| 摘要 |
The present invention relates to a data transmission method, data transmission system and a cellular radio system employing information channels having at least two different capacities, the speech transmitted on said channels being coded in such a manner that on a channel having a higher capacity, essentially fewer symbols to be transmitted are coded from the same speech signal block than on a channel having a lower capacity. In order to extend the coverage area of the cellular radio system of the invention, the coverage area of the base station (BTS) comprises an inner coverage zone (50), on which frequency hopping is not applied, and an outer coverage zone (51), which employs an information channel having a lower capacity, the signal transmitted on said channel being speech coded according to a channel of a higher capacity, and that channel coding is performed on the speech coded data in such a manner that the number of symbols corresponds to the channel of a lower capacity, and frequency hopping being applied on said channel.
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