ZXWR R8840 Technical Specification V3.22

ZXWR R8840Technical Specification

ZXWR R8840 Product Description


About the Document

Version Date Author Approved By RemarksV3.0 11/11/2006 Not open to the Third Party

V3.20 11/13/2006 Xie

V3.21 11/16/2006 Xie Rename the RRU name

V3.22 11/29/2006 Xie Change power efficiency to 30%

ZTE Confidential Proprietary 1

Copyright © 2006 ZTE Corporation Shenzhen P. R. China

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE Corporation and is not to be disclosed or used except in accordance with applicable agreements.

Due to update and improvement of ZTE products and technologies, information of the document is subjected to change without notice.

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Table of Contents1 Overview...................................................................................................................................1

1.1 Background.........................................................................................................11.2 Product Application............................................................................................2

2 R8840 System construction.....................................................................................................32.1 R8840 Physical Structure....................................................................................32.2 R8840 General Structure.....................................................................................42.3 Volume................................................................................................................52.4 Weight.................................................................................................................52.5 Total Power Consumption..................................................................................5

3 R8840 Function........................................................................................................................63.1 Configuration Function.......................................................................................63.2 Networking Function..........................................................................................63.3 Service Function.................................................................................................73.4 Other Function....................................................................................................7

4 R8840 Performance.................................................................................................................74.1 System Indices....................................................................................................74.2 Transmitter Indices.............................................................................................84.3 Receive Sensitivity..............................................................................................8

5 Operation and Maintenance...................................................................................................85.1 User Interface......................................................................................................85.2 Configuration Management................................................................................85.3 Performance Management..................................................................................95.4 Alarm Management............................................................................................95.5 Maintenance Management..................................................................................9

6 Physical Interfaces.................................................................................................................116.1 Interface Between R8840 and BBU..................................................................116.2 Interface Between R8840 and Feeder...............................................................116.3 Interface Between R8840 and Electrical Tilt Antenna.....................................116.4 RS485 Port........................................................................................................116.5 Ports for Input Trunk Nodes.............................................................................116.6 Power Port.........................................................................................................11

7 Engineering Characteristics.................................................................................................127.1 R8840 Environmental Adaptability..................................................................127.2 R8840 Mechanical Adaptability.......................................................................127.3 R8840 Installation Requirements......................................................................137.4 Power Supply....................................................................................................13

7.4.1 220V AC Input...................................................................................................137.4.2 -48V DC Input....................................................................................................13

7.5 Protection Requirement....................................................................................14


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7.6 Grounding Requirement....................................................................................147.7 R8840 EMC Indices..........................................................................................147.8 Safety Requirement...........................................................................................157.9 Environmental Protection Requirement............................................................15


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Figures and Tables

FiguresFigure 1 Node B in the WCDMA System...............................................1Figure 2 Distributed Base Station Equipment..........................................2Figure 3 R8840 Mounted on the pole (without sun shade ).....................3Figure 4 R8840 Mounted on the pole (with sun shade)...........................4Figure 5 R8840 Physical Structure..........................................................4Figure 6 R8840 Working Principle Structure..........................................5Figure 7 Typical networking for R8840..................................................6

TablesTable 1 Mechanical Volume of R8840...................................................5Table 2 Power Consumption of R8840..................................................5Table 3 System index..............................................................................7Table 4 Transmitter index.......................................................................8Table 5 R8840 Receive Sensitivity.........................................................8Table 6 R8840 Environmental Adaptability.........................................12Table 7 R8840 Mechanical Adaptability..............................................13Table 8 R8840 EMC Indices................................................................14


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1 OVERVIEW

1.1 BackgroundThe WCDMA system is composed of radio access network UTRAN and core network CN. The base station (Node B) is an NE of the UTRAN system and located in the WCDMA system, as shown in Figure 1. It is connected with the RNC through the Iub interface and with the UE through the air interface Uu.

RNS

RNC

RNS

RNC

Core Network

Node B Node B Node B Node B

Iu Iu

Iur

Iub Iub Iub Iub

UTRAN

Figure 1 Node B in the WCDMA System

Based on the function realized, Node B can be divided into Base Band Unit and Radio Frequency Unit. Distributed Base Station is developed by this concept. This technical specification is about the Remote Radio Unit equipment (RRU) R8840 of ZTE Distributed Base Station.

Distributed Base Station equipment consists of Base Band Unit equipment (BBUB) and Remote Radio Unit equipment (RRU). It’s a kind of Base Station that can be installed flexibly and distrib-uted, as shown in figure 2.


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Figure 2 Distributed Base Station Equipment

Remote Radio Unit RRU can be connected to Base Band Unit BBUB by fiber, and BBUB is con-nected to RNC through Iub interface. Distributed Base Station is applicable to virous environmen-tal condition, and can greatly reduce operators’ CAPEX and OPEX.

1.2 Product ApplicationZTE Remote Radio Unit equipment R8840 is developed based on 3GPP R99/R4/R5 FDD proto-col. Together with ZTE baseband pool equipment, R8840 can constitute a full Node B Base Sta-tion. R8840 can also be connected to the ZTE Base Station to provide remote radio function.

ZTE R8840 is small, airproof, natural cooling radio unit that meet the requirement of outdoor in-stallation. It features small size, light weight, low power consumption and easy installation.

R8840 can be mounted on the tower, pole or wall that is close to the antenna, so that the radio sig -nal loss in the cable can be greatly reduced.

R8840 can at most support 4 carriers, 40W transmit power. It is applicable for different environ-ment condition from urban to suburb.

3G networking by ZTE distributed Base Station has the following advantages:

Reduce the operator's investment and OPEX: ZTE distributed Base Station adopts separate struc-ture. It uses small ground space and does not need a special equipment room. Therefore, the in-vestment into equipment room is decreased effectively. In addition, the power supply and trans-mission device for 2G network can be shared, which also saves the investment. ZTE RRU em-ploys DPD technology and achieves a high efficiency of 30%, leading in the industry. The very


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low overall power consumption helps the operator reduce electricity expense greatly. Besides, the RRU is installed near the antenna, saving feeder cost and radio power loss.

Support flexible services upgrade: Using horizontal board plugging mechanism, ZTE Base Band Unit is easy to expand and maintain. It supports the all-around smooth upgrade from 2G to 3G in the service ability. Through software upgrading, it supports the all-around service upgrade from R99 to R6 and even to LTE. The transmitting power of ZTE RRU can be increased from 20W to 40W. ZTE RRU can satisfy all kinds of application scenarios by supporting 1 to 4 carriers.

2 R8840 SYSTEM CONSTRUCTION

2.1 R8840 Physical StructureThe appearance of ZXWR R8840 is shown as Figure 3.

Figure 3 R8840 Mounted on the pole (without sun shade )


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Figure 4 R8840 Mounted on the pole (with sun shade)

Figure 5 R8840 Physical Structure

2.2 R8840 General StructureThe main function module of R8840 includes:

duplex filter

Transceiver Unit

Power Amplifier

The working principle of R8840 is shown below:


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Figure 6 R8840 Working Principle Structure

Functions of the main module:

Duplexer: Isolate and filter the transmitted signal and received signal, Integrate the function low-noise amplifier.

Transceiver: uplink and downlink frequency conversion of the radio signal; signal amplifying, filter, A/D, D/A;

Power Amplifier: performs signal amplifying function

2.3 VolumeTable 1 Mechanical Volume of R8840

Length Width Depth

360mm 320mm 165mm

2.4 Weight16.5 kg

2.5 Total Power ConsumptionTable 2 Power Consumption of R8840

Output power at Antenna Input Port

Power amplifier efficiency Max. Power Consumption

20W > 30% 170W

40W >30% 240W


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3 R8840 FUNCTION

3.1 Configuration FunctionR8840 supports the following functions:

2 receive channels (receive diversity) and 1 transmit channel for each R8840

1 R8840 can supports 4 carriers at maximum

Support carrier expansion

Support 4 antenna receive diversity

Support 2 antenna transmit diversity

3.2 Networking FunctionIt supports star, chain or ring networking between R8840 and Base Band Unit BBU (such as ZXWR B09 or ZXWR BBUB). Cascade grade can reach up to 8 grades in chain networking. Fig-ure 2.5 shows the typical networking between BBU and R8840.

Figure 7 Typical networking for R8840

Other functions related to networking include:

Various R8840 connected to one BBU can constitute one cell.

The maximum fiber transmission distance support by one R8840 is 10km, and the maximum fiber transmission distance supported is 40km by cascade.


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Backup function is supported for the links of R8840 interfaces when using ring networking.

3.3 Service Function Provide signal processing function. In uplink direction, radio signal is converted to base-

band signal; in downlink direction, baseband signal is converted to radio signal.

Provide Auto Gain Control controlling in uplink, stabilize the voltage of IQ signal in BBU-R8840 interface.

Provide I/Q signal frame assembling and disassembling function in BBU-R8840 interface.

Support RTWP reporting, reporting interval can be 100ms or 2ms.

Support transmit power reporting function for every carrier.

Support over loading protection function for Power Amplifier.

Support measurement, compensation and adjustment function for channel delay.

Supports transmit channel switching on/off function.

R8840 software fault in one R8840 will not affects the working of BBU and other R8840 connected to the abnormal R8840.

3.4 Other Function Support trunk Node interface

Support alarm interface for backup power

Support alarm interface for lightning protector

Support electrical tilt antenna.

Support TMA

Support non-continuous frequency configuration

4 R8840 PERFORMANCE

4.1 System IndicesTable 3 System index

Item Index

Uplink Frequency 1920MHz ~ 1980MHz

Downlink Frequency 2110MHz ~ 2170MHz

Tx/Rx frequency separation 190MHz

Channel Spacing 5MHz, 4.8MHz, 4.6MHz Optional

Channel Raster 200KHz


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4.2 Transmitter IndicesTable 4 Transmitter index

Transmit Power Number of Carriers Supported

Power per Carrier

20W 1C/2C/3C 20W/10W/7W

40W 1C/2C/3C/4C 40W/20W/13W/10W

4.3 Receive Sensitivity

Receive sensitivity is shown in Table 5

Table 5 R8840 Receive Sensitivity

Data Bit rate Base Station Receive Sensitivity （dBm） FER/BER

12.2 kbps Single antenna -123 dBm BER 0.001

5 OPERATION AND MAINTENANCE

5.1 User InterfaceBBUB provides GUI interface for O&M.

Visualize the physical equipment in O&M system and simplify user input opera-tion

Output straight and understandable information; Generate respective graphic in-terface according to actual output

5.2 Configuration ManagementR8840 provides the following functions for configuration management:

Software upgrade – online upgrade is supported; service interruption is no more than 5 minutes and the other RRU’s connected to it, if RRU cascading is adopted, it will not be affected; automatic software roll back is supported in case of up-grade failure.

Local software launch is supported.


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Software download needs less than 3 min.

Provide data configuration interface.

Support abnormal information report.

Support automatic ID configuration.

Support automatic R8840 identification and launch according to existing configu-ration.

5.3 Performance ManagementPerformance management includes:

CPU/RAM usage check

Uplink frequency scanning and interference detection

5.4 Alarm ManagementOperation and maintenance subsystem supports the following items related to alarm management:

Alarming detection and report

Over or insufficient voltage alarming of RRU power input

Alarming of lightning protection module failure

Detection and alarming of uplink and downlink failure

Over temperature alarming and protection

Detection and alarming of clock failure

Detection and alarming of link failure between BBU and RRU

Detection and alarming of tower mounted amplifier and electrical tilt antenna fail-ure

VSWR alarming

Detection and alarming of power amplifier failure

Indicator indication for important alarms such as transmission failure, feeder and antenna system failure and etc.

User defined alarms, e.g. trunk node alarms

5.5 Maintenance ManagementOperation and maintenance subsystem supports the following items related to maintenance man-agement:

Remote software reset and manual reset on RRU side. Other RRU’s connected to it, if RRU cascading is used, will not be affected.

Automatic port switch when using RRU ring


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Power amplifier opening or closure

Maintenance for electrical tilt antenna; compliant with ASIG protocol

Loop test of fiber port on RRU side

Detection of transmitting and receiving channel failure

Operation logging of RRU maintenance

Transmission latency measurement of fiber port

Frequency setting and query

Setting and query of maximum transmitting power


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6 PHYSICAL INTERFACES

R8840 interfaces include interfaces with BBU, feeder and electrical tilt antenna, RS485 port, port for trunk node and power port.

6.1 Interface Between R8840 and BBUR8840 has 2 fiber ports, either 1.25Gbps or 2.5Gbps, for connection with BBU or other R8840’s serially connected to it.

Provide path for IQ data, clock synchronization, O&M messages

Transmission distance is not less than 10 km.

Failure optical module can be replaced at site.

6.2 Interface Between R8840 and FeederBetween R8840 and the feeder are two N-type connectors, of which one is for the main antenna and the other for diversity antenna. The interface resistance is 50Ω.

6.3 Interface Between R8840 and Electrical Tilt Antenna This interface is the path of power, O&M messages between R8840 and electrical tilt antenna.

6.4 RS485 PortOne RS485 port is provided for transparent information transmission of external environment monitoring and power equipment.

6.5 Ports for Input Trunk NodesR8840 supports 2 input trunk nodes which can be used for power alarming, switch between active and standby power module and alarming of lightning protection module.

6.6 Power PortR8840 provides power ports for 220V AC and -48V DC input.


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7 ENGINEERING CHARACTERISTICS

R8840 engineering characteristics include environmental adaptability, mechanical adaptability, overall structure, cables, installation requirements, power requirements, equipment immunity, grounding requirements, EMC indices, safety regulations and environmental protection require-ments.

7.1 R8840 Environmental AdaptabilityTable 6 R8840 Environmental Adaptability

Table 6 R8840 Environmental Adaptability

Item NO Item Environmental Adaptability

1 lowest storage temperature

-40℃

2 highest storage temperature

+70℃

3 lowest working temperature

-40℃

4 highest working temperature

+55℃

5 temperature change rate

0.5 /min℃

6 humidity 10%~100% RH

7 air pressure 62kpa~106Kpa

8 smoke 5％ Nacl, 35℃

9 Degrees lf enclosure protection is provided

IP65

10 solar radiation 1120w/m2

11 noise ≤5.5bel


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7.2 R8840 Mechanical AdaptabilityR8840 mechanical design takes into consideration ease of installation and maintenance and expan-sion flexibility; it has adequate mechanical intensity, and installation is quakeproof.

Table 7 R8840 Mechanical Adaptability

Item NO Item Mechanical Adaptability

1 Mechanical vibration

2-9Hz, 1.5mm

9-200Hz, 5m/s2

2 Mechanical shock Collision wave: half-sine shock puls

Peak acceleration: 300 m/s2

Impulse width: 11ms

Shock axis: 6 directions

Shock times: 3 times in each direction

7.3 R8840 Installation Requirements With maximum configuration of 3C1S, the whole rack is less than 16.5 kg (not including

shelter, installation kits and enclosure);

R8840 complies with GR487 and can stand wind of 67m/s;

R8840 supports pole and wall-mounted installation;

The intensity of R8840 installation kits comply with GB4943;

Installation and maintenance are independent and will not affect each other when several R8840 are installed simultaneously

7.4 Power Supply-48V DC and 220V AC input are supported.

Overcurrent protection is available for -220V AC input.

Reverse polarity protection and overcurrent protection are available for -48V DC input.

7.4.1 220V AC InputWorking voltage: 200V~240V

Allowed range: 90V~300V

Frequency range: 45~65Hz


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7.4.2 -48V DC InputWorking voltage: -48V

Allowed range: -38V~-57V

7.5 Protection RequirementR8840 needs external lightning protection box.

AC port complies with Level C lightning protection requirement. Rated currency is 20kA (8/20us wave) with external lightning arrester;

DC port complies with Level C lightning protection requirement. Rated currency is 20kA (8/20us wave) with external lightning arrester;

Signal and control port immunity: Rated currency is 5kA (8/20us wave);

Feeder port immunity: Rated currency is 10kA (8/20us wave).

7.6 Grounding RequirementBBUB should have reliable grounding system and the grounding resistance should be no more than 10Ω.

BBUB should have reliable connection with grounding system. Grounding cable should be copper bundles with cross section not less than 16mm2.

Antirust and anticorrosion measures should be taken for connections with the grounding system.

7.7 R8840 EMC IndicesTable 8 R8840 EMC Indices

Item NO

Item Criteria

1 RE (optional) and CE test

CISPR22 Class B

2 Radiated spurious emissions

Frequency range Power limit (e.r.p)/reference bandwidth

30 MHz≤f＜1000 MHz -36dBm/100kHz

1 GHz≤f＜12.75 GHz -30dBm/1MHz

Fc1-12.5 MHz ＜ f ＜Fc2+12.5 MHz

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Remarks:

Fc1：center frequency of the lowest spectrum


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Fc2：center frequency of the highest spectrum

3 Harmonic test Product category A of IEC 61000-3-2

4 Flicker test Product category A of IEC 61000-3-3

5 ESD test Contact discharge: ±6kV; Air discharge: ±8kV

Comply with performance criterion B

6 EFT test DC Power port: ±2kV; AC Power port: ±2kV; Signal port: ±1kV ; Feeder port: ±2kV


7 SURGE test AC power port: Differential mode 4kV; Common mode: 6kV

DC power port: Common mode: 2kV


8 RS test 10V/m

Comply with performance criterion A

9 CS test 3V

Comply with performance criterion A

10 AC DIP Comply with DIP criterion of IEC61000-4-11

7.8 Safety RequirementR8840 complies with GB4943-2001, Safety of information technology equipment, and IEC-60950-1 Information Technology Equipment - Safety.

7.9 Environmental Protection RequirementR8840 complies with RoHS & WEEE


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Documents

ZXWR R8840 Technical Specification V3.22