WO2011090074A1 - 移動通信システム、ネットワーク装置及び移動通信方法 - Google Patents
移動通信システム、ネットワーク装置及び移動通信方法 Download PDFInfo
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- WO2011090074A1 WO2011090074A1 PCT/JP2011/050873 JP2011050873W WO2011090074A1 WO 2011090074 A1 WO2011090074 A1 WO 2011090074A1 JP 2011050873 W JP2011050873 W JP 2011050873W WO 2011090074 A1 WO2011090074 A1 WO 2011090074A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- the present invention relates to a mobile communication system having a plurality of public cells having different communication frequencies and at least one specific cell, a network device used in the mobile communication system, and a mobile communication method.
- a specific cell called a CSG (Closed Subscriber Group) cell, a home cell, or a femto cell is known (for example, Non-Patent Document 1).
- An access type can be set for a specific cell.
- the access type is “Closed”, “Hybrid”, or “Open”.
- the specific cell of “Closed” is configured such that only the service provided to a specific user (UE; User Equipment) is permitted.
- the specific cell of “Hybrid” is configured such that higher-quality communication is permitted for a specific user than for other users (non-specific users).
- the specific cell of “Open” is configured to be allowed to provide services to all users, like a general public cell.
- the mobile communication terminal measures the reception quality of the downlink signal from each public cell, and the mobile communication terminal reports the measured reception quality to the network side. Based on the reception quality reported from the mobile communication terminal, the network side selects a public cell with good reception quality from among a plurality of public cells as a communication cell (for example, Patent Document 1).
- the network side selects, as a communication cell, a public cell with a small congestion status from a plurality of public cells based on the congestion status of each public cell (for example, Patent Document 2). In the second method, it is not necessary to report reception quality from the mobile communication terminal to the network side.
- the time required until a communication cell is selected is lengthened and a control delay occurs.
- the second method there may be a case where an appropriate communication cell cannot be selected for the following reason. Specifically, in a situation where a public cell and a specific cell are mixed, a downlink signal from the specific cell interferes with a downlink signal from the public cell. Therefore, even if a communication cell is selected based on the congestion status of a specific cell, a specific cell with poor downlink signal reception quality may be selected as a communication cell due to downlink signal interference from the specific cell.
- the present invention has been made to solve the above-described problem. Even in a situation where a plurality of public cells and a specific cell are mixed, a public cell suitable as a communication cell is selected from the plurality of public cells. It is an object of the present invention to provide a mobile communication system, a network device, and a mobile communication method that make it possible to select a cell.
- the mobile communication system includes a plurality of public cells having different communication frequencies and at least one specific cell.
- the mobile communication system has a service area that overlaps the service area of a public cell, and is configured to manage information on a specific cell that uses the same frequency as the public cell for each of the plurality of public cells.
- a specific cell information management unit, a receiving unit configured to receive a communication request signal from a mobile communication terminal located in any of the plurality of public cells, and a communication request signal from the mobile communication terminal
- a selection unit configured to select a communication frequency used by the mobile communication terminal from among communication frequencies of the plurality of public cells based on information managed by the specific cell information management unit. .
- the specific cell information management unit has a service area that overlaps a service area of a public cell, and determines the number of specific cells that use the same frequency as the public cell as the plurality of public cells. Manage each cell.
- the specific cell information management unit has a service area overlapping with a service area of a public cell, and the area of the service area of the specific cell using the same frequency as the public cell is Manage for each public cell.
- the mobile communication system further includes a calculation unit that calculates the area of the service area of the specific cell based on the transmission power and the antenna beam width of the specific cell.
- the selection unit in addition to the information managed by the specific cell information management unit, the selection unit, based on the congestion status of the plurality of public cells, among communication frequencies of the plurality of public cells, A communication frequency used by the mobile communication terminal is selected.
- the network device is configured to manage a plurality of public cells having different communication frequencies and at least one specific cell.
- the network device has a service area that overlaps with a service area of a public cell, and is configured to manage information on a specific cell that uses the same frequency as the public cell for each of the plurality of public cells.
- a specific cell information management unit a receiving unit configured to receive a communication request signal from a mobile communication terminal located in any of the plurality of public cells, and a communication request signal from the mobile communication terminal
- a selection unit configured to select a communication frequency used by the mobile communication terminal from communication frequencies of the plurality of public cells based on information managed by the specific cell information management unit.
- the mobile communication method according to the third feature is applied to a mobile communication system having a plurality of public cells having different communication frequencies and at least one specific cell.
- the mobile communication method has a service area that overlaps with a service area of a public cell, and manages information of a specific cell that uses the same frequency as the public cell for each of the plurality of public cells; Step B of receiving a communication request signal from a mobile communication terminal located in any of the plurality of public cells, and based on the information managed in Step A according to the communication request signal from the mobile communication terminal And C for selecting a communication frequency used by the mobile communication terminal from among the communication frequencies of the plurality of public cells.
- FIG. 1 is a diagram showing a mobile communication system 100 according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration example of a cell according to the first embodiment.
- FIG. 3 is a diagram illustrating the network device 20 according to the first embodiment.
- FIG. 4 is a flowchart showing the operation of the mobile communication system 100 according to the first embodiment.
- FIG. 5 is a diagram illustrating a method for acquiring information on a specific cell according to the first modification.
- FIG. 6 is a diagram illustrating a method for acquiring information on a specific cell according to the first modification.
- FIG. 7 is a diagram illustrating a method of acquiring information on a specific cell according to the first modification.
- FIG. 1 is a diagram showing a mobile communication system 100 according to the first embodiment.
- FIG. 2 is a diagram illustrating a configuration example of a cell according to the first embodiment.
- FIG. 3 is a diagram illustrating the network device 20 according to the first embodiment.
- FIG. 4 is
- FIG. 8 is a diagram illustrating a method of acquiring information on a specific cell according to the first modification.
- FIG. 9 is a diagram illustrating the network device 20 according to the second modification.
- FIG. 10 is a diagram illustrating the mobile communication system 100 according to the third modification.
- the mobile communication system includes a plurality of public cells having different communication frequencies and at least one specific cell.
- the mobile communication system has a service area that overlaps with the service area of a public cell, and is configured to manage information on a specific cell that uses the same frequency as the public cell for each of the plurality of public cells.
- Specific cell information management unit, receiving unit configured to receive a communication request signal from a mobile communication terminal residing in one of a plurality of public cells, and specified according to a communication request signal from the mobile communication terminal
- a selection unit configured to select a communication frequency used by the mobile communication terminal from a plurality of public cell communication frequencies based on information managed by the cell information management unit.
- the selection unit has information that is managed by the specific cell information management unit, that is, has a service area that overlaps with the service area of the public cell and uses the same frequency as the public cell. Based on the cell information, the communication frequency used by the mobile communication terminal is selected from the communication frequencies of a plurality of public cells.
- the control delay can be reduced.
- the specific cell is preferably a cell that is deployed on a small scale and a large scale.
- the specific cell is preferably a cell configured by HNB (Home Node B), HeNB (Home Evolved Node B), femto BTS, and the like.
- FIG. 1 is a diagram showing a mobile communication system 100 according to the first embodiment.
- the mobile communication system 100 includes a communication terminal device 10 (hereinafter referred to as a UE 10) and a core network 50.
- the mobile communication system 100 includes a first communication system and a second communication system.
- the first communication system is a communication system compatible with, for example, UMTS (Universal Mobile Telecommunication System).
- the first communication system includes a base station 110A (hereinafter referred to as NB 110A), a home base station 110B (hereinafter referred to as HNB 110B), an RNC 120A, a home base station gateway 120B (hereinafter referred to as HNB-GW 120B), and an SGSN 130.
- NB 110A base station 110A
- HNB 110B home base station 110B
- RNC 120A home base station gateway 120B
- HNB-GW 120B home base station gateway 120B
- SGSN 130 SGSN
- the radio access network (UTRAN: Universal Terrestrial Radio Access Network) corresponding to the first communication system is configured by NB110A, HNB110B, RNC120A, and HNB-GW120B.
- the second communication system is, for example, a communication system that supports LTE (Long Term Evolution).
- the second communication system includes, for example, a base station 210A (hereinafter, eNB 210A), a home base station 210B (hereinafter, HeNB 210B), a home base station gateway 220B (hereinafter, HeNB-GW 220B), and an MME 230.
- eNB 210A a base station 210A
- HeNB 210B home base station gateway 220B
- MME 230 MME
- a radio access network (E-UTRAN: Evolved Universal Terrestrial Access Network) corresponding to the second communication system is configured by the eNB 210A, the HeNB 210B, and the HeNB-GW 220B.
- E-UTRAN Evolved Universal Terrestrial Access Network
- the UE 10 is a device (User Equipment) configured to communicate with the first communication system or the second communication system.
- the UE 10 has a function of performing wireless communication with the NB 110A and the HNB 110B.
- the UE 10 has a function of performing wireless communication with the eNB 210A and the HeNB 210B.
- the NB 110A has a public cell 111A and is a device (NodeB) that performs radio communication with the UE 10 existing in the public cell 111A.
- NodeB a device that performs radio communication with the UE 10 existing in the public cell 111A.
- the HNB 110B has a specific cell 111B and is a device (Home NodeB) that performs radio communication with the UE 10 existing in the specific cell 111B.
- the RNC 120A is connected to the NB 110A and is a device (Radio Network Controller) that sets up a radio connection (RRC Connection) with the UE 10 existing in the public cell 111A.
- the HNB-GW 120B is a device (Home NodeB Gateway) that is connected to the HNB 110B and sets up a radio connection (RRC Connection) with the UE 10 existing in the specific cell 111B.
- RRC Connection Radio Connection
- SGSN 130 is a device (Serving GPRS Support Node) that performs packet switching in the packet switching domain.
- the SGSN 130 is provided in the core network 50.
- an apparatus MSC: Mobile Switching Center
- MSC Mobile Switching Center
- the eNB 210A has a public cell 211A and is an apparatus (evolved NodeB) that performs radio communication with the UE 10 existing in the public cell 211A.
- the HeNB 210B has a specific cell 211B and is a device (Home evolved NodeB) that performs radio communication with the UE 10 existing in the specific cell 211B.
- the HeNB-GW 220B is connected to the HeNB 210B and is a device (Home evolved NodeB Gateway) that manages the HeNB 210B.
- the MME 230 is an apparatus (Mobility Management Entity) that manages the mobility of the UE 10 that is connected to the eNB 210A and has established a wireless connection with the HeNB 210B. Further, the MME 230 is a device that manages the mobility of the UE 10 that is connected to the HeNB 210B via the HeNB-GW 220B and has established a radio connection with the HeNB 210B.
- Mobility Management Entity Mobility Management Entity
- the public cell and the specific cell should be understood as a function of performing radio communication with the UE 10.
- the public cell and the specific cell are also used as terms indicating the service area of the cell.
- cells such as public cells and specific cells are identified by the frequency, spreading code or time slot used in the cells.
- the specific cell may be referred to as a femto cell, a CSG (Closed Subscriber Group) cell, a home cell, or the like. Further, the specific cell is configured such that an access type that defines the UE 10 that can access the specific cell can be set.
- the access type is “Closed”, “Hybrid”, or “Open”.
- the specific cell of “Closed” is configured such that only the service provided to the specific user managed by the specific cell is permitted.
- the specific cell of “Hybrid” is configured so that, for example, high-quality communication is permitted for a specific user managed by the specific cell, and is best for a non-specific user not managed by the specific cell. It is configured to allow effort quality communication.
- the specific cell of “Open” is configured to be allowed to provide services to all the UEs 10 in the same manner as the public cell.
- the difference in communication quality between the UEs 10 is not distinguished depending on whether or not the cell is managed by the specific cell.
- the access type may be “ACCESS CLASS BARRED” for prohibiting access of the UE 10 for each access class, and “CELL BARRED” for prohibiting access of the UE 10 for each cell.
- FIG. 2 is a diagram illustrating a configuration example of a cell according to the first embodiment.
- four frequencies f1 to f4 will be described as an example.
- the public cell 311A, the public cell 312A, the public cell 313A, and the public cell 314A have the same service area.
- one specific cell 311B having a service area overlapping with the service area of the public cell 311A is provided. That is, the specific cell 311B has a service area that overlaps the service area of the public cell 311A, and is a cell that uses the public cell 311A.
- the specific cell 312B has a service area that overlaps the service area of the public cell 312A, and is a cell that uses the public cell 312A.
- the specific cell 313B has a service area that overlaps the service area of the public cell 313A, and is a cell that uses the public cell 313A.
- a specific cell having a service area overlapping with the service area of the public cell 314A is not provided.
- the public cells 111A and public cells 211A are generally referred to as public cells 311A to 314A without distinguishing between the public cell 111A and the public cell 211A.
- the specific cells in general are referred to as specific cells 311B to 313B without distinguishing the specific cells 111B and the specific cells 211B.
- the public cell 314A is less susceptible to interference from the specific cell.
- the public cell 313A is likely to receive interference from the specific cell 313B.
- FIG. 3 is a diagram illustrating the network device 20 according to the first embodiment.
- the network device 20 includes a communication unit 21, a specific cell information management unit 22, a public cell information management unit 23, and a selection unit 24.
- the network device 20 may be a device that manages a public cell (for example, the NB 110A and the eNB 210A).
- the network device 20 may be a device (for example, the RNC 120A, the SGSN 130, or the MME 230) provided at a higher level than the device that manages the public cell.
- the communication unit 21 communicates with the UE 10.
- the communication unit 21 communicates with other network devices.
- the communication unit 21 receives a communication request signal from the UE 10 located in any of a plurality of public cells (public cells 311A to 314A) provided under the network device 20.
- the specific cell information management unit 22 has a service area overlapping with the service area of the public cell, and manages information on the specific cell using the same frequency as that of the public cell for each of the plurality of specific cells.
- the specific cell information management unit 22 may have a service area that overlaps with the service area of the public cell, and may manage the number of specific cells that use the same frequency as the public cell.
- the specific cell information management unit 22 may have a service area that overlaps with the service area of the public cell, and may manage the area of the service area of the specific cell that uses the same frequency as the public cell.
- the area of the service area of the specific cell may be an area of only a portion overlapping with the public cell.
- the specific cell information management unit 22 manages the information of the specific cell 311B (for example, the number of the specific cells 311B or the area of the service area of the specific cell 311B) in association with the public cell 311A.
- the specific cell information management unit 22 manages information on the specific cell 312B (for example, the number of the specific cells 312B or the area of the service area of the specific cell 312B) in association with the public cell 312A, and information on the specific cell 313B ( For example, the number of specific cells 313B or the area of the service area of the specific cell 313B) is managed in association with the public cell 313A.
- the specific cell information management unit 22 manages that there is no specific cell in association with the public cell 314A.
- the public cell information management unit 23 manages the congestion status of a plurality of public cells (public cells 311A to 314A) provided under the network device 20.
- the congestion status may be the traffic amount in each public cell, the number of codes used in each public cell, or the number of UEs 10 located in each public cell.
- the selection unit 24 selects a communication frequency used by the UE 10 from a plurality of public cell communication frequencies based on information managed by the specific cell information management unit 22 in response to a communication request signal from the UE 10. That is, the selection unit 24 has a service area that overlaps the service area of the public cell, and selects a communication frequency used by the UE 10 based on information on a specific cell that uses the same frequency as the public cell.
- the selection unit 24 may select a communication frequency used by the UE 10 based only on information managed by the specific cell information management unit 22.
- the selection unit 24 selects a public cell (communication frequency) associated with the smallest number of specific cells.
- the selection unit 24 selects a public cell (frequency) associated with a specific cell having the smallest service area.
- the selection unit 24 selects the frequency f4 of the public cell 314A as the communication frequency used by the UE 10.
- the selection unit 24 may select a communication frequency used by the UE 10 based on the congestion status of a plurality of public cells in addition to the information managed by the specific cell information management unit 22.
- the selection unit 24 weights the congestion status of the public cell so that the priority of the public cell increases as the number of specific cells associated with the public cell decreases. Subsequently, the selection unit 24 selects a public cell (communication frequency) having the smallest weighted congestion state. Or the selection part 24 weights the congestion condition of the said public cell so that the priority of the said public cell becomes high, so that the area of the service area of the specific cell linked
- the selection unit 24 weights the congestion state of the public cell 314A so that the priority of the public cell 314A becomes higher. Conversely, the selection unit 24 weights the congestion status of the public cell 313A so that the priority of the public cell 313A becomes lower.
- FIG. 4 is a flowchart showing the operation of the network device 20 according to the first embodiment.
- FIG. 4 illustrates a case where the congestion state of the public cell is weighted by the number of specific cells associated with the public cell.
- the embodiment is of course not limited to this.
- the network device 20 sends a communication request signal from the UE 10 located in any of a plurality of public cells (public cells 311A to 314A) provided under the network device 20. Receive.
- the network device 20 determines a public cell (communication frequency) candidate group (hereinafter, communication cell candidate group) used by the UE 10.
- the communication cell candidate group is a public cell group having the same service area as the public cell that relays the communication request signal.
- step 12 the network device 20 determines whether there is a communication cell candidate that has not been subjected to the weighting processing shown in steps 14 to 19 in the communication cell candidate group. When there is such a communication cell candidate, the network device 20 proceeds to the process of step 13. On the other hand, when there is no such communication cell candidate, the network device 20 proceeds to the process of step 20.
- step 13 the network device 20 selects a communication cell candidate to be subjected to the weighting process shown in steps 14 to 19.
- step 14 the network device 20 determines whether or not the number of specific cells associated with the communication cell candidate selected in step 13 is smaller than the threshold value a. When the number of specific cells is smaller than the threshold value a, the network device 20 returns to the process of step 12. On the other hand, when the number of specific cells is greater than or equal to the threshold value a, the network device 20 proceeds to the process of step 15.
- step 15 the network device 20 determines whether or not the number of specific cells associated with the communication cell candidate selected in step 13 is smaller than the threshold value b (> threshold value a). If the number of specific cells is smaller than the threshold value b, the network device 20 proceeds to the process of step 16. On the other hand, when the number of specific cells is greater than or equal to the threshold value b, the network device 20 proceeds to the process of step 17.
- the network device 20 applies the priority A to the communication cell candidate selected in step 13.
- the priority A is a value that reduces the possibility that a communication cell candidate is selected as a communication cell.
- the network device 20 weights the congestion status of the communication cell candidates selected in Step 13 by the priority A.
- step 17 the network device 20 determines whether or not the number of specific cells associated with the communication cell candidate selected in step 13 is smaller than the threshold c (> threshold b). If the number of specific cells is smaller than the threshold value c, the network device 20 proceeds to the process of step 18. On the other hand, when the number of specific cells is equal to or greater than the threshold value c, the network device 20 proceeds to the process of step 19.
- the network device 20 applies the priority B to the communication cell candidate selected in step 13.
- the priority B is a value that reduces the possibility that a communication cell candidate is selected as a communication cell than the priority A.
- the network device 20 weights the congestion status of the communication cell candidates selected in step 13 by the priority B.
- the network device 20 applies the priority C to the communication cell candidate selected in step 13.
- the priority C is a value that reduces the possibility that a communication cell candidate is selected as a communication cell than the priority B.
- the network device 20 weights the congestion status of the communication cell candidates selected in Step 13 by the priority C.
- the network device 20 selects a public cell (communication frequency) used by the UE 10 based on the congestion status weighted by the priority. Specifically, the network device 20 selects a public cell having the smallest congestion status weighted by priority as a communication cell.
- step 21 the network device 20 notifies the UE 10 of the public cell (communication frequency of the public cell) selected as the communication cell in step 20.
- the selection unit 24 has information that is managed by the specific cell information management unit 22, that is, a service area that overlaps the service area of the public cell, and has the same frequency as that of the public cell. Based on the information of the specific cell to be used, the communication frequency (public cell) used by the UE 10 is selected from the communication frequencies of a plurality of public cells.
- the communication frequency (public cell) used by the UE 10 can be selected in consideration of interference from a specific cell.
- Modification 1 illustrates a method of collecting information on a specific cell that has a service area that overlaps the service area of the public cell and that uses the same frequency as the public cell.
- Case 1 a specific cell radio base station and a public cell radio base station exist under the network device 20.
- the public cell radio base station is the NB 110A or the eNB 210A.
- the specific cell radio base station is the HNB 110B or the HeNB 210B.
- the specific cell radio base station receives broadcast information periodically broadcast from the public cell radio base station.
- the broadcast information includes at least public cell information such as an identifier for identifying a public cell managed by the public cell radio base station and a frequency used in the public cell managed by the public cell radio base station.
- the specific cell radio base station reports the public cell information included in the broadcast information to the network device 20.
- the network device can identify a public cell having a service area overlapping with the service area of the specific cell radio base station based on the public cell information.
- the network device has a service area that overlaps with the service area of the public cell, and can acquire information on a specific cell that uses the same frequency as the public cell.
- the network device 20 instructs the radio base station for a specific cell to acquire broadcast information.
- the specific cell radio base station receives broadcast information periodically broadcast from the public cell radio base station.
- the specific cell radio base station reports the public cell information included in the broadcast information to the network device 20.
- Case 3 (Case 3)
- a network device 20 having a public cell radio base station under its control is different from a network device 20X having a specific cell radio base station under its control.
- the network device 20 requests information on a specific cell from the network device 20X.
- the network device 20X instructs the specific cell radio base station to acquire broadcast information.
- the specific cell radio base station receives broadcast information periodically broadcast from the public cell radio base station.
- the specific cell radio base station reports the public cell information included in the broadcast information to the network device 20X.
- the network device 20X notifies the public cell information to the network device 20.
- Case 4 (Case 4)
- the network device 20 having a public cell radio base station under its control is different from the network device 20X having a specific cell radio base station under its control.
- the network device 20 instructs the public cell radio base station to broadcast the broadcast information.
- the specific cell radio base station receives broadcast information broadcast from the public cell radio base station.
- the specific cell radio base station reports the public cell information included in the broadcast information to the network device 20X.
- the network device 20X notifies the public cell information to the network device 20.
- the network device 20 includes a calculation unit 25 in addition to the configuration shown in FIG.
- the calculation unit 25 calculates the area of the service area of the specific cell based on the transmission power and the antenna beam width of the specific cell.
- the transmission power and antenna beam width of the specific cell may be notified to the network device 20 from the specific cell radio base station.
- the upper node of the HNB 110B is the HNB-GW 120B.
- the upper node of the HNB 110B is the RNC 120A.
- the RNC 120A manages the HNB 110B instead of the HNB-GW 120B. That is, the RNC 120A provides functions similar to those of the HNB-GW 120B to devices belonging to the RNC 120A.
- the upper node of the HeNB 210B is the HeNB-GW 220B.
- the upper node of the HeNB 210B is the MME 230.
- the HeNB 210B provides the same function as the HeNB-GW 220B to devices belonging to the HeNB 210B instead of the HeNB-GW 220B.
- HNB-GW 120B may be omitted, or only the HeNB-GW 220B may be omitted.
- the configuration (communication unit 21, specific cell information management unit 22, public cell information management unit 23, selection unit 24, and calculation unit 25) provided in the network device 20 is provided in one device. Illustrated. However, the embodiment is not limited to this. That is, the communication unit 21, the specific cell information management unit 22, the public cell information management unit 23, the selection unit 24, and the calculation unit 25 may be provided in different devices.
- the specific cell information management unit 22 or the public cell information management unit 23 may be provided in a server provided in the core network 50.
- RANAP Radio Access Network Application Part
- NBAP Node B Application Part
- RNSAP Radio Network Subpart AppH
- NBSAP Radio Network Subpart AppH
- the operation of the network device 20 may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both.
- Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
- Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the network device 20. Further, the storage medium and the processor may be provided in the network device 20 as a discrete component.
- the mobile communication system and network which can select an appropriate public cell as a communication cell from a some public cell even in the situation where a some public cell and a specific cell are mixed. Since an apparatus and a mobile communication method can be provided, it is useful in wireless communication and the like.
- DESCRIPTION OF SYMBOLS 10 ... Communication terminal device, 20 ... Network device, 21 ... Communication part, 22 ... Specific cell information management part, 23 ... Public cell information management part, 24 ... Selection part, 25 ... Calculation part, 50 ... Core network, 100 ... Movement 110A ... NB, 110B ... HNB, 111A ... public cell, 111B ... specific cell, 120A ... RNC, 120B ... HNB-GW, 130 ... SGSN, 210A ... eNB, 210B ... HeNB, 211A ... public cell, 211B ... Specific cell, 220B ... HeNB-GW, 230 ... MME, 311A to 314A ... Public cell, 311B to 314B ... Specific cell
Abstract
Description
実施形態に係る移動通信システムは、通信周波数が互いに異なる複数の公衆セルと、少なくとも1つの特定セルとを有する。移動通信システムは、公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルの情報を、複数の公衆セル毎に管理するように構成された特定セル情報管理部と、複数の公衆セルのいずれかに在圏する移動通信端末から通信要求信号を受信するように構成された受信部と、移動通信端末からの通信要求信号に応じて、特定セル情報管理部で管理される情報に基づいて、複数の公衆セルの通信周波数の中から、移動通信端末が用いる通信周波数を選択するように構成された選択部とを備える。
(移動通信システムの構成)
以下において、第1実施形態に係る移動通信システムの構成について、図面を参照しながら説明する。図1は、第1実施形態に係る移動通信システム100を示す図である。
以下において、第1実施形態に係るセルの構成例について、図面を参照しながら説明する。図2は、第1実施形態に係るセルの構成例を示す図である。ここでは、4つの周波数(f1~f4)を例に挙げて説明する。また、公衆セル311A、公衆セル312A、公衆セル313A及び公衆セル314Aは、同一のサービスエリアを有する。
以下において、第1実施形態に係るネットワーク装置の構成について、図面を参照しながら説明する。図3は、第1実施形態に係るネットワーク装置20を示す図である。図3に示すように、ネットワーク装置20は、通信部21と、特定セル情報管理部22と、公衆セル情報管理部23と、選択部24とを有する。
以下において、第1実施形態に係るネットワーク装置の動作について、図面を参照しながら説明する。図4は、第1実施形態に係るネットワーク装置20の動作を示すフロー図である。
第1実施形態では、選択部24は、特定セル情報管理部22で管理される情報、すなわち、公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルの情報に基づいて、複数の公衆セルの通信周波数の中から、UE10が用いる通信周波数(公衆セル)を選択する。
以下において、第1実施形態の変更例1について、図面を参照しながら説明する。以下においては、第1実施形態との相違点について主として説明する。
以下において、ケース1について、図5を参照しながら説明する。ケース1では、特定セル用無線基地局及び公衆セル用無線基地局がネットワーク装置20の配下に存在する。なお、公衆セル用無線基地局は、NB110A又はeNB210Aである。特定セル用無線基地局は、HNB110B又はHeNB210Bである。
以下において、ケース2について、図6を参照しながら説明する。なお、ケース1と重複する説明については省略する。
以下において、ケース3について、図7を参照しながら説明する。なお、ケース1と重複する説明については省略する。ケース1では、公衆セル用無線基地局を配下に有するネットワーク装置20は、特定セル用無線基地局を配下に有するネットワーク装置20Xと異なっている。
以下において、ケース4について、図8を参照しながら説明する。なお、ケース1と重複する説明については省略する。ケース4では、公衆セル用無線基地局を配下に有するネットワーク装置20は、特定セル用無線基地局を配下に有するネットワーク装置20Xと異なっている。
以下において、第1実施形態の変更例1について、図面を参照しながら説明する。以下においては、第1実施形態との相違点について主として説明する。
以下において、第1実施形態の変更例3について、図面を参照しながら説明する。以下においては、第1実施形態との相違点について主として説明する。
本発明は上述した実施形態によって説明したが、この開示の一部をなす論述及び図面は、この発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなろう。
Claims (7)
- 通信周波数が互いに異なる複数の公衆セルと、少なくとも1つの特定セルとを有する移動通信システムであって、
公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルの情報を、前記複数の公衆セル毎に管理するように構成された特定セル情報管理部と、
前記複数の公衆セルのいずれかに在圏する移動通信端末から通信要求信号を受信するように構成された受信部と、
前記移動通信端末からの通信要求信号に応じて、前記特定セル情報管理部で管理される情報に基づいて、前記複数の公衆セルの通信周波数の中から、前記移動通信端末が用いる通信周波数を選択するように構成された選択部とを備えることを特徴とする移動通信システム。 - 前記特定セル情報管理部は、公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルの数を、前記複数の公衆セル毎に管理することを特徴とする請求項1に記載の移動通信システム。
- 前記特定セル情報管理部は、公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルのサービスエリアの面積を、前記複数の公衆セル毎に管理することを特徴とする請求項1に記載の移動通信システム。
- 特定セルの送信電力及びアンテナビーム幅に基づいて、当該特定セルのサービスエリアの面積を算出する算出部をさらに備えることを特徴とする請求項3に記載の移動通信システム。
- 前記選択部は、前記特定セル情報管理部で管理される情報に加えて、前記複数の公衆セルの混雑状況に基づいて、前記複数の公衆セルの通信周波数の中から、前記移動通信端末が用いる通信周波数を選択することを特徴とする請求項1に記載の移動通信システム。
- 通信周波数が互いに異なる複数の公衆セルと、少なくとも1つの特定セルとを管理するように構成されたネットワーク装置であって、
公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルの情報を、前記複数の公衆セル毎に管理するように構成された特定セル情報管理部と、
前記複数の公衆セルのいずれかに在圏する移動通信端末から通信要求信号を受信するように構成された受信部と、
前記移動通信端末からの通信要求信号に応じて、前記特定セル情報管理部で管理される情報に基づいて、前記複数の公衆セルの通信周波数の中から、前記移動通信端末が用いる通信周波数を選択するように構成された選択部とを備えることを特徴とするネットワーク装置。 - 通信周波数が互いに異なる複数の公衆セルと、少なくとも1つの特定セルとを有する移動通信システムに適用される移動通信方法であって、
公衆セルのサービスエリアと重複するサービスエリアを有しており、かつ、当該公衆セルと同周波数を用いる特定セルの情報を、前記複数の公衆セル毎に管理するステップAと、
前記複数の公衆セルのいずれかに在圏する移動通信端末から通信要求信号を受信するステップBと、
前記移動通信端末からの通信要求信号に応じて、前記ステップAで管理される情報に基づいて、前記複数の公衆セルの通信周波数の中から、前記移動通信端末が用いる通信周波数を選択するステップCとを備えることを特徴とする移動通信方法。
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