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A great number of Internet of Things (IoT) and machine-to-machine (M2M) basedapplications require energy efficient, long range and low data rate wirelesscommunication links. In order to offer a competitive solution in these areas,IEEE 802.11 standardization group has defined the "ah" amendment, the firstsub-1GHz WLAN standard, with flexible channel bandwidths, starting from 1MHz,up to 16MHz, and many other physical and link layer improvements, enablinglong-range and energy efficient communications. However, for some regions, likeEurope, the maximum transmitted power in dedicated frequency band is limited toonly 10mW, thus disabling the achievement of ranges which would be close totargeted of up to 1km. In this paper we examine possibilities for rangeextension through implementation of half-duplex decode-and forward (DF) relaystation (RS) in communication between an access point (AP) and an end-station(ST). Assuming a Rician fading channel between AP and RS, and a Rayleigh fadingchannel on the RS-ST link, we analytically derive results on achievable rangesfor the most robust modulation and coding schemes (MCSs). Analyses areperformed for two different standard adopted deployment scenarios on the RS-STlink. Moreover, we have analyzed whether the considered most robust MCSs, knownfor supporting the longest range, but the lowest data rates, can meet thedefined requirement of at least 100kb/s for the greatest attainable AP-RS-STdistances. We examine data rate enhancements, brought by coding and using ofshort packets, for both downlink (DL) and uplink (UL). Finally, we present biterror rate (BER) results, obtained through simulations of a dual-hop DF IEEE802.11ah relay system for the considered MCs. All presented results confirmthat IEEE 802.11ah systems, through deployment of relay stations, become aninteresting solution for M2M and IoT based applications.

Range Extension in IEEE 802.11ah Systems Through Relaying