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- research-articleFebruary 2021
Coverage and rate analysis for 5G‐heterogeneous network: β‐Ginibre point process
IET Communications (CMU2), Volume 14, Issue 22Pages 4048–4056https://doi.org/10.1049/iet-com.2020.0599Stochastic geometry is emerging as tractable solution and attractive approach to evaluate the performance of 5G heterogeneous network (5G‐Hetnet) such as coverage, outage and rate probability. The base stations (BSs) and fading distribution in 5G‐Hetnet ...
- research-articleJanuary 2020
An Internet-less World?: Expected Impacts of a Complete Internet Outage with Implications for Preparedness and Design
Proceedings of the ACM on Human-Computer Interaction (PACMHCI), Volume 4, Issue GROUPArticle No.: 03, Pages 1–24https://doi.org/10.1145/3375183In HCI research, non-use of systems, especially involuntary loss of use, is a relatively neglected topic. How do people perceive the impacts on their lives should the Internet go out for an extended period of time? Would it be a minor inconvenience or ...
- research-articleOctober 2019
On the Outage Probability of Millimeter Wave Links with Quasi-deterministic Propagation
mmNets '19: Proceedings of the 3rd ACM Workshop on Millimeter-wave Networks and Sensing SystemsOctober 2019, Pages 1–6https://doi.org/10.1145/3349624.3356762Millimeter waves are emerging as a key technology for future wireless communication systems and networks. The low transmission power allowed by regulation requires high gain steerable antenna arrays to generate directional links that can support high ...
- research-articleNovember 2017
Pinpointing delay and forwarding anomalies using large-scale traceroute measurements
IMC '17: Proceedings of the 2017 Internet Measurement ConferenceNovember 2017, Pages 15–28https://doi.org/10.1145/3131365.3131384Understanding data plane health is essential to improving Internet reliability and usability. For instance, detecting disruptions in distant networks can identify repairable connectivity problems. Currently this task is difficult and time consuming as ...
- research-articleMarch 2017
A Smart Approach for Intentional Islanding based on Dynamic Selection Algorithm in Microgrid with distributed generation
BDCA'17: Proceedings of the 2nd international Conference on Big Data, Cloud and ApplicationsMarch 2017, Article No.: 55, Pages 1–7https://doi.org/10.1145/3090354.3090410The electricity distribution system provides major opportunities for smart grid because of its important role of distributing electrical power from the main grid to users, it has the potential to supply electricity during grid outages. An outage or ...
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- posterFebruary 2017
Wait, Did You Say No Internet?: An Exploratory Study of the Perceived Impact of Internet Outage
CSCW '17 Companion: Companion of the 2017 ACM Conference on Computer Supported Cooperative Work and Social ComputingFebruary 2017, Pages 231–234https://doi.org/10.1145/3022198.3026332Use of the Internet is widespread both in social and work contexts. In this research we explore people's perceptions of their reliance on Internet technologies and response to a scenario of Internet outage. Data from a survey (N= 1070) shows that ...
- short-paperNovember 2016
Optical Layer Failures in a Large Backbone
IMC '16: Proceedings of the 2016 Internet Measurement ConferenceNovember 2016, Pages 461–467https://doi.org/10.1145/2987443.2987483We analyze optical layer outages in a large backbone, using data for over a year from thousands of optical channels carrying live IP layer traffic. Our analysis uncovers several findings that can help improve network management and routing. For instance,...
- articleJuly 2016
Performance of cognitive relay network with novel hybrid spectrum access schemes with imperfect CSI
International Journal of Communication Systems (IJOCS), Volume 29, Issue 11July 2016, Pages 1761–1776https://doi.org/10.1002/dac.3142Two novel spectrum access schemes, a hybrid spectrum access scheme HSAS and a modified HSAS combining underlay mode and overlay mode, are proposed for a relay based cognitive radio CR network. The CR employs the underlay mode with imperfect channel ...
- articleNovember 2015
Performance analysis of an opportunistic multi-user cognitive network with multiple primary users
Wireless Communications & Mobile Computing (WCMC), Volume 15, Issue 16November 2015, Pages 2004–2019https://doi.org/10.1002/wcm.2478Consider a multi-user underlay cognitive network where multiple cognitive users concurrently share the spectrum with a primary network with multiple users. The channel between the secondary network is assumed to have independent but not identical ...
- research-articleSeptember 2013
A dual-band MAC protocol for indoor cognitive radio networks: an e-health case study
BodyNets '13: Proceedings of the 8th International Conference on Body Area NetworksSeptember 2013, Pages 547–552https://doi.org/10.4108/icst.bodynets.2013.253619The importance of wireless technology in modern medicine has increased in the last years. It is anticipated that a large number of wireless communication devices for e-health will operate in unlicensed frequency bands in indoor environments. This ...
- ArticleApril 2013
A Case Study on the Effects of Predicted Wind Farm Power Outputs on Unscheduled Flows in Transmission Networks
GREENTECH '13: Proceedings of the 2013 IEEE Green Technologies ConferenceApril 2013, Pages 277–284https://doi.org/10.1109/GreenTech.2013.50The impact of forecasting error in wind power on unscheduled flows (USFs) is investigated here. Normal distribution is used to model the forecasting error distribution. Upper and lower bounds on wind farm output with a positive correlation of errors are ...
- ArticleSeptember 2012
Performance of Multiuser TAS/MRC Systems with a High Selection Gain in Severe Fading Channels
IBICA '12: Proceedings of the 2012 Third International Conference on Innovations in Bio-Inspired Computing and ApplicationsSeptember 2012, Pages 258–261https://doi.org/10.1109/IBICA.2012.11This paper investigates the performance of multiuser Transmit Antenna Selection/Maximal-Ratio Combining (TAS/MRC) systems with a high selection gain in severe Nakagami-m fading channels. First, the amount of fading (AF) is derived as closed-form ...
- ArticleSeptember 2012
Energy-Efficient Base Stations Locations Optimisation in an Airport Environment
NGMAST '12: Proceedings of the 2012 Sixth International Conference on Next Generation Mobile Applications, Services and TechnologiesSeptember 2012, Pages 199–204https://doi.org/10.1109/NGMAST.2012.42Optimising the locations of base stations (BSs) is very challenging in highly dynamic environments such as airports, shopping malls and train stations where both spatial and temporal traffic variations are considerably high. Due to the continuous growth ...
- research-articleNovember 2011
Pingin' in the rain
IMC '11: Proceedings of the 2011 ACM SIGCOMM conference on Internet measurement conferenceNovember 2011, Pages 19–28https://doi.org/10.1145/2068816.2068819Residential Internet connections are susceptible to weather-caused outages: Lightning and wind cause local power failures, direct lightning strikes destroy equipment, and water in the atmosphere degrades satellite links. Outages caused by severe events ...
- research-articleAugust 2011
Outage on the table: the design of interactive surfaces for collaborative operation in outage control centres
ECCE '11: Proceedings of the 29th Annual European Conference on Cognitive ErgonomicsAugust 2011, Pages 61–64https://doi.org/10.1145/2074712.2074725Motivation Outage in an industrial plant is an activity that takes place at regular intervals and demands the effort and commitment of the whole operating organization. The main objective is to carry out this collaborative activity in an efficient and ...
- articleAugust 2011
Outage probability of general ad hoc networks in the high-reliability regime
IEEE/ACM Transactions on Networking (TON), Volume 19, Issue 4Pages 1151–1163https://doi.org/10.1109/TNET.2010.2100099Outage probabilities in wireless networks depend on various factors: the node distribution, the MAC scheme, and the models for path loss, fading, and transmission success. In prior work on outage characterization for networks with randomly placed nodes, ...
- articleDecember 2010
Performance of an AFC loop in the presence of a single interferer in a fading channel
IEEE Transactions on Communications (TC), Volume 58, Issue 12December 2010, Pages 3386–3391https://doi.org/10.1109/TCOMM.2010.093010.090216The performance of an automatic frequency control (AFC) loop is investigated using two measures, the mean time to loss of lock and the average switching rate. The AFC is considered to operate in fading while a single interferer is also present at its ...
- research-articleAugust 2010
The relay selection and transmission trade-off in cooperative communication systems
IEEE Transactions on Wireless Communications (TWC), Volume 9, Issue 8August 2010, Pages 2505–2515A common and practical paradigm in cooperative communication systems is the use of a dynamically selected 'best' relay to decode and forward information from a source to a destination. Such systems use two phases - a relay selection phase, in which the ...
- articleJuly 2010
Minimum-outage broadcast in wireless networks with fading channels
IEEE Communications Letters (CL), Volume 14, Issue 7July 2010, Pages 617–619https://doi.org/10.1109/LCOMM.2010.07.100421We consider the problem of cooperative broadcasting for minimum outage in wireless networks. We consider wireless multihop broadcast as a set of transmitters that transmit in a certain order. The receiving nodes are able to combine all the previous ...
- articleApril 2010
Max-matching diversity in OFDMA systems
IEEE Transactions on Communications (TC), Volume 58, Issue 4April 2010, Pages 1161–1171https://doi.org/10.1109/TCOMM.2010.04.080478This paper considers the problem of optimal subcarrier allocation in OFDMA systems to achieve the minimum outage probability while guaranteeing fairness. The optimal subcarrier allocation algorithm and the maximum frequency diversity gain are both ...