Packet Switched Communication Error Correction Throughput
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Solution Overview
Problem
In packet-switched wireless communication systems, the effective data rate is restricted because new data transmission is halted until previous packets are successfully decoded, leading to reduced throughput due to the need for retransmissions and incremental redundancy, which limits data transfer efficiency.
Innovation Solution
The system allows for the transmission of new data packets alongside redundancy bits for previous packets, even if they have not been successfully decoded, using error correction algorithms like RCPC, turbo codes, or LDPC, enabling continuous data transfer by incorporating additional redundancy bits as needed to ensure reliable decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new data transmission is halted until previous packets are successfully decoded, then decoding reliability is improved, but data throughput deteriorates
Solution Approach 1:
The transmitter performs preliminary encoding of new data packets and prepares them for transmission in advance, before previous packets are fully decoded. This allows the transmission pipeline to remain full and continuous, improving throughput while maintaining decoding reliability through the preliminary preparation of error correction codes.
Solution Approach 2:
The system maintains continuous data transmission by allowing new packets to be transmitted without interruption, even while previous packets are being decoded. The useful action of data transmission continues uninterrupted, while error correction processes run in parallel, thus improving throughput without sacrificing reliability.
2Reliability
If redundant error correction bits are added to each packet, then error correction capability is improved, but data rate deteriorates
Solution Approach 1:
The system applies error correction codes at a rate that provides sufficient protection without excessive redundancy. By carefully selecting the balance between data bits and error correction bits, the system achieves adequate error correction capability while minimizing the impact on data rate, avoiding the penalty of excessive redundancy.
Solution Approach 2:
The system dynamically adjusts the error correction parameters and code rates based on channel conditions and packet importance. By changing these parameters optimally, the system achieves reliable error correction while maintaining higher effective data rates compared to fixed redundant schemes.
3Reliability
If incremental redundancy is used with retransmission requests, then decoding reliability is improved, but transmission efficiency deteriorates
Solution Approach 1:
The transmitter prepares and queues multiple versions of error correction codes in advance for each data packet. When a packet requires retransmission, the receiver can immediately utilize these pre-prepared redundant versions without waiting for additional transmission cycles, thus improving decoding reliability while maintaining transmission efficiency.
Solution Approach 2:
The system creates multiple copies of the same data packet with different error correction code versions. These copies are transmitted incrementally until successful decoding, eliminating the need for complex retransmission protocols and improving overall transmission efficiency while maintaining high decoding reliability.
Data Source
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Figure 3
AI summary
The invention relates to a method for use in a packet-switched communication system, the method comprising: sending a first packet from a source node to a destination node, the first packet containing a first set of data bits; sending a second packet from the source node to the destination node, the second packet containing a second set of data bits; wherein, in the event that the first set of data bits cannot be successfully decoded in the destination node, the second packet further comprises a first set of error correction bits for the first set of data bits.