Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer...
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Transcript of Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer...
![Page 1: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/1.jpg)
Ch0:1Tseng:WirelessNet
Chapter 0:Chances of Wireless Communications
Yu-Chee Tseng
Dept of Computer Science and Information Engr.
National Chiao-Tung University
![Page 2: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/2.jpg)
Ch0:2Tseng:WirelessNet
Wireless Network Architectures
![Page 3: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/3.jpg)
Ch0:3Tseng:WirelessNet
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Ch0:4Tseng:WirelessNet
Wireless Network Models
With Infrastructure: Without Infrastructure (ad hoc networks):
![Page 5: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/5.jpg)
Ch0:5Tseng:WirelessNet
Cellular: Infrared:
![Page 6: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/6.jpg)
Ch0:6Tseng:WirelessNet
無線隨意網路( Multi-hop Ad Hoc Network )
Laptop
PDA
LaptopLaptop
Laptop
A
B
C
D
E
PDA
Laptop
Laptop
Laptop
PDA
PDA
C'
![Page 7: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/7.jpg)
Ch0:7Tseng:WirelessNet
感測網路( Sensor Network )
![Page 8: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/8.jpg)
Ch0:8Tseng:WirelessNet
Bluetooth Technology
![Page 9: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/9.jpg)
Ch0:9Tseng:WirelessNet
Applications of Wireless Communications
![Page 10: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/10.jpg)
Ch0:10Tseng:WirelessNet
Mobile Computing
Wireless Communication Technology
Portable Computer Technology appearance of light-weight computing devices
Vision: Ubiquitous Computing / Nomadic Computingcomputers everywhere; information anywhere anytime
![Page 11: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/11.jpg)
Ch0:11Tseng:WirelessNet
Features of Wireless Communication
one global bandwidth shared by all users fortunately channels, such as (frequency, time-slot) pairs, can be reuse
d Radio-based
low bandwidthhigh latency radio communication linkshigher bit error rate (BER)
fading short-term multipath fading (Rayleigh effect)
due to same signal taking different paths and arriving at the receiver shifted in phase
long-term fading (radio shadow) topology of the terrain (like mountains) can cause signal dropouts solution: deploying multiple antenna sites
![Page 12: Ch0:1 Tseng:WirelessNet Chapter 0: Chances of Wireless Communications Yu-Chee Tseng Dept of Computer Science and Information Engr. National Chiao-Tung.](https://reader036.fdocuments.in/reader036/viewer/2022062516/56649e025503460f94aeca10/html5/thumbnails/12.jpg)
Ch0:12Tseng:WirelessNet
Features of Portable Computers
Limited resources: limited energy (battery life) limited CPU speed limited memory
Less reliable, less secure
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Ch0:13Tseng:WirelessNet
Mobile System Architecture
Cellular-based Ad hoc Relaying link Wireless ATM Packet Radio Network Sensor Networks
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Ch0:14Tseng:WirelessNet
Mobile Computing Applications/Services
Wireless information services: Pico-service: local parking lot availability, layout of a buildi
ng Micro-service: train and bus station information, local traffic
information Macro-service: weather information, local news service Wide Area Service: stock market information
Real-time multimedia applications tele-medicine tele-computing collaborative environments
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Ch0:15Tseng:WirelessNet
Research: Hardware Aspects
power saving display, LCDlow-voltage CPUs
AT&T's Hobbit chip: 5,000 times less power consumption in doze mode than active mode
radio: IEEE 802.11 power consumption example:
transmit: 1400 mW receive: 1000 mW idle: 830 mW sleep: 130 mW
size, user interface (wearable computers)
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Ch0:16Tseng:WirelessNet
Research: Software Aspects
mobile communication protocolsWAPwireless TCPMobile IPMAC protocols
Energy-efficient protocolrelated to the above send/receive/idle/sleep model
... and many others
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Ch0:17Tseng:WirelessNet
Research: Algorithmic Aspects
Bandwidth saving Data caching for broadcast channel allocation communication scheduling math. analysis