Abstract:

Single channel wireless sensor networks are known to be unreliable when the channel of choice is severely interfered. They also suffer from the low throughput problem when the network scale is large. While using multiple channels is a promising technique to solve these problems, the existing singlechannel based routing protocols are not readily applicable for multichannel scenarios due to the challenges brought forward by multichannel transmissions. In this paper, a tree routing protocol is proposed for multichannel WSNs based on the following ideas: First, beacon interval is adaptive to network topology; Second, link quality is estimated by the measure of beacondriven and datadriven Extra Expected Number of Transmission(EETX); Finally, the neighbor table insertion and removal process is synchronized across the MAC layer and routing layer to reduce the communication and power consumption overhead. This protocol is implemented on our testbed and the experimental results show that this protocol provides a fast convergence rate, a stable topology, and reliable data transmissions.

Key words: multichannel;crosslayer;collecting tree;routing protocol;adaptive;eetx