Relay Selection Using Initial Receive Signal Strength
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Solution Overview
Problem
Existing wireless LAN protocols, such as IEEE 802.11, face inefficiencies in relay station selection due to excessive overhead from maintaining transmit tables and frequent notifications, and do not effectively account for varying power settings among mobile stations, leading to suboptimal channel quality assessments.
Innovation Solution
A method where relay stations measure and report received signal strength, with more favorable reports being transmitted expeditiously to select the best relay station, using a mapping table to correlate signal strength with transmission rates and adaptively adjusting these correlations based on observed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If relay stations transmit reports expeditiously based on signal strength, then relay station selection accuracy is improved, but transmission timing coordination complexity increases
Solution Approach 1:
The patent applies preliminary action by having relay stations pre-calculate their backoff times based on their channel quality measurements before transmission. Each relay station determines its report transmission timing in advance based on predicted signal strength, allowing the system to prioritize high-quality relays without requiring complex real-time coordination during the actual transmission phase.
2Loss of time
If all relay stations transmit reports simultaneously, then transmission time is reduced, but contention and collisions increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmission timing parameter (backoff time) of each relay station based on its channel quality. Instead of using a fixed or random backoff time for all stations, the system modifies this parameter individually for each relay station, creating a distributed timing scheme that reduces collisions while maintaining efficiency. High-quality relays use shorter backoff times, ensuring their reports are transmitted earlier with higher probability.
Data Source
AI summary
A light-weight relay selection mechanism selects the most likely “best” relay station for data transmission from a given source station S to an access point AP using the Initial Receive Signal Strength (IRSS) to infer the future data transmission rate. In the initialization stage, the access point AP constructs a table mapping the IRSSs of receivers to eight levels of transmission rate. In the relay selection stage, relay candidates R measure the IRSSs for the source station S and access point AP and report their IRSS levels to the AP. A contention-based mechanism is dedicated to enabling the candidate with higher IRSS levels to report earlier. With this mechanism, the access point AP is able to select the station with the highest estimated data transmission rate.