6.1 Nominal Error Rates (NER)

05.053GPPRadio transmission and receptionTS

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

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 or CS-4) shall have the following limits:

‑ static channel: BER £ 10‑4;

‑ EQ50 channel: BER £ 3 %;

except for 3GPP TS 400, where the following limits applies:

‑ static channel: BER  10‑4;

‑ EQ100 channel: BER  3 %.

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

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

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.

Furthermore, for static conditions, a bit error rate of 103 shall be maintained up to ‑15 dBm for GSM 400, GSM 900, GSM 850 MS and GSM 400, GSM 900, GSM 850, MXM 850 BTS, ‑23 dBm for DCS 1 800, PCS 1 900 MS and DCS 1 800, PCS 1 900, MXM 1900 BTS.

For static conditions, a bit error rate of 103 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, and GSM 850, ‑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.

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, GSM 850 and MXM 850, and ‑14 dBm for DCS 1 800, PCS 1 900 and MXM 1900.

6.1.2 8-PSK modulation

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: BER  10-4 for levels  -84 dBm;

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

This performance shall be maintained for normal BTS and MS, up to ‑40 dBm input level. The low level limit for other equipment shall be adjusted according to correction table 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.

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 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 and BTS 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 8-PSK, with equal input levels on non C0 carriers, up to 30 dB less than on the C0 carrier.

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; GSM 850 and MXM 850, 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 for reference sensitivity level in subclause 6.2. In addition, for GSM 850, MXM 850 and GSM 900 the limits shall be reduced by 5 dB.

In addition, when the frequency of the input 8-PSK modulated signal is randomly offset, on a burst-by-burst basis, by the maximum frequency error specified in 3GPP TS 05.10 [7] (for MS the pico-BTS frequency error in subclause 5.1 applies, and 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 and GSM 900 normal BTS: BER  10-4 for levels -84 dBm;

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

– GSM 400, GSM 850 and 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 [10]. 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 in subclause 6.2.