Relay Node Power Control for FDM/SDM Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In next-generation wireless communication systems, there is a challenge in minimizing interference between signals transmitted and received by relay nodes, particularly in scenarios where frequency division multiplexing (FDM) or spatial division multiplexing (SDM) is used, due to differences in transmission power levels between downlink (DL) and uplink (UL) signals.
Innovation Solution
A method and apparatus for a relay node that receives transmission power information for a DL signal from a parent node, and transmits both the DL and UL signals based on this information, ensuring that the power difference between the DL and UL signals does not exceed a threshold, thereby controlling interference through multiplexing in FDM or SDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power levels for DL and UL signals are not controlled, then the relay node can transmit signals without power constraints, but interference between multiplexed signals increases significantly
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission power levels of DL and UL signals based on calculated power differences. The relay node compares the magnitude of transmission power between DL and UL signals and modifies at least one power level to maintain their difference within a predetermined threshold, thereby reducing interference while managing power control complexity through systematic parameter adjustment.
Solution Approach 2:
The patent implements feedback mechanisms where the relay node continuously monitors the transmission power levels of DL and UL signals, calculates the power difference, and uses this feedback information to adjust power levels accordingly. This closed-loop control ensures that the power difference remains within acceptable thresholds, effectively minimizing interference between multiplexed signals.
2Reliability
If power difference between DL and UL signals is not limited, then transmission can be simpler, but signal quality deteriorates due to increased interference
Solution Approach 1:
The patent maintains signal quality by dynamically adjusting transmission power parameters. The relay node calculates the power difference between DL and UL signals and modifies power levels to keep this difference within a predetermined threshold, ensuring reliable signal transmission while minimizing interference in FDM or SDM multiplexing scenarios.
3Power
If maximum transmission power is allocated to one signal, then that signal achieves optimal power level, but the other signal suffers from power deficiency
Solution Approach 1:
The patent balances power distribution by dynamically adjusting the transmission power parameters of both DL and UL signals. The relay node monitors the power magnitude of each signal and modifies at least one power level to maintain the power difference within a predetermined threshold, ensuring that neither signal dominates excessively and both achieve adequate power levels for reliable transmission.
Data Source
AI summary
The present invention relates to a wireless communication system and, specifically, provides a communication method and an apparatus therefor, in which: transmission power information relating to a first downlink (DL) signal is received from a parent node; the first DL signal is transmitted to a child node on the basis of the transmission power information; a first uplink (UL) signal is transmitted to the parent node on the basis of the transmission power information; the first DL signal and the first UL signal are multiplexed by frequency division multiplexing (FDM) or spatial division multiplexing (SDM); the transmission power information includes a maximum transmission power value of the first DL signal; and a magnitude of a transmission power of one of the first DL signal and the first UL signal is adjusted so that the magnitude of the transmission power of the first DL signal and the magnitude of the transmission power of the first UL signal do not differ by a value equal to or greater than threshold value.