TES-based traffic modeling for performance evaluation of integrated networks
IEEE INFOCOM '92 Proceedings of the eleventh annual joint conference of the IEEE computer and communications societies on One world through communications (Vol. 1)
Alternative bandwidth allocation: algorithms for packet video in ATM networks
IEEE INFOCOM '92 Proceedings of the eleventh annual joint conference of the IEEE computer and communications societies on One world through communications (Vol. 3)
Packet Video: Modeling and Signal Processing
Packet Video: Modeling and Signal Processing
INFOCOM '95 Proceedings of the Fourteenth Annual Joint Conference of the IEEE Computer and Communication Societies (Vol. 2)-Volume - Volume 2
On improving voice quality under dynamic encoding algorithms in ATM networks
ISCC '95 Proceedings of the IEEE Symposium on Computers and Communications (ISCC'95)
Real-time transmission of multilayer video over ATM networks
Computer Communications
| Hi-index | 0.00 |
We consider a multiplexer station which supports ATM video traffic streams. The system model also applies to the multiplexing operation carried out at the output queue of each output-queueing ATM switch. We assume that video signals are encoded by a two-level layered encoding algorithm under which each ATM cell is properly marked as a high-priority (HP) or low-priority (LP) cell according to the significance of the information carried by the cell. The video multiplexer implements a congestion-control based cell-discarding algorithm under which, when high congestion conditions are observed, the LP cells are discarded. In previous studies, the quality of the video streams under such a combined mechanism (of layered encoding and cell discarding algorithms) has been examined for a single stream, without incorporating the impact of the multiplexing operation. In addition, only long-term video quality behavior has been considered. In this paper, we take into account the high burstiness embedded in the video traffic as observed by the multiplexer at the cell-level and the frame-level time scales. We show that, if not carefully designed, a cell-discarding algorithm can cause both inter-frame and intra-frame short-term video quality degradations. To correct this situation, we introduce new cell-discarding algorithms which incorporate a probabilistic mechanism into their cell discarding scheme and which take into account the features of the bursty inter-frame and intra-frame processes. Two Video Degradation Indicators are introduced to measure the short-term inter-frame and intra-frame video quality degradation features experienced by a video stream. Through numerical examples, we identify and compare the system performance behavior under the introduced cell-discarding algorithms. It is shown that, under a prescribed long-term video quality level, the introduction of a probabilistic component in the cell-discarding process significantly improves the system performance, including the short-term video quality and the mean cell waiting time functions. In addition, it is observed that by dynamically calculating the value of the probabilistic component, the short-term video quality performance is further improved.