Realization of LBT for Co-existence of U-LTE with Wi-Fi using Cognitive Radio

The advanced cellular network, Long Term Evolution (LTE) which presently operates in licensed spectrum has been extended to Unlicensed LTE (U-LTE) by Qualcomm and Ericsson to improve data rate and spectral efficiency by utilizing unlicensed spectrum. Carrier Aggregation of 3GPP LTE-A supports the aggregation of licensed and unlicensed spectrum in small and femto cells to provide better user experience. The recently evolved intelligent technology viz. Cognitive radio which supports the efficient spectrum utilization is applied in the proposed system model to detect the white spaces in unlicensed spectrum to accomplish Listen-Before-Talk (LBT) regulatory requirement of radio communication in U-LTE. Another major goal of U-LTE to co-existence along with WiFi users in a non-interference style is also accomplished by the use of Cognitive radio. Based on the above concepts, it is attempted to enhance the unlicensed spectrum utilization and to address the coexistence issues in U-LTE.