US 11,489,559 B2 · Scheduling multi-user MIMO transmissions in fixed wireless access systems

Abstract

Described are devices, systems and methods for scheduling multi-user (MU) multiple input multiple output (MIMO) transmissions in a fixed wireless access (FWA) system. One method for scheduling a large number of user devices in a wireless communication system includes a preselection process to pare down the number of user devices to be simultaneously scheduled, and then scheduling that subset of users. In an example, and assuming each user device communicates over a corresponding wireless channel, the preselection process includes determining a number of sets based on a first characteristic of the wireless channels, where each set includes at least one user device, and then determining a subset of user devices by selecting at most one user device from each of the sets. The scheduling of the selected subset of users is based on a scheduling algorithm and a second characteristic of the wireless channels.

Claims19

Dependent claims

A method for scheduling a plurality of user devices in a fixed wireless access (FWA) system characterized by a temporal Rice factor being greater than a threshold, each of the plurality of user devices communicating over a corresponding channel of a plurality of wireless channels, the method comprising:

determining a plurality of sets based on a first characteristic of the plurality of wireless channels, wherein each of the plurality of sets comprises at least one of the plurality of user devices, and wherein the first characteristic comprises a time-invariant part of each of the plurality of wireless channels;
determining a subset of user devices by selecting at most one user device from each of the plurality of sets;
and
scheduling simultaneous transmissions by each of the subset of user devices based on a scheduling algorithm and a second characteristic of the plurality of wireless channels, wherein the second characteristic comprises both the time-invariant part and a time-varying part of the plurality of wireless channels, and
wherein the temporal Rice factor is based on a ratio of the time-invariant part of the corresponding channel to the time-varying part of the corresponding channel.

2 more elements

A device for scheduling a plurality of user devices in a fixed wireless access (FWA) system characterized by a temporal Rice factor being greater than a threshold, each of the plurality of user devices communicating over a corresponding channel of a plurality of wireless channels, the device comprising:

a processor configured to:
determine a plurality of sets based on a first characteristic of the plurality of wireless channels, wherein each of the plurality of sets comprises at least one of the plurality of user devices, and wherein the first characteristic comprises a time-invariant part of each of the plurality of wireless channels;
determine a subset of user devices by selecting at most one user device from each of the plurality of sets;
and
schedule simultaneous transmissions by each of the subset of user devices based on a scheduling algorithm and a second characteristic of the plurality of wireless channels, wherein the second characteristic comprises both a time-invariant and a time-varying part of the plurality of wireless channels, and wherein the temporal Rice factor is based on a ratio of the time-invariant part of the corresponding channel to the time-varying part of the corresponding channel.

2 more elements

a processor configured to:
determine a plurality of sets based on a time-invariant part of the plurality of wireless channels, wherein each of the plurality of sets comprises at least one of the plurality of user devices;
determine a subset of user devices by selecting at most one user device from each of the plurality of sets;
and
schedule simultaneous multiple input multiple output (MIMO) transmissions by each of the subset of user devices based on a scheduling algorithm and both the time-invariant part and a time-varying part of the plurality of wireless channels, wherein the temporal Rice factor is based on a ratio of the time-invariant part of the corresponding channel to the time-varying part of the corresponding channel.

2 more elements

Dependencies are inferred from the claim text.

Scheduling multi-user MIMO transmissions in fixed wireless access systems

Life of this patent

Scheduling multi-user MIMO transmissions in fixed wireless access systems

Life of this patent

Abstract

Claims19