Grant-Free PDSCH Transmission with SPS Overlap Resolution

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing 5G communication systems face challenges in efficiently managing overlapping time resources for grant-free data transmission, leading to inefficient use of wireless resources and potential degradation of service performance.

Innovation Solution

A method is introduced where a terminal or base station identifies and excludes PDSCHs with the lowest SPS configuration index from overlapping channels, ensuring data transmission occurs only on non-overlapping resources, thereby optimizing resource usage and prioritizing service delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If grant-free data transmission is used to efficiently use wireless resources, then resource utilization is improved, but overlapping time resources cause interference and service performance degradation

Engineering Contradiction:

Improveresource utilizationVSAvoidservice performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station performs preliminary identification of overlapping PDSCH resources before data transmission. By proactively detecting time resource overlaps between multiple PDSCHs scheduled for the terminal, the system can pre-determine which resources to exclude, preventing interference before it occurs and ensuring reliable service delivery while maintaining efficient resource utilization

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The set of scheduled PDSCH resources is segmented into two groups: overlapping resources (to be excluded) and non-overlapping resources (to be used for transmission). By dividing the resource set and selectively excluding only the overlapping portion, the system maintains high resource utilization while eliminating interference, resolving the contradiction between productivity and reliability

Inventive Principle:

Principle #1Segmentation

2Productivity

If multiple PDSCHs are scheduled in overlapping time resources, then wireless resource usage is increased, but interference occurs and data transmission reliability decreases

Engineering Contradiction:

Improvewireless resource usageVSAvoiddata transmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The overlapping PDSCH resources are extracted and excluded from the transmission set. The base station identifies which PDSCHs have time resource overlaps and removes only those specific resources from the scheduled transmission, allowing non-overlapping resources to be utilized fully. This selective extraction maintains high resource usage while ensuring transmission reliability by eliminating interfering resources

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP4358611B1Methods and apparatuses for grant-free data transmission in wireless communication system

Publication Date: 2025.10.29 SAMSUNG ELECTRONICS CO LTD

Figure 1
Figure 2
Figure 3

AI summary

A terminal and a method performed by a terminal in a communication system are provided, the method including: receiving, from a base station, a semi-persistent scheduling, SPS, configuration including an SPS configuration index; in case that at least two PDSCHs are in a slot: performing reception of a PDSCH with a lowest SPS configuration index based on the SPS configuration index, and performing exclusion of the received PDSCH and an overlapped PDSCH that is overlapped with the received PDSCH from a set of PDSCHs; and until the set of the PDSCHs is empty, repeating the reception and the exclusion. Also, a base station and a method for a base station are provided.