MTC Frame Structure with Adjustable Pulse Bandwidth
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Solution Overview
Problem
Current machine-type communication (MTC) systems face challenges such as massive connections overwhelming LTE networks, high coverage requirements, cost constraints, power consumption limitations, asynchronous transmission burdens, and fixed signal pulse bandwidths, which hinder efficient communication in diverse MTC applications.
Innovation Solution
A frame structure for MTC systems with adjustable pulse bandwidth, allowing for varying sub-frame lengths and signal pulse bandwidths based on coverage levels, enabling efficient resource allocation and energy management, and supporting asynchronous transmissions to accommodate a large number of devices with different communication needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed TTI length and signal pulse bandwidth are used in LTE-based MTC systems, then network synchronization and resource allocation are simplified, but the system cannot accommodate diverse MTC applications with different coverage levels and cannot support a large number of connected devices efficiently
Solution Approach 1:
The frame structure is segmented into multiple sub-frames with different lengths (e.g., 0.5ms, 1ms, 2ms, 4ms, 8ms, 16ms) and each sub-frame can have different signal pulse bandwidths. This segmentation allows the system to allocate appropriate time-frequency resources for different MTC applications and coverage levels without requiring a completely new complex frame structure
Solution Approach 2:
The patent introduces dynamic configurability where the signal pulse bandwidth and sub-frame length can be adjusted based on coverage levels and application requirements. The base station can dynamically select from multiple predefined configurations (e.g., narrowband for remote devices, wider bandwidth for closer devices) to optimize performance for diverse MTC scenarios
2Reliability
If synchronous transmission coordination is implemented, then network synchronization is maintained, but signaling overhead increases and power consumption rises for battery-powered devices
Solution Approach 1:
The patent enables devices to transmit periodically without continuous synchronization coordination. Battery-powered MTC devices can enter sleep mode and wake up at predetermined intervals to transmit data asynchronously, significantly reducing power consumption while maintaining acceptable network operation through periodic uplink transmissions
3Quantity of substance
If the number of connected MTC devices is increased, then more devices can be supported, but the network becomes overwhelmed and existing frame structures cannot accommodate the scale
Solution Approach 1:
The patent introduces an additional dimension of resource allocation by allowing different signal pulse bandwidths within the same time frame. This enables frequency-domain separation of devices at different coverage levels, effectively increasing network capacity to support billions of MTC devices without requiring proportional increases in time resources
Solution Approach 2:
Different regions of the frequency spectrum are allocated with different signal pulse bandwidths based on local requirements. Remote devices with poor coverage use narrower bandwidths for more robust transmission, while devices with better coverage can use wider bandwidths for higher throughput, optimizing overall network efficiency
4Length of stationary object
If narrowband signaling is used for remote devices, then coverage is extended, but throughput is reduced
Solution Approach 1:
The patent applies different signal pulse bandwidths to different coverage levels and device locations. Remote devices operating at higher coverage levels use narrower bandwidths optimized for extended range, while devices closer to the base station use wider bandwidths optimized for higher throughput, allowing each device to operate at optimal performance for its specific conditions
Data Source
AI summary
Methods and systems for a frame structure for machine-type communications (MTC) with adjustable pulse bandwidth are described. In an embodiment, the frame structure is an uplink frame structure that illustrates a representation of a plurality of coverage levels. The coverage levels are associated with a coverage range of a base station. Each coverage level is associated with corresponding sub-frames, and each sub-frame within a coverage level has the same sub-frame length and bandwidth.