Research Of Transmission Scheduling Algorithm Of Static Bulk Data In Store-and-forword Circuit Switching Networks

In recent years,with the rapid development of the Internet and cloud computing services,the global data is experiencing an explosive growth.Cloud service providers usually operate a large number of geographically distributed datacenters to bring the services close to the users and exploit lower power cost.Aiming to ensure the quality of services and improve the fault tolerance,cloud service providers need to synchronize and back up the data between geographically distributed datacenters periodically.However,the data amount of these transfers is huge which means the bulk data transfers will occupy a large amount of bandwidth resources.And optical circuit switching has become an effective solution for bulk data transfers because of its low power consumption,fixed bandwidth and high reliability.However,in transport networks with unbalanced link bandwidth,traditional circuit switching(TCS)“end-to-end circuit provisioning mechanism” will cause bandwidth resource wastage and result in the failure of bulk data requests be completed within the deadline further.TCS requires each link along the path to provide the same bandwidth capacity during the path establishment process,and maximum available bandwidth for the circuit is constrained by the minimum bandwidth of the link in the path.It is suitable to use store-and-forward circuit switched networks to transmit this kind of traffic to overcome the problem of bandwidth wastage caused by circuit switching “end-to-end circuit provisioning mechanism”.This paper investigates the problem of Static Bulk Data Transfer Scheduling(SBDTS)in store-and-forward circuit-switched networks.We proposed Intermediate Store and Transfer Schedule(ISTS)algorithm to handle the SBDTS,and studied the SBDTS problem under the different node storage capacity.The simulation results show that the storage-based ISTS algorithm can effectively improve the success rate and link utilization compared with TCS.In addition,we study the impact of different node storage capacity on network performance.Although the introduction of storage will increase the waiting time of the request,bulk data requests have the characteristics of delay tolerance and only require the request to be completed within the deadline.Therefore,store-and-forward circuit switched networks can handle static bulk data tranfers well,and ISTS is an efficient algorithm.