Now showing 1 - 3 of 3
  • Publication
    EDAS– Energy-Efficient Device-based Adaptive Cross-Layer Scheme for Wireless Multimedia Transmission
    Next generation wireless networks are poised to support real-time video-on-demand and high quality multimedia streaming applications. In order to support them, several adaptation strategies have been proposed at different layers of the OSI network stack. Also, certain cross-layer strategies across physical/data link and transport/application layers have been proposed over the years. However, given the battery constraints of a smartphone, it is imperative that new cross-layer design be developed that would bring into account an energyoriented mechanism from a device perspective. In this paper, a new adaptive solution, EDAS – energy-efficient device oriented adaptive cross-layer scheme for multimedia transmission in wireless network environments is proposed. Importantly, EDAS provides a novel framework spanning across several OSI layers that would dynamically vary the energy consumption in mobile devices while maintaining a high peak signal to noise ratio (PSNR) in order to ensure a good video quality. It has been observed that EDAS significantly outperforms other schemes in terms of PSNR, loss-rate and importantly, the energy consumption in device.
  • Publication
    ABI: A mechanism for increasing video delivery quality in multi-radio Wireless Mesh Networks with Energy Saving
    Wireless Mesh Networks (WMNs) are becoming increasingly popular mostly due to their ease of deployment. One of the main drawbacks of these networks is that they suffer with respect to Quality of Service (QoS) provisioning to its clients. Equipping wireless mesh nodes with multiple radios for increasing the available bandwidth has become a common practice nowadays due to the low cost of the wireless chipsets. Even though the available bandwidth increases with each radio deployed on the mesh node, the energy consumed for transmission increases accordingly. Thus, efficient usage of the radio interfaces is a key aspect for keeping the energy consumption at low levels while keeping a high QoS level for the mesh network’s clients. In the light of the above presented aspects concerning WMNs, the contribution of this paper is two-fold: (i) ABI, a mechanism for efficient usage of the available bandwidth for the mesh nodes, and (ii) decreasing the energy consumption by activating the radios only when needed. The solution proposed is throughly evaluated and shows that the two contributions can provide good QoS and decrease the overall energy consumption.
      185Scopus© Citations 3
  • Publication
    An Energy-efficient Mechanism for Increasing Video Quality of Service in Wireless Mesh Networks
    The continuous growth in user demand for high-quality rich media services puts pressure on Wireless Mesh Network (WMN) resources. Solutions such as those which increase the capacity of the mesh network by equipping mesh routers with additional wireless interfaces provide better Quality of Service (QoS) for video deliveries, but result in higher overall energy consumption for the network. This paper presents LBIS, a distributed solution which combines the benefits of both load-balancing and interface-shifting in order to enhance QoS levels for video services delivered over multi-hop WMNs, while maintaining low energy consumption levels within the network. Simulation-based results show very good performance of our proposed mechanism in terms of QoS metrics (delay, packet loss), Peak Signal-to Noise Ratio (PSNR) and energy consumption in mesh network topologies, and with varying video traffic loads and distributions. The results demonstrate how LBIS can increase the QoS for video deliveries by more than 30% at the cost of an insignificant increase of the overall network energy consumption compared to the WMN with multiple radio interfaces without the LBIS adaptation.