System for communication with a remote meter interface

• US 6,137,423 A
• Filed: 06/03/1999
• Issued: 10/24/2000
• Est. Priority Date: 06/13/1997
• Status: Expired due to Fees

• Current Assignee: Safeguard Delaware, Inc. (Safeguard Scientifics (Delaware), Inc.)
• Original Assignee: Whisper Communications LLC
• Inventors: Naddaf, Ali R., Russ, Jr., Robert M., Bassett, William W., Glorioso, Charles A.
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): WONG, ALBERT KANG
• Application Number:
  US09/325,094
• Time in Patent Office: 509 Days
• Field of Search: 340/870.02, 340/870.03, 340/870.11, 340/637, 340/539, 324/110, 375/206, 455/412, 455/426
• US Class Current: 340/870.02
• CPC Class Codes: G08C 17/02 using a radio link

Abstract

A system for communication between multiple remote meter interfaces (RMI)s and a central office. The system includes multiple RMIs for reading meters and transmitting wireless data signals including meter readout information; multiple base repeater stations for receiving the wireless data signals where each particular base repeater station recognizes the wireless data signal only from particular RMIs that have been identified to the base repeater station, concentrates the information from the identified RMIS, and passes the concentrated information through a master base station and a wide area network (WAN) to a central office. The base repeater station includes a receiver for receiving the wireless data signal, a transmitter for passing concentrated information to the master station, and a microcontroller including an identification (ID) list including the IDs of the RMIs with which the base repeater station is enabled to communicate.

Claims

1. A method for communicating with remote interfaces, comprising steps of:

organizing time in a repeater station for alternating between scheduled time segments allocated to scheduled ones of said remote interfaces for scheduled communications with said scheduled remote interfaces and acquisition time segments for unscheduled communications with unscheduled ones of said remote interfaces, one of said scheduled time segments alternating with one of said acquisition time segments;

allocating a first of said scheduled time segments in said repeater station to a first of said scheduled remote interfaces having a first identification;

initiating a first of said scheduled communications within said first scheduled time segment by transmitting a data signal having sensor data and said first identification from said first scheduled remote interface;

receiving first scheduled time segment signal energy including said data signal at said repeater station during said first scheduled time segment;

transmitting a repeater signal including said sensor data from said repeater station when said first identification is detected in said first scheduled time segment signal energy;

receiving said repeater signal at a master station; and

transmitting said sensor data from said master station for use by a central office.

2. The method of claim 1, further comprising a step of:

transmitting a return signal from said repeater station to said first scheduled remote interface during said first scheduled time segment when said data signal having said first identification is detected in said first scheduled time segment signal energy.

3. The method of claim 1, further comprising steps of:

storing installed identifications in said repeater station, said installed identifications corresponding respectively to certain ones of said remote interfaces;

initiating a first of said unscheduled communications within a first of said acquisition time segments by transmitting an acquisition signal having a second identification from a first of said unscheduled remote interfaces;

receiving first acquisition time segment signal energy including said acquisition signal at said repeater station during said first acquisition time segment; and

transmitting a return acquisition signal from said repeater station to said first unscheduled remote interface during said first acquisition time segment when said acquisition signal is detected and said second identification matches any one of said installed identifications.

4. The method of claim 3, wherein:

said acquisition signal has a frequency hop pattern having an actual carrier frequency in each said unscheduled communication, respectively, said actual carrier frequency intended to be one of a set of expected carrier frequencies as determined by a frequency hop pattern associated with said first unscheduled remote interface; and

the step of receiving said first acquisition time segment signal energy includes dithering in a dither range about a particular one of said expected carrier frequencies of said frequency hop pattern for detecting said acquisition signal when said actual carrier frequency is within said dither range of said expected carrier frequency.

5. The method of claim 3, further including steps of:

providing additional repeater stations with overlapping receiving ranges for said remote interfaces;

storing installed identifications in said repeater stations, all of said installed identifications in each one of said repeater stations different than any one of said installed identifications in each other of said repeater stations; and

in said each one of said repeater stations, ignoring said acquisition signal when said second identification does not match any one of said installed identifications in said one of said repeater stations, whereby communication with each of said remote interfaces is acquired through only one of said repeater stations.

6. The method of claim 1, wherein:

the step of organizing time includes allocating a particular one said scheduled time segments for repeater communication between said repeater station and said master station; and

the step of transmitting said repeater signal includes transmitting said repeater signal during said particular one of said scheduled time segments allocated to said repeater communication.

7. A communication system having remote interfaces, comprising:

a repeater station including a base processor for storing a first identification and organizing time for alternating between scheduled time segments allocated to scheduled ones of said remote interfaces for scheduled communications with said scheduled remote interfaces and acquisition time segments for unscheduled communications with unscheduled ones of said remote interfaces, one of said scheduled time segments alternating with one of said acquisition time segments;

a first of said scheduled remote interfaces for initiating said scheduled communications within a first of said scheduled time segments allocated to said first scheduled remote interface by transmitting a data signal having sensor data and said first identification;

the repeater station further including a base receiver coupled to said base processor for receiving first scheduled time segment signal energy during said first scheduled time segment and a base transmitter coupled to said base processor for transmitting a repeater signal including said sensor data when said data signal having said first identification is detected in said first scheduled time segment signal energy; and

a master station for receiving said repeater signal and transmitting said sensor data for use by a central office.

8. The system of claim 7, wherein:

said base transmitter is further for transmitting a return signal to said first scheduled remote interface during said first scheduled time segment when said data signal having said first identification is detected in said first scheduled time segment signal energy.

9. The system of claim 7, further comprising:

a first of said unscheduled remote interfaces for initiating a first of said unscheduled communications within a first of said acquisition time segments by transmitting an acquisition signal having a second identification;

said base receiver is further for receiving first acquisition time segment signal energy during said first acquisition time segment;

said base processor is further for storing installed identifications corresponding respectively to certain ones of said remote interfaces; and

said base transmitter is further for transmitting a return acquisition signal to said first unscheduled remote interface during said first acquisition time segment when said second identification matches any one of said installed identifications.

10. The system of claim 9, wherein:

said acquisition signal has a frequency hop pattern having an actual carrier frequency in each said unscheduled communication, respectively, said actual carrier frequency intended to be one of a set of expected carrier frequencies as determined by a frequency hop pattern associated with said first unscheduled remote interface; and

said base receiver is further for dithering in a dither range about a particular one of said expected carrier frequencies of said frequency hop pattern for detecting said acquisition signal when said actual carrier frequency is within said dither range of said expected carrier frequency.

11. The system of claim 9, further comprising:

several additional repeater stations with overlapping receiving ranges for said remote interfaces, said additional repeater stations for storing installed identifications, all of said installed identifications in each one of said repeater stations different than any one of said installed identifications in each other of said repeater stations, each one of said repeater stations for ignoring said acquisition signal when said second identification does not match any one of said installed identifications in said one of said repeater stations, whereby communication with each of said remote interfaces is acquired through only one of said repeater stations.

12. The system of claim 7, wherein:

said base processor is further for allocating a particular one of said scheduled time segments for repeater communication between the repeater station the said master station; and

said base transmitter is further for transmitting said repeater signal during said particular one of scheduled time segments allocated to said repeater communication.