Method and apparatus for low-overhead and low latency multi-beam operation
Systems, devices, and methods for low-overhead and low latency multi-beam operation in an advanced wireless communication system. A method of a user equipment (UE) for a multi-beam operation in a wireless communication system includes: receiving, from a base station (BS), a sounding reference signal (SRS) resource configuration; receiving, from the BS, a triggering message instructing the UE to transmit an SRS; receiving, from the BS, a configuration for a transmission configuration indicator (TCI) state that includes an identification (ID) indicating the SRS resource configuration; identifying a set of resources to transmit the SRS; and transmitting, to the BS over an uplink channel, the SRS based on the SRS resource configuration with a spatial domain transmission filter. The UE receives a downlink transmission from the BS with a spatial domain receive filter that is determined according to the ID included in the TCI state that is indicated for the downlink transmission.
1. A user equipment (UE) for a multi-beam operation in a wireless communication system, the UE comprising:
a transceiver configured to:
receive, from a base station (BS), a sounding reference signal (SRS) resource configuration,
receive, from the BS, a triggering message instructing the UE to transmit an SRS, and
receive, from the BS, a configuration for a transmission configuration indicator (TCI) state that includes an identification (ID) indicating the SRS resource configuration, wherein the TCI state configures a quasi co-location-Type D (QCL-Type D) for the included ID indicating the SRS resource configuration; and
a processor operably connected to the transceiver, the processor configured to identify a set of resources to transmit the SRS,
wherein the transceiver is further configured to transmit, to the BS over an uplink channel, the SRS based on the SRS resource configuration with a spatial domain transmission filter.
2. The UE of claim 1 , wherein the transceiver is further configured to:
receive, from the BS, an indicator message indicating the TCI state to be used for a downlink reception; and
receive, from the BS over a downlink channel, a downlink transmission with the indicated TCI state.
3. The UE of claim 2 , wherein the transceiver is further configured to receive, from the BS, the downlink transmission with a spatial domain receive filter, and wherein the spatial domain receive filter and the spatial domain transmission filter are a same filter.
4. The UE of claim 1 , wherein the QCL-Type D indicates information about a transmit beam used to transmit a downlink signal and is determined based on the SRS resource configuration.
5. The UE of claim 1 , wherein the transceiver is further configured to:
receive, from the BS, a physical downlink control channel (PDCCH) including first scheduling information for the SRS over the uplink channel; and
transmit, to the BS, the SRS based on the first scheduling information, the SRS used to identify a pair of beams between the UE and BS.
6. The UE of claim 1 , wherein the transceiver is further configured to receive a physical downlink control channel (PDCCH) including second scheduling information for a physical downlink shared channel (PDSCH), and wherein the PDCCH indicates the TCI state as a QCL configuration for the PDSCH.
7. A base station (BS) for a multi-beam operation in a wireless communication system, the BS comprising:
a processor; and
a transceiver operably connected to the processor, the transceiver configured to:
transmit, to a user equipment (UE), a sounding reference signal (SRS) resource configuration,
transmit, to the UE, a triggering message instructing the UE to transmit an SRS,
transmit, to the UE, a configuration for a transmission configuration indicator (TCI) state that includes an identification (ID) indicating the SRS resource configuration, wherein the TCI state configures a quasi co-location-Type D (QCL-Type D) for the included ID indicating the SRS resource configuration, and
receive, from the UE over an uplink channel, the SRS based on the SRS resource configuration in which the UE transmits with a spatial domain transmission filter,
wherein a set of resources is determined to receive the SRS from the UE.
8. The BS of claim 7 , wherein the transceiver is further configured to:
transmit, to the UE, an indicator message indicating the TCI state to be used for a downlink transmission; and
transmit, to the UE over a downlink channel, the downlink transmission with the indicated TCI state.
9. The BS of claim 8 , wherein the transceiver is further configured to transmit, to the UE, the downlink transmission in which the UE receives with a spatial domain receive filter, and wherein the spatial domain receive filter and the spatial domain transmission filter are a same filter.
10. The BS of claim 7 , wherein the QCL-Type D indicates information about a transmit beam used to transmit a downlink signal and is determined based on the SRS resource configuration.
11. The BS of claim 7 , wherein the transceiver is further configured to:
transmit, to the UE, a physical downlink control channel (PDCCH) including first scheduling information for the SRS over the uplink channel; and
receive, from the UE, the SRS based on the first scheduling information, the SRS used to identify a pair of beams between the UE and BS.
12. The BS of claim 7 , wherein the transceiver is further configured to transmit a physical downlink control channel (PDCCH) including second scheduling information for a physical downlink shared channel (PDSCH), and wherein the PDCCH indicates the TCI state as a QCL configuration for the PDSCH.
13. A method of a user equipment (UE) for a multi-beam operation in a wireless communication system, the method comprising:
receiving, from a base station (BS), a sounding reference signal (SRS) resource configuration;
receiving, from the BS, a triggering message instructing the UE to transmit an SRS;
receiving, from the BS, a configuration for a transmission configuration indicator (TCI) state that includes an identification (ID) indicating the SRS resource configuration, wherein the TCI state configures a quasi co-location-Type D (QCL-Type D) for the included ID indicating the SRS resource configuration;
identifying a set of resources to transmit the SRS; and
transmitting, to the BS over an uplink channel, the SRS based on the SRS resource configuration with a spatial domain transmission filter.
14. The method of claim 13 , further comprising:
receiving, from the BS, an indicator message indicating the TCI state to be used for a downlink reception; and
receiving, from the BS over a downlink channel, a downlink transmission with the indicated TCI state.
15. The method of claim 14 , further comprising receiving, from the BS, the downlink transmission with a spatial domain receive filter, wherein the spatial domain receive filter and the spatial domain transmission filter are a same filter.
16. The method of claim 13 , wherein the QCL-Type D indicates information about a transmit beam used to transmit a downlink signal and is determined based on the SRS resource configuration.
17. The method of claim 13 , further comprising:
receiving, from the BS, a physical downlink control channel (PDCCH) including first scheduling information for the SRS over the uplink channel;
transmitting, to the BS, the SRS based on the first scheduling information, the SRS used to identify a pair of beams between the UE and BS; and
receiving, from the BS, a PDCCH including second scheduling information for a physical downlink shared channel (PDSCH), and wherein the PDCCH indicates the TCI state as a QCL configuration for the PDSCH.