1 / 14

ELE 2860 H. T. Tsui

ELE 2860 H. T. Tsui. 1. The view of an H. K. Engineer 2 A case study. The World in the Eyes of an Engineer. World scene Regional scene Local scene. GNP. China 1 USA 9 Japan 4 UK 1

nero
Télécharger la présentation

ELE 2860 H. T. Tsui

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ELE 2860H. T. Tsui • 1. The view of an H. K. Engineer • 2 A case study

  2. The World in the Eyes of an Engineer World scene Regional scene Local scene

  3. GNP • China 1 • USA 9 • Japan 4 • UK 1 • Europe 1 • HK 0.15

  4. Ranking on IT • Singapore Taiwan KoreaH.K. Market 10 7 19 23 Infrastructure 13 19 25 18 Government 1 2 15 11 Application (CO) 7 18 12 15 Application ( P) 9 14 1 23 ….. Total 3 9 14 18

  5. A case study: 3G Vs Wi Fi • Wi Fi is a wireless technology which have a data rate 5 times that of 3G • Advantages: • Based on technology in the public domain. • A Wi Fi access point (base station) cost US$ 70 ( cellular one cost more than $ 50,000)

  6. WI- FI (1) In major cities, many hot spot access points can be set up at low cost in cafés, airports, stations. Cheap: HK $ 3 per 10 minutes in Pacific Cafes in H. K. • Access Points : 200 in H. K. • 5,000 in Seoul • Voice over IP

  7. WI- FI (2) • Wi-Fi enabled devices Half the lap top sold have built in or add on wi-fi Even PDAs have this capability if higher power is allowed. wi-fi can have a range of 2.5 KM. Hot spot can be extended to cover tall building

  8. WI- FI (3) • Disadvantages Limited to within 100-300 meters from a hot spot (access point) 4W transmission power The lab top using wi-fi is not allowed to be mobile Spectrum crowded: 2.4 giga hetz

  9. Wi-fi service business is a low risk one • For PCCW • If it spend US $ 10 million, it can provide service to 28 % of urban H.K. by 2011 It can break even by 2009 For a dominant fixed line player like PCCW, wireless coverage is more simple. It can put wi-fi access point atop existing cables

  10. 3G in danger For a 3G operator The cost for a network covering H.K. is US $250 million + 6.4 millions annual licence fee

  11. Wi-fi development in US and Europe • Wi-fi has developed as a community movement. • Wi-Fi normads without an account can have free access • People opening network to entire neighbourhoods, marking access points by chalk in front of wi-fi-enabled houses. This force many local businesses to offer free access too.

More Related