Patent ID: 9585113
Date: 2017-02-28
CPC Classifications: H04W

Claim:
1. A method for time synchronization between a network time of an ad hoc network which is configured by a plurality of time-synchronized nodes and a new node internal clock time, the method comprising: receiving, by a new node, a message including an address of one of the plurality of time-synchronized nodes which belong to the ad hoc network from the one of the plurality of time-synchronized nodes having a function of receiving a time-synchronization request frame and a function of transmitting a time-synchronization reply frame including time-synchronization information for synchronizing the new node internal clock time to a synchronized internal clock time of the one of the plurality of time-synchronized nodes; transmitting, by the new node, the time-synchronization request frame including, as a destination of the time-synchronization request frame, the address included in the message, after a specified transmission wait time has passed from a time when the message is received by the new node; receiving the time-synchronization reply frame including the time-synchronization information transmitted from the destination of the time-synchronization request frame in response to reception of the time-synchronization request frame transmitted by the new node; and performing, by the new node, time-synchronization between the new node internal clock time and the synchronized internal clock time of the one of the plurality of time-synchronized nodes using the time-synchronization information included in the time-synchronization reply frame received from the destination of the time-synchronization request frame.