Study On Cross-Layer Resource Management Technologies In Satellite Communication

With the popularity of smart mobile terminal, increasing demand for multimedia services business have been impelling information society to show explosive growth. In order to meet user demand for high-speed access to the Internet, satellite communication is an efficient solution. Since satellite bandwidth resources is very valuable, rational and efficient use of spectrum resources are the satellite resources management research. The idea of cross-layer design to improve the resource utilization of satellite communications is become one of research focus at present.Based on DVB-RCS satellite communication system, the essay researched the cross-layer satellite resources management. We have achieved some innovative research as follow:1. Aiming at further improving the fairness and system utility of the satellite communication system digital video broadcasting-return channel satellite (DVB-RCS) dynamic bandwidth allocation (DBA), a novel cross-layer dynamic bandwidth allocation model is proposed. With cross-layer thinking, the model takes both application layers’ quality of service (QoS) requirements and physical layer channel state conditions into consideration, transforming the allocation problem into a nonlinear programming to realize the optimization of the fairness and system utility. Also a global optimization algorithm of dynamic bandwidth allocation is proposed based on the model of cross-layer design, and the algorithm can ensure the overall optimal allocation of satellite resources within a period of time. The simulation results show that the model can maximize the throughput of satellite communication system while ensuring user fairness. The overall optimization algorithm can be well adapted to the change of traffic types and the number of users.2. Satellite resource management algorithms have closely linked with satellite communication TCP protocol. We improve the performance of satellite TCP protocol by the idea of cross-layer design. We have analysed the limitations of the existing satellite TCP protocol. According to the characteristics of satellite communication link long delay and high channel error, we proposed a link layer queue cross-layer TCP protocol improvement. By recording link layer queue length information, the proposed scheme send cross-layer feedback to the transport layer congestion control module, thus the protocol can activate the correct congestion control algorithm. The simulation results show that the proposed scheme is effective to avoid the affect of satellite high error, and reduce the satellite network latency and improve throughput.3. We proposed a cross-layer TCP protocol improvement based on packet loss discrimination, which can distinguish network congestion and channel errors in order to activate the correct congestion control algorithm. The improvement combined the physical layer ACM technology cross-layer optimization TCP protocol performance. By theoretical analysis, the proposed improve the system throughput and anti-noise performance.