Beam Failure Detection Resource Set for Physical Downlink Control Channel (PDCCH) with Repetition

Abstract

The present disclosure provides systems, methods, and apparatuses for using beam failure detection reference signal resource sets in a system with repeated physical downlink control channels (PDCCHs), including computer programs encoded on computer storage media. In one aspect, a user equipment (UE) may monitor physical downlink control channel (PDCCH) transmissions using at least two transmission control indicator (TCI) states. The UE may determine a beam failure detection reference signal resource set associated with PDCCH monitoring at least in part based on characteristics of one or more of the TCI states or at least in part based on a list of reference signal pairs configured for one of the at least two TCI states. The UE may monitor a first beam failure detection reference signal resource set associated with PDCCH monitoring to identify a beam failure.

Description

Technical Field

[0001] This description relates to wireless communication, including using beam failure detection reference signal (RS) resource sets for physical downlink control channel (PDCCH) repetition. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multi-access systems include fourth-generation (4G) systems such as Long-Term Evolution (LTE) systems, enhanced LTE (LTE-A) systems, or LTE-A Pro systems, and fifth-generation (5G) systems that may be referred to as New Radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multi-access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices, which may sometimes also be referred to as user equipment (UE). Summary of the Invention

[0003] The systems, methods, and devices of the present disclosure each have several innovative aspects, none of which alone is responsible for the desired attributes disclosed herein.

[0004] One innovative aspect of the subject matter described in the present disclosure may be implemented in a method of wireless communication at a device for a user equipment (UE). The method may include: monitoring PDCCH transmissions using at least two transmission control indicator (TCI) states; identifying characteristics of one or more of the at least two TCI states; based on the characteristics of the one or more of the at least two TCI states, using the one or more of the at least two TCI states to determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring; and monitoring the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify beam failure.

[0005] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at a UE. The apparatus may include a processing system. The processing system may be configured to: monitor PDCCH transmissions using at least two TCI states; identify characteristics of one or more of the at least two TCI states; determine, based on the characteristics of the one or more of the at least two TCI states, a first beam failure detection reference signal resource set associated with the PDCCH monitoring using the one or more of the at least two TCI states; and monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0006] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at a UE. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: monitor PDCCH transmissions using at least two TCI states; identify characteristics of one or more of the at least two TCI states; determine, based on the characteristics of the one or more of the at least two TCI states, a first beam failure detection reference signal resource set associated with the PDCCH monitoring using the one or more of the at least two TCI states; and monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0007] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at a UE. The apparatus may include units for: monitoring PDCCH transmissions using at least two TCI states; identifying characteristics of one or more of the at least two TCI states; determining, based on the characteristics of the one or more of the at least two TCI states, a first beam failure detection reference signal resource set associated with the PDCCH monitoring using the one or more of the at least two TCI states; and monitoring the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0008] Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication at a device for a UE. The code can include instructions executable by a processor to perform the following operations: monitoring PDCCH transmissions using at least two TCI states; identifying characteristics of one or more of the at least two TCI states; determining, based on the characteristics of the one or more of the at least two TCI states, a first beam failure detection reference signal resource set associated with the PDCCH monitoring using the one or more of the at least two TCI states; and monitoring the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0009] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, the characteristics of the one or more of the at least two TCI states can be the order of the at least two TCI states, and wherein determining the first beam failure detection reference signal resource set can further include operations, features, units, or instructions for performing the following operations: setting the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index having the same value as a reference signal index value in a reference signal set indicated as a first TCI state by the order of the at least two TCI states.

[0010] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, the characteristics of the one or more of the at least two TCI states can be an identifier, and wherein determining the first beam failure detection reference signal resource set can further include operations, features, units, or instructions for performing the following operations: selecting a first TCI state of the at least two TCI states based on the identifier; and setting the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as a reference signal index value in a reference signal set indicated by the first TCI state.

[0011] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, the identifier includes one of a TCI state identifier, a control resource set (CORESET) identifier, or a search space identifier.

[0012] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, operations, features, units, or instructions for performing the following may also be included: selecting the first TCI state may be based on the smallest identifier of the at least two TCI states.

[0013] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, operations, features, units, or instructions for performing the following may also be included: determining a second beam failure detection reference signal resource set associated with the PDCCH monitoring.

[0014] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, determining the first beam failure detection reference signal resource set may also include operations, features, units, or instructions for performing the following: setting the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in a first reference signal set indicated by a first TCI state among the at least two TCI states, and determining the second beam failure detection reference signal resource set may also include operations, features, units, or instructions for performing the following: setting the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in a second reference signal set indicated by a second TCI state among the at least two TCI states.

[0015] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, determining the first beam failure detection reference signal resource set may also include operations, features, units, or instructions for performing the following: setting the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in a first reference signal set indicated by a TCI state among the at least two TCI states, the TCI state being associated with a smaller transmit / receive point (TRP) identifier, a smaller TCI state identifier, a smaller CORESET identifier, or a smaller search space identifier, and determining the second beam failure detection reference signal resource set may also include operations, features, units, or instructions for performing the following: setting the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in a second reference signal set indicated by a second TCI state among the at least two TCI states.

[0016] Some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: detecting a radio link failure based on monitoring at least the first beam failure detection reference signal resource set; and sending an indication of the radio link failure to the base station or a first interface, the first interface being configured to output the indication of the radio link failure for transmission to the base station.

[0017] In some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein, monitoring the PDCCH transmission may also include operations, features, units, or instructions for: monitoring at least one CORESET associated with the at least two TCI states; monitoring a search space set associated with at least two CORESETs; or monitoring two search space sets associated with two CORESETs each having an active TCI state.

[0018] One innovative aspect of the subject matter described in this disclosure may be implemented in a method for wireless communication at a device for a UE. The method may include: monitoring PDCCH transmission using at least two TCI states; determining a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs configured based on one of the at least two TCI states; and monitoring at least the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0019] Another innovative aspect of the subject matter described in this disclosure may be implemented in a device for wireless communication at a UE. The device may include a processing system configured to: monitor PDCCH transmission using at least two TCI states; determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs configured based on one of the at least two TCI states; and monitor at least the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0020] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication at a UE. The apparatus can include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the apparatus to perform the following operations: monitor PDCCH transmissions using at least two TCI states; determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs configured based on one of the at least two TCI states; and at least monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0021] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication at a UE. The apparatus can include units for performing the following operations: monitor PDCCH transmissions using at least two TCI states; determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs configured based on one of the at least two TCI states; and at least monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0022] Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication at an apparatus for a UE. The code can include instructions executable by a processor to perform the following operations: monitor PDCCH transmissions using at least two TCI states; determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs configured based on one of the at least two TCI states; and at least monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0023] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein can further include operations, features, units, or instructions for performing the following operations: determining that the first beam failure detection reference signal resource set includes the list of reference signal pairs can also be based on the at least two TCI states.

[0024] One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication at a device for a UE. The method can include: monitoring PDCCH transmissions using at least two TCI states; monitoring the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations; at least monitoring the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and determining that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

[0025] Another innovative aspect of the subject matter described in this disclosure can be implemented in a device for wireless communication at a UE. The device can include a processing system configured to: monitor PDCCH transmissions using at least two TCI states; monitor the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations; at least monitor the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and determine that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

[0026] Another innovative aspect of the subject matter described in this disclosure can be implemented in a device for wireless communication at a UE. The device can include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the device to perform the following operations: monitor PDCCH transmissions using at least two TCI states; monitor the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations; at least monitor the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and determine that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

[0027] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication at a UE. The apparatus may include units for performing the following operations: monitoring PDCCH transmissions using at least two TCI states; monitoring the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, wherein the beam failure detection reference signal resource set defines two or more resource pair configurations; at least monitoring the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and determining that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

[0028] Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication at a UE device. The code may include instructions executable by a processor to perform the following operations: monitoring PDCCH transmissions using at least two TCI states; monitoring the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, wherein the beam failure detection reference signal resource set defines two or more resource pair configurations; at least monitoring the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and determining that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

[0029] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operation: providing an indication of the radio link failure to a higher layer of the UE.

[0030] Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 and 2 show examples of wireless communication systems that support using a beam failure detection resource set (RS) for physical downlink control channel (PDCCH) repetition.

[0032] Figure 3 show examples of process flows that support using a beam failure detection RS resource set for PDCCH repetition.

[0033] Figure 4 A schematic diagram of a system including a device that supports using a beam failure detection RS resource set for PDCCH repetition is shown.

[0034] Figures 5 to 7 A flowchart illustrating an example method that supports using a beam failure detection RS resource set for PDCCH repetition is shown.

[0035] Like reference numerals and designations in the various drawings indicate like elements. Detailed Description

[0036] To describe the innovative aspects of the present disclosure, the following description is directed to certain implementations. However, those of ordinary skill in the art will readily recognize that the teachings herein can be applied in many different ways. The described implementations can be implemented in any device, system, or network capable of transmitting and receiving RF signals according to any IEEE 16.11 standard, or IEEE 802.11 standard, standard, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Global System for Mobile Communications (GSM), GSM / General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Terrestrial Trunked Radio (TETRA), Wideband CDMA (W-CDMA), Evolution-Data Optimized (EV-DO), 1xEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed Packet Access (HSPA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Evolution High Speed Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or any one of other known signals for communication within a wireless, cellular, or Internet of Things (IoT) network (e.g., a system utilizing 3G, 4G, or 5G technology or further implementations thereof).

[0037] In some wireless communication systems, a user equipment (UE) may support beamforming or communicate with a base station (BS), a network entity, or another device using multiple beams. The UE may support beam indication, which may imply that some physical downlink control channel (PDCCH) transmissions may use the same transmission beam as a configured reference signal (RS) (e.g., a channel state information reference signal (CSI-RS) or a synchronization signal (SS) block (SSB)). The beam indication may be based on the configuration of transmission configuration indication (TCI) states and downlink signaling. The TCI state may include information about the CSI-RS or SSB, etc. By associating the downlink transmission on the PDCCH with a specific TCI, the base station can notify the UE that the UE may assume that the PDCCH transmission is sent using the same spatial filter as the reference signal associated with the TCI state. However, sometimes beam failure may occur, and beam reestablishment may be required.

[0038] The UE may monitor the PDCCH for beam failure. When the error probability for the PDCCH exceeds a threshold value, or based on measurements of the reference signal transmitted on the PDCCH, the UE may detect the occurrence of beam failure. For example, the UE may assume that beam failure has occurred based on measurements of the periodic CSI-RS associated with the PDCCH TCI state. To detect beam failure based on measurements of the reference signal, the UE may be configured with one or more index sets that can be used to detect beam failure.

[0039] A base station (such as a gNB) may configure the UE with configuration indices that can be used to detect beam failure and determine a candidate beam set for beam recovery. For example, for each bandwidth part (BWP) of a serving cell, the base station may provide the UE with a beam failure detection resource set q0 of periodic CSI-RS resource configuration indices and a new beam candidate resource set q1 of periodic CSI-CRS resource configuration indices or synchronization signal / physical broadcast channel (PBCH) block indices. The UE may use the set q0 to perform radio link quality measurements for the BWP of the serving cell and, when the radio link quality is poor, use the set q1 to find new candidate beams. However, in some implementations, the base station may not configure q0 for signaling overhead reduction or may not configure q0 during a transition period when the configuration signal for q0 is unavailable. In these implementations, the UE may determine the q0 set itself.

[0040] When monitoring the PDCCH using a single TCI state, the UE can directly determine the beam failure detection resource set q0. For example, in 3GPP New Radio (NR) Release 15, the PDCCH is monitored in a Control Resource Set (CORESET), and a single active TCI state can be used to activate the CORESET. However, in NR Release 17, the PDCCH can be configured to be monitored using two TCI states. A PDCCH transmission or PDCCH candidate to be monitored using two TCI states can be associated with an optional number of CORESETs and Search Space (SS) sets. For example, a PDCCH transmission or PDCCH candidate can be monitored in a single CORESET, which can be configured with two active TCI states. Alternatively, a PDCCH transmission or PDCCH candidate can be monitored in one SS set associated with two different CORESETs, and each CORESET can be configured with an active TCI state. Another alternative is that a PDCCH transmission or PDCCH candidate can be monitored in two SS sets, and the two SS sets can be associated with two CORESETs, where each CORESET is configured with an active TCI state. The techniques described herein enable the UE to determine the beam failure detection resource set q0 when there can be a PDCCH transmission associated with two TCI states. In some examples, the techniques apply when the TCI state provides a Quasi-Co-Location (QCL) type D reference signal that defines spatial reception parameters.

[0041] In some implementations, for example, in a case where the base station does not configure the UE with the beam failure detection resource set q0 and monitors at least one PDCCH in the PDCCH using two TCI states, the UE can determine the beam failure detection resource set q0. The UE can determine the beam failure detection resource set q0 to include a periodic CSI-RS resource configuration index that has the same value as the reference signal (RS) index in the RS resource set indicated by one of the TCI states used by the UE to monitor the PDCCH. Alternatively, the UE can use the indices from the two TCI states to determine the set of q0. If only one TCI state is used, the UE can use the characteristics of the TCI state to determine which TCI state to use.

[0042] In some implementations, the UE can determine two beam failure detection resource sets q0. The two sets can include periodic CSI-RS resource configuration indices that have the same value as the RS indices in the RS resource sets indicated by the two TCI states. The UE can use the characteristics of the TCI states to decide which TCI state to use for which beam failure detection resource set q0.

[0043] In some implementations, the beam failure detection resource set q0 can be configured. In some examples, the base station can configure the beam failure detection resource set q0 and notify the UE of this configuration. In some examples, the beam failure detection resource set q0 can be configured as a list of RS pairs, where each RS pair can be configured with one or two TCI states. Alternatively, the UE can determine that the beam failure detection resource set q0 can be configured as a list of RS pairs.

[0044] The techniques described herein also provide for the UE to determine when a radio link failure has occurred. In some implementations, the UE may not indicate a beam failure unless it detects a beam failure associated with two TCI states. For example, in some implementations, when the radio link quality configured for all corresponding resource pairs in the q0 set used by the UE to evaluate the radio link quality is worse than a threshold, the physical layer (PHY) in the UE provides an indication to a higher layer. The radio link quality can be indicated for all corresponding resource pairs. Since there are at least two TCI states for PDCCH monitoring, there can be at least RS resource set pairs jointly used to evaluate the radio link quality. In the beam failure detection resource set q0, the UE can use the RS pairs associated with the two TCI states used for the same PDCCH monitoring to evaluate the link quality. In one example, before the UE sends a beam failure indication, the radio link quality of the two RSs can meet the threshold. In another example, before the UE sends a beam failure indication, the radio link quality when jointly evaluated using the two RSs can meet the threshold.

[0045] Specific implementations of the subject matter described in this disclosure can be realized to achieve one or more of the following potential advantages. For example, the techniques described can lead to improved efficiency and communication, as well as improved configuration for communications using multiple TCI states. The techniques described can also improve beam failure detection. This can result in faster, more robust, and more accurate link failure detection, which can improve the user experience. The techniques described can also improve power savings, thereby increasing battery life. Since PDCCH monitoring with two TCI states is mainly used to improve transmission reliability, specific implementations of this subject matter can achieve more precise beam failure recovery, which can reduce interruptions caused by frequent beam failure recovery attempts due to mismatched beam failure detection.

[0046] Figure 1FIG. 0 shows an example of a wireless communication system 100 that supports the use of beam failure detection RS resource sets for PDCCH repetition. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an enhanced LTE (LTE-A) network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices, or any combination thereof.

[0047] The base stations 105 may be dispersed throughout a geographical area to form the wireless communication system 100, and may be devices of different forms or having different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110, and the UEs 115 and the base stations 105 may establish one or more communication links 125 over the coverage area 110. The coverage area 110 may be an example of such a geographical area over which the base stations 105 and the UEs 115 may support the transmission of signals according to one or more radio access technologies.

[0048] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices of different forms or having different capabilities. In Figure 1 FIG. 8 shows some example UEs 115. The UEs 115 described herein are capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), as Figure 1 shown.

[0049] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130) on the backhaul links 120 (e.g., via X2, Xn, or other interfaces), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0050] One or more of the base stations 105 described herein may include or may be referred to by those skilled in the art as a base station transceiver, radio base station, access point, radio transceiver, Node B, evolved Node B (eNB), next-generation Node B, or Gigabit Node B (either of which may be referred to as a gNB), home Node B, home evolved Node B, or other suitable terms.

[0051] The UE 115 may include or may be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, where the "device" may also be referred to as a unit, station, terminal, or client, among other examples. The UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine type communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, and other examples.

[0052] The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s that may sometimes act as repeaters, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as Figure 1 shown.

[0053] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 over one or more carriers. The term "carrier" may refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating the operation of the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. According to a carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0054] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and may be placed according to a channel raster for discovery by UE 115. A carrier may operate in stand-alone mode, where UE 115 performs initial acquisition and connection via the carrier, or a carrier may operate in non-stand-alone mode, where a different carrier (e.g., of the same or a different radio access technology) is used to anchor the connection.

[0055] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from UE 115 to the base station 105 or a downlink transmission from the base station 105 to UE 115. A carrier may carry downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0056] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or the wireless communication system 100. For example, the carrier bandwidth may be one of a number of defined bandwidths for a carrier of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of the carrier bandwidth.

[0057] The signal waveform transmitted on a carrier can be composed of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system adopting MCM techniques, a resource element can include a symbol period (e.g., the duration of a modulated symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate for UE 115 can be. Wireless communication resources can refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity for communication with UE 115.

[0058] One or more numerologies for a carrier can be supported, where a numerology can include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different numerologies. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and the communication for UE 115 can be restricted to one or more active BWPs.

[0059] The time interval for base station 105 or UE 115 can be represented as a multiple of a basic time unit, which can be, for example, a sampling period of T s = 1 / (Δf max ·N f ) seconds, where Δf max can represent the maximum supported subcarrier spacing, and N f can represent the maximum supported discrete Fourier transform (DFT) size). The time intervals of communication resources can be organized according to radio frames, each of which has a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0060] Each frame may include a plurality of consecutively numbered sub - frames or time slots, and each sub - frame or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into sub - frames, and each sub - frame may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the sub - carrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix added in front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini - time slots each containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f f

[0061] Sub - frames, time slots, mini - time slots, or symbols may be the smallest scheduling units (e.g., in the time domain) of the wireless communication system 100 and may be referred to as transmission time intervals (TTIs). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in the form of a burst of shortened TTIs (sTTIs)).

[0062] Physical channels may be multiplexed on a carrier according to various techniques. For example, time - division multiplexing (TDM) techniques, frequency - division multiplexing (FDM) techniques, or one or more of hybrid TDM - FDM techniques may be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., CORESET) for a physical control channel may be defined by the number of symbol periods and may extend across the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESET) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to a plurality of UEs 115 and a UE - specific search space set for sending control information to a particular UE 115.

[0063] In some examples, base station 105 may be movable and, thus, provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In some other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for respective geographic coverage areas 110.

[0064] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. The UE 115 may be designed to support ultra-reliability, low latency, or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication and may be supported by one or more mission-critical services such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency may be used interchangeably herein.

[0065] In some examples, the UE 115 is capable of communicating directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0066] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that routes packets to or interconnects with an external network (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for a UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet switched streaming services.

[0067] Some network devices in the network equipment (e.g., the base station 105) may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with a UE 115 through one or more other access network transmission entities 145 (which may be referred to as radio heads, intelligent radio heads, or transmit / receive points (TRPs)). Each access network transmission entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or the base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., the base station 105).

[0068] The wireless communication system 100 may operate using one or more frequency bands (generally in the range of 300 megahertz (MHz) to 300 gigahertz (GHz)). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or the decimeter band because the wavelength range is approximately from one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may be sufficient to penetrate structures to serve a UE 115 located indoors in a macro cell. Compared to the transmission of smaller frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, the transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers).

[0069] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ licensed-assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices such as the base station 105 and the UE 115 can use carrier sensing for collision detection and avoidance. In some examples, operation in the unlicensed frequency band can be based on a carrier aggregation configuration that combines a component carrier operating in a licensed frequency band (e.g., LAA). Operations in the unlicensed spectrum can include downlink transmissions, uplink transmissions, peer-to-peer (P2P) transmissions, or device-to-device (D2D) transmissions, among other examples.

[0070] The base station 105 or the UE 115 can be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the base station 105 or the UE 115 can be located within one or more antenna arrays or antenna panels, which can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays can be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 can be located at different geographical locations. The base station 105 can have an antenna array having a number of rows and columns of antenna ports that the base station 105 can use to support beamforming for communication with the UE 115. Similarly, the UE 115 can have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel can support radio frequency beamforming for signals transmitted via the antenna ports.

[0071] Beamforming, which can also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., the base station 105, the UE 115) to form or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via the antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals transmitted via the antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with the device. The adjustment associated with each of the antenna elements can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0072] As part of beamforming operations, the base station 105 or the UE 115 may use beam scanning techniques. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. The base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device such as the base station 105 or by a receiving device such as the UE 115) to identify the beam direction for subsequent transmissions or receptions performed by the base station 105.

[0073] The base station 105 may transmit some signals (e.g., data signals associated with the receiving device) in a single beam direction (e.g., a direction associated with a particular receiving device such as the UE 115). In some examples, the beam direction associated with a transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, the UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report an indication of the signal received by the UE 115 that has the highest signal quality or otherwise acceptable signal quality.

[0074] In some examples, multiple beam directions may be used to perform transmissions by a device (e.g., by the base station 105 or the UE 115), and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may or may not be precoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by the base station 105 in one or more directions, the UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction for subsequent transmissions or receptions performed by the UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0075] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, a receiving device (e.g., UE 115) may attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device may receive by receiving via different antenna sub-arrays, by processing received signals according to different antenna sub-arrays, by receiving according to different sets of receive beamforming weights (e.g., different sets of directional listening weights) applied to signals received at multiple antenna elements of the antenna array, or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array (any of the above operations may be referred to as "listening" according to different receiving configurations or receiving directions), thereby attempting multiple receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receiving configuration may be aligned in a beam direction determined based on listening according to different receiving configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0076] Wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly for transmission over logical channels. The media access control (MAC) layer may perform priority handling and multiplexing of logical channels to transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between UE 115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0077] UE 115 may include a communication manager 160. In some implementations, the communication manager 160 may monitor PDCCH transmissions using at least two TCI states, identify characteristics of one or more of the at least two TCI states, determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring based on the characteristics of the one or more of the at least two TCI states, and monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0078] In some other implementations, the communication manager 160 may also monitor PDCCH transmissions using at least two TCI states, determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of a pair of reference signals configured based on one of the at least two TCI states, and at least monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

[0079] In some other implementations, the communication manager 160 may also monitor PDCCH transmissions using at least two TCI states, monitor the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations, at least monitor the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure, and determine that a radio link failure has occurred when the radio link quality of the PDCCH is below a threshold value for each of the two or more resource pair configurations.

[0080] Figure 2 An example of a wireless communication system 200 is shown, which supports the use of a beam failure detection RS resource set for PDCCH repetition. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 includes a base station 105-a and a UE 115-a, and the base station 105-a and the UE 115-a may be examples of the corresponding devices described Figure 1 above.

[0081] The base station 105-a may support communication with wireless devices within a coverage area 110-a. The base station 105-a may transmit signals via one or more beams 205-a to 205-d (collectively referred to herein as beams 205). In some other examples, the base station 105-a may use more or fewer Figure 2The four beams 205 shown in [Figure 0]. For example, base station 105-a may perform PDCCH transmissions to UE 115-a via beams 205-c and 205-d. In some other examples, base station 105-a may perform PDCCH transmissions using different arrangements and numbers of beams 205. UE 115-a may similarly transmit beams 210-a to 210-d (collectively referred to herein as beams 210).

[0082] Base station 105-a and UE 115-a may support beam indication, which may mean that some PDCCH transmissions may use the same transmission beam as the configured reference signal (e.g., CSI-RS or SSB). Beam indication may be based on the configuration of TCI states and downlink signaling. The TCI state may include a resource set of RSs and information about CSI-RS or SSB. For example, the TCI state may include a first RS in the resource set for QCL type A hypothesis indication and a second RS in the resource set for QCL-type D hypothesis indication. By associating the downlink transmission on the PDCCH with a specific TCI state that includes an RS in the resource set providing QCL type D hypothesis indication, base station 105-a may notify UE 115-a that it may assume that the PDCCH transmission is sent using the same spatial filter as the reference signal associated with the TCI state.

[0083] PDCCH transmissions or PDCCH candidates monitored using two TCI states may be associated with an alternative number of CORESETs and SS sets. For example, PDCCH transmissions or PDCCH candidates may be monitored in a single CORESET configured with two active TCI states. Alternatively, PDCCH transmissions or PDCCH candidates may be monitored in one SS set associated with two different CORESETs, and each CORESET may be configured to have an active TCI state. Another alternative is that PDCCH transmissions or PDCCH candidates may be monitored in two SS sets, and the two SS sets may be associated with two CORESETs, each CORESET configured with an active TCI state. These alternatives may affect the following aspects of communication: multiplexing schemes (TDM, FDM, spatial division multiplexing (SDM), or combined schemes), blind decoding or CCE limitations, overbooking, CCE and resource element group (REG) mapping, PDCCH candidate CCEs (i.e., hash functions), CORESET / SS set configuration, and other process impacts.

[0084] In some implementations, base station 105-b may transmit PDCCH transmissions using one or more beams 205 associated with one or more TCI states. UE 115-a may receive PDCCH transmissions on two or more beams 205 indicated by an RS resource set associated with two or more TCI states. For example, UE 115-a may use at least two TCI states to monitor PDCCH transmissions.

[0085] However, there may be a case where at least one of the beams 205 fails. Beam failure may occur due to obstacles in the path, power loss, interference, changes in channel conditions, multipath effects, etc. UE 115-a may need to determine when beam failure has occurred. The techniques described herein enable UE 115-a to determine when at least one beam failure has occurred for multi-beam transmissions.

[0086] UE 115-a may monitor the radio link quality of PDCCH transmissions for beam failure. In some examples, when the error probability for PDCCH transmissions exceeds a threshold value, UE 115-a may detect that beam failure has occurred. In some other examples, UE 115-a may detect that beam failure has occurred based on measurements of reference signals associated with the PDCCH. For example, UE 115-a may assume that beam failure has occurred based on measurements of periodic CSI-RS associated with the PDCCH TCI state. To detect beam failure based on measurements of reference signals, UE 115-a may use one or more index sets to detect beam failure. The techniques described herein provide methods for UE 115-a to determine one or more index sets, how to detect beam failure, and how to report beam failure.

[0087] Figure 3 An example of a process flow 300 that supports the use of a beam failure detection RS resource set for PDCCH repetition is shown. In some examples, process flow 300 may implement aspects of wireless communication system 100. Process flow 300 may include base station 105-b and UE 115b, which may be examples of the corresponding devices referenced Figure 1 and Figure 2 and described.

[0088] Base station 105-b may send configuration information 305 to UE 115-b. The configuration information 305 may include one or more TCI states. In some examples, the configuration information 305 may include a downlink control information (DCI) message, and the DCI message may include one or more TCI states. The configuration information 305 may indicate to UE 115-b that PDCCH transmissions or PDCCH candidates can be monitored using two TCI states. Base station 105-a may use at least one CORESET associated with the at least two TCI states, a search space set associated with at least two CORESETS, or two search space sets associated with two CORESETS each having an active TCI state to send PDCCH transmissions.

[0089] In some examples, for each BWP of the serving cell, a set q0 of periodic CSI-RS resource configuration indices may be provided to the UE via failureDetectionResources, and a set q1 of periodic CSI-RS resource configuration indices and / or SS / PBCH block indices may be provided to the UE via candidateBeamRSList, candidateBeamRSListExt-r16, candidateBeamRSSCellList-r16, or any other such suitable signaling for radio link quality measurement on the BWP of the serving cell. If failureDetectionResources or beamFailureDetectionResourceList for the BWP of the serving cell does not provide q0 to the UE, the UE determines the set q0 to include periodic CSI-RS resource configuration indices that have the same values as the RS indices in the RS set indicated by the TCI state of the corresponding CORESET used by the UE to monitor the PDCCH, and if there are two RS indices in the RS set indicated by the TCI state, the set q0 includes the RS index having the QCL type D configuration for the TCI state.

[0090] At 310, UE 115-b may use the TCI state to monitor PDCCH transmissions. UE 115-b may use at least one CORESET associated with the at least two TCI states, a search space set associated with at least two CORESETS, or two search space sets associated with two CORESETS each having an active TCI state to monitor PDCCH transmissions.

[0091] In some implementations, the configuration information 305 may not include the failureDetectionResources for the set q0. The UE 115-b may determine the set q0 that it can use to detect beam failures. In some examples, the UE 115-b may report two new beam indications to the base station 105-b, which may be in the q new element. When monitoring at least one of the PDCCH transmissions or PDCCH candidates using two TCI states and the beam failure detection RS set q0 is not configured for the BWP of the serving cell, the UE 115-b may determine the set q0 to include the periodic CSI-RS resource configuration index that has the same value as the RS index in the RS set indicated by one or two TCI states used by the UE 115-b to monitor the PDCCH. If there are two RS indexes in the RS set indicated by the TCI state, the set q0 includes the RS index with the QCL type D configuration for the TCI state.

[0092] If there are two TCI states (such as a first TCI state and a second TCI state) for monitoring the same PDCCH, the UE 115-b will further determine how to include the RS indexes of the two TCI states into the set q0. For example, the two TCI states for monitoring the same PDCCH may provide QCL type D RSs, and there may be two QCL type D RSs for monitoring the same PDCCH. At 315, the UE 115-b may identify the characteristics of the first TCI state to determine the beam failure detection resource RS set. For example, if there are two TCI states (such as a first TCI state and a second TCI state) for monitoring the same PDCCH, the UE 115-b may determine the set q0 to include the periodic CSI-RS resource configuration index that has the same value as the RS index in the RS set indicated by the first TCI state used by the UE 115-b to monitor the PDCCH. The characteristics of the first TCI state may be based on, for example, the order of the TCI states used to monitor the same PDCCH (e.g., the first TCI may be used), the smaller TCI state identifier, the smaller CORESET identifier, or the smaller search space identifier. In some examples, both the first TCI state and the second TCI state may be used for the beam failure detection resource RS set. For example, if there are two TCI states (such as a first TCI state and a second TCI state) for monitoring the same PDCCH, the UE 115-b may determine the set q0 to include the periodic CSI-RS resource configuration index that has the same value as the RS index in the RS set indicated by the first TCI state and the RS index in the RS set indicated by the second TCI state used by the UE 115-b to monitor the PDCCH.

[0093] At 320, UE 115-b may determine a first beam failure detection resource RS set based on the characteristics of the first TCI state. For example, UE 115-b may set the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index that has the same value as the reference signal index value in the reference signal set indicated as the first TCI state by the order of at least two TCI states, and if there are two RS indexes in the reference signal set indicated by the first TCI state, the first beam failure detection reference signal resource set includes the RS index having the QCL type D configuration for the corresponding TCI state. In another example, UE 115-b may select the first TCI state from at least two TCI states at least partially based on the identification, and set the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index that has the same value as the reference signal index value in the reference signal set indicated by the first TCI state.

[0094] In some examples, UE 115-b may determine set q0 to include a list of RS pairs, where the RS pairs are associated with one or two TCI states used to monitor the same PDCCH. For example, UE 115-b may use a list of reference signal pairs at least partially based on the configuration of one of at least two TCI states used to monitor the same PDCCH to determine the first beam failure detection reference signal resource set associated with PDCCH monitoring. In some examples, determining the first beam failure detection reference signal resource set to include a list of reference signal pairs may also be at least partially based on at least two TCI states used to monitor the same PDCCH.

[0095] In some other examples, the beam failure detection reference signal resource set is defined or may be configured with two or more resource pair configurations, where each resource pair configuration may have one or two periodic RSs.

[0096] In some implementations, the UE 115-b may determine a second beam failure detection resource RS set at 325. The second beam failure detection reference signal resource set may be associated with PDCCH monitoring. In some examples, the UE 115-b may determine the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in the first reference signal set indicated by the first TCI state among at least two TCI states, and determine the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in the second reference signal set indicated by the second TCI state among at least two TCI states. If there are two RS indices in the reference signal set indicated by the TCI state, the corresponding beam failure detection reference signal resource set includes the RS index having the QCL type D configuration for the corresponding TCI state.

[0097] In some other implementations, the UE 115-b may set the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in the first reference signal set indicated by the TCI state among at least two TCI states, where the TCI state is associated with a smaller TRP identifier, a smaller TCI state identifier, a smaller CORESET identifier, or a smaller search space identifier for monitoring the same PDCCH. The UE 115-b may set the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in the second reference signal set indicated by the second TCI state among at least two TCI states for monitoring the same PDCCH.

[0098] The base station 105-b may send one or more PDCCH transmissions 330 to the UE 115-b. At 335, the UE 115-b may monitor the first beam failure detection resource RS set for potential beam failure. In some examples, at 340, the UE 115-b may monitor the second beam failure detection resource RS set for beam failure. Monitoring the beam failure detection resource RS set may include measuring associated reference signals (such as periodic CSI-RS associated with the TCI state).

[0099] At 345, UE 115-b may detect that a beam failure has occurred. UE 115-b may determine that a beam failure has occurred based at least in part on monitoring at least a first beam failure detection reference signal resource set. In some examples, when the radio link quality of the PDCCH is below a threshold for each of two or more resource pair configurations, UE 115-b may determine that a radio link failure has occurred. The threshold may be configured by UE 115-b or base station 105-b. At 350, if applicable, UE 115-b may detect that a second beam failure has occurred.

[0100] UE 115-b may provide an indication 355 of one or more detected beam failures to base station 105-b. Indication 355 may identify which beam has the beam failure. The indication may also include a set of candidate beams (e.g., q1) for establishing a connection. In some implementations, UE 115-b provides the indication of the beam failure to a network layer higher than the physical layer at UE 115-b.

[0101] At 360, base station 105-b may attempt to re-establish a connection with UE 115-b. If a candidate beam list is included in beam failure indication 255, base station 105-b may use the candidate beam list.

[0102] The techniques described may improve efficiency and communication for communicating using multiple TCI states, improve beam failure detection, and improve beam failure recovery. The techniques described may improve the user experience through improved throughput, more accurate link failure detection, and improved power savings.

[0103] Figure 4 A schematic illustration of a system 400 including a device 405 that supports beam failure detection RS resource sets for PDCCH repetition is shown. Device 405 may be an example of a component of UE 115 as described herein or may include components of UE 115. Device 405 may include components for two-way voice and data communication, which include components for sending and receiving communications, including a communication manager 410, an I / O controller 415, a transceiver 420, an antenna 425, a memory 430, and a processor 440. These components may communicate electronically via one or more buses (e.g., bus 445).

[0104] The communication manager 410 may implement at least some of the techniques described herein. The communication manager 410 may determine that at least two TCI states can be used to transmit PDCCH transmissions. The communication manager 410 may monitor PDCCH transmissions using at least two TCI states. The communication manager 410 may identify characteristics of one or more of the at least two TCI states. The communication manager 410 may use the characteristics of one or more of the at least two TCI states to determine a beam failure detection reference signal resource set.

[0105] In some examples, the communication manager 410 may set a first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index that has the same value as the value of the reference signal index in the reference signal set indicated by the characteristic. For example, the communication manager 410 may set the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index that has the same value as the value of the reference signal index in the reference signal set of the first TCI state. The first TCI state may be indicated by the order of the at least two TCI states. In another example, the first TCI state may be indicated based on an identification or configuration signal sent by the base station.

[0106] In some examples, the communication manager 410 may select the first TCI state based on the minimum identification of the at least two TCI states. In some examples, the identification includes one of a TCI state identification, a CORESET identification, or a search space identification. In some examples, determining the first beam failure detection reference signal resource set further includes: setting the first beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index that has the same value as the value of the reference signal index in the first reference signal set indicated by the TCI state among the at least two TCI states, where the TCI state is associated with a smaller TRP identification, a smaller TCI state identification, a smaller CORESET identification, or a smaller search space identification.

[0107] In another implementation, the communication manager 410 may use a list of a pair of reference signals configured based on one of the at least two TCI states to determine a first beam failure detection reference signal resource set associated with PDCCH monitoring.

[0108] In some examples, the communication manager 410 determines a second beam failure detection reference signal resource set. In some examples, determining the second beam failure detection reference signal resource set further includes setting the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the second reference signal set indicated by the second TCI state of the at least two TCI states.

[0109] Regardless of how the first beam failure detection reference signal resource set is determined, the communication manager 410 can monitor the first beam failure detection reference signal resource set associated with PDCCH monitoring to identify beam failure.

[0110] In some implementations, the communication manager 410 can monitor the radio link quality of the PDCCH based on the beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations. In some examples, the communication manager 410 can determine a second beam failure detection reference signal resource set associated with PDCCH monitoring.

[0111] The communication manager 410 can also use at least two TCI states to monitor PDCCH transmission, monitor the radio link quality of the PDCCH based on the beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations, at least monitor the beam failure detection reference signal resource set associated with PDCCH monitoring to identify radio link failure, and determine that radio link failure has occurred when the radio link quality of the PDCCH is below the threshold limit for each of the two or more resource pair configurations.

[0112] In some examples, the communication manager 410 can monitor at least one CORESET associated with at least two TCI states, monitor a search space set associated with at least two CORESETs, or monitor two search space sets associated with two CORESETs, each CORESET having an active TCI state. The communication manager 410 can use one or more characteristics of one or more of the at least two TCI states to determine a first beam failure detection reference signal resource set associated with PDCCH monitoring based on one or more of the at least two TCI states.

[0113] In some implementations, communication manager 410 may determine that a radio link failure has occurred, at least in part, based on monitoring. In some examples, communication manager 410 may determine that a radio link failure has occurred when the radio link quality of the PDCCH is below the threshold limit for each of two or more resource pair configurations. In some examples, communication manager 410 may detect a radio link failure based on at least monitoring a first beam failure detection reference signal resource set.

[0114] In some examples, communication manager 410 may send an indication of the radio link failure to the base station. In some examples, communication manager 410 may provide an indication of the radio link failure to a higher layer of the UE.

[0115] Communication manager 410 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of communication manager 410 or its sub-components may be performed by a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0116] Communication manager 410 or its sub-components may be physically located at various positions, including being distributed such that portions of the functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, communication manager 410 or its sub-components may be separate and distinct components. In some examples, according to various aspects of this disclosure, communication manager 410 or its sub-components may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or a combination thereof.

[0117] In some examples, when communication manager 410 serves as a processor or a processing system, signaling may be obtained from a receiver (e.g., transceiver 420) using a first interface, and signaling for transmission via a transmitter (e.g., transceiver 420) may be output using a second interface.

[0118] I / O controller 415 may manage input and output signals for device 405. I / O controller 415 may also manage peripheral devices not integrated into device 405. In some cases, I / O controller 415 may represent a physical connection or port to an external peripheral device. In some examples, I / O controller 415 may utilize, such as an operating system such as the one described above or another known operating system. In some other cases, the I / O controller 415 may represent a modem, a keyboard, a mouse, a touch screen, or a similar device or interact with the above devices. In some examples, the I / O controller 415 may be implemented as part of a processor. In some examples, the user may interact with the device 405 via the I / O controller 415 or via the hardware components controlled by the I / O controller 415.

[0119] The transceiver 420 may communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 420 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 420 may also include a modem that modulates packets and provides the modulated packets to the antenna for transmission, and demodulates packets received from the antenna. The transceiver 420 may send or receive information related to PDCCH transmission, beam failure detection, and beam failure recovery.

[0120] In some cases, the wireless device may include a single antenna 425. However, in some cases, the device may have more than one antenna 425 that can simultaneously send or receive multiple wireless transmissions.

[0121] The memory 430 may include random access memory (RAM) and read-only memory (ROM). The memory 430 may store computer-readable, computer-executable code 435 that includes instructions that, when executed, cause the processor to perform the various functions described herein. In some examples, in addition, the memory 430 may further contain a basic input / output system (BIOS) that may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0122] The processor 440 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some examples, the processor 440 may be configured to operate a memory array using a memory controller. In some other examples, the memory controller may be integrated into the processor 440. The processor 440 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 430) to cause the device 405 to perform various functions (e.g., support functions or tasks using beam failure detection RS resource sets for PDCCH repetition).

[0123] Processor 440 can be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 405 (e.g., within memory 430). For example, processor 440 can execute communication manager 410 or I / O controller 415.

[0124] In some implementations, processor 440 can be a component of a processing system. A processing system generally can refer to a system or series of machines or components that receive input and process the input to produce a set of outputs that can be passed to other systems or components such as, for example, device 405. For example, the processing system of device 405 can refer to a system that includes various other components or subcomponents of device 405.

[0125] The processing system of device 405 can be connected to other components of device 405 and can process information (e.g., input or signals) received from other components, output information to other components, etc. For example, a chip or modem of device 405 can include a processing system, a first interface for outputting information, and a second interface for obtaining information. In some examples, the first interface can refer to an interface between the processing system of the chip or modem and a transmitter such that device 405 can send information output from the chip or modem. In some examples, the second interface can refer to an interface between the processing system of the chip or modem and a receiver such that device 405 can obtain information or signal input and the information can be passed to the processing system. Those of ordinary skill in the art will readily recognize that the first interface can also obtain information or signal input and that the second interface can also output information or signal output.

[0126] Code 435 can include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communication. Code 435 can be stored in a non-transitory computer-readable medium (e.g., system memory or other type of memory). In some examples, code 435 may not be directly executable by processor 440 but can cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0127] In some examples, communication manager 410 can be implemented as an integrated circuit or chipset for a mobile device modem, and a receiver and transmitter can be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception over one or more frequency bands.

[0128] The communication manager 410 as described herein can be implemented to realize one or more potential advantages. In some implementations of the present disclosure, the communication manager 410 can use one or more of at least two TCI states to determine at least one beam failure detection reference signal resource set associated with PDCCH monitoring. The communication manager 410 can use the beam failure detection reference signal resource set to detect beam failure. Accordingly, the communication manager 410 can detect beam failure of communications using multiple beams with two or more TCI states, which can result in improved throughput, improved user experience, and improved power savings and longer battery life of the device 405.

[0129] Figure 5 A flowchart illustrating an example method 500 for supporting beam failure detection RS resource sets for PDCCH repetition is shown. The operations of method 500 can be implemented by the UE 115 or its components as described herein. For example, the operations of method 500 can be performed by a communication manager as referenced Figure 1 and Figure 4 described. In some examples, the UE can execute a set of instructions to control functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0130] At 505, the UE can monitor PDCCH transmissions using at least two TCI states. The operation at 505 can be performed according to the methods described herein. In some examples, aspects of the operation at 505 can be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0131] At 510, the UE can identify characteristics of one or more of the at least two TCI states. The operation at 510 can be performed according to the methods described herein. In some examples, aspects of the operation at 510 can be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0132] At 515, based on the characteristics of one or more of the at least two TCI states, the UE can use one or more of the at least two TCI states to determine a first beam failure detection reference signal resource set associated with PDCCH monitoring. The operation at 515 can be performed according to the methods described herein. In some examples, aspects of the operation at 515 can be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0133] At 520, the UE may monitor a first beam failure detection reference signal resource set associated with PDCCH monitoring to identify beam failure. The operations at 520 may be performed according to the methods described herein. In some examples, aspects of the operations at 520 may be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0134] Figure 6 FIG. shows a flowchart illustrating an example method 600 that supports reusing a beam failure detection RS resource set for PDCCH. The operations of method 600 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 600 may be performed by a communication manager as referenced Figures 1 to 4 described. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0135] At 605, the UE may monitor PDCCH transmissions using at least two TCI states. The operations at 605 may be performed according to the methods described herein. In some examples, aspects of the operations at 605 may be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0136] At 610, the UE may determine a first beam failure detection reference signal resource set associated with PDCCH monitoring using a list of a pair of reference signals configured based on one of at least two TCI states. The operations at 610 may be performed according to the methods described herein. In some examples, aspects of the operations at 610 may be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0137] At 615, the UE may monitor at least a first beam failure detection reference signal resource set associated with PDCCH monitoring to identify beam failure. The operations at 615 may be performed according to the methods described herein. In some examples, aspects of the operations at 615 may be performed by a communication manager as referenced Figure 1 and Figure 4 described.

[0138] Figure 7 FIG. shows a flowchart illustrating an example method 700 that supports using a beam failure detection RS resource set for PDCCH repetition. The operations of method 700 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 700 may be performed by a communication manager as referenced Figure 1 and Figure 4The described communication manager performs. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0139] At 705, the UE may monitor PDCCH transmissions using at least two TCI states. The operation of 705 may be performed according to the methods described herein. In some examples, aspects of the operation of 705 may be performed by a communication manager as referenced Figure 1 and Figure 4 the described communication manager.

[0140] At 710, the UE may monitor the radio link quality of the PDCCH based on a beam failure detection reference signal resource set, where the beam failure detection reference signal resource set defines two or more resource pair configurations. The operation of 710 may be performed according to the methods described herein. In some examples, aspects of the operation of 710 may be performed by a communication manager as referenced Figure 1 and Figure 4 the described communication manager.

[0141] At 715, the UE may at least monitor the beam failure detection reference signal resource set associated with PDCCH monitoring to identify a radio link failure. The operation of 715 may be performed according to the methods described herein. In some examples, aspects of the operation of 715 may be performed by a communication manager as referenced Figure 1 and Figure 4 the described communication manager.

[0142] At 720, when the radio link quality of the PDCCH is below a threshold value for each of two or more resource pair configurations, the UE may determine that a radio link failure has occurred. The operation of 720 may be performed according to the methods described herein. In some examples, aspects of the operation of 720 may be performed by a communication manager as referenced Figure 1 and Figure 4 the described communication manager.

[0143] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example and the LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond the scope of LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to a variety of other wireless communication systems such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0144] As used herein, the phrase "at least one of" in reference to a list of items refers to any combination of those items, including a single member. As an example, "at least one of a, b, or c" is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c.

[0145] The various illustrative logical, logical block, modules, circuits, and algorithmic processes described in connection with the implementations disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. The interchangeability of hardware and software has been described generally in terms of functionality and illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0146] The hardware and data processing apparatus for implementing the various illustrative logical, logical block, modules, and circuits described in connection with the aspects disclosed herein may be implemented or performed with a general purpose single-chip or multi-chip processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration). In some implementations, particular processes and methods may be performed by circuitry specific to a given function.

[0147] In one or more aspects, the described functionality may be implemented in hardware, digital electronic circuitry, computer software, firmware, combinations of the structures disclosed in this specification and their structural equivalents, or in any combination thereof. The implementation of the subject matter described in this specification may also be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a computer storage medium for execution by, or to control the operation of, a data processing apparatus.

[0148] Various modifications to the implementations described in this disclosure may be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the claims are not limited to the implementations shown herein but are accorded the broadest scope consistent with the disclosure, the principles, and the novel features disclosed herein.

[0149] Furthermore, those of ordinary skill in the art will readily understand that the terms “upper” and “lower” are sometimes used for convenience in describing the drawings and indicate relative positions corresponding to the graphical orientation on a correctly oriented page and may not reflect the correct orientation of any device as implemented.

[0150] Certain features that are described in the context of separate implementations in this specification may also be implemented in combination in a single implementation. Conversely, various features that are described in the context of a single implementation may also be implemented separately or in any suitable sub-combination in multiple implementations. Additionally, although the features may be described above as acting in certain combinations and even initially claimed in such a manner, in some examples, one or more features from the claimed combination may be removed from the combination, and the claimed combination may be directed to a sub-combination or a variation of the sub-combination.

[0151] Similarly, although the operations are described in a particular order in the figures, this should not be understood to require that such operations be performed in the particular order shown or in a sequential order, or that all of the illustrated operations be performed, to obtain the desired result. Additionally, the figures may schematically depict one or more example processes in the form of a flowchart. However, other operations not shown may be incorporated into the example processes schematically illustrated. For example, one or more additional operations may be performed before, after, simultaneously with, or between any of the illustrated operations. In certain cases, multitasking and parallel processing may be advantageous. Furthermore, the separation of the various system components in the above-described implementations should not be understood to be required in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products. Additionally, other implementations are within the scope of the following claims. In some examples, the acts recited in the claims may be performed in a different order and still obtain the desired result.

Claims

1. An apparatus for wireless communication at a device of a user equipment (UE), comprising: a processing system configured to: monitor physical downlink control channel (PDCCH) transmissions using at least two transmission control indicator (TCI) states; identify characteristics of one or more of the at least two TCI states; select two TCI states from the at least two TCI states, wherein the two TCI states are associated with the same control resource set (CORESET); determine, at least in part based on the characteristics of the two TCI states, a first beam failure detection reference signal resource set associated with the PDCCH monitoring using the two TCI states; and monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

2. The apparatus according to claim 1, wherein, the characteristics of the one or more of the at least two TCI states is an order of the at least two TCI states, wherein the processing system is further configured to: set the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index having a value same as a value of a reference signal index in a reference signal set indicated as a first TCI state by the order of the two TCI states.

3. The apparatus according to claim 1, wherein, the characteristics of the one or more of the at least two TCI states is an identification, wherein the processing system is further configured to: select a first TCI state of the two TCI states at least in part based on the identification; and set the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index having a value same as a value of a reference signal index in a reference signal set indicated by the first TCI state.

4. The apparatus according to claim 3, wherein, the identification includes one of a TCI state identification, a CORESET identification, or a search space identification.

5. The apparatus according to claim 3, wherein, the processing system configured to select the first TCI state is further configured to: select the first TCI state at least in part based on a minimum identification of the two TCI states.

6. The apparatus according to claim 1, wherein, the processing system is further configured to: determine a second beam failure detection reference signal resource set associated with the PDCCH monitoring.

7. The apparatus according to claim 6, wherein: Determining the first beam failure detection reference signal resource set further configures the processing system to: set the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the first reference signal set indicated by the first TCI state among the two TCI states; and Determining the second beam failure detection reference signal resource set further configures the processing system to: set the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the second reference signal set indicated by the second TCI state among the two TCI states.

8. The apparatus according to claim 6, wherein: Determining the first beam failure detection reference signal resource set further configures the processing system to: set the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the first reference signal set indicated by the TCI state among the two TCI states, the TCI state being associated with a smaller transmit / receive point (TRP) identifier, a smaller TCI state identifier, a smaller control resource set (CORESET) identifier, or a smaller search space identifier; and Determining the second beam failure detection reference signal resource set further configures the processing system to: set the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the second reference signal set indicated by the second TCI state among the two TCI states.

9. The apparatus according to claim 1, wherein, the processing system is further configured to: detect a radio link failure at least partially based on monitoring at least the first beam failure detection reference signal resource set; and wherein, the apparatus further includes: a first interface configured to output an indication of the radio link failure for transmission to a network entity.

10. The apparatus according to claim 1, wherein, the processing system configured to monitor the PDCCH transmission further configures the processing system to: monitor at least one CORESET associated with the at least two TCI states; monitor a search space set associated with at least two CORESETs; or monitor two search space sets associated with two CORESETs each having an active TCI state.

11. An apparatus for wireless communication at a device of a user equipment (UE), comprising: a processing system configured to: monitor physical downlink control channel (PDCCH) transmissions using at least two transmission control indicator (TCI) states; Determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs configured at least in part based on one of the at least two TCI states; And At least monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

12. The apparatus according to claim 11, Wherein, The processing system configured to determine the first beam failure detection reference signal resource set includes the list of the reference signal pairs or is at least in part based on the at least two TCI states.

13. An apparatus for wireless communication at a user equipment (UE) device, Comprising: A processing system configured to: Monitor physical downlink control channel (PDCCH) transmissions using at least two transmission control indicator (TCI) states; Determine a beam failure detection reference signal resource set associated with the PDCCH monitoring using the two TCI states or using a list of reference signal pairs configured at least in part based on one of the at least two TCI states, at least in part based on characteristics of two TCI states selected from the at least two TCI states, wherein the two TCI states are included in the same control resource set (CORESET); Monitor the radio link quality of the PDCCH at least in part based on the beam failure detection reference signal resource set, wherein the beam failure detection reference signal resource set defines two or more resource pair configurations, and each resource pair configuration in the resource pair configurations has one or two periodic reference signals; At least monitor the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and Determine that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

14. The apparatus according to claim 13, Wherein, The processing system is further configured to: Provide an indication of the radio link failure to a higher layer of the UE.

15. A method for wireless communication at a user equipment (UE) device, Comprising: Monitor physical downlink control channel (PDCCH) transmissions using at least two transmission control indicator (TCI) states; Identify characteristics of one or more of the at least two TCI states; Select two TCI states from the at least two TCI states, wherein the two TCI states are associated with the same control resource set (CORESET); Determine a first beam failure detection reference signal resource set associated with the PDCCH monitoring using the two TCI states at least in part based on the characteristics of the two TCI states; and Monitor the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

16. The method according to claim 15, Among them, the characteristic of one or more of the at least two TCI states is the order of the at least two TCI states, and wherein determining the first beam failure detection reference signal resource set further includes: setting the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the reference signal set indicated as the first TCI state by the order of the two TCI states.

17. The method according to claim 15, wherein, the characteristic of one or more of the at least two TCI states is an identifier, and wherein determining the first beam failure detection reference signal resource set further includes: selecting a first TCI state of the two TCI states at least in part based on the identifier; and setting the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the reference signal set indicated by the first TCI state.

18. The method according to claim 17, wherein, the identifier includes one of a TCI state identifier, a CORESET identifier, or a search space identifier.

19. The method according to claim 17, wherein: selecting the first TCI state is at least in part based on the minimum identifier of the two TCI states.

20. The method according to claim 15, further includes: determining a second beam failure detection reference signal resource set associated with the PDCCH monitoring.

21. The method according to claim 20, wherein: determining the first beam failure detection reference signal resource set further includes: setting the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the first reference signal set indicated by the first TCI state of the two TCI states; and determining the second beam failure detection reference signal resource set further includes: setting the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index, the periodic CSI-RS resource configuration index having the same value as the value of the reference signal index in the second reference signal set indicated by the second TCI state of the two TCI states.

22. The method according to claim 20, wherein: Determining the first beam failure detection reference signal resource set further includes: setting the first beam failure detection reference signal resource set to include a periodic channel state information reference signal (CSI-RS) resource configuration index having the same value as the reference signal index value in the first reference signal set indicated by the TCI state among the two TCI states, where the TCI state is associated with a smaller transmit / receive point (TRP) identifier, a smaller TCI state identifier, a smaller control resource set (CORESET) identifier, or a smaller search space identifier; and Determining the second beam failure detection reference signal resource set further includes: setting the second beam failure detection reference signal resource set to include a periodic CSI-RS resource configuration index having the same value as the reference signal index value in the second reference signal set indicated by the second TCI state among the two TCI states.

23. The method according to claim 15, further including: detecting a radio link failure at least partially based on monitoring at least the first beam failure detection reference signal resource set; and sending an indication of the radio link failure to a network entity.

24. The method according to claim 15, wherein monitoring the PDCCH transmission further includes: monitoring at least one CORESET associated with the at least two TCI states; monitoring one search space set associated with at least two CORESETS; or monitoring two search space sets associated with two CORESETS each having an active TCI state.

25. A method for wireless communication at a device of a user equipment (UE), including: monitoring physical downlink control channel (PDCCH) transmission using at least two transmission control indicator (TCI) states; determining a first beam failure detection reference signal resource set associated with the PDCCH monitoring using a list of reference signal pairs at least partially configured based on one of the at least two TCI states; and monitoring at least the first beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a beam failure.

26. The method according to claim 25, wherein: determining the first beam failure detection reference signal resource set includes the list of the reference signal pairs or is at least partially based on the at least two TCI states.

27. A method for wireless communication at a device of a user equipment (UE), including: monitoring physical downlink control channel (PDCCH) transmission using at least two transmission control indicator (TCI) states; Determine a beam failure detection reference signal resource set associated with the PDCCH monitoring by using the two TCI states at least partially based on characteristics of the two TCI states selected from the at least two TCI states, or by using a list of reference signal pairs configured at least partially based on one TCI state among the at least two TCI states, wherein the two TCI states are included in the same control resource set (CORESET); Monitor the radio link quality of the PDCCH at least partially based on the beam failure detection reference signal resource set, wherein the beam failure detection reference signal resource set defines two or more resource pair configurations, and each resource pair configuration in the resource pair configurations has one or two periodic reference signals; At least monitor the beam failure detection reference signal resource set associated with the PDCCH monitoring to identify a radio link failure; and Determine that the radio link failure has occurred when the radio link quality of the PDCCH is below a threshold for each of the two or more resource pair configurations.

28. The method according to claim 27, further comprising: Providing an indication of the radio link failure to a higher layer of the UE.

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