Network-Coded MU-PPDU Recovery for Reliable Wi-Fi Transmission
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Solution Overview
Problem
WLANs and Wi-Fi networks operating in unlicensed spectrum face interference issues leading to packet losses, necessitating multiple retransmissions and duplicate transmissions, which degrade spectral efficiency and require higher reliability.
Innovation Solution
Implementing network coding for multi-user physical layer protocol data units (MU-PPDUs) to enhance reliability by generating a parity portion based on data portions addressed to multiple stations, allowing stations to recover corrupted data using both the parity and other data portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmissions or duplicate transmissions are used to provide high reliability, then packet reception reliability is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent combines multiple users' data packets into a single network-coded packet that can be decoded by any user who receives it. Instead of transmitting separate duplicate packets to each user, the system merges the data into a unified encoded stream where each user can recover their original data from the combined transmission, thereby improving spectral efficiency while maintaining reliability
Solution Approach 2:
The network-coded packet serves multiple functions simultaneously: it acts as a data packet for user 1, a data packet for user 2, and provides error correction capabilities for both users. This multi-functionality allows a single transmission to serve multiple reliability needs without requiring separate retransmission streams for each user
2Loss of energy
If network coding with parity portion is used, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the data transmission into distinct portions: original data packets from each user and generated parity packets. This segmentation allows the system to manage complexity by processing and transmitting data in organized chunks rather than requiring complex end-to-end encoding, making the network coding implementation more tractable
Data Source
AI summary
A non-access point (AP) station (STA) may be configured for receipt of a multi-user physical layer protocol data unit (MU-PPDU) with network coding. The STA may decode at least portions of a MU-PPDU received from an access point (AP). The MU-PPDU may comprise a first data portion addressed to the STA, a second data portion addressed to a second STA2, and a parity portion addressed to both the stations. The parity portion may be generated by the AP based on a network coding of the first and second data portions. When the first data portion is received by the STA with errors, the STA may attempt to recover the first data portion using both the parity portion and the second data portion.