The 9th International Conference on Advanced Communication Technology

2007

DOI: 10.1109/icact.2007.358595

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A Study on SIP-based Instant Message and Presence

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Cited by 4 publications

References 22 publications

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An Efficient Earthquake Early Warning Message Delivery Algorithm Using an in Time Control-Theoretic Approach

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Ubiquitous Intelligence and Computing

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An Efficient Earthquake Early Warning Message Delivery Algorithm Using an in Time Control-Theoretic Approach

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et al. 2011

Ubiquitous Intelligence and Computing

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Studying the effect of transmission rate and packet size parameters on VoIP performance

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2012

2012 International Conference on Computer &Amp; Information Science (ICCIS)

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In recent years, VoIP over Wireless Local Area Networks (VoWLAN) technology has been increasingly on demand due to its advantages such as it is cheaper and supports mobility. Yet, the required stringent service quality for VoIP applications particularly in WLAN is still a challenge. This paper investigates the effect of two key parameters on VoIP quality; transmission/data rate and packet size. In this study, the data rate value can be 11, 5.5, 2, or 1 Mbps according to IEEE802.11b WLAN, while packet size is determined by the number of frames inserted in the packet. A simulation study has been implemented using OPNET Modeler. The first part of the results compares VoIP quality values obtained for each data rate. It also shows how decreasing the data rate degrades the VoIP performance. On the other hand, the second part of the results demonstrates how changing voice packet size can significantly affect VoIP quality. Further, it is discussed and analyzed the effect of packet size on delay, packet loss and network bandwidth requirement which accordingly affects VoIP quality.

An efficient notification service algorithm for earthquake early warning system

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2011

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