IEEE802.16d MAC Protocol Analysis Design And Implementation

Recently, the quantity of cable broadband access subscriber has been growing fast, and the data services requirements from the users are hugeness. However, the services capacity of the telecom operators is limited because of the restricted coverage, equipments and environment. Broadband wireless access can be used to remedy the deficiency of cable network. WLAN technologies have been employed widely. People need larger coverage, higher data rate and better quality of service, so IEEE802.16 technologies arises at the historic moment. It belongs to Wireless Metropolis Area Network technologies. Its peak data rate could be 75 Mbps, and the radius of the coverage could be 48 km. It is the solution for the "last mile" problem in broadband access.Based upon the air interface standard for fix broadband wireless access system IEEE802.16d, Media Access Control (MAC) layer protocol is analyzed in detail; the whole MAC protocol process is implemented by software design; the testing and verifying of the whole MAC protocol is performed on the Wi-MAX demo system.The IEEE802.16d MAC protocol process is analyzed in detail, including network topology, protocol stack hierarchical model, frame structure and access mode. The MAC protocol can be divided into control panel and data panel in functions, the key common part sublayer protocol process is designed and implemented, such as system initializing, periodic ranging, bandwidth allocation, connection building and maintaining, data transmission and ARQ process. The whole software design contains Base Station(BS) part and Subscriber Station(SS) part and very detailed design plan is given, such as detailed software flow chart and program structural drawing.The platform implementation plan of IEEE802.16d MAC protocol is given, the interface between MAC layer and physical layer is designed. The parallel development and combined debugging between MAC layer and PHY layer are completed. Finally, the whole process that a audio file can be transmitted from the base station to the subscriber station though our Wi-MAX demo system is implemented successfully.