An SMDP approach to optimal PHY configuration in wireless networks

Mark Shifrin, Daniel S. Menasche, Asaf Cohen, Omer Gurewitz, Dennis Goeckel

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this work, we study the optimal configuration of the physical layer in wireless networks by means of Semi-Markov Decision Process (SMDP) modeling. In particular, assume the physical layer is characterized by a set of potential operating points, with each point corresponding to a rate and reliability pair; for example, these pairs might be obtained through a now-standard diversity-vs-multiplexing tradeoff characterization. Given the current network state (e.g., buffer occupancies), a Decision Maker (DM) needs to dynamically decide which operating point to use. The SMDP problem formulation allows us to choose from these pairs an optimal selection, which is expressed by a decision rule as a function of the number of awaiting packets in the source's finite queue, channel state, size of the packet to be transmitted. We derive a general solution which covers various model configurations, including packet size distributions and varying channels. For the specific case of exponential transmission time, we analytically prove the optimal policy has a threshold structure. Numerical results validate this finding, as well as depict muti-threshold policies for time varying channels such as the Gilber-Elliot channel.

Original languageEnglish
Title of host publication2017 13th Annual Conference on Wireless On-Demand Network Systems and Services, WONS 2017 - Proceedings
EditorsTommaso Melodia, Klaus Wehrle, Marios Lestas, Konstantinos Psounis
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages128-135
Number of pages8
ISBN (Electronic)9783901882883
DOIs
StatePublished - 28 Mar 2017
Event13th Annual Conference on Wireless On-Demand Network Systems and Services, WONS 2017 - Jackson Hole, United States
Duration: 21 Feb 201724 Feb 2017

Publication series

Name2017 13th Annual Conference on Wireless On-Demand Network Systems and Services, WONS 2017 - Proceedings

Conference

Conference13th Annual Conference on Wireless On-Demand Network Systems and Services, WONS 2017
Country/TerritoryUnited States
CityJackson Hole
Period21/02/1724/02/17

ASJC Scopus subject areas

  • Hardware and Architecture
  • Computer Networks and Communications

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