Relaying in mobile communication networks has great potential for cost effective system performance improvement. Integrated Access and Backhaul (IAB) system in 5G is designed to provide relaying for User Equipment (UE) and IAB-nodes. However, designing an efficient and high-capacity IAB operation is still under investigation. In this paper, we propose novel methods to dynamically and autonomously initiate new IAB-nodes in regions where UEs experience temporary quality of service degradation. Moreover, we propose methods for selective handover of UEs with low quality of service to new IAB-nodes in order to improve the overall performance of the system. We present simulation results which demonstrate the performance gains on packet drop rate and delay achieved by utilizing the proposed system and methods.