[srslte-users] Measuring latency

[Andre Puschmann]

Hi Steffen,

I guess what you measured is about ok, i.e. no difference. Please note
that when you increase the length of a single RRC message by a few bytes
there is no difference in transmission time for the message. If the eNB
just assigns a larger grant it will be sent in the same amount of time
as the slightly smaller message.

Hope that helps.

Cheers
Andre


On 31/10/18 4:06, Steffen Heber wrote:
> 
> I have added a couple of new fileds in one of RRC layer meassges and
> wanted to measure the end-to-end transmission delay/latency of that
> message because of additional fields. To achieve that I did the
> following: synced the time of sender and the receiver machines to the
> local timezone; used gettimeofday function to find the timestamps of
> message transmission (t1) and reception (t2) at the sender and the
> receiver; the transmission timestamp (t1) was included in the message so
> that the receiver can compute the latency, i.e., delta=t2-t1.
> Unfortunately, I always found delta less than 0 ms.
> 
> Could anyone please give me any pointers to what I am doing wrong or a
> better way to compute the latency of the message? 
> 
> Thanks,
> Steffen
> 
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