Non-Regenerative Relay Power Control for SINR-Limited Coverage
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Solution Overview
Problem
Non-regenerative relay in wireless communications amplifies both relayed signals and unnecessary signals, leading to a deterioration of the signal-to-interference noise power ratio (SINR) for non-target terminals, especially in uplink and downlink communications.
Innovation Solution
A communication system that includes a control apparatus to manage relay power, ensuring that the signal-to-interference noise power ratio (SINR) conditions are met by limiting relay power to within specific reference values, thereby suppressing noise and interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If non-regenerative relay is performed without power control, then relay transmission distance is extended, but SINR of reception signals for other terminals deteriorates due to amplified noise and interference
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the relay power value based on SINR conditions. The relay station changes its transmission power parameter according to whether the transmitted signal meets a first SINR condition and whether the received signal meets a second SINR condition, thereby optimizing both coverage area and SINR performance.
Solution Approach 2:
The patent implements feedback mechanisms where the relay station monitors SINR conditions of both transmitted and received signals. Based on this feedback, the relay power value is adjusted to maintain optimal SINR levels for both relayed and non-relayed signals, preventing SINR deterioration while extending coverage.
2Area of stationary object
If relay power is increased to extend coverage, then communication service area expands, but noise and interference amplification increases
Solution Approach 1:
The patent controls the relay power value parameter within specific limits based on SINR conditions. By adjusting this parameter dynamically, the system extends coverage area while preventing excessive noise and interference amplification that would occur with uncontrolled power increases.
Solution Approach 2:
The patent converts the potentially harmful effect of noise and interference amplification into a beneficial control mechanism. By monitoring SINR conditions and adjusting relay power accordingly, the system uses the presence of noise and interference as feedback to optimize power levels, thereby extending coverage without excessive harmful amplification.
3Reliability
If relay station amplifies all received signals, then relay transmission reliability improves, but SINR of non-relayed signals deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the treatment of relayed signals versus non-relayed signals. The relay station applies selective amplification based on SINR conditions, providing enhanced reliability for relayed signals while controlling the amplification impact on non-relayed signals to prevent SINR deterioration.
Solution Approach 2:
The patent changes the relay power parameter based on specific SINR conditions for different signal types. By adjusting this parameter dynamically, the system maintains high reliability for relayed signals while preventing SINR deterioration for non-relayed signals through controlled amplification levels.
Data Source
AI summary
A communication system includes a first communication station, a second communication station, a relay station to non-regenerative-relay communications between the first communication station and the second communication station, and a control apparatus. The relay station relay-transmits a relay wave with a relay power value of such a limit as to fulfill a second condition when a transmission wave being transmitted from the first communication station and being relay-transmitted by the relay station fulfills a first condition about a signal-to-interference noise power ratio (SINR) and when the relay wave being relay-transmitted by the relay station and reaching the second communication station fulfills the second condition about the signal-to-interference noise power ratio (SINR) and the relay power value in the relay station.