WO2022208824A1 - Wireless relay device and wireless relay method - Google Patents

Abstract

This wireless relay device controls the relay state of the device when the device relays radio waves from a wireless base station or a terminal without employing signal interpretation. A signal relating to synchronization or connection is transmitted to or received from the wireless base station or the terminal by the wireless relay device.

Description

Wireless relay device and wireless relay method

The present invention relates to a wireless relay device and a wireless relay method.

The 3rd Generation Partnership Project (3GPP) has specified the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and the next generation specification called Beyond 5G, 5G Evolution or 6G We are also proceeding with

Future networks such as 6G will require even higher quality than 5G. For example, ultra-high-speed communication of tera bps (bit per second) and high-reliability low-delay communication at the level of optical communication.

For this reason, the use of extremely high frequency bands, such as terahertz (THz) waves, is expected. Disadvantages are expected, such as narrow coverage due to low speed and low reliability due to high straightness. It is also necessary to consider how to ensure redundancy and how to increase communication points for each location where 6G communication is required.

As mentioned above, in the high frequency band, there are problems such as the occurrence of dead zones due to the strong straightness of radio waves, so currently passive repeaters and active reflectors (RIS: Reconfigurable Intelligent Surface) are used A method for improving communication quality in a multipath environment or the like is being tried (see Non-Patent Document 1, pp.15-16, etc.). As a result, from the perspective of wireless base stations and terminals, the number of communication points seems to be increasing.

When relaying radio waves by reflecting or transmitting radio waves from radio wave sources such as base stations and terminals (User Equipment, UE) to radio wave receivers, it is necessary to establish and synchronize connections with base stations, UEs, etc. It is necessary to accurately connect and synchronize with each other, such as performing

Therefore, the present invention has been made in view of such circumstances, and provides a radio relay apparatus and a radio relay method that can accurately connect or synchronize with each other between base stations, UEs, and the like. With the goal.

The radio relay device (RIS 300), which is one aspect of the present disclosure, is a control unit (control section 330) and a transmission/reception section (transmission/reception section 350) that transmits or receives a signal related to synchronization or connection between the radio base station (radio base stations 100 and 150) or the terminal (UE 200).

A radio relay method, which is one aspect of the present disclosure, includes a control step for controlling a relay state when relaying radio waves from a radio base station (radio base stations 100, 150) or a terminal (UE 200) without signal interpretation; (radio base station 100, 150) or a terminal (UE 200), and a transmission/reception step of transmitting or receiving a signal related to synchronization or connection.

FIG. 1 is an overall schematic configuration diagram of a radio communication system 10. As shown in FIG. FIG. 2 is a basic configuration diagram of a network using the wireless relay device 300. As shown in FIG. FIG. 3 is a functional block configuration diagram of the wireless relay device 300. As shown in FIG. FIG. 4 is an explanatory diagram of a typical problem when using a high frequency band. FIG. 5 is a diagram showing the relationship between the transmitting antennas (Tx) of the base station 150A and the like, the relay antennas (Sx) of the reflective radio relay apparatus 300, and the receiving antennas (Rx) of the UE 200 and the like. FIG. 6 is a diagram showing the relationship between the transmitting antennas (Tx) of the base station 150A and the like, the relay antennas (Sx) of the transparent radio relay apparatus 300, and the receiving antennas (Rx) of the UE 200 and the like. FIG. 7 is a diagram showing a relationship between radio relay apparatus 300 and base station 100 or UE 200 and control information signaling. FIG. 8 is a diagram showing an example of selecting beams transmitted and received by the RIS in the MetaStructure. FIG. 9 is a diagram showing an example of selecting beams to be transmitted to and received from the RIS by MetaStructure. FIG. 10 is a diagram showing an operation example of the wireless relay device 300 in connection between the base station and the RIS (operation examples 1 and 2). FIG. 11 is a diagram illustrating the behavior of one-step operation example 1. FIG. FIG. 12 is a diagram showing the behavior of the 2-step operation example 1. FIG. 13A and 13B are diagrams showing the behavior of the 3-step operation example 1. FIG. 14A and 14B are diagrams illustrating the behavior of one-step operation example 2. FIG. FIG. 15 is a diagram showing the behavior of the 2-step operation example 2. FIG. FIG. 16 is a diagram showing the behavior of the four-step operation example 2. FIG. FIG. 17 is a diagram showing an operation example of the wireless relay device 300 in connection between the base station and the RIS (operation examples 3 and 4). FIG. 18 is a diagram illustrating the behavior of one-step operation example 3. FIG. FIG. 19 is a diagram showing the behavior of the 2-step operation example 3. FIG. FIG. 20 is a diagram showing the behavior of the 3-step operation example 3. FIG. FIG. 21 is a diagram showing the behavior of one-step operation example 4. FIG. FIG. 22 is a diagram showing an example of the hardware configuration of UE 200, radio relay apparatus 300, and the like.

Hereinafter, embodiments will be described based on the drawings. The same or similar reference numerals are given to the same functions and configurations, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Radio Communication System FIG. 1 is an overall schematic configuration diagram showing an example of a radio communication system 10 according to the present embodiment. The radio communication system 10 is, for example, a radio communication system conforming to 5G New Radio (NR) or 6G, and is composed of multiple radio base stations and multiple terminals.

Specifically, the radio communication system 10 includes a radio base station 100, radio base stations 150A to 150D, and a user terminal 200 (UE 200, User Equipment).

The radio base station 100 is, for example, a radio base station according to 5G to 6G and forms a cell C1. Note that the cell C1 is a relatively large cell and is called a macrocell.

The radio base stations 150A to 150D are also radio base stations conforming to 5G to 6G, but form relatively small cells C11 to C14, respectively. Cells C11 to C14 may be called small cells or semi-macro cells. As shown in FIG. 1, cells C11 to C14 may be formed so as to be included in (overlay with) cell C1 (macrocell).

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. Also, a small cell is interpreted as a generic term for cells that have low transmission power and cover a smaller area than a macro cell.

Note that the radio base station 100 and the radio base stations 150A to 150D may be denoted as gNodeB (gNB) or BS (Base Station). Also, the UE 200 may be written as an MS or the like. Furthermore, the specific configuration of the radio communication system 10 including the numbers and types of radio base stations and terminals is not limited to the example shown in FIG.

Also, the wireless communication system 10 is not necessarily limited to a wireless communication system according to 5G or 6G. For example, the wireless communication system 10 may be a 6G next-generation wireless communication system or a wireless communication system according to Long Term Evolution (LTE).

As an example, the radio base station 100 and the radio base stations 150A to 150D perform radio communication with the UE 200 according to 5G or 6G. The radio base station 100 and radio base stations 150A to 150D and UE 200 control radio signals transmitted from a plurality of antenna elements to generate beams BM with higher directivity. Carrier aggregation (CA) that bundles carriers (CC), dual connectivity (DC) that simultaneously communicates between a UE and two NG-RAN nodes, and radio backhaul between radio communication nodes such as gNBs and radio access to the UE are integrated, such as rated Access and Backhaul (IAB).

In addition, the wireless communication system 10 can also support high frequency bands higher than the following frequency ranges (FR) defined in 3GPP Release 15.

・FR1: 410MHz to 7.125GHz
・FR2: 24.25 GHz to 52.6 GHz
Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz and up to 114.25 GHz. Here, such a high frequency band is referred to as "FR4" for convenience. FR4 belongs to the so-called EHF (extremely high frequency, also called millimeter waves). FR4 is a tentative name and may be called by another name. Alternatively, any frequency band may be supported without being limited to the above frequency band. For example, FR1 and FR2 may be used.

The wireless communication system 10 also includes a wireless relay device 300. In this embodiment, as an example, the radio relay device 300 may be described as a reflector (RIS), a phase control reflector, a passive repeater, an IRS (Intelligent Reflecting Surface), or the like. Specific examples of reflectors (RIS) may be those called metamaterial reflectors, dynamic metasurfaces, metasurface lenses, and the like (see Non-Patent Document 1).

In the present embodiment, radio relay apparatus 300 relays a radio signal transmitted from a radio base station (for example, radio base station 150A) (in the description of the present embodiment, "reflection", "transmission", " At least one of "concentration" (concentrating radio waves to approximately one point) and "diffraction" may be referred to as "relay"). The UE 200 can receive radio signals relayed by the radio relay device 300 . Conversely, the radio relay device 300 may relay the radio signal transmitted from the UE200. The same can be said for the radio base stations 100 (including 150; the same applies hereinafter). That is, radio relay apparatus 300 relays radio signals from radio base station 100 or terminal 200 .

As an example, the radio relay device 300 can change the phase of the radio signal that is relayed toward the radio base station 100 or the terminal 200. From this point of view, radio relay apparatus 300 may be called a variable phase reflector. In the present embodiment, radio relay apparatus 300 may be described as having a function of changing the phase of a radio signal and relaying it, but the present invention is not limited to this. Also, the wireless relay device 300 may be called a repeater, a relay device, a reflect array, an IRS, a transmit array, or the like.

Also, in the present embodiment, the wireless relay device 300 such as RIS may be called a battery less device, a metamaterial functional device, an intelligent reflecting surface, a smart repeater, or the like. As an example, the wireless relay device 300 such as RIS may be defined as having at least one of the following functions.
[UE function]
・Reception function of signals sent from BS (e.g. DL (downlink) signal, SSB (SS Block), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), DM-RS (DeModulation Reference Signal), PT-RS (Phase Tracking Reference Signal), CSI-RS (Channel Status Information Reference Signal), RIS dedicated signal)
Reception of information related to the following metamaterial functions and transmission of signals to BS (e.g. UL (uplink) signal, PRACH (Random Access Channel Preamble), PUCCH (Physical Uplink Control Channel), PUSCH Physical Uplink Control Channel, DM- RS, PT-RS, SRS (Sounding Reference Signal), RIS dedicated signal)
Transmission of information related to the following metamaterial functions ・Frame synchronization function with BS

[Metamaterial function]
Ability to reflect signals sent from BS or UE (e.g. phase change)
The signal may be reflected by changing the phase for each of the plurality of reflecting elements of the RIS, or the common phase may be changed by the plurality of reflecting elements to reflect the signal.
Beam control functions (e.g. TCI (Transmission Configuration Indication)-state, QCL (Quasi Co Location) control functions, beam selection application, spatial filter/precoding weight selection application)
Ability to change the power of signals sent from the BS or UE (e.g. power amplification)
A different power change may be performed for each reflective element, or a common power change may be performed for a plurality of reflective elements.

In addition, "receiving and transmitting" and "relaying" in the wireless relay device 300 such as RIS mean that although the following predetermined function A is performed, transmission is performed without performing predetermined function B. may
A: A phase shifter is applied, but B: A compensation circuit (eg, amplification, filter) is not passed.
A: A phase shifter and compensation circuit are applied, but B: No frequency conversion is involved.

In addition, in the wireless relay device 300 such as RIS, when the phase is changed, the amplitude may be amplified and/or noise may be removed. In addition, "relay" in the wireless relay device 300 such as RIS means transmitting the received signal as it is without performing layer 2/3 level processing, transmitting the signal received at the physical layer level as it is, Alternatively, it may mean transmitting the received signal as it is without signal interpretation (at that time, phase change, amplitude amplification, noise removal, etc. may be performed).

(2) Basic Configuration of Network Using Wireless Relay Device 300 Next, the basic configuration of a network using the wireless relay device 300 will be described. FIG. 2 is a basic configuration diagram of a network using the wireless relay device 300. As shown in FIG.

As shown in FIG. 2, as an example, the radio relay device 300 intervenes between the radio base station 150A (other radio base station 100 or the like) and the UE 200, and is interposed between the radio base station 150A and the UE 200. relays (reflects, transmits, aggregates, diffracts, etc.) radio signals transmitted and received in

As a specific example, the radio base station 150A and the UE 200 directly transmit and receive radio signals without going through the radio relay device 300 when the radio quality is good. When the radio quality deteriorates, such as when there is an obstacle between the radio base station 150A and the UE 200, the radio relay device 300 relays radio signals transmitted and received between the radio base station 150A and the UE 200.

Specifically, the radio relay apparatus 300 generates propagation path information between the radio wave source such as the radio base station 150A and the UE 200 and the relay antenna based on the change in received power during control of the variable section 303 such as a variable phase shifter. H _{PT and} H _RP are estimated, and based on the estimated propagation path information, a variable section 303 such as a variable phase shifter is controlled to relay the radio signal to the radio wave receiving destination such as the UE 200 . In addition to estimating the channel information H _{PT and} H _RP , the radio relay apparatus 300 controls the variable section 303 such as a variable phase shifter based on the control information received from the radio base station 150A or the UE 200. Thus, the radio signal may be relayed toward the radio wave reception destination such as the UE 200.

Here, a propagation path or a propagation channel is an individual communication path for wireless communication, and here is a communication path between each transmitting/receiving antenna (BS ant. and MS ant., etc. in the figure).

As an example, the radio relay device 300 includes a small multi-element antenna 301 compatible with Massive MIMO, and a variable phase shifter or phase shifter 303 that changes the phase of a radio signal, substantially a radio wave, to a specific phase, Phase shifter 303 is used to control the phase of radio waves relayed to UE 200 or radio base station 150A. The following document may be referred to for a specific phase control method.
Venkat Arun and Hari Balakrishnan, “RFocus: Beamforming Using Thousands of Passive Antennas”, 17th USENIX Symposium on Networked Systems Design and Implementation (NSDI '20), February 25-27, 2020, Santa Clara, CA, USA, pp.1047- 1061
Qingqing Wu, and Rui Zhang, “Intelligent Reflecting Surface Enhanced Wireless Network via Joint Active and Passive Beamforming”, IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 18, NO. 11, NOVEMBER 2019, pp.5394-5409

(3) Functional Block Configuration of Wireless Relay Device 300 FIG. 3 is a functional block configuration diagram of the wireless relay device 300. As shown in FIG. As shown in FIG. 3 , radio relay device 300 includes antenna 301 , variable section 303 , control section 330 , and transmission/reception section 350 .

Antenna 301 is at least one antenna connected to variable section 303, as will be described later with reference to FIGS. For example, antenna 301 may be arranged as an array antenna. In this embodiment, antenna 301 may be particularly called a relay antenna.

The variable section 303 is connected to the antenna 301 and can change the phase, load, power, amplitude, noise, and the like. For example, variable section 303 may be a variable phase shifter, a phase shifter, an amplifier, or the like. For example, by changing the phase of the radio wave that reaches the relay antenna from the radio wave source, the direction and beam of the radio wave can be changed.

The control unit 330 is control means for controlling the variable unit 303. In the present embodiment, control section 330 functions as a control section that controls the relay state when radio waves from radio base station 100 or terminal 200 are relayed without signal interpretation. Here, the control unit 330 may change the relay state based on control information received from the radio base station 100 or the terminal 200, and based on the reception state of radio waves from the radio base station 100 or the terminal 200, You can change the state. For example, the control unit 330 may select appropriate reception beams and transmission beams (directions) based on control information such as SSB, and control the variable unit 303 for this purpose. Similarly, control section 330 may select an appropriate combination of the reception direction and transmission direction based on criteria such as the highest reception quality and reception power from the reception state, and may control variable section 303 for that purpose.

Further, in the present embodiment, the control unit 330, for example, based on information (including information and control information estimated from the reception state) on the propagation path between the UE 200 or the radio base station 150A and the relay antenna 301 can control the variable unit 303. For example, the control unit 330 changes the phase of the radio wave received from the radio base station 150A by using a known method such as an active repeater or RIS, without using transmission power, thereby changing the phase of the radio wave receiving destination (in this case, UE 200) can be relayed in a specific direction. Specifically, control section 330 controls the phase of the radio signal for relaying to UE 200 or radio base station _150A based on estimated _HPT and HRP. That is, it is possible to relay radio waves in a specific direction by changing the phase of an array antenna or the like based on the same principle as beam forming. Note that the wireless relay device 300 controls (changes) only the phase of the wireless signal (radio wave) by the control unit 330, and relays the wireless signal without power supply without amplifying the power of the wireless signal to be relayed. You may

Also, the transmitting/receiving unit 350 is transmitting/receiving means for transmitting/receiving radio waves, signals, and various types of information. In the present embodiment, transmitting/receiving section 350 transmits/receives signals related to synchronization or connection with radio base station 100 (including 150; the same shall apply hereinafter) or terminal 200 (various signals exemplified in the above-described UE function and metamaterial function). It may also be a signal for discovering a radio base station or a terminal, or a signal for detection/identification.) . Specifically, the transmitting/receiving unit 350 may transmit/receive signals for connection/synchronization with the radio base station 100 or the terminal 200 . For example, various signals described above in the UE function and the metamaterial function may be used. A specific example of signal transmission/reception (signaling example, etc.) will be described later.

Further, the transmitting/receiving unit 350 may function as a receiving unit that acquires information according to the reception state, or as a receiving unit that acquires control information or the like from the radio base stations 100, 150A or UE200. For example, the transmitting/receiving unit 350 receives various signals such as SSB (including various signals exemplified in the above-described UE function and metamaterial function) transmitted from the radio base station 100, 150A or UE 200 as control information. You may Further, the transmitting/receiving unit 350 adjusts the propagation path between the radio wave generation source (eg, radio base station 150A, UE 200) and the relay antenna 301 based on the reception state (eg, change in received power, etc.) when the variable unit 303 is controlled. Information (H _PT , H _RP ) may be estimated.

H _PT and H _RP can be expressed as follows.

 

M is the number of terminal (receiving) antennas, N is the number of radio base station (transmitting) antennas, and K is the number of relay antennas.

The propagation path information (propagation channel information) on each propagation path is specifically information such as amplitude and phase, and in the present embodiment, it is information estimated on the propagation path of the radio waves arriving at relay antenna 301. . As an example, the transmitting/receiving unit 350 detects changes in received power when the phase of the variable unit 303 of each relay antenna 301 in the array is switched to orthogonal, based on the same principle as I/Q (In-phase/Quadrature) detection. Based on this, the propagation path information of relay antenna 301 may be estimated.

(4) Configuration Example of Antenna, etc. Next, a configuration example centering on the relay antenna 301 will be described. First, a typical problem in the case of using a high frequency band will be described, and an antenna configuration example and the like in radio relay apparatus 300 that can solve the problem will be described.

(4.1) Problem A radio base station supporting Massive MIMO can transmit beams. Massive MIMO generally means MIMO communication using an antenna having 100 or more antenna elements, and enables faster wireless communication than before due to the effect of multiplexing multiple streams. Advanced beamforming (BF) is also possible. The beam width can be dynamically changed depending on the frequency band used, the state of the UE 200, or the like. Also, it is possible to increase the received signal power by beam forming (BF) gain by using a narrow beam. Furthermore, effects such as reduction of interference and effective use of radio resources can be expected.

FIG. 4 is an explanatory diagram of a typical problem when using a high frequency band. As shown in FIG. 4, when a high frequency band of several GHz to several tens of GHz or more is used, dead zones are likely to occur due to the strong straightness of radio waves. If the line between the radio base station 150A and the UE 200 is visible, there is no effect on radio communication between the radio base station 150A and the UE 200 even if the high frequency band is used. On the other hand, when the line of sight between the radio base station 150A and the UE 200 is blocked by an obstacle OB such as a building or tree, the radio quality is greatly degraded. In other words, when the UE 200 moves to the dead zone blocked by the obstacle OB, communication may be interrupted.

Considering the existence of applications (remote control, etc.) that take advantage of the high-speed, large-capacity, and low-delay characteristics of 5G and 6G, the dead zone is eliminated, and the communication within the wireless communication system 10 is not interrupted. It is important that the device and the terminal continue to be connected.

Therefore, technology has been developed that can relay radio waves between the base station 150A and the UE 200, such as radio wave propagation control devices such as active repeaters and RIS. In this way, by controlling the propagation characteristics of base station signals, it is possible to improve communication characteristics, expand coverage and ensure communication redundancy without the need for signal sources, and reduce installation and operation costs by increasing the number of base stations. be able to.

The RIS (reflector) can relay (reflect, etc.) radio waves and signals such as beams coming from a base station or terminal in a predetermined direction and deliver them to the terminal or base station. Conventional wireless repeaters are divided into passive and active types. Passive types have the advantage of not requiring control information, but they are not capable of fine beam control and cannot follow moving objects or environmental changes. be. On the other hand, the active type changes the control of the reflection angle, beam width, etc. according to the position of the mobile station. The active type has the disadvantage of requiring control information and increasing overhead, but it is possible to perform fine beam control by changing the load (phase) state of the control antenna, and to variably control the propagation characteristics of radio waves. , and can follow moving objects, environmental changes, and the like.

There are two types of active wireless relay devices (radio wave propagation control devices, etc.) and control methods: feedback (FB) norms and propagation path information norms. In the FB standard, the variable type radio wave propagation control device searches for the optimum condition by having the UE etc. feed back the communication state when the load (phase) state is changed at random. On the other hand, according to the propagation path information standard, the load state is determined based on the propagation path information between the radio base station and the radio wave propagation control device, and optimum radio wave propagation control becomes possible. In this embodiment, any type can be applied.

In addition, as a relay method, there are types such as reflection, transmission, diffraction, and consolidation. In this embodiment, as an example, the configuration examples of the reflection type and the transmission type will be described below, but it is limited to these. (See Non-Patent Document 1, etc. for the diffraction type and the condensed type).

(4.2) Reflective type An example of the system configuration of the reflective wireless relay device 300 will be described with reference to FIG. FIG. 5 is a diagram showing the relationship between the transmitting antennas (Tx) of the base station 150A and the like, the relay antennas (Sx) of the transparent radio relay apparatus 300, and the receiving antennas (Rx) of the UE 200 and the like. As shown in FIG. 5, in the present embodiment, MIMO is taken as an example, and there are a plurality of propagation paths between Tx-Sx and a plurality of propagation paths between Sx-Rx. controls variable section 303 such as a variable phase shifter of antenna 301 to relay radio waves.

As shown in FIG. 5, in the case of the reflection type, the arrayed relay antennas 301 are arranged facing the same direction. Thereby, the propagation path of relay antenna 301 can be estimated based on the reception state observed when the phase condition of relay antenna 301 is changed in a plurality of ways.

(4.3) Transmissive type An example of the system configuration of the transmissive wireless relay device 300 will be described with reference to FIG. FIG. 6 is a diagram showing the relationship between the transmitting antennas (Tx) of the base station 150A and the like, the relay antennas (Sx) of the transparent radio relay apparatus 300, and the receiving antennas (Rx) of the UE 200 and the like. As shown in FIG. 6, in the present embodiment, MIMO is taken as an example, and there are a plurality of propagation paths between Tx-Sx and a plurality of propagation paths between Sx-Rx. , relays radio waves arriving from one side to the other side via a variable section 303 such as a variable phase shifter of a relay antenna 301, as shown in the figure. In this way, in the case of the transmissive type, the reference antenna 301A and the relay antenna 301 are arranged in pairs facing opposite directions so that radio waves arriving from one side can be relayed to the other side. there is Regardless of whether it is a transmissive type or a reflective type, a power detector or the like may be configured to detect the power reaching relay antenna 301, and the reception state may be measured. Also, the propagation path of relay antenna 301 can be estimated based on the received signals observed when the phase conditions of relay antenna 301 are changed in a plurality of ways.

Here, an example of a method for controlling the relay state based on the control information received by the radio relay device 300 from the base station 100 or the UE 200 will be described below with reference to FIGS. 7 to 9. FIG.

In this example, an example in which Meta Structure is included in signaling as control information will be explained. FIG. 7 is a diagram showing a relationship between radio relay apparatus 300 and base station 100 or UE 200 and control information signaling. As shown in FIG. 7, signaling is performed between the radio relay apparatus 300 and the base station 100 or the UE 200 in order to perform beam control of the radio relay apparatus 300 such as RIS. For example, a Meta Structure for beam selection is included in the transmitted and received signals, and the reception quality of the transmitted beam is fed back.

An example of beam control in which the beam is changed by the Meta Structure without changing the beam of the base station is explained below. FIG. 8 is a diagram showing an example of selecting beams transmitted and received by the RIS in the MetaStructure. FIG. 9 is a diagram showing an example of selecting beams to be transmitted to and received from the RIS by MetaStructure.

As shown in FIG. 8, the Meta Structure beam selection allows the RIS 300 to appropriately select the beams it transmits/receives. Also, as shown in FIG. 9, the base station 100 or the UE 200 can appropriately select a beam to direct when transmitting to the RIS or a beam to receive from the RIS.

(5) Operation Example of RIS Next, the following three cases of operation examples of the wireless relay device 300 such as the RIS will be described.
Case A: Control information is communicated between the base station and the RIS, and the RIS operation is determined based on the control information.
Case B: Communicate control information between the mobile station and the RIS, and determine the operation of the RIS based on the control information
Case C: RIS autonomously determines operation without exchanging control information with base station and mobile station

In each Case, at least one of the following operations may be performed. In addition, in this embodiment, synchronization/connection with a base station or a mobile station will be described in detail.
Synchronization with discovered base station / Synchronization with connected mobile station / Synchronization between connected base station and mobile station / Beam selection based on information from connected base station Beam selection based on information from mobile station
Feedback specification accompanying Meta Structure control
Signaling mechanism for RIS beam control
Beam selection by RIS Beam switching when multiple mobile stations exist Communication quality report to cooperative base station/mobile station by multiple RIS

(5.0) Basic Operation The RIS 300, which is an example of a wireless relay device that controls the relay state when relaying radio waves from the wireless base station 100 (including 150A, etc.) or the terminal 200 without signal interpretation, It transmits or receives a signal related to synchronization or connection with radio base station 100 or terminal 200 . Specifically, the following operation example can be considered as an example. Each operation example will be described in detail below.
<Connection between base station and RIS>
Operation example 1: Connection operation example 2 when the base station transmits the first signal related to the connection between the base station and the RIS Connection operation example 2: Connection when the RIS transmits the first signal related to the connection between the base station and the RIS < Connection between mobile station and RIS>
Operation example 3: Connection when the mobile station transmits the first signal related to the connection between the mobile station and the RIS Operation example 4: When the RIS transmits the first signal related to the connection between the mobile station and the RIS Connection

(5.1) Operation example 1
FIG. 10 is a diagram showing an operation example of the wireless relay device 300 in connection between the base station and the RIS (operation examples 1 and 2). As shown in FIG. 10, operation examples 1 and 2 relate to the connection between the base station 100 and the RIS300. Here, the RIS 300 may transmit and receive the following information when connecting with the base station 100.
<Example of information sent by RIS when connecting>
・Information identifying RIS ・Request for connection with base station (request to start connection, request to resume connection, or request to reconnect)
・RIS capability (e.g. RIS beam information (number of beams that can be directed, number of directions, direction/angle, etc.))
・Security control information ・RIS location information ・Connection purposes (examples of connection purposes: location registration, incoming/outgoing calls, emergency calls, priority calls)
・Information to notify that the connection has been completed, etc.

<Example of information received by RIS when connected>
・Information related to RIS signal transmission timing (e.g. Timing Advance (TA) information)
・RIS identifier ・RIS capability inquiry
・Connection request (connection start request, connection restart request, or reconnection request)
・Security control information ・System information (e.g. radioResourceConfigDedicated)
・Purpose of connection (Examples of purpose of connection: location registration, incoming/outgoing calls, emergency calls, priority calls)
・Information related to beam (QCL/TCI-state/precoder, beam pattern at a certain synchronization, etc. (representing RIS beam behavior at SSB, periodicity, etc.))
・Information related to communicating UE (UE location/channel quality/beam related/UE-ID/RNTI, etc.)
・Information to notify that the connection has been completed, etc.

Here, FIG. 11 is a diagram showing the behavior of one-step operation example 1. FIG. As shown in FIG. 11, the RIS 300 may receive a signal from the base station 100 when the base station transmits the initial signal for connection between the base station and the RIS (Step 1).

Here, FIG. 12 is a diagram showing the behavior of the 2-step operation example 1. FIG. As shown in FIG. 12, in Step 1, the RIS 300 receives a connection request signal from the base station 100, and in Step 2, the RIS 300 transmits connection information based on the signal received from the base station 100. good.

Here, FIG. 13 is a diagram showing the behavior of the 3-step operation example 1. FIG. As shown in FIG. 13, in Step 1, the RIS 300 receives a connection request signal from the base station 100, in Step 2, the RIS 300 transmits connection information based on the signal received from the base station 100, and in Step 3 Then, the RIS 300 may receive connection information from the base station 100 .

Here, the following options may be adopted at each step.

<Step 1: Receive connection request or reconnection request signal from base station>
• The RIS may receive connection requests (outgoing)/reconnection requests.
The resource of the signal received by the RIS may be determined based on the transmitted signal when performing detection/identification.
The resource of the signal received by the RIS may be determined based on the signal received when performing detection/identification.

Sequences/resources/parameters may be defined or preset in the RIS.
1-1: The signal received at this time may be the signal received when performing detection/identification.
1-2: The signal received at this time may be a signal specified for RIS.

The RIS may refuse reconnection to the base station when conditions such as the following examples are met.
・Poor radio quality (e.g. received SINR is below the threshold)
・The RIS does not retain information on the base station ・Security control is not activated between the RIS and the base station

If reconnection is not performed, the RIS may behave as follows.
OptionA: Do not make a predetermined response to the base station
OptionB: Notify reconnection failure to the base station

(5.2) Operation example 2
In the operation example 1, the case where the base station transmits the first signal related to the connection between the base station and the RIS was explained, but conversely, the RIS transmits the first signal related to the connection between the base station and the RIS. Operation example 2 will be described below for the case.

Here, FIG. 14 is a diagram showing the behavior of one-step operation example 2. FIG. As shown in FIG. 14, when the RIS transmits the first signal related to connection between the base station and the RIS, the signal is transmitted from the RIS 300 to the base station 100 (Step 1).

Here, FIG. 15 is a diagram showing the behavior of the 2-step operation example 2. FIG. As shown in FIG. 15, in Step 1, the RIS 300 may transmit connection-related information to the base station 100, and in Step 2, the RIS 300 may receive connection-related information from the base station 100. FIG. Note that Steps 1 and 2 may be performed multiple times.

Here, FIG. 16 is a diagram showing the behavior of the four-step operation example 2. FIG. As shown in FIG. 16, in Step 1, the RIS 300 transmits connection-related information to the base station 100, in Step 2, the RIS 300 receives connection-related information from the base station 100, and in Step 3, the RIS 300 connects to the base station 100. , and in Step 4, the RIS 300 may receive the connection information from the base station 100 . In this way, two steps (one round trip) can prevent delays, while four steps (two round trips) can avoid collisions and save resources.

Here, the following options may be adopted at each step.

<Step 1: RIS may send connection information to the base station>
At this time, the RIS may send a connection request (outgoing)/reconnection request.
Sequences/resources/parameters may be defined or preset in the RIS. Here, the connection request may be made with the signal transmitted and received when detection/identification is performed, or the connection request may be made with a different signal using the same settings. For example, settings such as resources may be the same, but different signals may be used.
1-1: The RIS may send a signal to the base station corresponding to the signal received from the base station.
1-1a: A signal may be sent to the base station based on the signal received during detection/identification. In this case, the signal transmitted by the RIS may be the detection/identification signal. For example, when PRACH is transmitted after receiving SSB, the PRACH resource may be the same as or different from the signal transmitted by the terminal to connect to the base station.

1-1b: The RIS may transmit a connection request signal based on the RAR transmitted from the base station.
1-1c: The RIS may send a connection request signal based on the signal received in Step2.
1-2: The RIS may transmit a predetermined signal independently of the signal transmitted from the base station.
Signal transmission by the RIS may always be performed at a predetermined cycle.

Also, in Step 1, the RIS may issue a reconnection request at this time.
In the case of reconnection, the signal control may be different from that in origination.
In the case of reconnection, the information to be transmitted and received may be different from that at the time of origination.

The RIS may issue a reconnection request when conditions such as the following examples are met.
・Degradation of radio quality (e.g. received SINR falls below the threshold)
・Base station holds RIS information ・Security control is activated between RIS and base station

It may be determined that reconnection has failed when conditions such as the following example are met.
・A certain amount of time has elapsed At this time, a call or reconnection request may be made again according to a predetermined rule.
• When a reconnection failure is received from the base station At this time, the call or reconnection request may be made again based on the instructions of the base station or according to a predetermined rule.

<Step 2: The RIS may receive connection information from the base station>
At this time, the RIS may determine whether the connection is complete based on the signal.
Example 1: Receiving connection completion information from the base station Example 2: Receiving connection information from the base station Example 3: Not receiving connection failure information from the base station for a certain period of time, etc.

2-2a: Step 1 may be performed again if the RIS does not receive a signal from the base station within a certain period of time. The time at this time may be determined based on a predetermined rule or a signal received from the base station. For example, RAR may be received again or PRACH may be sent again after the Contention resolution timer has passed.

2-2b: If it is determined that the connection has failed based on the signal transmitted from the base station, Step 1 may be performed again. For example, based on the DCI transmitted by the base station, the RIS may retransmit Msg3 (Message3).
2-3c: The RIS may report to the base station whether the connection is complete based on the signal sent by the base station.
Example: Transmit connection completion using HARQ-ACK Example: Do not send a connection failure signal to the base station

(5.3) Operation example 3
FIG. 17 is a diagram showing an operation example of the wireless relay device 300 in connection between the base station and the RIS (operation examples 3 and 4). As shown in FIG. 17, operation examples 3 and 4 relate to the connection between the terminal 200 and the RIS 300. FIG. Here, the RIS 300 may transmit and receive the following information when connecting with the terminal 200.

<Information received by the mobile station when connecting/Information sent by the RIS when connecting>
・Information that identifies the RIS ・Connection request (connection start request, connection restart request, or reconnection request)
・RIS capability (e.g. RIS beam information (number of beams that can be directed, number of directions, direction/angle, etc.))
・Security control information ・Location information/direction of RIS ・Purpose of connection (Examples of purpose of connection: location registration, incoming/outgoing calls, emergency calls, priority calls)
・Information to notify that the connection has been completed, etc.

<Information sent by the mobile station when connecting/Information received by the RIS when connecting>
・Information related to RIS signal transmission/reception timing Example: Timing Advance (TA) information ・Mobile station identifier ・Connection request (connection start request, connection restart request, or reconnection request)
・RIS capability inquiry
・Mobile station capability
・Security control information ・Information related to beam (QCL/TCI-state/precoder, beam pattern at a certain synchronization, etc. (representing RIS beam behavior in SSB, periodicity, etc.))
・Information related to communicating base stations (PLMN information/system information (resources, etc.)/communication quality, etc.)
・Information required for connection (Example: radioResourceConfigDedicated)
・Information to notify that the connection has been completed, etc.

Here, FIG. 18 is a diagram showing the behavior of one-step operation example 3. FIG. As shown in FIG. 18, when the mobile station transmits the initial signal for connection between the mobile station and the RIS, the RIS 300 may receive the signal from the mobile station 200 (Step 1).

Here, FIG. 19 is a diagram showing the behavior of the 2-step operation example 3. FIG. As shown in FIG. 19, in Step 1, the mobile station 200 transmits a connection request signal to the RIS 300/RIS 300 receives the connection request signal from the mobile station 200, and in Step 2, the RIS 300 receives the signal received from the mobile station 200. You may send information related to connection to

Here, FIG. 20 is a diagram showing the behavior of the 3-step operation example 3. FIG. As shown in FIG. 20, in Step 1, the mobile station 200 transmits a connection request signal to the RIS 300/RIS 300 receives the connection request signal from the mobile station 200, and in Step 2, the RIS 300 receives the signal from the mobile station 200. , and in Step 3, the mobile station 200 may transmit the connection information based on the signal received from the RIS 300 . Note that Steps 2 and 3 may be performed multiple times.

Here, the following options may be adopted in each step.

<Step 1: The mobile station transmits a connection request or reconnection request signal (mobile station → RIS)>
At this time, a connection request (origination)/reconnection request may be transmitted. It should be noted that the connection request may be made by the signal transmitted and received when detection/identification is performed, or the connection request may be made by a different signal using the same settings.

Sequences/parameters may be defined or preset in the RIS.
1-1: The mobile station may transmit a signal corresponding to the signal received from the RIS to the mobile station.
1-1a: A signal may be sent to the RIS based on the signal received during detection/identification. The signal transmitted by the mobile station may be a signal for detection/identification.
1-1c: The mobile station may transmit a connection request signal based on the signal received in Step2.

1-2: The mobile station may transmit a predetermined signal independently of the signal transmitted from the RIS. Signal transmission by the mobile station may always be performed at a predetermined period. Sequences/parameters may be defined or preset in the RIS.

<Step 2: The RIS may transmit connection information based on the signal sent from the mobile station>
When a reconnection request is received, the information to be signal controlled/transmitted may differ from that at the time of transmission.
2-1: When the RIS receives the signal sent in Step 1 - Reconnection may be refused to the mobile station when the following conditions are met.
・Poor radio quality (e.g. received SINR is below the threshold)
・RIS does not hold mobile station information ・Security control is not activated between RIS and mobile station

If reconnection is not performed, the following behavior may be performed.
OptionA: Do not make a predetermined response to the mobile station
OptionB: Notify reconnection failure to the relevant mobile station

2-2: When RIS receives the signal sent in Step 3
2-2a: Step 2 may be performed again if the RIS does not receive a signal from the mobile station within a certain period of time. The time at this time may be determined based on a predetermined rule or a signal received from the mobile station.
Example: Send again after Contention resolution timer

2-2b: If it is determined that the connection has failed based on the signal transmitted from the mobile station, Step 2 may be performed again.

<RIS connection determination>
The RIS may determine whether the connection is complete based on the signal.
Example 1: Receive connection completion information from mobile station Example 2: Receive connection information from mobile station, etc.

The RIS may report to the mobile station whether the connection is complete.
Example: Transmit connection completion using HARQ-ACK Example: Do not send a connection failure signal to the mobile station

<Step 3: The mobile station may send connection information based on the signal sent from the RIS>
The mobile station may determine whether the connection is complete based on the signal.
Example 1: Receiving connection completion information from RIS Example 2: Receiving connection information from RIS etc.

The mobile station may report to the RIS whether the connection is complete.
Example: Transmit connection completion using HARQ-ACK Example: Do not send a connection failure signal to the mobile station

When the mobile station fails to receive
2-2a: If the mobile station does not receive a signal from the RIS within a certain period of time, perform Step 1 again/You may instruct the RIS to perform Step 2. The time at this time may be determined based on a predetermined rule or a signal received from the RIS.
Example: Send again after Contention resolution timer

2-2b: If it is determined that the connection has failed based on the signal sent from the RIS, perform Step 1 again/You may instruct the RIS to perform Step 3.

(5.4) Operation example 4
In the operation example 3, the mobile station transmits the first signal related to the connection between the mobile station and the RIS. Conversely, the RIS transmits the first signal related to the connection between the mobile station and RIS. (operation example 4). FIG. 21 is a diagram showing the behavior of one-step operation example 4. FIG. Similarly, steps 2 and 3 can also be implemented by replacing (reading) the RIS and the mobile station in Operation Example 3, so description thereof will be omitted.

(6) Functions and Effects According to the above-described embodiment, the following functions and effects are obtained. That is, the radio relay device (RIS 300) includes a control unit (control unit 330) that controls the relay state when relaying radio waves from radio base stations (radio base stations 100, 150) or terminals (UE 200) without signal interpretation, A transmitting/receiving unit (transmitting/receiving unit 350) that transmits or receives a signal related to synchronization or connection with a radio base station (radio base stations 100, 150) or a terminal (UE 200).

As a result, the radio relay apparatus 300 can accurately synchronize or connect with each other by transmitting/receiving a signal for synchronizing or connecting with the base station 100, the UE 200, or the like. (RIS) or the like can be used for relay.

Also, in the present embodiment, transmission/reception section 350 of radio relay apparatus 300 transmits or receives signals for connection or synchronization with radio base station 100 or terminal 200 .

As a result, signals that can be accurately synchronized or connected to each other can be used to lead to accurate relay operations.

In addition, in the present embodiment, control unit 330 of radio relay device 300 reflects, transmits, aggregates, diffracts, and changes signal power of radio waves from radio base stations or terminals, and controls reception or transmission beams. control at least one of

As a result, the wireless relay device 300 can switch to an appropriate relay state according to the control information and reception state.

In addition, in the present embodiment, the control unit 330 of the radio relay device 300 performs discovery, synchronization, and connection of a radio base station or a terminal, initial connection between the radio base station and the terminal, and communication after connection establishment. , and beam control.

As a result, the wireless relay device 300 can perform various operations related to communication in addition to simply reflecting radio waves.

(9) Other Embodiments Although the contents of the present invention have been described along with the examples, it should be understood that the present invention is not limited to these descriptions and that various modifications and improvements are possible. self-evident to the trader.

For example, in the above-described embodiments, the communication target of the wireless relay device is described as a "base station" or a "mobile station/terminal", but the target is not limited to this and may be any communication device. Further, in the above-described embodiment, the direction from the radio base station to the terminal (downlink) has been mainly described, but as appropriately described in the above-described embodiments, radio signals in the direction from the terminal to the radio base station (uplink) can also be used. may be controlled.

Also, the block configuration diagram (FIG. 3) used to describe the above-described embodiment shows blocks for each function. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device physically or logically coupled, or directly or indirectly using two or more physically or logically separate devices (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. In either case, as described above, the implementation method is not particularly limited.

Furthermore, the UE 200 and the radio relay device 300 described above may function as a computer that performs processing of the radio communication method of the present disclosure. FIG. 22 is a diagram showing an example of the hardware configuration of base station 100, UE 200 and radio relay apparatus 300. As shown in FIG. As shown in FIG. 22, base station 100, UE 200 and radio relay device 300 are configured as computer devices including processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006 and bus 1007. may

In the following explanation, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the device may be configured to include one or more of each device shown in the figure, or may be configured without some of the devices.

Each functional block of the wireless relay device 300 (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

Further, each function or part of the functions in the wireless relay device 300 is performed by the processor 1001 by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and the communication device 1004 performs the calculation. It may be realized by controlling communication or controlling at least one of reading and writing of data in memory 1002 and storage 1003 .

A processor 1001, for example, operates an operating system and controls the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including interfaces with peripheral devices, a control unit, an arithmetic unit, registers, and the like.

Also, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. Further, the various processes described above may be executed by one processor 1001, or may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. may be The memory 1002 may also be called a register, cache, main memory (main storage device), or the like. The memory 1002 can store programs (program code), software modules, etc. capable of executing a method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. Storage 1003 may also be referred to as an auxiliary storage device. The recording medium described above may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.

The communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc., for realizing at least one of frequency division duplex (FDD) and time division duplex (TDD). may consist of

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside. The output device 1006 is an output device (eg, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

In addition, the device includes hardware such as a microprocessor, Digital Signal Processor (DSP), Application Specific Int e.g. rated Circuit (ASIC), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA). part or all of each functional block may be implemented by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

In addition, notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may include physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), other signals, or combinations thereof, and RRC signaling may also be referred to as RRC messages, e.g., RRC Connection Setup ) message, RRC Connection Reconfiguration message, or the like.

Each aspect/embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system ( 5G), Beyond 5G, 6G, Future Radio Access (FRA), New Radio (NR), W-CDMA®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (Registered Trademark)), IEEE 802.16 (WiMAX (Registered Trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (Registered Trademark), or any other suitable system and any extensions based on these It may be applied to at least one of the generation systems. Also, 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 order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

A specific operation that is performed by a base station in the present disclosure may be performed by its upper node in some cases. In a network consisting of one or more network nodes with a base station, various operations performed for communication with a terminal may be performed by the base station and other network nodes other than the base station (e.g. MME or S-GW, etc., but not limited to). Although the case where there is one network node other than the base station is exemplified above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information, signals (information, etc.) can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.

Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input and output information may be overwritten, updated, or appended. The output information may be deleted. The entered information may be transmitted to other devices.

The determination may be made by a value represented by one bit (0 or 1), by a true/false value (Boolean: true or false), or by numerical comparison (for example, a predetermined value).

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, the Software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to access websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. A component carrier (CC) may also be called a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not restrictive names in any respect. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable designation, the various designations assigned to these various channels and information elements are in no way restrictive designations. is not.

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", "cell group", " Terms such as "carrier", "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area corresponding to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head: RRH) can also provide communication services.

The term "cell" or "sector" refers to part or all of the coverage area of at least one of a base station and base station subsystem that provides communication services in this coverage.

In this disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal" may be used interchangeably. .

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and 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 a mobile object, the mobile object itself, or the like. The mobile body may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile body (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.

Also, the base station in the present disclosure may be read as a mobile station (user terminal, hereinafter the same). For example, communication between a base station and a mobile station is replaced with communication between multiple mobile stations (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.) Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the mobile station may have the functions that the base station has. Also, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels.

Similarly, a mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions that the mobile station has. A radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) independent of numerology.

A numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, transmission and reception specific filtering operations performed by the receiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, and/or the like.

A slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a unit of time based on numerology.

A slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, may be a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms may be Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum scheduling time unit in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, codewords, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.

If one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI with a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than a regular TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and so on.

In addition, long TTI (for example, normal TTI, subframe, etc.) may be read as TTI having a time length exceeding 1 ms, and short TTI (for example, shortened TTI, etc.) is less than the TTI length of long TTI and 1 ms. A TTI having a TTI length greater than or equal to this value may be read as a replacement.

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
The number of subcarriers included in an RB may be the same regardless of neurology, and may be 12, for example. The number of subcarriers included in an RB may be determined based on neumerology.

Also, the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long. One TTI, one subframe, etc. may each consist of one or more resource blocks.

In addition, one or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (Sub-Carrier Group: SCG), resource element groups (Resource Element Group: R example:), PRB pairs, RB pairs and so on.

In addition, a resource block may be composed of one or more resource elements (Resource Element: RE). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A Bandwidth Part (BWP) (which may also be called a Bandwidth Part) represents a subset of contiguous common resource blocks (RBs) for a neumerology in a carrier. good. Here, the common RB may be identified by an RB index based on the common reference point of the carrier. 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). One or more BWPs may be configured in one carrier for a UE.

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

The structures such as radio frames, subframes, slots, minislots and symbols described above are only examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.

The terms "connected," "coupled," or any variation thereof mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in this disclosure, two elements are defined using at least one of one or more wires, cables and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions, and the like.

The reference signal can also be abbreviated as Reference Signal (RS), and may also be called Pilot depending on the applicable standard.

The term "based on" as used in this disclosure does not mean "based only on" unless otherwise specified. In other words, the phrase "based on" means both "based only on" and "based at least on."

"Means" in the configuration of each device described above may be replaced with "unit", "circuit", "device", or the like.

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed therein or that the first element must precede the second element in any way.

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

In this disclosure, if articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are plural.

The terms "determining" and "determining" used in this disclosure may encompass a wide variety of actions. "Judgement" and "determination" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as "judged" or "determined", and the like. Also, "judgment" and "determination" are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" are considered to be "judgment" and "decision" by resolving, selecting, choosing, establishing, comparing, etc. can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be practiced with modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not meant to be limiting in any way.

10 Wireless communication system 100,150A～150D Wireless base station 200 UE
300 Radio repeater 301 Relay antenna 303 Variable unit 330 Control unit 350 Transmitter/receiver C Cell OB Obstacle 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims (4)

1. a control unit that controls a relay state when relaying radio waves from a wireless base station or a terminal without signal interpretation;
   a transmission/reception unit that transmits or receives a signal related to synchronization or connection with the radio base station or the terminal;
   A radio repeater.
2. The transmitting/receiving unit
   2. The radio relay apparatus according to claim 1, which transmits or receives said signal for connection or synchronization with said radio base station or said terminal.
3. The control unit
   Controlling the relay state by controlling at least one of reflection, transmission, aggregation, diffraction, signal power change, and reception or transmission beam of radio waves from the radio base station or the terminal. 3. The radio relay device according to claim 1 or 2.
4. a control step for controlling a relay state when relaying radio waves from a radio base station or a terminal without signal interpretation;
   a transmitting/receiving step of transmitting or receiving a signal related to synchronization or connection with the radio base station or the terminal;
   A radio relay method comprising:

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