Consumed energy - Strange!

[Nguyen Lan]

Hi,

I write an application running on CC2420 radio and Zigbee MAC
(configuration is below). All the node can talk directly to each others.
I tried to measure consumed energy of nodes in various scenario in which
traffic load sent out by the application is different. I was surprised
to see that the amount of consumed energy doesn't depend on the
scenario. Is it correct?

I heard that energy model in Castalia computes consumed energy based on
the amount of time the radio in active, idle, sleep etc. states, but I
expected that when the application sends less traffic, the radio can
spend more time on the idle or sleep states.

Can you help me to explain this ?

SN.node[*].Communication.Radio.RadioParametersFile =
"../Parameters/Radio/CC2420.txt"
SN.nodes[*].Communication.Radio.TxOutputPower = "-5dBm"
SN.node[*].Communication.MACProtocolName = "Mac802154"
SN.node[0].Communication.MAC.isFFD = true
SN.node[0].Communication.MAC.isPANCoordinator = true
SN.node[*].Communication.MAC.phyDataRate = 250
SN.node[*].Communication.MAC.phyBitsPerSymbol = 2

Thanks,
Nguyen Lan

[Athanassios Boulis]

On 10 February 2012 12:06, Nguyen Lan <nguyen...@gmail.com> wrote:

Hi,

I write an application running on CC2420 radio and Zigbee MAC (configuration is below). All the node can talk directly to each others. I tried to measure consumed energy of nodes in various scenario in which traffic load sent out by the application is different. I was surprised to see that the amount of consumed energy doesn't depend on the scenario. Is it correct?

that's expected.

 

I heard that energy model in Castalia computes consumed energy based on the amount of time the radio in active, idle, sleep

Yes, that's right.

 

etc. states, but I expected that when the application sends less traffic, the radio can spend more time on the idle or sleep states.

 

This depends on the MAC. The MAC dictates the states of the radio. If the MAC is energy-aware and adaptive to traffic (e.g., TMAC) then this will happen. 802.15.4 just keeps a fixed active period. You have to study the protocol if you want to learn more. 

[Nguyen Lan]

Hi,

Thanks, it's clear to me know.

Best regards,
Nguyen Lan

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