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One of the most important issues in wireless and mobile communication technologies is to provide seamless handoff when a mobile node(MN) moves between different access networks. In this paper we have taken Wi-Fi/WiMAX heterogeneous networks in to consideration and reviewed the various seamless handoff schemes for vertical handoff between Wi-Fi and WiMAX networks at different layers. We assume the...
In the recent years, Voice over Internet Protocol (VoIP) is the most popular technology and becomes a kind of killer application, and 802.11-based wireless Local Area network (WLAN) has been set up in many public places. People who use VoIP over WLAN can be more convenient. In the common WLANs, IEEE 802.11e WLAN can support VoIP with better Quality of Service (QoS), However, 802.11 lacks a flexible...
Currently, the vertical handover between different technologies presents a real challenge to overcome; the service interruptions during handover pose a real problem to users. In this paper we focus on this problem, and we propose the MSCTP protocol characterized by its multi-homing technique, as vertical handover mechanism between the IEEE 802.16e and the IEEE 802.11e networks, in order to reduce...
Inter-enterprise collaborative environments and applications enable users to utilize and manage voice, data and video services on a common IP-based network. As voice moves from its traditional separate network to having both user and trunk connections traverse the corporate IP network, the demands for uptime and quality of experience increase dramatically. When video-over-IP is layered onto the same...
Nowadays, wireless networks have been deploying everywhere, with IEEE 802.11 as the most popular standard. However, wireless resources are scarce and wireless condition varies often. These limitations are crucial for applications with tight QoS requirements such as video or voice over IP. To cope with the problems, the standard has provided many features including multi-rate capability, which is the...
Mobile ad hoc networks (MANETs) promise unique communication opportunities. The IEEE 802.11 standard has allowed affordable MANETs to be realised. However, providing quality of service (QoS) assurances to MANET applications is difficult due to the unreliable wireless channel, the lack of centralised control, contention for channel access and node mobility. One of the most crucial components of a system...
This paper discusses the inter-layer mobility and quality of service (QoS) support in a multi-tier Wireless Overlay Network (WON). It proposes integrated network architecture with layer manager for vertical handoff, switching and mobility management using Mobile IP protocol. Various functionalities of the Layer manager are implemented as modular blocks and are distributive over the gateways in each...
Recent mobile multimedia innovations evolved for the present society, is a mandatory requirement. To achieve this goal various forums have come forward with several design proposals to suit the group of applications in the Mobile multimedia networks (MMNs). In this regard, a new multi-protocol architecture for the medium access control is required to seamless mobile multimedia networking. Hence a...
The wireless network landscape is changing gradually from homogeneous to heterogeneous and future generation networks are envisioned to be a combination of diverse but complimentary access technologies, like GPRS, WCDMA/HSPA, LTE, WiMAX, and WLAN. One issue which has become apparent recently with the proliferation of different link layer technologies is how service providers can offer a consistent...
Nowadays, wireless network users demand support for different types of traffic combined with longer battery lifetime for their mobile devices. This work proposes a new medium control for wireless LANs as an alternative to the HCF (hybrid coordination function) scheme defined by the IEEE 802.11e workgroup. LEPOHA (low energy priority oriented hybrid access) is a complete medium access mechanism, it...
One main trend in 4th generation networks (4G) is to provide a common and scalable framework for seamless communication through a number of access technologies, wired and wireless, including unidirectional technologies such as DVB. In this paper we present an architecture for seamless mobility and QoS for the integration of unidirectional networks like DVB, featuring ubiquitous access and seamless...
The following topics are dealt with: IP network security; wireless security; network topology; power line communication; intelligent transportation; cryptography; P2P streaming; wireless communication; wireless channel; network traffic; routing protocol; security protocols; resource management; ad hoc network; wireless sensor network; MAC protocol; power control; QoS; scheduling; coding; modulation;...
This paper proposes a fast forward medium access control protocol (FFMAC) for quality-of-service (QoS) guarantee in multihop IEEE 802.11s wireless mesh networks with multiple channels. To the best of our knowledge, the proposed protocol is the first one which considers the multihop and multichannel issues simultaneously. It provides higher priority for real-time applications, while remaining the distributed...
This contribution addresses the case when live packet-switched video is used to enrich circuit-switched speech calls in mobile telephony. Circuit-switched and packet-switched transmissions generally operate on completely different transmission paths resulting in different QoS in terms of delay and loss rates. In this case, video and audio data recorded at the same time are not multiplexed together...
The next generation mobile handhelds need to focus on seamless Mobility and session continuity when the subscribers move frequently across different radio access networks. This paper presents a generic radio access abstraction layer (GRAAL) outlining the additional functionalities required at the mobile terminal that can decide on the fly for selecting the best radio access network according to the...
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