Abstract
In recent years, the growing interest in video-based applications has resulted in a rapid increase in wireless data traffic and meeting the stringent quality-of-experience (QoE) requirements for such type of traffic poses a great challenge given the scarce spectrum. As a consequence, new approaches have been investigated to tackle this problem and one promising solution proposed by researchers is to exploit device-to-device (D2D) communication in video transmission. D2D communication has been presented as an innovation that can improve the cellular network performance by exploiting the proximity-based service between closely-located devices. It enhances the spectral and energy efficiencies, improves the capacity of the network and reduces the communication delay as well. Despite the above-mentioned advantages, there are some challenges in video transmission over D2D networks that need to be addressed. These issues include proposing methods for improving the quality of video streaming, management of the possible resulting interference between the D2D links and regular cellular links, resource allocation as well as appropriate selection of the mode of operation. Besides, issues related to D2D-based video caching such as clustering, energy consumption and the use of incentive-based schemes have also been discussed. In this paper, we examine the challenges of video streaming over D2D networks and comprehensively review the available solutions proposed in the literature.
Highlights
The tremendous increase in the number of portable devices and mobile applications have prompted exponential growth in wireless traffic
D2D communication is presented as a key solution to enhance the performance of traditional cellular networks
Multimedia applications have constituted the main drive of the growing demands of cellular data traffic and D2D is proposed as a technique to offload wireless networks and can be exploited to achieve high-quality video transmission
Summary
The tremendous increase in the number of portable devices and mobile applications have prompted exponential growth in wireless traffic. In [21], the authors reviewed the existing works on D2D communication underlaying an LTE network; they focused on aspects such as D2D discovery, link establishment and D2D implementation They highlighted the open research issues that require further investigation. The majority of existing works on video transmission over D2D links propose the idea of caching popular video files in smartphones and sharing them with other users via D2D communication to reduce backhaul traffic. When a user requests a specific video file from the network and the BS finds that it has been cached by one of the requester’s cluster members and the distance between them is less than a specific collaboration distance r, the file is transmitted using a direct D2D link This transmission mode is labeled as direct D2D transmission as shown in Fig. 4 and the collaboration distance is usually determined according to the transmission power. We discuss and compare both probabilistic and deterministic caching schemes
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