Abstract
Wireless multimedia sensor networks (WMSNs) have been improved with the increase of multimedia data. In WMSNs, a centralization problem can occur because of large-size multimedia data. It is necessary to consider device-to-device (D2D) communication. We focus on D2D WMSN based on cellular networks. Sensors in the D2D WMSN can non-orthogonally use a cellular link, which is a wireless communication channel between a sensor and an aggregator, and a D2D link, which is the channel between sensors. As a result, it has more complex interference environments than an ordinary system. Therefore, it is a key factor to manage the varying inter-cell interference effectively for throughput improvement. We propose an interference mitigation scheme that can be applied to D2D WMSN. In the proposed scheme, a cell is separated into six zones and orthogonal frequency is allocated to each zone for cellular links. The frequencies allocated to cellular links are reused by D2D links of neighboring zones. The simulation results show that the throughput of the proposed scheme increases two times compared to a static frequency allocation scheme.
Highlights
As enhancements of devices’ capabilities to record and play video continue to progress, demands to cope with the mobile multimedia data traffic increase [1,2,3]
Most studies of fractional frequency reuse are based on an inter-cell interference coordination scheme (ICIC) [30], where all frequencies are available in the central region of a cell and partitioned frequencies are allocated for cell-edge areas
In the Wireless multimedia sensor networks (WMSNs), multimedia data should be transmitted in real time
Summary
As enhancements of devices’ capabilities to record and play video continue to progress, demands to cope with the mobile multimedia data traffic increase [1,2,3]. Since WMSN consists of sensors, the WMSN technologies have been developed to ensure Quality of Service (QoS) and to overcome limited computing power and energy of sensors [4,5,9,10] As these problems of limitation are reduced, the WMSN can be applied to future smart cities, security systems, or industries [11]. Studies of the D2D link underlaying system consider QoS requirements. The authors of [26] propose a radio resource allocation scheme that considers the intra cell interference and increases the throughput of whole cell. The proposed scheme allocates each orthogonal frequency to cellular links of six zones one by one. Interference between the two links can be reduced by the proposed scheme.
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