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RSS feed of ComSoc Technology NewsOptimization for Time-driven Link Sleeping Reconfigurations in ISP Backbone Networks
Energy efficiency in operational ISP networks has been regarded as an increasingly important research issue in recent years. Towards this end, network resource optimization through sleeping reconfiguration has been proposed to reduce energy consumption when the traffic demands are at their low levels. The strategy is to configure a subset of network devices to the sleep mode when it is not required for the network to work at its full capacity during the off-peak time. Proc. IEEE/IFIP Network Operations and Management Symposium (NOMS 2012)IT service outages: Shorter or Fewer?
Maintaining high availability is a sine qua non for today’s IT service providers. Customer demands are on the rise, and service outages in high-profile application areas such as credit card payment systems rapidly hit the news headlines. However, despite all the attention, the most popular concept of service availability is surprisingly crude, and often reduced to just a single figure (such as 99.98%). IEEE Transactions on Network and Service ManagementLeveraging Local Image Redundancy for Efficient Virtual Machine Provisioning
Image-based provisioning provides a fast and reliable mechanism for handling the demands of Cloud Computing. Typically, a Cloud data center contains a catalog of images in the image library, multiple hypervisors with inexpensive direct attached storage (where the instances are created), and a placement mechanism that allocates and reserves resources. Image-based provisioning is a deployment and activation mechanism that clones a “golden” read-only virtual machine (VM) image residing in the image library to create a new virtual machine instance on a hypervisor. The main steps of the provisioning process are: 1) selection of hypervisor based on a placement policy; 2) copying VM image from a storage server to the direct attached storage of the hypervisor, and 3) image activation to create an instance. The image copy from the storage server to the direct attached storage of the hypervisor is time consuming and network intensive, directly contributing to user perceived provisioning latency. Proc. IEEE/IFIP Network Operations and Management Symposium (NOMS 2012)Secure Communication in the Low-SNR Regime
Secure transmission of confidential messages is a critical issue in communication systems and especially in wireless systems. This article addresses the issue of secure communications using multiple transmit and multiple receive antennas using low power in a wireless system with eavesdroppers. One measure of security is the secrecy capacity, which is the maximum data rate that can be obtained without an eavesdropper being able to decode the communications. This paper derives the fundamental limits on the secrecy capacity in the low signal-to-noise ratio regime, showing the minimum energy required to send bits reliably and securely, which is important to conserve the battery life of wireless devices. IEEE Transactions on Information TheoryFramework for Intelligent Service Adaptation to User’s Context in Next Generation Networks
However, this level of Context Awareness can not be achieved with the current state of context sources. These sources (smartphones, sensor networks, online Web services, etc.) are fragmented and do not comply with any standard. An application wanting to retrieve the complete context picture of a user will need to specifically poll all of them, using different interfaces and formats, to retrieve the required data. This is not efficient by any means. IEEE Communications MagazineVoronoi Tessellation Based Interpolation Method for Wi-Fi Radio Map Construction
With the proliferation of smartphones and Wi-Fi hot spots, localization techiques based on radio fingerprinting is drawing great attention these days. Radio fingerprinting localization can achieve much higher accuracy than triangulation- or proximity-based localization, provided that an accurate radio map is available. Construction of such a radio map (known as calibration) usually requires tremendous time and efforts and new innovative ways to reduce these efforts are widely being pursued. IEEE Communications LettersEvolution of the Standards for Packet Network Synchronization
The evolution of telecom networks away from the traditional circuit switched structures towards the evolving next generation network with packet switching has changed the model from one of a carefully planned and engineered network towards one in which there is a greater expectation of automatic, self-configured operation a plug and play model. IEEE Communications MagazineA General Framework for Performance Analysis of Space Shift Keying (SSK) Modulation in the Presence of Gaussian Imperfect Estimations
Spatial Modulation (SM) is a promising multiple-input-multiple-output (MIMO) transmission technique that utilizes the spatial information in a novel fashion. At each time instance, only a single transmit antenna is activated among the set of existing transmit antennas to transmit either a fixed power (no constellation symbol), as in Space Shift Keying (SSK), or a constellation data symbol from the activated transmit antenna, as in conventional SM. IEEE Communications LettersSpectrum Monitoring during Reception in Dynamic Spectrum Access Cognitive Radio Networks
If a frequency band has primary and secondary users, then the cognitive radios of the secondary users must monitor the band and cease to transmit if a primary user's radio begins to transmit. Traditional methods require the secondary users to not transmit while they monitor for the emergence of primary user signals. This article proposes and analyzes techniques by which the secondary radios can continue transmitting during monitoring. IEEE Transactions on CommunicationsA survey on facilities for experimental internet of things research
The proliferation of an enlarged gamut of devices able to be directly connected to the Internet is leading to a new ubiquitous-computing paradigm. Indeed, the Internet has experienced a tremendous growth in the past three decades, evolving from a network of a few hundred hosts to a platform capable linking billions of “things” globally, including individual people as well as enterprises of various sizes, through computers and computerized devices of any conceivable size and capability and the applications running on them. IEEE Communications Magazine
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