Playout Controller QoS at the IP Edge Points For networks with packet loss and jitter Henrik Åström GLOBAL IP SOUND

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1 Playout Controller QoS at the IP Edge Points For networks with packet loss and jitter Henrik Åström GLOBAL IP SOUND Speech Processing, Transmission and Quality Aspects (STQ) Workshop Feb 2003

2 Outline VoIP Quality Issues Traditional Algorithms NetEQ Playout Controller Speech Quality Delay Total Quality (with E-model) Conclusion

3 VoIP and Quality VoIP - flexibility, cost savings and new features Quality issues - delay, jitter, packet loss, clock drift Efficient algorithms - ensure the speech quality in VoIP Overprovisioning and tight network management expensive and inflexible Edge point Playout Controller Solution to lots of the Problems

4 Delay & Packet Loss Sources Processing <60ms Packetization <60ms Serialization 0-40ms End device ms IP Network Jitter buffer Processing End device ms 200ms 0-5ms ms Packet Loss LAN Access Core Access LAN Clock drift WLAN Modem Ethernet 2-200ms200ms 0-40ms ~0ms Serialization 0-40ms - FrameRelay 0-200ms Propagation 5ms/1000km - Intercont ms - Satellite ms - Cable 25ms/5000km - Fiber 3ms/1000km Queuing 0-100ms WLAN..ms Modem..ms Ethernet ~0ms Serialization..ms Propagation..ms Queuing..ms To other Networks To PSTN ms 100ms To Mobile ms The packets can be lost due to queing effects at the access points and in the routers. Packet loss also occurs when there are bit errors during the transmission (mostly for WLAN and satellite transmissions)

5 Traditional Jitter Buffer & PLC Approach Traditionally - Jitter Buffer and PLC, two separate units Jitter Buffer Fixed simple, high delay, not flexible Adaptive lower delay, each adaptation gives distortions Packet Loss Concealment Zero Stuffing bad quality Packet Repetition up to 2-3% packet loss G.711 Appendix I better quality Built-in PLC codec dependent Speech Speech decoder decoder Receive In ( ) Jitter Jitter buffer buffer Error Error concealment concealment Play Out ( )

6 NetEQ Approach Playout Controller - Combined Delay Adaptation and PLC Integrated Design - Cooptimizations Signal Processing techniques enables good quality Better performance, Delay and Packet Loss Concealment Works with any speech codec Speech Speech decoder decoder Packet from IP network packet packet buffer buffer Jitter Jitter control control & Error Error concealment concealment Play Out Adapt Adapt Delay Delay Switch Switch Normal Normal PLC PLC

7 NetEQ vs Traditional Methods Traditional Algorithms NetEQ Playout Controller 1. Packet level Operation on Decoded Speech (10-60 ms) Resolution (1-2 ms) 2. Delay Modified by Signal Processing to Adding/Dropping Packets Increase/Decrease Delay 3. Error Concealment Error Concealment on Speech/Audio on Packets 4. Clock Drift/Skew can cause Delay and Quality Problems Automatic and Instant Adjustment to Clock Drift/Skew

8 Voice Quality During Packet Loss Results of Listening Test at COMSAT

9 Voice Quality During Packet Loss Results of Listening Test at COMSAT

10 Voice Quality During Packet Loss Results of Listening Test at COMSAT

11 Delay Performance Jitter Adaptive jitter buffer Fixed jitter buffer NetEQ Delay (ms) Packet number Fixed one-way delay 80 ms. NetEQ s Delay ~150ms, Adaptive Jitter Buffer ~190 ms

12 ITU E-Model Delay also affects the quality. This is not shown in a MOS test R = Ro Is Id Ie,eff+ A

13 Delay Adjusted MOS Score The E-model + normal MOS chart give delay modified MOS NetEQ has lower delay, this keeps the total quality higher Using values from jitter chart. NetEQ has average 150 ms delay, standard adaptive jitter buffer has 190 ms delay

14 Summary Important - Low Delay and good PLC Advanced Playout Controller - Higher Quality and Better Bandwidth Utilization Demo MOS = USER EXPERIENCE Operate Operate AT AT and and ABOVE ABOVE congestion congestion point point NetEQ NetEQ FALL FALL OFF OFF A A CLIFF CLIFF forces forces overprovisioning overprovisioning - - traditional traditional technology technology OVERPROVISIONED NETWORK CONGESTED NETWORK

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