NB-IoT Access Control for Exceptional Data Priority
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Solution Overview
Problem
Current mobile communication systems face network overload and congestion issues, particularly exacerbated by machine-type communication (MTC) devices, where access control mechanisms like access class barring (ACB) and extended access barring (EAB) are not effectively differentiated for urgent data transmissions in Narrowband-IoT (NB-IoT) environments, leading to network resource waste and degraded user experience.
Innovation Solution
A method and device for network access control in NB-IoT systems that differentiate between normal and exceptional data transmissions by using specific radio access technology (RAT) indicators and access barring information, allowing urgent data to bypass access barring checks, ensuring priority access for exceptional data while managing network congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If access barring checks are applied to all data transmissions in NB-IoT networks, then network congestion is reduced, but urgent/exceptional data transmissions are delayed or blocked
Solution Approach 1:
The patent segments data transmissions into two categories: normal data and exceptional/urgent data. This segmentation allows different access control mechanisms to be applied to different data types, enabling urgent data to bypass access barring checks while normal data undergoes standard congestion management procedures.
Solution Approach 2:
The patent applies different quality characteristics to different data transmissions by introducing an indicator that identifies exceptional data. This local differentiation enables the network to apply lenient access control to urgent data while maintaining strict control for normal data, ensuring that time-critical transmissions are not blocked during congestion.
2Device complexity
If access class barring and extended access barring are not differentiated for MTC devices, then device simplicity is maintained, but network resource efficiency deteriorates
Solution Approach 1:
The patent implements preliminary action by having the network pre-configure an indicator in the UE that identifies when data is exceptional or urgent. This pre-configuration enables the UE to automatically differentiate and handle urgent data transmissions without complex real-time decisions, improving network resource efficiency while maintaining device simplicity.
3Device complexity
If all data transmissions are treated equally in NB-IoT access control, then system simplicity is maintained, but user experience for urgent communications deteriorates
Solution Approach 1:
The patent changes the parameter of data identification by introducing an indicator that distinguishes exceptional data from normal data. This parameter change enables the system to maintain simplicity in the overall access control mechanism while providing priority treatment to urgent communications through the differentiated indicator.
Data Source
AI summary
Provided in one disclosure of the present specification is a method for a wireless device attempting network access. The method may comprise the steps of: an RRC layer of the wireless device receiving, from a cell, a first piece of information relating to an NB-IoT RAT; the RRC layer receiving, from the cell, a second piece of information indicating whether to block access to exception data; the RRC layer obtaining, from an upper layer, an RRC establishment cause set as outgoing exception data, when an NAS signaling process is initiated to transmit the exception data; and performing an access block inspection.