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# BTS Capacity

Viewing 15 posts - 1 through 15 (of 23 total)
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scor
Guest

How many subscribers can successful call establishments in one TRX

Thks

Pix
Guest

Call establishments :
8 call setup procedures per timeslot SDCCH
1 active call per timeslot TCH in full rate
2 active calls per timeslot TCH in half rate

in one TRX, you have 8 timeslots, so it just depends on your configuration.

however, the number of calls is not an information we use, we rather use erlang values (based on erlang B law)

scor
Guest

Thks PIX.

For 2+2+2 config

16*3=48 Active calls(Full Rate Erlang). Am I Right

What about the signalling part timeslots?

Thks

pix
Guest

2+2+2

1 sector 2 TRX = 2*8 timeslots = 1 BCCH + 1 SDCCH + 14 TCH
–> 14 simultaneous calls + 8 simultaneous call setups

2+2+2 –> 42 simultaneous calls + 24 simulatenous call setups.

“1 call setup” is a procedure to seize a TCH, it lasts about 4 seconds.

Manoj Gupta
Guest

How many calls can do from one BTS of Conf. 4 4 4 in full rate capacity

Prabeen
Guest

Hi Manoj,

A maximum of 2160 FR calls shall be made. That is 2160/3 = 720 calls per cell. But remember this is just theorotical calculation giving an average of 25merl to a subscriber.

kalim
Guest

max no of callers, if
4+4+4(using 8 users)=96 users at H.R
4+4+4(using 7 users)=84 users at H.R

4+4+4(using 8 users)=192users at F.R

4+4+4(using 7 users)=168 users at F.R

Rafi
Guest

Dear Kalim,
It looks you have interchanged FR and HR. FR is always less than HR. HR is less than or equal to 50% of FR.

machzar
Guest

hi Prabeen, Pix and all, would you explain to me more why you can get theoritical 2160FR

because from my calculation for 4/4/4 in FR,
I just have only 90 simulatenuos call and only 24 call setup.

it comes from :
1 sector 4 Trx = 4*8 TS = 32 TS
= BCCH + SDCCH + 30TCH
4/4/4 –> 96 call + 24 call setup.

thx before.

pix
Guest

Hi,

the call setup is done on SDCCH and then released.
One call setup lasts only 3 seconds. So the 24 channels are used repeatedly until the 90 TCH are used.

In a restaurant, there are only 2 waiters for 30 tables. The 2 waiters are serving every table once in a while.
The SDCCH is doing the same : it is serving every TCH once in a while (to locate a MS on it).

I hope the analogy works..
(no, no need to tip the SDCCH at the call release)
Cheers
pix

Sineesh C
Guest

Hi Prabeen,

Please Explain the Amazing Technology of supporting 2160(FR)simultaneous User in one BTS.

What is the meaning value 25merl that you given user ?.

Prabeen
Guest

Hi Sineesh,

Its not simultaneous calls. Its capacity of a 4+4+4 cell taking 25merl per sub.

25merl: This is the average erlang that shall be utilized by a subscriber. This value is used for all theorotical calculation for capacity issues.

Calculation: 4TRX supports a maximum of 18.4erl. 18.4/.025 = 736 subscribers. The same for all the 3 sectors gives you around 2200 subscribers. BUT NOT SIMULTANEOUS.

Amex
Guest

Dear Friends
Could you plz help me!!!
Can i put 2RBS per sector (Ericsson 2206, band 900)? Is it posible to synchronize them?
Present logical configuration is 3,3,3 (XRANGE and TCC activated) phisical is 12,12,12 i want to increse it to 4,4,4 means Phizical 24,24,24
Thx
Amex

Prabeen
Guest

Hi,
It depends on number of arfcn u have. How many arfcn do u have?

Amex
Guest

Hi Prabeen. thx for you answer.
we are using hoping and 18 arfcn on them. what can i do? this site serving huge coverage

Viewing 15 posts - 1 through 15 (of 23 total)
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