Digital radio link system and a method of adjusting the transmission power in a digital radio link system
First Claim
1. A method of adjusting transmission power in a digital radio link system, comprising the stepstransmitting a digital signal from a transmitting end of the link system at a normal transmission power value less than a maximum transmission power value.receiving said digital signal at a receiving end of the link system, said received digital signal having at times errors and signal level changes;
- detecting and monitoring the rate of change of the received signal level and the rate estimate of errors at the receiving end; and
increasing the transmission power value at the transmitting end to a first value between the normal transmission power value and the maximum transmission power value at times when either the error rate estimate or the rate of change of the received signal level in the alternative exceeds a respective predetermined threshold value.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a digital radio link system and a method of adjusting the transmission power in a digital radio link system. The system comprises at a receiving end a first means for monitoring the error rate estimate and for producing a first control signal if the error rate estimate exceeds a predetermined threshold value. At a transmitting end the system comrises means for adjusting the transmission power, said means responding to the occurrence of the first control signal by increasing the transmission power. In the system of the invention there is further provided at the receiving end a second means for monitoring the rate of change of the received signal level and for producing a second control signal if the rate of change exceeds a predetermined threshold value. The means for adjusting the transmission power respond to the occurrence of the first or the second control signal by increasing the transmission power temporarily close to the maximum transmission power.
94 Citations
15 Claims
-
1. A method of adjusting transmission power in a digital radio link system, comprising the steps
transmitting a digital signal from a transmitting end of the link system at a normal transmission power value less than a maximum transmission power value. receiving said digital signal at a receiving end of the link system, said received digital signal having at times errors and signal level changes; -
detecting and monitoring the rate of change of the received signal level and the rate estimate of errors at the receiving end; and increasing the transmission power value at the transmitting end to a first value between the normal transmission power value and the maximum transmission power value at times when either the error rate estimate or the rate of change of the received signal level in the alternative exceeds a respective predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A digital radio link system having a transmitting end and a receiving end, comprising:
-
a transmitter at the transmitting end for transmitting digital signals at adjustable power values; means at the transmitting end for at times adjusting the transmitting power values between a normal power value and a maximum power value; a receiver at the receiving end for receiving said digital signals, said received digital signals at times having errors and different signal levels; first means at the receiving end for detecting and monitoring an estimate of the error rate of the received digital signals; second means at the receiving end for detecting and monitoring a rate of change of the level of the received digital signals; first control signal producing means at the receiving end governed by the first detecting and monitoring means for producing a first control signal at times when the estimate of the error rate exceeds a first predetermined threshold value; and a second control signal producing means at the receiving end for producing a second control signal at times when the rate of change of the level of the received signal exceeds a second predetermined threshold value; the means for adjusting the transmitting power value including at the transmitting end, means responsive to the reception of either one of the first and second control signals in the alternative for increasing the adjustable power value to a value between the normal power value and the maximum power value. - View Dependent Claims (13, 14, 15)
-
Specification