Mobile Station Transmit Power Control for D2D Interference
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Solution Overview
Problem
Current cellular network technologies face challenges in managing interference and optimizing transmit power for machine-to-machine (M2M) communications and peer-to-peer communications, particularly in direct device-to-device (D2D) scenarios, which affect network performance and interference levels.
Innovation Solution
The method involves controlling the transmit power of mobile stations using power control mechanisms that consider interference levels, signal-to-interference ratios, and propagation losses, allowing for optimal power adjustments to minimize interference and maximize communication efficiency in both uplink and downlink zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to improve communication coverage and reliability, then communication reliability is improved, but interference to other cellular users and D2D connections increases
Solution Approach 1:
The patent dynamically adjusts transmit power parameters based on communication conditions. The mobile station calculates required transmit power using path loss measurements and target SINR, then applies power control adjustments to maintain reliable communication while minimizing interference. This involves changing power parameters adaptively rather than using fixed power levels.
Solution Approach 2:
The patent implements closed-loop power control where the mobile station measures received signal quality, calculates path loss, determines required transmit power to achieve target SINR, and adjusts its transmit power accordingly. This feedback mechanism ensures communication reliability while preventing excessive interference by continuously adapting power levels based on actual channel conditions.
2Object-generated harmful factors
If transmit power is decreased to reduce interference, then interference is reduced, but communication throughput and coverage deteriorate
Solution Approach 1:
The patent adjusts transmit power parameters dynamically based on channel conditions, path loss measurements, and target SINR requirements. This ensures that power is reduced only when sufficient for maintaining communication quality, thereby minimizing interference while preserving throughput through adaptive rather than blanket power reduction.
Solution Approach 2:
The patent implements dynamic power control where transmit power levels change continuously based on real-time channel conditions, path loss variations, and interference measurements. This dynamic adjustment allows the system to maintain adequate throughput by increasing power when needed while reducing power to minimize interference when channel conditions permit.
3Object-generated harmful factors
If power control mechanisms are implemented for D2D communications, then interference to cellular network is reduced, but system complexity increases
Solution Approach 1:
The patent enables the mobile station to autonomously calculate its own required transmit power by measuring path loss from received signals, determining target SINR based on communication requirements, and adjusting its transmit power accordingly. This self-service approach reduces interference to the cellular network without requiring complex centralized power control infrastructure, as each device manages its own power independently based on local measurements.
Solution Approach 2:
The patent implements a feedback-based power control mechanism where the mobile station measures received signal strength, calculates path loss, determines required transmit power to achieve target SINR, and adjusts its power accordingly. This feedback loop reduces interference to cellular network operations while maintaining manageable system complexity through distributed rather than centralized control.
4Reliability
If path loss compensation is applied to maintain communication quality, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The patent adjusts transmit power parameters adaptively based on measured path loss and target SINR requirements. Rather than applying fixed path loss compensation that would increase energy consumption, the system dynamically changes power parameters only to the extent necessary to maintain communication quality, thereby reducing unnecessary energy consumption while preserving reliability.
Solution Approach 2:
The patent implements dynamic power adjustment where transmit power levels change continuously based on real-time path loss measurements and channel conditions. This dynamic approach ensures that energy is consumed only when and to the extent necessary for maintaining communication quality, avoiding the excessive energy consumption that would result from static or overly aggressive path loss compensation.
Data Source
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AI summary
Method and apparatus for controlling a transmit power of a mobile station are disclosed. Mobile stations in direct communication on a cross link (XL) receive control parameters from a base station. A first mobile station (a receiving mobile station) may calculate a correction parameter for power offset for transmissions from a second mobile station (a transmitting mobile station) to the first mobile station, and send it to the second mobile station. The correction parameter may be generated within the maximum and minimum limits. The second mobile station may calculate a transmit power level for a transmission to the first mobile station based on the correction parameter, measurements on resources allocated for cross links for mobile station-to-mobile station direct communications, an interference measurement received from the first mobile station, and a path loss to the first mobile station.