Method for channel state indication-reference signal configuration update and spatial indication switch
A method is provided for TCI switching related to CSI-RS measurement and reporting, spatial relation switch for SRS, PUSCH, and PUCCH. The PDSCH and PDCCH are received according to the QCLed aperiodic CSI-RS. When the AP CSI-RS is configured as the reference in the TCI of PDSCH, UE may apply the updated TCI for the PDSCH, after the corresponding aperiodic report has been received at the network. Spatial relation switch is based on the valid measurement report. The spatial relation switch delay of aperiodic SRS can be performed when UE has sent the corresponding measurement report to the network.
1. A method for CSI-RS (channel state indication-reference signal) configuration update and spatial indication switch, comprising:
receiving a CSI-RS by user equipment in a network according to a delay of CSI-RS configuration/trigger update;
receiving first data by the user equipment according to a configured TCI (transmission configuration indication) state; and
transmitting second data by the UE according to whether a known condition of an SR (spatial relation) is fulfilled and a corresponding SR (spatial relation) switch delay for the second data;
wherein the first data comprises a PDCCH (physical downlink control channel) and/or a PDSCH (physical uplink control channel), and the second data comprises an SRS (sounding reference signal), a PUSCH (physical uplink shared channel) and/or a PUCCH (physical uplink control channel).
2. The method of claim 1 , wherein the network is an NR (new radio) network.
3. The method of claim 1 , wherein the spatial indication comprises the SR (spatial relation).
4. The method of claim 1 , wherein the spatial indication comprises a TCI.
5. The method of claim 1 , wherein the CSI-RS is periodic, and the delay of CSI-RS configuration/trigger update is a sum of an RRC (radio resource control) processing time and a time of fine time tracking.
6. The method of claim 1 , wherein the CSI-RS is semi-persistent, and the delay of CSI-RS configuration/trigger update is a sum of an HARQ (hybrid automatic repeat request) feedback time, an MAC-CE (medium access control-control element) processing time, and a time of fine time tracking.
7. The method of claim 1 , wherein the CSI-RS is aperiodic, and the delay of CSI-RS configuration/trigger update is a time related to allowed slot offsets.
8. The method of claim 7 , wherein a TCI triggering delay for the aperiodic CSI-RS is based on a timing of triggering an aperiodic report.
9. The method of claim 1 , wherein the CSI-RS is aperiodic, the first data comprises a PDCCH (physical downlink control channel) and a PDSCH (physical uplink control channel) QCLed (quasi co-located) to the aperiodic CSI-RS, the UE applies an updated TCI of the aperiodic CSI-RS to the PDCCH and the PDSCH according to a corresponding aperiodic report received at the network.
10. The method of claim 1 , wherein if a spatial setting of the PUCCH is configured to be of an SSB (synchronization signal block) index or a CSI-RS index, a known condition for the SR re-uses a known condition of the TCI state.
11. The method of claim 1 , wherein if a spatial setting of the PUCCH is configured for SRS, and the SR is in a known condition, the SR is switched.
12. The method of claim 1 , wherein if the SR is switched to be in an unknown condition, the UE is allowed to transmit the PUCCH with an arbitrary spatial domain transmission filter during a beam training phase.
13. The method of claim 1 , wherein CSI (channel state information) reporting of the CSI-RS is one of CQI (channel quality indication) reporting, RI (rand indication) reporting and PMI (precoding matrix indication) reporting.
14. The method of claim 1 , wherein the SRS is aperiodic, the spatial relation switch delay of the aperiodic SRS is measured only when the UE has sent a corresponding measurement report to the network and the spatial relation of the aperiodic SRS is in a known condition.