Link scheduling in sensor networks: distributed edge coloring revisited

— We consider the problem of link scheduling in a sensor network employing a TDMA MAC protocol. Our link scheduling algorithm involves two phases. In the first phase, we assign a color to each edge in the network such that no two edges incident on the same node are assigned the same color. We propose a distributed edge coloring algorithm that needs at most (δ+1) colors, where δ is the maximum degree of the graph. To the best of our knowledge, this is the first distributed algorithm that can edge color a graph with at most (δ +1) colors. In the second phase, we map each color to a unique timeslot and attempt to identify a direction of transmission along each edge such that the hidden terminal and the exposed terminal problems are avoided. Next, considering topologies for which a feasible solution does not exist, we obtain a direction of transmission for each edge using additional timeslots, if necessary. Finally, we show that reversing the direction of transmission along every ed...

• Type: Conference
• Year: 2005
• Where: INFOCOM
• Authors: Shashidhar Gandham, Milind Dawande, Ravi Prakash
• Keywords: Communications, Edge, INFOCOM 2005, Link Scheduling, TDMA MAC