Base Station Resource Block Segmentation for NOMA Signal Separation
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Solution Overview
Problem
In 5G NR systems, the coexistence of CP-OFDM and DFT-S-OFDM signals in the same radio resource block leads to difficulty in signal separation and increased error rates due to differences in Peak to Average Power Ratio (PAPR) and modulation characteristics, affecting uplink data transmission performance.
Innovation Solution
A base station apparatus transmits control signals to terminal apparatuses, specifying resource block allocation and radio modulation scheme types, including frequency selection information for continuous or non-continuous subcarrier allocation, to facilitate easier signal separation and error rate improvement in Non-Orthogonal Multiple Access (NOMA) systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio transmission schemes (CP-OFDM and DFT-S-OFDM) are allowed to coexist in the same radio resource block, then system adaptability and versatility are improved, but signal separation difficulty increases and error rates increase
Solution Approach 1:
The patent segments the radio resource block allocation by assigning specific resource blocks to specific radio transmission schemes. The base station configures the terminal to use either CP-OFDM or DFT-S-OFDM in designated resource blocks, preventing mixed signals in the same resource block. This segmentation resolves the contradiction by maintaining scheme flexibility through configuration options while ensuring reliable signal separation through physical resource isolation.
2Ease of operation
If terminal apparatus autonomously determines radio transmission scheme, then device complexity and operation autonomy are improved, but signal separation difficulty and error rates increase
Solution Approach 1:
The base station performs preliminary configuration by assigning specific resource blocks to specific radio transmission schemes before the terminal apparatus transmits data. The terminal apparatus receives configuration information indicating which resource blocks should use CP-OFDM and which should use DFT-S-OFDM. This preliminary assignment ensures that even though the terminal autonomously selects transmission schemes, the selections are constrained to prevent signal collision and separation difficulties.
3Productivity
If contention-based access is used to reduce control information overhead, then productivity is improved, but signal collision occurs when multiple terminals transmit in the same radio resource
Solution Approach 1:
The patent applies local quality by assigning different radio transmission schemes (CP-OFDM or DFT-S-OFDM) to different resource blocks based on local conditions. The base station configures specific resource blocks for specific schemes, and terminals use appropriate schemes in their assigned blocks. This local differentiation allows contention-based access to proceed efficiently while reducing signal collision through scheme diversity in the same time-frequency resources.
Data Source
AI summary
A base station apparatus controls an access scheme for each radio resource by using higher layer signaling such that only signals generated by a same type of a signal generation method are multiplexed for each radio resource.