ZTE Corporation ZXG-BTS2 Benutzerhandbuch
Chapter 3 - Interfaces and Communications
Confidential and Proprietary Information of ZTE CORPORATION 53
F
I G U R E
2 9
U I F
R A M E
S
T R U C T U R E O F
L
A P
D
M
Address
Control
Information
000
P
0011
SAPI
The UI frame in LapDm is made up of the address field, control field
and information field. The address field contains the SAPI. In the
address field, P represents the query bit; and if this bit is set to 1, it
address field, P represents the query bit; and if this bit is set to 1, it
means requiring the response frame from the opposite-end peer entity.
RR/MM/CM Protocol
The RR/MM/CM protocol, consisting of CM, MM and RR sub-layers, is
responsible for control and management. It packets and arranges the
responsible for control and management. It packets and arranges the
information of the subscriber and system control process into the
designated logical channels according to certain protocols.
designated logical channels according to certain protocols.
1. CM layer: Responsible for communication management, including
establishing a connection between subscribers, maintaining and
releasing a call; it further includes CC (Call Control), SSM (Subjoin
Service Management) and SMS (Short Message Service).
Service Management) and SMS (Short Message Service).
2. MM layer: Mobility and security management, that is, the necessary
processing when the MS initiates location update
3. RR layer: Radio resource management, including establishing and
releasing connection between the MS and MSC during the call process
In the ZXG10-BTS (V2.9), the radio resource management module and
paging module of RSL are used to implement the RR/MM/CM protocol, and
perform the processing of transparent and non-transparent messages in
perform the processing of transparent and non-transparent messages in
L3.
Transparent message: The ZXG10-BTS (V2.9) is responsible for
forwarding this kind of messages, without any analysis or change.
forwarding this kind of messages, without any analysis or change.
Non-transparent message: They are only transmitted between the BSC
and The ZXG10-BTS (V2.9), and the ZXG10-BTS(V2.9) performs
and The ZXG10-BTS (V2.9), and the ZXG10-BTS(V2.9) performs
corresponding processing according to the specific message content.
1. Um interface
The signaling on the Um interface includes all messages of RR, MM and
CM, and most of the messages are transparent to The ZXG10-
CM, and most of the messages are transparent to The ZXG10-
BTS(V2.9).
The L3 message structure on the Um interface is shown in Figure 30.
The L3 message structure on the Um interface is shown in Figure 30.