VoIP over a wired link
Acknowledgements
Outline
Packet Radio Access Network
The Backhaul Link
Packetized Voice in
Cellular Telephony
Queueing Model
The Protocol Stack
Aggregated Voice Traffic
General arrival process for
aggregated voice traffic with random offsets
Arrival Process of
Aggregated Voice Traffic: Offset Groups
Voice Sources
Simulation Results
(157 users over a T1 at 1.536 MbpS)
Effect of Loading
number of sessions
Effect of Correlation
one-step correlation shown
Gaussian Traffic Model
Gaussian Traffic Model
Queue Length
Queue Length Approximation
Queue Length Approximation
Scaling Factor
The Variance of A(t)
The Variance of A(t)
The Large Deviations
Approximation
(157 users over 1.536 Mbps)
Why the hockeystick?
Intuition
Validation
Heavy Traffic Analysis
Heavy Traffic Analysis
Heavy Traffic Analysis
Stationary Density
Waiting Time Approximation
Validation
(157 users over 1.536 Mbps)
Validation
Slide 35
Ongoing work
Slide 37
Packetized Voice in
Cellular Telephony
(numerical example: EVRC)
Correlation Structure of
Vocoder Output
Voice Arrival Process
Traffic Shaping