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Information
Base Station System
Technical Description (TED:BSS)BS-240/241 II
A30808-X3247-K22-1-7618
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Technical Description (TED:BSS)BS-240/241 II
InformationBase Station System
!Important Notice on Product Safety
DANGER - RISK OF ELECTRICAL SHOCK OR DEATH - FOLLOW ALL INSTALLATION INSTRUCTIONS.
The system complies with the standard EN 60950 / IEC 60950. All equipment connected to the system must
comply with the applicable safety standards.
Hazardous voltages arepresent at the AC power supply lines in this electrical equipment. Some components may
also have high operating temperatures.
Failure to observe and follow all installation and safety instructions can result in serious personal injury
or property damage.
Therefore, only trained and qualified personnel may install and maintain the system.
The same text in German:
Wichtiger Hinweis zur ProduktsicherheitLEBENSGEFAHR - BEACHTEN SIE ALLE INSTALLATIONSHINWEISE.
Das System entspricht den Anforderungen der EN 60950 / IEC 60950. Alle an das System angeschlossenen
Gerte mssen die zutreffenden Sicherheitsbestimmungen erfllen.
In diesen Anlagen stehen die Netzversorgungsleitungen unter gefhrlicher Spannung. Einige Komponenten
knnen auch eine hohe Betriebstemperatur aufweisen.
Nichtbeachtung der Installations- und Sicherheitshinweise kann zu schweren Krperverletzungen oder
Sachschden fhren.
Deshalb darf nur geschultes und qualifiziertes Personal das System installieren und warten.
Caution:
This equipment has been tested and found to comply with EN 301489. Its class of conformity is defined in table
A30808-X3247-X910-*-7618, which is shipped with each product. This class also corresponds to the limits for aClass A digital device, pursuant to part 15 of the FCC Rules.These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment.This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accor-
dance with the relevant standards referenced in the manual Guide to Documentation, may cause harmful inter-ference to radio communications.For system installations it is strictly required to choose all installation sites according to national and local require-
ments concerning construction rules and static load capacities of buildings and roofs.Forall sites, in particular in residential areas it is mandatory to observe all respectively applicableelectromagneticfield / force (EMF) limits. Otherwise harmful personal interference is possible.
Trademarks:
All designations used in this document can be trademarks, the use of which by third parties for theirown purposes
could violate the rights of their owners.
Copyright (C) Siemens AG 2002.
Issued by the Information and Communication Mobile Group
Hofmannstrae 51
D-81359 Mnchen
Technical modifications possible.
Technical specifications and features are binding only insofar as
they are specifically and expressly agreed upon in a written contract.
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Technical Description (TED:BSS)BS-240/241 II
Reason for Update
Summary:
First edition for release BR 5.5 and BR6.0
Details:
Chapter/Section Reason for Update
Issue History
Issue
Number
Date of issue Reason for Update
1 11/2002 First edition for release BR 5.5 and BR6.0
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Technical Description (TED:BSS)BS-240/241 II
This document consists of a total of 78 pages. All pages are issue 1.
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.1 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.2 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2 Hardware architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1 Board redundancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.1.1 AC/DC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.1.2 Core . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.2 Nominal power amplifier output level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.2.1 Carrier Unit (CU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.2.2 Edge Carrier Unit (ECU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3 Rack configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192.4 Enhanced Observed Time Difference (E-OTD) . . . . . . . . . . . . . . . . . . . . . 24
2.4.1 Logical Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.4.2 LMU Interconnection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3 Modules Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.1 Core (COBA and COSA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.1.1 Core Basis (COBA2P8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.1.2 Core Satellite (COSA6P16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.2 Carrier Unit (CU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
3.3 Edge Carrier Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 383.3.2 Mechanics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.3 Transmitter Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.4 Receiver Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.5 Local Test Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.6 Supported frequency range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.7 Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.8 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3.3.9 Functional structure of the EDGE Carrier Unit. . . . . . . . . . . . . . . . . . . . . . 41
3.3.10 Main differences between ECU and CU . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3.3.11 EDGE Power Amplifier and Tranceiver Unit(EPATRX) . . . . . . . . . . . . . . . 42
3.3.12 Signal processing unit (ESIPRO). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433.3.13 EPSU (Power Supply Unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.4 Duplexer Amplifier Multi Coupler (DUAMCO) . . . . . . . . . . . . . . . . . . . . . . . 45
3.5 DI(=2) Amplifier Multi Coupler (DIAMCO) . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.6 Filter Combiner (FICOM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.7 Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.8 High Power Duplexer Unit (HPDU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.9 DC Panel (DCP). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.10 DC Link Equipment Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.11 Alarm Collection Terminal (ACT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.12 AC/DC converter (ACDC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.12.1 DC and Battery Controller (DCBCTRL) . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
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3.13 Overvoltage Protection and Tracer (OVPT). . . . . . . . . . . . . . . . . . . . . . . . . 50
3.14 Abis Link Equipment (LE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3.15 Cover parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.16 Backup Battery (BATTERY). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513.17 FAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.18 Heater Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
4 Antenna combiners and receiving paths . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1 Methods of combining. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1.1 Typical combiner losses (Tx path) and output power level . . . . . . . . . . . . . 62
4.1.2 Parameters of Tower Mounted Amplifier (TMA) . . . . . . . . . . . . . . . . . . . . . 63
4.1.3 Examples of possible BTSE configurations . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.2 Receiving paths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.2.1 Antenna diversity techniques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.2.1.1 Antenna System Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
4.2.2 Receiver sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3 Transmit Diversity/Antenna Hopping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
4.3.2 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
4.3.3 CU-Pools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
4.3.4 Algorithm for TX Diversity/Antenna Hopping. . . . . . . . . . . . . . . . . . . . . . . . 72
5 Power supply and battery backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
5.1 Support of emergency operation for 3rd party BBU system. . . . . . . . . . . . . 75
6 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
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Technical Description (TED:BSS)BS-240/241 II
Illustrations
Fig. 2.1 BS-240 II indoor Cabinet (Base Rack). . . . . . . . . . . . . . . . . . . . . . . . . . 14
Fig. 2.2 Units and modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Fig. 2.3 Redundant COREs and their interfaces. . . . . . . . . . . . . . . . . . . . . . . . . 17
Fig. 2.4 BS-240 base rack and 2 extension racks . . . . . . . . . . . . . . . . . . . . . . . 20
Fig. 2.5 BS-241 base rack and 2 extension racks . . . . . . . . . . . . . . . . . . . . . . . 21
Fig. 2.6 Possible configuration of Service1-Rack . . . . . . . . . . . . . . . . . . . . . . . . 22
Fig. 2.7 Possible configuration of Service2-Rack . . . . . . . . . . . . . . . . . . . . . . . . 23
Fig. 2.8 BS-240/241 II fully equipped with 24 carriers . . . . . . . . . . . . . . . . . . . . 24
Fig. 2.9 E-OTD Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Fig. 2.10 LCS Logical Reference Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Fig. 2.11 LMU Connection to BTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fig. 3.1 Backplane slot configuration of core. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Fig. 3.2 COBA2P8 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Fig. 3.3 Structure of ACLK function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Fig. 3.4 COSA6P16 block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Fig. 3.5 Carrier unit block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Fig. 3.6 PATRX block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Fig. 3.7 Principal data flow on SIPRO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Fig. 3.8 Position of the ECU and CU in the BTS. . . . . . . . . . . . . . . . . . . . . . . . . 39
Fig. 3.9 Epatrix and Esipro function block diagram.. . . . . . . . . . . . . . . . . . . . . . 41
Fig. 3.10 EPATRIX INTERFACES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Fig. 3.11 Data flow in ESIPRO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Fig. 3.12 Alarm collection terminal (ACTM and ACTP). . . . . . . . . . . . . . . . . . . . . 49
Fig. 3.13 Example of battery backup systems connected to the AC/DC . . . . . . . 51
Fig. 4.1 Overview of combining options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Fig. 4.2 DUAMCO 2:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Fig. 4.3 DUAMCO 4:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Fig. 4.4 DUAMCO 8:2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Fig. 4.5 FICOM 8:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Fig. 4.6 DIAMCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Fig. 4.7 HPDU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Fig. 4.8 Configuration with HPDU, DUBIAS and TMA. . . . . . . . . . . . . . . . . . . . 61
Fig. 4.9 Multi-cell (3,3,2): with 3 DUAMCO 4:2 . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Fig. 4.10 Multi-cell (3,3,2): with 2 DUAMCO 4:2 and 1 DUAMCO 2:2. . . . . . . . . 66
Fig. 4.11 Single-cell (8,0,0): with FICOM and DIAMCO. . . . . . . . . . . . . . . . . . . . 66
Fig. 4.12 Single-cell (8,0,0): with 2 DUAMCO 4:2. . . . . . . . . . . . . . . . . . . . . . . . . 67
Fig. 4.13 Multi-cell (2,2,2): with 3 DUAMCO 2:2. . . . . . . . . . . . . . . . . . . . . . . . . . 67
Fig. 4.14 Single-cell (11...16,0,0): FICOMs, DIAMCOs and HPDUs in 2 racks. . 68
Fig. 4.15 Initial Data Structure Necessary For Proposed Algorithm . . . . . . . . . . . 74
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Tables
Tab. 1.1 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Tab. 1.2 Frequency bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Tab. 2.1 Nominal Power Amplifier Output Level (CU). . . . . . . . . . . . . . . . . . . . . . 18
Tab. 2.2 Nominal Power Amplifier Output Level (ECU) . . . . . . . . . . . . . . . . . . . . 19
Tab. 3.1 Units and modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Tab. 3.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Tab. 4.1 Insertion loss of DUAMCOs, FICOMs, HPDU and TMA. . . . . . . . . . . . . 62
Tab. 4.2 S22 of the GSM and DCS/PCS FICOMs. . . . . . . . . . . . . . . . . . . . . . . . 62
Tab. 4.3 Parameters of 900 MHz Tower Mounted Amplifier . . . . . . . . . . . . . . . . . 63
Tab. 4.4 Parameters of 1800 MHz Tower Mounted Amplifier . . . . . . . . . . . . . . . . 64
Tab. 4.5 Parameters of 900/1800 MHz Tower Mounted Amplifier . . . . . . . . . . . . 65
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Technical Description (TED:BSS)BS-240/241 II
1 IntroductionThis manual is common for both BR5.5 and BR6.0 releases. Below are listed the
features not supported in BR5.5 line:
Enhanced Observed Time Difference features
Edge Carrier Unit
Transmit Diversity/Antenna Hopping
850 MHz frequency
The BS-240/241 II is an evolution of the existing BSS products. Some modifications
have been introduced in the mechanical which represents the latest state of technology.
The RF performance of the BTSs is not affected by the modifications.The architecture
of BS-240/241 II provides maximum flexibility to develop higher capacity BTSs with
reduced volume and an expanded number of 24 TRXs in 3 racks with a modularity of 8
TRXs per rack. The provision of a full spectrum of combining equipment allows high
power and minimized number of antennae. High receiver sensitivity is also guaranteed.
The BS-240/241 II primarily consists of:
carrier oriented boards called carrier unit (CU),
core boards (COSA/COBA) and
combining equipment
The carrier unit(s) provide all analog and digital signal processing including an RF power
stage necessary to process a single carrier (e.g., GSM 8 TCHs). The carrier unit(s) inter-
face with the combining equipment on the one side and with the core modules on the
other.The core boards provide functions common to all carriers within the BS-240/241 II
(e.g., clock generation, O&M processing,...) as well as LAPD processing for the different
carriers.
Up to 8 PCM lines can be connected to the core boards. In order to provide cost effectivesolutions for small and large BTSs, the core boards are scalable (COBA, /COSA). In
addition, the BS-240/241 II itself is scalable. It is possible to connect up to 2 extension
racks to a base rack.
The primary communication between the modules is provided by means of bi-directional
serial link communications between the carrier units (CU) and the core boards. The
serial link also provides an effective means to realize baseband frequency hopping.
Despite the fact that synchronization information is transported via the serial links, no
differential length constraints apply for the lines of the serial link.
All alarms, except the alarms generated in the core and in the CU boards, are trans-
ported via the CAN bus. Alarms of the CU boards are transmitted via CC-Link. Core
boards use their interface bus.
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1.1 Main features
The BS-240/241 II is designed for max. 24 carriers in 3 racks/shelters plus service
racks/shelters, if needed. The minimum configuration is one rack or one shelter with a
service shelter. Service racks/shelters can be configured to accommodate BackupBatteries and Link Equipment. A service rack/shelter can be equipped with AC/DC
Converters. Easy rack/shelter extension is possible with one or two Extension
Racks/Shelters.
The BS-240/241 II can be configured for the systems D850, D900, D1800 and D1900
with the following configurations:
Dual band: D900/D1800, D900/D1900, D850/D1800 and D850/D1900
GSM-DCS cell
mixed cell configuration to enlarge GSM cells with DCS frequencies
Common BCCH channel for GSM-DCS cell (dual band)
Single cell
Multi cell
Up to 6 cells per rack and up to 12 cells can be supported. A special case is the feature
concentric cell; one cell with 2 supply areas (inner and complete area). This feature
can be used in omnicells as well as in multicells with sectors.
The following combining options are supported:
antenna combining with duplexers (DUAMCO) can be applied for 2, 4 and 8 carriers.
RF amplifier and multicoupler for the RX path are integrated
antenna combining with Filter Combiners (FICOM) is possible for up to 8 carriers
onto one TX antenna
cascading of multicoupler equipment (DIAMCO) is possible for up to 24 carriers
High Power Duplexer (HPDU) for reduction of the necessary numbers of antennas
in case of FICOM per cell for up to 8 carriers can be applied every BTSE has core equipment in the Base Rack/Shelter
sensitivity is better than GSM requirements at the rack entry by using DUAMCO or
DIAMCO units
BTSplus sensitivity is better than GSM requirements at the antenna connector by
using Tower Mounted Amplifiers (TMA)
EDGE Carrier Units (ECU)
Mixed Configurations of Cells/Sectors applying both EDGE Carrier Units (ECU) and
normal Carrier Units (CU)
Traffic Channels:
Full-Rate (FR)
Half-Rate (HR) Enhanced Full-Rate (EFR)
Adaptive Multi Rate Codec (AMR)
Services:
GPRS
HSCSD
Frequency Hopping:
Baseband
Synthesizer
Redundancy:
SW Support of Core Redundancy
SW Support of BCCH Redundancy
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AC/DC n+1 redundancy. (n+1) AC/DC Converters work in load sharing, but n AC/DC
are able to supply the whole BS-240/241 II including Service Racks/Shelters
Abis interface:
Enhanced Full-Rate TCH Full-Rate and Half-Rate TCH
submultiplexing 4 x 16 kbit/s onto one 64 kbit/s timeslot for handling Full-Rate TCH
on Um interface
handling of 4x(2x8) kbit/s onto one 64 kbit/s timeslot for half-rate TCH on Um inter-
face
drop and Insert feature on 2 Mbit/s and 1.5 Mbit/s (T1) links is available on a 16 kbit/s
and a 64 kbit/s basis
star, loop and multidrop chain connections
cross connect function
change of PCM line configuration from star to multidrop or loop and vice versa is
possible without any interruption of service
multiple Abis LAPD links; load sharing and LAPD fault recovery
external clock synchronization
over-voltage protection with OVPT (optional feature)
Abis link media:
wire
fiber optic
Wave
Fault procedures:
Automatic Recovery procedure of faulty objects in BTS
Online RF Loopback
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1.2 Technical data
The BS-240/241 II family with 24 transceivers can be supplied in the following versions:
A BS-240 for indoor installation.
A BS-241 for outdoor installation (also equipped with: integrated power supply,battery, microwave equipment, integrated link equipment, heat exchanger and cross
connector).
BS-240/241 II consist in a split BTS architecture, with:
- 1 base rack
- 2 extension racks
- up to 5 service racks (service1 or service2).
Characteristics BS-240 (indoor) BS-241 (outdoor)
Max. TRX per BTSE 24 24
(in more than one rack)Max. TRX per cell 24 24
(in more than one rack)
Dimensions (mm) (HxWxD) 1600x600x450 (53x2x16) 1750x700x650 (59x24x22)
(Base Racks) (incl. Plinth)
Volume net 432 l 705 l796 l (incl. Plinth)
Maximum power consumption 1600 W 1750 W
Weight of Basic Rack / Shelter ca. 66 kg (146 Lbs) ca. 66 kg (146 Lbs)
Weight of Service1 Rack equipped with: - 1 Frame AC/DC incl. 6 AC/DC Modules (ca. 27 kg/60 Lbs)- 1 Frame for Battery incl. 1Battery (48V / 85 Ah) (ca. 140 kg/309Lbs)- 1 Mounting Kit for Link Equipment incl. 1 Frame NTPM, Frame forFan Unit and two FAN's (ca. 16 kg/ 35 Lbs)- 1 Rack (ca. 66 kg/146 Lbs)SUM: ca. 249 kg (549 Lbs)
Weight of Service1 Rack equipped with: - 1 Frame AC/DC incl. 6 AC/DC Modules (ca. 27 kg/60 Lbs)- 1 Mounting Kit for Link Equipment incl. 2 Frame NTPM, Frame forFan Unit and two FAN's (ca. 21 kg/46 Lbs)- 1 Rack (ca. 66 kg/146 Lbs)SUM: ca. 114 kg (251 Lbs)
Weight of sub-racks: Sub-rack with Battery ca. 140 kg (309 Lbs)Sub-rack AC/DC with 6 AC/DC Modules ca. 27 kg (60 Lbs)Sub-rack with 4 CU's and 2 MUCO's ca. 40 kg (88 Lbs)Sub-rack with 4 ACOM's ca. 40 kg (88 Lbs)Rack (empty) ca. 66 kg (146 Lbs)Shelter (empty) ca. 27 kg (60 Lbs)1 HEX ca. 5.6 kg (12 Lbs)
Temperature range (C) -5 C to +55 C+23 F to +131 F
-45 C to +50 C-49 F to +122 F
Tab. 1.1 Technical data
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Technical Description (TED:BSS)BS-240/241 II
Frequency-Band Uplink (MHz) Downlink (MHz)
GSM 850 824.2 - 848.8 869.2 - 893.8
P-GSM 900 890.2 - 914.8 935.2 - 959.8
E-GSM 900 880.2 - 914.8 925.2 - 959.8
R-GSM 900 876.2 - 914.8 921.2 - 959.8
GSM-RE 900 876.2 - 901.0 921.2 - 946.0
DCS 1800 1710.2 -1784.8 1805.2 -1879.8
PCS 1900 1850.2 -1909.8 1930.2 -1989.8
Tab. 1.2 Frequency bands
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2 Hardware architectureThe BS-240/241 II is designed to achieve commonality of boards to serve both
GSM850/GSM900 with its different deviates (DCS1800/PCS1900) and standards
selected for mobile communication systems. Moreover, the architecture of
BS-240/241 II provides maximum flexibility to develop large and small BTSs which have
similar costs per TRX. Fig. 2.1shows the base rack cabinet.
Fig. 2.1 BS-240 II indoor Cabinet (Base Rack)
The BTS functional blocks of the BS-240/241 II are shown in Fig. 2.2
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Technical Description (TED:BSS)BS-240/241 II
Fig. 2.2 Units and modules
CU 7
CU 0
CU 7
Base Rack
Service Rack
DUAMCO CU 0
COSA
ACTM
CAN BUS
CC-Links
FICOM
DIAMCO
HPDU
4xTX
RX
RXDIV
4xTX
RX
RXDIV
ACTC ACTP
LE 0 LE 1
BATTERY
TMA
DCB-
ACP
CTRL
ACTC
FAN
Cell 0
Cell 1
FICOM
DIAMCO
4xTX
4xTX
RX
RXDIV
Cell 1
RX
RXDIV
RX
RXDIV
ACTC ACTP
FAN
to next ext. rack
RXCA1RXCA0
BATTERY
DCB-CTRL
AC/DCAC/DC
DCP
DCP
DCP
Extension Rack
Cascading
DUBIAS
COBA
2 PCM
Ext. Sync.
2 PCM
4 PCM
Abis
Sync.
Abis
TMA
FAN
TMA
TMA
OVPT
OVPT
* not present in case of BTSE with reduced number of fan
*
*
*
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The architecture of BS-240/241 II provides maximum flexibility to develop large and
small BTSs which have similar costs per TRX.
The BS-240/241 II mainly consists of:
carrier oriented boards called carrier unit (CU), core boards (COSA/COBA) and
combining equipment
Up to 8 PCM lines can be connected to the core boards. In order to provide cost effective
solutions for small and for large BTSs, the core boards are scalable (COBA, /COSA). In
addition, also the BTS itself is scalable. It is possible to connect up to 2 extension racks
to a base rack.
The main communication between the modules is provided by means of bi-directional
serial link communications between the carrier units (CU) and the core boards. The
serial link also provides an effective means to realize baseband frequency hopping.
Despite the fact that synchronization information is also transported via the serial links,
no differential length constraints apply for the lines of the serial link.
All alarms, beside the alarms that are generated in the core and in the CU boards, are
transported via the CAN bus. Alarms of the CU boards are transmitted via CC-Link. Core
boards use their interface bus.
The carrier unit(s) provide all analog and digital signal processing including a RF power
stage necessary to process a single carrier (e.g., GSM 8 TCHs). The carrier unit(s) inter-
face with the combining equipment on the one side and with the core modules on the
other. The core boards provide functions common to all carriers within the BS-240/241 II
(e.g., clock generation, O&M processing,...) as well as LAPD processing for the different
carriers.
AC/DC AC/DC converter DCBCTRL DC and Battery Controller
ACP AC Panel DCP DC Panel
ACTC Alarm Collection Terminal Connection module DIAMCO DI(2) Amplifier Multi Coupler
ACTM Optional Alarm Collection Terminal for Master Rack DUAMCO Duplex Amplifier Multicoupler
ACTP Alarm Collection Terminal for Slave Rack FICOM Filter Combiner
CAN Controller Area Network HPDU High Power Duplexer
COBA Core Basis (COBA2P8) LE Link Equipment
COSA Core Satellite (COSA6P16) TMA Tower Mounted Amplifier
CU Carrier Unit
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Technical Description (TED:BSS)BS-240/241 II
2.1 Board redundancy
Redundancy in the SBS ensures survival of the system even in the event of multiple fail-
ures. Modular architecture, in conjunction with the concept of split functions, guarantees
maximum survivability with a minimum of additional hardware.
2.1.1 AC/DC
Up to 6 AC/DC converters (only one Frame) can be equipped in the service1 rack which
provide N+1 redundancy. AC/DC converters work in load sharing, but n AC/DC are able
to supply the whole BS-240/241 II .
.
2.1.2 Core
The Core can consist of up to 2 (without redundancy) or up to 4 (with redundancy)
boards, which have a common backplane. The block diagram depicts the 2n CORE
redundancy and the embedding of the active and the passive CORE into the BTS, and
the interrelation of both COREs.
Fig. 2.3 Redundant COREs and their interfaces
Both COREs (COBA0/COSA0 and COBA1/COSA1) have link interfaces to the ABIS
lines, but only one (the active CORE) can physically be connected.
On the backplane of the BTS, one connector provides a link of the LMT to the current
active CORE. In the case of a CORE switch over, the switch logic switches that
connector to the new active CORE. The same holds for the CAN bus (alarm bus), i.e.,
both COREs have the same CAN bus address where at any time at most one CORE is
an active CAN bus node.
Both the active and the passive CORE have links to the carrier units (CU); in reverse,
each CU is linked with both COREs. The traffic data are transmitted transparently
through the active CORE. Signal processing takes place only within the CUs.
CUSELIC
SELIC
BISON
RDInterf.
SwitchLogic
FALC
CORE 0CLK
Route Clock
Redundancy Link
Switch Logic Link
Route Clock
(Frame Sync)
ABISCAN
LMT
P
CUSELIC
CUSELIC
SELIC SELIC SELIC
BISON
RDInterf.
SwitchLogic
FALC
CORE 1CLK
Route Clock
P
SELICSELIC
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The endpoints of each link are built up by SELIC ASICs (note: one SELIC contains
double functionality), where on the CU, one SELIC serves two COREs. In the case of a
switch over, the SELICs on the active CORE are disabled by the switch logic and the
SELICs on the passive one are enabled. The SELICs on the CORE have to know
whether they are on the active or on the passive CORE. For this reason the SELICs
need a active/passive pin, which is served by the redundancy switch logic. When a
switch over occurs, the switch logic sets the active/passive pin of the former active
SELICs to "passive" and that of the former passive SELICs to "active".
The SELICs on the CUs have to recognize automatically which link comes from the
active CORE and which link from the passive one, i.e. it has to recognize a CORE switch
over by itself.
The RD interface (redundancy interface) is realized as a 2 Mbit/s HDLC link which
provides a communication interface between the two main processors (mP).
The switch logic is a flip-flop distributed over the two COREs. It manages the HW part
of a switch over and enables the COREs to know about their states as active/passive.
The ACLK of the active CORE is connected with the one on the passive CORE. It allows
the passive ACLK to be synchronized to the active one.
NOTE: the redundancy is implemented in a cold-standby mode, i.e., all calls will get lost
if a CORE switch over occurs.
2.2 Nominal power amplifier output level
2.2.1 Carrier Unit (CU)
D900 output powerat PA output
D1800 output powerat PA output
D1900 output powerat PA output
60 Watt 40 Watt 40 Watt
Tab. 2.1 Nominal Power Amplifier Output Level (CU)
iGSM: minimum guaranteed output power CU = 50 Watt tolerance value: 47.0 dBm -47.6 dBm (50 W - 57.5 W) DCS/PCS: minimum guaranteed output power CU = 34 Watttolerance value: 45.3 dBm - 46.0 dBm (34 W - 39.5 W).The mentioned data are guaranteed form Module Factory Test only. The typical outputpower at CU output is for:GSM: 47,3 dBm DCS: 45.7 dBmTo verify the typical output power values in field measurements, the tolerance value ofthe used measurement equipment, environmental conditions and GSM 05.05 specifica-tions have to be considered.
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Technical Description (TED:BSS)BS-240/241 II
2.2.2 Edge Carrier Unit (ECU)
2.3 Rack configurationThe BS-240/241 II family, with 8 transceivers per rack, which is expandable up to 24
transceivers in 3 racks and can be supplied in two versions:
a BS-240 for indoor installation, and
a BS-241 for outdoor installation (also equipped with integrated link equipment,
battery backup and a cooling system).
There are 4 different types of rack:
Base Rack/Shelter (with Core modules)
Extension Rack/Shelter (for more then 8 CUs)
Service1 Rack/Shelter (with AC/DC modules)
Service2 Rack/Shelter (for LE and batteries)
It is possible to connect up to 3 Racks/Shelters together (1 Base Rack, 2 Extension
Racks; the more possible racks/shelters called Service Rack/Shelter are not part of a
Rack Extension in the proprietary sense) that realizes then the performance of a 24 TRX
BTSE as shown in Fig. 2.4and Fig. 2.5:
D850/D900 output power
at PA output
D1800 output power
at PA output
D1900 output power
at PA output
70 Watt GMSK44 Watt 8PSK
54 Watt GMSK34 Watt 8PSK
54 Watt GMSK34 Watt 8PSK
Tab. 2.2 Nominal Power Amplifier Output Level (ECU)
iGSM: minimum guaranteed output power ECU = 63 Watt (GMSK) / 40 Watt (8PSK).DCS/PCS: minimum guaranteed output power ECU = 50 Watt (GMSK) / 32 Watt(8PSK).The mentioned data are guaranteed from Module Factory Test only.
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Fig. 2.4 BS-240 base rack and 2 extension racks
ACOM
0
ACOM
1
ACOM
2
ACOM
3
DC-PANEL
ACT-C
CU2
CU3
CU6
CU7
MUCO0
MUCO1
CU
0
CU
1
CU
4
CU
5
BS-240SIEMENS
ACOM
0
ACOM
1
ACOM
2
ACOM
3
CU2
CU3
CU6
CU7
MUCO0
MUCO1
CU
0
CU
1
CU
4
CU
5
BS-240SIEMENS
C
OBA
0
C
OSA
0
C
OBA
1
C
OSA
1
FAN 0 FAN 1
ACOM
0
ACOM
1
ACOM
2
ACOM
3
DC-PANEL
ACT-C
CU2
CU3
CU6
CU7
MUCO0
MUCO1
CU
0
CU
1
CU
4
CU
5
BS-240SIEMENS
FAN 0 FAN 1
DC-PANEL
ACT-C
FAN 0 FAN 1
FAN 2 FAN 3
FAN 4 * FAN 5*
FAN 2 FAN 3
FAN 4* FAN 5*
FAN 2 FAN 3
FAN 4* FAN 5*
* not present in case of BTSE with reduced number of fans
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Technical Description (TED:BSS)BS-240/241 II
Fig. 2.5 BS-241 base rack and 2 extension racks
Fig. 2.8 shows one of the possible configurations. The Base Rack and the Extension
Racks can be located physically in any position.
The Service Rack (see Fig. 2.6 and Fig. 2.7) satisfies various applications depending
on number of CU units configured and/or number and kind of Network termination equip-
ment provided and the Battery Backup time required.
CU2
CU3
CU6
CU7
MUCO0
MUCO1
CU
0
CU
1
CU
4
CU
5
BS-241SIEMENS
COBA
0
COSA
0
COBA
1
COSA
1
DC-PANEL
ACT-C
FAN 0 FAN 1
FAN 2 FAN 3
FAN 4* FAN 5*
ACOM
0
ACOM
1
ACOM
2
ACOM
3
CU2
CU3
CU6
CU7
MUCO0
MUCO1
CU
0
CU
1
CU
4
CU
5
BS-241SIEMENS
DC-PANELACT-C
FAN 0 FAN 1
FAN 2 FAN 3
FAN 4* FAN 5*
ACOM
0
ACOM
1
ACOM
2
ACOM
3
CU
2
CU
3
CU
6
CU
7
MUCO0
MUCO1
CU
0
CU
1
CU
4
CU
5
BS-241SIEMENS
DC-PANELACT-C
FAN 0 FAN 1
FAN 2 FAN 3
FAN 4* FAN 5*
ACOM
0
ACOM
1
ACOM
2
ACOM
3
* not present in case of BTSE with reduced number of fans
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InformationBase Station System
Fig. 2.6 Possible configuration of Service1-Rack
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Technical Description (TED:BSS)BS-240/241 II
Fig. 2.7 Possible configuration of Service2-Rack
On the digital side there is an extension of the CC links (connection between Core Back-
plane and the CUs not housed in the Base Rack) and the CAN Bus. The CAN Bus
connection cannot be shown in the right way because it strongly depends on the number
of Extension and Service Racks present.
On the RF side there is an extension in the RX path only for omni and specific sector
cell (e.g., 5/5/5) configurations and diversity reception with more than 8 TRX. Thus amaximum of 2 RF cables (cascading) are connected between two racks. There is no TX
combining over rack borders thus the TRXs of different racks is combined on air only.
Some configurations are not possible with 2 racks only e.g., 5/5/5 with FICOM because
of the number of available ACOM slots.
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Fig. 2.8 BS-240/241 II fully equipped with 24 carriers
For the BS-241 II outdoor cabinet only one type of the Shelter exists to be used for all
outdoor Base Shelter, Extension Shelters, Service1 and Service2 Shelters.
2.4 Enhanced Observed Time Difference (E-OTD)
In the GSM Location using an E-OTD Service, the LMUs (Location Measurement Unit)
are used to provide timing measurements of broadcast channel synchronization frames
(SCH). This is used within an E-OTD Service to provide location measurements for an
E-OTD equipped mobile station (MS).
In the E-OTD positioning method, the LMU measures the relative time of arrival of thesignals from several BTSs. The position of the MS is determined by deducing the
geometrical components of the time delays to an MS from the BTS. The Siemens LMU
measures real-time differences between synchronization bursts of BTS pairs. The accu-
racy of the location estimate depends on the MS being able to receive signals from a
sufficient number of BTSs whose timing is known.
An E-OTD location service works as follows:
The MS takes measurements of the time differences between the SCH of at least
three received BCCH. If it can see more than three BCCHs, it should take additional
measurements, as these will improve the accuracy of the result.
Extension Rack
Base Rack
Service1 Rack
Service2 Rack
Extension Rack
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communicate with the PLMN via a fixed, wired interface. Two potential interfaces are
provided, a CAN interface or a high speed serial interface.
The Siemens Type B LMU is a dual band unit operating over the GSM850 BCCH band
and the PCS1900 BCCH band.To improve measurement accuracy and allow for expendability, the LMU includes a
GPS receiver based on the SiRF chip set. Serial output of the GPS data can be enabled,
and a 1 PPS, TTL level signal is provided. The recommended GPS antenna for co-
located installation is the Trimble Bullet III. This has high immunity to jamming and
allows for both easier installation and less disruption of the GPS service.
For location services, the LMU sends and receives LLP messages compliant with the
ETSI standard, GSM 04.71.
2.4.1 Logical Architecture
The figure below shows the components of interest for the SMLC within the LCS logicalarchitecture. Siemens has adopted a BSS centric architecture for its LCS.
Fig. 2.10 LCS Logical Reference Architecture
LCS components of interest for the SMLC and their LCS-related functionalists:
BSC (Base Station Controller)
The BSC receives a location request for a particular MS from an LCS client via the
GMLC and MSC. It may append additional information and forward the request to a
BSS-based SMLC. It also transfers positioning related messages between the SMLC,
the target MS, and LMU. The BSC forwards the location response received from the
SMLC to the GMLC via the MSC.
BTS (Base Transceiver Station)
The BTS provides the radio interface to the MS.
GMLC (Gateway Mobile Location Center)
The GMLC provides external LCS clients with access to the GSM PLMN and its locationservice. There can be several GMLCs in one PLMN. The GMLC stores LCS subscription
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Technical Description (TED:BSS)BS-240/241 II
information on a per-LCS-client basis. It uses this information when receiving an LCS
request to identify the requesting LCS client and to authorize it to use the specified
request
LMU (Location Measurement Unit)
The LMU makes the radio measurements needed by different positioning methods and
supplies the data to the SMLC associated with it. The radio measurements can be
specific to one MS (location measurements) or specific to all MSs in a certain
geographic area (assistance measurements).
MSC/VLR (Mobile Switching Center/Visitor Location Registry)
With a BSS based SMLC, the MSC relays location requests and responses between the
GMLC and the BSC serving the MS to be located.
SMLC (Serving Mobile Location Center)The SMLC manages the overall coordination and scheduling of resources required to
position MSs in a PLMN. There may be more than one SMLC in one PLMN. The BSS-
based variant receives location requests from its associated BSCs. It determines the
positioning method to be used based on the QoS, the capabilities of the network, and
the MSs location capabilities. It can instigate location-related measurements in the MS
itself or in separate LMUs. The SMLC calculates the final location estimate and accu-
racy and returns it in a location response to the requesting BSC.
LCS Client
The LCS client provides location dependent services to the MS subscriber. It represents
a location application.
MS (Mobile Station)
The MS is the target to be located. For MS-assisted and MS-based positioning methods,
it generates additional measurement data or even calculates the location itself.
2.4.2 LMU Interconnection
The LMU module is controlled over the BTS CAN bus. The CAN bus will support LLP
messages, for the support of LCS, and O&M functions.
The LMU module is connected to external antennas and to the test signal ports of any
DUAMCOs, etc, that carry BCCH sniffer signals for the collocated BTS, as shown inFigure 2.10
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Fig. 2.11 LMU Connection to BTS
The LMU module is provisioned for the connection of two external GSM antennas. The
provisions for the use of a second antenna will cover those situations were a single
antenna would not acceptably receive all of the desired BCCH signals.
The LMU module is provisioned for the connection of an external GPS antenna.The LMU module is provisioned for the connection of three sniffer signals, one for each
sector. When multiple sniffer signals need to be combined then all of those serving a
particular sector will be combined into a single feeder cable using resistive combiners.
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Technical Description (TED:BSS)BS-240/241 II
3 Modules Description
iIn Tab. 3.1"x" indicates the frequency range: G =GSM, D =DCS, P = PCS
Name Freq.Var.
Remarks
Core modules:COBACOSA
Core basisCore satellite
no Up to 8 PCM lines with COBA and COSAequipped (COBA and COSA can beequipped only in the base rack/shelter).
Carrier related modules:CUxECUx
Carrier unit yes Carrier unit and edge carrier unit can beequipped only in the base and extensionracks/shelters (see also section 2.2)
Antenna system modules:DUAMCO2xDUAMCO4xDUAMCO8xDIAMCOxFICOMBxFICOMXxTMAxHPDUx
Duplexer 2:2Duplexer 4:2Duplexer 8:2Diversity multi couplerFilter combiner (base)Filter combiner (extension)Tower mounted amplifierHigh power duplexer
yes Antenna system modules can beequipped only in the base and extensionracks/shelters.DIAMCO, FICOM and HPDU are notavailable for the PCS band.DUAMCO 2:2, DUAMCO 4:2 and HPDUworking in shifted primary GSM band areavailable.A Diplexer can be used in all caseswhere GSM900 and DCS1800/PCS1900or GSM850 and DCS1800/PCS1900Feeder Cables have to be installed inparallel.
Alarm collection modules:ACTC (part of DC-Panel)ACTMACTP
Alarm collection terminals no ACTC is equipped in every rack/shelter.ACTM can be equipped only in the baserack/shelter. ACTP can be equipped inthe extension or service racks/shelters.
Power supply modules:ACDCDCBCTRL
ACDC converterDC battery controller
no ACDC controller used for AC power andsupervision of the ACDC converter canbe equipped only in the serviceracks/shelters.
OVPTOVPTCOAX
Over voltage protectionand tracer
no 100 / 120 symmetric line75 coaxial asymmetric line. The OVTPis an optional feature.
Abis Link Equipment:LE
Link Equipment no Link Equipment can be equipped only inservice1 and service2 racks/shelters
Tab. 3.1 Units and modules
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Fig. 3.1 Backplane slot configuration of core
For a configuration with less or equal 2 PCM30/24-interfaces and no Extension Rack
one COBA-board is required. The second slot can be used for an expansion of the BTSE
up to 8 Abis- and 24 CU-interfaces or it can be used for future expansions, e.g. a
GPS-Receiver for synchronization, better frequency-standards or other Abis-interfaces
than PCM30/24 (e.g., SDH, ATM).
The connection of the Abis- and CU-interfaces of the Core to the OVPT/Abis-interface
and the CUs is done via cables, which are plugged into the backplane.
The CU-interfaces of the Core and its redundancy are routed with separated wires via
the backplane and cables to the CUs (2 interfaces on one CU required).
The Abis-interface-ports of the Core and its redundancy-ports can only be switched to
the same wires. Only one transceiver at the same time is allowed to be switched to the
same wires (no simultaneous transmitting/receiving of Core and its redundancy on the
same Abis-port possible).
To find the physical place of a Abis-interface/CU out of the logical/memory-map
address, appropriate configuration-rules are created and considered!
Two Core-boards, COBA2P8 (see section 3.1.1) and COSA6P16 (see section 3.1.2),
are developed. The first digit gives the number of Abis-Interfaces, the following letter the
kind of Abis-interface (e.g. P for PCM30/24), and the following number the number of
CU-interfaces, e.g., COSA6P16 (6 PCM30/24 Abis-interfaces, 16 CU interfaces).
Hot Plug-in: A Hot Plug-in of the Core-boards (COBA and COSA) is possible. This
means that these boards can be plugged in/out with voltage switched on and no other
HW inside of the rack is disturbed (no loss of data on other boards) or a board is
destroyed.
CABLE
2 Abis 6 Abis
COBA COSA COBA red. COSA red.
2 Abis 6 Abis
Abis
8 CU 16 CU 8 CU 16 CU other
interfaces
Backplane Plugs
Extension
CUs
CUOVPT Rack
iA COBA-board can only be pulled out, if before the COSA-board is pulled out
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After plug-in of a Core-board, this board is in the reset-state and all bus-drivers of
external busses are in tristate. These drivers will be enabled not before initialization of
the devices, which serve the external busses (e.g., BISONs, SELICs).
3.1.1 Core Basis (COBA2P8)
The COBA is the central board of the core. The functionality of the advanced clock
generation (ACLK) and the base core controller (BCC) of the entire BTSE are inte-
grated. Additionally two PCM30/24 Abis-interfaces are available on the COBA2P8.
The controller maintains the SW of all BTSE units in FLASH-EPROMs, supervises the
SW download and terminates all internal system alarms. Beside the O&M functions, the
controller handles the signalling messages between the BSC (Abis) and CUs (CC-Link).
For interface and feature extensions the COBA can be expanded with one satellite
(COSA).
To fulfill the CORE redundancy aspects, the COBA board with its satellite COSA board
can be duplicated. In this case, one CORE (COBA+COSA) is "providing service" and
works as the master and the other CORE is "cold standby" or is "disabled" if HW prob-
lems have occurred. The redundancy switch is controlled by the COBA board. Special
links are provided for information exchange between the two board sets.
Fig. 3.2 COBA2P8 block diagram
The ACLK generates the system specific timing signals that are distributed by the
SELIC2s to the CUs. Fig. 3.3shows the structure of the ACLK function.
SMC2
SMC1
SMC4
SMC3
SMC2
TSA-SCC1SIU
BCC
MPC860MH
SESA
OASI
RDL
TPC
LMT/OTP
LAPD
ACLK
SELIC
SELIC
SELIC
SELIC
CUCU
CUCUCUCU
CU
CU
SELIC-BUS
Abis1
Abis2
BISON-BUS
SA
T-Interface
DC/DC Converter
SRAM16MB
FLASH3 X 8MB
CAN I/OBISON
RDLLOGIC WATCHDOGEEPROMsA/D-Conv. MUX
CAN-BUS, ALARMs LEDs, Redundancy Control,CU_DC_OFF ect.
Route clock
ext CLK sync
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Fig. 3.3 Structure of ACLK function
The tracking oscillator TOP synchronizes the oven controlled VCXO to the selected
frequency reference source. The TOP is realized as a phase/frequency locked loop. The
regulation parameters (P and I constant) are variable by SW. The regulating algorithm
is also implemented by SW. The output clock of the oscillator is called the master clock.The cut-off frequency of the TOP depends directly on the pulling gradient of the used
OCVCXO. Since the ACLK must synchronize to jittered lines, the scattering of the cut-off
frequency is very critical. The cut-off frequency must choose very low to eliminate lowest
frequency wander and is therefore near the range of the temperatures cut-off
frequency. To guarantee less deviation of the required cut-off frequency, also with
components from different manufactures (2nd and 3rd source), the OCVCXO is cali-
brated on the COBA in the factory. The pulling gradient is measured against an atomic
clock and the calibration values are stored on the COBA in a serial EEPROM. Uncali-
brated ACLKs must not work in the field. This can be achieved by the software, which
should check whether or not the ACLK is calibrated.
The clock line of the current select so synchronization source is also linked to the redun-dant ACLK function, which may also track this frequency. For redundancy switch-overs,
no warm up and only a short synchronization phase (because of the effects at the
switch-over) of the redundant ACLK is necessary.
The loadable timing generation hardware LTG is implemented in a FPGA device, which
can be loaded by the BCC with the current hardware function. In this stage, all neces-
sary system clocks and the master sync pulse are generated. Also, the master counter
is realized. The count value of the master counter is fed via a serial interface to the
SELIC. In active redundancy mode, the master sync pulse is forwarded to the standby
ACLK. In standby redundancy mode, the generator is synchronized with the master
sync pulse coming from the active ACLK function. Therefore, both redundant ACLKs
generate their clocks in alignment. If necessary, a very fast redundancy switch-over ispossible.
referenceclockdivider
masterclock
divider
phase/
frequency
detector
D
A
BCC interface
OCVCXO
32, 768 MHz
master clock
referenceclock input
TOPtrackingoscillatorprocessorcontrolled
master sync inputfrom redundant ACLK
LTG
loadabletiminggenerator
2
48
164096
1966080master counterBCC Interface
SYNC
16,384 MHz8,192 MHz
4,096 MHz2,048 MHz
8 kHz
60 ms
SYNC
Driver
Stage
systemclocks
master syncmaster counts
master sync to redundant ACLK
reference clock to redundant ACLK
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The FPGA is configured after a power-on reset from the BCC. Until the configuration has
finished, no output clocks are available, i.e., a communication via Abis or CUs is not
possible. The communication path from the LMT to the BCC is not affected, i.e., a
SW-download via the LMT is possible.
3.1.2 Core Satellite (COSA6P16)
The COSA6P16 board (COSA6P16) has the following functions:
6 PCM30/24-interfaces for Abis
16 CU-interfaces
The board is controlled from the COBA via the SAT-interface (satellite-interface; 32bit
data). Fig. 3.4shows a block diagram of the COSA6P16:
Fig. 3.4 COSA6P16 block diagram
The key-element of the PCM-interfaces is the FALC (Framing and Line InterfaceComponent for PCM30 and PCM24). It has the following tasks:
analogue receive and transmit circuitry for PCM30 and PCM24
data- and clock-recovery
frame alignment/synthesis
line-supervision
timing-adaptation to BISONs
Data arriving from the Abis-Interface via a PCM-port can be switched non-blocking and
bitwise (8 kbit/s and n x 8 kbit/s data-rate possible) with the BISONs to another
PCM-Port or via a SELIC2 to a CU.
SELIC
BISON
OVPT
FALC54 for PCM30/24&
PCMport5
PCMport6
Interfacesto COBA
Real-Time BUS (Hopping)Non-Real-Time BUS (O&M)
toCUs
BISONBUS
RouteClocks
RouteClock
Preselector
RCLK1-6
CLKX1-6
WorkingClocks
DC/DCConverter
SAT-Interface(32bit data)
SELIC
SELIC
SELIC
SELIC
SELIC
SELIC
SELIC
OVPT
FALC54 for PCM30/24&
PCMport1
PCMport2
OVPT
FALC54 for PCM30/24&
PCMport3
PCMport4
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The route-clocks of one FALC can be switched with the route-clock multiplexer to the
COBA for synchronization purposes. The COSA6P16 gets its working-clocks from the
COBA.
The COSA6P16 is switched with relays to the PCM-lines. In case of failures, thePCM-port 1(3)(5) and 2(4)(6) can be short-circuit with each other via appropriate relays.
There is a power-on device on the COSA6P16, which generates a reset at power-on
(board-reset). Via a line, the COSA6P16 can be reset from the COBA (board-reset).
Additionally, single devices on the COSA6P16 can be reset from the COBA via the
SAT-interface.
3.2 Carrier Unit (CU)
The Carrier Unit (CU) takes care for all carrier oriented tasks. In the uplink (UL) direction
two RF signals (diversity) are received and finally converted into TRAU frames and
signalling data. In the downlink (DL) direction, TRAU frames and signalling data arereceived and converted into a GMSK modulated RF signal, which is amplified to the
desired power level.
The CU consists of the following sub-units:
Power Amplifier and Transceiver Unit (PATRX)
Signal Processing Unit (SIPRO)
Power Supply Unit (PSU)
There are four variants of the CU for the frequency bands GSM850, R-GSM900,
DCS1800 and PCS1900. The differences of the variants arise mainly on the sub-unit
PATRX.
Fig. 3.5 Carrier unit block diagram
Power Amplifier and Transceiver Unit (PATRX)
PATRX provides the main analog functions of the CU:
receives the two (diversity) RF signals from the antenna combining equipment and
dawnconverts them to IF. The downconverted RF signals are then transmitted to
SIPRO where they are sampled and digitally downconverted to baseband.
receives the GMSK modulated signal from the SIPRO. The signal is then I/Q modu-
lated, upconverted, levelled, power amplified, and transmitted to the antenna
combining equipment.
supports the synthesizer frequency hopping provides an RF loop between downlink and uplink path for the unit test of the CU
SIPRO
PSU
PATRXCC-Link
-48V DC
Rx inputs
Tx output
Test PC/OMT, SCC,Layer 1 Trace, JTAG,PID, Vcce Loop
Display
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The power control loop implements 6 static power steps (each 2 dB) and an additional
15 dynamic power levels (each 2 dB). For low output power versions of the CU, a further
reduction of 2 dB is provided.
Fig. 3.6 PATRX block diagram
The functional sub-unit PATRX consists of three PCBs:
RXA:Analog receiver board with modules RXFEM, RXFED, RXLO and LTL
TXA:Analog transmitter board with modules MODUP, TXLO,and PWRDET
PWRSTG:Power stage including heat sink
Signal Processing Unit (SIPRO)
The SIPRO-Board is a part of the Carrier Unit. It contains all digital functions of the
carrier unit, including the following:
Signal Processing in uplink and downlink
Control of RF on PATRX
Baseband and synthesizer hopping
Channel Control
Radio Link Control
O&M parts relevant for carrier unit
Link to Core via CC linkAdditionally, following analog functions are located on SIPRO:
Analog to digital conversion (IF)
Digital to analog conversion (baseband)
Local clock of CU
Due to the analog functions, SIPRO is specific for the different frequency variants. There
are two types of SIPROs (one for GSM850/GSM900, and one for DCS1800/PCS1900).
Fig. 3.7illustrates the principal data flow on SIPRO:
receives two (diversity!) IF signals from the receiver, then analog to digital conver-
sion takes place. The next step is digital down conversion to the base band and
filtering. The output of the filter is equalized. The soft decisions from the equalizer
are then deciphered. Thedeciphered data stream is processed by thedecoder. After
to SIPRO for
LCLK from SIPRO
GMSK modulated
TXBB
Rx input
Tx output
RXFEM
RXFED
RXLO
TXLO
LTL
PWSTG MODUP
PWRDET
(diversity) downconversionto baseband
signal from SIPRO
RF Controlfrom SIPRO
from SIPRO
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decoding (including bad frame indication), the data stream is packed into TRAU
frames and sent to the TRAU. Signalling data (e.g., FACCH) are processed by layer
3 of BTS software
receives the TRAUframes or signalling data. The TRAU frames are unformatted and
sent to the coder. After encoding, data are ciphered. Now, baseband hopping takes
place. Training sequence is inserted in the data received via the hopping bus. These
bursts are sent to the GMSK modulator. This stream is converted into an analog
baseband signal leaving the SIPRO.
parallel to the data stream, the PLLs for synthesizer hopping are programmed.
Therefore, both for uplink and downlink, a data stream to the PLLs is generated.
Fig. 3.7 Principal data flow on SIPRO
Power Supply Unit (PSU)
The PSU is the DCDC converter for the CU for all applications. The PSU generates the
voltages +26/28V, +6V (only DCS/PCS), +12V, +5.3V and -5.3V for the analog circuitry
and +3.35V for the digital circuitry from a -48V primary input voltage. The PSU is
mechanically incorporated in the CU.
3.3 Edge Carrier Unit
The ECU unit is a modified CU using the same interfaces as CU but supporting EDGE
functionality in uplink and downlink. In downlink direction, the signalling and traffic data
are received from the core network and converted into GMSK or EDGE modulated
signal, which is amplified to the desired power level.
With the introduction of EDGE it is possible to mix EDGE and non EDGE timeslots on
the same carrier.
The ECU carries two independent receivers (normal and diversity channel) to provide
the antenna diversity function. In uplink direction, the received signal is converted to
IF-band. The IF-band is converted to a digital GMSK/8PSK-signal.
The 8PSK is a linear modulation, where three consecutive bits are mapped to symbol
as shown in table 3.2.
Uplink
Downlink
A
D
A
D
Hopping PLL
Hopping PLLControl
Central
diversity 2 2Digital Down-Conversion Equalization Deciphering Decoding
TRAU FrameFormatting
Signalling
TRAU FrameDeformatting
Signalling
CodingCipheringGMSK
Modulation
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With the 8PSK modulation, the payload/burst is three times more.
The mechanical design of ECU is identical to that of CU versions.
ECU and CU modules may be installed in any kind of mixed configurations concerning
BS-240/241 hardware (Base/Extension Cabinets). Further, any cell/sector configuration
with a mixture of EDGE CU and normal CUs can be implemented.
3.3.1 General
The EDGE Carrier Unit (ECU) takes care for all carrier oriented tasks of the BTS. In
uplink (UL) direction, two RF signals (diversity) are received and finally converted into
TRAU frames and signalling data. In downlink (DL) direction, TRAU frames and signal-
ling data are received and converted into a GMSK or EDGE modulated RF signal, which
is amplified to the desired power level.
An BTS rack can be equipped by any combination of ECU and CU (see fig 3.8)
Modulating bits Symbol
(1,1,1) 0
(0,1,1) 1
(0,1,0) 2
(0,0,0) 3
(0,0,1) 4
(1,0,1) 5
(1,0,0) 6
(1,1,0) 7
Tab. 3.2
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Fig. 3.8 Position of the ECU and CU in the BTS
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3.3.2 Mechanics
Mechanical design of the ECU 1800 is identical to that of CU versions for BTSplus. The
EPATRX , ESIPRO and PSU Blocks are integrated in one insert-card. In EPATRX Block
are situated the ERXA, ETXA and EPWRST groups.
3.3.3 Transmitter Function
In the downlink direction, the EPATRX receives from ESIPRO a GMSK-or 8PSK modu-
lated signal in baseband (I and Q modulated), which is upconverted to final transmit
frequency. Linearization of the transmitter is done by means of an adaptive predistor-
tion.
3.3.4 Receiver Function
The EPATRX carries two independent receivers (normal and diversity channel) to
provide the antenna diversity function. In uplink direction, the received signal is
converted via one frequency to IF-band. This IF-band signal is direct A/D converted to
a digital GMSK/8PSK-signal.
3.3.5 Local Test Loop
A local test loop allows a basic functional test of ECU (EPATRX and ESIPRO groups).
This test is initiated and controlled by ESIPRO group. In contrast to the CU, the LTL test
of the ECU includes the EPWRSTD.
3.3.6 Supported frequency range
PCS-band:
RX band:(1850 - 1910) MHz
TX band:(1930 - 1990) MHz
GSM-band:
RX band: (824 - 849) MHz
TX band: (869 - 894) MHz
3.3.7 Power Supply Unit
The ECU is supplied by -48 V DC and uses incorporated DC/DC converters.
3.3.8 Functional description
The ECU unit is a new developed and enhanced CU unit which supports the GMSK and
8PSK Modulation in uplink and downlink. It is a HW compatible to the CU unit and fits
into the BTSplus rack. A functional description of the whole receive and transmit path
including the EDGE Carrier Unit and the antenna combining equipment can be found in
[3.3.9].
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3.3.9 Functional structure of the EDGE Carrier Unit
The ECU (Figure 3.9) consists of following functional subunits:
Power Amplifier and Transceiver Unit (EPATRX)
Signal Processing Unit (ESIPRO)
EDGE Power Supply Unit (EPSU)
Fig. 3.9 Epatrix and Esipro function block diagram.
3.3.10 Main differences between ECU and CU
The design approach of this early ECU was to support the EDGE capability by mini-
mizing the changes to the CU HW. The following major changes to the CU HW weremade to support the EDGE functionality:
1. New Power Amplifier with better linearity and approximately 3 dB higher peak power
capability
2. New power levelling concept including a digital power control loop
3. New TX-VGA and PWRDET due to new power control
4. Adaptive predistortion to linearize the transmitter
5. New module Predistortion receiver (PDRX)
6. New IQDEM (IF-sampling ADC) with higher dynamic
7. RXA adaption to new IQDEM
8. New Power Supply Unit (EPSU) with higher power capability
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3.3.11 EDGE Power Amplifier and Tranceiver Unit(EPATRX)
EPATRX (figure 3.10) provides the main analog functions of the CU. In uplink direction,
two (diversity) preamplified and filtered RF signals are received from the antenna
combining equipment. These signals are down converted to IF and channel filtered inthe RXFE stage. The IF signals are then transmitted to ESIPRO, where they are
sampled and digitally down converted to baseband. In downlink direction, the GMSK or
8PSK modulated signal is received from the ESIPRO, I/Q modulated and up converted
by the MODUP stage, which also provides the levelling of the output power.
The obtained RF signal is then power amplified by the module EPWRST and transmitted
to the antenna combining equipment. A part of the transmitted power is fed to the
module PWRDET, which performs the power detection. This signal is used to close the
digital power loop.
The Predistortion Receiver (PDRX) down converts the transmit signal to the TX-IF for
the I/Q-Demodulation and adjusting the predistortion values. The transmitter is linear-
ized by means of an adaptive digital predistortion which is applied to the basebandsignals. For the introduction of the ECU (BR6.01), a static predistortion was choosen for
linearization of the transmit path. The HW is able to do adaptive predistortion, which can
be installed by SW update during BR 7.0. EPATRX is able to support synthesizer
frequency hopping by the implementation of the synthesizer modules RXLO and TXLO.
The unit test of the ECU is supported by the module LTL, which provides an RF loop
between downlink and uplink path.
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Fig. 3.10 EPATRIX INTERFACES
3.3.12 Signal processing unit (ESIPRO)
The ESIPRO-Board of the BTSPLUS is a part of the Carrier Unit. It contains all digital
functions of the Carrier Unit:
Signal Processing in uplink and downlink
Control of RF on EPATRX
Baseband and synthesizer frequency hopping
Channel Control
Radio Link Control
O&M parts relevant for carrier unit
Link to Core via ASIC SELIC
Digital Modulation
Predistortion signal processing
Digital part of Power control
Additonally, following analog functions are located on ESIPRO:
Analog to digital conversion (RXIF)
Digital to analog conversion (TX-baseband, TX-ramping)
Analog to digital conversion (PDRX)
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Analog to digital conversion of Diode voltage
Analog to digital conversion of temperature
Local clock of CU
To understand the functional structure of ESIPRO, knowledge of the principal data flow(see Figure 3.11) on ESIPRO is very useful.
In uplink direction, an IF-signal with a frequency of more than 100 MHz (GSM -
151.2MHz, DCS/PCS/GSM850 - 248.6MHz) arrives from ERXA at the ADC (Analog
Digital Converter). The ADC output is processed by a DDC (Digital Down Converter).
The DDC transforms the signal into baseband and filters the useful part of the signal.
The quasi analog signal at the output of the DDC is converted into bits with reliability
information (soft decisions) in the equalizer block. The soft decisions are deciphered
and decoded. Traffic channels (e.g., TCH/FS) are sent via TRAU/PCU frames to
TRAU/PCU. Signalling channels (e.g., SDCCH) are sent to the CORE of the BTS.In
downlink direction traffic channels arrive as TRAU/PCU frames from TRAU/PCU and
signaling data come from CORE. The data symbols are coded and ciphered. Afterwardsbase band hopping takes place via the CC link. ESIPRO sends the ciphered data to
another ECU and receives data to be transmitted. The received data are modulated as
GMSK or 8 PSK signals and given as a base band signal to ETXA.Both in uplink and
downlink direction PLLs have to be programmed once each burst to implement synthe-
sizer hopping.
Fig. 3.11 Data flow in ESIPRO
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3.3.13 EPSU (Power Supply Unit)
The EPSU is the DC/DC converter for the ECU for all applications. The EPSU generates
the voltages +26V/+28V, +12V, +5,3V and -5,3V for the analog circuitry and +3.3V for
the digital circuitry from a -48V primary input voltage. The only interface relevant changewas the change of the analog bias voltage for the EPWRSTD to +12V. The EPSU is
mechanically incorporated in the ECU.
The EPSU is a slightly modified version of the PSU of the GSM CU. In this document,
not all Interface names are changed to EPSU. Therefore, PSU can be seen as a
synchronym for EPSU in this document.
3.4 Duplexer Amplifier Multi Coupler (DUAMCO)
The DUAMCO consists of two identical modules. Every module contains a duplex filter,
which combines the RX and the TX path together, to be fed to a common antenna. The
DUAMCO combines 1 (see Fig. 4.2), up to 2 (see Fig. 4.3) or up to 4 (see Fig. 4.4)carriers to one antenna and consists of two branches constituted by:
a LNA (Low Noise Amplifier) which takes care of a low system noise figure
an attenuator (in case of installed TMAs, additional gains greather than the cable
losses must be adjusted by means of the attenuator)
a second low noise amplifier
a power splitter which distributes the received band to the CUs (Carrier Units)
a transmit path which consists of:
an isolator which protects the PAs (Power Amplifiers) inside the CUs from each
other in order to assure the required intermodulation suppression
a hybrid coupler which provides the reference signal for dynamic and static power
control. The corresponding not transmittedpower is terminated in a load including
a cooler (for DUAMCO 4:2 and DUAMCO 8:2)
an ASU (Antenna Supervision Unit) which is responsible for detecting certain
reflection factors at the antenna connector. The ASU detects the VSWR failure
and generates a failure information towards the O&M (CAN bus interface). This
information is subdivided in several levels with the following characteristics:
- VSWR < 2 neither generation of warning nor of an alarm
- 2 VSWR 3 generation of warning 'Antenna not Adjusted'
- VSWR > 3 generation of VSWR alarm 'Antenna Faulty'.
and a common part constituted by:
a PDU (Power Distribution Unit) for two TMAs (Tower mounted Amplifier) connected
to the TMAs by means of an antenna feeder cable
an O&M interface which transmits error messages to the BTS core via a slow O&M
bus (CAN bus)
The DUAMCO amplifier has two different operation modes:
the AMCO mode where no TMA is used
in case a TMA is used the DUAMCO is configured in the MUCO mode
The PDU provides the DC power supply and the alarm supervision of the TMAs. Alarm
monitoring is done with a signalling interface between DUAMCO and TMA, modulated
onto a IF carrier at 7.86 MHz.
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Technical Description (TED:BSS)BS-240/241 II
InformationBase Station System
3.5 DI(=2) Amplifier Multi Coupler (DIAMCO)
For the uplink direction, the DIAMCO is used to filter and distribute the received signals
to the Carrier Units in one rack. The DIAMCO consists of two branches constituted by:
a receive filter a low noise amplifier (LNA) which takes care of a low system noise figure
an attenuator
a second low noise amplifier
a power splitter which distributes the received band to the CUs (Carrier Units)
and a common part constituted by:
a PDU (Power Distribution Unit) for two TMAs (Tower mounted Amplifier) connected
to the TMAs by means of an antenna feeder cable
an O&M interface which transmits error messages to the BTS core via a slow O&M
bus (CAN bus)
The DIAMCO RX amplifier has two different operation modes:
the AMCO mode where no TMA is used
in case a TMA is used the DIAMCO is configured in the MUCO mode
3.6 Filter Combiner (FICOM)
With the FICOM, it is possible to combine up to 8 frequencies in downlink direction (TX)
in one rack. For the uplink direction (RX), the DIAMCO has to be used to filter and
distribute the received signals to the Carrier Units. The FICOM consists of remote
tunable narrowband filters (TNF). The advantage of this filter combining technique is the
very low insertion loss, if e.g., 8 transmitters are combined to one antenna.
In principle, the FICOM offers the following functions:
RF Functions: RF Power Combining
Transmitter Spurious Signal Suppression
Isolation between inputs
Isolation output to input
Control / Monitoring Functions:
Antenna VSWR alarm thresholds setting and status reporting
Internal Performance Monitoring
Interfacing with BTSE
LED Display:
Antenna VSWR alarms
Tuning alarms Presence of DC
Lightning Protection at the RF output connector (7/16)
3.7 Tower Mounted Amplifier (TMA)
The TMA connects the antenna with the BTSE in order to amplify the receive signal and
pass through the transmit signal. The TMA contains two duplex filters, each on one RF
connector, to separate and combine the receive and transmit path inside of the TMA.
The TMA consists of the following:
RX parts of the duplex filter and
LNA (Low Noise Amplifier) that takes care of a low system noise figure of the RX part
TX parts of the duplex filter
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Technical Description (TED:BSS)BS-240/241 II
The DC power for the TMA is feed into the triplexer by the PDU (Power Distribution Unit)
functionality of the DUAMCO/DIAMCO.
The Encoder/Decoder units of the TMA signalling interface generate an alarm for each
TMA separately by supervising the DC current consumption of each unit.Note: When the TMA is used the DUAMCO/DIAMCO works in the so called MUCO
(multi coupler) mode. In the MUCO mode, the DUAMCO/DIAMCO mainly works as multi
coupler to split the receive signal for the following CUs.
3.8 High Power Duplexer Unit (HPDU)
The High Power Duplexer has the task of combining the TX- and the RX-path into one
antenna, in order to minimize the number of antennas when FICOM is used. The HPDU
contains a duplex filter for the transmit frequency band and for the receive frequency
band, but no Low Noise.
Amplifier in the RX path.If the TMA shall be used together with a HPDU a so calledBIAS-T (DUBIAS) for powering and signalling of the TMA is required. Up to two HPDU
can be integrated on top of the rack below the cover and also up to two HPDU could be
fit in the gap between the inner side wall and the sub-rack in the shelter.
Note: HPDU is available working in the GSM-PS Primary Shifted band.
3.9 DC Panel (DCP)
The DC Panel contains the circuit breakers to protect the DC power lines for the
modules, the ACTP, FAN units, HEX, LE units. The LMT connector is integrated into the
front of DC panel located in the Base rack.
The DC Mains Supply Unit is located at the EMI-Panel of the BS-240/241 II Base rack,Extension rack, and Service 2 rack.
The DC Mains Supply Unit comprises the lightning protection (optional feature), the
EMI-filter, and the terminal clamps for external DC supply cable (-48V, 0V).
The lightning protection element indicates a fault condition at an alarm output (Lightning
Protection Alarm - LPA). The LPA signal is linked to the Alarm Collection Terminal.
3.10 DC Link Equipment Panel
The DC Link Equipment Panel provides the distribution of the 48 V supply voltage to
the modules within the BS-240/241 II Service 2 Racks and integrates the required DC
breakers for the different circuits.
If link equipment is installed into Service 1A and Service 2 cabinets then the associated
DC:LE-panel can be equipped with breakers. The LE breakers can be plug-in during
installation of link equipment at the BTSE site.
At the front of panel, the high-current clamp terminals are located for connecting the DC
supply lines (-48V, 0V).
The Alarm Collection Terminal module (ACT-C) is also integrated into the DC:LE-Panel
assigned to Service 2 cabinet. The ACT-C module is capable for collecting up to 8
cabinet alarms, and the alarms generated by fan units, battery temperature sensors,
lightning protection alarm (LPA / OVP), and rack door open sensor.
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Technical Description (TED:BSS)BS-240/241 II
InformationBase Station System
3.11 Alarm Collection Terminal (ACT)
The physical function of the ACT is to transfer the alarm and command signals from the
alarm command connectors of the BTSE subsystem via the CAN BUS to the Core
Controller.The ACT functionality is realised by a set of modules :
processor board - ACTP
interface board for external signals - ACTA
interface module for internal signals - ACTC
The interface of operator specify alarms (site inputs and site outputs) is allocated to the
Base rack. For this purpose, an ACT master module (ACTM) is installed into the Base
rack. The ACTM module consists of an ACTP board and an ACTA board.
The tasks of the ACTP are :
Interface to CAN BUS
Collection of alarms for units having no access to O&M bus or to the Core Controller;
Collection of so-called cabinet specific alarms (Door open, FAN0 to FANx, Smoke.. Temperature supervision via an external temperature sensor .
Rack address adjustment.
The special tasks of the ACTA are :
Collection of so-called operator available alarms (24 site inputs and 8 site outputs).
Indoor lightning protection
ACTC is installed once in each cabinet to collect all internal alarms. It has inputs for the
following alarm lines: rack door alarm, fan alarms, temperature alarms and internal
cabinet alarms, which can be defined by the operator. In the Base rack, the ACTC is
directly connected to the COBA.
For input of rack alarms, a 24-Pin WAGO terminal clamp is used on the ACTC-3. The
ACTC-3 board provides 4-pin connectors for DC output (-48 V) / alarm interface and2-pin connectors for alarm interface only.
Fan units
Smoke sensor
Location Measurement Unit (LMU)
Rack Door Open sensor
Temperature sensor
Lightning Protection Alarm (LPA, also called Over Voltage Protection - OVP)
Types of Alarm Collection Terminal Modules:
ACTMV2 Alarm Collection Terminal (ACT) Master
M:ACTPV3 ACT Processor Module
M:ACTC-3Vx ACT Collector Version
Different ACT, are available depending on the applications in the Base Rack/Shelter
(ACTM) or in the Service and Extension Rack/Shelter (ACTP) as shown in Fig. 3.12.
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Technical Description (TED:BSS)BS-240/241 II
Fig. 3.12 Alarm collection terminal (ACTM and ACTP)
3.12 AC/DC converter (ACDC)
Up to 6 AC/DC converters (only one Frame) can be equipped in the service1 rack which
provide N+1 redundancy. AC/DC converters work in load sharing, but n AC/DC are ableto supply the whole BS-240/241 II .
Each AC/DC rectifier has an integrated fan to force airflow through the module for
cooling purposes.
A local AC/DC supervision and management system has been implemented which is
accessible via RS232 interface and external PC.
The AC/DC system alarms are collected at the ACTC and through-wired to the ACTP