BSC/ TRAUKey Components for Handling and Routing Information

The Base Station Controller (BSC)

and Transcoding Rate Adaption

Unit (TRAU) are key components

for handling and routing informa-

tion. Siemens offers operators a

flexible configuration, providing

solutions that are cost-effective

and make optimal use of re-

sources.

Thanks to their flexible and modulararchitecture, compact design (lessthan 360 liters due to the latest gen-eration of microprocessor technolo-gy), and low heat generation. BSCand TRAU do not require any specif-ic environmental conditions for oper-ation. Thus the operator now has theoption of placing either one or bothunits centrally - e.g., together withthe switching equipment - orremotely.

The BSC can be located close to thebase stations. It concentrates thetraffic towards the MSC, optimizingthe utilization of the associatedleased lines. In addition, the BSCsupports various BSC-BTS configu-rations (e.g., star, multidrop andloop) and star configurationstowards the TRAU.

The TRAU is a stand-alone unit andcan be located close to a MobileSwitching Center (MSC), thus opti-mally utilizing 16kbit/s channel sub-multiplexing and saving line costs.

Product Profile

■ A compact solution with only 360liter volume

■ Dynamic capacity of 2,000 Erlangwith the option of upgrading tomore than 3,000 Erlang

■ No raised floors required■ No air conditioning required■ Modular BSC hardware expansion

of up to 4,320 ports■ Modular TRAU hardware expansion

of up to 480 traffic channels■ Maximum flexibility in network lay-

out for a cost-effective solutionfrom rural to high-density urbanenvironments – due to remote BSCinstallation

■ 16 or 64 kbit/s signaling channels(LAPD) between BSC and BTS (onlyone channel required per BTS site,minimizing least line costs)

■ Separate TRAU that can be locatedat the MSC site

■ Phase 2+ compatibility

Customer Benefits

■ High fault tolerance due to 2nredundancy in central parts and n+1redundancy in line interfaces

■ Sophisticated redundancy concept.Hardware faults have no impact onexisting calls

■ Easy system upgrade through soft-ware download

■ Handling of different software loadsat a time

■ Addition of line interfaces and BTSswithout traffic interruption

■ Various Abis interface configurations(star, multidrop, loop)

■ Various transmission media (e.g.,microwave, PCM30/PCM24, satel-lite)

■ One LMT for all entities■ Queuing and priority■ IMSI/Cell tracing■ Short Message Service (SMS)■ SMS cell broadcast■ Multiband operation■ Support of hierarchical cell structure

(up to 16 different priority levels)■ Support of VAD/DTX■ Full support of all existing and up-

coming GSM data services:HSCSD, GPRS, EDGE

■ ASCI■ Full-rate, half-rate, enhanced full-rate,

AMR■ A interface pools supported■ Other GSM services up to

phase 2+■ Tandem-free operation■ Prepared for location services

Feature Overview

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Unit#1 Fuse & Alarm

Unit#3 Fuse & Alarm

Unit#2 Fuse & Alarm

Unit#4 Fuse & Alarm

Fig.: BSC

Fig.: Front view of TRAU

Technical Data TRAUHeight x width x depth 2000 x 600 x 300 mmVolume net 360 lWeight 153 kgTemperature range (including solar radiation) – 5°C to + 45°CMax. power consumption 476 WInput voltage – 48VStorage acc. to ETSI 1.2Transportation acc. to ETSI 2.3Operation acc. to ETSI 3.1E

Technical Data BSCHeight x width x depth 2000x600x300mmVolume net 360 lWeight 128 kgTemperature range (including solar radiation) – 5°C to +45°CMax. power consumption 350 WInput voltage – 48 VStorage acc. to ETSI 1.2Transportation acc. to ETSI 2.3Operation acc.to ETSI 3.1EBack-to-back mounting possibleBack-to-wall mounting possible

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LinkInter-faces

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LinkInterfaces

Core modules(in duplicate)

SignalingPre-

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SignalingPre-

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Fig.: TRAU

Fig.: Front view of BSC

!Contact us!

Visit our website atwww.siemens.de/ic/networks/ca

Abbreviations

AMR Adaptive Multi-Rate CodingASCI Advanced Speech Call

ItemsBSC Base Station ControllerBTS Base Transceiver StationDTX Discontinuous TransmissionEDGE Enhanced Data rates for

GSM EvolutionETSI European

TelecommunicationStandards Institute

GPRS General Packet RadioService

GSM Global System for MobileCommunication

HSCSD High Speed CircuitSwitched Data

IMSI International MobileSubscriber Identity

LAPD Link Access Protocol forD-Channel

LMT Local MaintenanceTerminal

MSC Mobile Switching CenterOMC Operation and

Maintenance CenterPCM Pulse Code ModulationPSPDN Packet Switched Public

Data NetworkPWRS Power SupplySGSN Serving GPRS Support

NodeSMS Short Message ServiceTRAU Transcoding and Rate

Adaption UnitVAD Voice Activity Detection

COPYRIGHT© • Siemens AG 1999 • Information and Communication Networks • Communication on Air • Hofmannstr. 51 • 81359 Munich • Germany •

Order No. A50001-N3-P31-2-7600 • Printed in the Federal Republic of Germany • MR M546 SIE_476_99 PA 09995.

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Interfaces

Abis interface Submultiplexing 16 kbit/s-star, multidrop,loop 16/64 kbit/s LAPD

Asub interface Submultiplexing 16 kbit/sA interface According to GSM 08.OMC interface X.25 connection via PSPDN or MSCLMT interface X.21/V.11 (64 kbit/s)Gb interface Frame relay connection towards SGSN