PDCCH HARQ Feedback for Dynamic Control Channel Tuning
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing control channel performance due to inefficiencies in hybrid automatic repeat request (HARQ) processes, particularly when HARQ-based retransmissions are disabled for dynamically scheduled physical downlink shared channel (PDSCH) transmissions.
Innovation Solution
Implementing HARQ feedback mechanisms that indicate decoding results for PDCCH transmissions based on disabled HARQ processes, allowing for adjustments to PDCCH configurations to enhance control channel performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HARQ-based retransmission is disabled for dynamically scheduled PDSCH transmissions, then system complexity is reduced and latency is lowered, but control channel performance deteriorates due to lack of feedback for optimization
Solution Approach 1:
The patent introduces a feedback mechanism where the UE sends HARQ feedback indicating PDCCH decoding results (ACK/NACK) to the network node, even when HARQ-based retransmission is disabled. This feedback enables the network node to adjust PDCCH configuration parameters such as aggregation level, frequency hopping, and cyclic shift to improve control channel performance without enabling full HARQ retransmission processes.
2Reliability
If HARQ feedback mechanisms are implemented to indicate decoding results, then control channel performance is improved through dynamic adjustments, but system complexity increases
Solution Approach 1:
The patent extracts only the essential feedback function from the complete HARQ process. Instead of implementing full HARQ with retransmission, the system implements a simplified feedback mechanism that only transmits ACK/NACK indicators for PDCCH decoding results, removing the complex retransmission control logic while retaining the performance optimization benefits of feedback.
Solution Approach 2:
The patent uses HARQ feedback to trigger parameter changes in PDCCH configuration. The network node adjusts parameters such as aggregation level, frequency hopping enablement, and cyclic shift values based on the received ACK/NACK feedback, optimizing control channel performance through dynamic parameter adaptation without adding complex protocol mechanisms.
3Productivity
If PDCCH configuration is adjusted based on HARQ feedback, then resource allocation efficiency is optimized, but processing overhead increases
Solution Approach 1:
The patent implements partial feedback action where the UE sends HARQ feedback only for dynamically scheduled PDSCH transmissions where HARQ-based retransmission is disabled. This selective feedback approach provides sufficient information for PDCCH optimization without requiring comprehensive feedback for all transmissions, reducing processing overhead while maintaining resource allocation efficiency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may generate hybrid automatic repeat request (HARQ) feedback that indicates a decoding result for a physical downlink control channel (PDCCH) transmission associated with a dynamically scheduled physical downlink shared channel (PDSCH) transmission based at least in part on HARQ-based retransmission being disabled for a HARQ process associated with the dynamically scheduled PDSCH transmission. The UE may transmit the HARQ feedback to a network node. Numerous other aspects are described.