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 inter-system 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.

系统间切换对于4G / 5G网络至关重要，因为这些异构无线网络（HWN）集成了具有不同性能水平的不同无线电接入技术。主要挑战之一是在这些技术之间进行小区重选和切换。在本文中，我们考虑了HWN的融合，例如与传统网络（如WCDMA，GSM和无线局域网）的集成第三代合作伙伴计划长期评估。我们提出无线接入技术间切换或系统间切换（ISHO）算法，以评估集成网络模型的性能。在提议的集成HWN中，已经研究了三种不同的现实切换场景。本文的目的是评估所提出的网络模型的系统间切换性能。我们所建议的网络模型的性能已使用所建议的ISHO算法进行了平均切换次数和决策延迟方面的研究。为了减少不必要的越区切换，避免乒乓效应并减少决策延迟，需要考虑其他参数，例如触发时间和磁滞值。