Clock synchronization for wireless local area networks

Author

Mock, Michael ; Frings, Reiner ; Nett, Edgar ; Trikaliotis, Spiro

Author_Institution

German Nat. Res. Center for Comput. Sci., St. Augustin, Germany

fYear

2000

fDate

2000

Firstpage

183

Lastpage

189

Abstract

High-precision clock synchronization is one of the most basic requirements in distributed real-time systems. This paper presents an enhanced clock synchronization protocol for wireless local area networks based on the IEEE 802.11 standard. Reducing the time-critical path of the protocol enhances the synchronization precision. As wireless communication links are inherently unreliable, special emphasis is put on fault tolerance. The protocol guarantees high precision even in the presence of message losses. The protocol is implemented in a Windows NT NDIS driver for Lucent WaveLAN cards. For this driver-level implementation, our measurements have shown that a precision of 150 μs is achieved

Keywords

IEEE standards; clocks; fault tolerance; protocols; real-time systems; synchronisation; telecommunication links; wireless LAN; 150 mus; IEEE 802.11 standard; Lucent WaveLAN cards; Microsoft Windows NT NDIS driver; clock synchronization protocol; distributed real-time systems; driver-level implementation; embedded systems; fault tolerance; message losses; synchronization precision; time-critical path; wireless communication links; wireless local area networks; Access protocols; Clocks; Electronic mail; Electronic switching systems; Postal services; Synchronization; Wire; Wireless LAN; Wireless application protocol; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Real-Time Systems, 2000. Euromicro RTS 2000. 12th Euromicro Conference on

Conference_Location

Stockholm

ISSN

1068-3070

Print_ISBN

0-7695-0734-4

Type

conf

DOI

10.1109/EMRTS.2000.854006

Filename

854006