Abstract
In the paper a discussion on how to optimize LonWorks/EIA-709 sensornetworking technology for wireless applications, in presented. Main solutions offered byLocal Operating Networks (LON, LonWorks) platform attractive for wirelesscommunication, that is, the send-on-delta concept and the sleep mode, are displayed. Thepredictive p-persistent CSMA MAC protocol constituting the heart of the communicationcapability of LON networks is analysed in detail. Next, the message services are described,and the analytical evaluation of delivery reliability is derived. Performance evaluation basedon simulation results for unicast traffic is presented first. In order to highlight the robustnessof the predictive CSMA to overload situations, the saturation performance for a general caseload scenario including multicast transactions is reported. The methods of effectivemanagement of energy consumption in LonWorks networks are discussed. Finally, the LONdesign tradeoffs are summarized.
Highlights
Local Operating Networks (LON, LonWorks) is a name of one of the leading technologies in sensor/control networking, addressed to a wide range of applications
We present the key characteristics of the predictive p-Carrier Sense Multiple Access (CSMA) protocol, that is, the channel throughput, the collision rate, and the mean access delay against the offered traffic for the selected number of nodes
In the idealized channel without collision detection, the size of the competition window does not depend on the number of contending nodes, but on the structure of the input traffic generated to the network, that is, the proportion between unicast/multicast transactions and unacknowledged/acknowledged message service
Summary
Local Operating Networks (LON, LonWorks) is a name of one of the leading technologies in sensor/control networking, addressed to a wide range of applications. LonWorks smart sensor nodes monitor a state of the environment being sensed according to send-on-delta concept rather than periodically [2]. The use of send-on-delta technique instead of the traditional time-triggered updates reduces the mean rate of messages generated by a sensor node [8]. Unlike in most wireless sensor networking technologies, the energy consumption is not the main constraint in LonWorks design since the batteries, powering devices, are in general replaceable. Unlike dense wireless sensor networks that are used commonly in environmental monitoring, LonWorks technology has not been designed for detection of event of interest at the same time by a large number of nodes in a sensor field.
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