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WO1997046043A2 - Systeme et procede servant a transmettre des appels hors secteur local dans des centres de commutation multiples de telecommunications radio - Google Patents

Systeme et procede servant a transmettre des appels hors secteur local dans des centres de commutation multiples de telecommunications radio Download PDF

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Publication number
WO1997046043A2
WO1997046043A2 PCT/SE1997/000811 SE9700811W WO9746043A2 WO 1997046043 A2 WO1997046043 A2 WO 1997046043A2 SE 9700811 W SE9700811 W SE 9700811W WO 9746043 A2 WO9746043 A2 WO 9746043A2
Authority
WO
WIPO (PCT)
Prior art keywords
mscs
msc
mobile subscriber
roamer port
call
Prior art date
Application number
PCT/SE1997/000811
Other languages
English (en)
Other versions
WO1997046043A3 (fr
Inventor
George Foti
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
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 Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to BR9709480A priority Critical patent/BR9709480A/pt
Priority to CA002255847A priority patent/CA2255847C/fr
Priority to AU30518/97A priority patent/AU3051897A/en
Publication of WO1997046043A2 publication Critical patent/WO1997046043A2/fr
Publication of WO1997046043A3 publication Critical patent/WO1997046043A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/06—User notification, e.g. alerting and paging, for incoming communication, change of service or the like using multi-step notification by changing the notification area
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/12—Inter-network notification

Definitions

  • This invention relates to radio telecommunication systems and, more particularly, to a system and method of utilizing a single roamer port number in a plurality of radio telecommunication switches.
  • mobile subscribers may roam from a home network to a visited network which may be located outside the local calling area of the home network.
  • a visited network which may be located outside the local calling area of the home network.
  • long distance charges may be incurred by the mobile subscriber, the calling party, or both. This is true even if the calling party and the mobile subscriber are both located within the local calling area of the visited network.
  • existing radio telecommunications networks utilize the following process of placing a call from a local subscriber in a visited network to a roaming mobile subscriber who is roaming in the visited network.
  • the local subscriber dials the long distance number of the roaming subscriber since the local subscriber does not know that the roaming mobile subscriber has roamed into the visited network.
  • the call from the local subscriber goes first to the Mobile Switching Center (MSC) in the visited network serving the local subscriber.
  • MSC Mobile Switching Center
  • the MSC routes the call long distance to the home MSC of the roaming mobile subscriber because the Subscriber Number
  • SNB of the called mobile station (MS) is identified as being from the mobile subscriber's home network.
  • the home MSC interrogates the mobile subscriber's Home Location Register (HLR) in the mobile subscriber's home network to obtain subscriber profile information and location information for the roaming mobile subscriber.
  • HLR Home Location Register
  • the mobile subscriber's HLR provides location information indicating that the mobile subscriber is roaming in the visited network.
  • the call is then routed from the home MSC back to the visited network. Long distance charges are thus incurred by both the calling subscriber and the called subscriber.
  • a call is made from the PSTN in the local calling area of the visited network, to a mobile subscriber who is roaming in the visited network, the call is first routed by the PSTN to a gateway MSC (G-MSC) in the mobile subscriber's home network, thereby incurring long distance charges for the calling party.
  • G-MSC gateway MSC
  • the G-MSC interrogates the mobile subscriber's HLR and determines that the mobile subscriber is in the visited network. Then the call is routed from the G-MSC to the visited network MSC, thereby incurring long distance charges for the called mobile subscriber.
  • two long distance trunks are established and both subscribers pay long distance charges.
  • Roamer port numbers utilize two-stage dialing to enable a local subscriber in the visited network to place a call to a mobile subscriber who is roaming in the visited network without incurring long distance charges. If a local subscriber in the visited network calls a mobile subscriber who is roaming in the visited network, the local subscriber dials the roamer port number for his MSC which is a local number. He then gets a second dial tone, and dials the mobile subscriber's number.
  • the roamer port number is defined in the visited network subscriber's MSC and may be the entire service area of the visited MSC or some sub-area thereof. The roamer port number tells the visited MSC to page for the roaming mobile subscriber in the roamer port service area. That allows a local subscriber in the visited network to call the mobile subscriber who is roaming in the visited network without incurring long distance charges.
  • Some existing radio telecommunications networks may provide for sequential paging of all of the MSCs in a metropolitan area until a roaming mobile subscriber is found. The problem with this approach is that there may be an excessive delay before the mobile subscriber is located. As a result, the calling party often hangs up, or the trunks time out before the mobile subscriber is located. Since the number of MSCs continues to increase in major metropolitan areas, the sequential paging method is inadequate and unworkable.
  • Existing radio telecommunications networks may also provide an enhanced roamer port feature.
  • V-MSC visited MSC
  • the V- MSC recognizes the MSNB of the MS as being associated with the mobile subscriber's home exchange.
  • the V-MSC then interrogates the subscriber's HLR for location and profile information for the mobile subscriber.
  • the mobile subscriber's HLR determines the location of the mobile subscriber and returns the location information to the V- MSC with a temporary routing number. If the routing number is a local number within the visited network, the V-MSC delivers the call.
  • long distance interrogation of the mobile subscriber's HLR is not desirable to network operators due to the administrative overhead burden of having to update tables associating HLRs with every roaming mobile subscriber that enters the V-MSC.
  • network operators prefer that the roamer port process be an entirely local process within the visited network.
  • Buhl '902 discloses a mobile communication system in which a mobile subscriber may roam from one exchange to another. An interrogation exchange receives incoming calls to the mobile subscriber and requests information as to the location of the mobile subscriber from its home exchange.
  • the home exchange initiates and coordinates the paging process to a plurality of possible exchanges in which the mobile subscriber may be located.
  • Buhl '902 is not a local process.
  • Buhl '902 requires long distance interrogation of the home exchange to obtain location information for the mobile subscriber. As noted above, this is not desirable to network operators due to the administrative overhead burden of having to update tables in the visited exchange associating HLRs with every roaming MS that enters the visited exchange. Additionally, calling subscribers as well as called mobile subscribers may incur long distance charges with the system of Buhl '902. Thus Buhl '902 does not teach or suggest the present invention.
  • Buhl '240 discloses a mobile communication system in which the home exchange of a mobile subscriber maintains location information for the mobile subscriber. Upon receipt of an incoming call for the mobile subscriber, the home exchange orders the exchange (s) where the mobile subscriber may be found to page the mobile subscriber and establish a voice channel to the mobile subscriber before routing the call through the network. Buhl '240, however, is not a local process. Buhl '240 requires long distance interrogation of the home exchange to obtain location information for the mobile subscriber. As noted above, this is not desirable to network operators due to the administrative overhead burden of having to update tables in the visited exchange associating HLRs with every roaming MS that enters the visited exchange. Additionally, calling subscribers as well as called mobile subscribers may incur long distance charges with the system of Buhl '240. Thus Buhl '240 does not teach or suggest the present invention.
  • Such an implementation would reduce the administrative overhead burden of having to update tables associating every roaming mobile subscriber that enters the V-MSC with the mobile subscriber's HLR.
  • the system would provide a means of contacting the roaming mobile subscriber through the roamer port number.
  • the present invention provides such a system and method.
  • the present invention is a system for extending roamer port coverage from a single mobile switching center (MSC) to a plurality of MSCs within a visited radio telecommunications network in which a mobile subscriber is roaming.
  • the system comprises means for associating a roamer port number with a plurality of MSCs within the visited radio telecommunications network, means for simultaneously paging for the roaming mobile subscriber within each of the associated plurality of MSCs upon receipt of a call for the mobile subscriber through the roamer port number, and means for routing the call to one of the plurality of associated MSCs in which a successful page response is received.
  • the means for simultaneously paging for the roaming mobile subscriber within each of the associated plurality of MSCs may include means within a first MSC for placing simultaneous calls by seizing trunks to each of the associated plurality of MSCs upon receipt of the call for the roaming mobile subscriber, and means within the first MSC for instructing each of the associated plurality of MSCs to simultaneously page for the roaming mobile subscriber.
  • the means for simultaneously paging for the roaming mobile subscriber within each of the associated plurality of MSCs may include means within the first MSC for utilizing network signaling messages to notify each of the associated plurality of MSCs that the call is a roamer port call and to instruct each of the associated plurality of MSCs to page for the roaming mobile subscriber.
  • the present invention is a method of extending roamer port coverage from a single mobile switching center (MSC) to a plurality of MSCs within a visited radio telecommunications network in which a mobile subscriber is roaming.
  • the method comprises the steps of associating a roamer port number with a plurality of MSCs within the visited radio telecommunications network, simultaneously paging for the roaming mobile subscriber within each of the associated plurality of MSCs upon receipt of a call for the mobile subscriber through the roamer port number, and routing the call to one of the plurality of associated MSCs in which a successful page response is received.
  • the step of simultaneously paging for the roaming mobile subscriber within each of the associated plurality of MSCs may include the steps of simultaneously placing calls by seizing trunks to each of the associated plurality of MSCs upon receipt of the call for the roaming mobile subscriber, and instructing each of the associated plurality of MSCs to simultaneously page for the roaming mobile subscriber.
  • the step of simultaneously paging for the roaming mobile subscriber within each of the associated plurality of MSCs may include utilizing, within the first MSC, network signaling messages to notify each of the associated plurality of MSCs that the call is a roamer port call and to instruct each of the associated plurality of MSCs to page for the roaming mobile subscriber.
  • FIG. 1 is a high level block diagram of two existing radio telecommunications networks between which mobile subscribers may roam;
  • FIG. 2 is a flow chart illustrating the steps involved in the process of extending the coverage area of a roamer port number from a single mobile switching center
  • FIG. 3 is a flow chart illustrating the steps involved in the process of extending the coverage area of a roamer port number from a single MSC to multiple MSCs within a visited network in a second embodiment of the present invention
  • FIG. 4 is a simplified block diagram of a radio telecommunications network suitable for implementing the present invention.
  • FIG. 5 is a simplified block diagram of a MSC illustrating the additional functions added to an existing
  • FIG. 6 is a simplified block diagram of a MSC illustrating the additional functions added to an existing
  • FIG. 1 is a high level block diagram of two existing radio telecommunications networks between which mobile subscribers may roam.
  • Network-1 (10) may include, by way of example, a first home location register (HLR-1) 11 and a plurality of mobile switching centers (MSCs) such as MSC-1 (12) and MSC-2 (13) .
  • Network-2 (14) may include a second home location register (HLR-2) 15 and a plurality of MSCs such as MSC-3 (16) , MSC-4 (17) and MSC-5 (18) .
  • a Subscriber-A (Sub-A) 19, whose home network is Network-1 (10) may roam from Network-1 (10) to Network-2 (14) .
  • Sub-A may then desire to receive telephone calls originating from within the geographic area serviced by Network-2, and may wish to receive such calls without long distance charges accruing to either Sub-A or local calling parties.
  • the MSCs within Network-2 are modified so that the area covered by a roamer port number may be defined by the network operator.
  • the area definition is saved in one of the network MSCs.
  • Roamer Port Number X may be defined in MSC-3, and may cover the service areas of MSC-3, MSC-4, and MSC-5.
  • Sub-A is paged in all three MSCs (MSC-3, MSC-4, and MSC-5) after Roamer Port Number X is dialed and Sub-A is dialed.
  • MSC-3 When a call comes in on the roamer port number, MSC-3 pages Sub-A 19 in the service area of MSC-3. At the same time, MSC-3 instructs MSC-4 and MSC-5 to page for Sub-A in their respective service areas since the service areas of MSC-4 and MSC-5 are also covered by the roamer port number.
  • MSC-3 simultaneously places calls to MSC-4 and MSC-5 by seizing trunks 21 to MSC-4 and MSC-5.
  • MSC-3 may add a prefix to Sub-A's Subscriber Number (SNB) (for example #26) and send the prefix and SNB to MSC-4 and MSC-5.
  • SNB Subscriber Number
  • the prefix identifies the call to the SNB as a roamer port call, and instructs MSC-4 and MSC-5 to page for Sub-A in their service areas. MSC-4 and MSC-5 then remove the prefix and page for Sub-A in their respective service areas. Thus, Sub-A is paged in all three Network-2 MSCs at the same time. If a successful page response is received from Sub-A in either
  • the call is completed to the mobile station.
  • the originating MSC (MSC-3) then clears the call
  • MSC-3 instructs MSC-4 and
  • MSC-5 to page for Sub-A in their respective service areas through network signaling messages rather than seizing trunks.
  • MSC-3 may be modified to send Routing Request (RouteReq) Invoke messages to both MSC-4 and MSC-5.
  • the RouteReq messages include an indicator that the call is a roamer port call.
  • MSC-4 and MSC-5 page for Sub-A in their respective service areas.
  • Sub-A is paged in all three Network-2 MSCs at the same time. If a successful page response is received from Sub- A by one of the MSCs, the successful MSC notifies the originating MSC where paging is halted. Thereafter, the call is routed locally to the successful MSC and Sub-A.
  • the coverage area of a roamer port number is extended from a single MSC to multiple MSCs within a visited network.
  • the probability of successfully completing each call is greatly increased over existing systems which page for roaming mobile subscribers only in a single MSC where the roamer port number is defined.
  • the system of the present invention is implemented locally in the visited network. There is no requirement for long distance HLR interrogation. This reduces the administrative overhead burden of having to update tables associating HLRs with every roaming mobile subscriber that enters the visited network.
  • FIG. 2 is a flow chart illustrating the steps involved in the process of extending the coverage area of a roamer port number from a single MSC to multiple MSCs within a visited network in a first embodiment of the present invention.
  • the Network-2 operator defines Roamer Port Number-X in MSC-3 to cover the service areas of MSC-3, MSC-4, and MSC-5.
  • Sub-A 19 roams from Network-1 to Network-2.
  • an incoming call for Sub-A 19 is received on Roamer Port Number-X in MSC-3 in Network-2.
  • the process then moves to step 34 where MSC-3 begins to page for Sub-A in the MSC-3 service area and simultaneously places calls to MSC- 4 and MSC-5 by seizing trunks 21.
  • MSC-3 adds a prefix to Sub-A' s SNB and sends the modified SNB to both MSC-4 and MSC-5.
  • the process then moves to step 36 where MSC-3, MSC-4, and MSC-5 all page for Sub-A 19 at the same time .
  • step 37 it is determined whether or not a successful page response was received from any of the paging MSCs. If not, then the process moves to step 38 where MSC-4 and MSC-5 notify MSC-
  • step 39 MSC-3 notifies the calling party that Sub-A was not found. If, however, a successful page response was received at step 37, then the process moves to step
  • the MSC with the successful page response notifies the originating MSC (MSC-3) of the response, and the call is completed to Sub-A 19.
  • the originating MSC (MSC-3) then clears the call (trunk) to the unsuccessful MSC at 41.
  • FIG. 3 is a flow chart illustrating the steps involved in the process of extending the coverage area of a roamer port number from a single MSC to multiple MSCs within a visited network in a second embodiment of the present invention.
  • the Network-2 operator defines Roamer Port Number-X in MSC-3 to cover the service areas of MSC-3, MSC-4, and MSC-5.
  • Sub-A 19 roams from Network-1 to Network-2.
  • an incoming call for Sub-A 19 is received on Roamer Port Number-X in MSC-3 in Network-2.
  • MSC-3 begins to page for Sub-A in the MSC-3 service area and simultaneously sends intersystem signaling messages to MSC-4 and MSC-5 instructing MSC-4 and MSC-5 to page for Sub-A in their respective service areas.
  • MSC-3 may be modified to send Routing Request (RouteReq) Invoke messages to both MSC-4 and MSC-5.
  • the RouteReq messages include an indicator that the call is a roamer port call .
  • step 57 it is determined whether or not a successful page response was received from any of the paging MSCs. If not, MSC-4 and MSC-5 notify MSC-3 that Sub-A was not found at step 58. MSC-4 and MSC-5 may send RouteReq Return Result messages to MSC-3 indicating that Sub-A was not found. The process then moves to step 59 where MSC-3 notifies the calling party that Sub-A was not found. If, however, a successful page response was received at step 57, then the process moves to step 60 where the MSC with the successful page response notifies the originating MSC (MSC-3) of the response, and paging is halted. Finally, the process moves to step 61 where the call is routed locally to the successful MSC and Sub-A 19.
  • FIG. 4 is a simplified block diagram of a radio telecommunications network 70 suitable for implementing the present invention.
  • a HLR 71 is connected by signaling links 72 to MSC-3 (73), MSC-4 (74), and MSC-5 (75) .
  • MSC-3 may establish multiple voice trunks 76 to MSC-4 and MSC-5.
  • MSC-3 is modified to define a roamer port number to cover the service areas of MSC-3, MSC-4, and MSC-5.
  • MSC-3 is also modified to add a prefix to any SNB which is called through the roamer port .
  • FIG. 1 is a simplified block diagram of a radio telecommunications network 70 suitable for implementing the present invention.
  • a HLR 71 is connected by signaling links 72 to MSC-3 (73), MSC-4 (74), and MSC-5 (75) .
  • MSC-3 may establish multiple voice trunks 76 to MSC-4 and MSC-5.
  • MSC-3 is modified to define a roamer port number to cover the service areas
  • FIG. 5 is a simplified block diagram of a MSC (for example MSC-3) illustrating the additional functions added to an existing MSC in order to define and implement an extended roamer port in accordance with the teachings of the present invention.
  • the roamer port number is defined in MSC-3 to cover the service areas of MSC-3, MSC-4, and MSC-5 in instruction block 81.
  • Instruction block 82 identifies roamer port calls by adding a prefix (for example #26) to any SNB which is called through the roamer port.
  • Instruction block 83 enables MSC-3 to simultaneously place calls to other MSCs by seizing multiple voice trunks to other MSCs covered in the roamer port definition in block 81.
  • Instruction block 84 enables MSC-3 to direct the paging of a mobile station within the service area of MSC-3 while MSC-4 and MSC-5 also page for the mobile station. Finally, instruction block 85 enables MSC-3 to order MSC-4 and MSC-5 to stop paging if MSC-3 is the first MSC to receive a page response from the mobile station. The call is then delivered to MSC-3 and the mobile station.
  • FIG. 6 is a simplified block diagram of a MSC (for example MSC-4) illustrating the additional functions add with the MSC of FIG. 5 and thereby implement an extended roamer port in accordance with the teachings of the present invention.
  • MSC-4 receives a SNB from MSC-3 with a prefix added to the SNB
  • instruction block 91 enables MSC-4 to recognize the call as a roamer port call, and instructs MSC-4 to page for the associated mobile station within the service area of MSC-4 utilizing paging mechanism 92.
  • instruction block 93 enables MSC-4 to notify the originating MSC (for example MSC-3) . The call is then delivered to MSC-4 and the mobile station.

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

Abstract

Système et procédé servant à étendre la couverture d'accès hors secteur local depuis un centre unique de commutation mobile (MSC) vers une pluralité de centres de commutation mobile associés (MSC) à l'intérieur d'un réseau de télécommunications radio visité (70) dans lequel un abonné mobile (19) effectue un appel hors secteur local. Dans un premier centre de commutation mobile (MSC) (73), un numéro d'accès hors secteur local est défini afin de couvrir la pluralité associée de centres de commutation mobile (MSC) (74, 75) à l'intérieur du réseau de télécommunications radio visité (70). Quand un appel est reçu par l'intermédiaire du numéro d'accès non local pour l'abonné mobile (19) communiquant hors secteur local, le premier centre de commutation mobile (MSC) transmet des appels simultanément en occupant des lignes réseau (76) vers chaque centre de commutation mobile dans la pluralité de MSC (74, 75) et commande à chacun de ces centres de commutation mobile de rechercher simultanément l'abonné mobile (19) communiquant hors secteur local. Dans un autre mode de réalisation, le premier centre de commutation mobile (MSC) peut éventuellement utiliser des messages de signalisation de réseau afin d'informer chacun des centres de commutation mobile dans la pluralité associée de MSC (74, 75) que l'appel est un appel hors secteur local, et de commander à chaque MSC de rechercher l'abonné mobile (19) communiquant hors secteur local. A réception d'une réponse satisfaisante de recherche dans un des centres de commutation mobile (MSC) en cours de recherche, l'appel est acheminé vers le centre de commutation mobile (MSC) possédant la réponse satisfaisante.
PCT/SE1997/000811 1996-05-30 1997-05-16 Systeme et procede servant a transmettre des appels hors secteur local dans des centres de commutation multiples de telecommunications radio WO1997046043A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR9709480A BR9709480A (pt) 1996-05-30 1997-05-16 Sistema e processo para estender a cobertura de porto de chamada de visitante de um único centro de comutação móvel para uma pluralidade de centros de comutação móvel dentro de uma rede de rádio telecomunicações visitada e processo para fazer uma chamada para um assinante móvel circulando dentro de uma rede de rádio telecomunicações visitada
CA002255847A CA2255847C (fr) 1996-05-30 1997-05-16 Systeme et procede servant a transmettre des appels hors secteur local dans des centres de commutation multiples de telecommunications radio
AU30518/97A AU3051897A (en) 1996-05-30 1997-05-16 System and method of delivering roamer port calls in multiple radio telecommunication switches

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65545196A 1996-05-30 1996-05-30
US08/655,451 1996-05-30

Publications (2)

Publication Number Publication Date
WO1997046043A2 true WO1997046043A2 (fr) 1997-12-04
WO1997046043A3 WO1997046043A3 (fr) 1998-01-22

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PCT/SE1997/000811 WO1997046043A2 (fr) 1996-05-30 1997-05-16 Systeme et procede servant a transmettre des appels hors secteur local dans des centres de commutation multiples de telecommunications radio

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Country Link
AU (1) AU3051897A (fr)
BR (1) BR9709480A (fr)
CA (1) CA2255847C (fr)
WO (1) WO1997046043A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053711A1 (fr) * 1998-04-14 1999-10-21 Telefonaktiebolaget Lm Ericsson (Publ) Gestion de terminaison locale d'appel dans un reseau de radiotelecommunication
US6424832B1 (en) 1999-04-29 2002-07-23 Telefonaktiebolaget L M Ericsson (Publ) Method of supporting functionality for roamer port calls in a radio telecomminications network in which number portability is implemented

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5153902A (en) * 1990-04-27 1992-10-06 Telefonaktiebolaget L M Ericsson Multi-exchange paging system for locating a mobile telephone in a wide area telephone network
US5479484A (en) * 1994-05-31 1995-12-26 At&T Corp. Method and apparatus for facilitating the making of wireless telephone calls

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999053711A1 (fr) * 1998-04-14 1999-10-21 Telefonaktiebolaget Lm Ericsson (Publ) Gestion de terminaison locale d'appel dans un reseau de radiotelecommunication
US6424832B1 (en) 1999-04-29 2002-07-23 Telefonaktiebolaget L M Ericsson (Publ) Method of supporting functionality for roamer port calls in a radio telecomminications network in which number portability is implemented

Also Published As

Publication number Publication date
BR9709480A (pt) 1999-08-10
WO1997046043A3 (fr) 1998-01-22
CA2255847C (fr) 2005-07-19
AU3051897A (en) 1998-01-05
CA2255847A1 (fr) 1997-12-04

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