CA2155060C - System for call forwarding from a first communication network to a second remote communication network and a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network - Google Patents
System for call forwarding from a first communication network to a second remote communication network and a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network Download PDFInfo
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- CA2155060C CA2155060C CA002155060A CA2155060A CA2155060C CA 2155060 C CA2155060 C CA 2155060C CA 002155060 A CA002155060 A CA 002155060A CA 2155060 A CA2155060 A CA 2155060A CA 2155060 C CA2155060 C CA 2155060C
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- communication network
- mobile
- bridgehead
- network
- gsm
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Classifications
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber
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- 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
- H04W8/08—Mobility data transfer
- H04W8/12—Mobility data transfer between location registers or mobility servers
Abstract
Disclosed is a system for call forwarding from a first communication network to a second remote communication network, whereby the second communication network is one of several GSM-type mobile-communication network. The system comprises a bridgehead located in the area of the first communication network, the bridgehead serving as an internetwork junction between the first communication network and the second communication networks (transition network). Calling numbers of the first communication network are assigned to the bridgehead to which calling numbers of the first communication network are assignable by call forwarding, the calling numbers being converted to GSM-type calling numbers in the bridgehead. The bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels and provides the basic services of subscribers of a GSM-type mobile-communication network.
Description
' 21 5506 0 A System for Call Forwarding from a first Communication Network to a second remote Communication Network and a System for virtual Extension of a Mobile Communication Network by at least a second, remote Mobile Communication Network Field of the Invention The invention relates to a system for call forwarding from a first communication network to a second remote communication network, whereby the second communication network is one of several mobile communication networks of the GSM type (Global System for Mobile Communications).
The invention relates as well to a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network, whereby the second communication network is one of several mobile communication networks of the GSM type (Global System for Mobile Communications?.
Background of Invention Digital mobile communication networks of the GSM type, standardized by the European Telecommunications Standards Institute (ETSI), have been or will be installed in almost 2~ 55o s o all European countries and also in a rising number of East European, Asian and African countries and in Australia.
An important characteristic of the GSM standard is that in a GSM mobile communication network a subscriber has the possibility to use the services of another GSM network as a temporary subscriber (International Roaming). However this requires an agreement between the operators of the related mobile communication networks. Generally it is not possible for subscribers of not-GSM standard mobile communication networks to use services of GSM mobile communication networks or services of other mobile communication networks.
Summary of the Invention It is the object of the invention to provide the possibility to virtually extend mobile communication networks not working under the GSM standard by using GSM mobile communication networks.
The problem is according to a first main embodiment solved by providing a bridgehead in the first communication network which serves as an internetwork junction between a first communication network and one of the GSM networks (transition network), whereby calling numbers of the first communication network are assigned to the bridgehead to which further calling numbers of the first communication network are assignable by call forwarding. In the bridgehead also occurs a conversion into GSM calling numbers, which bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signaling channels and intelligence signal channels and also incorporates the basic services for subscribers of a GSM
mobile communication network.
The system according to the invention not only enables subscribers of other mobile communication networks to use a GSM mobile communication network but also enables them to use all GSM mobile communication networks without further requirements under condition that the operators have made a so called roaming agreement.
In a preferred embodiment of the invention it is possible by booking a service according to the invention that by providing call forwarding in the first communication network a GSM calling number is assigned to the calling number which can be reached by the call forwarding in the bridgehead.
The corresponding GSM calling number is routed to and saved in a subscriber register (Home Location Register, HLR) of the transition network.
The invention relates as well to a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network, whereby the second communication network is one of several mobile communication networks of the GSM type (Global System for Mobile Communications?.
Background of Invention Digital mobile communication networks of the GSM type, standardized by the European Telecommunications Standards Institute (ETSI), have been or will be installed in almost 2~ 55o s o all European countries and also in a rising number of East European, Asian and African countries and in Australia.
An important characteristic of the GSM standard is that in a GSM mobile communication network a subscriber has the possibility to use the services of another GSM network as a temporary subscriber (International Roaming). However this requires an agreement between the operators of the related mobile communication networks. Generally it is not possible for subscribers of not-GSM standard mobile communication networks to use services of GSM mobile communication networks or services of other mobile communication networks.
Summary of the Invention It is the object of the invention to provide the possibility to virtually extend mobile communication networks not working under the GSM standard by using GSM mobile communication networks.
The problem is according to a first main embodiment solved by providing a bridgehead in the first communication network which serves as an internetwork junction between a first communication network and one of the GSM networks (transition network), whereby calling numbers of the first communication network are assigned to the bridgehead to which further calling numbers of the first communication network are assignable by call forwarding. In the bridgehead also occurs a conversion into GSM calling numbers, which bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signaling channels and intelligence signal channels and also incorporates the basic services for subscribers of a GSM
mobile communication network.
The system according to the invention not only enables subscribers of other mobile communication networks to use a GSM mobile communication network but also enables them to use all GSM mobile communication networks without further requirements under condition that the operators have made a so called roaming agreement.
In a preferred embodiment of the invention it is possible by booking a service according to the invention that by providing call forwarding in the first communication network a GSM calling number is assigned to the calling number which can be reached by the call forwarding in the bridgehead.
The corresponding GSM calling number is routed to and saved in a subscriber register (Home Location Register, HLR) of the transition network.
21550fi0 An important commercial application of the system according to the invention is seen in the communication between the USA and Europe or other GSM countries.
For this purpose a bridgehead has to be installed in the USA
which is connected via a direct line to a Gateway Mobile Services Switching Center (GMSC) in Europe, which is for example part of the German D1 mobile communication network.
A traveler from the USA commissions the US mobile communication operator to assign his calling number to a number of the bridgehead by call forwarding during his absence. So he will be within call under his usual calling number during his trip to Europe.
Before his trip or before he set out the trip he will get a Mobile Subscriber calling number (MSISDN) which is a number of the European GSM network which will be enabled latest on his arrival in Europe. He also will get a mobile phone.
The traveler may now be reached under his usual calling number without having to present his temporary domicile.
The system according to the invention has also the advantage that multiple services of the GSM network can be used without requiring further steps. During connection buildup it is just necessary to exchange signaling information via the data connection.
For this purpose a bridgehead has to be installed in the USA
which is connected via a direct line to a Gateway Mobile Services Switching Center (GMSC) in Europe, which is for example part of the German D1 mobile communication network.
A traveler from the USA commissions the US mobile communication operator to assign his calling number to a number of the bridgehead by call forwarding during his absence. So he will be within call under his usual calling number during his trip to Europe.
Before his trip or before he set out the trip he will get a Mobile Subscriber calling number (MSISDN) which is a number of the European GSM network which will be enabled latest on his arrival in Europe. He also will get a mobile phone.
The traveler may now be reached under his usual calling number without having to present his temporary domicile.
The system according to the invention has also the advantage that multiple services of the GSM network can be used without requiring further steps. During connection buildup it is just necessary to exchange signaling information via the data connection.
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In a further embodiment of the invention the bridgehead is prepared to handle the Message Authentication Protocol (MAP) under the GSM standard. The bridgehead in the transition network operates therefor as a Gateway Mobile Services Switching Center (GMSC).
It is of particular advantage when the first communication network is also a mobile communication network.
In still a further embodiment of the invention it is intended that the bridgehead comprises means for storing and restoring voice signals (Voice Mail System) in the area of the first communication network. Voice signals from the first and the second communication system can be stored/restored in such a Voice Mail System.
This improves the communication between a subscriber of the first communication network and a temporary subscriber of the GSM network e.g. because of the time shift between the continents.
In still a further embodiment the bridgehead in the first communication network comprises a speech memory with announcement messages stored therein. This may help a subscriber to get important information about the call transfer in case he was not well informed before.
In a further embodiment of the invention the bridgehead is prepared to handle the Message Authentication Protocol (MAP) under the GSM standard. The bridgehead in the transition network operates therefor as a Gateway Mobile Services Switching Center (GMSC).
It is of particular advantage when the first communication network is also a mobile communication network.
In still a further embodiment of the invention it is intended that the bridgehead comprises means for storing and restoring voice signals (Voice Mail System) in the area of the first communication network. Voice signals from the first and the second communication system can be stored/restored in such a Voice Mail System.
This improves the communication between a subscriber of the first communication network and a temporary subscriber of the GSM network e.g. because of the time shift between the continents.
In still a further embodiment the bridgehead in the first communication network comprises a speech memory with announcement messages stored therein. This may help a subscriber to get important information about the call transfer in case he was not well informed before.
The announcements may for example inform the subscriber that his call is transferred to another continent. The subscriber may then decide to continue or to stop his call depending on the importance of the call. , In above described embodiment the stored announcements may be recalled during calls from the first communication network dependent of signals from the second communication network. That way the subscriber will get additional information e.g. information about the time shift between the place of calling and the place of the temporary GSM
subscriber. The place of the temporary GSM subscriber is stored in the GSM network as soon as the temporary GSM
subscriber has logged in one of the GSM mobile-communication networks.
According to the invention, there is provided a system for call forwarding from a first communication network to a second remote communication network, whereby the second communication network is one of several GSM-type mobile-communication network. The system comprises a bridgehead located in the area of the first communication network, the bridgehead serving as a internetwork junction between the first communication network and the second communication networks (transition network). Calling numbers of the first communication network are assigned to the bridgehead to which calling numbers of the first communication network are assignable by call forwarding, the calling numbers being converted to GSM-type calling numbers in the bridgehead. The bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels and provides the basic services of subscribers of a GSM-type mobile-communication network.
This first main embodiment discloses a system for call forwarding from a first communication network to a second remote.communication network by means of a bridgehead, wherein the calling numbers of the first communication network are assigned to the bridgehead.
According to the invention, there is also provided a system for virtual extension of a mobile-communication network by at least a second, remote mobile-communication network, wherein one of communication network is of the GSM type.
The system comprises a bridgehead between the first and second mobile-communication network. The bridgehead serves as a internetwork junction to one of the mobile-communication networks of the GSM type (transition network). The bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels. The bridgehead acts as Visitor Location Register for another mobile-communication network, and as a Home Location Register for the transition network if a subscriber of the other mobile-communication network is in the range of the mobile-communication networks of the GSM type. The bridgehead acts as a Home Location Register for the other mobile-communication network, and as a Visitor Location Register for the transition network if a subscriber of the mobile-communication networks of the GSM type is in the range of the other mobile-communication network.
The bridgehead may be capable of conducting a Mobile Management Protocol, according to the GSM-standard.
Specifically, the bridgehead may be capable of conducting a Mobile Application Part of the Mobile Management Protocol.
The bridgehead may be provided with means for storing and restoring voice signals (Voice Mail System), and the voice signals from the transition network and the another mobile-communication network may be storable in the Voice Mail System. Voice signals stored in said Voice Mail System can be recalled through the transition network and the at least another mobile-communication network.
7a The bridgehead may comprise a speech memory for storing announcements, wherein the stored announcements may be recallable during calls from the transition network, depending on signals from the as least another mobile-communication network and vice-versa.
Brief description of the drawings The invention will now be further described by way of the accompanying drawings.
Figure 1: shows a schematic representation of the system according to the first main embodiment and the communication networks connected therewith;
Figure 2: shows the same system schematically representing the connection buildup for call transferring between as US mobile communication network and the German D1 mobile communication network;
Figure 3: shows a call transfer to a Voice Mail System;
Figure 4: shows a call transfer to a subscriber of another 7b GSM communication network than the D1 network.
Figure 5: shows the connection buildup from a fixed telephone network in Europe where the call is transferred to the Voice Mail System of the bridgehead because the temporary GSM subscriber is not on-line, Figure 6: the system according to the first main embodi-ment with corresponding administration, Figure 7: a bridgehead between several mobile communication networks PLMN X, PLMN Y and PLMN Z
respectively, in accordance with the second main embodiment, and Figure 8: a bridgehead with signaling and operating traffic between two selected mobile communication networks PLMN X and PLMN Y.
In the drawings same references indicate the same parts.
The references 1 to 9 in drawing figures 2 to 5 are used to indicate a sequence of different activities wherein the same numbers do not always indicate the same activity.
subscriber. The place of the temporary GSM subscriber is stored in the GSM network as soon as the temporary GSM
subscriber has logged in one of the GSM mobile-communication networks.
According to the invention, there is provided a system for call forwarding from a first communication network to a second remote communication network, whereby the second communication network is one of several GSM-type mobile-communication network. The system comprises a bridgehead located in the area of the first communication network, the bridgehead serving as a internetwork junction between the first communication network and the second communication networks (transition network). Calling numbers of the first communication network are assigned to the bridgehead to which calling numbers of the first communication network are assignable by call forwarding, the calling numbers being converted to GSM-type calling numbers in the bridgehead. The bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels and provides the basic services of subscribers of a GSM-type mobile-communication network.
This first main embodiment discloses a system for call forwarding from a first communication network to a second remote.communication network by means of a bridgehead, wherein the calling numbers of the first communication network are assigned to the bridgehead.
According to the invention, there is also provided a system for virtual extension of a mobile-communication network by at least a second, remote mobile-communication network, wherein one of communication network is of the GSM type.
The system comprises a bridgehead between the first and second mobile-communication network. The bridgehead serves as a internetwork junction to one of the mobile-communication networks of the GSM type (transition network). The bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels. The bridgehead acts as Visitor Location Register for another mobile-communication network, and as a Home Location Register for the transition network if a subscriber of the other mobile-communication network is in the range of the mobile-communication networks of the GSM type. The bridgehead acts as a Home Location Register for the other mobile-communication network, and as a Visitor Location Register for the transition network if a subscriber of the mobile-communication networks of the GSM type is in the range of the other mobile-communication network.
The bridgehead may be capable of conducting a Mobile Management Protocol, according to the GSM-standard.
Specifically, the bridgehead may be capable of conducting a Mobile Application Part of the Mobile Management Protocol.
The bridgehead may be provided with means for storing and restoring voice signals (Voice Mail System), and the voice signals from the transition network and the another mobile-communication network may be storable in the Voice Mail System. Voice signals stored in said Voice Mail System can be recalled through the transition network and the at least another mobile-communication network.
7a The bridgehead may comprise a speech memory for storing announcements, wherein the stored announcements may be recallable during calls from the transition network, depending on signals from the as least another mobile-communication network and vice-versa.
Brief description of the drawings The invention will now be further described by way of the accompanying drawings.
Figure 1: shows a schematic representation of the system according to the first main embodiment and the communication networks connected therewith;
Figure 2: shows the same system schematically representing the connection buildup for call transferring between as US mobile communication network and the German D1 mobile communication network;
Figure 3: shows a call transfer to a Voice Mail System;
Figure 4: shows a call transfer to a subscriber of another 7b GSM communication network than the D1 network.
Figure 5: shows the connection buildup from a fixed telephone network in Europe where the call is transferred to the Voice Mail System of the bridgehead because the temporary GSM subscriber is not on-line, Figure 6: the system according to the first main embodi-ment with corresponding administration, Figure 7: a bridgehead between several mobile communication networks PLMN X, PLMN Y and PLMN Z
respectively, in accordance with the second main embodiment, and Figure 8: a bridgehead with signaling and operating traffic between two selected mobile communication networks PLMN X and PLMN Y.
In the drawings same references indicate the same parts.
The references 1 to 9 in drawing figures 2 to 5 are used to indicate a sequence of different activities wherein the same numbers do not always indicate the same activity.
Description of the preferred embodiments Figure 1 shows a bridgehead 11 situated in the USA which is connected with a mobile communication network 12 in the USA
via lines 13 comprising signaling channels, indicated by dotted lines, and intelligence signal channels, indicated by solid lines. The bridgehead 11 is connected to a Mobile Services Switching Center (MSC) 15 in Europe, for example in Frankfurt/M., Germany, via a transatlantic connection 14 which also comprises signaling and intelligence signal channels. The MSC comprises also a Visitor Location Register (VLR) .
The Mobile Services Switching Center (MSC) 15 has access to a Virtual Home Location Register (VHLR) 17 which serves also as a authentication center. The MSC i5 is further connected to a MSC 19 in which the temporary GSM subscriber 20 is allocated at the moment, via lines 18. This Mobile Services Switching Center is therefore also called Visitors Mobile Services Switching Center VMSC. The VMSC 19 may be part of the same mobile communication network as the MSC 15 - herein described as D1 network - or may be part of another GSM
mobile communication network which cooperates with said network on basis of a roaming agreement.
via lines 13 comprising signaling channels, indicated by dotted lines, and intelligence signal channels, indicated by solid lines. The bridgehead 11 is connected to a Mobile Services Switching Center (MSC) 15 in Europe, for example in Frankfurt/M., Germany, via a transatlantic connection 14 which also comprises signaling and intelligence signal channels. The MSC comprises also a Visitor Location Register (VLR) .
The Mobile Services Switching Center (MSC) 15 has access to a Virtual Home Location Register (VHLR) 17 which serves also as a authentication center. The MSC i5 is further connected to a MSC 19 in which the temporary GSM subscriber 20 is allocated at the moment, via lines 18. This Mobile Services Switching Center is therefore also called Visitors Mobile Services Switching Center VMSC. The VMSC 19 may be part of the same mobile communication network as the MSC 15 - herein described as D1 network - or may be part of another GSM
mobile communication network which cooperates with said network on basis of a roaming agreement.
21550fi 0 A Voice Mail System 21 and a speech memory for announcements 22 are connected to the bridgehead 11. Within the mobile communication network 12 the calling numbers have the structure shown in Figure 1. A call for the calling number "+1 abc defghij" reaches a connection of the bridgehead with the number "+1 212 klmnopq". This number is converted to a calling number of the D1 network in the form "+49 171 rstuvwx".
In Figure 2 an arrow 1 indicates the call forwarding from the mobile communication network 12 in the USA to the bridgehead 11. The bridgehead then sends an interrogation 2 to the MSC 15 which transfers the interrogation 2 in form of an interrogation 3 to the Virtual Home Location Register 17 in which the MSISDN number "+49 171 rstuvwx" of the temporary GSM subscriber is stored. The Virtual HLR 17 further includes the address of the Visitor Location Register VLR of the VMSC 19. As indicated by 4 the so called roaming number is questioned from the VMSC 19 which is then transferred into the Virtual Home Location Register as indicated by 5. The roaming number is then transferred to the Mobile Services Switching Center 15 as indicated by 6 and then transferred to the bridgehead 11 as indicated by 7.
The bridgehead 11 causes the routing of the connection to the Mobile Services Switching center 15 as indicated by 8 2~55oso and also to the VMSC 19 as indicated by 9 and finally to the temporary GSM subscriber 20.
Figure 3 shows the case where the same interrogation is used as described in connection with Figure 2. However, the virtual Home Location Register 17 does not contain a address of a Visitor Location Register but contains a instruction for a Conditional Call Forwarding CFC to the Voice Mail System 21. This instruction is transferred to the MSC 15 and also to the bridgehead as indicated by 4 and 5, respectively. Therein the call is transferred to the Voice Mail System where the Voice signals can be recorded and played back.
Figure 4 shows a call forwarding in the case that the temporary GSM subscriber uses another mobile communication network than the D1 network. The call forwarding occurs in the same way as described in connection with Figure 2. The Home Location Register 17 just contains the address of a Virtual Location Register of another GSM mobile communication network to which the call is routed as explained in connection with Figure 2. The temporary GSM
subscriber may be called out of a fixed network of the same or any other GSM mobile communication network. Also he may use the services as a calling subscriber, especially within ' 215506 0 the mobile communication network, to other mobile communication networks or to any fixed network.
In case the temporary GSM subscriber is off-line or can not be reached a call forwarding to a Voice mail System 21 in the USA can be effected as described below. A subscriber 31 of a fixed network 32 dials the calling number of the temporary GSM subscriber (not shown in Figure 5). The call is routed to the virtual Home Location Register 17 via a Gateway MSC 33 (arrows 1 and 2). There will be detected that there is no Visitor Location Register Address (VLR-Address), because the subscriber is obviously not within reach. The Virtual Home Location Register 17 contains the instruction for a conditional call forwarding to the Voice Mail System 21. The steps 3, 4 and 5 are now executed in the same way than the steps 4,5 and 6 described in connection with Figure 3. The subscriber 31 may leave or play back a message using the Voice Mail System.
Figure 6 shows the system according to Figure 1 with a administration unit 34, which is connected via telephone and facsimile lines 35 - 39 with the mobile communication network 12 in the USA, the bridgehead 11, and the subscriber administration 40 of the GSM mobile communication network.
If there is a order for arranging a call forwarding the administration unit 34 informs and controls the concerned networks and network elements. There is established a call forwarding to the bridgehead 11 in the mobile communication network 12 and the subscriber administration 40 enables the calling number for the temporary GSM subscriber. The bridgehead 11 assigns this calling number to the calling number which is reached in the US mobile communication network 12 by call forwarding. The connections are canceled at termination of the temporary GSM subscriber contract.
The second main embodiment according to claim 11 is described with reference to Fig. 7 and 8.
The mobile communication networks PLMN X and PLMN Z, referred to as 41, 41' respectively, are networks not in accordance with GSM standards, while mobile communication network PLMN Y, referred to as 51, is of GSM type. Between these networks there is provided a bridgehead 60.
Fig. 8 shows the interaction between two selected networks, wherein network PLMN X 1 is a network of AMPS type. Both networks PLMN X and PLMN Y are connected via signaling channels.
The HLR 42 of a subscriber 5 of network PLMN X is located in network PLMN X. The bridgehead has the following tasks: He retrieves the necessary data of said subscriber of network 11 from the HLR 42, in particular his Mobile Identification Number.(MIN) and his Mobile Serial Number (MSN).
Accordingly, in the network PLMN X the bridgehead acts as a VLR 61.
The AMPS subscriber information is then converted to GSM
subscriber information, in particular MIN and MSN are converted to International Mobile Subscriber Identity (IMSI) and to Mobile Station International ISDN Number. This conversion is assisted by a local conversion data base.
The produced GSM subscriber information is now present in the bridgehead who is now acting as HLR 62 for network PLMN
Y 51. If the subscriber 45 is located in the range of network PLMN Y he may be inserted in a VLR 53 as if he were a subscriber of network PLMN Y. His virtual subscriber information are called from the bridgehead acting as HLR 62.
The process is reversed for a subscriber 55 of network PLMN
Y 51 located in the range of network PLMN X 41. His information is called form HLR 52 of network PLMN Y and transferred to the bridgehead (VLR 65). The GSM subscriber information is converted to AMPS subscriber information, assisted by a local conversion data base. Afterwards, the subscriber information is transferred to network PLMN X 41 (HLR 64). Subscriber 15 may be inserted in a VLR 53 of network PLMN X; his subscriber information may be called from said bridgehead (HLR 64).
Additionally, said bridgehead 60 may not only attend to signalisation between the incompatible networks 41, 51, but also to traffic channels. Accordingly, there are provided connections between operating points GMSC 44 of network PLMN
X and GMSC 54 of network PLMN Y via a protocol converter 76 of said bridgehead. Conversion 68 occurs between different transmitting systems, in particular a conversion from European ITU-T protocols (PCM 30) to US ANSI protocols (PCM24) and vice versa.
In Figure 2 an arrow 1 indicates the call forwarding from the mobile communication network 12 in the USA to the bridgehead 11. The bridgehead then sends an interrogation 2 to the MSC 15 which transfers the interrogation 2 in form of an interrogation 3 to the Virtual Home Location Register 17 in which the MSISDN number "+49 171 rstuvwx" of the temporary GSM subscriber is stored. The Virtual HLR 17 further includes the address of the Visitor Location Register VLR of the VMSC 19. As indicated by 4 the so called roaming number is questioned from the VMSC 19 which is then transferred into the Virtual Home Location Register as indicated by 5. The roaming number is then transferred to the Mobile Services Switching Center 15 as indicated by 6 and then transferred to the bridgehead 11 as indicated by 7.
The bridgehead 11 causes the routing of the connection to the Mobile Services Switching center 15 as indicated by 8 2~55oso and also to the VMSC 19 as indicated by 9 and finally to the temporary GSM subscriber 20.
Figure 3 shows the case where the same interrogation is used as described in connection with Figure 2. However, the virtual Home Location Register 17 does not contain a address of a Visitor Location Register but contains a instruction for a Conditional Call Forwarding CFC to the Voice Mail System 21. This instruction is transferred to the MSC 15 and also to the bridgehead as indicated by 4 and 5, respectively. Therein the call is transferred to the Voice Mail System where the Voice signals can be recorded and played back.
Figure 4 shows a call forwarding in the case that the temporary GSM subscriber uses another mobile communication network than the D1 network. The call forwarding occurs in the same way as described in connection with Figure 2. The Home Location Register 17 just contains the address of a Virtual Location Register of another GSM mobile communication network to which the call is routed as explained in connection with Figure 2. The temporary GSM
subscriber may be called out of a fixed network of the same or any other GSM mobile communication network. Also he may use the services as a calling subscriber, especially within ' 215506 0 the mobile communication network, to other mobile communication networks or to any fixed network.
In case the temporary GSM subscriber is off-line or can not be reached a call forwarding to a Voice mail System 21 in the USA can be effected as described below. A subscriber 31 of a fixed network 32 dials the calling number of the temporary GSM subscriber (not shown in Figure 5). The call is routed to the virtual Home Location Register 17 via a Gateway MSC 33 (arrows 1 and 2). There will be detected that there is no Visitor Location Register Address (VLR-Address), because the subscriber is obviously not within reach. The Virtual Home Location Register 17 contains the instruction for a conditional call forwarding to the Voice Mail System 21. The steps 3, 4 and 5 are now executed in the same way than the steps 4,5 and 6 described in connection with Figure 3. The subscriber 31 may leave or play back a message using the Voice Mail System.
Figure 6 shows the system according to Figure 1 with a administration unit 34, which is connected via telephone and facsimile lines 35 - 39 with the mobile communication network 12 in the USA, the bridgehead 11, and the subscriber administration 40 of the GSM mobile communication network.
If there is a order for arranging a call forwarding the administration unit 34 informs and controls the concerned networks and network elements. There is established a call forwarding to the bridgehead 11 in the mobile communication network 12 and the subscriber administration 40 enables the calling number for the temporary GSM subscriber. The bridgehead 11 assigns this calling number to the calling number which is reached in the US mobile communication network 12 by call forwarding. The connections are canceled at termination of the temporary GSM subscriber contract.
The second main embodiment according to claim 11 is described with reference to Fig. 7 and 8.
The mobile communication networks PLMN X and PLMN Z, referred to as 41, 41' respectively, are networks not in accordance with GSM standards, while mobile communication network PLMN Y, referred to as 51, is of GSM type. Between these networks there is provided a bridgehead 60.
Fig. 8 shows the interaction between two selected networks, wherein network PLMN X 1 is a network of AMPS type. Both networks PLMN X and PLMN Y are connected via signaling channels.
The HLR 42 of a subscriber 5 of network PLMN X is located in network PLMN X. The bridgehead has the following tasks: He retrieves the necessary data of said subscriber of network 11 from the HLR 42, in particular his Mobile Identification Number.(MIN) and his Mobile Serial Number (MSN).
Accordingly, in the network PLMN X the bridgehead acts as a VLR 61.
The AMPS subscriber information is then converted to GSM
subscriber information, in particular MIN and MSN are converted to International Mobile Subscriber Identity (IMSI) and to Mobile Station International ISDN Number. This conversion is assisted by a local conversion data base.
The produced GSM subscriber information is now present in the bridgehead who is now acting as HLR 62 for network PLMN
Y 51. If the subscriber 45 is located in the range of network PLMN Y he may be inserted in a VLR 53 as if he were a subscriber of network PLMN Y. His virtual subscriber information are called from the bridgehead acting as HLR 62.
The process is reversed for a subscriber 55 of network PLMN
Y 51 located in the range of network PLMN X 41. His information is called form HLR 52 of network PLMN Y and transferred to the bridgehead (VLR 65). The GSM subscriber information is converted to AMPS subscriber information, assisted by a local conversion data base. Afterwards, the subscriber information is transferred to network PLMN X 41 (HLR 64). Subscriber 15 may be inserted in a VLR 53 of network PLMN X; his subscriber information may be called from said bridgehead (HLR 64).
Additionally, said bridgehead 60 may not only attend to signalisation between the incompatible networks 41, 51, but also to traffic channels. Accordingly, there are provided connections between operating points GMSC 44 of network PLMN
X and GMSC 54 of network PLMN Y via a protocol converter 76 of said bridgehead. Conversion 68 occurs between different transmitting systems, in particular a conversion from European ITU-T protocols (PCM 30) to US ANSI protocols (PCM24) and vice versa.
Claims (17)
1. A system for call forwarding from a first communication network to a second remote communication network, whereby the second communication network is one of several GSM (Global System for Mobile Communications)-type mobile-communication networks, the system comprising:
a bridgehead located in the area of said first communication network, the bridgehead serving as an internetwork junction between said first communication network and said second communication network to provide a transition network;
wherein calling numbers of the first communication network are assigned to the bridgehead to which calling numbers of the first communication network are assignable by call forwarding, the calling numbers being converted to GSM-type calling numbers in the bridgehead;
wherein the bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels and provides the basic services of subscribers of a GSM-type mobile-communication network; and wherein, by providing a call forwarding in the first communication network, a GSM calling number is assigned to the calling number of the bridgehead, which can be reached by the call forwarding, and the assigned GSM calling number is routed to and saved in a subscriber register (Home Location Register, HLR) of the transition network.
a bridgehead located in the area of said first communication network, the bridgehead serving as an internetwork junction between said first communication network and said second communication network to provide a transition network;
wherein calling numbers of the first communication network are assigned to the bridgehead to which calling numbers of the first communication network are assignable by call forwarding, the calling numbers being converted to GSM-type calling numbers in the bridgehead;
wherein the bridgehead is connected to a Mobile Services Switching Center (MSC) of the transition network via signalling and intelligence signal channels and provides the basic services of subscribers of a GSM-type mobile-communication network; and wherein, by providing a call forwarding in the first communication network, a GSM calling number is assigned to the calling number of the bridgehead, which can be reached by the call forwarding, and the assigned GSM calling number is routed to and saved in a subscriber register (Home Location Register, HLR) of the transition network.
2. The system according to claim 1, wherein the bridgehead is operable to handle a MAP (Mobile Application Part) protocol under the GSM-standard.
3. The system according to claim 1 or 2, wherein the bridgehead in the transition network operates like a Gateway Mobile Services Switching Center, (GMSC).
4. The system according to claim 1, 2 or 3, wherein the first communication network is a mobile-communication network.
5. The system according to any one of claims 1 to 4, wherein the bridgehead in the area of the first communication network comprises means for storing and restoring voice signals (Voice Mail System).
6. The system according to claim 5, wherein voice signals from the first and the second communication network are storable in the Voice Mail System.
7. The system according to claim 5 or 6, wherein voice signals stored in the Voice Mail System can be recalled through the first and the second communication network.
8. The system according to any one of claims 1 to 7, wherein the bridgehead in the area of the first communication system comprises a speech memory for storing announcements.
9. The system according to claim 8, wherein the stored announcements are recallable during calls from the first communication network depending on signals from the second communication network.
10. A system for virtual extension of a mobile-communication network by at least a second, remote mobile-communication network, wherein one of communication network is of the GSM (Global System of Mobile Communications) type, the system comprising:
a bridgehead between said first and second mobile-communication network, said bridgehead serving as a internetwork junction to one of said mobile-communication networks of the GSM type to provide a transition network, said bridgehead being connected to a Mobile Services Switching Center (MSC) of said transition network via signalling and intelligence signal channels, said bridgehead acting as a Visitor Location Register for another mobile-communication network, and as a Home Location Register for said transition network if a subscriber of said other mobile-communication network is in the range of said mobile-communication networks of the GSM
type, and said bridgehead acting as a Home Location Register for said other mobile-communication network, and as a Visitor Location Register for said transition network if a subscriber of said mobile-communication networks of the GSM type is in the range of said other mobile-communication network.
a bridgehead between said first and second mobile-communication network, said bridgehead serving as a internetwork junction to one of said mobile-communication networks of the GSM type to provide a transition network, said bridgehead being connected to a Mobile Services Switching Center (MSC) of said transition network via signalling and intelligence signal channels, said bridgehead acting as a Visitor Location Register for another mobile-communication network, and as a Home Location Register for said transition network if a subscriber of said other mobile-communication network is in the range of said mobile-communication networks of the GSM
type, and said bridgehead acting as a Home Location Register for said other mobile-communication network, and as a Visitor Location Register for said transition network if a subscriber of said mobile-communication networks of the GSM type is in the range of said other mobile-communication network.
11. The system according to claim 10, wherein the bridgehead is capable of conducting a Mobile Management Protocol, according to the GSM-standard.
12. The system according to claim 11, wherein the bridgehead is capable of conducting a Mobile Application Part of the Mobile Management Protocol according to the GSM-standard.
13. The system according to claim 10, 11 or 12, wherein the bridgehead is provided with means for storing and restoring voice signals (Voice Mail System).
14. The system according to claim 13, wherein voice signals from said transition network and said another mobile-communication network are storable in the Voice Mail System.
15. The system according to claim 13 or 14, wherein said voice signals stored in said Voice Mail System can be recalled through said transition network and said at least another mobile-communication network.
16. The system according to any one of claims 10 to 15, wherein the bridgehead comprises a speech memory for storing announcements.
17. The system according to claim 16, wherein the stored announcements are recallable during calls from the said transition network, depending on signals from said at least another mobile-communication network and vice versa.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4427072.0 | 1994-08-01 | ||
| DE4427072A DE4427072C1 (en) | 1994-08-01 | 1994-08-01 | Call forwarding appts. for relaying call from first communication network to second remote group telephone system (GSM) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2155060A1 CA2155060A1 (en) | 1996-02-02 |
| CA2155060C true CA2155060C (en) | 2004-07-06 |
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| CA002155060A Expired - Lifetime CA2155060C (en) | 1994-08-01 | 1995-07-31 | System for call forwarding from a first communication network to a second remote communication network and a system for virtual extension of a mobile communication network by at least a second, remote mobile communication network |
Country Status (6)
| Country | Link |
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| US (1) | US5734700A (en) |
| JP (1) | JP3783144B2 (en) |
| KR (1) | KR100394698B1 (en) |
| BR (1) | BR9503509A (en) |
| CA (1) | CA2155060C (en) |
| DE (2) | DE4427072C1 (en) |
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| DE4427072C1 (en) * | 1994-08-01 | 1996-02-22 | Deutsche Telekom Mobil | Call forwarding appts. for relaying call from first communication network to second remote group telephone system (GSM) |
| WO1996020574A1 (en) * | 1994-12-23 | 1996-07-04 | Nokia Telecommunications Oy | A method of routing an international call to a foreign mobile subscriber |
| JP3582169B2 (en) * | 1995-08-15 | 2004-10-27 | Ｋｄｄｉ株式会社 | Relay device between heterogeneous mobile communication networks |
| US5752162A (en) * | 1995-11-03 | 1998-05-12 | Motorola, Inc. | Methods for assigning subscriber units to visited gateways |
| US5978678A (en) * | 1996-06-07 | 1999-11-02 | Telefonaktiebolaget L M Ericsson (Publ) | Cellular telephone network routing method and apparatus for internationally roaming mobile stations |
| US6925299B1 (en) * | 1998-05-05 | 2005-08-02 | Starhome Gmbh | System and method for providing access to value added services for roaming users of mobile telephones |
| DE19821049C2 (en) * | 1998-05-11 | 2001-08-16 | Deutsche Telekom Ag | Call forwarding |
| DE19821567C2 (en) * | 1998-05-14 | 2002-08-22 | Deutsche Telekom Ag | Call forwarding |
| US6259914B1 (en) * | 1998-08-07 | 2001-07-10 | Bellsouth Intellectual Property Corporation | Method and apparatus for implementing international wireless roaming |
| US6356756B1 (en) | 1998-08-26 | 2002-03-12 | Bellsouth Corporation | Method and system for routing calls to a wireless telecommunications services platform |
| US6560216B1 (en) * | 1998-09-17 | 2003-05-06 | Openwave Systems Inc. | Data network computing device call processing |
| US6615041B2 (en) * | 1998-11-05 | 2003-09-02 | Bellsouth Intellectual Property Corporation | Methods and systems for providing information to a home system regarding a wireless unit roaming in a visited system |
| US6211462B1 (en) | 1998-11-05 | 2001-04-03 | Texas Instruments Incorporated | Low inductance power package for integrated circuits |
| US6314284B1 (en) * | 1998-12-30 | 2001-11-06 | Ericsson Inc. | System and method for providing service transparency for mobile terminating calls within an H.323 system |
| AU3848700A (en) * | 1999-03-17 | 2000-10-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for transmitting message waiting notification between gsm and tdma networks |
| US7245912B1 (en) * | 1999-03-31 | 2007-07-17 | British Telecommunications Public Limited Company | Mobility management |
| US6996396B1 (en) * | 1999-12-30 | 2006-02-07 | Cingular Wireless Ii, Llc | Method of and apparatus for use in forwarding calls intended for roaming subscriber units |
| DE10006819A1 (en) * | 2000-02-09 | 2001-08-16 | Deutsche Telekom Ag | Method for roaming in mobile radio network using additional Remote Home Location Register which is integrated into calling subscriber network |
| EP1457061B1 (en) * | 2001-12-21 | 2012-04-25 | France Telecom | Call processing in mobile telecommunications networks |
| US6658259B2 (en) * | 2002-03-07 | 2003-12-02 | Interwave Communications International, Ltd. | Wireless network having a virtual HLR and method of operating the same |
| GB0300779D0 (en) * | 2003-01-14 | 2003-02-12 | Intellprop Ltd | Telecommunications services apparatus |
| US20050250493A1 (en) * | 2003-11-14 | 2005-11-10 | Shany Elkarat | Terminated call control for roaming cellular telephony |
| JP2008507217A (en) * | 2004-07-16 | 2008-03-06 | ブリッジポート ネットワークス， インコーポレイテッド | Presence detection and handoff for cellular and Internet protocol telephony |
| US20070087753A1 (en) * | 2005-10-13 | 2007-04-19 | Jay Rosenblatt | Method for providing international calling services |
| WO2007074466A2 (en) * | 2005-12-28 | 2007-07-05 | Starhome Gmbh | Late forwarding to local voicemail system of calls to roaming users |
| US7720474B2 (en) * | 2006-04-18 | 2010-05-18 | Alcatel-Lucent Usa Inc. | Method and apparatus for call delivery |
| WO2010147837A2 (en) | 2009-06-17 | 2010-12-23 | Bridgeport Networks, Inc. | Enhanced presence detection for routing decisions |
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| GB2234649B (en) * | 1989-04-27 | 1993-10-27 | Stc Plc | Personal communications systems |
| GB9013605D0 (en) * | 1990-06-18 | 1990-08-08 | Stc Plc | Mobile communications |
| US5177780A (en) * | 1990-10-18 | 1993-01-05 | At&T Bell Laboratories | Method of voice mail notification for cellular telephone systems |
| GB2254521A (en) * | 1991-04-03 | 1992-10-07 | * Gec Plessey Telecommunications Limited | Pstn/pcn switching arrangement |
| DE4140974A1 (en) * | 1991-12-12 | 1993-06-17 | Sel Alcatel Ag | COMMUNICATION SYSTEM |
| DE4417779C1 (en) * | 1994-05-20 | 1995-12-07 | Siemens Ag | Mobile radio system |
| DE4427072C1 (en) * | 1994-08-01 | 1996-02-22 | Deutsche Telekom Mobil | Call forwarding appts. for relaying call from first communication network to second remote group telephone system (GSM) |
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1994
- 1994-08-01 DE DE4427072A patent/DE4427072C1/en not_active Expired - Lifetime
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- 1995-07-28 KR KR1019950022616A patent/KR100394698B1/en not_active IP Right Cessation
- 1995-07-28 DE DE19527468A patent/DE19527468C2/en not_active Expired - Lifetime
- 1995-07-31 CA CA002155060A patent/CA2155060C/en not_active Expired - Lifetime
- 1995-07-31 US US08/509,084 patent/US5734700A/en not_active Expired - Lifetime
- 1995-07-31 BR BR9503509A patent/BR9503509A/en not_active IP Right Cessation
- 1995-08-01 JP JP19652395A patent/JP3783144B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3783144B2 (en) | 2006-06-07 |
| BR9503509A (en) | 1996-05-28 |
| CA2155060A1 (en) | 1996-02-02 |
| KR960009778A (en) | 1996-03-22 |
| DE19527468A1 (en) | 1997-01-30 |
| DE4427072C1 (en) | 1996-02-22 |
| KR100394698B1 (en) | 2003-12-01 |
| JPH08205225A (en) | 1996-08-09 |
| US5734700A (en) | 1998-03-31 |
| DE19527468C2 (en) | 2003-01-02 |
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