Patent ID: 8681620

Claim:
A method of notifying about and avoiding congestion situation in data transmission using a mesh node existing in a route between multiple gateways (GWs) in a wireless mesh network, the method comprising: calculating the data congestion level based on the degree of data accumulated in the queues of a mesh node to be used for transmitting the data when a Route Announcement (RANN) message is received from the multiple GWs; comparing the route congestion level of the RANN message with the data congestion level; setting the data congestion level as the route congestion level of the RANN message when the data congestion level is greater than the route congestion level, and transmitting the RANN message where the route congestion level is newly set, to the mesh node and a subsequent mesh node in the same route as the mesh node; and transmitting divided queues obtained by dividing the queue, to transmission routes determined based on the route congestion level, when data transmission with respect to the queue is requested, wherein the transmitting comprises: dividing the multiple queues into divided queues; and differentially transmitting, based on the route congestion level of the RANN message, the divided queues to a transmission route of a primary GW and a transmission route of a secondary GW.