27-04-2011, 10:55 AM
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3G Technology
3G is an one of a most recent radio transmission technologies (RTTs).
To Completely Understand The Modern Technology, Have To Know What is 3G Standards and 3G Spectrum.
Introduction
The Third Generation (3G) digital mobile multimedia offering broadband mobile communications with voice, video, graphics, audio and other information.
The mobile communications industry has evolved in three stages, and correspondingly three generations of mobile phones have emerged thus far. Each one has provided more flexibility and usability than the previous ones.
(1G) Analog: Analog phones helped to make voice calls inside one's country without roaming facilities.
(2G) Digital mobile phone systems added fax, data and messaging capabilities as well as voice telephone service in many countries offering worldwide roaming.
(3G) Multimedia services add high speed data transfer to mobile devices, allowing new video, audio and other applications (including Internet services) through mobile phones.
Features
1. With 3G, the information is split into separate but related packets before being transmitted and reassembled at the receiving end. Packet switched data formats are much more common than their circuit switched counterparts.
2. The World Wide Web (WWW) is becoming the primary communications interface. People access the Internet for entertainment, services, and information collection, the intranet for accessing enterprise information and connecting with colleagues and the extranet for accessing customers and suppliers.
3. Speeds of up to 2 Megabits per second (Mbps) are achievable with 3G. The data transmission rates will depend upon the environment, the call is being made in, however, only indoors and in stationary environments that these types of data rates will be available. For high mobility, data rates of 144 kbps are expected to be available.
Applications
3G facilitates several new applications that have not previously been readily available over mobile networks due to the limitations in data transmission speeds.
These applications range from Web Browsing to file transfer to Home Automation (the ability to remotely access and control in-house appliances and machines).
Because of the bandwidth increase, these applications will be even more easily available with 3G than they were previously with interim technologies.
Concepts we have to Know
Simplex vs. Duplex
TDD vs. FDD
Symmetric vs. Asymmetric Transmission
TDMA vs. CDMA
Spread spectrum
Circuit Switching vs. Packet Switching
Simplex vs. Duplex
When people use walkie-talkie radios to communicate, only one person can talk at a time (the person doing the talking has to press a button). This is because walkie-talkie radios only use one communication frequency - a form of communication known as simplex:
Simplex: Using a walkie-talkie you have to push a button to talk one-way. Of course, this is not how mobile phones work. Mobile phones allow simultaneous two-way transfer of data - a situation known as duplex (if more than two data streams can be transmitted, it is called multiplex):
3G Technology
3G is an one of a most recent radio transmission technologies (RTTs).
To Completely Understand The Modern Technology, Have To Know What is 3G Standards and 3G Spectrum.
Introduction
The Third Generation (3G) digital mobile multimedia offering broadband mobile communications with voice, video, graphics, audio and other information.
The mobile communications industry has evolved in three stages, and correspondingly three generations of mobile phones have emerged thus far. Each one has provided more flexibility and usability than the previous ones.
(1G) Analog: Analog phones helped to make voice calls inside one's country without roaming facilities.
(2G) Digital mobile phone systems added fax, data and messaging capabilities as well as voice telephone service in many countries offering worldwide roaming.
(3G) Multimedia services add high speed data transfer to mobile devices, allowing new video, audio and other applications (including Internet services) through mobile phones.
Features
1. With 3G, the information is split into separate but related packets before being transmitted and reassembled at the receiving end. Packet switched data formats are much more common than their circuit switched counterparts.
2. The World Wide Web (WWW) is becoming the primary communications interface. People access the Internet for entertainment, services, and information collection, the intranet for accessing enterprise information and connecting with colleagues and the extranet for accessing customers and suppliers.
3. Speeds of up to 2 Megabits per second (Mbps) are achievable with 3G. The data transmission rates will depend upon the environment, the call is being made in, however, only indoors and in stationary environments that these types of data rates will be available. For high mobility, data rates of 144 kbps are expected to be available.
Applications
3G facilitates several new applications that have not previously been readily available over mobile networks due to the limitations in data transmission speeds.
These applications range from Web Browsing to file transfer to Home Automation (the ability to remotely access and control in-house appliances and machines).
Because of the bandwidth increase, these applications will be even more easily available with 3G than they were previously with interim technologies.
Concepts we have to Know
Simplex vs. Duplex
TDD vs. FDD
Symmetric vs. Asymmetric Transmission
TDMA vs. CDMA
Spread spectrum
Circuit Switching vs. Packet Switching
Simplex vs. Duplex
When people use walkie-talkie radios to communicate, only one person can talk at a time (the person doing the talking has to press a button). This is because walkie-talkie radios only use one communication frequency - a form of communication known as simplex:
Simplex: Using a walkie-talkie you have to push a button to talk one-way. Of course, this is not how mobile phones work. Mobile phones allow simultaneous two-way transfer of data - a situation known as duplex (if more than two data streams can be transmitted, it is called multiplex):
