Harnessing Exposed Terminals in Wireless Networks
by Mythili Vutukuru, Kyle Jamieson, Hari Balakrishnan
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| abstract: | This paper presents the design, implementation, and ex-
perimental evaluation of CMAP (Conflict Maps), a system
that increases the number of successful concurrent trans-
missions in a wireless network, achieving higher aggregate
throughput compared to networks that use carrier sense
multiple access (CSMA). CMAP correctly identifies and ex-
ploits exposed terminals in which two senders are within
range of one another, but each intended receiver is far
enough from the other sender that the two transmissions can
succeed even if done concurrently. CMAP includes a reac-
tive channel access scheme in which nodes transmit con-
currently (even if there’s the possibility of a collision), then
observe the loss probability to determine whether they are
better off transmitting concurrently or not. Experimental re-
sults from a 50-node 802.11a testbed show that CMAP im-
proves throughput by 2× over CSMA with exposed termi-
nals, while converging to the performance of CSMA when
the senders and receivers are all close to each other. CMAP
also improves throughput by up to 47% over CSMA in real-
istic access point-based networks by exploiting concurrent
transmission opportunities. | | url: | http://www.mit.edu/~mythili/research/cmap.pdf | | type: | misc |
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