HARQ Data Block Sizing for Soft Buffer Memory Limits
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Solution Overview
Problem
Current wireless communication systems using Hybrid Automatic Repeat Request (HARQ) protocols face inefficiencies due to the need for a fixed number of HARQ processes, which can lead to unnecessary delays and increased buffer memory requirements, especially when the number of processes exceeds the necessary roundtrip time, and the two-stage rate matching scheme is cumbersome and shifts costs from user equipment to the system.
Innovation Solution
A method to dynamically adjust the maximum data block size based on the number of active HARQ processes and available soft buffer memory, allowing for a configurable number of HARQ processes and reducing data block size when buffer memory is insufficient, ensuring continuous transmission and minimizing buffer requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed number of HARQ processes is used, then system simplicity is maintained, but transmission efficiency deteriorates due to unnecessary delays and increased buffer memory requirements
Solution Approach 1:
The patent implements dynamic adjustment of the number of HARQ processes based on propagation delay conditions. The system transitions from a fixed configuration to a dynamic one where the number of processes adapts to channel conditions, thereby improving transmission efficiency without permanently increasing system complexity
Solution Approach 2:
The invention changes the parameter of HARQ process count based on propagation delay measurements. By adjusting this key parameter dynamically, the system optimizes transmission efficiency for different channel conditions while managing buffer memory requirements effectively
2Productivity
If the number of HARQ processes is increased to handle varying propagation delays, then transmission continuity is improved, but buffer memory requirements increase
Solution Approach 1:
The patent dynamically adjusts the number of HARQ processes based on propagation delay conditions, which directly controls the buffer memory requirements. By changing this parameter adaptively rather than using a fixed high number, the system maintains transmission continuity while optimizing buffer usage
Solution Approach 2:
The system implements dynamic control of HARQ process count to match actual channel conditions. This dynamic approach ensures transmission continuity when needed (high propagation delay) while reducing buffer memory consumption when conditions improve
3Quantity of substance
If data block size is reduced, then buffer memory requirements are minimized, but transmission throughput may deteriorate
Solution Approach 1:
The patent adjusts data block size as a controllable parameter based on the number of active HARQ processes and buffer availability. By dynamically changing this parameter, the system minimizes buffer requirements while maintaining acceptable throughput through optimized block sizing rather than fixed small blocks
Data Source
AI summary
A first transceiver that supports hybrid Automatic Repeat Request (hybrid ARQ) functionality is operated. Initially, it is operated to transmit data blocks having a nominal maximum data block size, M0. In response to detecting that a second transceiver does not have sufficient soft buffer memory space to store data blocks associated with an anticipated number of active hybrid ARQ processes, the transceiver is operated to transmit data blocks having a reduced data block size, M′. The anticipated number of active hybrid ARQ processes can be, for example, higher than a nominal number of active hybrid ARQ processes.