A Context-Aware Access Network Selection Based on Utility-Function for Handover in WLAN-LTE Environment
Network selection plays an essential role in serving mobile users with the requisite Quality of Service (QoS) in the context of next generation networks (NGN). It boosts efficiently the use of radio resources in heterogeneous wireless networks environment
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Abstract Network selection plays an essential role in serving mobile users with the requisite Quality of Service (QoS) in the context of next generation networks (NGN). It boosts efficiently the use of radio resources in heterogeneous wireless networks environment. In order to be Always Best Connected in such environment that involve multiple networks with different access technologies, user’s preferences and QoS requirements need to be considered during the Vertical Handover process. To address this issue, this paper proposes a context-aware access network selection based on utility-function that takes into consideration user’s and QoS preferences. It aims at maximizing the user satisfaction while meeting application QoS when connecting to a target network. The proposed approach prioritizes networks with higher relevance to different types of applications and enables seamless connectivity to mobile user and applications. Thus, network resources are conveniently managed to support diverse services that might be considered by mobile users. Simulations results are provided to evaluate the performance of the proposed approach in low, medium and high mobility scenarios consisting in WLAN-LTE networks compared with the existing baseline scheme. Keywords Heterogeneous networks ⋅ Network selection ⋅ Always best connected ⋅ Context-awareness ⋅ Utility function ⋅ ns-3
M. Drissi (✉) ⋅ M. Oumsis ⋅ D. Aboutajdine LRIT, Associated Unit to CNRST URAC’29, Faculty of Sciences, Mohammed V University, Rabat, Morocco e-mail: [email protected] M. Oumsis e-mail: [email protected] D. Aboutajdine e-mail: [email protected] M. Oumsis High School of Technology, Mohammed V University, Rabat, Sale, Morocco © Springer Science+Business Media Singapore 2017 R. El-Azouzi et al. (eds.), Advances in Ubiquitous Networking 2, Lecture Notes in Electrical Engineering 397, DOI 10.1007/978-981-10-1627-1_5
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1 Introduction and Motivation In recent years, various types of wireless access technologies have been deployed including 3G, WLAN, WiMAX, LTE and LTE Advanced. The most promising Next Generation Networks (NGN) are the heterogeneous networks. They are based on the coexistence and interoperability of the different types of Radio Access Technologies, and support existing and emerging networks, introducing by that the concept of Always Best Connected (ABC) Concept. Authors of [1] assert that a terminal supports the ABC features means that it is not only always connected, but also connected through the best available network and access technology at all times. The ABC concept achieves a win-win partnership because it considers user’s and operator’s benefits. Indeed, Heterogeneous networks involve development of diverse paradigms of the concerned technologies, such as context-awareness of mobile devices. Communication in such environment has to cope with many provider’s constraints (e.g., strong fluctuations of Real-time traffic and dynamic network topology) and also it has to meet user’s application requirements (Fig. 1). In addition
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