04088nas|a2200457 a 4500 20260817162438.0 100309s2009 th uu|m rtt 0| a1eng d .b1207410x AIT Thesis no.ICT-09-03 Ghimire, Jagadish Analysis of supernode based peer-to-peer system for IP telephony over wireless ad hoc networks Pathum Thani, Thailand : Asian Institute of Technology, 2009 89 leaves : ill. + 1 online resource Thesis ; no. ICT-09-03 A thesis submitted in partial fulfillment of the requirements for thedegree of Master of Engineering inInformation and Communication Technologies, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 2009 This thesis work is in relation to the Supernode(SN)-based Peer-to-Peer (P2P) service control overlay for IP telephony service over wireless ad hoc networks. The first part of the work considers the problem of analyzing Session Set-up Delay (also known as post-dialling delay) and capacity of SN-based P2P overlay. Owing to the fact that IP telephony services are supposed to operate below a certain average post-dialling delay, analysis of lookup delay becomes important in the scenario of IP telephony. Capacity in terms of lookup processing is another performance parameter that determines the maximum number of users the system can support without a high call-drop rate. In this thesis work, we have followed a mathematical approach to derive closed-form expressions for the mean lookup delay and capacity of ring-topology and chord based service control overlay as a function of the number of SNs. The derivations are verified using equivalent simulations. Lower bounds on the number of underlay hops traveled by a lookup message in a wireless ad hoc network have also been proposed. The results show that, for a given lookup query load into the system, there exists a number of SNs where the overlay lookup delay is minimum. The results also show that capacity might not always increase arbitrarily with an increase in number of SNs. We find that overlay topological structure can have a very significant impact in the capacity scaling of such networks. The second part of the work defines a node connectivity index (CI) as a "one»valued" measure of quantifying connectivity of a node in a wireless ad hoc network. We use the proposed CI as a criteria of SN selection. We show by simulations that the SN selection based on proposed CI criteria result in more robust overlays against random link and node failure Internet telephony Peer-to-peer architecture (Computer networks) Ad hoc networks (Computer networks) Teerapat Sanguankotchakorn, Chairperson Erke, Tapio J., Examination Committee Rajatheva, R.M.A.P, Examination Committee Crespi, Noel, Examination committee Mani, Mehdi, Examination committee Asian Institute of Technology Fellowship, Scholarship donor Asian Institute of Technology. Thesis ; no. ICT-09-03 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B03143 .b1207410x mnait u 240329 0 100309 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120702484 CREATED : 2010-09-03 RECORD # : i12631012 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120702476 CREATED : 2010-09-03 RECORD # : i12631024 LPATRON : 1022417 LCHKIN : 2011-05-20 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 0 Barcode : 30050160097993 CREATED : 2016-04-29 RECORD # : i12965042 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 5048 5048 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.ICT-09-03 30050120702484 2026-08-17 16:24:38 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.ICT-09-03 30050120702476 2026-08-17 16:24:38 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.ICT-09-03 30050160097993 2026-08-17 16:24:38 1 2026-08-17 40