To support diverse transmission requirements of multimedia applications, Quality of Service (QoS) should be provided in the Internet, where only the best-effort service is available. Based on the bandwidth broker model for realizing the IETF differentiated service (DiffServ), in this paper, we describe our recent effort on the implementation and verification of an extendable and flexible QoS allocation and resource management system. Focusing on the bandwidth issue over single administrative domain, the implemented system provides real-time resource reservation and allocation, delayed call admission control, simple QoS negotiation between server and user, and simple resource monitoring. The implemented system is verified by evaluating the performance of a resource-intensive application over the real-world testbed network.
To ease multimedia streaming over the QoS-deficient Internet, the
network-adaptive streaming has been introduced recently. For an
unicast media streaming environment, TCP-friendly end-to-end
congestion control is widely suggested to handle the network
congestion. However, the congestion control usually gives abrupt
changes in the available bandwidth between streaming systems and
the performance of media streaming can be degraded. To help this
situation, we can adaptively control the playback speed of audio
and video by adopting the time-scale modification technique. It
can mitigate the effect of network variations in delay and loss,
especially focusing on the low-latency video streaming situation. In this paper, we attempt to improve the streaming quality, when the congestion control is applied, by taking advantage of the adaptive playout mechanism. It can pro-actively prepare for imminent change with the adaptive playout capability, by estimating the expected buffer level and adjusting change in transmission rate, and controlling the playback rate.
Multicast streaming has been extensively investigated to tackle the network bandwidth challenge. However, the ubiquitous deployment of IP multicast on the Internet is expected only after several years to come due to the manageability and scalability problems. We study a pragmatic solution to enhance the feasibility of multicast media streaming by focusing on an one-to-many streaming over the source specific multicast (SSM) service. In [1], we propose a synchronized multicast media streaming framework employing server-client coordinated adaptive playout. The adaptive playout mechanism controls the playout speed of audio and video by adopting the time-scale modification of audio. Based on the overall synchronization status as well as the buffer occupancy level, the playout speed of each client is manipulated within a perceptually tolerable range. In this work, we are extending the framework to incorporate the error recovery. Each client performs an interactive error recovery with the assistance of adaptive playout. RTCP-compatible signaling between the server and clients is performed, where the cumulative feedback for retransmission (to address the bandwidth restriction on the control messages) is assisted by the adaptive playout. The simulation results demonstrate several enhancements in terms of playout discontinuity and error recovery.
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