Patent ID: 8189577
Filing Date: 2012-05-29
Classification: H04L,H04W,Y02D

Abstract:
1. A method of time synchronization in a network, comprising: requesting, by a requesting node, a current time value from a gateway as maintained by the gateway by sending a request from the requesting node to the gateway inserted in a data-link interface TLV (type-length-value); responding, by the gateway to the node, with a response packet comprising a value corresponding to the current time value maintained by the gateway; at each hop from the gateway to the node, adding a value corresponding to a transmission delay to the response packet at that hop; receiving, by the requesting node, the response packet; and based on the current time value and the added values in the response packet received by the requesting node, determining, by the requesting node, a current time value to be maintained by the requesting node and corresponding to the current time value maintained by the gateway.