Device-to-Device Power Control via Footroom Reporting
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently determining and managing transmission power for direct device-to-device communication, particularly in LTE systems, which can lead to interference and suboptimal performance due to inadequate power control mechanisms.
Innovation Solution
The proposed solution involves a method for efficiently transmitting and receiving synchronization signals in direct device-to-device communication by setting a minimum transmission power and using power footroom reports to dynamically adjust transmission power within set limits, ensuring optimal interference management and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transmission power is increased to improve coverage in direct device-to-device communication, then coverage area is improved, but interference to other devices increases
Solution Approach 1:
The patent implements dynamic transmission power adjustment where each device reports its available power range (power footroom) and the base station dynamically determines the optimal transmission power for direct device-to-device communication. This allows the system to adapt transmission power to actual communication needs rather than using fixed high power, thereby improving coverage when needed while reducing interference when not required.
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on device reports and base station determination. By adjusting the power level parameter according to the specific communication scenario and available power footroom, the system optimizes the balance between coverage and interference reduction.
2Object-generated harmful factors
If transmission power is dynamically adjusted to reduce interference, then interference is reduced, but coverage may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where devices report their available transmission power range (power footroom) to the base station. The base station uses this feedback information to determine appropriate transmission power levels for direct device-to-device communication, ensuring that power is adjusted to the minimum necessary level for successful communication while avoiding excessive interference.
3Device complexity
If power control mechanisms are simplified to reduce device complexity, then device complexity is reduced, but power management precision deteriorates
Solution Approach 1:
The patent enables devices to self-report their available power range (power footroom) without requiring complex centralized control. Each device autonomously determines and communicates its power capabilities to the base station, simplifying the overall control architecture while maintaining precise power management through the feedback mechanism.
Data Source
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AI summary
Disclosed is a method for performing, by a device, power reporting to a base station for a direct device to device communication in a wireless communication system. Specifically, the method comprises the steps of: receiving a transmit power control (TPC) command for a direct device to device communication from the base station; sending a direct device to device communication signal by determining the transmit power of a direct device to device communication according to the TPC command; and reporting the difference between the determined transmit power and a certain power to the base station.