Sidelink Power Control for MU-MIMO Signal Balancing
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Solution Overview
Problem
In wireless communications systems, particularly those supporting multi-user multiple input multiple output (MU-MIMO), signal distortions occur due to imbalanced power levels of sidelink messages received by a common communication device, leading to reduced throughput and performance.
Innovation Solution
Power control techniques are employed by communication devices to adjust the transmit power levels of UEs based on measured power levels, using control signaling or power control information to balance signal power levels and prevent distortions, with mechanisms to terminate MU-MIMO if power control fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs transmit sidelink messages simultaneously on the same resources to a common UE, then system throughput and resource utilization are improved, but signal power imbalance causes distortion and reduces performance
Solution Approach 1:
The patent implements power control by dynamically adjusting the transmit power parameter of sidelink messages. The common UE measures received power levels and sends power control adjustments to transmitting UEs, which then modify their transmit power to achieve balanced received power levels, eliminating distortion while maintaining simultaneous transmissions
Solution Approach 2:
The patent establishes a feedback loop where the common UE measures the received power levels of sidelink messages from different UEs, compares them against target power levels, and sends power control adjustment indications back to the transmitting UEs. This closed-loop control ensures continuous power balancing to maintain signal quality
2Reliability
If power control adjustments are implemented to balance signal levels, then signal distortion is reduced and reliability is improved, but additional control signaling is required increasing system complexity
Solution Approach 1:
The patent enables transmitting UEs to autonomously adjust their own transmit power levels based on power control adjustments received from the common UE. This self-service mechanism eliminates the need for the network to centrally control each transmission, reducing overall system complexity while maintaining power balance
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For example, a UE may determine a power control adjustment based on sidelink messages received from other UEs. The UE may transmit, to the other UEs, an indication of the power control adjustment to the other UEs. The other UEs may transmit additional sidelink messages in accordance with the power control adjustment, such that power levels of the additional sidelink message satisfy a threshold. A base station may indicate a power control adjustment to one or more UEs. For example, the base station may receive power control information associated with sidelink communications between a set of UEs. The base station may transmit an indication of a power adjustment parameter for a transmit power level for sidelink messages transmitted between two UEs of the set. The value of the power adjustment parameter may be based on the received power control information.