Depending on how to collect data and process them, we can distinguish the traditional Client/Server based data dissemination protocols, and the Mobile Agents protocols. In the traditional Client/Server architectures, data sources are transferred to a destination to be processed there, while in Mobile Agents architectures, a specific executable code passes through relevant sources to collect and process data. Mobile Agents can be used to significantly reduce the cost of communication, especially through low bandwidth, by moving the processing function to the data, rather that bringing the data to a central processor.
This work proposes to use a Client/Server approach using Mobile Agents to aggregate data in a planar architecture of wireless sensor network.

1 Facul t y of El ect roni c and Com put i ng D epart m ent , U ni versit y of Sci ences and Technol ogy H O U ARI BO U M ED IEN E (U STH B), BP 32 EL A LIA 16111 BAB EZZO U A R Al gi ers Al geri a 2 Facul t y of Econom i c, Com m erci al and M anagem ent Sci ences U ni versit y of Al gi ers 3. Al geri a Abstract. Recent l y, M obi l e A gent s have been used for effi cient dat a di ssem inat i on i n w i rel ess sensor net works. In t he t radi t i onal Cl i ent / Server archi t ect ures, dat a sources are t ransferred t o a dest i nat i on w hi l e i n M obi l e A gent s archi t ect ures, a speci fi c execut abl e code passes t hrough rel evant sources t o col l ect dat a. M obi l e A gent s can be used t o si gni fi cant l y reduce t he cost of com m uni cat i on, especi al l y t hrough l ow bandw i dt h, by m ovi ng the processing funct i on t o t he dat a, rat her t hat bri ngi ng t he dat a t o a cent ral processor. Thi s w ork proposes t o use a Cl i ent / Server approach usi ng M obi l e A gent s to aggregat e dat a i n a pl anar archi t ect ure of wi rel ess sensor net work. Keywords: W i rel ess Sensor N et works, Energy Savi ng, D at a D i ssem inat i on, D at a Aggregat i on, M obi l e Agent s.

Mobile Agents (MAs) are referred to as autonomous application programs with the inherent ability to move between nodes towards a goal completion. In the context of Wireless Sensor Networks (WSNs), MAs may be used in the process of combining data from different sources aiming at maximizing the useful information content. MAs have been initially developed to replace the Client/Server model which exhibits many disadvantages, particularly in WSN environments (e.g. heavy bandwidth usage and high energy consumption). Mobile Agents can be used to significantly reduce the cost of communication, especially through low bandwidth, by moving the processing function to the data rather than bring the data to a central processor. The main objective of this paper is to analyze some Client/Server and Mobile Agent data dissemination protocols in WSN.

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