HARQ-ACK Feedback Timing Beyond 120 kHz SCS
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Solution Overview
Problem
The existing 3GPP standard for HARQ feedback timing parameters is inadequate for sub-carrier spacings greater than 120 KHz, leading to inefficiencies in data scheduling and increased overhead due to the inability to accurately indicate HARQ-ACK feedback timing.
Innovation Solution
A method and device for HARQ feedback that involves predefining a target timeline parameter sequence with one-to-one correspondence between sequence index values and timeline parameter values, allowing for accurate HARQ-ACK feedback timing by ensuring the feedback occurs after the terminal has fully received the downlink data, even at higher sub-carrier spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher sub-carrier spacing (SCS) is used to overcome Doppler and phase noise at higher frequencies, then communication reliability is improved, but the range of timeline parameter k1 increases making traditional static configuration inadequate
Solution Approach 1:
The patent applies dynamics by making the timeline parameter k1 adjustable and adaptable rather than static. The base station dynamically selects appropriate k1 values from a predefined set based on actual channel conditions and SCS requirements, allowing the system to adapt to varying Doppler and phase noise characteristics at different frequencies while maintaining optimal communication reliability
Solution Approach 2:
The patent changes the parameter configuration approach by defining a set of possible k1 values {1, 2, 3, 4, 5, 6, 7, 8} and selecting from these based on SCS and channel conditions. This parameter change mechanism allows the system to handle the increased timeline parameter range required for higher SCS values (240 KHz, 480 KHz, 960 KHz) without requiring completely new configuration schemes
2Adaptability or versatility
If the timeline parameter range is expanded to accommodate higher SCS values, then adaptability to high frequency communication is improved, but indication overhead increases
Solution Approach 1:
The patent segments the timeline parameter indication into two parts: a predefined set of k1 values that covers the expanded range needed for high SCS, and a selection mechanism that indicates which specific value to use. This segmentation allows the system to support a wide range of timing values without transmitting the entire range, thereby reducing indication overhead while maintaining adaptability to high frequency communication scenarios
Solution Approach 2:
The patent uses partial action by providing a predefined set of k1 values that is sufficient to cover the required range for high SCS scenarios without being exhaustive. The base station selects only the necessary subset of values needed for current channel conditions, avoiding the overhead of configuring or indicating all possible values while still providing adequate adaptability
3Device complexity
If traditional static k1 configuration is used, then device complexity is reduced, but it cannot meet the timing requirements for SCS greater than 120 KHz
Solution Approach 1:
The patent transitions from static to dynamic configuration by establishing a predefined set of k1 values that can be selectively applied based on SCS and channel conditions. This dynamic approach maintains relative simplicity through the use of a structured predefined set while significantly improving timing indication capability to meet the requirements of SCS values greater than 120 KHz
Solution Approach 2:
The patent creates a universal timeline parameter configuration scheme that works across multiple SCS values (120 KHz, 240 KHz, 480 KHz, 960 KHz) and different channel conditions. The predefined set of k1 values serves multiple functions: it provides adequate timing range for high SCS, maintains backward compatibility with lower SCS values, and adapts to varying Doppler and phase noise characteristics, thereby achieving multi-functionality with a single configuration framework
Data Source
AI summary
Provided in the embodiments of the present application are an HARQ feedback method, a terminal, and a base station. The method includes obtaining a target timeline parameter value for indicating a timing at which the terminal feeds back HARQ-ACK; a target timeline parameter sequence being predefined between the terminal and a base station, and the target timeline parameter sequence including multiple sequence index values and multiple timeline parameter values which have one-to-one correspondence; the timeline parameter value indicating slot intervals between a HARQ-ACK feedback slot and a last symbol of PDSCH, or the timeline parameter value indicating a slot where a PUCCH resource is located and the slot where the PUCCH resource is located corresponding to the HARQ-ACK feedback slot; and the target timeline parameter value being one of multiple timeline parameter values, and a time corresponding to the target timeline parameter value being equal to or greater than a time corresponding to a capability parameter value of PDSCH reception processing for UE; and feeding back the HARQ-ACK to the base station on the slot corresponding to the target timeline parameter value.