METHOD AND APPARATUS FOR CSI FEEDBACK FOR JOINT PROCESSING SCHEMES IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING COMMUNICATION SYSTEM WITH COORDINATED MULTI-POINT TRANSMISSION
First Claim
1. A method in a wireless communication terminal communicating with a base unit comprising:
- receiving indication of two or more Channel State Information (CSI) reference signal configurations, each CSI reference signal configuration representing one or more antenna ports;
determining a first set of transmission parameters corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of transmission parameters corresponding to a second set of antenna ports corresponding to a second CSI reference signal configuration;
the first set and second set of transmission parameters determined to maximize the sum data rate assuming simultaneous transmission from the first set and the second set of antenna ports; and
conveying, to the base station, information pertaining to the first set of transmission parameters and the second set of transmission parameters.
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0 Petitions
Accused Products
Abstract
Methods in a wireless terminal are described for supporting co-ordinated multipoint transmissions including joint transmissions from two or more transmission points, specifically the method of receiving indication of two or more CSI reference signal configurations, each CSI reference signal configuration representing one or more antenna ports comprising a set of antenna ports; determining a first set of transmission parameters corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of transmission parameters corresponding to a second set of antenna ports corresponding to a second CSI reference signal configuration; the first set and second set of transmission parameters determined to maximize the sum data rate for simultaneous transmission from the first set and the second set of antenna ports; conveying, to the base station, information pertaining to the first set of transmission parameters and the second set of transmission parameters.
86 Citations
32 Claims
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1. A method in a wireless communication terminal communicating with a base unit comprising:
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receiving indication of two or more Channel State Information (CSI) reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; determining a first set of transmission parameters corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of transmission parameters corresponding to a second set of antenna ports corresponding to a second CSI reference signal configuration; the first set and second set of transmission parameters determined to maximize the sum data rate assuming simultaneous transmission from the first set and the second set of antenna ports; and conveying, to the base station, information pertaining to the first set of transmission parameters and the second set of transmission parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method in a wireless terminal comprising:
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receiving indication of two or more CSI reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; determining a first set of transmission parameters corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration, where first set of transmission parameters includes a first transmission rank; determining a second set of transmission parameters corresponding to a second set of antenna ports corresponding to a second CSI reference signal configuration, where second set of transmission parameters includes a second transmission rank; deriving a third transmission rank from the first and second transmission ranks; and determining a third set of transmission parameters corresponding to a joint transmission from the first and second set of antenna ports, assuming the third transmission rank. conveying, to the base station, information pertaining to one or more of the first set of transmission parameters, the second set of transmission parameters and the third set of transmission parameters.
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11. A method in a wireless communication device comprising:
receiving indication of two or more CSI reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; determining transmission parameters based on transmission from a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of antenna ports corresponding to a second CSI reference signal configuration; wherein the transmission parameters including a codebook which indicates the transmission weight vectors from the first set and the second set of antenna ports; wherein the codebook includes a first set of one or more diagonal entries corresponding to transmission of a first set of spatial layers from first set of antenna ports and a second set of spatial layers from the second set of antenna ports; and wherein the codebook includes a second set of entries for transmission of the one or more spatial layers from the first set of antenna ports and for the second set of antenna ports are not transmitting or transmitting based on a fixed hypothesis for transmission; and conveying back the preferred codebook index to the basestation - View Dependent Claims (12, 13, 14)
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15. A method in a wireless terminal comprising:
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receiving indication of two or more CSI reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; selecting a first set of subbands corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of subbands corresponding to a to a second set of antenna ports corresponding to a second CSI reference signal configuration; determining a first set of transmission parameters corresponding to the first set of antenna ports on the first set of subbands and a second set of transmission parameters corresponding to the second set of antenna ports on the second set of subbands conveying, to the base station, information pertaining to the first set of transmission parameters and the second set of transmission parameters and the first set and the second set of subbands - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method in a wireless base station, the method comprising:
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sending indication of two or more CSI reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; receiving information pertaining to the first set of transmission parameters corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of transmission parameters corresponding to a second set of antenna ports corresponding to a second CSI reference signal configuration; the first set and second set of transmission parameters determined assuming a simultaneous first single codeword transmission from the first set of antenna ports on a first downlink time frequency resource and a second single codeword transmission from the second set of antenna ports on a second downlink time frequency resource where the first and second time frequency resources overlap. - View Dependent Claims (22)
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23. A method in a wireless base station, the method comprising:
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sending an indication of two or more CSI reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; receiving information pertaining to transmission parameters corresponding to a transmission from a first set of antenna ports corresponding to a first CSI reference signal configuration and a second set of antenna ports corresponding to a second CSI reference signal configuration; wherein the transmission parameters including a codebook which indicates the transmission weight vectors from the first set and second set of antenna ports; wherein the codebook includes a first set of one or more diagonal entries corresponding to transmission of a first set of spatial layers from the first set of antenna ports and a second set of spatial layers from the second set of antenna ports; and the codebook includes a second set of entries assuming transmission of one or more spatial layers from the first set of antenna ports and assuming no transmission on the second set of antenna ports or assuming transmission on the second set of antenna ports based on a fixed hypothesis for transmission; - View Dependent Claims (24)
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25. A method in a wireless terminal comprising:
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receiving indication of two or more Channel State Information (CSI) reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; determining a first set of transmission parameters corresponding to a first set of antenna ports corresponding to a first CSI reference signal configuration, where first set of transmission parameters includes a first transmission rank; determining a second set of transmission parameters corresponding to a second set of antenna ports corresponding to a second CSI reference signal configuration, where second set of transmission parameters includes a second transmission rank, the second transmission rank based on the determined first transmission rank; conveying, to the base station, information pertaining to one or more of the first set of transmission parameters, and the second set of transmission parameters. - View Dependent Claims (26, 27)
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28. A method in a wireless communication device comprising:
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receiving indication of two or more Channel State Information (CSI) reference signal configurations, each CSI reference signal configuration representing one or more antenna ports; receiving an indication for a first subset of codebook entries from a first codebook based on a first codebook-subset-restriction value, the first subset of codebook entries indicates possible transmission weight vectors corresponding to a first set of antenna ports corresponding to the first CSI reference signal configuration; receiving an indication for a second subset of codebook entries from a second codebook based on a second codebook-subset-restriction value, the second subset of codebook entries indicates possible transmission weight vectors corresponding to a second set of antenna ports corresponding to the second CSI reference signal configuration; determining a first set of transmission parameters corresponding to the first set of antenna ports corresponding to the first CSI reference signal configuration, where first set of transmission parameters includes a first precoding matrix index, the first precoding matrix index selected from the first subset of codebook entries; determining a second set of transmission parameters corresponding to the second set of antenna ports corresponding to the second CSI reference signal configuration, where second set of transmission parameters includes a second precoding matrix index, the second precoding matrix index selected from the second subset of codebook entries; conveying, to the base station, information pertaining to one or more of the first set of transmission parameters, and the second set of transmission parameters. - View Dependent Claims (29, 30, 31, 32)
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Specification