Misc
Pitfalls
- Use Java 1.4 compatibility, BCel cannot handle Java 5.0
- If more than one node use the same NetAddress, the simulation aborts prematurely without any error message.
- All entity classes and related interfaces MUST be public.
- The JUnit test runner is always restarted. Workaround: Write your own test runner using the pattern "setup - test - teardown".
Interesting Things
computeAvgConnectivity
Collisions
- RadioNoiseIndep and RadioSimpleStochastic both do not implement packet collisions on radio level:
RadioNoiseIndep.receive():
case Constants.RADIO_MODE_RECEIVING:
if(Main.ASSERT) Util.assertion(signals>0);
if(power_mW >= radioInfo.shared.threshold_mW
&& power_mW > signalPower_mW*thresholdSNR)
{
lockSignal(msg, power_mW, duration);
}
break;
- RadioNoiseAdditive implements additive superposition of radio signals and packet collisions. A signal is received only if it is stronger than thresholdSNR multiplied with the sum of the power of all other signals. Otherwise all signals are scrambled.
RadioNoiseAdditive.receive():
case Constants.RADIO_MODE_RECEIVING:
if(power_mW > signalPower_mW && power_mW >= totalPower_mW*thresholdSNR)
{
lockSignal(msg, power_mW, duration);
setMode(Constants.RADIO_MODE_RECEIVING);
}
else if(type == SNR
&& signalPower_mW < (totalPower_mW-signalPower_mW+power_mW)*thresholdSNR)
{
unlockSignal();
setMode(Constants.RADIO_MODE_SENSING);
}
break;
Multi-Channel Support for JiST
Architecture
RadioIf <|--- ChannelIf ---|> FieldIf
NetworkIf
|
MacIf <|-- Mac802_11 <|-- MacMc802_11
| |
RadioIf |
| |
ChannelIf <|------------- Channel
|
FieldIf
- Channels are realized through an additional channel layer
- Has an active channel within a given set of channels
- Discards packets on other channels
- Delayed channel switching (only possible, when not transmitting)
- TODO Cross-channel interference
Further Information