Transmitter, Receiver and Methods for Downlink Control Signalling
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Abstract
Downlink control information (DCI) extensions to support 3GPP Rel-10 functionalities comprise minimal extensions of DCI format 2B. In some embodiments, only two extra bits (20) are introduced to signal rank up to eight, by reusing the Scrambling Identity bit (16) while at the same time supporting different MU-MIMO dimensioning for the important cases of rank-1 and rank-2. This new DCI format can potentially support not only single cell downlink transmission but also some other Rel-10 functionalities, e.g. CoMP or relaying/HetNet.
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Citations
56 Claims
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1-28. -28. (canceled)
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29. A method in a transmitter for indicating to a receiver a transmission rank value used in a downlink transmission from the transmitter, the method comprising:
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jointly encoding two additional bits with a 1-bit Scrambling Identity (SI) bit to implicitly indicate a transmission rank value in the range of 3 to 8; and transmitting a message in a downlink control information (DCI) format, wherein the DCI format comprises a 1-bit New Data Indicator (NDI), the 1-bit SI and disabled or enabled Transport Blocks (TBs) and the two additional bits that are jointly encoded with the 1-bit SI to implicitly indicate the transmission rank values of 3-8. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method in a receiver for enabling the receiver to determine a transmission rank value used in downlink transmission, the method comprising:
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receiving a message in a downlink control information (DCI) format, the message comprising a 1-bit New Data Indicator (NDI), a 1-bit Scrambling Identity (SI), disabled or enabled Transport Blocks (TBs), and two bits that are jointly encoded with the 1-bit SI to implicitly indicate the transmission rank values of 3-8; and configuring the receiver to receive data according to the DCI format and the indicated transmission rank value.
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43. A transmitter operative to indicate to a receiver a transmission rank value used in a downlink transmission from the transmitter, comprising:
a processing circuit operative to direct a transmitting circuit to transmit a message in a downlink control information (DCI) format, wherein the DCI format comprises a 1-bit New Data Indicator (NDI), a 1-bit Scrambling Identity (SI), and disabled or enabled Transport Blocks (TBs), which DCI format comprises two additional bits, and the 1-bit SI and the two additional bits are jointly encoded to implicitly indicate the transmission rank values of 3-8. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A receiver operative to determine a transmission rank value used in a downlink transmission, the receiver comprising:
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a receiving circuit operative to receive a message in a downlink control information (DCI) format that comprises a 1-bit new data indicator (NDI), a 1-bit Scrambling Identity (SI), disabled or enabled Transport Blocks (TBs), and two additional bits that are jointly encoded with the 1-bit SI to implicitly indicate a transmission rank value in the range of 3-8; and a processing circuit operative to configure the receiver to receive data according to the DCI format and the indicated transmission rank value.
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Specification