NAS Layer Rejection Cause (Location Area / Routing Area)
Location Area Update Reject Cause
00000010 (#2) - IMSI Unknown
00000011 (#3) - Illegal MS
00000110 (#6) - Illegal ME
00001011 (#11) - PLMN not allowed
00001100 (#12) - Location Area not allowed
00001101 (#13) - Roaming not allowed in LA
00001111 (#15) - No suitable cells in LA
Routing Area Update Reject Cause
00000011 (#3) - Illegal MS
00000110 (#6) - Illegal ME
00000111 (#7) - GPRS Services Not Allowed
00001000 (#8) - GPRS/Non-GPRS Services Not Allowed
00001001 (#9) - MS Identity Cannot Be Derived
00001010 (#10) - Implicitly Detached
00001011 (#11) - PLMN not allowed
00001100 (#12) - Location Area not allowed
00001101 (#13) - Roaming not allowed in LA
00001110 (#14) - GPRS Services Not Allowed In This PLMN
00001111 (#15) - No suitable cells in LA
Permission to access the network
All mobile stations with an inserted SIM are members of one out of 10 access classes numbered 0 to 9. The access class number is stored in the SIM. In addition, mobile stations may be members of one or more out of 5 special access classes (access classes 11 to 15) (see GSM 02.11), this is also held on the SIM card.
The system information messages on the BCCH broadcast the list of authorized access classes and authorized special access classes in the system information messages, and whether emergency calls are allowed in the cell to all mobile stations or only to the members of authorized special access classes.
If the establishment cause for the request of the MM sublayer is not "emergency call", access to the network is allowed if and only if the mobile station is a member of at least one authorized:
- access class; or
- special access class.
If the establishment cause for the request of the MM sublayer is "emergency call", access to the network is allowed if and only if:
- emergency calls are allowed to all mobile stations in the cell; or
- the mobile station is a member of at least one authorized special access class.
Operation If the MS is a member of at least one Access Class which corresponds to the permitted classes as signalled over the air interface, and the Access Class is applicable in the serving network, access attempts are allowed. Otherwise access attempts are not allowed.
Access Classes are applicable as follows:
Classes 0 - 9 -Home and Visited PLMNs
Classes 11 and 15 -Home PLMN only
Classes 12, 13, 14 -Home PLMN and visited PLMNs of home country only
Any number of these classes may be barred at any one time.
Emergency Calls An additional control bit known as "Access Class 10" is also signalled over the air interface to the MS. This indicates whether or not network access for Emergency Calls is allowed for MSs with access classes 0 to 9 or without an IMSI. For MSs with access classes 11 to 15, Emergency Calls are not allowed if both "Access class 10" and the relevant Access Class (11 to 15) are barred (GSM 04.08 refers). Otherwise, Emergency Calls are allowed.
call_flow.ppt | |
File Size: | 568 kb |
File Type: | ppt |