Weighted Pathloss Uplink Power Control for SRI-Based Antenna Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power control for sounding reference signal resource indicator (SRI) based antenna selection, which affects uplink communication quality and efficiency.
Innovation Solution
The proposed solution involves configuring a user equipment (UE) to receive a configuration for an SRS resource set associated with multiple antennas and using a weighted average of pathloss to determine transmit power for uplink communications, based on first and second SRIs, as indicated by downlink control information (DCI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional power control methods are used for SRI based antenna selection, then the system is simpler to implement, but the uplink power control accuracy deteriorates
Solution Approach 1:
The patent changes the parameter used for power control from single-antenna pathloss to a composite parameter that combines pathloss with antenna selection indicators (SRI). This allows the system to account for multiple antennas and their different channel conditions, improving power control accuracy without requiring a complete redesign of the power control mechanism.
Solution Approach 2:
The patent introduces an intermediary parameter that bridges the gap between simple traditional power control and complex multi-antenna power control. This intermediary parameter combines pathloss measurements with SRI information, allowing the base station to infer the selected antenna and adjust power control accordingly without requiring direct complex multi-antenna power control signaling.
2Reliability
If multi-antenna power control is implemented, then communication quality improves, but interference management becomes more difficult
Solution Approach 1:
The patent implements a feedback mechanism where the base station receives SRI information from the UE and uses this feedback to adjust power control parameters. This allows the system to adapt to the selected antenna's channel conditions and adjust transmit power to maintain communication quality while managing interference through informed power allocation.
Solution Approach 2:
The patent applies local quality by adjusting power control parameters specifically for each antenna based on its channel conditions and selection status. Instead of uniform power control across all antennas, the system tailors power levels to the specific antenna being used, improving communication quality while minimizing interference from other antennas.
3Productivity
If weighted average pathloss is used for power control, then power distribution efficiency improves, but calculation complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE calculate and report pathloss measurements for multiple antennas before the actual power control decision is made. This pre-calculation allows the base station to efficiently compute the weighted average pathloss when needed, improving power distribution efficiency without requiring complex real-time calculations during transmission.
Solution Approach 2:
The patent implements self-service by having the UE autonomously calculate pathloss measurements and prepare the necessary information for power control. This reduces the calculation burden on the base station and allows the UE to serve itself in preparing power control data, improving overall system efficiency while distributing computational tasks appropriately.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration for a sounding reference signal (SRS) resource set that includes a first SRS resource associated with a first SRS resource indicator (SRI) and a first antenna of the UE, and a second SRS resource associated with a second SRI and a second antenna of the UE. The UE may receive first downlink control information (DCI) that schedules a first uplink communication on a first uplink channel, wherein the first DCI indicates the first SRI. The UE may transmit, using the first antenna, the first uplink communication using a transmit power that is based at least in part on a weighted average of a first pathloss associated with the first antenna and a second pathloss associated with the second antenna. Numerous other aspects are described.