HARQ Feedback Identifier Timing for Early Failure Reporting
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Solution Overview
Problem
In wireless communication systems, there is a significant delay in detecting and reporting the unsuccessful termination of Hybrid Automatic Repeat Request (HARQ) processes, leading to increased ARQ latency and signaling overhead due to the uncertainty in scheduling of intervening transport blocks.
Innovation Solution
A user equipment (UE) initiates a timer associated with a HARQ process identifier and transmits an indication of an event upon timer expiration, allowing early detection and reporting of potentially unsuccessful HARQ terminations based on successful decoding of transport blocks and NDI value discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system waits for feedback communication before detecting HARQ process termination, then detection accuracy is improved, but ARQ latency increases
Solution Approach 1:
The system initiates a timer immediately upon receiving the downlink communication, performing the detection preparation action in advance. When the timer expires without receiving feedback, the system proactively declares HARQ process termination without waiting for the feedback communication, thus reducing latency while maintaining detection accuracy through the timer-based early detection mechanism.
2Reliability
If the system monitors all HARQ processes until feedback is received, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The system extracts and monitors only the specific HARQ process identifier associated with the received downlink communication. By using a timer targeted at a specific HARQ process rather than monitoring all processes, the system reduces signaling overhead while maintaining reliability for the monitored process. The timer expiration triggers selective termination declaration only for the relevant HARQ process.
3Reliability
If the system maintains buffering for all HARQ processes, then data integrity is improved, but resource usage increases
Solution Approach 1:
The system performs preliminary timer-based monitoring for each HARQ process and proactively releases buffering resources when the timer expires without feedback, indicating unsuccessful termination. This preliminary detection mechanism allows the system to maintain data integrity during the monitoring period while efficiently releasing resources afterward, optimizing the balance between reliability and resource usage.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a downlink communication associated with a hybrid automatic repeat request (HARQ) process identifier. The UE may initiate a timer associated with the HARQ process identifier in accordance with the downlink communication or in accordance with a feedback communication associated with the downlink communication. The UE may transmit an indication of an event associated with the HARQ process identifier in association with an expiration of the timer. Numerous other aspects are described.