- Taipei Model
- Bay Area Model
- Philadelphia Model
802.11 Protocol
- 802.11b/a/g/n
- 802.11 MAC (pp. 2-88~2-107)
- 802.11 PCF & DCF
802.11 RTS & CTS
802.11 QoS - animations (two Applets about CSMA/CA Simulations)
Industry & Products
Sunday, February 26, 2006
802.11
802.11 Metropolitan Wireless Business Models
802.11 Protocol
Industry & Products
802.11 Protocol
Industry & Products
Mobile Internet
cellular handsets:
PHY: All digital
Signaling:
SMS, Short Message Service, up to 160 bytes
SMS, EMS use control channels while MMS use regular channels shared by data and voice.
Media Access: TDMA for multiplexing, using one of 8 time slots repeatedly
GSM, Circuit Switching, 9.6 (*2), 12.4(*2, HSCSD)
GPRS, General Packet Radio Services, Packet Switching, 9.05 kbps/13.4 kbps (*1,2,3,4)
WAP, content bearer protocol, certificate, cookies
WML, wireless markup language (or HTML-C as in i-Mode, XHTML)
MMS, Multimedia Messaging Service
Tariff
GPRS vs. GSM
pricing based on data volume or air time
Business Issues:
Will MMS make a hit?-
Function Integration
1. Fundamental questions: Do people like Swiss Army Knife? Video phone,
Recorder-TV,
British Royal Navy Sea Harrier (http://www.targetlock.org.uk/seaharrier/)
Format convergence products
2. DVD-Combo, DVD/VCD/CD
3. Card Reader, SD/SMC/MMC/CF
Advanced Applications
Positioning, LBS, GPS required for high precision
Security features
WIM: A Wireless Identity Module (WIM) can contain
both trusted and client certificates, private keys
and algorithms needed for WTLS handshaking,
encryption/decryption and signature generation.
The WIM module can be placed on a SIM card
and is then referred to as a SWIM card.
Social Issues:
base stations in communities
Near Fields
3G Technology Trends
Spread Spectrum: CDMA vs. TDMA (so called 3G)
MMS business issues
1. archiecture of MMS delivery systems
2. comparison to Internet
Principles of SS
1. from FDMA, TDMA to CDMA
2. related applications: IS-95, W-CDMA, 802.11
authentication and billing of wlan with SIM card
1. authentication
2. billing
3. coverage of both 802.11 & GPRS/3G
4. roaming across APs and WISPs
5. user base
PHY: All digital
Signaling:
SMS, Short Message Service, up to 160 bytes
SMS, EMS use control channels while MMS use regular channels shared by data and voice.
Media Access: TDMA for multiplexing, using one of 8 time slots repeatedly
GSM, Circuit Switching, 9.6 (*2), 12.4(*2, HSCSD)
GPRS, General Packet Radio Services, Packet Switching, 9.05 kbps/13.4 kbps (*1,2,3,4)
WAP, content bearer protocol, certificate, cookies
WML, wireless markup language (or HTML-C as in i-Mode, XHTML)
MMS, Multimedia Messaging Service
Tariff
GPRS vs. GSM
pricing based on data volume or air time
Business Issues:
Will MMS make a hit?-
Function Integration
1. Fundamental questions: Do people like Swiss Army Knife? Video phone,
Recorder-TV,
British Royal Navy Sea Harrier (http://www.targetlock.org.uk/seaharrier/)
Format convergence products
2. DVD-Combo, DVD/VCD/CD
3. Card Reader, SD/SMC/MMC/CF
Advanced Applications
Positioning, LBS, GPS required for high precision
Security features
WIM: A Wireless Identity Module (WIM) can contain
both trusted and client certificates, private keys
and algorithms needed for WTLS handshaking,
encryption/decryption and signature generation.
The WIM module can be placed on a SIM card
and is then referred to as a SWIM card.
Social Issues:
base stations in communities
Near Fields
3G Technology Trends
Spread Spectrum: CDMA vs. TDMA (so called 3G)
MMS business issues
1. archiecture of MMS delivery systems
2. comparison to Internet
Principles of SS
1. from FDMA, TDMA to CDMA
2. related applications: IS-95, W-CDMA, 802.11
authentication and billing of wlan with SIM card
1. authentication
2. billing
3. coverage of both 802.11 & GPRS/3G
4. roaming across APs and WISPs
5. user base
Features of Skype
1. peer to peer, no server required, therefore, no operation cost like cellular communications
2. overlay, not relying on existing Internet protocols beyond Layer 4, resilient to malfunctions of Internet services
3. scalable, using supernodes among every 500 nodes, adaptive to constant configuration changes
4. high quality codec for crystal voice
5. strong penetration to NAT and firewalls
6. free for now and maybe forever for on-net calls
7. implementation of packet voice
8. consumes reasonable bandwidth, consumes significant CPU
9 . teleconference, voice communications for 5 parties at most
10. millions people online all the times, number keep rising.
11. provide presence like messengers, great feature compared to old phones
2. overlay, not relying on existing Internet protocols beyond Layer 4, resilient to malfunctions of Internet services
3. scalable, using supernodes among every 500 nodes, adaptive to constant configuration changes
4. high quality codec for crystal voice
5. strong penetration to NAT and firewalls
6. free for now and maybe forever for on-net calls
7. implementation of packet voice
8. consumes reasonable bandwidth, consumes significant CPU
9 . teleconference, voice communications for 5 parties at most
10. millions people online all the times, number keep rising.
11. provide presence like messengers, great feature compared to old phones
Saturday, February 25, 2006
Wireless Metropolitan Services
–遠端照護
–無障礙設施(行動導盲)
–垃圾車提示
–路邊停車
–環保稽查
–到院前照護(急救、病例、生理數據)
–民眾上網費用收入
–民眾VOIP費用收入
–婦女夜間乘車安全監控
–學童安全
–汽車、貴重物品監控
定位廣告推播費用
•學童安全
Homework 2-25-2006
停課公告: 因為外出開會, 三月四日停課一次
1. Read the article Paging (and Tracking) Dr. Wi-Fi.
Write down the abstract.
2. Propose 1~3 wireless services that can be depolyed on motropolitan wireless networks. What kind of business model is there?
如果你的作業引用他人文章, 務必註明出處或是網址, 以示尊重他人創作.
References:
1. Wireless Metropolitan Services
2. 學童安全
3. 婦女夜間乘車安全監控
4. 汽車、貴重物品監控
5. Wireless Health Care
1. Read the article Paging (and Tracking) Dr. Wi-Fi.
Write down the abstract.
2. Propose 1~3 wireless services that can be depolyed on motropolitan wireless networks. What kind of business model is there?
如果你的作業引用他人文章, 務必註明出處或是網址, 以示尊重他人創作.
References:
1. Wireless Metropolitan Services
2. 學童安全
3. 婦女夜間乘車安全監控
4. 汽車、貴重物品監控
5. Wireless Health Care
Friday, February 24, 2006
2-25-2006 Trend Observation
Dual Mode Handset
Wireless for health care
Voice over Wi-Fi
Location Based Services
What I saw in Seoul in Jan. 2006. Coex,
Metro
Wireless for health care
Voice over Wi-Fi
Location Based Services
What I saw in Seoul in Jan. 2006. Coex,
Metro
Dual Mode Handset
Nokia Launches Dual-Mode 6136 Flip PhoneWi-Fi Cell Phone T-Mobile Ready
1. With voice revenue slowly declining, operators are looking towards content to make up the difference.
2. They're banking on dual-mode convergence as one tool to do so.
3. The additional bandwidth of a Wi-Fi network should encourage mobile subscribers to use more data services, such as Web, e-mail, MMS, music, video, handset TV, etc."
1. With voice revenue slowly declining, operators are looking towards content to make up the difference.
2. They're banking on dual-mode convergence as one tool to do so.
3. The additional bandwidth of a Wi-Fi network should encourage mobile subscribers to use more data services, such as Web, e-mail, MMS, music, video, handset TV, etc."
Thursday, February 23, 2006
Issues of Voice over Wi-Fi
1. 802.11 QoS
absence—until very recently—of a standards-based solution for prioritizing
2. Fast Hand-off between APs
re-authentication between APs takes time such that voice suffers.
Product Solution : "UltraThin" access points (APs) & packet-by-packet micro-management of multiple data streams means that adjacent APs are never broadcasting at the same time
segregate different types of traffic (e.g., voice and data) on different radios, completely eliminating the 'contention' issue or need to prioritize traffic
background: Wi-Fi—802.11b and 802.11g—there are only three non-overlapping channels
absence—until very recently—of a standards-based solution for prioritizing
2. Fast Hand-off between APs
re-authentication between APs takes time such that voice suffers.
Product Solution : "UltraThin" access points (APs) & packet-by-packet micro-management of multiple data streams means that adjacent APs are never broadcasting at the same time
segregate different types of traffic (e.g., voice and data) on different radios, completely eliminating the 'contention' issue or need to prioritize traffic
background: Wi-Fi—802.11b and 802.11g—there are only three non-overlapping channels
Saturday, February 18, 2006
Homework 2-18-2006
1. Create your own blog
2. Name a city where metropolitan wireless networks are being
deployed. What are the major services in that city?
reference
Bangladesh City Unwires with Sun-Powered Mesh
tip
How to insert a link at the following comment, please use the following HTML code.
2. Name a city where metropolitan wireless networks are being
deployed. What are the major services in that city?
reference
Bangladesh City Unwires with Sun-Powered Mesh
tip
How to insert a link at the following comment, please use the following HTML code.
Design Issues of Wireless Applications
Business models
End user devices (diversified)
Infrastructure
Ecology and value chain
Killer Applications
End user devices (diversified)
Infrastructure
Ecology and value chain
Killer Applications
Create your own blog
1. 至 http://www.blogger.com 申請, 請以你的學號 (g/s開頭) 申請免費帳號。主旨欄請用以下格式 "無線通訊網路作業一"
以加速助教登錄作業成績。
2. 請將你的作業寫在你的 blog, 然後到 課程部落格
當次 Homework 的Comment 登錄你的作業blog網址就可以了.
請勿將作業直接寫在 comment
範例
3. Use Gif verification to prevent vandalism.
4. Set Locale & Time Zone
以加速助教登錄作業成績。
2. 請將你的作業寫在你的 blog, 然後到 課程部落格
當次 Homework 的Comment 登錄你的作業blog網址就可以了.
請勿將作業直接寫在 comment
範例
3. Use Gif verification to prevent vandalism.
4. Set Locale & Time Zone
Syllabus for Spring 2006 Wireless Networks
Textbook
(M) C. Siva Ram Murthy, B. S. Manoj Ad Hoc Wireless Networks: Architectures and Protocols Prentice Hall, 2004. 全華圖書代理進口
Reference
(G) Aura Ganz, Zvi Ganz, Kitti Wongthavarawat Multimedia Wireless Networks, Prentice Hall, 2004.
Behrouz Forouzan TCP/IP Protocol Suite McGraw-Hill, 全華圖書代理進口, 2003.
(F) Behrouz Forouzan (陳中和、吳秀峰翻譯) TCP/IP 協定精要 (TCP/IP Protocol Suite, 2/e) 2004
(W) Wireless Business News Updates: http://www.wifiplanet.com
使用說明
M2.1 表示 Murthy的書第2.1節
學期課程
1. Trends of Internet Applications and Business models
Peer to peer, VoIP, Wi-Fi, WiMax, M-Commerce
Reading Assignments: handout at Wireless Blog
2. Design of Wireless Applications
Location Based Services, Metropolitan Wireless Networks
3. A Perspective of Wired & Wireless Broadband Networks
802.3, ADSL, Cable Modem, T Lines, SONET, Frame Relay, ATM, FTTx,
Reading Assignments: M1.1~ M1.8, Handout to announce
5. OSI Model and TCP/IP Protocol Suite
Layers in the OSI model, TCP/IP protocol suite, addressing
Reading Assignments: M1.9~ M1.12, F2.1~F2.3, F2.5
6. Ad Hoc Wireless Networks
Issues, MAC & Routing
Reading Assignments: M5.1~M5.3, M6.1~M6.9, M7.1~M7.9
Subscribe to:
Posts (Atom)