Zte Bts Zxg10

BTS(ZXG10-B8018) Primary Training

Shanghai R&D Center: Liu Yuhong23/4/7

What you will learn in this course

• Part1: BTS Basic• Some concepts• CS Voice Services• TSs in Abis Interface• Abis Networking Mode

• Part2: ZXG10-8018• B8018 System Structure• Clock Synchronization• B8018 Hardware Architecture• B8018 Software Structure

• Part3: Primary Trouble-Shooting• Antenna and Feeder System• VSWR• TCH Assignment Failure• Call Test• Hardware Alarm

Study Method

• This course is just a primary and brief but very important course.

• Try to understand and learn all terms by heart in this class!

• After you understand all basic concepts, then you will know what you want and could find all details in technical manual.

• You may break me at anytime when you cannot understand what I am talking.

Agenda

• Part1: BTS Basic– Some concepts– CS Voice Services– TSs in Abis Interface– Abis Networking Mode

• Part2: ZXG10-B8018

• Part3: Primary Trouble-Shooting

Some Concepts

BTS, Rack, Slot BTS Networking Cell/Sector Antenna, Feeder, RF Cable Channel, TCH, LAPD, O&M VSWR dB, dBm, 40w=?dBm, gains loss.

BTS In GSM/GPRS Network

CS Voice Services

Supports the following CS voice services: FR EFR HR AMR

1. Please tell me the bandwidth of FR and HR?

2. Do you remember the Abis interface structure? Draw it now.

3. Normally how many TRX approximately can be supported in 1 E1 by ZXG10-BTS?

Um Interface

Layer 3 consists of three sub-layers:

1. Radio Resource Management (RR) –channel req

2. Mobility Management (MM) – auth,

3. Connection Management (CM) – setup, connect

Channel Combination

Um - BCCH, SDCCH SDCCH

0 BCCH

1 SDCCH(CBCH)

2 TCH

3 TCH

4 TCH

5 TCH

6 TCH

7 TCH

Abis Interface

Layer-1 (bottom) is the physical layer and it is the PCM digital link at the rate of 2 Mbps.

Layer-2 (middle) is the data link layer and it is based on LAPD. Layer-3 (top) transparently transmits the layer-3 messages on

Abis interface and manages radio resources.

4 Types of TSs in Abis Interface

1. TCH for TRM service

2. LAPD for TRM signaling

3. O&M for operation and maintenance signaling

4. EAM Transparent passage: for transparent environment monitoring channel

1 TRX 1 LAPD Channel 1 Rack 1 O&M Channel

If we don’t use multiplexing technology, approximately how many TRX are supported in one Abis E1?

And how about using LAPD 1:4 multiplexing?

No BCCH.SDCCH…

TS0

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TCH TCHTCHTCH

TS28

Cell 1

LAPD1.5+LAPD2.1+LAPD2.2+LAPD2.3

TCH TCHTCHTCH

TCH TCHTCHTCH

TS31

TS29

Cell 2

Cell 3

TS30LAPD2.4+LAPD2.5+LAPD3.1+LAPD3.2

LAPD3.3+LAPD3.4+O&M1+O&M2O&M3

TS27 LAPD1.1+LAPD1.2+LAPD1.3+LAPD1.4

Abis 1:? Multiplexing

Solution

LAPD/O&M 1:4 multiplexing

3 O&M Channels in one Site, why?

LAPD(O&M) Independently

TCH, LAPD 12~14 TRX

Abis Networking Mode

Star Chain Tree Ring

Agenda

• Part1: BSC Basic

• Part2: ZXG10-B8018– B8018 System Structure– Clock Synchronization– B8018 Hardware Architecture– B8018 Software Structure

• Part3: Primary Trouble-Shooting

ZTE BTS V3 Family

B8018

ShelterBTS

B8112B8202

IndoorOutdoor

Indoor: 0 Outdoor: 1-macro,2-micro

B8018 System Structure

Rack Layout

Rack

Shelf (Layer)

Slot

Clock Synchronization

Internal Synchronization Free oscillation Clock Rectification every 6 months

External Synchronization (Net mode)

If the Abis transmission quality is very good, which of clock synchronization mode is the best choice? Why?

B8018 Hardware Architecture

B8018 Software Structure

dCMM software subsystem dFUC software subsystem dCHP software subsystem FIU software subsystem (optional)

Show software in laptop

BTS Software Management

Do you remember how ZXG10-BSCV2 manage BTS version?

Software Loading

General Version Setting

Reset CMB

BTS Software Downloading

Answer:

Working Principle

EIB/

CMB

PDM

TRM1

A

E

M

FCM

MMI

ZXG10-BTS (V3)

Internal communication BUS

TRM2

TRMn

Radi o tower

BSC

Abis Um

Cabinet Top Structure

E1-ABCD,EFGH

SYNC

DIP Switches & Jumper

BTS_TYPE: 1100: B8018 1101: B8112 … BTS_NO: No. of the cabinet of the same site 00: Basic cabinet 01:

Extended cabinet 1 10: Extended cabinet 2 SLAVE1_PORT: The E1 port of the basic cabinet to connect extended

cabinet 1: 00: Port E of the basic cabinet, F,G,H SLAVE2_PORT: The E1 port of the basic cabinet to connect

extended cabinet 2: 00: Port E of the basic cabinet, F,G,H SATE: Whether to use the satellite Abis link or not ABIS_PORT: O&M port number: 00: Port A,B,C,D ABIS_TS: The O&M LAPD timeslot on the Abis interface: 000: TS16,

25~31

CMB – Controller & Maintenance Board

CMB works in active/standby mode. We must know the meaning of 6 indicator lights!!!

PWR, RUN, SYN, CLK, MST and STA

EIB – E1/T1 Interface Board

The EIB provides the Abis interface connecting to the BSC. DIP switches

to define E1 mode: 100 Ω T1, 120 Ω E1(all are off) or 75 Ω E1.

PDM – Power Distribution Module

There are 12 breakers on the PDM panel controlling the power supply of two CMBs, one EIB, and nine DTRUs(CDU).

DTRU – Dual Transceiver Unit Working Band & Module Name

GSM900 DTRUG GSM850 DTRUM GSM1800 DTRUD GSM1900 DTRUP

Identifier Meaning RXM1 Receiver 1 RXD1 Receiver 1 (for diversity) TX1 Transmitter 1 RXM2 Receiver 2 RXD2 Receiver 2 (for diversity) TX2 Transmitter 2 TXcom Transmitter Combiner ETP Extend Test Port

DTRUG

AEM - Antenna Equipment ModuleWorking Band Module Name

GSM900 CDUG

CEUG

BCDUG

GSM1800 RDUD

CEUD

CDUP

The CDU supports one 2-in-1 combiner, a 1-to-4 low-noise amplifier.

1 Extended TX port (ETX)1 Radio test port (RTE)2 Combiner input ports (TX1 - TX2)4 Low-noise amplifier output ports (RX1 - RX4)2 Low-noise amplifier extended output ports (ERX1 - ERX2)1 Antenna feeder port (ANT)

Boards Summary

BTS O4 Configuration

TX/RX TX/RX

TRM1TX RX RXD

TRM2TX RX RXD

TRM4TX RX RXD

CDUTX1 TX2 RX1 RX2 RX3 RX4

CDUTX1 TX2 RX1 RX2 RX3 RX4

TRM3TX RX RXD

Quiz – O2 RF Cable Connection

Quiz – O4 RF Cable Connection

BTS V3 Expansion

S6/6/6 S12/12/12 S18/18/18

What more things are needed when we make expansion?

Agenda

• Part1: BTS Basic

• Part2: ZXG10-B8018

• Part3: Primary Trouble-Shooting– Antenna and Feeder System– VSWR– TCH Assignment Failure– Call Test– Hardware Alarm

Antenna and Feeder System

antenna

1/2 inch Jump wire

7/8 inch Feeder cable

Cable grounding kit

½ inch jump wire

rack

Arrester Cable grounding kit

room

This is one Cell figure.

2 panels is in one ant board.

Double Check!

Double Check!

In BTS Room

VSWR

Do you remember what VSWR is?

VSWR （ Voltage Standing Wave Ratio ） = (Pout+Pr)/(Pout-Pr)

1 is the ideal value, but never equals. The higher, the worse. In ZTE, new site <=1.3, old site <=1.5, if

VSWR>=2.0, blocked For new site, it is a critical value.

General Trouble List

TCH assignment failure rate > 5% TCH assignment failure rate > 5% based on the performance report and the TRX Basic Measurement

Bad Cell day rate > 30%Bad Cell day rate > 30%based on the performance report

Other AlarmsOther AlarmsSuch as TRM alarm Fan alarm & PA temperature alarm SWR of AEM HYCOM major alarm

TCH Assignment Failure

Possible reasons:Possible reasons:1.low output power2.RF cable connection

3. ANT swapping between cells4.interference

5. radio parameter 6. Fault TRM

Solutions:Solutions:1.measuring the output power of those TRX, replacing low output power TRX2. Check the RF cable connection and change the RF cable if needed

3. Check jumper, feeder and ANT connection (better with the help of DT)4. Background parameter adjusting5. RF team revising the frequency

6. Change TRM with a new one

BCCH

ANT Swapping!!

Site Master

SWR 1. Verify 2. Band

DTF 1. Don’t believe it

blindly.

Call Test After Change Hardware

STEP BY STEP!

OMCR Room:Block the TCH Channels in BCCH TRMBlock the TCH TRM which you don’t want to test

BTS Room:Confirm the indicator lights on TRM panelMake Call test ( as many as you can)Draw a conclusion with statistics

OMCR Room:Unblock all channels and confirm them in ‘Dynamic management ’

BTS Room:Confirm the indicator lights on TRM panel

Very Important for finding out the wrong installation or hardware!!

Hardware Alarm Management

1. Current Alarm

2. History Alarm

3. Typical List

Transmission - E interface

Cell Break – transmission, power

SWR alarm

TRM alarm – Reset/Change

FAN/Temperature alarm - AC

Summary

• Part1: BTS Basic• Some concepts• CS Voice Services• TSs in Abis Interface• Abis Networking Mode

• Part2: ZXG10-8018• B8018 System Structure• Clock Synchronization• B8018 Hardware Architecture• B8018 Software Structure

• Part3: Primary Trouble-Shooting• Antenna and Feeder System• VSWR• TCH Assignment Failure• Call Test• Hardware Alarm