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ABSTRACT: The dynamic characteristics of wireless networks and stringent QoS requirements of multimedia applications identify significant
challenges for providing QoS guarantees for real-time multimedia streaming in such wireless environment. QoS routing protocols
can decisively contribute to the QoS provision of network systems. This paper proposes an efficient cluster-based routing
protocol (ECBRP) for real-time multimedia streaming in mobile ad hoc networks. First, to improve the stability of clusterheads, we introduce a new algorithm of cluster formation, in consideration
of the node mobility and connectivity. Second, a link-broken detection mechanism is designed, which is able to distinguish
whether packet loss is due to mobility or congestion, and to make proper reaction. This mechanism contributes to reduce route
overhead, and to increase the decodable ratio of video frame at the application layer as well. Third, the routing protocol
is enhanced via an adaptive packet salvage strategy, in order to alleviate the congestion in consideration of the characteristics
of multimedia traffic. Our simulation experiment results demonstrate that the ECBRP leads to more stable cluster formation
than the CBRP, and 80% decreases in the frequency of clusterhead changes against CBRP. As a result, the quality of real-time
multimedia streaming is improved significantly, in terms of decodable frame ratio, delay and delay jitter, etc.
KeywordsMobile ad hoc networks–Routing protocol–Clustering–Multimedia streaming
Wireless Personal Communications 05/2012; 61(2):283-302. · 0.46 Impact Factor
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Journal of the Chinese Institute of Engineers. 07/2010; 33(5):761-768.
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ABSTRACT: This paper proposes an adaptive queue management mechanism (AQM) based on bandwidth estimation for real-time multimedia streaming over mobile ad hoc networks. The purpose is to provide the soft QoS guarantee. At first, we use GM (1, 1) model to predict network bandwidth. On this basis, a mathematical model is proposed to determine a reasonable queue length, thus adjusting the queue length dynamically. To evaluate the AQM performance, we generate a set of video streams using NS2 simulation for typical network scenarios. Our statistical and mathematical analyses demonstrate that the AQM improves the performance of multimedia streaming significantly, in terms of packet loss rate and mean end-to-end delay.
Wireless Communications, Networking and Mobile Computing, 2009. WiCom '09. 5th International Conference on; 10/2009
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ABSTRACT: This paper proposes an enhanced adaptive forward error correction (EAFEC) algorithm based on cross- layer design for wireless media streaming, in the hope that the media could be played on receivers with high quality. This algorithm, which uses the Poisson process to predict the current network condition, can adjust the sending rate of MPEG video frame adaptively and allocate the network bandwidth resource between MPEG video source data and redundant data dynamically. Our mathematical analyses and simulation results show that EAFEC mechanism achieves better quality of media streaming comparing with original FEC, in terms of playable frame rate, reliability and real-time performance on the receiver.
Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on; 11/2008
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ABSTRACT: Real-time media streaming in wireless network has seen increased demand on the Internet in recent years, and has drawn tremendous attention from both academia and industry as well. Preliminary traffic measurements demonstrate that data traffic in wireless communication also exhibits self-similarity. However, little research on wireless media streaming is seen in publication. The purpose of this paper is to characterize video streaming traffic over multi-hop wireless local area networks. We begin with an investigation of the video streaming data generated using NS simulation for two typical network scenarios. On this basis, we proposed a new gamma distribution based wavelet model for wireless video traffic. Our mathematical analyses show that this model can capture all traffic characteristics of wireless video streaming, including traffic arrival and self-similarity.
Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on; 11/2008
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ABSTRACT: This paper proposes a cross-layer based power-aware multipath routing protocol (CPMRP) for wireless mobile ad hoc networks. The nodes' mobility behavior is predicted using a notion of "signal fading degree, SFD". On the other hand, loop-freedom guarantee is provided by "signal identifier, SI". Especially, in combination of the IEEE802.11e standard at the MAC layer, we determine that the IEEE802.11e makes a significant contribution to performance improvement of CPMRP. The purpose of this work is to ensure both network performance improvement and power efficiency. Our simulation results show that CPMRP decreases the average end-to-end delay, routing overhead, packet loss significantly, as well as reduces power consumption to some extent. The improvement in end-to-end delay is more pronounced.
Communications and Networking in China, 2008. ChinaCom 2008. Third International Conference on; 09/2008
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ABSTRACT: This paper proposes a link-level hybrid FEC/ARQ based on an adaptive forward error correction (adaptive FEC) algorithm for wireless media streaming, in the hope that the media could be played on receivers with high quality. This model, which uses adaptive forward error correction mechanism at the application layer to adjust to the current network condition, can maximize the performance of wireless multimedia communication. Our simulation results and mathematical analysis show that the hybrid FEC/ARQ achieves better quality of media streaming comparing with FEC alone and ARQ alone, in terms of playable frame rate, reliability and real-time performance on the receiving side.
Circuits and Systems for Communications, 2008. ICCSC 2008. 4th IEEE International Conference on; 06/2008
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IJCNS. 01/2008; 1:329-338.
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ABSTRACT: This paper proposes a cross-layer design-based, multi-path routing protocol (CMRP) for mobile ad hoc networks. In combination of the upcoming IEEE802.11e standard in MAC sublayer, we determine that CMRP benefits from this new technology significantly. Performance evaluation of AODV in legacy 802.11 and CMRP in IEEE802.11e shows that, as a function of speed of node mobility, a tremendous reduction achieved, in metrics such as the average end-to-end delay, routing overheads, route discovery frequency and normalized routing load with CMRP - almost more than 80%, 40%, 40%, and 40%. In the case of varying number of sessions, the reduction for route discovery frequency, normalized routing load and average hopcounts of active routes are up to 70%, 80%, and 50%.
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on; 10/2007
