Network Scanner v2

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Transcript of Network Scanner v2

Technical Information

R&S Network Scanner

Network Scanner

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1.

Network Scanner

In mobile radio networks, it must be possible to obtain accurate information about the receiving conditions of a mobile unit at any place and any time. The radio network analyzer from Rohde & Schwarz provides outstanding performance independent of standards in a small unit. It meets the demands of network operators, regulatory authorities, railway carriers and infrastructure suppliers. The measurement data is collected and statistically evaluated by the R&S ROMES software from Rohde & Schwarz.

1.1

The necessariesMeasurement speed and accuracy are considerably higher than what mobile phones can deliver in order to represent the real physical nature Mobile phones can only see what the base station tells them to see o Hidden neighborhoods o Pilot pollution and interference causes are not detectable Limited channels/carriers (one carrier per mobile and SIM card) Layer 1 and layer 2 decoding for better troubleshooting Spectrum analysis provides detection of external interferences No SIM card identification is required o No costs o No capacity is allocated Failure of a mobile phone leads to data loss Measurements are independent of mobile chipsets and provide unbiased reference data Higher level and time accuracy compared to mobile phone-based measurements o Calibration is possible Use of only one unit for different networks and applications Cheaper compared to many dedicated units

1.2

Features

General data

Frequency range: 80 MHz to 3 GHz Bandwidth: 4 MHz Resolution bandwidth: 10 kHz FireWire IEEE 1394 interface GPS PPS high-precision synchronization Low-power consumption, typ. 8 W Wide-range power supply 9 V to 18 V DC Handy, portable and compact solution: 150 mm wide x 80 mm tall x 170 mm deep, and just 1.5 kg 2/16

Network Scanner

WCDMA/CDMA2000 PN scanner

All WCDMA bands (I to IX)/all CDMA frequencies BCH demodulation and decoding of all SIBs (WCDMA) 2500 dynamic rake receivers Sensitivity up to -122 dBm Dynamic range up to 29 dB

GSM network scanner

All GSM bands Sensitivity up to -112 dBm Interference analysis (C/I, type, source, location) Decoding of layer 3 system information types 1 to 4 (e.g. ARFCN, NCC, BCC, CI, LAC, MNC, MCC)

CW power

Frequency range from 80 MHz to 3 GHz Time or distance trigger (sampling rate: 1.6 ms in time triggered mode, 2 ms in distance triggered mode for single frequency mode) Measurement in accordance with Lee criterion Multitechnology & multiband Channel power (average, peak, RMS) Applicable for all GSM, WCDMA, CDMA, TETRA, WiMAX, broadcast and TV bands

WiMAX / LTE scanner

User-definable input frequency range from 30 MHz to 6 GHz Two independent RF and signal processing paths, each with a bandwidth of 20 MHz Integrated preselection for high intermodulation suppression while dynamic range is high Support WiMAX IEEE 802.16e measurements together with the R&SROMES drive test software (R&STSMW-K28) Support LTE measurement I/Q baseband measurement with Gigabit interface (R&STSMW-K1) Future-ready software-defined architecture Integrated GPS

1.3

BenefitsEasy, time-saving and high-precision coverage measurements and network optimization Outstanding measurement performance (For comparison: WCDMA mobile: approx. 1000 ms/measurement) o WCDMA: up to 3 ms/measurement (PN scan) o CDMA: up to 100 ms/measurement (PN scan) o GSM: up to 12.5 ms/channel (demodulation of sys. types) o CW: up to 1.6 ms/measurement (20 channels parallel)

Network Scanner

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One hardware platform for different technologies (GSM, CDMA2000, WCDMA, CW-Power 80 MHz 3 GHz, WiMAX, LTE), Frequency range: 80 MHz up to 3/6 GHz Easy means of competitive analysis without SIM card identification, e.g. for four or more network operators (benchmarking) in one drive o Twelve carriers for PN scanning simultaneously possible Indication of interference/pilot pollution problems Base station/Cell troubleshooting and maintenance Site finder for new base stations (test transmitter required) Ideal for high-speed measurements on railways, for example o All 19 GSM-R channels simultaneously at 180 km/h with 10 cm measurement distance Internal distance trigger (CW power) for uniform coverage measurements RF tracking as slave during CW power measurements Indoor measurements possible: backpack solution EMF measurement with the R&S TSMU-H

1.4

Test Mobile vs. Scanner Test Mobile Scanner++ ++ ++ ++ O O ++ ++ ++

Frequency limitation Band limitation Operator limitation Operating charges QoS End-to-end Coverage Accuracy Speed

O ++ ++ + -

1.5

The Solutions

1.5.1 Basic configuration

Rohde & Schwarz receiver (e.g. R&S TSMU) GPS Notebook R&S ROMES software

Network Scanner

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1.5.2 Indoor configuration

R&S TSMx / R&S TSM-DVB receiver Battery pack and charger 2 mobile phones GPS Notebook R&S ROMES software Backpack

1.5.3 Portable configuration

R&S TSMx receiver Up to 4 mobile phones GPS Notebook R&S ROMES software Robust suitcase

1.5.4 Vehicle-mounted configuration

Rohde & Schwarz receiver Uninterruptible power supply system with separate battery Up to 16 mobile phones GPS R&S ROMES software 19" rackmount 5/16

Network Scanner

2.2.1

ApplicationsTransmitter Scan

The GSM Network Scanner allows measurement and demodulation on multiple GSM bands in parallel. Selected channels or bands will be defined in the measurement configuration, together with the scanning speed

The NWS Transmitter Scan View shows the currently detected signals with: ARFCN Code Power of BCCH BSIC CI LAC MNC 6/16

Network Scanner

MCC T(MEAS) = Total Time since first reception of signal T (TDMA) = TDMA Frame Offset Frame Number FN

This view is continuously updated with the measurement data and can be configured in many ways for optimum display of the signals. 2.2

Benchmarking

The GSM NWS Top N View displays the properties of the signals from the base transceiver stations that are elements of the Top N Pools defined in the driver configuration menu. A Top N Pool contains up to N BSICs with specific characteristics providing the strongest synchronization channel P(SCH) level at a given position and time

2.3

2G/3G BCH Demodulation & BTS Position Estimation

Communication with seamless coverage and without interference, reliable data transmission at an acceptable speed these and many other quality criteria are decisive for the success of a mobile radio network on the market. To enable network operators to provide the required quality -- and thus be commercially successful. Rohde & Schwarz offers with its coverage systems professional solutions for all state of the art technologies. The Software ROMES controls the devices for the data acquisition and is used for data evaluation.

Network Scanner

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2.3.1 Features of 2G/3G BCH Demodulation and BTS Position Estimation Detailed analysis of System Information S1 S19 without a test mobile No SIM card is necessary for authorization to network Parallel measurement in appropriate and competitive networks Fast scan with up to 50 meas. / sec for a complete scan Usable for all GSM and UMTS bands Automatic BTS localization Creation and export of BTS list On-line control of measurement activities by ROMES Evaluation by Replay function of ROMES

2.3.2 Benefits 2.3.2.1 Benefits of 2G/3G Demodulator 2G/3G network analysis without using a test mobile Independent of test mobile with different net performance Reference system with high performance No SIM card needed Easy benchmark tests of net performance e.g. all bands WCDMA, CDMA, CDMA2000, GSM Only one Drive Test Scanner TSMQ for parallel measurements in all bands needed e.g. for 5 operators 5 test mobiles would be needed Small, compact test system for mobile applications Easy to operate time saving

2.3.2.1 Benefits of BTS Position Estimation Computes the geographical coordinates of GSM Transmitter stations by a special algorithm using BCH Demodulation data and timing information. Fast and easy creation of BTS list in unknown area Detection and localization of interfering Base Stations 8/16

Network Scanner

Just driving Automatic BTS list generation Marginal equipment costs (just Scanner and GPS is required)

Map display of all decoded and localized GSM transmitters

Map display of localized GSM transmitters from network operator A

Map display of localized GSM transmitters from network operator B Network Scanner 9/16

Map display of localized GSM transmitters from network operator C

2.4

Interference Analysis

Interference in Mobile Networks is most common and can only hardly be analyzed with regular network engineering measures. The continuous installation and reconfiguration of base stations always under time pressure is a major challenge for Frequency Planning. Very often does the missing synchronization between Network Planning and Network Operation lead to inconsistent data and parameter settings for the base stations. Other factors for interference are undue frequency or power settings, including ones own or those of neighboring countries. Close to borders, interference gains an even higher mportance. Interference in Mobile Networks is either Co-Channel, Adjacent Channel or Traffic Channel Interference, or external sources like spurious emissions or intermodulation. Function of the GSM Interference Analyzer: The defined ARFCN channe