Places the mobile into a loop-back mode, where all the data transmitted on the downlink is sent back on the uplink. It is however possible for the test set to compute BLER in a similar way to a BER measurement.

This simplifies BER measurements, but it is not possible to do a simple packet ACK/NACK based BLER measurement.

In this mode, the downlink temporary block flow (TBF) is specified to operate in the unacknowledged Radio Link Control (RLC) mode. In an asymmetric configuration (for example, 2x1) it is possible to select which timeslot is looped back. Suitable for any type of receiver testing. Once in this mode the logical downlink is removed (although in the test set, the source remains active). The ETSI test modes A and B are defined in GSM 04.14:įorces the mobile into a transmit mode. In this case the difference in power levels can be up to 20 dB.įive of the connection types available in Active Cell operating mode are BLER, ETSI Type A, ETSI Type B (Unacknowledged), ETSI Type B (Acknowledged), and Switched Radio Block Loopback. The mobile has to be able to receive data in the presence of power in an adjacent timeslot not intended for the mobile. In this case, the standards specify that the mobile must be able to cope with a difference in power levels between the timeslots of up to 6 dB, without degradation of performance. The mobile has to receive data in an adjacent timeslot intended for it as well as the timeslot in question. The mobile is also required to receive data when there is power in adjacent timeslots with respect to the following two situations: GSM 450, GSM480, GSM750, GSM850 and PGSM class 4 or 5 (small) MS: +2 dBĭCS1800 class 3 and PCS1900 class 1 or 2 MS: +2 dB The input levels provided in the above table are referenced to a normal PGSM mobile (MS), and must be corrected by the following values for other MS: Reference level under static conditions (dBm) The BLER in each case must be less than or equal to 10%. The following table shows the reference sensitivity input levels for GPRS mobiles in the various bands under static conditions. The Release 99 GSM 5.05 standard defines the reference sensitivity of GPRS mobiles.

Standards Definition for Reference Sensitivity

Multislot power switch computer