Wimax宽带无线接入技术(英文版).ppt

1.What is WiMAX? Worldwide Interoperability for Microwave Access (WiMAX) is the common name associated to the IEEE 802.16 standards. These standards are issued by the IEEE 802.16 subgroup that originally covered the Wireless Local Loop technologies with radio spectrum from 10 to 66 GHz. 2. IEEE 802.16x -- Introduction 4.1 Service Specific Convergence Sublayer (CS) CS sub-layer is mainly responsible for the completion of external network data between the data and the CPS sub-layer mapping. It all from the convergence layer service access point (CS SAP) received external data into the network and mapped to MAC SDU, and through the MAC Service Access Point (MAC SAP) sent to the CPS sub-layer. In this process, CS sub-layer on the external network data classify them with the appropriate MAC service flow ID and the connection identifier CID SFID the association, and also perform load header compression PHS. 4.2 MAC Common Part Sublayer(CPS) CPS sub-layer provides the core MAC layer functions, including system access, bandwidth allocation, connection establishment and maintenance etc. CPS sub-layer through the MAC SAP CS from different sub-layer receives the data, the formation of MAC SDU. MAC SDU can be split, but also with the other one or more MAC SDU into a new MAC PDU, according to classification of MAC connections to ensure QoS. 4.3 Privacy Sublayer(PS) MAC layer contains a separate optional security sub-layer to provide authentication,key exchange and encryption. 802.16 by encrypting the connection between the PS and BS provide confidential access to the fixed broadband wireless network capacity, in addition to the relevant BS traffic through encrypted against unauthorized access, and gave operators a powerful anti-theft functions. OFDM physical layer support for frame-based transmission. One contains a downlink subframe and an uplink sub-frame. OFDM physical layer support for frame-based transmission. One contains a downlink subframe and an uplink sub-frame. Uplin