I also have these questions. Please let me know the correct anwers too.
But I guess collisions do occur and simple CSMA protocol is followed.

Message: 8
Date: Thu, 4 Feb 2010 07:51:57 +0530
From: MALINI MANOHARAN <[email protected]>
Subject: [Tinyos-help] Reg base station
To: [email protected]
Message-ID:
       <[email protected]>
Content-Type: text/plain; charset="iso-8859-1"

Hi all,

       How does the base station receive the messages from all the sensor
nodes within its range without collision? Any registers involved in this to
store the data packets received?
       May be this question doesnt suit this mailing list. But someone who
knows the answer can help me with it. Plz help...I am confused with it.
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