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With the new 5G trend, the amount of heterogeneous networks (HetNets) has increased exponentially. Cooperation between the most commonly used HetNets such as: WiFi and Long Term Evolution (LTE) is required to ensure a balanced traffic load which benefits the end user with maximum throughput and high quality of service. A balanced traffic problem with WiFi- LTE heterogeneous wireless networks is selecting which network to use, LTE or WiFi, if both are available. In other words, a node would have to send/receive traffic using either LTE or WiFi. We address this issue and propose both a WiFi available bandwidth estimation technique called “Available Bandwidth with Error Probability (ABEP)” and a traffic steering strategy to improve the performance of WiFi-LTE wireless networks. Our approach provides a better estimation of available bandwidth in WiFi with respect to relevant bandwidth estimation …