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GSM versus CDMA for iPhone



on 30 April 2010

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Transcript of GSM versus CDMA for iPhone

GSM versus CDMA Which technology is best for the potential Verizon iPhone?
What is Global System for Mobile Communications? Groupe Spécial Mobile
Open, digital cellular technology
International standards for an entire network infrastructure
3 main frequencies dependant on country: 900MHz, 1800MHz, and 1900MHz Finland 1991
*Good subjective speech quality
* Low terminal and service cost
* Support for international roaming
* Ability to support handheld terminals
* Support for range of new services and facilities
* Spectral efficiency
* ISDN (Integrated Services Digital Network) compatibility
Fully digital from the beginning Uses SIM cards
Operational in over 110 countries
Most popular standard (80%) GSM Technology Digitally encodes speech and transmits as a digital stream
Can send and receive data at rates up to 9600bps to specific users
Unique features: SIM card and SMS
SMS-a bidirectional service for short alphanumeric messages. Can be stored and forwarded
Allows personal mobility FDMA
Division by frequency of the bandwidth into 124 carrier frequencies
Spaced 200kHz apart
Assigned to each base station TDMA
Carrier frequecies are divided in time using a scheme
Fundamental unit of time=burst period
8 burst periods are grouped=basic unit for the definition of logical channels
1 physical channel=1 burst per TDMA frame What is Code-Division Multiple Access? Channel access method
Spread-spectrum technology
Special coding scheme 1988 Qualcomm Inc.
Initiated in 1995
GPS for code division multiplexing
Cell phones sending multiple signals or streams of info. on a carrier at the same time in the form of a single, complex signal and then recovering the separate signals at the receiving end -helps send voices, data, and signaling data between mobile devices
-allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth
- employs analog-to-digital conversion in combination with spread spectrum technology
Most common in U.S.
Transmission speed 144Kbps in a single channel and up to 115Kbps in an eight-channel format
Delivers data faster CDMA Technology Audio input digitized into binary elements
Frequency of transmitted signal varies
Follows transmitter frequency
Trillions of possibilites that enhance privacy
Soft handoff minimizes signal breakup as a handset passes from one cell to another Which is Better for the Verizon iPhone? CDMA Issues
4G Network and LTE
Simultaneous usage
Great investment; Pegatron Technology GSM Issues
Not the current technology
Competition with AT&T
Privacy and more dropped calls Data Transfer Methods
CDMA-1xRTT Resources http://www.gsmworld.com/technology/gsm/index.htm GSM
http://searchmobilecomputing.techtarget.com/definition/GSM GSM
http://www.privateline.com/mt_gsmhistory/ GSM
http://www.diffen.com/difference/CDMA_vs_GSM GSM
http://searchtelecom.techtarget.com/sDefinition/0,,sid103_gci213842,00.html CDMA
http://globalccf.org/cdma_resources/history.html CDMA
http://www.cn-c114.net/578/a494297.html CDMA iPhone
http://www.cnn.com/2010/TECH/04/01/cnet.verizon.iphone/index.html Verizon iPhone
Test Questions 1. The unique feature of the CDMA technology is the Subscriber Identity Module (SIM) card. True/False
What does GSM stand for?
A. Global Standard Messaging
B. Global System for Market Communications
C. Global System for Mobile Communications
D. Global Standard for Mobile Communications
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