VoIP over Wireless LANs Sangho Shin Ph.D. Candidate Department of Computer Science Columbia University.

Slides:



Advertisements
Similar presentations
Fast L3 Handoff in Wireless LANs Andrea G. Forte Sangho Shin Henning Schulzrinne.
Advertisements

Stony Brook Mesh Router: Architecting a Multi-Radio Multihop Wireless LAN Samir R. Das (Joint work with Vishnu Navda, Mahesh Marina and Anand Kashyap)
College of Engineering Optimal Access Point Selection and Channel Assignment in IEEE Networks Sangtae Park Advisor: Dr. Robert Akl Department of.
CUBS: Coordinated Upload Bandwidth Sharing in Residential Networks Enhua Tan 1, Lei Guo 2, Songqing Chen 3, Xiaodong Zhang 1 1 The Ohio State University.
Wireless Design for Voice Last Update Copyright 2011 Kenneth M. Chipps Ph.D.
Emerging Technologies in Wireless LANs. Replacement for traditional Ethernet LANs Several Municipalities Portland, OR Philadelphia, PA San Francisco,
Experimental Measurement of VoIP Capacity in IEEE WLANs Sangho Shin Henning Schulzrinne Department of Computer Science Columbia University.
1 Towards the Quality of Service for VoIP Traffic in IEEE Wireless Networks Sangho Shin PhD candidate Computer Science Columbia University.
Cooperation Between Stations in Wireless Networks Andrea G. Forte and Henning Schulzrinne Department of Computer Science Columbia University, New York.
1 Solutions to Performance Problems in VOIP over Wireless LAN Wei Wang, Soung C. Liew Presented By Syed Zaidi.
January 2008 VoIP in Wireless Networks Henning Schulzrinne Andrea G. Forte, Sangho Shin Department of Computer Science Columbia University.
VoIP over Wireless LANs Sangho Shin. IP Why VoIP? Voice Personalized Service Location-based Service Emergency Service IP Voice Service.
IEEE in the Large: Observations at the IETF Meeting Henning Schulzrinne, Andrea G. Forte, Sangho Shin Department of Computer Science Columbia University.
VoIP over Wireless LANs Sangho Shin Ph.D. Candidate Department of Computer Science Columbia University.
Internet GIS and Wireless Mobile GIS for Disaster Management by Dr. Ming-Hsiang (Ming) Tsou Phone:
Fast Wireless Handoff in Networks Sangho Shin Andrea G. Forte Anshuman S. Rawat Henning Schulzrinne.
November 2008 VoIP in Wireless Networks Henning Schulzrinne Andrea G. Forte, Sangho Shin Department of Computer Science Columbia University.
Handoff Delay for b Wireless LANs Masters Project defense Anshul Jain Committee: Dr. Henning Schulzrinne, Columbia University Dr. Zongming Fei, University.
Experimental Measurement of the Capacity for VoIP Traffic in IEEE WLANs Authors : Sangho Shin, Henning Schulzrinne [INFOCOM 2007] Reporter : 林緯彥.
VoIP over Wireless Networks Router Access Point (AP) AP INTERNET.
750Mbps ac Wireless Broadband Router WDRT-750AC.
October 10-13, 2006 San Diego Convention Center, San Diego California Introduction to WiFi Telephony Thursday - 10/12/06, 8:30-9:15am David.
Performance of Voice over Networks
Voice Traffic Performance over Wireless LAN using the Point Coordination Function Wei Supervisor: Prof. Sven-Gustav Häggman Instructor: Researcher Michael.
College of Engineering Resource Management in Wireless Networks Anurag Arepally Major Adviser : Dr. Robert Akl Department of Computer Science and Engineering.
VoIP Packets In the Air and Over the Wire J. Scott Haugdahl CTO
2 ADVANTAGE OF BUS TOPOLOGY Cheap and Easy, Having only one main cable connecting all of the stations together drastically reduces the time and the cost.
Samrat Ganguly et al. IEEE JSAC’06 November 2006 Yoonchan Choi Advanced Networking Lab Oct 9,
VoFi standards & deployment models Thenu Kittappa.
© 2012 Aerohive Networks CONFIDENTIAL Devin Akin Chief Wi-Fi Architect High-Density Wi-Fi Design Tips and Tricks.
Towards Programmable Enterprise WLANs With Odin
Handoff in IEEE Andrea G. Forte Sangho Shin Prof. Henning Schulzrinne.
Wireless Access avoid collisions: 2 + nodes transmitting at same time CSMA - sense before transmitting –don’t collide with ongoing transmission by other.
Voice Capacity analysis over Introducing VoIP and WLans IEEE based Wireless Local Area Networks (WLANs) are becoming popular While WLANs.
Call Admission Control in IEEE Wireless Networks using QP-CAT Sangho Shin Henning Schulzrinne Department of Computer Science Columbia University.
Passive DAD Henning Schulzrinne Columbia University.
WME ABC ’ s LayerDescription aPHY 54 Mb/s in 5 GHz bands bPHY 11 Mb/s direct sequence in 2.4 GHz band cMAC Bridging operation dPHY International.
VoIP over Wireless LANs Sangho Shin. Outline Why VoIP ? Why ? My research Applicability.
October 4-7, 2004 Los Angeles, CA VoWLAN Trends and Opportunities Kamal Anand Vice President Marketing Meru Networks
12/13/2006 Improving Quality of Service for VoIP Traffic in IEEE Wireless Networks Sangho Shin Henning Schulzrinne.
VoIP in Wireless Networks Henning Schulzrinne with Andrea G. Forte, Sangho Shin Department of Computer Science Columbia University ComSoc DLT June.
An Empirical Analysis of the IEEE MAC Layer Handoff Process Arunesh Mishra Minho Shin William Arbaugh University of Maryland,College Park,MD.
Enterprise-Class Telephony on Wireless LANs Tom Alexander CTO VeriWave, Inc.
© Sarvesh 25 November 2015Cross-layer optimization for VoIP over WLAN125 November Cross Layer optimization for VoIP over WLAN [Yuan Liu Zhu] A Presentation.
Performance Management of WLANs Simulation of WLAN Manager (WM) Fairness issues related to multi-rate WLAN environment Policy based Service differentiation.
Mobile Multimedia and VoIP Prof. Henning Schulzrinne Andrea Forte · Matthew Mintz-Habib · Takehiro Kawata · Jonathan Lennox · Anshuman Rawat · Ron Shacham.
How Bad Are The Rogues’ Impact on Enterprise Network Performance ? Kaixin Sui, Dan Pei, Youjian Zhao, Zimu Li Tsinghua University.
Cooperation between stations in wireless networks Andrea G. Forte, Henning Schulzrinne Department of Computer Science, Columbia University Presented by:
Quality of Service Schemes for IEEE Wireless LANs-An Evaluation 主講人 : 黃政偉.
October 17, 2007 Cooperation Between Stations in Wireless Networks Andrea G. Forte Henning Schulzrinne Department of Computer Science Columbia University.
Passive Duplicate Address Detection (DAD) Sangho Shin Andrea Forte Henning Schulzrinne Columbia University.
PAC: Perceptive Admission Control for Mobile Wireless Networks Ian D. Chakeres Elizabeth M. Belding-Royer.
1 An Empirical Analysis of the IEEE MAC Layer Handoff Process Arunesh Mishra Minho Shin William Arbaugh University of Maryland College Park,MD,USA.
Wired and Wireless network management 1. outline 2 Wireless applications Wireless LAN Wireless LAN transmission medium WLAN modes WLAN design consideration.
S305 – Network Infrastructure Chapter 6 Local Area Network.
Andrea G. Forte Sangho Shin Henning Schulzrinne
BoulderPhone.com.
Department of Computer Science University of Calgary
Balancing Uplink and Downlink Delay of VoIP Traffic in WLANs
Fast MAC Layer Handoff in Networks
The Network Beacon Announcement scanning method
Department of Computer Science University of Calgary
IEEE in the Large: Observations at the IETF Meeting
Chapter 1: Introduction
Using Dynamic PCF to improve the capacity of VoIP traffic in IEEE 802
Terry Gray Networks & Distributed Computing 19 March 2002
VoIP in IEEE Networks Henning Schulzrinne
Wireless and TCP: Performance Issues
Cooperation Between Stations in Wireless Networks
Wireless and TCP: Performance Issues
Presentation transcript:

VoIP over Wireless LANs Sangho Shin Ph.D. Candidate Department of Computer Science Columbia University

Why VoIP? Personalized Service Location-based Service Emergency Service IP Voice Service

Why ? Unlicensed channels Easy to install High speed Widely deployed Cheap

VoIP over WLANs PBX Internet WIFI AP (Access Point)

QoS of VoIP in Wireless LANs Handoff Capacity Call Admission Control QoS

Handoff Handoff Time 500 ms ~ 1 s 4 ms ~ 100 ms Selective Scanning & Caching Layer 2 (MAC layer) Handoff

GHz2.468 GHz 22 MHz ► Selective Scanning ► Caching  Locality  Store the scanned AP information to a cache Layer 2 Handoff b channels Only clients (driver) need to be modified!

Handoff Handoff Time 1 min 20 ms ~ 300 ms Fast L3 Handoff Passive DAD Layer 3 (IP layer) Handoff

Layer 3 Handoff ► Fast L3 Handoff (Client side)  Fast subnet discovery using a DHCP query  Scan unused IPs in a new subnet ► Passive DAD (Server side) V V V V Request Response Monitor Collect IPs Update IP list Fast Response

Capacity Theater Stadium More simultaneous calls Low VoIP capacity in WLANs Low bandwidth Low utilization of VoIP traffic

Capacity MAC PCFDCF DPCF APC VoIP Capacity 25%~30% Reduce polling overhead Fair resource distribution

Call Admission Control (CAC) WIFI QoS

Call Admission Control (CAC) WIFI QoS CAC

Call Admission Control (CAC) CAC QoSUtilization 90% 80%

CAC with QP-CAT QoSUtilization Call Admission Control (CAC) CAC QoSUtilization 90% 80% 100%98%

QP-CAT ? QoS Delay Predicted delay with QP-CAT Queue size Prediction (QP) Computation of Additional Transmission (CAT) MAC

Experiments NJ Rutgers University

Capacity for VoIP traffic in WLANs Experiments DPCF APCQP-CAT

Thank you !

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.