Abstract
Multimode terminals designed for heterogeneous wireless networks (HWNs) have the capability to support two or more classes of calls simultaneously. When a multimode terminal having an ongoing call initiates a new class of call, the current radio access technology (RAT) may not support the new class of call thereby necessitating a vertical handoff to a RAT that can support both the current and the newly initiated call. However, vertical handoffs incur signaling overhead, handover delay, packet loss, and service disruption. Therefore, it is important to reduce the frequency of vertical handoffs in HWNs. This paper proposes a predictive algorithm that considers the current state and the possible future state of a multimode terminal in making RAT selection decisions, and thereby reduces the frequency of vertical handoffs in HWNs. The history of a user's call logs is used in making predictions about future states of the user's multimode terminal. The paper develops an analytical model to evaluate the performance of the proposed predictive RAT-selection algorithm, using a four-RAT HWN as an example, and considering three classes of calls namely voice, video, and data. Results show that the proposed predictive algorithm significantly reduces the frequency of vertical handoff calls when compared with non-predictive algorithm in HWNs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.