Dynamic uplink-downlink optimization in TDD-based small cell networks

Mohammed S. Elbamby, Mehdi Bennis, Walid Saad, Matti Latva-Aho

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

30 Scopus citations

Abstract

Dynamic Time-division duplex (TDD) can provide efficient and flexible splitting of the common wireless cellular resources between uplink (UL) and downlink (DL) users. In this paper, the UL/DL optimization problem is formulated as a noncooperative game among the small cell base stations (SCBSs) in which each base station aims at minimizing its total UL and DL flow delays. To solve this game, a self-organizing UL/DL resource configuration scheme for TDD-based small cell networks is proposed. Using the proposed scheme, an SCBS is able to estimate and learn the UL and DL loads autonomously while optimizing its UL/DL configuration accordingly. Simulations results show that the proposed algorithm achieves significant gains in terms of packet throughput in case of asymmetric UL and DL traffic loads. This gain increases as the traffic asymmetry increases, reaching up to 97% and 200% gains relative to random and fixed duplexing schemes respectively. Our results also show that the proposed algorithm is well-adapted to dynamic traffic conditions and different network sizes, and operates efficiently in case of severe cross-link interference in which neighboring cells transmit in opposite directions.

Original languageEnglish (US)
Title of host publication2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages939-944
Number of pages6
ISBN (Electronic)9781479958634
DOIs
StatePublished - Oct 21 2014
Event2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Barcelona, Spain
Duration: Aug 26 2014Aug 29 2014

Publication series

Name2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings

Other

Other2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014
CountrySpain
CityBarcelona
Period8/26/148/29/14

Keywords

  • Dynamic-TDD
  • reinforcement learning
  • self-organizing networks
  • small cells

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

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    Elbamby, M. S., Bennis, M., Saad, W., & Latva-Aho, M. (2014). Dynamic uplink-downlink optimization in TDD-based small cell networks. In 2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings (pp. 939-944). [6933488] (2014 11th International Symposium on Wireless Communications Systems, ISWCS 2014 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISWCS.2014.6933488