Method and apparatus for downlink data buffering considering cross carrier scheduling in a wireless communication system
Methods and apparatuses for downlink data buffering considering cross carrier scheduling in a wireless communication system. The UE receives configuration of a first serving cell and a second serving cell from a network and receives and/or monitors a first PDCCH transmitted on the second serving cell, wherein the first PDCCH schedules a first PDSCH. The UE receives and/or monitors a second PDCCH transmitted on the second serving cell, receives and/or buffers the second PDSCH based on a first TCI state used for PDCCH quasi co-location indication of a CORESET, and receives and/or buffers the first PDSCH based on a second TCI state.
1. A method of a User Equipment (UE), the method comprising:
receiving a configuration of a first serving cell and a second serving cell from a network;
receiving and/or monitoring a first Physical Downlink Control Channel (PDCCH) transmitted on the second serving cell, wherein the first PDCCH schedules a first Physical Downlink Shared Channel (PDSCH) transmitted on the first serving cell;
receiving and/or monitoring a second PDCCH transmitted on the second serving cell, wherein the second PDCCH schedules a second PDSCH transmitted on the second serving cell;
receiving and/or buffering the second PDSCH based on a first Transmission Configuration Indication (TCI) state used for PDCCH quasi co-location indication of a reference Control Resource Set (CORESET) if a time offset between reception of Downlink Control Information (DCI) of the second PDCCH and the second PDSCH is less than a threshold; and
receiving and/or buffering the first PDSCH based on a second TCI state, wherein the second TCI state comprises the lowest TCI state ID (Identity) in activated TCI states for receiving PDSCH in the first serving cell, if a time offset between reception of DCI of the first PDCCH and the first PDSCH is less than the threshold.
2. The method of claim 1 , wherein the reference CORESET is a CORESET with lowest CORESET-ID among those CORESETs monitored within the latest slot.
3. The method of claim 1 , wherein the threshold is related to UE capability or the time duration needed for the UE to successfully decode the PDCCH.
4. The method of claim 1 , further comprising:
receiving and/or buffering the second PDSCH based on the first TCI state before the UE decodes successfully the second PDCCH.
5. The method of claim 1 , further comprising:
receiving and/or buffering the first PDSCH based on the second TCI state before the UE decodes successfully the first PDCCH.
6. The method of claim 1 , wherein the first serving cell is a scheduled serving cell and the second serving cell is a scheduling serving cell.
7. A method for a network, the method comprising:
configuring a first serving cell and a second serving cell to a User Equipment (UE);
transmitting a second Physical Downlink Control Channel (PDCCH) to the UE on the second serving cell, wherein the second PDCCH schedules a second Physical Downlink Shared Channel (PDSCH) transmitted on the second serving cell;
transmitting a first PDCCH to the UE on the second serving cell, wherein the first PDCCH schedules a first PDSCH transmitted on the first serving cell;
transmitting the second PDSCH based on a first Transmission Configuration Indication (TCI) state used for PDCCH quasi co-location indication of a reference Control Resource Set (CORESET), if a time offset between reception of Downlink Control Information (DCI) of the second PDCCH and the second PDSCH is less than a threshold; and
transmitting the first PDSCH based on a second TCI state, wherein the second TCI state comprises the lowest TCI state ID (Identity) in activated TCI states for receiving PDSCH in the first serving cell, if a time offset between reception of DCI of the first PDCCH and the first PDSCH is less than the threshold.
8. The method of claim 7 , wherein the reference CORESET is a CORESET with lowest CORESET-ID among those CORESETs monitored within the latest slot.
9. The method of claim 7 , wherein the threshold is related to UE capability or the time duration needed for the UE to successfully decode the PDCCH.
10. The method of claim 7 , wherein the first serving cell is a scheduled serving cell and the second serving cell is a scheduling serving cell.
11. A network, comprising:
a processor;
a memory operatively coupled to the processor, wherein the processor is configured to execute a program code to:
configure a first serving cell and a second serving cell to a User Equipment (UE);
transmit a second Physical Downlink Control Channel (PDCCH) to the UE on the second serving cell, wherein the second PDCCH schedules a second Physical Downlink Shared Channel (PDSCH) transmitted on the second serving cell;
transmit a first PDCCH to the UE on the second serving cell, wherein the first PDCCH schedules a first PDSCH transmitted on the first serving cell;
transmit the second PDSCH based on a first Transmission Configuration Indication (TCI) state used for PDCCH quasi co-location indication of a reference Control Resource Set (CORESET), if a time offset between reception of Downlink Control Information (DCI) of the second PDCCH and the second PDSCH is less than a threshold; and
transmit the first PDSCH based on a second TCI state, wherein the second TCI state comprises the lowest TCI state ID (Identity) in activated TCI states for receiving PDSCH in the first serving cell, if a time offset between reception of DCI of the first PDCCH and the first PDSCH is less than the threshold.
12. The network of claim 11 , wherein the reference CORESET is a CORESET with lowest CORESET-ID among those CORESETs monitored within the latest slot.
13. The network of claim 11 , wherein the threshold is related to UE capability or the time duration needed for the UE to successfully decode the PDCCH.
14. The network of claim 11 , wherein the first serving cell is a scheduled serving cell and the second serving cell is a scheduling serving cell.