Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A transmission power control method for a CDMA (Code Division Multiple Access) system which controls transmission power of a mobile station on the basis of a transmission power control bit sent from a base station to the mobile station, said method characterized by comprising the steps of: measuring, at the mobile station, average received power per transmission power control period of a signal sent from the base station; detecting, at the mobile station, a power difference between the average received power of a current transmission power control period and that of one of previous transmission power control periods; deciding, at the mobile station, whether said power difference exceeds a predetermined reference power difference; setting, at the mobile station, transmission power of the mobile station in accordance with said power difference when said power difference exceeds said predetermined reference power difference, and in accordance with the transmission power control bit when said power difference is lower than the predetermined reference power difference.
Claim 2
Dependent Claim
100 words
The transmission power control method as claimed in claim 1, characterized by further comprising the steps of: calculating, at the base station, an SIR (Signal-to-Interference Ratio) of received power of a desired signal sent from the mobile station to a sum of interference power from other mobile stations and thermal noise power; deciding whether said SIR is greater than a reference value predetermined for satisfying a predetermined transmission quality; and inserting said transmission power control bit periodically into a forward (from base station to mobile station) frame in accordance with a result of decision at the preceding step of deciding.
Claim 3
Dependent Claim
166 words
A transmission power control apparatus for a CDMA (Code Division Multiple Access) system which controls transmission power of a mobile station on the basis of a transmission power control bit sent from a base station to the mobile station, said apparatus characterized by comprising: means for measuring, at the mobile station, average received power per transmission power control period of a signal sent from the base station; means for detecting, at the mobile station, a power difference between the average received power of a current transmission power control period and that of one of previous transmission power control periods; means for deciding, at the mobile station, whether said power difference exceeds a predetermined reference power difference; means for setting, at the mobile station, transmission power of the mobile station in accordance with said power difference when said power difference exceeds said predetermined reference power difference, and in accordance with the transmission power control bit when said power difference is lower than the predetermined reference power difference.
Claim 4
Dependent Claim
103 words
The transmission power control apparatus as claimed in claim 3, characterized by further comprising: means for calculating, at the base station, an SIR (Signal-to-Interference Ratio) of received power of a desired signal sent from the mobile station to a sum of interference power from other mobile stations and thermal noise power; means for deciding whether said SIR is greater than a reference value predetermined for satisfying a predetermined transmission quality; and means for inserting said transmission power control bit periodically into a forward (from base station to mobile station) frame in accordance with a result of decision at the preceding step of deciding.
Claim 5
Dependent Claim
78 words
A transmission power control method within a spread spectrum communication station wherein (i) in a first mode transmission power level is altered in response to commands received from another station, and (ii) in a second mode power level is altered in response to the received power level of a signal from the other station, the second mode being selected when said received power level varies rapidly in relation to a maximum power control rate of the first mode.
Claim 6
Dependent Claim
17 words
A transmission power control method or apparatus having the features of any combination of the preceding claims.