排序方式: 共有99条查询结果,搜索用时 500 毫秒
11.
12.
uIP协议栈是一种免费的极小型TCP/IP协议栈,可用于8位或16位微处理器构建的嵌入式系统。丈中提出了一种基于uIP协议栈的光设备网络接入模块的设计方案。该网络接入模块是廉价的测控网络接入方案,它可以将带RS-232等接口的测控设备简单而直接地连接在局域网上,然后利用丰富现成的局域网资源,组成一系列基于局域网的分布式测控系统。 相似文献
13.
移动网络结构日趋复杂,网络场景多样化,影响用户体验的因素也越来越难以判断。结合SEQ平台系统,通过调整上行调度算法参数中"上行HARQ最大传输次数"参数,增大UE配置的最大传输次数,提高数据包传输成功率,降低信道编码率,提高解码效果,以降低HTTP页面打开时延。通过试验区优化验证,该措施能有效降低HTTP页面的各项时延。 相似文献
14.
Andrea Cardaci Luca Caviglione Erina Ferro Alberto Gotta 《International Journal of Satellite Communications and Networking》2017,35(4):307-321
During the last decade, the Web has grown in terms of complexity, while the evolution of the HTTP (Hypertext Transfer Protocol) has not experienced the same trend. Even if HTTP 1.1 adds improvements like persistent connections and request pipelining, they are not decisive, especially in modern mixed wireless/wired networks, often including satellites. The latter play a key role for accessing the Internet everywhere, and they are one of the preferred methods to provide connectivity in rural areas or for disaster relief operations. However, they suffer of high‐latency and packet losses, which degrade the browsing experience. Consequently, the investigation of protocols mitigating the limitations of HTTP, also in challenging scenarios, is crucial both for the industry and the academia. In this perspective, SPDY, which is a protocol optimized for the access to Web 2.0 contents over fixed and mobile devices, could be suitable also for satellite links. Therefore, this paper evaluates its performance when used both in real and emulated satellite scenarios. Results indicate the effectiveness of SPDY if compared with HTTP, but at the price of a more fragile behavior when in the presence of errors. Besides, SPDY can also reduce the transport overhead experienced by middleboxes typically deployed by service providers using satellite links. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
15.
16.
17.
18.
一种基于HTTP的Internet文件存储系统的设计和实现 总被引:1,自引:0,他引:1
利用网络进行文件管理,尤其是利用范围最广的Internet网络进行存储管理,能极大地方便和满足用户文件存储管理的需要.论述了一种基于HTTP的Internet文件存储系统的设计和实现. 相似文献
19.
Miran Taha Jaime Lloret Aree Ali Laura Garcia 《International Journal of Communication Systems》2018,31(9)
Hypertext Transfer Protocol adaptive streaming switches between different video qualities, adapting to the network conditions, and avoids stalling streamed frames over high‐oscillation client's throughput improving the users' quality of experience (QoE). Quality of experience has become the most important parameter to lead the service providers to know about the end‐user feedback. Implementing Hypertext Transfer Protocol adaptive streaming applications to find out QoE in real‐life scenarios of vast networks becomes more challenging and complex task regarding to cost, agile, time, and decisions. In this paper, a virtualized network testbed to virtualize various machines to support implementing experiments of adaptive video streaming has been developed. Within the test study, the metrics which demonstrate performance of QoE are investigated, respectively, including initial delay (ie, startup delay at the beginning of playback a video), frequency switches (ie, number of times the quality is changed), accumulative video time (ie, number and length of stalls), CPU usage, and battery energy consumption. Furthermore, the relation between effective parameters of QoS on the aforementioned metrics for different segment length is investigated. Experimental results show that the proposed virtualized system is agile, easy to install and use, and costs less than real testbeds. Moreover, the subjective and objective performance studies of QoE evaluation in the system have proven that the segment lengths of 6 to 8 seconds were faired and more efficient than others according to the investigated parameters. 相似文献
20.
HTTP adaptive streaming (HAS) has become the standard for adaptive video streaming service.In changing network environments,current hardcoded-based rate adaptation algorithm was less flexible,and it is insufficient to consider the quality of experience (QoE).To optimize the QoE of users,a rate control approach based on Q-learning strategy was proposed.the client environments of HTTP adaptive video streaming was modeled and the state transition rule was defined.Three parameters related to QoE were quantified and a novel reward function was constructed.The experiments were employed by the Q-learning rate control approach in two typical HAS algorithms.The experiments show the rate control approach can enhance the stability of rate switching in HAS clients. 相似文献