Patent ID: 9198203
Filing Date: 2015-11-24
Classification: H04L,H04W,Y02D

Abstract:
1. A method of transmitting a message in a Low-power and Lossy Network (LLN), the method comprising: receiving, on a first node in the LLN, a message from a sending node; determining if the message has already been received by the first node previously; identifying the received message as a critical message; in response to both identifying the message as a critical message and to determining that the message has not been received by the first node previously, identifying a first parent and a second parent of the first node to which the message is to be transmitted; transmitting the message with a critical message indication from the first node to the identified first parent node; receiving a negative acknowledgment message from the first parent node indicating that the message with the critical message indication has been received by the first parent node previously; in response to receiving the negative acknowledgment message from the first parent node, transmitting the message with the critical message indication to the second parent node; receiving a negative acknowledgment message from the second parent node indicating that the message with the critical message indication has been received by the second parent node previously; in response to receiving the negative acknowledgment message from the second parent node, transmitting the message with the critical message indication to a third parent node, wherein a path of transmission of the message through the LLN is not identified before the message is transmitted through the LLN, and wherein an order of nodes used for transmission of the message through the LLN is determined dynamically as the message moves through the LLN; receiving a negative acknowledge message from two or more siblings indicating that an uplink path is experiencing adverse performance; in response to receiving the negative acknowledge message from two or more siblings: