Radio communications system, base station, mobile station,...

Details Radio communications system, base station, mobile station,... Radio communications system, base station, mobile station,...

2007-09-11

2007-09-11

Anderson, Matthew (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

With control signal

C455S404200, C455S516000, C455S063400, C370S342000

Reexamination Certificate

active

10252695

ABSTRACT:
A radio communications system which can improve the frequency utilization efficiency by combined use of the PDMA system and the CSMA system. Concurrently with the transmission of a second radio wave by the base station in the arrival direction of a first radio wave, carrier sense is performed by mobile stations in regard to the second radio wave. By designing the system so that the first radio wave is transmitted only when the second radio wave is not received, simultaneous transmissions are prevented among those mobile stations which have such small directional differences from the base station that signals cannot be separated, while those mobile stations with large directional differences from the base station are carried out space-division multiplexing. In this way, the frequency utilization efficiency can be improved.

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