Msg3 Quality Report Design for NB-IoT Downlink Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in downlink transmission efficiency and user equipment (UE) power consumption, particularly in Machine Type Communication (MTC) and Narrowband Internet of Things (NB-IoT) systems, where accurate downlink channel quality reporting is limited by the estimation based on Narrowband Physical Random Access Channel (NPRACH) coverage levels.
Innovation Solution
The design of quality reports in Message 3 (Msg3) for enhanced MTC and NB-IoT systems, which includes specifying quality report metrics, measurement reference resources, and configuration options to enable accurate downlink channel quality reporting, allowing UEs to report Channel Quality Indicators (CQI) or repetition numbers for decoding with a Block Error Rate (BLER) of 1%, enhancing transmission efficiency and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downlink channel quality is estimated based on NPRACH coverage levels, then the estimation process is simple, but the measurement precision is insufficient
Solution Approach 1:
The patent introduces new parameters for quality reporting including CQI (Channel Quality Indicator) and repetition numbers for decoding with specific BLER targets. These parameter changes enable more precise downlink channel quality estimation by moving from coarse NPRACH coverage level estimates to fine-grained CQI measurements and repetition count reports, directly resolving the measurement precision issue while maintaining manageable complexity through standardized parameter definitions
Solution Approach 2:
The patent uses Msg3 as an intermediary carrier to transport quality report information from UE to base station. This intermediary mechanism allows the system to convey detailed channel quality measurements (CQI, repetition numbers) without requiring direct complex measurement procedures, thereby improving measurement precision while keeping the overall system complexity acceptable through the use of existing random access message structures
2Productivity
If accurate downlink channel quality reporting is implemented, then downlink transmission efficiency improves, but UE power consumption increases
Solution Approach 1:
The patent implements partial quality reporting where UEs report only essential channel quality information (CQI and/or repetition numbers) rather than comprehensive channel state information. This partial action approach provides sufficient information to improve downlink transmission efficiency through better resource allocation and modulation and coding scheme selection, while avoiding the excessive power consumption that would result from more comprehensive measurements and reporting
Solution Approach 2:
By changing the reporting parameters to focus on specific metrics (CQI for channel quality, repetition numbers for decoding performance at target BLER), the system achieves improved transmission efficiency through better-adapted resource allocation without requiring continuous or excessive measurement activities, thereby managing UE power consumption more effectively
3Measurement precision
If comprehensive quality report metrics are reported, then resource allocation accuracy improves, but the quantity of information transmitted increases
Solution Approach 1:
The patent extracts only the most critical quality metrics (CQI and repetition numbers) from the full set of possible channel state information and transmits only these essential elements in the quality report. This extraction approach maintains resource allocation accuracy by focusing on the parameters that most directly impact resource allocation decisions, while minimizing the quantity of information transmitted compared to reporting all available channel measurements
Solution Approach 2:
The patent changes the reporting parameters to use compact representations (CQI indices and repetition number counts) rather than transmitting full channel measurement data. This parameter transformation enables accurate resource allocation based on quality metrics while keeping the information transmission volume low through efficient encoding of the essential quality indicators
Data Source
AI summary
Some embodiments of this disclosure include systems, apparatuses, methods, and computer-readable media for use in a wireless network for designing quality report for enhanced Machine Type Communication (EMTC) and Narrowband Internet of Things (NB-IOT). For example, some embodiments are directed to a user equipment (UE) including radio front end circuitry and processor circuitry coupled to the radio front end circuitry. The processor circuitry can be configured to determine a downlink (DL) quality metric based on a DL quality metric type and identify a message 3 (Msg3) signal based on the determined DL quality metric. The processor circuitry can further be configured to transmit, using the radio front end circuitry, the identified Msg3 signal to a base station.