Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Patent
1996-06-06
1998-05-12
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
455517, 455522, 455524, 455525, H04B 100, H04B 700
Patent
active
057521972
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/Fl94/00390, filed Sep. 2, 1994.
FIELD OF THE INVENTION
The invention relates to a method for adjusting transmission power in a mobile radio system covering a geographical area divided into radio cells each comprising a base station, an exchange of the system comprising a database listing base stations subject to interference as a result of the use of a specific channel, wherein a subscriber station transmits a connection establishment request; a base station receives the connection establishment request transmitted by the subscriber station; the base station measures the quality of the transmission from the subscriber station and transmits information about the quality of the transmission to the exchange.
The invention further relates to a mobile exchange comprising: a switching field for switching calls; an interface unit; a controller for controlling the switching field; a memory means including a database listing base stations subject to interference as a result of the use of a specific channel.
The invention can be applied e.g. in trunking networks, i.e. shared radio networks, which are private mobile radio networks sharing radio channels to offer several user groups similar functions and services as a private mobile radio network used by a single organization.
However, the invention is equally applicable in conventional cellular radio telephone systems, e.g. mobile radio systems such as the GSM system.
The invention is suitable for use in radio telephone systems having either an analog or a digital radio path. Analog radio telephone systems are described e.g. in MPT 1327, A Signalling Standard for Trunked Private Land Mobile Radio Systems, Radiocommunications Agency, January 1988, Revised and reprinted November 1991, and MPT 1343, Performance Specification, Radiocommunications Agency, January 1988, Revised and reprinted September 1991, both issued by the British Department of Trade and Industry.
BACKGROUND OF THE INVENTION
In radio telephone systems, it has been known that the base stations of the radio telephone system measure the quality of radio paths between the base stations and subscriber stations, such as radio telephones, hand portable phones or mobile phones, in the radio telephone system. This has been done by measuring the quality of radio messages transmitted by subscriber stations, such as signalling or connection establishment requests; the quality is represented by the power level or signal strength of the received transmission. Base stations performing such measurements may have been main base stations or additional base stations called infill base stations in the radio cells. In prior art solutions, the measuring data obtained by the base stations has been transmitted to the exchange of the radio telephone system, and the exchange has stored the data in its database. Later on, the exchange has retrieved from the database the newest measuring data item or a measuring data item in which the value describing the quality of the radio path indicates that this particular radio path is the best available radio path. The exchange has used this measuring data to select the base station having the best received signal quality for communication between the subscriber station and the mobile exchange. The exchange has then informed the subscriber station over the signalling or control channel of the system which is the base station the exchange wants the subscriber station to communicate with. It has also been known that if the base station with which the subscriber station is expected to start to communicate has been an additional or infill base station, it has been possible for the exchange to command the subscriber station and the concerned base station to use only half of the radio power on the traffic channel between them.
Furthermore, the prior art radio telephone systems, typically their exchanges, have included a database with a table containing information for each base station about base stations and channels subject
REFERENCES:
patent: 5157709 (1992-10-01), Ohteru
patent: 5241690 (1993-08-01), Larsson et al.
patent: 5345598 (1994-09-01), Dent
patent: 5386589 (1995-01-01), Kanai
patent: 5507008 (1996-04-01), Kanai et al.
patent: 5551057 (1996-08-01), Mitra
patent: 5566356 (1996-10-01), Taketsugu
Arthur Gertrude
Eisenzopf Reinhard J.
Nokia Telecommunications Oy
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