  3GPP LWIP Release 13 technology and its prestandard version Wi-Fi Boost have
recently emerged as an efficient LTE and Wi-Fi integration at the IP layer,
allowing uplink on LTE and downlink on Wi-Fi. This solves all the contention
problems of Wi-Fi and allows an optimum usage of the unlicensed band for
downlink. In this paper, we present a new feature of Wi-Fi Boost, its radio
link management, which allows to steer the downlink traffic between both LTE
and Wi-Fi upon congestion detection in an intelligent manner. This customised
congestion detection algorithm is based on IP probing, and can work with any
Wi-Fi access point. Simulation results in a typical enterprise scenario show
that LWIP R13 and Wi-Fi Boost can enhance network performance up to 5x and 6x
over LTE-only, and 4x and 5x over Wi-Fi only networks, respectively, and that
the the proposed radio link management can further improve Wi-Fi Boost
performance over LWIP R13 up to 19 %. Based on the promising results, this
paper suggests to enhance LWIP R13 user feedback in future LTE releases.
