Hierarchical channel sounding and channel state information feedback in massive MIMO systems
First Claim
1. A method, comprising:
- configuring, by a base station (BS), hierarchical channel sounding, each using a different transmitter spatial processing scheme, wherein the hierarchical channel sounding comprises synchronization signals, sector-level reference signals, and slice-level reference signals;
establishing, by the BS, the hierarchical channel sounding associated with the different transmitter spatial processing scheme to at least one mobile station (MS) over a massive multi-input multi-output (MIMO) channel, wherein the different transmitter spatial processing scheme is determined by a different set of multiple angle of departures, and a different set of transmitter codebooks or a different set of transmitter precoders;
receiving, by the BS, a feedback signal from the at least one MS over the massive MIMO channel, wherein the feedback signal includes at least one preferred slice information associated with the slice-level reference signals that have been transmitted to the MS;
determining, by the BS, an actual slice in accordance with the feedback information, long-term channel state information (CSI) received from the at least one MS, and short-term CSI received from the at least one MS, wherein the long-term CSI is determined by the synchronization signals and the sector-level reference signals, and the short-term CSI is determined by the slice-level reference signals included in the hierarchical channel sounding; and
transmitting one or more reference signals associated with the determined actual slice to the at least one MS, wherein the actual slice is an active slice providing a communication between the at least one MS and the BS, and wherein the reference signals associated with the determined actual slice are slice-level reference signals.
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Abstract
Time, frequency and spatial processing parameters for communications between a base station and a mobile station are selected by transmitting synchronization signals in multiple slices of a wireless transmission sector for the base station, and receiving feedback from the mobile station of at least one preferred slice of the multiple slices. In response to selection of one of the slices as an active slice for communications between the base station and the mobile station, reference signals are transmitted in the selected active slice using a corresponding selected precoder and/or codebook. The mobile station estimates and feeds back channel state information (CSI) based on those reference signals, and the CSI is then employed to determine communication parameters for communications between the base station and mobile station that are specific to the mobile station.
36 Citations
50 Claims
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1. A method, comprising:
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configuring, by a base station (BS), hierarchical channel sounding, each using a different transmitter spatial processing scheme, wherein the hierarchical channel sounding comprises synchronization signals, sector-level reference signals, and slice-level reference signals; establishing, by the BS, the hierarchical channel sounding associated with the different transmitter spatial processing scheme to at least one mobile station (MS) over a massive multi-input multi-output (MIMO) channel, wherein the different transmitter spatial processing scheme is determined by a different set of multiple angle of departures, and a different set of transmitter codebooks or a different set of transmitter precoders; receiving, by the BS, a feedback signal from the at least one MS over the massive MIMO channel, wherein the feedback signal includes at least one preferred slice information associated with the slice-level reference signals that have been transmitted to the MS; determining, by the BS, an actual slice in accordance with the feedback information, long-term channel state information (CSI) received from the at least one MS, and short-term CSI received from the at least one MS, wherein the long-term CSI is determined by the synchronization signals and the sector-level reference signals, and the short-term CSI is determined by the slice-level reference signals included in the hierarchical channel sounding; and transmitting one or more reference signals associated with the determined actual slice to the at least one MS, wherein the actual slice is an active slice providing a communication between the at least one MS and the BS, and wherein the reference signals associated with the determined actual slice are slice-level reference signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 47)
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17. A base station, comprising:
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a controller configured to; configure a hierarchical channel sounding, each using a different transmitter spatial processing scheme, wherein the hierarchical channel sounding comprises synchronization signals, sector-level reference signals, and slice-level reference signals; establish the hierarchical channel sounding associated with the different transmitter spatial processing scheme to at least one mobile station (MS) over a massive multi-input multi-output (MIMO) channel, wherein the different transmitter spatial processing scheme is determined by a different set of multiple angle of departures, and a different set of transmitter codebooks or a different set of transmitter precoders; and determine an actual sector and slice in accordance with the feedback information using channel state information (CSI) received from the at least one MS, wherein the CSI is computed using reference signals included in the hierarchical channel sounding; and a transceiver is configured to; receive a feedback signal from the at least one MS over the massive MIMO channel, wherein the feedback signal includes at least one preferred sector and slice information associated with the sector-level and slice-level reference signals that have been transmitted to the MS; and transmit one or more reference signals associated with the determined actual slice to the at least one MS, wherein the actual slice is an active slice providing a communication between the at least one MS and the BS. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 48)
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33. A method, comprising:
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measuring, by a mobile station (MS) a hierarchical channel sounding associated with a different transmitter spatial processing scheme over a massive multi-input multi-output (MIMO) channel, wherein the different transmitter spatial processing scheme is determined by a different set of multiple angle of departures, and a different set of transmitter codebooks or a different set of transmitter precoders; determining long-term channel state information (CSI) using synchronization signals and sector-level reference signals and short-term CSI using a slice-level reference signals included in the hierarchical channel sounding; determining one or more preferred actual slices in the sector for communications with the at least one base station and the mobile station, wherein the one or more actual slice is an active slice providing a communication between the at least one BS and the MS; and transmitting a feedback signal to the at least one BS over the massive MIMO channel, wherein the feedback signal includes at least one or more preferred slice information associated with the slice-level reference signals that have been received from the BS; and receiving one or more reference signals associated with the determined actual slice to the at least one MS, wherein the reference signals associated with the determined actual slice are slice-level reference signals. - View Dependent Claims (34, 35, 36, 37, 38, 39, 49)
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40. A mobile station, comprising:
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a controller configured to; measure hierarchical channel sounding associated with a different transmitter spatial processing scheme over a massive multi-input multi-output (MIMO) channel, wherein the different transmitter spatial processing scheme is determined by a different set of multiple angle of departures, and a different set of transmitter codebooks or a different set of transmitter precoders; determine long-term channel state information (CSI) using synchronization signals and sector-level reference signals and short-term CSI using a slice-level reference signals included in the hierarchical channel sounding; determine one or more preferred actual slices in the sector for communications with the at least one base station and the mobile station, wherein the one or more actual slice is an active slice providing a communication between the at least one BS and the MS; a transceiver configured to; transmit a feedback signal to the at least one BS over the massive MIMO channel, wherein the feedback signal includes at least one or more preferred slice information associated with the slice-level reference signals that have been received from the BS; and receive one or more reference signals associated with the determined actual slice to the at least one MS, wherein the reference signals associated with the determined actual slice are slice-level reference signals. - View Dependent Claims (41, 42, 43, 44, 45, 46, 50)
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Specification