Adaptive Listen-Before-Talk (LBT) scheme for LTE and Wi-Fi systems coexisting in unlicensed band

Chung K. Kim, Chan S. Yang, Chung Gu Kang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

25 Citations (Scopus)

Abstract

Listen-Before-Talk (LBT) protocol is an essential mechanism that allows Wi-Fi and LTE systems to share the unlicensed band while maintaining the performance of each individual system. However, a conventional LBT mechanism in this coexisting environment operates with the fixed channel occupancy time (COT) even under the varying traffic load in each system. In practice, if COT is set too short or large, one of two systems becomes inefficient when it is overloaded. Furthermore, Wi-Fi and LTE systems operate with different back-off mechanisms, which may violate the requirement of fair-coexistence. It implies that the operational parameters in LBT protocol must be dynamically adapted to the varying traffic load and back-off window size of Wi-Fi system. Toward this end, we propose an adaptive LBT protocol that can increase the overall system throughput without compromising a performance of the Wi-Fi system in the coexisting environment. Two different adaptation mechanisms, on-off adaptation for COT of LTE system and short-long adaptation for idle time (IT), are designed to implement the adaptive LBT scheme. Our simulation results demonstrate that the overall system throughput can be improved by 30-105% depending on the traffic load, while warranting the performance of the Wi-Fi system.

Original languageEnglish
Title of host publication2016 13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages589-594
Number of pages6
ISBN (Print)9781467392921
DOIs
Publication statusPublished - 2016 Mar 30
Event13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016 - Las Vegas, United States
Duration: 2016 Jan 62016 Jan 13

Other

Other13th IEEE Annual Consumer Communications and Networking Conference, CCNC 2016
CountryUnited States
CityLas Vegas
Period16/1/616/1/13

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Networks and Communications
  • Hardware and Architecture

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