Table 2: Description of experimental classes and parameters presented in Table 1.

Name Description Horizontal Source and destination at the opposite ends on the same floor. Only the motes on the same floor were used for this class of experiments (e.g., node-pair ). Diagonal Source and destination on different floors and on the opposite ends. All the motes in MoteLab were used (e.g., ). Vertical Source and destination on different floors but on the same end. All the motes in MoteLab were used (e.g., ). Nearby Source and destination are nearby to each other but surrounded by a high density of nodes. Only 30 to 50 neighboring motes were used (e.g., ). Intermediate links The percentage of links in the network with average PRR less than 90%. Forwarders The percentage of the overhearing-nodes in the network that can overhear a data packet and have a lower path-ETX than the path-ETX of the parent of the sender. Candidates The percentage of the overhearing-nodes in the network that can overhear three consecutive data packets and have a lower path-ETX than the path-ETX of the parent of the sender. Node density Number of neighbors that can overhear a node’s data packet. Potential neighbors Number of neighbors that can overhear a node’s data packet and have a lower path-ETX than the path-ETX of its parent. Candidate neighbors Number of neighbors that can overhear three consecutive data packets from a node and have a lower path-ETX than the path-ETX of its parent.