Active Antenna Introduction

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Active Antenna Introduction

www.huawei.com

Author/ Email: Giambattista Capirchio Version: V1.0(20YYMMDD) HUAWEI TECHNOLOGIES CO., LTD.

Contents 



Product Overview 

AAU3902



AAU3911

Italy VDF introduction

Product overview – AAU3902 

Hardware Structure



Features and benefit

HUAWEI TECHNOLOGIES CO., LTD. Huawei proprietary. No spread without permission. Page 3

AAU3902 - Hardware Structure AU module

1.8 RU module PIU-S/PIU-2R module 2.1 RU module

–48 V power MU input module

1.8RU indicator

Two CPRI ports

High-frequency 1.826 ANT2 DIN port

2.1 RU indicator

A pair of AISG ports

MU indicator Low-frequency 900 MHz ANT1 DIN port


AAU3902 - Equipment Specifications Item

AAU3902

Dimensions

2000 mm x 350 mm x 260 mm

Weight

Single frequency band: 51 Kg Dual-frequency band: 60 Kg

EIRP

2.1 GHz 2x40 W+17 dBi antenna gains 1.8 GHz 2x40 W+16.7 dBi antenna gains

Receiver sensitivity

U2100: –125.8 dBm G1800: –114 dBm L1800: –106.6 dBm

Transient working bandwidth

2100 MHz: 40 MHz G1800: 35 MHz

Specifications

L1800: 40 MHz Number of channels

4T4R

Power consumption

Single frequency band: Typical power consumption: 405 W Maximum power consumption: 445 W Dual frequency bands: Typical power consumption: 745 W Maximum power consumption: 830 W

Power supply

–48 V DC (–36 V to –57 V)

Maximum wind resistance

980 N/650 N/960 N at 150 km/h

Front/lateral/rear

1650 N/110 N/1500 N at 200 km/h


AAU3902 - AU Specifications of an AU

Antenna unit (AU) is a 2H1L antenna, which is the major bearer of an AAS module. Mounting brackets, RU, MU, and PU are installed on the AU. An AU02 provides the following parts and functions: 1.

Enclosure frame and radome

2.

Antenna element

3.

Reflection panel

4.

Lowfrequency passive antenna

Antenna

H L (2 m) H(1.4 m)

Frequency Band

Highfrequency passive antenna

Highfrequency active antenna

790 MHz to 1710 MHz to 1710 MHz to 2690 MHz 2690 MHz 960 MHz

Antenna Gain

16 dBi

17 dBi

17 dBi

Feeding network

Vertical Beamwidth

10o

4 to 6o

4o to 6o

5.

Phase shifter

65o

65o

65o

6.

Driving mechanism of the RET

Horizontal Beamwidth RET Adjustment Range

0 to 10o

2o to 10o

0 to 12o

7.

High-speed blind-mate ports for the communication between AUs and CMs,

between AUs and RUs, and between AUs and

8.

Passive: 1710 to 2690 MHz

Active: 1710 to 2690 MHz

Passive: 790 to 960 MHz

–3, –1.5, 0, +1.5, +3

Mechanical Tilt

PIUs

Slot 1

N/A

N/A

Blind-mate RF ports: There are four RF ports

Slot 3

N/A

N/A

on each active module. The four RF ports are connected to the blind-mate connectors on

antennas.


1920 MHz to 2170MHz 1710 MHz to 1880 MHz 2500 MHz to 2690 MHz

AAU3902 - RU Specifications of 2100-1800 MHz RU

A radio unit (RU) is an active RF module, which uses 4T4R and supports two TRXs for one antenna polarization. The

Item

circuit is basically the same as that of an RRU. The 2100

Frequency Band

MHz RU delivered in this version has the following parts and functions: 1.

RU44-2.1 GHz

RU44-1.8 GHz

1920 MHz to 1980MHz

1725 MHz to 1785MHz

2110 MHz to 2170MHz

1820 MHz to 1880MHz

Channel processing, clipping, and digital IF signal

Working Mode

UMTS

GSM or LTE

processing such as DPD

Hardware Structure

4T4R

4T4R

Output Power

2x40 W

2x40 W

Power Consumption

405 W

405 W

Receiver Sensitivity/Single Channel

–125.5 dBm

GSM: –114 dBm

Receiver Sensitivity/Four Channels

Cannot be tested

Cannot be tested

Carrier

8 (1T2R) or 4 (2T2R, 1T4R, and 2T4R)

GSM:8 (1T2R) LTE: 2 (2T2R, 2T4R, and 4T4R)

Transient Working Bandwidth

40 MHz/PA, 60 MHz/Rx

GSM: 35 MHz/PA LTE: 40MHz/PA, 60 MHz/Rx

Duplexer Bandwidth

60 MHz

60 MHz

Power Supply

–48 V DC (–36 V DC to –57 V DC)

–48 V DC (–36 V DC to –57 V DC)

2.

TX and RX RF links processing

3.

Active antenna calibration and compensation

4.

DBF parameter configuration

5.

Antenna polarization

6.

Local operation and maintenance for RUs DPD

Channel correction

SD6212

•T/R IQ •Connect ed to the MU

FPGA Channel correctio n DBF SEDES Maintena nce and test

IF handl ing

CPU

Clock and local frequency

Power supply

RF PA RF RF Channel PA PA Channel PA RF Channel Channel RF LN RF RF LNA Channel LN Channel RF Channel LNAA Channel A

•Blind-mate RF connector •Connected to the antenna port on the AU

LTE: –106.6 dBm


AAU3902 - MU A management unit (MU) is the common management of an AAU, which has the following parts and functions: 1.

CPRI convergence and distribution

2.

Ports for power supply and CPRI hardware

3.

Light protection, slow start-up, electromagnetic

Protection and filtering Power supply Fan control

interference (EMI) prevention, and filtering

Clock

4.

AAS O&M and RU management

CPU

5.

Control of the antenna built-in motor and level-2 phase shifter

6.

Control of the PU (with motor)

•T/R IQ and power •Connected to slot 3

FGPA CPRI deframing CM controls frame forming Maintenance and test SERDES

CPRI



–48 V

Logical Structure of an MU


AAU3902 RET Scheme High-frequency active array

Low-frequency passive array + phase shifter

High-frequency passive array + phase shifter

Active unit

V2D6 V network

CMB1

2.1A

1.

TRX TRX

2.

TRX TRX

3. 4.

Level-2 phase shifter

1.8/2.6A CMB2

TRX TRX

5.

TRX TRX

LVTTL

Motor1 Motor 2

Motor 3

Motor control

CM

RS485

Passive motor control Phase shifter on the antenna

Hierarchical control for motors

6.

The RET of the 3-array antenna can be controlled independently. Only inner control is supported for the highfrequency active array. Inner and outer controls are both supported for the passive arrays. Inner control depends on the CPRI port. The MU performs the interpretation and hierarchical control for the motors. The antenna has three motors controlling the three arrays, respectively. The motors are controlled by one remote control unit (RCU). Outer control is performed through a pair of outer multi-core ports at the bottom of the antenna. The ports can be cascaded. One multi-core control channel is provided in the antenna controlling the motors of the two passive arrays. The channel supports cascading and is identified by a serial number. Outer control does not support the OOK port. When outer passive modules use the OOK ports, connect the SBT to the antenna to isolate and demodulate the OOK signals.

CPRI


AAU3902 Benefit

Capacity

Enabling flexible combinations of multiple sectors and RF channels

Architecture

Site Requiring less antenna space and reducing boxes

Coverage

Achieving wide and deep coverage


Site Solution Cost Saving Item

Space

Benefit

Advantage (comparing with the RRU)

1. Saving antenna space

1. Antennas support multiple frequency bands and modes.

Materials

2. Saving lease costs 1. Reducing installation duration 2. Reducing shutdown duration Not requiring feeders

Consumption

Reducing cable losses

Maintenance

Reducing maintenance costs

Time

2. Only one box is required. Feeders are not required.

1. Feeders are not required. The cable loss between the AARU and AAAU is small 1. Incorrect feeder connections are prevented. 2. Alarms related to the VSWR and antennas are prevented.


Capacity Solution Capacity Measure Expansion Method More spectrum resources

Supported by the AAS Module

Add more frequencies.

Yes

Add more frequency bands.

Yes if AARUs operating the related frequency bands are installed

Multiple sectors: transition from three-sector to six-sector;

Yes. A single AAS module can support two sectors. A single AARU supports different sector combinations.

Multiple channels: transition from 1-channel to 2channel and then to 4-channel; four-way transmit Networking: or receive diversity multiple sectors/channels/s Multiple sites: short distance between sites ites, or Hetnet

Yes. A single AAS module supports four RF channels and therefore can achieve four-way receive or transmit diversity. A single AARU supports different RF channel combinations. Yes

Frequency reuse (GSM only): transition from 4x3 Yes to 1x3 Hetnet: mini base stations, indoor-coverage base No, except for mini or pico base stations that use AAS modules stations, WIFI, and Femto Yes Interference cancellation and suppression Features

Inter-RAT refarming

Higher order modulation and demodulation: HSPA+, EDGE Yes Carrier aggregation (LTE only) Signaling traffic bursts: O&M Link Backup, Yes Capacity Optimization for Small-Packet Services Transfer spectrum resources to advanced modes Yes Spectrum resources sharing Power resources sharing

Yes Yes


AAU3902 Features  Vertical Multiple Sectors - increases site capacity.  4-Way Receive Diversity - increase uplink capacity.  User Specific Tilt - increase system capacity.


Vertical Multiple Sectors Application Scenarios 

The downlink load of the target cell has reached or exceeded the downlink load threshold (70%) for capacity expansion.



In densely-populated urban areas, the site height higher than 25 m is recommended, and the distance between two eNodeBs is about 500 m.



In common urban areas, the site height higher than 30 m is recommended, and the distance between two eNodeBs is less than 1000 m.



The Cell A downtilt angle on the site is smaller than or equal to 10°.



Traffic is available near the site. Deploy this feature in scenarios where traffic in inner cells accounts for 40% to 80% of the total traffic.

CELL A’

CELL A

Solution 

The Vertical Multiple Sectors feature splits a sector served by AAS modules into an inner sector and an outer sector. The inner and outer sectors correspond to an inner cell and an outer cell, respectively. These cells use the same frequency but have overlapping areas.

Benefits 

This feature cover the area with one more sector to let users reuse radio resource which may lead to increase on capacity without adding frequencies or RF modules. In the user non-uniform distributed scenario, the gain is as follow.



UMTS: Increases network capacity by 30% to 70% compared with the capacity of a site in a horizontal three-sector networking.



LTE: Increases network capacity by 20% to 40% compared with the capacity of a site in a horizontal three-sector networking.

Specifications and Limitations 

The cells served by this feature do not support four-way receive diversity due to limited capabilities of AAS modules.



AAU3902 is required.


Vertical Multi-Sector DL Capacity Gain DL Cell Average Throughput for Full Buffer 30-70%

3 Sector  Scenario: Non-uniform UE distribution, Hotspot located close to site, More UE located in inner cell  Using the beamforming technology to split a sector into an inner and an outer sector, this feature doubles

UMTS

20-40%

3 Sector

LTE

UL Cell Average Throughput for Full Buffer 50-100%

30-60%

cell resources and increases the average cell throughput

Impact on KPI

3 Sector

3 Sector

 After cell split, the cell edge user RSRP will decreased due to the transmit power shared with inner cell and outer cell.  After cell split, the user SINR will decreased about 2 to 3 dB especially in the over shooting area of inner cell

UMTS

LTE

 In the burst service, the user average throughput gain will smaller than that in full buffer service.

and outer cell.


Virtual Four Uplink Channels (Vertical)

Application Scenarios 

Uplink capacity is limited and no extra frequencies are available, such as in densely populated areas.



There are no problems such as service drop or access failure due to coverage.



The uplink interference over thermal (IoT) in the cell is high.

Solution 



The Vertical Four Uplink Channels feature enables four-way receive diversity for a sector by allocating four connection ports to the sector vertically. Without this feature, conventional RRUs or RFUs must use two sets of dual-polarized antennas to enable fourway receive diversity.

This feature provides extra receive diversity gains and array gains, thereby increasing the uplink throughput and network capacity

Inner beam

Area 1

Benefits

4RxD

Area 2

Outer beam

Area 3

Note  1) The interference between areas 1 and 3 is small due to the gap area: area 2.  LTE: Compared with two-way receive diversity, this feature helps increase uplink capacity  2) UEs in area 2 obtain four-way receive by 10% to 45%. diversity gains because their signals can be received by inner and outer beams. Specifications and Limitations  3) The RoT for the average uplink load specific to four-way signals is twice larger than the RoT  The cells served by user specific tilt and four-way receive diversity, and do not support the for the average uplink load specific to two-way Vertical Multiple Sectors feature due to limited capabilities of AAS modules. signals. 

UMTS: Compared with two-way receive diversity, this feature helps increase uplink capacity by 40% to 60%.


Virtual Four Uplink Channels (Vertical) Capacity Gain

Cell Average Throughput for Full Buffer Service 40-60%

 AAS Virtual 4 Channels

Benefits

10-45%

 Improve receiver sensitivity and uplink coverage.

2Rx

2Rx

UMTS 4Rx

LTE 4Rx

User Average Throughput for Burst Service

V4R VS 2R User Avg. Tput Gain  With 4 antennas per sector for  Using the beamforming technology， two vertical beams which radiate at +45° polarization and at -45° polarization  In area B where these two beams

Gain(%)

receiving

50.00% 45.00% 40.00% 35.00% 30.00% 25.00% 20.00% 15.00% 10.00% 5.00% 0.00%

5%

10%

50%

70%

max

10.03%

10.19%

29.54%

43.97%

min

6.03%

7.60%

21.79%

34.44%

overlap, the function enables four-way receive diversity


User Specific Tilt (LTE Only) Application scenario  

  

Cells selected for user specific tilting provide continuous coverage. There are no coverage problems, or there are coverage problems but the problems are not serious, for example, in densely populated urban areas. In densely populated urban areas, the site height is higher than 25 m, and the distance between two eNodeBs is equal to or less than 500 m. In common urban areas, the site height is higher than 30 m, and the distance between two eNodeBs is less than 1000 m. The downtilt angle on the site is smaller than or equal to 10°. There is traffic in cell centers. UEs support 4x2 or 4x4 closed-loop MIMO.

Solution 

The AAS can use an active antenna to form two transmit beams in each polarization direction for a total of four transmit beams in the two polarization directions. Together with LOFD-001003 DL 4x2 MIMO or LOFD-001060 DL 4x4 MIMO in closed-loop mode, the AAS generates four downlink channels on the vertical plane in a cell.



As shown in Figure , the red beam is a wide beam generated for control channels and the other three beams are narrow beams generated for traffic channels. These narrow beams are formed for different UEs based on the precoding matrix indicators (PMIs) reported by these UEs and the associated codebooks. For the server cell, the UST has beamforming gain, and for the neighbor cell, the UST has inter cell interference reduction gain.

Benefit 

This feature increases the signal power of UEs close to the AAS and reduces the interference with other cells, thereby increasing system capacity.

Specification and restriction 

The cells served by user specific tilt and four-way receive diversity, and do not support the Vertical Multiple Sectors feature due to limited capabilities of AAS modules.


User Specific Tilting DL Capacity Gain（LTE Only） Cell Average Throughput for Full Buffer Service 15%~30%

User Specific Tilting

2×2

PMI 1

PMI 2

PMI 3

PMI 1

PMI 2

PMI 3

User Average Throughput for Burst Service UST 4x2 VS 2x2 User Avg. Pcv Tput Gain 

According to the Uplink PMI feedback from UE, The user level beam-forming will be Created.



Different Beam will Randomize Intra-frequency interference.

30% 25% 20% 15% 10% 5% 0%

5%

10%

50%

70%

max

7.28%

10.96%

24.26%

26.64%

min

3.14%

6.93%

10.70%

17.99%


Executive Summary for AAU3902 Field Trial Vertical 4 Receive Diversity

Vertical Multiple Sector

AAU3902 is a new type of antenna which differently from traditional passive modules allows to enable advanced beamforming functions in accordance with our needs . Below the results reached for each of active features tested:

1. V4R(Virtual Four Receive Diversity) can bring an average UL gain about 33% and achieve up to 40%. Moreover in static test there is a gain up to 45% in UL Throughput and UE TX power saving up to 5 dBm. 2. VMS can bring an average utmost UL capacity gain about 61% based on the network condition of trial site and achieve up to 89%. VMS can bring an average DL capacity gain about 131% and achieve up to 195%.

UL/DL Different Tilt

3. Although based on simulation UL/DL tilt has no benefit for the twosectors the feature has been tested. No degradation for main KPI: improvement in terms of DCR HSXPA and HSDPA_RAB failure rate


Product overview – AAU3911 

Hardware Structure



Features and benefit


Hardware Structure - AAU3911 Mounting Upper kit handle

Plastic cover

Plastic cover bracket

RU in the upper slot

AU

RU in the lower slot Lower handle HUAWEI TECHNOLOGIES CO., LTD. Huawei proprietary. No spread without permission. Page 23

Equipment Specifications of AAU3911 Item

AAU3911

Dimensions

With metal cover: 2020 mm (H) x 359 mm (W) x 290 mm (D) (79.53 in. x 14.13 in. x 11.42 in.)

Weight

Single frequency band: about 49 Kg Dual frequency bands: about 63 Kg 2 x 64.8 dBm (1.8 GHz/2.1 GHz) 2 x 64.8 dBm (AWS including Combiner) 2 x 63.5 dBm (2.6 GHz) 1.8 GHz GO/GL: 35 M; LO: 40 M 2.1 GHz UO: 60 M AWS UL: 45 M 2.6 GHz LO: 50 M 2T4R (AWS/2.1 GHz/2.6 GHz) 2T4R' (1.8 GHz/2.1 GHz) Single Band A: about 330 W (2.6 GHz 2T4R) to 385 W (2.1 GHz/AWS 2T4R) to 350 W (2.1 GHz 2T4R'/1.8 GHz 2T4R') -48 V DC (-36 V to -57 V)

EIRP

Instantaneous Bandwidth

Specifications Number of Channels Power Consumption

Power


Introduction to Functional Modules of AAU3911 Functional modules of AAU3911 consist of the active module RU and the antenna module AU. An RU is an RF unit, which transmits and transforms signals between BBU and the antenna system. The types of RU

include: Power Consumption Bandwidth Power (100% Load)

RU

Frequency Number Code Band of TR

RU3832

2100

2T4R

02310PPY 385 W

RU3832

AWS

2T4R

02310QNU 385 W

Sensitivity

UMTS: -126.1 dBm UMTS: UO: 60 MHz -126.1 dBm 2 x 60 W LO: 50 MHz LTE: -106.5 dBm UO: 60 MHz 2 x 60 W

RU3952m 1800

2T4R' 0231XXXX XXXW

GO/GL: 35 1800: GSM: -114.0 dBm MHz 2 x 40 W LTE: LO: 40 MHz -106.5 dBm

RU3952m 2100

2T4R' 0231XXXX XXXW

UO: 60 MHz 2 x 60 W

RU3260

2T4R

LTE: LO: 50 MHz 2 x 40 W -106.5 dBm@ (1T1R 25 RB)

2600

02310QER

330 W

UMTS: -126.1 dBm

An AU is an antenna unit, which is the main bearing part in AAU3911. The AU can be categorized into four types according to the frequency band that it supports. AU

AU11Ia AU11Ib AU11Ic AU11Id

Frequency Band in the Upper Slot (MHz) 2500 to 2690 1710 to 2690 1710 to 2170 2305 to 2360

Frequency Band in the Lower Slot (MHz) 1710 to 2170 + 690–960 690–960 2500–2690 + 690–960 2500–2690 + 690–960


Introduction to Functional Modules of AAU3911 — RU AAUs can use three types of RUs: RU of 2T4R, RU of 2T2R, and RU of 4T4R, which support different numbers of receiving and sending channels. The main functions of RU are as follows: 1.

Receives downlink baseband data from the BBU and transmits uplink baseband data to the BBU,

enabling communications between the RU and the BBU. 2.

Receives RF signals from the antenna system, down-converts the received signals to IF signals, amplifies the IF signals and performs ADC. The TX channel filters downlink signals, performs DAC and up-converts RF signals to the TX band.

3.

Provides the duplexing function for RF channels, enables RX signals and TX signals to share the same antenna path, and filters the RX and TX signals.


Exterior of RU

4T4R/2T4R

2T2R


Introduction to Ports of RU — 2T4R/4T4R Item

Silkscreen

Remarks

(1) Ports in the cabling cavity

RTN (+)

Power port

(2) Ports at the bottom

NEG (-)

CPRI0

Optical/electrical port 1

CPRI1

Optical/electrical port 1

ANT_TX/RXA

TX/RX port A, supporting RET signal transmission

ANT_RXC

RX port C

ANT_RXD

RX port D

ANT_TX/RXB

TX/RX port B

EXT_ALM

Alarm port

RET

Communication port for the RET antenna, supporting RET signal transmission

The difference between the ports on 2T4R and 2T2R RUs lies only in the number of RF ports at the bottom. Other ports including those for power, CPRI, RET, alarm, and indicator are the same. Ports of 4T4R and 2T4R RUs are the same. On the 4T4R RU, port C and port D can be shared between RX and TX.


Introduction to the Components of AAU3911 — AU The functions of the AU are as follows:

Provides an antenna array and a feeder, phase shift network and transmission system. Provides the built-in antenna motor to control the circuit. Provides antenna capability information, combiner types, and RU in-position

information reporting. Provides overall installation and RU installation ports. Provides passive ports for RRUs and RFUs.


Exterior of AU


Electrical Parameters of AU AU Electrical Parameter

65

1920– 2170 17.5 63

Vertical 3 dB Beam Width (°)

9.5

6.4

Side Lobe Suppression for First Side Lobe Above Main Beam (Typ.) (dB)

>17

>17

>25

>25

Frequency Range (MHz)

690–820

790–862

824–894

880–960

Gain (dBi)

15

15.5

15.5

16

1710– 1880 17

2500– 2690 18

Horizontal 3 dB Beam Width (°)

Front to back ratio, copolar (Typ.) (dB)

Polarization

+45°, -45°

Electrical Downtilt (°)

0 - 10°, continuously adjustable <1.5

VSWR

Intra-system: ≥ 28 Inter-system: ≥ 28 (typ: 30)

Isolation Between Ports (dB) Maximum Input Power per Port (W) Maximum Total Input Power (W)

Intermodulation IM3 (dBc) Impedance (Ω) Grounding

80 160

80 0 ≤ -153 (2 x 43 dBm carrier) 50 DC Ground

Note: The 0.3 dB loss of combiner needs to be considered for counting the gain of an AU with a built-in combiner.


Types of AU AU11Ia

2500 to 2690

1710 to 2690

1710 to 2170

690 to 960

AU11Ic

AU11Ib

690 to 960

AU11Id

1710 to 2170

2305 to 2360

2500 to 2690

2500 to 2690

690 to 960


690 to 960

Diagram of the System Logical Relationship of AU Module Dimensions of the semi-integrated antenna (L x W x D): 2000 mm x 359 mm x 151 mm (not including the

plastic cover) Weight of the antenna: 30 Kg (including the cover; not including the handle, the installation conversion bracket and so on) Different dual-polarized antenna arrays are installed side by side, including two high-frequency antenna arrays and one low-frequency antenna array, where one high-frequency antenna array is coaxial with the lowfrequency antenna array. High-frequency combiners at the array level are built in, supporting shared use of RF array and phase shift feed network. The degree of downtilt freedom (number of independent tilts) is 3.


Description of Ports on the AU

2

1

6

No.

5

4

3

Name Number Ports Remarks RU RF port in the ANT_TX/RXA, ANT_TX/RXB, ANT_TX/RXC, In the middle of the 1 4 upper slot ANT_TX/RXD back of the antenna RU AISG port in the In the middle of the 2 1 AISG IN FOR RU upper slot back of the antenna ANT_TX/RXA, ANT_TX/RXB, ANT_TX/RXC, RU RF port in the At the bottom of the 3 6 ANT_TX/RXD (high band), ANT_A, ANT_B (low lower slot antenna band) RU AISG port in the At the bottom of the 4 1 AISG IN FOR RU lower slot antenna At the bottom of the 5 P RRU AISG port 1 AISG IN antenna P RRU AISG At the bottom of the 6 1 AISG OUT cascading port antenna


Logical Principle of AAU3911 RET The RET of AAU3911 antenna is realized through the AISG. The antenna has

Antenna

three built-in logical RCUs for remote adjustment of the three antenna tilt angles. The RET system provides four AISG ports. Two of the AISG ports are Phaser

for tilt adjustment of active RUs in the upper and lower slots, and the two

Subunit1

ports are located in the middle and at the bottom of the antenna. The other

Subunit2

two AISG ports at the bottom of the antenna are for the passive tilt

Subunit3

adjustment or RRU cascading. Each logical RCU has its RCU ID. For the logical RCU, software design constraints are as follows:

RU-A(U) RU-A(D) RRU-P

AISG

•Each RCU can set up only one AISG link. Two links cannot be set up.

RCU1 RCU2 RCU3

MOT

•After the RCU link is established, the RCU serial number is not displayed in the scanning result of other RET ports. •The internal logical RCUs, which do not have links, can be scanned by any

•When TX and RX channels share an antenna, the TX RU controls the antenna array tilt angle. •If two TX channels share one antenna in the outgoing feeder, the active RU controlling the

RET ports. •The link setup complies with the first-come-first-served principle. If you

want to switch to another configuration, you must disconnect the established link at first. And then, it can be used.

antenna tilt array is recommended.


RF Cable Connections of AU11Ic

The ones on the left part correspond to the connection in the upper slot. The ones on the right

part correspond to the connection in the lower slot.


Functions and Features of AAU3911 AAU3911 integrates functions of the RF module into the antenna. The features of AAU3911 are as follows: 

A maximum of two active bands can be integrated in AAU3911.



Compared with traditional RRUs, AAU3911 can reduce the jumper loss by about 0.8 dB and save 10% of power by integrating RF modules into the antenna.



AAU3911 adopts the modularized structure and supports fast installation and

maintenance, reducing product delivery time. 

AAU3911 supports uplink 4-way receive diversity, eliminating the bottleneck of uplink receiving capacity.



AAU3911, as an active antenna unit, can be connected to RRUs or RFUs in the live network.



AAU3911 has strong evolution ability. It is convenient to evolve from 2T2R to 2T4R and from 1A+2P to 2A+1P.


High Integration and Simplified Sites

15 Boxes 6 Boxes 6 Antennas

Clean Site

2 Active bands integrated (2.1 GHz+1.8 GHz)

9 RRUs

3 RRUs

Fewer Boxes

Lower OPEX

Site

Traditional RRU

AAU3911

Scenarios: S111 site, UMTS (2.1 GHz) + LTE+GSM (1.8 GHz) + GSM (900 MHz)

rental reduced Site design and installation simplified Maintenance fee saved…


Less Feeder Loss and Power Consumption

AAU Solution

0

Feeder loss

(decreased by 0.8 dB) 3 dB cable loss

0.8 dB jumper loss (5 m)

Power and CPRI


10% power saving

Increased Uplink Capacity Four-way Uplink Receive Diversity  With 4 antennas

60% Increase AAU3911 2Rx

per sector for

4Rx

receiving

Average Cell Throughput

2Rx -> 4Rx

Commercial trial network of operator XXX (2012)


AAU3911 Feature & benefit  Inter-Frequency Mutual Aid - in dual band network reduces the costs for implementing the 4 Antenna receive diversity


Inter-Frequency Mutual Aid The Inter-Frequency Mutual Aid feature allows a radio frequency (RF) module to receive and transmit signals on one frequency band and receive signals on another.


Inter-Frequency Mutual Aid - Modules

AAU3911 can work with RU3952m at 1800MHz and 2100MHz


Inter-Frequency Mutual Aid - Benefits The Inter-Frequency Mutual Aid feature achieves dual-band four receive (RX). When used in newly deployed dual-band networks or during transitions from single-band networks to dual-band networks, this feature requires fewer external combiners or antennas, reducing costs.


Inter-Frequency Mutual Aid - Benefits The Inter-Frequency Mutual Aid feature achieves dual-band four receive (RX). When used in newly deployed dual-band networks or during transitions from single-band networks to dual-band networks, this feature requires fewer external combiners or antennas, reducing costs. Common scenario

Inter-frequency mutual aid scenario


FOA AAU3902 scenario Active antenna configuration

o LTE1800 V4R + UMTS2100 VMS (V4R)

Passive antenna configuration o LTE800 + GSM900 + LTE2600


FOA AAU3902 scenario RU1800

48V

BBU UMTS

DCDU

FA N

UPE U

WBBPf3 WBBPf3 WBBPf3

UMPTb2

UPE U

RU2100

Iu-b (IP) + S1/X2 (IP)

MU CPRI BBU GL

DCDU UCIU 800-900 MHz

FA N

LBBPd2 GTMU LBBPd2 LBBPd1

UMPTb2

UPE U

CPRI A-bis (TDM) TMA 800900


FOA AAU3911 scenario Active antenna configuration

o LTE1800 2T4R’ + GSM1800 2T2R + UMTS2100 2T2R

Passive antenna configuration o LTE800 + GSM900 + LTE2600


FOA AAU3911 Scenario 48V CPRI

RU3952m 2T4R’ (1800)

CPRI

BBU UMTS

DCDU WBBPf3

FA N

WBBPf3 WBBPf3 WBBPf3

UMPTb2

48V

UPE U

UPE U

CPRI Iu-b (IP) + S1/X2 (IP)

RU3952m 2T4R’ (2100)

CPRI BBU GL

DCDU UCIU 800-9000 MHz

FA N

LBBPd1 GTMU LBBPd2

UMPTb2

UPE U

A-bis (TDM) 2600 MHz non usato


TMA 800900

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Active Antenna Introduction

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