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Understanding End-to-End Quality of Service in TIPHON Systems

Explore the TIPHON system's approach to characterizing multimedia QoS, including ITU standards, performance metrics, service classes, and factors influencing QoS in IP networks.

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Understanding End-to-End Quality of Service in TIPHON Systems

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  1. Characterising End to End Quality of Service in TIPHON Systems Helmut SchinkSiemens AG

  2. Approach to Characterizing Multimedia QoS • QoS is defined subjectively as perceived by the user, • It is end to end (e.g. mouth to ear for speech), • A number of QoS Service Classes are defined, • Classes include guaranteed quality (statistically) and unguaranteed (best effort).

  3. ITU-T G.109 Voice Quality Categories • ITU-T G.109 defines categories of voice quality for conventional 3.1 KHz telephony in terms of R

  4. Definition of TIPHON Speech QoS Classes • BEST: providies voice quality better than PSTN, using wideband audio (eg 7 kHz) codecs, over QoS-engineered IP networks • HIGH: provides voice quality comparable to PSTN, over QoS-engineered IP networks • MEDIUM: provides voice quality comparable to mobile telephony, over QoS-engineered IP networks • BEST EFFORT: provides usable voice quality, but not guaranteed, over non QoS-engineered IP networks

  5. TIPHON QoS Class Performance Metrics • End-to-end delay, Each TIPHON class is defined by three performance metrics • Listening Speech Quality (one-way, non conversational), • Overall Transmission Quality Rating (R)(combines codec performance and effects of network impairments into one subjective metric via G.107 Emodel )

  6. Overall Transmission Quality Rating (R) Listener Speech Quality (One-way Non-conversational) End-to-end Delay (G.114) < 100ms < 400ms* < 150ms Equivalent or better than G.726 at 32 kbit/s Equivalent or better than GSM-FR < 100ms Better than G.711 N.A. > 80 > 50* > 70 Undefined The TIPHON Speech QoS Classes Guaranteed (High) Guaranteed(Medium) Guaranteed(Best) Unguaranteed(Best Effort) Class • * Target

  7. R-value BEST HIGH MEDIUM LOW POOR 100 90 80 70 60 50 G.109 Performance Categories Relationship between TIPHON Service Classes & R Value BEST HIGH MEDIUM BEST EFFORT

  8. Parameters Determining QoS in IP Networks

  9. Factors Influencing QoS Usual factors: • Levels, echoes, delay, noise, terminal acoustics. Specific Packet Related Factors: • Delay Jitter • Packet Loss, • Codec performance.

  10. Overall Packet Loss Codec Performance Perceived Quality Jitter Buffers Overall Delay QoS Service Level Inter-relationship of QoS Factors Network Packet Loss Network Jitter Network Delay • Application Factors • Network Factors

  11. Derivation of Transport QoS Parameters QoS Service Class SERVICE Codec, Frames per Packet, Frame Size, Jitter Buffer Size, Overall Delay, Overall Packet Loss, FEC (Redundancy) APPLICATION Network Packet Loss, Mean Delay, Delay Variation TRANSPORT

  12. Extension to Multimedia QoS Classes • TIPHON VoIP requirements address this quadrantfrom a user perspective, packet loss and delay are the fundamental performance metrics for all multimedia services Interactive Responsive Timely Non-critical 5% Packet Loss Conversational voice and video Voice/video messaging Streaming audio/video Delay Fax 100 msec 1 sec 10 sec 100 sec 0% Command/ control (eg Telnet, Interactive games) Transactions (eg E-commerce, Web-browsing, E-mail access) Paging, Downloads (eg FTP, still image) Background (eg Usenet) Zero loss

  13. Further Information TR 101 329 - Part 2 TIPHON; Quality of Service (QoS) Classes TIPHON Web site http://www.etsi.fr/tiphon/ • Access to Documentation • http://docbox.etsi.org/tech-org/tiphon/Document/tiphon/07-drafts/wg5/

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