计算机网络：自顶向下 配套PPTChapter_7_V7.0.pptx

Computer Networking: A Top Down Approach ;Ch. 6: Wireless and Mobile Networks;Chapter 7 outline;Elements of a wireless network;;;;Characteristics of selected wireless links;;;Wireless network taxonomy;Chapter 7 outline;Wireless Link Characteristics (1);Wireless Link Characteristics (2);Wireless network characteristics;Code Division Multiple Access (CDMA);CDMA encode/decode;CDMA: two-sender interference;Chapter 7 outline;IEEE 802.11 Wireless LAN;802.11 LAN architecture;802.11: Channels, association;802.11: passive/active scanning;IEEE 802.11: multiple access;IEEE 802.11 MAC Protocol: CSMA/CA;Avoiding collisions (more);Collision Avoidance: RTS-CTS exchange;frame control;;frame control;802.11: mobility within same subnet;802.11: advanced capabilities;power management node-to-AP: “I am going to sleep until next beacon frame” AP knows not to transmit frames to this node node wakes up before next beacon frame beacon frame: contains list of mobiles with AP-to-mobile frames waiting to be sent node will stay awake if AP-to-mobile frames to be sent; otherwise sleep again until next beacon frame ;;Chapter 7 outline;;Cellular networks: the first hop;;3G (voice+data) network architecture;;;4G: differences from 3G;Functional split of major LTE components;Radio+Tunneling: UE – eNodeB – PGW;Quality of Service in LTE;Chapter 7 outline;What is mobility?;;Mobility: more vocabulary;How do you contact a mobile friend:;Mobility: approaches;Mobility: approaches;;Mobility via indirect routing;Indirect Routing: comments;Indirect routing: moving between networks;;Mobility via direct routing: comments;;Chapter 7 outline;Mobile IP;;Mobile IP: agent discovery;Mobile IP: registration example;;Handling mobility in cellular networks;;;;;;;Mobility: cellular versus Mobile IP;Wireless, mobility: impact on higher layer protocols;Chapter 7 summary