Synchronous signal block index scheme

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may detect a discovery reference signal (DRS) within a DRS transmission window that includes more than 64 candidate SSB locations; determine an index value for the SSB based at least in part on an indexing scheme for the SSB included in the DRS transmission window, wherein the indexing scheme includes one of a consecutive indexing scheme or a non-consecutive indexing scheme; and determine cell timing based at least in part on the index value. Numerous other aspects are described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 978,656, filed on February 19, 2020, entitled “SYNCHRONIZATION SIGNAL BLOCK INDEXING SCHEMES,” and U.S. Non-Provisional Patent Application No. 17 / 153,474, filed on January 20, 2021, entitled “SYNCHRONIZATION SIGNAL BLOCK INDEXING SCHEMES,” 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 synchronization signal block indexing schemes.

[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 (BSs) that can support communication for several user equipments (UEs). The UE may communicate with the BS via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, the BS may be referred to as a Node B, a gNB, an Access Point (AP), a Radio Head, a Transmit Receiving 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 a common protocol that enables different user equipment to communicate at the city, country, region, and even global level. NR (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by 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 detecting a discovery reference signal (DRS) within a synchronization signal block (SSB) transmission window that includes more than 64 candidate SSB locations; determining an index value of the SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and determining cell timing based at least in part on the index value.

[0011] In some aspects, a wireless communication method performed by a base station may include: determining an index value of an SSB included in a DRS transmission window that includes more than 64 candidate SSB positions based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and transmitting the SSB and an indication of the index value in the candidate SSB positions of the DRS transmission window.

[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: detect an SSB within a DRS transmission window including more than 64 candidate SSB positions; determine an index value of the SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme includes one of the following: a consecutive indexing scheme, wherein all SSBs are consecutively indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and determine cell timing based at least in part on the index value.

[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: determine an index value of an SSB included in a DRS transmission window including more than 64 candidate SSB positions based at least in part on an indexing scheme for SSBs included in the DRS transmission window, wherein the indexing scheme includes one of the following: a consecutive indexing scheme, wherein all SSBs are consecutively indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and transmit the SSB and an indication of the index value in the candidate SSB position of the DRS transmission window.

[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 the UE, may cause the one or more processors to: detect an SSB within a DRS transmission window including more than 64 candidate SSB positions; determine an index value of the SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme comprises one of: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and determine the cellular cell timing based at least in part on the index value.

[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: determine index values ​​of SSBs included in a DRS transmission window that includes more than 64 candidate SSB positions based at least in part on an indexing scheme for SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and transmit the SSB and an indication of the index value in the candidate SSB positions of the DRS transmission window.

[0016] In some aspects, an apparatus for wireless communication may include: a device for detecting an SSB within a DRS transmission window that includes more than 64 candidate SSB positions; a device for determining an index value of an SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and a device for determining cellular cell timing based at least in part on the index value.

[0017] In some aspects, an apparatus for wireless communications may include: a device for determining index values ​​of SSBs included in a DRS transmission window that includes more than 64 candidate SSB positions based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme in which all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme in which a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and a device for transmitting the SSBs and an indication of the index values ​​in the candidate SSB positions of the DRS transmission window.

[0018] Aspects generally include methods, apparatus, 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 and specification.

[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 or in the same drawing may identify the same or similar elements.

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

[0023] Figure 2 is a block diagram 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 a synchronization signal (SS) hierarchy in accordance with various aspects of the present disclosure.

[0025] Figure 4 is a diagram illustrating examples of candidate synchronization signal block (SSB) locations in an unlicensed radio frequency spectrum band in accordance with various aspects of the present disclosure.

[0026] Figure 5 is a diagram illustrating an example of SSB locations in a licensed RF spectrum band with 120 kHz subcarrier spacing in accordance with various aspects of the present disclosure.

[0027] Figure 6 is a diagram illustrating an example of SSB locations in a licensed RF spectrum band with 240 kHz subcarrier spacing in accordance with various aspects of the present disclosure.

[0028] Figure 7-11 is a diagram illustrating an example of a synchronization signal block indexing scheme according to various aspects of the present disclosure.

[0029] Fig.12 is a diagram illustrating an example process, performed, for example, by user equipment, in accordance with various aspects of the present disclosure.

[0030] Fig.13 is a diagram illustrating example processes performed, for example, by a base station in accordance with various aspects of the present disclosure.

[0031] Detailed Description

[0032] 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 implemented independently or in combination with any other aspect of the present disclosure. For example, 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.

[0033] 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.

[0034] 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.

[0035] 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 a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0036] 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 1In the example shown in , 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. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0037] 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, and / or the like using any suitable transport network.

[0038] 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.

[0039] 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 effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0040] 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.

[0041] 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. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0042] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. 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, for example, 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 houses components of UE 120, such as a processor component, a memory component, etc. In some aspects, a processor component and a memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operationally coupled, communicatively coupled, electronically coupled, electrically coupled, etc.

[0043] 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.

[0044] 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. For example, 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.

[0045] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 UE 120 may perform one or more techniques associated with the synchronization signal block indexing scheme, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Fig.12 The process 1200 Fig.13 1300, 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. For example, 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 perform or direct, for example, Fig.12 The process 1200 Fig.13 The process 1300 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.

[0051] In some aspects, UE 120 may include: a device for detecting a discovery reference signal (DRS) within a discovery reference signal (DRS) transmission window that includes more than 64 candidate synchronization signal block (SSB) locations; a device for determining an index value of an SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme, wherein all SSBs are consecutively indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; a device for determining cell timing based at least in part on the index value, and so on. In some aspects, such a device may include a method for combining 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.

[0052] In some aspects, the base station 110 may include: means for determining index values ​​for SSBs included in a DRS transmission window including more than 64 candidate SSB positions based at least in part on an indexing scheme for SSBs included in the DRS transmission window, wherein the indexing scheme includes one of: a consecutive indexing scheme in which all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme in which a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; means for transmitting an SSB and an indication of an index value in a candidate SSB position in the DRS transmission window, and the like. In some aspects, such means may include a combination of 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.

[0053] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0054] Figure 3 is a diagram illustrating an example 300 of a synchronization signal (SS) hierarchy in accordance with various aspects of the present disclosure. Figure 3As shown, the SS hierarchy may include an SS burst set 305 (e.g., SS burst sets 305a, 305b, etc.), which may include a plurality of SS bursts 310 (e.g., SS bursts 310a, 310b, 310c, etc.), shown as SS burst 0 through SS burst N-1, where N is the maximum number of repetitions of the SS burst 310 that may be transmitted by the base station. As further shown, each SS burst 310 may include one or more SS blocks (SSBs) 315 (e.g., SSBs 315a, 315b, 315c, 315x, 315y, 315z, etc.), shown as SSB 0 through SSB M-1, where M is the maximum number of SSBs 315 that may be carried by the SS burst 310. In some aspects, different SSBs 315 may be beamformed differently (e.g., transmitted using different beams) and may be used for beam management, beam selection, etc. (e.g., as part of an initial network access procedure). SS burst set 305 may be transmitted by a wireless node (eg, base station 110) periodically, such as every X milliseconds. Figure 3 In some aspects, the SS burst set 305 may have a fixed or dynamic length. Figure 3 In some cases, the SS burst set 305 or the SS burst 310 may be referred to as a discovery reference signal (DRS) transmission window, an SSB measurement time configuration (SMTC) window, or the like.

[0055] In some aspects, the SSB 315 may include resources that carry a primary synchronization signal (PSS) 320 (e.g., PSS 320a, 320b, etc.), a secondary synchronization signal (SSS) 325 (e.g., SSS 325a, 325b, etc.), a physical broadcast channel (PBCH) 330 (e.g., PBCH 330a, 330b, etc.), etc. In some aspects, multiple SSBs 315 are included in the SS burst 310 (e.g., transmissions on different beams), and the PSS 320, SSS 325, and / or PBCH 330 may be the same across each SSB 315 of the SS burst 310. In some aspects, a single SSB 315 may be included in the SS burst 310. In some aspects, the SSB 315 may be at least four symbols (e.g., OFDM symbols) in length, with each symbol carrying one or more of the PSS 320 (e.g., occupying one symbol), the SSS 325 (e.g., occupying one symbol), and / or the PBCH 330 (e.g., occupying two symbols). In some aspects, the SSB 315 may be referred to as an SS / PBCH block.

[0056] In some aspects, the symbols of SSB 315 are consecutive, such as Figure 3. In some aspects, the symbols of the SSB 315 are non-consecutive. Similarly, in some aspects, one or more SSBs 315 of the SS burst 310 may be transmitted in contiguous radio resources (e.g., contiguous symbols) during one or more time slots. Additionally or alternatively, one or more SSBs 315 of the SS burst 310 may be transmitted in non-consecutive radio resources.

[0057] In some aspects, the SS burst 310 may have a burst periodicity, and the SSBs 315 of the SS burst 310 may be transmitted by a wireless node (e.g., base station 110) according to the burst periodicity. In this case, the SSBs 315 may be repeated during each SS burst 310. In some aspects, the SS burst set 305 may have a burst set periodicity, whereby each SS burst 310 of the SS burst set 305 is transmitted by the wireless node according to a fixed burst set periodicity. In other words, the SS burst 310 may be repeated during each SS burst set 305.

[0058] In some aspects, the SSB 315 may include an SSB index, which may correspond to a beam for carrying the SSB 315. The UE 120 may monitor and / or measure the SSB 315 using different receive (Rx) beams during an initial network access procedure. Based at least in part on the monitoring and / or measurement, the UE 120 may indicate to the base station 110 one or more SSBs 315 having the best signal parameters (e.g., reference signal received power (RSRP) parameters, etc.). The base station 110 and the UE 120 may use the indicated one or more SSBs 315 to select one or more beams for communication between the base station 110 and the UE 120 (e.g., for random access channel (RACH) procedures, etc.). Additionally or alternatively, the UE 120 may use the SSB 315 and / or the SSB index to determine the cell timing of a cell (e.g., a serving cell) via which the SSB 315 is received, as described in more detail below.

[0059] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described in Figure 3 Examples described.

[0060] Figure 4 is a diagram illustrating an example 400 of candidate SSB locations in an unlicensed radio frequency spectrum band in accordance with various aspects of the present disclosure. An unlicensed radio frequency spectrum band may be referred to herein as an unlicensed band and may include bands reserved for shared or unlicensed use, bands reserved for licensed use but operating in an unlicensed mode of operation, and the like.

[0061] As an example, an unlicensed spectrum band may include one or more radio frequencies (e.g., one or more radio frequency spectrum bands) contained in a radio spectrum (e.g., a portion of the electromagnetic spectrum corresponding to radio frequencies, or frequencies below about 300 gigahertz (GHz)). In some aspects, an unlicensed frequency band may include one or more frequency bands that are open for shared use by any device that complies with the rules of a regulatory agency (e.g., associated with a particular country) to communicate via the one or more frequency bands. For example, an unlicensed frequency band may include one or more radio frequencies between approximately 5 GHz and approximately 6 GHz. As a more specific example, an unlicensed frequency band may include one or more radio frequencies between approximately 5.15 GHz and approximately 5.825 GHz.

[0062] As another example, the unlicensed bands may include one or more bands defined by the Federal Communications Commission (FCC) as unlicensed national information infrastructure (U-NII) radio bands. The U-NII radio bands may include, for example, a first band between about 5.15 GHz and about 5.25 GHz (e.g., U-NII low band), a second band between about 5.25 GHz and about 5.35 GHz (e.g., U-NII mid band), a third band between about 5.47 GHz and about 5.725 GHz (e.g., U-NII global band), and / or a fourth band between about 5.725 GHz and about 5.825 GHz (e.g., U-NII upper band).

[0063] A device (e.g., UE 120, base station 110, etc.) operating in an unlicensed band may contend for access to the unlicensed band (e.g., by performing a listen-before-talk (LBT) procedure) before obtaining access to the unlicensed band and / or communicating on the unlicensed band. The LBT procedure may include performing a clear channel assessment (CCA) procedure to determine whether a channel of the unlicensed band is available. When the device determines that a channel of the unlicensed band is not available (e.g., because another device is already using the channel), the CCA procedure may be performed again on the channel later. The CCA procedure may include detecting an energy level on a channel of the unlicensed band and determining whether the energy level meets a threshold. When the energy level does not meet (e.g., is less than, or is less than or equal to) the threshold, the CCA procedure is successful and contention for accessing the unlicensed band channel may be successful. When the energy level meets (e.g., is greater than, or is greater than or equal to) the threshold, the CCA procedure is unsuccessful and contention for accessing the unlicensed band channel may be unsuccessful. When the CCA procedure is successful, the device may transmit on the channel in the unlicensed band.

[0064] Because channel access is not guaranteed in an unlicensed band, a larger number of candidate SSB positions may be used in an unlicensed band compared to a licensed band. For example, a DRS transmission window in a licensed band may include 8 candidate SSB positions. A candidate SSB position is a position (e.g., in the time domain) where an SSB may be transmitted (e.g., permitted or allowed) (regardless of whether the SSB is actually transmitted at that position).

[0065] As shown in reference numeral 405, in an unlicensed band having a subcarrier spacing (SCS) of 30 kilohertz (kHz), there may be 20 candidate SSB positions in a 5 millisecond DRS transmission window, compared to 8 candidate SSB positions in a licensed band having an SCS of 30 kHz. In the unlicensed band, an SSB may have 8 possible SSB index values ​​(e.g., from 0 to 7, shown in brackets, and each index value may represent a different quasi-co-location characteristic of the corresponding SSB), and these index values ​​may be repeated one or more times in different SSB candidate positions in the DRS transmission window. As shown, candidate SSB positions 0 to 7 may carry SSBs with index values ​​0 to 7, respectively; candidate SSB positions 8 to 15 may carry SSBs with index values ​​0 to 7, respectively; and candidate SSB positions 16 to 19 may carry SSBs with index values ​​0 to 3, respectively. In this way, the number of opportunities for SSB transmission in the DRS transmission window is increased for the unlicensed band compared to the licensed band to mitigate the lower reliability of the unlicensed band (due to shared channel characteristics, access contention, etc.).

[0066] As shown in reference numeral 410, in an unlicensed band having an SCS of 15 kHz, there may be 10 candidate SSB positions in a 5 millisecond DRS transmission window, compared to 8 candidate SSB positions in a licensed band having an SCS of 30 kHz. In an unlicensed band, an SSB may have 8 possible SSB index values ​​(e.g., from 0 to 7, shown in brackets), and a portion of these index values ​​may be repeated at different SSB candidate positions in the DRS transmission window. As shown, candidate SSB positions 0 to 7 may carry SSBs with index values ​​0 to 7, respectively; and candidate SSB positions 8 and 9 may carry SSBs with index values ​​0 and 1, respectively. In this way, the number of opportunities for SSB transmission in the DRS transmission window is increased for the unlicensed band compared to the licensed band to mitigate the lower reliability of the unlicensed band (due to shared channel characteristics, access contention, etc.).

[0067] In example 400, the DRS transmission window has a duration of 5 milliseconds, which may be the maximum DRS transmission window duration. In some aspects, the DRS transmission window may have a duration of 0.5 milliseconds, 1 millisecond, 2 milliseconds, 3 milliseconds, 4 milliseconds, or 5 milliseconds, etc. In some aspects, the UE 120 may assume that the DRS transmission window duration is 5 milliseconds unless the UE 120 receives other indications. In example 400, for 15kHz SCS, the maximum number of candidate SSB positions within the DRS transmission window is 10, and for 30kHz SCS, the maximum number of candidate SSB positions is 20.

[0068] For 15kHz or 30kHz SCS, the 8 candidate SSB positions for the licensed band do not occupy the entire DRS transmission window, which leaves room for additional candidate SSB positions for the unlicensed band (e.g., up to 12 additional candidate SSB positions for 30kHz SCS and up to 2 additional candidate SSB positions for 15kHZ SCS). Figure 5 ), 64 candidate SSB positions are available in the licensed band and can occupy the entire DRS transmission window, which leaves no room for additional candidate SSB positions for the unlicensed band according to the existing candidate SSB pattern. Figure 6 ), 64 candidate SSB positions may be used in a licensed band and may occupy half of the DRS transmission window. Some techniques and apparatus described herein allow for the addition of additional candidate SSB positions for a 120 kHz or 240 kHz unlicensed band by introducing new designs or patterns for SSB candidate positions. In addition, some techniques and apparatus described herein introduce various indexing schemes for indexing additional candidate SSB positions (e.g., assigning SSB indices to additional candidate SSB positions).

[0069] As indicated above, Figure 4 are provided as examples. Other examples may differ from those described in Figure 4 Examples described.

[0070] Figure 5 is a diagram illustrating an example 500 of SSB locations in a licensed RF spectrum band with 120 kHz subcarrier spacing in accordance with various aspects of the present disclosure.

[0071] As shown in reference numeral 505, in a configuration including 14 orthogonal frequency division multiplexing (OFDM) symbols per time slot for a 120kHz SCS on a licensed band, up to 4 SSBs may be transmitted across two consecutive time slots. As shown in reference numeral 510, for a 120kHz SCS, a time slot may have a duration of 0.125 milliseconds. As shown in reference numeral 515, a DRS transmission window having a duration of 5 milliseconds on a band having a 120kHz SCS may be configured with a double-slot gap (e.g., having a length of 0.25 milliseconds) after every 8 time slots (e.g., 1 millisecond) including an SSB, for a total of four gaps (covering 8 time slots). Thus, a DRS transmission window may include up to 64 SSBs.

[0072] As indicated above, according to existing SSB modes such as Figure 5 ), which does not leave room for additional candidate SSB positions for the unlicensed band. Some techniques and apparatus described herein allow for the addition of additional candidate SSB positions for the 120 kHz unlicensed band by introducing new designs or patterns for SSB candidate positions. In addition, some techniques and apparatus described herein introduce various indexing schemes for indexing additional candidate SSB positions (e.g., assigning SSB indices to additional candidate SSB positions) and processing SSBs based at least in part on the indexing schemes.

[0073] As indicated above, Figure 5 are provided as examples. Other examples may differ from those described in Figure 5 Examples described.

[0074] Figure 6 is a diagram illustrating an example 600 of SSB locations in a licensed RF spectrum band with 240 kHz subcarrier spacing in accordance with various aspects of the present disclosure.

[0075] As shown in reference numeral 605, in a configuration including 14 OFDM symbols per time slot for a 240kHz SCS on a licensed band, up to 8 SSBs may be transmitted across four consecutive time slots. As shown in reference numeral 610, for an SCS of 240kHz, a time slot may have a duration of 0.0625 milliseconds. As shown in reference numeral 615, a DRS transmission window having a duration of 5 milliseconds on a band having an SCS of 240kHz may be configured with a four-slot gap (e.g., having a length of 0.25 milliseconds) after the first 16 time slots (e.g., 1 millisecond) including the SSBs. In addition, as shown in reference numeral 620, for an SCS of 240kHz, the SSBs may occupy only the first half of the DRS transmission window (e.g., the first 2.25 milliseconds). Thus, the DRS transmission window may include up to 64 SSBs. With this configuration, the SSB position for the 240 kHz SCS may be time-aligned with the SSB position for the 120 kHz SCS (at least in the first half of the 240 kHz DRS transmission window).

[0076] As indicated above, according to existing SSB modes such as Figure 6 ), which leaves no room for additional candidate SSB positions for the unlicensed band (at least in the first half of the DRS transmission window). Some techniques and apparatus described herein allow for the addition of additional candidate SSB positions for the 240 kHz unlicensed band by introducing new designs or patterns for SSB candidate positions. In addition, some techniques and apparatus described herein introduce various indexing schemes for indexing additional candidate SSB positions (e.g., assigning SSB indices to additional candidate SSB positions) and processing SSBs based at least in part on the indexing schemes.

[0077] As indicated above, Figure 6 are provided as examples. Other examples may differ from those described in Figure 6 Examples described.

[0078] Figure 7 is a diagram illustrating an example 700 of an SSB indexing scheme according to various aspects of the present disclosure. Figure 7 As shown in , base station 110 and UE 120 may communicate with each other.

[0079] As indicated by reference numeral 705, the base station 110 may determine an SSB index value (or a set of SSB index values ​​corresponding to a set of SSBs) for an SSB based at least in part on the SSB indexing scheme. The SSB may be included in a DRS transmission window. In some aspects, the DRS transmission window may include more than 64 candidate SSB positions. Additionally or alternatively, the DRS transmission window may have a duration of 5 milliseconds. In some aspects, the base station 110 may determine an SSB index value for an SSB transmission on an unlicensed band.

[0080] In some aspects, the SSB indexing scheme is a scheme in which a first subset of SSBs in a set of SSBs included in a DRS transmission window is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs in the set of SSBs included in the DRS transmission window is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and the earliest SSB included in the second subset of SSBs occurs before at least one SSB in the first subset of SSBs and has a higher index value than all SSBs in the first subset of SSBs. This is referred to herein as a “non-coherent indexing scheme” and is described below in conjunction with Figure 8 Describe in more detail.

[0081] In some aspects, the SSB indexing scheme is a scheme in which all SSBs included in the DRS transmission window are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. This is referred to herein as a "consistent indexing scheme" and is described below in conjunction with Fig. 9 Describe in more detail.

[0082] As shown in reference numeral 710, the base station 110 may transmit an SSB (e.g., in an unlicensed band), which may include an indication of an SSB index value determined by the base station 110 according to an indexing scheme (e.g., a consecutive indexing scheme or a non-consecutive indexing scheme). The base station 110 may transmit the SSB in a candidate SSB position of a DRS transmission window (e.g., one of more than 64 candidate SSB positions of the DRS transmission window). In some aspects, the SSB index value may be indicated based at least in part on a PBCH demodulation reference signal (DMRS) sequence index, an SCS of a frequency band on which the SSB is transmitted, a PBCH payload, and the like. In some aspects, the base station 110 may transmit the SSB in all candidate SSB positions. In some aspects, the base station 110 may transmit the SSB in less than all candidate SSB positions, such as when less than all candidate SSB positions are configured or used by the base station 110 for actual SSB transmission, when the base station 110 cannot obtain channel access to the unlicensed band in a portion of the DRS transmission window, and the like.

[0083] As indicated by reference numeral 715, UE 120 may detect an SSB within a DRS transmission window on an unlicensed band and may determine an SSB index value for the SSB based at least in part on an SSB indexing scheme. As described above, the DRS transmission window may include more than 64 candidate SSB positions, and UE 120 may search (e.g., monitor) the candidate SSB positions within the DRS transmission window to obtain the SSB. As described above, the indexing scheme may be a coherent indexing scheme or a non-coherent indexing scheme. In some aspects, the wireless communication standard may specify whether to use a coherent indexing scheme or a non-coherent indexing scheme.

[0084] As indicated by reference numeral 720, UE 120 may determine cell timing based at least in part on the SSB index value. For example, an SSB having a particular index value may be located (e.g., located in the time domain) at a particular candidate SSB location that is fixed according to a wireless communication standard. After determining the SSB index value, UE 120 may identify a known location where the SSB having the index value will be located, and may adjust the cell timing accordingly (e.g., by adjusting the timing of a slot boundary, the timing of a symbol boundary, etc.).

[0085] As indicated by reference numeral 725, UE 120 and base station 110 may communicate based at least in part on the cell timing. For example, UE 120 may use the determined cell timing to synchronize communications with base station 110 (e.g., to transmit uplink communications in appropriate time slots and / or symbols that are time-aligned with base station 110, to receive downlink communications in appropriate time slots and / or symbols that are time-aligned with base station 110, etc.).

[0086] Using more than 64 candidate SSB positions in a DRS transmission window on an unlicensed band can enable base station 110 to transmit an SSB in a DRS transmission window (e.g., in a later portion of the window) even if base station 110 is unable to access the unlicensed band (e.g., in an earlier portion of the window) due to conflicts and / or contention on the unlicensed band. This can reduce waiting time compared to waiting for the next DRS transmission window to attempt an SSB transmission. In addition, this can improve reliability by enabling UE 120 to combine multiple SSBs within the same DRS transmission window (e.g., for decoding purposes).

[0087] As indicated above, Figure 7 are provided as examples. Other examples may differ from those described in Figure 7 Examples described.

[0088] Figure 8 is a diagram illustrating an example 800 of an SSB indexing scheme in accordance with various aspects of the present disclosure. Figure 8Example candidate SSB locations and corresponding SSB index values ​​in an unlicensed RF spectrum band with a 120kHz SCS are shown.

[0089] As above combined Figure 5 As described, in a configuration including 14 OFDM symbols per time slot for a 120 kHz SCS on a licensed band, a maximum of 4 SSBs may be transmitted across two consecutive time slots. As shown by reference numeral 805, for a 120 kHz SCS, a time slot may have a duration of 0.125 milliseconds. As shown by reference numeral 810, a DRS transmission window having a duration of 5 milliseconds on a band having a 120 kHz SCS may not be configured with a double slot gap after every 8 time slots including an SSB. For example, four candidate SSB positions may be included in the ninth and tenth time slots in the DRS transmission window (e.g., between 1 ms and 1.25 ms), in the nineteenth and twentieth time slots in the DRS transmission window (e.g., between 2.25 ms and 2.50 ms), in the twenty-ninth and thirtieth time slots in the DRS transmission window (e.g., between 3.5 ms and 3.75 ms), and / or in the thirty-ninth and fortieth time slots in the DRS transmission window (e.g., between 4.75 ms and 5 ms).

[0090] In some aspects, the DRS transmission window may include at least one candidate SSB position in each time slot in the DRS transmission window. Additionally or alternatively, the DRS transmission window may include a set of candidate SSB positions (e.g., up to four candidate SSB positions) in each 0.25 millisecond time period (e.g., every two time slots) of the DRS transmission window. With this candidate SSB pattern, the DRS transmission window may include up to 80 candidate SSB positions (e.g., 64 candidate SSB positions also included in the licensed band plus 16 additional candidate SSB positions in four double-slot intervals used in the licensed band). In this way, additional candidate SSB positions may be added for the 120 kHz unlicensed band by introducing a new design or pattern for the SSB candidate positions. Using additional candidate SSB positions in a DRS transmission window on an unlicensed band enables the base station 110 to transmit SSBs in the DRS transmission window (e.g., in a later portion of the window) even if the base station 110 is unable to access the unlicensed band (e.g., an earlier portion of the window) due to conflicts and / or contention on the unlicensed band. Compared to waiting for the next DRS transmission window to attempt SSB transmission, this can reduce waiting time. In addition, this can improve reliability by enabling UE 120 to combine multiple SSBs within the same DRS transmission window (e.g., for decoding purposes).

[0091] like Figure 8As shown, in some aspects, the SSBs may be indexed according to a non-coherent indexing scheme. In this scheme, a first SSB subset of the set of SSBs included in the DRS transmission window (a portion of which is shown by reference numeral 815) is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. In addition, a second SSB subset of the set of SSBs included in the DRS transmission window (a portion of which is shown by reference numeral 820) is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. In addition, the earliest SSB 825 included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value (e.g., shown as index value 64) than all SSBs in the first SSB subset.

[0092] In example 800, the first SSB subset occurs in the first to eighth time slots of the DRS transmission window (e.g., between 0 milliseconds and 1 millisecond), in the eleventh to eighteenth time slots of the DRS transmission window (e.g., between 1.25 milliseconds and 2.25 milliseconds), in the twenty-first to twenty-eighth time slots of the DRS transmission window (e.g., between 2.5 milliseconds and 3.5 milliseconds), and in the thirty-first to thirty-eighth time slots of the DRS transmission window (e.g., between 3.75 milliseconds and 4.75 milliseconds). The SSBs in the first SSB subset are indexed from 0 to 63 (for a total of 64 SSBs) in the order in which they occur in the time domain within the DRS transmission window.

[0093] Also in example 800, the second SSB subset occurs in the ninth and tenth time slots of the DRS transmission window (e.g., between 1 millisecond and 1.25 milliseconds), in the nineteenth and twentieth time slots of the DRS transmission window (e.g., between 2.25 milliseconds and 2.50 milliseconds), in the twenty-ninth and thirtieth time slots of the DRS transmission window (e.g., between 3.5 milliseconds and 3.75 milliseconds), and in the thirty-ninth and fortieth time slots of the DRS transmission window (e.g., between 4.75 milliseconds and 5 milliseconds). The SSBs in the second SSB subset are indexed from 64 to 79 (a total of 16 SSBs) in the order in which they occur in the time domain within the DRS transmission window. This results in the entire set of SSBs included in the DRS transmission window being indexed non-contiguously from the beginning of the DRS transmission window to the end of the DRS transmission window. For example, the first 16 SSBs will be indexed from 0-15, the next 4 SSBs will be indexed from 64-67, the next 16 SSBs will be indexed from 16-31, the next 4 SSBs will be indexed from 68-71, the next 16 SSBs will be indexed from 32-47, the next 4 SSBs will be indexed from 72-75, the next 16 SSBs will be indexed from 48-63, and the last 4 SSBs will be indexed from 76-79.

[0094] This non-coherent indexing scheme enables backward compatibility, where the legacy SSB indexing scheme can be reused for SSB indices 0 to 63. In this way, cell timing determination can be performed by legacy UEs without introducing additional complexity.

[0095] As indicated above, Figure 8 are provided as examples. Other examples may differ from those described in Figure 8 Examples described.

[0096] Fig. 9 is a diagram illustrating an example 900 of an SSB indexing scheme in accordance with various aspects of the present disclosure. Fig. 9 The above combination Figure 8 The same example candidate SSB positions described. Fig. 9 In , a coherent indexing scheme is shown.

[0097] like Fig. 9As shown, in some aspects, the SSBs may be indexed according to a coherent indexing scheme. In this scheme, all SSBs included in the DRS transmission window are indexed coherently in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. For example, for 80 candidate SSB positions, the 80 SSBs will be indexed in ascending order from 0 to 79 from the beginning of the DRS transmission window to the end of the DRS transmission window. Compared to a non-coherent indexing scheme, the coherent indexing scheme enables the UE 120 to perform PBCH combining across different candidate SSB positions with reduced complexity, thereby saving UE resources (e.g., processing resources, memory resources, etc.).

[0098] As indicated above, Fig. 9 are provided as examples. Other examples may differ from those described in Fig. 9 Examples described.

[0099] Fig.10 is a diagram illustrating an example 1000 of an SSB indexing scheme in accordance with various aspects of the present disclosure. Fig.10 Example candidate SSB locations in an unlicensed RF spectrum band with 240kHz SCS are shown.

[0100] As above combined Figure 6 As described, in a configuration including 14 OFDM symbols per time slot for a 240kHz SCS on a licensed band, up to 8 SSBs may be transmitted across four consecutive time slots. As indicated by reference numeral 1005, for a 240kHz SCS, a time slot may have a duration of 0.0625 milliseconds. As shown, a DRS transmission window for an unlicensed band may include a first half 1010 of the window carrying SSBs (e.g., from 0 milliseconds to 2.25 milliseconds of the window, up to 64 SSBs) and a second half 1015 of the window also carrying SSBs (e.g., from 2.25 milliseconds to 5 milliseconds of the window, up to 64 SSBs). With this configuration, a DRS transmission window may have up to 128 candidate SSB positions.

[0101] As shown by reference numeral 1020, in some aspects, the DRS transmission window may include a four-slot gap (e.g., having a length of 0.25 milliseconds) after every 16 slots (e.g., 1 millisecond) that include an SSB. For example, the DRS transmission window may not include a candidate SSB position (e.g., may include a gap in a candidate SSB position) in the seventeenth to twentieth slots (e.g., between 1 millisecond and 1.25 milliseconds), in the thirty-seventh to fortieth slots (e.g., between 2.25 milliseconds and 2.50 milliseconds), in the fifty-seventh to sixtieth slots (e.g., between 3.5 milliseconds and 3.75 milliseconds), and / or in the seventy-seventh to eightieth slots (e.g., between 4.75 milliseconds and 5 milliseconds).

[0102] In some aspects, the SSBs may be indexed according to a coherent indexing scheme. In this scheme, all SSBs included in the DRS transmission window are indexed coherently in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. For example, for 128 candidate SSB positions, the 128 SSBs will be indexed in ascending order from 0 to 127 from the beginning of the DRS transmission window toward the end of the DRS transmission window. Compared to the non-coherent indexing scheme, the coherent indexing scheme enables the UE 120 to perform PBCH combining across different candidate SSB positions with reduced complexity, thereby saving UE resources (e.g., processing resources, memory resources, etc.). In addition, the indexing scheme achieves backward compatibility, where the old SSB indexing scheme can be reused for SSB indexes 0 to 63. In this way, cellular cell timing determination can be performed by old UEs without introducing additional complexity.

[0103] As indicated above, Fig.10 are provided as examples. Other examples may differ from those described in Fig.10 Examples described.

[0104] Fig.11 is a diagram illustrating an example 1100 of an SSB indexing scheme in accordance with various aspects of the present disclosure. Fig.11 Example candidate SSB locations in an unlicensed RF spectrum band with 240kHz SCS are shown.

[0105] As above combined Figure 6 As described, in a configuration including 14 OFDM symbols per time slot for a 240 kHz SCS on a licensed band, up to 8 SSBs may be transmitted across four consecutive time slots. As indicated by reference numeral 1105, for a 240 kHz SCS, a time slot may have a duration of 0.0625 milliseconds. As shown, a DRS transmission window for an unlicensed band may include a first half 1110 of the window carrying SSBs (e.g., from 0 milliseconds to 2.25 milliseconds of the window, up to 64 SSBs) and a second half 1115 of the window also carrying SSBs (e.g., from 2.25 milliseconds to 5 milliseconds of the window, up to 64 SSBs), as described above in conjunction with Fig.10 As described.

[0106] Additionally or alternatively, a DRS transmission window having a duration of 5 milliseconds on a frequency band having an SCS of 240 kHz may not be configured with a four-slot gap (e.g., having a length of 0.25 milliseconds) after every 16 slots (e.g., 1 millisecond) including an SSB. For example, eight candidate SSB positions may be included in the seventeenth to twentieth slots in the DRS transmission window (e.g., between 1 millisecond and 1.25 milliseconds), in the thirty-seventh to fortieth slots in the DRS transmission window (e.g., between 2.25 milliseconds and 2.50 milliseconds), in the fifty-seventh to sixtieth slots in the DRS transmission window (e.g., between 3.5 milliseconds and 3.75 milliseconds), and / or in the seventy-seventh to eightieth slots in the DRS transmission window (e.g., between 4.75 milliseconds and 5 milliseconds).

[0107] In some aspects, the DRS transmission window may include at least one candidate SSB position in each time slot in the DRS transmission window. Additionally or alternatively, the DRS transmission window may include a set of candidate SSB positions (e.g., up to eight candidate SSB positions) in each 0.25 millisecond time period (e.g., every four time slots) of the DRS transmission window. With this candidate SSB pattern, the DRS transmission window may include up to 160 candidate SSB positions (e.g., 64 candidate SSB positions also included in the licensed band plus the second half of the window plus 96 additional candidate SSB positions in the four four-slot intervals used in the licensed band). In this way, additional candidate SSB positions may be added for the 240 kHz unlicensed band by introducing a new design or pattern for the SSB candidate positions. Using additional candidate SSB positions in a DRS transmission window on an unlicensed band can enable base station 110 to transmit an SSB in a DRS transmission window (e.g., in a later portion of the window) even if base station 110 is unable to access the unlicensed band (e.g., an earlier portion of the window) due to conflicts and / or contention on the unlicensed band. This can reduce waiting time compared to waiting for the next DRS transmission window to attempt an SSB transmission. In addition, this can improve reliability by enabling UE 120 to combine multiple SSBs within the same DRS transmission window (e.g., for decoding purposes).

[0108] In some aspects, the SSBs in the DRS transmission window may be indexed according to a coherent indexing scheme. In this scheme, all SSBs included in the DRS transmission window are indexed coherently in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. For example, for 160 candidate SSB positions, the 160 SSBs will be indexed in ascending order from 0 to 159 from the beginning of the DRS transmission window to the end of the DRS transmission window. Compared to the non-coherent indexing scheme, the coherent indexing scheme enables UE120 to perform PBCH combining across different candidate SSB positions with reduced complexity, thereby saving UE resources (e.g., processing resources, memory resources, etc.). In addition, the indexing scheme achieves backward compatibility, where the old SSB indexing scheme can be reused for SSB indexes 0 to 63. In this way, cellular cell timing determination can be performed by old UEs without introducing additional complexity.

[0109] In some aspects, the SSBs in the DRS transmission window may be indexed according to a non-coherent indexing scheme. In this scheme, the first SSB subset of the SSB set included in the DRS transmission window is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. In addition, the second SSB subset of the SSB set included in the DRS transmission window is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. In addition, the earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than one or more SSBs (e.g., the first 64 SSBs, the first 128 SSBs, or all SSBs) included in the first SSB subset. In some aspects, the earliest SSB included in the second SSB subset has an SSB index value of 64. In some aspects, the earliest SSB included in the second SSB subset has an SSB index value of 128.

[0110] In example 1100, the first SSB subset may occur in the first to sixteenth time slots of the DRS transmission window (e.g., between 0 milliseconds and 1 millisecond), in the twenty-first to thirty-sixth time slots of the DRS transmission window (e.g., between 1.25 milliseconds and 2.25 milliseconds), in the forty-first to fifty-sixth time slots of the DRS transmission window (e.g., between 2.5 milliseconds and 3.5 milliseconds), and in the sixty-first to seventy-sixth time slots of the DRS transmission window (e.g., between 3.75 milliseconds and 4.75 milliseconds). The SSBs in the first SSB subset are indexed from 0 to 127 (for a total of 128 SSBs) in the order in which they occur in the time domain within the DRS transmission window.

[0111] Also in example 1100, the second SSB subset occurs in the seventeenth to twentieth time slots of the DRS transmission window (e.g., between 1 millisecond and 1.25 milliseconds), in the thirty-seventh to fortieth time slots of the DRS transmission window (e.g., between 2.25 milliseconds and 2.50 milliseconds), in the fifty-seventh to sixtieth time slots of the DRS transmission window (e.g., between 3.5 milliseconds and 3.75 milliseconds), and in the seventy-seventh to eightieth time slots of the DRS transmission window (e.g., between 4.75 milliseconds and 5 milliseconds). The SSBs in the second SSB subset are indexed from 128 to 159 (for a total of 32 SSBs) in the order in which they occur in the time domain within the DRS transmission window. This results in the entire set of SSBs included in the DRS transmission window being indexed non-contiguously from the beginning of the DRS transmission window to the end of the DRS transmission window. For example, the first 32 SSBs will be indexed from 0-31, the next 8 SSBs will be indexed from 128-135, the next 32 SSBs will be indexed from 32-63, the next 8 SSBs will be indexed from 136-143, the next 32 SSBs will be indexed from 64-95, the next 8 SSBs will be indexed from 144-151, the next 32 SSBs will be indexed from 96-127, and the last 8 SSBs will be indexed from 152-159.

[0112] This non-coherent indexing scheme enables backward compatibility, where the legacy SSB indexing scheme can be reused for SSB indices 0 to 63. In this way, cell timing determination can be performed by legacy UEs without introducing additional complexity.

[0113] As indicated above, Fig.11 are provided as examples. Other examples may differ from those described in Fig.11 Examples described.

[0114] Fig.12 1 is a diagram illustrating an example process 1200, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 1200 is an example in which a UE (eg, UE 120, etc.) performs operations associated with an SSB indexing scheme.

[0115] As in Fig.12 10 , in some aspects, process 1200 may include detecting an SSB within a DRS transmission window that includes more than 64 candidate SSB positions (block 1210). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may detect an SSB within a DRS transmission window that includes more than 64 candidate SSB positions, as described above.

[0116] like Fig.12As further shown in FIG. 1 , in some aspects, process 1200 may include determining an index value for an SSB based at least in part on an indexing scheme for SSBs included in the DRS transmission window (block 1220). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may determine an index value for an SSB based at least in part on an indexing scheme for SSBs included in the DRS transmission window, as described above. In some aspects, the indexing scheme includes a consecutive indexing scheme in which all SSBs are consecutively indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. In some aspects, the indexing scheme includes a non-coherent indexing scheme, wherein a first subset of SSBs is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset.

[0117] like Fig.12 As further shown in FIG. 1 , in some aspects, process 1200 may include determining cell timing based at least in part on the index value (block 1230). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may determine cell timing based at least in part on the index value, as described above.

[0118] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0119] In a first aspect, the DRS transmission window includes a set of SSBs within each 0.25 millisecond period of the DRS transmission window.

[0120] In a second aspect, alone or in combination with the first aspect, the SSB is located within a DRS transmission window having a subcarrier spacing of 120 kHz.

[0121] In a third aspect, alone or in combination with one or more of the first and second aspects, the DRS transmission window has a duration of 5 milliseconds.

[0122] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the DRS transmission window includes 80 candidate SSB positions.

[0123] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the earliest SSB included in the second subset has an index value of 64.

[0124] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the earliest SSB included in the second subset has an index value of 128.

[0125] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the SSB is located within a DRS transmission window having a subcarrier spacing of 240 kHz.

[0126] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, a portion of the SSB is located in the second half of the DRS transmission window.

[0127] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the DRS transmission window includes 128 candidate SSB positions.

[0128] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the DRS transmission window includes 160 candidate SSB positions.

[0129] although Fig.12 An example block diagram of process 1200 is shown, but in some aspects, process 1200 may include Fig.12 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1200. Additionally or alternatively, two or more blocks of the process 1200 may be executed in parallel.

[0130] Fig.13 is a diagram illustrating an example process 1300, performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process 1300 is an example in which a base station (eg, base station 110, etc.) performs operations associated with an SSB indexing scheme.

[0131] like Fig.13As shown in , in some aspects, process 1300 may include determining an index value for an SSB included in a DRS transmission window based at least in part on an indexing scheme for SSBs included in the DRS transmission window that includes more than 64 candidate SSB positions (block 1310). For example, a base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may determine an index value for an SSB included in the DRS transmission window based at least in part on an indexing scheme for SSBs included in a DRS transmission window that includes more than 64 candidate SSB positions, as described above. In some aspects, the indexing scheme is a consecutive indexing scheme in which all SSBs are consecutively indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window. In some aspects, the indexing scheme is a non-coherent indexing scheme, wherein a first subset of SSBs is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset.

[0132] like Fig.13 As further shown in FIG. 1 , in some aspects, process 1300 may include transmitting an SSB and an indication of an index value in a candidate SSB position of a DRS transmission window (block 1320). For example, a base station (e.g., using transmit processor 220, controller / processor 240, memory 242, etc.) may transmit an SSB and an indication of an index value in a candidate SSB position of a DRS transmission window, as described above.

[0133] Process 1300 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0134] In a first aspect, the DRS transmission window includes a set of SSBs within each 0.25 millisecond period of the DRS transmission window.

[0135] In a second aspect, alone or in combination with the first aspect, the SSB is located within a DRS transmission window having a subcarrier spacing of 120 kHz.

[0136] In a third aspect, alone or in combination with one or more of the first and second aspects, the DRS transmission window has a duration of 5 milliseconds.

[0137] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the DRS transmission window includes 80 candidate SSB positions.

[0138] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the earliest SSB included in the second subset has an index value of 64.

[0139] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the earliest SSB included in the second subset has an index value of 128.

[0140] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the SSB is located within a DRS transmission window having a subcarrier spacing of 240 kHz.

[0141] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, a portion of the SSB is located in the second half of the DRS transmission window.

[0142] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, the DRS transmission window includes 128 candidate SSB positions.

[0143] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the DRS transmission window includes 160 candidate SSB positions.

[0144] although Fig.13 Example blocks of process 1300 are shown, but in some aspects, process 1300 may include Fig.13 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1300. Additionally or alternatively, two or more blocks of the process 1300 may be executed in parallel.

[0145] The following provides an overview of some aspects of the disclosure:

[0146] Aspect 1: A wireless communication method performed by a user equipment (UE), comprising: detecting a discovery reference signal (DRS) within a synchronization signal block (SSB) transmission window including more than 64 candidate SSB positions; determining an index value of the SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme comprises one of the following: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and determining the cellular cell timing based at least in part on the index value.

[0147] Aspect 2: The method of Aspect 1, wherein the DRS transmission window includes an SSB set within each 0.25 millisecond time period of the DRS transmission window.

[0148] Aspect 3: The method of any of the preceding aspects, wherein the DRS transmission window has a duration of 5 milliseconds.

[0149] Aspect 4: The method of any of the preceding aspects, wherein the SSB is located within a DRS transmission window having a subcarrier spacing of 120 kHz.

[0150] Aspect 5: A method as in any of the preceding aspects, wherein the DRS transmission window comprises 80 candidate SSB positions.

[0151] Aspect 6: The method of any of the preceding aspects, wherein the earliest SSB included in the second subset has an index value of 64.

[0152] Aspect 7: The method of any one of aspects 1-5, wherein the earliest SSB included in the second subset has an index value of 128.

[0153] Aspect 8: The method of any one of aspects 1-3, wherein the SSB is located within a DRS transmission window having a subcarrier spacing of 240 kHz.

[0154] Aspect 9: The method of Aspect 8, wherein a portion of the SSB is located in the second half of the DRS transmission window.

[0155] Aspect 10: The method of any one of Aspects 1-9, wherein the DRS transmission window includes 128 candidate SSB positions.

[0156] Aspect 11: The method of any one of Aspects 1-9, wherein the DRS transmission window includes 160 candidate SSB positions.

[0157] Aspect 12: A wireless communication method performed by a base station, comprising: determining an index value of an SSB included in a discovery reference signal (DRS) transmission window including more than 64 candidate synchronization signal block (SSB) positions based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme comprises one of the following: a consecutive indexing scheme, wherein all SSBs are indexed consecutively in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, or a non-consecutive indexing scheme, wherein a first subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second subset of SSBs are indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein the earliest SSB included in the second subset occurs before at least one SSB in the first subset and has a higher index value than all SSBs in the first subset; and transmitting the SSB and an indication of the index value in the candidate SSB position of the DRS transmission window.

[0158] Aspect 13: The method of Aspect 12, wherein the DRS transmission window includes an SSB set within each 0.25 millisecond time period of the DRS transmission window.

[0159] Aspect 14: The method of any one of aspects 12-13, wherein the DRS transmission window has a duration of 5 milliseconds.

[0160] Aspect 15: The method of any one of aspects 12-14, wherein the SSB is located within a DRS transmission window having a subcarrier spacing of 120 kHz.

[0161] Aspect 16: The method of any one of Aspects 12-15, wherein the DRS transmission window includes 80 candidate SSB positions.

[0162] Aspect 17: The method of any of Aspects 12-16, wherein the earliest SSB included in the second subset has an index value of 64.

[0163] Aspect 18: The method of any of Aspects 12-16, wherein the earliest SSB included in the second subset has an index value of 128.

[0164] Aspect 19: The method of any one of aspects 12-14, wherein the SSB is located within a DRS transmission window having a subcarrier spacing of 240 kHz.

[0165] Aspect 20: The method of Aspect 19, wherein a portion of the SSB is located in the second half of the DRS transmission window.

[0166] Aspect 21: The method of any one of Aspects 12-20, wherein the DRS transmission window includes 128 candidate SSB positions.

[0167] Aspect 22: The method of any one of Aspects 12-20, wherein the DRS transmission window includes 160 candidate SSB positions.

[0168] Aspect 23: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in one or more of Aspects 1-11.

[0169] Aspect 24: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more aspects of aspects 1-11.

[0170] Aspect 25: An apparatus for wireless communication, comprising at least one means for performing the method of one or more aspects of aspects 1-11.

[0171] Aspect 26: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 1-11.

[0172] Aspect 27: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more aspects of aspects 1-11.

[0173] Aspect 28: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in one or more aspects of aspects 12-22.

[0174] Aspect 29: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more aspects of aspects 12-22.

[0175] Aspect 30: An apparatus for wireless communication, comprising at least one means for performing the method of one or more aspects of aspects 12-22.

[0176] Aspect 31: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 12-22.

[0177] Aspect 32: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more aspects of aspects 12-22.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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 not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim 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 quoting "at least one of" a column of items refers to any combination of these items, including a single member. 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).

[0183] 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 user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: detecting a synchronization signal block (SSB) within a discovery reference signal (DRS) transmission window that includes more than 64 candidate SSB locations; determining an index value for the SSB based at least in part on an indexing scheme for SSBs included in the DRS transmission window, wherein the indexing scheme comprises: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; as well as Cell timing is determined based at least in part on the index value.

2. The UE of claim 1, wherein the DRS transmission window includes an SSB set within each 0.25 millisecond time period of the DRS transmission window.

3. The UE of claim 1, wherein the DRS transmission window has a duration of 5 milliseconds.

4. The UE of claim 1, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 120 kHz.

5. The UE of claim 1, wherein the DRS transmission window includes 80 candidate SSB positions. 6 . The UE of claim 1 , wherein the earliest SSB included in the second SSB subset has an index value of 64.

7. The UE of claim 1, wherein the earliest SSB included in the second SSB subset has an index value of 128.

8. The UE of claim 1, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 240 kHz.

9. The UE of claim 8, wherein a portion of the SSB is located in a second half of the DRS transmission window.

10. The UE of claim 1, wherein the DRS transmission window includes 128 candidate SSB positions.

11. The UE of claim 1, wherein the DRS transmission window includes 160 candidate SSB positions.

12. A network entity for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: Determining an index value for an SSB included in a discovery reference signal (DRS) transmission window based at least in part on an indexing scheme for SSBs included in the DRS transmission window that includes more than 64 candidate synchronization signal block (SSB) locations, wherein the indexing scheme includes: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; as well as The SSB and an indication of the index value are transmitted in a candidate SSB position of the DRS transmission window.

13. The network entity of claim 12, wherein the DRS transmission window includes a set of SSBs within each 0.25 millisecond time period of the DRS transmission window.

14. The network entity of claim 12, wherein the DRS transmission window has a duration of 5 milliseconds.

15. The network entity of claim 12, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 120 kHz.

16. The network entity of claim 12, wherein the DRS transmission window includes 80 candidate SSB positions.

17. The network entity of claim 12, wherein an earliest SSB included in the second SSB subset has an index value of 64.

18. The network entity of claim 12, wherein an earliest SSB included in the second SSB subset has an index value of 128.

19. The network entity of claim 12, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 240 kHz.

20. The network entity of claim 19, wherein a portion of the SSB is located in a second half of the DRS transmission window.

21. The network entity of claim 12, wherein the DRS transmission window comprises 128 candidate SSB positions.

22. The network entity of claim 12, wherein the DRS transmission window includes 160 candidate SSB positions.

23. A wireless communication method performed by a user equipment (UE), comprising: detecting a synchronization signal block (SSB) within a discovery reference signal (DRS) transmission window that includes more than 64 candidate SSB locations; determining an index value for the SSB based at least in part on an indexing scheme for SSBs included in the DRS transmission window, wherein the indexing scheme comprises: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; as well as Cell timing is determined based at least in part on the index value.

24. The method of claim 23, wherein the DRS transmission window includes a set of SSBs within each 0.25 millisecond time period of the DRS transmission window.

25. The method of claim 23, wherein the DRS transmission window has a duration of 5 milliseconds.

26. The method of claim 23, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 120 kHz or 240 kHz.

27. The method of claim 23, wherein the DRS transmission window includes 80 candidate SSB positions.

28. The method of claim 23, wherein the earliest SSB included in the second SSB subset has an index value of 64.

29. The method of claim 23, wherein the earliest SSB included in the second SSB subset has an index value of 128.

30. A wireless communication method performed by a network entity, comprising: Determining an index value for an SSB included in a discovery reference signal (DRS) transmission window based at least in part on an indexing scheme for SSBs included in the DRS transmission window that includes more than 64 candidate synchronization signal block (SSB) locations, wherein the indexing scheme includes: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; and The SSB and an indication of the index value are transmitted in a candidate SSB position of the DRS transmission window.

31. 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 one or more processors to: detecting a synchronization signal block (SSB) within a discovery reference signal (DRS) transmission window that includes more than 64 candidate SSB locations; determining an index value for the SSB based at least in part on an indexing scheme for SSBs included in the DRS transmission window, wherein the indexing scheme comprises: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; as well as Cell timing is determined based at least in part on the index value.

32. The non-transitory computer-readable medium of claim 31, wherein the DRS transmission window includes a set of SSBs within each 0.25 millisecond time period of the DRS transmission window.

33. The non-transitory computer readable medium of claim 31, wherein the DRS transmission window has a duration of 5 milliseconds.

34. The non-transitory computer readable medium of claim 31, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 120 kHz.

35. The non-transitory computer-readable medium of claim 31, wherein the DRS transmission window includes 80 candidate SSB locations.

36. The non-transitory computer-readable medium of claim 31, wherein the earliest SSB included in the second subset of SSBs has an index value of 64.

37. The non-transitory computer-readable medium of claim 31, wherein the earliest SSB included in the second SSB subset has an index value of 128.

38. The non-transitory computer-readable medium of claim 31, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 240 kHz.

39. The non-transitory computer-readable medium of claim 38, wherein a portion of the SSB is located in a second half of the DRS transmission window.

40. The non-transitory computer-readable medium of claim 31, wherein the DRS transmission window includes 128 candidate SSB positions.

41. The non-transitory computer-readable medium of claim 31 , wherein the DRS transmission window comprises 160 candidate SSB locations.

42. A device for wireless communication, comprising: means for detecting a synchronization signal block (SSB) within a discovery reference signal (DRS) transmission window including more than 64 candidate SSB locations; means for determining an index value for the SSB based at least in part on an indexing scheme for the SSBs included in the DRS transmission window, wherein the indexing scheme comprises: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; as well as Means for determining cell timing based at least in part on the index value.

43. 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 network entity, cause the one or more processors to: Determining an index value for an SSB included in a discovery reference signal (DRS) transmission window based at least in part on an indexing scheme for SSBs included in the DRS transmission window that includes more than 64 candidate synchronization signal block (SSB) locations, wherein the indexing scheme includes: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; and The SSB and an indication of the index value are transmitted in a candidate SSB position of the DRS transmission window.

44. The non-transitory computer-readable medium of claim 43, wherein the DRS transmission window includes a set of SSBs within each 0.25 millisecond time period of the DRS transmission window.

45. The non-transitory computer readable medium of claim 43, wherein the DRS transmission window has a duration of 5 milliseconds.

46. ​​The non-transitory computer readable medium of claim 43, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 120 kHz.

47. The non-transitory computer-readable medium of claim 43, wherein the DRS transmission window comprises 80 candidate SSB locations.

48. A non-transitory computer-readable medium as described in claim 43, wherein the earliest SSB included in the second SSB subset has an index value of 64.

49. A non-transitory computer-readable medium as described in claim 43, wherein the earliest SSB included in the second SSB subset has an index value of 128.

50. The non-transitory computer readable medium of claim 43, wherein the SSB is located within the DRS transmission window having a subcarrier spacing of 240 kHz.

51. The non-transitory computer-readable medium of claim 50, wherein a portion of the SSB is located in a second half of the DRS transmission window.

52. The non-transitory computer-readable medium of claim 43, wherein the DRS transmission window comprises 128 candidate SSB positions.

53. The non-transitory computer-readable medium of claim 43, wherein the DRS transmission window includes 160 candidate SSB locations.

54. A device for wireless communication, comprising: Means for determining an index value for a synchronization signal block (SSB) included in a discovery reference signal (DRS) transmission window based at least in part on an indexing scheme for SSBs included in the DRS transmission window that includes more than 64 candidate SSB locations, wherein the indexing scheme comprises: a non-contiguous indexing scheme, wherein a first SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, and a second SSB subset is indexed in ascending order from an earlier position in the DRS transmission window to a later position in the DRS transmission window, wherein an earliest SSB included in the second SSB subset occurs before at least one SSB in the first SSB subset and has a higher index value than all SSBs in the first SSB subset; and Means for transmitting the SSB and an indication of the index value in a candidate SSB position of the DRS transmission window.

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