Extended Access Barring for MTC Device Network Congestion
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Solution Overview
Problem
In LTE systems, Machine Type Communication (MTC) devices face access overload issues when multiple User Equipments (UEs) simultaneously attempt to access the network, leading to inefficient resource management and potential access barriers due to the need for initial access request messages.
Innovation Solution
A system and method that allow MTC devices to determine network access eligibility before transmitting access request messages, employing Access Class Barring (ACB) and Extended Access Barring (EAB) mechanisms to manage access attempts, particularly by distinguishing between different types of access requests and employing appropriate barring procedures to prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MTC devices transmit access request messages at the initial stage to access the network, then the network can process access requests, but access overload occurs when multiple UEs simultaneously transmit access requests
Solution Approach 1:
The patent applies preliminary action by implementing access class barring checks before MTC devices transmit access request messages. The network configures barring parameters in advance, and devices perform eligibility assessment prior to access attempts, preventing overload before it occurs rather than handling it after simultaneous requests are transmitted
Solution Approach 2:
The patent implements preliminary anti-action by using access class barring mechanisms that prevent unauthorized or excessive access attempts before they can contribute to network overload. The barring parameters and checks are established in advance to counteract potential access congestion, stopping problematic access patterns before they degrade network productivity
2Productivity
If access class barring mechanisms are implemented to prevent access overload, then network congestion is reduced, but access control complexity increases
Solution Approach 1:
The patent applies segmentation by dividing access control into distinct access classes (AC 0-15) with different barring parameters. This segmentation allows the system to manage different types of MTC traffic separately, applying appropriate barring strategies to each class while maintaining overall network efficiency without requiring a single complex universal control mechanism
Solution Approach 2:
The patent implements parameter changes by configuring different barring factors, barring times, and probability thresholds for different access classes. These adjustable parameters allow the network to dynamically control access based on traffic conditions and priority levels, managing complexity through configurable parameters rather than rigid structural changes
3Productivity
If MTC devices perform access class barring checks before transmitting access requests, then access overload is reduced, but access delay increases for legitimate devices
Solution Approach 1:
The patent applies local quality by applying different barring strictness levels to different access classes based on their priority and service requirements. High-priority access classes experience minimal or no barring delays, while lower-priority classes undergo more stringent checks. This localized differentiation reduces overall access delay for critical services while maintaining overload protection for less time-sensitive traffic
Data Source
AI summary
A system and a method that employs Extended Access Barring (EAB) when a Machine Type Communication (MTC) device performs an attempt to access an evolved Node B (eNB) in a wireless communication system are provided. When User Equipment (UE) supporting MTC, an MTC device, performs an attempt to access a network, the system and method determines whether it can access the network and performs the access procedure. The system and method can control the operations of UE that performs an attempt to access a network, thereby preventing excessive access.