Wireless Packet Retransmission Using Side Information Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless networks, receivers often discard entire packet data when they fail to decode it, leading to wastage of radio resources, as they do not utilize the partial information present in the received data, which can be useful for retransmission strategies.
Innovation Solution
A communication method where receivers generate and feed back side information, such as Log Likelihood Ratio (LLR), mutual information, and bit error probability, to transmitters, allowing them to determine additional redundant bits for retransmission, thereby optimizing resource usage and improving decoding success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the receiver discards all received packet data when decoding fails, then the receiver can maintain simple decoding logic, but radio resources are wasted and useful partial information is lost
Solution Approach 1:
The receiver feeds back side information (such as LLR values, mutual information, or bit error probability) to the transmitter when decoding fails. This feedback enables the transmitter to generate targeted additional redundant bits for retransmission, avoiding the waste of discarding all received data while maintaining relatively simple receiver decoding logic.
Solution Approach 2:
The system changes the parameter of transmitted data by adding different amounts of redundant bits based on the side information feedback. Instead of retransmitting the entire packet, the transmitter adjusts the redundancy level by adding only the necessary additional redundant bits, thereby optimizing radio resource utilization.
2Productivity
If the receiver feeds back detailed side information to the transmitter, then retransmission efficiency is improved, but feedback overhead and system complexity increase
Solution Approach 1:
The receiver extracts only the essential side information parameters (such as average mutual information, bit error probability, or LLR statistics) needed for retransmission optimization, rather than feeding back complete packet data or excessive detail. This extraction approach improves retransmission efficiency while controlling feedback overhead and processing complexity.
3Reliability
If the transmitter retransmits all packet data, then decoding reliability is ensured, but radio resources are wasted
Solution Approach 1:
The transmitter applies partial action by transmitting only the additional redundant bits needed to achieve successful decoding, rather than retransmitting the entire packet data. The amount of retransmission is precisely controlled based on the side information feedback, providing sufficient redundancy for reliability while minimizing radio resource consumption.
4Reliability
If the receiver combines previously received and retransmitted packet data, then decoding success rate improves, but processing complexity increases
Solution Approach 1:
The receiver performs preliminary action by storing the side information (such as LLR values or mutual information measurements) from initially received packet data before retransmission occurs. When additional redundant bits are received, the receiver can efficiently combine this new information with the pre-stored side information, improving decoding success rate while managing processing complexity through advance preparation.
Data Source
AI summary
A receiver that generates side information associated with information that is transmitted with packet data and that is included in received packet data, and that feeds back the side information to the transmitter, is provided. The transmitter may generate and transmit additional redundant bits based on the side information.