4G technology is defined as the provision of wireless broadband data and information services right to a person’s mobile unit. BSNL will become the first operator to introduce the 4G Technology WIMAX in India by launching India’s first ever mobile broadband 4G Technology (fourth generation ) Internet access network mobile WiMAX. This service would be facilitated by the Technology from AVIAT. WiMAX being abbreviated as Worldwide Interoperability for Microwave Access Technology will provide high-speed internet access upto 37 mbps.
BSNL 4G Technology WiMAX will render excellent broadband access at a comparatively better price and performance ratio than the other broadband Technologies. This Technology claims to offer omnipresent high-speed broadband connectivity round the clock for devices such as Desktop, Laptop on wireless.A 4G system is expected to provide a comprehensive and secure all-IP based solution where facilities such as IP telephony, ultra-broadband Internet access and gaming provided to users.
The Mobile WiMAX (IEEE 802.16e-2005) mobile wireless broadband access (MWBA) standard is sometimes branded 4G, and offers peak data rates of 128 Mbit/s downlink and 56 Mbit/s uplink over 20 MHz wide channels. The IEEE 802.16m evolution of 802.16e is under development, with the objective to fulfill the IMT-Advanced criteria of 1000 Mbit/s for stationary reception and 100 Mbit/s for mobile reception.
4G is being developed to accommodate the QoS and rate requirements set by further development of existing 3G applications like wireless broadband access, Multimedia Messaging Service (MMS), video chat, mobile TV, but also new services like HDTV content, minimal services like voice and data, and other services that utilize bandwidth. 
The 4G working group[clarification needed] has defined the following as objectives of the 4G wireless communication standard:* Flexible channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz.
* A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixed positions as defined by the ITU-R,
* A data rate of at least 100 Mbit/s between any two points in the world,
* Peak link spectral efficiency of 15 bit/s/Hz in the downlink, and 6.75 bit/s/Hz in the uplink (meaning that 1000 Mbit/s in the downlink should be possible over less than 67 MHz bandwidth)
* System spectral efficiency of up to 3 bit/s/Hz/cell in the downlink and 2.25 bit/s/Hz/cell for indoor usage.
* Smooth handoff across heterogeneous networks,
* Seamless connectivity and global roaming across multiple networks,
* High quality of service for next generation multimedia support (real time audio, high speed data, HDTV video content, mobile TV, etc)
* Interoperability with existing wireless standards, and
* An all IP, packet switched network.
4G phones being awaited.