Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines page 88

Product Technical Specification & Customer Design Guidelines
Table 7-2: Supported GSM / GPRS specifications (Continued)
Item
Circuit-switched data bearers
Security
Encryption support
PAP for RADIUS authentication
- GPRS / EGPRS
CHAP for RADIUS
authentication - GPRS /
EGPRS
Support for encryption
algorithm UEA1 (Kasumi)
Support for integrity algorithm
UIA1 (Kasumi)
UMTS
WCDMA-to-GPRS reselection
in CELL_FACH
Inter-frequency reselection in
Cell_FACH
Radio link failure
SIB scheduling
SIB modification
Re-establishment procedure
88 Proprietary and Confidential - Specifications subject to change
Comments
These circuit-switched data bearers are supported on 2G
networks:
Asynchronous 9,600 bps
•
Asynchronous 14,400 bps
•
GPRS / EGPRS support GEA1, GEA2, and GEA3 data
ciphering.
GSM CSD and SMS use A5/1 and A5/3 encryption.
PAP (Password Authentication Protocol) is a method of
authenticating usernames and passwords against a database
on a RADIUS (Remote Authentication Dial-In User Service)
server. In a standard login, the service provider prompts for a
username and password. In PAP authentication, the username
and password are entered in the client's dialing software and
sent as one data package, rather than the server sending a login
prompt and waiting for a response.
CHAP (Challenge Handshake Authentication Protocol) is a
more secure method for connecting to a system than PAP. After
a link is established, the server sends a challenge message to
the client. The client responds with a value calculated using a
one-way hash function. The server compares its own calculation
of the expected hash value to the client's response. If the values
match, the authentication is acknowledged; otherwise the
connection is terminated.
UEA1 (UMTS Encryption Algorithm) generates the keystream
as a function of a cipher key that is re-synchronized to every
MAC / RLC frame. UEA is based on the Kasumi algorithm.
UIA1 (UMTS Integrity Algorithm) is the algorithm used to
compute the IK (Integrity Key) used in message authentication.
UIA is based on the Kasumi algorithm.
CELL_FACH is an RRC (Radio Resource Control) service state
in which cell reselection is performed. This feature prevents
dropping of RRC connections.
Radio link failure is a procedure that indicates an 'out-of-synch'
state on one or more radio links. Node B of the RNC (Radio
Network Controller) reports this event before attempting
resynchronization. The radio link restoration procedure indicates
restoration of the 'synchronized' state.
SIB (System Information Block) scheduling controls the
broadcasting of information to user equipment in a cell. The user
equipment retrieves the schedule, and is then able to change to
sleep mode, receiving only those blocks that it needs.
Following a radio link failure, the RNC maintains the RRC
connection, waiting for re-establishment.
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