WIRELESS QUALITY OF SERVICES UTKARSH.V.SHARMA MBA Tech (Telecom) 528
BUT I SAY IT AS… Quality of Experience… Factors affecting QOE… Delay Jitter Drop
DELAY & JITTER t Original Signal t Delay t Jitter
DROP One or more packets of data travelling across a computer network fail to reach their destination Packet drop Destinatio source n Network medium
TYPES OF SERVICES Data Voice Video [Presentation flow here on will be analysis of the effects of QOE factors on the services]
DATA SERVICES Something which is stored is data Sender Receiver 1 2 ... n n+1 Delay Retransmission as timer might expire Drop Retransmission Thus Data service = BEST EFFORT SERVICE
VOICE- A REAL TIME SERVICEEffect of Drop on voice: No effect because of Voice concealment program (VCP) running on receiver side.R R A A M M R A A M M RRAAMM or RAAAMM Thus Voice is NOT DROP SENSITIVE SERVICE Drops allowed = 1 in 10000 packets.
EFFECT OF DELAY ON VOICE 1sec 3sec t Hhheellloo hello (easily interpretable) 1sec 3Sec t Hhhhhhhheeeeeellllllllllllllloooooooooo Hello (Difficult to understand) Hampers QOE Thus Voice = DELAY SENSITIVE SERVICE
VIDEO – A REAL TIME SERVICEI- Frame P- B - Frame I - Frame Frame 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
THUS WE NOTICED THAT: DATA Best effort service VOICE Delay sensitive service VIDEO Drop sensitive service.
QOS The ability of a network to:- Classify Incoming information packets as voice, video or data. Prioritize Theforwarding of the classified packets as per their sensitivity.Is what exactly is known as QUALITY OF SERVICE.• IP Network employees QOS easily.
QOS EXAMPLE. This intelligent network is the IP Network. 2MB QOS Classified incoming info packets. Prioritize the packets. 1 voice 2video 3Data.