1. WIRELESS QUALITY OF
SERVICES
UTKARSH.V.SHARMA
MBA Tech (Telecom) 528

2. BUT I SAY IT AS…
 Quality of Experience…
 Factors affecting QOE…
 Delay
 Jitter
 Drop

3. DELAY & JITTER
t Original Signal
t Delay
t Jitter

4. DROP
 One or more packets of data travelling
across a computer network fail to reach their
destination
Packet drop
Destinatio
source
n
Network medium

5. TYPES OF SERVICES
 Data
 Voice
 Video
 [Presentation flow here on will be analysis of
the effects of QOE factors on the services]

6. 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

7. VOICE- A REAL TIME SERVICE
Effect 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.

8. 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

9. VIDEO – A REAL TIME SERVICE
I- 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

10. THUS WE NOTICED THAT:
 DATA  Best effort service
 VOICE Delay sensitive service
 VIDEO Drop sensitive service.

11. QUALITY OF SERVICE

12. 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.

13. QOS EXAMPLE.
 This intelligent network is the IP Network.
2MB
 QOS
 Classified incoming info packets.
 Prioritize the packets.
1 voice 2video 3Data.

14. THANK YOU