Wireless Packet Combination Error Correction for Industrial Reliability
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Solution Overview
Problem
Conventional wireless sensor networks face reliability issues due to packet errors in industrial control systems, where access points may fail to acknowledge data packets with errors, leading to potential loss of critical process variable data if retransmissions fail.
Innovation Solution
The method involves receiving multiple copies of a data packet with errors, identifying bit positions where they differ, modifying these positions to produce an error-free copy by combining portions of the packets, and determining if the modified packet is error-free, thereby ensuring reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acknowledgement-based error handling is used, then transmission reliability is maintained through retransmissions, but data loss occurs when retransmissions fail
Solution Approach 1:
The patent combines multiple erroneous packet copies to reconstruct an error-free packet. The controller receives multiple copies of the same data packet transmitted at different times, identifies error patterns across copies, and synthesizes a corrected version by selecting correct bits from different copies, thereby preventing data loss without requiring successful retransmissions.
Solution Approach 2:
The system performs error correction in advance by preparing multiple packet copies before any single copy can be confirmed as error-free. By maintaining a buffer of multiple copies and proactively attempting combination-based correction, the system prevents data loss before it occurs rather than reacting after retransmission failures.
2Reliability
If multiple packet copies are received and combined, then error-free data reconstruction is achieved, but system complexity increases
Solution Approach 1:
The patent segments the packet correction problem into manageable steps: receiving multiple copies, comparing bit positions across copies, identifying error patterns, and reconstructing the correct packet. This systematic segmentation of the correction process makes the complex task of error-free reconstruction achievable through structured algorithmic steps rather than monolithic processing.
Data Source
AI summary
Various techniques are disclosed for improved reliability of wireless communications using packet combination-based error correction. For example, a method includes receiving a first message transmitted wirelessly, where the first message contains a first copy of a data packet and has at least one error. The method also includes receiving a second message transmitted wirelessly, where the second message contains a second copy of the data packet and has at least one error. The method further includes identifying a set of bit positions based on where the first and second copies of the data packet differ and modifying the set of bit positions to produce a modified set of bit positions. In addition, the method includes modifying one or more bit values in the modified set of bit positions to produce at least one modified copy of the data packet and determining if the at least one modified copy of the data packet is error-free.