OMD1100 BTS312 Hardware Structure ISSUE2_0

7/29/2019 OMD1100 BTS312 Hardware Structure ISSUE2_0

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OMD1100

BTS312 Hardware StructureISSUE 2.0

OMD1100

BTS312 Hardware StructureISSUE 2.0

Wireless Training Department

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Contents

Part 2: Basic Operational

Principle of BTS

Part 1: Overview

Part3: Antenna Feeder

system

Part 4: Assistant System



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General introduction to BTS312

Part1: Overview



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MSC: Mobile Switching Center BSC: Base Station Controller SMC: Short Message Center

HLR: Home Location Register BTS: Base Transceiver Station VM: Voice Mailbox

AUC: AUthentication Center MS: Mobile Station OMC: Operation/Maintenance Center

VLR: Visitor Location Register EIR: Equipment Identify Register

Other MSC/VLR

MAP

M900 BTS

M900 BTS SMC&VMOMC

M900/M1800 BSC

TUP, ISUP

MAP

A interface

X.25/ LANX.25/ LAN

MSHLR/AUC/EIR

M900/M1800 MSC/VLR

M1800 BTS

M900 BTS

PSTNISDNPSPDN

Um interface

MS

Features and Function



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Features and Function

High integration and low power consumption

15 radio carriers at the Abis sharing an E1 for

transmission (15:1)

Integrating optical transmission equipment,implementing optical fiber to BTS

Supporting the configuration of up to S24/24/24

and facilitating expansion

1-minute fast startup



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Dual-Band frequency systems

Supporting short message cell broadcast

and point to point short message

GSM PHASE I/PHASE II and GPRS

Supporting baseband hopping

and RF hopping

Supporting the EFR and DTX

Supporting A5 encryption and decryption

Features and Functions



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FAN BOX

SWITCH BOX

FAN BOX

AIR BOX

AIR BOX

P

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Common

equipment

TRXCDU

air/fan

BTS312 Cabinet and Boards:

CDU: combiner & divider unit

TRX: transceiver module

PMU: power monitoring unit

TMU: Timing/Transmission &

Management Unit

PSU: power supply unit

TES: transmission extension

power supply unit

TEU: transmission extension unit

TDU: time distribution unit

BTS312 Cabinet and Boards



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Hardware structure of BTS312

DATA BUS/CONTROL_BUS/TIMING_BUS

Externalcontrol

Externalalarm

E1TMU

Opt. fiber

xDSL CDU

PMU

FH_BUS

CDU

PSU

TRX

TRX

TRX

TRX unitCommon unit

CDU

CDU

To antenna

To antenna

To antenna

Antenna feeder unit



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Operational Principle of BTS312

Part2:

Basic Operational

Principle of BTS



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BTS Logical Structure

DATA BUS/CONTROL_BUS/TIMING_BUS

Externalcontrol

Externalalarm

E1TMU

xDSL CDU

PMU

FH_BUS

CDU

PSU

TRX

TRX

TRX

TRX unitCommon unit

CDU

CDU

To antenna

To antenna

To antenna

Antenna feeder unit



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TMU

BSC

External synchronous clock

MMI man-

machineinterface

External

Alarming

control

BIU

OMU

EAC MCK

Standby MCK

Extended BIU

DBUS Internal data bus

CBUS Internal control bus

TDUInternal

clock bus

qFunction:

Timing

Transmission

Management



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BSC

External synchronous clock

MMI man-

machineinterface

External

Alarming

control

BIU

OMU

EAC MCK

Standby MCK

Extended BIU

DBUS Internal data bus

TDUInternal

clock bus

CBUS Internal control bus

Interfaces of TMU



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Panel of TMU



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TRX Module Structure

DBUS

TIMING_BUS

SCP CUI

Clock processing part

TBPU

DSP

FH_BUS

TDP PAU

RCU

send Main

RPU

receiver

Diversity

receiver



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Power amplifier unit (PAU) (output 46dBm/APC)

Over standing wave alarm: Over-temperature alarm:

Function of TRX



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DBUS

TIMING_BUS

SCP CUI

Clock processing part

TBPU

DSP

FH_BUS

TDP PAU

RCU

send Main

RPU

receiver

Diversity

receiver

Interface of TRX



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Please press button to continue your study.

Panel of TRX



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Tran

sceiver

Combin

er&

dividerunit

Lightning

arrester

Lightnin

g

arrester

TTA(optional)

TTA(optional)

CDU and Antenna System

Transceiving

antenna

Diverse

Receiving

antenna

Part 3 Antenna-feeder System



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Combiner

Distributor

Distributor

CouplerTX1

TX2

TX-COMBTX-DUP

RX1RX2RX3RX4

HL-out

RX2RX3RX4

RX1

HL-in

RXD

TX/RX-ANT

RXD-out

CDU



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Standing wave testing function:

When the tested standing wave exceeds the preset

threshold (1.5:1 or 2.5:1), CDU will givecorresponding alarms and indications.

Testing the internal amplifier and the tower amplifier,CDU reports the alarms to TMU.

Alarm Test



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Tx_Comb

TX4

TX3

TX2

TX1

3dBBridge

3dB

Bridge

3dB

Bridge

Four carriers are combined and output through 3dB

bridges and the plug loss is 6.8dB.

SCU



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Antenna gain

Antenna Pattern

Polarization

Diversity technology

Antenna Technology



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Antenna gain indicates the antenna feature of radiating

electromagnetic waves in specific directions.

Normally, the higher the gain, the stronger the far field strength.

A

B

GainA>GainB

Antenna gain



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The antenna pattern describes the radiating abilities ofantennas in all directions.

In the field of communication, this normally refers to the

horizontal pattern.

360Omni Antenna

120 90 65 Directional antenna

Antenna Pattern



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Two types of polarization:

Vertical polarization

Horizontal polarization

The types of antenna divided

by polarization:

Single polarization antenna

-Vertical polarization for GSM

-One port for one feeder

Bi-polarization antenna

+45 degree and -45 degree

Two ports for two feeders

Polarization



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Polarization diversitySave antenna

Space diversityd>10 x wavelength

Frequency diversity

Frequency hopping

Types of

diversity:

Diversity technology



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There are several forms for the main feeder:

7/8 inch

CABLE LOSS=0.043dB/m

5/4 inch

CABLE LOSS=0.032dB/m

1/2-inch super-flexible jumpers

CABLE LOSS=0.11dB/m

Used between the antenna and the main feeder

Between the antenna and the booster

Between the cabinet and the lightning arrester

Feeder



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BSC

BSC

BSC

TDU

TDU

TDU

TMU

TMU

TMU

DBUS

TBUS

CBUS

TRX

TRX

TRX

CDU Antenna

Traffic signaling

Clock signaling

Control signaling

Process of BTS



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Function:TimeDistributing Unit

Providing clock channels

in one synchronous cell

Transferring the E1 signals

in the local cabinet

Providing alarming channels

Bus connection

TDU



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Extension cabinet Extension cabinet

Extension cabinet group

Basic cabinet Basic cabinet

Basic cabinet group

Clock bus connection in a synchronous cell

Cabinet connection



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Three modes for BTS312 power supply:

Used for the AC power supply cabinet, with

the AC/DC module and batteries attached;220VAC

Used for the DC power supply cabinet with

the DC/DC module and no battery;-48VAC

Used for the DC power supply cabinet, with no

AC/DC module or DC/DC module, nor any battery;+24VAC

Power Supply



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AC/DC

(DC/DC)module

AC/DC

(DC/DC)module

AC/DC

(DC/DC)module

AC/DC

(DC/DC)module

Monitoring

unit PMU

Anti-lightning

Powerdistribution

EMI

filter

EMI

filter

EMI

filter

DC contacter

Battery group Fuse

220VAC IN

-48VDC IN+

-

+24VDC IN+

-26VDC OUT

Load

-

Power Supply System



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PMU (Power Monitoring Unit) structure

AC/DC AC/DC AC/DC AC/DC

AC power supply

Power monitoringunit PMUFan

Fuse

Battery

Load

PMU



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mode capacity (TRX) boards (PSU) boards (PMU) notes

24VDC 1~12 0 1

48VDC 1~3 2 1 One PSUfor backup.

4~6 3 1

7~9 4 1

10~12 5 1

220VAC 1~3 3 1

4~6 4 1

7~9 5 110~12 6 1

The configuration of PMU:

PMU



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Providing fan feed

Fan revolution

speed control

Alarm detection

Interfaces

24V power supply input

interface

Fan box power supply

input interface

Fan fault alarm termina

Fan Monitoring Unit (FMU)

FMU



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Transceiver

Combiner&

dividerunit

Lightning

arr

ester

Lightning

arre

ster

TTA(optional)

TTA(optional)

CDU and Antenna System

Transceiving

antenna

Diverse

Receiving

antenna

Lightning Arrester is used to prevent the equipment from being

damaged by the lightening current inducted by the core line of thefeeder.

Lightning Arrester



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The tower amplifier is installed next to the

receiving antenna.

It can be used to increase the receiving

sensibility of the base station.

consisting of:

Triplex filter

Low noise amplifier

TTA (Optional)



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The BTS room is unattended and distributed in large

area.

Component:

Environment alarm boxCollecting external environment parameters

through various sensors, report to TMU.

TMU

Collecting the alarm signal, performs corresponding

processing, and reports it to BSC.

Part 4 Environment Supervising



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Each BTS312 cabinet can accommodate 12 carriers.

When the number of cell carriers is over 12, multiple

cabinets need to be equipped, classified as main

cabinet and auxiliary (backup) cabinets.

One set of BTS312 equipment group can contain twocabinets (24 TRX).

For the maximum capacity site, there are three groups

with 72 TRX.

Main/Auxiliary Cabinet



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Documents

OMD1100 BTS312 Hardware Structure ISSUE2_0