NB-IoT Downlink Quality Reporting via MSG3 for Accurate RSRP Scheduling
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Solution Overview
Problem
The existing NB-IoT system inaccurately determines the RSRP decision threshold for scheduling due to reliance on uplink interference status alone, leading to inefficient resource utilization and communication failures.
Innovation Solution
The terminal device sends downlink channel quality information in MSG3 to the network device, allowing the network device to consider both uplink and downlink channel conditions for more accurate RSRP decision threshold determination, thereby optimizing scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station determines the RSRP decision threshold based only on uplink interference status, then the determination process is simple, but the accuracy of the RSRP decision threshold is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device measures downlink channel quality (RSRP/RSRQ/SINR) and reports this information back to the base station. The base station uses this feedback to dynamically adjust the RSRP decision threshold, transforming a static determination process into an adaptive one that continuously optimizes threshold accuracy based on actual channel conditions.
Solution Approach 2:
The terminal device performs downlink channel quality measurement and reports this information to the base station before the base station makes scheduling decisions. This preliminary action provides the base station with advance knowledge of downlink channel conditions, enabling more accurate RSRP decision threshold determination prior to resource allocation.
2Device complexity
If the base station uses only uplink interference status for scheduling, then the scheduling process is simple, but the resource utilization is inefficient
Solution Approach 1:
The patent establishes a feedback loop where terminal devices report downlink channel quality measurements to the base station. The base station incorporates this feedback into its scheduling decisions, adjusting resource allocation based on actual downlink channel conditions rather than relying solely on uplink interference status, thereby improving resource utilization efficiency.
Solution Approach 2:
The base station dynamically changes scheduling parameters (such as RSRP decision threshold, resource block allocation, modulation and coding schemes) based on reported downlink channel quality parameters. This allows the scheduling process to adapt to varying channel conditions, optimizing resource utilization for different terminal devices in different coverage scenarios.
3Measurement precision
If the RSRP decision threshold is determined inaccurately, then the base station cannot perform accurate scheduling, but obtaining more information increases system complexity
Solution Approach 1:
The terminal device autonomously performs downlink channel quality measurements and generates reports based on its own measurements of reference signals. This self-service approach allows the terminal to provide accurate channel condition information without requiring complex network-side measurement infrastructure, balancing measurement accuracy with system complexity.
Solution Approach 2:
The patent uses downlink reference signals as an intermediary carrier to convey channel quality information. Instead of directly measuring and reporting complex channel state information, the terminal measures the quality of transmitted reference signals, which serve as intermediaries to infer overall downlink channel conditions. This simplifies the information exchange process while maintaining measurement accuracy.
Data Source
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AI summary
An information sending method, an information receiving method, and an apparatus are provided, to improve scheduling accuracy for a terminal device. The information sending method includes: generating a downlink channel quality report volume, where the downlink channel quality report volume is used to indicate a relative relationship between a first number of repetitions and a second number of repetitions, the first number of repetitions is a quantity of retransmissions that need to be performed in a preset downlink control channel format to achieve a preset block error rate, and the second number of repetitions is a number of repetitions corresponding to common search space of a downlink control channel carried on a downlink carrier; and sending an MSG3 to a network device in a random access procedure, where the MSG3 is used to indicate the downlink channel quality report volume.