Timing and Synchronization with Propagation Delay Symmetry and Originated Slave Clock Frequency for Ubiquitous Computing

Abstract

Time and frequency alignment is critical for ensuring QoS for application such as voice, real-time video, wireless hand-off, and data over a converged access medium. To satisfy the accuracy of time synchronization, both adjusting Communication path asymmetry and ratio of frequency between the time-aware systems are important. Network Time Protocol (NTP) is not satisfies time-sensitive applications. IEEE 1588 Precision Time Protocol (PTP) and IEEE 802.1AS don’ t calculate the communication path asymmetry. We propose the Single-TimeSync frame for reducing the number of control frames, adjusting propagation delay asymmetry and ratio of frequency originated with slave time-aware station clock. We simulate with base model in OPNET.