ASCOM SRU User manual

PRODUCT SHEET
Product: TEMS™ Automatic – Scanning Receiver Unit
SRU – SCANNING RECEIVER UNIT FOR
TEMS™ AUTOMATIC
SRUs (Scanning Receiver Units) are light-
weight and versatile devices dedicated to GSM
and WCDMA scanning. One or two SRUs can be
connected to TEMS Automatic RTUs (Remote Test
Units) performing autonomous data collection.
Each SRU is a standalone device that can be conveniently moved
between RTUs as dictated by testing requirements.
This creates a flexible and highly cost-efficient scanning solution,
allowing operators and service providers to enhance network performance
during deployment as well as during optimization and troubleshooting.
The SRU is built on the same hardware as commercial Sony Ericsson
mobile phones. This means that the SRU delivers precisely the same signal
strength readings as the commercial phones, using identical circuitry. More
generally, being equipped with identical hardware, the SRU has no need to
simulate any part of the phone’s scanning procedure in software.
Furthermore, since it is devoted to the task of scanning, the SRU vastly
outperforms commercial phones in terms of scanning speed and update rate.
(Phones do not scan any more than what is required to maintain good radio
performance.) The SRU is fully on a par performance-wise with scanners
based on dedicated hardware.
In GSM networks, the SRU undertakes RSSI scanning of selected channels
or entire GSM bands. BSIC decoding can optionally be done whenever possible.
For WCDMA, the SRU performs CPICH scanning on up to 12 carriers at
a time. A snapshot of System Information Message can be taken once for
each cell camped on. Furthermore, a special “BCH scanning” mode is available
for continuous monitoring of System Information. The latter is useful for
example when conducting a close-up investigation of parameter settings.
The SRU contains an Ericsson F3607gw Mobile Broadband Module
supporting frequency bands as follows:
n GSM 850/900/1800/1900 MHz
n WCDMA 900/1900/2100 MHz (Europe) or 850/1900/2100 MHz (US)

Scanning capabilities Scanning Receiver Unit (SRU) F3607gw
Technology GSM and WCDMA
WCDMA bands 850/1900/2100 (US) or 900/1900/2100 (EU) MHz
GSM bands 850/900/1800/1900 MHz
WCDMA scanning Top-N CPICH scanning, BCH scanning
GSM scanning GSM carrier (RSSI) scan, BSIC decoding
Size 126 x 80 x 30 mm
Weight 272 gr
Ascom Network Testing Inc.
1943 Isaac Newton Square
Reston | VA | 20190-5006 | USA
www.ascom.com/networktesting 03.2010 © Ascom 2010. All rights reserved. TEMS is a trademark of Ascom. All other trademarks are the property of their respective holders. | 3/287 01-FAP 901 0972 Rev A Uen | Photo: Fotograf Paulina
PRODUCT SHEET: SRU  SCANNING RECEIVER UNIT
Top-N CPICH Scanning BCH Scanning
Number of cells Up to 40 cells per UARFCN Up to 40 cells per UARFCN
Number of UARFCNs Up to 12 UARFCNs Up to 12 UARFCNs
Measurements taken RSCP (Total and Path), Ec/No, RSSI RSCP (Total and Path), Ec/No, RSSI, UL interference,
intra-frequency cells, inter-frequency cells, inter-RAT
(i.e. neighbor lists of scanned cell)
System Information
messages decoded
MIB, SIB1 … SIB7, SIB11, SIB11bis, SIB12, SIB18,
SB1, SB2
MIB, SIB1 … SIB7, SIB11, SIB11bis, SIB12, SIB18,
SB1, SB2
Acquisition time 20 ms (typical; i.e. about 50 cells are measured
each second)
Single System Information Message: 50–200 ms (random
wait until a message arrives). One cell with 6 System
Information Messages being broadcast: Approx. 300 ms
Ec/No cell limit –30 ... 0 dB (configurable) –20 dB (fixed)
Measurement resolution 0.01 dB
Measurement accuracy ±1.0 dB (typical)
Measurement range –116 … –15 dBm
False detection rate Ec/No cell limit (dB) False detection rate (%)
< –28 > 17
–27 2.5
–26 0.026
–25 0.011
> –24 < 0.0065
CPICH detection thresholds Relative: Ec/No = –30 dB, Absolute: Ec = –116 dB
Max. number of Rake fingers 12
WCDMA SCANNING: TECHNICAL DATA AND PERFORMANCE
Top-N CPICH Scanning BCH Scanning
Scanning capacity Individual carriers: Up to 200. Carrier ranges: Up to 4, each of which may extend to an entire GSM band.
It is thus possible to scan all carriers on four GSM bands simultaneously.
Measurement range –117 dBm … –38 dBm
Measurement resolution 1.0 dB
Measurement accuracy ±2.0 dB (typical)
Resolution bandwidth 200 kHz
Scanning speed
(ARFCNs/sec)
Whole bands, no BSIC decoding 1600
Individually selected carriers, no BSIC decoding Min. 50, max. 300
With BSIC decoding 40
GSM SCANNING: TECHNICAL DATA AND PERFORMANCE
Scanning sensitivity to speed: The scanning performance mentioned in this information sheet is maintained without degradation at speeds up to at least 250 km/h.