[Tinyos-help] wireless communication speed

[João Paulo Amaro da Costa Luz Carneiro]

I do want to send large amounts of data that are sliced to fit small  
packets, and so my main objective is to send them as soon as possible  
using ctp.
My reason to use CTP is because my application is exactly the typical  
scenario of some nodes sensing the data and sending to one or more  
sinks in a multihop network.

Miklos, can you tell me about the slotted mac energy performance? Is  
it any different from the default MAC?

Regards

Joao


Just one question related
On 2009/03/05, at 23:38, Miklos Maroti wrote:

> Hi Omprakash,
>
>>> I think the low data rate is because CTP and you need to understand
>>> and tune that, no MAC tweaking is going to get you higher data  
>>> rate I
>>> guess.
>>
>> Did you tweak CTP forwarding delay timers? CTP does add some delay
>> between the packets.
>>
>> But it also depends on your RF environment and topology.
>>
>> CTP should still give you packets at high rates but you might want to
>> add flow/congestion control. That is what we mean when we say CTP is
>> designed to work with low rates - its absence of other mechanisms  
>> that
>> are necessary for you to get a good performance at high rates.
>
> I think he wants to get around 50-70 full messages per second, which
> you can quite easily achieve with raw ActiveMessageC.
>
> I have absolutely no idea about the internals of CTP. Can you
> elaborate on the communication pattern including info on delays,
> timers, acks, control packets, etc?
>
> Miklos