Method for time synchronization in a communications network

US9288037B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Dragan Obradovic · Ottobrunn, DE
• Ruxandra Scheiterer · Geretsried, DE
• Philipp Wolfrum · Munich, DE
• Günter Steindl · Poppenricht, DE

Key dates

• Filing date: Sep 1, 2011
• Grant date: Mar 15, 2016
• Expiry date: Oct 23, 2031

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04J3/0667
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method for time synchronization in a communications network having multiple nodes, wherein the nodes comprise a first node and at least one second node, where the first node generates first cycle counter states according to a reference clock frequency and the second node or nodes each generate second cycle counter states according to an internal clock frequency, where a time synchronization is carried out in sequential synchronization cycles, in which synchronization messages originating from the first node are sequentially transmitted from one node to another node, and a synchronization message transmitted by a node contains information used for time synchronization in the at least one second node receiving the synchronization message such that a time synchronization is performed in a given second node based on an estimation of a first cycle counter state and a compensation factor in combination with a linear quadratic regulator.