Hi, this interval is related with the CCA and backoff process. 2013/2/4 Farzad Samie <[email protected]>
> Hi Christian > Perfect! It works now. And it will not go to receive more after > transmission. > But there is still a question; According to the signal value in image > below, it sounds that the sender will listen to the channel to check > whether it is free or not. It senses career first, and then send the > packets. Is it the reason of this signal's behavior? If yes, can we > reduce the time interval of listening to channel before transmission? > https://www.dropbox.com/s/9bwa4quu68z7561/wave2.bmp > > Thanks again > Farzad > > > On 04.02.2013 15:41, Christian Haas wrote: > > On 02/04/2013 03:05 PM, Farzad Samie wrote: > >> Hello > >> I'm trying to measure the radio module power (in send/receive state). My > >> platform is telosb (tinyos2.x and radio module is cc2420). I use low > >> power listening interface. > >> > >> I have two nodes: The first one is just a sender; it should only send > >> packet and doesn't need to receive any thing. > >> > >> I've set the transmission power to lowest level on sender, transmit 2 > >> packets per second periodically. So according to datasheet, I expect it > >> to consume about 9mA for a short period and then goes to sleep mode and > >> consumes about a few uA. But after sending these 2 packets, it spends > >> more time (~100ms) in receive mode (consuming about 20mA). > > > > 100ms is the default delay after receive parameter as defined in Lpl.h, > > so this is just the way LPL works. You can change the value to 0 for > > both nodes, but be careful within bigger networks where a higher delay > > after receive value might improve the overall network performance. > > > > Regards, > > Christian > > > > > > > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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