802.15.4 radio

[remo mein]

Hi all,

Good day.

I am currently trying to simulate Framed Slotted Aloha (FSA) protocol in omnet++. I had coded the protocol in C++ but getting way higher throughput than theoretically possible. While i tried to debug the code, i found that if there are more than one transmissions during a slot time, the node nearest to the sink always transmit its data successfully. 

For FSA, i need the sink node to drop the reception whenever it detects more than one node is sending data in a transmission slot.

Can anyone give me some ideas on how can i achieve this? Is there any other way i can make this possible?

This is my network setting:-

**.wlan[*].typename =   "Ieee802154NarrowbandNic" 

**.wlan[*].mac.backoffMethod = "exponential"

**.wlan[*].mac.useMACAcks = true

**.wlan[*].mac.rxSetupTime = 0s

**.radioMediumType = "Ieee802154NarrowbandScalarRadioMedium"

**.radioMedium.backgroundNoise.power = -100dBm 

**.wlan[*].radioType = "Ieee802154NarrowbandScalarRadio"

**.wlan[*].radio.transmitter.bitrate = 250 kbps 

**.wlan[*].radio.transmitter.power = 0.001 W 

**.wlan[*].radio.receiver.sensitivity = -92 dBm 

**.wlan[*].radio.displayCommunicationRange = true 

Thank you for your time.

Regards,

Murukesan

[Levente Mészáros]

A node may receive a transmission successfully even if there are other interfering signals, because they may be too weak to cause errors.

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[remo mein]

Hi Levy,

Good day.

Yes, i am aware of that. However, is there any way i can make the receiving node to drop all reception if there are more than one node transmitting at a  time?

[Levente Mészáros]

You could use the IdealRadio/IdealRadioMedium for this purpose (it has been renamed to UnitDiskRadio/UnitDiskRadioMedium in the prereleases of INET-4.0).

Regards,

levy

On Wed, Jun 6, 2018 at 12:51 PM remo mein <murukesan.l...@gmail.com> wrote:

Hi Levy,

Good day.

Yes, i am aware of that. However, is there any way i can make the receiving node to drop all reception if there are more than one node transmitting a  time?

Thank you for your time.

Regards,

Murukesan

--

[Murukesan]

Hi Levy,

Thank you for the suggestion. IdealRadio/IdealRadioMedium combination is what i am looking for. It drops the frame if there is collision during the reception regardless of the signal strength.

Thank you.

For beginners like me:-

**.wlan[*].typename                     = "Ieee802154NarrowbandNic"

**.wlan[*].radioType                                     = "IdealRadio"

**.radioMediumType                                    = "IdealRadioMedium"

**.radioMedium.backgroundNoise.power    = -100dBm 

**.wlan[*].radio.transmitter.bitrate                = 250000 bps

**.wlan[*].radio.transmitter.communicationRange = 50m

**.radio.transmitterType                              = "IdealTransmitter"

**.radio.receiverType                                  = "IdealReceiver"

Regards,

Murukesan