Bandwidth Extension in LTE-Advanced using Carrier Aggregation

The technology evolution in mobile communications in last few years, has led to an exponential growth in video downloads and the increase in data usage due to smart phones. This resulted in requirement of larger air interface bandwidths. Hence, the Spectrum aggregation has recently received much attention due to the quick increasing of services. The first release of 3GPP LTE provided extensive support for deployment in spectrum allocations of various characteristics, with transmission bandwidths ranging from 1.4MHz up to 20MHz in both paired and unpaired bands. In order to achieve up to 1 Gbps peak data rate in future IMTAdvanced mobile systems, Carrier Aggregation (CA) technology is introduced by the 3GPP to support very-high-data-rate transmissions over wide frequency bandwidths (e.g., up to 100 MHz) in its new LTE-Advanced standards. This technique makes it possible for multiple spectrum bands to be utilized by the same user in order to satisfy the large bandwidth demand of the service and achieve better performance. In this paper, we have discussed the valuation of spectrum and extension of bandwidth using Carrier Aggregation (CA).