WO2022016521A1

WO2022016521A1 - Search space configuration for new radio multicast

Info

Publication number: WO2022016521A1
Application number: PCT/CN2020/104486
Authority: WO
Inventors: Min Huang; Chao Wei; Qiaoyu Li
Original assignee: Qualcomm Incorporated
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2022-01-27

Abstract

Wireless communications systems and methods related to a search space configuration for new radio multicast are provided. A user equipment (UE) receives, from a base station (BS) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space. The UE determines a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria. The UE receives, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information message in the prioritized search space.

Description

SEARCH SPACE CONFIGURATION FOR NEW RADIO MULTICAST

Min HUANG, Chao WEI and Qiaoyu LI

TECHNICAL FIELD

This application relates to wireless communication systems, and more particularly to a search space configuration for new radio multicast.

INTRODUCTION

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . A wireless multiple-access communications system may include a number of base stations (BSs) , each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE) .

To meet the growing demands for expanded mobile broadband connectivity, wireless communication technologies are advancing from the long-term evolution (LTE) technology to a next generation new radio (NR) technology, which may be referred to as 5 ^th Generation (5G) . For example, NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE. NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum.

In a wireless communication network, a search space refers to a time-frequency region in a transmission slot where downlink (DL) control information is carried. The search spaces are typically located at the beginning of a transmission slot. Some examples of DL control information may include slot format information, UL scheduling grants, and/or DL scheduling grants. Slot format information may indicate whether each slot in a set of slots is configured for UL communication, DL communication, or flexible (for DL or UL communication) . A UL scheduling grant may indicate scheduling information for UL communications. A DL scheduling grant may indicate scheduling information for DL communication. A BS may configure a UE with multiple search spaces for DL control channel monitoring. The BS may configure the search spaces to be repeated at some time intervals. The UE may perform blind decoding in the search spaces to search for DL control information from the BS. The UE may communicate with the BS based on detected DL control information.

BRIEF SUMMARY OF SOME EXAMPLES

The following summarizes some aspects of the present disclosure to provide a basic understanding of the discussed technology. This summary is not an extensive overview of all contemplated features of the disclosure and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in summary form as a prelude to the more detailed description that is presented later.

For example, in an aspect of the disclosure, a method of wireless communication performed by a UE includes receiving, from a BS in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space; determining a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria; and receiving, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the prioritized search space.

In an additional aspect of the disclosure, a UE includes a transceiver configured to receive, from a BS in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space; and a processor configured to determine a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria, wherein the transceiver is further configured to receive, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the prioritized search space.

In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code includes code for causing the UE to receive, from a BS in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space; code for causing the UE to determine a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria; and code for causing the UE to receive, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the prioritized search space.

In an additional aspect of the disclosure, a UE includes means for receiving, from a BS in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space; means for determining a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria; and means for receiving, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the prioritized search space.

In another example, in an aspect of the disclosure, a method of wireless communication performed by a BS includes communicating, with a wireless communication device in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and communicating, with the wireless communication device in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the first search space or the second search space based on the priority criteria.

In an additional aspect of the disclosure, a BS includes a transceiver configured to communicate, with a wireless communication device in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and communicate, with the wireless communication device in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the first search space or the second search space based on the priority criteria.

In an additional aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code includes code for causing a BS to communicate, with a wireless communication device in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and code for causing the BS to communicate, with the wireless communication device in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the first search space or the second search space based on the priority criteria.

In an additional aspect of the disclosure, a BS includes means for communicating, with a wireless communication device in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and means for communicating, with the wireless communication device in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the first search space or the second search space based on the priority criteria.

Other aspects, features, and embodiments of the present invention will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary aspects of the present invention in conjunction with the accompanying figures. While features of the present invention may be discussed relative to certain aspects and figures below, all aspects of the present invention can include one or more of the advantageous features discussed herein. In other words, while one or more aspects may be discussed as having certain advantageous features, one or more of such features may also be used in accordance with the various aspects of the invention discussed herein. In similar fashion, while exemplary aspects may be discussed below as device, system, or method aspects it should be understood that such exemplary aspects can be implemented in various devices, systems, and methods.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a wireless communication network according to some aspects of the present disclosure.

FIG. 2 illustrates a wireless communication network that provisions for user equipment reporting according to some aspects of the present disclosure.

FIG. 3 illustrates a transmission frame for a communication network according to some aspects of the present disclosure.

FIG. 4 illustrates a signaling diagram of a process for a search space configuration according to some aspects of the present disclosure.

FIG. 5 illustrates a block diagram of search space priority sequences according to some aspects of the present disclosure.

FIG. 6 illustrates a block diagram of a user equipment according to some aspects of the present disclosure.

FIG. 7 illustrates a block diagram of an exemplary base station according to some aspects of the present disclosure.

FIG. 8 illustrates a flow diagram of an example process of a search space configuration with a user equipment according to some aspects of the present disclosure.

FIG. 9 illustrates a flow diagram of an example process of a search space configuration by a base station according to some aspects of the present disclosure.

DETAILED DESCRIPTION

The detailed description set forth below, in connection with the appended drawings, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

This disclosure relates generally to wireless communications systems, also referred to as wireless communications networks. In various aspects, the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, Global System for Mobile Communications (GSM) networks, 5 ^th Generation (5G) or new radio (NR) networks, as well as other communications networks. As described herein, the terms “networks” and “systems” may be used interchangeably.

An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like. UTRA, E-UTRA, and GSM are part of universal mobile telecommunication system (UMTS) . In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP) , and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) . These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations that aims to define a globally applicable third generation (3G) mobile phone specification. 3GPP long term evolution (LTE) is a 3GPP project which was aimed at improving the UMTS mobile phone standard. The 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices. The present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.

5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface. In order to achieve these goals, further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks. The 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with a ultra-high density (e.g., ～1M nodes/km ²) , ultra-low complexity (e.g., ～10s of bits/sec) , ultra-low energy (e.g., ～10+ years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ～99.9999%reliability) , ultra-low latency (e.g., ～ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ～ 10 Tbps/km ²) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.

The 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) ; having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD/TDD implementations, subcarrier spacing may occur with 15 kHz, for example over 5, 10, 20 MHz, and the like bandwidth (BW) . For other various outdoor and small cell coverage deployments of TDD greater than 3 GHz, subcarrier spacing may occur with 30 kHz over 80/100 MHz BW. For other various indoor wideband implementations, using a TDD over the unlicensed portion of the 5 GHz band, the subcarrier spacing may occur with 60 kHz over a 160 MHz BW. Finally, for various deployments transmitting with mmWave components at a TDD of 28 GHz, subcarrier spacing may occur with 120 kHz over a 500 MHz BW.

The scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs to allow transmissions to start on symbol boundaries. 5G NR also contemplates a self-contained integrated subframe design with UL/downlink scheduling information, data, and acknowledgement in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL/downlink that may be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet the current traffic needs.

Various other aspects and features of the disclosure are further described below. It should be apparent that the teachings herein may be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative and not limiting. Based on the teachings herein one of an ordinary level of skill in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. For example, a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer. Furthermore, an aspect may comprise at least one element of a claim.

Communications can be in the form of radio frames. A radio frame may be divided into a plurality of subframe, which can be divided into one or more slots. Each slot may be further divided into mini-slots. At the smallest level (e.g., within a slot) , a resource element (RE) comprises a single subcarrier in the frequency domain, and a single OFDM symbol in the time domain. A resource element group (REG) may be comprised of a number of REs (e.g., 12) within a single OFDM symbol. A control channel element (CCE) comprises a group of REGs.

In NR, a physical downlink control channel (PDCCH) is transmitted over a Control Resource Set (CORESET) . A CORESET is a set of CCEs that is used to carry PDCCH transmissions, for example 1, 2, 4, 8, or 16 CCEs. A CORESET is generally limited to span less than the full frequency range of a radio frame. Each CORESET has an associated CCE to REG mapping. Frequencies within a CORESET can be contiguous or non-contiguous. A CORESET may span one or more OFDM symbol time periods.

A set of potential PDCCH candidates is called a search space and is associated with a CORESET and can have configurable monitoring occasions defined. A BS may configure a UE with one or more search spaces for PDCCH monitoring based on a search space configuration. The UE may perform blind decoding in the search spaces to search for DL control information from the BS. For example, a BS may configure a UE with bandwidth parts (BWPs) , the CORESETS, and/or the PDCCH search spaces via radio resource control (RRC) configurations.

The UE can have multiple search spaces, which are divided into two types: a common search space (CSS) and a UE-specific (or unicast) search space (USS) . In CSSs, the UE can search for a DCI message to receive a system information block (SIB) , random-access channel (RACH) message type 2 and message type 4, a paging message or cell-specific signaling. In USSs, the UE can search for the DCI message to receive UE-specific physical downlink shared channel (PDSCH) signaling. The UE may have a certain PDCCH processing capability, including a maximum number of PDCCH candidates and a maximum number of non-overlapping CCEs per slot. If the UE is configured to search multiple search spaces in one slot, the UE may determine which search spaces can be searched based on its PDCCH processing capability and the priorities of such search spaces. In some aspects, the priority rule may be as follows: (1) all CSSs can have higher priority than any USS, where the UE can expect to search all the CSSs without exceeding its PDCCH processing capability; and (2) the remaining PDCCH processing capability is allocated to USSs, where all USSs are ordered by respective indexes (e.g., search space identifiers (SSIDs) ) . In some aspects, the smallest-index USS can be allocated first, until all the USSs are allocated, or the maximum number of PDCCH candidates or the maximum number of non-overlapping CCEs is reached.

In some aspects, the PDSCH signaling carries multicast data that is directed to all the UEs in the cell, so its DCI can be sent in a CSS. However, the importance of multicast data is not regularly higher in priority than unicast data whose DCI is sent in a USS. In some examples, high-priority multicast data includes warning information, road map update for a vehicle, instant data (such as processing result sharing in multi-node coordinative calculation) , or interactive data (such as status sharing in cooperation) . In some examples, low-priority multicast data includes advertisements, news, or the like. In multicast transmissions, a BS can send single-cell multicast control channel (SC-MCCH) signaling whose DCI is scrambled with a single-cell radio network temporary identifier (SC-RNTI) to all UEs in the cell. Within that cell, a number of multicast sessions can be configured, each of which may e associated with a group radio network temporary identifier (G-RNTI) value and a discontinuous reception (DRX) profile (e.g., cycle period, offset, on-duration length, inactivity-timer length, etc. ) . If a UE receives multiple multicast sessions, the UE may need to monitor for PDCCH signaling at all their on-duration occasions of different DRX profiles. The UE can blindly decode a PDCCH to search for DCI signaling that may be scrambled with the configured G-RNTI values. In some aspects, a multicast session can be referred to as a “Multimedia Broadcast Multicast Service (MBMS) session. ”

Unlike the data whose DCIs are sent in legacy CSSs, the multicast traffic may have large data packet sizes. If all the multicast traffic data has higher priority than UE-specific traffic data, some important UE-specific traffic data may not be scheduled. In this respect, it may be unsuitable to follow the legacy search space priority rule of allocating PDCCH processing capability to the whole CSSs prior to the whole USSs. The CSS for multicast can be an exception of the whole legacy CSSs whose priorities are higher than USSs. Following the legacy rule to handle multicast search space may lead to dropping important unicast data.

In 5G NR, the UE can be configured with reduced capability and can be referred to as NR-light UE or reduced-capability UE. The NR-light UE can have lower cost and reduced capability, such as a reduced number of antennas, reduced Tx/Rx bandwidth, limited battery capacity, and reduced processing capability of PDCCH blind decoding. The NR-light UE can be used in Internet-of-Things (IoT) use cases, such as smart wearable devices, industrial sensors, video surveillance devices, etc. In some aspects, the NR-light UE has lower PDCCH processing capability than regular UEs. Due to its low-cost hardware, low-cost software or smaller battery capacity, the NR-light UE may have a smaller maximum number of PDCCH candidates and a smaller maximum number of non-overlapping CCEs per slot compared to a regular UE. Therefore, the number of searched search spaces handled by the NR-light UE may be smaller than a regular UE.

In this respect, the subject technology provides for a framework that decides the PDCCH processing capability allocation order among a multicast search space (MSS) and a unicast search space. The search space configuration can configure one or more search spaces, whose type is identified as MSS. The search space configuration of the subject technology can flexibly arrange the priorities for either whole MSSs/USSs or each individual MSS/USS as a prioritized search space sequence in the searching order. The search space configuration of the subject technology can avoid dropping important multicast data or unicast data, which may be particularly prevalent in UEs that may have reduced PDCCH processing capabilities such as NR-light UEs. In some implementations, a BS (e.g., gNB) can configure the priorities (e.g., PDCCH processing capability allocation order) between USS and MSS. In this respect, when the BS sends a search space configuration to the UE, the search space configuration indicates a prioritized allocation for MSS. In some aspects, the UE can receive PDCCH processing allocation for one or more MSSs. In some aspects, when one or more MSSs collides with (e.g., occurs in the same slot) one or more USSs, the UE can determine the priorities of search spaces for a slot (e.g., which search spaces need to be allocated with PDCCH processing capability in a slot) . In some aspects, the search space configuration may include priority criteria that indicates that the whole USSs have higher priorities or lower priorities than the whole MSSs. The term “whole USSs” can be referred to as a set of contiguous USSs and the term “whole MSSs” can be referred to as a set of contiguous MSSs. In some aspects, multiple MSSs can be prioritized based on respective SSIDs. In some aspects, the priority criteria may alternatively indicate that the priorities of each individual MSS and each individual USS are jointly determined based on the successive ordering of the SSIDs.

FIG. 1 illustrates a wireless communication network 100 according to some aspects of the present disclosure. The network 100 may be a 5G network. The network 100 includes a number of base stations (BSs) 105 (individually labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities. A BS 105 may be a station that communicates with UEs 115 and may also be referred to as an evolved node B (eNB) , a next generation eNB (gNB) , an access point, and the like. Each BS 105 may provide communication coverage for a particular geographic area. For example, each BS 105 may provide communication coverage for a respective geographic coverage area 110. In 3GPP, the term “cell” can refer to this particular geographic coverage area of a BS 105 and/or a BS subsystem serving the coverage area, depending on the context in which the term is used.

A BS 105 may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell. A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A small cell, such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) . A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in FIG. 1, the BSs 105d and 105e may be regular macro BSs, while the BSs 105a-105c may be macro BSs enabled with one of three dimension (3D) , full dimension (FD) , or massive MIMO. The BSs 105a-105c may take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. The BS 105f may be a small cell BS which may be a home node or portable access point. A BS 105 may support one or multiple (e.g., two, three, four, and the like) cells. In the example shown in FIG. 1, the

BSs

105a, 105b and 105c are examples of macro BSs for the

coverage areas

110a, 110b and 110c, respectively. The BSs 105d is an example of a pico BS or a femto BS for the coverage area 110d.

The network 100 may support synchronous or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.

The UEs 115 are dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile. A UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like. A UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like. In one aspect, a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC) . In another aspect, a UE may be a device that does not include a UICC. In some aspects, the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices. The UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100. In one aspects,

UEs

115c and 115d are in communication with one another through sidelink transmissions between the

UEs

115c and 115d in a coverage area 110f. A UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like. The UEs 115e-115h are examples of various machines configured for communication that access the network 100. The UEs 115i-115k are examples of vehicles in coverage area 110e that are equipped with wireless communication devices configured for communication that access the network 100. A UE 115 may be able to communicate with any type of the BSs, whether macro BS, small cell, or the like. In FIG. 1, a lightning bolt (e.g., communication links) indicates wireless transmissions between a UE 115 and a serving BS 105, which is a BS designated to serve the UE 115 on the downlink (DL) and/or uplink (UL) , desired transmission between BSs 105, backhaul transmissions between BSs, or sidelink transmissions between UEs 115.

In operation, the BSs 105a-105c may serve the

UEs

115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity. The macro BS 105d may perform backhaul communications with the BSs 105a-105c, as well as small cell, the BS 105f. The macro BS 105d may also transmits multicast services which are subscribed to and received by the

UEs

115c and 115d. Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.

The BSs 105 may also communicate with a core network. The core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC) ) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc. ) and may perform radio configuration and scheduling for communication with the UEs 115. In various examples, the BSs 105 may communicate, either directly or indirectly (e.g., through core network) , with each other over backhaul links (e.g., X1, X2, etc. ) , which may be wired or wireless communication links.

At least some of the network devices, such as a base station 105, may include subcomponents such as an access network entity, which may be an example of the ANC or centralized unit (CU) . Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, a transmission/reception point (TRP) , or a distributed unit (DU) . In some configurations, 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 consolidated into a single network device (e.g., a base station 105) . For example, a CU may control two or more DUs, which may each be associated with a different cell.

The network 100 may also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such as the UE 115e, which may be a drone. Redundant communication links with the UE 115e may include links from the macro BSs 105d and 105e, as well as links from the small cell BS 105f. Other machine type devices, such as the UE 115f (e.g., a thermometer) , the UE 115g (e.g., smart meter) , and UE 115h (e.g., wearable device) may communicate through the network 100 either directly with BSs, such as the small cell BS 105f, and the macro BS 105e, or in multi-step-size configurations by communicating with another user device which relays its information to the network, such as the UE 115f communicating temperature measurement information to the smart meter, the UE 115g, which is then reported to the network through the small cell BS 105f. The network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such asV2V, V2X, C-V2X communications between a

UE

115i, 115j, or 115k and other UEs 115, and/or vehicle-to-infrastructure (V2I) communications between a

UE

115i, 115j, or 115k and a BS 105.

In some implementations, the network 100 utilizes OFDM-based waveforms for communications. An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data. In some instances, the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW. The system BW may also be partitioned into subbands. In other instances, the subcarrier spacing and/or the duration of TTIs may be scalable.

In some aspects, the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB) ) for downlink (DL) and uplink (UL) transmissions in the network 100. DL refers to the transmission direction from a BS 105 to a UE 115, whereas UL refers to the transmission direction from a UE 115 to a BS 105. The communication can be in the form of radio frames. A radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band. In a TDD mode, UL and DL transmissions occur at different time periods using the same frequency band. For example, a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.

The DL subframes and the UL subframes can be further divided into several regions. For example, each DL or UL subframe may have pre-defined regions for transmissions of reference signals, control information, and data. Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115. For example, a reference signal can have a particular pilot pattern or structure, where pilot tones may span across an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency. For example, a BS 105 may transmit cell specific reference signals (CRSs) and/or channel state information –reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel. Similarly, a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate a UL channel. Control information may include resource assignments and protocol controls. Data may include protocol data and/or operational data. In some aspects, the BSs 105 and the UEs 115 may communicate using self-contained subframes. A self-contained subframe may include a portion for DL communication and a portion for UL communication. A self-contained subframe can be DL-centric or UL-centric. A DL-centric subframe may include a longer duration for DL communication than for UL communication. A UL-centric subframe may include a longer duration for UL communication than for UL communication.

In some aspects, the network 100 may be an NR network deployed over a licensed spectrum. The BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) ) in the network 100 to facilitate synchronization. The BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB) , remaining system information (RMSI) , and other system information (OSI) ) to facilitate initial network access. In some instances, the BSs 105 may broadcast the PSS, the SSS, and/or the MIB in the form of synchronization signal block (SSBs) over a physical broadcast channel (PBCH) and may broadcast the RMSI and/or the OSI over a physical downlink shared channel (PDSCH) .

In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105. The PSS may enable synchronization of period timing and may indicate a physical layer identity value. The UE 115 may then receive a SSS. The SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell. The PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.

After receiving the PSS and SSS, the UE 115 may receive a MIB. The MIB may include system information for initial network access and scheduling information for RMSI and/or OSI. After decoding the MIB, the UE 115 may receive RMSI and/or OSI. The RMSI and/or OSI may include RRC information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (e.g., PDCCH) monitoring, physical UL control channel (PUCCH) , physical UL shared channel (PUSCH) , power control, and SRS.

After obtaining the MIB, the RMSI and/or the OSI, the UE 115 can perform a random access procedure to establish a connection with the BS 105. In some examples, the random access procedure may be a four-step random access procedure. For example, the UE 115 may transmit a random access preamble and the BS 105 may respond with a random access response. The random access response (RAR) may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, a UL grant, a temporary cell-radio network temporary identifier (C-RNTI) , and/or a backoff indicator. Upon receiving the random access response, the UE 115 may transmit a connection request to the BS 105 and the BS 105 may respond with a connection response. The connection response may indicate a contention resolution. In some examples, the random access preamble, the RAR, the connection request, and the connection response can be referred to as message 1 (MSG1) , message 2 (MSG2) , message 3 (MSG3) , and message 4 (MSG4) , respectively. In some examples, the random access procedure may be a two-step random access procedure, where the UE 115 may transmit a random access preamble and a connection request in a single transmission and the BS 105 may respond by transmitting a random access response and a connection response in a single transmission.

After establishing a connection, the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and/or DL communications. The BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH. The scheduling grants may be transmitted in the form of DL control information (DCI) . The BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via a PDSCH according to a DL scheduling grant. The UE 115 may transmit a UL communication signal to the BS 105 via a PUSCH and/or PUCCH according to a UL scheduling grant.

In some aspects, the BS 105 may communicate with a UE 115 using HARQ techniques to improve communication reliability, for example, to provide a URLLC service. The BS 105 may schedule a UE 115 for a PDSCH communication by transmitting a DL grant in a PDCCH. The BS 105 may transmit a DL data packet to the UE 115 according to the schedule in the PDSCH. The DL data packet may be transmitted in the form of a transport block (TB) . If the UE 115 receives the DL data packet successfully, the UE 115 may transmit a HARQ ACK to the BS 105. Conversely, if the UE 115 fails to receive the DL transmission successfully, the UE 115 may transmit a HARQ NACK to the BS 105. Upon receiving a HARQ NACK from the UE 115, the BS 105 may retransmit the DL data packet to the UE 115. The retransmission may include the same coded version of DL data as the initial transmission. Alternatively, the retransmission may include a different coded version of the DL data than the initial transmission. The UE 115 may apply soft-combining to combine the encoded data received from the initial transmission and the retransmission for decoding. The BS 105 and the UE 115 may also apply HARQ for UL communications using substantially similar mechanisms as the DL HARQ.

In some aspects, the network 100 may operate over a system BW or a component carrier (CC) BW. The network 100 may partition the system BW into multiple BWPs (e.g., portions) . A BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW) . The assigned BWP may be referred to as the active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 for UL or DL communications in the active BWP. In some aspects, a BS 105 may assign a pair of BWPs within the CC to a UE 115 for UL and DL communications. For example, the BWP pair may include one BWP for UL communications and one BWP for DL communications.

In some aspects, the network 100 may operate over a shared channel, which may include shared frequency bands and/or unlicensed frequency bands. For example, the network 100 may be an NR-U network operating over an unlicensed frequency band. In such an aspect, the BSs 105 and the UEs 115 may be operated by multiple network operating entities. To avoid collisions, the BSs 105 and the UEs 115 may employ a listen-before-talk (LBT) procedure to monitor for transmission opportunities (TXOPs) in the shared channel. A TXOP may also be referred to as COT. For example, a transmitting node (e.g., a BS 105 or a UE 115) may perform an LBT prior to transmitting in the channel. When the LBT passes, the transmitting node may proceed with the transmission. When the LBT fails, the transmitting node may refrain from transmitting in the channel.

An LBT can be based on energy detection (ED) or signal detection. For an energy detection-based LBT, the LBT results in a pass when signal energy measured from the channel is below a threshold. Conversely, the LBT results in a failure when signal energy measured from the channel exceeds the threshold. For a signal detection-based LBT, the LBT results in a pass when a channel reservation signal (e.g., a predetermined preamble signal) is not detected in the channel. Additionally, an LBT may be in a variety of modes. An LBT mode may be, for example, a category 4 (CAT4) LBT, a category 2 (CAT2) LBT, or a category 1 (CAT1) LBT. A CAT1 LBT is referred to a no LBT mode, where no LBT is to be performed prior to a transmission. A CAT2 LBT refers to an LBT without a random backoff period. For instance, a transmitting node may determine a channel measurement in a time interval and determine whether the channel is available or not based on a comparison of the channel measurement against a ED threshold. A CAT4 LBT refers to an LBT with a random backoff and a variable contention window (CW) . For instance, a transmitting node may draw a random number and backoff for a duration based on the drawn random number in a certain time unit.

In some aspects, the network 100 may support sidelink communication among the UEs 115 over a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) . In some aspects, the UEs 115 may communicate with each other over a 2.4 GHz unlicensed band, which may be shared by multiple network operating entities using various radio access technologies (RATs) such as NR-U, WiFi, and/or licensed-assisted access (LAA) as shown in FIG. 2.

In some implementations, a BS 105 may configure a UE 115 with multiple PDCCH search spaces for PDCCH monitoring. The BS 105 can transmit a search space configuration to the UE 115 to configure multiple search spaces, including multicast search space (identified as MSS) and unicast search space (identified as USS) , for PDCCH monitoring. The search space configuration provides a framework that decides the PDCCH processing capability allocation order among multicast SS and unicast SS. Mechanisms for configuring (and using) prioritized search spaces are described in greater detail herein.

FIG. 2 illustrates a wireless communication network 200 that provisions for user equipment reporting according to some aspects of the present disclosure. The network 200 may correspond to a portion of the network 100. FIG. 2 illustrates two BSs 205 (shown as 205a and 205b) and six UEs 215 (shown as 215a1, 215a2, 215a3, 215a4, 215b1, and 215b2) for purposes of simplicity of discussion, though it will be recognized that aspects of the present disclosure may scale to any suitable number of UEs 215 (e.g., the about 2, 3, 4, 5, 7 or more) and/or BSs 205 (e.g., the about 1, 3 or more) . The BS 205 and the UEs 215 may be similar to the BSs 105 and the UEs 115, respectively. The BSs 205 and the UEs 215 may share the same radio frequency band for communications. In some instances, the radio frequency band may be a 2.4 GHz unlicensed band, a 5 GHz unlicensed band, or a 6 GHz unlicensed band. In general, the shared radio frequency band may be at any suitable frequency.

The BS 205a and the UEs 215a1-215a4 may be operated by a first network operating entity. The BS 205b and the UEs 215b1-215b2 may be operated by a second network operating entity. In some aspects, the first network operating entity may utilize a same RAT as the second network operating entity. For instance, the BS 205a and the UEs 215a1-215a4 of the first network operating entity and the BS 205b and the UEs 215b1-215b2 of the second network operating entity are NR-U devices. In some other aspects, the first network operating entity may utilize a different RAT than the second network operating entity. For instance, the BS 205a and the UEs 215a1-215a4 of the first network operating entity may utilize NR-U technology while the BS 205b and the UEs 215b1-215b2 of the second network operating entity may utilize WiFi or LAA technology.

In the network 200, some of the UEs 215a1-215a4 may communicate with each other in peer-to-peer communications. For example, the UE 215a1 may communicate with the UE 215a2 over a sidelink 252, the UE 215a3 may communicate with the UE 215a4 over another sidelink 251, and the UE 215b1 may communicate with the UE 215b2 over yet another sidelink 254. The

sidelinks

251, 252, and 254 are unicast bidirectional links. Some of the UEs 215 may also communicate with the BS 205a or the BS 205b in a UL direction and/or a DL direction via communication links 253. For instance, the UE 215a1, 215a3, and 215a4 are within a coverage area 210 of the BS 205a, and thus may be in communication with the BS 205a. The UE 215a2 is outside the coverage area 210, and thus may not be in direct communication with the BS 205a. In some instances, the UE 215a1 may operate as a relay for the UE 215a2 to reach the BS 205a. Similarly, the UE 215b1 is within a coverage area 212 of the BS 205b, and thus may be in communication with the BS 205b and may operate as a relay for the UE 215b2 to reach the BS 205b. In some aspects, some of the UEs 215 are associated with vehicles (e.g., similar to the UEs 115i-k) and the communications over the

sidelinks

251, 252, and 254 may be C-V2X communications. C-V2X communications may refer to communications between vehicles and any other wireless communication devices in a cellular network.

In some cases, a BS 205 may configure a UE 215 with multiple PDCCH search spaces for PDCCH monitoring. The BS 105 can transmit a search space configuration to the UE 115 to configure multiple search spaces, including multicast search space (identified as MSS) and unicast search space (identified as USS) , for PDCCH monitoring. The search space configuration provides a framework that decides the PDCCH processing capability allocation order among multicast SS and unicast SS. Mechanisms for configuring (and using) prioritized search spaces are described in greater detail herein.

FIG. 3 illustrates a timing diagram illustrating a transmission frame structure 300 according to some aspects of the present disclosure. The transmission frame structure 300 may be employed by BSs such as the BSs 105 and UEs such as the UEs 115 in a network such as the network 100 for communications. In particular, the BS may communicate with the UE using time-frequency resources configured as shown in the transmission frame structure 300. In FIG. 3, the x-axes represent time in some arbitrary units and the y-axes represent frequency in some arbitrary units. The transmission frame structure 300 includes a radio frame 302. The duration of the radio frame 302 may vary depending on the aspects. In an example, the radio frame 302 may have a duration of about ten milliseconds. The radio frame 302 includes M number of subframes 304, where M may be any suitable positive integer. In an example, M may be about 10.

Each subframe 304 may contain N slots 306, where N is any suitable positive number including 1. Each slot 306 includes a number of subcarriers 318 in frequency and a number of symbols 316 in time. The number of subcarriers 318 and/or the number of symbols 316 in a slot 306 may vary depending on the aspects, for example, based on the channel bandwidth, the subcarrier spacing (SCS) , and/or the cyclic prefix (CP) mode. One subcarrier 318 in frequency and one symbol 316 in time forms one resource element (RE) 320 for transmission.

A BS (e.g., BS 105 in FIG. 1) may schedule a UE (e.g., UE 115 in FIG. 1) for UL and/or DL communications at a time-granularity of slots 306. A BS 105 may schedule a UE 115 to monitor for PDCCH transmissions by instantiating a search space associated with a CORESET 312. The search space may also be instantiated with associated CORESET 314. Thus, as illustrated in the example of FIG. 3, there are two CORESETs, and therefore two monitoring occasions, within the slot 306 that are part of the search space the UE 115 monitors for control information from the BS 105.

While FIG. 3 illustrates two CORESETs, 312 and 314, for purposes of simplicity of illustration and discussion, it will be recognized that aspects of the present disclosure may scale to many more CORESETs, for example, about 3, 4 or more. Each CORESET may include a set of resources spanning a certain number of subcarriers 318 and a number of symbols 316 (e.g., about 1, 2, or 3) within a slot 306. As an alternative to multiple different CORESETs within a slot 306, one or more of the many CORESETs may be in a different slot than the others. Each CORESET has an associated control channel element (CCE) to resource element group (REG) mapping. A REG may include a group of REs 320. The CCE defines how DL control channel data may be transmitted.

A BS 105 may configure a UE 115 with one or more search spaces by associating a CORESET 312 with a starting position (e.g., a starting slot 306) , a symbol 316 location within a slot 306, a periodicity or a time pattern, and candidate mapping rules. For example, a search space may include a set of candidates mapped to CCEs with aggregation levels of 1, 2, 4, 8, and/or 12 CCEs. As an example, a search space may include the CORESET 312 starting at the first symbol 316 indexed within a starting slot 306. The search space may also include the CORESET 314 starting at a later symbol index within the starting slot 306. The exemplary search space may have a periodicity of about five slots and may have candidates at aggregation levels of 1, 2, 4, and/or 8.

The UE 115 may perform blind decoding in the search spaces to search for DL control information (e.g., slot format information and/or scheduling information) from the BS. In some examples, the UE may search a subset of the search spaces based on certain rules, for example, associated with the UE’s channel estimation and/or blind decoding capabilities. One such example of DL control information the UE 115 may be blind decoding for a PDCCH from the BS 105.

The BS 105 can transmit a search space configuration to the UE 115 to configure multiple search spaces, including multicast search space (identified as MSS) and unicast search space (identified as USS) , for PDCCH monitoring. The search space configuration can configure a unique search space identifier (or SSID) for each MSS. For example, the SSIDs represent the priorities, where a smaller SSID corresponds to a higher priority, i.e. being allocated with PDCCH processing capability earlier. For example, the MSS may include the CORESET 312 and the USS may include the CORESET 314, where the MSS has a higher priority than the USS. In another example, the USS may include the CORESET 312 and the MSS may include the CORESET 314, where the USS has a higher priority than the MSS. The search space configuration can configure an associated DCI format that is used to grant multicast PDSCH. For example, the DCI format can be associated with one or more multicast RNTIs, such as G-RNTI. This signaling message can be sent in RRC signaling, MAC CE, DCI, or a combination thereof. Each MSS corresponds to a plurality of multicast sessions. For example, each MSS corresponds to a set of G-RNTI values, or a multicast priority level, where each multicast session has a certain priority level. For a particular slot (e.g., slot 306) , the UE 115 can determine which MSSs are considered for prioritization depending on whether the corresponding multicast sessions are possibly scheduled. If a DRX parameter is configured for multicast transfer, the UE 115 can determine which MSSs are considered for prioritization based on the presence of on-duration of each multicast session. Those MSSs corresponding to the multicast sessions whose on-durations are present in the current slot (e.g., slot 306) are considered for prioritization.

FIG. 4 illustrates a signaling diagram of a process 400 for a search space configuration according to some aspects of the present disclosure. The process 400 may be implemented between a BS (e.g., BS 105 or BS 600) and a UE (e.g., the UE 115, 215 or 600) . The process 400 may employ similar mechanisms as in the structure 300 described above with respect to FIG. 3, and/or

processes

800 and 900 described herein with respect to FIGS. 8 and 9, respectively. Steps of the process 400 can be executed by computing devices (e.g., a processor, processing circuit, and/or other suitable component) of the BS 700 and the UE 600. In an example, the BS 700 may utilize one or more components, such as the processor 702, the memory 704, the search space configuration module 708, the transceiver 710, the modem 712, and the one or more antennas 716, to execute the steps of process 400. The UE 600 may utilize one or more components, such as the processor 602, the memory 604, the downlink control monitoring module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to execute the steps of process 400. As illustrated, the process 400 includes a number of enumerated steps, but aspects of the process 400 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

At action 402, the BS 105 (e.g., gNB) transmits a search space configuration signal message carrying a search space configuration to the UE 115, thereby configuring a plurality MSSs. In some aspects, the legacy CSSs and USSs can be configured by the same signaling message or other signaling messages. The search space configuration may include configuration information for defining search spaces as described herein. The search space configuration signal message may be sent semi-static via RRC configuration, and/or dynamic via MAC CE or UE-specific DCI or group-common DCI.

At action 404, the UE 115 can determine a prioritized search space such as which CSSs, USSs and MSSs can be searched for each slot. At action 406, the BS 105 transmits a PDCCH transmission carrying one or more DCIs in the corresponding CSSs, USSs and MSSs to the UE 115. At action 408, the UE 115 searches the prioritized search space such as the determined CSSs, USSs and MSSs by blind decoding for the current slot, and decodes the corresponding DCIs sent in the PDCCH transmission within the prioritized search space. At action 410, the BS 105 transmits unicast and multicast PDSCHs to the UE 115 based on the sent DCIs. At action 412, the UE 115 receives the unicast and multicast PDSCHs based on the decoded DCIs.

FIG. 5 illustrates a block diagram of search space priority sequences 500 according to some aspects of the present disclosure. The search space priority sequences 500 includes a first search space priority sequence 510, a second search space priority sequence 520 and a third search space priority sequence 530. The search space priority sequences 500 individually include three MSSs (depicted as “MSS 3, ” “MSS 5” and “MSS 6” ) that have corresponding multicast sessions possibly being scheduled in a current transmission slot, whose search space identifiers (SSIDs) are 3, 5, and 6 respectively. Additionally, the search space priority sequences 500 individually include three USSs (depicted as “USS 1, ” “USS 2” and “USS 4” ) that have corresponding unicast PDSCHs possibly being scheduled in the current transmission slot, whose SSIDs are 1, 2, and 4 respectively. The first search space priority sequence 510 includes a first set of USSs 512 that has a higher priority than a first set of MSSs 514. In this respect, the first set of USSs 512 is allocated with a downlink control channel processing capability before the first set of MSSs 514 in the searching order. In some implementations, the priority criteria in the search space configuration sent to the UE 115 may indicate that the first set of USSs 512 has a higher priority than the first set of MSSs 514. The USSs within the first set of USSs 512 and MSSs within the first set of MSSs 514 can be ordered separately according to their SSIDs.

The second search space priority sequence 520 includes a second set of MSSs 522 that has a higher priority than a second set of USSs 524. In this respect, the second set of MSSs 522 is allocated with a downlink control channel processing capability before the second set of USSs 524 in the searching order. In some implementations, the priority criteria in the search space configuration sent to the UE 115 may indicate that the second set of MSSs 522 has a higher priority than the second set of USSs 524. The USSs within the second set of USSs 524 and MSSs within the second set of MSSs 522 can be ordered separately according to their SSIDs.

The third search space priority sequence 530 includes a subset of USSs 532 (e.g., USS1, USS 2) and USS 536 (e.g., USS 4) ordered jointly with a subset of MSSs 538 (e.g., MSS 5, MSS 6) and MSS 534 (e.g., MSS 3) according to their SSIDs. In this regard, the search spaces are incrementally ordered in priority based on their respective SSID, where the lowest SSID has the highest priority in the searching order. In some implementations, the priority criteria in the search space configuration sent to the UE 115 may indicate that the

MSSs

534, 538 and the

USSs

532, 536 are jointly prioritized based on the search space identifier of each search space. When the PDCCH monitoring capability is full, the low-priority search spaces may not be allocated.

FIG. 6 is a block diagram of an exemplary UE 600 according to some aspects of the present disclosure. The UE 600 may be a UE 115 discussed in FIG. 1 or a UE 215 discussed in FIG. 2. As shown, the UE 600 may include a processor 602, a memory 604, a downlink control monitoring module 608, a transceiver 610 including a modem subsystem 612 and a radio frequency (RF) unit 614, and one or more antennas 616. These elements may be in direct or indirect communication with each other, for example via one or more buses.

The processor 602 may include a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 602 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The memory 604 may include a cache memory (e.g., a cache memory of the processor 602) , random access memory (RAM) , magnetoresistive RAM (MRAM) , read-only memory (ROM) , programmable read-only memory (PROM) , erasable programmable read only memory (EPROM) , electrically erasable programmable read only memory (EEPROM) , flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory. In an aspect, the memory 604 includes a non-transitory computer-readable medium. The memory 604 may store, or have recorded thereon, instructions 606. The instructions 606 may include instructions that, when executed by the processor 602, cause the processor 602 to perform the operations described herein with reference to the UEs 115 in connection with aspects of the present disclosure, for example, aspects of FIGS. 1-5 and 8. Instructions 606 may also be referred to as program code. The program code may be for causing a wireless communication device to perform these operations, for example by causing one or more processors (such as processor 602) to control or command the wireless communication device to do so. The terms “instructions” and “code” should be interpreted broadly to include any type of computer-readable statement (s) . For example, the terms “instructions” and “code” may refer to one or more programs, routines, sub-routines, functions, procedures, etc. “Instructions” and “code” may include a single computer-readable statement or many computer-readable statements.

The downlink control monitoring module 608 may be implemented via hardware, software, or combinations thereof. For example, the downlink control monitoring module 608 may be implemented as a processor, circuit, and/or instructions 606 stored in the memory 604 and executed by the processor 602. In some instances, the downlink control monitoring module 608 can be integrated within the modem subsystem 612. For example, the downlink control monitoring module 608 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 612.

The downlink control monitoring module 608 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-5 and 8. The downlink control monitoring module 608, in coordination with the transceiver 610, is configured to receive, from a BS 105 in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space.

In receiving the search space configuration, the downlink control monitoring module 608, in coordination with the transceiver 610, is also configured to receive a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, in which each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier. In some aspects, the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type. In some implementations, the same search space configuration (or in a different search space configuration) indicates a third search space having a higher priority than the first search space and the second search space. In some examples, the third search space corresponds to a common search space. In an aspect, the plurality of first search spaces and the plurality of second search spaces are ordered separately by respective search space identifiers. In some aspects, each of the plurality of first search spaces (of the multicast search space type) corresponds to a set of G-RNTIs. In an aspect, each of the plurality of first search spaces corresponds to a plurality of multicast sessions. In another aspect, each of the plurality of multicast sessions has a priority level. For example, two multicast sessions can have an identical priority level, such that their DCIs can be transmitted in one multicast search space. In other examples, each multicast session has a different (or unique) priority level. In one or more implementations, the downlink control monitoring module 608, in coordination with the transceiver 610, may receive a first configuration indicating the first search space in a first RRC message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.

In some implementations, the downlink control monitoring module 608 may coordinate with the processor 602 to determine a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria. In some implementations, the downlink control monitoring module 608 may coordinate with the processor 602 to determine that the priority criteria in the search space configuration indicates that the plurality of second search spaces has a higher priority than the plurality of first search spaces, and allocate downlink control channel processing capability to the plurality of second search spaces in a contiguous sequence that precedes the plurality of first search spaces in a transmission slot. In some aspects, the downlink control monitoring module 608, in coordination with the processor 602, may determine that the priority criteria indicates that the plurality of first search spaces has a higher priority than the plurality of second search spaces, and allocates downlink control channel processing capability to the plurality of first search spaces in a contiguous sequence that precedes the plurality of second search spaces in a transmission slot. In other aspects, the downlink control monitoring module 608, in coordination with the processor 602, may determine that the priority criteria indicates that the plurality of first search spaces and the plurality of second search spaces are jointly prioritized based on the search space identifier of each search space, and allocates downlink control channel processing capability to one or more of the plurality of first search spaces and one or more of the plurality of second search spaces in an ordered sequence of search space identifiers in a transmission slot. In some examples, the search space identifiers in the ordered sequence correspond to different priorities of allocation for downlink control channel processing. In some implementations, the downlink control monitoring module 608 can allocate a downlink control channel processing capability that includes at least one of a number of instances of decoding physical downlink control channel (PDCCH) candidates and a number of instances of decoding non-overlapping control channel elements. In some examples, the number of instances corresponds to a maximum number allowed.

In some implementations, the downlink control monitoring module 608 may coordinate with the processor 602 to determine whether a discontinuous reception (DRX) parameter indicates a configuration for multicast transfer. In some aspects, the downlink control monitoring module 608, in coordination with the processor 602, may determine which search spaces of the plurality of first search spaces correspond to one or more of the plurality of multicast sessions whose on-duration state is present in a transmission slot when the DRX parameter is determined to indicate the configuration for multicast transfer. The downlink control monitoring module 608 may prioritize the search spaces by search space identifier that are determined to correspond to the one or more of the plurality of multicast sessions whose on-duration state is present in the transmission slot.

In one or more implementations, the downlink control monitoring module 608 may coordinate with the processor 602 to determine whether an allocation of the first search space collides with the second search space in a transmission slot. As such, the downlink control monitoring module 608, in coordination with the processor 602, may determine a first priority of the first search space and a second priority of the second search space for the transmission slot based on the priority criteria when the allocation of the first search space is determined to collide with the second search space in the transmission slot. In some aspects, the downlink control monitoring module 608 may determine the prioritized search space based on a comparison between the first priority and the second priority. The downlink control monitoring module 608, in coordination with the processor 602, can allocate downlink control channel processing capability to the prioritized search space for the transmission slot.

The downlink control monitoring module 608, in coordination with the transceiver 610, can receive, from the BS 105 in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the prioritized search space. In some aspects, the DCI message has a DCI format that is associated with one or more G-RNTIs when the prioritized search space corresponds to the multicast search space type. In some aspects, the second frequency subband includes a plurality of PDCCHs multiplexed in at least one of time or frequency. As such, the downlink control monitoring module 608, in coordination with the transceiver 610, can receive the DCI message in one or more PDCCHs of the plurality of PDCCHs. The downlink control monitoring module 608, in coordination with the transceiver 610, can decode one or more PDCCH candidates in the prioritized search space. In doing so, the downlink control monitoring module 608, in coordination with the transceiver 610, can decode the DCI message in the decoded one or more PDCCH candidates.

In some implementations, the downlink control monitoring module 608, in coordination with the transceiver 610, can receive, from the BS 105 in the second frequency subband, one or more of unicast data or multicast data based on the received DCI message. In some aspects, the second frequency subband includes a plurality of PDSCHs multiplexed in at least one of time or frequency. In this respect, the downlink control monitoring module 608, in coordination with the transceiver 610, can receive the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.

As shown, the transceiver 610 may include the modem subsystem 612 and the RF unit 614. The transceiver 610 can be configured to communicate bi-directionally with other devices, such as the BSs 105. The modem subsystem 612 may be configured to modulate and/or encode the data from the memory 604 and/or the downlink control monitoring module 608 according to a modulation and coding scheme (MCS) , e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc. The RF unit 614 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc. ) modulated/encoded data (e.g., uplink data, synchronization signal, SSBs) from the modem subsystem 612 (on outbound transmissions) or of transmissions originating from another source such as a UE 115 or a BS 105. The RF unit 614 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 610, the modem subsystem 612 and the RF unit 614 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.

The RF unit 614 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 616 for transmission to one or more other devices. The antennas 616 may further receive data messages transmitted from other devices. The antennas 616 may provide the received data messages for processing and/or demodulation at the transceiver 610. The transceiver 610 may provide the demodulated and decoded data to the downlink control monitoring module 608 for processing. The antennas 616 may include multiple antennas of similar or different designs in order to sustain multiple transmission links. The RF unit 614 may configure the antennas 616. In some aspects, the RF unit 614 may include various RF components, such as local oscillator (LO) , analog filters, and/or mixers. The LO and the mixers can be configured based on a certain channel center frequency. The analog filters may be configured to have a certain passband depending on a channel BW.The RF components may be configured to operate at various power modes (e.g., a normal power mode, a low-power mode, power-off mode) and may be switched among the different power modes depending on transmission and/or reception requirements at the UE 600.

In an aspect, the UE 600 can include multiple transceivers 610 implementing different RATs (e.g., NR and LTE) . In an aspect, the UE 600 can include a single transceiver 610 implementing multiple RATs (e.g., NR and LTE) . In an aspect, the transceiver 610 can include various components, where different combinations of components can implement different RATs.

FIG. 7 is a block diagram of an exemplary BS 700 according to some aspects of the present disclosure. The BS 700 may be a BS 105 in the network 100 as discussed above in FIG. 1 or a BS 205 in the network 200 as discussed above in FIG. 2. As shown, the BS 700 may include a processor 702, a memory 704, a search space configuration module 708, a transceiver 710 including a modem subsystem 712 and a RF unit 714, and one or more antennas 716. These elements may be in direct or indirect communication with each other, for example via one or more buses.

The processor 702 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 702 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

The memory 704 may include a cache memory (e.g., a cache memory of the processor 702) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, the memory 704 may include a non-transitory computer-readable medium. The memory 704 may store instructions 706. The instructions 706 may include instructions that, when executed by the processor 702, cause the processor 702 to perform operations described herein, for example, aspects of FIGS. 1-5 and 9. Instructions 706 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 6.

The search space configuration module 708 may be implemented via hardware, software, or combinations thereof. For example, the search space configuration module 708 may be implemented as a processor, circuit, and/or instructions 706 stored in the memory 704 and executed by the processor 702. In some instances, the search space configuration module 708 can be integrated within the modem subsystem 712. For example, the search space configuration module 708 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 712.

The search space configuration module 708 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-5 and 9. The search space configuration module 708 may coordinate with the transceiver 710 to communicate, with the UE 600 in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space. In some implementations, in communicating the search space configuration, the search space configuration module 708, in coordination with the transceiver 710, can transmit a first configuration indicating the first search space in a first RRC message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.

In some implementations, in communicating the search space configuration, the search space configuration module 708, in coordination with the transceiver 710, can transmit the search space configuration indicating a third search space having a priority greater than that of the first search space and the second search space. In some aspects, the third search space corresponds to a common search space. In some examples, the common search space has a higher priority than the multicast search space, and the multicast search space has a higher priority than the unicast search space. In other examples, the common search space has a higher priority than the unicast search space, and the unicast search space has a higher priority than the multicast search space.

In communicating the search space configuration, the search space configuration module 708, in coordination with the transceiver 710, can transmit a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces. In some aspects, each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.

The search space configuration module 708, in coordination with the transceiver 710, can communicate, with the UE in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the first search space or the second search space based on the priority criteria.

In some implementations, the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type. In this respect, the search space configuration module 708, in coordination with the transceiver 710, may communicate, with the UE in the second frequency subband, one or more of unicast data or multicast data based on the communicated DCI message. In some examples, the second frequency subband includes a plurality of PDSCHs multiplexed in at least one of time or frequency. As such, in communicating the one or more of the unicast data or the multicast data, the search space configuration module 708, in coordination with the transceiver 710, can transmit the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.

As shown, the transceiver 710 may include the modem subsystem 712 and the RF unit 714. The transceiver 710 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or 500 and/or another core network element. The modem subsystem 712 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a polar coding scheme, a digital beamforming scheme, etc. The RF unit 714 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc. ) modulated/encoded data (e.g., PDCCH, PDSCH, SSBs) from the modem subsystem 712 (on outbound transmissions) or of transmissions originating from another source such as a UE 115 and/or UE 500. The RF unit 714 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 710, the modem subsystem 712 and/or the RF unit 714 may be separate devices that are coupled together at the BS 105 to enable the BS 105 to communicate with other devices.

The RF unit 714 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 716 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115, 215 or 600 according to some aspects of the present disclosure. The antennas 716 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 710. The transceiver 710 may provide the demodulated and decoded data to the search space configuration module 708 for processing. The antennas 716 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.

In an aspect, the BS 700 can include multiple transceivers 710 implementing different RATs (e.g., NR and LTE) . In an aspect, the BS 700 can include a single transceiver 710 implementing multiple RATs (e.g., NR and LTE) . In an aspect, the transceiver 710 can include various components, where different combinations of components can implement different RATs.

FIG. 8 illustrates a flow diagram of an example process 800 of a search space configuration with a user equipment according to some aspects of the present disclosure. Aspects of the process 800 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device, such as the UEs 115, 215, and/or 600, may utilize one or more components, such as the processor 602, the memory 604, the downlink control monitoring module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to execute the steps of process 800. As illustrated, the process 800 includes a number of enumerated steps, but aspects of the process 800 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

The process 800 starts at block 810, where the UE receives, from BS 700 in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space. In some aspects, the search space configuration further indicates priority criteria between the first search space and the second search space. For instance, the UE may utilize one or more components, such as the processor 602, downlink control monitoring module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to receive the search space configuration.

At block 820, the UE determines a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria. For instance, the UE may utilize one or more components, such as the processor 602 and the downlink control monitoring module 608, to determine the prioritized search space.

At block 830, the UE receives, from the BS 700 in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the prioritized search space. For instance, the UE may utilize one or more components, such as the processor 602, downlink control monitoring module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to receive the DCI message.

FIG. 9 illustrates a flow diagram of an example process 900 of a search space configuration by a base station according to some aspects of the present disclosure. Aspects of the process 900 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device, such as the BSs 105, 205, and/or 700, may utilize one or more components, such as the processor 702, the memory 704, the downlink control monitoring module 708, the transceiver 710, the modem 712, and the one or more antennas 716, to execute the steps of process 900. As illustrated, the process 900 includes a number of enumerated steps, but aspects of the process 900 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

The process 900 starts at block 910, where the BS communicates, with the UE 600 in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space. In some aspects, the search space configuration further indicates a priority criteria between the first search space and the second search space. For instance, the BS may utilize one or more components, such as the processor 702, search space configuration module 708, the transceiver 710, the modem 712, and the one or more antennas 716, to communicate the search space configuration.

At block 920, the BS communicates, with the UE 600 in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a DCI message in the first search space or the second search space based on the priority criteria. For instance, the BS may utilize one or more components, such as the processor 702, search space configuration module 708, the transceiver 710, the modem 712, and the one or more antennas 716, to communicate the DCI message.

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

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

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Also, as used herein, including in the claims, “or” as used in a list of items (for example, a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . a

As those of some skill in this art will by now appreciate and depending on the particular application at hand, many modifications, substitutions and variations can be made in and to the materials, apparatus, configurations and methods of use of the devices of the present disclosure without departing from the spirit and scope thereof. In light of this, the scope of the present disclosure should not be limited to that of the particular aspects illustrated and described herein, as they are merely by way of some examples thereof, but rather, should be fully commensurate with that of the claims appended hereafter and their functional equivalents.

Claims

A method of wireless communication performed by a user equipment, the method comprising:

receiving, from a base station (BS) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space;

determining a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria; and

receiving, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the prioritized search space.
The method of claim 1, wherein the receiving the search space configuration comprises receiving a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The method of claim 2, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The method of claim 3, wherein the plurality of first search spaces and the plurality of second search spaces are ordered separately by respective search space identifiers.
The method of claim 3, further comprising:

determining that the priority criteria indicates that the plurality of second search spaces has a higher priority than the plurality of first search spaces; and

allocating downlink control channel processing capability to the plurality of second search spaces in a contiguous sequence that precedes the plurality of first search spaces in a transmission slot.
The method of claim 3, further comprising:

determining that the priority criteria indicates that the plurality of first search spaces has a higher priority than the plurality of second search spaces; and

allocating downlink control channel processing capability to the plurality of first search spaces in a contiguous sequence that precedes the plurality of second search spaces in a transmission slot.
The method of claim 3, further comprising:

determining that the priority criteria indicates that the plurality of first search spaces and the plurality of second search spaces are jointly prioritized based on the search space identifier of each search space; and

allocating downlink control channel processing capability to one or more of the plurality of first search spaces and one or more of the plurality of second search spaces in an ordered sequence of search space identifiers in a transmission slot.
The method of claim 7, wherein search space identifiers in the ordered sequence correspond to different priorities of allocation for downlink control channel processing.
The method of claim 3, wherein each of the plurality of first search spaces corresponds to a set of group radio network temporary identifiers (G-RNTIs) .
The method of claim 3, wherein each of the plurality of first search spaces corresponds to a plurality of multicast sessions, and wherein each of the plurality of multicast sessions has a priority level.
The method of claim 10, further comprising:

determining whether a discontinuous reception (DRX) parameter indicates a configuration for multicast transfer;

determining which search spaces of the plurality of first search spaces correspond to one or more of the plurality of multicast sessions whose on-duration state is present in a transmission slot when the DRX parameter is determined to indicate the configuration for multicast transfer; and

prioritizing the search spaces by search space identifier that are determined to correspond to the one or more of the plurality of multicast sessions whose on-duration state is present in the transmission slot.
The method of claim 3, wherein the DCI message has a DCI format that is associated with one or more group radio network temporary identifiers (G-RNTIs) when the prioritized search space corresponds to the multicast search space type.
The method of claim 1, further comprising:

determining whether an allocation of the first search space collides with the second search space in a transmission slot;

determining a first priority of the first search space and a second priority of the second search space for the transmission slot based on the priority criteria when the allocation of the first search space is determined to collide with the second search space in the transmission slot,

wherein the determining the prioritized search space comprises determining the prioritized search space based on a comparison between the first priority and the second priority; and

allocating downlink control channel processing capability to the prioritized search space for the transmission slot.
The method of claim 1, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the receiving the DCI message comprises receiving the DCI message in one or more PDCCHs of the plurality of PDCCHs.
The method of claim 14, wherein the receiving the DCI message comprises:

decoding one or more PDCCH candidates in the prioritized search space; and

decoding the DCI message in the decoded one or more PDCCH candidates.
The method of claim 1, further comprising:

receiving, from the BS in the second frequency subband, one or more of unicast data or multicast data based on the received DCI message.
The method of claim 16, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the receiving the one or more of the unicast data or the multicast data comprises receiving the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The method of claim 1, wherein the receiving the search space configuration comprises receiving a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The method of claim 1, wherein the receiving the search space configuration comprises receiving the search space configuration indicating a third search space having a higher priority than the first search space and the second search space.
The method of claim 19, wherein the third search space corresponds to a common search space.
The method of claim 1, further comprising:

allocating a downlink control channel processing capability that includes at least one of a number of instances of decoding physical downlink control channel (PDCCH) candidates and a number of instances of decoding non-overlapping control channel elements.
A user equipment (UE) , comprising:

a transceiver configured to:

receive, from a base station (BS) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space; and

a processor configured to:

determine a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria,

wherein the transceiver is further configured to:

receive, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the prioritized search space.
The UE of claim 22, wherein the transceiver configured to receive the search space configuration is further configured to receive a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The UE of claim 23, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The UE of claim 24, wherein the plurality of first search spaces and the plurality of second search spaces are ordered separately by respective search space identifiers.
The UE of claim 24, wherein the processor is further configured to:

determine that the priority criteria indicates that the plurality of second search spaces has a higher priority than the plurality of first search spaces; and

allocate downlink control channel processing capability to the plurality of second search spaces in a contiguous sequence that precedes the plurality of first search spaces in a transmission slot.
The UE of claim 24, wherein the processor is further configured to:

determine that the priority criteria indicates that the plurality of first search spaces has a higher priority than the plurality of second search spaces; and

allocate downlink control channel processing capability to the plurality of first search spaces in a contiguous sequence that precedes the plurality of second search spaces in a transmission slot.
The UE of claim 24, wherein the processor is further configured to:

determine that the priority criteria indicates that the plurality of first search spaces and the plurality of second search spaces are jointly prioritized based on the search space identifier of each search space; and

allocate downlink control channel processing capability to one or more of the plurality of first search spaces and one or more of the plurality of second search spaces in an ordered sequence of search space identifiers in a transmission slot.
The UE of claim 28, wherein search space identifiers in the ordered sequence correspond to different priorities of allocation for downlink control channel processing.
The UE of claim 24, wherein each of the plurality of first search spaces corresponds to a set of group radio network temporary identifiers (G-RNTIs) .
The UE of claim 24, wherein each of the plurality of first search spaces corresponds to a plurality of multicast sessions, and wherein each of the plurality of multicast sessions has a priority level.
The UE of claim 31, wherein the processor is further configured to:

determine whether a discontinuous reception (DRX) parameter indicates a configuration for multicast transfer;

determine which search spaces of the plurality of first search spaces correspond to one or more of the plurality of multicast sessions whose on-duration state is present in a transmission slot when the DRX parameter is determined to indicate the configuration for multicast transfer; and

prioritize the search spaces by search space identifier that are determined to correspond to the one or more of the plurality of multicast sessions whose on-duration state is present in the transmission slot.
The UE of claim 24, wherein the DCI message has a DCI format that is associated with one or more group radio network temporary identifiers (G-RNTIs) when the prioritized search space corresponds to the multicast search space type.
The UE of claim 22, wherein the processor is further configured to:

determine whether an allocation of the first search space collides with the second search space in a transmission slot;

determine a first priority of the first search space and a second priority of the second search space for the transmission slot based on the priority criteria when the allocation of the first search space is determined to collide with the second search space in the transmission slot,

wherein the processor configured to determine the prioritized search space is further configured to determine the prioritized search space based on a comparison between the first priority and the second priority; and

allocate downlink control channel processing capability to the prioritized search space for the transmission slot.
The UE of claim 22, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the transceiver configured to receive the DCI message is further configured to receive the DCI message in one or more PDCCHs of the plurality of PDCCHs.
The UE of claim 35, wherein the transceiver configured to receive the DCI message is further configured to:

decode one or more PDCCH candidates in the prioritized search space; and

decode the DCI message in the decoded one or more PDCCH candidates.
The UE of claim 22, wherein the transceiver is further configured to:

receive, from the BS in the second frequency subband, one or more of unicast data or multicast data based on the received DCI message.
The UE of claim 37, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the transceiver configured to receive the one or more of the unicast data or the multicast data is further configured to receive the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The UE of claim 22, wherein the transceiver configured to receive the search space configuration is further configured to receive a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The UE of claim 22, wherein the transceiver configured to receive the search space configuration is further configured to receive the search space configuration indicating a third search space having a higher priority than the first search space and the second search space.
The UE of claim 40, wherein the third search space corresponds to a common search space.
The UE of claim 41, wherein the processor is further configured to:

allocate a downlink control channel processing capability that includes at least one of a number of instances of decoding physical downlink control channel (PDCCH) candidates and a number of instances of decoding non-overlapping control channel elements.
A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

code for causing a user equipment (UE) to receive, from a base station (BS) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space;

code for causing the UE to determine a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria; and

code for causing the UE to receive, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the prioritized search space.
The non-transitory computer-readable medium of claim 43, wherein the code for causing the UE to receive the search space configuration is further configured to cause the UE to receive a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The non-transitory computer-readable medium of claim 44, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The non-transitory computer-readable medium of claim 45, wherein the plurality of first search spaces and the plurality of second search spaces are ordered separately by respective search space identifiers.
The non-transitory computer-readable medium of claim 45, further comprising:

code for causing the UE to determine that the priority criteria indicates that the plurality of second search spaces has a higher priority than the plurality of first search spaces; and

code for causing the UE to allocate downlink control channel processing capability to the plurality of second search spaces in a contiguous sequence that precedes the plurality of first search spaces in a transmission slot.
The non-transitory computer-readable medium of claim 45, further comprising:

code for causing the UE to determine that the priority criteria indicates that the plurality of first search spaces has a higher priority than the plurality of second search spaces; and

code for causing the UE to allocate downlink control channel processing capability to the plurality of first search spaces in a contiguous sequence that precedes the plurality of second search spaces in a transmission slot.
The non-transitory computer-readable medium of claim 45, further comprising:

code for causing the UE to determine that the priority criteria indicates that the plurality of first search spaces and the plurality of second search spaces are jointly prioritized based on the search space identifier of each search space; and

code for causing the UE to allocate downlink control channel processing capability to one or more of the plurality of first search spaces and one or more of the plurality of second search spaces in an ordered sequence of search space identifiers in a transmission slot.
The non-transitory computer-readable medium of claim 49, wherein search space identifiers in the ordered sequence correspond to different priorities of allocation for downlink control channel processing.
The non-transitory computer-readable medium of claim 45, wherein each of the plurality of first search spaces corresponds to a set of group radio network temporary identifiers (G-RNTIs) .
The non-transitory computer-readable medium of claim 45, wherein each of the plurality of first search spaces corresponds to a plurality of multicast sessions, and wherein each of the plurality of multicast sessions has a priority level.
The non-transitory computer-readable medium of claim 52, further comprising:

code for causing the UE to determine whether a discontinuous reception (DRX) parameter indicates a configuration for multicast transfer;

code for causing the UE to determine which search spaces of the plurality of first search spaces correspond to one or more of the plurality of multicast sessions whose on-duration state is present in a transmission slot when the DRX parameter is determined to indicate the configuration for multicast transfer; and

code for causing the UE to prioritize the search spaces by search space identifier that are determined to correspond to the one or more of the plurality of multicast sessions whose on-duration state is present in the transmission slot.
The non-transitory computer-readable medium of claim 45, wherein the DCI message has a DCI format that is associated with one or more group radio network temporary identifiers (G-RNTIs) when the prioritized search space corresponds to the multicast search space type.
The non-transitory computer-readable medium of claim 43, further comprising:

code for causing the UE to determine whether an allocation of the first search space collides with the second search space in a transmission slot;

code for causing the UE to determine a first priority of the first search space and a second priority of the second search space for the transmission slot based on the priority criteria when the allocation of the first search space is determined to collide with the second search space in the transmission slot,

wherein the code for causing the UE to determine the prioritized search space is further configured to cause the UE to determine the prioritized search space based on a comparison between the first priority and the second priority; and

code for causing the UE to allocate downlink control channel processing capability to the prioritized search space for the transmission slot.
The non-transitory computer-readable medium of claim 43, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the code for causing the UE to receive the DCI message is further configured to cause the UE to receive the DCI message in one or more PDCCHs of the plurality of PDCCHs.
The non-transitory computer-readable medium of claim 56, wherein the code for causing the UE to receive the DCI message is further configured to cause the UE to:

decode one or more PDCCH candidates in the prioritized search space; and

decode the DCI message in the decoded one or more PDCCH candidates.
The non-transitory computer-readable medium of claim 43, further comprising:

code for causing the UE to receive, from the BS in the second frequency subband, one or more of unicast data or multicast data based on the received DCI message.
The non-transitory computer-readable medium of claim 58, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the code for causing the UE to receive the one or more of the unicast data or the multicast data is further configured to cause the UE to receive the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The non-transitory computer-readable medium of claim 43, wherein the code for causing the UE to receive the search space configuration is further configured to cause the UE to receive a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The non-transitory computer-readable medium of claim 43, wherein the code for causing the UE to receive the search space configuration is further configured to cause the UE to receive the search space configuration indicating a third search space having a higher priority than the first search space and the second search space.
The non-transitory computer-readable medium of claim 61, wherein the third search space corresponds to a common search space.
The non-transitory computer-readable medium of claim 43, further comprising:

code for causing the UE to allocate a downlink control channel processing capability that includes at least one of a number of instances of decoding physical downlink control channel (PDCCH) candidates and a number of instances of decoding non-overlapping control channel elements.
A user equipment (UE) , comprising:

means for receiving, from a base station (BS) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating priority criteria between the first search space and the second search space;

means for determining a prioritized search space between the first search space and the second search space to search in one or more transmission slots based on the priority criteria; and

means for receiving, from the BS in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the prioritized search space.
The UE of claim 64, wherein the means for receiving the search space configuration is further configured to receive a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The UE of claim 65, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The UE of claim 66, wherein the plurality of first search spaces and the plurality of second search spaces are ordered separately by respective search space identifiers.
The UE of claim 66, further comprising:

means for determining that the priority criteria indicates that the plurality of second search spaces has a higher priority than the plurality of first search spaces; and

means for allocating downlink control channel processing capability to the plurality of second search spaces in a contiguous sequence that precedes the plurality of first search spaces in a transmission slot.
The UE of claim 66, further comprising:

means for determining that the priority criteria indicates that the plurality of first search spaces has a higher priority than the plurality of second search spaces; and

means for allocating downlink control channel processing capability to the plurality of first search spaces in a contiguous sequence that precedes the plurality of second search spaces in a transmission slot.
The UE of claim 66, further comprising:

means for determining that the priority criteria indicates that the plurality of first search spaces and the plurality of second search spaces are jointly prioritized based on the search space identifier of each search space; and

means for allocating downlink control channel processing capability to one or more of the plurality of first search spaces and one or more of the plurality of second search spaces in an ordered sequence of search space identifiers in a transmission slot.
The UE of claim 70, wherein search space identifiers in the ordered sequence correspond to different priorities of allocation for downlink control channel processing.
The UE of claim 66, wherein each of the plurality of first search spaces corresponds to a set of group radio network temporary identifiers (G-RNTIs) .
The UE of claim 66, wherein each of the plurality of first search spaces corresponds to a plurality of multicast sessions, and wherein each of the plurality of multicast sessions has a priority level.
The UE of claim 73, further comprising:

means for determining whether a discontinuous reception (DRX) parameter indicates a configuration for multicast transfer;

means for determining which search spaces of the plurality of first search spaces correspond to one or more of the plurality of multicast sessions whose on-duration state is present in a transmission slot when the DRX parameter is determined to indicate the configuration for multicast transfer; and

means for prioritizing the search spaces by search space identifier that are determined to correspond to the one or more of the plurality of multicast sessions whose on-duration state is present in the transmission slot.
The UE of claim 66, wherein the DCI message has a DCI format that is associated with one or more group radio network temporary identifiers (G-RNTIs) when the prioritized search space corresponds to the multicast search space type.
The UE of claim 64, further comprising:

means for determining whether an allocation of the first search space collides with the second search space in a transmission slot;

means for determining a first priority of the first search space and a second priority of the second search space for the transmission slot based on the priority criteria when the allocation of the first search space is determined to collide with the second search space in the transmission slot,

wherein the means for determining the prioritized search space is further configured to determine the prioritized search space based on a comparison between the first priority and the second priority; and

means for allocating downlink control channel processing capability to the prioritized search space for the transmission slot.
The UE of claim 64, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the means for receiving the DCI message is further configured to receive the DCI message in one or more PDCCHs of the plurality of PDCCHs.
The UE of claim 77, wherein the means for receiving the DCI message is further configured to:

decode one or more PDCCH candidates in the prioritized search space; and

decode the DCI message in the decoded one or more PDCCH candidates.
The UE of claim 64, further comprising:

means for receiving, from the BS in the second frequency subband, one or more of unicast data or multicast data based on the received DCI message.
The UE of claim 79, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the means for receiving the one or more of the unicast data or the multicast data is further configured to receive the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The UE of claim 64, wherein the means for receiving the search space configuration is further configured to receive a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The UE of claim 64, wherein the means for receiving the search space configuration is further configured to receive the search space configuration indicating a third search space having a higher priority than the first search space and the second search space.
The UE of claim 82, wherein the third search space corresponds to a common search space.
The UE of claim 64, further comprising:

means for allocating a downlink control channel processing capability that includes at least one of a number of instances of decoding physical downlink control channel (PDCCH) candidates and a number of instances of decoding non-overlapping control channel elements.
A method of wireless communication performed by a base station (BS) , the method comprising:

communicating, with a user equipment (UE) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and

communicating, with the UE in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the first search space or the second search space based on the priority criteria.
The method of claim 85, wherein the communicating the search space configuration comprises transmitting a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The method of claim 86, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The method of claim 85, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the communicating the search space configuration comprises transmitting the search space configuration in one or more PDCCHs of the plurality of PDCCHs.
The method of claim 85, further comprising:

communicating, with the UE in the second frequency subband, one or more of unicast data or multicast data based on the communicated DCI message.
The method of claim 89, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the communicating the one or more of the unicast data or the multicast data comprises transmitting the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The method of claim 85, wherein the communicating the search space configuration comprises transmitting a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The method of claim 85, wherein the communicating the search space configuration comprises transmitting the search space configuration indicating a third search space having a priority greater than that of the first search space and the second search space.
The method of claim 92, wherein the third search space corresponds to a common search space.
The method of claim 85, wherein the search space configuration is a radio resource control (RRC) configuration.
A base station (BS) , comprising:

a transceiver configured to:

communicate, with a user equipment (UE) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and

communicate, with the UE in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the first search space or the second search space based on the priority criteria.
The BS of claim 95, wherein the transceiver configured to communicate the search space configuration is further configured to transmit a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The BS of claim 96, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The BS of claim 95, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the transceiver configured to communicate the search space configuration is further configured to transmit the search space configuration in one or more PDCCHs of the plurality of PDCCHs.
The BS of claim 95, wherein the transceiver is configured to:

communicate, with the UE in the second frequency subband, one or more of unicast data or multicast data based on the communicated DCI message.
The BS of claim 99, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the transceiver configured to communicate the one or more of the unicast data or the multicast data is further configured to transmit the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The BS of claim 95, wherein the transceiver configured to communicate the search space configuration is further configured to transmit a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The BS of claim 95, wherein the transceiver configured to communicate the search space configuration is further configured to transmit the search space configuration indicating a third search space having a priority greater than that of the first search space and the second search space.
The BS of claim 102, wherein the third search space corresponds to a common search space.
The BS of claim 95, wherein the search space configuration is a radio resource control (RRC) configuration.
A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

code for causing a base station (BS) to communicate, with a user equipment (UE) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and

code for causing the BS to communicate, with the UE in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the first search space or the second search space based on the priority criteria.
The non-transitory computer-readable medium of claim 105, wherein the code for causing the BS to communicate the search space configuration is further configured to cause the BS to transmit a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The non-transitory computer-readable medium of claim 106, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The non-transitory computer-readable medium of claim 105, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the code for causing the BS to communicate the search space configuration is further configured to cause the BS to transmit the search space configuration in one or more PDCCHs of the plurality of PDCCHs.
The non-transitory computer-readable medium of claim 105, further comprising:

code for causing the BS to communicate, with the UE in the second frequency subband, one or more of unicast data or multicast data based on the communicated DCI message.
The non-transitory computer-readable medium of claim 109, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the code for causing the BS to communicate the one or more of the unicast data or the multicast data is further configured to cause the BS to transmit the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The non-transitory computer-readable medium of claim 105, wherein the code for causing the BS to communicate the search space configuration is further configured to cause the BS to transmit a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The non-transitory computer-readable medium of claim 105, wherein the code for causing the BS to communicate the search space configuration is further configured to cause the BS to transmit the search space configuration indicating a third search space having a priority greater than that of the first search space and the second search space.
The non-transitory computer-readable medium of claim 112, wherein the third search space corresponds to a common search space.
The non-transitory computer-readable medium of claim 105, wherein the search space configuration is a radio resource control (RRC) configuration.
A base station (BS) , comprising:

means for communicating, with a user equipment (UE) in a first frequency subband of a plurality of frequency subbands in a first portion of a first time period, a search space configuration indicating a first search space and a second search space, the search space configuration further indicating a priority criteria between the first search space and the second search space; and

means for communicating, with the UE in a second frequency subband of the plurality of frequency subbands in a second portion of the first time period subsequent to the first portion, a downlink control information (DCI) message in the first search space or the second search space based on the priority criteria.
The BS of claim 115, wherein the means for communicating the search space configuration is further configured to transmit a first search space configuration indicating a plurality of first search spaces and a second search space configuration indicating a plurality of second search spaces, wherein each of the plurality of first search spaces and each of the plurality of second search spaces is associated with a search space identifier.
The BS of claim 116, wherein the plurality of first search spaces corresponds to a multicast search space type and the plurality of second search spaces corresponds to a unicast search space type.
The BS of claim 115, wherein:

the second frequency subband includes a plurality of physical downlink control channels (PDCCHs) multiplexed in at least one of time or frequency, and

the means for communicating the search space configuration is further configured to transmit the search space configuration in one or more PDCCHs of the plurality of PDCCHs.
The BS of claim 115, further comprising:

means for communicating, with the UE in the second frequency subband, one or more of unicast data or multicast data based on the communicated DCI message.
The BS of claim 119, wherein:

the second frequency subband includes a plurality of physical downlink shared channels (PDSCHs) multiplexed in at least one of time or frequency, and

the means for communicating the one or more of the unicast data or the multicast data is further configured to transmit the one or more of the unicast data or the multicast data in respective PDSCHs of the plurality of PDSCHs.
The BS of claim 115, wherein the means for communicating the search space configuration is further configured to transmit a first configuration indicating the first search space in a first radio resource control (RRC) message and a second configuration indicating the second search space in a second RRC message different from the first RRC message.
The BS of claim 115, wherein the means for communicating the search space configuration is further configured to transmit the search space configuration indicating a third search space having a priority greater than that of the first search space and the second search space.
The BS of claim 122, wherein the third search space corresponds to a common search space.
The BS of claim 115, wherein the search space configuration is a radio resource control (RRC) configuration.