Virtual search space for beam indication

Abstract

Methods, systems, and devices for wireless communication are described. A base station can identify time and frequency resources for a physical downlink shared channel (PDSCH) to be transmitted to a user equipment (UE) in a first transmission time interval (TTI). The base station can transmit configuration information for a control channel search space set in a second TTI. The second TTI can precede the first TTI. The configuration information can include an indication of an absence of a physical downlink control channel (PDCCH) transmission to be transmitted in the control channel search space set indicating the identified time and frequency resources for the PDSCH and a set of time and frequency resources for the control channel search space set. The UE can receive the configuration information and identify the time and frequency resources allocated for the PDSCH in the second TTI and receive the PDSCH transmission in the second TTI.

Description

[0001] This application is a continuation of Patent Application No. 16 / 267,298 for “VIRTUAL SEARCH SPACES FOR BEAM INDICATION” filed February 4, 2019, in the name of NAM et al., and U.S. Provisional Patent Application No. 62 / 710,486 for “VIRTUAL SEARCH SPACES FOR BEAM INDICATION” filed February 16, 2018, in the name of NAM et al., each of which is assigned to the assignee hereof and herein incorporated by reference in its entirety for all purposes.

[0002] Cross Reference To Related Applications

[0003] This Patent Application claims the benefit of U.S. Patent Application No. 16 / 267,298 for “VIRTUAL SEARCH SPACES FOR BEAM INDICATION” filed February 4, 2019, in the name of NAM et al., and U.S. Provisional Patent Application No. 62 / 710,486 for “VIRTUAL SEARCH SPACES FOR BEAM INDICATION” filed February 16, 2018, in the name of NAM et al., each of which is assigned to the assignee hereof and herein incorporated by reference in its entirety for all purposes. BACKGROUND

[0004] The following relates generally to wireless communications, and more specifically to virtual search space sets for beam indication.

[0005] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems can be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple- access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which can be referred to as New Radio (NR) systems. These systems can employ technologies 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 multiple-access communications system can include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which can be otherwise known as user equipment (UE).

[0006] A base station can transmit control transmissions (e.g., downlink control information (DCI)) to a UE via a physical downlink control channel (PDCCH). The UE can be configured to monitor PDCCHs within search space sets, which can include multiple search candidates. For example, each search space set can be associated with one or more control resource sets (coresets) containing multiple control channel elements (CCEs). The UE can be configured to monitor one or more search candidates in a search space set and can blindly decode one or more CCEs of a search candidate to receive control information.

[0007] SUMMARY

[0008] The described techniques relate to improved methods, systems, devices, or apparatuses that support virtual search space sets for beam indication. In some wireless communications systems, a base station can configure and provide a search space configuration. The base station can transmit control information to a user equipment (UE) in the configured search space set. The search space set can be associated with one or more control resource sets (coresets) containing multiple control channel elements (CCEs). The base station can transmit control information in search candidates (e.g., physical downlink control channel (PDCCH) candidates) on different aggregation levels within the coreset. In some cases, the base station can additionally transmit an indication of the search space configuration to the UE. The UE can monitor a channel (e.g., a PDCCH) carrying downlink control information (DCI) from the base station according to the search space configuration.

[0009] A UE can detect and decode DCI within a search candidate in a search space set. In some cases, the UE can receive transmissions from a base station according to search space configuration and scheduling information. The DCI can include scheduling information, e.g., resource allocation for a downlink data transmission (e.g., on a physical downlink shared channel (PDSCH)) to be transmitted (and received at the UE) from the base station. In some cases, the UE can receive a PDCCH on a first beam during a first transmission time interval (TTI) and a PDSCH on the same beam during a second TTI based on the search space configuration and scheduling information. In some cases, the UE can identify that certain criteria have not been met (e.g., a time offset from the PDCCH to the PDSCH is less than a threshold number of TTIs) and use a default configured beam, which can be a second beam different from the first beam. The search space configuration used by the UE can be a virtual search space set or a normal search space set. The number of PSCCHs actually transmitted can be zero for the virtual search space set and / or the normal search space set. In some cases, the virtual search space set can additionally or alternatively have indicated (e.g., by configuration indication) a number of candidate PDCCHs of zero. As such, the UE can refrain from performing (e.g., by not performing) blind decoding during a TTI associated with the virtual search space set. The UE can also use indicated coreset (e.g., time and frequency resources) associated with the virtual search space set as coreset / time and frequency resources for receiving the PDSCH.

[0010] A method of wireless communication is described. The method can include receiving, from a base station, configuration information for a control channel search space set in a first TTI, the received configuration information including an indication that there is no PDCCH transmission in the control channel search space set and a set of time and frequency resources for the control channel search space set, identifying time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication that there is no PDCCH transmission in the control channel search space set, and receiving the PDSCH transmission in the second TTI using the identified time and frequency resources.

[0011] An apparatus for wireless communication is described. The apparatus can include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the apparatus to receive, from a base station, configuration information for a control channel search space set in a first TTI, the received configuration information including an indication of an absence of PDCCH transmissions in the control channel search space set and a set of time and frequency resources for the control channel search space set, identify time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication of the absence of PDCCH transmissions in the control channel search space set, and receive a PDSCH transmission in the second TTI using the identified time and frequency resources.

[0012] Another apparatus for wireless communication is described. The apparatus can include means for receiving, from a base station, configuration information for a control channel search space set in a first TTI, the received configuration information including an indication of an absence of PDCCH transmissions in the control channel search space set and a set of time and frequency resources for the control channel search space set, identifying time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication of the absence of PDCCH transmissions in the control channel search space set, and receiving a PDSCH transmission in the second TTI using the identified time and frequency resources.

[0013] A non-transitory computer-readable medium storing code for wireless communication is described. The code can include instructions executable by a processor to receive, from a base station, configuration information for a control channel search space set in a first TTI, the received configuration information including an indication of an absence of PDCCH transmissions in the control channel search space set and a set of time and frequency resources for the control channel search space set, identify time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication of the absence of PDCCH transmissions in the control channel search space set, and receive a PDSCH transmission in the second TTI using the identified time and frequency resources.

[0014] Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein can further include operations, features, means, or instructions for refraining from performing blind decoding in the control channel search space set based on receiving the indication of the absence of the PDCCH transmission.

[0015] In some examples of the method, apparatuses, and non-transitory computer- readable medium described herein, the configuration information for the control channel search space set can be received in radio resource control signaling.

[0016] In some examples of the method, apparatuses, and non-transitory computer- readable medium described herein, the configuration information includes a control resource set configuration from the base station, a transmission configuration indication (TCI) state, and time and frequency resources corresponding to resources of the control resource set configuration.

[0017] Some examples of the method, apparatuses, and non-transitory computer- readable medium described herein can further include operations, features, means, or instructions for receiving a transmission configuration indication (TCI) state in a field of the DCI, where the TCI state includes a spatial quasi co-location (QCL) parameter for beam indication.

[0018] Some examples of the method, apparatuses, and non-transitory computer- readable medium described herein can further include operations, features, means, or instructions for receiving a transmission configuration indication (TCI) state in a field of the DCI, and receiving the PDSCH transmission in the identified time and frequency resources using a beam associated with the received TCI state based on a scheduling offset of the PDSCH transmission being greater than or equal to a threshold value.

[0019] Some examples of the method, apparatuses, and non-transitory computer- readable medium described herein can further include operations, features, means, or instructions for receiving a first transmission configuration indication (TCI) state in a field of the DCI, and receiving the PDSCH transmission in the identified time and frequency resources using a first beam associated with a second TCI state based on a scheduling offset of the PDSCH transmission being less than or equal to a threshold value, the first beam being different from a second beam associated with the first TCI state, and a second TCI state of the control resource set being associated with the control channel search space set.

[0020] In some examples of the method, apparatuses, and non-transitory computer- readable medium described herein, the control channel search space set associated with the control resource set includes zero PDCCH candidates.

[0021] A method of wireless communication is described. The method can include identifying time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI, transmitting, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI being prior to the first TTI, and the configuration information including an indication of an absence of a PDCCH transmission to be sent in the control channel search space set to indicate the identified time and frequency resources for the PDSCH and a set of time and frequency resources for the control channel search space set, and transmitting a PDSCH transmission in the first TTI using the identified time and frequency resources for the PDSCH.

[0022] An apparatus for wireless communication is described. The apparatus can include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the apparatus to identify time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI, transmit, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI being prior to the first TTI, and the configuration information including an indication of an absence of a PDCCH transmission to be sent in the control channel search space set to indicate the identified time and frequency resources for the PDSCH and a set of time and frequency resources for the control channel search space set, and transmit a PDSCH transmission in the first TTI using the identified time and frequency resources for the PDSCH.

[0023] Another apparatus for wireless communication is described. The apparatus can include means for identifying time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI, transmitting, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI being prior to the first TTI, and the configuration information including an indication of an absence of a PDCCH transmission to be sent in the control channel search space set to indicate the identified time and frequency resources for the PDSCH and a set of time and frequency resources for the control channel search space set, and transmitting a PDSCH transmission in the first TTI using the identified time and frequency resources for the PDSCH.

[0024] A non-transitory computer-readable medium storing code for wireless communication is described. The code can include instructions executable by a processor to identify time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI, transmit, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI being prior to the first TTI, and the configuration information including an indication of an absence of a PDCCH transmission to be sent in the control channel search space set to indicate the identified time and frequency resources for the PDSCH and a set of time and frequency resources for the control channel search space set, and transmit, in the first TTI, a PDSCH transmission using the identified time and frequency resources for the PDSCH.

[0025] Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein can further include operations, features, means, or instructions for transmitting, using radio resource control signaling, configuration information for the control channel search space set.

[0026] In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration information includes a control resource set configuration, a transmission configuration indication (TCI) state, and time and frequency resources corresponding to resources of the control resource set configuration.

[0027] Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein can further include operations, features, means, or instructions for transmitting, in a field of the DCI, a transmission configuration indication (TCI) state, where the TCI state includes a spatial quasi co-location (QCL) parameter for beam indication.

[0028] Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein can further include operations, features, means, or instructions for transmitting, in a field of the DCI, a transmission configuration indication (TCI) state, and transmitting, in the identified time and frequency resources, a PDSCH transmission using a beam associated with the transmitted TCI state based on a scheduling offset of the PDSCH transmission being greater than or equal to a threshold value.

[0029] Some examples of the method, device, and non-transitory computer-readable medium described herein can further include operations, features, means, or instructions for transmitting a first transmission configuration indication (TCI) state in a field of the DCI, and transmitting the PDSCH transmission in the identified time and frequency resources using a first beam associated with a second TCI state based on a scheduling offset of the PDSCH transmission being less than or equal to a threshold, the first beam being different from a second beam associated with the first TCI state, and the second TCI state of the control resource set being associated with the control channel search space set.

[0030] In some examples of the method, device, and non-transitory computer-readable medium described herein, the control channel search space set associated with the control resource set includes a number of zero PDCCH candidates. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 2 An example of a wireless communications system that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated.

[0032] Figure 3 An example of a process flow that supports configuration of virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated.

[0033] Figure 4 An example of a process flow that supports configuration of virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated.

[0034] Figures 5 to 7 A block diagram of a device that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is shown.

[0035] Figure 8 A block diagram of a system including a UE that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated.

[0036] Figures 9 to 11 A block diagram of a device that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is shown.

[0037] Figure 12 A block diagram of a system including a base station that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated.

[0038] Figures 13 to 19 A method for virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated. DETAILED DESCRIPTION

[0039] ​A base station can transmit control information to a user equipment (UE) within a configured search space set. A search space set can include one or more control resource sets (coresets) that include multiple control channel elements (CCEs). The base station can transmit control information in search candidates (e.g., physical downlink control channel (PDCCH) candidates) on different aggregation levels within the coreset. In some cases, the base station can additionally transmit an indication of the search space configuration to the UE. The UE can monitor a channel (e.g., a PDCCH) for downlink control information (DCI) from the base station according to the search space configuration.

[0040] A UE can detect and decode control information within a search candidate. In some cases, the UE can receive a transmission from a base station according to a search space configuration. The DCI can include scheduling and resource allocation for a downlink data transmission (e.g., on a physical downlink shared channel (PDSCH)) to be transmitted from the base station (and received at the UE). In some cases, the UE can receive a PDCCH on a first beam during a first transmission time interval (TTI) and a PDSCH on a second beam during a second TTI based on the search space configuration. The search space configuration can be associated with a virtual search space set (corresponding to zero PDCCH candidates configured to be in the search space set) or a normal search space set (corresponding to one or more PDCCH candidates configured to be in the search space set).

[0041] Aspects of the disclosure are initially described in the context of a wireless communications system. Aspects of the disclosure are further illustrated in the context of configuration and process flows. Aspects of the disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts related to virtual search space sets for beam indication.

[0042] Figure 1 An example of a wireless communications system 100 that supports virtual search space sets for beam indication in accordance with various aspects of the present disclosure is illustrated. The wireless communications system 100 includes base stations 105, UEs 115, and a core network 130. In some examples, the wireless communications system 100 can be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some cases, wireless communications system 100 can support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, or communications with low-cost and low-complexity devices.

[0043] The base stations 105 can wirelessly communicate with the UEs 115 via one or more base station antennas. The base stations 105 described herein can include or can be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation NodeB or giga-NodeB (either of which can be referred to as a gNB), a Home NodeB, or a Home eNodeB, among other possibilities. The wireless communications system 100 can include base stations 105 of different types (e.g., macro or small cell base stations). The UEs 115 described herein can be able to communicate with various types of base stations 105 and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.

[0044] Each base station 105 can be associated with a particular geographic coverage area 110 in which communication with various UEs 115 is supported. Each base station 105 can provide communication coverage for a respective geographic coverage area 110 via communication links 125 and communication links 125 between a base station 105 and a UE 115 can utilize one or more carriers. Communication links 125 shown in wireless communications system 100 can include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Downlink transmissions can also be called forward link transmissions while uplink transmissions can also be called reverse link transmissions.

[0045] The geographic coverage area 110 for a base station 105 can be divided into sectors making up only a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations of these. In some examples, a base station 105 can be movable and therefore provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or by different base stations 105. The wireless communications system 100 can include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0046] The term “cell” refers to a logical communication entity used for communication with a base station 105 (e.g., on a carrier) and can be associated with an identifier for distinguishing between cells of the same or different carriers (e.g., physical cell identifier (PCID), virtual cell identifier (VCID)). In some examples, a carrier can support a number of cells, and different cells can be configured according to different protocol types (e.g., machine type communication (MTC), narrowband internet of things (NB-IoT), enhanced mobile broadband (eMBB), or other) that can provide access for different types of devices to a wireless communication network. In some cases, the term “cell” can refer to a portion of a geographic coverage area 110 (e.g., a sector) over which a logical entity operates.

[0047] The UEs 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. A UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” can also be referred to as a unit, a station, a terminal, or a client. A UE 115 can also be a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, among other examples, which can be implemented in various articles such as electric meters, vending machines, automobiles, or appliances, among other examples.

[0048] Some UEs 115, such as MTC or IoT devices, can be low cost or low complexity devices, and can provide for automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with one another or a base station 105 without the need for human intervention. In some examples, M2M communication or MTC can include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of that information or present that information to humans in interaction with the programs or applications. Some UEs 115 can be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management, remote security sensing, physical access control, and transaction-based business charging.

[0049] Some UEs 115 can be configured to operate in reduced power consumption modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication can be performed at a reduced peak rate. Other power-saving techniques for UE 115 include entering a power-saving “deep sleep” mode when not engaged in active communication, or operating on limited bandwidth (e.g., according to narrowband communication). In some cases, UE 115 can be designed to support critical functions (e.g., mission-critical functions), and the wireless communication system 100 can be configured to provide ultra-reliable communication for these functions.

[0050] In some scenarios, UE 115 may also be able to communicate directly with other UE 115s (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs in a group of UEs 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UEs 115s in this group may be outside the geographic coverage area 110 of base station 105 or otherwise unable to receive transmissions from base station 105. In some scenarios, groups of UEs 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some scenarios, base station 105 facilitates the scheduling of resources for D2D communication. In other scenarios, D2D communication is performed between UEs 115 without involving base station 105.

[0051] Each base station 105 can communicate with the core network 130 and with each other. For example, base station 105 can interface with the core network 130 via backhaul link 132 (e.g., via S1 or other interfaces). Base stations 105 can communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130) on backhaul link 134 (e.g., via X2 or other interfaces).

[0052] The core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 can be an evolved packet core (EPC), which can include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one Packet Data Network (PDN) gateway (P-GW). The MME can manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets can be transferred through the S-GW, which can be connected to the P-GW. The P-GW can provide IP address allocation as well as other functions. The P-GW can be connected to the network operators IP services. The operators IP services can include the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched (PS) streaming service.

[0053] At least some of the network devices, such as a base station 105, can include subcomponents such as an access network entity, which can be an example of an access node controller (ANC). Each access network entity can communicate with UEs 115 through a number of other access network transmission entities, which can be referred to as a radio head, a smart radio head, or a transmission / reception point (TRP). In some configurations, various functions of each access network entity or base station 105 can be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105).

[0054] The wireless communications system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length. UHF waves can be blocked or redirected by buildings and environmental features. However, the waves can penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

[0055] The wireless communications system 100 can also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band. The SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) band, which can be used opportunistically by devices capable of tolerating interference from other users.

[0056] The wireless communications system 100 can also operate in an extremely high frequency (EHF) region using frequencies that fall in the range of 30 GHz to 300 GHz, also known as the millimeter wave (mmW) region. In some examples, wireless communications system 100 can support mmW communications between UEs 115 and base stations 105, and EHF antennas of the respective devices can be even smaller and more closely spaced than UHF antennas. In some cases, this can facilitate using antenna arrays within a UE 115. However, the propagation of EHF transmissions can be subject to even more atmospheric attenuation and shorter range than SHF or UHF transmissions. Techniques disclosed herein can be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions can differ from country to country. In some examples, wireless communications system 100 can be a

[0057] In some cases, the wireless communications system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system 100 can employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band such as the 5 GHz ISM band. When operating in unlicensed frequency

[0058] In some examples, base station 105 or 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. For example, wireless communications system 100 can use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115), where the transmitting device is equipped with multiple antennas and the receiving devices are equipped with one or more antennas. MIMO communications can employ multipath signal propagation to increase the spectral efficiency of uplink transmissions by leveraging a spatial domain to support spatial multiplexing, beamforming, or transmit diversity. The MIMO communications can be used for transmitting data or control information intended for a single UE 115 or multiple UEs 115. On the uplink, MIMO transmissions can be used for transmitting data or control information intended for a single base station 105 or multiple base stations 105.

[0059] 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., a base station 105 or a UE 115) to shape or steer a beam of energy in a specific direction, such as to the receiving device. Beamforming can be achieved by combining the signals communicated by antennas of an antenna array in a way that causes signals to add constructively and causes other signals to add destructively. This can be achieved by the transmitting device or receiving device applying certain amplitude and phase offsets to signals carried by each of the antennas. The adjustments associated with each of the antennas can be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation).

[0060] In one example, a base station 105 can use multiple antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) can be transmitted by a base station 105 multiple times in different directions, which can include a signal being transmitted according to different beamforming weight sets associated with different directions. Transmissions in different beam directions can be used to identify (e.g., by the base station 105 or a receiving device, such as a UE 115) a beam direction for subsequent transmission and / or reception by the base station 105. Some signals, such as data signals associated with a particular receiving device, can be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115). In some examples, the beam direction associated with transmissions in a single beam direction can be determined based at least in part on a signal that was transmitted in different beam directions. For example, a UE 115 can receive one or more of the signals transmitted by the base station 105 in different directions, and the UE 115 can report to the base station 105 an indication of the signal it received with a highest signal quality, or other acceptable signal quality. Although these techniques are described with reference to signals transmitted in one or more directions by the base station 105, a UE 115 can employ similar techniques for transmitting signals in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115), or for transmitting a signal in a single direction (e.g., for communicating data to a receiving device).

[0061] A receiving device (e.g., a UE 115, which can be an example of a mmW receiving device) can try multiple receive beams when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device can try multiple receive directions by

[0062] In some cases, antennas of a base station 105 or a UE 115 can be located within one or more antenna arrays that can support MIMO operations 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 cases, antennas or antenna arrays associated with a base station 105 can be located in different geographic locations. A base station 105 can have an antenna array with a number of rows and columns of antenna ports that the base station 105 can use for beamforming in support of communication with a UE 115. Likewise, a UE 115 can have one or more antenna arrays that can support various MIMO or beamforming operations.

[0063] In some cases, the wireless communication system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP -based. A Radio Link Control (RLC) layer can in some cases perform packet segmentation and reassembly to communicate over logical channels. A Medium Access Control (MAC) layer can perform priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or core network 130 supporting radio bearers for user plane data. At the physical (PHY) layer, transport channels can be mapped to physical channels.

[0064] In some cases, UEs 115 and base stations 105 can support retransmissions of data to increase the likelihood that data is received successfully. HARQ feedback is one technique of increasing the likelihood that data is received successfully. HARQ can include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer in poor radio

[0065] Time intervals in LTE or NR can be expressed in multiples of a basic time unit, which may, for example, be the sampling period T s = 1 / 30,720,000 seconds of a Basic Time Unit (BTU). Time intervals of a communications resource can be expressed in multiples of a Basic Frame Period (BFP), which can be equal to T f = 307,200 Ts A radio frame can be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame can include 10 subframes numbered from 0 to 9, and each subframe can have a duration of 1 ms. A subframe can be further divided into 2 slots, each having a duration of 0.5 ms, and each slot can contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). Excluding the cyclic prefix, each symbol period can contain 2048 sample periods. In some cases, a subframe can be the smallest scheduling unit of the wireless communications system 100, and can be referred to as a transmission time interval (TTI). In other cases, a smallest scheduling unit of the wireless communications system 100 can be shorter than a subframe or can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs) or in selected component carriers using sTTIs).

[0066] In some wireless communications systems, a slot can be further divided into multiple mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot can be the smallest scheduling unit. For example, each symbol can vary in duration depending on the subcarrier spacing or the operating band. Further, some wireless communications systems can implement slot aggregation, where multiple slots or mini-slots are aggregated together and used for communications between a UE 115 and a base station 105.

[0067] The term “carrier” refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communications over the communication links 125. For example, a carrier of the communication links 125 can include a portion of a radio frequency spectrum band that operates according to physical layer channels for a given radio access technology. Each physical layer channel can carry user data, control information, or other signaling. A carrier can be associated with a pre-defined frequency channel (e.g., an E-UTRA absolute radio frequency channel number (EARFCN)) and can be positioned relative to other carriers according to a channel raster for discovery by UEs 115. A carrier can be a downlink or uplink (e.g., in FDD mode) or be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, signal waveforms transmitted over a carrier can be made up of multiple sub-carriers (e.g., using multi-carrier modulation (MCM) techniques such as OFDM or DFT-s-OFDM).

[0068] The organizational structure for a carrier can be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR, etc.). For example, communications over a carrier can be organized according to TTIs or slots, each of which can include user data as well as control information or signaling to support decoding the user data. A carrier can also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling that coordinates operation among carriers. In some examples (e.g., in carrier aggregation configurations), a carrier can also have acquisition signaling or control signaling that coordinates operations for other carriers.

[0069] Physical channels can be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel can be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, control information transmitted in a physical control channel can be distributed across different control regions between (e.g., between a common control region or common search space set and one or more UE-specific control regions or UE-specific search space sets).

[0070] A carrier can be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth can be referred to as a “system bandwidth” of the carrier or wireless communications system 100. For example, the carrier bandwidth can be one of a number of predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 can be configured for operating over portions or all of the carrier bandwidth. In other examples, some UEs 115 can be configured for operation using a narrowband protocol type associated with a predefined portion or range (e.g., set of subcarriers or RBs) within a carrier (e.g., “in-band” deployment of the narrowband protocol type).

[0071] In systems employing MCM techniques, a resource element can consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and 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). Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rates for the UE 115. In MIMO systems, a wireless communications resource can refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers), and the use of multiple spatial layers can further increase the data rates for communications with a UE 115.

[0072] Devices of the wireless communications system 100 (e.g., base stations 105 or UEs 115) can have a hardware configuration that supports communications over a particular carrier bandwidth, or can be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system 100 can include base stations 105 and / or UEs that can support simultaneous communications via carriers associated with more than one different carrier bandwidth.

[0073] Wireless communications system 100 can support communications between UEs 115 and base stations 105 on multiple cells or carriers, a feature which can be referred to as carrier aggregation (CA) or multi-carrier operation. A UE 115 can be configured with multiple downlink CCs and one or more uplink CCs depending on a carrier aggregation configuration. Carrier aggregation can be used with both FDD and TDD component carriers. In some cases, wireless communications system 100 can utilize enhanced component carriers (eCCs). An eCC can be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration. In some cases, eCCs can be associated with carrier aggregation or dual connectivity configurations (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). eCCs can also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC that is characterized by a wide carrier bandwidth can include one or more segments that can be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power).

[0074] In some cases, an eCC can utilize a different symbol duration than other CCs, which can include use of a reduced symbol duration as compared with symbol durations of the other CCs. A shorter symbol duration can be associated with increased spacing between adjacent subcarriers. A device, such as a UE 115 or base station 105, utilizing eCCs can transmit wideband signals based on frequency carriers aggregated together such that the combined signal occupies a larger bandwidth. In some cases, two or more eCCs can be aggregated together to form an eCC with a carrier bandwidth of 20, 40, 60, 80, or 100 MHz (e.g., as compared with a 1, 5, 10, 15, or 20 MHz carrier bandwidth of 1CC).

[0075] Wireless communications systems such as NR systems can utilize any combination of licensed, shared, and unlicensed spectrum bands, among others. The flexibility of eCC symbol duration and subcarrier spacing can allow for the use of eCCs across multiple frequency spectrums. In some examples, NR shared spectrum can increase spectrum utilization and spectral efficiency, particularly by allowing dynamic vertical (e.g., across frequency) and horizontal (e.g., across time) sharing of resources.

[0076] The base station 105 can identify frequency resources for a PDSCH to be transmitted to the UE 115 in a first TTI. In some cases, the base station 105 can transmit, to the UE 115, configuration information for a control channel search space set in a second TTI. The second TTI can precede the first TTI. The configuration information can include an indication of an absence of a PDCCH transmission to be sent in the control channel search space set to indicate the identified frequency resources for the PDSCH, and a set of frequency resources for the control channel search space set. In some cases, the base station 105 can transmit the configuration information for the control channel search space set using RRC signaling. The configuration information can include a coreset configuration, or an identified time resource, an identified frequency resource, or both, corresponding to resources of the coreset configuration, or both. The UE 115 can receive the configuration information for the control channel search space set in the first TTI, and identify the frequency resources allocated for the PDSCH in the second TTI based at least in part on the set of time and / or frequency resources for the control channel search space set in the first TTI and the indication of the absence of the PDCCH transmission to be sent in the control channel search space set. The UE 115 can refrain from performing blind decoding in the control channel search space set based on receiving the indication of the absence of the PDCCH transmission (e.g., an indication that the number of PDCCH candidates is zero). In some cases, the base station 105 can transmit a transmission configuration indication (TCI) state in a field of DCI. The TCI state includes a spatial quasi co-location (QCL) parameter that the UE 115 can receive for beam indication.

[0077] The base station 105 can transmit (and the UE 115 can receive) a PDSCH transmission in the first TTI using the identified frequency resources for the PDSCH. In some cases, based at least in part on a scheduling offset of the PDSCH transmission being greater than, or greater than or equal to, a threshold, the base station 105 can transmit (and the UE 115 can receive) the PDSCH transmission in the first TTI using a beam corresponding to the identified frequency resources. Alternatively, based at least in part on the scheduling offset of the PDSCH transmission being less than, or less than or equal to, the threshold, the base station 105 can transmit (and the UE 115 can receive) the PDSCH transmission in the first TTI using a first beam. The first beam is different from a second beam corresponding to the identified frequency resources.

[0078] Figure 2 An example of a wireless communications system 200 that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated. In some examples, wireless communications system 200 can implement aspects of wireless communications system 100. Wireless communications system 200 can include base stations 205 and UEs 215, which can be examples of the corresponding devices described with reference to FIG. 1. Wireless communications system 200 can be an example of a 5G NR network. Figure 1Examples of corresponding devices are described. Wireless communications system 200 can also operate according to a radio access technology (RAT), such as a Fifth Generation (5G) New Radio (NR) RAT, although the techniques described herein can be applied to any RAT and can be used concurrently with systems supporting two or more different RATs that support beamformed transmissions. Some examples of wireless communications system 200 can support one or more virtual search space sets to reduce overhead and reduce unnecessary blind decodes of physical channels (e.g., PDCCH).

[0079] Base station 205 can perform RRC procedures (e.g., cell acquisition procedures, random access procedures, RRC connection procedures, RRC configuration procedures) with UE 215. Base station 205 can be configured with multiple antennas that can be used for directional transmissions or beamformed transmissions (e.g., beamformed communication beams 220-a through 220-g). In some examples, the RRC procedures can include a beam sweep procedure. As Figure 2 As illustrated in FIG. 2, base station 205 can transmit a number of beamformed communication beams 220-a through 220-g in different directions within a coverage area.

[0080] As part of the RRC procedures, base station 205 and UE 215 can synchronize before base station 205 schedules and allocates resources (e.g., time and frequency resources) for the UE 115. Base station 205 can transmit one or more synchronization signals associated with a carrier bandwidth used for synchronization. The synchronization signals can include, for example, a primary synchronization signal and a secondary synchronization signal. To determine a suitable communication beam 220 for communications, base station 205 can transmit the one or more synchronization signals in one or more transmissions 225 according to a beam sweep pattern. In some cases, UE 215 can be time synchronized with base station 205 and can be able to receive the one or more transmissions 225 during a slot, TTI, shortened-TTI (s-TTI), subframe, or frame, etc.

[0081] Base station 205 can schedule and allocate resources to UE 215 for transmissions 225 via beamformed transmissions (e.g., beamformed communication beams 220-a). For example, base station 205 can schedule and allocate resources for downlink transmissions of control information. Base station 205 can configure, in some cases, a coreset and a search space set for transmitting control information (e.g., DCI) to UE 215 on a PDCCH. A search space set can refer to a coreset, which can be identified based on an identifier of the coreset (e.g., coreset-ID). A search space set can refer to any resources (e.g., time and frequency resources, such as groups of resource elements, resource element groups, etc.) used to transmit control information within a given slot (e.g., TTI, s-TTI).

[0082] A slot can be a portion of a resource grid that can correspond to a system bandwidth that the base station 205 can allocate to a UE 215, which can last indefinitely in time in some cases. Information can be organized using the resource grid according to frequency and time. A resource element in the resource grid can span one symbol by one subcarrier. Each resource element can carry two, four, or six physical channel bits. Resource elements can be grouped into resource blocks (RBs), which can span a certain frequency range, e.g., a frequency range of 180 kHz (e.g., 12 subcarriers). The base station 205 can allocate RBs to a UE 215 by allocating the symbols and subcarriers within each slot to the UE 215 in units of corresponding RBs. Each slot can span a number of symbol periods (e.g., 14 modulation symbol periods) (e.g., OFDM symbols) and a number of subcarriers within a bandwidth.

[0083] A coreset can span multiple RBs in the frequency domain and can span a number of modulation symbol periods in the time domain. A coreset can be divided into a number of CCEs and can support a number of different aggregation levels for transmission of control information. Each aggregation level can correspond to a number of CCEs allocated for a PDCCH candidate. For example, an aggregation level of 4 can indicate that the base station 205 transmits control information for the aggregation level in coresets having a multiple of 4 CCEs. Such control information contained within a segment of 4 CCEs can be referred to as a search candidate or a PDCCH decoding candidate. In some cases, multiple coresets can be configured for a slot. The base station 205 can transmit DCI within search space sets in search candidates (e.g., PDCCH decoding candidates) of different aggregation levels. The UE 215 can monitor the search space sets for search candidates (e.g., PDCCH decoding candidates) and can perform blind decoding of PDCCH candidates during which the UE 215 can perform multiple decoding attempts in the search space sets until DCI is detected. In some examples, DCI carried on the PDCCH can include scheduling and allocation of resources (e.g., time and frequency resources) for PDSCH transmissions.

[0084] The UE 215 can be preconfigured with search space configuration information. In some cases, the base station 205 can transmit configuration information associated with a search space set to the UE 215. The configuration information can include RRC parameters indicated to the UE 215 via higher layer signaling (e.g., RRC signaling). The RRC parameters can include an indication of whether a TCI is present in DCI. In some examples, the base station 205 can configure the UE 215 with multiple TCI states for QCL indication (e.g., including spatial QCL parameters for beam indication). For example, if the RRC parameter TCI-PresentInDCI is set to “enabled” for a coreset scheduling a PDSCH transmission, the UE 215 can assume that a TCI field is always present in the DCI of a PDCCH transmitted on that coreset. Alternatively, if the parameter TCI-PresentInDCI is set to “disabled” for a coreset scheduling a PDSCH, the UE 215 can assume that the TCI state for the PDSCH is the same as the TCI state applied to the coreset for PDCCH transmission.

[0085] In such cases, if the parameter TCI-PresentinDCI is set to “enabled,” the UE 215 can use a TCI state according to a value of a TCI field detected in a PDCCH with DCI to select a directional beam or a beamformed beam (e.g., a beamformed communication beam 220-a through 220-g) for PDSCH reception. In some examples, for both cases where TCI-PresentInDCI is “enabled” and TCI-PresentInDCI is “disabled,” the UE 215 can use a directional beam or a beamformed beam based on a TCI state used for PDCCH QCL indication of a lowest coreset ID in a latest slot where one or more coresets are configured for the UE 215 if a scheduling offset k0 is less than a threshold. Alternatively, the UE 215 can use a directional beam or a beamformed beam given by a TCI state indicated in DCI for a PDSCH if an offset k0 between receiving the DCI and the corresponding PDSCH is equal to or greater than the threshold. However, for some PDSCH transmissions without a scheduling PDCCH (e.g., in semi-persistent scheduling), a default directional beam or a beamformed beam from a recent coreset can be ineffective (e.g., when a search space set monitoring periodicity is very large (a periodicity greater than a configured threshold)). However, having the base station 205 configure multiple search space sets with small periodicity (e.g., a periodicity less than a configured threshold) for default beam indication can unnecessarily increase an overhead of PDCCH blind decoding for the UE 215.

[0086] The base station 205 can configure a virtual search space set for the UE 215. The wireless communications system 200 can support zero PDCCH candidates at least for the virtual search space set configuration. The virtual search space set can be a type of search space set that is defined and used for PDSCH beam indication. In some cases, the wireless communications system 200 can configure separate sets of search space sets. For example, a first set can include a number of virtual search space sets, while a second set can include a number of normal search space sets. The number of normal search space sets per bandwidth part (BWP) can be limited to constrain the blind decoding overhead of the UE. However, the virtual search space sets configured by the base station 205 can not increase the blind decoding overhead of the UE 215, and the number of virtual search space sets can be much larger than the number of normal search space sets.

[0087] A virtual search space set as described herein can refer to a search space set that has no PDCCH candidates (e.g., has been indicated to not include any PDCCH candidates). Thus, if the UE 215 is configured with a virtual search space set, the UE 215 can not expect a PDCCH transmission within that search space set, and thus can refrain from performing blind decoding in the virtual search space set. Since there is no actual PDCCH transmission, the time / frequency resources associated with the virtual search space set can be reused for other transmissions, such as PDSCH and / or reference signals. In some cases, the base station 205 can reuse an existing search space set configuration to configure a virtual search space set. For example, the base station 205 can reconfigure an existing search space set configuration by setting the number of PDCCH candidates (nrofCandidates) to zero for some or all aggregation levels. Additionally, the base station 205 can not use some existing search space set configuration parameters to configure the virtual search space set.

[0088] The base station 205 can configure or reconfigure RRC parameters to indicate a virtual search space set configuration. For example, the base station 205 can use a TCI state for PDCCH QCL indication that includes a lowest indexed coreset, among a number of coresets, that has a latest modulation symbol period (e.g., OFDM symbol) configured for the UE 215 (e.g., a virtual or normal search space set). As such, the UE 215 can use the TCI state of the coreset with the latest OFDM symbol, rather than applying the TCI state of the coreset with the latest slot. In some cases, a directional beam or beamformed beam for a PDSCH can use a default TCI state when a scheduling offset k0(e.g., in TTI or slots) is less than a threshold offset (e.g., a threshold number of TTIs or slots) (e.g., with TCI-PresentInDCI “enabled” and with TCI-PresentInDCI “disabled”). In some cases, the base station 205 can schedule the PDSCH according to a semi-persistent scheduling.

[0089] Figure 3 An example of a configuration 300 that supports virtual search space sets for beam indication in accordance with various aspects of the present disclosure is illustrated. In some examples, the configuration 300 can implement aspects of the wireless communications systems 100 and 200. In some examples, the configuration 300 can support semi-persistent scheduling with beam indication.

[0090] The configuration 300 can illustrate portions of a resource grid. Referring to Figure 2 , the resource grid can correspond to a system bandwidth 305 that a base station 205 can allocate to a UE 215, and the resource grid can last for a number of symbol periods in time. Information can be organized into a resource grid according to frequency and time. Each resource element can span one symbol period by one subcarrier. Each resource element can carry two, four, or six physical channel bits depending on the modulation coding scheme (MCS) (e.g., quadrature phase shift keying (QPSK), 16-quadrature amplitude modulation (QAM), 64-QAM, etc.). The base station 205 can group resource elements into resource blocks (RBs), each of which can span across a frequency range of 180 kHz (e.g., 12 subcarriers). In addition, the base station 205 can allocate RBs to a UE 215 by assigning to the UE 215 a number of resource elements within a symbol period and a subcarrier in each time slot (e.g., time slots 310-a through 310-g) in units of RBs. Each time slot 310-a through 310-g can span 14 modulation symbol periods and a number of subcarriers within the system bandwidth 305.

[0091] Some examples of wireless communications systems (e.g., fourth generation (4G) Long Term Evolution (LTE)) can configure periodicity of semi-persistently scheduled PDSCH with RRC. In some cases, base station 205 can also transmit PDCCH with a semi-persistent scheduling cell-radio network temporary identifier (SPS-C-RNTI) to allocate resources and trigger semi-persistently scheduled PDSCH transmissions.

[0092] UE 215 can receive semi-persistently scheduled PDSCH 325 in slot 310-c. The first semi-persistently scheduled PDSCH 325 in slot 310-c can follow similar rules and procedures as normal PDSCH. The second semi-persistently scheduled PDSCH 325 in slot 310-e and so on can use a default beam as long as there is no PDCCH overriding the resources of the semi-persistently scheduled PDSCH 325. If there is a PDCCH overriding the resources, the same rules and procedures as normal PDSCH apply to the PDCCH. The rules can be based on TCI-PresentInDCI indication, scheduling offset k0, and a threshold.

[0093] Coreset 315 in slot 310-a can carry PDCCH 320 with SPS-C-RNTI. PDCCH 320 with SPS-C-RNTI can carry DCI that provides scheduling information for the corresponding semi-persistently scheduled PDSCH 325. When TCI-PresentInDCI is “enabled,” the DCI can include a field indicating a TCI state. The TCI state can include spatial QCL parameters for beam indication. In some cases, with scheduling offset k0 greater than or equal to a threshold, the TCI state included in the DCI of PDCCH 320 in slot 310-a can indicate the beam indication for semi-persistently scheduled PDSCH 325 in slot 310-c. When TCI-PresentInDCI is “disabled,” and with scheduling offset k0 greater than or equal to a threshold, the same TCI state applied to coreset 315 in slot 310-a can be assumed as the TCI state for semi-persistently scheduled PDSCH 325 in slot 310-c.

[0094] In the example of slot 310-b, which is the latest slot before the PDSCH 325 in slot 310-c for which the UE 215 is configured with one or more coreset(s), there can be two coreset(s) 315. In this case, the UE 215 can select the beam indication for the semi-persistently scheduled PDSCH 325 in slot 310-c based on the indication of the TCI state applied to the coreset closest to the PDSCH 325 (in this case, the coreset of the middle portion of slot 310-b) and based on whether the scheduling offset is less than the threshold.

[0095] In slot 310-d, which is the latest slot before the semi-persistently scheduled PDSCH 325 in slot 310-e for which the UE 215 is configured with one or more coreset(s), the coreset 315 configured for the UE 215 can not include any PDCCH, and the beam for the PDSCH 325 in slot 310-e can be indicated based on the indication of the TCI state applied to the coreset. The base station 205 can configure a virtual search space set for the UE 215 in which no PDCCH 320 is configured to be transmitted in the virtual search space set. The base station 205 can generate configuration information that can be used for a control channel search space set in slot 310-f. The base station 205 can transmit the configuration information to the UE 215 via RRC signaling. The configuration information can include an RRC parameter that can indicate that there is no or a lack of PDCCH transmission to be transmitted in the control channel search space set (e.g., by indicating a number of candidate PDCCHs 320 of 0). In some cases, the configured coreset 330 can be a portion of slot 310-f. The configured coreset 330 can contain the virtual search space set. The virtual search space set can indicate the beam indication for receiving the semi-persistently scheduled PDSCH 325 during slot 310-g based on the indication of the TCI state applied to the configured coreset 330. Based on receiving the configuration information from the base station 205, the UE 215 can refrain from performing blind decoding on the configured coreset 330 because of the indication based on the virtual search space configuration that there is no or a lack of PDCCH transmission during slot 310-f. The UE 215 can receive the semi-persistently scheduled PDSCH 325 during slot 310-g using the beam corresponding to the beam indication for the virtual search space set. The UE 215 can also refrain from performing blind decoding in the virtual search space set of slot 310-f.

[0096] Figure 4 An example of a process flow 400 that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is illustrated. In some examples, process flow 400 can implement aspects of wireless communications systems 100 and 200. Base station 405 and UE 415 can be examples of the corresponding devices described with reference to Figure 1 and 2 FIGS. 1-3.

[0097] In the following description of the process flow 400, the operations between base station 405 and UE 415 can be transmitted in a different order than the exemplary order shown, or the operations performed by base station 405 and UE 415 can be performed in different orders or at different times. Certain operations can also be left out of the process flow 400, or other operations can be added to the process flow 400.

[0098] In some examples, the process flow can begin with base station 405 establishing a connection with UE 415 (e.g., performing a cell acquisition procedure, a random access procedure, an RRC connection procedure, an RRC configuration procedure, etc.).

[0099] At 420, base station 405 can identify resources to be used for transmitting to UE 415 using a PDSCH. For example, base station 405 can identify frequency and time resources for a PDSCH to be transmitted to the UE in a first TTI. Base station 405 can identify resources for UE 415 based on a semi-persistent scheduling. UE 415 can have previously been provided configuration information for semi-persistent scheduling by base station 405, e.g., as part of control information transmitted on a PDCCH.

[0100] In some examples, base station 405 can communicate with UE 415 and can send control transmissions (such as DCI) via a PDCCH. In some examples, control information (such as DCI) can be included in a coreset. The DCI can schedule and allocate resources for a PDSCH. The UE 415 can be configured to monitor PDCCHs within search space sets, which can include multiple search candidates. In some cases, a search candidate can be a control channel candidate or a PDCCH candidate. In yet other cases, each search space set can include multiple CCEs and can include one or more search candidates, where each search candidate can include one or more CCEs. UE 415 can be configured to monitor one or more search candidates in a search space set and can blindly decode the one or more CCEs of the search candidates to receive control information.

[0101] However, for some PDSCHs that do not have a scheduling PDCCH (e.g., in the case of semi-persistent scheduling of PDSCH), the default directional beam or beamformed beam from the recent coreset can be outdated (e.g., when the search space set monitoring periodicity is very large, and the UE 415 can have moved, or the channel conditions with respect to the beam can have degraded over time). However, the case where the base station 405 configures multiple search space sets with small periodicity for default beam indication can unnecessarily increase the overhead of PDCCH blind decodes for the UE 415. The base station 405 can configure a virtual search space set for the UE 415, where no PDCCH is configured to be transmitted in the virtual search space set. As such, the UE 415 can refrain from blind decoding in the virtual search space set. The base station 405 can configure or reconfigure an RRC parameter to indicate the virtual search space configuration to the UE 415.

[0102] At 425, the base station 405 can generate configuration information. In some cases, the configuration information can include a coreset configuration, identified frequency resources corresponding to resources of the coreset configuration. For example, the base station 405 can generate configuration information that can be used for a control channel search space set in a second TTI. The second TTI can be prior to the first TTI. The configuration information can include an indication of an absence or lack of PDCCH transmissions to be transmitted in the control channel search space set (e.g., by indicating a number of PDCCHs of 0) to indicate the identified frequency resources for PDSCH, and a set of frequency resources for the control channel search space set. In some cases, the control channel search space set associated with the coreset contains zero PDCCH candidates.

[0103] At 430, the base station 405 can transmit the configuration information to the UE 415. In some cases, the base station 405 can use RRC signaling to transmit the configuration information for the control channel search space set.

[0104] At 435, the UE 415 can receive the configuration information from the base station 405. At 440, the UE 415 can identify resources allocated for PDSCH. For example, the UE 415 can identify frequency and time resources allocated for PDSCH in a second TTI based on a set of frequency resources for a control channel search space set in a first TTI and an indication of an absence of PDCCH transmissions in the control channel search space set. In some cases, the UE 415 can refrain from performing blind decoding in the control channel search space set based on receiving the indication of the absence of PDCCH transmissions.

[0105] At 445, base station 405 can transmit PDSCH to UE 415. UE 415 can use the identified frequency resource to receive PDSCH transmission in the second TTI. In some examples, UE 415 can use the beam corresponding to the identified frequency resource to receive PDSCH transmission in the second TTI, at least in part, based on a scheduling offset of PDSCH transmission greater than or equal to a threshold. Alternatively, UE 415 can use a first beam to receive PDSCH transmission in the second TTI based on a scheduling offset of PDSCH transmission less than or equal to a threshold. The first beam may be different from the second beam corresponding to the identified frequency resource.

[0106] Figure 5 A block diagram 500 of a wireless device 505 supporting a virtual search space set for beam indication is shown according to various aspects of this disclosure. Wireless device 505 may be an example of various aspects of UE 115 as described herein. Wireless device 505 may include a receiver 510, a UE communication manager 515, and a transmitter 520. Wireless device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0107] Receiver 510 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to a virtual search space set used for beam indication). The receiver can pass information to other components of the device. Receiver 510 can be a reference... Figure 8 Examples of various aspects of the transceiver 835 are described. The receiver 510 may utilize a single antenna or an array of antennas.

[0108] UE Communication Manager 515 can be used as a reference Figure 8 Examples of various aspects of the described UE communication manager 815. At least some of the UE communication manager 815 and / or its various sub-components may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functionality of at least some of the UE communication manager 815 and / or its various sub-components may be performed by a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0109] The UE communications manager 515 and / or at least some of its various sub- components can be physically located in different locations, including being distributed so that portions of functions are implemented at different physical locations by one or more physical devices. In some examples, according to various aspects of the disclosure, the UE communications manager 515 and / or at least some of its various sub-components can be a separate and distinct component in accordance with various aspects of the present disclosure. In other examples, according to various aspects of the disclosure, the UE communications manager 515 and / or at least some of its various sub-components can be combined with one or more other hardware components, including but not limited to an I / O component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof. In some examples, the UE communications manager 515 and / or at least some of its various sub-components can be a software component stored in and executed by the memory 515 to perform various communication-related functions recited in the present disclosure.

[0110] The UE communications manager 515 can receive configuration information for a control channel search space set in a first TTI, the received configuration information including an indication that there is no PDCCH transmission in the control channel search space set and a set of time and frequency resources for the control channel search space set, identify a set of time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication that there is no PDCCH transmission in the control channel search space set, and receive a PDSCH transmission in the second TTI using the identified set of time and frequency resources.

[0111] The transmitter 520 can transmit signals generated by other components of the device. In some examples, the transmitter 520 can be collocated with a receiver 510 in a transceiver module. For example, the transmitter 520 can be an example of aspects of the transceiver 835 described with reference to FIG. 8. The transmitter 520 can utilize a single antenna or a set of antennas. Figure 8

[0112] Figure 6 A block diagram 600 of a wireless device 605 that supports virtual search space set for beam indication in accordance with aspects of the present disclosure is shown. The wireless device 605 can be an example of aspects of a wireless device 505 or a UE 115 as described with reference to FIG. 5. The wireless device 605 can include a receiver 610, a UE communications manager 615, and a transmitter 620. The wireless device 605 can also include a processor. Each of these components can be in communication with one another (e.g., via one or more buses). Figure 5

[0113] The receiver 610 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to virtual search space set for beam indication, etc.). Information can be passed on to other components of the device. The receiver 610 can be a receiver as described with reference to FIG. 5. Figure 8 ​​Examples of aspects of the described transceiver 835. The receiver 610 can utilize a single antenna or a set of antennas.

[0114] The UE communications manager 615 can be an example of aspects of the described UE communications manager 815. The UE communications manager 615 can also include a configuration component 625, a resource component 630, and a physical channel component 635. Figure 8 Examples of aspects of the described UE communications manager 815. The UE communications manager 615 can also include a configuration component 625, a resource component 630, and a physical channel component 635.

[0115] The configuration component 625 can receive configuration information for a control channel search space set in a first TTI. The received configuration information includes an indication of an absence of PDCCH transmissions in the control channel search space set and a set of frequency resources for the control channel search space set. In some cases, the configuration information for the control channel search space set is received in radio resource control signaling. In some cases, the configuration information includes a coreset configuration from a base station, a TCI state, and time and frequency resources corresponding to resources of the coreset configuration. In some cases, the control channel search space set associated with the coreset contains zero PDCCH candidates.

[0116] The resource component 630 can identify time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication of the absence of PDCCH transmissions in the control channel search space set.

[0117] The physical channel component 635 can receive a first TCI state in a field of the DCI and can receive the PDSCH transmission in the identified time and frequency resources. The physical channel component 635 can receive the PDSCH transmission in the identified time and frequency resources using a first beam associated with the received TCI state. The identified time and frequency resources can be based on a scheduling offset of the PDSCH transmission being greater than or equal to a threshold. In some other cases, the physical channel component 635 can receive the PDSCH transmission in the identified time and frequency resources using a first beam associated with a second TCI state based on a scheduling offset of the PDSCH transmission being less than or equal to a threshold, where the first beam can be different from a second beam associated with the first TCI state, and the second TCI state of the control resource set is associated with the control channel search space set.

[0118] The transmitter 620 can transmit signals generated by other components of the device. In some examples, the transmitter 620 can be collocated with a receiver 610 in a transceiver module. For example, the transmitter 620 can be a transmitter Figure 8 Examples of aspects of the described transceiver 835. The receiver 610 can utilize a single antenna or a set of antennas.

[0119] Figure 7 A block diagram 700 of a UE communications manager 715 that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is shown. The UE communications manager 715 can be an example of aspects of the UE communications manager 515, UE communications manager 615, or UE communications manager 815 described with reference to Figure 5 、 6 and 8. The UE communications manager 715 can include a configuration component 720, a resource component 725, a physical channel component 730, a decoding component 735, and a parameter component 740. Each of these modules can communicate, directly or indirectly, with one another (e.g., via one or more buses).

[0120] The configuration component 720 can receive configuration information for a control channel search space set in a first TTI. The received configuration information includes an indication of an absence of PDCCH transmissions in the control channel search space set and a set of time and frequency resources for the control channel search space set. In some cases, the configuration information for the control channel search space set is received in radio resource control signaling. In some cases, the configuration information includes a coreset configuration from a base station, a TCI state, and time and frequency resources corresponding to resources of the coreset configuration. In some cases, the control channel search space set associated with the coreset contains zero PDCCH candidates.

[0121] The resource component 725 can identify a set of time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication of the absence of PDCCH transmissions in the control channel search space set.

[0122] The physical channel component 730 can receive a first TCI state in a field of DCI and can receive a PDSCH transmission in the identified time and frequency resources. The physical channel component 730 can receive the PDSCH transmission in the identified time and frequency resources using a beam associated with the received TCI state. The identified time and frequency resources can be based on a scheduling offset of the PDSCH transmission being greater than or equal to a threshold. In some other cases, the physical channel component 730 can receive the PDSCH transmission in the identified time and frequency resources using a first beam associated with a second TCI state based on a scheduling offset of the PDSCH transmission being less than or equal to a threshold, where the first beam can be different from a second beam corresponding to the associated first TCI state.

[0123] The decoding component 735 can refrain from performing blind decoding in the control channel search space set based on receiving the indication of the absence of the PDCCH transmission. The parameter component 740 can receive a TCI state in a field of the DCI, where the TCI state includes spatial QCL parameters for beam indication.

[0124] Figure 8 A diagram illustrating a system 800 including a device 805 that supports virtual search space set for beam indication in accordance with aspects of the present disclosure is shown. The device 805 can be an example of or include the components of wireless device 505, wireless device 605, or a UE 115 as described above, e.g., with reference to Figure 5 and Figure 6 The device 805 can include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a UE communications manager 815, a processor 820, memory 825, software 830, a transceiver 835, an antenna 840, and an I / O controller 845. These components can be in electronic communication via one or more buses (e.g., bus 810). The device 805 can communicate wirelessly with one or more base stations 105.

[0125] The processor 820 can include an intelligent hardware device, (e.g., a general- purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 820 can be configured to operate a memory array using a memory controller. In other cases, a memory controller can be integrated into the processor 820. The processor 820 can be configured to execute computer-readable instructions stored in a memory to perform various

[0126] The memory 825 can include random access memory (RAM) and read only memory (ROM). The memory 825 can store computer-readable, computer-executable software 830 including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 825 can contain, among other computer-readable software 830, a basic input / output system (BIOS), which can control basic hardware or software operation such as the interaction with peripheral components or devices.

[0127] Software 830 can include code to implement aspects of the present disclosure, including code to support virtual search space sets for beam indication. Software 830 can be stored in a non-transitory computer-readable medium such as system memory or other memory. In some cases, the software 830 can not be directly executable by the processor but can cause a computer (e.g., when compiled and executed) to perform functions described herein.

[0128] Transceiver 835 can communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, transceiver 835 can represent a wireless transceiver and can communicate bi-directionally with another wireless transceiver. The transceiver 835 can also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas. In some cases, the wireless device can include a single antenna 840. However, in some cases the device can have more than one antenna 840, which can be capable of concurrently transmitting or receiving multiple wireless transmissions.

[0129] I / O controller 845 can manage input and output signals for device 805. I / O controller 845 can also manage peripherals not integrated into device 805. In some cases, I / O controller 845 can represent a physical connection or port to or another known operating system. In other cases, I / O controller 845 can represent a modem, a keyboard, a mouse, a touchscreen, or similar device, or interaction with such devices. In some cases, I / O controller 845 can be implemented as part of a processor. In some cases, a user can interact with device 805 via I / O controller 845 or via hardware components controlled by I / O controller 845.

[0130] Figure 9 A block diagram 900 of a wireless device 905 that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is shown. The wireless device 905 can be an example of aspects of a base station 105 as described herein. The wireless device 905 can include a receiver 910, a base station communications manager 915, and a transmitter 920. The wireless device 905 can also include a processor. Each of these components can be in communication with one another (e.g., via one or more buses).

[0131] The receiver 910 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to virtual search space sets for beam indication, etc.). Information can be passed on to other components of the device. The receiver 910 can be a receiver as described with reference to FIG. 7. The transmitter 920 can transmit information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to virtual search space sets for beam indication, etc.). The transmitter 920 can be a transmitter as described with reference to FIG. 7. The base station communications manager 915 can manage communications with other base stations 105 and / or core network 130 (see FIG. 1). The base station communications manager 915 can manage one or more aspects of virtual search space sets for beam indication as described herein. Figure 12Examples of various aspects of the transceiver 1235 are described. The receiver 910 may utilize a single antenna or an array of antennas.

[0132] Base Station Communication Manager 915 can be used as a reference Figure 12 Examples of various aspects of the described base station communication manager 1215. At least some of the base station communication manager 915 and / or its various sub-components may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functionality of at least some of the base station communication manager 915 and / or its various sub-components may be performed by a general-purpose 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 in this disclosure.

[0133] At least some of the sub-components of the base station communication manager 915 and / or its various sub-components may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical devices at different physical locations. In some examples, according to various aspects of this disclosure, at least some of the sub-components of the base station communication manager 915 and / or its various sub-components may be separate and distinct components. In other examples, according to various aspects of this disclosure, at least some of the sub-components of the base station communication manager 915 and / or its various sub-components may be combined with one or more other hardware components (including, but not limited to, I / O components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof).

[0134] The base station communication manager 915 can identify the time and frequency resources for PDSCH to be transmitted to the UE in a first TTI, transmit configuration information for a control channel search space set in a second TTI prior to the first TTI, and the configuration information includes: an indication that there is no PDCCH transmission to be transmitted in the control channel search space set, indicating the identified time and frequency resources for the PDSCH, and the time and frequency resource set for the control channel search space set; and using the identified time and frequency resources for the PDSCH to transmit the PDSCH transmission in the first TTI.

[0135] Transmitter 920 can transmit signals generated by other components of the device. In some examples, transmitter 920 may coexist with receiver 910 in a transceiver module. For example, transmitter 920 may be a reference... Figure 12 Examples of various aspects of the transceiver 1235 are described. The transmitter 920 may utilize a single antenna or an array of antennas.

[0136] Figure 10A block diagram 1000 of a wireless device 1005 that supports virtual search space sets for beam indication in accordance with aspects of the present disclosure is shown. The wireless device 1005 can be a example of aspects of the wireless device 905 or base station 105 described with reference to Figure 9 The wireless device 1005 can include a receiver 1010, a base station communications manager 1015, and a transmitter 1020. The wireless device 1005 can also include a processor. Each of these components can be in communication with one another (e.g., via one or more buses).

[0137] The receiver 1010 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to virtual search space sets for beam indication, etc.). Information can be passed on to other components of the device. The receiver 1010 can utilize a single antenna or a set of antennas. Figure 12 The receiver 1010 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to virtual search space sets for beam indication, etc.). Information can be passed on to other components of the device. The receiver 1010 can utilize a single antenna or a set of antennas.

[0138] The base station communications manager 1015 can be an example of aspects of the base station communications manager 1215 described with reference to Figure 12 The base station communications manager 1015 can be an example of aspects of the base station communications manager 1215 described with reference to

[0139] The configuration component 1030 can transmit, to a UE, configuration information for a control channel search space set in a second TTI. The second TTI is prior to the first TTI, and the configuration information includes an indication of an absence of a PDCCH transmission to be transmitted in the control channel search space set to indicate the identified time and frequency resources for the PDSCH, and a set of time and frequency resources for the control channel search space set. The configuration component 1030 can transmit the configuration information for the control channel search space set using radio resource control signaling. In some cases, the configuration information includes a coreset configuration, a TCI state, and time and frequency resources corresponding to resources of the coreset configuration. In some cases, the control channel search space set associated with the coreset contains zero PDCCH candidates.

[0140] The physical channel component 1035 can transmit the PDSCH transmission with a first TCI state in a field of the DCI. The physical channel component 1035 can transmit the PDSCH transmission in the identified time and frequency resources using a beam associated with the transmitted TCI state, the PDSCH transmission being based on a scheduling offset greater than or equal to a threshold. In other cases, the physical channel component 1035 can transmit the PDSCH transmission in the identified time and frequency resources using a first beam associated with a second TCI state and based on a scheduling offset of the PDSCH transmission being less than or equal to a threshold. The first beam can be different from a second beam associated with the first TCI state, and the second TCI state of the control resource set is associated with the control channel search space set.

[0141] The transmitter 1020 can transmit signals generated by other components of the device. In some examples, the transmitter 1020 can be collocated with a receiver 1010 in a transceiver module. For example, the transmitter 1020 can be an example of aspects of the transceiver 1235 described with reference to FIG. 12. The transmitter 1020 can utilize a single antenna or a set of antennas. Figure 12

[0142] Figure 11 A block diagram 1100 of a base station communications manager 1115 that supports virtual search space set for beam indication in accordance with aspects of the present disclosure is shown. The base station communications manager 1115 can be an example of aspects of the base station communications manager 1215 described with reference to FIGs. 12. Figure 9 10 The base station communications manager 1115 can include a resource component 1120, a configuration component 1125, a physical channel component 1130, and a parameter component 1135. Each of these modules can communicate, directly or indirectly, with one another (e.g., via one or more buses).

[0143] The resource component 1120 can identify time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI. The configuration component 1125 can transmit, to the UE, configuration information for a control channel search space set in a second TTI. The second TTI is prior to the first TTI, and the configuration information includes an indication of an absence of a PDCCH transmission to be transmitted in the control channel search space set to indicate the identified time and frequency resources for the PDSCH, and a set of time and frequency resources for the control channel search space set. The configuration component 1125 can transmit the configuration information for the control channel search space set using RRC signaling. In some cases, the configuration information includes a coreset configuration, a TCI state, and time and frequency resources corresponding to resources of the coreset configuration. In some cases, the control channel search space set associated with the coreset contains zero PDCCH candidates. ​​

[0144] Physical channel component 1130 can transmit PDSCH transmissions using a first TCI state in a field of the DCI. Physical channel component 1130 can use a beam associated with the transmitted TCI state to transmit PDSCH transmissions in identified time and frequency resources, the transmission of which is based on a scheduling offset greater than or equal to a threshold. In other cases, physical channel component 1130 can use a first beam associated with a second TCI state and transmit the PDSCH transmission in identified time and frequency resources based on a scheduling offset of less than or equal to a threshold. The first beam may be different from the second beam associated with the first TCI state, and the second TCI state of the control resource set is associated with the control channel search space set. Parameter component 1135 can transmit TCI states in a field of the DCI. The TCI state may include spatial QCL parameters for beam indication.

[0145] Figure 12 A diagram is shown of a system 1200 including a device 1205 supporting a virtual search space set for beam indication, according to various aspects of this disclosure. Device 1205 may be as described above (e.g., refer to...). Figure 1 The device 1205 may include, or be an example of, the components of the base station 105 described herein. The device 1205 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a base station communication manager 1215, a processor 1220, a memory 1225, software 1230, a transceiver 1235, an antenna 1240, a network communication manager 1245, and an inter-station communication manager 1250. These components may be in electronic communication via one or more buses (e.g., bus 1210). The device 1205 may wirelessly communicate with one or more UEs 115.

[0146] Processor 1220 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 cases, processor 1220 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1220. Processor 1220 may be configured to execute computer-readable instructions stored in memory to perform various functions (e.g., supporting various functions or tasks for a virtual search space set used for beam indication).

[0147] Memory 1225 can include RAM and ROM. The memory 1225 can store computer-readable, computer-executable software 1230 including instructions that, when executed, cause the processor to perform various functions described herein. In some

[0148] The software 1230 can include code to implement aspects of the present disclosure, including code to support virtual search space sets for beam indication. The software 1230 can be stored in a non-transitory computer-readable medium such as system memory or other memory. In some examples, the software 1230 can not be directly executable by the processor but can cause a computer (e.g., when compiled and executed) to perform functions described herein.

[0149] The transceiver 1235 can communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 1235 can represent a wireless transceiver and can communicate bi-directionally with another wireless transceiver. The transceiver 1235 can also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas. In some cases, the wireless device can include a single antenna 1240. However, in some cases the device can have more than one antenna 1240, which can be capable of concurrently transmitting or receiving multiple wireless transmissions.

[0150] The network communications manager 1245 can manage communications with the core network (e.g., via one or more wired backhaul links). For example, the network

[0151] The inter-station communications manager 1250 can manage communications with other base station 105, and can include a controller or scheduler to coordinate or schedule communications with UEs 115 via other base stations 105. For example, the inter-station communications manager 1250 can coordinate scheduling of transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager 1250 can provide an X2 interface within a Long Term Evolution (LTE) / LTE-A wireless communication network technology to provide communication between base stations 105.

[0152] Figure 13 A method 1300 for virtual search space sets for beam indication, in accordance with aspects of the present disclosure, is illustrated. The operations of method 1300 can be implemented by a UE 115 or its components as described herein. For example, the operations of method 1300 can be performed by a UE 115 as described with reference to FIGs. 1-2. Figures 5 to 8The described UE communications manager performs. In some examples, the UE 115 can execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 can perform aspects the functions described below using special-purpose hardware.

[0153] At 1305, the UE 115 can receive configuration information for a control channel search space set in a first TTI, the received configuration information including an indication that there is no PDCCH transmission in the control channel search space set and a set of time and frequency resources for the control channel search space set. The operations of 1305 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1305 can be performed by a configuration component as described with reference to Figures 5 to 8

[0154] At 1310, the UE 115 can identify a set of time and frequency resources allocated for a PDSCH in a second TTI based at least in part on the set of time and frequency resources for the control channel search space set in the first TTI and the indication that there is no PDCCH transmission in the control channel search space set. The operations of 1310 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1310 can be performed by a resource component as described with reference to Figures 5 to 8

[0155] At 1315, the UE 115 can receive the PDSCH transmission in the second TTI using the identified set of time and frequency resources. The operations of 1315 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1315 can be performed by a physical channel component as described with reference to Figures 5 to 8

[0156] Figure 14 A method 1400 for a virtual search space set for beam indication is shown and described. The operations of method 1400 can be implemented by a UE 115 or its components as described herein. For example, the operations of method 1400 can be performed by a UE communications manager as described with reference to Figures 5 to 8 The described UE communications manager performs. In some examples, the UE 115 can execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 can perform aspects the functions described below using special-purpose hardware.

[0157] ​​​At 1405, the UE 115 can receive configuration information for a control channel search space set in a first TTI, the received configuration information including an indication that there are no PDCCH transmissions in the control channel search space set and a set of time and frequency resources for the control channel search space set. The operations of 1405 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1405 can be performed by a configuration component as described with reference to Figures 5 to 8

[0158] At 1410, the UE 115 can identify a set of time and frequency resources allocated for a PDSCH in a second TTI based at least in part on the set of time and frequency resources for the control channel search space set in the first TTI and the indication that there are no PDCCH transmissions in the control channel search space set. The operations of 1410 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1410 can be performed by a resource component as described with reference to Figures 5 to 8

[0159] At 1415, the UE 115 can receive the PDSCH transmission in the second TTI using the identified set of time and frequency resources. The operations of 1415 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1315 can be performed by a physical channel component as described with reference to Figures 5 to 8

[0160] At 1420, the UE 115 can refrain from performing blind decoding in the control channel search space set based at least in part on receiving the indication that there are no PDCCH transmissions. The operations of 1420 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1420 can be performed by a decoding component as described with reference to Figures 5 to 8

[0161] Figure 15 A method 1500 for a virtual search space set for beam indication is shown illustrating a flowchart of a method 1500 for a virtual search space set for beam indication in accordance with aspects of the present disclosure. Operations of method 1500 can be implemented by a UE 115 or its components as described herein. For example, the operations of method 1500 can be performed by a UE communications manager as described with reference to Figures 5 to 8

[0162] ​​​​​At 1505, the UE 115 can receive configuration information for a control channel search space set in a first TTI, the received configuration information including an indication that there is no PDCCH transmission in the control channel search space set and a set of time and frequency resources for the control channel search space set. The operations of 1505 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1505 can be performed by a configuration component as described with reference to Figures 5 to 8

[0163] At 1510, the UE 115 can identify a set of time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication that there is no PDCCH transmission in the control channel search space set. The operations of 1510 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1510 can be performed by a resource component as described with reference to Figures 5 to 8

[0164] At 1515, the UE 115 can receive a TCI state in a field of the DCI. The operations of 1515 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1515 can be performed by a physical channel component as described with reference to Figures 5 to 8

[0165] At 1520, the UE 115 can receive the PDSCH transmission in the identified set of time and frequency resources using a beam associated with the received TCI state based on the scheduling offset of the PDSCH transmission being greater than or equal to a threshold value. The operations of 1520 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1520 can be performed by a physical channel component as described with reference to Figure 16

[0166] Figures 5 to 8 A method 1600 for a virtual search space set for beam indication is shown illustrating a flowchart of the method 1600 in accordance with aspects of the present disclosure. Operations of the method 1600 can be implemented by a UE 115 or its components as described herein. For example, the operations of the method 1600 can be performed by a UE communications manager as described with reference to Figures 5 to 8

[0167] ​​​​​At 1605, the UE 115 can receive configuration information for a control channel search space set in a first TTI, the received configuration information including an indication that there is no PDCCH transmission in the control channel search space set and a set of time and frequency resources for the control channel search space set. The operations of 1605 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1605 can be performed by a configuration component as described with reference to Figures 5 to 8

[0168] At 1610, the UE 115 can identify a set of time and frequency resources allocated for a PDSCH in a second TTI based on the set of time and frequency resources for the control channel search space set in the first TTI and the indication that there is no PDCCH transmission in the control channel search space set. The operations of 1610 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1610 can be performed by a resource component as described with reference to Figures 5 to 8

[0169] At 1615, the UE 115 can receive a TCI state in a field of the DCI. The operations of 1615 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1615 can be performed by a physical channel component as described with reference to Figure 17

[0170] At 1620, the UE 115 can receive the PDSCH transmission in the identified set of time and frequency resources using a first beam associated with the second TCI state based on the scheduling offset of the PDSCH transmission being less than or equal to a threshold value, where the first beam is different from a second beam associated with the first TCI state, and the second TCI state of the control resource set is associated with the control channel search space set. The operations of 1620 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1620 can be performed by a physical channel component as described with reference to Figures 9 to 12

[0171] Figures 9 to 12 A method 1700 for virtual search space set for beam indication is shown illustrating a flowchart of the method 1700 in accordance with aspects of the present disclosure. Operations of the method 1700 can be implemented by a base station 105 or its components as described herein. For example, the operations of the method 1700 can be performed by the base station communications manager as described with reference to Figures 9 to 12 In some examples, a base station 105 can execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the base station 105 can perform aspects of the functions described below using special-purpose hardware.

[0172] ​​​​At 1705, the base station 105 can identify time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI. The operations of 1605 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1605 can be performed by a resource component as described with reference to Figures 9 to 12 FIG. 16.

[0173] At 1710, the base station 105 can transmit, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI preceding the first TTI, and the configuration information including an indication of an absence of a PDCCH transmission to be transmitted in the control channel search space set to indicate the identified time and frequency resources for the PDSCH and a set of time and frequency resources for the control channel search space set. The operations of 1710 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1710 can be performed by a configuration component as described with reference to Figure 18 FIG. 17.

[0174] At 1715, the base station 105 can transmit the PDSCH transmission in the first TTI using the identified time and frequency resources for the PDSCH. The operations of 1715 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1715 can be performed by a physical channel component as described with reference to Figures 9 to 12 FIG. 17.

[0175] Figures 9 to 12 A method 1800 for a virtual search space set for beam indication is shown and described with reference to FIG. 18. The operations of method 1800 can be implemented by a base station 105 or its components as described herein. For example, the operations of method 1800 can be performed by a base station communications manager as described with reference to Figures 9 to 12 FIG. 18. In some examples, a base station 105 can execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the base station 105 can perform aspects of the functions described below using special-purpose hardware.

[0176] At 1805, the base station 105 can identify time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI. The operations of 1805 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1805 can be performed by a resource component as described with reference to Figures 9 to 12 FIG. 18.

[0177] At 1810, the base station 105 can transmit, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI preceding the first TTI, and the configuration information including: an indication of an absence of a PDCCH transmission to be transmitted in the control channel search space set to indicate the identified time and frequency resources for the PDSCH, and a set of time and frequency resources for the control channel search space set. The operations of 1810 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1810 can be performed by a configuration component as described with reference to Figures 9 to 12 FIG. 19.

[0178] At 1815, the base station 105 can transmit a TCI state in a field of the DCI. The operations of 1815 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1815 can be performed by a physical channel component as described with reference to Figure 19 FIG. 19.

[0179] At 1820, the base station 105 can transmit, based on a scheduling offset of the PDSCH transmission being greater than or equal to a threshold, the PDSCH transmission in the identified time and frequency resources using a beam associated with the transmitted TCI state. The operations of 1820 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1820 can be performed by a physical channel component as described with reference to Figures 9 to 12 FIG. 19.

[0180] Figures 9 to 12 A flow diagram illustrating a method 1900 for a virtual search space set for beam indication in accordance with aspects of the present disclosure is shown. The operations of method 1900 can be implemented by a base station 105 or its components as described herein. For example, the operations of method 1900 can be performed by a base station communications manager as described with reference to Figures 9 to 12 FIG. 19. In some examples, a base station 105 can execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the base station 105 can perform aspects of the functions described below using special-purpose hardware.

[0181] At 1905, the base station 105 can identify time and frequency resources for a PDSCH to be transmitted to a UE in a first TTI. The operations of 1905 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1905 can be performed by a resource component as described with reference to Figures 9 to 12 FIG. 19.

[0182] At 1910, the base station 105 can transmit, to the UE, configuration information for a control channel search space set in a second TTI, the second TTI preceding the first TTI, and the configuration information including: an indication of an absence of a PDCCH transmission to be transmitted in the control channel search space set to indicate the identified time and frequency resources for the PDSCH, and a set of time and frequency resources for the control channel search space set. The operations of 1910 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1810 can be performed by a configuration component as described with reference to Figures 9 to 12

[0183] At 1915, the base station 105 can transmit the TCI state in a field of the DCI. The operations of 1915 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1915 can be performed by a physical channel component as described with reference to ​

[0184] At 1920, the base station 105 can transmit the PDSCH transmission in the identified time and frequency resources using a first beam associated with a second TCI state based on a scheduling offset of the PDSCH transmission being less than or equal to a threshold, the first beam being different from a second beam associated with the first TCI state, and the second TCI state of the control resource set being associated with the control channel search space set. The operations of 1920 can be performed according to the methods described herein. In certain examples, aspects of the operations of 1920 can be performed by a physical channel component as described with reference to ​

[0185] implementations, and that the operations and steps can be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods can be combined.

[0186] ​​​The techniques described herein can be used for various wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-Carrier Frequency Division Multiple Access (SC-FDMA), and other systems. A CDMA system can implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 Releases can be commonly referred to as CDMA2000 IX, IX, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 lxEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement a radio technology such as Global System for Mobile Communications (GSM).

[0187] An OFDMA system can implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from the organization named “3rd Generation Partnership Project” (3GPP). CDMA2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). The techniques described herein can be used for the systems and radio technologies mentioned above as well as other systems and radio technologies. While aspects of an LTE, LTE-A, LTE-A Pro, or NR system can be described

[0188] Macro cells generally cover relatively large geographic areas (e.g., areas of tens of kilometers in radius) and can allow unrestricted access by UEs 115 with service subscriptions with the network provider. Small cell bases stations 105 can be associated with a lower- powered base station 105 (e.g., compared to a macro cell) and can include micro, pico, or femto cell base stations. Small cell base stations 105 can be deployed indoors to provide home or small business service, or outdoors to provide service in locations that can be difficult to serve by macro base stations. The term "cell" is not limited to a single geographic coverage area, but can refer to a coverage area of a base station 105, or a coverage area of a base station 105 and a base station 105. The coverage area of a base station 105 can be divided into sectors making up only a portion of the coverage area. The term "cell" can refer to the smallest geographical coverage area of a base station 105 and can be used interchangeably with the term "sector."

[0189] One or more wireless communications systems 100 described herein can support synchronous or asynchronous operation. For synchronous operation, the base stations 105 can have similar frame timings, and transmissions from different base stations 105 can be approximately aligned in time. For asynchronous operation, the base stations 105 can have different frame timings, and transmissions from different base stations 105 can not be aligned in time. The techniques described herein can be used for either synchronous or asynchronous operation.

[0190] Information and signals described herein can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0191] The various illustrative blocks and modules described in connection with the disclosure herein can be implemented or performed with 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 herein. A general-purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can 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).

[0192] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions can also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

[0193] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium can be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0194] As used herein, including in the claims “or” as used in a list of items (for example, a list of items prefaced by a phrase such as “at least one of’ or “one or more of’) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, as

[0195] In the drawings, like reference numerals can be used to denote similar components throughout the several views. Additionally, various components of the same type can be distinguished from each other by following the convention of numbering them with the first two digits making up the existing drawing number and the third and fourth digits being the duplicate number particular to the same drawing figure. If, in the specification, only a single reference numeral is

[0196] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that can be implemented or that are within the scope of the claims. The term "exemplary" used herein means "serving as an example, instance, or illustration," and not "preferred" over other examples. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0197] The description herein is presented to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not to be limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and individually or collectively operable to execute the code to cause the device to: receive a first control message comprising an indication of a plurality of resources allocated for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) and an indication of a first transmission configuration indication (TCI) state; receive configuration information for a control channel search space set, the configuration information comprising an indication of an absence of a physical downlink control channel (PDCCH) transmission in the control channel search space set; and receive, based at least in part on an offset of a transmission associated with the SPS PDSCH relative to the first control message being less than or equal to a threshold, the transmission associated with the SPS PDSCH in a resource of the plurality of resources using a beam associated with a second TCI state, wherein the beam associated with the second TCI state is different from a beam associated with the first TCI state, the second TCI state being associated with a control resource set (CORESET) associated with the control channel search space set.

2. The device of claim 1, wherein the one or more processors are further individually or collectively operable to execute the code to cause the device to: determine that the CORESET is a closest CORESET to the resource, wherein the second TCI state is based at least in part on the CORESET being the closest CORESET to the resource.

3. The device of claim 1, wherein the one or more processors are further individually or collectively operable to execute the code to cause the device to: inhibit performing blind decoding in the control channel search space set based at least in part on receiving the indication of the absence of the PDCCH transmission. To receive the configuration information for the control channel search space set, the one or more processors are individually or collectively operable to execute the code to cause the device to:

4. The apparatus of claim 1, wherein, receive the configuration information for the control channel search space set via radio resource control (RRC) signaling. a configuration associated with the CORESET, a set of transmission configuration indication (TCI) states comprising the first TCI state and the second TCI state, or both.

5. The apparatus of claim 1, wherein the configuration information comprises:

6. The device of claim 1, wherein the first TCI state and the second TCI state comprise one or more spatial quasi-co-location (QCL) parameters.

7. The device of claim 1, wherein the one or more processors are further individually or collectively operable to execute the code to cause the device to: apply the second TCI state based at least in part on the CORESET associated with the control channel search space set being associated with a latest slot of a set of slots comprising the CORESET and one or more other CORESETs. ​ 8. The device of claim 1, wherein the CORESET comprises a virtual search space set, the virtual search space set comprising a beam indication for receiving the transmission associated with the SPS PDSCH.

9. The device of claim 1, wherein the one or more processors are further individually or collectively capable of being operable to execute code to cause the device to: receive a second transmission associated with the SPS PDSCH using a beam associated with the first TCI state based at least in part on an offset of the second transmission associated with the SPS PDSCH relative to the first control message being greater than or equal to the threshold.

10. The device of claim 1, wherein the control channel search space set associated with the CORESET comprises zero PDCCH candidates.

11. A method for wireless communication at a user equipment (UE), comprising: receiving a first control message, the first control message comprising an indication of a plurality of resources allocated for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) and an indication of a first transmission configuration indication (TCI) state; receiving configuration information for a control channel search space set, the configuration information comprising an indication that there is no physical downlink control channel (PDCCH) transmission in the control channel search space set; and receiving a transmission associated with the SPS PDSCH in a resource of the plurality of resources using a beam associated with a second TCI state based at least in part on an offset of the transmission associated with the SPS PDSCH relative to the first control message being less than or equal to a threshold, wherein the beam associated with the second TCI state is different from a beam associated with the first TCI state, the second TCI state being associated with a control resource set (CORESET) associated with the control channel search space set.

12. The method of claim 11, further comprising: determining that the CORESET is a closest CORESET to the resource, wherein the second TCI state is based at least in part on the CORESET being the closest CORESET to the resource.

13. The method of claim 11, further comprising: refraining from performing blind decoding in the control channel search space set based at least in part on receiving the indication that there is no PDCCH transmission.

14. The method of claim 11, wherein receiving the configuration information for the control channel search space set comprises: receiving the configuration information for the control channel search space set via radio resource control (RRC) signaling.

15. The method of claim 11, wherein the configuration information comprises: a set of transmission configuration indication (TCI) states comprising at least the first TCI state and the second TCI state associated with the CORESET, or both.

16. The method of claim 11, wherein the first TCI state and the second TCI state comprise one or more spatial quasi co-location (QCL) parameters.

17. The method of claim 11, further comprising: applying the second TCI state based at least in part on the CORESET associated with the control channel search space set being associated with a latest slot of a set of slots comprising the CORESET and one or more other CORESETs.

18. The method of claim 11, wherein the CORESET comprises a virtual search space set, the virtual search space set comprising an indication of a beam for receiving the transmission associated with the SPS PDSCH.

19. A device for wireless communication, comprising: means for receiving a first control message comprising an indication of a plurality of resources allocated for a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH) and an indication of a first transmission configuration indication (TCI) state; means for receiving configuration information for a control channel search space set, the configuration information comprising an indication of an absence of a physical downlink control channel (PDCCH) transmission in the control channel search space set; and means for receiving a transmission associated with the SPS PDSCH in a resource of the plurality of resources using a beam associated with a second TCI state based at least in part on an offset of the transmission associated with the SPS PDSCH relative to the first control message being less than or equal to a threshold, wherein the beam associated with the second TCI state is different from a beam associated with the first TCI state, the second TCI state being associated with a control resource set (CORESET) associated with the control channel search space set.

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