Wireless Station Preamble Reuse for Fixed Access Throughput
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Solution Overview
Problem
Existing Wi-Fi standards are inefficient for longer range links in fixed wireless access networks due to overheads in message formats, as they require synchronisation preambles for each message, which are not necessary in fixed systems with stable station positions and known propagation times.
Innovation Solution
Generate synchronisation preambles locally at the wireless station and provide them to the receiver circuit, allowing transmission of payload data without air-borne preambles, using existing Wi-Fi integrated circuits.
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 spectral efficiency deteriorates due to repeated overhead
Solution Approach 1:
The system performs synchronisation once using a preamble in an initial message, then uses the established timing information for subsequent messages. The receiver circuit stores the synchronisation timing obtained from the first message and reuses it for multiple following messages, eliminating the need to repeat the preamble transmission.
Solution Approach 2:
The invention extracts and removes the synchronisation preamble from repeated message transmissions. By separating the synchronisation function (performed once) from the data transmission function (performed repeatedly), the system eliminates redundant preamble overhead while maintaining reliable synchronisation through the initially obtained timing information.
2Ease of manufacture
If message formats follow existing Wi-Fi standards, then commercially available integrated circuits can be used, but data transmission efficiency worsens for longer range links
Solution Approach 1:
The system changes the transmission parameter by omitting the synchronisation preamble from repeated messages. This parameter modification reduces the message overhead from the standard Wi-Fi format, thereby increasing the proportion of payload data in each transmission and improving overall data transmission efficiency for longer range links.
3Reliability
If synchronisation preambles are transmitted with every message, then each message can be independently synchronised, but transmission time increases reducing overall throughput
Solution Approach 1:
The system performs the synchronisation action preliminarily using a preamble in the first message, then stores the obtained timing information. Subsequent messages utilize this pre-established synchronisation without requiring additional preambles, thereby reducing the time consumed per message and increasing overall throughput.
Data Source
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AI summary
A wireless station is operated in a fixed wireless access network, the wireless station comprising a receiver circuit (23) configured to receive messages each having a synchronisation preamble part and a payload data part. A first message (11) is received having at least the synchronisation preamble part (9). A plurality of further messages (13) is received, each further message having been transmitted without the synchronisation preamble part, by generating the synchronisation preamble part (17) based on the received synchronisation preamble part (9) of the first message and providing the receiver circuit (23) with the generated synchronisation preamble part.