Intel® Responsive Retail Sensor (RRS) Hx Series Sensor
User & Installation Guide
August 2018
Page: 30
Revision 0.4
T-R Calculation (us)
200
85.33
71.11
20
33.33
Divide Ratio
8
21.33
21.33
8
21.33
Data Encoding
FM0
Miller-4
Miller-4
FM0
FM0
Pilot Tone
1
1
1
1
1
Link Frequency (kHz)
40
250
300
400
640
Data Rate (kbps)
40
62.5
75
400
640
Session
Tag Energized
Tag Not Energized
S0
Indefinite
None
S1
500 ms < persistence < 5 s
2 s < persistence
S2
Indefinite
2 s < persistence
S3
Indefinite
2 s < persistence
8.3
Managing Large Tag Populations
The RFID Gateway can segregate a large tag population into several smaller ones using
the Retail Sensor Platform’s “select" and “post-match" functions. Segregation allows the
RRS-Sensors to more accurately inventory a tag population by avoiding collisions. This
same functionality can also be used to isolate a single tag that might be located in a
challenging RF environment or perhaps physically oriented in a less than optimal fashion.
A
challenge in managing larger tag populations is dealing with “tag collisions" during the
query-response (more than one tag responding at exactly the same time). The
RRS-
Sensors offers an adaptive algorithm (Dynamic-Q) function to mitigate tag collisions. An
adaptive Q algorithm increases the reading efficiency significantly thereby reducing the
time it takes to completely inventory a large tag population. The
RRS-
Sensors allows the
RFID Gateway to optimally configure the Q Algorithm based on a known tag population.
Dynamic-Q is used by default, which relieves the Gateway from having to explicitly set
the Q-value.