126
ETSI EN 300 392-7 V2.3.1 (2006-06)
Table A.25: U-OTAR KEY ASSOCIATE STATUS contents Information element Length PDU Type 4 OTAR sub type 4 Key association type 1 SCK subset grouping type 4 Key association status 3 Number of groups 5
GSSI
Type 1 1 1 1
24
C/O/M M M M C M C
C
Remark U-OTAR. Key associate status. SCK (0), GCK (1). Provided if key type = SCK. Provided if "Key association status" = "Address not valid", and indicates the number of GSSI fields that follow. Valid range = 1 to 30. Provided if "Key association status" = "Address not valid". Element is repeated the number of times indicated by the value of the "Number of groups" element and contains each unknown address.
Address extension 24 2 O (see note) NOTE: The address extension element is only present if the network code for which the provided GSSIs relate is different to the serving network.
A.4
PDUs to synchronize key or security class change
A.4.1
D-CK CHANGE demand
Shall be used by SwMI to indicate a cipher key change either in the future or immediately. •
Direction:
SwMI to MS;
•
Service used:
MM;
•
Response to:
none;
•
Response expected:
U-CK CHANGE RESULT or none. Table A.26: D-CK CHANGE DEMAND contents
Information element PDU Type Acknowledgement flag
Length 4 1
Type 1 1
Change of Security Class Key change type SCK use
2 3 1
1 1
Number of SCKs changed
4
SCK subset grouping type
4
SCK subset number
5
SCK-VN
16
SCK data (see note 1)
21
CCK-id
16
Number of GCKs changed
4
GCK data (see note 1)
32
C/O/M Remark M D-CK CHANGE DEMAND. M If "0" No acknowledgement required. If "1" Acknowledgement required. M M C Provided if key change type = SCK; "0" = TMO, "1" = DMO. C Provided if key change type = SCK; (0000) indicates subset of SCKs; (1) to (1111) indicate number of single SCKs to follow. C Provided if SCK use = DMO and Number of SCKs changed = 0. C Provided if SCK use = DMO and Number of SCKs changed = 0. C Provided if SCK use = DMO and Number of SCKs changed = 0. C Provided if key change type = SCK; and Number of SCKs = 1 to 1111; repeated element. C Provided if key change type = CCK, or if key change type = "Class 3 CCK and GCK activation". C Provided if key change type = GCK; Reserved (00002). C
Provided if key change type = GCK; repeated element.
ETSI