Distributed fair scheduling in a wireless LAN
MobiCom '00 Proceedings of the 6th annual international conference on Mobile computing and networking
A Unified Framework and Algorithm for (T/F/C)DMA Channel Assignment in Wireless Networks
INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
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
End-to-end performance and fairness in multihop wireless backhaul networks
Proceedings of the 10th annual international conference on Mobile computing and networking
An overlay MAC layer for 802.11 networks
Proceedings of the 3rd international conference on Mobile systems, applications, and services
Challenges: a radically new architecture for next generation mobile ad hoc networks
Proceedings of the 11th annual international conference on Mobile computing and networking
Design and evaluation of a new MAC protocol for long-distance 802.11 mesh networks
Proceedings of the 11th annual international conference on Mobile computing and networking
A survey of practical issues in underwater networks
WUWNet '06 Proceedings of the 1st ACM international workshop on Underwater networks
WiLdnet: design and implementation of high performancewifi based long distance networks
NSDI'07 Proceedings of the 4th USENIX conference on Networked systems design & implementation
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Approaches to Medium Access Control (MAC) in mobile ad hoc networks (MANETs) can be broadly classified into TDMA and CSMA/CA. In principle, TDMA offers superior performance as well as better capacity guarantees compared to CSMA/CA. In practice, however, the need to provide network-wide synchronization without centralized control, and to accommodate mobility makes TDMA very hard to design and implement. Consequently, CSMA/CA variants are generally preferred. While the proliferation of real-time multimedia applications demands a protocol with TDMA-like features, the problem of doing so in a practically viable manner remains unsolved. We present SITA (Sync-less Impromptu Time-Divided Access), a MAC protocol for real-time applications over MANETs. SITA combines the advantages of TDMA with the simplicity and robustness of CSMA/CA. SITA provides on (traffic) demand, reserved access to the channel and automatic admission control, while it does not require slot synchronization. The main idea behind SITA is to set up an impromptu, loose, conflict free schedule relative to an initial control exchange. We study the performance of SITA when implemented as an overlay over 802.11 in the ns-2 simulator. Our results show that, with real-time like traffic, SITA provides significant improvement in the end-to-end throughput, by as much as 300%, and on order of magnitude or more decrease in the end-to-end delay and jitter when compared with the vanilla 802.11.