2.3 zxsdr bs8700 product description

Volume IV Section 2 Chapter 2.3
ZXSDR BS8700 Product Description


ZXSDR B8700 Product Description

Version Date Author Approved By Remarks

V4.1 2011-01-15

© 2010 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.

ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. I


TABLE OF CONTENTS

1 Overview 1

2 Product Highlights..................................................................................................................... 3

3 Functionality............................................................................................................................... 4
3.1 Basic Functions........................................................................................................................ 4
3.2 Service Functions..................................................................................................................... 5

4 System Architecture.................................................................................................................. 7
4.1 Product Physical Structure....................................................................................................... 7
4.2 Hardware Architecture............................................................................................................. 8
4.3 Software Architecture............................................................................................................. 22
4.4 External Interface.................................................................................................................. 23

5 Technical Indices..................................................................................................................... 25

6 Operation and Maintenance.................................................................................................... 27

7 Configuration Principles.......................................................................................................... 30
7.1 Baseband Unit Configuration Principles.................................................................................30
7.2 Radio Unit Configuration Principles........................................................................................ 30
7.3 GSM Single Mode Configuration Principles...........................................................................31
7.4 UMTS Single Mode Configuration Principles.........................................................................31
7.5 GSM/UMTS Dual Mode Configuration Principles...................................................................32

8 Acronyms and Abbreviation................................................................................................... 34

36

II © 2011 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary


FIGURES

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Conventional GSM/EDGE/UMTS Network System.....................................................................1

ZTE SDR BS Composed GSM/UMTS Network............................................................................1

Networking Diagram (B8200, RNC/BSC and RRU).....................................................................2

In chain and loop networking mode, 4 RRU can be maximally cascaded and the maximal
distance is 100 Km; The maximal distance between BBU and first RRU can reach 40 Km.
Usually it’s kindly suggested no more than 10 Km....................................................................2

Example of ZXSDR BS8700 Physical Structures........................................................................7

BS8700 Hardware Structure ........................................................................................................ 8

Baseband Unit of BS8700............................................................................................................. 9

CC Panel 10

UBPG Panel................................................................................................................................. 11

BPC Panel 11

FS Panel. 12

SA Panel 13

SE Panel 14

NIS Panel. 14

PM Panel 15

FAM Panel 16

R8840 Physical Appearance....................................................................................................... 17

R8840 External Interfaces.......................................................................................................... 17

R8860/R8860E Physical Appearance......................................................................................... 18

R8860/R8860E External Interfaces............................................................................................. 19

R8880 Physical Appearance....................................................................................................... 20


R88890 Physical Appearance..................................................................................................... 21


BS8700 Software Structure........................................................................................................ 23

NetNumen M31 Elements Management System.......................................................................27

IV © 2011 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary


TABLES

Mechanical Sizes of ZXSDR BS8700........................................................................................... 7

Main Board List of Baseband Unit............................................................................................... 9

Table of CC Panel Interfaces...................................................................................................... 10

Table of FS Panel Interfaces ..................................................................................................... 12

Table of SA Panel Interfaces...................................................................................................... 13

Table of SE Panel Interfaces ..................................................................................................... 14

Table of NIS Panel Interfaces..................................................................................................... 14

Table of PM Panel Interfaces ..................................................................................................... 15

R8840 External Interface............................................................................................................ 17

Description of External interfaces............................................................................................. 19



Description of ZXSDR BS8700 External Interfaces..................................................................24

ZXSDR BS8700 Technical Indices............................................................................................. 25

ZXSDR BS8700 Configuration for GSM Single Mode (Multi-carrier).......................................31

ZXSDR BS8700 Configuration UMTS Single Mode (R8840/R8880).........................................31

ZXSDR BS8700 Configuration UMTS Single Mode (R8860/R8860E).......................................32

ZXSDR BS8700 Configuration UMTS Single Mode .................................................................32

BS8700 Configuration for G/U Dual-Mode (Same Spectrum)..................................................32

BS8700 Configuration for G/U Dual-Mode (Different Spectrums)..........................................33

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1 Overview
In general, GSM/EDGE/UMTS system consists of Core Network (CN), Radio Network
(GERAN/UTRAN) and Mobile Station/User Equipment (MS/UE). GERAN/UTRAN
includes 2 network elements, base station and BSC/RNC. The conventional 2G/3G BS
connects to BSC/RNC via Abis/Iub interface. Figure 1 shows a conventional
GSM/EDGE/UMTS network system.

2G BSS Only MGW MSCS
GSM MS
PSTN

BS BSC

3G UTRAN Only

Node B
HLR
RNC
UMTS UE
RNC

IP Network
Node B
SGSN GGSN

Figure 1 Conventional GSM/EDGE/UMTS Network System

In Figure 1, GPRS/EDGE and UTRAN are two separated radio networks. When ZTE
2G/3G dual-mode base station is introduced, the 2G/3G radio networks will be
converged into one and this will decrease the network construction cost greatly. The
GSM/UMTS integrated network is shown in the following Figure 2.

SDR BS flexibly configured as a GSM MGW MSCS
and UMTS system with only software
configuration
PSTN
Software Defined Radio
GSM MS for both G/U systems

SDR BS
HLR
BSC/RNC
BSC/RNC
UMTS UE

IP Network
SDR BS
SGSN GGSN

Figure 2 ZTE SDR BS Composed GSM/UMTS Network

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The purpose of this document is to describe the new-generation distributed Software
Defined Radio (SDR) base station – ZXSDR BS8700 (hereafter BS8700), which consists
of the core BBU (B8200) and series RRUs. BS8700 is based on the ZTE unified
MicroTCA platform and adopting MCPA technology radio part, to be the new type of ZTE
mobile BS. This revolutionary BS platform supports all kinds of wireless access
technology including GSM, UMTS, CDMA2000 WiMAX and LTE.

ZXSDR BS8700 can be divided into different types of distributed BS through connecting
with different RRUs, according to different networking modes and coverage scenarios.

• B8200+R8860/R8860E: Dual mode macro distributed base station, mainly used for outdoor
and indoor GSM/UMTS dual mode coverage.

• B8200+ R8840/R8880/R8890: UMTS mode macro distributed base station, mainly used for
outdoor and indoor UMTS mode coverage.

B8200 provides Iub/Abis interfaces with several types of physical interface such as
E1/T1, STM-1, FE and GE to connect with RNC/BSC and CPRI interfaces to connect
with RRUs. B8200 supports IP transmission and hybrid transport. B8200 provides at
most 12 pairs of CPRI optical interfaces to RRUs.

B8200 and RRU can support star, chain and mixed networking. In star networking, 12
optical interfaces can connect to 12 RRUs. In chain networking, RRU can cascade up to
4 levels.

The networking diagram including B8200, RNC/BSC and RRU is shown in Figure 3.

FE/GE

Figure 3 Networking Diagram (B8200, RNC/BSC and RRU)

In chain and loop networking mode, 4 RRU can be maximally cascaded and the maximal
distance is 100 Km; The maximal distance between BBU and first RRU can reach 40
Km. Usually it’s kindly suggested no more than 10 Km.

2 © 2011 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary


In the following chapter, a general description will be given to GSM/UMTS dual mode
Base Station – ZXSDR BS8700.

2 Product Highlights
ZXSDR BS8700 (hereafter BS8700) is the multi-carrier, dual-mode distributed base
station of ZXSDR BS series. By adopting advanced MicroTCA platform and SDR
technology, BS8700 can support GPRS/EDGE/E-EDGE and UMTS/HSPA/HSPA+
simultaneously. In the future evolution to LTE, only change baseband processing board
and software upgrade. Its main advantage is the flexibility which brings the possibility to
support GSM and UMTS on a single base station.

Compared with traditional base station, ZXSDR BS8700 has following highlight features:

• Series RRUs, suitable for multi indoor and outdoor coverage scenarios.
Series RRUs with high output power, including R8840, R8860/R8860E, R8880 and
R8890.

• RRU - Compact Design, Light, Easy Installation
RRU (R8840) is only 19 liters in volume and 16.5kg in weight under typical power
output. It can be mounted on the pole, the wall, the tower top, etc. Natural cooling
without fan. No dedicated equipment space is required, easy for site selection, fast
network deployment.

• RRU – Installed Near Antenna, Saving Feeder Loss, Enhancing Coverage
Series RRU can be remotely installed near the antenna system to lower the feeder
loss. The coverage gain can reach more than 3dB compared with traditional macro
base station.

• BBU - Plug-in Design for Shelf, Zero Footprint, Convenient Deployment
B8200 adopts Plug-in design with 19 inch, 2U in height and 8.75 kg in weight. It can
be conveniently mounted on the wall, ground, or in the 19 inch rack, etc.

• Shared Baseband Resources, Dynamic Traffic Adjustment
Suitable for traffic transferring dynamically or outburst areas, such as CBD, uptown
or beauty spots, avoiding resources waste.

• Various Interfaces, Flexible Networking
ATM/IP dual protocol stacks, providing with various interfaces such as E1/T1/STM-
1/GE etc. It supports SDH networking, hybrid transmission and all-IP networking.

• G/U dual-mode Configuration, Smoothly Evolve to Future Network
Supports GSM/GPRS/EDGE/ E-EDGE/UMTS/HSPA/HSPA+.

• Multi-Carriers and Multi-Frequencies



R8860/R8860E has the capability to support 6 GSM TRX or 4 UMTS carriers. If
GSM and UMTS are configured at the same spectrum, each radio unit supports 4
GSM TRX + 1 UMTS carrier.

3 Functionality

3.1 Basic Functions
BS8700 supports the following basic functions on Um/Uu, Abis/Iub and O&M interfaces.

• On Um/Uu interface, BS8700 supports UE access and radio link transmission including RF
processing, channel coding and decoding, channel multiplexing and de-multiplexing,
measuring and reporting, power control, transmit diversity, receiving diversity, calibration and
synchronization.

• Via Abis/Iub interface, BS8700 connects with BSC/RNC and supports the following functions
including cell management, BS measurement information report, system Information
broadcast, access control implementation from BSC/RNC, mobility management, radio
resource management and control, FP process and ATM transmission management.

• On operating and maintenance interface, BS8700 provides system management functions
including configuration management, alarm management, status check and system monitor.

Besides, BS8700 provides following functions:

• Supports GSM Phase I/GSM Phase II/GSM Phase II plus standards.

• Supports 3GPP R99, R4, R5, R6, R7, R8.

• Supports GSM/UMTS 900MHz, EGSM 900MHz, GSM/UMTS 850MHz GSM/UMTS
1800MHz, GSM/UMTS 1900MHz, UMTS 2100MHz.

• BS8700 supports GSM channel spacing at least 200KHz, and supports UTMS working on
bandwidth at least 3.8MHz and WCDMA/LTE 20MHz.

• Supports socket-independent board’s installation to support different frequencies in the same
cabinet.

• Supports CS1~CS4 of GPRS, MCS1~MCS9 of EDGE.

• Supports reduced TTI, fast ACK/NACK reporting, MS receive diversity, downlink dual carriers
and EGPRS2-A of E-EDGE.

• Supports dynamically changing channel coding according to monitoring and measurement
results.

• Supports space diversity, frequency diversity, time diversity, polarization diversity and
maximum ratio combination diversity.



• The receiving part adopts Viterbi algorithm for coding to improve Channel decoding capability
and system receiving sensitivity.

• Supports frequency hopping.

• Supports DTX sending and decreasing transmitting power, lowering the total interference in
the air.

• Supports common BCCH; different carriers can be used for different services and they share
the same BCCH.

3.2 Service Functions
BS8700 supports the following services:

• GSM/GPRS/EDGE/E-EDGE:

− FR: Full Rate voice service

− EFR: Enhanced Full Rate voice service

− HR: Half Rate voice service

− AMR: Adaptive Multi Rate voice service

− F9.6: 9.6Kbit/s CS domain data service

− GPRS/EDGE/E-EDGE

• Location service:

− Support Cell ID, Cell ID+RTT and AGPS location services

• R99 service:

− CS domain service: 8 Kinds of AMR voice service, CS 64Kbps

− PS domain service: UL/DL 64Kbps, UL/DL 128Kbps, UL/DL 384Kbps

− Concurrent service: CS domain (AMR 12.2Kbps, CS 64Kbps) + PS domain
(64Kbps, 128Kbps, 384Kbps)

• HSDPA Service:

− Support Data rate 14.4Mbps

− Support 15 codes

− Support HSDPA and R99 on both independent and shared carriers



− Support intra-frequency, inter-frequency handover and handover between
HSDPA and R99

− Support concurrent services

− Support streaming services

• HSUPA Service:

− Supporting 5.76Mbps uplink data rate

• MBMS Service:

− Support broadcast and multicast functions, multicast supports PtP and PtM

− Support mobility management

− Support streaming, background MBMS services

• HSPA+ Service:

− 21.6Mpbs Downlink data with 64QAM

− 28.8Mpbs Downlink data with 16QAM + 2*2 MIMO

− 43.2Mpbs Downlink data with 64QAM + Dual Cell combination



4 System Architecture

4.1 Product Physical Structure
ZXSDR BS8700 consists of the BBU (B8200) and series of RRUs. The physical
structures of ZXSDR BS8700 in different combinations are shown in Figure 4:

Figure 4 Example of ZXSDR BS8700 Physical Structures

Mechanical sizes of ZXSDR BS8700 in different combinations are shown in following
Table 1 .

Table 1 Mechanical Sizes of ZXSDR BS8700

Mechanical Size Height Width Depth Weight (Kg)
(mm) (mm) (mm)
B8200 88.4 482.6 197 8.75
R8840 370 320 160 16.5
R8860/R8860E 370 320 197 20
R8880 420 340 140 20
R8890 385 452 155 28



4.2 Hardware Architecture
BS8700 hardware architecture is shown in Figure 5.

Baseband Unit Antenna

BB
(UBPG
/BPC) CPRI
RRU
FS

E1 Radio Unit
SA/
STM-1 SE/
NIS CC
RF Unit
GE/FE

Control Signaling
Clock
Data

Figure 5 BS8700 Hardware Structure

The BBU of ZXSDR BS8700 can be configured in GSM/UMTS single mode and G/U
dual-mode. It supports up to 30 CS in UMTS single mode, providing 1920 CE base-band
processing capability DL/UL separately, up to 60 TRX in GSM single mode.

There are 4 kinds of ZXSDR BS8700 RRUs:

• R8840 – 2 receiving paths and 1 transmitting path (1T2R). Each one can support 1
sector in UMTS on 2100MHz/AWS. Its output power achieves 60W (TOC). It is
mainly used for outdoor macro coverage and also used for indoor coverage signal
source. R8840 can support 3 carriers when it ensures 20W output power for each
carrier.

• R8860/R8860E – 2 receiving paths and 1 transmitting path (1T2R). Each one can
support 1 sector in GSM/UMTS on 850/900/1800/1900MHz. Its output power
achieves 80W (TOC). It is mainly used for outdoor macro coverage and also used
for indoor coverage signal source. R8860/R8860E can support 4 carriers when it
ensures the 20W output power for each carrier.

• R8880 – 2 receiving paths and 2 transmitting paths. Each one can support 2*2
MIMO in HSPA+ mode on 2100MHz. Its output power achieves up to 2*60W (TOC).
It is mainly used for outdoor macro coverage and also used for indoor coverage
signal source. R8880 can be configured as UMTS mode. R8880 can support 3
carriers when it ensures the 2*20W output power for each carrier.

• R8890 – 6 receiving paths and 3 transmitting paths (3T6R). Each one can support 3
sectors in UMTS mode on 2100MHz. Its output power achieves up to 3*60W (TOC).



It is mainly used for outdoor macro coverage and also used for indoor coverage
signal source. R8890 can support 3 carriers 3 sectors when it ensures 20W output
power for each CS.

4.2.1 Baseband Unit
Baseband unit in BS8700 is responsible for processing the baseband signals.

FSS UBPG/BPC
PM
FAM

SA

CC

Figure 6 Baseband Unit of BS8700

The Baseband unit consists of control & clock board, fabric switch board, baseband
processing board, site alarm board (optional), site alarm extension board, network
Interface of STM-1 board (optional), power module, and fan module.

Table 2 Main Board List of Baseband Unit

Board Name Function Description
CC Control & Clock Board
FS Fabric Switch Board
UBPG Universal Baseband Processing board for GSM
BPC Base band Processing Board Type C for UMTS
SA Site Alarm Board
SE Site alarm Extension Board
NIS Network Interface of STM-1 Board
PM Power Module
FAM FAN Module

4.2.1.1 Control & Clock Board (CC)

CC is control and clock board, used for control and management of baseband unit,
providing Ethernet and system clock. The CC panel is illustrated in Figure 7.



Figure 7 CC Panel

Description of CC panel interfaces is shown in Table 3 .

Table 3 Table of CC Panel Interfaces

Interface Name Description
ETH0 Ethernet interface between BS8700 and BSC/RNC, adapting interface of
10M/100M/1000M.
ETH1 Ethernet interface used for cascading, debugging or local maintenance,
adapting interface of 10M/100M/1000M.
TX/RX Used for Ethernet interface connection between BS8700 and BSC/RNC. This
interface is 100M/1000M Ethernet optical interface.
EXT External communication port, connected to external receiver,
Mainly 485、PP1S+/2M+ interfaces.
REF External connection GPS antenna, SMA(F) interface

Control & clock board functions are as follows:

• Ethernet switching function, implementing data switching for service and control flow within
the system

• Abis/Iub interface protocol processing

• Monitoring, controlling and maintaining of the base station system, providing LMT interface

• Managing software versions of boards and programmable components, and supporting local
and remote software upgrade

• Supervising the running status of each board within the system

• Synchronizing with various external reference clocks, including the Abis/Iub interface
recovery clock, the GPS clock and the clock provided by BITS; The CS can select one
according to the actual configuration.

• Generating and delivering the clock signal demanded by each part

• Providing GPS receiver interface and managing the GPS receiver

• Providing a real-time clock for system operation and maintenance; the real-time clock can be
calibrated

• The board power interface (-48V, -48V ground, protection ground, digital ground) has reverse
connection protection function

• Reading various hardware management marks in the system, including the rack number,
backplane type number, slot number, board function type, board version, and board function
configuration mark

• Supporting Control & Clock boards load sharing or primary/slave switchover. The load
sharing and primary/slave switchover mode can be set by software configuration.



4.2.1.2 UBPG Board

UBPG is the GSM baseband processing board. It processes the physical layer protocol
and frame protocol specified by 3GPP. UBPG panel is illustrated in Figure 8.

Figure 8 UBPG Panel

UBPG main function as follows:

• Achieving rate adaptation, channel coding, interleaving, encryption, generate TDMA shock
burst, GMSK/8PSK modulation, IQ baseband digital signals output.

• Achieving uplink IQ data receiving, receiver diversity combiner, digital demodulation
(GMSK&8PSK, equilibrium), decryption, deinterleaving, demodulator, rate adaptation, GE
Ethernet interface transmit it to CC board for processing.

• Radio link synchronization, transmission frame processing

• Measuring parameters required in power control and handover

• Diversified transmission and receiving

• Communicating with CS via Ethernet interface

• Reading all the hardware management identifiers, including the backplane type number, slot
number, board function type, board version, board function configuration identifier, and the
CPU serial number.

4.2.1.3 BPC Board

BPC is the UMTS baseband processing board. It processes the physical layer protocol
and frame protocol specified by 3GPP. BPC panel is illustrated in Figure 9.

Figure 9 BPC Panel

BPC hasn’t external interface, its main function as follows:



• Achieving downlink baseband signal processing, including downlink data coding,
multiplexing, rate adaptation, channel mapping, spread spectrum an d scrambling
power regulation and channel compositing.

• Achieving uplink baseband signal processing, including uplink data RAKE receiving,
demodulator, transmitting the data to lub interface for processing.

• Downlink data coding/multiplexing, rate matching, channel mapping, spreading and
scrambling, power adjusting, and channel compositing.

• Uplink signal RAKE receiving and channel decoding

• Radio link synchronization and Frame processing

• Measuring parameters required in power control and handover

• Softer handover and carrier diversity.

• Communicating with the CS via the Ethernet interface

• Reading all the hardware management identifiers, including the backplane type number, slot
number, board function type, board version, board function configuration identifier, and the
CPU serial number

4.2.1.4 Fabric Switch Board (FS)

FS is fabric switch board which provide baseband optical interface between BBU and
RRU and process the IQ signal, and provide CPRI interfaces to connect with RRUs. FS
panel is illustrated in Figure 10.

Figure 10 FS Panel.

Description of FS panel interfaces

Table 4 Table of FS Panel Interfaces

TX0 RX0 TX5 RX5 6 pairs optical interfaces, connected to RRU
～

The FS has the following functions:

• Receive the signal from the rear board in the downlink and retrieve the data and timing.



• Multiplex the received data and retrieve I/Q signal

• I/Q mapping in the downlink and multiplex I/Q signal to the optical signals.

• Receive the I/Q in uplink and demultiplex/mapping into I/Q signal

• The multiplexed I/Q signal transmit to BP

• Exchange CPU interface signaling through HDLC interface with RU module

• MicroTCA protocol based module management function

4.2.1.5 Site Alarm Board (SA)

SA is a site alarm board, illustrated in Figure 11.

Figure 11 SA Panel

• Description of SA panel interface is shown in Table 5.

Table 5 Table of SA Panel Interfaces

8 E1/T1 interfaces,
- 1 RS485,
1RS232 interface,
6+2 dry contacts ( 6 input interfaces, 2 input&output interfaces )

The SA has the following functions:

• Provide E1/T1 transmission interfaces for Iub.

• Provide site alarm monitoring interfaces.

• Provide FAM's alarm and rate control.

4.2.1.6 Site alarm Extension Board (SE)

SE is site alarm extension board, and SE panel is illustrated in Figure 12.



Figure 12 SE Panel

Description of SE panel interfaces is shown in Table 6.

Table 6 Table of SE Panel Interfaces

8 E1/T1 interfaces,
- 1 RS485,
1RS232 interface,
6+2 dry contacts ( 6 input interfaces, 2 input&output interfaces )

SE shares the bottom-right slot with UBPG/BPC and has the following functions:

• Provide E1/T1 transmission interfaces for Iub.

• Provide site alarm monitoring interfaces.

It is used to extend the port number if SA can not fulfill the requirements.

4.2.1.7 Network Interface of STM-1 board(NIS)

NIS is STM-1 network interface board, and NIS panel is illustrated in Figure 13.

Figure 13 NIS Panel.

Description of NIS panel interfaces is shown in Table 7.

Table 7 Table of NIS Panel Interfaces

- 2 STM-1

The NIS has the following functions:



• 2 STM-1fiber interfaces, support spending processing, mapping and mapping solutions,
space-division overlapping, support 21 E1 or 28 T1 most greatly to the STM-1 mapping.

• Support the ADM/TM working.

• Support the AU3/AU4 mapping way.

• Support the APS protection function.

4.2.1.8 Power Module (PM)

PM is power module, and PM panel is illustrated in Figure 14.

Figure 14 PM Panel

Description of PM panel interface is shown in Table 8 .

Table 8 Table of PM Panel Interfaces

MON Debugging interface, RS232 interface
-48V/-48VRTN -48V input

The PM has the following functions:

• 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/under-voltage;

• Output over-current protection and load power management.

4.2.1.9 Fan Array Module (FAM)

FAM is fan array module which panel is illustrated in Figure 15.



Figure 15 FAM Panel

The FAM main functions are as follows:

• System temperature monitor and control;

• Monitor, control, and report of fan state.

4.2.2 Radio Unit

Radio unit main process the conversion between baseband signals and RF signals.

In the BS8700, radio unit has four kinds, respectively are: R8840, R8860/R8860E,
R8880 and R8890. R8840 is the UMTS only radio frequency module, which works in
UMTS on 2100MHz. R8860/R8860E is the multi-carrier radio frequency module, which
can work in GSM only, UMTS only or G/U dual mode via software configuration. R8880
is the UMTS only radio frequency module, and each module supports 2*2 MIMO in
UMTS mode on 2100MHz. R8890 is UMTS only radio frequency module, which support
3 sectors on 2100MHz. The following will show the details.

In the BS8700, CFR(Crest Factor Reduction)algorithm, DPD(Digital Pre-Distortion)
algorithm and Advanced-Doherty PA technique are adopted to improve PA linearity and
EVM/RCDE performance, the output power is not affected by modulation mode.

4.2.2.1 R8840

R8840 is a UMTS multi-carrier radio unit, working on 2100MHz/AWS, supporting
upgrade to LTE via software upgrade. R8840 supports maximum 4 carriers, the output
power is 60W. R8840 module consists of MCPA (multi-carrier power module) module,
transceiver module, duplex filter LNA and RPWAC/DC (Power for AC or DC). There are
one TX/RX port and one RX port for connecting antenna. R8840 employs compact
cabinet design, as shown in Figure 16. Dimension of R8840 is 370×320×160mm
(H×W×D).



Figure 16 R8840 Physical Appearance

The external interfaces of R8840 system are integrated at the bottom of the equipment,
as shown in Figure 17. The interface description is shown in the following table.

Figure 17 R8840 External Interfaces

Table 9 R8840 External Interface

S.N. Label Interface Interface Type / Connector
1 LC1 BBU and RRU Interface LC-mode optical interface (IEC 874)
/RRU cascading interface
3 AISG AISG interface 8-core aerial socket (IEC 60130-9-ED)
4 Monitor External device interface 37-pin aerial socket
5 PWR Power supply interface AC interface: Connector
XCE18T3K1P1-02+FJJP1-7.5
Cable section area: 3*1mm2
DC interface: Connector
XCG18T4K1P1-01+XC18FJJP1-10.5



Cable section area: 4*1.5mm2
6 RX Interface to receive diversity 50 Ω N-mode connector
RF cable
7 RX/TX Interface to transmit / receive 50 Ω N-mode connector
main diversity RF cable
8 RXout Frequency extension N-KY (MIL-C-39012 or IEC169-16)
interface
9 RXin Frequency extension N-KY (MIL-C-39012 or IEC169-16)
interface
10 GND Equipment grounding Cable section area: 16mm2

4.2.2.2 R8860/R8860E

R8860/R8860E is multi-carrier RF module, working on 850/900/1800/1900MHz,
supporting upgrade to LTE via software upgrade. R8860/R8860E can be configured as
GSM only, UMTS only or mixed mode module. R8860/R8860E can be configured to 1 to
6 TRX in GSM mode. In case of GMSK modulation, 80W TOC output power can be
provided. If R8860/R8860E is used as UMTS mode, it can support 4 carriers with 80W
TOC output power. In mixed mode, R8860/R8860E can support 4 GSM TRX and 1
UMTS carriers or 2 GSM TRX and 2 UMTS carriers.

R8860/R8860E module consists of MCPA module, transceiver module, and duplex filter
LNA. There are one TX/RX port and one RX port for connecting antenna.
R8860/R8860E employs compact cabinet design, as shown in Figure 18. Dimension of
R8860/R8860E is 370×320×197 mm (H×W×D).

Figure 18 R8860/R8860E Physical Appearance

R8860/R8860E external interface locates at the bottom of the cabinet, as shown in
Figure 19. The interface description is shown in Table 10.



Figure 19 R8860/R8860E External Interfaces

Table 10 Description of External interfaces

4 Mon External device interface 37-pin aerial socket
5 PWR Power supply interface DC interface:
Connector XCG18T4K1P1-
01+XC18FJJP1-10.5
Section area of cable is 4*1.5mm2
6 RX Interface to receive diversity 50 Ω DIN-mode connector
RF cable
7 RX/TX Interface to transmit / receive 50 Ω DIN-mode connector
8 RXout Frequency extension N-KY (MIL-C-39012 or IEC169-16)
interface
9 RXin Frequency extension N-KY (MIL-C-39012 or IEC169-16)
interface

4.2.2.3 R8880

R8880 is a multi-carrier RF module. R8880 can be configured as UMTS mode,
supporting upgrade to LTE via software upgrade. It can process 2 received signals and 2
transmitted signals. Each one can support 2*2 MIMO in HSPA+ mode on 2100MHz. Its
output power achieves up to 2*60W (TOC). It is mainly used for outdoor macro coverage
and also used for indoor coverage signal source. R8880 can be configured as UMTS
mode. R8880 can support 3 carriers when it ensures the 2*20W output power for each
carrier.



R8880 employs compact cabinet design, as shown in the following figure. R8880 is 420
×340×140 mm (H×W×D) and 20Kg in weight.


R8880 external interface locates at the bottom of the cabinet, as shown in the following
figure. The interface description is shown in the following table.

1 2 3 4 5

6 7 8



1 OP1 BBU and RRU Interface LC-mode optical interface (IEC 874)
2 OP2 BBU and RRU Interface LC-mode optical interface (IEC 874)



01+XC18FJJP1-10.5
6 ANT1(TX1/RX1) Interface to transmit/receive 50 Ω DIN-mode connector
diversity RF cable
7 ANT2(TX2/RX2) Interface to transmit / receive 50 Ω DIN-mode connector
diversity RF cable

4.2.2.4 R8890

R8890 is a multi-carrier RF module. R8890 can be configured as UMTS mode,
supporting upgrade to LTE via software upgrade. It processes 6 received signals and 3
transmitted signals. Each one can support 3 sectors in UMTS mode on 2100MHz. Its
output power achieves up to 3*60W (TOC). It is mainly used for outdoor macro coverage
and also used for indoor coverage signal source. R8890 can support 3 carriers 3 sectors
when it ensures the 20W output power for each carrier.

For the available time of R8890, please refer to <ZTE GSM&UMTS Roadmap>.

R8890 employs compact cabinet design, as shown in the following figure. R8890 is 385
×452×155mm (H×W×D) and 28Kg in weight.


R8890 external interfaces locate at the bottom of the cabinet, as shown in the following
figure. The interface description is shown in the following table.





RF cable
RF cable
9 RX/TX Interface to receive diversity 50 Ω DIN-mode connector
RF cable
10 RX Interface to transmit / receive 50 Ω DIN-mode connector
01+XC18FJJP1-10.5

4.3 Software Architecture
The software system of BS8700 consists of operating support layer and application
layer.



Figure 24 BS8700 Software Structure

The operating support layer provides the functions of OAM, DBS, BRS, BRACS, and
SCS to serve different base station mode.

• OAM (Operating and Maintenance) provides the configuration, alarm and
performance measurement function.

• DBS (Data Base Sub-system) provides the database function.

• BRS (Bearer Sub-system) provides protocol stack processing function.

• BRACS (Bearer Access Control Sub-system) provides the function of access
control on bear layer.

• SCS (System Control Sub-system) provides functions of power control/supply and
active/standby switching.

Operation Support Sub-system is the support layer in this framework, which is a
hardware independent platform for running software and providing basic functions like
scheduling, timer, memory management, communication, sequencing control,
monitoring, alarming and logging.

BSP (Board Support Package) supports the information routing to the GSM, UMTS, LTE
and common parts in the application layer.

4.4 External Interface
ZXSDR BS8700 has abundant external interfaces which are described in Table 3.



Table 13 Description of ZXSDR BS8700 External Interfaces

Interface Standard
Interface Item Index
Type
ITU G.957
STM-1 2 (optional) SFP (LC)
ITU G.707
E1/T1 16 (8pairs optional) DB44 ITU G.703/G.704
1 (10M/100M/1000M
electrical) 10/100/1000BASE-T IEEE
Abis/Iub RJ45
Auto-Negotiation 802.3 compatible
Auto-MDI/MDIX
Ethernet
1000BASE-LX IEEE 802.3
1 (1000M optical) or compatible
SFP (LC)
1 (100M optical) 100BASE-FX IEEE 802.3
compatible
GPS Antenna Interface
Clock GPS 1 SMA
NMEA 0183 V3.0

Baseband Dry 6 (Input),
DB44 -
Monitor & Contacts 2 (Input / Output)
Alarm RS485 1 DB44 -
Dry
RF Monitor & 4 per RRU DB15 -
Contacts
Alarm
RS485 1 per RRU DB15 -



5 Technical Indices
Table 14 ZXSDR BS8700 Technical Indices

Type Item Indices
R8840 2100 MHz/AWS
Working R8860/R8860E 850/900/1800/1900 MHz
Frequency R8880 2100 MHz
R8890 2100 MHz
Max Carrier/Sector 30 CS (UMTS single mode)
Max Carrier/TRX 60 TRX (GSM single mode)
Max Channel Element for UL: 960/1920 CE
UMTS DL: 960/1920 CE
Capacity
Max Channels
123
Performance Per Cell for UMTS
Indices UL: 86.5 Mbps
Max Throughput
DL: 324 Mbps
RRU Type Output Power (TOC)
R8840 60W
Output
R8860/R8860E 80W
Power
R8880 2*60W
R8890 3*60W
-113dBm@GSM Single Antenna
Receiving
-126.5dBm@UMTS single antenna
Sensitivity
-129.2dBm@UMTS double antennas
B8200 -48V DC (-57VDC ~ -40VDC)
Power
R8840 -48V DC (-60VDC ~ -35VDC)
Power supply,
voltage 220 V AC (90VAC ~ 300VAC)
Indices range of 110 V AC (85VAC ~ 135VAC)
variation R8860/R8860E -48V DC (-57VDC ~ -37VDC)

R8880/R8890 -48VDC (-60 V DC~ - 37VDC)
220VAC (165VAC~ 300VAC)
110VAC (85VAC ~ 135VAC)
Power UMTS single Type Typical Power
Consumption mode Consumption (W)
Indices B8200 6CS/1 BPC 80
B8200 12CS/2 BPC 115
B8200 18CS/3 BPC 150
B8200 24CS/4 BPC 185
R8840 1C/TOC 20W 100
R8840 2C/TOC 40W 125
R8840 3C/TOC 60W 160



R8880 S1/TOC 20W 100
R8880 S2/TOC 40W 135
R8880 S3/TOC 60W 165
R8890 S111/TOC 3*20W 210
R8890 S222/TOC 3*40W 315
R8890 S333/TOC 3*60W 405
R8860/R8860E S1/TOC 20W 185
GSM Single
R8860/R8860E S2/TOC 40W 195
Mode
R8860/R8860E S4/TOC 80W 215
G/U Dual- R8860/R8860E 4G1U/TOC
215
Mode 4*15W (GSM)+20W (UMTS)
Temperature BBU:
-20°C +55°C
～
RRU:
R8840/R8860/R8860E/R8880: -40°C +55°C
～
R8890: -40°C +50°C
～
Environment Relative BBU:
Indices Humidity 5% 95%
～
RRU:
R8840/R8860/R8860E: 5% ~ 100%
R8880/R8890: 10% ~ 100%
Waterproof BBU: IP20
/Dustproof RRU: IP65
Ground ≤5Ω
YD/T 1595.2-2007
National/ ETSI EN 301 489-01, ETSI EN 301 489-23
EMC Indices International ETSI EN 300 386–V1.3.2
Standard (CISPR22) Class B
Directive 1999/5/EC (R&TTE)
BBU: ≥233,000 hours
R8840: ≥420,000 hours
MTBF R8860/R8860E: ≥380,000 hours
R8880: ≥322,000 hours
R8890: ≥280,000 hours
BBU: 0.5 hours
MTTR
RRU: 1 hours
Availability BBU: ≥99.999785%
Reliability
Indices R8840: ≥99.999762%
R8860/R8860E: ≥99.999868%
R8880: ≥99.999689%
R8890: ≥99.999643%
Down BBU: ≤1.128 min/year
Duration R8840: ≤1.251 min/year
R8860/R8860E: ≤1.383 min/year
R8880: ≤1.632 min/year
R8890: ≤1.877 min/year



6 Operation and Maintenance
The operation and management of BS8700 is performed by the ZTE unified network
management system, NetNumen M31, which adopts client/server architecture. The
server runs Solaris OS + Oracle database. The client adopts Windows system, enabling
human-machine management for the network element.

Network
NMS/OSS Management
Layer
Itf-N Interface

NOP Alar Conf. Perf Versi Topolog Securit
m orma on y y
nce Element
Management
Layer
Toolset NetNumen M31

Adaptation Layer

BIN / MML/ File
interface

GSM UMTS LTE Network
BSS UTRAN E-UTRAN Element

Figure 25 NetNumen M31 Elements Management System

The BSS/UTRAN/E-UTRAN provides a transparent channel to implement operation and
maintenance information interaction between NetNumen M31 and the radio network.
Management of the BSC/RNC and the BTS/Node B/eNode B adopts unified client
interface for security management and operation log. NetNumen M31 also supports
CORBA/SNMP Itf-N interface towards third-part NMS.

BS8700 operation and maintenance system supports the following functions:

• Version Management

With this function, administrator can view versions of the all software and hardware
running at the foreground. The hardware version includes the BOOT version number
and its generation time. The software version includes the software version number,
download time and its current running state.



The background provides a software downloading system for software
download/upgrade at the foreground. Before download/upgrade, warehousing
processing is required. The warehousing process will copy the version files to the server
and register to the server.

Software versions existing in the base stations can be activated with or without software
tests.

• Alarm Management

The alarm management system monitors running states of the base stations,
dynamically displays the rack structure of the foreground module and collects abnormal
information of the boards, links, database and server in real time. These functions make
it convenient to analyze, address the problems, maintenance and repair.

Information collected by the alarm management system includes notification, alarm and
alarm recovery.

The alarm management system synchronizes alarms, reports historical alarms and
current alarms, and sets and queries alarm shielding.

• Configuration Management

Configuration management implements functions of equipment configuration and radio
configuration.

• Log Management

NetNumen M31 system provides the log management function. Any operation performed
by operator will be recorded automatically. Thus, the operation maintenance
administrator can query historical operation records. Log records are saved in the NM
database server.

In the BS8700, it has memory on CC board in order to preserve database, the storage
time is 90 days.

• Security Management

Security management is implemented through user management and user group
management. The user management includes the management for user name,
password and user groups which the user belongs to. The user group management
includes the management of user group name and authority information (indicating
authorities the user group has).

• Performance Management

Performance management is to measure, report and provide performances statistic of
base stations.

• Diagnosis and Test



Diagnosis and test are important components of EMS. The network administrator can
check whether system hardware is working properly by diagnosis and test. They are also
able to trace and fix the faults on time to secure the safe operation of the system.

Base station diagnosis and test cover the following functions:

− Information reporting

− Board link testing

− Receiving field strength testing

− Environment information monitoring

• Other Supplementary Functions

The operation and maintenance system also provides other supplementary functions to
facilitate base station maintenance, which include but not limited signaling tracing,
channel viewing, abnormal record reporting and viewing.

In ZXSDR BS8700, the time of impact on service because of the hardware’s broken-
down is under control. ZXSDR BS8700 has auto restart mechanism which supports
Radio Unit auto restart, main control board auto restart, Baseband processing unit auto
restart, the whole base station auto restart.

The Radio Unit auto restart time is one minute. The main control board which is CC
board auto restart time is 3 minutes. The Baseband processing unit that includes UBPG
and BPC board auto restart time is one minute. The whole base station auto restart time
is 4 minutes.



7 Configuration Principles

7.1 Baseband Unit Configuration Principles
Different baseband processing boards can be configured in BS8700 baseband unit for
different scenario. UBPG board supports GSM/GPRS/EDGE/E-EDGE. BPC board
supports UMTS/HSPA/HSPA+. The processing capability of baseband processing
boards is listed as below:

• Single UBPG board supports GSM/GPRS/EDGE/E-EDGE 12TRX;

• Single BPC supports 6CS, uplink 192/384CE and downlink 192/384CE;

In typical configuration, the BS8700 baseband unit provides 4 baseband processing
board slots. 1 more BP board can be available if only one optical switch board is
configured.

FS: Fabric Switch board, there are 6 pairs CPRI interface in each FS board, 2 FS boards
can be configured in B8200 maximally.

SA: Site Alarm board, support 8 dry contacts and 8 pairs of E1/T1, 1 SA board for each
B8200 is mandatory configuration.

SE: Site Alarm Extension board, support 8 dry contacts and 8 pairs of E1/T1, 1 SE board
can be configured if the requirements of dry contacts or E1/T1 exceed the SA capacity.

NIS: Network Interface of STM-1 board, configured when Abis/Iub adopts STM-1
interface.

PM: Power Module, 1 PM board for default configuration, if needed, 1+1 is available
option.

FAM: Fan array Module, 1 FAM board for each B8200 is mandatory configuration.

CC: Control and Clock board, 1 CC board for default configuration, if needed, 1+1
backup or load sharing is an available option. One Control and Clock board supports 01
FE/GE electrical interfaces and 01 FE/GE optical interfaces toward BSC (Abis) and
RNC(Iub).

7.2 Radio Unit Configuration Principles
On different frequencies and software configurations, BS8700 can be configured as
various GSM/UMTS base stations:

• In GSM single mode, R8860/R8860E can support 1 to 6 TRX.

• In UMTS single mode, R8840 and R8860/R8860E can support 1 to 4 carriers, R8880 can
support 1 to 4 carriers in both 2 sectors, R8890 can support 1 to 3 carriers in 3 sectors;



• If GSM/UMTS are in the dual mode, single R8860/R8860E can support 1 UMTS Carriers + 4
GSM TRX or 2 UMTS Carriers + 2 GSM TRX at maximum;

7.3 GSM Single Mode Configuration Principles
R8860/R8860E is needed to be configured for GSM single mode, which is based on
multi-carrier technology. In GSM mode, R8860/R8860E supports 1 to 6 TRX in 1 sector.
For baseband part, one UBPG board supports 12 TRX.

7.3.1 R8860/R8860E configuration

Table 15 ZXSDR BS8700 Configuration for GSM Single Mode (Multi-carrier)

Site Type R8860/R8860E B8200 Qty UBPG Qty
Qty
S4/4/4 3 1 1
S8/8/8 6 1 2
S12/12/1
9 1 3
2

7.4 UMTS Single Mode Configuration Principles
R8840, R8860/R8860E, R8880 or R8890 is needed to be configured for UMTS single
mode.

R8840’s maximum output power is 60W, supporting 3 carriers when it ensures the 20W
output power for each carrier.

R8860/R8860E’s maximum output power is 80W, supporting 4 carriers when it ensures
the 20W output power for each carrier.

R8880’s maximum output power is 2*60W, supporting 3 carriers when it ensures the
20W output power for each carrier.

R8890 maximum output power is 3*60W working on 2100MHz, supporting 3 carriers 3
sectors when it ensures the 20W output power for each carrier.

For baseband part, one BPC board supports 6CS.

7.4.1 R8840/R8880 configuration

Table 16 ZXSDR BS8700 Configuration UMTS Single Mode (R8840/R8880)

Site Type R8840/R8880 Qty B8200 Qty BPC Qty
S1/1/1 3 1 1
S2/2/2 3 1 1



S3/3/3 3 1 2
S2/2/2/2/2/2 6 1 2

7.4.2 R8860/R8860E configuration

Table 17 ZXSDR BS8700 Configuration UMTS Single Mode (R8860/R8860E)

Site Type R8860/R8860E Qty B8200 Qty BPC Qty
S1/1/1 3 1 1
S2/2/2 3 1 1
S4/4/4 3 1 2
S2/2/2/2/2/2 6 1 2

7.4.3 R8890 configuration

Table 18 ZXSDR BS8700 Configuration UMTS Single Mode

Site Type R8890 Qty B8200 Qty BPC Qty
S1/1/1 1 1 1
S2/2/2 1 1 1
S3/3/3 1 1 2
S2/2/2/2/2/2 2 1 2

7.5 GSM/UMTS Dual Mode Configuration Principles

7.5.1 GSM 850M/900M/1800M/1900M and UMTS 850M/900M/1800M/1900M
Dual-Mode Network in Same Spectrum

R8860/R8860E can be configured in 850/900/1800/1900M G/U dual-mode. One
R8860/R8860E supports 4 GSM TRX + 1 UMTS carrier or 2 GSM TRX + 2 UMTS
carriers simultaneously.

Table 19 BS8700 Configuration for G/U Dual-Mode (Same Spectrum)

Site Type R8860/R8860 B8200 Qty UBPG Qty BPC Qty
E Qty
G:S444+U:S111 3 1 1 1
G: S222+U:S222 3 1 1 1
G: S666+U:S333 6 1 2 2



7.5.2 GSM 850M/900M/1800M/1900M and UMTS 2100M Dual-Mode Network
in Different Spectrums
R8840 or R8880 and R8860/R8860E are configured simultaneously in this scenario,
R8840 or R8880 is used for UMTS 2100M while R8860/R8860E is used for GSM
850/900/1800/1900M.

Wideband combiner is required in the mode of co-feeder-line and co-antenna.

Table 20 BS8700 Configuration for G/U Dual-Mode (Different Spectrums)

Site Type R8840/R888 R8860/R8860 B8200 UBPG BPC
0 Qty E Qty Qty Qty Qty
U:S222(2100M) +
G:S6/6/6(850/900/1800/1900M 3 3 1 2 1
)



8 Acronyms and Abbreviation
Abbreviations Full Characteristics
3GPP 3rd Generation Partnership Project

64QAM 64 grade Quadrature Amplitude Modulation

AGPS Assisted GPS

AMR Adaptive Multi Rate

BB Base Band

BBS Base Band Sub-system

BBU Base Band processing Unit

BCCH Broadcast Control Channel

BITS Building Integrated Timing Supply

BP Base band Processing

BPC Base band Processing Board Type C for UMTS

BRACS Bearer Access Control Sub-system

BRS Bearer Sub-system

BSC Base Station Controller

BSP Board Support Package

BTS Base Transceiver Station

CAPEX Capital Expenditure

CC Control & Clock

CE Channel Element

CN Core Network

CORBA Common Object Request Broker Architecture

CPRI Common Public Radio Interface

CS Carrier Sector

DBS Data Base Sub-system

DL Down Link

DTX Discontinuous transmission

EDGE Enhanced Data rates for GSM Evolution

E-EDGE Enhanced EDGE

EFR Enhanced Full Rate



FAM Fan Module

FE Fast Ethernet

FP Frame Protocol

FR Full Rate

FS Fabric Switch

GE Gigabit Ethernet

GERAN GSM Edge Radio Access Network

GPS Global Positioning System

GSM Global System for Mobile communications

HR Half Rate

HSPA+ HSPA Evolution

LMT Local Maintenance Terminal

LTE Long Term Evolution

MicroTCA Micro Telecommunications Computing Architecture

MIMO Multi Input Multi Output

MS/UE Mobile Station/User Equipment

MTBF Mean Time Between Failures

MTTR Mean Time To Recovery

NBAP Node B Application Part

NIS Network Interface of STM-1

NM NetNumen, Name of ZTE OMCR

NMS Network Management System

NOP Network Optimization & Planning

OAM Operating And Maintenance

OPEX Operation Expenditure

OSS Operation Support Sub-system

PM Power Module

PS Packet Switch

PtM Point to Multi-point

PtP Point to Point

RCS Radio Control Sub-system

RF Radio Frequency



RNC Radio Network Controller

RRU Remote Radio Unit

RTT Round Trip Time

SA Site Alarm

SCS System Control Sub-system

SDH Synchronous Digital Hierarchy

SDR Software Defined Radio

SE Site Alarm Extension

SNMP Simple Network Management Protocol

TA Time Advance

TNS Transport Network Sub-system

UBPG Universal Base band Processing for GSM

UL Up Link

UTRAN UMTS Terrestrial Radio Access Network

WCDMA Wideband Code Division Multiple Access


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