文档介绍：3G From a North American Perspective
Stuart Jeffery
VP Magine Inc
1072 Seena Ave
Los Altos, CA 94024
E-mail <stu@>
Office +1
Mobile +1
1
Trends in Wireless
Red Herring & Shosteck
2
Outline
US wireless history
US versus European Markets
Technology evolution
Emerging services
3G wireless
Unlicensed Wireless
User Terminal
Path to global interworking
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BC (Before Cellular)
Single Channel Radio Telephone
High power transmitter on a high spot
Each user has own channel
range of 50 miles
Trunked Radio
“Trunking efficiency” by sharing channels
More spectrum efficient
Cellular
like Trunked radio, share the channels
Low power= small coverage area
Low power = frequency reuse
More expensive infrastructure
4
History (USA Part 1)
Early days of Cellular in US.
1. ATT developed technology in 70’
2. A lot of legal and technical in fighting regarding the frequencies and ownership
3. FCC finally passed regulation in 82 establishing band and two licenses
4. ATT was now broken up, so LEC got one license
5. How to award second license?
6. Resolved by early ‘83 - Two cellular bands issued shortly thereafter
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History (USA Part 2)
By early ‘90s capacity starting to be a problem:
1. Analog - NAMPS (low deviation voice) - 3 voice channels in 30 kHz
2. Digital - TDMA (compressed digitized voice) - 3 voice channels in 30 kHz
3. CDMA developed as “better” digital
4. CDMA endorsed by “B side”- very political
5. munications emerged as repurposed Trunked Radio; later became Nextel
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History (USA Part 3)
Late ‘90s PCS bands allocated to address capacity issues
1. USA (and Canada) allocated part of IMT-2000 (3G band) to North American PCS
2. A and B band auctions went smooth
3. Pioneer Preference Licensing process had big problems
4. C band “Designated Entity” auctions had serious problems
5. Technology for PCS is “upbanded cellular” plus GSM-1900 (no AMPS)
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Europe consolidated on GSM
1. works emerged
2. GSM - selected as single standard
3. DEC