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This paper proposes a multi-objective optimization evolutionary algorithm for placement of roadside units (RSUs) in participatory sensing using vehicular networks. The proposed algorithm heuristically optimizes RSUs' communication coverage area in a city with the minimal number of RSUs. The extensive simulation results show the efficacy of the proposed algorithm comparing to a traditional placement...
This paper presents a method for shaping the transmit pulse of a molecular signal such that the diffusion channel's response is a sharp pulse. The impulse response of a diffusion channel is typically characterised as having an infinitely long transient response. This can cause severe inter-symbol-interference, and reduce the achievable reliable bit rate. We achieve the desired chemical channel response...
This paper proposes a novel multicast mobility solution aimed for mobile video, empowered by a cross-layer approach leveraging on the capabilities of Multicast Context Transfer and IEEE 802.21 Media-Independent Handover. The proposed solution was implemented and deployed in a real testbed, with results showing the significantly reduced latency for vertical handovers.
Content-Centric Networking (CCN) promises to yield large efficiency gains for Internet content distribution. Its autonomous cache management, however, raises doubts about achieving the intended goals optimally. A coordinated cache management, based on timely usage information, will help to fully leverage the cache efficiency. In this poster we introduce CoMon, a system architecture that implements...
Short-range wireless communication technologies have been used in many security-sensitive smartphone applications and services such as contactless micro payment and device pairing. Typically, the data confidentiality of existing short-range communication systems relies on key-exchange then encryption mechanism, which is inefficient, especially for short communication sessions. In this work, we present...
Remarkable progress was made with smartphones in the last few years. Modern smartphones are now equipped with high-resolution cameras and various micro-electrical sensors that open up new mobile application possibilities. In this work, we address a critical task of reconstruct indoor large-scale 3D model from crowd-sourced images. We propose, design, and implement IndoorCrowd, a smartphone empowered...
Multi-File dissemination through wireless communication has attracted considerable attentions in recent years, especially when Device-to-Device (D2D) communication is developed to support peer-to-peer file transmission. To decrease the total delay, the authors in [1] proposed a cluster-based D2D network in which files are transmitted from the BS to several cluster-heads, and then shared inside each...
We consider a network consisting of a file server connected through a shared link to a number of users, each equipped with a cache. Knowing the popularity distribution of the files in the database, the goal is to optimally populate the caches such as to minimize the expected load of the shared link. For a single user, it is well known that caching the most popular files is optimal in this setting...
Unlike traditional file transfer where only total delay matters, streaming applications impose delay constraints on each packet and require them to be in order. To achieve fast in-order packet decoding, we have to compromise on the throughput. We study this trade-off between throughput and in-order decoding delay, and in particular how it is affected by the frequency of block-wise feedback, whereby...
Caching decreases content access time by keeping contents closer to the clients. In this paper we show that network coding chunks of different contents and storing them in cache, can be beneficial. Recent research considers caching network coded chunks of same content, but not different contents. This paper proposes three different methods, IP, layered-IP and Greedy algorithm, with different performance...
Layered coding elegantly handles user bandwidth heterogeneity in video conferencing, however, it incurs rate and complexity overheads. An alternative is partitioning the receiver sets and using non-layered coding for each group. In this paper, we investigate how to maximize the received video quality for both systems under uplink and downlink capacity constraints, while limiting the number of hops...
Wireless video transmission systems have been widely adopted to facilitate the ubiquitous access of the multimedia services on the Internet. However, wireless links are not stable and the channel quality might vary with time. Efficient modulation scheme plays an important role to improve the quality of service (QoS) of video transmission. However, the previous efforts mainly focused on the rectangular...
Real-time multimedia comprises a large, and growing, fraction of mobile data traffic. An important subset of such flows are from interactive conferencing applications using RTP on UDP/IP to reduce latency. UDP has no congestion control, and while the IETF is developing RTP-level congestion control algorithms as part of the WebRTC standards, these will take time to finalise and deploy. In the interim,...
A common situation occurring when dealing with multimedia traffic is having large data frames fragmented into smaller IP packets, and having these packets sent independently through the network. For real-time multimedia traffic, dropping even few packets of a frame may render the entire frame useless. Such traffic is usually modeled as having inter-packet dependencies. We study the problem of scheduling...
Wireless Multimedia Sensor Networks (WMSNs) are considered as one of the most prominent infrastructures for human-centric multimedia applications due to the wide availability of low-cost hardware such as microphones and CMOS cameras. By virtue of the energy limitations on sensor nodes alongside the explicit highly demanding bandwidth requirements of real-time multimedia applications, these particular...
This paper investigates how a p2p television platform can take advantage of the presence of frequent channel viewers to grant them a more satisfying service than to less regular spectators. The idea we explore is to learn beforehand about the users' interests, in order to cluster them in groups that display different behaviors; then, the neighborhood creation strategy and video chunk scheduling algorithm...
In this paper, we consider the time-varying characteristics of practical wireless networks, and propose a joint dynamic rate allocation and transmission scheduling optimization scheme for scalable video multi-rate multicast based on opportunistic routing (OR) and network coding. With OR, the decision of optimal routes for scalable video coding (SVC) layered streaming is integrated into the joint optimization...
In this article we present the performance evaluation of different algorithms to distribute video frames from network cameras to multiple concurrent clients in real-time. The algorithms evaluated in this paper rely on a pool of buffers shared by all the clients. We implement these algorithms in the VLC media player and study their performance in terms of frame rate, hardware resource usage and decoding...
Social network companies maintain complete visibility and ownership of the data they store. However users should be able to maintain full control over their own content. For this purpose, we propose WARP, an architecture based upon Information-Centric Networking (ICN) designs, which expands the scope of the ICN architecture beyond media distribution, to provide data control in social networks. The...
Over the past few years, mobile devices, particularly smartphones have seen dramatic increases in data consumption. The significant increases in data usage have placed tremendous strain on the wireless infrastructure necessitating research across a variety of optimization, efficiency, and capacity improvements. Complementary to those research efforts is the acquisition of a better understanding what...
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