tokens: ['The', 'following', 'procedures', 'are', 'specified', 'in', 'the', 'present', 'document', 'a', 'Clause', '', 'specifies', 'elementary', 'procedures', 'for', 'Mobility', 'Management', '', 'mobility', 'management', 'common', 'procedures', 'subclause', '', '', 'TMSI', 'reallocation', 'procedure', 'subclause', '', '', 'authentication', 'procedure', 'subclause', '', '', 'identification', 'procedure', 'subclause', '', '', 'IMSI', 'detach', 'procedure', 'subclause', '', '', 'abort', 'procedure', 'subclause', '', '', 'MM', 'information', 'procedure', 'subclause', '', '', 'mobility', 'management', 'specific', 'procedures', 'subclause', '', '', 'location', 'updating', 'procedure', 'subclause', '', '', 'periodic', 'updating', 'subclause', '', '', 'IMSI', 'attach', 'procedure', 'subclause', '', '', 'generic', 'location', 'updating', 'procedure', 'subclause', '', '', 'connection', 'management', 'sublayer', 'service', 'provision', '', 'mobility', 'management', 'connection', 'establishment', 'subclause', '', '', 'mobility', 'management', 'connection', 'information', 'transfer', 'phase', 'subclause', '', '', 'mobility', 'management', 'connection', 'release', 'subclause', '', '', 'GPRS', 'specific', 'mobility', 'management', 'procedures', 'subclause', '', '', 'GPRS', 'attach', 'procedure', 'subclause', '', '', 'GPRS', 'detach', 'procedure', 'subclause', '', '', 'GPRS', 'routing', 'area', 'updating', 'procedure', 'subclause', '', '', 'GPRS', 'common', 'mobility', 'management', 'procedures', 'subclause', '', '', 'GPRS', 'PTMSI', 'reallocation', 'procedure', 'subclause', '', '', 'GPRS', 'authentication', 'and', 'ciphering', 'procedure', 'subclause', '', '', 'GPRS', 'identification', 'procedure', 'subclause', '', '', 'GPRS', 'information', 'procedure', 'subclause', '', 'b', 'Clause', '', 'specifies', 'elementary', 'procedures', 'for', 'circuit', 'switched', 'Call', 'Control', 'comprising', 'the', 'following', 'elementary', 'procedures', '', 'mobile', 'originating', 'call', 'establishment', 'subclause', '', '', 'mobile', 'terminating', 'call', 'establishment', 'subclause', '', '', 'signalling', 'procedures', 'during', 'the', 'active', 'state', 'subclause', '', '', 'user', 'notification', 'procedure', 'subclause', '', '', 'call', 'rearrangements', 'subclause', '', '', 'DTMF', 'protocol', 'control', 'procedure', 'subclause', '', '', 'incall', 'modification', 'subclause', '', '', 'call', 'clearing', 'initiated', 'by', 'the', 'mobile', 'station', 'subclause', '', '', 'call', 'clearing', 'initiated', 'by', 'the', 'network', 'subclause', '', '', 'miscellaneous', 'procedures', '', 'inband', 'tones', 'and', 'announcements', 'subclause', '', '', 'status', 'enquiry', 'procedure', 'subclause', '', '', 'call', 'reestablishment', 'procedure', 'subclause', '', 'd', 'Clause', '', 'specifies', 'elementary', 'procedures', 'for', 'session', 'management', '', 'GPRS', 'session', 'management', 'procedures', 'subclause', '', '', 'PDP', 'context', 'activation', 'subclauses', '', 'and', '', '', 'PDP', 'context', 'modification', 'subclause', '', '', 'PDP', 'context', 'deactivation', 'subclause', '', '', 'MBMS', 'context', 'activation', 'subclause', '', '', 'MBMS', 'context', 'deactivation', 'subclause', '', 'The', 'elementary', 'procedures', 'can', 'be', 'combined', 'to', 'form', 'structured', 'procedures', 'Examples', 'of', 'such', 'structured', 'procedures', 'are', 'given', 'in', 'clause', '', 'This', 'part', 'of', 'the', 'present', 'document', 'is', 'only', 'provided', 'for', 'guidance', 'to', 'assist', 'implementations', 'Clause', '', 'specifies', 'actions', 'to', 'be', 'taken', 'on', 'various', 'error', 'conditions', 'and', 'also', 'provides', 'rules', 'to', 'ensure', 'compatibility', 'with', 'future', 'enhancements', 'of', 'the', 'protocol']