Apparatus for and method of using an intelligent network and RFID signal router
Apparatuses, systems for, and methods of transporting digital signals and radio-frequency (“RF”) signals are disclosed. In accordance with a preferred embodiment of the invention, an intelligent network (e.g., a combination router) and corresponding method are provided for transporting RF signals to, for example, an RFID antenna and transporting digital signals to, for example, a controller. In a preferred embodiment, the intelligent network is implemented with a manager unit for controlling a plurality of network devices to facilitate the efficient management of RFID-enabled devices. The network devices may include a combination router/switch, which has the capability of switching both digital data and RF data, RFID readers, RFID reader/writer pads, and other devices. In accordance with preferred embodiments, the intelligent network allows enhanced flexibility in controlling systems for interrogation of RFID antennae.
This application claims priority from U.S. Provisional Patent Application Nos. 60/657,709, filed Mar. 3, 2005; and 60/673,757, filed Apr. 22, 2005, which are hereby incorporated by reference in their entireties.
This application also expressly incorporates the following U.S. patent applications by reference in their entirety: U.S. patent application Ser. Nos. 10/338,892, filed Jan. 9, 2003; Ser. No. 10/348,941, filed Nov. 20, 2003; and U.S. Provisional Patent Application Nos. 60/346,388, filed Jan. 9, 2002; 60/350,023, filed Jan. 23, 2002; 60/469,024, filed May 9, 2003; 60/479,846, filed Jun. 20, 2003; and 60/571,877 filed May 18, 2004.
BACKGROUNDRadio frequency identification (RFID) systems typically use one or more reader antennae to send radio frequency (RF) signals to items comprising RFID tags. The use of such RFID tags to identify an item or person is well known in the art. In response to the RF signals from a reader antenna, the RFID tags, when excited, produce a disturbance in the magnetic field (or electric field) that is detected by the reader antenna. Typically, such tags are passive tags that are excited or resonate in response to the RF signal from a reader antenna when the tags are within the detection range of the reader antenna.
The detection range of the RFID systems is typically limited by signal strength over short ranges, for example, frequently less than about one foot for 13.56 MHz systems. Therefore, portable reader units may be moved past a group of tagged items in order to detect all the tagged items, particularly where the tagged items are stored in a space significantly greater than the detection range of a stationary or fixed single reader antenna. Alternately, a large reader antenna with sufficient power and range to detect a larger number of tagged items may be used. However, such an antenna may be unwieldy and may increase the range of the radiated power beyond allowable limits. Furthermore, these reader antennae are often located in stores or other locations where space is at a premium and it is expensive and inconvenient to use such large reader antennae. Alternatively, multiple small antennae may be used. However, such a configuration may be awkward to set up when space is at a premium and wiring is preferred or required to be hidden.
Current RFID reader antennae are designed to maintain a maximum read range between the antenna and associated tags, without violating FCC regulations regarding radiated emissions. When tagged items are stacked, the read range of an antenna can be impeded due to “masking” of the stacked, tagged items. As a result, the masking limits the number of tags that an antenna may read at a given time, and consequently affects the number of products that may be read.
Resonant reader antenna systems are currently utilized in RFID applications, where numerous reader antennae are connected to a single reader. Each reader antenna may have its own tuning circuit that is used to match to the systems characteristic impedance. However, multiple reader antennae (or components thereof) cannot be individually controlled when they are connected by a single transmission cable to a reader unit.
SUMMARYApparatuses, systems for, and methods of transporting digital signals and radio-frequency (“RF”) signals are disclosed. In accordance with a preferred embodiment of the invention, an intelligent network, a device, and corresponding methods and systems are provided for transporting RF signals to, for example, an RFID antenna and transporting digital signals to, for example, a controller. In a preferred embodiment, the intelligent network is implemented with a manager unit for controlling a plurality of network devices to facilitate the efficient management of RFID-enabled devices. The devices may include a combination router/switch, which has the capability of switching both digital data and RF data, RFID readers, RFID reader/writer pads, and other devices (e.g., antennae). In accordance with preferred embodiments, the intelligent network allows enhanced flexibility in controlling systems for interrogation of RFID antennae.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments and applications of the invention will now be described. Other embodiments may be realized and changes may be made to the disclosed embodiments without departing from the spirit or scope of the invention. Although the preferred embodiments disclosed herein have been particularly described as applied to the field of RFID networks, devices, methods, and systems, and other signaling networks, devices, methods, and systems (e.g., DC pulse communications, and voltage-level based communications (Transistor-Transistor Logic (TTL), etc.)), it should be readily apparent that the invention may be embodied in any technology having the same or similar problems.
In accordance with an exemplary embodiment of the invention, a multiple RFID antenna system is illustrated in
The RFID feed system shown in
The RF signal in cable 45 may be routed by gondola controller 30 so that it is sent to shelves on gondola 70, or bypasses gondola 70 and continues on to additional gondolas such as gondola 71. In one preferred embodiment, the term “RF signal” refers to radio frequency signals used, for example, to interrogate an RFID reader antenna or group of antennae. However, it is understood that the term “RF signal” also refers to any other signals capable of being used with the exemplary devices, systems, and methods including, but not limited to, DC pulse communications, or voltage-level based communications (TTL, etc.).
In this embodiment, the term “shelf” refers to one shelf or a group of shelves served by a single shelf controller 40a, 40b, 40c, and the term “gondola” refers to a structure including one or more shelves. The terms “shelf” and “gondola,” however, are not meant to be limiting as to the physical attributes of any structure that may be used to implement embodiments of the invention, but used merely for convenience in explaining this embodiment. Any known structure for storing, housing, or otherwise supporting an object may be used in implementing the various embodiments of the invention. For example, an RF switch 31 may either cause the RF signal to bypass the gondola 70, and continue on through connection 80a to gondola 71 (or through connection 80b), or the RF switch 31 may cause the RF signal to feed into gondola 70. It is to be understood that the term “RF switch” refers to any switch capable of transmitting a signal including, but not limited to, RF, DC pulse communications, or voltage-level based communications (TTL, etc.) signals. Furthermore, one or more additional RF switches 32 may route the RF signal to a particular shelf, for example, through connections 61a, 61b, or 61c to shelves 21a, 21b, or 21c upon gondola 70. In a preferred embodiment, a shelf controller (e.g., controller 40a) may switch the RF signal to one or more of the antenna boards 20 and then to antenna 10. It will be appreciated that while
In one embodiment, the use of RF switch 31 may result in an “insertion loss.” That is, some RF power may be lost as the signal passes through the switch. Thus, the level of RF power reaching gondola 71 and successive additional gondolas may be less than the RF power reaching gondola 70. It is to be understood that the term “RF power” refers to any power source capable of being used with the devices, systems, and methods described herein including, but not limited to, RF, DC pulse communications, or voltage-level based communication (TTL, etc.) power. In one embodiment, however, the RF power may be approximately equal at each antenna 10. For example, it may be desired to set the RF power level at a given antenna 10 high enough to read all RFID tags attached to items resting on the given antenna 10, but not so high as to read RFID tags attached to items resting on adjacent antennae. RF attenuators can be used in accordance with preferred embodiments of the invention to adjust and/or equalize the power level at each antenna 10. For example, RF attenuators (not shown) could be placed between a shelf controller (e.g., controller 40a) and each antenna 10 and used to regulate the RF power at each gondola. It is to be understood that the term “RF attenuator” refers to any attenuator capable of adjusting and/or equalizing the power level at each antenna including, but not limited to, RF, DC pulse communications, or voltage-level based communication (TTL, etc.) power. The RF attenuators may be chosen, for example, to attenuate the RF power more at gondola 70 and less at gondola 71 and successive additional gondolas. In one embodiment, RF attenuators may be placed at other locations within the circuitry (e.g., in connections 61a, 61b, 61c, or between switches 31 and 32) to achieve the same result, as will be apparent to those skilled in the art. In another embodiment, a variable attenuator can be placed between the reader 50 and the switch 30 such that the power can be digitally controlled for each antenna 10. In another embodiment, the reader 50 may be capable of variable RF power output. Placing an RF power detection circuit on the shelf controllers (e.g., RF power detection circuit 41 located on controller 40a) permits control of the RF power delivered to antenna 10.
In accordance with a preferred embodiment of the invention, a plurality of antennae 10 optionally having associated antenna boards 20, shelf controllers 40a, 40b, 40c, gondola controllers 30, and associated wiring, may all be contained in or on a physical structure, as shown, for example, in
In one preferred embodiment, primary controller 100 may selectively operate any of the switches by sending commands (e.g., via digital signals) containing a unique address associated with antenna 10 through, for example, a digital data communication cable 105. The addresses could be transmitted through the use of addressable switches (e.g., switches identical or functionally equivalent to a Dallas Semiconductor DS2405 “1-Wire®” addressable switch). Each such addressable switch, for example, provides a single output that may be used for switching a single antenna. Preferably, the primary controller 100 may selectively operate any or all the switches by utilizing one or more gondola controllers 30 and/or shelf controllers 40a, 40b, 40c. For example, these controllers may be a processing device, which can provide multiple outputs for switching more than one antenna (e.g., all the antennae 10 in proximity to the shelf controller 40a, 40b, 40c). The primary controller 100 may also be any processing device. Communications between the primary controller 100 and the gondola controller 30, for example, can be implemented by using communication signals in accordance with well known communication protocols (e.g., CAN bus, RS-232, RS-485 serial protocols, Ethernet protocols, Token Ring networking protocols, etc.). Likewise communications between the gondola controller 30 and shelf controller 40a, 40b, 40c may be implemented by the same or different communication protocols.
The term “intelligent station” generally refers to equipment, such as a shelf, which may include controllers, switches and/or tuning circuitry, and/or antennae. More than one intelligent station may be connected together and connected to or incorporated with an RFID reader. A primary controller can be used to run the RFID reader and the intelligent stations. The primary controller itself may be controlled by application software residing on a computer. In one embodiment, an “intelligent station” is an “intelligent shelf.”
In a preferred embodiment, the intelligent shelf system is controlled through an electronic network 120, as shown in
Likewise, the shelf controllers 40a, 40b, 40c, and the gondola controllers 30 can transport data signals to the primary controller 100, as can the reader unit 50. In one preferred embodiment, primary controller 100 transports result data back to the controlling system through the electronic network 120. The inventory control processing unit 130, shown in
Primary controller 100 of
In a preferred embodiment, the primary controller 100 can be placed between the electronic network 120 and the reader as shown, for example, in
In
The item information data collected by the reader units 50 from each of the intelligent shelves may be transmitted to an inventory control processing unit 130. The inventory control processing unit 130 is typically configured to receive item information from the intelligent shelves. The inventory control processing unit 130 is typically connected to the intelligent shelves over an electronic network 120 and is also associated with an appropriate data store 140 that stores inventory related data including reference tables and also program code and configuration information relevant to inventory control or warehousing. The inventory control processing unit 130 is also programmed and configured to perform inventory control functions that are well known to those skilled in the art. For example, some of the functions performed by an inventory control (or warehousing) unit include: storing and tracking quantities of inventoried items on hand, daily movements or sales of various items, tracking positions or locations of various items, etc.
In operation, the inventory control system would determine item information from the intelligent shelves that are connected to the inventory control processing unit 130 through an electronic network 120. In one preferred embodiment, one or more intelligent shelves are controlled by inventory control processing unit 130. Inventory control processing unit 130 can determine when the reader units 50 are under control of primary controller 100 and poll the antennae 10 to obtain item inventory information. In an alternate embodiment, the controller(s) 100 may be programmed to periodically poll the connected multiple antennae for item information and then transmit the determined item information to the inventory control processing unit 130 using a reverse “push” model of data transmission. In a further embodiment, the polling and data transmission of item information by the primary controller 100 may be event driven, for example, triggered by a periodic replenishment of inventoried items on the intelligent shelves. In each case, the primary controller 100 would selectively energize the multiple antennae connected to reader 50 to determine item information from the RFID tags associated with the items to be inventoried.
Once the item information is received from the reader units 50 of the intelligent shelves, the inventory control processing unit 130 processes the received item information using, for example, programmed logic, code, and data at the inventory control processing unit 130 and at the associated data store 140. The processed item information is then typically stored at the data store 140 for future use in the inventory control system and method of the invention.
The architecture of the Internet is an example of technology where digital data traveling between two computers is typically routed along a path that may pass through several intervening computers (also known as routers). Furthermore the path may change from time to time, or even during a single transmission. Routing methods have been developed to control the data path so that orderly and simultaneous transmissions may occur between multiple computers. Some of the routing methods that may be used include distance-vector types such as RIP (Routing Information Protocol) and (Cisco's) IGRP (Interior Gateway Routing Protocol), and link-state methods such as OSPF (Open Shortest Path First) and (Cisco's) EIGRP (Enhanced Interior Gateway Routing protocol). These routing methods are well known and are used as examples only, but the concept of a router is not limited by the routing method used to choose the data path.
While the concept of a digital data router is known, one preferred embodiment of the invention is directed to a combination router that routes both RF and digital signals. The router, in one embodiment, can transport an RF signal from an RFID reader 50, 51 along one or more paths to a particular antenna or group of antennae. Such an RF router may be used, for example, to provide redundancy or backup capability for the RF signal paths. In another preferred embodiment, the router is capable of transporting command or control signals (e.g., digital data) between a primary controller 100, 101 and an antenna or antennae 10. In yet another embodiment, a switching system is provided for selecting communication routes (e.g., predetermined data pathways and through predetermined nodes or routers) for RF signals (e.g., between an RFID reader and antenna(e)) and for data signals. In this embodiment, the RF signals and data signals can be transported along an RF pathway following substantially the same communication route as the pathway for digital signals. In one preferred embodiment, the communication routes for RF signals and for digital signals are different. In order to determine which pathways are available for RF signals, in one embodiment the combination router may communicate RF or non-RF “neighbor query” signals over the available RF pathways. By using neighbor query signals, each combination router may determine which other combination routers or other devices are connected to the combination router, and the system may then determine all available RF pathways.
Data router 610 may be a “router” such as is used on the Internet or on other digital networks, or it may be any device which accomplishes the task of routing digital data. It is well known that digital data may be divided into “packets” for transmission over networks. In passing through a data router 610, the data may temporarily be placed in local memory while data switching is being done. “Switching” may occur such that data received through an “input” is then routed to one or more “outputs,” or back out a second “input.” However, for explanation purposes here it will be assumed that data is received in one input and are routed to one output.
In one preferred embodiment, RF router 650 is configured so that one input is routed to one and only one output, although a plurality of switching devices may be provided to switch individual signals.
Similarly, additional primary controller 101 may be connected via connection 106 to a data input on the data (“D”) router of combination router 600, and may also be connected to a data input on the data (“D”) router of another combination router 601. Also for example, RFID reader 51 may be connected via connection 46 to an RF input on the RF (“R”) router of combination router 600, and may also be connected to an RF input on the RF (“R”) router of another combination router 601 via connection 46. The data inputs 105 and 106 are understood to be connected to different inputs on the combination routers, as are the RF inputs 45 and 46.
Additional combination routers may be provided, such as combination router 602. Further, the combination routers may be connected to other combination routers (such as the output of combination router 600 being connected to the input of combination router 602). Further the combination routers may be connected to other devices such as antenna systems 651, 652, 653, 654, and 655. Furthermore, as taught herein, other devices connected to the combination router may connect to additional devices.
In another example (not illustrated), combination router 600 may be configured with switch paths “c” connected, and switch paths “a” disconnected and combination router 601 is configured with switch paths “d” connected and with switch paths “b” disconnected. Further, for example, combination router 602 may be configured with switch paths “e” and “f” connected and with switch paths “g” disconnected. In this case, the data signals from primary controller 100 and the RF signals from RFID reader 50 are routed through switch paths “c” and “f” to antenna system 654, while the data signals from primary controller 101 and the RF signals from RFID reader 51 are routed through switch paths “d” and “e” to antenna system 653.
Not all available (or possible number of) switch pathways are illustrated in
In an illustrated operation of the exemplary embodiment represented by the system of
If no data path can be determined, an alternate pathway can be determined. For example, as an alternative the RF operational readiness parameters may be considered as factors in the initial pathway selection algorithm or other methodology utilized by the primary controller 100, 101.
It should be noted that additional devices may be attached to the exemplary system shown in
In a preferred embodiment, one or more system components (e.g., combination router 600, 601, 602) may include circuitry to determine the operation (e.g., the RF power, active status, fault status, etc.) at one or more devices (e.g., readers) at various locations in the system. The RF power of such devices (e.g., of a reader), for example, in accordance with a preferred embodiment of the invention, can be adjusted or attenuated so that a desired power level is obtained at the component (e.g., combination router 600, 601, 602, a particular one or more antennae 10, etc.). In a preferred embodiment, the system component (e.g., combination router 600, 601, 602) may also comprise circuitry to measure the Voltage Standing Wave Ratio (VSWR) when a particular antenna is selected, in order to gain information about the antenna or the RF connection between the router and the antenna. Ideally, the VSWR is 1.0, but it can be greater than 1.0 if the antenna is disconnected or is not optimally tuned. In accordance with a preferred embodiment, the system may use the VSWR information measured by the component to provide alerts about suboptimal operation, or to cause the antenna tuning to be adjusted, for example, through variable tuning components such as varactors (voltage controlled capacitors).
In addition to the integrity checks, the combination routers 600, 601, 602 may also check the integrity of the RF router 650 in accordance with an embodiment of the invention. Such an integrity check may, for example, determine whether the RF switches (e.g., RF switches 6510, 6520, 6530) are functioning properly through a test or from recent logged data. These checks may also include determining the type of device that is connected to the output ports (e.g., antenna 10, router 602, RF switches 6510, 6520, etc.). The diagnostics can also determine if the antennae 10 connected to the device are within operational parameters.
In step 905, the combination router 600 may communicate its status to other components of the system (e.g., combination routers 601, 602, electronic network 120, etc.). The combination routers 600, 601, 602 and/or the electronic network 120 may then store the status information for use in determining available routes for data and RF signals.
In step 910, the next antenna 10 to be read is determined from, for example, a table, an ordered list, a priority queue, a schedule, a user input, other factors, or a combination of some or all factors.
In step 915, the available routes by which a reader 50 and/or primary controller 100 may communicate with the desired antenna system 653 are determined by a variety of factors (e.g., the stored status information, recent history such as the outcome of earlier attempts to communicate with the desired antenna 10, etc.).
In step 920, if applicable, a data route may be selected from the available data routes. (If not applicable, flow advances to step 940.) Such selection may be based on criteria such as a routing method, for example, RIP or OSPF, or on other criteria suitable for determining a data route.
In step 925, a data connection may be established between a primary controller 100 and the desired antenna 10. For example, the data connection may be established by causing the appropriate data switches (not shown) to be set in one or more combination routers 600, 601, 602.
In step 930, that the data connection has been established may be verified between the primary controller 100 and the desired antenna 10. This verification could, for example, be by a “handshake” communication between the primary controller 100 and the antenna system 653.
In step 935, the acceptability of the data connection may be decided. If the data connect is not acceptable, the flow returns to step 920 to select an alternate data route. If the data connection is acceptable, the flow next moves to step 940.
In step 940, an available RF route may be selected. Preferably, this route will be through the same combination routers 600, 601, 602 as the data connection. Thus the data routing method (augmented by RF integrity checks in step 900) may be used to select the RF route as well.
In step 945, the appropriate RF switches 6510, 6520, 6530 may be set in one or more combination routers 600, 601, 602 in order to provide an RF connection between the RFID reader 50 and the antenna system 653.
In step 950, that the RF connection has been established may be verified between the RFID reader 50 and the desired antenna 10. This verification could, for example, be by a confirmation from the combination router(s) 600, 601, 602 that the appropriate RF switch(es) 6510, 6520, 6530 had been set, or could be, as another example, through a VSWR check to ensure the RF connection is operating within allowable limits.
In step 955, the acceptability of the RF connection is decided. If the RF connection is not acceptable, the flow returns to step 940 to select an alternate RF route. Alternately, the flow may return to step 920 and select a different data route. If the RF connection is acceptable, the flow moves to step 960.
In step 960, the RFID reader 50 is turned on, if it has been off or on standby during the previous operations. Having the RFID reader 50 off or on standby may save power, reduce extraneous RF transmissions, and prevent damage to RF switches 6510, 6520, 6530 during state changes.
In step 965, the RFID tags (e.g. RFID tag 9) are read (e.g., by the connected antenna system 653).
In step 970, any data obtained from the RFID tags 9 may be stored.
In step 975, the RFID reader 50 may be turned off (or placed on standby).
In step 980, the time for status updates is determined. If it is time for a status update, the flow may return to step 900 and continue from there. Alternately, the combination routers 600, 601, 602 independently may continuously or periodically check status per steps 900-905. If a status check is not needed, or after a status check is performed, the flow continues in step 910 by determining which antenna 10 to read next.
In accordance with a preferred embodiment of the invention, an intelligent network may be implemented to facilitate transportation of signals. In an RFID-based system, for example, where RFID signals are to be transported, such an intelligent network may be used to manage the transportation of RFID signals to and from RFID-enabled devices. Preferably, the intelligent network employs one or more manager units used to manage the network. The manager units may incorporate one or more microprocessors or other processing devices used to execute the operations described herein. In particular, the manager units control the network processing of signals over the network and coordinate the inclusion/exclusion of devices on the network.
In accordance with a preferred embodiment, the intelligent network further includes one or more network devices that use the signals transported over the network or facilitate transportation of such signals. The network devices may include one or more combination routers and/or combination switches, as described above, that have the capability of processing and facilitating the transporting of both RF data and digital data signals. Like the manager unit, the network devices may incorporate one or more microprocessors or other processing devices to execute the operations described herein. The network devices may further include RFID readers used to read RFID-enabled devices, as well as RFID reader/writer pads used to read and write RFID-enabled devices.
In accordance with a preferred embodiment, the intelligent network operates to automatically and dynamically reconfigure its network topology as network devices are included or excluded during operation. Preferably, when any network device attempts to be added to the intelligent network, its presence in the network is detected by the manager unit. In a preferred embodiment, for example, a new network device when activated on the intelligent network may issue a notification to the manager unit (directly or through other network devices). The manager unit upon receiving the notification reconfigures its map of the network topology.
In accordance with a preferred embodiment, a new network device may also be detected by its neighboring network devices. Neighboring network devices may detect the notification sent by the new network device and alert the manager unit of the location of the new network device. In accordance with a preferred embodiment of the invention, neighboring network devices detect each other preferably by detecting and exchanging information over the same line for which RF signals will travel. This alert causes the manager unit to be alerted of the new network device, the RF topology and other aspects of the network, and allows the manager unit to reconfigure its map of the network topology.
By continuously maintaining and reconfiguring a network topology, the manager unit is able to more efficiently set up and control the paths of the RF and digital data signals that are transported through the network from one network device to another.
In accordance with a preferred embodiment of the invention, the system provides information regarding one or more network devices (e.g., reader, antenna, etc.) or their ports to determine their status (e.g., fault), characteristics (e.g., power level), etc. The information may be provided by the network devices themselves, neighboring network devices, or other devices (e.g., sensors) located throughout the network. Based on such information one or more components (e.g., manager unit) may be designated to control the operation of the devices (or the routing of information to such devices) to facilitate ultimate operation of the network.
EXAMPLES The following descriptions of
IntelliNetwork™
The intelligent network in accordance with a preferred embodiment of the invention may be implemented using a network known, in this example, as “IntelliNetwork™,” which is a flexible and scalable network of intelligent devices that provide RF signal routing and switching. The names used herein are for exemplary purposes only. An exemplary use of the IntelliNetwork™ is for building RFID systems. One or more RFID readers may be connected into an RF communication network comprising the intelligent devices connected together by RF communication means (for example coaxial cable). RFID signals may thus be communicated from the RFID reader, through the IntelliNetwork™, to one or more antennae. The intelligent devices (or “IntelliDevices™”) themselves, besides helping convey the RF signal, also are connected together by a digital data network used for controlling and monitoring the IntelliDevices™.
The intelligent devices include IntelliRouters™, IntelliSwitches™, and IntelliPads™. These devices will be described first, followed by the IntelliManager™ software that controls the intelligent devices.
Preferably, the IntelliNetwork™ devices have several capabilities for facilitating their management and use in a network environment. They may use DHCP Client implementation, that is, the Dynamic Host Configuration Protocol, an Internet protocol for automating the configuration of computers that use TCP/IP communications. They may use SNMP (Simple Network Management Protocol), which has become a de facto standard for Internet work management. The intelligent devices may use DHCP tags, a standard method of communicating certain operating instructions with DHCP. They may also support UART (universal asynchronous receiver-transmitter) communication preferably through the RF connections to discover from neighbor devices the MAC (Media Access Control) address, a standardized hardware address that uniquely identifies each node of a network, usually being assigned specifically to the NIC (network device such as a network interface card) of the device.
When an intelligent device is powered up, its operating system boots a network device, acquires a DHCP IP address, and automatically configures its internal subnet by DHCP and Autosubnet services provided by the IntelliManager™. The devices register themselves automatically by sending an SNMP cold boot notification to the IntelliManager™, so the IntelliManager™ may identify and query the device, obtaining from it information about the network topology that may be displayed on-screen for the user to view, and may be used for setting up RF pathways between readers and antennae.
For network operations, the intelligent devices, particularly the IntelliRouter™, may support Subnet Masking and a routing protocol such as RIP (Routing Information Protocol), OSPF (Open Shortest Path First), IGRP (Interior Gateway Routing Protocol), EIGRP (Enhanced Interior Gateway Routing Protocol), or any other routing protocol.
Boot-Up and Autodiscovery of IntelliDevices™
The IntelliManager™ picks up the MAC addresses from the cold boot messages, and creates objects inside the Object Manager to represent the devices. IntelliManager™ stores a list of devices from which it received announcements. The IntelliManager™ list of devices 1025 now contains list objects 1001a, 1002a, 1003a (representing the IntelliRouters™) and list objects 1011a, 1012a, and 1013a (representing the IntelliSwitches™).
IntelliRouter™
The IntelliRouter™ is capable of automatic setup using standard DHCP protocols and uses a specialized algorithm for address allocation. It can route digital data as network data packets. It uses SNMP as its main command and control language. It supports network communications to IntelliSwitches™ as well as additional IntelliRouters™, or other devices. It is capable of receiving data packets from the IntelliManager™ and routing them in TCP/IP or other serial data formats to an RFID reader, for instance if the RFID reader does not itself support network communications. The IntelliRouter™ has a switch that can be activated manually to send a signal to the IntelliManager™, identifying the particular IntelliRouter™ so that it may be highlighted on a configuration table or graphic to help with field setup or troubleshooting. The IntelliRouter™ monitors itself and its RF signals or connections, and forwards status and diagnostic information to the IntelliManager™.
One of the capabilities of an IntelliRouter™ is its support for the creation and destruction of RF paths through the IntelliRouter™, which is usually used within a network of IntelliRouters™ and IntelliSwitches™. For example, IntelliRouter™ 1050 has one RF input port R0 and four RF output ports R1-R4. The terms “input” and “output” are used in convenience in describing the IntelliRouter™. In a preferred embodiment, R0-R4 may all be bidirectional. RF switching circuitry is provided as shown by the exemplary block 1065, which is meant to be symbolic and not limiting as to the switch circuitry design. The switching circuitry 1065 is under control of microcontroller 1050, which typically follows commands from the IntelliManager™.
The IntelliRouter™ supports neighbor-to-neighbor identification over the RF path through ports R0-R4. The IntelliRouter™ exchanges MAC address (or other form of unique identification) information with its neighbors over the RF paths, and then sends this information to the IntelliManager™ which can construct a map of the RF network.
Each of the IntelliRouter™ outputs may be connected to another IntelliRouter™ or IntelliSwitch™, or may be connected directly to an RFID antenna. The IntelliRouter™ may have circuitry 1070 for measuring the tuning characteristics of RF ports to determine whether an output port should be utilized (i.e. it will not be used if nothing is connected, or if tuning characteristics are outside defined parameters).
The circuitry 1070 may also measure RF power being applied to an RF antenna port, enabling diagnostics to be performed automatically by the IntelliDevice™ or by the IntelliManager™ software. This also enables the IntelliManager™ to adjust the RF power to an appropriate level, for example by sending a command to an RFID reader. The IntelliRouter™ may have additional circuitry (not shown) for measuring such variables as temperature, voltage, current, etc., and capability to report such measurements to the IntelliManager™.
The IntelliRouter™ may also deliver DC power (for example, 300 milliamps at +12V (not shown)) through the RF output ports when instructed to do so by the IntelliManager™ software. This current, for example, may be used to drive circuitry connected to the antenna.
For a typical IntelliRouter™ 1050, the digital communication block 1060 may have one (typically) or more WAN (Wide area network, such as Internet) ports, several (typically four) LAN (Local area network) ports (for connecting to other IntelliRouters™ or IntelliSwitches™), one or more RF Input ports R0 (typically two), several (typically four) RF output ports R1-R4, as well as (not shown) RS232, PS/2, parallel, USB, or other 10 ports, and ports for input and output power (with the output power being controlled on demand by the IntelliManager™).
For example, an RFID reader (not shown) may be connected to an IntelliRouter™ input port such as R0, and an antenna (not shown) may be connected to one of its output ports such as R2. However, between the RFID reader and the RF input port R0, or between the RF output port R2 and the antenna, there may be additional IntelliRouters™ and/or IntelliSwitches™. When a given reader is to be connected to a given antenna, the IntelliManager™ route manager passes out instructions to each router and switch on the network via SNMP to create a path for the RF to follow from reader to antenna. As a node on the IntelliNetwork™, each router receives its own individual internal switching commands for its own RF switching circuitry 1065 to correctly set the node on the RF Path. Some of the IntelliRouter™ multiple RF input and output ports R0-R4 may serve either as inputs or outputs.
The router may send out SNMP messages to the IntelliManager™ about the general status of the IntelliRouter™. These messages may, for example, include the following types.
A switch notification when a pushbutton is pressed, to send a message to the IntelliManager™, which may then highlight this device on the GUI network map for use during installations or diagnostics.
A critical voltage notification, sent if the IntelliRouter™ power supply exceeds minimum or maximum limits. The IntelliManager™ is able to set these limits, and to provide a graphical display of any devices out of limits.
An external power supply error notification, sent if the routers' external power supply has a problem (too much current, too little current, etc.). The IntelliRouter™ also supplies power to connected devices such as readers. It may also monitor the power connections to other devices for voltage, current, and other conditions, and can send error notifications to the IntelliManager™ if a malfunction is detected in the power connection or supply.
A temperature alarm, if the maximum allowed temperature has been reached.
An RF output fault notification, when there is an RF signal problem.
An output port disconnected notification, when an output port state is changed from connected to disconnected.
A VSWR limit notification, when an RF port has exceeded the high or low VSWR limit.
A neighbor device output port change notification, when the RF output port neighbor has changed. The IntelliManager™ indicates if the neighbor MAC address is changed or the neighbor device is disconnected.
A neighbor device input port change notification, when the RF input port neighbor has changed. The IntelliManager™ indicates if the neighbor MAC address is changed or the neighbor device is disconnected.
The IntelliRouter™ has the ability to query other RF network devices immediately connected to it. It does this by passing preferably over the RF cable its own MAC address and or the MAC address of the neighbor device.
When a device is connected or removed, it sends an alert to the IntelliManager™ so that the network topology map can be automatically updated.
IntelliSwitch™
IntelliPad™
The IntelliPad™ can be connected to the IntelliNetwork™ (or an IntelliManager™ or other controller) for control, to an RF reader, and to a barcode scanner gun. The user may read and/or write EPC and barcode information to and from RFID tags that are placed on the IntelliPad™ or scanned via the scanner gun.
The IntelliPad™ is designed to handle “hands-on” work, such as passing RFID tags over the pad surface to perform various inventory management functions. The IntelliPad™ is preferably read on demand when a user places an item on it. Therefore, a reader may be dedicated to the IntelliPad™, or shared by a few IntelliPads™, or the IntelliPad™ may incorporate interrupt-driven events to cause a “read-on-demand.” IntelliPad™ transactions include an event notification is raised whenever the user triggers a barcode scanner attached to the IntelliPad™, and a read-on-demand in response to the event notification.
Sensors
The intelligent devices, as described previously, may have sensors (1070, 1120, 1170) for use in determining RF power and allowing control of the RF power remotely, measuring RF transmitted power and/or RF reflected power for determining system connectivity, performance, and tuning measurements, to be used to remotely tune components or to make decisions whether a circuit or an antenna should be used. Centralized RF signal power management is a part of the IntelliNetwork™, allowing antennae at different distances from a reader to still have equal or otherwise optimized power.
The IntelliDevices™ may also have temperature measurement sensors, for example to monitor the proper operation of the IntelliDevice™. Voltage and current measurement sensors may likewise be provided to monitor proper operation of various circuitry. Out-of-limits measurements may be reported to the IntelliManager™.
IntelliManager™ software
The IntelliNetwork™ is controlled by a software component called the IntelliManager™. This software runs on a computer such as a workstation, or on a server, or both. The IntelliManager™ coordinates automatic discovery and notification as new devices are deployed on the network and provides GUI based configuration of RFID devices for ease of deployment. The IntelliManager™ is able to set and update custom arrangements of products on shelves. The IntelliManager™ also provides measuring and reporting of inventory as determined through the RFID capabilities of the IntelliNetwork™.
The IntelliManager™ maps the network hardware to a site layout for easy recognition of devices. IntelliManager™ also handles automatic RF route management and switching, allowing for sharing of a reader over many antennae, and providing fault tolerant reads in case of an RF reader fail-over or other system problems. Upon receiving the fail-over recognition the IntelliManager™ may automatically redirect requests from the failed or down device or system to other available devices or systems. It incorporates “plug and play” functionality to auto-announce and identify new devices on the network. If the RF reader supports power adjustments, the IntelliManager™ may control the reader output power to provide optimal RF power levels to any antenna, regardless of physical distance from the reader.
Also at a relatively high level in the hierarchy, as shown, for example, in
The IntelliServices™ 1230 are web services and other software that provide a user interface, reporting features, and the ability for third party software to access filtered item-level data. IntelliServices™ also maintain a configuration database used for certain functions of internal IntelliManager™ components (such as the Object Manager 1320 and Route Manager 1330).
Data Manager 1300 contains a database of current and historical data read from RFID tags, as well as some configuration information used for reporting.
The Network Device Manager 1310 consists of three functional parts. Configuration manager 1340 creates a Reader/Writer Instance (program object) for each physical reader in the network, so that the reader may then be controlled through the Instance telling the reader when to turn on and when to turn off, while the Instance receives RFID data from the reader and passes it to the Data Manager 1300.
Route Manager 1330 determines RF routes that exist between readers and antennae, and chooses a route from an RF reader to each antenna that it serves. The Route Manager also frees up the switched paths after each use, and synchronizes the activity of multiple readers for the most efficient operation.
The Object Manager 1320 is responsible for the discovery of new network devices 1390, and maintains status and configuration information for all devices, including interconnection information. It provides an exemplary software ‘network diagram’ used by the Route Manager to determine RF routes.
Reader Instance Manager 1350 and Writer Instance Manager 1360 send requests to the Route Manager 1330 requesting an RF path from a reader to a specific antenna, allowing use of a reader for multiple antennae by networking connections from one antenna to another.
The SNMP interface 1370 sends commands to all network devices using the Simple Network Management Protocol, an industry standard method of controlling and monitoring networked devices. Communications with TCI/IP (1380) may be used in some cases, for example, between a Reader Instance and a reader. Network Devices 1390 include RF Readers, as well as IntelliRouters™, IntelliSwitches™, IntelliPads™, and shelf assemblies with antenna configurations tailored to the actual fixtures (shelves, storage racks, bins, etc).
The Route Manager 1330 acts as a traffic controller managing the available routes between readers and antennae. It ‘intelligently’ determines and maps the most efficient method of routing RF from a reader to any desired antenna which can be connected to that reader. After the read process is complete for the antenna, the Route Manager releases the path to make other pathways available for the next antennae to be read. The Route Manager synchronizes multiple readers so that they may read simultaneously in the most efficient manner.
The Object Manager 1320 controls discovery of new devices on the network, and for each device, maintains a record of current status and all necessary device information. When the IntelliNetwork™ powers up, and during its operation, the Object Manager oversees an auto-discovery process. Individual devices methodically communicate with each other to determine their neighboring devices, and then communicate this information to the Object Manager, a process which results in automatic device discovery and network mapping. The system literally knows how devices are connected to each other across the RF network.
Thereafter, the Object Manager 1320 holds a representation of every physical device on the IntelliNetwork™, along with a table or map of the interconnections between devices. The Route Manager 1330 consults this table or map to determine an RF route to connect a reader to an antenna. This diagram is also used to provide graphical representations of the IntelliNetwork™ during system configuration.
As shown by arrow 4, the Configuration Manager 1340 instructs the Reader Instance Manager 1350 to creates a Reader Instance 1355 (a software representation of a reader) for each physical reader in the network, and sends setup information to the reader instance. Thereafter, the Reader Instance controls the reader, telling the reader when to turn on and when to turn off. The turn on/turn off sequence is synchronized with several other factors—first the IntelliRouters™ and IntelliSwitches™ must create an RF path to a desired antenna. Then the reader may be turned on and instructed to read all tags in view. After the IntelliManager™ determines that all tag data has been collected, the reader is turned off, and the RF path through the IntelliRouters™ and IntelliSwitches™ is “destroyed” (the switched paths are opened).
The Reader instance manager 1350 first sends configuration data to each reader instance 1355, (also step 4) indicating which antennae to read and when to read them. Each reader instance then may operate autonomously as denoted by arrow 5. In step 6 the reader instance asks the Route Manager 1330 to provide an RF path from the reader to a specific antenna. Each instance thus may direct its reader's attention toward multiple antennae in sequence (zone sets), while the Route Manager arranges for RF connections to be made to the desired antenna. The Route Manager initially creates a table of routes, then updates this table as needed, for example if RF connections are changed. The Route Manager may cooperate (step 7) with the configuration manager 1340 for this and other operations. When a reader instance requests an RF path, the Route Manager having determined a suitable path then in step 8 tells the Object manager 1320 what path is needed. In step 9 the Object Manager sends instructions through SNMP layer 1370 to network devices 1390, instructing the network devices on how to set up the RF path. In step 10, the Reader Instance 1355, in control of its reader (not shown) via TCP/IP 1380 or other protocol, performs an RFID read operation for all tags within range of the antenna. The reader instance receives back the EPC data, and in step 11 passes it on to the Data Manager. It may also instruct the reader to turn off or go to standby.
In step 1415, the Route Manager determines (or has already determined) an appropriate RF path between the reader being used, and the specified antenna. In step 1420 the network devices are instructed to set up the RF path. These instructions and several which follow are passed through object manager 1320, and SNMP layer 1370, to the Network devices 1390.
SNMP commands are sent to each IntelliDevice™ along the RF path, indicating which ports to connect to create the path. The IntelliRouter™(s) and IntelliSwitch™(es) create the requested path to the antenna. In step 1425, a verification is made that the path has been set correctly. In step 1430, the reader instance is informed that the path is ready, at which time the reader is given a read command. In step 1435, the read occurs, with the RF signal traveling through the created RF pathway. Tag data, received back to the reader, is passed to the Reader Instance and from there to the Data Manager.
In step 1440, the Reader Instance Manager having finished the read, sends a path destruction request to the Route Manager, which in turn sends SNMP disconnect commands to IntelliDevices™ on the path. The IntelliRouters™ and IntelliSwitches™ along the path route the SNMP commands. The path is destroyed, and in step 1450 the read is finished and the IntelliDevices™ are available for another read.
Zone Management
A graphical user interface (GUI) permits user to view the IntelliNetwork™ through a representation of “real world” devices. For example, as shown in
Fault reporting supported in IntelliManager™ captures problems that prevent reading item level tags. For example, IntelliManager™ supports a set of notifications that let it detect problems specifically affecting tag reading. More importantly, because of the mapping of antennae to specific hardware, IntelliManager™ is able to apply business context to the errors that are received. For example, where an EMS is able to report a fault with a specific device, the IntelliManager™ is able to provide a layer of context that shows which particular physical shelf assembly and products currently on the shelf (such as DVDs) are affected by the fault.
During installation, the ports of the IntelliRouters™ and IntelliSwitches™ are mapped to the actual ports and antennae of the shelf assemblies. At installation, the shelf assemblies are mapped to the IntelliRouter™ and IntelliSwitches™ to which they are connected.
When messages from the network devices arrive, the system is able to show the faults on the IntelliManager™ user interface in the form of color-coded network device faults, as well as showing the shelves affected by the faults.
A zone management interface handles the configuration of the antenna network to provide the user with the ability to control the way individual zones operate. The antennae of item level shelf assemblies are by necessity close to each other, to be able to give an accurate location resolution for each item. Because shelf designs and product types are different sizes and shapes depending on the application (DVD shelves are one size, music CDs another), the density of antennae may also change. When the antennae are very close to each other, it is possible, due to the nature of the RF field, for more than one antenna to power and interrogate the same passive tag as the read cycle progresses. For example, if three antennae were powering and reading a single tag, the system would show the same product in three different zones. To correct this inaccuracy IntelliManager™ applies sophisticated filtering algorithms at the reader instance level. The reader instance will often read multiple zones before sending the resulting read data on to the Network Device Manager.
The user is able to increase accuracy by sampling the read data multiple times before confirming that the product reporting at that location is accurate. The IntelliManager™ user interface provides sampling and read threshold controls the user can adjust, allowing control over the sampling process. For example, with Samples per Read set to 5 and Hits per Read set to 4, the reader instance will read the zone 5 times one after the other, capturing the product reported at the zone. Any of the item level products that are reported at least 4 times, are reported as present to the data manager.
Related Zones are described in U.S. Provisional Patent Application No. 60/568,847 which is incorporated by reference in its entirety herein. Related zones describe which antennae are close to each other and may be able to read the tags of a zone nearby. Each assembly configuration will include some obvious internal related zones but may not include less obvious related zones on separate shelf assemblies or shelves. The user is able to select a zone and then mark which zones are considered related by selecting two assemblies and associating them with each other.
Hot zones may also be defined, which are represented by a zone that will be read more often than another zone. In a given reader cycle, each zone is by default read with equal priority. It is possible within the application to specify that a zone is read more than once per cycle.
Inventory Reporting—Replenishment
As the customers in the store take goods from the shelf, the store staff uses the replenishment report to identify which products need to be gathered from the back room. It also informs them where in the front of the store to place these items to bring the shelves to full inventory. Because of the graphical interpretation, it is easy to see what parts of the store are affected.
In accordance with a preferred embodiment, other kinds of electrical power (e.g., direct current (DC)) may be used by the antenna system in addition to (or substitution for) RF power. For example, direct current (DC) may be used by the gondola controller 30, as well as by the shelf controllers 40a, etc. and the antenna boards 20. One or more dedicated wires may provide such electrical power, or it may be incorporated into the digital communication highway or with an RF cable. An RF cable may be configured using two conductors (e.g., coaxial cable), wherein both the center conductor and the sheath conductor are utilized in the system. While the RF cable carries an RF signal, a DC voltage may be superimposed on the RF signal, in the same RF cable, to provide DC power to intelligent stations. Voltage regulators may subsequently be used to control or decrease excessive voltages to within usable limits. The RF and data communications could also be combined into a single cable that would carry the RF and digital data. This combination could be accomplished by converting the digital data into an RF signal that is at a frequency that does not interfere with the RFID reader. The RF signal could then be received by the routers and converted back into the digital data stream. The RF, data, and power lines could also all be combined into a single communication channel.
While preferred embodiments of the invention have been described and illustrated, it should be apparent that many modifications to the embodiments and implementations of the invention can be made without departing from the spirit or scope of the invention. Any combination of the router or switching functionality in between a reader and antenna can be used in accordance with preferred embodiments of the invention. Any number of the same or combination of different antenna systems or structures (e.g., loop, serpentine, slot, etc., or variations of such structures) may be implemented on an individual shelf, antenna board, shelf back, divider or other supporting structure.
Although embodiments have been described in connection with the use of a particular exemplary shelf structure, it should be readily apparent that any shelf structure, rack, etc. (or any structure) may be used in selling, marketing, promoting, displaying, presenting, providing, retaining, securing, storing, or otherwise supporting an item or product or used in implementing embodiments of the invention.
Although specific circuitry, components, or modules may be disclosed herein in connection with exemplary embodiments of the invention, it should be readily apparent that any other structural or functionally equivalent circuit(s), component(s) or module(s) may be utilized in implementing the various embodiments of the invention.
The modules described herein, particularly those illustrated or inherent in, or apparent from the instant disclosure, as physically separated components, may be omitted, combined or further separated into a variety of different components, sharing different resources as required for the particular implementation of the embodiments disclosed (or apparent from the teachings herein). The modules described herein, may, where appropriate (e.g., reader 50, primary controller 100, inventory control processing unit 130, data store 140, combination routers 600, 601, 602, logical unit 605, data router 610, RF router 650, etc.) be one or more hardware, software, or hybrid components residing in (or distributed among) one or more local and/or remote computer or other processing systems. Although such modules may be shown or described herein as physically separated components (e.g., data store 140, inventory processing unit 130, primary controller 100, reader 50, gondola controller 30, shelf controller 40a, 40b, 40c, etc.), it should be readily apparent that the modules may be omitted, combined or further separated into a variety of different components, sharing different resources (including processing units, memory, clock devices, software routines, etc.) as required for the particular implementation of the embodiments disclosed (or apparent from the teachings herein). Indeed, even a single general purpose computer (or other processor-controlled device such as an Application Specific Integrated Circuit (ASIC)), whether connected directly to antennae 10, antenna boards 20, gondolas 70, or connected through a network 120, executing a program stored on an article of manufacture (e.g., recording medium such as a CD-ROM, DVD-ROM, memory cartridge, etc.) to produce the functionality referred to herein may be utilized to implement the illustrated embodiments.
One skilled in the art would recognize that inventory control processing unit 130 could be implemented on a general purpose computer system connected to an electronic network 120, such as a computer network. The computer network can also be a public network, such as the Internet or Metropolitan Area Network (MAN), or other private network, such as a corporate Local Area Network (LAN) or Wide Area Network (WAN), Bluetooth, or even a virtual private network. A computer system includes a central processing unit (CPU) connected to a system memory. The system memory typically contains an operating system, a BIOS driver, and application programs. In addition, the computer system contains input devices such as a mouse and a keyboard, and output devices such as a printer and a display monitor. The processing devices described herein may be any device used to process information (e.g., microprocessor, discrete logic circuit, application specific integrated circuit (ASIC), programmable logic circuit, digital signal processor (DSP), MicroChip Technology Inc. PICmicro® Microcontroller, Intel Microprocessor, etc.).
The computer system generally includes a communications interface, such as an Ethernet card, to communicate to the electronic network 120. Other computer systems may also be connected to the electronic network 120. One skilled in the art would recognize that the above system describes the typical components of a computer system connected to an electronic network. It should be appreciated that many other similar configurations are within the abilities of one skilled in the art and all of these configurations could be used with the methods and systems of the invention. Furthermore, it should be recognized that the computer and network systems (as well as any of their components) as disclosed herein can be programmed and configured as an inventory control processing unit to perform inventory control related functions that are well known to those skilled in the art.
In addition, one skilled in the art would recognize that the “computer” implemented invention described herein may include components that are not computers per se but also include devices such as Internet appliances and Programmable Logic Controllers (PLCs) that may be used to provide one or more of the functionalities discussed herein. Furthermore, while “electronic” networks are generically used to refer to the communications network connecting the processing sites of the invention, one skilled in the art would recognize that such networks could be implemented using optical or other equivalent technologies. Likewise, it is also to be understood that the invention utilizes known security measures for transmission of electronic data across networks. Therefore, encryption, authentication, verification, and other security measures for transmission of electronic data across both public and private networks are provided, where necessary, using techniques that are well known to those skilled in the art.
Moreover, the operational flow and method shown in, and described with respect to,
It is to be understood therefore that the invention is not limited to the particular embodiments disclosed (or apparent from the disclosure) herein, but only limited by the claims appended hereto.
Claims
1. A method of operating an RFID system comprising:
- a) performing a self-check of operability with at least one combination router;
- b) communicating results of the self-test to at least one additional component;
- c) determining an antenna to be read;
- d) determining an available RFID reader; and
- e) determining at least one available first and second route for a first and a second signal respectively to be sent from an RFID reader to the antenna to be read.
2. The method of claim 1, wherein the step of performing a self-check comprises an integrity check.
3. The method of claim 2, wherein the integrity check comprises determining which input/output ports of the at least one combination router are in communication with the system.
4. The method of claim 3, wherein the integrity check comprises identifying what device is connected to each input/output port of the at least one combination router.
5. The method of claim 2, wherein the integrity check is performed with real-time or logged data.
6. The method of claim 1, further comprising f) selecting a first route for the first signal.
7. The method of claim 6, further comprising g) establishing a first signal connection between the network and the first signal along the selected route.
8. The method of claim 7, further comprising h) verifying the first signal connection between the network and the first signal along the selected route.
9. The method of claim 8, further comprising i) determining if the first signal connection is verified.
10. The method of claim 9, further comprising j) repeating steps f) through i) if the first signal connection is not verified.
11. The method of claim 9, further comprising k) selecting a second route for the second signal if the connection is verified.
12. The method of claim 11, further comprising l) establishing a second signal connection between the network and the second signal along the selected route.
13. The method of claim 12, further comprising m) verifying the second signal connection between the network and the first signal along the selected route.
14. The method of claim 13, further comprising n) determining if the second signal connection is verified.
15. The method of claim 14, further comprising o) repeating steps k) through n) if the second signal connection is not verified.
16. The method of claim 14, further comprising:
- supplying power to the selected RFID reader if the second signal connection is verified; and
- interrogating the antenna to be read.
17. The method of claim 16, further comprising storing the results of the step of interrogating the antenna to be read.
18. The method of claim 16, further comprising decreasing power supplied to the selected RFID reader.
19. The method of claim 18, further comprising determining if a status update is needed.
20. The method of claim 19, further comprising repeating steps a) and b) if it is determined that a status update is needed.
Type: Application
Filed: Mar 3, 2006
Publication Date: Sep 14, 2006
Inventors: Richard Campero (San Clemente, CA), Thomas Cocotis (San Diego, CA), Steve Trivelpiece (Irvine, CA), Tim von Kaenel (Coto De Caza, CA)
Application Number: 11/366,497
International Classification: G06K 7/00 (20060101); G05B 13/02 (20060101); G21C 17/00 (20060101); G08B 13/14 (20060101);
