|
iDEA: Drexel E-repository and Archives >
Drexel Academic Community >
College of Engineering >
Department of Electrical and Computer Engineering >
Faculty Research and Publications (ECE) >
A new protocol to mitigate the unheard RTS/CTS problem in networks with switched beam antennas
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/1890
|
| Title: | A new protocol to mitigate the unheard RTS/CTS problem in networks with switched beam antennas |
| Authors: | RamMohan, Valli
Harish, Sethu
Madhusudan, Hosaagrahara
Kapil, Dandekar |
| Issue Date: | 5-Feb-2007 |
| Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
| Citation: | Paper presented at the 2007 2nd International Symposium on Wireless Pervasive Computing, San Juan, PR, US. |
| Abstract: | Wireless networks with the capability for directional
transmissions using switched beam antennas have increasingly
been used to increase the coverage area of nodes as well as to
improve spatial reuse. This paper is concerned with the unheard
RTS/CTS problem that arises due to the use of directional
transmissions. The problem occurs because a node, while beamformed
in one direction, cannot hear the RTS/CTS messages
that arrive on another direction with information pertaining
to channel reservation. A node, therefore, transmits when it
should defer, leading to unnecessary collisions and degraded
performance. In this paper, we propose a new MAC protocol
that uses a combination of three features to combat the problem:
fragmentation of packets, the use of a tone signal to alert potential
collision-causing nodes during ongoing transmission, and the use
of a pause period when transmission is likely to lead to a collision.
As opposed to other recent work on this problem, our protocol
does not assume separate data and control channels. We present
simulation results showing that our protocol can reduce the
number of retransmissions of data packets due to the unheard
RTS/CTS problem by as much as 86%, thus improving the delay
and throughput characteristics of the network. |
| URI: | http://dx.doi.org/10.1109/ISWPC.2007.342587
http://hdl.handle.net/1860/1890 |
| Appears in Collections: | Faculty Research and Publications (ECE)
|
Items in iDEA are protected by copyright, with all rights reserved, unless otherwise indicated.
|
www.drexel.edu
