tailieunhanh - Resource Management in Satellite Networks part 19

Resource Management in Satellite Networks part 19. This book provides significant knowledge on innovative radio resource management schemes for satellite communication systems that exploit lower layer adaptivity and the knowledge of layer 3 IP QoS support and transport layer behavior. The book integrates competencies considering all the parts of system design: propagation aspects, radio resource management, access protocols, network protocols, transport layer protocols, and more, to cover both broadband and mobile satellite systems | 162 Giovanni Giambene Cristina Parraga Niebla Victor Y. H. Kueh Fig. Mean packet delay at RLC buffers for different packet scheduling algorithms. streaming applications have been serviced given that the detrimental affect is not posing significant degradation on the QoS target of streaming users. Figure shows the mean jitter experienced by each individual service when employing MLPQ and DDQ packet scheduling. Obviously DDQ features much lower jitter for both streaming service and download service than MLPQ especially for lower-class and lower date rate users. Since the unidirectional streaming service in S-MBMS is quite sensitive to delay-variation jitter this result proves that DDQ packet scheduling provides a way to balance all FACH queues in order to get the minimum delay variation for streaming services. Analysis of channel utilization ratio Figure shows the average S-CCPCH physical channel utilization for both MLPQ and DDQ. Both schedulers managed to achieve throughput values close to the optimum. For instance the S-CCPCH channel utilization ratios are respectively under MPLQ scheduling whilst they achieve respectively under DDQ scheduling. Therefore DDQ manages to obtain a slight channel utilization improvement on those S-CCPCHs carrying background traffic. To summarize the DDQ algorithm achieves the following advantages over the MPLQ scheduling scheme Dynamic proportional delay-driven prioritization 163 Chapter 5 ACCESS SCHEMES AND PACKET SCHEDULING TECH. Fig. Mean packet jitter at RLC buffers for different packet scheduling algorithms. Fig. S-CCPCH utilization for MLPQ and DDQ. 164 Giovanni Giambene Cristina Parraga Niebla Victor Y. H. Kueh Highest utilization for the background class without posing significant degradation on streaming class Significant improvement on mean delay and mean jitter performance Better overall system utilization. Packet scheduling with cross-layer approach Due to the .