IP Library › Granted Patent US 12,408,190
Granted Patent B2
US 12,408,190 · App. 18/455,432 · Granted Sep 2, 2025

Multi-user MIMO systems and methods

Inventors: Ming Jia (Ottawa, CA); Jianming Wu (Kanata, CA); Dong-Sheng Yu (Nepean, CA); Peiying Zhu (Kanata, CA); Wen Tong (Ottawa, CA)
Assignee: Malikie Innovations Limited
H04W72/542H04B7/0452H04B7/0478H04B7/0628H04B7/063H04B7/0632H04B7/0697H04L1/0003H04L1/0009H04L1/0015H04L1/0026H04L1/0675H04L5/0023H04L5/0057H04W24/08H04W72/563H04B7/0673
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Quick Facts
Patent No.
US 12,408,190
App. No.
18/455,432
Granted
Sep 2, 2025
Kind
B2
Abstract

A method and system are provided for scheduling data transmission in a Multiple-Input Multiple-Output (MIMO) system. The MIMO system may comprise at least one MIMO transmitter and at least one MIMO receiver. Feedback from one or more receivers may be used by a transmitter to improve quality, capacity, and scheduling in MIMO communication systems. The method may include generating or receiving information pertaining to a MIMO channel metric and information pertaining to a Channel Quality Indicator (CQI) in respect of a transmitted signal; and sending a next transmission to a receiver using a MIMO mode selected in accordance with the information pertaining to the MIMO channel metric, and an adaptive coding and modulation selected in accordance with the information pertaining to the CQI.

Claims (34)

1. A base station comprising:

a transceiver; and

a processor operationally coupled to the transceiver;

wherein the processor is configured to:

receive, via the transceiver, channel state information (CSI) feedback that includes any one or a combination of a channel quality indicator (CQI) and a rank of a multiple-input multiple-output (MIMO) channel; and

transmit, via the transceiver, a MIMO transmission using a number of transmission antennas based on the CSI feedback, wherein the number of transmission antennas is based on the rank and an adaptive coding and modulation type for the transmission selected is based on the CQI.

2. The base station of claim 1 , wherein a data transmission rate of the MIMO transmission is based on the selected adaptive coding and modulation type.

3. The base station of claim 2 , wherein data transmission rates of subsequent MIMO transmissions can be increased, decreased, or maintained at a constant level based on the received CSI feedback.

4. The base station of claim 1 , wherein the MIMO transmission is an Orthogonal Frequency Division Multiplexing (OFDM) transmission.

5. The base station of claim 1 , wherein the MIMO transmission includes data and pilot signals, wherein the pilot signals are inserted on each antenna in a set of sub-carriers and OFDM symbol durations.

6. A method for use by a base station, the method comprising:

receiving channel state information (CSI) feedback that includes any one or a combination of a channel quality indicator (CQI) and a rank of a multiple-input multiple-output (MIMO) channel; and

transmitting a MIMO transmission using a number of transmission antennas based on the CSI feedback, wherein the number of transmission antennas is based on the rank and an adaptive coding and modulation type for the transmission is selected based on the CQI.

7. The method of claim 6 , wherein a data transmission rate of the MIMO transmission is based on the selected adaptive coding and modulation type.

8. The method of claim 7 , wherein data transmission rates of the subsequent MIMO transmissions can be increased, decreased, or maintained at a constant level based on the received CSI feedback.

9. The method of claim 6 , wherein the MIMO transmission is via an Orthogonal Frequency Division Multiplexing (OFDM) transmission.

10. The method of claim 6 , wherein the MIMO transmission includes data and pilot signals, wherein the pilot signals are inserted on each antenna in a set of sub-carriers and OFDM symbol durations.

11. A user equipment (UE) comprising:

a transceiver;

a processor, operatively coupled to the transceiver,

wherein the transceiver and the processor are configured to:

transmit, via the transceiver, channel state information (CSI) feedback that includes any one or a combination of a channel quality indicator (CQI) and a rank of a multiple-input multiple-output (MIMO) channel; and

receive, via the transceiver, a MIMO transmission based on the CSI feedback, wherein the rank is used for selecting a number of transmission antennas for the MIMO transmission and the CQI is used for selecting an adaptive coding and modulation type for the MIMO transmission.

12. The UE of claim 11 , wherein a data transmission rate of the MIMO transmission is based on the CSI feedback.

13. The UE of claim 12 , wherein data transmission rates of the subsequent MIMO transmissions can be increased, decreased, or maintained at a constant level based on the transmitted CSI feedback.

14. The UE of claim 11 , wherein the MIMO transmission is an Orthogonal Frequency Division Multiplexing (OFDM) transmission.

15. The UE of claim 11 , wherein the MIMO transmission includes data and pilot signals, wherein the pilot signals are inserted on each antenna in a set of sub-carriers and OFDM symbol durations.

16. A method for use by a user equipment (UE), the method comprising:

transmitting channel state information (CSI) feedback that includes any one or a combination of a channel quality indicator (CQI) and a rank of a multiple-input multiple-output (MIMO) channel; and

receiving a MIMO transmission based on the CSI feedback, wherein the rank is used for selecting a number of transmission antennas for the MIMO transmission and the CQI is used for selecting an adaptive coding and modulation type for the MIMO transmission.

17. The method of claim 16 , wherein a data transmission rate of the MIMO transmission is based on the CSI feedback.

18. The method of claim 17 , wherein data transmission rates of the subsequent MIMO transmissions can be increased, decreased, or maintained at a constant level based on the transmitted CSI feedback.

19. The method of claim 16 , wherein the MIMO transmission is an Orthogonal Frequency Division Multiplexing (OFDM) transmission.

20. The method of claim 16 , wherein the MIMO transmission includes data and pilot signals, wherein the pilot signals are inserted on each antenna in a set of sub-carriers and OFDM symbol durations.

Continuity (12)
Continuation 17678456 · Feb 23, 2022
Continuation 17097907 · Nov 13, 2020
Continuation 16384478 · Apr 15, 2019
Continuation 15881575 · Jan 26, 2018
Continuation 15360600 · Nov 23, 2016
Continuation 14832758 · Aug 21, 2015
Continuation 13971534 · Aug 20, 2013
Continuation 13608234 · Sep 10, 2012
Continuation 13251394 · Oct 3, 2011
Continuation 12089938
Provisional Application 60725951 · Oct 12, 2005
Related Publication 20240098774A1 · Mar 21, 2024
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