Olfa Ben Rhaiem

Routing protocols performance analysis for scalable video coding (SVC) transmission over mobile ad-hoc networks

The main challenge of future wireless networks is providing quality of service and quality of experience to satisfy the consumer. This can be achieved by providing mechanisms that will serve optimally the users with the required system resources according to the QoS. Satisfying video consumer require enhancing video streaming quality. Therefore, video streaming over wireless network and particularly over MANET necessitate deeper investigations. In this context, this paper focused on performance analysis of routing protocol over MANET for scalable video streaming. In this work the video codec under evaluation is H.264/SVC and the routing protocols are DSR, AODV, DSDV and AOMD. Our evaluation carried using the Ns-2 simulators configured to support an ad-hoc environment. The QoS metrics used in this analysis are Packet Delivery Ratio (PDR), Average End-to-end Delay and packets loss rate.

QoS Improvement for Video Streaming over MANET Using Network-Coding

Video streaming (like YouTube) services and related applications become more and more widespread. Therefore, video streaming delivery over a mobile ad-hoc network (MANET) becomes a necessity as an important content delivery infrastructure between the user (content consumer) and the content storage node. Furthermore, user mobility impacts the quality of the delivered video and hence new concepts should be considered. Accordingly, the innovative concept on network coding (NC) emerges as a promising approach for improving the video transmission quality mainly in multicast environment. In this paper, we focus on Quality of Service (QoS) improvement for video streaming over MANET using random network coding. Basically, we consider video coded by H264/SVC codec that generates packets with different priorities and uses the IEEE 802.11e MAC for traffic differentiation. A successful transmission of high priority packets leads to enhance the video transmission quality. Accordingly, we propose a transmission scheme to protect high priority packets from being lost. Our approach, named Multicast Scalable Video Transmission using Classification-Scheduling Algorithms and Network Coding over MANET (and denoted MSVT_CSA_NC), adopts a cross layer solution between the H.264/SVC codec, the network and MAC layers. Moreover, our delivery mechanisms based on random network coding ensure high throughput and low network load over MANET. Simulation results confirm the substantial performance improvement brought by our approach.

Information transmission based on network coding over wireless networks: a survey

Network coding (NC) for wireless local area network has received a lot of attention from researchers. It replaces the traditional methods of video erasure protection. The principal of NC is to combine several packets together before their transmission. Thus, NC is able to provide higher throughput, reliability and efficient transmission. Up to now, many works have been done to ensure the advantages and the robustness of NC against the packet loss and link failures. The performance gains of NC are successfully processed not only for data to increase throughput, but also for video streaming over wireless networks. In this context, this paper surveys and discusses the most popular approaches based on NC of both data and video transmission over wireless network (static or dynamic). Strength and limitations for robust video streaming and data transmission are deeply discussed.

Network coding-based approach for efficient video streaming over MANET

Video streaming over mobile ad-hoc networks is becoming a highly important application for reliably delivering the content between the user and the content storage node. The key challenge is, hence, to address the impact of the user mobility on the quality of the delivered video. Accordingly, the pioneering concept of network coding (NC) emerges as a promising approach for improving the video transmission quality mainly in multicast mobile environment. This work focuses on improving the Quality of Service of video streaming over mobile ad-hoc networks using random NC. We consider video coded by the widely-used H264/SVC codec that generates packets with different priorities and provides traffic differentiation using the IEEE 802.11e MAC. Intuitively, focusing on lowering the error transmission of high priority packets leads to enhance the video streaming quality. Accordingly, this work develops and proposes a new scalable transmission scheme that decreases the loss of high priority packets. Our approach, named Extended Multicast Scalable Video Transmission using Classification-Scheduling Algorithms and Network Coding over MANET (and denoted EMSCNC), adopts a cross layer design between the H.264/SVC codec, the network and MAC layers. Moreover, we develop an analytical framework allowing the performance evaluation in terms of throughput, delay, and packet delivery ratio. Simulation results validate our analytical model and confirm the substantial performance improvement brought by our approach.

Content-centric Network-Based MANET for Streaming Video Transmission

The content centric network (CCN) is the new communication paradigm conceived for the future Internet. The basic idea of CCN is to use content names as addresses instead of IP-based host addresses. Video streaming services like YouTube represent the most important part of the internet traffic. Recently, the impact of mobility on video streaming over multi-hop wireless networks has become the real challenge for researchers. In this paper we consider CCN as a fundamental driver for mobile ad hoc network (MANET) protocol design. For simulation the CCN approach implemented in ndnSIM has been used. Thus, we propose to extend this architecture to evaluate QoS of video streaming in CCN-based MANET. Through simulations, we investigate the feasibility and the performance of this design. Then we compare the benefits of our proposal routing protocol for CCN-based MANET with the classical routing protocols in MANET. Results show that mobile networks can be made more effective and efficient through CCN Network.

QoS improvement for multicast video streaming: A new cross-layer scheme-based mapping, scheduling and dynamic Arbitration Algorithms for Multicast Scalable Video Coding (CMSAA-MSVC)

QoS requirement is a key issue in wireless communication. Today, researchers are giving considerable interest to multicast video transmission. The legacy IEEE 802.11 WLAN standard is one of the most widely adopted technologies for delivering wireless traffic; whereas, QoS is not yet envisaged in this standard. The IEEE 802.11e (EDCA) standard is defined as the best solution to this issue. Yet, EDCA mechanism performs poorly and continues to have serious issues due to adverse condition of the wireless channel. Besides, EDCA cannot satisfy the high bandwidth that a video application requires. Recently, the 802.11aa is addressing the multicast limitation of audio and video transport stream; because EDCA needs improvements to support differentiation between video streams. The question is how to receive efficient multicast streaming video when the source node delivers simultaneously multicast and unicast flows?. This situation encourage us to design a new cross-layer scheme, based on the 802.11aa, to allow efficient and robust multicast transmission over WLAN. Our approach is called Cross-layer scheme-based Mapping, Scheduling and dynamic Arbitration Algorithms for Multicast Scalable Video Coding CMSAA-MSVC. We analyze the performance of the proposed architecture and evaluate it via simulations. Simulation results show that our approach performs better compared to the traditional EDCA mechanism and recent work in terms of E2ED and PSNR.

H.264/SVC scalability performance analysis

The H.264/SVC was developed as an extension of H.264/AVC; the latest scalable H.264 codec (SVC) provides combined temporal, quality and spatial scalability. This paper provides theoretical concepts of these different scalability approaches and analysis of their performances when video are transmitted over IEEE 802.11e WLANs. In order to validate our works, we have used an NS2 simulator environment based on SVEF (Scalable Video-Streaming Evaluation Framework). We have suggested evaluating H.264/SVC video coding over wireless network architecture, specifically when DCF or EDCA access mechanisms are used. In our analysis we have focused on Spatial, Quality, and Temporal video scalability approaches. The obtained results show that temporal scalability clearly outperforms other scalability category.

New robust decoding scheme-aware channel condition for video streaming transmission

Abstract H.264 standard, known as an efficient video codec, is still sensitive to transmission errors. This issue is achieved by several error resilience/concealment techniques, to deal with packet losses. Whereas, these typical techniques are not suited for streaming video transmission which requires high quality. In fact, since the H.264 standard provides different type of frame, these techniques don’t give high priority to I frames. Moreover, video transmission over error prone channel has increased greatly. These facts provided the necessary to propose a new technique to deal with errors in video streaming over noisy channels. In this paper, we propose a novel technique, named novel robust decoding algorithm-aware channel conditions for video streaming (denoted as RDVS). The main idea of RDVS is to estimate CAVLC sequence by exploiting the bitstream structure and the semantic property. Obtained results confirm the effectiveness of the proposed strategy which outperforms the existing state-of-the-art Robust Decoding strategies.

Delay-quality tradeoff for video streaming over MANET using network coding (DQNC)

Although, it was shown that NC is a promising technique to improve the throughput; especially for multicast environment; it also bears negative side-effects (e.g., high decoding delay). Since streaming video are usually subject to strict delay constraints, high decoding delay must be resolved to enhance the performance of the NC schemes. To overcome this issue, this paper presents a new scheme named as Quality-Delay Tradeoff for video streaming over MANET using Network Coding and denoted as DQNC. This scheme operates into two major steps: (i) the first one is processed at the source node and (ii) the second one is treated by the intermediate node that can be considered as a receiver. In comparison with our previous works (i.e, [22] [23]) simulation results show that our new scheme outperforms the existing approaches by improving the video streaming quality and decreasing its decoding delay.

New Hierarchical Parent-Child Caching Strategy (H-CS) for CCN-Based Video Streaming

Content-Centric Networking (CCN) has emerged as a future Internet communication model by replacing host addresses with named contents. Over the last years, caching at routers in CCN is attracting a lot of interest. Specially, caching of video traffic is emerging as a serious concern for CCN deployment due to the special characteristics of video streaming such as large content size and low latency requirements. In this paper, we propose a hierarchical parent-child caching strategy called H-CS in order to ensure low access latency and to reduce load on the network. Basically, each router is assigned a level-based caching indicator to guarantee higher probability content storage as closer as possible to the requesters. Performance evaluation demonstrates the effectiveness of the proposed H-CS scheme using ns-3 based NDN (named data netwok) simulator (ndnSIM). In fact, simulations show how H-CS functionality can be used to achieve efficient and reliable video dissemination including the support of delay tolerant delivery.