Abstract
Cooperative communication improves the link throughput of wireless networks through spatial diversity. However, it reduces the frequency reuse of the entire network due to the enlarged link interference range introduced by each helper. In this paper, we propose a cooperative medium access control (MAC) protocol with optimal relay selection (ORS-CMAC) for multihop, multirate large scale networks, which can reduce the interference range and improve the network throughput. Then, we investigate the performance gain achieved by these two competitive factors, i.e., the spatial frequency reuse gain and spatial diversity gain, in large scale wireless networks. The expressions of maximum network throughput for direct transmissions and cooperative transmissions in the whole network are derived as a function of the number of concurrent transmission links, data packet length, and average packet transmission time. Simulation results validate the effectiveness of the theoretical results. The theoretical and simulation results show that the helper can reduce the spatial frequency reuse slightly, and spatial diversity gain can compensate for the decrease of the spatial frequency reuse, thereby improving the network throughput from the viewpoint of the whole network.
Highlights
Large scale wireless networks, such as mobile ad hoc networks, wireless sensor networks, and vehicle ad hoc networks, have attracted increasingly more interest in the past decade because of their easy deployment and fast configuration [1]
To reduce the interference range introduced by the helpers, improve the spatial frequency reuse gain (SFRG), and improve the whole network throughput, we propose a cooperative medium access control (MAC)
TCPD is the expected time consumed in cooperative priority differentiation (CPD) by selecting the helpers with different priorities or using the direct transmission if no suitable helpers can participate in the cooperative transmission, TCHS is the expected time of choosing the optimal helpers in each area Aij in the process of contention for helper selection (CHS), and TPKT is the average transmission time of each data packet by using possible or types of cooperative transmission when there is only one helper selected after CHS, or using direct transmission when more than one helper is selected after CHS or no helpers exist in all possible cooperative regions
Summary
Large scale wireless networks, such as mobile ad hoc networks, wireless sensor networks, and vehicle ad hoc networks, have attracted increasingly more interest in the past decade because of their easy deployment and fast configuration [1]. The MAC protocol used to solve the medium sharing work has among appliedmultiple cooperative communication to higher layers,performance, especially the such adjacent medium access problem nodes, which is critical to network as throughput and control layer. Whether a link needs node cooperation helper in the large scale wireless networks. We investigate the impact of time in the process of helper selection and data packet transmissions on the network throughput and cooperation gain. MAC protocol with optimal relay selection (ORS-CMAC) for multirate large scale wireless networks. To reduce the interference range introduced by the helpers, improve the spatial frequency reuse gain (SFRG), and improve the whole network throughput, we propose a cooperative MAC protocol with optimal relay selection, i.e., ORS-CMAC protocol.
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