JP5591872B2 - Communication management system - Google Patents

Description

  The present invention relates to a communication management system and an integrated management server that centrally manage parameters of a plurality of base stations.

  Conventionally, a communication management system using a function called SON (Self Organizing Network) that automates the installation and operation of a base station has been proposed in order to reduce the load of installation and operation of a base station in mobile communication (for example, Patent Documents 1 and 2). In this communication management system, a management server (hereinafter referred to as “SON server”) for managing parameters of a plurality of base stations is installed on the core network side, and management of parameter setting, optimization, restoration, etc. of each base station is performed. It can be performed.

  In particular, in order to cope with the rapid increase in traffic in recent years, there is an increasing demand for small base stations having a smaller cell radius than conventional macro base stations and pico base stations. Since a small base station has a small cell radius and needs to be deployed in multiple stations, there is a problem that the load of installing and operating the base station increases. The SON is considered effective as a technique for solving this problem.

  However, the base stations that are subject to parameter management in the SON are provided by multiple types of providers (vendors), and the base station optimization method and interface specifications for accessing the base stations are provided. Each original has its own specifications. Therefore, an independent SON server is provided for each base station provider. Each SON server can manage parameters only for base stations of the same providing source under the SON server, but cannot manage parameters of other base stations with different providing sources. Therefore, in a communication management system equipped with a conventional SON server, for a boundary area where cells of a plurality of base stations with different providers are adjacent to each other, the parameters of each of the plurality of base stations are managed by a plurality of SONs. The servers perform the operations independently of each other, and the management of parameter setting, optimization, restoration, and the like cannot be appropriately performed for each base station. For example, when a mobile device (mobile station) is located in a boundary area where the cells of the plurality of base stations are adjacent to each other, duplicate values as cell identification parameters (PCI: Physical Cell Identify) of each base station May be set. Thus, if the setting of the cell identification parameter is inappropriate, the mobile device cannot determine to which of the cells of the plurality of base stations it belongs.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication management system and an integrated management server that can appropriately manage parameters of a plurality of base stations with different providers. is there.

The present invention is a communication management system comprising an independent management server for managing parameters of a plurality of base stations belonging to a base station group for each of a plurality of base station groups from which base station providers are different from each other. An integrated management server capable of communicating with each of the independent management servers, wherein the integrated management server includes parameter value determining means for determining parameter values that can be set for each of the plurality of base stations belonging to the plurality of base station groups, Transmission means for transmitting the parameter value determined by the parameter value determining means to the independent management server of the base station group to which the parameter setting target base station belongs, the previous independent management server from the integrated management server Instructing the parameter setting target base station to set the parameter based on the received parameter value It is an feature.
In this communication management system, an integrated management server that can communicate with a plurality of independent management servers determines parameter values that can be set for a plurality of base stations that belong to a plurality of base station groups. As a result, even if the providers of the plurality of base stations under the control of the plurality of independent management servers are different from each other, the integrated management server adjusts the parameters set for the plurality of base stations and performs centralized management. be able to. Then, the integrated management server transmits the determined parameter value to the independent management server of the base station group to which the parameter setting target base station belongs. The independent management server directs parameter setting to the parameter setting target base station based on the parameter value received from the integrated management server, so that the base station is centrally managed by the integrated management server. Parameter value is set. As described above, even when the providers of the plurality of base stations under the control of the plurality of independent management servers are different from each other, centralized management can be performed by adjusting the parameters set in the plurality of base stations. At the same time, parameter values centrally managed by the integrated management server are set in the base station. Therefore, it is possible to appropriately manage parameters of a plurality of base stations with different providers.
In the communication management system, the integrated management server further includes information acquisition means for acquiring information on all or some of the base stations belonging to the plurality of base station groups, and the parameter value determining means of the integrated management server May determine an optimum value of a parameter to be set in the base station based on the information on the base station acquired by the information acquisition unit. In this communication management system, it is possible to intensively grasp the state of a plurality of base stations belonging to a plurality of base station groups, and to set optimal values of parameters determined according to the state of the base station in the base station. .
Further, in the communication management system, each of the plurality of independent management servers is provided for each of a plurality of base station groups having different macro base station providers, and the macro base station parameters and the macro base station cell It is also possible to manage parameters of small base stations located in the area. In this communication management system, it is possible to appropriately manage parameters of a plurality of macro base stations and small base stations with different providers. In particular, in this communication management system, the management of the parameters of the small base station located in the cell of the macro base station is managed by the independent management server of the base station group to which the macro base station belongs. There is no need to set up a base station group or provide an independent management server for each.
In the communication management system, the plurality of independent management servers are provided for each of a plurality of base station groups having different macro base station providers, and are dedicated to a plurality of macro base stations that manage parameters of the macro base station. And an independent management server dedicated to a small base station that is provided in a base station group to which only a plurality of small base stations belong and manages the parameters of the small base station. In this communication management system, it is possible to appropriately manage parameters of a plurality of macro base stations and small base stations with different providers. In particular, in this communication management system, since an independent management server dedicated to small base stations is provided in a base station group to which only a plurality of small base stations belong, centralized management of parameters of the small base stations is facilitated and small size There is no need to set up a base station group or provide an independent management server for each base station provider.
In the communication management system, the parameter managed by the integrated management server may be a parameter in which different values are set so as not to overlap between a plurality of adjacent base stations. In this communication management system, when a plurality of base stations with different providers are adjacent to each other, parameters in each base station can be set so that values do not overlap between the base stations.
Further, in the communication management system, the parameter value determining means of the integrated management server determines a range of parameter candidate values that can be assigned to a plurality of base stations belonging to the plurality of base station groups between the independent management servers. The transmission unit of the integrated management server transmits a range of parameter candidate values to the plurality of independent management servers of each of the plurality of base station groups, and the plurality of independent management servers respectively Based on the range of candidate values of the parameter received from the integrated management server, the setting of the parameter may be instructed to the base station under the independent management server. In this communication management system, when a plurality of base stations with different providers are adjacent to each other, parameter values can be prevented from overlapping between the base stations.
In the communication management system, the parameter managed by the integrated management server may be a parameter in which the same value is set between a plurality of adjacent base stations. In this communication management system, when a plurality of base stations with different providers are adjacent to each other, parameters can be set so that the values are the same between the base stations.
In the communication management system, the information acquisition unit of the integrated management server acquires information managed by a base station via the independent management server, and the parameter value determination unit of the integrated management server includes the base station The parameter value set in the base station is determined based on the information managed by the base station, and the transmission unit of the integrated management server sends the parameter value determined by the parameter value determination unit to the independent management server to which the base station belongs. The independent management server may instruct the base station to set the parameter based on the parameter value received from the integrated management server. In this communication management system, the parameters in each base station can be set to appropriate values based on the information managed by each base station.

An integrated management server according to the present invention is an integrated management server capable of communicating with an independent management server that manages parameters of a plurality of base stations belonging to the base station group for each of a plurality of base station groups with different base station providers. A parameter value determining unit that determines a parameter value that can be set for each of the plurality of base stations that belong to the plurality of base station groups, and the parameter value determined by the parameter value determining unit Transmitting means for transmitting to the independent management server of the base station group to which the station belongs.
In this integrated management server, parameter values that can be set for a plurality of base stations belonging to a plurality of base station groups are determined. Thereby, even when the providers of the plurality of base stations under the control of the plurality of independent management servers are different from each other, centralized management can be performed by adjusting the parameters set in the plurality of base stations. Then, the determined parameter value is transmitted to the independent management server of the base station group to which the parameter setting target base station belongs. The independent management server directs parameter setting to the parameter setting target base station based on the parameter value received from the integrated management server, so that the base station is centrally managed by the integrated management server. Parameter values can be set. As described above, even when the providers of the plurality of base stations under the control of the plurality of independent management servers are different from each other, centralized management can be performed by adjusting the parameters set in the plurality of base stations. At the same time, parameter values centrally managed by the integrated management server are set in the base station. Therefore, it is possible to appropriately manage parameters of a plurality of base stations with different providers.
The integrated management server further includes information acquisition means for acquiring information on all or some of the base stations belonging to the plurality of base station groups, and the parameter value determination means includes the base acquired by the information acquisition means. Based on the information of the station, the optimum value of the parameter set in the base station may be determined. In this integrated management server, the state of a plurality of base stations belonging to a plurality of base station groups can be intensively grasped, and the optimum value of a parameter determined according to the state of the base station can be set in the base station. .
Further, in the integrated management server, each of the plurality of independent management servers is provided for each of a plurality of base station groups having different macro base station providers, and the macro base station parameters and the macro base station cell It is also possible to manage parameters of small base stations located in the area. With this integrated management server, it is possible to appropriately manage the parameters of a plurality of macro base stations and small base stations with different providers. In particular, in this integrated management server, the management of the parameters of the small base station located in the cell of the macro base station is managed by the independent management server of the base station group to which the macro base station belongs. There is no need to set up a base station group or provide an independent management server for each.
In the integrated management server, the plurality of independent management servers are provided for each of a plurality of base station groups having different macro base station providers, and are dedicated to a plurality of macro base stations that manage parameters of the macro base station. And an independent management server dedicated to a small base station that is provided in a base station group to which only a plurality of small base stations belong and manages the parameters of the small base station. With this integrated management server, it is possible to appropriately manage the parameters of a plurality of macro base stations and small base stations with different providers. In particular, in this integrated management server, an independent management server dedicated to small base stations is provided in a base station group to which only a plurality of small base stations belong. There is no need to set up a base station group or provide an independent management server for each base station provider.
In the integrated management server, the parameters managed by the integrated management server may be parameters in which different values are set so as not to overlap between a plurality of adjacent base stations. In this integrated management server, when a plurality of base stations with different providers are adjacent to each other, parameters in each base station can be set so that values do not overlap between the base stations.
Further, in the integrated management server, the parameter value determining means may prevent ranges of parameter candidate values that can be assigned to a plurality of base stations belonging to the plurality of base station groups from overlapping among the independent management servers. The transmitting unit may transmit the range of candidate values of the parameter to a plurality of independent management servers in each of the plurality of base station groups. In this case, each of the plurality of independent management servers instructs the setting of the parameter to the base station subordinate to the independent management server based on the range of candidate values of the parameter received from the integrated management server. Can do. In this integrated management server, when a plurality of base stations having different providers are adjacent to each other, parameter values can be prevented from overlapping between the base stations.
In the integrated management server, the parameter managed by the integrated management server may be a parameter in which the same value is set between a plurality of adjacent base stations. In this integrated management server, when a plurality of base stations with different providers are adjacent to each other, parameters can be set so that the values are the same between the base stations.
Further, in the integrated management server, the information acquisition means acquires information managed by a base station via the independent management server, and the parameter value determination means is based on the information managed by the base station, The parameter value set in the base station may be determined, and the transmission unit may transmit the parameter value determined by the parameter value determination unit to the independent management server to which the base station belongs. In this case, the independent management server can instruct the base station to set the parameter based on the parameter value received from the integrated management server. In this integrated management server, parameters at each base station can be set to appropriate values based on information managed by each base station.

  ADVANTAGE OF THE INVENTION According to this invention, the parameter of the several base station from which a provider differs mutually can be managed appropriately.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the example of whole structure of the communication management system which concerns on one Embodiment of this invention. (A), (b) and (c) are functional block diagrams showing schematic configuration examples of an integrated SON server, an independent SON server, and a base station, respectively, in the communication management system. The flowchart which shows an example of the parameter management in the communication management system. Explanatory drawing which shows the example of whole structure of the communication management system which concerns on other embodiment of this invention. (A), (b) and (c) are functional block diagrams showing schematic configuration examples of an integrated SON server, an independent SON server, and a base station, respectively, in the communication management system. The flowchart which shows an example of the parameter management in the communication management system. Explanatory drawing which shows the example of whole structure of the communication management system which concerns on further another embodiment of this invention. (A), (b) and (c) are functional block diagrams showing schematic configuration examples of an integrated SON server, an independent SON server, and a base station, respectively, in the communication management system. The flowchart which shows an example of the parameter management in the communication management system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1
FIG. 1 is an explanatory diagram showing an example of the overall configuration of a communication management system according to an embodiment of the present invention. The communication management system according to the present embodiment includes a plurality of base station groups that belong to a plurality of base station groups having different providers (hereinafter referred to as “vendors”) A, B, and C of the macro base stations 30A, 30B, and 30C. Independent management servers 20A, 20B, and 20C for managing the parameters of the macro base stations 30A, 30B, and 30C. The plurality of independent management servers 20A, 20B, and 20C are provided, for example, in a core network of a mobile communication network. Each of the independent management servers 20A, 20B, and 20C has a function called SON (Self Organizing Network) that automates the installation and operation of base stations under the same provider, and is hereinafter referred to as an “independent SON server”. . The SON functions provided in the independent SON servers 20A, 20B, and 20C include a function for automatically setting parameters at the start of base station operation (Self Configuration), a function for automatically optimizing parameters during operation (Self Optimization), and a failure occurrence Function for automatic restoration (Self Healing), function for avoiding interference between cells (ICIC: Inter-Cell Interference Coordination), function for automatically updating neighboring base station information (ANR: Automatic Neighbor Relation), and optimization of handover parameters (MRO: Mobility Robustness Optimization) and the like.

  Note that alphabets “A”, “B”, and “C” at the end of the codes of the independent SON servers 20A, 20B, and 20C in FIG. 1 are symbols for identifying vendors. The same applies to the codes of the macro base stations 30A, 30B, and 30C and the codes of the small base stations and cells described later. In addition, each of the independent SON servers 20A, 20B, and 20C is subordinate to a plurality of macro base stations that are parameter management targets belonging to the same base station group. However, in FIG. It is illustrated that only one macro base station is located under each of 20A, 20B, and 20C.

The macro base stations 30A, 30B, and 30C are wide-area base stations that cover a macro cell that is a wide area having a radius of about several hundreds to several kilometers that is installed outdoors in a mobile communication network. Station "," Macro e-Node B "," MeNB ", etc.
The independent SON servers 20A, 20B, and 20C and the subordinate macro base stations 30A, 30B, and 30C are connected by, for example, a wired communication line, and can communicate with each other through a predetermined communication interface. Each of the macro base stations 30A, 30B, and 30C is connected to the core network of the mobile communication network via a line termination device and a dedicated line, and is connected to the corresponding independent SON servers 20A, 20B, and 20C by a predetermined communication interface. Communication is possible.

  The independent SON servers 20A, 20B, and 20C are small base stations 35A, 35C, 35D installed in the macro cells 300A, 300B, and 300C, which are wireless communication areas of the subordinate macro base stations 30A, 30B, and 30C, respectively. It also manages 35E parameters. A small base station, unlike a macro base station in a wide area, has a wireless communicable distance of several meters to several hundred meters, and can be installed indoors such as ordinary homes, shops, offices, etc. Station. Since the small base station is provided so as to cover an area smaller than the area covered by the wide-area macro base station in the mobile communication network, it is called “femto base station”, “Home e-Node B” or “ Sometimes called “Home eNB”. The small base stations 35A, 35C, 35D, and 35E are also connected to the core network of the mobile communication network via a line termination device and a broadband public communication line such as an ADSL (Asymmetric Digital Subscriber Line) line or an optical line. Communication is possible with the corresponding independent SON servers 20A, 20B, and 20C via a predetermined communication interface.

  In addition, since the cells 350A, 350C, 350D, and 350E, which are wireless communication areas of the small base stations 35A, 35C, 35D, and 35E, respectively overlap with the macro cell in which the small base station is installed, the macro base station It is conceivable that parameters are centrally managed by the same independent SON server for the small base stations located in the vicinity thereof. Therefore, in this embodiment, the vendor of the small base station does not necessarily match the vendor of the independent SON server that manages the parameters of the small base station. That is, an independent SON server is a parameter management target if it is a small base station arranged in the corresponding macro cell, regardless of whether the vendor of the small base station is the same as its own vendor or not. ing. For example, the independent SON server 20A of the vendor A manages parameters not only for the small base station 35A of the same vendor A but also for the small base stations 35C of other vendors C. Further, the independent SON server 20B of the vendor B manages parameters for the small base stations 35D and 35E of the other vendors D and E.

  When a user equipment (UE) used by a user is located in a macro cell 300A, 300B, 300C or a cell 350A, 350C, 350D, 350E, a macro corresponding to the cell in which the user equipment (UE) is located. Wireless communication can be performed with a base station or a small base station using a predetermined communication method and resources.

  The communication management system of the present embodiment further includes an integrated SON server 10 as an integrated management server that can communicate with each of the plurality of independent SON servers 20A, 20B, and 20C. The integrated SON server 10 and the independent SON servers 20A, 20B, and 20C are also connected by, for example, a wired communication line, and can communicate with each other through a predetermined communication interface. The integrated SON server 10 passes through the independent SON servers 20A, 20B, and 20C, parameters of all base stations under the control of each independent SON server (for example, PCI, PUCCH, number of PRBs, and HO offset described later) The SON operation policy can be centrally managed.

  Although FIG. 1 shows the case where three independent SON servers 20A, 20B, and 20C are connected to the integrated SON server 10, two independent SON servers can be connected to the integrated SON server 10. It may be four or more.

  2A, 2B, and 2C are respectively an integrated SON server 10, an independent SON server 20 (20A, 20B, and 20C) and a base station 30 (30A, 30B, 30C, and so on) in the communication management system of FIG. 35A, 35C, 35D, 35E) is a functional block diagram illustrating a schematic configuration example of a main part. The integrated SON server 10 and the independent SON server 20 are configured by using hardware such as a computer device having a CPU and a memory, an external communication interface device for a core network, and the like, which will be described later. Various processes such as parameter management can be executed. The base station 30 is configured using hardware such as a computer device having a CPU, a memory, etc., an external communication interface unit for the core network, a wireless communication unit, and the like. Various processes such as management can be executed, and wireless communication with a mobile device can be performed.

In FIG. 2A, the integrated SON server 10 includes a control unit 101 and a parameter transmission unit 102.
The control unit 101 controls each unit and determines parameter values that can be set for each of the plurality of base stations 30A, 30B, 30C, 35A, 35C, 35D, and 35E belonging to a plurality of base station groups. Function as. Taking the above PCI as an example of a parameter, the control unit 101 determines a range of PCI candidate values that can be assigned to a plurality of base stations belonging to a plurality of base station groups of a plurality of vendors A, B, and C. The independent SON servers 20A, 20B, and 20C are determined so as not to overlap.

  PCI is an identification number assigned to each base station, and is used, for example, for generation of various sequences (such as scrambling codes) and frequency allocation of reference signals (CRS: Cell-specific Reference Signal).

  The parameter transmission unit 102 functions as a transmission unit that transmits the parameter value determined by the control unit 101 to the independent SON servers 20A, 20B, and 20C of the base station group to which the parameter setting target base station belongs. More specifically, the parameter transmission unit 102 transmits the PCI candidate value range (PCI candidate table) determined by the control unit 101 to the plurality of independent SON servers 20A, 20B, and 20C of each of the plurality of base station groups. To do.

2B, the independent SON server 20 includes a parameter reception unit 201, a parameter management unit 202, a parameter transmission unit 203, and a base station management unit 204.
The parameter receiving unit 201 receives the PCI candidate value range (PCI candidate table) determined by the integrated SON server 10 from the integrated SON server 10.
The parameter management unit 202 determines the PCI value to be set in the subordinate base station based on the PCI candidate value range (PCI candidate table) received from the integrated SON server 10.
The parameter transmission unit 203 transmits the PCI value determined by the parameter management unit 202 to the parameter setting target base station.
The base station management unit 204 manages the state of subordinate base stations.

2C, the base station 30 includes a parameter receiver 301, a controller 302, and a scrambling code generator 303. Further, the base station 30 includes an SCH (Synchronization Channel) generation unit 304, a CRS (Cell-specific Reference Signal) generation unit 305, a PDSCH (Physical Downlink Shared Channel) generation unit 306, an OFDM (Orthogonal Frequency Division Multiplexing) modulation unit 307, And an RF unit 308.
The parameter receiving unit 301 receives the PCI value determined by the higher independent SON server 20 from the independent SON server 20.
The control unit 302 controls each unit and sets (updates) the PCI value received from the independent SON server 20.
The scrambling code generation unit 303 generates a scrambling code used by the PDSCH generation unit 306.
SCH generation section 304 generates an SCH (synchronization channel) signal used by the mobile device for cell search.
The CRS generator 305 generates a CRS (reference signal) to be transmitted to the mobile device.
PDSCH generation section 306 generates a PDSCH (physical downlink channel) signal used for data transmission to the mobile device.
The OFDM modulation unit 307 modulates various baseband transmission signals using an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
The RF unit 308 converts the baseband signal generated by modulation by the OFDM modulation unit 307 into a high frequency signal, amplifies it, and sends it to the antenna.

FIG. 3 is a flowchart showing an example of parameter management in the communication management system of FIG. FIG. 3 shows that the integrated SON server 10 performs PCI of each base station (macro base stations 30A, 30B, 30C and small base stations 35A, 35C, 35D, 35E) via a plurality of independent SON servers 20A, 20B, 20C. This is an example of centralized management.
In FIG. 3, first, the integrated SON server 10 determines a range of PCI candidate values that can be assigned to the independent SON servers 20A, 20B, and 20C (step 101). The range of PCI candidate values is determined, for example, as in the following (1) to (3).
(1) PCI candidate values assigned to the independent SON server 20A: 0 to 99
(2) PCI candidate values assigned to independent SON server 20B: 100-199
(3) PCI candidate values assigned to the independent SON server 20C: 200 to 299

  Next, the integrated SON server 10 distributes a PCI candidate table indicating the range of PCI candidate values to each independent SON server 20A, 20B, 20C (step 102).

Next, each independent SON server 20A, 20B, 20C is assigned to each of the subordinate macro base stations 30A, 30B, 30C and small base stations 35A, 35C, 35D, 35E based on the PCI candidate table received from the integrated SON server 10. The PCI value to be assigned is determined (step 103).
For example, the independent SON server 20C of the vendor C has a range of PCI candidate values received from the integrated SON server 10 in the range of 200 to 299, and therefore determines “200” as the PCI to be allocated to the subordinate macro base station 30C. “204” is determined as the PCI to be allocated to the base station 35C, and “259” is determined as the PCI to be allocated to the small base station 35A.

  Next, each independent SON server 20A, 20B, 20C transmits the PCI value determined in S103 to the subordinate macro base stations 30A, 30B, 30C and small base stations 35A, 35C, 35D, 35E, respectively. PCI update is instructed (step 104).

[Embodiment 2]
FIG. 4 is an explanatory diagram showing an example of the overall configuration of a communication management system according to another embodiment of the present invention. In the embodiment of FIG. 4, as a plurality of independent management servers, a plurality of independent SON servers 20A, 20B, 20C dedicated to macro base stations, and an independent SON server dedicated to small base stations (hereinafter referred to as “SON servers for small base stations”). 25). The independent SON servers 20A, 20B, and 20C dedicated to the macro base station are provided for each of a plurality of base station groups whose macro base station vendors (A, B, and C) are different from each other. The independent SON servers 20A, 20B, and 20C each manage parameters of a plurality of macro base stations of the same vendor. The small base station SON server 25 is provided in a base station group to which only a plurality of small base stations 35A, 35C, 35D, and 35E belong regardless of the vendor, and centrally manages parameters of all the small base stations. In FIG. 4, the same parts as those in FIG.

  FIGS. 5A, 5B, and 5C show the integrated SON server 10, the independent SON server 20 (20A, 20B, 20C, 25), and the base station 30 (30A, 30B, 25) in the communication management system of FIG. 30C, 35A, 35C, 35D, 35E) is a functional block diagram illustrating a schematic configuration example of a main part. 5A, 5B, and 5C, the same reference numerals are given to the same portions as those in FIGS. 2A, 2B, and 2C, and the description thereof is omitted.

5A, the integrated SON server 10 includes a control unit 101, a macro base station parameter transmission unit 103, and a small base station parameter transmission unit 104.
The macro base station parameter transmission unit 103 transmits the range of PCI candidate values (PCI candidate table) for the macro base station determined by the control unit 101 to the plurality of independent SON servers 20A, 20B, and 20C for the macro base station. To do.
The small base station parameter transmission unit 104 transmits the PCI base value range (PCI candidate table) for the small base station determined by the control unit 101 to the small base station SON server 25.

  The configuration and function of the independent SON server 20 in FIG. 5B are the same as those in FIG. Also, the configuration and function of the base station 30 in FIG. 5C are the same as those in FIG.

FIG. 6 is a flowchart showing an example of parameter management in the communication management system of FIG. FIG. 6 shows that the integrated SON server 10 is connected to each base station (macro base stations 30A, 30B, 30C and small base stations 35A, 35C via a plurality of independent SON servers 20A, 20B, 20C and the small base station SON server 25). , 35D, 35E) are centrally managed.
In FIG. 6, first, the integrated SON server 10 determines a range of PCI candidate values that can be assigned to the independent SON servers 20A, 20B, and 20C and the small base station SON server 25 (step 201). The range of PCI candidate values is determined, for example, as in the following (1) to (4).
(1) PCI candidate values assigned to the independent SON server 20A: 0 to 99
(2) PCI candidate values assigned to independent SON server 20B: 100-199
(3) PCI candidate values assigned to the independent SON server 20C: 200 to 299
(4) PCI candidate values assigned to the small base station SON server 25: 400 to 503

Next, the integrated SON server 10 distributes a PCI candidate table indicating the range of PCI candidate values to the independent SON servers 20A, 20B, 20C and the small base station SON server 25 (step 202).
Next, the independent SON servers 20A, 20B, and 20C and the small base station SON server 25 are subordinate to the subordinate macro base stations 30A, 30B, and 30C and the small base station 35A based on the PCI candidate table received from the integrated SON server 10. , 35C, 35D, and 35E, PCI values to be assigned are determined (step 203).
For example, the independent SON server 20C of the vendor C determines “200” as the PCI to be assigned to the subordinate macro base station 30C because the range of PCI candidate values received from the integrated SON server 10 is 200 to 299.
Further, the small base station SON server 25 determines the PCI to be assigned to the small base station 35C as “501” because the range of PCI candidate values received from the integrated SON server 10 is 400 to 503, and the small base station “459” is determined as the PCI to be assigned to 35A.

  Next, each independent SON server 20A, 20B, 20C transmits the PCI value determined in S203 to each of the subordinate macro base stations 30A, 30B, 30C, and instructs PCI update (step 204). The small base station SON server 25 transmits the PCI value determined in S203 to each of the subordinate small base stations 35A, 35C, 35D, and 35E, and instructs PCI update (step 204).

  In addition to the PCI described in the first and second embodiments, there are many parameters that should be controlled so that values do not overlap between adjacent base stations. For example, a PRACH (Physical Random Access Channel) related parameter includes a root sequence index. This root sequence index can also be set in the same manner as the PCI of this embodiment. For example, the integrated SON server determines the range of route sequence index candidate values that can be assigned to the base station by each independent SON server, and each independent SON server determines the value of the route sequence index to be assigned to the subordinate base station. .

In addition, for the following parameters (1) to (3), the same parameter value is set between adjacent base stations. Specifically, the value of each parameter is uniquely determined by the communication carrier in consideration of the installation status of the base station, and is centrally managed by the integrated SON server. By centrally managing these parameters and setting them in each base station, the time and frequency resources used by each base station's PRACH (physical random access channel) are the same, and the sequences used by each PRACH are different orthogonal Since it is a series, interference between PRACHs between adjacent base stations is reduced.
(1) Configuration index
(2) High Speed Flag
(3) Frequency offset

[Embodiment 3]
FIG. 7 is an explanatory diagram showing an example of the overall configuration of a communication management system according to still another embodiment of the present invention. In the embodiment of FIG. 7, similar to the configuration of FIG. 4 described above, as a plurality of independent management servers, a plurality of independent SON servers 20A, 20B, 20C dedicated to macro base stations and a small base station SON server 25 are provided. I have. In the embodiment of FIG. 7, the integrated SON server 10 moves the mobile device 50 between the macro cell 300C of the macro base station 30C and the cell 350C of the small base station 35C via the independent SON server 20C and the small base station SON server 25. This is an example of adjusting a handover (HO) offset parameter when the is performing a handover. In FIG. 7, the same parts as those in FIGS. 1 and 4 described above are denoted by the same reference numerals and description thereof is omitted.

  FIGS. 8A, 8B, and 8C are respectively an integrated SON server 10, an independent SON server 20 (20A, 20B, 20C, 25) and a base station 30 (30A, 30B, 30) in the communication management system of FIG. 30C, 35A, 35C, 35D, 35E) is a functional block diagram illustrating a schematic configuration example of a main part. 8 (a), (b) and (c), the same parts as those in FIGS. 2 (a), (b) and (c) and FIGS. 5 (a), (b) and (c). Are denoted by the same reference numerals, and description thereof is omitted.

8A, the integrated SON server 10 includes a control unit 101, a macro base station parameter transmission unit 103, a small base station parameter transmission unit 104, a macro base station information reception unit 105, and a small base station information reception unit 106. Prepare.
The control unit 101 controls each unit and determines an optimum value of the handover (HO) offset based on the ping-pong HO information (HO frequency) received from the base station.
The macro base station parameter transmission unit 103 transmits the value of the HO offset determined by the control unit 101 to a plurality of independent SON servers 20A, 20B, and 20C for macro base stations.
The small base station parameter transmission unit 104 transmits the HO offset value determined by the control unit 101 to the small base station SON server 25.
The macro base station information receiving unit 105 receives ping-pong handover (HO) information (HO frequency) managed by the subordinate base stations 30A, 30B, and 30C from the independent SON servers 20A, 20B, and 20C for the macro base station. To do.
The small base station information receiving unit 106 receives the ping-pong HO information (HO frequency) managed by the subordinate small base stations 35A, 35C, 35D, and 35E from the small base station SON server 25.

8B, the independent SON server 20 includes a parameter reception unit 201, a parameter management unit 202, a parameter transmission unit 203, a base station management unit 204, an information reception unit 205, and an information transmission unit 206.
The parameter receiving unit 201 receives the HO offset value determined by the integrated SON server 10 from the integrated SON server 10.
The parameter management unit 202 manages the HO offset value received from the integrated SON server 10 and the ping-pong HO information (HO frequency) received from the base station.
The parameter transmission unit 203 transmits the HO offset value received from the integrated SON server 10 to the parameter setting target base station.
The information receiving unit 205 receives ping-pong HO information (HO frequency) from subordinate base stations.
The information transmission unit 206 transmits the ping-pong HO information (HO frequency) received from the subordinate base station to the integrated SON server 10.

8C, the base station 30 includes a parameter receiving unit 301, a control unit 302, a broadcast information generating unit 309, an OFDM modulation unit 307, a transmission radio unit 308T, a reception radio unit 308R, and a duplexer (DUP: Duplexer (308S), SC-FDMA (Single-Carrier Frequency-Division Multiple Access) demodulator 310, CQI (Channel Quality Indicator) information extractor 311 and information transmitter 312.
The parameter receiving unit 301 receives the value of the HO offset from the upper independent SON server 20.
The control unit 302 controls each unit and sets (updates) the value of the HO offset received from the independent SON server 20. Further, the control unit 302 records the hand-in time and the hand-out time based on the CQI information received from the mobile device 50, and measures the HO frequency as the HO information.
The notification information generation unit 309 generates notification information to be transmitted to the mobile device 50.
The OFDM modulation unit 307 modulates various baseband transmission signals using an OFDM (Orthogonal Frequency Division Multiplexing) scheme.
The transmission radio unit 308T converts the transmission signal generated by the modulation by the OFDM modulation unit 307 into a high frequency signal, amplifies it, and sends it to the duplexer 308S.
Reception radio section 308R amplifies the received signal received by the antenna, converts it into a baseband signal, and sends it to SC-FDMA demodulation section 310.
The duplexer 308S switches the path of the transmission signal and reception signal for the antenna.
SC-FDMA demodulation section 310 demodulates a reception signal modulated by the SC-FDMA method to obtain a reception signal.
CQI information extraction section 311 extracts CQI information from the received signal demodulated by SC-FDMA demodulation section 310.
The information transmission unit 312 transmits the HO information (HO frequency) measured by the control unit 302 to the upper independent SON server 20.

  FIG. 9 is a flowchart showing an example of parameter management in the communication management system of FIG. FIG. 9 shows that the integrated SON server 10 performs handover between the cell 300C of the macro base station 30C and the cell 350C of the small base station 35C via the independent SON server 20C and the small base station SON server 25. This is an example of adjusting the handover (HO) offset parameter when the operation is being performed.

  In FIG. 9, first, the macro base station 30C of the cell 300C to which the mobile device 50 is handed over and the small base station 35C of the cell 350C each receive the hand of the mobile device 50 based on the CQI information received from the mobile device 50. The IN time and the handout time are recorded, and the handover (HO) frequency is measured (step 301).

  Next, if the measured HO frequency is greater than or equal to the threshold value, the macro base station 30C and the small base station 35C indicate that there are mobile devices 50 that frequently repeat handover, respectively. This is reported to the integrated SON server 10 via the primary SON server 25 (step 302).

  Next, the integrated SON server 10 adjusts and updates the value of the HO parameter (HO offset) based on the report (step 303). The adjustment of the value of the HO parameter (HO offset) is performed as follows, for example.

Table 1 shows some of parameters that can be set in the base station in relation to the handover of the mobile device 50.

Here, the mobile device 50 performs handover so as to select a cell (base station) that satisfies the HO conditions shown in the following (1) to (3). That is, when the values of the required reception level Srxlev for cell selection and the required reception quality Squal for cell selection are greater than 0, handover of the mobile device 50 occurs.
HO condition: Srxlev> 0 and Squal> 0 (1)
Srxlev = Qrxlevmeas− (Qrxlevmin + Qrxlevminoffset) −Pcompensation (2)
Squal = Qqualmeas- (Qqualmin + Qqualminoffset) (3)

  If the value of the HO offset (Qrxlevminoffset, Qqualminoffset) in the above equations (2) and (3) is increased, the required reception level Srxlev for cell selection and the required reception quality Squal for cell selection become smaller. It turns out that it becomes difficult to hand over by the formula. Therefore, when ping-pong handover is repeated, it is possible to make it difficult for handover to occur by adjusting the value of the HO offset (Qrxlevminoffset, Qqualminoffset) to be large.

  Next, the integrated SON server 10 transmits the updated new HO parameter (HO offset) to the macro base station 30C and the small base station 35C via the independent SON server 20C and the small base station SON server 25. The HO parameter (HO offset) is instructed to be updated (step 304). By updating this HO parameter, the occurrence of ping-pong handover of the mobile device 50 can be suppressed.

  In the example of FIG. 9, the HO offset (Qrxlevminoffset, Qqualminoffset) is adjusted as a HO parameter for suppressing the occurrence of ping-pong handover. You may adjust the trigger timer.

DESCRIPTION OF SYMBOLS 10 Integrated SON server 20 Independent SON server 20A, 20B, 20C Independent SON server 25 Independent SON server (SON server for small base stations)
30 Base station 30A, 30B, 30C Macro base station 35A, 35C, 35D, 35E Small base station 50 Mobile device 300A, 300B, 300C Macro cell 350A, 350C, 350D, 350E Small base station cell

JP 2012-009990 A Japanese Patent Laying-Open No. 0012-085201

Claims (8)

A communication management system that manages parameters of a plurality of macro base stations and parameters of a plurality of small base stations that are arranged in a radio communication area of the macro base station and have a smaller radio communication area than the macro base station ,
Provided for each of a plurality of base station groups having different macro base station providers, and dedicated to a plurality of macro base stations for managing parameters of a plurality of macro base stations belonging to the base station group for each of the plurality of base station groups An independent management server;
An independent management server dedicated to a small base station, which is provided in a base station group to which all of the plurality of small base stations belong, regardless of a small base station provider, and manages parameters of the plurality of small base stations belonging to the base station group When,
The independent management server dedicated to the plurality of macro base stations and the independent management server dedicated to the small base station are configured to be able to communicate with each, and the independent management server dedicated to the plurality of macro base stations and the independent management server dedicated to the small base station manage via the server, and a integrated management server to centrally manage the parameters of the plurality of macro base station and the parameters of the plurality of small base stations,
The integrated management server
A parameter value determination means for determining a value of said plurality of macro base stations and configurable parameters to the plurality of small base stations,
Transmission means for transmitting the parameter value determined by the parameter value determination means to the independent management server of the base station group to which the parameter setting target base station belongs,
Each of the plurality of macro-independent management server of the base station only receives the value of the parameter for the macro base station of the parameter setting target from the integrated management server, based on the value of the parameter, the parameter setting target macro base Instruct the station to set the parameter ,
The independent management server dedicated to the small base station receives the parameter value for the parameter setting target small base station from the integrated management server, and based on the parameter value, the parameter setting target small base station And instructing the setting of the parameter . The communication management system according to claim 1,
The integrated management server further comprises information acquisition means for acquiring information on all or part of the plurality of macro base stations and the plurality of small base stations belonging to the plurality of base station groups,
The communication management system characterized in that the parameter value determining means of the integrated management server determines an optimum value of a parameter to be set in the base station based on the base station information acquired by the information acquiring means. In the communication management system according to claim 1 or 2 ,
The parameter managed by the integrated management server is a parameter in which different values are set so as not to overlap between a plurality of adjacent base stations. The communication management system according to claim 3 ,
The parameter value determining means integrated management server, the range of possible values of the assigned parameters to the said belong to each of the plurality of base station groups a plurality of macro base station and the plurality of small base stations, wherein the plurality of macro base Determined so as not to overlap between the independent management server dedicated to the station and the independent management server dedicated to the small base station ,
The transmission means of the integrated management server transmits a range of candidate values of the parameter to the independent management server dedicated to the plurality of macro base stations and the independent management server dedicated to the small base station ,
Each of the independent management servers dedicated to the plurality of macro base stations is based on the range of candidate values of the parameters received from the integrated management server, with respect to the macro base stations subordinate to the independent management server dedicated to the macro base station. Instruct the setting of the parameter ,
The independent management server dedicated to the small base station, based on the range of candidate values of the parameter received from the integrated management server, the parameter of the parameter to the small base station subordinate to the independent management server dedicated to the small base station. A communication management system characterized by instructing setting . In the communication management system according to claim 1 or 2 ,
The communication management system characterized in that the parameter managed by the integrated management server is a parameter in which the same value is set between a plurality of adjacent base stations.   In the communication management system according to any one of claims 1 to 5,
  The communication management system, wherein the parameter is a base station identification number assigned to the plurality of macro base stations and the plurality of small base stations. In the communication management system according to claim 1 or 2 ,
The information acquisition means of the integrated management server is configured to manage information managed by each of the plurality of macro base stations and the plurality of small base stations, and to manage independent information for the plurality of macro base stations and independent management dedicated to the small base stations. Get through the server ,
The parameter value determining means integrated management server, the parameters each of the plurality of macro base station and the plurality of small base stations based on the information managed, and sets the respective plurality of macro base stations and the plurality of small base stations communication management system for the values, wherein the determined Teisu Rukoto.   The communication management system according to claim 7, wherein
  Information managed by each of the plurality of macro base stations and the plurality of small base stations is handover frequency information,
  The communication management system, wherein the parameter is a handover offset parameter.

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