Abstract
With the access of a myriad of smart handheld devices in cellular networks, mobile crowdsourcing becomes increasingly popular, which can leverage omnipresent mobile devices to promote the complicated crowdsourcing tasks. Device‐to‐device (D2D) communication is highly desired in mobile crowdsourcing when cellular communications are costly. The D2D cellular network is more preferable for mobile crowdsourcing than conventional cellular network. Therefore, this paper addresses the channel access and power control problem in the D2D underlaid cellular networks. We propose a novel semidistributed network‐assisted power and a channel access control scheme for D2D user equipment (DUE) pieces. It can control the interference from DUE pieces to the cellular user accurately and has low information feedback overhead. For the proposed scheme, the stochastic geometry tool is employed and analytic expressions are derived for the coverage probabilities of both the cellular link and D2D links. We analyze the impact of key system parameters on the proposed scheme. The Pareto optimal access threshold maximizing the total area spectral efficiency is obtained. Unlike the existing works, the performances of the cellular link and D2D links are both considered. Simulation results show that the proposed method can improve the total area spectral efficiency significantly compared to existing schemes.
Highlights
With the development of intelligent handheld devices, mobile crowdsourcing is emerging as an efficient strategy to improve the user experiences of applications in wireless networks [1]
Though Nd,i is not the real number of active transmit DUE (TU) pieces on the subchannel i, the optimal access threshold based on Nd,i can achieve a good performance, which will be verified by the extensive simulations in the following
The D2D cellular network is an efficient way to carry out mobile crowdsourcing
Summary
With the development of intelligent handheld devices, mobile crowdsourcing is emerging as an efficient strategy to improve the user experiences of applications in wireless networks [1]. For the network-assisted device-decided method, each DUE selects suitable channels and decides the transmission power according to a minimum transmit power criterion and the power control instruction from the BS [11]. In this scheme, the BS does not need to know global information about each DUE and the overhead can be reduced significantly. Large-scale crowdsourcing tasks need the participation of ubiquitous mobile users, which is based on the network with high performance. The proposed scheme can improve the system efficiency significantly without high information feedback overhead, which is preferable for largescale crowdsourcing tasks
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