MCS Table Determination for NR-V2X Sidelink Transmission
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Solution Overview
Problem
NR-V2X sidelink technology does not specify how to use MCS tables for direct communications between terminals.
Innovation Solution
A user apparatus is provided with a control unit to determine and a transmission unit to perform sidelink transmission using MCS tables, which can be configured based on various parameters such as SCI format, DCI format, RNTI, resource allocation mode, and resource pool configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MCS tables are not specified for NR-V2X sidelink, then the system maintains flexibility in implementation, but the communication reliability and transmission efficiency are compromised due to lack of standardized modulation and coding schemes
Solution Approach 1:
The patent applies parameter changes by defining specific MCS table parameters (modulation order, code rate) for sidelink communication. The control unit determines appropriate MCS indices from standardized tables based on channel conditions, transforming the undefined modulation and coding parameters into controlled, selectable values that ensure reliable transmission while maintaining implementation flexibility through standardized options.
2Adaptability or versatility
If multiple MCS tables are supported for different transmission scenarios, then the adaptability to various channel conditions improves, but the device complexity and specification difficulty increase
Solution Approach 1:
The patent segments the MCS selection into multiple standardized tables (e.g., Table 2.1.1.1-1 for QPSK, Table 2.1.1.1-2 for 16QAM, Table 2.1.1.1-3 for 64QAM). Each table is optimized for specific modulation orders and channel conditions. The control unit selects the appropriate table based on the transmission scenario, providing adaptability without requiring a single complex unified table, thus reducing specification difficulty.
Solution Approach 2:
The patent creates universal MCS tables that can be applied across different sidelink transmission scenarios (V2V, V2I, V2P). The same standardized tables serve multiple purposes: different modulation orders, various code rates, and multiple transmission modes. This multi-functionality approach allows a single set of tables to handle diverse channel conditions without increasing device complexity.
3Productivity
If MCS table selection is left undefined, then implementation flexibility is maintained, but transmission efficiency decreases due to lack of optimized modulation and coding schemes
Solution Approach 1:
The patent performs preliminary action by pre-defining optimized MCS tables with carefully selected modulation orders and code rates for different channel conditions. Instead of determining MCS parameters in real-time during transmission, the tables are prepared in advance with optimal configurations. The control unit simply selects from these pre-optimized options, achieving high transmission efficiency without complex real-time optimization, thus maintaining ease of implementation.
Data Source
AI summary
A user apparatus is provided that includes a control unit configured to determine an MCS (Modulation and Coding Scheme) table and a transmission unit configured to perform sidelink transmission in accordance with the MCS table.