System and method for performing clock synchronization of nodes connected via a wireless local area network
US7120092B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2002 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | Apr 7, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0655
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A clock synchronization method and apparatus is disclosed for use in a communication system including a plurality of wireless nodes communicatively coupled via a wireless network, each of the plurality of wireless nodes having a local time base, and one of the plurality of wireless nodes being designated as a master node having a master time base which serves as a master clock against which the local time bases are synchronized. The clock synchronization method includes the steps of periodically transmitting synchronization frames to the plurality of non-master nodes so as to adjust the slave clocks associated with the respective non-master nodes. The synchronization frames are distributed from the master node at near-periodic intervals and includes a cycle time value that corresponds to the end of the previously transmitted synchronization frame. The slave clocks (i.e., non-master nodes) receiving the synchronization frame determine the cycle time value at the point of reception of the synchronization frame and adjusts their clocks by calculating a difference value between the received cycle time and a previously saved local cycle time value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.