Radio communication system
First Claim
1. A radio communication system, comprising:
- a non-mobile base station for performing communication by a radio wave, wherein said base station includes;
comparison means for comparing a time slot in a reference data string for regulating the time slot with a position of data corresponding to said time slot in the data string transmitted actually by a plurality of non-mobile sub-stations to thereby extract a timing error of said data with respect to said time slot; and
timing error transmission means for transmitting said timing error to said plurality of sub-stations, andwherein each of said plurality of sub-stations includes transmission timing correction means for correcting a timing for transmitting said data to said base station on the basis of said timing error transmitted by said base station so as to reduce said timing error; and
are located within a specific distance from said base station each for transmitting by radio waves to said base station data of several bits to be collected instantaneously by said base station,wherein the data each are assigned at a predetermined time slot in said data string of the time division multiple access system.
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Accused Products
Abstract
A base station transmits a synchronizing signal and a clock and AGC circuits of numerous sub-stations produce AGC voltages for indicating adjustment of gain and adjust levels of received signals converted to an intermediate frequency supplied from a frequency conversion unit on the basis of the AGC voltage so that the levels of the received signals are maintained constant in order that the base station can collect a small amount of data from each of the sub-stations in an extremely short time. A data processing circuit of each sub-station transmits data to the base station at a transmission timing corresponding to an identification number of its own sub-station on the basis of the synchronizing signal and the clock in the received data and a gain control circuit adjusts transmission power on the basis of the AGC voltage.
90 Citations
6 Claims
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1. A radio communication system, comprising:
a non-mobile base station for performing communication by a radio wave, wherein said base station includes; comparison means for comparing a time slot in a reference data string for regulating the time slot with a position of data corresponding to said time slot in the data string transmitted actually by a plurality of non-mobile sub-stations to thereby extract a timing error of said data with respect to said time slot; and timing error transmission means for transmitting said timing error to said plurality of sub-stations, and wherein each of said plurality of sub-stations includes transmission timing correction means for correcting a timing for transmitting said data to said base station on the basis of said timing error transmitted by said base station so as to reduce said timing error; and are located within a specific distance from said base station each for transmitting by radio waves to said base station data of several bits to be collected instantaneously by said base station, wherein the data each are assigned at a predetermined time slot in said data string of the time division multiple access system. - View Dependent Claims (2, 3)
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4. A radio communication system comprising:
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a non-mobile base station for performing communication by a radio wave; and a plurality of non-mobile sub-stations are located within a specific distance from said base station each for transmitting by radio waves to said base station data of several bits to be collected instantaneously by said base station, wherein a first frequency used by said base station and a second frequency used by said sub-stations have the interrelation in terms of fading; and each of said plurality of sub-stations includes; received power monitoring means for monitoring received power of radio waves of said first frequency from said base station; fading situation judgement means for judging a situation of fading on the basis of the received power monitored; and transmission power correction means for correcting transmission power of radio waves of said second frequency to said base station on the basis of said judged fading situation in order to prevent one data transmitted by the sub-station itself from interfering with another data transmitted by another sub-station, wherein the data each are assigned at a predetermined time slot in a data string of the time division multiple access system. - View Dependent Claims (5, 6)
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Specification