MCS Table Determination via RRC Signaling for URLLC
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Solution Overview
Problem
In the 5G NR system, the inability to accurately determine the MCS table for URLLC service leads to poor user experience due to the lack of indication mechanisms for MCS tables defined for URLLC, which are not supported by existing RRC signaling.
Innovation Solution
A method is introduced where the base station sends RRC signaling with indication information to the terminal, using a cqi-Table or new-mcs-Table to indicate the type of MCS table, allowing the terminal to determine the correct MCS table from a set of predefined tables, including those for eMBB and URLLC, ensuring accurate communication processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple MCS tables are defined for different services (eMBB and URLLC), then the system can support diverse communication requirements, but the terminal cannot accurately determine which MCS table to use due to lack of indication mechanisms
Solution Approach 1:
The patent introduces indication information as an intermediary element between the base station and terminal. This indication information explicitly specifies which MCS table should be used, resolving the information loss problem while maintaining support for multiple MCS tables for different services
Solution Approach 2:
The patent segments the MCS table selection process by introducing separate indication mechanisms for different service types. The indication information structure is divided into fields that can specify different MCS table types (eMBB, URLLC with different BLER targets), allowing the terminal to accurately determine the correct table without confusion
2Adaptability or versatility
If URLLC service supports multiple bler-Targets, then the system can meet different reliability requirements, but the terminal cannot determine the correct MCS table without additional indication
Solution Approach 1:
The patent applies local quality by making the indication information structure service-specific. Different fields and parameters are provided for different URLLC BLER targets, allowing the terminal to determine the correct MCS table based on the specific service requirements without increasing overall system complexity
3Device complexity
If existing RRC signaling does not support URLLC MCS table indication, then the signaling structure remains simple, but the terminal cannot accurately determine the MCS table for URLLC
Solution Approach 1:
The patent dynamically extends the RRC signaling structure by adding optional indication information fields that can be activated based on service type. This allows the signaling to remain simple for eMBB services while providing enhanced URLLC MCS table indication when needed, balancing simplicity and reliability
Data Source
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AI summary
An MCS table determination method, terminal, and base station and readable storage medium, used to determine an MCS table to be used in a communication process from out of a plurality of MCS tables. The method comprises: a terminal receives radio resource control (RRC) signaling sent by a base station and carrying indication information, the indication information being used to indicate a first MCS table, the first MCS table being one of a first MCS table type and a second MCS table type; and the terminal determines the first MCS table on the basis of the indication information.