Research Article

Towards Internet QoS Provisioning Based on Generic Distributed QoS Adaptive Routing Engine

Table 2

DSCP Assignation for Internet traffic.

Service Group Service Category Major
Service
classes
Flow
C/Cs
QoS Metrics DSCP Value Traffic classMinor Service classes
TimelinessB.WReliability
RT
(sec)
Delay
(ms)
Jitter
(ms)

Best EffortDefaultUnclassifiedUUUUU000000CS0-DefaultEverything else
User
oriented
Data orientedLow prioritySymmetric1 sec<200N/AElasticZero Loss001000CS1Internet Chat
Interactive(i) short lived 
(ii) Low Latency 
(iii) Asymmetric
2–5250–400N/AElasticZero Loss010010 
010100 
010110
AF23 
AF22 
AF21
Telnet
Web Browsing
Enhanced Web
Bulk Transfer(i) long-lived 
(ii) High Throughput 
(iii) Asymmetric
2–5Low-MediumN/AElasticZero Loss001010 
001100 
001110
AF11 
AF12 
AF13
E-Mail
FTP
Billing transfer
Media oriented
 Tolerant
 Real Time
 Symmetric
Multimedia
Conferencing
(i) interactive 
(ii) group communication 
(iii) Rate adaptive
Rate adaptive<150<4008 kbps–1 MbpsVery low loss100110 
100100 
100010
AF43 
AF42 
AF41
Audio
Audio graphics
video
Telephony
Service
CBR, fixed small packets,
Interactive and fast response
<150<100<4008 kbps–1 MbpsVery low loss101110 
101100
EF 
EF
VOIP
Videophony
 Intolerant
 Real Time
 Symmetric
Broadcasting(i) Inelastic 
(ii) CBR and VBR
2–5<15050–10056 K–40 Mlow loss011010 
011100
AF31 
AF32
Broadcast Video
Broadcast Audio
Streaming(i) Elastic 
(ii) Variable packet size
2–5<150<10064 k–60 Mlow loss011000CS3Streaming media
Interactive(i) Inelastic 
(ii) VBR
2–5<150<10064 k–60 Mlow loss100000CS4VoD

Network orientedNetwork ControlRouting and control informationInelastic-Short messagesN/A1–10 sN/AElasticZero Loss110000CS6Routing information
Operation and Management signalingOAMInelastic-Short messagesN/A50–100N/AElasticZero Loss010000CS2OAM
Application ControlSignaling Service ClassInelastic-Short messagesN/A50–100N/AElasticZero Loss101000CS5VOIP Signaling