- This topic has 12 replies, 1 voice, and was last updated 10 years, 11 months ago by paraHO.
15th May 2010 at 13:57 #62714samGuest
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 advise15th May 2010 at 13:59 #62715samGuest
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 issue15th May 2010 at 17:40 #62716samGuest
Any more inputs required ?
Somebody pls help15th May 2010 at 18:13 #62717paraHOGuest
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=115th May 2010 at 19:06 #62718samGuest
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 come16th May 2010 at 06:15 #62719SAMGuest
The competitors site is in the other side of the border and the frequency of operations are also different as confirmed from Drive report16th May 2010 at 08:37 #62720paraHOGuest
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.18th May 2010 at 09:14 #62721paraHOGuest
So did you find out sam?20th May 2010 at 11:38 #62722SandeepGuest
subs not latch to our network when MS at border in our network but roam anyway. help pls advise21st May 2010 at 21:15 #62723sandeepGuest
PlS Somebody help?26th May 2010 at 09:37 #62724SAMGuest
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 came28th May 2010 at 15:26 #62725naveenGuest
NDC? whats that? This sounds like an interesting problem!30th May 2010 at 11:52 #62726paraHOGuest
sam thanks for come back. NDC…mmm unusual to find this to be problem generate the SIM Card Registration Failure.
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).