06-02-2013, 10:32 AM
Handover Decision Based on User Preferences in Heterogeneous Wireless Networks
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Abstract
A handover decision is a significant problem, in next generation of wireless networks (4G). This is exacerbated when the Handoff decision is driven by user preferences (mainly transmission cost and wireless interface power consumption), wireless environment constraints (access network availability and properties and client communication capabilities). In this paper we present a handoff decision based on user preferences which consider not only the traditional handover decision factor (RSS) but also user preferences, user profiles and other requirements. We introduce APBSW (Access Point Best Satisfied Weights) for selecting access network; our proposed methods, UPHO (User Preference Handoff) use a fuzzy logic-based inference system to process all appropriate context information, which satisfy the best user preferences.
The 4G or next generation networks consists of heterogeneous network managed by different operators like 2G, 3G mobile communication systems as well as Wireless LAN (WLAN), IEEE 802.16e (WiMax), satellite. Mobility management is one important issue in 4G network, when a mobile user is switch from one network to another network or base station to BS there a mechanism is used “Handover”. There are two types of handover; Horizontal handoff (HHO) and Vertical handoff (VHO).When the mobile users switching between the networks with the same technology (Wimax to WiMax) this process called HHO. In VHO the mobile users switched in different networks which have different technology (WiMax to WiFi). So in heterogeneous network vertical handoff decision (VHD) is mainly used for continuous service. In this paper, we focus on handover decisions which occur when a mobile device needs to choose a different access network to which to connect. Traditionally, handover decisions have been based on evaluation of the Received Signal Strength (RSS) at the mobile device to support Always-Best-Connected (ABC).However, the prospects of 4G include Seamless roaming and personalization. The latter refers to the method used to provide tailored services that are built on the individual preferences of users in a given context, automatically reflecting user’s needs in a specific situation. This user centric approach means that the applications and services in 4G will need to adapt to who the user is, the user’s interests and context. If the handoff decision does not serve the interests and preferences of the user, then it is not user centric. The user centricity of the handoff decision means the user specifies the context changes that trigger handoff and the network properties of the target network they wish to handoff to. This is based on their current context, profile and preferences. This paper presents a handover decision based on user preferences in heterogeneous networks. As we mentioned earlier, previous hand-over management has focused on always-best-connected (ABC). In our case, a handover decision uses the collected information as input to evaluate the available access networks and to select the network best capable of satisfying the user’s request at a particular time. We name such a network an Always-Best-Satisfying (ABS). However, current and future applications that wish to offer smart handover decisions for personalized services should consider ABC and ABS. The ABS network provides always-on-connectivity as well as giving the user the best service according to his or her preference at any time or place.
[attachment=49774]
Abstract
A handover decision is a significant problem, in next generation of wireless networks (4G). This is exacerbated when the Handoff decision is driven by user preferences (mainly transmission cost and wireless interface power consumption), wireless environment constraints (access network availability and properties and client communication capabilities). In this paper we present a handoff decision based on user preferences which consider not only the traditional handover decision factor (RSS) but also user preferences, user profiles and other requirements. We introduce APBSW (Access Point Best Satisfied Weights) for selecting access network; our proposed methods, UPHO (User Preference Handoff) use a fuzzy logic-based inference system to process all appropriate context information, which satisfy the best user preferences.
The 4G or next generation networks consists of heterogeneous network managed by different operators like 2G, 3G mobile communication systems as well as Wireless LAN (WLAN), IEEE 802.16e (WiMax), satellite. Mobility management is one important issue in 4G network, when a mobile user is switch from one network to another network or base station to BS there a mechanism is used “Handover”. There are two types of handover; Horizontal handoff (HHO) and Vertical handoff (VHO).When the mobile users switching between the networks with the same technology (Wimax to WiMax) this process called HHO. In VHO the mobile users switched in different networks which have different technology (WiMax to WiFi). So in heterogeneous network vertical handoff decision (VHD) is mainly used for continuous service. In this paper, we focus on handover decisions which occur when a mobile device needs to choose a different access network to which to connect. Traditionally, handover decisions have been based on evaluation of the Received Signal Strength (RSS) at the mobile device to support Always-Best-Connected (ABC).However, the prospects of 4G include Seamless roaming and personalization. The latter refers to the method used to provide tailored services that are built on the individual preferences of users in a given context, automatically reflecting user’s needs in a specific situation. This user centric approach means that the applications and services in 4G will need to adapt to who the user is, the user’s interests and context. If the handoff decision does not serve the interests and preferences of the user, then it is not user centric. The user centricity of the handoff decision means the user specifies the context changes that trigger handoff and the network properties of the target network they wish to handoff to. This is based on their current context, profile and preferences. This paper presents a handover decision based on user preferences in heterogeneous networks. As we mentioned earlier, previous hand-over management has focused on always-best-connected (ABC). In our case, a handover decision uses the collected information as input to evaluate the available access networks and to select the network best capable of satisfying the user’s request at a particular time. We name such a network an Always-Best-Satisfying (ABS). However, current and future applications that wish to offer smart handover decisions for personalized services should consider ABC and ABS. The ABS network provides always-on-connectivity as well as giving the user the best service according to his or her preference at any time or place.