Presentation on theme: "IHE PCD – Use Cases Patient Care Device Controls – Frequency Response "Spectrum" Rev1 14Dec05 JW."— Presentation transcript:
IHE PCD – Use Cases Patient Care Device Controls – Frequency Response "Spectrum" Rev1 14Dec05 JW
Based on ISO/IEEE (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
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 P RF Wireless Guide project UseMatrix.xls.
Figure 2. Variations in Control Freq Response Low-latency variations Effect of scaling up is higher effective frequency of LAN- based remote controls Relatively hi- freq, low- latency machine- machine controls
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