This reminds me about a bug in the original wpan implementation. Not sure if it is fixed in Iyappan patch as I am using ns-2.29.
In the method: bool CsmaCA802_15_4::canProceed(double wtime, bool afterCCA) The following declaration exists: UINT_16 t_bPeriods,t_CAP; For large BO/SO values, UINT_16 is insufficient. I replaced it with UINT_32 and many problems with large BO/SO values were resolved. I used to get poor delivery ratio but now it is reasonable. I have no idea whether this has anything to do with your problem, but you might want to give it a try. There is a good chance it does. Make sure you update the type casts related to these two variables in this method, too. - Ahmad On Thu, 22 Mar 2007 10:47:37 +0100 Stefano Busanelli <[EMAIL PROTECTED]> wrote: > > Hi all, > > I'm using ns-allinone-2.31 package, that includes 802.15.4 > implementation made by Zheng subsequently patched by Iyappan. > > If I set to 14 both Beacon Order (BO) and Superframe Order (SO) values > of a generic device (not coordinator), ns returns this error message: > > <!>[0.300000](node 1) unable to start as a device: active channel scan > failed - > > This happens using scss methods and independently from the values > assumed by others flags, like "assoPermit" or "isFFD". > > Instead if I set BO=14 and SO=13, all works well. > > Am i making some mistakes or the "legal" pair (BO=14,SO=14) is not > admitted in current implementation of 802.15.4? > > I'm looking forward to receive your prompt reply. > > Best regards > > Busanelli Stefano >
