Download - IHE PCD – Use Cases Patient Care Device Controls – Frequency Response "Spectrum" Rev1 14Dec05 JW
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IHE PCD – Use Cases
Patient Care Device Controls – Frequency Response "Spectrum"
Rev1 14Dec05 JW
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• Based on ISO/IEEE 1073 .0 (P.1.1 RF Wireless Guide) .1 (.1.1 Nomenclature, .2.1 DIM) .2 ( P.3.1 Remote Control Pkg) for representative variety of control types
• Adapted relational DB from IEEE 1073 “Demo” project• Used for VS Monitor/Infusor/Ventilator “Demo” project (2002-3)
• Adapted for ORF harmonization (2004-5)
• Adapted for CAN harmonization (2005) based on recently developed “Injector” application/standard
• Generated Ctls Freq-Response graphics from spreadsheet tool, sorting on decreasing latency then increasing frequency [inter-Control period] based on single PoC use context
• latency estimates may need to be empirical based on accuracy rqmts• other data types, scalability, network type, fault-tolerance, etc., may need to be modeled
Methodology
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Figure 1. Variations in Effective Throughput
In this model, various classical data types are modeled message sequences from transactions that occur stochastically. In this model, for example, a “Near RT” Wave” transaction is a continuous, periodic process, typically generating several-to-tens of packets per second (Pps), while a “Chart” transaction is an intermittent, aperiodic process, typically generating a burst of graphical, tabular data as the user opens or scrolls through the patient flowsheet. Fault-tolerance is modeled by including nominal bit error and packet retry rates, characteristic of RF wireless networks.
Source: IEEE P1073.0.1.1 “RF Wireless Guide” project “UseMatrix.xls”.
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Figure 2. Variations in Control Freq Response
Low-latency variations
Effect of scaling up is higher effective
frequency of LAN-based “remote”
controlsRelatively hi-
freq, low-latency
machine-machine controls
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Table 1. Related attributes for Controls messaging
Retries tend to increase latency constraints and complexity, esp.
on WLAN
Various medical device-sourced or –destined [remote]
controls
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