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Content for  TS 26.131  Word version:  18.0.0

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8.11  Delayp. 91

8.11.0  UE delay definitionp. 91

8.11.0.1  Acoustic interfaces |R17|p. 91

For 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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8.11.0.2  Electrical interfaces |R17|p. 91

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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8.11.1  Handset UEp. 91

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 error and jitter free conditions and EVS speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) should be ≤ 157ms. 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 ≤ 197ms.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and EVS 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 33a1, 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 ≤ 157msTS + TR ≤ 197ms ffs
1dly_profile_20msDRX_10pct_BLER_e2eTS + TR ≤ 157msTS + TR ≤ 197ms ffs
2dly_profile_40msDRX_10pct_BLER_e2eTS + TR ≤ 197msTS + TR ≤ 237ms ffs
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:
P.863 is limited to 14 kHz bandwidth; therefore the speech quality requirements are ffs.
Compliance shall be checked by the relevant tests described in TS 26.132.
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8.11.2  Headset UEp. 92

8.11.2.1  Wired headsetp. 92

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 error and jitter free conditions and EVS speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) should be ≤ 157ms. 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 ≤ 197ms.
For MTSI-based speech-only with LTE, NR or WLAN access in conditions with simulated packet arrival time variations and packet loss and EVS 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 33a2, 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 ≤ 157msTS + TR ≤ 197ms ffs
1dly_profile_20msDRX_10pct_BLER_e2eTS + TR ≤ 157msTS + TR ≤ 197ms ffs
2dly_profile_40msDRX_10pct_BLER_e2eTS + TR ≤ 197msTS + TR ≤ 237ms ffs
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:
P.863 is limited to 14 kHz bandwidth; therefore, the speech quality requirements are ffs.
Compliance shall be checked by the relevant tests described in TS 26.132.
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8.11.2.2  Wireless headsetp. 93

For further study.

8.11.3  Electrical interface UE |R17|p. 93

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 33a3.
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 MTSI-based speech-only with LTE, NR or WLAN access in error and jitter free conditions and EVS speech codec operation, the sum of the UE delays in sending and receiving directions (TS + TR) should be ≤ 157+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 ≤ 197+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 EVS 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 33a3, 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 ≤ 157+BD msTS + TR ≤ 197+BD ms ffs
1dly_profile_20msDRX_10pct_BLER_e2eTS + TR ≤ 157+BD msTS + TR ≤ 197+BD ms ffs
2dly_profile_40msDRX_10pct_BLER_e2eTS + TR ≤ 197+BD msTS + TR ≤ 237+BD ms ffs
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:
P.863 is limited to 14 kHz bandwidth; therefore the speech quality requirements are ffs.
Compliance shall be checked by the relevant tests described in TS 26.132.
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