High-speed Synchronous Backhaul Method with Aggregation of Multiple WiFi Channels

As the substantial growth of data traffic over the past few years, the deployment of cellular base stations tends to be smaller and denser which puts forward higher requirements for backhaul techniques. In this study, WiFi is taken as a backhaul technique in 5G networks, and then a high-speed synchronous backhaul solution is proposed with aggregation of multiple WiFi channels of which the spectrum is non-continuous. Although IEEE 802.11n/ac can achieve channel aggregation with static/dynamic channel bonding scheme, the spectrum of these channels must be continuous. Moreover, static channel bonding is not flexible enough and dynamic channel bonding rarely has chance to be implemented when devices are deployed densely. The proposed solution can not only extend transmission bandwidth and improve network capacity of 5G backhaul networks, but also overcome defects of channel bonding in 802.11n/ac. Both analytical results and simulations show that the performance of the proposed solution is better than the traditional channel bonding and it can reduce adjacent channel interference among multiple channels in 5G backhaul networks. Meanwhile, the effectiveness and feasibility of the proposed solution are proved by the prototype verification system.