Dynamic CTS Power Control for Sidelink Interference Management
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Solution Overview
Problem
Current wireless communication systems face challenges in managing interference in sidelink communications, particularly in dynamically adjusting the interference protection zone to optimize communication efficiency and throughput.
Innovation Solution
A method is introduced where a dynamic clear-to-send (CTS) transmit power scaling parameter is used to adjust the size of the interference protection zone around sidelink receivers, allowing for dynamic variability based on received RTS channel power, enabling efficient interference management and power control for sidelink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed CTS power control parameter is used, then device complexity is reduced, but adaptability to different communication conditions deteriorates
Solution Approach 1:
The patent implements dynamic CTS power control where the transmit power is adjusted based on received signal strength measurements and channel conditions. The CTS power is no longer fixed but dynamically adapted to current communication requirements, allowing the system to respond to varying channel quality, interference levels, and distance between devices.
Solution Approach 2:
The patent introduces a feedback mechanism where the receiving device measures the received signal strength of the RTS message and uses this information to determine the appropriate CTS transmit power. This closed-loop feedback enables the system to automatically adjust power levels based on actual channel conditions without requiring complex centralized control.
2Reliability
If CTS transmit power is increased, then interference protection is improved, but spatial reuse capability deteriorates
Solution Approach 1:
The patent applies local quality by adjusting CTS transmit power on a per-link basis rather than using a uniform power level across all sidelink communications. Each receiving device determines its own CTS power based on its specific channel conditions, distance from the transmitting device, and measured signal strength, thereby providing interference protection only in the local area where it is necessary.
Solution Approach 2:
The patent changes the power parameter dynamically based on channel conditions, converting a static power control approach into a variable one. The CTS transmit power is adjusted as a function of received signal strength, path loss, and channel quality indicators, allowing the system to optimize the balance between interference protection and spatial reuse for each specific communication scenario.
3Productivity
If dynamic CTS power scaling is implemented, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service power control where each device independently determines its own CTS transmit power based on measurements it performs locally. The receiving device measures the RTS signal strength, calculates the appropriate power level using predefined formulas or lookup tables, and transmits the CTS message at that power without requiring external control or complex coordination with other devices.
Data Source
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AI summary
A first device may configure a second device, such as a sidelink receiver, so that an interference protection zone surrounding the second device may be dynamically adjusted in size based, for example, on various objectives and/or use cases recognized by the first device. The interference protection zone may be, for example, an area surrounding the second device, within which neighboring devices may be silenced. Changes to the interference protection zone may be achieved by providing a dynamic clear-to-send (CTS) transmit power scaling parameter, that is different from a pre-assigned constant parameter for CTS power control stored at the second device, to the second device from the first device. The second device may calculate CTS channel power using at least the dynamic CTS transmit power scaling parameter and the received RTS channel power. The second device may send a CTS message in a CTS channel at the calculated CTS channel power.