Wireless sensor networks
First Claim
Patent Images
1. A wireless sensor network comprising:
- at least one sensor unit comprising a sensor for sensing an environmental parameter and at least one interrogating node, wherein the interrogating node is arranged to transmit an interrogation message periodically to said sensor unit and to receive a reply message from said sensor unit in response to said interrogation message, wherein the sensor unit is arranged to determine whether an alarm condition has been met and, conditional on the sensor unit determining that the alarm condition has not been met, to transmit said reply message after a predetermined deliberate delay and before a subsequent interrogation message is received by the sensor unit; and
otherwise, if the sensor unit determines that the alarm condition has been met, to transmit said reply message before the deliberate delay ends.
2 Assignments
0 Petitions
Accused Products
Abstract
A wireless sensor network comprises at least one sensor unit which comprises a sensor for sensing a parameter and at least one interrogating node. The interrogating node is arranged to transmit an interrogation message periodically to said sensor unit and to receive a reply message from said sensor unit. The sensor unit is arranged to transmit said reply message after a predetermined deliberate delay unless the sensor unit determines that an alarm condition has been met, in which case the sensor unit is arranged to transmit said reply message before the end of the deliberate delay.
-
Citations
25 Claims
-
1. A wireless sensor network comprising:
at least one sensor unit comprising a sensor for sensing an environmental parameter and at least one interrogating node, wherein the interrogating node is arranged to transmit an interrogation message periodically to said sensor unit and to receive a reply message from said sensor unit in response to said interrogation message, wherein the sensor unit is arranged to determine whether an alarm condition has been met and, conditional on the sensor unit determining that the alarm condition has not been met, to transmit said reply message after a predetermined deliberate delay and before a subsequent interrogation message is received by the sensor unit; and
otherwise, if the sensor unit determines that the alarm condition has been met, to transmit said reply message before the deliberate delay ends.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
16. A sensor unit for a wireless sensor network, wherein the sensor unit comprises:
a sensor for sensing an environmental parameter, and the sensor unit is arranged to receive an interrogation message periodically from an interrogating node and to transmit a reply to said interrogating node in response to said interrogation message, wherein said sensor unit is further arranged to determine whether an alarm condition has been met and, conditional on the sensor unit determining that the alarm condition has not been met, to transmit said reply message after a predetermined deliberate delay and before a subsequent interrogation message is received by the sensor unit; and
otherwise, if the sensor unit determines that the alarm condition has been met, to transmit said reply before the deliberate delay ends.- View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
Specification