Lab measure on a coordinator and a sensor exchanging data in Non Beacon Enable mode. Check the randomness of the access to the channel by varying BE min . Evaluate the throughput by varying the payload of the packets transmitted.

1. 05.12.12 Daniele Antonioli 606082 1
Wireless Sensor Networks
Lab Work #3
MAC Protocol
Point to point
Non Beacon Enable Network

2. 05.12.12 Daniele Antonioli 606082 2
Outline
● Check the randomness of the access to the
channel by varying BEmin
● Evaluate the throughput by varying the Payload
of the packets transmitted

3. 05.12.12 Daniele Antonioli 606082 3
Non Beacon Enable Network

4. 05.12.12 Daniele Antonioli 606082 4
Non Beacon Enable Network
Unslotted CSMA/CA Protocol

5. 05.12.12 Daniele Antonioli 606082 5
Theoretical Results
Bemin ; Average Delay
Payload ; #ReTx ; Plost

6. 05.12.12 Daniele Antonioli 606082 6
Experiment

7. 05.12.12 Daniele Antonioli 606082 7
How to transmit 50 consecutive
packets
case stateDataTx:
App_Tx();
if (count<50)
{count++;
gState = stateDataTx;
}
else
gState = stateListen;
// TS_SendEvent(gAppTaskID_c, gAppEvtDummyEvent_c);
break;

8. 05.12.12 Daniele Antonioli 606082 8
How to change the Payload
static void App_Tx(void)
{
if( (mcPendingPackets < mDefaultValueOfMaxPendingDataPackets_c) && (mpPacket == NULL) )
...................................................
mpPacket->msgData.dataReq.pMsdu = "oooo";
mpPacket->msgType = gMcpsDataReq_c;
/* Create the header using coordinator information gained during
the scan procedure. Also use the short address we were assigned
by the coordinator during association. */
FLib_MemCpy(mpPacket->msgData.dataReq.dstAddr, mCoordInfo.coordAddress, 8);
FLib_MemCpy(mpPacket->msgData.dataReq.srcAddr, maMyAddress, 8);
FLib_MemCpy(mpPacket->msgData.dataReq.dstPanId, mCoordInfo.coordPanId, 2);
FLib_MemCpy(mpPacket->msgData.dataReq.srcPanId, mCoordInfo.coordPanId, 2);
mpPacket->msgData.dataReq.dstAddrMode = mCoordInfo.coordAddrMode;
mpPacket->msgData.dataReq.srcAddrMode = mAddrMode;
mpPacket->msgData.dataReq.msduLength = 4;
......................
}
}

9. 05.12.12 Daniele Antonioli 606082 9
How to change MAC parameter
BEmin
case stateSetParam:
UartUtil_Print("Setto BEmin", gAllowToBlock_d);
uint8_t param1[1];
*param1=0;
App_SetMacPib_Example(gMPibMinBe_c,param1);
uint8_t param[1];
mlmeMessage_t mlmeGet;
mlmeGet.msgType=gMlmeGetReq_c;
mlmeGet.msgData.getReq.pibAttribute=gMPibMinBe_c;
mlmeGet.msgData.getReq.pibAttributeValue=param;
MSG_Send(NWK_MLME, &mlmeGet);
UartUtil_Print("Getto BEmin", gAllowToBlock_d);
UartUtil_PrintHex(param, 1, 0);
gState=stateDataTx;
TS_SendEvent(gAppTaskID_c,gAppEvtDummyEvent_c);
break;

10. 05.12.12 Daniele Antonioli 606082 10
How to change MAC parameter
BEmin
uint8_t App_SetMacPib_Example(uint8_t attribute, uint8_t
*pValue)
{
mlmeMessage_t mlmeSet;
/* Create and execute the Set request */
mlmeSet.msgType = gMlmeSetReq_c;
mlmeSet.msgData.setReq.pibAttribute = attribute;
mlmeSet.msgData.setReq.pibAttributeValue = pValue;
return MSG_Send(NWK_MLME, &mlmeSet);
}

11. 05.12.12 Daniele Antonioli 606082 11
How to verify BEmin's change

12. 05.12.12 Daniele Antonioli 606082 12
How to verify BEmin's change

13. 05.12.12 Daniele Antonioli 606082 13
Measured Results
● Delays Statistics
● Throughput Statistics

14. 05.12.12 Daniele Antonioli 606082 14
Delays Statistics

15. 05.12.12 Daniele Antonioli 606082 15
Delays Statistics

16. 05.12.12 Daniele Antonioli 606082 16
Delays Comparison
● Bemin=0;
● Average
Delay=1263[μsec];
● Max
Variation=38[μsec].
● Bemin=3;
● Average Delay=
1372[μsec];
● Max
Variation=200[μsec].
Averages Difference = 109[μsec]
Min Sniffer Uncertainty = ±360[μsec]

17. 05.12.12 Daniele Antonioli 606082 17
Throughput Statistics
Payload = 4B
Data = 16B
Payload = 17B
Data = 29B
Payload = 48B
Data = 64B
# ReTx = 0/50 # ReTx = 0/50 # ReTx = 27/50
# PkLoss = 0 # PkLoss = 0 # PkLoss = 3
Payload = 4B
Data = 16B
Payload = 17B
Data = 29B
Payload = 48B
Data = 64B
# ReTx = 0/50 # ReTx = 0/50 # ReTx = 27/50
# PkLoss = 0 # PkLoss = 0 # PkLoss = 2