10 Fullband telephony transmission performance test methods

26.1323GPPRelease 17Speech and video telephony terminal acoustic test specificationTS

10.1 Applicability

The test methods in this clause shall apply when testing a UE that is used to provide fullband telephony, either as a stand-alone service, or as part of a multimedia service.

The application force used to apply the handset against the artificial ear shall be 8 ± 2 N. For the headset case, the application of the headset shall comply with ITU-T Recommendation P.57 [14].

10.2 Overall loss/loudness ratings

10.2.1 General

The test method is the same as for super-wideband (see sub-clause 9.2.1).

10.2.2 Connections with handset UE

The description is the same as for super-wideband (see sub-clause 9.2.2).

10.2.2.1 Sending loudness rating (SLR)

The test method is the same as for super-wideband (see sub-clause 9.2.2.1).

10.2.2.2 Receiving loudness rating (RLR)

The test method is the same as for super-wideband (see sub-clause 9.2.2.2, observing the signal properties for fullband described in sub-clause 5.4).

10.2.2.3 Receiving loudness rating (RLR) in the presence of background noise

The test method is the same as for super-wideband (see sub-clause 9.2.2.3, observing the signal properties for fullband described in sub-clause 5.4).

10.2.3 Connections with desktop and vehicle-mounted hands-free UE

The description is the same as for super-wideband (see sub-clause 9.2.3).

10.2.3.1 Sending loudness rating (SLR)

The test method is the same as for super-wideband (see sub-clause 9.2.3.1).

10.2.3.2 Receiving loudness rating (RLR)

The test method is the same as for super-wideband (see sub-clause 9.2.3.2, observing the signal properties for fullband described in sub-clause 5.4).

10.2.4 Connections with hand-held hands-free UE

10.2.4.1 Sending loudness rating (SLR)

The test method is the same as for super-wideband (see sub-clause 9.2.4.1).

10.2.4.2 Receiving loudness rating (RLR)

The test method is the same as for super-wideband (see sub-clause 9.2.4.2, observing the signal properties for fullband described in sub-clause 5.4).

10.2.5 Connections with headset UE

The description is the same as for super-wideband (see sub-clause 9.2.5).

10.2.6 Connections with electrical interface UE

10.2.6.1 Sending junction loudness rating (SJLR)

The description is the same as for wideband (see sub-clause 8.2.6.1).

10.2.6.2 Receving junction loudness rating (RJLR)

The description is the same as for wideband (see sub-clause 8.2.6.2).

10.3 Idle channel noise (handset, headset and electrical interface UE)

The test method is the same as for super-wideband (see sub-clause 9.3).

10.3.0 Overview

10.3.1 Sending (handset and headset UE)

The test method is the same as for super-wideband (see sub-clause 9.3.1), except that the noise level is measured in the frequency range from 100 Hz to 20 kHz.

10.3.2 Receiving (handset and headset UE)

The test method is the same as for super-wideband (see sub-clause 9.3.2), except that the noise level is measured in the frequency range from 100 Hz to 20 kHz.

10.3.3 Sending (electrical interface UE)

Same method as in clause 10.3.1.

10.3.4 Receiving (electrical interface UE)

Same method as in clause 10.3.1, except that the idle noise signal is captured at the receive output of the electrical reference interface.

10.4 Sensitivity/frequency characteristics

10.4.0 General

For checking the sensitivity/frequency characteristics against performance requirements (as in e.g., 3GPP TS 26.131 [1]), any given tolerance mask shall be defined for each center frequency of the fractional octave bands, which is used in the respective test method. If necessary, the tolerance mask is interpolated linearly for a certain center frequency between the two closest neighbouring data points on a log-frequency scale and the magnitude in dB.

10.4.1 Handset and headset UE sending

The test method is the same as for super-wideband (see sub-clause 9.4.1).

10.4.2 Handset and headset UE receiving

The test method is the same as for super-wideband (see sub-clause 9.4.2, observing the signal properties for fullband described in sub-clause 5.4).

10.4.3 Desktop and vehicle-mounted hands-free UE sending

The test method is the same as for super-wideband (see sub-clause 9.4.3).

10.4.4 Desktop and vehicle-mounted hands-free UE receiving

The test method is the same as for super-wideband (see sub-clause 9.4.4, observing the signal properties for fullband described in sub-clause 5.4).

10.4.5 Hand-held hands-free UE sending

The test method is the same as for super-wideband (see sub-clause 9.4.5, observing the signal properties for fullband described in sub-clause 5.4).

10.4.6 Hand-held hands-free UE receiving

The test method is the same as for super-wideband (see sub-clause 9.4.6, observing the signal properties for fullband described in sub-clause 5.4).

10.4.7 Electrical interface UE sending

The test method is the same as for super-wideband (see sub-clause 9.4.7).

10.4.8 Electrical interface UE receiving

The test method is the same as for super-wideband (see sub-clause 9.4.8, observing the signal properties for fullband described in sub-clause 5.4).

10.5 Sidetone characteristics

10.5.1 Connections with handset UE

The test method is the same as for super-wideband (see sub-clause 9.5.1).

10.5.2 Headset UE

The test method is the same as for super-wideband (see sub-clause 9.5.2).

10.5.3 Hands-free UE (all categories)

No requirement other than echo control.

9.5.3a Electrical interface UE

The test method is the same as for wideband (see sub-clause 8.5.3a).

10.5.4 Sidetone delay for handset, headset or electrical interface UE

The test method is the same as for super-wideband (see sub-clause 9.5.4).

10.6 Stability loss

Where a user-controlled volume control is provided it is set to maximum.

Handset UE: The handset is placed on a hard plane surface with the earpiece facing the surface.

Headset UE: The requirement applies for the closest possible position between microphone and headset receiver within the intended wearing position.

NOTE: Depending on the type of headset it may be necessary to repeat the measurement in different positions.

Hands-free UE (all categories): No requirement other than echo loss.

Before the actual test a training sequence consisting of the British-English single talk sequence described in ITU-T Recommendation P.501 [22] is applied. The training sequence level shall be ‑16 dBm0 in order to not overload the codec.

The test signal is a PN-sequence complying with ITU-T Recommendation P.501 with a length of 4 096 points (for a 48 kHz sampling rate system) and a crest factor of 6 dB instead of 11 dB. The PN-sequence is generated as described in P.501 with W(k) constant within the frequency range 100-20000 Hz and zero outside this range. The duration of the test signal is 250 ms. With an input signal of ‑3 dBm0, the attenuation from input to output of the system simulator shall be measured under the following conditions:

a) The handset or the headset, with the transmission circuit fully active, shall be positioned on a hard plane surface with at least 400 mm free space in all directions. The earpiece shall face towards the surface as shown in figure 21;

b) The headset microphone is positioned as close as possible to the receiver(s) within the intended wearing position;

c) For a binaural headset, the receivers are placed symmetrically around the microphone.

NOTE: All dimensions in mm.

Figure 21. Test configuration for stability loss measurement on handset or headset UE

The attenuation from input to output shall be measured in the frequency range from 100 Hz to 20 kHz. The spectral distribution of the output signal is analysed with a 4k FFT (for a 48 kHz sample rate test system), thus the measured part of the output signal is 85,333 ms. To avoid leakage effects the frequency resolution of the FFT must be the same as the frequency spacing of the PN-sequence.

10.7 Acoustic echo control

10.7.1 General

The description is the same as for super-wideband (see sub-clause 9.7.1).

10.7.2 Acoustic echo control in a hands-free UE

The test method is the same as for super-wideband (see sub-clause 9.7.2, observing the signal properties for fullband described in sub-clause 5.4).

10.7.3 Acoustic echo control in a handset UE

The test method is the same as for super-wideband (see sub-clause 9.7.3, observing the signal properties for fullband described in sub-clause 5.4).

10.7.4 Acoustic echo control in a headset UE

The test method is the same as for super-wideband (see sub-clause 9.7.4, observing the signal properties for fullband described in sub-clause 5.4).

10.7.5 Acoustic echo control in a electrical interface UE

The test method is the same as for super-wideband (see sub-clause 9.7.5, observing the signal properties for fullband described in sub-clause 5.4).

10.8 Distortion

10.8.1 Sending distortion

The test method is the same as for super-wideband (see sub-clause 9.8.1).

10.8.2 Receiving Distortion

The test method is the same as for super-wideband (see sub-clause 9.8.2, observing the signal properties for fullband described in sub-clause 5.4).

10.9 Void

10.10 Delay

10.10.0 UE Delay Measurement Methodologies

The test method is the same as in super-wideband (see clause 9.10.0).

10.10.1 Delay in sending direction (handset UE)

The test method is the same as in super-wideband (see clause 9.10.1)..

10.10.1a Delay in sending direction (headset UE)

The test method is the same as in super-wideband (see clause 9.10.1a).

10.10.1b Delay in sending direction (electrical interface UE)

The test method is the same as in super-wideband (see clause 9.10.1b).

10.10.2 Delay in receiving direction (handset UE)

The test method is the same as in super-wideband (see clause 9.10.2, observing the test signal properties for fullband described in clause 5.4).

10.10.2a Delay in receiving direction (headset UE)

The test method is the same as in super-wideband (see clause 9.10.2a, observing the test signal properties for fullband described in clause 5.4).

10.10.2b Delay in receiving direction (electrical interface UE)

The test method is the same as in super-wideband (see clause 9.10.2b, observing the test signal properties for fullband described in clause 5.4).

10.10.3 Delay in sending + receiving direction using "echo" method (handset UE)

The test method is the same as in super-wideband (see clause 9.10.3, observing the test signal properties for fullband described in clause 5.4).

10.10.3a Delay in sending + receiving direction using "echo" method (headset UE)

The test method is the same as in super-wideband (see clause 9.10.3a, observing the test signal properties for fullband described in clause 5.4).

10.10.3b Delay in sending + receiving direction using "echo" method (electrical interface UE)

The test method is the same as in super-wideband (see clause 9.10.3b, observing the test signal properties for fullband in clause 5.4).

10.10.4 Delay and speech quality in conditions with packet arrival time variations and packet loss (handset, headset, electrical interface UE)

10.10.4.1 Delay in sending direction

The test method is the same as in super-wideband (see clause 9.10.4.1).

10.10.4.2 Delay in receiving direction

The test method is the same as in super-wideband (see clause 9.10.4.2, observing the test signal properties for fullband described in clause 5.4).

10.10.4.3 Speech quality loss in conditions with packet arrival time variations and packet loss

For further study.

NOTE: Version 2.4 of Recommendation ITU-T P.863 [44] referenced in the present document was developed and validated for applications up to super-wideband bandwidth. Version 3.0 (or later) provides support for several fullband applications and may be used in this clause.

10.10.5 UE send clock accuracy

The test method is the same as in super-wideband (see clause 9.10.5, observing the test signal properties for fullband described in clause 5.4).

10.10.6 UE receiving with clock skew

For further study.

10.11 Echo control characteristics

10.11.1 Test set-up and test signals

The test method is the same as for super-wideband (see sub-clause 9.11.1, observing the signal properties for fullband described in sub-clause 5.4).

10.11.2 Test method

The test method is the same as for super-wideband (see sub-clause 9.11.2, observing the signal properties for fullband described in sub-clause 5.4).

10.11.2.1 Signal alignment

The test method is the same as for super-wideband (see sub-clause 9.11.2.1).

10.11.2.2 Signal level computation and frame classification

The test method is the same as for super-wideband (see sub-clause 9.11.2.2).

10.11.2.3 Classification into categories

The test method is the same as for super-wideband (see sub-clause 9.11.2.3).

10.12 Send speech quality and noise intrusiveness in the presence of ambient noise

10.12.1 Handset UE

The test method is the same as in super-wideband (see sub-clause 9.12.1).

10.12.2 Hand-held hands-free UE

The test method is the same as in super-wideband (see sub-clause 9.12.2).

10.12.3 Electrical interface UE

The test method is the same as in super-wideband (see sub-clause 9.12.3).

10.13 Jitter buffer management behaviour (handset, headset and electrical interface UE)

The test method is the same as in super-wideband (see clause 9.13, observing the test signal properties for fullband described in clause 5.4).

10.13.0 General

The same considerations as described in clause 9.13.0 apply for fullband mode. The test methods are the same as in super-wideband (see clause 9.13, observing the test signal properties for fullband described in clause 5.4).

10.13.1 Delay histogram

The test method are the same as in super-wideband (see clause 9.13.1, observing the test signal properties for fullband described in clause 5.4).

10.13.2 Speech quality loss histogram

For further study.

NOTE: Version 2.4 of Recommendation ITU-T P.863 [44] referenced in the present document was developed and validated for applications up to super-wideband bandwidth. Version 3.0 (or later) provides support for several fullband applications and may be used in this clause.

Annex A (informative): Void

Annex B (informative):
Reference algorithm for echo control characteristics evaluation.