What are the factors required to be considered for wsn using on-demand query based apporach ??

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Hadi Shakibian

Hi Noura,

Maybe you need a model of energy consumption for sensor nodes. See these papers:

1- An Application Specific Protocol Architecture for Wireless Microsensor Networks

2- A particle swarm optimization based method for multi-objective design optimizations

Using such a model, you can report the energy consumption of each sensor node or calculate the network lifetime.

Reema Ahmad

I think that the most common factor related to WSN that is using query-based approach is: the time factor (i.e. the node has a lifetime of a certain number of hops after which it dies.'

A node will not generate a query unless it learns a route to the required event. If there

is no route available, the node transmit a query in a random direction.

Then, node waits to know if the query reached the destination for a certain amount of time, after which the node floods the network if no response is heared from the destination.

Noura Al-Hoqani

Dear Hadi and Reema

Thank you very much for the answer.

Can I also ask for the best scenario for running single query to a sensor networks consider he time factor, How do I measure the energy consumed and the life time of the sensor nodes. ?

you can measure the energy by probabilistic flooding where each node rebroadcasts

queries with a fixed probability p. Parameter p allows to fine-tune the tradeoff

between energy spent for query dissemination and the number of nodes

reached. Moreover, in most (densely connected)sensor networks there exists a p0 < 1 such that all nodes are reached by the base station. Thus, if the rebroadcast probability p is larger than p0 ,

more queries are forwarded than necessary, and the query dissemination can

save energy by using p0. On the other hand, if p

Thank you very much for the explanation, I appreciate if you recommend any paper, that explain more on query dissemination. I think that is related to the point I am researching on.

best wishes