Multi-Layer Packet Coding for Flexible HARQ and Error Protection
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Solution Overview
Problem
Current packet coding schemes in wireless communication systems lack effective error-detection capability, especially for large data segments, and have limited flexibility in hybrid automatic repeat request (HARQ) operations, which hampers their ability to meet stringent performance requirements such as low latency and high reliability in future 5G applications.
Innovation Solution
The implementation of multi-layer packet coding (MLPC) that involves segmenting data into multiple segments, encoding each into forward error correction (FEC) codewords, performing XOR operations to generate parity codewords, and transmitting these codewords to enhance error protection and reduce latency, while allowing for flexible HARQ operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional packet coding schemes are used, then device complexity is reduced, but error detection capability and reliability deteriorate for large data segments
Solution Approach 1:
The data stream is segmented into multiple data segments, each encoded into separate FEC codewords. Multiple layers of parity codewords are generated through XOR operations on different combinations of data codewords. This segmentation allows the system to detect and correct errors in large data transmissions by dividing them into manageable units with dedicated error protection, resolving the contradiction between maintaining low complexity and improving reliability.
Solution Approach 2:
The patent introduces a multi-layer parity structure where parity codewords are organized in multiple layers (first layer, second layer, etc.). Each layer provides different levels of error protection by XORing different combinations of data codewords. This dimensional expansion from single-layer to multi-layer parity coding enhances error detection capability without linearly increasing overall system complexity.
2Loss of time
If traditional packet coding schemes are used, then device complexity is reduced, but transmission latency increases due to limited HARQ flexibility
Solution Approach 1:
The patent implements dynamic HARQ operations where the receiver can selectively request retransmission of specific failed codewords or entire sections based on which parity layers were successfully decoded. This dynamic approach allows flexible adaptation to channel conditions and error patterns, reducing unnecessary retransmissions and latency while managing HARQ complexity through intelligent selection of retransmission targets.
Solution Approach 2:
The system employs feedback mechanisms where the receiver sends acknowledgments indicating which sections or codewords failed to decode successfully. This feedback enables the transmitter to perform targeted retransmissions of only the necessary codewords or sections, rather than retransmitting entire data blocks, thereby reducing transmission latency and improving overall system efficiency.
3Reliability
If multi-layer packet coding is implemented, then error detection capability and reliability are improved, but device complexity increases
Solution Approach 1:
The data stream is segmented into multiple data segments, each encoded into separate FEC codewords. Multiple layers of parity codewords are generated through XOR operations on different combinations of data codewords. This segmentation allows the system to detect and correct errors in large data transmissions by dividing them into manageable units with dedicated error protection, resolving the contradiction between maintaining low complexity and improving reliability.
Solution Approach 2:
The patent introduces a multi-layer parity structure where parity codewords are organized in multiple layers (first layer, second layer, etc.). Each layer provides different levels of error protection by XORing different combinations of data codewords. This dimensional expansion from single-layer to multi-layer parity coding enhances error detection capability without linearly increasing overall system complexity.
4Loss of time
If multi-layer packet coding is implemented, then transmission latency is reduced through flexible HARQ, but device complexity increases
Solution Approach 1:
The patent implements dynamic HARQ operations where the receiver can selectively request retransmission of specific failed codewords or entire sections based on which parity layers were successfully decoded. This dynamic approach allows flexible adaptation to channel conditions and error patterns, reducing unnecessary retransmissions and latency while managing HARQ complexity through intelligent selection of retransmission targets.
Solution Approach 2:
The system employs feedback mechanisms where the receiver sends acknowledgments indicating which sections or codewords failed to decode successfully. This feedback enables the transmitter to perform targeted retransmissions of only the necessary codewords or sections, rather than retransmitting entire data blocks, thereby reducing transmission latency and improving overall system efficiency.
Data Source
AI summary
Communication devices, systems and methods for performing multi-layer packet coding (MLPC) in a wireless system are provided. The MLPC includes segmenting a data stream into a plurality of data segments, encoding each of the plurality of data segments into a plurality of forward error correction (FEC) codewords, performing a first exclusive OR (XOR) operation on the plurality of FEC codewords to generate a plurality of first layer parity codewords, performing a second XOR operation on the plurality of first layer parity codewords to generate at least one second layer parity codeword, and transmitting at least one of: the plurality of FEC codewords, the plurality of first layer parity codewords, or the at least one second layer parity codeword.