An energy efficiency perspective on rate adaptation for 802.11n NIC

Chi-Yu Li, Chunyi Peng, Peng Cheng, Songwu Lu, Xinbing Wang, Fengyuan Ren, Tao Wang

Research output: Contribution to journalReview article

6 Scopus citations

Abstract

Rate adaptation (RA) has been traditionally used to achieve high goodput. In this work, we design RA for 802.11n NICs from an energy-efficiency perspective. We show that current MIMO RA algorithms are not energy efficient for NICs despite ensuring high throughput. The fundamental problem is that, the high-throughput setting is not equivalent to the energy-efficient one. Marginal throughput gain may be realized at high energy cost. We then propose EERA and EERA+, two energy-based RA schemes that trade off goodput for energy savings at NICs. EERA applies multidimensional ternary search and simultaneous pruning to speed up its runtime convergence in single-client operations, and uses fair airtime sharing to handle multiple-client operations. EERA+ further searches for multiple, staged rates to yield more energy savings over EERA. Our experiments have confirmed their effectiveness in various scenarios.

Original languageEnglish
Article number7173011
Pages (from-to)1333-1347
Number of pages15
JournalIEEE Transactions on Mobile Computing
Volume15
Issue number6
DOIs
StatePublished - 1 Jun 2016

Keywords

  • Energy efficiency
  • IEEE 802.11n standard
  • Multiple-input multiple-output (MIMO)
  • Rate adaptation

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    Li, C-Y., Peng, C., Cheng, P., Lu, S., Wang, X., Ren, F., & Wang, T. (2016). An energy efficiency perspective on rate adaptation for 802.11n NIC. IEEE Transactions on Mobile Computing, 15(6), 1333-1347. [7173011]. https://doi.org/10.1109/TMC.2015.2462814