Performance evaluation of QOS for VOIP in MPLS and diffserv environment | |
| Author | Vu Tuan Son |
| Call Number | AIT RSPR no. TC-03-28 |
| Subject(s) | Internet telephony Computer network protocols |
| Note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. TC-03-28 |
| Abstract | IP network with its connectionless nature provides best effort service; and serves most users well enough. It is because of retransmission incorrect or loss data and even latency does not cause bad effect in terms of delay. Voice over IP (VoIP) is the technology used to transmit voice over an IP network. However, VoIP is time-sensitive, interactive application, which needs hard quality of service (QoS) or stringent bounds on end-to-end packet delay, jitter, and loss. MPLS and DiffServ are considered as a solution for the provisioning of end-to-end QoS. MPLS can support voice better due to its connection-oriented feature allows to forward packets along predefined paths. Meanwhile, DiffServ offers QoS classes, and supports priorities of traffic aggregates; packets are classified & marked at network ingress routers and treated according to their service class. In this research, we study the performance of VoIP in terms of delay and packet loss under varying load conditions when it is injected to typical network (QoS is not considered) and network with QoS supported by deployment of MPLS explicit routing or MPLS and DiffServ combination. The Network Simulator Tool has been used to simulate. The results from different simulation scenarios has been compared together, and it can be seen that, maximum gap of delay variation in the case of MPLS and DiffServ combination is 1.4 ms comparing to 60 ms in case of normal IP routing. In addition, the percentage of packet loss reduced significantly from 18.3% to 0.6%. Thus, service classification and proper traffic engineering achieves better QoS. Combination of MPLS and DiffServ satisfies both necessary conditions for QoS: guaranteed bandwidth and differentiated queue servicing treatment. MPLS satisfies the first condition, i.e., it forces applications flows into the paths with guaranteed bandwidth; and along these paths, DiffServ satisfies the second condition by providing differentiated queue servicing. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. TC-03-28 |
| Type | Research Study Project Report (RSPR) |
| School | School of Advanced Technologies (SAT) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Teerapat Sanguankotchakorn; |
| Examination Committee(s) | Ahmed, Kazi M. ;Erke, Tapio J.; |
| Scholarship Donor(s) | Ho Chi Minh City Post and Telecommunication.; |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2003 |