UNI Europa Services Manifesto - Quality jobs for quality services
Wireless quality of services
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Transcript of Wireless quality of services
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UTKARSH.V.SHARMAMBA Tech (Telecom) 528
WIRELESS QUALITY OF SERVICES
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BUT I SAY IT AS…
Quality of Experience…
Factors affecting QOE… Delay Jitter Drop
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DELAY & JITTER
t
t
t
Original Signal
Delay
Jitter
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DROP
One or more packets of data travelling across a computer network fail to reach their destination
sourceDestinat
ion
Network medium
Packet drop
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TYPES OF SERVICES
Data Voice Video
[Presentation flow here on will be analysis of the effects of QOE factors on the services]
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DATA SERVICES
Something which is stored is data
Delay Retransmission as timer might expire Drop Retransmission
Thus Data service = BEST EFFORT SERVICE
Sender Receiver
1 2 nn+1...
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VOICE- A REAL TIME SERVICE
Effect of Drop on voice: No effect because of Voice
concealment program (VCP) running on receiver side.
Thus Voice is NOT DROP SENSITIVE SERVICE
Drops allowed = 1 in 10000 packets.
RRAAMM or RAAAMM
R AR M MA AR M MA
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EFFECT OF DELAY ON VOICE
Thus Voice = DELAY SENSITIVE SERVICE
1sec
1sec 3sec
3Sec
Hhheellloo hello (easily interpretable)
Hhhhhhhheeeeeellllllllllllllloooooooooo Hello (Difficult to understand) Hampers QOE
t
t
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VIDEO – A REAL TIME SERVICE
If I-Frame (Max Info about frame) drops: Blank Screen. QOE Reduces
If P-Frame or B-frame (less info) drops: Screen doesn’t go blank but Glitch is noticed.
QOE Reduces.
Thus Video = DROP SENSITIVE SERVICE
I- Frame P-Frame
B - Frame I - Frame
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THUS WE NOTICED THAT:
DATA Best effort service VOICE Delay sensitive service VIDEO Drop sensitive service.
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QUALITY OF SERVICE
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QOS
The ability of a network to:- Classify
Incoming information packets as voice, video or data.
Prioritize The forwarding of the classified packets as per
their sensitivity.
Is what exactly is known as QUALITY OF SERVICE.
• IP Network employees QOS easily.
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QOS EXAMPLE. This intelligent network is the IP
Network.
QOS Classified incoming info packets. Prioritize the packets.
1 voice 2video 3Data.
Voice
64Kb
Data 700MB
Video 20MB
2MB
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THANK YOU