Communication Network Subcarrier Partitioning for M2M Energy Efficiency
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Solution Overview
Problem
Modern communication networks face challenges in supporting both conventional and energy-limited M2M nodes using the same spectral resources, as existing systems are not energy-efficient and fail to meet the low-data-rate, low-priority requirements of M2M communication.
Innovation Solution
The network groups operating nodes by complexity and uses multi-carrier modulation with partitioned frequency bands, allowing only a subset of subcarriers for data reconstruction through sub-sampling, reducing the complexity of analog-to-digital conversion and Fast-Fourier-Transform processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional systems use full spectral resources for all nodes, then data rate is maintained, but energy consumption increases significantly for energy-limited M2M nodes
Solution Approach 1:
The frequency band is segmented into multiple classes (K classes) where each class uses a different number of subcarriers (Mk subcarriers). Energy-limited M2M nodes are assigned to classes with fewer subcarriers, reducing their energy consumption, while conventional nodes can use classes with more subcarriers to maintain high data rates. This segmentation allows differential resource allocation based on node capabilities.
Solution Approach 2:
Different receiver classes are assigned different local qualities in terms of spectral resource allocation. Each receiver class k is configured to use Mk inner-most subcarriers around the carrier frequency, creating local quality differences that match the energy and capability characteristics of different node types. This allows each node to operate at an optimal point on the energy-performance tradeoff curve.
2Reliability
If systems are designed to support mobile terminals with high data rates, then communication performance is improved, but complexity and energy consumption increase for low-priority M2M communication
Solution Approach 1:
The system dynamically adapts the receiver configuration based on the node type and service requirements. Receiver classes are defined with different numbers of subcarriers (Mk) that can be dynamically assigned to different nodes. This dynamic adaptation allows the system to match receiver complexity to the actual communication needs, avoiding over-provisioning for M2M nodes while maintaining high performance for mobile terminals.
Solution Approach 2:
The system changes key parameters such as the number of subcarriers (Mk), sampling rate, and FFT size based on the receiver class. By adjusting these parameters according to node capabilities, the system reduces complexity for M2M nodes while maintaining appropriate communication performance. The parameter changes are coordinated between transmitter and receiver to ensure proper signal processing.
3Reliability
If separate spectral resources are allocated for M2M and conventional communication, then service quality is improved, but resource utilization efficiency decreases
Solution Approach 1:
The same spectral resources are made universal by allowing different receiver classes to share the frequency band. The system supports both M2M and conventional communication services using the same physical spectrum, with resource allocation dynamically adjusted based on service type and node capabilities. This multi-functionality approach improves spectral efficiency while maintaining service quality through differentiated resource assignment.
Solution Approach 2:
M2M nodes perform partial action by using only Mk subcarriers (a subset of the total N subcarriers) around the carrier frequency. This partial utilization of spectral resources is sufficient for low-data-rate M2M applications and reduces energy consumption. Conventional nodes can use more subcarriers when needed, creating a flexible resource allocation that improves overall spectral efficiency.
Data Source
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AI summary
A communication network, wherein said network includes a plurality of communication elements that function as transmitters and/or receivers, in particular base stations and operating nodes being associated to at least one of said base stations, wherein the communication between said transmitters and said receivers is performed by way of generating and transmitting signals based on a multi-carrier modulation with a number of N subcarriers around a carrier frequency fc, said number of subcarriers can be negotiated for each receiver individually and is preferably a power of two.