Wireless communications for scheduling transmissions
A wireless device may receive one or more repetitions of a downlink transmission. The wireless device may use one or more default receiving beams for receiving transmission. A quantity of default receiving beams to be used by the wireless device may be indicated by a base station.
1. A method comprising:
receiving, by a wireless device, a radio resource control (RRC) message comprising an indication indicating that the wireless device use at least two default transmission configuration indicator (TCI) states for a physical downlink shared channel (PDSCH);
receiving downlink control information (DCI) for scheduled reception via the PDSCH; and
receiving a PDSCH transmission using two default TCI states, wherein using the two default TCI states is based on:
the indication being present in the RRC message,
at least one TCI codepoint, of one or more TCI codepoints, indicating at least two TCI states, and
an offset between the receiving the DCI and the scheduled reception via the PDSCH being less than a threshold.
2. The method of claim 1 , wherein:
the receiving the PDSCH transmission comprises receiving repetitions of a transport block in a plurality of transmission occasions.
3. The method of claim 1 , further comprising:
receiving a second RRC message comprising a second indication that the wireless device use a single default TCI state for the PDSCH;
receiving second DCI for second scheduled reception via the PDSCH; and
based on the second indication indicating that the wireless device use a single default TCI state and based on an offset between the receiving the second DCI and the second scheduled reception via the PDSCH being less than a threshold, receiving a second PDSCH transmission using one default TCI state.
4. The method of claim 1 , wherein the receiving the PDSCH transmission using the two default TCI states comprises:
at least one first demodulation reference signal (DM-RS) port of the PDSCH transmission being quasi co-located with a first reference signal indicated by a first default TCI state of the two default TCI states; and
at least one second DM-RS port of the PDSCH transmission being quasi co-located with a second reference signal indicated by a second default TCI state of the two default TCI states.
5. The method of claim 1 , wherein the threshold comprises a time duration for decoding the DCI.
6. The method of claim 1 , wherein the offset comprises a time offset between the receiving the DCI and the receiving the PDSCH transmission.
7. A method comprising:
receiving, by a wireless device, a radio resource control (RRC) message comprising an indication indicating application of at least two default transmission configuration indicator (TCI) states for a physical downlink shared channel (PDSCH);
receiving an activation command indicating one or more transmission configuration indicator (TCI) codepoints;
receiving downlink control information (DCI) for a PDSCH repetition in a plurality of transmission occasions, wherein the plurality of transmission occasions comprises a first transmission occasion; and
receiving the PDSCH repetition using two default TCI states, wherein using the two default TCI states is based on:
the indication being present in the RRC message;
at least one TCI codepoint, of the one or more TCI codepoints, indicating at least two TCI states; and
an offset, between the first transmission occasion and the receiving the DCI, being less than a threshold.
8. The method of claim 7 , further comprising receiving one or more configuration parameters indicating a plurality of TCI states, wherein the receiving the activation command indicating the one or more TCI codepoints comprises receiving the activation command indicating one or more TCI states of the plurality of TCI states, and wherein the method further comprises mapping the one or more TCI states to the one or more TCI codepoints.
9. The method of claim 7 , wherein the two default TCI states are indicated by a TCI codepoint associated with a lowest TCI codepoint indicator among TCI codepoint indicators of a set of TCI codepoints, wherein each TCI codepoint in the set of TCI codepoints indicates at least two respective TCI states.
10. The method of claim 7 , wherein the receiving the PDSCH repetition using the two default TCI states comprises receiving the PDSCH repetition using:
a first default TCI state in one or more first transmission occasions of the plurality of transmission occasions, wherein the one or more first transmission occasions comprises the first transmission occasion; and
a second default TCI state in one or more second transmission occasions of the plurality of transmission occasions, wherein each of the one or more first transmission occasions is different from each of the one or more second transmission occasions.
11. The method of claim 7 , wherein the threshold comprises a time duration for decoding the DCI.
12. The method of claim 7 , wherein the offset comprises a time offset between the receiving the DCI and the receiving the PDSCH repetition.
13. A method comprising:
receiving, by a wireless device, downlink control information (DCI) for a downlink transmission in a plurality of transmission occasions, wherein the plurality of transmission occasions comprises a first transmission occasion;
determining two default transmission configuration indicator (TCI) states based on:
an offset, between the first transmission occasion and the receiving the DCI, being less than a threshold;
an indication indicating application of at least two default TCI states being present in a radio resource control (RRC) message; and
at least one TCI codepoint indicating two TCI states; and
receiving, based on a first default TCI state of the two default TCI states, a first plurality of physical downlink shared channel (PDSCH) repetitions in a first group of transmission occasions of the plurality of transmission occasions; and
receiving, based on a second default TCI state of the two default TCI states, a second plurality of PDSCH repetitions in a second group of transmission occasions, of the plurality of transmission occasions, following the first group of transmission occasions.
14. The method of claim 13 , further comprising receiving the RRC message comprising the indication indicating application of at least two default TCI states for the downlink transmission.
15. The method of claim 13 , further comprising receiving one or more configuration parameters indicating a sequential TCI mapping, wherein the receiving the first plurality of PDSCH repetitions in the first group of transmission occasions and the second plurality of PDSCH repetitions in the second group of transmission occasions is based on the one or more configuration parameters indicating the sequential TCI mapping.
16. The method of claim 13 , wherein the threshold comprises a time duration for decoding the DCI.
17. The method of claim 13 , wherein the plurality of transmission occasions starts with the first transmission occasion.
18. The method of claim 13 , further comprising:
receiving one or more messages comprising one or more configuration parameters indicating a plurality of TCI states;
receiving an activation command activating one or more TCI states of the plurality of TCI states; and
mapping the one or more TCI states to one or more TCI codepoints, wherein the one or more TCI codepoints comprise the at least one TCI codepoint.
19. The method of claim 7 , wherein the first transmission occasion is an earliest transmission occasion of the plurality of transmission occasions.
20. The method of claim 13 , wherein each transmission occasion in the first group of transmission occasions or the second group of transmission occasions comprises a plurality of symbols.