Using Directional Antennas for Medium Access Control in Ad Hoc Networks
by Romit Roy Choudhury, Xue Yang, Ram Ramanathan, Nitin H. Vaidya
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| abstract: | Previous research in wireless ad hoc networks typically assumes
the use of omnidirectional antennas at all nodes. With
omnidirectional antennas, while two nodes are communicating
using a given channel, MAC protocols such as IEEE
802.11 require all other nodes in the vicinity to stay silent.
With directional antennas, two pairs of nodes located in
each other’s vicinity may potentially communicate simultaneously,
depending on the directions of transmission. This
can increase spatial reuse of the wireless channel. In addition,
the higher gain of directional antennas allows a node
to communicate with other nodes located far away, implying
that messages could be delivered to the destination in fewer
hops. In this paper, we propose a MAC protocol that exploits
the characteristics of directional antennas. Our design
focuses on using multi-hop RTSs to establish links between
distant nodes, and then transmit CTS, DATA and ACK over
a single hop. Results show that our directional MAC protocol
can perform better than IEEE 802.11, although we find
that the performance is dependent on the topology configuration
and the flow patterns in the system. | | url: | http://www.sigmobile.org/mobicom/2002/papers/p066-roychoudhury.pdf |
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