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Sim Card Registration failure

Viewing 13 posts - 1 through 13 (of 13 total)
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  • #62714 Reply
    sam
    Guest

    Recently it has been found that subs in our network, when they come back after roaming , get a SIM Card Registration failure. The only development in recent time which coincides with this issue is the launch of the competitor site in that area. It works Ok when searched in Manual Mode. However in automatic mode, it doesn’t latch on to our network and this message appears. Drive test was done and it never searched for our network. Pls advise

    #62715 Reply
    sam
    Guest

    Just to add, this has been reported only in that particular area which is a border site and does not seem to be a pan network issue

    #62716 Reply
    sam
    Guest

    Any more inputs required ?

    Somebody pls help

    #62717 Reply
    paraHO
    Guest

    sam

    Have you looked here for some ideas:

    www erlang com/forum/erlang/thread.htx?thread=4752

    www erlang com/forum/erlang/thread.htx?thread=4752&p=1

    #62718 Reply
    sam
    Guest

    Hi paraho

    Inter plmn reselection isn’t there and hence that option doesn’t seem to apply. Yes the coverage could be lower than competitor but I don’t see any reason why sim card reg fail shud come

    #62719 Reply
    SAM
    Guest

    The competitors site is in the other side of the border and the frequency of operations are also different as confirmed from Drive report

    #62720 Reply
    paraHO
    Guest

    It might be answer that you say the subscribers do not latch in automatic mode. If attempting to latch to the new (roam) network it could see these subs handsets as barred or stolen or not paid contract fees etc. This is potentially possible because of SIM Card Registration failed – which the subs authentication failed in that network.

    This could be a commerical decision to force your HLR to agree to a roaming agreement (thus roaming traffic) on new network (new networks cost money, need traffic theirs or someone elses to pay for network). If other network is using (anti-) steering of roaming it could be they use subs handsets in auto roaming mode, lock auto selection to their network – does roaming network send welcome SMS maybe? Ask subs to check if they get SMS and is it still saved.

    This maybe because you say when selected in manual mode subs have no problem getting back to your network (their home network). the auto mode is bypassed.

    Maybe look at make/model of handsets or handsets with particular operating platform (symbian, etc) or where 2G or 3G handsets.

    Also contact other network to find out how they organise roaming registration.

    Could be in that border area the other network change some in BSS or something. I guess at that because I dont know your network or other network. So just give ideas.

    #62721 Reply
    paraHO
    Guest

    So did you find out sam?

    #62722 Reply
    Sandeep
    Guest

    subs not latch to our network when MS at border in our network but roam anyway. help pls advise

    #62723 Reply
    sandeep
    Guest

    Any inputs?

    PlS Somebody help?

    #62724 Reply
    SAM
    Guest

    Paraho.

    Sorry for the late reply

    It was a wrong configuration of the competitor .They had enabled our NDC in their system and that’s why SIM card registration failure came

    #62725 Reply
    naveen
    Guest

    NDC? whats that? This sounds like an interesting problem!

    #62726 Reply
    paraHO
    Guest

    sam thanks for come back. NDC…mmm unusual to find this to be problem generate the SIM Card Registration Failure.

    BR
    paraHO

    naveen

    For GSM applications, a National Destination Code is allocated to each GSM PLMN. In some countries more than one NDC may be required for each GSM PLMN.

    The composition of the MS international ISDN number should be such that it can be used as a global title address in the Signalling Connection Control Part (SCCP) for routing messages to the home location register of the MS. The country code (CC) and the national destination code (NDC) will provide such routing information. If further routing information is required, it should be contained in the first few digits of the subscriber number (SN).

Viewing 13 posts - 1 through 13 (of 13 total)
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