JP2011087041A - Mobile terminal device, base station device, and radio communication system - Google Patents

Abstract

Provided are a mobile terminal device, a base station device, and a wireless communication system capable of communicating with a more appropriate base station device when throughput is reduced due to communication restrictions from the base station device.
When a mobile terminal device 110 determines whether or not a communication restriction is imposed, a communication restriction determination unit 203 that determines whether or not the communication restriction is imposed; The base station apparatus that is in the area based on the index that indicates the throughput in communication with the base station apparatus that is present, and the index that indicates the throughput in communication with the base station apparatus that is the destination when the base station apparatus that is in the transition is transferred And a communication control unit 206 for determining whether or not to shift.
[Selection] Figure 2

Description

  The present invention relates to a mobile terminal device, a base station device, and a radio communication system.

  In recent years, a home cell base station apparatus (femtocell base station apparatus) with a narrow service area has been proposed as a base station apparatus for a wireless communication system in addition to a conventional macrocell base station apparatus having a wide service area. 3GPP, E-UTRA (The 3rd Generation Partnership Project Evolved Universal Terrestrial Radio Access) has also been studied on the operation of home cell base station devices (e.g. Non-patent document 1).

The following three have been proposed for access setting of the home cell base station apparatus. The first is open access, the second is closed access, and the third is hybrid access. Similar to the macro cell base station apparatus, the open access is a setting that can be accessed by any mobile terminal apparatus. Closed access is a setting that allows access only to mobile terminal devices of users belonging to a CSG (Closed Subscriber Group). Hybrid access is a setting that allows access to mobile terminal devices of users not belonging to the CSG in addition to mobile terminal devices of users belonging to the CSG. In the hybrid access, a communication restriction described later may be performed on a mobile terminal device of a user who does not belong to the CSG. Examples of CSG include employees at a company, facility users at a certain facility, and families at home.
In addition, when the mobile terminal device selects one cell station that is located from a plurality of available base station devices (cell selection), the received power of the signal received from each base station device is measured. In general, a method of selecting a base station apparatus that maximizes received power is used (for example, Non-Patent Document 2).

3GPP, TS22.220, V9.1.1, June 2009 3GPP, TS36.304, V8.5.0, March 2009

  As described above, when the access setting of the home cell base station apparatus is hybrid access, both the mobile terminal apparatus of the user belonging to the CSG and the mobile terminal apparatus of the user not belonging to the CSG can access. For this reason, when the home cell base station apparatus allocates radio resources to the mobile terminal apparatuses of users who do not belong to the CSG, there is a possibility that the radio resources to be allocated to the mobile terminal apparatuses of users who belong to the CSG will be insufficient. In order to prevent this shortage of radio resources, a hybrid access home cell base station apparatus (hereinafter also referred to as a hybrid home cell base station apparatus) determines the amount of radio resources allocated to a user's mobile terminal apparatus that does not belong to the CSG as The communication throughput (communication speed) may be reduced for the user. This reduction in communication throughput is called communication restriction.

Here, as described above, when the mobile terminal apparatus performs cell selection for selecting a base station apparatus having a large reception power as a base station apparatus in the area, the reception power from the hybrid home cell base station apparatus should be maximum. For example, the hybrid home cell base station device continues to be present regardless of whether there is a communication restriction.
When there are many mobile terminal devices in the region where the received power from the hybrid home cell base station device is maximum, these mobile terminal devices are all located in the hybrid home cell base station device described above and A mobile terminal device of a user who does not belong is subject to communication restrictions. In this case, even if there is another base station apparatus that can use more radio resources and can obtain higher throughput, the mobile terminal apparatus that is subject to communication restrictions may There has been a problem that the hybrid home cell base station device continues to be located without moving to the device.

  The present invention has been made in view of such circumstances, and an object thereof is a mobile terminal capable of communicating with a more appropriate base station apparatus when throughput is reduced due to communication restrictions from the base station apparatus. An apparatus, a radio base station apparatus, and a radio communication system are provided.

[1] The present invention has been made to solve the above-described problem, and a mobile terminal apparatus according to an aspect of the present invention includes a base station apparatus including a hybrid home cell base station apparatus that performs communication restriction according to a communication situation. A mobile terminal apparatus that is in the area by selecting one of the base station apparatuses from among the receiver, a reception unit that receives a radio signal, and a base station apparatus that is in the area based on the radio signal received by the reception unit A communication restriction determination unit that determines whether or not communication restriction is received from a mobile station, and a serving cell throughput index generation unit that generates a serving cell throughput index that is an index indicating a throughput in communication with the base station apparatus that is located And a destination cell throughput that is an index indicating a throughput in communication with a base station apparatus that can be located when the base station apparatus moves to a base station apparatus other than the base station apparatus that is located. When it is determined that the destination cell throughput index generation unit that generates a put index and the communication restriction determination unit is subjected to communication restriction, based on the serving cell throughput index and the destination cell throughput index, It is characterized by determining whether or not to shift a base station apparatus that is in the area, and a communication control unit that shifts the base station apparatus that is in the area when it is determined to shift.
This mobile terminal apparatus determines whether or not to move the base station apparatus that is in the area based on the in-cell cell throughput index and the destination cell throughput index, so that throughput decreases due to communication restrictions from the base station apparatus In this case, it is possible to communicate with a more appropriate base station apparatus.

[2] A mobile terminal device according to an aspect of the present invention is the mobile terminal device described above, wherein the communication control unit determines that the communication restriction determination unit is subject to communication restriction, and the transition is performed. When the value of the destination cell throughput index is larger than the value of the serving cell throughput index, the cell transition condition that is a condition for transitioning the serving base station apparatus is changed, and based on the changed cell transition condition A determination is made as to whether or not to move the base station apparatus that is in the area, and if it is determined to shift, the base station apparatus that is in the area is transferred.
When the destination cell throughput index is larger than the serving cell throughput index, this mobile terminal apparatus changes the cell transition condition instead of immediately performing the cell transition. If the mobile terminal device is not located within a certain period of time after changing the cell transition condition, the base station device before the transition does not limit communication unless the mobile terminal device is in the area. When the mobile terminal apparatus is in a state where communication restriction is performed when the mobile station is in the service area, it is possible to avoid a situation in which the mobile terminal apparatus repeats cell transition between the base station apparatus before transition and another base station apparatus.

[3] A mobile terminal apparatus according to an aspect of the present invention is the mobile terminal apparatus described above, wherein the communication control unit includes the serving cell throughput index and the destination cell throughput index as arguments. It changes to cell transfer conditions.
If this mobile terminal apparatus determines that it is subject to communication restrictions, it changes to cell transition conditions that include the serving cell throughput index and the destination cell throughput index as arguments. Thus, when the throughput decreases, it is possible to communicate with a more appropriate base station apparatus.

[4] A mobile terminal apparatus according to an aspect of the present invention is the mobile terminal apparatus described above, wherein the serving cell throughput index is the number of resource blocks allocated per frame from the serving base station apparatus. The transfer destination cell throughput index is an estimated value of the number of resource blocks allocated per frame from the transfer destination base station apparatus when the base station apparatus in the area is transferred.
This mobile terminal apparatus uses the number of resource blocks allocated to the mobile terminal apparatus per frame as an index of the throughput of the serving cell and the destination cell. Usually, as the number of allocated resource blocks increases, the throughput improves, so by using these indicators, it is possible to predict whether or not the throughput will improve by moving the serving cell. When throughput is reduced due to communication restrictions, communication with a more appropriate base station apparatus can be performed.

[5] A mobile terminal apparatus according to an aspect of the present invention is the mobile terminal apparatus described above, wherein the serving cell throughput index is a throughput in data reception from a serving base station apparatus, and the transition destination The cell throughput index is an estimated value of throughput in data reception from the destination base station apparatus when the existing base station apparatus is migrated.
This mobile terminal apparatus uses the throughput in data reception as an index of throughput in communication with the serving cell and the destination cell. By using these indicators, it is possible to predict whether or not the throughput will be improved by moving the cell in the same area. It can communicate with the station device.

[6] A mobile terminal apparatus according to an aspect of the present invention is the above-described mobile terminal apparatus, wherein the communication restriction determination unit performs communication restriction included in broadcast information from the base station apparatus in the area. It is characterized in that it is determined whether or not the communication restriction is imposed on the basis of information indicating whether or not the communication is performed.
This mobile terminal apparatus determines whether or not communication restriction is imposed based on information indicating whether or not communication restriction is included, which is included in the broadcast information from the base station apparatus that is in the area. As a result, similarly to the above, when the throughput is reduced due to communication restriction, it is possible to communicate with a more appropriate base station apparatus.

[7] A mobile terminal apparatus according to an aspect of the present invention is the above-described mobile terminal apparatus, wherein the communication restriction determination unit is included in a signal transmitted individually to the mobile terminal apparatus from the located base station apparatus. It is characterized in that it is determined whether or not the communication restriction is imposed based on the information indicating whether or not the communication restriction is performed.
This mobile terminal apparatus determines whether or not it is subject to communication restriction based on information indicating whether or not communication restriction is included, included in a signal transmitted to each mobile terminal apparatus from a base station apparatus that is in the area. to decide. As a result, similarly to the above, when the throughput is reduced due to communication restriction, it is possible to communicate with a more appropriate base station apparatus.

[8] A mobile terminal apparatus according to an aspect of the present invention is the mobile terminal apparatus described above, wherein the receiving unit calculates received power of a signal from the base station apparatus that is in the area, and determines the communication restriction The unit determines whether or not the communication restriction is performed based on the value of the serving cell throughput index and the received power.
Since this mobile terminal apparatus determines whether or not communication restriction is imposed based on the received power of the signal from the base station apparatus that is in the area and the value of the cell throughput index that is in the area, the mobile terminal apparatus can communicate with the base station apparatus. It is possible to determine whether or not the communication is restricted without receiving a signal indicating that the restriction is performed.

[9] Moreover, the mobile terminal apparatus according to an aspect of the present invention is the above-described mobile terminal apparatus, and the migration destination cell throughput index generation unit is included in a signal received from any communicable base station apparatus. The transfer destination cell throughput index is generated based on data indicating a relationship between received power in the mobile terminal apparatus and throughput when the mobile terminal apparatus receives data from the base station apparatus.
Since this mobile terminal apparatus generates a destination cell throughput index based on data indicating the relationship between the received power in the mobile terminal apparatus and the throughput when the mobile terminal apparatus receives data from the base station apparatus, Similarly to the above, when the throughput is reduced due to the communication restriction, it is possible to communicate with a more appropriate base station apparatus using the migration destination cell throughput index.

[10] In addition, the base station apparatus according to an aspect of the present invention performs communication restriction based on a communication control unit that determines allocation of radio resources to mobile terminal devices and a radio resource amount allocated by the communication control unit. A communication restriction setting unit that determines whether or not, and a transmission unit that transmits a signal indicating that communication restriction is performed when the communication restriction setting unit sets communication restriction, the communication control unit When the communication restriction setting unit decides to restrict communication, the communication restriction setting unit decides that the wireless resource amount to be allocated to the mobile terminal device that does not satisfy a predetermined condition is not subject to communication restriction. It is characterized by being reduced more than the case.
Since this base station device transmits a signal indicating that communication is restricted when communication restriction is set, the mobile terminal device that has received this signal determines whether or not communication restriction has been imposed. be able to.

[11] A base station apparatus according to an aspect of the present invention includes a communication control unit that outputs received power in the mobile terminal apparatus and a radio resource amount allocated to the mobile terminal apparatus, received from the mobile terminal apparatus. Based on the received power and the radio resource amount output from the communication control unit, data indicating the relationship between the received power in the mobile terminal apparatus and the throughput when the mobile terminal apparatus receives data from the base station apparatus The relationship between the assumed radio resource table generating unit for generating the received power and the reception power generated by the assumed radio resource table generating unit and the throughput when the mobile terminal device receives data from the base station device is shown. And a transmission unit for transmitting data.
Since this base station device transmits data indicating the relationship between the received power in the mobile terminal device and the throughput when the mobile terminal device receives data from the base station device, the mobile terminal device that has received this data Based on this data, it is possible to estimate the throughput of the received data when the base station apparatus in the area is moved.

[12] In the wireless communication system according to an aspect of the present invention, at least one of the mobile terminal devices is located based on a reception unit that receives a wireless signal and a wireless signal received by the reception unit. A serving cell throughput that generates a serving cell throughput index that is an index indicating a throughput in communication with the serving base station device and a communication restriction determining unit that determines whether or not the communication is restricted from the base station device Transition destination cell throughput index, which is an index indicating throughput in communication with the base station apparatus capable of being located when the index generation unit and the base station apparatus other than the base station apparatus that is located are migrated The destination cell throughput index generation unit and the communication restriction determination unit determine that the communication restriction determination unit is subject to communication restriction. Based on the destination cell throughput index, it is determined whether or not to shift the base station apparatus that is in the area, and if it is determined to shift, the communication control unit that shifts the base station apparatus that is in the area, At least one of the base station devices includes a communication control unit that determines allocation of radio resources to the mobile terminal device, and communication that determines whether to perform communication restriction based on the radio resource amount allocated by the communication control unit. A limit setting unit, and when the communication control unit determines that the communication limit setting unit performs communication limitation, a radio resource amount to be allocated to a mobile terminal device that does not satisfy a predetermined condition, This is characterized in that the communication restriction setting unit is reduced compared to a case where it is determined not to perform communication restriction.
In this wireless communication system, the mobile terminal apparatus determines whether or not communication restriction is imposed from the base station apparatus. If it is determined that the communication restriction is imposed, the mobile terminal apparatus determines whether or not to change the base station apparatus that is in the area based on the in-zone cell throughput index and the destination cell throughput index. Thereby, when the throughput is reduced due to communication restriction from the base station apparatus, it is possible to communicate with a more appropriate base station apparatus.

  According to the present invention, a mobile terminal apparatus can communicate with a more appropriate base station apparatus when throughput is reduced due to communication restrictions from the base station apparatus.

1 is a system configuration diagram illustrating a schematic configuration of a wireless communication system 100 according to a first embodiment of the present invention. It is a block diagram which shows schematic structure of the mobile terminal device 110 in the embodiment. It is a data block diagram which shows the data structure of the conversion table which the conversion table memory | storage part 210 memorize | stores in the embodiment. It is a flowchart which shows the process sequence which determines whether the mobile terminal apparatus 110 transfers a cell in the same embodiment. 2 is a configuration diagram illustrating a schematic configuration of a hybrid home cell base station apparatus 120 in the embodiment. FIG. It is a block diagram which shows schematic structure of the mobile terminal device 112 in the 2nd Embodiment of this invention. It is a figure which shows the data structure of the table of the serving cell throughput parameter | index and reception power which the reception condition memory | storage part 312 memorize | stores in the embodiment. It is a system block diagram which shows schematic structure of the radio | wireless communications system 102 in the 3rd Embodiment of this invention. It is a block diagram which shows schematic structure of the hybrid home cell base station apparatus 125 in the embodiment. It is a data block diagram which shows the data structure of the radio | wireless resource log | history table which the radio | wireless resource log | history memory | storage part 823 memorize | stores in the embodiment. It is a data block diagram which shows the data structure of the assumption radio | wireless resource table which the assumption radio | wireless resource table memory | storage part 822 memorize | stores in the embodiment. It is a block diagram which shows schematic structure of the mobile terminal device 113 in the embodiment.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a system configuration diagram showing a schematic configuration of a wireless communication system 100 according to the first embodiment of the present invention. In the figure, a radio communication system 100 includes mobile terminal apparatuses 110 and 111, a hybrid home cell base station apparatus 120, a home cell base station apparatus 121, and a macro cell base station apparatus 122.
The mobile terminal devices 110 and 111 are mobile terminal devices such as mobile telephone terminal devices. The hybrid home cell base station apparatus 120, the home cell base station apparatus 121, and the macro cell base station apparatus 122 are base station apparatuses that establish wireless communication lines with the mobile terminal apparatuses 110 and 111 and perform wireless communication.

  Hybrid home cell base station apparatus 120 and home cell base station apparatus 121 have a narrower range of providing services than macro cell base station apparatus 122. In the figure, lines C1 to C3 surrounding each base station apparatus indicate a range in which radio waves of the base station apparatus reach, that is, a range (cell) in which services are provided. The range in which the hybrid home cell base station apparatus 120 provides a service is indicated by a cell C1, the range in which the home cell base station apparatus 121 provides a service is indicated by a cell C2, and the range in which the macro cell base station apparatus 122 provides a service is indicated by a cell. Indicated by C3. The mobile terminal device included in the range where the radio wave reaches can receive the radio wave of the base station device. For example, in FIG. 1, mobile terminal apparatus 110 can receive radio waves from macro cell base station apparatus 122, hybrid home cell base station apparatus 120, and home cell base station apparatus 121. The mobile terminal apparatus 110 is a user's mobile terminal apparatus that does not belong to the CSG of the hybrid home cell base station apparatus 120. In addition, the mobile terminal apparatus 110 belongs to the CSG of the home cell base station apparatus 121 and can access the home cell base station apparatus 121. On the other hand, the mobile terminal apparatus 111 can receive radio waves from the macro cell base station apparatus 122 and the hybrid home cell base station apparatus 120. The mobile terminal apparatus 111 is a user's mobile terminal apparatus belonging to the CSG of the hybrid home cell base station apparatus 120.

FIG. 2 is a configuration diagram illustrating a schematic configuration of the mobile terminal apparatus 110. In the figure, a mobile terminal apparatus 110 includes an antenna unit 201, a reception unit 202, a communication restriction determination unit 203, a serving cell throughput index generation unit 204, a destination cell throughput index generation unit 205, a communication control unit 206, and an application unit 207. A transmission unit 208, a CSG list storage unit 209, a conversion table storage unit 210, and a cell transition condition storage unit 211.
The antenna unit 201 transmits a radio signal output from the transmission unit 208 to the base station apparatus, receives a radio signal from the base station apparatus, and outputs the received signal to the reception unit 202. The receiving unit 202 receives a signal from the base station apparatus via the antenna unit 201, reads out received data from the received signal, generates a communication restriction determination unit 203, a serving cell throughput index generation unit 204, and a destination cell throughput index generation. Output to the unit 205, the communication control unit 206, and the application unit 207. In addition, the reception unit 202 calculates a reception power value (hereinafter simply referred to as “reception power”) of a signal received from each base station apparatus, and sends it to the destination cell throughput index generation unit 205 and the communication control unit 206. Output.

  The communication restriction determination unit 203 determines whether or not the communication restriction is received from the base station apparatus currently located based on the data output from the reception unit 202. The in-zone cell throughput index generation unit 204 generates a in-zone cell throughput index, which is an index indicating the throughput in communication with the base station apparatus currently in the area, based on the data output from the reception unit 202. The serving cell throughput index will be described later. The transfer destination cell throughput index generation unit 205 is an index indicating the throughput in communication with the transfer destination base station apparatus when the base station apparatus that performs communication is transferred based on the data output from the reception unit 202 and the received power. A destination cell throughput index is generated. The migration destination cell throughput index will be described later.

The communication control unit 206 controls each unit. In addition, the communication control unit 206 performs transition of a base station apparatus that performs communication. Details will be described later. The application unit 207 performs processing such as display of a document file, creation of mail, display of received mail, and the like, and outputs transmission data such as transmission mail to the transmission unit 208. The transmission unit 208 transmits the data output from the application unit 207 to the base station apparatus in the area via the antenna unit 201.
The CSG list storage unit 209 stores a list of CSG identifiers (IDs) to which the user of the mobile terminal device 110 belongs. The CSG identifier is an identifier for identifying the CSG of the base station apparatus. The conversion table storage unit 210 stores the migration destination cell throughput index in association with the received power. The cell transition condition storage unit 211 stores a condition for transitioning a base station apparatus that performs communication.
The mobile terminal device 110 is configured to include portions other than the above, such as an operation input unit that receives user operations, but the description and illustration thereof are omitted. Note that the configuration of the mobile terminal apparatus 111 is the same as that of the mobile terminal apparatus 110, and illustration and description thereof are omitted.

Next, the operation of the mobile terminal device 110 will be described.
The mobile terminal apparatus 110 determines whether or not communication restriction is imposed based on the broadcast information received from the hybrid home cell base station apparatus 120 that is in the service area.
Specifically, first, communication restriction information indicating whether or not the hybrid home cell base station apparatus 120 performs communication restriction on a mobile terminal apparatus of a user other than a CSG member, and an identifier of the CSG of the base station apparatus Are included in the broadcast information and transmitted. Next, the receiving unit 202 of the mobile terminal apparatus 110 reads out the communication restriction information and the CSG identifier from the broadcast information received from the hybrid home cell base station apparatus 120, and reads out the read communication restriction information and the CSG identifier. The data is output to the communication restriction determination unit 203.

When the communication restriction information and the CSG identifier are output from the reception unit 202, the communication restriction determination unit 203, based on the communication restriction information output from the reception unit 202, It is determined whether or not the hybrid home cell base station device 120) restricts communication with the mobile terminal device of a user other than the CSG member. When it is determined that communication restriction is performed, the communication restriction determination unit 203 determines whether the CSG identifier output from the reception unit 202 is stored in the CSG list storage unit 209. The communication restriction determination unit 203 restricts communication between the mobile home device of the user other than the CSG member and the CSG identifier stored in the CSG list storage unit 209. If it is determined that it is not stored, it is determined that the communication is restricted by the hybrid home cell base station apparatus 120 in the area, and otherwise, it is determined that the communication is not restricted. Based on the determination result, the communication restriction determination unit 203 generates information indicating whether communication restriction is imposed.
The communication restriction determination unit 203 outputs information indicating whether or not the generated communication restriction is received to the serving cell throughput index generation unit 204 and the migration destination cell throughput index generation unit 205.

The serving cell throughput index generation unit 204 indicates that the information output from the communication restriction determination unit 203 indicating whether or not the communication restriction is received indicates that the communication restriction is applied. A serving cell throughput index that is an index indicating the throughput in communication with the base station apparatus (here, hybrid home cell base station apparatus 120) is generated. Specifically, for example, the serving cell throughput index generation unit 204 calculates the number of resource blocks allocated to the mobile terminal device 110 per downlink radio frame as the base station currently located. Read from the control signal transmitted from the apparatus, and the number of read resource blocks is used as a serving cell throughput index. Here, the resource block is a unit of radio resources that the base station apparatus allocates to each mobile terminal apparatus. For example, in OFDM (Orthogonal Frequency Division Multiplexing), a resource block is configured by collecting a predetermined number of resource elements obtained by dividing a frame for each OFDM symbol and for each subcarrier. Each resource block is allocated to any mobile terminal device. As the number of resource blocks allocated to the mobile terminal apparatus increases, it is expected that the throughput of the mobile terminal apparatus in communication with the base station apparatus increases. Therefore, the mobile terminal apparatus 110 does not have the number of resource blocks as described above. It is used as a service cell throughput index.
However, the serving cell throughput index is not limited to the number of resource blocks, and may be another value indicating the throughput in communication with the currently located base station apparatus. For example, the serving cell throughput index generation unit 204 may calculate the throughput in data reception from the currently stationed base station apparatus and use the calculated throughput as the serving cell throughput index.
The serving cell throughput index generation unit 204 outputs the generated serving cell throughput index to the communication control unit 206.

  Further, the migration destination cell throughput index generation unit 205 outputs the cell migration destination when the information output from the communication restriction determination unit 203 indicating whether or not the communication restriction is imposed indicates that the communication restriction is imposed. A destination cell throughput index that is an index indicating the throughput in communication with the candidate home cell base station apparatus 121 or macro cell base station apparatus 122 is generated. The migration destination cell throughput index generation unit 205 reads the migration destination cell throughput index from the conversion table stored in the conversion table storage unit 210 as follows to generate the migration destination cell throughput index.

  FIG. 3 is a data configuration diagram showing the data configuration of the conversion table stored in the conversion table storage unit 210. In the figure, the conversion table is configured to include received power and a destination cell throughput index for each cell type. The conversion table storage unit 210 is an estimated value of the number of resource blocks allocated to the own mobile terminal device 110 per radio frame received from the base station device to which the base station device is moved when the base station device in the base station is moved. A certain destination cell throughput index is stored in advance for each received power and each cell type. In the case where the serving cell throughput index generation unit 204 calculates the throughput in data reception from the serving base station apparatus as the serving cell throughput index, the conversion table storage unit 210 also selects the migration destination candidate base station apparatus. The conversion table storage unit 210 stores data that can be compared with the serving cell throughput index as a destination cell throughput index, such as storing the throughput in data reception from the destination cell throughput index. A unit that can be compared with the serving cell throughput index is also used as the unit of the received power and the destination cell throughput index. In FIG. 3, decibel millimeter (dBm) is used as a unit of received power, and “piece” is used as a unit of a migration destination cell throughput index (here, the number of resource blocks).

The difference in cell type indicates the difference in the total number of resource blocks that the base station apparatus can transmit per frame. This difference in the total number of resource blocks that can be transmitted per frame is caused by, for example, a difference in the scale of base station apparatuses. In addition, each base station apparatus is set to allocate more resource blocks to a mobile terminal apparatus having a large reception power when each mobile terminal apparatus in the area requires the maximum communication speed. Yes. For this reason, the conversion table stored in the conversion table storage unit 210 has a larger value for the migration destination cell throughput index as the received power increases.
For example, when the received power is −105 decibel millimeters, the conversion table in FIG. 10 indicates an expected value that 16 resource blocks are allocated per radio frame when the radio base station apparatus of cell type 2 is shifted. .
The resource block allocation method and the conversion table described above are examples, and the present invention is not limited to this. When the resource block allocation method of the base station apparatus is different from the above, the base station apparatus may store a conversion table corresponding to the allocation method. For example, when the base station apparatus assigns different resource block numbers for each mobile terminal apparatus model, and assigns the same resource block number to the same model regardless of received power, the resource block to be assigned to the mobile terminal apparatus model The number is stored in association with each other. Thereby, the mobile terminal apparatus can read the migration destination cell throughput index according to the resource block allocation method of the base station apparatus from the conversion table.

Returning to FIG. 2, the reception unit 202 reads the cell type from the broadcast information of the cell transition destination candidate base station apparatus, and also receives the received power from the cell transition destination candidate base station apparatus periodically, for example, every 5 minutes. Is detected. The migration destination cell throughput index generation unit 205 reads the migration destination cell throughput index from the conversion table based on the cell type output from the reception unit 202 and the received power.
Note that the conversion table storage unit 210 may store the conversion table as a separate table for each cell type. When the serving cell throughput index generation unit 204 generates the serving cell throughput index, the conversion table may be updated by writing the generated serving cell throughput index in the corresponding column of the conversion table. .
The transfer destination cell throughput index generation unit 205 outputs the generated transfer destination cell throughput index to the communication control unit 206. When the transfer destination cell throughput index is generated for a plurality of base station apparatuses, the transfer destination cell throughput index generation unit 205 outputs all the generated transfer destination cell throughput indexes to the communication control unit 206.

The communication control unit 206 changes the cell transition condition based on the serving cell throughput index output from the serving cell throughput index generation unit 204 and the destination cell throughput index output from the destination cell throughput index generation unit 205. Decide whether or not to do. Specifically, when the communication control unit 206 is subject to communication restrictions and determines that the throughput when the base station apparatus to be communicated is shifted is larger than the throughput of the base station apparatus currently in the area, Change the cell migration condition. At that time, the communication control unit 206, when the migration destination cell throughput index is larger than the serving cell throughput index, the throughput when the communicating base station apparatus is migrated is larger than the throughput in the currently serving base station apparatus. Judge that it is big.
In addition, when there are a plurality of cell transfer destination candidate base station apparatuses, if there is at least one transfer destination cell throughput index larger than the serving cell throughput index, the communication control unit 206 has transferred the base station apparatus to communicate with In this case, it is determined that the throughput in this case is larger than the throughput in the base station apparatus currently located.

FIG. 4 is a flowchart showing a processing procedure for determining whether or not the mobile terminal apparatus 110 moves between cells. When activated, the mobile terminal device 110 starts processing for determining whether or not to move a cell.
In step S601, the communication restriction determination unit 203 determines whether or not communication restriction has been received from a base station apparatus that is present (for example, the hybrid home cell base station apparatus 120). If it is determined that the communication is restricted (step S601: YES), the process proceeds to step S602. If it is determined that it is not received (step S601: NO), the process proceeds to step S605.
In step S602, the serving cell throughput index generation unit 204 generates a serving cell throughput index, and the migration destination cell throughput index generation unit 205 reads the migration destination cell throughput index from the conversion table storage unit 210. In step S603, the communication control unit 206 determines whether or not the throughput in the migration destination candidate cell is larger than the throughput in the cell where the cell is located. If it is determined that the throughput in the cell in the area is larger (step S603: NO), the process proceeds to step S605. If it is determined that the throughput in the migration destination candidate cell is larger (step S603: YES), the step is performed. The process proceeds to S604.

In step S604, the communication control unit 206 changes the cell transition condition used when determining whether or not to perform cell transition. Here, the cell transition condition storage unit 211 uses the cell migration condition that does not include the serving cell throughput index and the transition destination cell throughput index as arguments as the transition destination candidate rather than the received power + hysteresis of the serving cell. The cell transition condition that the cell is shifted when the received power-offset of the cell is larger is stored. In addition, the cell transition condition storage unit 211 uses, as a cell transition condition including the serving cell throughput index and the transition destination cell throughput index as arguments, the received power of the serving cell + hysteresis + the serving cell throughput index. Also stored is a condition that the cell is transferred when the received power of the transfer destination candidate cell−offset + transfer destination cell throughput index is larger. Before the communication control unit 206 changes the cell transition condition, the cell is migrated when the received power-offset of the destination candidate cell is larger than the received power + hysteresis of the cell being located. Transition conditions are selected. The communication control unit 206 determines a cell when the received power of the destination candidate cell minus the offset + the destination cell throughput index is larger than the received power of the cell being located + hysteresis + the serving cell throughput index. By selecting the condition of transition, the cell transition condition used when determining whether or not to shift the cell is changed. Here, hysteresis and offset are positive constants.
Note that which of the received power and the throughput index is to be emphasized can be adjusted by multiplying these by a coefficient. For example, the communication control unit 206 may shift the cell when the shift destination cell throughput index−offset is larger than the in-zone cell throughput index + hysteresis without considering the received power.

In step S605, the communication control unit 206 determines whether to move a cell using the cell transition condition selected in step S604. When it is determined that the cell is to be transferred (step S605: YES), the process proceeds to step S606, and when it is determined that the cell is not to be transferred (step S605: NO), the process returns to step S601.
In step S606, the communication control unit 206 moves to a cell that performs communication. Thereafter, the process returns to step S601.

In step S604, the communication control unit 206 changes the cell transition condition in the cell transition condition storage unit 211 after a predetermined time has elapsed since the communication control unit 206 changed the cell transition condition in the cell transition condition storage unit 211. When the received power-offset of the transfer destination candidate cell is larger than the received power + hysteresis of the cell in the service area, the cell transfer condition is returned to the cell transfer condition. For example, when 10 minutes have elapsed since the change of the cell transition condition, the communication control unit 206 has a larger received power−offset of the transition destination candidate cell than the received power + hysteresis of the cell in the area. Return to the cell transfer condition of transferring the cell.
As described above, in step S603, when the destination cell throughput index is larger than the serving cell throughput index, the cell transition condition is changed instead of immediately performing the cell transition, and the cell transition condition is changed. The hybrid home cell base station apparatus 120 does not limit communication unless the mobile terminal apparatus 110 is in the service area by not returning the cell transition condition for a certain period of time, but communication is performed when the mobile terminal apparatus 110 is in the service area. In a state where the restriction is performed, it is possible to avoid a situation in which the mobile terminal device 110 repeats cell transition between the hybrid home cell base station device 120 and another base station device.
Note that the condition for the communication control unit 206 to return the cell transition condition is not limited to the above. For example, a communication restriction determination is made as to whether or not there is a base station apparatus in which the mobile terminal apparatus 110 is capable of receiving radio waves and communication restriction is performed and the user of the mobile terminal apparatus 110 is not a CSG member. The communication control unit 206 may return the cell transition condition when the unit 203 determines that there is no corresponding base station apparatus and after a certain time has elapsed since the cell transition condition was changed. As a result, when the cell transition condition is returned, it is possible to avoid a situation in which the cell transition condition is changed and the cell transition is performed again because the destination base station apparatus is in communication restriction.

Next, the hybrid home cell base station apparatus 120 will be described.
FIG. 5 is a configuration diagram illustrating a schematic configuration of the hybrid home cell base station apparatus 120. In the figure, a hybrid home cell base station apparatus 120 includes an antenna unit 701, a receiving unit 702, a communication control unit 703, a wired communication unit 704, a mobile station allocation resource determination unit 705, a communication restriction setting unit 706, and a broadcast information generation unit 707. And a transmission unit 709.
The antenna unit 701 transmits the radio signal output from the transmission unit 709 toward the mobile terminal device, receives the radio signal from the mobile terminal device, and outputs the signal to the reception unit 702. The receiving unit 702 receives a signal from the mobile terminal device via the antenna unit 701, reads communication data from the received signal, and outputs the communication data to the communication control unit 703. In addition, the reception unit 702 calculates the received power of the signal received from each mobile terminal apparatus and outputs it to the communication control unit 703.
The communication control unit 703 outputs communication data from the mobile terminal device output from the receiving unit 702 to the wired communication unit 704. In addition, the communication control unit 703 allocates communication data output from the wired communication unit 704 to the mobile terminal device located in the own cell to the resource block, and outputs the resource block to the transmission unit 709. The hybrid home cell base station apparatus 120 receives information on the received power in the mobile terminal apparatus from each mobile terminal apparatus, and the communication control unit 703 allocates more resource blocks to the mobile terminal apparatus with a large received power. Further, the communication control unit 703 outputs the radio resource usage status to the mobile station allocated resource determination unit 705 when communication data is allocated to resource blocks.

A wired communication unit 704 is connected to the Internet or the like to communicate with a wired line, and transmits communication data output from the communication control unit 703 from the mobile terminal device to the wired line. Also, when the wired communication unit 704 receives communication data from the wired line to the mobile terminal device located in its own cell, the wired communication unit 704 outputs the received communication data to the communication control unit 703.
The mobile station allocated resource determination unit 705 calculates the ratio of the number of allocated resource blocks to the total number of resource blocks based on the usage status of radio resources output from the communication control unit 703. The communication restriction setting unit 706 sets a communication restriction when the ratio calculated by the mobile station allocation resource determination unit 705 is larger than a preset threshold value, and notifies the communication control unit 703 of a signal indicating that the communication is being restricted. The information is output to the information generation unit 707.
The communication control unit 703, to which a signal indicating that communication is being restricted, is preferentially allocated to user mobile terminal devices belonging to the CSG, thereby assigning resource blocks to the user mobile terminal devices not belonging to the CSG. Restrict communication.

Also, the broadcast information generation unit 707 that has received a signal indicating that communication is being restricted, communication restriction information indicating that communication restriction is being performed, and the identifier of the CSG of the hybrid home cell base station device 120, Is generated. On the other hand, when a signal indicating that communication is being restricted is not input, the broadcast information generation unit 707 includes communication restriction information indicating that communication restriction is not being performed, and the CSG of the hybrid home cell base station apparatus 120. Broadcast information including the identifier is generated. The notification information generation unit 707 outputs the generated notification information to the transmission unit 709. The transmission unit 709 transmits the communication data assigned to the resource block output from the communication control unit 703 and the notification information output from the notification information generation unit 707 via the antenna unit 701 to a mobile terminal such as the mobile terminal device 110. Send to device.
Thereby, as described above, the mobile terminal apparatus 110 reads out the communication restriction information and the CSG identifier from the broadcast information received from the hybrid home cell base station apparatus 120, and performs communication restriction from the hybrid home cell base station apparatus 120. It is possible to determine whether or not

As described above, when the mobile terminal apparatus 110 is restricted in communication, it determines whether to move the cell based not only on the received power but also on the index indicating the throughput. Even when the received power of the signal from the cell base station apparatus 120 is larger than the received power of the signal of the other base station apparatus, it is possible to shift to a cell having a higher throughput. Thereby, the mobile terminal apparatus 110 can perform good communication with an increased throughput in communication with the base station apparatus. Thus, the mobile terminal apparatus 110 can communicate with a more appropriate base station apparatus when the throughput is reduced due to communication restrictions from the home cell base station apparatus.
Further, by changing the cell transition condition only when communication restriction is performed, the mobile terminal apparatus 110 is located in the base station apparatus having the maximum received power when communication restriction is not performed. Accordingly, it can be expected that the mobile terminal apparatus 110 can reduce power consumption by performing transmission / reception with smaller power.
Moreover, the hybrid home cell base station apparatus performs communication restriction when radio resources (specifically, resource blocks) are insufficient. By increasing the number of mobile terminal devices that shift from the hybrid home cell base station device that performs communication restriction to other cells, the radio resources of the hybrid home cell base station device are released, and the hybrid home cell base station device The control load can be reduced.

  Note that the hybrid home cell base station apparatus 120 does not include communication restriction information indicating whether or not communication restriction is performed in the broadcast information, but to mobile terminal apparatuses of users other than CSG members who are in the area. May be transmitted individually. In this case, hybrid home cell base station apparatus 120 includes an individual communication information generation unit (not shown), and also includes a CSG member storage unit (not shown). When a signal indicating that communication is being restricted is output from the communication restriction setting unit 706, the individual communication information generation unit is configured to respond to a mobile terminal device of a user other than a CSG member among the mobile terminal devices located in the area. The communication restriction information indicating that communication restriction is performed individually is transmitted via the transmission unit 709 and the antenna unit 701. When the mobile terminal apparatus 110 receives the communication restriction information, the reception unit 202 outputs the communication restriction information to the communication restriction determination unit 203. Accordingly, as in the above-described case where the hybrid home cell base station apparatus 120 transmits the communication restriction information included in the broadcast information, whether or not the mobile terminal apparatus 110 receives communication restrictions from the hybrid home cell base station apparatus 120. Can be determined.

<Second Embodiment>
FIG. 6 is a configuration diagram illustrating a schematic configuration of the mobile terminal device 112 according to the second embodiment of the present invention. As in the case of the mobile terminal apparatus 110 in FIG. 1, the hybrid home cell base station apparatus 120, the home cell base station apparatus 121, and the macro cell base station apparatus 122 establish a wireless communication line with the mobile terminal apparatus 112. Perform wireless communication. Moreover, the mobile terminal apparatus 112 is a user's mobile terminal apparatus which does not belong to CSG of the home cell base station apparatus 120 similarly to the mobile terminal apparatus 110 of FIG. Moreover, the mobile terminal apparatus 112 can be located in the home cell base station apparatus 121 similarly to the mobile terminal apparatus 110 of FIG.
In FIG. 6, the mobile terminal device 112 includes an antenna unit 201, a reception unit 202, a communication restriction determination unit 303, a serving cell throughput index generation unit 204, a migration destination cell throughput index generation unit 205, a communication control unit 206, and an application unit 207. A transmission unit 208, a conversion table storage unit 210, a cell transition condition storage unit 211, and a reception status storage unit 312.
In the figure, the same reference numerals (201, 202, 204, 205, 206, 207, 208, 210, 211) are assigned to portions corresponding to the respective portions in FIG.
The reception status storage unit 312 sets the serving cell throughput index generated by the serving cell throughput index generating unit 204 and the received power calculated by the receiving unit 202 as a quantity representing the radio wave environment as a set at the same time. And stored at a predetermined time interval.
The communication restriction determination unit 303 reads out the serving cell throughput index and the received power at each time from the reception status storage unit 312, and divides the read out total serving cell throughput index by the total received power read out The current cell throughput index output from the serving cell throughput index generating unit 204 is compared with the value obtained by dividing the current cell throughput index output from the receiving unit 202 by the current received power. The communication restriction determination unit 303 determines in advance the value obtained by dividing the current serving cell throughput index by the current received power, than the value obtained by dividing the total of the read serving cell throughput index by the total received power. If it is smaller than the threshold value, it is determined that the communication is restricted.
As described above, when each mobile terminal device located in the area requires the maximum communication speed, each base station device is set to allocate more resource blocks to the mobile terminal device with high reception power. ing. Specifically, each base station apparatus allocates a number of resource blocks in proportion to the received power to mobile terminal apparatuses in the service area.
Therefore, the mobile terminal apparatus 112 determines whether or not the number of allocated resource blocks has decreased for reasons other than a decrease in received power by calculating a value obtained by dividing the serving cell throughput index by the received power. If the mobile terminal apparatus 112 determines that the number of allocated resource blocks has decreased for reasons other than a decrease in received power, the mobile terminal apparatus 112 determines that communication restrictions have been imposed.
In addition, when a base station apparatus performs allocation different from the above, a mobile terminal apparatus calculates with the calculation method according to the allocation. For example, when the base station apparatus allocates resource blocks regardless of the received power, the number of resource blocks that are not divided by the received power is calculated.

FIG. 7 is a diagram illustrating a data configuration of a table of the serving cell throughput index and the reception power stored in the reception status storage unit 312. In the figure, the reception status storage unit 312 stores received power, a serving cell throughput index, and the time. The serving cell throughput index is the number of resource blocks allocated per radio frame, as described above. In addition, as a unit of the received power and the in-zone cell throughput index, a unit in which the received power and the in-zone cell throughput index are proportional when communication restriction is not performed is used. In the example of the figure, the value of the received power is shown as a positive value in which minus 100 decibel millimeters is the reference value 100, for example, minus 90 decibel millimeters is 110, and minus 110 decibel millimeters is 90, “Number” is used as a unit (here, the number of resource blocks).
The operation of the communication restriction determination unit 303 will be described by taking as an example the case where the data stored in the reception status storage unit 312 has the values shown in FIG. The communication restriction determination unit 303 calculates the ratio of the total cell throughput index for the time t0, the time t1, the time t2, the time t3, and the time t4 and the total reception power obtained from the reception unit 202 ( 200 + 300 + 200 + 200 + 200) / (100 + 120 + 90 + 90 + 100) = 2.2. Here, for example, when the serving cell throughput index output by the serving cell throughput index generation unit 204 is 100 and the reception power output by the receiving unit 202 is 150, the communication restriction determination unit 303 determines whether the ratio between the two is equal. To obtain 100/150 = 0.67. The communication restriction determination unit 303 further calculates a ratio of the calculated two values 0.67 / 2.2 = 0.3045. For example, when the threshold value is 0.50, the calculated value is below the threshold value, so the communication restriction determination unit 303 determines that the communication restriction is received from the hybrid home cell base station apparatus 120.
The communication control unit 206 writes the serving cell throughput index output from the serving cell throughput index generation unit 204 and the received power output from the receiving unit 202 in the reception status storage unit 312 together with the time. Further, the communication control unit 206 deletes (resets) all of the throughput and reception power stored in the reception status storage unit when the cell is transferred.

Note that the communication control unit 206 may write the above data in the reception status storage unit 312 at regular intervals, or may write it when some event occurs such as during communication.
The unit of the serving cell throughput index and the received power may be arbitrary as long as it can be compared with the current value. Note that the communication control unit 206 may determine whether or not communication restriction is performed by comparing the history of the in-cell cell throughput index and the current value without considering the radio wave reception environment.

  From the above, the mobile terminal apparatus 112 can determine whether or not the communication restriction is imposed from the hybrid home cell base station apparatus 120. Therefore, the mobile terminal apparatus 112 can determine whether or not to move to a cell similarly to the mobile terminal apparatus 110 of the first embodiment, and can obtain the same effect as in the case of the first embodiment. Furthermore, the mobile terminal apparatus 112 according to the present embodiment can determine whether or not communication restriction is received without receiving information indicating that communication restriction has been received.

<Third Embodiment>
FIG. 8 is a system configuration diagram showing a schematic configuration of the wireless communication system 102 according to the third embodiment of the present invention. In the figure, the radio communication system 102 includes mobile terminal apparatuses 113 and 114, a hybrid home cell base station apparatus 125, a home cell base station apparatus 121, and a macro cell base station apparatus 122. Further, a range in which the hybrid home cell base station apparatus 125 provides a service is indicated by a cell C1 ′, a range in which the home cell base station apparatus 121 provides a service is indicated by a cell C2, and the macro cell base station apparatus 122 provides a service. The range is indicated by cell C3. In the figure, portions corresponding to the respective portions in FIG. 1 are denoted by the same reference numerals (121, 122), and description thereof is omitted.
The hybrid home cell base station apparatus 125 transmits an assumed radio resource table indicating the relationship between the received power in the mobile terminal apparatus and the throughput when the mobile terminal apparatus receives data from the base station apparatus in FIG. Different from the hybrid home cell base station apparatus 120. Details of the hybrid home cell base station apparatus 125 and the assumed radio resource table will be described later.

  The mobile terminal apparatuses 113 and 114 estimate the throughput when the base station apparatus in the area is shifted based on the assumed radio resource table received from the hybrid home cell base station apparatus 125 in that the mobile terminal apparatus of FIG. 110 and 111 are different. The mobile terminal device 113 is a mobile terminal device of a user who does not belong to the CSG of the hybrid home cell base station device 125. Further, the mobile terminal apparatus 113 belongs to the CSG of the home cell base station apparatus 121 and can access the home cell base station apparatus 121. The mobile terminal device 114 is a user's mobile terminal device belonging to the CSG of the hybrid home cell base station device 125. Details of the mobile terminal device 113 will be described later. The configuration of the mobile terminal device 114 is the same as that of the mobile terminal device 113, and illustration and description thereof are omitted.

FIG. 9 is a configuration diagram illustrating a schematic configuration of the hybrid home cell base station apparatus 125 according to the third embodiment of the present invention. In the figure, a hybrid home cell base station apparatus 125 includes an antenna unit 701, a receiving unit 702, a communication control unit 803, a wired communication unit 704, a mobile station allocated resource determination unit 705, a communication restriction setting unit 706, and a broadcast information generation unit 807. A transmission unit 709, an assumed radio resource table generation unit 821, an assumed radio resource table storage unit 822, and a radio resource history storage unit 823.
In the figure, the same reference numerals (701, 702, 704, 705, 706, 709) are assigned to portions corresponding to the respective portions in FIG.
The communication control unit 803 operates in the same manner as the communication control unit 703 in FIG. In addition, the communication control unit 803 reads the received power in the mobile terminal device from the signal received from the mobile terminal device residing in the own hybrid home cell base station device 125 output from the receiving unit 702, and this mobile terminal device And the amount of radio resources allocated to this mobile terminal device, specifically, the number of resource blocks per frame are output to the assumed radio resource table generation unit 821. The communication control unit 803 outputs received power with a granularity of 5 dB, such as −130 dB, −125 dB,.
The assumed radio resource table generation unit 821 updates the radio resource history storage unit 823 and the assumed radio resource table storage unit 822 based on the received power and the number of resource blocks in the mobile terminal apparatus output from the communication control unit 803. .
The radio resource history storage unit 823 stores the received power in each mobile terminal device and the number of resource blocks allocated to the mobile terminal device.
The assumed radio resource table storage unit 822 stores received power in the mobile terminal apparatus and an estimated value of the number of resource blocks that can be used by the mobile terminal apparatus in the case of the received power.
The broadcast information generation unit 807 is different from the broadcast information generation unit 707 in FIG. 5 in that the broadcast information generation unit 807 generates broadcast information that does not include communication restriction information and includes the radio resource table generated by the radio resource table 821.

FIG. 10 is a data configuration diagram illustrating a data configuration of a radio resource history table stored in the radio resource history storage unit 823. In the figure, the radio resource history table includes a mobile terminal device identifier, received power, and radio resource amount (number of resource blocks).
The mobile terminal device identifier is an identifier for identifying the mobile terminal device. For example, an IMSI (International Mobile Subscriber Identity) of the mobile terminal device is used. The received power and the number of resource blocks are values input from the communication control unit 803.
The figure shows, for example, that the last received power from a mobile terminal device with a mobile terminal device identifier “8423236489” and the received power at the mobile terminal device is −110 decibel millimeters, and the resources allocated to the mobile terminal device at that time It indicates that the number of blocks is 12 per frame.
The assumed radio resource table generation unit 821 searches the radio resource history table using the identifier of the mobile terminal apparatus output from the communication control unit 803 as a key, and writes the received power and the number of resource blocks in the corresponding row. If there is no corresponding row, a new row is added and the mobile terminal device identifier, received power, and number of resource blocks are written.

FIG. 11 is a data configuration diagram illustrating a data configuration of an assumed radio resource table stored in the assumed radio resource table storage unit 822. In the figure, the assumed radio resource table includes reception power and an assumed radio resource amount.
The assumed radio resource table in the figure shows that, for example, in a mobile terminal device having a reception power of −110 dB, the estimated value of the amount of available radio resources (number of resource blocks) is 12 per frame. ing.
When the assumed radio resource table generation unit 821 updates the radio resource history table, the assumed radio resource table generation unit 821 reads the number of resource blocks from the same received power row as the updated received power and calculates the average of these resource blocks, that is, the received power Calculates the average of the number of resource blocks allocated to the same mobile terminal apparatus and writes it in the row of the received power in the assumed radio resource table.
When the notification information generation unit 709 generates notification information, the notification information generation unit 709 reads the assumed radio resource table from the assumed radio resource table storage unit 822 and includes it in the notification information. The broadcast information generation unit 709 transmits the generated broadcast information to the mobile terminal device via the transmission unit 709 and the antenna unit 701.

FIG. 12 is a configuration diagram illustrating a schematic configuration of the mobile terminal device 113 in the present embodiment. In the figure, a mobile terminal device 113 includes an antenna unit 201, a reception unit 202, a communication restriction determination unit 303, a serving cell throughput index generation unit 204, a destination cell throughput index generation unit 205, a communication control unit 406, and an application unit 207. A transmission unit 208, a conversion table storage unit 410, a cell transition condition storage unit 211, and a reception status storage unit 312.
In the figure, the same reference numerals (201, 202, 303, 204, 205, 207, 208, 211, 312) are assigned to portions corresponding to the respective portions in FIG.
The communication control unit 406 operates in the same manner as the communication control unit 206 in FIG. In addition, the communication control unit 406 reads the assumed radio resource table from the broadcast information transmitted by the base station apparatus, and writes it in the conversion table storage unit 410 as a conversion table.
The migration destination cell throughput index generation unit 205 uses the conversion table written by the communication control unit 406 to the conversion table storage unit 410, and similarly to the migration destination cell throughput index generation unit 205 in FIG. Generate.
The communication control unit 406 changes the cell transition condition based on the serving cell throughput index output from the serving cell throughput index generation unit 204 and the migration destination cell throughput index output from the migration destination cell throughput index generation unit 205. Decide whether or not to do.

As described above, since the mobile terminal device 113 generates the migration destination cell throughput index using the assumed radio resource table transmitted by the base station device, the mobile station device communicates with a more appropriate base station device. In addition, the operation can be simplified and the power consumption can be reduced.
Similarly to the first embodiment, information indicating that the hybrid home cell base station apparatus 125 performs communication restriction is transmitted, and whether or not the mobile terminal apparatus 113 is subjected to communication restriction based on this information. You may make it judge. Thereby, the same effect as the first embodiment can be obtained.
Note that the base station device that transmits the assumed radio resource table is not limited to the base station device in which the mobile terminal device 113 is located. For example, the mobile terminal device 113 may receive an assumed radio resource table transmitted by the base station device of the migration destination candidate included in the broadcast information, and the assumed radio resource table may be used.

A program for realizing the functions of the mobile terminal apparatuses 110, 112, and 113 and the hybrid home cell base station apparatuses 120 and 125 is recorded on a computer-readable recording medium and recorded on the recording medium. The functions of each unit may be realized by reading the program into a computer system and executing the program. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

  The present invention is suitable for use in mobile terminal apparatuses, base station apparatuses, and radio communication systems.

100 Wireless communication system 110, 111, 112, 113 Mobile terminal device 120, 125 Hybrid home cell base station device 121 Home cell base station device 122 Macro cell base station device 201, 701 Antenna unit 202, 702 Receiving unit 203, 303 Communication restriction determination Unit 204 serving cell throughput index generation unit 205 destination cell throughput index generation unit 206, 406, 703, 803 communication control unit 207 application unit 208, 709 transmission unit 209 CSG list storage unit 210, 410 conversion table storage unit 211 cell migration Condition storage unit 312 Reception status storage unit 704 Wired communication unit 705 Mobile station allocation resource determination unit 706 Communication restriction setting unit 707 Broadcast information generation unit 821 Assumed radio resource table generation unit 822 Assumed radio resource Buru storage unit 823 radio resource history storage unit

Claims (14)

A mobile terminal device that is located in a selected base station device from base station devices including a base station device that performs communication restriction according to a communication situation,
A receiver for receiving a radio signal;
Based on the radio signal received by the reception unit, a communication restriction determination unit that determines whether or not communication restriction is received from a base station device that is in the area,
A serving cell throughput index generating unit that generates a serving cell throughput index that is an index indicating a throughput of communication with the base station apparatus that is in the service area;
Transition destination that generates a destination cell throughput index that is an index indicating the throughput of communication with the base station apparatus that can be located when the base station apparatus other than the base station apparatus that is located is migrated A cell throughput index generation unit;
When it is determined that the communication restriction determination unit is subject to communication restriction, it is determined whether or not to move the base station apparatus in the area based on the area cell throughput index and the destination cell throughput index And, if it is determined to shift, a communication control unit that shifts the base station device in the area,
A mobile terminal device comprising:   The base station apparatus that performs communication restriction according to the communication status is a hybrid home cell base station apparatus that can access users not belonging to the specific subscriber group in addition to users belonging to the specific subscriber group. The mobile terminal apparatus according to claim 1, wherein there is a mobile terminal apparatus.   The mobile terminal apparatus according to claim 1, wherein the mobile terminal apparatus is located in a base station apparatus having a large received power value when communication restriction is not imposed.   The communication control unit determines that the communication restriction determination unit is subject to communication restriction, and if the value of the destination cell throughput index is larger than the value of the cell cell throughput index, Change the cell transition condition, which is a condition for transitioning the base station apparatus to be operated, and determine whether or not to migrate the base station apparatus located in the area based on the changed cell transition condition. The mobile terminal apparatus according to any one of claims 1 to 3, wherein a base station apparatus to which a service is made is transferred.   The mobile terminal apparatus according to claim 4, wherein the communication control unit changes to a cell transition condition including the serving cell throughput index and the destination cell throughput index as arguments. The serving cell throughput index is the number of resource blocks allocated per frame from the serving base station apparatus,
6. The transfer destination cell throughput index is an estimated value of the number of resource blocks allocated per frame from a transfer destination base station apparatus when a base station apparatus in the area is transferred. The mobile terminal device according to any one of the above.   The serving cell throughput index is a throughput in data reception from the serving base station apparatus, and the migration destination cell throughput index is from the destination base station apparatus when the serving base station apparatus is migrated. The mobile terminal apparatus according to claim 1, wherein the mobile terminal apparatus is an estimated value of throughput in data reception.   The communication restriction determination unit determines whether the communication restriction is received based on information included in the broadcast information from the base station apparatus in the area indicating whether the communication restriction is performed. The mobile terminal device according to claim 1, wherein the mobile terminal device is a mobile terminal device.   Whether the communication restriction determination unit is subjected to the communication restriction based on information indicating whether or not communication restriction is included in a signal transmitted individually from the base station apparatus in the area where the mobile terminal apparatus is located. The mobile terminal apparatus according to claim 1, wherein it is determined whether or not. The receiving unit calculates received power of a signal from the base station apparatus in the area;
The communication restriction determination unit determines whether or not the communication restriction is performed based on the value of the serving cell throughput index and the received power.
The mobile terminal device according to claim 1, wherein the mobile terminal device is a mobile terminal device.   The destination cell throughput index generation unit includes a relationship between received power in a mobile terminal device and throughput when the mobile terminal device receives data from the base station device, included in a signal received from any base station device The mobile terminal apparatus according to any one of claims 1 to 10, wherein the migration destination cell throughput index is generated based on data indicating A communication control unit that determines allocation of radio resources to mobile terminal devices;
A communication restriction setting unit for determining whether to perform communication restriction based on a radio resource amount allocated by the communication control unit;
A transmission unit that transmits a signal indicating that communication restriction is performed when the communication restriction setting unit sets communication restriction; and
Comprising
When the communication control unit determines that the communication restriction setting unit performs communication restriction, the communication restriction setting unit performs communication restriction on a radio resource amount to be allocated to a mobile terminal device that does not satisfy a predetermined condition. Less than if you decide not to,
A base station apparatus. A communication control unit that outputs the received power in the mobile terminal device and the radio resource amount allocated to the mobile terminal device, received from the mobile terminal device;
Based on the received power and the radio resource amount output by the communication control unit, data indicating the relationship between the received power in the mobile terminal device and the throughput when the mobile terminal device receives data from the base station device An assumed radio resource table generation unit to generate,
A transmitter that transmits data indicating the relationship between the received power in the mobile terminal device generated by the assumed radio resource table generation unit and the throughput when the mobile terminal device receives data from the base station device;
A base station apparatus comprising: A wireless communication system comprising a plurality of mobile terminal devices and a wireless base station device that communicates with the plurality of mobile terminal devices,
At least one of the mobile terminal devices is
A receiver for receiving a radio signal;
Based on the radio signal received by the reception unit, a communication restriction determination unit that determines whether or not communication restriction is received from a base station device that is in the area,
A serving cell throughput index generating unit that generates a serving cell throughput index that is an index indicating a throughput of communication with the base station apparatus that is in the service area;
Transition destination that generates a destination cell throughput index that is an index indicating the throughput of communication with the base station apparatus that can be located when the base station apparatus other than the base station apparatus that is located is migrated A cell throughput index generation unit;
When it is determined that the communication restriction determination unit is subject to communication restriction, it is determined whether or not to move the base station apparatus in the area based on the area cell throughput index and the destination cell throughput index And, if it is determined to shift, a communication control unit that shifts the base station device in the area,
Comprising
At least one of the base station devices is
A communication control unit that determines allocation of radio resources to mobile terminal devices;
A communication restriction setting unit for determining whether to perform communication restriction based on a radio resource amount allocated by the communication control unit;
Comprising
When the communication control unit determines that the communication restriction setting unit performs communication restriction, the communication restriction setting unit performs communication restriction on a radio resource amount to be allocated to a mobile terminal device that does not satisfy a predetermined condition. Less than if you decide not to,
A wireless communication system.

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