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Dive into the research topics where Zhenhui Yuan is active.

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Featured researches published by Zhenhui Yuan.


wireless communications and networking conference | 2013

An energy-aware multipath-TCP-based content delivery scheme in heterogeneous wireless networks

Shengyang Chen; Zhenhui Yuan; Gabriel-Miro Muntean

IETF-proposed Multipath TCP (MPTCP) extends the standard TCP and allows data streams to be delivered across multiple simultaneous connections and consequently paths. The multipath capability of MPTCP provides increased bandwidth for applications in comparison with the classic single-path TCP, which makes it highly attractive for the current consumer mobile devices that support more than one radio interfaces (e.g. 3G, WiFi, Bluetooth, etc.). However, MPTCP does not consider energy consumption aspects which are highly important for these devices. This paper proposes eMTCP, a novel energy-aware MPTCP-based content delivery scheme which balances support for increased throughput with energy consumption awareness. eMTCP is located at upper transport layer in mobile devices and requires no additional modifications of the MPTCP-enabled server. eMTCP increases the energy efficiency of mobile devices by offloading traffic from the more energy-consuming interfaces to others. Simulation-based experiments employing an eMTCP model which sends data streams via the 3GPP Long Term Evolution (LTE) and IEEE 802.11 (WiFi) interfaces show an increase of up to 14% in energy efficiency when using eMTCP in comparison with MPTCP and of up to 66% in terms of quality in comparison with single-path TCP.


IEEE Transactions on Multimedia | 2015

Perceived Synchronization of Mulsemedia Services

Zhenhui Yuan; Ting Bi; Gabriel-Miro Muntean; Gheorghita Ghinea

Multimedia synchronization involves a temporal relationship between audio and visual media components. The presentation of “in-sync” data streams is essential to achieve a natural impression, as “out-of-sync” effects are often associated with user quality of experience (QoE) decrease . Recently , multi-sensory media (mulsemedia) has been demonstrated to provide a highly immersive experience for its users. Unlike traditional multimedia, mulsemedia consists of other media types (i.e., haptic, olfaction, taste, etc.) in addition to audio and visual content. Therefore, the goal of achieving high quality mulsemedia transmission is to present no or little synchronization errors between the multiple media components. In order to achieve this ideal synchronization, there is a need for comprehensive knowledge of the synchronization requirements at the user interface. This paper presents the results of a subjective study carried out to explore the temporal boundaries within which haptic and air-flow media objects can be successfully synchronized with video media. Results show that skews between sensorial media and multimedia might still give the effect that the mulsemedia sequence is “in-sync” and provide certain constraints under which synchronization errors might be tolerated. The outcomes of the paper are used to provide recommendations for mulsemedia service providers in order for their services to be associated with acceptable user experience levels, e.g. haptic media could be presented with a delay of up to 1 s behind video content, while air-flow media could be released either 5 s ahead of or 3 s behind video content.


IEEE Transactions on Vehicular Technology | 2012

MBE: Model-Based Available Bandwidth Estimation for IEEE 802.11 Data Communications

Zhenhui Yuan; Hrishikesh Venkataraman; Gabriel-Miro Muntean

Wireless bandwidth estimation is a critical issue for quality-of-service (QoS) provisioning in IEEE 802.11 wireless local area networks (WLANs). Current bandwidth estimation solutions focus on either probing techniques or cross-layer techniques and require either significant bandwidth resources or protocol modifications. To alleviate these problems, this paper proposes an analytical model-based bandwidth estimation algorithm (MBE) for multimedia services over IEEE 802.11 networks. The MBE module for available bandwidth estimation is developed based on novel transmission control protocol/user datagram protocol throughput models for wireless data communications. The novel aspects in comparison with other works include the fact that no probing traffic is required and that no modification of medium access control (MAC) protocol is needed. Extensive simulations and real tests were performed, demonstrating that MBE has very good bandwidth estimation results for content delivery in conditions with different packet sizes, dynamic wireless link rate, and different channel noises. Additionally, MBE has lower overhead and lower error rate than other state-of-the-art bandwidth estimation techniques.


ACM Transactions on Multimedia Computing, Communications, and Applications | 2014

User Quality of Experience of Mulsemedia Applications

Zhenhui Yuan; Shengyang Chen; Gheorghita Ghinea; Gabriel-Miro Muntean

User Quality of Experience (QoE) is of fundamental importance in multimedia applications and has been extensively studied for decades. However, user QoE in the context of the emerging multiple-sensorial media (mulsemedia) services, which involve different media components than the traditional multimedia applications, have not been comprehensively studied. This article presents the results of subjective tests which have investigated user perception of mulsemedia content. In particular, the impact of intensity of certain mulsemedia components including haptic and airflow on user-perceived experience are studied. Results demonstrate that by making use of mulsemedia the overall user enjoyment levels increased by up to 77%.


IEEE Transactions on Network and Service Management | 2013

A Prioritized Adaptive Scheme for Multimedia Services over IEEE 802.11 WLANs

Zhenhui Yuan; Gabriel-Miro Muntean

IEEE 802.11e protocol enables QoS differentiation between different traffic types, but requires MAC layer support and assigns traffic with static priority. This paper proposes an intelligent Prioritized Adaptive Scheme (iPAS) to provide QoS differentiation for heterogeneous multimedia delivery over wireless networks. iPAS assigns dynamic priorities to various streams and determines their bandwidth share by employing a probabilistic approach-which makes use of stereotypes. Unlike existing QoS differentiation solutions, the priority level of individual streams in iPAS is variable and considers service types and network delivery QoS parameters (i.e. delay, jitter, and packet loss rate). A bandwidth estimation technique is adopted to provide network conditions and the IEEE 802.21 framework is used to enable control information exchange between network components without modifying existing MAC protocol. Simulations and real life tests demonstrate how better results are obtained when employing iPAS than when either IEEE 802.11 DCF or 802.11e EDCA mechanisms are used. The iPAS key performance benefits are as follows: 1) better fairness in bandwidth allocation; 2) higher throughput than 802.11 DCF and 802.11e EDCA with up to 38% and 20%, respectively; 3) enables definite throughput and delay differentiation between streams.


international symposium on broadband multimedia systems and broadcasting | 2010

iPAS: An user perceived quality-based intelligent Prioritized Adaptive Scheme for IPTV in Wireless Home Networks

Zhenhui Yuan; Hrishikesh Venkataraman; Gabriel-Miro Muntean

There are several real-time dynamic adaptation mechanisms that exist today for improving end user perceived quality for IPTV services in wireless local networks. However, an adaptation scheme based on stream priorities, combined with terminals characteristics and the expected service quality levels, has not been explicitly considered by the existing approaches. This paper proposes a novel solution - the intelligent Prioritized Adaptive Scheme (iPAS) for adapting the encoding and transmission bitrates of video traffic based on stream priority and current network bandwidth resources as estimated by the bandwidth estimation technique, iBE. Results show how iPAS outperforms an equal priority solution in terms of distribution of both bandwidth between streams with different requirements and associated user perceived quality.


international symposium on broadband multimedia systems and broadcasting | 2014

No reference objective quality metric for stereoscopic 3D video

Yi Han; Zhenhui Yuan; Gabriel-Miro Muntean

The stereoscopic three-dimensional (3D) video technologies have achieved significant success in providing enhanced immersive experience to consumers. However network delivery of 3D video content at good quality levels is challenging mostly due to the variable network conditions. In this context, efficient objective 3D video quality assessment is a critical aspect, in particular for video service providers who need to adjust the video delivery process to the network conditions in real-time. Current objective 3D video quality assessment methods are reference-based, requiring the availability of the original 3D video sequences, which is difficult to achieve in practice. Additionally, most of the existing 3D video quality metrics are developed for depth-enhanced 3D. This paper proposes the No reference objective Video Quality Metric (NVQM) for real-time 3D video quality assessment. NVQM considers the correlation between network packet loss and perceptual video quality for different bit-rate video sequences. NVQM is modeled based on the video quality model specified in ITU-T G.1070 and tuned according to results of extensive subjective tests. NVQM was developed for the evaluation of side-by-side stereoscopic 3D sequences, the most widely commercialized 3D video format. The performance of NVQM is studied by comparing against three state-of-the-art video quality objective models: structural similarity index (SSIM), video quality metric (VQM), and ITU-T G.1070. Results show that NVQM outperforms the existing objective metrics with up to 23% in terms of accuracy.


MMNS 2009 Proceedings of the 12th IFIP/IEEE International Conference on Management of Multimedia and Mobile Networks and Services: Wired-Wireless Multimedia Networks and Services Management | 2009

iBE: A Novel Bandwidth Estimation Algorithm for Multimedia Services over IEEE 802.11 Wireless Networks

Zhenhui Yuan; Hrishikesh Venkataraman; Gabriel-Miro Muntean

Recently, multimedia streaming services over IEEE 802.11 based wireless networks have increased dramatically. This results in manifold increase in the bandwidth requirement, especially for high-quality multimedia services. Given the bandwidth constraint in the wireless networks, one of the most critical factors in improving the end-to-end performance of multimedia application is the fast and accurate estimation of bandwidth. This paper proposes a novel bandwidth estimation algorithm, iBE. The significant feature of iBE is that it relies on multimedia packets only from the application layer. In addition, iBE recognizes the dynamic fluctuations of the wireless channel quickly, which in-turn enables iBE to be used for real-time services. The experimental results demonstrate that the accuracy of the bandwidth estimated by iBE is significantly superior to other methods like Spruce. Secondly, even in high traffic conditions, the bandwidth estimated by iBE is very close to the actual measured bandwidth, unlike the other state-of-the-art methods.


international conference on wireless communications and mobile computing | 2014

Quality of experience study for multiple sensorial media delivery

Zhenhui Yuan; Gheorghita Ghinea; Gabriel-Miro Muntean

Traditional video sequences make use of both visual images and audio tracks which are perceived by human eyes and ears, respectively. In order to present better ultra-reality virtual experience, the comprehensive human sensations (e.g. olfaction, haptic, gustatory, etc) needed to be exploited. In this paper, a multiple sensorial media (mulsemedia) delivery system is introduced to deliver multimedia sequences integrated with multiple media components which engage three or more of human senses such as sight, hearing, olfaction, haptic, gustatory, etc. Three sensorial effects (i.e. haptic, olfaction, and air-flowing) are selected for the purpose of demonstration. Subjective test is conducted to analyze the user perceived quality of experience of the mulsemedia service. It is concluded that the mulsemedia sequences can partly mask the decreased movie quality. Additionally the most preferable sensorial effect is haptic, followed by air-flowing and olfaction.


global communications conference | 2013

A traffic burstiness-based offload scheme for energy efficiency deliveries in heterogeneous wireless networks

Shengyang Chen; Zhenhui Yuan; Gabriel-Miro Muntean

Latest mobile multimedia applications have important impact on smartphone usage in terms of both energy consumption and Quality of Service (QoS) levels. This impact is dependent on the level of burstiness of the multimedia traffic. This paper proposes eMTCP-BT, a novel energy-efficiency-oriented offloading scheme for multipath TCP (MPTCP) deliveries which considers traffic burstiness level in its decision making process. Mobile applications traffic is categorized according to its burstiness level, including some most widely-used services such as Voice over IP (VoIP) service, video streaming, large file downloading and web browsing. eMTCP-BT increases the energy efficiency of the multipath TCP content deliveries by performing an innovative distribution of the overall traffic for its delivery via the available wireless network interfaces (and paths) based on the traffic burstiness level. Real traffic trace-based simulation experiments have been conducted involving a mobile device receiving traffic over the Long Term Evolution (LTE) and IEEE 802.11 interfaces. Result analysis demonstrates how eMTCP-BT outperforms both eMTCP and the original MPTCP in terms of energy efficiency by up to 91.68%.

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Ting Bi

Dublin City University

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Yi Han

University College Dublin

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Jie Jin

Dublin City University

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Tom Molloy

Dublin City University

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