D2D PSDCH Power Control via Reception Sum Threshold
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Solution Overview
Problem
In wireless communication systems supporting device-to-device (D2D) communication, there is a challenge in controlling signal transmission power to mitigate interference due to the selection of redundant resources and in-band interference, particularly in scenarios with high UE density and mobility, where resource collisions are likely to occur.
Innovation Solution
A method where User Equipment (UE) calculates the sum of reception intensities of physical sidelink discovery channel (PSDCH) signals within a specific interval and adjusts transmission power accordingly, transmitting with maximum power if the sum is below a threshold or controlled power if it exceeds the threshold, to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE transmits PSDCH with maximum transmission power to ensure discovery signal reachability, then the coverage and reliability of D2D discovery are improved, but interference to other UEs and in-band interference increase significantly
Solution Approach 1:
The patent implements dynamic transmission power control where UE adjusts PSDCH transmission power based on real-time sensing of received PSDCH intensities from other UEs. The transmission power is modified by a power control parameter that is dynamically determined from the sensed environmental conditions, enabling the system to adapt between maximum power (for reliability) and reduced power (for interference mitigation) based on current network density and interference levels.
Solution Approach 2:
The patent employs a feedback mechanism where UE continuously senses the reception intensities of PSDCH signals from other UEs in the environment. This sensed information serves as feedback that is used to adjust the transmission power of subsequent PSDCH transmissions. The feedback loop enables the system to respond to changing network conditions and maintain optimal power levels that balance reliability and interference.
2Object-generated harmful factors
If UE transmits PSDCH with controlled power to reduce interference, then the signal-to-interference ratio for other UEs is improved, but the reachability and reliability of discovery signals decrease
Solution Approach 1:
The system dynamically adjusts transmission power based on sensed environmental conditions. When network density is low and interference levels are acceptable, UE transmits at maximum power to ensure reachability. When network density increases and interference becomes problematic, UE reduces power accordingly. This dynamic adjustment resolves the contradiction by making power level dependent on real-time conditions rather than fixed.
Solution Approach 2:
The patent changes the transmission power parameter based on sensed PSDCH reception intensities. By modifying the power parameter dynamically according to environmental conditions (number of active UEs, interference levels), the system achieves both interference reduction and maintained reachability. The power control parameter acts as the variable that is adjusted to balance the two opposing requirements.
3Adaptability or versatility
If UE senses and calculates sum of reception intensities to determine transmission power, then adaptive power control is achieved, but computational complexity and processing requirements increase
Solution Approach 1:
The patent implements a simplified sensing approach where UE measures and sums the reception intensities of PSDCH signals within a defined time window. Rather than performing complex analysis of all received signals, the system focuses on the essential measurement (sum of intensities) that is sufficient for power control decisions. This partial action approach achieves adaptive control without excessive processing complexity.
4Reliability
If UE transmits PSDCH repeatedly in discovery resource pool to improve detection probability, then the reliability of discovery is enhanced, but resource consumption and interference accumulation increase
Solution Approach 1:
The patent applies dynamic power control to repeated PSDCH transmissions within the discovery resource pool. Instead of transmitting all repeated signals at maximum power, UE adjusts the power of each transmission based on sensed conditions. This reduces total energy consumption while maintaining detection probability, as later transmissions can be at lower power if earlier transmissions were successful or if network density is low.
Data Source
AI summary
Disclosed are a method for controlling power and an apparatus therefor in a wireless communication system supporting device-to-device (D2D) communication. Specifically, a method for a terminal for controlling the transmission power of a physical sidelink discovery channel (PSDCH) in a wireless communication system supporting D2D communication comprises the steps of: calculating the sum of reception strengths of the total number of PSDCHs received from a set PSDCH reception period; and transmitting the PSDCH, wherein if the sum of reception strengths of the total number of PSDCHs is greater than a previously set threshold value, then the PSDCH to be transmitted is transmitted under the transmission power controlled by the terminal, and if the sum of reception strengths of the total number of PSDCHs is less than a previously set threshold value, then the PSDCH to be transmitted can be transmitted under the maximum transmission power.