The Secure Device-to-Device Communication (SD2D): Safely Sharing Unlicensed Bands between WLAN and LTE

Recent developing technologies created the use of Long Term Evolution (LTE) over Unlicensed band (LTE-U). The utilization of unlicensed band for effective Device-to-Device communication is performed by coexistence of LTE-U with Wireless Local Area Network (WLAN). The challenges and limitations of this new technology are addressed. The major issues addressed in this paper are identification of idle subframe and security requirements. This paper presents a novel Device-to-Device Communication in coexistence of LTE-U with WLAN. Markov Chain model is proposed for the prediction of idle subframe and cross validate with the reports obtained from spectrum agent. Spectrum agent is a special entity that participates for accurate determining of idle sub-frames. We propose auction based channel occupancy for D2D communication. Bidding value is estimated based on collision probability and interference. Evaluation of bidding values in terms of Signal Interference Noise Ratio (SINR) and spectral efficiency by using novel Firefly based Particle Swarm Optimization algorithm in each device. On allocation of idle subframes, D2D communication is involved by the usage of hybrid Elliptic Curve Cryptography with RSA algorithm. Finally experimental evaluation is performed in Ns-3 simulator and results are evaluated in terms of average throughput, delay, dropping rate and system secrecy rate.