Irat

Irat is a term used in multiple contexts, but its most widely recognized technical meaning is as an acronym in telecommunications: Inter-Radio Access Technology (IRAT). This refers to the process by which a mobile device hands over an ongoing session from one radio access technology to another, such as moving from 4G LTE to 5G NR or from LTE to 3G. IRAT handovers are essential for maintaining calls and data sessions as users move through environments that are served by different network technologies.

In operation, IRAT involves several steps. The mobile device measures signal strength and quality from available networks and reports these measurements to the network. Based on predefined criteria, a target radio access technology is selected, and signaling occurs between network elements to transfer the session while preserving service continuity. Depending on the network configuration, handovers can be network-initiated or device-assisted. Successful IRAT requires compatibility between technologies, appropriate device capabilities, and coordinated resource management across core and radio networks.

Other uses of the term IRAT or the string “irat” may appear in different domains as an acronym for unrelated concepts, or as a personal or place name in certain languages. Because of this, context is important for determining the intended meaning. In contemporary technical literature, however, IRAT most commonly denotes Inter-Radio Access Technology and its role in seamless mobility across heterogeneous wireless networks.