Beam form recovery procedures using unified transmission configuration indicator states
Presented are systems, methods, apparatuses, or computer-readable media for determining time durations for applying new beams. A wireless communication device may determine a new beam for link recovery. The wireless communication device may determine a time duration for which the new beam is applicable for performing a communication.
1 . A method comprising:
determining, by a wireless communication device, a new beam for link recovery, responsive to detecting beam failure;
determining, by the wireless communication device, an ending time of a time for which the new beam is applicable for performing a communication based on a signaling indicating at least one transmission configuration indicator (TCI) state; and
monitoring, by the wireless communication device, during the time for which the new beam is applicable, a beam failure recovery physical downlink control channel (BFR-PDCCH) until reception of a downlink control information (DCI) of format 1_1 or 1_2 which indicates the TCI state after a medium access control control element (MAC CE) activating more than one TCI state or more than one codepoint of the at least one TCI state.
2 . The method of claim 1 , wherein the communication comprises at least one of:
a BRF-PDCCH, a PDCCH other than the BFR-PDCCH, a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).
3 . The method of claim 1 , wherein the communication comprises at least one of:
a downlink communication to which a TCI state is applied, where the TCI state is applicable to determine a reference signal for more than one of quasi co-location (QCL) information for a demodulation reference signal (DM-RS) of a physical downlink shared channel (PDSCH), a DM-RS of a PDCCH, or a channel state information reference signal (CSI-RS), or
an uplink communication to which a TCI state is applied, where the TCI state is applicable to determine a reference signal for determining an uplink (UL) transmission (TX) spatial filter for more than one of configured-grant based physical uplink shared channel (PUSCH), dynamic-grant PUSCH, or a sounding reference signal (SRS).
4 . The method of claim 1 , wherein the new beam is applicable for performing the communication if at least one of following conditions is met:
a source reference signal (RS) of the new beam is a synchronization signal block (SSB),
the source RS of the new beam is not included in or as a reference of a TCI state set activated via MAC CE signaling, or
the source RS of the new beam is not included in or as a reference of a TCI state set configured via radio resource control (RRC) signaling.
5 . The method of claim 1 , wherein the signaling comprises at least one of:
a MAC CE activating one TCI state or one codepoint of at least one TCI state,
a MAC CE activating more than one TCI state, or more than one codepoint of at least one TCI state, or
a DCI of format 1_1 or 1_2.
6 . The method of claim 1 , comprising:
monitoring, by the wireless communication device, the BFR-PDCCH until reception of the MAC CE activating one TCI state, or one codepoint of the at least one TCI state,
monitoring, by the wireless communication device, the BFR-PDCCH after a MAC CE activating more than one TCI state or more than one codepoint of the at least one TCI state is applicable.
7 . The method of claim 1 , comprising
determining, by the wireless communication device, a starting time of the time as X symbols after a BFR response, wherein X is an integer value.
8 . The method of claim 7 , wherein the BFR response is determined according to one of:
a PDCCH reception with a DCI format with a cyclic redundancy check (CRC) scrambled by a cell radio network temporary identifier (C-RNTI) or modulation and coding scheme C-RNTI (MCS-C-RNTI) in a search space set provided by recoverySearchSpaceId;
a PDCCH reception that determines completion of a contention based random access procedure; or
a PDCCH reception with a DCI format scheduling a physical uplink shared channel (PUSCH) transmission with a same hybrid automatic request (HARQ) process number as for transmission of a first PUSCH and having a toggled new data indicator (NDI) field value, wherein the first PUSCH carries a BFR MAC CE.
9 . The method of claim 7 , wherein X is determined according to one of:
a smallest subcarrier spacing (SCS) of a group of com-ponent carriers (CCs) to which the new beam applies, or
a smallest SCS of a group of CCs to which the new beam applies and a CC where the BFR response is received.
10 . The method of claim 1 , comprising
determining, by the wireless communication device based on the new beam, a reference signal for a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) corresponding to reception of DCI during a time period for which the new beam is applicable for performing the communication.
11 . The method of claim 10 , wherein the reference signal for the PDSCH or the PUSCH is used to determine:
a reference signal or quasi co-location (QCL) information for a demodulation reference signal (DMRS) of the PDSCH, or
a reference signal for determining an uplink (UL) trans-mission (TX) spatial filter of the PUSCH.
12 . The method of claim 1 , comprising:
transmitting, by the wireless communication device, an uplink signal with a power determined according to at least one power control parameter associated with the new beam.
13 . The method of claim 12 , wherein the uplink signal comprises at least one of: a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a physical random access channel (PRACH) or a sounding reference signal (SRS).
14 . The method of claim 12 , wherein the at least one
power control parameter comprises at least one of: an open-loop power control parameter, a pathloss reference signal (PL-RS), or a closed-loop power control parameter.
15 . The method of claim 12 , wherein the at least one power control parameter comprises a power control parameter associated with a TCI state of: a source reference signal of the new beam, or the new beam.
16 . A wireless communication device, comprising: at least one processor configured to:
determine a new beam for link recovery, responsive to detecting beam failure;
determine an ending time of a time for which the new beam is applicable for performing a communication based on a signaling indicating at least one transmission configuration indicator (TCI) state; and
monitor, during the time for which the new beam is applicable, a beam failure recovery physical downlink control channel (BFR-PDCCH) until reception of a downlink control information (DCI) of format 1_1 or 1_2 which indicates the at least one TCI state after a media access control control element (MAC CE) activating more than one TCI state or more than one codepoint of the at least one TCI state.
17 . The wireless communication device of claim 16 , wherein the communication comprises at least one of:
the BFR-PDCCH, a PDCCH other than the BFR-PDCCH, a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a channel state information reference signal (CSI-RS) or a sounding reference signal (SRS).
18 . The wireless communication device of claim 16 , wherein the communication comprises at least one of:
a downlink communication to which a TCI state is applied, where the TCI state is applicable to determine a reference signal for more than one of quasi co-location (QCL) information for a demodulation reference signal (DM-RS) of a physical downlink shared channel (PDSCH), a DM-RS of a PDCCH, or a channel state information reference signal (CSI-RS), or
an uplink communication to which a TCI state is applied, where the TCI state is applicable to determine a reference signal for determining an uplink (UL) transmission (TX) spatial filter for more than one of configured-grant based physical uplink shared channel (PUSCH), dynamic-grant PUSCH, or a sounding reference signal (SRS).
19 . The wireless communication device of claim 16 , wherein the new beam is applicable for performing the communication if at least one of following conditions is met:
a source reference signal (RS) of the new beam is a synchronization signal block (SSB),
the source RS of the new beam is not included in or as a reference of a TCI state set activated via MAC CE signaling, or
the source RS of the new beam is not included in or as a reference of a TCI state set configured via radio resource control (RRC) signaling.