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From: | Alex Zhang |
Subject: | Re: [Discuss-gnuradio] How the upstream block of TDMA engine get the current time of the network |
Date: | Mon, 4 Feb 2013 10:33:01 -0600 |
time indication should be coming from the usrp source block. the rx
On 02/04/2013 01:32 AM, Alex Zhang wrote:
> Previously, the pre-cog introduced a simple implementation of TDMA:
> http://gnuradio.4.n7.nabble.com/Introduction-to-Pre-Cog-td37906.html
>
> I read roughly the code in the tdma_engine.py.
> For the transmitter, it seems that this tdma_engine works like a throttle
> to send the messages to the downstreams only when the time_update is later
> than the time_transmit_start.
> And these time are computed based on the tags in the incoming items
> inserted by upstream block.
> My question is that, where does the upstream block get the correct time? I
> know that the usrp_sink can get_time_now but it is on the very downstream,
> and it is different block which means different thread.
>
> If my question is not clear, please give your comments.
samples are timestamped, which allows the engine to line up with a time slot
-josh
>
> Thanks.
>
>
>
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