KR20070022323A - Autonomous cell formation method - Google Patents

Abstract

The autonomous cell formation method according to the present invention is an autonomous cell formation method for the radio base station to autonomously determine the radio frequency and the transmission power. For example, a newly installed radio base station 1 is installed without using radio wave information. On-demand collection of cell setting information including positional information of the base stations 2 and 3, transmission power information and radio frequency information, and based on the cell setting information of these neighboring base stations 2 and 3, And transmit power.

Description

Autonomous cell formation method {AUTONOMOUS CELL FORMATION METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an autonomous cell formation method for autonomously determining a transmission power and a radio frequency of a local station, and more particularly, to an autonomous cell formation method that can be executed even in a communication environment having poor reception sensitivity.

Hereinafter, the autonomous cell formation method in a prior art is demonstrated. In this case, it is assumed that the base station measures the reception level of the pilot channel transmitted from the neighboring base stations and notifies the notification channel of the transmission power value of the pilot channel.

The newly installed base station calculates peripheral cell arrangement information (distance to the neighboring base station and size of the neighboring cell) from the reception level value of the pilot channel of the neighboring base station and the transmission power value notified by the notification signal. Based on the arrangement information of the neighboring cells, the transmission power value is determined so that the cell area of the local station reaches the boundary of the neighboring cell area to form a cell.

Non-Patent Document 1: 2002 Proceedings of the Institute of Electronics and Information Sciences Conference B-5-70 "Proposal of Autonomous Cell Formation Method Based on Base Station Placement"

However, in the autonomous cell formation method described in the above-mentioned document, there is a problem that proper cell arrangement cannot be performed when the reception sensitivity is poor and radio waves from the neighboring base stations cannot be received.

This invention is made | formed in view of the above, and an object of this invention is to obtain the autonomous cell formation method which performs autonomous cell formation based on the cell formation information collected without using the information on a radio wave.

Disclosure of the Invention

The autonomous cell formation method according to the present invention is an autonomous cell formation method for a radio base station to autonomously determine radio frequency and transmission power, wherein a newly installed radio base station is a base station near an installation site without using radio wave information. A cell setting information collecting step of collecting on-demand cell setting information including location information, transmission power information, and radio frequency information of a neighboring base station; and based on the cell setting information of the neighboring base station, And determining cell setting information for determining a radio frequency and a transmission power of the cell.

According to the present invention, the cell setting information installed around the cell is collected autonomously on demand without using the radio wave information, and the transmission power and frequency of the own station are determined autonomously.

1 is a diagram showing a network configuration for realizing an autonomous cell forming method according to the present invention;

2 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 1;

3 is a diagram illustrating a relationship between location information and an IP address;

4 is a diagram showing a configuration example of an IP address;

5 is a diagram showing a configuration example of an IP address;

6 is a flowchart showing processing for determining a cell setting information of a local station by a newly installed wireless base station;

7 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 2;

8 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 3;

9 is a diagram showing a network configuration for realizing an autonomous cell forming method according to the present invention;

10 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 4;

11 is a diagram showing an example of the configuration of an IP address;

12 is a flowchart showing a process of graphically displaying cell setting information with respect to a maintenance device;

To practice the invention  Best form for

EMBODIMENT OF THE INVENTION Below, the Example of the autonomous cell formation method which concerns on this invention is described in detail based on drawing. In addition, this invention is not limited by this Example.

(Example 1)

1 is a diagram illustrating a network configuration for realizing an autonomous cell forming method according to the present invention. The network includes wireless base stations 1, 2, 3, router apparatus 4 having a router function, a center apparatus 5 for managing IP addresses of each wireless base station, and a maintenance device 6 for the maintainer of the network. It consists of). In addition, 1a, 2a, and 3a represent the cell areas of the radio base stations 1, 2 and 3, respectively, and 1b, 1c, 1d, 1e, 1f, and 1g respectively represent sector areas obtained by dividing the cell area 1a into six. Indicates. In addition, the radio base station 1 has an antenna having directivity, and enables radio waves to be adjusted to each of the sectors 1b to 1g. The wireless base stations 2 and 3 may also have a directional antenna in the same manner.

Subsequently, the autonomous cell forming method according to the present invention will be described in detail with reference to the drawings. 2 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 1. FIG. In this case, the radio base stations 2 and 3 are installed and connected to the center apparatus 5 via the router apparatus 4, on the premise that the cells 2a and 3a have been formed. In this state, a case where a new radio base station 1 is provided to form a cell 1a will be described. Hereinafter, in the autonomous cell formation method according to the present invention, each radio base station communicates with each radio base station and center device 5 via the router device 4.

First, in the radio base station 1, after being installed at an arbitrary place (FIG. 1, step S1), position information such as latitude and longitude of the local station installation place is determined by means of specifying a position such as GPS. Collect (step S2). The positional information may be set directly by the installer directly to the radio base station without using GPS or the like.

Next, the radio base station 1 loads the collected location information of the local station installation place and requests the center apparatus 5 for its own IP address (step S3). At this time, the IP address of the center device 5 may be set in advance in the radio base station 1, or the IP address may be automatically acquired using a protocol such as Bootp.

The center apparatus 5 which received the IP address request performs the process of assigning the IP address for the radio base station 1 based on the positional information of the radio base station 1 (step S4).

Here, the method of assigning the IP address in the center apparatus 5 will be described with reference to Figs. 3, 4 and 5. Fig. 3 is a diagram showing the relationship between the location information and the IP address, and shows a region A, an area B, an area C, and an area D, which are classified by latitude and longitude in a certain area. In this embodiment, as an example, the case where the newly installed wireless base station 1 is set to the area A is shown. 4 and 5 are diagrams showing an example of the configuration of the IP address. As an example, the address scheme of IPv6 is used. In Ipv6, 128 bits of information can be divided into 8 bits and expressed as 16 integers (A to P in the figure) (see FIG. 4). In the present embodiment, information specifying an area with any one of the 16 constants of the IP address and information indicating the serial number of the wireless base station in the area are indicated. As an example, two pieces of information indicated by the lower 16 bits are used as area information and base station serial number (see Fig. 5). In addition, as an area information value, it is assumed that the same value is allocated to the radio base station installed in the area.

The center apparatus 5 determines whether the radio base station 1 is installed in which area shown in FIG. 3 based on the latitude and longitude of the positional information sent from the radio base station 1 together with the IP address request. As a result of the determination, when it is determined that the installation location of the radio base station 1 is, for example, the area A, address information specifying the area A is set to the area information shown in FIG. In addition, the center apparatus 5 updates the base station serial number from the number of base stations set to the area A, sets the base station serial number for the wireless base station 1 to the base station serial number in FIG. Assign as address. The center apparatus 5 transmits the IP address to the radio base station 1, and the radio base station 1 registers the received IP address in its own station.

Next, the radio base station 1 detects the IP address of the radio base station (peripheral base station) installed in the periphery of the local station (step S5). Here, the detection method of the IP address of the surrounding base station is demonstrated concretely. Since the area information set to the IP addresses of neighboring base stations provided in the same area are common, changing the base station serial number of the IP address assigned to the own station becomes the IP address of the neighboring base stations. Therefore, the radio base station 1 regards the IP address to which the base station serial number of the IP address allocated from the center apparatus 5, for example, any one of 0 to 255, is assigned as the IP address of the neighboring base stations. . In this embodiment, the base station serial number is set to 8 bits, and is determined as the maximum value that can be represented by 8 bits.

Next, the radio base station 1 requests the cell setting information from the detected address of the neighboring base station (step S6). The cell setting information includes location information, transmission power information, and radio frequency information. Then, after making a request, the radio base station 1 starts a timer and waits for a response from the neighbor base stations.

Next, the radio base stations 2 and 3 for which cell setting information is requested return cell setting information of the local station to the radio base station 1 (step S7).

Finally, the radio base station 1 receives the cell setting information from the neighboring base stations while the timer is starting, and after timeout determines the cell setting information of the own station based on the cell setting information of the neighboring base stations (step S8). Fig. 6 is a flowchart showing the process of determining the cell setting information of the own station by the radio base station 1 of the new installation. Here, the determination processing of the cell setting information will be described in detail according to the flowchart of FIG. 6.

First, after determining the cell setting information, the radio base station 1 reads from the local station a determination range (distance from its own base station) that determines how far the radio base station is referred to from the local station (step S11). The information indicating this determination range may be set in advance by the installer before the radio base station is installed, or may be received from the center apparatus 5 at the time of the IP address request.

Next, the radio base station 1 picks up the cell setting information of the radio base station included in the determination range from the cell setting information of the neighboring base stations (step S12). Based on the positional information and the transmission power information of the picked-up cell setting information, the transmission power value of the local station is determined so that the radio wave reaching range of the local station is in contact with the radio wave reaching range of the neighboring base station (step S13). Specifically, the radio base station 1 determines the transmission power value of the sector 1b with reference to the transmission power information of the radio base station 2 based on the positional information of the neighboring base stations, and transmits the sector 1g. The power value is determined with reference to the transmission power information of the radio base station 3. For other sectors 1c, 1d, 1e, and 1f, since there is no neighboring base station, the maximum transmission power value that the wireless base station 1 can transmit is set.

Finally, the radio base station 1 determines the frequency information of the own station based on the frequency information of the cell setting information of the surroundings picked up (step S14). In addition, the method of determining the frequency is different depending on the radio communication method employed by the radio base station 1. For example, in the case of a system in which the same frequency as that of the neighboring base station cannot be used, such as PHS, the frequency is determined to be different from the frequency information of the surrounding cell setting information. In addition, in the case of a system that can use the same frequency as the neighboring base station such as W-CDMA, the frequency of the own station selects an arbitrary frequency.

As described above, in the present embodiment, it is assumed that cell setting information of the radio base stations installed in the periphery is collected autonomously on demand without using information on radio waves. As a result, it is possible to autonomously determine the transmission power and frequency of the local station regardless of the radio wave situation.

(Example 2)

7 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 2. FIG. In addition, the network configuration for realizing the autonomous cell formation method of this embodiment is the same as that of Fig. 1 of Embodiment 1 described above. Here, only the processing different from the above-described first embodiment will be described.

First, the radio base stations 2 and 3 already installed notify the center apparatus 5 of the cell setting information of the local station (step S21). The center device 5 registers the notified cell setting information to its own device (step S22).

Thereafter, when the radio base station 1 is newly installed, the radio base station 1 registers the IP address of the received local station by the same process as in the first embodiment described above (steps S1 to S4).

Next, the radio base station 1 notifies the center apparatus 5 of the determination range (same as in the first embodiment) of the local station, and requests cell setting information of the neighbor base stations (step S23). After receiving the request, the center apparatus 5 returns the cell setting information of the neighboring base stations of the radio base station 1 based on the positional information of the radio base station 1 and the determination range (step S24).

Finally, on the basis of the collected cell setting information, the radio base station 1 determines the cell setting information of the own station by the same processing as in the first embodiment (step S8).

As described above, in the present embodiment, it is assumed that the cell setting information of the radio base stations installed in the periphery is collectively collected from the center apparatus. As a result, the transmission power information and the frequency information of the local station can be determined autonomously regardless of the radio wave situation.

(Example 3)

Fig. 8 is a flowchart showing the autonomous cell forming method of the third embodiment. For example, the processing after the radio base station 1 determines the cell setting information of the own station in the processing of the first or second embodiment described above will be described. In addition, the network configuration for realizing the autonomous cell formation method of this embodiment is the same as that of Fig. 1 of Embodiment 1 described above. Here, only the processing different from the above-described embodiment 1 or 2 will be described.

For example, when the radio base stations 2 and 3 that have already been installed need to change their transmission power and frequency due to some factor (step S31), the radio base station transmits the cell setting information of the local station after the change to the surroundings. The radio base station 1 or the center apparatus 5 is notified (step S32).

 The center apparatus 5 which has been notified of the cell setting information registers the information in its own station (step S22). In addition, the surrounding radio base station 1 updates the cell setting information of the own station based on the new cell setting information (step S8).

As described above, in the present embodiment, it is assumed that the cell setting processing of the radio base station constituting the system is determined during radio base station operation, i.e., when a specific radio base station changes transmission power and frequency. The wireless base station notifies the neighboring base station of the cell setting information. Accordingly, the neighboring base station notified of the cell setting information can autonomously update the transmission power information and the frequency information.

(Example 4)

In the above embodiments, the autonomous cell formation method based on cell setting information collected at the time of radio base station installation and operation is described. In the fourth embodiment, the autonomous cell formation method when hierarchically installing the radio base station is provided. List it.

9 is a diagram illustrating a network configuration for realizing an autonomous cell forming method according to the present invention, and includes wireless base stations 11 to 16. 11a-14a has shown the cell area | region comprised by the radio base stations 11-14. In addition, 15a shows the cell area which the radio base station 15 comprises, and has hierarchical structure like overlapping with the cell areas 11a and 12a. Similarly, 16a indicates a cell area constituted by the radio base station 16, and has a hierarchical configuration such as overlapping with the cell areas 13a and 14a.

Subsequently, the autonomous cell forming method according to the present invention will be described in detail with reference to the drawings. 10 is a flowchart illustrating a method of forming an autonomous cell of Embodiment 4. FIG. Here, assuming that the radio base stations 11 to 14 and 16 have been installed, a case where a new radio base station 15 is installed in this state to form a cell 15a will be described. Here, only the processing different from the above-described embodiments will be described.

First, the newly installed wireless base station 15 collects the position information of the local station by the same process as in the first embodiment (steps S1 and 2).

Next, the radio base station 15 further specifies which layer to carry the location information of its own station, and requests an IP address from the center apparatus 5 (not shown) (step S41). For example, as shown in Fig. 9, this layer indicates the layer number of the cell area, as the radio base stations 11 to 14 are referred to as layer # 1, and the radio base stations 15 and 16 are referred to as layer # 2. . The layer number is set by the installer in the internal memory of the radio base station 15 when the radio base station 15 is installed.

The center apparatus 5, which has been requested for the IP address, sets the area information and the base station serial number based on the positional information of the radio base station 15, and further, based on the layer number, as shown in Fig. 11, the layer number information. By setting a, IP address assignment processing is executed (step S42). Fig. 11 is a diagram showing an example of the configuration of an IP address, which shows area information, layer number, and base station serial number as an example.

Next, the radio base station 15 assigned the IP address detects the IP address of the neighboring base station from the IP address (step S43). However, as the selection condition of the neighboring base stations, the area information and the layer number are common, and IP addresses having different base station serial numbers are targeted for the neighboring base stations. In FIG. 9, the neighbor base station of the radio base station 15 is the radio base station 16.

Thereafter, the radio base station 15 requests the cell setting information by the same processing as in the first embodiment, and then determines the cell setting information of the local station (steps S6 to S8). In addition, in this embodiment, the cell setting information of the neighboring base stations may be collected from the center apparatus 5 by the same processing as that of the second embodiment.

As described above, in the present embodiment, it is assumed that cell setting information of the wireless base station located in the same layer is collected from the wireless base stations installed in the periphery. As a result, the transmission power and frequency of the local station can be determined autonomously, and cells of any number of layers can be formed.

(Example 5)

In the fifth embodiment, processing for displaying the cell setting information determined in each of the above-described embodiments in a table with respect to the maintenance device possessed by the maintenance worker will be described. In addition, the network configuration of this embodiment is the same as that of Fig. 1 or 9 of the first embodiment (the router apparatus 4, the center apparatus 5, and the repair apparatus 6 are arranged in the same manner as in Fig. 1). It is the same. Here, only the processing different from the above-described embodiment 1 or 2 will be described.

Fig. 12 is a flowchart showing a process of graphically displaying the cell setting information with respect to the maintenance device.

First, the maintenance device 6 sets the positional information of the area for which the cell arrangement status is to be known (step S51). Then, the maintenance device 6 in which the positional information is set executes the above-described processes of steps S3 to S7, and collects cell setting information of neighboring base stations in the area (steps S3 to S7).

Finally, in the maintenance apparatus 6, based on the collected cell setting information, for example, a circle having a radius of the radio wave range as a radius based on the transmission power information based on the position of each radio base station (Fig. 1, 9) is displayed on the screen as the installation state of the cell around the set area (step S52).

As described above, in this embodiment, it is possible to easily recognize the arrangement status of the cells formed by the respective radio base stations autonomously in any area.

As described above, the autonomous cell formation method according to the present invention is useful as a technique for autonomously determining the transmission power and radio frequency of a local station, and is particularly suitable as an autonomous cell formation method that can be executed even in a communication environment having poor reception sensitivity between base stations. Do.

Claims (7)

In the autonomous cell formation method for the radio base station to autonomously determine the radio frequency and transmit power, Cell setting information collecting step of newly installed wireless base station collecting on-demand cell setting information including location information, transmission power information and radio frequency information of base station (near base station) around the installation site without using radio wave information Wow, A cell setting information determining step of determining a radio frequency and a transmission power of a local station based on cell setting information of the neighboring base station; Autonomous cell formation method comprising a. The method of claim 1, The cell setting information collecting step, A location information generation step of generating, by the newly installed wireless base station, location information of a local station installation location; An address requesting step of notifying the location information and requesting the address of the own station, to the center apparatus which manages the address of each radio base station constituting the network; An address registration step of registering an address including area information for specifying an installation location assigned by the center apparatus and base station serial number information indicating a serial number of a wireless base station in the area; An address detecting step of detecting an address of a neighboring base station based on the base station serial number information of the assigned address; Including, Collecting cell configuration information of the neighboring base station to which the detected address is allocated directly from each neighboring base station via a router device. Autonomous cell formation method, characterized in that. The method of claim 1, The cell setting information determination step, A transmission power determining step of determining the transmission power of the local station so that the radio wave reaching range of the local station is in contact with the radio wave reaching range of the neighboring base station based on the positional information and the transmission power information included in the cell setting information of the neighboring base station; Frequency determining step of determining the radio frequency of the own station based on radio frequency information included in the cell configuration information of the neighboring base station Autonomous cell formation method comprising a. The method of claim 1, The cell setting information collecting step, A location information generation step of generating, by the newly installed wireless base station, location information of a local station installation location; An address requesting step of notifying the location information and requesting the address of the own station, to the center apparatus which manages the address of each radio base station constituting the network; An address registration step of registering an address including area information for specifying an installation location assigned by the center apparatus and base station serial number information indicating a serial number of a wireless base station in the area; An address detecting step of detecting an address of a neighboring base station based on the base station serial number information of the assigned address; Including, Collecting cell setting information of the neighboring base station to which the detected address is allocated from the center apparatus via a router apparatus; Autonomous cell formation method, characterized in that.  The method of claim 1, The already installed wireless base station updates the cell setting information of the local station based on the new cell setting information after the change when the neighboring base station changes the transmission power and the radio frequency. The method of claim 1, When hierarchically installing each wireless base station constituting the network, The cell setting information collecting step, A location information generation step of generating, by the newly installed wireless base station, location information of a local station installation location; An address requesting step of notifying the location information and the hierarchy of the local station and requesting the address of the local station to the center apparatus which manages the address of each radio base station constituting the network; An address for registering an address including area information for assigning an installation location assigned by the center apparatus, base station serial number information indicating a serial number of a wireless base station in the area, and layer information for identifying the layer. Registration step, An address detecting step of detecting an address of a neighboring base station having the area information and the layer information in common based on base station serial number information of the assigned address; Including, Collecting cell setting information of the neighboring base station to which the detected address is allocated via a router device Autonomous cell formation method, characterized in that. The method of claim 1, An autonomous cell characterized in that a maintenance device for managing a network collects on-demand cell setting information of neighboring base stations of a specific area without using radio wave information, and displays the installation status of cells around the specific area on a screen. Forming method.

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