JP2008187688A - Communication control device, and communication system - Google Patents

Communication control device, and communication system Download PDF

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Publication number
JP2008187688A
JP2008187688A JP2007022003A JP2007022003A JP2008187688A JP 2008187688 A JP2008187688 A JP 2008187688A JP 2007022003 A JP2007022003 A JP 2007022003A JP 2007022003 A JP2007022003 A JP 2007022003A JP 2008187688 A JP2008187688 A JP 2008187688A
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base station
mobile device
information indicating
information
communication
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JP2007022003A
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Japanese (ja)
Inventor
Hiroshi Kawakami
Takeshi Nakamura
岳 中村
博 川上
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Ntt Docomo Inc
株式会社エヌ・ティ・ティ・ドコモ
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Priority to JP2007022003A priority Critical patent/JP2008187688A/en
Publication of JP2008187688A publication Critical patent/JP2008187688A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication control device and a communication system capable of performing hand-over for suppressing deterioration of communication quality in a whole communication system. <P>SOLUTION: The communication control device 300 controls communication between a mobile device 100, or the like and base stations 200 arranged to make communication areas to overlap (for example, to partially overlap), or the like. A resource management part 302 obtains resource information D2 indicating operating states of the plurality of base stations from the plurality of base stations, respectively, and manages the obtained resource information D2. A mobile device management part 301 obtains terminal information D1 indicating the operating states of the plurality of mobile devices from the plurality of mobile devices, respectively, and manages the obtained terminal information D1. A resource adjusting pat 304 specifies the mobile device and the base station which are made to perform hand-over among the plurality of mobile terminals and the plurality of base stations by using the terminal information D1 and the resource information D2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication control device that controls communication of a mobile device, and a communication system having the communication control device.

Conventionally, a handover technique for maintaining communication regardless of movement of a terminal has been used. Patent Document 1 discloses a technique for forcibly performing handover from the network side.
Japanese translation of PCT publication No. 2004-502363

  However, if a conventional handover technique that merely aims to maintain communication as described in Patent Document 1 is used, communication is concentrated only on a specific base station by performing handover, and for each base station There are cases where the degree of communication congestion varies greatly. For this reason, there is a concern about a decrease in communication quality in the entire communication system. SUMMARY OF THE INVENTION An object of the present invention is to provide a communication control apparatus and a communication system that can perform a handover for suppressing a decrease in communication quality in the entire communication system.

  The present invention is a communication control apparatus that controls communication between a plurality of base stations arranged so that communication ranges overlap with each other and a plurality of mobile devices, and includes base station information indicating operation states of the plurality of base stations. Obtained from each of the plurality of base stations, base station information management means for managing the obtained base station information, and mobile device information indicating the operation status of the plurality of mobile devices from each of the plurality of mobile devices The mobile station information management means for managing the acquired mobile station information, the mobile station and the base station to be handed over among the plurality of mobile stations and the plurality of base stations, the base station information, the mobile station information, Resource adjusting means for specifying using

  The present invention is a communication system for controlling communication between a plurality of base stations arranged so that communication ranges overlap with each other and a plurality of mobile devices, and includes base station information indicating the operation status of the plurality of base stations. Obtained from each of the plurality of base stations, base station information management means for managing the obtained base station information, and mobile station information indicating the operation status of the plurality of mobile stations from each of the plurality of mobile stations The mobile station information management means for managing the acquired mobile station information, the mobile station and the base station to be handed over among the plurality of mobile stations and the plurality of base stations, the base station information and the mobile station information. And resource adjusting means to be specified by use.

  According to the present invention, the resource adjustment unit uses the base station information indicating the operation status of the plurality of base stations and the mobile device information indicating the operation status of the plurality of mobile devices, Therefore, there is no case where communication is concentrated only in a limited number of base stations, and the degree of congestion of communication greatly differs between base stations.

  In the present invention, the resource adjustment means has a plurality of policies for specifying the mobile device and base station to be handed over, and a plurality of information included in each of the base station information and the mobile device information. Of these, the mobile station and base station to be handed over are specified using information according to the policy. Therefore, since the resource adjustment means has a plurality of policies, it is possible to specify the mobile device and base station to be handed over according to each policy.

  In the present invention, the resource adjustment means periodically specifies the mobile device and base station to be handed over. Therefore, the resource adjustment means can identify the mobile device and base station to be periodically handed over.

  In the present invention, the resource adjustment unit specifies the mobile station and base station to be handed over in response to a request from the mobile unit information management unit. Therefore, the resource adjustment unit specifies the mobile device and base station to be handed over in response to a request from the mobile device information management unit, so that a quick handover according to the status of the mobile device is possible.

  In the present invention, the resource adjustment means specifies the mobile station and base station to be handed over in response to a request from the base station information management means. Therefore, the resource adjustment unit specifies the mobile station and the base station to be handed over in response to a request from the base station information management unit, so that a quick handover according to the situation of the base station is possible.

  In the present invention, the mobile device information includes information indicating a type of application for each mobile device, and the resource adjustment means performs the handover based on the mobile device and base station based on the information indicating the type of application. Is identified. Therefore, the mobile device and base station to be handed over can be specified according to the application for each mobile device.

  In the present invention, the mobile device information further includes information indicating a QoS value included in a packet for each mobile device, and the resource adjustment unit performs the handover based on the information indicating the QoS value. And the base station. Therefore, the mobile device and base station to be handed over can be specified according to the QoS value for each mobile device.

  In the present invention, the mobile device information further includes information indicating a traffic status for each mobile device, and the resource adjustment unit determines the mobile device and base station to be handed over based on the information indicating the traffic status. Identify. Therefore, it is possible to specify the mobile device and base station to be handed over according to the traffic situation for each mobile device.

  In the present invention, the mobile device information further includes information indicating a movement status of each mobile device, and the resource adjustment unit determines the mobile device and base station to be handed over based on the information indicating the movement status. Identify. Therefore, it is possible to specify the mobile device and base station to be handed over according to the movement status of each mobile device.

  In the present invention, the mobile device information further includes information indicating the priority order of the mobile device with respect to the handover, and the resource adjustment unit is configured to perform the handover on the mobile device and the base station based on the information indicating the priority order. Is identified. Therefore, it is possible to specify the mobile device and base station to be handed over according to the priority order of the mobile device for handover.

  In the present invention, the mobile device information further includes information indicating charging and service content for each mobile device, and the resource adjustment means performs the handover based on the information indicating the charging and service content. Identify mobile devices and base stations. Therefore, it is possible to specify the mobile device and base station to be handed over according to the charge and service content for each mobile device.

  In the present invention, the mobile device information further includes information indicating a distance from the mobile device to the base station, and the resource adjustment unit moves the handover based on the information indicating the distance to the base station. Identify aircraft and base stations. Therefore, the mobile device and base station to be handed over can be specified according to the distance from the mobile device to the base station.

  In the present invention, the mobile device information further includes information indicating received power for each mobile device, and the resource adjustment unit determines the mobile device and base station to be handed over based on the information indicating the received power. Identify. Therefore, the mobile device and base station to be handed over can be specified according to the received power of each mobile device.

  In the present invention, the mobile device information further includes information indicating a radio interface for each mobile device, and the resource adjustment unit determines the mobile device and base station to be handed over based on the information indicating the radio interface. Identify. Therefore, the mobile device and base station to be handed over can be specified according to the radio interface for each mobile device.

  In the present invention, the base station information further includes information indicating a communication status for each base station, and the resource adjustment means determines the mobile device and base station to be handed over based on the information indicating the communication status. Identify. Therefore, it is possible to specify the mobile device and base station to be handed over according to the communication status of each base station.

  In the present invention, the base station information further includes information indicating a communication method for each base station, and the resource adjustment unit determines the mobile device and base station to be handed over based on the information indicating the communication method. Identify. Therefore, it is possible to specify the mobile device and base station to be handed over according to the communication method for each base station.

  In the present invention, the base station information further includes information indicating a position and a communication range for each base station, and the resource adjustment unit performs the handover based on the information indicating the position and the communication range. And the base station. Therefore, it is possible to specify a mobile device and a base station to be handed over according to the position and communication range for each base station.

  ADVANTAGE OF THE INVENTION According to this invention, the communication control apparatus and communication system which can be handed over for suppressing the fall of the communication quality in the whole communication system can be provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, if possible, the same elements are denoted by the same reference numerals, and redundant description is omitted. The configuration of the communication system 1 according to the embodiment will be described with reference to FIG. The communication system 1 includes a plurality of base stations (base station 200 and base station 201) and a plurality of mobile devices (mobile devices 100 to 103). The base station 200 and the base station 201 are arranged in an overlay, and the communication ranges of the base station 200 and the base station 201 overlap (for example, partially overlap). The base station 200 performs wireless communication with the mobile device 100 and the mobile device 101, and the base station 201 performs wireless communication with the mobile device 102 and the mobile device 103. Mobile device 100 to mobile device 103 are mobile terminals such as mobile phones. Hereinafter, the base station 200 or the like may be simply referred to as a base station, and the mobile device 100 or the like in communication may be simply referred to as a mobile device.

  The communication system 1 further includes a communication control device 300. The communication control device 300 communicates with the base station wirelessly or by wire, and manages wireless communication between the mobile device and the base station. As shown in FIG. 2, the communication control device 300 physically includes a CPU 31, a RAM 32, a ROM 33, an input device 34, an output device 35, a communication device 36, and a recording device 37, which are connected to a bus 38. It is connected. The CPU 31 centrally controls the communication control device 300 by loading predetermined computer software stored in a built-in memory such as the ROM 33 into the RAM 32 and executing it.

  The input device 34 is a data input device and outputs input data to the CPU 31. The output device 35 is a display device such as an LCD, and displays data input from the CPU 31 on the LCD or the like. The communication device 36 has a wireless interface for performing wireless communication with the base station of the communication system 1. The recording device 37 is a readable / writable memory, and stores terminal information D1 (base station information) shown in FIG. 3 and resource information D2 (mobile device information) shown in FIG.

  The terminal information D1 is mobile device information indicating the operation status of a plurality of mobile devices of the communication system 1, and includes application type information D11, QoS information D12, traffic information D13, movement status information D14, user class information D15, and distance information D16. , Charging / service information D17, wireless interface information D18, and received power information D19. The terminal information D1 is created and managed by a mobile unit management unit 301 described later, and the resource information D2 is created and managed by a resource management unit 302 described later.

  The application type information D11 is information indicating the type of application being used for each mobile device. Such application type information D11 is, for example, whether a used application requires a relatively large memory, a relatively small memory is sufficient, or bidirectional communication is necessary. It is information indicating whether one-way communication is necessary, whether it is used in real time via telephone or streaming, or whether it is used in non-real time after downloading.

  The QoS information D12 is information indicating the QoS value included in the packet for each mobile device. The traffic information D13 is traffic pattern information indicating a communication fee, a communication interval, etc. for each mobile device. Such traffic information D13 is information indicating traffic such as the communication volume, communication interval, and error rate of the mobile device. The movement status information D14 is information indicating the degree of movement of the mobile device (for example, the travel distance per unit time) for each mobile device. Such movement status information D14 is information indicating, for example, the moving distance and moving speed of the mobile device.

  The user class information D15 is information indicating which mobile device is a priority device (a mobile device that performs wireless communication with priority over other mobile devices) (or a degree of priority for each mobile device). The distance information D16 is information indicating the distance between the mobile device and the base station for each mobile device. This information is information calculated based on the position measured using GPS, radio wave intensity, etc. in each mobile device.

  The charging / service information D17 is information indicating a charging system and service contents for each mobile device. The radio interface information D18 is information indicating a radio interface for each mobile device. Such wireless interface information D18 is, for example, information indicating a wireless interface in use or a usable wireless interface. The received power information D19 is information indicating received power for each mobile device (received power received by the mobile device from the base station).

  The resource information D2 is base station information indicating the operation status of a plurality of base stations of the communication system 1, and includes resource information D21, communication method information D22, and base station information D23. The resource information D21 is information indicating the bandwidth usage rate, the number of available channels, the delay status, the number of people in use, the error rate, etc. for each base station. The communication method information D22 indicates whether each base station provides communication with a relatively high reliability of a bandwidth guarantee type or whether communication with a relatively low speed but a relatively high speed is provided. It is information to show. The base station information D23 is information indicating the position of each base station, the size of the communication range, and the like.

  Functionally, the communication control apparatus 300 has a mobile unit management unit 301 (mobile unit information management unit), a resource management unit 302 (base station information management unit), an information transmission / reception unit 303, and a resource adjustment unit 304 (resource adjustment unit). Have The mobile device management unit 301 to the resource adjustment unit 304 are functions realized when the CPU 31 executes computer software and operates each component of the communication control device 300 shown in FIG. In particular, the CPU 31 uses the mobile device management unit 301 to the resource adjustment unit 304 to execute processing performed by the communication control device 300 shown in FIG.

  The mobile device management unit 301 acquires terminal information D1 indicating the operation status of a plurality of mobile devices in the communication system 1 from each of the plurality of mobile devices, and manages the acquired terminal information D1 (the terminal information D1 is recorded on the recording device). 37 and reading from the recording device 37).

  The resource management unit 302 acquires resource information D2 indicating the communication status of a plurality of base stations from each of the plurality of base stations, and manages the acquired resource information D2 (stores the resource information D2 in the recording device 37, etc. And updating from the recording device 37). The information transmission / reception unit 303 has a wireless interface for performing wireless or wired communication with the base station.

  The resource adjustment unit 304 specifies the mobile device and base station of the communication system 1 to be handed over using the resource information D2 and the terminal information D1, and instructs the specified mobile device or base station to perform the handover. The resource adjustment unit 304 specifies a mobile device and a base station that perform handover based on the terminal information D1, the resource information D2, and the policy acquired from the resource management unit 302 and the mobile device management unit 301, respectively. This policy is a reference indicating how to allocate resources using handover (hereinafter referred to as radio resource optimization) (that is, which mobile station is handed over to which base station). For example, there are policies that prioritize the reduction of the call loss rate and policies that prioritize users with a high user class. The resource adjustment unit 304 can change the content of the policy according to time, place, etc. (for example, for each base station).

  The resource adjustment unit 304 obtains information required for each policy (information included in the terminal information D1 and resource information D2) in the terminal information D1 and resource information D2 via the resource management unit 302 and the mobile device management unit 301. Get from. The resource adjustment unit 304 optimizes radio resources based on the acquired information and policy. That is, the resource adjustment unit 304 includes a plurality of information (application type information D11 to received power information D19) included in the terminal information D1, and a plurality of information (resource information D21 to base station) included in the resource information D2. Based on at least one of the information D23) and the policy, the mobile device 100 and the base station 200 to be handed over are specified.

  The resource adjustment unit 304 performs the optimization of the radio resource 1) periodically (for example, every 10 seconds), 2) in response to a request from the resource management unit 302, and 3) the mobile device management unit 301. It may be performed in response to a request from, or any one of 1) to 3) may be performed for each item, or any two items may be combined.

  Here, optimization of radio resources by the resource adjustment unit 304 will be described with reference to FIG. The resource adjustment unit 304 calculates the evaluation value P (x, a), the evaluation value Q (y, a), and the evaluation value R (x, y, a) shown in FIG. “X” is a symbol for identifying a mobile device and represents an identification number assigned to each mobile device, and “y” is a symbol for identifying a base station and is an identification assigned to each base station. Represents a number. “A” is a symbol for identifying a policy, and represents an identification number such as “1” or “2” assigned to each policy. As a policy, for example, a policy of “reducing the call loss rate without lowering the evaluation of the user's application satisfaction” (“a” is a policy of “1”) or “a user with a high user class is given priority. A policy for allocating radio resources (a policy in which “a” is “2”), and the like.

  P (x, a) is an evaluation value for the terminal information D1, and the larger the value, the higher the need for handover for the mobile device “x”. Q (y, a) is an evaluation value for the resource information D2, and the larger the value, the higher the need for handover to the base station “y”. R (x, y, a) is an evaluation value for the terminal information D1 and the resource information D2, and the larger the value, the higher the need for handover for the combination of the mobile device “x” and the base station “y”. Show.

  Based on this policy on the premise that congestion has occurred in the base station before the handover and there is a base station in which no congestion has occurred when the policy with “a” is “1” is set. In order to optimize radio resources, application type information D11 and radio interface information D18 are required because of the need to maintain satisfaction with the application before and after handover, and further resource information D21 and communication method information D22 are required. Become. In this way, any information of the terminal information D1 and the resource information D2 (application type information D11 to received power information D19 and resource information D21 to base station information D23) is necessary for radio resource optimization. It depends on the contents of the policy.

  The resource adjustment unit 304 calculates P (x, a) for each mobile device (for all “x”) using the application type information D11 and the wireless interface information D18, and stores it in the recording device 37. Further, the resource adjustment unit 304 calculates Q (y, a) for each base station (for all “y”) using the resource information D21 and the communication method information D22, and stores them in the recording device 37. Then, the resource adjustment unit 304 combines all the calculated P (x, a) and Q (y, a) to evaluate value R (x, y, a) used when optimizing radio resources. = P (x, a) × Q (y, a) is calculated, and the calculated R (x, y, a) is stored in the recording device 37. The resource adjustment unit 304 identifies the largest (highest evaluation value) “x” and “y” from the calculated R (x, y, a) (or R (x, y, a) is predetermined). Mobile station “x” and base station so that the mobile station corresponding to “x” is handed over to the base station corresponding to “y”. “Y” is controlled. In this case, the resource adjustment unit 304 identifies the mobile device and base station to be handed over (optimization of radio resources) based on whether R (x, y, a) exceeds a predetermined reference value. Do it.

  When R (x, y, a) exceeds a predetermined reference value, the mobile device and base station to be handed over are identified as “x” and “y”, respectively, and R (x, y, a) is If it is less than or equal to this reference value, it is determined that there are no mobile devices and base stations to be handed over (no radio resource optimization is performed). Note that policies corresponding to all combinations of all information (application type information D11 to received power information D19) included in terminal information D1 and all information (resource information D21 to base station information D23) included in resource information D2. You may prepare. In this case, radio resources can be optimized in consideration of all resources.

  Next, the operation of the communication system 1 according to the embodiment will be described with reference to FIG. First, the mobile device in communication periodically transmits terminal information D1 related to the mobile device to the base station (step S600). Next, the base station transmits resource information D2 and terminal information D1 obtained from the mobile device to the communication control apparatus 300 (step S601). When receiving the terminal information D1 and the resource information D2 from the base station, the information transmitting / receiving unit 303 of the communication control apparatus 300 transmits the terminal information D1 to the mobile device management unit 301 (step S602), and the resource information D2 is transmitted to the resource management unit 302. (Step S603). The mobile device management unit 301 stores the received terminal information D1 in the recording device 37, and the resource management unit 302 stores the received resource information D2 in the recording device 37. When the terminal information D1 and the resource information D2 are already stored in the recording device 37, the storage terminal information D1 and the resource information D2 are updated to new terminal information D1 and resource information D2.

  Thereafter, when the resource management unit 302 determines based on the resource information D2 that the bandwidth usage rate of the base station exceeds a predetermined reference value due to congestion or the like, for example, the resource management unit 302 performs optimization of the radio resource. The adjustment unit 304 is requested (step S604). For example, when the received power of the mobile device does not satisfy a predetermined reference value, the mobile device management unit 301 requests the resource adjustment unit 304 to optimize the radio resource (step S605). Note that the resource adjustment unit 304 periodically performs radio resource optimization.

  When the resource adjustment unit 304 optimizes the radio resource, the resource adjustment unit 304 is based on a policy set in advance in the resource adjustment unit 304 from among a plurality of pieces of information (application type information D11 to reception power information D19) of the terminal information D1. Necessary information is requested from the mobile device management unit 301 (step S606), and the mobile device management unit 301 transmits the requested information to the resource adjustment unit 304 (step S607). In addition, when the resource adjustment unit 304 optimizes the radio resource, the resource adjustment unit 304 includes a plurality of pieces of information (resource information D21 to base station information D23) of the resource information D2 based on a policy preset in the resource adjustment unit 304. From the resource management unit 302 (step S608), and the resource management unit 302 transmits the requested information to the resource adjustment unit 304 (step S609).

  The resource adjustment unit 304 includes information received from the mobile device management unit 301 in step S607 (information included in the terminal information D1), and information received from the resource management unit 302 in step S609 (information included in the resource information D2). Is used to determine radio resource optimization (identification of a mobile station and a base station to perform handover) based on the policy (step S610).

  In step S610, the resource adjustment unit 304 uses the information received from the mobile device management unit 301 via the information transmission / reception unit 303 in step S607 for each mobile device (all “x”). Further, Q (y, a) is calculated for each base station (for all “y”) using the information received from the resource management unit 302 via the information transmission / reception unit 303 in step S609. )calculate. The resource adjustment unit 304 combines R (x, y, a) = P (x, a) × Q (y, a) by combining all the calculated P (x, a) and Q (y, a). The calculated R (x, y, a) is stored in the recording device 37.

  The resource adjustment unit 304 identifies the largest (highest evaluation value) “x” and “y” from the calculated R (x, y, a) (or R (x, y, a) is predetermined). Mobile station “x” and base station so that the mobile station corresponding to “x” is handed over to the base station corresponding to “y”. “Y” is controlled. As described above, the resource adjustment unit 304 determines whether or not R (x, y, a) exceeds a predetermined reference value for specifying a mobile device and a base station to be handed over (optimization of radio resources). Based on. When R (x, y, a) exceeds a predetermined reference value (YES), the mobile device and base station to be handed over are identified as “x” and “y”, respectively, and R (x, y, When a) is less than or equal to this reference value (NO), it is determined that there are no mobile devices and base stations to be handed over (no radio resource optimization is performed).

  The resource adjustment unit 304 transmits an instruction to hand over to the base station “y” to the mobile device “x” that is the target of handover via the information transmission / reception unit 303 (step S611). Then, the information transmitting / receiving unit 303 transmits the instruction received from the resource adjustment unit 304 in step S611 to the base station communicating with the mobile device “x” (step S612). The transmitted instruction is transmitted to the mobile device “x” (step S613).

  (Modified example) Next, with reference to FIGS. 7-10, the modified example of the communication system 1 which concerns on embodiment is demonstrated. FIG. 7 is a diagram illustrating a configuration of a communication system 1a according to a modification. The communication system 1a includes a communication control device 300a, a wireless control device 400, a wireless control device 401, and mobile devices 100 to 107.

  As shown in FIG. 8, the communication control device 300a physically includes a CPU 31a, a RAM 32a, a ROM 33a, an input device 34a, an output device 35a, a communication device 36a, and a recording device 37a, which are connected to a bus 38a. It is connected. The CPU 31a centrally controls the communication control device 300a by loading predetermined computer software stored in a built-in memory such as the ROM 33a into the RAM 32a and executing it. The input device 34a is a data input device, and outputs input data to the CPU 31a. The output device 35a is a display device such as an LCD, and displays data input from the CPU 31a on the LCD or the like. The communication device 36a has a wireless interface for performing wireless communication with the wireless control device 400 and the wireless control device 401. The recording device 37a is a readable / writable memory, and stores terminal information D1 shown in FIG. 3 and resource information D2 shown in FIG.

  The communication control apparatus 300a is functionally configured by removing the mobile station management unit 301 and the resource management unit 302 from the communication control apparatus 300 of the communication system 1, and as shown in FIG. A resource adjustment unit 304 is included. The information transmission / reception unit 303 and the resource adjustment unit 304 are functions realized when the CPU 31a executes computer software and operates each component of the communication control device 300a illustrated in FIG. In particular, the CPU 31a uses the information transmission / reception unit 303 and the resource adjustment unit 304 to execute processing performed by the communication control device 300a illustrated in FIG.

  The radio network controller 400 includes a management device 400a, a base station 404, and a base station 405. The management device 400a includes a mobile device management unit 402 and a resource management unit 403. The wireless control device 401 includes a management device 401a, a base station 408, and a base station 409, and the management device 401a includes a mobile device management unit 406 and a resource management unit 407. The base station 404 and the base station 405, the mobile device management unit 406, and the resource management unit 407 have the same functions as the base stations (base station 200 and base station 201) of the communication system 1, and Each of the mobile devices 107 has the same function as the mobile device 100 and the like.

  The communication range of the radio network controller 400 includes the communication ranges of the base station 404 and the base station 405, and the communication ranges of the base station 404 and the base station 405 overlap (for example, partially overlap). . The communication range of the wireless control device 401 is composed of the communication ranges of the base station 408 and the base station 409, and the communication ranges of the base station 408 and the base station 409 overlap (for example, partially overlap). . In addition, the communication ranges of the wireless control device 400 and the wireless control device 401 overlap (for example, partially overlap).

  Note that the mobile device management unit 402, the resource management unit 403, the base station 404, and the base station 405 of the wireless control device 400, the mobile device management unit 406, the resource management unit 407, the base station 408, and the base station of the wireless control device 401, respectively. Since each of the stations 409 is the same, only the radio controller 400 will be described below. In the following, the base station 404 or the like may be simply referred to as a base station, and the mobile device 100 or the like that is in communication may be simply referred to as a mobile device.

  As shown in FIG. 9, the management device 400a physically includes a CPU 31b, a RAM 32b, a ROM 33b, an input device 34b, an output device 35b, a communication device 36b, and a recording device 37b, which are connected to a bus 38b. Has been. The CPU 31b centrally controls the communication control device 300b by loading predetermined computer software stored in a built-in memory such as the ROM 33b into the RAM 32b and executing it.

  The input device 34b is a data input device and outputs input data to the CPU 31b. The output device 35b is a display device such as an LCD, and displays data input from the CPU 31b on the LCD or the like. The communication device 36b includes a wireless interface for performing wireless communication with the communication control device 300a, the base station 404, and the base station 405. The recording device 37b is a readable / writable memory, and stores terminal information D1 shown in FIG. 3 and resource information D2 shown in FIG.

  As shown in FIG. 7, the management device 400 a functionally includes a mobile device management unit 402 having the same function as the mobile device management unit 301, and a resource management unit 403 having the same function as the resource management unit 302. Have This configuration of the management device 400a is the same as the configuration in which the information transmission / reception unit 303 and the resource adjustment unit 304 are excluded from the communication control device 300 of the communication system 1. The mobile device management unit 402 and the resource management unit 403 are functions realized when the CPU 31b executes computer software and operates each component of the radio network controller 400a shown in FIG. In particular, the CPU 31b uses the mobile device management unit 402 and the resource management unit 403 to execute processing performed by the radio network controller 400a shown in FIG. Note that the mobile device management unit 402 and the resource management unit 403 may be independent devices.

  Next, the operation of the communication system 1a according to the modification will be described with reference to FIG. First, the mobile device in communication periodically transmits terminal information D1 related to this mobile device to the base station (step S700). Next, the base station transmits resource information D2 to the resource management unit 403 (step S701), and transmits terminal information D1 obtained from the mobile device to the mobile device management unit 402 (step S702). The mobile device management unit 402 stores the received terminal information D1 in the recording device 37b, and the resource management unit 403 stores the received resource information D2 in the recording device 37b. When the terminal information D1 and the resource information D2 are already stored in the recording device 37b, the storage terminal information D1 and the resource information D2 are updated to new terminal information D1 and resource information D2.

  For example, when the resource management unit 403 determines based on the resource information D2 that the bandwidth usage rate of the base station exceeds a predetermined reference value due to congestion or the like, the resource management unit 403 performs optimization of the radio resource. To the information transmitting / receiving unit 303 (step S703). When receiving the signal transmitted in step S703 from the resource management unit 403, the information transmitting / receiving unit 303 transmits this signal to the resource adjustment unit 304 (step S704).

  For example, when the received power of the mobile device does not satisfy a predetermined reference value, the mobile device management unit 402 transmits a signal requesting the resource adjustment unit 304 to optimize the radio resource to the information transmission / reception unit 303 (step S30). S705). Upon receiving the signal transmitted from the mobile device management unit 402 in step S705, the information transmission / reception unit 303 transmits this signal to the resource adjustment unit 304 (step S706). Note that the resource adjustment unit 304 periodically performs radio resource optimization.

  When the resource adjustment unit 304 optimizes the radio resource, the resource adjustment unit 304 is based on a policy set in advance in the resource adjustment unit 304 from among a plurality of pieces of information (application type information D11 to reception power information D19) of the terminal information D1. A signal requesting the mobile station management unit 402 for necessary information is transmitted to the information transmitting / receiving unit 303 (step S707). When the information transmitting / receiving unit 303 receives the signal transmitted from the resource adjustment unit 304 in step S707, Is transmitted to the mobile device management unit 402 (step S708).

  When receiving the signal transmitted in step S708 from the information transmission / reception unit 303, the mobile device management unit 402 transmits the information of the terminal information D1 requested by this signal to the information transmission / reception unit 303 (step S709). 303 receives the information of the terminal information D1 transmitted in step S709, and transmits the received information to the resource adjustment unit 304 (step S710).

  In addition, when the resource adjustment unit 304 optimizes the radio resource, the resource adjustment unit 304 includes a plurality of pieces of information (resource information D21 to base station information D23) of the resource information D2 based on a policy preset in the resource adjustment unit 304. Transmits a signal for requesting necessary information to the resource management unit 302 to the information transmission / reception unit 303 (step S711). When the information transmission / reception unit 303 receives the signal transmitted from the resource adjustment unit 304 in step S711, Is transmitted to the resource management unit 403 (step S712).

  When the resource management unit 403 receives the signal transmitted in step S712 from the information transmission / reception unit 303, the resource management unit 403 transmits the information of the resource information D2 requested by this signal to the information transmission / reception unit 303 (step S713). When the information of the resource information D2 transmitted in step S713 is received, the received information is transmitted to the resource adjustment unit 304 (step S714).

  The resource adjustment unit 304 receives information (information included in the terminal information D1) received from the mobile device management unit 402 via the information transmission / reception unit 303 in step S710, and from the resource management unit 403 via the information transmission / reception unit 303 in step S714. Using the received information (information included in the resource information D2), a determination of radio resource optimization (identification of a mobile device and a base station that performs handover) is performed based on the policy (step S715).

  In step S715, the resource adjustment unit 304 uses the information received from the mobile device management unit 402 via the information transmission / reception unit 303 in step S710 for each mobile device (all “x”). Further, Q (y, a) is calculated for each base station (for all “y”) using the information received from the resource management unit 403 via the information transmission / reception unit 303 in step S714. )calculate.

  The resource adjustment unit 304 combines R (x, y, a) = P (x, a) × Q (y, a) by combining all the calculated P (x, a) and Q (y, a). The calculated R (x, y, a) is stored in the recording device 37. The resource adjustment unit 304 identifies the largest (highest evaluation value) “x” and “y” from the calculated R (x, y, a) (or R (x, y, a) is predetermined). Mobile station “x” and base station so that the mobile station corresponding to “x” is handed over to the base station corresponding to “y”. “Y” is controlled. As described above, the resource adjustment unit 304 determines whether or not R (x, y, a) exceeds a predetermined reference value for specifying a mobile device and a base station to be handed over (optimization of radio resources). Based on. When R (x, y, a) exceeds a predetermined reference value, the mobile device and base station to be handed over are identified as “x” and “y”, respectively, and R (x, y, a) is If it is less than or equal to this reference value, it is determined that there are no mobile devices and base stations to be handed over (no radio resource optimization is performed).

  The resource adjustment unit 304 transmits an instruction to hand over to the base station “y” to the mobile device “x” that is the target of handover via the information transmission / reception unit 303 (step S716). Then, the information transmission / reception unit 303 transmits the instruction received from the resource adjustment unit 304 in step S716 to the base station communicating with the mobile device “x” (step S717). The transmitted instruction is transmitted to the mobile device “x” (step S718).

  Next, operations and effects of the communication system 1 according to the embodiment and the communication system 1a according to the modification will be described. The communication control device 300 of the communication system 1 according to the embodiment communicates with the mobile station 100 to the mobile station 103 and the base station 200 and the base station 201 arranged so that the communication ranges overlap (for example, partially overlap). To control. The resource management unit 302 acquires resource information D2 indicating the operation status of the plurality of base stations from each of the plurality of base stations, and manages the acquired resource information D2. The mobile device management unit 301 acquires terminal information D1 indicating the operation status of a plurality of mobile devices from each of the plurality of mobile devices, and manages the acquired terminal information D1. The resource adjustment unit 304 uses the terminal information D1 and the resource information D2 to specify a mobile device and a base station to be handed over among a plurality of mobile devices and a plurality of base stations.

  In addition, the communication system 1a according to the modified example includes a plurality of base stations 404, a base station 405, and a base station 408 that are arranged such that the communication ranges overlap (for example, partially overlap) with the mobile devices 100 to 107. And control communication with the base station 409. The resource management unit 403 acquires resource information D2 indicating the operation status of the plurality of base stations from each of the plurality of base stations, and manages the acquired resource information D2. The mobile device management unit 402 acquires terminal information D1 indicating the operation status of a plurality of mobile devices from each of the plurality of mobile devices, and manages the acquired terminal information D1. The resource adjustment unit 304 uses the terminal information D1 and the resource information D2 to specify a mobile device and a base station to be handed over among a plurality of mobile devices and a plurality of base stations.

  Therefore, the resource adjustment unit 304 identifies the mobile device and the base station to be handed over using the resource information D2 indicating the operation status of the plurality of base stations and the terminal information D1 indicating the operation status of the plurality of mobile devices. Therefore, the case where communication is concentrated only in a limited number of base stations and the degree of communication congestion varies greatly from base station to base station does not occur.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource adjustment unit 304 has a plurality of policies for specifying a mobile device and a base station to be handed over, and resource information D2 and A mobile device and a base station to be handed over are specified using information according to a policy among a plurality of pieces of information included in each of the terminal information D1. Therefore, since the resource adjustment unit 304 has a plurality of policies, it is possible to specify a mobile device and a base station to be handed over according to each policy.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource adjustment unit 304 periodically specifies a mobile device and a base station to be handed over. Therefore, the resource adjustment unit 304 can identify a mobile device and a base station that are periodically handed over.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource adjustment unit 304 performs handover according to a request from the mobile device management unit 301 (mobile device management unit 402). Identify the station. Therefore, the resource adjustment unit 304 identifies a mobile device and a base station to be handed over in response to a request from the mobile device management unit 301 (mobile device management unit 402), so that a quick handover according to the state of the mobile device can be performed. It becomes possible.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource adjustment unit 304 determines a mobile device and a base station to be handed over in response to a request from the resource management unit 302 (resource management unit 403). Identify. Therefore, the resource adjustment unit 304 identifies a mobile device and a base station to be handed over in response to a request from the resource management unit 302 (resource management unit 403), so that a quick handover according to the situation of the base station is possible. Become.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 includes information indicating the type of application for each mobile device, and the resource adjustment unit 304 determines the type of application. Based on the information shown, the mobile station and base station to be handed over are identified. Therefore, the mobile device and base station to be handed over can be specified according to the application for each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information indicating the QoS value included in the packet for each mobile device, and the resource adjustment unit 304 Based on the information indicating the QoS value, the mobile station and base station to be handed over are specified. Therefore, the mobile device and base station to be handed over can be specified according to the QoS value for each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information indicating the traffic status for each mobile device, and the resource adjustment unit 304 indicates the traffic status. Based on the information, the mobile station and base station to be handed over are specified. Therefore, it is possible to specify the mobile device and base station to be handed over according to the traffic situation for each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information indicating the movement status of each mobile device, and the resource adjustment unit 304 indicates the movement status. Based on the information, the mobile station and base station to be handed over are specified. Therefore, it is possible to specify the mobile device and base station to be handed over according to the movement status of each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modified example, the terminal information D1 further includes information indicating the priority order of the mobile station with respect to the handover, and the resource adjustment unit 304 indicates this priority order. Based on the information shown, the mobile station and base station to be handed over are identified. Therefore, it is possible to specify the mobile device and base station to be handed over according to the priority order of the mobile device for handover.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information for each mobile device and information indicating the content of the service. The mobile station and base station to be handed over are identified based on the information indicating the contents of the service. Therefore, it is possible to specify the mobile device and base station to be handed over according to the charge and service content for each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information indicating the distance from the mobile device to the base station, and the resource adjustment unit 304 The mobile station and base station to be handed over are identified based on the information indicating the distance to the mobile station. Therefore, the mobile device and base station to be handed over can be specified according to the distance from the mobile device to the base station.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information indicating reception power for each mobile device, and the resource adjustment unit 304 indicates this reception power. Based on the information, the mobile station and base station to be handed over are specified. Therefore, the mobile device and base station to be handed over can be specified according to the received power of each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the terminal information D1 further includes information indicating a radio interface for each mobile device, and the resource adjustment unit 304 indicates this radio interface. Based on the information, the mobile station and base station to be handed over are specified. Therefore, the mobile device and base station to be handed over can be specified according to the radio interface for each mobile device.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource information D2 further includes information indicating a communication status for each base station, and the resource adjustment unit 304 indicates this communication status. Based on the information, the mobile station and base station to be handed over are specified. Therefore, it is possible to specify the mobile device and base station to be handed over according to the communication status of each base station.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource information D2 further includes information indicating a communication method for each base station, and the resource adjustment unit 304 indicates this communication method. Based on the information, the mobile station and base station to be handed over are specified. Therefore, it is possible to specify the mobile device and base station to be handed over according to the communication method for each base station.

  Furthermore, in the communication system 1 according to the embodiment and the communication system 1a according to the modification, the resource information D2 further includes information indicating a position and a communication range for each base station. Based on the information indicating the communication range, the mobile station and base station to be handed over are specified. Therefore, it is possible to specify a mobile device and a base station to be handed over according to the position and communication range for each base station.

It is a figure which shows the structure of the communication system which concerns on embodiment. It is a figure which shows the structure of the communication control apparatus which concerns on embodiment. It is a figure which shows the content of the terminal information which concerns on embodiment. It is a figure which shows the content of the resource information which concerns on embodiment. It is a figure which shows the evaluation value used in the case of the optimization of a radio | wireless resource. It is a sequence for demonstrating operation | movement of the communication system which concerns on embodiment. It is a figure which shows the structure of the communication system which concerns on a modification. It is a figure which shows the structure of the communication control apparatus which concerns on a modification. It is a figure which shows the structure of the management apparatus which concerns on a modification. It is a sequence for demonstrating operation | movement of the communication system which concerns on a modification.

Explanation of symbols

  D1 terminal information, D11 ... application type information, D12 ... QoS information, D13 ... traffic information, D14 ... movement status information, D15 ... user class information, D16 ... distance information, D17 ... billing / service information, D18 ... wireless interface information, D19 ... Received power information, D2 ... Resource information, D21 ... Resource information, D22 ... Communication method information, D23 ... Base station information, 1, 1a ... Communication system, 100, 101, 102, 103, 104, 105, 106, 107 ... mobile devices, 200, 201, 404, 405, 408, 409 ... base stations, 300, 300a ... communication control devices, 301, 402, 406 ... mobile device management units, 302, 403, 407 ... resource management units, 303 ... Information transmitter / receiver 304, resource adjusting unit 31, 31a, 31b, CPU 32 32a, 32b ... RAM, 33, 33a, 33b ... ROM, 34, 34a, 34b ... input device, 35, 35a, 35b ... output device, 36, 36a, 36b ... communication device, 37, 37a, 37b ... recording device, 38, 38a, 38b ... bus, 400, 401 ... wireless control device, 400a, 401a ... management device.

Claims (34)

  1. A communication control device that controls communication between a plurality of base stations arranged so that communication ranges overlap and a plurality of mobile devices,
    Base station information indicating the operation status of the plurality of base stations is acquired from each of the plurality of base stations, base station information management means for managing the acquired base station information,
    Mobile device information management means for acquiring mobile device information indicating the operation status of the plurality of mobile devices from each of the plurality of mobile devices, and managing the acquired mobile device information;
    Resource adjustment means for identifying a mobile device and a base station to be handed over among the plurality of mobile devices and the plurality of base stations using the base station information and the mobile device information. Control device.
  2.   The resource adjustment means has a plurality of policies for specifying a mobile device and a base station to be handed over, and the policy is included in a plurality of pieces of information included in each of the base station information and the mobile device information. 2. The communication control apparatus according to claim 1, wherein the mobile station and the base station to be handed over are specified using the corresponding information.
  3.   The communication control apparatus according to claim 1, wherein the resource adjustment unit periodically specifies the mobile device and base station to be handed over.
  4.   The communication according to any one of claims 1 to 3, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over in response to a request from the mobile unit information management unit. Control device.
  5.   The communication according to any one of claims 1 to 4, wherein the resource adjustment unit specifies the mobile device and the base station to be handed over in response to a request from the base station information management unit. Control device.
  6. The mobile device information includes information indicating the type of application for each mobile device,
    The communication control apparatus according to any one of claims 1 to 5, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating a type of the application. .
  7. The mobile device information further includes information indicating a QoS value included in a packet for each mobile device,
    The communication control apparatus according to any one of claims 1 to 6, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the QoS value.
  8. The mobile device information further includes information indicating a traffic situation for each mobile device,
    The communication control apparatus according to any one of claims 1 to 7, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the traffic situation.
  9. The mobile device information further includes information indicating the movement status of each mobile device,
    The communication control apparatus according to any one of claims 1 to 8, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the movement status.
  10. The mobile device information further includes information indicating the priority order of the mobile device for handover,
    The communication control apparatus according to any one of claims 1 to 9, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the priority order.
  11. The mobile device information further includes information indicating charging and service contents for each mobile device,
    The communication according to any one of claims 1 to 10, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the contents of the charging and service. Control device.
  12. The mobile device information further includes information indicating a distance from the mobile device to the base station,
    The communication according to any one of claims 1 to 11, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating a distance to the base station. Control device.
  13. The mobile device information further includes information indicating received power for each mobile device,
    The communication control apparatus according to any one of claims 1 to 12, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the received power.
  14. The mobile device information further includes information indicating a wireless interface for each mobile device,
    The communication control apparatus according to any one of claims 1 to 13, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the radio interface.
  15. The base station information further includes information indicating a communication status for each base station,
    The communication control apparatus according to any one of claims 1 to 14, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the communication status.
  16. The base station information further includes information indicating a communication method for each base station,
    The communication control apparatus according to any one of claims 1 to 15, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the communication method.
  17. The base station information further includes information indicating a position and a communication range for each base station,
    The communication control according to any one of claims 1 to 16, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the location and a communication range. apparatus.
  18. A communication system for controlling communication between a plurality of base stations arranged so that communication ranges overlap and a plurality of mobile devices,
    Base station information indicating the operation status of the plurality of base stations is acquired from each of the plurality of base stations, base station information management means for managing the acquired base station information,
    Mobile device information management means for acquiring mobile device information indicating the operation status of the plurality of mobile devices from each of the plurality of mobile devices, and managing the acquired mobile device information;
    Resource adjustment means for identifying a mobile device and a base station to be handed over among the plurality of mobile devices and the plurality of base stations using the base station information and the mobile device information. system.
  19.   The resource adjustment means has a plurality of policies for specifying a mobile device and a base station to be handed over, and the policy is included in a plurality of pieces of information included in each of the base station information and the mobile device information. The communication system according to claim 18, wherein the mobile device and the base station to be handed over are specified using corresponding information.
  20.   20. The communication system according to claim 18, wherein the resource adjustment unit periodically specifies the mobile device and base station to be handed over.
  21.   The communication according to any one of Claims 18 to 20, wherein the resource adjustment unit specifies the mobile device and base station to be handed over in response to a request from the mobile device information management unit. system.
  22.   The communication according to any one of claims 18 to 21, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over in response to a request from the base station information management unit. system.
  23. The mobile device information includes information indicating the type of application for each mobile device,
    The communication system according to any one of claims 18 to 22, wherein the resource adjustment unit specifies a mobile device and a base station to be handed over based on information indicating a type of the application.
  24. The mobile device information further includes information indicating a QoS value included in a packet for each mobile device,
    The communication system according to any one of claims 18 to 23, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the QoS value.
  25. The mobile device information further includes information indicating a traffic situation for each mobile device,
    The communication system according to any one of claims 18 to 24, wherein the resource adjustment unit specifies the mobile device and the base station to be handed over based on information indicating the traffic situation.
  26. The mobile device information further includes information indicating the movement status of each mobile device,
    The communication system according to any one of claims 18 to 25, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the movement status.
  27. The mobile device information further includes information indicating the priority order of the mobile device for handover,
    27. The communication system according to any one of claims 18 to 26, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the priority order.
  28. The mobile device information further includes information indicating charging and service contents for each mobile device,
    The communication according to any one of claims 18 to 27, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating contents of the charging and service. system.
  29. The mobile device information further includes information indicating a distance from the mobile device to the base station,
    The communication according to any one of claims 18 to 28, wherein the resource adjustment unit specifies the mobile device and the base station to be handed over based on information indicating a distance to the base station. system.
  30. The mobile device information further includes information indicating received power for each mobile device,
    30. The communication system according to any one of claims 18 to 29, wherein the resource adjustment unit specifies a mobile device and a base station to be handed over based on information indicating the received power.
  31. The mobile device information further includes information indicating a wireless interface for each mobile device,
    The communication system according to any one of claims 18 to 30, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the radio interface.
  32. The base station information further includes information indicating a communication status for each base station,
    The communication system according to any one of claims 18 to 31, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the communication status.
  33. The base station information further includes information indicating a communication method for each base station,
    The communication system according to any one of claims 18 to 32, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the communication method.
  34. The base station information further includes information indicating a position and a communication range for each base station,
    The communication system according to any one of claims 18 to 33, wherein the resource adjustment unit specifies a mobile station and a base station to be handed over based on information indicating the location and a communication range. .
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