Workshop on LTE in Unlicensed Bands: Potentials and Challenges

Friday, 12 June 2015 • 09:00 – 18:00

WS-18: LTE in Unlicensed Bands: Potentials and Challenges

Organizers: Andrea Goldsmith (Stanford University, USA); Alireza Babaei and Jennifer Andreoli-Fang (CableLabs); Klaus Doppler (Nokia Research)

The exponential growth of mobile data traffic and the scarcity and costliness of licensed spectrum are driving mobile network operators to consider offloading at least part of their traffic onto the unlicensed spectrum. Most recently, the 3GPP is considering extending the use of LTE into the unlicensed spectrum as a seamless approach to enable traffic offload. This new approach is dubbed LTE Unlicensed (LTE-U). Compared to Wi-Fi, LTE-U offers MNOs a way to offload traffic onto the unlicensed spectrum with a technology that seamlessly integrates into their existing LTE evolved packet core (EPC). Furthermore, LTE-U promises higher throughout and spectral efficiency than Wi-Fi. However, LTE-U introduces new coexistence challenges for other technologies in the same unlicensed bands particularly for legacy Wi-Fi. The goal of this workshop is to bring together academics, researchers, and practitioners to discuss the opportunities, challenges and potential solutions for operation of LTE in the unlicensed bands.

Time ICC London Suite 1

Friday, June 12

09:00-09:05 WS-18: Welcome Session
09:05-10:30 WS-18-01: Keynote Talks
11:00-12:30 WS-18-02: Coexistence
14:30-16:00 WS-18-03: Fairness
16:30-18:00 WS-18-04: System Architecture

Friday, June 12

09:00 - 09:05

WS-18: Welcome Session

Chair: Jennifer Andreoli-Fang (CableLabs, USA)

09:05 - 10:30

WS-18-01: Keynote Talks

Chair: Jennifer Andreoli-Fang (CableLabs, USA)

Keynote 1- Spectrum Sharing: Games and Optimization Abstract: The wireless industry has been debating how to take advantage of hundreds of megahertz of unlicensed spectrum. Some promote WiFi based technologies; others have proposed to retool and deploy Long Term Evolution (LTE) technologies in unlicensed frequency bands. This talk starts with a brief overview of the regulatory framework for radio spectrum policy. Game theoretic models are then introduced to study the fundamental problem of spectrum sharing by strategic operators. Also discussed is a new optimization based framework for an operator to manage all available licensed and unlicensed spectrum in many cells to achieve the best quality of service. Keynote 2- Open Innovation in Unlicensed Spectrum: Implications of LTE-Unlicensed (LAA-LTE) Abstract: The purpose of the presentation is to illustrate some potential impact of LTE-U (or LAA-LTE) on WiFi performance and make the case for strong co-existence requirements. We will start with providing a high level background on LTE-U/LAA-LTE, explain the possible impacts on LTE-U/LAA-LTE on WiFi performance then explain the co-existence goals. We will also discuss LWA (LTE WLAN Aggregation) as a potential alternative allowing operators to leverage the unlicensed spectrum while providing for better co-existence with WiFi. We will conclude with a summary of the main takeaways and asks.

11:00 - 12:30

WS-18-02: Coexistence

Chair: Alireza Babaei (CableLabs, USA)
Coexistence of WiFi and LTE in Unlicensed Bands: A Proportional Fair Allocation Scheme
Cristina Cano and Douglas Leith (School of Computer Science and Statistics. Trinity College Dublin, Ireland)
pp. 10350-10355
Coexistence of Pico- and Femto-Cellular LTE-Unlicensed with Legacy Indoor Wi-Fi Deployments
Andra M. Voicu, Ljiljana Simić and Marina Petrova (RWTH Aachen University, Germany)
pp. 10356-10362
Modeling the Coexistence of LTE and WiFi Heterogeneous Networks in Dense Deployment Scenarios
Shweta Sagari and Ivan Seskar (WINLAB, Rutgers University, USA); Dipankar Raychaudhuri (Rutgers University, USA)
pp. 10363-10368
Learning-based Coexistence for LTE Operation in Unlicensed Bands
Oriol Sallent (Universitat Politècnica de Catalunya, Spain); Jordi Pérez-Romero (Universitat Politècnica de Catalunya (UPC), Spain); Ramon Ferrús and Ramon Agustí (Universitat Politècnica de Catalunya, Spain)
pp. 10369-10375

14:30 - 16:00

WS-18-03: Fairness

Chair: Jennifer Andreoli-Fang (CableLabs, USA)
How Loud to Talk and How Hard to Listen-Before-Talk in Unlicensed LTE
Pengfei Xia (Tongji University, USA); Zi Teng (Tongji University, P.R. China); Jun Wu (Tongji University China, P.R. China)
pp. 10376-10381
LTE with Listen-Before-Talk in Unlicensed Spectrum
Jeongho Jeon (Intel Corporation, USA); Huaning Niu (Intel, USA); Qian (Clara) Li (Intel Corporation, USA); Apostolos Papathanassiou (Intel Corporation & Intel Architecture Group, USA); Geng Wu (Intel Corporation, USA)
pp. 10382-10386
Coexistence of Wi-Fi and LAA-LTE: Experimental Evaluation, Analysis and Insights
Yubing Jian, Chao-Fang Shih, Bhuvana Krishnaswamy and Raghupathy Sivakumar (Georgia Institute of Technology, USA)
pp. 10387-10393
A Channel Sensing Based Design for LTE in Unlicensed Bands
Baoan Jia and Meixia Tao (Shanghai Jiao Tong University, P.R. China)
pp. 10394-10399

16:30 - 18:00

WS-18-04: System Architecture

Chair: Alireza Babaei (CableLabs, USA)
A Spectrum Etiquette Protocol and Interference Coordination for LTE in Unlicensed Bands (LTE-U)
Hao Song (School of Information Science and Technology, Southwest Jiaotong University, P.R. China); Xuming Fang (Southwest Jiaotong University, P.R. China)
pp. 10400-10405
Extending LTE to Unlicensed Band – Merit and Coexistence
Mingxi Fan (Qualcomm, Inc., USA); Ahmed Sadek (Qualcomm, USA); Tamer Kadous (QUALCOMM Technology Inc., USA); Heechoon Lee (Qualcomm Technology Inc., USA); Kai Tang (Qualcomm Technlogy Inc., USA)
pp. 10406-10411
System Architecture and Coexistence Evaluation of Licensed-Assisted Access LTE with IEEE 802.11
Amitav Mukherjee and Jung-Fu (Thomas) Cheng (Ericsson Research, USA); Sorour Falahati (Ericsson Research, Sweden); Laetitia Falconetti (Ericsson Research, Germany); Anders Furuskar (Ericsson AB, Sweden); Bruhtesfa Godana (Ericsson Research, Sweden); Du Ho Kang (Ericsson, Sweden); Havish Koorapaty (Ericsson Research, USA); Daniel Larsson and Yu Yang (Ericsson Research, Sweden)
pp. 10412-10417