This paper investigates a novel active buffer management scheme, "Jitter Detection" (JD) for gateway-based congestion control to stream multimedia traffics in packet-switched networks. The quality of multimedia presentation can be greatly degraded due to network delay variation or jitter when transported over packet-switched network. Jitter degrades the timing relationship among packets in a single media stream and between packets from different media streams and hence creates multimedia synchronization problems. Moreover, too much jitter will also degrade the performance of the streaming buffer in the client. Packets received by client will render useless if they have accumulated a large enough jitter. The proposed active buffer management scheme will improve the quality of service in multimedia networking by detecting and discarding useless packets that accumulated large enough jitter. Such as to maintain a high bandwidth for packets within the multimedia stream's jitter
tolerance. Simulation results have shown that the proposed scheme can effectively lower the average received packet jitter and increase the goodput of the received packets when compared to random early detection (RED), and Droptail used in gateway-based congestion control. Furthermore, simulation results have also revealed that
the proposed scheme can maintain the same TCP-friendliness when compared to that of RED and Droptail used for multimedia streams.
Recently, researchers have investigated the use of photonic circuit switching, or optical time division multiplexing, as a mean to sub-divide the bandwidth of wavelength channels in Dense Wavelength Division Multiplexing networks. In this paper, we present our study on the use of optical buffer in a photonic circuit switching network and how routing and time-slot assignment can be used to optimize the effectiveness of optical buffer. We will also discuss how photonic circuit switching may be integrated into the emerging IP-centric control and management scheme of GMPLS.
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