Precoding a Transmission from a One-Dimensional Antenna Array that Includes Co-Polarized Antenna Elements Aligned in the Array's Only Spatial Dimension
First Claim
1. A method for precoding a transmission from a one-dimensional antenna array that includes co-polarized antenna elements aligned in the array'"'"'s only spatial dimension, the method performed by a transmitting radio node for precoding the transmission to a receiving radio node, characterized by:
- precoding the transmission from each of different subarrays of the antenna elements using a coarse-granularity precoder that is factorizabie from a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities, so as to virtualize the subarrays as different auxiliary elements; and
precoding the transmission from the different auxiliary elements using a finer granularity precoder that is also factorizable from the multi-granular precoder, wherein the multi-granular precoder comprises the Kronecker Product of the coarse-granularity precoder and the finer-granularity precoder, and wherein the coarse granularity precoder and the finer-granularity precoder are included within one or more codebooks used for said precoding.
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Accused Products
Abstract
A transmitting radio node (10) precodes a transmission from a one-dimensional antenna array (12) to a receiving radio node (50). The array (12) includes co-polarized antenna elements (14) aligned in the array'"'"'s only spatial dimension. The transmitting radio node (10) precodes the transmission from each of different subarrays (34a, 34b) of the antenna elements (14) using a coarse-granularity precoder that is factorizable from a multi-granular precoder targeting the given spatial dimension of the array (12) at different granularities, so as to virtualize the subarrays (34a, 34b) as different auxiliary elements (38a, 38b). The transmitting radio node (10) also precode the transmission from the different auxiliary elements (38a, 38b) using one or more finer-granularity precoders that are also factorizable from the multi-granular precoder. In this case, the coarse granularity precoders and the one or more finer-granularity precoders are represented within one or more codebooks (26) used for said precoding.
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Citations
28 Claims
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1. A method for precoding a transmission from a one-dimensional antenna array that includes co-polarized antenna elements aligned in the array'"'"'s only spatial dimension, the method performed by a transmitting radio node for precoding the transmission to a receiving radio node, characterized by:
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precoding the transmission from each of different subarrays of the antenna elements using a coarse-granularity precoder that is factorizabie from a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities, so as to virtualize the subarrays as different auxiliary elements; and precoding the transmission from the different auxiliary elements using a finer granularity precoder that is also factorizable from the multi-granular precoder, wherein the multi-granular precoder comprises the Kronecker Product of the coarse-granularity precoder and the finer-granularity precoder, and wherein the coarse granularity precoder and the finer-granularity precoder are included within one or more codebooks used for said precoding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 27, 28)
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11. A method for receiving a transmission from a one-dimensional antenna array that has co-polarized antenna elements aligned in the arrays only spatial dimension, wherein the antenna array is associated with a transmitting radio node, wherein the method is performed by a receiving radio node and is characterized by:
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receiving a first reference signal transmitted from the antenna array; based on measurement of the first reference signal, generating a first type of recommendation that recommends either; a multi-granular precoder in a multi-granular codebook targeting the array'"'"'s spatial dimension at different granularities, each multi-granular precoder comprising the Kronecker Product of a coarse-granularity precoder and a finer-granularity precoder;
ora coarse-granularity precoder in a coarse-granularity codebook and a finer-granularity precoder in a finer granularity codebook, the combination of which corresponds to a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities; transmitting the first type of recommendation to the transmitting radio node; receiving a second reference signal transmitted from the antenna array; based on measurement of the second reference signal, generating a second type of recommendation that recommends a finer-granularity precoder factorizable from a multi-granular precoder; transmitting the second type of recommendation to the transmitting radio node; and receiving from the antenna array a data transmission that is precoded based on the first and second types of recommendations. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for receiving a transmission from a one-dimensional antenna array that includes co-polarized antenna elements aligned in the array'"'"'s only spatial dimension, wherein the antenna array is associated with a transmitting radio node, wherein the method is performed by a receiving radio node and is characterized by:
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receiving codebook subset restriction signaling from the transmitting radio node that indicates one or more coarse-granularity precoders;
each coarse-granularity precoder factorizable along with a finer-granularity precoder from a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities, wherein a multi-granular precoder comprises the Kronecker Product of a coarse-granularity precoder and a finer-granularity precoder; andbased on said signaling, restricting precoders from which the receiving radio node selects for recommending to the transmitting radio node to a subset of precoders in a codebook that correspond to the one or more indicated coarse-granularity precoders; transmitting to the transmitting radio node a recommended precoder that is selected according to said restricting; and receiving from the antenna array a data transmission that is precoded based on the recommended precoder. - View Dependent Claims (19)
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21. A transmitting radio node configured to precode a transmission from a one-dimensional antenna array to a receiving radio node, wherein the antenna array includes co-polarized antenna elements aligned in the array'"'"'s only spatial dimension, the transmitting radio node configured to:
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precode the transmission from each of different subarrays of the antenna elements using a coarse-granularity precoder that is factorizable from a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities, so as to virtualize the subarrays as different auxiliary elements; and precode the transmission from the different auxiliary elements using a finer granularity precoder that is also factorizable from the multi-granular precoder, wherein the multi-granular precoder comprises the Kronecker Product of the coarse-granularity precoder and the finer-granularity precoder, and wherein the coarse granularity precoder and the finer-granularity precoder are included within one or more codebooks used for said precoding.
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22. (canceled)
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23. A receiving radio node configured to receive a transmission from a one-dimensional antenna array that has co-polarized antenna elements aligned in the array'"'"'s only spatial dimension, wherein the antenna array is associated with a transmitting radio node, wherein the receiving radio node is configured to:
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receive a first reference signal transmitted from the antenna array; based on measurement of the first reference signal, generate a first type of recommendation that recommends either; a multi-granular precoder in a multi-granular codebook targeting the array'"'"'s spatial dimension at different granularities, each multi-granular precoder comprising the Kronecker Product of a coarse-granularity precoder and a finer-granularity precoder;
ora coarse-granularity precoder in a coarse-granularity codebook and a finer-granularity precoder in a finer-granularity codebook, the combination of which corresponds to a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities; transmit the first type of recommendation to the transmitting radio node; receive a second reference signal transmitted from the antenna array; based on measurement of the second reference signal, generate a second type of recommendation that recommends a finer-granularity precoder factorizable from a multi-granular precoder, without also recommending a coarse-granularity precoder; transmit the second type of recommendation to the transmitting radio node; and receive from the antenna array a data transmission that is precoded based on the first and second types of recommendations.
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24. (canceled)
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25. A receiving radio node configured to receive a transmission from a one-dimensional antenna array that has co-polarized antenna elements aligned in the array'"'"'s only spatial dimension, wherein the antenna array is associated with a transmitting radio node, wherein the receiving radio node is configured to:
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receive codebook subset restriction signaling from the transmitting radio node that indicates one or more coarse-granularity precoders, each coarse-granularity precoder factorizable along with a finer-granularity precoder from a multi-granular precoder targeting the array'"'"'s spatial dimension at different granularities, wherein a multi-granular precoder comprises the Kronecker Product of a coarse-granularity precoder and a finer-granularity precoder; and based on said signaling, restrict precoders from which the receiving radio node selects for recommending to the transmitting radio node to a subset of precoders in a codebook that correspond to the one or more indicated coarse-granularity precoders; transmit to the transmitting radio node a recommended precoder that is selected according to said restricting; and receive from the antenna array a data transmission that is precoded based on recommended precoder.
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26. (canceled)
Specification