Generic selectors
Exact matches only
Search in title
Search in content
Search in posts
Search in pages

Increase in drop rate after BSC change

Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • #51849 Reply
    Arpan
    Guest

    Dear All

    We are facing problem of high call drop rate after site shifted from one BSC to another BSC. Database is correctly defined. Wat can be the possible reasons?? Also problem is in specific cells; not in all cells..

    #51850 Reply
    pix
    Guest

    hello arpan,

    what is the cause of the call drop ? can you find a more specific indicator ?

    if you didn’t change anything on the radio side, the problem is coming from your BSC or your Abis link. Therefore, it’s quite probably vendor specific… Have you tried deleting the BTS & cells and re-creating them ?

    #51851 Reply
    Da Architect
    Guest

    Would it be that old BSC and new BSC belong to two different MSC?
    And when shifted the cell wasn’t created correctly in target MSC?
    Is the new LAC for this cell update in MSC?
    HO relation: this cell must be defined as external to old BSC, or outer to old MSC, with correct CGI.

    #51852 Reply
    Arpan
    Guest

    hi..
    the two bscs are in the same MSC and lac.. the cause of drop is RLTC drop..

    #51853 Reply
    pix
    Guest

    arpan,

    radio link counter timeout… it means the BTS doesn’t receive SACCH frames from the MS or the MS doesn’t receive SACCH frames from the BTS. But it can be caused by a hidden problem.

    Altogether, the TCH is already allocated, it means there is no real radio problem.. possibly, the A interface (or Ater) is wrongly connected.

    what is the average TCH duration in those cells ?

    I would check the A/Ater timeslot definitions… can you perform an A trace?

    a good thing to do is :
    *** a drive test ***

    analyse the layer 3 messages, you will probably see that the TCH is allocated, but then something goes wrong.

    #51854 Reply
    NarChai
    Guest

    possibility cause
    data base of cell incorrect on MSC such as defind wong CI with wrong BSC or signalling point code

    good luck

Viewing 6 posts - 1 through 6 (of 6 total)
Reply To: Increase in drop rate after BSC change
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="">