8 Radiated spurious emissions

11.213GPPBase Station System (BSS) equipment specificationRadio aspectsRelease 1999TS

8.1 Test Purpose

This test measures radiated spurious emissions from the BSS cabinet, including emissions due to the transmitters.

8.2 Test Case

a) A test site fulfilling the requirements of ITU-R SM.329-7 [16] shall be used. The BTS shall be placed on a non‑conducting support and shall be operated from a power source via an RF filter to avoid radiation from the power leads. The method of ITU-R SM.329-7 [16] shall be used, except in any case where it conflicts with the present document.

Radiation of any spurious components shall be detected by the test antenna and measuring receiver (e.g. a spectrum analyser). At each frequency at which a component is detected, the BSS shall be rotated and the height of the test antenna adjusted to obtain maximum response, and the effective radiated power of that component determined by a substitution measurement. The measurement shall be repeated with the test antenna in the orthogonal polarization plane.

b) The BTS shall be configured with one transmitter active, at its maximum output power on all time slots, on the specified ARFCNs. Slow frequency hopping shall be disabled.

NOTE: It may be necessary to take steps to ensure that emissions from other transmitters which are not active do not influence the results. This may be achieved by, for example, equipping the BTS with only one TRX or by muting the outputs of the transmitters to a greater degree than otherwise required in GSM 05.05 (ETS 300 910) [7].

c) The measuring receiver shall be configured with a resolution bandwidth of 30 kHz and a video bandwidth of approximately three times this value. Peak hold shall be enabled. The received power shall be measured for frequencies with an offset of 1.8 MHz  f < 6 MHz from the carrier frequency, and which fall within the BTS relevant transmitter band.

At each frequency at which a component is detected, the maximum effective radiated power of that component shall be determined, as described in step a).

d) The measuring receiver shall be configured with a resolution bandwidth of 100 kHz and a video bandwidth of approximately three times this value. Peak hold shall be enabled. The received power shall be measured for frequencies with an offset of 6 MHz from the carrier frequency, and which fall within the BTS relevant transmitter band.

At each frequency at which a component is detected, the maximum effective radiated power of that component shall be determined, as described in step a).

e) The BSS shall be configured with all transmitters active at their maximum output power on all time slots. If a TRX is designated as being a dedicated BCCH, it shall be allocated to RF channel M. All remaining TRXs shall be allocated in the following order; first to RF channel B, then to T, then distributed as evenly as possible throughout the BSS operating transmit band. Slow frequency hopping shall be disabled.

The measuring receiver shall be configured as defined in table 27. Peak hold shall be enabled, and the video bandwidth shall be approximately three times the resolution bandwidth. If this video bandwidth is not available on the measuring receiver, it shall be the maximum available, and at least 1 MHz. The received power shall be measured over the frequency range 30 MHz to 4 GHz, excluding the BTS relevant transmitter band.

Table 27: Spurious Emissions Measurements outside the transmit band

Frequency Band

Frequency offset

Resolution Bandwidth

30 MHz ‑ 50 MHz

10 kHz

50 MHz ‑ 500 MHz and outside the

relevant transmit band

(offset from the edge of the relevant transmit band)

 2 MHz

30 kHz

 5 MHz

100 kHz

500 MHz ‑ 4 GHz and outside the relevant transmit band

(offset from the edge of the relevant transmit band)

2 MHz

30 kHz

5 MHz

100 kHz

10 MHz

300 kHz

20 MHz

1 MHz

30 MHz

3 MHz

At each frequency at which a component is detected, the maximum effective radiated power of that component shall be determined, as described in step a).

8.3 Essential conformance

Test Environment:

Normal: Inside the relevant TX band: The test shall be performed with the TRX active on one ARFCN.

Outside the relevant TX band: The test shall be performed once.

Conformance Requirement

a) The power measured at steps c) and d) shall not exceed ‑36 dBm.

b) The power measured at step e) shall not exceed:

‑36 dBm for frequencies up to 1 GHz.

‑30 dBm for frequencies above 1 GHz.

8.4 Complete conformance

Test Environment:

Normal: Inside the relevant TX band: The test shall be performed three times with the TRX on one of the RF channels B, M, and T.

Outside the relevant TX band: The test shall be repeated until a measurement has been made with a TRX active on B, M and T

NOTE: For a BSS with 3 or more TRX, this requires only one measurement.

Conformance Requirement

a) The power measured at steps c) and d) shall not exceed ‑36 dBm.

b) The power measured at step e) shall not exceed:

‑36 dBm for frequencies up to 1 GHz.

‑30 dBm for frequencies above 1 GHz.

8.5 Requirement reference

GSM 05.05 (ETS 300 910) [7], subclause 4.3.