10-25-2008 Homework

Summarize 3GPP LTE in 200 words.

11/1 OFDMA and WiMAX Technology

OFDMA and WiMAX Technology (slides)

delayed

Notice

Class of Oct 25 will begin at 2:00 p.m. because I will go to Taipei to be awarded a service medal from a nonprofit organization, Consumers Foundation.

My trip to Nova Scotia, Canada. (some in Chinese and some in English)

OSBRiDGE 3GN

802.11n Access Point and UMTS/GSM Gateway in one device.

See: HSDPA in Wikipedia

Technology beyond 3G

From 2G, 2.5G, 3G (IMS, IP Multimedia Subsystem), 3.5G/HSDPA, to 4G

Computer Communications (IT), IP-based, WiFi (Data Comm.), VoIP

Data Services

• 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), speed denoted as *u*d
• EDGE, 3 times of speed of GPRS by using 8-PSK instead of binary GMSK
• 3G, 384kbps, up to 2 Mbps, uplink is 128 kbps
• 3.5G HSDPA (High Speed Downlink Packet Access) 8-10 Mbps (R5), and 20 Mbps (R6) by MIMO, uplink is 384 kbps

Chips supporting HSDPA

OFDMA and WiMAX Technology (slides)

WiMAX vs. HSDPA

• similar:Handover, Multimedia (<>
• difference: physical, initial cost, TCO (Total Cost Ownership)

4G communication at 100 Mbit/s while moving, and 1 Gbit/s while stationary.

Pervasive networks

• simultaneously connected to several wireless accesstechnologies (Wi-Fi, UMTS for example) and can seamlessly move between them (handover)
  
• smart-radio aka cognitive radio technology to efficiently manage spectrum use and transmission power
• mesh routing protocols
• 4G may use OFDM , and also OFDMA.
• packet switching only

In general, a generation is defined by the result of technology changes over a 10-15 year time frame. Thus, 4G would refer to whatever is deployed in the 2010-2015 period, assuming 3G deployment spans the 2000-2009 period.

See

• Wikipedia 4G
• 3GPP LTE
  

Homework 10-4-2008

1. Why 2G is faster than 1G?

2. Why cellular is better than broadcast?

3. Describe a short history of development of cellular technology from 1G to 3G with a prediction of 4G and beyond.

4. Read the article that discussed the future of mobile social networks.

Due Oct 25, 2008

future of social networking

According to this article, two interviews with cofounder of Flickr 
and cofounder of Aka-Aki point out that the future of social networking is 
mobile social networking. 

http://edition.cnn.com/2008/TECH/science/09/25/social.networking/inde...