CSI feedback design for new radio
It is recognized herein that as the number of transmit antennas in cellular systems (e.g., NR or 5G systems) increase, the Channel State information (CSI) feedback overhead may increase to unacceptable levels, and the current CSI feedback might not support beamforming training for NR. Embodiments described herein provide an enhanced and more efficient design for Channel State Information feedback as compared to current approaches.
1. An apparatus comprising a processor, a memory, and communication circuitry, the apparatus being connected to a network via its communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform operations comprising:
receiving, via Radio Resource Control (RRC) signaling, a Channel State Information (CSI) report configuration indicating a feedback type for a CSI reference signal, the CSI report configuration being associated with information indicating one or more antenna ports;
selecting one or more antenna ports from a plurality of antenna ports to communicate with at least one node in the network;
sending, to the at least one node, a feedback with a CSI report that indicates the selected one or more antenna ports based on the CSI report configuration;
receiving, until an antenna port is reselected, a CSI reference signal and downlink (DL) data via the selected one or more antenna ports; and
sending an antenna port re-selection request, via a Physical Uplink Control CHannel (PUCCH), to the at least one node, wherein the antenna port re-selection request comprises a first bit that indicates that the antenna port should be re-selected.
2. The apparatus of claim 1 , wherein the one or more antenna ports are associated with one or more beams.
3. The apparatus of claim 2 , wherein the plurality of beams are provided by a plurality of nodes in the network, and the apparatus further comprises computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform further operations comprising:
detecting the plurality of beams from the plurality of nodes; and
sending, to the plurality of nodes, an index associated with each node that is associated with at least one of the one or more selected beams.
4. The apparatus of claim 2 , wherein the CSI report comprises a respective index associated with a preconfigured number of beams.
5. The apparatus of claim 1 , wherein the antenna port is re-selected in accordance with a preconfigured periodicity.
6. A network node comprising a processor, a memory, and communication circuitry, the apparatus being connected to a network via its communication circuitry, the apparatus further comprising computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform operations comprising:
transmitting, via Radio Resource Control (RRC) signaling, a Channel State Information (CSI) report configuration indicating a feedback type for a CSI reference signal, the CSI report configuration being associated with information indicating one or more antenna ports;
receiving, from a user device, a feedback with a CSI report that indicates one or more antenna ports selected by the user device based on the CSI report configuration;
transmitting a CSI reference signal and downlink (DL) data so that the user device can receive the CSI reference signal and DL data via the one or more antenna ports; and
receiving an antenna port re-selection request, via a Physical Uplink Control CHannel (PUCCH), from the user device, wherein the antenna port re-selection request comprises a first bit that indicates that the antenna port should be re-selected.
7. The network node of claim 6 , wherein the one or more antenna ports are associated with one or more beams.
8. The network node of claim 7 , wherein the plurality of beams are provided by a plurality of nodes in the network, and the apparatus further comprises computer-executable instructions stored in the memory of the apparatus which, when executed by the processor of the apparatus, cause the apparatus to perform further operations comprising:
detecting the plurality of beams from the plurality of nodes; and
sending, to the plurality of nodes, an index associated with each node that is associated with at least one of the one or more selected beams.
9. The network node of claim 7 , wherein the CSI report comprises a respective index associated with a preconfigured number of beams.
10. The network node of claim 6 , wherein the antenna port is re-selected in accordance with a preconfigured periodicity.
11. A method for wireless communication comprising:
transmitting, via Radio Resource Control (RRC) signaling, a Channel State Information (CSI) report configuration indicating a feedback type for a CSI reference signal, the CSI report configuration being associated with information indicating one or more antenna ports;
receiving, from a user device, a feedback with a CSI report that indicates one or more antenna ports selected by the user device based on the CSI report configuration;
transmitting a CSI reference signal and downlink (DL) data so that the user device can receive the CSI reference signal and DL data via the one or more antenna ports; and
receiving an antenna port re-selection request, via a Physical Uplink Control CHannel (PUCCH), from the user device, wherein the antenna port re-selection request comprises a first bit that indicates that the antenna port should be re-selected.