JP6501828B2 - Base station, mobile communication system and handover control method - Google Patents

Description

  The present invention relates to a base station, a mobile communication system, and a handover control method.

  Conventionally, in a cellular mobile communication system, when a mobile station in communication in a serving cell moves to another neighboring cell, the mobile station is measured based on the measurement report of the reception quality indicator transmitted from the mobile station. There is known handover control in which a base station connected to communicate is switched to a base station of a neighboring cell to continue communication (see, for example, non-patent documents 1 to 3).

  In addition, a technology to reduce the delay in transmission and reception of application data by examining a data processing device (hereinafter also referred to as "MEC (Mobile Edge Computing) device") that processes application data of mobile stations is considered (Non-Patent Documents 4 and 5).

3GPP TS 36.300 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2; Protocol specification" V9.10.0 3GPP TS 36.331 "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification" V9.1 8.0 3GPP TS 36.331 "Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer; Measurements" (Release 13) Milan Patel et al, "Mobile-Edge Computing" Mobile-Edge Computing-Introductory Technical White Paper, Mobile-Edge Computing (MEC) industry initiative, [Online] Sept. 2014, [June 13, 2017 search], Internet <URL: https://portal.etsi.org/portals/0/tbpages/mec/docs/mobile-edge_computing_-_introductory_technical_white_paper_v1%2018-09-14.pdf> Yun Chao Hu, Milan Patel, Dario Sabella, Nurit Sprecher and Valerie Young, "Mobile Edge Computing A key technology towardss 5G", First Edition, ETSI White Paper, No. 11, [Online] Sept. 2015, [September 6, 2017 March 13 Search], Internet <URL: http://www.etsi.org/images/files/ETSIWhitePapers/etsi_wp11_mec_a_key_technology_towards_5g.pdf>

  The above-mentioned conventional handover control is not control based on data communication performance such as actual transmission delay and throughput, so there is a possibility that the cell will not be connected to the cell where the data communication performance is maximized. For example, when a mobile station located in a cell of a base station in which the MEC apparatus is disposed in the vicinity uses a communication service or session involving data processing by the MEC apparatus, the MEC is determined based on the reception quality indicator. When handover is performed to the cell of the base station in which the device is not disposed, the transmission delay characteristic of data communication may be degraded as compared to that before the handover.

A mobile communication system according to an aspect of the present invention is a mobile communication system that controls a handover between a plurality of types of cells based on a reception quality indicator of a mobile wireless communication apparatus, and the mobile type communication target of handover control. The data communication performance obtained or expected in the wireless communication apparatus differs from one another among the plurality of types of cells, and a specific type of data communication performance corresponding to the communication service or session used by the wireless communication apparatus can be obtained. The wireless communication device is preferentially connected to the cell.
In the mobile communication system, frequency bands used by the plurality of types of cells are different from one another, and a frequency band of the specific type of cell is set as a frequency band used for a communication service or session used by the wireless communication device. It is also good.
Further, in the mobile communication system, the data communication performance may be at least one of a transmission delay characteristic and a throughput in data communication by the wireless communication device.
Further, in the mobile communication system, the specific type of cell is located in the cell, inside the base station of the cell, in the vicinity of the base station of the cell or between the base station of the cell and the core network. It may be a cell in which a data processing apparatus for processing data transmitted and received in data communication by the wireless communication apparatus is disposed.
Further, in the mobile communication system, the preferential connection to the specific type of cell may be controlled based on the reception quality indicator in a used frequency band of the specific type of cell and a predetermined threshold.
Further, in the mobile communication system, control for preferentially connecting the wireless communication device to the specific type of cell is mobile wireless communication using a communication service for prioritizing data communication performance in data communication by the wireless communication device. It may apply only to the device or session.
Further, in the mobile communication system, the control for preferentially connecting the wireless communication device to the specific type of cell is a mobile type capable of handover among the plurality of cells regardless of the communication service used by the wireless communication device. The present invention may be applied to a wireless communication device.
In the mobile communication system, the reception quality indicator may be RSRP, RSRQ or RS-SINR.
In the mobile communication system, the mobile radio communication apparatus may be a mobile station or a mobile base station.

  A base station according to another aspect of the present invention is a base station of a mobile communication system that controls a handover of the wireless communication device based on a reception quality indicator of the mobile wireless communication device, and the mobile station as a handover control target Data communication performance obtained or expected in a wireless communication apparatus of the second type differs from one another among the plurality of types of cells, and a specific type of cell corresponding to a communication service or session used for data communication in the wireless communication apparatus Control to preferentially connect the wireless communication apparatus.

  A handover control method according to still another aspect of the present invention is a handover control method of a mobile communication system for controlling a handover based on reception quality indicator information of a mobile wireless communication device, which is the mobile type handover control target. The data communication performance obtained or expected in the wireless communication device is different among the plurality of types of cells, and the specific type of cell corresponding to the communication service or session used for data communication in the wireless communication device The wireless communication apparatus is controlled to be preferentially connected.

  According to the present invention, the wireless communication device performs data communication by preferentially connecting the wireless communication device to a specific type of cell in which data communication performance corresponding to the communication service or session used by the wireless communication device can be obtained. Since it is possible to suppress the deterioration of data communication performance when performing the above, it is possible to suppress the deterioration of data communication performance at the time of handover.

Explanatory drawing which shows schematic structure of the mobile communication system of the overlay cell structure which concerns on one Embodiment of this invention. 6 is a flowchart showing an example of handover control of a base station according to the present embodiment. FIG. 5 is a sequence diagram showing an example of handover control in the mobile communication system according to the present embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Although the embodiment of the present invention will be described here on the premise of application to LTE (Long Term Evolution) / LTE-Advanced, the concept of the present invention is applied to any system if it is a system using a similar cell configuration. Is also applicable.

  FIG. 1 is an explanatory view showing a schematic configuration of a mobile communication system having an overlay cell configuration according to an embodiment of the present invention. Although FIG. 1 shows the case where two small cells are superimposed on the macro cell, the present invention relates to the case where one small cell is superimposed on the macro cell, and three or more small cells to the macro cell. Can be applied in the same manner as above.

  In FIG. 1, the mobile communication system according to this embodiment is a cellular mobile communication system conforming to the above-mentioned LTE / LTE-Advanced specification, and is a macrocell base station (eNB) 111, 112 as a first base station. And a small cell base station (sNB) 121 to 124 as a second base station.

  Each of the base stations 111, 112, and 121 to 124 is connected to the core network 140 of the mobile communication network via a backhaul circuit composed of a predetermined interface. The small cells 121A and 122A of the small cell base stations 121 and 122 overlap the macrocell 111A of the macrocell base station 111, and the small cells 123A and 124A of the small cell base stations 123 and 124 overlap the macrocell 112A of the macrocell base station 112. doing. The small cell base stations 121 to 124 are respectively disposed so that the small cells 121A to 124A continuously cover the area along the road 200 of the moving path, and are vehicles moving on the road 200 (cars (cars) , A truck, a bus, etc.) 210 can communicate with the mobile station 10 as a mobile wireless communication device.

  The mobile station 10 mounted on the automobile 210 is also generally called UE (User Equipment) in LTE / LTE-Advanced. When the mobile station 10 is located in the small cells 121A to 124A of the small cell base stations 121 to 124 and the macro cells 111A and 112A of the macrocell base stations 111 and 112, the small cell base station 121 corresponding to the existing cells. It is possible to wirelessly communicate with the macrocell base stations 111 and 112 and the macrocell base stations 111 and 112 using a predetermined communication scheme and resources.

  In the present embodiment, the case where the mobile unit carrying the mobile station 10 is the automobile 210 will be described, but the mobile unit in the present embodiment is not only the automobile 210 but also a railway vehicle traveling on a track, an aircraft or a ship. It may be The mobile wireless communication device mounted on the automobile 210 is a mobile type that forms a mobile cell (hereinafter referred to as "moving cell") that covers at least the outer peripheral area of the automobile 210 and the interior of the automobile 210. It may be a base station. The mobile base station relays communication between the mobile station (user apparatus) located in the moving cell and the macrocell base stations 111 and 112 and the small cell base stations 121 to 124, which are fixed base stations. The moving cell may include an outer peripheral area of the automobile 210 and an inner area of the automobile 210. In addition, the cell diameter of the moving cell is, for example, 100 m, and may be 20 m or less and 50 m or less.

  The small cell base stations 121 to 124 have a transmission power of, for example, 1 W or less and have a wireless communication range of about several meters to several hundreds meters (for example, about several tens of meters), unlike the wide area macrocell base stations. It is a small-capacity base station that can be installed indoors at homes, stores, offices, etc. The small cell base station is called a “femto base station” or “Home e-Node B” because it is provided to cover an area smaller than the area covered by a wide area macro cell base station in the mobile communication network. It may be called "Home eNB". The small cell base station is connected to the core network 140 of the mobile communication network via a communication line such as a line termination device and a broadband public communication line such as an ADSL (Asymmetric Digital Subscriber Line) line or an optical line, and other base stations Also, communication with various nodes such as server devices on the core network 1040 is possible by a predetermined communication interface.

  The macro cell base stations 111 and 112 have a transmission power of, for example, about 10 W, and have a wide area covering a macro cell which is a wide area of about several hundred meters to several kilometers, which is usually installed outdoors in a mobile communication network. It is a base station, and may be called "Macro e-Node B", "MeNB" or the like. The macro cell base station is connected to another base station by, for example, a wired communication line, and can communicate with a predetermined communication interface. Further, the macro cell base station is connected to the core network 140 of the mobile communication network via communication lines such as a line termination device and a dedicated line, and performs predetermined communication with various nodes such as a server device on the core network 140. Communication is enabled by the interface.

  The base station apparatus of each of the small cell base stations 121 to 124 and the macro cell base stations 111 and 112 includes, for example, hardware such as a computer apparatus having a CPU and a memory, an external communication interface unit for the core network 140, and a wireless communication unit. Configured to execute a predetermined program to execute handover control to be described later, or to perform wireless communication with a mobile station as a user terminal using a predetermined communication scheme and a wireless communication resource can do.

  In the present embodiment, the small cell base stations 121 to 124 and the macro cell base stations 111 and 112 use different frequency bands and wireless communication schemes. For example, the small cell base stations 121 to 124 use the frequency band (2.5 GHz band) of the band 41 and move by the TD-LTE method combining TDD (Time Division Duplex) technology with LTE (Long Term Evolution). It communicates wirelessly with the station 10. Further, for example, the macro cell base stations 111 and 112 use the frequency band of band 1 (2.1 GHz band), and communicate with the mobile station 10 by the FD-LTE system combining the LTE and the FDD (frequency division duplex) technology. Do.

  Further, in the present embodiment, data transmitted / received by data communication by the mobile station 10 located in the small cells 121A to 124A in the vicinity of the small cell base stations 121 to 124 (for example, data of a communication application related to automobiles) The MEC (Mobile Edge Computing) servers 151 to 154 are provided as data processing devices for processing data. On the other hand, no MEC server is provided in the vicinity of the macro cell base stations 111 and 112 in the present embodiment. In this embodiment, the MEC server is provided in the vicinity of the small cell base stations 121 to 124. However, instead of providing the MEC server in the vicinity of the small cell base stations 121 to 124, the macro cell base stations 111 and 112 are provided. It may be provided in the vicinity of

  The MEC servers 151 to 154 may be provided inside the small cell base stations 121 to 124, respectively, or may be provided between the small cell base stations 121 to 124 and the core network 140. Further, as a communication application related to vehicles, there is a V2X (Vehicle-to-everything) communication application which is communication between vehicles and various objects. V2X communication applications include V2N (Vehicle-to-cellular-Network) applications, V2V (V2V: Vehicle-to-Vehicle) applications, and V2I (V2I: Vehicles). -to-roadside-Infrastructure) application, Vehicle-to-Pedestrian (V2P) application, etc. are included.

  The MEC servers 151 to 154 are disposed closer (mobile edge) to the mobile station 10 which is a user terminal, and function as a computing resource that processes data transmitted / received by an application executed on the mobile station 10. The data processing requested from the mobile station 10 is executed by the MEC servers 151 to 154, and the data communication from the mobile station 10 is looped back by the MEC server, thereby performing processing at the data center or server on the core network 140. As a result, the communication distance of data communication is shortened (the number of hops of a router to be transmitted is reduced), so that delay of End-to-End can be suppressed to realize low-delay data communication.

  As described above, the MEC servers 151 to 154 are provided in the vicinity of the small cell base stations 121 to 124, respectively, and the MEC server is not provided in the vicinity of the macro cell base stations 111 and 112. The data communication performance obtained or expected in the above is different between the small cells 121A to 124A and the macro cells 111A and 112A, which are among a plurality of types of cells.

  The handover control when the mobile station 100 moves between cells in the mobile communication system of this embodiment is performed based on the measurement report of the reception quality indicator as a connected cell selection indicator measured by the mobile station 10. Normally, RSRP (Reference Signal Received Power) is used as a reception quality indicator related to handover control between multiple cells in the same frequency band, but in particular, cells of multiple types of used frequency bands are mixed as in this embodiment. In the mobile communication system, RSRQ (Reference Signal Received Quality) or RS-SINR (Reference Signal-Signal-to-Interference-plus-Noise-power Ratio) is used as a reception quality indicator. The base station of the serving cell of the handover source to which the mobile station is connected determines whether or not to handover to the neighboring cell based on the measurement report of the reception quality indicator (RSRQ or RS-SINR) received from the mobile station.

  In the example of FIG. 1, in the areas 131A and 132A in the vicinity of the macrocell base stations 111 and 112 at the end of the small cells 121A to 124A, the reception quality (RSRQ, RS-SINR) of the macrocell is better than the small cells. Therefore, although it is in the small cell area, higher throughput is generally expected when performing handover to the macro cell.

  However, conventional handover control is not handover control based on data communication performance such as actual data transmission delay and throughput, so that an optimal cell is not necessarily selected from the viewpoint of actual delay characteristics and throughput. For example, in the example of FIG. 1, data communication is performed when the small cell base station 121 to which the MEC server 151 is disposed and connected immediately below is handed over to the macrocell base station 111 to which the MEC server is not directly connected. The end-to-end delay characteristic of the mobile station 10 is degraded. When the MEC server is connected only to the macro cell, the opposite relationship is obtained. For example, when a MEC server is handed over from a macrocell base station located directly below and connected to a small cell base station where the MEC server is not directly below, the end-to-end of the mobile station 10 performing data communication Delay characteristics are degraded.

  Therefore, in the present embodiment, handover control is performed so that the mobile station 10 is preferentially connected to a specific type of cell in which the data communication performance corresponding to the communication service or session used for data communication in the mobile station 10 can be obtained. Is going. For example, as a use frequency band for a communication service or session such as V2X involving data processing by MEC servers 151 to 154, a use frequency band (for example, band 41) of small cells 121A to 124A in which MEC servers 151 to 154 are arranged. Prioritize. Thereby, when the mobile station 10 uses a communication service or session such as V2X accompanied by data processing by the MEC servers 151 to 154, the mobile station 10 can operate in the small cells 121A to 124A in which the MEC servers 151 to 154 are arranged. Handover control can be performed so as to connect them preferentially. By thus preferentially connecting to the small cells 121A to 124A in which the MEC servers 151 to 154 are arranged, it is possible to suppress the degradation of the end-to-end delay characteristics of the mobile station 10 performing data communication. The degradation of data communication performance at the time of handover can be suppressed.

  FIG. 2 is a flowchart showing an example of handover control of the base station according to the present embodiment. The example of FIG. 2 is an example in the case where the small cell base station 121 in which the MEC server 151 is disposed immediately below is a handover (HO) source base station.

  In FIG. 2, the HO source base station (small cell base station 121) is required to have a specific communication service (for example, the above-mentioned V2X communication service) and session for which high data communication characteristics (for example, low latency of data communication) are required. A preferential use frequency band to be used preferentially to the above is set (S101).

  The HO source base station acquires information on the communication service and session used by the target mobile station 10 located in the small cell 121A and connected to the HO source base station (S102), and the mobile station 10 It is determined whether the communication service of the mobile station 10 is the specific communication service (S103), and if it is not the specific communication service, it is determined whether the session of the mobile station 10 is the specific session (S104).

  If the communication service of the mobile station 10 is the specific communication service or if the session of the mobile station 10 is the specific session (Yes in S103 and S104), the HO source base station receives the measurement report received from the mobile station. Based on (MR), it is determined whether the reception quality indicator (for example, RSRP, RSRQ or RS-SINR) of the preferential use frequency band is equal to or more than a predetermined threshold (S105).

  If the reception quality indicator of the preferential use frequency band is equal to or higher than the threshold, the HO source base station connects the mobile station 10 to a neighboring cell of the preferential use frequency band (for example, the small cell 122A located immediately below the MEC server 152). Control is performed (S106).

  On the other hand, when the communication service of the mobile station 10 is not the specific communication service and the session of the mobile station 10 is not the specific session (S103, S104 No), or the reception quality indicator of the preferential use frequency band is less than the threshold In this case, the HO source base station controls the mobile station 10 to connect to the neighboring cells (for example, the macro cell 111A or the small cell 122A having a high reception quality indicator) determined based on the normal reception quality measurement report (MR). To do (S107).

  In the example of FIG. 2, a cell of a priority frequency band in which an MEC server is arranged for only a mobile station or session using a communication service (for example, the V2X communication service described above) giving priority to low latency of data communication. The priority connection control for preferentially connecting the mobile station 10 to the above is applied, but it is assumed that a frequency band dedicated to communication service (for example, the above-mentioned V2X communication service) for prioritizing low latency of data communication is used. Alternatively, the above priority connection control may be applied to all mobile stations.

  As described above, according to the embodiment of FIGS. 1 and 2, the mobile station 10 is prioritized to the small cells 121A to 124A that can obtain data communication performance corresponding to the communication service or session such as V2X used by the mobile station 10. By connecting them to each other, it is possible to suppress the deterioration of the data communication performance when the mobile station 10 is performing the data communication, so it is possible to suppress the deterioration of the data communication performance at the time of handover.

  FIG. 3 is a sequence diagram showing an example of handover control in the mobile communication system according to the present embodiment. The example of FIG. 3 is an example in the case where the small cell base station 121 in which the MEC server 151 is disposed immediately below is a handover (HO) source base station.

  In FIG. 3, in the HO source base station (small cell base station 121), a priority usage frequency band is set for each communication service used by the mobile station 10. For example, for a communication service (for example, the above-mentioned V2X communication service) that requires high data communication characteristics (for example, low latency of data communication or throughput), the MEC server 151 in the mobile communication system of FIG. The use frequency band (band 41) of the small cells 121A to 124A arranged immediately below 154 is set as the priority use frequency band.

  Next, the HO source base station transmits, to the target mobile station 10, measurement control information including a list indicating the correspondence between the set type of communication service and the priority usage frequency band. The measurement control information includes a peripheral list and information specifying a reception quality indicator to be measured by the mobile station 10.

  Next, on the basis of the measurement control information received from the HO source base station, the mobile station 10 receives the reception quality specified in the measurement control information for the preferential use frequency band corresponding to the communication service used by the mobile station 10. Measure the indicator (eg, RSRP, RSRQ or RS-SINR).

  Here, the mobile station 10 determines whether the measurement result of the reception quality indicator in the preferential use frequency band is equal to or more than a predetermined threshold set in advance, and the measurement result of the reception quality indicator in the preferential use frequency band is equal to or more than the threshold. , Transmit the measurement report to the HO source base station.

  On the other hand, when the measurement result of the reception quality indicator in the preferential use frequency band is less than the threshold, the mobile station 10 does not transmit the measurement report to the HO source base station. As a result, unnecessary transmission of measurement reports (MR) can be reduced, so that the power consumption of the mobile station 10 can be reduced and the uplink (UL) resources from the mobile station to the HO source base station can be effectively used. Can be

  Next, is the HO source base station handed over to the neighboring cells of the preferential use frequency based on the measurement result of the reception quality indicator in the preferential use frequency band included in the measurement report (MR) received from the mobile station 10? Decide whether or not. When it is determined to perform the handover, the HO source base station transmits the handover request to the HO destination base station of the target cell that is a neighboring cell of the preferential use frequency. The HO target base station executes control to receive a handover from the serving cell based on the handover request, and then returns an HO request response to the HO source base station.

  When the HO source base station receives the HO request response from the HO destination base station, the HO source base station transmits an HO command to the mobile station 10. The mobile station 10 becomes able to transmit and receive packet data to and from the core network through the HO destination base station when the HO completion is set to the HO destination base station of the target cell.

  As described above, according to the embodiment of FIGS. 1 and 3, based on the measurement report of the reception quality indicator measured for the priority use frequency band set according to the type of communication service such as V2X used by the mobile station 10. The MEC server is located immediately below the point at which the data communication performance corresponding to the communication service such as V2X used by the mobile station 10 can be obtained by determining the handover to the small cell of the peripheral cell using the preferential use frequency band. Since the mobile station 10 is preferentially connected to the small cells 121A to 124A and the mobile station 10 using communication services such as V2X is performing data communication, deterioration in data communication performance can be suppressed, so It is possible to suppress the deterioration of the data communication performance of

  It should be noted that the processing steps described herein as well as the components of the mobile communication system, base station, mobile station and MEC server may be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

  With regard to hardware implementation, means such as a processing unit used to realize the above processes and components in an entity (for example, various wireless communication devices, Node Bs, computer devices, hard disk drive devices, or optical disk drive devices) One or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processors (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), The processor, controller, microcontroller, microprocessor, electronic device, or other electronic unit designed to perform the functions described herein, computer, or any combination thereof may be implemented.

  Also, for firmware and / or software implementations, means such as processing units used to implement the above components may be programs (eg, procedures, functions, modules, instructions for performing the functions described herein) , Etc.) may be implemented. In general, any computer / processor readable medium tangibly embodying firmware and / or software codes such as a processing unit or the like used to implement the above described processes and components described herein. May be used to implement For example, firmware and / or software code may be stored in memory, for example on a controller, and executed by a computer or processor. The memory may be implemented inside a computer or processor, or may be implemented outside the processor. Also, the firmware and / or software code may be, for example, random access memory (RAM), read only memory (ROM), non-volatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable PROM (EEPROM) ), Computer- and processor-readable media such as FLASH memory, floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage, etc. Good. The code may be executed by one or more computers or processors, and may cause the computers or processors to perform certain aspects of the functionality described herein.

  Additionally, the description of the embodiments disclosed herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

10 Mobile Station (Terminal, User Equipment, Communication Terminal Equipment)
111, 112 Macrocell base station 111A, 112A Macrocell 121, 122, 123, 124 Small cell base station 121A, 122A, 123A, 124A Small cell 131A, 132A Area 140 core network 151, 152, 153, 154 MEC in the vicinity of macrocell base station Server 200 road 210 car

Claims (12)

A mobile communication system controlling handover between a plurality of types of cells based on a reception quality indicator of a mobile wireless communication apparatus,
In the plurality of types of cells, a first cell in which a data processing device that processes application data received from the wireless communication device without transferring it to the core network side is disposed, and the data processing device is not disposed. Including the second cell,
The base station of one of the first cell and the second cell is located in the other cell,
Communication service or session are used in the wireless communication device of the handover target, the application data when the low-delay communication is a specific communication service or session requested, the first than the second cell as the handover destination A mobile communication system characterized in that the wireless communication device is preferentially connected to a cell . In the mobile communication system of claim 1,
The first cell and the second cell is different from frequency band used together, as the frequency band used for a particular communication service or session low delay of the application data communication that is utilized by the wireless communication device is required, the A mobile communication system characterized by setting a frequency band of a first cell. In the mobile communication system according to claim 1 or 2,
When the communication service or session used by the wireless communication apparatus to be handed over is a specific communication service or session for which low delay and high throughput of application data communication are required, the first cell may be selected from the first cell rather than the second cell. A mobile communication system characterized in that the wireless communication device is preferentially connected to a cell . The mobile communication system according to any one of claims 1 to 3.
The data processing apparatus, and the interior of the base station of the first cell, characterized in that you are disposed between the base station and the core network in the vicinity or the first cell of the base station of the first cell Mobile communication system. The mobile communication system according to any one of claims 1 to 4.
Mobile communication system, characterized in that based on a reception quality indicator with a predetermined threshold in the use frequency band of the first cell Le, controls the priority connection to the first cell. The mobile communication system according to any one of claims 1 to 5,
The control for preferentially connecting the wireless communication device to the first cell is to apply only to a mobile wireless communication device or session using a communication service that prioritizes low delay performance in data communication by the wireless communication device. Mobile communication system characterized by The mobile communication system according to any one of claims 1 to 5,
The control for preferentially connecting the wireless communication device to the first cell is to apply to a mobile wireless communication device capable of handover between the plurality of types of cells regardless of the communication service used by the wireless communication device. Mobile communication system characterized by The mobile communication system according to any one of claims 1 to 7.
The mobile communication system, wherein the reception quality indicator is RSRP, RSRQ or RS-SINR. The mobile communication system according to any one of claims 1 to 8.
The mobile radio communication apparatus is a mobile station. The mobile communication system according to any one of claims 1 to 8.
The mobile radio communication apparatus is a mobile base station. A base station of a mobile communication system for controlling handover between a plurality of types of cells based on a reception quality indicator of a mobile wireless communication apparatus,
In the plurality of types of cells, a first cell in which a data processing device that processes application data received from the wireless communication device without transferring it to the core network side is disposed, and the data processing device is not disposed. Including the second cell,
The base station of one of the first cell and the second cell is located in the other cell,
Handover target the wireless communication device communication service or session has been used in the can, when the low-delay application data communication is a specific communication service or session requested, the first than the second cell as the handover destination A base station characterized by performing control to preferentially connect the wireless communication apparatus to one cell. A handover control method for a mobile communication system, which controls a handover between a plurality of types of cells based on a reception quality indicator of a mobile wireless communication apparatus,
In the plurality of types of cells, a first cell in which a data processing device that processes application data received from the wireless communication device without transferring it to the core network side is disposed, and the data processing device is not disposed. Including the second cell,
The base station of one of the first cell and the second cell is located in the other cell,
Handover target the wireless communication device communication service or session has been used in the can, when the low-delay application data communication is a specific communication service or session requested, the first than the second cell as the handover destination A handover control method comprising: controlling the wireless communication device to be preferentially connected to one cell.

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