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This paper presents Glossy, a novel flooding architecture for wireless sensor networks. Glossy exploits constructive interference of IEEE 802.15.4 symbols for fast network flooding and implicit time synchronization. We derive a timing requirement to make concurrent transmissions of the same packet interfere constructively, allowing a receiver to decode the packet even in the absence of capture effects...
The International Society of Automation has recently released ISA100.11a as a standard for reliable and security application in industrial application, in addition to be compatible with existing wired and wireless networks. ISA100.11a, like WirelessHART, uses TDMA scheme in medium access layer to provide deterministic services. However ISA100.11a adopts the CSMA-CA mechanism with priorities for, e...
Precision Time Protocol (PTP) is a high precision time synchronization protocol designed to run over a local area network. PTP, often referred to as 1588, is defined by the IEEE Standard 1588™-2008. The protocol theoretically allows synchronization at the nanosecond level. In this project we study the performance of the protocol in an environment where multiple 1588 devices are connected via a network...
IEEE 802.1AS includes a very specific profile of IEEE 1588 that only runs at layer 2 over networks that follow the IEEE 802 architecture. It has some significant performance and scalability advantages, but at the cost of not allowing non-PTP-aware devices. This paper describes how a network having a common source of time can act as a distributed IEEE 1588 boundary, ordinary, or transparent clock,...
In distributed environments, the coordination of distributed entities and events requires time synchronization. Precision time synchronization supports a variety of extensions of applications. The IEEE 1588 precision time protocol (PTP) provides a standard method to synchronize devices in a network with sub-microsecond precision. This paper includes the design and implementation of a PTP bridge to...
This paper presents part of the experimental results obtained during the French national research project GRACE, which deals with opportunistic cognitive radio and spectrum management. The consortium, composed by French big- and small-size companies and research institutes, proposes a cognitive orthogonal frequency division multiplexing (OFDM) signal based on IEEE 802.16e standard, with time-windowing...
Broadcasting of digital video signals uses large spectral area. In order to reduce the cost, broadcasters are optimizing their radio network. They build single frequency network (SFN). To maintain efficient quality of service (QoS) to the end user, accurate time synchronization and frequency syntonization is needed between transmitter sites. This function is now fulfilled with local GPS slaved clocks...
Ethernet is increasingly being used in carrier networks to transport real-time traffic, including wireless backhaul network traffic, time-sensitive audio/video applications in access networks, and circuit emulation for legacy services. With the replacement of traditional circuit-switched networks with Ethernet-based packet networks, it must be ensured that the application timing and QoS requirements...
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