Enhanced HARQ ACK/NACK Configurations for PDCCH Reception Failure Detection
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Solution Overview
Problem
In wireless communication systems, particularly in 5G New Radio (NR), user equipment (UE) may fail to receive initial physical downlink control channel (PDCCH) communications due to various reasons such as monitoring different beams, PDCCH multi-user MIMO interference, or improper aggregation levels, leading to increased block error rates and latency.
Innovation Solution
The implementation of enhanced hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) configurations, which include receiving configuration information from a network node, identifying failures in receiving initial PDCCH communications, and transmitting enhanced HARQ ACK/NACK information to facilitate adaptive re-transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If enhanced HARQ ACK/NACK configurations are implemented, then latency and power consumption are reduced, but device complexity increases
Solution Approach 1:
The system performs preliminary detection of PDCCH reception failures using enhanced HARQ ACK/NACK configurations before actual data transmission failures occur. By detecting beam failures or PDCCH reception issues early through specialized feedback mechanisms, the system can proactively switch beams or reconfigure connections, preventing latency associated with waiting for standard HARQ timeouts and reducing the need for extensive power consumption during reconnection procedures.
2Loss of information
If enhanced HARQ ACK/NACK configurations are implemented, then signaling overhead is reduced, but device complexity increases
Solution Approach 1:
The patent merges the HARQ ACK/NACK feedback mechanism with beam failure detection and PDCCH reception status reporting. Instead of maintaining separate signaling channels for HARQ acknowledgments and beam failure indicators, the system combines these functions into a unified feedback configuration where a single signaling message conveys both HARQ status and beam/PDCCH reception information, thereby reducing overall signaling overhead while managing complexity through integrated processing.
3Adaptability or versatility
If initial PDCCH communications are transmitted with non-reserved MCS, then transmission flexibility is improved, but reliability of reception decreases
Solution Approach 1:
The system employs enhanced HARQ ACK/NACK feedback configurations that provide detailed reception status information back to the transmitting network node. When initial PDCCH communications are sent with non-reserved MCS values for flexibility, the feedback mechanism detects reception failures and communicates this to the network, which can then adjust MCS values for retransmissions or switch to more robust modulation schemes, thereby maintaining reliability despite initial transmission flexibility.
4Productivity
If HARQ process failures are avoided through enhanced configurations, then productivity is improved, but device complexity increases
Solution Approach 1:
The enhanced HARQ ACK/NACK configuration enables the UE to autonomously detect PDCCH reception failures and initiate appropriate feedback without requiring constant network intervention. The device self-monitors reception status using the enhanced configuration and self-manages the feedback generation, thereby improving productivity by preventing HARQ process failures while managing complexity through self-service operations rather than requiring complex network-side control mechanisms.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, configuration information indicative of an enhanced hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) configuration associated with initial physical downlink control channel (PDCCH) communications. The UE may receive, from the network node, a re-transmission of an initial PDCCH communication. The UE may identify a failure of the UE to receive the initial PDCCH communication. The UE may transmit, to the network node in association with the configuration information, enhanced HARQ ACK/NACK information indicative of the failure of the UE to receive the initial PDCCH communication. Numerous other aspects are described.