D2D Signal Relaying Power Control for Adjacent Frequency Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently relaying Device-to-Device (D2D) signals, particularly in chaotic environments, due to interference and power management issues between adjacent frequency signals.
Innovation Solution
A method where user equipment (UE) transmits and relays D2D signals by determining and adjusting the power levels based on reception power differences between adjacent frequency signals, including reducing interference by controlling transmit power and prioritizing message types, to optimize D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If D2D signals are transmitted on adjacent frequencies to increase communication capacity, then the quantity of communication channels increases, but interference between adjacent frequency signals increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power levels of D2D signals transmitted on adjacent frequencies. The transmitting UE determines appropriate power levels based on the reception power difference between adjacent frequency signals, ensuring that higher power is used when reception power difference is large (reducing interference) and lower power when reception power difference is small (preventing interference). This resolves the contradiction by changing the power parameter to maintain both high communication capacity and low interference.
2Reliability
If transmit power is increased to improve signal reliability, then communication reliability improves, but interference to adjacent frequency signals increases
Solution Approach 1:
The patent dynamically changes the transmit power parameter based on the reception power difference between adjacent frequency signals. When the reception power difference is large, higher transmit power is used to improve reliability without causing significant interference. When the reception power difference is small, lower transmit power is used to maintain reliability while minimizing interference. This adaptive parameter adjustment resolves the contradiction between reliability and interference.
Solution Approach 2:
The patent implements a feedback mechanism where the transmitting UE determines the reception power difference between adjacent frequency signals and uses this information to adjust its transmit power level. This feedback loop ensures that power levels are optimized based on actual channel conditions, achieving both high reliability and low interference by continuously adapting to the communication environment.
3Area of stationary object
If power levels are increased to extend communication range, then coverage area increases, but power consumption increases
Solution Approach 1:
The patent optimizes the power consumption parameter by adjusting transmit power levels based on the reception power difference between adjacent frequency signals. Instead of using high power levels unconditionally to extend coverage, the system dynamically sets power levels appropriate to the channel conditions. This achieves extended coverage when necessary while minimizing power consumption when lower power suffices, resolving the contradiction between coverage area and power consumption.
Data Source
AI summary
According to one embodiment of the present invention, a method by which a terminal for supporting device to device (D2D) communication relays a D2D signal comprises the steps of: transmitting, by the terminal, a D2D signal to be relayed to a neighboring terminal; and relaying a signal transmitted by the neighboring terminal, on the basis of the information on the D2D signal, wherein the information on the D2D signal includes information on D2D power, and the information on the D2D power can be determined by considering a reception power difference between D2D signals transmitted on mutually adjacent frequencies.