Ericsson RBS 2207 Instruction sheet

EN/LZT 720 0135 Uen R3A

RBS 2207

Radio Configurations

Description

This document describes the radio configurations for RBS 2207.

TX1

dTRU

TX1

CDU-J

RX2

RX1

TX2

P012209A

TX2

RX3

RX4

RX2

RX1

TX/

RXA

DPX LNA DPX

TMA

(optional)

TX/

RXA

DPX LNA DPX

TMA

(optional)

RXB

DPX

CELL 1

CELL 2

CELL 1

CELL 2

LNA

TX1

RX2

RX1

TX2

DPX LNA DPX

TMA

(optional)

DPX LNA DPX

TMA

(optional)

DPX

LNA

1 = Antenna Reference Point without TMA

2 = Antenna Reference Point with TMA

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RBS 2207Radio Configurations

Contents

1 Introduction 3

1.1 Mobile Telephone System 3

1.2 Radio Base Station 4

2 References 4

3 Definitions 4

3.1 Cabinet Types 6

4 Frequency Bands 6

5 Basic Configurations 6

5.1 dTRU Topology 7

5.2 CDU-J Configurations 9

6 Site Cell Configurations (SCC) 12

6.1 Single Band Configurations 12

6.2 Dual Band Configuration 13

6.3 Mixing CDU-G and CDU-J 14

6.4 RX Cables 14

6.5 SW Power Boost Configurations with CDU-J 14

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RBS 2207 Radio Configurations

1 Introduction

The radio configurations described are valid for RBS 2207, equipped with a

maximum of three dTRUs/six TRXs per cabinet. The descriptions include basic

configurations and site cell configurations.

1.1 Mobile Telephone System

P007534B

PSTN SS

OSS

BSS

BSC

BTS

RBS 2000

SS Switching System

OSS Operation Support System

BSS Base Station System

BSC Base Station Controller

RBS Radio Base Station

BTS Base Transceiver Station

PSTN Public Switched Telephone Network

Figure 1 RBS 2000 in the Ericsson GSM system

The Base Station System (BSS) contains two functional entities; the Base

Station Controller (BSC) and the Base Transceiver Station (BTS).

The BSC handles radio-related functions such as handover, management of

the radio network resources, and cell configuration data. It also controls radio

frequency power levels in RBSs and MSs.

The BTS is a network component which serves one cell, and is controlled by

the BSC. The BTS consists of the radio transceivers and all the digital signal

processing equipment. RBS 2000 contains equipment for one to three BTSs.

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RBS 2207Radio Configurations

Figure 2 An example of an RBS 2000 servicing a three-cell site

1.2 Radio Base Station

The Radio Base Station 2000 (RBS 2000) is Ericsson’s second generation of

RBSs, developed to meet the GSM specifications for BTSs.

2 References

3GPP TS 45:005 Digital cellular telecommunications system (Phase 2+);

Radio transmission and reception (3GPP TS 45:005

Release 4).

3GPP TS 45:008 Digital cellular telecommunications system (Phase

2+); Radio subsystem link control (3GPP TS 45:008

Release 4).

3 Definitions

Tower Mounted Amplifier (TMA)

The TMA compensates for signal loss in the receiver antenna cables, reduces

system noise and improves uplink sensitivity. The TMA can consist of a duplex

filter. Duplex is the function that allows communication in two directions

(sending and receiving) on one channel.

The TMAs used are Dual Duplex TMA (ddTMA).

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RBS 2207 Radio Configurations

Antenna Reference Point

The antenna reference point is the point where the radio signal crosses the

RBS border, that is the connector for the antenna feeder. See the figure below.

Note: The TMA is inside the RBS border.

P007531A

RBS

TRX

Combining

system

filtering

TRX

X = Antenna reference point

Antenna

Figure 3 Antenna reference point

Antenna System

The antenna system comprises all RF transmission and reception antennas,

directed to cover the same area or multi-casting configurations.

Base Transceiver Station (BTS)

A BTS is a unit operating on a set of frequencies in one cell.

Basic Configuration

A basic configuration is a specified set of transceivers, CDUs and (in some

cases) TMAs, connected to one antenna system.

A basic configuration can be multiplied or used in combination with other basic

configurations, in order to build the necessary site equipment.

Radio Base Station (RBS)

An RBS constitutes all the equipment in an Ericsson base station, and may

comprise several BTSs.

Each RBS has one DXU, which consists of a maximum of six TRXs.

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RBS 2207Radio Configurations

Site Cell Configuration (SCC)

The SCC is a geographical concept describing how an area around one RBS

site is divided into radio traffic areas. The following types of site are defined:

Omni-site Radio coverage in one 360 degree sector, that is in

one area, using one BTS.

2-sector site Radio coverage in two sectors, that is two distinct

areas, using two BTSs.

3-sector site Radio coverage in three sectors, that is three distinct

areas, using three BTSs.

3.1 Cabinet Types

RBS 2207 Indoor cabinet with a maximum of three dTRUs/six TRXs

per cabinet

4 Frequency Bands

GSM 800 Uplink: 824 – 849 MHz

Downlink: 869 – 894 MHz

P-GSM 900 Uplink: 890 – 915 MHz

Downlink: 935 – 960 MHz

E-GSM 900 Uplink: 880 – 915 MHz

Downlink: 925 – 960 MHz

GSM 1800 Uplink: 1710 – 1785 MHz

Downlink: 1805 – 1880 MHz

GSM 1900 Uplink: 1850 – 1910 MHz

Downlink: 1930 – 1990 MHz

These frequency bands are supported by the configurations described in this

document.

5 Basic Configurations

The GSM 800, P-GSM 900, E-GSM 900, GSM 1800 and GSM 1900

configurations meet the GSM requirements, except where otherwise stated.

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RBS 2207 Radio Configurations

The radio performance of a configuration is defined at the TX and RX antenna

reference points at the RBS border. There is an X close to every reference

point in the following figures. The RBS border is not included in the figures.

The equivalent output power with SW power boost (TX diversity) configured

is the original output power specified for the basic configuration, increased by

typically 3 dB (if separate TX antennas are used). The configurations that

support SW power boost are listed in Section 6.5 on page 14.

Functional views of radio signal paths for various configurations are shown in

Figure 4 on page 8 up to and including Figure 7 on page 10. Only components

necessary to illustrate the configuration are shown.

5.1 dTRU Topology

Configuration of Hybrid Combiner

The dTRU can be configured with or without the hybrid combiner, using two

cables external to the dTRU, see Figure 4 on page 8.

Later versions of the dTRU do not use external hybrid cables, see Figure 5 on

page 8.

RX Signals Distributed from Two Ports

The RX signals can be distributed from the RX1 and RX2 ports to all four

receivers when both transceivers are connected to the same antenna system.

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RBS 2207Radio Configurations

TX1

P011000B

HC2

TX2 TX2

RX3

RX4

RX1

RX2

Hybrid

combiner

Hybrid

combiner

TX1

HC2

RX2

TX2

TX1+TX2

HC1

RX1

RX4

RX3

dTRU with no hybrid

combiner in use

dTRU with hybrid

combiner in use

TX1

TX1+TX2

HC1

TX1+TX2

HC1

RX3

RX4

RX1

RX2

Hybrid

combiner

dTRU with no hybrid

combiner in use,

shared between 2 cells

Figure 4 dTRU with and without Hybrid Combiner in Use

TX1

P012225A

TX2 TX2

RX3

RX4

RX1

RX2

Hybrid

combiner

Hybrid

combiner

TX1

RX2

TX2

TX1+TX2

RX1

RX4

RX3

dTRU with no hybrid

combiner in use

dTRU with hybrid

combiner in use

TX1

TX1+TX2

RX3

RX4

RX1

RX2

Hybrid

combiner

dTRU with no hybrid

combiner in use,

shared between 2 cells

Figure 5 dTRUs with Internal Switch for Hybrid Combining

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RBS 2207 Radio Configurations

5.2 CDU-J Configurations

This section shows different configurations using CDU-J. The same

configuration can exist using CDU-G but configured the same as CDU-J.

Configuration 2x1 CDU-J without hybrid combiner

TX1

dTRU

TX1

CDU-J

RX2

RX1

TX2

P012209A

TX2

RX3

RX4

RX2

RX1

TX/

RXA

DPX LNA DPX

TMA

(optional)

TX/

RXA

DPX LNA DPX

TMA

(optional)

RXB

DPX

CELL 1

CELL 2

CELL 1

CELL 2

LNA

TX1

RX2

RX1

TX2

DPX LNA DPX

TMA

(optional)

DPX LNA DPX

TMA

(optional)

DPX

LNA

1 = Antenna Reference Point without TMA

2 = Antenna Reference Point with TMA

Figure 6 2x1 CDU-J uncombined

Characteristics for one cell

Number of CDUs 2 (2 CDUs support

two sectors)

Frequency band GSM 800

P-GSM 900

E-GSM 900

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EN/LZT 720 0135 Uen R3A

RBS 2207Radio Configurations

Characteristics for one cell

GSM 1800

GSM 1900

Max. number of TRXs 1 (1 dTRU supports

two sectors)

Number of feeders 2

Number of antennas 2

Antenna configuration TX/RX + RX

TMA configuration (optional) ddTMA + ddTMA

Configuration 1x2 CDU-J with hybrid combiner

RX2

RX1

TX1 + TX2

dTRU

CDU-J

RX2

RX1

P012211A

TX/

RXA

DPX LNA DPX

TMA

(optional)

RXB

DPX LNA DPX

TMA

(optional)

DPX

LNA

1 = Antenna Reference Point without TMA

2 = Antenna Reference Point with TMA

Figure 7 1x2 CDU-J uncombined

Characteristics

Number of CDUs 1

Frequency band GSM 800

P-GSM 900

E-GSM 900

GSM 1800

GSM 1900

Max. number of TRXs 2

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