Sidelink Power Control Switching for Overlap-Aware UE Transmission
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Solution Overview
Problem
Existing sidelink power control techniques in wireless communications systems lead to reduced throughput and decreased reliability due to outdated downlink power control parameters, especially when sidelink transmissions are unlikely to interfere with uplink transmissions.
Innovation Solution
A framework for dynamically enabling or disabling downlink power control parameters at user equipment (UE) using Medium Access Control (MAC) CEs or Downlink Control Information (DCI) messages, allowing sidelink transmissions to be calculated without considering downlink power control parameters when sidelink resources do not overlap with uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If downlink power control parameters are used for sidelink transmission power determination, then interference between sidelink and uplink transmissions is reduced, but throughput and reliability decrease when sidelink resources do not overlap with uplink resources
Solution Approach 1:
The patent implements dynamic switching between two power control modes: using downlink power control parameters when sidelink resources overlap with uplink resources, and using autonomous sidelink power control when they do not overlap. The network entity configures both modes and dynamically indicates which mode to use via DCI or MAC CE signaling, allowing the system to adapt to varying resource allocation scenarios and maximize both interference reduction and reliability.
Solution Approach 2:
The patent changes the power control parameters based on resource overlap conditions. When overlap exists, downlink power control parameters (P0, alpha, pathloss) are applied to reduce interference. When no overlap exists, the system switches to sidelink-specific power control parameters determined autonomously by the UE based on sidelink channel conditions, thereby optimizing throughput and reliability for non-overlapping scenarios.
2Object-affected harmful factors
If downlink power control parameters are used for sidelink transmission power determination, then interference control is improved, but throughput decreases
Solution Approach 1:
The system dynamically selects the appropriate power control mode based on resource overlap indication. For non-overlapping resources, autonomous sidelink power control maximizes throughput by adapting to actual sidelink channel conditions without the conservative constraints of downlink parameters. For overlapping resources, downlink power control parameters are applied to prioritize interference control, thus dynamically optimizing the trade-off between throughput and interference control.
Solution Approach 2:
The patent changes power control parameters based on the resource overlap condition. When resources do not overlap, sidelink-specific parameters (P0_SL, alpha_SL) are used to maximize throughput. When resources overlap, downlink parameters (P0_DL, alpha_DL) are used to control interference, thereby adapting parameters to the specific operational context to avoid unnecessary throughput degradation.
3Productivity
If autonomous sidelink power control is used, then throughput is improved, but interference control worsens when resources overlap
Solution Approach 1:
The patent implements a dynamic switching mechanism where the UE autonomously determines power control mode based on resource overlap indication from the network. When overlap is detected, the system switches to downlink power control mode to prioritize interference control. When no overlap is detected, the system uses autonomous sidelink power control to maximize throughput, thus dynamically balancing the two objectives.
4Object-affected harmful factors
If downlink power control parameters are always used, then interference control is maintained, but adaptability to different resource allocation scenarios decreases
Solution Approach 1:
The patent makes the power control system dynamic by introducing mode switching based on resource overlap conditions. The network entity configures both downlink-based and autonomous power control modes, and dynamically indicates which mode to use via DCI or MAC CE. This allows the system to adapt to different resource allocation scenarios (overlapping or non-overlapping) while maintaining interference control when needed, thereby achieving both interference control and adaptability.
Solution Approach 2:
The system changes power control parameters based on the operational scenario. For overlapping resources, downlink parameters are applied to control interference. For non-overlapping resources, sidelink-specific parameters are used to optimize performance. This parameter adaptation enables the system to maintain interference control when necessary while being versatile across different resource allocation scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive control information from a network entity. The control information may indicate one or more sidelink resources allocated to the first UE for sidelink communications. The first UE may also receive an indication from the network entity that use of downlink power control parameters in determination of a sidelink transmission power for the sidelink communications may be disabled at the first UE. The first UE may transmit a sidelink message to a second UE using at least one sidelink resource of the one or more sidelink resources and with the sidelink transmission power determined at the first UE in accordance with the indication.