gprs_rlcmac_received_lost() in gprs_rlcmac_meas.cpp

[Andreas Eversberg]

Daniel Willmann wrote:
>> > gettimeofday(&now_tv, NULL);
>> > elapsed = ((now_tv.tv_sec - loss_tv->tv_sec) << 7)
>> > 	+ ((now_tv.tv_usec - loss_tv->tv_usec) << 7) / 1000000;
>>     
> I assume here you're calculating the duration of the measurement period
> so far and since you want to have sub-second accuracy you multiply
> everything with 128. Why 128?
> Is it becasue it simplifies the throughput calculation?
> (tbf->meas.dl_bw_octets/elapsed in gprs_rlcmac_dl_bw())
>   
hi daniel,

yes. first i wanted something more accurate than one second, so i
multiplied the elapsed time with 128. 128 bytes are 1024 bits, so it
simplifies the calculation for kbits/s.
>   
>> > if (elapsed < 128)
>> > 	return 0;
>>     
> Is the intention here that the duration of the measurements is supposed
> to be one second? So every second these measurements are printed out and
> reset?
>   
after every transmitted downlink frame the gprs_rlcmac_dl_bw() function
is called. if at least one second is elapsed, the throughput of the time
that has been elapsed is printed out. it is just a simple solution
without the requirement for a timer for each TBF.

regards,

andreas