Simulation Platform Design And Performance Analysis On C-DOCSIS MAC Protocol

The HFC network(Hybrid Fiber Coax Network) used in the cable television systems is gaining continuous attention due to the characteristics of easy to realize bidirectional transmission and large transmission capacity. The DOCSIS (Data-Over-Cable Service Interface Specifications) series standard designed based on HFC networks is widely used in Northern America on account of the advantages on high communication rate, supporting a variety of business and configuration management ability. In order to adapt to the domestic application scenarios and business needs, our country put forward C-DOCSIS(China-DOCSIS) on the basis of DOCSIS, which inherits the technical advantages and technology assets of HFC+DOCSIS and simplifies partial channel technology.The job of this thesis is to study the simulation platform design and performance analysis on C-DOCSIS MAC protocol. Firstly, the knowledge of network structure, protocol stack and physical layer processing flow of C-DOCSIS protocol are introduced respectively, then the MAC layer frame structure, data transmission mechanism(including channel bonding and competition mechanism) and protocol encapsulation mode are analyzed. Secondly, On the basis of what mentioned above, the C-DOCSIS MAC layer protocol simulation platform is designed and an event-based simulation platform architecture and several function modules are realized such as statistics, packet transmission and receiving, queue management and channel assignment. Further more, a MAC protocol mechanism based on this platform is simulated, a variety of test scenarios are designed in order to test and analyze the performance such as throughput, delay and jitter of the protocol.