Telemed J E Health - Remote patient monitoring based on ZigBee: lessons from a real-world deployment.

Tópicos

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Resumo

M: This work presents detailed experimental performance results from tests executed in the hospital environment for Health Monitoring for All (HM4All), a remote vital signs monitoring system based on a ZigBee? (ZigBee Alliance, San Ramon, CA) body sensor network (BSN).MATERIALS AND METHODS: Tests involved the use of six electrocardiogram (ECG) sensors operating in two different modes: the ECG mode involved the transmission of ECG waveform data and heart rate (HR) values to the ZigBee coordinator, whereas the HR mode included only the transmission of HR values. In the absence of hidden nodes, a non-beacon-enabled star network composed of sensing devices working on ECG mode kept the delivery ratio (DR) at 100%.RESULTS: When the network topology was changed to a 2-hop tree, the performance degraded slightly, resulting in an average DR of 98.56%. Although these performance outcomes may seem satisfactory, further investigation demonstrated that individual sensing devices went through transitory periods with low DR. Other tests have shown that ZigBee BSNs are highly susceptible to collisions owing to hidden nodes. Nevertheless, these tests have also shown that these networks can achieve high reliability if the amount of traffic is kept low. Contrary to what is typically shown in scientific articles and in manufacturers' documentation, the test outcomes presented in this article include temporal graphs of the DR achieved by each wireless sensor device.CONCLUSIONS: The test procedure and the approach used to represent its outcomes, which allow the identification of undesirable transitory periods of low reliability due to contention between devices, constitute the main contribution of this work.

Resumo Limpo

m work present detail experiment perform result test execut hospit environ health monitor hmall remot vital sign monitor system base zigbe zigbe allianc san ramon ca bodi sensor network bsnmateri method test involv use six electrocardiogram ecg sensor oper two differ mode ecg mode involv transmiss ecg waveform data heart rate hr valu zigbe coordin wherea hr mode includ transmiss hr valu absenc hidden node nonbeaconen star network compos sens devic work ecg mode kept deliveri ratio dr result network topolog chang hop tree perform degrad slight result averag dr although perform outcom may seem satisfactori investig demonstr individu sens devic went transitori period low dr test shown zigbe bsns high suscept collis owe hidden node nevertheless test also shown network can achiev high reliabl amount traffic kept low contrari typic shown scientif articl manufactur document test outcom present articl includ tempor graph dr achiev wireless sensor deviceconclus test procedur approach use repres outcom allow identif undesir transitori period low reliabl due content devic constitut main contribut work

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