Abstract
Multiple wireless access technology has been embedded into a single mobile device as a fundamental feature, aiming to give end users ubiquitous access at any time. To allow the users to enjoy the ubiquitous connectivity, the mobile device has to consume higher energy for the simultaneous activation of multiple wireless interface and the continuous connectivity. In addition, a seamless vertical handover between the access technologies is a mandatory requirement to insure the quality, reliability and continuity of real time services. In this paper, the continuity of real time services as well as energy saving for mobile devices has been taken into account. The conceptual idea is that whenever traffic rate is lower than a threshold it will be smoothly handed over to a low energy consumption technology, i.e., Bluetooth. When the traffic exceeds the limitation of Bluetooth bandwidth, it will be handed over to a wider bandwidth technology, i.e., Wi-Fi. In the considered scenarios, the technologies are not interconnected; hence, the vertical handover management must be fully controlled by the mobile devices. The performance of the system including energy saving and maintaining the continuity of real time services has been evaluated by direct measurements in a real testbed.
Highlights
The concurrent of multiple wireless access technology in a mobile device allows end users to be always best connected anywhere and anytime [1]
Multiple wireless access technology has been embedded into a single mobile device as a fundamental feature, aiming to give end users ubiquitous access at any time
The results show that, even in the worst case, multiple successful vertical handover (VHO) can save energy at least 11.28%
Summary
The concurrent of multiple wireless access technology in a mobile device allows end users to be always best connected anywhere and anytime [1]. The continuous connectivity of real time services commonly requires the wireless interface to be awake to receive and send data This will lead to higher energy consumption on the mobile device which is generally a battery-powered one. Other attempts tried to eliminate the energy consumed during sleeping period by turning off the Wi-Fi interface [3] [4] These works, require another technology, which is assumed to be interconnected with the WLAN network, to wake the Wi-Fi interface up. The process of changing the wireless technology, called a vertical handover (VHO), must be seamless to support real time services. As an extension of our previous work, in this paper, a mobile-controlled VHO is proposed to support mobile devices to save energy and to maintain the continuity of real time services in non-interconnected wireless networks.
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