I would like to express my sincere gratitude and appreciation to: My supervisor, Prof.K. Djouani and co-supervisor, Mr. A. Kurien, for their advice, commitment, stimulating suggestions and guidance. I am especially indebted to Mr. G. Noel, Prof. Y. Hamam, Prof. G. Qi and Prof. M. Mzyece, and my colleagues at F'SATI and all those who supported and encouraged me throughout the course of the study. More information can also be found in 1]L. Miao, K.Djouani, A. Kurien, and G. Noel, "A competing algorithm for gradient based routing in wireless sensor networks," in WINSYS 2010, 26th-28th July...