Hi I have some question related to CC2420.
My environment: Tinyos-1.x + Imote2 For CC2420, there is a initial backoff period before sending packets. The default value is (random()&0xF +1)*320us= [320us, 3.84ms]. When I use the default value, the packet loss rate is low, which is near 2%. If I decrease the value to (random()&0x7 +1) or a smaller value, the packet loss rate increases significantly to 20~50%. The RF power is 31. Only one node is sending packets, thus there are should not have intense transmission collision. Inside a node, there is continuing data stream from upper layer to radio. So after a packet is sent, another one will continue immediately. Can someone tell me why the initialbackoff has such a big impact on packet loss rate. Before I thought the purpose for intialbackoff is to reduce collision. Now It seems not. Is such a long period(more than 2ms) used for the transistion from RX->TX? But it should not take such a long time -- Renjie Huang Sensorweb Research Laboratory http://sensorweb.vancouver.wsu.edu/ Washington State University
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