Heterogeneous Wireless Networks: Configuration and Vertical Handoff Management

Smaoui, Ikram; Zarai, Faouzi; Banat, Mohammad M.; Kamoun, Lotfı

doi:10.1007/s11277-009-9733-0

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Apart from the recent IEEE 802.21 standard, novel techniques for seamlessly switching from a serving network to a candidate network have been proposed, especially in order to minimize the handover latency and enhance network performance. For example, vertical handovers issues have been investigated through radio resource management techniques to minimize unnecessary (and unwanted) handovers [19], [20], [21]. At the same time, forced vertical handovers may be imposed on certain groups of users to free up resources in the network, so as to admit more suitable users.…”

Section: Related Workmentioning

confidence: 99%

A hybrid (N/M)CHO soft/hard vertical handover technique for heterogeneous wireless networks

Vegni

Natalizio

2014

Ad Hoc Networks

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In this paper we investigate the potentiality and the benefits of a soft Vertical Handover (VHO) mechanism, compared with the traditional hard approach. More specifically, we present an analytical scheme for seamless service continuity in a heterogeneous network environment, modeled by means of a multi-dimension Markov chain. The call blocking probabilities, as well as the soft and hard vertical handover probabilities, are computed for specific networks (i.e., UMTS and WLAN). We propose a soft/hard VHO technique working either as (i) a Mobile Controlled Handover, on the basis of a reward and cost model, which consider the data rate and the bandwidth allocation, or (ii) as a simple Network Controlled Handover scheme, by assuming a probabilistic approach as the handover decision metric. Simulation results validate the benefits of the proposed handover algorithm when operating in soft mode, which outperforms the traditional hard approach in terms of network performance and limitation of unwanted and unnecessary handovers. Finally, the effectiveness of the proposed approach is proven with respect to other single and multi-parameter VHO techniques, by extensive simulations.

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Section: Related Workmentioning

confidence: 99%

A hybrid (N/M)CHO soft/hard vertical handover technique for heterogeneous wireless networks

Vegni

Natalizio

2014

Ad Hoc Networks

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“…This solution defines the context provided by networks and the user but not define how interpret the context to make the adequate decision. Authors in [14] define a novel architecture Hybrid Interworking Unit (HIU) of a serving node as a bridge between two different access networks to 7 enable integration of various heterogeneous networks. They consider the Signal to Interference Ratio (SIR), the mobile station velocity, the user preferences, the applications requirements and the terminal capabilities to make vertical handover decision and optimize the handover initiation time as well as the selection of the most optimal network.…”

Section: Related Workmentioning

confidence: 99%

Context Awareness and Class of Service Satisfaction for Modeling Handover Decision-Making

Maaloul¹,

Afif²,

Tabbane³

2012

IJCA

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The next generation mobile system is expected to support the continuous increase of users requirements. Through the high flow rates of these networks, new applications constraints are more complex and may be change dynamically and rapidly for wireless systems. The service heterogeneity provided by these applications has a great influence on system performance in terms of ability, availability and the context aware provided to make handover decision. To facilitate the negotiation process between the user and the network, we define some class of service that guarantees QoS for interworking between 3GPP and non-3GPP networks and the critical context criteria which influence the handover decision. In this context, our proposed approach supports the interaction between context-aware and class of service considering the use of the particular features of each class of service to make handover decision and providing the application required QoS. In this paper we conceive a new approach, called Enhance Simple Additive Weighting, for network selection that reduces computational complexity, the handover latency and eliminates networks which do not satisfy a minimum requirement compared to other existing approaches based on AHP strategy.

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“…To avoid call dropping during communication in WiMAX networks, Sridevi et al introduced a dwell timer in BSs to prevent ping-pong handovers [16]. Smaoui et al proposed the dwell timer concept in their VHO decision algorithm to minimize handoff costs by reducing unnecessary and unbeneficial handoffs [17]. To ensure the proper operation of handover decision parameters, Li et al adjusted the timeto-trigger (TTT) according to the speed of MT.…”

Section: Introductionmentioning

confidence: 99%

Channel adaptive dwell timing for handover decision in VLC-WiFi heterogeneous networks

Bao

Okine

Adjardjah

et al. 2018

J Wireless Com Network

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The coexistence of visible light communication (VLC) and WiFi elevates indoor wireless communications beyond 4G, by utilizing VLC for high-rate transmission and ensuring reliable mobile connectivity through WiFi. Nevertheless, the high susceptibility of VLC-line-of-sight (VLC-LoS) channel to blocking can result in excessive number of handovers between VLC and WiFi networks leading to huge signaling cost and degradation in overall system performance. Therefore, an efficient inter-system handover scheme is required for a successful integration of the two access technologies. To this end, a channel adaptive dwell vertical handover (CAD-VHO) scheme is presented, in this article, as an improvement on static D-VHO scheme. The width of the dwell timer employed in our scheme is altered based on the rate of blocking and recovery of VLC-LoS channel. As a result, the proposed CAD-VHO scheme is adaptive to the rate and extent of obstruction of VLC-LoS link due to user mobility and surrounding objects. Simulation scenario was set up as a dynamic network environment in an indoor setting with restless and stationary mobile terminals and surrounding mobile object. Based on the simulation results obtained, the CAD-VHO scheme can reduce the number of VHOs by as much as 80% whiles achieving a higher average data rate in most cases. Consequently, the proposed CAD-VHO scheme is highly efficient in minimizing VHO signaling cost and enabling a superior broadband service.

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Heterogeneous Wireless Networks: Configuration and Vertical Handoff Management

Cited by 10 publications

References 26 publications

A hybrid (N/M)CHO soft/hard vertical handover technique for heterogeneous wireless networks

A hybrid (N/M)CHO soft/hard vertical handover technique for heterogeneous wireless networks

Context Awareness and Class of Service Satisfaction for Modeling Handover Decision-Making

Channel adaptive dwell timing for handover decision in VLC-WiFi heterogeneous networks

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