Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-04-16
2000-11-28
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455422, 455552, H04Q 720
Patent
active
06154647&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an arrangement and to a method for increasing the range of at least two telecommunication networks, so called service networks having mutually different specified standards.
DESCRIPTION OF THE BACKGROUND ART
The increasing need for mobility in telecommunications systems requires the telephone network to cover larger geographical areas. A natural solution to increasing the geographical range of a telephone network is to expand the network. The expansion is optimized to suit the specified network standards. European Patent Application 0 602 857 discloses another solution for extending the range of a telephone network. The application illustrates how the services in a fixed telephone network can be reached transparently from a mobile unit located in a mobile telephone network. According to this publication, all outgoing calls from the mobile are first routed or directed to a program unit in the fixed telephone network. The call is then treated as though it had been setup from the program unit and access is given to the services of the fixed network. Another solution is disclosed in International Patent Application WO 94/13112, which illustrates a method of affording radio based access to a ground based telecommunications system. The aforesaid applications teach solutions for extending a telephone network having a specified signal standard, so as to cover a wider geographical area. If the solutions illustrated in these publications were to be applied to extend the coverage area of several networks that have mutually different specified standards, the total cost for each network proprietor would be far-reaching. U.S. Pat. No. 5,303,286 discloses a telecommunications system which includes PCN-system (Personal Communications Network) which has been integrated with a cellular network. The PCN-system is a part of the cellular network and when the PCN-system is heavily loaded certain frequencies in the cellular network can be allocated users in the PCN-system. The telecommunications system also includes a ground-based network part which is able to transfer signals from the PCN-user to the PCNsystem via the cellular network, such that the user of the PCN-system is perceived as being present in the PCN-network despite the cellular network being used in the radio access. The two systems can be reached from the cellular network. A common radio unit is used for access to both systems. The solution proposed in the US Patent Specification is complicated and fails to provide system flexibility and also requires a standard radio interface that has been specially adapted for the two systems that are included. The addition of further service networks having different types of specified signal standards would require further adaptations in addition to those already made and make the solution still more complicated.
SUMMARY OF THE INVENTION
The problem with extending the geographical coverage areas of several telecommunications networks that have mutually different specified standards reside in the costs that are entailed for the network proprietors in extending each individual network. Endeavours towards optimizing telecommunications networks, so-called service networks, has long constituted a mental obstacle to using a common telecommunications network for several telecommunications networks that have mutually different specified standards. A specified network standard is defined as the signalling protocol used by the network in communicating within said network, i.e. the "language" signalling nodes within the network are used to communicate with one another. Another problem encountered when extending the geographical coverage area of a network is the requirement of a common interface to subscribers in the common network. A common network subscriber may belong to both a ground-based service network and a radio-based service network. This problem is solved in accordance with the invention by connecting the service networks to a common radio-based universal network. The uni
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Chambert Georg William Robin
Dahlin Jan Erik .ANG.ke Steinar
Appiah Charles N.
Eisenzopf Reinhard J.
Telefonaktiebolaget LM Ericsson
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