WO2020188628A1 - Dispositif de station de base, dispositif terminal, et procédé de communication sans fil - Google Patents

Dispositif de station de base, dispositif terminal, et procédé de communication sans fil Download PDF

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Publication number
WO2020188628A1
WO2020188628A1 PCT/JP2019/010825 JP2019010825W WO2020188628A1 WO 2020188628 A1 WO2020188628 A1 WO 2020188628A1 JP 2019010825 W JP2019010825 W JP 2019010825W WO 2020188628 A1 WO2020188628 A1 WO 2020188628A1
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WIPO (PCT)
Prior art keywords
synchronization signal
signal block
base station
broadcast channel
physical broadcast
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PCT/JP2019/010825
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English (en)
Japanese (ja)
Inventor
陽介 秋元
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ソフトバンク株式会社
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Priority to PCT/JP2019/010825 priority Critical patent/WO2020188628A1/fr
Publication of WO2020188628A1 publication Critical patent/WO2020188628A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to a base station device, a terminal device, and a wireless communication method.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • eMBB enhanced Mobile Broad Band
  • URLLC Ultra-Reliable and Low Latency Communication
  • IoT Internet of Things
  • Non-Patent Document 1 a technique has been adopted in which a base station device repeatedly transmits the same signal or transmits while changing the repeated version (RedundancyVersion) to expand the coverage area (from Non-Patent Document 1). See 3).
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a base station device, a terminal device, and a wireless communication method capable of expanding the coverage area by a method different from the conventional method.
  • the base station apparatus transmits a synchronization signal block generation unit that generates a first synchronization signal block and a second synchronization signal block, and a first synchronization signal block and a second synchronization signal block at predetermined intervals.
  • the first synchronization signal block includes a primary synchronization signal and a physical broadcast channel
  • the second synchronization signal block includes a physical broadcast channel and does not include a primary synchronization signal.
  • the terminal device is a terminal device that wirelessly communicates with the base station device, and includes a synchronization signal block receiving unit that receives a first synchronization signal block and a second synchronization signal block from the base station device.
  • a cell detection unit that detects a cell of a base station apparatus based on a first synchronization signal block and a second synchronization signal block is provided, and the first synchronization signal block includes a primary synchronization signal and a physical broadcast channel, and is a first.
  • the two sync signal blocks include the physical broadcast channel and do not include the primary sync signal.
  • the wireless communication method is a wireless communication method used in a base station apparatus, which generates a first synchronous signal block and a second synchronous signal block, and a first synchronous signal block and a first synchronous signal block.
  • Synchronous signal blocks include transmitting at predetermined intervals, the first synchronous signal block includes a primary synchronous signal and a physical broadcast channel, and the second synchronous signal block includes a physical broadcast channel and is primary sync. Does not include signal.
  • the wireless communication method is a wireless communication method used for a terminal device that performs wireless communication with a base station device, and receives a first synchronous signal block and a second synchronous signal block from the base station device.
  • the first synchronization signal block includes a primary synchronization signal and a physical broadcast channel, including the detection of a cell of the base station apparatus based on the first synchronization signal block and the second synchronization signal block.
  • the second sync signal block includes the physical broadcast channel and does not include the primary sync signal.
  • the coverage area can be expanded by a method different from the conventional method.
  • FIG. 1 is a configuration diagram illustrating a schematic configuration of a wireless communication system according to an embodiment.
  • FIG. 2 is a block diagram illustrating a schematic configuration of a base station apparatus according to an embodiment.
  • FIG. 3 is a diagram for explaining the structure of the radio frame transmitted by the base station apparatus in one embodiment.
  • FIG. 4 is a configuration diagram illustrating a configuration of a synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 5 is a diagram for explaining beam sweeping performed by the base station apparatus in one embodiment.
  • FIG. 6 is a diagram for explaining an example of a predetermined period of a synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 7 is a diagram for explaining an example of arrangement in the slot of the synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 8 is a diagram for explaining an example of the coverage area expansion function of the base station apparatus in one embodiment.
  • FIG. 9 is a diagram for explaining another example of the coverage area expansion function of the base station apparatus in one embodiment.
  • FIG. 10 is a configuration diagram showing a first example of the configuration of the second synchronization signal block SSB2 transmitted by the base station apparatus in one embodiment.
  • FIG. 11 is a configuration diagram showing a second example of the configuration of the second synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 12 is a configuration diagram showing a third example of the configuration of the second synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 13 is a configuration diagram showing a fourth example of the configuration of the second synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 14 is a diagram for explaining an example of a predetermined period of the first synchronization signal block and the second synchronization signal block transmitted by the base station apparatus in one embodiment.
  • FIG. 15 is a block diagram illustrating a schematic configuration of a terminal device according to an embodiment.
  • FIG. 16 is a time chart for explaining an example of the operation of the base station device and the terminal device in one embodiment.
  • FIG. 1 is a configuration diagram illustrating a schematic configuration of a wireless communication system 100 according to an embodiment.
  • the wireless communication system 100 includes a base station device 10a and a base station device 10n, a terminal device 50a and a terminal device 50m, and a core device 90.
  • the wireless communication system 100 is, for example, a wireless communication system for NR.
  • the present invention is applicable to any wireless communication system including at least a terminal device and a base station device, and is not limited to those targeting NR.
  • the present invention is also applicable to LTE and LTE-Advanced. It can also be applied to a wireless communication system that uses NR as a part of the wireless communication system.
  • LTE and LTE-Advanced are also referred to as E-UTRA (Evolved Universal Terrestrial Radio Access), but their meanings are the same.
  • the area (cover area) formed by the base station apparatus is referred to as a cell, and E-UTRA and NR are cellular communication systems constructed by a plurality of cells.
  • the terminal device 50a or the terminal device 50m is wirelessly connected to the base station device 10a or the base station device 10n. Further, each of the terminal device 50a or the terminal device 50m may be wirelessly connected at the same time as the base station device 10a and the base station device 10n.
  • E-UTRA or NR can be used for the base station device 10a and the base station device 10n.
  • the base station apparatus 10a may use NR and the base station apparatus 10n may use E-UTRA, and vice versa.
  • the base station device in E-UTRA is called eNB (evolved NodeB), and the base station device in NR is called gNB (g-NodeB).
  • the term “base station apparatus” when used, it means that both eNB and gNB are included.
  • the terminal device in E-UTRA and NR is referred to as UE (User Equipment).
  • the base station device gNB in the NR may be connected to the terminal device by using a part of the frequency band (BWP: Carrier bandwidth part) used.
  • BWP Carrier bandwidth part
  • FIG. 1 illustrates the base station device 10a and the base station device 10n as n base station devices (n is an integer of 2 or more). However, in the following description, when these n base station devices 10 are described without distinction, a part of the reference numerals is omitted and the term "base station device 10" is simply referred to. Further, FIG. 1 illustrates the terminal device 50a and the terminal device 50m as terminal devices in the m range (m is an integer of 2 or more). In the following description, when these m terminal devices are described without distinction, a part of the reference numerals is omitted and the term "terminal device 50" is simply referred to.
  • the terminal device 50 may be connected to the base station device 10 in cell units, for example, and may be connected using a plurality of cells, for example, carrier aggregation.
  • the base station device to be initially connected is the master node (MN: MasterNode), and the base station device to be additionally connected is It is called a secondary node (SN: Secondary Node).
  • MN MasterNode
  • SN Secondary Node
  • the base station devices are connected by a base station interface.
  • the base station device 10 and the core device 90 are connected by a core interface.
  • the base station interface is used for exchanging control signals necessary for handover and cooperative operation between base station devices.
  • the core device 90 has, for example, a base station device 10 under its control, and mainly handles load control between base station devices, call (paging) of the terminal device 50, and movement control such as location registration.
  • the terminal device 50 and the base station device 10 send and receive RRC messages in the radio resource control (RRC: Radio Resource Control) layer. Further, the terminal device 50 and the base station device 10 transmit and receive a MAC control element (MAC CE: MAC Control Element) in the medium access control (MAC: Medium Access Control) layer.
  • the RRC message is transmitted as an RRC PDU (Protocol Data Unit), and as the mapped logical channels, a common control channel (CCCH: Common Control Channel), an individual control channel (DCCH: Dedicated Control Channel), and a paging control channel (PCCH:).
  • a Paging Control Channel a Broadcast Control Channel (BCCH: Broadcast Control Channel), or a multicast control channel (MCCH: Multicast Control Channel) is used.
  • the MAC CE is transmitted as a MAC PDU (or MAC sub PDU).
  • a MAC subPDU is equivalent to a service data unit (SDU: ServiceDataUnit) in the MAC layer plus, for example, an 8-bit header, and a MAC PDU contains one or more MAC subPDUs.
  • SDU ServiceDataUnit
  • the physical channels and physical signals related to this embodiment will be described.
  • the physical broadcast channel (PBCH: Physical Broadcast Channel)
  • the primary synchronization signal (PrimarySynchronizationSignal)
  • the secondary synchronization signal (SecondarySynchronizationSignal)
  • a physical random access channel PRACH: Physical Random Access Channel
  • a physical downlink control channel PDCH: Physical Downlink Control Channel
  • a physical uplink shared channel PUSCH: Physical Uplink shared channel
  • Physical uplink control channel PUCCH: Physical Uplink Control Channel
  • physical downlink shared channel PDSCH: Physical Downlink Shared Channel
  • sounding reference signal SRS: Sounding Reference Signal
  • DMRS Demodulation
  • the physical broadcast channel PBCH is transmitted from the base station device to the terminal device and is used to notify common parameters (broadcast information, system information) in cells under the base station device.
  • System information is further classified into a master information block (MIB) and a system information block (System Information Block, SIB).
  • SIB System Information Block
  • the system information block is further subdivided into SIB1, SIB2, ..., And transmitted.
  • the system information includes information necessary for connecting to the cell.
  • the MIB includes information such as a system frame number and information indicating whether or not the cell can be camped.
  • SIB1 contains parameters for calculating cell quality (cell selection parameters), cell-common channel information (random access control information, PUCCH control information, PUSCH control information), scheduling information of other system information, and the like. include.
  • the primary sync signal PSS is used by the terminal device to synchronize the reception symbol timing and frequency of the downlink signal of the base station device.
  • the primary synchronization signal PSS is a signal that the terminal device first attempts to detect in a procedure for detecting a cell of a base station device (hereinafter, also referred to as a “cell search procedure”).
  • As the primary synchronization signal PSS three types of signals "0" to "2" are repeatedly used based on the physical cell ID.
  • the physical cell ID is a physical cell identifier, and 504 IDs are used in E-UTRA and 1008 IDs are used in NR.
  • the secondary sync signal SSS is used by the terminal device to detect the physical ID of the base station device.
  • the secondary synchronization signal SSS is a signal for the terminal device to detect the physical cell ID in the cell search procedure.
  • 168 types of signals from “0" to "167” are repeatedly used in E-UTRA, and 336 types of signals from “0" to "335" are repeatedly used in NR based on the physical cell ID.
  • FIG. 2 is a block diagram illustrating a schematic configuration of the base station apparatus 10 in one embodiment.
  • the base station device 10 has a coverage area expansion function capable of expanding a cell (cover area) for MTC (Machine Type Communication) applications such as a water meter buried in the ground.
  • MTC Machine Type Communication
  • the base station device 10 includes, for example, an antenna 21, a transmitting unit 22, a receiving unit 23, a storage unit 30, and a control unit 40. Further, the base station apparatus 10 further includes a bus 11 configured to transmit signals and data between the respective parts of the base station apparatus 10.
  • the antenna 21 is configured to be able to radiate (radiate) and receive radio waves (electromagnetic waves) in one or a plurality of predetermined frequency bands.
  • the antenna 21 may be non-directional, that is, omnidirectional.
  • the omnidirectional antenna 21 has approximately the same gain from all 360 degrees directions in the horizontal plane, in the vertical plane, or both in the horizontal plane and in the non-horizontal plane and in the vertical plane.
  • the base station device 10 may include a plurality of antennas.
  • the base station apparatus 10 may be divided into, for example, a transmitting antenna and a receiving antenna. Further, when a plurality of antennas are divided into a transmitting antenna and a receiving antenna, at least one of them may include a plurality of antennas.
  • a beamforming technique described later can be used.
  • the transmission unit 22 is connected to the antenna 21.
  • the transmission unit 22 is configured to generate a signal by encoding, modulating, multiplexing, and the like with respect to various information input from the control unit 40, and transmit the signal via the antenna 21.
  • the transmission unit 22 generates a downlink reference signal from information on the communication bandwidth used in the physical downlink specified by the control unit 40, and transmits the downlink reference signal to the terminal device 50 via the antenna 21.
  • the receiving unit 23 is connected to the antenna 21.
  • the receiving unit 23 is configured to restore information by performing separation, demodulation, compounding, and the like for various signals received via the antenna 21, and output the information to the control unit 40.
  • the receiving unit 23 measures the state of the uplink channel from the uplink signal received via the antenna 21, and outputs the measurement result information to the control unit 40.
  • the storage unit 30 is configured to store programs, data, and the like.
  • the storage unit 30 includes, for example, a hard disk drive, a solid state drive, and the like.
  • the storage unit 30 stores in advance various programs executed by the control unit 40, data necessary for executing the programs, and the like.
  • the control unit 40 is configured to control the operation of each unit of the base station device 10, such as the antenna 21, the transmission unit 22, the reception unit 23, and the storage unit 30. Further, the control unit 40 is configured to realize each function described later by executing a program stored in the storage unit 30 or the like.
  • the control unit 40 is, for example, a processor such as a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), a memory such as a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. And a buffer storage device such as a buffer.
  • control unit 40 includes, for example, a synchronization signal block generation unit 41 and a synchronization signal block transmission unit 42 as its functional configuration.
  • the synchronization signal block generation unit 41 is for generating a synchronization signal block.
  • the synchronization signal block is defined in NR as one unit in which the synchronization signal and the physical broadcast channel PBCH are combined.
  • the synchronization signal block generation unit 41 is configured to generate the synchronization signal block SSB, which will be described later.
  • the coverage area expansion function is on, the synchronization signal block generation unit 41 is configured to generate the first synchronization signal block SSB1 and the second synchronization signal block SSB2, which will be described later.
  • the synchronization signal block transmission unit 42 is for transmitting the generated synchronization signal block.
  • the synchronization signal block transmission unit 42 is configured to transmit the synchronization signal block SSB at predetermined intervals.
  • the coverage area expansion function is on, the synchronization signal block transmission unit 42 is configured to transmit the first synchronization signal block SSB1 and the second synchronization signal block SSB2 at predetermined intervals.
  • Each function of the control unit 40 can be realized by a program executed by a computer (microprocessor). Therefore, each function included in the control unit 40 can be realized by hardware, software, or a combination of hardware and software, and is not limited to any case.
  • control unit 40 when each function of the control unit 40 is realized by software or a combination of hardware and software, the processing can be executed by multitasking, multithreading, or both multitasking and multithreading. It is not limited to such a case.
  • FIG. 3 is a diagram for explaining the structure of the radio frame transmitted by the base station apparatus 10 in one embodiment.
  • the orthogonal frequency division multiplexing (OFDM: Orthogonal Frequency Division Duplex) is adopted as the modulation method.
  • the NR supports subcarrier intervals of 30, 60, 120 and 240 kHz in addition to the E-UTRA subcarrier interval of 15 kHz.
  • the subcarrier interval of 240 kHz is supported only by the synchronization signal block, and the subcarrier interval of 60 kHz is not supported by the synchronization signal block.
  • the radio frame has a length of 10 ms in the time axis direction, and is composed of 10 subframes sf1 to sf10.
  • Each of the subframes sf1 to sf10 has a length of 1 ms in the time axis direction and is composed of one or a plurality of slots. Specifically, when the subcarrier interval is 15 kHz, each subframe sf1 to sf10 includes one slot, and when the subcarrier interval is 30 kHz, each subframe sf1 to sf10 includes two slots and the subcarrier interval.
  • each subframe sf1 to sf10 When is 60 kHz, each subframe sf1 to sf10 includes 4 slots, and when the subcarrier spacing is 120 kHz, each subframe sf1 to sf10 contains 8 slots, and when the subcarrier spacing is 240 kHz, each sub The frames sf1 to sf10 include 16 slots. That is, the length of the slot in the time axis direction differs depending on the subcarrier interval. On the other hand, each slot is composed of 14 OFDM symbols sy1 to sy14 regardless of the subcarrier interval.
  • FIG. 4 is a configuration diagram illustrating the configuration of the synchronization signal block SSB transmitted by the base station apparatus 10 in one embodiment.
  • the synchronization signal block SSB includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH.
  • the synchronization signal block SSB is arranged in the order of the primary synchronization signal PSS, the physical notification channel PBCH, the secondary synchronization signal SSS, and the physical notification channel PBCH in the time axis direction, and the length in the time axis direction is the OFDM symbol. It is for one.
  • the primary synchronization signal PSS and the secondary synchronization signal SSS have a length of 12 resource blocks in the frequency axis direction
  • the physical broadcast channel PBCH has a length of 20 resource blocks in the frequency axis direction.
  • the physical broadcast channel PBCH in the synchronous signal block SSB includes a broadcast channel demodulation reference signal (DRMS for SBCH).
  • the broadcast channel demodulation reference signal is a signal for the receiving terminal device to measure the radio channel state for the purpose of demodulating the physical broadcast channel PBCH.
  • FIG. 5 is a diagram for explaining beam sweeping performed by the base station apparatus 10 in one embodiment.
  • the base station device 10 employs beamforming in order to secure the communicable distance and area between the base station device 10 and the terminal device 50.
  • Beamforming is a technique for forming a directional pattern or a directional beam by controlling the amplitude and phase of each of a plurality of antennas to increase or decrease the gain (gain) of the antenna in a specific direction.
  • Beamforming it is possible to concentrate the signal strength of the transmission signal (transmission beam) in a specific direction and extend the communication distance.
  • the signal strength is lowered in a direction other than the specific direction, the reachable range of the transmitted signal is narrowed.
  • the base station apparatus 10 switches in, for example, eight directions to transmit a transmission signal.
  • the terminal device UE 1 receives the maximum signal strength when the transmission beam in the second direction is transmitted from the base station device 10. Further, the terminal device UE 2 receives the maximum signal strength when the transmission beam in the eighth direction from the base station device 10 is transmitted.
  • FIG. 6 is a diagram for explaining an example of a predetermined period of the synchronization signal block SSB transmitted by the base station apparatus 10 in one embodiment.
  • the synchronous signal block SSB is transmitted twice the length of the radio frame in the time axis direction, that is, in a cycle of 20 ms. Further, in the NR, the OFDM symbol which is a transmission candidate of the synchronization signal block SSB in the half of the length of the radio frame in the time axis direction (hereinafter referred to as “half frame”) in the period of 20 ms, that is, in the period of 5 ms. The position of is specified.
  • the synchronization signal block SSB is transmitted up to L times (pieces) within this half frame.
  • the maximum number of transmissions L of this synchronization signal block SSB differs depending on the transmission frequency and the subcarrier interval (SCS). As shown in FIG. 6, when the transmission frequency is 3 GHz or more and less than 6 GHz and the subcarrier interval is 15 kHz (Case A in FIG. 6), the maximum number of transmissions L is 8. Similarly, when the transmission frequency is 2.4 GHz or less and the subcarrier interval is 30 kHz (Case B in FIG. 6), the maximum number of transmissions L is 4, the transmission frequency is 2.4 GHz or more and less than 6 GHz, and the subcarrier interval is. When it is 30 kHz (Case C in FIG.
  • the maximum number of transmissions L is 8, and when the transmission frequency is 6 GHz or more and the subcarrier interval is 120 kHz (Case D in FIG. 6), the maximum number of transmissions L is 64. When the transmission frequency is 6 GHz or more and the subcarrier interval is 240 kHz (Case E in FIG. 6), the maximum number of transmissions L is 64.
  • the arrangement of the synchronization signal block SSB in the slot will be described later.
  • the number in parentheses after the synchronization signal block SSB is the index value.
  • the index is information for the terminal device 50 to identify the synchronization signal block SSB that can be transmitted a plurality of times.
  • the index is included in the physical broadcast channel PBCH in the synchronization signal block SSB.
  • the index is given a value from “0” to “7”, for example.
  • the terminal apparatus 50 uses the index included in the physical broadcast channel PBCH of the synchronization signal block SSB to transmit and transmit which of the plurality of transmitted signals. Identify if it was received.
  • the numbers in parentheses after the synchronization signal block SSB, the first synchronization signal block SSB1, or the second synchronization signal block SSB2 indicate the index value.
  • FIG. 7 is a diagram for explaining an example of arrangement of the synchronization signal block SSB transmitted by the base station apparatus 10 in one embodiment in the slot.
  • the subcarrier interval is 15 kHz, which corresponds to Case A in FIG.
  • the subcarrier interval when the subcarrier interval is 15 kHz, it is composed of 1 ms, that is, one slot per subframe, and each slot has 14 OFDM symbol numbers “0” to “13”. Contains OFDM symbols.
  • a synchronous signal block SSB (0) is arranged at the OFDM symbol number “2” and a synchronous signal block SSB (1) is arranged at the OFDM symbol number “8”.
  • the synchronous signal block SSB (0) and the synchronous signal block SSB (1) each occupy four OFDM symbols.
  • OFDM symbols from OFDM symbol number "0" are reserved for the physical downlink control channel PDCCH
  • OFDM symbol of OFDM symbol number "6” is a non-transmission section (Guard Period) and physical uplink. Reserved for the link control channel PUCCH.
  • the OFDM symbol of OFDM symbol number "7” is reserved for the physical downlink control channel PDCCH
  • the two OFDM symbols from OFDM symbol number "12” are the non-transmission section and the physical uplink control channel PUCCH. Reserved for.
  • synchronization signal block SSBs having different indexes occupy a large number of OFDM symbols, and synchronization signal block SSBs having the same index, for example, synchronization signal block SSB (0) are used a plurality of times. There is little space for OFDM symbols to transmit. It should be noted that such a situation is not limited to the example shown in FIG. Since the same applies to Case B, Case C, Case D, and Case E shown in FIG. 6, the illustration and description thereof will be omitted.
  • the base station device 10 of the present invention has a coverage area expansion function.
  • the synchronization signal block generation unit 41 When the coverage area extension function is off, the synchronization signal block generation unit 41 generates the synchronization signal block SSB shown in FIG. 4, and the synchronization signal block transmission unit 42 generates the generated synchronization signal block SSB at predetermined intervals. Send.
  • the synchronization signal block generation unit 41 when the coverage area extension function is on, the synchronization signal block generation unit 41 generates the first synchronization signal block SSB1 and the second synchronization signal block SSB2, and the synchronization signal block transmission unit 42 is generated.
  • the first synchronization signal block SSB1 and the second synchronization signal block SSB2 are arranged at predetermined positions in the half frame and transmitted at predetermined intervals.
  • FIG. 8 is a diagram for explaining an example of the coverage area expansion function of the base station apparatus 10 in one embodiment.
  • FIG. 9 is a diagram for explaining another example of the coverage area expansion function of the base station apparatus 10 in one embodiment.
  • FIG. 10 is a configuration diagram showing a first example of the configuration of the second synchronization signal block SSB2 transmitted by the base station apparatus 10 in one embodiment.
  • FIG. 11 is a configuration diagram showing a second example of the configuration of the second synchronization signal block SSB2 transmitted by the base station apparatus 10 in one embodiment.
  • FIG. 12 is a configuration diagram showing a third example of the configuration of the second synchronization signal block SSB2 transmitted by the base station apparatus 10 in one embodiment.
  • FIG. 13 is a configuration diagram showing a fourth example of the configuration of the second synchronization signal block SSB2 transmitted by the base station apparatus 10 in one embodiment.
  • the subcarrier interval is 15 kHz, which corresponds to Case A in FIG. 6, and in the example shown in FIG. 9, the subcarrier interval is 30 kHz, which corresponds to Case B in FIG.
  • the synchronous signal block SSB (0) and the synchronous signal block which have the same configuration but different indexes, respectively.
  • the SSB (1) and the synchronization signal block SSB (2) are generated.
  • the sync signal block SSB (0) is located at the OFDM symbol number "2" in the first slot
  • the sync signal block SSB (1) is located at the OFDM symbol number "8" in the first slot
  • the sync signal block SSB (1) is located.
  • (2) is arranged in the OFDM symbol number "2" of the second slot.
  • the half frames shown in FIG. 6 arranged in this way are transmitted every 20 ms.
  • the first synchronization signal block SSB1 (0) and the second synchronization signal block SSB2 (0) are generated.
  • the first sync signal block SSB1 (0) is located at the OFDM symbol number "2" in the first slot
  • the second sync signal block SSB2 (0) is the OFDM symbol number "8" in the first slot and the second. It is arranged at the OFDM symbol number "2" of the slot.
  • the second synchronization signal block SSB2 (0) has an OFDM symbol number “8” in the second slot, an OFDM symbol number “2” in the third slot, and an OFDM symbol in the third slot. It is also arranged in the number "8", the OFDM symbol number "2" in the fourth slot, and the OFDM symbol number "8” in the fourth slot.
  • Half frames arranged in this way are transmitted every 20 ms.
  • the synchronous signal block SSB (0) and the synchronous signal block which have the same configuration but different indexes, respectively.
  • An SSB (1), a sync signal block SSB (2), and a sync signal block SSB (3) are generated.
  • the sync signal block SSB (0) is located at the OFDM symbol number "4" in the first slot
  • the sync signal block SSB (1) is located at the OFDM symbol number "8" in the first slot
  • the sync signal block SSB (1) is located.
  • (2) is arranged in the OFDM symbol number “2” of the second slot
  • the synchronization signal block SSB (3) is arranged in the OFDM symbol number “6” of the second slot.
  • Half frames arranged in this way are transmitted every 20 ms.
  • the first synchronization signal block SSB1 (0) and the second synchronization signal block SSB2 (0) are generated.
  • the first sync signal block SSB1 (0) is located at the OFDM symbol number "4" in the first slot
  • the second sync signal block SSB2 (0) is the OFDM symbol number "9" in the first slot and the second. It is arranged in the OFDM symbol number "3" of the slot and the OFDM symbol number "7" of the second slot.
  • Half frames arranged in this way are transmitted every 20 ms.
  • the first synchronization signal block SSB1 includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a physical broadcast channel PBCH. That is, since the configuration of the first synchronization signal block SSB1 is the same as the configuration of the synchronization signal block SSB shown in FIG. 4, the illustration and description thereof will be omitted.
  • the second synchronization signal block SSB2 includes a secondary synchronization signal SSS and a physical broadcast channel PBCH. That is, unlike the synchronization signal block SSB and the first synchronization signal block SSB1, the second synchronization signal block SSB2 does not include the primary synchronization signal PSS. As described above, since the first synchronization signal block SSB1 includes the primary synchronization signal PSS and the second synchronization signal block SSB2 does not include the primary synchronization signal PSS, the first synchronization signal block SSB1 and the second synchronization signal block SSB2 are combined.
  • the terminal device 50 can receive the physical broadcast channel PBCH redundantly, which is easy. Can be detected. Therefore, the terminal device 50 can initially access the base station device 10 which could not be cell-detected (cell search) because the signal-to-noise ratio (SNR) was insufficient in the past, and is different from the conventional one.
  • the coverage area can be extended in different ways.
  • the second synchronization signal block SSB2 is arranged in the order of the physical notification channel PBCH, the secondary synchronization signal SSS, and the physical notification channel PBCH in the time axis direction, and the length in the time axis direction is one OFDM symbol. Is. Therefore, the second synchronization signal block SSB2 occupies three OFDM symbols.
  • the synchronization signal block generation unit 41 copies the physical broadcast channel PBCH, the secondary sync signal SSS, and the physical broadcast channel PBCH in the first sync signal block SSB1 to generate the second sync signal block SSB2.
  • the secondary synchronization signal SSS of the second synchronization signal block SSB2 has a length of 12 resource blocks in the frequency axis direction
  • the physical broadcast channel PBCH of the second synchronization signal block SSB2 has a length of 20 in the frequency axis direction. It is a resource block.
  • the physical broadcast channel PBCH in the second synchronization signal block SSB2 includes a reference signal for demodulation of the broadcast channel.
  • the index corresponding to the physical notification channel PBCH of the second synchronization signal block SSB2 is the same as the index corresponding to the physical notification channel PBCH of the first synchronization signal block SSB1.
  • the index of the first synchronization signal block SSB1 and the index of the second synchronization signal block SSB2 are the same, that is, the same information is transmitted by the SSB1 and the SSB2, so that the coverage area expansion function of the base station apparatus 10 is turned on.
  • the / off can be easily determined, and the processing of the terminal device 50, for example, the demodulation processing can be simplified.
  • a plurality of second synchronization signal blocks SSB2 (0) are transmitted at intervals of 20 ms, but the present invention is not limited to this.
  • the second synchronization signal block SSB2 (0) may be transmitted at least once every 20 ms cycle. However, it is preferable that the second synchronization signal block SSB2 is transmitted as many times as possible. For example, when the second synchronization signal block SSB2 is transmitted once, the signal strength in the coverage area is improved by 3 dB, and when the second synchronization signal block SSB2 is transmitted twice, the signal strength in the coverage area is 4. The signal strength in the coverage area is improved by 7 dB when the second synchronous signal block SSB2 is transmitted three times.
  • the configuration of the second synchronization signal block SSB2 is not limited to the example shown in FIG.
  • the second synchronization signal block SSB2 may have another configuration as long as the primary synchronization signal PSS is not included.
  • the second synchronization signal block SSB2a includes a secondary synchronization signal SSS and a physical broadcast channel PBCH.
  • the second synchronization signal block SSB2a includes the physical broadcast channel PBCH in the area of the second synchronization signal block SSB2a corresponding to the area assigned to the primary synchronization signal PSS in the first synchronization signal block SSB1. That is, the second synchronization signal block SSB2a is arranged in the order of the physical notification channel PBCH, the physical notification channel PBCH, the secondary synchronization signal SSS, and the physical notification channel PBCH in the time axis direction, and each has a length in the time axis direction. Is one OFDM symbol.
  • the second synchronization signal block SSB2a occupies four OFDM symbols.
  • the synchronization signal block generation unit 41 copies the physical notification channel PBCH, the secondary synchronization signal SSS, and the physical notification channel PBCH in the first synchronization signal block SSB1 to the second and third in the time axis direction of the second synchronization signal block SSB2a. Place it on the third and fourth OFDM symbols. Then, the synchronization signal block generation unit 41 copies the physical broadcast channel PBCH arranged in the second OFDM symbol and arranges it in the first OFDM symbol to generate the second synchronization signal block SSB2a.
  • the index included in the physical broadcast channel PBCH of the second synchronization signal block SSB2a is the same as the index included in the physical broadcast channel PBCH of the first sync signal block SSB1.
  • the physical broadcast channel PBCH in the second synchronization signal block SSB2a includes a reference signal for demodulation of the broadcast channel.
  • the second synchronization signal block SSB2a includes the physical broadcast channel PBCH in the area of the second synchronization signal block SSB2a corresponding to the area assigned to the primary synchronization signal PSS in the first synchronization signal block SSB1.
  • the terminal device 50 can more easily detect the physical broadcast channel PBCH.
  • the second synchronization signal block SSB2b is configured to include the physical notification channel PBCH. That is, unlike the synchronization signal block SSB and the first synchronization signal block SSB1, the second synchronization signal block SSB2b does not include the secondary synchronization signal SSS.
  • the second synchronization signal block SSB2b is arranged in the order of the physical notification channel PBCH, a part of the physical notification channel PBCH, and the physical notification channel PBCH in the time axis direction, and the length in the time axis direction is the OFDM symbol. It is for one. Therefore, the second synchronization signal block SSB2a occupies three OFDM symbols.
  • the synchronization signal block generation unit 41 copies the physical notification channel PBCH, the secondary synchronization signal SSS, and the physical notification channel PBCH in the first synchronization signal block SSB1 to the second and third in the time axis direction of the second synchronization signal block SSB2a. Place it on the third and fourth OFDM symbols. Then, the synchronization signal block generation unit 41 deletes the data of the 12 resource blocks assigned to the secondary synchronization signal SSS among a part of the secondary synchronization signal SSS and the physical broadcast channel PBCH arranged in the third OFDM symbol. Generate the second sync signal block SSB2b.
  • the index included in the physical broadcast channel PBCH of the second synchronization signal block SSB2b is the same as the index included in the physical broadcast channel PBCH of the first sync signal block SSB1. Further, the physical broadcast channel PBCH in the second synchronization signal block SSB2b includes a reference signal for demodulation of the broadcast channel.
  • the first synchronization signal block SSB1 includes the secondary synchronization signal SSS and the second synchronization signal block SSB2b does not include the secondary synchronization signal SSS
  • the first synchronization signal block SSB1 and the second synchronization signal block SSB2b Can be easily distinguished, and it is possible to further prevent the terminal device 50 from erroneously detecting the second synchronization signal block SSB2b as the first synchronization signal block SSB1.
  • the second synchronization signal block SSB2c is configured to include the physical broadcast channel PBCH.
  • the second synchronization signal block SSB2c includes the physical broadcast channel PBCH in the area of the second synchronization signal block SSB2c corresponding to the area assigned to the secondary synchronization signal SSS in the first synchronization signal block SSB1. That is, the second synchronization signal block SSB2c is arranged in the order of the physical notification channel PBCH, the physical notification channel PBCH, and the physical notification channel PBCH in the time axis direction, and the length in the time axis direction is 1 of the OFDM symbol. It is for each piece.
  • the second sync signal block SSB2c occupies three OFDM symbols.
  • the synchronization signal block generation unit 41 copies the physical notification channel PBCH, the secondary synchronization signal SSS, and the physical notification channel PBCH in the first synchronization signal block SSB1 and copies the first and second in the time axis direction of the second synchronization signal block SSB2c. Place it on the third and third OFDM symbols. Then, the synchronization signal block generation unit 41 copies the physical broadcast channel PBCH arranged in the first OFDM symbol and arranges it in the second OFDM symbol to overwrite the secondary synchronization signal SSS, and the second synchronization signal block SSB2c. To generate.
  • the index included in the physical broadcast channel PBCH of the second synchronization signal block SSB2c is the same as the index included in the physical broadcast channel PBCH of the first sync signal block SSB1.
  • the physical broadcast channel PBCH in the second synchronization signal block SSB2c includes a reference signal for demodulation of the broadcast channel.
  • the physical broadcast channel PBCH is included in the region of the second synchronization signal block SSB2c corresponding to the region in which the second synchronization signal block SSB2c is assigned to the secondary synchronization signal SSS in the first synchronization signal block SSB1.
  • the terminal device 50 can more easily detect the physical broadcast channel PBCH.
  • FIG. 14 is a diagram for explaining an example of a predetermined period of the first synchronous signal block SSB1 and the second synchronous signal block SSB2 transmitted by the base station apparatus 10 in one embodiment.
  • the maximum number of transmissions L is defined as 4, but there is a 4 ms interval in the half frame. There is. Further, as shown in Case C of FIG. 6, when the transmission frequency is 2.4 GHz or more and less than 6 GHz and the subcarrier interval is 30 kHz, the maximum number of transmissions L is defined as 8, but 3 ms in a half frame. The section is vacant.
  • the synchronization signal block generation unit 41 When the transmission frequency is 2.4 GHz or less and the subcarrier interval is 30 kHz (Case B in FIG. 14), when the coverage area expansion function is on, the synchronization signal block generation unit 41 The first synchronous signal block SSB1 (0), the first synchronous signal block SSB1 (1), the first synchronous signal block SSB1 (2), and the first synchronous signal block, which have the same configuration but different indexes, respectively. Generate SSB1 (3).
  • the synchronization signal block transmission unit 42 includes these first synchronization signal block SSB1 (0), first synchronization signal block SSB1 (1), first synchronization signal block SSB1 (2), and first synchronization signal block SSB1 (3).
  • the synchronization signal block generation unit 41 includes a first synchronization signal block SSB1 (0), a first synchronization signal block SSB1 (1), a first synchronization signal block SSB1 (2), and a first synchronization signal block SSB1 ( Based on 3), the second synchronization signal block SSB2 (0), the second synchronization signal block SSB2 (1), the second synchronization signal block SSB2 (2), and the second synchronization signal block SSB2 (3) are generated. ..
  • the synchronization signal block generation unit 41 generates the second synchronization signal block SSB2 (0) from the first synchronization signal block SSB1 (0) as described with reference to FIG. Therefore, the index of the second synchronization signal block SSB2 (0) is the same as the index of the first synchronization signal block SSB1 (0).
  • the synchronization signal block transmission unit 42 includes these second synchronization signal block SSB2 (0), second synchronization signal block SSB2 (1), second synchronization signal block SSB2 (2), and second synchronization signal block SSB2 (3). ) Are placed at the positions of the predetermined OFDM symbols of the subsequent 1 ms, that is, the second, third, fourth, and fifth subframes.
  • the synchronization signal block generator 41 when the transmission frequency is 2.4 GHz or more and less than 6 GHz and the subcarrier interval is 30 kHz (Case C in FIG. 14), when the coverage area expansion function is on, the synchronization signal block generator 41 has the same configuration.
  • Synchronous signal block SSB1 (4), first synchronous signal block SSB1 (5), first synchronous signal block SSB1 (6), and first synchronous signal block SSB1 (7) are generated.
  • the synchronization signal block transmission unit 42 includes these first synchronization signal block SSB1 (0), first synchronization signal block SSB1 (1), first synchronization signal block SSB1 (2), and first synchronization signal block SSB1 (3).
  • the first synchronization signal block SSB1 (4), the first synchronization signal block SSB1 (5), the first synchronization signal block SSB1 (6), and the first synchronization signal block SSB1 (7) are each set to the first 2 ms, that is, Place it at the position of a given OFDM symbol in the first and second subframes.
  • the synchronization signal block generation unit 41 includes a first synchronization signal block SSB1 (0), a first synchronization signal block SSB1 (1), a first synchronization signal block SSB1 (2), and a first synchronization signal block SSB1 (3).
  • the second sync signal based on the first sync signal block SSB1 (4), the first sync signal block SSB1 (5), the first sync signal block SSB1 (6), and the first sync signal block SSB1 (7).
  • the block SSB2 (5), the second synchronization signal block SSB2 (6), and the second synchronization signal block SSB2 (7) are generated.
  • the synchronization signal block generation unit 41 generates the second synchronization signal block SSB2 (7) from the first synchronization signal block SSB1 (7) as described with reference to FIG. Therefore, the index of the second synchronization signal block SSB2 (7) is the same as the index of the first synchronization signal block SSB1 (7).
  • the synchronization signal block transmission unit 42 includes these second synchronization signal block SSB2 (0), second synchronization signal block SSB2 (1), second synchronization signal block SSB2 (2), second synchronization signal block SSB2 (3), and the like.
  • the second synchronization signal block SSB2 (4), the second synchronization signal block SSB2 (5), the second synchronization signal block SSB2 (6), and the second synchronization signal block SSB2 (7) are each set to the next 2 ms, that is, Place it at the position of a given OFDM symbol in the 3rd and 4th subframes.
  • the base station apparatus 10 can realize the coverage area expansion function while performing the beam sweeping described with reference to FIG.
  • FIG. 15 is a block diagram illustrating a schematic configuration of the terminal device 50 in one embodiment.
  • the terminal device 50 includes, for example, an antenna 61, a transmitting unit 62, a receiving unit 63, a storage unit 70, and a control unit 80. Further, the terminal device 50 further includes a bus 51 configured to transmit signals and data between each part of the terminal device 50.
  • the antenna 61 is configured to be able to radiate (radiate) and receive radio waves (electromagnetic waves) in one or a plurality of predetermined frequency bands.
  • the antenna 61 may be non-directional, that is, omnidirectional.
  • the omnidirectional antenna 61 has approximately the same gain from all 360 degrees directions in the horizontal plane, in the vertical plane, or both in the horizontal plane and in the non-horizontal plane and in the vertical plane.
  • the number of antennas 61 included in the terminal device 50 is not limited to one.
  • the terminal device 50 may include a plurality of antennas. When the terminal device 50 includes a plurality of antennas, it may be divided into, for example, a transmitting antenna and a receiving antenna. Further, when a plurality of antennas are divided into a transmitting antenna and a receiving antenna, at least one of them may include a plurality of antennas.
  • the transmission unit 62 is connected to the antenna 61.
  • the transmission unit 62 is configured to generate a signal by encoding, modulating, multiplexing, and the like with respect to various information input from the control unit 80, and transmit the signal via the antenna 61.
  • the transmission unit 62 generates a physical uplink signal from the information regarding the communication bandwidth used in the physical uplink specified by the control unit 80, and transmits it to the base station apparatus 10 via the antenna 61.
  • the receiving unit 63 is connected to the antenna 61.
  • the receiving unit 63 is configured to restore information by performing separation, demodulation, compounding, and the like for various signals received via the antenna 61, and output the information to the control unit 80.
  • the storage unit 70 is configured to store programs, data, and the like.
  • the storage unit 70 includes, for example, a hard disk drive, a solid state drive, and the like.
  • the storage unit 70 stores in advance various programs executed by the control unit 80, data necessary for executing the programs, and the like. Further, the storage unit 70 stores the cell IDs of the base station devices 10 in the vicinity that do not have the coverage area expansion function.
  • the cell ID of the base station device that does not have the coverage area expansion function is, for example, the cell ID that was previously acquired when the terminal device 50 previously made an RRC connection with the base station device that does not have the coverage area expansion function.
  • the control unit 80 is configured to control the operation of each unit of the terminal device 50, such as the antenna 61, the transmission unit 62, the reception unit 63, and the storage unit 70. Further, the control unit 80 is configured to realize each function described later by executing a program stored in the storage unit 70 or the like.
  • the control unit 80 includes, for example, a CPU, a processor such as an ASIC and an FPGA, a memory such as a ROM and a RAM, and a buffer storage device such as a buffer.
  • control unit 80 includes, for example, a synchronization signal block receiving unit 81, a cell ID detection unit 82, a restoration determination unit 83, a physical notification channel restoration unit 84, and a cell detection unit 85 as its functional configuration. Be prepared.
  • the synchronization signal block receiving unit 81 is configured to receive the first synchronization signal block SSB1 and the second synchronization signal block SSB2 from the base station apparatus 10.
  • the cell ID detection unit 82 is configured to detect the cell ID of the base station apparatus 10 based on the primary synchronization signal PSS and the secondary synchronization signal SSS in the first synchronization signal block SSB1.
  • the cell ID detection unit 82 has three types of signals included in the primary synchronization signal PSS of the first synchronization signal block SSB1 and 336 types of signals included in the secondary synchronization signal SSS of the first synchronization signal block SSB1. The cell ID is identified and detected by the combination with.
  • the restoration determination unit 83 is configured to determine whether or not to restore the physical notification channel PBCH based on the detected cell ID.
  • the restoration determination unit 83 compares the detected cell ID with the cell ID of the base station device that does not have the coverage area expansion function of the storage unit 70, and if they do not match, the physical notification is given. It is determined that the restoration of the channel PBCH is performed, and if the two match, it is determined that the physical notification channel PBCH is not restored.
  • the detected cell ID is the cell of the base station apparatus that does not have the coverage area expansion function. Since it is not necessary to restore the physical notification channel PBCH when the ID matches, the power consumption of the terminal device 50 can be reduced.
  • the physical broadcast channel restoration unit 84 is configured to synthesize the physical broadcast channel PBCH in the first synchronization signal block SSB1 and the physical broadcast channel PBCH in the second sync signal block SSB2 to restore the physical broadcast channel PBCH. ..
  • the physical notification channel PBCH of the first synchronization signal block SSB1 and the physical notification channel PBCH of the second synchronization signal block SSB2 is synthesized by performing an averaging process for calculating the average of the signal block SSB2 with the physical broadcast channel PBCH.
  • the calculated average is not limited to the simple average, and for example, a weighted average or a moving average may be obtained.
  • the first synchronization signal block SSB1 and the physical notification channel PBCH in the second synchronization signal block SSB2 can be reduced, and the restored physical broadcast channel PBCH has an improved S / N ratio. Therefore, the signal strength of the physical broadcast channel PBCH can be improved, and the coverage area can be improved.
  • the cell detection unit 85 is configured to detect the cell of the base station apparatus 10 based on the first synchronization signal block SSB1 and the second synchronization signal block SSB2.
  • the terminal device 50 since the first synchronization signal block SSB1 includes the primary synchronization signal PSS and the second synchronization signal block SSB2 does not include the primary synchronization signal PSS, the terminal device 50 has the first synchronization signal block SSB1 and the second synchronization signal. It is possible to distinguish it from the block SSB2, and it is possible to avoid erroneously detecting that the second synchronization signal block SSB2 is the first synchronization signal block SSB1 and failing in frame synchronization. Further, since the first synchronous signal block SSB1 includes the physical broadcast channel PBCH and the second synchronous signal block SSB2 includes the physical broadcast channel PBCH, the terminal device 50 can receive the physical broadcast channel PBCH redundantly, which is easy.
  • the terminal device 50 can detect the base station device 10 that could not be cell-detected (cell search) because the signal band noise power ratio was insufficient in the past, and the coverage area can be detected by a method different from the conventional method. Can be extended.
  • Each function of the control unit 80 can be realized by a program executed by a computer (microprocessor). Therefore, each function included in the control unit 80 can be realized by hardware, software, or a combination of hardware and software, and is not limited to any case.
  • control unit 80 when each function of the control unit 80 is realized by software or a combination of hardware and software, the processing can be executed by multitasking, multithreading, or both multitasking and multithreading. It is not limited to such a case.
  • FIG. 16 is a time chart for explaining an example of the operation of the base station device 10 and the terminal device 50 in one embodiment.
  • the synchronization signal block generation unit 41 When the coverage area extension function is on, first, in the base station apparatus 10, the synchronization signal block generation unit 41 generates the first synchronization signal block SSB1 and the second synchronization signal block SSB2, as shown in FIG. Step S201).
  • the synchronization signal block transmission unit 42 arranges the generated first synchronization signal block SSB1 and second synchronization signal block SSB2 at predetermined positions in the half frame, and transmits them every 20 ms cycle (step S202). ..
  • the synchronization signal block receiving unit 81 receives the first synchronization signal block SSB1 and the second synchronization signal block SSB2 included in the half frame transmitted from the base station device 10 (step S203).
  • the cell detection unit 85 detects the cell of the base station apparatus 10 based on the first synchronization signal block SSB1 and the second synchronization signal block SSB2 included in the received half frame (step S204).
  • the physical notification channel restoration unit 84 Before detecting the cell of the base station apparatus 10, the physical notification channel restoration unit 84 synthesizes the physical notification channel PBCH in the first synchronization signal block SSB1 and the physical notification channel PBCH in the second synchronization signal block SSB2. The physical notification channel PBCH may be restored.
  • step S204 an RRC connection is established between the base station device 10 and the terminal device 50.
  • the present invention is not limited thereto.
  • the present invention is not only applicable to relatively short-cycle processing (procedure), but also relatively long-cycle processing after RRC connection, for example, handover processing, frequency band change processing, and the like. It can also be applied to frequency band addition processing such as carrier aggregation.
  • the first synchronization signal block SSB1 includes the primary synchronization signal PSS
  • the second synchronization signal block SSB2 does not include the primary synchronization signal PSS. It becomes possible to distinguish between the synchronization signal block SSB1 and the second synchronization signal block SSB2, and the terminal device 50 erroneously detects that the second synchronization signal block SSB2 is the first synchronization signal block SSB1, resulting in frame synchronization. You can avoid failing.
  • the terminal device 50 can receive the physical broadcast channel PBCH redundantly, which is easy. Can be detected. Therefore, for example, the terminal device 50 can initially access the terminal device 50, which could not be cell-detected (cell search) because the signal band noise power ratio was insufficient in the past, and covered by a method different from the conventional method. The area can be expanded.
  • the first synchronization signal block SSB1 includes the primary synchronization signal PSS
  • the second synchronization signal block SSB2 does not include the primary synchronization signal PSS.
  • the device 50 can distinguish between the first synchronization signal block SSB1 and the second synchronization signal block SSB2, and erroneously detects that the second synchronization signal block SSB2 is the first synchronization signal block SSB1 and frame synchronization. You can avoid failing.
  • the terminal device 50 can receive the physical broadcast channel PBCH redundantly, which is easy. Can be detected. Therefore, the terminal device 50 can detect the base station device 10 that could not be cell-detected (cell search) because the signal band noise power ratio was insufficient in the past, and the coverage area can be detected by a method different from the conventional method. Can be extended.
  • PBCH physical broadcast channel
  • PDCCH physical downlink control channel
  • PSS primary sync signal
  • PUCCH physical uplink control channel
  • SCS subcarrier interval
  • SSB sync signal block
  • SSB1 first sync signal block
  • SSB2 SSB2a
  • SSB2b SSB2c
  • Second synchronization signal block SSS ... Secondary synchronization signal, UE1, UE2 ... Terminal device.

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

Abstract

L'invention concerne un dispositif de station de base, un dispositif terminal et un procédé de communication sans fil pouvant élargir une zone de couverture au moyen d'un procédé différent des procédés classiques.　Ce dispositif de station de base (10) comprend : une unité de génération de bloc de signal de synchronisation (41) qui génère un premier bloc de signal de synchronisation (SSB1) et un second bloc de signal de synchronisation (SSB2) ; et une unité de transmission de bloc de signal de synchronisation (42) qui transmet le premier bloc de signal de synchronisation (SSB1) et le second bloc de signal de synchronisation (SSB2) pour chaque cycle prédéterminé, le premier bloc de signal de synchronisation (SSB1) comprenant un signal de synchronisation primaire (PSS) et un canal de diffusion physique (PBCH), et le second bloc de signal de synchronisation (SSB2) comprenant le canal de diffusion physique (PBCH) et ne comprenant pas le signal de synchronisation primaire (PSS).
PCT/JP2019/010825 2019-03-15 2019-03-15 Dispositif de station de base, dispositif terminal, et procédé de communication sans fil WO2020188628A1 (fr)

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WO2023007724A1 (fr) * 2021-07-30 2023-02-02 株式会社Ｎｔｔドコモ Terminal, procédé de communication radio et station de base

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