Wireless LAN Device MPDU Duplication for Reliable Transmission
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Solution Overview
Problem
Current wireless LAN systems cannot perform redundant transmission with a single wireless LAN chip configuration, leading to delays, jitter, and packet loss due to radio interference.
Innovation Solution
A wireless LAN communication device and method that generates an A-MPDU by duplicating transmission data and arranging redundant and duplicate MPDUs at distant positions, controlling re-transmissions based on successful reception notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple wireless LAN chips are used for redundant transmission, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a virtual copy of the transmission path by duplicating MPDUs within the same wireless LAN chip. Instead of using multiple physical chips, the system generates redundant MPDU copies and transmits them through the same physical interface, achieving reliability improvement without increasing hardware complexity
Solution Approach 2:
The wireless LAN chip performs multiple functions: it acts as both the primary transmitter and the redundant transmitter through virtual path duplication. The same physical chip handles both original and duplicate MPDU transmissions, making the system more versatile without adding components
2Reliability
If re-transmission is performed upon transmission error, then data delivery reliability is improved, but transmission delay increases
Solution Approach 1:
The system performs preliminary action by transmitting duplicate MPDUs in advance before the original transmission is confirmed successful. The receiver acknowledges receipt of either the original or duplicate MPDU, and the transmitter stops re-transmission upon receiving acknowledgment, thereby reducing unnecessary delays
Solution Approach 2:
The receiver provides feedback by sending an ACK frame when either the original or duplicate MPDU is successfully received. This feedback mechanism allows the transmitter to stop re-transmission promptly, reducing transmission delay while maintaining reliability
3Reliability
If redundant transmission is implemented, then packet loss is reduced, but transmission overhead increases
Solution Approach 1:
The system applies partial redundancy by transmitting duplicate MPDUs only for certain data packets rather than all packets. This selective redundancy approach reduces the overall transmission overhead while still providing packet loss protection for critical data
Solution Approach 2:
The patent merges the original MPDU and duplicate MPDU into a single A-MPDU aggregate for transmission. By combining multiple MPDUs (including duplicates) into one aggregated frame, the system reduces the number of separate transmission frames needed, thereby lowering transmission overhead
Data Source
AI summary
A wireless LAN communication device generates an MPDU by attaching a MAC header to transmission data, generates an A-MPDU subframe by attaching an MPDU delimiter to the MPDU, generates an A-MPDU by aggregating a plurality of A-MPDU subframes, and transmits the A-MPDU. The wireless LAN communication device includes: an MPDU duplicating means for determining whether or not transmission data is a redundancy target according to a required quality of the transmission data, determining that an MPDU generated from the transmission data determined to be a redundancy target is a redundant MPDU, and generating a duplicate MPDU by duplicating the redundant MPDU; and an A-MPDU generating means for generating an A-MPDU that includes the redundant MPDU and the duplicate MPDU.