Tag communication protocol & system
First Claim
1. A method of establishing communication between a radar and an RF tag having a sleep stage and a scan stage, the method comprising the steps of:
- a) alternating the RF tag between the sleep stage and the scan stage;
b) transmitting a wake-up call to the RF tag via the radar;
c) receiving the wake-up call from the radar when the RF tag is in the scan stage;
d) transmitting a downlink message to the RF tag via the radar;
e) sending an uplink message to the radar via the RF tag upon receipt of the downlink message; and
f) returning the RF tag to the sleep stage.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of communicating to a RF tag having a low power mode and a scan mode with a radar and an interrogator. The method comprises the steps of alternating the RF tag between the low power mode and the scan mode and then transmitting a wake-up call to the RF tag with the radar. Next, the wake-up call is received from the radar by the RF tag when the RF tag is in the scan mode. Once the wake-up call has been received, the radar will transmit a downlink message to the RF tag. Upon receipt of the downlink message, the RF tag will send an uplinked message to the radar. After the uplink message has been sent to the radar, the RF tag will return to the low power mode. By alternating the RF tag between the low power mode and the scan mode, the power consumption of the RF tag is greatly reduced thereby increasing the battery life thereof.
-
Citations
21 Claims
-
1. A method of establishing communication between a radar and an RF tag having a sleep stage and a scan stage, the method comprising the steps of:
-
a) alternating the RF tag between the sleep stage and the scan stage;
b) transmitting a wake-up call to the RF tag via the radar;
c) receiving the wake-up call from the radar when the RF tag is in the scan stage;
d) transmitting a downlink message to the RF tag via the radar;
e) sending an uplink message to the radar via the RF tag upon receipt of the downlink message; and
f) returning the RF tag to the sleep stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A radio frequency tag communications system comprising:
-
a radar configured to transmit a wake-up call and a downlink message, and to receive an uplink message; and
a tag having a scan stage and a low power sleep stage, the tag being configured to alternate between the sleep stage and the scan stage and to receive the downlink message and transmit the uplink message after the scan stage. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification