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"Multi-Rank Precoding Matrix Indicator (Pmi) Feedback in a Multiple-Input Multiple-Output (Mimo) System" in Patent Application Approval Process

July 9, 2014



By a News Reporter-Staff News Editor at Telecommunications Weekly -- A patent application by the inventors Chen, Runhua (Dallas, TX); Onggosanusi, Eko N. (Allen, TX), filed on September 3, 2013, was made available online on June 26, 2014, according to news reporting originating from Washington, D.C., by VerticalNews correspondents.

This patent application has not been assigned to a company or institution.

The following quote was obtained by the news editors from the background information supplied by the inventors: "Multiple-input multiple-output (MIMO) wireless systems are those that have multiple antennas on the transmitter side and the receiver side. One way to exploit the number of antennas in a MIMO wireless system is referred to as 'spatial multiplexing', where different data streams are transmitted in parallel from different transmit antennas and where multiple receive antennas are used to separate the different data streams and the receiver. With spatial multiplexing, a node (eNB) may send multiple data streams (or layers) to user equipment (UEs) in downlink transmission using the same frequency. The number of such layers or streams for a downlink transmission is referred to as 'the rank'. In Long Term Evolution (LTE) Release 8 standard, each UE estimates the downlink (DL) channel and reports the recommended rank indicator (RI) to eNB. Each UE also reports the channel quality indicator (CQI) and the precoding matrix indicator (PMI) which is an index to the precoding matrix in a codebook. These indicators provide a set of recommended transmission properties to eNB. Upon receiving this feedback (RI/PMI/CQI) from UEs, the eNB performs corresponding downlink MIMO transmission scheduling.

"Implicit CSI (CQI/PMI/RI) feedback is based on a pre-defined set of codebooks, which are a set of matrices calculated offline and known at the eNB and UEs. The codebook of rank-r consists of a number of Nt.times.r matrices where Nt is the number of eNB transmit antennas. The UE feedback includes the RI, PMI and CQI mentioned above. RI refers to a preferred transmission rank (number of data streams), ranging from 1 to min(Nt,Nr), where Nr is the number of receive antennas. PMI refers to a UE recommended precoding matrix index in the rank-r codebook. For evolved UMTS Terrestrial Radio Access (E-UTRA) LTE Release 8, a single PMI is reported for each frequency subband, corresponding to the RI report. CQI refers to the quality of the channel (e.g., supportable data rate and/or signal-to-noise ratio). The reported CQI is associated with the reported PMI."

In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "In at least some embodiments, a system includes a multiple-input multiple-output (MIMO) base station and a plurality of MIMO user equipment (UE) devices in communication with the MIMO base station. The MIMO base station is configured to switch between a single-user (SU)-MIMO mode and a multiple-user (MU)-MIMO mode during communications with the plurality of MIMO UE devices based on multi-rank precoding matrix indicator (PMI) feedback received from at least one of the MIMO UE devices.

"In accordance with at least some embodiments, an electronic device includes MIMO transceiver logic and multi-rank precoding matrix indicator (PMI) feedback reporting logic coupled to the MIMO transceiver logic. The multi-rank PMI feedback reporting logic enables the electronic device to selectively switch between a single-user (SU)-MIMO mode and a multiple-user (MU)-MIMO mode.

"In accordance with at least some embodiments, a method includes receiving, by a MIMO base station, multi-rank precoding matrix indicator (PMI) feedback from user equipment (UE) devices. The method also includes switching, by the MIMO base station, between a single-user (SU)-MIMO mode and a multiple-user (MU)-MIMO mode for communications with the UE devices based on the received multi-rank PMI feedback.

BRIEF DESCRIPTION OF THE DRAWINGS

"For a detailed description of exemplary embodiments of the invention, reference will now be made to the accompanying drawings in which:

"FIG. 1 shows an illustrative embodiment of a multiple-input multiple-output (MIMO) wireless communication system in accordance with an embodiment of the disclosure;

"FIG. 2 shows additional components of the MIMO base station of FIG. 1 in accordance with an embodiment of the disclosure;

"FIG. 3 shows additional components of the MIMO user equipment (UE) device of FIG. 1 in accordance with an embodiment of the disclosure;

"FIGS. 4A-4C show time charts for multi-rank precoding matrix indicator (PMI) feedback reporting in accordance with embodiments of the disclosure; and

"FIG. 5 shows a method in accordance with an embodiment of the disclosure."

URL and more information on this patent application, see: Chen, Runhua; Onggosanusi, Eko N. Multi-Rank Precoding Matrix Indicator (Pmi) Feedback in a Multiple-Input Multiple-Output (Mimo) System. Filed September 3, 2013 and posted June 26, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4511&p=91&f=G&l=50&d=PG01&S1=20140619.PD.&OS=PD/20140619&RS=PD/20140619

Keywords for this news article include: Patents.

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Source: Telecommunications Weekly


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