Throughput analysis of primary and secondary networks in a shared IEEE 802.11 system

Kumar, Santhosh and Shende, Nirmal and Murthy, Chandra R and Ayyagari, Arun (2013) Throughput analysis of primary and secondary networks in a shared IEEE 802.11 system. In: IEEE Transactions on Wireless Communications, 12 (3). pp. 1006-1017.

PDF IEEE_Tran_Wir_Com_12-3_1006_2013.pdf - Published Version Restricted to Registered users only Download (409kB) | Request a copy

Abstract

In this paper, we analyze the coexistence of a primary and a secondary (cognitive) network when both networks use the IEEE 802.11 based distributed coordination function for medium access control. Specifically, we consider the problem of channel capture by a secondary network that uses spectrum sensing to determine the availability of the channel, and its impact on the primary throughput. We integrate the notion of transmission slots in Bianchi's Markov model with the physical time slots, to derive the transmission probability of the secondary network as a function of its scan duration. This is used to obtain analytical expressions for the throughput achievable by the primary and secondary networks. Our analysis considers both saturated and unsaturated networks. By performing a numerical search, the secondary network parameters are selected to maximize its throughput for a given level of protection of the primary network throughput. The theoretical expressions are validated using extensive simulations carried out in the Network Simulator 2. Our results provide critical insights into the performance and robustness of different schemes for medium access by the secondary network. In particular, we find that the channel captures by the secondary network does not significantly impact the primary throughput, and that simply increasing the secondary contention window size is only marginally inferior to silent-period based methods in terms of its throughput performance.

Item Type:	Journal Article
Publication:	IEEE Transactions on Wireless Communications
Publisher:	IEEE-Inst Electrical Electronics Engineers Inc
Additional Information:	Copyright of this article belongs to IEEE-Inst Electrical Electronics Engineers Inc.
Keywords:	Cognitive Radio; Distributed Coordination Function; MAC Protocols; Network Throughput
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	28 May 2013 11:29
Last Modified:	28 May 2013 11:29
URI:	http://eprints.iisc.ac.in/id/eprint/46607

Actions (login required)

View Item