Importance

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Abstract

A communication system such as a digital cordless telephone system comprises primary (or base) stations (PS) and secondary stations (SS). The primary stations over a local area are coupled to a system controller (14 or 15) which interfaces with the PSTN. A TDMA method is used for forward and reverse transmissions between a primary and a secondary station. For digitized speech transmission normally one duplex voice channel formed by one forward time slot (or physical channel) and one reverse time slot (or physical channel) in each frame is allocated for the transaction. For fast data rates it is desirable that additional duplex voice channels be made available quickly for the transmission of a fast data message, after which the additional duplex voice channels can be relinquished. In order to facilitate the rapid set-up of a data transaction, a map store in each data secondary station lists the usage and quality of all the duplex voice channels. The secondary station, when ready to transmit data, immediately uses additional duplex voice channels from those listed, thus avoiding the necessity of scanning all the duplex voice channels before deciding on which additional duplex voice channels to attempt to transmit in.

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First Claim