NB-IoT Downlink Power Allocation for 16 QAM Modulation
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Solution Overview
Problem
Current NB-IoT systems face challenges in downlink power allocation for 16 QAM modulation, particularly in supporting both anchor and non-anchor carriers, with existing methods lacking standardized data-to-pilot power ratios and signaling aspects for different deployment modes.
Innovation Solution
The proposed solution involves transmitting data-to-pilot power ratio information specific to deployment modes, such as Stand-alone, Guard-band, and In-band deployments, to determine the Narrowband Physical Downlink Shared Channel (NPDSCH) energy per resource element (EPRE) at network nodes and terminal devices, ensuring accurate power allocation for 16 QAM modulation in NB-IoT systems, including both anchor and non-anchor carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 16 QAM modulation is introduced in NB-IoT downlink, then data transmission rate and capacity are improved, but power allocation complexity and system compatibility challenges increase
Solution Approach 1:
The patent introduces new parameters (data-to-pilot power ratios specific to 16 QAM) to replace or supplement existing power allocation parameters. By changing the parameter set used for power allocation, the system can support 16 QAM modulation while maintaining a structured approach to power distribution across different deployment modes.
Solution Approach 2:
The patent segments power allocation into different scenarios based on deployment modes (Stand-alone, Guard-band, In-band) and carrier types (anchor, non-anchor). Each segment has specific data-to-pilot power ratio configurations, allowing tailored power allocation for 16 QAM without overwhelming system-wide complexity.
2Adaptability or versatility
If 16 QAM modulation is supported across all deployment modes, then system versatility is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent applies different data-to-pilot power ratio configurations locally to specific deployment modes and carrier types. Instead of a universal configuration, each deployment mode (Stand-alone, Guard-band, In-band) and carrier type (anchor, non-anchor) has optimized power ratio settings, reducing unnecessary signaling overhead while maintaining versatility.
Solution Approach 2:
The patent enables dynamic selection of power allocation parameters based on the actual deployment mode and carrier type in use. The system can adaptively choose the appropriate data-to-pilot power ratio configuration from multiple predefined options, allowing versatile support for 16 QAM across different scenarios without requiring all configurations to be signaled simultaneously.
Data Source
AI summary
Various embodiments of the present disclosure provide methods and apparatuses for 16 Quadrature Amplitude Modulation (QAM) modulation scheme in a Narrowband Internet of Things (NB-IoT) system. The method implemented at a network node in the NB-IoT system includes transmitting downlink power allocation for 16 QAM modulation scheme to a terminal device in the NB-IoT system, wherein the downlink power allocation indicates data-to-pilot power ratio information to be used for determining Narrowband Physical Downlink Shared Channel (NPDSCH) energy per resource element (EPRE).