thanks for your reply
Second question.. here it is
Suppose i want to make a phone call to you.
I dial your MS from my MS.
Connection is establish.
we are talking.
What iam speaking is heard by you 80 ms later. This delay is question here.
Voice is first collected for 20 ms and then processed by vocoder. This gives a delay of 20ms
After x y z we get 456 bits corresponding to 20ms speech. These 456 are then divided into 8 blocks(8 x 57=456). These blocks are then sent one by one over “normal” burst. The first 57 bits of normal burst represents the 20 ms speech block no N, and the second 57 bits of normal burst represents the 20 ms speech block no N+1,.
For this we have to wait for the N+1 speech block to arrive. This again induces a delay of 20 ms.
Thus interleaving induces a delay of 20 ms.
so total delay at my MS is 40 msec.
My call reaches the MSC.
MSC send it towards you.
At transcoder again we will have 64/16 conversion ie RPE-LTP which gives 20ms delay.
At BTS the interleaving takes place. and this again induces the delay of 20 msec.
hence the total delay will be
This theory doesn’t includes transmission delays.
Is it ok?
Also i don’t know reverse of vocoding and de-interleaving will induce the equal delays or not?
MS to MSC total delay we have
20+20 at MS(vocoding+interleaving)
20 at BTS —deinterleaving
20 at transcoder for reverse of vocoding
This gives 80 ms in one direction.
considering equal delay in other end direction
we have 80+80 =160 ms delay for a MS TO MS CALL.
Just for comments from every body