Wireless Station Preamble Copying for Fixed Access Throughput
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Solution Overview
Problem
Existing Wi-Fi standards are inefficient for long-range data transmission in fixed wireless access networks due to overheads in message formats, as they require synchronisation preambles for each message, which are not necessary in systems with fixed station positions and known propagation times.
Innovation Solution
Generate synchronisation preambles locally at the wireless station and provide them to the receiver circuit without transmitting over the air, using the synchronisation timing established by the first message for subsequent messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronisation preambles are transmitted with each message according to Wi-Fi standards, then receiver circuits can achieve proper synchronisation, but transmission efficiency deteriorates due to repeated overheads
Solution Approach 1:
The system performs synchronisation once using a first message with a synchronisation preamble, then generates and provides synchronisation preambles locally for subsequent messages without re-transmitting them over the air. This preliminary synchronisation action eliminates repeated transmission overheads while maintaining receiver synchronisation capability.
Solution Approach 2:
The receiver circuit generates copies of the synchronisation preamble locally based on the initial synchronisation from the first message. These locally generated preambles are provided to the receiver circuit for subsequent messages, replacing the need to receive actual preamble transmissions for each message.
2Ease of manufacture
If message formats follow existing Wi-Fi standards, then commercially available integrated circuits can be used, but transmission overheads increase for long-range links
Solution Approach 1:
The system dynamically adapts the message format by transmitting only payload data in subsequent messages after initial synchronisation, rather than following the static Wi-Fi format that requires preambles with every message. This dynamic approach maintains compatibility with commercial Wi-Fi circuits while improving spectral efficiency.
Solution Approach 2:
The system changes the transmission parameter by omitting the synchronisation preamble from subsequent messages after initial establishment. This parameter change reduces message overhead and improves spectral efficiency while the locally generated preambles maintain receiver functionality.
3Reliability
If synchronisation preambles are transmitted with every message, then each message can be independently synchronised, but more time is consumed in transmission
Solution Approach 1:
Synchronisation is performed preliminarily using the first message with its synchronisation preamble. Subsequent messages then use locally generated preambles, eliminating the need for repeated preamble transmissions and reducing total transmission time while maintaining synchronisation reliability.
Data Source
AI summary
A wireless station is operated in a fixed wireless access network, the wireless station comprising a receiver circuit configured to receive messages each having a synchronisation preamble part and a payload data part. A first message is received having at least the synchronisation preamble part. A plurality of further messages is received, each further message having been transmitted without the synchronisation preamble part, by generating the synchronisation preamble part based on the received synchronisation preamble part of the first message and providing the receiver circuit with the generated synchronisation preamble part.