Abstract
Device-to-Device (D2D) communication is a novel approach that has been proposed to enhance the performance of traditional cellular networks. This work focuses on video streaming using D2D communications underlaying a Long Term Evolution (LTE) network where resources are allocated to each D2D pair in three modes of operation; cellular, dedicated and reuse. The objective is to maximize the sum-rate of the D2D pairs while maintaining continuous video playback with an acceptable quality level. Unlike previous works, which assign one channel to each user or divide the available resources equally between them or assume constant bit rate streaming (CBR), we estimate the number of Resource Blocks (RBs) needed for all users according to their rate and Signal-to-Noise Ratio (SNR) requirements and consider Scalable Video Coding (SVC). A complete Quality of Experience (QoE)-aware framework for D2D-based video streaming that includes resource allocation, power control, mode selection and SVC layer selection is then proposed while taking into consideration buffer occupancies and the video peak signal-to-noise ratio (PSNR). The efficacy of the proposed scheme is evaluated through extensive simulations and compared to the scenario where only one mode of operation is assigned to all D2D pairs. Furthermore, the effect of the number of D2D users as well as their mobility is also investigated. Simulation results show that the proposed framework improves the throughput of the D2D pairs when compared to a single mode of operation while at the same time providing better video quality and continuity.
Highlights
The past few decades have witnessed an exponential growth in both the number of cellular subscribers as well as their traffic demands
We investigate the impact of user mobility as defined by the Random Walk (RW) model in Section II-D on the system performance using two metrics; video quality and the contact probability defined as the probability that a user is within the D2D range and data is received directly from the neighboring device using either the reuse or dedicated modes [55]
Mode selection and power control for multiple D2D pairs have been addressed with the goal of maximizing the throughput of the D2D users while considering the quality of experience requirements represented by video quality and continuity
Summary
The past few decades have witnessed an exponential growth in both the number of cellular subscribers as well as their traffic demands. Design a complete framework for video streaming over D2D-enabled networks that performs resource allocation, scheduling and mode selection for a group of D2D pairs considering the available resources, minimum rate requirements, video quality as well as buffer occupancy. The second scenario is when there are not enough RBs for all the users and those with low PF metric will not be scheduled In this mode, actual D2D connections are established without crossing the BS and a number of resources, nDd , is allocated to the dth D2D pair according to the RR or PF strategies as before. Details pertaining to the calculation of the achievable rates RC , RD and RR, for the cellular, dedicated and reuse modes, respectively, based on the number of assigned RBs, level of interference (if any) and according to the LTE standard will be given. Where f (IMmCSd , nmd ) is a mapping relation between the MCS and the number of RBs
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