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Rate limitation by the LTE scheduler?

+1 vote

I have been doing packet captures (tcpdump) of high speed LTE downloads. I have noticed that the rate at the beginning of the trace, even after taking into account the slow start behavior of TCP, is significantly lower than the rate later on.

I have tried to find an explanation for this behavior and I was told that some commercial schedulers are rate limited and that this limitation is lifted after a certain number of packets has been transmitted in a flow. I have also red that unused sub-carriers are switched off in order to save energy and reduce interference to other cells.

On the other hand I was not able to find a description of such behavior in the documentation or in any research paper.

Can anyone verify this behavior?

posted Jun 3, 2015 by anonymous

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+2 votes

As for uplink resources we know we need to know before that how much data UE has to send and how much is in buffer. That is ok but how can we predict the data rate for that data?

+1 vote

As far as I know eNodeB calculates the number of Physical Resource Blocks allocated to each UE, based on the specific metric, then takes the minimal modulation and coding scheme to deduce the transport block size that must be allocated to each user, Why this minimal MCS ? Isn't it too sub-optimal?