3G RBS overview and hardware guide

3G RBS overview
Field support & operations

© Ericsson AB 2010 Wissam Yamout Field Support January 2010
2
Contents
Session 1:
– Overview
– Hardware description:
CF
FAN
FCU
Filter Subrack
Radio Subrack
Digital Subrack: CBU, ET, RAX, TX, RUIF
Antenna System: ASC, RET
Session 2:
– Element manager
Main window
Views: ATM, ATM Relations, Equipment, IP, IP Relations,
Software, etc…
How to: connect client to RBS, install and start EM, create
a CV, restart a node, replace a board, restore a CBU,
preventive maintenance, ASC checks and troubleshooting,
etc…

3
Session 1
This session will contain an overview about RAN
network, and a brief description about different verities
of hardware units involved inside the RBS.
After this session we will be able to understand
different functions of different hardware units, capacity
limits, naming.

4
Overview
Core Network: The CN provides call control as well as
mobility for, and localization of, the User Equipment (UE).
The CN also interacts with the Radio Network Controller
(RNC) and supports network features and
telecommunication services. The CN handles both packet-
oriented services, such as data, and circuit-oriented
services, such as speech.
Radio Access Network: The RAN consists of the Radio
Network Controller (RNC) and the Radio Base Station (RBS)
node. The RAN provides the connection between the CN
and the UE.
Operation & Support System Radio Control: OSS-RC is
software that handles O&M tasks for the WCDMA RAN.
OSS–RC is designed for handling daily network operation
and maintenance tasks. It complements the Element
Manager (EM) functions implemented in the nodes to create
a complete network element management environment for
the network.
RBS node provides radio resources and handles radio
transmission and reception to and from the UE

5
Hardware - Overview
A: Connection Field (CF)
B: Fan
C: Fan Control Unit (FCU)
D: three wire -48 V DC
E: Filter Subrack The filter Subrack contains the following:
– Filter Unit (FU)
– Dummy board
F: Radio Subrack The radio Subrack contains the following:
– Radio Unit (RU)
– Power Distribution Unit (PDU)
G: Digital Subrack which contains the following:
– Control Base Unit (CBU)
– Exchange Terminal (ET) board
– Random Access and Receiver (RAX) board
– Transmitter (TX) board
– Radio Unit Interface (RUIF)

6
Hardware Description - CF
Connection Field:
– A: Site local area network is used to
communicate with the Base Station
Element Management (BEM). The
interface consists of an RJ-45
connector.
– B: Transmission interface can be
equipped with up to 32 female RJ-
45 connectors. Internal connections
are made between the connection
interface and the CBU and between
the connection interface and any
optional ET boards in the digital
Subrack.

7
Hardware Description - Fan
The fans cool the RBS. They are situated behind the
power connection unit and the FCU, accessible from
the top of the RBS.
Number of fans, RBS 3206E and RBS 3206F: 3

8
Hardware Description - FCU
Fan Control Unit: is a single unit that controls
and supervises up to four internal fans:
– Is the main – machine interface for fans
– The FCU supplies -48 V DC to each fan,
whose speed is controlled by pulse width
modulation control signals.
– The FCU has three indicators that display
FCU and fan status
– Communicates with the RBS through the
EC bus, receiving speed setting
requirements and sending fan status
– Triggers an alarm when fan speed is too
low
– Supplies power to the XALM (external
alarm unit)

9
Hardware Description – Filter Subrack
The filter Subrack contains filter units:
– The FU contains RX and TX filters, duplexer and a Low-Noise Amplifier
(LNA). It also handles the RF carrier splitting.
– The FU is connected between the Radio Units (RU) and two duplex
antenna feeder branches, Ant. A and Ant. B, for transfer of uplink (RX)
and downlink (TX) RF signals.
– Downlink (TX) signals are filtered in the FU before transfer to the antenna
and uplink (RX) signals from the antenna are filtered and amplified before
transfer to the RU.
– The FU also provides DC power for and communication with Antenna
System Controller (ASC), Remote Electrical Tilt Unit (RETU).
– The FU consists of two main physical units:
Radio Frequency (RF) board
Duplex and Receiver (RX) bandpass filter
Number of units, RBS 3206F and RBS 3206E: 1 – 6

10
Hardware Description – Radio Subrack
The radio Subrack contains most of the Radio Frequency (RF) processing
hardware that handles Digital to Analog (D/A) and Analog to Digital (A/D)
conversion, RF modulation and demodulation, and RF carrier combining.
The RU:
– Amplifies the signals received from the FU
– Performs analog – digital conversion of radio signals
– Supplies DC power to the FU and to:
Antenna System Controller (ASC)
Remote Electrical Tilt Unit (RETU)
– Performs digital Pre-Distortion
– Amplifies the signal to the antenna
– Supplies DC/DC conversion for internal purposes
– Can issue temperature alarms by means of internal temperature sensors located
at critical hot spots
RU21 has two carriers downlink, and one carrier uplink (with two-branch
diversity).
RU22 has two carriers downlink, and two carriers uplink (with two-branch
diversity).

11
Hardware Description – Radio Subrack
RU Subrack also contains the Power Distribution Unit.
The PDU is used for the following:
– Supplies the RU and the digital Subrack (through the
CBU) with -48 V DC power. The supply to the CBU has
10 ms hold-up.
– Protecting CBUs from incorrect polarization
– Distributing power to the Fan Control Unit (FCU)
– Contains circuit breakers
The PDU includes the following:
– A Surge Protection Devices (SPD)
– A system voltage test port
Number of units: 1

12
Hardware Description – Digital Subrack
Handle dedicated and common channels to User Equipment (UE).
Consists of an interface for connection to a Radio Network
Controller (RNC), a Main Processor (MP), and the external
Asynchronous Transfer Mode (ATM) interface termination.
Also contains all functions in the baseband domain, except for
average output power limiter, power clipping, and delay and gain
adjustment, which are all located in the radio Subrack.
Includes a backplane
Can include the CBU, ETMC1, ET-MFX, RAX, TX, and RUIF.

13
CBU
The Control Base Unit implements the following:
An MP for control and contains the software for all the units on the node.
An ATM switch for all boards connected to the backplane in the digital Subrack.
A Timing Unit (TU), which provides clock signals for synchronization.
An ET board function, which provides 4 E1 ports to the transmission network.
Power supply to the digital Subrack through the backplane.
Number of units, RBS 3206F and RBS 3206E: 1 – 2.

14
ET-MC1
The Exchange Terminal board implements transmission ports. ET boards
can be used when the CBU does not have enough ports, or when another
type of transmission standard is required.
ET Terminology:
– The first letters:
M ATM with AAL2 Multiplexers
C TDM interface for Circuit emulation
MF Multi Function
A “G” stands for Gigabit Ethernet
An "X" stands for Ethernet switch
– Digits:
1 PDH based on level 1 interface 1.5 - 2 Mb/s
2 PDH based on level 2 interface 6 - 8 Mb/s
3 PDH based on level 3 interface 34 - 45 Mb/s
4 SDH based on level 4 interface 50 - 155 Mb/s
– One digit indicates line rate. Two digits indicates line rate and lowest
framing level

15
ET-MFX
Is a multi-port Ethernet switch blade with IP
termination and inter-working functionality.
It provides six 10/100/1000BASE-T electrical ports
on Emily connectors and one connector which can
connect an SFP module for optical interfaces.
Number of units: 0-1

16
RAX
Random Access & Receiver board implements the uplink digital processing.
The RAX boards available in an RBS receive uplink data from the mobile device users. The
process of incoming data is shared by all RAX boards in the RBS baseband pool.
RAX boards are available with various processing capabilities and demodulation modules.
Extra capacity is added by license keys or by adding more boards up to maximum capacity.
The unit has the following functions:
– Deserializing: convert data between serial data and parallel interfaces in each direction.
– Demodulation: extracts modulation from a radio carrier wave.
– Decoding

17
TX
The TX board implements the downlink digital processing.
TX boards are available with various capacity and capabilities. Extra capacity is
added by license keys or by adding more boards for load-sharing up to maximum
capacity. Additional TX boards can be added for redundancy when low capacity is
required.
The unit has the following functions:
– Soft and softer handover
– Transport channel handling
– Encoding
– Modulation and spreading
– Physical channel combining

18
RUIF
Radio Unit Interface
The RUIF contains point-to-point connections through cables to
the RUs.
Receives BB (Baseband) clock and Node B Frame Number
(BFN) from the Control Base Unit (CBU), and selects one of
the two signals
Distributes BB clock and BFN to six RUs
Distributes BB clock and BFN to six Random Access and
Receiver (RAX) boards and two Transmitter (TX) boards
Transfers control data in RS-485 format to and from six RUs
Transfers data in Ross format to and from the RUs for
distribution to up to six antennas
Receives six gamma bus lines from the RUs in Uplink (UL),
and distributes each line to six RAX boards
Receives six gamma bus lines from the TX boards in Downlink
(DL) for transferring to the RUs, one line to each RU

19
Hardware Description – Antenna System
The HW units are as follows:
– Filter Unit (FU)
– Feeders
– Antenna System Controller
(ASC)
– Remote Electrical Tilt Unit
(RETU)
– Antenna

20
ASC
Why ASC ?
– Amplifies RX-signals to compensate for feeder
loss
– Increases uplink coverage
– Supervises antenna
– Supplies power to an external unit, such as
the RETU
– Controls an external unit
Functional blocks of ASC:
– Bias-T: separates DC power and control
signals from radio frequency signals
– Duplex filter (DPX): separates the RX and TX
signals
– Low Noise Amplifier (LNA): amplifies the RX
signal
– DC Supply (DC/DC): converts the voltage
supplied via the feeders to necessary internal
voltages
– Antenna Supervision (Ant Sup): supervised by
a directional coupler which monitors Voltage
Standing Wave Ratio (VSWR) and forward
power

21
RETU
Remote Electrical Tilt Unit
The RETU adjusts electrical down tilt in a RET/MET
antenna by mechanically turning the antenna phase
shifters. The RETU unit is controlled by the RBS
through the Antenna System Controller (ASC).

22
Session 2
This session will contain related stuff to element
manager, how to install it, access a node using EM,
different windows and tools found inside EM.
Finally we will finish the presentation with a How to
section, that will include major procedures used in day
to day routines by Field Engineers.
After this session we will be able to access EM,
understand how to navigate its different options. In
addition to how we can successfully troubleshoot an
RBS3206 node.

23
Element Manager
The Element Manager is an application for managing a
node through Managed Objects (MOs).
The Element Manager is model-driven, which means
that the Graphical User Interface (GUI) is generated
from information retrieved from the Managed Object
Model (MOM).
Field engineers use the Element Manager during visits
to a node to perform maintenance, fault-tracing, or
repair activities.

24
Element Manager – Main Window
All operations that can be performed from the Element Manager are available from menus in
the menu bar or by selecting a specific MO.
A containment view with all MOs configured on the node is displayed in the MO Tree in the left
pane

25
Menu bar

26
View Selection Bar
The view selection bar provides the following ways of navigating
between views:
– The Back and Forward arrows are used to navigate between
recently visited views. This corresponds to standard web browser
behavior. If columns have been added to a specific view instance,
they are kept.
– The view selector is a drop-down list. A selected view will be
loaded with its standard column layout.
– The View Descriptions button opens a separate window with all
available views with descriptions

27
MO Tree
The MO Tree shows the tree structure of MOs defined in the current view.
The Element Manager gives access to the MO tree and the functions to
browse and control the different views of MOs. The Containment view
includes all MOs on the node, presented according to the MOM structure.
To focus on parts of the MO Tree , the following functions can be used:
– Expand the MO Tree by clicking the + sign in front of a collapsed MO or
folder element.
– Collapse the MO Tree by clicking the - sign in front of an expanded MO or
folder element.
– Use Expand Below in the shortcut menu or in the View menu, to expand
all levels of the branch below the selected MO.
– Show a partial MO Tree branch by addressing an MO from any Open In
button in the MO Properties or Search windows. To expand the MO
completely, first click the - sign of the partially expanded MO, then click the
+ sign. Then all subordinate MOs are loaded from the node.

28
Tab control
The right pane of the main window consists of a tab control. There are four
default tabs: Table , MO Properties , Description and Views. Some
predefined views can have additional tabs, for example the Licensing
view.
Table Tab:
– The Table tab can be used when attributes for several MOs need to be
visible at the same time.
MO Properties Tab:
– The MO attributes are displayed in the MO Properties window for the MO
Description Tab:
– The description for the selected MO or folder is shown. The information is
retrieved from the MOM.
Views Tab:
– All views that have the selected MO as top object are listed here.

29
Element Manager - Views
The following predefined views are available in the
Element Manager:
– Containment view
– ATM view
– ATM Relations view
– Equipment view
– IP view
– IP Relations view
– Licensing view
– Radio Network view
– Software view

30
Element Manager – Views
Containment view
The Containment view shows the relations between all
MOs, parent to child, as defined in the MOM, and
provides an overview of the MO structure of the whole
node
The MO Tree in the Containment view contains all the
top level MOs, for example Equipment,
SwManagement, and TransportNetwork
Note:
– Expanding the whole MO Tree can take several minutes
depending on the size of the node.

31
ATM view
The ATM view provides access to information and
parameters required to manage ATM:
– Virtual connections used to transport voice and data calls
– Signaling information
– O&M information related to ATM
– Configuration of the signaling service, UNI-SAAL
– Synchronization information for network synchronization
In this view, MOs are grouped in the folders under
TransportNetwork MO

32
ATM Relations view
The ATM Relations view provides access to configuration and
status information for ATM resources on the node. It includes
folders with different stacks where both parent-child relations and
reference attributes are used.
The ATM Port stack folder shows information starting from an
ATM port to the logical connections, VclTp, that use this ATM port.

33
Equipment view
The MO Tree in the Equipment view displays an overview of the
hardware in the node, The hardware can, for example, be
subracks, slots, fan, and hardware represented by MOs.

34
IP view
The IP view provides access to the connections and setup
parameters needed to support the Internet Protocol and IP routing.
It includes IP O&M for management of the node.
For nodes with IP Transport, it also shows Iub-related IP
information. From this view, several functions can be handled, for
example:
– IP protocol layer, with IP forwarding
– IP routing table
– IP Access hosts

35
IP Relations view
The IP Relations view provides configuration and status
information for IP resources on the node. It includes folders with
different stacks where both parent-child relations and reference
attributes are used.
– The ET hosts stack folder shows the ET hosts up to PlugInUnit
level.
– The SPB hosts stack folder shows the SPB hosts up to
PlugInUnit level. It is possible to see the relationship between the
host and the ET-boards from the IpInterface MO.
– The GPB hosts stack folder shows the GPB hosts up to
PlugInUnit level. It is possible to see the relationship between the
host and the ET-boards from the IpInterface MO.

36
Licensing view
The Licensing view enables handling of licenses.
The MO Tree in the Licensing view contains:
– Licensing which contains license attributes including the
emergency state.
Licenses Tab:
– The licensed features and licensed capacities can be viewed in
the Licenses tab.
– The following tasks can be performed:
Open license key file for the node.
Display MO properties for the MO currently selected in the table

37
Radio Network view
The MO Tree in the Radio Network view contains MOs that are
related to radio and traffic. In the Radio Network view, it is, for
example, possible to see if sectors are enabled or not.
In the view, the following additional shortcut menu option is
available:
– Switch TU This option can be used for switching operational
modes for the Timing Units (TU) if redundant TUs are configured
on the node.

38
Software view
The Software view enables various tasks related to software
management to be initiated and controlled.
Configuration Version Tab:
– Create a new CV
– Set the selected CV to be the CV that is automatically used when
the node is restarted, that is, set the CV as startable
– Restart the node with the selected CV
– Add the selected CV to the Rollback List
– Remove the selected CV from the Rollback List
– Display the properties of one selected CV or general properties for
all CVs

39
How to connect client to RBS ?
The client can be connected to the RBS through an
Ethernet cable and an adapter cable, which has an RJ-
45 connector at one end and an Emily connector at the
other end.
Connecting the Ethernet Cable to the Client:
– A crossed Ethernet cable is required to communicate
through the Ethernet port to the RBS.
– We have two different types of connectivity:
RBS configured for ATM.
RBS configured for IP.

40
RBS configured for ATM
If the RBS is configured for ATM or dual-stack traffic, connect the client to the CBU,
either directly, or indirectly through a connector in the leftmost Connection Field
(CF) that is connected to the CBU.
To connect the client to the CBU, do
the following:
– Connect the adapter cable to the
CBU.
– Connect the Ethernet cable from
the client to the adapter cable
To connect the client to the CF, do
the following:
– Insert the Ethernet cable from
the client into the into the left-
hand side socket.

41
RBS configured for IP
If the RBS is configured for IP traffic, connect the client to the ET-MFX board, either directly or
indirectly through a connector in the CF that is connected to the ET-MFX.
To connect the client to the ET-MFX, do the following:
– Insert the Ethernet cable from the client into the ET-MFX board port D.
However, in certain cases, the client must be connected to the CBU. If this is required, do the
following:
– If the application uses CORBA, change the default gateway on the client to the node's local IP
address (the Ethernet link IP address). This is usually 169.254.1.1, the Automatic Private IP
Addressing (APIPA) address.
– Connect the adapter cable to the CBU.
– Connect the Ethernet cable from the client to the adapter cable

42
How to install Element Management application ?
We will describes how to install and start an Element
Management Application on a Windows client.
The Element Management Applications and the
installer require that a Java version 1.5 is installed as
the Java Runtime Environment (JRE). It can be
obtained by downloading JRE 1.5 from Sun at:
http://java.sun.com/products/archive
JRE 1.5 is also called JRE 5.0 and is included in the
JDK 5.0 and J2SE 5.0 packages.

43
How to install Element Management application ?
The EM installation package resides on the node and
can be downloaded from a web page located on the
node. The web page can, for example, be found in the
following location:
– <http://<ip address to the node>/em/index.html>

44
How to start Element Management application ?
Start an EM application by using a start icon or link. The location of the start icon or start link is
selected during the installation. To start an EM Application, perform the following steps:
– Use the start link or start icon created on your client to start the EM application.
– The Connect to Network Element window is displayed. Enter the address to the node in the
Address field or select a bookmarked address in the list.
– Click Connect.
The software for the EM applications may need to be updated. If an update is necessary, the
new version of the software is automatically downloaded from the node.
The EM application is now started and ready to be used.

45
How to create a CV ?
Creating a CV means that a backup of the current configuration is created locally
on the node. The created CV can be used for node restart.
Right-click on any CV under the additional tab CV and select CV Create... from the
shortcut menu. The CV Configuration window is displayed.
In the name field, enter the name of the new CV.
If the CV is to be placed in the Rollback List, select a position for the CV in the
rollbackList combo-box. If the CV is not to be placed in the Rollback List, set the
value in the rollbackList combo-box to Not in list . This CV will then not be used
for rollback.
In the operatorComment field, state the reason for creating the CV. This
information is optional.
Click Create to save the new CV and to close the window. Click Refresh to see the
new CV

46
How to set CV as startable ?
The "startable" CV is the CV that will be loaded at the
next node restart.
The CV is set to state startable without any
confirmation window.
– Using shortcuts directly in the shortcut menu for the CV:
Right-click on the relevant CV and select Set startable
from the shortcut menu.
– Using the CV Configuration window: Click Set Startable

47
How to restart the node with a particular CV ?
To perform this operation, you must have authority to restart the node.
Using shortcuts directly in the shortcut menu for the CV:
– Right-click on the relevant CV and select Reload with this CV from the shortcut
menu.
– A confirmation window is displayed.
Using the CV Configuration window:
– Click Reload with this CV .
– A confirmation window is displayed.
In the confirmation window, set the restartRank to Warm , Refresh , Cold or Cold
with Test .
– Warm restart is recommended, as it causes the least traffic disturbance. Set the
restartReason and restartInfo based on the reason for the changing the CV.
Click Execute . The CV is automatically set to state startable and the node is
immediately restarted

48
How To ?
How to do preventive maintenance ?
How to replace board ?
How to restore CBU ?
How to install upgrade package ?
How to upgrade node with upgrade package ?
How to replace Fan unit and FCU?
How to replace PDU ?
How to replace RU and FU ?
How to replace RETU ?
How to replace ASC ?
How to do ASC checks and troubleshooting ?
How to use ASC Field Test Unit ?

49
Thank you !
Me @ wissam.yamout@ericsson.com
ewisyam
Any Questions ?

50

3G RBS overview and hardware guide

Recommended

Recommended

More Related Content

Similar to 3G RBS overview and hardware guide

Similar to 3G RBS overview and hardware guide (20)

More from Joe Osborn

More from Joe Osborn (20)

Recently uploaded

Recently uploaded (20)

3G RBS overview and hardware guide