This Technical Specification describes the procedures in the network related to location registration. They include: - location updating; - location cancellation; - periodic location updating; - IMSI attach/detach. The procedures in the MS are described in Technical Specification GSM 03.22. The procedures between MSC@ VLR and HLR utilise the Mobile Application Part (MAP) and details concerning the exchange of information are contained in Technical Specification GSM 09.02.