Forwarding Stations for Energy Balancing in IEEE 802.11ah Networks
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Solution Overview
Problem
In IEEE 802.11ah wireless networks, remote stations consume more energy and drain their batteries faster than inner stations due to higher transmission rates and signal attenuation, leading to an energy consumption imbalance that can result in network service degradation as remote stations deplete their batteries sooner than inner stations.
Innovation Solution
Implementing a system and method where forwarding stations (F-STAs) with less stringent power constraints assist in forwarding messages from power-constrained stations (NF-STAs) to the access point, reducing the energy expenditure of NF-STAs by allowing them to conserve energy and alleviate the power consumption imbalance by aggregating data and improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If remote stations transmit directly to access point, then message delivery is achieved, but energy consumption increases significantly
Solution Approach 1:
The patent introduces forwarding stations as intermediary nodes between remote stations and access points. Remote stations transmit messages to nearby forwarding stations, which then relay the messages to the access point. This two-hop transmission path reduces the energy consumption of remote stations by avoiding direct long-distance transmission to the access point, while still ensuring reliable message delivery through the intermediary forwarding stations.
2Reliability
If all stations transmit at full power, then transmission reliability is improved, but battery life of remote stations decreases
Solution Approach 1:
Forwarding stations act as intermediaries that receive transmissions from remote stations at lower power levels and then forward them to access points. This allows remote stations to maintain transmission reliability by using intermediate nodes rather than transmitting directly at full power over long distances, thereby extending their battery life.
Solution Approach 2:
The system enables stations to self-select their transmission mode based on their power status and location. Remote stations with sufficient battery life can transmit directly to access points, while those with constrained power can utilize forwarding stations, allowing each station to optimize its own energy consumption while maintaining network functionality.
3Use of energy by moving object
If forwarding stations are introduced, then energy consumption of remote stations is reduced, but device complexity increases
Solution Approach 1:
The patent designs forwarding stations with multi-functionality, allowing them to operate both as regular stations transmitting their own data and as forwarding nodes relaying data from other stations. This universal design reduces the need for dedicated infrastructure and minimizes network complexity by utilizing existing station capabilities for both data transmission and forwarding functions.
Data Source
AI summary
A method for operating a first station includes broadcasting identifying information during a contention period after obtaining access to a communications medium used to transmit messages. The method also includes receiving a transmission intended for an access point from a second station over the communications medium, and forwarding the transmission to the access point over the communications medium.