TAILIEUCHUNG - Resource Management in Satellite Networks part 34

Resource Management in Satellite Networks part 34. 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 | Chapter 10 CROSS-LAYER METHODS AND STANDARDIZATION 319 Scheduling strategies for satellite HSDPA transmissions see subSection . The aim of this study is to investigate the applicability of the HSDPA air interface in the GEO satellite case characterized by high propagation delays but also by slow channel variations. Suitable scheduling techniques are investigated to guarantee the QoS support for multimedia traffic flows sent to mobile users. The following technique has been proposed in Chapter 6 along with results for a LEO mobile scenario . Scenario 3 in Chapter 1 Section Handover and Call Admission Control see sub-Section . An inter-satellite scenario with satellite diversity in a multimedia LEO satellite system has been investigated. The interest is in identifying handover techniques that are able to fulfill the requirements in terms of both call blocking probability new calls and call dropping probability calls in progress . Optimizations combining higher and lower layers A set of approaches summarized below have been investigated that yield cross-layer methodologies and optimization involving MAC and IP and or transport layers. Bandwidth allocation taking into account TCP behavior see Section . TCP results in a bandwidth request that is time-dependent following the slow start and congestion avoidance mechanisms. A fixed RRM allocation strategy can lead to either wastage of resources if dimensioned to the maximum or inability to satisfy transient requirements. This study has proposed a TCP-driven RRM scheme that allocates resources by taking into account the behavior of the TCP congestion window internal state of the TCP protocol for each flow. In this case Scenario 2 has been considered. The results obtained highlight that the proposed cross-layer RRM scheme can improve the performance at the TCP level. Protocol integration between Ethernet-like layer-2 and satellitespecific MAC see Section . This optimization focuses on the .

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