MCS Table Segmentation for URLLC Reliability
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in adapting to the high latency and reliability requirements of Ultra-Reliable and Low Latency Communications (URLLC) services due to high code rates in existing Modulation and Coding Schemes (MCS) tables, which limit the ability to support lower Block Error Rates (BLER) necessary for URLLC.
Innovation Solution
A new MCS table is introduced with lower code rates and specific threshold values to support URLLC services, where the code rate multiplied by 1024 is adjusted to meet the requirements, and the modulation schemes for adjacent entries are kept the same or differ by a threshold to optimize resource allocation and channel estimation precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a current MCS table with higher code rates is used, then system productivity is improved, but URLLC service reliability deteriorates
Solution Approach 1:
The patent segments the MCS table into multiple versions: a first MCS table for eMBB services with higher code rates optimized for productivity, and a second MCS table for URLLC services with lower code rates optimized for reliability. This segmentation allows each service type to use the most appropriate code rate configuration without compromising the other.
Solution Approach 2:
The patent implements dynamic switching between different MCS tables based on service requirements. The network device can dynamically select which MCS table to use depending on whether the current transmission is for eMBB or URLLC services, allowing the system to adapt its code rate characteristics in real-time to meet varying reliability and productivity demands.
2Reliability
If a lower code rate is used to reduce BLER, then URLLC service reliability is improved, but system productivity deteriorates
Solution Approach 1:
The patent creates distinct MCS table segments for different service priorities. The second MCS table contains lower code rates specifically for URLLC reliability-critical transmissions, while the first MCS table maintains higher code rates for eMBB productivity-oriented transmissions. This prevents the productivity penalty of lower code rates from affecting overall system throughput.
Solution Approach 2:
The patent applies different code rate qualities to different service contexts. Rather than uniformly lowering code rates across all services (which would harm productivity), the lower code rate quality is applied locally only where URLLC reliability is critical, while eMBB services continue to benefit from higher code rate quality for maximum throughput.
3Productivity
If the MCS table is optimized for eMBB services, then system productivity is improved, but adaptability to URLLC services deteriorates
Solution Approach 1:
The patent creates a universal MCS table framework that serves multiple service types. The system maintains both a first MCS table optimized for eMBB and a second MCS table optimized for URLLC, allowing the same physical downlink shared channel to be adapted for different service requirements through selective table usage, achieving multi-functionality without requiring separate physical channels.
Solution Approach 2:
The patent enables dynamic adaptation between different service types through selective MCS table application. The network device can switch between the eMBB-optimized first MCS table and the URLLC-optimized second MCS table based on service type, allowing the system to maintain high productivity for eMBB while being fully adaptable to URLLC requirements when needed.
Data Source
AI summary
A method, and related apparatuses are disclosed, to provide an MCS corresponding to a lower code rate. The communication method includes: sending a first CQI number to a network device, wherein the first CQI number is determined based on a first CQI table; and receiving an MCS number in a first MCS table from the network device, wherein the first MCS table comprises an entry that is not comprised in the first CQI table, and at least one entry whose modulation scheme is 64QAM in the first CQI table, wherein a BLER corresponding to the first CQI table is 10e-5, and values obtained by multiplying code rates by 1024 in the first CQI table comprise 30 and 50.