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.
Technologies
Multiple-Input Multiple-Output(MIMO)/Massive MIMO Channel Status Information(CSI) Reporting
Product
Use Cases
Wireless communication
Services
Claim
1. An electronic device, comprising:
at least a first antenna;
multiple-input multiple-output (MIMO) transceiver logic coupled to the at least first antenna; and
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 multi-rank 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 the electronic device, 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 electronic device.
2. The electronic device of claim 1 wherein the multi-rank PMI feedback reporting logic is configured to report said first and second PMIs periodically, wherein the reporting periodicity of said second PMI is not equal to the reporting periodicity of said first PMI.
3. The electronic device of claim 1 wherein the multi-rank PMI feedback reporting logic is configured to generate report with said pre-defined restricted rank value in accordance with a previously received higher layer control signal.
4. The electronic device of claim 1 wherein the multi-rank PMI feedback reporting logic receives reporting instructions for said first PMI and said second PMI, and wherein said reporting instructions are jointly encoded in a UE-specific higher-layer control signal.
5. The electronic device of claim 1, wherein the electronic device is configured to select use of one multi-rank PMI feedback reporting configuration among a plurality of multi-rank PMI feedback reporting configurations.
6. A method, comprising:
receiving, by a multiple-input multiple-output (MIMO) base station, multi-rank precoding matrix indicator (PMI) feedback from at least one MIMO user equipment (UE) device; and
switching, by the MIMO base station, between a single-user (SU)-MIMO mode and a multiple-user (MU)-MIMO mode for communications with a first MIMO UE device based on the received multi-rank PMI feedback;
wherein receiving multi-rank PMI feedback comprises receiving:
a first PMI corresponding to a recommended precoding matrix for SU-MIMO communications between the MIMO base station and at least one MIMO UE device, 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 at least one MIMO UE device.
7. The method of claim 6 wherein receiving multi-rank PMI feedback comprises receiving said first and second PMIs periodically, wherein the reporting periodicity of said second PMI is not equal to the reporting periodicity of said first PMI.
8. The method of claim 6 further comprising transmitting a higher layer control signal to configure use of said pre-defined restricted rank value for said multi-rank PMI feedback.
9. The method of claim 6 further comprising encoding, in a UE-specific higher-layer control signal, the reporting configuration for said first PMI and said second PMI.
Associated Portfolios
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Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.