Patent ID: 9479952
Filing Date: 2016-10-25
CPC Classification: G01S,H04W

Claim Text:
1. A method for communication between two nodes of a radio network, the method comprising: transmitting, by the first node and to a second node, a first signal at a first frequency, the first signal transmitted during a first time window and having a measurable first phase value; receiving, by the first node, a second signal from the second node, the second signal received at a second frequency, the second signal received during the first time window and having a measurable second phase value; transmitting, by the first node and to the second node, a third signal at a third frequency that is different from the first frequency by a frequency difference, the third signal transmitted during a second time window and having a measurable third phase value; receiving, by the first node, a fourth signal from the second node, the fourth signal received at a fourth frequency that is different from the second frequency by the frequency difference, the fourth signal received during the second time window and having a measurable fourth phase value; and based on the first phase value, the second phase value, the third phase value, and the fourth phase value and the frequency difference, determining the distance between the first node and the second node.