Answer

IMT-2000 stands for International Mobile Telecommunications-2000 which belongs to third generation. The objective of the third generation (3G) of wireless communication is to provide fairly high speed wireless communications to support multimedia, data, and video in addition to voice. The ITU’s International Mobile Telecommunications for the year 2000 (IMT-2000) initiative has defined the ITU’s view of third generation capabilities as

• Voice quality comparable to the public switched telephone network
• 144 kbps data rate available to users in high speed motor vehicles over large areas
• 384 kbps available to pedestrians standing or moving slowly over small areas
• Support for 2.048 Mbps for office use
• Symmetrical and asymmetrical data transmission rates
• Support for both packet switched and circuit switched data services
• An adaptive interface to the internet to reflect efficiently the common asymmetry between inbound and outbound traffic
• More efficient use of the available spectrum in general
• Support for a wide variety of mobile equipment
• Flexibility to allow the introduction of new services and technologies

Key features of IMT-2000are:

• High degree of commonality of design world wide
• Compatibility of services within IMT-2000 and fixed networks
• High quality
• Small terminal for worldwide use
• World-wide roaming capability
• Capability for multi-media applications and a wide range of services and terminals.

An alternative interfaces schemes have been adopted as part of IMT-2000 that is shown below in below mentioned figure. The specification covers a set of radio interfaces for optimized performance in different radio environments.

IMT-2000 terrestrial radio interfaces

A major reason for the inclusion n of five alternatives was to enable a smooth evolution from the existing first and second generation systems. The five alternatives reflect the evolution from the second generation. This scheme fully exploits CDMA technology to provide high data rates with efficient use of bandwidth.