Nokia Research Center

Abstract: In directed diffusion routing, the diffusion of exploratory message can lead to heavy traffic load periodically. The performance of data transmission may severely deteriorate at that moment. This paper proposes a gradient-based constrained diffusion algorithm. By analyzing the gradients of node's neighbors, the breadth and depth for diffusion can be conducted firstly. Then diffusion is performed in the optimal set of chosen forwarding nodes. The simulation results indicate that this algorithm can decrease both duration of diffusion and data transmission delay significantly. In addition, it achieves greatly energy savings compared to prior method. Finally, it is compatible with original algorithm without additional control overhead.