Spread Spectrum Retransmission Power Control Using Capture Effect
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Solution Overview
Problem
Existing wireless communication systems using spread spectrum face challenges in minimizing power consumption and improving transmission success rates, particularly during retransmissions, due to increased power consumption and collisions in nodes using channel bonding technologies.
Innovation Solution
A power control method and apparatus that adjusts transmission power based on the capture effect by controlling the signal intensity difference between retransmitted signals, using random power settings and standby modes to optimize power usage and improve transmission success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased during retransmission to improve transmission success rate, then transmission success rate is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic transmission power adjustment based on channel conditions and node priority. Instead of using fixed high power for all retransmissions, the system adaptively selects transmission power levels (e.g., full power, half power, quarter power) according to real-time channel quality indicators and node priority levels, thereby achieving reliable transmission while minimizing unnecessary power consumption.
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on channel conditions and node priority. The system adjusts power levels from full power to fractionally reduced power (1/2, 1/4, 1/8) depending on whether the channel is good or bad and the priority of the transmitting node, optimizing the balance between transmission success rate and power consumption.
2Productivity
If channel bonding technology is used to increase data transmission rate, then data transmission rate is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts transmission power based on the actual channel conditions and data requirements. When channel bonding is used for high-speed transmission, the system monitors channel quality and node priority to determine appropriate power levels, reducing power consumption during high-rate transmissions when channel conditions permit, thereby achieving high productivity without proportional power consumption increase.
3Ease of operation
If multiple nodes transmit simultaneously using ALOHA protocol, then channel access is simplified, but transmission collision probability increases
Solution Approach 1:
The patent assigns different priority levels and corresponding transmission power characteristics to different nodes or data types. High-priority nodes use full power transmission with better collision resistance, while low-priority nodes use reduced power levels. This local differentiation in transmission quality helps resolve collisions through the capture effect, maintaining ALOHA's simplicity while improving overall transmission success rate.
4Use of energy by moving object
If transmission power is reduced to minimize power consumption, then power consumption is reduced, but transmission success rate decreases
Solution Approach 1:
The patent implements dynamic power adjustment that adapts to channel conditions. When channel conditions are good, the system uses reduced power levels to minimize consumption. When channel conditions deteriorate or node priority is high, the system increases power to maintain transmission success rate, thus dynamically optimizing the trade-off between power consumption and reliability.
Solution Approach 2:
The patent changes transmission power parameters based on channel quality indicators and node priority. The system transitions between different power states (full power, half power, quarter power) according to measured channel conditions, achieving low power consumption in good conditions while maintaining adequate transmission success rate when conditions require higher power.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption and enhances transmission success rates by leveraging the capture effect in wireless communication systems, particularly in nodes using spread spectrum, by optimizing power control protocols.
Implementation Method 1
a technology in which a channel bonding technology is used for high-speed data transmission has emerged... by controlling a difference in signal intensity between signals retransmitted from the transmission nodes... by maximizing a capture effect
Data Source
AI summary
A power control method for reducing power consumption of a terminal during retransmission in a wireless communication system using spread spectrum may include: transmitting a response message corresponding to a request message received from a base station to the base station; determining whether an acknowledgement (ACK) message is received from the base station in response to the response message; after the ACK message is received, determining whether the response message is decoded by the base station on the basis of the ACK message; and when it is determined that the response message is not decoded by the base station, setting retransmission transmission power randomly.