WO2021108193A1

WO2021108193A1 - Avoid finding image nr system during full frequency scan

Info

Publication number: WO2021108193A1
Application number: PCT/US2020/061136
Authority: WO
Inventors: Yongle WU; Arvind Vardarajan Santhanam; Chinmay Shankar Vaze; Satashu Goel; Balasubramanian Ramachandran; Hee Jin Roh
Original assignee: Qualcomm Incorporated
Priority date: 2019-11-25
Filing date: 2020-11-18
Publication date: 2021-06-03

Abstract

A configuration to detect a genuine cell and refrain from camping on an image or aliased signal of a cell. The apparatus selects a scanning bandwidth for scanning for SSBs from cells on a band based on at least one of the particular band or a bandwidth of the band. The apparatus scans for the SSBs on the band with the selected scanning bandwidth.

Description

AVOID FINDING IMAGE NR SYSTEM DURING FULL FREQUENCY SCAN

CROSS REFERENCE TO RELATED APPLICATION(S)

[0001] This application claims the benefit of Indian Application No. 201941048092, entitled “Avoid Finding Image NR System During Full Frequency Scan” and filed on November 25, 2019, which is expressly incorporated by reference herein in its entirety.

BACKGROUND

Technical Field

[0002] The present disclosure relates generally to communication systems, and more particularly, to a configuration for avoiding the discovery of an image or aliasing during a full frequency scan.

Introduction

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

SUMMARY

[0005] The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0006] In some wireless systems (e.g., NR), a user equipment (UE) may conduct a full frequency scan across a wide band to detect the NR system. Ideally, the UE may conduct the full frequency scan and detect the NR system at a center frequency F_c. However, due to some radio frequency (RF) limitations, such as limited rejection capability for example, the UE while conducting the full frequency scan may detect an image of a genuine NR system. The UE may detect the image of the genuine NR system at the center frequency Fc based on a frequency related to the analog-to-digital converter (ADC) clock rate FA_DC· For example, the UE may detect the image at a first frequency Fi, where Fi = F_{c -} FA_DC· The UE may also detect the image at a second frequency F₂, where F₂ = F_c + FA_DC· The image at Fi and/or F₂ may be suppressed in comparison to the genuine signal at the center frequency F_c, and in some aspects may be suppressed approximately 40dB from the center frequency F_c. However, in instances where the NR system at the center frequency Fc is very strong, the images at Fi and/or F₂ may be sufficiently strong despite being suppressed in comparison to the center frequency F_c. In such instances, the images atFi and/or F₂ may still be well above the thermal noise floor, such that a UE may determine that the images at Fi and/or F₂ are a genuine NR system and attempt to camp on the image atFi and/or F₂. However, the UE will be unsuccessful in camping onto the image at Fi and/or F₂ because the image is not a genuine NR system signal, which may lead to false alarms. In order to overcome the issue, the present disclosure may enable a UE to determine whether a cell is a genuine NR cell and refrain from camping on an image of a genuine NR cell during a full frequency scan.

[0007] In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a device at a UE. The device may be a processor and/or a modem at a UE or the UE itself. The apparatus selects a scanning bandwidth for scanning for synchronization signal blocks (SSBs) from cells on a band based on at least one of the particular band or a bandwidth of the band. The apparatus scans for the SSBs on the band with the selected scanning bandwidth.

[0008] To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.

[0010] FIG. 2A is a diagram illustrating an example of a first frame, in accordance with various aspects of the present disclosure.

[0011] FIG. 2B is a diagram illustrating an example of DL channels within a subframe, in accordance with various aspects of the present disclosure.

[0012] FIG. 2C is a diagram illustrating an example of a second frame, in accordance with various aspects of the present disclosure.

[0013] FIG. 2D is a diagram illustrating an example of UL channels within a subframe, in accordance with various aspects of the present disclosure.

[0014] FIG. 3 is a diagram illustrating an example of abase station and user equipment (UE) in an access network.

[0015] FIG. 4 is a diagram illustrating an example of downlink signals. [0016] FIG. 5 is a diagram illustrating bandwidth (BW) to analog-to-digital converter (ADC) rate mapping.

[0017] FIG. 6 is a call flow diagram of signaling between a UE and a base station.

[0018] FIG. 7 is a flowchart of a method of wireless communication.

[0019] FIG. 8 is a flowchart of a method of wireless communication.

[0020] FIG. 9 is a diagram illustrating an example of a hardware implementation for an example apparatus.

DETAILED DESCRIPTION

[0021] 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 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.

[0022] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0023] By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure. One or more processors in the processing system may execute software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0024] Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.

[0025] FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100. The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC)). The base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station). The macrocells include base stations. The small cells include femtocells, picocells, and microcells.

[0026] The base stations 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 through first backhaul links 132 (e.g., SI interface). The base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network 190 through second backhaul links 184. In addition to other functions, the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface). The first backhaul links 132, the second backhaul links 184, and the third backhaul links 134 may be wired or wireless.

[0027] The base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102. A network that includes both small cell and macrocells may be known as a heterogeneous network. A heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG). The communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from abase station 102 to aUE 104. The communication links 120 may use multiple- in put and multiple -output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity. The communication links may be through one or more carriers. The base stations 102 / UEs 104 may use spectrum up to 7MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction. The carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respectto DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL). The component carriers may include a primary component carrier and one or more secondary component carriers. A primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell). [0028] Certain UEs 104 may communicate with each other using device-to-device (D2D) communication link 158. The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0029] The wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like. When communicating in an unlicensed frequency spectrum, the STAs 152 / AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.

[0030] The small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.

[0031] The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). The frequencies between FR1 and FR2 are often referredto as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

[0032] With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band.

[0033] Abase station 102, whether a small cell 102' or a large cell (e.g., macro base station), may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station. Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE 104. When the gNB 180 operates in millimeter wave or near millimeter wave frequencies, the gNB 180 may be referred to as a millimeter wave base station. The millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the path loss and short range. The base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming.

[0034] The base station 180 may transmit abeamformed signal to the UE 104 in one or more transmit directions 182'. The UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182". The UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions. The base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions. The base station 180 / UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 / UE 104. The transmit and receive directions for the base station 180 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

[0035] The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176. The IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.

[0036] The core network 190 may include a Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and aUser Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196. The AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195. The UPF 195 provides UEIP address allocation as well as other functions. The UPF 195 is connected to the IP Services 197. The IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switch (PS) Streaming (PSS) Service, and/or other IP services.

[0037] The base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmit reception point (TRP), or some other suitable terminology. The base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104. Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, amultimedia device, a video device, adigital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device. Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.). The UE 104 may also be referredto as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0038] Referring again to FIG. 1, in certain aspects, the UE 104 may be configured to avoid finding an image of an NR cell during a full frequency scan. For example, the UE 104 may include a selection component 198 configured to select a scanning bandwidth for scanning SSBs from cells. The UE 104 may select a scanning bandwidth for scanning for SSBs from cells on a band based on at least one of the particular band or a bandwidth of the band. The UE 104 may scan for the SSBs bon the band with the selected scanning bandwidth.

[0039] Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0040] FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure. FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe. FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure. FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe. The 5G NR frame structure may be frequency division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL. In the examples provided by FIGs. 2A, 2C, the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible for use between DL/UL, and subframe 3 being configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols. UEs are configured with the slot format (dynamically through DL control information (DCI), or semi- statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI). Note that the description infra applies also to a 5G NR frame structure that is TDD.

[0041] Other wireless communication technologies may have a different frame structure and/or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on DL may be cyclic prefix (CP) orthogonal frequency division multiplexing (OFDM) (CP -OFDM) symbols. The symbols on UL may be CP -OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also referred to as single carrier frequency-division multiple access (SC-FDMA) symbols) (for power limited scenarios; limited to a single stream transmission). The number of slots within a subframe is based on the slot configuration and the numerology. For slot configuration 0, different numerologies m 0 to 4 allow for 1, 2, 4, 8, and 16 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology m, there are 14 symbols/slot and 2r slots/subframe. The subcarrier spacing and symbol length/duration are a function of the numerology. The subcarrier spacing may be equal to 2^m * 15 kHz, where m is the numerology 0 to 4. As such, the numerology m=0 has a subcarrier spacing of 15 kHz and the numerology m=4 has a subcarrier spacing of 240 kHz. The symbol length/duration is inversely related to the subcarrier spacing. FIGs. 2A-2D provide an example of slot configuration 0 with 14 symbols per slot and numerology m=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 ps. Within a set of frames, there may be one or more different bandwidth parts (BWPs) (see FIG. 2B) that are frequency division multiplexed. Each BWP may have a particular numerology.

[0042] A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. [0043] As illustrated in FIG. 2A, some of the REs carry reference (pilot) signals (RS) for the UE. The RS may include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).

[0044] FIG. 2B illustrates an example of various DL channels within a subframe of a frame.

The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) (e.g., 1, 2, 4, 8, or 16 CCEs), each CCE including six RE groups (REGs), each REG including 12 consecutive REs in an OFDM symbol of an RB. A PDCCH within one BWP may be referred to as a control resource set (CORESET). A UE is configured to monitor PDCCH candidates in a PDCCH search space (e.g., common search space, UE-specific search space) during PDCCH monitoring occasions on the CORESET, where the PDCCH candidates have different DCI formats and different aggregation levels. Additional BWPs may be located at greater and/or lower frequencies across the channel bandwidth. A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE 104 to determine subframe/symbol timing and a physical layer identity. A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the aforementioned DM-RS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS)/PBCH block (also referred to as SS block (SSB)). The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages.

[0045] As illustrated in FIG. 2C, some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmited in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmited in different configurations depending on whether short or long PUCCHs are transmited and depending on the particular PUCCH format used. The UE may transmit sounding reference signals (SRS). The SRS may be transmited in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency- dependent scheduling on the UL.

[0046] FIG. 2D illustrates an example of various UL channels within a subframe of a frame.

The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and hybrid automatic repeat request (HARQ) acknowledgment (ACK) (HARQ-ACK) information (ACK / negative ACK (NACK)) feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and/or UCI.

[0047] FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller/processor 375. The controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer. The controller/processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIBs), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0048] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/ demodulation of physical channels, and MIMO antenna processing. The TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BP SK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing. The channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318 TX. Each transmitter 318 TXmay modulate an RF carrier with a respective spatial stream for transmission.

[0049] At the UE 350, each receiver 354 RX receives a signal through its respective antenna 352. Each receiver 354 RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 310. These soft decisions may be based on channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.

[0050] The controller/processor 359 can be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller/processor 359 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

[0051] Similar to the functionality described in connection with the DL transmission by the base station 310, the controller/processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0052] Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission. [0053] The UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

[0054] The controller/processor 375 can be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 350. IP packets from the controller/processor 375 may be provided to the EPC 160. The controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.

[0055] At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with 198 of FIG. 1.

[0056] FIG. 4 is a diagram 400 illustrating an example of downlink signals. In some wireless systems (e.g., NR), a user equipment (UE) may conduct a full frequency scan across a wide band to detect the NR system. Ideally, the UE may conduct the full frequency scan and detect a genuine signal 402 of the NR system, for example, at a center frequency F_c 404. However, due to some radio frequency (RF) limitations, such as limited rejection capability for example, the signal(s) 406 that the UE detects while conducting the full frequency scan may include the detection of an image (e.g., 408, 410) of the genuine NR system (e.g., F_c 404). The UE may detect the image (e.g., 408, 410) of the genuine NR system at the center frequency Fc 404 based on a frequency related to the analog-to-digital converter (ADC) clock rate FADC· For example, the UE may detect the image at a first frequency Fi 408, where Fi = F_{c -} FADC· The UE may also detect the image at a second frequency F₂ 410, where F₂ = F_c + FADC· The image at Fi 408 and/or F₂ 410 may be suppressed in comparison to the magnitude 412 of the genuine signal at the center frequency F_c 404, and in some aspects may be suppressed approximately 40dB from the center frequency F_c 404. However, in instances where the NR system at the center frequency Fc is very strong, the images atFi 408 and/or F₂410 maybe sufficiently strong despite being suppressed in comparison to the center frequency F_c 404. In such instances, the images atFi 408 and/or F₂ 410 may still be well above the thermal noise floor, such that a UE may determine that the images at Fi 408 and/or F₂ 410 are a genuine NR system and may attempt to camp on the image at Fi 408 and/or F₂ 410. However, the UE will be unsuccessful in camping onto the image at Fi and/or F₂ because the image is not a genuine NR system signal, which may lead to false alarms.

[0057] False alarms may introduce significant delays for UEs to camp onto a genuine NR cell (e.g., at center frequency F_c). When a UE detects an image that is not a genuine NR cell, the UE is not aware that the image is not a genuine NR cell and will proceed to attempt to camp onto the image. The UE may attempt to decode PSS, SSS, and/or PBCH of the image, which may pass. In addition, even the SIB may pass because it may show up at the image position (e.g., Fi 408 and/or F₂ 410). The time tracking loop (TTL) may show a fast drift, but may not necessarily lead to failure. The UE may additionally attempt a random access channel (RACH) procedure with the image, but there will not be any response, because the image is not a genuine signal of a NR cell. As a result, the UE will suffer radio link failure after a maximum number of RACH attempts have been exhausted. This process may take an extended period of time, which may prevent the UE from camping onto a genuine NR cell.

[0058] Additionally, the false alarms may impact the UEin finding and/or detecting genuine NR cells. The network may convey some side information on the payload of the PBCH, such as but not limited to, the location of the nearest cell-defining SSBs or a range that the UE can skip during the scan, with respect to the current SSB location. The false alarm cell may have the correct PBCH payload, but may have the incorrect SSB location, which may negatively impact where the UE should scan for NR cells.

[0059] In an effort to overcome the issue, in some instances, such as in stand-alone (SA) mode, a constraint may be included, such that both the genuine NR system and an image of the NR system must fall on Global Synchronization Channel Number (GSCN) points. In SA mode a UE may need to blindly detect SSB since the UE may need to detect the NR system for initial acquisition. Having a UE search for SSBs based on GSCN points may allow the UE to ignore or refrain from attempting to camp on non-genuine NR cells. For example, with GSCN points, NR cells are located in accordance with the GSCN constraints, such that SSBs are transmitted based on the GSCN raster. In addition, FADC may be a multiple of the GSCN step size (e.g., 1.44 MHz for bands n41, n77-n79). However, in non-stand alone (NS A) mode, it is not necessary for SSBs to be transmitted based on the GSCN raster because NR systems may be aided by legacy (e.g., pre-NR) infrastructure. In addition, in NS A mode, there is no SIB transmitted by a NR base station, and the UE may not be stuck trying to camp on the image of the NR system for an extended period of time. During a full frequency scan, the UE may only search over the GSCN rasters, such that the UE may not detect an image of an NR cell if the image does not fall on a GSCN raster, which may assist the UE in preventing from camping onto the image of the NR cell.

[0060] FIG. 5 is a diagram 500 illustrating a BW to ADC rate mapping. Diagram 500 provides the ADC rate for bands n77-n79 502 and for band n41 502. In the diagram 500, the ADC rates of 230.40 MHz and 460.80 MHz in band n77-n79 502 and the ADC rate of 115.20 MHz in band n41 504 may experience the image problem discussed above. The ADC rate of 230.40 may have a BW of either 15 MHz or 20 MHz in band n77-n779 502, while the ADC rate of 460.80 may have a BW of either 50 or 60 MHz in band n77-n779 502. In addition, the ADC rate of 115.20 MHz may have a BW of 10 MHz in band n41 502. The band n77 may have a BW of 900MHz, the band n78 may have a BW of 500 MHz, the band n79 may have a BW of 600 MHz, while the band n41 may have a BW of 194 MHz. There could be multiple ADC rate candidates for the same BW, because they may be used for different portions of the band in order to avoid image and/or spur problems. The BW to ADC rate mapping of FIG. 5 is an example ofBW to ADC rate mapping and the disclosure is not intended to be limited to the aspects disclosed herein. For example, the BW to ADC rate mapping may vary such that the values are greater than or less than the examples provided in FIG. 5.

[0061] In instances where the GSCN constraint is present, for a full frequency scan, the desired BW may be calculated based on up to 4 raster candidates with some margin, but may overwrite for band n41, n77-n79 in order to avoid problematic ADC rates. For example, for band n41, if the BW is 10 MHz, then the BW may be changed to 15 MHz. For band n77-n79, if the BW is 15 or 20 MHz, then the BW may be changed to 40 MHz, or if the BW is 50 or 60 MHz, then the BW may be changed to 80 MHz.

[0062] In instances where the GSCN constraint is not present, during the full frequency scan, the UE may need to force a higher ADC rate (e.g., high RF BW) for n41, n77, n78, and n79 (e.g., n41: 194MHz; n77: 900MHz; n78: 500MHz; n79: 600MHz). In some aspects, for band n41, the BW may be set to a minimum of 20 MHz (e.g., 230.4 MHz ADC). In some aspects, for band n78 and/or n79, the BW may be set to a minimum 80 MHz (e.g., at least 614.4 MHz ADC). In some aspects, for band n77, the BW may be set to 100 MHz (e.g., 729.6 MHz ADC). In some instances, the left and right edge of band n77 (e.g., approximately 170 MHz on either edge) may be the only regions that may be affected by the change of the scanning BW.

[0063] In some aspects, for example, when a cell is detected on a GSCN raster that falls into the affected region, the UE may need to determine whether the RSRP is greater than a predetermined threshold (e.g., -85 dBm). The UE may need to determine whether the RSRP is greater than the predetermined threshold to determine whether the signal is a genuine NR cell or if there is a possibility the signal is an image of an NR cell.

[0064] In instances where the RSRP is not greater than the threshold, the signal may be determined to be a potentially non-genuine NR cell. As such, RRC may ignore the cell-defining SSB related information carried by the MIB payload. After the BW has been updated based on SIB1 control resource set (CORESET), such that the ADC rate has been changed and do not expect to see the same cell again if it were an image, the UE may force a search along with SIB 1 decoding. If the search fails to detect a genuine cell, then the UE may consider the particular GSCN raster point as an image and stop decoding. In some aspects, RRC signaling may be configured to bar the cell for a period of time, as a secondary optimization technique. The UE may also be configured to store and/or utilize additional information (e.g., camping history, geographic information, or some shared database) in an effort to avoid future scanning of the image of the NR cell.

[0065] FIG. 6 is a call flow diagram 600 of signaling between a UE 602 and a base station 604. The base station 604 may be configured to provide at least one cell. The UE 602 may be configured to communicate with the base station 604. For example, in the context of FIG. 1, the base station 604 may correspond to base station 102/180 and, accordingly, the cell may include a geographic coverage area 110 in which communication coverage is provided and/or small cell 102’ having a coverage area 110’. Further, a UE 602 may correspond to at least UE 104. In another example, in the context of FIG. 3, the base station 604 may correspond to base station 310 and the UE 602 may correspond to UE 350. Optional aspects are illustrated with a dashed line.

[0066] As illustrated at 606, the UE 602 may select a scanning bandwidth for scanning for synchronization signal blocks (SSBs) on a band. The UE 602 may select the scanning bandwidth for scanning for SSBs from cells on the band based on at least one of the particular band or a bandwidth of the band. [0067] In some aspects, the SSBs may be constrained to particular raster candidates within the band based on a raster candidate step size associated with a global synchronization raster channel (GSRC) constraint. In such aspects, for example as illustrated at 608, the UE 602, to select the scanning bandwidth may be configured to determine an initial scanning bandwidth.

[0068] In some aspects, for example as illustrated at 610, the UE 602, to select the scanning bandwidth, may determine whether the initial scanning bandwidth for the band corresponds to a receive (Rx) analog-to-digital converter (ADC) clock rate that is a multiple of the raster candidate step size.

[0069] In some aspects, for example as illustrated at 612, the UE 602 may be configured to increase the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of the raster candidate step size. The UE 602 may increase the scanning bandwidth in response to the determination that the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size. In some aspects, to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate is a multiple of a raster candidate step size, the UE 602 may determine whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz. The scanning bandwidth may be increased upon the determination that the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz. In some aspects, the scanning bandwidth may be increased to 15 MHz. In some aspects, to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of a raster candidate step size, the UE 602 may determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz. In such aspects, the scanning bandwidth may be increased upon the determination that the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20MHz. In some aspects, the scanning bandwidth may be increased to 40 MHz. In yet some aspects, to determine whether the initial scanning bandwidth for the band corresponds to a Rx ADC clock rate that is a multiple of a raster candidate step size, the UE 602 may determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz. In such aspects, the scanning bandwidth may be increased upon the determination that the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz. In some aspects, the scanning bandwidth may be increased to 80 MHz.

[0070] In some aspects, for example as illustrated at 614, the UE 602, to select the scanning bandwidth may be configured determine whether the band corresponds to a band in a set of bands. In some aspects, the set of bands may comprise band n41, band n78, and band n79. In some aspects, the UE 602 may be configured to set the scanning bandwidth such that the Rx ADC clock rate that corresponds to the scanning bandwidth is greater than the bandwidth. In some aspects, the scanning bandwidth may be set to a minimum of 20 MHz for band n41 and to a minimum of 80 MHz for band n78 and band n79. In some aspects, the UE 602 may be configured to set the scanning bandwidth such that the Rx ADC clock rate that corresponds to the scanning bandwidth is maximized. In such aspects, the set of bands may comprise band n77 with the scanning bandwidth set to 100 MHz.

[0071] As illustrated at 618, the UE 602 may scan for the SSBs on the band with the selected scanning bandwidth. The UE 602 may scan for the SSBs in the downlink signal 616 transmitted from the base station 604. In some aspects, the SSBs may be scanned on the band based on historical information associated with ghost cell frequencies.

[0072] In some aspects, for example as illustrated at 620, the UE 602 may be configured to detect a cell at a frequency F_c. The UE may detect the cell at the frequency F_c based on the scanned SSBs.

[0073] In some aspects, for example as illustrated at 622, the UE 602 may be configured to determine whether the scanned SSB has a reference signal received power (RSRP) greater than a threshold. The scanned SSB having an RSRP greater than the threshold may be utilized by the UE 602 to determine that the scanned SSB is a genuine signal and not an aliased signal or an image of a genuine signal.

[0074] In some aspects, for example as illustrated at 624, the UE 602 may be configured to camp on the cell. The UE 602 may camp on the cell in response to the determination that the scanned SSB has an RSRP greater than the threshold. The UE 602 may determine that the scanned SSB is a genuine signal for a cell when the scanned SSB has an RSRP greater than the threshold.

[0075] In some aspects, for example, in instances where the scanned SSB does not have an RSRP greater than the threshold and the selected scanning bandwidth is a first scanning bandwidth, the UE 602 may be configured to ignore cell-defining SSB information carried by a PBCH payload. The UE 602 may determine that the scanned SSB is likely not a genuine signal from a cell or is an aliased signal or an image of a genuine signal based on the scanned SSB not having an RSRP greater than the threshold. In such aspects, the UE 602 may be configured to change the first scanning bandwidth to a second scanning bandwidth. The UE 602 may be configured to re scan for the SSBs on the band with the selected second scanning bandwidth. The UE 602 may determine whether the cell is detected again at the frequency F_c based on the scanned SSBs. The UE 602 may be configured to refrain from camping on the cell in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs. In some aspects, the UE 602 may store information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c. The UE 602 may store such information associated with the frequency F_c in response to the determination that the cell is undetected at the frequency F_c based on the re scanned SSBs. In some aspects, additional scanning of SSBs on the band may be based on the stored information. The SSBs may be scanned on the band based on historical information associated with ghost cell frequencies. Ghost cell frequencies may be frequencies in which the cell is undetected upon switching the first scanning bandwidth to the second scanning bandwidth and performing a re-scan for the SSBs on the band with the second scanning bandwidth.

[0076] FIG. 7 is a flowchart 700 of a method of wireless communication. The method may be performed by aUE or a component of a UE (e.g., the UE 104, 602; the apparatus 902; the cellular baseband processor 904, which may include the memory 360 and which may be the entire UE 350 or a component of the UE 350, such as the TX processor 368, the RX processor 356, and/or the controller/processor 359). One or more of the illustrated operations may be omitted, transposed, or contemporaneous . Optional aspects are illustrated with a dashed line. The method may enable a UE to detect a genuine NR cell and refrain from camping on an image or aliased signal of an NR cell.

[0077] At 702, the UE may select a scanning bandwidth for scanning for SSBs from cells on a band. For example, 702 may be performed by bandwidth component 940 of apparatus 902. The UE may select the scanning bandwidth for scanning for SSBs from cells on the band based on at least one of a particular band or a bandwidth of the band.

[0078] In some aspects, for example at 704, the UE may determine an initial scanning bandwidth. For example, 704 may be performed by bandwidth component 940 of apparatus 902. In some aspects, the SSBs may be constrained to particular raster candidates with the band based on a raster candidate step size associated with a GSRC constraint. In such aspects, the UE may determine the initial scanning bandwidth, in order to select the scanning bandwidth.

[0079] In some aspects, for example at 706, the UE, to select the scanning bandwidth, may determine whether the initial scanning bandwidth for the band corresponds to a Rx ADC clock rate. For example, 706 may be performed by bandwidth component 940 of apparatus 902. The UE may determine whether the initial scanning bandwidth for the band corresponding to the Rx ADC clock rate is a multiple of the raster candidate step size.

[0080] In some aspects, for example at 708, the UE may increase the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of candidate step size. For example, 708 may be performed by bandwidth component 940 of apparatus 902. The UE may increase the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of candidate step size in response to the determination that the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size.

[0081] In some aspects, for example at 710, the UE may determine whether the band corresponds to a band in a set of bands. For example, 710 may be performed by bandwidth component 940 of apparatus 902. In some aspects, the set of bands may comprise at least one of band n41, band n77, band n78, or band n79. In some aspects, the UE may determine whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz. The UE may determine whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz in order to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate is a multiple of a raster candidate step size. In some aspects, the bandwidth may be increased upon the determination that the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz. In some aspects, the scanning bandwidth may be increased to 15 MHz. In some aspects, the UE, to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of a raster candidate step size, may determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz. In some aspects, the scanning bandwidth may be increased to 40 MHz. In some aspects, the UE, to determine whether the initial scanning bandwidth for the band corresponds to a Rx ADC clock rate that is a multiple of a raster candidate step size, may determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz. In some aspects, the scanning bandwidth may be increased upon the determination that the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz. In some aspects, the scanning bandwidth may be increased to 80 MHz.

[0082] In some aspects, for example at 712, the UE may set the scanning bandwidth. For example, 712 may be performed by bandwidth component 940 of apparatus 902. The UE may set the scanning bandwidth such that a Rx ADC clock rate corresponding to the scanning bandwidth is greater than the bandwidth. For example, the scanning bandwidth may be set to a minimum of 20 MHz for band n41 and to a minimum of 80 MHz for band n78 or band n79, in instances where the set of bands comprise band n41, band n78, or band n79.

[0083] In some aspects, for example at 714, the UE may set the scanning bandwidth such that aRx ADC clock rate corresponding to the scanning bandwidth is maximized. For example, 714 may be performed by bandwidth component 940 of apparatus 902. In some aspects, the scanning bandwidth may be set to lOOMHz for band n77, in instances where the set of bands comprises band n77.

[0084] At 716, the UE may scan for the SSBs on the band with the selected scanning bandwidth. For example, 716 may be performed by scan component 942 of apparatus 902. In some aspects, the SSBs may be scanned on the band based on historical information associated with ghost cell frequencies.

[0085] In some aspects, for example at 718, the UE may detect a cell at a frequency F_c. For example, 718 may be performed by cell component 944 of apparatus 902. The UE may detect the cell at the frequency F_c based on the scanned SSBs.

[0086] In some aspects, for example at 720, the UEmay determine whether the scanned SSB has an RSRP greater than a threshold. For example, 720 may be performed by determination component 946 of apparatus 902. In some aspects, the threshold may be -85 dBm. In some aspects, the threshold may be greater than or less than -85 dBm, and the disclosure is not intended to be limited to the aspects provided herein.

[0087] In some aspects, for example at 722, the UE may camp on the cell. For example, 722 may be performed by cell component 944 of apparatus 902. The UE may camp on the cell in response to the determination that the scanned SSB has an RSRP greater than the threshold.

[0088] FIG. 8 is a flowchart 800 of a method of wireless communication, for example, in instances where the scanned SSB does not have an RSRP greater than the threshold, as discussed above in 720 of FIG. 7. In some aspects, for example, when the scanned SSB has an RSRP less than the threshold the UE does not directly camp on the cell. In some aspects, for example at 802, the UE may ignore cell-defining SSB information carried by a PBCH payload. For example, 802 may be performed by ignore component 948 of apparatus 902.

[0089] In some aspects, for example at 804, the UE may change the first scanning bandwidth. For example, 804 may be performed by bandwidth component 940 of apparatus 902. The UE may change the first scanning bandwidth to a second scanning bandwidth. In some aspects, the selected scanning bandwidth may be the first scanning bandwidth.

[0090] In some aspects, for example at 806, the UEmay re-scan for the SSBs. For example, 806 may be performed by bandwidth component 940 of apparatus 902. The UE may re-scan for the SSBs on the band with the selected second scanning bandwidth.

[0091] In some aspects, for example at 808, the UE may determine whether the cell may be detected again at the frequency F_c. For example, 808 may be performed by determination component 946 of apparatus 902. The UE may determine whether the cell may be detected again at the frequency F_c based on the scanned SSBs.

[0092] In some aspects, for example at 814, if the UE determines that the cell is detected again at the frequency F_c, then the UE may camp onto the cell. For example, 814 may be performed by cell component 944 of apparatus 902. In some aspects, if the UE determines that the cell is not detected again at the frequency F_c, then the UE may proceed to 810.

[0093] In some aspects, for example at 810, the UE may refrain from camping on the cell. For example, 810 may be performed by cell component 944 of apparatus 902. The UE may refrain from camping on the cell in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs.

[0094] In some aspects, for example at 812, the UE may store information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c. For example, 812 may be performed by store component 950 of apparatus 902. The UE may store information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs. The additional scanning of SSBs on the band may be based on the stored information.

[0095] FIG. 9 is a diagram 900 illustrating an example of a hardware implementation for an apparatus 902. The apparatus 902 is a UE and includes a cellular baseband processor 904 (also referred to as a modem) coupled to a cellular RF transceiver 922 and one or more subscriber identity modules (SIM) cards 920, an application processor 906 coupled to a secure digital (SD) card 908 and a screen 910, a Bluetooth module 912, a wireless local area network (WLAN) module 914, a Global Positioning System (GPS) module 916, and a power supply 918. The cellular baseband processor 904 communicates through the cellular RF transceiver 922 with the UE 104 and/or BS 102/180. The cellular baseband processor 904 may include a computer-readable medium / memory. The computer-readable medium / memory may be non-transitory. The cellular baseband processor 904 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory. The software, when executed by the cellular baseband processor 904, causes the cellular baseband processor 904 to perform the various functions described supra. The computer-readable medium / memory may also be used for storing data that is manipulated by the cellular baseband processor 904 when executing software. The cellular baseband processor 904 further includes a reception component 930, a communication manager 932, and a transmission component 934. The communication manager 932 includes the one or more illustrated components. The components within the communication manager 932 may be stored in the computer- readable medium / memory and/or configured as hardware within the cellular baseband processor 904. The cellular baseband processor 904 may be a component of the UE 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359. In one configuration, the apparatus 902 may be a modem chip and include just the cellular baseband processor 904, and in another configuration, the apparatus 902 may be the entire UE (e.g., see 350 of FIG. 3) and include the aforediscussed additional modules of the apparatus 902.

[0096] The communication manager 932 includes a bandwidth component 940 that is configured to select a scanning bandwidth for scanning for SSBs from cells on a band, e.g., as described in connection with 702 of FIG. 7. The bandwidth component 940 may be configured to determine an initial scanning bandwidth, e.g., as described in connection with 704 of FIG. 7. The bandwidth component 940 may be configured to select the scanning bandwidth, may determine whether the initial scanning bandwidth for the band corresponds to aRx ADC clock rate, e.g., as described in connection with 706 of FIG. 7. The bandwidth component 940 may be configured to increase the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of candidate step size, e.g., as described in connection with 708 of FIG. 7. The bandwidth component 940 may be configured to determine whether the band corresponds to a band in a set of bands, e.g., as described in connection with 710 of FIG. 7. The bandwidth component 940 may be configured to set the scanning bandwidth, e.g., as described in connection with 712 of FIG. 7. The bandwidth component 940 may be configured to set the scanning bandwidth such that a Rx ADC clock rate corresponding to the scanning bandwidth is maximized, e.g., as described in connection with 714 of FIG. 7. The bandwidth component 940 may be configured to change the first scanning bandwidth, e.g., as described in connection with 804 of FIG. 8. The bandwidth component 940 may be configured to re-scan for the SSBs, e.g., as described in connection with 806 of FIG. 8. The communication manager 932 further includes a scan component 942 that is configured to scan for the SSBs on the band with the selected scanning bandwidth, e.g., as described in connection with 716 of FIG. 7. The communication manager 932 further includes a cell component 944 that is configured to detect a cell at a frequency F_c, e.g., as described in connection with 718 of FIG. 7. The cell component 944 may be configured to camp on the cell, e.g., as described in connection with 722 of FIG. 7 or 814 of FIG. 8. The cell component 944 may be configured to refrain from camping on the cell, e.g., as described in connection with 810 of FIG. 8. The communication manager 932 further includes a determination component 946 that is configured to determine whether the scanned SSB has an RSRP greater than a threshold, e.g., as described in connection with 720 of FIG. 7. The determination component 946 may be configured to determine whether the cell may be detected again at the frequency F_c, e.g., as described in connection with 808 of FIG. 8. The communication manager 932 further includes an ignore component 948 that is configured to ignore cell-defining SSB information carried by a PBCH payload, e.g., as described in connection with 802 of FIG. 8. The communication manager 932 further includes store component 950 that is configured to store information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c, e.g., as described in connection with 812 of FIG. 8.

[0097] The apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGs. 7 or 8. As such, each block in the aforementioned flowcharts of FIGs. 7 or 8 may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

[0098] In one configuration, the apparatus 902, and in particular the cellular baseband processor 904, includes means for selecting a scanning bandwidth for scanning for SSBs from cells on a band based on at least one of a particular band or a bandwidth of the band. The apparatus includes means for scanning for the SSBs on the band with the selected scanning bandwidth. The means for selecting the scanning bandwidth may be configured to determine an initial scanning bandwidth. The means for selecting the scanning bandwidth may be configured to determine whether the initial scanning bandwidth for the band corresponds to a Rx ADC clock rate that is a multiple of the raster candidate step size. The means for selecting the scanning bandwidth may be configured to increase the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of candidate step size in response to the determination that the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size. The means for selecting the scanning bandwidth may be configured to determine whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz. The scanning bandwidth may be increased upon determining the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz. The means for selecting the scanning bandwidth may be configured to determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz. The scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz. The means for selecting the scanning bandwidth may be configured to determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz. The scanning bandwidth may be increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz. The means for selecting the scanning bandwidth may be configured to determine whether the band corresponds to a band in a set of bands. The means for selecting the scanning bandwidth may be configured to set the scanning bandwidth such that a Rx ADC clock rate corresponding to the scanning bandwidth is greater than the bandwidth. The means for selecting the scanning bandwidth may be configured to set the scanning bandwidth such that a Rx ADC clock rate corresponding to the scanning bandwidth is maximized. The apparatus further includes means for detecting a cell at a frequency Fc based on the scanned SSBs. The apparatus further includes means for determining whether the scanned SSB has a RSRP greater than a threshold. The apparatus further includes means for camping on the cell in response to the determination that the scanned SSB has an RSRP greater than the threshold. The apparatus further includes means for ignoring cell-defining SSB information carried by a PBCH payload. The apparatus further includes means for changing the first scanning bandwidth to a second scanning bandwidth. The apparatus further includes means for re-scanning for the SSBs on the band with the selected second scanning bandwidth. The apparatus further includes means for determining whether the cell is detected again at the frequency Fc based on the scanned SSBs. The apparatus further includes means for refraining from camping on the cell in response to the determination that the cell is undetected at the frequency Fc based on the re-scanned SSBs. The apparatus further includes means for storing information associated with the frequency Fc for avoiding future scanning for SSBs on the frequency Fc in response to the determination that the cell is undetected at the frequency Fc based on the re-scanned SSBs. The additional scanning of SSBs on the band is based on the stored information. The aforementioned means may be one or more of the aforementioned components of the apparatus 902 configured to perform the functions recited by the aforementioned means. As described supra , the apparatus 902 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359. As such, in one configuration, the aforementioned means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the aforementioned means.

[0099] The present disclosure relates to a communication system in which a UE may be configured to determine whether a cell is a genuine NR cell and refrain from camping on an image of a genuine NR cell during a full frequency scan. The UE may be configured to select a scanning bandwidth for scanning for SSBs from cells on a band based on at least one of the particular band or a bandwidth of the band. The SSBs may be constrained to particular raster candidates based on a GSRC constraint. At least one advantage of the disclosure is that the particular raster candidates based on the GSRC constraint assist the UE in refraining from attempting to camp on an image of an NR cell, because images that do not fall on the particular raster candidates may not be scanned and/or detected by the UE. This may assist in the UE properly detecting a genuine NR cell, as well as preventing radio link failure. Yet another advantage of the disclosure is that the scanning bandwidth may be changed to minimize or eliminate any potential issues between the scanning bandwidth and the Rx ADC clock rate that may be similar to a raster candidate step size.

[00100] It is understood that the specific order or hierarchy of blocks in the processes / flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes / flowcharts may be rearranged. Further, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

[00101] The following examples are illustrative only and may be combined with aspects of other embodiments or teachings described herein, without limitation.

[00102] Aspect 1 is a method of wireless communication at a UE comprising selecting a scanning bandwidth for scanning for SSBs from cells on a band based on at least one of a particular band or a bandwidth of the band; and scanning for the SSBs on the band with the selected scanning bandwidth.

[00103] In Aspect 2, the method of Aspect 1 further includes that the SSBs are constrained to particular raster candidates within the band based on a raster candidate step size associated with a GSRC constraint, wherein the selecting the scanning bandwidth further includes determining an initial scanning bandwidth; determining whether the initial scanning bandwidth for the band corresponds to a Rx ADC clock rate that is a multiple of the raster candidate step size; and increasing the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of candidate step size in response to the determination that the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size.

[00104] In Aspect 3, the method of Aspect 1 or 2 further includes that the determining whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size further includes determining whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz.

[00105] In Aspect 4, the method of any of Aspects 1-3 further includes that the scanning bandwidth is increased to 15 MHz.

[00106] In Aspect 5, the method of any of Aspects 1-4 further includes that the determining whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size further includes determining whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz.

[00107] In Aspect 6, the method of any of Aspects 1-5 further includes that the scanning bandwidth is increased to 40 MHz.

[00108] In Aspect 7, the method of any of Aspects 1-6 further includes that the determining whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size further includes determining whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz.

[00109] In Aspect 8, the method of any of Aspects 1-7 further includes that the scanning bandwidth is increased to 80 MHz.

[00110] In Aspect 9, the method of any of Aspects 1-8 further includes that the selecting the scanning bandwidth further includes determining whether the band corresponds to a band in a set of bands; and setting the scanning bandwidth such that aRx ADC clock rate corresponding to the scanning bandwidth is greater than the bandwidth.

[00111] In Aspect 10, the method of any of Aspects 1-9 further includes that the set of bands comprises band n41, band n78, and band n79, and the scanning bandwidth is set to a minimum of 20 MHz for band n41 and to a minimum of 80 MHz for band n78 and band n79.

[00112] In Aspect 11, the method of any of Aspects 1-10 further includes that the selecting the scanning bandwidth further includes determining whether the band corresponds to a band in a set of bands; and setting the scanning bandwidth such that a Rx ADC clock rate corresponding to the scanning bandwidth is maximized.

[00113] In Aspect 12, the method of any of Aspects 1-11 further includes that the set of bands comprises band n77, and the scanning bandwidth is set to 100 MHz.

[00114] In Aspect 13, the method of any of Aspects 1-12 further includes detecting a cell at a frequency F_c based on the scanned SSBs; determining whether the scanned SSB has a reference signal received power (RSRP) greater than a threshold; and camping on the cell in response to the determination that the scanned SSB has an RSRP greater than the threshold.

[00115] In Aspect 14, the method of any of Aspects 1-13 further includes that the scanned SSB has an RSRP less than the threshold and the selected scanning bandwidth is a first scanning bandwidth, the method further includes ignoring cell-defining SSB information carried by a PBCH payload; changing the first scanning bandwidth to a second scanning bandwidth; re-scanning for the SSBs on the band with the selected second scanning bandwidth; determining whether the cell is detected again at the frequency F_c based on the scanned SSBs; and refraining from camping on the cell in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs.

[00116] In Aspect 15, the method of any of Aspects 1-14 further includes storing information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs, wherein additional scanning of SSBs on the band is based on the stored information.

[00117] In Aspect 16, the method of any of Aspects 1-15 further includes that the SSBs are scanned on the band based on historical information associated with ghost cell frequencies.

[00118] Aspect 17 is a device including one or more processors and one or more memories in electronic communication with the one or more processors storing instructions executable by the one or more processors to cause the system or apparatus to implement a method as in any of Aspects 1-16. [00119] Aspect 18 is a system or apparatus including means for implementing a method or realizing an apparatus as in any of Aspects 1-16.

[00120] Aspect 19 is a non-transitory computer readable medium storing instructions executable by one or more processors to cause the one or more processors to implement a method as in any of Aspects 1-16.

[00121] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but is to be accorded the full scope consistent with the language claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Terms such as “if,” “when,” and “while” should be interpreted to mean “under the condition that” rather than imply an immediate temporal relationship or reaction. That is, these phrases, e.g., “when,” do not imply an immediate action in response to or during the occurrence of an action, but simply imply that if a condition is met then an action will occur, but without requiring a specific or immediate time constraint for the action to occur. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof’ include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C. Specifically, combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof’ may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The words “module,” “mechanism,” “element,” “device,” and the like may not be a substitute for the word “means.” As such, no claim element is to be construed as a means plus function unless the element is expressly recited using the phrase “means for.”

Claims

CLAIMS WHAT IS CLAIMED IS:

1. A method of wireless communication at a user equipment (UE), comprising: selecting a scanning bandwidth for scanning for synchronization signal blocks (SSBs) from cells on a band based on at least one of a particular band or a bandwidth of the band; and scanning for the SSBs on the band with the selected scanning bandwidth.

2. The method of claim 1, wherein the SSBs are constrained to particular raster candidates within the band based on a raster candidate step size associated with a global synchronization raster channel (GSRC) constraint, wherein the selecting the scanning bandwidth comprises: determining an initial scanning bandwidth; determining whether the initial scanning bandwidth for the band corresponds to a receive (Rx) analog-to-digital converter (ADC) clock rate that is a multiple of the raster candidate step size; and increasing the scanning bandwidth to avalue that corresponds to anRx ADCclock rate that is not a multiple of candidate step size in response to the determination that the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size.

3. The method of claim 2, wherein the determining whether the initial scanning bandwidth for the band corresponds to anRx ADC clock rate that is a multiple of the raster candidate step size comprises: determining whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz.

4. The method of claim 3, wherein the scanning bandwidth is increased to 15 MHz.

5. The method of claim 2, wherein the determining whether the initial scanning bandwidth for the band corresponds to anRx ADC clock rate that is a multiple of the raster candidate step size comprises: determining whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz.

6. The method of claim 5, wherein the scanning bandwidth is increased to 40 MHz.

7. The method of claim 2, wherein the determining whether the initial scanning bandwidth for the band corresponds to anRx ADC clock rate that is a multiple of the raster candidate step size comprises: determining whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz.

8. The method of claim 7, wherein the scanning bandwidth is increased to 80 MHz.

9. The method of claim 1, wherein the selecting the scanning bandwidth comprises: determining whether the band corresponds to a band in a set of bands; and setting the scanning bandwidth such that a receive (Rx) analog-to-digital converter (ADC) clock rate corresponding to the scanning bandwidth is greater than the bandwidth.

10. The method of claim 9, wherein the set of bands comprises band n41, band n78, and band n79, and the scanning bandwidth is set to a minimum of 20 MHz for band n41 and to a minimum of 80 MHz for band n78 and band n79.

11. The method of claim 1, wherein the selecting the scanning bandwidth comprises: determining whether the band corresponds to a band in a set of bands; and setting the scanning bandwidth such that a receive (Rx) analog-to-digital converter (ADC) clock rate corresponding to the scanning bandwidth is maximized.

12. The method of claim 11, wherein the set of bands comprises band n77, and the scanning bandwidth is set to 100 MHz.

13. The method of claim 1, further comprising: detecting a cell at a frequency F_c based on the scanned SSBs; determining whether the scanned SSB has a reference signal received power (RSRP) greater than a threshold; and camping on the cell in response to the determination that the scanned SSB has an RSRP greater than the threshold.

14. The method of claim 13, wherein the scanned SSB has an RSRP less than the threshold and the selected scanning bandwidth is a first scanning bandwidth, the method further comprising: ignoring cell-defining SSB information carried by a physical broadcast channel (PBCH) payload; changing the first scanning bandwidth to a second scanning bandwidth; re-scanning for the SSBs on the band with the selected second scanning bandwidth; determining whether the cell is detected again at the frequency F_c based on the scanned SSBs; and refraining from camping on the cell in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs.

15. The method of claim 14, further comprising: storing information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs, wherein additional scanning of SSBs on the band is based on the stored information.

16. The method of claim 1, wherein the SSBs are scanned on the band based on historical information associated with ghost cell frequencies.

17. An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: select a scanning bandwidth for scanning for synchronization signal blocks (SSBs) from cells on a band based on at least one of a particular band or a bandwidth of the band; and scan for the SSBs on the band with the selected scanning bandwidth.

18. The apparatus of claim 17, wherein the SSBs are constrained to particular raster candidates within the band based on a raster candidate step size associated with a global synchronization raster channel (GSRC) constraint, wherein to select the scanning bandwidth the at least one processor is configured to: determine an initial scanning bandwidth; determine whether the initial scanning bandwidth for the band corresponds to a receive (Rx) analog-to-digital converter (ADC) clock rate that is a multiple of the raster candidate step size; and increase the scanning bandwidth to a value that corresponds to an Rx ADC clock rate that is not a multiple of candidate step size in response to the determination that the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size.

19. The apparatus of claim 18, wherein to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size, the at least one processor is configured to: determine whether the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n41 and the initial scanning bandwidth is 10 MHz.

20. The apparatus of claim 18, wherein to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size, the at least one processor is configured to: determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 15 MHz or 20 MHz.

21. The apparatus of claim 18, wherein to determine whether the initial scanning bandwidth for the band corresponds to an Rx ADC clock rate that is a multiple of the raster candidate step size, the at least one processor is configured to: determine whether the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz, wherein the scanning bandwidth is increased upon determining the band corresponds to band n77, band n78, or band n79 and the initial scanning bandwidth is 50 MHz or 60 MHz.

22. The apparatus of claim 17, wherein to select the scanning bandwidth the at least one processor is configured to: determine whether the band corresponds to a band in a set of bands; and set the scanning bandwidth such that a receive (Rx) analog-to-digital converter (ADC) clock rate corresponding to the scanning bandwidth is greater than the bandwidth.

23. The apparatus of claim 22, wherein the set of bands comprises band n41, band n78, and band n79, and the scanning bandwidth is set to a minimum of 20 MHz for band n41 and to a minimum of 80 MHz for band n78 and band n79.

24. The apparatus of claim 17, wherein to select the scanning bandwidth the at least one processor is configured to: determine whether the band corresponds to a band in a set of bands; and set the scanning bandwidth such that a receive (Rx) analog-to-digital converter (ADC) clock rate corresponding to the scanning bandwidth is maximized.

25. The apparatus of claim 17, the at least one processor further configured to: detect a cell at a frequency F_c based on the scanned SSBs; determine whether the scanned SSB has a reference signal received power (RSRP) greater than a threshold; and camp on the cell in response to the determination that the scanned SSB has an RSRP greater than the threshold.

26. The apparatus of claim 25, wherein the scanned SSB has an RSRP less than the threshold and the selected scanning bandwidth is a first scanning bandwidth, the at least one processor further configured to: ignore cell-defining SSB information carried by a physical broadcast channel (PBCH) payload; change the first scanning bandwidth to a second scanning bandwidth; re-scan for the SSBs on the band with the selected second scanning bandwidth; determine whether the cell is detected again at the frequency F_c based on the scanned SSBs; and refrain from camping on the cell in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs.

27. The apparatus of claim 26, the at least one processor further configured to: store information associated with the frequency F_c for avoiding future scanning for SSBs on the frequency F_c in response to the determination that the cell is undetected at the frequency F_c based on the re-scanned SSBs, wherein additional scanning of SSBs on the band is based on the stored information.

28. The apparatus of claim 17, wherein the SSBs are scanned on the band based on historical information associated with ghost cell frequencies.

29. An apparatus for wireless communication at a user equipment (UE), comprising: means for selecting a scanning bandwidth for scanning for synchronization signal blocks (SSBs) from cells on a band based on at least one of a particular band or a bandwidth of the band; and means for scanning for the SSBs on the band with the selected scanning bandwidth.

30. A computer-readable medium storing computer executable code, the code when executed by a processor cause the processor to: select a scanning bandwidth for scanning for synchronization signal blocks (SSBs) from cells on a band based on at least one of a particular band or a bandwidth of the band; and scan for the SSBs on the band with the selected scanning bandwidth.