Upstream dynamic bandwidth allocation algorithm for different service classes in Ethernet Passive Optical Networks | |
| Author | Ronruechai Jamfoong |
| Call Number | AIT RSPR no.TC-06-01 |
| Subject(s) | Broadband communication systems--Simulation methods Ethernet (Local area network system) |
| Note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. TC-06-01 |
| Abstract | Due to the fast development of new broadband telecommunication services and the demand for high speed services, the last mile or the local access network needs to be upgraded to allow on demand use of large bandwidth. Fiber based access network can deliver and support the increasing demands for high speed connections. One of the new technologies that have emerged in recent years is Ethernet Passive Optical Networks (EPONs). The key features of this approach are the simplicity of the architecture and compatibility with the existing Ethernet based local area networks. To make EPONs fully functional, it is necessary that different service classes can be supported. In this research we propose an upstream dynamic bandwidth allocation algorithm for different service classes in EPONs. In the proposed scheme, all the access control and bandwidth allocation are performed at the Optical Line Terminal (OLT), located in the central office leaving the Optical Network Units (ONUs) at end users simple. Three traffic classes according to Differentiated Services (DiffServ) are considered: Expedited Forwarding (EF), Assured Forwarding (AF), and Best Effort (BE). We conduct simulation experiments using OPNET to analyze the algorithm performance in three scenarios. The first scenario is the Static Bandwidth Allocation (SBA) scheme which is the baseline case. The second scenario is a Dynamic Bandwidth Allocation (DBA) scheme (referred to as DBA 1) that allocate bandwidth based on actual traffic demands. Finally, we extend DBAI by granting some guarantee minimum allocation bandwidth to high priority traffic, and refer to this scenario as DBA2. The simulation results show that SBA is satisfactorily support for EF traffic in the DiffServ architecture. However, the drawback is lack of efficient bandwidth utilization. DBA 1 can achieve better performances in term of average packet delays, average queue sizes, as well as throughput or bandwidth utilization compared with SBA. Finally, DBA2 is a compromise between SBA and DBAI in term of bandwidth utilization. In addition, DBA2 can provide a trade-off between reducing the packet delays of EF traffic at the expense of higher packet delays of the AF and BE traffic |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. TC-06-01 |
| Type | Research Study Project Report (RSPR) |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Poompat Seangudomlert; |
| Examination Committee(s) | Teerapat Sanguankotchakorn ;Erke, Tapio J. ; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2006 |