清华大学：无线网和移动网（PPT课件讲稿）Mobile and wireless network

Mobile and wireless network Dan lI CS Department, Tsinghua University 2021-129 1

Mobile and wireless network 2021-1-29 1 Dan LI CS Department, Tsinghua University

Todays Lecture Introduction and Challenges Internet Mobility IPv6 Mobility Support Ad hoc Network Mobile system Framework Rethinking about Mobility Reading List 2021-129

Today’s Lecture ß Introduction and Challenges ß Internet Mobility ß IPv6 Mobility Support ß Ad hoc Network ß Mobile System Framework ß Rethinking about Mobility ß Reading List 2021-1-29 2

Goal of Wireless Networking and Mobile computing People and their machines should be able to access information and communicate with each other easily and securely, in any medium or combination of media -voice data, image, video, or multimedia -any time, anywhere, in a timely, cost-effective way Dr. G.H. heilmeier, Oct 1992 2021-129

Goal of Wireless Networking and Mobile Computing “People and their machines should be able to access information and communicate with each other easily and securely, in any medium or combination of media – voice, data, image, video, or multimedia – any time, anywhere, in a timely, cost-effective way.” Dr. G. H. Heilmeier, Oct 1992 2021-1-29 3

Enabling Technologies Development and deployment of wireless/mobile technology and infrastructure in-room in-building. on-campus, in -the-field, man WaN Miniaturization of computing machinery - PCs->laptop-> PDAS/smart phones-> embedded computers/sensors Improving device capabilities/ software development environments, e.g andriod:http://code.google.com/android/ iphone: htt p: //developer. apple. com/iphone/ * windows mobile 2021-129

Enabling Technologies ß Development and deployment of wireless/mobile technology and infrastructure Þ in-room, in-building, on-campus, in-the-field, MAN, WAN ß Miniaturization of computing machinery . . . -> PCs -> laptop -> PDAs/smart phones -> embedded computers/sensors ß Improving device capabilities/software development environments, e.g., Þ andriod: http://code.google.com/android/ Þ iphone: http://developer.apple.com/iphone/ Þ windows mobile 2021-1-29 4

Pervasive Use of mobile wireless Devices There are 4 billion mobile phones Over 50 countries have mobile phone subscription penetration rates higher than that of the population (Informa 2007) *http://en.wikipediaorg/wiki/mobile_phone_penEtra tion rate The mobile device will be the primary connection tool to the Internet for most people n the world in 2020 PEW Internet and American Life Project, Dec 2008 2021-129 5

Pervasive Use of Mobile Wireless Devices ß There are ~4 billion mobile phones Þ Over 50 countries have mobile phone subscription penetration rates higher than that of the population (Infoma 2007) Þ http://en.wikipedia.org/wiki/Mobile_phone_penetra tion_rate ß The mobile device will be the primary connection tool to the Internet for most people in the world in 2020. PEW Internet and American Life Project, Dec. 2008 2021-1-29 5

At Home WiFi satellit WiFi 802.11g/n e WiFi UWB bluetooth WiFI cellular 2021-129

At Home 2021-1-29 6 WiFi WiFi WiFi cellular bluetooth UWB satellit e WiFi 802.11g/n

At Home Ohttp://www.msnbc.com-msnbcinteractive-ourwirelessfuture-mozillaFirefox-ox 能 OUR WIRELESS FUTURE M E N U Done 2021-129 Sourcehttp://teacher.scholastic.com/activities/science/wireless_interactives.htm

At Home 2021-1-29 7 Source: http://teacher.scholastic.com/activities/science/wireless_interactives.htm

At Home: last-Mile Intemet Many users still don't have Bus Stop broadband Gas Stat reasons: out of service area some consider expensive Broadband speed is still limited DSL: 1-6 Mbps download Mesh Rouer 5 and 100-768Kbps upload Mesh Router 2 Cable modem: depends on Mat route your neighbors lesh router f and Device Insufficient for several 级 to Router1) applications(e.g, high-quality video streaming 2021-129

At Home: Last-Mile ß Many users still don’t have broadband Þ reasons: out of service area; some consider expensive ß Broadband speed is still limited Þ DSL: 1-6 Mbps download, and 100-768Kbps upload Þ Cable modem: depends on your neighbors Þ Insufficient for several applications (e.g., high-quality video streaming) 2021-1-29 8

On the move Weather Forecast ECG Tilt sensor Motion sensor I Personal GPRS Network Server Bluetooth Motion or WLAN ledical Server network coordinator temperature/ 20Souege:http://www.ece.uah.edu/jovanov/whrms/

On the Move 2021-1-29 9 Source: http://www.ece.uah.edu/~jovanov/whrms/

On the road GSM/UMTS cdmaOne/cdma2000 WLAN. GPS DAB. TETRA road condition weather, location-based services emergency 2021-129

On the Road 2021-1-29 10 ad ho GSM/UMTS, c cdmaOne/cdma2000, WLAN, GPS DAB, TETRA, ... road condition, weather, location-based services, emergency