Selective Packet Retransmission With Embedded Error Correction Bits
Find Innovative SolutionsGenerate Solutions
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 method involves sending error correction bits with subsequent data packets when previous packets cannot be successfully decoded, allowing continuous data transmission and incremental error correction, using a combination of error detection and correction algorithms like CRC and RCPC, enabling reliable decoding and increased throughput.
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 transfer efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by including error correction bits for previous packets in advance within subsequent data packets. Instead of waiting for previous packets to be successfully decoded, the system proactively embeds correction information in upcoming transmissions, allowing continuous data flow while maintaining the ability to correct errors later.
Solution Approach 2:
The patent uses an intermediary approach by introducing error correction bits as a mediating element between transmitted data and successful decoding. These correction bits act as a buffer that enables the receiver to handle decoding failures without interrupting the overall data transmission stream.
2Reliability
If redundant error correction bits are sent with each retransmission, then decoding reliability is improved, but effective data rate deteriorates
Solution Approach 1:
The patent merges two functions into a single transmission: delivering new data packets and providing error correction bits for previous packets simultaneously. By combining these functions, the system avoids the overhead of separate retransmission requests and reduces the total number of transmissions needed, thereby improving effective data rate while maintaining reliability.
Solution Approach 2:
Each transmitted packet serves multiple functions: it carries new data information and simultaneously provides error correction capability for previously transmitted packets. This multi-functionality reduces the need for dedicated retransmission packets, improving overall system efficiency.
3Device complexity
If packets initiating retransmission requests are discarded, then device complexity is reduced, but information loss increases
Solution Approach 1:
The patent applies preliminary action by including error correction bits in advance within subsequent transmissions. This proactive approach eliminates the need for complex retransmission request handling and packet storage mechanisms, reducing receiver complexity while preventing information loss through continuous transmission.
Data Source
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.