Performance Of Reliable Blast UDP Over Labeled Optical Burst Switching Networks

Labeled Optical Burst Switching (LOBS), which combines the best of the OCS / OPS and takes advantage of MPLS, is a promising optical network infrastructure. It is the focus of the research of optical switching. Firstly a practical LOBS test bed is presented in this paper. The framework and the layouts of the system are redesigned. A new FPGA management module is added to handle the requests from different application modules, which include GMPLS interface, SNMP agent and MPLS control module. FPGA driver is also updated with new read/write operation. Modifications enable the system to connect with GMPLS region and to recover from hardware errors, by which global stability is improved.In this paper, the performance of RBUDP over LOBS networks is theoretically investigated based on the NS2. The principle of RBUDP is analyzed and a transmission model of RBUDP in LOBS networks is proposed. Simulations and Experiments are processed with different parameters, such as assembly parameters and burst loss probability over LOBS test bed. With different burst assembling time threshold (1ms-100ms) and burst assembling length threshold (100Kbytes -300Kbytes), the results show the throughput of RBUDP client only depends on the available bandwidth of the network. Experimental results also show RBUDP features high (95%) average utilization efficiency of bandwidth and insensitivity to large assembly delay (100ms) and high burst loss probability (1%). The total transfer time is mainly affected by the burst loss probability, and increase linearly with the payload. Under the condition of burst loss probability of 0.1%-1%, sending rate of 100Mbits/s-1Gbit/s and payload size of 200Mbytes-2Gbytes, the differences between the experimental results and the simulation results is less than 2%.The first chapter introduces the basics and the key technology of LOBS networks. Then the transmission problems of TCP over high-bandwidth network are explored. Meanwhile several UDP-based protocols are introduced and compared. The second chapter presents a simulation environment based on NS2 and a LOBS test bed. The detailed designation of the FPGA management module and FPGA driver is described. In the third chapter, the principle of RBUDP and its transmission model in LOBS networks is analyzed. The results of simulations and experiments are given out. In the last chapter, the works are summarized. Several viewpoints and ideas are proposed for the future research on transmission protocols over LOBS networks.