Methods and apparatus for processing synchronization signal block in mobile communications
Patent Information
- Application Number
- PCT/CN2026/076943
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-20
- Filing Date
- 2026-02-04
- Publication Date
- 2026-08-27
Smart Images

Figure CN2026076943_27082026_PF_FP_ABST
Abstract
Description
METHODS AND APPARATUS FOR PROCESSING SYNCHRONIZATION SIGNAL BLOCK IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure is part of a non-provisional application claiming the priority benefit of U.S. Patent Application No. 63 / 760,724, filed 20 February 2025, the content of which herein being incorporated by reference in its entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to processing Synchronization Signal Block (SSB) with respect to apparatus in mobile communications.BACKGROUND
[0003] Unless otherwise indicated herein, approaches described in this section are not prior art to the claims listed below and are not admitted as prior art by inclusion in this section.
[0004] In New Radio (NR) mobile communication systems, system overhead and User Equipment (UE) processing complexity remain major concerns that may adversely impact spectral efficiency and power consumption. In particular, synchronization procedures performed during initial access may contribute significantly to such overhead and complexity. For example, in typical 5G deployments, a Synchronization Signal Block (SSB) occupies four Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and twenty resource blocks (RBs) in the frequency domain, and includes a Primary Synchronization Signal (PSS) , a Secondary Synchronization Signal (SSS) , and a Physical Broadcast Channel (PBCH) carrying a Master Information Block (MIB) .
[0005] During an initial cell search procedure, the UE acquires initial network timing and carrier frequency information based on the received SSB. In conventional 5G systems, the UE typically relies on the PSS to perform a two-dimensional search, including a first dimension corresponding to a plurality of candidate timing offsets and a second dimension corresponding to multiple frequency offset hypotheses. For each combination of a timing offset and a frequency bin, the UE performs correlation operations based on the PSS, which may lead to increased processing complexity, higher power consumption, and increased access delay.
[0006] As mobile communication systems continue to evolve toward higher carrier frequencies, expanded transmission bandwidths, and increasingly stringent requirements on energy efficiency, including those contemplated for future-generation network systems (e.g., 6G network systems) , the overhead and processing complexity associated with conventional synchronization signal designs may increasingly limit system performance and UE efficiency.
[0007] Accordingly, there exists a need for improved synchronization signal structures and associated processing schemes that may reduce UE complexity and synchronization overhead while maintaining reliable time and frequency acquisition.SUMMARY
[0008] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0009] An objective of the present disclosure is to propose solutions or schemes that address the aforementioned issues pertaining to processing Synchronization Signal Block (SSB) with respect to apparatus in mobile communications.
[0010] In one aspect, a method may involve an apparatus receiving an SSB. The SSB may include a Physical Broadcast Channel (PBCH) and exclude Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) . The method may further involve the apparatus processing the SSB to perform time-domain synchronization based on the PBCH.
[0011] In one aspect, a method may involve an apparatus determining an SSB. The SSB may include a PBCH and exclude PSS and SSS. The method may further involve the apparatus transmitting the SSB for performing time-domain synchronization based on the PBCH.
[0012] In one aspect, an apparatus may include a transceiver and a processor coupled to the transceiver. The transceiver may be configured to communicate wirelessly. The processor may perform operations comprising receiving, via the transceiver, an SSB. The SSB may include a PBCH and exclude PSS and SSS. The processor may further perform operations comprising processing the SSB to perform time-domain synchronization based on the PBCH.
[0013] In one aspect, an apparatus may include a transceiver and a processor coupled to the transceiver. The transceiver may be configured to communicate wirelessly. The processor may perform operations comprising determining an SSB. The SSB may include a PBCH and exclude PSS and SSS. The processor may further perform operations comprising transmitting, via the transceiver, the SSB for performing time-domain synchronization based on the PBCH.
[0014] It is noteworthy that, although description provided herein may be in the context of certain radio access technologies, networks and network topologies such as Long-Term Evolution (LTE) , LTE-Advanced, LTE-Advanced Pro, 5th Generation (5G) , New Radio (NR) , Internet-of-Things (IoT) and Narrow Band Internet of Things (NB-IoT) , Industrial Internet of Things (IIoT) , and 6th Generation (6G) , the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0016] FIG. 1 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0017] FIG. 2 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0018] FIG. 3 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0019] FIG. 4 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0020] FIG. 5 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0021] FIG. 6 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0022] FIG. 7 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0023] FIG. 8 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0024] FIG. 9 is a block diagram of an example communication system in accordance with an implementation of the present disclosure.
[0025] FIG. 10 is a flowchart of an example process in accordance with an implementation of the present disclosure.
[0026] FIG. 11 is a flowchart of an example process in accordance with an implementation of the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0027] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0028] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to processing Synchronization Signal Block (SSB) with respect to apparatus in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0029] Regarding the present disclosure, a network node may determine an SSB. The SSB may include a Physical Broadcast Channel (PBCH) and exclude Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) . The network node may transmit the SSB to a User Equipment (UE) . After receiving the signal, the UE may process the SSB to perform time-domain synchronization based on the PBCH.
[0030] More specifically, the UE may process the SSB to perform one-dimensional time-domain synchronization based on the PBCH without joint time-frequency searching and may subsequently perform one-dimensional frequency-domain synchronization. Accordingly, compared with a joint time-frequency two-dimensional searching process, performing separate one-dimensional searches in the time domain and the frequency domain may significantly reduce computational burden and processing complexity. As a result, UE synchronization complexity may be reduced, power consumption may be lowered, and initial access latency may be improved.
[0031] FIG. 1 illustrates an example scenario 100 under schemes in accordance with implementations of the present disclosure. Scenario 100 involves a network side and one or more UEs, which may be a part of a wireless communication network (e.g., an LTE network, a 5G / NR network, an IoT network or a 6G network) . Scenario 100 illustrates the current network framework. The UEs may connect to the network side. The network side may comprise one or more than one network nodes. For illustrative purposes, one network node and one UE may be described hereinafter. However, it is not intended to limit the network scenarios of the present disclosure.
[0032] In some embodiments, the network node may determine an SSB. The SSB may include a PBCH and exclude PSS and SSS. In other words, the SSB may be simplified by excluding PSS and SSS. The network node may transmit the SSB to the UE. It should be noted that this SSS may correspond to a conventionally arranged SSS.
[0033] In some implementations, the PBCH may be carried by multi-symbol set (s) . More specifically, the PBCH may be carried by at least one two-symbol PBCH burst. In some cases, a number of Resource Blocks (RBs) corresponding to each two-symbol PBCH burst may be associated with a carrier bandwidth. For example, as the carrier bandwidth increases, the number of RBs associated with one two-symbol PBCH burst increases, whereas as the carrier bandwidth decreases, the number of RBs associated with one two-symbol PBCH burst decreases.
[0034] FIG. 2 illustrates an example scenario 200 under schemes in accordance with implementations of the present disclosure. In some cases, for a larger carrier bandwidth, the SSB may be determined with a narrow bandwidth of N RBs (e.g., N=32) . In the time domain, the PBCH may be carried by one two-symbol PBCH burst, while the two-symbol PBCH burst may include two repeated PBCH symbols.
[0035] FIG. 3 illustrates an example scenario 300 under schemes in accordance with implementations of the present disclosure. In some cases, for a narrower carrier bandwidth, the SSB may be determined with a narrow bandwidth of N RBs (e.g., N=16) . In the time domain, the PBCH may be carried by two two-symbol PBCH bursts, while each two-symbol PBCH burst may include two repeated PBCH symbols.
[0036] FIG. 4 illustrates an example scenario 400 under schemes in accordance with implementations of the present disclosure. In some cases, for a smaller carrier bandwidth, the SSB may be determined with a narrow bandwidth of N RBs (e.g., N=6) . In the time domain, the PBCH may be carried by six two-symbol PBCH bursts, while each two-symbol PBCH burst may include two repeated PBCH symbols.
[0037] In some implementations, an RB corresponding to the PBCH may include a plurality of data Resource Elements (REs) and a plurality of pilot REs. In some cases, the plurality of pilot REs may be used as: (1) SSS and / or (2) Demodulation Reference Signal (DMRS) . It should be noted that this SSS may correspond to the plurality of pilot REs used as SSS. The pilot REs may be used to perform at least one of: (1) identifying a physical cell identification, and (2) PBCH channel and noise estimation. FIG. 5 illustrates an example scenario 500 under schemes in accordance with implementations of the present disclosure. For example, unlike a 5G structure in which three DMRSs are allocated per RB, in the present disclosure, the pilot REs used as SSS / DMRS within one RB are fixed at RE subcarrier indices {1, 4, 7, 10} from an RE subcarrier index set {0, 1, 2, …, 10, 11} . Accordingly, within one OFDM symbol, each RB includes four fixed pilot REs used as SSS / DMRS and eight data REs.
[0038] More specifically, the pilot REs may be used as SSS to identify the physical cell identification in a manner similar to existing 5G SSS designs. The pilot REs may subsequently be reused as DMRS for PBCH demodulation and decoding. In some cases, a 5G SSS sequence may be reused as PBCH DMRS, where the sequence may be a real-valued sequence formed as a product of two length-127 m-sequences. When a larger number of DMRS REs is available (e.g., 128 DMRS REs) , the SSS sequence may be repeated to populate the DMRS REs.
[0039] For example, the 5G SSS sequence is reproduced below, which is a product of two length 127 m-sequences: dSSS (n) =[1-2·x0( (n+m0) mod127) ]·[1-2·x1( (n+m1) mod127) ] where m0 and m1 depend on the physical cell identification as follows:
[0040] Due to the removal of PSS from the SSB of the present disclosure, the UE may no longer detect based on PSS. Accordingly, one example is to set SSS based on only as follows:
[0041] In some implementations, each two-symbol PBCH burst may include a first PBCH symbol and a second PBCH symbol. RBs in the second PBCH symbol may correspond to RBs in the first PBCH symbol with a frequency-domain phase ramping applied. In other words, in a two-symbol PBCH burst, PBCH RBs in the second PBCH symbol may be identical to those carried by the first PBCH symbol, with an added frequency-domain phase ramping. In some cases, the frequency-domain phase ramping may be applied to the second PBCH symbol based on an Orthogonal Frequency Division Multiplexing (OFDM) Cyclic Prefix (CP) length.
[0042] In particular, the frequency-domain phase ramping may result in a cyclic time-domain shift of narrowband PBCH samples corresponding to the second PBCH symbol by the OFDM CP length. In the time domain, the effect of the frequency-domain phase ramping may cause the narrowband PBCH samples to appear cyclically shifted earlier by the OFDM CP length.
[0043] FIG. 6 illustrates an example scenario 600 under schemes in accordance with implementations of the present disclosure. More specifically, consider a slot including two PBCH symbols (e.g., the first symbol and the second symbol of the two-symbol PBCH burst) in the time-domain. When the two PBCH symbols are configured as simple repetitions, it may be observed that a first time-domain spacing between the two PBCH symbols may correspond to one OFDM symbol duration plus one CP duration. The first time-domain spacing may differ from a CP repetition pattern, in which a second time-domain spacing may correspond to one OFDM symbol duration. Such a difference in repetition spacing may prevent the effective combination of the two time-domain repetition patterns. In addition, the PBCH may occupy N RBs (e.g., N = 32) , while an overall carrier bandwidth may include a substantially larger number of RBs. Repeating all RBs for the second PBCH symbol may therefore be undesirable, as such repetition may result in inefficient use of bandwidth resources.
[0044] Therefore, a PBCH time-repetition scheme may be introduced at the network node in a specific manner. For the PBCH RBs in the second PBCH symbol of one two-symbol PBCH burst, the network node may transmit the same information as that carried by the PBCH RBs in the first PBCH symbol, with an added frequency-domain phase ramping corresponding to a CP duration. Other RBs in the second PBCH symbol may remain unaffected.
[0045] FIG. 7 illustrates an example scenario 700 under schemes in accordance with implementations of the present disclosure. On the UE side, after extracting only the PBCH RBs through narrowband processing, a modified time-domain repetition pattern, as shown in a right portion of FIG. 7, may be observed due to the frequency-domain phase ramping. More specifically, the second PBCH symbol may be cyclically shifted by the CP duration in the time domain. As a result, a time-domain spacing between two repeated PBCH symbol samples may be adjusted to correspond to one OFDM symbol duration.
[0046] In summary, the present disclosure may provide a PBCH transmission and repetition scheme in which a two-symbol PBCH burst may be configured such that PBCH RBs in the second PBCH symbol correspond to those in the first PBCH symbol with the added frequency-domain phase ramping based on the CP length. Through such frequency-domain phase ramping, the second PBCH symbol may exhibit an effective cyclic time-domain shift, thereby aligning a repetition spacing of PBCH symbols with a CP repetition pattern. This alignment may enable an effective combination of PBCH symbol repetition and CP repetition for time-domain processing. In addition, the proposed scheme may limit repetition to PBCH RBs only, while leaving other RBs unaffected, thereby avoiding unnecessary bandwidth overhead.
[0047] FIG. 8 illustrates an example scenario 800 under schemes in accordance with implementations of the present disclosure. In some implementations, the repeated sample pattern (s) (e.g., the two-symbol PBCH burst (s) ) within a PBCH slot (i.e., the slot including PBCH transmission) may be utilized to detect PBCH timing. In order to facilitate such processing, consider an ith OFDM symbol including a CP. A CP vector associated with the ith OFDM symbol may be denoted as y0, i, and a corresponding vector at an end portion of the OFDM symbol may be denoted as y1, i. An initial carrier phase associated with y0, i may be denoted as Accordingly, a carrier phase associated with y1, i may be expressed as where θ=2πΔfτs. Δf may represent a Carrier Frequency Offset (CFO) at the UE, and τs may represent an OFDM symbol duration excluding the CP.
[0048] When correlation operations are performed over CPs within a slot, a correlation result may be expressed as: where the initial carrier phase term is canceled, and each CP segment shares a common phase rotation term ejθ. The vectors and correspond to CP vectors y0, i and y1, i without the CFO effect.
[0049] In addition to CP-based correlation, PBCH symbol repetition within the slot may also be exploited to compute time-domain correlation. Specifically, a combined correlation metric R may be expressed as: where p0, j and p1, j denote first and second symbol vectors, respectively, in a jth two-symbol PBCH burst, and and denote corresponding vectors without the CFO effect. Due to a common time-domain spacing of one OFDM symbol duration between repeated samples, the phase rotation term ejθ may be factored out from the correlation expression.
[0050] From the above derivation, it may be observed that an amplitude of the correlation metric R may be independent of the carrier frequency offset. As a result, a conventional joint time-frequency two-dimensional search procedure may be reduced to a one-dimensional time-domain search. After a timing offset is determined, the correlation metric R may further be utilized to estimate the CFO.
[0051] In some implementations, during a PBCH slot (i.e., a slot including the PBCH) , data may be received on all RBs within the SSB. In some cases, the SSB and payload of the data may use the same spatial beam. In some cases, the data may include: (1) system information (e.g., SIB) , (2) paging information and / or (3) randomly generated Quadrature Phase Shift Keying (QPSK) channel symbols.
[0052] More specifically, the present disclosure may utilize repeated PBCH symbols and CPs within a slot to detect PBCH timing and to estimate a CFO at the UE. Such processing may require that data transmissions be present within a PBCH slot, at least on RBs allocated for a PBCH.
[0053] From a UE low-power operation perspective, it may be desirable for the UE to monitor a narrow bandwidth during initial access procedures or idle-mode processing. In the context of future-generation network designs (e.g., 6G systems) , a suitable narrowband selection may correspond to simplified SSB RBs. The network node may transmit essential System Information Blocks (SIBs) using these PBCH RBs. In terms consistent with 5G systems, such SIBs may include, for example, SIB1, SIB2, SIB3, through SIB10. These SIBs may be repartitioned into appropriate payload sizes and may initially occupy remaining OFDM symbols within a narrowband PBCH slot, excluding OFDM symbols used for PBCH transmission.
[0054] From a beamforming perspective, PBCH transmissions carrying a MIB and transmissions of essential SIBs may be performed using a same or similar spatial beam. When the PBCH slot becomes fully utilized, additional slots within the same narrowband may be employed to carry remaining SIBs. In addition, paging information may also be transmitted within the PBCH slot using the PBCH RBs.
[0055] When the PBCH RBs or the PBCH slot are not fully loaded with system information or paging data, the network node may transmit randomly generated filler channel bits modulated using QPSK. Such filler bits may occupy the same RBs within the PBCH slot and may be transmitted using the same spatial beam as the PBCH, thereby ensuring the presence of payload data while maintaining beam consistency.
[0056] In some implementations, a PBCH channel rate matching may be performed based on one-half of a total number of channel bits that the PBCH is capable of carrying. In particular, due to a repetition characteristic of two PBCH symbols within one two-symbol PBCH burst, the PBCH channel rate matching may be configured such that an effective number of channel bits corresponds to Npbch / 2, where Npbch represents the total number of channel bits that the PBCH is capable of carrying. Illustrative Implementations
[0057] FIG. 9 illustrates an example communication system 900 having an example communication apparatus 910 and an example network apparatus 920 in accordance with an implementation of the present disclosure. Each of communication apparatus 910 and network apparatus 920 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to processing SSB with respect to UE and network apparatus in mobile communications, including scenarios / schemes described above as well as processes 1000 and 1100 described below.
[0058] Communication apparatus 910 may be a part of an electronic apparatus, which may be a UE such as a portable or mobile apparatus, a wearable apparatus, a wireless communication apparatus or a computing apparatus. For instance, communication apparatus 910 may be implemented in a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. Communication apparatus 910 may also be a part of a machine type apparatus, which may be an IoT, NB-IoT, or IIoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus. For instance, communication apparatus 910 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. Alternatively, communication apparatus 910 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors. Communication apparatus 910 may include at least some of those components shown in FIG. 9 such as a processor 912, for example. Communication apparatus 910 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of communication apparatus 910 are neither shown in FIG. 9 nor described below in the interest of simplicity and brevity.
[0059] Network apparatus 920 may be a part of a network apparatus, which may be a network node such as a satellite, a base station, a small cell, a router or a gateway. For instance, network apparatus 920 may be implemented in an eNodeB in an LTE network, in a gNB in a 5G / NR, IoT, NB-IoT or IIoT network or in a satellite or base station in a 6G network. Alternatively, network apparatus 920 may be implemented in the form of one or more IC chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more RISC or CISC processors. Network apparatus 920 may include at least some of those components shown in FIG. 9 such as a processor 922, for example. Network apparatus 920 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of network apparatus 920 are neither shown in FIG. 9 nor described below in the interest of simplicity and brevity.
[0060] In one aspect, each of processor 912 and processor 922 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “aprocessor” is used herein to refer to processor 912 and processor 922, each of processor 912 and processor 922 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of processor 912 and processor 922 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of processor 912 and processor 922 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks including processing SSB in a device (e.g., as represented by communication apparatus 910) and a network (e.g., as represented by network apparatus 920) in accordance with various implementations of the present disclosure.
[0061] In some implementations, communication apparatus 910 may also include a transceiver 916 coupled to processor 912 and capable of wirelessly transmitting and receiving data. In other words, processor 912 may transceive the data such as configuration, message, signal, information, indicator, etc. via transceiver 916. In some implementations, communication apparatus 910 may further include a memory 914 coupled to processor 912 and capable of being accessed by processor 912 and storing data therein. In some implementations, network apparatus 920 may also include a transceiver 926 coupled to processor 922 and capable of wirelessly transmitting and receiving data. In other words, processor 922 may transceive the data such as configuration, message, signal, information, indicator, etc. via transceiver 926. In some implementations, network apparatus 920 may further include a memory 924 coupled to processor 922 and capable of being accessed by processor 922 and storing data therein. Accordingly, communication apparatus 910 and network apparatus 920 may wirelessly communicate with each other via transceiver 916 and transceiver 926, respectively. To aid better understanding, the following description of the operations, functionalities and capabilities of each of communication apparatus 910 and network apparatus 920 is provided in the context of a mobile communication environment in which communication apparatus 910 is implemented in or as a communication apparatus or a UE and network apparatus 920 is implemented in or as a network node of a communication network.
[0062] In some implementations, each of memory 914 and memory 924 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of memory 914 and memory 924 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of memory 914 and memory 924 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory. Illustrative Processes
[0063] FIG. 10 illustrates an example process 1000 in accordance with an implementation of the present disclosure. Process 1000 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to processing SSB of the present disclosure. Process 1000 may represent an aspect of implementation of features of communication apparatus 910. Process 1000 may include one or more operations, actions, or functions as illustrated by one or more of blocks 1010 and 1020. Although illustrated as discrete blocks, various blocks of process 1000 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 1000 may be executed in the order shown in FIG. 10 or, alternatively, in a different order. Process 1000 may be implemented by communication apparatus 910 or any suitable UE or machine type devices. Solely for illustrative purposes and without limitation, process 1000 is described below in the context of communication apparatus 910. Process 1000 may begin at block 1010.
[0064] At block 1010, process 1000 may involve processor 912 of communication apparatus 910 receiving, via transceiver 916, an SSB. The SSB may include a PBCH and exclude PSS and SSS. Process 1000 may proceed from block 1010 to block 1020.
[0065] At block 1020, process 1000 may involve processor 912 of communication apparatus 910 processing the SSB to perform time-domain synchronization based on the PBCH.
[0066] In some implementations, the PBCH may be carried by at least one two-symbol PBCH burst.
[0067] In some implementations, each two-symbol PBCH burst may include a first PBCH symbol and a second PBCH symbol, and RBs in the second PBCH symbol may correspond to RBs in the first PBCH symbol with a frequency-domain phase ramping applied.
[0068] In some implementations, the frequency-domain phase ramping may be applied to the second PBCH symbol based on an OFDM CP length.
[0069] In some implementations, the frequency-domain phase ramping may result in a cyclic time-domain shift of narrowband PBCH samples corresponding to the second PBCH symbol by the OFDM CP length.
[0070] In some implementations, a number of RBs corresponding to each two-symbol PBCH burst may be associated with a carrier bandwidth.
[0071] In some implementations, an RB corresponding to the PBCH may include a plurality of data REs and a plurality of pilot REs, and the plurality of pilot REs may be used as at least one of SSS and DMRS.
[0072] In some implementations, the pilot REs may be used to perform at least one of: (1) identifying a physical cell identification, and (2) PBCH channel and noise estimation.
[0073] In some implementations, during a slot including the PBCH, data may be received on all RBs within the SSB.
[0074] In some implementations, the SSB and payload of the data may use the same spatial beam.
[0075] In some implementations, the data may include at least one of system information, paging information and randomly generated QPSK channel symbols.
[0076] In some implementations, a PBCH channel rate matching may be performed based on one half of a total number of channel bits that the PBCH is capable of carrying.
[0077] FIG. 11 illustrates an example process 1100 in accordance with an implementation of the present disclosure. Process 1100 may be an example implementation of above scenarios / schemes, whether partially or completely, with respect to processing SSB of the present disclosure. Process 1100 may represent an aspect of implementation of features of network apparatus 920. Process 1100 may include one or more operations, actions, or functions as illustrated by one or more of blocks 1110 and 1112. Although illustrated as discrete blocks, various blocks of process 1100 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of process 1100 may be executed in the order shown in FIG. 11 or, alternatively, in a different order. Process 1100 may be implemented by network apparatus 920 or any suitable network device or machine type devices. Solely for illustrative purposes and without limitation, process 1100 is described below in the context of network apparatus 920. Process 1100 may begin at block 1110.
[0078] At block 1110, process 1100 may involve processor 922 of network apparatus 920 determining an SSB. The SSB may include a PBCH and exclude PSS and SSS. Process 1100 may proceed from block 1110 to block 1120.
[0079] At block 1120, process 1100 may involve processor 922 of network apparatus 920 transmitting, via transceiver 926, the SSB for performing time-domain synchronization based on the PBCH.
[0080] In some implementations, the PBCH may be carried by at least one two-symbol PBCH burst.
[0081] In some implementations, each two-symbol PBCH burst may include a first PBCH symbol and a second PBCH symbol, and RBs in the second PBCH symbol may correspond to RBs in the first PBCH symbol with a frequency-domain phase ramping applied.
[0082] In some implementations, process 1100 may further involve processor 922 of network apparatus 920 applying a frequency-domain phase ramping to the second PBCH symbol based on an OFDM CP length.
[0083] In some implementations, an RB corresponding to the PBCH may include a plurality of data REs and a plurality of pilot REs, and the plurality of pilot REs may be used as at least one of SSS and DMRS.
[0084] In some implementations, the pilot REs may be used to perform at least one of: (1) identifying a physical cell identification, and (2) PBCH channel and noise estimation.
[0085] In some implementations, during a slot including the PBCH, data may be transmitted on all RBs within the SSB.
[0086] In some implementations, a PBCH channel rate matching may be performed based on one half of a total number of channel bits that the PBCH is capable of carrying. Additional Notes
[0087] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0088] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0089] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a”and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “asystem having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “asystem having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B. ”
[0090] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:receiving, by a processor of an apparatus, a Synchronization Signal Block (SSB) , wherein the SSB includes a Physical Broadcast Channel (PBCH) and excludes Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) ; andprocessing, by the processor, the SSB to perform time-domain synchronization based on the PBCH.2.The method of Claim 1, wherein the PBCH is carried by at least one two-symbol PBCH burst.3.The method of Claim 2, wherein each two-symbol PBCH burst includes a first PBCH symbol and a second PBCH symbol, and Resource Blocks (RBs) in the second PBCH symbol correspond to RBs in the first PBCH symbol with a frequency-domain phase ramping applied.4.The method of Claim 3, wherein the frequency-domain phase ramping is applied to the second PBCH symbol based on an Orthogonal Frequency Division Multiplexing (OFDM) Cyclic Prefix (CP) length.5.The method of Claim 4, wherein the frequency-domain phase ramping results in a cyclic time-domain shift of narrowband PBCH samples corresponding to the second PBCH symbol by the OFDM CP length.6.The method of Claim 2, wherein a number of Resource Blocks (RBs) corresponding to each two-symbol PBCH burst is associated with a carrier bandwidth.7.The method of Claim 2, wherein a Resource Block (RB) corresponding to the PBCH includes a plurality of data Resource Elements (REs) and a plurality of pilot REs, and the plurality of pilot REs are used as at least one of SSS and Demodulation Reference Signal (DMRS) .8.The method of Claim 7, wherein the pilot REs are used to perform at least one of:identifying a physical cell identification, andPBCH channel and noise estimation.9.The method of Claim 1, wherein, during a slot including the PBCH, data is received on all Resource Blocks (RBs) within the SSB.10.The method of Claim 9, wherein the SSB and payload of the data use the same spatial beam.11.The method of Claim 9, wherein the data includes at least one of system information, paging information and randomly generated Quadrature Phase Shift Keying (QPSK) channel symbols.12.The method of Claim 1, wherein a PBCH channel rate matching is performed based on one half of a total number of channel bits that the PBCH is capable of carrying.13.A method, comprising:determining, by a processor of an apparatus, a Synchronization Signal Block (SSB) , wherein the SSB includes a Physical Broadcast Channel (PBCH) and excludes Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) ; andtransmitting, by the processor, the SSB for performing time-domain synchronization based on the PBCH.14.The method of Claim 13, wherein the PBCH is carried by at least one two-symbol PBCH burst.15.The method of Claim 14, wherein each two-symbol PBCH burst includes a first PBCH symbol and a second PBCH symbol, and Resource Blocks (RBs) in the second PBCH symbol correspond to RBs in the first PBCH symbol with a frequency-domain phase ramping applied.16.The method of Claim 15, further comprising:applying, by the processor, a frequency-domain phase ramping to the second PBCH symbol based on an Orthogonal Frequency Division Multiplexing (OFDM) Cyclic Prefix (CP) length.17.The method of Claim 14, wherein a Resource Block (RB) corresponding to the PBCH includes a plurality of data Resource Elements (REs) and a plurality of pilot REs, and the plurality of pilot REs are used as at least one of SSS and Demodulation Reference Signal (DMRS) .18.The method of Claim 17, wherein the pilot REs are used to perform at least one of:identifying a physical cell identification, andPBCH channel and noise estimation.19.The method of Claim 13, wherein, during a slot including the PBCH, data is transmitted on all Resource Blocks (RBs) within the SSB.20.The method of Claim 13, wherein a PBCH channel rate matching is performed based on one half of a total number of channel bits that the PBCH is capable of carrying.21.An apparatus implementable in a user equipment (UE) , comprising:a transceiver configured to communicate wirelessly; anda processor coupled to the transceiver and configured to perform, via the transceiver, operations comprising:receiving, via the transceiver, a Synchronization Signal Block (SSB) , wherein the SSB includes a Physical Broadcast Channel (PBCH) and excludes Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) ; andprocessing the SSB to perform time-domain synchronization based on the PBCH.