09 | Keysight | E1968A GSM/GPRS/EGPRS Test Application - Technical Overview

Receiver measurement specifications

Simultaneous demodulation and measurements

The test set’s RF analyzer provides dedicated signal paths for

demodulation (maintaining the link) and measurements to be

performed simultaneously.

Demodulation frequency

capture range

Signal must be within ± 100 kHz of test set’s

expected frequency for warranted performance

Single-slot demodula-

tion sensitivity

≥ –30 dBm for BER and BLER measurements

Multislot demodulation

sensitivity

All uplink timeslots ≥ –30 dBm for maintaining a

data link when

– Adjacent GMSK timeslots from GPRS

signals are ≤ 25 dB different in level

– Adjacent GMSK timeslots from EGPRS

signals are ≤ 20 dB different in level, or

– Adjacent 8PSK timeslots are ≤ 10 dB

different in level

Supplemental characteristics

Typical demodulation

sensitivity

≥ –40 dBm for maintaining a link

GSM BER measurement

Types of signals

measured

Compares 260 bits of speech data using mobile

phone loopback with or without signaling of

erased speech frames

Minimum input level

Uplink signals at test set’s RF IN/OUT must

have transmit power ≥ –30 dBm for warranted

performance

Residual BER

Mobile loopback

In active cell operating modes as type A or type

B must be selected

Measurement type

Selected as residual type Ia, residual type Ib,

residual type II, type Ia, type Ib, or type II

Signaling loopback

control

Selectable as on or off

Data patterns

Selectable in GSM+TCH operating mode as all

zeros, all ones, alternate bits, alternate pairs,

alternate quads, PRBS-9, PRBS-15, fixed 2B

(hex), multi-tone, or custom

Closed-loop signaling

delay:

Settable between 0 and 5 s

Speech frames delay

Settable between 1 and 15 frames or automati-

cally determined

Measurement unit

Selectable as percent or count

Numerical results

BER, number of bits tested, number of bad

bits, frame erasure (FER) for residual measure-

ment types, cyclic redundancy check (CRC)

for non-residual measurement types, speech

frame delay, Rx level, Rx quality

Multi-measurement

capabilities

1 to 999,000 bits

Concurrency capabilities GSM BER measurements cannot be made con-

currently with GSM FBER measurements, GSM

decoded audio level measurements, or while

speech is provided on the downlink TCH; GSM

BER measurements can be made concurrently

with all other measurements

Supplemental characteristics

Measurement resolution 0.01 percent

GSM fast bit error ratio (FBER) measurement

Types of signals

measured

Comparison of 114 bits of interleaved data with

mobile phone in burst-by-burst loopback

Minimum input level

Uplink signal at test set’s RF IN/OUT must

have transmit power ≥ –30 dBm for warranted

performance

Residual BER

Measurement data

pattern

PRBS-9, PRBS-15

Mobile loopback

In active cell operating mode type C must be

selected

TDMA frame delay

Settable between 0 and 26 frames or

automatically determined

Signaling loopback

control

On or off

Closed-loop signaling

delay

Settable between 0 and 5 s

Measurement unit

Selectable as percent or count

Numerical results

Number of bits tested, FBER, number of bad

bits, TDMA frame delay, Rx level, Rx quality

Multi-measurement

capabilities

1 to 999,000 bits

Concurrency

capabilities

GSM FBER measurements cannot be made

concurrently with GSM BER measurement,

GSM decoded audio level measurements, or

while speech is provided on the downlink TCH;

GSM FBER measurements can be made con-

currently with all other measurements

Supplemental characteristics

Measurement resolution 0.01 percent