Resource Management in Satellite Networks part 30. 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 | 276 Ulla Birnbacher Wei Koong Chai Fig. Possible network topology with two VLANs available. See reference 44 . Copyright @2005 IEEE. particular UDP traffic is obtained via simulation of unidirectional constantrate video connections also packet distribution is constant. Three UDP groups of users have been considered that differ in terms of both bit-rate . 256 128 and 64 kbit s respectively for Class I II and III users and the average request inter-arrival time which is exponentially distributed so that the arrival process of connection requests is Poisson . Mean inter-arrival times are respectively 45 s for Class I s for Class II and s for Class III. Each connection has a duration exponentially distributed with mean value of 180 s. The number of users in a group is selected so that each UDP group offers 1 Mbit s traffic in average directed from nodes located in T1 to T2. As for TCP-based traffic the following results have been obtained by considering the separate contribution of three groups of FTP users. Every user located in T1 requests files of B bytes where B is exponentially distributed with a mean of 5 000 000 bytes while the file request inter-arrival time is exponentially distributed with a mean of 5 s. User groups are differentiated based on the available resources allotted in the access link Class I High Rate has an aggregate guaranteed rate of 512 kbit s for the downstream and 128 kbit s for the upstream Class II Medium Rate has an aggregate guaranteed rate of 128 kbit s for the downstream and 32 kbit s for the upstream eventually Class III Low Rate has an aggregate guaranteed rate of 64 kbit s for the downstream and 16 kbit s for the upstream. Each group saturates its link capacity due the high file request rate 5 files per second are requested . about 25 MByte per second which requires at least 120 Mbit s plus the protocol overhead the system is overloaded and the number of FTP requests overwhelms the number of FTP sessions that .
