PUCCH Resource Set Allocation for Low-Latency UCI Feedback
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Solution Overview
Problem
The granularity of PUCCH resource configuration in 5G systems is too coarse, failing to meet the fast feedback requirements of low-latency services, and unified configuration for slot-based and sub-slot-based PUCCH resource allocation leads to limited flexibility and increased resource conflicts.
Innovation Solution
Configuring PUCCH resource sets for different time-domain structures, including determining a target time-domain structure and PUCCH starting symbol, and utilizing a time-domain offset amount to optimize resource allocation for sub-slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If PUCCH resource configuration uses slot-based granularity, then resource allocation is simplified, but feedback latency increases and cannot meet low-latency service requirements
Solution Approach 1:
The patent divides a slot into multiple sub-slots, and further divides sub-slots into multiple time domains. This segmentation allows PUCCH resources to be allocated at a finer granularity (time domain level within sub-slots) rather than at the coarse slot level, enabling faster feedback timing while maintaining manageable configuration complexity through hierarchical structure.
2Device complexity
If a unified PUCCH resource set is configured for both slot-based and sub-slot-based allocation, then configuration is simplified, but resource flexibility decreases and conflicts increase
Solution Approach 1:
The patent configures different PUCCH resource sets with distinct characteristics for different time-domain structures (slot-based vs. sub-slot-based). Each resource set is locally optimized for its specific use case, with parameters such as starting symbols and lengths tailored to the particular time-domain structure, thereby achieving both configuration manageability and allocation flexibility.
Solution Approach 2:
The patent enables dynamic selection between different PUCCH resource sets based on the actual time-domain structure being used. The terminal device can adaptively choose the appropriate resource set (first resource set for slot-based, second resource set for sub-slot-based) according to scheduling requirements, providing dynamic flexibility while maintaining clear configuration separation.
Data Source
AI summary
A method and an apparatus for configuring a PUCCH resource set and determining a starting symbol are disclosed, where the method for configuring a PUCCH resource set may include: determining, by a terminal device, a target time-domain structure; determining, by the terminal device, a group of PUCCH resource sets corresponding to the target time-domain structure, where a group of PUCCH resource sets is respectively configured for a different time-domain structure; and determining, by the terminal device, a PUCCH resource set from a group of PUCCH resource sets corresponding to the target time-domain structure, and determining, by the terminal device, a PUCCH resource from the determined PUCCH resource set, where the determined PUCCH resource is used for transmitting UCI. By applying the solution described in the present application, more flexible PUCCH resource allocation can be realized, and efficiency of resource utilization in a PUCCH resource set can be improved, etc.