SVivaldi.cc

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00001 // Copyright (C) 2009 Institut fuer Telematik, Universitaet Karlsruhe (TH)
00002 //
00003 // This program is free software; you can redistribute it and/or
00004 // modify it under the terms of the GNU General Public License
00005 // as published by the Free Software Foundation; either version 2
00006 // of the License, or (at your option) any later version.
00007 //
00008 // This program is distributed in the hope that it will be useful,
00009 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00010 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00011 // GNU General Public License for more details.
00012 //
00013 // You should have received a copy of the GNU General Public License
00014 // along with this program; if not, write to the Free Software
00015 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00016 //
00017 
00024 #include <cfloat>
00025 
00026 #include <NeighborCache.h>
00027 
00028 #include "SVivaldi.h"
00029 
00030 
00031 void SVivaldi::init(NeighborCache* neighborCache)
00032 {
00033     Vivaldi::init(neighborCache);
00034 
00035     lossC = neighborCache->par("vivaldiLossConst");
00036     lossResetLimit =  neighborCache->par("lossResetLimit");
00037 
00038     loss = 0;
00039     WATCH(loss);
00040 }
00041 
00042 
00043 double SVivaldi::calcError(const simtime_t& rtt, double dist, double weight)
00044 {
00045     // get avg absolute prediction error
00046     double sum = neighborCache->getAvgAbsPredictionError();
00047 
00048     // update weighted moving average of local error
00049     return (sum * errorC) + ownCoords->getError() * (1 - errorC);
00050 }
00051 
00052 
00053 double SVivaldi::calcDelta(const simtime_t& rtt, double dist, double weight)
00054 {
00055     // calculate loss factor
00056     loss = lossC + (1 - lossC) * loss;
00057     if(fabs(dist - SIMTIME_DBL(rtt)) > lossResetLimit) loss = 0.0;
00058 
00059     return coordC * weight * (1 - loss);
00060 }
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