Location Update(LU) Reject Cause

This is a NAS message which is sent to UE when the UE is not allowed to register to the specific network or a specific Location Area.

  

< Cause #11 - PLMN not allowed’ >

 Network send this message when a UE tries to camp on the PLMN (usually VPLMN) which is not allowed for the UE. When it recieves, UE has to do following steps.

i) UE has to store this PLMN in forbidden PLMN list in USIM

UE has to remove this PLMN from 'forbidden LPLMN' list in the following cases.

i) UE is switched off

ii) USIM is removed

iii) User select the PLMN in Manual Selection Mode and it gets accepted by the network.

  

< Cause #12 - LA not allowed’ >

 When a UE have a ‘regionally restricted service’ where it can only obtain service on certain LAs and it attempts to camp on a cell of an LA for which it does not have service entitlement, it recieves the Location Update Reject with Cause #12. When it recieves, UE has to do following steps.

i) UE has to store this LAI in the 'forbidden LAs for regional provision of service' list in UE so that it would not keep retrying the location updating process.

ii) UE gets into 'Limited Service' state.

iii) UE initiate Cell Selection Process

 

UE has to remove this LAI from 'forbidden LAs for regional provision of service' list in the following cases.

i) UE is switched off

ii) USIM is removed

 

< Cause #13 - ‘roaming not allowed in this LA’ >

 When a UE receives the Location Update Reject with Cause #13, UE has to do following steps.

i) UE has to store this LAI in the 'forbidden LAs for roaming' list in UE so that it would not keep retrying the location updating process.

ii) UE has to initiate PLMN selection process (not Cell Selection Process).

 

< Cause #15 - ‘No Suitable Cells In LA’ >

 When a UE receives the Location Update Reject with Cause #15, UE has to do following steps.

i) UE has to store this LAI in the 'forbidden LAs for roaming' list in UE so that it would not keep retrying the location updating process.

ii) UE has to searches for a suitable cell in the same PLMN but belonging to an LA which is not in the ‘forbidden LAs for roaming’ list