Ascom SRU Datasheet

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:

GSM 850/900/1800/1900 MHz

WCDMA 900/1900/2100 MHz (Europe) or 850/1900/2100 MHz (US)

PRODUCT SHEET: SRU  SCANNING RECEIVER UNIT

Scanning capabilitie s 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

WCDMA SCANNING: TECHNICAL DATA AND PERFORMANCE

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

Acquisition time 20 ms (typical; i.e. about 50 cells are measured

each second)

MIB, SIB1 … SIB7, SIB11, SIB11bis, SIB12, SIB18, SB1, SB2

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

GSM 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

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.

Ascom Network Testing Inc.

1943 Isaac Newton Square Reston | VA | 20190-5006 | USA www.ascom.com/networktesting