Encryption
If encryption mode is set to "no encryption", the RBS updates the key
setting by clearing the stored ciphering key.
When changing encryption mode, downlink ciphering is turned on when
a correct layer 2 frame (deciphered with the new encryption mode) has
been received from the MS.
When the encryption mode is changed, the MS sends a transparent
CIPHER_MODE_COMPLETE message /GSM:04.08:-9.1.10/ to the
BSC.
12.2.3
Encryption Mode Change at Mode Modify
By means of the Mode Modify procedure /GSM:08.58:4.2/, the BSC
orders change of channel mode or encryption mode of an active
dedicated channel group.
Channel numbers supported are described in the section “Start
Encryption at Channel Activation” above.
The function is initiated when an MODE_MODIFY message /GSM:
08.58:8.4.9/ is received from the BSC.
Encryption mode change is carried out according to /GSM:04.08:3.4.7/.
If encryption mode is set to “no encryption” the RBS updates the key
setting by clearing the stored ciphering key.
The function is terminated when downlink ciphering is changed.
110 (306)
EN/LZT 123 2697
R5A
1998-08-13
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