OPERATIONS SUPPORT SYSTEMS, IMPLICATION OF SOFTWARE ERRORS IN GSM NETWORK PERFORMANCE
OPERATIONS SUPPORT SYSTEMS, IMPLICATION OF SOFTWARE ERRORS IN GSM NETWORK PERFORMANCE
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Date
2012-03
Authors
OTORI, ABDULAZIZ UYE
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Abstract
One of the most important requirements to be addressed by a general purpose Fault Management
(FM) system is the ability to quickly identify the root cause of network errors and fix them as
soon as possible. This informs the maintenance of an accurate model of the mobile network error
logs for the FM task and the faults dynamic feature trend/statistical analysis of the error-log
message summary for both the Base Station Subsystems and Mobile Switching Centers by
comparing the relationship between the twin parameters of Frequency of Occurrence and the
Mean Time to Repair each fault type. The Fault Trend Analysis shows that as the numbers of
times a particular fault type occur increases the Mean Time to Repair such faults decreases, with
some deviation from this trend in some cases when we classified them as high priority faults with
serious impact on network performance and those that have little or no impact on network
performance. Filtering and Correlation are two methods we used to simplify the separation of the
principal alarms and redundant alarms from their side effect on network performance. These
algorithms are also presented: Bayesian Inference Technique and Intelligent Management
Information Base (I-MIB) MATLAB Simulation, which enabled us to systematically combine
the qualitative and quantitative aspects of the Bayesian model for network fault management
analysis and to reduce total computational complexity by providing a database of software alarm
parameters respectively. These resulted in a Global Bayesian Network which helps to represent
causal chains, i.e. links between cause/effect relationships to provide the evidence of past events
and show the most likely future causes and their symptoms by computing Conditional
Probabilities of each Symptoms given a particular cause i.e. using the expression P(S= Si,j / C=
Ck ) to populate the Conditional Probability Table. This is critical and useful for effective Global
Systems for Mobile Communications/General Packet Radio Service (GSM/GPRS) Fault
Management Systems and could be deployed by Service providers for quick and proper
diagnosis/troubleshooting of network event/alarm error-logs to help reduce the total downtime
and improved quality of service.
Description
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
AHMADU BELLO UNIVERSITY, ZARIA
NIGERIA
Keywords
OPERATIONS,, SUPPORT,, SYSTEMS,, IMPLICATION,, SOFTWARE,, ERRORS,, GSM,, ETWORK,, PERFORMANCE,, CASE,, STUDY,, Airtel,, NETWORK