Method of transmitting call information in a short range mobile

Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission

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379 63, 370 953, H04B 100, H04J 316

Patent

active

051347105

ABSTRACT:
A method of transmitting calls between a radio base station (FS) and one or more portable radio telephones (PS) which are at a short distance from the base station. The base stations of the mobile radio system all have access to all carrier frequencies (f.sub.1 -f.sub.4) and transmit/receive call information with the aid of time division multiple access (TDMA). The transmission from a base station (FS) to a radio telephone (PS) occupies time slots (CH1-CH16) within one half of a frame interval and the reception occupies time slots within the other half. When a channel occupies a time slot (CH1) for transmission/reception over a given carrier frequency (f.sub.1) the remaining carrier frequencies are blocked for precisely this time slot, and a second time slot with the same (f.sub.1) or a second carrier frequency (f.sub.1 -f.sub.4) shall be used for a second channel. A radio unit for carrying out the method is described.

REFERENCES:
patent: 4747101 (1988-05-01), Akaiwa et al.
patent: 4748681 (1988-05-01), Schmidt
patent: 4754453 (1988-06-01), Eizenhoffer
patent: 4914651 (1990-04-01), Lusignan

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