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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
SDR Base Station Overview
What is SDR
SDR Base Station Structure
SDR Base Station Overview
What is SDR
The SDR forum defines 5 levels of software radio
technologies: HR, SCR, SDR, ISR and USR.
SDR Base Station Overview
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.
SDR Base Station Overview
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.
SDR Base Station Overview
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
SDR Base Station Overview
SDR Base Station Structure
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
SDR Base Station Overview
SDR Base Station Structure
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
SDR Base Station Overview
SDR Base Station Structure
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
SDR Base Station Overview
SDR Base Station Structure
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
SDR Base Station Overview
Content
SDR Base Station Overview
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
B8200+R8860 Overview& Hardware structure
System Position in Network
Equipment Appearance
System Indices
System Working Principles
Hardware structure
ZXSDR B8200+ZXSDR R8860 Overview& 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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
System Working Principles
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
System Working Principles
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.
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
System Working Principles
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.
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
System Working Principles
Service Signal Flow
RRU
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
System Working Principles
Control Signal Flow
RRU
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
System Working Principles
Clock Signal Flow
RRU
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
Hardware structure
B8200
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
Hardware structure
FS functions and panel
Baseband IQ data exchange
Providing the interface between BBU and RRU
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
Hardware structure
FA functions and panel
System temperature monitoring an
d control
Monitoring, control, and report of f
an state
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
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.
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure
Hardware structure
R8860 is composed of DTR, PA60, DFL, RIE, PIB, and
PRDC.
ZXSDR B8200+ZXSDR R8860 Overview& Hardware structure