Abstract
Design of precoding and feedback for user equipment (UE)-specific reference signals (UE-RS)-based open-loop and semi-open-loop multiple input multiple output (MIMO) systems is discussed. Aspects of the present disclosure provide for sub-resource block (RB) random precoding that allows for greater diversity gain in a lower bandwidth. In addition the recoding may be performed using resource element (RE)-level layer shifting that provides for a number of precoders to be assigned to a number of layers for every such continuous subcarrier. As such two codewords may experience the same effective channel quality with channel quality indicators (CQI) being averaged across all of the layers.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | Yes | Basis Patent |
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BR112018069805A2 | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
CN108886434A | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
EP3437225A1 | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
EP3437225A4 | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
JP2019518346A | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
WO2017166287A1 | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
WO2017167092A1 | 5G | 27/05/2020 | ISLD-202005-064 | QUALCOMM INC | No | Family Member | ||||
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Claim
1. A method of wireless communication, comprising:
selecting a first precoder associated with a first transmission block, wherein the first transmission block includes one of: a first resource block, a first set of bundled resource blocks, or a first sub-resource block selected as a group of contiguous resource elements within a resource block; transmitting user equipment (UE)-specific reference signals (UE-RS) and data within the first transmission block, wherein the UE-RS and data are precoded using the first precoder; selecting a next precoder associated with a next transmission block, wherein the next transmission block includes one of: a next resource block, a next set of bundled resource blocks, or a next sub-resource block selected as a next group of contiguous resource elements within the resource block; and transmitting the UE-RS and data in the next transmission block, wherein the UE-RS and data are precoded with a next precoder.
2. The method of claim 1, wherein the first precoder and the next precoder are based on a product of a wideband precoding matrix and a subband precoding matrix, wherein the subband precoding matrix is cyclically selected from a set of predetermined precoding matrices.
3. The method of claim 2, wherein the wideband precoding matrix is one of:
received from a UE; or randomly selected from a set of predetermined wideband precoding matrices.
4. The method of claim 1, wherein the transmitting the UE-RS and data are at rank >1 and configured with spatial multiplexing, wherein the data is further precoded with a layer permutation matrix along with the first precoder and the next precoder; wherein the layer permutation matrix cyclically assigns each resulting transmission beam to a different layer within a predetermined number of continuous subcarriers.
5. The method of claim 1, wherein the transmitting the UE-RS and data are at rank 1 and configured with transmit diversity, wherein the data is further precoded with a space frequency block coding matrix.
6. The method of claim 5, further including:
determining the first transmission block is the first set of bundled resource blocks; determining presence of an even number of resource elements for the data in two continuous resource blocks of the first set of bundled resource blocks; and mapping the data precoded with the space frequency block coding matrix across two continuous resource blocks of the first set of bundled resource blocks.
7. The method of claim 1, further including:
transmitting an indication of transmission scheme, wherein the indication of transmission scheme is associated with at least one or more UE-RS ports, the number of useful layers, a mode of transmit diversity or spatial multiplexing for data transmission.
8. The method of claim 1, further including:
determining the first transmission block and the next transmission block based on at least a total number of scheduled resource blocks, wherein a sub-resource block is selected only for a small size resource allocation.
9. (canceled)
10. A method of wireless communication, comprising:
measuring a reference signal received from a base station; determining a set of wideband and subband precoders associated with a configured antenna array; transmitting a precoding matrix indicator (PMI), wherein the PMI is associated with a wideband precoding matrix selected from a set of predetermined wideband precoders; and transmitting a channel quality indicator (CQI) generated based on the measured reference signal, wherein the channel quality indicator is generated according to an assumption that precoder elements are cycled from a set of predetermined subband precoders.
11. The method of claim 10,
wherein the CQI includes a single CQI when a rank indicator is >1.
12. The method of claim 10, wherein the PMI is not reported when the a rank indicator is >4, wherein the CQI is generated according to an assumption that precoder elements are cycled from a set of predetermined wideband precoders.
13. The method of claim 10, further including transmitting a rank indicator, wherein the rank indicator corresponds to one of:
a mode of transmit diversity or spatial multiplexing for data transmission; or a number of useful layers in a transmission channel.
14. The method of claim 10, further including:
receiving from the base station configuration of a first, second, and third reporting parameters, wherein the rank indicator is transmitted according to a first periodicity, the PMI is transmitted according to a second periodicity, and the CQI is transmitted according to a third periodicity, wherein the first, second, and third periodicities are based on one or more of the first, second, and third reporting parameters.
15. (canceled)
16. An apparatus configured for wireless communication, comprising:
means for randomly selecting a first precoder associated with a first transmission block, wherein the first transmission block includes one of: a first resource block, a first set of bundled resource blocks, or a first sub-resource block selected as a group of contiguous resource elements within a resource block; means for transmitting user equipment (UE)-specific reference signals (UE-RS) and data within the first transmission block, wherein the UE-RS and data are precoded using the first precoder; means for selecting a next precoder associated with a next transmission block, wherein the next transmission block includes one of: a next resource block, a next set of bundled resource blocks, or a next sub-resource block selected as a next group of contiguous resource elements within the resource block; and means for transmitting the UE-RS and data in the next transmission block, wherein the UE-RS and data are precoded with a next precoder.
17. The apparatus of claim 16, wherein the first precoder and the next precoder are based on a product of a wideband precoding matrix and a subband precoding matrix, wherein the subband precoding matrix is cyclically selected from a set of predetermined precoding matrices.
18. The apparatus of claim 17, wherein the wideband precoding matrix is one of:
received from a UE; or randomly selected from a set of predetermined wideband precoding matrices.
19. The apparatus of claim 16, wherein the means for transmitting the UE-RS and data are performed at rank >1, wherein the data is further precoded with a layer permutation matrix along with the first precoder and the next precoder; wherein the layer permutation matrix cyclically assigns each resulting transmission beam to a different layer within a predetermined number of continuous subcarriers.
20. The apparatus of claim 16, wherein the means for transmitting the UE-RS and data are performed at rank 1 and configured with transmit diversity, wherein the data is further precoded with a space frequency block coding matrix.
21. The apparatus of claim 20, further including:
means for determining the first transmission block is the first set of bundled resource blocks; means for determining presence of an even number of resource elements for the data in two continuous resource blocks of the first set of bundled resource blocks; and means for mapping the data precoded with the space frequency block coding matrix across two continuous resource blocks of the first set of bundled resource blocks.
22. The apparatus of claim 16, further including:
means for transmitting an indication of transmission scheme, wherein the indication of transmission scheme is associated with at least one or more UE-RS ports, the number of useful layers, a mode of transmit diversity or spatial multiplexing for data transmission.
23. The apparatus of claim 16, further including:
means for determining the first transmission block and the next transmission block based on at least a total number of scheduled resource blocks, wherein a sub-resource block is selected only for a small size resource allocation.
24. (canceled)
25. An apparatus configured for wireless communication, comprising:
means for measuring a reference signal received from a base station; means for determining a set of wideband and subband precoders associated with a configured antenna array; means for transmitting a rank indicator, wherein the rank indicator corresponds to a number of useful layers in a transmission channel; means for transmitting a precoding matrix indicator (PMI), wherein the PMI is associated with a wideband precoding matrix selected from a set of predetermined wideband precoders; and means for transmitting a channel quality indicator (CQI) generated based on the measured reference signal, wherein the channel quality indicator is generated according to an assumption that precoder elements are cycled from a set of predetermined subband precoders.
26. The apparatus of claim 25,
wherein the CQI includes a single CQI when the rank indicator is >1, and wherein the CQI includes a first CQI for single port transmissions and a second CQI when transmit diversity is supported, wherein the second CQI includes a difference between the first CQI and a diversity CQI for the transmit diversity.
27. The apparatus of claim 25, wherein the PMI is not reported when the rank indicator is >4, wherein the CQI is generated according to an assumption that precoder elements are cycled from a set of predetermined wideband precoders.
28. The apparatus of claim 25, further including:
means for receiving from the base station configuration of a first, second, and third reporting parameters, wherein the rank indicator is transmitted according to a first periodicity, the PMI is transmitted according to a second periodicity, and the CQI is transmitted according to a third periodicity, wherein the first, second, and third periodicities are based on one or more of the first, second, and third reporting parameters.
29. (canceled)
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.