VoIP over Wireless

Acknowledgements:

Outline

PTT over GPRS
- Simulation Modeling and Analysis

Overview: Push to Talk (PTT)

Push-to-Talk between Alice and Bob

PTT over GPRS, initial call setup

PTT over GPRS, subsequent PTT

Performance and Capacity

Features of the GENeSyS System Simulator

GENeSyS Schematic Layout

GPRS Adaptive Coding Schemes
Throughput per slot vs C/I

Simulation Configuration

Impact of Increasing Number of Dedicated Slots
1 Uplink timeslot mode, coding scheme 1-2, dedicated timeslot 1 to 6

Impact of mobile station capability
1 Uplink timeslot mode Vs. 2 Uplink timeslot mode

Impact of mobile station capability
1 Uplink timeslot mode Vs. 2 Uplink timeslot mode

Impact of CS3/4

Changing Vocoder and Packetization

Performance Impact Study

VoIP over Broadband Wireless

Evolution of Broadband Access Technology : Air-Interface

Slide 22

3GPP2 HRPD-A VoIP Performance

Slide 24

Slide 25

VoIP Delay Components (2-Frame Bundling)

HRPD Channel Structure

Forward Channel Structure

Forward Channel Structure

Forward Channel Structure

Slot Structure of Forward Channel

HRPD-0 Reverse Link

Physical Layer Enhancements in HRPD-A

System Simulation Assumption: Forward Link

System Simulation Assumption : Reverse Link

System Simulation Parameters

Reverse Link Delay:
2 Frame Bundling, Ped-A+Ped-B+Veh-A, RF Delay only (Maximum allowable pathloss = 130 dB)

Reverse Link Delay:
2 Frame Bundling, Ped-A+Ped-B+Veh-A, RF Delay only (Max allowable pathloss = 160dB)

Reverse Link Delay:
No Frame Bundling, Ped-A+Ped-B+Veh-A, RF Delay only (Maximum allowable pathloss = 160 dB)

Reverse Link Delay:
6 bytes overhead, Ped-A+Ped-B+Veh-A, RF Delay only (Maximum allowable pathloss = 130 dB)

Reverse Link Delay:
6 bytes overhead, Ped A+Ped-B+Veh-A, 1/8 rate frames included

Forward Link Delay:
2 Frame Bundling, Ped A+Ped-B+Veh-A, RF Delay only, w/ MAC Mux

Forward Link Delay:
6 bytes overhead, Ped A+Ped-B+Veh-A, 1/8 rate frames suppression, w/ MAC Mux

Forward Link Delay:
6 bytes overhead, Ped A+Ped-B+Veh-A, 1/8 rate frames included, w/ MAC Mux

VoIP over HRPD-A Capacity:  Conclusions

3GPP HSDPA/HSUPA VoIP Performance

"High Speed Downlink Packet Access"

Slide 48

"HS-PDSCH Physical Channel Fundamentals"

HSUPA Concept à lower delay & higher capacity

E-DCH Physical Channel Structure

Physical Layer Features for HSDPA/EUL:  VoIP

VoIP Delay Components

Vocoder Modeling

DL/UL VoIP Simulation Parameters

VoIP RF Capacity for DL (HSDPA): 2 Frame Bundling

VoIP RF Capacity for DL (HSDPA): No Bundling

VoIP RF Capacity for UL (EUL) : 2 Frame Bundling

VoIP RF Capacity for UL (EUL) : No Bundling

3GPP VoIP RF Capacity: Conclusions

802.16e VoIP Performance

Emerging 802.16 Standards

Scope of 802.16d&e Specifications

802.16e OFDMA Key Attributes

OFDM DL Waveform Requirements

802.16e Scalable Channel Bandwidths and Duplexing

802.16 OFDMA Frequency Re-Use

Typical 802.16d/e TDD Frame Structure

Peak Data Rate Summary : Example

VoIP characteristics and requirements

System Simulation Parameters ( 802.16e – DL)

System Simulation Parameters ( 802.16e – UL)

Scheduling and resource allocation

VoIP Performance (5 MHz, 50/50 DL/UL Split, FER<1%)

Slide 75

VoIP Performance (5 MHz, 50/50 DL/UL Split, FER<2%)

802.16e VoIP Delay Components

802.16e VoIP RF Capacity: Conclusions

Summary of VoIP Performance over Broadband Wireless

Slide 80