MCS Configuration for 16QAM in NB-IoT Release-17
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Solution Overview
Problem
The existing modulation and coding schemes (MCS) in NB-IoT technology cannot satisfy the modulation and coding requirements when the maximum modulation scheme is upgraded from QPSK to 16QAM in Release-17.
Innovation Solution
A configuration method and apparatus that determine an MCS set based on a higher-layer configuration parameter, which indicates whether data transmission supports 16QAM modulation, and configure the MCS of data accordingly, using either a first MCS set or a second MCS set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the maximum modulation scheme is upgraded from QPSK to 16QAM in NB-IoT Release-17, then data transmission rates are improved, but the existing MCS cannot satisfy the modulation and coding requirements
Solution Approach 1:
The patent introduces a new parameter 'modulationScheme' that can take values indicating different modulation schemes (QPSK, 16QAM). This parameter change enables the system to adapt to higher order modulation while maintaining reliable communication by selecting appropriate MCS indices from extended tables that are specifically designed for 16QAM modulation characteristics.
Solution Approach 2:
The patent implements dynamic MCS selection where the gNB configures multiple MCS tables (first MCS table for QPSK, second MCS table for 16QAM) and dynamically selects which table to use based on the current modulation scheme indicated by the modulationScheme parameter. This dynamic adaptation allows the system to optimize performance for each modulation type while ensuring reliable operation.
2Speed
If the modulation scheme is upgraded to support 16QAM, then higher data rates are achieved, but the existing MCS set becomes inadequate
Solution Approach 1:
The patent creates a universal MCS configuration mechanism that can handle both QPSK and 16QAM modulation schemes through a single gNB configuration process. The gNB configures multiple MCS tables with different characteristics, and the modulationScheme parameter universally indicates which table to use, making the system adaptable to different modulation schemes without requiring separate configuration procedures for each scheme.
Solution Approach 2:
The patent segments the MCS configuration into multiple distinct MCS tables (first MCS table, second MCS table), where each table is optimized for specific modulation schemes. This segmentation allows independent optimization of MCS parameters for QPSK and 16QAM, enabling the system to achieve high data rates with 16QAM while maintaining robust performance with QPSK through dedicated table selections.
Data Source
AI summary
Provided are a configuration method and apparatus, a receiving method and apparatus, a device, and a storage medium. The configuration method includes: determining a modulation and coding scheme (MCS) set based on a higher-layer configuration parameter; and configuring an MCS of data based on the MCS set; where the higher-layer configuration parameter indicates whether data transmission supports a 16 quadrature amplitude modulation (16QAM) modulation scheme, and the MCS set includes one or more of: a first MCS set and a second MCS set.