| Author | Parinya Jinanukulwong |
| Call Number | AIT Thesis no.TC-98-06 |
| Subject(s) | Mobile communication systems
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Abstract | The design of distributed database (DDB) destined to store user information is a key
issue in third generation mobile communication systems such as UMTS. In particular, the
problem of determining the most appropriate DDB architecture for UMTS is critical due to
the anticipated requirements of high distribution and adaptability of information.
This thesis study presents the simulation model which allows nonbalanced and
balanced hierarchical DDB architectures to be evaluated in terms of query rate, average
queuing times, average service times, average search time, average queue sizes, number of
nodes passed per node and their distributions according to a given user mobility and a given
search operation.
We also discuss the simulation experiments concerning a query operation ansmg
from an access procedure performed on the DDB of a communication network covering
urban, road and rural areas. The model enables different traffic intensities offered in the area
queries come from and the external traffic offered from other DDB networks.
The simulation results show that the performance of distributed database depends on
the DDB architecture and the mobility behavior of users. The main problem in the DDB
network is queuing times. Structures with more number of branches per node in the lower
levels give the best overall performances. Nonbalanced hierarchical tree structure shows
better performances than balanced hierarchical tree structure since it can arrange the UINs to
cover the areas, which have different traffic offered. |
| Year | 1998 |
| Type | Thesis |
| School | School of Advanced Technologies |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Erke, Tapio; |
| Examination Committee(s) | Ahmed, Kazi Mohiuddin;Makeliiinen, Kimmo; |
| Scholarship Donor(s) | Jasmine International Public Co., Ltd. ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |