Source: http://www.google.com.mx/patents/USRE41531?dq=5321807
Timestamp: 2013-05-18 18:41:12
Document Index: 387180291

Matched Legal Cases: ['Application No. 05016513', 'Application No. 05016514', 'art 3', 'art 3', 'art 1', 'art 2', 'art 3', 'art 4', 'art 1', 'art 2', 'art 3', 'art 3', 'art 3', 'art 3', 'art 1', 'art 2', 'art 3', 'art 4', 'art 1', 'art 2', 'art 3', 'art 3']

Patent USRE41531 - Communications systems for radio frequency identification (RFID) - Google PatentsSearch Images Play YouTube Gmail Drive Calendar Translate More »Advanced Patent Search | Web History | Sign inAdvanced Patent SearchPatentsA method ofsystem for establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method comprising utilizing a tree search method to establish communications without collision between the interrogator and individual ones of the multiple...http://www.google.com.mx/patents/USRE41531?utm_source=gb-gplus-sharePatent USRE41531 - Communications systems for radio frequency identification (RFID)Publication numberUSRE41531 E1Publication typeGrantApplication number11/859,364Publication date17 Aug 2010Filing date21 Sep 2007Priority date19 Feb 1998Also published asUS6118789US6233369US6307847USRE41530USRE42900USRE43254InventorsJr. Clifton W. WoodOriginal AssigneeRound Rock Research, LlcMicron Technology, Inc.U.S. Classification370/329370/347370/346International ClassificationH04L12/44G06T5/20G06T1/60G06F13/40H04W4/00Cooperative ClassificationH04W4/00H04L12/44G06T5/20G06F13/4027G06T1/60European ClassificationH04W4/00G06F13/40D5G06T1/60G06T5/20H04L12/44ReferencesPatent Citations (103)Non-Patent Citations (84)Referenced by (3)External LinksUSPTOUSPTO AssignmentEspacenetCommunications systems for radio frequency identification (RFID)US RE41531 E1Abstract A method ofsystem for establishing wireless communications between an interrogator and individual ones of multiple wireless identification devices, the method comprising utilizing a tree search method to establish communications without collision between the interrogator and individual ones of the multiple wireless identification devices, a search tree being defined for the tree search method, the tree having multiple levels respectively representing subgroups of the multiple wireless identification devices, the method further comprising starting the tree search at a selectable level of the search tree. A communications system comprising an interrogator, and a plurality of wireless identification devices configured to communicate with the interrogator in a wireless fashion, the respective wireless identification devices having a unique identification number, the interrogator being configured to employ a tree search technique to determine the unique identification numbers of the different wireless identification devices so as to be able to establish communications between the interrogator and individual ones of the multiple wireless identification devices without collision by multiple wireless identification devices attempting to respond to the interrogator at the same time, wherein the interrogator is configured to start the tree search at a selectable level of the searched tree.The interrogator transmits a first request comprising a bit string comprising a plurality of bits for use in selecting one or more wireless identification devices to participate in a slotted anticollision algorithm. Wireless identification devices in a field of the interrogator use the bit string to determine whether or not they are selected for participation. Those wireless identification devices that are selected for participation respond to the interrogator in a slot with a certain probability in accordance with the slotted anticollision algorithm. Drawings(4)Claims
establishing for respective devices unique identification numbers respectively having a first predetermined number of bits; establishing a second predetermined number of bits to be used for random values; causing the devices to select random values, wherein respective devices choose random values independently of random values selected by the other devices; determining the maximum number of devices potentially capable of responding to the interrogator; transmitting a command from the interrogator requesting devices having random values within a specified group of random values to respond, by using a subset of the second predetermined number of bits, the specified group being chosen in response to the determined maximum number; receiving the command at multiple devices, devices receiving the command respectively determining if the random value chosen by the device falls within the specified group and, if so, sending a reply to the interrogator; and determining using the interrogator if a collision occurred between devices that sent a reply and, if so, creating a new, smaller, specified group.
causing the devices to select random values for use as arbitration numbers, wherein respective devices choose random values independently of random values selected by the other devices, the devices being addressable by specifying arbitration numbers with any one of multiple possible degrees of precision; transmitting a command from the interrogator requesting devices having random values within a specified group of a plurality of possible groups of random values to respond, the specified group being less than the entire set of random values, the plurality of possible groups being organized in a binary tree defined by a plurality of nodes at respective levels, wherein the size of groups of random values decrease in size by half with each node descended, wherein the specified group is below a node on the tree selected based on the maximum number of devices capable of communicating with the interrogator; receiving the command at multiple devices, devices receiving the command respectively determining if the random value chosen by the device falls within the specified group and, if so, sending a reply to the interrogator; and, if not, not sending a reply; and determining using the interrogator if a collision occurred between devices that sent a reply and, if so, creating a new, smaller, specified group by descending in the tree.
establishing for respective devices a predetermined number of bits to be used for random values, the predetermined number being a multiple of sixteen; causing the devices to select random values, wherein respective devices choose random values independently of random values selected by the other devices; transmitting a command from the interrogator requesting devices having random values within a specified group of a plurality of possible groups of random values to respond, the specified group being equal to or less than the entire set of random values, the plurality of possible groups being organized in a binary tree defined by a plurality of nodes at respective levels, wherein the maximum size of groups of random values decrease in size by half with each node descended, wherein the specified group is below a node on a level of the tree selected based on the maximum number of devices known to be capable of communicating with the interrogator; receiving the command at multiple devices, devices receiving the command respectively determining if the random value chosen by the device falls within the specified group and, only if so, sending a reply to the interrogator, wherein sending a reply to the interrogator comprises transmitting both the random value of the device sending the reply and the unique identification number of the device sending the reply; using the interrogator to determine if a collision occurred between devices that sent a reply and, if so, creating a new, smaller, specified group using a level of the tree different from the level used in the interrogator transmitting, the interrogator transmitting a command requesting devices having random values within the new specified group of random values to respond; and if a reply without collision is received from a device, the interrogator subsequently sending a command individually addressed to that device.
an interrogator; a number of communications devices capable of wireless communications with the interrogator; means for establishing a predetermined number of bits to be used as random numbers, and for causing respective devices to select random numbers respectively having the predetermined number of bits; means for inputting a predetermined number indicative of the maximum number of devices possibly capable of communicating with the receiver; means for causing the interrogator to transmit a command requesting devices having random values within a specified group of random values to respond, the specified group being chosen in response to the inputted predetermined number; means for causing devices receiving the command to determine if their chosen random values fall within the specified group and, if so, send a reply to the interrogator; and means for causing the interrogator to determine if a collision occurred between devices that sent a reply and, if so, create a new, smaller, specified group.
an interrogator configured to communicate to a selected one or more of a number of communications devices; a plurality of communications devices; the devices being configured to select random values, wherein respective devices choose random values independently of random values selected by the other devices, different sized groups of devices being addressable by specifying random values with differing levels of precision; the interrogator being configured to transmit a command requesting devices having random values within a specified group of a plurality of possible groups of random values to respond, the specified group being less than the entire set of random values, the plurality of possible groups being organized in a binary tree defined by a plurality of nodes at respective levels, wherein the size of groups of random values decrease in size by half with each node descended, wherein the specified group is below a node on the tree selected based on a predetermined maximum number of devices capable of communicating with the interrogator; devices receiving the command being configured to respectively determine if their chosen random values fall within the specified group and, if so, send a reply to the interrogator; and, if not, not send a reply; and the interrogator being configured to determine if a collision occurred between devices that sent a reply and, if so, create a new, smaller, specified group by descending in the tree.
an interrogator configured to communicate to a selected one or more of a number of RFID devices; a plurality of RFID devices, respective devices being configured to store unique identification numbers respectively having a first predetermined number of bits, respective devices being further configured to store a second predetermined number of bits to be used for random values, respective devices being configured to select random values independently of random values selected by the other devices; the interrogator being configured to transmit an identify command requesting a response from devices having random values within a specified group of a plurality of possible groups or random values, the specified group being less than or equal to the entire set of random values, the plurality of possible groups being organized in a binary tree defined by a plurality of nodes at respective levels, wherein the maximum size of groups of random values decrease in size by half with each node descended, wherein the specified group is below a node on a level of the tree selected based on the maximum number of devices known to be capable of communicating with the interrogator; devices receiving the command respectively being configured to determine if their chosen random values fall within the specified group and, only if so, send a reply to the interrogator, wherein sending a reply to the interrogator comprises transmitting both the random value of the device sending the reply and the unique identification number of the device sending the reply; the interrogator being configured to determine if a collision occurred between devices that sent a reply and, if so, create a new, smaller, specified group using a level of the tree different from the level used in previously transmitting an identify command, the interrogator transmitting an identify command requesting devices having random values within the new specified group of random values to respond; and the interrogator being configured to send a command individually addressed to a device after communicating with a device without a collision.
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