Downlink signal reception in control channel repetition
A wireless device may receive an activation command comprising a set of at least two transmission configuration indicator (TCI) states for a control resource set (coreset) with a lowest coreset index in an active downlink bandwidth part of a cell. The wireless device may also receive downlink control information (DCI) scheduling a downlink signal. The wireless device may select a TCI state that occurs first in the set of the at least two activated TCI states of the coreset, based on a time offset between the DCI and the downlink signal being less than a threshold. In response, the wireless device may receive a downlink signal based on the selected TCI state.
1 . A method comprising:
receiving, by a wireless device, one or more radio resource control (RRC) messages indicating a plurality of transmission configuration indicator (TCI) states for a control resource set (coreset), wherein the coreset has a lowest coreset index in an active downlink bandwidth part of a cell;
receiving a medium access control control element (MAC CE) indicating activation of at least two TCI states of the plurality of TCI states for the coreset with the lowest coreset index, wherein the MAC CE comprises an ordered set of TCI state identifiers (IDs) of the at least two TCI states;
receiving downlink control information (DCI) scheduling a downlink signal;
based on a time offset between the DCI and the downlink signal being less than a threshold, selecting a first TCI state, among the at least two TCI states, with a TCI state ID that occurs first in the ordered set of the TCI state IDs; and
receiving the downlink signal based on the first TCI state.
2 . The method of claim 1 , wherein the downlink signal is a physical downlink shared channel (PDSCH) transmission.
3 . The method of claim 2 , wherein the receiving the downlink signal based on the first TCI state comprises at least one demodulation reference signal (DMRS) antenna port of the PDSCH transmission being quasi co-located with a reference signal indicated by the first TCI state.
4 . The method of claim 1 , wherein the downlink signal is an aperiodic channel state information reference signal (CSI-RS).
5 . The method of claim 4 , wherein the receiving the downlink signal based on the first TCI state comprises measuring a radio link quality of the aperiodic CSI-RS based on a reference signal indicated by the first TCI state.
6 . The method of claim 1 , further comprising receiving one or more messages comprising one or more configuration parameters for the cell, wherein the one or more configuration parameters indicate the threshold.
7 . The method of claim 6 , wherein the one or more configuration parameters indicate, for the coreset, the lowest coreset index among one or more coreset indexes of one or more coresets in the active downlink bandwidth part of the cell.
8 . The method of claim 7 , wherein the one or more configuration parameters indicate the one or more coreset indexes for the one or more coresets that comprise the coreset.
9 . The method of claim 7 , wherein the receiving the DCI is via a second coreset, wherein the one or more configuration parameters indicate a second coreset pool index for the second coreset.
10 . The method of claim 9 , wherein the one or more configuration parameters indicate a first coreset pool index for the coreset, wherein the first coreset pool index and the second coreset pool index are the same.
11 . The method of claim 9 , further comprising monitoring the one or more coresets in a latest time slot.
12 . The method of claim 1 , further comprising receiving one or more messages comprising one or more configuration parameters for the cell, wherein the selecting the TCI state is based on the one or more configuration parameters indicating a single frequency network (SFN) scheme for the cell.
13 . The method of claim 1 , wherein the selecting the first TCI state is further based on one or more TCI states, of the at least two TCI states, comprising quasi co-located type D information.
14 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive one or more radio resource control (RRC) messages indicating a plurality of transmission configuration indicator (TCI) states for a control resource set (coreset), wherein the coreset has a lowest coreset index in an active downlink bandwidth part of a cell;
receive a medium access control control element (MAC CE) indicating activation of at least two TCI states of the plurality of TCI states for the coreset with the lowest coreset index, wherein the MAC CE comprises an ordered set of TCI state identifiers (IDs) of the at least two TCI states;
receive downlink control information (DCI) scheduling a downlink signal;
based on a time offset between the DCI and the downlink signal being less than a threshold, select a first TCI state, among the at least two TCI states, with a TCI state ID that occurs first in the ordered set of the TCI state IDs; and
receive the downlink signal based on the first TCI state.
15 . The wireless device of claim 14 , wherein the downlink signal is a physical downlink shared channel (PDSCH) transmission.
16 . The wireless device of claim 15 , wherein receiving the downlink signal based on the first TCI state comprises at least one demodulation reference signal (DMRS) antenna port of the PDSCH transmission being quasi co-located with a reference signal indicated by the first TCI state.
17 . The wireless device of claim 14 , wherein the downlink signal is an aperiodic channel state information reference signal (CSI-RS).
18 . The wireless device of claim 17 , wherein the instructions further cause the wireless device to measure a radio link quality of the aperiodic CSI-RS based on a reference signal indicated by the first TCI state.
19 . The wireless device of claim 14 , wherein the instructions further cause the wireless device to receive one or more messages comprising one or more configuration parameters for the cell, wherein the one or more configuration parameters indicate the threshold.
20 . The wireless device of claim 14 , wherein the instructions further cause the wireless device to monitor one or more coresets in a latest time slot, the one or more coresets comprising the coreset.
21 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive one or more radio resource control (RRC) messages indicating a plurality of transmission configuration indicator (TCI) states for a control resource set (coreset), wherein the coreset has a lowest coreset index in an active downlink bandwidth part of a cell;
receive a medium access control control element (MAC CE) indicating activation of at least two TCI states of the plurality of TCI states for the coreset with the lowest coreset index, wherein the MAC CE comprises an ordered set of TCI state identifiers (IDs) of the at least two TCI states;
receive downlink control information (DCI) scheduling a downlink signal;
based on a time offset between the DCI and the downlink signal being less than a threshold, select a first TCI state, among the at least two TCI states, with a TCI state ID that occurs first in the ordered set of the TCI state IDs; and
receive the downlink signal based on the first TCI state.