AE-HARQ Receiver Early Decodability Estimation for Latency Reduction
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Solution Overview
Problem
Current communication networks experience delays due to erroneous data transmissions and retransmission requests, particularly in scenarios requiring Ultra-Reliable and Low Latency Communication (URLLC), where conventional HARQ mechanisms result in high latency and low spectral efficiency due to the need for additional round-trip time for retransmissions.
Innovation Solution
The implementation of an aggressive early predictive hybrid automatic repeat request (AE-HARQ) mechanism, which allows for early retransmission requests by splitting data blocks into parts where the first part is used for decodability estimation before the entire block is received, enabling early feedback and reducing retransmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ mechanism is used, then reliability is improved through retransmission, but latency increases due to additional round-trip time
Solution Approach 1:
The patent applies preliminary action by performing decodability estimation on the first part of the code block before the entire data block is received. This allows the receiver to determine whether retransmission is needed in advance, enabling the transmitter to prepare and send retransmission signals without waiting for the complete data block processing, thus reducing latency while maintaining reliability
Solution Approach 2:
The patent segments the code block into multiple parts, with the first part dedicated to decodability estimation and the remaining parts containing the actual data. This segmentation allows the receiver to evaluate the first part independently and make early decisions about retransmission needs, reducing the time required for full decoding while ensuring reliable data transmission
2Loss of time
If early retransmission is implemented, then latency is reduced, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies partial action by performing decodability estimation only on the first part of the code block rather than requiring full decoding of the entire data block. This partial processing approach enables early retransmission decisions without demanding complete processing resources, thus reducing latency while keeping the complexity increase manageable
3Measurement precision
If full data block is transmitted before retransmission decision, then processing accuracy is improved, but spectral efficiency decreases due to unnecessary redundancy
Solution Approach 1:
The patent segments the code block into a first part for decodability estimation and remaining parts for data transmission. This segmentation allows the receiver to accurately assess whether retransmission is needed based on the first part, avoiding unnecessary retransmissions and improving spectral efficiency while maintaining sufficient decoding accuracy through the estimation process
Data Source
AI summary
A receiver is described which receives data from a transmitter. The data is included in a data block which includes at least one code block, and the code block has a plurality of parts. A first part of the code block is used for estimating a decodability of the code block at the receiver. The first part of the code block is arranged in the data block ahead of the remaining one or more parts of the code block. The receiver estimates, prior to receiving the entire data block, the decodability of the code block using the first part of the code block.