Dynamic Scheduling Gap Determination in NB-IoT Systems
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Solution Overview
Problem
The NarrowBand Internet of Things (NB-IoT) systems face challenges in determining the scheduling timing and scheduling gap, leading to collisions of traffic channels due to the use of fixed scheduling gaps, which results in inefficient resource allocation and congestion.
Innovation Solution
A method and apparatus for determining the scheduling gap by demodulating the NarrowBand Physical Downlink Control Channel (NB-PDCCH) to identify the initial subframe of the NarrowBand Downlink Shared Channel (NB-PDSCH) or NarrowBand Physical Uplink Shared Channel (NB-PUSCH, using the final subframe of the NB-PDCCH, resource allocation within the scheduling window, and scheduling gap indication, with options for fixed or dynamic scheduling gap configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed scheduling gap is used in NB-IoT systems, then scheduling simplicity is maintained, but traffic channel collisions occur between different terminals
Solution Approach 1:
The patent applies dynamics by transitioning from fixed scheduling gaps to dynamic scheduling gap determination. The base station determines scheduling gaps adaptively based on terminal-specific factors including processing capabilities, channel conditions, and traffic patterns. This allows the scheduling mechanism to adjust in real-time to avoid collisions while maintaining operational simplicity through automated decision-making algorithms.
Solution Approach 2:
The patent implements parameter changes by modifying the scheduling gap parameter from a static fixed value to a dynamic variable. The scheduling gap is adjusted based on multiple parameters including terminal processing capability, channel quality indicators, traffic type, and system load conditions. This enables the system to optimize resource allocation by changing the timing parameter adaptively rather than using a universal fixed gap.
2Reliability
If NB-PDCCH occupies multiple subframes in time domain, then control channel coverage is improved, but scheduling timing determination becomes complex
Solution Approach 1:
The patent applies segmentation by dividing the multi-subframe NB-PDCCH transmission into distinct segments with clear boundaries. Each segment is associated with specific scheduling information and timing relationships. The base station segments the control channel transmissions and assigns different scheduling gap values to different segments based on their position and content, making timing determination more manageable despite the extended time domain occupation.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of explicit timing indication fields within the DCI format. These intermediary indicators act as mediators between the multi-subframe NB-PDCCH structure and the uplink/downlink scheduling decisions. The timing indicators provide clear reference points that simplify the determination process by translating the complex multi-subframe structure into actionable scheduling timing information.
3Productivity
If scheduling gap is optimized for each terminal, then resource allocation efficiency improves, but system complexity increases
Solution Approach 1:
The patent implements self-service by enabling terminals to autonomously determine their own scheduling gaps based on pre-configured parameters and real-time channel conditions. Each terminal uses its processing capability information, channel quality measurements, and traffic characteristics to calculate appropriate scheduling gaps without requiring complex centralized computation. This distributes the computational burden and reduces overall system complexity while maintaining efficient resource allocation.
Solution Approach 2:
The patent employs feedback mechanisms where terminals report their processing capability, channel conditions, and scheduling performance to the base station. The base station uses this feedback information to adjust and optimize scheduling gap assignments for each terminal. This closed-loop feedback system enables continuous improvement of resource allocation efficiency while keeping the determination process manageable through iterative optimization rather than complex upfront calculations.
Data Source
AI summary
The present invention provides a method and apparatus for determining a scheduling gap, wherein, the method comprises: demodulating the NarrowBand Physical Downlink Control Channel in order to determine the initial subframe of the scheduled NarrowBand Physical Downlink Shared Channel (NB-PDSCH) or the NarrowBand Physical Uplink Shared Channel (NB-PUSCH), wherein, the basis for determining the initial subframe comprises at least one of the following: the final subframe of the NB-PDCCH, the final subframe in the search space where the NB-PDCCH is located, the resource allocation within the scheduling window, and the scheduling gap indication. The implementation of the present technical solutions solves the problem of how to determine the scheduling within the NarrowBand system, thereby saving indication expenditure and improving resource usage efficiency.