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US 8,526,519 B2Granted
Multi-rank precoding matrix indicator (PMI) feedback in a multiple-input multiple-output (MIMO) system
AssigneeTexas Instruments Incorporated
InventorsRunhua Chen, Eko N. Onggosanusi
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Abstract
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.
Claims17
A system, comprising:
- a multiple-input multiple-output (MIMO) base station;
- a plurality of MIMO user equipment (UE) devices in communication with the MIMO base station;
- wherein 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;
- wherein the multirank PMI feedback comprises:
- a first PMI corresponding to a recommended precoding matrix for SU-MIMO communications between the MIMO base station and the plurality of MIMO UE devices, and a rank indicator (RI) corresponding to the rank value of the first PMI;
- and
- a second PMI corresponding to a precoding matrix of a pre-defined restricted rank value applicable for MU-MIMO communications between the base station and the plurality of MIMO UE devices.
4 more elements
A system, comprising:
- a multiple-input multiple-output (MIMO) base station;
- and
- a plurality of MIMO user equipment (UE) devices in communication with the MIMO base station, wherein 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 precodinq matrix indicator (PMI) feedback received from at least one of the MIMO UE devices and wherein the MIMO base station transmits a control signal to the UE devices to configure each MIMO UE device to switch from one type of multi-rank PMI feedback reporting to another type of multi-rank PMI feedback reporting.
An electronic device, comprising:
- multiple-input multiple-output (MIMO) transceiver logic;
- multi-rank precoding matrix indicator (PMI) feedback reporting logic coupled to the MIMO transceiver logic,
- wherein 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;
- wherein the multirank PMI feedback reporting logic generates a report comprising:
- a first PMI corresponding to a recommended precoding matrix for SU-MIMO communications between a MIMO base station and a plurality of MIMO user equipment (UE) devices, and a rank indicator (RI) corresponding to the rank value of the first PMI;
- and
- a second PMI corresponding to a precoding matrix of a pre-defined restricted rank value applicable for MU-MIMO communications between the MIMO base station and the plurality of MIMO UE devices.
4 more elements
An electronic device, comprising:
- multiple-input multiple-output (MIMO) transceiver logic;
- and
- multi-rank precodinq matrix indicator (PMI) feedback reporting logic coupled to the MIMO transceiver logic, wherein 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 and wherein the multi-rank PMI feedback reporting logic comprises multi-rank PMI feedback report selection logic configured to select use of one multi-rank PMI feedback reporting configuration among a plurality of multi-rank PMI feedback reporting configurations.
A method, comprising:
- receiving, by a multiple-input multiple-output (MIMO) base station, multi-rank precoding matrix indicator (PMI) feedback from MIMO user equipment (UE) devices;
- and
- switching, by the MIMO base station, between a single-user (SU)-MIMO mode and a multiple-user (MU)-MIMO mode for communications with the MIMO UE devices based on the received multi-rank PMI feedback;
- wherein receiving multirank PMI feedback comprises:
- receiving a first PMI corresponding to a recommended precoding matrix for SU-MIMO communications between the MIMO base station and the MIMO UE devices, and a rank indicator (RI) corresponding to the rank value of the first PMI;
- and
- receiving a second PMI corresponding to a precoding matrix of a pre-defined restricted rank value applicable for MU-MIMO communications between the MIMO base station and the MIMO UE devices.
4 more elements
Dependencies are inferred from the claim text.