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Particular Radio Function WCDMA RAN
Feature Guide
Particular Radio Function Feature Guide
ZTE Confidential Proprietary © 2011 ZTE Corporation. All rights reserved. I
Particular Radio Function Feature Guide
Version Date Author Approved By Remarks
V4..5 2010-06-18 Zhang Yiqian
JiangMing
Added three function
descriptions: Dynamic Power Track, OCNS and Smoothly Cell out off Service
V5.0 2011-2-9
Chen Changgen,
Zhang Yiqian
JiangMing,Liuqi
Added descriptions of VSWR
Alarm Recovery, Int ra-sector RTWP Unbalanced Alarm, Node B Energy Saving Mode.
© 2011 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.
Particular Radio Function Feature Guide
II © 2011 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary
TABLE OF CONTENTS
1 Functional Attribute ............................................................................................ 1
2 Overview .............................................................................................................. 1
2.1 Active Tx Gain Calibration .................................................................................... 1 2.2 Received Power Scanner ..................................................................................... 1 2.3 Electrical Tilt Antenna ........................................................................................... 2 2.4 Multi-band Support................................................................................................ 2 2.5 Dynamic Power Track........................................................................................... 2 2.6 OCNS .................................................................................................................... 3 2.7 Smoothly Cell out off Service................................................................................ 3 2.8 Node B Energy Saving Mode ............................................................................... 3 2.9 VSWR Alarm Recovery......................................................................................... 3 2.10 Intra-sector RTWP Unbalanced Alarm ................................................................. 3
3 Active Tx Gain Calibration ................................................................................. 4
3.1 Objective Function ................................................................................................ 4 3.2 Principles of Implementation................................................................................. 4
4 Received Power Scanner ................................................................................... 5
4.1 Principles of Implementation................................................................................. 5 4.2 Function Application.............................................................................................. 5
5 Electrical Tilt Antenna ........................................................................................ 6
5.1 Functions of Electrical Tilt Antenna ...................................................................... 6 5.2 Constitution of Electrical Tilt Antenna System ..................................................... 6 5.2.1 Control Motor ........................................................................................................ 6 5.2.2 Electrical Adjustement Bias Tee ........................................................................... 7 5.2.3 Other Accessories................................................................................................. 8 5.3 AISG Interface....................................................................................................... 9 5.4 Typical Application of Electrical Tilt Antennas...................................................... 9 5.4.1 Application Scheme of Single System Electrical Tilt Antennas in Macro
Base Station ......................................................................................................... 9 5.4.2 Application Scheme of Single System Electrical Tilt Antennas in RRU ............ 10 5.4.3 Local and Remote Control Application Schemes for Electrical Tilt Antenna
System ................................................................................................................ 14
6 Multi-band Support ........................................................................................... 14 6.1 Principles of Implementation............................................................................... 14 6.2 Supported Bands ................................................................................................ 15
7 Dynamic Power Tracking ................................................................................. 15
7.1 Objective ............................................................................................................. 15 7.2 Working Principle ................................................................................................ 16
8 Orthogonal Channel Noise Simulator Test .................................................... 17
8.1 Function Objective .............................................................................................. 17 8.1.1 Test Mode 1 ........................................................................................................ 18 8.1.2 Test Mode 2 ........................................................................................................ 18
Particular Radio Function Feature Guide
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8.1.3 Test Mode 3 ........................................................................................................ 18 8.1.4 Test mode 4 ........................................................................................................ 19 8.1.5 Test Mode 5 ........................................................................................................ 19 8.1.6 Test Mode 6 ........................................................................................................ 19 8.2 Implementation Principle .................................................................................... 19
9 Smoothly Cell out off Service.......................................................................... 20
9.1 Objective ............................................................................................................. 20 9.2 Working Principle ................................................................................................ 20 9.2.1 Process for enabling „Smoothly Cell out off Service‟ ......................................... 20 9.2.2 Process for disabling „Smoothly Cell out off Service‟ ......................................... 21
10 Node B Energy Saving Mode........................................................................... 22
10.1 Objective ............................................................................................................. 22 10.2 Working Principle ................................................................................................ 22
11 VSWR Alarm Recovery..................................................................................... 23
11.1 Implementation principle ..................................................................................... 23 11.2 Application........................................................................................................... 23
12 Intra-sector RTWP Unbalanced Alarm ........................................................... 23 12.1 Implementation Principle .................................................................................... 23
13 Parameters and Configuration ........................................................................ 24
13.1 Parameter List ..................................................................................................... 24 13.2 RET Parameter Configuration ............................................................................ 24 13.2.1 Parent DN ........................................................................................................... 26 13.2.2 Device serial number .......................................................................................... 26 13.2.3 Device Type ........................................................................................................ 26 13.2.4 Vendor code ........................................................................................................ 26 13.2.5 AISG Version No................................................................................................. 26 13.2.6 Subunits No......................................................................................................... 26 13.2.7 Description of self-defined field .......................................................................... 26 13.2.8 Superior channel ................................................................................................. 26 13.2.9 Local channel ...................................................................................................... 26 13.2.10 Connected TMA device ...................................................................................... 27 13.2.11 Connected RET device ....................................................................................... 27 13.2.12 AISG main control unit ........................................................................................ 27 13.2.13 Tilt........................................................................................................................ 27 13.3 Smoothly Cell out off Service Parameter Configuration..................................... 30 13.4 Node B Energy Saving Mode Parameter Configuration .................................... 32 13.5 Intra-sector RTWP Unbalanced Alarm Parameter Configuration ...................... 34
14 Counter And Alarm ........................................................................................... 35
14.1 Counter List ......................................................................................................... 35 14.2 Alarm List ............................................................................................................ 35 14.2.1 Abnormal Power Alarm ....................................................................................... 35 14.2.2 RET Alarm........................................................................................................... 36 14.2.3 VSWR alarm ....................................................................................................... 36
Particular Radio Function Feature Guide
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15 Glossary ............................................................................................................. 37
Particular Radio Function Feature Guide
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FIGURES
Figure 5-1 Appearance of Kathrein motor ............................................................................... 7
Figure 5-2 Appearance of Kathrein electrical adjustment bias tee ......................................... 7
Figure 5-3 Appearance of divider ............................................................................................ 8
Figure 5-4 Appearance of AISG control line............................................................................ 8
Figure 5-5 Appearance of AISG control line card ................................................................... 8
Figure 5-6 Remote scenario scheme for electrical tilt antenna in macro base station......... 10
Figure 5-7 RRU + electrical tilt antenna + RCU + ALPD scenario in a single sector ........... 11
Figure 5-8 RRU + electrical tilt antenna + RCU scenario in a single sector ......................... 11
Figure 5-9 RRU + electrical tilt antenna + RCU + ALPD scenario in three sectors.............. 12
Figure 5-10 RRU + electrical tilt antenna + RCU+NSBT+ASBT scenario in a single sector 13
Figure 5-11 RRU + electrical tilt antenna +RCU+NSBT+ASBT scenario in three sectors... 13
Figure 5-12 Local and remote monitoring diagram of electrical tilt antenna......................... 14
Figure 7-1 Load Variation of a WCDMA NodeB Cell in One Day ......................................... 16
Figure 7-2 D-PT Working Principle Diagram ......................................................................... 17
Particular Radio Function Feature Guide
ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved. 1
1 Functional Attribute
System version: [RNC V3.09, Node B V4.09, OMMR V3.09, and OMMB V4.09]
Attribute: [Optional]
Involved NEs:
UE Node B RNC MSCS MGW SGSN GGSN HLR
√ √ - - - - - -
Note:
*-: Non-related NE
* √: Related NE
Dependency: None
Exclusion: None
Remarks: electrical tilt antenna subitem, hardware requires electrical tilt antenna.
2 Overview
2.1 Active Tx Gain Calibration
This function supports downlink active Tx gain calibration, i.e., the system calculates the
Tx baseband digital power and the Tx analog output power at the same. If the analog
power deviates from the digital power to a certain threshold, the system will adjust the
downlink Tx gain to keep the Tx analog power consistent with the Tx digital power. This
avoids not only damage to the amplifier due to over high power but also capacity
reduction due to over low power, ensuring accuracy of downlink output power of the
base station. It offers customers the following advantages:
Enhance the security and precision of the RF Tx power
Reduce the margin demand calculated for the maximum output power in network
planning to obtain higher output power.
2.2 Received Power Scanner
This function is used to scan the signal power received by the antenna within the
receiver frequency bandwidth and judge whether there is interfering signal on receiver
frequency bandwidth. When this function is enabled, antennas scan at the same time:
starting from initial frequency, calculate the power within the carrier bandwidth of center
Particular Radio Function Feature Description
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frequencies at specific scanning stepped interval (1 MHz), calculate and report the list of
signal power within the scanned frequency band.
2.3 Electrical Tilt Antenna
This function is used to adjust the downtilt angle through remote or local control software.
It is achieved through changing the phase of multi-element antenna array and adjusting
field amplitudes of the vertical and horizontal vectors. The electrical tilt antenna control
unit is integrated into the Node B internal rack. The operator can adjust and detect the
downtilt angle of an antenna through the RET software in the remote O & M center. The
electrical tilt antenna is widely used in radio coverage system. Compared to the
traditional antenna system, it has many advantages.
Adjust the downtilt angle of the electrical tilt antenna without the need of switching
off the power. Detect the downtilt angle in real time.
High-precision tilt avoids frequency interference and Tx interference.
The operation can adjust the downtilt angle of the antenna remotely.
Weather change, time and Node B location have no affect on the tilt operation of
the downtilt angle of the antenna.
2.4 Multi-band Support
This function is used to help the operator to get base station of other frequency bands
besides UMTS2100 basic frequency band.
Besides UMTS2100, ZTM also supports UMTS850, UMTS900, UMTS AWS, UMTS1800,
and UMTS1900. In addition, it can support customized frequency bands to satisfy
customer requirements.
Node B supports other frequency band through replacing with the RF unit of the
corresponding frequency band.
2.5 Dynamic Power Track
This function is designed to enhance the power amplifier (PA) efficiency under different
loads, so as to help operators reduce NodeB operation expenditure and improve their
product reliability.
Dynamic Power Tracking (D-PT) is a unique technology developed by ZTE to adjust the
bias voltage of the PA power supply. In combination with the advanced Doherty
technology, the D-PT can not only enable the PA efficiency to reach 40% when the
output power is the maximum, but also improve the PA efficiency under other different
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loads, so as to reduce the power consumption of the overall system of the NodeB. The
solution perfectly satisfies operator‟s demands for energy saving.
2.6 OCNS
The orthogonal channel noise simulator (OCNS) can simulate many virtual users in the
downlink network load test through the built-in OCNS function, enabling that the
operation can validate the RF performance and radio network performance without a lot
of terminals.
2.7 Smoothly Cell out off Service
The feature supports reducing the power of Common Pilot Channel step by step before
closing the cell when whole or part of Node B is needed to be power off. Due to gradual
weakness of the pilot signals, it can smoothly switch the UE to the cell of other Node B
or GSM network based on the hand-over strategy, and the users that are attempt to
access the carrier are rejected. The cell will be closed after the power of CPICH is reach
the threshold value (-10dbm). In this way, it can avoid call drop caused by the sudden
disappearance of the cell, which influences user experience. The use of this function can
be set by OMC-B.
2.8 Node B Energy Saving Mode
The feature guarantees the battery backup of transmission and basic service, lower the
load of battery to prolong its recycling life which decreases the OPEX
2.9 VSWR Alarm Recovery
This function supports VSWR alarm auto-recovery. The system measures the value of
VSWR. If it exceeds default threshold (3.0) for consecutive 3 times, the system will
disable its power amplifier. If there is neither over -power alarm nor over-high
temperature alarm, the system will wait for 30 minute and automatically enable the
power amplifier. Then it will observe the value of VSWR again. If the value of VSWR is
smaller than pre-defined threshold, the VSWR alarm is automatically recovered.
2.10 Intra-sector RTWP Unbalanced Alarm
This function can be used to detect unbalanced values of RTWP received by two
antennas within the same sector and report a RTWP unbalanced alarm. Each sector
has two antennas. The system can detect and measure the values of RTWP received by
the two antennas. Then the system calculates the difference between the two RTWP
Particular Radio Function Feature Description
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values. If the absolute value of the difference is larger than pre-defined threshold, a
RTWP unbalanced alarm is reported.
3 Active Tx Gain Calibration
3.1 Objective Function
According to the 3GPP TS 25.104 protocol, the maximum output power of the Node B
must be within the range of device rated output power provided by the manufacturer ±
2.0 dB normally. In an extreme situation, it must be within the range device rated output
power provided by the manufacturer ± 2.5 dB.
To enhance the security and precision of the RF Tx power, and to reduce the margin
demand calculated for the maximum output power in network planning for higher output
power, ZTE has developed active Tx gain calibration. Normally, the output power of the
Node B can be with the range of baseband digital output power ± 0.5 dB normally; in an
extreme situation, it can be within the range of baseband digital output power ± 1 dB.
3.2 Principles of Implementation
Active Tx gain calibration is achieved by automatic closed loop adjustment of Node B
downlink gain, including Tx baseband digital power and Tx analog output power
synchronic measurement, active gain adjustment, abnormal power alarm. For details,
see the following:
Tx baseband digital power measurement
It is achieved by the FPGA: multiplex the downlink signal sent by the baseband as I/Q
data of carriers by the FPGA in transceiver board; calculate the power values of carriers
in the FPGA, and get the average Digital Tx Carrier Power (TCPWD) within a minute.
Tx analog output power measurement
Synthesize the signal from the pre-distortion feedback path of the transceiver board in
the ADC, then calculate the power of carriers in the FPGA, and get the average Analog
Tx CarrierPower (TCPWA) within a minute.
Active gain adjustment
Active gain adjustment controller compares the average Digital Tx Carrier Power
(TCPWD) to the average Analog Tx CarrierPower (TCPWA). If the analog power
deviates from the digital power (∆ =TCPWD - TCPWA) more than 0.3 dB, adjust the
digital gain adjustment factor to gradually adjust the total gain of the Tx path (once every
one minute) in a manner that the analog Tx power is gradually close to the digital Tx
power and Node B output power offset is compensated. The minimum step for
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adjustment is 0.1dB. When the analog power deviates from the digital power (∆ =
TCPWD - TCPWA) less than 0.3 dB, the adjustment is complete.
Abnormal Power alarm
When the accumulated difference between the baseband digital power and the analog
output power is greater than 6 dB (|∆|>6dB), active gain adjustment stops and Node B
reports an abnormal power alarm.
When the Node B is running, the system will automatically start active Tx gain calibration
function to actively compensate the gain fluctuation that varies with the environment,
temperate change or component aging due to long-time. This ensures the precision of
Node B downlink output power without any manual operations.
4 Received Power Scanner
4.1 Principles of Implementation
According to OMCB setting information, the transceiver board sets receiver center
frequencies one by one and calculates the Received Total Wideband Power (RTWP)
within the carrier bandwidth of center frequencies, also called Received Signal Strength
Indicator (RSSI). Take the UMTS2100M band as an example. Configure a receiver
center frequency every 1 MHz between 1920 MHz to 1980 MHz. Report the measured
RTWP, and then scan the next center frequency and measure the RTWP. Finally, scan
and list the signal power received by the antenna with the uplink frequency band 1920
MHz – 1980MHz, and judge whether there is interfering signal on receiver frequency
bandwidth. When this function is enabled, antennas scan at the same: starting from
initial frequency, scan the power of within the carrier bandwidth center frequencies at
specific scanning stepped interval (1 MHz), calculate and report the RTWP.
4.2 Function Application
This function is originated manually: Start the received power scan order in the OMC -B
background. Then, the system prompts to interrupt current services and delete the cell.
After the scanning is complete, the frequency automatically res tores to the previous cell
frequency before scanning.
Interface path: view -> performance Management -> Measurement Task Management
Particular Radio Function Feature Description
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5 Electrical Tilt Antenna
5.1 Functions of Electrical Tilt Antenna
Electrical tilt antennas are generally classified into two types: fixed and adjustable.
Adjustable electrical tilt antennas are also classified into two types by adjustment mode:
local and remote.
Remote electrical tilt antenna allows the system to adjust the downtilt angle in directional
pattern without powering off. Therefore, the antenna can be detected and adjusted in
real time, regardless of weather, geographic environment, etc. Its stepping precision in
angle adjustment is high (0.1°). Thus the remote electrical tilt antenna can be used to
adjust the network precisely, shorten the network construction period and reduce the
maintenance cost.
Electrical tilt antennas have the main functions:
Have standard AISG interfaces
Realize automatic angle adjustment of local antennas
Control automatic angle adjustment of remote antennas remotely
One RRU can control a maximum of three electrical tilt antennas to control the
motor
Perform configuration and network management through LMT or OMC.
5.2 Constitution of Electrical Tilt Antenna System
Electrical tilt antenna system is generally composed of electrical tilt antenna, a control
motor, lightning protection board, AISG cable, and other an electrical adjustment control
parts. The electrical tilt antenna and main accessories (control motor, lightning
protection board, route transfer board, etc.) are generally installed on the outdoor iron
standing at the top of the tower. They are mounted on a pole. Their external sealing and
waterproofing measures meet IP95 standard.
5.2.1 Control Motor
Generally, the control motor is also called Antenna Control Unit (ACU, a RFS control
motor) or Remote Control Unit (RCU, a Kathrein motor).
As a part of the antenna downtilt angle remote control system, the control motor
supports precise adjustment of antenna downtilt angle at the bottom of the tower or
through the network management system, as shown in Figure 5-1.
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Figure 5-1 Appearance of Kathrein motor
5.2.2 Electrical Adjustement Bias Tee
Electrical adjustment Bias Tees are classified into Antenna Smart Bias Tees (ASBTs)
and Node B Smart Bias Tees (NSBT), shown in Figure 5-2.
Figure 5-2 Appearance of Kathrein electrical adjustment bias tee
Its functions and typical characteristics are as follows:
Provide DC through RF cables and transmit AISG communication signal
Include AISG MODEM
Feature 824 MHz -2170 MHz wide frequency band application, small compact
outdoor unit
Have 10kA, 8 us/20 us lightning protection function
Support several connector types
Particular Radio Function Feature Description
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5.2.3 Other Accessories
Other accessories include AISG divider, AISG control line, and AISG control line card.
Figure 5-3 Appearance of divider
Figure 5-4 Appearance of AISG control line
Figure 5-5 Appearance of AISG control line card
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5.3 AISG Interface
Antenna Interface Standards Group (AISG) interface is a set of standard protocol
proposed by Antenna Interface Standard Association for remote control and monitoring
of antenna series products.
AISG has two protocol versions: ASIG1.1 and ASIG2.0. ASIG2.0 is written into 3GPP
R7, i.e., Iuant interface (electrical tilt antenna and tower amplifier standard control
interface)
ZTE WCDMA devices support remote electrical management of antennas from Andrew,
Kathrein, Argus, Powerwave, RFS, Mobi and Comba. These antennas have standard
AISG interfaces. ZTE WDCMA systems already supported ASIG1.1 in the V4.00.100 .
5.4 Typical Application of Electrical Tilt Antennas
5.4.1 Application Scheme of Single System Electrical Tilt Antennas in
Macro Base Station
This scheme is mainly used to remote scenarios where the macro base station location
is more than 30 meters away from the electrical tilt antenna. For the solution, refer to
Figure 5-6.
Particular Radio Function Feature Description
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Figure 5-6 Remote scenario scheme for electrical tilt antenna in macro base station
7/8 Feeder Cables
½ Jumpers
½ Jumpers
Sector1 Sector2 Sector3
Node BUMTS
Tx/Rx Tx/RxD Tx/Rx Tx/RxD Tx/Rx Tx/RxD
NSBT
ASBT
ACU
RET
Tx/RxDTx/Rx
-45°+45°
RET
Tx/RxDTx/Rx
-45°+45°
RET
Tx/RxDTx/Rx
-45°+45°
AISG cable
Special AISG cable
5.4.2 Application Scheme of Single System Electrical Tilt Antennas in RRU
The RRU is usually installed outdoor. The following takes ZTE RRU as an example to
describe application scenario and solution for single system electrical tilt antenna.
5.4.2.1 Local scenario scheme for RRU + Electrical Tilt Antenna
In this scenario, the RRU installation location is generally less than 10 meters away from
the electrical tilt antenna. If the RRU and electrical tilt antenna are installed on the top of
a building, typical configuration is an antenna feeder system, including electrical tilt
antenna, RCU, Antenna Lightning Protect Unit (ALPD), and feeder cable. The single
sector configurations are shown in Figure 5-7 and Figure 5-8. Figure 5-8shows the
configuration in a scenario where the antenna is installed on the top of a building outside
without ALPD, and the antenna is connected to the RRU with an AISG cable. Three-
sector configuration is similar, as shown in Figure 5-9.
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Figure 5-7 RRU + electrical tilt antenna + RCU + ALPD scenario in a single sector
RRU
RCU
AISG cable
ALPD
Cable Optical fiber
BBU
Figure 5-8 RRU + electrical tilt antenna + RCU scenario in a single sector
RRU
RCU
AISG cable
Cable Optical fiber
BBU
Particular Radio Function Feature Description
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Figure 5-9 RRU + electrical tilt antenna + RCU + ALPD scenario in three sectors
RRU
RCU
Cable Optical fiber
AISG cable
ALPD RRU
RCU
RRU
RCU
BBU
5.4.2.2 Remote scenario scheme for RRU + Electrical Tilt Antenna
In this scenario, the RRU is generally installed under the tower or indoor; the electrical
tilt antenna is installed on the tower; the distance between the electrical tilt antenna and
the RRU is greater than 10 meters. Typical configuration is an antenn a feeder system,
including electrical tilt antenna, RCU, NSBT, ASBT and feeder cable, as shown in Figure
5-10 and Figure 5-110. To regulate the configuration, the NSBT and ASBT are uniformly
installed on the main antenna.
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Figure 5-10 RRU + electrical tilt antenna + RCU+NSBT+ASBT scenario in a single sector
Figure 5-11 RRU + electrical tilt antenna +RCU+NSBT+ASBT scenario in three sectors
BBU
RRU
Cable Optical fiber AISG cable
RCU
NSBT
ASBT
RRU
Cabl
e Optical fiber AISG cable
NSBT
ASBT
Particular Radio Function Feature Description
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5.4.3 Local and Remote Control Application Schemes for Electrical Tilt Antenna System
Electrical tilt antennas are classified into Mechanical & Man fixed Electrical Tilt (MET)
antennas and Remote Electrical Tilt (RET) antennas. Local and remote monitoring
diagram is shown in Figure 5-12.
Figure 5-12 Local and remote monitoring diagram of electrical tilt antenna
The local computer realizes local communication and control through the LMT. The
OMC realizes remote control through the RNC and Node B.
6 Multi-band Support
6.1 Principles of Implementation
Using module design, ZTE multiple frequency bands base stations solution can improve
multiplexing degree, shorten research and development cycle, reduce research and
development cost, and bring forth more benefit to our customers. Its principles of
implementation are described as follows:
1 The system architecture is designed based on the multi-band requirement, where
the RF module is replaced according to the corresponding bands.
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2 For different bands, the RF module is configured by changing Transceiver Unit,
DuplexerUnit, and PA Unit corresponding to these bands. These units are also
designed on the same plat form, in the same architecture on based the multi -band
requirement.
3 Based on the existing software platform, related software can realize base station
function at multiple frequency band by changing its frequency configuration.
6.2 Supported Bands
3GPP defines 10 frequency bands in the UMTS system. For details, see the following
table:
Operating Band
UL Frequencies DL frequencies
UE transmit, Node B receive UE receive, Node B transmit
I 1920 - 1980 MHz 2110 -2170 MHz
II 1850 -1910 MHz 1930 -1990 MHz
III 1710-1785 MHz 1805-1880 MHz
IV 1710-1755 MHz 2110-2155 MHz
V 824 - 849MHz 869-894MHz
VI 830-840 MHz 875-885 MHz
VII 2500 - 2570 MHz 2620 - 2690 MHz
VIII 880 - 915 MHz 925 - 960 MHz
IX 1749.9 - 1784.9 MHz 1844.9 - 1879.9 MHz
X 1710-1770 MHz 2110-2170 MHz
The multi-band series of base station is an important part of ZTE series of base station.
Besides band I(2100MHz), band II(1900 MHz), III(1800 MHz), IV(AWS), V(850 MHz),
VIII(900 MHz) are supported also. In addition, customized band shall be supported to
satisfy customer requirements.
7 Dynamic Power Tracking
7.1 Objective
PA efficiency generally means the PA efficiency when the output power is the maximum.
In fact, the load of the NodeB changes largely with the time. During the busiest period in
the day, the PA output power approaches to the maximum, and then the PA efficiency
also approaches to the maximum. But late at night, the traffic is much lower, the service
load of the PA is lower accordingly, and then the PA efficiency is also lower. Therefore,
when the traffic is low, the PA wastes power energy due to low efficiency. Figure 7-1
shows the load variation of a WCDMA NodeB cell in an area in one day.
Particular Radio Function Feature Description
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Figure 7-1 Load Variation of a WCDMA NodeB Cell in One Day
0 5 10 15 20 258
9
10
11
12
13
14
15
16
time(hour)
pow
er(w
)
BS transmit power & time
When the output power is low, the reason why the power efficiency is low is that the
traditional DPD+Doherty PA fixes the power supply voltage, that is, to reach a high
output and a high linearity, the PA must use high power supply voltage. In this way, the
PA also uses high power supply voltage even when the output power of the PA is low.
Therefore, the PA efficiency is low surely.
This traditional technology is unable to help operators reduce NodeB power
consumption in an all round way.
According to the emulation, compared to the fixed power supply voltage, adjusting the
bias voltage of PA power supply can enhance the PA efficiency when the output power
is at other levels besides at the maximum level.
7.2 Working Principle
Figure 14 shows the working principle of D-PT, a unique technology developed by ZTE.
This technology can adjust the bias voltage of the PA power supply. In combination with
the advanced Doherty technology, the D-PT can not only enable the PA efficiency to
reach 40% when the output power is the maximum, but also improve the PA efficiency
under other different loads, so as to reduce the power consumption of the overall system
of the NodeB. The solution perfectly satisfies operator‟s demands for energy saving,
The D-PT working principle is as follows:
1 Get measurement result of the digital transmitting power every two microseconds.
2 Compare the current digital power with the previous digital power. If the current
digital power is greater than the previous digital power, improve the drain voltage to
the voltage of the power range grade according to the power range query table.
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When the current digital power is less than the previous digital power, count the
average digital power within one hour, and then reduce the drain voltage to the
voltage of the power range grade according to the power range query table.
3 Map the adjusted voltage to the state machine of the power module. The power
module then selects the output voltage based on the state machine.
4 After the voltage adjustment, the RF gain varies. The system performs automatically
large-step gain compensation according to the comparison between the digital
power and the analog output power. The system then makes fine tune on the
compensation by using the Active Tx Gain Cailibration function.
Figure 7-2 D-PT Working Principle Diagram
As the digital power changes in the operation of the NodeB, the system runs
automatically the D-PT function, thus reducing the power consumption of the overall
system of the NodeB, without any additional operation at the background.
8 Orthogonal Channel Noise Simulator Test
8.1 Function Objective
In the system performance test, due to the limit of terminal number and complexity of the
test environment, it is hard to construct a radio transmission environment with certain
interference level through a lot of terminals.
ZTE RAN devices support channels simulated by the OCNS function to use the
orthogonal channel codes. Each channel uses PN9 random codes that are not related
with each other. Each simulated channel has its own power, but the power ratio between
Particular Radio Function Feature Description
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the channels is the same. Based on this principle, the OCNS can simulate the PAR of
signal interference between channel codes and signals in the actual environment. You
can simulate different downlink interference (load) level by setting the totol power of all
simulated channels, so as to evaluate the actual performance of the system under
different downlink loads conveniently. ZTE RAN devices support the OCNS to simulate
R99 and HSDPA channels, and can enable the OCNS function for multiple cells
simultaneously.
According to the 3GPP TS 25.141 protocol, the OCNS test supports six test modes (test
mode 1 - 6). Each test mode supports its own test items.
8.1.1 Test Mode 1
Test mode 1 has the following test items:
Occupied bandwidth
Spectrum emission mask
Adjacent Channel Leakage power Ratio
Spurious emissions
Transmit intermodulation
Base station maximum output power
Total power dynamic range (at Pmax))
Frequency error (at Pmax))
Error Vector Magnitude (at Pmax))
8.1.2 Test Mode 2
Test mode 2 has the following test items:
Output power dynamics
CPICH power accuracy
8.1.3 Test Mode 3
Test mode 3 has the following test items:
peak code domain error
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8.1.4 Test mode 4
Test mode 4 has the following test items:
EVM measurement
Total power dynamic range
Frequency error
8.1.5 Test Mode 5
Test mode 5 has the following test item:
EVM for base stations supporting HS-PDSCH transmission using 16QAM modulation (at
Pmax)
8.1.6 Test Mode 6
Test mode 6 has the following test item:
Relative CDE for base stations supporting HS -PDSCH transmission using 64QAM
modulation
8.2 Implementation Principle
1 Users can edit the OCNS loading script with the following parameter configurations:
Base Station IP
Local cell ID
Test mode: one of the six test modes
Modulation method: modulation method in test mode 5 or 6 (0-QPSK, 1-QAM, 2-
64QAM)
Radio link power
Radio link channelized code
2 On a host that can be connected to the base station, use the OCNS test tools to run
the user-edited script to load the OCNS, and establish the code flow based on the
corresponding radio links generated and sent by the user script.
Particular Radio Function Feature Description
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9 Smoothly Cell out off Service
9.1 Objective
When Node B is going to upgrade its SW/HW version or in other operation
&maintenance conditions that whole or part of Node B is needed to be power off, the cell
involved should be closed in advance.
The sudden disappearance of the cell without any helpful measurements, it will likely
result in call drop in the cell, which influences user experience and receiving user
complaints.
This function can realize the intelligently cell out off service, for example, when Node B
is gonging to upgrade its SW version, although there are lots of on -line user in the cell,
the users of this cell will not be impacted, this funct ion can help smoothly switch the UE
to the cell of other Node B or GSM network based on the hand-over strategy, by
reducing the power of Common Pilot Channel step by step before closing the cell that
will be upgraded.
9.2 Working Principle
9.2.1 Process for enabling ‘Smoothly Cell out off Service’
The function of Smoothly Cell out off Service is achieved by start-up, users handover,
and cell out. For details, see the following:
1 Start-up
Select View-> SDR Dynamic Data Management, Open the SDR Dynamic Data
Management, select the NE to be handled on the left topology tree, and select “Local
Cell Object” item on the center tree, click “Query”, all of the Local cell Objects will be
listed in the table of the right panel. Select the local cell objects that you want to handle
in this table, and click the button of “Local Cell Smooth Block”, then set the parameter of
“Total Attenuation Time(s)” in the popup dialog.
After setting the parameter, click OK button, it will send a function enabling message to
the corresponding process of OAM.
In default, this function is closed.
2 users handover
After OAM receives the function enabling message, it will forward the message include
the two parameters to RCS (Radio control subsystem, with responsibility for Iub
signaling process and transmit) Main Control Process.
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i After receipt of the function enabling message, RCS Main Control Process
obtains the involved cell numbers from the database and broadcasts the
massage to these cells.
ii After RCS Cell Process receives the function enabling message with the two
parameters, sets the CPICH power attenuation timer based on the attenuation
interval time parameter, When the timing length is due, then constructs the cell
broadcast message with the CPICH power which be reduced from original
value based on the attenuation step parameter.
iii RNC knows that the pilot signal is gradually weakened via UE measurement,
and then it will switch the UE to the cell of other Node B or GSM network based
on the hand-over strategy.
iv After the function enabling message is send, if RCS Main Control Process
receives the cell set up or cell reconfiguration requirement message, it will
refuse the requirement and returns a cell set up or reconfiguration failed
message to the RNC, the users that are attempt to access the carrier a re
rejected, except that the function disabling message is send.
3 cell out
With gradual weakness of the pilot signal, the cell broadcast will be stopped, it means
that the cell will be closed after the power of CPICH is reach the threshold value (-
10dbm).
9.2.2 Process for disabling ‘Smoothly Cell out off Service’
If maintenance personnel wants to stop the function to keep the cell normally running
when the function is in the enable status, it can end the process of cell out via OMC-B
setting.
For details, see the following:
Select View-> SDR Dynamic Data Management, Open the SDR Dynamic Data
Management, select the NE to be handled on the left topology tree, and select
“Local Cell Object” item on the center t ree, click “Query”, all of the Local cell
Objects will be listed in the table of the right panel. Select the local cell objects that
you want to handle in this table, and click the button of “Local Cell Smooth unblock”,
then set the parameter of “Total Recovery Time(s)” in the popup dialog.
After click OK button, it will send a function disabling message to the corresponding
process of OAM.
1 After OAM receives the function disabling message, it will forward the message to
RCS Main Control Process
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3 After receipt of the function disabling message, RCS Main Control Process obtains
the involved cell numbers from the database and broadcasts the massage to these
cells.
4 After RCS Cell Process receives the function disabling message, kills the CPICH
power attenuation timer, then constructs the cell broadcast message with the
original CPICH power.
10 Node B Energy Saving Mode
10.1 Objective
The power device will switch to battery automatically in case of mains power breakdown,
Node B Energy Saving Mode can help prolong battery serving time. The function can
shut down some carriers or all carriers intelligently to maintain the operation of
transmission equipment and basic service as long as possible, so the basic service gets
better guaranteed, and lower the requirement of battery capacity.
10.2 Working Principle
The function is achieved by function open, triggered by alarm, and recovery. For details,
see the following:
1 Function open
In the OMC-B Configuration Management interface, you can configure the parameter
“Enable open accumulator-saving mode or not”, open the mode.
In default, this function is closed.
2 triggered by alarm
When mains power breakdown, the „main power down alarm‟ is reported by Node B, at
the same time the power device will switch to battery automatically
After OAM receives the alarm message, if the function is opened, it begins the timers
based on the set parameters,
1)When the first timing length is due, it will shut down other cells smoothly until there is
only one in each sector, as described in chapter 9,we have consider this action‟s
affection to existing user, they will hand over to the reserved cells smoothly.
2) When the second timing length is due, all cells will be shut down, then the
BP(baseband processing) boards and SE(site alarm extension) board in the BP slot,
PAs in RSUs or RRUs will be shut down, FS(fabric switch board)will be shut down at
Particular Radio Function Feature Guide
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last. The other boards in BBU and transceiver in RSUs/RRUs are reserved, so BBU can
remain the connections with RSUs/RRUs and RNC.
3 Recovery
When the „main power down alarm‟ is recovered, it will power on these boards and PAs
that had been shut down and recover all these cells that had been blocked.
11 VSWR Alarm Recovery
11.1 Implementation principle
Assumed that Pf orward stands for detected forward power, Pbackward stands for detected
backward power. The VSWR is calculated according to the following formula,
Pf orward -Pbackward = 20log10((VSWR+1)/( VSWR-1))
When the measured value of VSWR is larger than default threshold (3.0) for consecutive
3 times, an over-VSWR alarm is reported. Then the system will disable its power
amplifier. Half hour later, the system will enable the power amplifer again to measure the
value of VSWR. If the value of VSWR is smaller than pre-defined threshold, the VSWR
alarm is automatically recovered. Otherwise, the power amplifier is disabled, and so on.
11.2 Application
This function is initiated by the system. It doesn‟t need manual intervention.
12 Intra-sector RTWP Unbalanced Alarm
12.1 Implementation Principle
A local cell is set up under a RRU or RSU. First, obtain the values of average analog
power received by two antennas, denoted in RTWPm and RTWPd. Then calculate the
absolute value of the difference between the two average analog power values for every
15 minute., i.e. abs(RTWPm – RTWPd). After that, check whether the absolute value is
greater or equal to alarm threshold. If yes, a RTWP unbalanced alarm is reported. If the
absolute value is smaller than alarm recovery threshold, a RTWP alarm-recovery
message is reported. If the absolute value falls in the range o f alarm threshold and alarm
recovery threshold, alarm status will be kept unchanged.
In general, the alarm threshold and alarm recovery threshold are the same, 10dB in
default. The threshold must fall in the range of [1,14]dB.
Particular Radio Function Feature Description
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This alarm function is an option in some scenarios, so it has a switch. The alarm switch
is off in default. If there is a need to report this alarm, the switch is on. Application
It is used to detect whether an antenna is faulty.
13 Parameters and Configuration
13.1 Parameter List Abbreviated name Parameter name
Parent DN Parent DN
uniqueId Device serial number
devType Device Type
vendorCode Vendor code
aisgVersion AISG version
multiAntNo Subunits No.
userLabel Description of self-defined field
fatherPort Superior channel
selfPort Local channel
refTma Connected TMA device
refRet Connected RET device
refSdrDeviceGroup AISG main control unit
Tilt Tilt
13.2 RET Parameter Configuration
OMC Path
Interface Path: View->Configuration Management ->OMC->SubNetwork->Base station->
Base station Config Set->Equipment object->Auxiliary peripheral device->Antenna
system controller->AISG device object
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Double clicked a record in the right table, or click the “Create MO Object” button to
create a new AISG device object, you can configure all of these parameters.
Particular Radio Function Feature Description
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13.2.1 Parent DN
This parameter indicates the parent DN of this AISG device object. You can select one
as the parent DN of this object from the list.
13.2.2 Device serial number
This parameter is the unique ID of this AISG device object.
13.2.3 Device Type
This parameter indicates the specific type of electrical tilt antenna, such as RET, ATMA,
or COM.
13.2.4 Vendor code
This parameter indicates the vendor who produced this AISG device.
13.2.5 AISG Version No
This parameter indicates the AISG version.
13.2.6 Subunits No.
This parameter corresponds to an AISG device that can be controlled independently.
Attention that Subunits No. is invalid in the AISG1.1 and AISG2.0 Single RET devices.
13.2.7 Description of self-defined field
This parameter is the field that users create to descript this AISG device object, and it
can help to differentiate different AISG devices.
13.2.8 Superior channel
This parameter is used for the SDTMA devices of NSN private protocol. The superior
channel value is 0 in other devices.
13.2.9 Local channel
This parameter is used for the SDTMA devices of NSN private protocol. The superior
channel value is 0 in other devices.
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13.2.10 Connected TMA device
Connected TMA device indicates the TMA device that this AISG device object
connected.
13.2.11 Connected RET device
Connected RET device indicates the TMA device that this AISG device object connected.
13.2.12 AISG main control unit
This parameter indicates the RRU device that connects to the 485 control cables of this
AISG device.
13.2.13 Tilt
OMC Path
Interface Path: SDR Configuration Management-> AISG Equipment Central
Management
Open the AISG Centralized Management interface.
Particular Radio Function Feature Description
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Select the NE to be queried on the left topology tree, and right-click Query AISG Device
on the right menu.
The queried AISG devices are listed in the right table.
Right click the AISG of RET, and select “Set Tilt” item of the menu.
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The Set Tilt dialog will pop up. Then set the tilt and click OK.
Parameter Configuration
This parameter specifies the downtilt angle of the electrical tilt antenna.
Particular Radio Function Feature Description
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13.3 Smoothly Cell out off Service Parameter Configuration
OMC Path
Interface Path: View-> SDR Dynamic Data Management, Open the SDR Dynamic Data
Management.
Select the NE to be handled on the left topology tree, and select “Local Cell Object” item
on the center tree, click “Query”, you will see Local cell Objects are listed in the table of
the right panel.
Select the local cell objects that you want to handle in this table, and click the button of
“Local Cell Smooth Block”, then the parameter set dialog will pop up.
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Set the value of “Total Attenuation Time(s)”, click “OK”:
Input the verify code and click “OK”, you will see the result.
Particular Radio Function Feature Description
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Parameter Configuration
The parameter of “total attenuation time(s)” indicates the time before the Local Cell
Objects are blocked.
13.4 Node B Energy Saving Mode Parameter
Configuration
OMC Path
Interface Path: View->Configuration Management -> Configuration Resource Tree->
100001[10.62.44.65:21099] -> test(Subnetwork name) ->aaa$ZXSDR
BS8700(V10.03.01)$0 -> Base Station Config Set 0 -> SdrFunction object(on the left
view)
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Click the records on the right view then Open the “SdrFunction object” interface, you can
configure the parameter “Enable open accumulator-saving mode or not” now.
Particular Radio Function Feature Description
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13.5 Intra-sector RTWP Unbalanced Alarm Parameter
Configuration
Notice that these parameters are configured in EOMS not in OMCB, unlike the
parameters configured below.
EOMS Path:
Interface Path: EOMS-> Base Station (right click) -> Set Base Station Attribute -> other
parameters (tab)
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Notes: red words are alarm parameters.
Parameter Configuration
Reception ant imbalance alarm switch: this parameter controls whether the “Reception
ant imbalance alarm ” enable or not.
Reception ant imbalance alarm threshold (db): this parameter indicates the scene that
the “Reception ant imbalance alarm” appears.
Reception ant imbalance resume (db): this indicates the scene that the “Reception ant
imbalance alarm” resumes.
14 Counter And Alarm
14.1 Counter List
This feature has no related counter.
14.2 Alarm List
14.2.1 Abnormal Power Alarm
Alarm Code
198092758
Alarm Description
abnormal Power
Alarm Severity
Major
Alarm Causes
1. PA is not enabled.
2. PA transmit power is abnormal;
3. RU has a fault.
Particular Radio Function Feature Description
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14.2.2 RET Alarm
Alarm Code 198092688
Alarm Description
RET motor fault
Alarm Severity
Major
Alarm Causes
1.RET motor fault.
2.EMC fault
Alarm Code 198092689
Alarm Description
RET hardware fault
Alarm Severity
Major
Alarm Causes
RET hardware fault.
EMC fault
Alarm Code 198092690
Alarm Description
RET software fault
Alarm Severity
Major
Alarm Causes
Parameter error.
Alarm Code 198092693
Alarm Description
ATMA communication link is interrupted
Alarm Severity
Major
Alarm Causes
1. ATMA device or RET device fault.
2. The communication link between ATMA/RET device and the system has a problem.
3. TAC border fault
4. EMC fault
Note: ATMA communication link is shared by ATMA device and RET device
14.2.3 VSWR alarm
Alarm Code 198092660
Alarm Description
Remote antenna VSWR alarm High
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Alarm Severity
Major
Alarm Causes
1. The antenna failure
2. The board failure.
Note:
15 Glossary
A
ACOM Active Combiner
ACU Antenna Control Unit
AISG Antenna Interface Standards Group
ALPD Antenna Lightning Protect Unit
ANT Antenna
ATMA AISG Tower Mounted Amplifier AISG
ADTMA AISG Dual Tower Mounted Amplifier
ASBT Antenna Smart Bias Tee
B
BT Bias Tee
L
LMT Local Management Terminal
M
MET Mechanical and Man fixed Electrical Tilt
N
NSBT Node B Smart Bias Tee
R
RCU Remote Control Unit
RCS Radio control subsystem
Particular Radio Function Feature Description
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RET Remote Electrical Tilt
RF Radio Frequency Unit
RSSI Received Signal Strength Indicator
RTWP Received Total Wideband Power
S
SNMP Simple Network Management Protocol