5G Retransmission Using Common 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) that require retransmission, as each device may fail to decode different CBs, resulting in inefficient resource usage and increased feedback information.
Innovation Solution
Implementing an outer code to transmit parity CBs and configuring feedback information to indicate the number and types of CBs transmitted, allowing for reduced retransmissions and resource allocation in wireless communication systems.
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 common parity CBs that can be shared among multiple reception devices. Instead of each device receiving separate retransmissions for their individually failed CBs, the system combines the parity information into common packets that serve multiple devices simultaneously, reducing the total number of retransmission CBs.
Solution Approach 2:
The common parity CBs serve multiple functions by being usable by multiple reception devices for different original CBs. A single parity CB can help multiple reception devices decode their respective failed CBs, making the retransmission resource universal rather than device-specific.
2Reliability
If individual CB retransmissions are performed for each reception device, then the decoding accuracy is improved, but the resource usage efficiency deteriorates
Solution Approach 1:
The patent combines multiple individual retransmission requests into a single common parity CB transmission. Instead of sending separate retransmissions to each reception device for their individually failed CBs, the system merges these into unified common parity packets that are transmitted once and shared by all needing them.
Solution Approach 2:
The common parity CBs act as reusable copies that can be utilized by multiple reception devices. Each reception device can use the same common parity CB copy to help decode their specific failed CB, eliminating the need for multiple unique retransmission copies.
3Measurement precision
If detailed feedback information for each CB is transmitted, then the retransmission accuracy is improved, but the feedback information size increases
Solution Approach 1:
The patent extracts only the essential feedback information (which CBs failed to decode) and omits redundant details. Instead of transmitting comprehensive feedback about every CB status, the system extracts and transmits only the minimal necessary information about failed CBs, reducing feedback size while maintaining sufficient precision for effective retransmission.
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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.