QoS in the Next Generation Networks

QoS in the Next Generation NetworksPascal LORENZlorenz@ieee.orgPascal LORENZQuality of Service• QoS for a network: different parameters such as bandwidth, latency, jitter, packet loss, packet delay• for video applications: QoS is based on the bandwidth• for VoIP: QoS is based on latency (end to end delay not larger than 200 ms)• =>optimize delay, bandwidth, packet loss… but not allPascal LORENZ• CoS (Classes of Service) classify the services in different classes.• CoS manage each type of traffic with a particular way• ETSI (European Telecommunications Standards Institute has introduced 4 CoS(Classe 1 : Best Effort, Classe 4: QoSguaranteed)• QoE (Quality of Experience): subjective measure of a customer's for a suppliedservice • Many SLA offers 3 CoS: Premium (max 15% of network resources), Olympic (max 80% of network resources) and BEPascal LORENZ1• QoS can be linked to the– network level: QoS depend of the network policy. Mechanisms such as filters, rerouting in the core of the network and control access at the corners of the network. Intelligence in the routers. (OSPF, RIP, SNMP, BGP)– application level: applications which improve the QoS. No link with the network infrastructure. (NFS, …)Pascal LORENZ• Signaling at the application level: SIP, H323• Signaling at the network level: COPS, RSVPPascal LORENZ• Internet is increasing exponentially:– 2001: 180 million users– today: more than 1,2 billions users• Internet ...