Hybrid Codeblock Group Signaling for 5G Retransmission Overhead
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Solution Overview
Problem
In 5G wireless communication systems, the existing methods for signaling retransmitted codeblock groups are inefficient, leading to high network overhead and bandwidth consumption, especially when the number of codeblock groups exceeds a certain threshold, as they require explicit signaling which consumes significant resources.
Innovation Solution
A hybrid system is implemented that uses a codeblock group confirmation bit in the control information to implicitly signal retransmitted codeblock groups when the number exceeds a predetermined threshold, reducing the need for explicit bit mapping and thereby minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit signaling is used to indicate retransmitted codeblock groups, then the receiver can accurately identify which codeblock groups are being retransmitted, but the network overhead and bandwidth consumption increase significantly
Solution Approach 1:
The patent changes the signaling parameter from explicit bit mapping to a confirmation bit approach. When the number of codeblock groups exceeds a threshold, the system switches to using a single confirmation bit that implicitly indicates retransmission status, thereby reducing signaling overhead while maintaining sufficient identification accuracy
Solution Approach 2:
The patent implements a dynamic signaling mechanism that adapts the signaling method based on the number of codeblock groups. The system dynamically switches between explicit signaling (for small numbers) and implicit confirmation bit signaling (for large numbers), optimizing the balance between identification accuracy and resource consumption
2Loss of information
If explicit bit mapping is used for all codeblock groups, then complete retransmission information is provided, but the processing resources and signaling complexity increase
Solution Approach 1:
The patent extracts only the essential retransmission confirmation information when the number of codeblock groups is large, rather than transmitting complete bit mapping for all groups. The confirmation bit extracts the critical acknowledgment that retransmission is occurring, eliminating the need for complex detailed signaling
Solution Approach 2:
The patent applies partial action by using confirmation bits instead of complete bit mapping for large numbers of codeblock groups. This partial signaling approach provides sufficient information for the receiver to identify retransmitted groups without the excessive complexity of full explicit signaling
Data Source
AI summary
Various embodiments disclosed herein provide for a retransmission system that uses a hybrid system to signal to a receiver the retransmission of codeblock groups to reduce network overhead and bandwidth. The amount of bandwidth needed to signal to a receiver which codeblock groups are being retransmitted is directly proportional to the number of codeblock groups. Therefore, during retransmission, if the number of a codeblock groups is below a predetermined threshold, then explicit signaling can be performed, where the transmitter sends a bit map identifying the codeblock groups being retransmitted. If the number of codeblock groups is above the threshold however, can use a codeblock group confirmation bit in the control information sent to the receiver, where the values of the bit can inform the receiver how the retransmission will be performed.