Design And Simulated Implementation Of Dynamic Multicast Traffic Grooming Algorithms In Military Multi-granularity Optical Networks

With the development of network technology,the requirements for the military communication are increasing.Multicast has become an important type of application.The Wavelength Division Multiplexing(WDM)optical network provides a good network infrastructure for the various bandwidth requirements for multicast.In IP over WDM optical networks,the required bandwidth of each multicast connection is generally less than a full wavelength capacity,so that it will lead to inefficient resource utilization if each connection of IP user is accommodated in one light path.In order to achieve higher resource utilization and lower blocking probability,it is needed to groom a lot of low-speed connections into a few of high-speed optical channels.This is the traffic grooming technology.At the same time,as the number of wavelengths in each fiber increasing,the number of ports and the cost of ordinary OXC increases rapidly.Therefore,it is necessary that several wavelengths are grouped into one waveband to be switched for reducing the cost.This technology is called Waveband Switching(WS).Firstly,this thesis proposes a dynamic multicast multi-granularity mechanism,which based on the multi-granularity IP over WDM optical networks,through integrating the traditional traffic grooming and waveband switching technologies.Then,this thesis designs a model for multicast multi-granularity traffic grooming and a node structure to support multicast multi-granularity traffic grooming.According to the different types of applications for military optical network,this thesis proposes the definition of different types of blocking probability.And two dynamic multicast multi-granularity grooming heuristic algorithms are proposed,which are in order to minimize the blocking probability of requests for multicast multi-granularity traffic grooming.At last,this thesis develops software by VC++6.0 in order to asses the performance of the designed heuristic algorithms.Simulation results show that the designed dynamic multicast multi-granularity traffic grooming algorithms have better performances in reducing the blocking probability and the switching node cost.