In recent years, the Internet of Things (IoT) technology has been being increasingly applied to diverse application areas including healthcare monitoring, disaster management, and so on. In IoT, most of the objects are mobile, and may thus require IP mobility management, maintaining the IP connectivity. Unfortunately, most of standard mobility management protocols such as IETF Mobile IPv6 (MIPv6) and its variants such as HMIPv6, PMIPv6, and NEMO [1] are not suitable for IoT environments. This is because the IoT environments are usually comprised of constrained devices with limited packet size, high packet loss rate, power, and sleep mode operation which are interconnected to each other over unreliable wireless networks.