Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Patent
1995-05-02
1997-09-09
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
455 671, 455515, 455525, 455434, H04Q 700, H04Q 900
Patent
active
056666560
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method for selecting a channel in a mobile radio system, the geographical coverage area of which is divided into radio cells, each radio cell comprising a main base station indicated by an identifier and at least one radio cell comprising at least one infill base station, in which method the main base station signals with subscriber stations on a control channel having a downlink frequency for signalling from a base station to a subscriber station and an uplink frequency for signalling from a subscriber station to a base station, and an infill base station monitors the subscriber stations at the uplink frequency of the control channel of the main base station.
The invention may be applied for instance to trunking networks, i.e. divided radio networks, being private radio networks, which offer by means of common use of radio channels several user groups the functions and services of a private radio network used by one organization.
However, the invention may be applied equally well also to conventional cellular mobile radio systems, e.g. mobile telephone systems.
The invention is suitable for being used in mobile radio systems having a digital radio path as well as in those having an analog radio path. Analog mobile radio systems have been described for instance in the following publications of the British Department of Trade and Industry: "MPT 1327, January 1988, Revised and reprinted November 1991, A Signalling Standard for Trunked Private Land Mobile Radio Systems, Radiocommunications Agency" and "MPT 1343, January 1988, Revised and reprinted September 1991, Performance Specification, Radiocommunications Agency".
BACKGROUND OF THE INVENTION
It is known in connection with mobile radio systems that, besides a main base station, also one or several additional base stations, i.e. infill base stations, may be positioned in one radio cell. An infill base station may be separate or it may be based on using an antenna and/or transceiver units of the main base station. It is reasonable to use infill base stations when frequency allocation plans and schemes and shortage of frequency range make it necessary to reuse the same traffic channel in the cells of a mobile radio system, such as a cellular radio system, at shorter distance than would be done according to normal frequency allocation plans. The infill base stations have smaller coverage areas, because the traffic between them and subscriber stations use in both directions lower radio powers than the normal main or mother base stations do.
Those traffic channel units of one infill base station or the main base station which are allocated to be used by infill base stations can use a group of infill base station channels. The channels of an infill base station are conventionally configurated in such a way that the infill base stations use the control channel of the main base station. The infill base stations thus monitor signalling of subscriber stations occurring on the control channel of the main base station. Then the subscriber stations, i.e. radio telephones, desiring a connection with the network, contact on the control channel of the main base station an infill base station, which transmits a request for establishing a connection to an exchange of the mobile radio system. The exchange then allocates some suitable traffic channel of the additional, i.e. infill base station for the traffic between the subscriber station and the infill base station, and a command to move onto this traffic channel is transmitted to the infill base station, which starts monitoring that traffic channel.
A problem with allocating a traffic channel according to the prior art is that, when the exchange of the mobile radio system tells an infill base station to start monitoring the traffic occurring on a predetermined control channel, the infill base station actually starts monitoring this control channel and searches for signalling of subscriber stations on that channel. An attentive reader notices that, in a case according to
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patent: 5327574 (1994-07-01), Monma et al.
patent: 5437056 (1995-07-01), Rautiola
patent: 5493286 (1996-02-01), Grube et al.
patent: 5535423 (1996-07-01), Dupuy
patent: 5548807 (1996-08-01), Ueda
Bhattacharya Sam
Eisenzopf Reinhard J.
Nokia Telecommunications Oy
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