NB-IoT DRX Paging With UE-Specific Cycles for Lower Latency
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Solution Overview
Problem
Existing NB-loT systems struggle to provide reduced latency for devices in good coverage while maintaining compatibility with legacy systems and avoiding increased power consumption and resource congestion.
Innovation Solution
Introduction of UE-specific DRX cycles with shorter durations for devices in good coverage, along with separate carrier mappings and configurations to optimize resource allocation and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single long DRX cycle is used for all NB-loT devices, then energy efficiency is improved for devices in bad coverage, but latency increases for devices in good coverage requiring reduced latency services
Solution Approach 1:
The patent segments the NB-loT device population into two groups: devices in bad coverage using a long DRX cycle for energy efficiency, and devices in good coverage using a short DRX cycle for reduced latency. This segmentation allows each group to operate with optimized DRX parameters suited to their specific requirements, resolving the contradiction between energy efficiency and latency.
Solution Approach 2:
The patent introduces dynamic DRX cycle configuration where the network can assign different DRX cycle lengths to different UEs based on their coverage conditions and service requirements. This dynamic adaptation allows the system to switch between long and short DRX cycles, enabling devices to transition between energy-saving mode and low-latency mode as needed.
2Loss of time
If UE-specific short DRX cycles are introduced for devices in good coverage, then latency is reduced, but system complexity increases due to multiple DRX configurations
Solution Approach 1:
The patent applies local quality by introducing UE-specific DRX configurations only where needed (for devices in good coverage requiring reduced latency services), while maintaining the standard long DRX cycle for devices in bad coverage. This localized application of short DRX cycles minimizes the impact on overall system complexity while achieving latency reduction for specific device groups.
3Productivity
If separate paging carriers are used for short DRX UEs, then resource allocation is optimized and interference is minimized, but device complexity increases
Solution Approach 1:
The patent introduces a new dimension for resource allocation by assigning different paging carriers to short DRX UEs versus standard UEs. This dimensional separation in the frequency domain allows the system to optimize resource allocation and minimize interference between the two device groups, while the complexity increase is managed through standardized carrier configuration procedures.
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AI summary
NB-IoT offers a communication standard for IoT devices in a cellular network. Techniques for providing efficient spectrum management and timely paging of NB-IoT devices are disclosed, including specific DRX cycles for sets of devices in good coverage which require lower latency paging than provided by standard DRX cycles.