CQI Table Configuration for Reliable Low-Rate 5G Transmission
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Solution Overview
Problem
Current mobile communication systems, particularly in LTE and emerging 5G technologies, face challenges in achieving higher data transmission reliability and lower data transmission rates for Machine Type Communications (MTC) terminals and New Radio Access Technology (NR) terminals, which are not adequately addressed by existing standards.
Innovation Solution
A method and apparatus for receiving and transmitting Channel Quality Indication (CQI) information using higher layer configuration signaling messages to determine CQI tables, which include specific modulation schemes and code rates, allowing for enhanced coverage and scenario-specific adjustments, such as those for eMBB, URLLC, and mMTC scenarios, to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high order modulation and low redundancy error correction coding with high transmission rate are adopted, then system throughput is significantly increased in ideal channel conditions, but communication reliability deteriorates in deep-fading channels
Solution Approach 1:
The patent implements dynamic adaptation of modulation and coding schemes based on real-time channel conditions. The base station receives CQI feedback from terminals and dynamically selects appropriate MCS combinations, transitioning between high-order modulation (e.g., 64QAM) for good channels and low-order modulation (e.g., QPSK) for poor channels, thereby resolving the contradiction between throughput and reliability
Solution Approach 2:
The patent changes multiple parameters simultaneously including modulation order, coding rate, and transport block size based on channel quality indicators. By adjusting these parameters dynamically according to CQI feedback, the system achieves optimal balance between throughput and reliability across varying channel conditions
2Reliability
If low order modulation and high redundancy error correction coding with low transmission rate are adopted, then communication reliability is guaranteed in deep-fading channels, but system throughput is constrained when channel SNR is high
Solution Approach 1:
The system dynamically switches between conservative low-order modulation schemes for unreliable channels and aggressive high-order modulation schemes for reliable channels. This dynamic behavior allows the system to guarantee reliability when needed while maximizing throughput when channel conditions permit
Solution Approach 2:
The patent adjusts transmission parameters including modulation scheme, coding rate, and resource allocation based on channel quality. When CQI indicates good channel conditions, the system increases modulation order and reduces redundancy, thereby unlocking higher throughput while maintaining reliability
3Reliability
If transmit power is increased to combat time-varying characteristics of wireless fading channels, then communication quality is guaranteed in deep-fading channels, but system throughput increase is constrained
Solution Approach 1:
The patent changes multiple transmission parameters beyond just power, including modulation order, coding rate, and resource allocation. This multi-parameter adaptation allows the system to maintain quality through diverse means rather than relying solely on power increase, thereby preserving throughput potential
Data Source
AI summary
The present disclosure provides a method and an apparatus for receiving Channel Quality Indication (CQI) information, as well as a method and an apparatus for transmitting CQI information. The method for receiving CQI information includes: transmitting a higher layer configuration signaling message to a terminal; and receiving CQI information from the terminal. The CQI information is determined based on a CQI table obtained based on the higher layer configuration signaling message. With the above solutions, higher data transmission reliability and lower data transmission rate required for MTC terminals with coverage enhancement and 5G terminals can be achieved.