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SSD update is initiated by the test set and Makes SSD sharing with serving VLR less of a security concern.

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Posted by waqqas1

The SSD update is initiated by the test set and can be performed either in idle state or in a call. It is used to test the MS's ability to synchronize SSD_A with the test set and ensures that the MS and the test set have identical copies of SSD_A.

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Posted by sagitraz

¦=> Used to initialize and periodically change the SSD value in the MS
¦=> Makes SSD sharing with serving VLR less of a security concern
¦=> SSD Update can be carried when the MS is in Idle state or when it is in Traffic State.

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Posted by alaxander