Base Station Power Allocation for Relay and Direct Terminals
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Solution Overview
Problem
The existing radio communication systems using relay stations face efficiency issues due to signal attenuation at higher frequency bands, leading to degraded reception performance for terminal apparatuses far from the base station, especially when using superposition coding techniques.
Innovation Solution
The system employs a base station apparatus that generates and transmits signals with different power coefficients for direct and relayed terminal apparatuses, allowing for multiplexing of signals addressed to terminal apparatuses that directly communicate with the base station and those that communicate via a relay station, optimizing transmission power distribution to prevent efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If superposition coding is applied to relay systems to transmit two frames in one frame period, then transmission efficiency is improved, but reception performance degrades for terminal apparatuses far from the base station due to signal attenuation at higher frequency bands
Solution Approach 1:
The patent applies local quality by differentiating power allocation based on terminal location and communication path. Terminals directly communicating with the base station receive signals at higher power, while terminals communicating via relay stations receive signals at lower power. This localized power quality adjustment ensures that each terminal receives adequate signal strength according to its specific reception conditions, resolving the contradiction between transmission efficiency and reception performance.
Solution Approach 2:
The patent changes the power parameter dynamically based on terminal apparatus location and communication path. By adjusting power coefficients according to whether a terminal is in direct communication or relayed communication, the system optimizes both transmission efficiency (by reducing unnecessary high-power transmissions) and reception performance (by ensuring adequate power for distant terminals).
2Reliability
If transmission power is increased to improve reception performance for distant terminals, then reception performance is improved, but transmission efficiency decreases due to higher energy consumption and interference
Solution Approach 1:
The patent implements local quality by allocating different power levels to different terminal groups based on their communication paths. Direct communication terminals receive higher power signals, while relayed communication terminals receive lower power signals. This prevents unnecessary high-power transmissions to all terminals, thereby maintaining transmission efficiency while ensuring adequate reception performance for each terminal group.
Solution Approach 2:
The patent applies partial action by transmitting signals at different power levels rather than uniformly high power to all terminals. By providing just enough power for each terminal's specific needs (higher for direct terminals, lower for relayed terminals), the system avoids excessive power consumption and interference while maintaining adequate reception performance.
Data Source
AI summary
In a radio communication system including a base station apparatus 10, a relay station apparatus 20 that receives a signal transmitted from base station apparatus 10 and re-transmits the signal to terminal apparatuses, a terminal apparatus 30 that directly receives the signal transmitted from the base station apparatus and a terminal apparatus 32 that receives the signal transmitted from base station apparatus 10 via relay station apparatus 20, base station apparatus 10 sets the transmission power of a signal addressed to terminal apparatus 30 high and the transmission power of a signal addressed to terminal apparatus 32 low, adds up the signals and transmits the resultant signal. With this, the signal addressed to the terminal apparatus that directly communicates with the base station apparatus and the signal addressed to the terminal apparatus that communicates with the base station apparatus via the relay station apparatus are multiplexed and transmitted simultaneously, whereby it is possible to provide a radio communication system and the like that enable efficient communication.


