Availability and Maintainability Analysis for Mobile Networks in Addis Ababa
| dc.contributor.advisor | Yalemzewd, Negash (PhD) | |
| dc.contributor.author | Leake, Gebrekidan | |
| dc.date.accessioned | 2018-12-21T09:37:19Z | |
| dc.date.accessioned | 2023-11-04T15:13:06Z | |
| dc.date.available | 2018-12-21T09:37:19Z | |
| dc.date.available | 2023-11-04T15:13:06Z | |
| dc.date.issued | 2018-11 | |
| dc.description.abstract | Modern society has a high dependence on communication technology with a wider range of applications. So, service users demand an always available network to use it whenever they wish. Thus, network operators are expected to continuously analyze the performance of their networks and take corrective actions to make them as available as possible. Reliability Engineering provides methodologies and techniques to analyze the reliability, availability, and maintainability (RAM) of systems including telecommunication networks. The main objective of this research is to perform availability, maintainability, and downtime impact analysis as a case study of Ethio telecom (ET) mobile sites deployed in Addis Ababa, Ethiopia. Four months mobile sites outage, active 3G mobile service users and average revenue per user (ARPU) data are used for the analysis. The mean time between failures (MTBF) and the mean time to repair (MTTR) are metrics used for availability analysis while maintainability is analyzed based on the lognormal distribution of the time to repair (TTR) data. Analysis results have shown that: (a) 91.7% of the mobile sites had an outage over four months. (b) 69% of the total mobile sites were in an outage for 114, 592 times and 25, 676.72 hours (c) The average availability of the mobile sites is 99.75% with a median, mean, and maximum maintenance times of 1.9, 3.3 & 10.4 hours respectively. (d) Longer downtimes have a significant impact on revenue, Service Level Agreement (SLA) and on customers. The results of the research can be used as an input in network maintenance policy, strategy, and resource planning to ensure high network availability. The MATLAB, Easy Fit, and MS Excel software tools are used for analysis. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/15240 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | AAU | en_US |
| dc.subject | Availability | en_US |
| dc.subject | Reliability | en_US |
| dc.subject | Maintainability | en_US |
| dc.subject | RAM | en_US |
| dc.subject | Mobile Networks | en_US |
| dc.subject | Network Outage | en_US |
| dc.title | Availability and Maintainability Analysis for Mobile Networks in Addis Ababa | en_US |
| dc.type | Thesis | en_US |