Enhanced CQI Tables for NR-URLLC Reliability
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Solution Overview
Problem
Current CQI tables in wireless communication systems, particularly those for New Radio (NR) systems, are insufficient in meeting the low latency and high reliability requirements of NR-URLLC, as they do not adequately support the necessary block error rate and spectral efficiency for time-varying fading channel conditions and interference from multiple users.
Innovation Solution
The implementation of enhanced CQI tables with multiple entries that include specific modulation schemes, code rates, and efficiencies, allowing wireless devices to adaptively adjust transmission parameters to meet block error rate requirements, including the use of QPSK and 64-QAM modulation methods with code rates and efficiencies tailored for different channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CQI tables are used in NR systems, then basic communication functionality is maintained, but the low latency and high reliability requirements of NR-URLLC cannot be met
Solution Approach 1:
The patent implements dynamic CQI tables that can be adaptively selected and configured based on current channel conditions, traffic type, and service requirements. The CQI table is no longer static but dynamically adjusted to match time-varying fading channel conditions, enabling the system to optimize modulation and coding schemes in real-time for both eMBB and NR-URLLC services
Solution Approach 2:
The patent modifies CQI table parameters including adding new entries with specific modulation schemes (QPSK, 64-QAM), adjusting code rates (including low code rates ≤120/1024), and configuring spectral efficiency values to meet the stringent reliability requirements of NR-URLLC while maintaining compatibility with existing NR systems
2Productivity
If higher code rates are used to increase spectral efficiency, then data transmission speed improves, but block error rate increases under time-varying fading channel conditions
Solution Approach 1:
The patent enables dynamic adjustment of code rates based on channel quality indicators. The CQI table includes multiple code rate options (including low code rates ≤120/1024 for reliable transmission and higher code rates for good channel conditions), allowing the system to dynamically select appropriate code rates that balance spectral efficiency and block error rate requirements for different service types
Solution Approach 2:
The patent applies different code rate strategies to different service types and channel conditions. For NR-URLLC traffic, lower code rates (≤120/1024) are used to ensure high reliability, while for eMBB traffic with better channel conditions, higher code rates are used to maximize spectral efficiency. This localized optimization resolves the contradiction between productivity and reliability
3Reliability
If adaptive coded modulation techniques are implemented to meet block error rate requirements, then transmission reliability improves, but system complexity increases
Solution Approach 1:
The patent segments the CQI table into multiple distinct tables or entry types, each optimized for specific service requirements (eMBB, NR-URLLC). This segmentation allows the system to select pre-configured, service-specific CQI tables rather than implementing complex real-time optimization algorithms, thereby maintaining reliability while reducing implementation complexity
Solution Approach 2:
The patent performs preliminary configuration of CQI tables with pre-calculated modulation schemes, code rates, and spectral efficiency values for different service types and channel conditions. This preliminary action eliminates the need for complex real-time calculations during transmission, reducing system complexity while maintaining the ability to meet block error rate requirements through adaptive selection of pre-optimized parameters
Data Source
AI summary
Described are methods, systems and devices for the transmission and reception of channel quality indicator (CQI) information over an physical channel to facilitate, for example, meeting block error rate requirements in emerging systems. One example method includes transmitting an index associated with a quality of the physical channel, where the index corresponds to an entry in a parameter table set. Another example method includes receiving an index associated with the quality of the downlink physical channel, and transmitting a plurality of data blocks, where contents of the plurality of data blocks are encoded and modulated using a code rate and a modulation scheme, respectively, which are selected from an entry in the parameter tables corresponding to the index. In both exemplary methods, one or more parameter tables include at least three entries comprising code rates having values less than or equal to 120/1024.