Signaling of candidate positions of SSB blocks in a DRS window based on a wraparound scheme

Abstract

A user equipment (UE) (120) receives information (310) indicating a timing configuration for finding a candidate position of a synchronization signal block (SSB) in a reference signal (DRS) window, wherein the DRS window is located in an unlicensed millimeter wave (mmW) frequency band, and wherein the timing configuration provides repetition of the SSB in the DRS window based at least in part on a wraparound scheme (310); scans for the SSB according to the timing configuration (320); receives the SSB in the DRS window (330); determines the timing of a serving cell associated with a base station (BS) (110) based at least in part on the SSB (340); and communicates with the BS based on the timing (350).

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 992,663, filed on March 20, 2020, entitled “DISCOVERY REFERENCE SIGNALTRANSMISSION IN UNLICENSED BAND,” and U.S. Non-Provisional Patent Application No. 16 / 948,155, filed on September 4, 2020, entitled “DISCOVERY REFERENCE SIGNALTRANSMISSION IN UNLICENSED BAND,” which are hereby expressly incorporated herein by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for discovery reference signal (DRS) transmission in unlicensed bands.

[0005] background

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless communication network may include several base stations (BS) that can support communication of several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a user equipment (UE) may include receiving information indicating a timing configuration for a candidate location for a discovery reference signal (DRS) window, wherein the DRS window is located within an unlicensed millimeter wave (mmW) band, and wherein the timing configuration provides repetition of a synchronization signal block (SSB) within the DRS window based at least in part on a wraparound scheme; and scanning to find the SSB according to the timing configuration.

[0011] In some aspects, a wireless communication method performed by a base station may include: transmitting information indicating a timing configuration for a candidate location for a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and transmitting the SSB according to the timing configuration.

[0012] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive information indicating a timing configuration for a candidate location of a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and scan to find the SSB according to the timing configuration.

[0013] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit information indicating a timing configuration for a candidate location of a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and transmit the SSB according to the timing configuration.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to perform the following operations: receiving information indicating a timing configuration for a candidate location of a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and scanning to find the SSB according to the timing configuration.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to perform the following operations: transmitting information indicating a timing configuration for a candidate location of a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and transmitting the SSB according to the timing configuration.

[0016] In some aspects, an apparatus for wireless communications may include: a device for receiving information indicating a timing configuration for a candidate location for a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and a device for scanning to find the SSB according to the timing configuration.

[0017] In some aspects, an apparatus for wireless communication may include: a device for transmitting information indicating a timing configuration for a candidate location for a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; and a device for transmitting the SSB according to the timing configuration.

[0018] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying figures.

[0019] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0022] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0023] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0024] Figure 3 is a diagram illustrating an example of signaling associated with DRS transmission in an unlicensed band according to various aspects of the present disclosure.

[0025] Figure 4-7 is a diagram illustrating an example of a wraparound scheme for DRS transmission in an unlicensed band according to various aspects of the present disclosure.

[0026] Figure 8 is a diagram illustrating example processes performed by user equipment in accordance with various aspects of the present disclosure.

[0027] Fig. 9 is a diagram illustrating example processes performed by a base station in accordance with various aspects of the present disclosure.

[0028] Detailed Description

[0029] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is independently implemented or implemented in combination with any other aspect of the present disclosure. In some aspects, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0030] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0031] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0032] Figure 1 1 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, B node, gNB, 5G B node (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0033] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” may be used interchangeably herein.

[0034] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transport network.

[0035] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, or the like.

[0036] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. In some aspects, the macro BS may have a high transmit power level (e.g., 5 to 40 watts), while the pico BS, femto BS, and relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0037] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0038] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. UEs may be cellular phones (e.g., smart phones), personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, laptop computers, cordless phones, wireless local loop (WLL) stations, tablets, cameras, gaming devices, netbooks, smartbooks, ultrabooks, medical devices or equipment, biometric sensors / devices, wearable devices (smart watches, smart clothing, smart glasses, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets)), entertainment devices (e.g., music or video devices, or satellite radios), vehicle components or sensors, smart meters / sensors, industrial manufacturing equipment, global positioning system devices, or any other suitable device configured to communicate via wireless or wired media.

[0039] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. In some aspects, MTC and eMTC UEs include robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. In some aspects, a wireless node may provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that accommodates components of UE 120, such as a processor component, a memory component, etc. In some aspects, the processor component and the memory component may be coupled together. In some aspects, processor components (eg, one or more processors) and memory components (eg, memories) may be operatively coupled, communicatively coupled, electronically coupled, electrically coupled, and the like.

[0040] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0041] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. In some aspects, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0042] The devices of the wireless network 100 may communicate using an electromagnetic spectrum that may be subdivided into various categories, frequency bands, channels, etc. based on frequency or wavelength. For example, the devices of the wireless network 100 may communicate using an operating band having a first frequency range (FR1) and / or may communicate using an operating band having a second frequency range (FR2), the first frequency range (FR1) may span 410 MHz to 7.125 GHz, and the second frequency range (FR2) may span 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a "sub-6 GHz band". Similarly, FR2 is often referred to as a "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise specifically stated, it should be understood that the terms "sub-6 GHz" and the like, if used herein, may broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise specifically stated, it should be understood that the terms "millimeter wave" and the like, if used herein, may broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0043] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described herein. Figure 1 Examples described.

[0044] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 One for each base station and one for each UE in the base station 110. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0045] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0046] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0047] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 as well as other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0048] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the may perform one or more techniques associated with DRS transmission in an unlicensed band, as described in more detail elsewhere herein. In some aspects, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component(s) that may execute or direct Figure 8 The process of 800 Fig. 9 900, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. In some aspects, the one or more instructions, when executed (e.g., directly, or after compilation, conversion, interpretation, etc.) by one or more processors of base station 110 and / or UE 120, may execute or direct Figure 8 The process of 800 Fig. 9 The process 900 of , and / or operations of other processes as described herein. In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, interpreting instructions, etc. The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0049] In some aspects, UE 120 may include: means for receiving information indicating a timing configuration for discovering candidate locations for a reference signal (DRS) window, wherein the DRS window is within an unlicensed millimeter wave (mmW) frequency band, and wherein the timing configuration provides repetition of a synchronization signal block (SSB) within the DRS window based at least in part on a wraparound scheme; means for scanning for the SSB according to the timing configuration; means for receiving information indicating a quasi-co-located relationship between candidate locations for two or more of the multiple DRS windows, and the like. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0050] In some aspects, the base station 110 may include: means for transmitting information indicating a timing configuration for a candidate position of a DRS window, wherein the DRS window is located within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of an SSB within the DRS window based at least in part on a wraparound scheme; means for transmitting the SSB according to the timing configuration; means for transmitting information indicating a quasi-co-located relationship between candidate positions of two or more of the multiple DRS windows, and the like. In some aspects, such means may include in conjunction with Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0051] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described herein. Figure 2 Examples described.

[0052] In an unlicensed spectrum, a discovery reference signal (DRS) may be transmitted by a base station to facilitate discovery of the base station by other wireless communication devices (e.g., UEs, base stations, etc.). In some aspects, the DRS may include a synchronization signal / physical broadcast channel (SS / PBCH) block (SSB), or one or more of the signals containing the SSB (e.g., a primary synchronization signal, a secondary synchronization signal, a PBCH, or a combination thereof). The SSB may be associated with a quasi-co-located relationship, which may define a relationship between characteristics of the SSB and characteristics of one or more other signals or channels. Therefore, the characteristics of the SSB may be used to derive characteristics of one or more other signals or channels. In addition, the UE may determine the serving cell timing based on the detected SSB, as described below. The SSB (i.e., DRS) may be transmitted in a DRS window. The DRS window may have a configurable length, and when the length is not configured, the UE may assume a specific length. The DRS window may include multiple candidate locations in which the SSB may be transmitted. The number of candidate positions in the DRS window may be based at least in part on the subcarrier spacing of the base station transmitting the SSB.

[0053] Unlicensed spectrum may involve some uncertainty in the medium because there is no central scheduler for all devices in unlicensed spectrum. Therefore, a DRS window timing configuration in which SSBs are not repeated may not be suitable for unlicensed spectrum because the transmission of a given SSB may be interrupted or blocked due to medium uncertainty. In addition, signaling the timing configuration of the DRS window may involve overhead, particularly in higher frequency bands that may be associated with a larger number of candidate positions in the DRS window. In some aspects, the SSB index value may not be suitable for signaling the timing configuration of the DRS window in a DRS window associated with a larger number of candidate positions.

[0054] Some techniques and apparatus described herein provide signaling of a timing configuration of a DRS window based at least in part on a wraparound scheme. The wraparound scheme may provide repetition of an SSB at multiple candidate positions in the DRS window, thereby increasing the likelihood that the SSB is successfully transmitted. Aspects of the wraparound scheme are similar to Figure 4-7 In addition, the timing configuration may be signaled using parameters suitable for handling timing configurations associated with a large number of candidate locations, such as timing configurations associated with a millimeter wave (mmW) band, a 60 GHz band, and the like. Aspects of the parameters are similar to Figure 3 Describe in combination.

[0055] In this way, the reliability of communications over higher frequency unlicensed spectrum (e.g., mmW spectrum, 60 GHz spectrum, etc.) is improved. In addition, the use of parameters suitable for timing configurations indicating a large number of candidate locations (e.g., more than 64 candidate locations, etc.) can enable the use of timing configurations based on wraparound schemes in higher frequency unlicensed spectrum associated with smaller subcarrier spacing (e.g., 60 kHz, 120 kHz, etc.).

[0056] Figure 3 1 is a diagram illustrating an example 300 of signaling associated with DRS transmission in an unlicensed band according to various aspects of the present disclosure. As shown, the example 300 includes a UE 120 and a BS 110. As further shown, the UE 120 may be associated with a higher frequency band, such as a mmW band, a 60 GHz band, etc.

[0057] like Figure 3In and indicated by reference numeral 310, BS 110 may provide information indicating a timing configuration to UE 120. As further shown, the timing configuration may indicate a candidate position for a DRS window. In some aspects, the timing configuration may indicate one or more additional SSB positions. The timing configuration and / or the candidate positions may use repetition based at least in part on a wraparound scheme (e.g., an SSB may be repeated in two or more candidate positions). In some aspects, the timing configuration may indicate one or more additional SSB positions. Additional aspects of the wraparound scheme will be described in detail below. Figure 4-7 Describe in combination.

[0058] The DRS window may contain up to M SSB candidate positions. In some aspects, M may be more than 64. In some aspects, with a 120KHz subcarrier spacing, up to 80 candidate positions may be accommodated in a 5ms DRS window. In some frequency ranges (e.g., frequency range 1 or frequency range 2), the least significant bit (LSB) of the SSB index, the SSB subcarrier offset parameter (e.g., ssb-SubcarrierOffset), or a spare bit in the PBCH may be used to indicate the timing configuration. However, in higher frequency ranges (e.g., mmW, 60GHz, etc.), up to or more than 64 SSBs may be transmitted in the DRS window to improve SSB coverage. Therefore, the LSB of the SSB index and / or the SSB subcarrier offset parameter alone may not provide sufficient information to indicate the timing configuration.

[0059] In some aspects, a non-LSB of an SSB subcarrier offset parameter (e.g., in addition to or in lieu of an LSB), one or more spare bits in a physical downlink control channel (PDCCH) configuration of a PBCH (e.g., in addition to or in lieu of spare bits), etc. may be used to indicate a timing configuration. Thus, the capacity of candidate locations for timing configuration indications may be increased. In some aspects, the timing configuration may be based at least in part on an assumption that the SSB grid is aligned with the resource block (RB) grid, which may reduce the size of the SSB subcarrier offset parameter, thereby freeing up bits for indicating the timing configuration. In some aspects, the configuration of the PDCCH configuration may be extended so that multiple bits may be used for timing configuration indications.

[0060] The DRS window may support up to Y candidate positions, where Y is an integer. In some aspects, for 15kHz subcarrier spacing (SCS), Y may be 10 and for 30kHz SCS, Y may be 20. The UE may determine the serving cell timing based on the detected SSB candidate positions, where the SSB candidate positions within the DRS transmission window are indexed as 0,…,Y-1 (where Y=10 for 15kHz subcarrier spacing (SCS) and Y=20 for 30kHz SCS). For 15kHz or 30kHz SCS, the PBCH demodulation reference signal (DMRS) sequence index (for 3LSBs) and 1 or 2 of the 3 available bits in the PBCH payload in FR2 for the most significant bit (MSB) SSB index may be used (such as PBCH payload bits 10 for 15kHz SCS). and PBCH payload bits for 30kHz SCS and ) combination to detect the SSB position index within the DRS transmission window.

[0061] Among the Y candidate positions, multiple wraparound transmission opportunities may be provided for each SSB. In some aspects, an SSB may be associated with a quasi-co-located (QCL) relationship, and multiple transmission opportunities may be provided for an SSB with a given QCL parameter. For an SSB with a given QCL parameter, if a listen-before-talk (LBT) operation fails for the SSB, there may be another opportunity to transmit the SSB with the given QCL parameter again later in the same DRS window. The UE 120 is aware of the QCL relationship between the SSBs based at least in part on an indication of a factor referred to as Q. In some aspects, an SS / PBCH block index (also referred to as an SSB index) may be expressed as a modulo (PBCH DMRS sequence index, Q) or a modulo (candidate SS / PBCH block index, Q). The candidate SS / PBCH block index allows multiple candidate positions to be used for the same SSB index. For a given cell, the UE 120 may assume that the SS / PBCH blocks in the same candidate position within the DRS transmission window are quasi-co-located across the DRS transmission window. From the perspective of UE 120, the number of SSBs transmitted within the DRS window is no greater than Q. Q may be selected from the range {1, 2, 4, 8} and may be indicated by the MIB (for initial access) or dedicated radio resource control (RRC) signaling (for radio resource management (RRM)).

[0062] In some aspects, a parameter of a PBCH identifying Q may be used to indicate a timing indication. In some aspects, a UE 120 may receive RRC signaling or a system information block (e.g., a remaining minimum system information (RMSI) block, etc.) indicating Q. The UE 120 may also receive a PBCH including a parameter value defining Q, and may determine a timing indication based at least in part on the parameter value defining Q. In some aspects, a DMRS sequence may be used to indicate a timing indication. In some aspects, the UE 120 may use a PBCH DMRS sequence that carries information indicating a timing configuration. In some aspects, a PBCH DMRS sequence may be increased relative to a baseline size to carry information indicating a timing configuration. In some aspects, a PBCH DMRS sequence may be generated using a timing configuration as an input, or may be generated using a sequence indicating a timing configuration.

[0063] As shown by reference numeral 320, UE 120 may scan for SSBs according to the timing configuration. In some aspects, as shown by reference numeral 330, UE 120 may receive the SSB at a particular candidate position in the DRS window. As shown by reference numeral 340, UE 120 may determine the timing of a serving cell associated with BS 110 based at least in part on the SSB. As shown by reference numeral 350, UE 120 may communicate with BS 110 according to the timing. Thus, UE 120 may synchronize with BS 110 based at least in part on the SSBs transmitted according to the wraparound scheme. The timing configuration of the wraparound scheme may be signaled using one or more parameters applicable to a large number of candidate positions (e.g., more than 64 candidate positions), thereby enabling the wraparound scheme to be used in higher frequency bands.

[0064] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described herein. Figure 3 Examples described.

[0065] Figure 4-7 are diagrams illustrating examples 400 , 500 , 600 , and 700 of wraparound schemes for DRS transmission in an unlicensed band in accordance with various aspects of the present disclosure. Figure 4-7 Aspects of candidate positions in one or more DRS windows are shown. Figure 4, in some aspects, the candidate positions are illustrated by reference numeral 410. Candidate positions illustrated with a particular fill are associated with a particular QCL relationship. In some aspects, candidate positions 0 and 64, shown by reference numerals 420 and 430, are associated with the same QCL relationship because both candidate positions 0 and 64 are illustrated with a white fill. Thus, the SSB transmitted at candidate position 64 is a repetition of the SSB transmitted at candidate position 0 because the candidate positions are illustrated with the same fill. The top row of each of examples 400, 500, 600, and 700 illustrates a planned set of candidate positions, while the following rows illustrate the configuration of the transmitted SSBs. For example, a base station may not transmit at all planned candidate positions for various reasons, such as failure to secure the medium, etc.

[0066] Reference numerals 440, 450, and 460 show candidate positions for SSB in different transmissions. In example 400, there are more than 64 possible SSB positions (e.g., M>64). In this case, the wrap mode indicates that a set of 64 candidate positions is used, and the candidate positions wrap around every 64 positions. Therefore, in the transmission shown in reference numeral 450, candidate positions 64 and 65 have the same QCL relationship as candidate positions 0 and 1 in the transmission shown in reference numeral 440, respectively. In this way, if the medium is not available at the beginning of the DRS window corresponding to candidate positions 0 and 1, the base station may perform the transmission shown by reference numeral 440 or reference numeral 450, thereby enabling the UE to receive the SSB and synchronize with the base station.

[0067] exist Figure 5In the example 500, the first SSB set is transmitted and the remaining candidates are used for additional SSB opportunities. In some aspects, up to 64 candidate SSB positions may be allowed for each DRS transmission. Among the 64 candidate SSB positions, up to M SSBs may be transmitted, and the remaining 64-M positions may be used for other SSB opportunities. In example 500, M=16. Therefore, in the first DRS window and the second DRS window, each transmission 510, 520 and 530 includes 16 SSBs in each DRS window. In addition, as shown by reference numeral 540, the candidate positions in different DRS windows may correspond to different beams (e.g., different QCL relationships). In some aspects, the first DRS window may transmit the first 16 SSB beams, the second DRS window may transmit the second 16 SSB beams, and so on. On each DRS window, the dimensions of up to 4 wraparound candidate position sets (e.g., 64) may be determined without additional PBCH signaling changes. Thus, by using up to 64 candidate positions, the PBCH does not need to be updated, while providing a wraparound scheme to improve the reliability of SSB signaling in unlicensed media. For comparison, see example 400, where more than 64 positions are defined and wraparound is performed across the 64 positions.

[0068] In example 500, Q may indicate QCL information for each DRS transmission. In some aspects, in example 500, Q may indicate that there are 16 beams in each DRS transmission. In some aspects, every second DRS transmission (or every Xth DRS transmission, where X is an integer) has the same QCL relationship at the corresponding SSB position. This signaling may be provided via RRC signaling (e.g., RMSI or dedicated RRC signaling).

[0069] Figure 6 The example 600 shown in is an example in which the DRS window 610 is divided into segments 620 and 630. Segments 620 or 630 may be defined relative to a half-frame length, such as K*(half-frame). In some aspects, K is an integer and a half-frame is 5ms. For DRS transmission, each SSB beam may have up to N candidate positions. The candidate SSB positions for each SSB beam are separated by at least one K*(half-frame) segment. In some aspects, the candidate position shown by reference numeral 640 is separated from candidate position 650 by one segment. In each segment, up to 64 candidate SSB positions may be used. If the base station can only secure the medium after candidate positions 0 and 1, such as in transmission 660, the base station may transmit the SSB in candidate positions 0 and 1 in segment 630. Alternatively, as Figure 7As shown in example 700, if the base station fails to secure the medium for any one or more candidate positions in segment 710, the base station may only transmit the SSB in segment 720. In other words, the base station may jump to the next segment based at least in part on the failure to secure the medium during any one or more candidate positions in segment 710. In some aspects, for a given K* (half-frame) segment, the base station may only be allowed to transmit to up to S SSB beams. All SSB beams to be transmitted by the base station may be transmitted in a given K* half-frame segment. Examples 600 and 700 may be associated with lower latency than systems (such as example 500) in which candidate positions are repeated across DRS windows.

[0070] As indicated above, Figure 4-7 is provided as one or more examples. Other examples may differ from the Figure 4-7 Examples described.

[0071] Figure 8 is a diagram illustrating an example process 800 performed in some aspects by a UE in accordance with various aspects of the present disclosure. Example process 800 shows that a UE (eg, UE 120, etc.) performs operations associated with discovery reference signal transmission in an unlicensed band.

[0072] like Figure 8 As shown in , in some aspects, process 800 may include receiving information indicating a timing configuration for a candidate location for a discovery reference signal (DRS) window, wherein the DRS window is within an unlicensed millimeter wave (mmW) frequency band, and wherein the timing configuration provides repetition of synchronization signal blocks (SSBs) within the DRS window based at least in part on a wraparound scheme (block 810). In some aspects, a UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may receive information indicating a timing configuration for a candidate location for a discovery reference signal (DRS) window. In some aspects, the DRS window is within an unlicensed millimeter wave (mmW) frequency band. In some aspects, the timing configuration provides repetition of synchronization signal blocks (SSBs) within the DRS window based at least in part on a wraparound scheme.

[0073] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include scanning for the SSB according to the timing configuration (block 820). In some aspects, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, etc.) may scan for the SSB according to the timing configuration, as described above.

[0074] Process 800 may include additional aspects, such as any single implementation or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0075] In a first aspect, the information indicating the timing configuration includes: non-least significant bits of an SSB subcarrier offset parameter, one or more bits of a control channel configuration parameter, one or more bits of an extension of a control channel configuration parameter, or a combination thereof.

[0076] In a second aspect, alone or in combination with the first aspect, the information indicating the timing configuration is indicated by an SSB quasi-co-location relationship parameter of the PBCH, and wherein the method further includes receiving radio resource control signaling indicating the SSB quasi-co-location relationship parameter for the DRS window separately from the SSB quasi-co-location relationship parameter.

[0077] In a third aspect, alone or in combination with any one or more of the first and second aspects, the information indicating the timing configuration is indicated by a PBCH demodulation reference signal (DMRS) sequence.

[0078] In a fourth aspect, either alone or in combination with any one or more of the first to third aspects, the repetition of the SSB occurs once every M candidate positions, and wherein there are more than M candidate positions in the DRS window.

[0079] In a fifth aspect, alone or in combination with any one or more of the first to fourth aspects, the set of SSBs transmitted in the DRS window is located at a candidate position subsequent to the earliest candidate position starting from the DRS window.

[0080] In a sixth aspect, either alone or in combination with any one or more of the first to fifth aspects, the DRS window is a first DRS window among multiple DRS windows, and wherein a corresponding SSB subset of an SSB set of DRS transmissions is transmitted in the multiple DRS windows, and wherein the wraparound scheme indicates wraparound candidate positions in the multiple DRS windows.

[0081] In a seventh aspect, either alone or in combination with any one or more of the first to sixth aspects, the same candidate position in two different ones of the plurality of DRS windows corresponds to different beams used to transmit corresponding SSBs in the SSB set.

[0082] In an eighth aspect, alone or in combination with any one or more of the first to seventh aspects, the SSB quasi-co-location relation parameter indicates quasi-co-location information about an SSB subset in the corresponding SSB subset.

[0083] In a ninth aspect, either alone or in combination with any one or more of the first to eighth aspects, process 800 includes receiving information indicating a quasi-co-located relationship between candidate positions of two or more of the plurality of DRS windows.

[0084] In a tenth aspect, alone or in combination with any one or more of the first to ninth aspects, the information indicating the quasi co-located relationship is received using radio resource control signaling.

[0085] In an eleventh aspect, either alone or in combination with any one or more of the first to tenth aspects, the DRS window is divided into a plurality of segments, wherein the SSB is associated with two or more candidate positions, and wherein the two or more candidate positions are located in corresponding segments among the plurality of segments.

[0086] In a twelfth aspect, alone or in combination with any one or more of the first to eleventh aspects, up to 64 candidate positions are included in each segment of the plurality of segments.

[0087] In a thirteenth aspect, either alone or in combination with any one or more of the first to twelfth aspects, all SSBs in the plurality of SSBs to be transmitted in the DRS window are included in one segment in the plurality of segments.

[0088] In a fourteenth aspect, alone or in combination with any one or more of the first to thirteenth aspects, the plurality of segments are defined relative to a half-frame length of the UE.

[0089] although Figure 8 An example block diagram of process 800 is shown, but in some aspects, process 800 may include Figure 8 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 800. Additionally or alternatively, two or more blocks of process 800 may be executed in parallel.

[0090] Fig. 9 is a diagram illustrating an example process 900 performed in some aspects by a base station in accordance with various aspects of the present disclosure. Example process 900 shows that a base station (eg, BS 110, etc.) performs operations associated with discovery reference signaling in an unlicensed band.

[0091] like Fig. 9As shown in , in some aspects, process 900 may include transmitting information indicating a timing configuration for a candidate position of a DRS window, wherein the DRS window is within an unlicensed mmW frequency band, and wherein the timing configuration provides repetition of SSBs within the DRS window based at least in part on a wraparound scheme (block 910). In some aspects, a base station (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit information indicating a timing configuration for a candidate position of a DRS window. In some aspects, the DRS window is within an unlicensed mmW frequency band. In some aspects, the timing configuration provides repetition of SSBs within the DRS window based at least in part on a wraparound scheme.

[0092] like Fig. 9 As further shown in FIG. 9 , in some aspects, process 900 may include transmitting the SSB according to the timing configuration (block 920). In some aspects, the base station (e.g., using controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, etc.) may transmit the SSB according to the timing configuration, as described above.

[0093] Process 900 may include additional aspects, such as any single implementation or any combination of aspects described below or in combination with one or more other processes described elsewhere herein.

[0094] In a first aspect, the information indicating the timing configuration includes: non-least significant bits of an SSB subcarrier offset parameter, one or more bits of a control channel configuration parameter, one or more bits of an extension of a control channel configuration parameter, or a combination thereof.

[0095] In a second aspect, alone or in combination with the first aspect, the information indicating the timing configuration is indicated by an SSB quasi-co-location relation parameter of the PBCH, and wherein the method further includes transmitting radio resource control signaling indicating the SSB quasi-co-location relation parameter for the DRS window separately from the SSB quasi-co-location relation parameter.

[0096] In a third aspect, alone or in combination with any one or more of the first and second aspects, the information indicating the timing configuration is indicated by a PBCH demodulation reference signal (DMRS) sequence.

[0097] In a fourth aspect, either alone or in combination with any one or more of the first to third aspects, the repetition of the SSB occurs once every M candidate positions, and wherein there are more than M candidate positions in the DRS window.

[0098] In a fifth aspect, alone or in combination with any one or more of the first to fourth aspects, the set of SSBs transmitted in the DRS window is located at a candidate position subsequent to the earliest candidate position starting from the DRS window.

[0099] In a sixth aspect, either alone or in combination with any one or more of the first to fifth aspects, the DRS window is a first DRS window among multiple DRS windows, and a corresponding SSB subset in an SSB set of DRS transmission is transmitted in the multiple DRS windows, and the wraparound scheme indicates a wraparound candidate position in the multiple DRS windows.

[0100] In a seventh aspect, either alone or in combination with any one or more of the first to sixth aspects, the same candidate position in two different ones of the plurality of DRS windows corresponds to different beams used to transmit corresponding SSBs in the SSB set.

[0101] In an eighth aspect, alone or in combination with any one or more of the first to seventh aspects, the SSB quasi-co-location relation parameter indicates quasi-co-location information about an SSB subset in the corresponding SSB subset.

[0102] In a ninth aspect, either alone or in combination with any one or more of the first to eighth aspects, process 900 includes transmitting information indicating a quasi-co-located relationship between candidate positions of two or more of the plurality of DRS windows.

[0103] In a tenth aspect, alone or in combination with any one or more of the first to ninth aspects, the information indicating the quasi co-located relationship is transmitted using radio resource control signaling.

[0104] In an eleventh aspect, either alone or in combination with any one or more of the first to tenth aspects, the DRS window is divided into a plurality of segments, wherein the SSB is associated with two or more candidate positions, and wherein the two or more candidate positions are located in corresponding segments among the plurality of segments.

[0105] In a twelfth aspect, alone or in combination with any one or more of the first to eleventh aspects, up to 64 candidate positions are included in each segment of the plurality of segments.

[0106] In a thirteenth aspect, either alone or in combination with any one or more of the first to twelfth aspects, all SSBs in the plurality of SSBs to be transmitted in the DRS window are included in one segment in the plurality of segments.

[0107] In a fourteenth aspect, alone or in combination with any one or more of the first to thirteenth aspects, the plurality of segments are defined relative to a half-frame length of the UE.

[0108] although Fig. 9 An example block diagram of process 900 is shown, but in some aspects, process 900 may include Fig. 9 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 900. Additionally or alternatively, two or more blocks of process 900 may be executed in parallel.

[0109] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0110] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0111] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0112] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes-it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0113] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically described in the claims and / or undisclosed in the specification. Although each of the dependent claims listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase "at least one" quoted in a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc, and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0114] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: receiving information indicating one or more synchronization signal block (SSB) candidate locations for a discovery reference signal (DRS) window based at least in part on a wraparound scheme, wherein the DRS window is located in an unlicensed millimeter wave (mmW) frequency band, wherein the SSB index within the DRS window is determined based at least in part on a subcarrier spacing and a single bit in a payload, wherein the quasi co-location of SSBs within the DRS window is based at least in part on the wraparound scheme, wherein the quasi co-location of the SSB within the DRS window is based at least in part on a value, and wherein one or more repetitions of the SSB occur once for every M SSB candidate positions; as well as scanning for at least one of the SSBs based on the information, The number of SSBs transmitted within the DRS window is no greater than the value.

2. The method of claim 1, wherein the information comprises: The non-least significant bits of the SSB subcarrier offset parameter, One or more bits of a control channel configuration parameter, one or more bits of an extension of the control channel configuration parameter, or Its combination.

3. The method of claim 1, wherein the information is indicated by a SSB quasi-co-location relation parameter of a physical broadcast channel (PBCH).

4. The method of claim 1, wherein the information is indicated by a physical broadcast channel (PBCH) demodulation reference signal (DMRS) sequence. The method of claim 1 , wherein the DRS window includes more than M candidate positions.

6. The method of claim 1, wherein the SSB transmitted in the DRS window is located at a candidate position subsequent to an earliest candidate position starting from the DRS window.

7. The method of claim 1, wherein the DRS window is a first DRS window among a plurality of DRS windows, and wherein a corresponding subset of SSBs in a set of SSBs transmitted by the DRS is transmitted in the plurality of DRS windows, and The wrapping scheme indicates wrapping candidate positions in the plurality of DRS windows.

8. The method of claim 7, wherein the same candidate position in two different DRS windows of the plurality of DRS windows corresponds to different beams used to transmit corresponding SSBs in the SSB set.

9. The method of claim 7, wherein the SSB quasi-co-location relation parameter indicates quasi-co-location information about an SSB subset in the corresponding SSB subset.

10. The method of claim 7, wherein the method further comprises: Information indicating a quasi-co-located relationship between candidate locations of two or more of the plurality of DRS windows is received.

11. The method of claim 10, wherein the information indicative of the quasi co-located relationship is received using radio resource control signaling.

12. The method of claim 1, wherein the DRS window is divided into a plurality of segments, wherein the SSB is associated with two or more candidate locations, and The two or more candidate positions are located in corresponding segments among the plurality of segments.

13. The method of claim 12, wherein up to 64 candidate positions are included in each of the plurality of segments.

14. The method of claim 12, wherein all of the plurality of SSBs to be transmitted in the DRS window are included in one segment of the plurality of segments.

15. The method of claim 12, wherein the plurality of segments are defined relative to a half-frame length of the UE.

16. A user equipment (UE) for wireless communication, comprising: one or more memories; as well as One or more processors coupled to the one or more memories, individually or collectively configured to: receiving information indicating one or more synchronization signal block (SSB) candidate locations for a discovery reference signal (DRS) window based at least in part on a wraparound scheme, wherein the DRS window is located in an unlicensed millimeter wave (mmW) frequency band, wherein the SSB index within the DRS window is determined based at least in part on a subcarrier spacing and a single bit in a payload, wherein the quasi co-location of SSBs within the DRS window is based at least in part on the wraparound scheme, wherein the quasi co-location of the SSB within the DRS window is based at least in part on a value, and wherein one or more repetitions of the SSB occur once for every M SSB candidate positions; as well as scanning for at least one of the SSBs based on the information, The number of SSBs transmitted within the DRS window is no greater than the value.

17. The UE according to claim 16, wherein the information comprises: The non-least significant bits of the SSB subcarrier offset parameter, One or more bits of a control channel configuration parameter, one or more bits of an extension of the control channel configuration parameter, or Its combination.

18. The UE of claim 16, wherein the information is indicated by an SSB quasi-co-location relation parameter of a physical broadcast channel (PBCH).

19. The UE of claim 16, wherein the information is indicated by a physical broadcast channel (PBCH) demodulation reference signal (DMRS) sequence.

20. The UE of claim 16, wherein the DRS window includes more than M candidate positions.

21. The UE of claim 16, wherein the SSB transmitted in the DRS window is located at a candidate position subsequent to an earliest candidate position starting from the DRS window.

22. The UE of claim 16, wherein the DRS window is a first DRS window among a plurality of DRS windows, and wherein a corresponding subset of SSBs in a set of SSBs transmitted by the DRS is transmitted in the plurality of DRS windows, and The wrapping scheme indicates wrapping candidate positions in the plurality of DRS windows.

23. The UE of claim 16, wherein the DRS window is divided into a plurality of segments, wherein the SSB is associated with two or more candidate positions, and wherein the two or more candidate positions are located in corresponding segments of the plurality of segments.

24. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: receiving information indicating one or more synchronization signal block (SSB) candidate locations for a discovery reference signal (DRS) window based at least in part on a wraparound scheme, wherein the DRS window is located in an unlicensed millimeter wave (mmW) frequency band, wherein the SSB index within the DRS window is determined based at least in part on a subcarrier spacing and a single bit in a payload, wherein the quasi co-location of SSBs within the DRS window is based at least in part on the wraparound scheme, wherein the quasi co-location of the SSB within the DRS window is based at least in part on a value, and wherein one or more repetitions of the SSB occur once for every M SSB candidate positions; as well as scanning for at least one of the SSBs based on the information, The number of SSBs transmitted within the DRS window is no greater than the value.

25. The non-transitory computer readable medium of claim 24, wherein the information comprises: The non-least significant bits of the SSB subcarrier offset parameter, One or more bits of a control channel configuration parameter, one or more bits of an extension of the control channel configuration parameter, or Its combination.

26. The non-transitory computer readable medium of claim 24, wherein the information is indicated by an SSB quasi co-location relation parameter of a physical broadcast channel (PBCH).

27. A device for wireless communication, comprising: means for receiving information indicating one or more synchronization signal block (SSB) candidate locations for a discovery reference signal (DRS) window based at least in part on a wraparound scheme, wherein the DRS window is located in an unlicensed millimeter wave (mmW) frequency band, wherein the SSB index within the DRS window is determined based at least in part on a subcarrier spacing and a single bit in a payload, wherein the quasi co-location of SSBs within the DRS window is based at least in part on the wraparound scheme, wherein the quasi co-location of the SSB within the DRS window is based at least in part on a value, and wherein one or more repetitions of the SSB occur once for every M SSB candidate positions; as well as means for scanning for at least one of said SSBs based on said information, The number of SSBs transmitted within the DRS window is no greater than the value.

28. The apparatus of claim 27, wherein the information comprises: The non-least significant bits of the SSB subcarrier offset parameter, One or more bits of a control channel configuration parameter, one or more bits of an extension of the control channel configuration parameter, or Its combination.

29. The apparatus of claim 27, wherein the information is indicated by an SSB quasi-co-location relation parameter of a physical broadcast channel (PBCH).

30. The apparatus of claim 27, wherein the information is indicated by a physical broadcast channel (PBCH) demodulation reference signal (DMRS) sequence.

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