Seminars & Events

Mathematics and Computer Science Division
"DRAMA: Dynamic Reservation Medium Access for Multihop Wireless Real-Time Communications (Design and Implementation)"

DATE: December 20, 2011
TIME: 1:30 PM - 2:30 PM
SPEAKER: Jun Yi, Postdoc Interviewee
LOCATION: Building 240, Seminar Room 4301, Argonne National Laboratory
HOST: Raj Kettimuthu

Description:
Providing timeliness support for multihop wireless networks in a resource-efficient manner is an important and challenging problem, particularly at the medium access control layer. However, existing solutions are either over-coordinated (fixed-schedule-based schemes) or under coordinated (prioritized contention-based schemes), failing to address this problem efficiently. This paper introduces DRAMA, a new distributed, progressive, dynamic slot reservation mechanism, aiming to provide timeliness support at the medium access control layer. In DRAMA, each node progressively and dynamically makes short-term slot reservations according to the timeliness and bandwidth requirements of its outgoing traffic, thereby quickly adapting to traffic and link dynamics. Potentially interfering nodes reserve slots in a serialized and orthogonal manner, which ensures fast, negotiation-free, contention-free slot reservations with high bandwidth utilization and low bandwidth overhead. Similar to fixed schedule-based approaches, nodes in DRAMA can enter a low-power sleep mode when they do not transmit or receive data. Our experimental results show that DRAMA is able to meet end-to-end latencies under various traffic and link dynamics when other schemes may not be able to do so, while incurring little energy and bandwidth overhead.

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