Encryption; References; Start Encryption At Channel Activation - Ericsson RBS 2106 Reference Manual

32

Encryption

Encryption is used for ciphering and deciphering of information to and
from an MS over a dedicated resource. The RBS supports two
encryption modes, either using no encryption or using a GSM
encryption algorithm.
The BSC controls which encryption mode is used.
There are two product variants with different encryption algorithms
implemented:
•
•
32.1

References

/GSM 04.08/
/GSM 08.58/
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to find the appropriate chapter.
32.2

Start Encryption at Channel Activation

Purpose
To initiate encryption mode on a dedicated logical channel.
Precondition and initiation
The function starts encryption if element "Encryption Information" is
provided in the "CHANNEL_ACTIVATION" message.
Element "Encryption Information" is optional when the Channel
Activation types are:
•
•
•
•
Element "Encryption Information" is not supported for Channel
Activation type "Immediate Assign".
Access burst, which is received from MS at handover access, is not
deciphered.
•
•
•
•
•
EN/LZT 720 0008 P2A
2001-11-28
No encryption — GSM encryption algorithm version 1 (A5/1).
No encryption — GSM encryption algorithm version 2 (A5/2).
Normal Assign
Asynchronous Handover
Synchronous Handover
Multislot Configuration
Supported channel numbers: /GSM 05.02:6.4/
Bm + ACCH
Lm + ACCH
SDCCH/8 + ACCH
SDCCH/4 + ACCH (and TN=0)
© Ericsson Radio Systems AB
— All Rights Reserved —
GSM 04.08 (phase 2) version 4.7.0
GSM 08.58 (phase 2) version 4.7.0
Encryption
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