Abstract
Current trends show that UMTS network and WLAN will co-exist and work together to support more users with higher data rate services over a wider area. However, this integration invokes many challenges such as mobility management and handoff decision making. Vertical handoff is switching process between heterogeneous wireless networks in a 3G/WLAN network. Vertical handoffs often fail due to the abrupt degrade of the WLAN signal strength. In this paper, proposed a new vertical handoff method for to decrease the number of signaling and registration processes, to examine the Special conditions such as WLAN black holes and to eliminate disconnecting effects. By estimating user locations related to WLAN position, interface on-times will be reduced which makes the power consuming of the system decreased. To indicate the efficiency of proposed approach the performance and the delay results are simulated.
Highlights
Non-homogenous networks are integrated of several networks with various technologies
Before disconnecting from the WLAN, the mobile node has to take decision when to start the handover to a 3G network
In a WLAN, a host may have a fixed and known IP address, so this version of Stream Control Transmission Protocol (SCTP) cannot be employed for vertical handover
Summary
Non-homogenous networks are integrated of several networks with various technologies. Since the mobile node switches to a cellular network before disconnecting from the WLAN, delay is an important problem while in the downward case delay sensitivity is low. Identifying the decline in signal strength is of high importance when the MN departs a WLAN In this case, before disconnecting from the WLAN, the mobile node has to take decision when to start the handover to a 3G network. Handover is often done in order to promote QoS, but the mobile node should not start handover too soon because it might depart the WLAN quickly and disconnect from UMTS as a consequence of inappropriate handover [4, 5]. In a WLAN, a host may have a fixed and known IP address, so this version of SCTP cannot be employed for vertical handover. Application requirements must be considered in the handover process [11]
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