H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/17, 325/30
H04B 7/26 (2006.01) H04B 7/04 (2006.01) H04L 5/26 (2006.01) H04M 1/725 (2006.01) H04M 1/733 (2006.01)
Patent
CA 1324411
ABSTRACT OF THE DISCLOSURE A method of transmitting calls between a radio base station and one or more portable radio telephones 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 and transmit/receive call information with the aid of time divi- sion multiple access (TDMA). The transmission from a base sta- tion to a radio telephone occupies time slots within one half of a frame interval and the reception occupies time slots within the other half. When a channel occupies a time slot for transmis- sion/reception over a given carrier frequency the remaining car- rier frequencies are blocked for precisely this time slot, and a second time slot with the same or a second carrier frequency shall be used for a second channel. A radio unit for carrying out the method is described.
614954
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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