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It is well known that measuring the one-way delay of voice-over-IP (VoIP) packets is a daunting task. The challenge lies in the fact that the Internet implicitly enforces the end-to-end principle. This means that the endpoints are expected to operate independently. Without a synchronized timing, it is difficult for an endpoint to measure the one-way delay. This paper presents the refined version of...
One-way network delay is a critical parameter in VoIP as it allows the application to assess the perceived quality. However, it is well known that it is very difficult to measure one-way delay of the VoIP packets traversing the network. This is because the Internet architecture is based on the end-to-end principle in which the endpoints are connected to the network independently, typically without...
It is well known that packet loss is an indication of network congestion. Thus, numerous applications including adaptive control in VoIP detects packet loss and responds to reduce the congestion. However, detecting packet loss provides very limited information about the state of the network. In this paper, we attempt to use observations of the delay and loss correlation to characterize congestive...
Road traffic congestion is a growing problem in many cities around the world. Added with rising fuel cost, people are more than ever interested in road traffic information. Conventional methods to acquire road traffic condition, such as surveillance cameras, have several limitations in large scale implementation including high investment cost and limited coverage. In this paper, we present our work...
Packet loss has always been an effective indication of congestion in packet-switched networks. This is because the application, especially the TCP protocol, attempts to transmit packets to the maximum available bandwidth. However, media streaming applications have an intrinsic bandwidth requirement that is constrained by the streaming source. This characteristic indicates that media streaming is less...
The fundamental characteristics of VoIP are constant rate, delay sensitivity, and loss tolerance. VoIP over packet-switched networks including the Internet poses problems because the network service is not guaranteed to meet such requirements, i.e. the available bandwidth as well as the delay and loss bounds. Adaptive rate VoIP is a solution that can mitigate the problem. Adaptive rate VoIP has the...
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