JP2018148376A - Radio base station and radio communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio base station and a radio communication method that can autonomously generate an appropriate Neighbor Relation Table (NRT) even when there exists a user device or the like installed in a drone.SOLUTION: An eNB 100A updates contents of a neighbor cell information table including information on a cell serving as a handover destination candidate of UE, based on information on the cell reported from an UE. The eNB100A includes a device identifying unit 130 that identifies whether the UE is a specific UE capable of executing communication over a plurality of cells, and a handover control unit 140 that stops addition of the cell serving as the handover destination candidate reported from the specific UE to the neighbor cell information table when the device identifying unit 130 identifies the UE as the specific UE.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a radio base station and a radio communication method for updating the contents of a neighboring cell information table including information on a cell that is a handover destination candidate of a user apparatus.

  The 3rd Generation Partnership Project (3GPP) has specified LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced) for the purpose of further speeding up Long Term Evolution (LTE). In 3GPP, specifications for a successor system of LTE called 5G (5th generation mobile communication system) are also being studied.

  In LTE, a radio base station (eNB) has a neighbor cell information table that is a table including information on neighbor cells of the radio base station in order to grasp a handover destination candidate of a user apparatus (UE). Such a neighbor cell information table is specifically called a Neighbor Relation Table (NRT) (see, for example, Non-Patent Document 1).

  Specifically, the eNB determines whether or not the handover destination candidate cell reported by the UE is registered in the NRT. If the cell is registered in the NRT, the eNB performs UE handover to the cell.

  Further, even when the handover destination candidate cell reported by the UE is not registered in the NRT, the eNB allows the UE to be handed over to the cell and adds the cell to the NRT (referred to as NRT-less handover). Can do. As a result, NRT can be generated autonomously, and NRT management man-hours can be reduced.

3GPP TS 36.300 V14.1.0 Subclause 22.3.3 Intra-LTE / frequency Automatic Neighbor Relation Function, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network ( E-UTRAN); Overall description; Stage 2 (Release 14), 3GPP, December 2016

  Recently, there are UEs (hereinafter referred to as “specific UEs”) that perform communication in a clear sky in all directions rather than on the ground, such as UEs installed in drones.

  Since such a specific UE has a good line-of-sight, there is a possibility of capturing not only neighboring cells but also distant cells. For this reason, when the above-described NRT-less handover is applied to a specific UE, a distant cell is added to the NRT.

  On the other hand, a normal UE located on the ground or the like cannot naturally communicate with the distant cell. However, if the distant cell is registered in the NRT, the eNB may instruct a handover to the distant cell even in a normal UE.

  Therefore, the present invention has been made in view of such a situation, and even when there is a user device mounted on a drone, a radio base that can autonomously generate an appropriate Neighbor Relation Table (NRT) An object is to provide a station and a wireless communication method.

  The radio base station according to an aspect of the present invention updates the contents of a neighboring cell information table including information on cells that are handover destination candidates of the user apparatus based on cell information reported from the user apparatus. The radio base station includes: a device identifying unit that identifies whether or not the user device is a specific user device that can execute communication over a plurality of cells; and the user identifying unit and the specific user device by the device identifying unit. A handover control unit that stops adding a cell that is a handover destination candidate reported from the specific user apparatus to the neighboring cell information table when it is identified.

  The radio communication method according to an aspect of the present invention updates the contents of a neighboring cell information table including information on cells that are handover destination candidates of the user apparatus based on cell information reported from the user apparatus. The wireless communication method includes a step of identifying whether or not the user device is a specific user device capable of performing communication over a plurality of cells, and when the user device is identified as the specific user device, the specific device A step of canceling addition of a cell as a handover destination candidate reported from the user apparatus to the neighboring cell information table.

  According to the radio base station and the radio communication method described above, an appropriate Neighbor Relation Table (NRT) can be autonomously generated even when a user device or the like mounted on the drone exists.

FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10. FIG. 2 is a functional block configuration diagram of the eNB 100A. FIG. 3 is a functional block configuration diagram of UE 200B. FIG. 4 is a diagram illustrating an operation flow of NRT-less handover by the eNB 100A. FIG. 5 is a diagram illustrating an identification operation flow (operation example 1) of a specific UE. FIG. 6 is a diagram showing a specific UE identification operation flow (operation example 2). FIG. 7 is a diagram illustrating a specific UE identification operation flow (operation example 3). FIGS. 8A and 8B are diagrams illustrating a configuration example of the neighboring cell information table (NRT). FIG. 9 is a diagram illustrating an example of a hardware configuration of the eNBs 100A to 100C and the UEs 200A and 200B.

  Hereinafter, embodiments will be described with reference to the drawings. The same functions and configurations are denoted by the same or similar reference numerals, and description thereof is omitted as appropriate.

(1) Overall Schematic Configuration of Radio Communication System FIG. 1 is an overall schematic configuration diagram of a radio communication system 10 according to the present embodiment. The radio communication system 10 is a radio communication system according to Long Term Evolution (LTE). Note that the radio communication system 10 is not necessarily limited to LTE (E-UTRAN). For example, the radio communication system 10 may be a radio communication system defined as 5G.

  The radio communication system 10 includes radio base stations 100A to 100C (hereinafter, eNB100A to 100C) and user apparatuses 200A and 200B (hereinafter, UE200A and 200B).

  eNB100A-100C and UE200A, 200B perform radio | wireless communication according to the specification of LTE. The eNB 100A forms the cell C1. The eNB 100B forms the cell C2. The eNB 100C forms the cell C3.

  In particular, in the present embodiment, the eNBs 100A to 100C, based on the cell information reported from the UEs 200A and 200B, the neighboring cell information table including information on the cells that are the handover destination candidates of the UE, specifically, the Neighbor Update the contents of Relation Table (NRT).

  UE 200A is a normal UE, and performs radio communication with eNBs 100A to 100C on the ground or the like. The UE 200B is mounted on a small unmanned flying object such as a drone, and performs radio communication with the eNBs 100A to 100C not only on the ground but also in the sky above the cells C1 to C3 (for example, at an altitude of 30 m or more). In this embodiment, UE200B comprises a specific user apparatus (specific UE).

  Here, UE 200A is located in an area where cell C1 and cell C2 are formed, and can communicate with cell C1 and cell C2, but has a poor visibility with cell C3 and cannot communicate with cell C3. On the other hand, UE 200B is located in the sky, has a good line-of-sight with all cells (cells C1 to C3), and can communicate.

(2) Functional Block Configuration of Radio Communication System Next, a functional block configuration of the radio communication system 10 will be described. Specifically, the functional block configuration of the eNB 100A and the UE 200B will be described.

(2.1) eNB100A
FIG. 2 is a functional block configuration diagram of the eNB 100A. As illustrated in FIG. 2, the eNB 100A includes a radio signal transmission / reception unit 110, a reception state acquisition unit 120, a device identification unit 130, and a handover control unit 140. In addition, eNB100B and 100C also have the same configuration as eNB100A.

  The radio signal transmission / reception unit 110 transmits / receives a radio signal to / from the UE 200B (the same applies to other UEs below). Specifically, the radio signal transmission / reception unit 110 transmits / receives various physical channels (control channel and shared channel) in accordance with LTE regulations.

  Reception state acquisition section 120 acquires the reception state of UE 200B. Specifically, the reception state acquisition unit 120 can acquire interference levels in a plurality of cells (cells C1 to C3) including the own cell (for example, the cell C1) to which the UE 200B is connected.

  More specifically, the reception status acquisition unit 120 is an interference level in the own cell to which the UE 200B is connected (that is, the cell C1) and neighboring cells (cells C2 and C3) formed in the vicinity of the own cell. To get. In addition, the reception state acquisition unit 120 may acquire the interference power itself as the interference level, or may use the ratio of the signal level of the received signal from the SIR (Signal to Interference Ratio) UE 200B set in the UE 200B to perform interference. Electric power may be acquired.

  Further, the reception state acquisition unit 120 can acquire the received communication quality at the UE 200B in the plurality of cells. Specifically, the reception state acquisition unit 120 acquires a downlink path loss as the received communication quality in the own cell and neighboring cells to which the UE 200B is connected. The reception state acquisition unit 120 may acquire RSRP (Reference Signal Received Power) that can be a determination index similar to the path loss.

  Device identifying section 130 identifies the type of UE 200B. Specifically, the device identification unit 130 identifies whether or not the user device (UE) that performs radio communication with the eNB 100A is a specific user device (specific UE) that can perform communication over the plurality of cells.

  Specifically, the device identification unit 130 (i) identification using UE's IMEISV (International Mobile Equipment Identity Software Version) or contract type information, (ii) identification by separation of connection destination APN (Access Point Name), And (iii) identification based on a measurement report from the UE can be performed.

  For example, for (iii), when the measurement report reported from the UE 200B includes information of a predetermined number (for example, three) or more cells, the device identification unit 130 identifies the UE as a specific UE. May be. Alternatively, the device identifying unit 130 may identify the UE as a specific UE when the Reference Signal Received Power (RSRP) in the own cell and the RSRP in the neighboring cell are within a predetermined range.

  A specific identification method (i) to (iii) will be described later.

  The handover control unit 140 controls the handover of the UE 200B. Specifically, the handover control unit 140 determines a cell that is a handover destination candidate of the UE 200B using the neighboring cell information table (NRT). The handover control unit 140 instructs the UE 200B to perform handover to the cell that is the determined handover destination candidate.

  Further, the handover control unit 140 performs handover of the UE to the cell (NRT-less handover) even when the handover destination candidate cell (for example, the cell C2) reported by the UE (for example, the UE 200A) is not registered in the NRT. ) And add the cell to the NRT.

  Furthermore, when the UE is identified as a specific UE by the device identification unit 130, the handover control unit 140 stops adding a cell that is a handover destination candidate reported from the specific UE to the neighboring cell information table.

  For example, even when the cell C3 is reported as a handover destination candidate cell from the UE 200B identified as the specific UE, the handover control unit 140 does not add the cell C3 to the neighbor cell information table, and does not add to the neighbor cell information table. Do not update the contents of. However, the handover control unit 140 allows the handover of the UE 200B to the cell C3 and instructs the UE 200B to perform the handover to the cell C3.

(2.2) UE200B
FIG. 3 is a functional block configuration diagram of UE 200B. As shown in FIG. 3, UE 200B includes a radio signal transmission / reception unit 210, a measurement report unit 220, and a handover execution unit 230. In addition, although there is a difference whether or not UE 200A is mounted on the drone, it has substantially the same configuration as UE 200B.

  The radio signal transmission / reception unit 210 transmits / receives radio signals to / from the eNBs 100A to 100C. Specifically, the radio signal transmitting / receiving unit 210 transmits / receives various physical channels (control channel and shared channel) in accordance with LTE regulations.

  The measurement report unit 220 measures the received communication quality in the own cell and neighboring cells to which the UE 200B is connected. In addition, the measurement report unit 220 transmits a measurement report including the measurement result of the measured received communication quality to the connection destination eNB (for example, eNB 100A).

  The measurement report includes the number of neighboring cells, RSRP in the neighboring cells, RSRQ (Reference Signal Received Quality), and the like.

  The handover execution unit 230 executes a handover to another cell of the UE 200B. Specifically, when a cell satisfying a predetermined received communication quality is found among neighboring cells, the handover execution unit 230 sets the cell as a handover destination candidate cell, and connects to the eNB (e.g., eNB100A). )

  For example, when the UE 200B is connected to the cell C1 formed by the eNB 100A and the cell C3 satisfies a predetermined reception communication quality, the UE 200B reports the cell C3 to the eNB 100A as a handover destination candidate cell.

  Based on the handover instruction from the eNB 100A, the handover execution unit 230 executes a handover to a cell (cell C3) that is a handover destination candidate.

(3) Operation of Radio Communication System Next, the operation of the radio communication system 10 will be described. Specifically, an NRT-less handover operation by the eNB 100A and a specific UE identification operation will be described.

(3.1) NRT-less handover FIG. 4 shows an operation flow of NRT-less handover by the eNB 100A. As illustrated in FIG. 4, the eNB 100A receives a handover request from the UE (S10). The eNB 100A receives a handover request including a handover destination candidate cell from the UE. Here, it is assumed that the UE is connected to the cell C1.

  The eNB 100A determines whether or not the UE requesting handover is a specific UE (S20). The determination as to whether or not the UE is a specific UE is performed by any of the functions of the device identification unit 130 described above. In addition, (i) identification using UE's IMEISV or contract type information, (ii) identification by separation of connection destination APN, and (iii) whether or not a specific UE is based on a measurement report from the UE The identification method will be further described later.

  When the UE requesting the handover is the specific UE (UE 200B), the eNB 100A determines to cancel the NRT-less handover (S30). In this case, the eNB 100A performs handover to the handover destination candidate cell (S40), but does not add the handover destination candidate cell (for example, the cell C3) to the neighboring cell information table (NRT).

  On the other hand, when the UE requesting handover is not a specific UE (UE 200A), that is, when it is a normal UE, the eNB 100A performs NRT-less handover (S50).

  Specifically, the eNB 100A executes the handover to the cell even if the handover destination candidate cell (for example, the cell C2) is not registered in the neighbor cell information table (NRT).

  Further, the eNB 100A adds the information on the handover destination candidate cell to the NRT and updates the NRT (S60).

  FIGS. 8A and 8B show configuration examples of the neighboring cell information table (NRT). The NRT shown in FIG. 8A shows a state in which the cells C1 and C2 (see the column of PCI (Physical Cell ID)) are registered. When the eNB 100A receives a handover request with the cell C3 as a handover destination candidate cell from the UE 200B (specific UE) in a state where such an NRT is held, the eNB 100A registers the cell C3 in the NRT. Absent.

  On the other hand, when the eNB 100A receives a handover request from the UE 200A (normal UE) with the cell C3 as a handover destination candidate cell (here, assuming that the UE 200A shown in FIG. 1 has moved to the cell C3 side), the eNB 100A As shown in FIG. 8B, the cell C3 is registered in the NRT.

  Note that the NRT components (IP addresses and the like) shown in FIGS. 8A and 8B are examples, and the present invention is not limited to these.

(3.2) Identification of specific UE Next, a method for identifying a specific UE will be described. Specifically, as described above, the eNB 100A is based on (i) identification using UE's IMEISV (International Mobile Equipment Identity Software Version) or contract type information, and (ii) separation of connection destination APN (Access Point Name). Identification and (iii) identification based on a measurement report from the UE can be performed.

(3.2.1) Operation example 1
FIG. 5 shows a specific UE identification operation flow (operation example 1). As shown in FIG. 5, eNB100A acquires IMEISV or contract classification information (S110). Based on IMEISV or contract type information, the type of UE (whether it is a UE installed in a drone or not) can be identified.

  The eNB 100A determines whether the target UE is a specific UE based on the acquired IMEISV or contract type information (S120).

  When determining that the target UE is the specific UE, the eNB 100A identifies the UE as the specific UE (S130).

(3.2.2) Operation example 2
FIG. 6 shows a specific UE identification operation flow (operation example 2). Hereinafter, parts different from the operation example 1 will be mainly described.

  As illustrated in FIG. 6, the eNB 100A separates a UE connection destination network, specifically, an APN (Access Point Name) according to the type of the UE (S210). That is, the specific UE is separated into an APN associated with the specific UE. Thereby, the classification of UE (whether it is UE mounted in the drone etc.) can be identified.

  The processing of S220 and S230 is the same as that of S120 and S130.

(3.2.3) Operation example 3
FIG. 7 shows a specific UE identification operation flow (operation example 3). Hereinafter, parts different from the operation example 1 will be mainly described.

  As shown in FIG. 7, eNB100A acquires the measurement report (Measurement Report) transmitted from UE (S310).

  The eNB 100A determines whether or not the acquired measurement report includes measurement results for a predetermined number (N) or more of cells (S320). Moreover, eNB100A determines whether the difference of RSRP (Reference Signal Received Power) of a neighboring cell and RSRP of an own cell is below a predetermined value based on the acquired measurement report (S330).

  When the measurement results for a predetermined number (N) or more of cells are included, or when the difference between the RSRP of the neighboring cell and the RSRP of the own cell is equal to or less than a predetermined value, the eNB 100A sets the UE as the specific UE. Identify (S340).

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, when the user equipment (UE200A, 200B) is identified as a specific UE, the eNB100A (eNB100B, 100C) is a neighbor cell information table (NRT) of a cell that is a handover destination candidate reported from the specific UE. Stop adding to.

  For this reason, it is possible to prevent distant cells that cannot be communicated by a normal UE from being added to the NRT. As a result, for all types of UEs including normal UEs, distant cells (for example, cell C3) that are inappropriate handover destination candidates can be avoided from being registered in the NRT. That is, it is possible to avoid a situation in which a normal UE attempts to perform handover to a distant cell that is registered in the NRT but cannot actually communicate.

  On the other hand, in the case of a normal UE, NRT-less handover is executed, and handover destination candidate cells are registered in the NRT.

  That is, according to the eNB 100A, an appropriate NRT can be autonomously generated even when a user device or the like mounted on the drone exists.

  In this embodiment, when the interference level or path loss (reception communication quality) in the plurality of cells acquired by the reception state acquisition unit 120 is within a predetermined range, the UE is identified as a specific UE.

  For this reason, in order to perform communication in the sky, such as UE200B, multiple cells and line-of-sight are improved, and interference levels (interference power) or path loss in multiple cells are within a predetermined range (for example, within xdBm (in the case of interference power), Or, when there is a high possibility that it is within ydB (in the case of path loss), it is possible to identify the UE 200B as a specific UE and limit NRT-less handover.

  In this embodiment, eNB100A can identify the said UE from specific UE, when the information of a predetermined number or more cells is contained in the measurement report reported from UE. Also, the eNB 100A can identify the UE as a specific UE when the RSRP in the own cell to which the UE is connected and the RSRP in a neighboring cell formed in the vicinity (periphery) of the own cell are within a predetermined range.

  For this reason, specific UE can be identified by estimating that the said UE is specific UE based on the measurement result of the reception communication quality in UE. Thereby, it is possible to identify whether or not the UE is a specific UE while conforming to the actual communication environment.

(5) Other Embodiments Although the contents of the present invention have been described above according to the embodiments, the present invention is not limited to these descriptions, and various modifications and improvements are possible. It is obvious to the contractor.

  For example, in the above-described embodiment, the UE 200B is mounted on a drone, but the UE 200B does not necessarily have to be mounted on a flying object such as a drone. That is, the present invention can also be applied to a normal user device. For example, in the case where the user apparatus can execute communication in the sky over a plurality of cells, specifically, when the line-of-sight with the plurality of cells is good and the path loss in the downlink from the plurality of cells is small, The NRT-less handover described above may be canceled. For example, the user apparatus (MTC-UE) connected with the weather sensor, surveillance camera, etc. which were installed in the rooftop of a building etc. is mentioned. In other words, “can perform communication over a plurality of cells” is not limited to a flying object such as a drone, but may include performing communication in a specific place such as a high building with good visibility.

  Furthermore, “in the sky” includes that the user apparatus is located at a place with a good view, such as a high place, unlike a user apparatus that performs communication at a position that is normally used by humans.

  In addition, the block diagrams (FIGS. 2 and 3) used in the description of the above-described embodiment are functional block diagrams. 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 the plurality of devices.

  Further, the above-described eNBs 100A to 100C and UEs 200A and 200B (the device) may function as a computer that performs processing of transmission power control of the present invention. FIG. 9 is a diagram illustrating an example of a hardware configuration of the apparatus. As shown in FIG. 9, the apparatus may be 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.

  Each functional block (see FIGS. 2 and 3) of the apparatus is realized by any hardware element of the computer apparatus or a combination of the hardware elements.

  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.

The memory 1002 is a computer-readable recording medium such as a ROM (Read
It may be configured by at least one of only memory (EPROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), random access memory (RAM), and the like. 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) that can execute the method according to the above-described embodiment, a software module, and the like.

  The storage 1003 is a computer-readable recording medium such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, 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 recording medium described above may be, for example, a database including a memory 1002 and / or a storage 1003, a server, or other suitable medium.

  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.

  The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. Note that 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 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 notification of information is not limited to the above-described embodiment, and may be performed by other methods. For example, the information notification may be physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB ( Master Information Block), SIB (System Information Block)), other signals, or combinations thereof, and RRC signaling may also be referred to as RRC messages, eg, RRC Connection Setup message, RRC It may be a Connection Reconfiguration message.

  Furthermore, the input / output information may be stored in a specific location (for example, a memory) or may be managed by a management table. The input / output information can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

  As long as there is no contradiction, the order of the sequences and flowcharts in the above-described embodiments may be changed.

  In the above-described embodiment, the specific operation that is performed by the eNB 100A (eNB 100B, 100C, hereinafter the same) may be performed by another network node (device). Further, the function of the eNB 100A may be provided by a combination of a plurality of other network nodes.

  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, a channel and / or symbol may be a signal (signal) if there is a corresponding description. The signal may be a message. Also, the terms “system” and “network” may be used interchangeably.

  Furthermore, the parameter or the like may be represented by an absolute value, may be represented by a relative value from a predetermined value, or may be represented by other corresponding information. For example, the radio resource may be indicated by an index.

  The eNB 100A (base station) can accommodate one or a plurality of (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, indoor small base station RRH: Remote Radio Head) can also provide communication services.

  The term “cell” or “sector” refers 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. A base station may also be referred to in terms such as a fixed station, NodeB, eNodeB (eNB), access point, femtocell, small cell, and the like.

  UE200A, 200B is 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.

  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.”

  Also, the terms “including”, “comprising” and variations thereof are intended to be inclusive, as well as “comprising”. Further, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  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.

  Throughout this specification, if articles are added by translation, for example, a, an, and the in English, these articles must be clearly indicated not in context. , Including multiple items.

  Although the embodiments of the present invention have been described as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

10 Wireless communication system
100A ~ 100C eNB
110 Radio signal transceiver
120 Reception status acquisition unit
130 Device identification part
140 Handover controller
200A, 200B UE
210 Radio signal transceiver
220 Measurement Report Department
230 Handover execution unit
1001 processor
1002 memory
1003 storage
1004 Communication equipment
1005 Input device
1006 Output device
1007 bus
C1-C3 cells

Claims (4)

Based on cell information reported from the user apparatus, a radio base station that updates the contents of a neighboring cell information table including information on a cell that is a handover destination candidate of the user apparatus,
A device identifying unit for identifying whether or not the user device is a specific user device capable of performing communication in the sky of a plurality of cells;
A handover control unit for canceling addition of a cell serving as a handover destination candidate reported from the specific user device to the neighboring cell information table when the user identification unit is identified by the device identification unit; A wireless base station.   2. The radio base according to claim 1, wherein the device identification unit identifies the user device from the specific user device when the measurement report reported from the user device includes information of a predetermined number of cells or more. Bureau.   The device identification unit, when the Reference Signal Received Power in the own cell to which the user device is connected and the Reference Signal Received Power in a neighboring cell formed in the vicinity of the own cell are within a predetermined range, the user device The radio base station according to claim 1, wherein the radio base station is identified from the specific user apparatus. A wireless communication method for updating the content of a neighbor cell information table including information on a cell that is a handover destination candidate of the user device based on cell information reported from the user device,
Identifying whether the user device is a specific user device capable of performing communication in the sky of a plurality of cells;
When the user apparatus is identified as the specific user apparatus, the wireless communication method includes a step of canceling addition of a cell that is a handover destination candidate reported from the specific user apparatus to the neighboring cell information table.

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