MIMO system with multiple spatial multiplexing modes
First Claim
1. A method of transmitting data in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
- selecting at least one user terminal for data transmission;
selecting a spatial multiplexing mode, from among a plurality of spatial multiplexing modes supported by the system, to use for the at least one user terminal, wherein the spatial multiplexing mode is selected between a steered spatial multiplexing mode and a non-steered spatial multiplexing mode;
selecting a plurality of rates for a plurality of data streams to be transmitted via a plurality of spatial channels of a MIMO channel for the at least one user terminal; and
scheduling the at least one user terminal for data transmission with the plurality of selected rates and the selected spatial multiplexing mode; and
sending information regarding the scheduling to the at least one user terminal via a wireless channel.
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Accused Products
Abstract
A MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility. These modes may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a single-user non-steered mode that transmits multiple data streams from multiple antennas to a single receiver without spatial processing at a transmitter, (3) a multi-user steered mode that transmits multiple data streams simultaneously to multiple receivers with spatial processing at a transmitter, and (4) a multi-user non-steered mode that transmits multiple data streams from multiple antennas (co-located or non co-located) without spatial processing at the transmitter(s) to receiver(s) having multiple antennas. For each set of user terminal(s) selected for data transmission on the downlink and/or uplink, a spatial multiplexing mode is selected for the user terminal set from among the multiple spatial multiplexing modes supported by the system.
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Citations
24 Claims
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1. A method of transmitting data in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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selecting at least one user terminal for data transmission; selecting a spatial multiplexing mode, from among a plurality of spatial multiplexing modes supported by the system, to use for the at least one user terminal, wherein the spatial multiplexing mode is selected between a steered spatial multiplexing mode and a non-steered spatial multiplexing mode; selecting a plurality of rates for a plurality of data streams to be transmitted via a plurality of spatial channels of a MIMO channel for the at least one user terminal; and scheduling the at least one user terminal for data transmission with the plurality of selected rates and the selected spatial multiplexing mode; and sending information regarding the scheduling to the at least one user terminal via a wireless channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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a terminal selector operative to select at least one user terminal for data transmission; a mode selector operative to select a spatial multiplexing mode, from among a plurality of spatial multiplexing modes supported by the system, to use for the at least one user terminal, wherein the spatial multiplexing mode is selected between a steered spatial multiplexing mode and a non-steered spatial multiplexing mode; a rate selector operative to select a plurality of rates for a plurality of data streams to be transmitted via a plurality of spatial channels of a MIMO channel for the at least one user terminal; and a scheduling processor operative to schedule the at least one user terminal for data transmission with the plurality of selected rates and the selected spatial multiplexing mode. - View Dependent Claims (17, 18)
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19. An apparatus in a wireless multiple-access multiple-input multiple-output (MIMO) communication system, comprising:
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means for selecting at least one user terminal for data transmission; means for selecting a spatial multiplexing mode, from among a plurality of spatial multiplexing modes supported by the system, to use for the at least one user terminal, wherein the spatial multiplexing mode is selected between a steered spatial multiplexing mode and a non-steered spatial multiplexing mode; means for selecting a plurality of rates for a plurality of data streams to be transmitted via a plurality of spatial channels of a MIMO channel for the at least one user terminal; and means for scheduling the at least one user terminal for data transmission with the plurality of selected rates and the selected spatial multiplexing mode. - View Dependent Claims (20, 21)
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22. A computer-program apparatus for use in a wireless multiple-input multiple-output (MIMO) communication system comprising a memory unit having a set of software codes stored thereon, the set of software codes being executable by one or more processors and the set of software codes comprising:
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software codes for selecting at least one user terminal for data transmission; software codes for selecting a spatial multiplexing mode, from among a plurality of spatial multiplexing modes supported by the system, to use for the at least one user terminal, wherein the spatial multiplexing mode is selected between a steered spatial multiplexing mode and a non-steered spatial multiplexing mode; software codes for selecting a plurality of rates for a plurality of data streams to be transmitted via a plurality of spatial channels of a MIMO channel for the at least one user terminal; and software codes for scheduling the at least one user terminal for data transmission with the plurality of selected rates and the selected spatial multiplexing mode. - View Dependent Claims (23, 24)
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Specification