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Impairment Aware Manycasting Over Optical Burst Switched Networks



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This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the ICC 2008 proceedings Impairment Aware Manycasting Over Optical Burst Switched Networks Balagangadhar G Bathula Vinod M Vokkarane Rajesh R C Bikram Department of Computer and Information Science University of Massachusetts Dartmouth MA 02747 Email bbalagangadhar vvokkarane rrc umassd edu Abstract In this paper we discuss the effect of physical impairments on manycasting service over the optical burstswitched OBS networks Signal quality degradation in manycast networks is an important issue and it can occur due to ber attenuation splitter switch and ampli ed spontaneous noise in EDFA These physical layer impairments causes the signal quality to be weak at the receiver and hence burst may not be detected or lost Our objective is to select the manycast destinations based on the quality of signal received We propose a new algorithm impairment aware dynamic membership IADM that takes into account of the physical layer impairments Based on the simulation results we observe that IADM is more robust and practical as bursts are scheduled not just on contention but also on the physical layer constraints1 Keywords Manycast OBS Impairments BER and OSNR I I NTRODUCTION The manycast problem is de ned as follows given a network G V E where V is the nodes and E edges edge cost function is given by g E R an integer k a source s and the subset of candidate destinations Dc V Dc m k where Dc is the cardinality of the set Dc We nd a minimum cost tree spanning k destinations in Dc A manycast request is denoted by s Dc k The selection of k destinations out of m by the IP layer is similar to the random algorithm in 1 which has been proved to have poor performance Therefore supporting manycasting at the OBS layer is necessary for the bandwidth ef cient manycasting Data loss in OBS network can occur either due to burst contention or impairments in the ber Burst



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