5G Retransmission Using Outer-Code Parity Code Blocks
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Solution Overview
Problem
In 5G wireless communication systems, the increased number of reception devices leads to a higher number of code blocks (CBs) requiring retransmission, as each device may fail to decode different CBs, resulting in inefficient resource usage and increased feedback information.
Innovation Solution
A method and apparatus that utilize an outer code to determine and transmit parity CBs based on the number of CBs that fail to decode, reducing the number of CBs needing retransmission and optimizing resource allocation by configuring feedback information to indicate the number of failed CBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transmission device transmits data to multiple reception devices, then the coverage and service capability are improved, but the number of CBs requiring retransmission increases
Solution Approach 1:
The patent merges the retransmission resources by transmitting a single set of parity CBs that can serve multiple reception devices simultaneously. Instead of each reception device requiring separate retransmission resources for their individually failed CBs, the system combines these needs and transmits unified parity CBs that can be used by any reception device that needs them, thereby reducing the total quantity of retransmission data.
Solution Approach 2:
The transmitted parity CBs serve multiple functions and multiple reception devices simultaneously. A single set of parity CBs transmitted by the transmission device can be utilized by multiple different reception devices that each have different decoding failures, making the retransmission resource universal and multi-functional rather than dedicated to a single device.
2Measurement precision
If detailed feedback information for each CB is transmitted, then the decoding accuracy is improved, but the feedback information size increases
Solution Approach 1:
The patent extracts only the essential feedback information needed for efficient retransmission - specifically, the count of failed CBs - rather than transmitting complete detailed information about each individual failed CB. This extracted minimal feedback (just the number of failures) is sufficient for the transmission device to determine the appropriate number of parity CBs to transmit, achieving good decoding accuracy support while minimizing feedback size.
Solution Approach 2:
The patent changes the feedback parameter from detailed per-CB status information to a simplified aggregate parameter (the count of failed CBs). This parameter transformation maintains the essential information needed for retransmission decision-making while dramatically reducing the feedback information size, as the count requires far fewer bits than individual CB status reports.
Data Source
AI summary
Disclosed is a 5th generation (5G) or a pre-5G communication system for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long term evolution (LTE). An apparatus and a method for performing retransmission in a wireless communication system are provided. A method for operating a transmitting device in a wireless communication system, according to various embodiments of the present disclosure, comprises the steps of: transmitting a plurality of data code blocks (CBs) to at least one receiving device in an initial transmission step; receiving, from the at least one receiving device, feedback information including information for indicating the number of data CBs, from among the plurality of data CBs, for which decoding has failed; and transmitting the number of parity CBs, determined on the basis of the number of data CBs for which the decoding has failed, to the at least one receiving device in a retransmission step. Therefore, the resources required for retransmission can be reduced.