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# tch blocking and tch congestion

• This topic has 98 replies, 1 voice, and was last updated 14 years ago by anand.
Viewing 15 posts - 16 through 30 (of 99 total)
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• #52039
mm
Guest

whatis the difference between SDCCH drop and congestion

#52040
help me
Guest

can you help me?
mean: TCh mean holding time

#52041
Mzescavt
Guest

Thanks funny site

#52042
pix
Guest

tch mean holding time: average duration during which a TCH timeslot is allocated to a certain call.

for instance TCH MHT = 20s, it means that your subscribers get a TCH for 20 seconds. Then they probably handover to another cell, so the TCH in this cell is deallocated.

This is NOT the average call duration. You should look at the MHT along with the “HO per Call” indicator.
As far as i remember:
call duration = TCH MHT * (HOperCall + 1)

#52043
ahmed
Guest

what’s the difference when we say

1- Call success rate > = < % 2- Call set up > = < %

#52044
pix
Guest

call success rate = call setup sucess rate * (100% – call drop rate)

#52045
Ayat
Guest

Dear Pix

Some vendor define Call success (100-Call drop rate(%)).

could you explain yhese formula

call success rate = call setup sucess rate * (100% – call drop rate)

#52046
pix
Guest

as you said, it is vendor dependent.
the formula is quite simple… call success is representing the success of a call, from call setup to the call release.

it’s a very global indicator.

the (100% – call drop rate) is useless, because it’s just another way of displaying the call drop ratE. It shows exactly the same info, there is no value-added to such indicator.

#52047
abdel
Guest

hello
can you tell me how i can calculate the HOpercall

thanks

#52048
pix
Guest

number of TCH established for incoming HO / number of TCH established by “normal” call setup

#52049
nitin
Guest

what is mean holding time

#52050
pix
Guest

nitin,

= duration of a call, in average.

#52051
nitin
Guest

how can we define cell utilization??????

#52052
Ayat
Guest

Hello

Cell utilization -Traffic (erl)*100/Traffic design (ERL table (B))

Eg

CELl utilization Per CELL

Cell _1 with real traffic =10 erl
and TCH=12 channel and GOS =2%

so we have to review erlang table B , we will find the design traffic at TCH = 12 and GOS =2% =6.615

Design traffic =6.615 so cell utilization = 10*100/6.615

i hope it is clear

#52053
nitin
Guest

thnx Ayat..

Viewing 15 posts - 16 through 30 (of 99 total)
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