WO1997044945A2 - Emergency call back for roaming mobile radio subscribers - Google Patents
Emergency call back for roaming mobile radio subscribers Download PDFInfo
- Publication number
- WO1997044945A2 WO1997044945A2 PCT/US1997/009257 US9709257W WO9744945A2 WO 1997044945 A2 WO1997044945 A2 WO 1997044945A2 US 9709257 W US9709257 W US 9709257W WO 9744945 A2 WO9744945 A2 WO 9744945A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- msc
- directory number
- mobile station
- wireline
- wireline directory
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/50—Connection management for emergency connections
Definitions
- the present invention relates to a mobile telecommunications network and, in particular, to a system for implementing emergency call back of a mobile subscriber from a Public Safety Answering Point (PSAP) .
- PSAP Public Safety Answering Point
- the Emergency Service Bureau or more commonly known in the United States as 9-1-1 service provides emergency assistance to a person in dire need of help.
- a mobile subscriber seeking emergency service merely has to dial a short unique number (such as 911 in the U.S.) to establish a fast emergency call connection with one of the Public Safety Answering Point (PSAP) terminals providing the ESB service.
- PSAP Public Safety Answering Point
- the directory number associated with the mobile station is conventionally transmitted to the PSAP.
- the transmitted directory number or Mobile Station Integrated Service Digital Network number (MSISDN number, also known as Personal Station Integrated Service Directory Number - PSISDN) is utilized by the PSAP to identify the caller and is also available, if needed, to call back the mobile subscriber if the connection is disconnected.
- MSISDN number Mobile Station Integrated Service Digital Network number
- GMSC Gateway Mobile Switching Center
- HLR home location register
- MSC mobile switching center
- Each MSC and visitor location register contains a list of temporary local directory numbers.
- Each TLDN is a wireline directory number representing that particular MSC/VLR.
- CgPn Calling Party Number
- the PSAP wishes to establish a call back connection with the mobile station, the received TLDN is used as the Called Party Number (CdPn) .
- the serving MSC/VLR determines the MSISDN correlated with this particular TLDN and establishes a call connection with the appropriate mobile station. Furthermore, since the serving PSAP and the serving MSC/VLR are usually located within the same PLMN, long distance charges are not incurred for the call back connection.
- the first MSC/VLR In case the mobile station travels out of the first MSC/VLR coverage area and roams into a second MSC/VLR coverage area, the first MSC/VLR, pursuant to the home HLR's request, de-registers the mobile subscriber by removing all relevant subscriber information pertaining to the mobile subscriber from its database. The second MSC/VLR instead communicates with the home HLR to register the relevant subscriber information associated with the roaming emergency mobile station.
- the PSAP initiates an emergency call back towards the mobile station using the previously received TLDN representing the first MSC/VLR, the call back connection fails. Since the first MSC/VLR no longer retains subscriber information associated with the roaming mobile subscriber, the establishment of the emergency call back connection with the mobile station by the first MSC/VLR is no longer possible.
- the present invention discloses a method and apparatus for calling back a mobile subscriber by a Public Safety Answering Point (PSAP) terminal in response to a disconnection of an initial emergency connection that existed between the mobile subscriber and the PSAP terminal.
- PSAP Public Safety Answering Point
- a first mobile switching center (MSC) serving a particular mobile station receives a request to originate an emergency call connection towards the PSAP, the directory number associated with the mobile station is replaced with a temporary local directory number (TLDN) assigned to the first MSC as the Calling Party Number
- the first MSC further stores data correlating the directory number representing the mobile station with the assigned TLDN. An expiration timer is also assigned to that particular TLDN. The first emergency call connection is then established between the mobile station and the PSAP.
- the first MSC determines the status of the assigned timer. If the timer has not yet expired, the first MSC retains the data correlating the directory number with the assigned TLDN. Subsequently, if the first MSC, in response to a disconnection of the first emergency call connection, receives a request to establish an emergency call back connection from the PSAP terminal utilizing the assigned TLDN as the Called Party Number (CdPn) , the first MSC retrieves the stored directory number correlated with the received TLDN.
- CdPn Called Party Number
- the first MSC then forwards the call back request using the retrieved directory number as the Called Party Number (CdPn) .
- CdPn Called Party Number
- a call back connection is then established between the PSAP and the roaming mobile station.
- the first MSC requests and receives a second TLDN from the second MSC.
- the second TLDN is also a wireline directory number representing the second MSC.
- the first MSC retrieves the second TLDN correlated with the received CdPn.
- the retrieved second TLDN is then used as the Called Party Number to directly forward the request from the first MSC to the second MSC.
- the second MSC then establishes a call back connection with the mobile station currently roaming in its coverage area.
- FIGURE 1 is a block diagram illustrating the network interconnection of multiple Public Land Mobile Networks (PLMN) to a Public Switched Telephone Network (PSTN) ;
- FIGURE 2 is a block diagram illustrating the establishment of an emergency call connection between a mobile station and a Public Safety Answering Point (PSAP) terminal;
- PLMN Public Land Mobile Networks
- PSTN Public Switched Telephone Network
- PSAP Public Safety Answering Point
- FIGURE 3 is a block diagram illustrating the roaming of a mobile station from a first mobile switching center (MSC) to a second MSC;
- MSC mobile switching center
- FIGURE 4 is a flowchart enumerating the steps taken by the serving MSC for enabling the PSAP terminal to call back the roaming mobile station in accordance with the teachings of the present invention
- FIGURE 5 is a block diagram illustrating the establishment of a call back connection between the PSAP terminal and the roaming mobile station using a stored Mobile Station Integrated Service Digital Network (MSISDN) number
- FIGURE 6 is a block diagram illustrating the communication of a new Temporary Local Directory Number (TLDN) from the second MSC to the first MSC; and
- MSISDN Mobile Station Integrated Service Digital Network
- FIGURE 7 is a block diagram illustrating the call forwarding of a call back request from the first MSC to the second MSC using the received TLDN as the Called Party Number.
- FIGURE 1 is a block diagram illustrating the network interconnection of multiple Public Land Mobile Networks (PLMN) 10a - 10b to a Public Switched Telephone Network (PSTN) 20.
- a mobile station 30 also known as a mobile terminal or equipment
- MSC mobile switching centers
- VLR visitor location register
- MSC/VLR mobile switching centers 40a - 40b servicing the geographic area covered by the network.
- Each MSC/VLR 40 communicates with the mobile station 30 via a radio channel 50.
- each PLMN 10a there exists a Gateway Mobile Switching Center (GMSC) 80a for routing incoming calls intended for the mobile station 30 to the appropriate MSC/VLR 40a.
- GMSC Gateway Mobile Switching Center
- the PLMN 10a is the home PLMN for the mobile station 30
- a call initiated by one of the local exchanges (LE) 70 within the PSTN 20 is first routed to the GSMC 80a via the access tandem (AT) 60.
- the GSMC 80a then sends a signal requesting routing information to the home location register (HLR) 90a serving the mobile station 30 (this step is hereinafter referred to as HLR interrogation) .
- HLR home location register
- the HLR 90a (which stores subscriber information and keeps track of the current location of the mobile station 30) returns a routing instruction back to the GMSC 80a.
- the returned routing instruction includes a network address indicating which MSC/VLR 40 is currently serving the mobile station 30.
- the GMSC 80a Upon receipt of such routing information, the GMSC 80a transmits the incoming call to the indicated MSC/VLR 40a.
- the serving MSC/VLR 40a then establishes a call connection over the radio link 50 with the mobile station 30 located within its MSC/VLR serving area.
- Such HLR interrogation by the GMSC 80a is necessary because the mobile station 30 is not tied to a fixed line or geographic location. Because the mobile station 30 can travel freely into any one of the MSC/VLR areas within a given PLMN 10, the MSC/VLR 40 serving the mobile station does not stay constant. Whenever the mobile station 30 travels into a different MSC/VLR coverage area, or the unit is turned on for the first time, the serving MSC/VLR 40 performs a location update process with the home HLR 90 to inform the home HLR 90 of the mobile station's current location. As a result, the home HLR 90 maintains the location information regarding the mobile station 30 regardless of which MSC/VLR 40 is currently serving the mobile station 30.
- the home HLR 90 is able to provide the network address of the MSC/VLR 40 currently serving the mobile station 30. Utilizing such location information received from the home HLR 90, the GSMC 80a routes the incoming call to the specified MSC/VLR 40.
- FIGURE 2 is a block diagram illustrating the establishment of an emergency call connection between the mobile station 30 and a Public Safety Answering Point (PSAP) 110.
- the Emergency Service Bureau (ESB) or more commonly known in the United States as 9-1-1 service provides emergency service to a person in need of help.
- a mobile subscriber seeking emergency service merely has to dial a short unique number (such as 911 in the U.S.) to request an emergency call connection with one of the Public Safety Answering Point (PSAP) terminals 120a-12On providing the ESB service.
- a signal requesting an emergency call connection such as an emergency call setup signal based on Direct Transfer Application Protocol (DTAP) , is transmitted by the mobile station 30 over a dedicated channel of the radio link 50.
- DTAP Direct Transfer Application Protocol
- the MSC/VLR 40 within the serving PLMN 10 receives the transmitted emergency call setup signal via a base station (BS) 100.
- the serving MSC/VLR 40 determines that this is a request for an emergency call connection and transmits a network setup request signal 150, such as an Initial Address Message
- the PSAP 110 receives the setup request signal 150 and establishes a connection between the mobile station 30 and one of the available PSAP terminals 120a-120n.
- the transmitted IAM signal 150 includes Calling Party Number (CgPn) and Called Party Number (CdPn) parameters.
- the CdPn parameter is analyzed by the telecommunications network to determine the intended destination node for the transmitted signal, and the CgPn parameter is later utilized by the destination node to call back or return a signal back to the originating node.
- the CgPn parameter for the first IAM message 150(1) transmitted from the MSC/VLR 40 towards the PSAP 110 contains the MSISDN value assigned to the mobile station 30. Utilizing the first IAM message 150(1) , a first call connection between the mobile station 30 and one of the PSAP terminals 120 connected to the PSAP 110 is established.
- the PSAP 110 initiates a call back request to establish a call connection with the mobile station 30 by transmitting a second IAM signal 150(2) .
- the received MSISDN value in the CgPn parameter of the first IAM signal 150(1) is utilized as the CdPn for the second IAM signal 150(2) . Since the received MSISDN number is a mobile directory number, in order to establish a call connection with the mobile station 30, the interrogation of the home HLR 90 and the rerouting of the call setup message by the GMSC 80a (not shown in FIG. 2) need to be performed in a manner described in FIG. 1.
- TLDN temporary local directory number
- the selected TLDN is then transmitted as the CgPn towards the PSAP 110 when transmitting the first IAM signal 150(1) to establish a first emergency call connection between the mobile station 30 and the PSAP terminal 120.
- the assigned TLDN and the correlated MSISDN are maintained by the serving MSC/VLR 40 until the assigned timer expires. After the timer expires, the assigned TLDN is released and made available for use by other emergency call connections. In case the first emergency call connection is disconnected between the two parties and the PSAP 110 wants to call back the mobile station 30, the received TLDN is transmitted as the CdPn for the second IAM signal 150(2) .
- the serving MSC/VLR 40 After receiving the second IAM signal 150(2) , if the timer has not yet expired, the serving MSC/VLR 40 retrieves the MSISDN correlated with the received TLDN from the register (R) 140 and establishes a call back connection with the mobile station 30. Accordingly, by utilizing the received TLDN representing a wireline address, the above mentioned incoming mobile call setup procedures can be avoided and the new call connection between the two parties directly established.
- FIG. 3 illustrating the roaming of the mobile station 30 from a first MSC/VLR 40(1) to a second MSC/VLR
- the mobile station 30 initiates an emergency call connection 160 while being served by the first MSC/VLR
- the call connection 160 from the mobile station 30 to the PSAP 110 is established using a TLDN associated with that particular MSC/VLR 40(1) as the CgPn. If the mobile station 30 later roams into another geographic area being served by the second MSC/VLR 40(2), the first
- MSC/VLR 40(1) hands over the call connection 160 to the second MSC/VLR 40(2) as illustrated by a signal link 180.
- the speech connection is established between the mobile station 30 and the PSAP 100 via the call connections 180 and 160.
- the first MSC/VLR 40(1) remains in the call connection as an "anchor switch" and connects the second MSC/VLR 40(2) with the PSAP 100. If the mobile station 30 subsequently goes onhook, the call connections 180 and 160 are disconnected.
- the second MSC/VLR 40(1) remains in the call connection as an "anchor switch" and connects the second MSC/VLR 40(2) with the PSAP 100. If the mobile station 30 subsequently goes onhook, the call connections 180 and 160 are disconnected.
- MSC/VLR 40(2) then performs a location update with the home HLR 90 to inform the home HLR 90 with the latest location of the mobile station 30.
- the home HLR 90 updates its data to reflect the changes in the mobile station's location and also provides requisite information to the new MSC/VLR 40(2) .
- the home HLR 90 further instructs the first MSC/VLR 40(1) to de-register the subscriber record pertaining to the mobile station 30 by transmitting the Cancel_Location signal. Thereinafter, the first MSC/VLR 40(1) no longer provides mobile service to the mobile station 30 unless the mobile station 30 roams back into the first MSC/VLR coverage area.
- the PSAP 110 attempts to call back the mobile station 30 using the received TLDN as the CdPn, the call back attempt fails.
- the received TLDN by the PSAP is a wireline directory number representing the first MSC/VLR 40(1) . If a call back setup request signal with that particular TLDN as the CdPn is transmitted, the call setup request signal is routed to the first MSC/VLR 40(1) as indicated by the CdPn.
- the first MSC/VLR 40 (1) Since the mobile station 30 has roamed out of the first MSC/VLR coverage area and the first MSC/VLR 40(1) has already removed all subscriber information pertaining to the mobile station 30 from its database, the first MSC/VLR 40 (1) is unable to process the received call back setup request. Furthermore, since the PSAP 110 is not aware of the MSISDN associated with the roaming mobile station 30, the PSAP 110 is also not able to call back the mobile station 30 directly.
- the home HLR 90 informs the first MSC/VLR 40(1) to de-register the mobile station 30 as illustrated by a signal link 200.
- the first MSC/VLR 40(1) deletes all subscriber information associated with the mobile station 30 from its database including the TLDN correlation data stored in the register
- FIGURE 4 is a flowchart enumerating the steps taken by the serving MSC for enabling the PSAP terminal to call back the roaming mobile station in accordance with the teachings of the present invention.
- the first MSC/VLR receives an emergency call connection request from the mobile station (step 210) .
- the first MSC/VLR retrieves the next available TLDN from its TLDN list (step 220) and transmits the retrieved TLDN as the Calling Party Number (CgPn) in its setup signal.
- Such a setup signal includes an Initial Address Message (IAM) transmitted over an Integrated Services Digital Network User Part (ISUP) signal link to request a call connection.
- IAM Initial Address Message
- ISUP Integrated Services Digital Network User Part
- each MSC/VLR contains a limited number of TLDNs
- the purpose of assigning a timer to a TLDN is to release the assigned TLDN after the timer expires and to enable a subsequent emergency call to utilize the same number.
- the emergency call connection between the mobile station and the PSAP is established at step 230.
- the first MSC/VLR determines that the subscriber information pertaining to the mobile station needs to be deleted from its database (step 240) . As described in FIG. 3, such a determination is made whenever the mobile station roams out of the first MSC/VLR coverage area and roams into a second MSC/VLR area.
- the home location register associated with the mobile station instructs the first MSC/VLR to de-register the mobile station by transmitting a Cancel Location signal. If the mobile station roams into the second MSC/VLR area in busy mode (in speech connection with the PSAP) , the home HLR instructs the first MSC/VLR to de-register the mobile station as soon as the existing call connection is disconnected and a new location update is performed by the second MSC/VLR.
- the first MSC/VLR determines whether the timer assigned to the particular TLDN correlated with the mobile station has expired (step 250) . In response to a determination that the timer has expired, the first MSC/VLR removes the subscriber information from its database and de-registers the mobile station (260) .
- the first MSC/VLR retains the data correlating the assigned TLDN with the MSISDN associated with the roaming mobile station (step 280) .
- a flag variable within the register (R) is further set to indicate that the mobile station associated with this MSISDN has moved out of the first MSC/VLR coverage area (step 290) . All other subscriber information pertaining to the mobile station, however, can be deleted from its database. The rest of the de-registration procedure is performed in a conventional manner at step 300. By not deleting the data correlating the MSISDN number associated with the assigned TLDN from the register (R) , the first MSC/VLR is later able to process a call back connection request received from the PSAP.
- FIG. 5 is a block diagram illustrating the establishment of a call back connection between the PSAP terminal 110 and the roaming mobile station 30 using the maintained correlation data as described in FIG. 4.
- the PSAP 110 in response to a disconnection of the original call connection, requests a call back connection with the mobile station 30 using the previously received TLDN as the CdPn. Since the received TLDN represents a wireline directory number for the first MSC/VLR 40(1) , the request for call back connection is accordingly routed to the first MSC/VLR 40(1) . Even though the first MSC/VLR 40(1) no longer provides mobile service to the mobile station 30, as a result of the procedures described in FIG.
- the first MSC/VLR 40(1) still retains the data correlating the received TLDN with the MSISDN associated with the mobile station 30. Therefore, an application module 340 retrieves the flag variable (F) 310 from the register (R) 140(1) to determine that the mobile station associated with the stored MSISDN 330 has roamed out of the first MSC/VLR coverage area. The first MSC/VLR 40(1) then forwards the received request, such as an IAM, utilizing the retrieved MSISDN as the new CdPn. Since the indicated MSISDN is a mobile number uniquely representing the mobile station 30, the request signal is first routed to the GMSC associated with the home HLR 90 (signal link 350) .
- the GMSC 80a then interrogates the home HLR 90 for routing information (signal link 360) .
- the home HLR 90 by retrieving the latest subscriber location information from its register 1 (Rl) 95, further request a roaming number from the second MSC/VLR 40(2) currently serving the mobile station 30 (signal link 370) .
- the second MSC/VLR 40(2) provides the roaming number back to the home HLR 90.
- the home HLR 90 further returns the roaming number back to the GMSC 80a. Utilizing the received roaming number indicating the network address of the second MSC/VLR 40(2), the request signal for establishing a call back connection is routed from the GMSC 80a to the second MSC/VLR 40(2) (signal link 380) .
- the second MSC/VLR 40(2) then provides the call back connection with the PSAP 110 by establishing the radio link 50 with the mobile station 30 roaming within its coverage area.
- the first MSC/VLR 40(1) which no longer serves the mobile station 30, received the request for a call back connection, by retaining the relevant information and forwarding the request to the second MSC/VLR, the call back connection is established between the PSAP 110 and the mobile station 30.
- FIG. 6 illustrates the communication of a new TLDN from the second MSC/VLR 40(2) receiving the roaming mobile station 30 to the first MSC/VLR 40(1) transferring the roaming mobile station 30.
- the first MSC/VLR determines that the target cell belongs to the second MSC/VLR 40(2) and requests handover of the call connection to the second MSC/VLR 40(2) . While requesting handover to the second MSC/VLR 40(2) , in accordance with the teachings of the present invention, the first MSC/VLR 40(1) further requests one of the TLDNs associated with the second MSC/VLR 40(2) (signal link 400) . In response to such a request, the second MSC/VLR 40(2) retrieves the next available TLDN from its TLDN list and sends it back to the first MSC/VLR 40(1) (signal link 410) .
- Such communications can be accomplished by utilizing the existing handover signals (Prepare_Handover and Prepare_HandoverAck) , or by introducing new Mobile Application Part (MAP) based signals.
- the second MSC/VLR 40(2) further stores data correlating the transmitted TLDN 420 with the MSISDN 330 associated with the roaming mobile station 30.
- the first MSC/VLR 40(1) updates the correlation data in the register (R) 140 (1) to correlate the received TLDN with the previously assigned TLDN associated with the first MSC/VLR 40(1) .
- the MSISDN stored in the register (R) 140(1) is effectively overwritten with the received TLDN associated with the second MSC/VLR 40(2) .
- the flag variable 310 within the register (R) 140(1) is also updated to indicate that the mobile station associated with the stored MSISDN has roamed out of the first MSC/VLR service area.
- the mobile station 30 roams into the second MSC/VLR area in idle mode after the disconnection of the original call connection with the PSAP 110 (including turning on the mobile station for the first time in the second MSC/VLR area after leaving the first MSC/VLR area) .
- the second MSC/VLR 40(2) detects the mobile station's presence and requests from the first MSC/VLR 40(1) , during the mobile station's authentication procedure, certain necessary system parameters.
- the first MSC/VLR 40(1) places an indication requesting the second MSC/VLR 40(2) to assign and transmit a new TLDN back to the first MSC/VLR 40(1) .
- the second MSC/VLR 40(2) retrieves, in accordance with the indication included in the return signal, the next available TLDN, stores the retrieved TLDN 420 with the MSISDN number 330 in its register, and transmits the retrieved TLDN to the first MSC/VLR 40(1) via another MAP signal 410.
- the first MSC/VLR 40(1) updates the correlation data to correlate the newly received TLDN with the previously assigned TLDN.
- the second MSC/VLR 40(2) then performs a location update with the home HLR 90 associated with the mobile station 30 (signal link 190) .
- the home HLR 90 informs the first MSC/VLR 40(1) to de-register the roamed out mobile station 30 from its database using a MAP signal such as Cancel Location in a manner described above. Because the assigned timer is still valid, the first MSC/VLR 40(1) retains the subscriber record along with the newly received TLDN.
- FIGURE 7 is a block diagram illustrating the call forwarding of a call back request from the first MSC/VLR 40(1) to the second MSC/VLR 40(2) while utilizing the stored second TLDN as the CdPn.
- the PSAP 110 requests a call back connection with the mobile station 30 in response to a disconnection of the original call connection, the previously received CgPn parameter is utilized as the CdPn parameter for the call back request signal.
- the call back request signal such as an IAM
- the first MSC/VLR 40(1) retains the data correlating the received TLDN with the new TLDN associated with the second MSC/VLR 40(2) .
- the application module 340(1) within the first MSC/VLR 40(1) determines that the mobile station 30 associated with the received TLDN is no longer within the first MSC/VLR coverage area by evaluating the flag variable 310.
- the application module 340(1) then retrieves the new TLDN 420 associated with the received TLDN 320 from its register (R) 140(1) and forwards the IAM signal using the retrieved TLDN 420 as the new CdPn. Since the new TLDN 420 represents a wireline directory number associated with the second MSC/VLR 40(2), the call back request signal is directly routed from the first MSC/VLR 40(1) to the second MSC/VLR 40(2) without performing the mobile call routing procedures (i.e., HLR interrogation) .
- the application module 340(2) within the second MSC/VLR 40(2) indexes its register (R) 140(2) with the received TLDN 420 to retrieve the correlated MSISDN 330 associated with the mobile station 30. After retrieving the MSISDN 330 from its register, the second MSC/VLR 40(2) determines the exact location of the roaming mobile station 30. After alerting the mobile station 30 of an incoming call, the call back connection is accordingly established between the mobile station 30 and the PSAP 110.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97927856A EP0900494B1 (en) | 1996-05-21 | 1997-05-20 | Emergency call back for roaming mobile radio subscribers |
DE69711867T DE69711867T2 (en) | 1996-05-21 | 1997-05-20 | EMERGENCY RECALL FOR WALKING MOBILE WIRELESS PARTICIPANTS |
AU32213/97A AU730984B2 (en) | 1996-05-21 | 1997-05-20 | Emergency call back for roaming mobile radio subscribers |
JP54297797A JP2001509973A (en) | 1996-05-21 | 1997-05-20 | Emergency call back for roaming mobile wireless subscribers |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/655,349 | 1996-05-21 | ||
US08/655,349 US5712900A (en) | 1996-05-21 | 1996-05-21 | Emergency call back for roaming mobile subscribers |
Publications (2)
Publication Number | Publication Date |
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WO1997044945A2 true WO1997044945A2 (en) | 1997-11-27 |
WO1997044945A3 WO1997044945A3 (en) | 1997-12-31 |
Family
ID=24628532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/009257 WO1997044945A2 (en) | 1996-05-21 | 1997-05-20 | Emergency call back for roaming mobile radio subscribers |
Country Status (6)
Country | Link |
---|---|
US (1) | US5712900A (en) |
EP (1) | EP0900494B1 (en) |
JP (1) | JP2001509973A (en) |
AU (1) | AU730984B2 (en) |
DE (1) | DE69711867T2 (en) |
WO (1) | WO1997044945A2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP0900494A2 (en) | 1999-03-10 |
US5712900A (en) | 1998-01-27 |
DE69711867D1 (en) | 2002-05-16 |
DE69711867T2 (en) | 2002-10-10 |
WO1997044945A3 (en) | 1997-12-31 |
AU730984B2 (en) | 2001-03-22 |
EP0900494B1 (en) | 2002-04-10 |
AU3221397A (en) | 1997-12-09 |
JP2001509973A (en) | 2001-07-24 |
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