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
CDU-J
RX2
RX1
TX2
P012209A
TX2
RX3
RX4
RX2
RX1
TX/
RXA
DPX LNA DPX
TMA
(optional)
X
X
12
TX/
RXA
DPX LNA DPX
TMA
(optional)
XX
12
RXB
RXB
DPX
DPX
CELL 1
CELL 2
CELL 1
CELL 2
LNA
LNA
TX1
RX2
RX1
TX2
DPX LNA DPX
TMA
(optional)
X
X
12
DPX LNA DPX
TMA
(optional)
X
X
12
DPX
DPX
LNA
LNA
1 = Antenna Reference Point without TMA
2 = Antenna Reference Point with TMA
E
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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.
X
P007531A
RBS
TRX
Combining
system
+
filtering
TRX
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
TX
TX
P011000B
HC2
TX2 TX2
RX
RX
RX
RX
RX3
RX4
TX
RX1
RX
RX
RX
RX
RX2
Hybrid
combiner
Hybrid
combiner
TX1
TX
TX
HC2
RX2
TX2
TX1+TX2
HC1
RX
RX
RX
RX
RX1
RX4
RX3
RX
RX
RX
RX
dTRU with no hybrid
combiner in use
dTRU with hybrid
combiner in use
TX1
TX
TX
HC
TX1+TX2
HC1
TX1+TX2
HC1
RX
RX
RX
RX
RX3
RX4
TX
TX
RX1
RX
RX
RX
RX
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
TX
TX
P012225A
TX2 TX2
RX
RX
RX
RX
RX3
RX4
TX
RX1
RX
RX
RX
RX
RX2
Hybrid
combiner
Hybrid
combiner
TX1
TX
TX
RX2
TX2
TX1+TX2
RX
RX
RX
RX
RX1
RX4
RX3
RX
RX
RX
RX
dTRU with no hybrid
combiner in use
dTRU with hybrid
combiner in use
TX1
TX
TX
TX1+TX2
TX1+TX2
RX
RX
RX
RX
RX3
RX4
TX
TX
RX1
RX
RX
RX
RX
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
CDU-J
RX2
RX1
TX2
P012209A
TX2
RX3
RX4
RX2
RX1
TX/
RXA
DPX LNA DPX
TMA
(optional)
X
X
12
TX/
RXA
DPX LNA DPX
TMA
(optional)
XX
12
RXB
RXB
DPX
DPX
CELL 1
CELL 2
CELL 1
CELL 2
LNA
LNA
TX1
RX2
RX1
TX2
DPX LNA DPX
TMA
(optional)
X
X
12
DPX LNA DPX
TMA
(optional)
X
X
12
DPX
DPX
LNA
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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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)
X
X
12
RXB
DPX LNA DPX
TMA
(optional)
XX
12
DPX
DPX
LNA
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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