Wireless link layers (contd)
IEEE 802.11
- Wireless LANs: 1-2 Mbps.
- Defines a set of transceivers which interface between wireless/wired
- Link layer protocols make entire network of transceivers appear as one link at network layer => mobility in 802.11 invisible to IP
- Changing router boundaries => interrupts communications => need to support mobile IP
Mobile IP: independent of link layer technology
Goal: “seamless” roaming.
- Radio LAN connections in premises
- Cellular telephone for out-of-range