NDLI: On clock synchronization over wireless LAN using timing advertisement mechanism and TSF timers

Content Provider	IEEE Xplore Digital Library
Author	Mahmood, A. Exel, R. Bigler, T.
Copyright Year	2014
Description	Author affiliation: Center for Integrated Sensor Syst., Danube Univ. Krems, Krems, Austria (Mahmood, A.; Exel, R.; Bigler, T.)
Abstract	The most recent version of the IEEE 802.11 standard, 802.11-2012 has extended the means of clock synchronization for wireless LANs. One of the mechanisms in the standard is called timing advertisement (TA). It involves calculating and maintaining the time offset with respect to the timing synchronization function (TSF) timer of the access point (AP). In the wireless stations, the TSF-based synchronization mechanism and the offset is combined to establish synchronization to an external timebase. However, such a method provides only loose synchronization unless the skew estimate between the external time source and the TSF timer of the AP is also conveyed to the nodes in the network, for which the standard provides no support. This study, in turn, provides another method, which is called SyncTSF, in which the external clocks at the AP and the nodes are synchronized to their respective TSF timers. Through analysis and measurements, it is shown that both SyncTSF and TA-based synchronization are limited by the frequency skews between the TSF timers of the AP and the nodes. Hence, for these methods to offer good synchronization accuracy, a mechanism to distribute frequency skews from the AP to the nodes should be provided.
Sponsorship	IEEE Instrum. Meas. Soc.
Starting Page	42
Ending Page	46
File Size	796731
Page Count	5
File Format	PDF
e-ISBN	9781479926992
DOI	10.1109/ISPCS.2014.6948529
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-22
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless communication Wireless LAN IEEE 802.11 Standards clock synchronization offset and rate adjustment timing synchronization function Software WLAN Synchronization IEEE802.11
Content Type	Text
Resource Type	Article

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