[Tinyos-help] about 802.15.4 ack

[6lowpan]

Hi everyone.

In 802.15.4,when a receiver receives a frame from a sender ,it will send
back an ack.If the sender fails to receiver the ack,it will send the frame
with the same sequence number again.

I can not find how the receiver handles this frame in the document.Does it
discard it or process it once more?thanks and sorry for my bad English. 

 

 

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