Access Restriction

Author Ghosh, C. ♦ Safavi-Naeini, H. A. ♦ Roy, S. ♦ Stahl, J.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Dynamic Spectrum Access Network Qp-csma-ca ♦ Ieee International Symposium ♦ Testbed Implementation ♦ System Throughput ♦ Carrier Sense Multiple Access-collision Avoidance ♦ Universal Software Radio Peripheral ♦ Simulation Result ♦ Out-of-network Transmission ♦ Synchronized Duration ♦ Extended Back-off Phase ♦ Cognitive Networking Set-up ♦ Medium Access Latency ♦ Secondary Client ♦ Qp-csma-ca Protocol ♦ Wi-fi Node ♦ Uplink Transmission ♦ Dedicated Sensing-based Mechanism ♦ Radio Platform ♦ Quiet Period ♦ Small Network ♦ Channel Status
Abstract 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.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study