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

Maqsood Sulaimani, Seçkin Arı
2019 Sakarya University Journal of Science  
The demand for high data rate and stable quality of service from cellular networks' subscribers is a huge challenge for cellular operators. To overcome this issue, while keeping high data rate and stable quality of service more bandwidth is required. The lack of licensed bandwidth and also its high cost make it hard for operators to overcome this issue. To find an effective solution and expand the capacity of cellular networks, operators have started deployment of Long Term Evolution (LTE) in
more » ... licensed 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 due to different channel access mechanisms of Wi-Fi and LTE. This paper presents the channel access mechanisms of Wi-Fi and LTE-Licensed Assisted Access (LTE-LAA), coexistence problems, challenges, privileges, coexistence features of LTE and Wi-Fi. Finally, simulations are provided for LTE-LAA based Listen Before Talk (LBT) mechanism and Wi-Fi to show that LTE-LAA with LBT mechanism is friendly to the Wi-Fi networks when using the same 5GHz unlicensed channel. The simulation results illustrate that LTE-LAA based-LBT channel access mechanism by alone cannot bring a fair coexistence between these two technologies, and it needs further improvement. /0000-0001-7556-8205 huge capacity problems due to high load of traffic and the explosion of data hungry applications. As operators using licensed spectrum, due to the lack of licensed spectrum and its high price it will be difficult for operators to overcome the issue of capacity. As operators look for a supplementary
doi:10.16984/saufenbilder.557409 fatcat:d5qhyczblvhzdfui2mynhvfsvu