JP5829474B2 - Radio management apparatus, radio management method, program, and mobile communication system - Google Patents

Description

The present invention relates to a radio control apparatus, radio management method, a program, and a mobile communication system.

As the mobile communication system of the 3.9 generation, etc. The ^{3GPP (3 rd Generation Partnership Project)} LTE standardization is underway in the (Long Term Evolution), to support the handover of the mobile terminal between base stations, base The station holds information indicating a base station that covers an area adjacent to the area covered by the station. An adjacent cell list that is information indicating a base station covering the adjacent area is notified from the base station to the mobile terminal using a broadcast channel or the like (Non-Patent Document 1).
The mobile terminal measures the signal strength from the connected base station or the base station included in the adjacent cell list, and notifies the connected base station of the measurement result. Based on the measurement result received from the mobile terminal, the base station selects whether or not handover is required and the handover destination base station.

By the way, when a base station is newly established or removed, in order to perform an appropriate handover, it is necessary to make the adjacent cell list coincide with the actual arrangement of the base stations. In a general mobile communication system, an administrator or operator of the mobile communication system manually updates the neighboring cell list according to installation or removal of a base station. However, ANR (Automatic Neighbor Relation) that updates the neighbor cell list without human intervention has been studied with the aim of automating the operation of the mobile communication system (Non-patent Document 1).
When ANR is used, the mobile terminal measures the signal strength from the base station that can be detected at the current position based on an instruction from the base station, and transmits the measurement result to the base station (Measurement Report). The base station updates the neighbor cell list based on the measurement result received from the mobile terminal, thereby making it possible to match the actual base station arrangement with the neighbor cell list to keep the latest state.

In order to accommodate traffic in mobile communication systems that will increase in the future, the functions of a base station will be separated into a radio control device and an antenna device, and multiple radio control devices will be integrated into the same station Network architecture has been studied (Non-Patent Documents 2 and 3).
A feature of this wireless network architecture is that the connection relationship between the wireless control device and the antenna device can be flexibly and dynamically changed. For example, it is possible to efficiently use the resources of a limited radio control device by allocating more radio control devices to an area where a lot of traffic occurs according to traffic time fluctuation or daily fluctuation. It becomes possible. Also in the radio network architecture, it is necessary to update the neighbor cell list so that the mobile terminal can be appropriately handed over between base stations. The adjacent cell list is managed for each wireless control device that performs wireless protocol processing, and includes information indicating a wireless control device that covers an area adjacent to an area covered by the wireless control device.

3GPP TS 36.300, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2” "Nokia Siemens Networks launches Liquid Radio", [online], March 21, 2011, Nokia Siemens Networks, [searched September 16, 2011], Internet <http://www.nokiasiemensnetworks.com/news- events / press-room / press-releases / nokia-siemens-networks-launches-liquid-radio> "Light Radio (TM): Evolve your wireless broadband network for the new generation of applications and users", [online], July 29, 2011, Alcatel-Lucent, [Search September 19, 2011], Internet <http://www.alcatel-lucent.com/features/light_radio/index.html>

Non-Patent Documents 2, 3 and the like are being studied, and in a wireless network architecture in which a base station is separated into a wireless control device and an antenna device and a plurality of wireless control devices are aggregated, depending on traffic conditions, etc. The connection relationship between the radio control device and the antenna device is dynamically changed. When changing the connection relationship, the adjacent relationship of the radio network controller changes, so it is necessary to update the adjacent cell list appropriately.
For example, when ANR is applied to update the neighbor cell list, the neighbor cell list is correctly updated because the mobile terminal needs to measure the signal strength from the base station and transmit the measurement result to the radio controller. There is a possibility that the time lag that occurs up to will become longer. In this case, if handover of the mobile terminal occurs before the neighbor cell list is updated, there is a problem that the mobile terminal may be disconnected without being able to perform handover correctly. .

The present invention has been made to solve the above problems, and its object is to provide a wireless network architecture capable of dynamically changing the connection relationship between an antenna device and a radio control device, between the antenna device and the radio control device. and updating the connection relationship, a radio control apparatus to reduce the time difference between the updated neighbor cell list to provide a radio control method, program and mobile communication systems.

In order to solve the above problem, the present invention provides a plurality of antenna devices that perform wireless communication with a mobile terminal, a plurality of radio control devices that control the antenna devices, and between the antenna devices and the radio control devices. A wireless management device in a mobile communication system including a wireless management device that manages a connection relationship between the first and second wireless control devices, wherein a first connection antenna device list indicating the antenna devices connected to each of the wireless control devices is stored; And a second adjacent antenna device list indicating adjacent antenna devices that are other antenna devices having a communication area adjacent to the communication area of the antenna device for each of the antenna devices. And the connection antenna device reconfiguration according to a switching signal indicating switching of connection between the table unit and the antenna device and the radio control device. Update the door, and connecting the antenna device list after updating the switching signal a neighbor cell list of another said wireless control unit having a communication area with the the adjacent antenna device list adjacent each of the radio network controller and a table updating unit for updating, based on, the table updating unit includes a switching instruction signal for instructing the switching of the connection between the antenna device and the wireless control device represented by the switching signal, the radio network controller The wireless management device is characterized by transmitting an update instruction signal for updating the adjacent cell list stored in the wireless control device based on the updated adjacent cell list to the wireless control device .

Also, in the present invention described in the above, the table update unit includes information indicating an antenna device that switches the connection destination, and a connection antenna device list corresponding to the radio control device to which the antenna device is connected. The information indicating the antenna device is added to the connected antenna device list corresponding to the radio control device to which the antenna device is newly connected, and is included in the connected antenna device list corresponding to the radio control device. An adjacent antenna device of the antenna device is detected from the adjacent antenna device list, and information indicating the other radio control device connected to the detected adjacent antenna device is used as an updated adjacent cell list. .

  In the invention described in the above, the table update unit detects an adjacent antenna device of the antenna device that switches a connection destination indicated by the switching signal from the adjacent antenna device list, and detects the detected adjacent antenna. The wireless control device connected to a device is detected from the connected antenna device list, and the adjacent wireless device is connected to the adjacent antenna device of the antenna device connected to the wireless control device. The radio control apparatus to which the detected radio control apparatus and the antenna apparatus that switches the connection destination indicated by the switching signal are connected to a cell list update target, and the radio control apparatus that newly connects the antenna apparatus And is selected.

  Moreover, the present invention is the above-described invention, wherein the table updating unit further updates the neighboring cell list, and then transmits the updated neighboring cell list to the radio control apparatus selected as the update target. It is characterized by that.

  Further, in the present invention according to the invention described above, the table update unit further detects an adjacent antenna device of the antenna device that switches a connection destination indicated by the switching signal from the adjacent antenna device list, and detects the detected antenna device. The radio control device that detects the radio control device connected to an adjacent antenna device from the connected antenna device list and that is connected to an antenna device that switches a connection destination indicated by the switching signal among the detected radio control devices. An update instruction signal indicating the antenna device that switches the connection destination to the radio control device excluding the device and the radio control device that newly connects the antenna device, and the radio control device that is the switching destination of the antenna device Is transmitted.

  In the invention described above, the table update unit may further include an adjacent antenna device list corresponding to an antenna device that switches a connection destination indicated by the switching signal, and an antenna included in the adjacent antenna device list. Information indicating the radio control device connected to the device and the antenna device switching source and switching destination are transmitted to the radio control device.

In addition, the present invention provides an adjacent antenna that indicates an adjacent antenna device that is another antenna device having a communication area adjacent to a communication area of the antenna device for each of a plurality of antenna devices that perform radio communication with a mobile terminal. A second table section storing a device list; a first table storing a connected antenna device list indicating the antenna devices connected to each of a plurality of radio control devices controlling the antenna device; A wireless management method in a wireless management device comprising: updating the connected antenna device list according to a switching signal indicating switching of connection between the antenna device and the wireless control device, and for each wireless control device Adjacent cell lists indicating other wireless control devices having adjacent communication areas of the switching signal and the adjacent antenna device. Lists and the updated connection antenna device list table updating step of updating based on the switching instruction signal for instructing the switching of the connection between the antenna device and the wireless control device represented by the switching signal, the radio control An instruction step of transmitting an update instruction signal for updating an adjacent cell list stored in the apparatus based on the updated adjacent cell list to the radio control apparatus .

In addition, the present invention provides an adjacent antenna that indicates an adjacent antenna device that is another antenna device having a communication area adjacent to a communication area of the antenna device for each of a plurality of antenna devices that perform radio communication with a mobile terminal. A second table section storing a device list; a first table storing a connected antenna device list indicating the antenna devices connected to each of a plurality of radio control devices controlling the antenna device; A wireless management device equipped with a computer, and updates the connection antenna device list according to a switching signal indicating switching of connection between the antenna device and the wireless control device, for each wireless control device The adjacent cell list indicating the other radio control apparatus having the adjacent communication area of the switching signal and the adjacent antenna And table updating step of updating on the basis of a connection antenna device list updated with the location list, and switching instruction signal for instructing switching of the connection of the antenna device and indicated by the switching signal and the radio network controller, the radio A program for executing an instruction step of transmitting an update instruction signal for updating an adjacent cell list stored in a control apparatus based on an updated adjacent cell list to the radio control apparatus .
The present invention also manages a plurality of antenna devices that perform wireless communication with a mobile terminal, a plurality of radio control devices that control the antenna devices, and a connection relationship between the antenna devices and the radio control devices. A mobile communication system including a radio management device, wherein the radio management device includes a first table unit storing a connected antenna device list indicating the antenna devices connected to each of the radio control devices; A second table section storing a list of adjacent antenna devices indicating adjacent antenna devices which are other antenna devices having a communication area adjacent to a communication area of the antenna device for each antenna device; , Updating the connected antenna device list according to a switching signal indicating switching of connection between the antenna device and the radio control device, and the radio Table update for updating an adjacent cell list indicating another radio control apparatus having an adjacent communication area for each control apparatus based on the switching signal, the adjacent antenna apparatus list, and the updated connected antenna apparatus list And the table updating unit includes a switching instruction signal for instructing switching of connection between the antenna apparatus and the radio control apparatus indicated by the switch signal, and an adjacent cell stored in the radio control apparatus An update instruction signal for updating a list based on an updated neighbor cell list is transmitted to the radio control apparatus.

  According to the present invention, the radio management apparatus updates the connected antenna apparatus list according to the switching signal. As a result, the radio management apparatus connects to the other antenna apparatus having a communication area adjacent to the communication area of the antenna apparatus connected to each radio control apparatus from the updated connection antenna apparatus list and the adjacent antenna apparatus list. Can be detected and the neighbor cell list can be updated. That is, the radio management apparatus supports the state after switching the connection of the antenna apparatus without using the measurement result in the mobile terminal immediately before switching the connection between the antenna apparatus and the radio control apparatus, or immediately after switching. The adjacent cell list can be obtained, and the time lag when switching the connection and updating the adjacent cell list can be reduced. As a result, it is possible to suppress a failure in handover of the mobile terminal.

It is the schematic which shows the structure of the mobile communication system 100 in 1st Embodiment. It is a schematic block diagram which shows the structure of the radio | wireless management apparatus 1 and the radio | wireless control apparatus 2 in the embodiment. It is a figure which shows an example of the RCU table 11 in the embodiment. It is a figure which shows an example of the RRH table 12 in the same embodiment. It is the figure which changed the connection destination of the antenna apparatus 3c shown in FIG. 1 in the embodiment. It is a sequence diagram which shows the process example which updates the adjacent cell list | wrist in the embodiment. It is a flowchart of the process which updates the adjacent cell list | wrist and connection RRH list | wrist in the embodiment. It is a figure which shows the RCU table after switching the connection destination of the antenna apparatus 3c from the radio | wireless control apparatus 2C to the radio | wireless control apparatus 2B in the same embodiment. It is a schematic block diagram which shows the structure of the radio | wireless management apparatus 5 and the radio | wireless control apparatus 2 in 2nd Embodiment. It is a figure which shows an example of the connection RRH information memorize | stored in the RCU table 52 in the same embodiment, and adjacent RRH information. It is a figure which shows an example of the connection RRH information and adjacent RRH information which are memorize | stored in the RRH table 61 in the same embodiment. It is a sequence diagram which shows the process example which updates the adjacent cell list | wrist in the embodiment. It is a figure which shows the process (step S205) which updates the adjacent cell list | wrist of the radio | wireless control apparatus 6 of the switching origin in the same embodiment. It is a figure which shows the process (step S207) which updates the adjacent cell list | wrist of the radio | wireless control apparatus 6 of the switching destination in the same embodiment. It is a figure which shows the process (step S210) which updates the adjacent cell list of the radio | wireless control apparatus 6 which needs the update of the adjacent cell list in the embodiment. It is a figure which shows the RCU table 52 after switching the connection destination of the antenna apparatus 3c from the radio | wireless control apparatus 6C to the radio | wireless control apparatus 6B in the same embodiment. It is a schematic block diagram which shows the structure of the radio | wireless management apparatus 7 and the radio | wireless control apparatus 8 in 3rd Embodiment. It is a sequence diagram which shows the process example which updates the adjacent cell list | wrist in the embodiment.

  Hereinafter, a radio management apparatus, a radio management method, and a program according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic diagram illustrating a configuration of a mobile communication system 100 according to the first embodiment. As shown in the figure, the mobile communication system 100 includes a radio management unit (RMU) 1 and a plurality of radio control units (RCU) 2A to 2E connected to the radio management device 1. And a plurality of antenna devices (Remote Radio Heads; RRH) 3a to 3h connected to the radio control devices 2A to 2E, and a packet gateway 102 for connecting the radio management device 1 to the packet core 103. Each of the wireless control devices 2A to 2E has the same configuration. Hereinafter, the wireless control device 2A to 2E will be referred to as the wireless control device 2 when showing either or all of the wireless control devices 2A to 2E. In addition, the antenna devices 3a to 3h have the same configuration, and are hereinafter referred to as the antenna device 3 when showing any or all of the antenna devices 3a to 3h.

  The radio management apparatus 1 controls the connection relationship between the radio control apparatus 2 and the antenna apparatus 3, and the number of mobile terminals (not shown) connected to each radio control apparatus 2 and the traffic required for each radio control apparatus 2. The connection relationship with the antenna device 3 connected to the wireless control device 2 is determined according to the above. Further, the radio management apparatus 1 transmits a switching instruction signal indicating switching of the connection with the antenna apparatus 3 and an update instruction signal for updating the adjacent cell list to the radio control apparatus 2 based on the determined connection relationship. The neighbor cell list is a list indicating the neighbor relationship between cells formed by the radio network controller 2 for each radio network controller 2.

  The radio control apparatus 2 performs processing such as call control and radio resource scheduling in the radio base station apparatus, is connected to the packet core 103 via the radio management apparatus 1 and the packet gateway 102, and is connected to the uplink and downlink bases. Perform band processing. Each of the radio control devices 2A to 2E is connected to a different antenna device 3, receives an uplink signal from the connected antenna device 3, and transmits a downlink signal to the connected antenna device 3. To do.

In addition, a plurality of antenna devices 3 can be connected to the wireless control device 2, and when a plurality of antenna devices 3 are connected, a plurality of connected antenna devices are provided as in the distributed antenna technology. 3 transmits a signal including the same data. In addition, the wireless control device 2 forms a cell in the communicable area (communication area) of the connected antenna device 3. When a plurality of antenna devices 3 are connected, the communicable areas of the antenna devices 3 are combined to form one cell.
The antenna device 3 is a wireless communication unit in which a wireless communication function including an antenna element in the wireless base station device is made independent, and performs wireless communication with a mobile terminal. The antenna device 3 is connected to the radio control devices 2A to 2E using an optical fiber line or the like.

In the example shown in FIG. 1, the antenna device 3a is arranged adjacent to the antenna devices 3b and 3e, the antenna device 3b is arranged adjacent to the antenna devices 3a, 3c, and 3f, and the antenna device 3c is arranged as the antenna devices 3b and 3d. The antenna device 3d is arranged adjacent to the antenna devices 3c and 3h.
The antenna device 3e is disposed adjacent to the antenna devices 3a and 3f, the antenna device 3f is disposed adjacent to the antenna devices 3b, 3e, and 3g, and the antenna device 3g is adjacent to the antenna devices 3c, 3f, and 3h. The antenna device 3h is arranged adjacent to the antenna devices 3d and 3g.
Antenna devices 3a and 3e are connected to the radio control device 2A. Antenna devices 3b and 3f are connected to the wireless control device 2B. Antenna devices 3c and 3g are connected to the wireless control device 2C. An antenna device 3d is connected to the radio control device 2D. An antenna device 3h is connected to the radio control device 2E.

The wireless management device 1 and the wireless control device 2 are installed together in the aggregation center 101, for example. The antenna device 3 is installed at a position away from the aggregation center 101.
The packet gateway 102 connects the radio management apparatus 1 installed in the aggregation center 101 and the packet core 103, transmits and receives signals between the radio management apparatus 1 and the packet core 103, and relays signals. To do.
The packet core 103 is a network connected to another mobile communication system or an external network such as the Internet.

  FIG. 2 is a schematic block diagram showing the configuration of the radio management apparatus 1 and the radio control apparatus 2 in the present embodiment. As shown in the figure, the radio management apparatus 1 includes an RCU table 11, an RRH table 12, a resource assignment unit 13, and an RCU table update unit 14.

  The RCU table 11 stores a connection antenna device list and a neighbor cell list in association with each other for each radio control device 2. Here, the connected antenna device list (hereinafter referred to as a connected RRH list) is information indicating the antenna device 3 connected to the radio network controller 2. The neighbor cell list is information indicating the radio network controller 2 that forms a cell adjacent to the cell of the radio network controller 2. For example, in FIG. 1, the connected antenna device list associated with the radio network controller 2B is information indicating “antenna device 3b, antenna device 3f”. The adjacent cell list associated with the radio network controller 2B is information indicating “radio network controller 2A, radio network controller 2C”.

  In the RRH table 12, an adjacent RRH list is associated with each antenna device 3 and stored in advance. The adjacent RRH list is information indicating the antenna device 3 having an area adjacent to the communicable area of the antenna device 3 as a communicable area. For example, in FIG. 1, the adjacent RRH list associated with the antenna device 3c is information indicating “antenna device 3b, antenna device 3d, antenna device 3g”.

  FIG. 3 is a diagram illustrating an example of the RCU table 11 in the present embodiment. As shown in the figure, in the RCU table 11, the connected RRH list and the adjacent cell list are associated with an identifier (RCU-ID) for identifying each radio control apparatus 2. For example, the RCU-ID “C” indicating the radio control apparatus 2C includes a connection RRH list “c, g” indicating “antenna apparatus 3c, antenna apparatus 3g”, “radio control apparatus 2B, radio control apparatus 2D, radio The adjacent cell list “B, D, E” indicating the “control device 2E” is associated with the control device 2E.

  FIG. 4 is a diagram illustrating an example of the RRH table 12 in the present embodiment. As shown in the figure, in the RRH table 12, an adjacent RRH list is associated with an identifier (RRH-ID) for identifying each antenna device 3. For example, the RRH-ID “c” indicating the antenna device 3c is associated with the adjacent RRH list “b, d, g” indicating “the antenna device 3b, the antenna device 3d, and the antenna device 3g”.

Returning to FIG. 2, the description of the configuration of the radio management apparatus 1 and the radio control apparatus 2 will be continued.
Based on the traffic information received from the radio network controller 2, the resource allocation unit 13 determines the antenna apparatus 3 connected to each radio network controller 2 and generates a switching signal according to the determination. The traffic information is information indicating the amount of data transmitted / received by the wireless control device 2 using each antenna device 3, for example. The switching signal is a signal including information indicating the antenna device 3 whose connection destination is changed and information indicating a new connection destination of the antenna device 3. Further, the resource allocation unit 13 determines the connection relationship using a known technique.

  The RCU table updating unit 14 is connected to the connected RRH list and the neighboring cell list stored in the RCU table 11 based on the switching signal input from the resource allocation unit 13 and the neighboring RRH list stored in the RRH table 12. Update. The RCU table updating unit 14 updates the switching instruction signal for switching the connection with the antenna device 3 and the neighboring cell list stored in each radio control device 2 based on the update result of the connected RRH list and the neighboring cell list. The update instruction signal to be generated is generated and transmitted to the wireless control device 2.

The radio network controller 2 includes an adjacent cell table 21, a communication unit 22, and an adjacent cell table update unit 23. The adjacent cell table 21 stores an adjacent cell list indicating the radio network controller 2 that forms a cell adjacent to its own cell.
The communication unit 22 is connected to the antenna device 3 specified by the switching instruction signal input from the adjacent cell table update unit 23, and communicates with the mobile terminal via the connected antenna device 3. The communication unit 22 transmits traffic information transmitted / received by each antenna device 3 to / from the mobile terminal to the radio management apparatus 1. In addition, the communication unit 22 reads the neighboring cell list stored in the neighboring cell table 21 and transmits the read neighboring cell list to the antenna device 3. In the antenna device 3, the adjacent cell list is transmitted to the mobile terminal using a broadcast channel or the like.
The adjacent cell table update unit 23 receives the switching instruction signal and the update instruction signal from the radio management apparatus 1. The adjacent cell table update unit 23 outputs the received switching instruction signal to the communication unit 22 and updates the adjacent cell list stored in the adjacent cell table 21 based on the received update instruction signal.

  Hereinafter, a process of updating the neighboring cell list stored in the wireless control device 2 will be described with a specific example. FIG. 5 is a diagram in which the connection destination of the antenna device 3c in the mobile communication system 100 shown in FIG. 1 is changed. Here, as shown in FIG. 5, the process of switching the connection destination of the antenna device 3c connected to the wireless control device 2C to the wireless control device 2B is taken as an example, and the wireless management device 1 and the wireless control device 2 The operation will be described. That is, the operation when the connection relationship shown in FIG. 1 is changed to the connection relationship shown in FIG. 5 will be described. In addition, RCU-IDs for identifying the radio control devices 2A to 2E are “A”, “B”, “C”, “D”, and “E”, and RRH-IDs for identifying the antenna devices 3a to 3h are set. The description will be given as “a”, “b”, “c”, “d”, “e”, “f”, “g”, “h”.

  As shown in FIG. 5, by switching the connection destination of the antenna device 3c to the radio control device 2B, adjacent cells of the radio control devices 2B, 2C, and 2D change. The adjacent cells of the radio control device 2B are cells formed by the radio control devices 2A, 2C, and 2D. The adjacent cell of the radio control device 2C is a cell formed by the radio control devices 2B and 2E. The adjacent cell of the radio network controller 2D is a cell formed by the radio network controllers 2B and 2E.

  FIG. 6 is a sequence diagram illustrating an example of processing for updating the neighboring cell list in the present embodiment. As shown in the figure, in each of the radio control units (RCUs) 2A to 2E, the communication unit 22 periodically or every time designated by the radio management unit (RMU) 1 every predetermined period. Traffic information transmitted / received by each antenna device 3 to / from the mobile terminal is transmitted to the radio management apparatus 1 (step S1).

  In the radio management apparatus 1, the resource allocation unit 13 determines the connection relationship between the radio control apparatus 2 and the antenna apparatus 3 based on the traffic information received from each radio control apparatus 2 (step S2). Further, the resource allocating unit 13 generates a switching signal corresponding to the determined connection relationship, and outputs the generated switching signal to the RCU table updating unit 14.

For example, the connection relationship is determined by changing the connection destination of the antenna device 3 when the sum of the traffic amount requested from the mobile terminal to the predetermined radio control device 2 becomes a threshold value or less. Here, since the traffic amount in the wireless control device 2C is equal to or greater than the threshold value and the traffic amount in the wireless control device 2B is equal to or less than the threshold value, the connection relationship for switching the antenna device 3c connected to the wireless control device 2C to the wireless control device 2B. The decision has been made.
The connection relationship may be determined by averaging the traffic volume in each radio control apparatus 2 or by preferentially processing the traffic in a predetermined radio control apparatus 2 (or cell). May be.

The RCU table update unit 14 updates the connected RRH list and the neighbor cell list stored in the RCU table 11 in accordance with the switching signal input from the resource allocation unit 13 (step S3).
The RCU table updating unit 14 sets the switching instruction signal for disconnecting the connection with the connected antenna apparatus 3c and the adjacent cell list to “B, E” for the radio control apparatus 2C that is the update target of the connection RRH list. The update instruction information to be updated to "" is transmitted (step S4).
The RCU table updating unit 14 updates the switching instruction signal for connecting the antenna device 3c and the adjacent cell list to “A, C, D” with respect to the radio control device 2B that is the update target of the connection RRH list. Instruction information is transmitted (step S5).
The RCU table updating unit 14 transmits update instruction information for changing the neighboring cell list to “B, E” to the radio network controller 2D that is not the updating target of the connected RRH list but is the updating target of the neighboring cell list. (Step S6).

In the wireless control devices 2B and 2C that have received the switching instruction signal, the communication unit 22 switches the connection of the antenna device 3c while cooperating with each other (step S7). At this time, the communication unit 22 provided in the wireless control device 2C and the communication unit 22 provided in the wireless control device 2B are switched so that the antenna device 3c is not simultaneously connected to both the wireless control devices 2C and 2B. I do.
The adjacent cell table update unit 23 provided in the radio control apparatus 2C transmits a signal notifying that the disconnection of the antenna device 3c is completed to the adjacent cell table update unit 23 provided in the radio control apparatus 2B. Then, the adjacent cell table update unit 23 provided in the radio network controller 2B may connect the antenna device 3c after receiving the signal. Each communication unit 22 may switch the antenna device 3c at the time set by the RCU table update unit 14.

In the wireless control devices 2B, 2C, and 2D that have received the update instruction information, the adjacent cell table update unit 23 updates the adjacent cell list stored in the adjacent cell table 21 based on the received update instruction information (Step S1). S8).
By the processing from step S1 to step S8 described above, the neighbor cell list is updated when the connection destination of the antenna device 3 is changed.
In step S4 and step S5 described above, the RCU table update unit 14 may transmit the switching instruction signal and the update instruction signal to each radio control apparatus 2 at different timings. Further, the transmission of the update instruction signal in step S6 may be performed before step S4 or step S5.

  Next, the process for updating the RCU table 11 in step S3 will be described in more detail. FIG. 7 is a flowchart of processing for updating the neighboring cell list and the connected RRH list in the present embodiment. Here, similarly to the description in FIG. 6, the connection relationship between the radio control device 2 and the antenna device 3 shown in FIG. 1 is changed to the connection relationship between the radio control device 2 and the antenna device 3 shown in FIG. A case will be described as an example.

In the radio management apparatus 1, the RCU table updating unit 14 stores the switching signal for switching the connection destination of the antenna apparatus 3c from the radio control apparatus 2C to the radio control apparatus 2B from the resource allocation unit 13 and is stored in the RRH table 12. The antenna devices 3b (hereinafter referred to as adjacent RRHs) whose communication areas are adjacent to the antenna device 3c whose connection destination is to be switched based on the adjacent RRH list are the antenna devices 3b, 3d, and 3g. Is detected (step S11).
Based on the connected RRH list stored in the RCU table 11, the RCU table update unit 14 detects the radio network controller 2 to which the adjacent RRH is connected (hereinafter referred to as the adjacent RCU). Here, the adjacent RCUs are the wireless control device 2B to which the antenna device 3b is connected, the wireless control device 2D to which the antenna device 3d is connected, and the wireless control device 2C to which the antenna device 3g is connected. However, the wireless control device 2B and the wireless control device 2C, which are targets for switching the connection of the antenna device 3c (hereinafter referred to as switching targets), are excluded from the adjacent RCUs. Therefore, the adjacent RCU is the radio control apparatus 2D. Further, the RCU table updating unit 14 selects the adjacent RCU, the radio control device 2C (switching source) to which the antenna device 3c is connected, and the radio control device 2B to which the connection of the antenna device 3c is switched in the adjacent cell list. The update target is selected (step S12).

Based on the adjacent RRH list stored in the RRH table 12 and the connected RRH list stored in the RCU table 11, the RCU table updating unit 14 and the radio control apparatuses 2B and 2C to be switched and the adjacent RCU list Is selected as an update target of the neighbor cell list, and the neighbor cell list associated with the radio control apparatus 2 selected as the update target is updated (step S13).
Specifically, the RCU table update unit 14 deletes the identifier of the antenna device 3c that switches the connection destination from the connection RRH list corresponding to the radio control device 2C that is the switching source of the antenna device 3c that switches the connection destination. The RCU table updating unit 14 adds the identifier of the antenna device 3c that switches the connection destination to the connection RRH list corresponding to the radio control device 2B that is the switching destination of the antenna device 3c that switches the connection destination.
Further, the RCU table updating unit 14 sequentially reads out the connection RRH list of the radio control device 2 to be updated from the connection RRH list stored in the RCU table 11, and the radio control device 2 corresponding to the read connection RRH list. Update the neighbor cell list for. The RCU table update unit 14 reads the adjacent RRH list of the antenna device 3 included in the read connection RRH list from the RRH table 12. Subsequently, the RCU table updating unit 14 detects the radio control device 2 connected to the antenna device 3 included in the read adjacent RRH list from the RCU table 11, and sets the detected radio control device 2 as an adjacent cell. Update the neighbor cell list. Note that the RCU table updating unit 14 prevents the own apparatus from being included in the neighboring cell list when updating the neighboring cell list.

For example, regarding the update of the adjacent cell list of the radio network controller 2B, the antenna devices 3 connected to the radio network controller 2B after switching are the antenna device 3b, the antenna device 3c, and the antenna device 3f, and are adjacent to the antenna device 3b. The RRHs are the antenna devices 3a, 3c, and 3f, the adjacent RRHs of the antenna device 3c are the antenna devices 3b, 3d, and 3g, and the adjacent RRHs of the antenna device 3f are the antenna devices 3b, 3e, and 3g. Among the adjacent RRHs, the antenna devices 3b, 3c, and 3f are antenna devices 3 that are connected to the radio control device 2B. Therefore, if they are excluded from the adjacent RRHs, the remaining adjacent RRHs are the antenna devices 3a, 3d, 3e, and 3g. Become.
Among the remaining adjacent RRHs, the antenna devices 3a and 3e are connected to the radio control device 2A, the antenna device 3d is connected to the radio control device 2D, and the antenna device 3g is connected to the radio control device 2C. As a result, the adjacent cell list of the wireless control device 2B is changed to “A, C, D” indicating the wireless control devices 2A, 2C, and 2D.
Similarly, the adjacent RRH is detected for the radio control apparatus 2C and the radio control apparatus 2D, and the adjacent cell list is updated based on the detected adjacent RRH.

By performing the processing from step S11 to step S13 described above, the RCU table 11 when the connection destination of the antenna device 3c is switched from the wireless control device 2C to the wireless control device 2B is changed as shown in FIG.
FIG. 8 is a diagram illustrating the RCU table 11 after the connection destination of the antenna device 3c is switched from the wireless control device 2C to the wireless control device 2B in the present embodiment. Comparing FIG. 8 with FIG. 3, “c” is added to the connection RRH list corresponding to the radio network controller 2B, and “D” is added to the neighboring cell list. Further, “c” is deleted from the connection RRH list corresponding to the radio network controller 2C, and “D” is deleted from the adjacent cell list. Further, “D” is changed to “B” in the adjacent cell list corresponding to the radio network controller 2D.

In the mobile communication system 100 that dynamically changes the connection relationship between the radio control apparatus 2 and the antenna apparatus 3, the radio management apparatus 1 includes a connection RRH list of each radio control apparatus 2 stored in the RCU table 11, and an RRH The neighboring cell list can be updated based on the neighboring RRH list of each antenna device 3 stored in the table 12.
Thereby, after changing the connection between the radio control apparatus 2 and the antenna apparatus 3, the neighbor cell list can be updated without measuring the signal strength in the mobile terminal. In addition, since the neighboring cell list can be updated before switching the connection of the antenna device 3, the neighboring cell list can be updated immediately before switching the connection destination, at the same time, or immediately after switching. The time lag between the previous switching and the neighbor cell list update can be shortened.

In addition, the wireless control device 2 shortens the difference between the timing of switching the antenna device 3 to be connected and the timing of notifying the updated neighboring cell list to the mobile terminal that communicates with the own device via the antenna device 3. It is possible to reduce a possibility that communication of the mobile terminal is disconnected without being able to perform handover correctly, and the stability of the mobile communication system 100 can be improved.
In addition, when updating the neighboring cell list, it is necessary to transmit and receive signal strength measurement results that occur when ANR is applied between the antenna device 3, the radio control device 2, the radio management device 1, and the mobile terminal. Therefore, overhead in communication resources can be reduced, and communication resources can be used efficiently.

  In addition, although the RCU table update part 14 demonstrated the structure which transmits the update content of an adjacent cell list to each radio | wireless control apparatus 2 in above-mentioned step S4 to step S6, it is not restricted to this, The adjacent cell after update The list may be transmitted to each wireless control device 2. In the present embodiment, the configuration in which the radio management apparatus 1 includes the RCU table 11 and the RRH table 12 individually has been described. However, the connection RRH list, the adjacent cell list, and the adjacent RRH list for each antenna apparatus 3 are stored. One storage unit (table) may be provided.

(Second Embodiment)
FIG. 9 is a schematic block diagram illustrating configurations of the wireless management device 5 and the wireless control device 2 according to the second embodiment. Note that the mobile communication system in the present embodiment includes a radio management apparatus 5 instead of the radio management apparatus 1 included in the mobile communication system 100 in the first embodiment, and a radio control apparatus 6 instead of the radio control apparatus 2. It has.

As shown in the figure, the radio management apparatus 5 includes a resource allocation unit 51, an RCU table 52, and an RCU table update unit 53. The resource allocation unit 51 determines the antenna device 3 connected to each radio control device 6 based on the traffic information received from each radio control device 6, and generates a switching instruction signal according to the determined connection relationship. The RCU table 52 stores connection RRH information and adjacent RRH information for each radio network controller 6 connected to the radio management apparatus 5.
Here, the connection RRH information is an identifier (RRH-ID) indicating the antenna device 3 connected to the radio network controller 6. The adjacent RRH information includes an identifier indicating another antenna device 3 having a communication area adjacent to a communication area included in the antenna device 3 connected to the radio control device 6, and a radio connected to the other antenna device 3. This information is a combination of an identifier (RCU-ID) indicating the control device 6.

The RCU table update unit 53 updates connection RRH information and adjacent RRH information stored in the RCU table 52. Further, the RCU table update unit 53 generates a neighbor cell list update instruction signal and transmits the generated neighbor cell list update signal to the radio network controller 6.
Here, the RRH information is information related to the antenna device 3 that switches the connection with the radio control device 6.

The radio network controller 6 includes an RRH table 61, an adjacent cell table 62, a communication unit 63, and an adjacent cell list update unit 64.
The RRH table 61 stores adjacent RRH information for each connection RRH information indicating the antenna device 3 connected to the own device.
The adjacent cell table 62 stores an adjacent cell list that is a list of identifiers (RCU-IDs) indicating other radio control apparatuses 6 that form cells adjacent to the cell of the own apparatus.
The communication unit 63 is connected to the antenna device 3 specified by the switching instruction signal input from the adjacent cell list update unit 64, and communicates with the mobile terminal via the connected antenna device 3. The communication unit 63 transmits traffic information transmitted / received by each antenna device 3 to / from the mobile terminal to the radio management device 5. In addition, the communication unit 63 reads the neighboring cell list stored in the neighboring cell table 62 and transmits the read neighboring cell list to the antenna device 3. In the antenna device 3, the adjacent cell list is transmitted to the mobile terminal using a broadcast channel or the like.
The adjacent cell list update unit 64 receives the switching instruction signal from the radio management apparatus 5, updates the connection RRH information and the adjacent RRH information stored in the RRH table 61 according to the received switching instruction signal, and updates the result. In response to this, the adjacent cell list stored in the adjacent cell table 62 is updated.

FIG. 10 is a diagram illustrating an example of connection RRH information and adjacent RRH information stored in the RCU table 52 in the present embodiment. The example shown in the figure corresponds to the connection relationship between the radio control apparatus and the antenna apparatus in FIG. The RCU table 52 stores connection RRH information and adjacent RRH information for each piece of information (RCU-ID) indicating the radio network controller 6.
For example, “B” indicating the wireless control device 6B, “b” and “f” indicating the antenna devices 3b and 3f connected to the wireless control device 6B, and adjacent RRH information “aA, c-C, f-B "and adjacent RRH information" b-B, e-A, g-C "for the antenna device 3f are associated with each other. Here, the identifiers (RRH-ID) of the antenna devices 3a to 3h are represented by “a” to “h”, and the identifiers (RCU-ID) of the radio control devices 6A to 6E are represented by “A” to “E”. Represents.

FIG. 11 is a diagram illustrating an example of connection RRH information and adjacent RRH information stored in the RRH table 61 according to the present embodiment. The connection RRH information and the adjacent RRH information shown in the figure correspond to the connection relationship between the radio control device and the antenna device shown in FIG. FIG. 11A shows connection RRH information and adjacent RRH information stored in the RRH table 61 provided in the radio network controller 6A. 11B to 11E show connection RRH information and adjacent RRH information stored in the RRH table 61 provided in each of the radio control apparatuses 6B to 6E, as in FIG. 11A. Is shown.
For example, in the RRH table 61 provided in the wireless control device 6B shown in FIG. 11B, “b” and “f” indicating the antenna devices 3b and 3f connected to the wireless control device 6B. Is stored as connection RRH information. The connection RRH information “b” includes, as neighboring RRH information, a combination of RRH-ID “a” and RCU-ID “A”, a combination of RRH-ID “c” and RCU-ID “C”, and RRH. -A combination of ID "f" and RCU-ID "B" is associated. Similarly, the connection RRH information “f” is associated with a combination of “b-B”, “e-A”, and “g-C”.

  Hereinafter, a process of updating the neighbor cell list stored in each radio control device 6 will be described with a specific example. Here, as illustrated in FIG. 5, the process of switching the connection destination of the antenna device 3 c connected to the wireless control device 6 </ b> C to the wireless control device 6 </ b> B is taken as an example, and the wireless management device 5 and the wireless control device 6. The operation will be described. That is, the operation when the connection relationship shown in FIG. 1 is changed to the connection relationship shown in FIG. 5 will be described.

  FIG. 12 is a sequence diagram illustrating a processing example of updating the adjacent cell list in the present embodiment. Here, similarly to the example shown in FIG. 6 in the first embodiment, the traffic amount in the radio control device 6C is equal to or greater than a predetermined threshold value, and the traffic amount in the radio control device 6B is equal to or less than the threshold value. The case where the antenna device 3c connected to the device 6C is switched to the radio control device 6B (when switching from the connection relationship shown in FIG. 1 to the connection relationship shown in FIG. 5) will be described as an example.

  As shown in FIG. 12, in each of the radio control units (RCU) 6A to 6E, the communication unit 63 periodically or every time designated by the radio management unit (RMU) 5 every predetermined period. The traffic information transmitted and received by each antenna device 3 with the mobile terminal is transmitted to the radio management device 5 (step S201).

  In the radio management apparatus 5, the resource allocation unit 51 determines a change in the connection between the radio control apparatus 6 and the antenna apparatus 3 based on the traffic information received from each radio control apparatus 6 (step S202). Further, the resource allocation unit 51 generates a switching instruction signal corresponding to the determined connection change, and transmits the generated switching instruction signal to the radio network controller 6C and the radio network controller 6B (step S203). The switching instruction signal transmitted in step S203 is a signal indicating that the connection destination of the antenna device 3c connected to the wireless control device 6C is switched to the wireless control device 6B.

  In the wireless control device 6C, the adjacent cell list update unit 64 outputs the received switching instruction signal to the communication unit 63, and causes the communication unit 63 to disconnect from the antenna device 3c. Thereafter, in the radio network controller 6B, the adjacent cell list update unit 64 outputs the received switching instruction signal to the communication unit 63, and causes the communication unit 63 to connect to the antenna device 3c (step S204). At this time, the communication device 63 provided in the radio control device 6C and the communication unit 63 provided in the radio control device 6B cooperate with each other while the antenna device 3c is simultaneously connected to both the radio control devices 6B and 2C. Switch to prevent connection.

When the switching of the connection of the antenna device 3c is completed in the radio control device 6C that is the switching source of the antenna device 3c, the adjacent cell list update unit 64 updates the connection RRH information and the adjacent RRH information stored in the RRH table 61. Then, the neighboring cell list stored in the neighboring cell table 62 is updated based on the update result (step S205).
The adjacent cell list updating unit 64 generates RRH information for the radio control device 6C that is the connection switching target, and transmits the generated RRH information to the radio control device 6B that is the switching destination of the antenna device 3c (step S206).

  In the radio network controller 6B that is the switching destination of the antenna device 3c, when the adjacent cell list update unit 64 receives the RRH information from the radio network controller 6C, the connection RRH stored in the RRH table 61 using the received RRH information. The information and the adjacent RRH information are updated, and the adjacent cell list stored in the adjacent cell table 62 is updated based on the update result (step S207).

In the radio management apparatus 5, the RCU table updating unit 53 updates the connection RRH information and the adjacent RRH information stored in the RCU table 52 based on the switching instruction signal generated in step S203.
Specifically, in the RCU table 52, the RCU table updating unit 53 includes connection RRH information (RRH-ID “c”) and adjacent RRH information (“b−” corresponding to the antenna device 3c to be switched indicated by the switching instruction signal. B, d-D, g-C ") and the RCU-ID" C "indicating the radio control apparatus 6C that is the switching source of the antenna apparatus 3c is deleted. In addition, the RCU table updating unit 53 includes, in the RCU table 52, the connection RRH information (RRH-ID “c”) and the adjacent RRH information (“b-B,”) corresponding to the switching target antenna device 3c indicated by the switching instruction signal. d-D, g-C ") are associated with the RCU-ID" B "indicating the radio control apparatus 6B to which the antenna apparatus 3c is switched. Further, the RCU table update unit 53 sets the RCU-ID “C” combined with the antenna device 3c to be switched among the adjacent RRH information stored in the RCU table 52 to the radio control device 6B that is the switching destination. Change to the indicated RCU-ID “B”.
The RCU table updating unit 53 receives the RRH information transmitted from the radio control apparatus 6C to the radio control apparatus 6B in step S206, and the connection RRH information stored in the RCU table 52 based on the received RRH information. And the adjacent RRH information may be updated.

The RCU table update unit 53 generates a neighbor cell list change instruction signal indicating that the antenna device 3c is connected to the radio control device 6B (step S208), and sends the generated neighbor cell list update signal to the RCU table 52. Among the wireless control devices 6 in which the stored adjacent RRH information has been changed, the information is transmitted to the wireless control device 6D other than the switching destination and the switching-source wireless control device 6 (step S209).
In the radio network controller 6D, when the neighbor cell list update unit 64 receives the neighbor cell list update instruction signal from the radio management apparatus 5, the neighbor cell list update unit 64 updates the neighbor RRH information stored in the RRH table 61 (step S210).
By the processing from step S201 to step S210 described above, the neighbor cell list is updated as the connection destination of the antenna device 3 is changed.

Hereinafter, the processes in step S205, step S207, and step S210 will be described in more detail.
FIG. 13 is a diagram illustrating a process (step S205) of updating the neighboring cell list of the switching source radio network controller 6 in the present embodiment.
FIG. 13A is a flowchart of the process of updating the adjacent cell list in the switching source radio network controller 6. FIG. 13B is a diagram illustrating before and after updating of the connection RRH information and the adjacent RRH information stored in the RRH table 61 of the radio network controller 6C.

In the radio network controller 6C, the neighboring cell list update unit 64 generates RRH information from the neighboring RRH information stored in the RRH table 61. The adjacent cell list update unit 64 includes the connection RRH information “c” indicating the antenna device 3c to be switched, and the adjacent RRH information (b−B, d−D, and g−C) corresponding to the RRH-ID “c”. ) Are deleted (step S211).
Here, the RRH information includes information (RRH-ID) indicating the antenna device 3 to be switched and adjacent RRH information corresponding to the antenna device 3. In this example, RRH-ID “c” as information indicating the antenna device 3 for switching connection, and “b-B, d-D, g-C” as adjacent RRH information corresponding to the RRH-ID “c”. Is included in the RRH information.

When the adjacent RRH information stored in the RRH table 61 includes the antenna device 3c for switching the connection, the adjacent cell list update unit 64 identifies the radio control device 6 combined with the antenna device 3c. (RCU-ID) is changed to the identifier of the switching destination radio network controller 6B. In this example, since the combination of “c-C” is included in the adjacent RRH information corresponding to the RRH-ID “g”, the combination is changed to “c-B” (step S212).
The neighbor cell list update unit 64 updates the neighbor cell list stored in the neighbor cell table 62 based on the neighbor RRH information stored in the updated RRH table 61. In this example, since the RCU-IDs of the radio network controller 6 included in the adjacent RRH information are “B” and “E”, the adjacent cell list update unit 64 updates the adjacent cell list after updating “B, E”. Is stored in the adjacent cell table 62 (step S213).

The adjacent cell list update unit 64 transmits the RRH information generated in step S211 to the radio control device 6 that is the switching destination of the antenna device 3 that switches the connection (step S214). Step S214 corresponds to step S206 in FIG.
By the processing from step S211 to step S213 described above, the neighbor cell list in the switching source radio network controller 6C is updated as shown in FIG. 13B.

FIG. 14 is a diagram illustrating processing (step S207) for updating the neighboring cell list of the switching destination radio network controller 6 in the present embodiment.
FIG. 14A is a flowchart of the process of updating the neighboring cell list in the switching destination radio network controller 6. FIG. 14B is a diagram illustrating before and after updating of the connection RRH information and the adjacent RRH information stored in the RRH table 61 of the radio network controller 6B.

In the radio control apparatus 6B, when the neighboring cell list update unit 64 receives RRH information from the radio control apparatus 6C that is the switching source of the antenna apparatus 3c that switches the connection (step S221), the RRH-ID included in the received RRH information. And the adjacent RRH information are added to the connection RRH information and the adjacent RRH information stored in the RRH table 61 (step S222).
When the RRH-ID included in the received RRH information is included in the adjacent RRH information stored in the RRH table 61, the adjacent cell list update unit 64 sets the RCU-ID combined with the RRH-ID. Then, the RCU-ID indicating the switching destination radio network controller 6 is changed. In this example, “c-C” included in the adjacent RRH information corresponding to the RRH-ID “b” is changed to “c-B” (step S223).

The neighbor cell list update unit 64 updates the neighbor cell list stored in the neighbor cell table 62 based on the neighbor RRH information stored in the updated RRH table 61. In this example, the RCU-IDs of the radio network controller 6 included in the adjacent RRH information are “A”, “B”, “C”, and “D”, and the adjacent cell list update unit 64 determines that the local device “B” "A, C, D" excluding "" is stored in the adjacent cell table 62 as an updated adjacent cell list (step S224).
As a result of the processing from step S221 to step S224 described above, the neighboring cell list in the switching-destination radio control apparatus 6B is updated as shown in FIG.

FIG. 15 is a diagram illustrating processing (step S210) for updating the neighboring cell list of the radio network controller 6 that requires updating of the neighboring cell list in the present embodiment.
FIG. 15A is a flowchart of a process of updating the neighbor cell list in the radio control apparatus 6 other than the switching destination and the switching source of the antenna apparatus 3. FIG. 15B is a diagram illustrating before and after updating of the connection RRH information and the adjacent RRH information stored in the RRH table 61 of the radio network controller 6D.

  In the radio network controller 6D, when receiving the neighbor cell list update instruction signal from the radio management apparatus 5 (step S231), the neighbor cell list update unit 64 stores the neighbor cell list update instruction signal in the RRH table 61 based on the received neighbor cell list update instruction signal. Updated adjacent RRH information. In this example, based on the fact that the connection destination of the antenna device 3c is the radio control device 6B indicated by the adjacent cell list update instruction signal, the radio control device 6 combined with the antenna device 3c included in the adjacent RRH information. The RCU-ID is changed to “B” (step S232).

The neighbor cell list update unit 64 updates the neighbor cell list stored in the neighbor cell table 62 based on the neighbor RRH information stored in the updated RRH table 61. In this example, since the RCU-IDs of the radio network controller 6 included in the adjacent RRH information are “B” and “E”, the adjacent cell list update unit 64 updates the adjacent cell list after updating “B, E”. Is stored in the adjacent cell table 62 (step S233).
By the processing from step S231 to step S233 described above, the neighbor cell list in the radio control device 6D other than the switching source and the switching destination is updated as shown in FIG.

  FIG. 16 is a diagram illustrating the RCU table 52 after the connection destination of the antenna device 3c is switched from the wireless control device 6C to the wireless control device 6B in the present embodiment. 16 and FIG. 10, RRH-ID “c” of the connection RRH information is associated with the RCU-ID “B” of the radio network controller 6B, and the adjacent RRH information of the RRH-ID “c” is RCU- It is associated with the ID “B”. Also, in the adjacent RRH information of RRH-ID “b”, the adjacent RRH information of RRH-ID “g”, and the adjacent RRH information of RRH-ID “d”, “c-C” becomes “c-B”. has been changed.

As described above, in the mobile communication system that dynamically changes the connection relationship between the radio control device 6 and the antenna device 3, when the radio control device 6 receives the switching instruction signal for switching the connection of the antenna device 3, the RRH table. Based on the connection RRH information and the neighboring RRH information stored in 61, the neighboring cell list stored in the neighboring cell table 62 can be updated. In addition, the wireless control device 6 that has received the switching instruction signal transmits information (RRH information) about the antenna device 3 that switches the connection destination to the wireless management device 5. When the radio management apparatus 5 receives the RRH information, among the radio control apparatuses 6 that do not receive the switching instruction signal, the radio management apparatus 5 switches the connection of the antenna apparatus 3 so that the adjacent cell list needs to be updated. An adjacent cell list update instruction signal is transmitted. The radio network controller 6 that has received the neighbor cell list update instruction signal updates the neighbor cell list and updates the neighbor RRH information stored in the RRH table 61 based on the received neighbor cell list update instruction signal. Can do.
Thereby, after changing the connection between the radio control device 6 and the antenna device 3, the adjacent cell list can be updated without measuring the signal strength at the mobile terminal. Since the list can be updated, the time lag between the switching of the connection destination and the update of the adjacent cell list can be shortened.
Further, after changing the connection between the radio control device 6 and the antenna device 3, it is possible to update the adjacent cell list without measuring the signal strength at the mobile terminal, and between the antenna device 3 and the radio control device 6. The overhead that occurs when switching the connections and updating the neighbor cell list can be reduced.

(Third embodiment)
FIG. 17 is a schematic block diagram illustrating configurations of the wireless management device 7 and the wireless control device 8 according to the third embodiment. The mobile communication system according to the present embodiment includes a wireless management device 7 instead of the wireless management device 1 included in the mobile communication system 100 according to the first embodiment, and a wireless control device 8 instead of the wireless control device 2. It has. Moreover, in the same figure, the same code | symbol is attached | subjected to the same function part as the function part in 2nd Embodiment, and the description about the said function part is abbreviate | omitted.

  As shown in the figure, the radio management apparatus 7 includes a resource allocation unit 51, an RCU table 52, and an RCU table update unit 73. The RCU table update unit 73 updates the connection RRH information and the adjacent RRH information stored in the RCU table 52 based on the switching instruction signal generated by the resource allocation unit 51. Further, the RCU table update unit 73 generates RRH information from the updated connection RRH information and adjacent RRH information, and transmits the generated RRH information and a switching instruction signal to the switching destination and the switching source radio control apparatus 8. Also, the RCU table update unit 73 receives the neighbor cell update instruction signal and updates the neighbor RRH information.

  The radio network controller 8 includes an RRH table 61, an adjacent cell table 62, a communication unit 63, and an adjacent cell list update unit 84. The adjacent cell list update unit 84 updates the connection RRH information and the adjacent RRH information stored in the RRH table 61 based on the switching instruction signal and the RRH information received from the radio management apparatus 7. Further, the neighboring cell list update unit 84 updates neighboring RRH information stored in the RRH table 61 based on a neighboring cell list update instruction signal received from another radio control device 8. Further, the neighbor cell list update unit 84 updates the neighbor cell list stored in the neighbor cell table 62 according to the update result of the neighbor RRH information.

  Hereinafter, a process of updating the neighbor cell list stored in each radio control device 8 will be described with a specific example. Here, as shown in FIG. 5, the process of switching the connection destination of the antenna device 3c connected to the radio control device 8C to the radio control device 8B is taken as an example, and the radio management device 7 and the radio control device 8 The operation will be described. That is, the operation when the connection relationship shown in FIG. 1 is changed to the connection relationship shown in FIG. 5 will be described.

  FIG. 18 is a sequence diagram illustrating an example of processing for updating the adjacent cell list in the present embodiment. Here, similarly to the example shown in FIG. 6 in the first embodiment, the traffic amount in the radio control device 8C is equal to or greater than a predetermined threshold value, and the traffic amount in the radio control device 8B is equal to or less than the threshold value. The case where the antenna device 3c connected to the device 8C is switched to the radio control device 8B will be described as an example. Further, it is assumed that the connection RRH information and the adjacent RRH information stored in the RCU table 52 are in the state shown in FIG.

As shown in FIG. 18, in each of the radio control units (RCU) 8A to 8E, the communication unit 63 periodically or every time designated by the radio management unit (RMU) 1 every predetermined period. The traffic information transmitted / received by each antenna device 3 to / from the mobile terminal is transmitted to the radio management device 7 (step S301).
In the radio management apparatus 7, the resource allocation unit 51 determines a connection change for switching the connection destination of the antenna apparatus 3c from the radio control apparatus 8C to the radio control apparatus 8B based on the traffic information received from each radio control apparatus 8. (Step S302).

The RCU table update unit 73 updates the connection RRH information and the adjacent RRH information stored in the RCU table 52 based on the connection change determined by the resource allocation unit 51. Specifically, the RCU table updating unit 73 includes, in the RCU table 52, RRH-ID “c” indicating the antenna device 3c to be switched and adjacent RRH information “b-B, d-D, g-C”, The correspondence with the RCU-ID “C” indicating the radio control apparatus 8C as the switching source is deleted. In addition, the RCU table updating unit 53 stores the RRH-ID “c” indicating the antenna device 3c to be switched and the adjacent RRH information “b-B, d-D, g-C” in the RCU table 52 as the switching destination. Corresponding to RCU-ID “B” indicating radio control apparatus 8B. Further, the RCU table updating unit 53 sets the RCU-ID combined with the switching target antenna device 3c among the adjacent RRH information stored in the RCU table 52 to the RCU- indicating the switching destination radio control device 8B. Change to ID “B”.
The RCU table updating unit 73 generates RRH information including information indicating the antenna device 3c to be switched and adjacent RRH information corresponding to the antenna device 3c (step S303), and switches the generated RRH information and the switching instruction signal. The data is transmitted to the destination and switching source radio control apparatuses 8B and 8C (step S304).

  In the radio control device 8C, the adjacent cell list update unit 84 outputs the received switching instruction signal to the communication unit 63, and causes the communication unit 63 to disconnect from the antenna device 3c. Thereafter, in the radio network controller 8B, the adjacent cell list update unit 84 outputs the received switching instruction signal to the communication unit 63, and causes the communication unit 63 to connect to the antenna device 3c (step S305).

When the switching of the connection of the antenna device 3c is completed in the radio control device 8C, the adjacent cell list update unit 84 uses the RRH-ID “c” indicating the antenna device 3c from the connection RRH information stored in the RRH table 61. Then, the connection RRH information corresponding to the antenna device 3c is deleted and updated, and the adjacent cell list stored in the adjacent cell table 62 is updated based on the update result. By this update, the RRH table 61 becomes the state shown in FIG.
Further, in the radio control device 8B, when the switching of the connection of the antenna device 3c is completed, the neighboring cell list update unit 84 adds the RRH-ID included in the RRH information to the connection RRH information stored in the RRH table 61. “C” is added, and the adjacent RRH information stored in the RRH table 61 is not updated to add the adjacent RRH information included in the RRH information, and is stored in the adjacent cell table 62 based on the update result. Update the adjacent cell list. By this update, the RRH table 61 is in the state shown in FIG. 14B (step S306).

  In the radio control apparatus 8B that is the switching destination, the adjacent cell list update unit 84 is not directly involved in switching the connection of the antenna apparatus 3c based on the adjacent RRH information stored in the updated RRH table 61. An adjacent cell list update instruction signal is transmitted to the radio network controller 8D that needs to update the cell list (step S307). The adjacent cell list update signal in step S307 is a signal indicating that the antenna device 3c is connected to the radio control device 8B.

In the radio controller 8D, when receiving the neighbor cell list update instruction signal from the radio controller 8B, the neighbor cell list update unit 84 updates the neighbor RRH information stored in the RRH table 61 (step S308). Note that the update of the adjacent cell list in step S308 is performed in the same manner as the processing shown in FIG.
By the processing from step S301 to step S308 described above, the neighbor cell list is updated as the connection destination of the antenna device 3 is changed.
In step S307, the switching-destination radio control apparatus 8B transmits an adjacent cell list update instruction to the radio control apparatus 8D. However, the switching-source radio control apparatus 8C performs radio control on the adjacent cell list update instruction signal. You may make it transmit to apparatus 8D.

As described above, in the mobile communication system that dynamically changes the connection relationship between the radio control device 8 and the antenna device 3, the radio control device 8 receives the switching instruction signal for switching the connection of the antenna device 3 and the RRH information. Then, the connection RRH information and the adjacent RRH information stored in the RRH table 61 can be updated, and the adjacent cell list can be updated from the update result. In addition, the wireless control device 8 that has received the switching instruction signal is directed to the wireless control device 8 that needs to update the neighboring cell list by switching the connection of the antenna device 3 among the wireless control devices 8 that do not receive the switching instruction signal. Then, an adjacent cell list update instruction signal is transmitted. The radio control apparatus 8 that has received the neighbor cell list update instruction signal updates the neighbor RRH information stored in the RRH table 61 and updates the neighbor cell list based on the received neighbor cell list update instruction signal. Can do.
Thereby, after changing the connection between the radio control device 8 and the antenna device 3, the adjacent cell list can be updated without measuring the signal strength at the mobile terminal. Since the list can be updated, the time lag between the switching of the connection destination and the update of the adjacent cell list can be shortened.
Further, after changing the connection between the radio control device 8 and the antenna device 3, it is possible to update the adjacent cell list without measuring the signal strength at the mobile terminal, and between the antenna device 3 and the radio control device 8. The overhead that occurs when switching the connections and updating the neighbor cell list can be reduced.

In the second and third embodiments, the configuration in which the connection RRH information and the adjacent RRH information are stored in the RCU table 52 has been described. However, the present invention is not limited to this, and the connection RRH information and the adjacent RRH information are stored in separate tables ( Or you may make it memorize | store in a memory | storage part.
The adjacent antenna device list in the present invention corresponds to the adjacent RRH list in the above-described embodiment. The connected antenna device list in the present invention corresponds to the connected RRH list in the above-described embodiment. The adjacent antenna device information in the present invention corresponds to the adjacent RRH information in the above-described embodiment. The table update unit in the present invention corresponds to the RCU table update unit in the above-described embodiment. The first table unit and the second table unit in the present invention correspond to the RCU table and the RRH table in the first embodiment, and the RCU table in the second and third embodiments.

  The RCU table is recorded by recording a program for realizing the functions of the wireless management apparatus 1 in the present invention on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium. 11, the RRH table 12, the resource allocation unit 13, and the RCU table update unit 14 may perform processing. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

1, 5, 7... Wireless management device 2, 2A, 2B, 2C, 2D, 2E, 6, 6A, 6B, 6C, 6D, 6E, 8, 8A, 8B, 8C, 8D, 8E. 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h ... antenna device 11, 52 ... RCU table 12, 61 ... RRH table 13, 51 ... resource allocation unit 14, 53, 73 ... RCU table update unit 21, 62 ... Neighboring cell tables 22, 63 ... Communication unit 23 ... Neighboring cell table updating unit 64, 84 ... Neighboring cell list updating unit 100 ... Mobile communication system 101 ... Aggregation center 102 ... Packet gateway 103 ... Packet core

Claims (9)

A plurality of antenna devices that perform wireless communication with a mobile terminal, a plurality of radio control devices that control the antenna devices, and a radio management device that manages a connection relationship between the antenna devices and the radio control devices A radio management apparatus in a mobile communication system,
A first table unit storing a connected antenna device list indicating the antenna devices connected to each of the radio control devices;
A second table section storing a list of adjacent antenna devices indicating adjacent antenna devices that are other antenna devices having a communication area adjacent to a communication area of the antenna device for each antenna device;
In response to a switching signal indicating switching of connection between the antenna apparatus and the radio control apparatus, the connected antenna apparatus list is updated, and the other radio control having an adjacent communication area for each radio control apparatus A table updating unit that updates a neighboring cell list indicating a device based on the switching signal, the neighboring antenna device list, and the updated connected antenna device list ;
Equipped with a,
The table updating unit is configured to update the adjacent cell list stored in the radio control apparatus and a switching instruction signal that instructs switching of the connection between the antenna apparatus and the radio control apparatus indicated by the switch signal. An update instruction signal to be updated based on the cell list is transmitted to the radio control device.
A wireless management device. The radio management apparatus according to claim 1,
The table update unit
The information indicating the antenna device that switches the connection destination is deleted from the connected antenna device list corresponding to the radio control device to which the antenna device is connected, and the radio control device that newly connects the antenna device is supported. Add information indicating the antenna device to the list of connected antenna devices to be
An adjacent antenna device of the antenna device included in the connected antenna device list corresponding to the wireless control device is detected from the adjacent antenna device list, and indicates the other wireless control device connected to the detected adjacent antenna device. A radio management apparatus characterized in that information is made into an updated neighbor cell list. The radio management apparatus according to claim 2,
The table update unit
Detecting the adjacent antenna device of the antenna device that switches the connection destination indicated by the switching signal from the adjacent antenna device list;
Detecting the radio control device connected to the detected adjacent antenna device from the connected antenna device list;
The detected radio control apparatus and the switching signal are targets for updating an adjacent cell list indicating another radio control apparatus connected to an adjacent antenna apparatus of the antenna apparatus connected to the radio control apparatus. A radio management apparatus comprising: selecting the radio control apparatus to which an antenna apparatus that switches a connection destination to be connected is connected and the radio control apparatus to which the antenna apparatus is newly connected. The radio management apparatus according to claim 3,
The table update unit further includes:
After updating the neighboring cell list, the updated neighboring cell list is transmitted to the radio control apparatus selected as the update target. The radio management apparatus according to claim 1,
The table update unit further includes:
Detecting the adjacent antenna device of the antenna device that switches the connection destination indicated by the switching signal from the adjacent antenna device list;
Detecting the radio control device connected to the detected adjacent antenna device from the connected antenna device list;
Of the detected radio control devices, radio control devices excluding the radio control device to which the antenna device that switches the connection destination indicated by the switching signal is connected and the radio control device that newly connects the antenna device In addition, an update instruction signal indicating the antenna device that switches the connection destination and the radio control device that is the switching destination of the antenna device is transmitted. The radio management apparatus according to claim 1,
The table update unit further includes:
A switching instruction signal including an adjacent antenna device list corresponding to an antenna device that switches a connection destination indicated by the switching signal, and information indicating the radio control device connected to the antenna device included in the adjacent antenna device list; And transmitting to the radio control apparatus that is the switching source and switching destination of the antenna apparatus. For each of a plurality of antenna devices that perform wireless communication with a mobile terminal, an adjacent antenna device list indicating adjacent antenna devices that are other antenna devices having a communication area adjacent to the communication area of the antenna device is stored. And a first table storing a connected antenna device list indicating the antenna device connected to each of a plurality of radio control devices that control the antenna device. A wireless management method in an apparatus, comprising:
In response to a switching signal indicating switching of connection between the antenna apparatus and the radio control apparatus, the connected antenna apparatus list is updated, and the other radio control having an adjacent communication area for each radio control apparatus A table update step of updating a neighboring cell list indicating a device based on the switching signal, the neighboring antenna device list, and the updated connected antenna device list ;
The switching instruction signal for instructing switching of the connection between the antenna apparatus and the radio control apparatus indicated by the switch signal, and the adjacent cell list stored in the radio control apparatus are updated based on the updated adjacent cell list. An instruction step of transmitting an update instruction signal to the radio network controller;
A wireless management method comprising: For each of a plurality of antenna devices that perform wireless communication with a mobile terminal, an adjacent antenna device list indicating adjacent antenna devices that are other antenna devices having a communication area adjacent to the communication area of the antenna device is stored. And a first table storing a connected antenna device list indicating the antenna device connected to each of a plurality of radio control devices that control the antenna device. In the computer provided in the device,
In response to a switching signal indicating switching of connection between the antenna apparatus and the radio control apparatus, the connected antenna apparatus list is updated, and the other radio control having an adjacent communication area for each radio control apparatus A table update step of updating a neighboring cell list indicating a device based on the switching signal, the neighboring antenna device list, and the updated connected antenna device list ;
The switching instruction signal for instructing switching of the connection between the antenna apparatus and the radio control apparatus indicated by the switch signal, and the adjacent cell list stored in the radio control apparatus are updated based on the updated adjacent cell list. An instruction step of transmitting an update instruction signal to the radio network controller;
A program for running A plurality of antenna devices that perform wireless communication with a mobile terminal, a plurality of radio control devices that control the antenna devices, and a radio management device that manages a connection relationship between the antenna devices and the radio control devices A mobile communication system,
The radio management device
A first table unit storing a connected antenna device list indicating the antenna devices connected to each of the radio control devices;
A second table section storing a list of adjacent antenna devices indicating adjacent antenna devices that are other antenna devices having a communication area adjacent to a communication area of the antenna device for each antenna device;
Other said radio control apparatus which updates the said connection antenna apparatus list | wrist according to the switching signal which shows the switching of the connection of the said antenna apparatus and the said radio control apparatus, and has the adjacent communication area for every said radio control apparatus A table update unit that updates the adjacent cell list indicating the switching signal, the adjacent antenna device list, and the updated connected antenna device list;
With
The table updating unit is configured to update the adjacent cell list stored in the radio control apparatus and a switching instruction signal that instructs switching of the connection between the antenna apparatus and the radio control apparatus indicated by the switch signal. An update instruction signal to be updated based on the cell list is transmitted to the radio control device.
A mobile communication system.

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