Narrowband Sampling Rate Control for Low-Power M2M Communication
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently supporting machine-to-machine (M2M) communication devices due to high processing complexity and power consumption associated with standard sampling rates, which are not suitable for devices requiring narrowband operation.
Innovation Solution
Implementing a reduced sampling rate for M2M devices, along with adjustable cyclic prefix sizes to align timing configurations, and using modified signal processing techniques such as inverse fast Fourier transforms and digital-to-analog conversions, to enable efficient narrowband communication while reducing processing complexity and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard sampling rate is used for M2M devices, then communication reliability is maintained, but processing complexity and power consumption increase significantly
Solution Approach 1:
The patent applies parameter changes by adjusting the sampling rate from the standard high rate to a reduced rate suitable for narrowband M2M devices. This parameter modification allows M2M devices to operate with lower processing complexity and power consumption while maintaining communication reliability through compensating adjustments in cyclic prefix configuration and signal processing techniques.
2Reliability
If standard sampling rate is used for M2M devices, then communication reliability is maintained, but power consumption increases significantly
Solution Approach 1:
The patent modifies the sampling rate parameter to a reduced value for M2M devices, which directly reduces power consumption. The lower sampling rate decreases the computational burden and energy required for signal processing operations while maintaining communication reliability through adjusted cyclic prefix and signal processing configurations.
3Device complexity
If reduced sampling rate is used for M2M devices, then processing complexity and power consumption are reduced, but timing alignment with standard devices becomes challenging
Solution Approach 1:
The patent applies dynamics by making the cyclic prefix configuration adjustable and adaptive based on the sampling rate being used. The system dynamically configures the cyclic prefix length and structure to match the reduced sampling rate, enabling timing alignment between M2M devices operating at reduced sampling rates and standard devices operating at normal sampling rates.
Solution Approach 2:
The patent modifies multiple parameters including sampling rate, cyclic prefix length, and signal processing configuration to achieve timing alignment. By coordinating changes across these parameters, the system maintains synchronization and timing compatibility between devices operating at different sampling rates within the same wireless network.
4Device complexity
If reduced sampling rate is used for M2M devices, then processing complexity and power consumption are reduced, but signal processing compatibility becomes challenging
Solution Approach 1:
The patent applies segmentation by separating signal processing into distinct stages with different sampling rates. The system processes signals at reduced sampling rate for M2M devices in specific processing stages while maintaining compatibility with standard devices through appropriate interface and conversion mechanisms, allowing each segment to operate optimally for its intended purpose.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless device may use a sampling rate that is less than a default sampling rate associated with a wireless carrier. The device may operate in a narrowband portion of a system bandwidth, and the sampling rate may be less than that used by devices monitoring the whole bandwidth. Multiple sampling rates may be used so that a portion of signal processing may be associated with one sampling rate and another portion of the signal processing may be associated with another sampling rate. The size of a cyclic prefix (CP) may be adjusted based on the sampling rate to align subframe timing boundaries for signals of different sampling rates. In some cases, each symbol of a signal may include both a CP and a postfix such that the postfix for each symbol overlaps the prefix of the next symbol.