Cross-layer aware enhancement of VoIP mapping in wireless OFDMA systems

Itzik Kitroser, Yehuda Ben-Shimol

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

Abstract

This work addresses the problem of efficient broadcasting of resource allocations descriptors for VoIP traffic in mobile OFDMA-based wireless systems. We show that the mapping overhead is substantially reduced by using semi-persistent allocations and that by taking advantage of the periodicity of VoIP frames, generated by a multi-phase vocoder. To handle the impact of mobility on the characteristics of the wireless channel we utilize a cross-layer decision approach to track the channel conditions and predict the expected mobile user behavior such that the system may under-react to channel changes in some cases. We present mapping algorithms that implement these decisions and show by extensive simulations, that with these mapping algorithms the allocation overhead can be substantially reduced in OFDMA-based systems such as WiMAX and LTE, while retaining a low computational complexity (O(n2)).

Original languageEnglish
Title of host publication2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012
DOIs
StatePublished - 1 Dec 2012
Event2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012 - Eilat, Israel
Duration: 14 Nov 201217 Nov 2012

Publication series

Name2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012

Conference

Conference2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, IEEEI 2012
Country/TerritoryIsrael
CityEilat
Period14/11/1217/11/12

Keywords

  • 3.5G and 4G Technologies
  • Cross-layer design and optimization
  • Resource allocation
  • VoIP

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