Re: [Scnsl-users] received power

[<fra...@un...>]

Hi,

virtual_transmissions is a wrong place to check.
The main data structure is transmissions.

The model used by WirelessNetwork is:

p / ( d^a ) >= th

where:

p is the transmission power (the power used by the sender)
d is the distance between the sender and the nodes
a is the attenuation factor (how much the power degrades w.r.t. the distance)
th is the receiver thrashold

If the formula holds, the receiver is able to get a packet from the sender.
The current sender transmission power is stored into transmissions,
and it is a duplicated value: the original is stored into the wireless node.
In no place is stored the power sensed by the receiver
(and if I have understand, this is what you want).
Of course, you can add a field into transmissions, to store the sensed power.

MacNode_802_15_4_tlm_fifo_t does no have any way to get
the power with whom the packet was received.

The simplest way to get the information is:

1) add into Packet_t a field to store the receiving power.
2) before each calling the sendToNode inside the network,
update the field: remember! each time since each destination will
sense a different value
3) into the node proxy, read such a new information
4) using the node proxy, forward this information to the node

Since the 802.15.4 model is a children to Wireless node,
you can just change the wireless node to allow your "user application"
to get the sensed power (avoid to change the 802.15.4: it is not very simple).
And you can also add a method getSensedPower to the simple transmission interface.

I hope this will be useful.

Best regards,
Francesco Stefanni


----- Original Message -----
From: Ramón Ayuso Ramírez <ram...@gm...>
Date: Friday, July 2, 2010 20:34
Subject: [Scnsl-users] received power
To: scn...@li...

> Hi everyone,
> I'm a new member of this mailing-list. I am simulating a 
> wireless 
> network and I need to know the received power from other nodes. 
> This 
> received power is calculated by WirelessNetwork_t.i.hh and 
> stored in 
> _virtual_transmissions.
> 
> But I don't get to know the received power using the 
> MacNode_802_15_4_tlm_fifo_t class. I think I must change this 
> class, but 
> I don't get it.
> 
> Thank you very much.
> Regards,
> Ramon
> 
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