Henric,
The maximum theoretical data rate of the CC2420 is 250kbps. However to achieve anywhere near this rate, you have to carefully schedule transmissions to avoid packet collisions and loss. I can't quote you any rates achievable using any of the standard radio libraries or base applications, as I have had some problems with transparency of the code and would rather write my own than try to figure out someone elses. To be honest, I have had a problem using the base applications provided with TinyOS when sending at a high rate from multiple motes and I would very much recommend that you write your own base application if you intend to push a lot of data across the radio.
Using my own base application, I have recieved data from 10 motes, sending 99byte packets at a rate of 7 packets per second (approx. 700bytes/mote/sec or 70kbps total) with virtually no packet loss at all (nearly all motes have 100% success after 5-10 minutes). I am convinced that the radio can handle MUCH HIGHER rates than that, even the 250kbps, though it takes careful software development and knowledge of the CC2420 chip. I need to invest in more motes before I push my network to the limits in terms of data rate, but I thought that I would let you know that the numbers you have seen have grossly underestimated the radio data rate.
Matt
To: [email protected]
From: Henric Kärnhall <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
Date: 07/31/2006 07:56AM
Subject: [Tinyos-help] Maximum data rate on the radio?
Hi
What is the (practical) maximum data rate on the radio? I`m using the
tmote hardware from moteiv.
I have seen these values:
- max 25 packages / sec
- max 29b / package
that is.. 25 * 29 * 8 = 5.8kbps. Correct??
But motive has this information on their homepage:
- "250kbps 2.4GHz IEEE 802.15.4 Chipcon Wireless Transceiver"
I would like to sample data from one or more units at as high speed as
possible and send the sampled data in realtime on radio to a master unit.
/Henric
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