program to obtain the location, because when UE is in the IMS territory, described program may be used (or estimating to be about to use).For example, used OMA SUPL if LRF once transports based on the SIP between UDP/IP, TCP/IP and LRF and the UE, then UE can prevent further use to SUPL to the access loss in PS territory at IMS after shift in the CS territory.In addition, LRF may be used for the CS urgent call with the control plane location solution (for example, in the clause 9.1.3 of 3GPP TS 23.271) that defines among the 3GPP TS 23.271, because it may not know the VMSC address.Yet, LRF can use the more general CS-MT-LR program of describing among the clause 9.1.1 of 3GPP TS 23.271 and the 9.1.2, and wherein said LRF (it shows as or IAD mobile positioning center (GMLC)) obtains the VMSC address by the local HLR/HSS of inquiry UE.Yet this HLR/HSS with shortcoming a: UE will need to support may exist between CS-MT-LR polling routine and network of being visited and the local network book keeping operation problem (because local network may not recognized the importance of urgent call).

IMS is shifted to CS-program B in the VI.A.2 territory

In alternate embodiment, no matter whether UE has sufficient voucher so that register in new institute's accesses network, can realize that program B that IMS shifts to the CS territory is all applicable to UE and can unrestrictedly realize locating the continuation of support.Yet in one embodiment, this program can be limited to the internetwork territory that belongs to same operator and shift.In addition, program B needs wherein to need not to know the new version that shift in the VCC territory of VDN in UE.The exemplary embodiment of Figure 12 graphic extension program B.

Step 1 (urgent set up (VCC)).If the user is not subordinated to the CS territory when UE need to determine the territory to transfer to CS, then UE 1210 can carry out CS subordinate (if it contains described voucher).Subsequently, it sends to VMSC 1230 (as defining among the 3GPP TS 24.008) urgent voice call starts in the CS territory by will promptly setting up message.The described message of promptly setting up can contain the indication of supporting relevant for VCC.Yet, need not to comprise any VDN.

(the MAP subscriber locatees (IMSI, IMEI)) to step 2.The ordering information that obtains based on local VMSC policy or based on the local HLR/HSS from UE or based on any VCC indication that receives step 1, VMSC 1230 send to MAP subscriber positioning reporting the GMLC 1250 that is associated with emergency services provider (PSAP) (call out will send to usually described emergency services provider).MAP subscriber positioning reporting carries and starts with being sent out to be used for common urgent call that (for example, the identical information of the step 4) among Fig. 8 wherein comprises IMSI, MSISDN, IMEI, VMSC address and Serving cell identity or SAL.In one embodiment, do not comprise location estimation, but can comprise the indication of using about VCC.

Step 3 (MAP subscriber positioning confirmation (VDN)).Based on local policy or owing in step 2, receive the VCC indication, GMLC and the LRF that is associated are (for example, logic LRF in the physical entity identical) with GMLC or the LRF reciprocation that is associated with a group with initial UE 1210 call records of setting up among (for example, using the program described in Fig. 7 or Fig. 8) search grappling LRF 1250.IMSI, MSISDN and/or IMEI that grappling LRF 1250 can use in the step 2 and be received discern correct call record.Do not indicate the VCC territory to shift in step 1 if can not find any call record and UE, then GMLC 1250 can think that this is new urgent call and continues to set up described urgent call-for example, as among Fig. 8 under the situation of supporting the VCC that the CS urgent call is started.If indicated the VCC territory to shift in step 1 if can not find described call record and UE, then GMLC 1250 can return mistake with MAP subscriber positioning reporting on the contrary and turn back to the VMSC (not shown), and VMSC attempts call release.From user's angle, this will make UE call release and permission user attempt urgent call again after failure is shifted in the VCC territory.Otherwise if find call record, then GMLC 1250 confirms to turn back to VMSC1230 with MAP subscriber positioning reporting, and described MAP subscriber positioning reporting is confirmed to carry to set up the required VDN of new access leg.When the originating call first time (for example, in the step 6 of Fig. 7 or in the step 9 of Fig. 8), LRF 1250 will obtain VDN, and when the call record among the GMLC 1250 location LRF, VDN will be provided to GMLC 1250.Existing NA-ESRK or existing NA-ESRD parameter can be carried to VDN in the affirmation of MAP subscriber positioning reporting.In step 2, GMLC 1250 also stores the information that receives from VMSC 1230.

Step 4 (IAM (VDN)).VMSC 1230 comes the new branch road of route based on the VDN that receives in the step 3.If use existing NA-ESRK or NA-ESRD parameter to pass on VDN, then calling out route can be with to be used for the described route that common urgent call starts identical.Based on the VDN route, the IMS network that originally VMSC 1230 routes the call to be visited via the MGCF1240 in institute's accesses network.

Step 5 (inviting (VCC application program)).The I-CSCF initial invitation of MGCF 1240 in visit IMS (not shown), or MGCF 1240 may be routed directly to E-CSCF 1260, S-CSCF (not shown) or VCC application program 1270.I-CSCF or S-CSCF (not shown) or E-CSCF 1260 will be activated to VCC application program 1270 based on the apps server terminal of PSI based on VDN.

Step 6 (upgrade or re-invite).VCC application program 1270 by will build on via E-CSCF 1260 the access leg SDP that changes in the territory be sent to long-range bring in to upgrade spread out of access leg.Access leg upgrades and takes place according to the SIP session modification program among the IETFRFC 3261.VCC application program 1270 also can shift to E-CSCF1260 indication CS territory clearly.

Step 7 (positioned update).E-CSCF 1260 sends to grappling LRF1250 with positioned update with new SDP information.Minimally, E-CSCF 1260 has existed the CS territory to shift to LRF 1250 indications.LRF 1250 makes this indication relevant with the indication of shifting about determined territory in the step 3, and definite UE 1210 has changed into the territory territory of indication in the step 2 at present.LRF 1250 is sent to this information the GMLC that is selected by VMSC 1230 in step 2.

Step 8 (upgrade or re-invite).Described renewal proceeds to PSAP (as illustrated among Figure 10 A) or proceeds to MGCF (as illustrated among Figure 10 B).

Step 9 (release of source access leg).Between VCC application program 1270, E-CSCF 1260 or S-CSCF (if existence), I-CSCF (if existence), MGCF 1240, VMSC 1230 and UE 1210, set up the new call leg that changes in the CS territory.

Step 10 (remainder of CS call setup).Source of release access leg, described source access leg are the access leg of before setting up on IMS.If possible, UE 1210 should be in accesses network P-CSCF of institute and local network S-CSCF cancel register.

In one embodiment, in the step 1 of Figure 12, promptly set up and to comprise VCC indication in the emergency class parameter in the message as new service type (thereby because 3 spare biies of current existence can define nearly 3 new service types).In this embodiment, UE can come initial orders B and initial orders A (allowing under the situation of two programs) not based on following information:

(m) but according to original institute's accesses network to UE indication support program B.

(n) UE determine new CS territory of visiting and original the IMS that visits or CS territory by same operator all, or as the part of consolidated network, or have the layout of support program B.

(o) be present in the information (for example, providing) of the support program B among the UE by local network operator.

Can use any one that is used for passing on for information about replacement scheme of VCC (replacement scheme (e), (f) or (g)) described in the chapters and sections III.B, come to pass on indication in (m) clearly or impliedly to UE to UE.

Determining (n) can be discerned based on detecting the same operator that original institute's access domain and new institute visited in the CS territory, for example, and identical MCC-MNC.As an alternative, determining can be based on the system broadcast information that receives from new institute's accesses network (for example, the information of the described new accesses network support program B of institute and possibly to the identification of other network of support program B).Another is chosen as, (m) and (n) both determine can based on can discern all operations person of layout with support program B and be stored among the SIM/USIM of UE (for example, such as (o) middle permission) information.

Except allowing unwarranted UE to carry out the transfer of territory, program B can also make grappling LRF can utilize the common finder that is defined among the 3GPPTS 23.271 (for example, in clause 9.1.3) to locate the UE of the urgent call of starting.This is achieved owing to the step 2 among Figure 12 and step 3.In step 2 and step 3, VMSC obtain and storage about the information of GMLC, and LRF and GMLC obtains and storage about the information of VMSC.Then, this can permit CS-MT-LR and need not to inquire about the local HSS/HLR of UE.

In one embodiment, the further aspect of program B is: the calling program of starting at VMSC place can be identical with the calling of circuit common pattern urgent call (as defining among 3GPP TS 23.271 and the common TIA/EIA/ATIS J-STD-036) program that starts, and/or can be identical with CS calling that the VCC of urgent call (as describing among Fig. 8) the supports program that starts that starts.From the angle of GMLC, described program aspect the MAP signaling transaction of VMSC with the program of circuit common pattern urgent call much at one.

In the situation of 3GPP2, Figure 12 also can be suitable for describing the program B that IMS shifts to the CS territory except following aspect: except replacing the VCC application program with 3GPP2 simulation entity, can also simulate 3GPP2 message and come the 3GPP MAP message shown in step of replacing 2 and 3.In this case, the 3GPP2 message in the step 2 and 3 will be respectively 3GPP2MAP origination request and the affirmation of MAP origination request; MSISDN in the step 2 and 3 will be replaced by mobile identification number (MIN) or mobile directory number, MDN (MDN), and the GMLC among Figure 12 will be replaced by 3GPP2 mobile positioning center (MPC).

CS is shifted to IMS in the VI.B territory

For supporting the territory of urgent call from the CS territory to the IMS territory to shift, this paper describes two kinds of optional procedures.

CS is shifted to IMS-program C in the VI.B.1 territory

In the described program C of these chapters and sections, UE with VCC ability shows as common VCC (being described among the 3GPP TS 23.206), and use replacement scheme (e) described in the chapters and sections III.B above, (f), (g) or (h) in any one and use the VDI that obtains from institute's accesses network or local network the IMS territory to the VCC application program new call leg that starts.Can call out as the common SIP of starting and handle described calling, and therefore described calling only applicable to having abundant voucher so that the UE that in new institute's accesses network, registers.It is illustrated among Figure 13.

Step 1 (inviting (VDI)).If the user is to the IMS registration, then as the 1310 initial registrations to IMS of defined UE among the 3GPP TS 23.206 when UE 1310 determines to shift to the territory of IMS.Subsequently, it uses previously the VCC application program 1350 initial IMSs of VDI in original institute's accesses network that obtain from institute's accesses network (for example, as at above chapters and sections IV and Fig. 7 and Fig. 8 described in) to start session to set up access leg via IMS and to ask the territory transfer of mobile C S session to IMS.But SIP invites route to pass new institute's accesses network or P-CSCF in the local network (not shown) and the S-CSCF in the local network (not shown), and will arrive S-CSCF (not shown) or E-CSCF 1340 preferably in original institute's accesses network at last.

Step 2 (inviting (VDI)).S-CSCF (not shown) in original institute's accesses network or E-CSCF 1340 manage the IMS session everywhere and it are delivered to VCC application program 1350.

Step 3 (upgrade or re-invite).VCC application program 1350 is finished the new foundation of importing access leg into via IMS.VCC application program 1350 is upgraded long-range branch road as the access leg refresh routine of stipulating among the 3GPP TS 23.206 with the link information of newly setting up access leg by use and is carried out the territory transfer.With described renewal or re-invite and send to E-CSCF 1340 to be used for originating call (for example, according to Fig. 7 or Fig. 8).VCC application program 1350 also can shift to E-CSCF 1340 indication territories clearly.

Step 4 (positioned update).The SDP information updating grappling LRF 1330 that E-CSCF 1340 usefulness are new, for example, indication UE 1310 is using the IMS territory now and UE IP is being provided the address.

Step 5 (upgrade or re-invite).Described renewal proceeds to PSAP (as illustrated among Figure 10 A) or MGCF (as illustrated among Figure 10 B).

Step 6 (release of source access leg).Subsequently, as defined source of release access leg among the 3GPP TS 23.206, described source access leg is the access leg of before setting up on CS.This comprises by E-CSCF 1340 and discharges the previous CS branch road that imports into.

Since LRF should have the IP address of UE now and therefore can call OMA SUPL (or any other relate to the location solution (for example, 3GPP2X.S0024)) that IP carries, so in case program C finish and may continue as UE and provide the location to support.Yet, have the clause 9.1.1 of use 3GPP TS 23.271 and the more general PS-MT-LR program described in the 9.1.6 (wherein LRF inquires the SGSN address of being visited to the local HLR/HSS of UE) only, just can use 3GPP control plane solution to come to insert realization UE location as GPRS.

CS is shifted to IMS-program D in the VI.B.2 territory

In alternate embodiment, no matter whether UE 1410 has the sufficient voucher of registering in new PLMN, and the program D that supports CS to shift to the IMS territory all will be applicable to UE 1410.The less-restrictive that described program is supported continuous positioning.The exemplary embodiment of Figure 14 graphic extension program D.

Step 1 (inviting (promptly)).Before sending described invitation, if UE 1410 contains the voucher (that is, not using common registration) as defining among the 3GPP TS23.167 fully, then it is understood new the visit in the IMS network and carries out Emmergency log-on.For the callback (via new institute's accesses network) of supporting UE 1420 and by being discerned UE 1420 among the IMS in new visiting, described Emmergency log-on is essential.Then, UE 1410 will indicate the invitation of IMS urgent call to send to P-CSCF in new institute's accesses network (showing among Figure 14).SIP To header in the described invitation can contain the SIP URI that shift in the existing urgent call VCC territory of indication.Can easily this SIP URI be added to other need support the SIP URI of urgent call and need not any new SIP signaling and change.Described SIP invites also can comprise the route header, described route header contains the address information of original institute's accesses network, for example, the SIP URI of the original institute accesses network of creating from MCC-MNC (Mobile Country Code MCC and Mobile Network Code), and the described possibly sub-district ID and the locating area of originating call for the first time.Indication based on the VCC territory transfer that has urgent call now, P-CSCF and never call VCC support (for example, by as among Fig. 7 permission VCC application program in new institute's accesses network is transferred in SIP invitation) and on the contrary with as described in invitation be delivered to local E-CSCF 1430.

Step 2 (retrieval location).Based on the indication that shift in the VCC territory, if any address information about original institute accesses network that receives in step 1 enough accurately consequently can be determined the required VDI of route subsequently, then E-CSCF 1430 can proceed to step 5.Otherwise E-CSCF 1430 is from LRF 1440 (it can be local LRF 1440, or the indicated LRF1450 of route header information as being provided by UE 1420 in the step 1 in the original institute accesses network is provided) request location and routing iinformation.E-CSCF 1430 provides UE identifying information for LRF 1440, for example, and IMSI, MSISDN, IMEI.E-CSCF 1430 also indicates the VCC territory to shift.

Step 3 (retrieval call record).LRF 1440 can build on original call record among the grappling LRF with search when starting urgent call for the first time according to Fig. 7 or Fig. 8 with other LRF 1450 reciprocations.If LRF 1430 is (or supporting original institute accesses network) in original institute accesses network, then described reciprocation and search will more be limited to, and for example, LRF self may be described grappling LRF.

Step 4 (restoring to normal position (VDI)).If find described call record, then LRF 1430 can turn back to E-CSCF 1420 with the form of VDI with routing iinformation.

Step 5 (inviting (VDI)).The VDI that use is determined or provided by LRF 1440 in step 4 in step 2, E-CSCF 1430 can will invite the VCC application program 1470 directly be forwarded in the original institute accesses network or it is forwarded to IMS core (for example, E-CSCF 1460) in the original institute accesses network.

Step 6 (inviting (VDI)).If desired, the IMS core in the then original institute accesses network (for example, E-CSCF1460) is forwarded to VCC application program 1470 with described invitation.

Step 7 (upgrade or re-invite).VCC application program 1470 by will build on via E-CSCF 1460 the access leg SDP that changes in the territory be sent to long-range bring in to upgrade spread out of access leg.VCC application program 1470 also can shift to E-CSCF 1460 indication territories clearly.

Step 8 (positioned update).The SDP information that E-CSCF 1460 usefulness are new (for example, it indicates the IP address that UE 1420 is using the IMS territory and UE is provided) is upgraded grappling LRF 1450.

Step 9 (upgrade or re-invite).Described renewal continues to PSAP (as illustrated among Figure 10 A) or MGCF (as illustrated among Figure 10 B).

Step 10 (release of source access leg).Subsequently, as defined source of release access leg among the 3GPP TS 23.206, described source access leg is the access leg of before setting up on CS.This comprises by E-CSCF and discharges the previous CS branch road that imports into.Program among Figure 14 applicable to the registration and unregistered UE both.Continuing the location support also can be identical with program C, for example, is used for the 3GPP PS-MT-LR program that GPRS inserts the location by using the UE IP address or the use that are provided to grappling LRF 1450 among OMA SUPL and Figure 14 in the step 8.Yet, as extra benefit, can use (in clause 9.1.6A and 9.1.7) defines among the 3GPP TS 23.271 urgent call special-purpose 3GPP PS-NI-LR and PS-MT-LR program.Insert and/or the foundation of GPRS PDP environment and indicating emergency is called out if UE is GPRS, then this can realize.This can cause SGSN excitation PS-NI-LR so that obtain the location or its address is provided to GMLC.If GMLC is associated with grappling LRF, the address of Serving GPRS Support Node (SGSN) then can be provided to grappling LRF, make thus and can use PS-MT-LR and needn't inquire about local HLR/HSS (and under the situation that may not use any HLR/HSS, also allowing UE is without permission positioned).Yet this ability can be limited to the situation that wherein same operator has new and original institute's accesses network simultaneously.

Various aspect of the present invention has above been described.Should be clear, both are only representative can various forms to implement this paper teaching and any ad hoc structure disclosed herein, function or this.Based on this paper teaching, the technical staff in the technical field should be appreciated that, aspect disclosed herein can be independent of that any others are implemented and can make up two or more aspects in these aspects in every way.For example, can use any amount of aspect described herein to implement a kind of a kind of method of installing or put into practice.In addition, one or more in aspect described herein, also can use other structure, function or structure and functionally implement described device or put into practice described method.As the example of some above-mentioned notion, in certain aspects, can set up some parallel channel based on pulse repetition frequency.In certain aspects, can set up parallel channel based on pulse position or skew.In certain aspects, can set up parallel channel based on time-hopping sequence.In certain aspects, can set up parallel channel based on pulse repetition frequency, pulse position or skew and time-hopping sequence.

The person of ordinary skill in the field should be appreciated that, can use in various different technologies and the skill and technique any to come expression information and signal.For example, above data, instruction, order, information, signal, position, symbol and the chip that may mention in the whole text of specification all can be represented by voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or light particle or its arbitrary combination.

The person of ordinary skill in the field should be further appreciated that also various exemplary logical block, module, circuit and the algorithm steps described in conjunction with embodiment disclosed herein can be embodied as electronic hardware, computer software or the combination of the two.For clearly setting forth this kind interchangeability of hardware and software, above draw outlines of the function of various Illustrative components, piece, module, circuit and step.This function is embodied as the design constraints that hardware or software depend on application-specific and puts on whole system.The person of ordinary skill in the field can implement described function by different way at each application-specific, but the decision of this type of embodiment should be interpreted as causing deviating from scope of the present invention.

Various illustrative components, blocks, module and the circuit of describing in conjunction with embodiment disclosed herein can be used with lower device and implement or carry out: general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or its through design to carry out any combination of function described herein.General processor can be a microprocessor, but another selection is that described processor can be processor, controller, microcontroller or the state machine of any routine.Processor also can be embodied as the combination of calculation element, for example, and the associating of the combination of DSP and microprocessor, a plurality of microprocessor, one or more microprocessors and DSP core or any other this configuration.

Should be appreciated that the example that any concrete steps order in any institute announcement process or classification are exemplary methods.Preferential selection based on design should be appreciated that, can rearrange sequence of steps concrete in the described process or classification and remains on simultaneously in the scope of disclosure of the present invention.The claim to a method item of enclosing has proposed the element of different step according to example order, and is not to plan to be confined to the concrete order or the classification that are proposed.

Software module or this both combination that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can be embodied directly as hardware, be carried out by processor.Software module can reside in the medium of known any other form of incoming memory (RAM), flash memory, read-only memory (ROM), electronic programmable ROM (EPROM), electronics erasable programmable ROM (EEPROM), register, hard disk, removable disk, CD-ROM or person of ordinary skill in the field at random.Exemplary storage medium is coupled to processor, so that described processor can write wherein from described read information or with information.Perhaps, described medium can be the part of processor.Processor and medium can reside among the ASIC.Described ASIC can reside in the user terminal (UE).Perhaps, processor and medium can be used as discrete component and reside in the user terminal (or UE).

Above provide explanation to be intended to make the person of ordinary skill in the field can make or use the present invention to announcement embodiment.The person of ordinary skill in the field will be easy to draw the various modifications of these embodiment, and the General Principle that this paper defined is also applicable to other embodiment, and not deviate from the spirit or scope of the present invention.Therefore, this paper is not that plan is defined in embodiment illustrated herein with the present invention, and will give itself and principle disclosed herein and novel feature corresponding to broad range.

Claims (26)

1, a kind of system that in the wireless access environment, supports the voice call continuation (VCC) of urgent call, it comprises:

VCC application program in the internet protocol multimedia subsystem of being visited (IMS), it shifts in order to promote the territory between described IMS subsystem of visiting and circuit switching (CS) subsystem; And

Described emergency call session controlled function (E-CSCF) subsystem of visiting in the IMS subsystem, it is operatively coupled to described VCC application program and shifts to promote the territory between described IMS subsystem and the described CS subsystem.

2, the system as claimed in claim 1, the wherein said IMS subsystem of visiting further comprises MGCF (MGCF) subsystem that is operatively coupled to described E-CSCF subsystem.

3, system as claimed in claim 2, the wherein said IMS subsystem of visiting further comprises media gateway (MGW) subsystem that is operatively coupled to described MGCF subsystem.

4, system as claimed in claim 2, wherein said CS subsystem further comprises moving with the speech of described MGCF subsystem communication serves switching center (VMSC) subsystem.

5, the system as claimed in claim 1, it further comprises at least one subscriber equipment (UE) unit.

6, system as claimed in claim 5, it further comprises and is operatively coupled to described UE unit to promote Proxy Call Session Control Function (P-CSCF) subsystem of communication.

7, the system as claimed in claim 1, it further comprises retrieval by window function (LRF) subsystem, described retrieval by window function (LRF) subsystem is operatively coupled to the retrieval function associated of described E-CSCF subsystem and its execution and locating information.

8, the system as claimed in claim 1, the wherein said IMS subsystem of visiting is in institute's accesses network.

9, the system as claimed in claim 1, the wherein said IMS subsystem of visiting is in local network.

10, a kind of method of in the wireless access environment, supporting the voice call continuation (VCC) of urgent call, it comprises:

Promote the territory between internet protocol multimedia subsystem (IMS) and circuit switching (CS) subsystem to shift by the VCC application program; And

Promote the territory between internet protocol multimedia subsystem (IMS) and circuit switching (CS) subsystem to shift by emergency call session controlled function (E-CSCF).

11, method as claimed in claim 10, it further comprises the urgent call of authorized user device (UE) that support to hang oneself.

12, method as claimed in claim 10, it further comprises the urgent call of support from unauthorized user's equipment (UE).

13, method as claimed in claim 10, it further comprises the urgent call of support from the subscriber equipment in the local network (UE).

14, method as claimed in claim 10, it further is included in from the first Radio Access Network VCC and transfers to second Radio Access Network location of retrieval user equipment (UE) afterwards.

15, method as claimed in claim 14, it further is included in and spreads out of on the call leg from the continuation of the described E-SCSF of described VCC application call to realize that the location is supported.

16, method as claimed in claim 10, it further comprises the VCC relevant information of reception and registration from subscriber equipment (UE).

17, method as claimed in claim 10, it further is included in and is used for IMS and indicates VCC to the message of promptly setting up that CS shifts.

18, method as claimed in claim 10, its further comprise use from move serve switching center (MSC) to the existing MAP of Gateway Mobile Location Center (GMLC) inquire about with for described MSC partially or completely transparent way route emergency calls to described VCC application program.

19, method as claimed in claim 10, it further comprises carries out positioned update to retrieval by window function (LRF).

20, method as claimed in claim 10, its further comprise use from move Gateway Mobile Location Center (GMLC) inquiry serve switching center (MSC) come with for described MSC partially or completely transparent way promote described territory to shift.

21, method as claimed in claim 10, it further comprises when setting up urgent call grappling retrieval by window in grappling retrieval by window function (LRF).

22, a kind of system that in the wireless access environment, supports the voice call continuation (VCC) of urgent call, it comprises:

First device, it is used to promote the territory between institute's access the Internet protocol multi-media sub-system (IMS) subsystem and circuit switching (CS) subsystem to shift; And

Second device, it is visited in the IMS subsystem described, and it is operatively coupled to described first device to be used to the promoting territory between described IMS subsystem and the described CS subsystem to shift.

23, a kind of computer-readable media that is used for supporting the voice call continuation (VCC) of urgent call at the wireless access environment, described computer-readable media comprises the sign indicating number that causes at least one calculation element to carry out following operation:

Promote the territory between internet protocol multimedia subsystem (IMS) and circuit switching (CS) subsystem to shift by emergency call session controlled function (E-CSCF); And

The location of retrieval user equipment (UE), it occurs in after the first Radio Access Network VCC transfers to second Radio Access Network.

24, computer-readable media as claimed in claim 23, wherein said UE are through authorizing UE.

25, computer-readable media as claimed in claim 23, wherein said UE are unwarranted UE.

26, computer-readable media as claimed in claim 23, wherein said UE is in local network.

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