HARQ-ACK/NACK Feedback Resource Allocation in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency for packet data transmission, particularly in next-generation mobile communication systems like new radio access technology (NR) and long-term evolution (LTE), where efficient HARQ-ACK/NACK feedback methods are needed to enhance performance.
Innovation Solution
A method for HARQ-ACK/NACK feedback in wireless communication systems, where a user equipment (UE) determines an uplink resource for transmitting Negative Acknowledgment (NACK) and decides whether to transmit a Channel Quality Indicator (CQI) together with the NACK, based on specific criteria such as target service, quality of service (QoS), block error rate (BLER) requirements, and latency requirements, to optimize resource allocation and feedback efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NACK and CQI are transmitted together on the same uplink resource, then feedback efficiency is improved, but resource allocation complexity increases
Solution Approach 1:
The patent combines NACK and CQI transmissions into a single uplink resource, merging two separate feedback processes into one unified transmission. This reduces the number of separate resource allocations needed and improves overall feedback efficiency by eliminating redundant transmission overhead.
Solution Approach 2:
The patent introduces dynamic resource allocation where the uplink resource for NACK transmission is selected based on whether CQI needs to be transmitted. The UE determines the appropriate resource dynamically based on channel conditions and feedback requirements, allowing flexible adaptation between different transmission scenarios.
2Reliability
If multiple uplink resources are configured for NACK transmission, then feedback reliability is improved, but device complexity increases
Solution Approach 1:
The patent configures multiple uplink resources with different characteristics (e.g., different reliability levels, different latency properties) and allows the UE to select the appropriate resource based on the specific feedback requirements. Each resource has optimized local qualities suited for different transmission scenarios.
Solution Approach 2:
The system enables dynamic selection among multiple configured uplink resources based on real-time conditions. The UE can adaptively choose which resource to use for NACK transmission depending on channel quality, latency requirements, and whether CQI is being transmitted, thereby improving reliability without requiring all resources to be active simultaneously.
Data Source
AI summary
A method for hybrid automatic repeat request-acknowledgment/negative-acknowledgment (HARQ-ACK/NACK) feedback in a wireless communication system, according to one embodiment of the present disclosure, is performed by a terminal and may comprise the steps of: determining an uplink resource for transmitting a NACK if the NACK must be transmitted as HARQ-ACK/NACK feedback for a downlink signal; determining whether to transmit, along with the NACK, a channel quality indicator (CQI) associated with the downlink signal corresponding to the NACK; and if it is determined to transmit the CQI along with the NACK, transmitting the NACK and the CQI on the determined uplink resource.