Wi-Fi and LTE-LAA coexistence problems, challenges and features in 5GHz unlicensed bandwidth

Authors : Maqsood SULAİMANİ, Seçkin ARI

Pages : 1242-1255

Doi:10.16984/saufenbilder.557409

View : 15 | Download : 7

Publication Date : 2019-12-01

Article Type : Research Paper

Abstract :The demand for high data rate and stable Quality of Service insert ignore into journalissuearticles values(QoS); from cellular networks’ subscribers is a huge challenge for cellular operators. To overcome this issue insert ignore into journalissuearticles values(providing high data rate and stable QoS); it requires more bandwidth. The lack of licensed bandwidth and also its high cost make it hard for operators to overcome this issue. To find a fair solution and expand the capacity of cellular networks, operators started deployment of Long Term Evolution insert ignore into journalissuearticles values(LTE); in unlicensed bandwidth, exactly utilizing 5GHz unlicensed bandwidth in small cell scenarios. The extension of LTE to the 5GHz unlicensed bandwidth where it is already in used by Wi-Fi will create huge coexistence problems between Wi-Fi and LTE. It results from that Wi-Fi and LTE have different channel access mechanisms. This paper presents the channel access mechanisms of Wi-Fi and LTE-Licensed Assisted Access insert ignore into journalissuearticles values(LTE-LAA);, coexistence problems, challenges, privileges, coexistence features of LTE and Wi-Fi and Finally, we conducted the simulation for LAA based on Listen Before Talk insert ignore into journalissuearticles values(LBT); mechanism and Wi-Fi to find that how LAA with LBT mechanism is friendly to the Wi-Fi networks when they share the same bandwidth. The simulation results illustrate that LAA based on LBT channel access mechanism by alone cannot bring a fair coexistence between these two technologies, it needs further improvement.  
Keywords : LTE, LTE LAA, Wi Fi, Coexistence, LBT, CSMA CA, performance