CS Forum: "Coexistence of LTE with WiFi in unlicensed spectrum" Suzan Bayhan

CS department's public guest lecture, open to everyone free-of-charge.

Suzan Bayhan
TU Berlin, Telecommunications Networks Department (TKN)

Host: Professor Mario Di Francesco
Time: 10:30 (coffee at 10:15)
Venue: T5, CS building

Coexistence of LTE with WiFi in unlicensed spectrum

Abstract:

LTE operators have recently started to explore various options to expand their capacity leveraging unlicensed spectrum as license-exempt bands require no licensees and are open to every one’s use under certain regulations. One option, known as LTE-unlicensed (LTE-U), lets LTE operators aggregate carriers from licensed and unlicensed spectrum to boost their downlink capacity. However, unlicensed spectrum, e.g., 5GHz, is used already by WiFi, which is arguably the most successful wireless networking technology and hence is of paramount importance. But, LTE is not designed with unlicensed spectrum sharing in mind as opposed to WiFi which is coexistence-friendly thanks to its listen-before-talk approach. Therefore,coexistence of LTE with WiFi is not straightforward. In my talk, I will first describe coexistence of LTE-U and WiFi with a brief overview of the literature, and later introduce how we can improve the existing solutions by leveraging the multiple antennas at the LTE-U BS, namely via interference-nulling. Our approach, so-called coexistence gaps in space, extends the time-domain coexistence gaps in LTE-U to an additional dimension, i.e., space domain coexistence gaps. In the last part of my talk, I will present our prototype Xzero, which, to the best of our knowledge, is the first practical solution for LTE-WiFi cross-technology interference nulling.

Short bio:

Suzan Bayhan received her PhD in computer engineering in 2012 from Bogazici University, Istanbul. Between 2012-2016, she was a postdoctoral researcher at the University of Helsinki. Currently, she is a senior researcher at TKN, TU Berlin and also a Docent in computer science at the University of Helsinki. She received the Google Anita Borg EMEA scholarship in 2009 and co-authored the best paper at ACM ICN 2015. Suzan is on N2Women Board as one of the mentoring co-chairs. Her current research interests include resource allocation in wireless networks, coexistence in the unlicensed spectrum, information-centric networks, and edge/fog communications.