Subcarrier Frequency Spacing Adaptation for Energy Efficiency
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Solution Overview
Problem
Existing multi-carrier communication systems face challenges in managing energy efficiency, particularly due to high peak-to-average power ratio (PAPR) of signals, which affects battery life and power consumption in communication devices.
Innovation Solution
The solution involves adjusting the sub-carrier frequency spacing of multi-carrier communication signals based on an energy efficiency indicator provided by communication devices, allowing for adaptive transmission and radio resource management to optimize energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If iterative clipping based approach is used to reduce PAPR, then peak-to-average power ratio is reduced, but processing complexity and processing delay increase
Solution Approach 1:
The patent changes the parameter of subcarrier spacing to control PAPR. By adjusting the subcarrier spacing parameter, the system achieves PAPR reduction without requiring complex iterative clipping processing, thus resolving the contradiction between energy consumption and processing complexity.
2Use of energy by moving object
If iterative clipping based approach is used to reduce PAPR, then peak-to-average power ratio is reduced, but spectrum regrowth increases
Solution Approach 1:
The patent uses subcarrier spacing adjustment to achieve PAPR reduction while avoiding the spectrum regrowth problem that occurs with iterative clipping methods. This parameter-based approach resolves the contradiction between energy consumption and harmful spectral emissions.
3Use of energy by moving object
If filter bank spread and DFT spread based approaches are used to reduce PAPR, then peak-to-average power ratio is reduced, but processing complexity increases
Solution Approach 1:
The patent employs subcarrier spacing parameter adjustment as a simpler alternative to filter bank spread and DFT spread based approaches. This achieves PAPR reduction with lower processing complexity, resolving the technical contradiction.
4Use of energy by moving object
If single carrier filter-bank multi-carrier modulation is used, then peak-to-average power ratio is reduced, but flexibility of communications decreases
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the network entity to adjust subcarrier spacing based on energy efficiency indicators from multiple communication devices. This dynamic parameter adjustment maintains communication flexibility while achieving PAPR reduction, resolving the contradiction between energy consumption and adaptability.
Data Source
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AI summary
The invention relates to a network entity (100) for managing communications of a plurality of communication devices within a communication network, a communication device of the plurality of communication devices being configured to transmit a multi-carrier communication signal comprising a plurality of sub-carriers, and to transmit an energy efficiency indicator indicating an energy efficiency specification of the communication device, the network entity (100) comprising a communication interface (101) being configured to receive the energy efficiency indicator over the communication network, and a processor (103) being configured to determine a sub-carrier frequency spacing of the plurality of sub-carriers upon the basis of the energy efficiency indicator, and to generate a resource block indicator associated with the communication device, wherein the resource block indicator indicates the sub-carrier frequency spacing, wherein the communication interface (101) is further configured to transmit the resource block indicator over the communication network to the communication device.