Commenced in January 2007
Paper Count: 30465
An Adaptive Opportunistic Transmission for Unlicensed Spectrum Sharing in Heterogeneous Networks
Abstract:Efficient utilization of spectrum resources is a fundamental issue of wireless communications due to its scarcity. To improve the efficiency of spectrum utilization, the spectrum sharing for unlicensed bands is being regarded as one of key technologies in the next generation wireless networks. A number of schemes such as Listen-Before-Talk(LBT) and carrier sensor adaptive transmission (CSAT) have been suggested from this aspect, but more efficient sharing schemes are required for improving spectrum utilization efficiency. This work considers an opportunistic transmission approach and a dynamic Contention Window (CW) adjustment scheme for LTE-U users sharing the unlicensed spectrum with Wi-Fi, in order to enhance the overall system throughput. The decision criteria for the dynamic adjustment of CW are based on the collision evaluation, derived from the collision probability of the system. The overall performance can be improved due to the adaptive adjustment of the CW. Simulation results show that our proposed scheme outperforms the Distributed Coordination Function (DCF) mechanism of IEEE 802.11 MAC.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1124651Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1019
 H. Zhang, X. Chu, W. Guo, and S. Wang, “Coexistence of wi-fi and heterogeneous small cell networks sharing unlicensed spectrum,” IEEE Communications Magazine, vol. 53, no. 3, pp. 158–164, 2015.
 B. Jia and M. Tao, “A channel sensing based design for lte in unlicensed bands,” in IEEE International Conference on Communication Workshop (ICCW), 2015. IEEE, 2015, pp. 2332–2337.
 A. M. Baswade and B. R. Tamma, “Channel sensing based dynamic adjustment of contention window in laa-lte networks,” in 2016 8th International Conference on Communication Systems and Networks (COMSNETS). IEEE, 2016, pp. 1–2.
 R. Kwan, R. Pazhyannur, J. Seymour, V. Chandrasekhar, S. Saunders, D. Bevan, H. Osman, J. Bradford, J. Robson, and K. Konstantinou, “Fair co-existence of licensed assisted access lte (laa-lte) and wi-fi in unlicensed spectrum,” in Computer Science and Electronic Engineering Conference (CEEC), 2015 7th. IEEE, 2015, pp. 13–18.
 G. Bianchi, “Performance analysis of the ieee 802.11 distributed coordination function,” IEEE Journal on Selected Areas in Communications, vol. 18, no. 3, pp. 535–547, 2000.
 P. Khan, N. Ullah, S. Ullah, and K. S. Kwak, “Analytical modeling of ieee 802.15.6 csma/ca protocol under different access periods,” in 14th International Symposium on Communications and Information Technologies (ISCIT), 2014. IEEE, 2014, pp. 151–155.