A Framework of (4G) Wireless Networks-Overview and Challenges

In digital systems there is an exponential increase in the mobile user demand. Customers demand more facilities from the technology which they use be it a television, computer, phone or any device which accompany them in their day to day life. The internet helps in gaining faster and better access to information from these devices. In modern systems, wireless and mobile communication technologies are improving day by day. The rising demand of mobile internet and multimedia applications resulted in the growth of broadband wireless access technologies. With the growing demands of users, the third generation (3G) network faces diverse limitations with respect to its data rate, bandwidth, etc. as it cannot accommodate the upcoming multimedia environment. The limitations in the current technologies have led the researchers to formulate new methods. One such technology is 4G. 3G will be replaced by 4G in the upcoming years. 4G has the advantage of mobility, high data rates, high capacity and preservation of full backward compatibility. This paper is an attempt to study the 4G wireless system, its aspects and technologies. The main objective is to recognize and explore the problems and challenges connected to the management of mobility in 4G heterogeneous networks. The secondary purpose is to provide information on different features of 4G that include aspects, future architecture and main technological enablers. The work explains the 4G network in detail along with its scope in the communication industry. Finally, an outline on 5G, 6G & 7G technologies has been given.