Paper Info
Title
QP-CSMA-CA: A modified CSMA-CA-based cognitive channel access mechanism with testbed implementation
Abstract
In this paper, a modified carrier sense multiple access-collision avoidance (CSMA-CA) mechanism, termed as quiet period-CSMA-CA (QP-CSMA-CA) is proposed, for the purposes of coexistence in a cognitive networking set-up with secondary clients that seek access using 802.11. In work to date, dedicated quiet periods have been defined for this purpose, as a synchronized duration wherein all clients are prohibited from uplink transmissions; this interval is intended for sensing channel status so as to detect out-of-network transmissions. However, such dedicated periods may adversely impact system throughput as the price for coexistence. In QP-CSMA-CA, the Wi-Fi nodes perform channel sensing during an extended back-off phase; thereby bypassing the need for separate dedicated sensing interval. The proposed QP-CSMA-CA protocol is implemented on the universal software radio peripheral (USRP)-based software defined radio platform and configured in a small network for measuring throughput and latency. Experimental and simulation results show the efficacy of the proposed algorithm over the dedicated sensing-based mechanism when compared in terms of system throughput and medium access latency.
Year
DOI
Venue
2012
10.1109/DYSPAN.2012.6478174
DySPAN
Keywords
Field
DocType
sensing, quiet period, CSMA-CA, USRP, TV White Space
Software-defined radio,Computer science,Universal Software Radio Peripheral,Testbed,Computer network,Communication channel,Real-time computing,Throughput,Carrier sense multiple access with collision avoidance,Telecommunications link,Cognitive radio
Conference
ISBN
Citations 
PageRank 
978-1-4673-4446-3
4
0.50
References 
Authors
5
5
Name
Order
Citations
PageRank
Chittabrata Ghosh140.50
Hossein-Ali Safavi-Naeini2111.38
S. Roy358545.16
Klaus Doppler41723153.67
J. Stahl540.50