New wireless sensor network applications (e.g., military surveillance) require higher reliability than a simple best effort service could provide. Classical reliable transport protocols like Transmission Control Proto...New wireless sensor network applications (e.g., military surveillance) require higher reliability than a simple best effort service could provide. Classical reliable transport protocols like Transmission Control Protocol (TCP) are not well suited for wireless sensor networks due to both the characteristics of the network nodes (low computing power, strong energy constraints) and those of the main applications running on those nodes (low data rates). Recent researches present new transport protocols for wireless sensor networks providing various type of reliability and using new mechanisms for loss detection and recovery, and congestion control. This paper presents a survey on reliable transport protocol for WSNs.展开更多
This paper presents a streaming system using scalable video coding based on H.264/AVC. The system provides a congestion control algorithm supported by channel bandwidth estimation of the client. It uses retransmission...This paper presents a streaming system using scalable video coding based on H.264/AVC. The system provides a congestion control algorithm supported by channel bandwidth estimation of the client. It uses retransmission only for packets of the base layer to disburden the congested network. The bandwidth estimation allows for adjusting the transmission rate quickly to the current available bandwidth of the network. Compared to binomial congestion control, the proposed system allows for shorter start-up times and data rate adaptation. The paper describes the components of this streaming system and the results of experiments showing that the proposed approach works effectively for streaming video.展开更多
基于Android 2.3.1设计并实现了实时视频流传输系统。视频数据压缩算法采用H264,数据传输使用点对点P2P(Peer to Peer)。系统分两个层次,底层使用C++实现RTP封装与解包、P2P网络传输、视频采集与编解码等;上层使用Java实现对界面的控制...基于Android 2.3.1设计并实现了实时视频流传输系统。视频数据压缩算法采用H264,数据传输使用点对点P2P(Peer to Peer)。系统分两个层次,底层使用C++实现RTP封装与解包、P2P网络传输、视频采集与编解码等;上层使用Java实现对界面的控制。Java界面层通过JNI(Java native interface)调用C++接口,上下层之间无视频数据的拷贝操作,提高了系统性能。同时,设计实现解码错误弹回策略,根据解码错误反馈信息,了解当前网络拥塞情况,灵活调整帧率和压缩图像分辨率。系统在4台三星S5PV210开发板上的运行效果良好。该系统可以作为视频会议、监控系统等的参考或组成部分。展开更多
文摘New wireless sensor network applications (e.g., military surveillance) require higher reliability than a simple best effort service could provide. Classical reliable transport protocols like Transmission Control Protocol (TCP) are not well suited for wireless sensor networks due to both the characteristics of the network nodes (low computing power, strong energy constraints) and those of the main applications running on those nodes (low data rates). Recent researches present new transport protocols for wireless sensor networks providing various type of reliability and using new mechanisms for loss detection and recovery, and congestion control. This paper presents a survey on reliable transport protocol for WSNs.
文摘This paper presents a streaming system using scalable video coding based on H.264/AVC. The system provides a congestion control algorithm supported by channel bandwidth estimation of the client. It uses retransmission only for packets of the base layer to disburden the congested network. The bandwidth estimation allows for adjusting the transmission rate quickly to the current available bandwidth of the network. Compared to binomial congestion control, the proposed system allows for shorter start-up times and data rate adaptation. The paper describes the components of this streaming system and the results of experiments showing that the proposed approach works effectively for streaming video.
