WO2021024611A1 - Système de communication sans fil, réflecteur à commande de phase et procédé de communication sans fil - Google Patents

Système de communication sans fil, réflecteur à commande de phase et procédé de communication sans fil Download PDF

Info

Publication number
WO2021024611A1
WO2021024611A1 PCT/JP2020/022867 JP2020022867W WO2021024611A1 WO 2021024611 A1 WO2021024611 A1 WO 2021024611A1 JP 2020022867 W JP2020022867 W JP 2020022867W WO 2021024611 A1 WO2021024611 A1 WO 2021024611A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase control
control reflector
base station
phase
radio
Prior art date
Application number
PCT/JP2020/022867
Other languages
English (en)
Japanese (ja)
Inventor
雄太 ▲高▼橋
阿部　順一
Original Assignee
株式会社Ｎｔｔドコモ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Publication of WO2021024611A1 publication Critical patent/WO2021024611A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/44—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
    • H01Q3/46—Active lenses or reflecting arrays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters

Definitions

  • the present invention relates to a wireless communication system, a phase control reflector and a wireless communication method, and more particularly to a phase control of a wireless signal.
  • LTE Long Term Evolution
  • NR New Radio
  • NG Next Generation
  • 3GPP has a small cell (small cell) using a high frequency band exceeding 52.6 GHz and a large scale (massive) having a large number of antenna elements.
  • Massive MIMO Multiple-Input Multiple-Output
  • Non-Patent Document 1 a method of improving MIMO performance in a multipath environment using a passive repeater has been tried.
  • Non-Patent Document 1 When the high frequency band as described above is used and the carrier frequency is high, an increase in phase noise becomes a problem. When a passive repeater as described in Non-Patent Document 1 is used, a certain effect can be expected for eliminating dead zones.
  • phase of the radio signal received by the terminal (User Equipment, UE) via the repeater may have rotated significantly from the reference value, and may not always be optimal.
  • PTRS Phase Tracking RS is specified in order to deal with such phase noise, but appropriate processing on the terminal side is required.
  • the present invention has been made in view of such a situation, and when a high frequency band is used, a wireless communication system, a phase control reflector, and a phase control reflector that can greatly reduce phase noise while eliminating dead zones.
  • the purpose is to provide a wireless communication method.
  • a radio communication system including a phase control reflector (phase control reflector 300) that reflects a radio signal from a radio base station (for example, radio base station 150A) or a terminal (UE200).
  • the first propagation channel information acquisition unit (H PT acquisition unit 310) for acquiring the first propagation channel information (H PT ) between the radio base station and the phase control reflector, and the phase control reflector.
  • a second propagation channel information acquisition unit (H RP acquisition unit 320) for acquiring the second propagation channel information (H RP ) with the terminal, and the phase control reflector is the first propagation channel information.
  • the phase of the radio signal reflected toward the terminal or the radio base station is controlled based on (H PT ) and the second propagation channel information (H RP ).
  • phase control reflector 300 that reflects a radio signal from a radio base station (eg, radio base station 150A) or terminal (UE200), wherein the radio base station and the above. Based on the first propagation channel information ( HPT ) between the phase control reflector and the second propagation channel information (H RP ) between the phase control reflector and the terminal, the terminal or the radio base station. The phase of the radio signal reflected toward is controlled.
  • HPT first propagation channel information
  • H RP second propagation channel information
  • One aspect of the present disclosure is a step of estimating the first propagation channel information between the radio base station and the phase control reflector, and a step of estimating the second propagation channel information between the phase control reflector and the terminal. And the step of controlling the phase of the radio signal reflected by the phase control reflector toward the terminal or the radio base station based on the first propagation channel information and the second propagation channel information. The method.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
  • FIG. 2 is a basic configuration diagram of a network using the phase control reflector 300.
  • FIG. 3 is a functional block configuration diagram of the phase control reflector 300.
  • FIG. 4A is a diagram showing an example of forming an antenna beam by a conventional radio base station.
  • FIG. 4B is a diagram showing an example of forming an antenna beam by a radio base station corresponding to Massive MIMO.
  • FIG. 5 is an explanatory diagram of a typical problem when a high frequency band is used.
  • FIG. 6 is a diagram showing a phase optimization operation flow of a radio signal using a phase control reflector.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
  • FIG. 2 is a basic configuration diagram of a network using the phase control reflector 300.
  • FIG. 3 is a functional block configuration diagram of the phase control reflector 300.
  • FIG. 4A is a diagram showing an example of forming an antenna beam by a
  • FIG. 7 is a diagram showing an estimation example of propagation channel information (H PT , H RP ) according to the first embodiment.
  • FIG. 8 is a diagram showing an estimation example of propagation channel information ( HPT , HRP ) according to the second embodiment.
  • FIG. 9 is a diagram showing an estimation example of propagation channel information (H PT , H RP ) according to the third embodiment.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the UE 200 and the phase control reflector 300.
  • FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment.
  • the wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and is composed of a plurality of radio base stations and a plurality of terminals.
  • NR 5G New Radio
  • the wireless communication system 10 includes a wireless base station 100, a wireless base station 150A to a wireless base station 150D, and a user terminal 200 (hereinafter, UE200, User Equipment).
  • UE200 User Equipment
  • Radio base station 100 is a radio base station according to 5G and forms cell C1. Note that cell C1 is a relatively large cell and is called a macro cell.
  • Radio base stations 150A to 150D are also radio base stations according to 5G, but they form cells C11 to C14, which are relatively small in size, respectively.
  • Cell C11 to cell C14 may be referred to as a small cell, a semi-macro cell, or the like. As shown in FIG. 1, cells C11 to C14 may be formed so as to be included (overlaid) in cell C1 (macro cell).
  • a macro cell is generally interpreted as a communicable area with a radius of several hundred meters to several tens of kilometers covered by one radio base station.
  • a small cell is interpreted as a general term for cells that have a small transmission power and cover a small area as compared with a macro cell.
  • the radio base station 100 and the radio base station 150A to the radio base station 150D may be described as gNodeB (gNB) or BS.
  • gNB gNodeB
  • UE200 may be described as MS or the like.
  • the specific configuration of the wireless communication system 10 including the number of wireless base stations and terminals is not limited to the example shown in FIG.
  • the wireless communication system 10 is not necessarily limited to the wireless communication system according to 5G.
  • the wireless communication system 10 may be a 5G next-generation wireless communication system (may be called Beyond 5G or the like) or a wireless communication system according to Long Term Evolution (LTE).
  • 5G next-generation wireless communication system may be called Beyond 5G or the like
  • LTE Long Term Evolution
  • Radio base station 100 and radio base station 150A to radio base station 150D execute wireless communication according to UE200 and 5G.
  • Radio base station 100 and radio base station 150A to radio base station 150D and UE200 are Massive MIMO, multiple components that generate more directional beam BM by controlling radio signals transmitted from multiple antenna elements. It can support carrier aggregation (CA), which uses carriers (CC) in a bundle, and dual connectivity (DC), which communicates simultaneously between the UE and each of the two NG-RAN Nodes.
  • CA carrier aggregation
  • CC carriers
  • DC dual connectivity
  • the wireless communication system 10 can also support a high frequency band higher than the following frequency range (FR) specified in 3GPP Release 15.
  • FR frequency range
  • FR1 410 MHz to 7.125 GHz
  • FR2 24.25 GHz to 52.6 GHz
  • FR4 belongs to the so-called EHF (extremely high frequency, also called millimeter wave).
  • EHF extreme high frequency, also called millimeter wave
  • FR4 is a tentative name and may be called by another name.
  • the wireless communication system 10 includes a phase control reflector 300.
  • the phase control reflector 300 reflects (may be called a relay or the like) a radio signal transmitted from a radio base station (for example, radio base station 150A).
  • the UE 200 can receive the radio signal reflected by the phase control reflector 300.
  • the phase control reflector 300 reflects the radio signal transmitted to the UE 200. That is, the phase control reflector 300 reflects the radio signal from the radio base station or terminal.
  • the phase control reflector 300 can change the phase of the radio signal reflected toward the UE 200. From this point of view, the phase control reflector 300 may be referred to as a phase variable reflector. As will be described later, the phase control reflector 300 has a function of changing the phase of the radio signal and relaying the signal, and the name of the reflector does not necessarily have to be used. For example, it may be called a repeater, a repeater, a reflect array, a transmit array, or the like.
  • FIG. 2 is a basic configuration diagram of a network using the phase control reflector 300.
  • the phase control reflector 300 is interposed between the radio base station 150A (may be another radio base station) and the UE 200, and the radio transmitted / received between the radio base stations 150A and the UE 200. Reflects (relays) the signal.
  • the radio base stations 150A and UE200 directly transmit and receive radio signals without going through the phase control reflector 300.
  • the UE 200 When the UE 200 detects the deterioration of the radio quality, it transmits a reference signal (RS) to the phase control reflector 300.
  • RS reference signal
  • Phase control reflector 300 based on the propagation channel information between the radio base stations 150A ⁇ phase control reflector 300 (H PT), the propagation channel information between the UE 200 ⁇ phase control reflector 300 (H RP), the radio base station 150A Controls the phase of the radio signal transmitted by and reflected towards the UE200.
  • the phase control reflector 300 based on the H PT and H RP, sent by the UE 200, and controls the phase of the radio signal reflected toward the radio base station 150A.
  • the propagation channel is an individual communication path for wireless communication, and here, it is a communication path between each transmission / reception antenna (BS ant. And MS ant. In the figure).
  • the phase control reflector 300 includes a compact multi-element antenna 301 compatible with Massive MIMO, a phase shifter 303 that changes the phase of a radio signal, substantially a radio wave, to a specific phase, and uses the phase shifter 303.
  • UE200 or radio base station 150A controls the phase of the radio waves reflected (relayed). The specific method of controlling the phase by the phase control reflector 300 will be described later.
  • FIG. 3 is a functional block configuration diagram of the phase control reflector 300.
  • the phase control reflector 300 includes an HPT acquisition unit 310, an H RP acquisition unit 320, a phase control unit 330, and a reflector unit 340.
  • the H PT acquisition unit 310 acquires the propagation channel information (H PT ) between the radio base station 150A (may be another radio base station, the same applies hereinafter) and the phase control reflector 300.
  • the HPT acquisition unit 310 constitutes a first propagation channel information acquisition unit that acquires the first propagation channel information.
  • the HPT acquisition unit 310 estimates the HPT based on the reference signal (RS) included in the radio signal transmitted from the radio base station 150A.
  • RS reference signal
  • CSI-RS Channel State Information-Reference Signal
  • other reference signals for example, Demodulation reference signal (DMRS)
  • DMRS Demodulation reference signal
  • the H PT acquisition unit 310 may directly estimate the H PT using the reference signal, or wirelessly (or or) estimate the HP PT estimated by another node (for example, the radio base station 150A) in the wireless communication system 10. It may be acquired via communication (which may be wired).
  • the H RP acquisition unit 320 acquires the propagation channel information (H RP ) between the phase control reflector 300 and the UE 200.
  • the H RP acquisition unit 320 constitutes a second propagation channel information acquisition unit that acquires the second propagation channel information.
  • the H RP acquisition unit 320 estimates the H RP based on the reference signal (RS) included in the radio signal transmitted from the UE 200.
  • RS reference signal
  • the reference signal like the H PT, or the like can be used DMRS or Sounding Reference Signal (SRS).
  • H PT and H RP can be expressed as follows.
  • M is the number of antennas of the terminal (reception)
  • N is the number of antennas of the wireless base station (transmission)
  • K is the number of reflectors.
  • the phase control unit 330 controls the phase of a radio signal (which may be called a radio wave) reflected by the reflector unit 340. Specifically, the phase control unit 330, based on the H PT and H RP, to control the phase of the radio signal reflected toward the UE200 or the radio base station 150A.
  • a radio signal which may be called a radio wave
  • the phase control unit 330 by maximizing the predetermined eigenvalue of H PT, the combination of the predetermined eigenvalue of H RP, to control the phase of the radio signal.
  • the specific phase optimization algorithm will be described later.
  • the reflector unit 340 is composed of functional parts that reflect radio signals (radio waves). Specifically, the reflector unit 340 is composed of a small multi-element antenna 301 corresponding to Massive MIMO and a plurality of phase shifters 303 (see FIG. 2).
  • the phase control reflector 300 can adopt a configuration in which the phase shifter 303 is sub-arrayed. That is, the phase control reflector 300 has a plurality of sub-arrays. Therefore, a different sub-array may be assigned to each terminal, and the phase control unit 330 may control the phase of the radio signal for each terminal by using the sub-array.
  • phase control unit 330 controls the phase for each sub-array (that is, a pseudo-sub-array for the terminal) corresponding to one propagation channel selected in MultiUser-MIMO (MU-MIMO).
  • MU-MIMO MultiUser-MIMO
  • a plurality of reflector elements constituting the phase control reflector 300 are sequentially assigned according to the communication quality with the terminals (the reflector elements may be assigned to the plurality of terminals so that the quality is equal, or assigned. By doing so, a pseudo sub-array may be constructed and controlled.
  • phase control unit 330 may convert the radio signal received from the radio base station 150A or UE200 into a baseband signal (equivalent low frequency system) and control the phase in the equivalent low frequency system.
  • the equivalent low frequency system can be expressed as a virtual system in which only the digital region represented by the phase and amplitude of the radio signal (radio wave) is extracted.
  • phase control unit 330 may control the phase of the radio signal in the radio frequency (RF) band without converting to the equivalent low frequency system.
  • RF radio frequency
  • the phase control reflector 300 controls (changes) only the phase of the radio signal (radio wave) by the phase control unit 330, and amplifies the power of the reflected (relayed) radio signal. There is no power supply.
  • FIGS. 4A and 4B show an example of forming an antenna beam by a conventional radio base station and an example of forming an antenna beam by a radio base station corresponding to Massive MIMO, respectively.
  • the conventional radio base station 100P that does not support Massive MIMO forms a beam BM11 with a wide beam width.
  • the radio base station 150A corresponding to Massive MIMO can transmit the beam BM21 or the beam BM22 having a beam width narrower than that of the beam BM11.
  • Massive MIMO generally means MIMO communication using an antenna having 100 or more antenna elements, and wireless communication at a higher speed than before is possible due to the multiplexing effect of multiple streams.
  • BF beamforming
  • the beam width can be dynamically changed depending on the frequency band used or the state of UE200, such as beam BM21 or narrower beam BM22.
  • effects such as reduction of interference and effective use of wireless resources can be expected.
  • the antenna element is proportional to the wavelength of the radio frequency used, if the number of antenna elements is the same, the antenna can be miniaturized as the frequency increases. That is, even with the same antenna size, a large number of antenna elements can be accommodated. In other words, the decrease in received signal strength due to the increase in propagation loss in the high frequency band can be recovered by the BF gain.
  • the radio signal (radio wave) transmitted by the radio base station 100P reaches a long distance even if the beam width is wide as in the beam BM11 (see FIG. 4A).
  • FIG. 5 is an explanatory diagram of typical problems in the case of using the high frequency band.
  • a dead zone is likely to occur due to the strong straightness of radio waves.
  • the radio quality will be significantly deteriorated.
  • communication may be interrupted.
  • Step 1 Estimate the propagation channel information ( HPT ) between the radio base station and the phase control reflector based on the reference signal (or assume that the positions of the radio base station and the phase control reflector are unchanged. , The phase control reflector may be acquired in advance) - (Step 2): when detecting a radio quality degradation in the terminal transmits a reference signal to the phase control reflector, estimates the propagation channel information between terminals - phase control reflector (H RP) (or H PT is Based on the reference signal (RS) included in the radio signal transmitted from UE200, assuming that the radio base station 150A is known and the propagation channel does not fluctuate, the radio base station 150A has radio base stations 150A and UE200.
  • H RP phase control reflector
  • FIG. 6 is a flow diagram showing more specifically the operation according to the above-mentioned procedures 1 to 4, in which data is transmitted and received via the above. Specifically, FIG. 6 shows a phase optimization operation flow of a radio signal using a phase control reflector.
  • the radio base station (for example, the radio base station 150A) transmits a reference signal to the phase control reflector 300 (S10).
  • the type of the reference signal (RS) is not particularly limited, and CSI-RS, DM-RS and the like can be appropriately used.
  • Phase control reflector 300 based on the reference signal from the radio base station, estimates the H PT (S20). Specifically, the phase control reflector 300 sets the propagation channel of the radio base station to the phase control reflector 300, that is, the individual communication paths of radio communication between the radio base station and the phase control reflector 300, based on the reference signal. Estimate and generate propagation channel information.
  • the UE200 transmits a reference signal to the phase control reflector 300 (S30).
  • the type of the reference signal is not particularly limited, and DM-RS, SRS, or the like can be appropriately used.
  • the timing at which the UE 200 transmits a reference signal to the phase control reflector 300 is typically when a deterioration in radio quality is detected as described above, but the timing is not necessarily limited to such timing.
  • the UE 200 may send a reference signal to the phase control reflector 300 based on explicit or implicit instructions from the network.
  • the phase control reflector 300 estimates the H RP based on the reference signal from the terminal (S40). Specifically, the phase control reflector 300 estimates and propagates the propagation channel of the terminal to the phase control reflector 300, that is, the individual communication path of the wireless communication between the terminal and the phase control reflector 300 based on the reference signal. Generate channel information.
  • Phase control reflector 300 based on the estimated H PT and H RP, reflecting derives the optimum phase combination to be applied to radio signal (relay) (S50). Specifically, the phase control reflector 300 determines the optimum phase combination based on the phase optimization algorithm described later.
  • the radio base station transmits a radio signal to the phase control reflector 300, and the radio signal is reflected by the phase control reflector 300 toward the terminal. As a result, data is transmitted from the radio base station to the terminal via the phase control reflector 300 (S60).
  • phase control reflector 300 Similarly, regarding the direction from the terminal to the wireless base station (upward direction), data is transmitted from the terminal to the wireless base station via the phase control reflector 300.
  • the phase control reflector 300 estimates HPT and H RP and derives the optimum phase combination applied to the radio signal. However, the estimation of HPT and H RP and the phase are derived. Either or both of the derivation of the combination may be performed by the radio base station or the terminal, and the result may be notified (feedback) to the phase control reflector 300.
  • FIG. 7 shows an estimation example of propagation channel information (H PT , H RP ) according to the first embodiment. This embodiment can be applied to a static environment in which the UE200 (terminal) does not move much.
  • the radio base stations 150A and UE200 transmit a reference signal for channel estimation toward the phase control reflector 300.
  • the phase control reflector 300 estimates the propagation channel information ( HPT , H RP ) and derives the optimum phase combination.
  • the UE200 When the UE200 detects deterioration of radio quality due to changes in the surrounding propagation environment, the UE200 retransmits the reference signal to the phase control reflector 300 and updates the propagation channel information.
  • FIG. 8 shows an estimation example of propagation channel information (H PT , H RP ) according to the second embodiment. This embodiment can be applied to a dynamic environment in which the UE200 (terminal) moves.
  • the propagation channel information (H RP ) between the UE 200 and the phase control reflector 300 fluctuates. Therefore, it is necessary to update the H RP according to the degree of the fluctuation.
  • the UE 200 updates the H RP held by the phase control reflector 300 by appropriately transmitting a reference signal to the phase control reflector 300 based on the radio quality (for example, shown in the figure). As such, H'RP to H " RP ).
  • the phase control reflector 300 derives the optimum phase combination based on the updated H" RP .
  • the H RP may be updated at appropriate time intervals regardless of the radio quality.
  • FIG. 9 shows an estimation example of propagation channel information (H PT , H RP ) according to the third embodiment. This embodiment can be applied to a multi-user environment.
  • phase control reflectors are installed, and one phase control reflector is assigned to each user (Fig.) To realize multi-user communication.
  • FIG. 9 shows an example of 2MU-MIMO.
  • the phase control reflector 300A is assigned for the UE 200A
  • the phase control reflector 300B is assigned for the UE 200B.
  • the phase control reflector 300A estimates (or acquires) the H 1 PT and H 1 RP for the UE 200A.
  • the phase control reflector 300B estimates (or acquires) H 2 PT and H 2 RP for UE 200B.
  • Phase Optimization Algorithm The following describes an example of the phase optimization algorithm applied to the above-mentioned phase control reflector.
  • D RP and D PT are power components, and ⁇ is a weight component.
  • W is taken into consideration and the phase combination is derived so as to increase the signal-to-noise ratio (SN ratio).
  • the number of antennas M of the terminal (reception) and the number of antennas N of the radio base station (transmission) are less than the number K of the reflectors.
  • the upper left of the matrix ( ⁇ RP1 , ⁇ PT1 ) corresponds to the first eigenvalue component.
  • (( ⁇ RP2 , ⁇ PT1 ) corresponds to the second eigenvalue component of H RP and the first eigenvalue component of H PT .
  • the first m eigenvalues of H RP (the power component maximum) maximize the combination of the first n eigenvalues of H PT If you want to, can be achieved by maximizing the coefficient of xi] mn.
  • ⁇ mn is
  • the component of ⁇ 11 may be increased.
  • the weight components contained in ⁇ mn are in-phased.
  • the phase value will be either 0 or ⁇ (or ⁇ / 2, 3 ⁇ / 2), but the weight component contained in ⁇ mn will be any of them. It will be aligned to the phase (0, ⁇ ) or ( ⁇ / 2, 3 ⁇ / 2).
  • the phase (0, ⁇ ) is used, the imaginary part is discarded and the real part is adjusted to the positive or negative direction.
  • ( ⁇ / 2, 3 ⁇ / 2) is used, the real part is discarded and the imaginary part is adjusted to the positive or negative direction.
  • phase value 4 values (2 2 ) or 8 values (2 3 ).
  • the phase control reflector 300 based on the propagation channel information (H PT and H RP), can control the phase of the radio signal reflected toward the UE200 or the radio base station 150A.
  • phase noise included in the radio signal on the receiving side can be greatly reduced.
  • a high frequency band of several GHz to several tens of GHz or more it can exert a great effect in reducing phase noise.
  • phase control reflector 300 reflects (relays) the radio signal between the radio base station and the terminal, it can contribute to the elimination of the dead zone even when a high frequency band having high straightness of radio waves is used.
  • the phase noise can be greatly reduced while eliminating the dead zone.
  • the phase control reflector 300 by controlling the phase of the radio signal reflected toward the UE200 or radio base station 150A, optimization and predetermined eigenvalues of H PT, the combination of the predetermined eigenvalue of H RP To do.
  • the phase control reflector 300 based on the phase optimization algorithm described above, the eigenvalues ingredients in the specified H PT and H RP, that is, to select the best combination of phase components. As a result, the phase noise can be significantly reduced while using the phase control reflector 300.
  • phase control reflector 300 in the phase control reflector 300, a different sub-array is assigned to each terminal, and the phase of the radio signal can be controlled by using the sub-array. Therefore, appropriate phase control for each terminal can be realized without increasing the number of phase control reflectors 300.
  • the phase control reflector 300 can convert the radio signal received from the radio base station 150A or UE200 into an equivalent low frequency system and control the phase in the equivalent low frequency system.
  • the phase control reflector 300 can control the phase of the radio signal in the radio frequency (RF) band without converting to the equivalent low frequency system.
  • RF radio frequency
  • phase control of the radio signal can be realized according to the performance or installation conditions required for the phase control reflector 300.
  • the direction from the radio base station to the terminal is mainly described, but as appropriately described in the above-described embodiment, the radio from the terminal to the radio base station direction (upward direction) is mainly described.
  • the phase of the signal may also be controlled.
  • each functional block is realized by any combination of at least one of hardware and software.
  • the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices may be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
  • the functional block may be realized by combining the software with the one device or the plurality of devices.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption.
  • broadcasting notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these.
  • a functional block that makes transmission function is called a transmitting unit or a transmitter.
  • the method of realizing each is not particularly limited.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the UE 200 and the phase control reflector 300.
  • the UE 200 and the phase control reflector 300 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
  • the word “device” can be read as a circuit, device, unit, etc.
  • the hardware configuration of the device may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
  • Each functional block of the phase control reflector 300 (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.
  • each function or a part of the functions in the phase control reflector 300 is calculated by the processor 1001 by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and is performed by the communication device 1004. It may be realized by controlling communication or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
  • Processor 1001 operates, for example, an operating system to control the entire computer.
  • the processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
  • CPU central processing unit
  • the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
  • a program program code
  • a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
  • the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001.
  • Processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via a telecommunication line.
  • the memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done.
  • the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.
  • the storage 1003 is a computer-readable recording medium, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
  • Storage 1003 may be referred to as auxiliary storage.
  • the recording medium described above may be, for example, a database, server or other suitable medium containing at least one of memory 1002 and storage 1003.
  • the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
  • Communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.
  • FDD frequency division duplex
  • TDD time division duplex
  • the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
  • the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
  • each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
  • the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
  • the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA).
  • the hardware may implement some or all of each functional block.
  • processor 1001 may be implemented using at least one of these hardware.
  • information notification includes physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), upper layer signaling (eg, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or combinations thereof.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC signaling may also be referred to as an RRC message, for example, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.
  • LTE LongTermEvolution
  • LTE-A LTE-Advanced
  • SUPER3G IMT-Advanced
  • 4G 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • FutureRadioAccess FAA
  • NewRadio NR
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB UltraMobile Broadband
  • IEEE802.11 Wi-Fi (registered trademark)
  • IEEE802.16 WiMAX®
  • IEEE802.20 Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next generation systems extended based on them.
  • a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
  • the specific operation performed by the base station in the present disclosure may be performed by its upper node (upper node).
  • various operations performed for communication with the terminal are performed by the base station and other network nodes other than the base station (for example, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.).
  • S-GW network nodes
  • the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
  • Information and signals can be output from the upper layer (or lower layer) to the lower layer (or upper layer).
  • Input / output may be performed via a plurality of network nodes.
  • the input / output information may be stored in a specific location (for example, memory) or may be managed using a management table.
  • the input / output information can be overwritten, updated, or added.
  • the output information may be deleted.
  • the input information may be transmitted to another device.
  • the determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).
  • the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
  • Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name.
  • Applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, features, etc. should be broadly interpreted.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • a transmission medium For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
  • wired technology coaxial cable, fiber optic cable, twist pair, Digital Subscriber Line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
  • a channel and a symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented.
  • the radio resource may be one indicated by an index.
  • Base Station BS
  • Wireless Base Station Wireless Base Station
  • NodeB NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
  • the base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head: RRH).
  • a base station subsystem eg, a small indoor base station (Remote Radio)
  • Communication services can also be provided by Head: RRH).
  • cell refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.
  • MS mobile station
  • UE user equipment
  • terminal terminal
  • Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
  • At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
  • At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
  • the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
  • at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
  • at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter).
  • communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
  • D2D Device-to-Device
  • V2X Vehicle-to-Everything
  • Each aspect / embodiment of the present disclosure may be applied to the configuration.
  • the mobile station may have the function of the base station.
  • words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
  • the uplink, downlink, and the like may be read as side channels.
  • the mobile station in the present disclosure may be read as a base station.
  • the base station may have the functions of the mobile station.
  • the radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further consist of one or more slots in the time domain.
  • the subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.
  • the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
  • Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, transmission / reception.
  • SCS SubCarrier Spacing
  • TTI transmission time interval
  • At least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
  • the slot may be composed of one or more symbols (Orthogonal Frequency Division Multiple Access (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. Slots may be unit of time based on numerology.
  • OFDM Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot.
  • PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A.
  • PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
  • the wireless frame, subframe, slot, mini slot and symbol all represent the time unit when transmitting a signal.
  • the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
  • one subframe may be referred to as a transmission time interval (TTI)
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI slot or one minislot
  • at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. It may be.
  • the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
  • TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
  • the base station schedules each user terminal to allocate wireless resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
  • the time interval for example, the number of symbols
  • the transport block, code block, code word, etc. may be shorter than the TTI.
  • one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • TTIs shorter than normal TTIs may also be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
  • long TTIs eg, normal TTIs, subframes, etc.
  • short TTIs eg, shortened TTIs, etc.
  • TTI length the TTI length of long TTIs and 1 ms. It may be read as a TTI having the above TTI length.
  • a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
  • the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
  • the number of subcarriers contained in the RB may be determined based on numerology.
  • the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
  • Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
  • One or more RBs include a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, etc. May be called.
  • Physical RB Physical RB: PRB
  • Sub-Carrier Group: SCG sub-carrier Group: SCG
  • REG resource element group
  • PRB pair an RB pair, etc. May be called.
  • the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE).
  • RE resource elements
  • 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
  • Bandwidth Part (which may also be called partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier.
  • RBs common resource blocks
  • PRBs may be defined in a BWP and numbered within that BWP.
  • BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
  • BWP for UL
  • DL BWP BWP for DL
  • One or more BWPs may be set in one carrier for the UE.
  • At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
  • “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
  • the above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples.
  • the number of subframes contained in a wireless frame the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB.
  • the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
  • connection means any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two “connected” or “combined” elements.
  • the connection or connection between the elements may be physical, logical, or a combination thereof.
  • connection may be read as "access”.
  • the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain.
  • Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions can be considered to be “connected” or “coupled” to each other.
  • the reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applicable standard.
  • RS Reference Signal
  • Pilot pilot
  • references to elements using designations such as “first”, “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.
  • determining and “determining” used in this disclosure may include a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as “judgment” or “decision”.
  • judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as “judgment” or “decision”.
  • judgment and “decision” mean that “resolving”, “selecting”, “choosing”, “establishing”, “comparing”, etc. are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include that some action is regarded as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming”, “expecting”, “considering” and the like.
  • the term "A and B are different” may mean “A and B are different from each other.”
  • the term may mean that "A and B are different from C”.
  • Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
  • Wireless communication system 100 100P Wireless base station 150A-150D Wireless base station 200, 200A, 200B UE 300, 300A, 300B Phase control reflector 301 Small multi-element antenna 303 Phase shifter 310 H PT acquisition unit 320 H RP acquisition unit 330 Phase control unit 340 Reflector unit BM11, BM21, BM22 Beam C1, C11 to C14 Cell OB Obstacle 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Landscapes

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

Abstract

Un réflecteur à commande de phase selon la présente invention réfléchit un signal sans fil provenant d'une station de base radio ou d'un terminal. Le réflecteur à commande de phase commande la phase d'un signal sans fil réfléchi vers le terminal ou la station de base radio, sur la base d'informations de canal de propagation HPT entre la station de base radio et le réflecteur à commande de phase et d'informations de canal de propagation HRP entre le réflecteur à commande de phase et le terminal.
PCT/JP2020/022867 2019-08-07 2020-06-10 Système de communication sans fil, réflecteur à commande de phase et procédé de communication sans fil WO2021024611A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019145500 2019-08-07
JP2019-145500 2019-08-07

Publications (1)

Publication Number Publication Date
WO2021024611A1 true WO2021024611A1 (fr) 2021-02-11

Family

ID=74503459

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/022867 WO2021024611A1 (fr) 2019-08-07 2020-06-10 Système de communication sans fil, réflecteur à commande de phase et procédé de communication sans fil

Country Status (1)

Country Link
WO (1) WO2021024611A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022157935A1 (fr) * 2021-01-22 2022-07-28 日本電信電話株式会社 Procédé de contrôle de relais sans fil, et dispositif de relais sans fil
WO2022219757A1 (fr) * 2021-04-14 2022-10-20 日本電信電話株式会社 Système, dispositif, procédé et programme
WO2022219754A1 (fr) * 2021-04-14 2022-10-20 日本電信電話株式会社 Système de commande de communication, procédé de commande de communication, et programme
WO2022239660A1 (fr) 2021-05-13 2022-11-17 Ａｇｃ株式会社 Système de réflecteur, réflecteur actif et procédé d'agencement de réflecteur actif
WO2022239079A1 (fr) * 2021-05-10 2022-11-17 株式会社Ｎｔｔドコモ Dispositif de relais sans fil et procédé de relais sans fil
WO2022249821A1 (fr) * 2021-05-27 2022-12-01 京セラ株式会社 Procédé de commande de communication, terminal sans fil, et station de base
WO2022249820A1 (fr) * 2021-05-27 2022-12-01 京セラ株式会社 Procédé de commande de communication, terminal sans fil, station de base et dispositif ris
WO2023056579A1 (fr) * 2021-10-06 2023-04-13 Qualcomm Incorporated Diversité spatiale avec surface réfléchissante pouvant être commandée
WO2023181118A1 (fr) * 2022-03-22 2023-09-28 日本電気株式会社 Système de commande d'ondes radio, dispositif de commande, procédé de commande d'ondes radio et support lisible par ordinateur non transitoire

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
BASAR, ERTUGRUL ET AL.: "Wireless Communications Through Reconfigurable Intelligent Surfaces", ARXIV, 19 July 2019 (2019-07-19), pages 1 - 20, XP011742786, Retrieved from the Internet <URL:https://arxiv.org/abs/1906.09490> *
CAEKENBERGHE, V. KOEN: "RF MEMS technology for radar sensors", 2009 INTERNATIONAL RADAR CONFERENCE SURVEILLANCE FOR A SAFER WORLD (RADAR 2009, 12 October 2009 (2009-10-12), pages 1 - 6, XP031653000 *
HAMMERSTROM, INGMAR ET AL.: "Power Allocation Schemes for Amplify-and-Forward MIMO-OFDM Relay Links", IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, vol. 6, no. 8, 20 August 2007 (2007-08-20), pages 2798 - 2802, XP011190242, DOI: 10.1109/TWC.2007.06071 *
HOMMA, NAOKI ET AL.: "Manipulating MIMO propagation environment using tunable passive repeater", 2014 ASIA-PACIFIC MICROWAVE CONFERENCE, 4 November 2014 (2014-11-04), pages 504 - 506, XP032750321 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022157935A1 (fr) * 2021-01-22 2022-07-28 日本電信電話株式会社 Procédé de contrôle de relais sans fil, et dispositif de relais sans fil
WO2022219757A1 (fr) * 2021-04-14 2022-10-20 日本電信電話株式会社 Système, dispositif, procédé et programme
WO2022219754A1 (fr) * 2021-04-14 2022-10-20 日本電信電話株式会社 Système de commande de communication, procédé de commande de communication, et programme
WO2022239079A1 (fr) * 2021-05-10 2022-11-17 株式会社Ｎｔｔドコモ Dispositif de relais sans fil et procédé de relais sans fil
WO2022239660A1 (fr) 2021-05-13 2022-11-17 Ａｇｃ株式会社 Système de réflecteur, réflecteur actif et procédé d'agencement de réflecteur actif
WO2022249821A1 (fr) * 2021-05-27 2022-12-01 京セラ株式会社 Procédé de commande de communication, terminal sans fil, et station de base
WO2022249820A1 (fr) * 2021-05-27 2022-12-01 京セラ株式会社 Procédé de commande de communication, terminal sans fil, station de base et dispositif ris
WO2023056579A1 (fr) * 2021-10-06 2023-04-13 Qualcomm Incorporated Diversité spatiale avec surface réfléchissante pouvant être commandée
WO2023181118A1 (fr) * 2022-03-22 2023-09-28 日本電気株式会社 Système de commande d'ondes radio, dispositif de commande, procédé de commande d'ondes radio et support lisible par ordinateur non transitoire

Similar Documents

Publication Publication Date Title
WO2021024611A1 (fr) Système de communication sans fil, réflecteur à commande de phase et procédé de communication sans fil
US20210329648A1 (en) User equipment and base station apparatus
US20210400508A1 (en) User device and base station device
WO2021044603A1 (fr) Terminal et procédé de communication
EP3993529A1 (fr) Terminal
WO2020065891A1 (fr) Équipement utilisateur
JP7244316B2 (ja) 端末及び基地局
JP7223026B2 (ja) 端末、基地局、無線通信システム、及び通信方法
WO2021044602A1 (fr) Terminal et procédé de communication
EP3855867A1 (fr) Dispositif utilisateur et dispositif de station de base
WO2022195888A1 (fr) Dispositif de relais sans fil et procédé de relais sans fil
EP4311123A1 (fr) Dispositif de relais radio et procédé de relais radio
WO2022208824A1 (fr) Dispositif de relais sans fil et procédé de relais sans fil
EP3944690A1 (fr) Dispositif utilisateur et dispositif de station de base
JP2022106228A (ja) 伝搬路制御装置および伝搬路制御方法
WO2021019696A1 (fr) Terminal
WO2021019695A1 (fr) Terminal
WO2020240869A1 (fr) Équipement utilisateur et procédé de communication
WO2022239079A1 (fr) Dispositif de relais sans fil et procédé de relais sans fil
WO2021161478A1 (fr) Terminal et procédé de communication
CN114208261B (zh) 终端及通信方法
EP4319357A1 (fr) Noeud d&#39;émission et procédé d&#39;émission
WO2023002625A1 (fr) Terminal, système de communication sans fil et procédé de communication sans fil
WO2023002629A1 (fr) Terminal, système de communication sans fil et procédé de communication sans fil
RU2792882C1 (ru) Терминал и способ радиосвязи

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20850671

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20850671

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP