Design And Implementation Of Mobile Communication Core Network Load Simulation System Based On IP

NGN (Next Generation Network) development has become the generaltrend. With the development of Next Generation Network, mobilecommunications has seen tremendous changes in network architecture andtransmission mode. Soft-Switch is going to play a core role in the call andcontrol of next generation network and IP has become a major means oftransmission. Under the new structure and the means of transmission, thenetwork paralysis occurred due to impact of big traffic. So need a new studyof the quality of the communication network, especially the method to thecase. There are a lot of new issues in the deployment of network load,network optimization, etc. This paper studies the quality of mobil ecommunications based on IP by means of core network simulation.Signaling is the control signal transmission between communicationsequipment, such as occupation, busy, leisure, etc. Mobile Communicationis the NO.7 Signaling System. IP-based SS7(NO.7 Signaling System)protocol stack used SCTP by the bottom of it. This paper studies many newfeatures of SCTP protocol, such as: Multi -homing, Multi-streaming,Heartbeat mechanism, etc.Input of Load Simulator is a large number of users call or locationupdating, which is a lot of random events. This paper studies the typicalmathematical model of location call and updating. Call flow is the Poissonprocess model. Location updating has the group mobile model, theindividual mobile model, the time presence m odel and the trajectory model.The work mechanism of Load Simulation System is a messageprocessor, the constant messages processing. Use the design of finite statemachines to process messages .and the means of design: each receiving arequest message, System will produce a new logical thread. The logicalthread is suspended and set a new status after processing message. At thesame time, it starts a timer, waiting for the response of the equipmentreceiving the messages. when the timer overtime s or it has received theresponse, the thread run again. System simulation timers use a logic timer technology. Each speciallogical system clock, managing timer function will scan all timers. If a timeris not overtime, it will reduce special value to represent a sp ecial time. If itovertimes, system will run the corresponding logical thread to process thiscase.In this paper, the load simulation system is based on IP, so IPsimulation is crucial to the simulation results. This paper analyses the datatransmission rules and congestion control. The data transmission involveshow to establish the data transmission couple, how to close the couple oftransmission, and how to avoid deadlock. Congestion Control containsdetailed algorithm analysis and implementation of th e slow start, thecongestion avoiding and the rapid retransmission.Load simulation can be used to analyze real mobile networkcommunications quality under different load conditions. Early foundpotential dangers of network in the future and eliminate it. It also can beused to adjust parameters of network optimization to achieve furtheroptimization of the network load. There is a certain economic value.In addition, there is a certain theoretical study value. This mathematicalmodel of mobile telecom traffic can be referenced as the other areasresearch foundation about it. And the introduction of logical thread andlogic timer is meaning in the design of other reference. The details of thealgorithm and the realization of SCTP protocol have great referen ce valuefor work or study in this field. The system is also able to verify some of thecore network congestion algorithms, to found problems in advance to avoidproblems left over to the network and avoid leading to a greater loss.