RCBR: a simple and efficient service for multiple time-scale traffic
IEEE/ACM Transactions on Networking (TON)
Distributed fair scheduling in a wireless LAN
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
A capacity analysis for the IEEE 802.11 MAC protocol
Wireless Networks
Asynchronous Multimedia Multihop Wireless Networks
INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
Assessing the quality of voice communications over internet backbones
IEEE/ACM Transactions on Networking (TON)
The changing usage of a mature campus-wide wireless network
Proceedings of the 10th annual international conference on Mobile computing and networking
A scalable model for channel access protocols in multihop ad hoc networks
Proceedings of the 10th annual international conference on Mobile computing and networking
Proceedings of the 2nd ACM international workshop on Wireless mobile applications and services on WLAN hotspots
Determining Intra-Flow Contention along Multihop Paths in Wireless Networks
BROADNETS '04 Proceedings of the First International Conference on Broadband Networks
An overlay MAC layer for 802.11 networks
Proceedings of the 3rd international conference on Mobile systems, applications, and services
An experimental study of multimedia traffic performance in mesh networks
WiTMeMo '05 Papers presented at the 2005 workshop on Wireless traffic measurements and modeling
Z-MAC: a hybrid MAC for wireless sensor networks
Proceedings of the 3rd international conference on Embedded networked sensor systems
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
Self-synchronizing properties of CSMA wireless multi-hop networks
Proceedings of the ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Networking at 60 GHz: the emergence of multigigabit wireless
COMSNETS'10 Proceedings of the 2nd international conference on COMmunication systems and NETworks
Distributed coordination with deaf neighbors: efficient medium access for 60 GHz mesh networks
INFOCOM'10 Proceedings of the 29th conference on Information communications
Quality of Service in mobile ad hoc networks: a survey
International Journal of Ad Hoc and Ubiquitous Computing
Supporting demanding wireless applications with frequency-agile radios
NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
A sync-less time-divided MAC protocol for mobile ad-hoc networks
MILCOM'09 Proceedings of the 28th IEEE conference on Military communications
Cross-layer opportunistic adaptation for voice over ad hoc networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
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We propose a novel approach to QoS for real-time traffic over wireless mesh networks, in which application layer characteristics are exploited or shaped in the design of medium access control. Specifically, we consider the problem of efficiently supporting a mix of Voice over IP (VoIP) and delay-insensitive traffic, assuming a narrowband physical layer with CSMA/CA capabilities. The VoIP call carrying capacity of wireless mesh networks based on classical CSMA/CA (e.g., the IEEE 802.11 standard) is low compared to the raw available bandwidth, due to lack of bandwidth and delay guarantees. Time Division Multiplexing (TDM) could potentially provide such guarantees, but it requires fine-grained network-wide synchronization and scheduling, which are difficult to implement. In this paper, we introduce Sticky CSMA/CA, a new medium access mechanism that provides TDM-like performance to real-time flows without requiring explicit synchronization. We exploit the natural periodicity of VoIP flows to obtain implicit synchronization and multiplexing gains. Nodes monitor the medium using the standard CSMA/CA mechanism, except that they remember the recent history of activity in the medium. A newly arriving VoIP flow uses this information to grab the medium at the first available opportunity, and then sticks to a periodic schedule, providing delay and bandwidth guarantees. Delay-insensitive traffic fills the gaps left by the real-time flows using novel contention mechanisms to ensure efficient use of the leftover bandwidth. Large gains over IEEE 802.11 networks are demonstrated in terms of increased voice call carrying capacity (more than 100% in some cases). We briefly discuss extensions of these ideas to a broader class of real-time applications, in which artificially imposing periodicity (or some other form of regularity) at the application layer can lead to significant enhancements of QoS due to improved medium access.