CN1225217A - Emergency call back for roaming mobile radio subscribers - Google Patents

Abstract

Whenever a mobile station originates an emergency call connection towards a Public Safety Answering Point (PSAP), a first mobile switching center (MSC) serving the mobile station assigns a first temporary local directory number (TLDN) to the call connection. The assigned TLDN is also utilized as the calling party number (CgPn). Subsequently, whenever the mobile station roams out of the first MSC coverage area, the data correlating the first TLDN with the Mobile Station Integrated Service Digital Network (MSISDN) number associated with the roaming mobile station are maintained by the first MSC if a timer assigned to the first TLDN has not expired. Alternatively, the first MSC may also communicate with the second MSC newly serving the mobile station to request and receive a second TLDN associated with the second MSC. Whenever the PSAP requests a call back connection in response to a disconnection of the original emergency call connection, the first MSC forwards the received call setup signal using the stored MSISDN or second TLDN as the new Called Party Number (CdPn).

Description

The emergency call back of roaming mobile radio subscribers

The present invention relates to U.S. Patent application No.08/651982, the applying date is on May 21st, 1996, and name is called " emergency call back that uses MSC number " (number of documents: No.27943/64).

The present invention relates to mobile telecom network, more particularly, relate to a kind of emergency call back that is used for realization from the mobile subscriber of public safety answering point (PSAP).

Emergency service office (ESB), or more generally be called 9-1-1 service in the U.S., provide emergency aid to the people of being badly in need of helping.The mobile subscriber of a searching emergency communication service only need dial the one number (such as being 911 in the U.S.) of a weak point, and just can setting up fast with one of public safety answering point (PSAP) terminal that the ESB service is provided, emergency call be connected.When the PSAP terminal is set up emergency call and is connected, the telephone number that interrelates with this travelling carriage to be sent to this PSAP usually.This PSAP utilizes the telephone number that sent or travelling carriage integrated service digital network number, and (Mobile Subscriber International ISDN Number also claims personal station integrated service telephone number-PSISDN), the person that comes the call identifying, and, when this connects disconnection, if desired, can be used to this mobile subscriber of callback.

When needs callback travelling carriage, can require to rebulid as soon as possible this calling and connect.Yet, realize the travelling carriage callback by utilizing the Mobile Subscriber International ISDN Number that receives, must send to the gateway mobile services switching centre (GMSC) that interrelates with destination Public Land Mobile Network (PLMN) with setting up request signal, must inquiry store the Home Location Register (HLR) of the user profile relevant, this must be set up request signal and be retransmitted to the specific mobile switching centre (MSC) that serves this travelling carriage with this travelling carriage.The inquiry and the retransmission process of this complexity have postponed call setup, and overslaugh ESB provide assistance fast and effectively to the travelling carriage of needs.And, if an interviewed PLMN can charge this callback for this travelling carriage service as the trunk call to this mobile subscriber.

Along with the development of PCS Personal Communications System (PCS) and global system for mobile communications (GSM), the notion of having quoted interim local telephone number (TLDN) alleviates above-mentioned problem.Each MSC and Visited Location Registor (VLR is usually located at the same position with MSC, and stack up is called MSC/VLR) comprise interim local telephonedirectory.Each TLDN is the cable phone number of the specific MSC/VLR of representative.When receiving emergency call from a travelling carriage and set up request, for selecting the available TLDN of the next one in specific travelling carriage this table, and send to PSAP as calling party's number (cgpn).Wish to set up under the situation that callback is connected at this PSAP, the TLDN that is received is used as this callee's number (cdpn) with this travelling carriage.Because the TLDN that is received is a cable phone number of distributing to this exhalation MSC, so the repeating transmission of not having the mobile system inquiry of local (home) HLR or setting up information need be carried out.Be connected but between PSAP and exhalation MSC, directly set up to call out.In case exhalation MSC has received the callback connection request, this exhalation MSC/VLR determines and the relevant MSISDN of this specific T LDN, and foundation is connected with the calling of suitable travelling carriage.And, because this calling PSAP and this exhalation MSC/VLR are usually located in the same PLMN, can not produce long-distance cost for this callback connection.

Although above-mentioned way has alleviated the problem of some emergency call backs, but still there is certain system constraint.Outside this travelling carriage moves to a MSC/VLR area of coverage and when roaming among the 2nd MSC/VLR area of coverage, the one MSC/VLR is according to the request of local HLR, by from its database, removing the relevant user profile that all belong to this mobile subscriber, cancel the registration of this travelling carriage.And the 2nd MSC/VLR communicate by letter with local (home) HLR, registers itself and this roaming relevant user profile that travelling carriage interrelates of meeting an urgent need.Yet, respond the disconnection that this emergency call connects, if the TLDN of representative the one MSC/VLR that this PSAP receives before using starts the emergency call back to this travelling carriage, this callback connects and will fail.Because a MSC/VLR no longer keeps the user profile relevant with this roaming mobile subscribers.Be connected no longer possibility with the emergency call back of this travelling carriage by MSC/VLR foundation.

Therefore, need a kind of mechanism, can make the callback of PSAP terminal shift out a MSC/VLR area of coverage and be roamed into the former travelling carriage of the 2nd MSC/VLR area of coverage.

The invention discloses a kind of method and apparatus, be used to respond the existing initial emergent disconnection that is connected between this mobile subscriber and this PSAP terminal, by public safety answering point (PSAP) terminal, callback mobile subscriber.When first mobile switching centre (MSC) reception of serving specific travelling carriage is organized the emergency call connection requests to this PSAP, replace the telephone number relevant with the interim local telephone number (TLDN) of distributing to a MSC, as in first caller rs number of setting up in the signal (cgpn) with this travelling carriage.The one MSC also stores the telephone number data relevant with distribution T LDN of representing this travelling carriage.Also stop timer and distribute to this specific TLDN one.Then, setting up first emergency call between this travelling carriage and this PSAP is connected.

Respond because this mobile roaming arrives another geographic area by the 2nd MSC service, a MSC need cancel the definite of this travelling carriage registration from its database, and a MSC determines the state of the timer of dispensing.If this timer does not also stop, then a MSC keeps this telephone number data relevant with the TLDN of distribution.Thereafter, if a MSC responds the disconnection that this first emergency call connects, the TLDN that receives the utilization distribution from this PSAP sets up the emergency call back connection requests as callee's number (cdpn), a telephone number relevant with TLDN this reception the MSC retrieve stored.Then, a MSC adopts the telephone number of retrieval to call back request as callee's number (cdpn).Afterwards, setting up callback between this PSAP and this roaming mobile stations is connected.

In another embodiment, when travelling carriage moved on to the 2nd MSC area of coverage, MSC request and reception were from the 2nd TLDN of the 2nd MSC.The 2nd TLDN also is a cable phone number of representing the 2nd MSC.Secondly, when from this PSAP reception emergency call back request, MSC retrieval and this receive the 2nd relevant TLDN of cdpn.Then, the 2nd TLDN with this retrieval directly sends the request to the 2nd MSC from a MSC as callee's number.Then, the 2nd MSC foundation is connected with the callback of this travelling carriage of the area of coverage that just roams in it.

By will more fully understanding method and apparatus of the present invention, wherein with reference to following detailed in conjunction with the accompanying drawings:

Fig. 1 is the block diagrams of a plurality of Public Land Mobile Networks of expression (PLMN) to the network interconnection of public switch telephone network (PSTN);

Fig. 2 is the block diagram that is illustrated in emergency call establishment of connection between travelling carriage and public safety answering point (PSAP) terminal;

Fig. 3 is that the expression travelling carriage is from the block diagram of first mobile switching centre (MSC) to the 2nd MSC roaming;

Fig. 4 is a flow chart, the step that PSAP terminal this roaming mobile stations of technology callback according to the present invention is taked by exhalation MSC;

Fig. 5 is that expression utilizes travelling carriage integrated service digital network (MSISDN) number of storage to set up the block diagram that this PSAP terminal is connected with callback between this roaming mobile stations;

Fig. 6 is the block diagram of expression from the communication of the new interim local telephone number (TLDN) of the 2nd MSC to the MSC;

Fig. 7 is that expression uses the TLDN that receives as callee's number, calls back the block diagram of the calling of request to the 2nd MSC from a MSC.

Fig. 1 is the block diagram of expression a plurality of public land mobile networks (PLMN) 10a-10b to the network interconnection of public switch telephone network (PSTN) 20.With travelling carriage 30 (also claiming portable terminal or equipment) with get in touch as one of PLMNs 10a of local plmn.At each PLMN10, in 10a, there is the 40a-40b of many different mobile switching centres (stack up is called MSC/VLR for MSC, common and Visited Location Registor same position) to serve geographic area by this network coverage.Each MSC/VLR40 communicates by letter with travelling carriage 30 through wireless channel 50.

At each PLMN10, in 10a, a GMSC (gateway mobile switching center) (GMSC) 80a is arranged, be used for predetermined incoming call to travelling carriage 30 is sent to suitable MSC/VLR40a.As shown in the figure, if this PLMN10a is the local plmn of travelling carriage 30, then will at first send to GSMC80a by the calling of one of local telephone office in the PSTN20 (LE) 70 starting through access tandem (AT) 60.Then, GSMC80a Home Location Register (HLR) 90a (this step is called the HLR inquiry later on) that will ask the signal of routing information to send to serve travelling carriage 30.HLR90a (its storing subscriber information and the tracking that keeps the current location of travelling carriage 30) turns back to GMSC80a with route instruction.This route instruction that is returned comprises and indicates the network address which MSC/VLR40 is currently serviced in travelling carriage 30.According to the reception of this routing information, GMSC80a sends incoming call to the MSC/VLR40a that is specified.Then should service MSC/VLR40a be connected by Radio Link 50 foundation callings with travelling carriage 30 in its MSC/VLR service area.

Between this HLR inquiry by GMSC80a is necessary, because travelling carriage 30 is not restricted to fixing circuit or geographical position.Because travelling carriage 30 can freely move to any one the MSC/VLR district among the given PLMN10, the MSC/VLR40 that serves this travelling carriage does not remain unchanged.When travelling carriage 30 moves to the different MSC/VLR areas of coverage, when maybe this unit being connected first, this service MSC/VLR40 upgrades processing with local HLR90 executing location, to notify the present position of local this travelling carriage of HLR90.As a result, no matter be which MSC/VLR is currently serviced in travelling carriage 30, local HLR90 maintains the positional information about travelling carriage 30.Thereafter, when GSMC80a inquired local HLR90, local HLR90 can both provide the network address of the MSC/VLR40 that serves travelling carriage 30 now.This positional information that utilization receives from local HLR90, GSMC80a sends incoming call to appointed MSC/VLR40.

Fig. 2 is illustrated between travelling carriage 30 and the public safety answering point (PSAP) 110 to set up the block diagram that emergency call is connected.Emergency service office (ESB) or be called 9-1-1 service in the U.S. provides emergency service to the people of being badly in need of help more commonly.In order to reduce people's effort, a mobile subscriber seek emergency service only need dial a short one number (such as the U.S. 911), be connected with the emergency call of request with a public safety answering point (PSAP) that provides ESB to serve.Signal with the request emergency call connects such as setting up signal based on the emergency call of direct transmission application protocol (DTAP), is sent by the dedicated channel of travelling carriage 30 through Radio Link 50.MSC/VLR10 in service PLMN10 sets up signal through the emergency call that base station (Bs) 100 receives this transmission.Then, service MSC/VLR40 determines that this is an emergency call connection requests, and concurrent SCN Space Cable Network is set up request signal 150, such as initial address message (IAM), gives PSAP110.PSAP110 receives this and sets up request signal 150, and connects between in travelling carriage 30 and available PSAP terminal 120a-120n one.

The IAM signal 150 of this transmission comprises caller rs number (cgpn) and callee's number (cdpn) parameter.Analyze this cdpn parameter by communication network, send the intended destination node of signal, utilize this cgpn parameter callback or inverse signal to give origination node by this destination node thereafter to determine this.As shown in the figure, comprise the MSISDN value of distributing to travelling carriage 30 from MSC/VLR40 to the cgpn parameter of an IAM information 150 (1) of PSAP transmission.Utilize an IAM information 150 (1), set up first between in travelling carriage 30 and the PSAP terminal 120 that is connected to PSAP110 and call out and be connected.First calling out and is connected under the situation about being disconnected between PSAP terminal 120 and travelling carriage 30, PSAP110 start callback request, so that be connected with travelling carriage 30 foundation callings by sending the 2nd IAM signal 150 (2).The MSISDN value in the cgpn parameter of an IAM signal 150 (1) that receives is used as the cdpn of the 2nd IAM signal 150 (2).Because the Mobile Subscriber International ISDN Number of this reception is a Mobile Directory Number, be connected in order to set up to call out with travelling carriage 30, need be by GMSC80a (not shown in Fig. 2).Carry out the inquiry of local HLR90 and the repeating transmission of call setup information in the mode described in Fig. 1.Yet when setting up emergency call and connect, it is undesirable postponing the program that PSAP110 is connected with calling between the travelling carriage 30.

Along with the development of PCS, quoted the notion of interim local telephone number (TLDN), alleviated the problems referred to above a little.When exhalation MSC/VLR40 when travelling carriage 30 receives emergency calls and sets up signal, will select from the next available cable phone number of TLDN table 130 and be used for that specific travelling carriage 30.And a timer that is preset in predetermined period of time distributed to that specific TLDN.For example, one 45 minutes timer is distributed to that specific TLDN.Register (R) 140 in service MSC/VLR40 is also relevant with the MSISDN that interrelates with travelling carriage 30 with selected TLDN.Then, when sending an IAM signal 150 (1) when setting up travelling carriage 30 and first emergency call between the PSAP terminal 120 is connected, selected TLDN is sent to PSAP110 as cgpn.Keep the TLDN MSISDN relevant of distribution by service MSC/VLR40, up to the timer termination of this distribution with quilt.After this timer stops, discharge the TLDN that distributes, make it can be used for other emergency call connection.

Be connected between two sides at this first emergency call and be disconnected, PSAP110 wants under the situation of callback travelling carriage 30, and the TLDN that receives is sent as the cdpn of the 2nd IAM signal 150 (2).Receiving the 2nd IAM signal 150 (2) afterwards, if this timer also stops, service MSC/VLR40 retrieval and the relevant MSISDN of TLDN from register (R) 140 receptions, and set up callback with travelling carriage 30 and be connected.Therefore,, can avoid above-mentioned input mobile calls creation facilities program (CFP), and the new calling that can directly set up between two sides connects by utilizing the TLDN of the reception of representing wired address.

In mobile communication system, handle the delay that incoming call causes although above-mentioned way has alleviated, but still have some undesirable system constraint.Now referring to Fig. 3, its represents travelling carriage 30 roaming from a MSC/VLR40 (1) to the 2nd MSC/VLR40 (2).When being served by a MSC/VLR40 (1), travelling carriage 30 starting emergency calls connect 160.Utilize the TLDN relevant as cgpn, set up calling connection from travelling carriage 30 to PSAP110 with that specific MSC/VLR40 (1).If travelling carriage 30 roamed into first geographic area by 2MSC/VLR40 (2) service afterwards, then shown in signal link 180, a MSC/VLR40 (1) should call out connection 160 and transfer 2MSC/VLR40 (2) to.Transferred 2MSC/VLR40 (2) to afterwards successfully should calling out to connect, and to connect 180 and 160 and between travelling carriage 30 and PSAP100, set up voice and connect through calling out.The one MSC/VLR40 (1) will be retained in this calling connection and be connected with PSAP100 as one " anchor formula switch " (" anchorswitch ") and with the 2nd MSC/VLR40 (2).If travelling carriage 30 enters on-hook subsequently, then will call out connection 180 and 160 and disconnect.The 2nd MSC/VLR40 (2) carries out with the position of local HLR90 and upgrades then, so that give local HLR90 with the nearest position informing of travelling carriage 30.The data that local HLR90 upgrades it to be being reflected in the locational variation of travelling carriage, and submit necessary information to new MSC/VLR40 (2).Local HLR90 also orders a MSC/VLR40 (1), eliminates position (Cancel Location) signal by sending, and removes the registration about the user record of travelling carriage 30.Then, a MSC/VLR40 (1) no longer provides service to travelling carriage 30, unless travelling carriage 30 is roamed back a MSC/VLR area of coverage.

Yet the response emergency call connects 160 disconnection, if the TLDN that PSAP110 attempts to use reception as cdpn callback travelling carriage 30, this callback attempt will be failed.The TLDN that is received by this PSAP is a cable phone number of representing a MSC/VLR40 (1).If send and to set up request signal as the callback of cdpn with that specific TLDN, then as this cdpn indicated this call setup request signal is sent to a MSC/VLR40 (1).Because travelling carriage 30 has been roamed out a MSC/VLR area of coverage, and a MSC/VLR40 (1) will remove from its database about all user profile of travelling carriage 30, set up request so a MSC/VLR40 (1) can not handle the callback of reception.And, because PSAP110 does not know the MSISDN that interrelates with roaming mobile stations 30, so this PSAP110 callback travelling carriage 30 directly.

Implemented another example of the system constraint that causes by common TLDN, travelling carriage 30 initiations are connected 160 with termination with the emergency call of PSAP110.Even this emergency call connect end after, a MSC/VLR still keeps the TLDN data relevant with the MSISDN that interrelates with travelling carriage 30 of distributing previously, up to this timer termination.Before this timer stopped, travelling carriage 30 roamed into the 2nd MSC/VLR area of coverage with idle mode.The 2nd MSC/VLR40 (2) detects the appearance of roaming mobile stations 30 in its area of coverage, and update service is in the Home Location Register 90 of travelling carriage 30 shown in signal link 190.After receiving new MSC/VLR address and this location of mobile station from the 2nd MSC/VLR40 (2), local HLR90 notifies a MSC/VLR40 (1), cancels the registration of travelling carriage 30 shown in signal link 200.As a result, detect all user profile that interrelate with travelling carriage 30 in its database of a MSC/VLR40 (1) the TLDN related data of from be included in register (R) 140 (1), storing.So, in the above described manner, if PSAP110 asks to be connected with the callback of travelling carriage 30 to a MSC/VLR40 (1) before the timer of regulation stops, then a MSC/VLR40 (1) can not handle this request.

Therefore, need a kind of mechanism, can make the PSAP callback shift out Anchor MSC/VLR area of coverage and also roam the roaming mobile stations that enters the different MSC/VLR areas of coverage.

Fig. 4 enumerates technology according to the present invention to make this this roaming mobile stations of PSAP terminal callback, by the flow chart of the service step that MSC taked.The one MSC/VLR receives emergency call connection request (step 210) from travelling carriage.Connect under the situation about disconnecting for ease of direct callback the one MSC/VLR retrieval next available TLDN (step 220) and as its TLDN that caller rs number (cgpn) in the signal sends this retrieval that sets up from its TLDN table in former calling.This signal of setting up is included in the initial address message that the request call that sends on Integrated Service Digital Network(ISDN) User Part (ISUP) signal link connects.At this moment, the timer that also will be used for predetermined period of time is distributed to the TLDN of this retrieval.Because each MSC/VLR includes limited number TLDNs, it is the TLDN that discharges this distribution after timer stops that TLDN is specified the purpose of timer, makes the same number of emergency call utilization subsequently.

As a result, in step 230, set up this travelling carriage and be connected with emergency call between this PSAP.Thereafter, the definite user profile relevant with this travelling carriage of a MSC/VLR need be deleted (step 240) from its database.Described in Fig. 3, when this travelling carriage is roamed out a MSC/VLR area of coverage and roamed the 2nd MSC/VLR area of coverage, do this kind and determine.If travelling carriage is roamed into the 2nd MSC/VLR district with idle mode, then Home Location Register order the one MSC/VLR that interrelates with this travelling carriage cancels the registration of this travelling carriage by sending delete position (CancelLocation) signal.If this travelling carriage is roamed into the 2nd MSC/VLR district (to be connected with the speech of this PSAP) in busy mode, then local HLR orders a MSC/VLR, when existing calling connection disconnection is upgraded by the new position of 2MSC/VLR execution, cancel the registration of this travelling carriage.Then, a MSC/VLR determines whether the timer that is assigned to the specific TLDN relevant with this travelling carriage has stopped (step 250).What the response timer stopped determines that a MSC/VLR removes this user profile and cancels the registration (260) of this travelling carriage from its database.

On the other hand, if the timer of appointment remains effectively, then a MSC/VLR keeps the TLDN data (step 280) relevant with the MSISDN that links with this roaming mobile stations of this appointment.Characteristic variable in the register (R) is set to represent that the travelling carriage that interrelates with this MSISDN has shifted out a MSC/VLR area of coverage (step 290).And all other user profile relevant with this travelling carriage can be deleted from its database.In step 300, carry out remaining in common mode and cancel registration procedure.By do not delete the relevant data of MSISDN quantity that interrelate with the TLDN of appointment from register (R), a MSC/VLR can handle the callback connection request that receives from PSAP thereafter.

Therefore, Fig. 5 is illustrated between PSAP terminal 110 and this roaming mobile stations 30 to set up the block diagram that callback is connected, and it has adopted the related data that keeps as shown in Figure 4.This PSAP110 responds the disconnection that former calling connects, and request is connected with the callback of travelling carriage 30 as cdpn to use the TLDN that receives previously.Because the TLDN that is received represents the cable phone number of a MSC/VLR40 (1), so this callback connection requests can be sent to a MSC/VLR40 (1).Although a MSC/VLR40 (1) no longer provides the service of moving to travelling carriage 30.Because the result of the program described in Fig. 4, a MSC/VLR40 (1) still keeps the TLDN of this reception data relevant with the MSISDN that interrelates with travelling carriage 30.Therefore, application module 340 retrieves characteristic variable (F) 310 from register (R) 140 (1), to determine to roam out a MSC/VLR area of coverage with the travelling carriage that the MSISDN330 that stores interrelates.Then, a MSC/VLR40 (1) utilizes the MSISDN that receives to send the request that is received as new cdpn, such as IAM.Because represented MSISDN is the mobile number of unique representative travelling carriage 30, so at first this request signal is sent to the GMSC (signal link) that interrelates with local HLR90.Then, GMSC80a inquires the information (signal link 360) of local HLR90 about sending.Local HLR90 is by the nearest customer position information of retrieval from its register 1 (R1) 95, further from serving the 2nd MSC/VLR40 (2) the request roaming number (signal link 370) of travelling carriage 30 now.The 2nd MSC/VLR40 (2) supplies back to give local HLR90 with roaming number.Local HLR90 returns this roaming number again and gives GMSC80a.Utilize the roaming number of the network address of expression the 2nd MSC/VLR40 (2) that receives, will be used to set up callback connection requests signal and send to the 2nd MSC/VLR40 (2) (signal link 380) from GMSC80a.The 2nd MSC/VLR40 (2) is connected by setting up Radio Link 50 with the travelling carriage of roaming 30 in its area of coverage, providing with the callback of PSAP110 then.As a result, even a MSC/VLR40 (1) no longer serves travelling carriage 30, received callback request after,, still can between PSAP110 and travelling carriage 30, set up callback and be connected to the 2nd MSC/VLR by the information that keeps being correlated with and the request that sends.

As another embodiment of the present invention, Fig. 6 represents the communication of the new TCDN from the 2MSC/VLR40 (2) that receives this roaming mobile stations 30 to a MSC/VLR40 (1) who shifts roaming mobile stations 30.Being engaged in when being connected, if travelling carriage 30 has shifted out a MSC/VLR area of coverage and entered the 2MSC/VLR area of coverage with the calling of PSAP110.With the base station controller (BSC, not shown) that a MSC/VLR40 (1) interrelates, will transfer needs information to send to a MSC/VLR with the target cell sign.The one MSC/VLR determines that this target cell belongs to the 2nd MSC/VLR40 (2) and also asks should call out to connect to hand over to the 2nd MSC/VLR40 (2).When request handed over to 2MSC/VLR40 (2), according to technology of the present invention, a MSC/VLR40 (1) also asked a TLDNs who interrelates with 2MSC/VLR40 (2) (signal link 400).Respond such request, the 2nd MSC/VLR40 (2) retrieves next available TLDN and it is sent back to a MSC/VLR40 (1) (signal link 410) from its TLDN table.By utilizing existing transfer signal (prepare-Handover and prepare-HandoverACK), or, can finish this communication by reference based on the signal of new mobile application part spare (MAP).2MSC/VLR40 (2) also stores the TLDN data relevant with the MSISDN that interrelates with roaming mobile stations 30 of this transmission.When after the 2nd MSC/VLR40 (2) receives new TLDN.The one MSC/VLR40 (1) is updated in the related data in the register (R) 140 (1), so that the TLDN that receives is relevant with the TLDN that a same MSC/VLR40 (1) of front appointment interrelates.As a result, the MSISDN that is stored in the register (R) 140 (1) is rewritten by the TLDN of the reception that interrelates with the 2nd MSC/VLR40 (2).Characteristic variable 310 in register (R) 140 (1) also is updated, and has roamed out a MSC/VLR service area with expression and this travelling carriage that the MSISDN that stores interrelates.

Represent as the another kind of cancelling the registration of travelling carriage 30 by a MSC/VLR40 (1), be connected with the former calling of PSAP110 disconnect after, travelling carriage 30 is roamed into the 2nd MSC/VLR district (comprise leave a MSC/VLR district open the lasting very first time of this travelling carriage afterwards in the 2MSC/VLR district) with idle mode.2MSC/VLR40 (2) detects the appearance of this travelling carriage and from the request of a MSC/VLR40 (1), the system parameters that some is necessary in the authentication program of this travelling carriage.According to technology of the present invention, in inverse signal 400, a MSC/VLR40 (1) places an indication, asks 2MSC/VLR40 (2) to specify and send new TLDN to return to a MSC/VLR40 (1).According to the indication that is included in this inverse signal, the next available TLDN of 2MSC/VLR40 (2) retrieval, and the TLDN420 that will have the retrieval of Mobile Subscriber International ISDN Number 330 is stored in its register, and through another MAP signal 410 TLDN of retrieval sent to a MSC/VLR40 (1).When receiving new TLDN, a MSC/VLR40 (1) upgrades related data, so that the TLDN that will newly receive is relevant with the TLDN of front appointment.Then, 2MSC/VLR40 (2) upgrades (signal link 190) with the local HLR90 executing location that interrelates with travelling carriage 30.After the user profile that necessity is provided to 2MSC/VLR40 (2), local HLR90 notifies a MSC/VLR40 (1), and the MAP signal of utilization such as Cancel-Location is cancelled the registration that this roams out travelling carriage 30 in the above described manner from its database.Because the timer of appointment is still effective, a MSC/VLR40 (1) keeps this user record with new reception TLDN ground.

Therefore, before the timer of appointment stops, when travelling carriage 30 leaves a MSC/VLR area of coverage, on behalf of the TLDN of the 2nd MSC/VLR40 (2), a MSC/VLR40 (1) will remain in the register (R) 140 (1).

Fig. 7 is that expression uses the 2TLDN that stores as cdpn, calls back the block diagram of the calling of request to the 2nd MSC/VLR40 (2) from a MSC/VLR40 (1).When PSAP110 responds disconnection request that former calling connects and is connected with the callback of travelling carriage 30, the cgpn parameter that receives previously is used as the cdpn parameter of this callback request signal.Because the cgpn that receives comprises the TLDN that interrelates with a MSC/VLR40 (1),,, send to a MSC/VLR40 (1) such as IAM with this callback request signal.Even a MSC/VLR40 (1) no longer is travelling carriage 30 services, according to technology of the present invention, a MSC/VLR40 (1) still keeps TLDN that receives and the relevant data of new TLDN that interrelate with the 2nd MSC/VLR40 (2).Application module 340 (1) in a MSC/VLR40 (1) is by estimating that characteristic variable 310 definite travelling carriages 30 that interrelate with the TLDN that newly receive are not at a MSC/VLR area of coverage.Retrieve the new TLDN420 that interrelates with the TLDN320 that receives afterwards application module 340 (1) the registers (R) 140 (1), and send the IAM signal as new cdpn with the TLDN420 of retrieval from it.Because new TLDN420 represents the cable phone number that interrelates with the 2nd MSC/VLR40 (2), this callback request signal directly can be sent to 2MSC/VLR40 (2) and need not to carry out mobile calls router (that is HLR inquiry) from a MSC/VLR40 (1).After 2MSC/VLR40 (2) receives the IAM signal of retransmitting, application module 340 (2) in the 2nd MSC/VLR40 (2) is with its register (R) 140 (2) of TLDN420 index that receives, with the relevant MSISDN330 that retrieves and travelling carriage 30 interrelates.After retrieval MSISDN330 from its register, 2MSC/VLR40 (2) determines the exact position of roaming mobile stations 30.After notice travelling carriage 30 incoming calls, thereby between travelling carriage 30 and PSAP110, set up callback and be connected.

Although accompanying drawing and above detailed description in the most preferred embodiment of apparatus and method of the present invention has been described, will be appreciated that the present invention is not limited to the disclosed embodiments, many reconfiguring can be arranged, revise and replace, and can not break away from by the spirit of the present invention defined in the claim of back.

Claims (28)

1. set up the method that emergency call is connected having between the travelling carriage of identification number (MS) and the telecommunication terminal (TT) for one kind, described method comprises step:

Receive first signal in first mobile switching centre (MSC), send described first signal by described MS and also ask to be connected with the emergency call of described TT;

To distribute to described travelling carriage with first cable phone number that a described MSC interrelates;

One specific timer is set to a preset value, and first cable phone number of described specific timer and described distribution is connected;

Store described specific timer first data relevant with described identification number with its first cable phone number that interrelates;

Adopting described first cable phone number to set up described MS as caller rs number (cgpn) is connected with emergency call between the described TT;

Determine that a described MSC need cancel the registration of described MS because described MS roams in another geographic area of being served by 2MSC;

Whether the described preset value that is defined as described specific timer setting stops; With

According to determining that described timer does not also stop, keep described first wired electric number and relevant described first data of described identification number of representing described travelling carriage.

2. according to the process of claim 1 wherein that described TT comprises a public safety answering point (PSAP) terminal.

3. according to the process of claim 1 wherein that described identification number comprises a travelling carriage integrated service digital network (MSISDN) number.

4. according to the process of claim 1 wherein that described first cable phone number comprises interim local telephone number (TLDN).

5. according to the method for claim 1, respond the failure that described emergency call is connected between described MS and the described TT, also comprise step:

Receive the 2nd signal at a described MSC, described the 2nd signal uses described first cable phone number to be connected with callback between the described TT as the described MS of callee's number (cdpn) request;

Definite described identification number that interrelates with described first cable phone number;

Determine whether still to serve the described MS that interrelates with described definite identification number by a described MSC; With

No longer by determining that a described MSC serves, send the described secondary signal of using described definite identification number to ask described callback to connect according to described MS as described cdpn; Otherwise

Be connected with the described callback of described MS by described MSC foundation.

6. according to the method for claim 5, keep the described step of described first data also to comprise step:

By the request of described MSC transmission for the 2nd cable phone number that interrelates with described 2MSC;

Response is for the reception of the described request of described the 2nd cable phone number:

By described 2MSC is that described MS specifies described the 2nd cable phone number;

Store described identification number 2nd data relevant with described the 2nd cable phone number; With

The cable phone number that is distributed is sent back to a described MSC; With

Response is upgraded described first data, so that described first cable phone number is relevant with the 2nd cable phone number of described reception by the reception of described the 2nd cable phone number of described MSC transmission.

7. according to the method for claim 6, the described step that wherein sends described the 2nd signal also comprises step:

Adopt described second cable phone number to send described secondary signal to described 2MSC as described cdpn;

Response is determined and the relevant described identification number of described reception second cable phone number by the reception of described the 2nd signal of described 2MSC; With

Set up with the described callback of the described MS that interrelates with described definite identification number by described 2MSC and to be connected.

8. according to the method for claim 6, wherein said the 2nd telephone number comprises interim local telephone number (TLDN).

9. according to the method for claim 5, wherein said secondary signal comprises initial address message (IAM) signal that is used for request call foundation.

10. according to the process of claim 1 wherein that the step that described definite described MSC needs are cancelled described MS registration comprises the step that receives elimination position signalling (200) from the Home Location Register (HLR) of serving described MS.

11. one kind is used for setting up the system that emergency call is connected having between the travelling carriage of identification number (MS) and the telecommunication terminal (TT), described system comprises:

Be used for receiving the device of first signal in first mobile switching centre (MSC); Sending described first signal by described MS also asks to be connected with the emergency call of described TT;

Be used for to distribute to the device of described travelling carriage with first cable phone number that a described MSC interrelates;

Be used for device that specific timer is set to a preset value and first cable phone number of described specific timer and described distribution is interrelated;

The device of first data that first cable phone number that is used to store described specific timer and interrelates is relevant with described identification number;

Be used to utilize described first cable phone number to set up the device that emergency call is connected between described MS and the described TT as caller rs number (cgpn);

Be roamed into result according to described MS, determine that a described MSC need cancel the device of the registration of described MS by another geographic area of 2MSC service;

Be used to be defined as the device whether described preset value of described specific timer setting has stopped; With

Be used to respond definite that described timer stops not yet, keep the device of described first cable phone number data relevant with the described identification number of the described travelling carriage of representative.

12. according to the system of right claim 11, wherein said TT comprises public safety answering point (PSAP) terminal.

13. according to the system of claim 11, wherein said identification number comprises travelling carriage integrated service digital network (MSISDN) number.

14. according to the system of claim 11, wherein said first cable phone number comprises interim local telephone number (TLDN).

15. according to the system of claim 11, respond the failure that described emergency call is connected between described MS and the described TT, also comprise:

Be used for receiving at a described MSC device of described the 2nd signal, described the 2nd signal adopts described first cable phone number to be connected with callback between the described TT at described MS as callee's number (cdpn) request;

Be used for device definite and the described identification number that described first cable phone number interrelates;

Be used for determining that the described MS that interrelates with described definite identification number is whether still by the device of described MSC service;

Respond described MS no longer by determining that a described MSC serves, adopt described definite identification number, the device of described the 2nd signal of the described callback connection of the request that sends as described cdpn; Otherwise

Set up the device that is connected with the described callback of described MS by a described MSC;

16., wherein be used to keep the described device of described first data also to comprise according to the system of claim 15:

The device that is used for the 2nd cable phone number that interrelates by described MSC request and described 2MSC;

The reception of the described request of described the 2nd cable phone number of response request:

By described 2MSC is the device that described MS distributes described the 2nd cable phone number;

Store the device of described identification number 2nd data relevant with described the 2nd cable phone number; With

Be used for the 2nd cable phone number of described distribution is sent back to the device of a described MSC; With

Response is upgraded described first data by the reception of a described MSC to second cable phone number of described transmission, so that the device that described first cable phone number is relevant with the 2nd cable phone number of described reception;

17. according to the system of claim 16, the described device that wherein is used to send described the 2nd signal also comprises:

Adopt described the 2nd cable phone number described the 2nd signal to be sent to the device of described 2MSC as described cdpn;

Respond the reception of described 2MSC, determine the device of the described identification number relevant with the 2nd cable phone number of described reception to described the 2nd signal; With

Set up the device that is connected with the described callback of the described MS that interrelates with described definite identification number by described 2MSC.

18. according to the system of claim 16, wherein said the 2nd cable phone number comprises temporary transient local telephone number (TLDN).

19. according to the system of claim 15, wherein said the 2nd signal comprises initial address message (IAM) signal that is used for request call foundation.

20. according to the system of claim 11, the described device that a wherein definite described MSC need cancel the registration of described MS comprises: be used for receiving the device of eliminating position signalling from the Home Location Register (HLR) of serving described MS.

21. between travelling carriage (MS) and telecommunication terminal TT, set up the method that callback is connected for one kind, wherein said MS, utilize first cable phone number that interrelates with first mobile switching centre (MSC) that serves described MS as caller rs number (cgpn), originally organize one to be connected with the calling of described TT, described first cable phone number has been distributed to the timer that is used for determining cycle termination time by a described MSC, a wherein said MSC also stores described first cable phone number and identification number relevant first data of described timer with the described MS of representative, and described method comprises step:

Response moves on to by the result in another geographic area of 2MSC service according to described MS determines that described MSC needs cancel the determining of registration of described MS:

Determine whether the described timer relevant with described first cable phone number that interrelates with described MS stops;

Respond definite that described timer does not also stop, keep relevant described first data of described identification number of described first cable phone number and the described MS of representative; With the disconnection that is connected according to described calling, receive request by a described MSC, connect with the callback of setting up from described TT to described MS, adopt the described request of described first cable phone number as callee's number (cdpn); With

The described identification number that first cable phone number of employing and described reception interrelates sends described request as described cdpn by a described MSC.

22. according to the method for claim 21, wherein said TT comprises public safety answering point (PSAP) terminal.

23. according to the method for claim 21, wherein said identification number comprises travelling carriage integrated service digital network (MSISDN) number.

24. according to the method for claim 21, wherein said first cable phone number comprises interim local telephone number (TLDN).

25. according to the method for claim 21, the step of described first data of wherein said maintenance also comprises step:

By the request of described MSC transmission for second cable phone number that interrelates with described 2MSC;

Respond the reception of described 2MSC for the described request of described the 2nd cable phone number:

By described 2MSC is that described MS distributes described the 2nd cable phone number;

Store described identification number 2nd data relevant with described the 2nd cable phone number; With

Second cable phone number of described distribution is sent back to a described MSC; And

Respond the reception of a described MSC, upgrade described first data, so that make described first cable phone number relevant with the 2nd cable phone number of described reception to the 2nd cable phone number of described transmission.

26. according to the method for claim 25, the step of wherein said transmission described request also comprises step:

Adopt described second cable phone number to send described request to described 2MSC as described cdpn;

Respond the reception of described the 2nd MSC, determine the described identification number relevant with second cable phone number of described reception to described request; With

Set up with the described callback of the described MS that interrelates with described definite identification number and be connected.

27. according to the method for claim 25, wherein said second cable phone number comprises interim local telephone number (TLDN).

28. according to the method for claim 21, wherein said request comprises initial address message (IAM) signal that is used for request call foundation.

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