ase stations to which the MS is subscribed and which it can access. These femto base stations are identified based on a common identifier. The mobile station's local White List may contain the allowable BS-IDs or common identifiers of CSGs and relevant information to help derivation of the actual BS-IDs from the common identifier. In addition, the White List may include absolute or relative location information of CSG femto BS, such as GPS information and overlay macro BS identification. 4.5 Operational states of femto base stations Frequency Assignments (Layers) that Shall be Scanned (Applicable if Femto BS or other Macro BS Operate in a Different Frequency Band) Initial Network Entry, Network Re-entry, and Scanning Mode Scanning and Downlink Synchronization Continue Scanning Continue Detect Cell_ID Scanning Macro BS OSG BS If Cell ID belongs to OSG Continue If MS Prefers femto BS Cell ID Type subset and the MS prefers Scanning if femto BS the BS Not Suitable Continue Scanning CSG BS Detect P-SFH and S-SFH Detect P-SFH and S-SFH If MS a Member of a CSG Continue and Cell ID in White List Scanning if the BS Not Suitable Select Cell and Continue to ACCESS Select Cell and Continue to ACCESS STATE STATE Continue Scanning Detect P-SFH Continue Scanning If LSB of BS-ID matches the Detect S-SFH SP 1 corresponding bits of BS-ID/ CSG-ID in CSG White List Decode LBS of BS-ID (12 bits) Detect S-SFH SP 2 If 48-bit BS-ID in the MS White If 48-bit BS-ID in the MS White Decode MSB of BS-ID (36 bits) Continue Scanning if the BS Not Suitable Select Cell and Continue to ACCESS STATE FIGURE 4-23 Discovery and association process of femto-aware mobile stations [2] contains a group of neighbor base stations for which scanning and association are requested. This message may include the BS-ID of the CSG femto base stations to which the MS is subscribed, if the MS is a femto-preferred terminal, which means it prefers to be associated with a femto BS even though macro stations may be available in its neighborhood. Note that this is a uni