Simulations of a chain of Telecom Boundary Clocks combined with Synchronous Ethernet for phase/time transfer

Abstract

This paper describes the use of Boundary Clocks for clock distribution (phase/time transfer) in telecom networks. The technology is primarily used to meet synchronization requirements of mobile systems such as TD-SCDMA and LTE, and to reduce the use of and dependency on GPS systems deployed in base stations. We describe the most important functions of a Telecom Boundary Clock, which are under discussion at ITU-T. We then present a network reference model and simulation model based on IEEE1588 and Synchronous Ethernet. The results indicate that it is possible to transfer phase/time in a telecom network for meeting the microsecond-level requirement of various mobile systems. The paper also discusses some of the ongoing activities in standardization bodies so that IEEE1588 can be used as a technology in telecom networks.