  The internet of things (IoT) refers to a framework of interrelated, web
associated objects that can gather and move information over a remote network
without human interference. With a quick development in the arrangement of IoT
gadgets and expanding want to make medical care more financially savvy,
customized, and proactive, IoT is ready to assume a solid function in all
perspectives of the healthcare industry. In this context, IoT-based healthcare
provides several benefits such as instant and reliable treatment, cost
reduction, improved communication, etc. by using different new technologies.
Wireless Body Area Networks (WBAN) technologies can enhance the quality of data
gathering and data transferring in smart systems. Machine Learning(ML) are put
to use at every level of smart healthcare systems. Fog computing reduces
communication cost and provides low latency. Software-Defined Networking (SDN)
and Network Function Virtualization (NFV) technologies provide less complex and
more flexible network structures. Blockchain technology offers a better way of
protection of users' sensitive information. This paper aims to provide
comprehensive descriptions of ongoing research projects and the utilization of
the above-mentioned technologies in smart healthcare systems. In this paper,
the latest studies, proposed techniques, and the current solutions of smart
healthcare systems are elaborated in the context of emerging technologies,
applications and challenges of these systems to provide a better understanding
of what IoT means in the healthcare industry now and what it will mean in the
future.
