Radio Link Quality Monitoring Using Active TCI States

1 . A wireless device comprising:

one or more processors; and

a memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive, from a base station, one or more configuration parameters indicating a single frequency network (SFN) scheme;

receive, from the base station, a command activating at least two transmission configuration indicator (TCI) states for a control resource set (coreset);

monitor, via the coreset, downlink control channels based on the at least two active TCI states;

determine, when the one or more configuration parameters indicate the SFN scheme, a radio link quality based on the at least two active TCI states of the coreset; and

based on the radio link quality indicating a radio failure, initiate a radio resource control (RRC) re-establishment procedure.

2 . The wireless device of claim 1 , wherein the radio failure is a radio link failure of a cell.

3 . The wireless device of claim 1 , wherein initiating the RRC re-establishment procedure comprises transmitting, to the base station, an RRC re-establishment request.

4 . The wireless device of claim 1 , wherein the radio link quality is a signal noise rate (SNR).

5 . The wireless device of claim 1 , wherein the radio link quality is based on:

a first reference signal indicated by a first TCI state of the at least two TCI states; and

a second reference signal indicated by a second TCI state of the at least two TCI states.

6 . The wireless device of claim 5 , wherein the monitoring the downlink control channel transmissions based on the at least two TCI states comprises at least one demodulation reference signal (DMRS) antenna port of the downlink control channel transmissions being quasi co-located with:

the first reference signal with respect to a first quasi co-location type; and

the second reference signal with respect to a second quasi co-location type.

7 . The wireless device of claim 6 , wherein:

the first quasi co-location type is a quasi co-location type D (QCL TypeD); and

the second quasi co-location type is a QCL TypeD.

8 . The wireless device of claim 1 , wherein the memory storing instructions further cause the wireless device to determine the radio failure based on the radio link quality being lower than a threshold.

9 . The wireless device of claim 1 , wherein the one or more configuration parameters the SFN scheme for physical downlink control channel (PDCCH).

10 . The wireless device of claim 1 , wherein the determining the radio link quality is based on at least one of:

an average of a first measurement of a first reference signal and a second measurement of the second reference signal;

a maximum of the first measurement and the second measurement;

a minimum of the first measurement and the second measurement; or

a summation of the first measurement and the second measurement.

11 . The wireless device of claim 2 , wherein the RRC re-establishment procedure comprises a random-access procedure initiated based on the radio link failure of the cell.

12 . The wireless device of claim 1 , wherein the one or more configuration parameters further indicate a coreset index for the coreset.

13 . A base station comprising:

one or more processors; and

a memory storing instructions that, when executed by the one or more processors, cause the base station to:

transmit, to a wireless device, one or more configuration parameters indicating a single frequency network (SFN) scheme;

transmit, to the wireless device, a command activating at least two transmission configuration indicator (TCI) states for a control resource set (coreset);

transmit, to the wireless device via the coreset, downlink control channels based on the at least two active TCI states;

determine that a radio link quality based on the at least two active TCI states of the coreset is lower than a threshold, wherein the determining is based on:

receiving, from the wireless device, an uplink signal indicating a radio failure; and

the one or more configuration parameters indicating the SFN scheme; and

receive from the wireless device a radio resource control (RRC) re-establishment request.

14 . The base station of claim 13 , wherein the radio failure is a radio link failure of a cell.

15 . The base station of claim 13 , wherein the radio link quality is a signal noise rate (SNR).

16 . The base station of claim 13 , wherein the radio link quality is based on:

a first reference signal indicated by a first TCI state of the at least two TCI states; and

a second reference signal indicated by a second TCI state of the at least two TCI states.

17 . The base station of claim 13 , wherein the one or more configuration parameters the SFN scheme for physical downlink control channel (PDCCH).

18 . The base station of claim 13 , wherein the received uplink signal is at least one of:

a random-access preamble;

a scheduling request (SR); or

a medium-access control control element (MAC CE).

19 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to:

receive, from a base station, one or more configuration parameters indicating a single frequency network (SFN) scheme;

receive, from the base station, a command activating at least two transmission configuration indicator (TCI) states for a control resource set (coreset);

monitor, via the coreset, downlink control channels based on the at least two active TCI states;

determine, when the one or more configuration parameters indicate the SFN scheme, a radio link quality based on the at least two active TCI states of the coreset; and

based on the radio link quality indicating a radio failure, initiate a radio resource control (RRC) re-establishment procedure.

20 . The non-transitory computer-readable medium of claim 19 , wherein the initiating the RRC re-establishment procedure comprises transmitting, to the base station, an RRC re-establishment request.