HARQ-ACK Transmission Time Determination for Wireless Downlink
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Solution Overview
Problem
The increasing demand for high data throughput and communication capacity in wireless communication systems, particularly due to the rise of M2M communication and high-density user equipment, poses challenges in efficiently managing limited radio resources and reducing latency, especially for services sensitive to reliability and latency like eMBB, mMTC, and URLLC.
Innovation Solution
A method for determining optimal transmission times for HARQ-ACK in wireless communication systems, allowing for efficient reception and transmission of downlink channels by adjusting based on HARQ deferral, enabling flexible scheduling and reducing latency, thereby improving overall system throughput and supporting diverse services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of UEs and data volume increase to satisfy high data throughput demand, then communication capacity improves, but radio resource efficiency deteriorates
Solution Approach 1:
The patent segments the downlink channel reception and HARQ-ACK transmission into multiple time instances. By allowing a second downlink channel to be received after the first HARQ-ACK transmission time (when HARQ deferral is applied), the system divides the communication flow into discrete manageable segments, enabling efficient resource utilization despite increased UE density and data volume.
Solution Approach 2:
The patent introduces dynamic scheduling flexibility through HARQ deferral mechanisms. The transmission timing of downlink channels is made dynamic rather than fixed, allowing the base station to adjust scheduling based on channel conditions, UE status, and resource availability. This dynamic approach optimizes radio resource efficiency while supporting high data throughput requirements.
2Adaptability or versatility
If HARQ deferral is applied to determine transmission timing, then scheduling flexibility improves, but transmission time determination complexity increases
Solution Approach 1:
The patent establishes preliminary rules and conditions for HARQ deferral application before actual transmission occurs. The UE and base station agree on deferral conditions, timing relationships, and channel association rules in advance. This preliminary configuration simplifies real-time decision-making by providing a predefined framework that reduces the complexity of transmission time determination while maintaining scheduling flexibility.
Data Source
AI summary
A user equipment (UE) may determine a first transmission time for a first hybrid automatic repeat request acknowledgement (HARQ-ACK) for a first downlink channel associated with a first HARQ process; and receive a second downlink channel associated with the first HARQ process. Receiving the second downlink channel for the first HARQ process may include: receiving the second downlink channel after the first transmission time based on the first HARQ-ACK being not subject to HARQ deferral; and receiving the second downlink channel after a second transmission time based on the first HARQ-ACK being subject to the HARQ deferral and the first transmission time being determined by the HARQ deferral from the second transmission time earlier than the first transmission time.