  Deploying access and backhaul as wireless links, a.k.a. integrated access and
backhaul (IAB), is envisioned as a viable approach to enable flexible and dense
networks. Even further, mobile IAB (mIAB) is a candidate solution to enhance
the connectivity of user equipments (UEs) moving together. In this context,
different of other works from the literature, the present work overviews the
basis for the deployment of mIAB by presenting: 1) the current status of IAB
standardization in the fifth generation (5G) new radio (NR); 2) a new taxonomy
for state-of-the-art works regarding fixed IAB and mIAB; 3) an extensive
performance analysis of mIAB based on simulation results; and 4) open
challenges and potential future prospects of mIAB. Specifically, the proposed
taxonomy classifies IAB works according to different perspectives and
categorizes mIAB works according to the type of mobility. For each type of
mobility, the main studied topics are presented. Regarding the performance
evaluation, we consider an urban macro scenario where mIAB nodes are deployed
in buses in order to improve the passengers connection. The results show that,
compared to other network architectures, the deployment of mIAB nodes
remarkably improves the passengers throughput and latency in both downlink and
uplink.
