Receiving data in a sensor network
a sensor network and data technology, applied in data switching networks, transmission monitoring, frequency-division multiplexes, etc., can solve problems such as more expensive, and achieve the effect of reducing the average data rate and better handling sudden bursts of traffi
Inactive Publication Date: 2006-11-23
IBM CORP
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[0007] The present invention provides a sensor network for lower average data-rates, which is able to better handle sudden bursts of traffic. According to a first aspect of the present invention there is provided a method for receiving data packets from a plurality of transmitting devices at a receiving device, comprising: sensing data packets transmitted on a communication medium; estimating the total traffic intensity of data packets generated by the transmitting devices; setting a detection threshold for receiving data packets as a function of the total traffic intensity; ignoring data packets with a received signal strength below the detection threshold; and receiving data packets with a received signal strength above the detection threshold.
[0008] According to a second aspect of the present invention there is provided a receiving device for receiving data packets from a plurality of transmitting devices, comprising: a receiving circuit for receiving data packets with a received signal strength above a current detection threshold; estimator for the total traffic intensity of data packets generated by transmitting devices; controller for setting the detection threshold for receiving data packets as a function of the total traffic intensity.
[0009] According to a third aspect of the present invention there is provided
Problems solved by technology
Since there are much fewer CHs than SNs, they can be more
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[0021] The present invention provides methods, apparatus and systems for a sensor network for lower average data-rates, that are able to better handle sudden bursts of traffic. A goal of improved cluster head design is to increase the number of captured packets. There are two different traffic cases, one being referred to as low network traffic, the other as high network traffic. The distinction between these two cases can be made by defining an intensity threshold. For example low network traffic could be defined as the case when portion of time that a cluster head does not sense a packet transmission is larger than the time during which it does sense a packet transmission. In contrast thereto then high network traffic might be defined as the case when the portion of time that a cluster head does not sense a packet transmission is shorter than the time during which it does sense a packet transmission. There can be used other definitions, for instance those that define the intensity...
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A sensor network has a plurality of wireless sensors which transmit to an intermediate receiving device which relays data to a central server. A method is provided for receiving data packets at the intermediate receiving device from a plurality of the transmitting devices. Data packets are sensed on a communication medium at the receiving device and the total traffic intensity of data packets from the transmitting devices is estimated. A detection threshold for data packets is provided and adapted as a function of the total intensity. The receiving device receives data packets with a signal strength above the current detection threshold.
Description
TECHNICAL FIELD [0001] This invention relates to the field of receiving data in a sensor network and it particularly relates to cluster head design in transmit-only wireless sensor networks. BACKGROUND OF THE INVENTION [0002] There has been a recent increase in demand for wireless sensor networks, due to their simplicity, low cost and easy deployment. Wireless sensor networks can serve different purposes, from measurement and detection, to automation and process control. [0003] A typical wireless sensor network consists of sensor nodes (SNs) and sinks. SNs are wireless nodes equipped with sensing devices whose goal is to gather data in the environment and transmit it to a central server. It is advantageous if the transmission is wireless, since the number of sensors is typically very large, and the cost of deployment of a wired infrastructure would be more expensive. [0004] In order to have a longer lifetime, SNs typically use smaller transmission powers. The area covered by a senso...
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Login to view more IPC IPC(8): H04L12/26H04J1/16
CPCH04W24/00H04W28/18H04L67/12H04W88/04H04W84/18H04L12/413H04W88/16H04B17/318
Inventor RADUNOVIC, BOZIDARTRUONG, HONG LINH
Owner IBM CORP
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