Dynamic Modulation Switching for NB-IoT Data Rate and Coverage Trade-off
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Solution Overview
Problem
Current NB-IoT communication technologies face limitations in coverage and data transmission rates due to restricted modulation modes and transport block sizes, especially when higher-order modulation modes like 16 QAM are introduced.
Innovation Solution
A communication method and apparatus that dynamically determine and switch between different communication mechanisms based on configuration parameters and modulation orders, allowing for the use of higher-order modulation schemes like 16 QAM when supported by both terminals and network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher-order modulation modes like 16 QAM are introduced to improve data transmission rates, then the transmission rate increases, but the coverage and reliability deteriorate due to higher susceptibility to noise and interference
Solution Approach 1:
The patent implements dynamic modulation adaptation by enabling the system to switch between QPSK and 16 QAM modulation modes based on real-time channel conditions. The terminal and network device negotiate and select the appropriate modulation order, allowing the system to achieve high data rates when channel conditions are good while maintaining reliable coverage when conditions are poor, thus resolving the contradiction between transmission rate and coverage reliability.
Solution Approach 2:
The patent changes the modulation order parameter from fixed QPSK to variable modulation schemes including 16 QAM. By introducing configurable modulation orders (e.g., through parameters like maxModOrder or modulationSchemeIndication), the system can adjust the modulation parameter to match channel quality, achieving high rates in good conditions while maintaining reliability in poor conditions.
2Productivity
If the transport block size table is expanded to support higher modulation orders, then the data transmission capacity increases, but the device complexity increases due to larger tables and more configuration parameters
Solution Approach 1:
The patent segments the transport block size configuration by creating separate tables or configurations for different modulation orders. Instead of one large complex table, the system uses multiple smaller tables (e.g., TBS tables for QPSK and 16 QAM separately), each optimized for its specific modulation mode. This segmentation reduces the complexity of individual tables while maintaining overall high transmission capacity.
Solution Approach 2:
The patent performs preliminary configuration by pre-defining transport block size tables for different modulation orders during system setup or capability negotiation. The terminal and network device exchange capability information in advance, allowing the appropriate TBS table to be selected before actual data transmission begins. This preliminary action avoids the need for complex real-time calculations and reduces operational complexity.
Data Source
AI summary
The present disclosure relates to a communication method, a communication apparatus, and a storage medium. The communication method comprises: determining a communication mechanism applied to the current communication, the communication mechanism including a first communication mechanism or a second communication mechanism, wherein the first communication mechanism and the second communication mechanism have different configuration parameters, and the maximum modulation order supported by a modulation and coding scheme in the second communication mechanism is higher than the maximum modulation order supported by the modulation and coding scheme in the first communication mechanism; and communicating on the basis of the first communication mechanism or the second communication mechanism.