Research Of Scheduling Mechanism And Wireless Bandwidth Allocation Mechanism Of On-board Switching In Spatial Information Networks

As satellite communications in the military and civilian applications of the continuous in-depth, as well as satellite communications technology and the continued integration of computer technology, space earth integrated spatial information network has been of great importance to all countries and regions, satellite equipment as the core entities of that, experiencing from the "bent-pipe" to with on-board processing and on-board switching technology, two important stages. On-board equipment, subject to space-level devices payload, power, volume and other factors, storage capacity is limited and difficult to expand, it is very difficulty to build large-capacity, high-speed switching module in the satellite systems, there are many technical difficulties in on-board switching mechanism, switching networks, scheduling algorithms performance and radio resource management.In this paper, based on the ATM mechanism, we select the internal non-blocking Crossbar switch architecture, aim at this architecture, we propose a serial poll scheduling algorithm En-ISP adapting to on-board switching, on the base of taking account of the fairness of each port, the algorithm serial polling each input port, the arbitration of the output port whose request received less has a priority, choose a destination output port in RoundRobin way, renew the value of polling point after match, increasing the probability of match of the input-output port, and through OPNET simulation software with two similar algorithms ISP and iSLIP in the average delay, bandwidth utilization and transmission bit error rate comparison, the algorithm has lower latency and transmission error rate and higher bandwidth utilization without no more complexity. Based on the research of the characteristics of satellite radio resource management, aim at the special needs of battlefield command and control network, communication terminal, network nodes dynamically effective, safe, high security level for military applications, design the on-board self-adaption radio bandwidth allocation algorithm suitable for battlefield command networks. The algorithm allocate bandwidth for each temininal according to their priority beforehand, radio resourse management judges the dynamical availability of each node by signal monitor, withdraw the bandwidth of the invalid node and allocate it to the new joining node, we give a detailed description of the algorithm and simulation analysis of the probability of success of bandwidth allocation for different business types, in view of the actual battlefield command network of real-time business a larger proportion of the total business, the algorithm applied to wireless bandwidth allocation in satellite networks, on this basis, we make an integrated design of on-board ATM switch system. Finally, the full text of the work is summarized and future research work is of the prospect.