Thanks Thanks:  1
Showing results 1 to 8 of 8

Thread: Handover between two cells that have same BCCH?!

  1. #1
    Junior Member Reputation: 10
    Join Date
    2011-03-10
    Location
    Egypt/Cairo
    Posts
    22


    Default Handover between two cells that have same BCCH?!

    Hi all,

    I am facing a strange case .
    working in Huawei vendor, I found 2 handover failures from cell A with (BCCH :72 / BSIC : 5-3) to cell B with (BCCH : 72 / BSIC : 4-3) , I checked if this is fake and searched if cell B is on air and I founded it serving in a near place !!

    could that ever happen ?! a HO command between 2 cells that have same BCCH ?!



    I am using Actix in my post analysis , could it be a problem in Actix itself or what?


    Thanks

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many
     

  3. #2
    Member Reputation: 295
    Join Date
    2012-04-15
    Posts
    214


    Default Re: Handover between two cells that have same BCCH?!

    Hi! Please follow this discussion with the same question.
    http://www.finetopix.com/showthread.php?11820-Same-BCCH


  4. #3
    Junior Member Reputation: 10
    Join Date
    2011-03-10
    Location
    Egypt/Cairo
    Posts
    22


    Default Re: Handover between two cells that have same BCCH?!

    Thank you , but the thread is closed and my case is different as Iam talking about 2 cells not 3.

  5. #4
    Junior Member Reputation: 8
    Join Date
    2011-12-24
    Posts
    5


    Default Re: Handover between two cells that have same BCCH?!

    the basic is different so handover will occur

  6. #5
    Member Reputation: 423
    Join Date
    2008-05-20
    Location
    Atlantis :)
    Posts
    439


    Default Re: Handover between two cells that have same BCCH?!

    There is noting interesting to discuss about this case. Change BCCH freq - this is the mandatory if two cells are nearly located ! If you can't do that due to contract clause, just adjust HO margin in order to made HO between cells quick as possible. Also you can adjust tilts, in order to made overlap zone smaller.

    The reason for problem is:
    in border area Cell1 -> Cell2, cell two cause too high interference and MS served by Cell 1 cannot decode HO command.
    Last edited by tremalnike; 2012-05-20 at 11:26 PM Reason: add more info
    Best Regards !

  7. #6
    Junior Member Reputation: 10
    Join Date
    2011-03-10
    Location
    Egypt/Cairo
    Posts
    22


    Default Re: Handover between two cells that have same BCCH?!

    Thank you tremalnike for your answer .. I was just asking if that case is possible or I have a problem in my analysis tool.
    btw , I am working as an analyst only so I don't have access on the network I just find the problems in logfiles and investigate them and then the report goes to higher engineer that is why I was asking about the possibility of the case only .

    sorry if you find the topic not interesting !!

  8. #7
    Member Reputation: 416
    Join Date
    2010-06-16
    Posts
    321


    Default Re: Handover between two cells that have same BCCH?!

    Hi!
    Yes, it is possible: and it is not very big problem.
    Let us assimue you have two neighbor cells unsing same BCCH and different BSIC.
    There is a region where BCCH is not decodable: but maybe some other is clear, so idle mode works.

    For calls using TCH on BCCH TRX this is problem, but if you are hopping over other TRXes, then handovers are fine:
    once terminal detects new cell, handover is OK as hopping call is not interfered by BCCH.

    Of course, we try to avoid it, and we all know terminals have problems with reporting correct BSIC once you
    have two BCCHs too close.

    But to answer your question: yes, it works, and consequencies are not as severe as some people feel.

    BR
    s52d

  9. #8
    Moderator Reputation: 473
    Join Date
    2009-05-02
    Location
    Nearby
    Posts
    1,237


    Default Re: Handover between two cells that have same BCCH?!

    Quote Originally Posted by s52d View Post
    Hi!
    Yes, it is possible: and it is not very big problem.
    Let us assimue you have two neighbor cells unsing same BCCH and different BSIC.
    There is a region where BCCH is not decodable: but maybe some other is clear, so idle mode works.

    For calls using TCH on BCCH TRX this is problem, but if you are hopping over other TRXes, then handovers are fine:
    once terminal detects new cell, handover is OK as hopping call is not interfered by BCCH.

    Of course, we try to avoid it, and we all know terminals have problems with reporting correct BSIC once you
    have two BCCHs too close.

    But to answer your question: yes, it works, and consequencies are not as severe as some people feel.

    BR
    s52d
    In dense area which site to site distance is less this sever will be more than expectation since FACCH decode success rate will decrease

Bookmarks

Bookmarks

Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •