JP2014033343A - Radio communication system, management device, and base station management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce time, labor and costs for installing a base station.SOLUTION: In a radio communication system, a control device 3 comprises: a radio parameter list 32 which stores base station IDs including area information on areas into which a management area is divided and radio parameters for a base station device 2; a radio parameter assignment unit 33 which assigns the radio parameters according to a distance between base stations on the basis of the base station ID in the radio parameter list 32; and a network communication unit 31 which transmits the assigned radio parameters to the base station device 2. The base station device 2 comprises: a network communication unit 21 which receives the radio parameters transmitted from the control device 3; and a radio parameter setting unit 22 which sets the radio parameters.

Description

  Embodiments described herein relate generally to a wireless communication system, a management apparatus, and a base station management method for centrally managing a plurality of base stations.

  Conventionally, in wireless communication systems, station placement design has played an important role in coverage area and interference suppression. However, the transmission power value and radio frequency of the base station device must be determined in advance in consideration of the power value transmitted by the base station devices around the planned installation site in advance. Is a great effort.

  In order to solve this problem, a method is conceivable in which the terminal reports the transmission power value and interference information received by the terminal, and the radio frequency and transmission power value are determined using this information. However, this method is based on the premise that the base station device has already transmitted some radio waves, and the radio waves transmitted at this time cannot consider the influence on other base station devices. May adversely affect your service.

  In Patent Document 1, the base station apparatus measures the received electric field strength for each frequency while switching the radio frequency, detects the presence / absence of interference waves in the received radio wave of each radio frequency, and appropriately sets the radio communication environment. There has been proposed a base station apparatus that can be realized.

JP 2001-169338 A

  However, in the method of Patent Document 1, in the case of the FDD system, since the frequency band transmitted by the base station apparatus is different from the frequency band transmitted by the terminal, a radio frequency band newly received by the base station apparatus is mounted. This is not effective for a base station apparatus in which such a function is not implemented.

  An object of the present embodiment is to provide a wireless communication system, a management apparatus, and a base station management method that can reduce labor and cost in installing a base station.

  The wireless communication system according to the present embodiment is a wireless communication system including a plurality of base station devices installed in a management area and a management device that manages the base station device, wherein the management device includes the management device. Means for storing a radio parameter list storing identification information of a base station apparatus including area information obtained by dividing an area and radio parameters of the base station apparatus; and a distance between base stations based on the identification information of the radio parameter list. Means for allocating the radio parameter in response, and means for transmitting the allocated radio parameter to the base station apparatus, wherein the base station apparatus receives the radio parameter transmitted from the management apparatus; Means for setting the wireless parameter.

The figure which shows the structural example of the radio | wireless communications system which concerns on this embodiment. The block diagram which shows the function structure of each apparatus of the radio | wireless communications system of FIG. The figure which shows an example of a radio | wireless parameter list. The figure which shows the problem at the time of a base station establishment. The figure which shows the example which maps the base station ID and the position in which the base station was installed in Example 1. FIG. The figure which shows the other example which maps base station ID and the position in which the base station was installed. FIG. 3 is a sequence diagram illustrating wireless parameter list update processing according to the first embodiment. The figure which shows an example of the radio | wireless parameter list before base station new establishment. The figure which shows an example of the radio | wireless parameter list immediately after a base station establishment. The flowchart which shows the determination procedure of a radio frequency. The figure which shows an example of the radio | wireless parameter list after radio | wireless parameter adjustment. The figure which shows the cover area of each base station after radio | wireless parameter adjustment. The figure which shows the example which maps base station ID and the position in which the base station was installed in Example 2. FIG. FIG. 10 is a diagram illustrating an example of a wireless parameter list according to the second embodiment. The figure which shows the example which maps base station ID and the position in which the base station was installed in Example 3. FIG.

  Hereinafter, a radio communication system and a base station management method according to the present embodiment will be described with reference to the drawings.

  FIG. 1 shows a configuration example of a wireless communication system according to the present embodiment. This system includes terminals 1-1 to 1-m (hereinafter collectively referred to as terminal 1), base station apparatuses 2-1 to 2-n (hereinafter collectively referred to as base station apparatus 2), management apparatus 3, and maintenance equipment. A network and a communication network. The base station apparatus 2 performs wireless communication with the terminal 1 existing in the cover area. The management device 3 is connected to a plurality of base station devices 2 by wired or wireless lines. Furthermore, the management device 3 is connected to the maintenance network and the communication network, and is connected to the management server 4 via the maintenance network. The maintenance network and the communication network only need to be able to communicate arbitrarily between the apparatuses, and may be of any type such as an IP network or an ISDN network. In this system, it is possible to locally optimize the setting information of the base station device 2 by centrally managing the base station devices 2 under the control of the management device 3.

  FIG. 2 is a block diagram showing a functional configuration of each device of the wireless communication system of FIG. The base station device 2 includes a network communication unit 21, a radio parameter setting unit 22, and a radio unit 23. The management device 3 includes a network communication unit 31, a wireless parameter list 32, and a wireless parameter assignment unit 33. In addition, regarding the original function of the base station apparatus, it is assumed that it has a well-recognized function. The network communication unit 21 is connected to the network communication unit 31 of the management device 3.

  The management apparatus 3 has a radio parameter list 32 that stores radio parameters for each subordinate base station apparatus 2 connected to the management apparatus 3. Although details of the radio parameter list 32 will be described later, radio parameters (for example, radio frequency and transmission power value) of radio waves transmitted by each base station are included in this list. The radio parameter allocating unit 33 refers to the radio parameters included in the radio parameter list 32 to determine the radio frequency and transmission power value of the radio wave transmitted by each base station, and the base station device 2 via the network communication unit 31. Is notified of the radio frequency and transmission power value to be transmitted, and then the radio parameter list 32 is updated with the determined radio parameters.

  The base station device 2 receives the radio parameters including the radio frequency and the transmission power value notified from the management device 3 via the network communication unit 21, and sets the received radio parameters in the radio unit 2 by the radio parameter setting unit 22. And start sending radio waves.

  FIG. 3 is an example of the wireless parameter list 32. As shown in FIG. 3, the radio parameter list 32 includes a base station ID, a radio frequency, and a transmission power value. Note that the types of wireless parameters stored as a list can be arbitrarily changed according to the system to be applied.

  Next, the operation of the wireless communication system configured as described above will be described according to each embodiment.

Example 1
First, with reference to FIG. 4, the problem at the time of newly establishing a base station will be described. In FIG. 4, three base stations of base station apparatus A, base station apparatus B, and base station apparatus C are already installed in the management area of management apparatus 3, and another base station apparatus D is installed. Shows a case to try. In this system, three radio frequency bands α, β, and γ can be used. The radio frequency α is used by the base station apparatus A, the radio frequency β is used by the base station apparatus B, and the radio frequency γ is used by the base station apparatus C. Shall.

  If there is a radio frequency band that is not being used, simply using a radio frequency band that is not being used will not interfere with each other, and can be operated without affecting existing services. However, since there is no unused radio frequency band in the case of FIG. 4, it is necessary to calculate a radio frequency band and a transmission power value that do not affect other base station apparatuses. In general, this work is performed manually, and the labor required for this work has been a problem.

  FIG. 5 shows an example of mapping the base station ID and the position where the base station is installed in this system.

  In FIG. 5, the building managed by the management apparatus 3 is divided into 15 parts, 3 parts in the north-south direction and 5 parts in the east-west direction, and each divided area has a unique ID, and this ID is included in the base station ID. In this example, the area information in which the first two characters of the base station ID are set is shown, and the first character from the top indicates the position in the east-west direction, and the second character from the top indicates the position in the north-south direction. For example, the base station apparatus A belongs to the northernmost area and the westernmost area (area “A1”) managed by the management apparatus 3. The correspondence between the base station ID and the area is managed by the management device 3 in advance.

  Note that the lower four-digit ID other than this may be any character, may be used as other necessary information according to the system, and the number of digits can be changed. The base station ID is manually set from the position set by the installer when the base station is installed and the area information. For example, since the base station ID of the base station apparatus A belongs to the area “A1”, the base station ID starts from A1, and “A10001” with 0001 added after A1 is the first base station in the area. It is a base station ID.

  Further, the management device 3 calculates the weight of the distance between adjacent areas based on the size of the building and the number of divided areas. For example, if the building of FIG. 5 has a size of 30 m in the north-south direction and 50 m in the east-west direction, and is divided into 3 parts in the north-south direction and 5 parts in the east-west direction, the weight of the distance between adjacent areas is 1 respectively. . In this case, the weight of the distance between adjacent areas is east-west: north-south = 1: 1. In other words, a shift of one area in the north-south direction and a shift of one area in the east-west direction indicate that the received power is attenuated by the same amount.

  On the other hand, in FIG. 6, as in FIG. 5, the area of 30 m in the north-south direction and 50 m in the east-west direction is divided into three parts in the north-south direction and three parts in the east-west direction. The weight of the distance is east-west: north-south = 1.66: 1. That is, when the area is shifted by one in the north-south direction, the received power is attenuated by only weight 1, whereas when the area is shifted by one in the east-west direction, the received power is attenuated by weight 1.66. .

  The number of area divisions may be appropriately determined according to the system. If the area is divided finely, the position where the base station is installed can be expressed more accurately.

  The base station ID is an ID uniquely determined by the system, and is a type of parameter that can be acquired from the base station apparatus using a protocol such as SNMP (Simple Network Management Protocol). There is no need to implement the mechanism in the base station apparatus 2.

  From the above mechanism, the management device 3 can specify the approximate position where the base station is installed by referring to the base station ID. The management device 3 acquires the base station ID after the base station device 2 is started up, adds the base station ID to the radio parameter list 32, and reassigns the radio frequency band and the transmission power value by the radio parameter assignment unit 33.

  FIG. 7 is a sequence diagram showing the wireless parameter list update process. The management apparatus 3 receives the base station A installation completion notification (base station ID = A10001), adds the base station ID (A10001) to the radio parameter list 32, and the radio parameter assignment unit 33 causes the radio frequency and transmission power value to be added. Review. The base station A receives the notification of the radio parameters (radio frequency α, transmission power value 40) from the management device 3, sets the radio frequency α and transmission power value 40, and starts operation.

  Similarly, the management apparatus 3 receives the base station B installation completion notification (base station ID = B30001), adds the base station ID (B30001) to the radio parameter list 32, and the radio parameter assignment unit 33 causes the radio frequency and Review the transmission power value. The base station B receives the notification of the radio parameters (radio frequency β, transmission power value 40) from the management apparatus 3, sets the radio frequency β and transmission power value 40, and starts operation. Further, the management apparatus 3 receives the base station C installation completion notification (base station ID = D20001), adds the base station ID (D20001) to the radio parameter list 32, and the radio parameter assignment unit 33 transmits the radio frequency and transmission. Review the power value. The base station C receives the notification of the radio parameters (radio frequency γ, transmission power value 50) from the management apparatus 3, sets the radio frequency γ and transmission power value 50, and starts operation.

  In this operational state, the base station apparatus D is newly installed, and the management apparatus 3 receives a base station C installation completion notification (base station ID = E30001). The management device 3 adds the base station ID (B30001) to the radio parameter list 32, and the radio parameter allocation unit 33 reviews the radio frequency and transmission power value as follows.

  FIG. 8 is a wireless parameter list 32 held by the management apparatus 3 before the base station apparatus D in FIG. 4 is newly installed. The area division is considered to be divided into 5 × 3 as shown in FIG. At this stage, there are three base station apparatuses, each using a different radio frequency band, and at this stage, services can be provided without any interference with each other.

  FIG. 9 shows the radio parameter list 32 immediately after the base station apparatus D is newly installed. From this wireless parameter list 32, the management apparatus 3 knows that a new base station apparatus D has been placed in the area E3.

  A method for determining the radio frequency and transmission power value of the newly established base station apparatus D will be described below. First, it is determined from the radio frequency.

  FIG. 10 is a flowchart illustrating a method of determining a radio frequency when the base station apparatus D is newly placed.

  When there is no wireless frequency that is set in the target area among the available wireless frequencies (step S1: YES), the wireless parameter assignment unit 33 selects any wireless frequency that is not set. (Step S2). The selection method may be determined in a predetermined order or may be determined randomly.

  On the other hand, if all types of available radio frequencies are assigned to at least one of the base stations in the area and there is no radio frequency that is not assigned (step S1: NO), a certain base station must be Causes the same interference frequency. In order to suppress this interference problem, the radio parameter allocating unit 33 starts a search from the base station nearest to the position where the base station is installed, and selects the radio frequency of the farthest base station (step S3). In order to measure the distance, the distance weight between the areas held by the management apparatus 3 is used.

  For example, consider a case where the radio frequency of the base station apparatus D in FIG. 5 is determined. It is assumed that α, β, and γ can be used as radio frequencies in this system.

When the base station apparatus D is installed and its radio frequency is determined, the radio frequencies α, β, and γ have already been used by other base stations. For this reason, the radio frequency of “E30001” must be selected from α, β, and γ. Next, from “E30001”, the distance to the other base station is calculated, and the investigation is performed from the radio frequency of the nearest base station. In this example, the distances from the base station A, base station B, and base station C are as follows.

  From the above results, the nearest base station is the base station C, and the radio frequency used by this base station is γ. If the radio frequencies of the nearest base stations are the same, the influence of radio wave interference increases, so this radio frequency is excluded from the options. The next closest base station is base station B, and the radio frequency used by this base station is β. From the same idea as above, this radio frequency is also excluded from the options. Of the available radio frequencies at this time, the remaining radio frequency is α, and therefore α is selected as the radio frequency of the base station D.

  In the first embodiment, the procedure for determining the radio frequency shown in FIG. 10 is used, but important factors differ depending on the system. The above is merely an example, and the logic for determining the radio frequency is arbitrary.

  Thereafter, in consideration of interference with the base station apparatus A using the same radio frequency, transmission power values that do not interfere with each other are determined. The weight of the distance between the areas held by the management apparatus 3 is also used for determining the transmission power value. FIG. 11 shows a radio parameter list after the radio frequency and transmission power value are determined. In the case of FIG. 11, the transmission power value of the base station apparatus A is also lowered. Furthermore, since a dead zone may occur as the transmission power value of the base station apparatus A is lowered, the coverage area is secured by increasing the transmission power of the radio frequency β and the radio frequency γ.

  As shown in FIG. 7, the management device 3 notifies the determined radio parameters to each base station. Thereby, the base station A receives the notification of the radio parameters (radio frequency α, transmission power value 30) from the management device 3, sets the radio frequency α and transmission power value 30, and starts operation. The base station B receives the notification of the radio parameters (radio frequency β, transmission power value 50) from the management device 3, sets the radio frequency β and transmission power value 50, and starts operation. The base station C receives the notification of the radio parameters (radio frequency γ, transmission power value 60) from the management device 3, sets the radio frequency γ and transmission power value 60, and starts operation. The base station D receives the notification of the radio parameters (radio frequency α, transmission power value 30) from the management device 3, sets the radio frequency α and transmission power value 30, and starts operation.

  FIG. 12 shows the state of the coverage area of each base station after adjusting the radio parameters. By providing the management device 3 in this manner, it is possible to automatically determine the radio frequency and the transmission power value in conjunction with other base stations, so that it is possible to reduce labor and cost that have been handled manually.

  In addition, although Example 1 demonstrated the case where the base station apparatus D was newly installed, also when the existing base station apparatus moves, when the base station apparatus is removed due to a failure or the like, the radio parameter list is similarly updated. Thus, the radio parameters of the subordinate base stations can be adjusted. In the case of base station movement, the base station ID is changed in accordance with the installation location of the movement destination. In the case of deletion, the base station ID is deleted, and then the radio frequency and transmission power value are reset.

(Example 2)
In Example 2, a case where the present embodiment is extended to a plurality of floors (three dimensions) will be described. FIG. 13 shows an example of mapping the base station ID and the position where the base station is installed in the three-dimensional space. In Example 1, although the case of plane space was shown, this embodiment is effective with respect to the three-dimensional space, especially the base station installed indoors. This is because it is installed indoors, so it is difficult to acquire position information by GPS (Global Positioning System). This is because the obtained position information cannot be effectively used because it seems that there are several base station apparatuses.

  In FIG. 13, both the first floor and the second floor have the same size and the same shape in a two-story building. In order to include floor information as position information, in the example of FIG. 13, the first three digits of the base station ID represent the position, the first digit is the floor information, the second digit is the east-west information, the third digit. The eyes show information in the north-south direction. For example, since the base station apparatus A is placed in the “B3” area on the first floor, the base station ID is set to “1B3001”. The last three digits are arbitrary, but “001” is given because it is the first base station in the area.

  When the weight of the distance between the areas is considered only for each floor, it is the same as in FIG. 5, but FIG. 13 adds the weight of the distance between 1F and 2F. The weight of the distance when straddling the floor is not simply expressed by the distance, and the weight of the distance may be given according to the material supporting the floor. For example, the distance weight may be reduced in the case of timber that is easily transmitted, and the distance weight may be increased in the case of thick concrete. If the weight of the distance is increased, for example, even if base stations are placed at the same place on the first floor and the second floor, it means that they do not influence (interfere) with each other. In the example of FIG. 13, the weight of the distance between the floors is set to 7. FIG. 14 shows a radio parameter list indicating the radio frequency and transmission power value in this case.

Next, consider a case where a base station apparatus E is newly installed in FIG. Based on the procedure for determining the radio frequency described above, the weight of the distance between the base station apparatus E and the other base station apparatuses is calculated as follows.

  From the above results, the nearest base station is base station B, and the radio frequency used by this base station is β. The next nearest base station is A, and the radio frequency used by this base station is α. From this result, it can be seen that the farthest base station is the base station C, and the radio frequency with the least interference is γ, so the radio frequency of the base station apparatus E is determined by γ.

  In addition, regarding the transmission power value, if it is assumed that when the transmission power value is 40 and the distance weight is separated by √30 or more, it can be guaranteed that they do not interfere with each other, the only base station C that may cause interference is Since the weight of the distance is {square root over (62)}, it can be seen that there is no interference if the transmission power values are operated at least 40 or less. Actually, the transmission power is further narrowed down in consideration of other cover areas and the like.

(Example 3)
In the second embodiment, when the distance between 1F and 2F is considered, the actual weight is considered instead of the distance weight considering the radio wave transmittance. This is effective not only in three dimensions but also in two dimensions. For example, if there is a room surrounded by concrete at a certain corner, it is difficult for radio waves to reach that room. 5 and 6 are examples based on the assumption that there is no obstacle on the two-dimensional plane and that the space is free. By increasing the weight, it is possible to approach the actually received radio wave intensity.

  FIG. 15 illustrates an example of mapping the base station ID and the position where the base station is installed in the third embodiment. The example of FIG. 15 is an example thereof, and when calculating the distance weight including the area “E3”, the distance weight is not calculated as 1, but is calculated as 4. This indicates that it is difficult for radio waves to reach the area E3 ″. In this way, it is possible to set appropriate radio parameters according to the actual radio wave environment.

(Modification)
In the above embodiment, the position information is included in the base station ID. However, the position information can be included in information other than the base station ID, and can be appropriately changed and used according to the system. For example, an IP address set in the base station can be used, and position information can be included as “10.168.1 (floor) .1 (area)”.

  As described above, in this embodiment, information that can be used as a position is given to ID information or the like that needs to be set in the base station apparatus, and the base station ID is set in the management apparatus that centrally manages the base station apparatus. By collecting, the position information of the base station apparatus is grasped, and the radio frequency and the transmission power value can be automatically determined.

  According to the present embodiment, conventionally, it was necessary to manually determine the radio frequency and the transmission power value in consideration of the surrounding radio conditions when the base station was installed. Since it becomes possible to determine the transmission power value in consideration of the radio wave condition transmitted by the user, the labor of the installer can be greatly reduced without adversely affecting the existing service. Further, in the present embodiment, it is not necessary to newly install a reception frequency band in the base station apparatus, and it is effective for a base station apparatus in which such a function is not implemented.

  Although several embodiments have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  1-1 to 1-m... Terminal, 2-1 to 2-n base station, 3 management device, 4 management server, 21 network communication unit, 22 wireless parameter setting unit, 23 wireless unit, 31 Network communication unit 32 Wireless parameter list 33 Wireless parameter allocation unit

Claims (9)

A wireless communication system comprising a plurality of base station devices installed in a management area, and a management device for managing the base station device,
The management device
Means for storing a radio parameter list for storing identification information of a base station apparatus including area information obtained by dividing the management area and radio parameters of the base station apparatus;
Means for assigning the radio parameter according to the distance between base stations based on the identification information of the radio parameter list;
Means for transmitting the assigned radio parameter to the base station device,
The base station device
Means for receiving wireless parameters transmitted from the management device;
A wireless communication system comprising: means for setting the wireless parameter.   The wireless communication system according to claim 1, wherein the distance between the base stations is weighted based on a size of the management area and the number of divided areas.   The radio communication system according to claim 1, wherein the radio parameters include a radio frequency and a transmission power value. A management device that manages a plurality of base station devices installed in a management area,
Means for storing a radio parameter list for storing identification information of a base station apparatus including area information obtained by dividing the management area for each base station apparatus and radio parameters of the base station apparatus;
Means for assigning the radio parameter according to the distance between base stations based on the identification information of the radio parameter list;
Means for transmitting the assigned radio parameters to the base station apparatus.   The management apparatus according to claim 4, wherein the distance between the base stations is weighted based on a size of the management area and the number of divided areas.   The management device according to claim 4 or 5, wherein the radio parameter includes a radio frequency and a transmission power value. A method used in a wireless communication system comprising a plurality of base station devices installed in a management area and a management device that manages the base station device,
The management device
Storing a radio parameter list that stores identification information of a base station apparatus including area information obtained by dividing the management area for each base station apparatus and radio parameters of the base station apparatus;
Assigning the radio parameters according to the distance between base stations based on the identification information of the radio parameter list;
Transmitting the assigned radio parameters to the base station device,
The base station device
Receiving wireless parameters transmitted from the management device;
A base station management method comprising: setting the radio parameter.   The base station management method according to claim 7, wherein the distance between the base stations is weighted based on a size of the management area and the number of divided areas.   The base station management method according to claim 7 or 8, wherein the radio parameters include a radio frequency and a transmission power value.

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