Wireless Communication Engineering (Fall 2004). Lecture 1 Professor Mingbo Xiao Sept. 23, 2004. Let’s Know Each Other. My Self-Introduction Course Objectives and My Wishes Your Self-Introduction (Name, Major, Reasons for taking this course, etc.)
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Professor Mingbo Xiao
Sept. 23, 2004
NO late submission or
any type of cheating
is allowed in this class.
Homework is due before the next lecture starts.
Given two boxes of GO chesses. Put a handful of the black chesses into the white box, mix them, and then take a handful of the mixed chesses back to the first box.
Question: Which one is larger, the number of black chesses in the white box or the number of white chesses in the black box?
Wireless is often prior to its wired counterpart and has become an important supplement:
IMT-2000 comprises several 3G standards:
Paradigm From 1G to Beyond 3G
All IP based
Mobile InternetApplication Servers
Mobility, Connection& Control Servers
WPAN WLAN WWAN
Media access system
IP based core network
Network of 3G beyond
3G and beyond
384 kbps-20 Mbps
384 kbps-2 Mbps
Transmission Data Rate
Indoor, lower velocity：1Gbps
Capacity: 5-10 times higher than 3G
Frequency efficiency: Multi-cell: > 2bits/Hz
Single-cell: 5~10 bits/Hz
Non Real Time
(e.g. Internet access)
Drivers of 3G Beyond
3G evolution …but difficult
Revolution from subscriber service expectations
Drivers of 3G Beyond
Evolution from 2G systems
Multimedia traffic increases 40%/year.
10Mbps downstream service emerges.
Saturation of 1G/2G services traffic.
Voice : Multimedia traffic ratio
1 : 2 (in 2010)
Relative traffic value in bits (Ref: 1999)
Voice (U/D: 16k, VOX0.5)
Others (<64 kbps)
(Forecast by ITU-R TG-8/1 for Asia)Service Forecast for Asia Region