Research And Simulation Of MAC Layer Mechanism In HINOC Broadband Access System

After nearly twenty years of rapid development in China,the construction of all aspects of society has been basically mature,especially in the network construction.At present,the optical fiber of backbone network has been basically realized in our country,so the "last 100 meters" technology scheme of entering the house into the building has become the key to the development of wired network.Nowadays,there are many kinds of mainstream broadband access media,among which coaxial cable occupies the mainstream position in China’s broadband access media because of its good service quality,effective anti-interference ability,rich channel resources and other advantages,and has been laid in a large range of domestic.Therefore,the development of coaxial broadband admission technology on the one hand can meet the increasingly rich needs of people,on the other hand can reduce the cost to the minimum.At present,China has completely independently designed and released the High performance Network Over Coax(HINOC)access technology.After nearly ten years of development,the admission rate of this technology can reach gigabit level,and the core chip in the equipment is completely designed and produced by China.With the rapid updating of foreign broadband admission technology,HINOC broadband admission technology must be upgraded to maintain the competitiveness at home and abroad.Therefore,this research group focuses on the coaxial broadband admission technology of 10 gigabit level.The main contents of this thesis are as follows:analyzing the deficiency of node admission and link maintenance mechanism in HINOC 3.0 standard,designing and realizing the optimization solution of node admission and link maintenance mechanism against the deficiency,proposing the admission and link maintenance mechanism of new node equipment in HINOC network under the condition of binding multi-channel;The main operating mechanism,node admission and link maintenance mechanism,event flow manager and MAC layer function module in HINOC simulation platform are designed and implemented.In this simulation platform,the transmission function of signaling frame and control frame,channel scheduling mechanism and a variety of node admission schemes are tested,and the correctness and feasibility of channel scheduling module and node admission optimization scheme in the simulation platform proposed and designed in this thesis are verified by analyzing and comparing the simulation test results.When designing the node admission scheme,firstly,a comparative analysis is made on HINOC 3.0 and HINOC 2.0,and its design requirements are proposed and designed according to the deficiencies of the existing node admission mechanism.Aiming at the deficiency of existing static competition mechanism and combining with the characteristics of HINOC network,a dynamic competition mechanism based on unknown number of nodes is designed and implemented.By using this scheme,the protocol mechanism can be better combined with the actual network,so that the central node in the network can predict the current nodes waiting to accept the competition according to the known conditions,and then select the corresponding competition length according to the node estimate.Then,according to HINOC 3.0 protocol,the signaling interaction process accepted by nodes is analyzed and designed.By independently analyzing the upstream and downstream states,the signaling interaction process of HINOC 3.0 node admission process is designed and implemented.In the design of the simulation platform,according to the requirements of HINOC 3.0 protocol,the key operating mechanism,event flow manager and MAC layer related functional modules of the simulation platform are designed and implemented.The MAC layer related functional modules are mainly designed and implemented for its admission control module.It includes channel scheduling generation module,channel scheduling resolution module,control frame and signaling frame group frame resolution module,control frame and signaling frame input and output module.In the test and verification of the simulation platform of MAC layer,the transmission module of signaling frame and control frame is simulated first,the main purpose is to ensure the correct operation of the simulation platform.Followed by setting the simulation scenario for the proposed based on the number of unknown nodes of acceptance and the static competition mechanism and HINOC 2.0 acceptance mechanism simulation test,through contrast analysis of the theoretical results and simulation test results verify the effectiveness of the proposed in this thesis based on the number of unknown nodes of dynamic competition mechanism and accept the validity and feasibility of signaling interaction;Finally,two channel scheduling algorithms,uniform allocation and on-demand allocation,are used to simulate the channel scheduling module in the platform.The correctness and effectiveness of the channel scheduling module designed and implemented in the simulation platform are verified by comparing the theoretical results and simulation results.