MCS Table Subset Selection for Reducing Code Rate Overlap
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Solution Overview
Problem
Current modulation and coding scheme (MCS) tables in communication systems for Machine Type Communication (MTC) and Narrow Band Internet of Things (NB-IoT) technologies exhibit code rate overlap, leading to information redundancy and inefficient use, particularly in scenarios requiring higher data rates and lower latency.
Innovation Solution
A method for configuring MCS tables by selecting subsets based on specific conditions, such as channel conditions and terminal types, to avoid code rate overlap and optimize spectral efficiency, allowing terminals to determine the appropriate MCS table subset for use based on received indicators or scrambling sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single MCS table is used for both MTC and NB-IoT technologies, then device complexity is reduced, but code rate overlap occurs leading to information redundancy
Solution Approach 1:
The patent divides a single MCS table into multiple subsets, where each subset is optimized for specific technologies (MTC, NB-IoT, Redcap). This segmentation eliminates code rate overlap between different technologies while maintaining manageable complexity through conditional selection based on terminal types and coverage enhancement requirements.
2Loss of information
If multiple MCS tables are configured for different technologies, then information redundancy is reduced, but device complexity increases
Solution Approach 1:
The patent implements dynamic MCS table selection where the terminal determines which MCS table subset to use based on received indicators or scrambling sequences. This dynamic approach allows the system to adapt to different terminal types and coverage enhancement needs without permanently storing multiple complete MCS tables, thus reducing complexity while avoiding information redundancy.
3Reliability
If MCS tables are optimized for coverage enhancement, then reliability is improved, but data transmission rate is reduced
Solution Approach 1:
The patent creates different MCS table subsets with locally optimized code rates for specific scenarios. The first MCS table subset is optimized for coverage enhancement with lower code rates, while the second MCS table subset provides higher code rates for scenarios requiring faster data transmission. The terminal selects the appropriate subset based on its specific needs, allowing each to have optimal local quality for its intended purpose.
Data Source
AI summary
A method for configuring a modulation and coding scheme (MCS) table is performed by a terminal, and includes: determining to use at least one of a first MCS table subset or a second MCS table subset in response to meeting a first condition; wherein the first MCS table subset is at least a part of a table in a first MCS table, and the second MCS table subset is at least a part of a table in a second MCS table.