Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-02-15
1998-10-27
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455432, 455433, 455445, 455422, H04Q 724
Patent
active
058289593
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/FI 94/00437 filed Sep. 28, 1994.
FIELD OF THE INVENTION
The invention relates to a telecommunications network comprising exchanges, subscriber stations, at least part of them capable of moving in the network, as well as at least one subscriber data base for maintaining location information of subscribers.
BACKGROUND OF THE INVENTION
At present, various kinds of developed cellular radio networks are in use and under development, in which a geographical area covered by a network is divided into smaller separate radio coverage areas, i.e. cells, in such a way that, when being in a cell, a radio station communicates with a fixed network via a fixed radio station located in the cell. Radio stations belonging to a system may move freely within the area of the system from one cell into another. One such system is a digital mobile telephone system GSM. When a subscriber, being in the same system or in an external system, wishes to call to a Mobile Station (MS) of such a system, the cellular radio network must know the actual location of the MS in order to be able to route the call. A number dialled by a calling subscriber does not contain any information as to the actual location of the called MS. In other words, numbering in developed mobile telephone networks (e.g. in a GSM system) does not depend on a physical access point. In the present mobile telephone networks, there are no fixed access points, but only traffic channels in public use, which channels are used by mobile subscriber stations. A connection established is always based on the use of identity. In a fixed telephone network (PSTN), all numbers (except new Personal Numbers and UPT numbers) indicate a certain fixed physical extension and a routing takes place directly on the basis of "the address number" of the subscriber. On the other hand, for establishing a connection in a cellular radio network, it is necessary to find out the location of the MS and the routing address required for the call. The cellular network typically knows the location of the MS with an accuracy of a larger area formed by several cells, which area is generally called location area. When moving into a new location area, the MS is registered as a visiting subscriber with a subscriber register of the respective location area, i.e. with a so-called visitor location register, and a so-called roaming number is assigned for the MS. Simultaneously, the MS and the associated information are removed from the visitor location register of a respective departed location area. In general, the cellular network additionally comprises at least one centralized data base, i.e. a so-called home location register, in which the information of the subscriber is stored permanently. When a new subscriber is registered with a visitor location register, information concerning the subscriber is requested from the home location register and the location information of the subscriber is simultaneously updated in the home location register. There is generally a visitor location register in association with each of the mobile telephone exchanges, and each visitor location register may serve several location areas. The basic structure and basic functions of the GSM system are well-known by persons skilled in the art and are defined in the GSM standard issued by the European Telecommunications Standards Institute (ETSI).
In an analog NMT system, all subscribers have a home exchange, to which all mobile-terminating calls are routed. When a subscriber leaves the area of the home exchange and roams into the area of another exchange in the cellular radio network, the subscriber register in the new exchange informs the home exchange of the roaming number of the subscriber, this number indicating the current location of the subscriber. In case of mobile subscribers of high mobility, network capacity is wasted by this method: it would be most economical that the first exchange of the cellular radio network to process a call would interrogate the h
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Bost Dwayne D.
Gelin Jean A.
Nokia Telecommunications Oy
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