Research On Conflict Avoidance Mechanism Based On Photoelectric Integrated Exchange In Optical Network

At present,optical networks carry multiple IP services.With the rapid growth of IP service,the demand for network bandwidth becomes higher and higher,and the existing network bandwidth resources cannot always meet the needs of the business,which easily leads to the conflict of business resources.At the same time,due to limited factors such as network structure and service attributes,the load rate of link resources at different locations in the whole network varies a lot.While some links have resource competition conflicts,some links are idle.Due to the uncertainty and unpredictability of IP traffic,the dynamic allocation of network bandwidth resources is becoming more and more urgent.The author has conducted research design and experimental testing on resource competition conflicts caused by load increase from the aspects of network topology and node architecture.The main content and research results are as follows:Firstly,the author has put forward the Load-Balance-based Deflection Routing(LBDR)according to optical burst switching(OBS)mechanisms to avoid conflict,based on the Shortest Path Deflection Routing(SPDR).The author has focused more on Load balancing,the introduction of rewards and punishment mechanism,channel prediction and controllable retransmission mechanism.Simulation results have showed that LBDR could reduce the burst loss probability by about 45%and promote the resource utilization by 3%.Secondly,aiming at the conflict avoidance scheme at the nodes in the optical network,the author has built a photoelectric exchange control platform to simulate the network nodes in the optical network,which laying a foundation for the implementation of the scheme.The author has done the following things to build the platform in order to provide a verification platform for the conflict avoidance mechanism at the node architecture level:configured a high precision system clock,realized the encoding and decoding of photoelectric physical layer interface,implemented business-related IP data flow processing,designed logic for interface across clock domains,finished communication maintenance module and achieved the transmission,processing and control of business data packets.Thirdly,based on the characteristics of data transmission of network nodes,the Cache-based Collision Avoidance Mechanism(CCAM)has been proposed according to transmission,processing and control.On the basis of the photoelectric exchange control platform,the experimental scheme module of CCAM has been designed and implemented.Under the circumstance of limited link resources,the data packets that need to be cached to avoid loss have been processed,and the data interface scheme has been further studied to realize the call and control of the memory and cache.Experimental results have showed that CCAM could reduce the service loss rate to 10-4 when the data volume of a single node did not exceed 6Gbps.