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Content for  TS 26.131  Word version:  18.1.0

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5.12  Delay |R11|p. 30

5.12.0  UE delay definition |R12|p. 30

5.12.0.1  Acoustic interfaces |R17|p. 30

For UMTS circuit-switched operation and MTSI-based speech with LTE, NR or WLAN access, the UE delays in the send and receive directions are defined for acoustic interfaces as:
  • The UE delay in the send (uplink) direction is the delay between the first acoustic event at the MRP to the last bit of the corresponding speech frame at the UE antenna
  • The UE delay in the receive (downlink) direction is the delay between the first bit of a speech frame at the UE antenna and the first acoustic event at the DRP corresponding to that speech frame
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5.12.0.2  Electrical interfaces |R17|p. 31

The UE delays in the send and receive directions are defined for electrical interfaces as:
  • The UE delay in the send (uplink) direction is the delay between the first electrical event at the input of the electrical interface (analogue or wired digital connection) or first bit of a speech frame at the UE antenna of the wireless digital interface (wireless digital connection) to the last bit of the corresponding speech frame at the UE antenna
  • The UE delay in the receive (downlink) direction is the delay between the first bit of a speech frame at the UE antenna and the first electrical event at the output of the electrical interface (analogue or wired digital connection) or first bit of a speech frame at the UE antenna of the wireless digital interface (wireless digital connection) corresponding to that speech frame.
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5.12.1  Handset UEp. 31

It is in general desirable to minimize UE delays to ensure low enough end-to-end delays and hence a good conversational experience, guidance is found in ITU-T Recommendation G.114.
For UMTS circuit-switched AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall in any case be ≤ 220ms and should be ≤ 185ms.
For MTSI-based speech-only with LTE, NR or WLAN access in error and jitter free conditions and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) should be ≤ 150ms. If this performance objective cannot be met, the sum of the UE delays in sending and receiving directions (TS + TR) shall in any case be ≤ 190ms.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall be less than or equal to the delay requirements in Table 8bis, while meeting the speech quality targets defined.
Test Condition Delay and Loss Profile
(Note 1)
Performance Objectives for Maximum Delay Requirements for Maximum Delay Speech Quality Requirements
(Note 2)
0Error and jitter free conditionTS + TR ≤ 150msTS + TR ≤ 190ms No requirement, reference score
MOS-LQOREF
1dly_profile_20msDRX_10pct_BLER_e2eTS + TR ≤ 150msTS + TR ≤ 190ms MOS-LQOTEST
MOS-LQOREF - 0.3
2dly_profile_40msDRX_10pct_BLER_e2eTS + TR ≤ 190msTS + TR ≤ 230ms MOS-LQOTEST ≥ MOS-LQOREF - 0.3
NOTE 1:
The delay profiles for test condition 1 and 2 are theoretically constructed to simulate a semi-persistent scheduling transmission scheme with DRX enabled and target BLER in sending and receiving directions of 10%, with +/- 3ms of EPC jitter. Delay profiles are injected at the IP layer of the test system. Delay profiles are attached electronically to document TS 26.132. The delay profiles in test condition 1 and 2 are static delay variation conditions and do not expose the UE to packet delay variations in the full range of the packet delay budget as defined for QCI1 in TS 23.203. A third test condition that exposes the UE to non-stationary packet delay variations experienced in live operation and packet delay variations in the full range of the packet delay budget for QCI1, and accompanied delay and speech quality requirements, is for further study.
NOTE 2:
The purpose of this test is to provide a relative comparison of the objective speech quality between the reference and test conditions. This test is not to be construed as a method to evaluate the absolute objective speech quality of the device.
Compliance shall be checked by the relevant tests described in TS 26.132.
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5.12.2  Headset UEp. 32

5.12.2.1  Wired headsetp. 32

It is in general desirable to minimize UE delays to ensure low enough end-to-end delays and hence a good conversational experience, guidance is found in ITU-T Recommendation G.114.
For UMTS circuit-switched AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall in any case be ≤ 220ms and should be ≤ 185ms.
For MTSI-based speech-only with LTE, NR or WLAN access in error and jitter free conditions and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) should be ≤ 150ms. If this performance objective cannot be met, the sum of the UE delays in sending and receiving directions (TS + TR) shall in any case be ≤ 190ms.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall be less than or equal to the delay requirements in Table 8ter, while meeting the speech quality targets defined.
Test Condition Delay and Loss Profile (Note 1) Performance Objectives for Maximum Delay Requirements for Maximum Delay Speech Quality Requirements (Note 2)
0Error and jitter free conditionTS + TR ≤ 150msTS + TR ≤ 190ms No requirement, reference score MOS-LQOREF
1dly_profile_20msDRX_10pct_BLER_e2eTS + TR ≤ 150msTS + TR ≤ 190ms MOS-LQOTEST ≥ MOS-LQOREF - 0.3
2dly_profile_40msDRX_10pct_BLER_e2eTS + TR ≤ 190msTS + TR ≤ 230ms MOS-LQOTEST ≥ MOS-LQOREF - 0.3
NOTE 1:
The delay profiles for test condition 1 and 2 are theoretically constructed to simulate a semi-persistent scheduling transmission scheme with DRX enabled and target BLER in sending and receiving directions of 10%, with +/- 3ms of EPC jitter. Delay profiles are injected at the IP layer of the test system. Delay profiles are attached electronically to document TS 26.132. The delay profiles in test condition 1 and 2 are static delay variation conditions and do not expose the UE to packet delay variations in the full range of the packet delay budget as defined for QCI1 in TS 23.203. A third test condition that exposes the UE to non-stationary packet delay variations experienced in live operation and packet delay variations in the full range of the packet delay budget for QCI1, and accompanied delay and speech quality requirements, is for further study.
NOTE 2:
The purpose of this test is to provide a relative comparison of the objective speech quality between the reference and test conditions. This test is not to be construed as a method to evaluate the absolute objective speech quality of the device.
Compliance shall be checked by the relevant tests described in TS 26.132.
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5.12.2.2  Wireless headsetp. 33

For further study.

5.12.3  Electrical interface UE |R17|p. 33

It is in general desirable to minimize UE delays to ensure low enough end-to-end delays and hence a good conversational experience, guidance is found in ITU-T Recommendation G.114.
The delay budget BD to be considered in the performance requirements and objectives depends on the type of electrical interface UE and is given by Table 8quater1.
Electrical interface type BD [ms]
Analogue0
Wireless digital20
Wired digital20
NOTE:
The delay for analogue to digital conversion (and vice versa) in the wired digital connection is considered to be part of the budget allowance for vendor specific implementation in the UE delay requirements.
For UMTS circuit-switched AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall in any case be ≤ 220+BD ms and should be ≤ 185+BD ms.
For MTSI-based speech-only with LTE, NR or WLAN access in error and jitter free conditions and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) should be ≤ 150+BD ms. If this performance objective cannot be met, the sum of the UE delays in sending and receiving directions (TS + TR) shall in any case be ≤ 190+BD ms.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall be less than or equal to the delay requirements in Table 8quater2, while meeting the speech quality targets defined.
Test Condition Delay and Loss Profile (Note 1) Performance Objectives for Maximum Delay Requirements for Maximum Delay Speech Quality Requirements (Note 2)
0Error and jitter free conditionTS + TR ≤ 150+BD msTS + TR ≤ 190+BD ms No requirement, reference score MOS-LQOREF
1dly_profile_20msDRX_10pct_BLER_e2eTS + TR ≤ 150+BD msTS + TR ≤ 190+BD ms MOS-LQOTEST ≥ MOS-LQOREF -0.3
2dly_profile_40msDRX_10pct_BLER_e2eTS + TR ≤ 190+BD msTS + TR ≤ 230+BD ms MOS-LQOTEST ≥ MOS-LQOREF -0.3
NOTE 1:
The delay profiles for test condition 1 and 2 are theoretically constructed to simulate a semi-persistent scheduling transmission scheme with DRX enabled and target BLER in sending and receiving directions of 10%, with +/- 3ms of EPC jitter. Delay profiles are injected at the IP layer of the test system. Delay profiles are attached electronically to document TS 26.132. The delay profiles in test condition 1 and 2 are static delay variation conditions and do not expose the UE to packet delay variations in the full range of the packet delay budget as defined for QCI1 in TS 23.203. A third test condition that exposes the UE to non-stationary packet delay variations experienced in live operation and packet delay variations in the full range of the packet delay budget for QCI1, and accompanied delay and speech quality requirements, is for further study.
NOTE 2:
The purpose of this test is to provide a relative comparison of the objective speech quality between the reference and test conditions. This test is not to be construed as a method to evaluate the absolute objective speech quality of the device.
Compliance shall be checked by the relevant tests described in TS 26.132.
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5.13  Echo control characteristics |R11|p. 34

Echo cancellation is commonly deployed in the UE to fulfil the Acoustic echo control requirements. Echo cancellers are complex devices of which the subjective performance is affected by several attributes. The main attribute is its ability to suppress echo. The process of suppressing the echo may introduce impairments to the near-end speech signal, mainly manifested as distortion or clipping of the near-end signal during simultaneous speech from both the far and near-end ("double-talk").
To characterise the echo control performance, the activity (in % of total time) and averaged level difference (in dB) of the duration of any level difference according to Figure 5.13-1 and Table 8a between the clean near-end signal and the send-signal shall be reported for "double-talk" as well as the far-end single talk periods adjacent to the "double-talk".
All percentage values and averaged level differences described in the relevant test of TS 26.132 shall be reported.
Copy of original 3GPP image for 3GPP TS 26.131, Fig. 5.13-1: Classification of echo canceller performance
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Category Description
A1Full-duplex and full transparency
A2Full-duplex with level loss in Tx
BVery short clipping
CShort clipping resulting in loss of syllables
DClipping resulting in loss of words
EVery short residual echo
FEcho bursts
GContinuous echo
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5.13.1  Handsetp. 35

Requirements are for further study.

5.13.2  Headsetp. 35

Requirements are for further study.

5.13.3  Handheld hands-freep. 35

Requirements are for further study.

5.13.4  Desktop hands-freep. 36

Requirements are for further study.

5.13.5  Electrical interface |R17|p. 36

Requirements are for further study.

5.14  Clock accuracy |R14|p. 36

For MTSI-based speech-only with LTE, NR or WLAN access, the clock skew in send direction between the device under test and the reference client should be less than 50 PPM (in absolute value) in error-free conditions.
Compliance shall be checked by the relevant test described in TS 26.132.

5.15  Jitter buffer management behaviour |R14|p. 36

5.15.0  General |R18|p. 36

The UE delay definition is the same as in clause 5.12.0.

5.15.1  Handset UE |R18|p. 36

It is in general desirable to minimize UE delays to ensure low enough end-to-end delays and hence a good conversational experience, guidance is found in ITU-T Recommendation G.114.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall be less than or equal to the delay requirements in Table 8c1, while meeting the speech quality targets defined.
Profile Delay and Loss Profile Performance Objectives for Maximum Delay Requirements for Maximum Delay Speech Quality Requirements
(see Note)
0Error free condition with minimal jitter Same as profile 0 in Table 8bis Same as profile 0 in Table 8bisNo requirement, reference score MOS-LQOREF
1artificial_volte_profileTS + TR ≤ 270msTS + TR ≤ 310ms MOS-LQOTEST ≥ MOS-LQOREF - [0.4]
NOTE:
The purpose of this test is to provide a relative comparison of the objective speech quality between the reference and test conditions. This test is not to be construed as a method to evaluate the absolute objective speech quality of the device.
Compliance shall be checked by the relevant tests described in TS 26.132.
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5.15.2  Headset UE |R18|p. 36

5.15.2.1  Wired headsetp. 36

It is in general desirable to minimize UE delays to ensure low enough end-to-end delays and hence a good conversational experience, guidance is found in ITU-T Recommendation G.114.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall be less than or equal to the delay requirements in Table 8c2, while meeting the speech quality targets defined.
Profile Delay and Loss Profile Performance Objectives for Maximum Delay Requirements for Maximum Delay Speech Quality Requirements
(see Note)
0Error free condition with minimal jitter Same as profile 0 in Table 8ter Same as profile 0 in Table 8terNo requirement, reference score MOS-LQOREF
1artificial_volte_profileTS + TR ≤ 270msTS + TR ≤ 310ms MOS-LQOTEST ≥ MOS-LQOREF - [0.4]
NOTE:
The purpose of this test is to provide a relative comparison of the objective speech quality between the reference and test conditions. This test is not to be construed as a method to evaluate the absolute objective speech quality of the device.
Compliance shall be checked by the relevant tests described in TS 26.132.
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5.15.2.2  Wireless headsetp. 37

For further study.

5.15.3  Electrical interface UE |R18|p. 37

It is in general desirable to minimize UE delays to ensure low enough end-to-end delays and hence a good conversational experience, guidance is found in ITU-T Recommendation G.114.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and AMR speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) shall be less than or equal to the delay requirements in Table 8c3, while meeting the speech quality targets defined. The delay budget BD to be considered in the performance requirements and objectives depends on the type of electrical interface UE and is given by Table 8quater1.
Profile Delay and Loss Profile Performance Objectives for Maximum Delay Requirements for Maximum Delay Speech Quality Requirements
(see Note)
0Error free condition with minimal jitter Same as profile 0 in Table 8quater2 Same as profile 0 in Table 8quater2No requirement, reference score MOS-LQOREF
1artificial_volte_profileTS + TR ≤ 270+BD msTS + TR ≤ 310+BD ms MOS-LQOTEST ≥ MOS-LQOREF - [0.4]
NOTE:
The purpose of this test is to provide a relative comparison of the objective speech quality between the reference and test conditions. This test is not to be construed as a method to evaluate the absolute objective speech quality of the device.
Compliance shall be checked by the relevant tests described in TS 26.132.
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