Hi, With LPL you can do a simple calculation to calculate a worst case packet delivery time.If sleep interval is 1000 ms then in worst case every hop transmission will take ~1000ms. Now as hop number of hop increase this delay grows significantly. This explains the huge delay.
Also you said about lost packets. This is due to timeout issues. While using LPL with any other upper level protocol the time out and delay of both layers should be tuned according to each other. Regards Ravi --- Philip Levis <[EMAIL PROTECTED]> wrote: > On Aug 23, 2007, at 10:46 AM, Christian Hermann > wrote: > > > Hallo, > > I'm using dissemination to send commands to the > nodes > > and LQI collection to collect the data. All works > fine without LPL > > (beside the fact that dissemination is a lot > slower than collection > > with increasing node depth). But if I set LPL duty > cycle to 1000 > > for example, commands need very long (several > seconds) to reach its > > destination or even get lost completely quite > often. Collection > > becomes > > a little slower, but still delivers data reliably > with around 100ms > > total delivery time at node depth 2 or 3. > > (PS: I also activated PACKET_LINK layer) > > > > Does anyone know about issues with dissemination > vs. LPL? > > The TinyOS dissemination layer is inherently slower > than collection, > as it provides reliability and minimizes > transmissions on top of > local broadcasts using network trickles[1]. > > Phil > > [1] Philip Levis, Neil Patel, David Culler, and > Scott Shenker. > "Trickle: An Algorithm for Code Propagation and > Maintenance in > Wireless Sensor Networks." NSDI 2004. > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@Millennium.Berkeley.EDU > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > ____________________________________________________________________________________ Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!'s user panel and lay it on us. http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 _______________________________________________ Tinyos-help mailing list Tinyos-help@Millennium.Berkeley.EDU https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
