Voice over IP performance monitoring
ACM SIGCOMM Computer Communication Review
Packetized voice transmission using RT-MAC, a wireless real-time medium access control protocol
ACM SIGMOBILE Mobile Computing and Communications Review
Improving the latency of 802.11 hand-offs using neighbor graphs
Proceedings of the 2nd international conference on Mobile systems, applications, and services
Fast handoff for seamless wireless mesh networks
Proceedings of the 4th international conference on Mobile systems, applications and services
Using smart triggers for improved user performance in 802.11 wireless networks
Proceedings of the 4th international conference on Mobile systems, applications and services
The need for cross-layer information in access point selection algorithms
Proceedings of the 6th ACM SIGCOMM conference on Internet measurement
IEEE/ACM Transactions on Networking (TON)
Estimation of link interference in static multi-hop wireless networks
IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
Designing high performance enterprise Wi-Fi networks
NSDI'08 Proceedings of the 5th USENIX Symposium on Networked Systems Design and Implementation
Interactive wifi connectivity for moving vehicles
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Online estimation of RF interference
CoNEXT '08 Proceedings of the 2008 ACM CoNEXT Conference
Softspeak: making VoIP play well in existing 802.11 deployments
NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
CENTAUR: realizing the full potential of centralized wlans through a hybrid data path
Proceedings of the 15th annual international conference on Mobile computing and networking
On the effectiveness of IEEE 802.11e implementations in real hardware
ISWCS'09 Proceedings of the 6th international conference on Symposium on Wireless Communication Systems
Dyson: an architecture for extensible wireless LANs
USENIXATC'10 Proceedings of the 2010 USENIX conference on USENIX annual technical conference
DOMINO: relative scheduling in enterprise wireless LANs
Proceedings of the ninth ACM conference on Emerging networking experiments and technologies
| Hi-index | 0.00 |
We consider the problem of providing mobility support for Voice-over-IP (VoIP) traffic in small-scale enterprises. There is considerable interest in providing on-the-go support for VoIP through the use of WiFi-enabled smart phones. However, existing solutions either do not support client mobility or require client modifications, making them difficult to deploy in practice. In this paper, we present OmniVoice, an 802.11 compliant solution that supports mobility for VoIP traffic without any client modifications. To effectively support such traffic, OmniVoice eliminates client handoff delays and manages interference from non-VoIP background traffic. It achieves this by using (a) a single-channel WLAN design and (b) a lightweight central controller for scheduling non-interfering AP-to-client transmissions and dynamically associating clients. The controller minimizes interference with the help of an interference map that models potential exposed and hidden terminal conflicts in the WLAN, while allowing for the serialization of transmissions that would otherwise compete for medium access. We have implemented and extensively evaluated OmniVoice on a 40 node wireless testbed. OmniVoice meets the QoS requirements for VoIP in all operating scenarios and is unaffected by interference from non-VoIP traffic. In particular, OmniVoice provides 100% greater throughput and 130% greater uninterrupted connectivity time to mobile VoIP users as compared to an off-the-shelf 802.11 solution.