08-GB_SS41_E1_1 Principle and Hardware Structure of ZXSDR Base Station 35

GB_SS41_E1_1 ZXSDR Base Station

ZTE University

GSM BSS Course Team

Background

• In order to provide more competitive

communication devices and solution for

customers, ZTE designs SDR base station.

• This PPT introduces SDR Base Station:

– ZXSDR BS8700(B8200+R8860)

– ZXSDR BS8800 GU360

– ZXSDR BS8900 GU360

Content

SDR Base Station Overview

ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure


What is SDR

SDR Base Station Structure


What is SDR

The SDR forum defines 5 levels of software radio

technologies: HR, SCR, SDR, ISR and USR.


What is SDR

HR: hardware radio Tier0. It is represented by the

traditional single mode base station.

SCR: Software Controlled Radio. It is represented by the

base station with different transceivers of different modes.

It has made certain integration on software only.

SDR: Software Defined Radio, namely the software may

select different modulation system, wide band signal or

narrow band signal. It is represented by ZTE SDR series

base station products of leading technology in the world.


What is SDR

ISR: Ideal software radio, its characteristic is it eliminates

analogue RF end, and the entire system may be program

controlled except for antenna.

USR: Ultimate Software Radio. It has ISR functions but also

requires standardized controller software. The switch between

different radio modes achieves a millisecond level speed.

Because of technical reasons, the two kind technologies above

are not yet available for large-scale commercial application.


What is SDR

The key feature of SDR---the radio modes may be defined by

software.

1 、 The RF front end processes signals of multiple radio modes simultaneously

2 、 The baseband processes signals of multiple radio

modes simultaneously

3 、 The software is integrated into a unified software version

SDR technical requirement SDR technical requirement ———— the system supports the system supports

multi-radio modes multi-radio modes



This technology breaks through the traditional base station

structure where the TRX baseband RF is in a single module

by introducing baseband and RF separated structure

(BBU+RRU/RU)

Multi-mode baseband pool BBU platform

Multi-mode RF RU platform

IP processed base station internal data flow

OMC platform: OMCR and OMCB

Unified software platform

The core point of SDR base station structure is baseband and RF separation and platform



Baseband BBU and RF unit RRU/RU are separated

ANT

Transceiver Front end

receiver

Duplexer

Multi-carrier

amplifier

Exterior power

supply Power system

220VAC

RRU/RU

BBU subsystemBBU subsystem

Resource control

panel

BBUFiber



Macro station - - BBU and RU are placed in the cabinet, with

the only difference to the distributed base station is the

structure. Currently there are indoor macro station BS8800 and

outdoor macro station BS8900.

ZXSDR BBUZXSDR BBU

ZXSDR RU

MSMSUmUm

Feeder



Distributed base station - - BBU and far-end RF unit RRU are

separated and construct a distributed base station system. At

present, BBU refers to B8200 dual-mode baseband pool, and

RRU is the RF remote unit R8860.

ZXSDR BBUZXSDR BBU ZXSDR RRU

RF

MSMSUmUm

CPRICPRI

FiberFiber


Content



B8200+R8860 Overview& Hardware structure

System Position in Network

Equipment Appearance

System Indices

System Working Principles

Hardware structure


System Position in Network

B8200+R8860 functions as the base station (BTS/Node

B), forming the Base Station Subsystem (BSS) with the

radio network controller (BSC/RNC)

BSS

BSC/RNC

BSS

BSC/RNC

CN

A/Gb/Iu A/Gb/Iu

Iur

Abis/Iub Abis/Iub Abis/Iub Abis/Iub

Um/Uu

UE

OMCR/OMCB

B8200 GU360 B8200 GU360 B8200 GU360 B8200 GU360

R8860 R8860 R8860R8860

R8860 R8860


Equipment Appearance

BBU is arranged indoors or outdoors and connected with RRU

(usually arranged outdoors) through optical fiber

Feeder cable

BBU

Optical fiber

AntennaPole

RRU

BBU:B8200 RRU:R8860


System Indices

Dimension

B8200: 88.4 mm×482.6 mm×197 mm (H × W × D)

R8860: 500 mm×320 mm×172 mm (H × W × D)

Power supply

-48V, range: -40V DC~-57V DC

Temperature

B8200: -15 °C ~ 50 °C

R8860:-40 °C ~ 55 °C


System Indices

R8860 RF Output Power

GSM: GMSK 60 W/ 8PSK 40 W

UMTS: 60 W

R8860 Static Receiving Sensitivity

GSM: -112 dBm

UMTS: -125 dBm

Power Consumption

B8200≤180 W

R8860 ≤390 W



BBU

RRUBBU

GPS antenna

SAE1/T1

BSC/RNC

IQ switching

IQ GE

RRU

FA

Baseband layer

PM

Abis/Iub

Clock

GE

FE/GE

uBPG /BPC

FS GEswitching

CC

Fiber



BBU performs Abis/Iub interf

ace functions, signaling proc

essing,baseband processin

g, remote and local O&M fu

nctions, working status moni

toring, and alarm functions.



RRU performs the following functions:

Performs terminal access and RF link transmission function

through Um/Uu interface, including RF signal processing, c

hannel coding and decoding, channel multiplexing and de-

multiplexing, measurement and report, power control, trans

mission diversity, reception diversity, calibration, and synchr

onization.

Connects with BBU through the optical interface. Functions

performed by the optical interface include IQ data transmiss

ion, reporting measurement information, RF function config

uration, and clock synchronization.



Service Signal Flow

RRU



Control Signal Flow

RRU



Clock Signal Flow

RRU


Hardware structure

B8200


Hardware structure

CC functions and panel

GPS system clock and RF reference clock

Abis/Iub interface function

Ethernet switch function, providing switch plane for signalin

g stream and media stream

Rack management


Hardware structure

UBPG functions and panel

Baseband modulation: handles 12 carriers on downlink at

maximum

Baseband modulation: handles 12 carrier on uplink at maxi

mum

Supports baseband frequency hopping

Supports static and dynamic power control


Hardware structure

BPC functions and panel

Coding/multiplexing, rate matching, channel mapping, spectrum

spreading and scrambling, power weight and channel synthesis for

downlink data

Rake receiving and channel decoding for uplink data, transmission

of uplink data to Iub interface

Supporting radio link synchronization and transmission-frame proc

essing

Power control

Soft switch

Measurement


Hardware structure

FS functions and panel

Baseband IQ data exchange

Providing the interface between BBU and RRU


Hardware structure

SA functions and panel

Alarm monitor and rev control of no more than 9 fans

Signal monitor and interface lightning protection for the rack

Providing 6 input dry contact interfaces, 2 input/output dry

contact interfaces

Providing 8 lines of E1/T1 interfaces


Hardware structure

PM functions and panel

16 internal interfaces for +12 V load power

16 internal interfaces for +3.3 V management power

EMMC management

Measurement and protection of input over-voltage and

under-voltage

Output over-current protection and load power

management


Hardware structure

FA functions and panel

System temperature monitoring an

d control

Monitoring, control, and report of f

an state


Hardware structure

R8860

R8860 is a multi-carrier RF module,

which contains duplexer filter, multi-

carrier power amplifier, transceiver,

interface processing board, and

power. One R8860 supports a

maximum of 6 carriers.


Hardware structure

R8860 is composed of DTR, PA60, DFL, RIE, PIB, and

PRDC.


08-GB_SS41_E1_1 Principle and Hardware Structure of ZXSDR Base Station 35

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