Extended Range CQI Reporting for URLLC SINR Precision
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Solution Overview
Problem
Current 5G NR technologies face challenges in accurately predicting signal quality distribution for ultra-reliable low-latency communication (URLLC) in industrial IoT scenarios due to inadequate time for channel measurement, inaccurate slot-based measurements, and the inability to apply outer-loop link adaptation mechanisms, leading to suboptimal link adaptation and channel state information (CSI) reporting.
Innovation Solution
Enhancements to the CSI framework include extended range CQI reporting using 3-4 bit sub-band CQI signaling and multiple CQI tables to provide more precise SINR information, allowing for better representation of the tails of the SINR distribution and improved link adaptation in URLLC scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extended range CQI reporting with 3-4 bit sub-band CQI signaling is implemented, then SINR measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the channel quality reporting into wideband CQI and sub-band CQI components. The sub-band CQI uses differential encoding where only the difference from wideband CQI is reported, segmenting the reporting burden while maintaining precision for URLLC requirements
Solution Approach 2:
The patent extends the CQI reporting range by introducing differential sub-band CQI values that can indicate both improvements and degradations relative to wideband CQI. This dimensional extension allows representation of SINR values beyond the traditional 0-15 range, capturing tail events in SINR distribution
2Measurement precision
If multiple CQI tables are used to represent extended SINR range, then link adaptation accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent introduces dynamic CQI table selection based on higher layer signaling. The gNB can configure which CQI table (first or second) to use based on channel conditions and URLLC requirements, allowing the system to adapt between different SINR ranges dynamically rather than maintaining fixed complexity
Solution Approach 2:
The patent changes the interpretation of CQI values by introducing multiple CQI tables with different mappings. The first CQI table covers traditional SINR ranges while the second CQI table extends to higher SINR values, with the selection between them controlled by differential sub-band CQI indicators
3Measurement precision
If more time is allocated for channel measurement, then CSI accuracy is improved, but latency increases
Solution Approach 1:
The patent performs wideband CQI measurement as a preliminary step that covers the entire bandwidth. This preliminary measurement provides a baseline that reduces the need for extensive sub-band measurements, as sub-band CQI only needs to report differential values from the already-acquired wideband measurement
Solution Approach 2:
The patent uses differential sub-band CQI reporting where only the difference from wideband CQI is measured and reported. This partial measurement approach focuses resources on capturing the most significant variations in channel quality while accepting that absolute sub-band measurements don't need to be as precise as wideband measurements
4Reliability
If outer-loop link adaptation is applied, then reliability is improved, but processing time increases
Solution Approach 1:
The patent pre-configures multiple CQI tables and differential encoding schemes before URLLC transmission. This preliminary configuration allows the gNB to quickly select and apply the appropriate CQI interpretation without performing complex adaptations during the actual URLLC transmission timeline
Solution Approach 2:
The patent implements enhanced feedback mechanisms where the UE reports differential sub-band CQI values that provide the gNB with precise information about channel variations. This rich feedback enables the gNB to make accurate link adaptation decisions with minimal processing time by using pre-computed CQI tables rather than performing iterative optimizations
Data Source
AI summary
Various embodiments herein provide techniques related to CWI for a wideband and one or more sub-bands of the wideband. In embodiments, a user equipment (UE) transmit a wideband channel quality index (CQI) report related to the channel state information (CSI) of the wideband. The UE may further identify, from the set of 2, 3, 4, and 5, a number of bits to use for a sub-band CQI report related to a sub-band of the one or more sub-bands, and transmit a sub-band CQI report based on the identified number of bits. Other embodiments may be described and/or claimed.