Patent ID: 8441620
Filing Date: 2013-05-14
Classification: H04L

Abstract:
1. A method for determining location of nodes, comprising: transmitting a pilot signal from a first node to a second node and a third node simultaneously, wherein a distance between the first node and the second node is determined by: transmitting an additional pilot signal from the second node to the third node and the first node simultaneously; in response to receiving the pilot signal at the second node, retransmitting the pilot signal from the second node to the first node and the third node simultaneously; in response to receiving the additional pilot signal at the third node, retransmitting the additional pilot signal from the third node to the first node and the second node simultaneously; measuring a roundtrip delay of the pilot signal at the first node and the second node; measuring a difference between arrival times of the pilot signals at the third node and the first node; and determining spatial information with respect to the first, second, and third nodes based at least on the determined distance, the measured roundtrip delays and the measured difference between arrival times of the pilot signal and the additional pilot signal.