1 Introduction
2 Scope
3 Structure of the Recommendation
4 Related documents
5 Abbreviations and acronyms (see
Note 1)
6 Definitions
6.1 QoS
6.2 Speech quality
6.3 Connection performance
6.4 Service retainability performance
6.5 Reliability performance
6.6 Guidelines of design
6.7 Guidelines of management
7 Considerations
8 Recommendations
8.1 Overview of different levels of QoS
8.1.1 The end-to-end service and IMT-2000 bearer
service
8.1.2 The radio access bearer service and the CN
bearer service
8.1.3 The radio bearer service and the RANI bearer
service
8.1.4 The backbone network service
8.2 IMT-2000 QoS classes
8.2.1 Conversational class
8.2.2 Interactive class
8.2.3 Streaming class
8.2.4 Background class
8.3 Range of QoS requirements
8.3.1 Supported end user QoS
8.4 Principal speech
quality requirements
8.4.1 Subjective quality
8.4.2 Natural speech quality and speaker recognition
8.4.3 Ease of conversation
8.4.4 Loss of interactivity due to delay in the
speech path
8.4.5 Freedom from echo
8.4.6 Uniformity in different environments
8.4.7 Effects of transcoding
8.4.8 Quality of end-to-end connections
8.4.9 Terminal acoustics
8.4.10 Call progress tones, announcements and music
8.4.11 Handover
8.4.12 Robustness
8.4.13 Background acoustic noise
8.4.14 Interconnection of IMT-2000 users in different
networks
8.4.15 Speech
performance testing
Annex
1 Planning tool to assess end-to-end
voice transmission quality