What is 4G (fourth-generation wireless)?

What is 4G (fourth-generation ) - 

A 4G system is expected to provide a communication technology based on internet protocol. Internet protocol or IP is generally used in the computer networks for data communication among computers. All the devices are identified by a number called IP number. In 4g Network this concept is extended to telephony with an intention to make data and voice communication integrated in the same architecture.

The 4G network is supposed to facilitate a Gigabit speed i.e. a speed of 100+ Mega Bytes per second with a mobile node speed of up to 200km/hr. It will enable internet access, IP telephony, gaming services, and streamed multimedia using the same infrastructure. The generation of wireless system is based on packet switched communication with wide coverage and high throughput.

The 4G wireless uses orthogonal Frequency Division Multiplexing (OFDM), Ultra Wide Radio Band(UWB) and Millimeter wireless. The frequency band used in 4G is 2-8 GHz.

FEATURES -

• Inbuilt multimedia support.
• Television connectivity.
• Faster data transmission rate of up to approximately 100Mbit/s for high mobility such as mobile access.
• Approximately 1 Gbit/s for low mobility such as nomadic/local wireless access, according to the ITU requirement Support of bandwidth up to at least 40 MHz should be provided.
• Expected to provide a secure all-IP based solution with facilities such as IP telephony, ultra-broadband internet access.
• Although legacy systems are in place to adopt existing users, the infrastructure for 4G will be only packet based (all-IP)
• Incorporate Flash-OFDM, the 802.16e WLAN and Wimax.

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Advantage of 4g network -

•  4g will be based on packet switching only thus requiring low-latency data transmission.
• 4g will have IPv6 to support a large number of wireless-enabled devices.
• 4g allow seamless mobility, thus a file transfer in not be intrupted in case a terminal moves one call(one base station covrage area) to another, but handover is carried out.
• While maintaining seamless mobility, 4G will offer very high data rates with expectations of 100 Mbit/s wireless services.

Disadvantage of 4G network -

•  A major issue in 4G system is to make the high bit rates available in a larger portion of the cell, especially to user in an exposed position in between several base station.