Sidelink Power Control via Dynamic Parameter Selection
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink power control, particularly in scenarios where sidelink channels share resources with uplink channels, leading to potential interference and limited power usage.
Innovation Solution
The system employs multiple sets of power control parameters, with a base station signaling UE to use either uplink or sidelink pathloss-based parameters via DCI messages to determine optimal transmission powers, ensuring reduced interference and increased power efficiency by selecting the lower or higher power settings based on resource overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink channels share resources with uplink channels, then resource utilization efficiency is improved, but interference between sidelink and uplink communications increases
Solution Approach 1:
The patent changes the power control parameters dynamically based on the type of resource (first resource for sidelink, second resource for uplink). The base station configures different power control parameter sets (first power control parameters for sidelink, second power control parameters for uplink) and indicates which set to use via DCI messages, allowing optimization of transmission power for each channel type to reduce interference while maintaining resource sharing efficiency.
2Reliability
If transmission power is increased for sidelink messages, then communication reliability is improved, but interference with uplink communications increases
Solution Approach 1:
The patent implements dynamic parameter changes by configuring multiple power control parameter sets with different characteristics. The first power control parameters are optimized for sidelink reliability, while the second power control parameters are optimized for uplink performance. The base station dynamically selects and indicates the appropriate parameter set via DCI based on current channel conditions and interference levels, allowing the system to achieve reliable sidelink communication while minimizing uplink interference.
3Adaptability or versatility
If multiple sets of power control parameters are configured, then power control flexibility is improved, but system complexity increases
Solution Approach 1:
The patent segments the power control parameters into distinct sets (first power control parameters for sidelink, second power control parameters for uplink) with specific functions. Each parameter set contains dedicated parameters optimized for its intended channel type. This segmentation allows the system to manage complexity by organizing parameters into functional groups while maintaining the flexibility to switch between them based on communication needs.
Solution Approach 2:
The DCI message acts as an intermediary that carries the indication of which power control parameter set to use. This intermediary mechanism simplifies the user equipment's decision-making process by providing direct instructions from the base station, reducing the complexity of parameter selection while maintaining system flexibility. The base station's scheduling decision is transmitted through the DCI, coordinating the use of different parameter sets without requiring complex UE-side algorithms.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) that is configured with two sets of power control parameters may be signaled (e.g., via downlink control information (DCI)) as to which set of parameters to use for determining the transmission power on a sidelink channel. The UE may determine a transmit power for a sidelink message based on the indication included in the DCI. The base station may transmit the indication based on whether uplink or downlink communications are scheduled on resources that may overlap with resources used for transmission of the sidelink message.