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US 11,115,241 B2Granted
DM-RS grouping and CSI reporting for CoMP
AssigneeApple Inc.
InventorAlexei Vladimirovich Davydov
Life of this patent
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Abstract
Described herein is a channel state information (CSI) calculation method for non-coherent joint transmission by using a dependency between CSI reported for each CSI. In one embodiment, configuration of CSI reporting is such that CSI calculated for one CSI process (denoted as the reference CSI process) can be used for interference calculation for another CSI process (denoted as the dependent CSI process).
Claims20
An apparatus, comprising:
- at least one processor configured to cause a user equipment (UE) to:
- decode a radio resource control (RRC) configuration message from a base station (BS) that configures the UE with a type C quasi-co-location (QCL) configuration, wherein the type C QCL configuration specifies that demodulation reference signal (DM-RS) antenna ports used to transmit a same codeword (CW) or transport block (TB) in a physical downlink shared channel (PDSCH) are considered to be a quasi-co-located group;
- decode downlink control information (DCI) in a physical downlink control channel (PDCCH) that schedules transmission of the PDSCH, wherein the DCI is decoded to identify the DM-RS antenna ports, MIMO (multi-input multi-output) layers, and TBs of the PDSCH to be transmitted by the BS, and wherein the DCI is decoded to determine that the PDSCH to be transmitted by the BS is an initial transmission or retransmission;
- and
- demodulate the PDSCH by using DM-RSs in the PDSCH to estimate wireless channels over which the PDSCH is transmitted, wherein large scale properties of the wireless channels corresponding to DM-RSs that belong to the same quasi-co-located antenna port group are assumed to be the same.
2 more elements
A user equipment (UE), comprising:
- wireless communication circuitry;
- and
- at least one processor coupled to the wireless communication circuitry and configured to cause a user equipment (UE) to:
- decode a radio resource control (RRC) configuration message from a base station (BS) that configures the UE with a type C quasi-co-location (QCL) configuration, wherein the type C QCL configuration specifies that demodulation reference signal (DM-RS) antenna ports used to transmit a same codeword (CW) or transport block (TB) in a physical downlink shared channel (PDSCH) are considered to be a quasi-co-located group;
- decode downlink control information (DCI) in a physical downlink control channel (PDCCH) that schedules transmission of the PDSCH, wherein the DCI is decoded to identify the DM-RS antenna ports, MIMO (multi-input multi-output) layers, and TBs of the PDSCH to be transmitted by the BS, and wherein the DCI is decoded to determine that the PDSCH to be transmitted is an initial transmission or retransmission;
- and
- demodulate the PDSCH by using DM-RSs in the PDSCH to estimate wireless channels over which the PD SCH is transmitted, wherein large scale properties of the wireless channels corresponding to DM-RSs that belong to the same quasi-co-located antenna port group are assumed to be the same.
4 more elements
A method, comprising:
- by a user equipment (UE):
- decoding a radio resource control (RRC) configuration message from a base station (BS) that configures the UE with a type C quasi-co-location (QCL) configuration, wherein the type C QCL configuration specifies that demodulation reference signal (DM-RS) antenna ports used to transmit a same codeword (CW) or transport block (TB) in a physical downlink shared channel (PDSCH) are considered to be a quasi-co-located group;
- decoding downlink control information (DCI) in a physical downlink control channel (PDCCH) that schedules transmission of the PDSCH, wherein the DCI is decoded to identify the DM-RS antenna ports, MIMO (multi-input multi-output) layers, and TB s of the PDSCH to be transmitted by the BS, and wherein the DCI is decoded to determine that the PDSCH to be transmitted by the BS is an initial transmission or retransmission;
- and,
- demodulating the PDSCH by using DM-RSs in the PDSCH to estimate wireless channels over which the PD SCH is transmitted, wherein large scale properties of the wireless channels corresponding to DM-RSs that belong to the same quasi-co-located antenna port group are assumed to be the same.
2 more elements
Dependencies are inferred from the claim text.