Section: 4.1.1.5 Access class control
Content: The network can restrict the access for certain groups of mobile stations. These groups are also known as access classes. The restriction can apply for access to both domains (common access class control or EAB, depending on EAB configuration) or to one domain only (domain specific access control) (see 3GPP TS 23.122[ Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode ]  [14]). Additionally, the network can alleviate the access restriction in both domains or domain specifically, and allow restricted mobile stations to respond to paging messages or to perform generic location updating, or GPRS attach or routing area updating procedure. A network operator can also restrict some MSs to access the network for location registration, although via common access class control or domain specific access class control the MSs are permitted to access the network for other purposes. Therefore, for each access to the network the mobile station shall determine from the information received via the system information broadcast whether access is allowed or not: - For paging response the mobile station shall evaluate the control information for common access control (as specified in 3GPP TS 44.018[ None ]  [84], 3GPP TS 44.060[ None ]  [76], and 3GPP TS 25.331[ None ]  [23c]), the control information for EAB (as specified in 3GPP TS 44.018[ None ]  [84], and 3GPP TS 25.331[ None ]  [23c]), domain specific access control (as specified in 3GPP TS 44.018[ None ]  [84] and 3GPP TS 25.331[ None ]  [23c]), and the specific control information for paging response (as specified in 3GPP TS 25.331[ None ]  [23c]; see "Paging Permission with Access Control"). - For generic location updating, GPRS attach and routing area updating procedures the mobile station shall evaluate the control information for: - common access control (as specified in 3GPP TS 44.018[ None ]  [84], 3GPP TS 44.060[ None ]  [76], and 3GPP TS 25.331[ None ]  [23c]); - domain specific access control (as specified in 3GPP TS 44.018[ None ]  [84] and 3GPP TS 25.331[ None ]  [23c]); - specific control information for location registration (as specified in 3GPP TS 25.331[ None ]  [23c]; see "Paging Permission with Access Control"); and - EAB as specified for A/Gb mode in 3GPP TS 44.018[ None ]  [84], and for Iu mode in 3GPP TS 25.331[ None ]  [23c]. The same control information shall also be taken into account, when the present document requires the mobile station to initiate a generic location updating, or GPRS attach or routing area updating procedure when it detects that a domain changes from barred to unbarred (see e.g. subclauses 4.1.1.2.1 and 4.1.1.2.2). - For GPRS attach and routing area updating procedures in Iu mode, the mobile station shall evaluate the control information for: - ACDC if the mobile station supports ACDC (as specified in 3GPP TS 25.331[ None ]  [23c]). The same control information shall also be taken into account, when the present document requires the mobile station to initiate a GPRS attach or routing area updating procedure in Iu mode when it detects that PS domain changes from barred to unbarred (see e.g. subclauses 4.1.1.2.1 and 4.1.1.2.2). - For all other purposes the mobile station shall evaluate the control information for common access control as specified in 3GPP TS 44.018[ None ]  [84], 3GPP TS 44.060[ None ]  [76], and 3GPP TS 25.331[ None ]  [23c], the control information for EAB (as specified in 3GPP TS 44.018[ None ]  [84], and 3GPP TS 25.331[ None ]  [23c]), domain specific access control (as specified in 3GPP TS 44.018[ None ]  [84] and 3GPP TS 25.331[ None ]  [23c]) and in Iu mode for PS domain if the mobile station supports ACDC, the control information for ACDC (as specified in 3GPP TS 25.331[ None ]  [23c]).