User equipment utilizing weighted open loop power control
View Patent ↗A user equipment (UE) employs weighted open loop power control by receiving a communication and measuring its received power level. Based on, in part, the received communication's power level and the communication's transmission power level, a path loss estimate is determined. A quality of the path loss estimate is also determined. The transmission power level for a communication from the UE is based, in part, on weighting the path loss estimate in response to the estimate's quality.
1. A user equipment (UE) employing a spread spectrum time division duplex technique using frames with time slots for communication, comprising:
means for receiving, in a first time slot, a first communication having a power level;
means for measuring a power level of the first communication;
means for determining a path loss estimate based in part on the measured power level and the received power level;
means for determining a long term path loss estimate based on prior path loss estimates;
means for setting a transmission power level for a second communication in a second time slot based in part on the path loss estimate weighted by a first factor and the long term path loss estimate weighted by a second factor, wherein the first and second factors are a function of a time separation of the first and second time slots; and
means for transmitting the second communication in the second time slot at the set transmission power level.
2. The user equipment of claim 1 wherein said means for determining the long term path loss estimate is responsive at least in part upon an average of path loss estimates of received communications.
3. A user equipment having its transmission power level controlled and using a spread spectrum time division duplex technique using frames with time slots for communication comprising:
antenna for receiving, during a first time slot, a first communication and transmitting an amplified second communication in a second time slot;
a power measurement device responsive to channel information for producing a measurement of a received power level of the first communication;
a pathloss estimation device responsive to the measured received power level for producing a pathloss estimate for the first communication;
a quality measurement device for producing a quality measurement based at least in part upon a time separation of the first time slot and a second time slot;
a transmit power calculation device responsive to the pathloss estimation and the quality measurement for producing a power control signal based at least in part upon the path loss estimate weighted by a first factor and a long term pathloss estimate weighted by a second factor, wherein the first and second factors are based in part on the quality measurement; and
an amplifier responsive to the power control signal and a second communication to be transmitted in the second time slot for amplifying the second communication as a function of the power control signal to produce the amplified second communication.