Abstract
Nowadays, Over-The-Top (OTT) voice call service has become more popular than other Voice over Internet Protocol services provided by mobile operators due to cheaper costs. For devices with more than one network interfaces, the OTT software may need to handover between heterogeneous networks during a call. Unnecessary handover may lead to signal overload, especially in a Wi-Fi intensive area where users may handover frequently between Wi-Fi and cellular networks. For example, if the period between when a user handovers from Wi-Fi to Long Term Evolution (LTE) and when the user handovers from LTE back to Wi-Fi is too short to transmit voice data, the handover procedures between Wi-Fi and LTE can be considered unnecessary and power consuming. To tackle this issue, this paper proposes delay handover mechanism (DHM) to avoid the unnecessary handover procedures by postponing the timing to handover from Wi-Fi to LTE. We then propose an analytical model as well as a simulation model to investigate how many handovers can be reduced. The analytical model is validated against the simulation model. With extensive simulation experiments, the performance evaluation of DHM offers a guideline to configure parameters based on the trade-off between reduced handover ratio and packet loss rate. As a whole, DHM is an application-based mechanism for avoiding unnecessary handovers as well as cutting down LTE usages.
Highlights
Voice over Internet Protocol (VoIP) is a technique to transmit voice data through Internet Protocol (IP) networks
Network providers mainly promote Voice over LTE (VoLTE) and Voice over Wi-Fi (VoWiFi). The former utilizes Long Term Evolution (LTE) and the latter utilizes Wi-Fi to connect to Evolved Packet Core (EPC), 4G core networks
In this paper, we proposed a Delay Handover Mechanism to reduce the number of handovers in LTE and dense-deployment Wi-Fi Networks
Summary
Voice over Internet Protocol (VoIP) is a technique to transmit voice data through Internet Protocol (IP) networks. In terms of billing mechanism, OTT service does not charge a calling fee, but the users may be charged for the data transmission volume by their network providers. Both VoLTE and VoWiFi use the traditional time billing mechanism, which calculates calling fee based on the duration of the call. VOLUME 7, 2019 knowledge, no existing work focus on how OTT voice services deal with connection management in heterogeneous networks. Since OTT users are more tolerant to the delay and packet loss and more willing to use Wi-Fi than LTE, the OTT application is not necessary to renegotiate as soon as the status of network changes.
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