| Author | Das, Nagendra Kumar |
| Call Number | AIT Thesis no.TC-00-07 |
| Subject(s) | Code division multiple access
|
| Note | A thesis 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 | Thesis ; no. TC-00-07 |
| Abstract | Nowadays, rapidly growing different kinds of information services demand more and
more capacity from the transport network over which these services can operate. The concept
of all - optical network may help to accommodate constantly growing bandwidth demands as
it can support bandwidths in the range of Terabits per second. Further improvement towards
network bandwidth increase is provided by the wavelength division multiplexing (WDM)
technology where each fiber in a network can carry more than one signal on different
wavelengths. Recent studies show that in most cases internet traffic in communication
networks show long range dependency and is not Poisson and hence an investigation is
needed to understand the behavior of such networks when the traffic show long range
dependency.
This thesis work studies traffic performance of WDM optical networks under long
range dependent traffic pattern which can be modeled as Pareto distribution. The network
scenario is varied in four types and in five capacity of wavelengths in WDM. The 6 node ring
network and 12 node ring network are investigated to understand the impact of growing
network sizes in sparsely connected networks. The 13 node mesh network is investigated to
understand the behavior of well connected networks. The 21 node ARP A2 network is
investigated to understand the behavior of arbitrarily connected networks under such traffic.
Two wavelength assignment techniques, random routing and sequential routing, are
investigated. Finally, a comparison is made between performance with Poisson and Pareto
service time distribution.
Simulation results show that the random assignment of wavelengths gives higher
blocking in the network than sequential wavelength assignment. From simulation it has also
been found that the network size increment in sparsely connected networks has lesser effect
on improving the performance as compared to the case of well connected networks. It is also
shown that the Poisson model underestimates the blocking for the case of Pareto model.
Simulating with different topologies of networks it was demonstrated that the Pareto model
always has a higher blocking probability than the Poisson model and networks designed for
Poisson traffic may be unsuitable for carrying long range dependent traffic. |
| Year | 2000 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-00-07 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Erke, Tapio ; |
| Examination Committee(s) | Ahmed, Kazi M.;Sharma, A. B. ; |
| Scholarship Donor(s) | Government of Finland; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |