Base station, wireless communication method, and wireless communication system

Abstract

To appropriately reduce interference in wireless communication.SOLUTION: A base station includes: a receiving unit that receives information indicating first radio quality of a first terminal residing in a first cell and information indicating second radio quality of a second terminal residing in the first cell; a control unit that determines a frequency resource to be allocated to the first terminal among frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; and a transmitting unit that transmits information indicating the frequency resource determined by the control unit to the first terminal.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a base station, a wireless communication method, and a wireless communication system.

Background Art

[0002] In a mobile communication system, a user terminal (UE, User Equipment) and a radio base station perform data transmission and reception by wireless communication. The coverage (cell) range of a radio base station is limited. Therefore, by multiple radio base stations complementing each other's coverage, wireless communication by user terminals in a wider range of locations is made possible.

[0003] Patent Document 1 describes a technique for reducing interference while increasing the frequency utilization efficiency compared to a 6-sector cell in which different frequencies are assigned among six adjacent sectors. In the technique described in Patent Document 1, each cell is divided into six sectors, an inner circle, and an outer circle. Then, different frequencies are assigned to the terminal device within the inner circle and within the outer circle of each sector, and the frequency assigned within the outer circle of a certain sector is also assigned within the inner circles of the two sectors adjacent to that sector.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique described in Patent Document 1, for example, when there is a bias in the positions of a plurality of user terminals located within a cell, there is a problem that the frequency utilization efficiency decreases.

[0006] An object of the present disclosure is to provide a base station, a wireless communication method, and a wireless communication system that can appropriately reduce interference in wireless communication in view of the above-described problems.

Means for Solving the Problems

[0007] In a first aspect according to the present disclosure, a base station includes: a receiving unit that receives information indicating a first radio quality of a first terminal located in a first cell and information indicating a second radio quality of a second terminal located in the first cell; a control unit that determines a frequency resource to be allocated to the first terminal among frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; and a transmitting unit that transmits information indicating the frequency resource determined by the control unit to the first terminal.

[0008] Further, in a second aspect according to the present disclosure, a base station executes: a process of receiving information indicating a first radio quality of a first terminal located in a first cell and information indicating a second radio quality of a second terminal located in the first cell; a process of determining a frequency resource to be allocated to the first terminal among frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; and a process of transmitting information indicating the frequency resource determined by the control unit to the first terminal.

[0009] Further, in a third aspect according to the present disclosure, a wireless communication system includes a base station and a terminal. The base station includes: a receiving unit that receives information indicating a first radio quality of a first terminal located in a first cell and information indicating a second radio quality of a second terminal located in the first cell; a control unit that determines a frequency resource to be allocated to the first terminal among frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; and a transmitting unit that transmits information indicating the frequency resource determined by the control unit to the first terminal. The terminal performs wireless communication in at least one of a downlink and an uplink using the frequency resource allocated to the base station.

Effects of the Invention

[0010] According to one aspect, interference in wireless communication can be appropriately reduced.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0012] The principles of the present disclosure are described with reference to several exemplary embodiments. These embodiments are described for illustrative purposes only and are intended to help those skilled in the art understand and implement the present disclosure without suggesting any limitations on the scope of the present disclosure. The disclosure described herein may be implemented in various ways other than those described below.

[0013] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <System Configuration> FIG. 1 is a diagram showing a configuration example of a wireless communication system 1 according to an embodiment. In FIG. 1, the wireless communication system 1 includes base stations 10A to 10N (hereinafter, simply referred to as "base station 10" when there is no need to particularly distinguish), terminals 20A to 20M (hereinafter, simply referred to as "terminal 20" when there is no need to particularly distinguish), and a network N. Note that the numbers of the base stations 10 and the terminals 20 are not limited to the example in FIG. 1.

[0015] The base station 10 and the terminal 20 are connected so as to be able to communicate by wireless communication such as, for example, the fifth-generation mobile communication system (5G), the fourth-generation mobile communication system (4G), or wireless LAN (Local Area Network). Note that the range (coverage) in which the terminal 20 can receive radio waves from the base station 10 is also referred to as a cell.

[0016] Note that the term "base station" (BS: Base Station) used in the present disclosure refers to a device that can provide or host a cell or coverage with which the terminal 20 can communicate. Examples of the base station 10 include, for example, gNB (NR Node B), Node B (NodeB or NB), Evolved Node B (eNodeB or eNB), Remote Radio Unit (RRU), and the like. Further, examples of the base station 10 include, for example, Radio Head (RH), Remote Radio Head (RRH), and low-power nodes (for example, femto nodes, pico nodes), but are not limited thereto.

[0017] As used herein, the term "terminal" refers to any device having a wireless or wired communication function. Examples of the terminal 20 include a user equipment (UE), a personal computer, a desktop, a mobile phone, a cellular phone, a smartphone, a wearable device, a personal digital assistant (PDA), etc. Further, examples of the terminal 20 include a portable computer, an image capture device such as a digital camera, a game device, a music storage and playback device, or an Internet device that enables Internet access and browsing, etc.

[0018] The communication (wireless communication) described in the present disclosure may comply with standards such as 5G (5th generation mobile communication system, NR: New Radio), 4G (4th generation mobile communication system), 3G (3rd generation mobile communication system), etc. Note that 4G may include, for example, LTE (Long Term Evolution) advanced, WiMAX2, LTE. Further, the wireless communication described in the present disclosure may comply with standards such as wideband code division multiple access (W-CDMA), code division multiple access (CDMA), global system for mobile (GSM) for vehicle communication, and wireless local area network (LAN). Also, the wireless communication of the present disclosure may be executed according to any generation of wireless communication protocol known currently or developed in the future. Note that the "downlink" used in the present disclosure refers to the link from the base station 10 to the terminal 20, and the "uplink" refers to the link from the terminal 20 to the base station 10.

[0019] <Configuration> Next, referring to FIGS. 2 and 3, the configurations of the base station 10 and the terminal 20 according to the embodiment will be described. FIG. 2 is a diagram showing an example of the configuration of the base station 10 according to the embodiment. FIG. 3 is a diagram showing an example of the configuration of the terminal 20 according to the embodiment. Note that the configurations shown in FIGS. 2 and 3 are merely examples. As long as the processing of the present disclosure can be executed, the names of the respective parts may be any names.

[0020] <<Base Station 10>> The base station 10 includes a transmission unit 11, a reception unit 12, and a control unit 13. The transmission unit 11 converts digital data into radio waves according to the instruction of the control unit 13 and transmits the radio waves from the antenna to the terminal 20. The transmission unit 11 may be realized by, for example, a radio unit (RU). The reception unit 12 receives the radio waves transmitted from the terminal 20 by the antenna and converts the received radio waves into digital signals. The control unit 13 performs various controls. The control unit 13 performs, for example, various processes for the base station 10 to perform wireless communication with the terminal 20.

[0021] Note that the base station 10 may have a plurality of transmission units 11. In this case, each transmission unit 11 forms a cell respectively.

[0022] <<Terminal 20>> The terminal 20 includes a transmission unit 21, a reception unit 22, and a control unit 23. The transmission unit 21 converts digital data into radio waves according to the instruction of the control unit 23 and transmits the radio waves from the antenna to the base station 10. The reception unit 22 receives the radio waves transmitted from the base station 10 by the antenna and converts the received radio waves into digital signals. The control unit 23 performs various controls. The control unit 23 performs, for example, various processes for the terminal 20 to perform wireless communication with the base station 10.

[0023] <Processing> Next, referring to FIG. 4, an example of the processing of the wireless communication system 1 according to the embodiment will be described. FIG. 4 is a sequence diagram showing an example of the processing of the wireless communication system 1 according to the embodiment. FIG. 5 is a diagram showing an example of the terminal information management DB 501 according to the embodiment. FIG. 6 is a diagram showing an example of the cell setting information 601 according to the embodiment. FIG. 7 is a diagram showing an example of the position and range of the cell according to the embodiment. FIGS. 8 and 9 are diagrams for explaining an example of the processing of allocating frequency resources according to the embodiment.

[0024] In step S1-1, the terminal 20A transmits information indicating the radio quality in the cell 1 in which it is located (information indicating the distance (divergence) from the center of the cell 1 in which it is located to the terminal 20A) to the base station 10. Here, the terminal 20A may execute the processing of step S1-1, for example, when the area in which it is located is changed and at a predetermined timing such as regularly.

[0025] Also, in step S1-2, the terminal 20B transmits information indicating the radio quality in the cell 1 in which it is located to the base station 10. In steps S1-1 and S1-2, the terminal 20 may transmit the identification information of the cell in which the terminal 20 is located to the base station 10. Further, the base station 10 may determine the identification information (cell ID) of the cell in which it is located based on the signal transmitted and received with the terminal 20 on the RACH (Random Access Channel) during random access processing for initial access, timing control, etc., for example.

[0026] The information indicating the radio quality of the terminal 20 may include, for example, channel state information (CSI). Note that CSI is information transmitted (fed back) from the terminal 20 to the base station 10 when performing downlink wireless communication. Also, the information indicating the radio quality of the terminal 20 may include the signal power to interference power ratio (SIR) for the uplink or downlink with respect to the terminal 20. Further, the information indicating the radio quality of the terminal 20 may include information indicating the transmission power of radio waves for the uplink or downlink with respect to the terminal 20. Additionally, the information indicating the radio quality of the terminal 20 may include information indicating the current position of the terminal 20.

[0027] Subsequently, the base station 10 records in the terminal information management DB (database) 501 the radio quality in the cell where each terminal 20 is located (step S2). Here, the base station 10 may determine (calculate) the radio quality in the cell where the terminal 20 is located based on, for example, the information indicating the radio quality received from the terminal 20.

[0028] When the base station 10 uses CSI to determine the radio quality of the terminal 20, for example, the higher the quality of the wireless communication indicated by the CSI, the higher the value of the radio quality of the terminal 20 may be determined. Thereby, for example, the higher the quality of the wireless communication, the closer the position of the terminal 20 is determined to be to the center of the cell.

[0029] When the base station 10 uses the SIR in the uplink or downlink to determine the radio quality of the terminal 20, for example, the higher the quality of the wireless communication indicated by the SIR, the higher the value of the radio quality of the terminal 20 may be determined. Thereby, for example, the higher the quality of the wireless communication, the closer the position of the terminal 20 is determined to be to the center of the cell. Note that the base station 10 may measure the SIR from, for example, the average and variance of the despreading result of the pilot signal.

[0030] Also, when the base station 10 uses the transmission power in the uplink or downlink for determining the radio quality of the terminal 20, for example, the lower the transmission power, the higher the value of the radio quality of the terminal 20 may be determined. Thereby, for example, the closer the position of the terminal 20 is to the center of the cell, the lower the transmission power of the wireless communication is determined. Note that the base station 10 may specify, for the uplink, the transmission power such that the measured value of the SIR matches the target value, for example, to the terminal 20. Then, the terminal 20 may transmit data to the base station 10 with the transmission power specified by the base station 10. Also, the base station 10 may transmit radio waves to the terminal 20 with the transmission power such that the measured value of the SIR matches the target value, for example, for the downlink.

[0031] Also, when the base station 10 uses the current position of the terminal 20 for determining the radio quality of the terminal 20, for example, it may receive from the terminal 20 the current position calculated using a satellite positioning system such as GPS (Global Positioning System) at the terminal 20. Then, the base station 10 may determine the higher the value of the radio quality of the terminal 20, the smaller the difference between the center position of the cell registered in advance in the base station 10 and the current position of the terminal 20.

[0032] In the example of FIG. 5, in the terminal information management DB501 of the base station 10, the cell ID and the radio quality information of the terminal 20 are recorded in association with the terminal ID. The terminal ID is the identification information of the terminal 20. The cell ID is the identification information of the cell in which the terminal 20 is located. In the example of FIG. 5, as the value of the radio quality of the terminal 20, a numerical value in the range from 0 to 99 is recorded.

[0033] Subsequently, the base station 10 determines the frequency resources to be allocated to the terminal 20 based on the information recorded in the terminal information management DB501 and the cell setting information 601 (step S3). Note that the base station 10 may execute the process of step S3, for example, when the area where the terminal 20 is located is changed, when data transmission / reception in the uplink or downlink is requested from the terminal 20, and at a predetermined timing such as periodically.

[0034] In the cell configuration information 601, when at least a part of the available frequency resources is the same between the first cell (a specific cell) and the second cell (another cell) adjacent to the first cell, the allocation pattern of the frequency resources is set to be different. Note that the cell configuration information 601 may be registered in advance in the base station 10. Also, the base station 10 may receive records of the cell IDs, frequency resources, and allocation patterns of the frequency resources of other base stations 10 from other base stations 10 or the like and register them in the cell configuration information 601. In this case, the base station 10 may determine at least one of the frequency resources of the cells of the base station 10 and the allocation pattern of the frequency resources to be different from the frequency resources and the allocation pattern of the frequency resources of other base stations 10 adjacent to the base station 10.

[0035] In the example of FIG. 6, in the cell configuration information 601, a frequency resource and an allocation pattern of the frequency resource are recorded in association with the cell ID. The frequency resource is a frequency resource that can be used for uplink or downlink wireless communication with the terminal 20 in the cell related to the cell ID. The frequency resource includes, for example, a frequency band.

[0036] The allocation pattern of the frequency resources may include a pattern A (an example of the "first pattern") that allocates a higher frequency as the relative height between the radio qualities of a plurality of terminals 20 is lower, and a pattern B (an example of the "second pattern") that allocates a lower frequency as the relative height is lower. In pattern A, among a plurality of terminals 20 located in a specific cell, for a terminal 20 with relatively low radio quality, a frequency resource of a relatively high frequency (the first frequency) among the frequency resources of the cell is allocated. Also, among a plurality of terminals 20 located in the cell, for a terminal 20 with relatively high radio quality, a frequency resource of a relatively low frequency (a second frequency lower than the first frequency) among the frequency resources of the cell is allocated.

[0037] Also, in pattern B, among the plurality of terminals 20 located in a specific cell, for the terminals 20 with relatively low radio quality, frequency resources of a relatively low frequency (third frequency) among the frequency resources of the cell are allocated. Also, among the plurality of terminals 20 located in the cell, for the terminals 20 with relatively high radio quality, frequency resources of a relatively high frequency (fourth frequency higher than the third frequency) among the frequency resources of the cell are allocated.

[0038] FIG. 7 shows an example of the positions and ranges of the cells related to each cell ID recorded in the cell setting information 601 of FIG. 6. In the examples of FIGS. 6 and 7, a plurality of cells in which at least a part of the available frequency resources are the same and the frequency resource allocation patterns are the same are set so as not to be adjacent to each other. Thereby, the occurrence frequency of interference between adjacent cells can be reduced.

[0039] Cells 701 to 720 in FIG. 7 are cells whose cell IDs recorded in the cell setting information 601 of FIG. 6 are cells 701 to 720, respectively. Hereinafter, as an example, cell 707 in FIG. 7 will be described. In the example of FIG. 7, cell 707 is adjacent to cells 702, 703, 706, 708, 712, and 713. And in the example of FIG. 6, the frequency resources of cells 706 to 708 are the same frequency resource B, and the frequency resources of cells 702, 703, 712, and 713 are frequency resource A. Since cells 702, 703, 712, and 713 have different frequency resources from cell 707, interference with cell 707 can be reduced.

[0040] Also, although cells 706 and 708 have the same frequency resources as cell 707, since the frequency resource allocation patterns are different from that of cell 707, interference with cell 707 can be reduced.

[0041] FIG. 8 shows an example in which the terminals 20A and 20B are located in the cell 707 in which the pattern B shown in FIGS. 6 and 7 is set, and the terminals 20C and 20D are located in the cell 708 in which the pattern A is set. In the example of FIG. 8, the distance 801 from the center 7070 of the cell 707 to the terminal 20A is closer (smaller) than the distance 802 from the center 7070 to the terminal 20B. Also, the distance 811 from the center 7080 of the cell 708 to the terminal 20C is farther (larger) than the distance 812 from the center 7080 to the terminal 20D.

[0042] In this case, the base station 10 allocates frequency resources to the terminals 20A and 20B located in the cell 707 based on the pattern B. In this case, the base station 10 allocates a relatively high (higher frequency) first frequency resource among the frequency resources available in the cell 707 to the terminal 20A, which has relatively high radio quality (the distance from the center of the cell 707 is relatively close). Similarly, the base station 10 allocates a relatively low (lower frequency) second frequency resource among the frequency resources available in the cell 707 to the terminal 20B. In this case, the second frequency resource is a resource block (RB) or the like in a frequency band lower than the first frequency resource.

[0043] In addition, the base station 10 allocates frequency resources to the terminals 20C and 20D located within the cell 708 based on pattern A. In this case, the base station 10 allocates a relatively high third frequency resource among the frequency resources available in the cell 708 to the terminal 20C with relatively low radio quality (relatively far from the center of the cell 708) among the terminals 20C and 20D. Similarly, the base station 10 allocates a relatively low fourth frequency resource among the frequency resources available in the cell 708 to the terminal 20D. In this case, the fourth frequency resource is a resource block or the like in a frequency band lower than that of the third frequency resource. Thereby, for example, the possibility of using the same frequency near the edge of the cell is reduced, and the interference between the terminals 20 is reduced (suppressed), so that the communication quality can be improved.

[0044] FIG. 9 shows an example in FIG. 8 where the terminal 20E further locates within the cell 707 due to the power-on or position movement of the terminal 20E. In the example of FIG. 9, the distance 803 from the center 7070 to the terminal 20E is closer (smaller) than the distance 801 from the center 7070 to the terminal 20A and the distance 802 from the center 7070 to the terminal 20B.

[0045] In this case, the base station 10 allocates frequency resources to the terminals 20A, 20B, and 20E located within the cell 707 based on pattern B. In this case, the base station 10 allocates a relatively high fifth frequency resource among the frequency resources available in the cell 707 to the terminal 20E with the highest radio quality (closest to the center of the cell 708) among the terminals 20A, 20B, and 20E according to pattern B. Also, the base station 10 allocates a sixth frequency resource with a frequency lower than that of the fifth frequency resource among the frequency resources available in the cell 707 to the terminal 20A. Further, the base station 10 allocates a seventh frequency resource with a frequency lower than that of the sixth frequency resource among the frequency resources available in the cell 707 to the terminal 20B.

[0046] When allocating frequency resources according to the radio quality (distance from the center of the cell) of a certain terminal as in Patent Document 1, for example, when there is a bias in the number of terminals 20 in the vicinity of the center of the cell and the vicinity of the edge of the cell, a division loss of the frequency band occurs. Therefore, the utilization efficiency of the frequency decreases. On the other hand, in the present disclosure, as described above, since the frequency resources are allocated according to the relative high and low levels among the radio qualities of a plurality of terminals 20 in the cell, the frequency resources allocated to the cell can be used more efficiently.

[0047] Subsequently, the base station 10 transmits information indicating the determined frequency resources to the terminal 20 (step S4). Subsequently, the terminal 20 sets the frequency resources specified by the base station 10 as the frequency resources for wireless communication with the base station 10 (step S5). Subsequently, the base station 10 and the terminal 20 perform wireless communication in at least one of the downlink and the uplink using the frequency resources (step S6). As a result, the terminal 20 can receive or transmit data in at least one of the downlink and the uplink using the frequency resources allocated by the base station 10.

[0048] Hereinafter, modified examples of the embodiments of the present disclosure will be described. Each of the following modified examples may be implemented in appropriate combination with the embodiments of the present disclosure.

[0049] <Modification Example 1> In the above-described embodiment, as an example of the frequency resource allocation pattern by the base station 10, an example of using Pattern A in which a higher frequency is allocated as the relative height among the radio qualities of a plurality of terminals 20 is lower, and Pattern B in which a lower frequency is allocated as the relative height is lower has been described. Hereinafter, an example of using still other patterns as the frequency resource allocation pattern by the base station 10 will be described.

[0050] The base station 10 may use three or more patterns as the frequency resource allocation pattern. In this case, for example, the base station 10 allocates higher or lower frequencies among the available frequency resources as the relative height among the radio qualities of the plurality of terminals 20 is higher, and allocates frequencies closer to the intermediate height among the available frequency resources as the relative height is lower. A pattern C (an example of the "third pattern") may be used.

[0051] Further, the base station 10 may use a pattern D that allocates frequency resources regardless of the relative height among the radio qualities of the plurality of terminals 20. Note that the base station 10 may use a method known as a frequency resource allocation method as pattern D.

[0052] In the example of FIG. 7 described above, one cell was adjacent to six cells. On the other hand, cases such as one cell being adjacent to seven or more cells can also be assumed. In such a case, the base station 10 can reduce an increase in interference between cells by further using (using in combination) at least one of pattern C and pattern D.

[0053] <Modification Example 2> FIG. 10 is a diagram showing an example of the configuration of a computer 100 when at least a part of the base station 10 (for example, the control unit 13) or at least a part of the terminal 20 (for example, the control unit 23) is realized by a computer and a program. In the example of FIG. 10, the computer 100 includes a processor 101, a memory 102, and a communication interface 103. These units may be connected by a bus or the like. The memory 102 stores at least a part of the program 104. The communication interface 103 includes an interface necessary for communication with other network elements. In the case of the base station 10, the communication interface 103 includes, for example, an interface for communication with the terminal 20 via one or more antennas, an interface for communication between base stations, and an interface for communication with various servers on the core network side.

[0054] When program 104 is executed through the cooperation of a processor 101, a memory 102, etc., at least part of the processing of the embodiments of the present disclosure is performed by computer 100. The memory 102 may be of any type suitable for a local technical network. The memory 102 may be, as a non-limiting example, a non-transitory computer-readable storage medium. Also, the memory 102 may be implemented using any suitable data storage technology such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. Although only one memory 102 is shown for computer 100, there may be several physically different memory modules in computer 100. The processor 101 may be of any type. The processor 101 may include one or more of a general-purpose computer, a dedicated computer, a microprocessor, a digital signal processor (DSP), and, as a non-limiting example, a processor based on a multi-core processor architecture. Computer 100 may have multiple processors such as an application-specific integrated circuit chip that is temporally dependent on a clock that synchronizes the main processor.

[0055] Embodiments of the present disclosure may be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, a microprocessor, or other computing device.

[0056] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, which are executed on a device on a target physical processor or virtual processor to execute the processes or methods of the present disclosure. Program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The functions of the program modules may be combined or divided among the program modules as desired in various embodiments. The machine-executable instructions of the program modules can be executed within a local or distributed device. In a distributed device, the program modules can be located on both local and remote storage media.

[0057] The program code for executing the method of the present disclosure may be written in any combination of one or more programming languages. This program code is provided to a processor or controller of a general-purpose computer, a dedicated computer, or other programmable data processing device. When the program code is executed by the processor or controller, the functions / operations in the flowchart and / or the implementation block diagram are executed. The program code is executed entirely on the machine, partly on the machine as a stand-alone software package, partly on the machine, partly on a remote machine, or entirely on a remote machine or server.

[0058] The program can be stored using various types of non-transitory computer-readable media and supplied to a computer. Non-transitory computer-readable media include various types of tangible recording media. Examples of non-transitory computer-readable media include magnetic recording media, magneto-optical recording media, optical disk media, semiconductor memories, etc. Magnetic recording media include, for example, flexible disks, magnetic tapes, hard disk drives, etc. Magneto-optical recording media include, for example, magneto-optical disks, etc. Optical disk media include, for example, Blu-ray disks, CD (Compact Disc)-ROM (Read Only Memory), CD-R (Recordable), CD-RW (ReWritable), etc. Semiconductor memories include, for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory), etc. Also, the program may be supplied to the computer by various types of transitory computer-readable media. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. The transitory computer-readable media can supply the program to the computer via wired communication paths such as electric wires and optical fibers, or wireless communication paths.

[0059] Note that the present invention is not limited to the above-described embodiments and can be appropriately changed without departing from the gist.

Explanation of Reference Numerals

[0060] 1 Wireless communication system 10 Base station 11 Transmitter 12 Receiver 13 Control unit 20 Terminal 21 Transmitter 22 Receiver 23 Control unit

Claims

1. a receiving unit that receives information indicating the first radio quality of the first terminal located in the first cell and information indicating the second radio quality of the second terminal located in the first cell; a control unit that determines a frequency resource to be allocated to the first terminal among the frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; a transmitting unit that transmits information indicating the frequency resource determined by the control unit to the first terminal; comprising wherein the control unit when the second radio quality is lower than the first radio quality, a first frequency allocation pattern that allocates a frequency resource having a higher frequency than the frequency resource allocated to the first terminal to the second terminal; when the second radio quality is lower than the first radio quality, among a first frequency allocation pattern that allocates a frequency resource having a higher frequency than the frequency resource allocated to the first terminal to the second terminal and a second frequency allocation pattern that allocates a frequency resource having a lower frequency than the frequency resource allocated to the first terminal to the second terminal, a second cell adjacent to the first cell, at least a part of the available frequency resources being the same as those of the first cell, and a frequency allocation pattern different from the frequency allocation pattern in the second cell that determines the frequency resource to be allocated to the terminals located in the second cell in the first frequency allocation pattern or the second frequency allocation pattern, based on the information indicating the first radio quality and the information indicating the second radio quality, determines the frequency resource to be allocated to the first terminal located in the first cell; base station.

2. wherein the control unit allocates a frequency resource closer to the middle height among the frequency resources available in the first cell than the frequency resource allocated to the first terminal to the second terminal having the second radio quality lower than the first radio quality; The base station according to claim 1.

3. the receiving unit receives information indicating the third radio quality of a third terminal located in the first cell, when the information indicating the third radio quality is received by the receiving unit, the control unit redetermines the frequency resource to be allocated to the first terminal among the frequency resources available in the first cell based on the information indicating the first radio quality, the information indicating the second radio quality, and the information indicating the third radio quality; The base station according to claim 1 or 2.

4. the information indicating the first radio quality includes At least one of the channel state information (CSI) received from the first terminal, the signal power to interference power ratio in the uplink or downlink with respect to the first terminal, the transmission power of radio waves in the uplink or downlink with respect to the first terminal, and information indicating the current position of the first terminal is included. The base station according to any one of claims 1 to 3.

5. The base station A process of receiving information indicating the first radio quality of the first terminal located in the first cell and information indicating the second radio quality of the second terminal located in the first cell; A process of determining a frequency resource to be allocated to the first terminal among the frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; A process of transmitting information indicating the determined frequency resource to the first terminal; Execute In the process of determining When the second radio quality is lower than the first radio quality, a first frequency allocation pattern in which a frequency resource having a higher frequency than the frequency resource allocated to the first terminal is allocated to the second terminal; When the second radio quality is lower than the first radio quality, among the first frequency allocation pattern and the second frequency allocation pattern in which a frequency resource having a lower frequency than the frequency resource allocated to the first terminal is allocated to the second terminal, A second cell adjacent to the first cell, at least a part of the available frequency resources of which is the same as that of the first cell, and a frequency allocation pattern different from the frequency allocation pattern in the second cell for determining the frequency resource allocated to the terminal located in the second cell in the first frequency allocation pattern or the second frequency allocation pattern, based on the information indicating the first radio quality and the information indicating the second radio quality, determine the frequency resource to be allocated to the first terminal located in the first cell. Wireless communication method.

6. A wireless communication system having a base station and a terminal, The base station A receiving unit that receives information indicating the first radio quality of the first terminal located in the first cell and information indicating the second radio quality of the second terminal located in the first cell; A control unit that determines a frequency resource to be allocated to the first terminal among the frequency resources available in the first cell based on the information indicating the first radio quality and the information indicating the second radio quality; A transmitter that transmits information indicating the frequency resource determined by the control unit to the first terminal. The control unit When the second radio quality is lower than the first radio quality, a first frequency allocation pattern that allocates a frequency resource having a higher frequency than the frequency resource allocated to the first terminal to the second terminal. Among the first frequency allocation pattern and the second frequency allocation pattern that allocates a frequency resource having a lower frequency than the frequency resource allocated to the first terminal to the second terminal when the second radio quality is lower than the first radio quality. A second cell adjacent to the first cell, at least a part of the available frequency resources being the same as those of the first cell, and a frequency allocation pattern different from the frequency allocation pattern in the second cell that determines the frequency resources allocated to the terminals camping in the second cell in the first frequency allocation pattern or the second frequency allocation pattern. Based on the information indicating the first radio quality and the information indicating the second radio quality, determine the frequency resources allocated to the first terminal camping in the first cell. The terminal Performs wireless communication in at least one of the downlink and the uplink using the frequency resources allocated to the base station. A wireless communication system.

7. The control unit determines the frequency resources allocated to the first terminal among the frequency resources available in the first cell based on the comparison result between the first radio quality and the second radio quality. The wireless communication system according to claim 6.

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