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CS 4457 / 9657 Computer Networks II Fall 2019

CS 4457 / 9657 Computer Networks II Fall 2019. Course Instructor: Anwar Haque Lecture 4 Oct 1 st , 2019. Dept. of Computer Sc, Western University. Network QoS & QoE. What is Network QoS / QoE Basic Quality of Service (QoS) Metrics Latency BW / Throughout Packet Loss Jitter

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CS 4457 / 9657 Computer Networks II Fall 2019

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  1. CS 4457 / 9657 Computer Networks IIFall 2019 • Course Instructor: • Anwar Haque • Lecture 4 • Oct 1st, 2019 Dept. of Computer Sc, Western University

  2. Network QoS & QoE • What is Network QoS / QoE • Basic Quality of Service (QoS) Metrics • Latency • BW / Throughout • Packet Loss • Jitter • Reliability • Application / Service Specific QoS • QoS in Best Effort Service (Residential Services) • QoS in Guaranteed Service – SLA (Business Services) • QoS Monitoring in end-to-end Networks

  3. Network QoS & QoE • QoS in best effort services • Although ISP maintains SLO, but no QoS guarantee for best effort services such as Internet, voip, iptv etc. (mainly for residential market segment) • QoS in business services • Services are guaranteed through a set of SLA (packet loss, latency, service availability) • Although best effort and business services use the same physical network infrastructures their service architecture is significantly different • Service architecture used for business uses a “priority” form of network which is absent for residential services

  4. Network QoS & QoE • QoS in Business Services • Although it is expected to meet the SLA but it may not be always guaranteed • Only way to guarantee a service is through dedicated resource reservation • User perception (QoE) & offered QoS / SLA • Lack of research in establishing the relationship between the QoS requirement and actual user experience (QoE) • QoE Metrics • Application specific • Example: VoIP Call • Echo, call drop/reconnect, connection time, call blocking rate etc. • Example: Video Streaming • Time to start the streaming, Video quality variation, Audio-video sync, buffering etc. • Example: Online Gaming • User input response time, players are not in sync, video quality

  5. Network QoS & QoE • QoS and Network Cost: ISP Perspective • Major ISPs who are committed to provide quality and reliable services make sure their network is highly reliable through resource redundancy • Providing proper QoS requires additional network resources to build a robust network which means additional capital investment for ISPs • QoS and service scope: Single ISP vs Internet • If a service doesn’t require going beyond it’s own ISP then it is relatively easier to manage and guarantee QoS to some extent • Bigger QoS challenge - when a service require multi ISP environment • Usually most of the business services stays within a single ISP • Inter ISP agreement is essential for providing proper QoS where a service spans over multi-ISPs

  6. Network QoS & QoE • Proactive QoS monitoring • A much desired tool for any ISP which can provide many strategic benefits • This will allow operations team to proactively fixes customer`s technical problems in an automated framework

  7. Network QoS /QoE (Project Topics) • To be discussed in the class

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