Telecommunications – Transmitter – Diversity
Reexamination Certificate
2006-07-27
2009-11-03
Nguyen, Duc M (Department: 2618)
Telecommunications
Transmitter
Diversity
C455S103000, C455S069000, C455S506000, C375S267000, C375S299000
Reexamination Certificate
active
07613432
ABSTRACT:
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 S1→S3). When the channel type in an uplink is a channel for transmitting a packet, closed loop transmission diversity is used (steps S1→S2). Since the open loop transmission diversity or the closed loop transmission diversity which ever 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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Ando Hidehiro
Ishii Hiroyuki
Sato Takuya
Crowell & Moring LLP
Nguyen Duc M
NTT DoCoMo Inc.
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