Search space configurations for random access messaging

Abstract

Methods, systems, and devices for wireless communication are described. In some systems, a User Equipment (UE) may perform a Random Access (RACH) procedure based on a selected Synchronized Signal Block (SSB). During this RACH procedure, the base station may transmit Physical Downlink Control Channel (PDCCH) messages to the UE for processing RACH messages. To receive PDCCH signaling for RACH messages 2, 3, or 4 (Msg 2 / 3 / 4), the UE may identify a set of time resources used by the base station to transmit SSBs that are not quasi-colocated (QCL) with the selected SSB. The UE may identify a Msg 2 / 3 / 4 search space that does not overlap with this identified set of resources and may monitor this identified search space. The search space may correspond to a modified Residual Minimum System Information (RMSI) search space indicated by the base station or a valid RMSI search space not identified by the base station.

Description

Technology Field

[0001] Cross-references

[0002] This patent application claims the benefit of U.S. provisional patent application No. 62 / 659,616 filed by Islam et al. on April 18, 2018, with the title of invention "Search Space Configurations for Random Access Messaging", and U.S. patent application No. 16 / 282,614 filed by Islam et al. on February 22, 2019, with the title of invention "Search Space Configurations for Random Access Messaging", each of which is assigned to the assignee of this application.

[0003] Technology field

[0004] The following concerns wireless communication in general, and more specifically, the configuration of search spaces for Random Access (RACH) messaging. Background Technology

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

[0006] In some wireless communication systems, a UE may perform a RACH procedure with a base station to obtain access to a wireless network. This RACH procedure may include the communication of multiple messages between the UE and the base station, including transmissions of RACH message 1 (Msg1), message 2 (Msg2), message 3 (Msg3), and message 4 (Msg4). RACH Msg1 may include a RACH preamble transmission from the UE to the base station, RACH Msg2 may include a Random Access Response (RAR) message transmitted in response, RACH Msg3 may include a Radio Resource Control (RRC) access request transmitted from the UE to the base station, and RACH Msg4 may include a Media Access Control (MAC) control element (CE) for contention resolution transmitted by the base station in response. Each of these RACH messages may be associated with information transmitted by the base station on the downlink (e.g., scheduling grants transmitted as Physical Downlink Control Channel (PDCCH) transmissions). However, the UE may not be able to effectively determine which resources to receive these PDCCH transmissions on without interrupting the reception of other transmissions (e.g., synchronization signaling). means of solving the problem

[0007] The described techniques relate to methods, systems, devices, or apparatus that support search space configurations for Random Access (RACH) messaging. Generally, the described techniques provide a user device (UE) with the ability to maintain the reception of non-quasi-colocated (QCL) transmissions while performing a RACH procedure. The UE may initiate a RACH procedure with a base station based on a selected synchronization signal block (SSB). During this RACH procedure, the base station may transmit Physical Downlink Control Channel (PDCCH) messages to the UE for RACH message processing (e.g., scheduling). To receive PDCCH signaling for RACH messages 2, 3, or 4 (Msg 2 / 3 / 4), the UE may identify a set of time resources used by the base station to transmit the selected SSB and non-QCL SSBs. The UE may identify a Msg 2 / 3 / 4 search space that does not overlap with this identified set of resources, and may monitor the identified search space. In some cases, the Msg 2 / 3 / 4 search space may correspond to a modified remaining minimum system information (RMSI) search space indicated by the base station (modified, e.g., by removing resources that temporally conflict with non-QCL SSBs) or a valid RMSI search space not indicated by the base station (e.g., where the resources in the valid RMSI search space do not temporally conflict with non-QCL SSBs). As a result, the UE may receive a configuration for the Msg 2 / 3 / 4 search space and remove resources from the configured search space that temporally overlaps with non-QCL SSBs. The UE may receive PDCCH transmits and non-QCL SSBs from the base station based on the configuration of the identified search space.

[0008] A method for wireless communications in a UE is described. The method may include the steps of: transmitting a first RACH message to a base station based on an SSB received by a UE on a first receiving beam; identifying a set of time resources used by a base station for transmitting one or more other SSBs from the base station; identifying a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources; and monitoring the PDCCH message in the identified search space.

[0009] An apparatus for wireless communications in a UE is described. The apparatus may include means for transmitting a first RACH message to a base station based on an SSB received by a UE on a first receiving beam; means for identifying a set of time resources used by a base station for transmitting one or more other SSBs from the base station; means for identifying a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources; and means for monitoring a PDCCH message in the identified search space.

[0010] Another device for wireless communications in a UE is described. The device may include a processor, a memory communicating electronically with the processor, and instructions stored in the memory. The instructions may be operable to cause the processor to transmit a first RACH message to a base station based on an SSB received by the UE on a first receiving beam, to identify a set of time resources used by the base station for transmitting one or more other SSBs from the base station, to identify a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources, and to monitor the PDCCH message in the identified search space.

[0011] A non-transient computer-readable medium for wireless communications in a UE is described. The non-transient computer-readable medium may include instructions, the instructions may be operable to cause a processor to transmit a first RACH message to a base station based on an SSB received by the UE on a first receiving beam, to identify a set of time resources used by the base station for transmitting one or more other SSBs from the base station, to identify a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources, and to monitor a PDCCH message in the identified search space.

[0012] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the PDCCH message comprises a PDCCH grant for transmitting a RACH message 2 (Msg2), a PDCCH grant for transmitting a RACH message 3 (Msg3), a PDCCH grant for transmitting a RACH message 4 (Msg4), or a combination thereof.

[0013] In some examples of the method, apparatus, and non-transient computer-readable medium described herein, one or more other SSBs may be received by the UE on receiving beams that may be different from the first receiving beam.

[0014] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or instructions for identifying an RMSI search space corresponding to an SSB and configured through a physical broadcast channel (PBCH) configuration.

[0015] In some examples of the method, apparatus, and non-temporal computer-readable medium described herein, identifying a search space further comprises removing time resources that overlap with a set of identified time resources from an identified RMSI search space, wherein the identified search space includes the remaining time resources of the identified RMSI search space.

[0016] In some examples of the method, apparatus, and non-transient computer-readable medium described herein, removing time resources for an identified RMSI search space comprises changing the slot-level periodicity of the identified RMSI search space, wherein the identified search space includes the same symbol index locations as the identified RMSI search space but has the changed slot-level periodicity of the identified RMSI search space.

[0017] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, identifying a search space further comprises determining to implement a default search space based on RMSI transmission from a base station. Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or instructions for identifying monitoring occupations for monitoring PDCCH messages based on monitoring occupations of the RMSI search space.

[0018] In some examples of the method, apparatus, and non-temporal computer-readable medium described herein, identifying a search space further comprises identifying an RMSI search space having time resources that do not overlap with a set of identified time resources, wherein the identified search space includes an identified RMSI search space.

[0019] Some examples of the method, apparatus, and non-transitive computer-readable medium described herein may further include processes, features, means, or instructions for receiving from a base station a representation of a set of time resources for a search space. Some examples of the method, apparatus, and non-transitive computer-readable medium described herein may further include processes, features, means, or instructions for removing time resources of a set of time resources identified from a represented set of time resources for a search space, wherein the identified search space includes the remaining time resources of a represented set of time resources for a search space.

[0020] In some examples of the methods, apparatus, and non-temporal computer-readable media described herein, the indication of a set of time resources for a search space includes a time window for the search space. In some examples of the methods, apparatus, and non-temporal computer-readable media described herein, a subset of slots of the time window includes an identified search space. In some examples of the methods, apparatus, and non-temporal computer-readable media described herein, a subset of slots includes each slot of the time window.

[0021] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, identifying a search space further comprises identifying the start of a search space based on transmitting a first RACH message and identifying the end of a search space based on a response timer. In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the response timer includes a random access response (RAR) window, a contention resolution timer, or a combination thereof.

[0022] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or commands for receiving an SSB from a base station, and the first RACH message may be transmitted from a RACH OKS corresponding to the SSB.

[0023] Some examples of the method, apparatus, and non-transient computer-readable medium described herein may further include processes, features, means, or instructions for selecting a first receiving beam, and the identified search space may be monitored using the selected first receiving beam during time resources that may be different from the set of identified time resources. Some examples of the method, apparatus, and non-transient computer-readable medium described herein may further include processes, features, means, or instructions for selecting a second receiving beam that is different from the selected first receiving beam. Some examples of the method, apparatus, and non-transient computer-readable medium described herein may further include processes, features, means, or instructions for monitoring at least one of one or more other SSBs using the selected second receiving beam during the set of identified time resources.

[0024] Some examples of the methods, apparatus, and non-temporal computer-readable media described herein may further include processes, features, means, or instructions for receiving at least one of one or more other SSBs from a base station based on time resources for an identified search space that does not overlap with a set of identified time resources.

[0025] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or commands for receiving PDCCH messages in control channel elements (CCEs) of a search space identified based on monitoring.

[0026] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, one or more other SSBs include one or more SSBs actually transmitted by a base station.

[0027] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or commands for receiving from a base station an indication of one or more SSBs actually transmitted by the base station in the form of an RMSI, other system information (OSI), radio resource control (RRC) message, media access control (MAC) control element (CE), handover message, or a combination thereof.

[0028] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the locations of one or more other SSBs may be fixed.

[0029] A method for wireless communications at a base station is described. The method may include the steps of: receiving a first RACH message from a UE based on an SSB received by a UE on a first receiving beam; identifying a set of time resources used for transmitting one or more other SSBs by a base station; identifying a search space for the UE to receive a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources; mapping the PDCCH message to CCEs within the identified search space; and transmitting the PDCCH message to the UE according to the mapping.

[0030] An apparatus for wireless communications at a base station is described. The apparatus may include means for receiving a first RACH message from a UE based on an SSB received by a UE on a first receiving beam; means for identifying a set of time resources used for transmitting one or more other SSBs by a base station; means for identifying a search space for the UE to receive a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources; means for mapping a PDCCH message to CCEs within the identified search space; and means for transmitting a PDCCH message to a UE according to the mapping.

[0031] Another device for wireless communication at a base station is described. The device may include a processor, a memory that communicates electronically with the processor, and instructions stored in the memory. The instructions may be operable to cause the processor to receive a first RACH message from the UE based on an SSB received by the UE on a first receiving beam, to identify a set of time resources used for the transmission of one or more other SSBs by the base station, to identify a search space for the UE to receive a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources, to map the PDCCH message to CCEs within the identified search space, and to transmit the PDCCH message to the UE according to the mapping.

[0032] A non-transient computer-readable medium for wireless communications at a base station is described. The non-transient computer-readable medium may include instructions, the instructions may be operable to cause a processor to receive a first RACH message from a UE based on an SSB received by a UE on a first receiving beam, to identify a set of time resources used for the transmission of one or more other SSBs by a base station, and to identify a search space for the UE to receive a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources, to map a PDCCH message to CCEs within the identified search space, and to transmit a PDCCH message to the UE according to the mapping.

[0033] In some examples of the methods, apparatus, and non-transient computer-readable media described herein, the PDCCH message comprises a PDCCH grant for transmitting RACH Msg2, a PDCCH grant for transmitting RACH Msg3, a PDCCH grant for transmitting RACH Msg4, or a combination thereof.

[0034] In some examples of the method, apparatus, and non-transient computer-readable medium described herein, one or more other SSBs may be received by the UE on receiving beams that may be different from the first receiving beam.

[0035] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or instructions for identifying an RMSI search space corresponding to an SSB and configured through a PBCH configuration.

[0036] In some examples of the method, apparatus, and non-temporal computer-readable medium described herein, identifying a search space further comprises removing time resources that overlap with a set of identified time resources from an identified RMSI search space, wherein the identified search space includes the remaining time resources of the identified RMSI search space.

[0037] In some examples of the method, apparatus, and non-transient computer-readable medium described herein, removing time resources for an identified RMSI search space comprises changing the slot-level periodicity of the identified RMSI search space, wherein the identified search space includes the same symbol index locations as the identified RMSI search space but has the changed slot-level periodicity of the identified RMSI search space.

[0038] In some examples of the method, apparatus, and non-temporal computer-readable medium described herein, identifying a search space further comprises identifying an RMSI search space having time resources that do not overlap with a set of identified time resources, wherein the identified search space includes an identified RMSI search space.

[0039] Some examples of the method, apparatus, and non-transitive computer-readable medium described herein may further include processes, features, means, or instructions for transmitting to a UE a representation of a set of time resources for a search space. Some examples of the method, apparatus, and non-transitive computer-readable medium described herein may further include processes, features, means, or instructions for removing time resources of a set of time resources identified from a represented set of time resources for a search space, wherein the identified search space includes the remaining time resources of a represented set of time resources for a search space.

[0040] In some examples of the methods, apparatus, and non-temporal computer-readable media described herein, the indication of a set of time resources for a search space includes a time window for the search space. In some examples of the methods, apparatus, and non-temporal computer-readable media described herein, a subset of slots of the time window includes an identified search space. In some examples of the methods, apparatus, and non-temporal computer-readable media described herein, a subset of slots includes each slot of the time window.

[0041] Some examples of the methods, apparatus, and non-transient computer-readable media described herein may further include processes, features, means, or instructions for transmitting an SSB to a UE, and the first RACH message may be received at a RACH occupant corresponding to the SSB. Brief explanation of the drawing

[0042] FIGS. 1 and 2 illustrate examples of wireless communication systems that support search space configurations for random access (RACH) messaging according to embodiments of the present disclosure. FIG. 3 illustrates an example of a signaling timeline that supports search space configurations for RACH messaging according to embodiments of the present disclosure. FIG. 4 illustrates examples of possible multiplexing patterns that support search space configurations for RACH messaging according to the embodiments of the present disclosure. FIG. 5 illustrates an example of a process flow that supports search space configurations for RACH messaging according to the embodiments of the present disclosure. FIGS. 6 through 8 illustrate block diagrams of a device supporting search space configurations for RACH messaging according to embodiments of the present disclosure. FIG. 9 illustrates a block diagram of a system including a user device (UE) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. FIGS. 10 to 12 illustrate block diagrams of a device supporting search space configurations for RACH messaging according to embodiments of the present disclosure. FIG. 13 illustrates a block diagram of a system including a base station that supports search space configurations for RACH messaging according to embodiments of the present disclosure. FIGS. 14 through 16 illustrate flowcharts illustrating methods for search space configurations for RACH messaging according to embodiments of the present disclosure. Specific details for implementing the invention

[0043] In some wireless communication systems (e.g., New Radio (NR) systems), a User Equipment (UE) may perform a Random Access (RACH) procedure with a base station to obtain access to a wireless network. This RACH procedure may involve the communication of multiple messages between the UE and the base station, including the transmissions of RACH Message 1 (Msg1), Message 2 (Msg2), Message 3 (Msg3), and Message 4 (Msg4). The UE may transmit RACH Msg1 (e.g., a RACH preamble transmission) to the base station to initiate the RACH procedure. In some cases, the UE may receive a set of synchronization signal blocks (SSBs) from the base station and select one of the SSBs to use for transmitting RACH Msg1. The base station may respond to RACH Msg1 with RACH Msg2 (e.g., a RAR message within a Random Access Response (RAR) window). The UE may then transmit a RACH Msg3 (e.g., a Radio Resource Control (RRC) access request) or receive a RACH Msg4 (e.g., a Media Access Control (MAC) control element (CE) for contention resolution) from the base station in response. The scheduling of each of these messages may be based on Physical Downlink Control Channel (PDCCH) signaling from the base station to the UE. To receive PDCCH signaling (e.g., a PDCCH grant) while supporting efficient retransmission capabilities, the UE may identify RACH message 2, 3, or 4 (Msg 2 / 3 / 4) search spaces to monitor corresponding PDCCH transmissions.

[0044] For example, the UE identifies a set of SSB transmissions performed by the base station. In some cases, the UE may determine this set of SSBs based on residual minimum system information (RMSI) signaling from the base station. The UE may identify the SSBs selected for the RACH procedure and the set of non-QCL SSBs, and may determine the time resources used by the base station for these non-QCL SSB transmissions. The UE may also identify a search space (e.g., a depot or configured Msg 2 / 3 / 4 search space) that does not overlap with the time resources for the non-QCL SSBs. This may allow the UE to switch receive beams to monitor PDCCH transmissions and non-QCL SSBs within the Msg 2 / 3 / 4 search space.

[0045] In the first example, the UE may determine the RMSI search space configured via a physical broadcast channel (PBCH) transmission, or modify the RMSI search space by removing any resources that temporally conflict with the time resources for non-QCL SSBs. The UE may identify the Msg 2 / 3 / 4 search space contained within a response window (e.g., RAR window) using monitoring occupations of the modified RMSI search space. In the second example, the UE may use an effective RMSI search space that does not overlap with the time resources for non-QCL SSBs as the Msg 2 / 3 / 4 search space, wherein the effective RMSI search space may not be signaled on the PBCH. In the third example, the UE may receive a Msg 2 / 3 / 4 search space configuration from the base station. This configuration may include a time range and a symbol allocation along the time range for reduced configuration signaling overhead—as opposed to unique symbol allocations for each slot. The identified Msg 2 / 3 / 4 search space may be based on the indicated time range and symbol allocation, but may also remove resources from configurations that overlap with time resources for non-QCL SSBs. In any of the examples described herein, the UE may monitor the identified search space to receive PDCCH transmissions while maintaining the ability to receive non-QCL SSBs from the base station. Receiving these non-QCL SSBs may reduce latency during the RACH procedure and improve the reliability of RACH message retransmissions by the UE.

[0046] Aspects of the present disclosure are first described in the context of wireless communication systems. Further aspects of the present disclosure are described with respect to signaling timelines, multiplexing patterns, and process flows. Aspects of the present disclosure are also illustrated by and described with reference to device diagrams, system diagrams, and flowcharts relating to search space configurations for RACH messaging.

[0047] FIG. 1 illustrates an example of a wireless communication system (100) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The wireless communication system (100) includes base stations (105), UEs (115), and a core network (130). In some examples, the wireless communication system (100) may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or an NR network. In some cases, the wireless communication system (100) may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices.

[0048] Base stations (105) may communicate wirelessly with UEs (115) through one or more base station antennas. Base stations (105) may include or be referred to by those skilled in the art as base transceiver stations, wireless base stations, access points, wireless transceivers, NodeB, eNodeB (eNB), next-generation NodeB or giga-nodeB (either of which may be referred to as gNB), home NodeB, home eNodeB, or some other suitable term. A wireless communication system (100) may include different types of base stations (105) (e.g., macro or small cell base stations). The UEs (115) described herein may be able to communicate with various types of base stations (105) and network equipment, including macro eNBs, small cell eNBs, gNBs, repeater base stations, etc.

[0049] Each base station (105) may be associated with a specific geographical coverage area (110) in which communications with various UEs (115) are supported. Each base station (105) may provide communication coverage for an individual geographical coverage area (110) via communication links (125), and the communication links (125) between the base station (105) and the UE (115) may utilize one or more carriers. The communication links (125) illustrated in the wireless communication system (100) may include uplink transmissions from the UE (115) to the base station (105), or downlink transmissions from the base station (105) to the UE (115). Downlink transmissions may also be referred to as forward link transmissions, while uplink transmissions may also be referred to as reverse link transmissions.

[0050] The geographical coverage area (110) for a base station (105) may be divided into sectors that constitute only a part (not shown) of the geographical coverage area (110), and each sector may be associated with a cell. For example, each base station (105) may provide communication coverage for a macro cell, a small cell, a hot spot, or other types of cells, or various combinations thereof. In some examples, the base station (105) is mobile and thus may provide communication coverage for a moving geographical coverage area (110). In some examples, different geographical coverage areas (110) associated with different technologies may overlap, and overlapping geographical coverage areas (110) associated with different technologies may be supported by the same base station (105) or by different base stations (105). The wireless communication system (100) may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network in which base stations (105) of different types provide coverage for various geographical coverage areas (110).

[0051] The term “cell” may refer to a logical communication entity used for communication with a base station (105) (e.g., via a carrier) and may be associated with an identifier (e.g., physical cell identifier (PCID), virtual cell identifier (VCID)) for distinguishing neighboring cells operating via the same or different carriers. In some examples, the carrier may support multiple cells and the different cells may be configured according to different protocol types (e.g., machine-type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or others) that may provide access to different types of devices. In some cases, the term “cell” may refer to a part (e.g., a sector) of the geographical coverage area (110) where the logical entity operates.

[0052] UEs (115) may be scattered throughout the wireless communication system (100), and each UE (115) may be stationary or mobile. A UE (115) may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or other suitable term, wherein “device” may also be referred to as a unit, a station, a terminal, or a client. A UE (115) may 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) may 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, etc., which may be implemented in various items such as appliances, vehicles, instruments, etc.

[0053] Some UEs (115), such as MTCs or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via M2M (Machine-to-Machine) communication). M2M communication or MTC may refer to data communication technologies that allow devices to communicate with each other or with a base station (105) without human intervention. In some examples, M2M communication or MTC may include communications from devices that incorporate sensors or meters for measuring or capturing information, relay that information to a central server or application program that can use the information, or present the information to humans interacting with the program or application. Some UEs (115) may 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, troop management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0054] Some UEs (115) may be configured to adopt operating modes that reduce power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication through transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power conservation techniques for the UEs (115) include entering a "deep sleep" mode to save power when not engaged in active communication, or operating through a limited bandwidth (e.g., according to narrowband communication). In some cases, the UEs (115) may be designed to support critical functions (e.g., mission-critical functions), and the wireless communication system (100) may be configured to provide these functions for ultra-reliable communication.

[0055] In some cases, a UE (115) may also be able to communicate directly with other UEs (115) (e.g., using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more of the groups of UEs (115) utilizing D2D communication may be within the geographical coverage area (110) of the base station (105). Other UEs (115) in such a group may be outside the geographical coverage area (110) of the base station (105) or otherwise may not be able to receive transmissions from the base station (105). In some cases, the group of UEs (115) communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE (115) transmits to all other UEs (115) in the group. In some cases, the base station (105) facilitates the scheduling of resources for D2D communications. In other cases, D2D communication is performed between UEs (115) without the involvement of a base station (105).

[0056] Base stations (105) may communicate with the core network (130) and with each other. For example, base stations (105) may interface with the core network (130) through backhaul links (132) (e.g., through S1 or other interfaces). Base stations (105) may communicate with each other on backhaul links (134) (e.g., through X2 or other interfaces) directly (e.g., directly between base stations (105)) or indirectly (e.g., through the core network (130)).

[0057] The core network (130) may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network (130) may be an advanced packet core (EPC) that may 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 may manage non-access layer (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 may be transmitted through the S-GW, and the S-GW itself may be connected to the P-GW. The P-GW may provide IP address allocation as well as other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, intranet(s), IP multimedia subsystem (IMS), and packet-switched (PS) streaming services.

[0058] At least some of the network devices, such as base stations (105), may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UEs (115) through a number of other access network transmitting entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). In some configurations, the various functions of each access network entity or base station (105) may be distributed across various network devices (e.g., radio heads and access network controllers) or integrated into a single network device (e.g., base station (105)).

[0059] A wireless communication system (100) may typically operate using one or more frequency bands in the range of 300 MHz to 300 GHz. Generally, the range of 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range in length from approximately 1 decimeter to 1 meter. UHF waves may be blocked or deflected by building and environmental features. However, the waves may penetrate structures sufficient to provide service to UEs (115) located indoors by macro cells. Transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 km) compared to transmission using smaller frequencies and longer waves in the high frequency (HF) or ultra-high frequency (VHF) portions of the spectrum below 300 MHz.

[0060] The wireless communication system (100) may also operate in the ultra-high frequency (SHF) range using a frequency band of 3 GHz to 30 GHz, known as the centimeter band. The SHF range includes bands, such as the 5 GHz industrial, scientific, medical (ISM) band, which may be opportunistically used by devices that allow interference from other users.

[0061] The wireless communication system (100) may also operate in the ultra-high frequency (EHF) region of the spectrum (e.g., 30 GHz to 300 GHz), which is well known as the millimeter band. In some examples, the wireless communication system (100) may support millimeter wave (mmW) communications between UEs (115) and base stations (105), and the EHF antennas of individual devices may be spaced much smaller and closer together than UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE (115). However, the propagation of EHF transmitters may undergo much greater atmospheric attenuation and a shorter range than that of SHF or UHF transmitters. The techniques described herein may be adopted across transmissions using one or more different frequency regions, and the designated use of bands following these frequency regions may vary by country or regulatory body.

[0062] In some cases, the wireless communication system (100) may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system (100) may adopt License Assisted Access (LAA), LTE-U (LTE-Unlicensed) radio access technology, or NR technology in an unlicensed band, such as the 5 GHz ISM band. When operating in unlicensed radio frequency spectrum bands, wireless devices such as base stations (105) and UEs (115) may employ Listen-Before-Talk (LBT) procedures to ensure that the frequency channel is clear before transmitting data. In some cases, operations in unlicensed bands may be based on a CA configuration (e.g., LAA) in conjunction with CCs operating in the unlicensed band. Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination thereof. Duplexing in the unlicensed spectrum can be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination thereof.

[0063] In some examples, a base station (105) or UE (115) may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. For example, a wireless communication system may use a transmit method between a transmit device (100) (e.g., base station (105)) and a receive device (e.g., UE (115)), wherein the transmit device has multiple antennas and the receive devices have one or more antennas. MIMO communication may employ multiple path signal propagation to increase spectral efficiency by transmitting or receiving multiple signals through different spatial layers, which may be referred to as spatial multiplexing. Multiple signals may be transmitted by the transmit device, for example, through different antennas or different combinations of antennas. Likewise, multiple signals may be received by the receive device through different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO technologies include Single-User MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device, and Multiple-User MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0064] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., base station (105) or UE (115)) to shape or steer an antenna beam (e.g., a transmitting beam or a receiving beam) along a spatial path between a transmitting device and a receiving device. Beamforming is realized by combining signals transmitted through the antenna elements of an antenna array such that signals propagating in specific orientations experience constitutive interference, while others experience destructive interference. The adjustment of signals transmitted through the antenna elements may include the transmitting device or the receiving device applying specific amplitude and phase offsets to the signals being returned through each of the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a specific orientation (e.g., for the antenna array of the transmitting device or the receiving device or for some other orientation).

[0065] In one example, the base station (105) may perform beamforming operations for directional communication with the UE (115) using multiple antennas or antenna arrays. For example, some signals (e.g., synchronization signals, reference signals, beam select signals, or other control signals) may be transmitted multiple times in different directions by the base station (105), which may include the transmission of signals according to different beamforming weight sets associated with transmission in different directions. Transmissions in different beam directions may be used to identify the beam direction for subsequent transmission and / or reception by the base station (105) (e.g., by the base station (105) or a receiving device, such as the UE (115)). Some signals, such as data signals associated with a specific receiving device, may be transmitted by the base station (105) in a single beam direction (e.g., in a direction associated with a receiving device, such as the UE (115)). In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on signals transmitted in different beam directions. For example, the UE (115) may receive one or more signals transmitted by the base station (105) in different directions, and the UE (115) may report to the base station (105) an indication of the received signal with the best signal quality, or in other cases, acceptable signal quality. Although these techniques are described with reference to signals transmitted in one or more directions by the base station (105), the UE (115) may employ similar techniques for transmitting signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by the UE (115)) or for transmitting a signal in a single direction (e.g., to transmit data to a receiving device).

[0066] A receiving device (e.g., a UE (115) which may be an example of a mmW receiving device) may attempt multiple receiving beams when receiving various signals from a base station (105), such as synchronization signals, reference signals, beam select signals, or other control signals. For example, the receiving device may attempt multiple receiving directions by receiving through different antenna subarrays, by processing signals received according to different antenna subarrays, by receiving according to different sets of receiving beamforming weights applied to signals received from a set of antenna elements of an antenna array, or by processing signals received according to different sets of receiving beamforming weights applied to signals received from a set of antenna elements of an antenna array, any of which may be referred to as "listening" according to different receiving beams or receiving directions. In some examples, the receiving device may use a single receiving beam to receive along a single beam direction (e.g., when receiving a data signal). A single receiving beam may be aligned to a beam direction determined based on listening according to different receiving beam directions (e.g., a beam direction determined based on listening according to multiple beam directions to have the highest signal strength, highest signal-to-noise ratio, or otherwise acceptable signal quality).

[0067] In some cases, the antennas of the base station (105) or the UE (115) may be located within one or more antenna arrays that may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be juxtaposed in an antenna assembly such as an antenna tower. In some cases, the antennas or antenna arrays associated with the base station (105) may be located at various geographical locations. The base station (105) may have an antenna array having multiple rows and columns of antenna ports that the base station (105) may use to support beamforming of communications with the UE (115). Likewise, the UE (115) may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0068] In some cases, the wireless communication system (100) may be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. In some cases, the Radio Link Control (RLC) layer may communicate through logical channels by performing packet segmentation and reassembly. The MAC layer may perform priority processing and multiplexing of logical channels into transport channels. The MAC layer may also improve link efficiency by providing retransmission at the MAC layer using Hybrid Automatic Repeat Request (HARQ). In the control plane, the RRC protocol layer may provide the establishment, configuration, and maintenance of RRC connections between the core network (130) or base stations (105) supporting radio bearers for user plane data and the UE (115). In the physical (PHY) layer, transport channels may be mapped to physical channels.

[0069] In some cases, UEs (115) and base stations (105) may support data retransmissions to increase the likelihood that data will be successfully received. HARQ feedback is a technique that increases the likelihood that data will be accurately received over a communication link (125). HARQ may include a combination of error detection (e.g., using periodic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the (MAC) layer under poor radio conditions (e.g., signal-to-noise conditions). In some cases, the radio device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in the previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot or according to some other time interval.

[0070] Time intervals in LTE or NR can be expressed as multiples of the basic time unit, which is, for example, T s = It can also be referred to as a sampling period of 1 / 30,720,000 seconds. The time intervals of communication resources can be configured according to wireless frames each having a duration of 10 milliseconds (ms), where the frame period is T f = 307,200 T sIt may also be expressed as. Wireless frames may be identified by a system frame number (SFN) in the range of 0 to 1023. Each frame may contain 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. Subframes may be further divided into 2 slots each having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the periodic prefix appended before each symbol period). Excluding the periodic prefix, each symbol period may contain 2048 sample periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system (100) and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system (100) may be shorter than a subframe, or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers (CCs) using sTTIs).

[0071] In some wireless communication systems, a slot may additionally be divided into a number of mini-slots containing one or more symbols. In some cases, a symbol or mini-slot of a mini-slot may be the minimum unit of scheduling. Each symbol may have a duration that varies, for example, depending on the subcarrier interval or the frequency band of operation. Additionally, some wireless communication systems may implement slot aggregation in which a number of slots or mini-slots are used for communication between the UE (115) and the base station (105) and aggregated together.

[0072] The term “carrier” may refer to a set of radio frequency spectrum resources having a physical layer structure defined to support communications on a communication link (125). For example, a carrier of a communication link (125) may 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 may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Advanced Universal Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be positioned according to a channel raster for discovery by UEs (115). Carriers may be downlink or uplink (e.g., in FDD mode) or may be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, signal waveforms transmitted through a carrier may be composed of multiple subcarriers (using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform-spread-OFDM (DFT-s-OFDM).

[0073] The organizational structure of carriers may differ for different wireless access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR, etc.). For example, communication over a carrier may be organized according to TTIs or slots, each of which may include control information or signaling to support decoding user data as well as user data. A carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate operations for the carrier. In some examples (e.g., in a carrier aggregation configuration), a carrier may also have control signaling or acquisition signaling to coordinate operations for other carriers.

[0074] Physical channels may be multiplexed over a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed over a downlink carrier using, for example, 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 may be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0075] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the wireless communication system (100) or the carrier. For example, the carrier bandwidth may be one of a plurality of predetermined bandwidths for carriers of a specific wireless access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each serviced UE (115) may be configured to operate on all or part of the carrier bandwidth. In other examples, some UEs (115) may be configured for operation using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within the carrier (e.g., an "in-band" deployment of the narrowband protocol type).

[0076] In systems employing MCM technologies, a resource element may consist of one symbol period (e.g., the duration of one modulated symbol) and one subcarrier, and the symbol period and subcarrier interval are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements the UE (115) receives and the higher the order of the modulation scheme, the higher the data rate for the UE (115). In MIMO systems, radio communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and the use of multiple spatial layers may further increase the data rate for communication with the UE (115).

[0077] Devices of the wireless communication system (100) (e.g., base stations (105) or UEs (115)) may have a hardware configuration that supports communications over a specific carrier bandwidth or may be configured to support communications over one of a set of carrier bandwidths. In some examples, the wireless communication system (100) may include base stations (105) and / or UEs that can support simultaneous communications over carriers associated with more than one different carrier bandwidth.

[0078] The wireless communication system (100) may support communication with a UE (115) on multiple cells or carriers, and this feature may be referred to as CA or multi-carrier operation. The UE (115) may be composed of multiple downlink CCs and one or more uplink CCs according to the carrier aggregation configuration. The CA may be used as both FDD and TDD CCs.

[0079] In some cases, the wireless communication system (100) may utilize enhanced component carriers (eCCs). An eCC may be characterized by one or more features, including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a CA configuration or a duplex configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may 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 characterized by a wide carrier bandwidth may include one or more segments that may be utilized by UEs (115) that are not able to monitor the full carrier bandwidth or otherwise are configured to use a limited carrier bandwidth (e.g., to conserve power).

[0080] In some cases, the eCC may utilize a symbol duration different from that of other CCs, which may involve the use of a reduced symbol duration compared to the symbol durations of other CCs. A shorter symbol duration may be associated with an increased spacing between adjacent subcarriers. A device utilizing eCCs, such as a UE (115) or a base station (105), may transmit bandwidth signals at reduced symbol durations (e.g., 16.67 microseconds) (e.g., depending on the carrier bandwidth or frequency channel, such as 20, 40, 60, 80 MHz). The TTI in the eCC may consist of one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in the TTI) may be variable.

[0081] Wireless communication systems, such as NR systems, may utilize any combination of licensed, shared, and unlicensed spectrum bands, among other things. Flexibility in eCC symbol duration and subcarrier spacing may allow for the use of eCC along multiple spectra. In some examples, NR shared spectrum may increase spectrum usage and spectrum efficiency, particularly through the dynamic vertical (e.g., across frequencies) and horizontal (e.g., across time) sharing of resources.

[0082] In some wireless communication systems, a UE (115) may perform a RACH procedure with a base station (105) to obtain access to a wireless network. This RACH procedure may include the communication of multiple messages between the UE (115) and the base station (105), including RACH Msg1, Msg2, Msg3, and Msg4 transmissions. The UE (115) may transmit RACH Msg1 (e.g., a RACH preamble transmission) to the base station (105) to initiate the RACH procedure. In some cases, the UE (115) may receive a set of SSBs from the base station (105) and select one of the SSBs to use for transmitting RACH Msg1. The base station (105) may respond to RACH Msg1 with RACH Msg2 (e.g., a RAR message within a RAR window). The UE (115) may then transmit a RACH Msg3 (e.g., an RRC connection request) and receive a RACH Msg4 (e.g., a MAC CE for contention resolution) from the base station (105) in response. The scheduling of each of these messages may be based on PDCCH signaling from the base station (105) to the UE (115). To receive PDCCH signaling (e.g., a PDCCH grant) while supporting efficient retransmission capabilities, the UE (115) may identify RACH Msg 2 / 3 / 4 search spaces to monitor corresponding PDCCH transmissions.

[0083] For example, the UE (115) identifies a set of SSB transmissions performed by the base station (105). In some cases, the UE (115) may determine this set of SSBs based on RMSI signaling from the base station (105). The UE (115) may identify SSBs among a set of SSBs selected for the RACH procedure and non-QCL SSBs, and may determine the time resources used by the base station (105) for these non-QCL SSB transmissions. The UE (115) may also identify a search space (e.g., a depot or configured Msg 2 / 3 / 4 search space) that does not overlap with the time resources for the non-QCL SSBs.

[0084] In the first example, the UE (115) may determine the RMSI search space configured via PBCH transmission, or modify the RMSI search space by removing any resources that conflict temporally with the time resources for non-QCL SSBs. The UE (115) may identify the Msg 2 / 3 / 4 search space contained within the response window (e.g., RAR window) using monitoring occations of the modified RMSI search space. In the second example, the UE (115) may use an effective RMSI search space that does not overlap with the time resources for non-QCL SSBs as the Msg 2 / 3 / 4 search space, wherein the effective RMSI search space may not be signaled in the PBCH. In the third example, the UE (115) may receive the Msg 2 / 3 / 4 search space configuration from the base station (105). This configuration may include time ranges and symbol assignments along time ranges for reduced configuration signaling overhead—as opposed to unique symbol assignments for each slot. The identified Msg 2 / 3 / 4 search space may be based on the indicated time ranges and symbol assignments, but may also remove resources from configurations that overlap with time resources for non-QCL SSBs. In any of the examples described herein, the UE (115) may monitor the identified search space to receive PDCCH transmissions while maintaining the ability to receive non-QCL SSBs from the base station (105). Receiving these non-QCL SSBs may reduce latency during the RACH procedure and improve the reliability of RACH message retransmissions by the UE (115).

[0085] FIG. 2 illustrates an example of a wireless communication system (200) that supports search space configurations for RACH message responses according to embodiments of the present disclosure. The wireless communication system (200) may include a base station (105-a) and a UE (115-a), which may be examples of the base station (105) and UE (115) described with reference to FIG. 1. The base station (105-a) may provide network coverage for a geographic coverage area (110-a). As illustrated, the UE (115-a) may obtain access to the network by performing a RACH procedure. The RACH procedure may include the UE (115-a) receiving downlink RACH messaging in a default or configured search space.

[0086] For example, a base station (105-a) may periodically or non-periodically transmit a set of SSBs (210) on different transmit beams (205) (e.g., in a beam-sweep procedure). These different SSBs (210) may be transmitted by QCL or non-QCL antennas at the base station (105-a). In order for the UE (115-a) to access the network, the UE (115-a) may monitor the SSBs (210) by the base station (105-a). In some cases, the UE (115-a) may detect and decode multiple SSBs (210) from the base station (105-a) on different receive beams (215). For example, the base station (105-a) may transmit an SSB (210-a) on the transmit beam (205) and an SSB (210-b) on the transmit beam (205-b), and the UE (115-a) may receive SSBs (210) on the receive beam (215-a) and the receive beam (215-b), respectively. The UE (115-a) may select one of these SSBs (210) (for example, based on the receive power or channel quality associated with the SSB (210)) and may perform a RACH procedure based on information at the selected SSB (210). For example, the UE (115-a) may select an SSB (210-a) and transmit a RACH message (220) based on information or parameters at the SSB (210-a). This RACH message (220) may be an example of RACH Msg1 or RACH Msg3.

[0087] The UE (115-a) may monitor a PDCCH signal. This signal may be a PDCCH component of RACH Msg2, RACH Msg3, or RACH Msg4 (RACH Msg 2 / 3 / 4), such as a PDCCH grant. For example, the PDCCH signal may be a response to a RACH message (220). To process RACH Msg 2 / 3 / 4, the UE (115-a) may monitor a search space for scheduling grants or scheduling assignments corresponding to RACH Msg 2 / 3 / 4. A search space may include a set of carrier channels formed by control channel elements (CCEs) at a specific aggregation level. In some cases, the UE (115-a) may monitor multiple search spaces at the same or different aggregation levels. UE (115-a) may attempt to decode (e.g., blind decoding) any PDCCHs formed by CCEs within the search space for UE (115-a). If the decoded PDCCH passes a parity check (e.g., CRC), UE (115-a) may process the contents of the PDCCH. Processing this information may allow UE (115-a) to accurately transmit or receive specific RACH messages, such as RACH messages 2, 3, or 4.

[0088] In some cases, the UE (115-a) may receive a configuration of the search space (e.g., via a PBCH transmission or an SSB (210)). This configuration may define symbol indices, slots, etc. for the search space, define a time range for the search space, or define a specific search space (e.g., having a random access search space upper-level parameter for a Type 1-PDCCH common search space). In other cases, the UE (115-a) may not receive a configuration of the search space. In these cases, the UE (115-a) may identify a default search space that is utilized to receive PDCCH information. In some cases, this default search space may be based on an RMSI search space (e.g., a Type 0-PDCCH common search space). For example, the default search space may share associations between monitoring occupants and SSBs (210) or PBCH transmissions with the RMSI search space. This default Msg 2 / 3 / 4 search space may also be based on the response window (e.g., RAR window) for the RACH message (220).

[0089] However, the default Msg 2 / 3 / 4 search space may result in timing issues by simply using the configured RMSI search space. For example, the UE (115-a) may utilize a specific RMSI periodicity (e.g., 20ms if the control resource set (CORESET) for the RMSI search space is SSBs (210) and TDM). However, the UE (115-a) may implement a RAR window of a different length or maximum length (e.g., 10ms) that may be shorter than the RMSI periodicity. In certain cases, the RMSI search space may be located within the RAR window (e.g., based on iterations longer than the window between iterative RMSI search spaces). Accordingly, the UE (115-a) may decide to retransmit the RACH message (220) based on the completion of the RAR window before monitoring the response based on the RMSI search space (for example, if the RAR search space directly corresponds to the RMSI search space, the RAR search space cannot exist within the RAR window). Additionally, in some cases, the UE (115-a) may not be able to track the SSBs (210) transmitted by the base station (105-a) in the symbols used by the UE (115-a) to monitor the search space for PDCCH transmissions.

[0090] To handle search space timing better, the search space may be based on the actually transmitted SSBs (210). For example, base stations (105) may support multiple SSBs (210) (e.g., a total of 64 SSBs (210)). Each SSB (210) in this group of SSBs (210) may or may not be QCL, and the UE (115-a) may treat the SSBs (210) as if they were not non-QCL (e.g., whether this assumption is technically correct or not). Each SSB (210) in this group of SSBs (210) may correspond to a specific transmission direction. In some cases, the base station (105-a) may use a subset of the group of these SSBs (210) and may not use other SSBs (210) based on the configuration or arrangement of the base station (105-a). The base station (105-a) may indicate in the RMSI the SSBs (210) that the base station (105-a) actually transmits (e.g., using SSB indices, where each SSB index corresponds to the transmission time for the SSB (210) actually transmitted and the SSB (210)). The UE (115-a) may identify the set of time resources used for the transmission of the actual SSB (210) by the selected SSB (210) and the base station (105-a) that is not QCL. The search space for the UE (115-a) (e.g., configured or default) may prevent overlapping this set of identified time resources.

[0091] In the first example, resources may be removed from the search space to result in the Msg 2 / 3 / 4 search space. For example, for the configured search space, the UE (115-a) may remove any resources from the configured search space that overlap with the set of identified time resources (e.g., time resources used for the selected SSB (210) transmission and the actual SSB (210) transmissions that are non-QCL). For the default search space, the UE (115-a) may identify the RMSI search space (e.g., indicated in the SSB (210) or PBCH transmission). The UE (115-a) may use the symbol locations of the RMSI search space for the Msg 2 / 3 / 4 search space, but may also remove any symbol locations that overlap with the set of identified time resources. In some cases, Msg 2 / 3 / 4 may use the same symbol locations as the RMSI search space, but may also use different slot-level periodicity to avoid a set of identified time resources. For example, if there are 20 slots in the RAR window and 4 of these slots have SSB symbol locations that overlap with the symbol locations of the search space, the Msg 2 / 3 / 4 search space may be modified for these 4 slots and span only the other 16 slots. In this way, the modified RMSI search space used in the Msg 2 / 3 / 4 search space may avoid timing conflicts with non-QCL SSBs (210). In some cases, this default search space may start from the end of the RACH message (220) transmission over the duration of the RAR window.

[0092] In the second example, a valid RMSI search space that does not temporally overlap with the set of identified time resources may not be used for the Msg 2 / 3 / 4 search space. In some cases, the UE (115-a) may determine the RMSI search space indicated in the SSB (210) or PBCH transmission and may identify that the RMSI search space overlaps with the set of identified time resources and timing resources. Based on this timing resource conflict, the UE (115-a) may select a different RMSI search space than the one indicated. In other cases, the UE (115-a) may automatically select a different RMSI search space regardless of the search space indicated in the SSB (210) or PBCH transmission. In some cases, the UE (115-a) may select an RMSI search space having a CORESET that is TDMed with the SSB (210) transmissions to prevent overlap with timing resources.

[0093] In any of the examples described herein, the UE (115-a) may identify the Msg 2 / 3 / 4 search space based on the described techniques. The base station (105-a) may utilize similar techniques to determine CCE resources to use for PDCCH transmissions (e.g., for RACH Msg 2 / 3 / 4). The base station (105-a) may transmit the PDCCH transmission using the same transmit beam (205-a) as the selected SSB (210-a), and the UE (115-a) may monitor the channel using the same receive beam (215-a) that received the SSB (210-a). A UE (115-a) may monitor PDCCH transmitters and SSBs (210-a) using a receive beam (215-a) during the time resources of the identified Msg 2 / 3 / 4 search space, or monitor non-QCL SSBs (210) (e.g., SSB (210-b)) using different receive beams (e.g., receive beam (215-b)) during a set of identified time resources. In this way, if retransmissions of RACH messages (220) are required, a UE (115) supporting a single receive beam may track non-QCL SSBs (210) during the RACH procedure. For example, any UE (115) having a single antenna panel may implement this procedure to switch between receive beams.

[0094] FIG. 3 illustrates an example of a signaling timeline (300) that supports search space configurations for RACH messaging responses according to embodiments of the present disclosure. The signaling timeline (300) may illustrate approximate timing of processes of the UE (115) described with reference to FIG. 1 and FIG. 2. This approximate timing may correspond to one or more TTIs, such as symbol indices or locations within slots or subframes. The timeline (300) illustrates the reception of SSBs (310) in the UE (115), the RACH occlusion (315) corresponding to the received SSBs (310), and the reception or monitoring of RACH Msg2 (325) retransmissions according to the default search space. These signals or processes may be repeated in time (305) based on the reception process and the RAR window (320). Although the signaling timeline (300) is described for the transmission of RACH Msg2 (325), the same or similar processes may be performed to receive PDCCH messages (e.g., grants) for any of the RACH messaging, including the transmissions of RACH Msg3 and RACH Msg4.

[0095] In some examples, the UE (115) may receive multiple SSBs (310) from the base station (105). These SSBs (310) may be received at different times and may be received from different antennas or beams at the base station (105) that are not QCL. Based on these SSBs (310) that are not QCL, the UE (115) may receive a first SSB (310-a) on a first receiving beam and a second SSB (310-b) on a second receiving beam. In some cases, the UE (115) may receive the SSB (310) on multiple receiving beams and may select one of the receiving beams to associate with the SSB (310) based on the highest reference signal receiving power (RSRPs) of the receiving beams. Additionally or alternatively, the UE (115) may receive other SSBs (310) on the first receiving beam, the second receiving beam, additional receiving beams, or some combination thereof. The UE (115) may select one of the SSBs (310) for the RACH procedure. In some cases, the UE (115) may select an SSB (310) based on signal quality, channel conditions, expected reliability, or some similar parameters associated with the SSB (310). As illustrated, the UE (115) may select an SSB (310-b).

[0096] The UE (115) may perform RACH messaging transmission at the RACH OKA (315) corresponding to the selected SSB (310-b). In some cases, each SSB (310) may correspond to a different RACH OKA (315) (e.g., SSB (310-a) corresponding to RACH OKA (315-a) and SSB (310-b) corresponding to RACH OKA (315-b). The base station (105) may transmit the SSBs (310) at the beginning of the RACH configuration cycle, and the RACH OKA (315) may be located at the end of the RACH configuration cycle. UE (115) may also transmit a RACH message (e.g., RACH Msg1) to the base station in the RACH OKEN (315-b) based on selecting SSB (310-b).

[0097] The UE (115) may monitor for a response from the base station (105) to a transmitted RACH message. For example, the UE (115) may monitor for a response (e.g., sending a RACH Msg2 (325)) during the RAR window (320). If the UE (115) receives a response during the RAR window (320), the UE (115) may proceed to the next step of the access procedure (e.g., sending another type of RACH message, establishing a link, etc.). If the UE (115) does not receive a response during the RAR window (320), the UE (115) may retransmit a RACH message from another RACH OKZ (315). If the RAR window (320) does not include a backoff period or a minimum backoff period, the UE (115) may resend the RACH message at any time following the RAR window (320) (e.g., any time corresponding to the RACH OK period (315)).

[0098] The UE (115) may transmit RACH messages in the RACH OKEN (315-b) according to the selected SSB (310-b). For example, the UE (115) may utilize the transmit beam based on the receive beam used to receive the SSB (310-b) and may monitor responses using the same receive beam. This is based on the demodulation reference signals (DMRS) for the Msg2 grant being QCL selected SSB (310-b) and QCL here, the UE (115) may receive QCL transmits on the same receive beams and non-QCL transmits on different receive beams. The UE (115) may monitor responses during the RAR window (320). In some cases, the RAR window (320) may start after or at the time of transmission of a RACH message (e.g., utilized RACH OKEN (315-b)) and may end based on a RAR timer or length. As illustrated, the RAR window (320) overlaps the SSB (310) locations.

[0099] If the UE (115) does not receive a search space configuration from the base station (105), the UE (115) may identify a default search space to use for monitoring responses to transmitted RACH messages. In other cases, the UE (115) may receive an indication of the search space configuration, and the search space configuration includes a start time and an end time. Whether implementing RACH response monitoring by default or by a configured search space, the UE (115) may monitor one search space per TTI (e.g., slot). The start symbol of the search space may remain the same for each of these slots. In some cases, the UE (115) may monitor the search space in each slot within the RAR window (320) (e.g., for a default search space where no start or end time is indicated). For the default search space, the UE (115) may reuse the symbol locations associated with the RMSI search space as the symbol locations for the default search space for RACH responses.

[0100] However, in some cases, utilizing the search space in each slot of the RAR window (320) may lead to an overlap of the time resources used for SSB (310) transmissions and the search space. For example, the search space monitored by the UE (115) and the SSB (310) transmission by the base station (105) may share a symbol location. To distinguish between the RACH Msg2 (325) transmission and the SSB (310) that overlap in time resources, the base station (105) and the UE (115) may perform FDM. When these transmissions are QCL (e.g., SSB (310-b) and RACH Msg2 (325)), this FDM procedure may allow the same receive beam at the UE (115) to receive both transmissions. However, if these transmissions are not QCLed (e.g., SSB (310-a) and RACH Msg2 (325)), the UE (115) may not be able to receive transmissions for the same receive beam using the FDM procedure. Therefore, (e.g., if the UE (115) operates using the receive beam at once), the UE (115) may not be able to track SSB (310-a) while monitoring the response message for the receive beam corresponding to SSB (310-b).

[0101] In some cases, the UE (115) may not be able to successfully receive and decode the RACH Msg2 (325) transmission during the RAR window (320). In these cases, the completion of the RAR window (320) may trigger the UE (115) to retransmit the RACH message and monitor for a response again. If the UE (115) cannot track the SSB (310-a) during the RAR window (320) (e.g., due to overlapping time resources), the UE (115) may not be able to utilize the RACH occlusion (315-a) corresponding to the SSB (310-a) following the RAR window (320). This reduces the reliability of RACH message transmissions and increases latency. For example, assuming there is no backoff period—or almost no backoff period—the UE (115) may retransmit the RACH message in the RACH OKED (315-a) following the RAR window (320) when the SSB (310-a) is received, allowing the UE (115) to perform the retransmission at a faster speed than when the UE (115) wants to retransmit the RACH message in the RACH OKED (315-b). However, if the UE (115) does not receive the SSB (310-a) during the RAR window (320) (e.g., due to monitoring the search space using the receiving beam associated with the SSB (310-b) rather than the SSB (310-a)), the UE (115) cannot utilize the corresponding RACH OKTION (315-a) for RACH retransmission and may wait for the subsequent RACH OKTION (315) for retransmission (e.g., when the UE (115) received the corresponding SSB (310).Additionally, failure to receive the RACH Msg2 (325) during the RAR window (320) may be due to problems in the channel (e.g., presence of interference, low signal-to-noise ratio (SNR), etc.). Since the same channel problems may persist with one or more retransmissions, repeating transmission using the SSB (310-b) and the corresponding RACH OKEN (315-b) may have a higher probability of failure than using different SSB (310) and RACH OKEN (315). By switching to different SSB (310)—and correspondingly different RACH OKEN (315)—the UE (115) may improve the likelihood of receiving the RACH Msg2 (325) transmission in response to the RACH message (e.g., due to different channel conditions).

[0102] Problems with tracking an SSB (310) (e.g., SSB (310-a)) associated with a receiving beam different from the RACH Msg2 (325) monitoring may persist along the RAR windows (320). For example, if the search space of RACH Msg 2 / 3 / 4 starts at the same symbol in each slot and an SSB (310) is transmitted at the same symbol in one or more slots without being QCLed with the DMRS of Msg 2 / 3 / 4, these time resources may overlap in each RAR window (320). Therefore, the UE (115) may not be able to track the initially selected SSB (310-b) and the SSBs (310) that are not QCLed during the entire retransmission process.

[0103] To address this issue, the search spaces of Msg 2 / 3 / 4 may be defined so as not to overlap the DMRS of Msg 2 / 3 / 4 with non-QCL SSBs. For example, the UE (115) may identify the SSBs (310) actually transmitted by the base station (105) and determine time resources for these SSBs (310). If the UE (115) selects an SSB (310) for RACH transmission, the UE (115) may identify time resources used for transmissions of non-QCL SSBs (310). For example, if the UE (115) selects an SSB (310-b), the UE (115) may identify time resources for transmissions of a non-QCL SSB (310-a). When the UE (115) determines a search space (e.g., default or configured search space) to monitor responses, the UE (115) may avoid overlapping the search space time resources with the identified non-QCL SSB (310) time resources. In this case, this may include identifying the search space (e.g., based on the priority level associated with the search space, the time resources, or both), and modifying the search space so as not to overlap with these time resources. For example, the UE (115) may change the slot periodicity of the search space or modify the search space at the symbol level. In a second case, this may include selecting a search space that does not overlap with the time resources for the identified non-QCL SSB (310).

[0104] In any of the cases described herein, by ensuring that the time resources of the search space and non-QCL SSBs (310) do not overlap, the UE (115) may monitor both the SSBs (310) and the RACH Msg2 (325) transmissions. For example, the UE (115) may monitor the RACH Msg2 (325) transmission and the SSB (310-b) using one receive beam at one time, or may switch to monitoring the SSB (310-a) using different receive beams at different times. This allows the UE (115) to perform retransmissions with reduced latency and improved reliability and enables the UE (115) to utilize the RAR window (320) efficiently.

[0105] FIG. 4 illustrates examples of possible multiplexing patterns (400) that support search space configurations for RACH messaging according to embodiments of the present disclosure. Possible multiplexing patterns (400) may be used by a base station (105) for transmission and by a UE (115) for reception as described herein with reference to FIGS. 1 through 3. Each pattern (405) illustrates an approximation of time (410) and frequency (415) resources used in an SS / PBCH block (420) (e.g., or any similar synchronization signals), a CORESET (425) (e.g., RMSI PDCCH transmitter), and a physical downlink shared channel (PDSCH) (430) (e.g., RMSI PDSCH transmitter). These are merely a few examples of possible multiplexing patterns (400), and other patterns (405) may be implemented.

[0106] Pattern (405-a) illustrates a TDM example. The SS / PBCH block (420), CORESET (425), and PDSCH (430) share frequency resources (415-a) (e.g., at least a subset of frequency resources) but utilize different time resources (410-a). In some cases, the UE (115) may select such a pattern for the RMSI search space CORESET so that the SS / PBCH block (420) and CORESET (425) do not overlap in the time resources (410-a). In these cases, the UE (115) may not be able to remove the time resources from the selected RMSI search space.

[0107] Pattern (405-b) exemplifies a combination of TDM and FDM examples. The SS / PBCH block (420) and PDSCH (430) may share time resources (410-b) (e.g., at least a subset of time resources) but utilize different frequency resources (415-b). Meanwhile, CORESET (425) may share frequency resources (415-b) with PDSCH (430) but may not share time resources (410-b), and may not share time or frequency resources with the SS / PBCH block (420). In this way, as in pattern (405-a), the UE (115) may select a CORESET (425) and an RMSI search space defined in this way to avoid the CORESET (425) and SS / PBCH block (420) overlapping in time resources (410-b).

[0108] Pattern (405-c) exemplifies a combination of TDM and FDM examples. CORESET (425) and PDSCH (430) may share frequency resources (415-c) rather than time resources (410-c). Meanwhile, SS / PBCH block (420) may share time resources (410-c) rather than frequency resources (415-c) with CORESET (425) and PDSCH (430). In such patterns (405), if the UE (115) selects an RMSI search space having a CORESET (425) defined by this expression, the UE (115) may identify non-QCL time resources (410-c) of the SSBs / PBCH of the SS / PBCH block (420) and remove these time resources (410-c) from the CORESET (425) (e.g., to avoid overlapping these time resources (410-c)).

[0109] If the UE (115) determines that a CORESET exists in the RMSI search space (e.g., Type0-PDCCH common search space), the UE (115) may determine the number of consecutive RBs and the number of consecutive symbols for the CORESET of the RMSI search space from a first set of bits (e.g., the four most significant bits of the RMSI PDCCH configuration), and may determine PDCCH monitoring occips from a second set of bits included in the master information block (MIB) (e.g., the four least significant bits of the RMSI PDCCH configuration). Tables 1 through 5 described below illustrate possible techniques for determining which occips to monitor based on specific parameters.

[0110]

[0111] Table 1: Parameters for PDCCH monitoring occupants for the Type0-PDCCH common search space - SS / PBCH block and CORESET multiplexing pattern (405-a) and FR1

[0112]

[0113] Table 2: Parameters for PDCCH Monitoring Occupations for the Type0-PDCCH Common Search Space - SS / PBCH Block and CORESET Multiplexing Pattern (405-a) and FR2

[0114]

[0115] Table 3: PDCCH Monitoring Occurrences for Type0-PDCCH Common Search Space - SS / PBCH Block and CORESET Multiplexing Pattern (405-b) and {SS / PBCH Block, PDCCH} Subcarrier Spacing {120, 60} kHz

[0116]

[0117] Table 4: PDCCH Monitoring Occurrences for Type0-PDCCH Common Search Space - SS / PBCH Block and CORESET Multiplexing Pattern (405-b) and {SS / PBCH Block, PDCCH} Subcarrier Spacing {240, 120} kHz

[0118]

[0119] Table 5: PDCCH Monitoring Occurrences for Type0-PDCCH Common Search Space - SS / PBCH Block and CORESET Multiplexing Pattern (405-c) and {SS / PBCH Block, PDCCH} Subcarrier Spacing {120, 120} kHz

[0120] In the tables above, SFN C and n Cis a slot index of the CORESET based on the subcarrier spacing of the SFN and CORESET, and the SS / PBCH block (420) having index i is the system frame SFN SSB,i and slot n SSB,i SFN when overlapping temporally SSB,i and n SSB,i is an SFN and slot index based on the subcarrier spacing of CORESET.

[0121] In some cases, the offset may be defined for the subcarrier interval of the CORESET up to the minimum RB index of the common RB that overlaps with the first RB of the SS / PBCH block (420).

[0122] For pattern (405-a), the UE (115) may monitor the PDCCH in the RMSI search space CORESET (425) across two consecutive slots starting from slot (n0), where As, SFN satisfying C Located in a frame having, It is located in a frame having an SFN satisfying . The values ​​for M and O can be found in Table 1 and Table 2, and μ∈{0,1,2,3} based on the subcarrier interval for PDCCH receptions in CORESET. Slot (n C The index for the first symbol of CORESET in ) may be the first symbol index provided in Table 1 and Table 2.

[0123] For patterns (405-b and 405-c), the UE (115) may monitor the PDCCH in the RMSI search space across a single slot with the same RMSI search space periodicity as the periodicity of the corresponding SS / PBCH block (420). For the SS / PBCH block (420) having index i, the UE (115) may, based on the parameters provided in Tables 3 through 5, monitor the slot index (n C ) and SFN C It may also be decided.

[0124] If the UE (115) detects the first SS / PBCH block (420) and determines that there is no CORESET (425) for the RMSI search space, and for specific frequency ranges (FRs) (e.g., 24≤k for FR1) SSB For FR2 ≤29 or 12≤k SSB For ≤13), UE (115) is As such, the global synchronization channel number (GSCN) of the second SS / PBCH block (420) having a CORESET for the associated RMSI search space may also be determined, where is the GSCN of the 1st SS / PBCH block (420) and is the GSCN offset provided in Tables 6 and 7 described below, where Table 6 corresponds to FR1 (e.g., 450 MHz to 6000 MHz) and Table 7 corresponds to FR2 (e.g., 24250 MHz to 52600 MHz).

[0125] If the UE (115) detects an SS / PBCH block (420) and determines that there is no CORESET for the RMSI search space, for specific FRs (e.g., for FR1 k SSB k for =31 or FR2 SSB =15), UE (115) is the GSCN range It may be determined that there are no SS / PBCH blocks with associated RMSI search spaces within, and here and is determined based on the first set of bits (e.g., 4 most significant bits) and the second set of bits (e.g., 4 least significant bits) of the RMSI PDCCH configuration, respectively.

[0126]

[0127] Table 6: For FR1 k for SSB Mapping between the combination of and RMSI PDCCH

[0128]

[0129] Table 7: For FR2 k for SSB Mapping between the combination of and RMSI PDCCH

[0130] FIG. 5 illustrates an example of a process flow (500) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The process flow (500) may include a base station (105-b) and a UE (115-b), which may be examples of devices described with reference to FIG. 1 and FIG. 2. The UE (115-b) may determine a search space for receiving downlink RACH messaging (e.g., PDCCH signals) based on SSB transmission timing. In some implementations, the processes described herein may differ in a different order or may include one or more additional or alternative processes performed by wireless devices.

[0131] In 505, the base station (105-b) may transmit a set of SSBs. The UE (115-b) may receive a set of SSBs and may select one SSB from the set of SSBs. In some cases, the UE (115-b) may receive different SSBs on different receiving beams based on whether the SSB transmissions are QCL. For example, the UE (115-b) may receive an SSB on a first receiving beam and may receive one or more other SSBs from the set of SSBs on receiving beams different from the first receiving beam. In 510, the UE (115-b) may transmit a first RACH message to the base station (105-b) based on the selected SSB. For example, the UE (115-b) may transmit a first RACH message at the RACH OK corresponding to the selected SSB.

[0132] In 515, the UE (115-b) and the base station (105-b) may identify a set of time resources used by the base station (105-b) for the transmission of one or more other SSBs. These other SSBs may be received by the UE (115-b) on receiving beams that may be different from the first receiving beam. The identified set of time resources may correspond to time resources used for SSBs that cannot be received by the UE (115-b) on the same beam as the selected SSB.

[0133] In 520, the UE (115-b) and the base station (105-b) may identify a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. For example, the search space may not include any time resources that overlap with the set of identified time resources. In some cases, the search space may be an example of a modified RMSI search space indicated through the PBCH configuration, wherein the RMSI search space may be modified to remove resources that temporally overlap with the set of identified time resources. In other cases, the search space may be an example of an effective RMSI search space that does not overlap with the set of identified time resources (e.g., not indicated through the PBCH configuration). For example, the search space may use a pattern in which the PDCCH CORESET does not TDM with the synchronization signals. In other cases, the UE (115-b) may receive a configuration for the search space and remove time resources that do not overlap with the set of identified time resources from the configured search space. In any of these cases, the resulting search space used to monitor the transmissions may not overlap temporally with non-QCL SSB transmissions.

[0134] In 525, the base station (105-b) may map a PDCCH message to CCEs within an identified search space. This PDCCH message may be an example of a PDCCH grant for RACH Msg 2 / 3 / 4. In 530, the UE (115-b) may monitor the search space for transmitting a PDCCH message. The UE (115-b) may monitor the transmission using a first receive beam (e.g., a receive beam used to receive a selected SSB).

[0135] At 535, the base station (105-b) may transmit a PDCCH message to the UE (115-b) according to the mapping. In some cases, the base station (105-b) may retransmit a set of SSBs at 540. The UE (115-b) may receive non-QCL SSBs based on switching the receive beams. For example, the UE (115-b) may receive transmissions using a first receive beam during the time resources of the search space, or receive transmissions using different receive beams during a set of identified time resources for non-QCL SSBs. When the UE (115-b) receives a PDCCH message (e.g., in response to a first RACH message during the receive window), the UE (115-b) may perform additional RACH procedures. If UE (115-b) does not receive a PDCCH message, UE (115-b) may perform a retransmission process (e.g., using the same SSB, or using an additional received SSB, such as one of the non-QCL SSBs).

[0136] FIG. 6 illustrates a block diagram (600) of a window device (605) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The wireless device (605) may be an example of embodiments of the UE (115) as described herein. The wireless device (605) may include a receiver (610), a UE search space module (615), and a transmitter (620). The wireless device (605) may also include a processor. Each of these components may be in a state of communication with one another (e.g., via one or more buses).

[0137] The receiver (610) may receive information such as packets associated with various information channels, user data, or control information (e.g., information related to control channels, data channels, and search space configurations for RACH messaging). The information may be transmitted to other components of the device. The receiver (610) may be an example of the embodiments of the transceiver (935) described with reference to FIG. 9. The receiver (610) may utilize a single antenna or a set of antennas.

[0138] The UE search space module (615) may be an example of an embodiment of the UE search space module (915) described with reference to FIG. 9.

[0139] At least some of the UE search space module (615) and / or its various sub-components may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions of at least some of the UE search space module (615) and / or its various sub-components may be implemented by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure. At least some of the UE search space module (615) and / or its various sub-components may be physically located in various locations, including distributed so that parts of the functions are implemented by one or more physical devices in different physical locations. In some examples, at least some of the UE search space module (615) and / or its various sub-components may be separate, distinct components according to various aspects of the present disclosure. In other examples, at least some of the UE search space module (615) and / or its various sub-components may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in the present disclosure, or combinations thereof according to various aspects of the present disclosure.

[0140] The UE search space module (615) transmits a first RACH message to a base station based on an SSB received by the UE on a first receiving beam, identifies a set of time resources used by the base station for transmitting one or more other SSBs from the base station, identifies a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources, and may monitor the PDCCH message in the identified search space.

[0141] The transmitter (620) may transmit signals generated by other components of the device. In some examples, the transmitter (620) may be juxtaposed with the receiver (610) in the transceiver module. For example, the transmitter (620) may be an example of an embodiment of the transceiver (935) described with reference to FIG. 9. The transmitter (620) may utilize a single antenna or a set of antennas.

[0142] FIG. 7 illustrates a block diagram (700) of a window device (705) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The wireless device (705) may be an example of an embodiment of the wireless device (605) or UE (115) described with reference to FIG. 6. The wireless device (705) may include a receiver (710), a UE search space module (715), and a transmitter (720). The wireless device (705) may also include a processor. Each of these components may be in a state of communication with one another (e.g., via one or more buses).

[0143] The receiver (710) may receive information such as packets associated with various information channels, user data, or control information (e.g., information related to control channels, data channels, and search space configurations for RACH messaging). The information may be transmitted to other components of the device. For example, the receiver (710) may be an example of an embodiment of the transceiver (935) described with reference to FIG. 9. The receiver (710) may utilize a single antenna or a set of antennas.

[0144] The UE search space module (715) may be an example of an embodiment of the UE search space module (915) described with reference to FIG. 9. The UE search space module (715) may also include a transmission component (725), a time resource identifier (730), a search space identifier (735), and a monitoring component (740).

[0145] The transmitting component (725) may transmit a first RACH message to a base station based on an SSB received by a UE on a first receiving beam. The time resource identifier (730) may identify a set of time resources used by a base station for transmitting one or more other SSBs from the base station. The search space identifier (735) may identify a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. The monitoring component (740) may monitor the PDCCH message in the identified search space.

[0146] The transmitter (720) may transmit signals generated by other components of the device. In some examples, the transmitter (720) may be juxtaposed with the receiver (710) in the transceiver module. For example, the transmitter (720) may be an example of an embodiment of the transceiver (935) described with reference to FIG. 9. The transmitter (720) may utilize a single antenna or a set of antennas.

[0147] FIG. 8 illustrates a block diagram (800) of a UE search space module (815) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The UE search space module (815) may be an example of embodiments of the UE search space module (615), UE search space module (715), or UE search space module (915) described with reference to FIG. 6, FIG. 7 and FIG. 9. The UE search space module (815) may include a transmitting component (820), a time resource identifier (825), a search space identifier (830), a monitoring component (835), a search space configuration component (840), a receiving component (845), and a beam selection component (850). Each of these modules may communicate directly or indirectly with one another (e.g., via one or more buses).

[0148] The transmitting component (820) may also transmit a first RACH message to the base station based on the SSB received by the UE (115) on the first receiving beam.

[0149] The time resource identifier (825) may identify a set of time resources used by the base station for the transmission of one or more other SSBs from the base station. In some cases, one or more other SSBs are received by the UE (115) on receiving beams different from the first receiving beam. In some cases, one or more other SSBs are examples of one or more SSBs actually transmitted by the base station. In some cases, the time resource identifier (825) may receive from the base station an indication of one or more SSBs actually transmitted by the base station in the form of an RMSI, other system information (OSI), an RRC message, a MAC CE, a handover message, or a combination thereof. In some cases, the locations of one or more other SSBs may be fixed.

[0150] The search space identifier (830) may identify a search space for receiving a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. In some cases, the search space identifier (830) may identify an RMSI search space corresponding to an SSB and configured through a PBCH configuration, and identifying the search space may further include removing time resources that overlap with the set of identified time resources from the identified RMSI search space, wherein the identified search space includes the remaining time resources of the identified RMSI search space. In some cases, removing time resources from the identified RMSI search space includes changing the slot-level periodicity of the identified RMSI search space, and the identified search space includes the same symbol index locations as the identified RMSI search space but has the changed slot-level periodicity of the identified RMSI search space. In some cases, identifying a search space may further include determining to implement a default search space based on RMSI transmission from a base station, and identifying monitoring circles for monitoring PDCCH messages based on monitoring circles of the RMSI search space. In some cases, identifying a search space may further include identifying an RMSI search space having time resources that do not overlap with the set of identified time resources, wherein the identified search space includes the identified RMSI search space. In some cases, identifying a search space may further include identifying the start of a search space based on transmitting a first RACH message and identifying the end of a search space based on a response timer. In some cases, the response timer includes a RAR window, a contention resolution timer, or a combination thereof.

[0151] The monitoring component (835) may monitor PDCCH messages in the identified search space. In some cases, the beam selection component (850) may select a first receiving beam, and the identified search space is monitored using the first receiving beam selected during time resources that may be different from the set of identified time resources. In some cases, the beam selection component (850) may additionally select a second receiving beam different from the selected first receiving beam. The monitoring component (835) may monitor at least one of one or more other SSBs using the second receiving beam selected during the set of identified time resources. In some cases, the PDCCH message is an example of a PDCCH grant for sending RACH Msg2, a PDCCH grant for sending RACH Msg3, a PDCCH grant for sending RACH Msg4, or a combination thereof.

[0152] The search space configuration component (840) may receive from the base station a representation of a set of time resources for the search space, and may remove time resources from a set of time resources identified from a representation of time resources for the search space, wherein the identified search space includes the remaining time resources of a representation of a set of time resources for the search space. In some cases, the representation of a set of time resources for the search space includes a time window for the search space. In some cases, a subset of slots of the time window includes the identified search space. In some cases, a subset of slots includes each slot of the time window.

[0153] In some cases, the receiving component (845) may receive an SSB from the base station, and a first RACH message is transmitted from the RACH OKEN corresponding to the SSB. Additionally or alternatively, the receiving component (845) may receive at least one of one or more other SSBs from the base station based on the fact that the time resources for the identified search space do not overlap with the set of identified time resources. In some cases, the receiving component (845) may receive a PDCCH message from the CCEs of the identified search space based on monitoring.

[0154] FIG. 9 illustrates a block diagram of a system (900) comprising a device (905) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The device (905) may be, for example, an example of a component of a wireless device (605), a wireless device (705), or a UE (115) as described herein with reference to FIG. 6 and FIG. 7, or may include such components. The device (905) may include components for bidirectional voice and data communication, including a UE search space module (915), a processor (920), a memory (925), software (930), a transceiver (935), an antenna (940), and an I / O controller (945), for transmitting and receiving communications. These components may communicate electronically through one or more buses (e.g., bus (910)). The device (905) may also communicate wirelessly with one or more base stations (105).

[0155] The processor (920) may include intelligent hardware devices (e.g., a general-purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a PLD, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor (920) may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor (920). The processor (920) may be configured to execute computer-readable instructions stored in memory to perform various functions (e.g., functions or tasks that support search space configurations for RACH messaging).

[0156] Memory (925) may include random access memory (RAM) and read-only memory (ROM). Memory (925) may store computer-readable, computer-executable software (930) containing instructions, which, when executed, cause the processor to perform the various functions described herein. In some cases, memory (925) may include a basic I / O system (BIOS) that may control basic hardware or software operations, such as interactions with peripheral components or devices, among other things.

[0157] Software (930) may include code for implementing aspects of the present disclosure, including code for supporting the configuration of a search space for RACH messaging. Software (930) may be stored in a non-transient computer-readable medium, such as system memory or other memory. In some cases, software (930) may not be directly executable by a processor, but may enable a computer to perform the functions described herein (e.g., when compiled and executed).

[0158] The transceiver (935) may communicate bidirectionally through one or more antennas, wired or wireless links, as described herein. For example, the transceiver (935) may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver (935) may include a modem configured to modulate packets, provide the modulated packets to antennas for transmission, and demodulate packets received from the antennas.

[0159] In some cases, the wireless device may include a single antenna (940). However, in some cases, the device may have more than one antenna (940) capable of simultaneously transmitting or receiving multiple wireless transmissions.

[0160] The I / O controller (945) may manage input and output signals for the device (905). The I / O controller (945) may also manage peripheral devices that are not integrated into the device (905). In some cases, the I / O controller (945) may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller (945) may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or other known operating systems. In other cases, the I / O controller (945) may represent a modem, keyboard, mouse, touchscreen, or similar device and interact with them. In some cases, the I / O controller (945) may be implemented as part of a processor. In some cases, the user can interact with the device (905) through the I / O controller (945) or through a hardware component controlled by the I / O controller (945).

[0161] FIG. 10 illustrates a block diagram (1000) of a window device (1005) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The wireless device (1005) may be an example of embodiments of a base station (105) as described herein. The wireless device (1005) may include a receiver (1010), a base station search space module (1015), and a transmitter (1020). The wireless device (1005) may also include a processor. Each of these components may be in a state of communication with one another (e.g., via one or more buses).

[0162] The receiver (1010) may receive information such as packets associated with various information channels, user data, or control information (e.g., information related to control channels, data channels, and search space configurations for RACH messaging). The information may be transmitted to other components of the device. For example, the receiver (1010) may be an example of an embodiment of the transceiver (1335) described with reference to FIG. 13. The receiver (1010) may utilize a single antenna or a set of antennas.

[0163] The base station search space module (1015) may be an example of an embodiment of the base station search space module (1315) described with reference to FIG. 13.

[0164] At least some of the base station search space module (1015) and / or its various sub-components may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions of at least some of the base station search space module (1015) and / or its various sub-components may be implemented by a general-purpose processor, DSP, ASIC, FPGA or other PLD, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure. At least some of the base station search space module (1015) and / or its various sub-components may be physically located in various locations, including distributed so that parts of the functions are implemented by one or more physical devices in different physical locations. In some examples, at least some of the base station search space module (1015) and / or its various sub-components may be separate, distinct components according to various aspects of this disclosure. In other examples, at least some of the base station search space module (1015) and / or various sub-components thereof may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof according to various aspects of this disclosure.

[0165] The base station search space module (1015) receives a first RACH message from the UE (115) based on an SSB received by the UE (115) on a first receiving beam, identifies a set of time resources used for the transmission of one or more other SSBs by the base station, and may identify a search space for the UE (115) to receive a PDCCH message based on the first RACH message, and the identified search space includes time resources different from the set of identified time resources. The base station search space module (1015) may additionally map the PDCCH message to CCEs within the identified search space and transmit the PDCCH message to the UE according to the mapping.

[0166] The transmitter (1020) may transmit signals generated by other components of the device. In some examples, the transmitter (1020) may be juxtaposed with the receiver (1010) in a transceiver module. For example, the transmitter (1020) may be an example of an embodiment of the transceiver (1335) described with reference to FIG. 13. The transmitter (1020) may utilize a single antenna or a set of antennas.

[0167] FIG. 11 illustrates a block diagram (1100) of a window device (1105) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The wireless device (1105) may be an example of an embodiment of the wireless device (1005) or base station (105) described with reference to FIG. 10. The wireless device (1105) may include a receiver (1110), a base station search space module (1115), and a transmitter (1120). The wireless device (1105) may also include a processor. Each of these components may be in a state of communication with one another (e.g., via one or more buses).

[0168] The receiver (1110) may receive information such as packets associated with various information channels, user data, or control information (e.g., information related to control channels, data channels, and search space configurations for RACH messaging). The information may be transmitted to other components of the device. For example, the receiver (1110) may be an example of an embodiment of the transceiver (1335) described with reference to FIG. 13. The receiver (1110) may utilize a single antenna or a set of antennas.

[0169] The base station search space module (1115) may be an example of an embodiment of the base station search space module (1315) described with reference to FIG. 13. The base station search space module (1115) may also include a transmitting component (1125), a time resource identifier (1130), a search space identifier (1135), a mapping component (1140), and a transmitting component (1145).

[0170] The receiving component (1125) may receive a first RACH message from the UE (115) based on an SSB received by the UE (115) on a first receiving beam. The time resource identifier (1130) may identify a set of time resources used for the transmission of one or more other SSBs by the base station. In some cases, one or more other SSBs are received by the UE (115) on receiving beams different from the first receiving beam. The search space identifier (1135) may identify a search space for the UE (115) to receive a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. The mapping component (1140) may map the PDCCH message to CCEs within the identified search space. The transmitting component (1145) may transmit the PDCCH message to the UE according to the mapping.

[0171] The transmitter (1120) may transmit signals generated by other components of the device. In some examples, the transmitter (1120) may be juxtaposed with the receiver (1110) in a transceiver module. For example, the transmitter (1120) may be an example of an embodiment of the transceiver (1335) described with reference to FIG. 13. The transmitter (1120) may utilize a single antenna or a set of antennas.

[0172] FIG. 12 illustrates a block diagram (1200) of a base station search space module (1215) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The base station search space module (1215) may be an example of embodiments of the base station search space module (1315) described with reference to FIG. 10, FIG. 11, and FIG. 13. The base station search space module (1215) may also include a receiving component (1220), a time resource identifier (1225), a search space identifier (1230), a mapping component (1235), a transmitting component (1240), and a search space configuration component (1245). Each of these modules may communicate directly or indirectly with one another (e.g., through one or more buses).

[0173] The receiving component (1220) may also receive a first RACH message from the UE (115) based on the SSB received by the UE (115) on the first receiving beam.

[0174] The time resource identifier (1225) may identify a set of time resources used for the transmission of one or more other SSBs by the base station. In some cases, one or more other SSBs are received by the UE (115) on receiving beams different from the first receiving beam.

[0175] The search space identifier (1230) may identify a search space for the UE (115) to receive a PDCCH message based on the first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. In some cases, the search space identifier (1230) may identify an RMSI search space that corresponds to an SSB and is configured through a PBCH configuration. In some cases, identifying a search space further includes removing time resources from the identified RMSI search space that overlap with the set of identified time resources, wherein the identified search space includes the remaining time resources of the identified RMSI search space. In some cases, removing time resources from the identified RMSI search space includes changing the slot-level periodicity of the identified RMSI search space, wherein the identified search space includes the same symbol index locations as the identified RMSI search space but has the changed slot-level periodicity of the identified RMSI search space. In other cases, identifying a search space further involves identifying an RMSI search space having time resources that do not overlap with the set of identified time resources, wherein the identified search space includes the identified RMSI search space.

[0176] The mapping component (1235) may map PDCCH messages to CCEs within the identified search space.

[0177] The transmitting component (1240) may transmit a PDCCH message to the UE according to the mapping. In some cases, the transmitting component (1240) may transmit an SSB to the UE, and the first RACH message is received at the RACH OKEN corresponding to the SSB. In some cases, the PDCCH message is an example of a PDCCH grant for transmitting RACH Msg2, a PDCCH grant for transmitting RACH Msg3, a PDCCH grant for transmitting RACH Msg4, or a combination thereof.

[0178] The search space configuration component (1245) may transmit to the UE a representation of a set of time resources for the search space, and may remove time resources of the set of time resources identified from the represented set of time resources for the search space, wherein the identified search space includes the remaining time resources of the represented set of time resources for the search space. In some cases, the representation of a set of time resources for the search space includes a time window for the search space. In some cases, a subset of slots of the time window includes the identified search space. In some cases, a subset of slots includes each slot of the time window.

[0179] FIG. 13 illustrates a block diagram of a system (1300) including a device (1305) that supports search space configurations for RACH messaging according to embodiments of the present disclosure. The device (1305) may be an example of components of a base station (105) as described herein with reference to FIG. 1, for example, or may include such components. The device (1305) may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a base station search space module (1315), a processor (1320), memory (1325), software (1330), a transceiver (1335), an antenna (1340), a network communication manager (1345), and an inter-station communication manager (1350). These components may communicate electronically through one or more buses (e.g., bus (1310)). The device (1305) may also communicate wirelessly with one or more UEs (115).

[0180] The processor (1320) may include intelligent hardware devices (e.g., general-purpose processor, DSP, CPU, microcontroller, ASIC, FPGA, PLD, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor (1320) may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor (1320). The processor (1320) may be configured to execute computer-readable instructions stored in memory to perform various functions (e.g., functions or tasks that support search space configurations for RACH messaging).

[0181] Memory (1325) may include RAM and ROM. Memory (1325) may store computer-readable, computer-executable software (1330) containing instructions, which, when executed, cause the processor to perform the various functions described herein. In some cases, memory (1325) may include a BIOS that, among others, may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0182] Software (1330) may include code for implementing aspects of the present disclosure, including code for supporting the configuration of a search space for RACH messaging. Software (1330) may be stored in a non-transient computer-readable medium, such as system memory or other memory. In some cases, software (1330) may not be directly executable by a processor, but may enable a computer to perform the functions described herein (e.g., when compiled and executed).

[0183] The transceiver (1335) may communicate bidirectionally through one or more antennas, wired or wireless links, as described herein. For example, the transceiver (1335) may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver (1335) may include a modem configured to modulate packets, provide the modulated packets to antennas for transmission, and demodulate packets received from the antennas.

[0184] In some cases, the wireless device may include a single antenna (1340). However, in some cases, the device may have more than one antenna (1340) capable of simultaneously transmitting or receiving multiple wireless transmissions.

[0185] The network communication manager (1345) may manage communication with the core network (130) (e.g., through one or more wired backhaul links). For example, the network communication manager (1345) may manage the transmission of data communications to client devices such as one or more UEs (115).

[0186] The inter-station communication manager (1350) may manage communication with other base stations (105) and may include a controller or scheduler to control communication with UEs (115) in cooperation with other base stations (105). For example, the inter-station communication manager (1350) may coordinate the scheduling of transmissions to UEs (115) for various interference mitigation techniques such as beamforming or co-transmission. In some examples, the base station communication manager (1350) may provide an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between base stations (105).

[0187] FIG. 14 illustrates a flowchart illustrating a method (1400) for configurations of search spaces for RACH messaging according to embodiments of the present disclosure. Operations of the method (1400) may be implemented by a UE (115) or its components as described herein. For example, operations of the method (1400) may be performed by a UE search space module as described with reference to FIGS. 6 through 9. In some examples, the UE (115) may execute a set of codes to control functional elements of the device to perform the functions described herein. Additionally or alternatively, the UE (115) may use special-purpose hardware to perform embodiments of the functions described herein.

[0188] In 1405, the UE (115) may transmit a first RACH message to a base station based on an SSB received by the UE (115) on a first receiving beam. The operations of 1405 may be performed according to the methods described herein. In certain examples, modes of the operations of 1405 may be performed by a transmitting component such as that described with reference to FIGS. 6 through 9.

[0189] In 1410, the UE (115) may identify a set of time resources used by the base station for the transmission of one or more other SSBs from the base station. The operations of 1410 may be performed according to the methods described herein. In certain examples, modes of the operations of 1410 may be performed by a time resource identifier such as that described with reference to FIGS. 6 through 9.

[0190] In 1415, the UE (115) may identify a search space for receiving a PDCCH message based on a first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. The operations of 1415 may be performed according to the methods described herein. In certain examples, modes of the operations of 1415 may be performed by a search space identifier as described with reference to FIGS. 6 through 9.

[0191] In 1420, the UE (115) may monitor PDCCH messages in the identified search space. The operations of 1420 may be performed according to the methods described herein. In certain examples, modes of the operations of 1420 may be performed by a monitoring component such as that described with reference to FIGS. 6 through 9.

[0192] FIG. 15 illustrates a flowchart illustrating a method (1500) for configurations of search spaces for RACH messaging according to embodiments of the present disclosure. Operations of the method (1500) may be implemented by a UE (115) or its components as described herein. For example, operations of the method (1500) may be performed by a UE search space module as described with reference to FIGS. 6 through 9. In some examples, the UE (115) may execute a set of codes to control functional elements of the device to perform the functions described herein. Additionally or alternatively, the UE (115) may use special-purpose hardware to perform embodiments of the functions described herein.

[0193] In 1505, the UE (115) may transmit a first RACH message to a base station based on an SSB received by the UE (115) on a first receiving beam. The operations of 1505 may be performed according to the methods described herein. In certain examples, modes of the operations of 1505 may be performed by a transmitting component such as that described with reference to FIGS. 6 through 9.

[0194] In 1510, the UE (115) may identify a set of time resources used by the base station for the transmission of one or more other SSBs from the base station. The operations of 1510 may be performed according to the methods described herein. In certain examples, modes of the operations of 1510 may be performed by a time resource identifier such as that described with reference to FIGS. 6 through 9.

[0195] In 1515, the UE (115) may identify a search space for receiving a PDCCH message based on a first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. The operations of 1515 may be performed according to the methods described herein. In certain examples, modes of the operations of 1515 may be performed by a search space identifier as described with reference to FIGS. 6 through 9.

[0196] In 1520, the UE (115) may select a first receiving beam. The operations of 1520 may be performed according to the methods described herein. In certain examples, modes of the operations of 1520 may be performed by a beam selection component such as that described with reference to FIGS. 6 through 9.

[0197] In 1525, the UE (115) may monitor PDCCH messages in an identified search space, and the identified search space is monitored using a first receiving beam selected during time resources that may be different from the set of identified time resources. The operations of 1525 may be performed according to the methods described herein. In certain examples, modes of the operations of 1525 may be performed by a monitoring component such as that described with reference to FIGS. 6 through 9.

[0198] In 1530, the UE (115) may select a second receiving beam different from the selected first receiving beam. The operations of 1530 may be performed according to the methods described herein. In certain examples, modes of the operations of 1530 may be performed by a beam selection component such as that described with reference to FIGS. 6 through 9.

[0199] In 1535, the UE (115) may monitor at least one of one or more other SSBs using a selected second receiving beam during a set of identified time resources. The operations of 1535 may be performed according to the methods described herein. In certain examples, modes of the operations of 1535 may be performed by a monitoring component such as that described with reference to FIGS. 6 through 9.

[0200] FIG. 16 illustrates a flowchart illustrating a method (1600) for configurations of search spaces for RACH messaging according to embodiments of the present disclosure. Operations of the method (1600) may be implemented by a base station (105) or its components as described herein. For example, operations of the method (1600) may be performed by a base station search space module as described with reference to FIGS. 10 through 13. In some examples, the base station (105) may execute a set of codes to control functional elements of a device to perform the functions described herein. Additionally or alternatively, the base station (105) may use special-purpose hardware to perform embodiments of the functions described herein.

[0201] In 1605, the base station (105) may receive a first RACH message from the UE (115) based on an SSB received by the UE (115) on a first receiving beam. The operations of 1605 may be performed according to the methods described herein. In certain examples, modes of the operations of 1605 may be performed by a receiving component such as that described with reference to FIGS. 10 through 13.

[0202] In 1610, the base station (105) may identify a set of time resources used for the transmission of one or more other SSBs by the base station (105). The operations of 1610 may be performed according to the methods described herein. In certain examples, modes of the operations of 1610 may be performed by a time resource identifier such as that described with reference to FIGS. 10 through 13.

[0203] In 1615, the base station (105) may identify a search space for the UE (115) to receive a PDCCH message based on a first RACH message, wherein the identified search space includes time resources different from the set of identified time resources. The operations of 1615 may be performed according to the methods described herein. In certain examples, modes of the operations of 1615 may be performed by a search space identifier as described with reference to FIGS. 10 through 13.

[0204] In 1620, the base station (105) may map PDCCH messages to CCEs within an identified search space. The operations of 1620 may be performed according to the methods described herein. In certain examples, modes of the operations of 1620 may be performed by a mapping component such as that described with reference to FIGS. 10 through 13.

[0205] In 1625, the base station (105) may transmit a PDCCH message to the UE (115) according to the mapping. The operations of 1625 may be performed according to the methods described herein. In certain examples, modes of the operations of 1625 may be performed by a transmitting component such as that described with reference to FIGS. 10 through 13.

[0206] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Additionally, embodiments from two or more of the methods may be combined.

[0207] The techniques described herein may 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. CDMA systems may implement wireless technologies such as CDMA2000 and UTRA (Universal Terrestrial Radio Access). CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 releases may be collectively referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is collectively referred to as CDMA2000 1xEV-DO, HRPD (High Rate Packet Data), etc. UTRA includes Wideband CDMA (WCDMA) and other variations of CDMA. The TDMA system can also implement wireless technologies such as the Global System for Mobile Communications (GSM).

[0208] OFDMA systems may also implement wireless technologies such as UMB (Ultra Mobile Broadband), E-UTRA, IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in literature from an organization named the "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in literature from an organization named 3GPP2 ("3rd Generation Partnership Project 2"). The techniques described herein may be used for systems and wireless technologies other than those mentioned herein. Although embodiments of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes and the terms LTE, LTE-A, LTE-A Pro, or NR may be used throughout most of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR applications.

[0209] Macro cells generally cover a relatively large geographical area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs (115) with service subscriptions to a network provider. Small cells may be associated with a low-power base station (105) compared to macro cells, and small cells may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Small cells may include pico cells, femto cells, and micro cells depending on various examples. Pico cells may cover a small geographical area, for example, and may allow unrestricted access by UEs (115) with service subscriptions to a network provider. A femto cell may also cover a small geographical area (e.g., a home) and provide limited access by UEs (115) associated with the femto cell (e.g., UEs (115) within a CSG (Closed Subscriber Group), UEs (115) for users within the home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, pico eNB, femto eNB, or home eNB. An eNB may support one or more cells (e.g., two, three, four, etc.) and may also support communications using one or more CCs.

[0210] The wireless communication system (100) or systems described herein may support synchronous or asynchronous operation. For synchronous operation, base stations (105) may have similar frame timings, and transmissions from different base stations (105) may be roughly aligned in time. For asynchronous operation, base stations (105) may have different frame timings, and transmissions from different base stations (105) may not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operation.

[0211] The information and signals described herein may be represented using any of the various different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0212] The various exemplary blocks and modules described in connection with the disclosure herein may be implemented or performed by a general-purpose processor, DSP, ASIC, FPGA or other PLD, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0213] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored on or transmitted through a computer-readable medium as one or more instructions or code. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of the software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions may also be physically located at various positions, including distributed so that parts of the functions are implemented at different physical locations.

[0214] Computer-readable media include both communication media and non-transient computer storage media, which include any medium that facilitates the transfer of a computer program from one place to another. A non-transient storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer. By example, but not by limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable read-only memory (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disc storage or other magnetic storage devices, or any other non-transient medium that can be used to record or store desired program code means in the form of instructions or data structures and can be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Additionally, any connection is appropriately named as a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of a medium. As used herein, disk and disc include CD, laser disc, optical disc, digital multifunction disc (DVD), floppy disc, and Blu-ray disc, wherein disks typically reproduce data magnetically, while discs reproduce data optically using lasers. The above combinations are also included within the scope of computer-readable media.

[0215] As used herein, including in the claims, the word “or” as used in a list of items (e.g., a list of items beginning with phrases such as “at least one of” or “one or more of”) indicates a comprehensive 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, B, and C). Additionally, as used herein, the phrase “based on” should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as “based on Condition A” may be based on both Condition A and Condition B without departing from the scope of the disclosure. That is, as used herein, the phrase “based on” should be interpreted in the same way as the phrase “at least partially based on”.

[0216] In the attached drawings, similar components or features may have the same reference label. Additionally, various components of the same type may be distinguished by having a dash and a second label that distinguishes between similar components following the reference label. If only the first reference label is used herein, the description is applicable to any component among similar components having the same first reference label, regardless of the second reference label or other subsequent reference levels.

[0217] The description provided herein in connection with the accompanying drawings describes exemplary configurations and does not represent all examples that may be implemented or are within the scope of the claims. As used herein, the term “exemplary” means “serving as an example, case, or example” and does not mean that it is “preferably” or “advantageous” over other examples. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, widely known structures and devices are illustrated in block diagram form to avoid obscuring the concepts of the described examples.

[0218] The description herein is provided to enable those skilled in the art to practice and use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Accordingly, the present disclosure is not limited to the examples and designs described herein, but is consistent with the broadest scope of the principles and novel features disclosed herein.

Claims

Claim 1 User equipment (UE) comprising: one or more memories storing processor-executable code; and one or more processors coupled to said one or more memories, said one or more processors capable of individually or collectively operating to execute code that enables the UE to: receive a synchronization signal block (SSB) through the receiving beam of said UE; transmit a random access (RACH) message based at least partially on said SSB received through said receiving beam of said UE; and monitor one or more monitoring circles of a Type0 Physical Downlink Control Channel (Type0-PDCCH) common search space across two consecutive slots for a Physical Downlink Control Channel (PDCCH) message in the search space, said Type0-PDCCH common search space corresponds to said SSB and is configured via a Physical Broadcast Channel (PBCH) configuration, said start of said search space is based at least partially on said RACH message, and said end of said search space is based at least partially on a response timer. Claim 2 User equipment according to claim 1, wherein the PDCCH message comprises a PDCCH grant for transmitting a RACH message 2 (Msg2), a PDCCH grant for transmitting a RACH message 3 (Msg3), a PDCCH grant for transmitting a RACH message 4 (Msg4), or a combination thereof. Claim 3 In claim 1, the one or more processors are individually or collectively operable to enable the UE to also: execute code that allows one or more other SSBs to be received through one or more second receiving beams different from the receiving beam, user equipment. Claim 4 In claim 1, the PBCH configuration represents a residual minimum system information (RMSI) search space corresponding to the SSB, a user device. Claim 5 In claim 4, one or more time resources are removed from the RMSI search space that overlaps with a set of time resources associated with one or more other SSBs, and the search space comprises the remaining time resources of the RMSI search space based on the removal of the one or more time resources, user equipment. Claim 6 In claim 5, the user equipment wherein the search space includes the same symbol index locations as the RMSI search space but has a modified slot-level periodicity different from the slot-level periodicity of the RMSI search space. Claim 7 In claim 4, the one or more processors are individually or collectively operable to enable the UE to also: receive an RMSI transmission associated with a default search space, wherein monitoring for the PDCCH message is at least partially based on one or more second monitoring occupations of the RMSI search space, said RMSI transmission receiving code that is executable. Claim 8 A user device according to claim 1, wherein the search space comprises a residual minimum system information (RMSI) search space having time resources that do not overlap with a set of time resources associated with one or more other SSBs. Claim 9 A user device capable of operating individually or collectively to enable the execution of code that enables the UE to receive a first set of time resources for the search space, wherein one or more time resources of a second set of time resources associated with one or more other SSBs are removed from the first set of time resources for the search space, and the search space comprises the remaining time resources of the first set of time resources for the search space based on the removal of the one or more time resources of the second set of time resources. Claim 10 In claim 9, the first set of indications of time resources for the search space comprises a time window for the search space, and a subset of slots of the time window comprises the search space, user equipment. Claim 11 In claim 10, the user equipment, wherein a subset of the slots comprises each slot of the time window. Claim 12 delete Claim 13 In claim 1, the response timer comprises a random access response (RAR) window, a contention resolution timer, or a combination thereof, user equipment. Claim 14 In claim 1, the RACH message is transmitted from the RACH OK corresponding to the SSB, the user equipment. Claim 15 In claim 1, the search space is monitored using the receiving beam during time resources different from the set of time resources associated with one or more other SSBs, and at least one of the one or more other SSBs is received through a second receiving beam different from the receiving beam during the set of time resources, user equipment. Claim 16 In claim 15, the one or more processors are individually or collectively operable to enable the UE to also: receive at least one SSB among the one or more other SSBs based at least partially on the fact that the time resources for the search space do not overlap with the set of time resources associated with the one or more other SSBs, user equipment. Claim 17 In claim 1, the one or more processors are individually or collectively operable to enable the UE to also: execute code that receives the PDCCH message from one or more control channel elements (CCEs) of the search space based at least partially on the monitoring. Claim 18 In claim 1, the user equipment comprising one or more other SSBs associated with a set of time resources, including one or more SSBs actually transmitted by a network entity. Claim 19 In claim 18, the one or more processors are user equipment capable of operating individually or collectively to execute code that enables the UE to also: receive a representation of the one or more SSBs actually transmitted by a network entity through a Minimum System Information (RMSI), other System Information (OSI), Radio Resource Control (RRC) message, Media Access Control (MAC) control element (CE), handover message, or a combination thereof. Claim 20 A method for wireless communication in a user device (UE), comprising: receiving a synchronization signal block (SSB) through a receiving beam of the UE; transmitting a random access (RACH) message at least partially based on the SSB received through the receiving beam of the UE; and monitoring one or more monitoring circles of a Type0 physical downlink control channel (Type0-PDCCH) common search space across two consecutive slots for a physical downlink control channel (PDCCH) message in a search space, wherein the Type0-PDCCH common search space corresponds to the SSB and is configured through a physical broadcast channel (PBCH) configuration, the start of the search space is at least partially based on the RACH message, and the end of the search space is at least partially based on a response timer. Claim 21 A device for wireless communication in a network entity, comprising: one or more memories; and one or more processors coupled to the one or more memories, wherein the processors: transmit a synchronization signal block (SSB) associated with a receiving beam of a user equipment (UE); receive a random access (RACH) message based at least partially on the SSB associated with the receiving beam of the UE; and transmit a physical downlink control channel (PDCCH) message associated with a search space based on one or more monitoring occupants of a Type0 physical downlink control channel (Type0-PDCCH) common search space spanning two consecutive slots, wherein the Type0-PDCCH common search space corresponds to the SSB and is configured through a physical broadcast channel (PBCH) configuration, the start of the search space is based at least partially on the RACH message, and the end of the search space is based at least partially on a response timer.

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