Repeater Terminal Contribution-Based Mode Switching
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Solution Overview
Problem
In ad-hoc wireless networks, multi-hop communication faces challenges with packet errors and power consumption due to the complexity of routing and the need for efficient data transmission between transmitter and destination terminals, especially when the distance is large or power levels drop due to fading.
Innovation Solution
A communication system that uses a repeater terminal to determine its contribution based on the number of packet data retransmissions and response signal retransmissions, entering a repeating mode for high contribution and a sleep mode for low contribution, while employing STBC encoding to improve diversity gain and reduce power wastage by selectively transmitting packet data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all repeater terminals simultaneously repeat packet data in ad-hoc network, then diversity gain is improved, but power consumption increases due to wasteful transmission by terminals that do not contribute to the communication path
Solution Approach 1:
The patent implements a feedback mechanism where the destination terminal sends response signals (ACK/NACK) back to the transmitter terminal through repeater terminals. The repeater terminals use this feedback information to determine their contribution to the communication path and selectively enter repeating mode or sleep mode, thereby avoiding wasteful power consumption while maintaining diversity gain through coordinated transmission.
Solution Approach 2:
The repeater terminals dynamically adjust their operational state based on real-time communication conditions. By entering repeating mode when contribution is high and sleep mode when contribution is low, the system adapts the transmission behavior of repeater terminals to match actual communication needs, optimizing both power consumption and packet success rate.
2Productivity
If complex routing is implemented to determine communication routes in ad-hoc network, then communication efficiency is improved, but system complexity increases due to network information changes every second
Solution Approach 1:
The patent extracts the routing determination function from complex centralized control and distributes it to individual repeater terminals. Each repeater terminal independently determines its own contribution based on local feedback information, eliminating the need for complex global routing algorithms while maintaining communication efficiency through distributed decision-making.
Solution Approach 2:
The repeater terminals perform self-evaluation of their contribution to the communication path using feedback signals from the destination terminal. This self-service mechanism allows each terminal to autonomously decide whether to participate in packet repetition, replacing complex external routing control with simple local decision-making based on actual communication needs.
3Reliability
If distributed terminals simultaneously transmit packets for ARQ retransmission, then diversity gain is obtained, but power wastage occurs due to terminals transmitting signals in all directions
Solution Approach 1:
The patent applies local quality by having each repeater terminal evaluate its specific contribution to the communication path based on feedback information. Terminals with high contribution enter repeating mode and transmit signals, while terminals with low contribution enter sleep mode and remain silent. This localized differentiation ensures that only necessary terminals transmit, maintaining diversity gain while eliminating power wastage from unnecessary transmissions in all directions.
Data Source
AI summary
This invention provides a communication system, a repeater terminal in the communication system and a communication method for improving the characteristics in a multi-hop communication by a diversity gain and reduces the power consumption by wasteful retransmission in packet transmission at a wireless terminal. When a transmitter terminal S sends a packet first time, repeater terminals R1-R13 perform a data transmission by retransmission at all the terminals which received the packet. When a transmitter terminal S sends a packet second time, a repeater terminal determines its own contribution based on the hop numbers of the repeating in the packet transmission and the return ACK (or NACK) repeating. The repeater terminal with a high contribution autonomously determines to be in “repeater mode” and the repeater terminal with a low contribution autonomously determines to be in “sleep mode”.