6.1 Nominal Error Rates (NER)

3GPP45.005GSM/EDGE Radio transmission and receptionTS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

This subclause describes the transmission requirements in terms of error rates in nominal conditions i.e. without interference. The relevant propagation conditions appear in annex C.

6.1.1 GMSK modulation

6.1.1.1 General performance requirements

Under the following propagation conditions and with an input level of 20 dB above the reference sensitivity level, the chip error rate, equivalent to the bit error rate of the non protected bits (e.g., TCH/FS class II, TCH/AHS class II or CS-4) shall have the following limits:

‑ static channel: BER £ 10‑4;

‑ EQ50 channel: BER £ 3 %;

except for GSM 400, where the following limits applies:

‑ static channel: BER  10‑4;

‑ EQ100 channel: BER  3 %;

and for GSM 700, where the following limits applies:

‑ static channel: BER  10‑4;

‑ EQ60 channel: BER  3 %.

6.1.1.2 Requirements for MS

The performance in 6.1.1.1 shall be maintained up to ‑40 dBm input level for static and multipath conditions.

In case of DLMC configuration, the performance shall be maintained up to -37 dBm of total input power, irrespective of the number of input signals.

This performance shall also be maintained by the MS under frequency hopping conditions, for input levels up to ‑40 dBm in timeslots on the C0 carrier, with equal input levels in timeslots on non C0 carriers up to 30 dB less than on the C0 carrier.

NOTE: This scenario may exist when BTS downlink power control and frequency hopping are used.

For static conditions, a bit error rate of 10^‑3 shall also be maintained by the MS under frequency hopping conditions, for input levels on the C0 carrier of up to ‑15 dBm for GSM 400, GSM 900, ER-GSM 900, GSM 850 and GSM 700, ‑23 dBm for DCS 1 800 and PCS 1 900, with equal input levels on non C0 carriers, up to 30 dB less than on the C0 carrier.

Furthermore, for static conditions, a bit error rate of 10^‑3 shall be maintained

– up to ‑15 dBm for GSM 400, GSM 900, ER-GSM 900, GSM 850, GSM 700 MS,

– up to ‑23 dBm for DCS 1 800 and PCS 1 900 MS.

6.1.1.3 Requirements for BTS

This performance shall be maintained up to ‑40 dBm input level for static and multipath conditions.

Furthermore, for static conditions, a bit error rate of 10^‑3 shall be maintained up to

– ‑15 dBm for GSM 400, GSM 900, ER-GSM 900, GSM 850, MXM 850 and GSM 700 BTS excluding multicarrier BTS equipped with multicarrier receiver,

– ‑18 dBm for GSM 400, GSM 700, GSM 850 and E-GSM 900 for multicarrier BTS equipped with multicarrier receiver,

– ‑23 dBm for DCS 1 800, PCS 1 900, MXM 1900 BTS including multicarrier BTS.

For the pico-BTS the nominal error rates need only be met in the static channel.

For pico-BTS, for static conditions, a bit error rate of 10^‑3 shall be maintained with input levels up to ‑5 dBm for GSM 900, ER-GSM 900, GSM 850 MXM 850 and GSM 700, and ‑14 dBm for DCS 1 800, PCS 1 900 and MXM 1900.

For a multicarrier BTS equipped with multicarrier receiver, the input level for bit error rate of 10^-3shall be adjusted by 0 dB, +4 dB or +9 dB for the Wide Area, Medium Range and Local Area classes, respectively.

6.1.2 QPSK/8-PSK modulation

6.1.2.1 Requirements for MS

For static propagation conditions, the chip error rate, equivalent to the bit error rate of the uncoded data bits shall have the following limits for input levels specified below:

– MS: BER  10^-4 for levels  -82 dBm.

This performance shall be maintained for MS, up to ‑40 dBm input level. The low level limit for other equipment shall be adjusted according to correction table 6.2-4 in subclause 6.2.

NOTE 1: Uncoded data bits refer to the encrypted bits of a burst, extracted by the receiver without any signal processing improvement from encoding/decoding of the signal.

In case of DLMC configuration, the performance shall be maintained up to -37 dBm of total input power, irrespective of the number of input signals.

NOTE 2: This scenario may exist when BTS downlink power control and frequency hopping are used.

Furthermore, a bit error rate of 10^-3 shall be maintained by MS for input levels up to -26 dBm.

For static conditions, a bit error rate of 10^-3 shall also be maintained by the MS under frequency hopping conditions, for input levels on the C0 carrier of up to -26 dBm at QPSK or 8-PSK, with equal input levels on non C0 carriers, up to 30 dB less than on the C0 carrier.

In addition, when the frequency of the input QPSK or 8-PSK modulated signal is randomly offset, on a burst-by-burst basis, by the maximum frequency error specified in 3GPP TS 45.010 (for MS the pico-BTS frequency error in subclause 5.1 applies), the performance shall fulfil the following limits for Static channel:

– for input levels specified below up to –40 dBm:

– GSM 400, GSM 700, GSM 850, GSM 900 and ER-GSM 900 MS: BER  10^-4 for levels -82 dBm;

– DCS 1800 and PCS 1900 MS: BER  10^-3 for levels –82 dBm.

For each burst, the sign of the frequency offset is chosen according to a 511-bit pseudo-random sequence, defined in ITU-T Recommendation O.153. This is also valid for consecutive timeslots in a multislot MS.

For other equipment the low signal level limit shall be adjusted according to correction table 6.2-4 in subclause 6.2.

6.1.2.2 Requirements for BTS

The RX performance requirements of BTS for modulation schemes using higher symbol rate apply to all specified pulse shaping filter used for the input signal.

For static propagation conditions, the chip error rate, equivalent to the bit error rate of the uncoded data bits shall have the following limits for input levels specified below:

– BTS including multicarrier BTS: BER  10^-4 for levels  -84 dBm;

This performance shall be maintained for normal BTS, up to ‑40 dBm input level. The low level limit for other equipment shall be adjusted according to correction table 6.2-4 in subclause 6.2.

NOTE 1: Uncoded data bits refer to the encrypted bits of a burst, extracted by the receiver without any signal processing improvement from encoding/decoding of the signal.

Furthermore, a bit error rate of 10^-3 shall be maintained by BTS for input levels up to -26 dBm.

For pico-BTS, for static conditions, a bit error rate of 10^-3 shall be maintained with input levels up to -16 dBm for GSM 900 and ER-GSM 900; GSM 850 MXM 850 and GSM 700, and -17 dBm for DCS 1800, PCS 1900 and MXM 1900.

For micro-BTS, the maximum input level shall be adjusted according to the correction table 6.2-4 for reference sensitivity level in subclause 6.2. In addition, for GSM 850, MXM 850, GSM 700, GSM 900 and ER-GSM 900 the limits shall be reduced by 5 dB.

For multicarrier BTS equipped with a multicarrier receiver, the input level for bit error rate of 10^-3shall be adjusted by 0 dB, +4 dB or +9 dB for the Wide Area, Medium Range and Local Area classes, respectively.

In addition, when the frequency of the input QPSK or 8-PSK modulated signal is randomly offset, on a burst-by-burst basis, by the maximum frequency error specified in 3GPP TS 45.010 (for BTS the MS frequency error in subclause 6.1 applies), the performance shall fulfil the following limits for Static channel:

– for input levels specified below up to –40 dBm:

– GSM 400, MXM 850, GSM 850, GSM 700, GSM 900 and ER-GSM 900 normal BTS: BER  10^-4 for levels -84 dBm;

– GSM 850 and GSM 900 multicarrier BTS: BER  10^-4 for levels -84 dBm;

– DCS 1800, PCS 1900 and MXM 1900 normal BTS: BER  10^-4 for levels -84 dBm;

– DCS 1800 and PCS 1900 multicarrier BTS: BER  10^-4 for levels -84 dBm;

For other equipment and multicarrier BTS equipped with multicarrier receiver, the low signal level limit shall be adjusted according to correction table 6.2-4 in subclause 6.2.

6.1.3 16-QAM/32-QAM modulation

6.1.3.1 Requirements for MS

For static propagation conditions, the chip error rate, equivalent to the bit error rate of the uncoded data bits shall have the following limits for input levels specified below:

Nornal symbol rate

– MS: BER  10^-4 for levels  -80 dBm.

Higher symbol rate

– MS: BER  10^-4 for levels  -77 dBm.

This performance shall be maintained for MS, up to ‑40 dBm input level. The low level limit for other equipment shall be adjusted according to correction table 6.2-4 in subclause 6.2.

NOTE 1: Uncoded data bits refer to the encrypted bits of a burst, extracted by the receiver without any signal processing improvement from encoding/decoding of the signal.

In case of DLMC configuration, the performance shall be maintained up to -37 dBm of total input power, irrespective of the number of input signals.

NOTE 2: This scenario may exist when BTS downlink power control and frequency hopping are used.

Furthermore, a bit error rate of 10^-3 shall be maintained by MS for input levels up to -29 dBm.

For static conditions, a bit error rate of 10^-3 shall also be maintained by the MS under frequency hopping conditions, for input levels on the C0 carrier of up to -29 dBm at 16-QAM or 32-QAM, with equal input levels on non C0 carriers, up to 30 dB less than on the C0 carrier.

For other equipment the low signal level limit shall be adjusted according to correction table 6.2-4 in subclause 6.2

6.1.3.2 Requirements for BTS

The RX performance requirements of BTS for modulation schemes using higher symbol rate apply to all specified, pulse shaping filter used for the input signal.

For static propagation conditions, the chip error rate, equivalent to the bit error rate of the uncoded data bits shall have the following limits for input levels specified below:

Normal symbol rate

– BTS including multicarrier BTS: BER  10^-4 for levels  -84 dBm;

Higher symbol rate

– BTS including multicarrier BTS: BER  10^-4 for levels  -78 dBm;

This performance shall be maintained up to ‑40 dBm input level. The low level limit for other equipment and multicarrier BTS equipped with multicarrier receiver shall be adjusted according to correction table 6.2-4 in subclause 6.2.

NOTE: Uncoded data bits refer to the encrypted bits of a burst, extracted by the receiver without any signal processing improvement from encoding/decoding of the signal.

Furthermore, a bit error rate of 10^-3 shall be maintained by BTS for input levels up to -29 dBm.

For pico-BTS, for static conditions, a bit error rate of 10^-3 shall be maintained with input levels up to -19 dBm for GSM 900; GSM 850 MXM 850 and GSM 700, and -20 dBm for DCS 1800, PCS 1900 and MXM 1900.