02-System Description.pdf

ZXUR 9000 GSM
Base Station Controller
System Description
Version: V6.50.202
ZTE CORPORATION
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Revision History
Revision No. Revision Date Revision Reason
R1.0 2014–06–28 First edition
Serial Number: SJ-20140527134643-002
Publishing Date: 2014-06-28 (R1.0)
SJ-20140527134643-002|2014-06-28 (R1.0) ZTE Proprietary and Confidential

Contents
About This Manual ......................................................................................... I
Chapter 1 System Overview ......................................................................1-1
Chapter 2 Interfaces and Protocols..........................................................2-1
2.1 Interfaces .......................................................................................................... 2-1
2.1.1 A Interface............................................................................................... 2-1
2.1.2 Ater Interface (for an External TC)............................................................. 2-1
2.1.3 Abis Interface........................................................................................... 2-2
2.1.4 Gb Interface............................................................................................. 2-2
2.1.5 OMC Interface ......................................................................................... 2-2
2.1.6 CDR Interface .......................................................................................... 2-2
2.1.7 Iur-g Interface .......................................................................................... 2-3
2.2 Protocols ........................................................................................................... 2-3
2.2.1 Protocols in the CS Domain ...................................................................... 2-3
2.2.2 Protocols in the PS Domain .....................................................................2-11
Chapter 3 System Networking...................................................................3-1
3.1 Abis Interface Networking ................................................................................... 3-1
3.2 A Interface Networking ....................................................................................... 3-2
3.3 Ater Interface Networking.................................................................................... 3-3
3.4 Gb Interface Networking ..................................................................................... 3-3
3.5 OMC Networking................................................................................................ 3-4
3.5.1 A Interface Networking ............................................................................. 3-5
3.5.2 Abis Interface Networking ......................................................................... 3-5
Figures............................................................................................................. I
Glossary ........................................................................................................ III
I

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II

About This Manual
Purpose
This manual provides information about the interfaces, networking, operation and
maintenance of the ZXUR 9000 GSM system.
Intended Audience
This manual is intended for:
l Planning engineers
l System engineers
What Is in This Manual
This manual contains the following chapters.
Chapter 1, System Overview Describes the position of the ZXUR 9000 GSM in a network and
basic NEs.
Chapter 2, Interfaces and
Protocols
Describes the interfaces between the ZXUR 9000 GSM and other
NEs in a network and related protocols.
Chapter 3, System
Networking
Describes the networking between the ZXUR 9000 GSM and other
NEs in a network.
I

Chapter 1
System Overview
For the position of the ZXUR 9000 GSM in a network, see Figure 1-1.
Figure 1-1 Position of the ZXUR 9000 GSM in a Network
The ZXUR 9000 GSM is a part of a GERAN. A GERAN contains one or more BSSs.
A BSS consists of one BSC and one or more BTSs.
The BSC and each BTS are connected through the Abis interface. A GERAN and a CN
are connected through the A/Gb interface.
1-1

ZXUR 9000 GSM System Description
1-2

Chapter 2
Interfaces and Protocols
Table of Contents
Interfaces ...................................................................................................................2-1
Protocols....................................................................................................................2-3
2.1 Interfaces
2.1.1 A Interface
The interface between a BSC and an MSC is the A interface. To be specific, the A interface
is between a transcoder (TC) and an MSC.
A TC in a GSM system implements conversion between voice and 64 kbit/s A-law PCM
codes. It also performs data rate adaptation for circuit-switched data services. A TC can
be placed on the BSC side or the MSC side.
The A interface of a BSC supports three types of interfaces:
1. E1/T1 interface
A BSC and an MSC are connected through E1/T1 cables.
2. STM-1 interface
A BSC and an MSC are connected through optical fibers.
3. IP interface
A BSC and an MSC are connected through network cables.
2.1.2 Ater Interface (for an External TC)
The interface between a BSC and a TC is the Ater interface. The TC is separated from the
BSC and installed as an independent system. Thus, resources of the TC can be shared
dynamically.
The Ater interface of a BSC supports two types of interfaces:
1. E1/T1 interface
A BSC and a TC are connected through E1/T1 cables.
2. STM-1 interface
A BSC and a TC are connected through optical fibers.
2-1

2.1.3 Abis Interface
The interface between a BSC and a BTS is the Abis interface. The Abis interface is a
self-defined interface of the BSS. In E1 transmission, the Abis interface supports various
networking modes including star, chain, tree, and ring networks.
The Abis interface of a BSC supports four types of interfaces:
1. E1/T1 interface
A BSC and a BTS are connected through E1/T1 cables.
2. STM-1 interface
A BSC and an MSC are connected through optical fibers.
3. IP interface
A BSC and an MSC are connected through network cables.
4. IPoE interface
A BSC and an MSC are connected through E1 cables or optical fibers.
2.1.4 Gb Interface
The interface between the ZXUR 9000 GSM and an SGSN is the Gb interface. Through
this interface, a BSC is connected to an SGSN.
The Gb interface supports two types of interfaces:
1. E1/T1 interface
The ZXUR 9000 GSM and an SGSN are connected through E1/T1 cables. The access
rate can be N x 64 kbit/s (1 ≤ N < 32) or 2048 kbit/s. The timeslots and bandwidth used
by E1/T1 cables are determined by each operator.
On the Gb interface, the ZXUR 9000 GSM implements the FR, NS, and BSSGP
protocols.
2. IP interface
The ZXUR 9000 GSM and an SGSN are connected through network cables. The
ZXUR 9000 GSM implements the IP, NS, and BSSGP protocols.
2.1.5 OMC Interface
The OMC interface is between the network management system and NEs of the ZXUR
9000 GSM. The network management software manages and configures the ZXUR
9000 GSM only through this interface. The NEs and the network management system
communicate through the TCP/IP protocol.
2.1.6 CDR Interface
The interface between a BSC and an MR server is the CDR interface. The BSC is
connected to the MR server through network cables. The ZXUR 9000 GSM reports Abis
2-2

Chapter 2 Interfaces and Protocols
measurement data to the MR server every 480 ms for network analysis and evaluation,
optimization of adjacent cells, and frequency optimization.
2.1.7 Iur-g Interface
The interface between the ZXUR 9000 GSM and an RNC is the Iur-g interface. This
interface uses IP transmission to exchange control plane information (not user plane
information) between the ZXUR 9000 GSM and RNC.
The Iur-g interface of the ZXUR 9000 GSM supports global resource management in the
following aspects:
l Public measurement
The public measurement flow is used between a BSS and an RNC for joint
management of wireless resources.
l Information exchange
The information exchange flow is used between a BSS and an RNC for information
exchange.
l Wireless resource reserve management
Wireless resource reserve management minimizes the time for requesting resources
and thus reduces the delay in handover.
Public measurement and information exchange both use connection-oriented SCCP
messages. All the public measurement and information exchange messages sent from
a BSC to an RNC are transmitted on one signaling link, and all the public measurement
and information exchange messages sent from the RNC to the BSC are transmitted on
another signaling link. That is, two signaling links exist between a BSC and an RNC.
Handover messages of wireless resource reserve are intended for calls and are also
connection-oriented SCCP messages. Different from public measurement or information
exchange, the wireless resource reserve process uses signaling links similar to call
signaling links of the A interface. That is, a call is implemented only over one signaling
link.
2.2 Protocols
2.2.1 Protocols in the CS Domain
The protocol stack of the CS domain processes voice data related protocols at all layers.
User Plane Protocol Stack of the CS Domain
1. Figure 2-1 shows the user plane protocol stack of the CS domain in E1 or STM-1
transmission mode.
2-3

Figure 2-1 User Plane Protocol Stack of the CS Domain in E1 Transmission Mode
When voice services are transmitted, the AMR/FR/EFR/HR codes can be used. When
data services are transmitted, the RLP protocol is used.
2. IP and IPoE transmission modes
a. Figure 2-2 shows the user plane protocol stack of the CS domain on the Abis
interface in IP transmission mode.
Figure 2-2 User Plane Protocol Stack of the CS Domain on the Abis Interface in
IP Transmission Mode
b. Figure 2-3 shows the user plane protocol stack of the CS domain on the A interface
in IP transmission mode.
2-4

Figure 2-3 User Plane Protocol Stack of the CS Domain on the A Interface in
IP Transmission Mode
c. Figure 2-4 shows the user plane protocol stack of the CS domain on the Abis
interface in IPoE transmission mode.
Figure 2-4 User Plane Protocol Stack of the CS Domain on the Abis Interface
in IPoE Transmission Mode
Control Plane Protocol Stack of the CS Domain
Figure 2-5 shows the control plane protocol stack of the CS domain in E1/T1 or STM-1
transmission mode (Take an internal TC as an example).
2-5

Figure 2-5 Control Plane Protocol Stack of the CS Domain
1. Um Interface
Figure 2-6 shows the control plane protocol stack of the CS domain on the Um
interface.
Figure 2-6 Circuit Service Protocol Stack on the Um Interface
a. Transmission layer (or physical layer or Layer 1): As the first layer of the Um
interface, it provides transmission channels for wireless links and transmits data
through radio waves. It provides channels of different functions to upper layers,
including traffic channels and logical channels.
b. Data link layer: As the second layer of the Um interface, it provides a reliable data
link between an MS and a BTS. It uses the LAPDm protocol, which is dedicated
for the GSM and a variant of the ISDN channel "D" protocol LAPD.
c. Application layer: As the third layer of the Um interface, it controls and manages
protocols, and assigns the information generated in the user and system
control process to specific logical channels according to protocol grouping.
The application layer consists of three sublayers including CM, MM, and RR
sublayers.
2-6

CM sublayer: implements communication management, establishes connections
between users, and maintains and releases calls. The sublayer can be divided
into Call Control (CC), Supplementary Service Management (SSM), and Short
Message Service (SMS) modules.
MM sublayer: implements mobility and security management. It provides
processing when a mobile station initiates location update.
RR sublayer: implements wireless resource management. It establishes and
releases the connection between a mobile station and an MSC during a call.
2. Abis interface
The Abis interface of a BSC can use three transmission modes including E1, IP, and
IPoE transmission modes.
l Figure 2-7 shows the control plane protocol stack of the CS domain on the Abis
interface in E1 or STM-1 transmission mode.
Figure 2-7 Control Plane Protocol Stack of the CS Domain on the Abis Interface
in E1 or STM-1 Transmission Mode
a. Layer 1, the physical layer
E1 cables of 2 Mbit/s or CAT5 cables can be used.
b. Layer 2, the data link layer
The data link layer uses the point-to-multipoint LAPD protocol, which is a
subset of the Q.921 specifications.
The LAPD protocol uses a frame structure, which consists of a flag field,
control field, information field, check field, and a flag sequence. The flag field
consists of two parts including the Service Access Point Identity (SAPI) and
the Terminal Equipment Identification (TEI), which respectively indicate the
accessing service object and entity object.
c. Layer 3, the application layer
It transmits the application part of a BTS. It provides wireless link management
and operation and maintenance functions.
2-7

interface in IP transmission mode.
in IP Transmission Mode
a. If the BSC is connected to an S8001 base station, the upper layer protocol is
RUDP.
b. If the BSC is connected to an SDR base station, the upper layer protocol is
SCTP.
interface in IPoE transmission mode.
in IPoE Transmission Mode
3. A interface (for an internal TC)
l Figure 2-10 shows the control plane protocol stack of the CS domain on the A
interface in E1 or STM-1 transmission mode.
2-8

Figure 2-10 Control Plane Protocol Stack of the CS Domain on the A Interface
It defines the physical layer structure of the MSC and BSC, including physical
and electrical parameters and channel structures.
It is implemented by level 1 of the Message Transfer Part (MTP) of the
Common Channel Signaling System 7 (CSS7) protocol, and uses 2 Mbit/s
PCM digital links for transmission.
b. Layer 2, the data link layer and network layer
The MTP2 protocol is a variant of the High-Level Data Link Control (HDLC)
protocol. The MTP2 protocol uses a frame structure, which consists of a flag
field, control field, information field, check field, and a flag sequence.
The MTP3 protocol and the Signalling Connection Control Part (SCCP) jointly
implement signaling routing.
It includes the application protocol BSSAP of BSSs. Layer 3 maintains
and manages the resources and connections of BSSs, and controls service
connection and release.
l Figure 2-11 shows the control plane protocol stack of the CS domain on the A
interface in IP transmission mode. The protocol stack on the Iur-g interface is the
same.
2-9

Figure 2-11 Control Plane Protocol Stack of the CS Domain on the A Interface
in IP Transmission Mode
4. Ater interface (for an external TC)
Figure 2-12 shows the control plane protocol stack of the CS domain on the Ater
interface.
Figure 2-12 Control Plane Protocol Stack of the CS Domain on the Ater Interface
It defines the physical layer structure of the TC and BSC, including physical and
electrical parameters and channel structures.
It is implemented by level 1 of the Message Transfer Part (MTP) of the Common
Channel Signaling System 7 (CSS7) protocol, and uses 2 Mbit/s PCM digital links
for transmission.
b. Layer 2, the data link layer and network layer
The MTP2 protocol is a variant of the High-Level Data Link Control (HDLC)
protocol. The MTP2 protocol uses a frame structure, which consists of a flag
field, control field, information field, check field, and a flag sequence.
2-10

The MTP3 protocol and the Signalling Connection Control Part (SCCP) jointly
implement signaling routing.
It includes the application layer protocols on the Ater interface. Layer 3 manages
the circuits on the Ater interface, and controls the request and release of TC
resources.
2.2.2 Protocols in the PS Domain
User Plane Protocol Stack of the PS Domain
Figure 2-13 shows the user plane protocol stack of the PS domain.
Figure 2-13 User Plane Protocol Stack of the PS Domain
1. Um Interface
a. GSM RF
The physical layer of the Um interface is the radio frequency part, which uses
the same transmission mode as GSM circuit services and specifies the carrier
characteristics, channel structure, modulation mode, and radio frequency indexes.
b. RLC/MAC layer
The RLC is a radio link control protocol on the air interface between a base
station and an MS. The protocol detects errors of data blocks on the Um interface,
determines and confirms the retransmission of error data blocks.
2-11

The MAC controls the access signaling flow for wireless channels. It determines
the access when a large number of MSs access shared media. In addition, it maps
LLC frames to the physical channels of the GSM.
Different from the MAC in A/Gb mode, the MAC of the GERAN supports:
l One MAC entity with multiple TBFs;
l Encryption on the MAC layer.
c. LLC layer
The LLC, which is a wireless link protocol based on the High-Level Data Link
Control (HDLC) protocol, provides highly reliable encrypted logical links. The LLC
layer retrieves the LLC address and frame fields from the data units at the higher
SNDC layer, and form a complete LLC frame. In addition, the LLC can implement
point-to-multipoint addressing and control the retransmission of data frames. The
LLC is independent from the lower layer wireless interface protocol. As a result,
when another GPRS wireless resolution option is introduced, the modification to
the network subsystem (NSS) can be minimized. The LLC protocol is specified in
detail in the GSM04.64.
d. SNDCP
As a transition layer between the network layer and the link layer, the SNDCP
protocol groups and packs transmission data and sends it to the LLC layer for
transmission. It also determines TCP/IP addresses and encryption modes.
On the SNDC layer, the data sent between a mobile station and an SGSN is
fragmented into one or more SNDC data units. Then, the SNDC data units are
placed in LLC frames.
e. Relay
The relay forwards LLC PDUs between the Um and Gb interfaces.
2. Gb Interface
E1 cables of 2 Mbit/s or CAT5 cables can be used.
b. FR
The FR provides permanent virtual circuits, and transmits user data and signaling
on the Gb interface. If the E1 transmission mode is used between the ZXUR 9000
GSMand the SGSN, the data link layer on the Gb interface uses the FR protocol.
c. Network Service (NS)
The NS layer, which is based on the FR, transmits upper layer BSSGP PDUs.
d. BSSGP
On the transmission platform, this protocol provides a connectionless link between
a BSS and an SGSN for unacknowledged transmission.
e. IP
2-12

Defined by the RFC 791, the IP protocol routes user data and controls signaling. If
the FE transmission mode is used between the ZXUR 9000 GSMand the SGSN,
the data link layer on the Gb interface uses the IP protocol.
Control Plane Protocol Stack of the PS Domain
Figure 2-14 shows the control plane protocol stack of the PS domain.
Figure 2-14 Control Plane Protocol Stack of the PS Domain
The GMM/SM implements protocol processing for GPRS mobility management and
session management, such as attachment/detachment, security management, routing
area update, and PDP context activation/deactivation.
2-13

2-14

Chapter 3
System Networking
Table of Contents
Abis Interface Networking...........................................................................................3-1
A Interface Networking ...............................................................................................3-2
Ater Interface Networking...........................................................................................3-3
Gb Interface Networking.............................................................................................3-3
OMC Networking........................................................................................................3-4
3.1 Abis Interface Networking
The ZXUR 9000 GSM can be configured in various BTS networking modes as required.
If the Abis interface uses the IP transmission mode, the star, chain, tree, and ring modes
are supported in BTS networking.
l For the star networking of the Abis interface, see Figure 3-1.
Figure 3-1 Star Networking of the Abis Interface
In star networking, each site is directly connected to a BSC. The networking mode is
simple, reliable, and easy to maintain. Therefore, it is applicable to densely populated
areas.
l For the chain networking of the Abis interface, see Figure 3-2.
Figure 3-2 Chain Networking of the Abis Interface
Chain networking requires much less transmission devices. It also provides high
reliability due to the bypass function of BTSs. That is, if a BTS fails, another BTS
3-1

that is farther in the cascaded connection takes over, so that the equipment still runs
properly. This mode is applicable to zonal areas.
l For the tree networking of the Abis interface, see Figure 3-3.
Figure 3-3 Tree Networking of the Abis Interface
Tree networking is applicable to scarcely populated large areas. This networking
mode is complicated, which involves many nodes and is not reliable. When a site
fails, its subordinate sites may not be able to operate properly. Therefore, this mode
is generally not used. In ring networking, each BTS has a fixed BSC to access and
has a physical channel in the reverse direction. When a BTS fails to access its fixed
BSC, it can obtain resources from the channel in the reverse direction to re-connect
the BSC.
l For the ring networking of the Abis interface, see Figure 3-4.
Figure 3-4 Ring Networking of the Abis Interface
Ring networking can greatly improve the network service security of BSSs.
In actual engineering, the above basic networking modes are generally combined to
achieve optimal cost effectiveness.
3.2 A Interface Networking
For the A interface networking, see Figure 3-5.
3-2

Chapter 3 System Networking
Figure 3-5 A Interface Networking
3.3 Ater Interface Networking
For the Ater interface networking of the ZXUR 9000 GSM in E1 transmission mode, see
Figure 3-6.
Figure 3-6 Ater Interface Networking of the ZXUR 9000 GSM
3.4 Gb Interface Networking
When the ZXUR 9000 GSM and the SGSN are connected through E1 cables, they use
an E1-based frame relay protocol to implement Gb interface functions. The physical layer
complies with G.703 and G.704 specifications. The access rate can be N x 64 kbit/s (1 ≤
N < 32) or 2048 kbit/s. The timeslots and bandwidth used by E1/T1 cables are determined
by each operator.
In that case, the Gb interface networking can be implemented in direct connection mode
or BSC cascaded connection mode. For the networking diagram, see Figure 3-7.
3-3

Figure 3-7 Gb Interface Networking of the ZXUR 9000 GSM
To connect multiple ZXUR 9000 GSM systems to one SGSN, they can be cascaded and
then connected to the SGSN if the bandwidth permits, so that line resources of the Gb
interface can be saved.
The cascaded connection mode on the ZXUR 9000 GSM side is easy to implement. For
example, ZXUR 9000 GSM1 is directly connected to the SGSN, and ZXUR 9000 GSM2
can be directly connected through E1 links to another PCM port of the DTB of ZXUR 9000
GSM1. By configuration, transparent transmission from ZXUR 9000 GSM2 to the SGSN
can be implemented, without the need to establish an E1 link between ZXUR 9000 GSM2
and the SGSN. Thus, resources are saved.
3.5 OMC Networking
The operation and maintenance center (OMC) of the ZXUR 9000 GSM is connected to the
network management system NetNumen U31 through an IP transmission network.
For the OMC networking, see Figure 3-8.
3-4

Figure 3-8 OMC Networking
3.5.1 A Interface Networking
For the A interface networking, see Figure 3-9.
Figure 3-9 A Interface Networking
3.5.2 Abis Interface Networking
The ZXUR 9000 GSM can be configured in various BTS networking modes as required.
If the Abis interface uses the IP transmission mode, the star, chain, tree, and ring modes
are supported in BTS networking.
l For the star networking of the Abis interface, see Figure 3-10.
3-5

Figure 3-10 Star Networking of the Abis Interface
In star networking, each site is directly connected to a BSC. The networking mode is
simple, reliable, and easy to maintain. Therefore, it is applicable to densely populated
areas.
l For the chain networking of the Abis interface, see Figure 3-11.
Figure 3-11 Chain Networking of the Abis Interface
Chain networking requires much less transmission devices. It also provides high
reliability due to the bypass function of BTSs. That is, if a BTS fails, another BTS
that is farther in the cascaded connection takes over, so that the equipment still runs
properly. This mode is applicable to zonal areas.
l For the tree networking of the Abis interface, see Figure 3-12.
Figure 3-12 Tree Networking of the Abis Interface
Tree networking is applicable to scarcely populated large areas. This networking
mode is complicated, which involves many nodes and is not reliable. When a site
fails, its subordinate sites may not be able to operate properly. Therefore, this mode
is generally not used. In ring networking, each BTS has a fixed BSC to access and
has a physical channel in the reverse direction. When a BTS fails to access its fixed
BSC, it can obtain resources from the channel in the reverse direction to re-connect
the BSC.
3-6

l For the ring networking of the Abis interface, see Figure 3-13.
Figure 3-13 Ring Networking of the Abis Interface
Ring networking can greatly improve the network service security of BSSs.
In actual engineering, the above basic networking modes are generally combined to
achieve optimal cost effectiveness.
3-7

3-8

Figures
Figure 1-1 Position of the ZXUR 9000 GSM in a Network .........................................1-1
Figure 2-1 User Plane Protocol Stack of the CS Domain in E1 Transmission
Mode ......................................................................................................2-4
Figure 2-2 User Plane Protocol Stack of the CS Domain on the Abis Interface in IP
Transmission Mode.................................................................................2-4
Figure 2-3 User Plane Protocol Stack of the CS Domain on the A Interface in IP
Transmission Mode.................................................................................2-5
Figure 2-4 User Plane Protocol Stack of the CS Domain on the Abis Interface in
IPoE Transmission Mode ........................................................................2-5
Figure 2-5 Control Plane Protocol Stack of the CS Domain.......................................2-6
Figure 2-6 Circuit Service Protocol Stack on the Um Interface ..................................2-6
Figure 2-7 Control Plane Protocol Stack of the CS Domain on the Abis Interface in
E1 or STM-1 Transmission Mode............................................................2-7
IP Transmission Mode ............................................................................2-8
IPoE Transmission Mode ........................................................................2-8
Figure 2-10 Control Plane Protocol Stack of the CS Domain on the A
Interface .................................................................................................2-9
Figure 2-11 Control Plane Protocol Stack of the CS Domain on the A Interface in
IP Transmission Mode .......................................................................... 2-10
Figure 2-12 Control Plane Protocol Stack of the CS Domain on the Ater
Interface ............................................................................................... 2-10
Figure 2-13 User Plane Protocol Stack of the PS Domain....................................... 2-11
Figure 2-14 Control Plane Protocol Stack of the PS Domain................................... 2-13
Figure 3-1 Star Networking of the Abis Interface .......................................................3-1
Figure 3-2 Chain Networking of the Abis Interface ....................................................3-1
Figure 3-3 Tree Networking of the Abis Interface ......................................................3-2
Figure 3-4 Ring Networking of the Abis Interface ......................................................3-2
Figure 3-5 A Interface Networking.............................................................................3-3
Figure 3-6 Ater Interface Networking of the ZXUR 9000 GSM...................................3-3
Figure 3-7 Gb Interface Networking of the ZXUR 9000 GSM ....................................3-4
Figure 3-8 OMC Networking .....................................................................................3-5
Figure 3-9 A Interface Networking.............................................................................3-5
I

Figure 3-10 Star Networking of the Abis Interface .....................................................3-6
Figure 3-11 Chain Networking of the Abis Interface...................................................3-6
Figure 3-12 Tree Networking of the Abis Interface ....................................................3-6
Figure 3-13 Ring Networking of the Abis Interface ....................................................3-7
II

Glossary
AMR
- Adaptive Multiple Rate
Abis
- Abis Interface between BSC and BTS
BSC
- Base Station Controller
BSS
- Base Station Subsystem
BSS
- Base Station System
BSSAP
- Base Station Subsystem Application Part
BSSGP
- Base Station System GPRS Protocol
BSSGP
- Base Station Subsystem GPRS Protocol
BTS
- Base Transceiver Station
CC
- Call Control
CN
- Core Network
CS
- Circuit Switched
DTB
- Digital Trunk Board
EFR
- Enhanced Full Rate
FE
- Fast Ethernet
FR
- Frame Relay
GERAN
- GSM/EDGE Radio Access Network
III

GMM
- GPRS Mobile Management
GPRS
- General Packet Radio Service
GSM
- Global System for Mobile Communications
HDLC
- High-level Data Link Control
HR
- Half Rate
IP
- Internet Protocol
IPoE
- Internet Protocol over Ethernet
ISDN
- Integrated Services Digital Network
LAPD
- Link Access Procedure for D-channel
LAPDm
- Link Access Protocol on the Dm channel
LLC
- Logic Link Control
MAC
- Media Access Control
MR
- Measurement Report
MS
- Mobile Station
MSC
- Mobile Switching Center
MTP
- Message Transfer Part
MTP2
- Message Transfer Part layer 2
MTP3
- Message Transfer Part layer 3
NS
- Network Service
IV

Glossary
NSS
- Network Subsystem
OMC
- Operation & Maintenance Center
PCM
- Pulse Code Modulation
PS
- Packet Switched
RF
- Radio Frequency
RLC
- Radio Link Control
RLP
- Radio Link Protocol
RNC
- Radio Network Controller
RR
- Radio Resource
RUDP
- Reliable User Datagram Protocol
SAPI
- ServiceAccess Point Identifier
SCCP
- Signaling Connection Control Part
SCTP
- Stream Control Transmission Protocol
SGSN
- Serving GPRS Support Node
SMS
- Short Message Service
SNDCP
- Sub Network Dependent Convergence Protocol
TBF
- Temporary Block Flow
TC
- TransCoder
TCP
- Transmission Control Protocol
V

TEI
- Terminal Endpoint Identifier
VI

02-System Description.pdf

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02-System Description.pdf