Quality of Service

Assume perceived quality Q, scales with throughput T, as Q~Q0log(T/TC)

Critical sustained throughput TC, for acceptable quality of service

Perceived visual quality saturates for T above TC~1Gb/s=24x1280x1029x30 b/s

Acceptable service only when T>TC

Perceived audio quality also saturates but at lower sustained throughput

Q~Q0log(T/TC)

Quality threshold Q

c

at sustained throughput T

c

Sustained throughput, T (Gb/s)

0

-1

-2

1

2

5

6

7

8

9

4

3

2

1

0

10

-3

3

Perceived quality of service, Q/Q0

Acceptable

Unacceptable

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