HARQ Feedback Control for Common Downlink Data in NR
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Solution Overview
Problem
In the NR communication system, there is a need for efficient methods for multiple terminals to independently transmit feedback information for common data received from a base station, as existing technologies do not adequately address how to manage hybrid automatic repeat request (HARQ) feedback across various communication scenarios.
Innovation Solution
The method involves a terminal receiving a higher layer message indicating whether to enable or disable HARQ feedback, and when enabled, transmitting appropriate HARQ responses based on an ACK/NACK or NACK-only scheme, with multiplexing of responses in the same slot when resources overlap, and prioritizing feedback based on data priority.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple terminals independently transmit HARQ feedback for common data, then feedback reliability is improved, but feedback resource collision and system complexity increase
Solution Approach 1:
The feedback transmission is segmented by introducing two distinct feedback schemes: Type 1 HARQ feedback for individual terminals and Type 2 HARQ feedback for group-common data. This segmentation allows different feedback mechanisms to handle different scenarios, reducing resource collisions while maintaining reliability.
Solution Approach 2:
The patent implements dynamic feedback transmission by allowing terminals to switch between Type 1 and Type 2 feedback schemes based on DCI indications. The base station can dynamically configure which feedback type to use for specific downlink transmissions, optimizing resource utilization and reducing complexity.
2Reliability
If HARQ feedback is always transmitted, then data transmission reliability is improved, but uplink resource consumption increases
Solution Approach 1:
The patent applies partial action by implementing selective HARQ feedback transmission. Terminals transmit Type 2 HARQ feedback only for group-common downlink data when configured, rather than always transmitting feedback for all downlink data. This reduces uplink resource consumption while maintaining necessary reliability through targeted feedback transmission.
3Adaptability or versatility
If HARQ feedback enabled/disabled indicator is included in DCI, then feedback control flexibility is improved, but DCI message size and processing complexity increase
Solution Approach 1:
The patent extracts the HARQ feedback control mechanism into a separate configurable indicator within DCI format 1_x. This allows the feedback enabled/disabled indication to be independently controlled and configured through higher-layer parameters, separating the control logic from the core DCI processing and reducing overall system complexity.
4Adaptability or versatility
If Type 1 and Type 2 HARQ feedback are both supported, then communication scenario adaptability is improved, but terminal processing complexity increases
Solution Approach 1:
The patent implements dynamic feedback scheme selection where terminals are configured to use either Type 1 or Type 2 HARQ feedback based on DCI indications from the base station. This dynamic configuration allows terminals to adapt to different communication scenarios without permanently supporting both complex feedback types, reducing processing complexity while maintaining scenario adaptability.
Data Source
AI summary
An operation method of a terminal in a communication system may comprise: receiving, from a base station, a higher layer message including information indicating that first DCI including a HARQ feedback enabled/disabled indicator is configured; receiving the first DCI from the base station; receiving first downlink data from the base station based on first scheduling information included in the first DCI; and determining whether to transmit a first HARQ response for the first downlink data based on the HARQ feedback enabled/disabled indicator included in the first DCI.