WO2022113809A1 - 通信装置、通信方法、基地局、及び基地局の方法 - Google Patents
通信装置、通信方法、基地局、及び基地局の方法 Download PDFInfo
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
- H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
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- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
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- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- This disclosure relates to communication devices, communication methods, base stations, and base station methods.
- IAB Integrated Access and Backhaul link
- RF Repeater Integrated Access and Backhaul link
- IABs are classified as Layer 3 relays (or regenerative relays).
- Layer 3 relays or regenerative relays.
- all packets at the relay node need to be decoded up to layer 3 and then all re-encoded for transmission to the forwarding destination. It costs money to implement such a complicated function (e.g., a function equivalent to a base station).
- the above-mentioned RF Repeater is also referred to as a layer 1 relay.
- Non-Patent Document 1 discloses Smart Repeater. In Smart Repeater, control information can be communicated in the front hall between the base station and the base station. As a result, it is said that substantial performance improvement (substantial performance advantages) for RF Repeater can be obtained.
- Non-Patent Document 1 does not disclose details such as the contents and procedures of control information in the front hall between the base station and the Smart Repeater. Therefore, there is a possibility that the performance improvement for RF Repeater cannot be sufficiently obtained.
- one form of communication device is a communication device that relays communication between a base station and a terminal device, and is used for controlling the physical layer of the communication device. Based on the receiving unit that receives the physical control signal from the base station and the information about the beam, which is a physical control signal and includes information about the beam used for communication between the communication device and the terminal device. A communication control unit for controlling a beam used for communication between the communication device and the terminal device is provided.
- a plurality of components having substantially the same functional configuration may be distinguished by adding different numbers after the same reference numerals.
- a plurality of configurations having substantially the same functional configuration are distinguished as required , such as terminal devices 40 1 , 402 , and 403.
- terminal devices 40 1 , 402 , and 403. are simply referred to as the terminal device 40.
- Each of one or more embodiments (including examples and modifications) described below can be implemented independently. On the other hand, at least a part of the plurality of embodiments described below may be carried out in combination with at least a part of other embodiments as appropriate. These plurality of embodiments may contain novel features that differ from each other. Therefore, these plurality of embodiments may contribute to solving different purposes or problems, and may have different effects.
- LTE and NR are a kind of cellular communication technology, and enable mobile communication of a terminal device by arranging a plurality of areas covered by a base station in a cell shape. At this time, a single base station may manage a plurality of cells.
- RAT Radio Access Technology
- LTE and NR are a kind of cellular communication technology, and enable mobile communication of a terminal device by arranging a plurality of areas covered by a base station in a cell shape. At this time, a single base station may manage a plurality of cells.
- LTE includes LTE-A (LTE-Advanced), LTE-A Pro (LTE-Advanced Pro), and EUTRA (Evolved Universal Terrestrial Radio Access).
- NR shall include NLAT (New Radio Access Technology) and FEUTRA (Further EUTRA).
- a single base station may manage a plurality of cells.
- the cell corresponding to LTE may be referred to as an LTE cell
- the cell corresponding to NR may be referred to as an NR cell.
- NR is the next generation (fifth generation) wireless access technology (RAT) of LTE.
- RAT wireless access technology
- NR is a wireless access technology that can support various use cases including eMBB (Enhanced Mobile Broadband), mMTC (Massive Machine Type Communications) and URLLC (Ultra-Reliable and Low Latency Communications).
- eMBB Enhanced Mobile Broadband
- mMTC Massive Machine Type Communications
- URLLC Ultra-Reliable and Low Latency Communications
- NR beam operation method in the present embodiment In NR, two types of methods, a single beam operation method and a multiple beam operation method, are assumed.
- FIG. 1 is a diagram showing an example of a single beam operation method.
- the single beam operation method is a method in which a predetermined cell coverage is operated by one beam (e.g., omnidirectional beam).
- a cell-specific physical channel or signal is transmitted in one beam within a given cell coverage.
- LTE can be regarded as a single beam operation method.
- FIG. 2 is a diagram showing an example of a multiple beam operation method.
- the multiple beam operation method is a method in which a predetermined cell coverage is operated by one or more beams (e.g., directional beam).
- a cell-specific physical channel or physical signal is transmitted by a plurality of beams within a predetermined cell coverage.
- a communication device for example, a base station
- a predetermined beam to which a cell-specific physical channel or physical signal is transmitted is transmitted in one time instance (time resource).
- Different time instances can send different beams.
- the beam is switched at the time instance. Switching the beam at this time instance is called beam sweep. Even with a digital antenna configuration, a plurality of beams may be operated.
- the beam can be paraphrased into terms such as channel, path, antenna, antenna port, and so on. That is, transmissions using different beams can be rephrased as transmissions using different channels, paths, antennas, or antenna ports. Furthermore, the beam can also be envisioned as a virtual cell. The terminal device can recognize different beams transmitted from the same cell as different virtual cells or carriers.
- the system selects an appropriate beam for each of the downlink and the uplink. Specifically, it is preferable to select an appropriate beam for each of the downlink transmission beam of the base station and the downlink reception beam of the terminal device. Further, it is preferable that an appropriate beam is selected for each of the uplink transmission beam of the terminal device and the uplink reception beam of the base station.
- the appropriate downlink transmit beam for the base station can be obtained based on the report or feedback information from the receiving terminal device.
- the following is an example of the process of obtaining a suitable downlink transmit beam.
- the base station transmits a predetermined known signal multiple times using different downlink transmission beams.
- the terminal device determines an appropriate downlink transmission beam from the known signals transmitted multiple times based on the reception strength or reception quality, and reports the information corresponding to the appropriate downlink transmission beam to the base station. Or give feedback. This allows the base station to recognize the appropriate downlink transmit beam.
- the known signals are SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block (also referred to as SSB (Synchronization Signal Block)), CSI-RS (Channel State Information-Reference Signal), PDCCH (Physical).
- SS Synchronization Signal
- PBCH Physical Broadcast Channel
- CSI-RS Channel State Information-Reference Signal
- PDCCH Physical.
- DMRS Demodulation Reference Signal
- DMRS of PDSCH Physical Downlink Shared Channel
- PTRS Phase Tracking Reference Signal
- the appropriate downlink transmit beam of the base station can be obtained based on the appropriate uplink receive beam of the base station.
- the appropriate uplink transmission beam for the terminal device can be obtained based on the report or feedback information from the receiving base station.
- the following is an example of the process of obtaining a suitable uplink transmit beam.
- the terminal device transmits a predetermined known signal multiple times using different uplink transmission beams.
- the base station determines an appropriate uplink transmission beam from the known signals transmitted multiple times based on the reception strength or reception quality, and reports the information corresponding to the appropriate uplink transmission beam to the terminal device. Or give a notification. This allows the terminal device to recognize the appropriate uplink transmit beam.
- examples of the known signal include RACH (Random Access Channel) preamble, SRS (Sounding Reference Signal), PUCCH (Physical Uplink Control Channel) DMRS, and PUSCH (Physical Uplink Shared Channel) DMRS.
- RACH Random Access Channel
- SRS Sounding Reference Signal
- PUCCH Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- the appropriate uplink transmit beam of the terminal device can be obtained based on the appropriate downlink receive beam of the terminal device.
- QCL Quadrature-Co-Location
- channel characteristics include Doppler shift, Doppler spread, average delay, delay spread, spatial Rx parameter, and the like.
- the QCL between the antenna ports is specified in the TCI (Transmission Configuration Indicator) state.
- the TCI status is the QCL relationship between the downlink reference signal and the PDSCH DMRS port, the QCL relationship between the downlink reference signal and the PDCCH DMRS port, or the downlink reference signal and the NZP (Non-Zero-Power) CSI.
- NZP Non-Zero-Power
- - contains parameters to set the QCL relationship of the RS resource with the CSI-RS port.
- the TCI state is defined by the following types (1) to (4).
- QCL-TypeA ⁇ Doppler shift, Doppler spread, average delay, delay spread ⁇
- QCL-TypeB ⁇ Doppler shift, Doppler spread ⁇
- QCL-TypeC ⁇ Doppler spread, average delay ⁇
- QCL-TypeD ⁇ Spatial Rx (Receiver, Reception) parameter ⁇
- the terminal device specifies the TCI state by DCI (Downlink Control Information), MAC CE (Medium Access Control Element), or RRC (Radio Resource Control) signaling. Specifically, the terminal device receives information on activation / deactivation of the TCI state of the terminal device-specific PDSCH by MAC CE. The terminal device receives the TCI status instruction for the terminal device-specific PDCCH by MAC CE. The terminal device receives the TCI status instruction for the PDSCH by DCI.
- DCI Downlink Control Information
- MAC CE Medium Access Control Element
- RRC Radio Resource Control
- the downlink transmission beam is defined by a predetermined signal index and QCL (Quasi-Co-Location).
- the predetermined signal is, for example, an SS / PBCH block.
- a plurality of SS / PBCH blocks having the same information having different indexes can be transmitted.
- SS / PBCH blocks with different indexes may be transmitted by different transmit beams.
- the TCI state of the SS / PBCH block of a given index and the DMRS of the other reference signal or physical channel determines the relationship between the beam of the other reference signal and the physical channel.
- the predetermined signal is, for example, NZP CSI-RS.
- Multiple NZP CSI-RS resources are set.
- CSI-RS ports of different CSI-RS resources may be transmitted by different transmit beams.
- the TCI state of the CSI-RS port of the CSI-RS resource with the DMRS of the other reference signal or physical channel determines the relationship between the beam of the other reference signal and the physical channel.
- the layer 1 relay is a relay that amplifies the power of a downlink reception RF (Radio Frequency) signal from a base station without decoding it and transmits it to a terminal device.
- the layer 1 relay is also called AF (Amplifier and Forward).
- FIG. 3 is a diagram showing an outline of the layer 1 relay. Although the layer 1 relay of the downlink is shown in FIG. 3, the layer 1 relay can also be applied to the uplink. In the uplink layer 1 relay, the uplink received RF signal from the terminal device is power-amplified and transmitted to the base station in the same manner as the downlink layer 1 relay.
- Boosters and repeaters eg, RF Repeater
- FIG. 4 is a diagram showing an outline of the repeater system.
- the conventional layer 1 relay consists only of an ADC (Analog-to-Digital Converter) / DAC (Digital-to-Analog Converter) and a power amplifier circuit, so the device function is simple. Therefore, the layer 1 relay has a low cost and a small relay processing delay. On the other hand, the layer 1 relay has a drawback that fine resource control cannot be performed because the device function is the minimum. For example, the layer 1 relay amplifies the interference at the same time and transfers the relay, so that the effect of improving the system efficiency is limited.
- ADC Analog-to-Digital Converter
- DAC Digital-to-Analog Converter
- FIG. 5 is a diagram showing an outline of the layer 3 relay.
- IAB Integrated Access and Backhaul link
- FIG. 6 is a diagram showing an outline of IAB.
- FIG. 7 is a diagram showing a protocol stack of RRC and NAS connection of IAB-MT (Mobile Termination).
- the IAB operates as an IAB-MT (Mobile Termination) for an IAB donor node that provides a backhaul, and operates as an IAB-DU (Distributed Unit) for a terminal device 40 that provides access.
- IAB-MT Mobile Termination
- IAB-DU Distributed Unit
- the IAB donor node may be, for example, base station 20, and operates as an IAB-CU (Central Unit).
- the IAB is classified as a layer 3 relay because it decodes the relayed data up to layer 3.
- layer 3 relays can perform communication control such as resource management, they are expensive because they require the same function implementation as base stations.
- the conventional layer 1 relay has the minimum device function, so that fine resource control cannot be performed.
- a layer 3 relay can perform communication control such as resource management, it is expensive because it requires a function implementation equivalent to that of a base station. Therefore, in recent years, a layer 1 relay (repeater) that is inexpensive and has a beam control function has been studied.
- a layer 1 relay equipped with a beam control function is also called a smart repeater.
- the smart repeater is a layer 1 relay that enables control at the physical layer (PHY layer) level as opposed to the conventional layer 1 relay (eg, RF repeater).
- PHY layer physical layer
- RF repeater e.g., RF repeater
- Examples of physical layer level control include uplink / downlink resource allocation, beamforming control, and the like.
- Smart repeaters reduce interference by dynamically controlling the physical layer level. This further improves the system efficiency of the layer 1 relay.
- FIG. 8 is a diagram showing an outline of the smart repeater system. Since the smart repeater does not have a resource control unit, it needs to be controlled from the outside (for example, a base station). In the example of FIG. 8, the smart repeater operates under the control of a base station (gNB). In the following explanation, for ease of understanding, the link between the base station (for example, eNB, eNodeB, gNB, gNodeB) and the smart repeater is referred to as the front hole link (Fronthaul link), and the link between the smart repeater and the terminal device is used. Is distinguished from access links. The access link does not have to be a link between the smart repeater and the terminal device. For example, the link between the base station and the terminal device may be referred to as an access link. That is, from the viewpoint of the terminal device, the smart repeater may not be recognized, but may be configured to simply recognize that there is an access link with the base station.
- gNB base station
- FIG. 9 is a diagram showing an example of a protocol stack of a user plane (U-Plane) between a base station and a terminal device via a smart repeater.
- the smart repeater receives the downlink physical channel from the base station to the RF (Radio Frequency) layer, processes it, and transfers it to the terminal device.
- the smart repeater receives the uplink physical signal / physical channel from the terminal device up to the RF layer, processes it, and transfers it to the base station.
- RF Radio Frequency
- FIG. 10 is a diagram showing another example of the protocol stack of the user plane (C-Plane) between the base station and the terminal device via the smart repeater.
- the smart repeater receives the downlink physical channel from the base station to the physical layer and transfers it to the terminal device. Similarly, the smart repeater receives the uplink physical channel from the terminal device to the physical layer and transfers it to the base station.
- the smart repeater terminates up to the C-Plane information of the physical layer, but the information of the layers above the physical layer (upper layer) (e.g., MAC layer, RLC layer, PDCP layer, SDAP layer, RRC layer) Do not terminate.
- the layers above the physical layer e.g., MAC layer, RLC layer, PDCP layer, SDAP layer, RRC layer
- the smart repeater can also rewrite (re-generate) the control information of the physical layer (for example, information on beam control, information on TDD setting).
- the smart repeater receives physical layer control information (DCI, etc.) from a base station, rewrites it into appropriate information when transferring it to a terminal device (regeneration (re)). -generate) and transfer).
- DCI physical layer control information
- FIG. 11 is a diagram showing another example of the protocol stack of the control plane (C-Plane) of the base station and the smart repeater.
- the control plane of the smart repeater has a protocol stack equivalent to that of a terminal device.
- the terminal device distinguishes whether it is connected to the base station or the smart repeater.
- the SSB and CSI-RS of the smart repeater are assigned indexes different from those of the base station.
- the base station can also set the appropriate beam to the terminal device even if the terminal device connects to the smart repeater. Can be recognized.
- FIG. 12 is a diagram showing an example of the relationship between the beam of the smart repeater and the SSB.
- the base station provides the smart repeater from SSB # 0 to SSB # 6.
- the smart repeater transfers SSB # 0 to SSB # 6 transferred from the base station using different transmission beams.
- the base station can recognize that the terminal device connected to any of SSB # 0 to SSB # 6 is connected to the smart repeater.
- the transmission beam of the smart repeater and the SSB / CSI-RS are linked by RRC signaling. That is, the information (e.g., Information Element (IE)) indicating the association between one or more transmission beams of the smart repeater and the SSB / CSI-RS is an RRC message (e.g., RRC Reconfiguration message, RRC Setup message). Can be included in.
- the link between the transmission beam of the smart repeater and the SSB / CSI-RS may be set as a fixed pattern at the time of installation or maintenance of the smart repeater.
- FIG. 13 is a diagram showing an outline of a system of intelligent surfaces.
- An intelligent surface is a metamaterial composed of a plurality of reflecting elements whose reflection characteristics can be controlled. By changing the phase of each reflecting element when the radio wave is re-radiated, the reflection direction is controlled regardless of the incident angle.
- DAC Digital-to-Analog Converter
- ADC Analog-to-Digital Converter
- power amplification circuit Compared to repeaters, DAC (Digital-to-Analog Converter) / ADC (Analog-to-Digital Converter) and power amplification circuit are not required, or a simple circuit is sufficient, so there is no amplification noise and the price is low. Advantages include low cost, low power consumption, and short relay processing delay. Intelligent surfaces are also referred to as Large Intelligent Surfaces, Reflecting Surfaces, Reconfigurable Surfaces, and meta-material Surfaces.
- the intelligent surface does not have a wireless resource control unit, it is controlled from the outside like a smart repeater.
- the characteristics of the reflecting element are controlled from an external device (for example, a base station).
- the intelligent surface has a transmitter and a receiver.
- the intelligent surface includes an antenna 413 that is also used as a reflector, a transmission processing unit 411, and a reception processing unit 412.
- the intelligent surface can generate and transmit physical signals and / or physical channels.
- the intelligent surface of this configuration facilitates communication of the control plane (C-Plane) with other devices (base station 20, relay device 30, or terminal device 40).
- the intelligent surface has a receiving circuit and no transmitter.
- the intelligent surface includes an antenna 413 that is also used as a reflector and a reception processing unit 412, and does not include a transmission processing unit 411. Since this configuration does not include the transmission processing unit 411, only control information can be received, but the device configuration is simpler and the manufacturing cost can be easily suppressed.
- the intelligent surface will also be described as a kind of smart repeater. That is, the relay device 30 described later may be an intelligent surface.
- a layer 3 relay such as IAB will be introduced as a relay.
- IAB In a layer 3 relay, all packets at the relay node need to be decoded up to layer 3 and then all re-encoded for transmission to the forwarding destination. It is costly to implement such a complicated function (for example, a function equivalent to a base station). If IAB is introduced as a relay technology, the cost for operation may increase. If this happens, efficient operation of wireless communication may not be realized.
- a layer 1 relay for example, RF Repeater
- Layer 1 relays are low cost and have a small relay processing delay.
- the RF Repeater consists of only an ADC (Analog-to-Digital Converter) / DAC (Digital-to-Analog Converter) and a power amplifier circuit, so the device functions are simple, low cost, and relay processing delay. small.
- the conventional layer 1 relay transmits the received signal as it is to extend the coverage, precise resource control cannot be performed.
- the band in which the conventional layer 1 relay is used is the FDD band of FR1, the uplink and the downlink cannot be adjusted.
- a layer 1 relay is required as an inexpensive relay device. If a conventional layer 1 relay is installed, interference between the front hole and the access link and unnecessary cell-to-cell interference are amplified, and the system efficiency is lowered. It is expected that the Smart Repeater will be introduced, but the details of the control information and procedures in the front hall between the base station and the Smart Repeater are unknown for the Smart Repeater. There is a possibility that the performance will not be improved sufficiently just by introducing the Smart Repeater.
- the coverage (particularly the coverage of FR2) can be expanded inexpensively and easily by introducing a smart repeater.
- the smart repeater of the present embodiment receives a physical control signal including information about a beam between the smart repeater and the terminal device.
- the physical control signal is DCI (Downlink Control Information) for the smart repeater from the base station.
- the smart repeater controls the beam between the smart repeater and the terminal device based on the information about the beam.
- the beam of the IAB access link can be determined by the IAB node.
- the beam of the access link of the smart repeater is determined by the base station.
- the IAB node has a separate cell ID. Since the cell IDs are different, the terminal can recognize each SSB even if the SSB indexes are the same. On the other hand, smart repeaters may not have a separate cell ID. Therefore, it may be necessary to distinguish between the SSB of the base station and the SSB of the smart repeater in order to perform appropriate beam control.
- the IAB node supports the function of gNB-DU.
- smart repeaters do not have to support some of the features of gNB-DU.
- the smart repeater hosts only a part (for example, PHY) of a plurality of lower layers supported by gNB-DU in the access layer (Access Stratum) for communication with the UE.
- a plurality of other higher layers eg, RRC, SDAP, PDCP, RLC, MAC
- the IAB node supports some of the functions of the UE.
- the smart repeater may not support some of the UE features supported by the IAB node.
- FIG. 14 is a diagram showing a configuration example of the communication system 1 according to the embodiment of the present disclosure.
- the communication system 1 includes a management device 10, a base station 20, a relay device 30, and a terminal device 40.
- the communication system 1 provides a user with a wireless network capable of mobile communication by operating the wireless communication devices constituting the communication system 1 in cooperation with each other.
- the wireless network of this embodiment is composed of, for example, a wireless access network and a core network.
- the wireless communication device is a device having a wireless communication function, and in the example of FIG. 14, the base station 20, the relay device 30, and the terminal device 40 are applicable.
- the communication system 1 may include a plurality of management devices 10, a base station 20, a relay device 30, and a terminal device 40, respectively.
- the communication system 1 includes management devices 10 1 , 102 and the like as the management device 10, and base stations 201, 202 and the like as the base station 20 , and communication system 1 Is equipped with relay devices 30 1 , 302 and the like as the relay device 30 , and is provided with terminal devices 40 1 , 402 , 403 and the like as the terminal device 40.
- the device in the figure may be considered as a device in a logical sense. That is, a part of the device in the figure may be realized by a virtual machine (VM: Virtual Machine), a container (Container), a docker (Docker), etc., and they may be mounted on physically the same hardware.
- VM Virtual Machine
- Container Container
- Docker docker
- the communication system 1 may be compatible with wireless access technology (RAT: Radio Access Technology) such as LTE (Long Term Evolution) and NR (New Radio).
- RAT Radio Access Technology
- LTE and NR are a kind of cellular communication technology, and enable mobile communication of a terminal device by arranging a plurality of areas covered by a base station in a cell shape.
- the wireless access method used by the communication system 1 is not limited to LTE and NR, and is another wireless access method such as W-CDMA (Wideband Code Division Multiple Access) and cdma2000 (Code Division Multiple Access 2000). May be good.
- W-CDMA Wideband Code Division Multiple Access
- cdma2000 Code Division Multiple Access 2000
- the base station or relay station constituting the communication system 1 may be a ground station or a non-ground station.
- the non-ground station may be a satellite station or an aircraft station. If the non-ground station is a satellite station, the communication system 1 may be a Bent-pipe (Transparent) type mobile satellite communication system.
- the ground station (also referred to as a ground base station) means a base station (including a relay station) installed on the ground.
- ground is a broadly defined ground that includes not only land but also underground, water, and water. In the following description, the description of "ground station” may be replaced with “gateway”.
- the LTE base station may be referred to as eNodeB (Evolved Node B) or eNB.
- the base station of NR may be referred to as gNodeB or gNB.
- a terminal device also referred to as a mobile station or a terminal
- UE User Equipment
- the terminal device is a kind of communication device, and is also referred to as a mobile station or a terminal.
- the concept of a communication device includes not only a portable mobile device (terminal device) such as a mobile terminal, but also a device installed in a structure or a mobile body.
- the structure or the moving body itself may be regarded as a communication device.
- the concept of a communication device includes not only a terminal device but also a base station and a relay station.
- a communication device is a kind of processing device and information processing device. Further, the communication device can be paraphrased as a transmission device or a reception device.
- each device constituting the communication system 1 will be specifically described.
- the configuration of each device shown below is just an example.
- the configuration of each device may be different from the configuration shown below.
- the management device 10 is a device that manages a wireless network.
- the management device 10 is a device that manages the communication of the base station 20.
- the core network is an EPC (Evolved Packet Core)
- the management device 10 is, for example, a device having a function as an MME (Mobility Management Entity).
- the core network is a 5GC (5G Core network)
- the management device 10 is, for example, a device having a function as an AMF (Access and Mobility Management Function) and / or an SMF (Session Management Function).
- the functions of the management device 10 are not limited to MME, AMF, and SMF.
- the management device 10 may be a device having functions as NSSF (Network Slice Selection Function), AUSF (Authentication Server Function), and UDM (Unified Data Management). Further, the management device 10 may be a device having a function as an HSS (Home Subscriber Server).
- NSSF Network Slice Selection Function
- AUSF Authentication Server Function
- UDM Unified Data Management
- HSS Home Subscriber Server
- the management device 10 may have a gateway function.
- the management device 10 may have a function as an S-GW (Serving Gateway) or a P-GW (Packet Data Network Gateway).
- the management device 10 may have a function as an UPF (User Plane Function).
- the management device 10 does not necessarily have to be a device constituting the core network.
- the core network is a core network of W-CDMA (Wideband Code Division Multiple Access) or cdma2000 (Code Division Multiple Access 2000).
- the management device 10 may be a device that functions as an RNC (Radio Network Controller).
- RNC Radio Network Controller
- FIG. 15 is a diagram showing a configuration example of the management device 10 according to the embodiment of the present disclosure.
- the management device 10 includes a communication unit 11, a storage unit 12, and a control unit 13.
- the configuration shown in FIG. 15 is a functional configuration, and the hardware configuration may be different from this. Further, the functions of the management device 10 may be implemented statically or dynamically distributed in a plurality of physically separated configurations.
- the management device 10 may be composed of a plurality of server devices.
- the communication unit 11 is a communication interface for communicating with other devices.
- the communication unit 11 may be a network interface or a device connection interface.
- the communication unit 11 may be a LAN (Local Area Network) interface such as a NIC (Network Interface Card), or a USB interface composed of a USB (Universal Serial Bus) host controller, a USB port, or the like. It is also good.
- the communication unit 11 may be a wired interface or a wireless interface.
- the communication unit 11 functions as a communication means of the management device 10.
- the communication unit 11 communicates with the base station 20 and the like according to the control of the control unit 13.
- the storage unit 12 is a storage device capable of reading and writing data such as a DRAM (Dynamic Random Access Memory), a SRAM (Static Random Access Memory), a flash memory, and a hard disk.
- the storage unit 12 functions as a storage means for the management device 10.
- the storage unit 12 stores, for example, the connection state of the terminal device 40.
- the storage unit 12 stores the state of the RRC (Radio Resource Control) of the terminal device 40, the state of the ECM (EPS Connection Management), or the state of the 5G System CM (Connection Management).
- the storage unit 12 may function as a home memory for storing the position information of the terminal device 40.
- the control unit 13 is a controller that controls each unit of the management device 10.
- the control unit 13 is realized by, for example, a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).
- the control unit 13 is realized by the processor executing various programs stored in the storage device inside the management device 10 using a RAM (Random Access Memory) or the like as a work area.
- the control unit 13 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).
- the CPU, MPU, ASIC, and FPGA can all be regarded as controllers.
- the base station 20 is a wireless communication device that wirelessly communicates with the terminal device 40.
- the base station 20 may be configured to wirelessly communicate with the terminal device 40 via the relay device 30, or may be configured to directly communicate wirelessly with the terminal device 40.
- Base station 20 is a kind of communication device. More specifically, the base station 20 is a device corresponding to a wireless base station (Base Station, Node B, eNB, gNB, etc.) or a wireless access point (Access Point).
- the base station 20 may be a wireless relay station. Further, the base station 20 may be an optical overhanging device called RRH (Remote Radio Head). Further, the base station 20 may be a receiving station such as an FPU (Field Pickup Unit). Further, the base station 20 is an IAB (Integrated Access and Backhaul) donor node or an IAB relay node that provides a wireless access line and a wireless backhaul line by time division multiplexing, frequency division multiplexing, or spatial division multiplexing. May be good.
- IAB Integrated Access and Backhaul
- the wireless access technique used by the base station 20 may be a cellular communication technique or a wireless LAN technique.
- the wireless access technique used by the base station 20 is not limited to these, and may be another wireless access technique.
- the wireless access technique used by the base station 20 may be an LPWA (Low Power Wide Area) communication technique.
- the wireless communication used by the base station 20 may be wireless communication using millimeter waves.
- the wireless communication used by the base station 20 may be wireless communication using radio waves, or wireless communication using infrared rays or visible light (optical radio).
- the base station 20 may be capable of NOMA (Non-Orthogonal Multiple Access) communication with the terminal device 40.
- NOMA communication is communication using non-orthogonal resources (transmission, reception, or both).
- the base station 20 may be capable of NOMA communication with another base station 20.
- a non-orthogonal resource is a resource whose axis is different from that of an orthogonal resource (time, frequency, and space), and uses, for example, scramble, interleave, code (eg, diffusion code, sparse code, etc.), power difference, and the like. It is a radio resource that can separate different signals.
- the base station 20 may be able to communicate with each other via an interface between the base station and the core network (for example, S1 Interface, etc.). This interface may be wired or wireless. Further, the base stations may be able to communicate with each other via an interface between base stations (for example, X2 Interface, S1 Interface, etc.). This interface may be wired or wireless.
- the base station 20 may be able to communicate with each other via an interface between the base station and the core network (for example, NG Interface, S1 Interface, etc.). This interface may be wired or wireless. Further, the base stations may be able to communicate with each other via an interface between base stations (for example, Xn Interface, X2 Interface, etc.). This interface may be wired or wireless.
- the concept of a base station includes not only a donor base station but also a relay base station (also referred to as a relay station). Further, the concept of a base station includes not only a structure having a function of a base station but also a device installed in the structure.
- Structures are, for example, high-rise buildings, houses, steel towers, station facilities, airport facilities, port facilities, office buildings, school buildings, hospitals, factories, commercial facilities, stadiums, and other buildings.
- the concept of structure includes not only buildings but also structures such as tunnels, bridges, dams, walls, and iron pillars, and equipment such as cranes, gates, and windmills.
- the concept of a structure includes not only a structure on land (above ground in a narrow sense) or in the ground, but also a structure on water such as a pier and a mega float, and an underwater structure such as an ocean observation facility.
- a base station can be rephrased as an information processing device.
- the base station 20 may be a donor station or a relay station. Further, the base station 20 may be a fixed station or a mobile station.
- a mobile station is a wireless communication device (for example, a base station) configured to be mobile.
- the base station 20 may be a device installed on the mobile body or may be the mobile body itself.
- a relay station having mobility can be regarded as a base station 20 as a mobile station.
- devices that are originally mobile capable such as vehicles, UAVs (Unmanned Aerial Vehicles) represented by drones, and smartphones, and that are equipped with base station functions (at least part of the base station functions) are also mobile. It corresponds to the base station 20 as a station.
- the mobile body may be a mobile terminal such as a smartphone or a mobile phone.
- the moving body may be a moving body (for example, a vehicle such as a car, a bicycle, a bus, a truck, a motorcycle, a train, a linear motor car, etc.) that moves on land (ground in a narrow sense), or in the ground (for example, a vehicle).
- a moving body for example, a subway
- a tunnel for example, a subway
- the moving body may be a moving body moving on the water (for example, a ship such as a passenger ship, a cargo ship, a hovercraft, etc.), or a moving body moving underwater (for example, a submersible, a submarine, an unmanned submarine, etc.). It may be a submarine).
- the moving body may be a moving body (for example, an aircraft such as an airplane, an airship, or a drone) that moves in the atmosphere.
- a moving body for example, an aircraft such as an airplane, an airship, or a drone
- the base station 20 may be a ground base station (ground station) installed on the ground.
- the base station 20 may be a base station arranged in a structure on the ground, or may be a base station installed in a moving body moving on the ground.
- the base station 20 may be an antenna installed in a structure such as a building and a signal processing device connected to the antenna.
- the base station 20 may be a structure or a mobile body itself. "Ground" is not only on land (ground in a narrow sense) but also on the ground in a broad sense including underground, water, and water.
- the base station 20 is not limited to the ground base station.
- the base station 20 may be an aircraft station. From the perspective of satellite stations, aircraft stations located on Earth are ground stations.
- the base station 20 is not limited to the ground station.
- the base station 20 may be a non-ground base station (non-ground station) capable of floating in the air or in space.
- the base station 20 may be an aircraft station or a satellite station.
- a satellite station is a satellite station that can float outside the atmosphere.
- the satellite station may be a device mounted on a space moving body such as an artificial satellite, or may be a space moving body itself.
- Space moving objects are moving objects that move outside the atmosphere. Examples of space moving objects include artificial celestial bodies such as artificial satellites, spacecraft, space stations, and spacecraft.
- the satellites that serve as satellite stations are low orbit (LEO: Low Earth Orbiting) satellites, medium orbit (MEO: Medium Earth Orbiting) satellites, stationary (GEO: Geostationary Earth Orbiting) satellites, and high elliptical orbit (HEO: Highly Elliptical Orbiting) satellites. ) It may be any of the satellites.
- the satellite station may be a device mounted on a low earth orbit satellite, a medium earth orbit satellite, a geostationary satellite, or a high elliptical orbit satellite.
- the Aircraft Bureau is a wireless communication device that can float in the atmosphere, such as aircraft.
- the aircraft station may be a device mounted on an aircraft or the like, or may be an aircraft itself.
- the concept of an aircraft includes not only heavy aircraft such as airplanes and gliders, but also light aircraft such as balloons and airships.
- the concept of an aircraft includes not only heavy aircraft and light aircraft, but also rotary-wing aircraft such as helicopters and autogyros.
- the aircraft station (or the aircraft on which the aircraft station is mounted) may be an unmanned aerial vehicle such as a drone.
- unmanned aerial vehicle also includes unmanned aerial vehicles (UAS: Unmanned Aircraft Systems) and tethered unmanned aerial vehicles (tethered UAS).
- UAS Unmanned Aircraft Systems
- tethered UAS tethered unmanned aerial vehicles
- unmanned aerial vehicle includes a light unmanned aerial vehicle system (LTA: Lighter than Air UAS) and a heavy unmanned aerial vehicle system (HTA: Heavier than Air UAS).
- HAPs High Altitude UAS Platforms.
- the size of the coverage of the base station 20 may be as large as that of a macro cell or as small as that of a pico cell. Of course, the size of the coverage of the base station 20 may be extremely small, such as a femtocell. Further, the base station 20 may have a beamforming capability. In this case, the base station 20 may form a cell or a service area for each beam. Therefore, the base station 20 may be equipped with an antenna array composed of a plurality of antenna elements to provide Advanced Antenna Technology represented by MIMO (Multiple Input Multiple Output) and beamforming. ..
- MIMO Multiple Input Multiple Output
- FIG. 16 is a diagram showing a configuration example of the base station 20 according to the embodiment of the present disclosure.
- the base station 20 includes a wireless communication unit 21, a storage unit 22, and a control unit 23.
- the configuration shown in FIG. 16 is a functional configuration, and the hardware configuration may be different from this. Further, the functions of the base station 20 may be distributed and implemented in a plurality of physically separated configurations.
- the wireless communication unit 21 is a signal processing unit for wireless communication with another wireless communication device (for example, a terminal device 40).
- the wireless communication unit 21 operates according to the control of the control unit 23.
- the wireless communication unit 21 corresponds to one or a plurality of wireless access methods.
- the wireless communication unit 21 corresponds to both NR and LTE.
- the wireless communication unit 21 may support W-CDMA and cdma2000 in addition to NR and LTE. Further, the wireless communication unit 21 may support an automatic retransmission technique such as HARQ (Hybrid Automatic Repeat reQuest).
- HARQ Hybrid Automatic Repeat reQuest
- the wireless communication unit 21 includes a transmission processing unit 211, a reception processing unit 212, and an antenna 213.
- the wireless communication unit 21 may include a plurality of transmission processing units 211, reception processing units 212, and antennas 213, respectively.
- each unit of the wireless communication unit 21 may be individually configured for each wireless access method.
- the transmission processing unit 211 and the reception processing unit 212 may be individually configured by LTE and NR.
- the antenna 213 may be composed of a plurality of antenna elements (for example, a plurality of patch antennas).
- the wireless communication unit 21 may be configured to be beamforming.
- the wireless communication unit 21 may be configured to be capable of polarization beamforming using vertically polarized waves (V polarization) and horizontally polarized waves (H polarization).
- the transmission processing unit 211 performs downlink control information and downlink data transmission processing.
- the transmission processing unit 211 encodes the downlink control information and the downlink data input from the control unit 23 by using a coding method such as block coding, convolutional coding, or turbo coding.
- the coding may be performed by a polar code (Polar Code) or an LDPC code (Low Density Parity Check Code).
- the transmission processing unit 211 modulates the coding bit by a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM. In this case, the signal points on the constellation do not necessarily have to be equidistant.
- the constellation may be a non-uniform constellation (NUC: Non Uniform Constellation).
- NUC Non Uniform Constellation
- the transmission processing unit 211 multiplexes the modulation symbol of each channel and the downlink reference signal, and arranges them in a predetermined resource element. Then, the transmission processing unit 211 performs various signal processing on the multiplexed signal. For example, the transmission processing unit 211 converts to the frequency domain by fast Fourier transform, adds a guard interval (cyclic prefix), generates a baseband digital signal, converts to an analog signal, orthogonal modulation, up-conversion, and extra. Performs processing such as removing frequency components and amplifying power.
- the signal generated by the transmission processing unit 211 is transmitted from the antenna 213.
- the reception processing unit 212 processes the uplink signal received via the antenna 213. For example, the reception processing unit 212 may down-convert the uplink signal, remove unnecessary frequency components, control the amplification level, orthogonal demodulate, convert to a digital signal, remove the guard interval (cyclic prefix), and perform high speed. The frequency domain signal is extracted by Fourier transform. Then, the reception processing unit 212 separates uplink channels such as PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) and uplink reference signals from the signals subjected to these processes.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- the reception processing unit 212 demodulates the received signal with respect to the modulation symbol of the uplink channel by using a modulation method such as BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying).
- the modulation method used for demodulation may be 16QAM (Quadrature Amplitude Modulation), 64QAM, 256QAM, or 1024QAM.
- the signal points on the constellation do not necessarily have to be equidistant.
- the constellation may be a non-uniform constellation (NUC).
- the reception processing unit 212 performs decoding processing on the coded bits of the demodulated uplink channel.
- the decoded uplink data and uplink control information are output to the control unit 23.
- Antenna 213 is an antenna device (antenna unit) that mutually converts current and radio waves.
- the antenna 213 may be composed of one antenna element (for example, one patch antenna) or may be composed of a plurality of antenna elements (for example, a plurality of patch antennas).
- the wireless communication unit 21 may be configured to be beamforming.
- the wireless communication unit 21 may be configured to generate a directivity beam by controlling the directivity of a radio signal using a plurality of antenna elements.
- the antenna 213 may be a dual polarization antenna.
- the wireless communication unit 21 may use vertical polarization (V polarization) and horizontal polarization (H polarization) in transmitting the radio signal. Then, the radio communication unit 21 may control the directivity of the radio signal transmitted by using the vertically polarized wave and the horizontally polarized wave.
- V polarization vertical polarization
- H polarization horizontal polarization
- the storage unit 22 is a storage device that can read and write data such as DRAM, SRAM, flash memory, and a hard disk.
- the storage unit 22 functions as a storage means for the base station 20.
- the control unit 23 is a controller that controls each unit of the base station 20.
- the control unit 23 is realized by, for example, a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit).
- the control unit 23 is realized by the processor executing various programs stored in the storage device inside the base station 20 using a RAM (Random Access Memory) or the like as a work area.
- the control unit 23 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).
- the CPU, MPU, ASIC, and FPGA can all be regarded as controllers.
- the control unit 23 may be realized by a GPU (Graphics Processing Unit) in addition to or instead of the CPU.
- the concept of a base station may consist of a set of multiple physical or logical devices.
- the base station may be classified into a plurality of devices such as BBU (Baseband Unit) and RU (Radio Unit).
- the base station may be interpreted as an aggregate of these plurality of devices.
- the base station may be either BBU or RU, or both.
- the BBU and RU may be connected by a predetermined interface (for example, eCPRI (enhanced Common Public Radio Interface)).
- RU may be paraphrased as RRU (Remote Radio Unit) or RD (Radio DoT).
- the RU may correspond to gNB-DU (gNB Distributed Unit) described later.
- the BBU may be compatible with gNB-CU (gNB Central Unit), which will be described later.
- the RU may be a device integrally formed with the antenna.
- the antenna of the base station (for example, the antenna integrally formed with the RU) may adopt the Advanced Antenna System and support MIMO (for example, FD-MIMO) or beamforming.
- the antenna included in the base station may include, for example, 64 transmitting antenna ports and 64 receiving antenna ports.
- the antenna mounted on the RU may be an antenna panel composed of one or more antenna elements, and the RU may mount one or more antenna panels.
- the RU has two types of antenna panels, a horizontally polarized antenna panel and a vertically polarized antenna panel, or two types of antenna panels, a right-handed circularly polarized antenna panel and a left-handed circularly polarized antenna panel. It may be installed. Further, the RU may form and control an independent beam for each antenna panel.
- a plurality of base stations may be connected to each other.
- One or more base stations may be included in a radio access network (RAN: Radio Access Network).
- the base station may be simply referred to as a RAN, a RAN node, an AN (Access Network), or an AN node.
- RAN in LTE may be called EUTRAN (Enhanced Universal Terrestrial RAN).
- EUTRAN Enhanced Universal Terrestrial RAN
- RAN in NR is sometimes called NGRAN.
- RAN in W-CDMA (UMTS) may be referred to as UTRAN.
- the LTE base station may be referred to as eNodeB (Evolved Node B) or eNB.
- EUTRAN includes one or more eNodeBs (eNBs).
- the base station of NR may be referred to as gNodeB or gNB.
- NGRAN contains one or more gNBs.
- the EUTRAN may include a gNB (en-gNB) connected to a core network (EPC) in an LTE communication system (EPS).
- NGRAN may include an ng-eNB connected to the core network 5GC in a 5G communication system (5GS).
- the base station When the base station is eNB, gNB, etc., the base station may be referred to as 3GPP access (3GPP Access). Further, when the base station is a wireless access point (Access Point), the base station may be referred to as non-3GPP access (Non-3GPP Access). Further, the base station may be an optical overhanging device called RRH (Remote Radio Head).
- the base station When the base station is gNB, the base station may be a combination of the above-mentioned gNB-CU and gNB-DU, or may be one of gNB-CU and gNB-DU. You may.
- the gNB-CU hosts a plurality of higher layers (for example, RRC, SDAP, PDCP) among the access layers (Access Stratum) for communication with the UE.
- the gNB-DU hosts a plurality of lower layers (for example, RLC, MAC, PHY) in the access layer (Access Stratum). That is, some of the above-mentioned or later-described messages / information are generated by gNB-CU as RRC signaling (quasi-static notification), and the rest are gNB- as MAC CE or DCI (dynamic notification). It may be generated by DU.
- some configurations such as IE: cellGroupConfig are generated by gNB-DU, and the rest of the configurations are generated. It may be generated by gNB-CU. These configurations may be transmitted and received by the F1 interface described later.
- the base station may be configured to be able to communicate with other base stations.
- the base stations may be connected by an X2 interface.
- the devices may be connected by an Xn interface.
- the devices may be connected by the F1 interface described above.
- the message / information described later may be transmitted between a plurality of base stations via, for example, an X2 interface, an Xn interface, or an F1 interface. ..
- the cell provided by the base station may be called a serving cell.
- the concept of serving cell includes PCell (Primary Cell) and SCell (Secondary Cell).
- PCell Primary Cell
- SCell Secondary Cell
- dual connectivity includes EUTRA-EUTRA Dual Connectivity, EUTRA-NR Dual Connectivity (ENDC), EUTRA-NR Dual Connectivity with 5GC, NR-EUTRA Dual Connectivity (NEDC), and NR-NR Dual Connectivity (NRDC).
- the serving cell may include a PSCell (Primary Secondary Cell or Primary SCG Cell).
- PSCell Primary Secondary Cell or Primary SCG Cell
- the PSCell provided by the SN (Secondary Node) and zero or more SCells may be referred to as SCG (Secondary Cell Group).
- SCG Secondary Cell Group
- PUCCH physical uplink control channel
- the physical uplink control channel (PUCCH) is transmitted by PCell and PSCell, but not by SCell.
- radio link failure is also detected in PCell and PSCell, but not in SCell (it does not have to be detected).
- PCell and PSCell have a special role in the serving cell, and therefore are also called SpCell (Special Cell).
- the smart repeater manages a cell different from the cell managed by the base station 20 (i.e., cell of the cell managed by the smart repeater (relay device 30 described later). If the ID is different from the cell ID of the cell managed by the base station 20), the cell managed by the smart repeater (relay device 30 described later) is a Serving cell in the PCell or SCell of Carrier Aggregation or the MCG or SCG of Dual Connectivity. May be. In this case, the other Serving cell may be a cell managed by the base station 20.
- the cell managed by the smart repeater has the same cell ID as the cell managed by the base station 20 (i.e., smart repeater (described later).
- the standard stipulates that the relay device 30) functions as a part of the cell managed by the base station 20), and the smart repeater (relay device 30 described later) cannot be connected to the base station as a part of the SpCell. May be. That is, the standard may specify that the smart repeater (relay device 30 described later) is used only in the case of a secondary cell (or a PS Cell for PCell).
- One downlink component carrier and one uplink component carrier may be associated with each cell.
- the system bandwidth corresponding to one cell may be divided into a plurality of BWPs (Bandwidth Part).
- one or a plurality of BWPs may be set in the UE, and one BWP portion may be used in the UE as an active BWP (Active BWP).
- the radio resources for example, frequency band, numerology (subcarrier spacing), and slot configuration
- the BWP in which the smart repeater is used may be restricted.
- the smart repeater may be a default BWP, an Initial BWP, or an RRC message. It may be used only at the specified predetermined BWP (Active BWP).
- the relay device 30 is a device that serves as a relay station for the base station.
- the relay device 30 is, for example, a smart repeater.
- the relay device 30 is a layer 1 relay that enables further control at the physical layer (PHY) level as compared with the conventional layer 1 relay. More specifically, the relay device 30 terminates only the processing of the C-Plane of the physical layer. In other words, the information of the layer above the physical layer (upper layer) (e.g., MAC layer, RLC layer, PDCP layer, SDAP layer, RRC layer) is not terminated. Examples of physical layer level control include uplink / downlink resource allocation, beamforming control, and the like. As mentioned above, intelligent surfaces can be considered a type of smart repeater.
- the relay device 30 is not limited to the smart repeater as long as it performs the following operations.
- the relay station of the present embodiment may be a fixed device, a movable device, or a floating device. Further, the size of the coverage of the relay station of the present embodiment is not limited to a specific size. For example, the cell covered by the relay station may be a macro cell, a micro cell, or a small cell. Of course, the size of the coverage of the relay device 30 may be extremely small, such as a femtocell. Further, the relay device 30 may have a beamforming capability. In this case, the relay device 30 may form a cell or a service area for each beam.
- the relay station of the present embodiment is not limited to the device to be mounted as long as the relay function is satisfied.
- the relay station may be mounted on a terminal device such as a smartphone, mounted on a car, a train, a rickshaw, a balloon, an airplane, a drone, a television or a game machine. , May be mounted on home appliances such as air conditioners, refrigerators and lighting fixtures.
- the relay station may be provided on the outer wall of the building (e.g., building). By providing the outer wall of the building, even if there is a shield between the base station and the terminal device, the signal from the base station can be transferred by the relay station provided on the outer wall of the building and reach the terminal device.
- the relay device 30 may be a device installed on the mobile body or may be the mobile body itself, like the base station 20 described above.
- the mobile body may be a mobile terminal such as a smartphone or a mobile phone.
- the moving body may be a moving body that moves on land (ground in a narrow sense) or may be a moving body that moves in the ground.
- the moving body may be a moving body that moves on the water or may be a moving body that moves in the water.
- the moving body may be a moving body moving in the atmosphere or a moving body moving out of the atmosphere.
- the base station 20 may be a ground station device or a non-ground station device.
- the relay device 30 may be an aircraft station or a satellite station.
- FIG. 17 is a diagram showing a configuration example of the relay device 30 according to the embodiment of the present disclosure.
- the relay device 30 includes a wireless communication unit 31, a storage unit 32, and a control unit 33.
- the configuration shown in FIG. 17 is a functional configuration, and the hardware configuration may be different from this. Further, the functions of the relay device 30 may be distributed and implemented in a plurality of physically separated configurations.
- the wireless communication unit 31 is a wireless communication interface that wirelessly communicates with another wireless communication device (for example, a base station 20, a terminal device 40, and another relay device 30).
- the wireless communication unit 31 corresponds to one or a plurality of wireless access methods.
- the wireless communication unit 31 corresponds to both NR and LTE.
- the wireless communication unit 31 may support W-CDMA or cdma3000 in addition to NR and LTE.
- the wireless communication unit 31 includes a transmission processing unit 311, a reception processing unit 312, and an antenna 313.
- the wireless communication unit 31 may include a plurality of transmission processing units 311, reception processing units 312, and antennas 313, respectively.
- each unit of the wireless communication unit 31 may be individually configured for each wireless access method.
- the transmission processing unit 311 and the reception processing unit 312 may be individually configured by LTE and NR.
- the configuration of the transmission processing unit 311, the reception processing unit 312, and the antenna 313 is the same as the configuration of the transmission processing unit 211, the reception processing unit 212, and the antenna 213 described above.
- the wireless communication unit 31 may be configured to be beamforming, similarly to the wireless communication unit 21.
- the storage unit 32 is a storage device that can read and write data such as DRAM, SRAM, flash memory, and a hard disk.
- the storage unit 32 functions as a storage means for the relay device 30.
- the control unit 33 is a controller that controls each unit of the relay device 30.
- the control unit 33 is realized by, for example, a processor such as a CPU or MPU.
- the control unit 33 is realized by the processor executing various programs stored in the storage device inside the relay device 30 with the RAM or the like as a work area.
- the control unit 33 may be realized by an integrated circuit such as an ASIC or FPGA.
- the CPU, MPU, ASIC, and FPGA can all be regarded as controllers.
- the control unit 33 includes a reception unit 331, a specific unit 332, and a communication control unit 333.
- Each block (reception unit 331 to communication control unit 333) constituting the control unit 33 is a functional block indicating the function of the control unit 33, respectively.
- These functional blocks may be software blocks or hardware blocks.
- each of the above-mentioned functional blocks may be one software module realized by software (including a microprogram), or may be one circuit block on a semiconductor chip (die).
- each functional block may be one processor or one integrated circuit.
- the control unit 33 may be configured in a functional unit different from the above-mentioned functional block. The method of configuring the functional block is arbitrary.
- Terminal device configuration Next, the configuration of the terminal device 40 will be described.
- the terminal device 40 is a wireless communication device that wirelessly communicates with other communication devices such as the base station 20 and the relay device 30.
- the terminal device 40 is, for example, a mobile phone, a smart device (smartphone or tablet), a PDA (Personal Digital Assistant), or a personal computer.
- the terminal device 40 may be a device such as a commercial camera equipped with a communication function, or may be a motorcycle, a mobile relay vehicle, or the like equipped with a communication device such as an FPU (Field Pickup Unit). ..
- the terminal device 40 may be an M2M (Machine to Machine) device or an IoT (Internet of Things) device.
- the terminal device 40 may be capable of NOMA communication with the base station 20. Further, the terminal device 40 may be able to use an automatic retransmission technique such as HARQ when communicating with the base station 20. The terminal device 40 may be capable of side-link communication with another terminal device 40. The terminal device 40 may be able to use an automatic retransmission technique such as HARQ even when performing side link communication. The terminal device 40 may also be capable of NOMA communication in communication (side link) with another terminal device 40. Further, the terminal device 40 may be capable of LPWA communication with another communication device (for example, the base station 20 and the other terminal device 40). Further, the wireless communication used by the terminal device 40 may be wireless communication using millimeter waves. The wireless communication (including side link communication) used by the terminal device 40 may be wireless communication using radio waves or wireless communication using infrared rays or visible light (optical radio). good.
- the terminal device 40 may be a mobile device.
- the mobile device is a mobile wireless communication device.
- the terminal device 40 may be a wireless communication device installed on the mobile body or may be the mobile body itself.
- the terminal device 40 is mounted on a vehicle (Vehicle) such as an automobile, a bus, a truck, or a motorcycle, a vehicle moving on a rail installed on a track of a train, or the vehicle. It may be a wireless communication device.
- the moving body may be a mobile terminal, or may be a moving body that moves on land (ground in a narrow sense), in the ground, on the water, or in the water. Further, the moving body may be a moving body that moves in the atmosphere such as a drone or a helicopter, or may be a moving body that moves outside the atmosphere such as an artificial satellite.
- the terminal device 40 may be connected to a plurality of base stations or a plurality of cells at the same time to perform communication. For example, when one base station supports a communication area via a plurality of cells (for example, pCell, sCell), carrier aggregation (CA: Carrier Aggregation) technology or dual connectivity (DC: Dual Connectivity) technology, By the multi-connectivity (MC) technology, it is possible to bundle the plurality of cells and communicate with the base station 20 and the terminal device 40. Alternatively, the terminal device 40 and the plurality of base stations 20 can communicate with each other via the cells of different base stations 20 by the coordinated transmission / reception (CoMP: Coordinated Multi-Point Transmission and Reception) technique.
- CoMP Coordinated Multi-Point Transmission and Reception
- FIG. 18 is a diagram showing a configuration example of the terminal device 40 according to the embodiment of the present disclosure.
- the terminal device 40 includes a wireless communication unit 41, a storage unit 42, and a control unit 43.
- the configuration shown in FIG. 18 is a functional configuration, and the hardware configuration may be different from this. Further, the functions of the terminal device 40 may be distributed and implemented in a plurality of physically separated configurations.
- the wireless communication unit 41 is a signal processing unit for wireless communication with other wireless communication devices (for example, a base station 20, a relay device 30, and another terminal device 40).
- the wireless communication unit 41 operates according to the control of the control unit 43.
- the wireless communication unit 41 includes a transmission processing unit 411, a reception processing unit 412, and an antenna 413.
- the configuration of the wireless communication unit 41, the transmission processing unit 411, the reception processing unit 412, and the antenna 413 may be the same as the wireless communication unit 21, the transmission processing unit 211, the reception processing unit 212, and the antenna 213 of the base station 20. .. Further, the wireless communication unit 41 may be configured to be beamforming like the wireless communication unit 21.
- the storage unit 42 is a storage device that can read and write data such as DRAM, SRAM, flash memory, and a hard disk.
- the storage unit 42 functions as a storage means for the terminal device 40.
- the control unit 43 is a controller that controls each unit of the terminal device 40.
- the control unit 43 is realized by, for example, a processor such as a CPU or MPU.
- the control unit 43 is realized by the processor executing various programs stored in the storage device inside the terminal device 40 with the RAM or the like as a work area.
- the control unit 43 may be realized by an integrated circuit such as an ASIC or FPGA.
- the CPU, MPU, ASIC, and FPGA can all be regarded as controllers. Further, the control unit 43 may be realized by the GPU in addition to or instead of the CPU.
- NR antenna configuration Next, the antenna configuration of NR will be described. In the following description, the antenna configuration of NR will be described using the base station 20 as an example. The NR antenna configuration described below can be applied not only to the base station 20 but also to the terminal device 40.
- the NR antenna configuration As the NR antenna configuration, a digital antenna configuration, an analog antenna configuration, and a hybrid antenna configuration are assumed.
- the hybrid antenna configuration is an antenna configuration in which a digital antenna configuration and an analog antenna configuration are combined.
- these three antenna configurations will be briefly described.
- the digital antenna configuration is a configuration in which the antenna weight is controlled by a digital circuit (baseband region) for each antenna element.
- FIG. 19 is a block diagram showing a digital antenna configuration.
- FIG. 19 shows the multiplexing unit 211c, the radio transmission unit 211d, and the antenna 213 in the configuration of the base station 20 of FIG. Although unnecessary processing is omitted in the explanation of the basic configuration, the processing described with reference to FIG. 16 is provided in each part.
- the multiplexing section 211c includes a precoding section.
- a beam is formed by this precoding unit multiplying each antenna element by an antenna weight.
- FIG. 20 is a block diagram showing an analog antenna configuration.
- FIG. 20 shows the multiplexing unit 211c, the radio transmission unit 211d, and the antenna 213 in the configuration of the base station 20 of FIG. Although unnecessary processing is omitted in the explanation of the basic configuration, the processing described with reference to FIG. 16 is provided in each part.
- the wireless transmission unit 211d includes a phase control unit.
- the beam is formed by the phase control unit rotating the signal in phase in the analog region (RF region).
- RF region analog region
- Flexible beam control is difficult because the phase is controlled in the analog region, but the configuration is simple.
- the antenna switching configuration is part of the analog antenna configuration.
- the hybrid antenna configuration is a configuration in which a digital antenna configuration and an analog antenna configuration are combined.
- the hybrid antenna configuration includes both a phase control element in the analog domain and a phase control element in the digital domain.
- the hybrid antenna configuration has characteristics that are intermediate between the digital antenna configuration and the analog antenna configuration in terms of beamforming performance and configuration complexity.
- Embodiment 1 The configuration of the communication system 1 has been described above, but next, the communication system 1 of the present embodiment will be described in detail.
- the base station 20 performs beam control with respect to the relay device 30.
- the relay device 30 is assumed to be a smart repeater. However, as described above, the relay device 30 may be an intelligent surface.
- the base station 20 is configured to perform communication with the terminal device 40 via the relay device 30.
- the relay device 30 receives information about the beam from the base station 20.
- the information regarding the beam includes at least information regarding the beam setting of the access link (hereinafter, referred to as beam setting information or beam control information).
- the access link is a link between the relay device 30 and the terminal device 40.
- the relay device 30 controls the beam of the access link of the relay device 30 based on this beam setting information. As a result, the access link beam of the relay device 30 is appropriately controlled according to the communication environment between the relay device 30 and the terminal device 40.
- the access link beam of the relay device 30 is dynamically controlled by DCI (Downlink Control Information) for the smart repeater.
- the DCI is a physical control signal and contains information about the beam of the access link. As mentioned above, the information about the beam includes at least beam setting information.
- the base station 20 transmits PDCCH to the relay device 30 using the front hole link.
- the front hole link is a link between the base station 20 and the relay device 30.
- the PDCCH contains a DCI containing beam setting information.
- the relay device 30 decodes the PDCCH received from the base station 20 to acquire the beam setting information, and controls the beam of the access link based on the beam setting information.
- FIG. 21 is a diagram showing an example of beam control of an access link by DCI.
- the base station 20 includes the DCI for the smart repeater in the PDCCH and transmits it to the relay device 30.
- the relay device 30 acquires the beam setting information included in the DCI for the smart repeater from the received PDCCH. After that, the relay device 30 receives from the base station 20 a PDCCH including the terminal device-specific DCI and a PDSCH scheduled by the terminal device-specific DCI. Then, the relay device 30 transmits the received PDCCH and PDSCH to the terminal device 40 by using the beam based on the beam setting information.
- the beam setting information transmitted by the base station 20 to the relay device 30 includes at least one of information regarding the downlink access link beam and information regarding the uplink access link beam.
- the relay device 30 performs dynamic beam control of the downlink access link or the uplink access link based on the beam setting information.
- the downlink access link is the downlink of the access link
- the uplink access link is the downlink of the access link.
- FIG. 22 is a diagram showing an example of a dynamic beam control sequence of a downlink access link.
- the base station 20 transmits the beam setting information of the access link to the relay device 30 (step S101).
- the receiving unit 331 of the relay device 30 receives the beam setting information from the base station 20.
- the beam setting information includes the beam setting information of the downlink access link.
- the beam setting information of the downlink access link may be included in the DCI and transmitted.
- the relay device 30 sets the beam of the downlink access link based on the beam setting information received from the base station 20 (step S102).
- the communication control unit 333 of the relay device 30 controls the beam of the downlink access link based on this setting.
- the base station 20 transmits PDCCH and PDSCH to the relay device 30. Further, the relay device 30 transfers the PDCCH and PDSCH from the base station 20 to the terminal device 40 (step S103).
- the terminal device 40 receives the PDCCH and the PDSCH from the relay device 30 and performs decoding.
- the terminal device 40 transmits HARQ-ACK to the smart repeater as the decoding result of the PDSCH.
- the relay device 30 transfers HARQ-ACK from the terminal device 40 to the base station 20 (step S104).
- FIG. 23 is a diagram showing an example of a dynamic beam control sequence of a downlink access link link.
- the base station 20 transmits the beam setting information of the access link to the relay device 30 (step S201).
- the receiving unit 331 of the relay device 30 receives the beam setting information from the base station 20.
- the beam setting information includes information about the uplink access link beam. More specifically, the beam setting information includes the beam setting information of the uplink access link.
- the beam setting information of the uplink access link may be included in the DCI and transmitted. Further, the DCI format including the beam setting information of the uplink access link may be different from the DCI format including the beam setting information of the downlink access link.
- the relay device 30 sets the beam of the uplink access link based on the beam setting information received from the base station 20 (step S202).
- the communication control unit 333 of the relay device 30 controls the beam of the uplink access link based on this setting.
- the base station 20 transmits the PDCCH including the uplink grant to the relay device 30. Further, the relay device 30 transfers the PDCCH including the uplink grant from the base station 20 to the terminal device 40 (step S203).
- the terminal device 40 receives the PDCCH including the uplink grant from the relay device 30.
- the terminal device 40 transmits the PUSCH to the relay device 30 using the resource specified by the uplink grant.
- the relay device 30 transfers the PUSCH from the terminal device 40 to the base station 20. (Step S204).
- FIG. 24 is a diagram showing another example of the dynamic beam control sequence of the downlink access link.
- the base station 20 transmits the access link beam setting information and the PDCCH addressed to the terminal device 40 to the relay device 30 (step S101).
- the receiving unit 331 of the relay device 30 receives the beam setting information and the PDCCH addressed to the terminal device 40 from the base station 20.
- the beam setting information includes information about the downlink access link beam. More specifically, the beam setting information includes the beam setting information of the downlink access link.
- the relay device 30 sets the beam of the downlink access link based on the beam setting information received from the base station 20 (step S102).
- the communication control unit 333 of the relay device 30 controls the beam of the downlink access link based on this setting.
- the relay device 30 transmits the PDCCH addressed to the terminal device 40 to the terminal device 40 (step S303). Further, the base station 20 transmits the PDSCH scheduled by the PDCCH addressed to the terminal device 40 to the relay device 30 (step S304).
- the relay device 30 transfers the PDSCH from the base station 20 to the terminal device 40 (step S305).
- FIG. 25 is a diagram showing another example of the dynamic beam control sequence of the downlink access link link.
- the base station 20 transmits the access link beam setting information and the PDCCH including the uplink grant addressed to the terminal device 40 to the relay device 30 (step S401).
- the receiving unit 331 of the relay device 30 receives the beam setting information and the PDCCH including the uplink grant addressed to the terminal device 40 from the base station 20.
- the beam setting information includes information about the uplink access link beam. More specifically, the beam setting information includes the beam setting information of the uplink access link.
- the relay device 30 sets the beam of the uplink access link based on the beam setting information received from the base station 20 (step S402).
- the communication control unit 333 of the relay device 30 controls the beam of the uplink access link based on this setting.
- the relay device 30 transmits the PDCCH including the uplink grant addressed to the terminal device 40 to the terminal device 40. (Step S403).
- the terminal device 40 receives the PDCCH including the uplink grant from the relay device 30.
- the terminal device 40 transmits the PUSCH to the relay device 30 using the resource specified by the uplink grant.
- the relay device 30 transfers the PUSCH from the terminal device 40 to the base station 20. (Step S404).
- the DCI for the smart repeater is defined by (1) a terminal device-specific DCI (UE-specific DCI), (2) a terminal group common DCI (UE-group common DCI), and the like.
- UE-specific DCI terminal device-specific DCI
- UE-group common DCI terminal group common DCI
- Terminal device-specific DCI An example of a DCI for a smart repeater is a terminal device-specific DCI (smart repeater-specific DCI).
- the terminal device specific DCI may contain information about one or more beams.
- information about one beam is included in the terminal device specific DCI.
- the beam of the access link of the relay device 30 is controlled based on the information about one beam and the application timing of the beam described later.
- FIG. 26 is a diagram showing a configuration example of beam setting information by the terminal device-specific DCI.
- the beam setting information for slot # 1 is inserted into the predetermined field at the beginning, and thereafter, the beam setting information for each smart repeater (relay device 30) corresponding to each field is inserted in order.
- terminal device-specific DCI The types of terminal device-specific DCI will be described below.
- DCI format 1_0 DCI format 1-11, or DCI format 1_2 is used as the terminal device-specific DCI.
- DCI format 1_0, DCI format 1_1, or DCI having the same number of bits as DCI format 1_2 may be used.
- a new DCI format for example, DCI format 1_3 may be used as the terminal device-specific DCI.
- the downlink assignment DCI for the smart repeater includes at least a transmit beam used to transmit the PDCCH destined for the terminal 40 at the access link and the PDSCH scheduled on this PDCCH, and / or the HARQ-corresponding to this PDSCH. Contains information about a PUCCH or a receive beam used to receive a PUSCH, including an ACK.
- the relay device 30 controls the beam of the access link by using these beam setting information.
- the downlink assignment DCI for the smart repeater may include PDSCH resource information sent from the base station 20 to the relay device 30.
- the downlink assignment DCI for the smart repeater is arranged in the terminal device common search space (CSS: Common Search Space) or the terminal device specific search space (USS: UE-specific Search Space).
- the downlink assignment DCI may be located in a smart repeater-dedicated search space (SSS: Smart Repeater-specific Search Space).
- the downlink assignment DCI may be sent exclusively for smart repeaters.
- DCI is sent exclusively for smart repeaters, at least one of RNTI (Radio Network Temporary Indicator), search space, and CORESET (COntrol REsource Set) is different from the terminal device 40.
- RNTI Radio Network Temporary Indicator
- search space search space
- CORESET COntrol REsource Set
- this downlink assignment DCI may be a downlink assignment DCI for the terminal device 40.
- the downlink assignment DCI for the terminal device 40 includes the beam setting information of the access link of the relay device 30 in addition to the scheduling information for the terminal device 40.
- the uplink grant DCI can be assumed. Specifically, it can be assumed that DCI format 0_0, DCI format 0_1, or DCI format 0_1 is used as the terminal device-specific DCI. As the terminal device-specific DCI, DCI format 0_0, DCI format 0_1, or DCI having the same number of bits as DCI format 0_2 may be used. Further, a new DCI format (for example, DCI format 0_3) may be used as the terminal device-specific DCI.
- the uplink grant DCI for the smart repeater is at least information about a transmit beam used to transmit the PDCCH destined for the terminal device at the access link and / or a receive beam used to receive the PUSCH scheduled on the PDCCH. Is included.
- the relay device 30 controls the beam of the access link by using these beam setting information.
- the uplink grant DCI for the smart repeater may include the resource information of the PUSCH transferred from the smart repeater to the transmission of the base station 20.
- the uplink grant DCI for the smart repeater is arranged in the terminal device common search space (CSS: Common Search Space) or the terminal device specific search space (USS: UE-specific Search Space).
- CSS Common Search Space
- USS terminal device specific search space
- a search space dedicated to smart repeaters SSS: Smart Repeater-specific Search Space may be defined and placed there.
- this uplink grant DCI may be sent exclusively for smart repeaters.
- the DCI is sent exclusively for the smart repeater, at least one of the RNTI, the search space, and the CORESET is different from the terminal device 40.
- the uplink grant DCI for the terminal device 40 is sent separately from the DCI dedicated to the smart repeater.
- this uplink grant DCI may be an uplink grant DCI for the terminal device 40.
- the uplink grant DCI for the terminal device 40 includes the beam setting information of the access link of the relay device 30 in addition to the scheduling information for the terminal device 40.
- DCI common to terminal device groups As an example of the DCI for the smart repeater, there is a DCI common to the terminal device group (DCI common to the smart repeater group).
- the terminal device group common DCI may contain information about one or more beams for one or more smart repeaters.
- one DCI contains information about beams addressed to a plurality of smart repeaters.
- FIG. 27 is a diagram showing a configuration example of beam setting information by the terminal device group common DCI.
- the control information regarding the beam for the smart repeater # 1 is inserted into the predetermined field at the head, and then the beam setting information for each smart repeater (relay device 30) corresponding to each field is inserted in order.
- DCI format 2_0 can be assumed as an example of DCI common to the terminal device group for smart repeaters.
- DCI format 2_0 carries SFI (Slot Format Indicator).
- the SFI designates a downlink symbol, an uplink symbol, or a flexible symbol for a symbol in one or more slots.
- the SFI of the access link of the relay device 30 is carried in DCI format 2_0.
- the beam setting information of the access link of the relay device 30 is carried by the DCI format 2_0.
- the beam setting information of the access link of the relay device 30 may be applied with the information regarding the beam of the access link of the smart repeater to all the symbols regardless of the direction indicated by the SFI.
- the beam setting information of the access link of the relay device 30 may include a beam for the downlink and a beam for the uplink.
- the upstream access link beam or downlink beam setting information of the smart repeater may be applied.
- the information regarding the beam of the access link of the smart repeater may be defined in association with one or more symbols or slots.
- DCI may contain information about 14 beams. The information about each beam corresponds to each of the 14 symbols in the slot.
- DCI contains information about 10 beams. The information about each beam corresponds to each of the 10 slots in the radio frame.
- a new DCI format (for example, DCI format 2_x (x is an arbitrary integer)) can be assumed.
- the new DCI format is defined to control the beam of the access link of the repeater 30.
- the new DCI format common to terminal device groups includes at least access link beam configuration information.
- Side link DCI As an example of DCI for a smart repeater, a side link DCI (for example, DCI format 3_x (x is an arbitrary integer)) is assumed.
- the side link DCI is used when the link between the base station 20 and the relay device 30 is defined as a side link.
- the side link DCI includes at least beam setting information of the link between the relay device 30 and the terminal device 40.
- DCI dedicated to smart repeater for example, DCI format 4_x (x is an arbitrary integer)
- the DCI dedicated to the smart repeater is used for a link (front hole link) between the base station 20 and the relay device 30.
- the DCI dedicated to the smart repeater contains at least the beam setting information of the access link.
- the DCI sent to the relay device 30 is added with a CRC scrambled by a C-RNTI or an RNTI dedicated to a smart repeater (for example, SR (Smart Repeater) -RNTI).
- SR Smart Repeater
- Information about the beam is defined as the following information.
- the information about the beam includes the beam setting information of the access link of the relay device 30.
- the relay device 30 determines the beam of the access link based on the beam setting information included in the DCI.
- the beam of the downlink access link is a transmission beam for the terminal device 40 of the relay device 30.
- the following (1-1) to (1-6) can be assumed as the information regarding the beam of the downlink access link.
- (1-1) Information on Spatial Transmitter Characteristic Information of the transmission beam of the relay device 30 is defined as a spatial transmitter characteristic.
- the base station 20 can indicate the beam of the downlink access link of the relay device 30.
- the relay device 30 determines the beam of the downlink access link based on the information regarding the spatial transmission characteristic.
- the direction (elevation angle and azimuth angle) and width (half width, beam lobe) of the beam main lobe are assumed.
- the direction of the main lobe may be determined by the absolute coordinates with respect to a predetermined direction (for example, the north pole, the south pole, etc.), or the direction of the relay device 30 (for example, the direction of the antenna, the base station, etc.). It may be determined by relative coordinates with respect to (20 directions, etc.).
- the transmission beam peak direction (Transmitter (Tx) Beam peak direction) is assumed.
- the transmitted beam peak direction may be defined as the direction in which the total component of EIRP (Equivalent Isotropically Radiated Power) is maximum.
- the relay device 30 can report the spatial transmission characteristics of its own station to the base station 20 as capability information.
- Capability information of spatial transmission characteristics includes, for example, the number of beams, the shape of the beam (beam peak direction, beam width), information on the beam pattern, spherical coverage, and the like.
- the relay device 30 may be set with valid spatial transmission characteristics and invalid spatial transmission characteristics from the base station 20.
- the base station 20 can set the validity or invalidity of the beam corresponding to the spatial transmission characteristic of the relay device 30 by DCI, MAC CE and / or RRC signaling.
- the relay device 30 can use the transmission beam corresponding to the effective spatial transmission characteristic for the downlink access link.
- the relay device 30 does not use the transmission beam corresponding to the invalid spatial transmission characteristic for the downlink access link.
- TCI Transmission Configuration Indication
- the information of the transmission beam of the relay device 30 is defined as TCI (Transmission Configuration Indication).
- TCI Transmission Configuration Indication
- the QCL relationship with the SS / PBCH block of the relay device 30 set in advance or the beam of the CSI-RS port of the NZP CSI-RS resource is set.
- the relay device 30 determines the transmission beam of the access link according to the instruction of the TCI state.
- the TCI state may be defined by a standard, may be set at the time of installation of the relay device 30, or may be set from the base station 20 by RRC signaling.
- the TCI state indicates the QCL between the downlink reference signal (SS / PBCH block, CSI-RS port of the NZP CSI-RS resource) of the relay device 30 and the DMRS of another reference signal or physical channel.
- the information of the transmission beam of the relay device 30 is defined by the SS / PBCH block index.
- the relay device 30 is instructed by the base station 20 to index the SS / PBCH block of the relay device 30 set in advance, so that the beam is the same as the SS / PBCH block corresponding to the index (in a QCL relationship). Is used as the transmission beam of the access link.
- the relay device 30 can report the setting information regarding the SS / PBCH block of the relay device 30 to the base station 20.
- the relay device 30 can report the capability information regarding the SS / PBCH block of the relay device 30 to the base station 20. Then, the base station 20 can set the SS / PBCH block for the relay device 30 based on the capability information. Specifically, the base station 20 tells the relay device 30 the period of the SS / PBCH block, the valid or invalid of the SS / PBCH block in the SS / PBCH block burst, and / or the SS / PBCH block and the transmission beam. Relationship with (QCL) can be set.
- QCL Relationship with
- the information of the transmission beam of the relay device 30 is defined by the NZP CSI-RS resource ID.
- the relay device 30 is the same as the CSI-RS port of the NZP CSI-RS resource corresponding to the ID (in a QCL relationship) by instructing the preset NZP CSI-RS resource ID from the base station 20.
- the beam is used as the transmission beam of the access link.
- the relay device 30 can report the setting information regarding the NZP CSI-RS resource of the relay device 30 to the base station 20.
- the setting information regarding the NZP CSI-RS resource of the relay device 30 is, for example, the cycle of the NZP CSI-RS resource, the arrangement of the NZP CSI-RS resource, the information of the NZP CSI-RS port, and the information regarding the NZP CSI-RS port and the transmission beam. , And so on.
- the relay device 30 can report the capability information regarding the NZP CSI-RS resource of the relay device 30 to the base station 20. Then, based on the capability information, the base station 20 can set the NZP CSI-RS resource for the relay device 30.
- the information of the transmission beam of the relay device 30 is defined by the antenna port of the downlink reference signal.
- the CSI-RS is defined from the number 3000
- the SS / PBCH block is defined from the number 4000.
- the relay device 30 can be set.
- the same (QCL-related) beam as the SS / PBCH block or NZP CSI-RS corresponding to the antenna port is used as the transmission beam of the access link.
- the information of the transmission beam of the relay device 30 is defined as information for designating the terminal device 40 (hereinafter referred to as terminal designation information).
- the base station 20 notifies the relay device 30 of the terminal designation information.
- the relay device 30 sets an appropriate transmission beam based on the received terminal designation information.
- the appropriate transmit beam may be preset, estimated by the relay device 30, or specified by the base station 20. Examples of the terminal designation information include C-RNTI.
- the information of the above transmission beam is the reception beam (the beam of the downlink). It can be used to specify the beam of the uplink access link).
- the reciprocity of the propagation path channel reciprocity
- the TDD band, the unlicensed band, the center frequency and bandwidth of the uplink and the downlink are the same, and there is a correlation with the characteristics of the propagation path of the uplink and the downlink. In some cases, at least one of the conditions such as is satisfied.
- the beam of the uplink access link is a reception beam for the terminal device 40 of the relay device 30.
- the following (2-1) to (2-3) can be assumed as the information regarding the beam of the downlink access link.
- (2-1) Information on Spatial Reception Characteristic Information of the reception beam of the relay device 30 is defined as a spatial reception characteristic (Spatial Receiver characteristic).
- a spatial reception characteristic Spatial Receiver characteristic
- the relay device 30 determines the beam of the uplink access link based on the information regarding the spatial reception characteristic.
- the direction (elevation angle and azimuth angle) and width (half width, beam lobe) of the beam main lobe are assumed.
- the direction of the main lobe may be determined by the absolute coordinates with respect to a predetermined direction (for example, the north pole, the south pole, etc.), or the direction of the relay device 30 (for example, the direction of the antenna, the base station, etc.). It may be determined by relative coordinates with respect to (20 directions, etc.).
- the receive beam peak direction (Receiver (Rx) Beam peak direction) is assumed.
- the received beam peak direction is defined as the direction in which the total component of EIRP (Equivalent Isotropically Radiated Power) is maximum.
- the relay device 30 can report the spatial reception characteristics of its own station to the base station 20 as capability information.
- Capability information of spatial reception characteristics includes, for example, the number of beams, the shape of the beam (beam peak direction, beam width), information on the beam pattern, spherical coverage, and the like.
- the relay device 30 may be set with valid spatial reception characteristics and invalid spatial reception characteristics from the base station 20.
- the base station 20 can set the validity or invalidity of the beam corresponding to the spatial reception characteristic of the relay device 30 by DCI, MAC CE and / or RRC signaling.
- the spatial reception characteristic is instructed to be enabled, the transmit beam corresponding to the valid spatial reception characteristic can be used for the uplink access link.
- the spatial reception characteristic is instructed to be disabled (disabled, deactivated)
- the received beam corresponding to the invalid spatial reception characteristic is not used for uplink access link transmission.
- SRI SRS resource indicator
- the information of the received beam of the relay device 30 is defined as the information for designating the terminal device 40.
- the base station 20 notifies the relay device 30 of the information designating the terminal device 40.
- the relay device 30 sets an appropriate reception beam based on the information designating the received terminal device 40.
- the appropriate receive beam may be preset, estimated by the relay device 30, or specified by the base station 20. Examples of the information for designating the terminal device 40 include C-RNTI.
- the above-mentioned reception beam (upstream access link beam) information is the transmission beam (the beam of the uplink access link). It can be used to specify the beam of the downlink access link).
- the reciprocity of the propagation path (channel reciprocity) is established, the TDD band, the unlicensed band, the center frequency and bandwidth of the uplink and the downlink are the same, and there is a correlation with the characteristics of the propagation path of the uplink and the downlink. In some cases, at least one of the conditions such as is satisfied.
- Application period of beam setting The beam specified by DCI may be provided with an application period of the setting.
- the repeater 30 applies the beam settings (transmit beam settings and / or receive beam settings) specified by DCI during this application period. During the rest of the application period, the repeater 30 does not apply the beam settings specified by DCI. Control regarding the application of this beam setting is executed, for example, by the communication control unit 333 of the relay device 30. This facilitates beam management of the access link by the base station 20, which enables more efficient operation of wireless communication.
- the following is an example of how to specify the application period of the beam setting based on the DCI information.
- the designation method the following (1) designation of the application period of the beam setting by the information of DCI, and (2) designation of the application period of the beam setting by the transmission timing and the parameter of DCI can be assumed.
- Base station 20 designates an application period of beam setting by DCI information.
- the DCI contains information that explicitly or implicitly specifies the application period of the beam setting (hereinafter, also referred to as information indicating the application period of the beam setting).
- the specifying unit 332 of the relay device 30 specifies the application period of the beam setting based on the information contained in the DCI.
- the communication control unit 333 of the relay device 30 applies the transmission beam and / or the reception beam designated by the base station 20 only during the specified period.
- the following is a list of specific examples of information indicating the application period of the beam settings included in DCI.
- the information indicating the application period of the beam setting can be regarded as a kind of information regarding the beam.
- (1-1) Information specifying one or more consecutive slots and / or symbols As an example of information indicating the applicable period of the beam setting contained in the DCI, one or more consecutive slots and / or symbols are used. The information you specify is recalled. The DCI contains information indicating consecutive slots and / or symbols. In the section indicated by the information indicating the continuous slot and / or symbol, the relay device 30 applies the transmission beam and / or the reception beam specified by the base station 20. At other times, the relay device 30 does not apply the beam specified by the base station 20.
- FIG. 28 is a diagram showing an example of information indicating the application period of the beam setting by DCI.
- a DCI containing beam setting information and information on the beam application period in which slot # 1 is specified is sent in slot # 0.
- the relay device 30 receives the DCI and applies the beam specified in slot # 1.
- the specified beam is not applied to slots other than slot # 1 (here, slot # 0 and slot # 2).
- (1-2) Period in which the physical channel containing the control information and data to be transferred is allocated As another example of the information indicating the application period of the beam setting by DCI, the physical channel containing the control information and data to be transferred is assigned. The information of the specified period is recalled.
- the information indicating the application period of the beam setting by DCI is the information of the period in which the PDCCH and PDSCH to be transferred to the access link are allocated, and the period in which the PUCCH or PUSCH including HARQ-ACK corresponding to the PDSCH is allocated. May be good.
- the DCI for the relay device 30 includes information on the transmission period of the PDCCH to be transferred and the transmission period of the PDSCH to be transferred.
- the information of the transmission period of the PDCCH to be transferred is, for example, the information of the CORESET (the number of symbols of the CORESET) in which the slot in which the PDCCH to be transferred is sent and the PDCCH to be transferred are placed.
- the information of the transmission period of the PDSCH to be transferred is, for example, the information of TDRA (time domain resource allocation) of the PDSCH.
- the TDRA information is represented by SLIV (Start and length Indicator Value), which is information indicating a combination of a start symbol and a symbol length.
- FIG. 29 is a diagram showing another example of information indicating the application period of the beam setting by DCI.
- the base station 20 transmits a DCI containing at least one of the following information (A1) to (A6) to the relay device 30 in slot # 0.
- A1 Beam setting information corresponding to CORESET in which PDCCH including DCI addressed to the terminal device 40 is arranged
- A2 Beam setting information corresponding to PDSCH
- A3) Beam setting information corresponding to PUCCH including HARQ-ACK
- A4) CORESET resource information
- the relay device 30 receives the DCI and applies the beam specified in each of the periods shown in (B1) to (B5) below. The relay device 30 does not apply the beam specified by the base station 20 except during these periods.
- the information indicating the application period of the beam setting by DCI may be the information of the period to which the PDCCH to be transferred to the access link is assigned and the period to which the PUSCH is assigned.
- the DCI for the smart repeater includes information on the transmission period of the PDCCH to be transferred and the reception period of the PUSCH to be transferred.
- the transmission period of the PDCCH to be transferred is, for example, the information of the CORESET (the number of symbols of the CORESET) in which the slot in which the PDCCH to be transferred is sent and the PDCCH to be transferred are placed.
- the reception period of the PUSCH to be transferred is, for example, TDRA (time domain resource allocation) information of the PUSCH.
- FIG. 30 is a diagram showing an example of information indicating the application period of the beam setting by DCI.
- the base station 20 transmits a DCI containing at least one of the following information (C1) to (C6) to the relay device 30 in slot # 0.
- C1 Beam setting information corresponding to CORESET in which PDCCH including DCI addressed to the terminal device 40 is arranged
- C2 Beam setting information corresponding to PUSCH
- C3 CORESET resource information
- C4 Scheduling information of PUSCH
- the relay device 30 receives the DCI and applies the beam specified in each of the periods shown in (D1) to (D2) below. The relay device 30 does not apply the specified beam outside these periods.
- the beam setting application period can also be specified by DCI transmission timing and other parameters.
- the identification unit 332 of the relay device 30 specifies the application period of the beam setting based on the transmission timing of the DCI and other parameters.
- the communication control unit 333 of the relay device 30 applies the transmission beam and / or the reception beam specified by the DCI only during the specified period.
- the repeater 30 does not apply the transmit and / or receive beam specified by DCI during the rest of the period.
- the application period of the beam setting is specified by the transmission timing of DCI and the timer.
- the relay device 30 starts the timer after receiving the DCI including the beam setting information.
- the relay device 30 starts the timer after the lapse of a predetermined offset period after receiving the DCI including the beam setting information.
- the predetermined offset period may be zero.
- the relay device 30 applies the beam specified by DCI during the period from the start of the timer to the expiration of the timer. On the other hand, the relay device 30 does not apply the beam specified by DCI after the timer expires.
- the timer that determines the beam setting application period is reduced by a predetermined unit.
- the predetermined unit may be an hour unit.
- the predetermined unit may be a radio frame unit, a subframe unit, a slot unit, or a symbol unit.
- the predetermined unit may be the number of times.
- the predetermined unit may be the number of CORESET occasions or the number of search spaces.
- the initial value of the timer that determines the beam setting application period may be set in advance or may be set by an upper layer (for example, RRC signaling).
- the timer for determining the beam setting application period may be a dedicated timer defined for determining the beam setting application period.
- the timer may be a beam setting timer or a beam inactive timer.
- the timer for determining the beam setting application period may be a timer used for other purposes.
- the timer may be a BWP (Bandwidth Part) inactive timer or an SS (Search Space) switching timer.
- the BWP inactive timer determines the application period of the beam setting at the same time as the application period of the active BWP. With the start of the BWP inactive timer, the BWP is switched to the predetermined BWP. Then, the beam of the access link of the corresponding relay device 30 is applied in the switched BWP. When the BWP inactive timer expires, the switched BWP falls back to the default BWP and the application of the specified beam setting is stopped.
- the beam setting is updated and the value of the timer for determining the beam setting application period is initialized.
- FIG. 31 is a diagram showing how the application period of the beam setting is specified by the transmission timing and parameters of DCI.
- the relay device 30 After receiving the DCI containing the beam setting information, the relay device 30 starts applying the beam setting and the timer after a predetermined period. In the example of FIG. 31, after receiving the DCI including the beam setting information in slot # 0, the relay device 30 starts applying the beam setting and starting the timer from the beginning of slot # 1, which is the next slot. In the example of FIG. 31, the timer starts at 1 and decreases by 1 for each slot. Then, the relay device 30 stops applying the beam setting behind the slot # 2, which is the slot where the timer has reached 0 (the slot where the timer has expired).
- the application period of beam setting is specified by the transmission timing of DCI and the predetermined timing.
- the relay device 30 applies the beam specified by the DCI for a period from the reception of the DCI including the beam setting information to a predetermined timing predetermined.
- the relay device 30 applies the beam specified by the DCI for a period from the time when the DCI including the beam setting information has elapsed and the predetermined offset period has elapsed until the predetermined timing.
- the predetermined offset period may be zero.
- the relay device 30 does not apply the beam specified by DCI.
- the following is a list of specific examples of specifying the application period of the beam setting at a predetermined timing.
- the relay device 30 From the reception of the DCI including the beam information to the reception of the DCI including the next beam information The relay device 30 receives the DCI including the beam setting information and after a predetermined offset period elapses. , The beam specified by the previously received DCI is applied for the period from the reception of the DCI including the next beam information to the lapse of a predetermined offset period. That is, the beam specified by the previously received DCI continues to be applied until the DCI containing the next beam information is received.
- FIG. 32 is a diagram showing how the application period of the beam setting is specified by the transmission timing of DCI.
- DCI including beam setting information is transmitted in slot # 0.
- the relay device 30 controls the beam from the beginning of slot # 1 based on the beam setting information received in slot # 0.
- a DCI containing the next beam setting information is transmitted in slot # 2.
- the relay device 30 applies the beam setting up to the beginning of slot # 2, which is the application timing of the next beam setting information. After that, the relay device 30 controls the beam based on the beam setting information received in slot # 2.
- the relay device 30 From the reception of the DCI including the beam setting information to the PDCCH monitoring occasion for the DCI containing the next beam setting information
- the relay device 30 receives the DCI including the beam setting information and offsets it by a predetermined value.
- the beam specified by the previously received DCI is applied during the period from the elapse of the period to the PDCCH monitoring occasion for the DCI containing the next beam setting information. That is, regardless of whether or not the next beam setting information is received, the beam specified by the previously received DCI continues to be applied until the next PDCCH monitoring occasion.
- the PDCCH monitoring occasion for DCI including beam setting information is an occasion in which DCI including beam setting information can be received.
- the PDCCH monitoring occasion is preferably set by the PDCCH monitoring cycle and time offset (e.g. monitoringSlotPeriodicityAndOffset).
- the PDCCH monitoring cycle may be set by the CORESET or search space setting information to which the DCI including the beam setting information can be transmitted. For example, when the DCI format that can include the beam setting information is set in the setting information regarding the search space, the beam setting information is applied by the PDCCH monitoring occasion.
- FIG. 33 is a diagram showing how the application period of the beam setting is specified by the PDCCH monitoring cycle.
- DCI including beam setting information is transmitted in slot # 0.
- the relay device 30 controls the beam from the beginning of slot # 1 based on the beam setting information received in slot # 0.
- the beam to which the setting is applied is applied to the beginning of slot # 3, where the instruction can be initiated by the next PDCCH monitoring occasion, regardless of whether or not a DCI containing the next beam setting information is received.
- the relay device 30 is from the time after the predetermined offset period after the DCI including the beam setting information is received to the fixed timing.
- the beam specified by DCI is applied for the period.
- the fixed timing includes, for example, a radio frame boundary, a half frame boundary, a subframe boundary, a slot boundary, and the like. After the fixed timing, the beam specified by DCI does not apply.
- the fixed timing may be set in advance, may be determined by a standard, or may be set from the upper layer (RRC signaling).
- the fixed timing is preferably set independently of PDCCH monitoring by cycle and time offset.
- the reception timing of the downlink physical signal / physical channel at the front hole link and the transmission timing of the downlink physical signal / physical channel at the access link may be specified independently. Further, the transmission timing of the uplink physical signal / physical channel on the front hole link and the reception timing of the uplink physical signal / physical channel on the access link may be specified independently.
- the relay device 30 includes a buffer that holds the received downlink physical signal / physical channel and uplink physical signal / physical channel until the transmission timing.
- FIG. 34 is a sequence diagram for explaining the relay timing of the physical signal / physical channel.
- the base station 20 After transmitting the beam control information (beam setting information) to the relay device 30 (step S501), the base station 20 further transmits the PDCCH / PDSCH addressed to the terminal device 40 to the relay device 30 (step S502).
- the relay device 30 transmits the PDCCH / PDSCH addressed to the terminal device 40 to the terminal device 40 at a predetermined timing (step S503).
- the terminal device 40 Upon receiving the PDCCH / PDSCH, the terminal device 40 transmits HARQ-ACK to the relay device 30 (step S504).
- the relay device 30 transmits HARQ-ACK to the base station 20 at a predetermined timing (step S505).
- the relay device 30 does not have to immediately transfer the physical signal / physical channel received from the base station 20 to the terminal device 40. That is, even if the timing at which the relay device 30 receives the PDCCH / PDSCH addressed to the terminal device 40 from the base station 20 and the timing at which the relay device 30 transmits the PDCCH / PDSCH addressed to the terminal device 40 to the terminal device 40 are different. good. Further, the timing at which the relay device 30 receives the HARQ-ACK from the terminal device 40 and the timing at which the relay device 30 transmits the HARQ-ACK to the base station 20 may be different.
- the relay timing may be specified by the base station 20.
- the receiving unit 331 of the relay device 30 receives information regarding the designation of the relay timing (hereinafter, referred to as relay timing designation information) from the base station 20. Then, the communication control unit 333 of the relay device 30 relays the information (physical signal / physical channel) at the timing specified based on the relay timing designation information.
- the reception timing of downlink physical signal / physical channel at the front hole link may be specified by DCI including beam setting information.
- the PDCCH and / or PDSCH receive slot destined for the terminal device 40 on the front hole link is designated by the DCI containing the beam setting information.
- the reception timing of the downlink physical signal / physical channel in the front hole link may be specified by a DCI different from the DCI including the beam setting information.
- the receiving slot of the PDSCH addressed to the terminal device 40 in the front hole link may be designated by the DCI addressed to the terminal device 40.
- the relay device 30 can decode the PDCCH addressed to the terminal device 40.
- the PDCCH and PDSCH reception slots destined for the terminal device 40 in the front hall link may be designated by the DCI destined for the relay device 30.
- the reception timing of the downlink physical signal / physical channel in the front hall link may be the transmission beam setting application period of the access link.
- the reception timing of the downlink physical signal / physical channel in the front hole link is the timing specified as the downlink in the TDD setting of the front hole link.
- the transmission timing of the downlink physical signal / physical channel in the front hole link may be specified by DCI including beam setting information.
- the PDCCH transmission slot on the access link may be designated by a DCI containing beam setting information.
- the transmission timing of the downlink physical signal / physical channel in the access link may be specified by a DCI different from the DCI including the beam setting information.
- the PDSCH transmission slot on the access link may be designated by the DCI destined for the terminal device 40.
- the relay device 30 can decode the PDCCH addressed to the terminal device 40.
- the transmission timing of the downlink physical signal / physical channel on the access link may be the transmission beam setting application period of the access link.
- the transmission timing of the downlink physical signal / physical channel in the access link is the latest from the timing when the downlink physical signal / physical channel is received among the resources specified as the downlink in the TDD setting of the access link. It may be a downlink resource of.
- the transmission timing of the downlink physical signal / physical channel on the access link may be approximately the same as the reception timing of the downlink physical signal / physical channel on the front hole link.
- the reception slot of the downlink physical signal / physical channel in the front hole link and the transmission slot of the downlink physical signal / physical channel in the access link may be the same.
- the downlink is not transmitted in the access link at a timing other than the above.
- the transmission timing of uplink physical signal / physical channel at the front hole link may be specified by DCI including beam setting information.
- the PUSCH transmit slot on the front hole link may be designated by a DCI containing beam setting information.
- the transmission timing of the uplink physical signal / physical channel in the front hole link may be specified by a DCI different from the DCI including the beam setting information.
- the transmission slot of the PUSCH from the terminal device 40 in the front hole link may be designated by the DCI addressed to the terminal device 40.
- the relay device 30 can decode the PDCCH addressed to the terminal device 40.
- the transmission slot of the PUSCH from the terminal device 40 in the front hole link may be designated by the DCI addressed to the relay device 30.
- the transmission timing of the uplink physical signal / physical channel in the front hole link may be the reception beam setting application period of the access link.
- the transmission timing of the uplink physical signal / physical channel in the front hole link is the timing at which the uplink physical signal / physical channel is received among the resources specified as the uplink in the TDD setting of the front hole link. It may be the latest uplink resource from.
- the uplink is not transmitted at the front hole link at a timing other than the above.
- the reception timing of uplink physical signal / physical channel at the front hole link may be specified by DCI including beam setting information.
- the PUSCH receive slot on the access link may be designated by a DCI containing beam setting information.
- the reception timing of the uplink physical signal / physical channel in the access link may be specified by a DCI different from the DCI including the beam setting information.
- the receiving slot of the PUSCH in the access link may be designated by the DCI addressed to the terminal device 40.
- the relay device 30 can decode the PDCCH addressed to the terminal device 40.
- the reception timing of the uplink physical signal / physical channel on the access link may be the reception beam setting application period of the access link.
- the reception timing of the uplink physical signal / physical channel in the access link may be the timing specified as the uplink in the TDD setting of the access link.
- the reception timing of the uplink physical signal / physical channel on the access link may be approximately the same as the transmission timing of the uplink physical signal / physical channel on the front hole link.
- the transmission slot of the uplink physical signal / physical channel in the front hole link and the reception slot of the uplink physical signal / physical channel in the access link may be the same.
- the low-priority uplink physical signal / physical channel may not be transmitted, may be transmitted with low transmission power, or may be transmitted at another uplink transmission opportunity.
- FIG. 35 is a diagram showing an example of priority handling of uplink physical signals / physical channels between terminal devices 40.
- the terminal device 40 1 is the UE 1 and the terminal device 402 is the UE 2 .
- the base station 20 transmits beam control information (beam setting information) to the relay device 30 (step S601). After that, the base station 20 transmits the PDCCH addressed to the terminal device 40 1 to the terminal device 40 1 via the relay device 30 (step S602). Further, the base station 20 transmits the PDCCH addressed to the terminal device 401 2 to the terminal device 402 via the relay device 30 (step S603). Upon receiving the PDCCH, the terminal device 40 1 transmits the PUSCH to the relay device 30 (step S604).
- beam control information beam setting information
- the terminal device 402 transmits the PUSCH to the relay device 30 (step S605).
- the relay device 30 determines whether or not it is difficult to transfer the two PUSCHs to the base station 20.
- the relay device 30 performs a priority handling process (step S606).
- the relay device 30 transfers only the PUSCH from the terminal device 401 to the base station 20 based on the priority handling process (step S607).
- An example of an element that determines the priority of an uplink physical signal / physical channel is the type of physical signal / physical channel.
- the priority may be set as PRACH> PUCCH> PUSCH> SRS.
- the priority may be set as PUSCH containing UCI> PUSCH not containing UCI. Further, the priority may be set as the physical channel containing UCI carrying HARQ-ACK> the physical channel containing UCI not carrying HARQ-ACK. Further, the priority may be set as the physical channel including UCI carrying LRR (Link Recovery Request)> the physical channel containing UCI not carrying LRR.
- LRR Link Recovery Request
- an example of a factor that determines the priority of an uplink physical signal / physical channel is the type of serving cell.
- the priority may be set as uplink physical signal / physical channel of the primary cell> uplink physical signal / physical channel of the secondary cell.
- the priority may be set as the uplink physical signal / physical channel of the serving cell belonging to the MCG (Master Cell Group)> the uplink physical signal / physical channel of the serving cell belonging to the SCG (Secondary Cell Group).
- L1 priority is an example of a factor that determines the priority of the uplink physical signal / physical channel.
- the priority may be set as PUSCH designated as high priority by the priority index> PUSCH designated as low priority by the priority index.
- An example of a factor that determines the priority of an uplink physical signal / physical channel is the order in which they are received. For example, the priority may be set as first received physical signal / physical channel> later received physical signal / physical channel.
- QoS Quality of Service
- the priority may be set as PUSCH> other PUSCHs that carry data to which 5QI defined as a delayed critical GBR (Guaranteed Bit Rate) is mapped.
- 5QI defined as a delayed critical GBR (Guaranteed Bit Rate)
- BWP switching> It is desirable that the BWP for receiving the DCI including the beam setting information (for example, BWP # 0) and the BWP for transferring to the terminal device 40 (for example, BWP # 1) are different. Specifically, it is desirable that BWP # 0 has a narrower band than BWP # 1.
- the DCI including the beam setting information includes the information (bandwidth part indicator) for switching the BWP. As a result, it is possible to suppress the power consumption required for PDCCH monitoring of DCI including beam setting information.
- the BWP of the front hole link and the BWP of the access link of the relay device 30 may be the same or different.
- the relay device 30 can switch between the BWP of the front hole link and the BWP of the access link at the same time. At this time, the BWP of the front hole link and the BWP of the access link may be changed by the DCI including the beam setting information.
- the relay device 30 can independently switch between the BWP of the front hole link and the BWP of the access link.
- the BWP of the front hole link may be changed by the DCI including the beam setting information
- the BWP of the access link may be changed by the DCI of the PDCCH addressed to the terminal device 40.
- FIG. 36 is a diagram showing an example of BWP (bandwidth part) switching of the relay device 30 by DCI including beam setting information.
- the relay device 30 monitors the PDCCH of the DCI including the beam setting information at BWP # 0. Then, the relay device 30 receives the DCI including the beam setting information and the information for switching the BWP.
- the relay device 30 switches to the second BWP after opening a predetermined switching gap based on the information for switching the BWP, and then transfers the physical signal / physical channel to the terminal device 40.
- the base station 20 can control the transmission power of the downlink access link in addition to the beam control of the access link. This may be done by the base station 20 controlling the relay device 30 by the DCI including the beam setting information. For example, the base station 20 designates the transmission power of the PDCCH and PDSCH to the terminal device 40 to be transmitted later to the relay device 30 by the information regarding the downlink transmission power included in the DCI including the beam setting information.
- the information regarding the downlink transmission power may be the value of the transmission power of the access link.
- the information regarding the downlink transmission power may be the ratio of the reception power of the front hole link to the transmission power of the access link (the amount of signal amplification).
- the information regarding the downlink transmission power may be the ratio of the transmission power of the access link SSB or CSI-RS to the transmission power of the DMRS of the access link PDCCH and PDSCH.
- Embodiment 2 >> Next, the communication system 1 of the second embodiment will be described.
- the beam of the access link of the relay device 30 is dynamically controlled, but in the second embodiment, it is controlled quasi-statically.
- the base station 20 sets beam pattern information for the relay device 30 by RRC signaling (SIB (System Information Block) or dedicated RRC signaling), MAC CE, and / or DCI.
- the relay device 30 controls the beam of the access link of the relay device 30 based on the set beam pattern information.
- the beam pattern is composed of a plurality of beams arranged along the time axis, and the beam pattern information is a set of information regarding the plurality of beams.
- the information regarding the beam may be the beam setting information (beam control information) described in the first embodiment.
- the beam pattern information may be composed of a plurality of beam setting information.
- the base station 20 transmits the beam pattern information of the access link to the relay device 30 at the front hall link.
- the relay device 30 controls the beam of the access link based on this beam pattern information.
- This quasi-static beam control is preferably applied to physical channels / physical signals to which resources are periodically allocated.
- Physical channels / signals to which resources are periodically allocated include, for example, SSB (SS / PBCH block), CSI-RS, PRACH, periodic PUCCH, periodic SRS, SPS (Semi-Persistent Scheduling) -PDSCH, or. , CG (Configured Grant) -PUSCH, PDCCH and CORESET.
- the beam setting information constituting the beam pattern information is associated with the time resource.
- each beam setting information constituting the beam pattern information is associated with, for example, a slot.
- FIG. 37 is a diagram showing an example of the relationship between the beam of the access link of the relay device 30 and the slot.
- the beam pattern information is composed of five beam setting information.
- the first beam setting information corresponds to slot # 0
- the second beam setting information corresponds to slot # 1
- the third beam setting information corresponds to slot # 2
- the fourth beam setting information corresponds to slot # 1.
- the fifth beam setting information corresponds to slot # 4.
- the relay device 30 applies the transmit beam and / or the receive beam of the access link based on the associated beam setting information.
- the beam pattern has periodicity, and five beam setting information is repeatedly applied after slot # 5.
- Examples of the means for notifying the beam setting information constituting the beam pattern information include RRC signaling (SIB or dedicated RRC signaling), MAC CE, and / or DCI common to the terminal device group. These notification means may be applied in combination.
- RRC signaling may preset a set of multiple beam patterns and DCI may specify one of the set of beam patterns.
- the first embodiment and the second embodiment may be applied in combination.
- the beam pattern is set quasi-statically, and at some timings, the beam setting may be overwritten by the beam setting information notified by DCI.
- Default operation of beam control of access link> A default setting may be prepared as the beam setting of the access link.
- the default setting is the setting of the default operation of the beam control of the access link.
- the default operation of the beam of the access link will be described below.
- the relay device 30 applies the default setting when the current state becomes a predetermined state. For example, when one or more of the following states occur, the relay device 30 sets the beam setting of the access link as the default setting.
- the relay device 30 When the decoding of the PDCCH or PDSCH containing the beam setting information fails
- the relay device 30 fails to decode the PDCCH or PDSCH containing the beam setting information, the relay device 30 applies the default setting.
- (1) can be applied when the relay device 30 knows in advance that the PDCCH or PDSCH including the beam setting information is transmitted.
- the relay device 30 is known in advance, there are cases where another PDCCH or another PDSCH notifies in advance that the PDCCH or PDSCH will be sent, or where the occasion is determined by the cycle. Recall.
- the relay device 30 applies the default setting when the beam setting information for a predetermined period or a predetermined number of times has not been received.
- the predetermined period is determined by, for example, a slot or a wireless frame.
- the predetermined number of times is determined by, for example, a PDCCH monitoring occasion.
- the predetermined period and the predetermined number of times may be set by the upper layer.
- the relay device 30 applies the default setting when the timer for applying the beam setting (for example, the beam setting timer and the BWP inactive timer) expires.
- the relay device 30 applies the default setting when the resource specified by the base station 20 is a resource outside the beam application section.
- Stopping transmission / reception of access links As a default operation, it is assumed that transmission / / or reception of access links is stopped. When the default setting is applied, the relay device 30 stops the transmission of the access link and does not transfer any downlink physical signal / physical channel. Further, when the default setting is applied, the relay device 30 stops the reception of the access link and does not transfer any uplink physical signal / physical channel.
- the relay device 30 may perform an operation of reflecting radio waves in a direction that does not cause interference as a default operation.
- Specific examples of the reflection direction of radio waves that do not cause interference include reflection in the direction of arrival, reflection in the direction of the sky or the ground, and reflection in a direction in which a preset probability of interference is low.
- the relay device 30 has, as a default operation, an operation of absorbing radio waves so as not to give interference, an operation of phase-controlling and diffusing reflected radio waves so as to weaken each other, and an incident. The operation of transmitting or absorbing the transmitted radio waves may be performed.
- the relay device 30 may perform an operation of applying the previously set beam as a default operation. That is, the relay device 30 may perform an operation of continuing to use the beam of the access link applied immediately before as a default operation.
- the relay device 30 may perform an operation of applying a beam pattern preset as a default beam pattern as a default operation.
- the default beam pattern may be set at the time of installation of the relay device 30, or may be set in the upper layer.
- the uplink physical signal transmitted from the terminal device 40 is amplitude, frequency, phase, or polarization modulated. , HARQ-ACK information is superimposed.
- the base station 20 transmits a side link transmission beam and / or a reception beam to the terminal device 40.
- the beam setting information to be controlled can be provided in DCI (DCI format 3_x (x is an arbitrary integer)).
- the beam setting information provision and the beam setting information setting can be realized by using the method described in the first embodiment.
- the effect obtained in the first embodiment or the second embodiment can be similarly obtained in the side link.
- control device for controlling the management device 10, the base station 20, the relay device 30, and the terminal device 40 of the present embodiment may be realized by a dedicated computer system or a general-purpose computer system. good.
- a communication program for executing the above operation is stored and distributed in a computer-readable recording medium such as an optical disk, a semiconductor memory, a magnetic tape, or a flexible disk.
- the control device is configured by installing the program in a computer and executing the above-mentioned processing.
- the control device may be an external device (for example, a personal computer) of the management device 10, the base station 20, the relay device 30, and the terminal device 40.
- the control device may be an internal device (for example, control unit 13, control unit 23, control unit 33, control unit 43) of the management device 10, the base station 20, the relay device 30, and the terminal device 40.
- the above communication program may be stored in a disk device provided in a server device on a network such as the Internet so that it can be downloaded to a computer or the like.
- the above-mentioned functions may be realized by cooperation between the OS (Operating System) and the application software.
- the part other than the OS may be stored in a medium and distributed, or the part other than the OS may be stored in the server device so that it can be downloaded to a computer or the like.
- each component of each device shown in the figure is a functional concept, and does not necessarily have to be physically configured as shown in the figure. That is, the specific form of distribution / integration of each device is not limited to the one shown in the figure, and all or part of them may be functionally or physically distributed / physically in arbitrary units according to various loads and usage conditions. Can be integrated and configured. The configuration by this distribution / integration may be dynamically performed.
- the present embodiment includes a device or any configuration constituting the system, for example, a processor as a system LSI (Large Scale Integration), a module using a plurality of processors, a unit using a plurality of modules, and a unit. It can also be implemented as a set or the like (that is, a configuration of a part of the device) to which other functions are added.
- a processor as a system LSI (Large Scale Integration)
- a module using a plurality of processors a unit using a plurality of modules
- a unit that is, a configuration of a part of the device
- the system means a set of a plurality of components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Therefore, a plurality of devices housed in separate housings and connected via a network, and a device in which a plurality of modules are housed in one housing are both systems. ..
- the present embodiment can have a cloud computing configuration in which one function is shared by a plurality of devices via a network and jointly processed.
- the relay device 30 is a communication device (for example, a smart repeater) that relays communication between the base station 20 and the terminal device 40.
- the relay device 30 is a physical control signal (that is, a physical control signal used for controlling the physical layer of the relay device 30) including information about a beam (that is, an access link beam) used for communication between the relay device 30 and the terminal device 40.
- DCI is received from the base station 20.
- the relay device 30 controls the beam used for communication between the relay device 30 and the terminal device 40 based on the information about the beam.
- the present technology can also have the following configurations.
- a communication device that relays communication between a base station and a terminal device. Receiving from the base station the physical control signal used to control the physical layer of the communication device and including information about a beam used for communication between the communication device and the terminal device. Department and A communication control unit that controls a beam used for communication between the communication device and the terminal device based on the information about the beam.
- the information about the beam includes information about the beam setting between the communication device and the terminal device.
- the information regarding the beam setting includes at least one of information regarding a downlink beam which is a beam of the communication device to the terminal device and information about an uplink beam which is a beam of the terminal device to the communication device. included, The communication device according to (1) above.
- the information regarding the downlink beam includes information regarding spatial transmission characteristics, TCI (Transmission Configuration Indication), SS / PBCH block index, NZP CSI-RS resource ID, downlink reference signal antenna port, and information specifying a terminal device. At least one of them, The communication device according to (2) above.
- the information regarding the uplink beam is information regarding spatial reception characteristics, SRI (SRS resource indicator), or information for designating a terminal device.
- the information about the beam includes information indicating the applicable period of the beam setting.
- the communication control unit performs control based on the beam setting for a period specified based on the information indicating the application period of the beam setting.
- the information indicating the application period of the beam setting includes information specifying at least one of one or more consecutive slots and one or more consecutive symbols as the application period of the beam setting.
- the information indicating the application period of the beam setting includes information for designating the period to which the physical channel including the transfer information to the base station or the terminal device is assigned as the application period of the beam setting.
- the information indicating the application period of the beam setting includes the period to which the PDCCH and PDSCH to be transferred to the access link, which is the link between the communication device and the terminal device, are assigned, and the HARQ-ACK corresponding to the PDSCH.
- the communication device Contains information for at least one of the PUCCH or the period to which the PUSCH is assigned.
- the communication device according to (7) above.
- the information indicating the application period of the beam setting includes information on at least one of the period in which the PDCCH to be transferred to the access link is assigned and the period in which the PUSCH is assigned.
- the communication device according to (7) above.
- a specific unit that specifies an application period of the beam setting based on at least one of the transmission timing and the parameter of the physical control signal.
- the communication control unit performs control based on the beam setting for a period specified by the specific unit.
- the communication device according to any one of (2) to (4) above.
- the specific unit specifies an application period of the beam setting based on a timer.
- the communication device specifies an application period of the beam setting based on the transmission timing of the physical control signal.
- the communication device specifies (13)
- the specific unit received the physical control signal including the next information on the beam setting after receiving or receiving the physical control signal including the information on the beam setting and after a predetermined offset period has elapsed. The period after receiving or until after the lapse of a predetermined offset period is specified as the applicable period of the beam setting.
- the specific unit After receiving the physical control signal containing the information regarding the beam setting or after the elapse of a predetermined offset period after receiving the physical control signal, the specific unit monitors PDCCH for the physical control signal containing the information regarding the next beam setting.
- the communication device Specify the period up to the occasion as the applicable period of the beam setting, The communication device according to (12) above.
- the specific unit specifies a period from the time when the physical control signal containing the information regarding the beam setting is received or after the elapse of a predetermined offset period to the fixed timing as the application period of the beam setting. , The communication device according to (12) above.
- the receiving unit receives information regarding the designation of the relay timing, and receives the information.
- the communication control unit relays information at a timing specified based on the information regarding the designation of the relay timing.
- the communication device according to any one of (1) to (15).
- the communication control unit When the communication control unit is requested to transmit information from the plurality of terminal devices to the base station at the same timing, the communication control unit transfers information of any of the plurality of the terminal devices to the other terminal according to a predetermined standard. Send in preference to device information, The communication device according to any one of (1) to (16). (18) The BWP for receiving the physical control signal containing information about the beam and the BWP for transferring to the terminal device are different. The physical control signal, including information about the beam, includes information for switching the BWP. The communication control unit switches the BWP based on the information for switching the BWP. The communication device according to any one of (1) to (17). (19) The physical control signal, including information about the beam, contains information about downlink transmit power.
- the communication control unit controls the transmission power of the downlink based on the information regarding the transmission power of the downlink.
- the communication device according to any one of (1) to (18).
- (20) A communication method executed by a communication device that relays communication between a base station and a terminal device.
- the physical control signal which is a physical control signal used for controlling the physical layer of the communication device and includes information about a beam used for communication between the communication device and the terminal device, is received from the base station. Controlling the beam used for communication between the communication device and the terminal device based on the information about the beam.
- Communication method (21) It ’s a base station, With the transmitter Has a control unit The control unit is via the transmission unit.
- a physical control signal used to control the physical layer of a communication device that relays communication between the base station and the terminal device and includes information about a beam used for communication between the communication device and the terminal device. It is configured to transmit the physical control signal to the communication device and to communicate with the terminal device via the communication device. Of the communication with the terminal device, the beam used for communication between the communication device and the terminal device is controlled based on the information about the beam. base station. (22) It ’s a base station method, A physical control signal used to control the physical layer of a communication device that relays communication between the base station and the terminal device, and includes information about a beam used for communication between the communication device and the terminal device. The physical control signal is transmitted to the communication device, and communication with the terminal device is performed via the communication device. Of the communication with the terminal device, the beam used for communication between the communication device and the terminal device is controlled based on the information about the beam. Base station method.
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Abstract
Description
LTE(Long Term Evolution)、NR(New Radio)等の無線アクセス技術(RAT:Radio Access Technology)が3GPP(3rd Generation Partnership Project)で規格化されている。LTE及びNRは、セルラー通信技術の一種であり、基地局がカバーするエリアをセル状に複数配置することで端末装置の移動通信を可能にする。このとき、単一の基地局は複数のセルを管理してもよい。
最初にNRにおけるビームフォーミングについて説明する。
NRにおいて、単一ビーム運用方式と複数ビーム運用方式の2種類の方式が想定されている。
NRにおいて、システムは、下りリンクおよび上りリンクのそれぞれ適切なビームを選択することが好ましい。具体的には、基地局の下りリンク送信ビームおよび端末装置の下りリンク受信ビームのそれぞれについて、適切なビームが選択されることが好ましい。また、端末装置の上りリンク送信ビームおよび基地局の上りリンク受信ビームのそれぞれについて、適切なビームが選択されることが好ましい。
NRにおいて、チャネル特性を表すQCL(Quasi-Co-Location)が定義される。例えば、異なる二つの信号(物理チャネル、物理信号、アンテナポート)のチャネル特性が同一であると仮定することが可能である場合、二つの信号間はQCLである。QCLで表されるチャネル特性は、ドップラーシフト、ドップラー広がり、平均遅延、遅延広がり、空間的Rxパラメータ、などが挙げられる。
(2)QCL-TypeB:{ドップラーシフト、ドップラー広がり}
(3)QCL-TypeC:{ドップラー広がり、平均遅延}
(4)QCL-TypeD:{空間的Rx(Receiver, Reception)パラメータ}
NRにおいて、下りリンクの送信ビームは所定の信号のインデックスおよびQCL(Quasi-Co-Location)によって定義される。
NRにおいて、カバレッジ拡張の要求からリレー技術の導入が期待されている。以下、リレー技術として、レイヤ1リレー(e.g., RF Repeater)、レイヤ3リレーについて簡単に説明する。
レイヤ1リレーは、基地局からの下りリンク受信RF(Radio Frequency)信号を復号せずに電力増幅して端末装置に送信するリレーである。レイヤ1リレーは、AF(Amplifier and Forward)とも呼ばれる。図3は、レイヤ1リレーの概要を示す図である。図3では下りリンクのレイヤ1リレーが示されているが、レイヤ1リレーは、上りリンクにも適用可能である。上りリンクのレイヤ1リレーでは、下りリンクのレイヤ1リレーと同様に、端末装置からの上りリンク受信RF信号を電力増幅して基地局に送信する。レイヤ1リレーの具体例としては、ブースタやリピータ(e.g., RF Repeater)が知られている。図4は、リピータのシステムの概要を示す図である。
一方、レイヤ1リレーとは異なり、レイヤ3まで復号(デコード)と再符号(エンコード)するのがレイヤ3リレーである。図5は、レイヤ3リレーの概要を示す図である。レイヤ3リレーの一つとしてIAB(Integrated Access and Backhaul link)が知られている。図6は、IABの概要を示す図である。また、図7は、IAB-MT(Mobile Termination)のRRCとNAS接続のプロトコルスタックを示す図である。IABは、バックホールを提供するIABドナーノードに対してはIAB-MT(Mobile Termination)として動作し、アクセスを提供する端末装置40に対してはIAB-DU(Distributed Unit)として動作する。IABドナーノードは、例えば、基地局20でもよく、IAB-CU(Central Unit)として動作する。IABは、リレーするデータをレイヤ3まで復号するため、レイヤ3リレーとして分類されている。レイヤ3リレーは、リソース管理などの通信制御等が可能であるものの、基地局と同等の機能実装を要するため高価である。
上述したように、従来のレイヤ1リレーは装置機能が最小であるため、細かなリソース制御を行えない。一方、レイヤ3リレーは、リソース管理などの通信制御等が可能であるものの、基地局同等の機能実装を要するため高価である。そこで、近年では、安価かつビーム制御機能が搭載されたレイヤ1リレー(リピータ)の検討がなされている。ビーム制御機能が搭載されたレイヤ1リレーは、スマートリピータ(smart repeater)とも称される。
スマートリピータは、従来のレイヤ1リレー(e.g., RF repeater)に対して、更に物理層(PHY層、Physical Layer)レベルの制御を可能にしたレイヤ1リレーである。物理層レベルの制御の一例として、上りリンク/下りリンクリソース配分や、ビームフォーミング制御、などが挙げられる。スマートリピータは、物理層レベルの制御を動的に行うことで干渉を低減させる。これにより、レイヤ1リレーによるシステム効率がより改善される。
スマートリピータは、転送する情報(ユーザプレーン(U-Plane)または制御プレーン(C-Plane))に応じて、異なるプロトコルスタックの構成を有することが想定される。
基地局とスマートリピータのセルID(e.g., 物理セル識別子(PCI:Physical Cell Identifier))が同じである場合、端末装置は基地局に接続しているのかスマートリピータに接続しているのかを区別する必要がある。このため、スマートリピータのSSBやCSI-RSには、基地局のとは異なるインデックスが割り当てられる。基地局およびスマートリピータの送信ビームの組合せに対して異なるインデックスのSSBやCSI-RSを設定することで、端末装置がスマートリピータに接続する場合にも、基地局は、端末装置への適切なビームを認識することができる。
データをリレーする装置の一つとして反射板(Surface)が知られている。従来の反射板は、反射板に対する電波の入射角に対して同一の反射角にて、電波の再放射を行う。一方で、近年では、インテリジェントサーフェス(Intelligent Surface)と呼ばれる反射板も検討されている。図13は、インテリジェントサーフェスのシステムの概要を示す図である。インテリジェントサーフェス(Intelligent Surface)は、反射特性の制御が可能な複数の反射素子(Reflecting element)で構成されるメタマテリアル(メタサーフェス)である。電波の再放射の際に各反射素子の位相を変化させることで、入射角に依らず反射方向を制御する。リピータと比較して、DAC(Digital-to-Analog Converter)/ADC(Analog-to-Digital Converter)および電力増幅回路が不要である、または、簡素な回路で良いため、増幅雑音が無い、価格が安い、消費電力が低い、リレー処理遅延が短い、などの利点が挙げられる。インテリジェントサーフェスは、Large Intelligent Surface、Reflecting Surface、Reconfigurable Surface、meta-material Surfaceとも呼称される。
以上、本実施形態で登場する要素技術について説明したが、以下、本実施形態の概要を述べる。
無線通信の効率の良い運用のため、カバレッジ拡張の要求が高まっている。カバレッジ拡張の要求を満たすため、近年、リレー技術の導入が期待されている。
そこで、本実施形態では、スマートリピータを導入することで、カバレッジ(特にFR2のカバレッジ)を安価かつ容易に拡張する。より具体的には、本実施形態のスマートリピータは、スマートリピータと端末装置との間のビームに関する情報を含む物理制御信号を受信する。ここで、物理制御信号は、基地局からスマートリピータ向けのDCI(Downlink Control Information)である。スマートリピータは、ビームに関する情報に基づいて、スマートリピータと端末装置との間のビームを制御する。本実施形態のスマートリピータを導入することで、カバレッジが安価かつ容易に拡張できるので、無線通信の効率の良い運用が可能になる。
なお、本実施形態の理解を容易にするため、スマートリピータとIAB(レイヤ3リレー)との差異を述べておく。
以上、本実施形態の概要を述べたが、以下、本実施形態に係る通信システムを詳細に説明する。以下、図面を参照しながら通信システム1の構成を具体的に説明する。
図14は、本開示の実施形態に係る通信システム1の構成例を示す図である。通信システム1は、管理装置10と、基地局20と、中継装置30と、端末装置40と、を備える。通信システム1は、通信システム1を構成する各無線通信装置が連携して動作することで、ユーザに対し、移動通信が可能な無線ネットワークを提供する。本実施形態の無線ネットワークは、例えば、無線アクセスネットワークとコアネットワークとで構成される。なお、本実施形態において、無線通信装置は、無線通信の機能を有する装置のことであり、図14の例では、基地局20、中継装置30、及び端末装置40が該当する。
次に、管理装置10の構成を説明する。
次に、基地局20の構成を説明する。
次に、中継装置30の構成を説明する。
次に、端末装置40の構成を説明する。
次に、NRのアンテナ構成を説明する。以下の説明では、基地局20を例にNRのアンテナ構成を説明する。なお、以下に説明するNRのアンテナ構成は、基地局20のみならず、及び端末装置40にも適用可能である。
デジタルアンテナ構成とは、各アンテナ素子に対してデジタル回路(ベースバンド領域)によってアンテナ重みを制御する構成である。
図20は、アナログアンテナ構成を示すブロック図である。図20には、図16の基地局20の構成における多重部211c、無線送信部211d、およびアンテナ213が示されている。なお、基本構成の説明に不要な処理は省略しているが、図16で説明した処理は各部に備えている。
ハイブリッドアンテナ構成は、デジタルアンテナ構成とアナログアンテナ構成を複合した構成である。ハイブリッドアンテナ構成は、アナログ領域における位相制御素子およびデジタル領域における位相制御素子を併せ持つ。ハイブリッドアンテナ構成は、ビームフォーミングの性能と構成の複雑さに関して、デジタルアンテナ構成とアナログアンテナ構成の中間となる特徴を有する。
以上、通信システム1の構成について説明したが、次に、本実施形態の通信システム1について詳細に説明する。
本実施形態では、中継装置30のアクセスリンクビームは、スマートリピータ用のDCI(Downlink Control Information)によって、動的に制御される。DCIは、物理制御信号であり、アクセスリンクのビームに関する情報が含まれる。上述したように、ビームに関する情報には、少なくともビーム設定情報が含まれる。基地局20は、フロントホールリンクを使って、中継装置30に対して、PDCCHを送信する。本実施形態の場合、フロントホールリンクは、基地局20と中継装置30との間のリンクである。PDCCHには、ビーム設定情報を含むDCIが含まれている。中継装置30は、基地局20から受信したPDCCHを復号してビーム設定情報を取得するとともに、このビーム設定情報に基づいてアクセスリンクのビームを制御する。
アクセスリンクの動的ビーム制御の概要を説明したが、以下、アクセスリンクの動的ビーム制御シーケンスを説明する。基地局20が中継装置30に送信するビーム設定情報には、下りアクセスリンクビームに関する情報、及び上りアクセスリンクビームに関する情報、の少なくとも一方の情報が含まれる。中継装置30は、ビーム設定情報に基づいて、下りアクセスリンク又は上りアクセスリンクの動的ビーム制御を行う。ここで、下りアクセスリンクとは、アクセスリンクの下りリンクのことであり、上りアクセスリンクとは、アクセスリンクの下りリンクのことである。
まず、下りアクセスリンクの動的ビーム制御シーケンスを説明する。図22は、下りアクセスリンクの動的ビーム制御シーケンスの一例を示す図である。
次に、上りアクセスリンクの動的ビーム制御シーケンスを説明する。図23は、下りアクセスリンクリンクの動的ビーム制御シーケンスの一例を示す図である。
次に、下りアクセスリンクの動的ビーム制御シーケンスの他の例を説明する。図24は、下りアクセスリンクの動的ビーム制御シーケンスの他の例を示す図である。
次に、上りアクセスリンクの動的ビーム制御シーケンスの他の例を説明する。図25は、下りアクセスリンクリンクの動的ビーム制御シーケンスの他の例を示す図である。
次に、スマートリピータ用のDCIについて説明する。スマートリピータ用のDCIは、(1)端末装置固有DCI(UE-specific DCI)、(2)端末グループ共通DCI(UE-group common DCI)、などで定義される。
スマートリピータ用のDCIの一例として、端末装置固有DCI(スマートリピータ固有DCI)が挙げられる。端末装置固有DCIは、1つまたは複数のビームに関する情報を含み得る。
スマートリピータ用の端末装置固有DCIの一例として、下りリンクアサインメントDCIが想定されうる。具体的には、端末装置固有DCIとして、DCIフォーマット1_0、DCIフォーマット1_1、または、DCIフォーマット1_2を使用することが想定されうる。なお、端末装置固有DCIとして、DCIフォーマット1_0、DCIフォーマット1_1、または、DCIフォーマット1_2と同じビット数のDCIが使用さられてもよい。また、端末装置固有DCIとして、新しいDCIフォーマット(例えば、DCIフォーマット1_3)が使用されてもよい。
スマートリピータ用の端末装置固有DCIの一例として、上りリンクグラントDCI用が想定されうる。具体的には、端末装置固有DCIとして、DCIフォーマット0_0、DCIフォーマット0_1、または、DCIフォーマット0_2を使用することが想定されうる。なお、端末装置固有DCIとして、DCIフォーマット0_0、DCIフォーマット0_1、または、DCIフォーマット0_2と同じビット数のDCIが使用されてもよい。また、端末装置固有DCIとして、新しいDCIフォーマット(例えば、DCIフォーマット0_3)が使用されてもよい。
スマートリピータ用のDCIの一例として、端末装置グループ共通DCI(スマートリピータグループ共通DCI)が挙げられる。端末装置グループ共通DCIは、1つまたは複数のスマートリピータに対する1つまたは複数のビームに関する情報を含み得る。
スマートリピータ用のDCIの一例として、サイドリンクDCI(例えば、DCIフォーマット3_x(xは任意の整数))が想定される。サイドリンクDCIは、基地局20と中継装置30と間のリンクがサイドリンクとして定義される場合に用いられる。本サイドリンクDCIは、少なくとも中継装置30と端末装置40間のリンクのビーム設定情報を含む。
スマートリピータ用のDCIの一例として、スマートリピータ専用DCI(例えば、DCIフォーマット4_x(xは任意の整数))が想定される。スマートリピータ専用DCIは、基地局20と中継装置30と間のリンク(フロントホールリンク)に用いられる。スマートリピータ専用DCIは、少なくともアクセスリンクのビーム設定情報を含む。
ビームに関する情報は、以下の情報として定義される。なお、ビームに関する情報には中継装置30のアクセスリンクのビーム設定情報が含まれる。中継装置30は、DCIに含まれるこのビーム設定情報に基づいて、アクセスリンクのビームを決定する。
まず、下りアクセスリンクのビームに関する情報の例を列挙する。なお、本実施形態では、下りアクセスリンクのビームは、中継装置30の端末装置40に対する送信ビームのことである。下りアクセスリンクのビームに関する情報としては、以下の(1-1)~(1-6)が想定されうる。
中継装置30の送信ビームの情報は、空間送信特性(Spatial Transmitter characteristic)として定義される。この空間送信特性に対応するインデックスが指定されることで、基地局20は、中継装置30の下りアクセスリンクのビームを指示することができる。中継装置30は、この空間送信特性に関する情報に基づき、下りアクセスリンクのビームを決定する。
中継装置30の送信ビームの情報は、TCI(Transmission Configuration Indication)として定義される。例えば、中継装置30の送信ビームの情報として、予め設定された中継装置30のSS/PBCHブロック、または、NZP CSI-RSリソースのCSI-RSポートのビームとのQCLの関係が設定される。TCI状態の指示によって、中継装置30は、アクセスリンクの送信ビームを決定する。
中継装置30の送信ビームの情報は、SS/PBCHブロックインデックスによって定義される。例えば、中継装置30は、基地局20から、予め設定された中継装置30のSS/PBCHブロックのインデックスを指示されることで、インデックスに対応するSS/PBCHブロックと同じ(QCL関係にある)ビームを、アクセスリンクの送信ビームとして用いる。
中継装置30の送信ビームの情報は、NZP CSI-RSリソースIDによって定義される。例えば、中継装置30は、予め設定されたNZP CSI-RSリソースIDを基地局20から指示されることで、IDに対応するNZP CSI-RSリソースのCSI-RSポートと同じ(QCL関係にある)ビームを、アクセスリンクの送信ビームとして用いる。
中継装置30の送信ビームの情報は、下りリンク参照信号のアンテナポートによって定義される。下りリンク参照信号のアンテナポートにおいて、CSI-RSは3000番から定義され、SS/PBCHブロックは4000番から定義される。例えば、予め設定された中継装置30のSS/PBCHブロックまたはNZP CSI-RSのアンテナポート番号、または、アンテナポート番号に紐づいたインデックスを基地局20から指示されることで、中継装置30は、アンテナポートに対応するSS/PBCHブロックまたはNZP CSI-RSと同じ(QCL関係にある)ビームを、アクセスリンクの送信ビームとして用いる。
中継装置30の送信ビームの情報は、端末装置40を指定する情報(以下、端末指定情報という。)として定義される。基地局20は、端末指定情報を、中継装置30に対して通知する。中継装置30は、受信した端末指定情報に基づいて、適切な送信ビームを設定する。適切な送信ビームは、予め設定されてもよいし、中継装置30によって推定されてもよいし、基地局20によって指定されてもよい。端末指定情報は、例えば、C-RNTI、などが挙げられる。
次に、上りアクセスリンクのビームに関する情報の例を列挙する。なお、本実施形態では、上りアクセスリンクのビームは、中継装置30の端末装置40に対する受信ビームのことである。下りアクセスリンクのビームに関する情報としては、以下の(2-1)~(2-3)が想定されうる。
中継装置30の受信ビームの情報は、空間受信特性(Spatial Receiver characteristic)として定義される。この空間受信特性に対応するインデックスが指定されることで、中継装置30の上りアクセスリンクのビームを指示することができる。中継装置30は、この空間受信特性に関する情報に基づき、上りアクセスリンクのビームを決定する。
中継装置30の受信ビームの情報は、SRIによって定義される。例えば、端末装置40のSRSのインデックスを基地局20から指示されることで、中継装置30は、インデックスに対応するSRSと同じ(QCL関係にある)ビームを、アクセスリンクの受信ビームとして用いる。
中継装置30の受信ビームの情報は、端末装置40を指定する情報として定義される。基地局20は、端末装置40を指定する情報を、中継装置30に対して通知する。中継装置30は、受信した端末装置40を指定する情報に基づいて、適切な受信ビームを設定する。適切な受信ビームは、予め設定されてもよいし、中継装置30によって推定されてもよいし、基地局20によって指定されてもよい。端末装置40を指定する情報は、例えば、C-RNTI、などが挙げられる。
DCIによって指定されたビームは、設定の適用期間が設けられてもよい。中継装置30は、DCIによって指定されたビーム設定(送信ビーム設定および/または受信ビーム設定)を、この適用期間で適用する。それ以外の適用期間では、中継装置30は、DCIによって指定されたビーム設定を適用しない。このビーム設定の適用に関する制御は、例えば、中継装置30の通信制御部333により実行される。これにより、基地局20によるアクセスリンクのビーム管理が容易になるので、無線通信のさらなる効率的な運用が可能になる。
基地局20は、DCIの情報によってビーム設定の適用期間を指定する。DCIには、明示的または暗示的にビーム設定の適用期間を指定する情報(以下、ビーム設定の適用期間を示す情報ともいう。)が含まれる。中継装置30の特定部332は、DCIに含まれる情報に基づいて、ビーム設定の適用期間を特定する。中継装置30の通信制御部333は、特定した期間のみに、基地局20から指定された送信ビームおよび/または受信ビームを適用する。
DCIに含まれるビーム設定の適用期間を示す情報の例として、1つまたは複数の連続したスロットおよび/またはシンボルを指定する情報が想起される。DCIには、連続したスロットおよび/またはシンボルを示す情報が含まれる。連続したスロットおよび/またはシンボルを示す情報が示す区間では、中継装置30は基地局20から指定された送信ビームおよび/または受信ビームを適用する。それ以外の期間では、中継装置30は、基地局20から指定されたビームを適用しない。
DCIによるビーム設定の適用期間を示す情報の他の例として、転送する制御情報およびデータを含んだ物理チャネルが割り当てられた期間の情報が想起される。
DCIによるビーム設定の適用期間を示す情報は、アクセスリンクへ転送するPDCCHおよびPDSCHが割り当てられた期間、および、PDSCHに対応するHARQ-ACKを含むPUCCHまたはPUSCHが割り当てられた期間の情報であってもよい。中継装置30用のDCIには、転送するPDCCHの送信期間、および、転送するPDSCHの送信期間の情報が含まれる。転送するPDCCHの送信期間の情報は、例えば、転送するPDCCHが送られるスロットおよび転送するPDCCHが置かれるCORESETの情報(CORESETのシンボル数)である。転送するPDSCHの送信期間の情報は、例えば、PDSCHのTDRA(time domain resource allocation)の情報である。TDRAの情報は、開始のシンボルおよびシンボル長の組み合わせを示す情報であるSLIV(Start and length Indicator Value)によって表現される。
(A2)PDSCHに対応するビーム設定情報
(A3)HARQ-ACKを含むPUCCHに対応するビーム設定情報
(A4)CORESETのリソース情報
(A5)PDSCHのスケジューリング情報
(A6)PUCCHのリソース情報
(B2)スロット#1にスケジュールされた端末装置40宛のPDSCHの期間
(B3)スロット#2にスケジュールされたHARQ-ACKを含むPUCCHの期間
DCIによるビーム設定の適用期間を示す情報は、アクセスリンクへ転送するPDCCHが割り当てられた期間、および、PUSCHが割り当てられた期間の情報であってもよい。スマートリピータ用のDCIには、転送するPDCCHの送信期間、および、転送するPUSCHの受信期間の情報が含まれる。転送するPDCCHの送信期間は、例えば、転送するPDCCHが送られるスロットおよび転送するPDCCHが置かれるCORESETの情報(CORESETのシンボル数)である。転送するPUSCHの受信期間は、例えば、PUSCHのTDRA(time domain resource allocation)の情報である。
(C2)PUSCHに対応するビーム設定情報
(C3)CORESETのリソース情報
(C4)PUSCHのスケジューリング情報
(D2)スロット#2にスケジュールされた端末装置40のPUSCHの期間
DCIの送信タイミングおよび他のパラメータによっても、ビーム設定適用期間が指定されうる。中継装置30の特定部332は、DCIの送信タイミングおよび他のパラメータに基づいて、ビーム設定の適用期間を特定する。中継装置30の通信制御部333は、特定した期間のみに、DCIによって指定された送信ビームおよび/または受信ビームを適用する。中継装置30は、それ以外の期間では、DCIによって指定された送信ビームおよび/または受信ビームを適用しない。
DCIの送信タイミングおよびタイマーによって、ビーム設定の適用期間が指定される。中継装置30は、タイマーを、ビーム設定情報を含んだDCIを受信してから開始する。又は、中継装置30は、タイマーを、ビーム設定情報を含んだDCIを受信後、所定のオフセット期間経過後から開始する。所定のオフセット期間は0であってもよい。中継装置30は、タイマーの開始からタイマーが満了するまでの期間、DCIによって指定されたビームを適用する。一方、中継装置30は、タイマー満了後は、DCIによって指定されたビームを適用しない。
DCIの送信タイミングおよび所定のタイミングによって、ビーム設定の適用期間が指定される。中継装置30は、ビーム設定情報を含んだDCIを受信してから、予め定められた所定のタイミングまでの期間、DCIによって指定されたビームを適用する。又は、中継装置30は、ビーム設定情報を含んだDCIを受信して所定のオフセット期間経過した後から、予め定められた所定のタイミングまでの期間、DCIによって指定されたビームを適用する。所定のオフセット期間は0であってもよい。一方、それ以外の期間では、中継装置30は、DCIによって指定されたビームを適用しない。
中継装置30は、ビーム設定情報を含んだDCIを受信して所定のオフセット期間経過後から、次のビーム情報を含んだDCI受信してから所定のオフセット期間経過後までの期間、先に受信したDCIによって指定されたビームを適用する。すなわち、次のビーム情報を含んだDCIを受信するまで、先に受信したDCIによって指定されたビームが適用し続けられる。
中継装置30は、ビーム設定情報を含んだDCIを受信して所定のオフセット期間経過後から、次のビーム設定情報を含んだDCIに対するPDCCHモニタリングオケージョンまでの期間、先に受信したDCIによって指定されたビームを適用する。すなわち、次のビーム設定情報を受信するか否かに関わらず、次のPDCCHモニタリングオケージョンまで、先に受信したDCIによって指定されたビームが適用し続けられる。
中継装置30は、ビーム設定情報を含んだDCIを受信してから所定のオフセット期間後から、固定のタイミングまでの期間、DCIによって指定されたビームを適用する。固定のタイミングは、例えば、無線フレーム境界、ハーフフレーム境界、サブフレーム境界、スロット境界、などが挙げられる。固定のタイミング後は、DCIによって指定されたビームは適用されない。
フロントホールリンクにおける下りリンク物理信号/物理チャネルの受信タイミングとアクセスリンクにおける下りリンク物理信号/物理チャネルの送信タイミング、は独立に指定されてもよい。また、フロントホールリンクにおける上りリンク物理信号/物理チャネルの送信タイミングとアクセスリンクにおける上りリンク物理信号/物理チャネルの受信タイミングも独立に指定されてもよい。この場合、中継装置30は、受信した下りリンク物理信号/物理チャネルおよび上りリンク物理信号/物理チャネルを送信タイミングまで保持するバッファを備える。
一例として、フロントホールリンクにおける下りリンク物理信号/物理チャネルの受信タイミングは、ビーム設定情報を含むDCIによって指定されてもよい。例えば、フロントホールリンクにおける端末装置40宛のPDCCHおよび/またはPDSCHの受信スロットが、ビーム設定情報を含むDCIによって指定される。
一例として、フロントホールリンクにおける下りリンク物理信号/物理チャネルの送信タイミングは、ビーム設定情報を含むDCIによって指定されてもよい。例えば、アクセスリンクにおけるPDCCHの送信スロットが、ビーム設定情報を含むDCIによって指定されてもよい。
一例として、フロントホールリンクにおける上りリンク物理信号/物理チャネルの送信タイミングは、ビーム設定情報を含むDCIによって指定されてもよい。例えば、フロントホールリンクにおけるPUSCHの送信スロットが、ビーム設定情報を含むDCIによって指定されてもよい。
一例として、フロントホールリンクにおける上りリンク物理信号/物理チャネルの受信タイミングは、ビーム設定情報を含むDCIによって指定されてもよい。例えば、アクセスリンクにおけるPUSCHの受信スロットが、ビーム設定情報を含むDCIによって指定されてもよい。
フロントホールリンクにおいて、複数の端末装置40からの上りリンク物理信号/物理チャネルが同タイミングで送信を要求された場合、上りリンクリソースの衝突や送信電力の制限によって、全ての上りリンク物理信号/物理チャネルを送信することが困難となる。その場合において、高優先度の上りリンク物理信号/物理チャネルが送信される。なお、低優先度の上りリンク物理信号/物理チャネルは送信されなくてもよいし、低送信電力で送信されてもよいし、他の上りリンク送信機会で送信されてもよい。
ビーム設定情報を含むDCIを受信するためのBWP(例えば、BWP#0)と、端末装置40に転送するためのBWP(例えば、BWP#1)は、異なることが望ましい。具体的には、BWP#0は、BWP#1よりも帯域が狭いことが望ましい。この場合、ビーム設定情報を含むDCIはBWPを切り替えるための情報(bandwidth part indicator)を含む。これにより、ビーム設定情報を含むDCIのPDCCHモニタリングに掛かる消費電力を抑えることができる。
更に、基地局20は、アクセスリンクのビーム制御に加え、下りアクセスリンクの送信電力を制御することができる。これは、ビーム設定情報を含むDCIによって、基地局20が中継装置30を制御することにより行われてもよい。例えば、基地局20は、ビーム設定情報を含むDCIに含まれる下りリンク送信電力に関する情報によって、中継装置30に対し、後に送られる端末装置40宛のPDCCHおよびPDSCHの送信電力を指定する。
次に、実施形態2の通信システム1について説明する。
実施形態1では、中継装置30のアクセスリンクのビームは動的に制御されたが、実施形態2では準静的に制御される。例えば、基地局20は、RRCシグナリング(SIB(System Information Block)または専用RRCシグナリング)、MAC CE、および/または、DCIで、中継装置30に対し、ビームパターン情報を設定する。中継装置30は、設定されたビームパターン情報に基づいて、中継装置30のアクセスリンクのビームを制御する。ここで、ビームパターンは、時間軸に並ぶ複数のビームで構成され、ビームパターン情報は、この複数のビームに関する情報のセットである。なお、ビームに関する情報は、実施形態1で説明したビーム設定情報(ビーム制御情報)であってもよい。この場合、ビームパターン情報は、複数のビーム設定情報で構成されていてもよい。基地局20は、フロントホールリンクで、中継装置30に対して、アクセスリンクのビームパターン情報を送信する。中継装置30は、このビームパターン情報に基づいて、アクセスリンクのビームを制御する。
ビームパターンが設定された場合、ビームパターン情報を構成するビーム設定情報は、時間リソースに紐づけられる。
以下では、上記の実施形態(実施形態1および実施形態2)に適用することができる機能や動作について説明する。
アクセスリンクのビーム設定として、デフォルト設定が用意されていてもよい。ここで、デフォルト設定とは、アクセスリンクのビーム制御のデフォルト動作の設定である。以下、アクセスリンクのビームのデフォルト動作について説明する。
中継装置30は、現在の状態が予め決められた状態となった場合には、デフォルト設定を適用する。例えば、以下の状態が1つ以上発生した場合、中継装置30はアクセスリンクのビーム設定をデフォルト設定とする。
中継装置30はビーム設定情報を含んだPDCCHまたはPDSCHの復号を失敗した場合に、デフォルト設定を適用する。(1)は、ビーム設定情報を含んだPDCCHまたはPDSCHが送られることを中継装置30が事前に知っている場合に適用されうる。中継装置30が事前に知っている場合の具体例として、他のPDCCHまたは他のPDSCHによって、PDCCHまたはPDSCHが送られることを事前に通知さている場合、周期によってオケージョンが定められている場合、が想起される。
中継装置30は、所定の期間または所定の回数ビーム設定情報を受信していない場合に、デフォルト設定を適用する。所定の期間は、例えば、スロットや無線フレーム、によって定められる。所定の回数は、例えば、PDCCHモニタリングオケージョン、によって定められる。所定の期間や所定の回数は、上位層によって設定されてもよい。
中継装置30は、ビーム設定適用に関するタイマー(例えば、ビーム設定タイマー、BWPインアクティブタイマー)が満了した場合、デフォルト設定を適用する。
中継装置30は、基地局20から指定されたリソースがビーム適用区間外のリソースである場合、デフォルト設定を適用する。
アクセスリンクのビーム制御のデフォルト動作として、例えば、以下の動作が想定されうる。
デフォルト動作として、アクセスリンクの送信および/または受信の停止が想定される。中継装置30は、デフォルト設定を適用した場合、アクセスリンクの送信を停止し、如何なる下りリンク物理信号/物理チャネルの転送を行わない。また、中継装置30は、デフォルト設定を適用した場合、アクセスリンクの受信を停止し、如何なる上りリンク物理信号/物理チャネルの転送を行わない。
中継装置30は、デフォルト動作として、前に設定されたビームを適用する動作を行ってもよい。すなわち、中継装置30は、デフォルト動作として、直前に適用されたアクセスリンクのビームを使い続ける動作を行ってもよい。
中継装置30は、デフォルト動作として、デフォルトのビームパターンとして予め設定されたビームパターンを適用する動作を行ってもよい。デフォルトのビームパターンは、中継装置30の設置時に設定されてもよいし、上位層で設定されてもよい。
受信機のみを備えるインテリジェントサーフェスにおいて、PDSCHがACK(またはNACK)である場合、HARQ-ACKタイミングで基地局20の方向に反射するビームを形成する。基地局20はそのタイミングでインテリジェントサーフェスに所定の信号を送信する。所定の信号に対する反射応答が受信された場合には、基地局20はインテリジェントサーフェスに対して送信したPDSCHがACK(またはNACK)であると判断する。所定の信号は、伝搬遅延時間よりも短い信号であることが好ましい。
上記の実施形態1および実施形態2におけるスマートリピータを端末装置40に置き換えることで、端末装置40間のサイドリンクにおけるビーム制御にも実施形態1および実施形態2は適用可能である。
上述の実施形態は一例を示したものであり、種々の変更及び応用が可能である。
以上説明したように、本開示の一実施形態によれば、中継装置30は、基地局20と端末装置40との間の通信をリレーする通信装置(例えば、スマートリピータ)である。中継装置30は、中継装置30と端末装置40との間の通信に用いられるビーム(すなわち、アクセスリンクのビーム)に関する情報を含んだ、中継装置30の物理層の制御に用いられる物理制御信号(DCI)を基地局20から受信する。中継装置30は、ビームに関する情報に基づいて、中継装置30と端末装置40との間の通信に用いられるビームを制御する。本実施形態の中継装置30を導入することで、基地局20と端末装置40との間の通信のリレーに関し、パフォーマンスが向上する。また、カバレッジが安価かつ容易に拡張できるので、無線通信の効率の良い運用が可能になる。
(1)
基地局と端末装置との間の通信をリレーする通信装置であって、
前記通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記基地局から受信する受信部と、
前記ビームに関する情報に基づいて、前記通信装置と前記端末装置との間の通信に用いられるビームを制御する通信制御部と、
を備える通信装置。
(2)
前記ビームに関する情報には、前記通信装置と前記端末装置との間のビーム設定に関する情報が含まれ、
前記ビーム設定に関する情報には、前記通信装置の前記端末装置へのビームである下りリンクビームに関する情報、及び前記端末装置の前記通信装置に対するビームである上りリンクビームに関する情報、の少なくとも一方の情報が含まれる、
前記(1)に記載の通信装置。
(3)
前記下りリンクビームに関する情報は、空間送信特性に関する情報、TCI(Transmission Configuration Indication)、SS/PBCHブロックインデックス、NZP CSI-RSリソースID、下りリンク参照信号のアンテナポート、及び端末装置を指定する情報のうち少なくとも1つである、
前記(2)に記載の通信装置。
(4)
前記上りリンクビームに関する情報は、空間受信特性に関する情報、SRI(SRS resource indicator)、又は端末装置を指定する情報である、
前記(2)又は(3)に記載の通信装置。
(5)
前記ビームに関する情報には、前記ビーム設定の適用期間を示す情報が含まれ、
前記通信制御部は、前記ビーム設定の適用期間を示す情報に基づき特定される期間、前記ビーム設定に基づく制御を行う、
前記(2)~(4)のいずれか1項に記載の通信装置。
(6)
前記ビーム設定の適用期間を示す情報には、前記ビーム設定の適用期間として、1又は複数の連続したスロット、及び、1又は複数の連続したシンボル、の少なくとも一方を指定する情報が含まれる、
前記(5)に記載の通信装置。
(7)
前記ビーム設定の適用期間を示す情報には、前記ビーム設定の適用期間として、前記基地局又は前記端末装置への転送情報を含んだ物理チャネルが割り当てられた期間を指定する情報が含まれる、
前記(5)に記載の通信装置。
(8)
前記ビーム設定の適用期間を示す情報には、前記通信装置と前記端末装置との間のリンクであるアクセスリンクへ転送するPDCCHおよびPDSCHが割り当てられた期間、および、PDSCHに対応するHARQ-ACKを含むPUCCHまたはPUSCHが割り当てられた期間、の少なくとも一方の期間の情報が含まれる、
前記(7)に記載の通信装置。
(9)
前記ビーム設定の適用期間を示す情報には、アクセスリンクへ転送するPDCCHが割り当てられた期間、および、PUSCHが割り当てられた期間、の少なくとも一方の期間の情報が含まれる、
前記(7)に記載の通信装置。
(10)
前記物理制御信号の送信タイミングおよびパラメータの少なくとも一方に基づいて、前記ビーム設定の適用期間を特定する特定部、を備え、
前記通信制御部は、前記特定部で特定された期間、前記ビーム設定に基づく制御を行う、
前記(2)~(4)のいずれか1項に記載の通信装置。
(11)
前記特定部は、タイマーに基づいて前記ビーム設定の適用期間を特定する、
前記(10)に記載の通信装置。
(12)
前記特定部は、前記物理制御信号の送信タイミングに基づいて前記ビーム設定の適用期間を特定する、
前記(10)に記載の通信装置。
(13)
前記特定部は、前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後から、次の前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後まで、の期間を該ビーム設定の適用期間として特定する、
前記(12)に記載の通信装置。
(14)
前記特定部は、前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後から、次の前記ビーム設定に関する情報を含んだ前記物理制御信号に対するPDCCHモニタリングオケージョンまで、の期間を該ビーム設定の適用期間として特定する、
前記(12)に記載の通信装置。
(15)
前記特定部は、前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後から、固定のタイミングまで、の期間を該ビーム設定の適用期間として特定する、
前記(12)に記載の通信装置。
(16)
前記受信部は、リレータイミングの指定に関する情報を受信し、
前記通信制御部は、前記リレータイミングの指定に関する情報に基づき特定されるタイミングで情報をリレーする、
前記(1)~(15)のいずれか1項に記載の通信装置。
(17)
前記通信制御部は、複数の前記端末装置から前記基地局へ同タイミングで情報の送信を要求された場合には、所定の基準に従い、複数の前記端末装置のいずれかの情報を他の前記端末装置の情報に優先して送信する、
前記(1)~(16)のいずれか1項に記載の通信装置。
(18)
前記ビームに関する情報を含む前記物理制御信号を受信するためのBWPと、端末装置に転送するためのBWPは、異なり、
前記ビームに関する情報を含む前記物理制御信号には、前記BWPを切り替えるための情報が含まれ、
前記通信制御部は、前記BWPを切り替えるための情報に基づいて前記BWPを切り替える、
前記(1)~(17)のいずれか1項に記載の通信装置。
(19)
前記ビームに関する情報を含む前記物理制御信号には、下りリンクの送信電力に関する情報が含まれ、
前記通信制御部は、前記下りリンクの送信電力に関する情報に基づいて、前記下りリンクの送信電力を制御する、
前記(1)~(18)のいずれか1項に記載の通信装置。
(20)
基地局と端末装置との間の通信をリレーする通信装置が実行する通信方法であって、
前記通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記基地局から受信し、
前記ビームに関する情報に基づいて、前記通信装置と前記端末装置との間の通信に用いられるビームを制御する、
通信方法。
(21)
基地局であって、
送信部と、
制御部とを有し、
前記制御部は、前記送信部を介して、
前記基地局と端末装置との間の通信をリレーする通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記通信装置へ送信し、及び
前記端末装置との間の通信を、前記通信装置を介して行うよう構成され、
前記端末装置との間の通信のうち、前記通信装置と前記端末装置との間の通信に用いられるビームは、前記ビームに関する情報に基づいて制御される、
基地局。
(22)
基地局の方法であって、
前記基地局と端末装置との間の通信をリレーする通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記通信装置へ送信し、及び
前記端末装置との間の通信を、前記通信装置を介して行い、
前記端末装置との間の通信のうち、前記通信装置と前記端末装置との間の通信に用いられるビームは、前記ビームに関する情報に基づいて制御される、
基地局の方法。
10 管理装置
20 基地局
30 中継装置
40 端末装置
11 通信部
21、31、41 無線通信部
12、22、32、42 記憶部
13、23、33、43 制御部
211、311、411 送信処理部
212、312、412 受信処理部
213、313、413 アンテナ
331 受信部
332 特定部
333 通信制御部
Claims (20)
- 基地局と端末装置との間の通信をリレーする通信装置であって、
前記通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記基地局から受信する受信部と、
前記ビームに関する情報に基づいて、前記通信装置と前記端末装置との間の通信に用いられるビームを制御する通信制御部と、
を備える通信装置。 - 前記ビームに関する情報には、前記通信装置と前記端末装置との間のビーム設定に関する情報が含まれ、
前記ビーム設定に関する情報には、前記通信装置の前記端末装置へのビームである下りリンクビームに関する情報、及び前記端末装置の前記通信装置に対するビームである上りリンクビームに関する情報、の少なくとも一方の情報が含まれる、
請求項1に記載の通信装置。 - 前記下りリンクビームに関する情報は、空間送信特性に関する情報、TCI(Transmission Configuration Indication)、SS/PBCHブロックインデックス、NZP CSI-RSリソースID、下りリンク参照信号のアンテナポート、及び端末装置を指定する情報のうち少なくとも1つである、
請求項2に記載の通信装置。 - 前記上りリンクビームに関する情報は、空間受信特性に関する情報、SRI(SRS resource indicator)、又は端末装置を指定する情報である、
請求項2に記載の通信装置。 - 前記ビームに関する情報には、前記ビーム設定の適用期間を示す情報が含まれ、
前記通信制御部は、前記ビーム設定の適用期間を示す情報に基づき特定される期間、前記ビーム設定に基づく制御を行う、
請求項2に記載の通信装置。 - 前記ビーム設定の適用期間を示す情報には、前記ビーム設定の適用期間として、1又は複数の連続したスロット、及び、1又は複数の連続したシンボル、の少なくとも一方を指定する情報が含まれる、
請求項5に記載の通信装置。 - 前記ビーム設定の適用期間を示す情報には、前記ビーム設定の適用期間として、前記基地局又は前記端末装置への転送情報を含んだ物理チャネルが割り当てられた期間を指定する情報が含まれる、
請求項5に記載の通信装置。 - 前記ビーム設定の適用期間を示す情報には、前記通信装置と前記端末装置との間のリンクであるアクセスリンクへ転送するPDCCHおよびPDSCHが割り当てられた期間、および、PDSCHに対応するHARQ-ACKを含むPUCCHまたはPUSCHが割り当てられた期間、の少なくとも一方の期間の情報が含まれる、
請求項7に記載の通信装置。 - ビーム設定の適用期間を示す情報は、アクセスリンクへ転送するPDCCHが割り当てられた期間、および、PUSCHが割り当てられた期間、の少なくとも一方の期間の情報が含まれる、
請求項7に記載の通信装置。 - 前記物理制御信号の送信タイミングおよびパラメータの少なくとも一方に基づいて、前記ビーム設定の適用期間を特定する特定部、を備え、
前記通信制御部は、前記特定部で特定された期間、前記ビーム設定に基づく制御を行う、
請求項2に記載の通信装置。 - 前記特定部は、タイマーに基づいて前記ビーム設定の適用期間を特定する、
請求項10に記載の通信装置。 - 前記特定部は、前記物理制御信号の送信タイミングに基づいて前記ビーム設定の適用期間を特定する、
請求項10に記載の通信装置。 - 前記特定部は、前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後から、次の前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後まで、の期間を該ビーム設定の適用期間として特定する、
請求項12に記載の通信装置。 - 前記特定部は、前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後から、次の前記ビーム設定に関する情報を含んだ前記物理制御信号に対するPDCCHモニタリングオケージョンまで、の期間を該ビーム設定の適用期間として特定する、
請求項12に記載の通信装置。 - 前記特定部は、前記ビーム設定に関する情報を含んだ前記物理制御信号を受信した後又は受信して所定のオフセット期間経過後から、固定のタイミングまで、の期間を該ビーム設定の適用期間として特定する、
請求項12に記載の通信装置。 - 前記受信部は、リレータイミングの指定に関する情報を受信し、
前記通信制御部は、前記リレータイミングの指定に関する情報に基づき特定されるタイミングで情報をリレーする、
請求項1に記載の通信装置。 - 前記ビームに関する情報を含む前記物理制御信号には、下りリンクの送信電力に関する情報が含まれ、
前記通信制御部は、前記下りリンクの送信電力に関する情報に基づいて、前記下りリンクの送信電力を制御する、
請求項1に記載の通信装置。 - 基地局と端末装置との間の通信をリレーする通信装置が実行する通信方法であって、
前記通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記基地局から受信し、
前記ビームに関する情報に基づいて、前記通信装置と前記端末装置との間の通信に用いられるビームを制御する、
通信方法。 - 基地局であって、
送信部と、
制御部とを有し、
前記制御部は、前記送信部を介して、
前記基地局と端末装置との間の通信をリレーする通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記通信装置へ送信し、及び
前記端末装置との間の通信を、前記通信装置を介して行うよう構成され、
前記端末装置との間の通信のうち、前記通信装置と前記端末装置との間の通信に用いられるビームは、前記ビームに関する情報に基づいて制御される、
基地局。 - 基地局の方法であって、
前記基地局と端末装置との間の通信をリレーする通信装置の物理層の制御に用いられる物理制御信号であって前記通信装置と前記端末装置との間の通信に用いられるビームに関する情報を含む前記物理制御信号を、前記通信装置へ送信し、及び
前記端末装置との間の通信を、前記通信装置を介して行い、
前記端末装置との間の通信のうち、前記通信装置と前記端末装置との間の通信に用いられるビームは、前記ビームに関する情報に基づいて制御される、
基地局の方法。
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US20220103247A1 (en) * | 2020-09-30 | 2022-03-31 | Qualcomm Incorporated | Programmable smart repeater with in-band control |
US11962398B2 (en) * | 2020-09-30 | 2024-04-16 | Qualcomm Incorporated | Programmable smart repeater with in-band control |
US20230051415A1 (en) * | 2021-08-12 | 2023-02-16 | Qualcomm Incorporated | Bandwidth part switching in repeaters |
WO2023032417A1 (ja) * | 2021-09-02 | 2023-03-09 | 株式会社Kddi総合研究所 | 基地局装置、リピータ装置、および無線通信システム、ならびにこれらの制御方法およびプログラム |
WO2023135822A1 (ja) * | 2022-01-17 | 2023-07-20 | 株式会社Nttドコモ | 無線中継装置及び通信方法 |
WO2023170926A1 (ja) * | 2022-03-11 | 2023-09-14 | 株式会社Nttドコモ | リピーター、基地局、及び通信方法 |
WO2023239588A1 (en) * | 2022-06-06 | 2023-12-14 | Qualcomm Incorporated | Quasi co-location type for spatially correlated synchronization signal block beams |
WO2023236021A1 (zh) * | 2022-06-06 | 2023-12-14 | 富士通株式会社 | 一种通信方法、装置和系统 |
WO2023241494A1 (zh) * | 2022-06-15 | 2023-12-21 | 维沃移动通信有限公司 | 通信设备的状态控制方法、通信设备及网络侧设备 |
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WO2024018849A1 (en) * | 2022-07-22 | 2024-01-25 | Sharp Kabushiki Kaisha | User equipments, base stations and methods for beam indication of network-controlled repeater |
WO2024028780A1 (en) * | 2022-08-01 | 2024-02-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Selection of spatial filters in repeater-assisted networks |
WO2024067963A1 (en) * | 2022-09-28 | 2024-04-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Control of a reflective intelligent surface |
WO2024065813A1 (zh) * | 2022-09-30 | 2024-04-04 | 北京小米移动软件有限公司 | 波束应用方法、装置、存储介质及芯片 |
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