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# Cell Traffic

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Viewing 11 posts - 1 through 11 (of 11 total)
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Colin
Guest

hi all,

i need to know 1 cell with 27Tch how match erlang and subscribers can afford, with many regards.

pix
Guest

hi colin,

choose 27 channels and 2% blocking, it will output amount of erlangs.

divide result (in erlang) by 0.025, that’s your number of subscribers (25mErl/subs is a good average value).

Colin
Guest

hi Pix,

thx for the quick answer i used the online calculator and the result was 19.250 and i think that means the maximum traffic this cell can afford, but when you check this very cell from the OMC statistics it giving me 42.95 (Traffic Volume on TCH)
so what do u think please

Pix
Guest

The value 42 erlangs, is it only during one hour, or over the whole day ?

Then, are you using Half Rate, or Full Rate ?
If HR, you must multiply the number of channels by 2 : 27 * 2 = 54.

Then, check the congestion rate at the measured hour, and enter this value in the blocking rate, instead of the the value 2%.

Pix
Guest

No… sorry, keep the 2% 🙂

Colin
Guest

no this is only during the busy hour and it’s not HR it is full rate, but the TCH congestion Rate (Overflow) at busy hour for that cell is 11.87%
so u still think i should keep the 2%

cheers

Pix
Guest

Hello,

What is the formula used for traffic volume ? Is it in Erlangs ? Do you see the same kind of values in other cells ? Or are those more realistic (= falling within the limits given by erlang B) ?

In this traffic volume : is it also taking into account packet data ?

And finally, the numbers are just too much of a coincidence… (double of what they should be).
Are you certain there is no HR in the cell ? Could you double check (in statistics for example : traffic in HR vs. traffic in FR). Sorry to be so stubborn, as I said : the coincidence is too good to miss.

Bijoy
Guest

One matter should also be taken care that if your system gos increases your carried erlang also increases;like carried traffic with 2% GOS is less than that with 3% GOS,i think he has got the correct figure,only he has to do is too seek for carrier addition

Colin
Guest

Hi Pix,

you were right to be stubborn because the cell was using HR sorry for the inconvenience but still i have another one with 29 Channels and 27.9 Erlang it doesn’t include packet data am using Huawei BSC6000 and their M2000 for the performance, but still i feel like my blocking rate is more than 2 so what do u think

Pix
Guest

Colin,

The hardest thing to do is ask the right question. I notice that most of the time, when facing an issue, I want to send an email to our tech support. And while writing the question with all details, I can already find the answer myself :))

27 erlangs on 29 TCH is possible, but your congestion rate must be very high ? How high is it ?

>>> Bijoy, the erlang B gives the “offered” traffic, not “carried” traffic, it is very confusing to apply the erl B formula on the actual measurement of the traffic. The measurement gives the “carried” traffic.

Cheers,

David
Guest

Hey,

Colin,
The 27 Erlang u speak is the peak traffic or BHT? N could you tell me out of how many TRX have you arrived to 29 Channels? Lemme do a wild guess.

Viewing 11 posts - 1 through 11 (of 11 total)
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