Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-12-02
1999-03-02
Chin, Wellington
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455426, 455462, 455465, H04Q 724
Patent
active
058783431
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for interconnecting a first communication system and a second communication system such as a cordless access system.
The invention also relates to a communication system comprising a first cellular mobile comminication system and a second cordless access system. Moreover the invention relates to a cordless access communication system which is interworked with a cellular mobile communication system. Still further the invention relates to an arrangement for interconnecting a first and a second system and an interconnected system used to provide for locating and handovers both between a first and a second system and between different sites of the second system.
So called digital cordless communication systems are e.g. used for a limited number of subscribers within a limited area such as within an office building or similar. Particularly such systems are pico-cellular and comprise a number of Base Stations which are connected to a central unit. Through handovers from one pico-cell to another pico-cell the user can roam within the area covered by the network. Such systems can be configured to meet particular requirements of the user in respect of the area to be covered and the number of terminal units, in a particular embodiment, portable telephones, how to be used etc. The systems may particularly be designed to operate in indoor environments with a high traffic density. However, merely a limited number of subscribers can co-exist within the system. An example of such a communication system is the DECT system or the Digital European Cordless Telecommunication system which is a pico-cellular digital cordless access technology standardised by ETSI (European Telecommunications Standardisation Institute). However, a terminal of DECT can not roam between different DECT covered sites and the DECT terminal will only function when the subscriber is within a limited area as defined by the network. Presently a number of attempts are done to connect e.g. the DECT access system to a cellular network and to use the mobility management functionalities of this network and to provide the interconnection with a cellular mobile communication system as e.g. the GSM system.
STATE OF THE ART
Today efforts are done to provide a roaming capability between e.g. different DECT sites through the use of a fixed network. Furthermore, works are done within the ETSI to provide a standardisation of an interworking between GSM and DECT. However, up to date there are no really interworking systems known. In the article "Cordless access to GSM" in Proc. of 5th Nordic Seminar on Digital Mobile Radio Comm. 1992 by S. Salmela et.al., access of the DECT system to the GSM network is discussed and an arrangement is suggested wherein the Fixed Part Controller of the DECT system is connected to a Mobile Switching Center (MSC) over an interface named the R(3) interface which is a modified ISDN subscriber interface using the so called DSS.1.sup.+ protocol which is an enhanced ISDN DSS.1 protocol.
Since the DECT access system is directly connected to the MSC, modifications of the interface or the protocol are necessary. This involves complications and impairs an easy interconnection of the systems as well as flexibility is reduced.
SUMMARY OF THE INVENTION
The invention aims at solving the problems of interconnecting a first communication system such as a cellular mobile communication system and a second communication system such as a cordless access communication system in an easy and flexible way.
In a so called cordless access system connections can generally merely be set up within each separate site of this system and moreover a subscriber of such a system cannot access a more global cellular mobile communication system.
Up to now to interconnect a first and a second system of the abovementioned kind at least the interface of the first cellular mobile communication system has to be modified which means that an entirely new interface has to be formed.
It is thus an object
REFERENCES:
patent: 5353331 (1994-10-01), Emery et al.
patent: 5610974 (1997-03-01), Lantto
patent: 5659598 (1997-08-01), Byrne et al.
Antero Alvesalo, "DECT System as an Extension to GSM Infrastructure", MRC Mobile Radio Conference 1991, Nice, France, Nov. 13-15, 1991, pp. 203/9 - 206.
Wide area mobility for DECT by S. Ghaheri Niri et al.-IEEE proc. pp. 1119-1125, May 1996.
Cordless access to GSM by S. Salmela et al. DMR V Proceedings pp. 93-98, Jan. 12, 1992.
Lundstrom Anders
Morin Stig
Robert Guy
Chin Wellington
Jama Isaak R.
Telefonaktiebolaget LM Ericsson
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