An investigation into resource allocation during handover with dynamic guard bandwidth in wireless ATM | |
| Author | Kamolwun Dankhonsakul |
| Call Number | AIT Thesis no.TC-98-03 |
| Subject(s) | Asynchronous transfer mode Resource allocation |
| 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 | In Wireless Asynchronous Transfer Mode (WATM), when a handover occurs, the resource allocation for the nodes or links along the route serving the new handover connection always takes place. This thesis studies on the resource allocation (bandwidth) at an output link of a base station (BS) when handovers take place by considering with the dynamic guard bandwidth which is reserved to support handover calls. Two different traffic types, CBR voice and VBR video, are investigated. The queuing priority schemes, First-InFirst-Out (FIFO) and Measured-Based Priority Scheme (MBPS), are included in the dynamic guard bandwidth scheme. The performances of the fixed guard bandwidth and the dynamic guard bandwidth with and without the queuing priority scheme are investigated. The study is based on the network handover called Mobile Virtual Circuit (MVC) which is a dynamic connection tree. The results show that the dynamic guard bandwidth scheme is more efficient than the fixed guard bandwidth scheme. It can maintain the targeted handover call blocking probability better than the fixed guard bandwidth scheme. In the system which includes CBR voice and VBR video, the change in VBR traffic affects to the performances of the system more than the change in CBR traffic. The increment of VBR offered traffic increases the new call blocking probability and decreases the handover call blocking probability directly, while the change in CBR offered traffic causes the fluctuation of the probabilities and some performance measures. The behavior derives from the substantial difference in the bandwidth requirements of CBR and VBR. Using the handover protection schemes can improve the handover call blocking probability. The handover delay of VBR degradation calls is a critical performance measure in the queuing priority schemes, FIFO and MBPS, and dynamic guard bandwidth with queuing priority scheme. Transmitting loss-sensitive VBR traffic over degraded signal may affect to the quality of service so much that it can not be accepted. Therefore, if handover protection is required, the dynamic guard bandwidth scheme is the favourable scheme. However, in the case the system does not often have the degradation calls, it is possible to consider the FIFO, MBPS, and dynamic guard bandwidth with queuing priority scheme for handover protection. |
| 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) | Rajatheva, R.M.A.P.;Zhang, Jian-Guo ; |
| Scholarship Donor(s) | Telecom Finland ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |