Sidelink Power Control Using CSI Feedback and Pathloss

The patent implements dynamic transmit power control by changing the power parameter based on measured pathloss conditions. Each UE adjusts its transmit power according to the specific pathloss experienced in its communication link, rather than using fixed or uniform power levels. This parameter adaptation allows reliable communication at appropriate power levels while minimizing excessive interference to other UEs in the sidelink network.

The patent establishes a feedback mechanism where UEs measure the pathloss of received signals and report this information back to the transmitting UE. The transmitting UE uses this feedback to calculate and adjust its transmit power for subsequent communications. This closed-loop feedback system enables continuous optimization of transmit power to maintain communication reliability while adapting to changing interference conditions.

The patent enables UEs to autonomously measure pathloss using their own received signals and independently calculate the required transmit power adjustments. Each UE performs self-service pathloss measurement and power control calculations without requiring complex centralized coordination or additional dedicated measurement signals from the network, thereby reducing overall system complexity while achieving interference reduction.

The patent utilizes existing sidelink control channels and reference signals for multiple purposes: they serve both for data/control transmission and for pathloss measurement. By making these existing signals multi-functional, the patent avoids the need for additional dedicated measurement channels or signaling elements, thereby implementing pathloss-based power control without significantly increasing system complexity.