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In this paper, TA-ARQ (Time-constrained Aggregated Automatic Repeat-reQuest) with an adaptive rate control for SVC streaming based on HDP transport protocol is proposed. To meet the requirement of terminal equipment in the heterogeneous network environments, we consider SVC for different applications. Selected NALUs (Network Abstraction Layer Units) are sent according to the quality estimation of...
When a mobile host transmitting real-time video traffic using DCCP CCID3 moves between two wireless LAN access points with different congestion situations, it is difficult to quickly change the transmission rate according to the changes of communication environment because controlling the sending rate depends on feedback information. To solve this problem, we recently proposed a predictive rate control...
In this paper, a video streaming system for education based on wireless mesh network is proposed. Wireless mesh network is a self-organizing, self-managing and reliable intelligent network which allows educators to deploy a network quickly whenever there is a need. Video streaming plays an important role in this system for multimedia data transmission. This new system adopts the scalable video coding...
In this paper we investigate the interaction of channel code and modulation (i.e., the bitrate) of wireless transmissions and application layer forward error correction in the context of media streaming. To this end, we design a multimedia delivery protocol based on systematic network coding with partial feedback for reliable broadcast streaming over WLANs. Differently from other work, our approach...
Nowadays, wireless networks have been deploying everywhere, with IEEE 802.11 as the most popular standard. However, wireless resources are scarce and wireless condition varies often. These limitations are crucial for applications with tight QoS requirements such as video or voice over IP. To cope with the problems, the standard has provided many features including multi-rate capability, which is the...
IEEE 802.11 protocol has found wide acceptability in the past few years, especially in embedded devices. Some of the embedded devices supporting 802.11 interfaces are voice and video-based devices like cordless phones, music players, camcorders, etc. These devices work in ad-hoc mode of operation for a number of applications. Such applications have some mandatory requirements that require one to determine...
We developed a simulation set-up that can test the behaviour of streaming applications over an error-prone wireless networks: 802.11b/g specifically. The application we tested is a video coder that adds unequal error protection to the scalable extension of H.264/SVC. This protection mechanism enables the recovery of lost packets. We adapted a radio wave propagation model to define Rayleigh fading...
We analyze and compare various transport protocols in the context of wireless in-vehicle IP-based audio and video communication. We determine the most appropriate transport protocol and discuss its benefits for an application in the car. The analyses are accomplished based on the IEEE 802.11 standard. A testbed is used to measure and compare quality of service values such as throughput, jitter and...
Stream control transmission protocol (SCTP) is a transport layer protocol for the next-generation Internet. In this paper, we investigate optimally condition for MPEG 4 video communication with SCTP in 802.11 wireless access media. We focus on the multi-streaming feature and the partial reliability extension in SCTP and compare performance of MPEG4 video quality under the policy w th/without differentiated...
This contribution addresses the case when live packet-switched video is used to enrich circuit-switched speech calls in mobile telephony. Circuit-switched and packet-switched transmissions generally operate on completely different transmission paths resulting in different QoS in terms of delay and loss rates. In this case, video and audio data recorded at the same time are not multiplexed together...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
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