Transmission and reception point configuration
A user equipment (UE) is configured to report information to a base station that is used to configure multi-transmission and reception point (TRP) operation. The UE receives a multi-TRP configuration from the base station, wherein the multi-TRP configuration configures the UE with a primary TRP (P-TRP) and a secondary TRP (S-TRP), receives a measurement configuration from the base station, wherein the measurement configuration configures the UE to perform measurements associated with the P-TRP and the S-TRP, performs measurements associated with the P-TRP and the S-TRP based on the measurement configuration and transmits a measurement report including the measurements to the base station.
1. A user equipment (UE), comprising:
a transceiver configured to communicate with a base station; and
a processor communicatively coupled to the transceiver and configured to perform operations comprising:
receiving a multi-transmission and reception point (TRP) configuration from the base station, wherein the multi-TRP configuration configures the UE with a primary TRP (P-TRP) and a secondary TRP (S-TRP);
receiving a measurement configuration from the base station, wherein the measurement configuration configures the UE to perform measurements associated with the P-TRP and the S-TRP;
performing measurements associated with the P-TRP and the S-TRP based on the measurement configuration, wherein the measurement configuration comprises a time difference (TD) measurement configuration, wherein the measurements comprise measurements of a TD between a same received radio frame transmitted by the P-TRP and the S-TRP, wherein, when the TD is greater than a predetermined value, the UE ceases monitoring the S-TRP and transmissions to the S-TRP; and
transmitting a measurement report including the measurements and a TD measurement report to the base station.
2. The UE of claim 1 , wherein the TD measurement report is one of (i) periodically transmitted to the base station, (ii) transmitted to the base station when a predetermined criterion is met or (iii) transmitted to the base station upon expiration of a timer.
3. The UE of claim 2 , wherein the predetermined criterion comprises one of (i) a change in the TD more than a predetermined value or (ii) addition of the S-TRP.
4. The UE of claim 1 , wherein the operations further comprise:
processing a first physical downlink shared channel (PDSCH) from the P-TRP and a second PDSCH from the S-TRP.
5. The UE of claim 1 , wherein measurement configuration includes parameterized channel state information reference signal (CSI-RS) resources, and wherein the measurement report comprises a CSI measurement report including CSI measurements based on the CSI-RS resources, and wherein configuration of the P-TRP and the S-TRP are based on the CSI measurement report.
6. The UE of claim 1 , wherein the operations further comprise:
receiving a virtual cell identifier (cell-ID) configuration from the base station for each of a plurality of sounding reference signal (SRS) resource sets, wherein each of the plurality of SRS resource sets is associated with an SRS transmission to a corresponding one of the P-TRP and the S-TRP.
7. The UE of claim 1 , wherein, when a collision between two or more uplink transmissions from the UE to different TRPs has occurred, the operations further comprise:
one of dropping or rate-matching lower priority channels of a predetermined prioritized channel hierarchy.
8. The UE of claim 1 , wherein the measurement configuration comprises a CSI measurement configuration, wherein the measurement report comprises a CSI measurement report.
9. The UE of claim 8 , wherein the CSI measurement configuration includes CSI-RS resources corresponding to one TRP, and wherein the CSI report includes a preferred TRP indicator and CSI measurements for a TRP selected by the UE as a preferred TRP.
10. The UE of claim 8 , wherein the CSI measurement configuration includes CSI-RS resources corresponding to multiple TRPs, and wherein a scheduling downlink control information (DCI) triggers CSI reporting for the multiple TRPs in the measurement report.
11. A processor of a user equipment (UE) configured to:
process a multi-transmission and reception point (TRP) configuration from a base station, wherein the multi-TRP configuration configures the UE with a primary TRP (P-TRP) and a secondary TRP (S-TRP);
process a measurement configuration from the base station, wherein the measurement configuration configures the UE to perform measurements associated with the P-TRP and the S-TRP;
perform measurements associated with the P-TRP and the S-TRP based on the measurement configuration, wherein the measurement configuration comprises a time difference (TD) measurement configuration, wherein the measurements comprise measurements of a TD between a same received radio frame transmitted by the P-TRP and the S-TRP, wherein, when the TD is greater than a predetermined value, the UE ceases monitoring the S-TRP and transmissions to the S-TRP; and
generate, for transmission to the base station, a measurement report including the measurements and a TD measurement report.
12. The processor of claim 11 , wherein the TD measurement report is transmitted to the base station upon expiration of a timer.
13. The processor of claim 11 , wherein measurement configuration includes parameterized channel state information reference signal (CSI-RS) resources, and wherein the measurement report is a CSI measurement report including CSI measurements based on the CSI-RS resources, and wherein configuration of the P-TRP and the S-TRP are based on the CSI measurement report.
14. The processor of claim 11 , wherein when a collision between two or more uplink transmissions from the UE to different TRPs has occurred, the processor is further configured to:
one of drop or rate-match lower priority channels of a predetermined prioritized channel hierarchy.
15. The processor of claim 11 , wherein the measurement configuration is a CSI measurement configuration, wherein the measurement report is a CSI measurement report.
16. The processor of claim 15 , wherein the CSI measurement configuration includes CSI-RS resources corresponding to one TRP, and wherein the CSI report includes a best TRP indicator and CSI measurements for a TRP selected by the UE as a best TRP.