Combined Packet Retransmission for Wireless Network Efficiency
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Solution Overview
Problem
Current wireless communication networks face inefficiencies in packet retransmission, particularly with Chase Combining (CC) schemes, which do not allow fine granularity in coding rate adjustments and require separate retransmissions for each incorrectly received packet, leading to transmission inefficiencies and increased memory requirements at receivers.
Innovation Solution
Implementing combined packet retransmission and soft value processing, where receivers form logical combinations of previously transmitted packets to correct bit errors, allowing a single combined packet to correct multiple failed packets as long as bit errors do not overlap, and using weighted combinations of soft values for revised decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Chase Combining (CC) retransmission scheme is used, then memory requirements at receiver are reduced, but coding rate adjustment granularity is limited and retransmission efficiency is reduced
Solution Approach 1:
The patent merges multiple previously transmitted packets into a single combined packet for retransmission. The receiver combines this combined packet with soft values from the original packets to correct errors. This allows one retransmission to address multiple failed packets simultaneously, improving retransmission efficiency while maintaining manageable memory requirements through logical combination rather than separate retransmissions for each packet.
2Reliability
If separate retransmission is performed for each failed packet, then decoding accuracy is improved, but transmission time and resources are increased
Solution Approach 1:
Multiple failed packets are merged into a single combined packet that is retransmitted together. The receiver uses soft combining to process all packets simultaneously, achieving high decoding accuracy for multiple packets in one retransmission cycle rather than requiring separate retransmission cycles for each packet.
Solution Approach 2:
The combined packet serves multiple functions simultaneously - it acts as a retransmission for all constituent packets and enables the receiver to correct errors in multiple packets through a single decoding operation, making the retransmission process multi-functional and time-efficient.
3Productivity
If combined packet retransmission is used, then retransmission efficiency is improved, but complexity of soft value processing increases
Solution Approach 1:
The receiver performs preliminary actions by storing soft values from originally received packets before errors occur. When retransmission is needed, these pre-stored soft values are ready to be combined with the combined packet, avoiding the need for complex real-time processing and reducing the computational burden during the actual retransmission decoding operation.
Data Source
AI summary
In a wireless communication network using point-to-point or point-to-multipoint communications, this disclosure teaches the use of combined packets for retransmission and corresponding soft value processing at a receiver, wherein combined packets are formed as the logical combination of two or more previously transmitted packets and allow the receiver to use a single combined packet to correct one or more failed packets. For example, with the combined packet retransmission and corresponding soft value receiver processing as taught herein, a given receiver can use a given combined packet to correct bit errors in all (failed) packets comprising the combined packet as long as the bit errors in a failed packet do not overlap (or align) with bit errors in the other failed packets comprising the combined packet.