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Just like Ethernet before, IEEE 802.11 is now transcending the borders of its usage from the office environment toward real-time communication on the factory floor. However, similar to Ethernet, the availability of synchronized clocks to coordinate and control communication and distributed real-time services is not a built-in feature in WLAN. Over the years, this has led to the design and use of a...
Time synchronization is an essential service in many sensor network applications. Several time synchronization protocols have been proposed to synchronize the clocks on sensor nodes. All the synchronization protocols bring energy and complexity overhead to the network. There are many WSN applications which timestamp their samples with second level granularity. We claim real-time clocks can satisfy...
In the past decade, a number of solutions have appeared for industrial communication systems, which include both a wired backbone and a number of wireless extensions. Ethernet and Wi-Fi are two popular technologies that can be profitably adopted to set up this kind of networks. Although both of them feature very high throughput, the inability of Wi-Fi to tackle real-time constraints properly has undermined...
Wireless communications in the industrial automation world still suffer from lack of standardization. WirelessHART, released in September 2007, is still the only open communication standard specifically designed for real-time process control applications. This paper presents an innovative distributed tool for capturing WirelessHART packets in the field. In fact, even if tools for compliance assessment...
This paper proposes an idiographic implement scheme of MPEG-4 real-time video streaming for multi-channel based on RTP/RTCP over WLAN. It also proposes an effective synchronistic model for multi-channel video based on timestamp synchronization. Aiming at the wireless QoS mechanism, this system applies to an ECN algorithm based on RTCP feedback rate control algorithm-TFRC. The ECN algorithm improves...
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