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Chapter 11
11-1 OVERVIEW
11-1-1 DATA CHARACTERISTICS
Personal healthcare devices, due to their nature, may need to send data in 3 different ways:
11
■
Episodic: Data is sent sporadically each time user accomplishes a specific action.
■
Store and forward: data is collected and stored on device while it is not connected. The
data is then forwarded to the host once it is connected.
■
Continuous: Data is sent continuously to the host for continuous monitoring.
Considering these needs, data transfers will be defined in terms of latency and reliability.
PHDC defines three levels of reliability and four levels of latency:
■
Reliability: Good, better and best.
■
Latency: Very-high, high, medium and low.
For example, a device that sends continuous data for monitoring will send them as low
latency and good reliability.
PHDC does not support all latency/reliability combinations. Here is a list of supported
combinations:
■
Low latency, good reliability.
■
Medium latency, good reliability.
■
Medium latency, better reliability.
■
Medium latency, best reliability.
■
High latency, best reliability.
■
Very high latency, best reliability.
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