NBIoT Downlink Power Allocation for Consistent Symbol Levels
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Solution Overview
Problem
The existing downlink power allocation methods for LTE are not directly applicable to NBIoT due to differences in symbol types and bandwidth configurations, leading to challenges in achieving optimal power efficiency and accurate Automatic Gain Control (AGC) in NBIoT systems.
Innovation Solution
The proposed method involves configuring the transmission powers of NBIoT downlink REs, specifically the NPDSCH, NRS, and CRS REs, using power ratios (ρA, ρB, ρC) determined by higher layer parameters and antenna port configurations, to ensure consistent power levels across symbols and improve power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LTE downlink power allocation methods are directly applied to NBIoT, then implementation simplicity is maintained, but power efficiency and AGC accuracy deteriorate due to differences in symbol types and bandwidth configurations
Solution Approach 1:
The patent applies local quality by configuring different power ratios (ρA, ρB, ρC) for different types of resource elements (NPDSCH, NRS, CRS) based on their specific characteristics and symbol types. This allows each RE type to receive appropriate power allocation tailored to its function, improving overall power efficiency while maintaining implementation feasibility through structured configuration.
Solution Approach 2:
The patent changes the power allocation parameters by introducing multiple power ratios (ρA for NPDSCH in Type A symbols, ρB for NPDSCH in Type B symbols, ρC for CRS) that can be independently configured. This parameter differentiation enables optimized power distribution across various RE types and symbol configurations, resolving the power efficiency issue while keeping the implementation systematic.
2Ease of manufacture
If LTE downlink power allocation methods are directly applied to NBIoT, then implementation simplicity is maintained, but AGC accuracy deteriorates due to inconsistent power levels across symbols
Solution Approach 1:
The patent ensures local quality by assigning specific power ratios to different symbol types (Type A and Type B) and resource element types (NPDSCH, NRS, CRS). This localized power configuration ensures that each symbol type maintains consistent power levels appropriate for its content, enabling accurate AGC operation while preserving implementation simplicity through structured power management.
Solution Approach 2:
The patent applies equipotentiality by configuring power ratios such that the total power across different symbol types becomes balanced and consistent. By carefully setting ρA, ρB, and ρC values, the system achieves uniform power distribution across symbols, which is essential for accurate AGC measurement while maintaining a relatively simple implementation framework.
3Loss of energy
If different power ratios are configured for different RE types, then power efficiency is improved, but system complexity increases
Solution Approach 1:
The patent achieves universality by creating a unified power allocation framework that handles multiple RE types (NPDSCH, NRS, CRS) and multiple symbol types (Type A, Type B) through a consistent set of power ratio parameters (ρA, ρB, ρC). This universal approach improves power efficiency across all RE types while avoiding the need for separate complex configuration mechanisms for each RE type, thus limiting the increase in system complexity.
Solution Approach 2:
The patent introduces dynamics by allowing the power ratios (ρA, ρB, ρC) to be flexibly configured based on different deployment scenarios, bandwidth configurations, and symbol types. This dynamic configuration capability enables optimized power efficiency for varying conditions while maintaining a relatively simple base framework that adapts rather than requiring fundamentally different mechanisms for each scenario.
Data Source
AI summary
Methods and apparatuses for downlink power allocation for NBIoT are disclosed. A method comprises receiving a first reference signal (NRS), a first data and a second data, wherein the first reference signal is associated with a first transmission power (E_NRS); the first data is in a symbol without the first reference signal, and the first data is associated with a second transmission power (E_A); and the second data is in a symbol in which the first reference signal is received; and the second data is associated with a third transmission power (E_B).