#include <ErrAndCollDecider.h>
Inheritance diagram for ErrAndCollDecider:
This decider simply takes a look at the sduList contained in the received PhySDU packet and checks whether one of the mentioned snr levels is lower than the snrThresholdLevel which has to be read in at the beginning of a simulation (suggestion: from the omnetpp.ini file!). If there is such a level the packet is considered to be lost due to a collision. On top of that the packet can also be lost due to the BAD state of the digital channel model model (see e.g. GilbertElliotSnr module). This module should be used in combination with digital channel modules like GilbertElliotSnr.
Protected Member Functions | |
virtual void | handleLowerMsg (AirFrame *, SnrList &) |
In this function the decision whether a frame is received correctly or not is made. |
void ErrAndCollDecider::handleLowerMsg | ( | AirFrame * | af, | |
SnrList & | receivedList | |||
) | [protected, virtual] |
In this function the decision whether a frame is received correctly or not is made.
Redefine this function if you want to process messages from the channel before they are forwarded to upper layers
In this function it has to be decided whether this message got lost or not. This can be done with a simple SNR threshold or with transformations of SNR into bit error probabilities...
If you want to forward the message to upper layers please use sendUp which will decapsulate the MAC frame before sending
Reimplemented from SnrDecider.
00028 { 00029 if (snrOverThreshold(receivedList)) 00030 { 00031 if (af->hasBitError()) 00032 { 00033 EV << "Message got lost due to digital channel model BAD state\n"; 00034 delete af; 00035 } 00036 else 00037 { 00038 EV << "Message handed on to Mac\n"; 00039 sendUp(af); 00040 } 00041 } 00042 else 00043 { 00044 EV << "COLLISION!\n"; 00045 delete af; 00046 } 00047 }