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WO1999059371A1 - Centre de commutation mobile realisant un appel vers une station mobile a portee etendue comme si la station mobile etait une station mobile locale - Google Patents

Centre de commutation mobile realisant un appel vers une station mobile a portee etendue comme si la station mobile etait une station mobile locale Download PDF

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Publication number
WO1999059371A1
WO1999059371A1 PCT/US1999/007985 US9907985W WO9959371A1 WO 1999059371 A1 WO1999059371 A1 WO 1999059371A1 US 9907985 W US9907985 W US 9907985W WO 9959371 A1 WO9959371 A1 WO 9959371A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile station
call
mobile switching
roaming
switching center
Prior art date
Application number
PCT/US1999/007985
Other languages
English (en)
Inventor
Dipankar Ray
Vladimir Alperovich
Original Assignee
Ericsson Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc. filed Critical Ericsson Inc.
Priority to AU35554/99A priority Critical patent/AU3555499A/en
Publication of WO1999059371A1 publication Critical patent/WO1999059371A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server

Definitions

  • This invention relates to completing a call to mobile station in a wireless network, and more specifically, to a system and method for completing a local call to a roaming mobile station without the call being routed to the mobile station's home network.
  • Wireless telecommunication services are available in most of the populated areas of the world.
  • a subscriber can use his/her mobile station at home or away from home, as long as the visited wireless network uses the same basic technology as the subscriber's home system (i.e., Global System for Mobile Communications, Code Division Multiple Access, etc.).
  • the visited wireless network uses the same basic technology as the subscriber's home system (i.e., Global System for Mobile Communications, Code Division Multiple Access, etc.).
  • Using a mobile station away from its home network is known as roaming.
  • Most wireless networks are structured to support both local and roaming mobile stations.
  • a mobile station Whether a mobile station is in its home wireless network or is roaming, it must register with a local mobile switching center (MSC). "Registration" of a mobile station is similar to connecting a wire line telephone.
  • the wire line telephone must have an identity in the local switching office (a directory number and line identification) before it can make and receive calls.
  • a mobile station Similarly, a mobile station must have an identity in the local MSC before it can make and receive calls.
  • a mobile station registers when it is switched on within a wireless network.
  • the mobile station sends identification data (including its directory number) to the local MSC, which stores this data in a visitor location register (VLR).
  • the local MSC notifies the home location register (HLR) of the wireless station that the mobile station is currently located in the MSC's service area.
  • the HLR sends back data that the local MSC requires to provide service to the mobile station (e.g., equipment identification number and other authentication information).
  • This data -2- is also stored in the local MSC's VLR.
  • Originating a mobile call is basically the same whether the mobile station is in its home wireless network or is roaming, except that roaming charges may apply. Delivering a call to a mobile station, however, depends on whether the mobile station is in its home network or is roaming.
  • a call to a mobile station operating in its local wireless network originates from any wire line telephone or mobile station.
  • the switching network receives the dialed directory number, recognizes that the call is to a mobile station, and routes the call to an MSC.
  • the MSC queries its VLR, or, if the mobile station is not found there, the local HLR to determine the current location of the mobile station.
  • the MSC then creates a connection through the facilities of the wireless network to the mobile station. Normal local charges accrue to the calling party and to the mobile station.
  • routing a call to a roaming mobile station is more complex.
  • a call may originate from a wire line telephone or a mobile station near to the roaming mobile station.
  • the dialed directory number is recognized as a directory number of the home wireless network of the roaming mobile station. Therefore, the call is routed through the public switched telephone network (which may include long distance networks) to the MSC of the roaming mobile station's home wireless. This MSC queries the local HLR to determine the current location of the roaming mobile station. The home MSC then routes the call to the MSC in the visited wireless network. The MSC of the visited wireless network uses its VLR to locate the mobile station and deliver the call.
  • a problem in calling a roaming mobile station is that the mobile station may be in the same town, or even next door to the calling party. However, the calling party may be charged for a long distance call to the home wireless network, and either the calling or called party is charged for extending the call to the visited service region. This can be expensive both for the calling party and the called party.
  • a unique routing code is associated with a local gateway mobile switching center (GMSC).
  • PSTN public switched telephone network
  • PSTN public switched telephone network
  • the GMSC receives the directory number of the mobile station.
  • the GMSC locates the called roaming mobile station and routes the call to the MSC where the roaming mobile station is currently registered.
  • the PSTN delivers a directory number of the mobile station to a GMSC responsive to a code and the directory number of the roaming mobile station.
  • the GMSC sends a paging message to a predefined set of MSC's that comprise the local service region.
  • Each MSC (including the GMSC) checks its respective visitor location register to determine if a roaming mobile station associated with the directory number is registered. If an MSC finds the roaming mobile station, it reports back to the GMSC, which then extends the call to the responding MSC. The responding MSC sets up delivery of the call to the roaming mobile station.
  • the PSTN delivers a call for a roaming mobile station to a GMSC in response to a local directory number or a special code.
  • the GMSC connects the received call to a system for prompting the caller to enter the roaming mobile station's directory number.
  • an intelligent peripheral may be connected to the caller to prompt the caller and recognize and interpret digits as they are received.
  • the intelligent peripheral then passes the directory number of the roaming mobile station back to the GMSC.
  • the GMSC sends a message including the directory number of the roaming mobile station to the home location register (HRL) of the roaming mobile station.
  • the HLR returns a message indicating the location of the roaming mobile station and routing information for delivering the call to the MSC associated with the location.
  • the GMSC extends the call to the destination MSC, which sets up a call with the roaming mobile station.
  • FIG. 1 is a block diagram of a wireless network illustrating our methods for completing a call to a roaming mobile station
  • Fig. 2 is a block diagram of a gateway mobile switching center of Fig.1 ;
  • Fig. 3 is a call flow diagram according to one exemplary embodiment of our method; and Fig. 4 is a call flow diagram according to a further embodiment of our method.
  • Fig. 1 illustrates a typical wireless network, shown generally at 10, that supports both local and roaming mobile stations.
  • Wireless network 10 is connected to the public switched telephone network (PSTN) 12, which comprises a plurality of other wireless and landline networks, by a plurality of lines and/or trunks 22.
  • PSTN 12 is connected to wireless network 10 at a mobile switching center (MSC) 14, which is a "gateway" MSC (GMSC), because it connects wireless network 10 to a portion of PSTN 12.
  • MSC mobile switching center
  • GMSC 14 controls the connection of calls between PSTN 12 and mobile stations in wireless network 10 and controls the connections of calls between mobile stations.
  • GMSC 14 is connected to a visitor's location register (VLR) 32 via communications path 33.
  • VLR visitor's location register
  • GMSC 14 is further connected to a plurality of other MSC's, represented by MSC 34 and MSC 36.
  • MSC's 34 and 36 connect calls between GMSC and base transceiver stations (including any intermediate units), and provides pathways to connect wireless calls to other MSC's or to connect wireless-to-wireless calls between mobile stations.
  • MSC's 34 and 36 monitor the mobile stations in the portion of the wireless network under its control and manage wireless resources (such as base transceiver stations) to provide wireless communications for the mobile stations.
  • MSC's 34 and 36 could also be gateways from different portions -5- of PSTN 12.
  • GMSC 14 is connected to a plurality of base transceiver stations (BTS's), represented by BTS 46 and 48, and manages mobility of mobile stations operating in the area.
  • BTS's 46 and 48 provide radio communications and radio communications management for all mobile stations in its respective coverage area (cell).
  • BTS's 46 and 48 provide coverage in cells 50 and 52, respectively.
  • all cells are shown as hexagons. In an operating wireless network, cells are irregularly shaped, overlapping areas, which are determined based upon the features of the terrain. Further, there are many more BTS's and may be intermediate units between the BTS's and the MSC.
  • MSC 34 supervises connection of calls within a geographical area of wireless network 10. MSC 34 controls and coordinates the actions of BTS's 54, 56 and 58 within cells 60, 62 and 64, respectively. MSC 36 supervises service for another region within wireless network 10. MSC 36 is connected to a plurality of BTS's, represented by BTS's 66 and 68, that provide radio communications and radio communications controls within cells 70 and 72 respectively.
  • Wireless network 100 includes GMSC 102.
  • GMSC 102 coordinates the actions BTS's 114 and 116.
  • BTS's 114 and 116 deliver wireless services in cells 118 and 120, respectively.
  • One or more long distance networks 122 connect wireless network 100 to PSTN 12.
  • Signaling links 125 connect signaling network 124 to GMSC's 102 and 14.
  • Signaling network 124 may also be connected to MSC's 34 and 36 (not shown for clarity).
  • HLR home location registers
  • HLR 126 stores the current location of mobile stations and information required to identify, authenticate, and verify a mobile station to provide service and prevent fraud.
  • All MSC's 102, 14, 34 and 36 are connected to a respective visitor location register (VLR) 128, 32, 130 and 132. Each VLR stores the identification and last location of mobile stations that are registered within their respective service regions.
  • An intelligent peripheral (IP) 134 is connected to GMSC 14, by dedicated link 135. Alternatively, GMSC 14 may access IP 134 via signaling network 124. -6-
  • IP 134 provides services for GMSC 14 that GMSC 14 cannot do for itself.
  • IP 130 includes digit recognition 136, speech recognition 138 and a voice prompting system 140.
  • Wire line telephone 142 is connected to PSTN 12.
  • Wire line telephone 142 is within a local service region that includes portions of PSTN 12 and wireless network 10.
  • Wireless mobile station 144 is a roaming mobile station whose home wireless network is wireless network 100.
  • Mobile station 146 is operating in its home wireless network 10.
  • Roaming mobile station 144, mobile station 146 and telephone 142 are all within the same local service region. If telephone 142 makes a call to mobile station 146 (whose home network is local network 10), both telephone 142 and mobile station 146 incur the usual local charges associated with such calls.
  • a call from telephone 142 to roaming mobile station 1 6 is routed to GMSC 102 and then back to wireless network 10.
  • Telephone 142 is charged for a long distance call through long distance network 122, and either telephone 142 or roaming mobile station 144 is charged for routing the call back to wireless network 10. It is thus more expensive for telephone 142 to call a roaming mobile station 144, which is relatively close, than mobile station 146, which is on the other end of wireless network 10.
  • Fig. 2 illustrates GMSC 14 that supports our method.
  • GMSC 14 generally comprises a wireline side 202 and a wireless side 204, which are controlled and coordinated by switch control 206.
  • Calls for mobile stations arrive on lines or trunks 22 from PSTN 12 at telephone user part (TUP) 210, which is the terminal interface for analog calls.
  • TUP telephone user part
  • ISUP ISDN user part
  • GMSC 14 interfaces ISDN lines, trunks and communication links to GMSC 14.
  • TCAP 214 When a call is received at TUP 210 (or ISUP 208), transactional capabilities application part (TCAP) 214 begins a transaction to locate and connect the call to the destination mobile station. To this end, TCAP 214 informs mobile application protocol (MAP) 212 of the new call and the destination mobile station's directory number. MAP 212 sends a message through ISUP 208 and signaling network 124 -7- to HLR 126 (Fig. 1) to request the last registered location of the mobile station. When a response is received, MAP 212 informs TCAP 214 of the last registered location of the destination mobile station. If the mobile station is currently served by another MSC (such as MSC 34), TCAP 214 routes the call through ISUP 208 to MSC 34. If the mobile station is currently served by GMSC 14, the call is routed through the message protocol layers signaling collection control part (SCCP) 216 and message transport part (MAP) 218 to the wireless side 204.
  • SCCP message protocol layers signaling collection control part
  • MAP message transport
  • Switch control 206 informs communication manager (CM) 226 to set up communication with the destination mobile station.
  • CM communication manager
  • the currently serving BTS is obtained from mobility manager (MM) 228, which tracks mobile stations as they move through wireless network 10.
  • Radio resources (RR) 230 checks that there are radios available for the call.
  • BSSAP Base station system application part (BSSAP) 224 is then instructed to route the call to the appropriate BTS.
  • the call is the received at MTP 230, routed through SCCP 228 and to BSSAP 224 to the serving BTS.
  • Fig. 1 taken in conjunction with the call flow diagram of Fig. 2.
  • the caller at telephone 142 wants to call roaming mobile station 144.
  • the caller also knows that the roaming mobile station is in the local calling region of telephone 142. Therefore, the caller at telephone 142 dials a special code or local directory number.
  • the special code indicates to PSTN 12 that the caller is requesting a local roaming connection.
  • PSTN 12 delivers the call to GMSC 14.
  • GMSC 14 answers the call and prompts the user for the directory number of the mobile station.
  • GMSC 14 generates a tone as a prompt (as is currently done in the areas of pagers).
  • GSMC 14 When GSMC 14 receives the directory number of roaming mobile station 144, it sends a paging message to all other MSC's 34 and 36 in its predefined local area, which includes the directory number of roaming mobile station 144. These messages are sent simultaneously to all MSC's in this group.
  • a predefined local area may include just one MSC, or may include two or more depending upon the local service provider, the size of the local service region, etc.
  • Each MSC 14, 34 and 36 checks its respective VLR's 32, 130 and 132 to -8- determine if a roaming mobile station with the dial directory number is present in its local area.
  • VLR 130 associated with MSC 34 includes the location of roaming mobile station 144, because roaming mobile station 144 registered with MSC 34 when it was turned on.
  • MSC 34 returns this information to GMSC 14.
  • MSC 34 then sends a radio link paging message to BTS 58 in cell 64. Normal call setup is performed and the call is completed from telephone 142 through PSTN 12, GMSC 14, MSC 38, BTS 58 to roaming mobile station 144.
  • a roaming mobile station such as 144
  • a roaming mobile station can be contacted on a local billing cost basis even though the directory number may indicate a long distance, or even out-of-country, destination. That is, dialing the directory number directly would normally cause the PSTN to deliver the call to a remote destination (such as GMSC 102); but, because of the special code, it is delivered to local GMSC 14.
  • a remote destination such as GMSC 102
  • GMSC 102 remote destination
  • substantial savings may be realized both for the calling party at telephone 142 and the called party at roaming mobile station 144.
  • This directory number may be a local directory number, some form of "800” or "888” number or a prefix code (office code or the first three digits of a seven digit number).
  • PSTN 12 recognizes the special number and routes the call to the nearest gateway MSC.
  • GMSC 14 receives the call and routes it to intelligent peripheral (IP) 134.
  • IP intelligent peripheral
  • a connection is made between telephone 142 and IP 134.
  • the voice prompt unit
  • IP 134 prompts the user of telephone 142 to enter the directory number of the destination roaming mobile station 144. Digit recognition may be through digit recognition unit 136 that receives and translate touch-tone signals and dial pulse signals, or through speech recognition unit 140, that can recognize and translate spoken digits. The collected digits are then sent to GMSC 14. By setting up a call through IP 134, the initial step of routing the call to the home GMSC is bypassed. In this manner, the call enters the wireless network at a local gateway rather than at a gateway that could be a great distance away.
  • GMSC 14 sends a message on signaling network 124 to HLR 126 to determine the current location of roaming mobile -9- station 144. HLR 126 returns this information to GMSC 14 to set up a call to roaming mobile station 144. At this point, it is advantageous that GMSC 14 determines whether the location of roaming mobile station 144 is within the limited boundary for local calling. This check prevents abuse of local calling in order to make a long distance call through the wireless network.
  • GMSC 14 extends the call to that MSC, in this case MSC 34.
  • MSC 34 then sends a radio link paging message for roaming mobile station 144, which responds, and a mobile call is set up. The call is then completed between the caller of telephone 142 and roaming mobile station 144.

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un système et un procédé visant à acheminer un appel vers une station mobile à portée étendue (64) comme un appel local même si la région de service locale n'est pas la région de service primaire. Un code d'acheminement unique est associé à un centre de commutation mobile passerelle (GMSC) (14). Lorsque le réseau de télécommunications achemine un appel vers le GMSC (14), ce dernier obtient le numéro de téléphone de la station mobile, puis détermine l'emplacement de la station mobile à portée étendue dans une région de service locale prédéterminée. L'appel est ensuite acheminé vers le centre de commutation mobile (34) où la station mobile à portée étendue est généralement enregistrée.
PCT/US1999/007985 1998-05-14 1999-04-12 Centre de commutation mobile realisant un appel vers une station mobile a portee etendue comme si la station mobile etait une station mobile locale WO1999059371A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU35554/99A AU3555499A (en) 1998-05-14 1999-04-12 Mobile switching center that completes a call to a roaming mobile station as if the mobile station were a local mobile station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7896398A 1998-05-14 1998-05-14
US09/078,963 1998-05-14

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WO1999059371A1 true WO1999059371A1 (fr) 1999-11-18

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065884A1 (fr) * 2000-03-01 2001-09-07 Markport Limited Acheminement optimise des appels de postes du service mobile
WO2002043405A1 (fr) * 2000-11-27 2002-05-30 Nokia Corporation Procede de routage d'appel dans un systeme de communication
WO2003019969A1 (fr) * 2001-08-23 2003-03-06 Patson Anius Procede et systeme permettant d'acheminer des appels vers un dispositifs de telecommunication
GB2380100A (en) * 2001-08-30 2003-03-26 British Telecomm A gateway system for facilitating transmission of text messages from a terminal in one network to a terminal in another via virtual location registration
EP1942695A1 (fr) * 2007-01-08 2008-07-09 Halys Système de mobiles à deux cartes SIM
WO2009005592A1 (fr) * 2007-06-27 2009-01-08 Lucent Technologies Inc. Etablissement d'appel pour abonnés itinérants
WO2009056675A1 (fr) * 2007-10-30 2009-05-07 Teliasonera Ab Procédé et dispositif d'optimisation dans des réseaux de communication

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996020574A1 (fr) * 1994-12-23 1996-07-04 Nokia Telecommunications Oy Methode d'acheminement d'un appel international vers un abonne mobile a l'etranger
WO1998011752A1 (fr) * 1996-09-16 1998-03-19 Ericsson Inc. Acheminement optique optimise d'appels vers des abonnes itinerants dans un reseau de telecommunications

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996020574A1 (fr) * 1994-12-23 1996-07-04 Nokia Telecommunications Oy Methode d'acheminement d'un appel international vers un abonne mobile a l'etranger
WO1998011752A1 (fr) * 1996-09-16 1998-03-19 Ericsson Inc. Acheminement optique optimise d'appels vers des abonnes itinerants dans un reseau de telecommunications

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001065884A1 (fr) * 2000-03-01 2001-09-07 Markport Limited Acheminement optimise des appels de postes du service mobile
WO2002043405A1 (fr) * 2000-11-27 2002-05-30 Nokia Corporation Procede de routage d'appel dans un systeme de communication
WO2003019969A1 (fr) * 2001-08-23 2003-03-06 Patson Anius Procede et systeme permettant d'acheminer des appels vers un dispositifs de telecommunication
GB2380100A (en) * 2001-08-30 2003-03-26 British Telecomm A gateway system for facilitating transmission of text messages from a terminal in one network to a terminal in another via virtual location registration
EP1942695A1 (fr) * 2007-01-08 2008-07-09 Halys Système de mobiles à deux cartes SIM
FR2911238A1 (fr) * 2007-01-08 2008-07-11 Halys Soc Par Actions Simplifi Systeme de mobiles a deux cartes sim
WO2009005592A1 (fr) * 2007-06-27 2009-01-08 Lucent Technologies Inc. Etablissement d'appel pour abonnés itinérants
US8855628B2 (en) 2007-06-27 2014-10-07 Alcatel Lucent Call setup for roaming subscribers
WO2009056675A1 (fr) * 2007-10-30 2009-05-07 Teliasonera Ab Procédé et dispositif d'optimisation dans des réseaux de communication
US9226132B2 (en) 2007-10-30 2015-12-29 Teliasonera Ab Optimisation method and device in communication networks

Also Published As

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