ZXSDR R8881 Product Description
UR13
Version
Date
Author
Reviewer
Notes
V1.00
2014-05-30
Yang Lisha
Chen Yong, Yang
Xu
First release, information of GSM, UMTS
dual-mode are all included
© 2015 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used
without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document is subjected to
change without notice.
ZXSDR R8881 Product Description
ZXSDR R8881 Product Description
ZTE Confidential & Proprietary 1
ZXSDR R8881 Product Description
TABLE OF CONTENTS
1 Overview ............................................................................................................ 5
1.1 Introduction .......................................................................................................... 5
1.2 Benefits ................................................................................................................ 5
1.3 Application Scenarios .......................................................................................... 6
2 Product Architecture ......................................................................................... 7
2.1 Physical Structure ................................................................................................ 7
2.2 Hardware Structure .............................................................................................. 7
2.2.1 Transceiver (RTR) ............................................................................................... 8
2.2.2 Power Amplifier (PA) .......................................................................................... 10
2.2.3 Duplexer (DFL) .................................................................................................. 10
2.2.4 Power Supply (PWR) ......................................................................................... 11
2.2.5 Lightning Protection Module (PIB) ...................................................................... 11
2.3 External Interfaces ............................................................................................. 11
2.4 Software Architecture ......................................................................................... 13
2.5 Functionality ....................................................................................................... 14
3 Technical Specifications ................................................................................. 15
3.1 Physical Indices ................................................................................................. 15
3.2 Performance Indices .......................................................................................... 16
3.2.1 Operation Frequency Band ................................................................................ 16
3.2.2 Capacity ............................................................................................................. 16
3.2.3 Receiver Sensitivity ............................................................................................ 16
3.2.4 TOC Output Power ............................................................................................ 17
3.3 Power Indices .................................................................................................... 17
3.3.1 Power Supply ..................................................................................................... 17
3.3.2 Power Consumption ........................................................................................... 17
3.4 Transmission ..................................................................................................... 18
3.5 Working Environment ......................................................................................... 18
3.6 Electromagnetic Compatibility ............................................................................ 18
3.7 Reliability ........................................................................................................... 19
4 Installation ....................................................................................................... 19
5 Configurations ................................................................................................. 20
6 Warning and Note ............................................................................................ 20
7 Abbreviation .................................................................................................... 21
2 ZTE Confidential & Proprietary
ZXSDR R8881 Product Description
ZTE Confidential & Proprietary 3
ZXSDR R8881 Product Description
FIGURES
Figure 1-1 R8881 Physical Structure .................................................................................. 5
Figure 2-1 R8881 System Structure .................................................................................... 7
Figure 2-2 R8881 External Interfaces ................................................................................12
Figure 2-3 SDR BTS Software Structure ............................................................................13
TABLES
Table 2-1 R8881 Modules ................................................................................................... 7
Table 2-2 R8881 External Interfaces Description ...............................................................12
Table 3-1 R8881 80W Physical Indices..............................................................................15
Table 3-2 R8881 80W Operation Frequency Band ............................................................16
Table 3-3 R8881 80W Capacity .........................................................................................16
Table 3-4 R8881 Static Receiver Sensitivity ......................................................................16
Table 3-5 R8881 TOC Output Power .................................................................................17
Table 3-6 R8881 Power Supply .........................................................................................17
Table 3-7 R8881 80W Power Consumption in UMTS Single Mode ....................................17
Table 3-8 R8881 80W Power Consumption in GSM Single Mode ......................................17
Table 3-9 R8881 80W Power Consumption in G/U Dual-Mode ..........................................18
Table 3-10 R8881 CPRI Interfaces ....................................................................................18
Table 3-11 R8881 Environment Condition Compatibility ....................................................18
Table 3-12 R8881 Reliability Characteristics ......................................................................19
4 ZTE Confidential & Proprietary
1 Overview
1.1 Introduction
With the multi-mode era coming, ZTE, who is dedicated to providing comprehensive
network solutions and delivering the future-oriented quality network for the operators,
developed the ground breaking SDR unified platform with the essential feature to support
multi-mode and multi-band radio access.
Based on this innovative SDR platform, ZTE promotes a series of products to satisfy
different scenario requirements, including the indoor macro, outdoor macro, distributed,
outdoor micro, mini and pico base station. In this document, R8881 is introduced.
ZXSDR R8881 Product Description
ZTE ZXSDR R8881 (hereinafter referred to as R8881) is a distributed Remote Radio Unit
(RRU) used in ZTE Uni-RAN solution, with 1-way transmitting and 2-way receiving.
R8881 80W works in GSM or UMTS single mode or multi-mode.
Figure 1-1 R8881 Physical Structure
1.2 Benefits
R8881 is one of the most widely used remote radio units in ZTE SDR base station series.
The following part lists the key benefits for operators.
High performance
ZTE Confidential & Proprietary 5
ZXSDR R8881 Product Description
To meet with the growing demands for wide working bandwidth, R8881 modules
with full working bandwidth are released. Maximum working bandwidth of R8881 is
75MHz for 1800M band and 35MHz for 900M band. For frequency spectrums
become scarce, resources allocated for operators tend to be characterized with
fragmentation and large span. RRUs with full working bandwidth integrate more
spectrum resources and help to decrease hardware investment exponentially. (This
is the maximum bandwidth of the RF modules. Please make the actual module as
the standard.)
Clearer and simpler network
R8881 supports GSM, UMTS, or mixed technologies. Instead of running hardware
on independent platforms for each technology, operators can implement various
wireless technologies in software on the same hardware platform.
Since hardware platforms can be reused, there is significantly less investment risk
for deploying hardware. Wireless technologies are developing so fast, and investing
on one technology may bring risks to operators. SDR-based solutions will decrease
the investment risk since SDR platform can support various technologies.
High PA Efficiency, Low Power Consumption
The PA of R8881 achieves high efficiency with ZTE patent Doherty, Digital
Pre-Distortion (DPD) and Dynamic Power Trace (D-PT) technologies. The PA
power supply voltage is dynamically adapted to the output power, reducing RU’s
power consumption.
1.3 Application Scenarios
The R8881s and one base band unit (BBU) form a complete BTS/NodeB. It implements
radio transmission in the covered area, controls radio channels and communicates with
the Base Station Controller (BSC/RNC). It supports indoor and outdoor applications.
6 ZTE Confidential & Proprietary
Code
Function
RTR
Receives and transmits the signals of panel interfaces, digital
intermediate frequency and RF, and controls clock, power and
power amplification.
PA
Amplifies downlink RF signals and outputs them to the duplexer.
PWR
AC/DC in Rx in Rx out ANT1 ANT2
AISG
RS485/LMT
Dry Contact
DFL
OPT1
OPT2
PIB RTR PA
R8881
2 Product Architecture
2.1 Physical Structure
R8881 is the SDR based multi-carrier remote RF unit (RRU). It has one transmitter.
R8881 80W is 370mm*320mm*170mm (H*W*D) in dimension and 18 kg in weight.
2.2 Hardware Structure
R8881 consists of transceiver (RTR), power amplifier (PA), duplexer (DFL), power (PWR)
and lightning protection module (PIB), as introduced below. The hardware structure of
ZXSDR R8881 Product Description
R8881 is shown below.
Figure 2-1 R8881 System Structure
Table 2-1 R8881 Modules
ZTE Confidential & Proprietary 7
ZXSDR R8881 Product Description
Code
Function
DFL
Consists of a duplexer, filter and their own low-noise amplifier
subsystems. It can receive diversities.
PWR
Provides EMC protection for the power interface, monitoring
interface, and the AISG interface.
PIB
Provides lightning protection for the AISG, RS485 and dry
contacts
2.2.1 Transceiver (RTR)
Optical interface processing function
Supports RRU cascading.
Exchanges IQ data with the baseband resource pool.
Implements message interaction such as management, maintenance and
signaling.
Clock processing function
Recovers clock for data on the optical interface to generate reference clock
source.
Generates work clock based on the local reference clock of high-stability clock
phase locked.
Downlink processing function
Format conversion for downlink output IQ data
Downlink power calibration
Downlink peak clipping
Pre-distortion processing for downlink digits
Downlink single transfer channel
TCPW detection
8 ZTE Confidential & Proprietary
Uplink processing function
Format conversion for uplink output IQ data
Uplink power calibration
RCPW detection function
RF hopping function
Rate adaptation modulation function
Monitoring function
PA Forward power detection — when the forward power exceeds the power
alarm threshold, the TRM reports an alarm and controls PA output by the
ZXSDR R8881 Product Description
signal of enabling PA output shutoff.
PA reverse power (SWR) detection — when the reverse power exceeds the
SWR alarm threshold, the TRM reports an alarm and controls PA output by the
signal of enabling PA output shutoff.
PA temperature detection — when the temperature exceeds the
over-temperature alarm threshold, the TRM reports an alarm and controls PA
output by the signal of enabling PA output shutoff.
Enabling PA output shutoff
Transmit output power detection function
Power input under-voltage alarm detection and report
Power output under-voltage alarm detection and report
System environment supervision function
TCPW message report function
RCPW message report function
PLL unlocked alarm function
ZTE Confidential & Proprietary 9
ZXSDR R8881 Product Description
CPRI self-detection alarm function
Hardware configuration information for all RRU modules
Indicator function
Interfaces connecting with external equipment
Two CPRIs
Four input dry contacts
One RS485 serial port, communicating with external monitoring equipment
One network port for local debugging
One AISG electrically–tuned antenna interface
Two interfaces for combining cabinets
2.2.2 Power Amplifier (PA)
Amplifies downlink RF signals and outputs them to the duplexer.
Provides a pre-distortion feedback interface for the RTR.
Provides an SWR detection interface for the RTR.
Provides a read-write interface for module asset management.
Provides individual switch-off control.
Detects the module internal temperature.
2.2.3 Duplexer (DFL)
Lightning protection
Receives diversities
Expands ports for frequency points
10 ZTE Confidential & Proprietary
2.2.4 Power Supply (PWR)
DC power supply:
Converts voltage for the system power supply
Provides the lightning protection for -48 V power supply
Provides -48 V power filter
AC power supply:
Converts voltage for the system power supply
Supports 110V/220V AC power supply
ZXSDR R8881 Product Description
2.2.5 Lightning Protection Module (PIB)
Provides lightning protection for the AISG, RS485 and dry contacts
2.3 External Interfaces
R8881’s external interfaces are located at the bottom and side, as shown in the following
figure.
ZTE Confidential & Proprietary 11
ZXSDR R8881 Product Description
S.N.
Label
Interface
Interface Type/Connector
1
RXin
Combined cabinet
interface
N-mode connector
2
RXout
Combined cabinet
interface
N-mode connector
3
GND
Protection
ground interface
16 mm2 yellow/green round terminal
4
ANT1
(TX/RX)
Transmit/receive
antenna
feeder interface
50Ω DIN-mode Connector
5
ANT2
(RX)
Receive antenna
feeder interface
50Ω DIN-mode Connector
1 2 3 4 5
10 9 8 7 6
a b
c
a: Front view
b: Side view
c: Bottom view
11
Figure 2-2 R8881 External Interfaces
The interfaces are described in the following table.
Table 2-2 R8881 External Interfaces Description
12 ZTE Confidential & Proprietary
6
OPT1
BBU and RRU
Interfaces/RRU
cascading interface
LC-mode optical interface (IEC 874)
7
OPT2
RRU cascading
interface
LC-mode optical interface (IEC 874)
8
AISG
AISG equipment
interface
8-pin circle connector (IEC
60130-9-ED) (female)
9
MON
External monitoring
interface
8-pin circle connector (male)
10
PWR
Power input interface
DC: 2-pin round connector (pin)
AC: 3-pin round connector (pin)
11
LMT
O&M Ethernet interface
8P8C angle socket, PCB shielded
welding, LED phone (LED indicators:
yellow for left indicator and green for
right indicator)
GSM/UMTS Functions
OMC-B
SCS
OAM
DBS
BRACS
BRS
Hardware (BSP)
Linux
LMT
OSS
ZXSDR R8881 Product Description
2.4 Software Architecture
The software system of R8881 can be divided into operating support layer and
application layer.
Figure 2-3 SDR BTS Software Structure
ZTE Confidential & Proprietary 13
ZXSDR R8881 Product Description
The operating support layer provides the functions of OSS, while OAM, DBS, BRS,
BRACS and SCS serve different BTS modes.
Operating and Maintenance (OAM) provides the configuration, alarm and
performance measurement function.
Database Sub-system (DBS) is the database system.
Bearer Sub-system (BRS) processes the protocol stack.
Bearer Access Control Sub-system (BRACS) controls the access to bear layer.
System Control Sub-system (SCS) controls the power supplying and active/standby
switching.
Operation Support Sub-system (OSS) is the support layer in this entire framework, which
is a hardware platform for running software and provides basic functions like scheduling,
timer, memory management, communication, sequencing control, monitoring, alarming
and logging.
Board Support Package (BSP) is the software closely connected with the board
hardware and supports Real Time Operation Support Sub-system (RT OSS) to work on
the board.
2.5 Functionality
R8881 supports functionalities as follows.
Supports multi-band of 850M/900M/1800M/1900M/2100MHz/AWS.
Supports the configuration of 5MHz/4.8MHz/4.6MHz/4.4MHz/4.2MHz channel
interval for UMTS carrier.
Supports the configuration of 1.4MHZ/3MHz5MHz/10MHz/15MHz/20MHz scalable
bandwidth.
Supports one way transmitting and two-way receiving.
14 ZTE Confidential & Proprietary
Item
Index
Dimension (H*W*D)
370 mm * 320 mm * 170 mm
Weight
18 Kg
Color
Silver gray
R8881 80W supports GSM, UMTS single mode or GSM/UMTS dual-mode.
Supports combination of two R8881 units to achieve same receiving sensitivity
without adding antenna.
Supports RTWP report interval at 100ms and 2ms.
Supports transmit power reporting function for every carrier.
Supports over loading protection function for power amplifier.
Supports measurement, compensation and adjustment function for channel delay.
Supports dynamic PA voltage adjustment to achieve best efficiency in different
system loads.
ZXSDR R8881 Product Description
Supports transmitting channel switching on/off function.
Supports built-in lightning protection function for DC power supply.
3 Technical Specifications
3.1 Physical Indices
R8881 employs the compact design, whose physical indices are listed below.
Table 3-1 R8881 80W Physical Indices
ZTE Confidential & Proprietary 15
ZXSDR R8881 Product Description
Mode
RRU Frequency Spectrum (MHz)
GSM single mode
850/900/1800/1900
UMTS single mode
850/900/1900/2100
G/U dual-mode
850/900/1900
Mode
Capacity
GSM single mode
6 TRXs
UMTS single mode
4 CSs
G/U dual-mode
4 GSM TRXs + 1 UMTS carriers, or
2 GSM TRXs + 2 UMTS carriers
Mode
Frequency
Spectrum(MHz)
Single Antenna
(dBm)
Dual Antennas
(dBm)
Four Antennas
(dBm)
GSM
900/1800
-113.5
-115.5
N/A
UMTS
2100
-126.5
-129.2
N/A
900
-126.4
-129.1
N/A
3.2 Performance Indices
3.2.1 Operation Frequency Band
Table 3-2 R8881 80W Operation Frequency Band
3.2.2 Capacity
Table 3-3 R8881 80W Capacity
3.2.3 Receiver Sensitivity
The receiver sensitivity of R8881 is shown as following table:
Table 3-4 R8881 Static Receiver Sensitivity
16 ZTE Confidential & Proprietary
Mode
TOC Output Power
R8881
80W
RRU Type
Index
R8881 80W
DC: -48 V (-37 V – -60 V DC)
AC: 220 V / 110 V (90 V – 290 V AC)
Item
Power Consumption (W)
Average
Peak
2C/TOC 40W (900MHz)
130
175
2C/TOC 40W (2100MHz)
125
180
Item
Power Consumption (W)
Average
Peak
900MHz S6/TOC 80W
185
305
1800MHz S6/TOC 80W
190
310
3.2.4 TOC Output Power
Table 3-5 R8881 TOC Output Power
Note: When “ZGO-04-01-011 Power Boost for 8PSK” is applied in GSM mode, the TOC output
power achieves the same in 8PSK modulation as in GMSK.
3.3 Power Indices
3.3.1 Power Supply
ZXSDR R8881 Product Description
Table 3-6 R8881 Power Supply
3.3.2 Power Consumption
Table 3-7 R8881 80W Power Consumption in UMTS Single Mode
Table 3-8 R8881 80W Power Consumption in GSM Single Mode
ZTE Confidential & Proprietary 17
ZXSDR R8881 Product Description
Item
Power Consumption (W)
Average
Peak
900MHz 4G1U/
TOC 15W/TRX+20W/Carrier
205
305
Item
Value
Interface Type
Speed
CPRI interface
2
SFP (LC)
1.25Gbps
Item
Index
Temperature
-40 – +55 °C
Relative humidity
5% – 95%
Waterproof/dustproof
IP65
Ground
≤5 Ω; earth resistance can be less than 10 Ω in
thunder-less area where there less than 20 thunderstorm
days per year.
Storage
Indoor pack deposited
Temperature: -40 °C – 70 °C
Relative Humidity: 5% – 100%
Table 3-9 R8881 80W Power Consumption in G/U Dual-Mode
3.4 Transmission
R8881 is connected to BBU through CPRI interfaces.
Table 3-10 R8881 CPRI Interfaces
3.5 Working Environment
Table 3-11 R8881 Environment Condition Compatibility
3.6 Electromagnetic Compatibility
YD/T 1595.2-2007
18 ZTE Confidential & Proprietary
Item
Index
MTBF
DC: ≥554,000 hours
AC: ≥540,000 hours
MTTR
1 hour
Availability index
DC: ≥99.999819%
AC: ≥99.999815%
Down duration
DC: ≤0.949 min/year
AC: ≤0.973 min/year
ETSI EN 301 489-01, ETSI EN 301 489-23
ETSI EN 300 386–V1.3.2
(CISPR22) Class B
Directive 1999/5/EC (R&TTE)
3.7 Reliability
Table 3-12 R8881 Reliability Characteristics
ZXSDR R8881 Product Description
4 Installation
R8881 is easy to be deployed.
It is portable to transport and flexible to install on the pole, tower and against wall.
Only fibers, power cables, RF cable antennas and AISG cables need to be
connected.
It suits any weather condition with water resistance and dust proof case, which
reaches IP65.
ZTE Confidential & Proprietary 19
ZXSDR R8881 Product Description
5 Configurations
R8881 80W can be configured in GSM single mode, UMTS single mode or GSM/UMTS
dual-mod through software. One R8881 supports one cell and three R8881 modules
form one three-sector site.
6 Warning and Note
Warning: Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radiofrequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which
the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.
FCC Radiation Exposure Statement:
20 ZTE Confidential & Proprietary
Abbreviation
Full Name
3GPP
3rd Generation Partnership Project
BBU
Base Band processing Unit
BRACS
Barrier Access Control Sub-system
BRS
Barrier Sub-system
BSP
Board Support Package
CAPEX
Capital Expenditure
CPRI
Common Public Radio Interface
DBS
Data Base Sub-system
DL
Downlink
DSP
Digital Signal Processing/Processor
DTX
Discontinuous transmission
GSM
Global System for Mobile communications
HSPA
High Speed Packet Access
LMT
Local Maintenance Terminal
MIMO
Multi Input Multi Output
MTBF
Mean Time Between Failures
MTTR
Mean Time To Recovery
OAM
Operating And Maintenance
OPEX
Operation Expenditure
OSS
Operation Support Sub-system
PLL
Phase Locked Loop
RCPW
Received Carrier Power
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with minimum distance
10m between the radiator & your body.
7 Abbreviation
ZXSDR R8881 Product Description
ZTE Confidential & Proprietary 21
ZXSDR R8881 Product Description
RF
Radio Frequency
RRU
Remote Radio Unit
RTWP
Received Total Wideband Power
SCS
System Control Sub-system
SDR
Software Defined Radio
TCPW
Transmitted Carrier Power
UE
User Equipment
UMTS
Universal Mobile Telecommunications System
UTRAN
UMTS Terrestrial Radio Access Network
22 ZTE Confidential & Proprietary
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