In current internet architecture, IP address plays both roles of locator and identification of attached nodes in the network. As the mobility of devices increases, the dual role of IP addresses makes mobility management complicated from security and QoS point of views. Host Identity Protocol (HIP) proposed by the IETF and IRTF introduces a new approach to solve the problem of IP addresses' dual role. HIP introduces the concept o identifier being different from the IP address to identify uniquely the node, no matter which IP address it has. The network keeps the correspondence between this HIP identifier and the current IP address of the mobile node. In this paper, we examined the micro mobility issues and challenges of HIP and we propose a hierarchical approach to improve the HIP update process and a new early update mechanism in order to improve the handover latency.
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