Terminal D2D Power Control in Carrier Aggregation
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Solution Overview
Problem
The integration of cellular and Device-to-Device (D2D) communications in a carrier aggregation environment faces challenges such as transmission power allocation, timing mismatches, and self-interference, which affect the stability and efficiency of both cellular and D2D communications.
Innovation Solution
A communication method and apparatus for a terminal in a wireless communication system that checks and manages data transmissions based on cellular and D2D communications on different carriers, reduces D2D transmission power to a predetermined level when cellular communication is absent, and recovers this reduction when cellular communication resumes, while determining priorities and transmission powers for D2D communications based on service types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D transmission power is increased to improve D2D communication quality, then D2D communication stability is improved, but cellular communication may be interfered with and cellular communication stability deteriorates
Solution Approach 1:
The patent dynamically adjusts D2D transmission power based on cellular communication status by changing the power parameter. When cellular communication is detected, D2D power is reduced to a predetermined level; when cellular communication is absent for a predetermined period, D2D power is recovered to normal levels. This parameter change resolves the contradiction by making D2D power adaptive to cellular communication conditions.
2Object-affected harmful factors
If D2D transmission power is reduced to minimize interference, then interference to cellular communication is reduced, but D2D communication stability deteriorates
Solution Approach 1:
The patent implements dynamic power adjustment where D2D transmission power is not fixed but changes based on cellular communication detection. The system transitions between two power states: reduced power when cellular communication is present, and normal power when cellular communication is absent for a predetermined period. This dynamic behavior resolves the contradiction by optimizing power levels according to real-time conditions.
3Productivity
If carrier aggregation is used to combine cellular and D2D communications, then resource utilization is improved, but transmission power allocation becomes complex
Solution Approach 1:
The terminal performs self-service by autonomously detecting cellular communication status and automatically adjusting D2D transmission power without requiring complex centralized power allocation algorithms. The terminal monitors for cellular communication signals and independently decides when to reduce or recover D2D power based on predetermined conditions, simplifying the power allocation complexity while maintaining efficient resource utilization.
Data Source
AI summary
The present invention relates to a 5G or pre-5G communication system which is to be provided to support high data throughput beyond a 4G communication system such as LTE. The communication method for a terminal in a wireless communication system supporting carrier aggregation according to the present invention comprises the steps of: confirming data transmission between different carriers is carried out on the basis of cellular and device-to-device (D2D) communication; reducing the transmission power for a D2D communication-based data transmission to a configured value; and, if no cellular communication-based data transmission occurs during a set time, then restoring the reduced transmission power for the D2D communication-based data transmission.