5 Receiver characteristics

05.053GPPRadio transmission and receptionTS

In this clause, the requirements are given in terms of power levels at the antenna connector of the receiver. Equipment with integral antenna may be taken into account by converting these power level requirements into field strength requirements, assuming a 0 dBi gain antenna. This means that the tests on equipment on integral antenna will consider fields strengths (E) related to the power levels (P) specified, by the following formula (derived from the formula E = P + 20logF(MHz) + 77,2):

assuming F = 460 MHz : E (dBµV/m) = P (dBm) + 130,5 for GSM 400;

assuming F = 859 MHz : E (dBµV/m) = P (dBm) + 135,9 for GSM 850;

assuming F = 925 MHz : E (dBµV/m) = P (dBm) + 136,5 for GSM 900;

assuming F = 1 795 MHz : E (dBµV/m) = P (dBm) + 142,3 for DCS 1 800;

assuming F = 1 920 MHz : E (dBuV/m) = P (dBm) + 142,9 for PCS 1 900.

Static propagation conditions are assumed in all cases, for both wanted and unwanted signals. For subclauses 5.1 and 5.2, values given in dBm are indicative, and calculated assuming a 50 ohms impedance.

5.1 Blocking characteristics

The blocking characteristics of the receiver are specified separately for in‑band and out‑of‑band performance as identified in the following tables.

Frequency

Frequency range (MHz)

band

GSM 900

E‑GSM 900

R-GSM 900

MS

BTS

BTS

BTS

in‑band

915 ‑ 980

870 ‑ 925

860 ‑ 925

856 – 921

out‑of‑band (a)

0,1 ‑ < 915

0,1 ‑ < 870

0,1 ‑ < 860

0,1 ‑ < 856

out‑of‑band (b)

N/A

N/A

N/A

N/A

out‑of band (c)

N/A

N/A

N/A

N/A

out‑of band (d)

> 980 ‑ 12,750

> 925 ‑ 12,750

> 925 ‑ 12,750

> 921 ‑ 12,750

Frequency

Frequency range (MHz)

band

DCS 1 800

MS

BTS

in‑band

1 785 ‑ 1 920

1 690 ‑ 1 805

out‑of‑band (a)

0,1 ‑ 1705

0,1 ‑ < 1 690

out‑of‑band (b)

> 1 705 ‑ < 1 785

N/A

out‑of band (c)

> 1 920 ‑ 1 980

N/A

out‑of band (d)

> 1 980 ‑ 12,750

> 1 805 ‑ 12,750

Frequency

Frequency range (MHz)

band

PCS 1 900 MS

PCS 1 900 & MXM 1900 BTS

in‑band

1910 ‑ 2010

1830 – 1930

out‑of‑band (a)

0,1 ‑ < 1830

0,1 ‑ < 1830

out‑of‑band (b)

1830 ‑ < 1910

N/A

out‑of band (c)

> 2010 ‑ 2070

N/A

out‑of band (d)

> 2070 ‑ 12,750

> 1930 – 12,750

Frequency

Frequency range (MHz)

band

GSM 850 MS

GSM 850 & MXM 850 BTS

in‑band

849 ‑ 914

804 – 859

out‑of‑band (a)

0,1 ‑ < 849

0,1 ‑ < 804

out‑of‑band (b)

N/A

N/A

out‑of band (c)

N/A

N/A

out‑of band (d)

> 914‑ 12,750

> 859 – 12,750

Frequency

Frequency range (MHz)

band

GSM 450

GSM 480

MS

BTS

MS

BTS

in‑band

457,6 – 473,6

444,4 – 460,4

486,0 – 502,0

472,8 – 488,8

out‑of‑band (a)

0,1 ‑ < 457,6

0,1 ‑ < 444,4

0,1 ‑ < 486,0

0,1 ‑ < 472,8

out‑of‑band (b)

N/A

N/A

N/A

N/A

out‑of band (c)

N/A

N/A

N/A

N/A

out‑of band (d)

> 473,6 ‑ 12,750

> 460,4 ‑ 12,750

> 502,0 ‑ 12,750

> 488,8 ‑ 12,750

The reference sensitivity performance as specified in tables 1, 1a, 1b, 1c, 1d and 1e shall be met when the following signals are simultaneously input to the receiver:

‑ for all cases except GSM 850 normal BTS, MXM 850 normal BTS and MXM 1900 normal BTS, a useful signal, modulated with the relevant supported modulation (GMSK or 8-PSK), at frequency fo, 3 dB above the reference sensitivity level or input level for reference performance, whichever applicable, as specified in subclause 6.2;

  • for GSM 850 normal BTS, MXM 850 normal BTS and MXM 1900 normal BTS a useful signal, modulated with the relevant supported modulation (GMSK or 8-PSK), at frequency fo, 1 dB above the reference sensitivity level or input level for reference performance, whichever applicable, as specified in subclause 6.2;

‑ a continuous, static sine wave signal at a level as in the table below and at a frequency (f) which is an integer multiple of 200 kHz. For GSM 850 normal BTS, MXM 850 normal BTS and MXM 1900 normal BTS at inband frequency offsets  3 000 kHz this signal is GMSK modulated by any 148‑bit sequence of the 511‑bit pseudo random bit sequence, defined in CCITT Recommendation O.153 fascicle IV.4,

with the following exceptions, called spurious response frequencies:

a) GSM 900 MS and BTS, GSM 850 MS and BTS, and MXM 850 BTS: in band, for a maximum of six occurrences (which if grouped shall not exceed three contiguous occurrences per group);

DCS 1 800, PCS 1 900 MS and BTS and MXM 1900 BTS: in band, for a maximum of twelve occurrences (which if grouped shall not exceed three contiguous occurrences per group);

GSM 400 MS and BTS: in band, for a maximum of three occurrences;

b) out of band, for a maximum of 24 occurrences (which if below f0 and grouped shall not exceed three contiguous occurrences per group).

where the above performance shall be met when the continuous sine wave signal (f) is set to a level of 70 dBµV (emf) (i.e. ‑43 dBm).

NOTE: For testing reasons, a MXM 1900 normal BTS fulfilling the PCS 1900 normal BTS requirements in this paragraph may be considered fulfilling the requirements for MXM 1900 normal BTS.

Frequency

GSM 400, P-, E- and R-GSM 900

DCS 1 800 & PCS 1 900

band

other MS

small MS

BTS

MS

BTS

dBµV

dBm

dBµV

dBm

dBµV

dBm

dBµV

dBm

dBµV

dBm

(emf)

(emf)

(emf)

(emf)

(emf)

in‑band

600 kHz  |f‑fo | < 800 kHz

75

‑38

70

‑43

87

‑26

70

‑43

78

‑35

800 kHz  |f‑fo | < 1,6 MHz

80

‑33

70

‑43

97

‑16

70

‑43

88

‑25

1,6 MHz  |f‑fo | < 3 MHz

90

‑23

80

‑33

97

‑16

80

‑33

88

‑25

3 MHz  |f‑fo |

90

‑23

90

‑23

100

‑13

87

‑26

88

‑25

out‑of‑band

(a)

113

0

113

0

121

8

113

0

113

0

(b)

101

‑12

(c)

101

‑12

(d)

113

0

113

0

121

8

113

0

113

0

NOTE: For definition of small MS, see subclause 1.1.

The following exceptions to the level of the sine wave signal (f) in the above table shall apply:

for E-GSM MS, in the band 905 MHz to 915 MHz

‑5 dBm

for R-GSM 900 MS, in the band 880 MHz to 915 MHz

‑5 dBm

for R-GSM 900 small MS, in the band 876 MHz to 915 MHz

‑7 dBm

for GSM 450 small MS, in the band 450,4 MHz to 457,6 MHz

‑5 dBm

for GSM 480 small MS, in the band 478,8 MHz to 486 MHz

‑5 dBm

for GSM 900 and E-GSM 900 BTS, in the band 925 MHz to 935 MHz

0 dBm

for R-GSM 900 BTS at offsets 600 kHz <= abs (f-f0) < 3 MHz, in the band 876 MHz to 880 MHz

Level reduced by 5 dB

Frequency

GSM 850 MS

GSM 850 & MXM 850 BTS

MXM 1900 BTS

band

dBµV

dBm

dBµV

dBm

dBµV

dBm

(emf)

(emf)

(emf)

in‑band

600 kHz  |f‑fo | < 800 kHz

70

‑43

76

‑37

70

‑43

800 kHz  |f‑fo | < 1,6 MHz

70

‑43

78

‑35

75

‑38

1,6 MHz  |f‑fo | < 3 MHz

80

‑33

80

‑33

80

‑33

3 MHz  |f‑fo |

90

‑23

80

‑33

80

‑33

out‑of‑band

(a)

113

0

121

8

113

0

(b)

(c)

(d)

113

0

121

8

113

0

The blocking characteristics of the micro‑BTS receiver are specified for in‑band and out‑of‑band performance. The out‑of‑band blocking remains the same as a normal BTS and the in-band blocking performance shall be no worse than in the table below.

Frequency band

GSM 900, GSM 850 and MXM 850 micro and pico‑BTS

DCS 1 800, PCS 1900 and

MXM 1900

micro and pico‑BTS

M1

M2

M3

P1

M1

M2

M3

P1

(dBm)

(dBm)

(dBm)

(dBm)

(dBm)

(dBm)

(dBm)

(dBm)

in‑band

600 kHz  |f‑f0| < 800 kHz

‑31

‑26

‑21

‑34

‑40

‑35

‑30

-41

800 kHz  |f‑f0| < 1,6 MHz

‑21

‑16

‑11

‑34

‑30

‑25

‑20

-41

1,6 MHz  |f‑f0| < 3 MHz

‑21

‑16

‑11

‑26

‑30

‑25

‑20

-31

3 MHz  |f‑f0|

‑21

‑16

‑11

‑18

‑30

‑25

‑20

-23

The blocking performance for the pico-BTS attempts, for the scenario of a close proximity uncoordinated MS, to balance the impact due to blocking by the MS with that due to wideband noise overlapping the wanted signal.

5.2 AM suppression characteristics

The reference sensitivity performance as specified in tables 1, 1a, 1b, 1c, 1d and 1e shall be met when the following signals are simultaneously input to the receiver.

– A useful signal, modulated with the relevant supported modulation (GMSK or 8-PSK), at frequency fo, 3 dB above the reference sensitivity level or input level for reference performance, whichever applicable, as specified in subclause 6.2.

‑ A single frequency (f), in the relevant receive band, | f‑fo | > 6 MHz, which is an integer multiple of 200 kHz, a GSM TDMA signal modulated in GMSK and by any 148‑bit sequence of the 511‑bit pseudo random bit sequence, defined in CCITT Recommendation O.153 fascicle IV.4, at a level as defined in the table below. The interferer shall have one timeslot active and the frequency shall be at least 2 channels separated from any identified spurious response. The transmitted bursts shall be synchronized to but delayed in time between 61 and 86 bit periods relative to the bursts of the wanted signal.

NOTE: When testing this requirement, a notch filter may be necessary to ensure that the co‑channel performance of the receiver is not compromised.

Micro and pico‑BTS

MS

BTS

M1

M2

M3

P1

(dBm)

(dBm)

(dBm)

(dBm)

(dBm)

(dBm)

GSM 400

-31

-31

**

**

**

**

GSM 900

-31

-31

-34

-29

-24

-21

GSM 850

-31

-31

-34

-29

-24

-21

MXM 850

-33

-34

-29

-24

-21

DCS 1 800

-29 / -31*

-35

-33

-28

-23

-26

PCS 1 900

-31

-35

-33

-28

-23

-26

MXM 1900

-35

-33

-28

-23

-26

NOTE 1: * The ‑31 dBm level shall only apply to DCS 1800 class 1 and class 2 MS meeting the ‑102 dBm reference sensitivity level requirement according to subclause 6.2.

NOTE 2: ** These BTS types are not defined.

5.3 Intermodulation characteristics

The reference sensitivity performance as specified in tables 1, 1a, 1b, 1c, 1d and 1e shall be met when the following signals are simultaneously input to the receiver:

‑ a useful signal at frequency fo, 3 dB above the reference sensitivity level or input level for reference performance, whichever applicable, as specified in subclause 6.2;

‑ a continuous, static sine wave signal at frequency f1 and a level of 70 dBµV (emf) (i.e. ‑43 dBm):

‑ for GSM 400 small MSs and GSM 900 small MSs and GSM 850 small MSs, DCS 1 800 and PCS 1 900 MS and DCS 1 800, PCS 1 900 and MXM 1900 BTS this value is relaxed to 64 dBµV (emf) (i.e. ‑49 dBm);

‑ for the DCS 1 800 class 3 MS this value is relaxed to 68 dBµV (emf) (i.e. ‑45 dBm);

‑ any 148‑bits subsequence of the 511‑bits pseudo‑random sequence, defined in CCITT Recommendation O.153 fascicle IV.4 GMSK modulating a signal at frequency f2, and a level of 70 dBµV (emf) (i.e. ‑43 dBm):

‑ for GSM 400 small MSs and GSM 900 small MSs and GSM 850 small MSs, DCS 1 800 and PCS 1 900 MS and DCS 1 800, PCS 1 900 and MXM 1900 BTS this value is relaxed to 64 dBµV (emf) (i.e. ‑49 dBm);

‑ for the DCS 1 800 class 3 MS this value is relaxed to 68 dBµV (emf) (i.e. ‑45 dBm);

such that f0 = 2f1 ‑ f2 and |f2‑f1 | = 800 kHz.

NOTE: For subclauses 5.2 and 5.3 instead of any 148‑bits subsequence of the 511‑bits pseudo‑random sequence, defined in CCITT Recommendation O.153 fascicle IV.4, it is also allowed to use a more random pseudo‑random sequence.

5.4 Spurious emissions

The spurious emissions for a BTS receiver, measured in the conditions specified in subclause 4.3.1, shall be no more than:

‑ 2 nW (‑57 dBm) in the frequency band 9 kHz to 1 GHz;

‑ 20 nW (‑47 dBm) in the frequency band 1 GHz to 12.75 GHz.

NOTE: For radiated spurious emissions for the BTS, the specifications currently only apply to the frequency band 30 MHz to 4 GHz. The specification and method of measurement outside this band are under consideration.