Subband Uplink Power Control for Frequency-Dependent Pathloss
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing frequency-dependent pathloss for uplink and downlink communications, particularly in optical wireless communication (OWC), where pathloss varies across different bandwidths and frequencies, leading to inconsistent power control.
Innovation Solution
Implementing subband-based uplink power control procedures, where the network entity divides the operational bandwidth into subbands and determines pathloss for each subband, allowing the UE to transmit uplink messages using subband-specific transmit powers based on measurements and configurations from the network entity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subband-based power control is implemented to address frequency-dependent pathloss variations, then power control precision is improved, but device complexity increases due to multiple power control procedures
Solution Approach 1:
The operational bandwidth is divided into multiple subbands, with each subband undergoing separate power control procedures. This segmentation allows precise compensation of frequency-dependent pathloss variations across different frequency ranges, while managing complexity through structured organization of multiple power control processes.
Solution Approach 2:
Different transmit powers are determined for different subbands based on their specific pathloss characteristics. Each subband receives localized power control treatment tailored to its frequency-dependent channel conditions, improving overall power control precision without requiring uniform complex processing across the entire bandwidth.
2Reliability
If multiple uplink power control procedures are performed for multiple subbands, then communication reliability is improved, but use of energy increases due to multiple power determination operations
Solution Approach 1:
The bandwidth segmentation into subbands enables targeted power control that improves communication reliability by addressing frequency-specific fading and pathloss. Energy is distributed across multiple power control operations, but each operates on a narrower frequency range, potentially reducing the total energy required compared to wideband approaches.
Solution Approach 2:
The network entity provides feedback regarding pathloss measurements for each subband, enabling the UE to adjust transmit powers accordingly. This feedback mechanism improves reliability by adapting to actual channel conditions while managing energy consumption through informed power decisions rather than exhaustive trials.
Data Source
AI summary
Methods, systems, and devices for wireless communications for a user equipment (UE) are described. The UE may receive an indication of a subband configuration for an operating bandwidth of the UE, the subband configuration indicating a division of the operating bandwidth into multiple subbands. The UE may perform multiple uplink power control procedures for the subbands to obtain subband-specific transmit powers for the subbands. The UE may transmit one or more uplink messages via the subbands using the subband-specific transmit powers obtained from the uplink power control procedures. In some examples, the UE may transmit uplink reference signals via the subbands, and receive, such as from a network entity, an indication of measurements corresponding to the reference signals. The UE may obtain the subband-specific transmit powers based on the measurements.