Patent ID: 9544018
Date: 2017-01-10
CPC Classifications: H02J,H04B,H04L,Y02E,Y04S

Claim:
1. A method, comprising: in a low power and lossy network (LLN) comprising one or more interfaces and a plurality of nodes, determining, by a first node, data comprising an absolute phase value of a power on a power line associated with the first node; transmitting to a second node and a third node, by the first node, data indicating a time corresponding to a last zero crossing of the power supplied to the first node; receiving, by the second node, data from the first node comprising data indicating the time corresponding to the last zero crossing of the power supplied to the first node; determining, by the second node, a time since a last zero crossing of the power supplied to the second node; calculating, by the second node, a differential phase value between the first node and the second node based on the difference between the last zero crossings of the power supplied to the first node and the power supplied to the second node; transmitting, by the second node to the first node, the calculated differential phase value between the first node and the second node; receiving, by the first node from the second node, the calculated differential phase value between the first node and the second node; receiving, by the first node, a calculated differential phase value between the second node and the third node; and determining, by the first node, an absolute phase value of the second node and an absolute phase value of the third node relative to the phase value of the first node based on the received differential phase values of the second node and the third node and the absolute phase value of the first node.