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Several communication protocols based on channel hopping have been proposed for wireless sensor networks. One prominent example is IEEE 802.15.4e, which relies on the concept of time-slotted channel hopping (TSCH). TSCH effectively mitigates poor channel conditions (caused, e.g., by fading) by means of channel changes according to a pre-defined hopping sequence. In order for nodes to participate in...
The paper presents an indoor testbed evaluation of a multi-hop IEEE 802.15.4e Time Slotted Channel Hopping (TSCH) sensor network, operating in 2.4 GHz band. First goal of the evaluation is to assess the perspectives of TSCH, as a more reliable version of IEEE 802.15.4, for meter reading applications in a Smart Grid. Secondly, we compare the network performance for two medium access schemes: contention-based...
Many embedded wireless systems can benefit from causal and totally ordered communication (CATOC) in order to achieve reliability and logical consistency at the application level. In this paper, we present a sequencer-based CATOC protocol designed to exploit the physical broadcast capability of wireless interfaces. Under ideal conditions, the propagation and delivery of an application message to the...
An important aspect of any communication technology is its medium access method, being responsible for sharing the medium among users. For delay-sensitive applications, such as industrial control systems, timely and reliable channel access is of essence. Hence, existing protocols like HART and TTEthernet use a time-triggered medium access approach. However, as the nature of industrial control systems...
Over the past decade, advances in electronics, computer science, and wireless technologies have brought Wireless Body Area Network (WBAN) into many interesting applications. Particularly for the healthcare application, reliability is considered as a very important aspect for WBAN. Being the main focus of this paper, we aim at improving reliability by reducing the collision rate and increasing the...
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