NB-IoT Downlink Control Information Modulation Scheme Indication
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Solution Overview
Problem
Current NB-IoT technologies face challenges in supporting scheduling based on higher order modulation, particularly in downlink control information, to increase data transmission rates and support higher-speed IoT services.
Innovation Solution
A data transmission method and apparatus that utilize downlink control information (DCI) to indicate the modulation scheme of downlink data, allowing terminal devices to receive data based on the indicated modulation scheme, which can be either a first modulation scheme (such as 8PSK, 16QAM, 64QAM, or 256QAM) or QPSK, depending on repetition quantity or MCS indication information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher order modulation schemes (16QAM, 64QAM) are introduced into NB-IoT to increase data transmission rate, then the data transmission rate is improved, but the complexity of downlink control information scheduling increases
Solution Approach 1:
The patent changes the modulation order parameter from traditional QPSK (modulation order 2) to higher order modulation schemes (16QAM with modulation order 4, 64QAM with modulation order 6). By introducing a modulation order indicator in DCI that can represent different modulation orders, the system enables flexible parameter changes to achieve higher data transmission rates while maintaining scheduling flexibility through DCI-based control
Solution Approach 2:
The patent implements dynamic modulation scheme selection by embedding a modulation order indicator in the downlink control information. This allows the network device to dynamically adjust the modulation order for different downlink data transmissions based on channel conditions and service requirements, transitioning from static to dynamic scheduling to resolve the contradiction between higher transmission rates and scheduling complexity
2Productivity
If higher order modulation schemes are used to support higher-speed IoT services, then the data transmission rate is improved, but the complexity of modulation scheme indication in DCI increases
Solution Approach 1:
The patent introduces a modulation order indicator parameter in DCI that can take different values to represent different modulation orders (e.g., first value for 16QAM, second value for 64QAM). This parameter change approach allows the system to indicate higher order modulation schemes without fundamentally changing the DCI structure, thereby improving data transmission rate while controlling the increase in indication complexity through efficient bit representation
Data Source
AI summary
A data transmission method and an apparatus are provided. The method includes: A terminal device receives downlink control information (DCI) from a network device, where the DCI is used to schedule downlink data and indicate a modulation scheme of the downlink data, the modulation scheme of the downlink data is a first modulation scheme or quadrature phase shift keying (QPSK), and a modulation order corresponding to the first modulation scheme is greater than 2; and the terminal device receives the downlink data based on the modulation scheme. Based on the foregoing procedure, the network device indicates the modulation scheme of the downlink data by using the DCI, so that the terminal device can receive the downlink data based on the modulation scheme indicated by the DCI. In this way, scheduling based on higher order modulation indicated by using the DCI can be implemented.