Telecom Network Access Filtering for Congestion Management
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Solution Overview
Problem
Access Class Barring in telecommunications networks is inefficient in emergency situations, leading to high congestion and wasted resources, as it restricts public access based solely on access classes without considering the current network load or priority levels, resulting in a low success rate for subscriber-to-subscriber communications and unnecessary resource usage.
Innovation Solution
Implementing a network filtering procedure that considers the current load capacity of base stations, priority levels of mobile terminals, and paging area characteristics to decide whether to transmit communication setup messages, allowing more optimal use of signaling resources and prioritizing emergency services while allowing limited public access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Access Class Barring is implemented to restrict public usage, then high priority users can get through, but the probability of successful subscriber-to-subscriber communication drops to 25%
Solution Approach 1:
The system dynamically changes the access class parameters based on communication type. For emergency calls, it temporarily modifies the access class status to allow both parties to communicate even if one is in a restricted cell. This parameter change enables the network to adapt to different communication scenarios and improve success rates without permanently compromising network management.
Solution Approach 2:
The network element acts as an intermediary that receives communication setup requests and determines whether to apply access restrictions. It mediates between the initiating terminal and the terminating cell, making intelligent decisions about whether to allow communication based on the specific scenario, thereby improving communication success while maintaining overall network control.
2Reliability
If Access Class Barring restricts public access in restricted cells, then emergency services are prioritized, but signaling resources are wasted on unsuccessful paging attempts
Solution Approach 1:
The network element performs preliminary filtering of communication setup requests before they reach the restricted cell. It proactively determines whether a communication should be allowed based on the initiating terminal's access class and the communication type, preventing wasted paging attempts before they occur. This preliminary action saves signaling resources while maintaining emergency service priority.
Solution Approach 2:
The system uses feedback about the communication setup request details (initiating terminal's access class, communication type) to make intelligent decisions. This feedback mechanism allows the network to distinguish between emergency calls that should be permitted and regular calls that should be restricted, optimizing resource usage while maintaining service quality.
3Productivity
If strict Access Class Barring is applied, then network congestion is managed, but the ability of the general public to communicate in emergencies is reduced
Solution Approach 1:
The access restriction system is made dynamic rather than static. The network element can adaptively adjust access decisions based on real-time conditions, communication type, and terminal characteristics. This dynamic approach allows the system to maintain congestion management while providing flexible access for legitimate emergency communications, improving public communication ability without compromising network control.
Data Source
AI summary
A system and method for restricting public access to a mobile telecommunications network in order to prevent congestion. The system and method are particularly useful in situations where the number of end users exceeds, or is likely to exceed, network capacity, for example in emergency situations or for large public gatherings, such as sporting events or New Years Eve celebrations. The system and method disclosed uses filtering by network elements, such as the base stations and MSCs. In particular the system and method can filter low data messages, such as SMS, from more demanding services, such as voice calls, so that all low data messages are transmitted, while the more demanding services are terminated, unless special conditions are met.