Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
1999-02-23
2001-06-12
Patel, Ajit (Department: 2662)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C340S870020, C379S106030
Reexamination Certificate
active
06246677
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to automatic meter reading data communication systems. More specifically, the invention relates to an integrated device that attaches to utility meters and communicates commodity usage data and other information over a two-way wireless local area network (LAN) to a remotely located communication device that transmits the data over a two-way fixed common carrier wide area network (WAN) to a utility service provider.
Commodity usage is conventionally determined by utility companies using meters that monitor subscriber consumption. The utility service provider typically determines the subscriber's consumption by sending a service person to each meter location to manually record the information displayed on the meter dial. The manual reading is then entered into a computer which processes the information and outputs a billing statement for the subscriber. Often times it is very difficult for the service person to access a meter. When access to a meter is not possible, billings are made on the basis of estimated readings. These estimated billings often lead to customer complaints.
Visual on-site meter reading by utility service personnel is highly labor intensive, inefficient and very expensive. Therefore, there has been a strong interest on the part of utility companies to take advantage of modern technology to reduce operating costs and increase efficiency by eliminating the necessity for visual on-site meter readings.
Many attempts have been made in recent years to develop an automatic meter reading system for water, gas and electric meters which avoid the high costs of visual on-site meter reading. However, most of these prior art systems have achieved little success.
Various types of devices have been attached to utility meters in an effort to simplify meter reading. These devices were developed to transfer commodity usage data over a communication link to a centrally located service center or utility. These communication links included telephone lines, power lines, or a radio frequency (RF) link.
The use of existing telephone lines and power lines to communicate commodity usage data to a utility have encountered significant technical difficulties. In a telephone line system, the meter data may interfere with the subscriber's normal phone line operation, and would require cooperation between the telephone company and the utility company for shared use of the telephone lines. A telephone line communication link would also require a hard wire connection between the meter and the main telephone line, increasing installation costs. The use of a power line carrier (PLC) communication link over existing power lines would again require a hard wire connection between the meter and the main power line. Another disadvantage of the PLC system is the possibility of losing data from interference on the power line.
Meters have been developed which can be read remotely. Such meters are configured as transponders and include a radio transmitter for transmitting data to the utility. These prior art systems required the meter to be polled on a regular basis by a data interrogator. The data interrogator may be mounted to a mobile unit traveling around the neighborhood, incorporated within a portable hand-held unit carried by a service person, or mounted at a centrally located site. When the meter is interrogated by an RF signal from the data interrogator, the meter responds by transmitting a signal encoded with the meter reading and any other information requested. The meter does not initiate the communication.
However, such prior art systems have disadvantages. The first disadvantage is that the device mounted to the meter generally has a small transceiver having a very low power output and thus a very short range. This would require that the interrogation unit be in close proximity to the meters. Another disadvantage is that the device attached to the meter must be polled on a regular basis by the data interrogator. The device attached to the meter is not able to initiate a communication. The mobile and hand-held data interrogators are of limited value since it is still necessary for utility service personnel to travel around neighborhoods and businesses to remotely read the meters. It only avoids the necessity of entering a residence or other building to read the meters. The systems utilizing a data interrogator at fixed locations still have the disadvantages of low power output from the devices attached to the meters, and requiring polling by the data interrogator to initiate communication.
Therefore, although automatic meter reading systems are known in the prior art, the currently available automatic meter reading systems suffer from several disadvantages, such as low operating range and communication reliability. Thus, it would be particularly desirable to provide an automatic meter reading system that provides reliable communication of information from the meter to the utility, thus avoiding the necessity for utility service personnel to manually read the meters.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a reliable automatic meter reading data communication system extending from a commodity meter to the utility service provider.
Another object of the present invention is to provide an interface management unit that attaches to existing commodity meter register heads and provides commodity utilization data to a remotely located gateway node over a two-way wireless spread spectrum local area network.
A further object of the invention is to provide a gateway node for receiving commodity utilization data from the interface management unit and transmitting that data to a utility service provider over a commercially available fixed common carrier wide area network.
Yet another object of the invention is to provide the communication links necessary for performing data requests from the utility, preprogrammed scheduled meter readings and handling spontaneous tamper and alarm messages from an interface management unit attached to a commodity meter.
The present invention is an automatic meter reading data communication system which incorporates an interface management unit that is attachable to commodity meters such as water, gas and electric meters for collecting, processing and transmitting data from the meter to a remotely located gateway node which transmits the data to the utility service provider. The interface management unit replaces the register head of the commodity meter using an adapter ring to retrofit the interface management unit onto the existing meter body for meters produced by a wide variety of manufacturers. The interface management unit comprises a digital encoder and two-way wireless transceiver for automatically reading commodity usage based on requests from the utility or preprogrammed scheduled readings. The interface management unit also monitors the status of the meters to determine tamper and alarm conditions.
The encoder and transceiver of the interface management unit are made up of four major components. These components include a supervisory microcontroller, a communication microcontroller, a spread spectrum processor and an RF transceiver. The supervisory microcontroller monitors and obtains commodity utilization data from the meter. The supervisory microcontroller also senses for the presence of an interrogation signal from the gateway node. The communication microcontroller is connected to the supervisory microcontroller and controls the internal and external communication functions of the interface management unit. The spread spectrum processor is coupled to the communication microcontroller for enabling the interface management unit to transmit and receive data utilizing an RF spread spectrum communication technique over the local area network. The RF transceiver is coupled to the spread spectrum processor and the communication microcontroller for transmitting commodity utilization data from the meter and for receiving interrogation signals from the gateway node
Dresselhuys Donn R.
Ehrke Lance A.
Nap Kimbel A.
Andrus Sceales Starke & Sawall LLP
Innovatec Communications, LLC
Patel Ajit
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