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ZXG10-OB06 (V1.0) Integrated Outdoor GSM Base Station Technical Manual
Figure 20 shows the LAPDm UI-frame structure.
F
I G U R E
UI-frame in LAPDm consists of the following fields:
•
Address field: It consists of SAPI
•
Control field: P represents the query bit
•
•
•
Information
information, measurement report and data indication.
RR/MM/CM Protocol
RR MM and CM are the protocols of three sub-layers of physical layer: RR,
MM and CM. These sub-layers are responsible for control and management.
It arranges the information of the subscriber and system control process
into the designated logical channels according to certain protocol packets.
•
RR Layer: It implements radio resources management, to establish and
release connection between the MS and MSC during the call process.
•
MM Layer: It implements mobility and security management, which is
necessary to process when the mobile station initiates location update.
•
CM Layer: It is responsible for communication management. It
establishes,
subscribers. This Layer provides the following functions:
•
•
•
In ZXG10-OB06 (V1.0), the radio resource management module and
paging module implements RR/MM/CM protocol. It also performs the
processing of the following two types of messages in L3:
40
Confidential and Proprietary Information of ZTE CORPORATION
2 0 – L A P D
U I -
M
F R A M E
Address
Control Information
SAPI
If P=1, it requires the response frame from the opposite-end peer
entity.
If P=0, it does not requires the response frame from the opposite-
end peer entity.
field:
It
holds
and
Call Control (CC)
Supplementary Services Management (SSM)
Short Messaging Service (SMS)
S
T R U C T U R E
000
P
0011
transmits
L3
data,
releases
the
call
for
example,
system
connections
betweens
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