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Overview
These combinations are called quality of service (QoS).
QoS
(Latency / reliability)
Low / good
Latency
< 20ms
Raw info
rate
50 bits/sec to
Transfer
direction(s)
IN
Typical use
Real-time monitoring, with fast
1.2M bits/sec
analog sampling rate.
Medium / good
< 200ms
50 bits/sec to
IN
11
1.2M bits/s
Medium / better
< 200ms
10s of byte
IN
Data from measured parameter
range
collected off-line and replayed or
sent real-time.
Medium / best
< 200ms
10s of byte
IN, OUT
Events, notifications, request,
range
control and status of physiological
and equipment functionality.
High / best
< 2s
10s of byte
IN, OUT
Physiological and equipment
range
alarms.
Very high / best
< 20s
10s of byte
IN, OUT
Transfer reports, histories or off-line
range to
collection of data.
gigabytes of
data
Table 11-1 QoS Levels Description
11-1-2 OPERATIONAL MODEL
The requirements for data transfer QoS in personal healthcare devices can be accomplished
by PHDC using bulk endpoints and, optionally, an interrupt endpoint. Table 11-2 and
Figure 11-1 show the mapping between QoS and endpoint types.
Endpoint
Bulk OUT
Bulk IN
Interrupt IN
Usage
All QoS host to device data transfers.
Very high, high and medium latency device to host data transfers.
Low latency device to host data transfers.
Table 11-2 Endpoint - QoS Mapping
185
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