Cooperative packet scheduling via pipelining in 802.11 wireless networks
Proceedings of the 2005 ACM SIGCOMM workshop on Experimental approaches to wireless network design and analysis
Impact of bounded delays on resource consumption in VoIP networks
CSNA '07 Proceedings of the IASTED International Conference on Communication Systems, Networks, and Applications
The effects of network neutrality on the diffusion of new Internet application services
Telematics and Informatics
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Voice over IP (VoIP) services will play an importantrole in future IP networks, promising cost savings andnew revenue sources to operators and service providers.To provide quality of service guarantees, certainmechanisms need to be implemented which supportpredictable packet handling, bandwidth allocation, andcall admission control. In order to configure thesemechanisms, a solid understanding of VoIP trafficcharacteristics and its respective bandwidth requirementsis necessary. In this paper, we characterize traffic tracesgenerated by various VoIP applications. According to theH.323 standard, the characteristics are described bymeans of token bucket parameters which are then used toderive the required service rates for individual trafficflows. While in most cases sources send out fairly steadypacket streams, there are situations where software-basedclients emit rather bursty traffic resulting in unreasonablyhigh bandwidth needs. On basis of these traffic flows, weinvestigate the effects that token bucket parameters haveon the bandwidth demand and discuss tradeoffpossibilities in order to reduce it.