WO2021068006A2 - Mesure de cellules sur la base d'un signal de synchronisation primaire - Google Patents

Mesure de cellules sur la base d'un signal de synchronisation primaire Download PDF

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Publication number
WO2021068006A2
WO2021068006A2 PCT/US2021/013429 US2021013429W WO2021068006A2 WO 2021068006 A2 WO2021068006 A2 WO 2021068006A2 US 2021013429 W US2021013429 W US 2021013429W WO 2021068006 A2 WO2021068006 A2 WO 2021068006A2
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Prior art keywords
pss
sss
ssb
pci
epre
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PCT/US2021/013429
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English (en)
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WO2021068006A3 (fr
Inventor
Yuanye WANG
Ping Hou
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Zeku, Inc.
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Priority to CN202180018849.XA priority Critical patent/CN115244876A/zh
Publication of WO2021068006A2 publication Critical patent/WO2021068006A2/fr
Publication of WO2021068006A3 publication Critical patent/WO2021068006A3/fr

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Classifications

    • 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

  • Embodiments of the present disclosure relate to apparatus and method for wireless communication.
  • Radio Resource Management is a procedure carried out at the physical layer of the user equipment (UE) side to quantify the quality of its serving and neighboring cells. Such measurement results are used for Radio Resource Management (RRM) decision at the upper layer, or for some physical layer procedures, e.g., beam management.
  • RRM Radio Resource Management
  • SSB Synchronization Signal/PBCH Block
  • CSI-RS Channel State Information Reference Signal
  • Synchronization Signals are disclosed herein.
  • a terminal device includes at least one processor and memory storing instructions. The instructions, when executed by the at least one processor, cause the terminal device at least to obtain a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; obtain a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS) and a PBCH Demodulation Reference Signal (DMRS) of the SSB; and perform a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • DMRS PBCH Demodulation Reference Signal
  • a terminal device includes at least one processor and memory storing instructions.
  • the instructions when executed by the at least one processor, cause the terminal device at least to obtain a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; obtain a Primary Synchronization Signal (PSS) of the SSB; obtain a Physical layer Cell Identity (PCI) of the at least one base station based on the SSB; upon a determination that the SSB contains more than one PCI, determine a PSS sequence number of each PCI; and upon a determination that the PSS sequence numbers of at least two PCIs are different, perform a cell measurement based on at least the PSS.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • PCI Physical layer Cell Identity
  • a baseband chip including a Physical (PHY) layer circuit includes a receiving module, an extraction module, and a cell measurement module.
  • the receiving module is configured to obtain a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station.
  • the extraction module is configured to extract a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a PBCH Demodulation Reference Signal (DMRS) from the SSB.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • DMRS PBCH Demodulation Reference Signal
  • the cell measurement module is configured to perform a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • a method implemented by a terminal device for wireless communication includes obtaining a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; obtaining a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a PBCH Demodulation Reference Signal (DMRS) of the SSB; and performing a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • DMRS PBCH Demodulation Reference Signal
  • a method implemented by a terminal device for wireless communication includes obtaining a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; obtaining a Primary Synchronization Signal (PSS) of the SSB; obtaining a Physical layer Cell Identity (PCI) of the at least one base station based on the SSB; determining whether the SSB contains more than one PCI; determining a PSS sequence number of each PCI upon a determination that the SSB contains more than one PCI; and performing a cell measurement based on at least the PSS upon a determination that the PSS sequence numbers of at least two PCIs are different.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • PCI Physical layer Cell Identity
  • a method implemented by a Physical (PHY) layer circuit of a baseband chip includes obtaining a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; extracting a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a PBCH Demodulation Reference Signal (DMRS) from the SSB; and performing a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • DMRS PBCH Demodulation Reference Signal
  • FIG. 1 illustrates an exemplary wireless network, according to some embodiments of the present disclosure.
  • FIG. 2 illustrates a block diagram of an exemplary node, according to some embodiments of the present disclosure.
  • FIG. 3 illustrates an exemplary SSB, according to some embodiments of the present disclosure.
  • FIG. 4 illustrates an exemplary use case of cell measurement based on at least the
  • FIG. 5 illustrates exemplary determination operations of PCI and PSS sequence number, according to some embodiments of the present disclosure.
  • FIG. 6 illustrates a block diagram of an apparatus including a baseband chip, a radio frequency (RF) chip, and a host chip, according to some embodiments of the present disclosure.
  • FIG. 7 illustrates a block diagram of an exemplary baseband chip for cell measurement based on a combination of PSS, SSS, and PBCH DMRS, according to some embodiments of the present disclosure.
  • FIG. 8 illustrates a flow chart of an exemplary method for cell measurement based on a combination of PSS, SSS, and PBCH DMRS, according to some embodiments of the present disclosure.
  • references in the specification to “one embodiment,” “an embodiment,” “an example embodiment,” “some embodiments,” “certain embodiments,” etc. indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it would be within the knowledge of a person skilled in the pertinent art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • the term “one or more” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense.
  • terms, such as “a,” “an,” or “the,” again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context.
  • the term “based on” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.
  • the techniques described herein may be used for various wireless communication networks, such as code division multiple access (CDMA) system, time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, orthogonal frequency division multiple access (OFDMA) system, single-carrier frequency division multiple access (SC- FDMA) system, and other networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC- FDMA single-carrier frequency division multiple access
  • a CDMA network may implement a Radio Access Technology (RAT) such as Universal Terrestrial Radio Access (UTRA), evolved UTRA (E-UTRA), CDMA 2000, etc.
  • TDMA network may implement a RAT such as GSM.
  • An OFDMA network may implement a RAT, such as Long-Term Evolution (LTE) or New Radio (NR).
  • LTE Long-Term Evolution
  • NR New Radio
  • SSS Synchronization Signal
  • PBCH Physical Broadcast Channel
  • DMRS Demodulation Reference Signal
  • Various embodiments in accordance with the present disclosure provide an improved cell measurement scheme based on the Primary Synchronization Signals (PSS) in each SSB to achieve a higher measurement accuracy compared with the existing solutions.
  • PSS Primary Synchronization Signals
  • the PSS which has a larger number of reference signal samples per SSB compared with the SSS or PBCH DMRS, is used for cell measurement to achieve higher accuracy.
  • the cell measurement scheme disclosed herein can avoid wrong handover or cell re-selection decisions due to inaccurate measurement, allows a UE to quickly detect serving cell quality issue when moving out of coverage, and allows a UE to quickly detect handover target cell in Radio Resource Control (RRC)-Connected state or detect a cell for re-selection in RRC-Idle state.
  • RRC Radio Resource Control
  • the UE battery power consumption can be reduced as well due to the smaller number of measurement trials in order to get a reliable measurement.
  • FIG. 1 illustrates an exemplary wireless network 100, in which certain aspects of the present disclosure may be implemented, according to some embodiments of the present disclosure.
  • wireless network 100 may include a network of nodes, such as a terminal device 102, an access node 104, and a core network element 106.
  • Terminal device 102 may be any terminal device, such as a mobile phone, a desktop computer, a laptop computer, a tablet, a vehicle computer, a gaming console, a printer, a positioning device, a wearable electronic device, a smart sensor, or any other device capable of receiving, processing, and transmitting information, such as any member of a vehicle to everything (V2X) network, a cluster network, a smart grid node, or an Intemet-of-Things (IoT) node. It is understood that terminal device 102 is illustrated as a mobile phone simply by way of illustration and not by way of limitation.
  • V2X vehicle to everything
  • IoT Intemet-of-Things
  • Access node 104 may be a device that communicates with terminal device 102, such as a wireless access point, a base station (BS), a Node B, an enhanced Node B (eNodeB or eNB), a next-generation NodeB (gNodeB or gNB), a cluster master node, or the like. Access node 104 may have a wired connection to terminal device 102, a wireless connection to terminal device 102, or any combination thereof. Access node 104 may be connected to terminal device 102 by multiple connections, and terminal device 102 may be connected to other access nodes in addition to access node 104. Access node 104 may also be connected to other terminal devices.
  • Core network element 106 may serve access node 104 and terminal device 102 to provide core network services.
  • core network element 106 may include a home subscriber server (HSS), a mobility management entity (MME), a serving gateway (SGW), or a packet data network gateway (PGW).
  • HSS home subscriber server
  • MME mobility management entity
  • SGW serving gateway
  • PGW packet data network gateway
  • EPC evolved packet core
  • Other core network elements may be used in LTE and in other communication systems.
  • core network element 106 includes an access and mobility management function (AMF) device, a session management function (SMF) device, or a user plane function (UPF) device, of a core network for the NR system. It is understood that core network element 106 is shown as a set of rack-mounted servers by way of illustration and not by way of limitation.
  • AMF access and mobility management function
  • SMF session management function
  • UPF user plane function
  • Core network element 106 may connect with a large network, such as the Internet
  • IP Internet Protocol
  • data from terminal device 102 may be communicated to other terminal devices connected to other access points, including, for example, a computer 110 connected to Internet 108, for example, using a wired connection or a wireless connection, or to a tablet 112 wirelessly connected to Internet 108 via a router 114.
  • computer 110 and tablet 112 provide additional examples of possible terminal devices
  • router 114 provides an example of another possible access node.
  • a generic example of a rack-mounted server is provided as an illustration of core network element 106. However, there may be multiple elements in the core network including database servers, such as a database 116, and security and authentication servers, such as an authentication server 118.
  • Database 116 may, for example, manage data related to user subscription to network services.
  • a home location register (HLR) is an example of a standardized database of subscriber information for a cellular network.
  • authentication server 118 may handle authentication of users, sessions, and so on.
  • an authentication server function (AUSF) device may be the specific entity to perform terminal device authentication.
  • a single server rack may handle multiple such functions, such that the connections between core network element 106, authentication server 118, and database 116, may be local connections within a single rack.
  • terminal device 102 e.g., a smartphone
  • terminal device 102 extracts the PSS, SSS, and PBCH DMRS from an SSB received from access node 104 (e.g., a node).
  • Terminal device 102 can then detect a Physical layer Cell Identity (PCI) of the base station and a PSS sequence number of each PCI from the SSB.
  • Terminal device 102 further detects a first Energy Per Resource Element (EPRE) value of the PSS and a second EPRE value of the SSS.
  • PCI Physical layer Cell Identity
  • EPRE Energy Per Resource Element
  • terminal device 102 can perform the cell measurement based on the combination of the PSS, the SSS, and the PBCH DMRS.
  • the PCI may be the identifier (ID) of a cell in a physical layer of a wireless network, such as an LTE PCI of the LTE network or an NR PIC of an NR network, used for cell identity during the cell selection procedure.
  • a PIC may determine the cell ID group and the cell ID sectors.
  • Each of the elements of FIG. 1 may be considered a node of wireless network 100.
  • Node 200 may be configured as terminal device 102, access node 104, or core network element 106 in FIG. 1. Similarly, node 200 may also be configured as computer 110, router 114, tablet 112, database 116, or authentication server 118 in FIG. 1. As shown in FIG. 2, node 200 may include a processor 202, a memory 204, a transceiver 206. These components are shown as connected to one another by a bus, but other connection types are also permitted. When node 200 is terminal device 102, additional components may also be included, such as a user interface (UI), sensors, and the like. Similarly, node 200 may be implemented as a blade in a server system when node 200 is configured as core network element 106. Other implementations are also possible.
  • UI user interface
  • Transceiver 206 may include any suitable device for sending and/or receiving data.
  • Node 200 may include one or more transceivers, although only one transceiver 206 is shown for simplicity of illustration.
  • An antenna 208 is shown as a possible communication mechanism for node 200. Multiple antennas and/or arrays of antennas may be utilized. Additionally, examples of node 200 may communicate using wired techniques rather than (or in addition to) wireless techniques.
  • access node 104 may communicate wirelessly to terminal device 102 and may communicate by a wired connection (for example, by optical or coaxial cable) to core network element 106.
  • Other communication hardware such as a network interface card (NIC), may be included as well.
  • NIC network interface card
  • node 200 may include processor 202. Although only one processor is shown, it is understood that multiple processors can be included.
  • Processor 202 may include microprocessors, microcontrollers, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout the present disclosure.
  • DSPs digital signal processors
  • ASICs application-specific integrated circuits
  • FPGAs field-programmable gate arrays
  • PLDs programmable logic devices
  • state machines gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout the present disclosure.
  • Processor 202 may be a hardware device having one or many processing cores.
  • Processor 202 may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Software can include computer instructions written in an interpreted language, a compiled language, or machine code. Other techniques for instructing hardware are also permitted under the broad category of software.
  • node 200 may also include memory 204. Although only one memory is shown, it is understood that multiple memories can be included. Memory 204 can broadly include both memory and storage.
  • memory 204 may include random-access memory (RAM), read-only memory (ROM), static RAM (SRAM), dynamic RAM (DRAM), ferro electric RAM (FRAM), electrically erasable programmable ROM (EEPROM), CD-ROM or other optical disk storage, hard disk drive (HDD), such as magnetic disk storage or other magnetic storage devices, Flash drive, solid-state drive (SSD), or any other medium that can be used to carry or store desired program code in the form of instructions that can be accessed and executed by processor 202.
  • RAM random-access memory
  • ROM read-only memory
  • SRAM static RAM
  • DRAM dynamic RAM
  • FRAM ferro electric RAM
  • EEPROM electrically erasable programmable ROM
  • CD-ROM or other optical disk storage hard disk drive (HDD), such as magnetic disk storage or other magnetic storage devices
  • HDD hard disk drive
  • SSD solid-
  • processor 202 processor 202, memory 204, and transceiver 206 of node
  • processor 202 may be integrated on a system-on-chip (SoC).
  • SoC system-on-chip
  • processor 202, memory 204, and transceiver 206 may be integrated on a baseband SoC (also known as a modem SoC, or a baseband model chipset), which can run an operating system (OS), such as a real-time operating system (RTOS) as its firmware.
  • OS operating system
  • RTOS real-time operating system
  • Various aspects of the present disclosure related to cell measurement based on at least the PSS may be implemented as hardware, software, and/or firmware elements in a baseband SoC of terminal device 102. It is understood that in some examples, one or more of the software and/or firmware elements may be implemented as dedicated hardware elements in the SoC as well.
  • FIG. 3 illustrates an exemplary structure of an SSB, according to some embodiments of the present disclosure.
  • An SSB includes three special signals and one physical channel: Primary Synchronization Signals (PSS), SSS, DMRS, and PBCH.
  • PSS Primary Synchronization Signals
  • SSS Session Signals
  • DMRS Downlink Reference Signals
  • PBCH Physical Broadcast Channel
  • OFDM Orthogonal Frequency-Division Multiplexing
  • OFDM is a type of digital transmission and a method of encoding digital data on multiple carrier frequencies and is used in applications such as digital television and audio broadcasting, wireless networks, power line networks, and mobile communications.
  • OFDM which is a frequency-division multiplexing (FDM) scheme
  • FDM frequency-division multiplexing
  • OFDM uses a guard interval, which provides better orthogonality in transmission channels affected by multipath propagation.
  • Each subcarrier i.e., signal
  • PSS which is a kind of binary pseudo-random m-sequence with a duration of 127 subcarriers (SCs), can occupy the first OFDM symbol and represents the physical-layer identity within the cell-identity group.
  • PSS occupies subcarriers with indexes from 56 to 182.
  • SSS which is located in the third OFDM symbol with a duration of 127 subcarriers, is generated from a combination of two m-sequences and, similar to PSS, occupies subcarriers with indexes from 56 to 182.
  • DMRS is located on every 4th subcarrier in each synchronization block OFDM symbol. DMRS occupies 144 resource elements within the synchronization block.
  • PBCH can occupy two full OFDM symbols and parts of a full OFDM symbol.
  • PBCH transmits 4 common information fields with service data, which must be demodulated by the terminal device.
  • the 576 information bits are transmitted by PBCH in each SSB, of which the last 24 bits are the cyclic redundancy check (CRC), and the 24 first bits are used for detection of the primary parameters of the cell configuration.
  • CRC cyclic redundancy check
  • the terminal device can find the sequence number of the SSB in the frame, after which it becomes possible detecting the radio frame beginning and then starting the procedure of time synchronization.
  • PSS is mapped to 127 subcarriers around the lower end of the system bandwidth.
  • PSS is used by UE for Downlink Frame Synchronization and provides Radio Frame Boundary in a radio frame.
  • PSS is also a factor to determine the PCI.
  • PSS is used to combine with SSS and PBCH DMRS for cell measurement
  • FIG. 4 illustrates an exemplary use case of cell measurement based on PSS, according to some embodiments of the present disclosure.
  • a terminal device 400 e.g., an example of terminal device 102 in FIG. 1
  • a processor 402 e.g., an example of processor 202 in FIG.
  • terminal device 400 obtains a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from a base station 406 (e.g., an example of access node 104 in FIG. 1) in connection with terminal device 400.
  • PBCH Physical Broadcast Channel
  • terminal device 400 may obtain SSB from more than one base station, for example, from base station 406 and base station 408 as shown in FIG. 4.
  • base station 406 or 408 is depicted as a single element, it will be appreciated that base station 406 or 408 may be replaced with any number of interconnected base stations and/or network elements.
  • Base station 406 can generate SSBs as described above in FIG. 3 and transmit the SSBs to terminal device 400.
  • terminal device 400 obtains the SSS, PSS, and PBCH DMRS from each SSB in consecutive OFDM symbols.
  • Each SSB occupies four OFDM symbols in the time domain and spread over 240 subcarriers in the frequency domain, as shown in FIG. 3.
  • terminal device 400 receives SSB from base station 406 and/or 408 and extracts the SSS, PSS, and PBCH DMRS from the SSB. Then, a cell measurement is performed based on the reference signal samples of the SSS, PSS and PBCH DMRS.
  • the UE can quickly detects serving cell quality issue when moving out of coverage, and quickly detects handover target cell in RRC-Connected state or detects a cell for re-selection in RRC-Idle state. Furthermore, the UE battery power consumption can be reduced as well due to the smaller number of measurement trials in order to get a reliable measurement.
  • terminal device 400 obtains the SSS, PSS, and PBCH
  • terminal device 400 may further obtain a Physical layer Cell Identity (PCI) of base station 406 and/or 408 based on the SSB.
  • PCI is the identifier of a cell in the physical layer of the network, which is used for the separation of different transmitters.
  • PCI is calculated by adding two different downlink synchronization signals, PSS and SSS. For an allocation to be collision-free, there should not be any two neighboring cells at the same frequency sharing the same PCI. If a UE is to be handed over from one cell to another, and the source and target cells are sharing the same PCI, there is no unambiguous way to notify the UE to which cell it should be handed over to. Therefore, in wireless communication applications, different base stations have different PCIs.
  • terminal device 400 When terminal device 400 receives SSB from only one base station, terminal device
  • terminal device 400 should obtain only one PCI, and terminal device 400 would then perform the cell measurement based on the reference signal samples of the combination of SSS, PSS and PBCH DMRS.
  • terminal device 400 receives SSB from more than one base station, for example, from base station 406 and base station 408 shown in FIG. 4, terminal device 400 should obtain more than one PCI, and a further determination will be performed.
  • terminal device 400 may further determine a PSS sequence number of each PCI.
  • PSS consists of three different sequence numbers, 0, 1, and 2, and the sequence numbers are obtained from the cell identities of the base stations.
  • the sequence numbers of different base stations may be different or may be the same.
  • the PSS may not be used to perform the cell measurement because of the PSS collision.
  • FIG. 5 illustrates exemplary determination operations of PCI and PSS sequence number, according to some embodiments of the present disclosure.
  • SSB0 contains two different PCIs, PCI 0 and PCI 100.
  • SSB0 is obtained from two different base stations.
  • the base station with PCI 0 uses PSS sequence 0, and the base station with PCI 100 uses PSS sequence 1. Therefore, there is no collision, and this PSS can be used to perform cell measurements.
  • SSB1 contains two different PCIs, PCI 200 and PCI 300.
  • the base station with PCI 200 uses PSS sequence 2
  • the base station with PCI 300 uses PSS sequence 0. Therefore, in operation 504, there is no collision as well, and this PSS can be used to perform cell measurement.
  • SSB2 contains two different PCIs, PCI 0 and PCI 300.
  • the base station with PCI 0 and the base station with PCI 300 both use PSS sequence 0, which collide each other. Therefore, this PSS cannot be used to perform cell measurements.
  • SSB3 contains only one PCI, and the collision determination procedure is not needed, and this PSS can be used to perform the cell measurement.
  • terminal device 400 may further detect an Energy Per Resource Element (EPRE) value of PSS and an EPRE value of SSS.
  • EPRE Energy Per Resource Element
  • the base station determines the downlink transmission energy per resource element, and UE may assume downlink cell-specific reference signal EPRE, including PSS EPRE and SSS EPRE, to be constant across the downlink system bandwidth and constant across all subframes until different cell-specific reference signal power information is received.
  • PSS transmitting power may be different in some applications, and, under this situation, the PSS power has to be offset before performing the cell measurement.
  • the ratio of PSS EPRE to SSS EPRE in a SS/PBCH block is either OdB or 3dB.
  • PSS When the ratio of PSS EPRE to SSS EPRE is OdB, the PSS power is the same as the SSS power, and no offsetting is needed. Under this situation, PSS can be used along with SSS and PBCH DMRS to perform the cell measurement. However, when PSS EPRE is about 3dB higher than SSS EPRE, the offsetting of PSS is required. After offsetting PSS, the offset PSS can be used along with SSS and PBCH DMRS to perform the cell measurement. The offsetting of PSS means reducing the PSS signal strength by 3dB.
  • FIG. 6 illustrates a block diagram of an apparatus 600 including a baseband chip
  • Apparatus 600 may be an example of any suitable node of wireless network 100 in FIG. 1, such as terminal device 102 in FIG. 1 or terminal device 400 in FIG. 4. As shown in FIG. 6, apparatus 600 may include baseband chip 602, RF chip 604, host chip 606, and one or more antennas 610.
  • baseband chip 602 is implemented by processor 202 and memory 204
  • RF chip 604 is implemented by processor 202, memory 204, and transceiver 206, as described above with respect to FIG. 2.
  • the cell measurement scheme based on a combination of PSS, SSS, and PBCH DMRS disclosed herein can be implemented as PHY layer components of baseband chip 602 of apparatus 600.
  • Each chip 602, 604, or 606 can include on-chip memory (also known as “internal memory,” e.g., registers, buffers, or caches).
  • the on-chip memory of baseband chip 602 may be used to buffer the reference signal samples in the PSS, SSS, and PBCH DMRS for performing the cell measurement.
  • apparatus 600 may further include an external memory 608 (e.g., the system memory or main memory) that can be shared by each chip 602, 604, or 606 through the system/main bus.
  • external memory 608 e.g., the system memory or main memory
  • baseband chip 602 is illustrated as a standalone SoC in FIG. 6, it is understood that in one example, baseband chip 602 and RF chip 604 may be integrated as one SoC; in another example, baseband chip 602 and host chip 606 may be integrated as one SoC; in still another example, baseband chip 602, RF chip 604, and host chip 606 may be integrated as one SoC, as described above.
  • host chip 606 may generate raw data and send it to baseband chip 602 for encoding, modulation, and mapping.
  • Baseband chip 602 may also access the raw data generated by host chip 606 and stored in external memory 608, for example, using the direct memory access (DMA).
  • DMA direct memory access
  • Baseband chip 602 may first encode (e.g., by source coding and/or channel coding) the raw data and modulate the coded data using any suitable modulation techniques, such as multi-phase pre-shared key (MPSK) modulation or quadrature amplitude modulation (QAM).
  • MPSK multi-phase pre-shared key
  • QAM quadrature amplitude modulation
  • Baseband chip 602 may perform any other functions, such as a symbol or layer mapping, to convert the raw data into a signal that can be used to modulate the carrier frequency for transmission.
  • baseband chip 602 may send the modulated signal to RF chip 604.
  • RF chip 604 through the transmitter (Tx), may convert the modulated signal in the digital form into analog signals, i.e., RF signals, and perform any suitable front-end RF functions, such as filtering, up-conversion, or sample-rate conversion.
  • Antenna 610 e.g., an antenna array
  • antenna 610 may receive RF signals and pass the RF signals to the receiver (Rx) of RF chip 604.
  • RF chip 604 may perform any suitable front-end RF functions, such as filtering, down-conversion, or sample-rate conversion, and convert the RF signals into low- frequency digital signals (baseband signals) that can be processed by baseband chip 602.
  • baseband chip 602 may demodulate and decode the baseband signals (including the SSBs) to extract raw data that can be processed by host chip 606.
  • Baseband chip 602 may perform additional functions, such as error checking, de-mapping, channel estimation, descrambling, etc.
  • the raw data provided by baseband chip 602 may be sent to host chip 606 directly or stored in external memory 608.
  • FIG. 7 illustrates a block diagram of an exemplary baseband chip 700 for cell measurement based on a combination of PSS, SSS, and PBCH DMRS, according to some embodiments of the present disclosure.
  • Baseband chip 700 e.g., an example of baseband chip 602 in FIG. 6
  • PHY Physical
  • baseband chip 700 in conjunction with a transceiver 702 e.g., an example of RF chip 604 in FIG. 6) can implement the cell measurement based on a combination of PSS, SSS, and PBCH DMRS disclosed herein.
  • baseband chip 700 and transceiver 702 are integrated on a baseband SoC (also known as a modem SoC or a baseband model chipset).
  • PHY layer circuit 704 may include, for example, a receiving module 706, an extraction module 708, a determination module 710, a detection module 712, an offsetting module 714, and a cell measurement module 716.
  • each module 706, 708, 710, 712, 714, or 716 of PHY layer circuit 704 is a dedicated integrated circuit (IC) for performing the respective functions described below in detail, such as an ASIC circuit.
  • IC dedicated integrated circuit
  • modules 706, 708, 710, 712, 714, and 716 of PHY layer circuit 704 may be implemented as a software module running on a generic processor (e.g., a microcontroller) on baseband chip 700.
  • PHY layer circuit 704 may be replaced with hybrid hardware and software modules on baseband chip 700.
  • Buffer 703 may be part of on-chip memory of baseband chip 700.
  • Transceiver 702 may be configured to receive signals from the network, such as a base station (e.g., an example of access node 104 in FIG. 1).
  • the network is a 5G wireless network having an NR. It is understood that the wireless network is not limited to including an NR and may include any other suitable RAT, such as Global System for Mobile Communications (GSM) or Universal Mobile Telecommunications System (UMTS) for cellular networks, and Bluetooth or Wi-Fi for wireless local area networks (WLANs), with any suitable combinations thereof.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • WLANs wireless local area networks
  • the terminal device having baseband chip 700 and transceiver 702 may be camped on an NR cell of an NR base station (e.g., eNB), and transceiver 702 may communicate with the NR base station, for example, by receiving SSBs from the NR base station in RRC- Connected state or in RRC-Idle state.
  • a base station e.g., eNB
  • Receiving module 706 may be configured to receives SSB from one or more than one base station. Receiving module 706 is configured to operate with OFDM format to combine the benefits of Quadrature Amplitude Modulation (QAM) and Frequency Division Multiplexing (FDM) and produce a high-data-rate communication system. Extraction module 708 may be configured to extract the PSS, SSS, and PBCH DMRS from each SSB, for example, based on the arrangements of PSS, SSS, and PBCH DMRS in the frequency domain and time domain in each SSB as described above with respect to FIG. 3. In some embodiments, receiving module 706 and extraction module 708 may be two individual modules. In some embodiments, receiving module 706 may include extraction module 708.
  • the PSS, SSS, and PBCH DMRS extracted from each SSB may be stored in buffer 703 for the operations in cell measurement module 716.
  • cell measurement module 716 may be configured to perform a cell measurement later based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • extraction module 708 may be further configured to extract
  • PCI of the at least one base station and PSS sequence number of each PCI from the SSB, and PHY layer circuit 704 may further include determination module 710 to determine whether the extracted PSS is suitable for the cell measurement based on the extracted PCI and PSS sequence number.
  • Determination module 710 may be configured to determine whether the SSB contains more than one PCI. Since receiving module 706 may receive SSB from one or more than one base stations, PCI is used as the identifier of a cell in the physical layer of the network, which is used for the separation of different transmitters.
  • cell measurement module 716 may be configured to consequently perform a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS. [0061] In some embodiments, when determination module 710 determines more than one PCI is contained in SSB, which means receiving module 706 receives SSB from only one base station, under this situation, cell measurement module 716 may be configured to consequently perform a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS. [0061] In some embodiments, when determination module 710 determines more than one
  • PCI is contained in SSB, which means receiving module 706 receives SSB from more than one base station
  • determination module 710 may be further configured to determine whether the PSS sequence numbers of at least two PCIs are different. As described above, PSS consists of three different sequence numbers, 0, 1, and 2, and the sequence numbers are obtained from the cell identities of the base stations. When determination module 710 determines the PSS sequence numbers of different PCIs are the same, which means a PSS collision, the PSS may not be used to perform the cell measurement. In some embodiments, upon a determination that the PSS sequence numbers of at least two PCIs are different, cell measurement module 716 may be configured to consequently perform the cell measurement based on the combination of the PSS, the SSS, and the PBCH DMRS.
  • PHY layer circuit 704 may further include detection module
  • Detection module 712 may be configured to detect a first EPRE value of the PSS and a second EPRE value of the SSS.
  • UE may assume downlink cell-specific reference signal EPRE, including PSS EPRE and SSS EPRE, to be constant across the downlink system bandwidth and constant across all subframes until different cell-specific reference signal power information is received.
  • PSS transmitting power may be different in some applications, and the PSS power has to be offset before performing the cell measurement.
  • the ratio of PSS EPRE to SSS EPRE in a SS/PBCH block is either OdB or 3dB.
  • detection module 712 detects the ratio of PSS EPRE to SSS EPRE is about OdB, which means the PSS power is the same as the SSS power, no offsetting is needed, and the PSS can be used along with SSS and PBCH DMRS to perform the cell measurement.
  • detection module 712 detects the ratio of PSS EPRE to SSS EPRE is about 3dB, which means PSS EPRE is about 3dB higher than SSS EPRE, the offsetting of PSS is required.
  • Offsetting module 714 may be configured to offset 3dB of the signal strength of
  • cell measurement module 716 may be configured to perform the cell measurement based on the combination of the offset PSS, the SSS, and the PBCH DMRS.
  • Cell measurement module 716 may be configured to perform cell measurement based on the reference signal samples in PSS (or offset PSS), SSS, and PBCH DMRS. For example, 398 reference signal samples in PSS (or offset PSS), SSS, and PBCH DMRS in each SSB may be used by cell measurement module 716 to perform the cell measurement.
  • FIG. 8 illustrates a flow chart of an exemplary method 800 for cell measurement based on PSS, SSS, and PBCH DMRS, according to some embodiments of the present disclosure.
  • Examples of the apparatus that can perform operations of method 800 include, for example, terminal device 102 and 400 depicted in FIGs. 1 and 4, and baseband chip 602 and 700 depicted in FIGs. 6 and 7, respectively, or any other apparatus disclosed herein. It is understood that the operations shown in method 800 are not exhaustive and that other operations can be performed as well before, after, or between any of the illustrated operations. Further, some of the operations may be performed simultaneously, or in a different order than shown in FIG. 8. It should be noted that the entire process of method 800 including operations 802, 804, 806, 808, 810, 812, 814, 816, 818, and 820 described below may be performed in either idle state or connected state of a terminal device.
  • method 800 starts at operation 802, in which a terminal device obtains an SSB from at least one base station.
  • the terminal device receives the SSB from at least one base station.
  • the PHY layer of the terminal device receives the SSB from at least one base station.
  • receiving module 706 may cause the terminal device to receive the SSB through transceiver 702.
  • the terminal device may obtain the SSB from one or more than one base station in connection with the terminal device.
  • the base stations may be an NR base station, e.g., a gNB.
  • Method 800 proceeds to operations 804, in which the PSS, SSS, and PBCH DMRS are extracted from the SSB received in operation 802.
  • the terminal device obtains the PSS, SSS, and PBCH DMRS from the base station.
  • PSS, SSS, and PBCH DMRS may be obtained together in consecutive OFDM symbols.
  • Each SSB occupies four OFDM symbols in the time domain and spread over 240 subcarriers in the frequency domain.
  • OFDM recognizes that bandlimited orthogonal signals can be combined with significant overlap while avoiding inter channel interference.
  • using OFDM an array of orthogonal subcarriers is created that work together to transmit information over a range of frequencies.
  • Method 800 proceeds to operations 806 and 808, as illustrated in FIG. 8, in which the terminal device obtains PCI of the at least one base station based on the SSB received in operation 802 and determines whether the SSB contains more than one PCI. Since the terminal device may receive the SSB from one or more than one base stations, PCI is used as the identifier of a cell in the physical layer of the network and is obtained in operation 806. When operation 808 determines the SSB contains only one PCI, which means the terminal device receives SSB from only one base station, method 800 may proceed to operation 820 to perform the cell measurement based on the combination of the PSS, SSS, and PBCH DMRS.
  • operation 808 determines the SSB contains more than one PCI, which means the terminal device receives SSB from more than one base station
  • method 800 may proceed to operations 810 and 812.
  • Operation 810 may obtain the PSS sequence number of each PCI, and operation 812 may further determine whether the PSS sequence numbers of the PCIs are different.
  • PSS consists of three different sequence numbers, 0, 1, and 2, and the sequence numbers are obtained from the cell identities of the base stations.
  • operation 812 determines the PSS sequence numbers of different PCIs are the same, which means a PSS collision, the PSS may not be used to perform the cell measurement, and method 800 may proceed to operation 802 again.
  • operation 812 may proceed to operations 814 and 816 to determine whether a signal strength adjustment is needed.
  • Operation 814 detects a first EPRE value of the PSS and a second EPRE value of the SSS.
  • the ratio of PSS EPRE to SSS EPRE in a SS/PBCH block is either OdB or 3dB.
  • Operation 816 may determine whether the PSS EPRE is about 3dB higher than the SSS EPRE or is about equal to the SSS EPRE.
  • method 800 may proceed to operation 820 to perform the cell measurement based on the combination of the PSS, SSS, and PBCH DMRS.
  • method 800 may proceed to operation 818 to offset the signal strength of the PSS.
  • Operation 818 offsets the signal strength of the PSS by reducing the signal strength of the PSS by 3dB.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computing device.
  • such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, HDD, such as magnetic disk storage or other magnetic storage devices, Flash drive, SSD, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a processing system, such as a mobile device or a computer.
  • Disk and disc includes CD, laser disc, optical disc, DVD, and floppy disk where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • a terminal device includes at least one processor and memory storing instructions.
  • the instructions when executed by the at least one processor, cause the terminal device at least to obtain a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; obtain a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS) and a PBCH Demodulation Reference Signal (DMRS) of the SSB; and perform a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • DMRS Demodulation Reference Signal
  • the instruction when executed by the at least one processor, further causes the terminal device to obtain a Physical layer Cell Identity (PCI) of the at least one base station based on the SSB; upon a determination that the SSB contains more than one PCI, determine a PSS sequence number of each PCI; and upon a determination that the PSS sequence numbers of at least two PCIs are different, perform the cell measurement based on the combination of the PSS, the SSS and the PBCH DMRS.
  • PCI Physical layer Cell Identity
  • the instruction when executed by the at least one processor, further causes the terminal device to, upon a determination that the SSB contains only one PCI, perform the cell measurement based on the combination of the PSS, the SSS, and the PBCH DMRS.
  • the instruction when executed by the at least one processor, further causes the terminal device to, upon a determination that the PSS sequence numbers of two PCIs are different, detect a first Energy Per Resource Element (EPRE) value of the PSS and a second EPRE value of the SSS; upon a determination that the first EPRE value of the PSS is about 3dB higher than the second EPRE value of the SSS, offset 3dB of a signal strength of the PSS; and perform the cell measurement based on the combination of the offset PSS, the SSS and the PBCH DMRS.
  • EPRE Energy Per Resource Element
  • the instruction when executed by the at least one processor, further causes the terminal device to, upon a determination that the first EPRE value of the PSS is about equal to the second EPRE value of the SSS, maintain the signal strength of the PSS; and perform the cell measurement based on the combination of the PSS, the SSS, and the PBCH DMRS.
  • the instruction when executed by the at least one processor, causes the terminal device to reduce the signal strength of the PSS by 3 dB.
  • a terminal device includes at least one processor and memory storing instructions.
  • the instructions when executed by the at least one processor, cause the terminal device at least to obtain a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station; obtain a Primary Synchronization Signal (PSS) of the SSB; obtain a Physical layer Cell Identity (PCI) of the at least one base station based on the SSB; upon a determination that the SSB contains more than one PCI, determine a PSS sequence number of each PCI; and upon a determination that the PSS sequence numbers of at least two PCIs are different, perform a cell measurement based on at least the PSS.
  • PBCH Synchronization Signal/ Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • PCI Physical layer Cell Identity
  • the instruction when executed by the at least one processor, further causes the terminal device to, upon a determination that the PSS sequence numbers of at least two PCIs are different, detect a first Energy Per Resource Element (EPRE) value of the PSS and a second EPRE value of a Secondary Synchronization Signal (SSS); compare the first EPRE value of the PSS with the second EPRE value of the SSS; upon a determination that the first EPRE value of the PSS is about 3dB higher than the second EPRE value of the SSS, offset 3dB of a signal strength of the PSS; and perform the cell measurement based on at least the offset PSS.
  • EPRE Energy Per Resource Element
  • SSS Secondary Synchronization Signal
  • the instruction when executed by the at least one processor, further causes the terminal device to, upon a determination that the first EPRE value of the PSS is about equal to the second EPRE value of the SSS, maintain the signal strength of the PSS; and perform the cell measurement based on at least the PSS.
  • a baseband chip includes a
  • the Physical (PHY) layer circuit including a receiving module, an extraction module, and a cell measurement module.
  • the receiving module is configured to obtain a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) from at least one base station.
  • the extraction module is configured to extract a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a PBCH Demodulation Reference Signal (DMRS) from the SSB.
  • the cell measurement module is configured to perform a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • the extraction module is further configured to extract a
  • PCI Physical layer Cell Identity
  • the PHY layer circuit further includes a determination module configured to determine whether the SSB contains more than one PCI, and, upon a determination that the SSB contains more than one PCI, determine whether the PSS sequence numbers of at least two PCIs are different.
  • the cell measurement module is configured to perform the cell measurement based on the combination of the PSS, the SSS and the PBCH DMRS.
  • the PHY layer circuit further includes a detection module and an offsetting module.
  • the detection module is configured to, upon a determination that the PSS sequence numbers of at least two PCIs are different, detect a first Energy Per Resource Element (EPRE) value of the PSS and a second EPRE value of the SSS.
  • the offsetting module is configured to offset 3dB of a signal strength of the PSS when the first EPRE value of the PSS is about 3dB higher than the second EPRE value of the SSS.
  • the cell measurement module is configured to perform the cell measurement based on the combination of the offset PSS, the SSS, and the PBCH DMRS.
  • a method implemented by a terminal device for wireless communication is disclosed.
  • a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) is obtained from at least one base station.
  • a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a PBCH Demodulation Reference Signal (DMRS) of the SSB are obtained.
  • a cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS is performed.
  • a Physical layer Cell Identity (PCI) of the at least one base station based on the SSB is obtained. Whether the SSB contains more than one PCI is determined. A PSS sequence number of each PCI is obtained, upon a determination that the SSB contains more than one PCI. Whether the PSS sequence numbers of at least two PCIs are different is determined. The cell measurement based on the combination of the PSS, the SSS, and the PBCH DMRS is performed, upon a determination that the PSS sequence numbers of at least two PCIs are different.
  • PSS and a second EPRE value of the SSS are detected, upon a determination that the PSS sequence numbers of two PCIs are different. Whether the first EPRE value of the PSS is about 3dB higher than or is about equal to the second EPRE value of the SSS is determined. A signal strength of the PSS is offset 3dB, upon a determination that the first EPRE value of the PSS is about 3dB higher than the second EPRE value of the SSS. The cell measurement is performed based on the combination of the offset PSS, the SSS, and the PBCH DMRS.
  • a method implemented by a terminal device for wireless communication is disclosed.
  • a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) is obtained from at least one base station.
  • a Primary Synchronization Signal (PSS) of the SSB is obtained.
  • a Physical layer Cell Identity (PCI) of the at least one base station is obtained based on the SSB. Whether the SSB contains more than one PCI is determined.
  • a PSS sequence number of each PCI is determined, upon a determination that the SSB contains more than one PCI.
  • a cell measurement is performed based on at least the PSS upon a determination that the PSS sequence numbers of at least two PCIs are different.
  • PSS and a second EPRE value of a Secondary Synchronization Signal are detected upon a determination that the PSS sequence numbers of at least two PCIs are different.
  • the first EPRE value of the PSS is compared with the second EPRE value of the SSS.
  • the signal strength of the PSS is offset 3dB upon a determination that the first EPRE value of the PSS is about 3dB higher than the second EPRE value of the SSS.
  • the cell measurement is performed based on at least the offset PSS.
  • a method implemented by a Physical (PHY) layer circuit of a baseband chip is disclosed.
  • a Synchronization Signal/ Physical Broadcast Channel (PBCH) Block (SSB) is obtained from at least one base station.
  • PBCH Physical Broadcast Channel
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • DMRS PBCH Demodulation Reference Signal
  • a cell measurement is performed based on a combination of the PSS, the SSS, and the PBCH DMRS.
  • a Physical layer Cell Identity (PCI) of the at least one base station and a PSS sequence number of each PCI from the SSB are extracted. Whether the SSB contains more than one PCI is determined. Upon a determination that the SSB contains more than one PCI, whether the PSS sequence numbers of at least two PCIs are different is determined. Upon a determination that the PSS sequence numbers of at least two PCIs are different, a first Energy Per Resource Element (EPRE) value of the PSS and a second EPRE value of the SSS are detected. A signal strength of the PSS is offset 3dB when the first EPRE value of the PSS is about 3dB higher than the second EPRE value of the SSS. The cell measurement is performed based on the combination of the offset PSS, the SSS, and the PBCH DMRS.
  • PCI Physical layer Cell Identity

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  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif terminal qui comprend au moins un processeur et une mémoire dans laquelle sont stockées des instructions. L'exécution des instructions par le ou les processeurs entraîne au moins l'obtention par le dispositif terminal d'un bloc de signal de synchronisation (SSB)/canal de diffusion physique (PBCH) en provenance d'au moins une station de base ; l'obtention d'un signal de synchronisation primaire (PSS), d'un signal de synchronisation secondaire (SSS) et d'un signal de référence de démodulation (DMRS) de PBCH du SSB ; et la réalisation d'une mesure de cellules sur la base d'une combinaison du PSS, du SSS et du DMRS de PBCH.
PCT/US2021/013429 2020-03-02 2021-01-14 Mesure de cellules sur la base d'un signal de synchronisation primaire WO2021068006A2 (fr)

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Cited By (2)

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US20220312400A1 (en) * 2020-09-15 2022-09-29 Apple Inc. Symbol Level Beam Sweeping Configuration
EP4156560A1 (fr) * 2021-09-24 2023-03-29 Apple Inc. Détection commune pour le signal de synchronisation primaire (pss) et autres symboles de signal de synchronisation dans une recherche de cellules cibles

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Publication number Priority date Publication date Assignee Title
WO2015148815A1 (fr) * 2014-03-27 2015-10-01 Zte Wistron Telecom Ab Procédé et système pour effectuer des mesures sur la base de propriétés de signal de synchronisation
JP6816311B2 (ja) * 2017-06-16 2021-01-20 エルジー エレクトロニクス インコーポレイティド 同期信号ブロックを測定する方法及びそのための装置
JP6974482B2 (ja) * 2017-11-17 2021-12-01 エルジー エレクトロニクス インコーポレイティドLg Electronics Inc. 下りリンクチャネルを送受信する方法及びそのための装置
US10834708B2 (en) * 2018-07-06 2020-11-10 Samsung Electronics Co., Ltd. Method and apparatus for NR sidelink SS/PBCH block
US11224002B2 (en) * 2018-07-16 2022-01-11 Qualcomm Incorporated Multi-cell notification zone single frequency network
WO2020041196A1 (fr) * 2018-08-20 2020-02-27 Intel Corporation Acquisition initiale rapide via la transmission de blocs de signaux de synchronisation non orthogonaux dans un système 5g new radio

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220312400A1 (en) * 2020-09-15 2022-09-29 Apple Inc. Symbol Level Beam Sweeping Configuration
EP4156560A1 (fr) * 2021-09-24 2023-03-29 Apple Inc. Détection commune pour le signal de synchronisation primaire (pss) et autres symboles de signal de synchronisation dans une recherche de cellules cibles
US11705979B2 (en) 2021-09-24 2023-07-18 Apple Inc. Joint detection for primary synchronization signal (PSS) and other synchronization signal symbols in target cell search

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