In 4G wireless networks different access networks operate in cooperative manner. It offers seamless connectivity and high-speed multimedia services in different types of wireless networks.   One of the most challenging issues related to mobility is vertical handoff. Mobile IP is a prominent solution to handle mobile node movement in 4G wireless networks. However, Mobile IP suffers from long handoff latency. Our handoff management system tries to improve the performance of handoff operation in basic integration approaches.  This paper demonstrates applicability of Information Technology (IT) in 4G wireless networks by proposing a vertical handoff scheme and discusses its operations like: handoff decision-making, network selection, handoff execution.  The proposed handoff scheme is suitable for both tightly and loosely coupled architectures of 4G wireless networks. The scheme represents handoff operations in two basic integration approaches.  A simulation study of the vertical handoff is made to evaluate its performance in terms of dropped packets during handoffs in tightly coupled and loosely coupled architectures.  

No abstract

No abstract

Next generation mobiles in 4G wireless network have provision to access the radio resource of heterogeneous wireless networks. Futiher the ongoing call can be switched to another wireless network on occurrence of congestion or mobility. This technique of transfen'ing ongoing call to another wireless network detined as vertical handotl Before initiating vertical handoff it is necessary to estimate the available bandwidth in heterogeneous neighbouring networks. This paper addresses the agent based bandwidth estimation in 4G wireless networks. The agents together find an optimal available bandwidth for connectionless and connection oriented service. The model uses both the static and mobile intelligent agent.

No abstract