Operational constraints in LTE TDD systems using RF agile beam forming techniques

摘要

Methods and systems having improved capabilities are described for providing communications to a plurality of cellular mobile devices through generating m different sets of fixed position patterns of N RF beams across the ten contiguous one-millisecond LTE sub-frames of each LTE time-division duplexing (TDD) frame from an agile beam forming antenna system of a cellular LTE base transceiver station. The cellular LTE base transceiver station is in RF TDD communication with the plurality of cellular mobile devices within a cell coverage area of the cellular LTE base transceiver station. Each RF beam covers a sub-area of the cell coverage area where the m times N RF beam patterns cover the area of the cell coverage area. The value of m is 1≦m≦3 and each one of the m sets of N RF beam patterns is generated in one or more of the non-S one-millisecond sub-frames of an LTE frame. The m sets of N RF beams are generated across any ten contiguous one-millisecond sub-frames. The value of m is determined at least in-part from a selected LTE TDD uplink/downlink (U/D) configuration.

主权项

1. A system for supporting cellular mobile transceiver device communications, comprising:
a cellular LTE base transceiver station that is adapted for RF time-division duplexing (TDD) communication with a plurality of mobile transceiver devices within a cell coverage area of a cell of the cellular LTE base transceiver station, wherein the cell is a sector that operates a single carrier, the cellular LTE wireless base transceiver station comprising an agile beam forming antenna subsystem that is adapted to generate a number m different sets of fixed-position patterns of a number N RF beams, wherein each of the N RF beams transmitted in a given time interval is sized to cover a corresponding sub-area of the cell coverage area with the cell coverage area being covered by the number m times the number N RF beams, wherein 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, 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, and wherein if the TDD Up/Down configuration is 3, then m is equal to one, two, or three.