scholarly journals Channel Access and Power Control for Mobile Crowdsourcing in Device-to-Device Underlaid Cellular Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yue Ma ◽  
Li Zhou ◽  
Zhenghua Gu ◽  
Yang Song ◽  
Bin Wang
Keyword(s):  
Power Control ◽  
Cellular Networks ◽  
Spectral Efficiency ◽  
Cellular Network ◽  
Handheld Devices ◽  
Channel Access ◽  
Mobile Crowdsourcing ◽  
Device To Device ◽  
Area Spectral Efficiency ◽  
The Impact

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.

scholarly journals Resource Allocation with a Rate Guarantee Constraint in Device-to-Device Underlaid Cellular Networks

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 438 ◽  
Author(s):  
Doyle Kwon ◽  
Duk Kyung Kim
Keyword(s):  
Resource Allocation ◽  
Power Control ◽  
Cellular Networks ◽  
Channel Assignment ◽  
Optimization Problem ◽  
Data Rate ◽  
Integer Programming Problem ◽  
Channel Bandwidth ◽  
Device To Device ◽  
The Impact

Device-to-device (D2D) communication is a crucial technique for various proximity services. In addition to high-rate transmission and high spectral efficiency, a minimum data rate is increasingly required in various applications, such as gaming and real-time audio/video transmission. In this paper, we consider D2D underlaid cellular networks and aim to minimize the total channel bandwidth while every user equipment (UE) needs to achieve a pre-determined target data rate. The optimization problem is jointly involved with matching a cellular UE (CU) to a D2D UE (DU), and with channel assignment and power control. The optimization problem is decoupled into two suboptimization problems to solve power control and channel assignment problems separately. For arbitrary matching of CU, DU, and channel, the minimum channel bandwidth of the shared channel is derived based on signal-to-interference-plus-noise ratio (SINR)-based power control. The channel assignment is a three-dimensional (3-D) integer programming problem (IPP) with a triple (CU, DU, channel). We apply Lagrangian relaxation, and then decompose the 3-D IPP into two two-dimensional (2-D) linear programming problems (LPPs). From intensive numerical results, the proposed resource allocation scheme outperforms the random selection and greedy schemes in terms of average channel bandwidth. We investigate the impact of various parameters, such as maximum D2D distance and the number of channels.

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