Generic selectors
Exact matches only
Search in title
Search in content

BTS Capacity

Viewing 15 posts - 1 through 15 (of 23 total)
  • Author
    Posts
  • #51869 Reply
    scor
    Guest

    How many subscribers can successful call establishments in one TRX

    Thks

    #51870 Reply
    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)

    #51871 Reply
    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

    #51872 Reply
    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.

    #51873 Reply
    Manoj Gupta
    Guest

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

    #51874 Reply
    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.

    #51875 Reply
    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

    #51876 Reply
    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.

    #51877 Reply
    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.

    #51878 Reply
    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

    #51879 Reply
    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 ?.

    #51880 Reply
    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.

    #51881 Reply
    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

    #51882 Reply
    Prabeen
    Guest

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

    #51883 Reply
    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)
Reply To: BTS Capacity
Your information:




<a href="" title="" rel="" target=""> <blockquote cite=""> <code> <pre class=""> <em> <strong> <del datetime="" cite=""> <ins datetime="" cite=""> <ul> <ol start=""> <li> <img src="" border="" alt="" height="" width="">