Analysis of Offset Estimation Method for Network Timing

• 1、Beijing Key Laboratory of System Architecture and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications

Abstract：Precise Time Protocol (PTP) is one of the current mainstream network timing protocols, and the timing accuracy can reach sub-microsecond level. PTP performs network timing based on the assumption that the two-way data packet delay is equal, but the asymmetry of the actual network two-way delay will seriously affect the timing performance of PTP. The time offset estimation method is used to compensate for the influence of asymmetric delay, and has the advantages of flexible application and no hardware support. This article investigates and analyzes the time offset estimation method. For the phase offset estimation (POE) method and the traditional offset estimation method, mathematical models are given and simulation experiments are carried out in various scenarios such as cross background flow, parallel background flow and different loads. The results show that the phase offset estimation method K model has better performance.

Keywords： network timing time compensation precise time protocol