Telecommunications – Transmitter and receiver at separate stations
Patent
1993-12-23
1995-01-31
Kuntz, Curtis
Telecommunications
Transmitter and receiver at separate stations
455 69, 455 88, H04Q 700, H04B 700
Patent
active
053865898
ABSTRACT:
In order to provide for a mobile communication network of a cellular type a transmission power control system capable of keeping a signal quality constant, an average bit error rate y is measured on a receiving side in connection with a communication channel being in use (step 100). If the average bit error rate y is not greater than a first rate threshold value LV1, transmission power is decreased by a predetermined amount on a transmitting side (step 102). If the average bit error rate y is not less than a second rate threshold value LV2 which is greater than the first rate threshold value LV1 (step 103), the transmission power is increased by the predetermined amount on the transmitting side (step 104). Preferably, an average reception level is additionally measured to adjust the transmission power when the bit error rate is less or greater than the first or the second rate threshold value. The first and/or the second rate threshold value is adaptively adjusted by counting the number of times by which the bit error rate exceeds a predetermined maximum allowable rate. It is possible to use an average carrier to interference ratio with threshold ratio values substituted for the threshold rate values and with a predetermined minimum allowable ratio used.
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A. N. Rosenberg, "Simulation of Power Control and Voice-Channel Selection in Cellular Systems", 35th IEEE Vehicular Technology Conference, Colorado, May 1985, pp. 12-15.
S. Kozono et al., "Cochannel Interference Measurement in Mobile Radio Systems", 35th IEEE Vehicular Technology Conference, May 1985, pp. 60-66.
T. Fujii et al., "Reduction of Cochannel Interference in Cellular Systems . . . Power Control", 38th IEEE Vehicular Technology Conference, Jun. 1988, pp. 668-672.
Kuntz Curtis
NEC Corporation
Vo Nguyen
LandOfFree
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