| 摘要 |
A mobile communication system controls switching a transmission diversity system for each channel, and improves the quality of the channel. When the channel type in an uplink is a channel for transmitting voice, open loop transmission diversity is used (steps S 1 ->S 3 ). When the channel type in an uplink is a channel for transmitting a packet, closed loop transmission diversity is used (steps S 1 ->S 2 ). Since the open loop transmission diversity or the closed loop transmission diversity whichever is more appropriate can be used, a transmission diversity system can be appropriately switched for each channel, thereby improving the quality of the channel.
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