- This topic has 7 replies, 1 voice, and was last updated 8 years, 1 month ago by ravi.
31st July 2008 at 14:18 #53304HostGuest
Can anyone provide me some info about the access class for mobiles in GSM and the related paratemers in the Alcatel BSS.
thanks in advance1st August 2008 at 05:14 #53305PeteGuest
The Access class for mobiles in hard coded in the SIM. Not sure if any operator uses this.1st August 2008 at 05:31 #53306MKTGuest
GSM recognizes 16 different access classes. This parameter is
stored on the SIM module and allows the network operator to specifically bar
certain types of subscribers. A typical application is to set up an access class
exclusively for the operator personnel for test purposes during installation and
testing. In that case, the system can be on the air but ordinary users do not
recieve access. Another application is to define access classes for emergency personnel
only. This can prevent overload during an emergency and allows rescue
workers to be reachable via mobile phone.
The BTS broadcasts the admitted access classes within the RACH control
parameters, which are part of the information that the BTS permanently
broadcasts in its broadcast control channel (BCCH). The MS reads the information
and compares it with the access classes on the SIM. The MS attempts to
access the system only if it finds a matching access class. That prevents signaling
overload because an unauthorized MS does not even try to access the system.
The access classes in GSM use values from 0 to 15. The numbers do not
indicate any priority as such, that is, a higher number does not imply a higher
priority or vice versa. Table G.2 shows the use of the access classes. “Ordinary”
subscribers receive values from 0 through 9 on a random basis. Only the access
classes 11 through 15 were predefined. Note that one SIM module is capable of
storing several access classes, which allows one subscriber to belong to several
subscriber groups.1st August 2008 at 09:50 #53307HostGuest
Thanks for the info, so i think the only way to priorize the subscriber access to the network is by attributing a high access class and edit some parameters in the OMC. any other issues for Access priority?3rd August 2008 at 05:09 #53308BoGuest
I’d once tested ACL by changing ACL on a cell. And I found it exactly as your document. But I dont know how to assign ACL to a SIM (or how to check the ACL of a SIM), because it seem to be assigned randomly.
Let’s assume that I want to assign ACL to a VIP’s SIM, so that he can access the cell anytime. Thanks.6th August 2008 at 09:37 #53309HostGuest
Any suggestions for my previous request plz.6th August 2008 at 12:30 #53310PanGuest
You needs in eMLPP supplementary service. It is supporting 7 priority levels for subscribers. For more details, see GSM 02.67 and 03.67 spec.
with regards, Pan23rd September 2013 at 04:45 #53311raviGuest
Hi ..can ny one tell me how to change the access class of a sim..or how can i progrm my sim for specific access class in gsm