Method and device for sharing frequency resources between mobile communication providers in a wireless communication system

Abstract

The present invention relates to a communication method and system for converging a fifth generation (5G) communication system or a sixth generation (6G) communication system to support a higher data rate than a fourth generation (4G) system. A method for communicating with a user equipment by using a frequency resource of a second mobile communication provider in a mobile communication system is provided, the method being performed by a first base station of a first mobile communication provider. The method includes requesting permission for the first base station to use a second frequency resource of the second mobile communication provider, sending setting information to the user equipment through the first frequency resource of the first mobile communication provider for establishing communication using the second frequency resource of the second mobile communication provider, and communicating with the user equipment through the second frequency resource.

Description

Technical Field

[0001] The present invention relates to a communication method and system for converging a fifth generation (5G) communication system or a sixth generation (6G) communication system to support a higher data rate than a fourth generation (4G) system.

[0002] The present invention relates to a method and device for a mobile communication provider to communicate with a user equipment by sharing the frequency resources of another mobile communication provider in a wireless communication system. Background Art

[0003] Considering the development of mobile communications from generation to generation, technologies for services mainly targeting people, such as voice calls, multimedia services, and data services, have been developed. After the commercialization of 5G (fifth generation) communication systems, the number of connected devices is expected to grow exponentially. Devices will be increasingly connected to communication networks. Examples of connected things can include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to develop in various forms, such as augmented reality glasses, virtual reality headsets, and holographic devices. In order to be able to connect tens of billions of devices and things in the 6G (6th generation) era to provide various services, efforts have been made to develop improved 6G communication systems. The 6G communication system is also called the Beyond-5G system for these reasons.

[0004] The 6G communication system, which is expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga) level bit rate and a radio latency of less than 100 μs, and will therefore be 50 times faster than the 5G communication system and have 1 / 10 of its radio latency.

[0005] In order to achieve such high data rates and ultra-low latency, it has been considered to implement 6G communication systems in the terahertz band (e.g., 95GHz to 3THz band). It is expected that more serious path loss and atmospheric absorption will be introduced in the terahertz band than in the millimeter wave band of 5G, so the technology that can ensure the signal transmission distance (i.e., coverage) will become more critical. As the main technology for ensuring coverage, it is necessary to develop multi-antenna transmission technology, including radio frequency (RF) elements, antennas, new waveforms with better coverage than OFDM, beamforming and massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas and massive antennas. In addition, new technologies for improving terahertz band signal coverage, such as metamaterial lenses and antennas, orbital angular momentum (OAM) and reconfigurable smart surfaces (RIS), are being discussed.

[0006] In addition, in order to improve spectrum efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology, which enables the uplink (UE transmission) and downlink (Node B transmission) to use the same frequency resources at the same time; network technology, which makes comprehensive use of satellites, high altitude platform stations (HAPS), etc.; improved network structure, which is used to support mobile node B, etc. and realize network operation optimization and automation, etc.; use of AI in wireless communications, by considering AI from the early stages of developing 6G technology and internalizing end-to-end AI support functions to improve the entire network operation; and next-generation distributed computing technology, which is used to overcome the limitations of UE computing power through ultra-high performance communication and computing resources (MEC, cloud, etc.) accessible on the network.

[0007] It is expected that such research and development of 6G communication systems will bring the next generation of hyper-connected experiences to every corner of life. In particular, it is expected that services such as true immersive XR, high-fidelity mobile holograms, and digital replicas will be provided through 6G communication systems.

[0008] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Summary of the invention

[0009] Technical Solution

[0010] An aspect of the present disclosure is to solve at least the above problems and / or disadvantages and to provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a method for communicating with a user equipment (UE) by using frequency resources of a second mobile communication provider in a wireless communication system, the method being performed by a first base station of a first mobile communication provider.

[0011] Another aspect of the present disclosure is to provide a method of identifying a mobile communication provider through identification information of the mobile communication provider, the identification information being included in synchronization information of a base station.

[0012] Another aspect of the present disclosure is to provide a method for obtaining synchronization information of a first mobile communication provider from a second frequency resource of a second mobile communication provider, the method being performed by a UE.

[0013] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0015] Figure 1 is a diagram showing a basic structure of a time-frequency domain of a Long Term Evolution (LTE) system according to an embodiment of the present disclosure, wherein the time-frequency domain transmits a radio resource domain of data or control information;

[0016] Figure 2 is a diagram illustrating a physical downlink control channel (PDCCH), which is a downlink physical channel in which downlink channel information (DCI) of LTE is transmitted according to an embodiment of the present disclosure;

[0017] Figure 3 is a diagram showing basic units of time and frequency resources constituting an available downlink control channel in a 5G or 6G communication system according to an embodiment of the present disclosure;

[0018] Figure 4 is a diagram showing a control region (i.e., a control resource set CORESET) in a 5G or 6G wireless communication system in which a downlink control channel is transmitted according to an embodiment of the present disclosure;

[0019] Figure 5 A case where a user equipment (UE) according to an embodiment of the present disclosure is configured to use 14 orthogonal frequency division multiplexing (OFDM) symbols as one time slot (or subframe) in a downlink, a PDCCH is sent in two initial OFDM symbols, and a demodulation reference signal (DMRS) is sent in the third symbol;

[0020] Figure 6 is a diagram showing a concept of a method for communicating with a UE by using frequency resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a first base station of a first mobile communication provider;

[0021] Figure 7 is a flowchart of a method for communicating with a UE by using frequency resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a first base station of a first mobile communication provider;

[0022] Figure 8 is a diagram showing a synchronization signal according to an embodiment of the present disclosure;

[0023] Fig. 9 is a diagram illustrating a synchronization signal including identification information of a mobile communication provider according to an embodiment of the present disclosure;

[0024] Fig.10 is a diagram illustrating a method for transmitting synchronization information by using a non-periodic preamble according to an embodiment of the present disclosure, the method being performed by a base station;

[0025] Fig.11is a diagram showing a method of allocating resources to a first base station of a first mobile communication provider so as to communicate with a UE by using a second frequency of a second mobile communication provider according to an embodiment of the present disclosure;

[0026] Fig.12 is a diagram illustrating a method for communicating with a UE by using resources preferred by a first base station of a first mobile communication provider among resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by the first base station;

[0027] Fig.13 is a diagram illustrating a method for communicating with a UE by using resources determined by a first base station of a first mobile communication provider among resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by the first base station;

[0028] Fig.14 is a diagram showing a method performed by a first base station according to an embodiment of the present disclosure for indicating a resource region to be monitored by a UE for receiving a synchronization signal;

[0029] Fig.15 is a flowchart of a method for synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider by means of a first synchronization signal transmitted in a first frequency resource of a first mobile communication provider according to an embodiment of the present disclosure;

[0030] Fig.16 is a diagram illustrating a method for synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider through a first synchronization signal transmitted in a first frequency resource of a first mobile communication provider according to an embodiment of the present disclosure;

[0031] Fig.17 is a diagram illustrating a method for synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider through a second synchronization signal transmitted from a second base station according to an embodiment of the present disclosure;

[0032] Fig.18 is a diagram illustrating a method of synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider through a second synchronization signal transmitted from the second mobile communication provider according to an embodiment of the present disclosure;

[0033] Fig.19 is a flowchart of a method for indicating an area in which a UE performs rate matching according to an embodiment of the present disclosure, the method being performed by a first base station;

[0034] Fig. 20 is a diagram illustrating a method for performing rate matching by a UE according to an embodiment of the present disclosure;

[0035] Fig.21 is a diagram illustrating a method for sharing frequency resources of a first base station with a third base station according to an embodiment of the present disclosure, the method being performed by the first base station;

[0036] Fig. 22 is a flowchart of a method for communicating with a first base station of a first mobile communication provider by using frequency resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a UE;

[0037] Fig.23 is a diagram illustrating a method of storing synchronization information of a target base station by identifying identification information of a mobile communication provider included in the synchronization information according to an embodiment of the present disclosure;

[0038] Fig.24 is a block diagram showing a configuration of a base station according to an embodiment of the present disclosure; and

[0039] Fig.25 is a block diagram showing the configuration of a UE according to an embodiment of the present invention.

[0040] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0041] According to an embodiment of the present disclosure, a method for communicating with a user equipment through a frequency resource of a second mobile communication provider in a mobile communication system is provided. The method performed by a first base station of a first mobile communication provider includes requesting permission for the first base station to use a second frequency resource of a second mobile communication provider, sending setting information for establishing communication using the second frequency resource of the second mobile communication provider to the user equipment through the first frequency resource of the first mobile communication provider, and communicating with the user equipment through the second frequency resource based on the setting information.

[0042] In an embodiment of the present disclosure, the method may further include receiving a response to the permission request, and the sending of the setting information may include sending the setting information based on the received response.

[0043] In an embodiment of the present disclosure, the method may further include determining that the request is allowed unless a negative acknowledgement (NACK) regarding the permission request is received.

[0044] In an embodiment of the present disclosure, the setting information may include information about a method for the user equipment to obtain synchronization information corresponding to the first base station, and the synchronization information may be obtained through at least one of a periodic synchronization signal or a non-periodic preamble code, and include identification information of the first mobile communication provider.

[0045] In an embodiment of the present disclosure, identification information may be uniquely determined in advance for a first mobile communication provider to distinguish between multiple mobile communication providers, or identification information may be assigned to a first base station from a second base station of a second mobile communication provider, and the method may further include sending the identification information of the first mobile communication provider to a user device.

[0046] In an embodiment of the present disclosure, the method may further include: requesting a second base station of a second mobile communication provider to allocate time and frequency resources to the first base station, communicating with the user equipment by using the second frequency resources; receiving the allocation of time and frequency resources from the second base station; and sending a periodic synchronization signal or a non-periodic preamble to the user equipment by using the allocated time and frequency resources. The communication with the user equipment may include communicating with the user equipment based on synchronization information included in the periodic synchronization signal or the non-periodic preamble.

[0047] In an embodiment of the present disclosure, the setting information may include information about a method for a user device to obtain synchronization information corresponding to a first base station, and the synchronization information may be obtained based on a first synchronization signal sent via a first frequency resource or a second synchronization signal sent via a second frequency resource, wherein the first synchronization signal corresponds to the first base station and the second base station corresponds to a second base station of a second mobile communication provider.

[0048] In an embodiment of the present disclosure, the information about the method of obtaining synchronization information may include information about an offset between the first or second synchronization signal and the synchronization information used to enable the user equipment to communicate with the first base station through the second frequency resource.

[0049] In an embodiment of the present disclosure, the method may further include: obtaining information of a second synchronization signal corresponding to a second base station of a second mobile communication provider; determining, based on the information related to the second synchronization signal, an area where rate matching is to be performed when the user equipment receives data from the first base station; and sending information related to the area where rate matching is to be performed to the user equipment, and the information related to the second synchronization signal may include information about the transmission timing of the second synchronization signal and information about the transmission period of the second synchronization signal.

[0050] In an embodiment of the present disclosure, the method may further include receiving a request from a third base station of a third mobile communication provider for permission to use the first frequency resources of the first mobile communication provider, and determining whether to allow the third base station to use the first frequency resources based on the request from the third base station.

[0051] According to another embodiment of the present disclosure, a method for communicating with a first base station of a first mobile communication provider by using frequency resources of a second mobile communication provider in a wireless communication system is provided, the method being performed by a user device, and the method comprising receiving setting information for establishing communication using second frequency resources of a second mobile communication provider through the first frequency resources of the first mobile communication provider, obtaining synchronization information corresponding to the first base station based on the received setting information, and communicating with the first base station through the second frequency resources based on the obtained synchronization information, wherein the setting information includes information about a method for obtaining the synchronization information, and the synchronization information includes identification information of the first mobile communication provider.

[0052] According to another aspect of the present disclosure, a first base station of a first mobile communication provider is provided, which communicates with a user equipment by using a frequency resource of a second mobile communication provider in wireless communication. The first base station includes a transceiver, a memory, and at least one processor, and the at least one processor is configured to control a request for permission for the first base station to use a second frequency resource of the second mobile communication provider, send setting information for establishing communication through the second frequency resource of the second mobile communication provider to the user equipment by using the first frequency resource of the first mobile communication provider, and communicate with the user equipment through the second frequency resource based on the setting information.

[0053] According to another aspect of the present disclosure, a user equipment for communicating with a first base station of a first mobile communication provider by using a frequency resource of a second mobile communication provider in a wireless communication system is provided. The UE includes a transceiver, a memory, and at least one processor, and the at least one processor is configured to receive setting information for establishing communication using the second frequency resource of the second mobile communication provider through the first frequency resource of the first mobile communication provider, obtain synchronization information corresponding to the first base station based on the received setting information, and communicate with the first base station through the second frequency resource based on the obtained synchronization information. Wherein, the setting information includes information about a method for obtaining the synchronization information, and the synchronization information includes identification information of the first mobile communication provider.

[0054] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure.

[0055] Invention Mode

[0056] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present invention as defined by the claims and their equivalents. The embodiments include various specific details to assist in understanding, but these are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and structures may be omitted for clarity and brevity.

[0057] The terms and words used in the following description and claims are not limited to the bibliographic meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be clear to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for limiting the disclosure defined by the attached claims and their equivalents.

[0058] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0059] When describing the embodiments of the present disclosure herein, descriptions of technologies that are well known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure will be omitted. This is to convey the main points of the present disclosure more clearly by omitting unnecessary descriptions.

[0060] For the same reason, some components are enlarged, omitted or schematically shown in the drawings. The size of each component does not fully reflect its actual size. In each of the drawings, the same reference numerals are assigned to the same or corresponding elements.

[0061] The advantages and features of the present disclosure and the methods for realizing them will become apparent from the embodiments of the present disclosure described below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the following embodiments and can be implemented in many different forms. On the contrary, these embodiments are provided so that the present disclosure will be thorough and complete, and the concepts of the present disclosure will be fully conveyed to those of ordinary skill in the art. The present disclosure should be limited by the scope of the claims. Throughout the specification, the same reference numerals represent the same components.

[0062] In this case, it will be understood that the various blocks and combinations of the flowcharts can be executed by computer program instructions. The computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the device for performing the functions described in the boxes of the various flowcharts can be generated by instructions executed by the processor of the computer or other programmable data processing device. The computer program instructions can be stored in a computer-usable or readable memory for a computer or other programmable data processing device to implement the functions in a particular manner. Therefore, the product including the instruction device for performing the functions described in the blocks (or multiple blocks) of the various flowcharts can be generated by instructions stored in a computer-usable or readable memory. Because the computer program instructions can be stored in a computer or other programmable data processing device, a process executable by a computer can be generated by executing a series of instructions for operations in a computer or other programmable data processing device, thereby generating a computer programmable instruction for operating a computer or other data processing device, thereby providing the functions of the blocks of the various flowcharts.

[0063] In addition, each block can represent a code module, segment or part including one or more executable instructions for performing a specified logical function. It should be noted that in some alternative embodiments, the functions described in the block can be performed in an order different from that described herein. For example, in some cases, two blocks shown in succession can be performed substantially simultaneously, or in a reverse order according to the function corresponding thereto.

[0064] In this case, the term "unit" used in the embodiments set forth herein refers to a software or hardware component that performs certain functions, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, the term "unit" is not limited to software or hardware. The term "unit" can be configured to be stored in an addressable storage medium or reproduce one or more processors. Therefore, the term "unit" can include, for example, components, such as software components, object-oriented software components, class components, and task components, processes, functions, attributes, processes, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, and parameters. The components and functions provided in the "unit" can be combined into a smaller number of components and "units", or can be divided into subcomponents and "subunits". In addition, components and "units" can be implemented as one or more CPUs in an execution device or a secure multimedia card. In an embodiment of the present disclosure, a "unit" can include one or more processors.

[0065] As used herein, terms used to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various types of identification information, etc. are examples provided for ease of explanation. Therefore, the present disclosure is not limited to the terms described below, and other terms indicating objects with equivalent technical meanings may be used.

[0066] In the following, the term "base station" may refer to a subject that allocates resources to a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node in a network. Examples of terminals may include user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In addition, the term "terminal" may refer to other wireless communication devices as well as cellular phones, NB-IoT devices, and sensors. The terms "base station" and "terminal" are not limited to the above examples.

[0067] For ease of description, the following disclosure will use terms and names defined in the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) and / or 3GPP New Radio (NR). However, the present disclosure is not limited to these terms and names and is also applicable to systems conforming to other standards.

[0068] Throughout the disclosure, the expression "at least one of a, b, or c" means only a, only b, only c, both a and b, both a and c, both b and c, a, b, and c, or variations thereof.

[0069] Examples of the terminal may include UE, a mobile station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0070] In this disclosure, a controller may also be referred to as a processor.

[0071] In this disclosure, a layer (or a layer device) may also be referred to as an entity.

[0072] A future communication system after LTE, i.e., a 5G or 6G communication system, should be able to freely reflect various demands from users, service providers, etc., and should therefore simultaneously support services that meet various demands. Examples of services that may be considered for a 5G or 6G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), ultra-reliable low latency communication (URLLC), and the like.

[0073] According to an embodiment of the present disclosure, eMBB may be intended to provide a data transmission rate that is further than the data transmission rate supported by the existing LTE, LTE-A or LTE-Pro. For example, in a 5G or 6G communication system, eMBB should be able to provide a peak data rate of 20Gbps in the downlink and a peak data rate of 10Gbps in the uplink based on one base station. In addition, a 5G or 6G communication system should not only provide a peak data rate, but also provide an actual increased user-perceived data rate of the UE. In order to meet this requirement, various transmission / reception technologies may need to be improved in a 5G or 6G communication system, including more advanced multiple-input multiple-output (MIMO) transmission technology. In the 2GHz band used by the current LTE system, a transmission bandwidth of up to 20MHz is used to transmit signals, while a 5G or 6G communication system uses a frequency bandwidth greater than 20MHz in a frequency band of 3-6GHz or 6GHz or higher, so that the data transmission rate required by the 5G or 6G communication system can be met.

[0074] Meanwhile, mMTC is considered to support application services such as the Internet of Things (IoT) in 5G or 6G communication systems. In order to effectively provide the Internet of Things, for mMTC, it may be necessary to support the connection of a large number of UEs within a cell, improve the coverage of UEs, improve battery time, reduce the cost of UEs, etc. The Internet of Things provides a communication function while serving various types of sensors or various types of devices, and therefore should support a large number of UEs within a cell (e.g., 1,000,000 UEs / km 2 ). Because the mMTC-enabled UE may be located in a blind spot, such as a basement of a building that is not covered by a cell, wider coverage than other services provided by 5G or 6G communication systems may be required depending on the characteristics of the service. The mMTC-enabled UE should be a low-cost UE and it is difficult to replace its battery frequently, so a very long battery life, such as 10 to 15 years, may be required.

[0075] Finally, URLLC can be used for cellular-based wireless communication services for mission-critical purposes, such as remote control of robots or machines, industrial automation, services for drones, remote health care, emergency alerts, etc. Therefore, the communication provided by URLLC may need to provide very low latency (ultra-low latency) and very high reliability (ultra-reliability). For example, services supporting URLLC should meet an air interface delay of less than 0.5 milliseconds, and at the same time, may have a packet error rate of 10-5 or less. Therefore, for services supporting URLLC, 5G or 6G systems should provide fewer transmission time intervals (TTIs) than other services, and at the same time, design details for allocating wide resources in the frequency band may be required to ensure the reliability of the communication link.

[0076] The three services considered in the 5G or 6G communication system, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, different transmission and reception technologies and parameters can be used for the services to meet the different needs of the services. However, the above-mentioned mMTC, URLLC, and eMBB are only examples of different services, and the service types to which the present disclosure can be applied are not limited thereto.

[0077] Although the embodiments of the present disclosure will be described below in conjunction with LTE, LTE-A, LTE Pro, 5G (or NR or next generation mobile communication) or 6G systems as examples, the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. The embodiments of the present disclosure may be applied to other communication systems through some modifications by those skilled in the art, which will not deviate too much from the scope of the present disclosure.

[0078] In the present disclosure, "first frequency resources" refers to at least a portion of frequency resources owned or managed by a first mobile communication provider. "Second frequency resources" refers to at least a portion of frequency resources owned or managed by a second mobile communication provider.

[0079] In the present disclosure, "mobile communication provider" refers to a service provider that owns or manages a network and provides communication services to UEs. For example, a mobile communication provider may refer to a mobile network operator (MNO) or a mobile virtual network operator (MVNO). However, a mobile communication provider is not limited to an MNO or an MVNO, and may refer to any entity that can own or manage frequency resources.

[0080] In the present disclosure, "synchronization information" of a base station refers to information required for UE to synchronize with the base station. The synchronization information may include at least one of a cell ID, a cell ID group, or a frame timing.

[0081] Before explaining a method in which a base station communicates with a UE using resources of another base station according to an embodiment of the present disclosure, a frame structure of an LTE system and an LTE-A system to which the present disclosure is applicable will be described.

[0082] Figure 1 is a diagram showing a basic structure of a time-frequency domain in an LTE system according to an embodiment of the present disclosure, where the time-frequency domain is a wireless resource domain for transmitting data or control information.

[0083] Reference Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The smallest transmission unit in the time domain is the orthogonal frequency division multiplexing (OFDM) symbol, N symbOFDM symbols 101 constitute a time slot 102, and two time slots constitute a subframe 103. The length of each time slot is 0.5 ms, and the length of each subframe is 1.0 ms. A radio frame 104 is a time domain unit consisting of ten subframes. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth consists of a total of N BW The basic unit of resources in the time-frequency domain is a resource element (RE) 106, which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB or physical resource block (PRB)) 107 consists of N subcarriers 105 in the time domain. symb consecutive OFDM symbols 101 and N in the frequency domain RB Thus, one RB 107 includes (N symb xN RB ) RE 106. Generally, the minimum transmission unit of data is RB unit. Generally, in LTE system, N symb =7 and N RB =12, and N BW and N RB Proportional to the bandwidth of the system transmission band.

[0084] Hereinafter, downlink control information (DCI) in LTE and LTE-A systems will be described.

[0085] In the LTE system, scheduling information of downlink data or uplink data is sent from the base station to the UE through DCI. DCI can be defined in several formats. The base station is operated by applying a predetermined DCI format to the base station according to whether the scheduling information is for uplink data or downlink data, whether the DCI is a compact DCI with a small amount of control information, whether spatial multiplexing using multiple antennas is applied, whether the DCI is a DCI for power control, etc. For example, DCI format 1 (DCI format 1 is scheduling control information for downlink data) is configured to include at least the following control information.

[0086] Resource allocation type 0 / 1 flag: Indicates whether the resource allocation method is type 0 or type 1. Type 0 method indicates that resources are allocated in units of resource block groups (RBGs) by applying a bitmap method. In the LTE system, the basic unit of scheduling is a resource block (RB) represented by time domain and frequency domain resources. An RBG includes multiple RBs, and an RBG is used as the basic unit of scheduling in the type 0 method. Type 1 method indicates that a certain RB within an RBG is allocated.

[0087] Resource Block Allocation: Indicates the RBs allocated for data transmission. The resources to be expressed are determined based on the system bandwidth and resource allocation method.

[0088] Modulation and Coding Scheme (MCS): indicates a modulation method used for data transmission and the size of a transport block as data to be transmitted.

[0089] HARQ process number: notifies the process number of Hybrid Automatic Repeat Request (HARQ).

[0090] New data indicator: indicates whether the HARQ is an initial transmission or a retransmission.

[0091] Redundancy Version: Indicates the redundancy version of HARQ.

[0092] Transmit Power Control (TPC) Command for Physical Uplink Control Channel (PUCCH): Indicates the TPC command for PUCCH.

[0093] The DCI is channel-coded and modulated, and then transmitted through a physical downlink control channel (PDCCH).

[0094] A cyclic redundancy check (CRC) is attached to the payload of the DCI message, and the CRC is scrambled using a radio network temporary identifier (RNTI) corresponding to the identity of the UE. Different RNTIs may be used depending on the purpose of the DCI message, such as transmission of UE-specific data, power control commands, or random access responses. For example, the RNTI may not be explicitly transmitted, but may be included in the CRC calculation process. Upon receiving a DCI message sent in the PDCCH, the UE checks the CRC by using the assigned RNTI, and when the result of checking the CRC shows correctness, the UE recognizes that the message is sent to it.

[0095] Figure 2 201 is a diagram illustrating a PDCCH 201 which is a downlink physical channel in which DCI of LTE is transmitted according to an embodiment of the present disclosure.

[0096] Reference Figure 2 ,PDCCH 201 can be time-division multiplexed with PDSCH 202 as a data transmission channel and transmitted over the entire system bandwidth. The area of ​​PDCCH 201 is represented by the number of OFDM symbols, which is indicated to the UE as a control format indicator (CFI) sent through the physical control format indicator channel (PCFICH). Assigning PDCCH 201 to the OFDM symbol at the front of the subframe allows the UE to decode the downlink scheduling assignment as quickly as possible, thereby reducing the delay in the decoding of the downlink shared channel (DL-SCH), that is, the overall downlink transmission delay.

[0097] One PDCCH carries one DCI message and can schedule multiple UEs simultaneously in the downlink and uplink, so multiple PDCCHs are transmitted simultaneously in each cell. A cell-specific reference signal (CRS) 203 can be used as a reference signal for decoding PDCCH 201. CRS 203 can be sent for each subframe over the entire frequency band, and scrambling and resource mapping can be changed according to the cell identity (ID). Because CRS 203 is a reference signal shared by all UEs, UE-specific beamforming cannot be used. Therefore, the MIMO transmission method for LTE PDCCH is limited to open-loop transmission diversity. By decoding the physical broadcast channel (PBCH), the UE implicitly knows the number of CRS ports.

[0098] The resource allocation of PDCCH 201 is based on control channel elements (CCEs), and one CCE includes 9 resource element groups (REGs), i.e., a total of 36 resource elements (REs). The number of CCEs required for a certain PDCCH 201 can be 1, 2, 4, or 8, and can vary according to the channel coding rate of the payload of the DCI message. Link adaptation of PDCCH 201 is achieved using different numbers of CCEs.

[0099] The UE should detect the signal in a state where the information about the PDCCH 201 is unknown, and a search space indicating a set of CCEs for blind decoding is defined in LTE. The search space consists of a plurality of aggregation level (AL) sets of individual CCEs, and is not explicitly signaled, but is implicitly defined using a function according to the UE identifier and the subframe number. In each subframe, the UE decodes the PDCCH 201 to find all possible resource candidates that can be realized from the CCEs in the set search space, and processes the information declared valid for the UE through a CRC check.

[0100] The search space is classified into a UE-specific search space and a common search space. The common search space of PDCCH 201 can be checked by a certain group of UEs or all UEs to receive common cell control information, such as dynamic scheduling or paging messages related to system information. For example, scheduling allocation information for DL-SCH for transmitting system information block (SIB)-1 including cell operator information can be received by checking the common search space of PDCCH 201.

[0101] In LTE, the entire PDCCH region consists of a set of CCEs in a logical region, and there is a search space consisting of a set of CCEs. The search space is divided into a common search space and a UE-specific search space, and the search space for LTE PDCCH is defined as follows.

[0102] The combination of PDCCH candidates to be monitored is defined according to the search space, where the search space of aggregation level L∈{1,2,4,8} is defined by the set of PDCCH candidates For each serving cell on which PDCCH is monitored, the search space The CCE of PDCCH candidate m is given by:

[0103]

[0104] where Y k The definition is as follows: i = 0, ..., L-1. For the common search space m' = m. For the PDCCH UE-specific search space, for the serving cell on which the PDCCH is monitored, if the monitoring UE is configured with a carrier indicator field, then m' = m + M (L) ·n CI , where n CI is the carrier indicator field value, otherwise, if the monitoring UE is not configured with a carrier indicator field, then m′=m, where m=0,…,M (L) -1. M (L) is the number of PDCCH candidates to monitor in a given search space.

[0105] Note that the carrier indicator field value is the same as ServCellIndex

[0106] For the common search space, Yk is set to 0 for the two aggregation levels L=4 and L=8.

[0107] UE-specific search space for aggregation level L Variable Y k The definition is as follows: k =(A·Y k-1 )mod D

[0108] where Y -1 =n RNTI ≠0, A=39827, D=65537 and n s is the timeslot number within the radio frame. n is defined in subclause 7.1 (in the downlink) and subclause 8 (in the uplink). RNTI The RNTI value to use.

[0109] According to the above definition of the search space of the PDCCH, the UE-specific search space is not explicitly signaled, but is implicitly defined using a function based on the UE identifier and the subframe number. In other words, because the UE-specific search space can vary according to the subframe number, the UE-specific search space can vary over time, and the problem that a specific UE cannot use the search space due to other UEs (which is defined as blocking) can be solved. When all CCEs checked by the UE are used by other UEs that have been scheduled in the same subframe and therefore the UE cannot be scheduled in the same subframe, the problem can be prevented from occurring in subsequent subframes because such search space changes over time. For example, even when the UE-specific search spaces of the first UE and the second UE partially overlap in a certain subframe, the UE-specific search space varies in each subframe, so it is expected that the degree of overlap in subsequent subframes may change.

[0110] According to the above definition of the search space of the PDCCH, the common search space is defined as a set of predetermined CCEs so that the PDCCH can be received by a certain group of UEs or all UEs. In other words, the common search space does not change according to the UE identifier or subframe number. Although there is a common search space to transmit various system messages, the common search space can also be used to transmit control information for each UE. Therefore, the common search space can be used as a solution to the phenomenon that the UE cannot be scheduled due to insufficient resources available in the UE-specific search space.

[0111] A search space is a set of candidate control channels consisting of CCEs to be decoded by the UE at a given aggregation level, and there are various aggregation levels at which one, two, four or eight CCEs form a bundle. Therefore, the UE has multiple search spaces. The definition of the number of PDCCH candidates to be monitored in the search space according to the aggregation level definition in LTE PDCCH is shown in the following table.

[0112] Table 1

[0113]

[0114] According to Table 1, in the case of UE-specific search space, aggregation levels {1, 2, 4, 8} are supported, and {6, 6, 2, 2} PDCCH candidate groups are provided respectively. In the case of common search space, aggregation levels {4, 8} are supported, and {4, 2} PDCCH candidate groups are provided respectively. The reason why the common search space supports only {4, 8} aggregation levels is to improve coverage characteristics, because generally, system messages should reach the edge of each cell.

[0115] The DCI sent to the common search space is defined only for certain DCI formats, such as DCI format 0 / 1A / 3 / 3A / 1C corresponding to a certain purpose, such as for system messages or power control of UE groups. DCI formats with spatial multiplexing are not supported in the common search space. The downlink DCI format to be decoded in the UE-specific search space varies according to the transmission mode set for the corresponding UE. Because the transmission mode is set by RRC signaling, the correct subframe number is not specified to determine whether the setting of the transmission mode is valid for the corresponding UE. Therefore, regardless of the transmission mode, the UE can be operated to always perform decoding on DCI format 1A in order to prevent communication loss.

[0116] The method of transmitting or receiving a downlink control channel and downlink control information and the search space in LTE and LTE-A have been described above. The downlink control channel in a 5G or 6G communication system will be described below.

[0117] Figure 3 is a diagram showing basic units of time and frequency resources constituting an available downlink control channel in a 5G or 6G communication system according to an embodiment of the present disclosure.

[0118] Reference Figure 3 , the basic unit REG of the time and frequency resources constituting the control channel consists of 1 OFDM symbol 301 on the time axis and 12 subcarriers 302 (i.e., one RB) on the frequency axis. Assume that when the basic unit of the control channel is set, the basic unit of the time axis is one OFDM symbol 301, thereby time-division multiplexing the data channel and the control channel in one subframe. By positioning the control channel before the data channel, the processing time of the user can be reduced, making it easy to meet the delay time requirement. By setting the basic unit of the frequency axis of the control channel to one RB, frequency multiplexing can be performed more efficiently between the control channel and the data channel.

[0119] Can be connected Figure 3 The REG 303 shown in the figure is used to set channel areas of various sizes. For example, when the basic unit to which the downlink control channel is allocated in 5G or 6G is CCE 304, one CCE 304 can be composed of multiple REGs 303. Figure 3In the case of REG303 of 12 REs, when REG 303 is composed of 12 REs and one CCE 304 is composed of 6 REG303s, one CCE 304 can be composed of 72 REs. When a downlink control region is set, the region can be composed of multiple CCEs 304, and a specific downlink control channel can be transmitted while being mapped to one or more CCEs 304 according to the aggregation level AL in the control region. CCE 304 in the control region is identified using numbers. In this case, the numbering can be assigned according to the logical mapping method.

[0120] Figure 3 The basic unit of the downlink control channel, namely REG 303, may include an RE to which the DCI is mapped and an area to which a demodulation reference signal (DMRS) 305 is mapped, the demodulation reference signal being a reference signal for decoding the DCI. Figure 3 As shown, DMRS 305 may be transmitted in three REs in one REG 303. For reference, since DMRS 305 is transmitted using precoding (eg, a control signal mapped in REG 303), the UE may decode DMRS 305 without information about the precoding applied by the base station.

[0121] Figure 4 is a diagram showing a control region (control resource set CORESET) in a 5G or 6G wireless communication system in which a downlink control channel is transmitted according to an embodiment of the present disclosure.

[0122] Reference Figure 4 , the frequency axis represents the system bandwidth 410, and the time axis represents a time slot 420 (in which two control regions (a first control resource set 401 and a second control resource set 402) are set. Figure 4 In the example of FIG. 4 , it is assumed that one time slot corresponds to seven OFDM symbols). The control resource sets 401 and 402 may be set to a certain subband 403 corresponding to the entire system bandwidth 410 on the frequency axis. The control resource sets 401 and 402 may be set to one or more OFDM symbols on the time axis, and the number of symbols may be defined as a control resource set duration 404. Figure 4 In the embodiment, the first control resource set 401 is set to a control resource set duration of two symbols, and the second control resource set 402 is set to a control resource set duration of one symbol.

[0123] In the above-mentioned 5G or 6G system, the control region may be set by the base station through higher layer signaling to the UE (e.g., system information, master information block (MIB) or radio resource control (RRC) signaling). Setting of the control region for the UE refers to providing the UE with information such as the location of the control region, resource allocation of the control region, subband, and duration of the control resource set. For example, the information provided by the base station may include the following information.

[0124] Table 2

[0125]

[0126]

[0127] In addition to the above-mentioned setting information, various types of information required to transmit a downlink control channel may be set for the UE.

[0128] Hereinafter, downlink control information (DCI) in a 5G or 6G system will be described below.

[0129] In a 5G or 6G system, scheduling information for uplink data (physical uplink shared channel (PUSCH)) or downlink data (physical downlink shared channel (PDSCH)) is sent from a base station to a UE via DCI. The UE can monitor the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may include a fixed field between the base station and the UE, and the non-fallback DCI format may include a configurable field.

[0130] The fallback DCI for scheduling PUSCH may include, for example, the following information.

[0131] Table 3

[0132]

[0133]

[0134] The non-fallback DCI for scheduling PUSCH may include, for example, the following information.

[0135] Table 4

[0136]

[0137]

[0138] The fallback DCI for scheduling the PDSCH may include, for example, the following information.

[0139] Table 5

[0140]

[0141]

[0142] The non-fallback DCI for scheduling the PDSCH may include, for example, the following information.

[0143] Table 6

[0144]

[0145]

[0146] The DCI may be channel coded and modulated and then sent over a physical downlink control channel (PDCCH). A cyclic redundancy check (CRC) is attached to the payload of the DCI message, and the CRC is scrambled using a radio network temporary identifier (RNTI) corresponding to the UE identity. Different RNTIs may be used depending on the purpose of the DCI message (e.g., UE-specific data transmission, power control commands, or random access responses). For example, the RNTI is not transmitted explicitly, but rather is included in the CRC calculation process. Upon receiving a DCI message sent in the PDCCH, the UE checks the CRC by using the assigned RNTI, and when the result of checking the CRC shows correctness, the UE recognizes that the message is sent to it.

[0147] For example, the DCI used to schedule PDSCH for system information (SI) may be scrambled with SI-RNTI. The DCI used to schedule PDSCH for a random access response (RAR) message may be scrambled with RA-RNTI. The DCI used to schedule PDSCH for a paging message may be scrambled with P-RNTI. The DCI that notifies the slot format indicator (SFI) may be scrambled with SFI-RNTI. The DCI that notifies the transmission power control (TPC) may be scrambled with TPC-RNTI. The DCI used to schedule a UE-specific PDSCH or PUSCH may be scrambled with a cell RNTI (C-RNTI).

[0148] When a data channel (ie, PUSCH or PDSCH) is scheduled for a certain UE through the PDCCH, data in the scheduled resource region is transmitted or received together with the DMRS.

[0149] Figure 5 It shows a case where the UE according to an embodiment of the present disclosure is set to use 14 OFDM symbols as one time slot (or subframe) in a downlink, sends the PDCCH 501 in two initial OFDM symbols, and sends the DMRS in the third symbol.

[0150] refer to Figure 5, among those RBs scheduled as PDSCH, PDSCH 503 may be transmitted in REs of the third symbol to which data is mapped and DMRS 502 is not transmitted, and REs of the fourth symbol to the last symbol. In the case of the LTE / LTE-A system, the subcarrier spacing Δf may be 15 kHz, and in the case of the 5G or 6G system, one of {15, 30, 60, 120, 240, 480} kHz may be used.

[0151] In wireless communication systems, specific spectrum resources can be allocated specifically for specific services. Typically, in the case of cellular communications, the state leases specific spectrum resources to specific mobile communication providers, and the spectrum resource mobile communication providers can use the resources exclusively to maintain the cellular network. However, the spectrum allocated to each mobile communication provider is not fully utilized except in time and space situations where data traffic is very high, and therefore, resource waste may occur.

[0152] According to an embodiment of the present disclosure, in order to solve the above-mentioned resource waste situation, it is possible to consider the situation of implementing dynamic frequency sharing between mobile communication providers. For example, spectrum resources that each mobile communication provider has priority to use can be allocated to each mobile communication provider, but when the usage of the spectrum resources is small, it can be allowed to be used by other mobile communication providers. When each mobile communication provider can share the resources of other mobile communication providers, each mobile communication provider does not need to be allocated an unnecessary large spectrum to cope with the maximum business situation. Therefore, the spectrum resources can be effectively operated according to the dynamic frequency sharing system between mobile communication providers.

[0153] However, when dynamic frequency sharing between mobile communication providers is possible, synchronization-related problems may arise. In a cellular network (e.g., LTE or NR), a base station may periodically send a synchronization signal, and a UE may listen to the synchronization signal and identify synchronization information at a corresponding frequency. In this case, synchronization signals sent by multiple base stations of the same mobile communication provider may be received simultaneously, so there is an identifier (e.g., a cell ID) for distinguishing between base stations. However, in a dynamic frequency sharing scenario between mobile communication providers, multiple base stations of several mobile communication providers need to be considered, and therefore it may be difficult to use a method for sending and receiving synchronization signals in an existing cellular network. Therefore, identification information for distinguishing between mobile communication providers may be required.

[0154] Refer to the following Figures 6 to 25 A method of communicating with a UE according to an embodiment of the present disclosure is described, the method being performed by a base station by using resources of another base station.

[0155] Figure 6is a diagram illustrating a concept of a method for communicating with a UE by using frequency resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a first base station of a first mobile communication provider.

[0156] Reference Figure 6 , the first mobile communication provider may manage the first base station 10 and provide services through the first frequency resources 610. The first base station 10 may establish communication with the UE by using some of all the first frequency resources 610.

[0157] The first UE 630 may be a UE that subscribes to a communication service provided by a first mobile communication provider, and the second UE 640 may be a UE that subscribes to a communication service provided by a second mobile communication provider. The first UE 630 may receive a communication service from the first mobile communication provider through the first base station 10, and the second UE 640 may receive a communication service from the second mobile communication provider through the second base station 20.

[0158] The first mobile communication provider may provide communication services to the UE through frequency resources owned or managed by the first mobile communication provider. However, according to an embodiment of the present disclosure, the first mobile communication provider may communicate with the first UE 630 through a second frequency resource that is not owned or managed by the first mobile communication provider. For example, the first mobile communication provider may communicate with the first UE 630 through the first base station 10 by using the second frequency resource 620 owned or managed by the second mobile communication provider.

[0159] When the first base station 10 establishes communication through the first frequency resource 610, the first base station 10 may be referred to as a primary base station (P-BS) with respect to the first frequency resource 610. The first frequency resource 610 may be referred to as a primary carrier (P-carrier) with respect to the first base station 10. When the first base station 10 establishes communication through the second frequency resource 620, the first base station 10 may be referred to as a secondary base station (S-BS) with respect to the second frequency resource 620. The second frequency resource 620 may be referred to as a secondary carrier (S-carrier) with respect to the first base station 10. Similarly, when communication is established through the P-BS and the P-carrier, the UE may be referred to as a primary UE (P-UE), and when communication is established through the S-BS and the S-carrier, the UE may be referred to as a secondary UE (S-UE).

[0160] The UE can communicate with the base station through the frequency resource by obtaining the synchronization information of the base station. For example, the first UE 630 can receive the synchronization information of the first base station 10 sent from the first base station 10 through the first frequency resource 610 to communicate with the first base station 10 through the first frequency resource 610. The first UE 630 can communicate with the first base station 10 based on the received synchronization information.

[0161] However, since the frequency resources are independent and synchronization can be performed independently therethrough, the synchronization information about each frequency resource may be different. Therefore, it may be necessary to obtain the synchronization information of the first base station 10 in the second frequency resource 620 so that the first UE 630 can communicate with the first base station 10 through the second frequency resource 620.

[0162] In an embodiment of the present disclosure, the first UE 630 may obtain synchronization information of the first base station 10 in the second frequency resource 620 according to various methods. For example, the first UE 630 may obtain synchronization information of the first base station 10 from the first base station 10 through the first frequency resource 610 or the second frequency resource 620. Alternatively, the first UE 630 may obtain synchronization information of the first base station 10 from the second base station 20.

[0163] When both the synchronization information of the first base station 10 and the synchronization information of the second base station 20 are transmitted through the second frequency resource 620, it may be necessary to allow the first UE 630 to identify the synchronization information provided by the mobile communication provider subscribed by the first UE 630 (ie, Figure 1 Therefore, according to an embodiment of the present disclosure, identification information of a mobile communication provider (eg, MNO ID) may be included in the synchronization information transmitted from the base station.

[0164] According to an embodiment of the present disclosure, when multiple base stations establish communication using the same frequency resources, the priority of communication between the P-BS and the P-UE may be higher than the priority of communication between the S-BS and the S-UE. Figure 1 , when each of the first base station 10 and the second base station 20 uses the second frequency resource 620 to communicate with the UE to which the service is provided, the priority of the communication between the second base station 20 (which is a P-BS with respect to the second frequency resource 620) and the second UE 640 (which is a P-UE with respect to the second frequency resource 620) may be higher than the priority of the communication between the first base station 10 (which is an S-BS with respect to the second frequency resource 620) and the first UE 630 (which is an S-UE with respect to the second frequency resource 620). The communication with a high priority may be preferentially performed. For example, time and frequency resources may be preferentially allocated for high priority communication.

[0165] Refer to the following Figures 7 to 25 Various methods for obtaining synchronization information of the first base station 10 regarding communication using the second frequency resource 620 are described, and the methods are performed by the first UE 630 .

[0166] Figure 7is a flowchart of a method for communicating with a UE by using frequency resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a first base station of a first mobile communication provider.

[0167] Reference Figure 7 , in operation 710, the first base station may request permission for the first base station to use a second frequency resource of a second mobile communication provider.

[0168] According to an embodiment of the present disclosure, the first base station may request the second base station to permit the first base station to use the second frequency resource. The conditions or circumstances under which the first base station requests the second base station to permit the first base station to use the second frequency resource may be determined differently. For example, the first base station may request the second base station to permit the use of the second frequency resource when the frequency resources of the first mobile communication provider are saturated or when the amount of allocated frequency resources exceeds a certain threshold. However, the conditions under which the first base station requests permission to use the second frequency resource are not limited thereto.

[0169] The first base station may also request permission from a server of the second mobile communication provider or a base station other than the second base station to use the second frequency resource. However, for ease of description, the case where the first base station requests permission from the second base station to use the second frequency resource will be described as an example.

[0170] In an embodiment of the present disclosure, the request for permission to use the second frequency resource may include various information necessary for the first base station to use the second frequency resource. For example, the request for permission to use the second frequency resource may include information about the time and frequency resources determined by the first base station for communicating with the UE through the second frequency resource. The request for permission to use the second frequency resource may also include information requesting the allocation of time and frequency resources that can be used by the first base station. The request for permission to use the second frequency resource may also include information about the time and frequency resources for the first base station to send its synchronization information to the UE by using the second frequency resource. The request for permission to use the second frequency resource may also include identification information of the first mobile communication provider that manages the first base station or information requesting the allocation of identification information of the first mobile communication provider.

[0171] The first base station may receive a response to the request for permission to use the second frequency resource from the second base station, and communicate with the UE based on the received response.

[0172] In an embodiment of the present disclosure, the request for permission to use the second frequency resource may be a notification notifying the first base station that the second frequency resource will be used. For example, the first base station may use the second frequency resource without receiving a response to the request for permission to use the second frequency resource from the second base station. For example, the first base station may communicate with the UE by using the frequency and time resources that the first base station has notified the second base station to use.

[0173] In an embodiment of the present disclosure, when the second base station does not allow the first base station to use the second frequency resource, the second base station may send a message (e.g., a negative acknowledgement (NACK)) notifying that the second frequency resource is unavailable to the first base station. When receiving a message rejecting the request from the second base station, the first base station may not use the second frequency resource.

[0174] In an embodiment of the present disclosure, the second base station may send a message to the first base station indicating to stop using the second frequency resource when the first base station communicates with the UE by using the second frequency resource. When receiving the message indicating to stop using the second frequency resource, the first base station may not send a signal to the UE or receive a signal from the UE through the second frequency resource.

[0175] In operation 720, the first base station may transmit setting information for establishing communication through second frequency resources of a second mobile communication provider to the UE by using first frequency resources of the first mobile communication provider.

[0176] In an embodiment of the present disclosure, the setting information may be information set by the first base station to instruct the UE to use the second frequency resource. The setting information may include information about the frequency band of the second frequency resource. The UE may be pre-set to communicate with the first base station of the first mobile communication provider not only through the first frequency resource of the first mobile communication provider subscribed by the UE, but also through the second frequency resource of the second mobile communication provider not subscribed by the UE.

[0177] Information about the frequency band of the second frequency resource may be pre-stored in the UE.The setting information transmitted from the first base station to the UE may include information for setting the UE to activate communication using the second frequency resource.

[0178] Alternatively, the setting information may include information about a method for the UE to obtain synchronization information corresponding to the first base station in the second frequency resource. For example, the setting information may include information for setting the UE to obtain synchronization information corresponding to the first base station in the second frequency resource through the first frequency resource. In addition, the setting information may include information for setting the synchronization information corresponding to the first base station to be obtained through the second frequency resource.

[0179] In an embodiment of the present disclosure, the setting information may include information for setting the UE to obtain synchronization information corresponding to the first base station from the second base station. However, the method for obtaining the synchronization information is not limited to the above example, and the first base station may set and provide various methods for obtaining the synchronization information corresponding to the first base station through the setting information.

[0180] The UE may be configured to receive the setting information, and obtain synchronization information corresponding to the first base station from the second frequency resource based on the received setting information.

[0181] In an embodiment of the present disclosure, when information about a method for the UE to obtain synchronization information corresponding to the first base station is preset in the UE, the setting information may not include information about the method.

[0182] In addition, the setting information may include information about time and frequency resources by which the first base station can communicate with the UE by using the second frequency resources. For example, the setting information may include information about time and frequency resources by which the first base station sends synchronization information to communicate with the UE by using the second frequency resources. The setting information may also include identification information of a first mobile communication provider that manages the first base station.

[0183] In operation 730, the first base station may communicate with the UE through the second frequency resource based on the setting information.

[0184] The first base station may send synchronization information for communication between the first base station and the UE to the UE by using the second frequency resource based on the setting information. The terminal may obtain the synchronization information of the first base station based on the setting information received from the first base station. The base station and the UE may send or receive control information or data by using the second frequency resource based on the synchronization information.

[0185] Figure 8 is a diagram illustrating a synchronization signal according to an embodiment of the present invention.

[0186] Reference Figure 8 When the first base station 10 of the first mobile communication provider communicates with the UE through the first frequency resource of the first mobile communication provider, the first base station 10 may send a periodic synchronization signal 810 to the UE.

[0187] The periodic synchronization signal 810 may include a cell ID 811, by which the UE can identify the cell. In addition, the periodic synchronization signal 810 may include a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The periodic synchronization signal 810 may include a synchronization signal (SS) block, which includes a PSS, SSS, and a physical broadcast channel (PBCH) in the NR system. The PSS, SSS, PBCH, and SS blocks are well known in the field of mobile communication technology, so their detailed description will be omitted here.

[0188] In an environment where each mobile communication provider communicates with a UE that has subscribed to a communication service provided by each mobile communication provider using only frequency resources owned or managed by the mobile communication provider, the synchronization information received by the UE is related to the mobile communication provided by the mobile communication provider and subscribed by the UE. Therefore, due to the synchronization information, the UE may not need to additionally identify the mobile communication provider, and the periodic synchronization signal 810 transmitted from the first base station 10 to the UE may not include the identification information of the first mobile communication provider 10.

[0189] Fig. 9 is a diagram illustrating a synchronization signal including identification information of a mobile communication provider according to an embodiment of the present disclosure.

[0190] Reference Fig. 9 When the first base station 10 and the second base station 20 share the second frequency resource, the first base station 10 can send the first synchronization signal 910 through the second frequency resource, and the second base station 20 can also send the second synchronization signal 920 through the second frequency resource.

[0191] In an environment where each mobile communication provider not only uses frequency resources owned or managed by each mobile communication provider but also shares frequency resources owned or managed by other mobile communication providers, it may be necessary to distinguish synchronization signals sent from base stations of different mobile communication providers through the same frequency resources. In an embodiment of the present disclosure, the periodic synchronization signal sent from the base station may include identification information of the mobile communication provider that manages the base station. For example, the synchronization signal may include a mobile network operator identifier (MNO ID) as identification information of the mobile communication provider. For example, the first synchronization signal 910 sent from the first base station 10 may include a cell ID 913 and an MNO ID 911. Similarly, the second synchronization signal 920 sent from the second base station 20 may include a cell ID and an MNO ID.

[0192] When receiving the synchronization signals transmitted from the plurality of base stations through the second frequency resource, the UE may identify the synchronization signals transmitted from the base stations of the mobile communication provider providing the communication service to the UE by identifying the MNO ID included in the synchronization signals.

[0193] In order for the UE to identify the mobile communication provider through the identification information of the mobile communication provider, information about the correspondence between the mobile communication provider and the identification information may be required. In an embodiment of the present disclosure, a unique global MNO ID can be assigned to each mobile communication provider to distinguish all mobile communication providers. In addition, a unique local MNO ID can be assigned to each mobile communication provider to distinguish all mobile communication providers that provide communication services within a specific area (e.g., a country or state). When each mobile communication provider is assigned a local MNO ID, the amount of information required to distinguish the mobile communication providers (e.g., the number of bits included in the synchronization signal) can be small, and resources can be used more efficiently.

[0194] In an embodiment of the present disclosure, information about the MNO IDs assigned to various mobile communication providers may be pre-stored in the UE. Alternatively, only the MNO IDs of the mobile communication providers that provide communication services to the UE may be stored in the UE. Alternatively, the base station of the mobile communication provider may send the MNO ID to the UE. For example, the first base station 10 may send information about the unique MNO ID of the first mobile communication provider to the UE. The UE may identify the MNO ID of the first mobile communication provider based on the information sent thereto, and may store the identified MNO ID.

[0195] Alternatively, the UE may identify the mobile communication provider providing communication services to it by distinguishing at least one mobile communication provider that sends the synchronization signal through the second frequency resource. For example, the UE may not need information for distinguishing the mobile communication provider providing communication services to it and other mobile communication providers that do not perform communication services to it through the second frequency resource.

[0196] In an embodiment of the present disclosure, the MNO ID of the mobile communication provider that manages the first base station 10 may be set or allocated by the second base station 20. The second base station 20 may allocate the MNO ID to at least one base station that requests the second base station 20 to provide the second frequency resource and the second base station 20 itself, so as to distinguish between the mobile communication providers that manage the base stations. The UE may receive the allocated MNO ID from the first base station 10 or the second base station 20. When the MNO ID is allocated by the second base station 20, due to the MNO ID, it is not necessary to distinguish other mobile communication providers that do not establish communication through the second frequency resource, so the amount of information of the transmitted MNO ID may be small.

[0197] A method of transmitting identification information (eg, MNO ID) of a mobile communication provider through a synchronization signal may be variously determined.

[0198] In an embodiment of the present disclosure, the MNO ID may not be additionally included in the synchronization signal, and the frequency resource for transmitting the synchronization signal may be used to distinguish different mobile communication providers.

[0199] In an LTE system, PSS and SSS may be transmitted in a frequency resource at the center of a carrier. In an NR system, an SS block may be transmitted in a frequency resource located in a synchronization grid. For example, in an LTE system and an NR system, the frequency resources that a UE should attempt to receive in order to search for PSS, SSS, or SS blocks may be limited. In an embodiment of the present disclosure, a base station may transmit a synchronization signal through a frequency resource other than a frequency resource that transmits PSS, SSS, or SS blocks in an existing LTE or NR system, and a UE may identify a mobile communication provider by identifying the frequency resource of a synchronization signal received from a base station.

[0200] For example, the first base station 10 may send a synchronization signal to the UE in the second frequency resource of the second mobile communication provider through a third frequency resource that is different from the frequency domain in which the second synchronization signal 920 of the second base station 20 is transmitted. When the synchronization signal is received through the third frequency resource, the UE may recognize that the synchronization signal is a synchronization signal for a communication service provided by the first mobile communication provider. When the UE is not a UE receiving a communication service from the first mobile communication provider, the UE may ignore the synchronization signal sent through the third frequency resource.

[0201] Mapping information between the frequency resource for transmitting the synchronization signal and the mobile communication provider may be required so that the UE can identify the mobile communication provider through the frequency resource for receiving the synchronization signal. For example, when the first mobile communication provider provides communication services through the frequency resource of the second mobile communication provider, the mapping information may include information indicating that the synchronization signal can be transmitted through the third frequency resource.

[0202] In an embodiment of the present disclosure, mapping information between frequency resources for transmitting synchronization signals and mobile communication providers may be pre-stored in the UE. Alternatively, only mapping information corresponding to the mobile communication provider providing communication services to the UE may be stored in the UE. Alternatively, the base station of the mobile communication provider may send mapping information to the UE. For example, the first base station 10 may send mapping information corresponding to the first mobile communication provider to the UE. The UE may store information about the mapping between the third frequency resource and the first mobile communication provider based on the mapping information.

[0203] In an embodiment of the present disclosure, different mobile communication providers may be distinguished from each other through a synchronization signal sequence without additionally using time and frequency resources to include an MNO ID in the synchronization signal.

[0204] In the LTE system and the NR system, the signal that the UE first receives to obtain synchronization information is the PSS, so the identification information of the mobile communication provider may need to be included in the PSS. In the LTE system and the NR system, three situations can be identified by the PSS. For example, among 1068 cell IDs, three cell ID groups can be identified by the PSS, each cell ID group includes 356 cell IDs, and the 356 cell IDs included in each cell ID group can be identified by the SSS. In the case of the LTE system, the Zadoff-Chu sequence can be used to generate the PSS sequence, and in the case of the NR system, the M sequence can be used to generate the PSS sequence. However, the number of different PSS sequences that can be generated using the Zadoff-Chu sequence or the M-sequence can be three or more. In an embodiment of the present disclosure, by increasing the number of different PSS sequences generated using the Zadoff-Chu sequence or the M-sequence to more than three, and matching at least one added sequence to different mobile communication providers, the mobile communication provider can be identified by the PSS sequence.

[0205] In an embodiment of the present disclosure, other types of PSS sequences can be added by using values ​​other than 25, 29, and 34 used in the prior art as the root index of the Zadoff-Chu sequence and matching at least one added PSS sequence with a different mobile communication identifier, thereby identifying a mobile communication provider through a PSS sequence. u (n) can be determined by the following equation 1.

[0206]

[0207] In Equation 1 above, u represents the root index, and 63 represents the length of the sequence.

[0208] When using the Zadoff-Chu sequence shown in Equation 1 above to generate PSS sequences that are distinguished from each other, a value that is relatively prime to 63 (which is the length of the sequence) should be used as the root index u. In the LTE system, 25, 29 and 34 can be used as the root index u to generate three different PSS sequences. In an embodiment of the present disclosure, the mobile communication provider can be identified by the PSS sequence in the following manner: different PSS sequences are generated by using values ​​other than 25, 29 and 34 among the values ​​relatively prime to 63 (which is the length of the sequence) as the root index u, and the generated different PSS sequences or different root indexes are matched with different mobile communication providers. For example, different root indices can be 17, 19, 20, 22, 23, 26, etc., but are not limited to this.

[0209] In the embodiment of the present disclosure, by modifying the M sequence used to generate the PSS sequence to add other types of PSS sequences and matching the added PSS sequences with different mobile communication identifiers, the mobile communication provider can be identified by the PSS sequence. u (n) can be determined by the following equations 2 and 3.

[0210] [Equation 2]

[0211] d(n)=1-2x(m)

[0212] [Equation 3]

[0213]

[0214] In equations 2 and 3 above, n is a natural number (0≤n≤127) and 1,2}.

[0215] When the M-sequences shown in equations 2 and 3 above are used to generate PSS sequences that are distinguishable from each other, 0≤m≤127, so it can be obtained according to Generate three different PSS sequences. In the embodiment of the present disclosure, in the above equation 3, "43" can be changed to another natural number k (0≤k≤127) to generate a PSS sequence different from the three PSS sequences that can be generated using "43". In addition to changing "43" to other natural numbers of k, when necessary, it is possible to generate a PSS sequence different from the three PSS sequences that can be generated using "43". The PSS sequence is changed to a natural number set other than {0, 1, 2} to generate different PSS sequences. Thereafter, the generated different PSS sequences are matched with different mobile communication providers, so that the mobile communication provider can be identified by the PSS sequence.

[0216] For example, the first base station 10 can send a PSS generated according to the above-mentioned method of adding a PSS sequence to the UE in the second frequency resource of the second mobile communication provider. The UE can recognize that the PSS is a synchronization signal for the communication service provided by the first mobile communication provider by processing the Zadoff-Chu sequence or M sequence of the received PSS.

[0217] The UE may need mapping information between the PSS sequence generated according to the above-mentioned method of adding the PSS sequence and the mobile communication provider to identify the mobile communication provider through the PSS.

[0218] In an embodiment of the present disclosure, mapping information between a PSS sequence and a mobile communication provider may be pre-stored in the UE. Alternatively, only mapping information corresponding to a mobile communication provider providing communication services to the UE may be stored in the UE. Alternatively, a base station of the mobile communication provider may send mapping information to the UE. For example, the first base station 10 may send mapping information corresponding to the first mobile communication provider to the UE. The UE may store information about the mapping between the PSS sequence and the first mobile communication provider based on the mapping information.

[0219] As described above, when different mobile communication providers are distinguishable from each other through the PSS sequence and the synchronization signal sequence, the base station may not additionally allocate time and frequency resources to transmit the MNO ID to the UE. Therefore, time and frequency resources may be effectively utilized.

[0220] Fig.10 is a diagram illustrating a method for transmitting synchronization information by using a non-periodic preamble according to an embodiment of the present invention, the method being performed by a base station.

[0221] Reference Fig.10 In order to communicate with the UE by using the second frequency resource of the second mobile communication provider, the first base station 10 may send synchronization information to the UE by sending a non-periodic preamble code 1010 .

[0222] When the first base station 10 periodically sends a synchronization signal by using the second frequency resource, the available resources may be reduced, which may be a burden for the second base station 20. Therefore, according to an embodiment of the present disclosure, the first base station 10 can send synchronization information to the UE by sending a preamble when sending data to the UE, instead of periodically sending a synchronization signal. For example, in order to send data 1020 to the UE, the first base station 10 can send synchronization information to the UE by sending a non-periodic preamble 1010 before sending the data 1020. When the first base station 10 sends synchronization information to the UE through the non-periodic preamble 1010, the synchronization information can be sent only when there is data to be sent, thereby preventing the second frequency resources used by the second base station 20 from being periodically occupied.

[0223] In an embodiment of the present disclosure, the non-periodic preamble 1010 may include the MNO ID 1011 and the cell ID 1013 of the first mobile communication provider as synchronization information of the first base station 10. Signals of base stations of two or more mobile communication providers may be transmitted through the second frequency resource. Therefore, the UE can identify the signal transmitted from the first mobile communication provider by identifying the MNOID 1011 included in the non-periodic preamble 1010.

[0224] In addition, when the first base station 10 transmits synchronization information through the non-periodic preamble 1010 without periodically transmitting a synchronization signal, only the synchronization signal 920 may exist as a periodic synchronization signal transmitted through the second frequency resource. Therefore, the second synchronization signal 920 may not include the MNO ID for identifying the second mobile communication provider. The MNO ID is as described above. Figure 8 and Fig. 9 The detailed description thereof is omitted here.

[0225] The first base station 10 may communicate with the UE using the second frequency resource by transmitting only the periodic synchronization signal 910 or only the aperiodic preamble 1010 , or may transmit both the periodic synchronization signal 910 and the aperiodic preamble 1010 .

[0226] Fig.11 1 is a diagram illustrating a method of allocating resources to a first base station of a first mobile communication provider so as to communicate with a UE by using a second frequency resource of a second mobile communication provider according to an embodiment of the present disclosure.

[0227] Reference Fig.11 In operation 1101, the first base station 10 may request the second base station 20 to allow the first base station 10 to use a second frequency resource of a second mobile communication provider.

[0228] For example, the first base station 10 may request the second base station 20 to allow the use of the second frequency resource when the frequency resource of the first mobile communication provider is saturated or when the amount of allocated frequency resources exceeds a certain threshold. The request for permission to use the second frequency resource may include identification information of the first mobile communication provider that manages the first base station 10 or information requesting the allocation of identification information of the first mobile communication provider.

[0229] In operation 1103 , the first base station 10 may receive a response to the request from the second base station 20 .

[0230] In an embodiment of the present disclosure, the second base station 20 may determine whether to allow the first base station 10 to use the second frequency resource based on the occupation state of the second frequency resource. For example, when the second frequency resource is saturated or when the amount of allocated frequency resources exceeds a certain threshold, the second base station 20 may not allow the first base station 10 to use the second frequency resource. When the size of the area where the second frequency resource is occupied or to be occupied is equal to or less than the size of the predetermined area, the second base station 20 may allow the first base station 10 to use the second frequency resource. The second base station 20 may send a response to the request to the first base station 10. For example, the second base station 20 may send a message to the first base station 10 notifying whether the use of the second frequency resource is allowed or not. When the first base station 10 is allowed to use the second frequency resource, the second base station 20 may send an ACK, and when the first base station 10 is not allowed to use the second frequency resource, the second base station 20 may send a NACK.

[0231] Alternatively, the second base station 20 may send ACK or NACK to notify that the request from the first base station 10 has been successfully received, but is unsure whether to allow the request from the first base station 10 .

[0232] Operation 1103 may be omitted. For example, when the second base station 20 successfully receives the request from the first base station 10 or when the second base station 20 allows the first base station 10 to use the second frequency resource, the second base station 20 may not send a response to the first base station 10.

[0233] In operation 1105, the first base station 10 may request the second base station 20 to allocate time and frequency resources to the first base station 10 to communicate with the UE by using the second frequency resources. The request for allocating time and frequency resources may include a request for allocating time and frequency resources for sending synchronization information to the first base station 10, and a request for allocating time and frequency resources for sending control information and data.

[0234] In an embodiment of the present disclosure, the first base station 10 may receive a response to the request for permission to use the second frequency resource from the second base station 20, and thereafter send a request for allocating time and frequency resources to the second base station 20 based on the received response. Alternatively, the first base station 10 may request the second base station 20 to allocate time and frequency resources without receiving a response from the second base station 20.

[0235] In operation 1107 , time and frequency resources may be allocated from the second base station 20 to the first base station 10 .

[0236] In an embodiment of the present disclosure, the second base station 20 may allocate time and frequency resources to the first base station 10 based on the occupation status of the second frequency resources. The second base station 20 may allocate time and frequency resources not scheduled for the second frequency resources to the first base station 10.

[0237] In operation 1109 , the first base station 10 may transmit, to the UE 30 , setting information for establishing communication through the second frequency resource of the second mobile communication provider.

[0238] In an embodiment of the present disclosure, the setting information may include information about a method for the UE 30 to obtain synchronization information corresponding to the first base station 10 in the second frequency resource. In addition, the setting information may include information about time and frequency resources allocated by the second base station 20 to the first base station 10. The setting information may include information about time and frequency resources allocated to the first base station 10 for sending synchronization information by using the second frequency resource.

[0239] In operation 1111, the first base station 10 may transmit synchronization information to the UE 30 by using the allocated time and frequency resources. The first base station 10 may transmit synchronization information to the UE 30 by transmitting a periodic synchronization signal or an aperiodic preamble using the allocated time and frequency resources.

[0240] In operation 1113, based on the synchronization information and the setting information, the first base station 10 may communicate with the UE 30 through the second frequency resource. Based on the synchronization information received from the first base station 10, the UE 30 may transmit or receive control information or data by using the second frequency resource.

[0241] The details of operations 1101, 1109, and 1113 may correspond to those of the above references. Figure 7 Details of operations 710, 720, and 730 are described.

[0242] Fig.12 is a diagram illustrating a method for communicating with a UE by using resources preferred by a first base station among resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a first base station of a first mobile communication provider.

[0243] In an embodiment of the present disclosure, the first base station 10 may send information about the resources preferred by the first base station 10 while requesting the second base station 20 to allow the use of the second frequency resources. The resources preferred by the first base station 10 may include at least one resource area and information about the preference of each resource area. The second base station 20 may allocate resources to the first base station 10 based on the information about the resources preferred by the first base station 10.

[0244] Reference Fig.12, when the first base station 10 transmits the first synchronization signal 1210 in the first frequency resource and transmits the third synchronization signal 1215 in the second frequency resource through the same time resource, the UE can easily obtain synchronization information. For example, the first base station 10 can transmit the third synchronization signal 1215 by using the same time resource as the first synchronization signal 1210 that has been transmitted to the UE in the first frequency resource, and therefore, the time resource for transmitting the synchronization signal 1215 may not be additionally determined. In addition, in order to receive the third synchronization signal 1215, the UE may not search for a time resource different from the time resource for transmitting the first synchronization signal 1210 in the second frequency resource.

[0245] Therefore, in an embodiment of the present disclosure, the first base station 10 may send information to the second base station 20 indicating that the first base station 10 preferably sends the third synchronization signal 1215 through the same time resource as the time resource for sending the first synchronization signal 1210 .

[0246] The second base station 20 may determine whether to allow the first base station 10 to use the preferred resource based on the preference of the first base station 10. For example, when the time resource for sending the first synchronization signal 1210 does not overlap with the time resource for sending the second synchronization signal 1220 of the second base station, the second base station 20 may allow the first base station 10 to send the third synchronization signal 1215 through the time resource for sending the first synchronization signal 1210. When the time resource for sending the first synchronization signal 1210 partially overlaps with the time resource for sending the second synchronization signal 1220 of the second base station, the second base station 20 may allocate resources so that the first synchronization signal 1210 is sent in a frequency resource different from the frequency resource for sending the second synchronization signal 1220.

[0247] Fig.13 is a diagram illustrating a method for communicating with a UE by using resources determined by a first base station of a first mobile communication provider among resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by the first base station.

[0248] Reference Fig.13 , in operation 1301, the first base station 10 may determine time and frequency resources for communicating with the UE 30 by using second frequency resources of a second mobile communication provider.

[0249] In an embodiment of the present disclosure, when the frequency resources of the first mobile communication provider are saturated or when the amount of allocated frequency resources exceeds a certain threshold, the first base station 10 may consider communication using the second frequency resources of the second mobile communication provider.

[0250] As mentioned above Fig.11As described above, the first base station 10 may be allocated time and frequency resources from the second base station 20 to communicate with the UE 30 by using the second frequency resources. In an embodiment of the present disclosure, the first base station 10 may determine the time and frequency resources for communication using the second frequency resources.

[0251] In an embodiment of the present disclosure, the first base station 10 may detect the occupation state of the second frequency resource, and determine the time and frequency resource for communicating with the UE 30 among the unoccupied time and frequency resources. When the occupation state of the second frequency resource is a saturated state or the occupied area is greater than a predetermined rate, the first base station 10 may determine not to use the second frequency resource.

[0252] In an embodiment of the present disclosure, the first base station 10 may determine the time and frequency resources for transmitting synchronization information to the UE 30 by using the second frequency resources. The first base station 10 may determine the time and frequency resources for sending a periodic synchronization signal or an aperiodic preamble by using the second frequency resources.

[0253] In an embodiment of the present disclosure, the first base station 10 may determine whether to use at least one of a periodic synchronization signal or an aperiodic preamble to send synchronization information based on the occupancy state of the second frequency resource. For example, when the occupancy state of the second frequency resource is greater than a predetermined rate, the first base station 10 may determine to send an aperiodic preamble instead of a periodic synchronization signal. When the occupancy state of the second frequency resource is less than or equal to a predetermined rate, the first base station 10 may determine to send both a periodic synchronization signal and an aperiodic preamble.

[0254] In operation 1303, the first base station 10 may request the second base station 20 to allow the first base station 10 to use the determined time and frequency resources.

[0255] In operation 1305, the first base station 10 may receive a response to the request from the second base station 20. The second base station 20 may determine whether to allow the first base station 10 to use the time and frequency resources determined by the first base station 10. Operation 1305 may be omitted.

[0256] In operation 1307, the first base station 10 may determine whether to transmit a synchronization signal by using the determined time and frequency resources based on the received response.

[0257] In an embodiment of the present disclosure, when the first base station 10 receives an ACK from the second base station 20 in response to a request, or when the first base station 10 receives a response notifying that the first base station 10 is allowed to use determined time and frequency resources, the first base station 10 can determine to send a synchronization signal by using the determined time and frequency resources.

[0258] Operation 1307 may be omitted. In an embodiment of the present disclosure, the first base station 10 may transmit synchronization information to the UE 30 by using the time and frequency resources determined in operation 1301 without receiving a response from the second base station 20. Alternatively, even when the first base station 10 receives a NACK from the second base station 20 or receives a response notifying that the use of the time and frequency resources determined in operation 1301 is not allowed, the first base station 10 may determine to transmit synchronization information to the UE 30 based on a specific condition. For example, the condition may include a situation where the first base station 10 determines that the communication between the first base station 10 and the UE 30 is urgent.

[0259] At operation 1309, the first base station 10 may transmit setting information for establishing communication through the second frequency resource of the second mobile communication provider to the UE 30. The setting information may include information about time and frequency resources determined by the first base station 10 for communicating with the UE 30 by using the second frequency resource. In addition, the setting information may include information about time and frequency resources determined by the first base station 10 for transmitting synchronization information by using the second frequency resource.

[0260] In operation 1311, the first base station 10 may transmit synchronization information to the UE 30 by using the determined time and frequency resources. The first base station 10 may transmit synchronization information to the UE 30 by transmitting a periodic synchronization signal or an aperiodic preamble using the allocated time and frequency resources.

[0261] In operation 1113, based on the synchronization information and the setting information, the first base station 10 may communicate with the UE 30 through the second frequency resource. Based on the synchronization information received from the first base station 10, the UE 30 may transmit or receive control information or data by using the second frequency resource.

[0262] The details of operations 1303, 1309, and 1313 may correspond to those of the above references. Figure 7 The details of operations 710, 720, and 730 described above. The details of operation 1305 may correspond to those of the above reference Fig.11 Details of operation 1103 are described.

[0263] Fig.14 is a diagram illustrating a method for instructing a UE to monitor a resource region for receiving a synchronization signal according to an embodiment of the present invention, the method being performed by a first base station.

[0264] When the first base station 10 transmits synchronization information for communicating using the second frequency resource to the UE 30 through the aperiodic preamble, the first base station 10 may transmit information about the time and frequency resource at which the aperiodic preamble will be transmitted to the UE 30. The information about the time and frequency resource at which the aperiodic preamble will be transmitted may be included in the setting information transmitted by the first base station 10 to the UE 30. In an embodiment of the present disclosure, the first base station 10 may transmit information about the time and frequency resource that the UE 30 should detect when receiving the aperiodic preamble.

[0265] Reference Fig.14 In 1401, the first base station 10 may send information about a preamble reception window 1410 for the UE 30 to attempt to receive the non-periodic preamble to the UE 30. The preamble reception window 1410 may refer to a time period in which the UE 30 receives a signal transmitted in the second frequency resource region and searches for a non-periodic preamble in order to receive the non-periodic preamble of the first base station 10. The UE 30 may attempt to receive the non-periodic preamble of the first base station 10 through the second frequency resource during the preamble reception window 1410. Alternatively, the first base station 10 may set one or more preamble reception windows and send information about the set one or more preamble reception windows to the UE 30. For example, the UE 30 may attempt to receive the non-periodic preamble of the first base station 10 based on multiple preamble reception windows.

[0266] Reference Fig.14 In 1402, the first base station 10 may send information about a reception attempt period and information about a continuous reception attempt time to the UE 30, so that the UE 30 may attempt to receive the aperiodic preamble through the second frequency resource. The continuous reception attempt time may refer to a duration for receiving a signal transmitted in the second frequency resource region and searching for the aperiodic preamble when the UE 30 attempts to receive the aperiodic preamble once. The UE 30 may blindly detect (1420) the aperiodic preamble of the first base station 10 based on the reception attempt period and the continuous reception attempt time (1402).

[0267] In an embodiment of the present disclosure, the first base station 10 can adjust the length of the non-periodic preamble code reception window, the number of retransmissions, etc. based on the preamble code reception window 1410 of the UE 30 or the reception attempt period and the continuous reception attempt time, thereby increasing the possibility that the UE 30 will receive the non-periodic preamble code.

[0268] Fig.15 The present invention is a flowchart of a method for synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider by sending a first synchronization signal in a first frequency resource of a first mobile communication provider according to an embodiment of the present disclosure.

[0269] Reference Fig.15 In operation 1501, the first base station 10 may send a first synchronization signal to the UE 30 through a first frequency resource of a first mobile communication provider. The first synchronization signal refers to a synchronization signal of the first base station 10 in the first frequency resource. The first synchronization signal may be sent regardless of whether the first base station 10 uses a second frequency resource of a second mobile communication provider.

[0270] In operation 1503, the first base station 10 may transmit, to the UE 30, setting information for establishing communication through the second frequency resource of the second mobile communication provider.

[0271] The details of operation 1305 may correspond to those in the above reference Figure 7 Therefore, the details of operation 720 are omitted in the description of operation 1503. Figure 7 The above description of operation 720.

[0272] Fig.16 is a diagram illustrating a method for synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider through a first synchronization signal transmitted in a first frequency resource of a first mobile communication provider according to an embodiment of the present disclosure.

[0273] However, reference Fig.16 , because the frequency resources are independent and synchronization can be performed independently therethrough, the synchronization information about each frequency resource may be different. Therefore, as described above, the first base station 10 can send the synchronization information of the first base station 10 through the second frequency resource to communicate with the UE 30 by using the second frequency resource.

[0274] However, in the embodiment of the present disclosure, the first base station 10 may send the synchronization information of the first base station 10 in the second frequency resource through the first frequency resource. Fig.16 As shown, the first base station 10 may communicate with the UE 30 through the second frequency resource based on the first synchronization signal, and may not send any synchronization signal other than the first synchronization signal to the UE 30 .

[0275] The condition under which the first base station 10 transmits the synchronization information of the first base station 10 in the second frequency resource through the first frequency resource may be determined differently. For example, when the first frequency resource and the second frequency resource are frequency bands adjacent to each other, the first base station 10 may transmit the synchronization information of the first base station 10 in the second frequency resource through the first frequency resource. However, the condition is not limited to the above example.

[0276] The setting information for establishing communication through the second frequency resource may include information about a method for obtaining synchronization information corresponding to the first base station 10 in the second frequency resource, the method being performed by the UE 30. For example, the setting information may include information set by the UE 30 to obtain the synchronization information of the first base station 10 in the second frequency resource by receiving the first synchronization signal.

[0277] In an embodiment of the present disclosure, each frequency resource is independent, and therefore, the timing at which the first base station 10 transmits / receives a signal in the second frequency resource according to the first synchronization signal transmitted through the first frequency resource may be different from the timing at which the first base station 10 actually transmits / receives a signal through the second frequency resource. Therefore, the first base station 10 may transmit offset information about the difference between the timing of the operation through the second frequency resource according to the first synchronization signal and the timing of the actual operation through the second frequency resource to the UE 30. The offset information may be included in the setting information for establishing communication through the second frequency resource. The UE 30 may obtain synchronization information of the first base station 10 in the second frequency resource based on the first synchronization signal and the offset information.

[0278] In operation 1505, the first base station 10 may communicate with the UE 30 through the second frequency resource based on the first synchronization signal and the setting information. The UE 30 may send control information or data to the first base station 10 based on the first synchronization signal received through the first frequency resource according to the setting information, or receive control information or data from the first base station 10. For example, the UE 30 may communicate with the first base station 10 based on synchronization information of the first base station 10 in the second frequency resource, the synchronization information being obtained based on the first synchronization signal and the offset information.

[0279] In an embodiment of the present disclosure, the first base station 10 may send a fourth synchronization signal including synchronization information of the first base station 10 in the second frequency resource by using the first frequency resource of the first base station 10. Alternatively, the setting information may include information set by the UE to obtain the synchronization information of the first base station 10 in the second frequency resource by receiving the fourth synchronization signal. The setting information may include offset information. The UE 30 may communicate with the first base station 10 based on the fourth synchronization signal and the setting information.

[0280] Fig.17 is a diagram illustrating a method of synchronizing a UE with a first base station through a second synchronization signal transmitted from a second base station so as to communicate using resources of a second mobile communication provider according to an embodiment of the present disclosure.

[0281] Reference Fig.17 In operation 1701, the first base station 10 may transmit setting information for establishing communication through a second frequency resource of a second mobile communication provider to the UE 30.

[0282] The details of operation 1701 may correspond to those of the above reference Figure 7 Therefore, the details of operation 720 are omitted in the description of operation 1701. Figure 7 The above description of operation 720.

[0283] Fig.18 is a diagram illustrating a method of synchronizing a UE with a first base station so as to communicate using resources of a second mobile communication provider through a second synchronization signal transmitted from the second mobile communication provider according to an embodiment of the present disclosure.

[0284] refer to Fig.18 In an embodiment of the present disclosure, the first base station 10 may configure the UE 30 to receive the second synchronization signal of the second base station 20 sent through the second frequency resource, thereby obtaining the synchronization information of the first base station 10. For example, the first base station 10 may not send an additional synchronization signal for communicating with the UE 30 through the second frequency resource. Fig.18 As shown, by using the second synchronization signal of the second base station 20 received through the second frequency resource, the UE 30 can be synchronized with the first base station 10.

[0285] The condition under which the first base station 10 communicates with the UE 30 based on the second synchronization signal may be determined differently. For example, when the second base station 20 transmits the second synchronization signal but does not transmit data, the first base station 10 may be synchronized with the UE 30 and transmit or receive control information or data through the second synchronization signal. However, the condition is not limited to the above example.

[0286] The first base station 10 may receive a second synchronization signal transmitted by the second base station 20 to communicate with the UE 30 based on the second synchronization signal. In addition, the first base station 10 may obtain synchronization information of the second base station 20 from the second base station 20 or a second mobile communication provider. The first base station 10 may receive information about the second synchronization signal, such as transmission timing, transmission cycle, or continuous transmission time of the second synchronization information, based on the received second synchronization signal or the obtained synchronization information of the second base station 20. The first base station 10 may transmit control information or data to the UE 30 or receive control information or data from the UE 30 based on the received second synchronization signal or the obtained synchronization information of the second base station 20.

[0287] The setting information for establishing communication through the second frequency resource may include information about a method for obtaining synchronization information corresponding to the first base station 10 in the second frequency resource, which method is performed by the UE 30. For example, the setting information may include information set by the UE 30 to obtain the synchronization information of the first base station 10 in the second frequency resource by receiving the second synchronization signal. In addition, the setting information may include information about the second synchronization signal. For example, the setting information may include information about the transmission timing and transmission period of the second synchronization signal.

[0288] In an embodiment of the present disclosure, each frequency resource is independent, and therefore, the timing of the signal transmitted / received by the first base station 10 in the second frequency resource according to the second synchronization signal transmitted through the second frequency resource may be different from the timing of the first base station 10 actually transmitting / receiving the signal through the second frequency resource. Therefore, the first base station 10 may send offset information about the difference between the timing of the operation through the second frequency resource according to the second synchronization signal and the timing of the actual operation through the second frequency resource to the UE 30. The offset information may be included in the setting information for establishing communication through the second frequency resource. The UE 30 may obtain the synchronization information of the first base station 10 in the second frequency resource based on the second synchronization signal and the offset information.

[0289] In operation 1703, the first base station 10 may receive a second synchronization signal corresponding to the second base station 20 from the second base station 20 through the second frequency resource. In operation 1705, the UE 30 may receive the second synchronization signal from the second base station 20 through the second frequency resource. The second synchronization signal may be transmitted regardless of whether the first base station 10 uses the second frequency resource of the second mobile communication provider.

[0290] Through the communication based on the continuous reception of the second synchronization signal from the second base station 20, the first base station 10 and the UE 30 can be synchronized with each other in real time.

[0291] In operation 1707 , based on the second synchronization information and the setting information, the first base station 10 may communicate with the UE 30 through the second frequency resource.

[0292] The UE 30 may send control information or data to the first base station 10 through the second frequency resource based on the second synchronization signal received based on the setting information, or receive control information or data from the first base station 10. For example, based on the synchronization information of the first base station 10 in the second frequency resource obtained based on the second synchronization signal and the offset information, the UE 30 may communicate with the first base station 10.

[0293] Fig.19 The invention is a flowchart of a method for indicating an area in which a UE will perform rate matching according to an embodiment of the present invention, wherein the method is performed by a first base station.

[0294] Reference Fig.19 , in operation 1901, the first base station 10 may obtain information about a second synchronization signal corresponding to a second base station 20 of a second mobile communication provider.

[0295] In an embodiment of the present disclosure, the first base station 10 may receive a second synchronization signal sent by the second base station 20. In addition, the first base station 10 may obtain synchronization information of the second base station 20 from the second base station 20 or the second mobile communication provider. The first base station 10 may receive information about the second synchronization signal, such as transmission timing, transmission cycle, or continuous transmission time of the second synchronization information, based on the received second synchronization signal or the obtained synchronization information of the second base station 20.

[0296] In operation 1903 , the first base station 10 may determine a region in which the UE 30 will perform rate matching when the UE 30 receives data from the first base station 10 , based on the information about the second synchronization signal.

[0297] The second frequency resource is a resource managed by the second mobile communication provider, and the signal received by the UE 30 through the second frequency resource may include the second synchronization signal of the second base station 20. Therefore, when the UE 30 performs rate matching related to the signal received through the second frequency resource, when the rate matching is performed on the resource region other than the second synchronization signal, the rate matching can be smoothly performed on the signal received from the first base station 10. When the rate matching is smoothly performed, the probability that the signal transmitted by the first base station 10 will be received by the UE 30 may increase.

[0298] Fig. 20 is a diagram illustrating a method of performing rate matching by a UE according to an embodiment of the present disclosure.

[0299] Reference Fig. 20 In an embodiment of the present disclosure, the first base station 10 may determine to exclude the area where the second synchronization signal is located from the area where the UE 30 performs rate matching based on the information about the second synchronization signal obtained in operation 1901. Fig. 20 In 2001, the first base station 10 may determine that the UE 30 will perform rate matching on the remaining region of the resource region 2020 of the signal received by the UE 30 through the second frequency resource except the second synchronization signal 2010.

[0300] In addition, the second base station 20 may variably adjust the period of the second synchronization signal according to the purpose of reducing signaling overhead, etc. In an embodiment of the present disclosure, when the period of the second synchronization signal is variable, the first base station 10 may determine to exclude the area where the second synchronization signal is located from the area where the UE 30 performs rate matching based on the shortest period among the periods of the second synchronization signal identified by the first base station 10, based on the synchronization information of the second base station 20 obtained.

[0301] In an embodiment of the present disclosure, the first base station 10 may determine that rate matching will be performed by the UE 30 under certain conditions without considering the second synchronization signal. For example, the conditions may include a situation where the first base station 10 or the UE 30 cannot easily identify information about the second synchronization signal 2010. When the information about the second synchronization signal 2010 cannot be easily identified, the first base station 10 and the UE 30 may send or receive control information and data without considering the second synchronization signal. Fig. 20 In 2002 , the first base station 10 may determine that the UE 30 will perform rate matching on the entire resource region 2030 of the signal received by the UE 30 through the second frequency resource without considering the second synchronization signal 2010 in the resource region 2030 .

[0302] At operation 1905 , the first base station 10 may transmit, to the UE 30 , setting information for establishing communication through a second frequency resource of a second mobile communication provider.

[0303] The details of operation 1905 may correspond to those in the above reference Figure 7 Therefore, the details of operation 720 are omitted in the description of operation 1905. Figure 7 The above description of operation 720.

[0304] According to an embodiment of the present disclosure, the setting information for establishing communication through the second frequency resource may include information about a region in which rate matching is to be performed when the UE 30 receives data from the first base station 10. In addition, the setting information may include information related to the second synchronization signal.

[0305] In operation 1907, the first base station 10 may transmit information about the area in which the UE 30 will perform rate matching to the UE 30. The information about the area in which the UE 30 will perform rate matching may be transmitted separately from the setting information transmitted in operation 1905, or may be transmitted in the setting information.

[0306] In operation 1909, the UE 30 and the first base station 10 may communicate with each other through the second frequency resource based on the setting information.

[0307] UE 30 may transmit control information or data to the first base station 10 through the second frequency resource based on the second synchronization signal received based on the setting information, or receive control information or data from the first base station 10. In addition, UE 30 may perform rate matching on a signal received by UE 30 based on the setting information and information about the area in which rate matching is to be performed.

[0308] In an embodiment of the present disclosure, the UE 30 may identify information about the second synchronization signal without receiving information about the second synchronization signal or information about an area where rate matching is performed from the first base station 10. The UE 30 may identify the transmission timing, transmission cycle, and continuous transmission time of the second synchronization signal by receiving the second synchronization signal from the second base station 20. The UE 30 may perform rate matching on a signal received from the first base station 10 through the second frequency resource based on the information about the second synchronization signal identified by the UE 30.

[0309] A method of sharing frequency resources of the first mobile communication provider according to a request from a third base station or a third mobile communication provider, which method is performed by the first base station 10, will be described below.

[0310] Fig.21 is a diagram illustrating a method for sharing frequency resources of a first base station with a third base station according to an embodiment of the present invention, wherein the method is performed by the first base station.

[0311] Reference Fig.21 , in operation 2110, the first base station may receive a request for permission to use a first frequency resource of the first mobile communication provider from a third base station of a third mobile communication provider.

[0312] In an embodiment of the present disclosure, the first base station may perform the above reference Figures 6 to 20 That is, the details of the operation of the first base station in operation 2110 may correspond to Figure 7 The details of the operation of the second base station in operation 710 are described above, and therefore will not be repeated here.

[0313] In an embodiment of the present disclosure, the first base station may receive a request for permission to use the first frequency resource not only from the third base station but also from a server of a third mobile communication provider or a base station different from the third base station.

[0314] In operation 2120, the first base station may determine whether to allow the third base station to use the first frequency resource based on the request from the third base station. Details of the operation of the first base station in operation 2120 may correspond to Fig.11The details of the operation of the second base station in operation 1103 are not described here, so they are not described again. That is, the first base station can determine whether to allow the third base station to use the first frequency resource based on the occupation status of the first frequency resource.

[0315] In one embodiment of the present disclosure, the first base station may send a response to the request from the third base station. Alternatively, the first base station may allocate time and frequency resources to the third base station so that the first base station communicates with the UE subscribed to the third mobile communication provider through the first frequency resources. Figures 6 to 20 The operations of the second base station described as corresponding to the first base station may be inferred and applied to the operations of the first base station corresponding to the third base station.

[0316] Fig. 22 The present invention is a flowchart of a method for communicating with a first base station of a first mobile communication provider by using frequency resources of a second mobile communication provider according to an embodiment of the present disclosure, the method being performed by a UE.

[0317] Reference Fig. 22 In operation 2210, the UE may receive setting information for establishing communication using the second frequency resource of the second mobile communication provider through the first frequency resource of the first mobile communication provider. For example, the UE may receive setting information for establishing communication using the second frequency resource from the first base station of the first mobile communication provider. Figures 6 to 20 The setting information and the method for UE to receive the setting information are described, and thus the related description is omitted.

[0318] In operation 2220, the UE may obtain synchronization information corresponding to the first base station based on the received setting information. For example, the UE may obtain synchronization information of the first base station in the second frequency resource based on a method for obtaining synchronization information, which is included in the setting information. Figure 1 A method for obtaining synchronization information by a UE is described. 6 to 20 and their descriptions are omitted.

[0319] In operation 2230, the UE may communicate with the first base station through the second frequency resource based on the obtained synchronization information. The UE may send control information or data to the first base station through the second frequency resource or receive control information or data from the first base station based on the synchronization information and the setting information. The UE may receive a second synchronization signal of the second base station and communicate with the first base station based on the second synchronization signal. In addition, the UE may perform rate matching on a signal received through the second frequency resource based on at least one of the setting information or the second synchronization signal.

[0320] Fig.23is a diagram illustrating a method of storing synchronization information of a target base station by identifying identification information of a mobile communication provider included in the synchronization information according to an embodiment of the present disclosure, the method being performed by a UE.

[0321] Reference Fig.23 In operation 2301, the UE may set the MNO ID of the target base station. The MNO ID may refer to identification information of a mobile communication provider that provides a communication service subscribed by the UE. The target base station may include one or more base stations.

[0322] In operation 2303, the UE may receive a signal including synchronization information. The signal including synchronization information may include at least one of a periodic synchronization signal or an aperiodic preamble. The signal including synchronization information may include an MNO ID of a mobile communication provider that controls a base station that transmits a signal.

[0323] In operation 2305, the UE may determine whether the MNO ID in the received synchronization information is the same as the MNO ID of the target base station.

[0324] When the MNO ID in the received synchronization information is not identical to the MNO ID of the target base station, the UE may return to operation 2303 and attempt to receive a signal including the synchronization information.

[0325] When the MNO ID in the received synchronization information is the same as the MNO ID of the target base station, the UE may store the received synchronization information at operation 2307. The UE may determine that the base station sending the synchronization information is the target base station. The UE may communicate with the target base station based on the stored synchronization information.

[0326] Fig.24 is a block diagram showing a configuration of a base station according to an embodiment of the present invention.

[0327] As above reference Figures 1 to 23 The configuration of the base station may correspond to Fig.24 For example, the configuration of each of the first base station 10, the second base station 20 and the third base station may correspond to Fig.24 The configuration of the base station.

[0328] refer to Fig.24 , the base station may include a transceiver 2410, a memory 2420, and a processor 2430. The transceiver 2410, the memory 2420, and the processor 2430 of the base station may operate according to the communication method of the base station as described above. However, the components of the base station are not limited to the above examples. For example, the base station may include more components or fewer components than the above components. In addition, the transceiver 2410, the memory 2420, and the processor 2430 may be implemented as one chip. The processor 2430 may include one or more processors.

[0329] The transceiver 2410 may send and receive signals to and from the UE and other base stations. Here, the signal may include control information and data. To this end, the transceiver 2410 may include: a radio frequency (RF) transmitter that up-converts and amplifies the signal to be transmitted; an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency of the signal, etc. However, the above description is intended only to provide an embodiment of the transceiver 2410, and the components of the transceiver 2410 are not limited to the RF transmitter and the RF receiver.

[0330] In addition, the transceiver 2410 may receive a signal through a wireless channel, output the signal to the processor 2430 , and transmit a signal output from the processor 2430 through a wireless channel.

[0331] The memory 2420 may store programs and data necessary for operating the base station. In addition, the memory 2420 may store control information or data included in a signal obtained by the base station. The memory 2420 may include a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of these storage media.

[0332] The processor 2430 may control a series of processes to operate the base station according to the above-mentioned embodiment of the present disclosure. In the embodiment of the present disclosure, the processor 2430 may control: performing scheduling to allocate time domain resources for data channels, and sending control information about allocation of time domain resources for data channels to the UE.

[0333] In an embodiment of the present disclosure, the processor 2430 can control: requesting permission for the first base station to use the second frequency resources of the second mobile communication provider; sending setting information for setting up communication using the second frequency resources of the second mobile communication provider to the UE through the first frequency resources of the first mobile communication provider; and communicating with the UE through the second frequency resources based on the setting information.

[0334] In an embodiment of the present disclosure, the processor 2430 may control: receiving a response to a request for permission to use the second frequency resource, and sending setting information based on the received response.

[0335] In an embodiment of the present disclosure, when NACK regarding a request is not received, the processor 2430 may determine that the request is allowed.

[0336] In an embodiment of the present disclosure, the setting information may include information about a method for the UE to obtain synchronization information corresponding to the first base station, and the synchronization information may be obtained through at least one of a periodic synchronization signal or a non-periodic preamble code, and include identification information of the first mobile communication provider.

[0337] In an embodiment of the present disclosure, identification information may be uniquely predetermined for a first mobile communication provider to distinguish between a plurality of mobile communication providers, or identification information may be allocated from a second base station of a second mobile communication provider to a first base station, and the processor 2430 may control the sending of identification information of the first mobile communication provider to the UE.

[0338] In an embodiment of the present disclosure, the processor 2430 can control the first base station to: request a second base station of a second mobile communication provider to allocate time and frequency resources to communicate with the UE through the second frequency resources, be allocated time and frequency resources from the second base station, send a periodic synchronization signal or a non-periodic preamble code to the UE by using the allocated time and frequency resources, and communicate with the UE based on the synchronization information included in the periodic synchronization signal or the non-periodic preamble.

[0339] In an embodiment of the present disclosure, the setting information may include information about a method for the UE to obtain synchronization information corresponding to the first base station, and the synchronization information may be obtained based on a first synchronization signal corresponding to the first base station sent via a first frequency resource or a second synchronization signal corresponding to a second base station of a second mobile communication provider sent via a second frequency resource.

[0340] In an embodiment of the present disclosure, the information about the method of obtaining synchronization information may include the first or second synchronization signal and information about the offset between synchronization information segments used to enable the UE to communicate with the first base station through the second frequency resource.

[0341] In an embodiment of the present disclosure, the processor 2430 may control: obtaining information about a second synchronization signal corresponding to a second base station of a second mobile communication provider, determining an area in which rate matching is to be performed when the UE receives data from the first base station based on the second synchronization signal, and sending information about the area in which rate matching is to be performed to the UE. And the information about the second synchronization signal may include information about the transmission timing of the second synchronization signal and information about the transmission period of the second synchronization signal.

[0342] In an embodiment of the present disclosure, the processor 2430 may receive a request for permission to use the first frequency resources of the first mobile communication provider from a third base station of a third mobile communication provider, and determine whether to allow the third base station to use the first frequency resources based on the request.

[0343] Fig.25 is a block diagram showing the configuration of a UE according to an embodiment of the present invention.

[0344] Reference Fig.25, the UE may include a transceiver 2510, a memory 2520, and a processor 2530. The transceiver 2510, the memory 2520, and the processor 2530 of the UE may operate according to the communication method of the UE as described above. However, the components of the UE are not limited to the above examples. For example, the UE may include more components or fewer components than the above components. Alternatively, the transceiver 2510, the memory 2520, and the processor 2530 may be implemented as one chip. The processor 52430 may include one or more processors.

[0345] The transceiver 2510 may send and receive signals to and from a base station. Here, the signal may include control information and data. To this end, the transceiver 2510 may include: an RF transmitter, which up-converts and amplifies the signal to be transmitted; an RF receiver, which low-noise amplifies the received signal and down-converts the frequency of the signal, etc. However, the above description is intended only to provide an embodiment of the transceiver 2510, and the components of the transceiver 2510 are not limited to the RF transmitter and the RF receiver.

[0346] In addition, the transceiver 2510 may receive a signal through a wireless channel, output the signal to the processor 2530, and transmit a signal output from the processor 2530 through a wireless channel.

[0347] The memory 2520 may store programs and data necessary for operating the UE. In addition, the memory 2420 may store control information or data included in a signal obtained by the UE. The memory 2520 may include a storage medium such as ROM, RAM, hard disk, CD-ROM and DVD, or a combination of these storage media.

[0348] The processor 2530 may control a series of processes to operate the UE base station according to the above-mentioned embodiment of the present disclosure. In the embodiment of the present disclosure, the processor 2530 may control to: receive control information about allocating time domain resources to the data channel from the base station, and determine to allocate time domain resources to the data channel based on the received control information.

[0349] In an embodiment of the present disclosure, the processor 2530 may be controlled to: receive setting information through a first frequency resource of a first mobile communication provider, for setting up communication using a second frequency resource of a second mobile communication provider, obtain synchronization information corresponding to the first base station based on the received setting information, and communicate with the first base station through the second frequency resource based on the obtained synchronization information. The setting information may include information about a method for obtaining synchronization information, and the synchronization information may include identification information of the first mobile communication provider.

[0350] The method according to the embodiments of the present disclosure described in the claims or specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0351] When the method is implemented by software, a non-transitory, semi-transitory or transient computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the non-transitory computer-readable storage medium are configured to be executed by one or more processors included in the electronic device. One or more programs include instructions for causing the electronic device to perform the method according to the embodiments set forth in the claims or specification of the present disclosure.

[0352] Such a program (software module or software) may be stored in a random access memory, a non-volatile memory such as a flash memory, a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disk storage device, a compact disk ROM (CD-ROM), a digital versatile disk (DVD), other types of optical storage devices or a magnetic tape cassette. In addition, such a program may be stored in a memory that is a combination of some or all of the above storage media. Alternatively, a plurality of such memories may be provided.

[0353] The program may be stored in an attachable storage device accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide area network (WLAN), or a storage area network (SAN) or a combination thereof. Such a storage device may be connected to the equipment performing the embodiments of the present disclosure via an external port. In addition, a separate storage device in the communication network may be connected to the equipment performing the embodiments of the present disclosure.

[0354] In the embodiments of the above disclosure, the various components included in the disclosure are expressed in singular or plural form, depending on the embodiment presented. However, singular or plural expression is appropriately selected according to the situation described for the convenience of description, and the present invention is not limited to singular or plural components. Even components expressed in plural form can also be embodied in singular form, or even components expressed in singular form can also be embodied in plural form.

[0355] The embodiments of the present disclosure set forth in this specification and the accompanying drawings are intended only to provide examples that are easy to explain the technical problems of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those of ordinary skill in the art that other modified examples based on the technical spirit of the present disclosure can be implemented. These embodiments can be implemented in combination as needed. For example, a base station and a UE can be operated according to a combination of a part of an embodiment of the present disclosure and a part of another embodiment of the present disclosure. In addition, the embodiments of the present disclosure can be applied to other communication systems, and other modifications based on the technical spirit of the embodiments can also be implemented.

[0356] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims

1. A method for communicating with a user equipment by using frequency resources of a second mobile communication provider in a mobile communication system, the method being performed by a first base station of a first mobile communication provider, the method comprising: Requesting permission for the first base station to use a second frequency resource of the second mobile communication provider; Sending, to the user equipment, setting information for establishing communication using the second frequency resource of the second mobile communication provider, through the first frequency resource of the first mobile communication provider; as well as Based on the setting information, communicating with the user equipment through the second frequency resource, The setting information includes information about a method for the user equipment to obtain synchronization information corresponding to the first base station, and The synchronization information is obtained through at least one of a periodic synchronization signal or a non-periodic preamble code, and includes identification information of the first mobile communication provider.

2. The method according to claim 1, further comprising: receiving a response to the permission request, and The sending of the setting information includes sending the setting information based on the received response. 3 . The method of claim 1 , further comprising, unless a negative acknowledgement (NACK) is received for the grant request, determining that the request is granted.

4. The method according to claim 1, in, The identification information is predetermined to be uniquely used for the first mobile communication provider to distinguish between a plurality of mobile communication providers or is allocated to the first base station by a second base station of the second mobile communication provider, and The method further includes: sending identification information of the first mobile communication provider to the user equipment.

5. The method according to claim 1, further comprising: Requesting a second base station of the second mobile communication provider to allocate to the first base station time and frequency resources for communicating with the user equipment using the second frequency resources; receiving the allocation of the time and frequency resources from the second base station; as well as sending the periodic synchronization signal or the aperiodic preamble to the user equipment by using the allocated time and frequency resources, and The communicating with the user equipment includes: communicating with the user equipment based on the synchronization information included in the periodic synchronization signal or the non-periodic preamble.

6. The method according to claim 1, in, The synchronization information is obtained based on a first synchronization signal transmitted through the first frequency resource or a second synchronization signal transmitted through the second frequency resource, and The first synchronization signal corresponds to the first base station, and the second synchronization signal corresponds to the second base station of the second mobile communication provider.

7. The method according to claim 6, the information about the method of obtaining the synchronization information includes information about an offset between the first or second synchronization signal and synchronization information used to enable the user equipment to communicate with the first base station through the second frequency resource.

8. The method according to claim 1, further comprising: obtaining information about a second synchronization signal corresponding to a second base station of the second mobile communication provider; determining, based on information about the second synchronization signal, a region in which rate matching is to be performed when the user equipment receives data from the first base station; as well as sending information about a region in which rate matching is to be performed to the user equipment, The information about the second synchronization signal includes information about the transmission timing of the second synchronization signal and information about the transmission period of the second synchronization signal.

9. The method according to claim 1, further comprising: receiving, from a third base station of a third mobile communication provider, a request for permission to use the first frequency resource of the first mobile communication provider; as well as Based on the request from the third base station, it is determined whether to permit the third base station to use the first frequency resource.

10. A method for communicating with a first base station of a first mobile communication provider by using frequency resources of a second mobile communication provider in a wireless communication system, the method being performed by a user equipment, the method comprising: receiving, via the first frequency resource of the first mobile communication provider, setting information for establishing communication using the second frequency resource of the second mobile communication provider; Based on the received setting information, obtaining synchronization information corresponding to the first base station; as well as communicating with the first base station through the second frequency resource based on the acquired synchronization information, The setting information includes information about a method for obtaining the synchronization information, and The synchronization information includes identification information of the first mobile communication provider.

11. A first base station of a first mobile communication provider, which communicates with a user equipment by using frequency resources of a second mobile communication provider in wireless communication, the first base station comprising: Transceiver; Memory; as well as at least one processor configured to control: requesting permission for the first base station to use a second frequency resource of the second mobile communication provider, transmitting, to the user equipment, setting information for establishing communication through the second frequency resource of the second mobile communication provider by using the first frequency resource of the first mobile communication provider, and Based on the setting information, communicating with the user equipment through the second frequency resource, The setting information includes information about a method for the user equipment to obtain synchronization information corresponding to the first base station, and The synchronization information is obtained through at least one of a periodic synchronization signal or a non-periodic preamble code, and includes identification information of the first mobile communication provider.

12. The first base station according to claim 11, wherein: The at least one processor is further configured to control: receiving a response to the permission request, and The setting information is sent based on the received response. 13 . The first base station of claim 11 , wherein the at least one processor is further configured to determine that the grant request is granted unless a negative acknowledgement (NACK) is received for the grant request.

14. A user equipment for communicating with a first base station of a first mobile communication provider by using a second frequency resource of a second mobile communication provider in a wireless communication system, the user equipment comprising: Transceiver; Memory; as well as at least one processor configured to control: receiving, through the first frequency resource of the first mobile communication provider, setting information for establishing communication using the second frequency resource of the second mobile communication provider, obtaining synchronization information corresponding to the first base station based on the received setting information, and communicating with the first base station through the second frequency resource based on the acquired synchronization information, The setting information includes information about a method for obtaining the synchronization information, and The synchronization information includes identification information of the first mobile communication provider.

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