IEEE 802.11ah Based M2M Networks Employing Virtual Grouping and Power Saving Methods

Kohei OGAWA  Masahiro MORIKURA  Koji YAMAMOTO  Tomoyuki SUGIHARA  

IEICE TRANSACTIONS on Communications   Vol.E96-B    No.12    pp.2976-2985
Publication Date: 2013/12/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.2976
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Network and System Technologies for Sustainable Society)
M2M networks,  wireless LAN,  IEEE 802.11ah,  EDCA,  power saving,  CSMA/CA,  

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As a promising wireless access standard for machine-to-machine (M2M) networks, the IEEE 802.11 task group ah has been discussing a new standard which is based on the wireless local area network (WLAN) standard. This new standard will support an enormous number of stations (STAs) such as 6,000 STAs. To mitigate degradation of the throughput and delay performance in WLANs that employ a carrier sense multiple access with collision avoidance (CSMA/CA) protocol, this paper proposes a virtual grouping method which exploits the random arbitration interframe space number scheme. This method complies with the CSMA/CA protocol, which employs distributed medium access control. Moreover, power saving is another important issue for M2M networks, where most STAs are operated by primary or secondary batteries. This paper proposes a new power saving method for the IEEE 802.11ah based M2M network employing the proposed virtual grouping method. With the proposed virtual grouping and power saving methods, the STAs can save their power by as much as 90% and maintain good throughput and delay performance.