Requested time adjustment for accurate data exchange
View Patent ↗A system, method and device are provided for reducing consumption calculation errors caused due to time drift in an endpoint device. In one embodiment, the endpoint device transmits consumption data in response to a request for consumption data. The request generally includes a time period of the consumption data. The endpoint device adjusts the set of intervals based on the extent of the difference between the collection system time and the endpoint device time to obtain the most accurate intervals. The process for adjusting intervals can be implemented independently from time synchronization between the endpoint and collection systems. Further, the process for adjusting intervals does not result in updating the meter reading data that have been already logged and stored in the endpoint device.
1. A method of providing accurate meter reading data from an endpoint device, the method comprising:
receiving, from a remote device, a current remote device time and a request for meter reading data for a specified number of time intervals;
determining whether a difference between the remote device time and the endpoint device time is less than a threshold;
if the difference is not less than the threshold:
adjusting the number of time intervals used to calculate meter reading;
calculating the meter reading data over the adjusted number of time intervals; and
responding to the request by transmitting the calculated meter reading data over the adjusted number of time intervals to the remote device.
2. The method as recited in claim 1 , wherein adjusting the number of time intervals includes:
if the current remote device time is greater than the endpoint device time, adjusting the number of time intervals used to calculate meter reading to include one more time interval than is reflected in the request; and
if the endpoint device time is greater than the current remote device time, adjusting the number of time intervals used to calculate meter reading to include one less time interval than is reflected in the request.
3. The method as recited in claim 1 , further comprising if the difference is less than the threshold:
calculating the meter reading data over the number of time intervals specified in the request; and
responding to the request by transmitting the calculated meter reading data for the specified number of time intervals to the remote device.
4. The method as recited in claim 1 , wherein the meter reading data is transmitted to the remote device without causing the endpoint device to record a short interval of consumption data.
5. The method as recited in claim 1 , wherein the calculated meter reading data is transmitted to the remote device without adjusting the number of intervals if the current remote device time is not received from the collection system.
6. The method as recited in claim 1 , wherein calculating the meter reading data over the adjusted number of time intervals is performed without adjusting the time that is maintained by the endpoint device.
7. The method as recited in claim 1 , wherein calculating the meter reading data over the adjusted number of time intervals is performed without adjusting the time that is maintained by the remote device.
8. The method as recited in claim 1 , wherein the threshold for adjusting the number of time intervals is 30 minutes.
9. An apparatus for transferring accurate meter reading data from an associated endpoint device to a collection system, the apparatus comprising:
a memory unit for storing meter reading data collected at predetermined time intervals;
a communication unit for receiving, from the collection system, a collection system time and a request for meter reading data for a specified number of time intervals; and
a processing unit operable to:
determine whether a difference between the collection system time and the endpoint device time is less than a threshold; and
if the difference is not less than the threshold:
adjust the number of time intervals used to calculate meter reading;
calculate the meter reading data over the adjusted number of time intervals; and
respond to the request by causing the communication unit to transmit the calculated meter reading data over the adjusted number of time intervals to the collection system.
10. The apparatus of claim 9 , wherein the number of time intervals used to calculate the meter reading data is adjusted to include one less time interval than is reflected in the request if the time of the endpoint device is greater than the time as reported by the collection system.
11. The apparatus of claim 9 , wherein the number of time intervals used to calculate the meter reading data is adjusted to include one more time interval than is reflected in the request if the time as reported by the collection system is greater than the time of the endpoint device.
12. The apparatus of claim 10 , wherein a recorded interval is generated to include the meter reading data collected at a predetermined time interval and the time interval information and the generated record interval are stored in the memory.
13. The apparatus of claim 9 , wherein the minute portion of the current collection system time is extracted to determine the difference between the current collection system time and the endpoint device time.
14. The apparatus of claim 10 , wherein the threshold for adjusting the time intervals is 30 minutes.