Uplink Power Control via Downlink Reference Signal Measurement
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Solution Overview
Problem
Current wireless communication systems, particularly those using new radio (NR) technologies, face challenges in optimizing uplink power control to ensure adequate signal quality and minimize interference, especially in multi-beam operations where path loss and interference are beam-specific and not reciprocal with downlink signals.
Innovation Solution
The method involves providing power control parameters to user equipment (UE) for uplink transmit power control, using reference signals transmitted by base stations via downlink beams for measurement, and adapting power control based on channel state information to ensure optimal transmit power while minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If downlink reference signals are used for uplink power control, then power control simplicity is improved, but measurement accuracy deteriorates due to non-reciprocity between downlink and uplink channels
Solution Approach 1:
The patent inverts the traditional approach by having the base station measure uplink reference signals from the UE and use those measurements for uplink power control, rather than having the UE measure downlink signals. This inversion resolves the non-reciprocity issue because the base station directly measures the uplink channel quality, ensuring accurate path loss estimation while maintaining relatively simple power control mechanisms.
2Reliability
If beam-specific path loss measurement is implemented, then signal quality is improved, but device complexity increases due to multiple measurements and parameter management
Solution Approach 1:
The patent applies local quality by implementing beam-specific path loss measurements where each beam pair (base station beam, UE beam) has its own dedicated reference signals and measurements. This ensures that power control is optimized for each specific beam direction and spatial path, improving signal quality for beamformed communications while confining the complexity to only the necessary beam-specific parameters rather than requiring comprehensive system-wide measurements.
Data Source
AI summary
Certain aspects of the present disclosure relate to methods and apparatus for uplink power control using communications systems operating according to new radio (NR) technologies. For example, a method for wireless communication by a base station includes providing power control parameters, to at least one user equipment (UE), for use in performing uplink transmit power control for one or more uplink transmissions sent using one or more uplink transmit beams, signaling the UE to set or reset one or more of the power control parameters, and transmitting one or more reference signals (RSs) using one or more downlink transmit beams, for the UE to measure for use in the uplink transmit power control.