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Content for TR 26.989 Word version: 18.0.0

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4 Reference Model p. 7

5 Key Issues for Supporting MCPTT p. 8

5.1 Key Issue#1: Codec for MCPTT p. 8

5.1.1 Review of Codec Alternatives and their Relative Perceptual Performance p. 8

5.1.1.1 Overview of the 3GPP Codec Comparison p. 8

5.1.1.2 Narrowband Comparison vs AMR p. 8

5.1.1.3 Wideband Comparison vs AMR-WB p. 12

5.1.1.4 Super-wideband EVS and Relationships to Other Bandwidths p. 16

5.1.1.5 Comparison of the 3GPP Codecs to TETRA p. 17

5.1.1.6 Comparison of Performance over MCPTT Bearers p. 20

5.1.1.6.1 "HD-Voice" AMR-WB performance over 3GPP networks p. 20

5.1.1.6.2 MCPTT Bearers p. 21

5.1.1.6.3 AMR-WB and EVS Performance over the MCPTT Bearers p. 23

5.1.1.6.3.1 EVS Speech Quality p. 23

5.1.1.6.3.2 Unicast bearer p. 28

5.1.1.6.3.3 MBMS bearer p. 28

5.1.1.6.3.4 LTE-D bearer p. 31

5.1.1.6.4 Conclusions p. 37

5.1.1.7 Listening effort evaluation of AMR-WB and EVS under impaired channels p. 38

5.1.1.7.1 Test setup p. 38

5.1.1.7.2 Test results p. 38

5.1.2 Review of the Codec Alternatives and their Relative Speech Intelligibility in Clean and Low SNRs p. 41

5.1.2.1 Speech Intelligibility p. 41

5.1.2.1.1 MCPTT bearers - speech intelligibility p. 48

5.1.2.1.2 Conclusions p. 53

5.1.3 Review of Codec Alternatives and their Relative Complexity p. 54

5.1.4 Recommended requirements p. 55

5.1.5 GAP Analysis and Evaluation p. 56

5.1.5.1 Requirements on Audio/Voice Quality p. 56

5.1.5.2 Discrete/Ambient Listening and Remotely Initiated Monitoring p. 56

5.1.5.3 Noise Reduction p. 56

5.1.5.4 Common Codec Constraints of MCPTT p. 56

5.1.5.5 Requirements on Transcoding Functions in the Network p. 57

5.1.6 Criteria with respect to MCPTT codec selection p. 58

5.1.7 Solution p. 59

5.2 Key Issue#2: User Experience p. 59

5.2.1 Description p. 59

5.2.2 Recommended requirements p. 59

5.2.3 GAP Analysis and Evaluation p. 59

5.2.3.1 Longer e2e delay over BC bearer issue p. 59

5.2.3.2 Mobility issue p. 60

5.2.3.2.1 BC handoff to UC p. 60

5.2.3.2.2 UC handoff to BC p. 61

5.2.4 Assumptions p. 61

5.2.5 Solution p. 61

5.2.5.1 Transport delay difference adjustment p. 61

5.2.5.2 RTP payload treatment p. 61

5.3 Key Issue#3: MCPTT over MBMS support p. 62

5.3.1 Description p. 62

5.3.2 Deployment Considerations p. 64

5.3.3 Realization (Stage 3) Considerations (On-Network) p. 64

5.3.4 Media Handling p. 64

5.3.5 QoE for MCPTT over MBMS p. 65

5.3.5.1 QoE for both MNO and MCPTT service provider p. 65

5.3.6 eNB Scheduling on the MBMS Bearer p. 65

5.3.7 Needed information to describe an MCPTT User Plane p. 65

6 Conclusion p. 65

A Simulation Models and Parameters p. 67

A.1 MBMS Bearer Simulation Model p. 67

A.1.1 Coverage p. 67

A.1.2 Error Traces p. 68

A.1.3 eNB Scheduling p. 71

A.2 Correlation between Subjective MOS and P.OLQA p. 72

$ Change history p. 73