Topology Discovery And Multi-controller Load Balancing Simulation For Software Defined Mobile Ad Hoc Networks

Software Defined Mobile Ad Hoc Network(SDMANET)combines Software Defined Network(SDN)and Mobile Ad Hoc Network(MANET),and has the characteristics of self-organization without center,no need to rely on infrastructure,and separation of forwarding and control.At present,there are software simulation platforms that support simulation SDMANET,and researchers can directly deploy the research content to the simulation platform to verify their research results.Secondly,the centralized control mode of SDN makes the load pressure of the control plane greater,and there are currently multi-controller load balancing algorithms that can reduce the load of a single controller and improve the performance of the control plane.However,current software simulation platforms cannot fully simulate the real SDMANET network environment,and the simulated network environment will be affected by software performance.In addition,the existing multi-controller load balancing algorithm cannot be applied to SDMANET,which has a rapidly changing topology,and cannot ensure the normal connection between the switch and the controller.This thesis focuses on SDMANET to study the simulation platform and multicontroller load balancing algorithm,and implements the corresponding simulation functions.Firstly,this thesis builds a MANET based on embedded devices and deploys the SDN architecture to the MANET,so as to realize the construction of a simulated SDMANET environment based on embedded devices.This thesis redesigns the topology discovery mechanism in the existing software simulation platform,and implements the topology discovery function suitable for building SDMANET based on embedded devices by modifying the source code of SDN switch and SDN controller.Secondly,this thesis jointly controls link quality,load balancing degree,switch position and movement speed to propose a multi-controller load balancing algorithm for SDMANET,which ensures that the switches in SDMANET can be effectively managed by the controller.This thesis extends the existing software simulation platform to simulate the quality of wireless control links,and then implements the multi-controller load balancing algorithm based on this platform through the information collection module,multi-controller synchronization module,migration decision module and switch migration module.Finally,this thesis analyzes the traditional switch migration mechanism,optimizes it for SDMANET under the premise of ensuring activity and security,and implements the optimized switch migration mechanism based on the existing software simulation platform.