7 research outputs found
Integrated Management of Interface Power (IMIP) Framework
La prĂ©sence importante de plusieurs rĂ©seaux sans-fils de diffĂ©rentes portĂ©es a encouragĂ©e le dĂ©veloppement dâune nouvelle gĂ©nĂ©ration dâĂ©quipements portables sans-fils avec plusieurs interfaces radio. Ainsi, les utilisateurs peuvent bĂ©nĂ©ficier dâune large possibilitĂ© de connectivitĂ© aux rĂ©seaux sans-fils (e.g. Wi-Fi [1], WiMAX [2], 3G [3]) disponibles autour. Cependant, la batterie dâun nĆud mobile Ă plusieurs interfaces sera rapidement Ă©puisĂ©e et le temps dâutilisation de lâĂ©quipement sera rĂ©duit aussi. Pour prolonger lâutilisation du mobile les standards, des rĂ©seaux sans-fils, on dĂ©finie (individuellement) plusieurs Ă©tats (Ă©mission, rĂ©ception, sleep, idle, etc.); quand une interface radio nâest pas en mode Ă©mission/rĂ©ception il est en mode sleep/idle oĂč la consommation est trĂšs faible, comparĂ©e aux modes Ă©mission/rĂ©ception. Pourtant, en cas dâĂ©quipement portable Ă multi-interfaces radio, lâĂ©nergie totale consommĂ©e par les interfaces en mode idle est trĂšs importante. Autrement, un Ă©quipement portable Ă©quipĂ© de plusieurs interfaces radio augmente sa capacitĂ© de connectivitĂ© mais rĂ©duit sa longĂ©vitĂ© dâutilisation.
Pour surpasser cet inconvĂ©nient on propose une plate-forme, qu'on appelle IMIP (Integrated Management of Interface Power), basĂ©e sur lâextension du standard MIH (Media Independent Handover) IEEE 802.21 [4]. IMIP permet une meilleure gestion dâĂ©nergie des interfaces radio, dâun Ă©quipement mobile Ă multi-radio, lorsque celles-ci entrent en mode idle.
Les expĂ©rimentations que nous avons exĂ©cutĂ©es montrent que lâutilisation de IMIP permet d'Ă©conomiser jusqu'a 80% de l'Ă©nergie consommĂ©e en comparaison avec les standards existants. En effet, IMIP permet de prolonger la durĂ©e d'utilisation d'Ă©quipements Ă plusieurs interfaces grĂące Ă sa gestion efficace de l'Ă©nergie.The large availability of wireless networks of different ranges, has contributed to the development of new generation of handheld devices with multi-radio interfaces. Thus, the end-users are able to achieve ubiquitous and seamless connectivity across heterogeneous wireless networks (e.g., Wi-Fi [1], WiMAX [2] and 3G_LTE [3]). However, a mobile node with multi-radio interfaces has its battery energy consumed rapidly, which reduces the operation/usage time of the device. To improve battery usage, wireless network standards have defined (individually) different interface states (transmit, receive, idle, sleep, etc.); when an interface is not transmitting or receiving, it goes to sleep/idle state where energy consumption is very low compared to transmit and receive states. However, in the case of multi-radio handheld devices, the total energy consumed by the interfaces in sleep/idle state is significant. Thus, equipping a mobile device with multiple interfaces increases its seamless connectivity but reduces its operation/usage longevity.
To overcome this inconvenient, we proposed a framework, called IMIP (Integrated Management of Interface Power) that consists of an extension of MIH (Media Independent Handover) IEEE 802.21 standard [4]. IMIP allows a better power management of radio interfaces of a multi-radio mobile node; indeed, it reduces considerably energy consumption. The basic idea behind IMIP is to shut down any interface in idle mode and use a proxy that emulates the interface; the proxy wakes up the interface when it receives a connection request directed to this interface. IMIP requires at least one interface in active mode. Experiments show that using IMIP enables a saving of up to 80% of power consumption compared with existing power management standards. Thus, IMIP allows longer usage of multiple interface devices thanks to its effective energy management
Energy-efficient vertical handover parameters, classification and solutions over wireless heterogeneous networks: a comprehensive survey
In the last few decades, the popularity of wireless networks has been growing dramatically for both home and business networking. Nowadays, smart mobile devices equipped with various wireless networking interfaces are used to access the Internet, communicate, socialize and handle short or long-term businesses. As these devices rely on their limited batteries, energy-efficiency has become one of the major issues in both academia and industry. Due to terminal mobility, the variety of radio access technologies and the necessity of connecting to the Internet anytime and anywhere, energy-efficient handover process within the wireless heterogeneous networks has sparked remarkable attention in recent years. In this context, this paper first addresses the impact of specific information (local, network-assisted, QoS-related, user preferences, etc.) received remotely or locally on the energy efficiency as well as the impact of vertical handover phases, and methods. It presents energy-centric state-of-the-art vertical handover approaches and their impact on energy efficiency. The paper also discusses the recommendations on possible energy gains at different stages of the vertical handover process
Energy-efficient vertical handover parameters, classification and solutions over wireless heterogeneous networks: a comprehensive survey
In the last few decades, the popularity of wireless networks has been growing dramatically for both home and business networking. Nowadays, smart mobile devices equipped with various wireless networking interfaces are used to access the Internet, communicate, socialize and handle short or long-term businesses. As these devices rely on their limited batteries, energy-efficiency has become one of the major issues in both academia and industry. Due to terminal mobility, the variety of radio access technologies and the necessity of connecting to the Internet anytime and anywhere, energy-efficient handover process within the wireless heterogeneous networks has sparked remarkable attention in recent years. In this context, this paper first addresses the impact of specific information (local, network-assisted, QoS-related, user preferences, etc.) received remotely or locally on the energy efficiency as well as the impact of vertical handover phases, and methods. It presents energy-centric state-of-the-art vertical handover approaches and their impact on energy efficiency. The paper also discusses the recommendations on possible energy gains at different stages of the vertical handover process
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ReSCon '11, Research Student Conference: Book of Abstracts
The fourth SED Research Student Conference (ReSCon2011) was hosted over three days, 20-22 June 2011, in the Hamilton Centre at Brunel University. The conference consisted of technical presentations, a poster session and social events. which focused on current research being conducted within the School of Engineering and Design by postgraduate research students from the School. The conference is held annually, and ReSCon plays a key role in contributing to research and innovations within the School