G, 2G, 3G, AND NOW ""4 G""



I PHONE 4G



                                                                                            IN TELECOMMUNICATION FIELD "4G" IS THE FOURTH GENERATION OF CELLULAR WIRELESS STANDARDS. IT IS A SUCCESSOR TO THE 3G AND 2G FAMILIES OF STANDARDS.IN 2009 THE ITU-R ORGANIZATION SPECIFIES THE IMT-ADVANCED{INTERNATIONAL MOBILE TELECOMMUNICATIONS ADVANCED.} REQUIREMENTS FOR 4G STANDARDS., SETTING PEAK SPEED RWQUIREMENTS FOR 4G SERVICE AT 100 Mbit/S FOR HIGH MOBILTY COMMUNICATIONS {SUCH AS FROM TRAINS AND CARS}

                                                                          AND 1 Gbit/s  FOR LOW MOBILTY COMMUNICATIONS {SUCH AS PEDESTRIANS AND STATIONARY USERS. } A 4G SYSTEM IS EXPECTED TO PROVIDE A COMPREHENSIVE AND SECURE ALL=IP BASED MOBILE BROADBAND SOLUTION TO LAPTOP COMPUTER WIRELESS MODEMS, SMARTPHONES,AND OTHER MOBILE DEVICES. FACILITIES SUCH AS ULTRA BROADBAND INTERNET ACCESS, IP TELEPHONY, GAMING SERVICES,AND STREAMINDG MULTIMEADIA MAY BE PROVIDED TO THE USERS.