Transcript The World in the Eyes of an Engineer

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
USA
Japan
UK
Europe
HK
1
9
4
1
1
0.15
Ranking on IT
•
Singapore
Market
Infrastructure
Government
Application (CO)
Application ( P)
…..
Total
Taiwan
Korea
H.K.
10
13
1
7
9
7
19
2
18
14
19
25
15
12
1
23
18
11
15
23
3
9
14
18
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)
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
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
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
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
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
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-fienabled houses. This force many local businesses
to offer free access too.