QoS Performance Evaluation of RWA Algorithms under Different Resilience Mechanisms: in the Case of EthioTelecom Backbone Network
| dc.contributor.advisor | Yalemzewd, Negash (PhD) | |
| dc.contributor.author | Kedir, Yassin | |
| dc.date.accessioned | 2020-03-09T06:19:08Z | |
| dc.date.accessioned | 2023-11-04T15:13:12Z | |
| dc.date.available | 2020-03-09T06:19:08Z | |
| dc.date.available | 2023-11-04T15:13:12Z | |
| dc.date.issued | 2019-12 | |
| dc.description.abstract | For the past decades, data traffic demand considerably increased in volume and quality due to the advent of capable end-user devices and innovative data services. To accommodate the highly increasing data traffic volume and customer demand for service with better quality, an automatic switched optical network (ASON) with different routing and wavelength assignment (RWA) algorithms and resilience mechanisms are used. Previously different researchers evaluated performance of different resilience mechanisms and RWA algorithms separately by considering an ideal highly connected network with ideal uniform traffic demand/connection request. This issue can force telecom operators including Ethio-telecom to implement their backbone network based on vendor recommendation. In this thesis, first, performance of four adaptive RWA algorithms was evaluated considering blocking probability and average throughput as QoS metrics under different three resilience mechanisms considering a practical Ethio-telecom north circle backbone network topology and its traffic demand scenario. Secondly, performance of the three resilience mechanisms was evaluated under routing algorithm selected from routing algorithm evaluation considering blocking probability, recoverability and average network throughput as QoS performance metrics. Finally, network topology connectivity degree effect on the performance of 1+1 DPP and restoration resilience mechanisms was evaluated by randomly adding 30 unidirectional links to the reference network topology used in the above evaluations. To evaluate the RWA algorithms and resilience mechanisms, Net2Plan simulator is used. The result of the evaluations shows that, at low connected network topology, restoration with alternate routing has on average 40 % lower blocking probability, higher average throughput and lower recoverability as compared to the other resilience mechanisms combined with alternate routing. An increase in network connectivity by 0.9 decreases the blocking probability and average throughput advantage of restoration by 10%. So considering the possibility of improving the recoverability of the network by preparing a pool of restoration path prior to fault occurrence and its ability to protect against double link failure (DLF), restoration with alternate routing becomes more recommended for low connected network topologies at low traffic load. But for highly connected network topologies with high traffic load using either 1+1 DPP or hybrid becomes more recommended based on the need for DLF protection. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/21053 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Network Resiliency | en_US |
| dc.subject | QoS | en_US |
| dc.subject | Recovery | en_US |
| dc.subject | Resource Utilization | en_US |
| dc.subject | RWA | en_US |
| dc.subject | Survivability | en_US |
| dc.title | QoS Performance Evaluation of RWA Algorithms under Different Resilience Mechanisms: in the Case of EthioTelecom Backbone Network | en_US |
| dc.type | Thesis | en_US |