October 01, 2017

Practical LTE and WiFi Coexistence Techniques Beyond LBT

  • Khawer M.
  • Ling J.
  • Lopez-Perez D.

Coexistence with WiFi is the key issue for unlicensed band LTE. The main coexistence mechanism is listen-before-talk, whereby radio frequency energy is sensed over a short period and compared to a threshold. Given the default energy thresholds, the energy sensing range is much less than the cell range. Either technology can experience a collision due to transmissions being below energy detection threshold. Currently, WiFi is agnostic to unlicensed band LTE. To improve coexistence, a relay-based communications channel is proposed whereby LTE announces its presence. Legacy WiFi APs may be programmed to interpret and respond by firmware upgrade. Higher performance for both networks is demonstrated via more effective radio frequency channel selection and adaptive energy detection thresholding.

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Recent Publications

January 01, 2019

Friendly, appealing or both? Characterising user experience in sponsored search landing pages

  • Bron M.
  • Chute M.
  • Evans H.
  • Lalmas M.
  • Redi M.
  • Silvestri F.

© 2017 International World Wide Web Conference Committee (IW3C2), published under Creative Commons CC BY 4.0 License. Many of today's websites have recognised the importance of mobile friendly pages to keep users engaged and to provide a satisfying user experience. However, next to the experience provided by the sites themselves, ...

January 01, 2019

Analyzing uber's ride-sharing economy

  • Aiello L.
  • Djuric N.
  • Grbovic M.
  • Kooti F.
  • Lerman K.
  • Radosavljevic V.

© 2017 International World Wide Web Conference Committee (IW3C2), published under Creative Commons CC BY 4.0 License. Uber is a popular ride-sharing application that matches people who need a ride (or riders) with drivers who are willing to provide it using their personal vehicles. Despite its growing popularity, there exist ...

January 01, 2019

The paradigm-shift of social spambots: Evidence, theories, and tools for the arms race

  • Cresci S.
  • Petrocchi M.
  • Pietro R.
  • Spognardi A.
  • Tesconi M.

© 2017 International World Wide Web Conference Committee (IW3C2), published under Creative Commons CC BY 4.0 License. Recent studies in social media spam and automation provide anecdotal argumentation of the rise of a new generation of spambots, so-called social spambots. Here, for the first time, we extensively study this novel ...