CN1856162A

CN1856162A - Domain switching controller, and its method and system

Info

Publication number: CN1856162A
Application number: CNA2005100665951A
Authority: CN
Inventors: 朱进国
Original assignee: ZTE Corp
Priority date: 2005-04-28
Filing date: 2005-04-28
Publication date: 2006-11-01
Anticipated expiration: 2025-04-28
Also published as: CN100417291C

Abstract

The invention is concerned with the switch method and the system between the territory, and the using switch controller of the territory: sets the switch controller of the territory in the system with the first territory and the second territory that the two territory are routed, specifies a switch controller of the territory for the double-module terminal of the signed switch operation between the territory; the terminal A initiates the call of other terminals, establishes the signaling contact of the first territory and the switch controller of the territory, and saves the calling information and the correlation of the terminal A to the first territory or the first territory to other terminals; initiates the call from the second territory to inform the switch by the switch controller of the territory and carry the number of the terminal A when the terminal A needs to switch to the second territory; the switch controller of the territory establishes the call between the first territory and the second territory, and establishes the signaling link and the loading link from the terminal A, the second territory, the first territory and other terminals in the order; indicates release the signaling link and the loading link from the first territory to the terminal A. the invention can achieve the non-slot switch between at least two different territories.

Description

The method of switching between a kind of territory, system and used territory switch controller

Technical field

The present invention relates to call out between two territories of control in the wireless telecommunication system territory method for switching between and the device thereof of seamless switching.

Background technology

In second generation mobile communication system, there are two territory: GSM (GlobalSystem for Mobile communications in mobile communication system, Global Systems for Mobile communications) and GPRS (GeneralPacket Radio Service, GPRS), GSM mainly provides speech business and circuit type data service, and GPRS mainly provides data service at a high speed.3-G (Generation Three mobile communication system) Release 99 and 4 stages of Release have been arrived, GSM in the second generation communication system and GPRS territory have evolved to UMTS CS (Universal Mobile Telecommunications System CircuitSwitched respectively, the universal mobile telecommunications system circuit switching) territory and UMTS PS (Universal MobileTelecommunications System Packet Switched, the universal mobile telecommunications system packet switching) separating of control and carrying realized in territory, Release 4 the inside circuit domain.The second generation and 3-G (Generation Three mobile communication system) all are to adopt the coverage mode of cellular cell.If ongoing calling party move to the sub-district around, because the signal weakening of this sub-district, for the continuity that guarantees to call out, just may switch: the sub-district of user a little less than first signal switches to second sub-district that signal is strong, and keeps calling out uninterrupted.Because the calling in two territories is separate, so the switching in this time generally all is to occur in inside, a territory, united by wireless side and network side and finishes switching

ALL IP (all-IP) network is the direction of mobile communication system development, so arrived among the Release 5,3GPP (Third Generation Partnership Project, 3G (Third Generation) Moblie partner plan) on basis, UMTS PS territory, introduced a new IMS (IP Multimedia Subsystem, IP Multimedia System) territory, the IMS network is the network of an all-IP, with SIP (Session Initiated Protocol, session initiation protocol) is core technology, for the user provides abundant more multimedia communication service, comprise traditional speech business certainly.

The IMS of definition is one and has realized separating of IP control and carrying with the network frame of UMTS PS territory as the all-IP that inserts among the Release 5, and a call establishment is divided into that signaling link is set up and bearing link is set up two parts.Defined use WLAN (Wireless Local AreaNetwork among the Release 6, WLAN (wireless local area network)) come access belonging IMS so that VoIP to be provided (Voice Over IP, speech business on the IP) business under WLAN covers, is supported existing most of GSM/UMTS business.

Like this, call out for a user's voice, just can provide by plurality of access modes, such as calling out by traditional UMTS CS network, perhaps insert IMS by WLAN (perhaps UMTS PS) and call out, the user can dispose and select certain access way according to hobby or the operator of oneself.

The radio characteristics of different access waies may be different, and wireless coverage may be overlapped, may be overlapped such as UMTS CS covering and WLAN covering.Like this, when an audio call that inserts from UMTS CS moves to the edge of UMTS CS covering, continue to move outward, calling may be interrupted again.If this moment, the covering of WLAN was fine, the user may wish to cover from UMTS CS so, switches to WLAN and covers, and keep ongoing calling uninterrupted.Because UMTS CS covers and the WLAN covering is two not same areas, so call out the problem how to switch with regard to having produced between two territories.

For some real time business, such as audio call, the user may require time delay for switching enough little, and for some non-real-time service, such as web page browsing, does not then require.Because different territories may belong to different operators, therefore when switching, also need to consider the user is carried out authentication.Also need to consider how to charge in the handoff procedure in addition.

For above problem, also there is not effective solution in the prior art.

Summary of the invention

The technical problem to be solved in the present invention is to provide the method for switching between the territory in a kind of mobile communcations system, can realize calling out at two seamless switchings between the same area not.The present invention also will provide a kind of be used to the realize system of this method and the territory switch controller of use thereof.

In order to address the above problem, the invention provides the method for switching between the territory in a kind of communication system, may further comprise the steps:

(a) in the system that comprises first and second territories at least, the territory switch controller that at least one all can be routed to is set, in these two territories to inserting these two territories and the terminal A of the service switchover between the territory of having contracted, for it specifies same territory switch controller;

(b) terminal A is initiated to the calling of other terminal from first territory, be established to the signaling link and the bearing link of other terminal by first territory, in call establishment, also set up the signaling contact of first territory and described territory switch controller, described territory switch controller is preserved terminal A to first territory, first territory is to the call information of other terminal, with the number of terminal A (this number definiteness phone number that differs, also can refer to terminal A other unique identification in a territory, as the number difference of terminal A in two territories, the territory switch controller should be set up two corresponding relations between number) be associated;

(c) terminal A detects in the time of need switching to second territory, be initiated to the calling of described territory switch controller from second territory, set up terminal A to second territory, arrive the signaling contact of described territory switch controller again, notify described territory switch controller to switch the also number of carried terminal A;

(d) described territory switch controller notified after, when allowing to switch on inspection, the inter-domain call between first territory, second territory is created in indication first or second territory, and according to the number of terminal A the calling to other terminal couples together to calling, inter-domain call and first territory in second territory with terminal A, finally set up terminal A to second territory, again to first territory, arrive the signaling link and the bearing link of other terminal again, preserve the call information of described three sections callings and the number by terminal A is associated at described territory switch controller;

(e) switch controller indication in described territory discharges signaling link and the bearing link of first territory to terminal A, and keeps and the signaling in first territory is got in touch, and terminal A switches to second territory from first territory.

Further, said method also can have following characteristics: described step (e1) back is further comprising the steps of:

(f) terminal A detects when needing to switch go back to first territory, notifies described territory switch controller to switch the number of carried terminal A;

(g) calling of first territory to terminal A set up in switch controller indication in described territory, finds calling and the connection of already present first territory to other terminal according to the number of terminal A, sets up terminal A to first territory, arrive the signaling link and the bearing link of other terminal again;

(h) indication of described territory switch controller discharge second territory to first territory, second territory is to signaling link and the bearing link of terminal A, terminal A switches back to first territory from second territory.

Further, said method also can have following characteristics: terminal A can also insert the 3rd territory, and the service switchover and be assigned to described territory switch controller of having contracted in this territory between the territory, further comprising the steps of in described step (e) back:

(f ') terminal A detects needs follow-up the 3rd territory that switches to, be initiated to the calling of described territory switch controller from the 3rd territory, set up terminal A to the three territories, arrive the signaling contact of described territory switch controller again, notify described territory switch controller to switch the also number of carried terminal A;

(g ') is after described territory switch controller is notified, when allowing to switch on inspection, the inter-domain call between first territory, the 3rd territory is created in indication the first or the 3rd territory, and the calling to other terminal of calling, inter-domain call and first territory in terminal A to the three territories is coupled together according to the number of terminal A, finally set up terminal A to the three territories, again to first territory, arrive the signaling link and the bearing link of other terminal again, preserve the call information of described three sections callings and the number by terminal A is associated at described territory switch controller;

The indication of (h ') described territory switch controller discharges signaling and the bearing link of second territory to terminal A, second territory to first territory, and terminal A finishes from the switching in three territories, second territory to the.

Further, said method also can have following characteristics: described two territories are meant universal mobile telecommunications system circuit commutative field and IMS domain, and described territory switch controller in described universal mobile telecommunications system circuit commutative field as service control point, in described IMS domain as application server.

Further, said method also can have following characteristics: described territory switch controller also is responsible for the charge information of collection terminal A in first territory and second territory, and the charge information in these two territories is associated.

Further, said method also can have following characteristics: in the described step (f), terminal A is the signaling contact of arriving described territory switch controller in original second territory by being initiated to the calling of described territory switch controller in first territory, perhaps utilizing, and notifies described territory switch controller to switch.

Further, said method also can have following characteristics: when described territory switch controller couples together two sections callings, to the IP carrying, also earlier exchange and consult the beared information of these two callings mutually.

Further, said method also can have following characteristics: in the described step (c), when terminal A notifies described territory switch controller to switch, also carry the beared information of terminal A in second territory.

Further, said method also can have following characteristics: in the described step (a), when terminal A is initiated to the calling of other terminal from described circuit commutative field, it is the customization application process that is triggered to the mobile network enhancing logic of described territory switch controller by first territory, set up the applying portion dialogue, realize what mutual signaling was got in touch.

Further, said method also can have following characteristics: in the described step (a), when terminal A is initiated to the calling of other terminal from described IMS domain, call server controlled function in this territory is according to whether carrying the number of described territory switch controller in this territory in this calling, perhaps whether this user has the attribute of service switchover between signatory territory, determine whether routing the call to described territory switch controller, the number of described territory switch controller in IMS domain brings terminal A or call server controlled function by enrollment process, perhaps at terminal A or/and the local configuration of call server controlled function.

Further, said method also can have following characteristics: in the described step (d), no matter terminal A need switch to IMS domain from the universal mobile telecommunications system circuit commutative field, perhaps opposite, described territory switch controller all is that the mobile switching centre of indication universal mobile telecommunications system circuit commutative field initiates cross-domain call, is destination Mobile Station International ISDN Number with described territory switch controller at the number of IMS domain.

Territory switch controller in the communication system provided by the invention comprises switching controls module, message processing module, wherein:

Described switching controls module further comprises: inspection unit, be used for when terminal request is switched, checking its business datum, and judge whether to allow to switch; Call out creating unit, be used in reference to be shown in and create a new calling on the territory that will switch to, perhaps create a new cross-domain call; Call out releasing unit, be used for after switching is finished, indicating discharging signaling and the bearing link that terminal is arrived in former territory;

Described message processing module is used for preserving the relevant information that call out in two territories, and according to the call information of the related same user of the number of terminal in two territories.

Whether signatory further, above-mentioned territory switch controller also can have following characteristics: also comprise information storage module, be used to preserve attribute of user data and business datum, comprise the attribute of service switchover between user territory, be used to judge whether allow to switch.

Further, above-mentioned territory switch controller also can have following characteristics: also comprise accounting module, be used to collect the charge information in two territories and be associated with respective call.

Further, above-mentioned territory switch controller also can have following characteristics: described switching controls module also comprises the bearer negotiation unit, is used for exchanging mutually and negotiating bearer information between two callings.

The communication system that switches between the territory of realizing provided by the invention comprises terminal, and first territory and second territory that can intercommunication, it is characterized in that, also comprise at least one territory switch controller, this territory switch controller basis routing mode separately in first and second territories can both be routed to

Described territory switch controller comprises switching controls module and message processing module, this switching controls module is used to judge whether allow to switch, indication is created in the territory on certain territory or the calling between the territory, indication discharges signaling and the bearing link of former territory to terminal after switching, and exchanges mutually and negotiating bearer information between two callings; This message processing module is used for preserving the relevant information that call out in two territories, and according to setting the call information of the same user of rule association in two territories;

Described terminal is a dual-mode terminal, can insert first territory and second territory, and can select a kind of access way automatically, and when calling on having a certain territory or session, this terminal can be initiated registration and session in another territory simultaneously, or calls out.

Further, said system also can have following characteristics: described two territories are meant universal mobile telecommunications system circuit commutative field and IMS domain, and described territory switch controller in described universal mobile telecommunications system circuit commutative field as service control point, in described IMS domain as application server.

As from the foregoing, the present invention proposes the technology that a kind of solution is not switched between the same area, can realize calling out at least two seamless switchings between the same area not.Further, after switching to second territory, can also follow-uply switch back to first territory, the perhaps follow-up switching that switches to the 3rd territory from first territory.The technology of the present invention is not limited to solve between the territory of voice to be switched, and also can be used in other business.

Description of drawings

Fig. 1 is that the embodiment of the invention first terminal inserts from first territory, is initiated to the calling of second terminal and sets up signaling link and bearing link, and wherein, bearing link represents that with heavy line signaling link is represented with fine line.

Fig. 2 is that the embodiment of the invention first terminal switches to the basic principle figure in second territory.

Fig. 3 is that the embodiment of the invention first terminal is switched back the basic principle figure in first territory.

Fig. 4 A, Fig. 4 B, Fig. 4 C, Fig. 4 D are the networking diagrams of the present invention's enforcement of switching between CS territory and MIS territory.Before wherein Fig. 4 A illustrates switching, the situation that UEA calls out in the CS territory; Fig. 4 B illustrates UEA and switches to situation behind the IMS territory from the CS territory; Before Fig. 4 C illustrates switching, the situation that UEA calls out in the IMS territory; Fig. 4 D illustrates UEA and switches to situation behind the CS territory from the IMS territory.

Fig. 5 is that example dual-mode terminal of the present invention is called out PSTN, and dual-mode terminal switches to the flow chart in IMS territory and switchback CS territory from the CS territory.

Fig. 6 is that example dual-mode terminal of the present invention is called out PSTN, and dual-mode terminal switches to the flow chart in CS territory and switchback IMS territory from the IMS territory.

Embodiment

The schematic diagram of present embodiment system as shown in Figure 1, comprise first terminal 100, second terminal 140, first territory 110, second territory 120, called territory 130 and territory switch controller 150, the called territory at second terminal, 140 places may be identical with first, second territory, also may be other territory.

Territory switch controller 150 can both be routed to according to separately routing mode in relating to first and second territories of switching, and the sign in two territories, the address can be different.This controller have following three with the territory between switch relevant functional module:

The switching controls module can be controlled the calling in two territories that relate to switching simultaneously.Further comprise inspection unit, be used for when terminal request is switched, checking its business datum, judge whether to allow to switch; Call out creating unit, be used in reference to be shown in and create a new calling on the territory that will switch to, perhaps create a new cross-domain call; Call out releasing unit, be used for after switching is finished, indicating discharging signaling and the bearing link that terminal is arrived in former territory; The bearer negotiation unit is used for exchanging mutually and negotiating bearer information between two callings.

Message processing module: be used for preserving the relevant information that call out in two territories, and according to setting the all-calls information of the same user of rule association in two territories, as the number by terminal.

Information storage module: be used to preserve attribute of user data and business datum, comprise the attribute of service switchover between the whether signatory territory of user, be used to judge whether allow to switch.But this module is that optionally these user data also can leave on the miscellaneous equipment, obtain by visiting.

Accounting module is used to collect the charge information in two territories and is associated with respective call.

The terminal of implementing to switch must adopt dual-mode handset, can insert first territory and second territory (as IMS territory and CS territory), and can select a kind of access way automatically, when calling on having a certain territory or session, terminal can be initiated registration and session in another territory simultaneously, or calls out;

Before this system applies the inventive method, the business that the user must be switched between signatory simultaneously territory in two territories, just can possess the function of switching between the territory, the territory switch controller can judge whether to allow to switch to the purpose network according to CAMEL-Subscription-Information before implementing switching controls.If these two territories are same operator, need so in signatory, to specify some territories switch controller, if these two territories are different operators, must reach an agreement between these two operators so, and the function of specifying a common territory switch controller to realize switching between the territory.The user has comprised the address of this territory switch controller in the CAMEL-Subscription-Information in these two territories, this address can be different in two territories.

Present embodiment be implemented in two not the seamless handover method between the same area may further comprise the steps:

Step 1, first terminal 100 is initiated the calling to second terminal 140 from first territory, by calling signaling link and bearing link between 110 foundation of first territory and second terminal 140, in call establishment, set up the signaling contact 112 of first territory 110 and territory switch controller 150 simultaneously, territory switch controller 150 is preserved the call information in first terminal, 100 to first territories 110 and the call information of first territory, 110 to second terminals 140, and is associated by the number of first terminal 100;

As shown in Figure 1, first end constitutes by following three sections to the signaling link and the bearing link of second end: first terminal is to the signaling link 111 and the bearing link 180 in first territory, first territory is to the signaling link 113 and the bearing link 181 in called territory 130, and the signaling link 114 of the called territory and second terminal room and bearing link 182.If the called territory and first territory are same territories, bearing link 181 and 182 unifications, signaling

link

113 and 114 unifications so.

Step 2, first terminal 100 detect in the time of need switching to second territory 120, make a call from second territory 120, destination Mobile Station International ISDN Number is the number of territory switch controller 150 in this territory, be established to the signaling link 210 and the bearing link 250 in second territory 120, second territory 120 is set up according to destination Mobile Station International ISDN Number and the signaling of territory switch controller 150 gets in touch 211, and tell territory switch controller 150 with the number of first terminal 100, as shown in Figure 2;

Before terminal 100 makes a call from second territory, need elder generation sometimes from second territory, as the IMS territory, middle initiation location registration, enrollment process makes a call after finishing again.The territory that yet has does not need registration just can make a call, as UMTS CS territory.

Step 3, when territory switch controller 150 allows first terminal 100 to switch on inspection, the inter-domain call of indicating first territory 100 or second territory 120 to create between first territory and second territory, and according to the number of first terminal 100, related this terminal in first territory 110 to the calling of second terminal 140, inter-domain call and the new call of this terminal in second territory 120, exchange and consult the beared information of adjacent calling in case of necessity mutually, finally set up first terminal, 100 to second territories 120, again to first territory 110, again to the signaling link (210-213-113-114) and the bearing link (250-251-252-182) of second terminal 140, as shown in Figure 2;

Just need to consult when in fact having only the IP carrying.The circuit time slot that the TDM carrying needs only both sides connects just passable.After the negotiation, the carrying 252 to second terminal in first territory may be different with original carrying 181, but signaling link 113-114 is constant.The implementation that territory switch controller 150 is set up signaling between first territory 110 and second territory 120 and carrying is relevant with concrete territory, can be with reference to two examples hereinafter.

150 indications of step 4, territory switch controller discharge signaling link 111 and the bearing link 180 of first terminals 100 in first territory 110, but the territory switch controller does not discharge to the signaling contact 112 in first territory.Like this, first terminal 100 is just from first territory 110, switched to second territory 120, the call information of switch controller 150 in store first terminal 100 to second territories 120,120 to first territories 110, second territory and first territory, 110 to second terminals 140 between the territory is associated with the number of first terminal 100.

In the above-mentioned handoff procedure,, owing to be after new carrying foundation is finished, just disconnect original carrying, and be to disconnect the carrying that switches to second territory afterwards immediately, the therefore interruption of imperceptible business to first territory for first terminal.For second terminal, if the carrying to second terminal does not need to rebulid in first territory, can not feel that first terminal switches yet, disconnect if desired and rebulid according to negotiation result, may have the service disconnection of short time so.

Call out if first terminal has to exist between a plurality of terminals simultaneously, in the switch controller of territory, must be saved in the call information of all these terminals so.When first terminal was switched, the beared information in the call information of all these terminals all may need to consult again.

Please refer to Fig. 3, need to switch back in first territory, can realize by following steps if first terminal 100 detects:

Step 5, first terminal 100 detect need be when first territory 110 be switched go back in second territory 120, and notice territory switch controller 150 switches, and with the Subscriber Number of first terminal, and sets up the calling in first terminal, 100 to first territories 110;

First terminal 100 can utilize the signaling link 210,211 that has existed in second territory to notify, and after territory switch controller 150 is notified, will indication first territory 110 be established to the calling (called flow) of first terminal.Also can make a call from first territory 110, be destination Mobile Station International ISDN Number with the number of territory switch controller 150 in this territory, sets up first terminal, 100 to first territories 110, and calling and the notice to territory switch controller 150 needs to switch again.

Step 6, territory switch controller 150 are according to the number of first terminal 100, find present existence first territory, 110 to second terminals 140 calling and be associated with the calling in first terminal, 100 to first territories, between two callings, exchange mutually and negotiating bearer information in case of necessity, set up first terminal, 100 to first territories 110, again to the signaling link (311-113-114) and the bearing link (380-381-182) of second terminal 140;

Signaling link 213 and bearing link 251 between the territory in step 7, territory switch controller 150 indication release 120 to first territories 110, second territory, and the signaling link 210 and the bearing link 250 of second territory, 120 to first terminals 100, like this, first terminal 100 has just been switched go back to first territory 110 from second territory 120.

If in step 4 first terminal after first territory switches to second territory, first terminal detects needs follow-up the 3rd territory that switches to, realize by carrying out following steps so, prerequisite is: the territory switch controller of controlling preceding two territories can be controlled the calling in the 3rd territory, user mobile phone can insert the 3rd territory, the service switchover and be assigned to this territory switch controller of having contracted in this territory between the territory.

Step 5 ', first terminal detect to need follow-up when switching to the 3rd territory, make a call from the 3rd territory, destination Mobile Station International ISDN Number is the number of this territory switch controller in this territory, the signaling link and the bearing link in the 3rd territory played in foundation, the 3rd territory is set up according to destination Mobile Station International ISDN Number and the signaling of territory switch controller is got in touch, and tells the territory switch controller with the number of first terminal;

Step 6 ', the territory switch controller allows first terminal when first territory switches to the 3rd territory on inspection, indicate first territory or the 3rd territory to create inter-domain call between first territory and the 3rd territory, and according to the calling to second terminal in first territory of related this terminal of the number of first terminal, inter-domain call and the new call of this terminal in the 3rd territory, exchange and consult the beared information of adjacent calling in case of necessity mutually, set up first terminal to the, three territories, again to first territory, again to the signaling link and the bearing link of second terminal, wherein the carrying to second terminal may be revised to some extent in first territory, but signaling link is constant;

Step 7 ', territory switch controller indication discharges second territory to first terminal, second territory is to the signaling and the bearing link in first territory, but the contact of the signaling in territory switch controller and first territory do not discharge, such first terminal just switches in the 3rd territory.Above step and step 2, three, four are very similar.

In the above flow process,, do to carry out switching between the territory with said method equally when called though first terminal is to do caller.Be that changing method of the present invention is identical for calling and called, and be separate.

With two examples above-mentioned flow process is further detailed below.Relate to CS territory and IMS territory among the 3GPP in the example.These two territories are separate, and audio call can be provided.Can intercommunication between these two territories.

Fig. 4 A～Fig. 4 D is the networking diagram of two examples, only shows equipment component, and concrete network configuration can be referring to 3GPP TS 23.003.Fig. 5 and Fig. 6 show the flow process of two switchings.Being explained as follows of each network element among the figure:

UEA: to UEA require as follows: 1) bimodulus, can insert the IMS territory and UMTS CS territory is called out; 2) can detect and select a kind of access way automatically according to Carrier Requirements and user preferences or other standards; 3) when UE exists UMTS CS to call out, UE can initiate registration and session simultaneously in the IMS territory; 4) when there is the IMS session in UE, UE can initiate or receive UMTS CS simultaneously and call out.

Handle the function in CS territory among the UEA_cs:UEA.

Handle the function in IMS territory among the UEA_ims:UEA.

HOAS (Handover Application Server): the switch application server, promptly territory switch controller above mainly is responsible for the audio call switching in IMS territory and UMTS CS territory.HOAS basis routing mode separately in CS territory and IMS territory can both be routed to.And in UMTS CS territory, HOAS will be as Camel (Customised Application for Mobile network EnhancedLogic, the customization application of mobile network enhancing logic) SCP (the Service Control Point in, service control point), HOAS is then as AS (Application Server, application server) in the IMS territory.

CSCF (Call Server Control Function): call server controlled function in the IMS territory can be divided into P-CSCF (proxy CSCF) again, I-CSCF (inquiry CSCF) and S-CSCF (serving CSCF).

MGCF (Media Gateway Control Function): MGCF in the IMS territory, major control is to the intercommunication of legacy network.

MSC (Mobile Switching Centre): mobile switching centre, be responsible for professional control in the UMTS CS territory.

PSTN (Public Switched Telephone Network): PSTN.

The media gateway in IM-MGW:IMS territory;

UEB: terminal called in the calling, in the PSTN net.

Fig. 5 is that UEA calls out PSTN user UEB, and UEA switches to the flow chart in IMS territory and switchback CS territory from the CS territory, and step is described as follows:

At first, UEA is established to PSTN user's calling by UEA_cs, MSC.There is shown the radio bearer 450 of UEA_cs, and MSC is to TDM (time-divisionmultiplexing, time division multiplexing, promptly traditional signaling and the bearing link) carrying 451 of PSTN to MSC.Set up in the calling procedure, MSC is triggered to the Camel process of HOAS, sets up CAP (CAMEL Application Part, CAMEL Application Part) dialogue.Preserve the corresponding relation of UEA Subscriber Number and this CAP dialogue among the HOAS, preserve the dialogue Id that comprises the CAP dialogue, call informations such as MSC number are shown in Fig. 4 A.

Step 400～401:UEA finds that this CS calling need switch to the IMS territory, so UEA_ims at first initiates the registering flow path in IMS territory according to certain criterion.After registering successfully, UEA_ims sends to the IMS territory and sets up call request, and destination Mobile Station International ISDN Number is the number of HOAS in this territory, and comprises the Subscriber Number of UEA and the beared information of UEA.The number of HOAS in this territory can obtain in enrollment process, also can be by this locality configuration of UEA, and perhaps additive method obtains.Call request is routed to destination HOAS through the CSCF in IMS territory, preserves the beared information of UEA after HOAS receives, and makes index with the Subscriber Number of UEA.Can be configured to call out this specific HOAS and just represent to need to switch, perhaps allow HOAS judge whether it is the message that notice is switched by the information of carrying in certain message format or the message in IMS (or CS) territory;

Step 402:HOAS checks whether allow this user to switch to IMS (this inspection also can be carried out) from UMTS CS in HSS (Home Subscriber Server, home subscriber server).If allow to switch, the Subscriber Number according to UEA finds corresponding CAP dialogue so, and instruct MS C is established to the calling of HOAS then, comprises the number of HOAS in the IMS territory in this indication;

Step 403～404:MSC receives after the indication, find a suitable MGCF in the IMS territory, use the foundation of ISUP/TUP/BICC message to play the TDM carrying 453 of the IM-MGW of this MGCF control, MGCF sends to HOAS and sets up conversation request then, carries the beared information of MGCF and the Subscriber Number of UEA.After HOAS receives,, find the UEA beared information of preservation, and hold consultation (negotiations process is referring to 3GPP agreement TS 23.228), set up the IP carrying 452 of the IM-MGW of MGCF control to UEA with MGCF according to the Subscriber Number of UEA;

Step 405～406: after carrying 452 and 453 was set up and to be finished, HOAS was by CAP dialogue instruct MS C: with MSC＜=the TDM1 carrying 451 of UEB and MSC＜=the TDM2 carrying of the IM-MGW of MGCF control couples together; With MSC＜=the CS radio bearer of UEA_cs 450 discharges.

Like this, all set up by the carrying on the whole call chain in IMS territory: 452-453-451.Situation after the switching is shown in Fig. 4 B.Simultaneously, HOAS collects CS territory charge information by CAP, collects the charge information in IMS territory by Diameter (a kind of aaa protocol), and these two charge informations are associated.

Step 430～431: need to switch back CS if UEA judges, UEA_ims will send the notice request that requires switchback CS to HOAS by the session of having set up in the IMS territory so, and destination Mobile Station International ISDN Number is the number of HOAS in the IMS territory, the Subscriber Number of band UEA;

After step 432～433:HOAS receives, find that there has been the CAP dialogue of MSC in this terminal, but the not calling in the CS territory from MSC to UEA_cs, and then instruct MS C is established to the calling of UEA_cs.After MSC receives,, set up the CS radio bearer 454 between UEA_cs and the MSC by exhaling flow process the end in CS territory;

Step 434～435:MSC will send notice to HOAS after the call setup of UEA_cs, the HOAS indication will be carried 454 and 451 and be linked up;

Step 436～438:HOAS instruct MS C releasing bearing TDM2 453, indication MGCF discharges IP carrying 452, discharges corresponding signaling simultaneously.

Like this, CS has been switched back in calling again.

Fig. 5 is that dual-mode terminal UEA calls out PSTN user UEB, and UEA switches to the flow chart in CS territory and switchback IMS territory from the IMS territory, and step is described as follows:

At first, UEA_ims registers in the IMS territory.If contracted CS and IMS of user switches in HSS, so in enrollment process, be responsible for the number of HOAS in the IMS territory that CS/IMS switches and bring CSCF or UEA.CSCF and UEA also can obtain number in the IMS territory of HOAS by this locality configuration or other modes.Afterwards, UEA_ims is to the request of making a call of IMS territory, and destination Mobile Station International ISDN Number is the Subscriber Number of UEB, and the Subscriber Number of band UEA also may be with HOAS number in the IMS territory.This call request is routed to after the CSCF, and according to filtering rule (whether have the attribute of service switchover between signatory territory as checking this user, perhaps whether have the number of HOAS), this call request will be routed to is responsible for the HOAS that CS/IMS switches.After HOAS receives, preserve the Subscriber Number of UEA and the corresponding relation of this Session (affairs), initiate one then and exhale flow process, be established to UEB (PSTN user's) calling by MGCF1.Carrying is divided into two sections, and the IM-MGW of the IP of the IM-MGW of control carrying 550 and MGCF1 control is to the TDM carrying 551 of UEB from UEA to MGCF1.The call information in the IMS territory of preserving among the HOAS includes the beared information of the session ID that exhales and go out to exhale, two callings and to routing table of destination etc.Situation before switching is shown in Fig. 4 C.

Step 500～501:UEA finds that according to certain criterion this calling need switch to the CS territory, so UEA_cs makes a call from the CS territory, destination Mobile Station International ISDN Number is the number of HOAS in the IMS territory, is established to the CS radio bearer 552 of MSC;

Step 502～503: rise and to exhale that MSC triggers the Camel business according to destination Mobile Station International ISDN Number in the process, be established to the CAP dialogue 502 of HOAS, the Subscriber Number of band UEA (user's Camel data are inserted the MSC/VLR database from HLR) in user position update.After HOAS receives, check whether to allow to call out to switch to CS from IMS.If allow, then preserve the Subscriber Number of UEA and the corresponding relation of this CAP dialogue, instruct MS C sets up the calling from MSC to HOAS then, comprises the number of HOAS in the IMS territory in the indication;

Step 504～505:MSC receives after the indication, selects certain MGCF2, sets up the TDM carrying 553 between the IM-MGW of MSC and MGCF2 control.MGCF2 sends call request to HOAS then, the beared information of band MGCF2 and the Subscriber Number of UEA.After HOAS receives, preserve this beared information, find the Session in corresponding IMS territory according to the Subscriber Number of UEA, exchange and consult the beared information of MGCF1 and MGCF2 mutually then, the IP carrying 554 of setting up the IM-MGW of the IM-MGW of MGCF1 control and MGCF2 control.

Step 506～507: after carrying 553 and 554 was set up successfully, the HOAS indication discharged the IP carrying 550 and relevant signaling of the IM-MGW of MGCF1 control to UEA_ims.Like this, just set up following carrying: 552-553-554-551 between UEA_cs and the UEB, called out and be switched to the CS territory.Situation after the switching is shown in Fig. 4 D.

In this process, HOAS collects CS territory charge information by CAP, collects the charge information in IMS territory by Diameter, and these two charge informations are associated.

Step 530～531: when UEA detects need be when CS switches back IMS with audio call, at first initiate registration from IMS, UEA_ims is from the request of making a call of IMS territory then, destination Mobile Station International ISDN Number is the number of HOAS in the IMS territory, simultaneously with the Mobile Subscriber International ISDN Number of UEA with at the beared information in IMS territory.This call request is routed to HOAS according to the number of HOAS in the IMS territory;

Step 532～533:HOAS receives after the request, finds its session that arrives UEB according to the UEA Subscriber Number, exchanges mutually and negotiating bearer information with MGCF1 then, sets up IP carrying 555 after the success.Just set up carrying 555-551 like this between UEA_ims and the UEB from the IMS territory;

Step 534～536: carrying is after 555-551 sets up successfully, and HOAS finds corresponding CAP dialogue according to the Subscriber Number of UEA, notifies MSC to discharge the CS calling of MSC to the calling of HOAS and MSC to UEA-cs then, and release MSC talks with to the CAP of HOAS.

Like this, audio call has been switched go back to the IMS territory again.

Above-mentioned two examples have solved bimodulus (UMTS CS and IMS) mobile phone and carried out the problem that voice switch between UMTS CS territory and IMS territories.But the present invention is not limited to switch between these two territories, also is not limited to the switching of carrying out speech business.When between other territory, switching, when perhaps the structure in territory changes, calling control flow that above-mentioned flow process is involved and equipment, bearing mode and equipment thereof, and the foundation of signaling and carrying should change according to relevant criterion between the territory.But the present invention realizes that the basic process of seamless switching between the territory is still effective.

Claims

1, the method for switching between the territory in a kind of communication system may further comprise the steps:

(b) terminal A is initiated to the calling of other terminal from first territory, be established to the signaling link and the bearing link of other terminal by first territory, in call establishment, also set up the signaling contact of first territory and described territory switch controller, described territory switch controller preserve terminal A to first territory, first territory is to the call information of other terminal, be associated with the number of terminal A;

2, the method for claim 1 is characterized in that, described step (e1) back is further comprising the steps of:

3, the method for claim 1 is characterized in that, terminal A can also insert the 3rd territory, and the service switchover and be assigned to described territory switch controller of having contracted in this territory between the territory, and is further comprising the steps of in described step (e) back:

4, as claim 1,2 or 3 described methods, it is characterized in that, described two territories are meant universal mobile telecommunications system circuit commutative field and IMS domain, and described territory switch controller in described universal mobile telecommunications system circuit commutative field as service control point, in described IMS domain as application server.

As claim 1,2 or 3 described methods, it is characterized in that 5, described territory switch controller also is responsible for the charge information of collection terminal A in first territory and second territory, and the charge information in these two territories is associated.

6, method as claimed in claim 2, it is characterized in that in the described step (f), terminal A is by be initiated to the calling of described territory switch controller in first territory, perhaps utilize the signaling contact of arriving described territory switch controller in original second territory, notify described territory switch controller to switch.

7, as claim 1,2 or 3 described methods, it is characterized in that, when described territory switch controller couples together two sections callings,, also earlier exchange and consult the beared information of these two callings mutually the IP carrying.

8, the method for claim 1 is characterized in that, in the described step (c), when terminal A notifies described territory switch controller to switch, also carries the beared information of terminal A in second territory.

9, method as claimed in claim 4, it is characterized in that, in the described step (a), when terminal A is initiated to the calling of other terminal from described circuit commutative field, it is the customization application process that is triggered to the mobile network enhancing logic of described territory switch controller by first territory, set up the applying portion dialogue, realize what mutual signaling was got in touch.

10, method as claimed in claim 4, it is characterized in that, in the described step (a), when terminal A is initiated to the calling of other terminal from described IMS domain, call server controlled function in this territory is according to whether carrying the number of described territory switch controller in this territory in this calling, perhaps whether this user has the attribute of service switchover between signatory territory, determine whether routing the call to described territory switch controller, the number of described territory switch controller in IMS domain brings terminal A or call server controlled function by enrollment process, perhaps at terminal A or/and the local configuration of call server controlled function.

11, method as claimed in claim 4, it is characterized in that, in the described step (d), no matter terminal A need switch to IMS domain from the universal mobile telecommunications system circuit commutative field, perhaps opposite, described territory switch controller all is that the mobile switching centre of indication universal mobile telecommunications system circuit commutative field initiates cross-domain call, is destination Mobile Station International ISDN Number with described territory switch controller at the number of IMS domain.

12, the territory switch controller in a kind of communication system is characterized in that, comprises switching controls module, message processing module, wherein:

13, territory as claimed in claim 12 switch controller is characterized in that, also comprises information storage module, is used to preserve attribute of user data and business datum, comprises the whether attribute of service switchover between signatory territory of user, is used to judge whether allow to switch.

14, territory as claimed in claim 12 switch controller is characterized in that, also comprises accounting module, is used to collect the charge information in two territories and is associated with respective call.

15, territory as claimed in claim 12 switch controller is characterized in that described switching controls module also comprises the bearer negotiation unit, is used between two callings exchange and negotiating bearer information mutually.

16, a kind of communication system of switching between the territory realized, comprise terminal and first territory and second territory that can intercommunication, it is characterized in that, also comprise at least one territory switch controller, this territory switch controller basis routing mode separately in first and second territories can both be routed to

17, system as claimed in claim 16, it is characterized in that, described two territories are meant universal mobile telecommunications system circuit commutative field and IMS domain, and described territory switch controller in described universal mobile telecommunications system circuit commutative field as service control point, in described IMS domain as application server.