Wireless Communication PHY Header Overhead Reduction via MAC Extraction
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Solution Overview
Problem
In wireless communication systems using HARQ, the overhead of the PHY header increases due to the constant storage of scrambling initial values or destination addresses, leading to degraded communication efficiency and processing delays.
Innovation Solution
The proposed solution involves a wireless communication device that distinguishes between first transmission packets and retransmission packets by using a retry field or different modulation methods in the PHY header, allowing for earlier determination of packet type and reduced processing delay, thereby improving communication efficiency and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scrambling initial value or destination address is always stored in the PHY header, then reliability of scrambling processing and decoding efficiency are improved, but the information amount of the PHY header increases and communication efficiency is degraded
Solution Approach 1:
The patent extracts the scrambling initial value from the PHY header and places it in the MAC header instead. This separation allows the PHY header to maintain its original size while still enabling reliable scrambling processing, as the scrambling initial value is made available in the MAC header for the required operations.
Solution Approach 2:
The patent moves the scrambling initial value from the PHY header dimension to the MAC header dimension. This dimensional transition in the packet structure allows the same information to be accessible for scrambling operations while preventing the PHY header overhead from increasing.
2Ease of operation
If scrambling initial value or destination address is always stored in the PHY header, then decoding efficiency is improved, but the information amount of the PHY header increases and communication efficiency is degraded
Solution Approach 1:
The patent extracts the destination address information from the PHY header and stores it in the MAC header instead. This extraction maintains decoding efficiency by preserving access to the destination address while preventing the PHY header size from increasing, thus maintaining communication efficiency.
3Reliability
If the PHY header contains extensive information for HARQ processing, then reliability of HARQ is improved, but processing delay increases
Solution Approach 1:
The patent performs preliminary extraction of the scrambling initial value and destination address from the PHY header and places them in the MAC header before HARQ processing begins. This preliminary action allows the receiver to access necessary information earlier in the processing pipeline, reducing the time required for HARQ operations while maintaining reliability.
Data Source
AI summary
According to one embodiment, an electronic apparatus includes controller circuitry, transmitter circuitry, and receiver circuitry. The controller circuitry is configured to judge whether a payload for a first packet comprises retransmission data; set a first PHY header for the first packet, when the payload does not comprise the retransmission data; set a second PHY header for the first packet, when the payload includes the retransmission data, wherein the second PHY header comprises an amount of information larger than an amount of information of the first PHY header; and generate the first packet comprising the payload and either one of the first PHY header or the second PHY header set for the first packet. The transmitter circuitry is configured to transmit the first packet. The receiver circuitry is configured to receive an ACK signal or a NACK signal for the first packet.