BTS3900 GSM Technical Description

BTS3900 GSM

V300R009

Technical Description

Issue 05

Date 2010-03-15

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mailto:[email protected]

Contents

About This Document.....................................................................................................................1

1 Changes in BTS3900 GSM Technical Description..............................................................1-1

2 System Architecture of the BTS3900......................................................................................2-1

3 Logical Structure of the BTS3900............................................................................................3-1

4 BTS3900 Monitoring System....................................................................................................4-1

5 Reference Clocks of the BTS3900/BTS3900A........................................................................5-1

6 Signal Flow of the BTS3900/BTS3900A.................................................................................6-1

7 Topologies of the BTS...............................................................................................................7-1

8 Surge Protection Specifications of the BTS3900..................................................................8-1

9 Configuration of the BTS3900/BTS3900A.............................................................................9-19.1 BTS3900/BTS3900A Configuration Principles..............................................................................................9-29.2 RF Cable Connections of the DRFUs.............................................................................................................9-89.3 RF Cable Connections of the GRFUs...........................................................................................................9-199.4 RF Cable Connections for the Coexistence of the DRFUs and GRFUs.......................................................9-229.5 CPRI Cable Connections of the RFUs..........................................................................................................9-25

BTS3900 GSMTechnical Description Contents

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Figures

Figure 2-1 BTS3900 system.................................................................................................................................2-1Figure 3-1 Logical structure of the BTS3900......................................................................................................3-1Figure 4-1 Monitoring ports of the BBU..............................................................................................................4-1Figure 4-2 Components of the monitoring system...............................................................................................4-2Figure 6-1 DL traffic signal flow.........................................................................................................................6-1Figure 6-2 UL traffic signal flow.........................................................................................................................6-2Figure 6-3 Signaling flow.....................................................................................................................................6-3Figure 6-4 DL traffic signal flow.........................................................................................................................6-4Figure 6-5 UL traffic signal flow.........................................................................................................................6-5Figure 6-6 Signaling flow of signaling processing..............................................................................................6-6Figure 6-7 DL traffic signal flow.........................................................................................................................6-7Figure 6-8 UL traffic signal flow.........................................................................................................................6-8Figure 6-9 Signaling flow of signaling processing..............................................................................................6-9Figure 7-1 Star topology.......................................................................................................................................7-1Figure 7-2 Chain topology...................................................................................................................................7-1Figure 7-3 Tree topology......................................................................................................................................7-2Figure 7-4 Ring topology.....................................................................................................................................7-2Figure 7-5 Regrouping for disconnection in the ring topology............................................................................7-4Figure 7-6 Layer-2 networking topology.............................................................................................................7-4Figure 7-7 Layer-3 networking topology.............................................................................................................7-4Figure 7-8 Star topology.......................................................................................................................................7-5Figure 7-9 Chain topology...................................................................................................................................7-5Figure 7-10 Ring topology...................................................................................................................................7-5Figure 9-1 BBU slots............................................................................................................................................9-7Figure 9-2 Mapping between the RF cables and their colors...............................................................................9-8Figure 9-3 RF cable connections of S1 (Transmit Independency or Combining/transmit diversity)/S2 (TransmitIndependency or Combining)..............................................................................................................................9-10Figure 9-4 RF cable connections of the DRFU with Transmit Independency or Combining............................9-11Figure 9-5 RF cable connections of S2 (PBT)/S3 (Transmit Independency or Combining)/S4 (TransmitIndependency or Combining)..............................................................................................................................9-13Figure 9-6 RF cable connections of S3/3 configured with three DRFUs...........................................................9-14Figure 9-7 RF cable connections of S2 with 4-way RX diversity......................................................................9-15Figure 9-8 RF cable connections of S2 (transmit diversity)/S4 (transmit independency).................................9-16

BTS3900 GSMTechnical Description Figures


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Figure 9-9 RF cable connections of S5 (Transmit Independency or Combining)/S6 (Transmit Independency orCombining)..........................................................................................................................................................9-18Figure 9-10 RF cable connections of S7 (Transmit Independency or Combining)/S8 (Transmit Independency orCombining)..........................................................................................................................................................9-19Figure 9-11 Mapping between the RF signal cables and their colors................................................................9-19Figure 9-12 RF cable connections (1)................................................................................................................9-20Figure 9-13 RF cable connections (2)................................................................................................................9-21Figure 9-14 RF cable connections (3)................................................................................................................9-22Figure 9-15 Mapping between the RF cables and their colors...........................................................................9-22Figure 9-16 RF cable connections (1)................................................................................................................9-23Figure 9-17 RF cable connections (2)................................................................................................................9-24Figure 9-18 RF cable connections (3)................................................................................................................9-25Figure 9-19 Typical topology of the DRFUs.....................................................................................................9-26Figure 9-20 Typical topology of the GRFUs.....................................................................................................9-26

FiguresBTS3900 GSM


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Tables

Table 4-1 Monitoring modules of the BTS3900..................................................................................................4-2Table 4-2 Functions of the BTS3900 monitoring system.....................................................................................4-3Table 7-1 Comparison of topologies....................................................................................................................7-3Table 8-1 Surge protection specifications of the BTS3900..................................................................................8-1Table 9-1 RF configuration principles of the BTS3900.......................................................................................9-3Table 9-2 Board configuration principles of the BBU.........................................................................................9-8Table 9-3 Configuration description (1)...............................................................................................................9-9Table 9-4 Configuration description (2).............................................................................................................9-12Table 9-5 Configuration description (3).............................................................................................................9-13Table 9-6 Configuration description (4).............................................................................................................9-15Table 9-7 Configuration description (5).............................................................................................................9-17Table 9-8 Configuration description (6).............................................................................................................9-18Table 9-9 Typical configurations of the sending receiving mode......................................................................9-20Table 9-10 Two typical topologies.....................................................................................................................9-27

BTS3900 GSMTechnical Description Tables


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About This Document

PurposeThis document provides an overview of the BTS3900 GSM. It also describes the systemarchitecture, software and hardware structure, functional subsystems, configuration types, signalflow, clock synchronization modes, and topologies of the BTS3900 GSM.

Product VersionThe following table lists the product version related to this document.

Product Name Product Version

BTS3900 GSM (hereinafter referred to asBTS3900)

V300R009

Intended AudienceThis document is intended for:

l Network planners

l Field engineers

l System engineers

Organization1 Changes in BTS3900 GSM Technical Description

This provides the changes in the BTS3900 GSM Technical Description.

2 System Architecture of the BTS3900

The BTS3900 consists of the BBU3900, RFUs, and indoor macro cabinet. The BBU3900 andRFUs are installed in the indoor macro cabinet.

BTS3900 GSMTechnical Description About This Document


1

3 Logical Structure of the BTS3900

The BTS3900 mainly consists of the BBU and RFUs. The logical structure of the BTS3900consists of the RF subsystem, control subsystem, power subsystem, and antenna subsystem.

4 BTS3900 Monitoring System

The BTS3900 monitoring system enables the power monitoring, fan monitoring, andenvironment monitoring.

5 Reference Clocks of the BTS3900/BTS3900A

The BTS3900/BTS3900A supports four types of reference clocks: IP clock, line clock, free-runclock, and external clock.

6 Signal Flow of the BTS3900/BTS3900A

The signal flow of the BTS3900/BTS3900A consists of the traffic signal flow and the signalingflow of the BTS. The BTS3900/BTS3900A signal flow is classified into the DL traffic signalflow, UL traffic signal flow, and signaling flow. The BTS3900/BTS3900A supports three typesof transmission mode: TDM, HDLC, and IP. The following sections describe the signal flow ofthe BTS3900/BTS3900A in three transmission modes respectively.

7 Topologies of the BTS

The topologies of the BTS include the TDM networking, IP networking, and HDLC networking.In practice, these topologies can be combined. Optimum utilization of the topologies can improvethe quality of service and lower the investment on the transmission equipment.

8 Surge Protection Specifications of the BTS3900

The BTS3900 provides surge protection for its ports. The surge protection specifications of theBTS3900 ports consist of the DC or AC supply, antenna, transmission, and dry contact alarms.

9 Configuration of the BTS3900/BTS3900A

This describes the configuration principles of the BTS3900/BTS3900A, RF cable connections,and CPRI cable connections.

ConventionsSymbol Conventions

The symbols that may be found in this document are defined as follows.

Symbol Description

Indicates a hazard with a high level of risk, which if notavoided,will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, whichif not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if notavoided,could result in equipment damage, data loss,performance degradation, or unexpected results.

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Symbol Description

Indicates a tip that may help you solve a problem or savetime.

Provides additional information to emphasize or supplementimportant points of the main text.

General Conventions

The general conventions that may be found in this document are defined as follows.

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are inboldface. For example, log in as user root.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are inCourier New.

Command Conventions

The command conventions that may be found in this document are defined as follows.


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated byvertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated byvertical bars. One item is selected or no item is selected.

{ x | y | ... }* Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of allitems can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected.

GUI Conventions

The GUI conventions that may be found in this document are defined as follows.

BTS3900 GSMTechnical Description About This Document


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Boldface Buttons, menus, parameters, tabs, window, and dialog titlesare in boldface. For example, click OK.

> Multi-level menus are in boldface and separated by the ">"signs. For example, choose File > Create > Folder.

Keyboard Operations

The keyboard operations that may be found in this document are defined as follows.

Format Description

Key Press the key. For example, press Enter and press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A meansthe two keys should be pressed in turn.

Mouse Operations

The mouse operations that may be found in this document are defined as follows.

Action Description

Click Select and release the primary mouse button without movingthe pointer.

Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.

Drag Press and hold the primary mouse button and move thepointer to a certain position.

About This DocumentBTS3900 GSM


4 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

Issue 05 (2010-03-15)

1 Changes in BTS3900 GSM TechnicalDescription

This provides the changes in the BTS3900 GSM Technical Description.

05 (2010-03-15)This is the fourth commercial release.

Compared with issue 04 (2010-01-30), no part is added, modified or removed.

04 (2010-01-30)This is the third commercial release.

Compared with issue 03 (2009-12-30), no part is added, modified or removed.

03 (2009-12-30)This is the second commercial release.

02 (2009-09-30)This is the first commercial release.

01 (2009-07-15)This is the draft release.

BTS3900 GSMTechnical Description 1 Changes in BTS3900 GSM Technical Description


1-1

2 System Architecture of the BTS3900

The BTS3900 consists of the BBU3900, RFUs, and indoor macro cabinet. The BBU3900 andRFUs are installed in the indoor macro cabinet.

Figure 2-1 shows the BTS3900 system.

Figure 2-1 BTS3900 system

NOTE

The RFUs are of two types: DRFUs and GRFUs.

The BTS3900 mainly consists of the following components:

BTS3900 GSMTechnical Description 2 System Architecture of the BTS3900


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l The BBU3900 is used for baseband processing and enables interaction between the BTSand the BSC.

l The RFU is an RF filtering unit, which performs modulation, demodulation, dataprocessing, and combining and dividing for baseband and RF signals.

l The indoor macro cabinet houses the BBU3900 and RFUs. In addition, the indoor macrocabinet provides the functions such as power distribution, heat dissipation, and surgeprotection.

2 System Architecture of the BTS3900BTS3900 GSM


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3 Logical Structure of the BTS3900

The BTS3900 mainly consists of the BBU and RFUs. The logical structure of the BTS3900consists of the RF subsystem, control subsystem, power subsystem, and antenna subsystem.

Figure 3-1 shows the logical structure of the BTS3900.

Figure 3-1 Logical structure of the BTS3900

NOTE

l In Figure 3-1, the power subrack (DC/DC) is configured in only the +24 V DC cabinet; the powersubrack (AC/DC) is configured in only the 220 V AC cabinet.

l If the TMA is configured, the GATM and the Bias-Tee must be configured.

The logical subsystems of the BTS3900 are as follows:

BTS3900 GSMTechnical Description 3 Logical Structure of the BTS3900


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l RF subsystem, implemented by the RFUs

l Control subsystem whose functions are implemented by the BBU

l Power subsystem whose functions are implemented by the following modules:– DCDU–01 in the BTS3900 cabinet (-48 V DC)

– DCDU–01 and Power subrack (DC/DC) in the BTS3900 cabinet (+24 V DC)

– DCDU–01 and Power subrack (AC/DC) in the BTS3900 cabinet (220 V AC)

l Antenna subsystem whose functions are implemented by the following modules:– Antenna

– Bais-Tee

– GATM

– TMA

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4 BTS3900 Monitoring System

The BTS3900 monitoring system enables the power monitoring, fan monitoring, andenvironment monitoring.

BBU Monitoring PortsFigure 4-1 shows the monitoring ports of the BBU.

Figure 4-1 Monitoring ports of the BBU

l The BBU provides a maximum of two RS485 buses and 16 Boolean signals.

l The modules on RS485 bus 0 cannot be interchanged with the modules on RS485 bus 1.

l When two PMUs are configured, they cannot be connected to the same bus if the settingsof the DIP switches on the two PMUs are the same.

Components of the Monitoring SystemFigure 4-2 shows the components of the BTS3900 monitoring system.

BTS3900 GSMTechnical Description 4 BTS3900 Monitoring System


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Figure 4-2 Components of the monitoring system

NOTE

The RS485 bus 0 is indicated by bus0. The RS485 bus 1 is indicated by bus1.

Table 4-1 describes the monitoring modules of the BTS3900.

Table 4-1 Monitoring modules of the BTS3900

Module Address Bus Pin Description

PMU bus0 - Configured only inthe BTS3900 cabinet(220 V AC)

FAN1 bus0 - Mandatory

FAN2 bus0 - Configured whentwo cabinets arestacked

GATM2 bus0 - Optional

GATM1 bus1 - Optional

EMU bus1 - Optional

Power subrack (DC/DC)

Boolean Pin 3 and pin 6 Configured only inthe BTS3900 cabinet(+24 V DC)

Functions of the BTS3900 Monitoring System

Table 4-2 describes the functions of the BTS3900 monitoring system.

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Table 4-2 Functions of the BTS3900 monitoring system

Module Monitoring Function

FAN l Fan fault detection

l Adjusting rotation speed of the fans

l Detecting temperature and rotation speedof the fans

GATM Reporting the RET control alarm signals

EMU l Communicating with the centralprocessing unit through the two RS485ports

l Detecting the input voltage

l Providing the independent sensor port fordetecting humidity and temperature (12 VDC/24 V DC current type)

l Providing the port for detecting theBoolean input signals in dry contact modeand in OC mode

l Providing six external Boolean outputcontrol ports of the relay node type

PMU l Communicating with the centralprocessing unit through the RS232/RS422serial port

l Managing the power system and thebattery charging and discharging

l Detecting power distribution and reportingalarms

Power subrack (DC/DC) l Detecting module fault alarms(overvoltage output, no output, and fanfault)

l Detecting module protection alarms(overtemperature protection, andovervoltage and undervoltage protection)and AC power failure alarms

BTS3900 GSMTechnical Description 4 BTS3900 Monitoring System


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5 Reference Clocks of the BTS3900/BTS3900A

The BTS3900/BTS3900A supports four types of reference clocks: IP clock, line clock, free-runclock, and external clock.

IP ClockThe IP clock acts as the clock source of the BTS3900/BTS3900A, when the BTS uses the IPover FE transmission mode. The IP clock requires the configuration of the IP clock server in thenetwork. The IP clock server carries the reference clock information in the UDP data packet,and then transmits the clock packets to the BTS. The BTS then resolves the clocks signals fromthe clock packet and uses these signals as reference clock source.

Line ClockThe BBU3900 directly extracts the clock from the E1/T1 interface. Then, the BBU exports theprecise 2 MHz and 8 kHz clocks after frequency dividing, phase locking, and phase adjusting.The 2 MHz and 8 kHz clocks are used for bit synchronization and frame synchronization in theBTS. The line clock consists of the trace BSC clock and trace transmission clock. The BTSextracts the clock signals from the BSC through the E1/T1 interface and uses them as thereference clock source. When the transmission mode of the BTS is upgraded from E1/T1 modeto IP mode, if there is no IP clock, the BTS extracts the clock signals from the transmissionnetwork through the E1/T1 interface and use them as the reference clock source.

Free-Run ClockIn the absence of external clocks, the internal free-run clock ensures that the BTS keeps workingproperly for at least ninety days.

External ClockIf the BBU3900 is configured with the USCU, the USCU can receive the external clock signalsfor the GTMU. The USCU supports clock signals including the GPS clock signal, RGPS clocksignal, and BITS clock signal.

BTS3900 GSMTechnical Description 5 Reference Clocks of the BTS3900/BTS3900A


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6 Signal Flow of the BTS3900/BTS3900A

The signal flow of the BTS3900/BTS3900A consists of the traffic signal flow and the signalingflow of the BTS. The BTS3900/BTS3900A signal flow is classified into the DL traffic signalflow, UL traffic signal flow, and signaling flow. The BTS3900/BTS3900A supports three typesof transmission mode: TDM, HDLC, and IP. The following sections describe the signal flow ofthe BTS3900/BTS3900A in three transmission modes respectively.

TDM TransmissionDL Traffic Signal Flow

The DL traffic signal flow is transmitted from the BSC to the MS through the BTS3900/BTS3900A. In the BTS3900/BTS3900A, the BBU and RFUs work together to process the DLtraffic signals. Figure 6-1 shows the DL traffic signal flow.

Figure 6-1 DL traffic signal flow

DBUSCBUS

FHBUS

3

…

32

RFU

RFU

RFU

BBU MS1

RF signals

3

CPRIE1

BSC

Downlink traffic signal flow

RF signals

RF signals

The DL traffic signal flow is as follows:

1. The E1 signals from the BSC are transmitted to the BBU through the E1 cable.2. After receiving the E1 signals, the BBU processes the E1 signals as follows:

(1) Extracts clock signals from the E1 signals(2) Configures the BTS system based on the data configuration on the OML

BTS3900 GSMTechnical Description 6 Signal Flow of the BTS3900/BTS3900A


6-1

(3) Encapsulates the E1 data in the format of the CPRI frame, and then transmits the datato the RFU through the CPRI signal cable

3. After receiving the signals, the RFU processes them as follows:

(1) Decapsulates the high-speed CPRI frames to obtain the baseband signals(2) Transmits the baseband signals to the relevant operation units for encryption and

interleaving(3) Converts the digital signals into the analog signals and modulates the analog signals

into RF signals(4) Combines or divides the RF signals based on its own configuration(5) Transmits the combined or divided signals through the feeder and antenna

UL Traffic Signal Flow

Compared to the DL traffic signal flow, the UL traffic signal flow is transmitted from the MSto the BSC through the BTS3900/BTS3900A. In the BTS3900/BTS3900A, the BBU and RFUswork together to process the UL traffic signals. Figure 6-2 shows the UL traffic signal flow.

Figure 6-2 UL traffic signal flow

MS

DBUSCBUS

FHBUS

3

…

32

RFU

RFU

RFU

BBU1

RF signals

3

CPRIE1

BSC

Uplink traffic signal flow

RF signals

RF signals

The UL traffic signal flow is as follows:

1. The antenna receives the signals sent from the MS. If the TMA is configured, the receivedsignals are amplified by the TMA and then transmitted to the RFU through the feeder.

2. After receiving the UL signals, the RFU processes the signals as follows:

(1) Divides the UL signals from the antenna or diversity RX port(2) Converts the divided analog signals into the digital signals to obtain the baseband

signals(3) Transmits the baseband signals to the relevant operation units for decryption and de-

interleaving(4) Encapsulates the processed data in the format of the CPRI frame, and then transmits

the data to the BBU through the CPRI signal cable3. After receiving the signals, the BBU processes the signals as follows:

(1) Decapsulates the high-speed CPRI frames to obtain the baseband signals

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(2) Encapsulates the baseband signals in the format of the E1 frame, and then transmitsthe signals to the BSC through the E1 cable

Signaling Flow

The BTS3900/BTS3900A signaling flow refers to the signaling on the Abis interface. The BBUserves as the control unit and works with the RFUs to process the signaling. Figure 6-3 showsthe signaling flow.

Figure 6-3 Signaling flow…

RFU

RFU

RFU

BBUE1

BSC

DBUSCBUS

FHBUS

2 CPRI

Signaling flow

1

The signaling flow is as follows:

1. The signaling data received from the BSC is transmitted to the BBU through the Abisinterface.

2. The BBU encapsulates the signaling data in the format of the CPRI frame, and thentransmits the signaling data to the RFU through the CPRI signal cable.

3. The RFU decapsulates the CPRI signals into the baseband signals, and then transmits thebaseband signals to the relevant operation units for processing.

4. The RFU encapsulates the data of its own status in the format of the CPRI frame, and thentransmits the data to the BBU through the CPRI signal cable.

5. The BBU decapsulates the received CPRI signals to obtain the baseband signals.6. The BBU analyzes and processes the baseband signals to obtain the BTS status, and then

sends the status data to the BSC on the Abis interface.

HDLC TransmissionDL Traffic Signal Flow




6-3


DBUSCBUS

FHBUS

3

…

32

RFU

RFU

RFU

BBU MS1

RF signals

3

CPRIE1

BSC


RF signals

RF signals

HDLC Packet


1. The BSC encapsulates the service data in the format of the HDLC data packet, and thentransmits the data to the BBU through the E1 cable.

2. After receiving the E1 signals, the BBU processes the E1 signals as follows:

(1) Extracts the clock signals from the E1 signal(2) Resolves the data packet in the HDLC format from the E1 timeslot signals bound to

the HDLC channel, and then configures the BTS system based on the ESL and OMLdata resolved from the data packet

(3) Encapsulates the HDLC service data in the format of the CPRI frame, and thentransmits the data to the RFU through the CPRI signal cable

3. After receiving the signals, the RFU processes the signals as follows:

(1) Decapsulates the high-speed CPRI frames and HDLC packets to obtain the basebandsignals

(2) Transmits the baseband signals to the relevant operation units for encryption andinterleaving

(3) Converts the digital signals into the analog signals and modulates the analog signalsinto RF signals

(4) Combines or divides the RF signals based on its own configuration(5) Transmits the combined or divided signals through the feeder and antenna






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MS

DBUSCBUS

FHBUS

3

…

32

RFU

RFU

RFU

BBU1

RF signals

3

CPRIE1

BSC


RF signals

RF signals

HDLC Packet






interleaving(4) Encapsulates the processed signal in the format of the CPRI frame, and then transmits

the signal to the BBU through the CPRI signal cable3. After receiving the signals, the BBU processes the signals as follows:

(1) Decapsulates the high-speed CPRI frames to obtain the data in the format of the HDLCframe

(2) Finds the HDLC transmission channel corresponding to this HDLC data packet, andthen transmits the data in the format of the E1 frame to the BSC through the E1 cable

Signaling Flow

The BTS3900/BTS3900A signaling flow refers to the signaling on the Abis interface. The BBUserves as the control unit and works with the RFUs to process the signaling. Figure 6-6 showsthe signal flow of signaling processing.



6-5

Figure 6-6 Signaling flow of signaling processing

…

RFU

RFU

RFU

BBUE1

BSC

DBUSCBUS

FHBUS

2 CPRI

Signaling flow

1HDLC Packet


1. The BBU receives the signaling data from the BSC through the E1 cable.2. The BBU receives the relevant signaling data and processes the signaling data as required.3. The BBU encapsulates the signaling data to be processed by the RFU in the format of the

CPRI frame, and then transmits the signaling data to the RFU through the CPRI signalcable.

4. The RFU decapsulates the received CPRI signals and processes the signals as required.5. The RFU encapsulates the data of its own status in the format of the CPRI frame, and then

transmits the data to the BBU through the CPRI signal cable.6. The BBU decapsulates the received CPRI signals to obtain the data of the RFU status.7. The BBU analyzes and processes the baseband signals to obtain the BTS status, and then

sends the status data to the BSC on the Abis interface.

IP TransmissionDL Traffic Signal Flow





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DBUSCBUS

FHBUS

3

…

32

RFU

RFU

RFU

BBU MS1

RF signals

3

CPRIFE

BSC


RF signals

RF signals

UDP/IP Packet

HDLC Packet


1. The BSC encapsulates the service data in the UDP payload, and then transmits the IP packetto the BBU through FE transmission.

2. After receiving the IP packet, the BBU processes the packet as follows:

(1) If the current clock mode is configured to the IP clock, the clock packet is identifiedfrom the IP packet. The clock information is resolved from the clock packet for clocksynchronization.

(2) Identifies the packet on the ESL and OML and configures the BTS system based onthe resolved data.

(3) Identifies the service packet and deletes the UDP/IP header of the service packet.Encapsulates the service data in HDLC format and transmits the data to the RFU inthe format of the CPRI frame.

3. After receiving the signals, the RFU processes the signals as follows:

(1) Decapsulates the high-speed CPRI frames and HDLC packets to obtain the basebandsignals

(2) Transmits the baseband signals to the relevant operation units for encryption andinterleaving

(3) Converts the digital signals into the analog signals and modulates the analog signalsinto RF signals

(4) Combines or divides the RF signals based on its own configuration(5) Transmits the combined or divided signals through the feeder and antenna





6-7


MS

DBUSCBUS

FHBUS

3

…

32

RFU

RFU

RFU

BBU1

RF signals

3

CPRIFE

BSC


RF signals

RF signals

UDP/IP Packet

HDLC Packet






interleaving(4) Encapsulates the processed signal in the format of the HDLC frame and then in the

format of the CPRI frame, and then transmits the signal to the BBU through the CPRIsignal cable

3. After receiving the signals, the BBU processes the signals as follows:

(1) Decapsulates the high-speed CPRI frames to obtain the data in the format of the HDLCframe

(2) Obtains the UDP/IP header information corresponding to the HDLC data packet inthe configuration data, and then encapsulates the HDLC frame payload in the UDP/IP format. Then, the BBU checks the ARP table, finds the destination MAC address,encapsulates the packets in the MAC format, and transmits the packets to the BSCthrough FE transmission.

Signaling Flow

The BTS3900/BTS3900A signaling flow refers to the signaling on the Abis interface. The BBUserves as the control unit and works with the RFUs to process the signaling. Figure 6-9 showsthe signal flow of signaling processing.




Issue 05 (2010-03-15)

Figure 6-9 Signaling flow of signaling processing

…

RFU

RFU

RFU

BBUFE

BSC

DBUSCBUS

FHBUS

2 CPRI

Signaling flow

1UDP/IP Packet

HDLC Packet


1. The BBU receives the signaling data encapsulated in the UDP/IP format from the BSCthrough FE transmission.

2. After decapsulating the signaling data, the BBU receives the relevant signaling data andprocesses the data as required.

3. The BBU encapsulates the signaling data to be processed by the RFU in the format of theCPRI frame, and then transmits the signaling data to the RFU through the CPRI signalcable.

4. The RFU decapsulates the received CPRI signals and processes the signals as required.5. The RFU encapsulates the data of its own status in the format of the CPRI frame, and then

transmits the data to the BBU through the CPRI signal cable.6. The BBU decapsulates the received CPRI signals to obtain the data of the RFU status.7. The BBU analyzes and processes the baseband signals to obtain the BTS status, and then

sends the status data encapsulated in the UDP/IP format to the BSC through FEtransmission.



6-9

7 Topologies of the BTS

The topologies of the BTS include the TDM networking, IP networking, and HDLC networking.In practice, these topologies can be combined. Optimum utilization of the topologies can improvethe quality of service and lower the investment on the transmission equipment.

TDM NetworkingThe E1/T1 transmission is used between the BSC and the BTS, and the TDM transmission isused on the Abis interface. The TDM networking can be classified into the star topology, chaintopology, tree topology, and ring topology.

Figure 7-1 shows the star topology.

Figure 7-1 Star topology

Figure 7-2 shows the chain topology.

Figure 7-2 Chain topology

BSC BTS BTS BTS

BTS3900 GSMTechnical Description 7 Topologies of the BTS


7-1

Figure 7-3 shows the tree topology.

Figure 7-3 Tree topology

BSC

BTS

BTS

BTS

BTS

Figure 7-4 shows the ring topology.

Figure 7-4 Ring topology

Table 7-1 compares the topologies.

7 Topologies of the BTSBTS3900 GSM



Issue 05 (2010-03-15)

Table 7-1 Comparison of topologies

Topology Application Scenario Advantage

Star topology Applies to common areas,especially densely populatedareas, such as cities.

l Simple networking

l Easy engineering construction

l Convenient maintenance

l Flexible capacity expansion

l High network reliability

Chain topology Applies to sparsely populatedareas in strip-like terrain, suchas areas along highways andrailway tracks.

Reduces costs in transmissionequipment, construction, andtransmission link lease.

Tree topology Applies to areas wherenetwork structures, sitedistribution, and subscriberdistribution are complicated,for example, an area wherelarge-scale coverage overlapshot spot or small-scalecoverage.

Requires fewer transmission cablescompared with the star topology.

Ring topology Applies to common scenarios.Due to its strong self-healingcapability, the ring topologyis preferred, if permitted bythe routing.

If there is a breaking point in the ring,the ring breaks into two chains at thebreaking point automatically. In thisway, the BTSs preceding and followingthe breaking point can work normallydespite the breaking point, thusimproving the robustness of the system.For example, BTS0, BTS1, and BTS2are sequentially connected to form a ring(clockwise). When a failure occurs at B,BTS0, the BTS topology preceding B,remains unchanged, and BTS2 andBTS1, the BTSs following B form achain (anticlockwise), as shown inFigure 7-5.



7-3

Figure 7-5 Regrouping for disconnection in the ring topology

IP NetworkingThe FE transmission is used between the BSC and the BTS, and the IP transmission is used onthe Abis interface. The IP networking consists of the layer-2 networking topology and layer-3networking topology.

Figure 7-6 shows the layer-2 networking topology.

Figure 7-6 Layer-2 networking topology

BTS

Switch

BSC

BTS

Layer2 NetworkSwitch

Switch

Figure 7-7 shows the layer-3 networking topology.

Figure 7-7 Layer-3 networking topology

Router

BTS

BSC

Router

BTS

IP Network

Router




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HDLC Networking

The E1/T1 transmission is used between the BSC and the BTS, and the HDLC transmission isused on the Abis interface. The HDLC networking can be classified into the star topology, chaintopology, and ring topology.

Figure 7-8 shows the star topology.

Figure 7-8 Star topology

Figure 7-9 shows the chain topology. The upper-level BTS transparently transmits the signalsof the lower-level BTS.

Figure 7-9 Chain topology

BSC BTS BTS BTS

Figure 7-10 shows the ring topology.

Figure 7-10 Ring topology



7-5




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8 Surge Protection Specifications of theBTS3900

The BTS3900 provides surge protection for its ports. The surge protection specifications of theBTS3900 ports consist of the DC or AC supply, antenna, transmission, and dry contact alarms.

NOTE

The unspecified surge current with maximum discharge current is called nominal discharge current.

Table 8-1 Surge protection specifications of the BTS3900

Port Surge Protection Mode Surge Current

DC power port Differential mode 10 kA (8/20 us surge current)

Common mode 15 kA (8/20 us surge current)

AC power port Differential mode 60 kA (8/20 us surge current)


Antenna port Differential mode 8 kA (8/20 us surge current)


Dry contact port,RS485 port

Differential mode 250 A (8/20 us surge current)

Common mode 250 A (8/20 us surge current)

E1/T1 port Differential mode 3 kA (8/20 us surge current)


RET antenna Differential mode 3 kA (8/20 us surge current)


BTS3900 GSMTechnical Description 8 Surge Protection Specifications of the BTS3900


8-1

9 Configuration of the BTS3900/BTS3900A

About This Chapter

This describes the configuration principles of the BTS3900/BTS3900A, RF cable connections,and CPRI cable connections.

9.1 BTS3900/BTS3900A Configuration PrinciplesThe BTS3900/BTS3900A is configured with the antenna system, RFUs, and BBU.

9.2 RF Cable Connections of the DRFUsOne end of the RF jumper is connected to the RF port on the DRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

9.3 RF Cable Connections of the GRFUsOne end of the RF jumper is connected to the RF port on the GRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

9.4 RF Cable Connections for the Coexistence of the DRFUs and GRFUsOne end of the RF jumper is connected to the RF port on the RFU, and the other end is connectedto the feeder. You can determine the appropriate RF ports based on the actual networking modes.

9.5 CPRI Cable Connections of the RFUsThe RFUs support two types of topology: star and chain.

BTS3900 GSMTechnical Description 9 Configuration of the BTS3900/BTS3900A


9-1

9.1 BTS3900/BTS3900A Configuration PrinciplesThe BTS3900/BTS3900A is configured with the antenna system, RFUs, and BBU.

Basic Configuration Principlesl If multiple hardware configurations meet the requirements for the RNP parameter settings,

the configuration mode that supports smooth upgrades is preferred.l The DRFU is applicable to small- and middle-capacity scenarios; the GRFU is applicable

to large-capacity scenarios. The DRFU and GRFU can be configured in the same cabinetor cell to support flexible capacity expansion.

l Wide coverage is preferred. The DRFU supports the PBT, TX diversity, and 4-way RXdiversity mode. Therefore, the DRFU can be applied to wide-coverage scenarios.

Antenna Configuration Principlesl One dual-polarized antenna can serve a maximum of two RFUs.

l By default, RX diversity is adopted on the GSM network. That is, two feeders connectedto two single-polarized antennas or one dual-polarized antenna must be configured in acell.

l Each sector of the BTS must be configured with the minimum number of antennas.

l For the 2-way RX diversity, each sector has two antenna channels; for the 4-way RXdiversity, each sector has four antenna channels.

RF Configuration PrinciplesTable 9-1 describes the RF configuration principles of the BTS3900.

9 Configuration of the BTS3900/BTS3900ABTS3900 GSM



Issue 05 (2010-03-15)

Table 9-1 RF configuration principles of the BTS3900

Principle Description Example

Configuration principles ofthe DRFU ports

l ANT1 and ANT2 are theTX ports of the duplexer.They are connected tojumpers.

l Rx1 in, Rx1 out, Rx2 in,and Rx2 out are the portsfor signals betweeninterconnected DRFUs.When two carriersprovided by a DRFUbelong to the same cell,both Rx1 in and Rx2 in canbe the input ports for RXdiversity of the twocarriers. When twocarriers provided by aDRFU belong to differentcells, Rx1 in is the inputport for RX diversity ofcarrier 1; Rx2 in is theinput port for RX diversityof carrier 2.

l CPRI_0 and CPRI_1 arethe ports for high-speedelectrical cables. TheCPRI_1 port is connectedto the CPRI port on theBBU or to the upper-levelRFU in the case ofcascaded RFUs. TheCPRI_0 port is connectedto the lower-level RFU inthe case of cascadedRFUs.

In S3/3 configuration, threeDRFUs need to beconfigured. The carriersprovided by the middleDRFU belong to differentcells. That is, the Rx1 in porton the middle DRFU is theinput port for RX diversity ofcarrier 1, which belongs tothe first cell. The input portfor RX main of carrier 1 isANT1. The Rx2 in port is theinput port for RX diversity ofcarrier 2, which belongs tothe second cell. The inputport for RX main of carrier 2is ANT2.



9-3


Configuration principles ofthe GRFU ports

l The ANT_TX/RXA portsupports signal receptionand transmission, and theANT_RXB port supportssignal reception. They areconnected to jumpers.

l RX_INB and RX_OUTAare the ports for signalsbetween interconnectedGRFUs.

l CPRI_0 and CPRI_1 arethe ports for high-speedelectrical cables. TheCPRI_0 port is connectedto the CPRI port on theBBU or to the upper-levelRFU in the case ofcascaded RFUs. TheCPRI_1 port is connectedto the lower-level RFU inthe case of cascadedRFUs.

-

Configuration principles of asingle cabinet

l Star topology is adoptedbetween the BBU andRFUs. The RFUs and thehigh-speed CPRI ports onthe BBU have a one-to-one relationship. That is, ifslot 1 on the RFU is idle,CPRI port 1 on the BBU isalso idle.

l When the DRFU isconfigured, the maximumcell configuration of asingle cabinet is S4/4/4.When the GRFU isconfigured, the maximumcell configuration of asingle cabinet isS12/12/12.

-

Configuration principles ofmultiple cabinets

When star and chaintopology is adopted betweenthe BBU and RFUs, the RFUsupports 3 levels ofcascading in a chain and thusthe BBU supports amaximum of 18 (6 x 3) RFUs.

-




Issue 05 (2010-03-15)


Two TRXs of one DRFUconfigured in one sector

l A single DRFU does notsupport the S1/1application; however,three DRFUs support theS3/3 application.

l When the DRFU works inTX PBT, TX diversity, or4-way RX diversity mode,a DRFU provides only oneTRX. Therefore, you canconfigure the DRFU asrequired.

For example, for a site inS5/4/7 cell configuration,nine DRFUs are installed tomeet the requirements ofS6/4/8 cell configuration, butdata configuration is stillperformed on the basis of theS5/4/7 cell configuration.

Number of DRFUs l When the number of TRXsof the site is less than 12,an odd number of TRXscan be configured for acell. Number of DRFUs =round up [(number ofTRXs + number of S1cells) / 2]

l When the number of TRXsof the site is greater than12, an even number ofTRXs should beconfigured for a cell.Number of DRFUs =round up (number ofTRXs after two TRXs areconfigured in one sector /2)

l S3/3/3: Number ofDRFUs = round up (9 / 2)= 5; S1/2/3: Number ofDRFUs = round up [(6 +1) / 2] = 4.

l After two TRXs areconfigured in one sector,the S5/5/5 configuration isS6/6/6. Number of DRFUs= (6 + 6 + 6) / 2 = 9.

Number of GRFUs One GRFU does not servetwo cells. Each cell with asingle antenna can beconfigured with a maximumof two GRFUs.

-

DRFU TRX allocation indouble-antenna-systemmode

After TRX allocation, thecells with an odd number ofTRXs become neighboringcells of each other.l S5 = S3 + S2 or S5 = S2 +

S3l S6 = S4 + S2 or S6 = S3 +

S3l S7 = S4 + S3 or S7 = S3 +

S4l S8 = S4 + S4

l In S3/5/4 configuration,S5 can be divided into S3+ S2. Then, the cellconfiguration becomesS3/(3/2)/4.

l In S2/5/5 configuration,the first S5 is divided intoS2 + S3; the second S5 isdivided into S3 + S2.Then, the cellconfiguration becomesS2/(2/3)/(3/2).



9-5


DRFUs at two bandsconfigured in a site

l If the number of DRFUs isnot more than six in adouble-band site, theDRFUs at two bands areconfigured in the samecabinet. If the RF cabinetis configured with lessthan three 900 MHzDRFUs and three 1800MHz DRFUs, the 900MHz DRFUs are installedin of the three slots on theleft of the RF cabinet, andthe 1800 MHz DRFUs areinstalled in the three slotson the right of the RFcabinet.

l When two RF cabinets areconfigured and thenumber of DRFUs at eachband is not more than six,the 900 MHz DRFUs areinstalled in the first RFcabinet and the 1800 MHzDRFUs are installed in thesecond RF cabinet. TheDRFUs are installed in theslots according to thetypical S4/4/4configuration. When twoRF cabinets areconfigured and thenumber of DRFUs at oneband (for example, 900MHz) is greater than six,other DRFUs at this bandshare the other RF cabinetwith the DRFUs at theother band (for example,1800 MHz). The mixedconfiguration of DRFUs attwo bands is not allowed.

-




Issue 05 (2010-03-15)


Coexistence configurationprinciples of the DRFUs andGRFUs

Coexistence configurationprinciples of the DRFUs andGRFUs are as follows:l The primary BCCH is

carried on a GRFU.l When the requirements of

the output power andnumber of carriers are metand the cell configurationis greater than S4, a singleDRFU is configured withone TRX; when twoDRFUs are configured,one DRFU is preferablyused.

l The TX power of a DRFUand that of a GRFU withina cell are almost the same.The power differenceshould not exceed 0.5 dB.

l When the DRFUs andGRFUs are configured inone cell, 4-way RXdiversity and TX diversityare not supported.

l The DRFUs and GRFUsare not recommended inthe same new site.

-

NOTE

In the mode of configuring two TRXs in one sector, a DRFU belongs to only one sector.

BBU Configuration Principlesl A BBU has six CPRI ports and supports a maximum of 72 carriers.

l Figure 9-1 shows the BBU slots.

Figure 9-1 BBU slots

012

56

FANUPEU/UEIU

UPEU3

4

7

l Table 9-2 describes the board configuration principles of the BBU.



9-7

Table 9-2 Board configuration principles of the BBU

Module or Board Description

UBFA One UBFA must be configured.

UPEU l One UPEU must be configured.

l A second UPEU can be configured whenthe backup power is required. The BBU,however, cannot be configured with theUPEU and the UEIU at the same time.

UEIU The UEIU is optional and a maximum ofone UEIU can be configured.

GTMU l One GTMU must be configured.

l Can be installed only in the slot 6(inhabited in Slot5 and Slot6).

UELP l Not required in the BTS3900

l One UELP must be configured in theBTS3900A. The UELP is installed inslot 1.

USCU l The USCU is optional and a maximumof one USCU can be configured.

l The USCU is installed in slot 0.

9.2 RF Cable Connections of the DRFUsOne end of the RF jumper is connected to the RF port on the DRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

RF Cable Connectionsl The TX/RX mode and Sending Receiving Mode described in the following list are set on

the BSC side.

l The RF cables differ from each other in colors. Figure 9-2 shows the mapping between theRF signal cables and their colors.

Figure 9-2 Mapping between the RF cables and their colors

RF jumper between the cascaded RFUs

RF jumper

CPRI signal cable




Issue 05 (2010-03-15)

S1 with Transmit Independency or Combining, S1 with Transmit Diversity, andS2 with Transmit Independency or Combining

The S1 with Transmit Independency or Combining, S1 with transmit diversity, and S2 withTransmit Independency or Combining use the configuration of one DRFU and one dual-polarized antenna. Table 9-3 describes the related configurations.

Table 9-3 Configuration description (1)

NetworkingConfiguration

Transmit mode SendingReceiving Mode

HardwareConfiguration

S1, TransmitIndependency orCombining

TransmitIndependency orCombining

Double Feeder(2TX + 2RX)

l One DRFUl One dual-

polarized antenna

S1, TransmitDiversity

Transmit Diversity Double Feeder(2TX + 2RX)




Figure 9-3 shows cable connections.



9-9

Figure 9-3 RF cable connections of S1 (Transmit Independency or Combining/transmitdiversity)/S2 (Transmit Independency or Combining)

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX

ETH FE0 FE1 USB E1/T1 RS T

EX T-ALM1 EX T-ALM0

PWR

MON0MON1

EX T-ALM1 EX T -ALM0 MON0MON1UPEU

LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX

TX3 RX3 TX4 RX4 TX5 RX5

ANT

The other available Sending Receiving Mode for the DRFU with Transmit Independency orCombining are Single Feeder (1TX + 1RX), Double Feeder (1TX + 1RX), and Double Feeder(1TX + 2RX). The transmit mode is Transmit Independency or Combining. Figure 9-4 showscable connections.




Issue 05 (2010-03-15)

Figure 9-4 RF cable connections of the DRFU with Transmit Independency or Combining

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OU T

RX2/IN

RX2/OU T

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX

ETH FE0 FE1 USB E1/T1RS T

EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T -ALM0

PWR

MON0MON1

EX T-ALM1 EX T-ALM0 MON0MON1UPEU

LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX

TX3 RX3 TX4 RX4 TX5 RX5GTMU

TX0 RX0CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

TX/RX TX RX

ANT

TX/RX RX

ANT ANT

ANT ANT

Single Feeder (1TX + 1RX) Double Feeder (1TX + 1RX)

Double Feeder (1TX + 2RX)



9-11

S2 with PBT, S3 with Transmit Independency or Combining, and S4 with TransmitIndependency or Combining

The S2 with PBT, S3 with Transmit Independency or Combining, and S4 with TransmitIndependency or Combining use the configuration of two DRFUs and one dual-polarizedantenna. Table 9-4 describes the related configurations.





S2, PBT PBT Single Feeder (1TX+ 2RX)

l Two DRFUsl One dual-

polarized antennaS3, TransmitIndependency orCombining


Single Feeder (1TX+ 2RX)








Issue 05 (2010-03-15)

Figure 9-5 RF cable connections of S2 (PBT)/S3 (Transmit Independency or Combining)/S4(Transmit Independency or Combining)

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT

The S3/3 with Transmit Independency or Combining uses three DRFUs and two dual-polarizedantennas. Table 9-5 describes the related configurations.





S3/3, TransmitIndependency orCombining


l DRFU0: SingleFeeder (1TX +2RX)

l DRFU1: DoubleFeeder (2TX +4RX)


l Three DRFUs

l Two dual-polarizedantennas




9-13

Figure 9-6 RF cable connections of S3/3 configured with three DRFUs

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0 CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

S2 with 4-Way RX DiversityThe S2 with 4-way RX diversity uses two DRFUs and two dual-polarized antennas. The typicalconfigurations are as follows:

l Set the receive mode to 4-Way Receive Diversity.

l Set the sending receiving mode to Double Feeder (2TX + 4RX).





Issue 05 (2010-03-15)

Figure 9-7 RF cable connections of S2 with 4-way RX diversity

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

S2 with Transmit Diversity and S4 with Transmit Independency

The S2 with transmit diversity and S4 with transmit independency use the configuration of twoDRFUs and two dual-polarized antennas. Table 9-6 describes the related configurations.





S2, TransmitDiversity

Transmit Diversity Double Feeder(2TX + 2RX)

l Two DRFUsl Two dual-

polarizedantennas

S4, TransmitIndependency






9-15

Figure 9-8 RF cable connections of S2 (transmit diversity)/S4 (transmit independency)

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

S5 with Transmit Independency or Combining and S6 with TransmitIndependency or Combining

The S5 with Transmit Independency or Combining and S6 with Transmit Independency orCombining use the configuration of three DRFUs and two dual-polarized antennas. Table 9-7describes the related configurations.




Issue 05 (2010-03-15)










l Three DRFUs

l Two dual-polarizedantennas









9-17

Figure 9-9 RF cable connections of S5 (Transmit Independency or Combining)/S6 (TransmitIndependency or Combining)

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

S7 with Transmit Independency or Combining and S8 with TransmitIndependency or Combining

The S7 with Transmit Independency or Combining and S8 with Transmit Independency orCombining use the configuration of four DRFUs and two dual-polarized antennas. Table 9-8describes the related configurations.








l Four DRFUsl Two dual-

polarizedantennasS8, Transmit

Independency orCombining






Issue 05 (2010-03-15)


Figure 9-10 RF cable connections of S7 (Transmit Independency or Combining)/S8 (TransmitIndependency or Combining)

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

9.3 RF Cable Connections of the GRFUsOne end of the RF jumper is connected to the RF port on the GRFU, and the other end isconnected to the feeder. You can determine the appropriate RF ports based on the actualnetworking modes.

RF Cable ConnectionsThe RF cables differ from each other in colors. Figure 9-11 shows the mapping between the RFsignal cables and their colors.

Figure 9-11 Mapping between the RF signal cables and their colors


RF jumper

CPRI signal cable



9-19

The Sending Receiving Mode of the GRFU is set on the BSC side. Table 9-9 describes thetypical configurations of the Sending Receiving Mode for the GRFU.

Table 9-9 Typical configurations of the sending receiving mode

GRFU Configuration Sending Receiving Mode

Single module Double Feeder (1TX + 2RX)

Two interconnected modules Single Feeder (1TX + 2RX)

The other available Sending Receiving Mode for the GRFU are Single Feeder (1TX + 1RX)and Double Feeder (1TX + 1RX). Figure 9-12 shows cable connections.

Figure 9-12 RF cable connections (1)

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


TX0 RX0CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

TX RXTX/RX

ANT ANT ANT

Double Feeder (1TX + 1RX)Single Feeder (1TX + 1RX)

ANT_TX/RXA ANT_TX/RXA

Cell Configuration with a Single GRFUWhen a dual-polarized antenna is configured, one TX channel and two RX channels are used.The ANT_RXB and ANT_TX/RXA ports receive the signals from the antenna to achieve RXdiversity.




Issue 05 (2010-03-15)



GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT

ANT_TX/RXA

Cell Configuration with Two GRFUsThe ANT_TX/RXA port on each GRFU supports the receiving and transmitting of signals. TwoGRFUs provide RX signals for each other through the RF interconnection ports. Thus, the RXdiversity is implemented.




9-21


GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT

ANT_TX/RXAANT_TX/RXA

9.4 RF Cable Connections for the Coexistence of the DRFUsand GRFUs

One end of the RF jumper is connected to the RF port on the RFU, and the other end is connectedto the feeder. You can determine the appropriate RF ports based on the actual networking modes.

RF Cable ConnectionsThe RF cables differ from each other in colors. Figure 9-15 shows the mapping between the RFsignal cables and their colors.

Figure 9-15 Mapping between the RF cables and their colors


RF jumper

CPRI signal cable




Issue 05 (2010-03-15)

Single Antenna System Configured With One DRFU and One GRFUWhen a DRFU and a GRFU share a dual-polarized antenna, the typical configuration of theSending Receiving Mode for the DRFU and GRFU is as follows:

l The DRFU is configured with Single Feeder (1TX + 2RX).

l The GRFU is configured with Single Feeder (1TX + 2RX).



GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT

Double Antenna Systems Configured with One DRFU and One GRFUWhen a DRFU and a GRFU share two dual-polarized antennas, the typical configuration of theSending Receiving Mode for the DRFU and GRFU is as follows:

l The DRFU is configured with Double Feeder (2TX + 2RX).



9-23

l The GRFU is configured with Double Feeder (1TX + 2RX).



RX1/IN

ANT1

PWR

RX1/OU T

RX2/IN

RX2/OU T

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

Double Antenna Systems Configured with Two DRFUs and One GRFU

When two DRFUs and a GRFU share two dual-polarized antennas, the typical configuration ofthe Sending Receiving Mode for the DRFUs and GRFU is as follows:

l The DRFUs are configured with Single Feeder (1TX + 2RX).

l The GRFU is configured with Double Feeder (1TX + 2RX).





Issue 05 (2010-03-15)


GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT ANT

9.5 CPRI Cable Connections of the RFUsThe RFUs support two types of topology: star and chain.

Figure 9-19 shows the typical topology of the DRFUs.



9-25

Figure 9-19 Typical topology of the DRFUs

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

RX1/IN

ANT1

PWR

RX1/OUT

RX2/IN

RX2/OUT

CPRI_1

CPRI_0

ANT2

RUN ALM

RS T

VSWR

CPRI1CPRI0

AC T

GTMUTX0 RX0

CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX



PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


TX0 RX0CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


Chain connection Star connection

Figure 9-20 shows the typical topology of the GRFUs.

Figure 9-20 Typical topology of the GRFUs

GTMUTX0 RX0 CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


TX0 RX0 CPRI0

CPRI1

CPRI2

CPRI3

CPRI4

CPRI5

TX1 RX1 TX2 RX2

TX


EX T-ALM1 EX T-ALM0

PWR

MON0MON1


LIU0

LIU1

LIU2

LIU3

RUN

RUN

ALMACT

TS T

RX


ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

Chain connection

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

ANT_RXB

RX_INB

RX_OUTA

RUN

AC T

CPRI0

PWR

ALM

VSWR

CPRI1

CPRI1

MON

CPRI0

Star connectionANT_TX/RXA ANT_TX/RXA ANT_TX/RXA ANT_TX/RXA ANT_TX/RXA ANT_TX/RXA

NOTE

When the chain topology is used, a maximum of three levels of RFUs can be connected to one BBU.




Issue 05 (2010-03-15)

Table 9-10 describes the twotypical topologies.

Table 9-10 Two typical topologies

Topology Application Scenario

Star Supports the minimum configurationscenarios

Chain Supports the maximum configurationscenarios



9-27

Documents

BTS3900 GSM Technical Description