CSE 6392 Mobile Computer Systems Lecture 2 : Mobile and Wireless - - PowerPoint PPT Presentation

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May 23, 2023 382 likes •760 views

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

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8/20/2002 Kumar 1

CSE 6392 Mobile Computer Systems

Lecture 2 : Mobile and Wireless

Networks With Dr. Mohan Kumar

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8/20/2002 Kumar 2

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

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Mobile and Wireless Networks

What are mobile networks? What are wireless networks?

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Wireless Networks

Limited channel capacity

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Wireless Networks

Limited channel capacity Higher noise and interference

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Wireless Networks

Limited channel capacity Higher noise and interference Frequency allocation restrictions

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Wireless Networks

Limited channel capacity Higher noise and interference Frequency allocation restrictions Information is transmitted through free space

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Mobile Network functions

Maintaining communication despite mobility

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Mobile Network functions

Maintaining communication with mobility Keeping track of locations

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Wireless network functions

Provide wireless interfaces to users

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Wireless network functions

Provide wireless interfaces to users Bandwidth allocations and error control

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MAC protocols

FDMA

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MAC protocols

FDMA TDMA

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MAC protocols

FDMA TDMA CDMA

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MAC protocols

FDMA TDMA CDMA GSM

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Emerging Mobile and Wireless Networks

Wireless LANs Wireless Loops Satellites Wireless ATM Cellular/PCS

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Wireless LANs

For small areas such as a building, hallway, park or office

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Wireless LAN standards

IEEE 802.11

1 Mbps is being enhanced to 11 Mbps

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Wireless LAN standards

IEEE 802.11

1 Mbps Physical media can be infrared or spread spectrum

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Wireless LAN standards

IEEE 802.11

1 Mbps Physical media can be infrared or spread spectrum Prioritized access to the medium

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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

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Wireless LAN standards

IEEE 802.11(Contd..)

Many universities and companies use 802.11 WLAN

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Wireless LAN standards

HIPERLAN

23.5 Mbps

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Wireless LAN standards

HIPERLAN

23.5 Mbps Physical media is spread spectrum

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Wireless LAN standards

HIPERLAN

23.5 Mbps Physical media is spread spectrum Prioritized access to the medium

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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

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Wireless Networks

Wireless local loops LMDS

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Wireless Networks

Wireless local loops Satellites

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Satellites

Iridium

A LEO system which uses 66 satellites to provide mobile communications.

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Wireless ATM

ATM cell transmitted over wireless channels.

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Wireless ATM

Advantages

Seamless interconnection with backbone ATM networks

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Wireless ATM

Advantages:

Seamless interconnection with backbone ATM networks Support for QoS in wireless networks

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Wireless ATM

Advantages:

Seamless interconnection with backbone ATM networks Support for QOS of wireless and mobile users Suitability of small packets over wireless channels.

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Wireless ATM

Challenges

Maintaining end-to-end ATM connections as the user moves

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Wireless ATM

Challenges

Maintaining end-to-end ATM connections as the user moves

Connection re-routing needs to be performed

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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