Oh Chan Kwon

An Energy-Efficient HTTP Adaptive Video Streaming With Networking Cost Constraint Over Heterogeneous Wireless Networks

This paper presents a seamless high-quality HTTP adaptive streaming algorithm that considers wireless network conditions and the energy consumption of a mobile device with networking cost constraints over heterogeneous wireless networks. In the proposed algorithm, the requested video segments are concurrently delivered through multiple wireless networks to overcome the limitations of a single network. The segment quality level, number of requested segments, network inactive interval, and amount of requested data through each wireless network are determined adaptively in order to provide a seamless high-quality video with low energy consumption and networking cost constraints at the mobile device. The proposed algorithm is fully implemented in an Android-based mobile device and tested in an actual wireless network environment.

MPMTP: Multipath Multimedia Transport Protocol using Systematic Raptor Codes over Wireless Networks

This paper presents a multipath multimedia transport protocol (MPMTP), which exploits path diversity over heterogeneous wireless networks. The goal of MPMTP is to provide a seamless high-quality video streaming service by using multiple wireless networks simultaneously. In MPMTP, systematic Raptor codes are adopted to mitigate video quality degradation caused by wireless channel errors as well as to alleviate a head-of-line blocking problem in multipath environments, and their encoding parameters such as code rate, symbol size, and the number of source symbols are determined on the fly by considering the wireless channel state, Raptor encoding and decoding complexity, and receiver buffer occupancy. Furthermore, MPMTP performs packet scheduling considering not only wireless network conditions but also packet payload characteristics for smooth video playback. The proposed MPMTP is fully implemented in a Linux kernel and examined over real wireless network environments.

An Energy-Efficient Multimedia Streaming Transport Protocol Over Heterogeneous Wireless Networks

This paper presents an energy-efficient multipath streaming transport protocol to support a seamless high-quality video streaming service over heterogeneous wireless networks. The proposed protocol employs raptor codes to alleviate video quality degradation caused by wireless channel errors and the diverse characteristics of wireless networks. Furthermore, it is designed to reduce the energy consumption of a mobile device because more energy is generally consumed to activate multiple wireless networks and perform supplementary raptor decoding. For energy saving at the receiver side, the proposed protocol not only shapes a video stream but determines the raptor encoding parameters such as code rate, symbol size, and the number of source symbols as well, while considering the energy consumption of on-the-fly raptor decoding. The proposed protocol is fully implemented using C/C++ and Java on an Android-based smartphone and examined over real heterogeneous wireless networks. The proposed protocol can achieve good energy efficiency while providing a seamless high-quality video streaming service compared with existing protocols.

Entire network load-aware cooperative routing algorithm for video streaming over mobile ad hoc networks

In this paper, we present an entire network load-aware cooperative routing algorithm based on IEEE 802.11 multi-rate for video streaming over mobile ad hoc networks. The proposed routing algorithm is designed to minimize the consumed time slots while guaranteeing the required time slots at all the pairs of adjacent nodes over the route and the contention neighbors of these nodes to support the route. Furthermore, the proposed routing algorithm can distribute the network loads well over the entire network. This technology is essential because video streaming applications require stringent quality of service and even larger network resources compared with traditional data services, and these demands may dramatically increase the entire network load and/or cause network congestion. Finally, experimental results are provided to show a performance of the proposed routing algorithm. Copyright

Adaptive tree-based P2P video streaming multicast system under high peer-churn rate

This paper presents an adaptive tree-based P2P video streaming multicast system under high peer-churn rate. Because peers typically display dynamic and unstable behavior during the session, a P2P video streaming multicast tree must take into account both the link delay and peer stability in order to provide a seamless video streaming multicast service with low delay. Hence, we need to adaptively update the multicast tree according to its time-varying environments in order to obtain an effective tradeoff between the delay of the tree and the relative peer stability over multicast tree. Finally, simulation results are provided to demonstrate the performance of the proposed system.

A robust LT-codes-based P2P multicast system for video streaming over wireless networks

In this work, we propose a robust Luby transform (LT)-codes-based mobile peer-to-peer (P2P) video multicast system. The proposed system adopts LT codes to handle the effect of lost packets over wireless networks efficiently and to simplify the exchange of buffer map information, as well as a push-pull delivery mechanism to transmit LT encoding symbols, which are required for successful decoding, to all the participating peers on time with minimal overall redundancy. The proposed system is designed to pursue an efficient tradeoff between delay and the amount of redundancy by controlling the code rate of LT codes.

A peer-churn resistant video multicast system over P2P networks

This work presents a peer-churn resistant video multicast system over P2P (Peer-to-Peer) networks. Because peers typically display dynamic and unstable behavior during a session, a P2P video streaming multicast tree must take into account both the link delay and the peer stability in order to achieve a seamless video streaming multicast service with a low delay. Hence, we need to update the multicast tree dynamically according to its time-varying environments in order to achieve an effective tradeoff between the route delay and the relative peer stability. Finally, simulation results are provided to demonstrate the performance of the proposed system.

A robust P2P video multicast streaming system under high peer-churn rate

This work presents a robust P2P video multicast streaming system when peers dynamically leave and join the multicast session. While constructing a multicast tree, we take into account not only the link delay, but also peer stability since peers show unpredictable and unstable behavior over P2P networks. Furthermore, we adaptively control the weighting factor between the link delay and peer stability to achieve an effective trade-off between these two factors. In essence, we employ Genetic algorithm to obtain a near optimal solution with low computational complexity. Finally, simulation results are provided to show the performance of the proposed system.

Systematic Raptor Codes-Based Multipath Multimedia Transport Protocol over HetNets

This work presents a multipath multimedia transport protocol (MPMTP), which exploits path diversity over heterogeneous wireless networks. The goal of MPMTP is to provide a seamless high-quality video streaming service by using multiple wireless networks simultaneously. In MPMTP, systematic Raptor codes are adopted to mitigate video quality degradation caused by wireless channel errors, as well as to alleviate a head-of-line blocking problem in multipath environments, and their encoding parameters such as code rate, symbol size, and the number of source symbols are determined on the fly by considering the wireless channel state, Raptor encoding and decoding complexity, and receiver video buffer occupancy. Furthermore, MPMTP performs packet scheduling considering not only wireless network conditions but also packet payload characteristics for smooth video playback. The proposed MPMTP is fully implemented in a Linux kernel and examined over real wireless network environments.

Energy-efficient HTTP adaptive streaming for high-quality video over HetNets

In this work, we propose an energy-efficient HTTP adaptive streaming for high-quality video over heterogeneous networks (HetNets). To support high-quality video and overcome the limitations of a single network, the proposed system downloads the video segments by concurrently using the HetNets. In the proposed system, the segment bitrate, number of requested segments, network sleep time, and size of requested data through each wireless network are determined adaptively to provide seamless high-quality video streaming in an energy and cost efficient way. The proposed system is fully implemented in an Android-based mobile device and tested in an actual wireless network environments.