Research On MEC Deployment And Service Request Scheduling Of Integrated Satellite And Terrestrial Network

The integrated satellite and terrestrial networks can achieve seamless global coverage,and Mobile Edge Computing(MEC)enables users to obtain computing services anywhere nearby.The deployment of MEC in the integrated satellite and terrestrial networks can provide all-weather stable and reliable communication guarantees for space-based and land-based users.The network can also meet users' Qo S requirements of high speed and low latency.However,the rapid movement of satellite network nodes and the frequent switching of links lead to real-time changes in topology.Due to the limited network resources of the satellite network,it may lead to conflicting service requests.According to the above requirements,a method for the service request scheduling of satellite integrated MEC is proposed.The key idea is to deploy the service on the MEC and schedule the user's request to the node that has deployed the requested service.In order to further complete the transmission of user requests,considering that the current mainstream multi-layered satellite constellation can greatly improve the performance of the satellite network,the routing scheduling algorithm of the multilayered satellite network is proposed.The details are as follows:In order to realize the effective utilization of various resources within the network and system,this thesis proposes a method to jointly solve the service deployment and request scheduling problems of satellite MEC computing nodes.This thesis models the problem as an optimization problem,a mixed-integer linear problem.The optimization goal is to minimize the transmission cost while reducing the proportion of unsatisfied services when deploying services on MEC nodes.In order to avoid overloading some nodes while others are underutilized,this thesis modifies the above model and sets an upper limit on the load that each satellite node can support.Through simulation experiments,this thesis verifies that this scheme has a significant improvement in the proportion of service users and computing resource utilization compared with the greedy placement scheme of the benchmark mechanism.This thesis researches the routing transmission algorithm of multi-layered satellite networks in order to complete the transmission of user service requests and avoid the limitations of routing performance and convergence on single-layered low earth orbital satellites.Due to the complexity of multi-layered satellite networks,this thesis uses the idea of multi-layered satellite routing(MLSR)for grouping management.In order to prevent network congestion,a traffic monitoring mechanism is introduced in this thesis.And in order to avoid the influence of frequent link switching on routing decisions,this thesis proposes a location-based routing addressing mechanism for a multilayered satellite network(LA-MLSR)using the known satellite operating locations.This thesis compares LA-MLSR,MLSR and relative position based on in-terface selection algorithm(RP-ISA)through simulation experiments.The experimental results show that LA-MLSR has better performance in terms of routing overhead,delay,packet loss rate,and network congestion.