Managing QoS in Multimedia Networks and Services: IEEE / by Nadjia Kara, Jean Conan, André Girard (auth.), José Neuman
By Nadjia Kara, Jean Conan, André Girard (auth.), José Neuman de Souza, Raouf Boutaba (eds.)
Welcome to the 3rd overseas convention on administration of Multimedia Networks and providers (MMNS'2000) in Fortaleza (Brazil)! the 1st MMNS used to be held in Montreal ( Canada) in july 1997 and the second one MMNS used to be held in Versailles (France) in November 1998. The MMNS convention occurs each year and a part and is aimed to be a very foreign occasion via bringing jointly researchers and practitioners from everywhere in the international and through setting up the convention every time in a unique continent/country. during the last a number of years, there was a large amount of examine in the fields of multimedia networking and community administration. a lot of that paintings has taken position in the context of coping with Quality-of carrier in broadband built-in prone electronic networks akin to the A TM, and extra lately in IP-based networks, to reply to the necessities of rising multimedia functions. A TM networks have been designed to help multimedia site visitors with various features and will be used because the move mode for either stressed out and instant networks. a brand new set of net protocols is being constructed to supply greater caliber of carrier, that's a prerequisite for assisting multimedia purposes. Multimedia purposes have a special set of necessities, which affects the layout of the underlying communique community in addition to its administration. numerous QoS administration mechanisms intervening at diversified layers of the verbal exchange community are required together with QoS-routing, QoS-based delivery, QoS negotiation, QoS edition, FCAPS administration, and mobility management.
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Additional info for Managing QoS in Multimedia Networks and Services: IEEE / IFIP TC6 — WG6.4 & WG6.6 Third International Conference on Management of Multimedia Networks and Services (MMNS’2000) September 25–28, 2000, Fortaleza, Ceará, Brazil
8 . 8 link length (K m) . 8 . 7 ~ .. · ~ 0 . 5 Fdrness- 3000 0311 swtdl . 96 . 5-'" • SD '. : .. 5 Link length (K m) Figure 6. Performance of SD+ V s. SD for large number of sources From tables (1), (2), (3) and (4) the following observations can be made: Buffer size is proportionally related to performance: It is clear that switches with larger buffer size lead to obvious increase in TCP efficiency and configuration fairness; under same network conditions. The switch with 3000 cells buffer capacity leads to 10% ~ 40% rise in the efficiency and 1% ~ 7% rise in fairness index than that of 2000 cells buffer size.
Reserving more than 15% rapidly increases the total number of class 1 calls blocked during handoff. This suggests that bandwidth prioritisation, or reallocation from neighbouring cells, especially for highly mobile and burst users, should be studied further. 3 BW Increase (Mbps) -+-class 1 --class 2 -"-class 3 -*-class 4 --lIf- total Figure 1. c '0 0 40 z 20 0 0% 5% 10% 15% 20% 25% BW Reserved (Percentage of total bandwidth) 25! I :0 '0 ci 5 Z 0% 5% 10"/0 15% 20% 25% FNV Reserved (Percentage of total bandwidth) -+-dass 1 ______ dass2 -+-dass3 ""*-dass4 Figure 2.
Nearly half (150 1 traceroutes) of the fluttering paths either have jp 1 or se 1 as source or destination site. We also found that most of the affected paths have only one or two hops involved in fluttering, a case which we call a minor fluttering. To understand the distribution of fluttering, we assigned weights to fluttering paths. If a hop had more than one router reported, we assigned 1 to it, otherwise it was assigned the weight O. The weight of a traceroute is the sum of weights of all hops.