Radio communication system
AssigneeNEC Corporation
InventorsAtsushi Kashitani, Katsuhiro Yamanaka
Life of this patent
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Abstract
A radio communication system includes a plurality of base stations and a plurality of mobile stations belonging to the service areas covered by the radio zones respectively formed by the base stations and performs data communication by polling. Each base station includes a transmission output control section for controlling the transmission output of a polling signal to sequentially form a plurality of radio zones having different coverages, a section for receiving responses from the plurality of mobile stations to a plurality of polling signals having different transmission outputs and determining the position of each of the mobile stations in a specific one of the plurality of radio zones.
Claims8
A radio communication system which comprises a plurality of base stations and a plurality of mobile stations belonging to service areas covered by radio zones respectively formed by said base stations and performs data communication by polling,
- each of said plurality of base stations comprising transmission output control means for controlling a transmission output of a polling signal to alternately transmit a long-distance polling signal having a strong transmission output and a short-distance polling signal having a weak transmission output, thereby alternately forming large and small radio zones, and means for receiving responses from said plurality of mobile stations to the long- and short-distance polling signals and determining a specific one of the large and small zones in which each of said mobile stations is located.
A radio communication system which comprises a plurality of base stations and a plurality of mobile stations belonging to service areas covered by radio zones respectively formed by said base stations and performs data communication by polling,
- each of said plurality of base stations comprising transmission output control means for controlling a transmission output of a polling signal to alternately transmit a long-distance polling signal having a strong transmission output and a short-distance polling signal having a weak transmission output, thereby alternately forming large and small radio zones, and means for receiving responses from said plurality of mobile stations to the long- and short-distance polling signals and determining a specific one of the large and small zones in which each of said mobile stations is located,
- wherein each of the polling signals has an ID for identifying a base station which has originated the polling signal and a transmission output value indicating whether the polling signal is the long-distance polling signal or the short-distance polling signal, and
- each of said plurality of mobile stations determines, from an ID number of said base station and the transmission output obtained by receiving the polling signal, a specific one of the large and small radio zones in which said mobile station is located and a specific one of said plurality of base stations which forms the radio zone in which said mobile station is located.
Dependencies are inferred from the claim text.