CSE 6392 Mobile Computer Systems Lecture 2 : Mobile and Wireless Networks With Dr. Mohan Kumar 8/20/2002 Kumar 1
Lesson 2 Topics to be covered in this lesson on Wireless Networks Wireless Network Limitations and Functions MAC Protocols for Wireless Networks Types of Wireless Networks 8/20/2002 Kumar 2
Mobile and Wireless Networks What are mobile networks? What are wireless networks? 8/20/2002 Kumar 3
Wireless Networks Limited channel capacity 8/20/2002 Kumar 4
Wireless Networks Limited channel capacity Higher noise and interference 8/20/2002 Kumar 5
Wireless Networks Limited channel capacity Higher noise and interference Frequency allocation restrictions 8/20/2002 Kumar 6
Wireless Networks Limited channel capacity Higher noise and interference Frequency allocation restrictions Information is transmitted through free space 8/20/2002 Kumar 7
Mobile Network functions Maintaining communication despite mobility 8/20/2002 Kumar 8
Mobile Network functions Maintaining communication with mobility Keeping track of locations 8/20/2002 Kumar 9
Wireless network functions Provide wireless interfaces to users 8/20/2002 Kumar 10
Wireless network functions Provide wireless interfaces to users Bandwidth allocations and error control 8/20/2002 Kumar 11
MAC protocols FDMA 8/20/2002 Kumar 12
MAC protocols FDMA TDMA 8/20/2002 Kumar 13
MAC protocols FDMA TDMA CDMA 8/20/2002 Kumar 14
MAC protocols FDMA TDMA CDMA GSM 8/20/2002 Kumar 15
Emerging Mobile and Wireless Networks Wireless LANs Wireless Loops Satellites Wireless ATM Cellular/PCS 8/20/2002 Kumar 16
Wireless LANs For small areas such as a building, hallway, park or office 8/20/2002 Kumar 17
Wireless LAN standards IEEE 802.11 1 Mbps is being enhanced to 11 Mbps 8/20/2002 Kumar 18
Wireless LAN standards IEEE 802.11 1 Mbps Physical media can be infrared or spread spectrum 8/20/2002 Kumar 19
Wireless LAN standards IEEE 802.11 1 Mbps Physical media can be infrared or spread spectrum Prioritized access to the medium 8/20/2002 Kumar 20
Wireless LAN standards IEEE 802.11 1 Mbps Physical media can be infrared or spread spectrum Prioritized access to the medium Battery conservation for inactive or idle wireless users 8/20/2002 Kumar 21
Wireless LAN standards IEEE 802.11(Contd..) Many universities and companies use 802.11 WLAN 8/20/2002 Kumar 22
Wireless LAN standards HIPERLAN 23.5 Mbps 8/20/2002 Kumar 23
Wireless LAN standards HIPERLAN 23.5 Mbps Physical media is spread spectrum 8/20/2002 Kumar 24
Wireless LAN standards HIPERLAN 23.5 Mbps Physical media is spread spectrum Prioritized access to the medium 8/20/2002 Kumar 25
Wireless LAN standards HIPERLAN 23.5 Mbps Physical media is spread spectrum Prioritized access to the medium HIPERLAN2 provide different levels of quality of service to the applications 8/20/2002 Kumar 26
Wireless Networks Wireless local loops LMDS 8/20/2002 Kumar 27
Wireless Networks Wireless local loops Satellites 8/20/2002 Kumar 28
Satellites Iridium A LEO system which uses 66 satellites to provide mobile communications. 8/20/2002 Kumar 29
Wireless ATM ATM cell transmitted over wireless channels. 8/20/2002 Kumar 30
Wireless ATM Advantages Seamless interconnection with backbone ATM networks 8/20/2002 Kumar 31
Wireless ATM Advantages: Seamless interconnection with backbone ATM networks Support for QoS in wireless networks 8/20/2002 Kumar 32
Wireless ATM Advantages: Seamless interconnection with backbone ATM networks Support for QOS of wireless and mobile users Suitability of small packets over wireless channels. 8/20/2002 Kumar 33
Wireless ATM Challenges Maintaining end-to-end ATM connections as the user moves 8/20/2002 Kumar 34
Wireless ATM Challenges Maintaining end-to-end ATM connections as the user moves Connection re-routing needs to be performed 8/20/2002 Kumar 35
Wireless ATM Challenges Maintaining end-to-end ATM connections as the user moves Connection re-routing needs to be performed Support for quality of service 8/20/2002 Kumar 36
Wireless ATM Challenges Lack of standards Cost and complexity in implementation Amount of overheads 8/20/2002 Kumar 37
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