JP2018038016A - Base station and measurement instruction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of frequency carriers to be measured when acquiring information on the quality of cells in different frequency carriers in the same frequency band.SOLUTION: A base station according to one form of the present invention comprises: a cell configuration management unit that manages, of cells present in the same frequency band, a group of cells formed with the same antenna; and a carrier selection and instruction unit that, when selecting one or more frequency carriers for instructing measurement to a mobile machine, for a plurality of frequency carriers for the cells in the same group present in the same frequency band and managed by the cell configuration management unit, excludes part of the plurality of frequency carriers from measurement object and then instructs measurement of the frequency carriers to the mobile machine.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a base station and a measurement instruction method in a wireless communication system.

  The LTE (Long Term Evolution) mobile communication system standardized by the 3rd Generation Partnership Project (3GPP) has good reception quality when reception quality deteriorates due to movement of user equipment (UE), etc. Handover control for switching a communication destination base station (eNB: Evolved Node B) to another cell is used. In addition, in order to realize high-speed and large-capacity communication, band-distributed handover control (also referred to as “band-distributed control”) for the purpose of load distribution of cells in each frequency band is also used. Moreover, in LTE-Advanced which evolved LTE, CA (Carrier Aggregation) control for communicating with a mobile device using a plurality of frequency bands is introduced.

  In the handover control, the band dispersion control, and the CA control, the base station instructs the mobile device to measure one or more frequency carriers, and the mobile device acquires a measurement result regarding the quality of each frequency carrier. Based on the quality measurement result of each frequency band acquired by the mobile station, the base station determines a cell in which the mobile station should be located in handover control and band distribution control, or sets a secondary in the mobile station in CA control. A cell is determined (see Patent Document 1).

JP 2006-96373 A

3GPP TS36.133 V13.3.0 (2016-03)

  In the LTE system, the maximum time from when the mobile device measures one frequency carrier and reports the measurement result to the base station is defined (see Non-Patent Document 1). In the LTE system, there may be a plurality of cells having different center frequencies even within a single frequency band. FIG. 1 is a diagram illustrating a relationship between frequency bands and frequency carriers in the LTE system. Two frequency carriers #A and #B having different center frequencies are set in the frequency band XX, and communication is possible with the frequency carrier #A within the cell # 1, and the frequency carrier #B within the cell # 2. It is possible to communicate with. As described above, if the center frequency is different, it is regarded as a different frequency carrier. Therefore, the mobile station needs to measure the quality of the cell # 1 and the quality of the cell # 2 separately and report the measurement result to the base station. Thus, when measuring the quality of a cell separately, the number of frequency carriers which a mobile device measures increases, and time required to report a quality measurement result to a base station increases. In addition, the power consumption of the mobile device increases.

  An object of the present invention is to reduce the number of frequency carriers to be measured when acquiring quality information of cells of different frequency carriers in the same frequency band.

A base station according to an aspect of the present invention is:
A cell configuration management unit that manages a group of cells formed by the same antenna among cells existing in the same frequency band;
When selecting one or more frequency carriers for instructing measurement to a mobile station, the plurality of frequency carriers of the same group of cells that are in the same frequency band and managed in the cell configuration management unit A measurement carrier selection and instruction unit for instructing the mobile device to measure the frequency carrier after excluding a part of the frequency carrier from the measurement target,
It is characterized by providing.

  According to the present invention, when acquiring quality information of cells of different frequency carriers in the same frequency band, it is possible to reduce the number of frequency carriers to be measured.

The figure which shows the relationship between the frequency band and frequency carrier in a LTE system 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention. The sequence diagram of CA control in one embodiment of the present invention 1 is a schematic block diagram showing an example of the configuration of a base station according to an embodiment of the present invention. The figure which shows an example of the cell information hold | maintained in a cell structure management part (the 1) The figure which shows an example of the cell information managed in the cell structure management part (the 2) Flow chart of partial carrier measurement control in one embodiment of the present invention Schematic showing an example where there are frequency carriers for which partial carrier measurement cannot be performed The figure which shows an example of the cell information currently hold | maintained in the cell structure management part (the 3) Flow chart of measurement report acquisition control in one embodiment of the present invention Schematic showing an example of generating cell information by exchanging information between base stations The figure which shows an example of the hardware constitutions of the base station by one Embodiment of this invention

  Embodiments of the present invention will be described with reference to the drawings.

<Configuration of wireless communication system>
First, a radio communication system according to an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention.

  As shown in FIG. 2, the wireless communication system includes a base station 10 having one or more antennas 20-1 and 20-2 and a mobile device 30. In the example of FIG. 2, one base station 10 and one mobile device 30 are illustrated, but a plurality of base stations 10 may be included or a plurality of mobile devices 30 may be included.

  Base station 10 may accommodate one or more (eg, three) cells (also referred to as sectors). When the base station eNB accommodates a plurality of cells, the entire coverage area of the base station 10 can be divided into a plurality of smaller areas, and each smaller area can be divided into a base station subsystem (eg, an indoor small base station RRH). : Remote Radio Head) can also provide communication services. The terms “cell” or “sector” refer to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. Further, the terms “base station”, “eNB”, “cell”, and “sector” may be used interchangeably herein. The base station eNB may be referred to by terms such as a fixed station, NodeB, eNodeB (eNB), access point, femtocell, and small cell.

  The mobile device 30 can be obtained by those skilled in the art from a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

  The base station 10 provides one or more cells, and performs wireless communication with the mobile device 30 via the cells. Antenna 20-1 provides cells # 1 and # 2 of different frequency carriers #A and #B in the same frequency band XX, and antenna 20-2 provides different frequency carriers #A and #B in the same frequency band XX. Cell # 3 and cell # 4 are provided.

  The base station 10 instructs the mobile device 30 to measure the radio quality of one or more other cells at any timing such as when a call is made / received, during communication, or at the end of a call. Get a measurement report on cell measurement results. Based on the measurement report reported from the mobile device 30, the base station 10 causes the mobile device 30 to transition to another cell (handover control, band distribution control), or sets a secondary cell for the mobile device 30 (CA). Control).

  In the present embodiment, even if a plurality of cells of the base station 10 are cells of different frequency carriers, if the group of the cells is formed in the same frequency band and by the same antenna, the cells of the same group That the wireless quality is equivalent. In other words, measurement of some frequency carriers is performed from among multiple frequency carriers in the same group of cells, and the quality measurement results of frequency carriers reported from the mobile device are used to measure the quality of frequency carriers that are not being measured. By using it as a result, it is possible to reduce the number of frequency carriers instructing the mobile device to perform measurement. Furthermore, instead of the reduced frequency carriers, it is also possible to acquire cell quality information on other frequency carriers. Hereinafter, such control that excludes a part of the frequency carrier from the measurement target and performs the measurement is referred to as partial carrier measurement.

  Subsequently, a base station according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a sequence diagram of CA control according to an embodiment of the present invention. In the present embodiment, an embodiment of CA control in a case where the mobile device (UE) 30 transmits from an idle state in wireless communication will be described.

  After setting RRC (Radio Resource Control) between the base station (eNB) 10 and the mobile device 30 (S101), the base station 10 uses the arbitrary logic to select a cell that can be a candidate for a secondary cell and the cell A cell frequency carrier is selected (S103). At this time, with reference to the selected frequency carrier and its frequency band, it is determined whether there is a frequency band in which partial carrier measurement is possible by the logic shown in the description of FIG. When there is a frequency band in which partial carrier measurement is possible, a part of the frequency carrier in the frequency band is excluded from the measurement target, and a measurement is instructed to the mobile device. For example, in FIG. 3, after selecting the frequency carrier #a of the 800 MHz band, the frequency carrier #b of the 1.5 GHz band, the frequency carrier #c of the 3.5 GHz band, and the frequency carrier #d as the measurement carrier, the 3.5 GHz band is selected. It is determined that the partial carrier can be measured, and the frequency carrier #d is excluded from the measurement target.

  The base station 10 instructs the measurement of the frequency carrier remaining as a measurement target to the mobile device 30 by RRC Connection Reconfiguration (S105), and receives measurement setting completion from the mobile device 30 by RRC Connection Reconfiguration Complete (S107). ). The mobile device 30 performs the measurement of the instructed frequency carrier, and reports the quality measurement result of each cell in each frequency carrier to the base station 10 as a measurement report (S111, S113, S115).

  When the base station 10 refers to the received measurement report and reports the cell of the frequency carrier of the band for which the partial carrier measurement is performed, it is excluded by the partial carrier measurement according to the logic shown in the description of FIG. 10 described later. The quality information of the cell of the frequency carrier (frequency carrier #d in the 3.5 GHz band) is generated (S117). The base station 10 refers to the acquired cell quality information and the like of each frequency carrier, and determines a cell to be used as a secondary cell by CA control (S119).

  In this way, in the example of FIG. 3, the base station 10 can acquire the quality information of the cells for four frequency carriers even though the mobile station 30 has only instructed the measurement for the three frequency carriers. It becomes.

  In addition, although the example of CA control is shown in FIG. 3, handover control and band dispersion control can also be performed in the same procedure.

  FIG. 4 is a schematic block diagram showing a configuration example of the base station 10 in one embodiment of the present invention.

  The base station 10 includes a radio communication control unit 101, a cell configuration management unit 103, a measurement carrier selection / instruction unit 105, and a measurement report acquisition unit 107.

  The wireless communication control unit 101 is a functional unit that performs wireless communication with the mobile device 30. The radio communication control unit 101 generates various downlink signals to be transmitted from the base station 10 and transmits them to the mobile device 30. For example, the wireless communication control unit 101 transmits RRC Connection Reconfiguration for instructing the mobile device 30 to perform measurement. Further, the radio communication control unit 101 receives various uplink signals from the mobile device 30. For example, the wireless communication control unit 101 receives RRC Connection Reconfiguration Complete indicating completion of measurement setting from the mobile device 30 and receives a measurement report from the mobile device 30.

  The cell configuration management unit 103 is a functional unit that manages a group of cells formed by the same antenna among cells existing in the same frequency band as a group of cells capable of partial carrier measurement. For example, as shown in FIG. 5 or FIG. 6, the cell configuration management unit 103 includes a frequency band in which partial carrier measurement is possible, a frequency carrier operated in the frequency band, and a group of cells in which the cell quality is equivalent. Manage. For example, in FIG. 5, the quality of cell # 1 of frequency carrier #A and cell # 2 of frequency carrier #B are equivalent, and the quality of cell # 3 of frequency carrier #A and cell # 4 of frequency carrier #B are equivalent. Each is managed as a group. Similarly, in FIG. 6, the quality of the cell # 5 of the frequency carrier #C, the cell # 6 of the frequency carrier #D, and the cell # 7 of the frequency carrier #E are equivalent, and similarly, the cell # 8 of the frequency carrier #C The quality of the cell # 9 of the frequency carrier #D and the quality of the cell # 10 of the frequency carrier #E are the same, and each is managed as one group. The determination that the quality of the cells is the same can be made by being in the same frequency band and being formed by the same antenna as shown in FIG. The management table as shown in FIG. 5 or FIG. 6 may be manually set in advance in the base station 10 or may be automatically created by the base station 10 based on the frequency band information or antenna information of each cell. good.

  The measurement carrier selection and instruction unit 105 is a functional unit that selects a frequency carrier that causes the mobile device 30 to perform measurement. Whether or not partial carrier measurement can be performed based on the cell information managed by the cell configuration management unit 103 is determined. Judgment and frequency carrier exclusion processing are performed. Specifically, the measurement carrier selection / instruction unit 105 exists in the same frequency band managed by the cell configuration management unit 103 when selecting one or more frequency carriers instructing the mobile station 30 to perform measurement. It is determined that partial carrier measurement can be performed for a plurality of frequency carriers in the same group of cells, and a part of the plurality of frequency carriers is excluded from the measurement target, and then the frequency carrier measurement is performed on the mobile device 30. To instruct.

  The measurement report acquisition unit 107 is a functional unit that manages the information of the measurement report acquired from the mobile device 30, and based on the cell information held by the cell configuration management unit 103, the frequency carrier excluded by the partial carrier measurement. Generate cell quality information. Specifically, the measurement report acquisition unit 107 acquires a measurement report related to the frequency carrier instructed to be measured from the mobile device 30 and acquires from the cell configuration management unit 103 cells of the same group as the cells measured in the measurement report. Therefore, the quality information of the cells in the same group is regarded as equivalent to the quality information of the cells measured in the measurement report.

  FIG. 7 is a flowchart of partial carrier measurement control in one embodiment of the present invention. This control is performed by the measurement carrier selection and instruction unit 105. First, the measurement carrier selection / instruction unit 105 selects a measurement carrier by an arbitrary method in various controls such as handover control, band dispersion control, and CA control (S201). Thereafter, cell information held by the cell configuration management unit 103 is acquired, and it is determined whether there is a band in which partial carrier measurement is possible (S203). If there is a band in which partial carrier measurement is possible, some frequency carriers are excluded from the measurement target (S205). The selection of the frequency carrier to be excluded may select an arbitrary frequency carrier, may select a certain frequency carrier fixedly, or may select based on some determination logic.

  For example, when the cell information of FIG. 5 is acquired from the cell configuration management unit 103, the measurement carrier selection and instruction unit 105 determines that the cell # 1 of the frequency carrier #A and the cell # 2 of the frequency carrier #B are in the same group. Similarly, it can be recognized that the cell # 3 of the frequency carrier #A and the cell # 4 of the frequency carrier #B are managed as cells of the same group. Therefore, the measurement carrier selection / instruction unit 105 determines that the partial carrier measurement is possible for the frequency band XX, and can exclude one of the frequency bands XX from the measurement target.

  For example, when the cell information of FIG. 6 is acquired from the cell configuration management unit 103, the measurement carrier selection and instruction unit 105 sets the cell # 5 of the frequency carrier #C, the cell # 6 of the frequency carrier #D, and the frequency carrier #E. Cell E7 is managed as a cell of the same group. Similarly, cell # 8 of frequency carrier #C, cell # 9 of frequency carrier #D, and cell # 10 of frequency carrier #E are managed as cells of the same group. It can be recognized that Therefore, the measurement carrier selection and instruction unit 105 determines that the frequency band YY can perform partial carrier measurement, and can exclude one or two frequency carriers in the frequency band YY from the measurement target.

  FIG. 8 is a schematic diagram illustrating an example in which there are frequency carriers that cannot be subjected to partial carrier measurement. For example, in the case of FIG. 8, among the frequency carriers #F and #G existing in the same frequency band ZZ, the antenna 20-3 of the base station 10 forms only the cell # 15, and the radio It does not form a group of cells that are considered equal in quality. In such a case, the measurement carrier selection and instruction unit 105 acquires the cell information as shown in FIG. 9 from the cell configuration management unit 103. If the mobile station 30 in FIG. 8 is instructed to measure only the frequency carrier #G, the mobile station 30 does not detect a cell of the frequency carrier #G corresponding to the cell # 15, and therefore does not report a measurement report. As described above, since there is a group of cells that do not include the cell of the frequency carrier #G, the measurement carrier selection and instruction unit 105 excludes the frequency carrier #G in which the cell formed by the same antenna does not exist from the measurement target. May be. As a result, the mobile device 30 can measure the quality of the cell # 15 by instructing the measurement of the frequency carrier #F in the case as shown in FIG.

  Alternatively, when there is a frequency carrier #G where there is no cell formed by the same antenna as shown in FIG. 8, it may be determined that the frequency carriers #F and #G cannot be excluded from the measurement target.

  Here, after excluding a part of the frequency carrier from the measurement target, a frequency carrier in another frequency band may be newly added as the measurement target. The number of frequency carriers newly added as a measurement target is not limited to the number of frequency carriers reduced by the above partial carrier measurement process, but may be smaller than the number of frequency carriers reduced or less than the number of frequency carriers reduced. May be more. In this case, instead of expecting the effect of reducing the number of frequency carriers, information on a larger number of frequency carriers can be obtained, and the implementation effect of each control such as handover, band distribution, and CA can be enhanced. In particular, in the LTE system, an upper limit is defined for the number of frequency carriers that can be measured at one time by a mobile device (see Non-Patent Document 1), and thus such processing is effective.

  The measurement carrier selection and instruction unit 105 instructs the measurement of the frequency carrier selected by the above processing to the mobile device 30 via the wireless communication control unit 101 (S207).

  FIG. 10 is a flowchart of measurement report acquisition control according to an embodiment of the present invention. This control is performed by the measurement report acquisition unit 107. First, the measurement report acquisition unit 107 receives a measurement report from the mobile device 30 (S301), and determines whether each cell included in the measurement report is a cell of a band for which partial carrier measurement has been performed (S303). ). When the above is YES, the measurement report acquisition unit 107 acquires the cell information held by the cell configuration management unit 103, and determines whether there is a cell that belongs to the same group as the cell included in the measurement report. (S305). When the above is YES, the quality information of the cells belonging to the same group is generated using the quality information of the cells included in the measurement report (S307). For example, the quality information may be generated by generating the same information as the quality of the cell reported in the measurement report, or adding some correction to the reported quality.

  For example, in FIG. 5, when the frequency carrier #B is excluded from the measurement target and the measurement report of the frequency carrier #A is acquired, the measurement report acquisition unit 107 displays the quality information of the cell # 2 of the frequency carrier #B as the measurement. The quality information of the cell # 1 measured in the report is regarded as equivalent to the quality information of the cell # 4 of the frequency carrier #B, and the quality information of the cell # 3 measured in the measurement report is regarded as equivalent.

  Similarly, in FIG. 6, when the frequency carriers #D and #E are excluded from the measurement target and the measurement report of the frequency carrier #C is acquired, the measurement report acquisition unit 107 sets the cell # 6 and the frequency of the frequency carrier #D. The quality information of cell # 7 of carrier #E is regarded as equivalent to the quality information of cell # 5 measured in the measurement report, and the quality information of cell # 9 of frequency carrier #D and cell # 10 of frequency carrier #E The quality information of cell # 8 measured in the measurement report is regarded as equivalent.

  After performing the above processing for all the cells included in the measurement report (S309), various kinds of control such as handover control, band distribution control, and CA control are performed using the acquired quality information of all the cells.

  Next, an example in which cell information is generated in the cell configuration management unit 103 by exchanging cell information between base stations will be described. FIG. 11 is a schematic diagram illustrating an example of generating cell information by exchanging information between base stations. An example in which cells of different base stations 10-1 and 10-2 exist around the mobile device 30 is shown. The base station 10-1 can generate cell information of the cells # 1 and # 2 formed by the same antenna 20-1 in the same frequency band XX, and the base station 10-2 can generate the cell information in the same frequency band XX. Thus, the cell information of the cells # 3 and # 4 formed by the same antenna 20-4 can be generated. Thereafter, by managing cell information in cooperation between the base stations 10-1 and 10-2, it is possible to perform partial carrier measurement even in an example as shown in FIG. That is, in this embodiment, the cell configuration management unit 103 of the base station 10-1 acquires cell information of the other base station 10-2, and performs partial carrier measurement including the cell information. Similarly, the cell configuration management unit 103 of the other base station 10-2 also acquires the cell information of the base station 10-1, and performs partial carrier measurement including the cell information. As a result, quality information can be generated by partial carrier measurement even for cells of different base stations. According to the present embodiment, it is possible to perform partial carrier measurement when handing over to a cell of a different base station, performing band distribution, or setting a cell of a different base station as a secondary cell by DC (Dual Connectivity) control. It becomes possible to extend the scope of the invention.

<Hardware configuration>
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.

  For example, a base station or the like in an embodiment of the present invention may function as a computer that performs the processing of the method of the present invention. FIG. 12 is a diagram illustrating an example of a hardware configuration of the base station 10 according to an embodiment of the present invention. The above-described base station 10 may be physically configured as a computer apparatus including a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007, and the like.

  In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station 10 may be configured to include one or a plurality of devices illustrated in the figure, or may be configured not to include some devices.

  Each function in the base station 10 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, communication by the communication device 1004, and / or the memory 1002. This is realized by controlling reading and / or writing of data in the storage 1003.

  For example, the processor 1001 controls the entire computer by operating an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, a part of the cell configuration management unit 103, the measurement carrier selection / instruction unit 105, the measurement report acquisition unit 107, and the like may be realized by the processor 1001.

  Further, the processor 1001 reads a program (program code), a software module, and / or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, a part of the cell configuration management unit 103 described above, the measurement carrier selection and instruction unit 105, the measurement report acquisition unit 107, and the like may be realized by a control program stored in the memory 1002 and operating on the processor 1001. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to perform the method according to the embodiment of the present invention.

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

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the above-described wireless communication control unit 101 or the like may be realized by the communication device 1004.

  The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that accepts an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

  Each device such as the processor 1001 and / or the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

The base station 10 includes hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). A part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.
<Effect of Embodiment of the Present Invention>
According to the embodiment of the present invention, it is possible to reduce the number of frequency carriers to be measured when acquiring quality information of cells of different frequency carriers in the same frequency band. Also, in the measurement report of the reduced frequency carrier, various controls such as handover control, band dispersion control, CA control, etc. are performed by regarding the quality of cells formed by the same antenna in the same frequency band as equivalent. Can do.

  For this reason, the time required for completing handover, band distribution, or CA control increases, and quality is degraded and the connection is disconnected before handover control is completed, or in band distribution or CA control. It is possible to avoid a situation in which a delay occurs until high-speed and large-capacity communication is performed. In addition, power consumption in the mobile device can be saved by reducing the number of carriers to be measured.

  In addition, by adding frequency carriers in other frequency bands as measurement targets with the number of reduced frequency carriers as the upper limit, the effect of reducing the number of frequency carriers cannot be expected, but more frequency carrier information can be obtained. And the effect of implementing each control such as handover, band distribution, and CA can be enhanced.

  In addition, when exchanging cell information between base stations, it is possible to perform partial carrier measurement even when handing over to another base station cell, performing band distribution, or setting a different base station cell as a secondary cell by DC control. It can be implemented and the scope of application of the present invention can be expanded.

<Supplement>
Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

  As used herein, the terms “system” and “network” are used interchangeably.

  The specific operation assumed to be performed by the base station in this specification may be performed by its upper node in some cases. In a network composed of one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station and / or other network nodes other than the base station (e.g., Obviously, this can be done by MME or S-GW, but not limited to these. In the above, the case where there is one network node other than the base station is illustrated, but a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

  Information or the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

  Input / output information or the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

  The notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

  The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be compared with a numerical value (for example, a predetermined value) Comparison with the value).

  Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

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

  Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal. The signal may be a message. Further, the component carrier (CC) may be called a carrier frequency, a cell, or the like.

  In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by an index.

  The names used for the parameters described above are not limiting in any way. Further, mathematical formulas and the like that use these parameters may differ from those explicitly disclosed herein. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements (eg, TPC, etc.) can be identified by any suitable name, the various names assigned to these various channels and information elements are However, it is not limited.

  As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment”, “decision” can be, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another (Searching in the data structure), and confirming (ascertaining) what has been confirmed may be considered as “determining” or “determining”. In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

  The terms “connected”, “coupled”, or any variation thereof, means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples By using electromagnetic energy, such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  Any reference to elements using the designations “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, a reference to the first and second elements does not mean that only two elements can be employed there, or that in some way the first element must precede the second element.

  As long as “include”, “including”, and variations thereof are used in the specification or claims, these terms are similar to the term “comprising”. It is intended to be comprehensive. Further, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

  Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

10, 10-1, 10-2 Base station 20-1, 20-2, 20-3, 20-4 Antenna 30 Mobile device 101 Wireless communication control unit 103 Cell configuration management unit 105 Measurement carrier selection and instruction unit 107 Measurement report Acquisition unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device

Claims (6)

A cell configuration management unit that manages a group of cells formed by the same antenna among cells existing in the same frequency band;
When selecting one or more frequency carriers for instructing measurement to a mobile station, the plurality of frequency carriers of the same group of cells that are in the same frequency band and managed in the cell configuration management unit A measurement carrier selection and instruction unit for instructing the mobile device to measure the frequency carrier after excluding a part of the frequency carrier from the measurement target,
A base station comprising: Obtain a measurement report on the frequency carrier instructing the measurement from the mobile station, obtain a cell in the same group as the cell measured in the measurement report from the cell configuration management unit, and obtain quality information of the cell in the same group. A measurement report acquisition unit that is regarded as equivalent to the cell quality information measured in the measurement report;
The base station according to claim 1. The measurement carrier selection and instruction unit adds another frequency carrier as a measurement target after excluding a part of the frequency carrier from the measurement target.
The base station according to claim 1 or 2, characterized in that The measurement carrier selection and instruction unit is
Among frequency carriers existing in the same frequency band, exclude frequency carriers in which a cell formed by the same antenna does not exist from the measurement target.
The base station according to any one of claims 1 to 3, wherein The cell configuration management unit
Information of a group of cells formed by the same antenna in its own base station is notified to another base station, and information of a group of cells formed by the same antenna in the other base station To get from
The base station according to claim 1, wherein the base station is a base station. A frequency carrier measurement instruction method in a base station,
Managing a group of cells formed by the same antenna among cells existing in the same frequency band;
When selecting one or more frequency carriers instructing measurement to a mobile station, for the frequency carriers of the same group of cells in the same frequency band that are managed, a part of the frequency carriers is measured Instructing the mobile device to measure a frequency carrier,
A measurement instruction method comprising:

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