4G [PART-3]

Introduction: 4G means fourth generation mobile telecommunication technology.  A true 4G system must provide many Potential and current applications that include amended mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing, 3D television, and cloud computing. 4G or fourth generation telecommunicating network generally refers to a change in the fundamental nature of the service, non-backwards-compatible transmission technology, higher peak bit rates, new frequency bands, wider channel frequency bandwidth in Hertz, and higher capacity for many simultaneous data transfer. The history of 4G is very long; 4G system was originally envisioned by the Defense Advanced Research Projects Agency (DARPA). The DARPA selected the distributed architecture and end-to-end Internet protocol (IP), and believed at an early stage in peer-to-peer networking in which every mobile device would be both a transceiver and a router for other devices in the network, eliminating the spoke-and-hub weakness of 2G and 3G cellular systems. Since the 2.5G GPRS system, cellular systems have provided dual infrastructures packet switched nodes for data services, and circuit switched nodes for voice calls. In 4G systems, the circuit-switched infrastructure is abandoned and only a packet-switched network is provided, while 2.5G and 3G systems require both packet-switched and circuit-switched network nodes, i.e. two infrastructures in parallel. This means that in 4G, traditional voice calls are replaced by IP telephony. The general work of 4G was started in 2002. In February 2007, the Japanese company NTT DoCoMo tested a 4G communication system prototype with 4×4 MIMO called VSF-OFCDM at 100 Mbit/s while moving, and 1 Gbit/s while stationary. NTT DoCoMo completed a trial in which they reached a maximum packet transmission rate of approximately 5 Gbit/s in the downlink with 12×12 MIMO using a 100 MHz frequency bandwidth while moving at 10 km/h, and is planning on releasing the first commercial network in 2010. Currently more than 900 countries use 4G telecommunication network all over the world. Bangladesh could launch fourth-generation telecom service soon as the necessary 'ecosystem' will be here within a year. Investment in 4G technology will depend on the policy decisions of the country's government. The telecom regulator of Bangladesh plans to release 700 megahertz spectrum for 4G technology to mobile. The five companies Banglalion, Qubee, Bangladesh Internet Exchange Limited (BIEL), Mango and state-owned Bangladesh Telecommunications Company Limited will have to pay Tk 2.4tk for getting the license. BIEL, owned by Russian company Multinet has been already awarded the license and allotted 2,600 frequency bands after the company had paid the Tk 2.46 billion license fee, said a senior BTRC official requesting anonymity.