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Determination of Average Handover Latency in Bi-Directional Tunneling Method in MIPv6 Networks

Malekin R., Abdullah A. H.

Przegląd Elektrotechniczny

2013

R. 89, nr 4

156-159

Mobile IP allows for a Mobile Node to remain reachable during handover to a new foreign network. When an mobile node moves to a new network, it will be unreachable for a period of time. This period is referred to as handover latency. In general, it is caused by the time used to discover a new network. This period of time for real-time applications, such as video coference and VOIP, which are time sensitive should be very short. IP mobility must be able to support performance in terms of initializing the handover as well as smoothing the process. In this paper, we evaluate handover latency based on highest probability of the latency in mobile Internet protocol verson 6 networks when mobile and correspondence nodes are using bi-directional tunneling over mobile IPv6 networks through simulation.

W artykule omówiono zagadnienie opóźnienia przejścia sygnału użytkownika między dwoma sieciami komórkowymi, w przypadku wyjścia z zasięgu jednej z nich. W oparciu o symulacje wykonano szacowane obliczenia opóźnienia przekazania sygnału, w oparciu o czynnik największego prawdopodobieństwo opóźnienia w sieci mobilnego internetu o protokole w wersji 6. Badanie przeprowadzono dla przypadku obustronnego tunelowania dwukierunkowego w sieci mobilnej IPv6.

Auction Models Supporting End-to-End Connection Trading

Kołtyś K., Pieńkosz K., Toczyłowski E.

Journal of Telecommunications and Information Technology

2012

nr 2

55-62

The paper concerns bandwidth allocation problem on the telecommunication market where there are many sellers and buyers. Sellers offer the bandwidth of telecommunication links. Buyers are interested in the purchase of the bandwidth of several links that makes up an end-to-end connection between two nodes of telecommunication network. We analyze three auction models supporting such a bandwidth exchange: NSP (network second price), BCBT (model for balancing communication bandwidth trading) and BCBT-CG which is a modification of BCBT that applies column generation technique. All of these models concern divisible network resources, treat bandwidth of telecommunication links as an elementary commodity offered for sale, and allow for purchasing bandwidth along multiple paths joining two telecommunication nodes. All of them also aim at maximizing the social welfare. Considered auction models have been compared in the respect of economic and computational efficiency. Experimental studies have been performed on several test instances based on the SNDlib library data sets.