Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-07-09
2003-04-29
Bost, Dwayne (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S422100, C455S403000
Reexamination Certificate
active
06556831
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a telecommunication system for providing a call connection between a first subscriber station and a second subscriber station and a method for setting-up a call connection in a telecommunication system between a first subscriber station and a second subscriber station, wherein said first subscriber station is a mobile subscriber station, which is connected to a first mobile radio telecommunication network and said second subscriber station is connected to a telecommunication network connected to said first mobile radio telecommunication network, and switching means of a mobile telecommunication system for providing a call connection between a first subscriber station and a second subscriber station wherein said first subscriber station is a mobile subscriber station which is connected to a first mobile radio telecommunication network and said second subscriber station is connected to a telecommunication network which is connected to said first mobile radio telecommunication network.
BACKGROUND OF THE INVENTION
FIG. 5
shows components of a typical digital cellular telecommunication system according to the standards of the global system for mobile communications GSM. Such a telecommunication system is usually divided into a switching sub-system NSS and a base station sub-system BSS. The switching sub-system NSS comprises a gateway mobile switching center GMSC, a home location register HLR and a plurality of visitor location registers VLRs and mobile switching centers MSCs. For the sake of clarity, only two mobile switching centers MSCs and one visitor location register VLR are depicted. The base station sub-system BSS is constituted by facilities such as radio transceivers and switching centers to link those radio transceivers. The network shown in
FIG. 5
is simplified and details on the base station sub-system BSS are omitted for the sake of clarity. To link such a telecommunication system to another telecommunication system there is provided the gateway mobile switching center GMSC that serves to determine the MSC/VLR currently serving a mobile subscriber station MS in the telecommunication system and to route calls towards this mobile subscriber station MS.
To this end, the gateway mobile switching center GMSC is connected to the home location register HLR wherein subscriber information and mobile information to allow incoming calls to be routed to the mobile subscriber station MS are stored. Any administrative action by the network operator with respect to subscriber data is carried out in the home location register HLR.
As can be seen from
FIG. 5
, the GSM-network comprises a plurality of mobile switching centers MSC each covering a predetermined number of basic cells covering a service area in which a mobile subscriber station MS can move. To this end, each mobile switching center MSC is connected to a visitor location register VLR. When a roaming mobile subscriber station MS enters a service area assigned to a specific mobile switching center MSC, the mobile switching center MSC informs the associated visitor location register VLR about the presence of the mobile subscriber station MS.
To route a call to a mobile subscriber station MS, the gateway mobile switching center GMSC is also connected to the mobile switching center MSC through which the mobile subscriber station MS can obtain a service. The mobile switching center MSC performs the necessary switching functions required for mobile subscriber stations MS covered by this mobile switching center MSC. In particular, the mobile switching center MSC monitors the mobility of its mobile subscriber stations MS and manages necessary resources required to handle and update the location registration updating procedures. Location information concerning the respective mobile subscriber stations MS is available in said mobile switching center MSC and is stored in said visitor location register VLR. The home location register always contains the address of the visitor location register VLR or the mobile switching center assigned to the cell in which the respective mobile subscriber station MS is currently located. If said mobile subscriber station MS is located in another GSM network which is not its home-GSM network, the home location register HLR in the home-GSM network of the mobile subscriber station MS contains an address of said other GSM-network pointing to an HLR of the other network.
The base station sub-system BSS corresponds to a physical equipment providing radio coverage to prescribed geographical areas referred to as cells and shown as hexagonal geographical regions in FIG.
5
. Each base station sub-system BSS contains equipment required to communicate with the mobile subscriber stations MS such as a plurality of switching centers (not shown). Functionally, the base station sub-system BSS provides a control function carried out by a base station controller BSC and a transmitting function performed by the base transceiver system BTS (both not shown) The base transceiver system BTS corresponds to a radio transmission equipment that covers each cell. A base station sub-system can serve several cells because it can have multiple base transceiver systems BTS.
DESCRIPTION OF THE PRIOR ART
In a conventional GSM network as shown in FIG.
5
and operating as described above, there is available network information indicating a current location of a mobile subscriber station MS. However, said network information is kept inside the GSM network.
WO 96/25830 discloses a conventional telecommunication system. For determining a position of a mobile subscriber station in a mobile radio telecommunication network in said telecommunication system, the telecommunication system establishes a call connection generated by a position handler. Such a call connection for the determination of the position of a mobile subscriber station is referred to as a simulated call connection. In the simulated call connection, a call connection is established between the position handler and the mobile subscriber station in question. Therefore, a radio path has to be established between the mobile subscriber station in question and the nearest or best suitable Base Transceiver Station serving the area in which the mobile subscriber station in question is momentarily located. The position handler contains mobile subscriber station categories and subscriber stations intended for simulated call connections. The simulated call connection is released when the system has sent a paging message to said mobile station and after said mobile subscriber station has sent a response to this paging message. This response is used to determine the cell in which the mobile subscsriber station is located. A so-called timing advance of a mobile subscriber station can be used to obtain more accurate positioning of said mobile subscriber station in the cell.
U.S. Pat. No. 5,625,668 discloses another conventional telecommunication system providing a polling system to determine the location of a mobile subscriber station. A calling subscriber who requests location information on a mobile subscriber station firstly accesses a database processing facility. This database processing facility accesses the mobile subscriber station through the nearest cellular station. A radio path has to be established between the nearest cellular station and the mobile subscriber station. Then, a current location of the mobile subscriber station is determined by means of a global positioning system GPS arranged in said mobile subscriber station. The location information thereby obtained in transmitted via said radio path to the nearest cellular station and further to said database processing facility which forwards said location information to the requesting subscriber station.
In both conventional telecommunication systems respectively disclosed in WO 96/25830 and U.S. Pat. No. 5,625,668 it is necessary to access the mobile subscriber station in the mobile radio telecommunication network. Accordingly, each time a requesting subscriber st
Bost Dwayne
Telefonaktiebolaget LM Ericsson (publ)
Trinh Sonny
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