Locating and tracking user equipment in the RF beam areas of an LTE wireless system employing agile beam forming techniques

A method for locating and tracking cellular mobile transceiver devices within areas covered by RF beams generated by an agile beam forming antenna subsystem, the method comprising:

• generating a number m different sets of fixed position patterns of a number N different RF beams, m and N being fixed positive integers, from an agile beam forming antenna subsystem of a cellular LTE base transceiver station adapted for RF frequency division duplexing (FDD), where the cellular LTE base transceiver station is in communication with a plurality of mobile transceiver devices within a cell coverage area of the cellular LTE base transceiver station, a cell being a sector operating a single carrier, each RF beam covering a sub-area of the cell coverage area where the m sets of N RF beams cover the cell coverage area,
• wherein m=1, 2, 3, or 4, and the agile beam forming antenna subsystem is adapted to generate each of the m sets of N RF beams in a different one-millisecond sub-frame of an LTE frame such that the m sets of N RF beams are generated in a sequence across four contiguous one-millisecond sub-frames and to enable operation of Hybrid-ARQ functionality with a 4 millisecond interval between a data packet transmission from a respective one of the plurality of mobile transceiver devices to the cellular LTE base transceiver station and an ACK or NAK sent from the cellular LTE base transceiver station in response to receipt of the data packet transmission, and with an 8 millisecond interval between the data packet transmission and a retransmission of the same data packet from the respective one of the plurality of mobile transceiver devices if a NAK is received, and further, wherein the cellular LTE base transceiver station is adapted to generate at least one of a CQI (channel quality index) measurement command and an SRS (sounding reference signal) command to the respective one of the plurality of mobile transceiver devices and 4 milliseconds later, the respective one of the plurality of mobile transceiver devices transmits at least one of a CQI measurement report and an SRS signal back to the base transceiver station,
• wherein when a target mobile transceiver device first accesses the cellular LTE base transceiver station via one of a Random Access Procedure, a Handover Procedure, and a Service Request Procedure, the cellular LTE base transceiver station initiates an initial location determination algorithm that determines an initial location of the target mobile transceiver device by sending commands to the target mobile transceiver device commanding it to send at least one of an aperiodic CQI measurement report and an aperiodic SRS signal to the cellular LTE base transceiver station in each of at least m sub-frames, where each of the m sub-frames is one in which a different set of N RF beams is generated by the agile beam forming antenna subsystem, and wherein the responses received by the cellular LTE base transceiver station from the target mobile transceiver device are analyzed to determine at least one of the m times N RF beams generated by the agile beam forming antenna subsystem as being the best RF beam to cover the current location of the target mobile transceiver device for communication transmissions.

A system for locating and tracking cellular mobile transceiver devices within the areas covered by RF beams generated by an agile beam forming antenna subsystem, the system comprising:

• a cellular LTE base transceiver station adapted for RF time division duplexing (TDD) communication with a plurality of mobile transceiver devices within a cell coverage area of the cellular LTE base transceiver station, a cell being a sector operating a single carrier, the cellular LTE base transceiver station comprising an agile beam forming antenna subsystem that generates a number m different sets of fixed-position patterns of a number N RF beams, m and N being fixed positive integers, each RF beam covering a sub-area of the cell coverage area where the m sets of N RF beams cover the cell coverage area, and
• wherein m=1, 2, or 3, depending on the TDD Up/Down configuration, and the agile beam forming antenna subsystem is adapted to generate each of the m sets of N RF beams in two or more one-millisecond sub-frames of each LTE frame, such that the m sets of N RF beams are generated in a manner to enable operation of Hybrid-ARQ functionality with a p millisecond interval between a data packet transmission from a respective one of the plurality of mobile transceiver devices to the cellular LTE base transceiver station and an ACK or NAK sent from the cellular LTE base transceiver station in response to receipt of the data packet transmission, and a q millisecond interval between the data packet transmission and a retransmission of the same data packet from the respective one of the plurality of mobile transceiver devices if a NAK is received, wherein p and q are fixed integers and depend on the TDD Up/Down configuration, and further wherein the cellular LTE base transceiver station is adapted to generate at least one of a CQI (channel quality indicator) measurement command and an SRS (sounding reference signal) command to the respective one of the plurality of mobile transceiver devices and k milliseconds later, k a fixed integer depending on the TDD Up/Down configuration, the respective one of the plurality of mobile transceiver devices transmits at least one of a CQI measurement report and an SRS signal back to the base transceiver station, and wherein if the TDD Up/Down configuration is 5 or 6, m is equal to one, wherein if the TDD Up/Down configuration is 0, 1, 2, or 4, then m is equal to one or two, wherein if the TDD Up/Down configuration is 3, then m is equal to one, two, or three, and
• wherein when a mobile transceiver device first accesses the cellular LTE base transceiver station via one of a Random Access Procedure, a Handover Procedure, and a Service Request Procedure, the cellular LTE base transceiver station initiates an initial location determination algorithm that determines an initial location of the target mobile transceiver device by sending commands to the mobile transceiver device commanding it to send at least one of an aperiodic CQI measurement report and an aperiodic SRS signal to the cellular LTE base transceiver station in each of at least m sub-frames, where each of the m sub-frames is one in which a different set of N RF beams is generated by the agile beam forming antenna subsystem, and wherein the responses received by the cellular LTE base transceiver station from the mobile transceiver device are analyzed to determine at least one of the m times N RF beams generated by the agile beam forming antenna subsystem as being the best RF beam to cover the current location of the mobile transceiver device.

A method for locating and tracking cellular mobile transceiver devices within the areas covered by RF beams generated by an agile beam forming antenna subsystem, the method comprising:

• generating a number m different sets of fixed position patterns of a number N different RF beams, m and N being fixed positive integers, from an agile beam forming antenna subsystem of a cellular LTE base transceiver station adapted for RF time division duplexing (TDD), where the cellular LTE base transceiver station is in communication with a plurality of mobile transceiver devices within a cell coverage area of the cellular LTE base transceiver station, a cell being a sector operating a single carrier, each RF beam covering a sub-area of the cell coverage area where the m sets of N RF beams cover the cell coverage area,
• wherein m=1, 2, or 3, depending on the TDD Up/Down configuration, and the agile beam forming antenna subsystem is adapted to generate each of the m sets of N RF beams in two or more one-millisecond sub-frames of each LTE frame, such that the m sets of N RF beams are generated in a manner to enable operation of Hybrid-ARQ functionality with a p millisecond interval between a data packet transmission from a respective one of the plurality of mobile transceiver devices to the cellular LTE base transceiver station and an ACK or NAK sent from the cellular LTE base transceiver station in response to receipt of the data packet transmission, and a q millisecond interval between the data packet transmission and a retransmission of the same data packet from the respective one of the plurality of mobile transceiver devices if a NAK is received, wherein p and q are fixed integers and depend on the TDD Up/Down configuration, and further wherein the cellular LTE base transceiver station is adapted to generate at least one of a CQI (channel quality indicator) measurement command and an SRS (sounding reference signal) command to the respective one of the plurality of mobile transceiver devices and k milliseconds later, k a fixed integer depending on the TDD Up/Down configuration, the respective one of the plurality of mobile transceiver devices transmits at least one of a CQI measurement report and an SRS signal back to the base transceiver station, and wherein if the TDD Up/Down configuration is 5 or 6, m is equal to one, wherein if the TDD Up/Down configuration is 0, 1, 2, or 4, then m is equal to one or two, wherein if the TDD Up/Down configuration is 3, then m is equal to one, two, or three, and
• wherein when a mobile transceiver device first accesses the cellular LTE base transceiver station via one of a Random Access Procedure, a Handover Procedure, and a Service Request Procedure, the cellular LTE base transceiver station initiates an initial location determination algorithm that determines an initial location of the target mobile transceiver device by sending commands to the mobile transceiver device commanding it to send at least one of an aperiodic CQI measurement report and an aperiodic SRS signal to the cellular LTE base transceiver station in each of at least m sub-frames, where each of the m sub-frames is one in which a different set of N RF beams is generated by the agile beam forming antenna subsystem, and wherein the responses received by the cellular LTE base transceiver station from the mobile transceiver device are analyzed to determine at least one of the m times N RF beams generated by the agile beam forming subsystem as being the best RF beam to cover the current location of the mobile transceiver device.