Orchestrating Spaital
Reuse in Wireless Ad Hoc Networks Using Synchronous Collision Resolution
(SCR)
2003 Award Winner
John A. Stine, The MITRE Corporation
Gustavo de Veciana, The University of Texas at Austin
Kevin H. Grace, The MITRE Corporation
Robert C. Durst, The MITRE Corporation
ABSTRACT
We propose a novel medium access control protocol for ad hoc wireless
networks called Synchronous Collision Resolution (SCR). The protocol
assumes that nodes in the network are synchronized, thus, nodes with
data to send can contend simultaneously for the channel. Nodes contend
for access using a synchronous signaling mechanism that achieves two
objectives: it arbitrates contentions locally and it selects a subset
of nodes across the network that attempt to transmit simultaneously.
The subset of nodes that survive the signaling mechanism can be viewed
as an orchestrated set of transmissions that are spatially reusing the
channel shared by the nodes. Thus the "quality" of the subset
of nodes selected by the signaling mechanism is a key factor in determining
the spatial capacity of the system. In this paper, we propose a general
model for such synchronous signaling mechanisms and recommend a preferred
design. We then focus via both analysis and simulation on the spatial
and capacity characteristics of these access control mechanisms. Our
work is unique in that it specifically focuses on the spatial capacity
aspects of a MAC protocol, as would be critical for ad hoc networking,
and shows SCR is a promising solution. Specifically, it does not suffer
from congestion collapse as the density of contending nodes grows, it
does not suffer from hidden or exposed node effects, it achieves high
capacities with a spatial usage exceeding 1 (i.e. more than one packet
exchange in the area covered by a transmission), and it facilitates
the integration of new physical layer capacity increasing technologies.
Publication
World Scientific Journal of Interconnection Networks, Vol.
3, Nos. 3 and 4, pp. 167-195.
Additional Search Keywords
medium access control (MAC) protocols, mobile ad hoc networks,
synchronous collision resolution (SCR), collision resolution signaling,
spatial reuse, network capacity, wireless networks
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