Grant-Free NOMA Resource Segmentation for Interference Reduction
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Solution Overview
Problem
Current 5G communication systems face challenges in providing efficient data channel transmission methods, particularly in supporting non-orthogonal multiple access (NOMA) without grant-based resource allocation, which leads to increased interference among terminals sharing the same resource.
Innovation Solution
A grant-free data channel transmission method is proposed, where terminals receive configuration information for a grant-free transmission resource, select and transmit uplink control information, and transmit physical uplink shared channels (PUSCH) using a part of the configured resource, reducing interference by allowing flexible resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free transmission is used for NOMA, then resource allocation efficiency is improved, but signal interference between terminals increases
Solution Approach 1:
The grant-free transmission resource is divided into multiple resource blocks, and each terminal is assigned to transmit on different resource blocks. This segmentation of the transmission resource reduces signal interference between terminals while maintaining the efficiency benefits of grant-free NOMA transmission.
2Adaptability or versatility
If multiple terminals share the same transmission resource, then resource utilization is improved, but decoding performance deteriorates due to increased interference
Solution Approach 1:
Different terminals are assigned to transmit on different resource blocks within the grant-free transmission resource. This creates local quality differentiation where each terminal experiences different channel conditions and interference levels on its assigned resource block, improving overall decoding performance while maintaining high resource utilization.
Data Source
AI summary
Provided is a grant-free data communication method of a terminal in a wireless communication system, the method including receiving configuration information of a grant-free transmission resource, selecting a transmission resource for transmitting a physical uplink shared channel (PUSCH), based on the configuration information, transmitting uplink control information (UCI) including scheduling information of the selected transmission resource, and transmitting the PUSCH through the selected transmission resource.