Method and apparatus for operating beam in wireless communication system — Samsung Electronics Co., Ltd. (US20250150119A1)
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ABSTRACT
Abstract
Disclosed is a method of a base station that supports beamforming in a wireless communication system, the method comprising the steps of: transmitting, to an RC, control information for controlling a plurality of reflective patterns of an RIS; transmitting synchronizing signals corresponding to a plurality of beams of the base station via the RIS to a terminal positioned in a shadow region, wherein the synchronizing signals are sent for each of the plurality of reflective patterns controlled on the basis of the control information; receiving, from the terminal, measurement reports containing measurement results of the intensities of the synchronizing signals corresponding to the plurality of beams of the base station, wherein the measurement reports are received for each of the plurality of reflective patterns; selecting at least one of the plurality of beams and at least one of the plurality of reflective patterns as an optimal beam and an optimal reflective pattern for the shadow region on the basis of the measurement results contained in the measurement reports; and generating a code book for the RIS on the basis of the selected optimal reflective pattern for the shadow region.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
This application is a U.S. National Stage application under 35 U.S.C. § 371 of an International application number PCT/KR2022/014697, filed on Sep. 29, 2022, which is based on and claims the benefit of a Korean application number 10-2021-0129122, filed on Sep. 29, 2021, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.
TECHNICAL FIELD
The disclosure relates to a method and apparatus for managing a beam of a base station in a wireless communication system.
BACKGROUND ART
Wireless communication technologies have been developed mainly for human services, such as voice, multimedia, and data communication. As 5th-generation (5G) communication systems are commercially available, connected devices are expected to explosively increase and to be connected to a communication network. Examples of things connected to a network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices will evolve into various form factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6th-generation (6G) era, efforts are being made to develop an enhanced 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a beyond 5G system.
In the 6G communication system expected to be realized around year 2030, the maximum transmission rate is tera (i.e., 1000 gigabit) bps, and the wireless latency is 100 microseconds (usec). In other words, the transmission rate of the 6G communication system is 50 times faster than that of the 5G communication system, and the wireless latency is reduced to one tenth.
To achieve these high data rates and ultra-low latency, 6G communication systems are considered to be implemented in terahertz bands (e.g., 95 gigahertz (95 GHz) to 3 terahertz (3 THz) bands). As the path loss and atmospheric absorption issues worsen in the terahertz band as compared with millimeter wave (mmWave) introduced in 5G, technology that may guarantee signal reach, that is, coverage, would become more important. As major techniques for ensuring coverage, there need to be developed multi-antenna transmission techniques, such as new waveform, beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, or large-scale antennas, which exhibit better coverage characteristics than radio frequency (RF) devices and orthogonal frequency division multiplexing (OFDM). New technologies, such as a metamaterial-based lens and antennas, high-dimensional spatial multiplexing technology using an orbital angular momentum (OAM), and a reconfigurable intelligent surface (RIS), are being discussed to enhance the coverage of the terahertz band signals.
For 6G communication systems to enhance frequency efficiency and system network for 6G communication systems include full-duplex technology, there are being developed full-duplex technology in which uplink and downlink simultaneously utilize the same frequency resource at the same time, network technology that comprehensively use satellite and high-altitude platform stations (HAPSs), network architecture innovation technology that enables optimization and automation of network operation and supports mobile base stations, dynamic spectrum sharing technology through collision avoidance based on prediction of spectrum usages, artificial intelligence (AI)-based communication technology that uses AI from the stage of designing and internalizes end-to-end AI supporting function to thereby optimize the system, and next-generation distributed computing technology that realizes services that exceed the limitation of the UE computation capability by ultra-high performance communication and mobile edge computing (MEC) or clouds. Further, continuous attempts have been made to reinforce connectivity between device, further optimizing the network, prompting implementation of network entities in software, and increase the openness of wireless communication by the design of a new protocol to be used in 6G communication systems, implementation of a hardware-based security environment, development of a mechanism for safely using data, and development of technology for maintaining privacy.
Such research and development efforts for 6G communication systems would implement the next hyper-connected experience via hyper-connectivity of 6G communication systems which encompass human-thing connections as well as thing-to-thing connections. Specifically, the 6G communication system would be able to provide services, such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica. Further, services, such as remote surgery, industrial automation and emergency response would be provided through the 6G communication system thanks to enhanced security and reliability and would have various applications in medical, auto, or home appliance industries.
Recently, there is a limitation in resolving a shadow area in a cell with a single base station in a high frequency environment such as an mmWave band, etc., and research on a reconfigurable intelligent surface (RIS) has been conducted as a solution for this. In this case, the term Intelligent reflecting surface (IRS) may be used instead of the term RIS.
The RIS may form a reflection pattern by combining the phases and/or amplitudes of respective reflecting elements (REs) included in the RIS and reflect a beam incident on the RIS in a desired direction according to the reflection pattern.
There is a need for a method of selecting an appropriate beam and reflection pattern from among a plurality of beams and a plurality of reflection patterns to eliminate a shadow area in an environment where a base station supports a plurality of beams and an RIS supports a plurality of reflection patterns.
DETAILED DESCRIPTION OF THE INVENTION
Technical Problem
An aspect of the disclosure is to provide a method and apparatus for managing a beam in a wireless communication system.
An aspect of the disclosure is to provide a method and apparatus for efficiently transmitting and receiving signals to and from a terminal in a shadow area through beamforming by a base station in a wireless communication system.
An aspect of the disclosure is to provide a method and apparatus for efficiently performing communication between a base station and a terminal using an RIS in a wireless communication system.
Technical Solution
The disclosure provides a method of a base station supporting beamforming in a wireless communication system, and the method may comprise transmitting control information for controlling a plurality of reflection patterns of an RIS to an RIS controller (RC), transmitting synchronization signals corresponding to a plurality of beams of the base station for each of the plurality of reflection patterns controlled based on the control information to a terminal located at a shadow area via the RIS; receiving a measurement report including a measurement result of measuring strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns from the terminal; selecting at least one beam among the plurality of beams and at least one reflection pattern among the plurality of reflection patterns as an optimal beam and an optimal reflection pattern for the shadow area, based on the measurement result included in the measurement report; and generating a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
In an embodiment, the control information may be transmitted only once for the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled.
In an embodiment, the control information may be transmitted for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which the reflection pattern corresponding to the control information is controlled.
In an embodiment, the measurement result may include, for each of the plurality of reflection patterns, information about at least one reflection pattern and at least one beam, which correspond to a case that strength of a signal among the synchronization signals corresponding to the plurality of beams satisfies a predetermined threshold value or more.
The disclosure provides a base station supporting beamforming in a wireless communication system, and the base station may comprise a transceiver, and a controller configured to, control the transceiver to transmit control information for controlling a plurality of reflection patterns of an RIS to an RC, control the transceiver to transmit synchronization signals corresponding to a plurality of beams of the base station for each of the plurality of reflection patterns controlled based on the control information to a terminal via the RIS, control the transceiver to receive a measurement report including a measurement result of measuring strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns from the terminal, select at least one beam among the plurality of beams and at least one reflection pattern among the plurality of reflection patterns as an optimal beam and an optimal reflection pattern for a shadow area, based on the measurement result included in the measurement report, and generate a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
In an embodiment, the control information may be transmitted only once for the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled.
In an embodiment, the control information may be transmitted for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which t
CROSS-REFERENCE TO RELATED APPLICATION(S)
This application is a U.S. National Stage application under 35 U.S.C. § 371 of an International application number PCT/KR2022/014697, filed on Sep. 29, 2022, which is based on and claims the benefit of a Korean application number 10-2021-0129122, filed on Sep. 29, 2021, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.
TECHNICAL FIELD
The disclosure relates to a method and apparatus for managing a beam of a base station in a wireless communication system.
BACKGROUND ART
Wireless communication technologies have been developed mainly for human services, such as voice, multimedia, and data communication. As 5th-generation (5G) communication systems are commercially available, connected devices are expected to explosively increase and to be connected to a communication network. Examples of things connected to a network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices will evolve into various form factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6th-generation (6G) era, efforts are being made to develop an enhanced 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a beyond 5G system.
In the 6G communication system expected to be realized around year 2030, the maximum transmission rate is tera (i.e., 1000 gigabit) bps, and the wireless latency is 100 microseconds (usec). In other words, the transmission rate of the 6G communication system is 50 times faster than that of the 5G communication system, and the wireless latency is reduced to one tenth.
To achieve these high data rates and ultra-low latency, 6G communication systems are considered to be implemented in terahertz bands (e.g., 95 gigahertz (95 GHz) to 3 terahertz (3 THz) bands). As the path loss and atmospheric absorption issues worsen in the terahertz band as compared with millimeter wave (mmWave) introduced in 5G, technology that may guarantee signal reach, that is, coverage, would become more important. As major techniques for ensuring coverage, there need to be developed multi-antenna transmission techniques, such as new waveform, beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, or large-scale antennas, which exhibit better coverage characteristics than radio frequency (RF) devices and orthogonal frequency division multiplexing (OFDM). New technologies, such as a metamaterial-based lens and antennas, high-dimensional spatial multiplexing technology using an orbital angular momentum (OAM), and a reconfigurable intelligent surface (RIS), are being discussed to enhance the coverage of the terahertz band signals.
For 6G communication systems to enhance frequency efficiency and system network for 6G communication systems include full-duplex technology, there are being developed full-duplex technology in which uplink and downlink simultaneously utilize the same frequency resource at the same time, network technology that comprehensively use satellite and high-altitude platform stations (HAPSs), network architecture innovation technology that enables optimization and automation of network operation and supports mobile base stations, dynamic spectrum sharing technology through collision avoidance based on prediction of spectrum usages, artificial intelligence (AI)-based communication technology that uses AI from the stage of designing and internalizes end-to-end AI supporting function to thereby optimize the system, and next-generation distributed computing technology that realizes services that exceed the limitation of the UE computation capability by ultra-high performance communication and mobile edge computing (MEC) or clouds. Further, continuous attempts have been made to reinforce connectivity between device, further optimizing the network, prompting implementation of network entities in software, and increase the openness of wireless communication by the design of a new protocol to be used in 6G communication systems, implementation of a hardware-based security environment, development of a mechanism for safely using data, and development of technology for maintaining privacy.
Such research and development efforts for 6G communication systems would implement the next hyper-connected experience via hyper-connectivity of 6G communication systems which encompass human-thing connections as well as thing-to-thing connections. Specifically, the 6G communication system would be able to provide services, such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica. Further, services, such as remote surgery, industrial automation and emergency response would be provided through the 6G communication system thanks to enhanced security and reliability and would have various applications in medical, auto, or home appliance industries.
Recently, there is a limitation in resolving a shadow area in a cell with a single base station in a high frequency environment such as an mmWave band, etc., and research on a reconfigurable intelligent surface (RIS) has been conducted as a solution for this. In this case, the term Intelligent reflecting surface (IRS) may be used instead of the term RIS.
The RIS may form a reflection pattern by combining the phases and/or amplitudes of respective reflecting elements (REs) included in the RIS and reflect a beam incident on the RIS in a desired direction according to the reflection pattern.
There is a need for a method of selecting an appropriate beam and reflection pattern from among a plurality of beams and a plurality of reflection patterns to eliminate a shadow area in an environment where a base station supports a plurality of beams and an RIS supports a plurality of reflection patterns.
DETAILED DESCRIPTION OF THE INVENTION
Technical Problem
An aspect of the disclosure is to provide a method and apparatus for managing a beam in a wireless communication system.
An aspect of the disclosure is to provide a method and apparatus for efficiently transmitting and receiving signals to and from a terminal in a shadow area through beamforming by a base station in a wireless communication system.
An aspect of the disclosure is to provide a method and apparatus for efficiently performing communication between a base station and a terminal using an RIS in a wireless communication system.
Technical Solution
The disclosure provides a method of a base station supporting beamforming in a wireless communication system, and the method may comprise transmitting control information for controlling a plurality of reflection patterns of an RIS to an RIS controller (RC), transmitting synchronization signals corresponding to a plurality of beams of the base station for each of the plurality of reflection patterns controlled based on the control information to a terminal located at a shadow area via the RIS; receiving a measurement report including a measurement result of measuring strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns from the terminal; selecting at least one beam among the plurality of beams and at least one reflection pattern among the plurality of reflection patterns as an optimal beam and an optimal reflection pattern for the shadow area, based on the measurement result included in the measurement report; and generating a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
In an embodiment, the control information may be transmitted only once for the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled.
In an embodiment, the control information may be transmitted for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which the reflection pattern corresponding to the control information is controlled.
In an embodiment, the measurement result may include, for each of the plurality of reflection patterns, information about at least one reflection pattern and at least one beam, which correspond to a case that strength of a signal among the synchronization signals corresponding to the plurality of beams satisfies a predetermined threshold value or more.
The disclosure provides a base station supporting beamforming in a wireless communication system, and the base station may comprise a transceiver, and a controller configured to, control the transceiver to transmit control information for controlling a plurality of reflection patterns of an RIS to an RC, control the transceiver to transmit synchronization signals corresponding to a plurality of beams of the base station for each of the plurality of reflection patterns controlled based on the control information to a terminal via the RIS, control the transceiver to receive a measurement report including a measurement result of measuring strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns from the terminal, select at least one beam among the plurality of beams and at least one reflection pattern among the plurality of reflection patterns as an optimal beam and an optimal reflection pattern for a shadow area, based on the measurement result included in the measurement report, and generate a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
In an embodiment, the control information may be transmitted only once for the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled.
In an embodiment, the control information may be transmitted for each of the plurality of reflection patterns.
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information
In an embodiment, the control information may include at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which the reflection pattern corresponding to the control information is controlled.
In an embodiment, the measurement result may include, for each of the plurality of reflection patterns, information about at least one reflection pattern and at least one beam, which correspond to a case that strength of a signal among the synchronization signals corresponding to the plurality of beams satisfies a predetermined threshold value or more.
The disclosure provides a method of a base station supporting beamforming in a wireless communication system, and the method may comprise transmitting control information for controlling at least one reflection pattern among a plurality of reflection patterns of an RIS during a predetermined time interval to an RC; transmitting synchronization signals corresponding to a plurality of beams of the base station for the at least one reflection pattern controlled based on the control information during the predetermined time interval to a terminal located at a shadow area via the RIS; identifying whether the terminal establishes a connection with the base station according to a random access procedure during the predetermined time interval; if the terminal establishes the connection with the base station according to the random access procedure during the predetermined time interval, identifying log information associated with the random access procedure of the terminal; identifying at least one synchronization signal for which the random access procedure is successfully performed among the plurality of synchronization signals from the log information; selecting the at least one reflection pattern and a beam corresponding to the at least one synchronization signal among the plurality of beams as an optimal reflection pattern and an optimal beam for the shadow area, respectively; and generating a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
The disclosure provides a base station supporting beamforming in a wireless communication system, and the base station may comprise a transceiver, and a controller configured to, control the transceiver to transmit control information for controlling at least one reflection pattern among a plurality of reflection patterns of an RIS during a predetermined time interval to an RC, control the transceiver to transmit synchronization signals corresponding to a plurality of beams of the base station for the at least one reflection pattern controlled based on the control information during the predetermined time interval to a terminal located at a shadow area via the RIS, identify whether the terminal establishes a connection with the base station according to a random access procedure during the predetermined time interval, if the terminal establishes the connection with the base station according to the random access procedure during the predetermined time interval, identify log information associated with the random access procedure of the terminal, identify at least one synchronization signal for which the random access procedure is successfully performed among the plurality of synchronization signals from the log information, select the at least one reflection pattern and a beam corresponding to the at least one synchronization signal among the plurality of beams as an optimal reflection pattern and an optimal beam for the shadow area, respectively, and generate a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
The disclosure provides a method of a base station supporting beamforming in a wireless communication system, and the method may comprise obtaining location information for at least one terminal based on location information of a shadow area, obtaining identifier information for the at least one terminal based on the location information for the at least one terminal, identifying whether a connection between the at least one terminal and the base station is released, if the connection between the at least one terminal and the base station is released, transmitting control information for controlling at least one reflection pattern among a plurality of reflection patterns of an RIS during a predetermined time interval to an RC; transmitting synchronization signals corresponding to a plurality of beams of the base station for the at least one reflection pattern controlled based on the control information during the predetermined time interval to the at least one terminal via the RIS; identifying whether the at least one terminal re-establishes a connection with the base station according to a random access procedure during the predetermined time interval based on the identifier information for the at least one terminal; if the at least one terminal re-establishes the connection with the base station according to the random access procedure during the predetermined time interval based on the identifier information for the at least one terminal, identifying log information associated with the random access procedure of the at least one terminal; identifying at least one synchronization signal for which the random access procedure is successfully performed among the plurality of synchronization signals from the log information; selecting the at least one reflection pattern and a beam corresponding to the at least one synchronization signal among the plurality of beams as an optimal reflection pattern and an optimal beam for the shadow area, respectively; and generating a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
The disclosure provides a base station supporting beamforming in a wireless communication system, and the base station may comprise a transceiver, and a controller configured to, obtain location information for at least one terminal based on location information of a shadow area, obtain identifier information for the at least one terminal based on the location information for the at least one terminal, identify whether a connection between the at least one terminal and the base station is released, control the transceiver to transmit control information for controlling at least one reflection pattern among a plurality of reflection patterns of an RIS during a predetermined time interval to an RC if the connection between the at least one terminal and the base station is released, control the transceiver to transmit synchronization signals corresponding to a plurality of beams of the base station for the at least one reflection pattern controlled based on the control information during the predetermined time interval to the at least one terminal via the RIS, identify whether the at least one terminal re-establishes a connection with the base station according to a random access procedure during the predetermined time interval based on the identifier information for the at least one terminal, identify log information associated with the random access procedure of the at least one terminal if the at least one terminal re-establishes the connection with the base station according to the random access procedure during the predetermined time interval based on the identifier information for the at least one terminal, identify at least one synchronization signal for which the random access procedure is successfully performed among the plurality of synchronization signals from the log information, select the at least one reflection pattern and a beam corresponding to the at least one synchronization signal among the plurality of beams as an optimal reflection pattern and an optimal beam for the shadow area, respectively, and generate a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
Advantageous Effects
According to various embodiments of the disclosure, a base station may efficiently communicate with terminals using an RIS.
According to various embodiments of the disclosure, a base station may efficiently communicate with a terminal located at a shadow area via an optimal beam and an optimal reflection pattern.
The effects of the disclosure are not limited to those mentioned above, and other effects not mentioned will be apparent to those skilled in the art from the following description.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a diagram illustrating a time-frequency domain structure in LTE according to various embodiments of the disclosure.
FIG. 2 is a diagram illustrating a downlink control channel in LTE according to various embodiments of the disclosure.
FIG. 3 is a diagram illustrating a transmission resource of a downlink control channel in 5G according to various embodiments of the disclosure.
FIG. 4 is a diagram illustrating an example of configuration for a control region in 5G according to various embodiments of the disclosure.
FIG. 5 is a diagram illustrating an example of configuration for a downlink RB structure in 5G according to various embodiments of the disclosure.
FIG. 6 is a diagram schematically illustrating a structure of a wireless communication system including an RIS according to various embodiments of the disclosure.
FIGS. 7 A, 7 B, and 7 C are diagrams for explaining an operating principle of an RIS according to various embodiments of the disclosure.
FIG. 8 is a diagram for explaining an optimal beam of a base station and an optimal reflection pattern of an RIS for a target shadow area, according to various embodiments of the disclosure.
FIGS. 9 A and 9 B are diagrams for explaining a method of obtaining an optimal beam of a base station and an optimal reflection pattern of an RIS using a measurement result for a base station-synchronization signal in a test terminal according to the first embodiment of the disclosure.
FIGS. 10 A and 10 B are diagrams for explaining a method of transmitting a control signal to an RC by a base station in FIG. 9 according to the first embodiment of the disclosure.
FIG. 11 is a diagram for explaining timing information at which measurement needs to be started to obtain an optimal beam of a base station and an optimal reflection pattern of an RIS in a case that the base station and an RC are connected through in-band according to the first embodiment of the disclosure.
FIG. 12 is a diagram for explaining information about timing at which measurement is started to obtain an optimal beam of a base station and an optimal reflection pattern of an RIS in a case that the base station and an RC are connected through out-band according to the first embodiment of the disclosure.
FIG. 13 is a diagram for explaining timing information at which measurement needs to be started to obtain an optimal beam of a base station and an optimal reflection pattern of an RIS in a case that the base station and an RC are connected via other communication scheme according to the first embodiment of the disclosure.
FIGS. 14 A and 14 B are diagrams for explaining a method for a test terminal to obtain an optimal beam of a base station and an optimal reflection pattern of an RIS by performing a random access procedure with the base station according to the second embodiment of the disclosure.
FIG. 15 is a diagram for explaining a method for a base station to specify a test terminal according to the second embodiment of the disclosure.
FIG. 16 is a diagram for explaining a method for a general terminal to obtain an optimal beam of a base station and an optimal reflection pattern of an RIS by performing a random access procedure with the base station according to the third embodiment of the disclosure.
FIG. 17 is a diagram schematically illustrating an internal structure of a terminal according to an embodiment of the disclosure.
FIG. 18 is a diagram schematically illustrating an internal structure of a base station according to an embodiment of the disclosure.
FIG. 19 is a diagram schematically illustrating an internal structure of an RC according to an embodiment of the disclosure.
MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the disclosure will be described below in detail with reference to the accompanying drawings. It is to be noted that like reference numerals denote the same components in the drawings. Lest it should obscure the subject matter of the disclosure, a detailed description of a generally known function or structure of will be avoided.
In describing embodiments, a description of technical content which is well known in the technical field of the disclosure and not directly related to the disclosure will be avoided, lest it should obscure the subject matter of the disclosure. This is done to make the subject matter of the disclosure clearer without obscuring it by omitting an unnecessary description.
For the same reason, some components are shown as exaggerated, omitted, or schematic in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each drawing, the same reference numerals are assigned to the same or corresponding components.
The advantages and features of the disclosure and a method of achieving them will become apparent from reference to embodiments described below in detail in conjunction with the attached drawings. However, the disclosure may be implemented in various manners, not limited to the embodiments set forth herein. Rather, these embodiments are provided such that the disclosure is complete and thorough and its scope is fully conveyed to those skilled in the art, and the disclosure is only defined by the appended claims. The same reference numerals denote the same components throughout the specification.
It will be understood that each block of the flowchart illustrations and combinations of the flowchart illustrations can be implemented by computer program instructions. These computer program instructions may be loaded on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions, which are executed through the processor of the computer or other programmable data processing equipment, create means for implementing the functions specified in the flowchart block(s). These computer program instructions may also be stored in a computer-usable or computer-readable memory that can direct the computer or other programmable data processing equipment to function in a particular manner, such that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block(s). The computer program instructions may also be loaded onto the computer or other programmable data processing equipment to cause a series of operations to be performed on the computer or other programmable data processing equipment to produce a computer implemented process such that the instructions which are executed on the computer or other programmable equipment provide operations for implementing the functions specified in the flowchart block(s).
Furthermore, the respective block diagrams may illustrate parts of modules, segments, or codes including one or more executable instructions for performing specific logic function(s). Moreover, it should be noted that the functions of the blocks may be performed in a different order in several alternative implementations. For example, two successive blocks may be performed substantially at the same time, or may be performed in reverse order according to their functions.
The term âunitâ as used herein means, but is not limited to, a software or hardware component, such as a field programmable gate array (FPGA) or application specific integrated circuit (ASIC), which performs certain tasks. A âunitâ may be configured to reside on an addressable storage medium and configured to be executed on one or more processors. Thus, a âunitâ may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functionality provided in the components and âunitsâ may be combined into fewer components and âunitsâ or further separated into additional components and âunitsâ. In addition, the components and âunitsâ may be implemented such that they are executed on one or more CPUs in a device or a secure multimedia card.
In embodiments of the disclosure, a base station, which is an entity to allocate resources to a terminal, may be at least one of a gNode B, a gNB, an eNode B, an eNB, a Node B, a BS, a radio access unit, a base station controller, or a network node. Further, the base station may be a network entity including at least one of an integrated access and backhaul (IAB)-donor that is a gNB providing network access to terminal(s) through a network of backhaul and access links or an IAB-node that is a radio access network (RAN) node supporting NR access link(s) to terminal(s) and supporting NR backhaul links to the IAB-donor or another IAB-node in an NR system. A terminal may be wirelessly coupled to an IAB-donor through an IAB-node and transmit and receive data to and from the IAB-donor coupled to at least one IAB-node through a backhaul link.
Further, the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or various devices capable of executing a communication function. In the disclosure, downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) is a wireless transmission path of a signal transmitted from a terminal to a base station. While an LTE or LTE-A system may be described below as an example, embodiments of the disclosure are applicable to other communication systems having a similar technical background or channel structure. For example, the communication systems may include 5th generation (5G) new radio (5G NR) developed after LTE-A, and 5G may be a concept encompassing legacy LTE, LTE-A, and other similar services in the following description. Further, the disclosure is also applicable to other communication systems through some modifications without greatly departing from the scope of the disclosure as judged by those skilled in the art.
As used in the following description, terms referring to signals, terms referring to channels, terms referring to control information, terms referring to network entities, terms referring to components of a device, and the like are exemplified for ease of description. In addition, as used in the following description, terms used to identify nodes, terms referring to messages, terms referring to interfaces between network entities, terms referring to various pieces of information, and so on are exemplified for ease of description. Therefore, the disclosure is not limited to the terms described herein, and other terms having equivalent technical meanings may be used.
In addition, although the disclosure describes various embodiments using terminology used in some communication standards (e.g., 3rd Generation Partnership Project (3GPP)), this is for illustrative purposes only. Various embodiments of the disclosure may be readily adapted and applied to other communication systems.
FIG. 1 is a diagram illustrating a time-frequency domain structure in an LTE system according to various embodiments of the disclosure.
Referring to FIG. 1 , a horizontal axis represents a time domain, and a vertical axis represents a frequency domain.
A minimum transmission unit in the time domain is an OFDM symbol, N symb OFDM symbols 101 form one slot 102 , and two slots form one subframe 103 . The length of a slot is 0.5 ms, and the length of a subframe is 1.0 ms. A radio frame 104 is a time-domain unit including 10 subframes. A minimum transmission unit in the frequency domain is a subcarrier, and a total system bandwidth includes N SC BW subcarriers 105 . A basic resource unit in the time-frequency domain is a Resource Element (RE) 106 , which may be represented by an OFDM symbol index and a subcarrier index. A Resource Block (RB) (or a Physical Resource Block (PRB)) 107 is defined as N symb consecutive OFDM symbols 101 in the time domain by N SC RB consecutive subcarriers 108 in the frequency domain. Thus, one RB 108 includes N symb ÃN SC RB REs 106 . Generally, a minimum data transmission unit is in RBs. In the LTE system, typically N symb =7 and N SC RB =12 where N
SC BW 105 and N
SC RB 108 are proportional to the bandwidth of a system transmission band.
Downlink control information (DCI) in LTE and LTE-Advanced (LTE-A) systems will be described below in detail.
In the LTE system, scheduling information for DL data or UL data is transmitted in DCI from a base station to a terminal. Several DCI formats are defined and operated by applying the defined DCI formats depending on whether scheduling information is for UL data or DL data, whether DCI is compact DCI with a small size of control information, whether spatial multiplexing using multiple antennas is applied, whether DCI is for power control, and so on. For example, DCI format 1, which is scheduling control information for DL data, is configured to include at least the following control information.
Resource allocation type 0/1 flag: Indicates whether the resource allocation scheme is type 0 or type 1. Type 0 applies a bitmap scheme to allocate resources on a resource block group (RBG) basis. In the LTE system, a basic scheduling unit is a resource block (RB) represented by time and frequency-domain resources, and an RBG includes a plurality of RBs, which is a basic scheduling unit in type 0. Type 1 allows for allocation of a specific RB in an RBG. Resource block assignment: Indicates an RB assigned for data transmission. Represented resources are determined according to a system bandwidth and a resource allocation scheme. Modulation and Coding Scheme (MCS): Indicates a modulation scheme used for data transmission and the size of a transport block, which is data to be transmitted. HARQ process number: Indicates the number of an HARQ process. New data indicator: Indicates an HARQ initial transmission or an HARQ retransmission. Redundancy version: Indicates an HARQ redundancy version. Transmit Power Control (TPC) command for Physical Uplink Control CHannel (PUCCH): Indicates a TPC command for a UL control channel, PUCCH.
The DCI is transmitted through a physical control channel, physical downlink control channel (PDCCH) after channel coding and modulation.
DCI message payload is attached with a Cyclic Redundancy Check (CRC), which is scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of a terminal. Different RNTIs are used depending on the purposes of DCI messages, for example, terminal-specific (UE-specific) data transmission, a power control command, or a random access response. That is, the RNTI is not transmitted explicitly but is included in CRC calculation. When receiving a DCI message transmitted on a PDCCH, the terminal may identify a CRC using an assigned RNTI, and when a CRC check result is correct, know that the message is directed to the terminal.
FIG. 2 is a diagram illustrating a DL control channel in LTE according to various embodiments of the disclosure. The DL control channel in LTE may be, for example, a PDCCH 201 .
Referring to FIG. 2 , the PDCCH 201 is time-multiplexed with a data transmission channel, Physical Downlink Shared CHannel (PDSCH) 202 and transmitted across a total system bandwidth. A region of the PDCCH 201 is represented as the number of OFDM symbols and indicated to a terminal by a Control Format Indicator (CFI) transmitted on a Physical Control Format Indicator CHannel (PCFICH). As the PDCCH 201 is assigned to starting OFDM symbols of a subframe, it has the advantage of allowing the terminal to decode a DL scheduling assignment as soon as possible, thereby reducing the decoding delay of a DownLink Shared CHannel (DL-SCH), that is, an overall DL transmission delay. Since one PDCCH carries one DCI message and multiple terminals may be scheduled simultaneously on DL and UL, multiple PDCCHs may be transmitted simultaneously within each cell. A cell-specific reference signal (CRS) 203 is used as a reference signal (RS) for decoding the PDCCH 201 . The CRS 203 is transmitted across the total band in every subframe and subject to different scrambling and resource mapping depending on a cell identity (ID). Since the CRS 203 is an RS common to all terminals, terminal-specific beamforming may not be used. Therefore, a multi-antenna transmission scheme for the PDCCH in LTE is limited to open-loop transmit diversity. The number of ports for the CRS 203 is implicitly known to the terminal from decoding of a Physical Broadcast CHannel (PBCH).
Resource allocation for the PDCCH 201 is based on a Control-Channel Element (CCE), and one CCE includes 9 Resource Element Groups (REGs), that is, a total of 36 Resource Elements (REs). The number of CCEs required for a specific PDCCH 201 may be 1, 2, 4, or 8, depending on the channel coding rate of DCI message payload. These different numbers of CCEs are used to implement link adaptation of the PDCCH 201 . Since the terminal has to detect the signal without knowing information about the PDCCH 201 , a search space representing a set of CCEs for blind decoding is defined in LTE. The search space includes a plurality of sets for each aggregation level (AL) of CCEs, which is not explicitly signaled but is implicitly defined by a function of the terminal identity and a subframe number. In each subframe, the terminal decodes the PDCCH 201 for every possible resource candidate that may be produced from CCEs within a configured search space, and processes information declared valid for the terminal by a CRC check.
Search spaces are categorized into a terminal-specific search space and a common search space. A certain group of terminals or all terminals may monitor the search space of the PDCCH 201 to receive cell-common control information such as dynamic scheduling of system information or a paging message. For example, scheduling allocation information for a DL-SCH for transmission of System Information Block (SIB)- 1 including cell operator information may be received by monitoring a common search space of the PDCCH 201 .
In LTE, an entire PDCCH region includes a set of CCEs in a logical area, and there exists a search space including a set of CCEs. The search space is divided into a common search space and a terminal-specific search space, and the search space of the LTE PDCCH is defined as follows in the 3GPP communication standard specification TS 38.213.
The set of PDCCH candidates to monitor are defined in terms of search
spaces, where a search space S k (L) at aggregation level L â {1,2,4,8} is
defined by a set of PDCCH candidates. For each serving cell on which
PDCCH is monitored, the CCEs corresponding to PDCCH candidate m of
the search space S k (L) are given by
âââââL {(Y k + mâ²)modâN CCE,k / Lâ}+ i
where Y k is defined below, i = 0,..., L â 1 . For the common search space
mâ² = m . For the PDCCH UE specific search space, for the serving cell on
which PDCCH is monitored, if the monitoring UE is configured with
carrier indicator field then mⲠ= m + M (L) ·n CI where n CI is the
carrier indicator field value, else if the monitoring UE is not configured
with carrier indicator field then mâ² = m , where m = 0,...,M (L) â 1.
M (L) is the number of PDCCH candidates to monitor in the given search
space.
Note that the carrier indicator field value is the same as ServCellIndex
For the common search spaces, Y k is set to 0 for the two aggregation
levels L = 4 and L = 8 .
For the UE-specific search space S k (L) at aggregation level L , the variable
Y k is defined by
âââââY k =(A·Y k 1 )mod D
where Y â1 = n RNTI â 0 , A = 39827, D = 65537 and k = ân s /2â , n s
is the slot number within a radio frame.
The RNTI value used for n RNTI is defined in subclause 7.1 in downlink
and subclause 8 in uplink.
CLAIMS
Claims ( 22 )
1 . A method of a base station supporting beamforming in a wireless communication system, the method comprising:
transmitting control information for controlling a plurality of reflection patterns of a reconfiguration intelligent surface (RIS) to an RIS controller (RC); transmitting synchronization signals corresponding to a plurality of beams of the base station for each of the plurality of reflection patterns controlled based on the control information to a terminal located in a shadow area via the RIS; receiving a measurement report including a measurement result of measuring strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns from the terminal; selecting at least one beam among the plurality of beams and at least one reflection pattern among the plurality of reflection patterns as an optimal beam and an optimal reflection pattern for the shadow area, based on the measurement result included in the measurement report; and generating a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
2 . The method of claim 1 , wherein the control information is transmitted once for the plurality of reflection patterns.
3 . The method of claim 2 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
4 . The method of claim 2 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled.
5 . The method of claim 1 , wherein the control information is transmitted for each of the plurality of reflection patterns.
6 . The method of claim 5 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information.
7 . The method of claim 5 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which the reflection pattern corresponding to the control information is controlled.
8 . The method of claim 1 , wherein the measurement result includes, for each of the plurality of reflection patterns, information about at least one reflection pattern and at least one beam, which correspond to a case that strength of a signal among the synchronization signals corresponding to the plurality of beams satisfies a predetermined threshold value or more.
9 . A base station supporting beamforming in a wireless communication system, the base station comprising:
a transceiver; and a controller configured to:
control the transceiver to transmit control information for controlling a plurality of reflection patterns of a reconfiguration intelligent surface (RIS) to an RIS controller (RC),
control the transceiver to transmit synchronization signals corresponding to a plurality of beams of the base station for each of the plurality of reflection patterns controlled based on the control information to a terminal located in a shadow area via the RIS,
control the transceiver to receive a measurement report including a measurement result of measuring strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns from the terminal,
select at least one beam among the plurality of beams and at least one reflection pattern among the plurality of reflection patterns as an optimal beam and an optimal reflection pattern for the shadow area, based on the measurement result included in the measurement report, and
generate a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
10 . The base station of claim 9 , wherein the control information is transmitted once for the plurality of reflection patterns.
11 . (canceled)
12 . A base station supporting beamforming in a wireless communication system, the base station comprising:
a transceiver; and a controller configured to:
control the transceiver to transmit control information for controlling at least one reflection pattern among a plurality of reflection patterns of a reconfiguration intelligent surface (RIS) during a predetermined time interval to an RIS controller (RC),
control the transceiver to transmit synchronization signals corresponding to a plurality of beams of the base station for the at least one reflection pattern controlled based on the control information during the predetermined time interval to a terminal located at a shadow area via the RIS,
identify whether the terminal establishes a connection with the base station according to a random access procedure during the predetermined time interval,
if the terminal establishes the connection with the base station according to the random access procedure during the predetermined time interval, identify log information associated with the random access procedure of the terminal,
identify at least one synchronization signal for which the random access procedure is successfully performed among the plurality of synchronization signals from the log information,
select the at least one reflection pattern and a beam corresponding to the at least one synchronization signal among the plurality of beams as an optimal reflection pattern and an optimal beam for the shadow area, respectively, and
generate a codebook for the RIS based on the selected optimal reflection pattern for the shadow area.
13 .- 14 . (canceled)
15 . The base station of claim 10 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
16 . The base station of claim 10 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled.
17 . The base station of claim 9 , wherein the control information is transmitted for each of the plurality of reflection patterns.
18 . The base station of claim 17 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information.
19 . The base station of claim 17 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which the reflection pattern corresponding to the control information is controlled.
20 . The base station of claim 9 , wherein the measurement result includes, for each of the plurality of reflection patterns, information about at least one reflection pattern and at least one beam, which correspond to a case that strength of a signal among the synchronization signals corresponding to the plurality of beams satisfies a predetermined threshold value or more.
21 . The base station of claim 12 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and order information indicating an order in which the plurality of reflection patterns are controlled, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for each of the plurality of reflection patterns.
22 . The base station of claim 12 , wherein the control information includes at least one of timing information indicating a time point at which the terminal measures strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, information about a transmission period of the synchronization signals corresponding to the plurality of beams, and information indicating a number of times the transmission period of the synchronization signals is repeated for the reflection pattern corresponding to the control information.
23 . The base station of claim 12 ,
wherein the control information includes at least one of timing information indicating a time point at which the terminal measures strength of the synchronization signals corresponding to the plurality of beams of the base station for each of the plurality of reflection patterns, indication information indicating each of the plurality of reflection patterns and information indicating an order in which the plurality of reflection patterns are controlled, and information indicating time at which each of the plurality of reflection patterns is controlled, or wherein the control information includes at least one of timing information indicating a time point at which the terminal measures the strength of the synchronization signals corresponding to the plurality of beams of the base station for a reflection pattern corresponding to the control information, indication information indicating the reflection pattern corresponding to the control information among the plurality of reflection patterns, and information indicating a time at which the reflection pattern corresponding to the control information is controlled.
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