Special Access Control Class

Special Access Control Class

Value range: Check box,  including level 11 forbidden,level12 forbidden,…till level 15 forbidden

Content: I.e. 11~15 bits of “AC”. It is used for load control,  permitting or forbidding the network access of some special level users. “1” stands for forbidden and “0” for permitted.

Recommendation:  00000

For some special subscribers, GSM specifications have reserved five special access levels 11-15, which usually have higher access priority. A special subscriber can have one or multiple access levels (between 11 and 15) at the same time, which are also stored in the SIM card of the subscriber.

For subscribers with the access levels 0-9, their access right is also applicable to the home PLMN and visit PLMN. For subscribers with the access levels 11-15, their access right is only applicable to the home PLMN. For subscribers with the access levels 12, 13 and 14, their access right is applicable to the area of the country to which the PLMN belongs.

Subscribers with the access level 11-15 have a higher access priority than those with the access levels 0-9.

The access level control parameter consists of 16 bits: C0-C15, which respectively corresponds to 15 access levels in bit mapping mode (C10 is used for permitting emergency call). When a bit is 1, it indicates not to allow MS with the corresponding level to access then cell. Otherwise it indicates to allow the access.