Raptor Code Packet Signaling for Low-Overhead Soft Combining
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Solution Overview
Problem
In wireless communication systems, the inclusion of source block numbers (SBN) and encoding symbol identifiers (ESI) in packet headers for raptor codes leads to increased overhead and can prevent soft-combining if the header is not received correctly, resulting in higher latency due to increased retransmissions.
Innovation Solution
Communicating SBN and ESI indications separately from the packets via control signaling, allowing decoding devices to generate these identifiers based on scheduling information, thereby reducing overhead and enabling soft-combining even if the header is not correctly received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SBN and ESI are included in packet headers for raptor codes, then decoding accuracy is improved, but overhead increases and latency increases due to retransmissions
Solution Approach 1:
The patent segments the header information by separating SBN and ESI indications from the data packets and transmitting them through separate control signaling. This allows the decoding device to obtain necessary decoding information without relying on packet headers, thereby reducing overhead and enabling soft-combining operations even when headers are not correctly received, ultimately reducing latency while maintaining decoding accuracy
Solution Approach 2:
The patent introduces control signaling as an intermediary channel to transmit SBN and ESI information separately from the data packets. This intermediary mechanism ensures that decoding information is reliably delivered through a dedicated control channel, independent of the data channel, thus preventing header reception failures from causing retransmissions and reducing latency
2Loss of information
If SBN and ESI are included in packet headers, then decoding information is provided, but overhead increases
Solution Approach 1:
The patent extracts SBN and ESI information from the packet headers and transmits them separately through control signaling. This extraction removes the overhead burden from data packets while ensuring decoding information is still provided through the control channel, thus reducing overhead without compromising decoding information completeness
Solution Approach 2:
The patent segments the transmission of decoding information by separating SBN and ESI indications from data packets and transmitting them through distinct control signaling mechanisms. This segmentation reduces the overhead in data packets while maintaining complete decoding information availability through the control channel
3Reliability
If headers are not received correctly, then packet transmission fails, but soft-combining cannot be performed resulting in increased retransmissions
Solution Approach 1:
The patent prepares decoding information (SBN and ESI) through separate control signaling in advance, independent of the data packet transmission. This prior cushioning ensures that even if packet headers are not correctly received, the decoding device already has the necessary information to perform soft-combining operations, thereby preventing retransmissions and maintaining transmission efficiency
Solution Approach 2:
The patent uses control signaling as an intermediary to deliver decoding information separately from data packets. This intermediary approach ensures that header reception failures do not prevent soft-combining operations, as the control channel independently delivers the necessary SBN and ESI information, thus maintaining both reliability and productivity
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An encoding device (e.g., a base station or user equipment (UE)) may communicate, with a decoding device (e.g., a UE or base station), an indication of a set of encoding symbol identifiers via a control channel. The encoding device may transmit a set of packets associated with a rateless code via a data channel, where each of the set of packets includes an encoding symbol. The decoding device may decode the set of encoding symbols based on the set of encoding symbol identifiers.