Title :
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
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;
Conference_Titel :
Real-Time Systems, 2000. Euromicro RTS 2000. 12th Euromicro Conference on
Conference_Location :
Stockholm
Print_ISBN :
0-7695-0734-4
DOI :
10.1109/EMRTS.2000.854006
