Abstract— To provide high-speed data traffic and maintain the promised QoS in wireless systems, IMS has been introduced in third-generation networks. IMS uses means for creating and maintaining SIP-style sessions. Since IMS deals with high-speed data transfer, this module can be used for purposes other than catering QoS. Here we propose a technique where IMS has been used for updating the location of any mobile node, it not only provides the exact location of any randomly moving node but also helps in emergency state where location determination of any knot can be a setback. As a result, real-time location of any user equipment is obtained which can be further used by the network operator or can be provided for use upon request in rescue cases. Keywords: IMS, Location, Movement, Emergency1. INTRODUCTION: As cellular networks are becoming more and more advanced such as 3G, 3.5G and the upcoming 4G, user requirements in terms of bandwidth, mobility and QoS provisioning are increasing. To meet the QoS needs of users, a new module has been added in cellular systems, namely IP Multimedia Subsystem (IMS). Managing QoS in networks is not a new idea at all; in wired networks QoS was maintained using Session Initiation Protocol (SIP) and the reason this mechanism is implemented in wireless networks is that much of the bandwidth was not available to the user in cellular networks. But with the implementation of 3G and other new standards, more data bandwidth is available. Now not only is multimedia traffic routed using data standards, but traditional voice traffic is also routed using Internet Protocol (IPS). [1] Discusses IMS in the context of user requirements, business requirements, operator requirements, and regulatory requirements. It further highlights... the center of the sheet... the type of session created. [3]SIP is an application-level management protocol capable of generating, modifying and terminating multimedia sessions. SIP can invite participants to existing sessions. Media can be removed or added to a prevailing session. SIP supports name mapping and redirection services transparently. These services support personal mobility, so users can maintain a unique externally visible identifier regardless of their actual location in the network. [3]Session details (e.g. media type) are not represented using SIP. The body of a SIP message includes a session description, which is encoded in another protocol format. One such format is SDP. This SDP message is transmitted by the SIP message in a manner similar to an attached document transmitted by an email message. [3]