5G Terminal PUCCH Resource Indexing for HARQ Feedback Collision Avoidance
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Solution Overview
Problem
In 5G communication systems, particularly for Ultra-Reliable Low-latency Communication (URLLC), the timing relationship between downlink data transmission and Hybrid Automatic Repeat Request (HARQ) feedback can lead to collisions in Physical Uplink Control Channel (PUCCH) resources, compromising data transmission reliability due to differing time differences between User Equipment (UEs).
Innovation Solution
A data transmission method where a terminal determines resource indexes for uplink control channel resources based on time element offsets or indexes, reducing collisions by associating feedback information with specific resource indexes, thereby improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network side device configures timing relationship between downlink data transmission and HARQ feedback directly, then the flexibility of configuration is improved, but the collision probability of PUCCH resources increases
Solution Approach 1:
The patent segments the PUCCH resource space by introducing a second dimension (resource group index) in addition to the resource set index. This segmentation allows multiple feedback messages to be mapped to different resource groups, reducing collision probability while maintaining flexible timing configuration between downlink data and HARQ feedback.
Solution Approach 2:
The patent adds another dimension to the PUCCH resource allocation by introducing resource group indices in addition to resource set indices. This dimensional expansion transforms the resource selection from a one-dimensional space to a two-dimensional space, enabling better separation of multiple feedback messages and reducing collisions while preserving configuration flexibility.
2Productivity
If multiple feedback messages are mapped to the same PUCCH resource, then the resource utilization is improved, but the collision probability increases
Solution Approach 1:
The patent segments PUCCH resources into multiple resource groups, each with its own set of resource indices. This segmentation allows the system to maintain high resource utilization by mapping multiple feedback messages to the same resource set while avoiding collisions through different resource group assignments, thus preserving both productivity and reliability.
Solution Approach 2:
By introducing resource group indices as an additional dimension, the patent enables the system to map multiple feedback messages to the same resource set (maintaining resource utilization) while differentiating them through different resource groups (avoiding collisions). This dimensional approach resolves the contradiction between resource utilization and collision avoidance.
3Adaptability or versatility
If the time differences between downlink data transmission and HARQ feedback are made different for different UEs, then the flexibility of timing configuration is improved, but the PUCCH resource collision within one TTI increases
Solution Approach 1:
The patent segments the PUCCH resource space into multiple resource groups that can be selectively assigned to different UEs based on their timing requirements. This segmentation allows the system to maintain flexible timing configuration for different UEs while assigning them to different resource groups to avoid PUCCH collisions within the same TTI.
Solution Approach 2:
The patent applies local quality by allowing different UEs to be assigned to different resource groups based on their specific timing requirements and collision risk. This localized differentiation enables flexible timing configuration for each UE while preventing collisions through appropriate resource group assignment, addressing the contradiction between timing flexibility and collision avoidance.
Data Source
AI summary
Provided are a data transmission method and a terminal. In the method, a terminal receives Downlink Control Information (DCI) sent by a network side device; the terminal detects downlink data sent by the network side device based on the DCI; and the terminal determines, according to an index of a time element for transmitting downlink information or according to a time element offset between the time element for transmitting the downlink information and a time element for transmitting feedback information corresponding to the downlink data, a resource index of a target uplink control channel resource for transmitting the feedback information, the downlink information including at least one of the DCI and the downlink data.