WO2021221468A1 - Procédé et appareil de transmission de signal de liaison descendante pour un accès initial dans un système de communication sans fil - Google Patents

Procédé et appareil de transmission de signal de liaison descendante pour un accès initial dans un système de communication sans fil Download PDF

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Publication number
WO2021221468A1
WO2021221468A1 PCT/KR2021/005396 KR2021005396W WO2021221468A1 WO 2021221468 A1 WO2021221468 A1 WO 2021221468A1 KR 2021005396 W KR2021005396 W KR 2021005396W WO 2021221468 A1 WO2021221468 A1 WO 2021221468A1
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WIPO (PCT)
Prior art keywords
synchronization signal
signal
pbch
synchronization
sss
Prior art date
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PCT/KR2021/005396
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English (en)
Inventor
Qiaoyang Ye
Jeongho Jeon
Shuang TIAN
Joonyoung Cho
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/125,851 external-priority patent/US20210337494A1/en
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to EP21796991.4A priority Critical patent/EP4115544A4/fr
Priority to CN202180031939.2A priority patent/CN115462011A/zh
Publication of WO2021221468A1 publication Critical patent/WO2021221468A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0076—Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present disclosure relates generally to downlink (DL) signal/channel design for initial access for high frequency band communications.
  • the 5G/NR or pre-5G/NR communication system is also called a "beyond 4G network" or a "post LTE system.”
  • the 5G/NR communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 28 giga-Hertz (GHz) or 60GHz bands, so as to accomplish higher data rates or in lower frequency bands, such as 6GHz, to enable robust coverage and mobility support.
  • mmWave e.g., 28 giga-Hertz (GHz) or 60GHz bands
  • the beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G/NR communication systems.
  • RANs cloud radio access networks
  • D2D device-to-device
  • wireless backhaul moving network
  • CoMP coordinated multi-points
  • 5G 5th-generation
  • connected things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment.
  • Mobile devices are expected to evolve in various form-factors, such as augmented reality glasses, virtual reality headsets, and hologram devices.
  • 6G communication systems are referred to as beyond-5G systems.
  • 6G communication systems which are expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga)-level bps and a radio latency less than 100 ⁇ sec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof.
  • a full-duplex technology for enabling an uplink transmission and a downlink transmission to simultaneously use the same frequency resource at the same time
  • a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner
  • HAPS high-altitude platform stations
  • an improved network structure for supporting mobile base stations and the like and enabling network operation optimization and automation and the like
  • a dynamic spectrum sharing technology via collison avoidance based on a prediction of spectrum usage an use of artificial intelligence (AI) in wireless communication for improvement of overall network operation by utilizing AI from a designing phase for developing 6G and internalizing end-to-end AI support functions
  • a next-generation distributed computing technology for overcoming the limit of UE computing ability through reachable super-high-performance communication and computing resources (such as mobile edge computing (MEC), clouds, and the like) over the network.
  • MEC mobile edge computing
  • 6G communication systems in hyper-connectivity, including person to machine (P2M) as well as machine to machine (M2M), will allow the next hyper-connected experience.
  • services such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica could be provided through 6G communication systems.
  • services such as remote surgery for security and reliability enhancement, industrial automation, and emergency response will be provided through the 6G communication system such that the technologies could be applied in various fields such as industry, medical care, automobiles, and home appliances.
  • 5G systems and technologies associated therewith is for reference as certain embodiments of the present disclosure may be implemented in 5G systems, 6 th Generation (6G) systems, or even later releases which may use terahertz (THz) bands.
  • 6G 6 th Generation
  • THz terahertz
  • the present disclosure is not limited to any particular class of systems or the frequency bands associated therewith, and embodiments of the present disclosure may be utilized in connection with any frequency band.
  • aspects of the present disclosure may also be applied to deployment of 5G communication systems, 6G communications systems, or communications using THz bands.
  • a synchronization signal block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) may be transmitted using first and second beams.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • One or more symbols adjoining the first and second synchronization signals may be configured to accommodate a beam switching time.
  • Embodiments of the disclosure provide beam index indication and guard time for beam switching for DL signal/channel for initial access and DL signal/channel design for initial access that enables efficient beam acquisition and provides good coverage and detection performance.
  • a synchronization signal block including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) is transmitted using first and second beams.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • One or more symbols adjoining the first and second synchronization signals are configured to accommodate a beam switching time.
  • At least one signal indicates a beam index for the first beam transmitting the first synchronization signal, and the beam index for the second beam transmitting the second synchronization signal is either signaled or determined based on a predetermined relationship between a resource for the first synchronization signal and a resource for the second synchronization signal.
  • the beam indices may comprise first and second numbers of bits and/or may be jointly encoded.
  • the beam indices may be indicated by one of the PSS, the SSS, the PBCH, a demodulation reference signal (DMRS), or a synchronization or reference signal designated for that purpose.
  • FIG. 1 illustrates an exemplary networked system according to various embodiments of this disclosure
  • FIG. 2 illustrates an exemplary base station (BS) according to various embodiments of this disclosure
  • FIG. 3 illustrates an exemplary electronic device for communicating in the networked computing system according to various embodiments of this disclosure
  • FIG. 4 illustrates the structure of a synchronization signal block according to various embodiments of this disclosure
  • FIG. 5 illustrates the structure of a synchronization signal block burst according to various embodiments of this disclosure
  • FIG. 6 illustrates a flowchart for an example of SS block generation and transmission according to embodiments of the present disclosure
  • FIG. 7 illustrates a flowchart for an example of SS reception according to embodiments of the present disclosure
  • FIGS. 8A and 8B illustrate beam forming for a PSS, an SSS, and/or a PBCH according to various embodiments of this disclosure
  • FIG. 9 illustrates an exemplary transmission scheme for a PSS, an SSS, and/or a PBCH according to various embodiments of this disclosure
  • FIG. 10 illustrates a flowchart for an example of beam index determination and SS generation according to embodiments of the present disclosure
  • FIG. 11 illustrates a flowchart for an example of beam index detection according to embodiments of the present disclosure
  • FIG. 12 illustrates a flowchart for an example of beam index determination and SS generation according to embodiments of the present disclosure
  • FIG. 13 illustrates a flowchart for an example of PSS, SSS, and/or PBCH reception and beam index detection according to embodiments of the present disclosure
  • FIG. 14 illustrates a flowchart for an example of transmission beam switching during guard time according to embodiments of the present disclosure
  • FIG. 15 illustrates an example of a guard time according to embodiments of the present disclosure
  • FIGS. 16A, 16B and 16C illustrate examples of a guard time according to embodiments of the present disclosure
  • FIG. 17 illustrates a flowchart for an example of reception of a DL signal/channel for initial access according to embodiments of the present disclosure
  • FIGS. 18A-18B illustrate examples of time domain repetition for a synchronization signal suitable for the process illustrated by FIG. 6;
  • FIG. 19 illustrates a flowchart for an example of UE detection of a DL signal/channel with repetitions according to embodiments of the present disclosure
  • FIGS. 20A-20E are diagrams illustrating some examples of the multiplexing methods for PSS, SSS and PBCH for the process illustrated by FIG. 6;
  • FIGS. 21A-21I illustrate are diagrams illustrating some examples of the multiplexing methods for PSS, SSS and PBCH with repetition for the process illustrated by FIG. 6;
  • FIG. 22 illustrates a flowchart for an example of generation and transmission for DL signal/channel for initial access according to embodiments of the present disclosure
  • FIG. 23 illustrates an example of a burst set of the DL signal/channel for initial access according to embodiments of the present disclosure
  • FIG. 24 illustrates an example of a burst set of DL signal/channel for initial access according to embodiments of the present disclosure.
  • FIG. 25 illustrates a flowchart for an example of UE detection of the DL signal/channel for initial access according to embodiments of the present disclosure.
  • Embodiments within this disclosure relate to electronic devices and methods on DL signal/channel design for initial access for high frequency band (e.g. THz band) communication, more particularly, to electronic devices and methods on DL signal/channel design for initial access that enable efficient beam acquisition and provide good coverage and detection performance.
  • high frequency band e.g. THz band
  • a set of synchronization signals including first and second synchronization signals may be generated.
  • the first synchronization signal may be transmitted using a first beam
  • the second synchronization signal is transmitted using a second beam.
  • At least one signal indicates a beam index for the first beam transmitting the first synchronization signal
  • one or more symbols adjoining the first and second synchronization signals may be configured to accommodate a beam switching time for switching between the first beam and the second beam.
  • the set of synchronization signals may include a synchronization signal block (SSB), the first synchronization signal may be a primary synchronization signal (PSS) and the second synchronization signal may be a secondary synchronization signal (SSS), and the synchronization signal block may include a physical broadcast channel (PBCH).
  • SSB synchronization signal block
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • different numbers of repetitions may be applied to one or more of the PSS, the SSS, and the PBCH.
  • multiple transmissions of the SSS or the PBCH, each containing different information, may be associated with one PSS.
  • quasi co-location may be not assumed for the transmission of the PSS and transmissions of the SSS or the PBCH.
  • either the at least one signal may indicate a beam index for the second beam transmitting the second synchronization signal, or the beam index for the second synchronization signal may be determined based on a predetermined relationship between a resource for transmission of the first synchronization signal and a resource for the second synchronization signal.
  • the beam index for the first synchronization signal may include a first number of bits and a beam index for the second synchronization signal may include a second number of bits, and/or the beam index for the first synchronization signal and a beam index for the second synchronization signal may be jointly encoded.
  • the at least one signal or channel indicating the beam index for the first synchronization signal can be one of the PSS, the SSS, the PBCH, a demodulation reference signal (DMRS), or a synchronization or reference signal designated for indicating the beam index for the first synchronization signal.
  • the signal or channel can be one of the PSS, the SSS, the PBCH, a demodulation reference signal (DMRS), or a synchronization or reference signal designated for indicating the beam index for the first synchronization signal.
  • DMRS demodulation reference signal
  • the one or more symbols adjoining the synchronization signals or channels that use different transmission beams may be reserved to accommodate the beam switching time, punctured to accommodate the beam switching time, or reserved for a first region and punctured for a second region.
  • the PSS, the SSS, and the PBCH may be multiplexed in one of a time domain and a frequency domain, with different numbers of repetitions applied to one or more of the PSS, the SSS, and the PBCH.
  • Multiple transmissions of the SSS or the PBCH, each containing different information, may be associated with one PSS, and quasi co-location (QCL) is not assumed for the transmission of the PSS and transmissions of the SSS or the PBCH.
  • the first beam may be one of a first plurality of beams within a sector of a coverage area and the second beam may be one of a second plurality of beams within the sector, and wherein the first beam may cover more of the sector than the second beam.
  • an apparatus comprising a controller configured to generate a set of synchronization signals including first and second synchronization signals; and a transceiver.
  • the transceiver may be configured to transmit the first synchronization signal using a first beam, and transmit the second synchronization signal using a second beam.
  • At least one signal may indicate a beam index for the first beam transmitting the first synchronization signal.
  • One or more symbols adjoining the first and second synchronization signals may be configured to accommodate a beam switching time for switching between the first beam and the second beam.
  • an apparatus comprising a processor and a transceiver coupled to the processor.
  • the transceiver may be configured to receive a set of synchronization signals including first and second synchronization signals, wherein the first synchronization signal is received using a first beam and the second synchronization signal is received using a second beam.
  • At least one signal may indicate a beam index for the first beam transmitting the first synchronization signal, and one or more symbols adjoining the first and second synchronization signals may be configured to accommodate a beam switching time for switching between the first beam and the second beam.
  • Couple and its derivatives refer to any direct or indirect communication between two or more elements, whether those elements are in physical contact with one another.
  • the term “or” is inclusive, meaning and/or.
  • controller means any device, system or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.
  • phrases "at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed.
  • “at least one of: A, B, and C” includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.
  • the term “set” means one or more. Accordingly, a set of items can be a single item or a collection of two or more items.
  • various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium.
  • application and “program” refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code.
  • computer readable program code includes any type of computer code, including source code, object code, and executable code.
  • computer readable medium includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory.
  • ROM read only memory
  • RAM random access memory
  • CD compact disc
  • DVD digital video disc
  • a "non-transitory” computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals.
  • a non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.
  • High frequency band e.g., TeraHertz (THz) band communication
  • THz band which generally refers to band with range of 0.1 THz - 10 THz.
  • the very wide available bandwidth in high frequency band offers new, exciting opportunities for enabling extremely high throughput, e.g. in unit of Tera bits per second (Tbps).
  • the carrier frequency offset (CFO) is much larger than conventional cellular systems, due to high carrier frequency.
  • the orthogonal frequency division multiplexing (OFDM) waveform is considered as the baseline for high frequency communication system.
  • larger subcarrier spacing can be preferred.
  • power amplifier (PA) efficiency issues become more critical in high frequency band system, and waveform with low PAPR can be preferred.
  • PA power amplifier
  • the shortened symbol duration due to large subcarrier spacing necessitates the design for high frequency band communication to compensate the coverage and detection performance loss.
  • FIG. 1 illustrates an exemplary networked system according to various embodiments of this disclosure.
  • the embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 could be used without departing from the scope of this disclosure.
  • the wireless network 100 includes a base station (BS) 101, a BS 102, and a BS 103.
  • the BS 101 communicates with the BS 102 and the BS 103.
  • the BS 101 also communicates with at least one Internet protocol (IP) network 130, such as the Internet, a proprietary IP network, or another data network.
  • IP Internet protocol
  • the BS 102 provides wireless broadband access to the network 130 for a first plurality of user equipments (UEs) within a coverage area 120 of the BS 102.
  • the first plurality of UEs includes a UE 111, which may be located in a small business; a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi hotspot (HS); a UE 114, which may be located in a first residence (R1); a UE 115, which may be located in a second residence (R2); and a UE 116, which may be a mobile device (M) like a cell phone, a wireless laptop, a wireless PDA, or the like.
  • M mobile device
  • the BS 103 provides wireless broadband access to the network 130 for a second plurality of UEs within a coverage area 125 of the BS 103.
  • the second plurality of UEs includes the UE 115 and the UE 116.
  • one or more of the BSs 101-103 may communicate with each other and with the UEs 111-116 using 5G, LTE, LTE Advanced (LTE-A), WiMAX, WiFi, or other wireless communication techniques.
  • base station or “BS,” such as node B, evolved node B (“eNodeB” or “eNB”), a 5G node B (“gNodeB” or “gNB”) or “access point.”
  • BS base station
  • node B evolved node B
  • eNodeB evolved node B
  • gNodeB 5G node B
  • access point access point
  • UE user equipment
  • MS mobile station
  • SS subscriber station
  • UE remote wireless equipment
  • wireless terminal wireless terminal
  • Dotted lines show the approximate extent of the coverage areas 120 and 125, which are shown as approximately circular for the purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with BSs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending upon the configuration of the BSs and variations in the radio environment associated with natural and man-made obstructions.
  • FIG. 1 illustrates one example of a wireless network 100
  • the wireless network 100 could include any number of BSs and any number of UEs in any suitable arrangement.
  • the BS 101 could communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130.
  • each BS 102-103 could communicate directly with the network 130 and provide UEs with direct wireless broadband access to the network 130.
  • the BS 101, 102, and/or 103 could provide access to other or additional external networks, such as external telephone networks or other types of data networks.
  • FIG. 2 illustrates an exemplary base station (BS) according to various embodiments of this disclosure.
  • the embodiment of the BS 102 illustrated in FIG. 2 is for illustration only, and the BSs 101 and 103 of FIG. 1 could have the same or similar configuration.
  • BSs come in a wide variety of configurations, and FIG. 2 does not limit the scope of this disclosure to any particular implementation of a BS.
  • the BS 102 includes multiple antennas 280a-280n, multiple radio frequency (RF) transceivers 282a-282n, transmit (TX or Tx) processing circuitry 284, and receive (RX or Rx) processing circuitry 286.
  • the BS 102 also includes a controller/processor 288, a memory 290, and a backhaul or network interface 292.
  • the RF transceivers 282a-282n receive, from the antennas 280a-280n, incoming RF signals, such as signals transmitted by UEs in the network 100.
  • the RF transceivers 282a-282n down-convert the incoming RF signals to generate IF or baseband signals.
  • the IF or baseband signals are sent to the RX processing circuitry 286, which generates processed baseband signals by filtering, decoding, and/or digitizing the baseband or IF signals.
  • the RX processing circuitry 286 transmits the processed baseband signals to the controller/processor 288 for further processing.
  • the TX processing circuitry 284 receives analog or digital data (such as voice data, web data, e-mail, or interactive video game data) from the controller/processor 288.
  • the TX processing circuitry 284 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate processed baseband or IF signals.
  • the RF transceivers 282a-282n receive the outgoing processed baseband or IF signals from the TX processing circuitry 284 and up-converts the baseband or IF signals to RF signals that are transmitted via the antennas 280a-280n.
  • the controller/processor 288 can include one or more processors or other processing devices that control the overall operation of the BS 102.
  • the controller/ processor 288 could control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 282a-282n, the RX processing circuitry 286, and the TX processing circuitry 284 in accordance with well-known principles.
  • the controller/processor 288 could support additional functions as well, such as more advanced wireless communication functions and/or processes described in further detail below.
  • the controller/processor 288 could support beam forming or directional routing operations in which outgoing signals from multiple antennas 280a-280n are weighted differently to effectively steer the outgoing signals in a desired direction. Any of a wide variety of other functions could be supported in the BS 102 by the controller/processor 288.
  • the controller/processor 288 includes at least one microprocessor or microcontroller.
  • the controller/processor 288 is also capable of executing programs and other processes resident in the memory 290, such as a basic operating system (OS).
  • OS basic operating system
  • the controller/processor 288 can move data into or out of the memory 290 as required by an executing process.
  • the controller/processor 288 is also coupled to the backhaul or network interface 292.
  • the backhaul or network interface 292 allows the BS 102 to communicate with other devices or systems over a backhaul connection or over a network.
  • the interface 292 could support communications over any suitable wired or wireless connection(s).
  • the interface 292 could allow the BS 102 to communicate with other BSs over a wired or wireless backhaul connection.
  • the interface 292 could allow the BS 102 to communicate over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet).
  • the interface 292 includes any suitable structure supporting communications over a wired or wireless connection, such as an Ethernet or RF transceiver.
  • the memory 290 is coupled to the controller/processor 288. Part of the memory 290 could include a RAM, and another part of the memory 290 could include a Flash memory or other ROM.
  • base stations in a networked computing system can be assigned as synchronization source BS or a slave BS based on interference relationships with other neighboring BSs.
  • the assignment can be provided by a shared spectrum manager.
  • the assignment can be agreed upon by the BSs in the networked computing system. Synchronization source BSs transmit OSS to slave BSs for establishing transmission timing of the slave BSs.
  • FIG. 2 illustrates one example of BS 102
  • the BS 102 could include any number of each component shown in FIG. 2.
  • an access point could include a number of interfaces 292, and the controller/processor 288 could support routing functions to route data between different network addresses.
  • the gNB 102 while shown as including a single instance of TX processing circuitry 284 and a single instance of RX processing circuitry 286, the gNB 102 could include multiple instances of each (such as one per RF transceiver).
  • various components in FIG. 2 could be combined, further subdivided, or omitted and additional components could be added according to particular needs.
  • FIG. 3 illustrates an exemplary electronic device for communicating in the networked computing system according to various embodiments of this disclosure.
  • the electronic device 300 is a user equipment implemented as a mobile device, which can represent one of the UEs in FIG. 1.
  • the electronic device 300 includes a bus system 305, which supports communication between at least one processing device 310, at least one storage device 315, at least one communications unit 320, and at least one input/output (I/O) unit 325.
  • a bus system 305 which supports communication between at least one processing device 310, at least one storage device 315, at least one communications unit 320, and at least one input/output (I/O) unit 325.
  • the processing device 310 executes instructions that may be loaded into a memory 330.
  • the processing device 310 may include any suitable number(s) and type(s) of processors or other devices in any suitable arrangement.
  • Example types of processing devices 310 include microprocessors, microcontrollers, digital signal processors, field programmable gate arrays, application specific integrated circuits, and discrete circuitry.
  • the memory 330 and a persistent storage 335 are examples of storage devices 315, which represent any structure(s) capable of storing and facilitating retrieval of information (such as data, program code, and/or other suitable information on a temporary or permanent basis).
  • the memory 330 may represent a random access memory or any other suitable volatile or non-volatile storage device(s).
  • the persistent storage 335 may contain one or more components or devices supporting longer-term storage of data, such as a read only memory, hard drive, Flash memory, or optical disc.
  • the communications unit 320 supports communications with other systems or devices.
  • the communications unit 320 could include a network interface card or a wireless transceiver facilitating communications over the network 130.
  • the communications unit 320 may support communications through any suitable physical or wireless communication link(s).
  • the I/O unit 325 allows for input and output of data.
  • the I/O unit 325 may provide a connection for user input through a keyboard, mouse, keypad, touchscreen, or other suitable input device.
  • the I/O unit 325 may also send output to a display, printer, or other suitable output device.
  • the electronic device 300 can serve as a shared spectrum manager in a networked computing system can generate synchronization source/slave assignments and configure synchronization signals.
  • FIG. 3 illustrates an example of an electronic device 300 in a wireless system including a plurality of base stations, such as base stations 101, 102, and 103 in FIG. 1, various changes may be made to FIG. 3.
  • various components in FIG. 3 can be combined, further subdivided, or omitted and additional components could be added according to particular needs.
  • servers can come in a wide variety of configurations, and FIG. 3 does not limit this disclosure to any particular electronic device.
  • FIG. 4 illustrates the structure of a synchronization signal block according to various embodiments of this disclosure.
  • the initial access in 3 rd Generation Partnership Project (3GPP) NR systems is based on the so-called synchronization signal block (SSB), which includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH).
  • SSB synchronization signal block
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • PSS 401 and SSS 402 occupy 127 subcarriers in the frequency domain, and are transmitted in the first and third symbols of the SSB, respectively.
  • PBCH 403 is transmitted on the second and fourth symbols of the SSB, occupying 240 subcarriers.
  • PBCH 403 is transmitted on the third symbol of SSB, occupying 48 subcarriers at each side of the SSS.
  • FIG. 5 illustrates the structure of a synchronization signal block burst according to various embodiments of this disclosure.
  • a synchronization signal (SS) burst set is defined in NR.
  • different SSBs can be transmitted in different beams in a time division multiplexing (TDM) fashion, i.e. beam-sweeping for SSB.
  • TDM time division multiplexing
  • the SS burst set can be transmitted periodically, with a default periodicity of 20 milliseconds (ms) for initial cell search.
  • ms milliseconds
  • the duration for cell detection and beam selection for NR systems is quite large, as multiple SS burst set transmission periods need to be combined for synchronization, cell identifier (ID) detection, SSB measurement. and SSB index detection [38.133].
  • DL signal/channel design for the high frequency band communication initial access to reduce the initial access latency is preferred.
  • the high frequency band communication systems operate in much higher frequency range. Narrower beams are considered for the high frequency band communication systems, which results in larger number of transmit-receiver beam pairs to be selected.
  • symbol duration for the high frequency band communication system would be much smaller than 3GPP NR system, consider the vast amount of available spectrum in the high frequency band communication band, the impact of large CFO and PAPR.
  • a device may perform one or more of synchronization, cell ID detection, measurement or beam-sweeping, based on which the device camps on a cell and selects the preferred transmit and receive beams for DL transmission.
  • the high frequency band system may have considerable number of beams for highly direction transmission, which results in high complexity in beam acquisition. This motivates DL signal/channel design enabling efficient beam-sweeping and acquisition mechanism for initial access in high frequency band communication systems.
  • indication e.g., beam index
  • transmission schemes involve problems to be solved.
  • the present disclosure enables efficient initial beam acquisition and initial access for wireless communication systems (e.g. in high frequency band).
  • the disclosure relates to design of a DL signal/channel for initial access that enables multi-stage beam search. Specifically, beam index indication and for transmission with consideration for the time needed for beam switching, to support multi-stage beam search, is disclosed.
  • the disclosure relates to design of a DL signal/channel for initial access that enables multi-stage beam acquisition.
  • the disclosed design supports transmission of a first synchronization signal, and a second synchronization signal and/or system information (e.g., PBCH) multiplexed in time and/or frequency manner and in different transmission beams, e.g. the first synchronization signal in wide beams associated with multiple second synchronization signals and/or system information (e.g., PBCH) transmissions in narrow beams.
  • PBCH system information
  • Synchronization and initial beam acquisition can be accomplished by a DL signal/channel designed for initial access.
  • a DL signal/channel is called a synchronization signal block (SSB), following the name used for NR systems.
  • SSB synchronization signal block
  • the SSB design can be used for various systems, including a system with high frequency band and OFDM waveform.
  • the DL signal/channel for initial access can include one or more of synchronization signals such as first synchronization signals (also called PSS) or second synchronization signals (also called SSS), or channels carrying system information such as PBCH.
  • PSS can be used for synchronization, and can include partial cell ID information and/or index of the current PSS transmission
  • SSS can include partial cell ID information and/or index of the current DL signal/channel transmission
  • PBCH can include some essential system information such as system frame number (SFN), configuration for transmission of remaining minimum system information, etc.
  • SFN system frame number
  • FIG. 6 illustrates a flowchart for an example of SS block generation and transmission according to embodiments of the present disclosure.
  • the method 600 depicted in FIG. 6 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • a BS may generate a first synchronization signal (e.g., PSS) for an SSB.
  • the generated synchronization signal may be mapped to predefined resource elements for the SSB.
  • the first synchronization signal can be multiplexed with at least another synchronization signal (e.g., SSS) or system information (e.g., PBCH) in time and/or frequency domain.
  • the first synchronization signal and second synchronization signal can possibly use different transmission beams.
  • the generated SSB may be transmitted at predefined resources. The transmission can be periodic according to a predefined periodicity.
  • FIG. 7 illustrates a flowchart for an example of SS reception according to embodiments of the present disclosure.
  • the method 700 depicted in FIG. 7 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the UE may receive a first synchronization signal (e.g. PSS), which is transmitted at a predefined resource.
  • a first synchronization signal e.g. PSS
  • the UE may receive at least a second synchronization signal or system information (e.g., PBCH), which is multiplexed with the first synchronization signal in time and/or frequency and possibly using different transmission beam(s) from the first synchronization signal.
  • PSS first synchronization signal
  • PBCH system information
  • FIGS. 8A and 8B illustrate beam forming for a PSS, an SSS, and/or a PBCH according to various embodiments of this disclosure.
  • the example 800 depicted in FIGS. 8A-8B is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the BS 801 may transmit the first synchronization signal (e.g., PSS) in one transmission beam as illustrated in FIG. 8A, on one set of predefined resources, but transmit a second synchronization signal (e.g., SSS) and/or system information (e.g., PBCH) in another transmission beam, which can be different from the beam used for the first synchronization signal, on another set of predefined resources, as illustrated in FIG. 8B.
  • the BS 801 can transmit one of the synchronization signal (e.g., PSS) in different beams, e.g., one or more of beams 811, 812, 813 and 814.
  • Another set of beams e.g., one or more of beams 821, 822, 823, 824, 825, 826, 827 and 828, can be used to transmit another synchronization signal (e.g., SSS) and/or system information (e.g., PBCH).
  • the two set of beams can have different beamwidths.
  • beams 811, 812, 813 and 814 can have wider beamwidth than beams 821, 822, 823, 824, 825, 826, 827 and 828.
  • there can be relationship between the two set of beams For example, the direction of beams 821 and 822 belongs to the direction that can be covered by beam 811.
  • beams 823 and 824 can correspond to beam 812
  • beams 825 and 826 can correspond to beam 813
  • beams 827 and 828 can correspond to beam 814, respectively.
  • FIG. 9 illustrates an exemplary transmission scheme for a PSS, an SSS, and/or a PBCH according to various embodiments of this disclosure.
  • the example 900 depicted in FIG. 9 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • a certain number of the first synchronization signals can be transmitted first using different transmission beams.
  • One or more of the second synchronization signal e.g., SSS
  • system information e.g., PBCH
  • 912 and 914 associated with 902 and 916 and 918 associated with 904 can be transmitted following the transmission of the associated first synchronization signals, using the beams associated with the beams used for the preceding first synchronization signal.
  • the set of these transmissions 932 can be defined as a sub-burst, which can correspond to a subset of transmission beams supported by the cell for the first synchronization signal.
  • a transmission burst 934 may include one or more of sub-bursts corresponding to a subset of transmission beams.
  • the transmission burst 934 may include the transmissions of DL signals/channels using all supported beams.
  • the transmission burst can be transmitted periodically, with periodicity 936.
  • the sub-burst 932 be the same as burst 934.
  • a predefined number of repetitions can be used for one or more first synchronization signals (e.g., 902, 904, 906, 908), second synchronization signals and system information such as PBCH (e.g., 912, 914, 916, 918, 922, 924, 926, 928).
  • PBCH e.g., 912, 914, 916, 918, 922, 924, 926, 928.
  • the resources for transmission of synchronization signals and system information e.g.
  • PBCH PBCH
  • PBCH system information
  • the beam index for one or more of the synchronization signals or system information can be indicated explicitly.
  • FIG. 10 illustrates a flowchart for an example of beam index determination and SS generation according to embodiments of the present disclosure.
  • the method 1000 depicted in FIG. 10 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the BS may determine the beam index for the first synchronization signal.
  • the BS may determine the beam index for the second synchronization signal and/or system information (e.g., PBCH).
  • the beam index information for the first synchronization signal may be inserted to be carried by one or more of the synchronization signals (e.g.,. the first synchronization signal and/or the second synchronization signal), and/or another reference signal, and/or system information (e.g., PBCH).
  • BS can include the indication for the beam index of the first synchronization signal in generation of the first synchronization signal, and/or the second synchronization signal, and/or another reference signal, and/or system information (e.g., PBCH).
  • the indication for the beam index of the second synchronization signal and/or system information may be included in the generation of one or more of the synchronization signals, and/or another reference signal, and/or system information (e.g., PBCH).
  • the BS can include one or more of explicit, implicit, or joint indication of the beam index of the second synchronization signal in generation of the first synchronization signal, and/or the second synchronization signal, and/or another reference signal, and/or system information (e.g., PBCH).
  • system information e.g., PBCH
  • both the beam index for the first synchronization signal and the beam index for the second synchronization signal and/or system information may be explicitly indicated.
  • bits can be used for indication of the first synchronization signal beam index, e.g., , with being the number of beams used for the first synchronization signal transmissions and being the ceiling function, and bits can be used for indication of the beam index or indices for one or more of the second synchronization signal or system information (e.g. PBCH) associated with each first synchronization signal transmission, e.g., , with being the number of beams used for one or more of the second synchronization signal or system information (e.g., PBCH) associated with each first synchronization signal transmission.
  • the second synchronization signal or system information e.g. PBCH
  • the total number of finer (narrower) beam(s) used for one or more of the second synchronization signal or system information (e.g., PBCH) transmission can be .
  • the beam index or indices can be jointly coded by using bits.
  • the beam index indication information can be carried in the first synchronization signal, and/or the second synchronization signal, and/or another reference signal, and/or system information (e.g., PBCH).
  • the first synchronization signal can carry at least part of the beam index information.
  • the cell selects one out of the three depending on the cell ID modulo 3.
  • there can be 3N sequences for PSS where beam index modulo N and cell ID modulo 3 can be jointly used for determination of the PSS sequence, where N can be any predefined integer.
  • the second synchronization signal can carry at least part of the beam index information.
  • more sequences for SSS can be defined.
  • the SSS is generated based on two M-sequences, where one M-sequence has 3 possible sequences and the other has 112 possible sequences.
  • the SSS can be generated based on the same two M-sequences, where one M-sequence can have 3N possible sequences, and the other can have 112 possible sequences, where beam index modulo N and cell ID can be jointly used to determine the SSS sequence.
  • the reference signal for system information e.g., PBCH
  • demodulation e.g., demodulation reference signal or "DMRS”
  • MIB master information block
  • PBCH system information
  • DMRS demodulation reference signal
  • MIB master information block
  • a new synchronization signal or reference signal can be introduced, which can be multiplexed with PSS/SSS/PBCH in time and/or frequency manner, to carry the beam index indication.
  • part of the beam index indication information can be carried in one signal/channel, while the rest of the indication information can be carried in another signal/channel.
  • the first synchronization signal and one or more of the second synchronization signals or system information e.g., PBCH
  • PBCH system information
  • FIG. 11 illustrates a flowchart for an example of beam index detection according to embodiments of the present disclosure.
  • the method 1100 depicted in FIG. 11 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the UE may detect the first synchronization signal from at least one transmission instance.
  • the UE may determine one or more resources and/or beams for reception of the second synchronization signal and/or system information (e.g., PBCH).
  • the UE may determine one or more corresponding resources, and/or beams for detection of the second synchronization signal and/or system information (e.g., PBCH).
  • the UE can perform receive beam sweeping and determine the reception beams for detection of the second synchronization signal and/or system information (e.g., PBCH), based on reception of the first synchronization signal.
  • the potential set of resources for detection of the second synchronization signal and/or system information can be obtained based on predefined relationship between resources for the first synchronization signal and resources for the associated second synchronization signal and/or system information (e.g., PBCH).
  • the UE receives one or more of the second synchronization signal or system information (e.g., PBCH).
  • the UE determines the beam index based on the detection of the first synchronization signal, and/or the second synchronization signal, and/or another reference signal, and/or system information (e.g., PBCH).
  • FIG. 12 illustrates a flowchart for an example of beam index determination and SS generation according to embodiments of the present disclosure.
  • the method 1200 depicted in FIG. 12 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the BS may determine the beam index for the first synchronization signal.
  • the beam index information for the first synchronization signal may be inserted to be carried by one or more of synchronization signals or system information (e.g., PBCH).
  • PBCH system information
  • the beam index for first synchronization signal transmission can be explicitly indicated, e.g., using bits, with being the number of beams used for first synchronization signal transmissions, while the beam index for one or more of the second synchronization signal or system information (e.g., PBCH) transmission is not explicitly indicated.
  • the beam index for one or more of the second synchronization signal or system information can be obtained based on the relationship between the resources for the associated first synchronization signal and resources for the second synchronization signal and/or system information (e.g., PBCH).
  • the beam index indication information can be carried in the first synchronization signal, and/or the second synchronization signal, and/or another reference signal, and/or system information (e.g., PBCH).
  • the reference signal for system information demodulation e.g., DMRS
  • DMRS can be used for carrying the beam index indication.
  • a new reference signal can be introduced, which can be multiplexed with PSS/SSS/PBCH in time and/or frequency manner, to carry the beam index indication.
  • part of the beam index indication information can be carried in one signal/channel, while the rest of the beam index indication information can be carried in another signal/channel.
  • the first synchronization signal and one or more of the second synchronization signal(s) or system information are time/frequency multiplexed, and mapped to predefined resources.
  • the DL signal/channel for initial access is transmitted.
  • the DL signal/channel including one or more of the first synchronization signal or system information (e.g., PBCH) may be transmitted.
  • FIG. 13 illustrates a flowchart for an example of PSS, SSS, and/or PBCH reception and beam index detection according to embodiments of the present disclosure.
  • the method 1300 depicted in FIG. 13 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the UE may detect the first synchronization signal from at least one transmission instance.
  • the UE may determine one or more resources for detection of one or more of the second synchronization signal(s) or system information (e.g., PBCH).
  • the UE can perform receive beam sweeping and determine the reception beams for detection of the second synchronization signal and/or system information (e.g., PBCH), based on reception of the first synchronization signal.
  • the potential set of resources for detection of the second synchronization signal and/or system information can be obtained based on a predefined relationship between resources for the first synchronization signal and resources for the associated second synchronization signal and/or system information (e.g., PBCH).
  • the UE may receive one or more of the second synchronization signals or system information (e.g., PBCH).
  • the UE may determine the beam index for the first synchronization signal based on the detection of the first synchronization signal, and/or the second synchronization signal, and/or another reference signal, and/or system information (e.g., PBCH).
  • the UE may determine the beam index for the second synchronization signal and/or system information (e.g., PBCH) based on the relationship between resources for the associated first synchronization signal and the resources for the corresponding second synchronization signal and/or system information (e.g., PBCH).
  • system information e.g., PBCH
  • the UE can know which one of the second synchronization signal and/or system information (e.g., PBCH) is considered, assuming there are multiple transmissions of the second synchronization signal and/or system information (e.g., PBCH) associated with one of the first synchronization signal.
  • PBCH system information
  • FIG. 14 illustrates a flowchart for an example of transmission beam switching during guard time according to embodiments of the present disclosure.
  • the method 1400 depicted in FIG. 14 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the BS may transmit the first synchronization signal with one or more transmission beams on predefined resources.
  • the BS may determine the guard time for the beam switching. For example, the BS may determine the guard time by reserving empty symbols or puncturing part of transmissions including one or more parts of synchronization signal(s) or system information.
  • the BS may perform the transmission beam switching during the guard time. For example, BS may transmit one or more of the second synchronization signal(s) or system information.
  • FIG. 15 illustrates an example of a guard time according to embodiments of the present disclosure.
  • the example 1500 depicted in FIG. 15 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the guard time can be empty symbols 1501 and/or 1502 reserved by the BS, as show in FIG. 15.
  • the guard time can be different for different transmissions, e.g., a different guard time is reserved between symbols for first synchronization signals and symbols for one or more of the second synchronization signals or system information (e.g., PBCH).
  • FIG. 15 is just an illustrative example. In other examples where different PSS transmissions use different transmission beams, the guard time may be reserved between these PSS transmissions.
  • FIGS. 16A, 16B and 16C illustrate examples of a guard time according to embodiments of the present disclosure.
  • the examples 1600, 1610 and 1620 depicted in FIGS. 16A-16C are for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the guard time can be a partial symbol 1601, 1611 or 1621 punctured by the BS. Some of the symbols or parts of the symbols can be punctured for the beam switching. For example, the last symbol(s) 1601 or the ending part of last symbol before the beam switching can be punctured for the guard time, as illustrated in FIG. 16A. Alternatively, the first symbol(s) 1611 or the starting part of the first symbol for transmission in a next different beam can be punctured for the beam switching, as illustrated in FIG. 16B. In this option, the puncturing operation can be transparent to the receiver. As a special example, if the duration for beam switching is quite short, beam switching can be resolved within the cyclic prefix (CP) duration.
  • CP cyclic prefix
  • symbol puncturing 1621 can be used for beam switching of the first synchronization signal transmission
  • guard symbol 1622 can be inserted between one or more of the second synchronization signal or system information (e.g., PBCH) transmission with different transmit beams, as shown in FIG. 16C.
  • PBCH second synchronization signal or system information
  • FIG. 16C should be considered in an inclusive manner, while other options can be used as well, e.g., symbol puncturing for beam switching between one or more of the second synchronization signal or system information (e.g., PBCH) transmissions, and symbol puncturing for beam switching between the first synchronization signal transmissions.
  • FIG. 17 illustrates a flowchart for an example of reception of a DL signal/channel for initial access according to embodiments of the present disclosure.
  • the method 1700 depicted in FIG. 17 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the UE may detect the first synchronization signal from at least one transmission instance.
  • the UE may determine one or more resources for detection of one or more of the second synchronization signal or system information (e.g., PBCH).
  • the UE can perform receive beam sweeping and determine the reception beams for detection of the second synchronization signal and/or system information (e.g., PBCH), based on reception of the first synchronization signal.
  • the potential set of resources for detection of the second synchronization signal and/or system information can be obtained based on a predefined relationship between resources for the first synchronization signal and resources for the associated second synchronization signal and/or system information (e.g., PBCH).
  • the guard time has been considered in the definition of the resources for the DL signal/channel transmission, i.e., predefined resources will not include the guard time.
  • the UE will receive the DL signal/channels on these predefined resources which take into account the guard time.
  • the guard time for transmission beam switching for the DL signal/channel can be transparent to the UE (e.g., when the guard time duration is a partial symbol), and thus the UE determines the predefined resources and assumes that the BS keeps transmitting the DL signal/channel on the predefined resources.
  • the UE may receive one or more of the second synchronization signal or system information (e.g., PBCH).
  • PBCH second synchronization signal or system information
  • FIGS. 18A and 18B illustrate examples of repeated PSS symbols for the DL signal/channel for initial access according to embodiments of the present disclosure.
  • the examples 1800 and 1810 depicted in FIGS. 18A-18B are for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the first synchronization signal can be repeated at least in one of time and frequency domains.
  • the first synchronization signal can be mapped to the resource elements without repetitions.
  • FIGS. 18A-18B illustrate examples of time domain repetition, where there can be a CP at the beginning of each repeated symbol (FIG. 18A), or there can be no CP between repeated symbols (FIG. 18B), but where the symbol before can be used as a "long" CP.
  • FIG. 19 illustrates a flowchart for an example of UE detection of a DL signal/channel with repetitions according to embodiments of the present disclosure.
  • the method 1900 depicted in FIG. 19 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the UE can perform coherently or non-coherent combining for all transmission instances of the DL signal/channel.
  • the UE can coherently combine the transmissions within a certain time window, which is no larger than the predefined number of repetitions being QCLed or using the same transmission beam.
  • the UE can perform non-coherent combining of the signals/channels.
  • the relationship between transmission beams used for the second synchronization signal and for system information (e.g., PBCH) symbols can be predefined, e.g., the second synchronization signal immediately preceding the system information (e.g., PBCH) symbols use the same transmission beam. Then the UE can use the second synchronization signal for channel estimation for system information (e.g., PBCH) demodulation. In one example, no additional reference signal is added to the symbols carrying system information (e.g., PBCH). In another example, QCL is not assumed for transmissions of the first synchronization signal and transmissions of the second synchronization signal or system information (e.g. PBCH).
  • the transmissions of the first synchronization signal and transmissions of the second synchronization signal or system information may use different transmission beams and would not have QCL assumption.
  • Certain PSS symbols can be defined to be QCLed, and certain transmissions of the second synchronization signal and/or system information (e.g., PBCH) can be defined to be QCLed.
  • FIGS. 20A through 20E illustrate examples of multiplexing for PSS, SSS and PBCH according to embodiments of the present disclosure.
  • the examples 2000, 2010, 2020, 2030 and 2040 depicted in FIGS. 20A-20E are for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • multiplexing for PSS, SSS and PBCH may be TDM and/or FDM.
  • PSS and SSS can be either multiplexed in FDM manner or in TDM manner.
  • PBCH can be multiplexed with PSS/SSS in TDM, FDM, or TDM and FDM manner.
  • the latter case of multiplexing in both TDM and FDM manner is similar to the design in NR system, where PBCH can be transmitted in symbols different from SSS symbols, and additionally multiplexed with SSS in frequency domain on the symbols with SSS transmission.
  • FIGS. 20A-20E are diagrams illustrating some examples of the multiplexing methods for PSS, SSS and PBCH. In the example 2000 of FIG.
  • one or more PSS, SSS and PBCH are multiplexed in TDM manner.
  • frequency bandwidth for the high frequency band communication system may be divided into a series of non-overlapping frequency subcarriers, and different numbers of subcarriers can be allocated for PSS, SSS and/or PBCH transmissions.
  • PSS and SSS/PBCH can be multiplexed in frequency domain.
  • a guard band (GB) can be possibly added between subcarriers allocated for PSS and SSS/PBCH.
  • SSS and PBCH can be multiplexed in frequency domain, while PSS is multiplexed with SSS/PBCH in time domain.
  • FIGS. 21A through 21I illustrate examples of multiplexing for PSS, SSS and PBCH , with repeated PSS, SSS and/or PBCH according to embodiments of the present disclosure.
  • the examples 2100, 2110, 2120, 2130, 2140, 2150, 2160, 2170 and 2180 depicted in FIGS. 21A-21I are for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • FIGS. 21A through 21I illustrate some examples, where FIGS. 21A and 21B correspond to FIG. 20A, FIGS. 21C and 21D correspond to FIG. 20B, FIGS. 21E and 21F correspond to FIG. 20C, FIGS. 21G and 21H correspond to FIG. 20D, and FIG. 21I corresponds to FIG. 20E.
  • FIGS. 21A through 21I are for illustrative purpose, and different numbers of repetitions can be adopted for PSS, SSS and PBCH per transmission of the DL signal/channel for initial access.
  • the numbers of repetitions for PSS, SSS and PBCH can be different, e.g., more repetitions for PSS compared to SSS/PBCH. In one embodiment, there can be multiple numbers of repetitions supported for PSS, SSS and PBCH. For example, systems operating on different frequency bands can adopt different numbers of repetitions for PSS, SSS and PBCH.
  • the number of repetitions for PSS/SSS/PBCH can be predefined. In one example, different number of repetitions for PSS/SSS/PBCH can be predefined for different frequency bands, e.g.
  • N1 repetitions defined for carrier frequency range 1 e.g., ⁇ 3GHz
  • N2 repetitions defined for carrier frequency range 2 e.g., 3-6GHz
  • N3 repetitions defined for carrier frequency range 3 e.g., 6-52.6GHz
  • one or more SSS/PBCH transmissions can be associated to one PSS transmission.
  • the multiple SSS/PBCH transmissions can be repeated transmissions with SSS/PBCH symbols being the same across the multiple transmissions, or alternatively can be multiple SSS/PBCH symbols carrying different information (e.g., different beam indexes), e.g., N SSS/PBCH transmissions with each transmission repeated M times, where N and M can be any integers.
  • the number of SSS/PBCH transmissions associated with one PSS (e.g., parameter N above) and/or the number of repetitions for each SSS/PBCH transmission (e.g., parameter M above) can be predefined, and can be different for different frequency bands.
  • beamforming can be supported for the DL signal/channel for initial access to compensate the high path and penetration losses.
  • FIG. 22 illustrates a flowchart for an example of generation and transmission for DL signal/channel for initial access according to embodiments of the present disclosure.
  • the method 2200 depicted in FIG. 22 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the BS may generate a synchronization signal.
  • the BS may generate a first synchronization signal.
  • the synchronization signal may be multiplexed with at least one other synchronization signal, as described above.
  • the first synchronization signal can be multiplexed with one or more of second synchronization signal(s) or system information (e.g., PBCH).
  • the BS may transmit the first synchronization signal using one or more transmission beams on predefined resources.
  • the BS may transmit the second synchronization signal using one or more other transmission beams, which can be different from the transmission beams used for the first synchronization signal, on another set of predefined resources.
  • the transmission of one or more of the synchronization signals or system information can be periodic.
  • different periodicities can be adopted for different synchronization signals and system information (e.g., PBCH).
  • different periodicities can be adopted for different frequency bands.
  • the predefined resource for the first synchronization signal transmission at operation 2203 using one transmission beam can be followed by resources for transmission of one or more other signals/channels in the SSB, e.g., the second synchronization signals and/or system information (e.g., PBCH), using transmission beams associated to the beam used for the first synchronization signal (e.g., one of beam pairs ⁇ 821, 822 ⁇ , ⁇ 823, 824 ⁇ , ⁇ 825, 826 ⁇ , ⁇ 827, 828 ⁇ respectively in FIG. 8B).
  • the second synchronization signals and/or system information e.g., PBCH
  • FIG. 23 illustrates an example of a burst set of the DL signal/channel for initial access according to embodiments of the present disclosure.
  • the example 2300 depicted in FIG. 23 is suitable for use with the process 2200 of FIG. 22, but is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • FIG. 23 illustrates an example of the transmission scheme described above in connection with FIG. 22, where one resource set 2301 is configured for beam #i for the PSS, followed by resources 2302 and 2303 for at least one transmission of other signals/channels in SSB (e.g., SSS/PBCH) in beams associated to beam #i.
  • SSB e.g., SSS/PBCH
  • the beam used in adjacent to the PSS transmissions, or adjacent transmissions of other signals/channels in SSB may not be adjacent to one another.
  • the set of DL signal/channel transmission corresponding to all possible beams is defined as a transmission burst 2310, while the periodicity of each PSS transmission is defined as transmission burst periodicity 2320.
  • Predefined numbers of repetitions can be used for one or more of the first synchronization signals 2031, the second synchronization signals or system information (e.g., PBCH) 2302 and 2304.
  • FIG. 24 illustrates an example of a burst set of DL signal/channel for initial access according to embodiments of the present disclosure.
  • the example 2400 depicted in FIG. 24 is suitable for use with the process 2200 of FIG. 22, but is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • At least two instances of the first synchronization signal can be transmitted first, using different transmission beams.
  • One or more of the other signals/channels in the SSB e.g., the second synchronization signal or system information such as PBCH
  • the second synchronization signal or system information such as PBCH can be transmitted using beams associated with the beams used for the preceding first synchronization signal and following the resources for the first synchronization signal.
  • the set of these transmissions 2413 can be defined as a sub-burst, which can correspond to a subset of transmission beams supported by the cell for the first synchronization signal.
  • a transmission burst 2414 includes one or more sub-bursts corresponding to a subset of transmission beams.
  • the transmission burst 2414 includes the transmissions of DL signals/channels using all supported beams.
  • the transmission burst can be transmitted periodically, with periodicity 2415.
  • the sub-burst 2413 be one part of burst 2414; alternatively, the sub-burst 2413 can be the same as burst 2414.
  • Predefined number of repetitions can be used for one or more of the first synchronization signals (e.g., 2401, 2402, 2407, 2408), the other signals/channels in the SSB (e.g., the second synchronization signal or system information such as PBCH) (e.g., 2403, 2404, 2405, 2406, 2409, 2410, 2411, 2412).
  • the number of sub-bursts within one burst can be predefined, and can be different for different frequency bands.
  • the number of PSS transmissions and the number of transmissions of the other signals/channels in SSB (e.g., the second synchronization signal or system information such as PBCH) within each sub-burst can be predefined, and can be different for different frequency bands.
  • a gap with duration of T G can be inserted in every X symbols for the first synchronization signal, and every Y symbols for the one or more of the second synchronization signal or system information (e.g., PBCH).
  • system information e.g., PBCH
  • T G can be the duration required for transmit beam switching
  • X can be equal to a predefined repetition number
  • Y can be equal to the repetition number for the second synchronization signal and/or system information (e.g., PBCH), or equal to the sum of the repetition number for the second synchronization signal and/or system information (e.g., PBCH).
  • PBCH system information
  • T G can be 0, which means all symbols are transmitted continuously. Note that there can still exist gap between the end of the first synchronization signal transmission and the start of the second synchronization signal or system information (e.g., PBCH).
  • system information e.g., PBCH
  • T G , X and Y can be two predefined durations to allow other DL transmissions to be sent within the gap, to avoid a long latency for other DL transmissions.
  • (T G , X) can be two predefined durations to allow other DL transmissions to be sent within the gap, to avoid a long latency for other DL transmissions.
  • (T G , Y) can be two predefined durations to allow other DL transmissions to be sent within the gap, to avoid a long latency for other DL transmissions.
  • X and Y can be two predefined durations to allow other DL transmissions to be sent within the gap, to avoid a long latency for other DL transmissions.
  • T G can be different for PSS and SSS/PBCH transmissions. Also, the value of T G can be different for different frequency bands.
  • FIG. 25 illustrates a flowchart for an example of UE detection of the DL signal/channel for initial access according to embodiments of the present disclosure.
  • the method 2500 depicted in FIG. 25 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • the UE may keep receiving the first synchronization signal from one or more transmission instances. For example, the UE may receive the first synchronization signal from one or more transmission instances.
  • the UE determines one or more corresponding resources for the detection of one or more of the second synchronization signal or system information (e.g., PBCH), based on the detection of the first synchronization signal.
  • the potential set of resources and beams for detection of one or more of the second synchronization signal or system information e.g., PBCH
  • the UE can perform receive beam sweeping and determine the reception beams for detection of the second synchronization signal and/or system information (e.g., PBCH), based on reception of the first synchronization signal.
  • the UE may receive one or more of a second synchronization signal or system information (e.g., PBCH).
  • the UE may receive one or more of the second synchronization signal or system information (e.g., PBCH) from the one or more corresponding resources.
  • One or more embodiments of the disclosure may be implemented by a computer-readable recording medium including computer-executable instructions such as a program module executed by a computer.
  • the computer-readable recording medium may be an arbitrary available medium accessible by a computer, and examples thereof include all volatile media (e.g., RAM) and non-volatile media (e.g., ROM) and separable and non-separable media.
  • examples of the computer-readable recording medium may include a computer storage medium. Examples of the computer storage medium include all volatile and non-volatile media and separable and non-separable media, which have been implemented by an arbitrary method or technology, for storing information such as computer-readable instructions, data structures, program modules, and other data.
  • the embodiments of the disclosure may be implemented as software programs that include instructions stored in a computer-readable storage medium.
  • the computer is a device capable of invoking stored instructions from a storage medium and operating according to the embodiments of the disclosure according to the invoked instructions and may include an electronic device according to the embodiments of the disclosure.
  • the computer readable storage medium may be provided in the form of a non-transitory storage medium.
  • the term 'non-temporary' means that a storage medium does not include a signal and is tangible, regardless whether data is stored semi-permanently or temporarily on the storage medium.
  • a control method according to the embodiments of the disclosure may be provided included in a computer program product.
  • a computer program product may be traded between a seller and a buyer as a product.
  • the computer program product may include a software program and a computer readable storage medium storing the software program.
  • the computer program product may include a product (e.g., a downloadable app) in the form of a software program that is distributed electronically through a device manufacturer or an electronic market (e.g., Google Play Store, App Store).
  • a product e.g., a downloadable app
  • the storage medium may be a storage medium of a server of a manufacturer, a server of an electronic market, or a relay server that temporarily stores the software program.
  • the computer program product may include a storage medium of a server or a storage medium of a device in a system including the server and the device.
  • a third device e.g., a smart phone
  • the computer program product may include a storage medium of the third device.
  • the computer program product may include the software program itself transmitted from the server to the device or the third device or transmitted from the third device to the device.
  • the disclosure relates to design of DL signal/channel for initial access (e.g., in high frequency band communication systems) that enables multi-stage beam acquisition.
  • the disclosed design supports transmission of first synchronization signal, and second synchronization signal and/or system information (e.g. PBCH) multiplexed in time and/or frequency manner and in different transmission beams, e.g. first synchronization signal in wide beams associated with multiple second synchronization signal and/or system information (e.g. PBCH) transmissions in narrow beams.
  • first synchronization signal and second synchronization signal and/or system information
  • PBCH system information

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente divulgation se rapporte à un système de communication 5G ou à un système de communication 6G destiné à prendre en charge des débits de données supérieurs à ceux d'un système de communication 4G tel que l'évolution à long terme (LTE). Selon des modes de réalisation de la divulgation, un bloc de signal de synchronisation (SSB) comprenant un signal de synchronisation primaire (PSS), un signal de synchronisation secondaire (SSS), un canal de diffusion physique (PBCH) peut être transmis au moyen de premier et second faisceaux. Un ou plusieurs symboles adjacents aux premier et second signaux de synchronisation peuvent être configurés pour s'adapter à un temps de commutation de faisceau.
PCT/KR2021/005396 2020-04-28 2021-04-28 Procédé et appareil de transmission de signal de liaison descendante pour un accès initial dans un système de communication sans fil WO2021221468A1 (fr)

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EP21796991.4A EP4115544A4 (fr) 2020-04-28 2021-04-28 Procédé et appareil de transmission de signal de liaison descendante pour un accès initial dans un système de communication sans fil
CN202180031939.2A CN115462011A (zh) 2020-04-28 2021-04-28 无线通信系统中用于初始接入的下行链路信号的传输的方法和装置

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US202063016619P 2020-04-28 2020-04-28
US202063016597P 2020-04-28 2020-04-28
US63/016,619 2020-04-28
US63/016,597 2020-04-28
US202063050528P 2020-07-10 2020-07-10
US202063050551P 2020-07-10 2020-07-10
US63/050,551 2020-07-10
US63/050,528 2020-07-10
US17/125,851 2020-12-17
US17/125,851 US20210337494A1 (en) 2020-04-28 2020-12-17 Method and apparatus for indication and transmission of downlink signal/channel for initial access
KR10-2021-0054639 2021-04-27
KR1020210054639A KR20210133167A (ko) 2020-04-28 2021-04-27 무선 통신 시스템에서 초기 액세스를 위한 다운링크 신호 송신을 위한 방법 및 장치

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