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Mobility access through IPv4 and IPv6 provides seamless services for the user terminals across different access networks. To provide seamless continuity while the mobile is moving from one access networks to another is provided by different mechanisms, on the whole the proposed mechanisms provides mobility with special requirements and access mechanism. Client Mobile IP (CMIP) is the most popular solution for the mobility but there are limitations and it cannot provide the total mobility solution. Proxy Mobile IP (PMIP) is a mobility mechanism to ensure mobility management of the user terminal in different access networks. This method provides the network based mobility management without any client interactions. By this method the signaling overhead and the latency during the handover and roaming is reduced. In this proposed mechanism the mobile node doesn't need to have support for the mobility instead the access network provide the mobility for the user terminal. Even though the proxy mobile IPv4 provides the mobility management there are some of the issues that have to be solved for the network controlled mobility management. In this proposed paper we proposed new mechanism using proxy mobile IP and AAA with the new mobility extensions to provide low latency handover support in heterogeneous networks. In this paper we propose this architecture with the new protocol formats and algorithms and interactions between different components of the architecture in the heterogeneous networks. We developed a testbed using WLAN, WIMAX, 3G access networks and demonstrated the capabilities of our solutions.