WO2011067824A1 - Station de base sans fil, procede de commande de communications, et systeme de communications sans fil - Google Patents

Station de base sans fil, procede de commande de communications, et systeme de communications sans fil Download PDF

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Publication number
WO2011067824A1
WO2011067824A1 PCT/JP2009/070172 JP2009070172W WO2011067824A1 WO 2011067824 A1 WO2011067824 A1 WO 2011067824A1 JP 2009070172 W JP2009070172 W JP 2009070172W WO 2011067824 A1 WO2011067824 A1 WO 2011067824A1
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WIPO (PCT)
Prior art keywords
cell
base station
radio base
cells
neighboring
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PCT/JP2009/070172
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English (en)
Japanese (ja)
Inventor
宏行 藤井
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富士通株式会社
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Priority to PCT/JP2009/070172 priority Critical patent/WO2011067824A1/fr
Publication of WO2011067824A1 publication Critical patent/WO2011067824A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to a radio base station, a communication control method, and a radio communication system.
  • a wireless terminal device which is a subscriber station, belongs to one of the cells and performs wireless communication with a wireless base station that manages the cell (located cell).
  • each radio base station holds adjacent cell information indicating other cells adjacent to the cell managed by the base station.
  • the neighboring cell information is used for controlling handover of the wireless terminal device, for example. That is, the radio base station notifies neighboring cell information to the wireless terminal device, and the wireless terminal device measures the reception level of the neighboring cell based on the acquired neighboring cell information. The measurement result is used to determine the handover destination cell.
  • neighboring cell information about the newly installed cell is registered in the radio base station that manages the newly installed cell.
  • a method of generating the neighbor cell information of the newly installed cell a method of using the reception level measurement result by the mobile device can be considered. For example, a method in which an investigator moves in a new cell together with a dedicated mobile device, measures the reception level of a radio signal at each point, and detects an adjacent cell can be considered. Another possible method is to have the mobile device used by the user report the measurement result of the reception level and detect the neighboring cell from the measurement result.
  • a dedicated terminal connected to the network acquires the location information of each cell in a certain area, and the cells are arranged in the order of proximity to the newly installed cell. (See, for example, paragraphs [0033] to [0035] of Patent Document 1).
  • the newly established radio base station transmits the status information to the base station control station which is the upper station via one of the neighboring radio base stations.
  • the base station control station transfers state information to other surrounding radio base stations (see, for example, paragraphs [0021] to [0023] of Patent Document 2).
  • the burden of measurement becomes a problem. That is, when the investigator performs measurement using a dedicated mobile device, the work load on the investigator is large. In addition, when the measurement result is reported to the mobile device used by the user, the load is applied to the mobile device and the power consumption is increased.
  • the method described in Patent Document 1 has a problem that a cell that is not preferable as a neighboring cell may be registered in the neighboring cell information. That is, not all of the cells that are close to the newly installed cell are necessarily preferable cells as neighboring cells. For example, radio wave shielding occurs due to the influence of a building or the like, and there is a possibility that handover cannot be performed even between cells that are close to each other.
  • the method described in Patent Document 2 has a problem of how to specify the range of surrounding radio base stations to which state information should be notified.
  • the present invention has been made in view of such a point, and an object thereof is to provide a radio base station, a communication control method, and a radio communication system that can appropriately detect a neighboring cell of a certain cell.
  • a radio base station that is used in a radio communication system including a plurality of first cells and manages a second cell different from the plurality of first cells.
  • This radio base station has a receiving unit and a control unit.
  • the receiving unit receives, from each of a plurality of other radio base stations, neighboring cell information indicating neighboring cells of the first cell managed by the other radio base station.
  • the control unit detects a neighboring cell of the second cell from the plurality of first cells based on the neighboring relationship between the plurality of first cells indicated by the neighboring cell information received by the receiving unit. .
  • a communication control method for a wireless communication system includes a plurality of first cells and can install a second cell different from the plurality of first cells.
  • the neighboring cell information indicating the neighboring cell of the first cell managed by the wireless base station is received from each of the plurality of wireless base stations included in the wireless communication system. Based on the neighboring relationship between the plurality of first cells indicated by the received neighboring cell information, the neighboring cell of the second cell is detected from the plurality of first cells.
  • a radio communication system having a plurality of first radio base stations and second radio base stations.
  • Each of the first radio base stations manages at least one first cell and holds neighboring cell information indicating neighboring cells of the first cell managed by the own radio station.
  • the second radio base station manages a second cell different from the first cell. Further, the second radio base station receives neighboring cell information from each of the plurality of first radio base stations, and based on the neighboring relationship between the plurality of first cells indicated by the received neighboring cell information, An adjacent cell of the second cell is detected from among the plurality of first cells.
  • FIG. 1 is a diagram illustrating a wireless communication system according to the first embodiment.
  • the radio communication system according to the first embodiment includes radio base stations 1 to 3.
  • the radio base station 1 and the radio base stations 2 and 3 are connected via a network (not shown).
  • a network not shown.
  • another communication device such as an upper station may be provided.
  • cells 4a, 4b, 4c (first cell) and cell 4d (second cell) are formed.
  • the radio base station 1 manages the cell 4d.
  • the radio base station 2 manages the cells 4a and 4b, and holds neighboring cell information 5a indicating neighboring cells of the cells 4a and 4b.
  • the radio base station 3 manages the cell 4c and holds neighboring cell information 5b indicating the neighboring cell of the cell 4c.
  • the adjacent cell information 5a, 5b can be used for controlling handover between the cells 4a, 4b, 4c, for example.
  • the radio base station 1 generates or updates neighboring cell information for the cell 4d.
  • the radio base station 1 includes a receiving unit 1a and a control unit 1b.
  • the receiving unit 1a receives neighboring cell information 5a and 5b from the wireless base stations 2 and 3 via the network, respectively.
  • the control unit 1b requests neighboring cell information from the radio base stations 2 and 3 via a transmitting unit (not shown), and the receiving unit 1a receives the neighboring cell information 5a and 5b as a response to the request.
  • information for example, the address of the requesting partner
  • indicating the partner requesting the neighboring cell information may be held in advance by the control unit 1b, or a predetermined device (see FIG. (Not shown).
  • the control unit 1b detects the neighboring cell of the cell 4d managed by the radio base station 1 using the neighboring cell information 5a and 5b received by the receiving unit 1a. Specifically, the control unit 1b specifies the adjacent relationship between the cells 4a, 4b, and 4c managed by the radio base stations 2 and 3 based on the adjacent cell information 5a and 5b. Then, based on the specified adjacent relationship, a cell that is preferable as the adjacent cell of the cell 4d is selected from the cells 4a, 4b, and 4c. That is, of the cells 4a, 4b, and 4c, cells that are not preferable as neighboring cells of the cell 4d are excluded.
  • control unit 1b specifies the number of adjacent cells of each of the cells 4a, 4b, and 4c as the adjacent relationship. Then, the cell having the number of adjacent cells equal to or larger than the predetermined threshold is selected as the adjacent cell of the cell 4d, and the cell having the number of adjacent cells less than the threshold is excluded from the adjacent cells of the cell 4d.
  • cells that are not closely adjacent to neighboring cells, such as isolated cells are determined to be unfavorable as neighboring cells of the cell 4d. This is because such a cell is likely to be difficult to perform handover with the cell 4d.
  • control unit 1b may further detect the adjacent cell of the cell 4d using the position information of the cells 4a, 4b, and 4c.
  • the receiving unit 1a receives the position information of the cells 4a, 4b, and 4c (for example, information including the latitude and longitude of the center of each cell) from the radio base stations 2 and 3.
  • the control unit 1b extracts cells within a predetermined range from the cell 4d (for example, a cell whose distance between the cell centers is equal to or less than a threshold value), and the adjacent relationship between the extracted cells. It is conceivable to detect neighboring cells based on the above.
  • the control unit 1b generates and holds neighboring cell information indicating the detected neighboring cell.
  • the detected neighboring cell is registered in the neighboring cell information already held.
  • the control unit 1b sends the generated or updated neighboring cell information to all or part of the radio base stations 2 and 3 from which the neighboring cell information 5a and 5b are obtained via a transmitting unit (not shown). You may send it.
  • neighboring cell information is transmitted to a radio base station that manages the detected neighboring cell.
  • the neighboring relationship with the cell 4d is also registered in the radio base station that manages the detected neighboring cell.
  • the neighboring cell information 5a and 5b is acquired from the wireless base stations 2 and 3 via the network by the receiving unit 1a of the wireless base station 1. Then, by the control unit 1b of the radio base station 1, the neighboring cell of the cell 4d is selected from the cells 4a, 4b, 4c based on the neighboring relationship of the cells 4a, 4b, 4c indicated by the neighboring cell information 5a, 5b. Detected.
  • the investigator does not have to move within the area of the cell 4d and measure the reception level of the radio signal at each point, thereby reducing the work load on the investigator.
  • the load applied to the mobile device is reduced, and deterioration in the quality of communication service can be suppressed.
  • the adjacent cell of the cell 4d can be detected appropriately. That is, cells that are not preferable as neighboring cells among neighboring cells of a certain cell can be excluded and registered in the neighboring cell information. For example, a cell in which a close adjacency with a neighboring cell is not set can be determined as an unfavorable cell as an adjacent cell.
  • one radio base station may manage only one cell, or may manage a plurality of cells. Radio base stations that manage different numbers of cells may be mixed in the system.
  • the radio base station 1 manages a plurality of cells, the above-described detection of adjacent cells can be performed for each cell managed by the radio base station 1. Note that detection of adjacent cells may be performed when, for example, the radio base station 1 is added to the radio communication system or when the cell 4d is added to the radio base station 1. Furthermore, in order to update adjacent cell information, you may perform regularly or irregularly.
  • FIG. 2 is a diagram illustrating the mobile communication system according to the second embodiment.
  • the mobile communication system according to the second embodiment includes radio base stations 10, 10a, 10b, 10c, 10d, 10e, 10f, a maintenance device 20, a mobile station 30, an MME (Mobility Management Entity) 40, and a network 50. .
  • MME Mobility Management Entity
  • the wireless base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f are wireless communication devices that can perform wireless communication with the mobile station 30.
  • the radio base stations 10, 10 a, 10 b, 10 c, 10 d, 10 e, and 10 f are connected to the network 50 and relay data between the mobile station 30 and the network 50.
  • control messages are transmitted and received between the maintenance device 20 and the MME 40 via the network 50.
  • each of the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f notifies the subordinate cell of neighboring cell information about a cell (subordinate cell) managed by the own base station.
  • the mobile station 30 belongs to the subordinate cell, the mobile station 30 receives measurement information indicating the reception level of the radio signal of the adjacent cell from the mobile station 30, and controls handover of the mobile station 30 based on the measurement information.
  • the maintenance device 20 is a device that manages a radio access network (RAN) including the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f.
  • the maintenance device 20 can be realized using a computer, for example.
  • the maintenance device 20 is connected to the network 50, and transmits and receives control messages to and from the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f to maintain the radio access network.
  • the mobile station 30 is a wireless terminal device that performs wireless communication by connecting to a wireless base station (serving base station) that manages a serving cell among the wireless base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f. is there.
  • a wireless base station serving base station
  • the mobile station 30 receives the neighboring cell information for the serving cell and measures the reception level of the radio signal of the neighboring cell based on the neighboring cell information. Then, the measurement result is reported to the serving base station regularly or irregularly.
  • the MME 40 is a device that manages the connection of the mobile station 30 to the radio access network, and is installed in a so-called core network.
  • the MME 40 is connected to the network 50, and transmits and receives control messages to and from the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f.
  • the MME 40 first performs authentication and location registration of the mobile station 30 and updates the location registration with the handover of the mobile station 30.
  • Such a mobile communication system according to the second embodiment can be realized as an LTE (Long Term Evolution) system or an LTE-A (Long Term Evolution-Advanced) system, for example.
  • the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f may be referred to as eNodeB, and the radio access network may be referred to as eUTRAN (Evolved UTMS Terrestrial Radio Access Network).
  • eUTRAN Evolved UTMS Terrestrial Radio Access Network
  • it can be realized as another type of wireless communication system such as a wireless LAN (Local Area Network).
  • radio base stations 10a, 10b, 10c, 10d, 10e, and 10f are already installed and the radio base station 10 is newly installed.
  • transmission / reception of control messages via the network 50 is performed according to IP (Internet Protocol).
  • IP Internet Protocol
  • other types of communication protocols can be employed.
  • FIG. 3 is a diagram showing an example of cell arrangement in a mobile communication system.
  • the newly installed radio base station 10 and the existing radio base stations 10a, 10b, 10c, 10d, 10e, and 10f each manage three cells.
  • the radio base station 10 manages cells #A, #B, and #C.
  • the radio base station 10a manages cells # 1, # 2, and # 7.
  • the radio base station 10b manages cells # 3, # 8, and # 9.
  • the radio base station 10c manages cells # 4, # 5, and # 10.
  • the radio base station 10d manages cells # 6, # 11, and # 12.
  • the radio base station 10e manages cells # 13, # 16, and # 17.
  • the radio base station 10f manages cells # 14, # 15, and # 18.
  • the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f form three cells by using a directional antenna or a plurality of antennas installed away from the base station apparatus main body. Can do. Such cells are sometimes called sectors. Note that the number of subordinate cells may vary depending on the radio base station.
  • the boundary of each cell (hexagonal boundary) shown in FIG. 3 is determined based on the distance from the center of the cell, that is, from the center of another cell adjacent to the distance from the center of the cell. It only shows a set of points where the distance of is equal. Therefore, there is a case where a radio signal of a certain cell extends to another cell beyond the cell boundary shown in FIG. 3 (a case where there is an overlapping cover area between cells). On the other hand, there are cases where overlapping cover areas do not exist even between adjacent cells due to the effects of buildings and topography.
  • the mobile station 30 may be able to perform handover between the two cells. In that case, it is preferable that the other cell is registered as an adjacent cell for one cell.
  • the radio signal of the cell # 3 adjacent to the cell # 2 has reached at least part of the area of the cell # 2, and the handover from the cell # 2 to the cell # 3 is possible. In that case, it is expected that cell # 3 is registered as an adjacent cell of cell # 2.
  • the radio signal of the cell # 4 not adjacent to the cell # 2 reaches at least a part of the area of the cell # 2, and the handover from the cell # 2 to the cell # 4 is possible. In that case, it is expected that cell # 4 is registered as an adjacent cell of cell # 2.
  • FIG. 4 is a block diagram showing a radio base station.
  • the radio base station 10 includes an antenna 11, a radio reception unit 12, a radio transmission unit 13, a message reception unit 14, a message transmission unit 15, a control unit 16, and a storage unit 17.
  • the radio base stations 10 a, 10 b, 10 c, 10 d, 10 e, and 10 f can also be realized by the same module configuration as that of the radio base station 10.
  • the antenna 11 is a transmitting / receiving antenna that transmits and receives radio signals.
  • the antenna 11 outputs a radio signal received from the mobile station 30 to the radio reception unit 12.
  • the transmission signal acquired from the wireless transmission unit 13 is wirelessly output.
  • a transmitting antenna and a receiving antenna may be provided separately instead of the transmitting / receiving antenna.
  • a different antenna may be provided for each subordinate cell of the radio base station 10, or a plurality of antennas may be provided for transmission diversity.
  • the radio receiving unit 12 demodulates and decodes the radio signal acquired from the antenna 11 and extracts user data and control information transmitted from the mobile station 30.
  • the extracted user data is converted into a predetermined packet format, output to the network 50, and delivered to a packet switch (not shown) provided in the core network.
  • the extracted control information is output to the control unit 16.
  • the control information extracted by the wireless reception unit 12 includes measurement information indicating the reception level of the adjacent cell measured by the mobile station 30.
  • the wireless transmission unit 13 encodes and modulates the user data addressed to the mobile station 30 acquired via the network 50 and the control information acquired from the control unit 16 to generate a transmission signal. Then, the generated transmission signal is output to the antenna 11 and is wirelessly output to the subordinate cell of the wireless base station 10.
  • the control information transmitted by the wireless transmission unit 13 includes neighboring cell information notified to the subordinate cell.
  • the wireless reception unit 12 and the wireless transmission unit 13 may be mounted as an integrated circuit.
  • the radio reception unit 12 and the radio transmission unit 13 may be provided for each subordinate cell of the radio base station 10.
  • the message receiving unit 14 receives a control message in a predetermined packet format via the network 50 from other radio base stations (radio base stations 10a, 10b, 10c, 10d, 10e, 10f), the maintenance device 20, and the MME 40. Then, the message receiving unit 14 decodes the packet, converts it into a parameter indicating the content of the control message, and outputs the parameter to the control unit 16.
  • the control message received by the message receiver 14 includes neighboring cell information transmitted by other radio base stations and address information of neighboring base stations transmitted by the maintenance device 20.
  • the message transmission unit 15 acquires a parameter from the control unit 16 and converts the parameter into a control message in a predetermined packet format. Then, the message transmission unit 15 transmits the generated packet to another radio base station, the maintenance device 20 or the MME 40 via the network 50.
  • the control message transmitted by the message transmission unit 15 includes neighboring cell information transmitted to other radio base stations and a location registration request for the mobile station 30 transmitted to the MME 40. Note that the message receiving unit 14 and the message transmitting unit 15 may be mounted as an integrated circuit.
  • the control unit 16 controls the entire operation of the radio base station 10. For example, when the mobile station 30 connects to the radio base station 10, the control unit 16 outputs a parameter to the message transmission unit 15 to cause the MME 40 to transmit a location registration request for the mobile station 30. Moreover, the neighboring cell information of the subordinate cell of the radio base station 10 is output to the radio transmitting unit 13 to notify the subordinate cell. Further, based on the measurement information of the mobile station 30 acquired from the wireless reception unit 12, it is determined whether to perform the handover of the mobile station 30. The handover is executed in cooperation with the handover destination radio base station and the MME 40.
  • control unit 16 performs initial setting when the radio base station 10 is newly installed in the mobile communication system. Specifically, when the radio base station 10 is powered on, the control unit 16 first outputs a parameter to the message transmission unit 15 to transmit a control message to the maintenance device 20. Thereafter, in cooperation with the maintenance device 20 and the other radio base station, the neighboring cell information of the subordinate cell of the radio base station 10 is generated, and the subordinate cell of the radio base station 10 is assigned to at least a part of the other radio base station. Let me register. Details of generation of neighboring cell information will be described later.
  • the storage unit 17 stores various data used by the control unit 16. As the storage unit 17, for example, a nonvolatile memory can be used. In order to access the storage unit 17 in advance, identification information (ID: Identification) of the radio base station 10, position information indicating the installation position of the radio base station 10, position information of subordinate cells of the radio base station 10, and the maintenance device 20 The address information etc. are stored.
  • ID Identification
  • the storage unit 17 stores adjacent cell information generated by the control unit 16 and temporarily stores intermediate data created when the adjacent cell information is generated.
  • FIG. 5 is a block diagram showing the maintenance device.
  • the maintenance device 20 includes a central processing unit (CPU) 21, a random access memory (RAM) 22, a hard disk drive (HDD) 23, a display processing unit 24, an input processing unit 25, and a communication unit 26. These modules are connected to the bus 27 in the maintenance device 20 and can input / output signals to / from each other.
  • the CPU 21 controls the entire operation of the maintenance device 20.
  • the CPU 21 reads a program and data stored in the HDD 23, expands it in the RAM 22, and executes processing. Note that a plurality of CPUs may be mounted on the maintenance device 20 to perform distributed processing.
  • the RAM 22 temporarily stores at least a part of a program executed by the CPU 21 and data used for processing.
  • the CPU 21 reads / writes programs and data from / to the RAM 22 as appropriate.
  • the RAM 22 or in combination with the RAM 22, other types of memories may be used.
  • the HDD 23 stores programs executed by the CPU 21 and data used for processing.
  • the program stored in the HDD 23 includes a program for managing the wireless access network.
  • the data stored in the HDD 23 includes location information and address information of the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f.
  • other types of storage devices such as SSD (Solid State Drive) may be used.
  • the display processing unit 24 is connected to the monitor 28.
  • the display processing unit 24 generates an image signal of the display screen under the control of the CPU 21 and outputs it to the monitor 28.
  • the display screen includes an operation screen for the administrator to manage the radio access network, such as a screen for setting the location information and address information of the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f.
  • the input processing unit 25 is connected to the input device 29.
  • the input device 29 for example, a keyboard, a mouse, a touch panel, or the like can be used.
  • the input processing unit 25 detects an administrator's operation (for example, key press) on the input device 29 and outputs an input signal to the CPU 21.
  • the communication unit 26 is connected to the network 50.
  • the communication unit 26 communicates with the radio base stations 10, 10a, 10b, 10c, 10d, 10e, and 10f according to the control of the CPU 21.
  • the control message stored in the RAM 22 is output to the network 50 in a predetermined packet format.
  • a control message in a predetermined packet format is received from the network 50 and stored in the RAM 22.
  • FIG. 6 is a sequence diagram showing control at the time of installation of the radio base station. This process is executed when the radio base station 10 is added to the mobile communication system. In the following, the control flow shown in FIG. 6 will be described in order of step number.
  • Step S1 When the radio base station 10 is connected to the network 50 and turned on, the radio base station 10 transmits a control message requesting the IP addresses of the radio base station 10 and the neighboring base stations to the maintenance device 20. Note that the IP address of the maintenance device 20 is registered in advance in the radio base station 10 before the power is turned on.
  • Step S2 When the maintenance device 20 receives a control message requesting an IP address from the radio base station 10, the maintenance device 20 allocates an IP address to the radio base station 10. Further, the base stations around the radio base station 10 are searched and the IP addresses of those radio base stations are acquired. Then, the maintenance device 20 transmits a control message including the IP addresses of the radio base station 10 and neighboring base stations to the radio base station 10.
  • the surrounding base stations of the radio base station 10 can be determined based on the installation positions of the radio base stations. For example, it can be considered that a radio base station whose distance from the radio base station 10 is equal to or less than a predetermined threshold is determined as a neighboring base station. At this time, the threshold of the distance may be changed according to the communication environment such as the installation area of the radio base station 10 and the radio wave intensity. For example, it is conceivable to use a small threshold value in a metropolitan area and use a large threshold value in a local area.
  • Step S3 The radio base station 10 sends a control message requesting cell information to the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f, which are neighboring base stations, using the IP address acquired in step S2. Send.
  • the transmission order may be any order.
  • Step S4 Upon receiving a control message requesting cell information from the radio base station 10, the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f wirelessly transmit a control message including its own cell information as a response. Transmit to the base station 10.
  • the cell information to be transmitted includes position information of the subordinate cell of the own station and adjacent cell information indicating an adjacent cell of the subordinate cell.
  • Step S5 Based on the cell information acquired in Step S4, the radio base station 10 detects neighboring cells and generates neighboring cell information for each of the subordinate cells #A, #B, and #C. That is, the radio base station 10 selects neighboring cells of the cells #A, #B, and #C from the cells # 1 to # 18 that are subordinate cells of the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f. select. In the selection of neighboring cells, the neighboring relationship between existing cells is referred to.
  • the radio base station 10 transmits a control message including cell information of the radio base station 10 to at least a radio base station that manages a cell selected as an adjacent cell. For example, when at least one of the cells # 1, # 2, and # 7 is selected as an adjacent cell, a control message is transmitted to the radio base station 10a. On the other hand, when all of the cells # 14, # 15, and # 18 are not selected as neighboring cells, it is not necessary to transmit a control message to the radio base station 10f. However, a control message including the cell information of the radio base station 10 may be transmitted to all the radio base stations that have requested cell information in step S3.
  • Step S6 The radio base station (for example, the radio base station 10a) that has received the control message from the radio base station 10 in step S5 uses the cell #A, #B, The adjacency relationship between #C and the subordinate cell of the own station is specified. Then, the neighboring relationship with the cells #A, #B, and #C is registered in the neighboring cell information held by the own station. Thereafter, a control message indicating completion of updating of neighboring cell information is transmitted to the radio base station 10.
  • control messages are transmitted and received between the radio base station 10 and the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f that are neighboring base stations. Adjacent relations between the cells #A, #B, #C and the neighboring cells are established.
  • the IP address is used to identify the radio base stations 10, 10a, 10b, 10c, 10d, 10e, 10f and the maintenance device 20 in communication.
  • address information other than the IP address may be used. Is possible.
  • the radio base station 10 acquires the IP address from the maintenance device 20, but the administrator registers the IP addresses of the radio base station 10 and the neighboring base stations in advance with the radio base station 10. Also good. In that case, the radio base station 10 does not need to communicate with the maintenance device 20 after the power is turned on.
  • FIG. 7 is a diagram showing the format of the address request message.
  • the address request message 51 is a control message transmitted from the radio base station 10 to the maintenance device 20 in step S1.
  • the address request message 51 includes request source BS (Base Station) information.
  • the request source BS information is information about the source base station (that is, the radio base station 10) of the address request message 51.
  • the request source BS information includes BS-ID and location information.
  • BS-ID is an ID for identifying a transmission source base station.
  • the location information indicates the installation location of the transmission source base station, and includes longitude and latitude.
  • the location information included in the request source BS information is used by the maintenance device 20 to search for a neighboring base station of the transmission source base station. This position information is registered in advance in the transmission source base station. However, when the maintenance device 20 can identify the installation location of the transmission source base station from the BS-ID (for example, when the location information of the radio base station 10 is already registered in the maintenance device 20), the request source BS information The position information may not be included in the.
  • FIG. 8 is a diagram showing the format of the address notification message.
  • the address notification message 52 is a control message transmitted from the maintenance device 20 to the radio base station 10 in step S2.
  • the address notification message 52 includes notification destination BS information and one or more peripheral BS information (peripheral BS information # 1 to #N).
  • the notification destination BS information is information about the destination base station (that is, the radio base station 10) of the address notification message 52.
  • the notified BS information includes a BS-ID and an IP address.
  • BS-ID is an ID for identifying a destination base station.
  • the IP address is an IP address assigned by the maintenance device 20 to the destination base station. Thereafter, the destination base station can perform communication using this IP address.
  • the one or more neighboring BS information is information about the neighboring base station of the destination base station (that is, the radio base stations 10a, 10b, 10c, 10d, 10e, 10f).
  • Each neighboring BS information corresponds to one neighboring base station and includes a BS-ID and an IP address.
  • the BS-ID is an ID for identifying the neighboring base station.
  • the IP address is an IP address assigned to the peripheral base station. The destination base station can communicate with neighboring base stations using this IP address.
  • FIG. 9 is a diagram showing the format of the cell information request message.
  • the cell information request message 53 is a control message transmitted from the radio base station 10 to the neighboring base stations (that is, the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f) in step S3.
  • the cell information request message 53 includes request source BS information.
  • the request source BS information is information on the source base station (that is, the radio base station 10) of the cell information request message 53.
  • the request source BS information includes a BS-ID and an IP address.
  • BS-ID is an ID for identifying a transmission source base station.
  • the IP address is an address assigned to the transmission source base station by the maintenance device 20.
  • FIG. 10 is a diagram showing the format of the cell information notification message.
  • the cell information notification message 54 is a control message transmitted from the neighboring base stations (that is, the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f) to the radio base station 10 in step S4.
  • the cell information notification message 54 includes notification source BS information and subordinate cell information.
  • the notification source BS information is information regarding the transmission source base station of the cell information notification message 54 (that is, any one of the neighboring base stations of the radio base station 10).
  • the notification source BS information includes a BS-ID and an IP address.
  • BS-ID is an ID for identifying a transmission source base station.
  • the IP address is an IP address assigned by the maintenance device 20 to the transmission source base station.
  • the subordinate cell information is information on the subordinate cell of the transmission source base station.
  • the subordinate cell information includes the number of cells and one or more pieces of cell information (cell information # 1 to #N).
  • the number of cells is the number of subordinate cells and corresponds to the number of subsequent cell information.
  • One or more pieces of cell information are information about details of subordinate cells.
  • Each cell information corresponds to one subordinate cell and includes a cell ID, position information, and neighboring cell information.
  • the cell ID is an ID for identifying subordinate cells.
  • the position information indicates the position of the center of the subordinate cell, and includes longitude and latitude.
  • Neighboring cell information is information about neighboring cells of subordinate cells.
  • the neighbor cell information includes the number of cells and one or more pieces of cell information (cell information # 1 to #M).
  • the number of cells is the number of adjacent cells, and corresponds to the number of cell information that follows.
  • One or more pieces of cell information are information about details of neighboring cells.
  • Each cell information included in the neighboring cell information corresponds to one neighboring cell and includes a cell ID and position information.
  • the cell ID is an ID for identifying a neighboring cell.
  • the position information indicates the position of the center of the surrounding cell, and includes longitude and latitude.
  • control message transmitted from the radio base station 10 to the neighboring base station (for example, the radio base station 10a) in step S5 can be realized by the same format as the cell information notification message 54.
  • the notification source BS information is information about the radio base station 10
  • the subordinate cell information is information about the subordinate cells of the radio base station 10 (ie, cells #A, #B, #C).
  • FIG. 11 is a diagram showing the format of the update completion message.
  • the update completion message 55 is a control message transmitted from the neighboring base station (for example, the radio base station 10a) to the radio base station 10 in step S6.
  • the update completion message 55 includes notification source BS information.
  • the notification source BS is information on the transmission source base station of the update completion message 55.
  • the notification source BS information includes a BS-ID and an IP address.
  • BS-ID is an ID for identifying a transmission source base station.
  • the IP address is an IP address assigned by the maintenance device 20 to the transmission source base station.
  • FIG. 12 is a flowchart showing processing of the newly installed base station. This process is executed in the radio base station 10 when the radio base station 10 is added to the mobile communication system. In the following, the process illustrated in FIG. 12 will be described in order of step number.
  • Step S11 The control unit 16 detects that the radio base station 10 is connected to the network 50 and turned on.
  • Step S12 The control unit 16 acquires the IP address of the maintenance device 20 stored in advance from the storage unit 17.
  • the message transmission unit 15 transmits an address request message 51 to the maintenance device 20 using the IP address acquired by the control unit 16.
  • the message receiving unit 14 receives the address notification message 52 from the maintenance device 20.
  • the control unit 16 stores the IP address of the radio base station 10 and the IDs and IP addresses of the neighboring base stations included in the address notification message 52 in the storage unit 17.
  • Step S14 The message transmission unit 15 uses the IP address of the neighboring base station acquired in Step S13 to transmit cell information to each neighboring base station (ie, the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f). A request message 53 is transmitted.
  • Step S15 The message receiver 14 receives the cell information notification message 54 from any of the neighboring base stations.
  • the control unit 16 stores the subordinate cell information included in the cell information notification message 54 in the storage unit 17.
  • Step S16 The control unit 16 determines whether or not the cell information notification message 54 has been received from all neighboring base stations as a response to the cell information request message 53 transmitted in step S14. If it has been received from all neighboring base stations, the process proceeds to step S17. Otherwise, the process proceeds to step S15 and waits for the cell information notification message 54.
  • Step S17 The control unit 16 selects neighboring cells for each of the cells #A, #B, and #C subordinate to the radio base station 10, using the subordinate cell information stored in the storage unit 17 in step S15. .
  • the adjacent cell is selected from other subordinate cells of the radio base station 10 and cells # 1 to # 18 under the control of the neighboring base stations.
  • the control part 16 produces
  • Step S18 The control unit 16 extracts a radio base station that manages the adjacent cell selected in step S17 from the neighboring base stations (radio base stations 10a, 10b, 10c, 10d, 10e, 10f).
  • the message transmission unit 15 transmits the cell information of the radio base station 10 to the extracted radio base station in the same format as the cell information notification message 54.
  • This control message includes information indicating the cells #A, #B, #C and their neighboring cells.
  • Step S19 The message receiver 14 receives the update completion message 55 from any neighboring base station that is the transmission destination of the control message in Step S18.
  • Step S20 The control unit 16 determines whether or not the update completion message 55 has been received from all the neighboring base stations that are the transmission destinations of the control message in step S18. If it has been received from all neighboring base stations, the process ends. In other cases, the process proceeds to step S19 to wait for the update completion message 55.
  • the wireless base station 10 acquires the IP address of the neighboring base station from the maintenance device 20, accesses the neighboring base station, and the neighboring base station Collect retained cell information. Then, using the collected cell information of the neighboring base stations, the neighboring cells of the subordinate cells (cells #A, #B, #C) of the radio base station 10 are selected. Thereafter, the neighboring base station that manages the neighboring cell is notified of the subordinate cell of the radio base station 10, and the neighboring relationship is set to bidirectional.
  • FIG. 13 is a flowchart showing processing of a neighboring base station. This process is executed in the radio base station that has received the cell information request message 53 from the radio base station 10. Hereinafter, the process illustrated in FIG. 13 will be described along with step numbers assuming that the radio base station 10a executes the process.
  • Step S ⁇ b> 21 The message receiving unit (corresponding to the message receiving unit 14 of the radio base station 10) of the radio base station 10 a receives the cell information request message 53 from the radio base station 10.
  • the control unit (corresponding to the control unit 16 of the radio base station 10) of the radio base station 10a receives the cells # 1, # 2, # 7 and its neighboring cells from the storage unit (corresponding to the storage unit 17). Extract the information shown.
  • the message transmission unit (corresponding to the message transmission unit 15 of the radio base station 10) of the radio base station 10a transmits the cell information notification message 54 to the radio base station 10.
  • the adjacent cells of the cells #A, #B, and #C are selected based on the cell information notification message 54. In the following, it is assumed that at least one of the cells # 1, # 2, and # 7 is selected as an adjacent cell.
  • Step S23 The message receiver of the radio base station 10a receives from the radio base station 10 a control message including the cell information of the radio base station 10 (a control message having the same format as the cell information notification message 54).
  • Step S24 The control unit of the radio base station 10a updates the neighboring cell information stored in the storage unit based on the cell information received in step S23. That is, between the cells # 1, # 2, # 7 managed by the radio base station 10a and the cells #A, #B, #C managed by the radio base station 10 according to the selection result of the adjacent cell by the radio base station 10. Set the adjacency relationship.
  • Step S25 The message transmission unit of the radio base station 10a transmits the update completion message 55 to the radio base station 10.
  • the radio base station 10 a transmits the cell information currently held by the radio base station 10 a to the radio base station 10 in response to a request from the radio base station 10.
  • at least one of the subordinate cells (cells # 1, # 2, # 7) of the radio base station 10a is selected as an adjacent cell of the subordinate cells (cells #A, #B, #C) of the radio base station 10. And register the adjacency.
  • FIG. 14 is a diagram showing an example of the data structure of the candidate cell information table.
  • the candidate cell information table 17a is intermediate data created on the storage unit 17 while the radio base station 10 executes the process shown in FIG.
  • Peripheral BS information is information about the peripheral base stations (radio base stations 10a, 10b, 10c, 10d, 10e, 10f) of the radio base station 10.
  • the peripheral BS information includes a BS-ID and an IP address.
  • BS-ID is an ID for identifying each neighboring base station.
  • the IP address is an address assigned to each peripheral base station.
  • Subordinate cell information is information about subordinate cells of neighboring base stations.
  • One peripheral base station is associated with one or more subordinate cells (three subordinate cells in the case of the configuration in FIG. 3).
  • the subordinate cell information includes a cell ID and position information.
  • the cell ID is an ID for identifying each subordinate cell.
  • Position information indicates the position of the center of the subordinate cell, including latitude and longitude.
  • Neighboring cell information is information on neighboring cells with respect to cells under the control of neighboring base stations. One or more neighboring cells are associated with one subordinate cell.
  • the neighbor cell information includes a cell ID and position information.
  • the cell ID is an ID for identifying each adjacent cell.
  • Position information indicates the position of the centers of adjacent cells, including latitude and longitude.
  • the neighboring BS information is registered in the candidate cell information table 17a when the radio base station 10 receives the address notification message 52 from the maintenance device 20 in step S13.
  • the subordinate cell information and the neighboring cell information are registered when the radio base station 10 receives the cell information notification message 54 from the neighboring base station in step S15.
  • the ID and location information of the cells # 1, # 2, and # 7 are registered in association with the ID and IP address of the radio base station 10a.
  • cells # 2 and # 7 are adjacent cells of cell # 1
  • the IDs and location information of cells # 2 and # 7 are registered in association with the ID and location information of cell # 1.
  • FIG. 15 is a flowchart showing the neighbor cell selection process. This processing is executed by the radio base station 10 in step S17. In the following, the process illustrated in FIG. 15 will be described in order of step number.
  • Step S171 The control unit 16 selects one cell (reference cell) for generating neighboring cell information from the subordinate cells (cells #A, #B, #C) of the radio base station 10. Thereafter, the processes of steps S172 to S174 are executed for each cell other than the selected reference cell, that is, each of the other subordinate cells of the radio base station 10 and the subordinate cells of the neighboring base stations. For example, when cell #B is selected, cells #A and #C and cells # 1 to # 18 are processed.
  • Step S172 The control unit 16 calculates the distance between the reference cell selected in Step S171 and the target other cell (the distance between the cell centers) from the position information of the two cells.
  • the position information of the target other cell is registered in the subordinate cell information in the candidate cell information table 17a.
  • the position information of the reference cell is registered in the radio base station 10 in advance. However, the location information of the subordinate cell of the radio base station 10 may be acquired from the maintenance device 20.
  • Step S173 The control unit 16 determines whether or not the inter-cell distance calculated in step S172 is equal to or less than a predetermined threshold T1.
  • the threshold T1 may be determined in consideration of the radio wave arrival radius of the reference cell selected in step S171. If the inter-cell distance is equal to or less than the threshold value T1, the process proceeds to step S174. If the distance between the cell exceeds the threshold value T1, to process the next another cell returns to step S172. However, it advances if the following other cells do not exist, the processing terminates the loop to step S175.
  • Step S174 the control unit 16, the other cells of the subject, is designated as the primary candidate cell. Then, the process returns to step S172 to process the next other cell. However, it advances if the following other cells do not exist, the processing terminates the loop to step S175.
  • FIG. 16 is a flowchart (continuation) illustrating the neighbor cell selection process.
  • the control unit 16 searches for neighboring cell information in the candidate cell information table 17a, and identifies the neighboring cell of the primary candidate cell specified in step S174. And the cell which is not designated as the primary candidate cell among the specified cells, that is, the cell which is adjacent to the primary candidate cell and whose distance from the reference cell exceeds the threshold T1 is designated as the secondary candidate cell.
  • the processes of steps S176 to S178 are executed for each of the primary candidate cell and the secondary candidate cell (both are collectively referred to as candidate cells).
  • Step S176 For the target candidate cell, the control unit 16 calculates the number of primary candidate cells (referenced number) referring to the candidate cell. If the candidate cell of interest is a primary candidate cell, the reference component from the own cell are also counted. In other words, the number of referenced refers to the number of primary candidate cells adjacent to the candidate cell when the target candidate cell is a secondary candidate cell. When the target candidate cell is a primary candidate cell, it means the number obtained by adding 1 to the number of other primary candidate cells adjacent to the candidate cell.
  • Step S177 The control unit 16 determines whether or not the number of references calculated in step S176 is equal to or greater than a predetermined threshold T2. If referenced number is not less than the threshold value T2, the process proceeds to step S178. If referenced number is less than the threshold value T2, to process the next candidate cell returns to step S176. However, if there is no next candidate cell, the loop is terminated and the process proceeds to step S179.
  • Step S178 The control unit 16 designates the target candidate cell as an adjacent cell of the reference cell selected in Step S171, and registers information indicating the designated adjacent cell in the storage unit 17. Then, the process returns to step S176 to process the next candidate cell. However, if there is no next candidate cell, the loop is terminated and the process proceeds to step S179.
  • Step S179 The control unit 16 determines whether or not all subordinate cells of the radio base station 10 have been selected in step S171. If all subordinate cells have been selected, the process ends. Otherwise, the process returns to step S171 to select the next subordinate cell.
  • the radio base station 10 selects neighboring cells of the subordinate cells (cells #A, #B, #C) using the cell information collected from the neighboring base stations. That is, a cell within a certain distance from the reference subordinate cell is designated as a candidate cell (primary candidate cell), and a cell adjacent to the primary candidate cell is designated as a candidate cell (secondary candidate cell). Then, a candidate cell that has many references from the primary candidate cell is selected as an adjacent cell of the reference subordinate cell, assuming that the cell is closely linked to the surrounding cells.
  • the above detailed processing method is an example of a neighbor cell selection method, and various modifications are possible.
  • the reference from the own cell may not be counted even when the target candidate cell is the primary candidate cell. References from the next candidate cell may be counted. Further, a cell adjacent to the primary candidate cell (secondary candidate cell) may not be designated as a candidate cell.
  • FIG. 17 is a first diagram illustrating an example of a procedure for selecting an adjacent cell.
  • a cell adjacent to cell #B is selected.
  • surrounding cells whose distance from the cell #B is equal to or less than a threshold T1 are designated as primary candidate cells.
  • cells #A, C which are subordinate cells of the radio base station 10 and cells # 8, # 9, # 13, # 16 which are subordinate cells of the neighboring base stations are designated as primary candidate cells.
  • FIG. 18 is a second diagram illustrating an example of a procedure for selecting an adjacent cell.
  • the table 17b is a table created on the storage unit 17 when the control unit 16 of the radio base station 10 executes steps S174 and S175.
  • the table 17b includes items of a primary candidate cell, an adjacent cell (primary candidate), and an adjacent (secondary candidate). Information arranged in the horizontal direction is associated with each other.
  • ID of the designated cell in Step S174 it is registered.
  • cells #A, #C, # 8, # 9, # 13, and # 16 are registered.
  • the ID of another primary candidate cell adjacent to the primary candidate cell specified in step S174 is registered.
  • cells # 8 and # 13 are registered for cell # 9.
  • the ID of the secondary candidate cell adjacent to the primary candidate cell specified in step S174 is registered.
  • cells # 3, # 4, and # 10 are registered for cell # 9.
  • cell #C is registered as an adjacent cell for cell #A. This is because the cells #A and #C are both subordinate cells of the radio base station 10, and the cell #C is already recognized as an adjacent cell of the cell #A. On the other hand, cell #C is not registered as the adjacent cell to the cell # 16. This is because the cell #C has not yet been recognized as a neighboring cell of the cell # 16.
  • the table 17b may be created by excluding the adjacent relationship between the cells #A, #B, and #C.
  • cell #B which is a reference subordinate cell, is also registered in the table 17b as one of candidate cells. However, the table 17b may be created by excluding the cell #B.
  • FIG. 19 is a third diagram illustrating an example of a procedure for selecting an adjacent cell.
  • the table 17c is a table created on the storage unit 17 when the control unit 16 of the radio base station 10 executes step S176.
  • items of candidate cells and the number of referenced are provided in the table 17c.
  • Information arranged in the horizontal direction is associated with each other.
  • the ID of the candidate cell (including both the primary candidate cell and the secondary candidate cell) is registered.
  • cells #A, #B, #C, # 2, # 3, # 4, # 7, # 8, # 9, # 10, # 13, # 14, # 16, and # 17 are registered.
  • the cell #B which is the reference subordinate cell may be excluded from the table 17c.
  • the referenced number calculated in step S176 is registered.
  • the candidate cell whose reference count registered in the table 17c is equal to or greater than the threshold T2 is selected as the neighbor of the cell #B.
  • threshold value T2 2 is set, cells #A, #C, # 3, # 7, # 8, # 9, # 10, # 13, # 16, and # 17 are selected as neighboring cells.
  • the threshold value T2 may be variable according to the communication environment such as the installation area of the radio base station 10.
  • the radio base station 10 can select the neighboring cells of the subordinate cells (cells #A, #B, #C). At that time, the existing adjacency relationship between the neighboring cells is referred to and selection is performed. In the examples of FIGS. 17 to 19, all the cells #A, #C, # 8, # 9, # 13, and # 16 within a certain distance from the cell #B are selected as neighboring cells. It is also conceivable that a part of is not selected as an adjacent cell.
  • cell # 9 is excluded from the adjacent cells of cell #B. This is because it is considered that the cell #B cannot establish an adjacency relationship with the cell # 9, that is, there is a high possibility that the cell #B cannot be handed over to the cell # 9. In this way, by referring to the existing adjacent relationship between the neighboring cells, neighboring cells that are not preferable as neighboring cells can be excluded.
  • a cell (secondary candidate cell) that is separated from the reference subordinate cell by a certain distance or more but is adjacent to any primary candidate cell may be selected as the adjacent cell. This is because when there is a judgment based only on the distance between the centers of the cells, there is a cell that is excluded from the candidates even though there is a possibility that handover can be performed from the reference subordinate cell.
  • the cells # 3, # 7, # 10, and # 17 are not designated as primary candidate cells because the center-to-center distance is more than a certain distance from the cell #B. However, since some of the areas of the cells # 3, # 7, # 10, and # 17 are within a certain distance from the cell #B, the handover from the cell #B to the cells # 3, # 7, # 10, and # 17 is performed. There is a possibility. In the example of FIG. 19, cells # 3, # 7, # 10, and # 17 are also selected as cells adjacent to cell #B.
  • cell #B it is possible to select an adjacent cell of cell #B without considering secondary candidate cells such as cells # 3, # 7, # 10, and # 17. That is, only cells #A, #C, # 8, # 9, # 13, and # 16 within a certain distance from the cell #B may be designated as candidate cells. In this case, it is possible to narrow down to cells that are more preferable as neighboring cells, that is, cells that are more likely to be handed over from cell #B.
  • FIG. 20 shows an example of the data structure of the cell information table.
  • the cell information table 17d is a table that is finally created on the storage unit 17 when the radio base station 10 executes the process shown in FIG.
  • the cell information table 17d includes BS information, subordinate cell information, and neighboring cell information.
  • Cell information is configured by associating BS information, subordinate cell information and neighboring cell information arranged in the horizontal direction.
  • BS information is information about the radio base station 10 and neighboring base stations that manage neighboring cells (that is, the radio base stations 10a, 10b, 10c, and 10e).
  • BS information includes BS-ID, classification, and IP address.
  • BS-ID is an ID for identifying each radio base station. The division indicates whether it is its own station (wireless base station 10) or a neighboring base station.
  • the IP address is an address assigned to each radio base station. Items included in the subordinate cell information and the neighboring cell information are the same as those in the candidate cell information table 17a shown in FIG.
  • the neighboring cell information of the radio base station 10 can be created by executing the process shown in FIG. In step S5, the cell information of the radio base station 10 among the cell information included in the cell information table 17d is transmitted to the neighboring base stations.
  • the cell information table 17d also includes cell information about neighboring base stations that manage the neighboring cells of the cells #A, #B, and #C.
  • Cell information of neighboring base stations can be created with reference to the candidate cell information table 17a shown in FIG. However, the neighbor relationship with the cells #A, #B, and #C is newly registered in the neighbor cell information of the neighboring base stations.
  • the radio base stations 10a, 10b, 10c, 10d, 10e, and 10f also hold the same table as the cell information table 17d.
  • the cell information notification message 54 may be created by extracting the cell information of the own station from the table held by each radio base station.
  • the cell information of the radio base station 10 is registered in the table held by each radio base station, and the adjacency relationship with the cells #A, #B, and #C is registered in the adjacent cell information of the own station. do it.
  • the burden of generating / updating neighboring cell information associated with the new establishment of the radio base station 10 is reduced. That is, since the radio base station 10 automatically communicates with neighboring base stations to generate / update neighboring cell information when newly established, the investigator moves within the areas of the cells #A, #B, #C. It is not necessary to measure the reception level of the radio signal, and the work load on the investigator is suppressed. Moreover, the influence which the production
  • a preferable cell as a neighbor cell of the cells #A, #B, and #C from the cells # 1 to # 18 managed by the neighboring base stations. That is, by estimating neighboring cells that are difficult to be handed over due to the influence of buildings, topography, and the like from existing neighboring relationships, it is possible to appropriately narrow down neighboring cells. In this way, by narrowing down the neighboring cells, for example, the processing load of the mobile station 30 measuring the reception level of the neighboring cell can be reduced, and the power consumption can be suppressed.
  • the neighboring cells that can be handed over are neighboring cells. It can suppress that it is excluded from.
  • the neighbor cell selection in the case where the radio base station 10 is newly established has been described, but this process can also be applied to the case where a subordinate cell is added to an existing radio base station.
  • the radio base station 10 may perform the above adjacent cell selection for the cell #D.
  • the above neighboring cell selection may be performed regularly or irregularly.
  • Radio base station 1a Receiver 1b Controller 4a, 4b, 4c, 4d Cell 5a, 5b Neighbor cell information

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Abstract

L'invention concerne un système de communications sans fil qui détecte de manière appropriée une cellule jouxtant une certaine cellule. Une station de base sans fil (1) comprend une unité de réception (1a) et une unité de commande (1b). L'unité de réception (1a) reçoit des informations de cellules (5a, 5b) sur plusieurs premières cellules (4a, 4b, 4c) provenant d'autres stations de base sans fil (2, 3). Sur la base de la relation d'adjacence parmi les nombreuses premières cellules (4a, 4b, 4c) indiquées par les informations de cellules adjacentes reçues (5a, 5b), l'unité de commande (1b) détecte dans les nombreuses premières cellules (4a, 4b, 4c), les cellules qui jouxtent une seconde cellule (4d) gérée par la station de base sans fil.
PCT/JP2009/070172 2009-12-01 2009-12-01 Station de base sans fil, procede de commande de communications, et systeme de communications sans fil WO2011067824A1 (fr)

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PCT/JP2009/070172 WO2011067824A1 (fr) 2009-12-01 2009-12-01 Station de base sans fil, procede de commande de communications, et systeme de communications sans fil

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WO2011067824A1 true WO2011067824A1 (fr) 2011-06-09

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017041905A (ja) * 2016-10-13 2017-02-23 インテル コーポレイション Ａｐ位置クエリ
US10524223B2 (en) 2013-09-20 2019-12-31 Intel Corporation Location configuration information (LCI) query

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007312037A (ja) * 2006-05-17 2007-11-29 Ntt Docomo Inc 基地局、制御局、及び通信方法
JP2008124576A (ja) * 2006-11-08 2008-05-29 Ntt Docomo Inc 基地局及び通信方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007312037A (ja) * 2006-05-17 2007-11-29 Ntt Docomo Inc 基地局、制御局、及び通信方法
JP2008124576A (ja) * 2006-11-08 2008-05-29 Ntt Docomo Inc 基地局及び通信方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10524223B2 (en) 2013-09-20 2019-12-31 Intel Corporation Location configuration information (LCI) query
JP2017041905A (ja) * 2016-10-13 2017-02-23 インテル コーポレイション Ａｐ位置クエリ

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