Hi Nagarajan,

I guess I didn't specify exactly the structure of the packages. As I told ONE package holds all the information that is needed from the transmitter. That means one package contains the ID of the transmitter and some data. If another package is sent it contains another data BUT IT HAS NO CONNECTION to the previous package. It's simpple a new information.
That means if only one package is received from one transmitter, it is enough to evaluate the data. The size of the evaluation data is only some bits.

The reason for using so small packages is the energy issue. As I wrote this is an ultra-low power application. Some transmitter has energy to send only 3x4 bytes. Another transmitter has power for sending more bytes.
And the idea behind the repetition of the packages is that the transmitter doesn't have enough energy to execute "listen than talk" functionality. The repetition should avoid the collision with other transmitters.

thanks for responses,

greetings

Attila