Mobile Station Subcarrier Power Control for Relay Networks
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Solution Overview
Problem
Mobile stations used as relay stations in ad-hoc networks experience increased power consumption, which is a challenge in maintaining efficient communication systems, especially when using high-frequency radio bands that require a larger number of base stations due to reduced coverage areas.
Innovation Solution
A mobile station apparatus that transmits multicarrier signals with controlled transmission power based on channel quality between the mobile station, relay station, and base station, optimizing power usage by adjusting subcarrier transmission power to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a mobile station is used as a relay station in an ad-hoc network, then communication coverage is extended and base station requirements are reduced, but power consumption of the mobile station increases
Solution Approach 1:
The patent segments the transmission power control into individual subcarrier-level control. Instead of uniformly controlling power across all subcarriers, the system divides the multicarrier signal into separate subcarriers and applies independent power control to each, allowing selective power allocation based on channel conditions for relay communication
Solution Approach 2:
The patent implements local quality by adjusting transmission power based on specific channel conditions. The control section measures channel quality between the relay station and base station, and selectively increases power only for subcarriers experiencing poor channel conditions, rather than uniformly increasing power across all subcarriers
Solution Approach 3:
The patent applies dynamics through adaptive power control that continuously adjusts transmission parameters. The control section dynamically modifies transmission power for each subcarrier based on real-time channel quality measurements, enabling the system to adapt to changing communication conditions and optimize power consumption
2Productivity
If high-frequency radio band is used to achieve high transmission rate, then data transmission capability is improved, but attenuation due to transmission distance increases
Solution Approach 1:
The patent changes transmission parameters by adjusting power allocation across different subcarriers. By modifying the power parameter individually for each subcarrier based on channel quality, the system optimizes signal strength at the receiver while minimizing overall power consumption, addressing the attenuation issue in high-frequency bands
Data Source
AI summary
A mobile station wherein the power consumption can be suppressed. In a frame 3, this mobile station (100) transmits, to both a base station (200) and a relay station (150), a multicarrier signal comprising a plurality of subcarriers that have been controlled in transmission power on the basis of reception quality information 1 (Processes (3) and (3)′: first transmission). In a frame 4, the mobile station (100) transmits, only to the base station (200), a multicarrier signal comprising a plurality of subcarriers that have been controlled in transmission power on the basis of reception quality information 2 (Process (5): second transmission). In this case, the mobile station (100) selects subcarriers in which reception qualities indicated by the reception quality information 2 are lower than a target quality, and the mobile station (100) then transmits, to the base station (200), a multicarrier signal comprising only those subcarriers in which the reception qualities are lower than the target quality.