Ericsson - (WCDMA RBS 3216)

P5 - Upper limit = 21200 GHz High Edge. Lower limit = 21100 GHz Low Edge.

P6 - Upper limit = 21300 GHz High Edge. Lower limit = 21300 GHz Low Edge

The node-B contains four sub racks namely 1A1, 1A2, 1B1, and 1B2.

Sub rack 1A1 holds the CBU, ET-MFX, RA XB, TXB and the RU-IF boards. 1A2 holds the RU’s, 1B1 holds the PSU’s and 1B2 holds the FU’s.

RBS 3216

Figure 7 and Table 7 show the location and identification of the RBS 3216 components.

Figure 7   RBS 3216 Subrack Identification

Table 7    Key to Figure

Pos. Subrack/Cassette

1A1 Digital subrack

1B1 Power supply subrack

1A2 Radio subrack

1B2 Filter subrack

RBS 3216

Figure 8   RBS 3216 Overview

CBU: The CBU (Control Base Unit) is the heart and brain of the of the Node system.

ET-MFX: The unit is a multiport Ethernet switch blade with IP termination and interworking functionality. It provides six 10/100/1000BASE-T electrical ports on Emily connectors and one connector which can connect an SFP module.Port B of the ET-MFX card connects to the ETH port of the CBU and for external monitoring by NMC, and Port F usually connects to the IP traffic from the transmission equipment Ethernet bridge.

The figure below describes a simple block diagram of ET-MFX.

Figure 2  

The board is composed of two distinct parts:

An 8-port Ethernet switch. There are seven externally available interfaces on the switch, and one interface is connected to the IP Transport block of the board. The seven connectors on the front are divided into six 10/100/1000BASE-T electrical ports using Emily connectors and one port using SFP modules. The switch is non-blocking and supports the Rapid Spanning Tree Protocol (RSTP)-

One of the ports on the switch is internally connected to the IP transport part of the board. This part provides termination of IP traffic and conversion to node-internal formats, as well as distribution of IP traffic using node-internal formats to other boards.

The board supports both NTP server and client mode, also supports UDP terminations but not RTP terminations.

Autonegotiation on the physical layer is supported. For the electrical links, it is possible to negotiate the bandwidth in the range of 10 to 1000 Mbps, including half-rate, but it is also possible to set the bandwidth to a fixed value. For the optical link, it is only possible to negotiate between full duplex and half duplex connections. The board supports automatic MDI/MDI-X crossover detection links.

The throughput of the IPT part of the board is limited to 150 Mbps measured on Ethernet frame level with a frame size of 200 bytes.

TX: The TX board is used for downlink baseband processing such as transport channel handling, encoding, modulation, spreading and channel combining.

TX boards are available with various capacity and capabilities. Extra capacity is added by license keys or by adding more boards for load-sharing up to maximum capacity. Additional TX boards can be added for redundancy when low capacity is required.

The unit has the following functions:

Soft and softer handover Transport channel handling

Encoding Modulation and spreading Physical channel combining

RAX: The RAX (Random Access & receiver) board is used for uplink baseband processing such as deserializing, demodulating, and decoding.

The RAX boards available in an RBS receive uplink data from the mobile device users. The process of incoming data is shared by all RAX boards in the RBS baseband pool.

RAX boards are available with various processing capabilities and demodulation modules. Extra capacity is added by license keys or by adding more boards up to maximum capacity.

To be able to carry HSDPA traffic, all RAX boards in an RBS must be RAX R2 or higher.

The unit has the following functions:

Deserializing Demodulating Decoding

RU: The RU receives digital data from the Baseband, converts the data into analog radio signals, amplifies these and feeds them to the Filter Unit (FU). The RU also receives radio signals from the FU, converts these signals into digital data, and sends them to Baseband. The RU contains the Transceiving Receiving Processing (TRP), Downlink Power Clipping, and power amplifier functions. The unit is of Auxiliary Processor (XP) type.

Function Description

The figure below is a block diagram of the functions employed in the RU21 and the RU22.

Figure 2   RU Functions

The RU:

1. Amplifies the signals received from the FU 2. Performs analog - digital conversion of radio signals 3. Supplies DC power to the FU and to the following: Antenna System Controller

(ASC), Tower Mounted Amplifier (TMA), Remote Electrical Tilt Unit (RETU), and RET Interface Unit (RIU)

4. Performs digital Pre-Distortion 5. Amplifies the signal to the antenna 6. Supplies DC/DC conversion for internal purposes

7. Can issue temperature alarms by means of internal temperature sensors located at critical hot spots

RU-IF: The RUIF is a device board unit used for communication between the Radio Units (RU) and the Baseband (BB) digital subrack. It is directly connected to both the Asynchronous Transfer Mode (ATM) backplane and the BB, while point-to-point cables connect the unit to the RU’s. Communication includes control data, clock signals, and gamma data.

The RU-IF supports up to six RU’s but normally three RU’s are connected.

Function Description

The figure below is a block diagram of the RUIF.

Figure 2   RUIF

The RUIF:

Receives BB clock and Node B Frame Number (BFN) from the Control Base Unit (CBU), and selects one of the two signals

Distributes BB clock and BFN to six RUs Distributes BB clock and BFN to six Random Access and Receiver (RAX)

boards and two Transmitter (TX) boards Transfers control data in RS-485 format to and from six RUs Transfers data in Ross format to and from the RUs for distribution to up to six

antennas Receives six gamma bus lines from the RUs in Uplink (UL), and distributes

each line to six RAX boards Receives six gamma bus lines from the TX boards in Downlink (DL) for

transferring to the RUs, one line to each RU.

Figure 12   RBS 3018, 3107, 3116, 3206M, and 3216, 1×1 to 3×1 RB 1 Configurations

FU: The FU12 is connected between the Radio Units (RU) and two duplex antenna feeder branches, Ant. A and Ant. B, for transfer of uplink (RX) and downlink (TX) RF signals.

Downlink (TX) signals are filtered in the FU before transfer to the antenna and uplink (RX) signals from the antenna are filtered and amplified before transfer to the RU.

The FU also provides DC power for and communication with Antenna System Controller (ASC), Tower Mounted Amplifier (TMA), Remote Electrical Tilt Unit (RETU), and RET Interface Unit (RIU) when these units are part of the antenna system.

In antenna systems where ASC or TMA are not used, the FU provides a basic antenna supervision by feeding a DC voltage to the antenna and monitoring the current.

The FU12 consists of two main physical units:

Radio Frequency (RF) board Duplex and Receiver (RX) bandpass filter

Function Description

The figure below is a block diagram of the FU12.

Figure 2   FU12 Block Diagram

Table 1    Abbreviations in Block Diagram

Abbreviation Expansion

Ant. Antenna

ASC Antenna System Controller

LNA Low Noise Amplifier

RETU Remote Electrical Tilt Unit

RIU RET Interface Unit

RX Receiver

TMA Tower Mounted Amplifier

TX Transceiver

The FU12 has the following main functions:

Filtering the downlink signal

Filtering and amplifying the uplink signal Supplying power to the Antenna System Controller (ASC), Tower Mounted

Amplifier (TMA), Remote Electrical Tilt Unit (RETU), and RET Interface Unit (RIU)

Communicating with the ASC and RETU Supervising the antenna hardware

The RU supplies power to the FU, which in turn supplies power to the ASC, TMA, and the RIU/RETU through the antenna interface. The interface has an over-current protection.

ASC: The ASC consists of two dual duplex Tower Mounted Amplifiers (ddTMA) units for support of two antenna branches and control circuits for an optional Remote Electrical Tilt Unit (RETU). Each ddTMA unit supports one antenna array in a cross-polarized antenna, and is connected to one single TX/RX feeder. The ASC has two antenna ports, two RBS ports, and one RETU port. It can be installed in an upright position on a pole or a flat surface.

Figure 2   Typical Installation of ASC

Main Functions

The main functions of the ASC are the following:

Amplifies RX-signals to compensate for feeder loss Increases uplink coverage Supervises antenna Supplies power to an external unit, such as the RETU Controls an external unit

Function Description

This section describes the function of the ASC.

Figure 3   ASC block diagram

The ASC consists of the following functional blocks:

Bias-T Duplex filter (DPX) Low Noise Amplifier (LNA) DC Supply (DC/DC) Antenna Supervision (Ant Sup) Control and Communication Circuits (Contr.)

Bias-T

The Bias-T separates DC power and control signals from radio frequency signals in the feeder from the RBS. It feeds the DC power to the DC Supply and the control signals to the Control and Communication Circuits. The radio frequency signals are fed to the Duplex Filter.

Duplex Filter

The two Duplex Filters separates the RX and TX signals. RX signals are fed from the antenna to the Low Noise Amplifier and TX signals from the RBS are bypassed to the Duplex Filter at the other end of the signaling path.

Low Noise Amplifier

The Low Noise Amplifier amplifies the RX signal. The amplification of the Low Noise Amplifier is adjustable by software settings in the Control and Communication Circuits to compensate for variable feeder length.

DC Supply

The DC Supply converts the voltage supplied via the feeders to necessary internal voltages. Power to external equipment (RETU) is also provided. Power is fed to the DC Supply through feeder A, feeder B or both.

Antenna Supervision

The antenna is supervised by a directional coupler which monitors Voltage Standing Wave Ratio (VSWR) and forward power. This information is sent to the RBS.

Control and Communication Circuits

The Control and Communication Circuits convert the Frequency Shift Keying (FSK) signaling on the feeders to RS 485 or from RS 485 to FSK. They also control Low Noise Amplifier and RETU and supervise the antennas.

CONNECT ION TO RBS

Download Element Manager Software from RBS, install and run. Use link below in your browser when connected to the node B.

http://ip-addr/em/index.html

1. Note the IP-address of RBS and configure network settings of your PC accordingly.2. Connect a cross Ethernet cable to the ETH port on the CBU.3. Open Element Manager, enter the RBS IP-address and hostname, click Add and Connect.

See picture below.

Restarting RBS, see screenshots below;