... location ofthe MS and selected administrative information from the HLR, neces-sary for call control and provision of the subscribed services, for eachmobile currently located in the geographical ... identity (IMEI). The EIR has three databases:± White list: for all known, good IMEIs± Black list: for bad or stolen handsets± Grey list: for handsets/IMEIs that are uncertainOperation andMaintenance ... frame). Out of the 26 frames, 24 areused for traffic, 1 is used for the slow associated control channel(SACCH) and 1 is currently unused (see Fig. 5). TCHs for the uplink anddownlink are separated...