IP Library Granted Patent US 9,219,533
Granted Patent B2
US 9,219,533 · App. 13/415,463 · Granted Dec 22, 2015

Systems and methods for downlink scheduling in multiple input multiple output wireless communications systems

View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 9,219,533
App. No.
13/415,463
Granted
Dec 22, 2015
Kind
B2
Abstract

Systems and methods for downlink scheduling in wireless communications systems are described. In some embodiments, a method includes: applying channel prediction at a transmitter for transmitting information to one or more mobile devices; predicting channel state information for a channel over which the information is transmitted, the channel state information being based, at least, on the channel prediction; determining a precoding matrix to apply to the information, the determining the precoding matrix being based, at least, on predicted channel state information; and scheduling transmission of the information to the one or more mobile devices based, at least, on an asymptotic ergodic rate for the one or more mobile devices. The asymptotic ergodic rate can be based on large-scale channel behavior and a maximum Doppler shift between the mobile devices.

Claims (25)

1. A method, comprising:

applying, by a device comprising a processor, channel prediction at a base station device for transmitting information to one or more mobile devices of a plurality of mobile devices, wherein the device is distinct from the one or more mobile devices;

predicting channel state information for a downlink channel over which the information is transmitted, the channel state information being based, at least, on the channel prediction;

determining a precoding matrix to apply to the information transmitted over the downlink channel from the base station device based, at least, on the channel state information; and

scheduling transmission of the information to the one or more mobile devices of the plurality of mobile devices, wherein the scheduling comprises:

receiving, from the plurality of mobile devices, respective frame-level feedback at a first portion of a defined frame, wherein the respective frame-level feedback comprises respective average signal-to-noise ratios from cooperating base station devices for the set of mobile devices and respective Doppler shift information for the plurality of mobile devices; and

scheduling the transmission to the one or more mobile devices of the plurality of mobile devices on the downlink channel during the defined frame, wherein the one or more mobile devices to which the transmission is made is selected based on an evaluation of respective asymptotic ergodic rates for the plurality of mobile devices.

2. The method of claim 1 , wherein the respective asymptotic ergodic rates are based on the respective average signal-to-noise ratios and the respective Doppler shift information for the plurality of mobile devices.

3. The method of claim 1 , wherein the respective Doppler shift information comprises respective maximum Doppler shifts for the plurality of mobile devices.

4. A device having a processor, comprising:

a channel prediction component configured to apply channel prediction at a base station device for transmission of information from the base station device to one or more mobile devices;

a channel state information prediction component configured to predict channel state information for a channel over which the information is transmitted, the channel state information being based, at least, on the channel prediction applied by the channel prediction component;

a precoding matrix component configured to determine a precoding matrix to apply to the information based, at least, on the channel state information from the channel state information component; and

a scheduling component configured to schedule the transmission of the information from the base station device to the one or more mobile devices based, at least, on an asymptotic ergodic rate for the one or more mobile devices, wherein the scheduling comprises a first stage and a second stage of feedback from the one or more mobile devices,

wherein the first stage of feedback comprises frame-level feedback associated with signal-to-noise information and Doppler shift information received from the one or more mobile devices, and

wherein the second stage of feedback comprises slot-level feedback associated with a small-scale channel coefficient for a slot received from the one or more mobile devices.

5. The device of claim 4 , wherein the device is a central control unit distinct from the base station device.

6. The device of claim 4 , wherein the asymptotic ergodic rate for the one or more mobile devices is based, at least, on large-scale channel behavior.

7. The device of claim 4 , wherein the asymptotic ergodic rate for the one or more mobile devices is based, at least, on a maximum Doppler shift for the one or more mobile devices.

8. A non-transitory computer-readable storage medium having computer-executable instructions that, in response to execution, cause a device including a processor to perform operations, comprising:

determining information indicative of channel prediction at a base station device, wherein the information is associated with channel state information for a channel from the base station device to a receiver device; and

scheduling transmission of data to a plurality of mobile devices, wherein the scheduling comprises, for the plurality of mobile devices:

computing respective first asymptotic ergodic rates for a first mode and computing respective second asymptotic ergodic rates for a second mode; and

scheduling the transmission according to the first mode based on a determination that a first asymptotic ergodic rate of the respective first asymptotic ergodic rates is larger than a second asymptotic ergodic rate of the respective second asymptotic ergodic rates, and scheduling the transmission according to the second mode based on a determination that the second asymptotic ergodic rate is larger than the first asymptotic ergodic rate.

9. The non-transitory computer-readable storage medium of claim 8 , wherein the scheduling the transmission of the data comprises scheduling the transmission of the data to a mobile device during a defined time frame.

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 13, 2020
From: GLOBAL INNOVATION AGGREGATORS, LLC
To: K.MIZRA LLC
Reel/Frame 051579/0773 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 20, 2017
From: CLAPTON HOLDINGS INC.
To: GLOBAL INNOVATION AGGREGATORS LLC
Reel/Frame 044453/0029 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 7, 2017
From: TRANSPACIFIC IP MANAGEMENT GROUP LTD.
To: CLAPTON HOLDINGS INC.
Reel/Frame 044055/0048 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 1, 2012
From: TSENG, LI-CHUAN; HANIF, AHMED FARHAN; HUANG, CHINGYAO
To: TRANSPACIFIC IP MANAGEMENT GROUP LTD.
Reel/Frame 028134/0945 →