I found them, The parent selection procedure is repeated periodically (7) (7) In the TinyOS 2:1 implementation of CTP, the length of this period is set to 8 seconds (see also the BEACON_INTERVAL parameter in /tos/lib/net/ctp/TreeRouting.h).
Broadcast intervall of the probe is between Iminb and Imaxb, specified when the CtpRoutingEngine module is initialized6. (6)In the TinyOS 2:1 implementation of CTP, this is done at line 134 of the file /tos/lib/net/ctp/CtpP.nc References: [The Collection Tree Protocol for the Castalia Wireless Sensor Networks Simulator, Ugo Colesanti, Silvia Santini, ETH Zurich] 2013/7/22 Sarra Sarah <[email protected]> > Hi, > Refering to this description part of ETX metric used by CTP protocol. > > "Each node broadcasts a probe packet every* second* including in its > probes the number of probes received from each neighboring node over the > last w seconds (*w=**10s* * *in their implementation). " > > [ > http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.144.9531&rep=rep1&type=pdf > ] > > I ask if anyone know how to change the two underlined period in Tinyos > code.( intervall of time to send broadcast probe and the intervall of time > (w) to calculate and changing the value of ETX. > > I need it so much. Thank you for help >
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