[android-developers] Wifi Power consumption optimisation

I want to write an application which will gather data from user and send them to router using wifi for example once in every minute (there will not be plenty of data rather <1kb in every minute but it is critical to send them quite frequently). My question is: How to optimize wifi usage? Should I switch it on and off every time when I'm using it? Or is there some sleeping mode (when wifi is switched off but after switching on it connect to network immediately without searching for ip etc.)   

Does it depend on android version? Is Android 2.2 ok, or do i need higher version (which one?)

Thank you in advance.

 Adam

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