Inter Radio Access Technology [IRAT] Handover Algorithms for Heterogeneous Wireless Networks
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Inter Radio Access Technology [IRAT] Handover Algorithms for Heterogeneous Wireless Networks S. Reddy Vamshidhar Reddy1 · Sanjay Dhar Roy1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Inter-system handover is important for 4G/5G networks as these heterogeneous wireless networks (HWNs) have integrated different radio access technologies with diverse levels of performance. One of the major challenges is to make cell reselection and handover between these technologies. In this paper, we considered convergence of HWNs such as an integrated 3rd generation partnership project long term evaluation with legacy networks like WCDMA, GSM and a wireless local area network. We propose inter-radio access technology hand off or inter-system handoff (ISHO) algorithms to evaluate the performance of integrated network model. Three different realistic handoff scenarios have been investigated in the proposed integrated HWN. The aim of this paper is to evaluate the intersystem handover performance for the network model proposed. The performance of our proposed network model has been carried out using proposed ISHO-algorithms in terms of the average number of handoffs and decision delay. To reduce the unnecessary handoffs, to stave off the ping-pong effect and to lessen the decision delay, additional parameters such as time to trigger and hysteresis values are considered. Keywords HWNs · Rats · Inter-system handovers · WLAN · E-UE of interest · Standard deviation of shadowing term · Measurement report message (MRM) · Event 3a
1 Introduction With the upcoming revolution in wireless communication technologies, the next generation mobile network (NGMN) is envisioned as the integration of existing multiple radio access technologies (RATs) which are having diverse levels of performance, so-called heterogeneous networks (HetNet) [1]. It is so complex towards the fifth generation (5G) network which is expected to be launched in 2020 [2], incorporates legacy cellular networks such as global communication system for mobile (GSM) 2G networks, Wideband Code Division * S. Reddy Vamshidhar Reddy [email protected] Sanjay Dhar Roy [email protected] 1
Department of Electronics and Communication Engineering, National Institute of Technology, Durgapur, Durgapur, West Bengal 713209, India
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S. R. V. Reddy, S. D. Roy
Multiple Access (WCDMA) 3G networks with long term evolution (LTE) 4G networks and with other wireless technologies like short range networks, for e.g., wireless local area network (WLAN) [3]. Integration of these networks has given renaissance and it is unavoidable to full fill user’s ultimate demands like seamless roaming, anywhere–anytime, high data rates required for multimedia and broadband applications. Transition of user’s on-going session from one radio network to other network is called handoff. If these two networks belong to the same type network then it is referred as horizontal handoff (HHO) [4] else if they belong to the different radio access technologie
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