Optimization Of Optical Slot Allocation Algorithm

With the rapid development of the Internet and the explosion of data center capacity,it also brings unprecedented challenges to the construction of internal data center.In order to reduce the construction cost and energy consumption of the data center and improve the efficiency of data transmission in the data center,this thesis explores the research idea of introducing optical switching into the internal interconnection network of the data center.Firstly,combined with the internal business transmission requirements of data center and the research status of optical switching technology,a data center optoelectronic hybrid transmission network based on optical time slot switching mechanism is proposed.At the same time,the business transmission requirements are uniformly allocated through software defined network control architecture,and the appropriate routing,wavelength and time slot are allocated for the data flow.According to the destination address of the flow,the data flow between servers in the same rack is distributed.The demand of data transmission is directly realized through the overhead packet switch;the data communication between servers in different racks is realized through the optical time slot switching network to achieve low energy consumption and efficient data transmission,giving full play to the respective advantages of electric packet switching and optical time slot switching,and better supporting the high dynamic burst services between racks through the reconfigurable characteristics of the optical time slot switching network.In view of the above research ideas,firstly,through theoretical analysis,the cost and energy consumption of optoelectronic hybrid interconnection network and traditional electrical switching interconnection network are compared;secondly,based on OMNeT++network simulator,the network simulation environment of optoelectronic hybrid data center combined with software defined network control system is built,mainly through the construction of optical slot switching equipment modeling and control information interaction process controlling.Finally,the optical switching network structure of n-dimensional hypercube,optical slot switching mechanism controlled by software defined network,optical slot service adaptation and slot allocation algorithm are implemented,and the feasibility and effectiveness of the above mechanisms are verified by simulation.Simulation results show that the proposed mechanism ensures that the data flow in optical timeslot switching network can be transmitted through optical timeslot switching network without conflict.Moreover,the slot allocation is continuous,which reduces the costs of link switching,improves the network utilization.Compared with the traditional data center network structure,the flow transmission completion rate is increased by 13.6%,and the flow transmission delay is reduced by 11%,which effectively optimizes the network performance,and can better support various services in the data center.