Antenna Electrical Specifications
Overview
The active antenna unit (AAU) is a new type of RF module following the RFU and RRU. It incorporates the functions of RRUs and conventional antennas and requires less site resources.
Figure 1-1 Evolution of Huawei base stations
The AAU5611 is one of Huawei's main products that implement massive MIMO in NR and LTE TDD networks. The following figures show the position of the AAU5611 in NR and LTE networks, respectively.
Figure 1-2 Position of the AAU5611 in the NR network
Figure 1-3 Position of the AAU5611 in the LTE network
The AAU5611 supports 64T64R. With a sharp increase in transmit and receive antenna channels, this product provides greater diversity, array, spatial multiplexing, and interference suppression gains. This helps operators to maximize the use of existing site and spectrum resources, enhance the system performance, and improve wireless network capacity.
Product Characteristics
Leading Performance
l Multiple channels
The AAU5611 uses the massive MIMO technology and supports 64T64R. Massive MIMO features the adoption of massive antenna arrays for joint signal reception and demodulation or transmission, and therefore significantly enhances single-user link performance and multi-user spatial multiplexing capability, and improves system link quality and transmission rates when compared with traditional multiple-antenna technologies. Massive MIMO also enables the system to flexibly adjust beam forms in both the horizontal and vertical planes, significantly enhancing 3D coverage capability.
l High power
The AAU5611 adopts the industry-leading power amplification technology, Huawei-developed IF and RF chip, and unique antenna element technology. The module features high power, large bandwidth, and small size. The advanced power amplification technology achieves a maximum of 160 W power and supports a wider coverage area.
High Integration
l Light weight and small size
The AAU5611 integrates the functions of antennas and RF modules with a total weight of 47 kg and a small size (965 mm x 470 mm x 220 mm). Its weight and dimensions are far less than those of the traditional RRU+antenna solution.
l Small frontal area
The frontal area (965 mm x 470 mm) of the AAU5611 is smaller than that of a common antenna.
l Flexible deployment
The integrated design of the AAU5611 saves the jumper, external combiner, and the installation space required by the RRU. This simplifies the antenna installation platform and enables flexible deployment. Its support for 3D beamforming and tilt adjustment reduces requirements on the antenna height and facilitates installation.
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System Architecture
3.1 Exterior
3.2 Physical Ports
3.3 Logical Structure
Exterior
Figure 3-1 shows the AAU5611 exterior.
Figure 3-1 AAU5611 exterior
Physical Ports
Figure 3-2 describes the physical ports on an AAU.
Figure 3-2 AAU5611 physical ports
Table 3-1 Ports on an AAU
| Silkscreen | Protocol | Connector | Quantity | Description |
| CPRI0 | eCPRI protocol | SFP | 1 | Connects to a BBU. Maximum rate: 25 Gbit/s |
| CPRI1 | eCPRI protocol | SFP | 1 | Connects to a BBU. Maximum rate: 25 Gbit/s |
| Input | N/A | EPC9 | 1 | Power input port |
| Aux | AISG 2.1 | DB9 | 1 | Connects to an external antenna information sensor unit (AISU) module. |
Logical Structure
An AAU integrates the antenna and RF unit. Its main function modules include the antenna unit (AU), radio unit (RU), power module, and L1 processing unit.
Figure 3-3 shows the AAU logical structure.
Figure 3-3 Logical structure
Table 3-2 describes function modules of an AAU.
Table 3-2 Function modules of an AAU
| Function Module | Function Description |
| AU | Each antenna supports 96 dual-polarized elements to transmit and receive radio waves. |
| RU | l Performs down-conversion, amplification, analog-to-digital conversion (using the ADC), and digital IF processing for RF signals through the RX channel. (ADC is short for analog to digital converter, and IF is short for intermediate frequency.) l Performs filtering, digital-to-analog conversion (using the DAC), up-conversion, and analog signal amplification for downlink signals through the TX channel. (DAC is short for digital-to-analog converter.) l Performs phase calibration for uplink and downlink RF channels. l Provides –48 V DC power supply port. l Provides protection and filtering functions. |
| Power module | Supplies the operating voltage to the AU and RU. |
| L1 (physical layer) processing unit | l Implements the uplink and downlink processing at 5G NR and LTE TDD physical layers. l Weights the channels. l Provides eCPRI ports to converge or distribute eCPRI signals. |
Technical Specifications
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4.1 Frequency Band
4.2 Antenna Electrical Specifications
4.3 Mechanical Downtilt Supporting Arm
4.4 Capacity
4.5 eCPRI Port Specifications
4.6 Output Power
4.7 Static Sensitivity
4.8 Power Consumption
4.9 Power Supply
4.10 Equipment Specifications
4.11 Environmental Specifications
Frequency Band
Table 4-1 AAU5611 LTE TDD frequency band
| Frequency Band | Frequency Range | Carrier Bandwidth (MHz) | IBW | OBW |
| 2600 MHz | 2575 MHz to 2615 MHz | 20 | 40 MHz | 40 MHz |
Table 4-2 AAU5611 NR frequency band
| Frequency Band | Frequency Range | Carrier Bandwidth (MHz) | IBW | OBW |
| 2600 MHz | 2575 MHz to 2615 MHz | 20 | 40 MHz | 40 MHz |
Antenna Electrical Specifications
Table 4-3 Antenna electrical specifications of the AAU5611 NR
| Item | NR Specifications |
| Frequency range | 2575 MHz to 2615 MHz |
| Polarization mode | +45° and –45° |
| Gain | 24.8 dBi |
| Horizontal sweeping range of broadcast beams | –60° to +60° |
| Vertical sweeping range of broadcast beams | –15° to +15° |
| Number of antenna elements | 192 |
Table 4-4 Antenna electrical specifications of the AAU5611 LTE TDD
| Item | LTE TDD Specifications |
| Frequency range | 2575 MHz to 2615 MHz |
| Polarization mode | +45° and –45° |
| Gain | 24.8 dBi |
| Horizontal beamwidth adjustment range of broadcast beams | 15° to 90° |
| Vertical beamwidth adjustment range of broadcast beams | 6.5° to 27° |
| Number of antenna elements | 192 |
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