Thanks Thanks:  15
Showing results 1 to 8 of 8

Thread: high RRC setup failures,possible reasons

  1. #1
    Member Reputation: 109
    Join Date
    2008-03-08
    Posts
    521


    Default high RRC setup failures,possible reasons

    Hi,
    We have RRC setup issues (RRC setup request are being sent for 4 times without any response from NodeB) in all 3 sectors of a 3g site,which result in blocked calls . investigations shows high downlink transport channel BLER while the RSCP and EcN0 is good, availability is 100% too. what could be the possible causes?

    regards,

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Posts
    Many
     

  3. #2
    Member Reputation: 30
    Join Date
    2010-09-14
    Posts
    31


    Default Re: high RRC setup failures,possible reasons

    Probably it seems that Node-B is not hearing the RRC request sent from UE, hence no reply/command to setup the RRC. There may be several reasons for it.
    Have you checked RTWP Value for that site, also it may be due to Hardware Problem. Plz check if any alarm coming on the site else just try to commission the site again and observe. You may also get the site parameter as well as transmission media verified.
    Last edited by SHIVAM; 2014-12-22 at 04:29 AM

  4. #3
    Member Reputation: 368
    Join Date
    2010-10-19
    Location
    SriLanka
    Posts
    296


    Default Re: high RRC setup failures,possible reasons

    Hi,

    This could be due to High RTWP (May be external Interference) or due to hardware issue in NodeB.I have attched a document that may be useful in troubleshooting access failures
    accessfailurestroubleshooting.rar
    Add me Rep to become a Senior Member :)

  5. Thanks jkpllan3, justdream, la_gleaner, SRRFWIRELESS7, vci07 thanked for this post
  6. #4
    Senior Member Reputation: 587
    Join Date
    2010-01-13
    Location
    Earth
    Posts
    682


    Default Re: high RRC setup failures,possible reasons

    Do a restart of the site as usually that solves 90% of the problems in Huawei equipment or check the board utilization of the NodeB as if board utilization is high usually reject(RRC SSR drops as in your case).
    Or collect the NodeB brdlog from M2000(U2000) at software tab -> NE->(select your NE name)->other(here select BRDLOG and transfer from NE to OSS client.) just use the compress option and open it with FMA to analyze it.
    This way you will have a better idea of what is happening with your NodeB

    B/R
    Still learning.....
    If you find my post useful please add reputation and click on Thank You button

    My default password is: HERE

  7. #5
    Member Reputation: 312
    Join Date
    2009-02-04
    Posts
    483


    Default Re: high RRC setup failures,possible reasons

    if your vendor is e******* check the preamble ramping of PRACH in power control ,as the mobile can not listening of NODEB .

    CHEERS
    Knowledge is power, when shared and applied:)
    "Knowledge is like money: To be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value. — Louis L'Amour”

  8. #6
    Member Reputation: 18
    Join Date
    2010-03-18
    Posts
    66


    Default Re: high RRC setup failures,possible reasons

    check the Packet loss or HW issue in the BBU because it's related to commun issue in all sectores

  9. #7
    Senior Member Reputation: 490
    Join Date
    2008-08-14
    Posts
    2,940


    Default Re: high RRC setup failures,possible reasons

    Quote Originally Posted by tharinduwije View Post
    Hi,

    This could be due to High RTWP (May be external Interference) or due to hardware issue in NodeB.I have attched a document that may be useful in troubleshooting access failures
    accessfailurestroubleshooting.rar
    Dear I read in your document that PreambleRetransMax
    should be 20 otherwise it will affect UE access Failures however I found in my network different values like 7 & 30
    Could you please explain to me what these values mean?

    Excuse me it's still my first days in 3G world..

  10. #8
    Senior Member Reputation: 311
    Join Date
    2009-11-27
    Location
    In the world
    Posts
    310


    1 out of 1 members found this post helpful.

    Default Re: high RRC setup failures,possible reasons

    Quote Originally Posted by shahram View Post
    Hi,
    We have RRC setup issues (RRC setup request are being sent for 4 times without any response from NodeB) in all 3 sectors of a 3g site,which result in blocked calls . investigations shows high downlink transport channel BLER while the RSCP and EcN0 is good, availability is 100% too. what could be the possible causes?

    regards,
    It's quite old document.

  11. Thanks justdream, hakimgsm, SRRFWIRELESS7, jkpllan3, vci07 thanked for this post

Tags for this Thread

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
  •