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H.: Self-organizing dynamic fractional frequency reuse in ofdma systems
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| Venue: | In: Proceeding of INFOCOM’2008 (2008 |
| Citations: | 83 - 3 self |
BibTeX
@INPROCEEDINGS{Stolyar_h.:self-organizing,
author = {Alexander L. Stolyar and Harish Viswanathan},
title = {H.: Self-organizing dynamic fractional frequency reuse in ofdma systems},
booktitle = {In: Proceeding of INFOCOM’2008 (2008},
year = {}
}
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Abstract
Abstract—Self-optimization of the network, for the purposes of improving overall capacity and/or cell edge data rates, is an important objective for next generation cellular systems. We propose algorithms that automatically create efficient, soft fractional frequency reuse (FFR) patterns for enhancing performance of orthogonal frequency division multiple access (OFDMA) based cellular systems for forward link best effort traffic. The Multisector Gradient (MGR) algorithm adjusts the transmit powers of the different sub-bands by systematically pursuing maximization of the overall network utility. We show that the maximization can be done by sectors operating in a semi-autonomous way, with only some gradient information exchanged periodically by neighboring sectors. The Sector Autonomous (SA) algorithm adjusts its transmit powers in each sub-band independently in each sector using a non-trivial heuristic to achieve outof-cell interference mitigation. This algorithm is completely autonomous and requires no exchange of information between sectors. Through extensive simulations, we demonstrate that both algorithms provide substantial performance improvements. In particular, they can improve the cell edge data throughputs significantly, by up to 66 % in some cases for the MGR, while maintaining the overall sector throughput at the same level as that achieved by the traditional approach. The simulations also show that both algorithms lead the system to ”self-organize ” into efficient, soft FFR patterns with no a priori frequency planning. I.
Keyphrases
self-organizing dynamic fractional frequency reuse ofdma system transmit power orthogonal frequency division multiple access different sub-bands outof-cell interference mitigation soft ffr pattern abstract self-optimization overall network utility multisector gradient important objective soft fractional frequency reuse extensive simulation cellular system effort traffic next generation cellular system non-trivial heuristic semi-autonomous way substantial performance improvement overall capacity overall sector throughput priori frequency planning sector autonomous cell edge data throughput cell edge data rate traditional approach gradient information
