Baseband data transmission and reception in an LTE wireless base station employing periodically scanning RF beam forming techniques

摘要

The present disclosure is related to a large-scale broadband wireless network capable of providing a very high wireless data capacity, wherein one aspect of the system utilizes a periodic beam forming system. When a wireless base station cell operates a periodic beam forming system, it is necessary to locate each user served by the cell within a sub-area covered by one of the m times N RF beams generated by the system. Methods for locating users within RF beam sub-areas are disclosed herein, where a user may be scheduled for transmission or reception only when an RF beam is focused on the sub-area that covers the user location. The present disclosure pertains to the systems and methods that may be used to process transmissions of and receptions by the baseband system of an LTE wireless base station that employs a periodic beam forming RF and antenna system.

主权项

1. A system for baseband data transmission and reception in cellular mobile transceiver device communications, the system comprising:
a cellular LTE base transceiver station adapted for RF frequency division duplexing (FDD) communication with a plurality of mobile transceiver devices within a cell coverage area of the cellular LTE base transceiver station, the cellular LTE base transceiver station comprising a digital baseband processing facility, a digital interface, an RF facility, and an agile beam forming antenna system; wherein the cellular LTE base transceiver station is in communication with the plurality of mobile transceiver devices through a cell-wide RF transmit signal, a cell-wide RF receive signal, plus a number m different sets of fixed-position patterns of a number N RF transmit beams and a number N RF receive beams, each of the N RF transmit and N RF receive beams covering a corresponding sub-area of the cell coverage area, wherein the cell coverage area is covered by the m different sets of times N RF transmit or receive beams, wherein the agile beam forming antenna system 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 the 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 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, wherein the cellular LTE base transceiver station is adapted to generate at least one of a CQI measurement command and an SRS 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, and wherein, to enable Hybrid-ARQ functionality and to preserve the use of CQI and SRS operation when generating a particular RF beam rotation pattern, the number m of different sets of N RF beams is limited to 1, 2, 3, or 4; wherein the digital baseband processing facility provides N transmit beam digital data streams and a cell-wide transmit digital data stream to the RF facility through the digital interface for transmission through the agile beam forming antenna system, and the RF facility provides N receive beam digital data streams and a cell-wide receive digital data stream from the agile beam forming antenna system to the digital baseband processing facility through the digital interface; and wherein the digital baseband processing facility processes transmissions to the respective one of the plurality of mobile transceiver devices through at least one of the N transmit beam digital data streams and the cell-wide transmit digital data stream for transmission in at least one of the m sets of N RF beams and the cell-wide RF transmit signal, and processes receptions from the respective one of the plurality of mobile transceiver devices through at least one of the N receive beam digital data streams and the cell-wide receive digital data stream from at least one of the m sets of N RF receive beams and the cell-wide RF receive signal.