Downlink user equipment selection
First Claim
1. A network system comprising:
- a plurality of transmit antenna elements of one or more serving nodes; and
a scheduler in communication with the plurality of transmit antenna elements, the scheduler comprising a processor and computer-executable instructions, wherein the computer-executable instructions, when executed by the processor, cause the scheduler to;
determine downlink channel information for channels between a plurality of receive antenna elements associated with a plurality of user equipment (UEs) and the plurality of transmit antenna elements;
determine, for each receive antenna element in the plurality, a channel strength based on the downlink channel information;
order the plurality of receive antenna elements based on the determined channel strengths; and
in order from highest-ordered receive antenna element to lowest-ordered receive antenna element, select the respective receive antenna element to be served by one or more of the plurality of transmit antenna elements during a first time slot in response to a determination that;
a measurement that represents a spatial orthogonality between the respective receive antenna element and one or more spatial elements of one or more other receive antenna elements in the plurality selected to be served by one or more of the plurality of transmit antenna elements is greater than a threshold value, anda number of spatial dimensions provided by one or more receive antenna elements in the plurality selected to be served by one or more of the plurality of transmit antenna elements does not exceed a number of transmit antenna elements in the plurality of transmit antenna elements.
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Accused Products
Abstract
Aspects of the disclosure relate to a selection scheme implemented by a scheduler in a multiple-input multiple-output (MIMO) network to identify which users to schedule simultaneously during the same time slot. For downlink communications and a particular frequency wholeband or sub-band, the scheduler can determine downlink channel information using uplink channel information for channels between base stations and UEs. The scheduler can then determine a strength of the channels using the downlink channel information, order the UEs using a fairness metric based on the channel strengths, and compute one or more QR decompositions to identify whether a spatial dimension of a UE is roughly or approximately orthogonal to spatial dimension(s) of other UEs selected to be served during a time slot being scheduled. If the spatial dimensions are roughly or approximately orthogonal, the scheduler selects the UE to be served at the same time as other UEs already selected.
585 Citations
20 Claims
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1. A network system comprising:
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a plurality of transmit antenna elements of one or more serving nodes; and a scheduler in communication with the plurality of transmit antenna elements, the scheduler comprising a processor and computer-executable instructions, wherein the computer-executable instructions, when executed by the processor, cause the scheduler to; determine downlink channel information for channels between a plurality of receive antenna elements associated with a plurality of user equipment (UEs) and the plurality of transmit antenna elements; determine, for each receive antenna element in the plurality, a channel strength based on the downlink channel information; order the plurality of receive antenna elements based on the determined channel strengths; and in order from highest-ordered receive antenna element to lowest-ordered receive antenna element, select the respective receive antenna element to be served by one or more of the plurality of transmit antenna elements during a first time slot in response to a determination that; a measurement that represents a spatial orthogonality between the respective receive antenna element and one or more spatial elements of one or more other receive antenna elements in the plurality selected to be served by one or more of the plurality of transmit antenna elements is greater than a threshold value, and a number of spatial dimensions provided by one or more receive antenna elements in the plurality selected to be served by one or more of the plurality of transmit antenna elements does not exceed a number of transmit antenna elements in the plurality of transmit antenna elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A computer-implemented method comprising:
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determining downlink channel information for channels between a plurality of receive antenna elements associated with a plurality of user equipment (UEs) and a plurality of transmit antenna elements associated with a plurality of serving nodes; determining, for each receive antenna element in the plurality, a channel strength based on the downlink channel information; ordering the plurality of receive antenna elements based on the determined channel strengths; and in order from highest-ordered receive antenna element to lowest-ordered receive antenna element, selecting the respective receive antenna element to be served by one or more of the plurality of transmit antenna elements during a first time slot in response to a determination that a measurement that represents a spatial orthogonality between the respective receive antenna element and one or more spatial elements of one or more other receive antenna elements in the plurality selected to be served by one or more of the plurality of transmit antenna elements is greater than a threshold value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. Non-transitory, computer-readable storage media comprising computer-executable instructions, wherein the computer-executable instructions, when executed by a scheduler in a baseband unit, cause the baseband unit to:
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determine downlink channel information for channels between a plurality of receive antenna elements associated with a plurality of user equipment (UEs) and a plurality of transmit antenna elements associated with a plurality of serving nodes; determine, for each receive antenna element in the plurality, a channel strength based on the downlink channel information; order the plurality of receive antenna elements based on the determined channel strengths; and in order from highest-ordered receive antenna element to lowest-ordered receive antenna element, select the respective receive antenna element to be served by one or more of the plurality of transmit antenna elements during a first time slot in response to a determination that a measurement that represents a spatial orthogonality between the respective receive antenna element and one or more spatial elements of one or more other receive antenna elements in the plurality selected to be served by one or more of the plurality of transmit antenna elements satisfies a threshold value.
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Specification