Receive beam indication for 5G systems
Systems and technologies described herein provide functionality for a cellular base station to dynamically indicate a reception (Rx) beam to be used by a user equipment (UE). The Rx beam can be indicated explicitly or implicitly. The UE can, for example, use the Rx beam for Physical Downlink Shared Channel (PDSCH) reception, Channel State Information Reference Signal (CSI-RS) measurements, and/or Channel State Information (CSI) calculation at the UE. Systems and technologies described herein are generally useful for systems that use multiple transmission (Tx) beams and/or that support Coordinated Multipoint (CoMP) transmission technology.
1. An apparatus of a user equipment (UE), the apparatus comprising:
memory; and
one or more processors configured to:
identify configuration information received via a higher layer for a plurality of receive (Rx) beams for the UE from a cellular base station, the configuration information including a plurality of Rx beam indices for the plurality of Rx beams;
identify a physical-layer communication received from the cellular base station indicating a selected Rx beam index;
identify a selected Rx beam from the plurality of Rx beams using the selected Rx beam index;
decode a downlink (DL) communication received from the cellular base station using the selected Rx beam; and
tune analog Rx beamforming weights during a designated tuning time interval between orthogonal-frequency-division-multiplexing (OFDM) symbols of an enhanced physical downlink control channel (ePDCCH) and OFDM symbols of a physical downlink shared channel (PDSCH).
2. The apparatus of claim 1 , wherein the DL communication is received over the physical downlink shared channel (PDSCH).
3. The apparatus of claim 1 , wherein the DL communication is a channel state information reference signal (CSI-RS).
4. The apparatus of claim 1 , wherein the OFDM symbols of the ePDCCH correspond to downlink control information (DCI).
5. The apparatus of claim 1 , wherein the OFDM symbols of the PDSCH correspond to a channel state information reference signal (CSI-RS).
6. The apparatus of claim 1 , wherein the one or more processors are further configured to perform channel state information (CSI) measurements using the selected Rx beam.
7. An apparatus of a cellular base station, the apparatus comprising:
memory; and
one or more processors configured to:
encode, via a higher-layer, configuration information for a plurality of receive (Rx) beams for transmission to a user equipment (UE), the configuration information including a plurality of Rx beam indices for the plurality of Rx beams;
identify, in the plurality of Rx beams, a selected Rx beam for the UE;
identify, in the plurality of Rx beam indices, a selected Rx beam index that is associated with the selected Rx beam;
encode a physical-layer communication for transmission to the UE indicating the selected Rx beam index;
encode a downlink (DL) communication for transmission to the UE, wherein the DL communication is to be decoded using the selected Rx beam;
and tune analog Rx beamforming weights during a designated tuning time interval between orthogonal-frequency-division-multiplexing (OFDM) symbols of an enhanced physical downlink control channel (ePDCCH) and OFDM symbols of a physical downlink shared channel (PDSCH).
8. The apparatus of claim 7 , wherein the one or more processors are configured to encode the DL communication for transmission over the physical downlink shared channel (PDSCH).
9. The apparatus of claim 7 , wherein the DL communication is a channel state information reference signal (CSI-RS).
10. The apparatus of claim 7 , wherein the OFDM symbols of the ePDCCH correspond to downlink control information (DCI).
11. The apparatus of claim 7 , wherein the OFDM symbols of the PD SCH correspond to a channel state information reference signal (CSI-RS).
12. A non-transitory computer-readable storage medium having instructions thereon which, when executed by one or more processors of a user equipment (UE), perform the following:
identifying configuration information received via a higher layer for a plurality of receive (Rx) beams for the UE from a cellular base station, the configuration information including a plurality of Rx beam indices for the plurality of Rx beams;
identifying a physical-layer communication received from the cellular base station indicating a selected Rx beam index;
identify a selected Rx beam from the plurality of Rx beams using the selected Rx beam indexing;
decoding a downlink (DL) communication received from the cellular base station using the selected Rx beam; and
tuning analog Rx beamforming weights during a designated tuning time interval between orthogonal-frequency-division-multiplexing (OFDM) symbols of an enhanced physical downlink control channel (ePDCCH) and OFDM symbols of a physical downlink shared channel (PD SCH).
13. The non-transitory computer-readable storage medium of claim 12 , wherein the DL communication is received over the physical downlink shared channel (PDSCH).
14. The non-transitory computer-readable storage medium of claim 12 , wherein the DL communication is a channel state information reference signal (CSI-RS).
15. The non-transitory computer-readable storage medium of claim 12 , wherein the OFDM symbols of the ePDCCH correspond to downlink control information (DCI).
16. The non-transitory computer-readable storage medium of claim 12 , wherein the OFDM symbols of the PD SCH correspond to a channel state information reference signal (CSI-RS).
17. The non-transitory computer-readable storage medium of claim 12 , further comprising instructions thereon which, when executed by the one or more processors of the UE, perform the following: performing channel state information (CSI) measurements using the selected Rx beam.